$ git clone -n https://src.fedoraproject.org/rpms/ghc-text-metrics.git /var/lib/mock/f41-build-839474-160201/root/chroot_tmpdir/scmroot/ghc-text-metrics
Cloning into '/var/lib/mock/f41-build-839474-160201/root/chroot_tmpdir/scmroot/ghc-text-metrics'...
$ git fetch origin 840e4b212970289a5cbd7c3bdb06549396781b6b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-text-metrics
 * [new ref]         840e4b212970289a5cbd7c3bdb06549396781b6b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 840e4b2 refresh .cabal revision