1 files changed, 27 insertions, 0 deletions
diff --git a/modules/git/repo_object.go b/modules/git/repo_object.go
index 3be8400d22..67060e30b0 100644
--- a/modules/git/repo_object.go
+++ b/modules/git/repo_object.go
@@ -4,6 +4,12 @@
 
 package git
 
+import (
+	"bytes"
+	"io"
+	"strings"
+)
+
 // ObjectType git object type
 type ObjectType string
 
@@ -17,3 +23,24 @@ const (
 	// ObjectTag tag object type
 	ObjectTag ObjectType = "tag"
 )
+
+// HashObject takes a reader and returns SHA1 hash for that reader
+func (repo *Repository) HashObject(reader io.Reader) (SHA1, error) {
+	idStr, err := repo.hashObject(reader)
+	if err != nil {
+		return SHA1{}, err
+	}
+	return NewIDFromString(idStr)
+}
+
+func (repo *Repository) hashObject(reader io.Reader) (string, error) {
+	cmd := NewCommand("hash-object", "-w", "--stdin")
+	stdout := new(bytes.Buffer)
+	stderr := new(bytes.Buffer)
+	err := cmd.RunInDirFullPipeline(repo.Path, stdout, stderr, reader)
+
+	if err != nil {
+		return "", err
+	}
+	return strings.TrimSpace(stdout.String()), nil
+}