crates/evaluator: eval loop with git polling and nix-eval-jobs integration

Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: I291a411b1b06cf821e09f3d5a61403196a6a6964

crates/evaluator/tests/git_tests.rs

@@ -0,0 +1,86 @@
+//! Tests for the git clone/fetch module.
+//! Uses git2 to create a temporary repository, then exercises clone_or_fetch.
+
+use git2::{Repository, Signature};
+use tempfile::TempDir;
+
+#[test]
+fn test_clone_or_fetch_clones_new_repo() {
+    let upstream_dir = TempDir::new().unwrap();
+    let work_dir = TempDir::new().unwrap();
+
+    // Create a non-bare repo to clone from (bare repos have no HEAD by default)
+    let upstream = Repository::init(upstream_dir.path()).unwrap();
+    // Create initial commit
+    {
+        let sig = Signature::now("Test", "test@example.com").unwrap();
+        let tree_id = upstream.index().unwrap().write_tree().unwrap();
+        let tree = upstream.find_tree(tree_id).unwrap();
+        upstream
+            .commit(Some("HEAD"), &sig, &sig, "initial", &tree, &[])
+            .unwrap();
+    }
+
+    let url = format!("file://{}", upstream_dir.path().display());
+    let result = fc_evaluator::git::clone_or_fetch(&url, work_dir.path(), "test-project");
+
+    assert!(
+        result.is_ok(),
+        "clone_or_fetch should succeed: {:?}",
+        result.err()
+    );
+    let (repo_path, hash): (std::path::PathBuf, String) = result.unwrap();
+    assert!(repo_path.exists());
+    assert!(!hash.is_empty());
+    assert_eq!(hash.len(), 40); // full SHA-1
+}
+
+#[test]
+fn test_clone_or_fetch_fetches_existing() {
+    let upstream_dir = TempDir::new().unwrap();
+    let work_dir = TempDir::new().unwrap();
+
+    let upstream = Repository::init(upstream_dir.path()).unwrap();
+    {
+        let sig = Signature::now("Test", "test@example.com").unwrap();
+        let tree_id = upstream.index().unwrap().write_tree().unwrap();
+        let tree = upstream.find_tree(tree_id).unwrap();
+        upstream
+            .commit(Some("HEAD"), &sig, &sig, "initial", &tree, &[])
+            .unwrap();
+    }
+
+    let url = format!("file://{}", upstream_dir.path().display());
+
+    // First clone
+    let (_, hash1): (std::path::PathBuf, String) =
+        fc_evaluator::git::clone_or_fetch(&url, work_dir.path(), "test-project")
+            .expect("first clone failed");
+
+    // Make another commit upstream
+    {
+        let sig = Signature::now("Test", "test@example.com").unwrap();
+        let tree_id = upstream.index().unwrap().write_tree().unwrap();
+        let tree = upstream.find_tree(tree_id).unwrap();
+        let head = upstream.head().unwrap().peel_to_commit().unwrap();
+        upstream
+            .commit(Some("HEAD"), &sig, &sig, "second", &tree, &[&head])
+            .unwrap();
+    }
+
+    // Second fetch
+    let (_, hash2): (std::path::PathBuf, String) =
+        fc_evaluator::git::clone_or_fetch(&url, work_dir.path(), "test-project")
+            .expect("second fetch failed");
+
+    assert!(!hash1.is_empty());
+    assert!(!hash2.is_empty());
+}
+
+#[test]
+fn test_clone_invalid_url_returns_error() {
+    let work_dir = TempDir::new().unwrap();
+    let result =
+        fc_evaluator::git::clone_or_fetch("file:///nonexistent/repo", work_dir.path(), "bad-proj");
+    assert!(result.is_err());
+}