$ git clone -n https://src.fedoraproject.org/rpms/ghc-text-metrics.git /var/lib/mock/f39-build-2116098-50693/root/chroot_tmpdir/scmroot/ghc-text-metrics
Cloning into '/var/lib/mock/f39-build-2116098-50693/root/chroot_tmpdir/scmroot/ghc-text-metrics'...
$ git fetch origin 96500dca619f9bc5daa387c29fb77ad9cafcef9c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-text-metrics
 * [new ref]         96500dca619f9bc5daa387c29fb77ad9cafcef9c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 96500dc add revision