Rollup merge of #41608 - cuviper:distcheck-rust-src, r=alexcrichton

Add a distcheck for rust-src completeness

This is for the last commit of #41546.  For some reason, @bors only saw the first two commits, and wouldn't approve the last even when explicitly directed so.

r? @alexcrichton

src/bootstrap/check.rs

@@ -577,6 +577,7 @@ pub fn distcheck(build: &Build) {
         return
     }
 
+    println!("Distcheck");
     let dir = build.out.join("tmp").join("distcheck");
     let _ = fs::remove_dir_all(&dir);
     t!(fs::create_dir_all(&dir));
@@ -594,6 +595,26 @@ pub fn distcheck(build: &Build) {
     build.run(Command::new(build_helper::make(&build.config.build))
                      .arg("check")
                      .current_dir(&dir));
+
+    // Now make sure that rust-src has all of libstd's dependencies
+    println!("Distcheck rust-src");
+    let dir = build.out.join("tmp").join("distcheck-src");
+    let _ = fs::remove_dir_all(&dir);
+    t!(fs::create_dir_all(&dir));
+
+    let mut cmd = Command::new("tar");
+    cmd.arg("-xzf")
+       .arg(dist::rust_src_installer(build))
+       .arg("--strip-components=1")
+       .current_dir(&dir);
+    build.run(&mut cmd);
+
+    let toml = dir.join("rust-src/lib/rustlib/src/rust/src/libstd/Cargo.toml");
+    build.run(Command::new(&build.cargo)
+                     .arg("generate-lockfile")
+                     .arg("--manifest-path")
+                     .arg(&toml)
+                     .current_dir(&dir));
 }
 
 /// Test the build system itself

src/bootstrap/dist.rs

@@ -315,11 +315,18 @@ pub fn std(build: &Build, compiler: &Compiler, target: &str) {
     t!(fs::remove_dir_all(&image));
 }
 
+/// The path to the complete rustc-src tarball
 pub fn rust_src_location(build: &Build) -> PathBuf {
     let plain_name = format!("rustc-{}-src", build.rust_package_vers());
     distdir(build).join(&format!("{}.tar.gz", plain_name))
 }
 
+/// The path to the rust-src component installer
+pub fn rust_src_installer(build: &Build) -> PathBuf {
+    let name = pkgname(build, "rust-src");
+    distdir(build).join(&format!("{}.tar.gz", name))
+}
+
 /// Creates a tarball of save-analysis metadata, if available.
 pub fn analysis(build: &Build, compiler: &Compiler, target: &str) {
     assert!(build.config.extended);