added helper function to get PR info

pkg/mirror/example_noworktree_test.go

@@ -48,7 +48,7 @@ repositories:
 
 	// perform 1st mirror to ensure all repositories
 	// initial mirror might take longer
-	if err := repos.Mirror(ctx, 5*time.Minute); err != nil {
+	if err := repos.MirrorAll(ctx, 5*time.Minute); err != nil {
 		panic(err)
 	}
 

pkg/mirror/example_worktree_test.go

@@ -51,7 +51,7 @@ repositories:
 
 	// perform 1st mirror to ensure all repositories
 	// initial mirror might take longer
-	if err := repos.Mirror(ctx, 5*time.Minute); err != nil {
+	if err := repos.MirrorAll(ctx, 5*time.Minute); err != nil {
 		panic(err)
 	}
 

pkg/mirror/repo_pool.go

@@ -68,11 +68,11 @@ func (rp *RepoPool) AddRepository(repo *Repository) error {
 	return nil
 }
 
-// Mirror will trigger mirror on every repo in foreground with given timeout.
+// MirrorAll will trigger mirror on every repo in foreground with given timeout.
 // It will error out if any of the repository mirror errors.
-// Ideally Mirror should be used for the first mirror cycle to ensure repositories are
+// Ideally MirrorAll should be used for the first mirror cycle to ensure repositories are
 // successfully mirrored
-func (rp *RepoPool) Mirror(ctx context.Context, timeout time.Duration) error {
+func (rp *RepoPool) MirrorAll(ctx context.Context, timeout time.Duration) error {
 	for _, repo := range rp.repos {
 		mCtx, cancel := context.WithTimeout(ctx, timeout)
 		err := repo.Mirror(mCtx)
@@ -85,6 +85,16 @@ func (rp *RepoPool) Mirror(ctx context.Context, timeout time.Duration) error {
 	return nil
 }
 
+// Mirror is wrapper around repositories Mirror method
+func (rp *RepoPool) Mirror(ctx context.Context, remote string) error {
+	repo, err := rp.Repository(remote)
+	if err != nil {
+		return err
+	}
+
+	return repo.Mirror(ctx)
+}
+
 // StartLoop will start mirror loop on all repositories
 // if its not already started
 func (rp *RepoPool) StartLoop() {
@@ -175,6 +185,27 @@ func (rp *RepoPool) ChangedFiles(ctx context.Context, remote, hash string) ([]st
 	return repo.ChangedFiles(ctx, hash)
 }
 
+// ChangedFilesBetweenRefs is wrapper around repositories ChangedFilesBetweenRefs method
+// git diff --name-only HEAD...refs/pull/13179/head
+// git diff --name-only --merge-base HEAD refs/pull/13179/head
+func (rp *RepoPool) ChangedFilesBetweenRefs(ctx context.Context, remote, ref1, ref2 string) ([]string, error) {
+	repo, err := rp.Repository(remote)
+	if err != nil {
+		return nil, err
+	}
+	return repo.ChangedFilesBetweenRefs(ctx, ref1, ref2)
+}
+
+// CommitsBetweenRefs is wrapper around repositories CommitsBetweenRefs method
+// git rev-list ^HEAD refs/pull/13179/head
+func (rp *RepoPool) CommitsBetweenRefs(ctx context.Context, remote, ref1, ref2 string) ([]string, error) {
+	repo, err := rp.Repository(remote)
+	if err != nil {
+		return nil, err
+	}
+	return repo.CommitsBetweenRefs(ctx, ref1, ref2)
+}
+
 // ObjectExists is wrapper around repositories ObjectExists method
 func (rp *RepoPool) ObjectExists(ctx context.Context, remote, obj string) error {
 	repo, err := rp.Repository(remote)

pkg/mirror/repository.go

@@ -220,6 +220,52 @@ func (r *Repository) ChangedFiles(ctx context.Context, hash string) ([]string, e
 	return strings.Split(msg, "\n"), nil
 }
 
+// ChangedFilesBetweenRefs returns path of the changed files between ref1 and ref2,
+// using the merge base of the two commits for the "before" side.
+// git diff --name-only HEAD...refs/pull/13179/head
+// git diff --name-only --merge-base HEAD refs/pull/13179/head
+func (r *Repository) ChangedFilesBetweenRefs(ctx context.Context, ref1, ref2 string) ([]string, error) {
+	r.lock.RLock()
+	defer r.lock.RUnlock()
+
+	if err := r.ObjectExists(ctx, ref1); err != nil {
+		return nil, err
+	}
+	if err := r.ObjectExists(ctx, ref2); err != nil {
+		return nil, err
+	}
+
+	// merge-base finds the best common ancestor(s) between two commits to use in a three-way merge.
+	args := []string{"diff", `--name-only`, `--merge-base`, ref1, ref2}
+	msg, err := runGitCommand(ctx, r.log, r.envs, r.dir, args...)
+	if err != nil {
+		return nil, err
+	}
+	return strings.Split(msg, "\n"), nil
+}
+
+// ChangedFiles returns list of all the commits which are reachable from ref2, but not from ref1".
+// list is in reverse order ie old commit -> new commit
+// git rev-list ^HEAD refs/pull/13179/head
+func (r *Repository) CommitsBetweenRefs(ctx context.Context, ref1, ref2 string) ([]string, error) {
+	r.lock.RLock()
+	defer r.lock.RUnlock()
+
+	if err := r.ObjectExists(ctx, ref1); err != nil {
+		return nil, err
+	}
+	if err := r.ObjectExists(ctx, ref2); err != nil {
+		return nil, err
+	}
+
+	args := []string{"rev-list", `--reverse`, "^" + ref1, ref2}
+	msg, err := runGitCommand(ctx, r.log, r.envs, r.dir, args...)
+	if err != nil {
+		return nil, err
+	}
+	return strings.Split(msg, "\n"), nil
+}
+
 // ObjectExists returns error is given object is not valid or if it doesn't exists
 func (r *Repository) ObjectExists(ctx context.Context, obj string) error {
 	r.lock.RLock()

pkg/mirror/z_e2e_test.go

@@ -1165,7 +1165,7 @@ func Test_RepoPool_Success(t *testing.T) {
 	}
 
 	// run initial mirror
-	if err := rp.Mirror(context.TODO(), testTimeout); err != nil {
+	if err := rp.MirrorAll(context.TODO(), testTimeout); err != nil {
 		t.Fatalf("unexpected err:%s", err)
 	}