diff options
author | Phillip Wood <phillip.wood@dunelm.org.uk> | 2021-08-20 15:40:37 +0000 |
---|---|---|
committer | Junio C Hamano <gitster@pobox.com> | 2021-08-23 09:36:30 -0700 |
commit | baf8ec8d3a0327307f79efd31d5717a0c91c4d8c (patch) | |
tree | 5e4ff4c2e0801cc72ea24144f0c078748d759530 | |
parent | rebase -i: add another reword test (diff) | |
download | tgif-baf8ec8d3a0327307f79efd31d5717a0c91c4d8c.tar.xz |
rebase -r: don't write .git/MERGE_MSG when fast-forwarding
When fast-forwarding we do not create a new commit so .git/MERGE_MSG
is not removed and can end up seeding the message of a commit made
after the rebase has finished. Avoid writing .git/MERGE_MSG when we
are fast-forwarding by writing the file after the fast-forward
checks. Note that there are no changes to the fast-forward code, it is
simply moved.
Note that the way this change is implemented means we no longer write
the author script when fast-forwarding either. I believe this is safe
for the reasons below but it is a departure from what we do when
fast-forwarding a non-merge commit. If we reword the merge then 'git
commit --amend' will keep the authorship of the commit we're rewording
as it ignores GIT_AUTHOR_* unless --reset-author is passed. It will
also export the correct GIT_AUTHOR_* variables to any hooks and we
already test the authorship of the reworded commit. If we are not
rewording then we no longer call spilt_ident() which means we are no
longer checking the commit author header looks sane. However this is
what we already do when fast-forwarding non-merge commits in
skip_unnecessary_picks() so I don't think we're breaking any promises
by not checking the author here.
Reported-by: SZEDER Gábor <szeder.dev@gmail.com>
Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
-rw-r--r-- | sequencer.c | 81 | ||||
-rw-r--r-- | t/lib-rebase.sh | 10 |
2 files changed, 49 insertions, 42 deletions
diff --git a/sequencer.c b/sequencer.c index cc8a361cce..c2cba5ed4b 100644 --- a/sequencer.c +++ b/sequencer.c @@ -983,7 +983,8 @@ static int run_git_commit(const char *defmsg, cmd.git_cmd = 1; - if (is_rebase_i(opts) && read_env_script(&cmd.env_array)) { + if (is_rebase_i(opts) && !(!defmsg && (flags & AMEND_MSG)) && + read_env_script(&cmd.env_array)) { const char *gpg_opt = gpg_sign_opt_quoted(opts); return error(_(staged_changes_advice), @@ -3815,6 +3816,45 @@ static int do_merge(struct repository *r, goto leave_merge; } + /* + * If HEAD is not identical to the first parent of the original merge + * commit, we cannot fast-forward. + */ + can_fast_forward = opts->allow_ff && commit && commit->parents && + oideq(&commit->parents->item->object.oid, + &head_commit->object.oid); + + /* + * If any merge head is different from the original one, we cannot + * fast-forward. + */ + if (can_fast_forward) { + struct commit_list *p = commit->parents->next; + + for (j = to_merge; j && p; j = j->next, p = p->next) + if (!oideq(&j->item->object.oid, + &p->item->object.oid)) { + can_fast_forward = 0; + break; + } + /* + * If the number of merge heads differs from the original merge + * commit, we cannot fast-forward. + */ + if (j || p) + can_fast_forward = 0; + } + + if (can_fast_forward) { + rollback_lock_file(&lock); + ret = fast_forward_to(r, &commit->object.oid, + &head_commit->object.oid, 0, opts); + if (flags & TODO_EDIT_MERGE_MSG) + goto fast_forward_edit; + + goto leave_merge; + } + if (commit) { const char *encoding = get_commit_output_encoding(); const char *message = logmsg_reencode(commit, NULL, encoding); @@ -3864,45 +3904,6 @@ static int do_merge(struct repository *r, } } - /* - * If HEAD is not identical to the first parent of the original merge - * commit, we cannot fast-forward. - */ - can_fast_forward = opts->allow_ff && commit && commit->parents && - oideq(&commit->parents->item->object.oid, - &head_commit->object.oid); - - /* - * If any merge head is different from the original one, we cannot - * fast-forward. - */ - if (can_fast_forward) { - struct commit_list *p = commit->parents->next; - - for (j = to_merge; j && p; j = j->next, p = p->next) - if (!oideq(&j->item->object.oid, - &p->item->object.oid)) { - can_fast_forward = 0; - break; - } - /* - * If the number of merge heads differs from the original merge - * commit, we cannot fast-forward. - */ - if (j || p) - can_fast_forward = 0; - } - - if (can_fast_forward) { - rollback_lock_file(&lock); - ret = fast_forward_to(r, &commit->object.oid, - &head_commit->object.oid, 0, opts); - if (flags & TODO_EDIT_MERGE_MSG) - goto fast_forward_edit; - - goto leave_merge; - } - if (strategy || to_merge->next) { /* Octopus merge */ struct child_process cmd = CHILD_PROCESS_INIT; diff --git a/t/lib-rebase.sh b/t/lib-rebase.sh index 99d9e7efd2..ec6b9b107d 100644 --- a/t/lib-rebase.sh +++ b/t/lib-rebase.sh @@ -173,10 +173,16 @@ set_reword_editor () { write_script reword-editor.sh <<-EOF && # Save the oid of the first reworded commit so we can check rebase - # fast-forwards to it + # fast-forwards to it. Also check that we do not write .git/MERGE_MSG + # when fast-forwarding if ! test -s reword-oid then - git rev-parse HEAD >reword-oid + git rev-parse HEAD >reword-oid && + if test -f .git/MERGE_MSG + then + echo 1>&2 "error: .git/MERGE_MSG exists" + exit 1 + fi fi && # There should be no uncommited changes git diff --exit-code HEAD && |