feat: allow retrieval of commits for tags (#675)

testhelper/gittest/gittest.go

@@ -109,8 +109,17 @@ func (s *Server) GetServerCA() []byte {
 	return getServerCA(s.Server)
 }
 
-func (s *Server) GetLatestCommitHash(t testing.TB, branch string) string {
-	cmd := exec.Command("git", "-c", "http.sslVerify=false", "ls-remote", s.URL, fmt.Sprintf("refs/heads/%s", branch))
+func (s *Server) GetLatestCommitHash(t testing.TB, referenceType, ref string) string {
+	var refType string
+	switch referenceType {
+	case "branch":
+		refType = "heads"
+	case "tag":
+		refType = "tags"
+	default:
+		require.Fail(t, "invalid refType")
+	}
+	cmd := exec.Command("git", "-c", "http.sslVerify=false", "ls-remote", s.URL, fmt.Sprintf("refs/%s/%s", refType, ref))
 	out, err := cmd.Output()
 	require.NoError(t, err, "should be able to run the ls-remote command")
 	commitHash := strings.Split(string(out), "\t")[0]

testhelper/gittest/gittest_test.go

@@ -63,7 +63,7 @@ func TestGitServer(t *testing.T) {
 		require.NoError(t, err, "should be able to get the HEAD commit")
 		require.NotEmpty(t, out, "HEAD commit should not be empty")
 
-		latestCommit := s.GetLatestCommitHash(t, "develop")
+		latestCommit := s.GetLatestCommitHash(t, "branch", "develop")
 		require.Equal(t, strings.TrimSpace(out), latestCommit, "HEAD commit should match the latest commit")
 	})
 
@@ -79,7 +79,15 @@ func TestGitServer(t *testing.T) {
 		require.NoError(t, err, "should be able to get the HEAD commit")
 		require.NotEmpty(t, out, "HEAD commit should not be empty")
 
-		latestCommit := s.GetLatestCommitHash(t, "main")
+		out, err = execCmd("git", "-C", tempDir, "tag", "-a", "v1.0.0", "-m", "tag v1.0.0")
+		require.NoErrorf(t, err, "should be able to create a new tag: %s", out)
+		out, err = execCmd("git", "-c", "http.sslVerify=false", "-C", tempDir, "push", "origin", "v1.0.0")
+		require.NoErrorf(t, err, "should be able to push the new tag: %s", out)
+
+		out, err = execCmd("git", "-C", tempDir, "rev-parse", "v1.0.0")
+		require.NoError(t, err, "should be able to get the HEAD commit")
+		latestCommit := s.GetLatestCommitHash(t, "tag", "v1.0.0")
+
 		require.Equal(t, strings.TrimSpace(out), latestCommit, "HEAD commit should match the latest commit")
 	})
 }