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Re: [PATCH 2/2] builtin/verify-tag: do not omit gpg on --format

On Sat, Apr 27, 2019 at 04:21:23PM -0400, santiago@xxxxxxx wrote:

> From: Santiago Torres <santiago@xxxxxxx>
> The current implementation of git-verify-tag omits the gpg output when
> the --format flag is passed. This may not be useful to users that want
> to see the gpg output *and* --format the output of git verify-tag.
> Instead, respect the --raw flag or the default gpg output.

Yep, this is just the matching change to patch 1. Makes sense.

> diff --git a/builtin/verify-tag.c b/builtin/verify-tag.c
> index 6fa04b751a..262e73cb45 100644
> --- a/builtin/verify-tag.c
> +++ b/builtin/verify-tag.c
> @@ -47,15 +47,13 @@ int cmd_verify_tag(int argc, const char **argv, const char *prefix)
>  	if (argc <= i)
>  		usage_with_options(verify_tag_usage, verify_tag_options);
> -	if (verbose)
> +	if (verbose && !format.format)
>  		flags |= GPG_VERIFY_VERBOSE;

Now this one's VERBOSE handling is a bit interesting. Previously we'd
set VERBOSE even if we were going to show a format.  And then later we
just set the OMIT_STATUS bit, leaving VERBOSE in place:


That _usually_ didn't matter because with OMIT_STATUS, we'd never enter
print_signature_buffer(), which is where VERBOSE would usually kick in.
But there's another spot we look at it:

  $ grep -nC2 VERBOSE tag.c 
  23-	if (size == payload_size) {
  24:		if (flags & GPG_VERIFY_VERBOSE)
  25-			write_in_full(1, buf, payload_size);
  26-		return error("no signature found");

So the code prior to your patch actually had another weird behavior. Try

  $ git verify-tag -v --format='my tag is %(tag)' v2.21.0
  my tag is v2.21.0

  $ git tag -m bar foo
  $ git verify-tag -v --format='my tag is %(tag)' foo
  object 66395b630f8ca08705b36c359415af8b25da9a11
  type commit
  tag foo
  tagger Jeff King <peff@xxxxxxxx> 1557387618 -0400
  error: no signature found

The "-v" only kicks in when there's an error. I think what your patch is
doing (consistently ignoring "-v" when there's a format) makes more
sense. It may be worth alerting the user when "-v" and "--format" are
used together (or arguably we should _always_ show "-v" if the user
really asked for it, but it does not make any sense to me for somebody
to do so).

> -	if (format.format) {
> +	if (format.format)
>  		if (verify_ref_format(&format))
>  			usage_with_options(verify_tag_usage,
>  					   verify_tag_options);
> -	}

This leaves us with a weird doubled conditional (with no braces
either!). Maybe:

  if (format.format && verify_ref_format(&format))


Other than that, the patch looks good. I think it could use a test in
t7030, though.