Rollup merge of #110188 - Nilstrieb:remove-remove-dir-all, r=jyn514

Remove orphaned remove_dir_all implementation from rust-installer

I have no idea why it's here, but it's not used at all.

r? Mark-Simulacrum

2 files changed, 0 insertions, 864 deletions

diff --git a/src/tools/rust-installer/Cargo.toml b/src/tools/rust-installer/Cargo.toml
index 788e556b0c6..97734f048ab 100644
--- a/src/tools/rust-installer/Cargo.toml
+++ b/src/tools/rust-installer/Cargo.toml
@@ -22,7 +22,3 @@ remove_dir_all = "0.5"
 [dependencies.clap]
 features = ["derive"]
 version = "3.1"
-
-[target."cfg(windows)".dependencies]
-lazy_static = "1"
-winapi = { version = "0.3", features = ["errhandlingapi", "handleapi", "ioapiset", "winerror", "winioctl", "winnt"] }
diff --git a/src/tools/rust-installer/src/remove_dir_all.rs b/src/tools/rust-installer/src/remove_dir_all.rs
deleted file mode 100644
index 11097652865..00000000000
--- a/src/tools/rust-installer/src/remove_dir_all.rs
+++ /dev/null
@@ -1,860 +0,0 @@
-#![allow(non_snake_case)]
-
-use std::io;
-use std::path::Path;
-
-#[cfg(not(windows))]
-pub fn remove_dir_all(path: &Path) -> io::Result<()> {
-    ::std::fs::remove_dir_all(path)
-}
-
-#[cfg(windows)]
-pub fn remove_dir_all(path: &Path) -> io::Result<()> {
-    win::remove_dir_all(path)
-}
-
-#[cfg(windows)]
-mod win {
-    use winapi::ctypes::{c_uint, c_ushort};
-    use winapi::shared::minwindef::{BOOL, DWORD, FALSE, FILETIME, LPVOID};
-    use winapi::shared::winerror::{
-        ERROR_CALL_NOT_IMPLEMENTED, ERROR_INSUFFICIENT_BUFFER, ERROR_NO_MORE_FILES,
-    };
-    use winapi::um::errhandlingapi::{GetLastError, SetLastError};
-    use winapi::um::fileapi::{
-        CreateFileW, FindFirstFileW, FindNextFileW, GetFileInformationByHandle,
-    };
-    use winapi::um::fileapi::{BY_HANDLE_FILE_INFORMATION, CREATE_ALWAYS, CREATE_NEW};
-    use winapi::um::fileapi::{FILE_BASIC_INFO, FILE_RENAME_INFO, TRUNCATE_EXISTING};
-    use winapi::um::fileapi::{OPEN_ALWAYS, OPEN_EXISTING};
-    use winapi::um::handleapi::{CloseHandle, INVALID_HANDLE_VALUE};
-    use winapi::um::ioapiset::DeviceIoControl;
-    use winapi::um::libloaderapi::{GetModuleHandleW, GetProcAddress};
-    use winapi::um::minwinbase::{
-        FileBasicInfo, FileRenameInfo, FILE_INFO_BY_HANDLE_CLASS, WIN32_FIND_DATAW,
-    };
-    use winapi::um::winbase::SECURITY_SQOS_PRESENT;
-    use winapi::um::winbase::{
-        FILE_FLAG_BACKUP_SEMANTICS, FILE_FLAG_DELETE_ON_CLOSE, FILE_FLAG_OPEN_REPARSE_POINT,
-    };
-    use winapi::um::winioctl::FSCTL_GET_REPARSE_POINT;
-    use winapi::um::winnt::{DELETE, FILE_ATTRIBUTE_DIRECTORY, HANDLE, LPCWSTR};
-    use winapi::um::winnt::{FILE_ATTRIBUTE_READONLY, FILE_ATTRIBUTE_REPARSE_POINT};
-    use winapi::um::winnt::{FILE_GENERIC_WRITE, FILE_WRITE_DATA, GENERIC_READ, GENERIC_WRITE};
-    use winapi::um::winnt::{FILE_READ_ATTRIBUTES, FILE_WRITE_ATTRIBUTES};
-    use winapi::um::winnt::{FILE_SHARE_DELETE, FILE_SHARE_READ, FILE_SHARE_WRITE};
-    use winapi::um::winnt::{IO_REPARSE_TAG_MOUNT_POINT, IO_REPARSE_TAG_SYMLINK, LARGE_INTEGER};
-
-    use std::ffi::{OsStr, OsString};
-    use std::io;
-    use std::mem;
-    use std::os::windows::ffi::{OsStrExt, OsStringExt};
-    use std::path::{Path, PathBuf};
-    use std::ptr;
-    use std::sync::Arc;
-
-    pub fn remove_dir_all(path: &Path) -> io::Result<()> {
-        // On Windows it is not enough to just recursively remove the contents of a
-        // directory and then the directory itself. Deleting does not happen
-        // instantaneously, but is scheduled.
-        // To work around this, we move the file or directory to some `base_dir`
-        // right before deletion to avoid races.
-        //
-        // As `base_dir` we choose the parent dir of the directory we want to
-        // remove. We very probably have permission to create files here, as we
-        // already need write permission in this dir to delete the directory. And it
-        // should be on the same volume.
-        //
-        // To handle files with names like `CON` and `morse .. .`, and when a
-        // directory structure is so deep it needs long path names the path is first
-        // converted to a `//?/`-path with `get_path()`.
-        //
-        // To make sure we don't leave a moved file laying around if the process
-        // crashes before we can delete the file, we do all operations on an file
-        // handle. By opening a file with `FILE_FLAG_DELETE_ON_CLOSE` Windows will
-        // always delete the file when the handle closes.
-        //
-        // All files are renamed to be in the `base_dir`, and have their name
-        // changed to "rm-<counter>". After every rename the counter is increased.
-        // Rename should not overwrite possibly existing files in the base dir. So
-        // if it fails with `AlreadyExists`, we just increase the counter and try
-        // again.
-        //
-        // For read-only files and directories we first have to remove the read-only
-        // attribute before we can move or delete them. This also removes the
-        // attribute from possible hardlinks to the file, so just before closing we
-        // restore the read-only attribute.
-        //
-        // If 'path' points to a directory symlink or junction we should not
-        // recursively remove the target of the link, but only the link itself.
-        //
-        // Moving and deleting is guaranteed to succeed if we are able to open the
-        // file with `DELETE` permission. If others have the file open we only have
-        // `DELETE` permission if they have specified `FILE_SHARE_DELETE`. We can
-        // also delete the file now, but it will not disappear until all others have
-        // closed the file. But no-one can open the file after we have flagged it
-        // for deletion.
-
-        // Open the path once to get the canonical path, file type and attributes.
-        let (path, metadata) = {
-            let mut opts = OpenOptions::new();
-            opts.access_mode(FILE_READ_ATTRIBUTES);
-            opts.custom_flags(FILE_FLAG_BACKUP_SEMANTICS | FILE_FLAG_OPEN_REPARSE_POINT);
-            let file = File::open(path, &opts)?;
-            (get_path(&file)?, file.file_attr()?)
-        };
-
-        let mut ctx = RmdirContext {
-            base_dir: match path.parent() {
-                Some(dir) => dir,
-                None => {
-                    return Err(io::Error::new(
-                        io::ErrorKind::PermissionDenied,
-                        "can't delete root directory",
-                    ))
-                }
-            },
-            readonly: metadata.perm().readonly(),
-            counter: 0,
-        };
-
-        let filetype = metadata.file_type();
-        if filetype.is_dir() {
-            remove_dir_all_recursive(path.as_ref(), &mut ctx)
-        } else if filetype.is_symlink_dir() {
-            remove_item(path.as_ref(), &mut ctx)
-        } else {
-            Err(io::Error::new(
-                io::ErrorKind::PermissionDenied,
-                "Not a directory",
-            ))
-        }
-    }
-
-    fn readdir(p: &Path) -> io::Result<ReadDir> {
-        let root = p.to_path_buf();
-        let star = p.join("*");
-        let path = to_u16s(&star)?;
-
-        unsafe {
-            let mut wfd = mem::zeroed();
-            let find_handle = FindFirstFileW(path.as_ptr(), &mut wfd);
-            if find_handle != INVALID_HANDLE_VALUE {
-                Ok(ReadDir {
-                    handle: FindNextFileHandle(find_handle),
-                    root: Arc::new(root),
-                    first: Some(wfd),
-                })
-            } else {
-                Err(io::Error::last_os_error())
-            }
-        }
-    }
-
-    struct RmdirContext<'a> {
-        base_dir: &'a Path,
-        readonly: bool,
-        counter: u64,
-    }
-
-    fn remove_dir_all_recursive(path: &Path, ctx: &mut RmdirContext) -> io::Result<()> {
-        let dir_readonly = ctx.readonly;
-        for child in readdir(path)? {
-            let child = child?;
-            let child_type = child.file_type()?;
-            ctx.readonly = child.metadata()?.perm().readonly();
-            if child_type.is_dir() {
-                remove_dir_all_recursive(&child.path(), ctx)?;
-            } else {
-                remove_item(&child.path().as_ref(), ctx)?;
-            }
-        }
-        ctx.readonly = dir_readonly;
-        remove_item(path, ctx)
-    }
-
-    fn remove_item(path: &Path, ctx: &mut RmdirContext) -> io::Result<()> {
-        if !ctx.readonly {
-            let mut opts = OpenOptions::new();
-            opts.access_mode(DELETE);
-            opts.custom_flags(
-                FILE_FLAG_BACKUP_SEMANTICS | // delete directory
-                              FILE_FLAG_OPEN_REPARSE_POINT | // delete symlink
-                              FILE_FLAG_DELETE_ON_CLOSE,
-            );
-            let file = File::open(path, &opts)?;
-            move_item(&file, ctx)
-        } else {
-            // remove read-only permision
-            set_perm(&path, FilePermissions::new())?;
-            // move and delete file, similar to !readonly.
-            // only the access mode is different.
-            let mut opts = OpenOptions::new();
-            opts.access_mode(DELETE | FILE_WRITE_ATTRIBUTES);
-            opts.custom_flags(
-                FILE_FLAG_BACKUP_SEMANTICS
-                    | FILE_FLAG_OPEN_REPARSE_POINT
-                    | FILE_FLAG_DELETE_ON_CLOSE,
-            );
-            let file = File::open(path, &opts)?;
-            move_item(&file, ctx)?;
-            // restore read-only flag just in case there are other hard links
-            let mut perm = FilePermissions::new();
-            perm.set_readonly(true);
-            let _ = file.set_perm(perm); // ignore if this fails
-            Ok(())
-        }
-    }
-
-    macro_rules! compat_fn {
-        ($module:ident: $(
-            fn $symbol:ident($($argname:ident: $argtype:ty),*)
-                             -> $rettype:ty {
-                $($body:expr);*
-            }
-        )*) => ($(
-            #[allow(unused_variables)]
-            unsafe fn $symbol($($argname: $argtype),*) -> $rettype {
-                use std::sync::atomic::{AtomicUsize, Ordering};
-                use std::mem;
-                use std::ffi::CString;
-                type F = unsafe extern "system" fn($($argtype),*) -> $rettype;
-
-                lazy_static! { static ref PTR: AtomicUsize = AtomicUsize::new(0);}
-
-                fn lookup(module: &str, symbol: &str) -> Option<usize> {
-                    let mut module: Vec<u16> = module.encode_utf16().collect();
-                    module.push(0);
-                    let symbol = CString::new(symbol).unwrap();
-                    unsafe {
-                        let handle = GetModuleHandleW(module.as_ptr());
-                        match GetProcAddress(handle, symbol.as_ptr()) as usize {
-                            0 => None,
-                            n => Some(n),
-                        }
-                    }
-                }
-
-                fn store_func(ptr: &AtomicUsize, module: &str, symbol: &str,
-                              fallback: usize) -> usize {
-                    let value = lookup(module, symbol).unwrap_or(fallback);
-                    ptr.store(value, Ordering::SeqCst);
-                    value
-                }
-
-                fn load() -> usize {
-                    store_func(&PTR, stringify!($module), stringify!($symbol), fallback as usize)
-                }
-                unsafe extern "system" fn fallback($($argname: $argtype),*)
-                                                   -> $rettype {
-                    $($body);*
-                }
-
-                let addr = match PTR.load(Ordering::SeqCst) {
-                    0 => load(),
-                    n => n,
-                };
-                mem::transmute::<usize, F>(addr)($($argname),*)
-            }
-        )*)
-    }
-
-    compat_fn! {
-        kernel32:
-        fn GetFinalPathNameByHandleW(_hFile: HANDLE,
-                                     _lpszFilePath: LPCWSTR,
-                                     _cchFilePath: DWORD,
-                                     _dwFlags: DWORD) -> DWORD {
-            SetLastError(ERROR_CALL_NOT_IMPLEMENTED as DWORD); 0
-        }
-        fn SetFileInformationByHandle(_hFile: HANDLE,
-                                      _FileInformationClass: FILE_INFO_BY_HANDLE_CLASS,
-                                      _lpFileInformation: LPVOID,
-                                      _dwBufferSize: DWORD) -> BOOL {
-            SetLastError(ERROR_CALL_NOT_IMPLEMENTED as DWORD); 0
-        }
-    }
-
-    fn cvt(i: i32) -> io::Result<i32> {
-        if i == 0 {
-            Err(io::Error::last_os_error())
-        } else {
-            Ok(i)
-        }
-    }
-
-    fn to_u16s<S: AsRef<OsStr>>(s: S) -> io::Result<Vec<u16>> {
-        fn inner(s: &OsStr) -> io::Result<Vec<u16>> {
-            let mut maybe_result: Vec<u16> = s.encode_wide().collect();
-            if maybe_result.iter().any(|&u| u == 0) {
-                return Err(io::Error::new(
-                    io::ErrorKind::InvalidInput,
-                    "strings passed to WinAPI cannot contain NULs",
-                ));
-            }
-            maybe_result.push(0);
-            Ok(maybe_result)
-        }
-        inner(s.as_ref())
-    }
-
-    fn truncate_utf16_at_nul<'a>(v: &'a [u16]) -> &'a [u16] {
-        match v.iter().position(|c| *c == 0) {
-            // don't include the 0
-            Some(i) => &v[..i],
-            None => v,
-        }
-    }
-
-    fn fill_utf16_buf<F1, F2, T>(mut f1: F1, f2: F2) -> io::Result<T>
-    where
-        F1: FnMut(*mut u16, DWORD) -> DWORD,
-        F2: FnOnce(&[u16]) -> T,
-    {
-        // Start off with a stack buf but then spill over to the heap if we end up
-        // needing more space.
-        let mut stack_buf = [0u16; 512];
-        let mut heap_buf = Vec::new();
-        unsafe {
-            let mut n = stack_buf.len();
-            loop {
-                let buf = if n <= stack_buf.len() {
-                    &mut stack_buf[..]
-                } else {
-                    let extra = n - heap_buf.len();
-                    heap_buf.reserve(extra);
-                    heap_buf.set_len(n);
-                    &mut heap_buf[..]
-                };
-
-                // This function is typically called on windows API functions which
-                // will return the correct length of the string, but these functions
-                // also return the `0` on error. In some cases, however, the
-                // returned "correct length" may actually be 0!
-                //
-                // To handle this case we call `SetLastError` to reset it to 0 and
-                // then check it again if we get the "0 error value". If the "last
-                // error" is still 0 then we interpret it as a 0 length buffer and
-                // not an actual error.
-                SetLastError(0);
-                let k = match f1(buf.as_mut_ptr(), n as DWORD) {
-                    0 if GetLastError() == 0 => 0,
-                    0 => return Err(io::Error::last_os_error()),
-                    n => n,
-                } as usize;
-                if k == n && GetLastError() == ERROR_INSUFFICIENT_BUFFER {
-                    n *= 2;
-                } else if k >= n {
-                    n = k;
-                } else {
-                    return Ok(f2(&buf[..k]));
-                }
-            }
-        }
-    }
-
-    #[derive(Clone, PartialEq, Eq, Debug, Default)]
-    struct FilePermissions {
-        readonly: bool,
-    }
-
-    impl FilePermissions {
-        fn new() -> FilePermissions {
-            Default::default()
-        }
-        fn readonly(&self) -> bool {
-            self.readonly
-        }
-        fn set_readonly(&mut self, readonly: bool) {
-            self.readonly = readonly
-        }
-    }
-
-    #[derive(Clone)]
-    struct OpenOptions {
-        // generic
-        read: bool,
-        write: bool,
-        append: bool,
-        truncate: bool,
-        create: bool,
-        create_new: bool,
-        // system-specific
-        custom_flags: u32,
-        access_mode: Option<DWORD>,
-        attributes: DWORD,
-        share_mode: DWORD,
-        security_qos_flags: DWORD,
-        security_attributes: usize, // FIXME: should be a reference
-    }
-
-    impl OpenOptions {
-        fn new() -> OpenOptions {
-            OpenOptions {
-                // generic
-                read: false,
-                write: false,
-                append: false,
-                truncate: false,
-                create: false,
-                create_new: false,
-                // system-specific
-                custom_flags: 0,
-                access_mode: None,
-                share_mode: FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
-                attributes: 0,
-                security_qos_flags: 0,
-                security_attributes: 0,
-            }
-        }
-        fn custom_flags(&mut self, flags: u32) {
-            self.custom_flags = flags;
-        }
-        fn access_mode(&mut self, access_mode: u32) {
-            self.access_mode = Some(access_mode);
-        }
-
-        fn get_access_mode(&self) -> io::Result<DWORD> {
-            const ERROR_INVALID_PARAMETER: i32 = 87;
-
-            match (self.read, self.write, self.append, self.access_mode) {
-                (_, _, _, Some(mode)) => Ok(mode),
-                (true, false, false, None) => Ok(GENERIC_READ),
-                (false, true, false, None) => Ok(GENERIC_WRITE),
-                (true, true, false, None) => Ok(GENERIC_READ | GENERIC_WRITE),
-                (false, _, true, None) => Ok(FILE_GENERIC_WRITE & !FILE_WRITE_DATA),
-                (true, _, true, None) => Ok(GENERIC_READ | (FILE_GENERIC_WRITE & !FILE_WRITE_DATA)),
-                (false, false, false, None) => {
-                    Err(io::Error::from_raw_os_error(ERROR_INVALID_PARAMETER))
-                }
-            }
-        }
-
-        fn get_creation_mode(&self) -> io::Result<DWORD> {
-            const ERROR_INVALID_PARAMETER: i32 = 87;
-
-            match (self.write, self.append) {
-                (true, false) => {}
-                (false, false) => {
-                    if self.truncate || self.create || self.create_new {
-                        return Err(io::Error::from_raw_os_error(ERROR_INVALID_PARAMETER));
-                    }
-                }
-                (_, true) => {
-                    if self.truncate && !self.create_new {
-                        return Err(io::Error::from_raw_os_error(ERROR_INVALID_PARAMETER));
-                    }
-                }
-            }
-
-            Ok(match (self.create, self.truncate, self.create_new) {
-                (false, false, false) => OPEN_EXISTING,
-                (true, false, false) => OPEN_ALWAYS,
-                (false, true, false) => TRUNCATE_EXISTING,
-                (true, true, false) => CREATE_ALWAYS,
-                (_, _, true) => CREATE_NEW,
-            })
-        }
-
-        fn get_flags_and_attributes(&self) -> DWORD {
-            self.custom_flags
-                | self.attributes
-                | self.security_qos_flags
-                | if self.security_qos_flags != 0 {
-                    SECURITY_SQOS_PRESENT
-                } else {
-                    0
-                }
-                | if self.create_new {
-                    FILE_FLAG_OPEN_REPARSE_POINT
-                } else {
-                    0
-                }
-        }
-    }
-
-    struct File {
-        handle: Handle,
-    }
-
-    impl File {
-        fn open(path: &Path, opts: &OpenOptions) -> io::Result<File> {
-            let path = to_u16s(path)?;
-            let handle = unsafe {
-                CreateFileW(
-                    path.as_ptr(),
-                    opts.get_access_mode()?,
-                    opts.share_mode,
-                    opts.security_attributes as *mut _,
-                    opts.get_creation_mode()?,
-                    opts.get_flags_and_attributes(),
-                    ptr::null_mut(),
-                )
-            };
-            if handle == INVALID_HANDLE_VALUE {
-                Err(io::Error::last_os_error())
-            } else {
-                Ok(File {
-                    handle: Handle::new(handle),
-                })
-            }
-        }
-
-        fn file_attr(&self) -> io::Result<FileAttr> {
-            unsafe {
-                let mut info: BY_HANDLE_FILE_INFORMATION = mem::zeroed();
-                cvt(GetFileInformationByHandle(self.handle.raw(), &mut info))?;
-                let mut attr = FileAttr {
-                    attributes: info.dwFileAttributes,
-                    creation_time: info.ftCreationTime,
-                    last_access_time: info.ftLastAccessTime,
-                    last_write_time: info.ftLastWriteTime,
-                    file_size: ((info.nFileSizeHigh as u64) << 32) | (info.nFileSizeLow as u64),
-                    reparse_tag: 0,
-                };
-                if attr.is_reparse_point() {
-                    let mut b = [0; MAXIMUM_REPARSE_DATA_BUFFER_SIZE];
-                    if let Ok((_, buf)) = self.reparse_point(&mut b) {
-                        attr.reparse_tag = buf.ReparseTag;
-                    }
-                }
-                Ok(attr)
-            }
-        }
-
-        fn set_attributes(&self, attr: DWORD) -> io::Result<()> {
-            let zero: LARGE_INTEGER = unsafe { mem::zeroed() };
-
-            let mut info = FILE_BASIC_INFO {
-                CreationTime: zero,   // do not change
-                LastAccessTime: zero, // do not change
-                LastWriteTime: zero,  // do not change
-                ChangeTime: zero,     // do not change
-                FileAttributes: attr,
-            };
-            let size = mem::size_of_val(&info);
-            cvt(unsafe {
-                SetFileInformationByHandle(
-                    self.handle.raw(),
-                    FileBasicInfo,
-                    &mut info as *mut _ as *mut _,
-                    size as DWORD,
-                )
-            })?;
-            Ok(())
-        }
-
-        fn rename(&self, new: &Path, replace: bool) -> io::Result<()> {
-            // &self must be opened with DELETE permission
-            use std::iter;
-            #[cfg(target_arch = "x86")]
-            const STRUCT_SIZE: usize = 12;
-            #[cfg(target_arch = "x86_64")]
-            const STRUCT_SIZE: usize = 20;
-
-            // FIXME: check for internal NULs in 'new'
-            let mut data: Vec<u16> = iter::repeat(0u16)
-                .take(STRUCT_SIZE / 2)
-                .chain(new.as_os_str().encode_wide())
-                .collect();
-            data.push(0);
-            let size = data.len() * 2;
-
-            unsafe {
-                // Thanks to alignment guarantees on Windows this works
-                // (8 for 32-bit and 16 for 64-bit)
-                let info = data.as_mut_ptr() as *mut FILE_RENAME_INFO;
-                // The type of ReplaceIfExists is BOOL, but it actually expects a
-                // BOOLEAN. This means true is -1, not c::TRUE.
-                (*info).ReplaceIfExists = if replace { -1 } else { FALSE };
-                (*info).RootDirectory = ptr::null_mut();
-                (*info).FileNameLength = (size - STRUCT_SIZE) as DWORD;
-                cvt(SetFileInformationByHandle(
-                    self.handle().raw(),
-                    FileRenameInfo,
-                    data.as_mut_ptr() as *mut _ as *mut _,
-                    size as DWORD,
-                ))?;
-                Ok(())
-            }
-        }
-        fn set_perm(&self, perm: FilePermissions) -> io::Result<()> {
-            let attr = self.file_attr()?.attributes;
-            if perm.readonly == (attr & FILE_ATTRIBUTE_READONLY != 0) {
-                Ok(())
-            } else if perm.readonly {
-                self.set_attributes(attr | FILE_ATTRIBUTE_READONLY)
-            } else {
-                self.set_attributes(attr & !FILE_ATTRIBUTE_READONLY)
-            }
-        }
-
-        fn handle(&self) -> &Handle {
-            &self.handle
-        }
-
-        fn reparse_point<'a>(
-            &self,
-            space: &'a mut [u8; MAXIMUM_REPARSE_DATA_BUFFER_SIZE],
-        ) -> io::Result<(DWORD, &'a REPARSE_DATA_BUFFER)> {
-            unsafe {
-                let mut bytes = 0;
-                cvt({
-                    DeviceIoControl(
-                        self.handle.raw(),
-                        FSCTL_GET_REPARSE_POINT,
-                        ptr::null_mut(),
-                        0,
-                        space.as_mut_ptr() as *mut _,
-                        space.len() as DWORD,
-                        &mut bytes,
-                        ptr::null_mut(),
-                    )
-                })?;
-                Ok((bytes, &*(space.as_ptr() as *const REPARSE_DATA_BUFFER)))
-            }
-        }
-    }
-
-    #[derive(Copy, Clone, PartialEq, Eq, Hash)]
-    enum FileType {
-        Dir,
-        File,
-        SymlinkFile,
-        SymlinkDir,
-        ReparsePoint,
-        MountPoint,
-    }
-
-    impl FileType {
-        fn new(attrs: DWORD, reparse_tag: DWORD) -> FileType {
-            match (
-                attrs & FILE_ATTRIBUTE_DIRECTORY != 0,
-                attrs & FILE_ATTRIBUTE_REPARSE_POINT != 0,
-                reparse_tag,
-            ) {
-                (false, false, _) => FileType::File,
-                (true, false, _) => FileType::Dir,
-                (false, true, IO_REPARSE_TAG_SYMLINK) => FileType::SymlinkFile,
-                (true, true, IO_REPARSE_TAG_SYMLINK) => FileType::SymlinkDir,
-                (true, true, IO_REPARSE_TAG_MOUNT_POINT) => FileType::MountPoint,
-                (_, true, _) => FileType::ReparsePoint,
-                // Note: if a _file_ has a reparse tag of the type IO_REPARSE_TAG_MOUNT_POINT it is
-                // invalid, as junctions always have to be dirs. We set the filetype to ReparsePoint
-                // to indicate it is something symlink-like, but not something you can follow.
-            }
-        }
-
-        fn is_dir(&self) -> bool {
-            *self == FileType::Dir
-        }
-        fn is_symlink_dir(&self) -> bool {
-            *self == FileType::SymlinkDir || *self == FileType::MountPoint
-        }
-    }
-
-    impl DirEntry {
-        fn new(root: &Arc<PathBuf>, wfd: &WIN32_FIND_DATAW) -> Option<DirEntry> {
-            let first_bytes = &wfd.cFileName[0..3];
-            if first_bytes.starts_with(&[46, 0]) || first_bytes.starts_with(&[46, 46, 0]) {
-                None
-            } else {
-                Some(DirEntry {
-                    root: root.clone(),
-                    data: *wfd,
-                })
-            }
-        }
-
-        fn path(&self) -> PathBuf {
-            self.root.join(&self.file_name())
-        }
-
-        fn file_name(&self) -> OsString {
-            let filename = truncate_utf16_at_nul(&self.data.cFileName);
-            OsString::from_wide(filename)
-        }
-
-        fn file_type(&self) -> io::Result<FileType> {
-            Ok(FileType::new(
-                self.data.dwFileAttributes,
-                /* reparse_tag = */ self.data.dwReserved0,
-            ))
-        }
-
-        fn metadata(&self) -> io::Result<FileAttr> {
-            Ok(FileAttr {
-                attributes: self.data.dwFileAttributes,
-                creation_time: self.data.ftCreationTime,
-                last_access_time: self.data.ftLastAccessTime,
-                last_write_time: self.data.ftLastWriteTime,
-                file_size: ((self.data.nFileSizeHigh as u64) << 32)
-                    | (self.data.nFileSizeLow as u64),
-                reparse_tag: if self.data.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT != 0 {
-                    // reserved unless this is a reparse point
-                    self.data.dwReserved0
-                } else {
-                    0
-                },
-            })
-        }
-    }
-
-    struct DirEntry {
-        root: Arc<PathBuf>,
-        data: WIN32_FIND_DATAW,
-    }
-
-    struct ReadDir {
-        handle: FindNextFileHandle,
-        root: Arc<PathBuf>,
-        first: Option<WIN32_FIND_DATAW>,
-    }
-
-    impl Iterator for ReadDir {
-        type Item = io::Result<DirEntry>;
-        fn next(&mut self) -> Option<io::Result<DirEntry>> {
-            if let Some(first) = self.first.take() {
-                if let Some(e) = DirEntry::new(&self.root, &first) {
-                    return Some(Ok(e));
-                }
-            }
-            unsafe {
-                let mut wfd = mem::zeroed();
-                loop {
-                    if FindNextFileW(self.handle.0, &mut wfd) == 0 {
-                        if GetLastError() == ERROR_NO_MORE_FILES {
-                            return None;
-                        } else {
-                            return Some(Err(io::Error::last_os_error()));
-                        }
-                    }
-                    if let Some(e) = DirEntry::new(&self.root, &wfd) {
-                        return Some(Ok(e));
-                    }
-                }
-            }
-        }
-    }
-
-    #[derive(Clone)]
-    struct FileAttr {
-        attributes: DWORD,
-        creation_time: FILETIME,
-        last_access_time: FILETIME,
-        last_write_time: FILETIME,
-        file_size: u64,
-        reparse_tag: DWORD,
-    }
-
-    impl FileAttr {
-        fn perm(&self) -> FilePermissions {
-            FilePermissions {
-                readonly: self.attributes & FILE_ATTRIBUTE_READONLY != 0,
-            }
-        }
-
-        fn file_type(&self) -> FileType {
-            FileType::new(self.attributes, self.reparse_tag)
-        }
-
-        fn is_reparse_point(&self) -> bool {
-            self.attributes & FILE_ATTRIBUTE_REPARSE_POINT != 0
-        }
-    }
-
-    #[repr(C)]
-    struct REPARSE_DATA_BUFFER {
-        ReparseTag: c_uint,
-        ReparseDataLength: c_ushort,
-        Reserved: c_ushort,
-        rest: (),
-    }
-
-    const MAXIMUM_REPARSE_DATA_BUFFER_SIZE: usize = 16 * 1024;
-
-    /// An owned container for `HANDLE` object, closing them on Drop.
-    ///
-    /// All methods are inherited through a `Deref` impl to `RawHandle`
-    struct Handle(RawHandle);
-
-    use std::ops::Deref;
-
-    /// A wrapper type for `HANDLE` objects to give them proper Send/Sync inference
-    /// as well as Rust-y methods.
-    ///
-    /// This does **not** drop the handle when it goes out of scope, use `Handle`
-    /// instead for that.
-    #[derive(Copy, Clone)]
-    struct RawHandle(HANDLE);
-
-    unsafe impl Send for RawHandle {}
-    unsafe impl Sync for RawHandle {}
-
-    impl Handle {
-        fn new(handle: HANDLE) -> Handle {
-            Handle(RawHandle::new(handle))
-        }
-    }
-
-    impl Deref for Handle {
-        type Target = RawHandle;
-        fn deref(&self) -> &RawHandle {
-            &self.0
-        }
-    }
-
-    impl Drop for Handle {
-        fn drop(&mut self) {
-            unsafe {
-                let _ = CloseHandle(self.raw());
-            }
-        }
-    }
-
-    impl RawHandle {
-        fn new(handle: HANDLE) -> RawHandle {
-            RawHandle(handle)
-        }
-
-        fn raw(&self) -> HANDLE {
-            self.0
-        }
-    }
-
-    struct FindNextFileHandle(HANDLE);
-
-    fn get_path(f: &File) -> io::Result<PathBuf> {
-        fill_utf16_buf(
-            |buf, sz| unsafe {
-                GetFinalPathNameByHandleW(f.handle.raw(), buf, sz, VOLUME_NAME_DOS)
-            },
-            |buf| PathBuf::from(OsString::from_wide(buf)),
-        )
-    }
-
-    fn move_item(file: &File, ctx: &mut RmdirContext) -> io::Result<()> {
-        let mut tmpname = ctx.base_dir.join(format! {"rm-{}", ctx.counter});
-        ctx.counter += 1;
-        // Try to rename the file. If it already exists, just retry with an other
-        // filename.
-        while let Err(err) = file.rename(tmpname.as_ref(), false) {
-            if err.kind() != io::ErrorKind::AlreadyExists {
-                return Err(err);
-            };
-            tmpname = ctx.base_dir.join(format!("rm-{}", ctx.counter));
-            ctx.counter += 1;
-        }
-        Ok(())
-    }
-
-    fn set_perm(path: &Path, perm: FilePermissions) -> io::Result<()> {
-        let mut opts = OpenOptions::new();
-        opts.access_mode(FILE_READ_ATTRIBUTES | FILE_WRITE_ATTRIBUTES);
-        opts.custom_flags(FILE_FLAG_BACKUP_SEMANTICS);
-        let file = File::open(path, &opts)?;
-        file.set_perm(perm)
-    }
-
-    const VOLUME_NAME_DOS: DWORD = 0x0;
-}