The interactive version of rebase does all the operations on a detached
HEAD, so that after a successful rebase, <branch>@{1} is the pre-rebase
state. The reflogs of "HEAD" still show all the actions in detail.
This teaches the non-interactive version to do the same.
Signed-off-by: Johannes Schindelin <johannes.schindelin@xxxxxx>
---
git-rebase.sh | 56 ++++++++++++++++++++++++++++++++++++++++++----
t/t3402-rebase-merge.sh | 7 +++++-
2 files changed, 57 insertions(+), 6 deletions(-)
diff --git a/git-rebase.sh b/git-rebase.sh
index 8814be9..3684a31 100755
--- a/git-rebase.sh
+++ b/git-rebase.sh
@@ -88,7 +88,7 @@ call_merge () {
cmt="$(cat "$dotest/cmt.$1")"
echo "$cmt" > "$dotest/current"
hd=$(git rev-parse --verify HEAD)
- cmt_name=$(git symbolic-ref HEAD)
+ cmt_name=$(git symbolic-ref HEAD 2> /dev/null || echo HEAD)
msgnum=$(cat "$dotest/msgnum")
end=$(cat "$dotest/end")
eval GITHEAD_$cmt='"${cmt_name##refs/heads/}~$(($end - $msgnum))"'
@@ -116,7 +116,24 @@ call_merge () {
esac
}
+move_to_original_branch () {
+ test -z "$head_name" &&
+ head_name="$(cat "$dotest"/head-name)" &&
+ onto="$(cat "$dotest"/onto)" &&
+ orig_head="$(cat "$dotest"/orig-head)"
+ case "$head_name" in
+ refs/*)
+ message="rebase finished: $head_name onto $onto"
+ git update-ref -m "$message" \
+ $head_name $(git rev-parse HEAD) $orig_head &&
+ git symbolic-ref HEAD $head_name ||
+ die "Could not move back to $head_name"
+ ;;
+ esac
+}
+
finish_rb_merge () {
+ move_to_original_branch
rm -r "$dotest"
echo "All done."
}
@@ -175,16 +192,23 @@ do
finish_rb_merge
exit
fi
- git am -3 --skip --resolvemsg="$RESOLVEMSG"
+ head_name=$(cat .dotest/head-name) &&
+ onto=$(cat .dotest/onto) &&
+ orig_head=$(cat .dotest/orig-head) &&
+ git am -3 --skip --resolvemsg="$RESOLVEMSG" &&
+ move_to_original_branch
exit
;;
--abort)
git rerere clear
if test -d "$dotest"
then
+ move_to_original_branch
rm -r "$dotest"
elif test -d .dotest
then
+ dotest=.dotest
+ move_to_original_branch
rm -r .dotest
else
die "No rebase in progress?"
@@ -320,6 +344,19 @@ then
GIT_PAGER='' git diff --stat --summary "$mb" "$onto"
fi
+# move to a detached HEAD
+orig_head=$(git rev-parse HEAD^0)
+head_name=$(git symbolic-ref HEAD 2> /dev/null)
+case "$head_name" in
+'')
+ head_name="detached HEAD"
+ ;;
+*)
+ git checkout "$orig_head" > /dev/null 2>&1 ||
+ die "could not detach HEAD"
+ ;;
+esac
+
# Rewind the head to "$onto"; this saves our current head in ORIG_HEAD.
echo "First, rewinding head to replay your work on top of it..."
git-reset --hard "$onto"
@@ -329,14 +366,21 @@ git-reset --hard "$onto"
if test "$mb" = "$branch"
then
echo >&2 "Fast-forwarded $branch_name to $onto_name."
+ move_to_original_branch
exit 0
fi
if test -z "$do_merge"
then
git format-patch -k --stdout --full-index --ignore-if-in-upstream "$upstream"..ORIG_HEAD |
- git am $git_am_opt --binary -3 -k --resolvemsg="$RESOLVEMSG"
- exit $?
+ git am $git_am_opt --binary -3 -k --resolvemsg="$RESOLVEMSG" &&
+ move_to_original_branch
+ ret=$?
+ test 0 != $ret -a -d .dotest &&
+ echo $head_name > .dotest/head-name &&
+ echo $onto > .dotest/onto &&
+ echo $orig_head > .dotest/orig-head
+ exit $ret
fi
# start doing a rebase with git-merge
@@ -345,8 +389,10 @@ fi
mkdir -p "$dotest"
echo "$onto" > "$dotest/onto"
echo "$onto_name" > "$dotest/onto_name"
-prev_head=`git rev-parse HEAD^0`
+prev_head=$orig_head
echo "$prev_head" > "$dotest/prev_head"
+echo "$orig_head" > "$dotest/orig-head"
+echo "$head_name" > "$dotest/head-name"
msgnum=0
for cmt in `git rev-list --reverse --no-merges "$upstream"..ORIG_HEAD`
diff --git a/t/t3402-rebase-merge.sh b/t/t3402-rebase-merge.sh
index 0779aaa..7b7d072 100755
--- a/t/t3402-rebase-merge.sh
+++ b/t/t3402-rebase-merge.sh
@@ -48,9 +48,14 @@ test_expect_success 'reference merge' '
git merge -s recursive "reference merge" HEAD master
'
+PRE_REBASE=$(git rev-parse test-rebase)
test_expect_success rebase '
git checkout test-rebase &&
- git rebase --merge master
+ GIT_TRACE=1 git rebase --merge master
+'
+
+test_expect_success 'test-rebase@{1} is pre rebase' '
+ test $PRE_REBASE = $(git rev-parse test-rebase@{1})
'
test_expect_success 'merge and rebase should match' '
--
1.5.3.5.1634.g0fa78
-
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