$ git clone -n https://src.fedoraproject.org/rpms/perl-XML-RegExp.git /var/lib/mock/f45-build-27529-624/root/chroot_tmpdir/scmroot/perl-XML-RegExp
Cloning into '/var/lib/mock/f45-build-27529-624/root/chroot_tmpdir/scmroot/perl-XML-RegExp'...
$ git fetch origin b08ddfddce02e3ea60d655ad5e81d3266c470948:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-XML-RegExp
 * [new ref]         b08ddfddce02e3ea60d655ad5e81d3266c470948 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b08ddfd Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild