$ git clone -n https://src.fedoraproject.org/rpms/renrot.git /var/lib/mock/f45-build-34462-687/root/chroot_tmpdir/scmroot/renrot
Cloning into '/var/lib/mock/f45-build-34462-687/root/chroot_tmpdir/scmroot/renrot'...
$ git fetch origin 9a15747a94c58a4713e9a77b3f5198413f5a3f8c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/renrot
 * [new ref]         9a15747a94c58a4713e9a77b3f5198413f5a3f8c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9a15747 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild