$ git clone -n https://src.fedoraproject.org/rpms/trunk.git /var/lib/mock/f45-build-46466-835/root/chroot_tmpdir/scmroot/trunk
Cloning into '/var/lib/mock/f45-build-46466-835/root/chroot_tmpdir/scmroot/trunk'...
$ git fetch origin a1d38516f99e077f68daebbb264bb033c5a473fd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/trunk
 * [new ref]         a1d38516f99e077f68daebbb264bb033c5a473fd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a1d3851 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild