$ git clone -n https://src.fedoraproject.org/rpms/python-niaarm.git /var/lib/mock/f42-build-side-1-3588912-46951/root/chroot_tmpdir/scmroot/python-niaarm
Cloning into '/var/lib/mock/f42-build-side-1-3588912-46951/root/chroot_tmpdir/scmroot/python-niaarm'...
$ git fetch origin 0382935deb4bf8c2103c9b57e09f4792143bf85d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-niaarm
 * [new ref]         0382935deb4bf8c2103c9b57e09f4792143bf85d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0382935 Update to 0.4.1