Make rebase script saner.

It did not check to see if the working tree was clean and matched
the commit we were starting out as, resulting in the initial rebased
commit including whatever dirty state the working tree has had.

Signed-off-by: Junio C Hamano <junkio@cox.net>

1 files changed, 10 insertions, 7 deletions

diff --git a/git-rebase-script b/git-rebase-script
index 026225ab2c..7b1d4900bd 100755
--- a/git-rebase-script
+++ b/git-rebase-script
@@ -17,16 +17,19 @@ case "$#,$1" in
     shift ;;
 esac
 
+git-update-cache --refresh || exit
+
 case "$#" in
-1) upstream=`git-rev-parse --verify "$1"` &&
-   ours=`git-rev-parse --verify HEAD` || exit
-   ;;
-2) upstream=`git-rev-parse --verify "$1"` &&
-   ours=`git-rev-parse --verify "$2"` || exit
-   ;;
-*) echo >&2 "$usage"; exit 1 ;;
+1) ours_symbolic=HEAD ;;
+2) ours_symbolic="$2" ;;
+*) die "$usage" ;;
 esac
 
+upstream=`git-rev-parse --verify "$1"` &&
+ours=`git-rev-parse --verify "$ours_symbolic^` || exit
+test "$(git-diff-cache --cached "$ours")" = "" || 
+die "Your working tree does not match $ours_symbolic."
+
 git-read-tree -m -u $ours $upstream &&
 git-rev-parse --verify "$upstream^0" >"$GIT_DIR/HEAD" || exit