[PATCH 2/3] When creating branch c/d check that branch c does not already exists.

With packed refs, there may not be a ".git/refs/heads/c" file
when branch c exists. And currently in this case, there is no check
to prevent creation of branch c/d.

This should probably be rewritten in C and done after the ref lock
has been taken to make sure no race exists though.

This is mainly to make all test cases in "t3210-pack-refs.sh" work.

Signed-off-by: Christian Couder <redacted>
---
 git-branch.sh |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/git-branch.sh b/git-branch.sh
index 4826c75..4a1e7d9 100755
--- a/git-branch.sh
+++ b/git-branch.sh

@@ -122,6 +122,16 @@ then
 	done
 fi
 
+branchdir=$(dirname $branchname)
+while test "$branchdir" != "."
+do
+	if git-show-ref --verify --quiet -- "refs/heads/$branchdir"
+	then
+		die "$branchdir already exists."
+	fi
+	branchdir=$(dirname $branchdir)
+done
+
 if git-show-ref --verify --quiet -- "refs/heads/$branchname"
 then
 	if test '' = "$force"

-- 
1.4.2.1.g3bab