$ git clone -n https://src.fedoraproject.org/rpms/python-xcffib.git /var/lib/mock/f39-build-1426665-31606/root/chroot_tmpdir/scmroot/python-xcffib
Cloning into '/var/lib/mock/f39-build-1426665-31606/root/chroot_tmpdir/scmroot/python-xcffib'...
$ git fetch origin 5b3b53d71fe6ba1c08ce586abbbe9f218fca3767:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-xcffib
 * [new ref]         5b3b53d71fe6ba1c08ce586abbbe9f218fca3767 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5b3b53d Upload source