admin: New option to pass branch to use

admin/main.go

@@ -66,6 +66,7 @@ func main() {
 	cloudPassword := ""
 	localImporterDirectory := ""
 	gitImporterRemote := ""
+	gitImporterBranch := ""
 	localImporterSymlink := false
 	baseURL := "/"
 	checkplugins := sync.CheckPluginList{}
@@ -113,6 +114,8 @@ func main() {
 		"Copy files or just create symlink?")
 	flag.StringVar(&gitImporterRemote, "git-import-remote", gitImporterRemote,
 		"Remote URL of the git repository to use as synchronization source")
+	flag.StringVar(&gitImporterBranch, "git-branch", gitImporterBranch,
+		"Branch to use in the git repository")
 	flag.StringVar(&cloudDAVBase, "clouddav", cloudDAVBase,
 		"Base directory where found challenges files to import, cloud part")
 	flag.StringVar(&cloudUsername, "clouduser", cloudUsername, "Username used to sync")
@@ -133,7 +136,7 @@ func main() {
 		log.Fatal("Cannot have both --clouddav and --git-import-remote defined.")
 		return
 	} else if gitImporterRemote != "" {
-		sync.GlobalImporter = sync.NewGitImporter(sync.LocalImporter{Base: localImporterDirectory, Symlink: localImporterSymlink}, gitImporterRemote)
+		sync.GlobalImporter = sync.NewGitImporter(sync.LocalImporter{Base: localImporterDirectory, Symlink: localImporterSymlink}, gitImporterRemote, gitImporterBranch)
 	} else if localImporterDirectory != "" {
 		sync.GlobalImporter = sync.LocalImporter{Base: localImporterDirectory, Symlink: localImporterSymlink}
 	} else if cloudDAVBase != "" {

admin/sync/importer_git.go

@@ -11,6 +11,7 @@ import (
 
 	"github.com/go-git/go-git/v5"
 	"github.com/go-git/go-git/v5/config"
+	"github.com/go-git/go-git/v5/plumbing"
 	"github.com/go-git/go-git/v5/plumbing/transport/ssh"
 )
 
@@ -19,10 +20,11 @@ import (
 type GitImporter struct {
 	li     LocalImporter
 	Remote string
+	Branch string
 	Auth   ssh.AuthMethod
 }
 
-func NewGitImporter(li LocalImporter, remote string) GitImporter {
+func NewGitImporter(li LocalImporter, remote string, branch string) GitImporter {
 	var auth ssh.AuthMethod
 
 	// If there is no ssh-agent setup, try to use a default ssh key
@@ -47,6 +49,7 @@ func NewGitImporter(li LocalImporter, remote string) GitImporter {
 	return GitImporter{
 		li:     li,
 		Remote: remote,
+		Branch: branch,
 		Auth:   auth,
 	}
 }
@@ -76,6 +79,7 @@ func (i GitImporter) Init() error {
 	} else if n == 0 {
 		_, err = git.PlainClone(i.li.Base, false, &git.CloneOptions{
 			URL:               i.Remote,
+			ReferenceName:     plumbing.ReferenceName(i.Branch),
 			RecurseSubmodules: git.DefaultSubmoduleRecursionDepth,
 			Auth:              i.Auth,
 		})
@@ -116,6 +120,7 @@ func (i GitImporter) Sync() error {
 	// Perform a git pull --rebase origin/master
 	err = w.Pull(&git.PullOptions{
 		RemoteName:        "origin",
+		ReferenceName:     plumbing.ReferenceName(i.Branch),
 		Depth:             1,
 		RecurseSubmodules: git.DefaultSubmoduleRecursionDepth,
 		Force:             true,

admin/sync/importer_gitbin.go

@@ -22,12 +22,18 @@ import (
 type GitImporter struct {
 	li     LocalImporter
 	Remote string
+	Branch string
 }
 
-func NewGitImporter(li LocalImporter, remote string) GitImporter {
+func NewGitImporter(li LocalImporter, remote string, branch string) GitImporter {
+	if len(branch) == 0 {
+		branch = "master"
+	}
+
 	return GitImporter{
 		li:     li,
 		Remote: remote,
+		Branch: branch,
 	}
 }
 
@@ -62,8 +68,14 @@ func (i GitImporter) Init() error {
 	if n, err := countFileInDir(i.li.Base); err != nil {
 		return err
 	} else if n == 0 {
+		args := []string{"clone", "--recursive", "--depth", "1"}
+		if i.Branch != "" {
+			args = append(args, "-b", i.Branch)
+		}
+		args = append(args, "--shallow-submodules", i.Remote, i.li.Base)
+
 		log.Println("Please wait while creating the local git repository...")
-		cmdclone := exec.Command("git", "clone", "--recursive", "--depth", "1", "--shallow-submodules", i.Remote, i.li.Base)
+		cmdclone := exec.Command("git", args...)
 		stdout, err := cmdclone.CombinedOutput()
 		if err != nil {
 			return fmt.Errorf("%w:\n%s", err, stdout)
@@ -109,7 +121,7 @@ func (i GitImporter) Sync() error {
 		}
 	}
 
-	cmdreset := exec.Command("git", "-C", i.li.Base, "reset", "--hard", "--recurse-submodule", "origin/master")
+	cmdreset := exec.Command("git", "-C", i.li.Base, "reset", "--hard", "--recurse-submodule", "origin/"+i.Branch)
 	stdout, err = cmdreset.CombinedOutput()
 	if err != nil {
 		log.Printf("Local git repository reset failed: %s\n%s", err, stdout)