Re: [RFC/PATCH] verify-tag: add --check-name flag

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On Tue, Jun 07, 2016 at 05:08:56PM -0400, Jeff King wrote:
> On Tue, Jun 07, 2016 at 03:56:08PM -0400, santiago@xxxxxxx wrote:
> 
> > diff --git a/tag.c b/tag.c
> > index d1dcd18..591b31e 100644
> > --- a/tag.c
> > +++ b/tag.c
> > @@ -55,6 +55,14 @@ int gpg_verify_tag(const unsigned char *sha1, const char *name_to_report,
> >  
> >  	ret = run_gpg_verify(buf, size, flags);
> >  
> > +	if (flags & TAG_VERIFY_NAME) {
> > +		struct tag tag_info;
> > +		ret += parse_tag_buffer(&tag_info, buf, size);
> > +		if strncmp(tag_info.tag, name_to_report, size)
> > +			ret += error("tag name doesn't match tag header!(%s)",
> > +					tag_info.tag);
> > +	}
> 
> Er, is this C? :)

Yeah, I promise this would be a "cleaner" patch in the future :P

> 
> I think the general idea of an option to check the tag-name is a good
> one. But there are some corner cases to think about:
> 
>   1. What name are we comparing against? Presumably it comes from the
>      name the user gave us that resolved to the tag object. We would
>      want to shorten "refs/tags/v1.4" to just "v1.4", I would think.
> 
>      Would a user ever want to pass a different tagname?

Yeah, I was wondering this. It might be convenient for them to call

git verify-tag --check-name [name] [ref] 

In case the ref doesn't match the tag. I can do it either way, although
the second case would be cumbersome.

> 
>   2. What do we do for non-annotated tags? Is it always a failure?

Right now, verify-tag fails with non-annotated tags like this: 

    santiago at ~/.../git ✔ ./git-verify-tag master
    error: master: cannot verify a non-tag object of type commit.

Although we could change this behavior. I would have to check how git
tag -v works as this behavior might change.

> 
> -Peff
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