#!/bin/bash
#
# lib/kuryr
# Utilities for kuryr-kubernetes devstack
# bind_for_kubelet
#   Description: Creates an OVS internal port so that baremetal kubelet will be
#                able to make both liveness and readiness http/tcp probes.
#   Params:
#      project - Id or name of the project used for kuryr devstack

# Dependencies:
# (none)

function ovs_bind_for_kubelet() {
    local port_id
    local port_mac
    local port_ips
    local port_subnets
    local prefix
    local project_id
    local security_group
    local ifname
    local service_subnet_cidr
    local pod_subnet_gw

    project_id="$1"
    security_group=$(openstack security group list \
        --project "$project_id" -f value | \
        awk '/default/ {print $1}')
    port_id=$(openstack port create \
        --device-owner compute:kuryr \
        --project "$project_id" \
        --security-group "$security_group" \
        --host "${HOSTNAME}" \
        --network "${KURYR_NEUTRON_DEFAULT_POD_NET}" \
        -f value -c id \
        kubelet-"${HOSTNAME}")
    ifname="kubelet${port_id}"
    ifname="${ifname:0:14}"
    service_subnet_cidr=$(openstack --os-cloud devstack-admin \
                         --os-region "$REGION_NAME" \
                         subnet show "$KURYR_NEUTRON_DEFAULT_SERVICE_SUBNET" \
                         -c cidr -f value)
    pod_subnet_gw=$(openstack subnet show "$KURYR_NEUTRON_DEFAULT_POD_SUBNET" \
                    -c gateway_ip -f value)

    port_mac=$(openstack port show "$port_id" -c mac_address -f value)
    port_ips=($(openstack port show "$port_id" -f value -c fixed_ips | \
        awk -F"'" '{print $2}'))
    port_subnets=($(openstack port show "$port_id" -f value -c fixed_ips | \
        awk -F"'" '{print $4}'))

    sudo ovs-vsctl -- --may-exist add-port $OVS_BRIDGE "$ifname" \
        -- set Interface "$ifname" type=internal \
        -- set Interface "$ifname" external-ids:iface-status=active \
        -- set Interface "$ifname" external-ids:attached-mac="$port_mac" \
        -- set Interface "$ifname" external-ids:iface-id="$port_id"

    sudo ip link set dev "$ifname" address "$port_mac"
    sudo ip link set dev "$ifname" up
    for ((i=0; i < ${#port_ips[@]}; i++)); do
        prefix=$(openstack subnet show "${port_subnets[$i]}" \
            -c cidr -f value | \
            cut -f2 -d/)
        sudo ip addr add "${port_ips[$i]}/${prefix}" dev "$ifname"
    done
    sudo ip route add "$service_subnet_cidr" via "$pod_subnet_gw" dev "$ifname"
    # Ignore the error if openstack-INPUT chain doesn't exist.
    sudo iptables -I openstack-INPUT 1 -p tcp -s 0.0.0.0/0 -d 0.0.0.0/0 --dport 6443 -j ACCEPT || true
}

# get_container
#   Description: Pulls a container from Dockerhub
#   Params:
#      image_name - the name of the image in docker hub
#      version    - The version of the image to pull. Defaults to 'latest'
function get_container {
    local image
    local image_name
    local version
    image_name="$1"
    version="${2:-latest}"

    if [ "$image_name" == "" ]; then
        return 0
    fi

    image="${image_name}:${version}"
    if [ -z "$(docker images -q "$image")" ]; then
        docker pull "$image"
    fi
}

# run_container
#   Description: Runs a container and attaches devstack's logging to it
#   Params:
#      name - Name of the container to run
#      args - arguments to run the container with
function run_container {
    # Runs a detached container and uses devstack's run process to monitor
    # its logs
    local name
    local docker_bin

    docker_bin=$(which docker)
    name="$1"
    shift
    args="$@"
    $docker_bin create --name $name $args

    run_process "$name" \
        "$docker_bin start --attach $name"
}

# stop_container
#   Description: stops a container and its devstack logging
#   Params:
#      name - Name of the container to stop
function stop_container {
    local name
    name="$1"

    docker kill "$name"
    docker rm "$name"
    stop_process "$name"
}


# prepare_etcd_legacy
#   Description: Creates datadir for etcd and fetches its container image
function prepare_etcd_legacy {
    # Make Etcd data directory
    sudo install -d -o "$STACK_USER" "$KURYR_ETCD_DATA_DIR"

    # Get Etcd container
    get_container "$KURYR_ETCD_IMAGE" "$KURYR_ETCD_VERSION"
}

# run_etcd_legacy
#   Description: Deprecated way of running etcd for Kubernetes (based on
#                coreos upstream image.
function run_etcd_legacy {
    run_container etcd \
        --net host \
        --volume="${KURYR_ETCD_DATA_DIR}:/var/etcd:rw" \
        "${KURYR_ETCD_IMAGE}:${KURYR_ETCD_VERSION}" \
            /usr/local/bin/etcd \
            --name devstack \
            --data-dir /var/etcd/data \
            --initial-advertise-peer-urls "$KURYR_ETCD_ADVERTISE_PEER_URL" \
            --listen-peer-urls "$KURYR_ETCD_LISTEN_PEER_URL" \
            --listen-client-urls "$KURYR_ETCD_LISTEN_CLIENT_URL" \
            --advertise-client-urls "$KURYR_ETCD_ADVERTISE_CLIENT_URL" \
            --initial-cluster-token etcd-cluster-1 \
            --initial-cluster "devstack=$KURYR_ETCD_ADVERTISE_PEER_URL" \
            --initial-cluster-state new
}

# _allocation_range
#   Description: Writes out tab separated usable ip range for a CIDR
#   Params:
#       cidr - The cidr to get the range for
#       gateway_position - Whether to reserve at 'beginning' or at 'end'
function _allocation_range {
  python - <<EOF "$@"
import sys

from ipaddress import ip_network
import six


n = ip_network(six.text_type(sys.argv[1]))
gateway_position = sys.argv[2]

if gateway_position == 'beginning':
    beg_offset = 2
    end_offset = 2
elif gateway_position == 'end':
    beg_offset = 1
    end_offset = 3
else:
    raise ValueError('Disallowed gateway position %s' % gateway_position)

print("%s\\t%s" % (n[beg_offset], n[-end_offset]))
EOF
}

# create_k8s_icmp_sg_rules
#   Description: Creates icmp sg rules for Kuryr-Kubernetes pods
#   Params:
#      sg_id       - Kuryr's security group id
#      direction   - egress or ingress direction
function create_k8s_icmp_sg_rules {
    local sg_id=$1
    local direction="$2"
    icmp_sg_rules=$(openstack --os-cloud devstack-admin \
                              --os-region "$REGION_NAME" \
                              security group rule create \
                              --protocol icmp \
                              --"$direction" "$sg_id")
    die_if_not_set $LINENO icmp_sg_rules \
        "Failure creating icmp sg ${direction} rule for ${sg_id}"
}

# create_k8s_subnet
#   Description: Creates a network and subnet for Kuryr-Kubernetes usage
#   Params:
#      project_id    - Kuryr's project uuid
#      net_name      - Name of the network to create
#      subnet_name   - Name of the subnet to create
#      subnetpool_id - uuid of the subnet pool to use
#      router        - name of the router to plug the subnet to
function create_k8s_subnet {
    # REVISIT(apuimedo): add support for IPv6
    local project_id=$1
    local net_name="$2"
    local subnet_name="$3"
    local subnetpool_id="$4"
    local router="$5"
    local subnet_params="--project $project_id "
    local subnet_cidr

    subnet_params+="--ip-version 4 "
    subnet_params+="--no-dhcp --gateway none "
    subnet_params+="--subnet-pool $subnetpool_id "

    local net_id
    net_id=$(openstack --os-cloud devstack-admin \
                       --os-region "$REGION_NAME" \
                       network create --project "$project_id" \
                       "$net_name" \
                       -c id -f value)
    subnet_params+="--network $net_id $subnet_name"

    local subnet_id
    subnet_id=$(openstack --os-cloud devstack-admin \
                          --os-region "$REGION_NAME" \
                          subnet create $subnet_params \
                          -c id -f value)
    die_if_not_set $LINENO subnet_id \
        "Failure creating K8s ${subnet_name} IPv4 subnet for ${project_id}"

    subnet_cidr=$(openstack --os-cloud devstack-admin \
                             --os-region "$REGION_NAME" \
                             subnet show "$subnet_id" \
                             -c cidr -f value)
    die_if_not_set $LINENO subnet_cidr \
        "Failure getting K8s ${subnet_name} IPv4 subnet for $project_id"

    # Since K8s has its own IPAM for services and allocates the first IP from
    # service subnet CIDR to Kubernetes apiserver, we'll always put the router
    # interface at the end of the range.
    local router_ip
    local allocation_start
    local allocation_end
    router_ip=$(_cidr_range "$subnet_cidr" | cut -f2)
    allocation_start=$(_allocation_range "$subnet_cidr" end | cut -f1)
    allocation_end=$(_allocation_range "$subnet_cidr" end | cut -f2)
    die_if_not_set $LINENO router_ip \
        "Failed to determine K8s ${subnet_name} subnet router IP"
    openstack --os-cloud devstack-admin \
        --os-region "$REGION_NAME" subnet set \
        --gateway "$router_ip" --no-allocation-pool "$subnet_id" \
        || die $LINENO "Failed to update K8s ${subnet_name} subnet"
    # Set a new allocation pool for the subnet so ports can be created again
    openstack --os-cloud devstack-admin \
        --os-region "$REGION_NAME" subnet set \
        --allocation-pool "start=${allocation_start},end=${allocation_end}" \
        "$subnet_id" || die $LINENO "Failed to update K8s ${subnet_name} subnet"
    openstack --os-cloud devstack-admin \
              --os-region "$REGION_NAME" \
              router add subnet "$router" "$subnet_id" \
              || die $LINENO \
              "Failed to enable routing for K8s ${subnet_name} subnet"
}

# create_k8s_router_fake_service
#   Description: Creates an endpoint-less kubernetes service to keep Kubernetes
#                API server from allocating the service subnet router IP for
#                another service
function create_k8s_router_fake_service {
    local router_ip
    local existing_svc_ip
    local fake_svc_name

    fake_svc_name='kuryr-svc-router'
    router_ip=$(openstack --os-cloud devstack-admin \
        --os-region "$REGION_NAME" \
        subnet show "$KURYR_NEUTRON_DEFAULT_SERVICE_SUBNET" \
        -f value -c gateway_ip)
    existing_svc_ip=$(/usr/local/bin/kubectl get svc --namespace kube-system -o jsonpath='{.items[?(@.metadata.name=='"\"${fake_svc_name}\""')].spec.clusterIP}')

    if [[ "$existing_svc_ip" == "" ]]; then
        # Create fake router service so the router clusterIP can't be reassigned
        cat <<EOF | /usr/local/bin/kubectl create -f -
kind: Service
apiVersion: v1
metadata:
  name: "${fake_svc_name}"
  namespace: kube-system
spec:
  type: ClusterIP
  clusterIP: "${router_ip}"
  ports:
    - protocol: TCP
      port: 80
EOF
    fi
}

# build_kuryr_containers
#   Description: Generates a Kuryr controller and Kuryr CNI docker images in
#       the local docker registry as kuryr/controller:latest and
#       kuryr/cni:latest respectively
function build_kuryr_containers() {
    local cni_bin_dir
    local cni_conf_dir
    local cni_daemon
    local build_dir

    cni_bin_dir=$1
    cni_conf_dir=$2
    cni_daemon=$3
    build_dir="${DEST}/kuryr-kubernetes"
    pushd "$build_dir"

    # Build controller image
    sudo docker build -t kuryr/controller -f "controller.Dockerfile" .

    # Build CNI image
    sudo ./tools/build_cni_daemonset_image $cni_bin_dir $cni_conf_dir $cni_daemon
    popd
}

function indent() {
    sed 's/^/    /';
}

function generate_kuryr_configmap() {
    local output_dir
    local controller_conf_path
    local cni_conf_path
    output_dir=$1
    controller_conf_path=${2:-""}
    cni_conf_path=${3:-$controller_conf_path}

    mkdir -p "$output_dir"
    rm -f ${output_dir}/config_map.yml
    # kuryr-contoller config
    cat >> "${output_dir}/config_map.yml" << EOF
apiVersion: v1
kind: ConfigMap
metadata:
  name: kuryr-config
  namespace: kube-system
data:
  kuryr.conf: |
EOF

    cat $controller_conf_path | indent >> "${output_dir}/config_map.yml"

    # kuryr-cni config (different token_file location)
    # token_file = /etc/kuryr/token
    # ssl_ca_crt_file = /etc/kuryr/ca.crt
    # ssl_verify_server_crt = true
    cat >> "${output_dir}/config_map.yml" << EOF
  kuryr-cni.conf: |
EOF

    cat $cni_conf_path | indent >> "${output_dir}/config_map.yml"
}

function generate_kuryr_certificates_secret() {
    local output_dir
    local certs_bundle_path
    output_dir=$1
    certs_bundle_path=${2:-""}

    mkdir -p "$output_dir"
    rm -f ${output_dir}/certificates_secret.yml

    if [ -n $certs_bundle_path ]; then
        CA_CERT=`cat $certs_bundle_path | base64 -w0`
    fi

    cat >> "${output_dir}/certificates_secret.yml" << EOF
apiVersion: v1
kind: Secret
metadata:
  name: kuryr-certificates
  namespace: kube-system
type: Opaque
data:
  kuryr-ca-bundle.crt: $CA_CERT
EOF
}

function generate_kuryr_service_account() {
    output_dir=$1
    mkdir -p "$output_dir"
    rm -f ${output_dir}/service_account.yml
    cat >> "${output_dir}/service_account.yml" << EOF
---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: kuryr-controller
  namespace: kube-system
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: kuryr-controller
rules:
- apiGroups:
  - ""
  verbs: ["*"]
  resources:
    - deployments
    - endpoints
    - ingress
    - pods
    - policies
    - nodes
    - services
    - services/status
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: kuryr-controller-global
subjects:
- kind: ServiceAccount
  name: kuryr-controller
  namespace: kube-system
roleRef:
  kind: ClusterRole
  name: kuryr-controller
  apiGroup: rbac.authorization.k8s.io
EOF
}

function generate_controller_deployment() {
    output_dir=$1
    health_server_port=$2
    mkdir -p "$output_dir"
    rm -f ${output_dir}/controller_deployment.yml
    cat >> "${output_dir}/controller_deployment.yml" << EOF
apiVersion: apps/v1beta1
kind: Deployment
metadata:
  labels:
    name: kuryr-controller
  name: kuryr-controller
  namespace: kube-system
spec:
  replicas: 1
  template:
    metadata:
      labels:
        name: kuryr-controller
      name: kuryr-controller
    spec:
      serviceAccountName: kuryr-controller
      automountServiceAccountToken: true
      hostNetwork: true
      containers:
      - image: kuryr/controller:latest
        imagePullPolicy: Never
        name: controller
        terminationMessagePath: "/dev/termination-log"
        volumeMounts:
        - name: config-volume
          mountPath: "/etc/kuryr/kuryr.conf"
          subPath: kuryr.conf
        - name: certificates-volume
          mountPath: "/etc/ssl/certs"
          readOnly: true
        readinessProbe:
          httpGet:
            path: /ready
            port: ${health_server_port}
            scheme: HTTP
          timeoutSeconds: 5
        livenessProbe:
          httpGet:
            path: /alive
            port: ${health_server_port}
          initialDelaySeconds: 15
EOF

    cat >> "${output_dir}/controller_deployment.yml" << EOF
      volumes:
      - name: config-volume
        configMap:
          name: kuryr-config
      - name: certificates-volume
        secret:
          secretName: kuryr-certificates
      restartPolicy: Always
EOF
}

function generate_cni_daemon_set() {
    output_dir=$1
    cni_health_server_port=$2
    cni_daemon=${3:-False}
    cni_bin_dir=${4:-/opt/cni/bin}
    cni_conf_dir=${5:-/etc/cni/net.d}
    mkdir -p "$output_dir"
    rm -f ${output_dir}/cni_ds.yml
    cat >> "${output_dir}/cni_ds.yml" << EOF
apiVersion: extensions/v1beta1
kind: DaemonSet
metadata:
  name: kuryr-cni-ds
  namespace: kube-system
  labels:
    tier: node
    app: kuryr
spec:
  template:
    metadata:
      labels:
        tier: node
        app: kuryr
    spec:
      hostNetwork: true
      tolerations:
      - key: node-role.kubernetes.io/master
        operator: Exists
        effect: NoSchedule
      serviceAccountName: kuryr-controller
      containers:
      - name: kuryr-cni
        image: kuryr/cni:latest
        imagePullPolicy: Never
        command: [ "cni_ds_init" ]
        env:
        - name: KUBERNETES_NODE_NAME
          valueFrom:
            fieldRef:
              fieldPath: spec.nodeName
        - name: KURYR_CNI_POD_NAME
          valueFrom:
            fieldRef:
              fieldPath: metadata.name
        securityContext:
          privileged: true
        volumeMounts:
        - name: bin
          mountPath: /opt/cni/bin
        - name: net-conf
          mountPath: /etc/cni/net.d
        - name: config-volume
          mountPath: /etc/kuryr/kuryr.conf
          subPath: kuryr-cni.conf
        - name: proc
          mountPath: /host_proc
        - name: openvswitch
          mountPath: /var/run/openvswitch
EOF
    if [ "$cni_daemon" == "True" ]; then
        cat >> "${output_dir}/cni_ds.yml" << EOF
        readinessProbe:
          httpGet:
            path: /ready
            port: ${cni_health_server_port}
            scheme: HTTP
          initialDelaySeconds: 60
          timeoutSeconds: 10
        livenessProbe:
          httpGet:
            path: /alive
            port: ${cni_health_server_port}
          initialDelaySeconds: 60
EOF
    fi
    cat >> "${output_dir}/cni_ds.yml" << EOF
      volumes:
        - name: bin
          hostPath:
            path: ${cni_bin_dir}
        - name: net-conf
          hostPath:
            path: ${cni_conf_dir}
        - name: config-volume
          configMap:
            name: kuryr-config
        - name: proc
          hostPath:
            path: /proc
        - name: openvswitch
          hostPath:
            path: ${OVS_HOST_PATH}
EOF
}

# install_openshift_binary
#   Description: Fetches the configured binary release of OpenShift and
#                installs it in the system
function install_openshift_binary {
    mkdir -p "$OPENSHIFT_HOME"
    curl -L "$OPENSHIFT_BINARY_URL" -o "${OPENSHIFT_HOME}/openshift.tar.gz" --retry 2
    tar xzvf "${OPENSHIFT_HOME}/openshift.tar.gz" --strip 1 -C "$OPENSHIFT_HOME"

    # Make openshift run from its untarred directory
    cat << EOF | sudo tee /usr/local/bin/openshift
#!/bin/bash
cd ${OPENSHIFT_HOME}
exec ./openshift "\$@"
EOF
    sudo chmod a+x /usr/local/bin/openshift

    # Make oc easily available
    cat << EOF | sudo tee /usr/local/bin/oc
#!/bin/bash
CURL_CA_BUNDLE=${OPENSHIFT_DATA_DIR}/ca.crt \
    KUBECONFIG=${OPENSHIFT_DATA_DIR}/admin.kubeconfig \
    ${OPENSHIFT_HOME}/oc "\$@"
EOF
    sudo chmod a+x /usr/local/bin/oc

    # Make kubectl easily available
    cat << EOF | sudo tee /usr/local/bin/kubectl
#!/bin/bash
CURL_CA_BUNDLE=${OPENSHIFT_DATA_DIR}/ca.crt \
    KUBECONFIG=${OPENSHIFT_DATA_DIR}/admin.kubeconfig \
    ${OPENSHIFT_HOME}/kubectl "\$@"
EOF
    sudo chmod a+x /usr/local/bin/kubectl

    # Make oadm easily available
    cat << EOF | sudo tee /usr/local/bin/oadm
#!/bin/bash
CURL_CA_BUNDLE=${OPENSHIFT_DATA_DIR}/ca.crt \
    KUBECONFIG=${OPENSHIFT_DATA_DIR}/admin.kubeconfig \
    ${OPENSHIFT_HOME}/oadm "\$@"
EOF
    sudo chmod a+x /usr/local/bin/oadm
}

# run_openshift_master
#   Description: Starts the openshift master
function run_openshift_master {
    local cmd
    local pod_subnet_cidr
    local service_subnet_cidr

    sudo install -d -o "$STACK_USER" "$OPENSHIFT_DATA_DIR"

    pod_subnet_cidr=$(openstack --os-cloud devstack-admin \
                         --os-region "$REGION_NAME" \
                         subnet show "$KURYR_NEUTRON_DEFAULT_POD_SUBNET" \
                         -c cidr -f value)
    service_subnet_cidr=$(openstack --os-cloud devstack-admin \
                         --os-region "$REGION_NAME" \
                         subnet show "$KURYR_NEUTRON_DEFAULT_SERVICE_SUBNET" \
                         -c cidr -f value)

    # Generate master config
    "${OPENSHIFT_HOME}/openshift" start master \
        "--etcd=${KURYR_ETCD_ADVERTISE_CLIENT_URL}" \
        "--network-cidr=${pod_subnet_cidr}" \
        "--portal-net=${service_subnet_cidr}" \
        "--listen=${OPENSHIFT_API_URL}" \
        "--master=${OPENSHIFT_API_URL}" \
        "--write-config=${OPENSHIFT_DATA_DIR}"

    # Reconfigure Kuryr-Kubernetes to use the certs generated
    iniset "$KURYR_CONFIG" kubernetes api_root "$OPENSHIFT_API_URL"
    iniset "$KURYR_CONFIG" kubernetes ssl_client_crt_file "${OPENSHIFT_DATA_DIR}/admin.crt"
    iniset "$KURYR_CONFIG" kubernetes ssl_client_key_file "${OPENSHIFT_DATA_DIR}/admin.key"
    iniset "$KURYR_CONFIG" kubernetes ssl_ca_crt_file "${OPENSHIFT_DATA_DIR}/ca.crt"

    sudo chown "${STACK_USER}:${STACK_USER}" -R "$OPENSHIFT_DATA_DIR"

    # Generate kubelet kubeconfig
    "${OPENSHIFT_HOME}/oadm" create-kubeconfig \
        "--client-key=${OPENSHIFT_DATA_DIR}/master.kubelet-client.key" \
        "--client-certificate=${OPENSHIFT_DATA_DIR}/master.kubelet-client.crt" \
        "--certificate-authority=${OPENSHIFT_DATA_DIR}/ca.crt" \
        "--master=${OPENSHIFT_API_URL}" \
        "--kubeconfig=${OPENSHIFT_DATA_DIR}/master.kubelet-client.kubeconfig"

    cmd="/usr/local/bin/openshift start master \
        --config=${OPENSHIFT_DATA_DIR}/master-config.yaml"

    wait_for "etcd" "${KURYR_ETCD_ADVERTISE_CLIENT_URL}/v2/machines"

    if [[ "$USE_SYSTEMD" = "True" ]]; then
        # If systemd is being used, proceed as normal
        run_process openshift-master "$cmd" root root
    else
        # If screen is being used, there is a possibility that the devstack
        # environment is on a stable branch. Older versions of run_process have
        # a different signature. Sudo is used as a workaround that works in
        # both older and newer versions of devstack.
        run_process openshift-master "sudo $cmd"
    fi
}

# make_admin_cluster_admin
#   Description: Gives the system:admin permissions over the cluster
function make_admin_cluster_admin {
    wait_for "OpenShift API Server" "$OPENSHIFT_API_URL" \
        "${OPENSHIFT_DATA_DIR}/ca.crt"
    /usr/local/bin/oadm policy add-cluster-role-to-user cluster-admin admin \
        "--config=${OPENSHIFT_DATA_DIR}/openshift-master.kubeconfig"
}

# run_openshift_node
#   Description: Starts the openshift node
function run_openshift_node {
    local command

    #install required CNI loopback driver
    curl -L "$OPENSHIFT_CNI_BINARY_URL" | sudo tar -C "$CNI_BIN_DIR" -xzvf - ./loopback
    command="/usr/local/bin/openshift start node \
        --kubeconfig=${OPENSHIFT_DATA_DIR}/master.kubelet-client.kubeconfig \
        --enable=kubelet,plugins \
        --network-plugin=cni \
        --listen=https://0.0.0.0:8442"

    # Link master config necessary for bootstrapping
    # TODO: This needs to be generated so we don't depend on it on multinode
    mkdir -p "${OPENSHIFT_HOME}/openshift.local.config"
    ln -fs "${OPENSHIFT_DATA_DIR}" "${OPENSHIFT_HOME}/openshift.local.config/master"

    # Link stack CNI to location expected by openshift node
    sudo mkdir -p /etc/cni
    sudo rm -fr /etc/cni/net.d
    sudo rm -fr /opt/cni/bin
    sudo ln -fs "${CNI_CONF_DIR}" /etc/cni/net.d
    sudo mkdir -p /opt/cni
    sudo ln -fs "${CNI_BIN_DIR}" /opt/cni/bin


    if [[ "$USE_SYSTEMD" = "True" ]]; then
        # If systemd is being used, proceed as normal
        run_process openshift-node "$command" root root
    else
        # If screen is being used, there is a possibility that the devstack
        # environment is on a stable branch. Older versions of run_process have
        # a different signature. Sudo is used as a workaround that works in
        # both older and newer versions of devstack.
        run_process openshift-node "sudo $command"
    fi
}