#!/bin/sh

ROLE="undefined"
MPI_MASTER_SERVICE_NAME="sec_master"
MPI_WORKER_SERVICE_NAME="sec_worker"
HOSTNAMES="/etc/nethosts"

#######################
# ARGUMENTS PARSER

while [ "$1" != "" ];
do
    PARAM=$(echo "$1" | awk -F= '{print $1}')
    VALUE=$(echo "$1" | awk -F= '{print $2}')

    case $PARAM in
        role)
            [ "$VALUE" ] && ROLE=$VALUE
            ;;

        sec_master_service_name)
            [ "$VALUE" ] && MPI_MASTER_SERVICE_NAME=$VALUE
            ;;

        sec_worker_service_name)
            [ "$VALUE" ] && MPI_WORKER_SERVICE_NAME=$VALUE
            ;;
        *)
            echo "ERROR: unknown parameter \"$PARAM\""
            exit 1
            ;;
    esac
    shift
done



cat > /etc/opt/service_names <<- EOF
MPI_MASTER_SERVICE_NAME=${MPI_MASTER_SERVICE_NAME}
MPI_WORKER_SERVICE_NAME=${MPI_WORKER_SERVICE_NAME}
EOF

case $ROLE in
    "master")

        # Auto update default host file in background and dumb all output
        auto_update_hosts "${HOSTNAMES}" > /dev/null 2>&1 &

        # Start ssh server
        /usr/sbin/sshd -D
        ;;


    "worker")

        # Start ssh server in background
        /usr/sbin/sshd -D &

        # Keep trying to connect to master node and stay there indefinitely so that master node can see
        # the connected hosts that are ready for MPI work
        while sleep 1
        do
            # shellcheck disable=SC2086
            ssh -T -o "StrictHostKeyChecking no"   \
                -i "${USER_HOME}/.ssh/id_rsa"      \
                ${USER}@${MPI_MASTER_SERVICE_NAME} \
                "tail -f /dev/null"
        done
        ;;
    *)
        echo 'role argument only accepts "master" or "worker"'
esac