$ git clone -n https://src.fedoraproject.org/rpms/python-ast-monitor.git /var/lib/mock/f42-build-3214237-41021/root/chroot_tmpdir/scmroot/python-ast-monitor
Cloning into '/var/lib/mock/f42-build-3214237-41021/root/chroot_tmpdir/scmroot/python-ast-monitor'...
$ git fetch origin b46dee56a1755c4530cd9b6ae0722aa151b94e0c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-ast-monitor
 * [new ref]         b46dee56a1755c4530cd9b6ae0722aa151b94e0c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b46dee5 Add Packit config