$ git clone -n https://src.fedoraproject.org/rpms/remake.git /var/lib/mock/f45-build-34460-687/root/chroot_tmpdir/scmroot/remake
Cloning into '/var/lib/mock/f45-build-34460-687/root/chroot_tmpdir/scmroot/remake'...
$ git fetch origin 931a8fbc192b37aeb75a99aad67a723d955da99a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/remake
 * [new ref]         931a8fbc192b37aeb75a99aad67a723d955da99a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 931a8fb Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild