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merge: save merge state earlier

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If the `git merge` process is killed while waiting for the editor to
finish, the merge state is lost but the prepared merge msg and tree is kept.
So, a subsequent `git commit` creates a squashed merge even when the
user asked for proper merge commit originally.

Demonstrate the problem with a test crafted after the in t7502. The test
requires EXECKEEPSPID (thus does not run under MINGW).

Save the merge state earlier (in the non-squash case) so that it does
not get lost. This makes the test pass.

Reported-by: hIpPy <hippy2981@gmail.com>
Signed-off-by: Michael J Gruber <git@grubix.eu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Michael J Gruber 2017-08-23 14:10:45 +02:00 committed by Junio C Hamano
parent 8e6a6bb360
commit 9d89b35526
2 changed files with 17 additions and 0 deletions
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2
builtin/merge.c
View file

@ -756,6 +756,7 @@ N_("Please enter a commit message to explain why this merge is necessary,\n"
"Lines starting with '%c' will be ignored, and an empty message aborts\n"
"the commit.\n");
static void write_merge_heads(struct commit_list *);
static void prepare_to_commit(struct commit_list *remoteheads)
{
struct strbuf msg = STRBUF_INIT;
@ -765,6 +766,7 @@ static void prepare_to_commit(struct commit_list *remoteheads)
BUG("the control must not reach here under --squash");
if (0 < option_edit)
strbuf_commented_addf(&msg, _(merge_editor_comment), comment_line_char);
write_merge_heads(remoteheads);
write_file_buf(git_path_merge_msg(), msg.buf, msg.len);
if (run_commit_hook(0 < option_edit, get_index_file(), "prepare-commit-msg",
git_path_merge_msg(), "merge", NULL))

15
t/t7600-merge.sh
View file

@ -774,4 +774,19 @@ test_expect_success 'merge can be completed with --continue' '
verify_parents $c0 $c1
'
write_script .git/FAKE_EDITOR <<EOF
# kill -TERM command added below.
EOF
test_expect_success EXECKEEPSPID 'killed merge can be completed with --continue' '
git reset --hard c0 &&
! "$SHELL_PATH" -c '\''
echo kill -TERM $$ >> .git/FAKE_EDITOR
GIT_EDITOR=.git/FAKE_EDITOR
export GIT_EDITOR
exec git merge --no-ff --edit c1'\'' &&
git merge --continue &&
verify_parents $c0 $c1
'
test_done