$ git clone -n https://src.fedoraproject.org/rpms/gtk-v4l.git /var/lib/mock/f29-build-3120-857/root/thebuilddir/tmp/scmroot/gtk-v4l
Cloning into '/var/lib/mock/f29-build-3120-857/root/thebuilddir/tmp/scmroot/gtk-v4l'...
$ git reset --hard 4d7d9814a8dc9c0e70bd1fdf02205fc565f69733
HEAD is now at 4d7d981 - Rebuilt for https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild