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-rw-r--r--doc/rust.md30
-rw-r--r--mk/tests.mk4
-rw-r--r--src/librustc/back/link.rs23
-rw-r--r--src/librustc/back/rpath.rs117
-rw-r--r--src/librustc/front/std_inject.rs2
-rw-r--r--src/librustc/front/test.rs2
-rw-r--r--src/librustc/metadata/common.rs2
-rw-r--r--src/librustc/metadata/creader.rs45
-rw-r--r--src/librustc/metadata/filesearch.rs143
-rw-r--r--src/librustc/metadata/loader.rs78
-rw-r--r--src/librustc/middle/resolve.rs5
-rw-r--r--src/librustpkg/api.rs24
-rw-r--r--src/librustpkg/context.rs24
-rw-r--r--src/librustpkg/installed_packages.rs42
-rw-r--r--src/librustpkg/package_id.rs76
-rw-r--r--src/librustpkg/package_path.rs68
-rw-r--r--src/librustpkg/package_source.rs59
-rw-r--r--src/librustpkg/path_util.rs137
-rw-r--r--src/librustpkg/rustpkg.rs89
-rw-r--r--src/librustpkg/source_control.rs37
-rw-r--r--src/librustpkg/tests.rs342
-rw-r--r--src/librustpkg/util.rs106
-rw-r--r--src/librustpkg/version.rs32
-rw-r--r--src/librustpkg/workspace.rs8
-rw-r--r--src/libstd/path.rs165
-rw-r--r--src/libsyntax/ast.rs6
-rw-r--r--src/libsyntax/ast_util.rs2
-rw-r--r--src/libsyntax/parse/parser.rs23
-rw-r--r--src/libsyntax/print/pprust.rs6
-rw-r--r--src/test/run-pass/extern-mod-url.rs16
30 files changed, 919 insertions, 794 deletions
diff --git a/doc/rust.md b/doc/rust.md
index 2f5c310ec83..d285253ffe2 100644
--- a/doc/rust.md
+++ b/doc/rust.md
@@ -744,7 +744,7 @@ There are several kinds of view item:
 ##### Extern mod declarations
 
 ~~~~~~~~ {.ebnf .gram}
-extern_mod_decl : "extern" "mod" ident [ '(' link_attrs ')' ] ? ;
+extern_mod_decl : "extern" "mod" ident [ '(' link_attrs ')' ] ? [ '=' string_lit ] ? ;
 link_attrs : link_attr [ ',' link_attrs ] + ;
 link_attr : ident '=' literal ;
 ~~~~~~~~
@@ -755,13 +755,25 @@ as the `ident` provided in the `extern_mod_decl`.
 
 The external crate is resolved to a specific `soname` at compile time,
 and a runtime linkage requirement to that `soname` is passed to the linker for
-loading at runtime. The `soname` is resolved at compile time by scanning the
-compiler's library path and matching the `link_attrs` provided in the
-`use_decl` against any `#link` attributes that were declared on the external
-crate when it was compiled. If no `link_attrs` are provided, a default `name`
-attribute is assumed, equal to the `ident` given in the `use_decl`.
-
-Three examples of `extern mod` declarations:
+loading at runtime.
+The `soname` is resolved at compile time by scanning the compiler's library path
+and matching the `link_attrs` provided in the `use_decl` against any `#link` attributes that
+were declared on the external crate when it was compiled.
+If no `link_attrs` are provided,
+a default `name` attribute is assumed,
+equal to the `ident` given in the `use_decl`.
+
+Optionally, an identifier in an `extern mod` declaration may be followed by an equals sign,
+then a string literal denoting a relative path on the filesystem.
+This path should exist in one of the directories in the Rust path,
+which by default contains the `.rust` subdirectory of the current directory and each of its parents,
+as well as any directories in the colon-separated (or semicolon-separated on Windows)
+list of paths that is the `RUST_PATH` environment variable.
+The meaning of `extern mod a = "b/c/d";`, supposing that `/a` is in the RUST_PATH,
+is that the name `a` should be taken as a reference to the crate whose absolute location is
+`/a/b/c/d`.
+
+Four examples of `extern mod` declarations:
 
 ~~~~~~~~{.xfail-test}
 extern mod pcre (uuid = "54aba0f8-a7b1-4beb-92f1-4cf625264841");
@@ -769,6 +781,8 @@ extern mod pcre (uuid = "54aba0f8-a7b1-4beb-92f1-4cf625264841");
 extern mod extra; // equivalent to: extern mod extra ( name = "extra" );
 
 extern mod rustextra (name = "extra"); // linking to 'extra' under another name
+
+extern mod complicated_mod = "some-file/in/the-rust/path";
 ~~~~~~~~
 
 ##### Use declarations
diff --git a/mk/tests.mk b/mk/tests.mk
index 8e921d300b5..349ffc63d97 100644
--- a/mk/tests.mk
+++ b/mk/tests.mk
@@ -348,7 +348,9 @@ $(3)/stage$(1)/test/rustpkgtest-$(2)$$(X_$(2)):					\
 		$$(RUSTPKG_LIB) $$(RUSTPKG_INPUTS)		\
 		$$(SREQ$(1)_T_$(2)_H_$(3)) \
 		$$(TLIB$(1)_T_$(2)_H_$(3))/$$(CFG_LIBSYNTAX_$(2)) \
-		$$(TLIB$(1)_T_$(2)_H_$(3))/$$(CFG_LIBRUSTC_$(2))
+		$$(TLIB$(1)_T_$(2)_H_$(3))/$$(CFG_LIBRUSTC_$(2)) \
+		$$(TBIN$(1)_T_$(2)_H_$(3))/rustpkg$$(X_$(2)) \
+		$$(TBIN$(1)_T_$(2)_H_$(3))/rustc$$(X_$(2))
 	@$$(call E, compile_and_link: $$@)
 	$$(STAGE$(1)_T_$(2)_H_$(3)) -o $$@ $$< --test
 
diff --git a/src/librustc/back/link.rs b/src/librustc/back/link.rs
index 637ea159d79..bd95f1b735b 100644
--- a/src/librustc/back/link.rs
+++ b/src/librustc/back/link.rs
@@ -16,7 +16,7 @@ use lib::llvm::llvm;
 use lib::llvm::ModuleRef;
 use lib;
 use metadata::common::LinkMeta;
-use metadata::{encoder, csearch, cstore};
+use metadata::{encoder, csearch, cstore, filesearch};
 use middle::trans::context::CrateContext;
 use middle::trans::common::gensym_name;
 use middle::ty;
@@ -497,6 +497,7 @@ pub fn build_link_meta(sess: Session,
     struct ProvidedMetas {
         name: Option<@str>,
         vers: Option<@str>,
+        pkg_id: Option<@str>,
         cmh_items: ~[@ast::MetaItem]
     }
 
@@ -504,6 +505,7 @@ pub fn build_link_meta(sess: Session,
        ProvidedMetas {
         let mut name = None;
         let mut vers = None;
+        let mut pkg_id = None;
         let mut cmh_items = ~[];
         let linkage_metas = attr::find_linkage_metas(c.attrs);
         attr::require_unique_names(sess.diagnostic(), linkage_metas);
@@ -511,6 +513,7 @@ pub fn build_link_meta(sess: Session,
             match meta.name_str_pair() {
                 Some((n, value)) if "name" == n => name = Some(value),
                 Some((n, value)) if "vers" == n => vers = Some(value),
+                Some((n, value)) if "package_id" == n => pkg_id = Some(value),
                 _ => cmh_items.push(*meta)
             }
         }
@@ -518,6 +521,7 @@ pub fn build_link_meta(sess: Session,
         ProvidedMetas {
             name: name,
             vers: vers,
+            pkg_id: pkg_id,
             cmh_items: cmh_items
         }
     }
@@ -525,7 +529,8 @@ pub fn build_link_meta(sess: Session,
     // This calculates CMH as defined above
     fn crate_meta_extras_hash(symbol_hasher: &mut hash::State,
                               cmh_items: ~[@ast::MetaItem],
-                              dep_hashes: ~[@str]) -> @str {
+                              dep_hashes: ~[@str],
+                              pkg_id: Option<@str>) -> @str {
         fn len_and_str(s: &str) -> ~str {
             fmt!("%u_%s", s.len(), s)
         }
@@ -563,7 +568,10 @@ pub fn build_link_meta(sess: Session,
             write_string(symbol_hasher, len_and_str(*dh));
         }
 
-    // tjc: allocation is unfortunate; need to change std::hash
+        for p in pkg_id.iter() {
+            write_string(symbol_hasher, len_and_str(*p));
+        }
+
         return truncated_hash_result(symbol_hasher).to_managed();
     }
 
@@ -605,6 +613,7 @@ pub fn build_link_meta(sess: Session,
     let ProvidedMetas {
         name: opt_name,
         vers: opt_vers,
+        pkg_id: opt_pkg_id,
         cmh_items: cmh_items
     } = provided_link_metas(sess, c);
     let name = crate_meta_name(sess, output, opt_name);
@@ -612,11 +621,12 @@ pub fn build_link_meta(sess: Session,
     let dep_hashes = cstore::get_dep_hashes(sess.cstore);
     let extras_hash =
         crate_meta_extras_hash(symbol_hasher, cmh_items,
-                               dep_hashes);
+                               dep_hashes, opt_pkg_id);
 
     LinkMeta {
         name: name,
         vers: vers,
+        package_id: opt_pkg_id,
         extras_hash: extras_hash
     }
 }
@@ -939,6 +949,11 @@ pub fn link_args(sess: Session,
         args.push(~"-L" + path.to_str());
     }
 
+    let rustpath = filesearch::rust_path();
+    for path in rustpath.iter() {
+        args.push(~"-L" + path.to_str());
+    }
+
     // The names of the extern libraries
     let used_libs = cstore::get_used_libraries(cstore);
     for l in used_libs.iter() { args.push(~"-l" + *l); }
diff --git a/src/librustc/back/rpath.rs b/src/librustc/back/rpath.rs
index 6aac627729c..5dc92dbc5e6 100644
--- a/src/librustc/back/rpath.rs
+++ b/src/librustc/back/rpath.rs
@@ -14,10 +14,7 @@ use metadata::cstore;
 use metadata::filesearch;
 
 use std::hashmap::HashSet;
-use std::num;
-use std::os;
-use std::util;
-use std::vec;
+use std::{num, os, path, uint, util, vec};
 
 fn not_win32(os: session::os) -> bool {
   os != session::os_win32
@@ -122,42 +119,7 @@ pub fn get_rpath_relative_to_output(os: session::os,
         session::os_win32 => util::unreachable()
     };
 
-    Path(prefix).push_rel(&get_relative_to(&os::make_absolute(output),
-                                           &os::make_absolute(lib)))
-}
-
-// Find the relative path from one file to another
-pub fn get_relative_to(abs1: &Path, abs2: &Path) -> Path {
-    assert!(abs1.is_absolute);
-    assert!(abs2.is_absolute);
-    let abs1 = abs1.normalize();
-    let abs2 = abs2.normalize();
-    debug!("finding relative path from %s to %s",
-           abs1.to_str(), abs2.to_str());
-    let split1: &[~str] = abs1.components;
-    let split2: &[~str] = abs2.components;
-    let len1 = split1.len();
-    let len2 = split2.len();
-    assert!(len1 > 0);
-    assert!(len2 > 0);
-
-    let max_common_path = num::min(len1, len2) - 1;
-    let mut start_idx = 0;
-    while start_idx < max_common_path
-        && split1[start_idx] == split2[start_idx] {
-        start_idx += 1;
-    }
-
-    let mut path = ~[];
-    for _ in range(start_idx, len1 - 1) { path.push(~".."); };
-
-    path.push_all(split2.slice(start_idx, len2 - 1));
-
-    return if !path.is_empty() {
-        Path("").push_many(path)
-    } else {
-        Path(".")
-    }
+    Path(prefix).push_rel(&os::make_absolute(output).get_relative_to(&os::make_absolute(lib)))
 }
 
 fn get_absolute_rpaths(libs: &[Path]) -> ~[Path] {
@@ -208,8 +170,7 @@ mod test {
     #[cfg(test)]
     #[cfg(test)]
     use back::rpath::{get_absolute_rpath, get_install_prefix_rpath};
-    use back::rpath::{get_relative_to, get_rpath_relative_to_output};
-    use back::rpath::{minimize_rpaths, rpaths_to_flags};
+    use back::rpath::{minimize_rpaths, rpaths_to_flags, get_rpath_relative_to_output};
     use driver::session;
 
     #[test]
@@ -254,77 +215,8 @@ mod test {
     }
 
     #[test]
-    fn test_relative_to1() {
-        let p1 = Path("/usr/bin/rustc");
-        let p2 = Path("/usr/lib/mylib");
-        let res = get_relative_to(&p1, &p2);
-        assert_eq!(res, Path("../lib"));
-    }
-
-    #[test]
-    fn test_relative_to2() {
-        let p1 = Path("/usr/bin/rustc");
-        let p2 = Path("/usr/bin/../lib/mylib");
-        let res = get_relative_to(&p1, &p2);
-        assert_eq!(res, Path("../lib"));
-    }
-
-    #[test]
-    fn test_relative_to3() {
-        let p1 = Path("/usr/bin/whatever/rustc");
-        let p2 = Path("/usr/lib/whatever/mylib");
-        let res = get_relative_to(&p1, &p2);
-        assert_eq!(res, Path("../../lib/whatever"));
-    }
-
-    #[test]
-    fn test_relative_to4() {
-        let p1 = Path("/usr/bin/whatever/../rustc");
-        let p2 = Path("/usr/lib/whatever/mylib");
-        let res = get_relative_to(&p1, &p2);
-        assert_eq!(res, Path("../lib/whatever"));
-    }
-
-    #[test]
-    fn test_relative_to5() {
-        let p1 = Path("/usr/bin/whatever/../rustc");
-        let p2 = Path("/usr/lib/whatever/../mylib");
-        let res = get_relative_to(&p1, &p2);
-        assert_eq!(res, Path("../lib"));
-    }
-
-    #[test]
-    fn test_relative_to6() {
-        let p1 = Path("/1");
-        let p2 = Path("/2/3");
-        let res = get_relative_to(&p1, &p2);
-        assert_eq!(res, Path("2"));
-    }
-
-    #[test]
-    fn test_relative_to7() {
-        let p1 = Path("/1/2");
-        let p2 = Path("/3");
-        let res = get_relative_to(&p1, &p2);
-        assert_eq!(res, Path(".."));
-    }
-
-    #[test]
-    fn test_relative_to8() {
-        let p1 = Path("/home/brian/Dev/rust/build/").push_rel(
-            &Path("stage2/lib/rustc/i686-unknown-linux-gnu/lib/librustc.so"));
-        let p2 = Path("/home/brian/Dev/rust/build/stage2/bin/..").push_rel(
-            &Path("lib/rustc/i686-unknown-linux-gnu/lib/libstd.so"));
-        let res = get_relative_to(&p1, &p2);
-        debug!("test_relative_tu8: %s vs. %s",
-               res.to_str(),
-               Path(".").to_str());
-        assert_eq!(res, Path("."));
-    }
-
-    #[test]
     #[cfg(target_os = "linux")]
-    #[cfg(target_os = "andorid")]
+    #[cfg(target_os = "android")]
     fn test_rpath_relative() {
       let o = session::os_linux;
       let res = get_rpath_relative_to_output(o,
@@ -344,7 +236,6 @@ mod test {
     #[test]
     #[cfg(target_os = "macos")]
     fn test_rpath_relative() {
-        // this is why refinements would be nice
         let o = session::os_macos;
         let res = get_rpath_relative_to_output(o,
                                                &Path("bin/rustc"),
diff --git a/src/librustc/front/std_inject.rs b/src/librustc/front/std_inject.rs
index 3a1129b1dd9..2a61ea28e0c 100644
--- a/src/librustc/front/std_inject.rs
+++ b/src/librustc/front/std_inject.rs
@@ -47,7 +47,7 @@ fn inject_libstd_ref(sess: Session, crate: &ast::Crate) -> @ast::Crate {
             let n1 = sess.next_node_id();
             let vi1 = ast::view_item {
                 node: ast::view_item_extern_mod(
-                        sess.ident_of("std"), ~[], n1),
+                        sess.ident_of("std"), None, ~[], n1),
                 attrs: ~[
                     attr::mk_attr(
                         attr::mk_name_value_item_str(@"vers", STD_VERSION.to_managed()))
diff --git a/src/librustc/front/test.rs b/src/librustc/front/test.rs
index d2d2a8b4be9..c6b1bdbe51b 100644
--- a/src/librustc/front/test.rs
+++ b/src/librustc/front/test.rs
@@ -282,7 +282,7 @@ fn mk_std(cx: &TestCtxt) -> ast::view_item {
                                             cx.sess.next_node_id()))])
     } else {
         let mi = attr::mk_name_value_item_str(@"vers", @"0.8-pre");
-        ast::view_item_extern_mod(id_extra, ~[mi], cx.sess.next_node_id())
+        ast::view_item_extern_mod(id_extra, None, ~[mi], cx.sess.next_node_id())
     };
     ast::view_item {
         node: vi,
diff --git a/src/librustc/metadata/common.rs b/src/librustc/metadata/common.rs
index 1c5d202d4d9..f2d8b68faa6 100644
--- a/src/librustc/metadata/common.rs
+++ b/src/librustc/metadata/common.rs
@@ -185,5 +185,7 @@ pub static tag_item_impl_vtables: uint = 0x82;
 pub struct LinkMeta {
     name: @str,
     vers: @str,
+    // Optional package ID
+    package_id: Option<@str>, // non-None if this was a URL-like package ID
     extras_hash: @str
 }
diff --git a/src/librustc/metadata/creader.rs b/src/librustc/metadata/creader.rs
index d8f14228824..0a9e8490f22 100644
--- a/src/librustc/metadata/creader.rs
+++ b/src/librustc/metadata/creader.rs
@@ -18,6 +18,7 @@ use metadata::loader;
 
 use std::hashmap::HashMap;
 use syntax::ast;
+use std::vec;
 use syntax::attr;
 use syntax::attr::AttrMetaMethods;
 use syntax::codemap::{span, dummy_sp};
@@ -137,18 +138,33 @@ fn visit_crate(e: &Env, c: &ast::Crate) {
 
 fn visit_view_item(e: @mut Env, i: &ast::view_item) {
     match i.node {
-      ast::view_item_extern_mod(ident, ref meta_items, id) => {
-        debug!("resolving extern mod stmt. ident: %?, meta: %?",
-               ident, *meta_items);
-        let cnum = resolve_crate(e,
-                                 ident,
-                                 (*meta_items).clone(),
-                                 @"",
-                                 i.span);
-        cstore::add_extern_mod_stmt_cnum(e.cstore, id, cnum);
+      ast::view_item_extern_mod(ident, path_opt, ref meta_items, id) => {
+          let ident = token::ident_to_str(&ident);
+          let meta_items = match path_opt {
+              None => meta_items.clone(),
+              Some(p) => {
+                  let p_path = Path(p);
+                  match p_path.filestem() {
+                      Some(s) =>
+                          vec::append(
+                              ~[attr::mk_name_value_item_str(@"package_id", p),
+                               attr::mk_name_value_item_str(@"name", s.to_managed())],
+                              *meta_items),
+                      None => e.diag.span_bug(i.span, "Bad package path in `extern mod` item")
+                  }
+            }
+          };
+          debug!("resolving extern mod stmt. ident: %?, meta: %?",
+                 ident, meta_items);
+          let cnum = resolve_crate(e,
+                                   ident,
+                                   meta_items,
+                                   @"",
+                                   i.span);
+          cstore::add_extern_mod_stmt_cnum(e.cstore, id, cnum);
       }
       _ => ()
-    }
+  }
 }
 
 fn visit_item(e: &Env, i: @ast::item) {
@@ -233,12 +249,12 @@ fn existing_match(e: &Env, metas: &[@ast::MetaItem], hash: &str)
 }
 
 fn resolve_crate(e: @mut Env,
-                 ident: ast::ident,
+                 ident: @str,
                  metas: ~[@ast::MetaItem],
                  hash: @str,
                  span: span)
               -> ast::CrateNum {
-    let metas = metas_with_ident(token::ident_to_str(&ident), metas);
+    let metas = metas_with_ident(ident, metas);
 
     match existing_match(e, metas, hash) {
       None => {
@@ -279,7 +295,7 @@ fn resolve_crate(e: @mut Env,
             match attr::last_meta_item_value_str_by_name(load_ctxt.metas,
                                                          "name") {
                 Some(v) => v,
-                None => token::ident_to_str(&ident),
+                None => ident
             };
         let cmeta = @cstore::crate_metadata {
             name: cname,
@@ -308,7 +324,6 @@ fn resolve_crate_deps(e: @mut Env, cdata: @~[u8]) -> cstore::cnum_map {
     let r = decoder::get_crate_deps(cdata);
     for dep in r.iter() {
         let extrn_cnum = dep.cnum;
-        let cname = dep.name;
         let cname_str = token::ident_to_str(&dep.name);
         let cmetas = metas_with(dep.vers, @"vers", ~[]);
         debug!("resolving dep crate %s ver: %s hash: %s",
@@ -327,7 +342,7 @@ fn resolve_crate_deps(e: @mut Env, cdata: @~[u8]) -> cstore::cnum_map {
             // FIXME (#2404): Need better error reporting than just a bogus
             // span.
             let fake_span = dummy_sp();
-            let local_cnum = resolve_crate(e, cname, cmetas, dep.hash,
+            let local_cnum = resolve_crate(e, cname_str, cmetas, dep.hash,
                                            fake_span);
             cnum_map.insert(extrn_cnum, local_cnum);
           }
diff --git a/src/librustc/metadata/filesearch.rs b/src/librustc/metadata/filesearch.rs
index e18879464e8..2b44d793a9d 100644
--- a/src/librustc/metadata/filesearch.rs
+++ b/src/librustc/metadata/filesearch.rs
@@ -11,12 +11,15 @@
 
 use std::option;
 use std::os;
-use std::result;
+use std::{result, str};
+use std::hashmap::HashSet;
 
 // A module for searching for libraries
 // FIXME (#2658): I'm not happy how this module turned out. Should
 // probably just be folded into cstore.
 
+/// Functions with type `pick` take a parent directory as well as
+/// a file found in that directory.
 pub type pick<'self, T> = &'self fn(path: &Path) -> Option<T>;
 
 pub fn pick_file(file: Path, path: &Path) -> Option<Path> {
@@ -46,28 +49,33 @@ pub fn mk_filesearch(maybe_sysroot: &Option<@Path>,
     impl FileSearch for FileSearchImpl {
         fn sysroot(&self) -> @Path { self.sysroot }
         fn for_each_lib_search_path(&self, f: &fn(&Path) -> bool) -> bool {
+            let mut visited_dirs = HashSet::new();
+
             debug!("filesearch: searching additional lib search paths [%?]",
                    self.addl_lib_search_paths.len());
-            // a little weird
-            self.addl_lib_search_paths.iter().advance(|path| f(path));
+            for path in self.addl_lib_search_paths.iter() {
+                f(path);
+                visited_dirs.insert(path.to_str());
+            }
 
             debug!("filesearch: searching target lib path");
-            if !f(&make_target_lib_path(self.sysroot,
-                                        self.target_triple)) {
-                return false;
-            }
-            debug!("filesearch: searching rustpkg lib path nearest");
-            if match get_rustpkg_lib_path_nearest() {
-                    result::Ok(ref p) => f(p),
-                    result::Err(_) => true
-                } {
-                    return true;
+            let tlib_path = make_target_lib_path(self.sysroot,
+                                        self.target_triple);
+            if !visited_dirs.contains(&tlib_path.to_str()) {
+                if !f(&tlib_path) {
+                    return false;
                 }
-           debug!("filesearch: searching rustpkg lib path");
-           match get_rustpkg_lib_path() {
-              result::Ok(ref p) => f(p),
-              result::Err(_) => true
-           }
+            }
+            visited_dirs.insert(tlib_path.to_str());
+            // Try RUST_PATH
+            let rustpath = rust_path();
+            for path in rustpath.iter() {
+                    if !visited_dirs.contains(&path.push("lib").to_str()) {
+                        f(&path.push("lib"));
+                        visited_dirs.insert(path.push("lib").to_str());
+                    }
+            }
+            true
         }
         fn get_target_lib_path(&self) -> Path {
             make_target_lib_path(self.sysroot, self.target_triple)
@@ -94,12 +102,15 @@ pub fn search<T>(filesearch: @FileSearch, pick: pick<T>) -> Option<T> {
         for path in r.iter() {
             debug!("testing %s", path.to_str());
             let maybe_picked = pick(path);
-            if maybe_picked.is_some() {
-                debug!("picked %s", path.to_str());
-                rslt = maybe_picked;
-                break;
-            } else {
-                debug!("rejected %s", path.to_str());
+            match maybe_picked {
+                Some(_) => {
+                    debug!("picked %s", path.to_str());
+                    rslt = maybe_picked;
+                    break;
+                }
+                None => {
+                    debug!("rejected %s", path.to_str());
+                }
             }
         }
         rslt.is_none()
@@ -132,55 +143,59 @@ fn get_sysroot(maybe_sysroot: &Option<@Path>) -> @Path {
     }
 }
 
-pub fn get_rustpkg_sysroot() -> Result<Path, ~str> {
-    result::Ok(get_or_default_sysroot().push_many([libdir(), ~"rustpkg"]))
+#[cfg(windows)]
+static PATH_ENTRY_SEPARATOR: &'static str = ";";
+#[cfg(not(windows))]
+static PATH_ENTRY_SEPARATOR: &'static str = ":";
+
+/// Returns RUST_PATH as a string, without default paths added
+pub fn get_rust_path() -> Option<~str> {
+    os::getenv("RUST_PATH")
 }
 
-pub fn get_rustpkg_root() -> Result<Path, ~str> {
-    match os::getenv("RUSTPKG_ROOT") {
-        Some(ref _p) => result::Ok(Path((*_p))),
-        None => match os::homedir() {
-          Some(ref _q) => result::Ok((*_q).push(".rustpkg")),
-          None => result::Err(~"no RUSTPKG_ROOT or home directory")
+/// Returns the value of RUST_PATH, as a list
+/// of Paths. Includes default entries for, if they exist:
+/// $HOME/.rust
+/// DIR/.rust for any DIR that's the current working directory
+/// or an ancestor of it
+pub fn rust_path() -> ~[Path] {
+    let mut env_rust_path: ~[Path] = match get_rust_path() {
+        Some(env_path) => {
+            let env_path_components: ~[&str] =
+                env_path.split_str_iter(PATH_ENTRY_SEPARATOR).collect();
+            env_path_components.map(|&s| Path(s))
         }
+        None => ~[]
+    };
+    let cwd = os::getcwd();
+    // now add in default entries
+    let cwd_dot_rust = cwd.push(".rust");
+    if !env_rust_path.contains(&cwd_dot_rust) {
+        env_rust_path.push(cwd_dot_rust);
     }
-}
-
-pub fn get_rustpkg_root_nearest() -> Result<Path, ~str> {
-    do get_rustpkg_root().chain |p| {
-        let cwd = os::getcwd();
-        let cwd_rustpkg = cwd.push(".rustpkg");
-        let rustpkg_is_non_root_file =
-            !os::path_is_dir(&cwd_rustpkg) && cwd_rustpkg != p;
-        let mut par_rustpkg = cwd.pop().push(".rustpkg");
-        let mut rslt = result::Ok(cwd_rustpkg);
-
-        if rustpkg_is_non_root_file {
-            while par_rustpkg != p {
-                if os::path_is_dir(&par_rustpkg) {
-                    rslt = result::Ok(par_rustpkg);
-                    break;
-                }
-                if par_rustpkg.components.len() == 1 {
-                    // We just checked /.rustpkg, stop now.
-                    break;
-                }
-                par_rustpkg = par_rustpkg.pop().pop().push(".rustpkg");
-            }
+    if !env_rust_path.contains(&cwd) {
+        env_rust_path.push(cwd.clone());
+    }
+    do cwd.each_parent() |p| {
+        if !env_rust_path.contains(&p.push(".rust")) {
+            push_if_exists(&mut env_rust_path, p);
         }
-        rslt
     }
-}
-
-fn get_rustpkg_lib_path() -> Result<Path, ~str> {
-    do get_rustpkg_root().chain |p| {
-        result::Ok(p.push(libdir()))
+    let h = os::homedir();
+    for h in h.iter() {
+        if !env_rust_path.contains(&h.push(".rust")) {
+            push_if_exists(&mut env_rust_path, h);
+        }
     }
+    env_rust_path
 }
 
-fn get_rustpkg_lib_path_nearest() -> Result<Path, ~str> {
-    do get_rustpkg_root_nearest().chain |p| {
-        result::Ok(p.push(libdir()))
+
+/// Adds p/.rust into vec, only if it exists
+fn push_if_exists(vec: &mut ~[Path], p: &Path) {
+    let maybe_dir = p.push(".rust");
+    if os::path_exists(&maybe_dir) {
+        vec.push(maybe_dir);
     }
 }
 
diff --git a/src/librustc/metadata/loader.rs b/src/librustc/metadata/loader.rs
index 9330cfc5c88..5f145d87ca8 100644
--- a/src/librustc/metadata/loader.rs
+++ b/src/librustc/metadata/loader.rs
@@ -18,7 +18,6 @@ use metadata::filesearch::FileSearch;
 use metadata::filesearch;
 use syntax::codemap::span;
 use syntax::diagnostic::span_handler;
-use syntax::parse::token;
 use syntax::parse::token::ident_interner;
 use syntax::print::pprust;
 use syntax::{ast, attr};
@@ -46,7 +45,7 @@ pub struct Context {
     diag: @span_handler,
     filesearch: @FileSearch,
     span: span,
-    ident: ast::ident,
+    ident: @str,
     metas: ~[@ast::MetaItem],
     hash: @str,
     os: os,
@@ -60,7 +59,7 @@ pub fn load_library_crate(cx: &Context) -> (~str, @~[u8]) {
       None => {
         cx.diag.span_fatal(cx.span,
                            fmt!("can't find crate for `%s`",
-                                token::ident_to_str(&cx.ident)));
+                                cx.ident));
       }
     }
 }
@@ -89,37 +88,38 @@ fn find_library_crate_aux(
     filesearch: @filesearch::FileSearch
 ) -> Option<(~str, @~[u8])> {
     let crate_name = crate_name_from_metas(cx.metas);
-    let prefix = prefix + crate_name + "-";
-
+    // want: crate_name.dir_part() + prefix + crate_name.file_part + "-"
+    let prefix = fmt!("%s%s-", prefix, crate_name);
     let mut matches = ~[];
     filesearch::search(filesearch, |path| -> Option<()> {
-        debug!("inspecting file %s", path.to_str());
-        match path.filename() {
-            Some(ref f) if f.starts_with(prefix) && f.ends_with(suffix) => {
-                debug!("%s is a candidate", path.to_str());
-                match get_metadata_section(cx.os, path) {
-                    Some(cvec) =>
-                        if !crate_matches(cvec, cx.metas, cx.hash) {
-                            debug!("skipping %s, metadata doesn't match",
-                                   path.to_str());
-                            None
-                        } else {
-                            debug!("found %s with matching metadata", path.to_str());
-                            matches.push((path.to_str(), cvec));
-                            None
-                        },
-                    _ => {
-                        debug!("could not load metadata for %s", path.to_str());
-                        None
-                    }
-                }
-            }
-            _ => {
-                debug!("skipping %s, doesn't look like %s*%s", path.to_str(),
-                       prefix, suffix);
-                None
-            }
-        }});
+      let path_str = path.filename();
+      match path_str {
+          None => None,
+          Some(path_str) =>
+              if path_str.starts_with(prefix) && path_str.ends_with(suffix) {
+                  debug!("%s is a candidate", path.to_str());
+                  match get_metadata_section(cx.os, path) {
+                      Some(cvec) =>
+                          if !crate_matches(cvec, cx.metas, cx.hash) {
+                              debug!("skipping %s, metadata doesn't match",
+                                  path.to_str());
+                              None
+                          } else {
+                              debug!("found %s with matching metadata", path.to_str());
+                              matches.push((path.to_str(), cvec));
+                              None
+                          },
+                      _ => {
+                          debug!("could not load metadata for %s", path.to_str());
+                          None
+                      }
+                  }
+               }
+               else {
+                   None
+               }
+      }
+    });
 
     match matches.len() {
         0 => None,
@@ -137,8 +137,8 @@ fn find_library_crate_aux(
                 }
                 cx.diag.handler().abort_if_errors();
                 None
-            }
         }
+    }
 }
 
 pub fn crate_name_from_metas(metas: &[@ast::MetaItem]) -> @str {
@@ -151,6 +151,16 @@ pub fn crate_name_from_metas(metas: &[@ast::MetaItem]) -> @str {
     fail!("expected to find the crate name")
 }
 
+pub fn package_id_from_metas(metas: &[@ast::MetaItem]) -> Option<@str> {
+    for m in metas.iter() {
+        match m.name_str_pair() {
+            Some((name, s)) if "package_id" == name => { return Some(s); }
+            _ => {}
+        }
+    }
+    None
+}
+
 pub fn note_linkage_attrs(intr: @ident_interner,
                           diag: @span_handler,
                           attrs: ~[ast::Attribute]) {
@@ -175,6 +185,8 @@ fn crate_matches(crate_data: @~[u8],
 pub fn metadata_matches(extern_metas: &[@ast::MetaItem],
                         local_metas: &[@ast::MetaItem]) -> bool {
 
+// extern_metas: metas we read from the crate
+// local_metas: metas we're looking for
     debug!("matching %u metadata requirements against %u items",
            local_metas.len(), extern_metas.len());
 
diff --git a/src/librustc/middle/resolve.rs b/src/librustc/middle/resolve.rs
index 43953a50e15..7d892d97676 100644
--- a/src/librustc/middle/resolve.rs
+++ b/src/librustc/middle/resolve.rs
@@ -1487,9 +1487,10 @@ impl Resolver {
                 }
             }
 
-            view_item_extern_mod(name, _, node_id) => {
+            view_item_extern_mod(name, _, _, node_id) => {
+                // n.b. we don't need to look at the path option here, because cstore already did
                 match find_extern_mod_stmt_cnum(self.session.cstore,
-                                                node_id) {
+                                                        node_id) {
                     Some(crate_id) => {
                         let def_id = def_id { crate: crate_id, node: 0 };
                         let parent_link = ModuleParentLink
diff --git a/src/librustpkg/api.rs b/src/librustpkg/api.rs
index bcda135cbb6..2da66baa412 100644
--- a/src/librustpkg/api.rs
+++ b/src/librustpkg/api.rs
@@ -23,33 +23,30 @@ fn default_ctxt(p: @Path) -> Ctx {
     Ctx { sysroot_opt: Some(p), json: false, dep_cache: @mut HashMap::new() }
 }
 
-pub fn build_lib(sysroot: @Path, root: Path, dest: Path, name: ~str, version: Version,
+pub fn build_lib(sysroot: @Path, root: Path, name: ~str, version: Version,
                  lib: Path) {
 
     let pkg_src = PkgSrc {
         root: root,
-        dst_dir: dest.clone(),
-        id: PkgId{ version: version, ..PkgId::new(name, &dest.pop())},
+        id: PkgId{ version: version, ..PkgId::new(name)},
         libs: ~[mk_crate(lib)],
         mains: ~[],
         tests: ~[],
         benchs: ~[]
     };
-    pkg_src.build(&default_ctxt(sysroot), pkg_src.dst_dir, ~[]);
+    pkg_src.build(&default_ctxt(sysroot), ~[]);
 }
 
-pub fn build_exe(sysroot: @Path, root: Path, dest: Path, name: ~str, version: Version,
-                 main: Path) {
+pub fn build_exe(sysroot: @Path, root: Path, name: ~str, version: Version, main: Path) {
     let pkg_src = PkgSrc {
         root: root,
-        dst_dir: dest.clone(),
-        id: PkgId{ version: version, ..PkgId::new(name, &dest.pop())},
+        id: PkgId{ version: version, ..PkgId::new(name)},
         libs: ~[],
         mains: ~[mk_crate(main)],
         tests: ~[],
         benchs: ~[]
     };
-    pkg_src.build(&default_ctxt(sysroot), pkg_src.dst_dir, ~[]);
+    pkg_src.build(&default_ctxt(sysroot), ~[]);
 
 }
 
@@ -62,12 +59,9 @@ pub fn install_lib(sysroot: @Path,
     debug!("sysroot = %s", sysroot.to_str());
     debug!("workspace = %s", workspace.to_str());
     // make a PkgSrc
-    let pkg_id = PkgId{ version: version, ..PkgId::new(name, &workspace)};
-    let build_dir = workspace.push("build");
-    let dst_dir = build_dir.push_rel(&*pkg_id.local_path);
+    let pkg_id = PkgId{ version: version, ..PkgId::new(name)};
     let pkg_src = PkgSrc {
         root: workspace.clone(),
-        dst_dir: dst_dir.clone(),
         id: pkg_id.clone(),
         libs: ~[mk_crate(lib_path)],
         mains: ~[],
@@ -75,13 +69,13 @@ pub fn install_lib(sysroot: @Path,
         benchs: ~[]
     };
     let cx = default_ctxt(sysroot);
-    pkg_src.build(&cx, dst_dir, ~[]);
+    pkg_src.build(&cx, ~[]);
     cx.install_no_build(&workspace, &pkg_id);
 }
 
 pub fn install_exe(sysroot: @Path, workspace: Path, name: ~str, version: Version) {
     default_ctxt(sysroot).install(&workspace, &PkgId{ version: version,
-                                            ..PkgId::new(name, &workspace)});
+                                            ..PkgId::new(name)});
 
 }
 
diff --git a/src/librustpkg/context.rs b/src/librustpkg/context.rs
index 230a0f915ac..f051be25f26 100644
--- a/src/librustpkg/context.rs
+++ b/src/librustpkg/context.rs
@@ -12,6 +12,7 @@
 
 
 use std::hashmap::HashMap;
+use std::os;
 
 pub struct Ctx {
     // Sysroot -- if this is None, uses rustc filesearch's
@@ -23,3 +24,26 @@ pub struct Ctx {
     // though I'm not sure why the value is a bool
     dep_cache: @mut HashMap<~str, bool>,
 }
+
+impl Ctx {
+    /// Debugging
+    pub fn sysroot_opt_str(&self) -> ~str {
+        match self.sysroot_opt {
+            None => ~"[none]",
+            Some(p) => p.to_str()
+        }
+    }
+}
+
+/// We assume that if ../../rustc exists, then we're running
+/// rustpkg from a Rust target directory. This is part of a
+/// kludgy hack used to adjust the sysroot.
+pub fn in_target(sysroot_opt: Option<@Path>) -> bool {
+    match sysroot_opt {
+        None => false,
+        Some(p) => {
+            debug!("Checking whether %s is in target", p.to_str());
+            os::path_is_dir(&p.pop().pop().push("rustc"))
+        }
+    }
+}
diff --git a/src/librustpkg/installed_packages.rs b/src/librustpkg/installed_packages.rs
index cec64f36947..7c3cde65517 100644
--- a/src/librustpkg/installed_packages.rs
+++ b/src/librustpkg/installed_packages.rs
@@ -10,6 +10,7 @@
 
 // Listing installed packages
 
+use rustc::metadata::filesearch::rust_path;
 use path_util::*;
 use std::os;
 
@@ -20,21 +21,46 @@ pub fn list_installed_packages(f: &fn(&PkgId) -> bool) -> bool  {
         for exec in binfiles.iter() {
             let exec_path = Path(*exec).filestem();
             do exec_path.iter().advance |s| {
-                f(&PkgId::new(*s, p))
+                f(&PkgId::new(*s))
             };
         }
         let libfiles = os::list_dir(&p.push("lib"));
         for lib in libfiles.iter() {
-            debug!("Full name: %s", *lib);
-            let lib_path = Path(*lib).filestem();
-            do lib_path.iter().advance |s| {
-                f(&PkgId::new(*s, p))
-            };
-        }
+            let lib = Path(*lib);
+            debug!("Full name: %s", lib.to_str());
+            match has_library(&lib) {
+                Some(basename) => {
+                    debug!("parent = %s, child = %s",
+                           p.push("lib").to_str(), lib.to_str());
+                    let rel_p = p.push("lib/").get_relative_to(&lib);
+                    debug!("Rel: %s", rel_p.to_str());
+                    let rel_path = rel_p.push(basename).to_str();
+                    debug!("Rel name: %s", rel_path);
+                    f(&PkgId::new(rel_path));
+                }
+                None => ()
+            }
+        };
     }
     true
 }
 
+pub fn has_library(p: &Path) -> Option<~str> {
+    let files = os::list_dir(p);
+    for q in files.iter() {
+        let as_path = Path(*q);
+        if as_path.filetype() == Some(os::consts::DLL_SUFFIX.to_owned()) {
+            let stuff : ~str = as_path.filestem().expect("has_library: weird path");
+            let mut stuff2 = stuff.split_str_iter(&"-");
+            let stuff3: ~[&str] = stuff2.collect();
+            // argh
+            let chars_to_drop = os::consts::DLL_PREFIX.len();
+            return Some(stuff3[0].slice(chars_to_drop, stuff3[0].len()).to_owned());
+        }
+    }
+    None
+}
+
 pub fn package_is_installed(p: &PkgId) -> bool {
     let mut is_installed = false;
     do list_installed_packages() |installed| {
@@ -44,4 +70,4 @@ pub fn package_is_installed(p: &PkgId) -> bool {
         false
     };
     is_installed
-}
\ No newline at end of file
+}
diff --git a/src/librustpkg/package_id.rs b/src/librustpkg/package_id.rs
index e1cf5b1fd35..e3b3252587a 100644
--- a/src/librustpkg/package_id.rs
+++ b/src/librustpkg/package_id.rs
@@ -8,33 +8,37 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-pub use package_path::{RemotePath, LocalPath, normalize, hash};
 use version::{try_getting_version, try_getting_local_version,
               Version, NoVersion, split_version};
+use std::rt::io::Writer;
+use std::hash::Streaming;
+use std::hash;
 
 /// Path-fragment identifier of a package such as
 /// 'github.com/graydon/test'; path must be a relative
 /// path with >=1 component.
 #[deriving(Clone)]
 pub struct PkgId {
-    /// Remote path: for example, github.com/mozilla/quux-whatever
-    remote_path: RemotePath,
-    /// Local path: for example, /home/quux/github.com/mozilla/quux_whatever
-    /// Note that '-' normalizes to '_' when mapping a remote path
-    /// onto a local path
-    /// Also, this will change when we implement #6407, though we'll still
-    /// need to keep track of separate local and remote paths
-    local_path: LocalPath,
-    /// Short name. This is the local path's filestem, but we store it
+    /// This is a path, on the local filesystem, referring to where the
+    /// files for this package live. For example:
+    /// github.com/mozilla/quux-whatever (it's assumed that if we're
+    /// working with a package ID of this form, rustpkg has already cloned
+    /// the sources into a local directory in the RUST_PATH).
+    path: Path,
+    /// Short name. This is the path's filestem, but we store it
     /// redundantly so as to not call get() everywhere (filestem() returns an
     /// option)
+    /// The short name does not need to be a valid Rust identifier.
+    /// Users can write: `extern mod foo = "...";` to get around the issue
+    /// of package IDs whose short names aren't valid Rust identifiers.
     short_name: ~str,
+    /// The requested package version.
     version: Version
 }
 
 impl Eq for PkgId {
     fn eq(&self, p: &PkgId) -> bool {
-        *p.local_path == *self.local_path && p.version == self.version
+        p.path == self.path && p.version == self.version
     }
     fn ne(&self, p: &PkgId) -> bool {
         !(self.eq(p))
@@ -42,10 +46,7 @@ impl Eq for PkgId {
 }
 
 impl PkgId {
-    // The PkgId constructor takes a Path argument so as
-    // to be able to infer the version if the path refers
-    // to a local git repository
-    pub fn new(s: &str, work_dir: &Path) -> PkgId {
+    pub fn new(s: &str) -> PkgId {
         use conditions::bad_pkg_id::cond;
 
         let mut given_version = None;
@@ -63,51 +64,64 @@ impl PkgId {
             }
         };
 
-        let p = Path(s);
-        if p.is_absolute {
-            return cond.raise((p, ~"absolute pkgid"));
+        let path = Path(s);
+        if path.is_absolute {
+            return cond.raise((path, ~"absolute pkgid"));
         }
-        if p.components.len() < 1 {
-            return cond.raise((p, ~"0-length pkgid"));
+        if path.components.len() < 1 {
+            return cond.raise((path, ~"0-length pkgid"));
         }
-        let remote_path = RemotePath(p);
-        let local_path = normalize(remote_path.clone());
-        let short_name = local_path.clone().filestem().expect(fmt!("Strange path! %s", s));
+        let short_name = path.clone().filestem().expect(fmt!("Strange path! %s", s));
 
         let version = match given_version {
             Some(v) => v,
-            None => match try_getting_local_version(&work_dir.push_rel(&*local_path)) {
+            None => match try_getting_local_version(&path) {
                 Some(v) => v,
-                None => match try_getting_version(&remote_path) {
+                None => match try_getting_version(&path) {
                     Some(v) => v,
                     None => NoVersion
                 }
             }
         };
 
-        debug!("local_path = %s, remote_path = %s", local_path.to_str(), remote_path.to_str());
+        debug!("path = %s", path.to_str());
         PkgId {
-            local_path: local_path,
-            remote_path: remote_path,
+            path: path,
             short_name: short_name,
             version: version
         }
     }
 
     pub fn hash(&self) -> ~str {
-        fmt!("%s-%s-%s", self.remote_path.to_str(),
-             hash(self.remote_path.to_str() + self.version.to_str()),
+        fmt!("%s-%s-%s", self.path.to_str(),
+             hash(self.path.to_str() + self.version.to_str()),
              self.version.to_str())
     }
 
     pub fn short_name_with_version(&self) -> ~str {
         fmt!("%s%s", self.short_name, self.version.to_str())
     }
+
+    /// True if the ID has multiple components
+    pub fn is_complex(&self) -> bool {
+        self.short_name != self.path.to_str()
+     }
 }
 
 impl ToStr for PkgId {
     fn to_str(&self) -> ~str {
         // should probably use the filestem and not the whole path
-        fmt!("%s-%s", self.local_path.to_str(), self.version.to_str())
+        fmt!("%s-%s", self.path.to_str(), self.version.to_str())
     }
 }
+
+
+pub fn write<W: Writer>(writer: &mut W, string: &str) {
+    writer.write(string.as_bytes());
+}
+
+pub fn hash(data: ~str) -> ~str {
+    let hasher = &mut hash::default_state();
+    write(hasher, data);
+    hasher.result_str()
+}
diff --git a/src/librustpkg/package_path.rs b/src/librustpkg/package_path.rs
deleted file mode 100644
index 4ba9c8066e4..00000000000
--- a/src/librustpkg/package_path.rs
+++ /dev/null
@@ -1,68 +0,0 @@
-// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-// rustpkg utilities having to do with local and remote paths
-
-use std::clone::Clone;
-use std::hash::Streaming;
-use std::hash;
-use std::option::Some;
-use std::path::Path;
-use std::rt::io::Writer;
-
-/// Wrappers to prevent local and remote paths from getting confused
-/// (These will go away after #6407)
-pub struct RemotePath (Path);
-
-impl Clone for RemotePath {
-    fn clone(&self) -> RemotePath {
-        RemotePath((**self).clone())
-    }
-}
-
-pub struct LocalPath (Path);
-
-impl Clone for LocalPath {
-    fn clone(&self) -> LocalPath {
-        LocalPath((**self).clone())
-    }
-}
-
-
-// normalize should be the only way to construct a LocalPath
-// (though this isn't enforced)
-/// Replace all occurrences of '-' in the stem part of path with '_'
-/// This is because we treat rust-foo-bar-quux and rust_foo_bar_quux
-/// as the same name
-pub fn normalize(p_: RemotePath) -> LocalPath {
-    let RemotePath(p) = p_;
-    match p.filestem() {
-        None => LocalPath(p),
-        Some(st) => {
-            let replaced = st.replace("-", "_");
-            if replaced != st {
-                LocalPath(p.with_filestem(replaced))
-            }
-            else {
-                LocalPath(p)
-            }
-        }
-    }
-}
-
-pub fn write<W: Writer>(writer: &mut W, string: &str) {
-    writer.write(string.as_bytes());
-}
-
-pub fn hash(data: ~str) -> ~str {
-    let hasher = &mut hash::default_state();
-    write(hasher, data);
-    hasher.result_str()
-}
diff --git a/src/librustpkg/package_source.rs b/src/librustpkg/package_source.rs
index bbe35ee5004..9833e18e016 100644
--- a/src/librustpkg/package_source.rs
+++ b/src/librustpkg/package_source.rs
@@ -11,7 +11,7 @@
 use target::*;
 use package_id::PkgId;
 use std::path::Path;
-use std::{os, str};
+use std::os;
 use context::*;
 use crate::Crate;
 use messages::*;
@@ -23,7 +23,6 @@ use util::compile_crate;
 // This contains a list of files found in the source workspace.
 pub struct PkgSrc {
     root: Path, // root of where the package source code lives
-    dst_dir: Path, // directory where we will put the compiled output
     id: PkgId,
     libs: ~[Crate],
     mains: ~[Crate],
@@ -37,11 +36,9 @@ condition! {
 
 impl PkgSrc {
 
-    pub fn new(src_dir: &Path, dst_dir: &Path,
-                  id: &PkgId) -> PkgSrc {
+    pub fn new(src_dir: &Path, id: &PkgId) -> PkgSrc {
         PkgSrc {
             root: (*src_dir).clone(),
-            dst_dir: (*dst_dir).clone(),
             id: (*id).clone(),
             libs: ~[],
             mains: ~[],
@@ -54,8 +51,7 @@ impl PkgSrc {
     fn check_dir(&self) -> Path {
         use conditions::nonexistent_package::cond;
 
-        debug!("Pushing onto root: %s | %s", self.id.remote_path.to_str(),
-               self.root.to_str());
+        debug!("Pushing onto root: %s | %s", self.id.path.to_str(), self.root.to_str());
         let dir;
         let dirs = pkgid_src_in_workspace(&self.id, &self.root);
         debug!("Checking dirs: %?", dirs);
@@ -89,18 +85,18 @@ impl PkgSrc {
         os::remove_dir_recursive(&local);
 
         debug!("Checking whether %s exists locally. Cwd = %s, does it? %?",
-               self.id.local_path.to_str(),
+               self.id.path.to_str(),
                os::getcwd().to_str(),
-               os::path_exists(&*self.id.local_path));
+               os::path_exists(&self.id.path));
 
-        if os::path_exists(&*self.id.local_path) {
+        if os::path_exists(&self.id.path) {
             debug!("%s exists locally! Cloning it into %s",
-                   self.id.local_path.to_str(), local.to_str());
-            git_clone(&*self.id.local_path, &local, &self.id.version);
+                   self.id.path.to_str(), local.to_str());
+            git_clone(&self.id.path, &local, &self.id.version);
             return Some(local);
         }
 
-        let url = fmt!("https://%s", self.id.remote_path.to_str());
+        let url = fmt!("https://%s", self.id.path.to_str());
         note(fmt!("Fetching package: git clone %s %s [version=%s]",
                   url, local.to_str(), self.id.version.to_str()));
         if git_clone_general(url, &local, &self.id.version) {
@@ -125,25 +121,8 @@ impl PkgSrc {
     }
 
     /// True if the given path's stem is self's pkg ID's stem
-    /// or if the pkg ID's stem is <rust-foo> and the given path's
-    /// stem is foo
-    /// Requires that dashes in p have already been normalized to
-    /// underscores
     fn stem_matches(&self, p: &Path) -> bool {
-        let self_id = self.id.local_path.filestem();
-        if self_id == p.filestem() {
-            return true;
-        }
-        else {
-            for pth in self_id.iter() {
-                if pth.starts_with("rust_") // because p is already normalized
-                    && match p.filestem() {
-                           Some(s) => str::eq_slice(s, pth.slice(5, pth.len())),
-                           None => false
-                       } { return true; }
-            }
-        }
-        false
+        p.filestem().map_default(false, |p| { p == &self.id.short_name })
     }
 
     fn push_crate(cs: &mut ~[Crate], prefix: uint, p: &Path) {
@@ -164,7 +143,7 @@ impl PkgSrc {
         let dir = self.check_dir();
         debug!("Called check_dir, I'm in %s", dir.to_str());
         let prefix = dir.components.len();
-        debug!("Matching against %?", self.id.local_path.filestem());
+        debug!("Matching against %?", self.id.short_name);
         do os::walk_dir(&dir) |pth| {
             match pth.filename() {
                 Some(~"lib.rs") => PkgSrc::push_crate(&mut self.libs,
@@ -202,7 +181,6 @@ impl PkgSrc {
 
     fn build_crates(&self,
                     ctx: &Ctx,
-                    dst_dir: &Path,
                     src_dir: &Path,
                     crates: &[Crate],
                     cfgs: &[~str],
@@ -210,12 +188,13 @@ impl PkgSrc {
         for crate in crates.iter() {
             let path = &src_dir.push_rel(&crate.file).normalize();
             note(fmt!("build_crates: compiling %s", path.to_str()));
-            note(fmt!("build_crates: destination dir is %s", dst_dir.to_str()));
+            note(fmt!("build_crates: using as workspace %s", self.root.to_str()));
 
             let result = compile_crate(ctx,
                                        &self.id,
                                        path,
-                                       dst_dir,
+                                       // compile_crate wants the workspace
+                                       &self.root,
                                        crate.flags,
                                        crate.cfgs + cfgs,
                                        false,
@@ -229,15 +208,15 @@ impl PkgSrc {
         }
     }
 
-    pub fn build(&self, ctx: &Ctx, dst_dir: Path, cfgs: ~[~str]) {
+    pub fn build(&self, ctx: &Ctx, cfgs: ~[~str]) {
         let dir = self.check_dir();
         debug!("Building libs in %s", dir.to_str());
-        self.build_crates(ctx, &dst_dir, &dir, self.libs, cfgs, Lib);
+        self.build_crates(ctx, &dir, self.libs, cfgs, Lib);
         debug!("Building mains");
-        self.build_crates(ctx, &dst_dir, &dir, self.mains, cfgs, Main);
+        self.build_crates(ctx, &dir, self.mains, cfgs, Main);
         debug!("Building tests");
-        self.build_crates(ctx, &dst_dir, &dir, self.tests, cfgs, Test);
+        self.build_crates(ctx, &dir, self.tests, cfgs, Test);
         debug!("Building benches");
-        self.build_crates(ctx, &dst_dir, &dir, self.benchs, cfgs, Bench);
+        self.build_crates(ctx, &dir, self.benchs, cfgs, Bench);
     }
 }
diff --git a/src/librustpkg/path_util.rs b/src/librustpkg/path_util.rs
index fdfa29b2f83..bbe84b2ecac 100644
--- a/src/librustpkg/path_util.rs
+++ b/src/librustpkg/path_util.rs
@@ -10,65 +10,17 @@
 
 // rustpkg utilities having to do with paths and directories
 
-pub use package_path::{RemotePath, LocalPath, normalize};
 pub use package_id::PkgId;
 pub use target::{OutputType, Main, Lib, Test, Bench, Target, Build, Install};
 pub use version::{Version, NoVersion, split_version_general};
+pub use rustc::metadata::filesearch::rust_path;
+
 use std::libc::consts::os::posix88::{S_IRUSR, S_IWUSR, S_IXUSR};
 use std::os::mkdir_recursive;
 use std::os;
-use std::iterator::IteratorUtil;
 use messages::*;
 use package_id::*;
 
-fn push_if_exists(vec: &mut ~[Path], p: &Path) {
-    let maybe_dir = p.push(".rust");
-    if os::path_exists(&maybe_dir) {
-        vec.push(maybe_dir);
-    }
-}
-
-#[cfg(windows)]
-static PATH_ENTRY_SEPARATOR: &'static str = ";";
-#[cfg(not(windows))]
-static PATH_ENTRY_SEPARATOR: &'static str = ":";
-
-/// Returns RUST_PATH as a string, without default paths added
-pub fn get_rust_path() -> Option<~str> {
-    os::getenv("RUST_PATH")
-}
-
-/// Returns the value of RUST_PATH, as a list
-/// of Paths. Includes default entries for, if they exist:
-/// $HOME/.rust
-/// DIR/.rust for any DIR that's the current working directory
-/// or an ancestor of it
-pub fn rust_path() -> ~[Path] {
-    let mut env_rust_path: ~[Path] = match get_rust_path() {
-        Some(env_path) => {
-            let env_path_components: ~[&str] =
-                env_path.split_str_iter(PATH_ENTRY_SEPARATOR).collect();
-            env_path_components.map(|&s| Path(s))
-        }
-        None => ~[]
-    };
-    debug!("RUST_PATH entries from environment: %?", env_rust_path);
-    let cwd = os::getcwd();
-    // now add in default entries
-    env_rust_path.push(cwd.clone());
-    do cwd.each_parent() |p| { push_if_exists(&mut env_rust_path, p) };
-    let h = os::homedir();
-    // Avoid adding duplicates
-    // could still add dups if someone puts one of these in the RUST_PATH
-    // manually, though...
-    for hdir in h.iter() {
-        if !(cwd.is_ancestor_of(hdir) || hdir.is_ancestor_of(&cwd)) {
-            push_if_exists(&mut env_rust_path, hdir);
-        }
-    }
-    env_rust_path
-}
-
 pub fn default_workspace() -> Path {
     let p = rust_path();
     if p.is_empty() {
@@ -99,39 +51,39 @@ pub fn make_dir_rwx(p: &Path) -> bool { os::make_dir(p, U_RWX) }
 /// pkgid's short name
 pub fn workspace_contains_package_id(pkgid: &PkgId, workspace: &Path) -> bool {
     let src_dir = workspace.push("src");
-    let dirs = os::list_dir(&src_dir);
-    for p in dirs.iter() {
-        let p = Path((*p).clone());
+    let mut found = false;
+    do os::walk_dir(&src_dir) |p| {
         debug!("=> p = %s", p.to_str());
-        if !os::path_is_dir(&src_dir.push_rel(&p)) {
-            loop;
-        }
-        debug!("p = %s, remote_path = %s", p.to_str(), pkgid.remote_path.to_str());
+        if os::path_is_dir(p) {
+            debug!("p = %s, path = %s [%s]", p.to_str(), pkgid.path.to_str(),
+            src_dir.push_rel(&pkgid.path).to_str());
 
-        if p == *pkgid.remote_path {
-            return true;
-        }
-        else {
-            let pf = p.filename();
-            for pf in pf.iter() {
-                let f_ = (*pf).clone();
-                let g = f_.to_str();
-                match split_version_general(g, '-') {
-                    Some((ref might_match, ref vers)) => {
-                        debug!("might_match = %s, vers = %s", *might_match,
+            if *p == src_dir.push_rel(&pkgid.path) {
+                found = true;
+            }
+            else {
+                let pf = p.filename();
+                for pf in pf.iter() {
+                    let f_ = (*pf).clone();
+                    let g = f_.to_str();
+                    match split_version_general(g, '-') {
+                        Some((ref might_match, ref vers)) => {
+                            debug!("might_match = %s, vers = %s", *might_match,
                                vers.to_str());
-                        if *might_match == pkgid.short_name
-                            && (*vers == pkgid.version || pkgid.version == NoVersion)
-                        {
-                            return true;
+                            if *might_match == pkgid.short_name
+                                 && (*vers == pkgid.version || pkgid.version == NoVersion)
+                            {
+                                  found = true;
+                            }
                         }
-                    }
-                    None => ()
+                        None => ()
+                     }
                 }
             }
         }
-    }
-    false
+        true
+    };
+    found
 }
 
 /// Returns a list of possible directories
@@ -141,9 +93,9 @@ pub fn workspace_contains_package_id(pkgid: &PkgId, workspace: &Path) -> bool {
 pub fn pkgid_src_in_workspace(pkgid: &PkgId, workspace: &Path) -> ~[Path] {
     let mut results = ~[];
     let result = workspace.push("src").push(fmt!("%s-%s",
-                     pkgid.local_path.to_str(), pkgid.version.to_str()));
+                     pkgid.path.to_str(), pkgid.version.to_str()));
     results.push(result);
-    results.push(workspace.push("src").push_rel(&*pkgid.remote_path));
+    results.push(workspace.push("src").push_rel(&pkgid.path));
     results
 }
 
@@ -163,7 +115,7 @@ pub fn first_pkgid_src_in_workspace(pkgid: &PkgId, workspace: &Path) -> Option<P
 pub fn built_executable_in_workspace(pkgid: &PkgId, workspace: &Path) -> Option<Path> {
     let mut result = workspace.push("build");
     // should use a target-specific subdirectory
-    result = mk_output_path(Main, Build, pkgid, &result);
+    result = mk_output_path(Main, Build, pkgid, result);
     debug!("built_executable_in_workspace: checking whether %s exists",
            result.to_str());
     if os::path_exists(&result) {
@@ -191,7 +143,7 @@ pub fn built_bench_in_workspace(pkgid: &PkgId, workspace: &Path) -> Option<Path>
 fn output_in_workspace(pkgid: &PkgId, workspace: &Path, what: OutputType) -> Option<Path> {
     let mut result = workspace.push("build");
     // should use a target-specific subdirectory
-    result = mk_output_path(what, Build, pkgid, &result);
+    result = mk_output_path(what, Build, pkgid, result);
     debug!("output_in_workspace: checking whether %s exists",
            result.to_str());
     if os::path_exists(&result) {
@@ -206,14 +158,12 @@ fn output_in_workspace(pkgid: &PkgId, workspace: &Path, what: OutputType) -> Opt
 /// Figure out what the library name for <pkgid> in <workspace>'s build
 /// directory is, and if the file exists, return it.
 pub fn built_library_in_workspace(pkgid: &PkgId, workspace: &Path) -> Option<Path> {
-    library_in_workspace(&pkgid.local_path, pkgid.short_name,
-                         Build, workspace, "build")
+    library_in_workspace(&pkgid.path, pkgid.short_name, Build, workspace, "build")
 }
 
 /// Does the actual searching stuff
 pub fn installed_library_in_workspace(short_name: &str, workspace: &Path) -> Option<Path> {
-    library_in_workspace(&normalize(RemotePath(Path(short_name))),
-                         short_name, Install, workspace, "lib")
+    library_in_workspace(&Path(short_name), short_name, Install, workspace, "lib")
 }
 
 
@@ -221,7 +171,7 @@ pub fn installed_library_in_workspace(short_name: &str, workspace: &Path) -> Opt
 /// don't know the entire package ID.
 /// `workspace` is used to figure out the directory to search.
 /// `short_name` is taken as the link name of the library.
-pub fn library_in_workspace(path: &LocalPath, short_name: &str, where: Target,
+pub fn library_in_workspace(path: &Path, short_name: &str, where: Target,
                         workspace: &Path, prefix: &str) -> Option<Path> {
     debug!("library_in_workspace: checking whether a library named %s exists",
            short_name);
@@ -233,7 +183,7 @@ pub fn library_in_workspace(path: &LocalPath, short_name: &str, where: Target,
             prefix = %s", short_name, where, workspace.to_str(), prefix);
 
     let dir_to_search = match where {
-        Build => workspace.push(prefix).push_rel(&**path),
+        Build => workspace.push(prefix).push_rel(path),
         Install => workspace.push(prefix)
     };
     debug!("Listing directory %s", dir_to_search.to_str());
@@ -349,7 +299,7 @@ fn target_file_in_workspace(pkgid: &PkgId, workspace: &Path,
     // Artifacts in the build directory live in a package-ID-specific subdirectory,
     // but installed ones don't.
     let result = match where {
-                Build => workspace.push(subdir).push_rel(&*pkgid.local_path),
+                Build => workspace.push(subdir).push_rel(&pkgid.path),
                 _     => workspace.push(subdir)
     };
     if !os::path_exists(&result) && !mkdir_recursive(&result, U_RWX) {
@@ -357,7 +307,7 @@ fn target_file_in_workspace(pkgid: &PkgId, workspace: &Path,
             create the %s dir (pkgid=%s, workspace=%s, what=%?, where=%?",
             subdir, pkgid.to_str(), workspace.to_str(), what, where)));
     }
-    mk_output_path(what, where, pkgid, &result)
+    mk_output_path(what, where, pkgid, result)
 }
 
 /// Return the directory for <pkgid>'s build artifacts in <workspace>.
@@ -368,7 +318,7 @@ pub fn build_pkg_id_in_workspace(pkgid: &PkgId, workspace: &Path) -> Path {
     let mut result = workspace.push("build");
     // n.b. Should actually use a target-specific
     // subdirectory of build/
-    result = result.push_rel(&*pkgid.local_path);
+    result = result.push_rel(&pkgid.path);
     if os::path_exists(&result) || os::mkdir_recursive(&result, U_RWX) {
         result
     }
@@ -380,19 +330,16 @@ pub fn build_pkg_id_in_workspace(pkgid: &PkgId, workspace: &Path) -> Path {
 /// Return the output file for a given directory name,
 /// given whether we're building a library and whether we're building tests
 pub fn mk_output_path(what: OutputType, where: Target,
-                      pkg_id: &PkgId, workspace: &Path) -> Path {
+                      pkg_id: &PkgId, workspace: Path) -> Path {
     let short_name_with_version = fmt!("%s-%s", pkg_id.short_name,
                                        pkg_id.version.to_str());
     // Not local_path.dir_path()! For package foo/bar/blat/, we want
     // the executable blat-0.5 to live under blat/
     let dir = match where {
         // If we're installing, it just goes under <workspace>...
-        Install => {
-            // bad copy, but I just couldn't make the borrow checker happy
-            (*workspace).clone()
-        }
+        Install => workspace,
         // and if we're just building, it goes in a package-specific subdir
-        Build => workspace.push_rel(&*pkg_id.local_path)
+        Build => workspace.push_rel(&pkg_id.path)
     };
     debug!("[%?:%?] mk_output_path: short_name = %s, path = %s", what, where,
            if what == Lib { short_name_with_version.clone() } else { pkg_id.short_name.clone() },
diff --git a/src/librustpkg/rustpkg.rs b/src/librustpkg/rustpkg.rs
index fa03a5bbfc2..26dab4120fd 100644
--- a/src/librustpkg/rustpkg.rs
+++ b/src/librustpkg/rustpkg.rs
@@ -33,12 +33,13 @@ use std::hashmap::HashMap;
 
 use rustc::driver::{driver, session};
 use rustc::metadata::filesearch;
+use rustc::metadata::filesearch::rust_path;
 use extra::{getopts};
 use syntax::{ast, diagnostic};
 use util::*;
 use messages::*;
 use path_util::{build_pkg_id_in_workspace, first_pkgid_src_in_workspace};
-use path_util::{U_RWX, rust_path, in_rust_path};
+use path_util::{U_RWX, in_rust_path};
 use path_util::{built_executable_in_workspace, built_library_in_workspace, default_workspace};
 use path_util::{target_executable_in_workspace, target_library_in_workspace};
 use source_control::is_git_dir;
@@ -54,7 +55,6 @@ mod crate;
 mod installed_packages;
 mod messages;
 mod package_id;
-mod package_path;
 mod package_source;
 mod path_util;
 mod search;
@@ -138,35 +138,28 @@ impl<'self> PkgScript<'self> {
         let crate = util::ready_crate(sess, self.crate);
         debug!("Building output filenames with script name %s",
                driver::source_name(&self.input));
-        match filesearch::get_rustpkg_sysroot() {
-            Ok(r) => {
-                let root = r.pop().pop().pop().pop(); // :-\
-                debug!("Root is %s, calling compile_rest", root.to_str());
-                let exe = self.build_dir.push(~"pkg" + util::exe_suffix());
-                util::compile_crate_from_input(&self.input,
-                                               &self.build_dir,
-                                               sess,
-                                               crate);
-                debug!("Running program: %s %s %s %s", exe.to_str(),
-                       sysroot.to_str(), root.to_str(), "install");
-                // FIXME #7401 should support commands besides `install`
-                let status = run::process_status(exe.to_str(), [sysroot.to_str(), ~"install"]);
-                if status != 0 {
-                    return (~[], status);
-                }
-                else {
-                    debug!("Running program (configs): %s %s %s",
-                           exe.to_str(), root.to_str(), "configs");
-                    let output = run::process_output(exe.to_str(), [root.to_str(), ~"configs"]);
-                    // Run the configs() function to get the configs
-                    let cfgs = str::from_bytes_slice(output.output).word_iter()
-                        .transform(|w| w.to_owned()).collect();
-                    (cfgs, output.status)
-                }
-            }
-            Err(e) => {
-                fail!("Running package script, couldn't find rustpkg sysroot (%s)", e)
-            }
+        let root = filesearch::get_or_default_sysroot().pop().pop(); // :-\
+        debug!("Root is %s, calling compile_rest", root.to_str());
+        let exe = self.build_dir.push(~"pkg" + util::exe_suffix());
+        util::compile_crate_from_input(&self.input,
+                                       &self.build_dir,
+                                       sess,
+                                       crate);
+        debug!("Running program: %s %s %s %s", exe.to_str(),
+               sysroot.to_str(), root.to_str(), "install");
+        // FIXME #7401 should support commands besides `install`
+        let status = run::process_status(exe.to_str(), [sysroot.to_str(), ~"install"]);
+        if status != 0 {
+            return (~[], status);
+        }
+        else {
+            debug!("Running program (configs): %s %s %s",
+                   exe.to_str(), root.to_str(), "configs");
+            let output = run::process_output(exe.to_str(), [root.to_str(), ~"configs"]);
+            // Run the configs() function to get the configs
+            let cfgs = str::from_bytes_slice(output.output).word_iter()
+                .transform(|w| w.to_owned()).collect();
+            (cfgs, output.status)
         }
     }
 
@@ -205,7 +198,7 @@ impl CtxMethods for Ctx {
                 else {
                     // The package id is presumed to be the first command-line
                     // argument
-                    let pkgid = PkgId::new(args[0].clone(), &os::getcwd());
+                    let pkgid = PkgId::new(args[0].clone());
                     do each_pkg_parent_workspace(&pkgid) |workspace| {
                         debug!("found pkg %s in workspace %s, trying to build",
                                pkgid.to_str(), workspace.to_str());
@@ -228,7 +221,7 @@ impl CtxMethods for Ctx {
                 else {
                     // The package id is presumed to be the first command-line
                     // argument
-                    let pkgid = PkgId::new(args[0].clone(), &os::getcwd());
+                    let pkgid = PkgId::new(args[0].clone());
                     let cwd = os::getcwd();
                     self.clean(&cwd, &pkgid); // tjc: should use workspace, not cwd
                 }
@@ -254,13 +247,12 @@ impl CtxMethods for Ctx {
                 else {
                     // The package id is presumed to be the first command-line
                     // argument
-                    let pkgid = PkgId::new(args[0], &os::getcwd());
+                    let pkgid = PkgId::new(args[0]);
                     let workspaces = pkg_parent_workspaces(&pkgid);
                     if workspaces.is_empty() {
                         let rp = rust_path();
                         assert!(!rp.is_empty());
-                        let src = PkgSrc::new(&rp[0], &build_pkg_id_in_workspace(&pkgid, &rp[0]),
-                                              &pkgid);
+                        let src = PkgSrc::new(&rp[0], &pkgid);
                         src.fetch_git();
                         self.install(&rp[0], &pkgid);
                     }
@@ -275,7 +267,7 @@ impl CtxMethods for Ctx {
             "list" => {
                 io::println("Installed packages:");
                 do installed_packages::list_installed_packages |pkg_id| {
-                    println(pkg_id.local_path.to_str());
+                    println(pkg_id.path.to_str());
                     true
                 };
             }
@@ -294,7 +286,7 @@ impl CtxMethods for Ctx {
                     return usage::uninstall();
                 }
 
-                let pkgid = PkgId::new(args[0], &os::getcwd()); // ??
+                let pkgid = PkgId::new(args[0]);
                 if !installed_packages::package_is_installed(&pkgid) {
                     warn(fmt!("Package %s doesn't seem to be installed! Doing nothing.", args[0]));
                     return;
@@ -329,20 +321,18 @@ impl CtxMethods for Ctx {
     fn build(&self, workspace: &Path, pkgid: &PkgId) {
         debug!("build: workspace = %s (in Rust path? %? is git dir? %? \
                 pkgid = %s", workspace.to_str(),
-               in_rust_path(workspace), is_git_dir(&workspace.push_rel(&*pkgid.local_path)),
+               in_rust_path(workspace), is_git_dir(&workspace.push_rel(&pkgid.path)),
                pkgid.to_str());
         let src_dir   = first_pkgid_src_in_workspace(pkgid, workspace);
-        let build_dir = build_pkg_id_in_workspace(pkgid, workspace);
-        debug!("Destination dir = %s", build_dir.to_str());
 
         // If workspace isn't in the RUST_PATH, and it's a git repo,
         // then clone it into the first entry in RUST_PATH, and repeat
         debug!("%? %? %s", in_rust_path(workspace),
-               is_git_dir(&workspace.push_rel(&*pkgid.local_path)),
+               is_git_dir(&workspace.push_rel(&pkgid.path)),
                workspace.to_str());
-        if !in_rust_path(workspace) && is_git_dir(&workspace.push_rel(&*pkgid.local_path)) {
-            let out_dir = default_workspace().push("src").push_rel(&*pkgid.local_path);
-            source_control::git_clone(&workspace.push_rel(&*pkgid.local_path),
+        if !in_rust_path(workspace) && is_git_dir(&workspace.push_rel(&pkgid.path)) {
+            let out_dir = default_workspace().push("src").push_rel(&pkgid.path);
+            source_control::git_clone(&workspace.push_rel(&pkgid.path),
                                       &out_dir, &pkgid.version);
             let default_ws = default_workspace();
             debug!("Calling build recursively with %? and %?", default_ws.to_str(),
@@ -351,7 +341,7 @@ impl CtxMethods for Ctx {
         }
 
         // Create the package source
-        let mut src = PkgSrc::new(workspace, &build_dir, pkgid);
+        let mut src = PkgSrc::new(workspace, pkgid);
         debug!("Package src = %?", src);
 
         // Is there custom build logic? If so, use it
@@ -385,7 +375,7 @@ impl CtxMethods for Ctx {
             // Find crates inside the workspace
             src.find_crates();
             // Build it!
-            src.build(self, build_dir, cfgs);
+            src.build(self, cfgs);
         }
     }
 
@@ -444,6 +434,7 @@ impl CtxMethods for Ctx {
         for lib in maybe_library.iter() {
             let target_lib = target_lib.clone().expect(fmt!("I built %s but apparently \
                                                 didn't install it!", lib.to_str()));
+            let target_lib = target_lib.pop().push(lib.filename().expect("weird target lib"));
             debug!("Copying: %s -> %s", lib.to_str(), target_lib.to_str());
             if !(os::mkdir_recursive(&target_lib.dir_path(), U_RWX) &&
                  os::copy_file(lib, &target_lib)) {
@@ -518,9 +509,7 @@ pub fn main() {
         };
     }
 
-    let sroot = match filesearch::get_rustpkg_sysroot() {
-        Ok(r) => Some(@r.pop().pop()), Err(_) => None
-    };
+    let sroot = Some(@filesearch::get_or_default_sysroot());
     debug!("Using sysroot: %?", sroot);
     Ctx {
         sysroot_opt: sroot, // Currently, only tests override this
diff --git a/src/librustpkg/source_control.rs b/src/librustpkg/source_control.rs
index e3b796a03bb..caa004a53b2 100644
--- a/src/librustpkg/source_control.rs
+++ b/src/librustpkg/source_control.rs
@@ -10,7 +10,7 @@
 
 // Utils for working with version control repositories. Just git right now.
 
-use std::{os, run, str};
+use std::{io, os, run, str};
 use std::run::{ProcessOutput, ProcessOptions, Process};
 use version::*;
 
@@ -19,14 +19,37 @@ pub fn git_clone(source: &Path, target: &Path, v: &Version) {
     assert!(os::path_is_dir(source));
     assert!(is_git_dir(source));
     if !os::path_exists(target) {
-        debug!("Running: git clone %s %s", source.to_str(),
-               target.to_str());
-        assert!(git_clone_general(source.to_str(), target, v));
+        debug!("Running: git clone %s %s", source.to_str(), target.to_str());
+        let outp = run::process_output("git", [~"clone", source.to_str(), target.to_str()]);
+        if outp.status != 0 {
+            io::println(str::from_bytes_owned(outp.output.clone()));
+            io::println(str::from_bytes_owned(outp.error));
+            fail!("Couldn't `git clone` %s", source.to_str());
+        }
+        else {
+            match v {
+                &ExactRevision(ref s) => {
+                    debug!("`Running: git --work-tree=%s --git-dir=%s checkout %s",
+                           *s, target.to_str(), target.push(".git").to_str());
+                    let outp = run::process_output("git",
+                                   [fmt!("--work-tree=%s", target.to_str()),
+                                    fmt!("--git-dir=%s", target.push(".git").to_str()),
+                                    ~"checkout", fmt!("%s", *s)]);
+                    if outp.status != 0 {
+                        io::println(str::from_bytes_owned(outp.output.clone()));
+                        io::println(str::from_bytes_owned(outp.error));
+                        fail!("Couldn't `git checkout %s` in %s",
+                              *s, target.to_str());
+                    }
+                }
+                _ => ()
+            }
+        }
     }
     else {
-        // Pull changes
-        // Note that this ignores tags, which is probably wrong. There are no tests for
-        // it, though.
+        // Check that no version was specified. There's no reason to not handle the
+        // case where a version was requested, but I haven't implemented it.
+        assert!(*v == NoVersion);
         debug!("Running: git --work-tree=%s --git-dir=%s pull --no-edit %s",
                target.to_str(), target.push(".git").to_str(), source.to_str());
         let outp = run::process_output("git", [fmt!("--work-tree=%s", target.to_str()),
diff --git a/src/librustpkg/tests.rs b/src/librustpkg/tests.rs
index 9fea8662129..121dcf40150 100644
--- a/src/librustpkg/tests.rs
+++ b/src/librustpkg/tests.rs
@@ -12,11 +12,10 @@
 
 use context::Ctx;
 use std::hashmap::HashMap;
-use std::{io, libc, os, result, run, str};
+use std::{io, libc, os, run, str};
 use extra::tempfile::mkdtemp;
 use std::run::ProcessOutput;
 use installed_packages::list_installed_packages;
-use package_path::*;
 use package_id::{PkgId};
 use version::{ExactRevision, NoVersion, Version, Tagged};
 use path_util::{target_executable_in_workspace, target_library_in_workspace,
@@ -24,7 +23,9 @@ use path_util::{target_executable_in_workspace, target_library_in_workspace,
                make_dir_rwx, U_RWX, library_in_workspace,
                built_bench_in_workspace, built_test_in_workspace,
                built_library_in_workspace, built_executable_in_workspace,
-                installed_library_in_workspace, rust_path};
+                installed_library_in_workspace};
+use rustc::metadata::filesearch::rust_path;
+use rustc::driver::driver::host_triple;
 use target::*;
 
 /// Returns the last-modified date as an Option
@@ -42,31 +43,25 @@ fn fake_ctxt(sysroot_opt: Option<@Path>) -> Ctx {
 
 fn fake_pkg() -> PkgId {
     let sn = ~"bogus";
-    let remote = RemotePath(Path(sn));
     PkgId {
-        local_path: normalize(remote.clone()),
-        remote_path: remote,
+        path: Path(sn),
         short_name: sn,
         version: NoVersion
     }
 }
 
 fn git_repo_pkg() -> PkgId {
-    let remote = RemotePath(Path("mockgithub.com/catamorphism/test-pkg"));
     PkgId {
-        local_path: normalize(remote.clone()),
-        remote_path: remote,
-        short_name: ~"test_pkg",
+        path: Path("mockgithub.com/catamorphism/test-pkg"),
+        short_name: ~"test-pkg",
         version: NoVersion
     }
 }
 
 fn git_repo_pkg_with_tag(a_tag: ~str) -> PkgId {
-    let remote = RemotePath(Path("mockgithub.com/catamorphism/test-pkg"));
     PkgId {
-        local_path: normalize(remote.clone()),
-        remote_path: remote,
-        short_name: ~"test_pkg",
+        path: Path("mockgithub.com/catamorphism/test-pkg"),
+        short_name: ~"test-pkg",
         version: Tagged(a_tag)
     }
 }
@@ -76,13 +71,13 @@ fn writeFile(file_path: &Path, contents: &str) {
     out.write_line(contents);
 }
 
-fn mk_empty_workspace(short_name: &LocalPath, version: &Version) -> Path {
+fn mk_empty_workspace(short_name: &Path, version: &Version) -> Path {
     let workspace_dir = mkdtemp(&os::tmpdir(), "test").expect("couldn't create temp dir");
     mk_workspace(&workspace_dir, short_name, version);
     workspace_dir
 }
 
-fn mk_workspace(workspace: &Path, short_name: &LocalPath, version: &Version) -> Path {
+fn mk_workspace(workspace: &Path, short_name: &Path, version: &Version) -> Path {
     // include version number in directory name
     let package_dir = workspace.push("src").push(fmt!("%s-%s",
                                                       short_name.to_str(), version.to_str()));
@@ -90,7 +85,7 @@ fn mk_workspace(workspace: &Path, short_name: &LocalPath, version: &Version) ->
     package_dir
 }
 
-fn mk_temp_workspace(short_name: &LocalPath, version: &Version) -> Path {
+fn mk_temp_workspace(short_name: &Path, version: &Version) -> Path {
     let package_dir = mk_empty_workspace(short_name,
                                          version).push("src").push(fmt!("%s-%s",
                                                             short_name.to_str(),
@@ -116,6 +111,22 @@ fn mk_temp_workspace(short_name: &LocalPath, version: &Version) -> Path {
     package_dir
 }
 
+fn run_git(args: &[~str], env: Option<~[(~str, ~str)]>, cwd: &Path, err_msg: &str) {
+    let cwd = (*cwd).clone();
+    let mut prog = run::Process::new("git", args, run::ProcessOptions {
+        env: env.map(|v| v.slice(0, v.len())),
+        dir: Some(&cwd),
+        in_fd: None,
+        out_fd: None,
+        err_fd: None
+    });
+    let rslt = prog.finish_with_output();
+    if rslt.status != 0 {
+        fail!("%s [git returned %?, output = %s, error = %s]", err_msg,
+           rslt.status, str::from_bytes(rslt.output), str::from_bytes(rslt.error));
+    }
+}
+
 /// Should create an empty git repo in p, relative to the tmp dir, and return the new
 /// absolute path
 fn init_git_repo(p: &Path) -> Path {
@@ -125,37 +136,14 @@ fn init_git_repo(p: &Path) -> Path {
     let work_dir_for_opts = work_dir.clone();
     assert!(os::mkdir_recursive(&work_dir, U_RWX));
     debug!("Running: git init in %s", work_dir.to_str());
-    let opts = run::ProcessOptions {
-        env: None,
-        dir: Some(&work_dir_for_opts),
-        in_fd: None,
-        out_fd: None,
-        err_fd: None
-    };
-    let mut prog = run::Process::new("git", [~"init"], opts);
-    let mut output = prog.finish_with_output();
-    if output.status == 0 {
-        // Add stuff to the dir so that git tag succeeds
-        writeFile(&work_dir.push("README"), "");
-        prog = run::Process::new("git", [~"add", ~"README"], opts);
-        output = prog.finish_with_output();
-        if output.status == 0 {
-            prog = run::Process::new("git", [~"commit", ~"-m", ~"whatever"], opts);
-            output = prog.finish_with_output();
-            if output.status == 0 {
-                tmp
-            }
-            else {
-                fail!("Couldn't commit in %s", work_dir.to_str());
-            }
-        }
-        else {
-            fail!("Couldn't add in %s", work_dir.to_str());
-        }
-    }
-    else {
-        fail!("Couldn't initialize git repository in %s", work_dir.to_str())
-    }
+    let ws = work_dir.to_str();
+    run_git([~"init"], None, &work_dir_for_opts,
+        fmt!("Couldn't initialize git repository in %s", ws));
+    // Add stuff to the dir so that git tag succeeds
+    writeFile(&work_dir.push("README"), "");
+    run_git([~"add", ~"README"], None, &work_dir_for_opts, fmt!("Couldn't add in %s", ws));
+    git_commit(&work_dir_for_opts, ~"whatever");
+    tmp
 }
 
 fn add_all_and_commit(repo: &Path) {
@@ -164,51 +152,20 @@ fn add_all_and_commit(repo: &Path) {
 }
 
 fn git_commit(repo: &Path, msg: ~str) {
-    let mut prog = run::Process::new("git", [~"commit", ~"-m", msg],
-                                     run::ProcessOptions { env: None,
-                                                          dir: Some(repo),
-                                                          in_fd: None,
-                                                          out_fd: None,
-                                                          err_fd: None
-                                                         });
-    let output = prog.finish_with_output();
-    if output.status != 0 {
-        fail!("Couldn't commit in %s: output was %s", repo.to_str(),
-              str::from_bytes(output.output + output.error))
-    }
-
+    run_git([~"commit", ~"--author=tester <test@mozilla.com>", ~"-m", msg],
+            None, repo, fmt!("Couldn't commit in %s", repo.to_str()));
 }
 
 fn git_add_all(repo: &Path) {
-    let mut prog = run::Process::new("git", [~"add", ~"-A"],
-                                     run::ProcessOptions { env: None,
-                                                          dir: Some(repo),
-                                                          in_fd: None,
-                                                          out_fd: None,
-                                                          err_fd: None
-                                                         });
-    let output = prog.finish_with_output();
-    if output.status != 0 {
-        fail!("Couldn't add all files in %s: output was %s",
-              repo.to_str(), str::from_bytes(output.output + output.error))
-    }
+    run_git([~"add", ~"-A"], None, repo, fmt!("Couldn't add all files in %s", repo.to_str()));
 }
 
 fn add_git_tag(repo: &Path, tag: ~str) {
     assert!(repo.is_absolute());
     git_add_all(repo);
     git_commit(repo, ~"whatever");
-    let mut prog = run::Process::new("git", [~"tag", tag.clone()],
-                                     run::ProcessOptions { env: None,
-                                                          dir: Some(repo),
-                                                          in_fd: None,
-                                                          out_fd: None,
-                                                          err_fd: None
-                                                         });
-    let output = prog.finish_with_output();
-    if output.status != 0 {
-        fail!("Couldn't add git tag %s in %s", tag, repo.to_str())
-    }
+    run_git([~"tag", tag.clone()], None, repo,
+            fmt!("Couldn't add git tag %s in %s", tag, repo.to_str()));
 }
 
 fn is_rwx(p: &Path) -> bool {
@@ -231,6 +188,25 @@ fn test_sysroot() -> Path {
     self_path.pop()
 }
 
+// Returns the path to rustpkg
+fn rustpkg_exec() -> Path {
+    // Ugh
+    let first_try = test_sysroot().push("lib").push("rustc")
+        .push(host_triple()).push("bin").push("rustpkg");
+    if is_executable(&first_try) {
+        first_try
+    }
+    else {
+        let second_try = test_sysroot().push("bin").push("rustpkg");
+        if is_executable(&second_try) {
+            second_try
+        }
+        else {
+            fail!("in rustpkg test, can't find an installed rustpkg");
+        }
+    }
+}
+
 fn command_line_test(args: &[~str], cwd: &Path) -> ProcessOutput {
     command_line_test_with_env(args, cwd, None)
 }
@@ -240,8 +216,9 @@ fn command_line_test(args: &[~str], cwd: &Path) -> ProcessOutput {
 /// Returns the process's output.
 fn command_line_test_with_env(args: &[~str], cwd: &Path, env: Option<~[(~str, ~str)]>)
     -> ProcessOutput {
-    let cmd = test_sysroot().push("bin").push("rustpkg").to_str();
-    debug!("About to run command: %? %? in %s", cmd, args, cwd.to_str());
+    let cmd = rustpkg_exec().to_str();
+    debug!("cd %s; %s %s",
+           cwd.to_str(), cmd, args.connect(" "));
     assert!(os::path_is_dir(&*cwd));
     let cwd = (*cwd).clone();
     let mut prog = run::Process::new(cmd, args, run::ProcessOptions {
@@ -263,14 +240,15 @@ So tests that use this need to check the existence of a file
 to make sure the command succeeded
 */
     if output.status != 0 {
-        fail!("Command %s %? failed with exit code %?",
-              cmd, args, output.status);
+        fail!("Command %s %? failed with exit code %?; its output was {{{ %s }}}",
+              cmd, args, output.status,
+              str::from_bytes(output.output) + str::from_bytes(output.error));
     }
     output
 }
 
 fn create_local_package(pkgid: &PkgId) -> Path {
-    let parent_dir = mk_temp_workspace(&pkgid.local_path, &pkgid.version);
+    let parent_dir = mk_temp_workspace(&pkgid.path, &pkgid.version);
     debug!("Created empty package dir for %s, returning %s", pkgid.to_str(), parent_dir.to_str());
     parent_dir.pop().pop()
 }
@@ -327,26 +305,26 @@ fn create_local_package_with_custom_build_hook(pkgid: &PkgId,
 
 }
 
-fn assert_lib_exists(repo: &Path, short_name: &str, v: Version) {
+fn assert_lib_exists(repo: &Path, short_name: &str, _v: Version) { // ??? version?
     debug!("assert_lib_exists: repo = %s, short_name = %s", repo.to_str(), short_name);
-    let lib = target_library_in_workspace(&(PkgId {
-        version: v, ..PkgId::new(short_name, repo)}
-                                           ), repo);
-    debug!("assert_lib_exists: checking whether %s exists", lib.to_str());
-    assert!(os::path_exists(&lib));
-    assert!(is_rwx(&lib));
+    let lib = installed_library_in_workspace(short_name, repo);
+    debug!("assert_lib_exists: checking whether %? exists", lib);
+    assert!(lib.is_some());
+    let libname = lib.get_ref();
+    assert!(os::path_exists(libname));
+    assert!(is_rwx(libname));
 }
 
 fn assert_executable_exists(repo: &Path, short_name: &str) {
     debug!("assert_executable_exists: repo = %s, short_name = %s", repo.to_str(), short_name);
-    let exec = target_executable_in_workspace(&PkgId::new(short_name, repo), repo);
+    let exec = target_executable_in_workspace(&PkgId::new(short_name), repo);
     assert!(os::path_exists(&exec));
     assert!(is_rwx(&exec));
 }
 
 fn assert_built_executable_exists(repo: &Path, short_name: &str) {
     debug!("assert_built_executable_exists: repo = %s, short_name = %s", repo.to_str(), short_name);
-    let exec = built_executable_in_workspace(&PkgId::new(short_name, repo),
+    let exec = built_executable_in_workspace(&PkgId::new(short_name),
                                              repo).expect("assert_built_executable_exists failed");
     assert!(os::path_exists(&exec));
     assert!(is_rwx(&exec));
@@ -372,11 +350,11 @@ fn command_line_test_output_with_env(args: &[~str], env: ~[(~str, ~str)]) -> ~[~
     result
 }
 
-// assumes short_name and local_path are one and the same -- I should fix
+// assumes short_name and path are one and the same -- I should fix
 fn lib_output_file_name(workspace: &Path, parent: &str, short_name: &str) -> Path {
     debug!("lib_output_file_name: given %s and parent %s and short name %s",
            workspace.to_str(), parent, short_name);
-    library_in_workspace(&normalize(RemotePath(Path(short_name))),
+    library_in_workspace(&Path(short_name),
                          short_name,
                          Build,
                          workspace,
@@ -451,7 +429,7 @@ fn test_install_valid() {
     debug!("sysroot = %s", sysroot.to_str());
     let ctxt = fake_ctxt(Some(@sysroot));
     let temp_pkg_id = fake_pkg();
-    let temp_workspace = mk_temp_workspace(&temp_pkg_id.local_path, &NoVersion).pop().pop();
+    let temp_workspace = mk_temp_workspace(&temp_pkg_id.path, &NoVersion).pop().pop();
     debug!("temp_workspace = %s", temp_workspace.to_str());
     // should have test, bench, lib, and main
     ctxt.install(&temp_workspace, &temp_pkg_id);
@@ -504,7 +482,7 @@ fn test_install_git() {
     let sysroot = test_sysroot();
     debug!("sysroot = %s", sysroot.to_str());
     let temp_pkg_id = git_repo_pkg();
-    let repo = init_git_repo(&Path(temp_pkg_id.local_path.to_str()));
+    let repo = init_git_repo(&temp_pkg_id.path);
     let repo_subdir = repo.push("mockgithub.com").push("catamorphism").push("test_pkg");
     writeFile(&repo_subdir.push("main.rs"),
               "fn main() { let _x = (); }");
@@ -517,9 +495,9 @@ fn test_install_git() {
     add_git_tag(&repo_subdir, ~"0.1"); // this has the effect of committing the files
 
     debug!("test_install_git: calling rustpkg install %s in %s",
-           temp_pkg_id.local_path.to_str(), repo.to_str());
+           temp_pkg_id.path.to_str(), repo.to_str());
     // should have test, bench, lib, and main
-    command_line_test([~"install", temp_pkg_id.local_path.to_str()], &repo);
+    command_line_test([~"install", temp_pkg_id.path.to_str()], &repo);
     // Check that all files exist
     debug!("Checking for files in %s", repo.to_str());
     let exec = target_executable_in_workspace(&temp_pkg_id, &repo);
@@ -563,18 +541,18 @@ fn test_package_ids_must_be_relative_path_like() {
 
     */
 
-    let whatever = PkgId::new("foo", &os::getcwd());
+    let whatever = PkgId::new("foo");
 
     assert_eq!(~"foo-0.1", whatever.to_str());
-    assert!("github.com/catamorphism/test_pkg-0.1" ==
-            PkgId::new("github.com/catamorphism/test-pkg", &os::getcwd()).to_str());
+    assert!("github.com/catamorphism/test-pkg-0.1" ==
+            PkgId::new("github.com/catamorphism/test-pkg").to_str());
 
     do cond.trap(|(p, e)| {
         assert!("" == p.to_str());
         assert!("0-length pkgid" == e);
         whatever.clone()
     }).inside {
-        let x = PkgId::new("", &os::getcwd());
+        let x = PkgId::new("");
         assert_eq!(~"foo-0.1", x.to_str());
     }
 
@@ -583,8 +561,7 @@ fn test_package_ids_must_be_relative_path_like() {
         assert!("absolute pkgid" == e);
         whatever.clone()
     }).inside {
-        let z = PkgId::new(os::make_absolute(&Path("foo/bar/quux")).to_str(),
-                           &os::getcwd());
+        let z = PkgId::new(os::make_absolute(&Path("foo/bar/quux")).to_str());
         assert_eq!(~"foo-0.1", z.to_str());
     }
 
@@ -607,7 +584,7 @@ fn test_package_version() {
               "#[bench] pub fn f() { (); }");
     add_git_tag(&repo_subdir, ~"0.4");
 
-    let temp_pkg_id = PkgId::new("mockgithub.com/catamorphism/test_pkg_version", &repo);
+    let temp_pkg_id = PkgId::new("mockgithub.com/catamorphism/test_pkg_version");
     match temp_pkg_id.version {
         ExactRevision(~"0.4") => (),
         _ => fail!(fmt!("test_package_version: package version was %?, expected Some(0.4)",
@@ -656,7 +633,7 @@ fn test_package_request_version() {
         }
         None    => false
     });
-    let temp_pkg_id = PkgId::new("mockgithub.com/catamorphism/test_pkg_version#0.3", &repo);
+    let temp_pkg_id = PkgId::new("mockgithub.com/catamorphism/test_pkg_version#0.3");
     assert!(target_executable_in_workspace(&temp_pkg_id, &repo.push(".rust"))
             == repo.push(".rust").push("bin").push("test_pkg_version"));
 
@@ -696,12 +673,12 @@ fn rustpkg_library_target() {
 
     add_git_tag(&package_dir, ~"1.0");
     command_line_test([~"install", ~"foo"], &foo_repo);
-    assert_lib_exists(&foo_repo, "foo", ExactRevision(~"1.0"));
+    assert_lib_exists(&foo_repo.push(".rust"), "foo", ExactRevision(~"1.0"));
 }
 
 #[test]
 fn rustpkg_local_pkg() {
-    let dir = create_local_package(&PkgId::new("foo", &os::getcwd()));
+    let dir = create_local_package(&PkgId::new("foo"));
     command_line_test([~"install", ~"foo"], &dir);
     assert_executable_exists(&dir, "foo");
 }
@@ -711,7 +688,7 @@ fn rustpkg_local_pkg() {
 #[test]
 #[ignore]
 fn package_script_with_default_build() {
-    let dir = create_local_package(&PkgId::new("fancy-lib", &os::getcwd()));
+    let dir = create_local_package(&PkgId::new("fancy-lib"));
     debug!("dir = %s", dir.to_str());
     let source = test_sysroot().pop().pop().pop().push("src").push("librustpkg").
         push("testsuite").push("pass").push("src").push("fancy-lib").push("pkg.rs");
@@ -763,7 +740,7 @@ fn rustpkg_clean_no_arg() {
     command_line_test([~"build"], &package_dir);
     assert_built_executable_exists(&tmp, "foo");
     command_line_test([~"clean"], &package_dir);
-    assert!(!built_executable_in_workspace(&PkgId::new("foo", &package_dir),
+    assert!(!built_executable_in_workspace(&PkgId::new("foo"),
                 &tmp).map_default(false, |m| { os::path_exists(m) }));
 }
 
@@ -771,14 +748,13 @@ fn rustpkg_clean_no_arg() {
 #[ignore (reason = "Specifying env doesn't work -- see #8028")]
 fn rust_path_test() {
     let dir_for_path = mkdtemp(&os::tmpdir(), "more_rust").expect("rust_path_test failed");
-    let dir = mk_workspace(&dir_for_path, &normalize(RemotePath(Path("foo"))), &NoVersion);
+    let dir = mk_workspace(&dir_for_path, &Path("foo"), &NoVersion);
     debug!("dir = %s", dir.to_str());
     writeFile(&dir.push("main.rs"), "fn main() { let _x = (); }");
 
     let cwd = os::getcwd();
     debug!("cwd = %s", cwd.to_str());
-    debug!("Running command: cd %s; RUST_LOG=rustpkg RUST_PATH=%s rustpkg install foo",
-           cwd.to_str(), dir_for_path.to_str());
+                                     // use command_line_test_with_env
     let mut prog = run::Process::new("rustpkg",
                                      [~"install", ~"foo"],
                                      run::ProcessOptions { env: Some(&[(~"RUST_LOG",
@@ -830,39 +806,38 @@ fn rust_path_parse() {
 #[test]
 fn test_list() {
     let dir = mkdtemp(&os::tmpdir(), "test_list").expect("test_list failed");
-    let foo = PkgId::new("foo", &dir);
+    let foo = PkgId::new("foo");
     create_local_package_in(&foo, &dir);
-    let bar = PkgId::new("bar", &dir);
+    let bar = PkgId::new("bar");
     create_local_package_in(&bar, &dir);
-    let quux = PkgId::new("quux", &dir);
+    let quux = PkgId::new("quux");
     create_local_package_in(&quux, &dir);
 
-// NOTE Not really great output, though...
-// NOTE do any tests need to be unignored?
+// list doesn't output very much right now...
     command_line_test([~"install", ~"foo"], &dir);
     let env_arg = ~[(~"RUST_PATH", dir.to_str())];
     debug!("RUST_PATH = %s", dir.to_str());
     let list_output = command_line_test_output_with_env([~"list"], env_arg.clone());
-    assert!(list_output.iter().any(|x| x.starts_with("libfoo_")));
+    assert!(list_output.iter().any(|x| x.starts_with("foo")));
 
     command_line_test([~"install", ~"bar"], &dir);
     let list_output = command_line_test_output_with_env([~"list"], env_arg.clone());
-    assert!(list_output.iter().any(|x| x.starts_with("libfoo_")));
-    assert!(list_output.iter().any(|x| x.starts_with("libbar_")));
+    assert!(list_output.iter().any(|x| x.starts_with("foo")));
+    assert!(list_output.iter().any(|x| x.starts_with("bar")));
 
     command_line_test([~"install", ~"quux"], &dir);
     let list_output = command_line_test_output_with_env([~"list"], env_arg);
-    assert!(list_output.iter().any(|x| x.starts_with("libfoo_")));
-    assert!(list_output.iter().any(|x| x.starts_with("libbar_")));
-    assert!(list_output.iter().any(|x| x.starts_with("libquux_")));
+    assert!(list_output.iter().any(|x| x.starts_with("foo")));
+    assert!(list_output.iter().any(|x| x.starts_with("bar")));
+    assert!(list_output.iter().any(|x| x.starts_with("quux")));
 }
 
 #[test]
 fn install_remove() {
     let dir = mkdtemp(&os::tmpdir(), "install_remove").expect("install_remove");
-    let foo = PkgId::new("foo", &dir);
-    let bar = PkgId::new("bar", &dir);
-    let quux = PkgId::new("quux", &dir);
+    let foo = PkgId::new("foo");
+    let bar = PkgId::new("bar");
+    let quux = PkgId::new("quux");
     create_local_package_in(&foo, &dir);
     create_local_package_in(&bar, &dir);
     create_local_package_in(&quux, &dir);
@@ -887,7 +862,7 @@ fn install_check_duplicates() {
     // ("Is already installed -- doing nothing")
     // check invariant that there are no dups in the pkg database
     let dir = mkdtemp(&os::tmpdir(), "install_remove").expect("install_remove");
-    let foo = PkgId::new("foo", &dir);
+    let foo = PkgId::new("foo");
     create_local_package_in(&foo, &dir);
 
     command_line_test([~"install", ~"foo"], &dir);
@@ -895,7 +870,7 @@ fn install_check_duplicates() {
     let mut contents = ~[];
     let check_dups = |p: &PkgId| {
         if contents.contains(p) {
-            fail!("package %s appears in `list` output more than once", p.local_path.to_str());
+            fail!("package %s appears in `list` output more than once", p.path.to_str());
         }
         else {
             contents.push((*p).clone());
@@ -908,7 +883,7 @@ fn install_check_duplicates() {
 #[test]
 #[ignore(reason = "Workcache not yet implemented -- see #7075")]
 fn no_rebuilding() {
-    let p_id = PkgId::new("foo", &os::getcwd());
+    let p_id = PkgId::new("foo");
     let workspace = create_local_package(&p_id);
     command_line_test([~"build", ~"foo"], &workspace);
     let date = datestamp(&built_library_in_workspace(&p_id,
@@ -922,8 +897,8 @@ fn no_rebuilding() {
 #[test]
 #[ignore(reason = "Workcache not yet implemented -- see #7075")]
 fn no_rebuilding_dep() {
-    let p_id = PkgId::new("foo", &os::getcwd());
-    let dep_id = PkgId::new("bar", &os::getcwd());
+    let p_id = PkgId::new("foo");
+    let dep_id = PkgId::new("bar");
     let workspace = create_local_package_with_dep(&p_id, &dep_id);
     command_line_test([~"build", ~"foo"], &workspace);
     let bar_date = datestamp(&lib_output_file_name(&workspace,
@@ -935,8 +910,8 @@ fn no_rebuilding_dep() {
 
 #[test]
 fn do_rebuild_dep_dates_change() {
-    let p_id = PkgId::new("foo", &os::getcwd());
-    let dep_id = PkgId::new("bar", &os::getcwd());
+    let p_id = PkgId::new("foo");
+    let dep_id = PkgId::new("bar");
     let workspace = create_local_package_with_dep(&p_id, &dep_id);
     command_line_test([~"build", ~"foo"], &workspace);
     let bar_date = datestamp(&lib_output_file_name(&workspace, "build", "bar"));
@@ -948,8 +923,8 @@ fn do_rebuild_dep_dates_change() {
 
 #[test]
 fn do_rebuild_dep_only_contents_change() {
-    let p_id = PkgId::new("foo", &os::getcwd());
-    let dep_id = PkgId::new("bar", &os::getcwd());
+    let p_id = PkgId::new("foo");
+    let dep_id = PkgId::new("bar");
     let workspace = create_local_package_with_dep(&p_id, &dep_id);
     command_line_test([~"build", ~"foo"], &workspace);
     let bar_date = datestamp(&lib_output_file_name(&workspace, "build", "bar"));
@@ -962,8 +937,8 @@ fn do_rebuild_dep_only_contents_change() {
 
 #[test]
 fn test_versions() {
-    let workspace = create_local_package(&PkgId::new("foo#0.1", &os::getcwd()));
-    create_local_package(&PkgId::new("foo#0.2", &os::getcwd()));
+    let workspace = create_local_package(&PkgId::new("foo#0.1"));
+    create_local_package(&PkgId::new("foo#0.2"));
     command_line_test([~"install", ~"foo#0.1"], &workspace);
     let output = command_line_test_output([~"list"]);
     // make sure output includes versions
@@ -973,7 +948,7 @@ fn test_versions() {
 #[test]
 #[ignore(reason = "do not yet implemented")]
 fn test_build_hooks() {
-    let workspace = create_local_package_with_custom_build_hook(&PkgId::new("foo", &os::getcwd()),
+    let workspace = create_local_package_with_custom_build_hook(&PkgId::new("foo"),
                                                                 "frob");
     command_line_test([~"do", ~"foo", ~"frob"], &workspace);
 }
@@ -983,7 +958,7 @@ fn test_build_hooks() {
 #[ignore(reason = "info not yet implemented")]
 fn test_info() {
     let expected_info = ~"package foo"; // fill in
-    let workspace = create_local_package(&PkgId::new("foo", &os::getcwd()));
+    let workspace = create_local_package(&PkgId::new("foo"));
     let output = command_line_test([~"info", ~"foo"], &workspace);
     assert_eq!(str::from_bytes(output.output), expected_info);
 }
@@ -992,7 +967,7 @@ fn test_info() {
 #[ignore(reason = "test not yet implemented")]
 fn test_rustpkg_test() {
     let expected_results = ~"1 out of 1 tests passed"; // fill in
-    let workspace = create_local_package_with_test(&PkgId::new("foo", &os::getcwd()));
+    let workspace = create_local_package_with_test(&PkgId::new("foo"));
     let output = command_line_test([~"test", ~"foo"], &workspace);
     assert_eq!(str::from_bytes(output.output), expected_results);
 }
@@ -1000,7 +975,7 @@ fn test_rustpkg_test() {
 #[test]
 #[ignore(reason = "test not yet implemented")]
 fn test_uninstall() {
-    let workspace = create_local_package(&PkgId::new("foo", &os::getcwd()));
+    let workspace = create_local_package(&PkgId::new("foo"));
     let _output = command_line_test([~"info", ~"foo"], &workspace);
     command_line_test([~"uninstall", ~"foo"], &workspace);
     let output = command_line_test([~"list"], &workspace);
@@ -1010,8 +985,8 @@ fn test_uninstall() {
 #[test]
 fn test_non_numeric_tag() {
     let temp_pkg_id = git_repo_pkg();
-    let repo = init_git_repo(&Path(temp_pkg_id.local_path.to_str()));
-    let repo_subdir = repo.push("mockgithub.com").push("catamorphism").push("test_pkg");
+    let repo = init_git_repo(&temp_pkg_id.path);
+    let repo_subdir = repo.push("mockgithub.com").push("catamorphism").push("test-pkg");
     writeFile(&repo_subdir.push("foo"), "foo");
     writeFile(&repo_subdir.push("lib.rs"),
               "pub fn f() { let _x = (); }");
@@ -1021,13 +996,70 @@ fn test_non_numeric_tag() {
     writeFile(&repo_subdir.push("not_on_testbranch_only"), "bye bye");
     add_all_and_commit(&repo_subdir);
 
-
-    command_line_test([~"install", fmt!("%s#testbranch", temp_pkg_id.remote_path.to_str())],
-                      &repo);
+    command_line_test([~"install", fmt!("%s#testbranch", temp_pkg_id.path.to_str())], &repo);
     let file1 = repo.push_many(["mockgithub.com", "catamorphism",
-                                "test_pkg", "testbranch_only"]);
-    let file2 = repo.push_many(["mockgithub.com", "catamorphism", "test_pkg",
+                                "test-pkg", "testbranch_only"]);
+    let file2 = repo.push_many(["mockgithub.com", "catamorphism", "test-pkg",
                                 "master_only"]);
     assert!(os::path_exists(&file1));
     assert!(!os::path_exists(&file2));
 }
+
+#[test]
+fn test_extern_mod() {
+    let dir = mkdtemp(&os::tmpdir(), "test_extern_mod").expect("test_extern_mod");
+    let main_file = dir.push("main.rs");
+    let lib_depend_dir = mkdtemp(&os::tmpdir(), "foo").expect("test_extern_mod");
+    let aux_dir = lib_depend_dir.push_many(["src", "mockgithub.com", "catamorphism", "test_pkg"]);
+    assert!(os::mkdir_recursive(&aux_dir, U_RWX));
+    let aux_pkg_file = aux_dir.push("lib.rs");
+
+    writeFile(&aux_pkg_file, "pub mod bar { pub fn assert_true() {  assert!(true); } }\n");
+    assert!(os::path_exists(&aux_pkg_file));
+
+    writeFile(&main_file,
+              "extern mod test = \"mockgithub.com/catamorphism/test_pkg\";\nuse test::bar;\
+               fn main() { bar::assert_true(); }\n");
+
+    command_line_test([~"install", ~"mockgithub.com/catamorphism/test_pkg"], &lib_depend_dir);
+
+    let exec_file = dir.push("out");
+    // Be sure to extend the existing environment
+    let env = Some([(~"RUST_PATH", lib_depend_dir.to_str())] + os::env());
+    let rustpkg_exec = rustpkg_exec();
+    let rustc = rustpkg_exec.with_filename("rustc");
+    debug!("RUST_PATH=%s %s %s \n --sysroot %s -o %s",
+                     lib_depend_dir.to_str(),
+                     rustc.to_str(),
+                     main_file.to_str(),
+                     test_sysroot().to_str(),
+                     exec_file.to_str());
+
+    let mut prog = run::Process::new(rustc.to_str(), [main_file.to_str(),
+                                                      ~"--sysroot", test_sysroot().to_str(),
+                                               ~"-o", exec_file.to_str()],
+                                     run::ProcessOptions {
+        env: env.map(|v| v.slice(0, v.len())),
+        dir: Some(&dir),
+        in_fd: None,
+        out_fd: None,
+        err_fd: None
+    });
+    let outp = prog.finish_with_output();
+    if outp.status != 0 {
+        fail!("output was %s, error was %s",
+              str::from_bytes(outp.output),
+              str::from_bytes(outp.error));
+    }
+    assert!(os::path_exists(&exec_file) && is_executable(&exec_file));
+}
+
+/// Returns true if p exists and is executable
+fn is_executable(p: &Path) -> bool {
+    use std::libc::consts::os::posix88::{S_IXUSR};
+
+    match p.get_mode() {
+        None => false,
+        Some(mode) => mode & S_IXUSR as uint == S_IXUSR as uint
+    }
+}
diff --git a/src/librustpkg/util.rs b/src/librustpkg/util.rs
index 81b47d6a16c..ed21f8e0872 100644
--- a/src/librustpkg/util.rs
+++ b/src/librustpkg/util.rs
@@ -8,9 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::{os, result};
+use std::os;
 use rustc::driver::{driver, session};
-use rustc::metadata::filesearch;
 use extra::getopts::groups::getopts;
 use syntax::ast_util::*;
 use syntax::codemap::{dummy_sp, spanned};
@@ -19,10 +18,10 @@ use syntax::{ast, attr, codemap, diagnostic, fold};
 use syntax::attr::AttrMetaMethods;
 use rustc::back::link::output_type_exe;
 use rustc::driver::session::{lib_crate, bin_crate};
-use context::Ctx;
+use context::{Ctx, in_target};
 use package_id::PkgId;
 use search::find_library_in_search_path;
-use path_util::target_library_in_workspace;
+use path_util::{target_library_in_workspace, U_RWX};
 pub use target::{OutputType, Main, Lib, Bench, Test};
 
 // It would be nice to have the list of commands in just one place -- for example,
@@ -47,13 +46,6 @@ impl ToStr for Pkg {
     }
 }
 
-pub fn root() -> Path {
-    match filesearch::get_rustpkg_root() {
-        result::Ok(path) => path,
-        result::Err(err) => fail!(err)
-    }
-}
-
 pub fn is_cmd(cmd: &str) -> bool {
     COMMANDS.iter().any(|&c| c == cmd)
 }
@@ -162,25 +154,25 @@ pub fn ready_crate(sess: session::Session,
 pub fn compile_input(ctxt: &Ctx,
                      pkg_id: &PkgId,
                      in_file: &Path,
-                     out_dir: &Path,
+                     workspace: &Path,
                      flags: &[~str],
                      cfgs: &[~str],
                      opt: bool,
                      what: OutputType) -> bool {
 
-    let workspace = out_dir.pop().pop();
-
     assert!(in_file.components.len() > 1);
     let input = driver::file_input((*in_file).clone());
     debug!("compile_input: %s / %?", in_file.to_str(), what);
     // tjc: by default, use the package ID name as the link name
     // not sure if we should support anything else
 
+    let out_dir = workspace.push("build").push_rel(&pkg_id.path);
+
     let binary = os::args()[0].to_managed();
 
     debug!("flags: %s", flags.connect(" "));
     debug!("cfgs: %s", cfgs.connect(" "));
-    debug!("compile_input's sysroot = %?", ctxt.sysroot_opt);
+    debug!("out_dir = %s", out_dir.to_str());
 
     let crate_type = match what {
         Lib => lib_crate,
@@ -196,12 +188,22 @@ pub fn compile_input(ctxt: &Ctx,
                           + flags
                           + cfgs.flat_map(|c| { ~[~"--cfg", (*c).clone()] }),
                           driver::optgroups()).unwrap();
+    // Hack so that rustpkg can run either out of a rustc target dir,
+    // or the host dir
+    let sysroot_to_use = if !in_target(ctxt.sysroot_opt) {
+        ctxt.sysroot_opt
+    }
+    else {
+        ctxt.sysroot_opt.map(|p| { @p.pop().pop().pop() })
+    };
+    debug!("compile_input's sysroot = %?", ctxt.sysroot_opt_str());
+    debug!("sysroot_to_use = %?", sysroot_to_use);
     let options = @session::options {
         crate_type: crate_type,
         optimize: if opt { session::Aggressive } else { session::No },
         test: what == Test || what == Bench,
-        maybe_sysroot: ctxt.sysroot_opt,
-        addl_lib_search_paths: @mut (~[(*out_dir).clone()]),
+        maybe_sysroot: sysroot_to_use,
+        addl_lib_search_paths: @mut (~[out_dir.clone()]),
         // output_type should be conditional
         output_type: output_type_exe, // Use this to get a library? That's weird
         .. (*driver::build_session_options(binary, &matches, diagnostic::emit)).clone()
@@ -211,7 +213,12 @@ pub fn compile_input(ctxt: &Ctx,
     // Make sure all the library directories actually exist, since the linker will complain
     // otherwise
     for p in addl_lib_search_paths.iter() {
-        assert!(os::path_is_dir(p));
+        if os::path_exists(p) {
+            assert!(os::path_is_dir(p));
+        }
+        else {
+            assert!(os::mkdir_recursive(p, U_RWX));
+        }
     }
 
     let sess = driver::build_session(options, diagnostic::emit);
@@ -224,35 +231,44 @@ pub fn compile_input(ctxt: &Ctx,
 
     // Not really right. Should search other workspaces too, and the installed
     // database (which doesn't exist yet)
-    find_and_install_dependencies(ctxt, sess, &workspace, crate,
+    find_and_install_dependencies(ctxt, sess, workspace, crate,
                                   |p| {
                                       debug!("a dependency: %s", p.to_str());
                                       // Pass the directory containing a dependency
                                       // as an additional lib search path
-                                      addl_lib_search_paths.push(p);
+                                      if !addl_lib_search_paths.contains(&p) {
+                                          // Might be inefficient, but this set probably
+                                          // won't get too large -- tjc
+                                          addl_lib_search_paths.push(p);
+                                      }
                                   });
 
     // Inject the link attributes so we get the right package name and version
     if attr::find_linkage_metas(crate.attrs).is_empty() {
-        let short_name_to_use = match what {
-            Test  => fmt!("%stest", pkg_id.short_name),
-            Bench => fmt!("%sbench", pkg_id.short_name),
-            _     => pkg_id.short_name.clone()
+        let name_to_use = match what {
+            Test  => fmt!("%stest", pkg_id.short_name).to_managed(),
+            Bench => fmt!("%sbench", pkg_id.short_name).to_managed(),
+            _     => pkg_id.short_name.to_managed()
         };
-        debug!("Injecting link name: %s", short_name_to_use);
+        debug!("Injecting link name: %s", name_to_use);
         let link_options =
-            ~[attr::mk_name_value_item_str(@"name", short_name_to_use.to_managed()),
-              attr::mk_name_value_item_str(@"vers", pkg_id.version.to_str().to_managed())];
-
+            ~[attr::mk_name_value_item_str(@"name", name_to_use),
+              attr::mk_name_value_item_str(@"vers", pkg_id.version.to_str().to_managed())] +
+                        if pkg_id.is_complex() {
+                        ~[attr::mk_name_value_item_str(@"package_id",
+                                                       pkg_id.path.to_str().to_managed())]
+                } else { ~[] };
+
+        debug!("link options: %?", link_options);
         crate = @ast::Crate {
             attrs: ~[attr::mk_attr(attr::mk_list_item(@"link", link_options))],
             .. (*crate).clone()
-        };
+        }
     }
 
-    debug!("calling compile_crate_from_input, out_dir = %s,
+    debug!("calling compile_crate_from_input, workspace = %s,
            building_library = %?", out_dir.to_str(), sess.building_library);
-    compile_crate_from_input(&input, out_dir, sess, crate);
+    compile_crate_from_input(&input, &out_dir, sess, crate);
     true
 }
 
@@ -262,17 +278,22 @@ pub fn compile_input(ctxt: &Ctx,
 // call compile_upto and return the crate
 // also, too many arguments
 pub fn compile_crate_from_input(input: &driver::input,
-                                build_dir: &Path,
+ // should be of the form <workspace>/build/<pkg id's path>
+                                out_dir: &Path,
                                 sess: session::Session,
                                 crate: @ast::Crate) {
     debug!("Calling build_output_filenames with %s, building library? %?",
-           build_dir.to_str(), sess.building_library);
+           out_dir.to_str(), sess.building_library);
 
     // bad copy
-    let outputs = driver::build_output_filenames(input, &Some((*build_dir).clone()), &None,
+    debug!("out_dir = %s", out_dir.to_str());
+    let outputs = driver::build_output_filenames(input, &Some(out_dir.clone()), &None,
                                                  crate.attrs, sess);
 
-    debug!("Outputs are %? and output type = %?", outputs, sess.opts.output_type);
+    debug!("Outputs are out_filename: %s and obj_filename: %s and output type = %?",
+           outputs.out_filename.to_str(),
+           outputs.obj_filename.to_str(),
+           sess.opts.output_type);
     debug!("additional libraries:");
     for lib in sess.opts.addl_lib_search_paths.iter() {
         debug!("an additional library: %s", lib.to_str());
@@ -298,15 +319,15 @@ pub fn exe_suffix() -> ~str { ~"" }
 // Called by build_crates
 // FIXME (#4432): Use workcache to only compile when needed
 pub fn compile_crate(ctxt: &Ctx, pkg_id: &PkgId,
-                     crate: &Path, dir: &Path,
+                     crate: &Path, workspace: &Path,
                      flags: &[~str], cfgs: &[~str], opt: bool,
                      what: OutputType) -> bool {
-    debug!("compile_crate: crate=%s, dir=%s", crate.to_str(), dir.to_str());
+    debug!("compile_crate: crate=%s, workspace=%s", crate.to_str(), workspace.to_str());
     debug!("compile_crate: short_name = %s, flags =...", pkg_id.to_str());
     for fl in flags.iter() {
         debug!("+++ %s", *fl);
     }
-    compile_input(ctxt, pkg_id, crate, dir, flags, cfgs, opt, what)
+    compile_input(ctxt, pkg_id, crate, workspace, flags, cfgs, opt, what)
 }
 
 
@@ -327,19 +348,20 @@ pub fn find_and_install_dependencies(ctxt: &Ctx,
         debug!("A view item!");
         match vi.node {
             // ignore metadata, I guess
-            ast::view_item_extern_mod(lib_ident, _, _) => {
+            ast::view_item_extern_mod(lib_ident, path_opt, _, _) => {
                 match my_ctxt.sysroot_opt {
-                    Some(ref x) => debug!("sysroot: %s", x.to_str()),
+                    Some(ref x) => debug!("*** sysroot: %s", x.to_str()),
                     None => debug!("No sysroot given")
                 };
-                let lib_name = sess.str_of(lib_ident);
+                let lib_name = match path_opt { // ???
+                    Some(p) => p, None => sess.str_of(lib_ident) };
                 match find_library_in_search_path(my_ctxt.sysroot_opt, lib_name) {
                     Some(installed_path) => {
                         debug!("It exists: %s", installed_path.to_str());
                     }
                     None => {
                         // Try to install it
-                        let pkg_id = PkgId::new(lib_name, &os::getcwd());
+                        let pkg_id = PkgId::new(lib_name);
                         my_ctxt.install(&my_workspace, &pkg_id);
                         // Also, add an additional search path
                         debug!("let installed_path...")
diff --git a/src/librustpkg/version.rs b/src/librustpkg/version.rs
index 88391850891..ab4f47ba69a 100644
--- a/src/librustpkg/version.rs
+++ b/src/librustpkg/version.rs
@@ -15,8 +15,8 @@ extern mod std;
 
 use extra::semver;
 use std::{char, os, result, run, str};
-use package_path::RemotePath;
 use extra::tempfile::mkdtemp;
+use path_util::rust_path;
 
 #[deriving(Clone)]
 pub enum Version {
@@ -92,19 +92,22 @@ pub fn parse_vers(vers: ~str) -> result::Result<semver::Version, ~str> {
     }
 }
 
-/// If `local_path` is a git repo, and the most recent tag in that repo denotes a version,
-/// return it; otherwise, `None`
+/// If `local_path` is a git repo in the RUST_PATH, and the most recent tag
+/// in that repo denotes a version, return it; otherwise, `None`
 pub fn try_getting_local_version(local_path: &Path) -> Option<Version> {
-    debug!("in try_getting_local_version");
-    let outp = run::process_output("git",
+    let rustpath = rust_path();
+    for rp in rustpath.iter() {
+        let local_path = rp.push_rel(local_path);
+        debug!("in try_getting_local_version");
+        let outp = run::process_output("git",
                                    [fmt!("--git-dir=%s", local_path.push(".git").to_str()),
                                     ~"tag", ~"-l"]);
 
-    debug!("git --git-dir=%s tag -l ~~~> %?", local_path.push(".git").to_str(), outp.status);
+        debug!("git --git-dir=%s tag -l ~~~> %?", local_path.push(".git").to_str(), outp.status);
 
-    if outp.status != 0 {
-        return None;
-    }
+        if outp.status != 0 {
+            loop;
+        }
 
     let mut output = None;
     let output_text = str::from_bytes(outp.output);
@@ -112,14 +115,19 @@ pub fn try_getting_local_version(local_path: &Path) -> Option<Version> {
         if !l.is_whitespace() {
             output = Some(l);
         }
+        match output.chain(try_parsing_version) {
+            Some(v) => return Some(v),
+            None    => ()
+        }
     }
-    output.chain(try_parsing_version)
+  }
+  None
 }
 
 /// If `remote_path` refers to a git repo that can be downloaded,
 /// and the most recent tag in that repo denotes a version, return it;
 /// otherwise, `None`
-pub fn try_getting_version(remote_path: &RemotePath) -> Option<Version> {
+pub fn try_getting_version(remote_path: &Path) -> Option<Version> {
     debug!("try_getting_version: %s", remote_path.to_str());
     if is_url_like(remote_path) {
         debug!("Trying to fetch its sources..");
@@ -190,7 +198,7 @@ fn try_parsing_version(s: &str) -> Option<Version> {
 }
 
 /// Just an approximation
-fn is_url_like(p: &RemotePath) -> bool {
+fn is_url_like(p: &Path) -> bool {
     let str = p.to_str();
     str.split_iter('/').len_() > 2
 }
diff --git a/src/librustpkg/workspace.rs b/src/librustpkg/workspace.rs
index d877b4ff489..3e0e08dfe2d 100644
--- a/src/librustpkg/workspace.rs
+++ b/src/librustpkg/workspace.rs
@@ -12,9 +12,11 @@
 
 use std::os;
 use std::path::Path;
-use path_util::{rust_path, workspace_contains_package_id};
+use path_util::workspace_contains_package_id;
 use package_id::PkgId;
 
+use rustc::metadata::filesearch::rust_path;
+
 pub fn each_pkg_parent_workspace(pkgid: &PkgId, action: &fn(&Path) -> bool) -> bool {
     // Using the RUST_PATH, find workspaces that contain
     // this package ID
@@ -23,7 +25,7 @@ pub fn each_pkg_parent_workspace(pkgid: &PkgId, action: &fn(&Path) -> bool) -> b
         // tjc: make this a condition
         fail!("Package %s not found in any of \
                     the following workspaces: %s",
-                   pkgid.remote_path.to_str(),
+                   pkgid.path.to_str(),
                    rust_path().to_str());
     }
     for ws in workspaces.iter() {
@@ -58,5 +60,5 @@ pub fn cwd_to_workspace() -> (Path, PkgId) {
     let ws = cwd.pop().pop();
     let cwd_ = cwd.clone();
     let pkgid = cwd_.components.last().to_str();
-    (ws, PkgId::new(pkgid, &cwd))
+    (ws, PkgId::new(pkgid))
 }
diff --git a/src/libstd/path.rs b/src/libstd/path.rs
index 76001ae4188..3e1cb50ce4e 100644
--- a/src/libstd/path.rs
+++ b/src/libstd/path.rs
@@ -19,13 +19,14 @@ Cross-platform file path handling
 use clone::Clone;
 use container::Container;
 use cmp::Eq;
-use iterator::{Iterator, IteratorUtil};
+use iterator::{Iterator, IteratorUtil, range};
 use libc;
+use num;
 use option::{None, Option, Some};
 use str::{OwnedStr, Str, StrSlice, StrVector};
 use to_str::ToStr;
 use ascii::{AsciiCast, AsciiStr};
-use vec::{OwnedVector, ImmutableVector};
+use vec::{OwnedVector, ImmutableVector, OwnedCopyableVector};
 
 #[cfg(windows)]
 pub use Path = self::WindowsPath;
@@ -124,6 +125,43 @@ pub trait GenericPath {
 
     /// True if `self` is an ancestor of `other`. See `test_is_ancestor_of` for examples
     fn is_ancestor_of(&self, (&Self)) -> bool;
+
+    /// Find the relative path from one file to another
+    fn get_relative_to(&self, abs2: (&Self)) -> Self {
+        assert!(self.is_absolute());
+        assert!(abs2.is_absolute());
+        let abs1 = self.normalize();
+        let abs2 = abs2.normalize();
+
+        let split1: &[~str] = abs1.components();
+        let split2: &[~str] = abs2.components();
+        let len1 = split1.len();
+        let len2 = split2.len();
+        assert!(len1 > 0);
+        assert!(len2 > 0);
+
+        let max_common_path = num::min(len1, len2) - 1;
+        let mut start_idx = 0;
+        while start_idx < max_common_path
+            && split1[start_idx] == split2[start_idx] {
+            start_idx += 1;
+        }
+
+        let mut path: ~[~str] = ~[];
+        for _ in range(start_idx, len1 - 1) { path.push(~".."); };
+
+        path.push_all(split2.slice(start_idx, len2 - 1));
+
+        let mut result: Self = GenericPath::from_str(".");
+        if !path.is_empty() {
+            // Without this type hint, the typechecker doesn't seem to like it
+            let p: Self = GenericPath::from_str("");
+            result = p.push_many(path);
+        };
+        result
+    }
+
+    fn components(self) -> ~[~str];
 }
 
 #[cfg(target_os = "linux")]
@@ -703,6 +741,7 @@ impl GenericPath for PosixPath {
              self.is_ancestor_of(&other.pop()))
     }
 
+   fn components(self) -> ~[~str] { self.components }
 }
 
 
@@ -985,6 +1024,8 @@ impl GenericPath for WindowsPath {
             (!other.components.is_empty() && !(self.components.is_empty() && !self.is_absolute) &&
              self.is_ancestor_of(&other.pop()))
     }
+
+   fn components(self) -> ~[~str] { self.components }
 }
 
 pub fn normalize(components: &[~str]) -> ~[~str] {
@@ -1341,4 +1382,124 @@ mod tests {
 
     }
 
+    #[test]
+    fn test_relative_to1() {
+        let p1 = PosixPath("/usr/bin/rustc");
+        let p2 = PosixPath("/usr/lib/mylib");
+        let res = p1.get_relative_to(&p2);
+        assert_eq!(res, PosixPath("../lib"));
+
+        let p1 = WindowsPath("C:\\usr\\bin\\rustc");
+        let p2 = WindowsPath("C:\\usr\\lib\\mylib");
+        let res = p1.get_relative_to(&p2);
+        assert_eq!(res, WindowsPath("..\\lib"));
+
+    }
+
+    #[test]
+    fn test_relative_to2() {
+        let p1 = PosixPath("/usr/bin/rustc");
+        let p2 = PosixPath("/usr/bin/../lib/mylib");
+        let res = p1.get_relative_to(&p2);
+        assert_eq!(res, PosixPath("../lib"));
+
+        let p1 = WindowsPath("C:\\usr\\bin\\rustc");
+        let p2 = WindowsPath("C:\\usr\\bin\\..\\lib\\mylib");
+        let res = p1.get_relative_to(&p2);
+        assert_eq!(res, WindowsPath("..\\lib"));
+    }
+
+    #[test]
+    fn test_relative_to3() {
+        let p1 = PosixPath("/usr/bin/whatever/rustc");
+        let p2 = PosixPath("/usr/lib/whatever/mylib");
+        let res = p1.get_relative_to(&p2);
+        assert_eq!(res, PosixPath("../../lib/whatever"));
+
+        let p1 = WindowsPath("C:\\usr\\bin\\whatever\\rustc");
+        let p2 = WindowsPath("C:\\usr\\lib\\whatever\\mylib");
+        let res = p1.get_relative_to(&p2);
+        assert_eq!(res, WindowsPath("..\\..\\lib\\whatever"));
+
+    }
+
+    #[test]
+    fn test_relative_to4() {
+        let p1 = PosixPath("/usr/bin/whatever/../rustc");
+        let p2 = PosixPath("/usr/lib/whatever/mylib");
+        let res = p1.get_relative_to(&p2);
+        assert_eq!(res, PosixPath("../lib/whatever"));
+
+        let p1 = WindowsPath("C:\\usr\\bin\\whatever\\..\\rustc");
+        let p2 = WindowsPath("C:\\usr\\lib\\whatever\\mylib");
+        let res = p1.get_relative_to(&p2);
+        assert_eq!(res, WindowsPath("..\\lib\\whatever"));
+
+    }
+
+    #[test]
+    fn test_relative_to5() {
+        let p1 = PosixPath("/usr/bin/whatever/../rustc");
+        let p2 = PosixPath("/usr/lib/whatever/../mylib");
+        let res = p1.get_relative_to(&p2);
+        assert_eq!(res, PosixPath("../lib"));
+
+        let p1 = WindowsPath("C:\\usr\\bin/whatever\\..\\rustc");
+        let p2 = WindowsPath("C:\\usr\\lib\\whatever\\..\\mylib");
+        let res = p1.get_relative_to(&p2);
+        assert_eq!(res, WindowsPath("..\\lib"));
+    }
+
+    #[test]
+    fn test_relative_to6() {
+        let p1 = PosixPath("/1");
+        let p2 = PosixPath("/2/3");
+        let res = p1.get_relative_to(&p2);
+        assert_eq!(res, PosixPath("2"));
+
+        let p1 = WindowsPath("C:\\1");
+        let p2 = WindowsPath("C:\\2\\3");
+        let res = p1.get_relative_to(&p2);
+        assert_eq!(res, WindowsPath("2"));
+
+    }
+
+    #[test]
+    fn test_relative_to7() {
+        let p1 = PosixPath("/1/2");
+        let p2 = PosixPath("/3");
+        let res = p1.get_relative_to(&p2);
+        assert_eq!(res, PosixPath(".."));
+
+        let p1 = WindowsPath("C:\\1\\2");
+        let p2 = WindowsPath("C:\\3");
+        let res = p1.get_relative_to(&p2);
+        assert_eq!(res, WindowsPath(".."));
+
+    }
+
+    #[test]
+    fn test_relative_to8() {
+        let p1 = PosixPath("/home/brian/Dev/rust/build/").push_rel(
+            &PosixPath("stage2/lib/rustc/i686-unknown-linux-gnu/lib/librustc.so"));
+        let p2 = PosixPath("/home/brian/Dev/rust/build/stage2/bin/..").push_rel(
+            &PosixPath("lib/rustc/i686-unknown-linux-gnu/lib/libstd.so"));
+        let res = p1.get_relative_to(&p2);
+        debug!("test_relative_to8: %s vs. %s",
+               res.to_str(),
+               PosixPath(".").to_str());
+        assert_eq!(res, PosixPath("."));
+
+        let p1 = WindowsPath("C:\\home\\brian\\Dev\\rust\\build\\").push_rel(
+            &WindowsPath("stage2\\lib\\rustc\\i686-unknown-linux-gnu\\lib\\librustc.so"));
+        let p2 = WindowsPath("\\home\\brian\\Dev\\rust\\build\\stage2\\bin\\..").push_rel(
+            &WindowsPath("lib\\rustc\\i686-unknown-linux-gnu\\lib\\libstd.so"));
+        let res = p1.get_relative_to(&p2);
+        debug!("test_relative_to8: %s vs. %s",
+               res.to_str(),
+               WindowsPath(".").to_str());
+        assert_eq!(res, WindowsPath("."));
+
+    }
+
 }
diff --git a/src/libsyntax/ast.rs b/src/libsyntax/ast.rs
index 435be3c71af..17247222c3f 100644
--- a/src/libsyntax/ast.rs
+++ b/src/libsyntax/ast.rs
@@ -951,7 +951,11 @@ pub struct view_item {
 
 #[deriving(Clone, Eq, Encodable, Decodable, IterBytes)]
 pub enum view_item_ {
-    view_item_extern_mod(ident, ~[@MetaItem], NodeId),
+    // ident: name used to refer to this crate in the code
+    // optional @str: if present, this is a location (containing
+    // arbitrary characters) from which to fetch the crate sources
+    // For example, extern mod whatever = "github.com/mozilla/rust"
+    view_item_extern_mod(ident, Option<@str>, ~[@MetaItem], NodeId),
     view_item_use(~[@view_path]),
 }
 
diff --git a/src/libsyntax/ast_util.rs b/src/libsyntax/ast_util.rs
index ba167fe6714..9a8a3bc25d8 100644
--- a/src/libsyntax/ast_util.rs
+++ b/src/libsyntax/ast_util.rs
@@ -419,7 +419,7 @@ impl Visitor<()> for IdVisitor {
 
     fn visit_view_item(@mut self, view_item: &view_item, env: ()) {
         match view_item.node {
-            view_item_extern_mod(_, _, node_id) => {
+            view_item_extern_mod(_, _, _, node_id) => {
                 (self.visit_callback)(node_id)
             }
             view_item_use(ref view_paths) => {
diff --git a/src/libsyntax/parse/parser.rs b/src/libsyntax/parse/parser.rs
index 7d6dce22fb7..ddb0e3bfa68 100644
--- a/src/libsyntax/parse/parser.rs
+++ b/src/libsyntax/parse/parser.rs
@@ -4181,8 +4181,16 @@ impl Parser {
                                  self.this_token_to_str()));
         }
 
-        let (sort, ident) = match *self.token {
-            token::IDENT(*) => (ast::named, self.parse_ident()),
+        let (sort, maybe_path, ident) = match *self.token {
+            token::IDENT(*) => {
+                let the_ident = self.parse_ident();
+                let path = if *self.token == token::EQ {
+                    self.bump();
+                    Some(self.parse_str())
+                }
+                else { None };
+                (ast::named, path, the_ident)
+            }
             _ => {
                 if must_be_named_mod {
                     self.span_fatal(*self.span,
@@ -4191,7 +4199,7 @@ impl Parser {
                                          self.this_token_to_str()));
                 }
 
-                (ast::anonymous,
+                (ast::anonymous, None,
                  special_idents::clownshoes_foreign_mod)
             }
         };
@@ -4230,7 +4238,7 @@ impl Parser {
         let metadata = self.parse_optional_meta();
         self.expect(&token::SEMI);
         iovi_view_item(ast::view_item {
-            node: view_item_extern_mod(ident, metadata, self.get_id()),
+            node: view_item_extern_mod(ident, maybe_path, metadata, self.get_id()),
             attrs: attrs,
             vis: visibility,
             span: mk_sp(lo, self.last_span.hi)
@@ -4812,8 +4820,13 @@ impl Parser {
         } else if self.eat_keyword(keywords::Extern) {
             self.expect_keyword(keywords::Mod);
             let ident = self.parse_ident();
+            let path = if *self.token == token::EQ {
+                self.bump();
+                Some(self.parse_str())
+            }
+            else { None };
             let metadata = self.parse_optional_meta();
-            view_item_extern_mod(ident, metadata, self.get_id())
+            view_item_extern_mod(ident, path, metadata, self.get_id())
         } else {
             self.bug("expected view item");
         };
diff --git a/src/libsyntax/print/pprust.rs b/src/libsyntax/print/pprust.rs
index f517179f603..ffe9575a864 100644
--- a/src/libsyntax/print/pprust.rs
+++ b/src/libsyntax/print/pprust.rs
@@ -1856,9 +1856,13 @@ pub fn print_view_item(s: @ps, item: &ast::view_item) {
     print_outer_attributes(s, item.attrs);
     print_visibility(s, item.vis);
     match item.node {
-        ast::view_item_extern_mod(id, ref mta, _) => {
+        ast::view_item_extern_mod(id, ref optional_path, ref mta, _) => {
             head(s, "extern mod");
             print_ident(s, id);
+            for p in optional_path.iter() {
+                word(s.s, "=");
+                print_string(s, *p);
+            }
             if !mta.is_empty() {
                 popen(s);
                 commasep(s, consistent, *mta, |p, &i| print_meta_item(p, i));
diff --git a/src/test/run-pass/extern-mod-url.rs b/src/test/run-pass/extern-mod-url.rs
deleted file mode 100644
index 363c54f6812..00000000000
--- a/src/test/run-pass/extern-mod-url.rs
+++ /dev/null
@@ -1,16 +0,0 @@
-// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-// Just a test that new-style extern mods parse
-
-// xfail-test FIXME #6407
-extern mod test = "github.com/catamorphism/test-pkg";
-
-fn main() {}