#!/bin/bash
#
#   Licensed under the Apache License, Version 2.0 (the "License");
#   you may not use this file except in compliance with the License.
#   You may obtain a copy of the License at
#
#       http://www.apache.org/licenses/LICENSE-2.0
#
#   Unless required by applicable law or agreed to in writing, software
#   distributed under the License is distributed on an "AS IS" BASIS,
#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#   See the License for the specific language governing permissions and
#   limitations under the License.
#

function usage(){
    [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
    echo -e "usage: $0 [OPTIONS]"
    echo -e "Install OSM from binaries or source code (by default, from binaries)"
    echo -e "  OPTIONS"
    echo -e "     -h / --help:    print this help"
    echo -e "     -y:             do not prompt for confirmation, assumes yes"
    echo -e "     -r <repo>:      use specified repository name for osm packages"
    echo -e "     -R <release>:   use specified release for osm binaries (deb packages, lxd images, ...)"
    echo -e "     -u <repo base>: use specified repository url for osm packages"
    echo -e "     -k <repo key>:  use specified repository public key url"
    echo -e "     -b <refspec>:   install OSM from source code using a specific branch (master, v2.0, ...) or tag"
    echo -e "                     -b master          (main dev branch)"
    echo -e "                     -b v2.0            (v2.0 branch)"
    echo -e "                     -b tags/v1.1.0     (a specific tag)"
    echo -e "                     ..."
    echo -e "     -a <apt proxy url>: use this apt proxy url when downloading apt packages (air-gapped installation)"
    echo -e "     -s <stack name> or <namespace>  user defined stack name when installed using swarm or namespace when installed using k8s, default is osm"
    echo -e "     -H <VCA host>   use specific juju host controller IP"
    echo -e "     -S <VCA secret> use VCA/juju secret key"
    echo -e "     -P <VCA pubkey> use VCA/juju public key file"
    echo -e "     -C <VCA cacert> use VCA/juju CA certificate file"
    echo -e "     -A <VCA apiproxy> use VCA/juju API proxy"
    echo -e "     --pla:          install the PLA module for placement support"
    echo -e "     -m <MODULE>:    install OSM but only rebuild or pull the specified docker images (NG-UI, NBI, LCM, RO, MON, POL, PLA, KAFKA, MONGO, PROMETHEUS, PROMETHEUS-CADVISOR, KEYSTONE-DB, NONE)"
    echo -e "     -o <ADDON>:     ONLY (un)installs one of the addons (k8s_monitor)"
    echo -e "     -O <openrc file path/cloud name>: Install OSM to an OpenStack infrastructure. <openrc file/cloud name> is required. If a <cloud name> is used, the clouds.yaml file should be under ~/.config/openstack/ or /etc/openstack/"
    echo -e "     -N <openstack public network name/ID>: Public network name required to setup OSM to OpenStack"
    echo -e "     -f <path to SSH public key>: Public SSH key to use to deploy OSM to OpenStack"
    echo -e "     -F <path to cloud-init file>: Cloud-Init userdata file to deploy OSM to OpenStack"
    echo -e "     -D <devops path> use local devops installation path"
    echo -e "     -w <work dir>   Location to store runtime installation"
    echo -e "     -t <docker tag> specify osm docker tag (default is latest)"
    echo -e "     -l:             LXD cloud yaml file"
    echo -e "     -L:             LXD credentials yaml file"
    echo -e "     -K:             Specifies the name of the controller to use - The controller must be already bootstrapped"
    echo -e "     -d <docker registry URL> use docker registry URL instead of dockerhub"
    echo -e "     -p <docker proxy URL> set docker proxy URL as part of docker CE configuration"
    echo -e "     -T <docker tag> specify docker tag for the modules specified with option -m"
    echo -e "     --debug:        debug mode"
    echo -e "     --nocachelxdimages:  do not cache local lxd images, do not create cronjob for that cache (will save installation time, might affect instantiation time)"
    echo -e "     --cachelxdimages:  cache local lxd images, create cronjob for that cache (will make installation longer)"
    echo -e "     --nolxd:        do not install and configure LXD, allowing unattended installations (assumes LXD is already installed and confifured)"
    echo -e "     --nodocker:     do not install docker, do not initialize a swarm (assumes docker is already installed and a swarm has been initialized)"
    echo -e "     --nojuju:       do not juju, assumes already installed"
    echo -e "     --nodockerbuild:do not build docker images (use existing locally cached images)"
    echo -e "     --nohostports:  do not expose docker ports to host (useful for creating multiple instances of osm on the same host)"
    echo -e "     --nohostclient: do not install the osmclient"
    echo -e "     --uninstall:    uninstall OSM: remove the containers and delete NAT rules"
    echo -e "     --source:       install OSM from source code using the latest stable tag"
    echo -e "     --develop:      (deprecated, use '-b master') install OSM from source code using the master branch"
    echo -e "     --pullimages:   pull/run osm images from docker.io/opensourcemano"
    echo -e "     --k8s_monitor:  install the OSM kubernetes monitoring with prometheus and grafana"
    echo -e "     --volume:       create a VM volume when installing to OpenStack"
    echo -e "     --showopts:     print chosen options and exit (only for debugging)"
    echo -e "     --charmed:                   Deploy and operate OSM with Charms on k8s"
    echo -e "     [--bundle <bundle path>]:    Specify with which bundle to deploy OSM with charms (--charmed option)"
    echo -e "     [--k8s <kubeconfig path>]:   Specify with which kubernetes to deploy OSM with charms (--charmed option)"
    echo -e "     [--vca <name>]:              Specifies the name of the controller to use - The controller must be already bootstrapped (--charmed option)"
    echo -e "     [--small-profile]:           Do not install and configure LXD which aims to use only K8s Clouds (--charmed option)"
    echo -e "     [--lxd <yaml path>]:         Takes a YAML file as a parameter with the LXD Cloud information (--charmed option)"
    echo -e "     [--lxd-cred <yaml path>]:    Takes a YAML file as a parameter with the LXD Credentials information (--charmed option)"
    echo -e "     [--microstack]:              Installs microstack as a vim. (--charmed option)"
    echo -e "     [--overlay]:                 Add an overlay to override some defaults of the default bundle (--charmed option)"
    echo -e "     [--ha]:                      Installs High Availability bundle. (--charmed option)"
    echo -e "     [--tag]:                     Docker image tag. (--charmed option)"
    echo -e "     [--registry]:                Docker registry with optional credentials as user:pass@hostname:port (--charmed option)"
    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
}

# takes a juju/accounts.yaml file and returns the password specific
# for a controller. I wrote this using only bash tools to minimize
# additions of other packages
function parse_juju_password {
    [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
    password_file="${HOME}/.local/share/juju/accounts.yaml"
    local controller_name=$1
    local s='[[:space:]]*' w='[a-zA-Z0-9_-]*' fs=$(echo @|tr @ '\034')
    sed -ne "s|^\($s\):|\1|" \
         -e "s|^\($s\)\($w\)$s:$s[\"']\(.*\)[\"']$s\$|\1$fs\2$fs\3|p" \
         -e "s|^\($s\)\($w\)$s:$s\(.*\)$s\$|\1$fs\2$fs\3|p" $password_file |
    awk -F$fs -v controller=$controller_name '{
        indent = length($1)/2;
        vname[indent] = $2;
        for (i in vname) {if (i > indent) {delete vname[i]}}
        if (length($3) > 0) {
            vn=""; for (i=0; i<indent; i++) {vn=(vn)(vname[i])("_")}
            if (match(vn,controller) && match($2,"password")) {
                printf("%s",$3);
            }
        }
    }'
    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
}

function set_vca_variables() {
    OSM_VCA_CLOUDNAME="lxd-cloud"
    [ -n "$OSM_VCA_HOST" ] && OSM_VCA_CLOUDNAME="localhost"
    if [ -z "$OSM_VCA_HOST" ]; then
        [ -z "$CONTROLLER_NAME" ] && OSM_VCA_HOST=`sg lxd -c "juju show-controller $OSM_STACK_NAME"|grep api-endpoints|awk -F\' '{print $2}'|awk -F\: '{print $1}'`
        [ -n "$CONTROLLER_NAME" ] && OSM_VCA_HOST=`juju show-controller $CONTROLLER_NAME |grep api-endpoints|awk -F\' '{print $2}'|awk -F\: '{print $1}'`
        [ -z "$OSM_VCA_HOST" ] && FATAL "Cannot obtain juju controller IP address"
    fi
    if [ -z "$OSM_VCA_SECRET" ]; then
        [ -z "$CONTROLLER_NAME" ] && OSM_VCA_SECRET=$(parse_juju_password $OSM_STACK_NAME)
        [ -n "$CONTROLLER_NAME" ] && OSM_VCA_SECRET=$(parse_juju_password $CONTROLLER_NAME)
        [ -z "$OSM_VCA_SECRET" ] && FATAL "Cannot obtain juju secret"
    fi
    if [ -z "$OSM_VCA_PUBKEY" ]; then
        OSM_VCA_PUBKEY=$(cat $HOME/.local/share/juju/ssh/juju_id_rsa.pub)
        [ -z "$OSM_VCA_PUBKEY" ] && FATAL "Cannot obtain juju public key"
    fi
    if [ -z "$OSM_VCA_CACERT" ]; then
        [ -z "$CONTROLLER_NAME" ] && OSM_VCA_CACERT=$(juju controllers --format json | jq -r --arg controller $OSM_STACK_NAME '.controllers[$controller]["ca-cert"]' | base64 | tr -d \\n)
        [ -n "$CONTROLLER_NAME" ] && OSM_VCA_CACERT=$(juju controllers --format json | jq -r --arg controller $CONTROLLER_NAME '.controllers[$controller]["ca-cert"]' | base64 | tr -d \\n)
        [ -z "$OSM_VCA_CACERT" ] && FATAL "Cannot obtain juju CA certificate"
    fi
}

function generate_secret() {
    [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
    head /dev/urandom | tr -dc A-Za-z0-9 | head -c 32
    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
}

function check_packages() {
    NEEDED_PACKAGES="$1"
    echo -e "Checking required packages: ${NEEDED_PACKAGES}"
    for PACKAGE in ${NEEDED_PACKAGES} ; do
        dpkg -L ${PACKAGE}
        if [ $? -ne 0 ]; then
            echo -e "Package ${PACKAGE} is not installed."
            echo -e "Updating apt-cache ..."
            sudo apt-get update
            echo -e "Installing ${PACKAGE} ..."
            sudo apt-get install -y ${PACKAGE} || FATAL "failed to install ${PACKAGE}"
        fi
    done
    echo -e "Required packages are present: ${NEEDED_PACKAGES}"
}

function install_lxd() {
    [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
    # Apply sysctl production values for optimal performance
    sudo cp ${OSM_DEVOPS}/installers/60-lxd-production.conf /etc/sysctl.d/60-lxd-production.conf
    sudo sysctl --system

    # Install LXD snap
    sudo apt-get remove --purge -y liblxc1 lxc-common lxcfs lxd lxd-client
    snap info lxd | grep installed > /dev/null
    if [ $? -eq 0 ]; then
        sudo snap refresh lxd --channel $LXD_VERSION/stable
    else
        sudo snap install lxd --channel $LXD_VERSION/stable
    fi

    # Configure LXD
    sudo usermod -a -G lxd `whoami`
    cat ${OSM_DEVOPS}/installers/lxd-preseed.conf | sed 's/^config: {}/config:\n  core.https_address: '$DEFAULT_IP':8443/' | sg lxd -c "lxd init --preseed"
    sg lxd -c "lxd waitready"
    DEFAULT_IF=$(ip route list|awk '$1=="default" {print $5; exit}')
    [ -z "$DEFAULT_IF" ] && DEFAULT_IF=$(route -n |awk '$1~/^0.0.0.0/ {print $8; exit}')
    [ -z "$DEFAULT_IF" ] && FATAL "Not possible to determine the interface with the default route 0.0.0.0"
    DEFAULT_MTU=$(ip addr show ${DEFAULT_IF} | perl -ne 'if (/mtu\s(\d+)/) {print $1;}')
    sg lxd -c "lxc profile device set default eth0 mtu $DEFAULT_MTU"
    sg lxd -c "lxc network set lxdbr0 bridge.mtu $DEFAULT_MTU"
    #sudo systemctl stop lxd-bridge
    #sudo systemctl --system daemon-reload
    #sudo systemctl enable lxd-bridge
    #sudo systemctl start lxd-bridge
    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
}

function ask_user(){
    # ask to the user and parse a response among 'y', 'yes', 'n' or 'no'. Case insensitive
    # Params: $1 text to ask;   $2 Action by default, can be 'y' for yes, 'n' for no, other or empty for not allowed
    # Return: true(0) if user type 'yes'; false (1) if user type 'no'
    [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
    read -e -p "$1" USER_CONFIRMATION
    while true ; do
        [ -z "$USER_CONFIRMATION" ] && [ "$2" == 'y' ] && return 0
        [ -z "$USER_CONFIRMATION" ] && [ "$2" == 'n' ] && return 1
        [ "${USER_CONFIRMATION,,}" == "yes" ] || [ "${USER_CONFIRMATION,,}" == "y" ] && return 0
        [ "${USER_CONFIRMATION,,}" == "no" ]  || [ "${USER_CONFIRMATION,,}" == "n" ] && return 1
        read -e -p "Please type 'yes' or 'no': " USER_CONFIRMATION
    done
    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
}

function install_osmclient(){
    [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
    CLIENT_RELEASE=${RELEASE#"-R "}
    CLIENT_REPOSITORY_KEY="OSM%20ETSI%20Release%20Key.gpg"
    CLIENT_REPOSITORY=${REPOSITORY#"-r "}
    CLIENT_REPOSITORY_BASE=${REPOSITORY_BASE#"-u "}
    key_location=$CLIENT_REPOSITORY_BASE/$CLIENT_RELEASE/$CLIENT_REPOSITORY_KEY
    curl $key_location | sudo APT_KEY_DONT_WARN_ON_DANGEROUS_USAGE=1 apt-key add -
    sudo add-apt-repository -y "deb [arch=amd64] $CLIENT_REPOSITORY_BASE/$CLIENT_RELEASE $CLIENT_REPOSITORY osmclient IM"
    sudo apt-get update
    sudo apt-get install -y python3-pip
    sudo -H LC_ALL=C python3 -m pip install -U pip
    sudo -H LC_ALL=C python3 -m pip install -U python-magic pyangbind verboselogs
    sudo apt-get install -y python3-osm-im python3-osmclient
    if [ -f /usr/lib/python3/dist-packages/osm_im/requirements.txt ]; then
        python3 -m pip install -r /usr/lib/python3/dist-packages/osm_im/requirements.txt
    fi
    if [ -f /usr/lib/python3/dist-packages/osmclient/requirements.txt ]; then
        sudo apt-get install -y libcurl4-openssl-dev libssl-dev libmagic1
        python3 -m pip install -r /usr/lib/python3/dist-packages/osmclient/requirements.txt
    fi
    [ -z "$INSTALL_LIGHTWEIGHT" ] && export OSM_HOSTNAME=`lxc list | awk '($2=="SO-ub"){print $6}'`
    [ -z "$INSTALL_LIGHTWEIGHT" ] && export OSM_RO_HOSTNAME=`lxc list | awk '($2=="RO"){print $6}'`
    echo -e "\nOSM client installed"
    if [ -z "$INSTALL_LIGHTWEIGHT" ]; then
        echo -e "You might be interested in adding the following OSM client env variables to your .bashrc file:"
        echo "     export OSM_HOSTNAME=${OSM_HOSTNAME}"
        echo "     export OSM_RO_HOSTNAME=${OSM_RO_HOSTNAME}"
    else
        echo -e "OSM client assumes that OSM host is running in localhost (127.0.0.1)."
        echo -e "In case you want to interact with a different OSM host, you will have to configure this env variable in your .bashrc file:"
        echo "     export OSM_HOSTNAME=<OSM_host>"
    fi
    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
    return 0
}

function docker_login() {
    [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
    echo "Docker login"
    [ -z "${DEBUG_INSTALL}" ] || DEBUG "Docker registry user: ${DOCKER_REGISTRY_USER}"
    sg docker -c "docker login -u ${DOCKER_REGISTRY_USER} -p ${DOCKER_REGISTRY_PASSWORD} --password-stdin"
    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
}

function generate_docker_images() {
    [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
    echo "Pulling and generating docker images"
    [ -n "${DOCKER_REGISTRY_URL}" ] && docker_login

    echo "Pulling docker images"

    if [ -z "$TO_REBUILD" ] || echo $TO_REBUILD | grep -q KAFKA ; then
        sg docker -c "docker pull wurstmeister/zookeeper" || FATAL "cannot get zookeeper docker image"
        sg docker -c "docker pull wurstmeister/kafka:${KAFKA_TAG}" || FATAL "cannot get kafka docker image"
    fi

    if [ -z "$TO_REBUILD" ] || echo $TO_REBUILD | grep -q PROMETHEUS ; then
        sg docker -c "docker pull prom/prometheus:${PROMETHEUS_TAG}" || FATAL "cannot get prometheus docker image"
    fi

    if [ -z "$TO_REBUILD" ] || echo $TO_REBUILD | grep -q PROMETHEUS-CADVISOR ; then
        sg docker -c "docker pull google/cadvisor:${PROMETHEUS_CADVISOR_TAG}" || FATAL "cannot get prometheus cadvisor docker image"
    fi

    if [ -z "$TO_REBUILD" ] || echo $TO_REBUILD | grep -q GRAFANA ; then
        sg docker -c "docker pull grafana/grafana:${GRAFANA_TAG}" || FATAL "cannot get grafana docker image"
        sg docker -c "docker pull kiwigrid/k8s-sidecar:${KIWIGRID_K8S_SIDECAR_TAG}" || FATAL "cannot get kiwigrid k8s-sidecar docker image"
    fi

    if [ -z "$TO_REBUILD" ] || echo $TO_REBUILD | grep -q NBI || echo $TO_REBUILD | grep -q KEYSTONE-DB ; then
        sg docker -c "docker pull mariadb:${KEYSTONEDB_TAG}" || FATAL "cannot get keystone-db docker image"
    fi

    if [ -z "$TO_REBUILD" ] || echo $TO_REBUILD | grep -q RO ; then
        sg docker -c "docker pull mysql:5" || FATAL "cannot get mysql docker image"
    fi

    if [ -n "$PULL_IMAGES" ]; then
        echo "Pulling OSM docker images"
        for module in MON POL NBI KEYSTONE RO LCM NG-UI PLA osmclient; do
            module_lower=${module,,}
            if [ $module == "PLA" -a ! -n "$INSTALL_PLA" ]; then
                continue
            fi
            module_tag="${OSM_DOCKER_TAG}"
            if [ -n "${MODULE_DOCKER_TAG}" ] && echo $TO_REBUILD | grep -q $module ; then
                module_tag="${MODULE_DOCKER_TAG}"
            fi
            echo "Pulling ${DOCKER_REGISTRY_URL}${DOCKER_USER}/${module_lower}:${module_tag} docker image"
            sg docker -c "docker pull ${DOCKER_REGISTRY_URL}${DOCKER_USER}/${module_lower}:${module_tag}" || FATAL "cannot pull $module docker image"
        done
    else
        _build_from=$COMMIT_ID
        [ -z "$_build_from" ] && _build_from="latest"
        echo "OSM Docker images generated from $_build_from"
        LWTEMPDIR="$(mktemp -d -q --tmpdir "installosmlight.XXXXXX")"
        trap 'rm -rf "${LWTEMPDIR}"' EXIT
        for module in MON POL NBI KEYSTONE RO LCM NG-UI PLA; do
            if [ -z "$TO_REBUILD" ] || echo $TO_REBUILD | grep -q ${module} ; then
                module_lower=${module,,}
                if [ $module == "PLA" -a ! -n "$INSTALL_PLA" ]; then
                    continue
                fi
                git -C ${LWTEMPDIR} clone https://osm.etsi.org/gerrit/osm/$module
                git -C ${LWTEMPDIR}/${module} checkout ${COMMIT_ID}
                sg docker -c "docker build ${LWTEMPDIR}/${module} -f ${LWTEMPDIR}/${module}/docker/Dockerfile -t ${DOCKER_USER}/${module_lower} --no-cache" || FATAL "cannot build ${module} docker image"
            fi
        done
        if [ -z "$TO_REBUILD" ] || echo $TO_REBUILD | grep -q osmclient; then
            BUILD_ARGS+=(--build-arg REPOSITORY="$REPOSITORY")
            BUILD_ARGS+=(--build-arg RELEASE="$RELEASE")
            BUILD_ARGS+=(--build-arg REPOSITORY_KEY="$REPOSITORY_KEY")
            BUILD_ARGS+=(--build-arg REPOSITORY_BASE="$REPOSITORY_BASE")
            sg docker -c "docker build -t ${DOCKER_USER}/osmclient ${BUILD_ARGS[@]} -f $OSM_DEVOPS/docker/osmclient ."
        fi
        echo "Finished generation of docker images"
    fi

    echo "Finished pulling and generating docker images"
    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
}

function cmp_overwrite() {
    [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
    file1="$1"
    file2="$2"
    if ! $(cmp "${file1}" "${file2}" >/dev/null 2>&1); then
        if [ -f "${file2}" ]; then
            ask_user "The file ${file2} already exists. Overwrite (y/N)? " n && cp -b ${file1} ${file2}
        else
            cp -b ${file1} ${file2}
        fi
    fi
    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
}

function generate_k8s_manifest_files() {
    [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
    #Kubernetes resources
    sudo cp -bR ${OSM_DEVOPS}/installers/docker/osm_pods $OSM_DOCKER_WORK_DIR
    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
}

function generate_prometheus_grafana_files() {
    #this only works with docker swarm
    [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
    # Prometheus files
    sudo mkdir -p $OSM_DOCKER_WORK_DIR/prometheus
    sudo cp -b ${OSM_DEVOPS}/installers/docker/prometheus/prometheus.yml $OSM_DOCKER_WORK_DIR/prometheus/prometheus.yml

    # Grafana files
    sudo mkdir -p $OSM_DOCKER_WORK_DIR/grafana
    sudo cp -b ${OSM_DEVOPS}/installers/docker/grafana/dashboards-osm.yml $OSM_DOCKER_WORK_DIR/grafana/dashboards-osm.yml
    sudo cp -b ${OSM_DEVOPS}/installers/docker/grafana/datasource-prometheus.yml $OSM_DOCKER_WORK_DIR/grafana/datasource-prometheus.yml
    sudo cp -b ${OSM_DEVOPS}/installers/docker/grafana/osm-sample-dashboard.json $OSM_DOCKER_WORK_DIR/grafana/osm-sample-dashboard.json
    sudo cp -b ${OSM_DEVOPS}/installers/docker/grafana/osm-system-dashboard.json $OSM_DOCKER_WORK_DIR/grafana/osm-system-dashboard.json

    # Prometheus Exporters files
    sudo mkdir -p $OSM_DOCKER_WORK_DIR/prometheus_exporters
    sudo cp -b ${OSM_DEVOPS}/installers/docker/prometheus_exporters/node_exporter.service $OSM_DOCKER_WORK_DIR/prometheus_exporters/node_exporter.service
    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
}

function generate_docker_env_files() {
    [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
    echo "Doing a backup of existing env files"
    sudo cp $OSM_DOCKER_WORK_DIR/keystone-db.env{,~}
    sudo cp $OSM_DOCKER_WORK_DIR/keystone.env{,~}
    sudo cp $OSM_DOCKER_WORK_DIR/lcm.env{,~}
    sudo cp $OSM_DOCKER_WORK_DIR/mon.env{,~}
    sudo cp $OSM_DOCKER_WORK_DIR/nbi.env{,~}
    sudo cp $OSM_DOCKER_WORK_DIR/pol.env{,~}
    sudo cp $OSM_DOCKER_WORK_DIR/ro-db.env{,~}
    sudo cp $OSM_DOCKER_WORK_DIR/ro.env{,~}

    echo "Generating docker env files"
    # LCM
    if [ ! -f $OSM_DOCKER_WORK_DIR/lcm.env ]; then
        echo "OSMLCM_DATABASE_COMMONKEY=${OSM_DATABASE_COMMONKEY}" | sudo tee -a $OSM_DOCKER_WORK_DIR/lcm.env
    fi

    if ! grep -Fq "OSMLCM_VCA_HOST" $OSM_DOCKER_WORK_DIR/lcm.env; then
        echo "OSMLCM_VCA_HOST=${OSM_VCA_HOST}" | sudo tee -a $OSM_DOCKER_WORK_DIR/lcm.env
    else
        sudo sed -i "s|OSMLCM_VCA_HOST.*|OSMLCM_VCA_HOST=$OSM_VCA_HOST|g" $OSM_DOCKER_WORK_DIR/lcm.env
    fi

    if ! grep -Fq "OSMLCM_VCA_SECRET" $OSM_DOCKER_WORK_DIR/lcm.env; then
        echo "OSMLCM_VCA_SECRET=${OSM_VCA_SECRET}" | sudo tee -a $OSM_DOCKER_WORK_DIR/lcm.env
    else
        sudo sed -i "s|OSMLCM_VCA_SECRET.*|OSMLCM_VCA_SECRET=$OSM_VCA_SECRET|g" $OSM_DOCKER_WORK_DIR/lcm.env
    fi

    if ! grep -Fq "OSMLCM_VCA_PUBKEY" $OSM_DOCKER_WORK_DIR/lcm.env; then
        echo "OSMLCM_VCA_PUBKEY=${OSM_VCA_PUBKEY}" | sudo tee -a $OSM_DOCKER_WORK_DIR/lcm.env
    else
        sudo sed -i "s|OSMLCM_VCA_PUBKEY.*|OSMLCM_VCA_PUBKEY=${OSM_VCA_PUBKEY}|g" $OSM_DOCKER_WORK_DIR/lcm.env
    fi

    if ! grep -Fq "OSMLCM_VCA_CACERT" $OSM_DOCKER_WORK_DIR/lcm.env; then
        echo "OSMLCM_VCA_CACERT=${OSM_VCA_CACERT}" | sudo tee -a $OSM_DOCKER_WORK_DIR/lcm.env
    else
        sudo sed -i "s|OSMLCM_VCA_CACERT.*|OSMLCM_VCA_CACERT=${OSM_VCA_CACERT}|g" $OSM_DOCKER_WORK_DIR/lcm.env
    fi

    if [ -n "$OSM_VCA_APIPROXY" ]; then
        if ! grep -Fq "OSMLCM_VCA_APIPROXY" $OSM_DOCKER_WORK_DIR/lcm.env; then
            echo "OSMLCM_VCA_APIPROXY=${OSM_VCA_APIPROXY}" | sudo tee -a $OSM_DOCKER_WORK_DIR/lcm.env
        else
            sudo sed -i "s|OSMLCM_VCA_APIPROXY.*|OSMLCM_VCA_APIPROXY=${OSM_VCA_APIPROXY}|g" $OSM_DOCKER_WORK_DIR/lcm.env
        fi
    fi

    if ! grep -Fq "OSMLCM_VCA_ENABLEOSUPGRADE" $OSM_DOCKER_WORK_DIR/lcm.env; then
        echo "# OSMLCM_VCA_ENABLEOSUPGRADE=false" | sudo tee -a $OSM_DOCKER_WORK_DIR/lcm.env
    fi

    if ! grep -Fq "OSMLCM_VCA_APTMIRROR" $OSM_DOCKER_WORK_DIR/lcm.env; then
        echo "# OSMLCM_VCA_APTMIRROR=http://archive.ubuntu.com/ubuntu/" | sudo tee -a $OSM_DOCKER_WORK_DIR/lcm.env
    fi

    if ! grep -Fq "OSMLCM_VCA_CLOUD" $OSM_DOCKER_WORK_DIR/lcm.env; then
        echo "OSMLCM_VCA_CLOUD=${OSM_VCA_CLOUDNAME}" | sudo tee -a $OSM_DOCKER_WORK_DIR/lcm.env
    else
        sudo sed -i "s|OSMLCM_VCA_CLOUD.*|OSMLCM_VCA_CLOUD=${OSM_VCA_CLOUDNAME}|g" $OSM_DOCKER_WORK_DIR/lcm.env
    fi

    if ! grep -Fq "OSMLCM_VCA_K8S_CLOUD" $OSM_DOCKER_WORK_DIR/lcm.env; then
        echo "OSMLCM_VCA_K8S_CLOUD=${OSM_VCA_K8S_CLOUDNAME}" | sudo tee -a $OSM_DOCKER_WORK_DIR/lcm.env
    else
        sudo sed -i "s|OSMLCM_VCA_K8S_CLOUD.*|OSMLCM_VCA_K8S_CLOUD=${OSM_VCA_K8S_CLOUDNAME}|g" $OSM_DOCKER_WORK_DIR/lcm.env
    fi

    # RO
    MYSQL_ROOT_PASSWORD=$(generate_secret)
    if [ ! -f $OSM_DOCKER_WORK_DIR/ro-db.env ]; then
        echo "MYSQL_ROOT_PASSWORD=${MYSQL_ROOT_PASSWORD}" |sudo tee $OSM_DOCKER_WORK_DIR/ro-db.env
    fi
    if [ ! -f $OSM_DOCKER_WORK_DIR/ro.env ]; then
        echo "RO_DB_ROOT_PASSWORD=${MYSQL_ROOT_PASSWORD}" |sudo tee $OSM_DOCKER_WORK_DIR/ro.env
    fi
    if ! grep -Fq "OSMRO_DATABASE_COMMONKEY" $OSM_DOCKER_WORK_DIR/ro.env; then
        echo "OSMRO_DATABASE_COMMONKEY=${OSM_DATABASE_COMMONKEY}" | sudo tee -a $OSM_DOCKER_WORK_DIR/ro.env
    fi

    # Keystone
    KEYSTONE_DB_PASSWORD=$(generate_secret)
    SERVICE_PASSWORD=$(generate_secret)
    if [ ! -f $OSM_DOCKER_WORK_DIR/keystone-db.env ]; then
        echo "MYSQL_ROOT_PASSWORD=${MYSQL_ROOT_PASSWORD}" |sudo tee $OSM_DOCKER_WORK_DIR/keystone-db.env
    fi
    if [ ! -f $OSM_DOCKER_WORK_DIR/keystone.env ]; then
        echo "ROOT_DB_PASSWORD=${MYSQL_ROOT_PASSWORD}" |sudo tee $OSM_DOCKER_WORK_DIR/keystone.env
        echo "KEYSTONE_DB_PASSWORD=${KEYSTONE_DB_PASSWORD}" |sudo tee -a $OSM_DOCKER_WORK_DIR/keystone.env
        echo "SERVICE_PASSWORD=${SERVICE_PASSWORD}" |sudo tee -a $OSM_DOCKER_WORK_DIR/keystone.env
    fi

    # NBI
    if [ ! -f $OSM_DOCKER_WORK_DIR/nbi.env ]; then
        echo "OSMNBI_AUTHENTICATION_SERVICE_PASSWORD=${SERVICE_PASSWORD}" |sudo tee $OSM_DOCKER_WORK_DIR/nbi.env
        echo "OSMNBI_DATABASE_COMMONKEY=${OSM_DATABASE_COMMONKEY}" | sudo tee -a $OSM_DOCKER_WORK_DIR/nbi.env
    fi

    # MON
    if [ ! -f $OSM_DOCKER_WORK_DIR/mon.env ]; then
        echo "OSMMON_KEYSTONE_SERVICE_PASSWORD=${SERVICE_PASSWORD}" | sudo tee -a $OSM_DOCKER_WORK_DIR/mon.env
        echo "OSMMON_DATABASE_COMMONKEY=${OSM_DATABASE_COMMONKEY}" | sudo tee -a $OSM_DOCKER_WORK_DIR/mon.env
        echo "OSMMON_SQL_DATABASE_URI=mysql://root:${MYSQL_ROOT_PASSWORD}@mysql:3306/mon" | sudo tee -a $OSM_DOCKER_WORK_DIR/mon.env
    fi

    if ! grep -Fq "OS_NOTIFIER_URI" $OSM_DOCKER_WORK_DIR/mon.env; then
        echo "OS_NOTIFIER_URI=http://${DEFAULT_IP}:8662" |sudo tee -a $OSM_DOCKER_WORK_DIR/mon.env
    else
        sudo sed -i "s|OS_NOTIFIER_URI.*|OS_NOTIFIER_URI=http://$DEFAULT_IP:8662|g" $OSM_DOCKER_WORK_DIR/mon.env
    fi

    if ! grep -Fq "OSMMON_VCA_HOST" $OSM_DOCKER_WORK_DIR/mon.env; then
        echo "OSMMON_VCA_HOST=${OSM_VCA_HOST}" | sudo tee -a $OSM_DOCKER_WORK_DIR/mon.env
    else
        sudo sed -i "s|OSMMON_VCA_HOST.*|OSMMON_VCA_HOST=$OSM_VCA_HOST|g" $OSM_DOCKER_WORK_DIR/mon.env
    fi

    if ! grep -Fq "OSMMON_VCA_SECRET" $OSM_DOCKER_WORK_DIR/mon.env; then
        echo "OSMMON_VCA_SECRET=${OSM_VCA_SECRET}" | sudo tee -a $OSM_DOCKER_WORK_DIR/mon.env
    else
        sudo sed -i "s|OSMMON_VCA_SECRET.*|OSMMON_VCA_SECRET=$OSM_VCA_SECRET|g" $OSM_DOCKER_WORK_DIR/mon.env
    fi

    if ! grep -Fq "OSMMON_VCA_CACERT" $OSM_DOCKER_WORK_DIR/mon.env; then
        echo "OSMMON_VCA_CACERT=${OSM_VCA_CACERT}" | sudo tee -a $OSM_DOCKER_WORK_DIR/mon.env
    else
        sudo sed -i "s|OSMMON_VCA_CACERT.*|OSMMON_VCA_CACERT=${OSM_VCA_CACERT}|g" $OSM_DOCKER_WORK_DIR/mon.env
    fi


    # POL
    if [ ! -f $OSM_DOCKER_WORK_DIR/pol.env ]; then
        echo "OSMPOL_SQL_DATABASE_URI=mysql://root:${MYSQL_ROOT_PASSWORD}@mysql:3306/pol" | sudo tee -a $OSM_DOCKER_WORK_DIR/pol.env
    fi

    echo "Finished generation of docker env files"
    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
}

#creates secrets from env files which will be used by containers
function kube_secrets(){
    [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
    kubectl create ns $OSM_STACK_NAME
    kubectl create secret generic lcm-secret -n $OSM_STACK_NAME --from-env-file=$OSM_DOCKER_WORK_DIR/lcm.env
    kubectl create secret generic mon-secret -n $OSM_STACK_NAME --from-env-file=$OSM_DOCKER_WORK_DIR/mon.env
    kubectl create secret generic nbi-secret -n $OSM_STACK_NAME --from-env-file=$OSM_DOCKER_WORK_DIR/nbi.env
    kubectl create secret generic ro-db-secret -n $OSM_STACK_NAME --from-env-file=$OSM_DOCKER_WORK_DIR/ro-db.env
    kubectl create secret generic ro-secret -n $OSM_STACK_NAME --from-env-file=$OSM_DOCKER_WORK_DIR/ro.env
    kubectl create secret generic keystone-secret -n $OSM_STACK_NAME --from-env-file=$OSM_DOCKER_WORK_DIR/keystone.env
    kubectl create secret generic pol-secret -n $OSM_STACK_NAME --from-env-file=$OSM_DOCKER_WORK_DIR/pol.env
    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
}

#deploys osm pods and services
function deploy_osm_services() {
    [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
    kubectl apply -n $OSM_STACK_NAME -f $OSM_K8S_WORK_DIR
    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
}

#deploy charmed services
function deploy_charmed_services() {
    [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
    juju add-model $OSM_STACK_NAME $OSM_VCA_K8S_CLOUDNAME
    juju deploy ch:mongodb-k8s -m $OSM_STACK_NAME
    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
}

function deploy_osm_pla_service() {
    [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
    # corresponding to namespace_vol
    sudo  sed -i "s#path: /var/lib/osm#path: $OSM_NAMESPACE_VOL#g" $OSM_DOCKER_WORK_DIR/osm_pla/pla.yaml
    # corresponding to deploy_osm_services
    kubectl apply -n $OSM_STACK_NAME -f $OSM_DOCKER_WORK_DIR/osm_pla
    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
}

function parse_yaml() {
    [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
    TAG=$1
    shift
    services=$@
    for module in $services; do
        if [ "$module" == "pla" ]; then
            if [ -n "$INSTALL_PLA" ]; then
                echo "Updating K8s manifest file from opensourcemano\/${module}:.* to ${DOCKER_REGISTRY_URL}${DOCKER_USER}\/${module}:${TAG}"
                sudo sed -i "s#opensourcemano/pla:.*#${DOCKER_REGISTRY_URL}${DOCKER_USER}/pla:${TAG}#g" ${OSM_DOCKER_WORK_DIR}/osm_pla/pla.yaml
            fi
        else
            echo "Updating K8s manifest file from opensourcemano\/${module}:.* to ${DOCKER_REGISTRY_URL}${DOCKER_USER}\/${module}:${TAG}"
            sudo sed -i "s#opensourcemano/${module}:.*#${DOCKER_REGISTRY_URL}${DOCKER_USER}/${module}:${TAG}#g" ${OSM_K8S_WORK_DIR}/${module}.yaml
        fi
    done
    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
}

function update_manifest_files() {
    osm_services="nbi lcm ro pol mon ng-ui keystone pla prometheus"
    list_of_services=""
    for module in $osm_services; do
        module_upper="${module^^}"
        if ! echo $TO_REBUILD | grep -q $module_upper ; then
            list_of_services="$list_of_services $module"
        fi
    done
    if [ ! "$OSM_DOCKER_TAG" == "12" ]; then
        parse_yaml $OSM_DOCKER_TAG $list_of_services
    fi
    if [ -n "$MODULE_DOCKER_TAG" ]; then
        parse_yaml $MODULE_DOCKER_TAG $list_of_services_to_rebuild
    fi
    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
}

function namespace_vol() {
    [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
    osm_services="nbi lcm ro pol mon kafka mysql prometheus"
    for osm in $osm_services; do
        sudo  sed -i "s#path: /var/lib/osm#path: $OSM_NAMESPACE_VOL#g" $OSM_K8S_WORK_DIR/$osm.yaml
    done
    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
}

function add_local_k8scluster() {
    [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
    /usr/bin/osm --all-projects vim-create \
      --name _system-osm-vim \
      --account_type dummy \
      --auth_url http://dummy \
      --user osm --password osm --tenant osm \
      --description "dummy" \
      --config '{management_network_name: mgmt}'
    /usr/bin/osm --all-projects k8scluster-add \
      --creds ${HOME}/.kube/config \
      --vim _system-osm-vim \
      --k8s-nets '{"net1": null}' \
      --version '1.15' \
      --description "OSM Internal Cluster" \
      _system-osm-k8s
    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
}

function configure_apt_proxy() {
    [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
    OSM_APT_PROXY=$1
    OSM_APT_PROXY_FILE="/etc/apt/apt.conf.d/osm-apt"
    echo "Configuring apt proxy in file ${OSM_APT_PROXY_FILE}"
    if [ ! -f ${OSM_APT_PROXY_FILE} ]; then
        sudo bash -c "cat <<EOF > ${OSM_APT_PROXY}
Acquire::http { Proxy \"${OSM_APT_PROXY}\"; }
EOF"
    else
        sudo sed -i "s|Proxy.*|Proxy \"${OSM_APT_PROXY}\"; }|" ${OSM_APT_PROXY_FILE}
    fi
    sudo apt-get update || FATAL "Configured apt proxy, but couldn't run 'apt-get update'. Check ${OSM_APT_PROXY_FILE}"
    track prereq apt_proxy_configured_ok
    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
}

function install_osm() {
    [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function

    trap ctrl_c INT
    track start release $RELEASE none none docker_tag $OSM_DOCKER_TAG none none installation_type $OSM_INSTALLATION_TYPE none none

    track checks checkingroot_ok
    [ "$USER" == "root" ] && FATAL "You are running the installer as root. The installer is prepared to be executed as a normal user with sudo privileges."
    track checks noroot_ok

    [ -z "$ASSUME_YES" ] && ! ask_user "The installation will do the following
    1. Install and configure LXD
    2. Install juju
    3. Install docker CE
    4. Disable swap space
    5. Install and initialize Kubernetes
    as pre-requirements.
    Do you want to proceed (Y/n)? " y && echo "Cancelled!" && exit 1
    track checks proceed_ok

    echo "Installing OSM"

    echo "Determining IP address of the interface with the default route"
    DEFAULT_IF=$(ip route list|awk '$1=="default" {print $5; exit}')
    [ -z "$DEFAULT_IF" ] && DEFAULT_IF=$(route -n |awk '$1~/^0.0.0.0/ {print $8; exit}')
    [ -z "$DEFAULT_IF" ] && FATAL "Not possible to determine the interface with the default route 0.0.0.0"
    DEFAULT_IP=`ip -o -4 a s ${DEFAULT_IF} |awk '{split($4,a,"/"); print a[1]; exit}'`
    [ -z "$DEFAULT_IP" ] && FATAL "Not possible to determine the IP address of the interface with the default route"

    # configure apt proxy
    [ -n "$APT_PROXY_URL" ] && configure_apt_proxy $APT_PROXY_URL

    # if no host is passed in, we need to install lxd/juju, unless explicilty asked not to
    if [ -z "$OSM_VCA_HOST" ] && [ -z "$INSTALL_NOLXD" ] && [ -z "$LXD_CLOUD_FILE" ]; then
        install_lxd
    fi

    track prereq prereqok_ok

    if [ ! -n "$INSTALL_NODOCKER" ]; then
        DOCKER_CE_OPTS="-D ${OSM_DEVOPS} ${DEBUG_INSTALL}"
        [ -n "${DOCKER_PROXY_URL}" ] && DOCKER_CE_OPTS="${DOCKER_CE_OPTS} -p ${DOCKER_PROXY_URL}"
        $OSM_DEVOPS/installers/install_docker_ce.sh ${DOCKER_CE_OPTS} || FATAL_TRACK docker_ce "install_docker_ce.sh failed"
    fi

    track docker_ce docker_ce_ok

    echo "Creating folders for installation"
    [ ! -d "$OSM_DOCKER_WORK_DIR" ] && sudo mkdir -p $OSM_DOCKER_WORK_DIR
    [ ! -d "$OSM_DOCKER_WORK_DIR/osm_pla" -a -n "$INSTALL_PLA" ] && sudo mkdir -p $OSM_DOCKER_WORK_DIR/osm_pla
    sudo cp -b $OSM_DEVOPS/installers/docker/cluster-config.yaml $OSM_DOCKER_WORK_DIR/cluster-config.yaml

    $OSM_DEVOPS/installers/install_kubeadm_cluster.sh -i ${DEFAULT_IP} -d ${OSM_DOCKER_WORK_DIR} -D ${OSM_DEVOPS} ${DEBUG_INSTALL} || \
    FATAL_TRACK k8scluster "install_kubeadm_cluster.sh failed"
    track k8scluster k8scluster_ok

    JUJU_OPTS="-D ${OSM_DEVOPS} -s ${OSM_STACK_NAME} -i ${DEFAULT_IP} ${DEBUG_INSTALL} ${INSTALL_NOJUJU} ${INSTALL_CACHELXDIMAGES}"
    [ -n "${OSM_VCA_HOST}" ] && JUJU_OPTS="$JUJU_OPTS -H ${OSM_VCA_HOST}"
    [ -n "${LXD_CLOUD_FILE}" ] && JUJU_OPTS="$JUJU_OPTS -l ${LXD_CLOUD_FILE}"
    [ -n "${LXD_CRED_FILE}" ] && JUJU_OPTS="$JUJU_OPTS -L ${LXD_CRED_FILE}"
    [ -n "${CONTROLLER_NAME}" ] && JUJU_OPTS="$JUJU_OPTS -K ${CONTROLLER_NAME}"
    $OSM_DEVOPS/installers/install_juju.sh ${JUJU_OPTS} || FATAL_TRACK juju "install_juju.sh failed"
    set_vca_variables
    track juju juju_ok

    if [ -z "$OSM_DATABASE_COMMONKEY" ]; then
        OSM_DATABASE_COMMONKEY=$(generate_secret)
        [ -z "OSM_DATABASE_COMMONKEY" ] && FATAL "Cannot generate common db secret"
    fi

    # Deploy OSM services
    [ -z "$DOCKER_NOBUILD" ] && generate_docker_images
    track docker_images docker_images_ok

    generate_k8s_manifest_files
    track osm_files manifest_files_ok
    generate_docker_env_files
    track osm_files env_files_ok

    deploy_charmed_services
    track deploy_osm deploy_charmed_services_ok
    kube_secrets
    track deploy_osm kube_secrets_ok
    update_manifest_files
    track deploy_osm update_manifest_files_ok
    namespace_vol
    track deploy_osm namespace_vol_ok
    deploy_osm_services
    track deploy_osm deploy_osm_services_k8s_ok
    if [ -n "$INSTALL_PLA"]; then
        # optional PLA install
        deploy_osm_pla_service
        track deploy_osm deploy_osm_pla_ok
    fi
    if [ -n "$INSTALL_K8S_MONITOR" ]; then
        # install OSM MONITORING
        install_k8s_monitoring
        track deploy_osm install_k8s_monitoring_ok
    fi

    [ -z "$INSTALL_NOHOSTCLIENT" ] && install_osmclient
    track osmclient osmclient_ok

    echo -e "Checking OSM health state..."
    $OSM_DEVOPS/installers/osm_health.sh -s ${OSM_STACK_NAME} -k || \
    (echo -e "OSM is not healthy, but will probably converge to a healthy state soon." && \
    echo -e "Check OSM status with: kubectl -n ${OSM_STACK_NAME} get all" && \
    track healthchecks osm_unhealthy didnotconverge)
    track healthchecks after_healthcheck_ok

    add_local_k8scluster
    track final_ops add_local_k8scluster_ok

    wget -q -O- https://osm-download.etsi.org/ftp/osm-12.0-twelve/README2.txt &> /dev/null
    track end
    sudo find /etc/osm
    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
    return 0
}

function install_to_openstack() {
    [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function

    if [ -z "$2" ]; then
        FATAL "OpenStack installer requires a valid external network name"
    fi

    # Install Pip for Python3
    sudo apt install -y python3-pip python3-venv
    sudo -H LC_ALL=C python3 -m pip install -U pip

    # Create a venv to avoid conflicts with the host installation
    python3 -m venv $OPENSTACK_PYTHON_VENV

    source $OPENSTACK_PYTHON_VENV/bin/activate

    # Install Ansible, OpenStack client and SDK, latest openstack version supported is Train
    python -m pip install -U wheel
    python -m pip install -U "python-openstackclient<=4.0.2" "openstacksdk>=0.12.0,<=0.36.2" "ansible>=2.10,<2.11"

    # Install the Openstack cloud module (ansible>=2.10)
    ansible-galaxy collection install openstack.cloud

    export ANSIBLE_CONFIG="$OSM_DEVOPS/installers/openstack/ansible.cfg"

    OSM_INSTALLER_ARGS="${REPO_ARGS[@]}"

    ANSIBLE_VARS="external_network_name=$2 setup_volume=$3 server_name=$OPENSTACK_VM_NAME"

    if [ -n "$OPENSTACK_SSH_KEY_FILE" ]; then
        ANSIBLE_VARS+=" key_file=$OPENSTACK_SSH_KEY_FILE"
    fi

    if [ -n "$OPENSTACK_USERDATA_FILE" ]; then
        ANSIBLE_VARS+=" userdata_file=$OPENSTACK_USERDATA_FILE"
    fi

    # Execute the Ansible playbook based on openrc or clouds.yaml
    if [ -e "$1" ]; then
        . $1
        ansible-playbook -e installer_args="\"$OSM_INSTALLER_ARGS\"" -e "$ANSIBLE_VARS" \
        $OSM_DEVOPS/installers/openstack/site.yml
    else
        ansible-playbook -e installer_args="\"$OSM_INSTALLER_ARGS\"" -e "$ANSIBLE_VARS" \
        -e cloud_name=$1 $OSM_DEVOPS/installers/openstack/site.yml
    fi

    # Exit from venv
    deactivate

    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
    return 0
}

function install_k8s_monitoring() {
    [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
    # install OSM monitoring
    sudo chmod +x $OSM_DEVOPS/installers/k8s/*.sh
    sudo $OSM_DEVOPS/installers/k8s/install_osm_k8s_monitoring.sh || FATAL_TRACK install_k8s_monitoring "k8s/install_osm_k8s_monitoring.sh failed"
    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
}

function dump_vars(){
    [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
    echo "APT_PROXY_URL=$APT_PROXY_URL"
    echo "DEVELOP=$DEVELOP"
    echo "DEBUG_INSTALL=$DEBUG_INSTALL"
    echo "DOCKER_NOBUILD=$DOCKER_NOBUILD"
    echo "DOCKER_PROXY_URL=$DOCKER_PROXY_URL"
    echo "DOCKER_REGISTRY_URL=$DOCKER_REGISTRY_URL"
    echo "DOCKER_USER=$DOCKER_USER"
    echo "INSTALL_CACHELXDIMAGES=$INSTALL_CACHELXDIMAGES"
    echo "INSTALL_FROM_SOURCE=$INSTALL_FROM_SOURCE"
    echo "INSTALL_K8S_MONITOR=$INSTALL_K8S_MONITOR"
    echo "INSTALL_LIGHTWEIGHT=$INSTALL_LIGHTWEIGHT"
    echo "INSTALL_LXD=$INSTALL_LXD"
    echo "INSTALL_NODOCKER=$INSTALL_NODOCKER"
    echo "INSTALL_NOJUJU=$INSTALL_NOJUJU"
    echo "INSTALL_NOLXD=$INSTALL_NOLXD"
    echo "INSTALL_ONLY=$INSTALL_ONLY"
    echo "INSTALL_PLA=$INSTALL_PLA"
    echo "INSTALL_TO_OPENSTACK=$INSTALL_TO_OPENSTACK"
    echo "INSTALL_VIMEMU=$INSTALL_VIMEMU"
    echo "NO_HOST_PORTS=$NO_HOST_PORTS"
    echo "OPENSTACK_PUBLIC_NET_NAME=$OPENSTACK_PUBLIC_NET_NAME"
    echo "OPENSTACK_OPENRC_FILE_OR_CLOUD=$OPENSTACK_OPENRC_FILE_OR_CLOUD"
    echo "OPENSTACK_ATTACH_VOLUME=$OPENSTACK_ATTACH_VOLUME"
    echo "OPENSTACK_SSH_KEY_FILE"="$OPENSTACK_SSH_KEY_FILE"
    echo "OPENSTACK_USERDATA_FILE"="$OPENSTACK_USERDATA_FILE"
    echo "OPENSTACK_VM_NAME"="$OPENSTACK_VM_NAME"
    echo "OSM_DEVOPS=$OSM_DEVOPS"
    echo "OSM_DOCKER_TAG=$OSM_DOCKER_TAG"
    echo "OSM_DOCKER_WORK_DIR=$OSM_DOCKER_WORK_DIR"
    echo "OSM_K8S_WORK_DIR=$OSM_K8S_WORK_DIR"
    echo "OSM_STACK_NAME=$OSM_STACK_NAME"
    echo "OSM_VCA_HOST=$OSM_VCA_HOST"
    echo "OSM_VCA_PUBKEY=$OSM_VCA_PUBKEY"
    echo "OSM_VCA_SECRET=$OSM_VCA_SECRET"
    echo "OSM_WORK_DIR=$OSM_WORK_DIR"
    echo "PULL_IMAGES=$PULL_IMAGES"
    echo "RECONFIGURE=$RECONFIGURE"
    echo "RELEASE=$RELEASE"
    echo "REPOSITORY=$REPOSITORY"
    echo "REPOSITORY_BASE=$REPOSITORY_BASE"
    echo "REPOSITORY_KEY=$REPOSITORY_KEY"
    echo "SHOWOPTS=$SHOWOPTS"
    echo "TEST_INSTALLER=$TEST_INSTALLER"
    echo "TO_REBUILD=$TO_REBUILD"
    echo "UNINSTALL=$UNINSTALL"
    echo "UPDATE=$UPDATE"
    echo "Install from specific refspec (-b): $COMMIT_ID"
    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
}

function parse_docker_registry_url() {
    [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
    DOCKER_REGISTRY_USER=$(echo "$DOCKER_REGISTRY_URL" | awk '{split($1,a,"@"); split(a[1],b,":"); print b[1]}')
    DOCKER_REGISTRY_PASSWORD=$(echo "$DOCKER_REGISTRY_URL" | awk '{split($1,a,"@"); split(a[1],b,":"); print b[2]}')
    DOCKER_REGISTRY_URL=$(echo "$DOCKER_REGISTRY_URL" | awk '{split($1,a,"@"); print a[2]}')
    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
}

function ctrl_c() {
    [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
    echo "** Trapped CTRL-C"
    FATAL "User stopped the installation"
    [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
}

LXD_VERSION=5.0
JUJU_VERSION=2.9
JUJU_AGENT_VERSION=2.9.29
UNINSTALL=""
DEVELOP=""
UPDATE=""
RECONFIGURE=""
TEST_INSTALLER=""
INSTALL_LXD=""
SHOWOPTS=""
COMMIT_ID=""
ASSUME_YES=""
APT_PROXY_URL=""
INSTALL_FROM_SOURCE=""
DEBUG_INSTALL=""
RELEASE="ReleaseTEN"
REPOSITORY="stable"
INSTALL_VIMEMU=""
INSTALL_PLA=""
LXD_REPOSITORY_BASE="https://osm-download.etsi.org/repository/osm/lxd"
LXD_REPOSITORY_PATH=""
INSTALL_LIGHTWEIGHT="y"
INSTALL_TO_OPENSTACK=""
OPENSTACK_OPENRC_FILE_OR_CLOUD=""
OPENSTACK_PUBLIC_NET_NAME=""
OPENSTACK_ATTACH_VOLUME="false"
OPENSTACK_SSH_KEY_FILE=""
OPENSTACK_USERDATA_FILE=""
OPENSTACK_VM_NAME="server-osm"
OPENSTACK_PYTHON_VENV="$HOME/.virtual-envs/osm"
INSTALL_ONLY=""
TO_REBUILD=""
INSTALL_NOLXD=""
INSTALL_NODOCKER=""
INSTALL_NOJUJU=""
INSTALL_K8S_MONITOR=""
INSTALL_NOHOSTCLIENT=""
INSTALL_CACHELXDIMAGES=""
OSM_DEVOPS=
OSM_VCA_HOST=
OSM_VCA_SECRET=
OSM_VCA_PUBKEY=
OSM_VCA_CLOUDNAME="localhost"
OSM_VCA_K8S_CLOUDNAME="k8scloud"
OSM_STACK_NAME=osm
NO_HOST_PORTS=""
DOCKER_NOBUILD=""
REPOSITORY_KEY="OSM%20ETSI%20Release%20Key.gpg"
REPOSITORY_BASE="https://osm-download.etsi.org/repository/osm/debian"
OSM_WORK_DIR="/etc/osm"
OSM_DOCKER_WORK_DIR="/etc/osm/docker"
OSM_K8S_WORK_DIR="${OSM_DOCKER_WORK_DIR}/osm_pods"
OSM_HOST_VOL="/var/lib/osm"
OSM_NAMESPACE_VOL="${OSM_HOST_VOL}/${OSM_STACK_NAME}"
OSM_DOCKER_TAG=latest
DOCKER_USER=opensourcemano
PULL_IMAGES="y"
KAFKA_TAG=2.11-1.0.2
KIWIGRID_K8S_SIDECAR_TAG="1.15.6"
PROMETHEUS_TAG=v2.28.1
GRAFANA_TAG=8.1.1
PROMETHEUS_NODE_EXPORTER_TAG=0.18.1
PROMETHEUS_CADVISOR_TAG=latest
KEYSTONEDB_TAG=10
OSM_DATABASE_COMMONKEY=
ELASTIC_VERSION=6.4.2
ELASTIC_CURATOR_VERSION=5.5.4
POD_NETWORK_CIDR=10.244.0.0/16
K8S_MANIFEST_DIR="/etc/kubernetes/manifests"
RE_CHECK='^[a-z0-9]([-a-z0-9]*[a-z0-9])?$'
DOCKER_REGISTRY_URL=
DOCKER_PROXY_URL=
MODULE_DOCKER_TAG=
OSM_INSTALLATION_TYPE="Default"

while getopts ":a:b:r:n:k:u:R:D:o:O:m:N:H:S:s:t:U:P:A:l:L:K:d:p:T:f:F:-: hy" o; do
    case "${o}" in
        a)
            APT_PROXY_URL=${OPTARG}
            ;;
        b)
            COMMIT_ID=${OPTARG}
            PULL_IMAGES=""
            ;;
        r)
            REPOSITORY="${OPTARG}"
            REPO_ARGS+=(-r "$REPOSITORY")
            ;;
        k)
            REPOSITORY_KEY="${OPTARG}"
            REPO_ARGS+=(-k "$REPOSITORY_KEY")
            ;;
        u)
            REPOSITORY_BASE="${OPTARG}"
            REPO_ARGS+=(-u "$REPOSITORY_BASE")
            ;;
        R)
            RELEASE="${OPTARG}"
            REPO_ARGS+=(-R "$RELEASE")
            ;;
        D)
            OSM_DEVOPS="${OPTARG}"
            ;;
        o)
            INSTALL_ONLY="y"
            [ "${OPTARG}" == "k8s_monitor" ] && INSTALL_K8S_MONITOR="y" && continue
            ;;
        O)
            INSTALL_TO_OPENSTACK="y"
            if [ -n "${OPTARG}" ]; then
                OPENSTACK_OPENRC_FILE_OR_CLOUD="${OPTARG}"
            else
                echo -e "Invalid argument for -O : ' $OPTARG'\n" >&2
                usage && exit 1
            fi
            ;;
        f)
            OPENSTACK_SSH_KEY_FILE="${OPTARG}"
            ;;
        F)
            OPENSTACK_USERDATA_FILE="${OPTARG}"
            ;;
        N)
            OPENSTACK_PUBLIC_NET_NAME="${OPTARG}"
            ;;
        m)
            [ "${OPTARG}" == "NG-UI" ] && TO_REBUILD="$TO_REBUILD NG-UI" && continue
            [ "${OPTARG}" == "NBI" ] && TO_REBUILD="$TO_REBUILD NBI" && continue
            [ "${OPTARG}" == "LCM" ] && TO_REBUILD="$TO_REBUILD LCM" && continue
            [ "${OPTARG}" == "RO" ] && TO_REBUILD="$TO_REBUILD RO" && continue
            [ "${OPTARG}" == "MON" ] && TO_REBUILD="$TO_REBUILD MON" && continue
            [ "${OPTARG}" == "POL" ] && TO_REBUILD="$TO_REBUILD POL" && continue
            [ "${OPTARG}" == "PLA" ] && TO_REBUILD="$TO_REBUILD PLA" && continue
            [ "${OPTARG}" == "osmclient" ] && TO_REBUILD="$TO_REBUILD osmclient" && continue
            [ "${OPTARG}" == "KAFKA" ] && TO_REBUILD="$TO_REBUILD KAFKA" && continue
            [ "${OPTARG}" == "MONGO" ] && TO_REBUILD="$TO_REBUILD MONGO" && continue
            [ "${OPTARG}" == "PROMETHEUS" ] && TO_REBUILD="$TO_REBUILD PROMETHEUS" && continue
            [ "${OPTARG}" == "PROMETHEUS-CADVISOR" ] && TO_REBUILD="$TO_REBUILD PROMETHEUS-CADVISOR" && continue
            [ "${OPTARG}" == "KEYSTONE-DB" ] && TO_REBUILD="$TO_REBUILD KEYSTONE-DB" && continue
            [ "${OPTARG}" == "GRAFANA" ] && TO_REBUILD="$TO_REBUILD GRAFANA" && continue
            [ "${OPTARG}" == "NONE" ] && TO_REBUILD="$TO_REBUILD NONE" && continue
            ;;
        H)
            OSM_VCA_HOST="${OPTARG}"
            ;;
        S)
            OSM_VCA_SECRET="${OPTARG}"
            ;;
        s)
            OSM_STACK_NAME="${OPTARG}" && [[ ! "${OPTARG}" =~ $RE_CHECK ]] && echo "Namespace $OPTARG is invalid. Regex used for validation is $RE_CHECK" && exit 0
            ;;
        t)
            OSM_DOCKER_TAG="${OPTARG}"
            REPO_ARGS+=(-t "$OSM_DOCKER_TAG")
            ;;
        U)
            DOCKER_USER="${OPTARG}"
            ;;
        P)
            OSM_VCA_PUBKEY=$(cat ${OPTARG})
            ;;
        A)
            OSM_VCA_APIPROXY="${OPTARG}"
            ;;
        l)
            LXD_CLOUD_FILE="${OPTARG}"
            ;;
        L)
            LXD_CRED_FILE="${OPTARG}"
            ;;
        K)
            CONTROLLER_NAME="${OPTARG}"
            ;;
        d)
            DOCKER_REGISTRY_URL="${OPTARG}"
            ;;
        p)
            DOCKER_PROXY_URL="${OPTARG}"
            ;;
        T)
            MODULE_DOCKER_TAG="${OPTARG}"
            ;;
        -)
            [ "${OPTARG}" == "help" ] && usage && exit 0
            [ "${OPTARG}" == "source" ] && INSTALL_FROM_SOURCE="y" && PULL_IMAGES="" && continue
            [ "${OPTARG}" == "debug" ] && DEBUG_INSTALL="--debug" && continue
            [ "${OPTARG}" == "develop" ] && DEVELOP="y" && continue
            [ "${OPTARG}" == "uninstall" ] && UNINSTALL="y" && continue
            [ "${OPTARG}" == "update" ] && UPDATE="y" && continue
            [ "${OPTARG}" == "reconfigure" ] && RECONFIGURE="y" && continue
            [ "${OPTARG}" == "test" ] && TEST_INSTALLER="y" && continue
            [ "${OPTARG}" == "lxdinstall" ] && INSTALL_LXD="y" && continue
            [ "${OPTARG}" == "nolxd" ] && INSTALL_NOLXD="y" && continue
            [ "${OPTARG}" == "nodocker" ] && INSTALL_NODOCKER="y" && continue
            [ "${OPTARG}" == "showopts" ] && SHOWOPTS="y" && continue
            [ "${OPTARG}" == "nohostports" ] && NO_HOST_PORTS="y" && continue
            [ "${OPTARG}" == "nojuju" ] && INSTALL_NOJUJU="--nojuju" && continue
            [ "${OPTARG}" == "nodockerbuild" ] && DOCKER_NOBUILD="y" && continue
            [ "${OPTARG}" == "nohostclient" ] && INSTALL_NOHOSTCLIENT="y" && continue
            [ "${OPTARG}" == "pullimages" ] && continue
            [ "${OPTARG}" == "k8s_monitor" ] && INSTALL_K8S_MONITOR="y" && continue
            [ "${OPTARG}" == "charmed" ] && CHARMED="y" && OSM_INSTALLATION_TYPE="Charmed" && continue
            [ "${OPTARG}" == "bundle" ] && continue
            [ "${OPTARG}" == "k8s" ] && continue
            [ "${OPTARG}" == "lxd" ] && continue
            [ "${OPTARG}" == "lxd-cred" ] && continue
            [ "${OPTARG}" == "microstack" ] && continue
            [ "${OPTARG}" == "overlay" ] && continue
            [ "${OPTARG}" == "only-vca" ] && continue
            [ "${OPTARG}" == "small-profile" ] && continue
            [ "${OPTARG}" == "vca" ] && continue
            [ "${OPTARG}" == "ha" ] && continue
            [ "${OPTARG}" == "tag" ] && continue
            [ "${OPTARG}" == "registry" ] && continue
            [ "${OPTARG}" == "pla" ] && INSTALL_PLA="y" && continue
            [ "${OPTARG}" == "volume" ] && OPENSTACK_ATTACH_VOLUME="true" && continue
            [ "${OPTARG}" == "nocachelxdimages" ] && continue
            [ "${OPTARG}" == "cachelxdimages" ] && INSTALL_CACHELXDIMAGES="--cachelxdimages" && continue
            echo -e "Invalid option: '--$OPTARG'\n" >&2
            usage && exit 1
            ;;
        :)
            echo "Option -$OPTARG requires an argument" >&2
            usage && exit 1
            ;;
        \?)
            echo -e "Invalid option: '-$OPTARG'\n" >&2
            usage && exit 1
            ;;
        h)
            usage && exit 0
            ;;
        y)
            ASSUME_YES="y"
            ;;
        *)
            usage && exit 1
            ;;
    esac
done

source $OSM_DEVOPS/common/all_funcs

[ -z "${DEBUG_INSTALL}" ] || DEBUG Debug is on
[ -n "$SHOWOPTS" ] && dump_vars && exit 0

# Uninstall if "--uninstall"
if [ -n "$UNINSTALL" ]; then
    if [ -n "$CHARMED" ]; then
        ${OSM_DEVOPS}/installers/charmed_uninstall.sh -R $RELEASE -r $REPOSITORY -u $REPOSITORY_BASE -D $OSM_DEVOPS -t $DOCKER_TAG "$@" || \
        FATAL_TRACK charmed_uninstall "charmed_uninstall.sh failed"
    else
        ${OSM_DEVOPS}/installers/uninstall_osm.sh "$@" || \
        FATAL_TRACK community_uninstall "uninstall_osm.sh failed"
    fi
    echo -e "\nDONE"
    exit 0
fi

# Charmed installation
if [ -n "$CHARMED" ]; then
    export OSM_TRACK_INSTALLATION_ID="$(date +%s)-$(head /dev/urandom | tr -dc A-Za-z0-9 | head -c 16)"
    track start release $RELEASE none none docker_tag $OSM_DOCKER_TAG none none installation_type $OSM_INSTALLATION_TYPE none none
    ${OSM_DEVOPS}/installers/charmed_install.sh --tag $OSM_DOCKER_TAG "$@" || \
    FATAL_TRACK charmed_install "charmed_install.sh failed"
    wget -q -O- https://osm-download.etsi.org/ftp/osm-12.0-twelve/README2.txt &> /dev/null
    track end installation_type $OSM_INSTALLATION_TYPE
    echo -e "\nDONE"
    exit 0
fi

# Installation to Openstack
if [ -n "$INSTALL_TO_OPENSTACK" ]; then
    install_to_openstack $OPENSTACK_OPENRC_FILE_OR_CLOUD $OPENSTACK_PUBLIC_NET_NAME $OPENSTACK_ATTACH_VOLUME
    echo -e "\nDONE"
    exit 0
fi

# Community_installer
[ -n "$DOCKER_REGISTRY_URL" ] && parse_docker_registry_url
[ -n "$TO_REBUILD" ] && [ "$TO_REBUILD" != " NONE" ] && echo $TO_REBUILD | grep -q NONE && FATAL "Incompatible option: -m NONE cannot be used with other -m options"
[ -n "$TO_REBUILD" ] && [ "$TO_REBUILD" == " PLA" ] && [ -z "$INSTALL_PLA" ] && FATAL "Incompatible option: -m PLA cannot be used without --pla option"

# if develop, we force master
[ -z "$COMMIT_ID" ] && [ -n "$DEVELOP" ] && COMMIT_ID="master"

check_packages "git wget curl tar snapd"

sudo snap install jq
if [ -z "$OSM_DEVOPS" ]; then
    if [ -n "$TEST_INSTALLER" ]; then
        echo -e "\nUsing local devops repo for OSM installation"
        OSM_DEVOPS="$(dirname $(realpath $(dirname $0)))"
    else
        echo -e "\nCreating temporary dir for OSM installation"
        OSM_DEVOPS="$(mktemp -d -q --tmpdir "installosm.XXXXXX")"
        trap 'rm -rf "$OSM_DEVOPS"' EXIT

        git clone https://osm.etsi.org/gerrit/osm/devops.git $OSM_DEVOPS

        if [ -z "$COMMIT_ID" ]; then
            echo -e "\nGuessing the current stable release"
            LATEST_STABLE_DEVOPS=`git -C $OSM_DEVOPS tag -l v[0-9].* | sort -V | tail -n1`
            [ -z "$LATEST_STABLE_DEVOPS" ] && echo "Could not find the current latest stable release" && exit 0

            echo "Latest tag in devops repo: $LATEST_STABLE_DEVOPS"
            COMMIT_ID="tags/$LATEST_STABLE_DEVOPS"
        else
            echo -e "\nDEVOPS Using commit $COMMIT_ID"
        fi
        git -C $OSM_DEVOPS checkout $COMMIT_ID
    fi
fi

[ "${OSM_STACK_NAME}" == "osm" ] || OSM_DOCKER_WORK_DIR="$OSM_WORK_DIR/stack/$OSM_STACK_NAME"
OSM_K8S_WORK_DIR="$OSM_DOCKER_WORK_DIR/osm_pods" && OSM_NAMESPACE_VOL="${OSM_HOST_VOL}/${OSM_STACK_NAME}"
[ -n "$INSTALL_ONLY" ] && [ -n "$INSTALL_K8S_MONITOR" ] && install_k8s_monitoring
[ -n "$INSTALL_ONLY" ] && echo -e "\nDONE" && exit 0

#Installation starts here
wget -q -O- https://osm-download.etsi.org/ftp/osm-12.0-twelve/README.txt &> /dev/null
export OSM_TRACK_INSTALLATION_ID="$(date +%s)-$(head /dev/urandom | tr -dc A-Za-z0-9 | head -c 16)"
install_osm
echo -e "\nDONE"
exit 0