fix: seed empty app repositories

cmd/bootstrap.go

@@ -62,7 +62,11 @@ func runBootstrap(cmd *cobra.Command, args []string) error {
 		if err != nil {
 			return err
 		}
-		if created {
+		hasDeliveryBranch, err := manager.HasRemoteBranch(cfg.Delivery.AppRepoURL, cfg.Delivery.AppRepoRef)
+		if err != nil {
+			return err
+		}
+		if created || !hasDeliveryBranch {
 			if err := manager.PushRef(bootstrapPublishAppFrom, cfg.Delivery.AppRepoURL, "HEAD", cfg.Delivery.AppRepoRef); err != nil {
 				return err
 			}

internal/forgejo/repo.go

@@ -206,6 +206,23 @@ func (rm *RepoManager) PushRef(dir, repoURL, sourceRef, targetBranch string) err
 	return runGit(dir, environment, "push", repoURL, sourceRef+":refs/heads/"+targetBranch)
 }
 
+func (rm *RepoManager) HasRemoteBranch(repoURL, branch string) (bool, error) {
+	cleanupAskPass, environment, err := rm.gitEnvironment("")
+	if err != nil {
+		return false, err
+	}
+	defer cleanupAskPass()
+	command := exec.Command("git", "ls-remote", "--exit-code", repoURL, "refs/heads/"+branch)
+	command.Env = environment
+	if err := command.Run(); err != nil {
+		if exitError, ok := err.(*exec.ExitError); ok && exitError.ExitCode() == 2 {
+			return false, nil
+		}
+		return false, err
+	}
+	return true, nil
+}
+
 func CurrentBranch(dir string) (string, error) {
 	command := exec.Command("git", "branch", "--show-current")
 	command.Dir = dir

internal/forgejo/repo_test.go

@@ -116,6 +116,18 @@ func TestEnsureRepositoryCreatesWithoutInitialization(t *testing.T) {
 	}
 }
 
+func TestHasRemoteBranchReturnsFalseForMissingBranch(t *testing.T) {
+	server := httptest.NewServer(http.HandlerFunc(func(writer http.ResponseWriter, request *http.Request) {
+		writer.WriteHeader(http.StatusNotFound)
+	}))
+	defer server.Close()
+	manager := NewRepoManager(server.URL, "token", "owner", "user", "manifests", "cluster", "main", "maidn/bootstrap-test")
+	manager.HTTPClient = server.Client()
+	if _, err := manager.HasRemoteBranch(server.URL, "main"); err == nil {
+		t.Fatal("HasRemoteBranch() accepted a failed git remote lookup")
+	}
+}
+
 func TestRepoExistsReturnsFalseOnNotFound(t *testing.T) {
 	server := httptest.NewServer(http.HandlerFunc(func(writer http.ResponseWriter, request *http.Request) {
 		writer.WriteHeader(http.StatusNotFound)