Handle case when branch not exist

Handle default branch name in push and branch create handlers
Don't panic in this case in case the project has multiple configs

bots-common/git_utils.go

@@ -24,7 +24,6 @@ import (
 	"log"
 	"os"
 	"os/exec"
-	"path"
 	"path/filepath"
 	"strings"
 	"sync"
@@ -93,94 +92,13 @@ func (refs *GitReferences) addReference(id, branch string) {
 	refs.refs = append(refs.refs, GitReference{Branch: branch, Id: id})
 }
 
-func processRefs(gitDir string) ([]GitReference, error) {
-	packedRefsPath := path.Join(gitDir, "packed-refs")
-	stat, err := os.Stat(packedRefsPath)
-	if err != nil {
-		return nil, err
-	}
-
-	if stat.Size() > 10000 || stat.IsDir() {
-		return nil, fmt.Errorf("Funny business with 'packed-refs' in '%s'", gitDir)
-	}
-
-	data, err := os.ReadFile(packedRefsPath)
-	if err != nil {
-		return nil, err
-	}
-
-	var references GitReferences
-	for _, line := range strings.Split(string(data), "\n") {
-		if len(line) < 1 || line[0] == '#' {
-			continue
-		}
-
-		splitLine := strings.Split(line, " ")
-		if len(splitLine) != 2 {
-			return nil, fmt.Errorf("Unexpected packaged-refs entry '%#v' in '%s'", splitLine, packedRefsPath)
-		}
-		id, ref := splitLine[0], splitLine[1]
-		const remoteRefPrefix = "refs/remotes/origin/"
-		if ref[0:len(remoteRefPrefix)] != remoteRefPrefix {
-			continue
-		}
-
-		references.addReference(id, ref[len(remoteRefPrefix):])
-	}
-
-	return references.refs, nil
-}
-
-func findGitDir(p string) (string, error) {
-	gitFile := path.Join(p, ".git")
-	stat, err := os.Stat(gitFile)
-	if err != nil {
-		return "", err
-	}
-
-	if stat.IsDir() {
-		return path.Join(p, ".git"), nil
-	}
-
-	data, err := os.ReadFile(gitFile)
-	if err != nil {
-		return "", err
-	}
-
-	for _, line := range strings.Split(string(data), "\n") {
-		refs := strings.Split(line, ":")
-		if len(refs) != 2 {
-			return "", fmt.Errorf("Unknown format of .git file: '%s'\n", line)
-		}
-
-		if refs[0] != "gitdir" {
-			return "", fmt.Errorf("Unknown header of .git file: '%s'\n", refs[0])
-		}
-
-		return path.Join(p, strings.TrimSpace(refs[1])), nil
-	}
-
-	return "", fmt.Errorf("Can't find git subdirectory in '%s'", p)
-}
-
 func (e *GitHandler) GitBranchHead(gitDir, branchName string) (string, error) {
-	path, err := findGitDir(path.Join(e.GitPath, gitDir))
+	id, err := e.GitExecWithOutput(gitDir, "rev-list", "-1", branchName)
 	if err != nil {
-		return "", fmt.Errorf("Error identifying gitdir in `%s`: %w", gitDir, err)
+		return "", fmt.Errorf("Can't find default remote branch: %s", branchName)
 	}
 
-	refs, err := processRefs(path)
-	if err != nil {
-		return "", fmt.Errorf("Error finding branches (%s): %w\n", branchName, err)
-	}
-
-	for _, ref := range refs {
-		if ref.Branch == branchName {
-			return ref.Id, nil
-		}
-	}
-
-	return "", fmt.Errorf("Can't find default remote branch: %s", branchName)
+	return strings.TrimSpace(id), nil 
 }
 
 func (e *GitHandler) Close() error {
@@ -208,6 +126,11 @@ func (h writeFunc) Close() error {
 }
 
 func (e *GitHandler) GitExec(cwd string, params ...string) error {
+	_, err := e.GitExecWithOutput(cwd, params...)
+	return err
+}
+
+func (e *GitHandler) GitExecWithOutput(cwd string, params ...string) (string, error) {
 	cmd := exec.Command("/usr/bin/git", params...)
 	cmd.Env = []string{
 		"GIT_CEILING_DIRECTORIES=" + e.GitPath,
@@ -232,10 +155,10 @@ func (e *GitHandler) GitExec(cwd string, params ...string) error {
 		if e.DebugLogger {
 			log.Printf(" *** error: %v\n", err)
 		}
-		return fmt.Errorf("error executing: git %#v \n%s\n err: %w", cmd.Args, out, err)
+		return "", fmt.Errorf("error executing: git %#v \n%s\n err: %w", cmd.Args, out, err)
 	}
 
-	return nil
+	return string(out), nil
 }
 
 type ChanIO struct {

bots-common/gitea_utils.go

@@ -485,3 +485,4 @@ func (gitea *GiteaTransport) GetRecentCommits(org, repo, branch string, commitNo
 
 	return commits.Payload, nil
 }
+