$ git clone -n https://src.fedoraproject.org/rpms/ghc-contravariant.git /var/lib/mock/f41-build-837905-159471/root/chroot_tmpdir/scmroot/ghc-contravariant
Cloning into '/var/lib/mock/f41-build-837905-159471/root/chroot_tmpdir/scmroot/ghc-contravariant'...
$ git fetch origin 1b147fe0c6ca2439489dc15b2792ad385ba7dd60:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-contravariant
 * [new ref]         1b147fe0c6ca2439489dc15b2792ad385ba7dd60 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1b147fe bump release