Re: surprising error message in parse_opt_with_commit

["Shawn O. Pearce" <spearce@spearce.org>]

Tim Harper <timcharper@gmail.com> wrote:
>  610 int parse_opt_with_commit(const struct option *opt, const char
> *arg, int unset)
>  611 {
>  612 	unsigned char sha1[20];
>  613 	struct commit *commit;
>  614
>  615 	if (!arg)
>  616 		return -1;
>  617 	if (get_sha1(arg, sha1))
>  618 		return error("malformed object name %s", arg);
>  619 	commit = lookup_commit_reference(sha1);
>  620 	if (!commit)
>  621 		return error("no such commit %s", arg);
>  622 	commit_list_insert(commit, opt->value);
>  623 	return 0;
>  624 }
> 
> It appears the get_sha1 call is returning true, causing the 'malformed
> object name' error to be returned.  However, it seems that ideally
> since efabdfb is not malformed (it would be a valid ref if it
> existed), the execution path should continue to line 619, receive no
> commit, and fail on 621.

get_sha1 is responsible for expanding an abbreviated ID to the
full ID.  If it can't do the expansion, it errors out.  The code
is correct as-is, though the error message on 618 is a bit odd.

-- 
Shawn.