1 files changed, 67 insertions, 0 deletions
diff --git a/modules/git/repo_tree.go b/modules/git/repo_tree.go
new file mode 100644
index 00000000..ab48d47d
--- /dev/null
+++ b/modules/git/repo_tree.go
@@ -0,0 +1,67 @@
+// Copyright 2015 The Gogs Authors. All rights reserved.
+// Copyright 2019 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package git
+
+import (
+	"bytes"
+	"os"
+	"strings"
+	"time"
+)
+
+// CommitTreeOpts represents the possible options to CommitTree
+type CommitTreeOpts struct {
+	Parents    []string
+	Message    string
+	KeyID      string
+	NoGPGSign  bool
+	AlwaysSign bool
+}
+
+// CommitTree creates a commit from a given tree id for the user with provided message
+func (repo *Repository) CommitTree(author, committer *Signature, tree *Tree, opts CommitTreeOpts) (ObjectID, error) {
+	commitTimeStr := time.Now().Format(time.RFC3339)
+
+	// Because this may call hooks we should pass in the environment
+	env := append(os.Environ(),
+		"GIT_AUTHOR_NAME="+author.Name,
+		"GIT_AUTHOR_EMAIL="+author.Email,
+		"GIT_AUTHOR_DATE="+commitTimeStr,
+		"GIT_COMMITTER_NAME="+committer.Name,
+		"GIT_COMMITTER_EMAIL="+committer.Email,
+		"GIT_COMMITTER_DATE="+commitTimeStr,
+	)
+	cmd := NewCommand(repo.Ctx, "commit-tree").AddDynamicArguments(tree.ID.String())
+
+	for _, parent := range opts.Parents {
+		cmd.AddArguments("-p").AddDynamicArguments(parent)
+	}
+
+	messageBytes := new(bytes.Buffer)
+	_, _ = messageBytes.WriteString(opts.Message)
+	_, _ = messageBytes.WriteString("\n")
+
+	if opts.KeyID != "" || opts.AlwaysSign {
+		cmd.AddOptionFormat("-S%s", opts.KeyID)
+	}
+
+	if opts.NoGPGSign {
+		cmd.AddArguments("--no-gpg-sign")
+	}
+
+	stdout := new(bytes.Buffer)
+	stderr := new(bytes.Buffer)
+	err := cmd.Run(&RunOpts{
+		Env:    env,
+		Dir:    repo.Path,
+		Stdin:  messageBytes,
+		Stdout: stdout,
+		Stderr: stderr,
+	})
+	if err != nil {
+		return nil, ConcatenateError(err, stderr.String())
+	}
+	return NewIDFromString(strings.TrimSpace(stdout.String()))
+}