$ git clone -n https://src.fedoraproject.org/rpms/rubygem-allison.git /var/lib/mock/f45-build-34777-691/root/chroot_tmpdir/scmroot/rubygem-allison
Cloning into '/var/lib/mock/f45-build-34777-691/root/chroot_tmpdir/scmroot/rubygem-allison'...
$ git fetch origin c6fc273cc504baf0b52fcf7b187064a42502d15c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-allison
 * [new ref]         c6fc273cc504baf0b52fcf7b187064a42502d15c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c6fc273 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild