$ git clone -n https://src.fedoraproject.org/rpms/fetch-crl.git /var/lib/mock/f45-build-8924-397/root/chroot_tmpdir/scmroot/fetch-crl
Cloning into '/var/lib/mock/f45-build-8924-397/root/chroot_tmpdir/scmroot/fetch-crl'...
$ git fetch origin d5957a3e64beca5640d81639e5f0959fa172365b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fetch-crl
 * [new ref]         d5957a3e64beca5640d81639e5f0959fa172365b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d5957a3 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild