$ git clone -n https://src.fedoraproject.org/rpms/grilo.git /var/lib/mock/f45-build-13047-446/root/chroot_tmpdir/scmroot/grilo
Cloning into '/var/lib/mock/f45-build-13047-446/root/chroot_tmpdir/scmroot/grilo'...
$ git fetch origin d38c7742eb6ff187474d45d4fe8b05d4568ffaa5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/grilo
 * [new ref]         d38c7742eb6ff187474d45d4fe8b05d4568ffaa5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d38c774 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild