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

[Jeff King <peff@peff.net>]

On Tue, Jun 07, 2016 at 03:05:50PM -0700, Junio C Hamano wrote:

> Jeff King <peff@peff.net> writes:
> 
> > On Tue, Jun 07, 2016 at 02:50:23PM -0700, Junio C Hamano wrote:
> >
> >> >> Or it could even do this:
> >> >> 
> >> >> 	tag="$1"
> >> >> 	if ! git tag -v "$tag"
> >> >> 	if ! git tag -v "$tag"
> >> >>         then
> >> >> 		echo >&2 "Bad tag."
> >> >>                 exit 1
> >> >> 	fi
> >> >> +	tag=$(git tag --show-tagname $tag)
> >> >> 	make dest=/usr/local/$package/$tag install
> >> >
> >> > It is racy. That probably doesn't matter for most callers, but it would
> >> > be nice to be able to get a custom format out of the "-v" invocation.
> >> 
> >> Heh, you can do
> >> 
> >> -	tag="$1"
> >> +	tag=$(git rev-parse --verify "$1")
> >> 
> >> upfront and it no longer is racy, no?
> >
> > Yes, though that doesn't quite work today. The formatted output comes
> > from "tag -l", which wants a refname.
> 
> Puzzled.  I didn't even use --format=%(tagname) in the above.

No, but you used --show-tagname, which does not exist today (and which
IMHO should be implemented as --format). Would --show-tagname take
either a tagname _or_ a sha1? I assume it would not be calling
get_sha1(), as having it find refs/heads/$tag would be silly.

-Peff