$ git clone -n https://src.fedoraproject.org/rpms/python-immutables.git /var/lib/mock/f40-build-2213759-52348/root/chroot_tmpdir/scmroot/python-immutables
Cloning into '/var/lib/mock/f40-build-2213759-52348/root/chroot_tmpdir/scmroot/python-immutables'...
$ git fetch origin bcdd613e6ea1a8b9828a7a2e887f375423f1008a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-immutables
 * [new ref]         bcdd613e6ea1a8b9828a7a2e887f375423f1008a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bcdd613 Update to version 0.20 rhbz#2232104