$ git clone -n https://src.fedoraproject.org/rpms/ghc-koji.git /var/lib/mock/f41-build-840824-160968/root/chroot_tmpdir/scmroot/ghc-koji
Cloning into '/var/lib/mock/f41-build-840824-160968/root/chroot_tmpdir/scmroot/ghc-koji'...
$ git fetch origin 493e945a489b88d630fbafb9da31360df83bf729:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-koji
 * [new ref]         493e945a489b88d630fbafb9da31360df83bf729 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 493e945 bump release