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rebase -r: make 'merge -c' behave like reword

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If the user runs git log while rewording a commit it is confusing if
sometimes we're amending the commit that's being reworded and at other
times we're creating a new commit depending on whether we could
fast-forward or not[1]. For this reason the reword command ensures
that there are no uncommitted changes when rewording. The reword
command also allows the user to edit the todo list while the rebase is
paused. As 'merge -c' also rewords commits make it behave like reword
and add a test.

[1] https://lore.kernel.org/git/xmqqlfvu4be3.fsf@gitster-ct.c.googlers.com/T/#m133009cb91cf0917bcf667300f061178be56680a

Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Phillip Wood
2021-08-20 15:40:35 +00:00
committed by Junio C Hamano
parent 5d213e46bb
commit 2be6b6f411
3 changed files with 75 additions and 19 deletions
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24
sequencer.c
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@ -3739,10 +3739,9 @@ static struct commit *lookup_label(const char *label, int len,
static int do_merge(struct repository *r,
struct commit *commit,
const char *arg, int arg_len,
int flags, struct replay_opts *opts)
int flags, int *check_todo, struct replay_opts *opts)
{
int run_commit_flags = (flags & TODO_EDIT_MERGE_MSG) ?
EDIT_MSG | VERIFY_MSG : 0;
int run_commit_flags = 0;
struct strbuf ref_name = STRBUF_INIT;
struct commit *head_commit, *merge_commit, *i;
struct commit_list *bases, *j, *reversed = NULL;
@ -3898,10 +3897,9 @@ static int do_merge(struct repository *r,
rollback_lock_file(&lock);
ret = fast_forward_to(r, &commit->object.oid,
&head_commit->object.oid, 0, opts);
if (flags & TODO_EDIT_MERGE_MSG) {
run_commit_flags |= AMEND_MSG;
if (flags & TODO_EDIT_MERGE_MSG)
goto fast_forward_edit;
}
goto leave_merge;
}
@ -4035,10 +4033,17 @@ static int do_merge(struct repository *r,
* value (a negative one would indicate that the `merge`
* command needs to be rescheduled).
*/
fast_forward_edit:
ret = !!run_git_commit(git_path_merge_msg(r), opts,
run_commit_flags);
if (!ret && flags & TODO_EDIT_MERGE_MSG) {
fast_forward_edit:
*check_todo = 1;
run_commit_flags |= AMEND_MSG | EDIT_MSG | VERIFY_MSG;
ret = !!run_git_commit(NULL, opts, run_commit_flags);
}
leave_merge:
strbuf_release(&ref_name);
rollback_lock_file(&lock);
@ -4405,9 +4410,8 @@ static int pick_commits(struct repository *r,
if ((res = do_reset(r, arg, item->arg_len, opts)))
reschedule = 1;
} else if (item->command == TODO_MERGE) {
if ((res = do_merge(r, item->commit,
arg, item->arg_len,
item->flags, opts)) < 0)
if ((res = do_merge(r, item->commit, arg, item->arg_len,
item->flags, &check_todo, opts)) < 0)
reschedule = 1;
else if (item->commit)
record_in_rewritten(&item->commit->object.oid,