$ git clone -n https://src.fedoraproject.org/rpms/lookup.git /var/lib/mock/f45-build-17523-501/root/chroot_tmpdir/scmroot/lookup
Cloning into '/var/lib/mock/f45-build-17523-501/root/chroot_tmpdir/scmroot/lookup'...
$ git fetch origin 064d847d29192bd3ef50ad4af0f37b150d45053a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/lookup
 * [new ref]         064d847d29192bd3ef50ad4af0f37b150d45053a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 064d847 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild