Support specific revisions for pgo

Author: lnicola

src/tools/rust-analyzer/.github/workflows/release.yaml

@@ -29,10 +29,10 @@ jobs:
           - os: windows-latest
             target: x86_64-pc-windows-msvc
             code-target: win32-x64
-            pgo: clap-rs/clap
+            pgo: clap-rs/clap@v4.5.36
           - os: windows-latest
             target: i686-pc-windows-msvc
-            pgo: clap-rs/clap
+            pgo: clap-rs/clap@v4.5.36
           - os: windows-latest
             target: aarch64-pc-windows-msvc
             code-target: win32-arm64
@@ -42,24 +42,24 @@ jobs:
             # Zig is not used because it doesn't work with PGO
             container: quay.io/pypa/manylinux_2_28_x86_64
             code-target: linux-x64
-            pgo: clap-rs/clap
+            pgo: clap-rs/clap@v4.5.36
           - os: ubuntu-24.04-arm
             target: aarch64-unknown-linux-gnu
             container: quay.io/pypa/manylinux_2_28_aarch64
             code-target: linux-arm64
-            pgo: clap-rs/clap
+            pgo: clap-rs/clap@v4.5.36
           - os: ubuntu-latest
             target: arm-unknown-linux-gnueabihf
             zig_target: arm-unknown-linux-gnueabihf.2.28
             code-target: linux-armhf
           - os: macos-13
             target: x86_64-apple-darwin
             code-target: darwin-x64
-            pgo: clap-rs/clap
+            pgo: clap-rs/clap@v4.5.36
           - os: macos-14
             target: aarch64-apple-darwin
             code-target: darwin-arm64
-            pgo: clap-rs/clap
+            pgo: clap-rs/clap@v4.5.36
 
     name: dist (${{ matrix.target }})
     runs-on: ${{ matrix.os }}

src/tools/rust-analyzer/xtask/src/dist.rs

@@ -180,8 +180,8 @@ fn gather_pgo_profile<'a>(
 
     let (train_path, label) = match &train_crate {
         PgoTrainingCrate::RustAnalyzer => (PathBuf::from("."), "itself"),
-        PgoTrainingCrate::GitHub(url) => {
-            (download_crate_for_training(sh, &pgo_dir, url)?, url.as_str())
+        PgoTrainingCrate::GitHub(repo) => {
+            (download_crate_for_training(sh, &pgo_dir, repo)?, repo.as_str())
         }
     };
 
@@ -212,12 +212,20 @@ fn gather_pgo_profile<'a>(
 }
 
 /// Downloads a crate from GitHub, stores it into `pgo_dir` and returns a path to it.
-fn download_crate_for_training(sh: &Shell, pgo_dir: &Path, url: &str) -> anyhow::Result<PathBuf> {
-    let normalized_path = url.replace("/", "-");
+fn download_crate_for_training(sh: &Shell, pgo_dir: &Path, repo: &str) -> anyhow::Result<PathBuf> {
+    let mut it = repo.splitn(2, '@');
+    let repo = it.next().unwrap();
+    let revision = it.next();
+
+    // FIXME: switch to `--revision` here around 2035 or so
+    let revision =
+        if let Some(revision) = revision { &["--branch", revision] as &[&str] } else { &[] };
+
+    let normalized_path = repo.replace("/", "-");
     let target_path = pgo_dir.join(normalized_path);
-    cmd!(sh, "git clone --depth 1 https://github.com/{url} {target_path}")
+    cmd!(sh, "git clone --depth 1 https://github.com/{repo} {revision...} {target_path}")
         .run()
-        .with_context(|| "cannot download PGO training crate from {url}")?;
+        .with_context(|| "cannot download PGO training crate from {repo}")?;
 
     Ok(target_path)
 }