From 2539b1ee096266b7fcca64545f93d7c08ab30f53 Mon Sep 17 00:00:00 2001
From: Kevin Sawicki <kevin@github.com>
Date: Tue, 6 Dec 2011 18:02:30 -0800
Subject: [PATCH] Set expected old object id to all zeros when head id is null

This will be the case on the initial commit to a repository
and the ref update should expect a non-existent ref

Change-Id: Iaa06e47e6e8cc4a0281c7683b367d4806dd980ea
---
 org.eclipse.jgit/src/org/eclipse/jgit/api/CommitCommand.java | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/api/CommitCommand.java b/org.eclipse.jgit/src/org/eclipse/jgit/api/CommitCommand.java
index fc56f9af1..14a7494ba 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/api/CommitCommand.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/api/CommitCommand.java
@@ -228,7 +228,10 @@ public RevCommit call() throws NoHeadException, NoMessageException,
 							ru.setRefLogMessage(
 									prefix + revCommit.getShortMessage(), false);
 						}
-						ru.setExpectedOldObjectId(headId);
+						if (headId != null)
+							ru.setExpectedOldObjectId(headId);
+						else
+							ru.setExpectedOldObjectId(ObjectId.zeroId());
 						Result rc = ru.forceUpdate();
 						switch (rc) {
 						case NEW: