$ git clone -n https://src.fedoraproject.org/rpms/perl-CSS.git /var/lib/mock/f45-build-22100-589/root/chroot_tmpdir/scmroot/perl-CSS
Cloning into '/var/lib/mock/f45-build-22100-589/root/chroot_tmpdir/scmroot/perl-CSS'...
$ git fetch origin c9aa07ab13d54de3aaa9133208b5d699992a102c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-CSS
 * [new ref]         c9aa07ab13d54de3aaa9133208b5d699992a102c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c9aa07a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild