z40=0000000000000000000000000000000000000000
while read local_ref local_sha remote_ref remote_sha
do
    if [ "$local_sha" != $z40 ]; then
        if [ "$remote_sha" = $z40 ];
        then
            args="run --all-files"
        else
            args="run --origin $local_sha --source $remote_sha"
        fi
    fi
done

if [ "$args" != "" ]; then
    args="$args --hook-stage push"
else
    # If args is empty, then an attempt to push on an empty
    # changeset is being made. In this case, just exit cleanly
    exit 0
fi