$ git clone -n https://src.fedoraproject.org/rpms/cabal-rpm.git /var/lib/mock/f38-build-side-42-init-devel-929521-28746/root/chroot_tmpdir/scmroot/cabal-rpm
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-929521-28746/root/chroot_tmpdir/scmroot/cabal-rpm'...
$ git fetch origin c21db5cea0f22187100a26f65fc5f9d914606ed4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cabal-rpm
 * [new ref]         c21db5cea0f22187100a26f65fc5f9d914606ed4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c21db5c update to 2.1.0