1 files changed, 82 insertions, 0 deletions
diff --git a/modules/git/repo_branch_nogogit.go b/modules/git/repo_branch_nogogit.go
new file mode 100644
index 0000000000..5ec46d725e
--- /dev/null
+++ b/modules/git/repo_branch_nogogit.go
@@ -0,0 +1,82 @@
+// Copyright 2015 The Gogs Authors. All rights reserved.
+// Copyright 2018 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+// +build !gogit
+
+package git
+
+import (
+	"bufio"
+	"io"
+	"strings"
+)
+
+// IsBranchExist returns true if given branch exists in current repository.
+func (repo *Repository) IsBranchExist(name string) bool {
+	if name == "" {
+		return false
+	}
+	return IsReferenceExist(repo.Path, BranchPrefix+name)
+}
+
+// GetBranches returns all branches of the repository.
+func (repo *Repository) GetBranches() ([]string, error) {
+	return callShowRef(repo.Path, BranchPrefix, "--heads")
+}
+
+func callShowRef(repoPath, prefix, arg string) ([]string, error) {
+	var branchNames []string
+
+	stdoutReader, stdoutWriter := io.Pipe()
+	defer func() {
+		_ = stdoutReader.Close()
+		_ = stdoutWriter.Close()
+	}()
+
+	go func() {
+		stderrBuilder := &strings.Builder{}
+		err := NewCommand("show-ref", arg).RunInDirPipeline(repoPath, stdoutWriter, stderrBuilder)
+		if err != nil {
+			if stderrBuilder.Len() == 0 {
+				_ = stdoutWriter.Close()
+				return
+			}
+			_ = stdoutWriter.CloseWithError(ConcatenateError(err, stderrBuilder.String()))
+		} else {
+			_ = stdoutWriter.Close()
+		}
+	}()
+
+	bufReader := bufio.NewReader(stdoutReader)
+	for {
+		// The output of show-ref is simply a list:
+		// <sha> SP <ref> LF
+		_, err := bufReader.ReadSlice(' ')
+		for err == bufio.ErrBufferFull {
+			// This shouldn't happen but we'll tolerate it for the sake of peace
+			_, err = bufReader.ReadSlice(' ')
+		}
+		if err == io.EOF {
+			return branchNames, nil
+		}
+		if err != nil {
+			return nil, err
+		}
+
+		branchName, err := bufReader.ReadString('\n')
+		if err == io.EOF {
+			// This shouldn't happen... but we'll tolerate it for the sake of peace
+			return branchNames, nil
+		}
+		if err != nil {
+			return nil, err
+		}
+		branchName = strings.TrimPrefix(branchName, prefix)
+		if len(branchName) > 0 {
+			branchName = branchName[:len(branchName)-1]
+		}
+		branchNames = append(branchNames, branchName)
+	}
+}