$ git clone -n https://src.fedoraproject.org/rpms/librcd.git /var/lib/mock/f45-build-16839-491/root/chroot_tmpdir/scmroot/librcd
Cloning into '/var/lib/mock/f45-build-16839-491/root/chroot_tmpdir/scmroot/librcd'...
$ git fetch origin ea8b69957f36296044b357ea0a3aeab4097574e8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/librcd
 * [new ref]         ea8b69957f36296044b357ea0a3aeab4097574e8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ea8b699 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild