[PATCH] sequencer: fix --allow-empty-message behavior, make it smarter
- From
Elijah Newren <newren@gmail.com>
- Date
- Sep 12, 2018, 21:18 UTC
- Message-ID
- <20180912211848.26949-1-newren@gmail.com>
- In-Reply-To
- <20180912024241.GA27036@localhost>
In commit b00bf1c9a8dd ("git-rebase: make --allow-empty-message the default", 2018-06-27), several arguments were given for transplanting empty commits without halting and asking the user for confirmation on each commit. These arguments were incomplete because the logic clearly assumed the only cases under consideration were transplanting of commits with empty messages (see the comment about "There are two sources for commits with empty messages). It didn't discuss or even consider rewords, squashes, etc. where the user is explicitly asked for a new commit message and provides an empty one. (My bad, I totally should have thought about that at the time, but just didn't.)
Rewords and squashes are significantly different, though, as described by SZEDER:
Let's suppose you start an interactive rebase, choose a commit to
squash, save the instruction sheet, rebase fires up your editor, and
then you notice that you mistakenly chose the wrong commit to
squash. What do you do, how do you abort? Before [that commit] you could clear the commit message, exit the
editor, and then rebase would say "Aborting commit due to empty
commit message.", and you get to run 'git rebase --abort', and start
over. But [since that commit, ...] saving the commit message as is would
let rebase continue and create a bunch of unnecessary objects, and
then you would have to use the reflog to return to the pre-rebase
state.Also, he states:
The instructions in the commit message template, which is shown for
'reword' and 'squash', too, still say... # Please enter the commit message for your changes. Lines starting
# with '#' will be ignored, and an empty message aborts the commit.These are sound arguments that when editing commit messages during a sequencer operation, that if the commit message is empty then the operation should halt and ask the user to correct. The arguments in commit b00bf1c9a8dd (referenced above) still apply when transplanting previously created commits with empty commit messages, so the sequencer should not halt for those.
Furthermore, all rationale so far applies equally for cherry-pick as for rebase. Therefore, make the code default to --allow-empty-message when transplanting an existing commit, and to default to halting when the user is asked to edit a commit message and provides an empty one -- for both rebase and cherry-pick.
Signed-off-by: Elijah Newren <newren@gmail.com> --- This patch cleanly applies to both 2.19.0 and pu. There are some related code cleanups that I'd like to make, but doing that cleanup conflicts with the various rewrite-rebase-in-C topics sitting in pu; since those are fairly lengthy, I really don't want to cause problems there, but I think SZEDER really wants this 2.19.0 regression fix before 2.20.0 and thus before those other topics.
sequencer.c | 4 ++-- t/t3404-rebase-interactive.sh | 7 +++---- t/t3405-rebase-malformed.sh | 2 +- t/t3505-cherry-pick-empty.sh | 18 ++++++++---------- 4 files changed, 14 insertions(+), 17 deletions(-)
diff --git a/sequencer.c b/sequencer.c index dc2c58d464..638ee151f2 100644 --- a/sequencer.c +++ b/sequencer.c @@ -899,7 +899,7 @@ static int run_git_commit(const char *defmsg, struct replay_opts *opts, if ((flags & ALLOW_EMPTY)) argv_array_push(&cmd.args, "--allow-empty"); - if (opts->allow_empty_message) + if (!(flags & EDIT_MSG)) argv_array_push(&cmd.args, "--allow-empty-message"); if (cmd.err == -1) { @@ -1313,7 +1313,7 @@ static int try_to_commit(struct strbuf *msg, const char *author, if (cleanup != COMMIT_MSG_CLEANUP_NONE) strbuf_stripspace(msg, cleanup == COMMIT_MSG_CLEANUP_ALL); - if (!opts->allow_empty_message && message_is_empty(msg, cleanup)) { + if ((flags & EDIT_MSG) && message_is_empty(msg, cleanup)) { res = 1; /* run 'git commit' to display error message */ goto out; } diff --git a/t/t3404-rebase-interactive.sh b/t/t3404-rebase-interactive.sh index 86bba5ed7c..ff89b6341a 100755 --- a/t/t3404-rebase-interactive.sh +++ b/t/t3404-rebase-interactive.sh @@ -569,16 +569,15 @@ test_expect_success '--continue tries to commit, even for "edit"' ' ' test_expect_success 'aborted --continue does not squash commits after "edit"' ' - test_when_finished "git rebase --abort" && old=$(git rev-parse HEAD) && test_tick && set_fake_editor && FAKE_LINES="edit 1" git rebase -i HEAD^ && echo "edited again" > file7 && git add file7 && - echo all the things >>conflict && - test_must_fail git rebase --continue && - test $old = $(git rev-parse HEAD) + test_must_fail env FAKE_COMMIT_MESSAGE=" " git rebase --continue && + test $old = $(git rev-parse HEAD) && + git rebase --abort ' test_expect_success 'auto-amend only edited commits after "edit"' ' diff --git a/t/t3405-rebase-malformed.sh b/t/t3405-rebase-malformed.sh index da94dddc86..860e63e444 100755 --- a/t/t3405-rebase-malformed.sh +++ b/t/t3405-rebase-malformed.sh @@ -83,7 +83,7 @@ test_expect_success 'rebase -m commit with empty message' ' test_expect_success 'rebase -i commit with empty message' ' git checkout diff-in-message && set_fake_editor && - env FAKE_COMMIT_MESSAGE=" " FAKE_LINES="reword 1" \ + test_must_fail env FAKE_COMMIT_MESSAGE=" " FAKE_LINES="reword 1" \ git rebase -i HEAD^ ' diff --git a/t/t3505-cherry-pick-empty.sh b/t/t3505-cherry-pick-empty.sh index fbdc47cfbd..5f911bb529 100755 --- a/t/t3505-cherry-pick-empty.sh +++ b/t/t3505-cherry-pick-empty.sh @@ -11,17 +11,14 @@ test_expect_success setup ' test_tick && git commit -m "first" && - git checkout -b empty-branch && - test_tick && - git commit --allow-empty -m "empty" && - + git checkout -b empty-message-branch && echo third >> file1 && git add file1 && test_tick && git commit --allow-empty-message -m "" && git checkout master && - git checkout -b empty-branch2 && + git checkout -b empty-change-branch && test_tick && git commit --allow-empty -m "empty" @@ -29,7 +26,7 @@ test_expect_success setup ' test_expect_success 'cherry-pick an empty commit' ' git checkout master && - test_expect_code 1 git cherry-pick empty-branch^ + test_expect_code 1 git cherry-pick empty-change-branch ' test_expect_success 'index lockfile was removed' ' @@ -37,8 +34,9 @@ test_expect_success 'index lockfile was removed' ' ' test_expect_success 'cherry-pick a commit with an empty message' ' + test_when_finished "git reset --hard empty-message-branch~1" && git checkout master && - test_expect_code 1 git cherry-pick empty-branch + git cherry-pick empty-message-branch ' test_expect_success 'index lockfile was removed' ' @@ -47,7 +45,7 @@ test_expect_success 'index lockfile was removed' ' test_expect_success 'cherry-pick a commit with an empty message with --allow-empty-message' ' git checkout -f master && - git cherry-pick --allow-empty-message empty-branch + git cherry-pick --allow-empty-message empty-message-branch ' test_expect_success 'cherry pick an empty non-ff commit without --allow-empty' ' @@ -55,12 +53,12 @@ test_expect_success 'cherry pick an empty non-ff commit without --allow-empty' ' echo fourth >>file2 && git add file2 && git commit -m "fourth" && - test_must_fail git cherry-pick empty-branch2 + test_must_fail git cherry-pick empty-change-branch ' test_expect_success 'cherry pick an empty non-ff commit with --allow-empty' ' git checkout master && - git cherry-pick --allow-empty empty-branch2 + git cherry-pick --allow-empty empty-change-branch ' test_expect_success 'cherry pick with --keep-redundant-commits' '
-- 2.19.0.612.g68a16e0245