$ git clone -n https://src.fedoraproject.org/rpms/ghc-concatenative.git /var/lib/mock/f45-build-10113-413/root/chroot_tmpdir/scmroot/ghc-concatenative
Cloning into '/var/lib/mock/f45-build-10113-413/root/chroot_tmpdir/scmroot/ghc-concatenative'...
$ git fetch origin fcc5533b98385e777629065cb1895167ab99a0a2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-concatenative
 * [new ref]         fcc5533b98385e777629065cb1895167ab99a0a2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fcc5533 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild