$ git clone -n https://src.fedoraproject.org/rpms/perl-Image-Xpm.git /var/lib/mock/f45-build-24292-603/root/chroot_tmpdir/scmroot/perl-Image-Xpm
Cloning into '/var/lib/mock/f45-build-24292-603/root/chroot_tmpdir/scmroot/perl-Image-Xpm'...
$ git fetch origin 46e0a145d68e01aa2707fceb15e33cf485dd1dfa:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Image-Xpm
 * [new ref]         46e0a145d68e01aa2707fceb15e33cf485dd1dfa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 46e0a14 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild