revert: allow reverting a root commit

Although it is probably an uncommon operation, there is no
reason to disallow it, as it works just fine. It is the
reverse of a cherry-pick of a root commit, which is already
allowed.

We do have to tweak one check on whether we have a merge
commit, which assumed we had at least one parent.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King 2011-05-12 07:09:55 -04:00 committed by Junio C Hamano
parent 161807349a
commit fad2652673

View File

@ -408,8 +408,6 @@ static int do_pick_commit(void)
discard_cache();
if (!commit->parents) {
if (action == REVERT)
die (_("Cannot revert a root commit"));
parent = NULL;
}
else if (commit->parents->next) {
@ -467,7 +465,7 @@ static int do_pick_commit(void)
strbuf_addstr(&msgbuf, "\"\n\nThis reverts commit ");
strbuf_addstr(&msgbuf, sha1_to_hex(commit->object.sha1));
if (commit->parents->next) {
if (commit->parents && commit->parents->next) {
strbuf_addstr(&msgbuf, ", reversing\nchanges made to ");
strbuf_addstr(&msgbuf, sha1_to_hex(parent->object.sha1));
}