2 files changed, 35 insertions, 0 deletions
diff --git a/modules/git/error.go b/modules/git/error.go
new file mode 100644
index 0000000000..c86c56e546
--- /dev/null
+++ b/modules/git/error.go
@@ -0,0 +1,22 @@
+// Copyright 2015 The Gogs Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package git
+
+import (
+	"fmt"
+)
+
+type ErrUnsupportedVersion struct {
+	Required string
+}
+
+func IsErrUnsupportedVersion(err error) bool {
+	_, ok := err.(ErrUnsupportedVersion)
+	return ok
+}
+
+func (err ErrUnsupportedVersion) Error() string {
+	return fmt.Sprintf("Operation requires higher version [required: %s]", err.Required)
+}
diff --git a/modules/git/repo_branch.go b/modules/git/repo_branch.go
index a4e060533c..86c4f538b4 100644
--- a/modules/git/repo_branch.go
+++ b/modules/git/repo_branch.go
@@ -35,3 +35,16 @@ func (repo *Repository) GetBranches() ([]string, error) {
 	}
 	return branches, nil
 }
+
+// SetDefaultBranch sets default branch of repository.
+func (repo *Repository) SetDefaultBranch(branchName string) error {
+	if gitVer.LessThan(MustParseVersion("1.7.10")) {
+		return ErrUnsupportedVersion{"1.7.10"}
+	}
+
+	_, stderr, err := com.ExecCmdDir(repo.Path, "git", "symbolic-ref", "HEAD", "refs/heads/"+branchName)
+	if err != nil {
+		return concatenateError(err, stderr)
+	}
+	return nil
+}