$ git clone -n https://src.fedoraproject.org/rpms/paprefs.git /var/lib/mock/f45-build-21391-584/root/chroot_tmpdir/scmroot/paprefs
Cloning into '/var/lib/mock/f45-build-21391-584/root/chroot_tmpdir/scmroot/paprefs'...
$ git fetch origin ea5a90a4b7407f8f00816169d79ad8b648a89d3a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/paprefs
 * [new ref]         ea5a90a4b7407f8f00816169d79ad8b648a89d3a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ea5a90a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild