git-branch: add options and tests for branch renaming

Extend git-branch with the following options:

  git-branch -m|-M [<oldbranch>] newbranch

The -M variation is required to force renaming over an exsisting
branchname.

This also indroduces $GIT_DIR/RENAME_REF which is a "metabranch"
used when renaming branches. It will always hold the original sha1
for the latest renamed branch.

Additionally, if $GIT_DIR/logs/RENAME_REF exists, all branch rename
events are logged there.

Finally, some testcases are added to verify the new options.

Signed-off-by: Lars Hjemli <hjemli@gmail.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>

1 files changed, 34 insertions, 0 deletions

diff --git a/t/t3200-branch.sh b/t/t3200-branch.sh
index acb54b6..afaa853 100755
--- a/t/t3200-branch.sh
+++ b/t/t3200-branch.sh
@@ -70,4 +70,38 @@ test_expect_success \
         git-branch -d l/m &&
         git-branch l'
 
+test_expect_success \
+    'git branch -m m m/m should work' \
+       'git-branch -l m &&
+        git-branch -m m m/m &&
+        test -f .git/logs/refs/heads/m/m'
+
+test_expect_success \
+    'git branch -m n/n n should work' \
+       'git-branch -l n/n &&
+        git-branch -m n/n n
+        test -f .git/logs/refs/heads/n'
+
+test_expect_failure \
+    'git branch -m o/o o should fail when o/p exists' \
+       'git-branch o/o &&
+        git-branch o/p &&
+        git-branch -m o/o o'
+
+test_expect_failure \
+    'git branch -m q r/q should fail when r exists' \
+       'git-branch q &&
+         git-branch r &&
+         git-branch -m q r/q'
+
+test_expect_success \
+    'git branch -m s/s s should work when s/t is deleted' \
+       'git-branch -l s/s &&
+        test -f .git/logs/refs/heads/s/s &&
+        git-branch -l s/t &&
+        test -f .git/logs/refs/heads/s/t &&
+        git-branch -d s/t &&
+        git-branch -m s/s s &&
+        test -f .git/logs/refs/heads/s'
+
 test_done