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>

diff --git a/git-rebase-script b/git-rebase-script
index 026225a..7b1d490 100755 (executable)
--- 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