$ git clone -n https://src.fedoraproject.org/rpms/xmonad.git /var/lib/mock/f41-build-839116-159994/root/chroot_tmpdir/scmroot/xmonad
Cloning into '/var/lib/mock/f41-build-839116-159994/root/chroot_tmpdir/scmroot/xmonad'...
$ git fetch origin f682dce813a34f3c5ce0c31940a51694d949f824:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xmonad
 * [new ref]         f682dce813a34f3c5ce0c31940a51694d949f824 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f682dce https://hackage.haskell.org/package/xmonad-0.18.0/changelog