$ git clone -n https://src.fedoraproject.org/rpms/python-chameleon.git /var/lib/mock/f39-build-1443714-32586/root/chroot_tmpdir/scmroot/python-chameleon
Cloning into '/var/lib/mock/f39-build-1443714-32586/root/chroot_tmpdir/scmroot/python-chameleon'...
$ git fetch origin bdf092f01a22e7055671229fa8eca77484df2f4a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-chameleon
 * [new ref]         bdf092f01a22e7055671229fa8eca77484df2f4a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bdf092f Update to upstream.