Add a `DownloadSource` enum

This simplifies the arguments to `download_component` in config.rs.

It also moves stage0.json metadata handling to `Build::new`, making it easier to download the stage0
compiler in rustbuild later if necessary.

1 files changed, 18 insertions, 0 deletions

diff --git a/src/bootstrap/lib.rs b/src/bootstrap/lib.rs
index 4974a1c5b7b..022f2e0fc13 100644
--- a/src/bootstrap/lib.rs
+++ b/src/bootstrap/lib.rs
@@ -118,6 +118,7 @@ use std::os::windows::fs::symlink_file;
 
 use filetime::FileTime;
 use once_cell::sync::OnceCell;
+use serde::Deserialize;
 
 use crate::builder::Kind;
 use crate::config::{LlvmLibunwind, TargetSelection};
@@ -294,6 +295,7 @@ pub struct Build {
     targets: Vec<TargetSelection>,
 
     // Stage 0 (downloaded) compiler, lld and cargo or their local rust equivalents
+    stage0_metadata: Stage0Metadata,
     initial_rustc: PathBuf,
     initial_cargo: PathBuf,
     initial_lld: PathBuf,
@@ -320,6 +322,18 @@ pub struct Build {
     metrics: metrics::BuildMetrics,
 }
 
+#[derive(Deserialize)]
+struct Stage0Metadata {
+    dist_server: String,
+    checksums_sha256: HashMap<String, String>,
+    rustfmt: Option<RustfmtMetadata>,
+}
+#[derive(Deserialize)]
+struct RustfmtMetadata {
+    date: String,
+    version: String,
+}
+
 #[derive(Debug)]
 struct Crate {
     name: Interned<String>,
@@ -468,7 +482,11 @@ impl Build {
             bootstrap_out
         };
 
+        let stage0_json = t!(std::fs::read_to_string(&src.join("src").join("stage0.json")));
+        let stage0_metadata = t!(serde_json::from_str::<Stage0Metadata>(&stage0_json));
+
         let mut build = Build {
+            stage0_metadata,
             initial_rustc: config.initial_rustc.clone(),
             initial_cargo: config.initial_cargo.clone(),
             initial_lld,