1 files changed, 117 insertions, 0 deletions
diff --git a/src/tools/cargo/tests/testsuite/git_gc.rs b/src/tools/cargo/tests/testsuite/git_gc.rs
new file mode 100644
index 000000000..fd4fe30a9
--- /dev/null
+++ b/src/tools/cargo/tests/testsuite/git_gc.rs
@@ -0,0 +1,117 @@
+//! Tests for git garbage collection.
+
+use std::env;
+use std::ffi::OsStr;
+use std::path::PathBuf;
+
+use cargo_test_support::git;
+use cargo_test_support::git::cargo_uses_gitoxide;
+use cargo_test_support::paths;
+use cargo_test_support::project;
+use cargo_test_support::registry::Package;
+
+use url::Url;
+
+pub fn find_index() -> PathBuf {
+    let dir = paths::home().join(".cargo/registry/index");
+    dir.read_dir().unwrap().next().unwrap().unwrap().path()
+}
+
+fn run_test(path_env: Option<&OsStr>) {
+    const N: usize = 50;
+
+    let foo = project()
+        .file(
+            "Cargo.toml",
+            r#"
+                [package]
+                name = "foo"
+                version = "0.0.1"
+                authors = []
+
+                [dependencies]
+                bar = "*"
+            "#,
+        )
+        .file("src/lib.rs", "")
+        .build();
+    Package::new("bar", "0.1.0").publish();
+
+    foo.cargo("check").run();
+
+    let index = find_index();
+    let path = paths::home().join("tmp");
+    let url = Url::from_file_path(&path).unwrap().to_string();
+    let repo = git2::Repository::init(&path).unwrap();
+    let index = git2::Repository::open(&index).unwrap();
+    let mut cfg = repo.config().unwrap();
+    cfg.set_str("user.email", "foo@bar.com").unwrap();
+    cfg.set_str("user.name", "Foo Bar").unwrap();
+    let mut cfg = index.config().unwrap();
+    cfg.set_str("user.email", "foo@bar.com").unwrap();
+    cfg.set_str("user.name", "Foo Bar").unwrap();
+
+    for _ in 0..N {
+        git::commit(&repo);
+        index
+            .remote_anonymous(&url)
+            .unwrap()
+            .fetch(&["refs/heads/master:refs/remotes/foo/master"], None, None)
+            .unwrap();
+    }
+    drop((repo, index));
+    Package::new("bar", "0.1.1").publish();
+
+    let before = find_index()
+        .join(".git/objects/pack")
+        .read_dir()
+        .unwrap()
+        .count();
+    assert!(before > N);
+
+    let mut cmd = foo.cargo("update");
+    cmd.env("__CARGO_PACKFILE_LIMIT", "10");
+    if let Some(path) = path_env {
+        cmd.env("PATH", path);
+    }
+    cmd.env("CARGO_LOG", "trace");
+    cmd.run();
+    let after = find_index()
+        .join(".git/objects/pack")
+        .read_dir()
+        .unwrap()
+        .count();
+    assert!(
+        after < before,
+        "packfiles before: {}\n\
+         packfiles after:  {}",
+        before,
+        after
+    );
+}
+
+#[cargo_test(requires_git)]
+fn use_git_gc() {
+    run_test(None);
+}
+
+#[cargo_test]
+fn avoid_using_git() {
+    if cargo_uses_gitoxide() {
+        // file protocol without git binary is currently not possible - needs built-in upload-pack.
+        // See https://github.com/Byron/gitoxide/issues/734 (support for the file protocol) progress updates.
+        return;
+    }
+    let path = env::var_os("PATH").unwrap_or_default();
+    let mut paths = env::split_paths(&path).collect::<Vec<_>>();
+    let idx = paths
+        .iter()
+        .position(|p| p.join("git").exists() || p.join("git.exe").exists());
+    match idx {
+        Some(i) => {
+            paths.remove(i);
+        }
+        None => return,
+    }
+    run_test(Some(&env::join_paths(&paths).unwrap()));
+}