$ git clone -n https://src.fedoraproject.org/rpms/paperkey.git /var/lib/mock/f45-build-21364-584/root/chroot_tmpdir/scmroot/paperkey
Cloning into '/var/lib/mock/f45-build-21364-584/root/chroot_tmpdir/scmroot/paperkey'...
$ git fetch origin 68a06b07968a9973b2ca16c7343beac88be43f53:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/paperkey
 * [new ref]         68a06b07968a9973b2ca16c7343beac88be43f53 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 68a06b0 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild