$ git clone -n https://src.fedoraproject.org/rpms/ghc-concurrent-extra.git /var/lib/mock/f45-build-10117-413/root/chroot_tmpdir/scmroot/ghc-concurrent-extra
Cloning into '/var/lib/mock/f45-build-10117-413/root/chroot_tmpdir/scmroot/ghc-concurrent-extra'...
$ git fetch origin e6644e5097acae7c15a0d3da42a308554db295b1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-concurrent-extra
 * [new ref]         e6644e5097acae7c15a0d3da42a308554db295b1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e6644e5 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild