Re: [PATCH v3] cherry-pick: make sure all input objects are commits

[Junio C Hamano <gitster@pobox.com>]

Junio C Hamano <gitster@pobox.com> writes:

> Miklos Vajna <vmiklos@suse.cz> writes:
>
>> When a single argument was a non-commit, the error message used to be:
>>
>> 	fatal: BUG: expected exactly one commit from walk
>>
>> For multiple arguments, when none of the arguments was a commit, the error was:
>>
>> 	fatal: empty commit set passed
>>
>> Finally, when some of the arguments were non-commits, we ignored those
>> arguments.  Fix this bug and make sure all arguments are commits, and
>> for the first non-commit, error out with:
>>
>> 	fatal: <name>: Can't cherry-pick a <type>
>>
>> Signed-off-by: Miklos Vajna <vmiklos@suse.cz>
>
> This turns out to be an irritatingly stupid change.  While I am
> rebuilding a privately tagged tip of 'maint', I am seeing:
>
> 	fatal: v1.8.2.3: Can't cherry-pick a tag
>
> You would want to reject non committish, not non commit.

I'd apply this before -rc2.  I _think_ it is also OK to just let
lookup_commit_reference_gently() barf with its standard message

	error: Object %s is a %s, not a commit

without an extra sha1_object_info() call in the error codepath, but
I did not bother, as this is meant to be an emergency fix.

-- >8 --
Subject: cherry-pick: picking a tag that resolves to a commit is OK

Earlier, 21246dbb9e0a (cherry-pick: make sure all input objects are
commits, 2013-04-11) tried to catch an unlikely "git cherry-pick $blob"
as an error, but broke a more important use case to cherry-pick a
tag that points at a commit.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 sequencer.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/sequencer.c b/sequencer.c
index 61fdb68..f2c9d98 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -1077,10 +1077,10 @@ int sequencer_pick_revisions(struct replay_opts *opts)
 			continue;
 
 		if (!get_sha1(name, sha1)) {
-			enum object_type type = sha1_object_info(sha1, NULL);
-
-			if (type > 0 && type != OBJ_COMMIT)
+			if (!lookup_commit_reference_gently(sha1, 1)) {
+				enum object_type type = sha1_object_info(sha1, NULL);
 				die(_("%s: can't cherry-pick a %s"), name, typename(type));
+			}
 		} else
 			die(_("%s: bad revision"), name);
 	}