rebase -i: provide reasonable reflog for the rebased branch

If your rebase succeeded, the HEAD's reflog will still show the whole
mess, but "<branchname>@{1}" now shows the state _before_ the rebase,
so that you can reset (or compare) the original and the rebased
revisions more easily.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/git-rebase--interactive.sh b/git-rebase--interactive.sh
index a81432c0a5b9e5caca47d58665b47c75accacc74..f0f2457975edcedaf9cf241efa189ae2fb081de7 100755 (executable)
--- a/git-rebase--interactive.sh
+++ b/git-rebase--interactive.sh
@@ -151,8 +151,14 @@ do_next () {
        esac
        test -s "$TODO" && return
 
-       HEAD=$(git rev-parse HEAD)
-       HEADNAME=$(cat "$DOTEST"/head-name)
+       comment_for_reflog finish &&
+       HEADNAME=$(cat "$DOTEST"/head-name) &&
+       OLDHEAD=$(cat "$DOTEST"/head) &&
+       SHORTONTO=$(git rev-parse --short $(cat "$DOTEST"/onto)) &&
+       NEWHEAD=$(git rev-parse HEAD) &&
+       message="$GIT_REFLOG_ACTION: $HEADNAME onto $SHORTONTO)" &&
+       git update-ref -m "$message" $HEADNAME $NEWHEAD $OLDHEAD &&
+       git symbolic-ref HEAD $HEADNAME &&
        rm -rf "$DOTEST" &&
        warn "Successfully rebased and updated $HEADNAME."
 

diff --git a/t/t3404-rebase-interactive.sh b/t/t3404-rebase-interactive.sh
index 19a3a8e813785fbb1a6cfc522bff212ec3a9e6fc..9f12bb932115629669625fad131c6aa580e572f1 100755 (executable)
--- a/t/t3404-rebase-interactive.sh
+++ b/t/t3404-rebase-interactive.sh
@@ -99,6 +99,10 @@ test_expect_success 'rebase on top of a non-conflicting commit' '
        test $(git rev-parse I) = $(git rev-parse HEAD~2)
 '
 
+test_expect_success 'reflog for the branch shows state before rebase' '
+       test $(git rev-parse branch1@{1}) = $(git rev-parse original-branch1)
+'
+
 test_expect_success 'exchange two commits' '
        FAKE_LINES="2 1" git rebase -i HEAD~2 &&
        test H = $(git cat-file commit HEAD^ | tail -n 1) &&