feat(test.rs): Clone only 1 layer in build_system

Author: tempdragon

build_system/src/test.rs

@@ -31,7 +31,10 @@ fn get_runners() -> Runners {
         "--test-failing-rustc",
         ("Run failing rustc tests", test_failing_rustc),
     );
-    runners.insert("--projects", ("Run the tests of popular crates", test_projects));
+    runners.insert(
+        "--projects",
+        ("Run the tests of popular crates", test_projects),
+    );
     runners.insert("--test-libcore", ("Run libcore tests", test_libcore));
     runners.insert("--clean", ("Empty cargo target directory", clean));
     runners.insert("--build-sysroot", ("Build sysroot", build_sysroot));
@@ -494,16 +497,32 @@ fn setup_rustc(env: &mut Env, args: &TestArg) -> Result<(), String> {
     let rust_dir = Some(Path::new("rust"));
     // If the repository was already cloned, command will fail, so doesn't matter.
     let _ = run_command_with_output_and_env(
-        &[&"git", &"clone", &"https://github.com/rust-lang/rust.git"],
+        &[
+            &"git",
+            &"clone",
+            &"https://github.com/rust-lang/rust.git",
+            &"--depth",
+            &"1",
+        ],
         None,
         Some(env),
     );
     run_command(&[&"git", &"checkout", &"--", &"tests/"], rust_dir)?;
-    run_command_with_output_and_env(&[&"git", &"fetch"], rust_dir, Some(env))?;
     let rustc_commit = match rustc_version_info(env.get("RUSTC").map(|s| s.as_str()))?.commit_hash {
         Some(commit_hash) => commit_hash,
         None => return Err("Couldn't retrieve rustc commit hash".to_string()),
     };
+    run_command_with_output_and_env(
+        &[
+            &"git",
+            &"fetch",
+            &"https://github.com/rust-lang/rust.git",
+            &rustc_commit.as_str(),
+            &"--depth=1",
+        ],
+        rust_dir,
+        Some(env),
+    )?;
     if rustc_commit != "unknown" {
         run_command_with_output_and_env(
             &[&"git", &"checkout", &rustc_commit],
@@ -703,7 +722,7 @@ fn test_projects(env: &Env, args: &TestArg) -> Result<(), String> {
         //"https://github.com/rust-lang/cargo", // TODO: very slow, only run on master?
     ];
 
-    let run_tests = |projects_path, iter: &mut dyn Iterator<Item=&&str>| -> Result<(), String> {
+    let run_tests = |projects_path, iter: &mut dyn Iterator<Item = &&str>| -> Result<(), String> {
         for project in iter {
             let clone_result = git_clone(project, Some(projects_path), true)?;
             let repo_path = Path::new(&clone_result.repo_dir);
@@ -727,8 +746,7 @@ fn test_projects(env: &Env, args: &TestArg) -> Result<(), String> {
         let start = current_part * count;
         // We remove the projects we don't want to test.
         run_tests(projects_path, &mut projects.iter().skip(start).take(count))?;
-    }
-    else {
+    } else {
         run_tests(projects_path, &mut projects.iter())?;
     }