$ git clone -n https://src.fedoraproject.org/rpms/lbdb.git /var/lib/mock/f45-build-15635-477/root/chroot_tmpdir/scmroot/lbdb
Cloning into '/var/lib/mock/f45-build-15635-477/root/chroot_tmpdir/scmroot/lbdb'...
$ git fetch origin 6a4d0f193d6e38d0d1fbda139599b79c0f0f9761:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/lbdb
 * [new ref]         6a4d0f193d6e38d0d1fbda139599b79c0f0f9761 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6a4d0f1 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild