revert: introduce --abort to cancel a failed cherry-pick
After running some ill-advised command like "git cherry-pick
HEAD..linux-next", the bewildered novice may want to return to more
familiar territory. Introduce a "git cherry-pick --abort" command
that rolls back the entire cherry-pick sequence and places the
repository back on solid ground.
Just like "git merge --abort", this internally uses "git reset
--merge", so local changes not involved in the conflict resolution are
preserved.
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/builtin/revert.c b/builtin/revert.c
index f5ba67a..70a5fbb 100644
--- a/builtin/revert.c
+++ b/builtin/revert.c
@@ -40,7 +40,12 @@
};
enum replay_action { REVERT, CHERRY_PICK };
-enum replay_subcommand { REPLAY_NONE, REPLAY_REMOVE_STATE, REPLAY_CONTINUE };
+enum replay_subcommand {
+ REPLAY_NONE,
+ REPLAY_REMOVE_STATE,
+ REPLAY_CONTINUE,
+ REPLAY_ROLLBACK
+};
struct replay_opts {
enum replay_action action;
@@ -135,9 +140,11 @@
const char *me = action_name(opts);
int remove_state = 0;
int contin = 0;
+ int rollback = 0;
struct option options[] = {
OPT_BOOLEAN(0, "quit", &remove_state, "end revert or cherry-pick sequence"),
OPT_BOOLEAN(0, "continue", &contin, "resume revert or cherry-pick sequence"),
+ OPT_BOOLEAN(0, "abort", &rollback, "cancel revert or cherry-pick sequence"),
OPT_BOOLEAN('n', "no-commit", &opts->no_commit, "don't automatically commit"),
OPT_BOOLEAN('e', "edit", &opts->edit, "edit the commit message"),
OPT_NOOP_NOARG('r', NULL),
@@ -173,6 +180,7 @@
verify_opt_mutually_compatible(me,
"--quit", remove_state,
"--continue", contin,
+ "--abort", rollback,
NULL);
/* Set the subcommand */
@@ -180,6 +188,8 @@
opts->subcommand = REPLAY_REMOVE_STATE;
else if (contin)
opts->subcommand = REPLAY_CONTINUE;
+ else if (rollback)
+ opts->subcommand = REPLAY_ROLLBACK;
else
opts->subcommand = REPLAY_NONE;
@@ -188,8 +198,12 @@
char *this_operation;
if (opts->subcommand == REPLAY_REMOVE_STATE)
this_operation = "--quit";
- else
+ else if (opts->subcommand == REPLAY_CONTINUE)
this_operation = "--continue";
+ else {
+ assert(opts->subcommand == REPLAY_ROLLBACK);
+ this_operation = "--abort";
+ }
verify_opt_compatible(me, this_operation,
"--no-commit", opts->no_commit,
@@ -850,7 +864,7 @@
if (file_exists(seq_dir)) {
error(_("a cherry-pick or revert is already in progress"));
- advise(_("try \"git cherry-pick (--continue | --quit)\""));
+ advise(_("try \"git cherry-pick (--continue | --quit | --abort)\""));
return -1;
}
else if (mkdir(seq_dir, 0777) < 0)
@@ -873,6 +887,71 @@
die(_("Error wrapping up %s."), head_file);
}
+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);
+ argv[3] = NULL;
+ return run_command_v_opt(argv, RUN_GIT_CMD);
+}
+
+static int rollback_single_pick(void)
+{
+ unsigned char head_sha1[20];
+
+ if (!file_exists(git_path("CHERRY_PICK_HEAD")) &&
+ !file_exists(git_path("REVERT_HEAD")))
+ return error(_("no cherry-pick or revert in progress"));
+ if (!resolve_ref("HEAD", head_sha1, 0, NULL))
+ return error(_("cannot resolve HEAD"));
+ if (is_null_sha1(head_sha1))
+ return error(_("cannot abort from a branch yet to be born"));
+ return reset_for_rollback(head_sha1);
+}
+
+static int sequencer_rollback(struct replay_opts *opts)
+{
+ const char *filename;
+ FILE *f;
+ unsigned char sha1[20];
+ struct strbuf buf = STRBUF_INIT;
+
+ filename = git_path(SEQ_HEAD_FILE);
+ f = fopen(filename, "r");
+ if (!f && errno == ENOENT) {
+ /*
+ * There is no multiple-cherry-pick in progress.
+ * If CHERRY_PICK_HEAD or REVERT_HEAD indicates
+ * a single-cherry-pick in progress, abort that.
+ */
+ return rollback_single_pick();
+ }
+ if (!f)
+ return error(_("cannot open %s: %s"), filename,
+ strerror(errno));
+ if (strbuf_getline(&buf, f, '\n')) {
+ error(_("cannot read %s: %s"), filename, ferror(f) ?
+ strerror(errno) : _("unexpected end of file"));
+ goto fail;
+ }
+ if (get_sha1_hex(buf.buf, sha1) || buf.buf[40] != '\0') {
+ error(_("stored pre-cherry-pick HEAD file '%s' is corrupt"),
+ filename);
+ goto fail;
+ }
+ if (reset_for_rollback(sha1))
+ goto fail;
+ strbuf_release(&buf);
+ fclose(f);
+ return 0;
+fail:
+ strbuf_release(&buf);
+ fclose(f);
+ return -1;
+}
+
static void save_todo(struct commit_list *todo_list, struct replay_opts *opts)
{
const char *todo_file = git_path(SEQ_TODO_FILE);
@@ -977,6 +1056,8 @@
remove_sequencer_state(1);
return 0;
}
+ if (opts->subcommand == REPLAY_ROLLBACK)
+ return sequencer_rollback(opts);
if (opts->subcommand == REPLAY_CONTINUE) {
if (!file_exists(git_path(SEQ_TODO_FILE)))
return error(_("No %s in progress"), action_name(opts));
