Commit 7902b727 authored by Junio C Hamano's avatar Junio C Hamano

Merge branch 'sb/sequencer-abort-safety' into maint

Unlike "git am --abort", "git cherry-pick --abort" moved HEAD back
to where cherry-pick started while picking multiple changes, when
the cherry-pick stopped to ask for help from the user, and the user
did "git reset --hard" to a different commit in order to re-attempt
the operation.

* sb/sequencer-abort-safety:
  Revert "sequencer: remove useless get_dir() function"
  sequencer: remove useless get_dir() function
  sequencer: make sequencer abort safer
  t3510: test that cherry-pick --abort does not unsafely change HEAD
  am: change safe_to_abort()'s not rewinding error into a warning
  am: fix filename in safe_to_abort() error message
parents 6d1f93ac ce73bb22
......@@ -2124,7 +2124,7 @@ static int safe_to_abort(const struct am_state *state)
if (read_state_file(&sb, state, "abort-safety", 1) > 0) {
if (get_oid_hex(sb.buf, &abort_safety))
die(_("could not parse %s"), am_path(state, "abort_safety"));
die(_("could not parse %s"), am_path(state, "abort-safety"));
} else
oidclr(&abort_safety);
......@@ -2134,7 +2134,7 @@ static int safe_to_abort(const struct am_state *state)
if (!oidcmp(&head, &abort_safety))
return 1;
error(_("You seem to have moved HEAD since the last 'am' failure.\n"
warning(_("You seem to have moved HEAD since the last 'am' failure.\n"
"Not rewinding to ORIG_HEAD"));
return 0;
......
......@@ -27,6 +27,7 @@ GIT_PATH_FUNC(git_path_seq_dir, "sequencer")
static GIT_PATH_FUNC(git_path_todo_file, "sequencer/todo")
static GIT_PATH_FUNC(git_path_opts_file, "sequencer/opts")
static GIT_PATH_FUNC(git_path_head_file, "sequencer/head")
static GIT_PATH_FUNC(git_path_abort_safety_file, "sequencer/abort-safety")
/*
* A script to set the GIT_AUTHOR_NAME, GIT_AUTHOR_EMAIL, and
......@@ -310,6 +311,20 @@ static int error_dirty_index(struct replay_opts *opts)
return -1;
}
static void update_abort_safety_file(void)
{
struct object_id head;
/* Do nothing on a single-pick */
if (!file_exists(git_path_seq_dir()))
return;
if (!get_oid("HEAD", &head))
write_file(git_path_abort_safety_file(), "%s", oid_to_hex(&head));
else
write_file(git_path_abort_safety_file(), "%s", "");
}
static int fast_forward_to(const unsigned char *to, const unsigned char *from,
int unborn, struct replay_opts *opts)
{
......@@ -339,6 +354,7 @@ static int fast_forward_to(const unsigned char *to, const unsigned char *from,
strbuf_release(&sb);
strbuf_release(&err);
ref_transaction_free(transaction);
update_abort_safety_file();
return 0;
}
......@@ -813,6 +829,7 @@ static int do_pick_commit(enum todo_command command, struct commit *commit,
leave:
free_message(commit, &msg);
update_abort_safety_file();
return res;
}
......@@ -1132,9 +1149,34 @@ static int save_head(const char *head)
return 0;
}
static int rollback_is_safe(void)
{
struct strbuf sb = STRBUF_INIT;
struct object_id expected_head, actual_head;
if (strbuf_read_file(&sb, git_path_abort_safety_file(), 0) >= 0) {
strbuf_trim(&sb);
if (get_oid_hex(sb.buf, &expected_head)) {
strbuf_release(&sb);
die(_("could not parse %s"), git_path_abort_safety_file());
}
strbuf_release(&sb);
}
else if (errno == ENOENT)
oidclr(&expected_head);
else
die_errno(_("could not read '%s'"), git_path_abort_safety_file());
if (get_oid("HEAD", &actual_head))
oidclr(&actual_head);
return !oidcmp(&actual_head, &expected_head);
}
static int reset_for_rollback(const unsigned char *sha1)
{
const char *argv[4]; /* reset --merge <arg> + NULL */
argv[0] = "reset";
argv[1] = "--merge";
argv[2] = sha1_to_hex(sha1);
......@@ -1189,6 +1231,12 @@ int sequencer_rollback(struct replay_opts *opts)
error(_("cannot abort from a branch yet to be born"));
goto fail;
}
if (!rollback_is_safe()) {
/* Do not error, just do not rollback */
warning(_("You seem to have moved HEAD. "
"Not rewinding, check your HEAD!"));
} else
if (reset_for_rollback(sha1))
goto fail;
strbuf_release(&buf);
......@@ -1393,6 +1441,7 @@ int sequencer_pick_revisions(struct replay_opts *opts)
return -1;
if (save_opts(opts))
return -1;
update_abort_safety_file();
res = pick_commits(&todo_list, opts);
todo_list_release(&todo_list);
return res;
......
......@@ -147,6 +147,16 @@ test_expect_success '--abort to cancel single cherry-pick' '
git diff-index --exit-code HEAD
'
test_expect_success '--abort does not unsafely change HEAD' '
pristine_detach initial &&
test_must_fail git cherry-pick picked anotherpick &&
git reset --hard base &&
test_must_fail git cherry-pick picked anotherpick &&
git cherry-pick --abort 2>actual &&
test_i18ngrep "You seem to have moved HEAD" actual &&
test_cmp_rev base HEAD
'
test_expect_success 'cherry-pick --abort to cancel multiple revert' '
pristine_detach anotherpick &&
test_expect_code 1 git revert base..picked &&
......
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