[Libguestfs] [PATCH libnbd] podwrapper.pl.in: Use short commit date

[Eric Blake]

On Mon, Nov 29, 2021 at 03:37:47PM +0200, Nir Soffer wrote:
> > > >  if (!$date && -d $filename) {
> > > >      local $ENV{GIT_DIR} = $filename;
> > > > -    $_ = `git show -O/dev/null -s --format=%ci`;
> > > > -    $date = $1 if /^(\d+-\d+-\d+)\s/;
> > > > +    $date = `git show -O/dev/null -s --format=%cs`;
> > > >  }
> > > >  if (!$date) {
> > > >      my ($day, $month, $year) = (gmtime($ENV{SOURCE_DATE_EPOCH} || time))[3,4,5];
> > >
> > > This is fine.  Same patch should go into nbdkit too.
> >
> > Actually this caused a problem and I had to revert the commits in
> > nbdkit & libnbd.  See:
> >
> > https://gitlab.com/nbdkit/nbdkit/-/commit/750ad5972bb082d188f17f8f71ef1ec0c616c676
> 
> Sorry, I tested the generated man pages with "man /path/to/manpage" and
> they looked correct.
> 
> I think this should work:
> 
>  -    $_ = `git show -O/dev/null -s --format=%ci`;
>  +    $_ = `git show -O/dev/null -s --format=%cs`;

%cs is correct, but what you missed was that --format=%cs outputs
'yyyy-mm-dd\n', and the \n hurts.  Reading 'git format --help', that
is short for --format=tformat:%cs, but we need --format=format:%cs
(that is, we do not want the trailing newline).  I've reinstated your
patch as bdcf0765 on nbdkit, and will shortly follow up on libnbd.

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org