From: George Dunlap <george.dunlap@citrix.com>
Date: Wed, 17 May 2017 16:39:55 +0000 (+0100)
Subject: git: Implement ParseRef to change a ref into a changeset
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=a188e885c9bc5a766f5e054568856762b0aec403;p=people%2Fgdunlap%2Fxsatool

git: Implement ParseRef to change a ref into a changeset

Signed-off-by: George Dunlap <george.dunlap@citrix.com>
---

diff --git a/git.go b/git.go
index b015c75..e7b5bc7 100644
--- a/git.go
+++ b/git.go
@@ -110,6 +110,18 @@ func (r Repo) VerifyRef(ref string) (ok bool) {
 	return err == nil
 }
 
+func (r Repo) ParseRef(ref string) (string, error) {
+	out, err := r.gitCmd("rev-parse", "--verify", ref)
+	if err != nil {
+		return "", err
+	}
+	lines := strings.Split(string(out), "\n")
+	if len(lines) != 2 {
+		return "", fmt.Errorf("Multiple lines in output")
+	}
+	return lines[0], nil
+}
+
 func (r Repo) DeleteBranch(branch string) (out []byte, err error) {
 	out, err = r.gitCmd("branch", "-D", branch)