1 files changed, 15 insertions, 0 deletions
diff --git a/branches.go b/branches.go
index ec86c20..1c923dd 100644
--- a/branches.go
+++ b/branches.go
@@ -123,3 +123,18 @@ func (repo *Repo) GetHashName(h string) (string, error) {
 	}
 	return r.Stdout[0], nil
 }
+
+// lookup a hash from a tag with 'git rev-list'
+func (repo *Repo) GetTagHash(t string) string {
+	// git rev-list -n 1 v0.0.66
+	cmd := []string{"git", "rev-list", "-n", "1", t}
+	result, _ := repo.RunStrictNew(cmd)
+	// log.Info("getLastTagVersion()", result.Stdout)
+
+	if len(result.Stdout) == 0 {
+		// log.Log(WARN, "no gitpb.LastTag() repo is broken. ignore this.", repo.GetGoPath())
+		return ""
+	}
+
+	return result.Stdout[0]
+}