$ git clone -n https://src.fedoraproject.org/rpms/perl-XML-Spice.git /var/lib/mock/f45-build-27541-624/root/chroot_tmpdir/scmroot/perl-XML-Spice
Cloning into '/var/lib/mock/f45-build-27541-624/root/chroot_tmpdir/scmroot/perl-XML-Spice'...
$ git fetch origin a512b79e28c0a86e3a2e4720886326a0c128017b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-XML-Spice
 * [new ref]         a512b79e28c0a86e3a2e4720886326a0c128017b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a512b79 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild