$ git clone -n https://src.fedoraproject.org/rpms/python-mock.git /var/lib/mock/f40-build-2222798-52712/root/chroot_tmpdir/scmroot/python-mock
Cloning into '/var/lib/mock/f40-build-2222798-52712/root/chroot_tmpdir/scmroot/python-mock'...
$ git fetch origin cb63f08291392436fc49528ad8c92b13ecb10ea8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-mock
 * [new ref]         cb63f08291392436fc49528ad8c92b13ecb10ea8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cb63f08 Fix typo in an old changelog entry