#!/usr/bin/env bash

set -Eeuo pipefail

umask 077


# ============================================================
# Configuration
# ============================================================

ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"

SRC="${ROOT}/stacks/zabbix"

LIVE="/srv/nfs/infra/zabbix"
ENV_FILE="${LIVE}/.env"

BACKUP_ROOT="/srv/nfs/infra/.deploy-backups/zabbix"
BACKUP_KEEP=3

STAMP="$(date '+%Y%m%d-%H%M%S')"

BACKUP_DIR="${BACKUP_ROOT}/${STAMP}"
DB_BACKUP_DIR="${BACKUP_DIR}/database"

DB_BACKUP_FILE="${DB_BACKUP_DIR}/zabbix.dump"

SERVER_START_TIMEOUT=1800
SERVER_CHECK_INTERVAL=5

WEB_START_TIMEOUT=300
WEB_CHECK_INTERVAL=5


# ============================================================
# Runtime state
# ============================================================

SERVICES_STOPPED=false
MIGRATION_STARTED=false
VERSION_CHANGED=false


# ============================================================
# Helpers
# ============================================================

log()
{
    echo
    echo "============================================================"
    echo "$*"
    echo "============================================================"
}


fail()
{
    echo
    echo "ERROR: $*" >&2
    exit 1
}


extract_version()
{
    grep -oE '[0-9]+\.[0-9]+\.[0-9]+' |
    head -n1
}


image_version()
{
    local IMAGE="$1"

    printf '%s\n' "${IMAGE}" |
    sed -nE 's/.*:alpine-([0-9]+\.[0-9]+\.[0-9]+)$/\1/p'
}


version_less_than()
{
    local A="$1"
    local B="$2"

    [[ "${A}" == "${B}" ]] && return 1

    [[ "$(
        printf '%s\n%s\n' "${A}" "${B}" |
        sort -V |
        head -n1
    )" == "${A}" ]]
}


cleanup_old_backups()
{
    echo
    echo "--- Backup retention ---"
    echo "Keeping last ${BACKUP_KEEP} pre-upgrade backups."

    mkdir -p "${BACKUP_ROOT}"

    mapfile -t BACKUPS < <(
        find "${BACKUP_ROOT}" \
            -mindepth 1 \
            -maxdepth 1 \
            -type d \
            -printf '%f\n' |
        grep -E '^[0-9]{8}-[0-9]{6}$' |
        sort -r
    )


    if (( ${#BACKUPS[@]} <= BACKUP_KEEP )); then

        echo "Current backup count: ${#BACKUPS[@]}"
        echo "Nothing to delete."

        return 0

    fi


    for BACKUP_NAME in "${BACKUPS[@]:${BACKUP_KEEP}}"
    do

        OLD_BACKUP="${BACKUP_ROOT}/${BACKUP_NAME}"

        echo
        echo "Removing old backup:"
        echo "  ${OLD_BACKUP}"

        rm -rf -- "${OLD_BACKUP}"

    done
}


restore_old_services()
{
    echo
    echo "--- Restore previous Zabbix services ---"

    if [[ -f "${BACKUP_DIR}/docker-compose.yml" ]]; then

        cp \
            "${BACKUP_DIR}/docker-compose.yml" \
            "${LIVE}/docker-compose.yml"

    fi


    (
        cd "${LIVE}"

        docker compose \
            --env-file "${ENV_FILE}" \
            up -d \
            zabbix-server \
            zabbix-web
    ) || true
}


on_error()
{
    rc=$?

    trap - ERR

    echo
    echo "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"
    echo " Zabbix deployment FAILED"
    echo "!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"


    if [[ -d "${BACKUP_DIR}" ]]; then

        echo
        echo "Pre-upgrade backup:"
        echo "  ${BACKUP_DIR}"

    fi


    #
    # До старта нового zabbix-server схема БД точно
    # не могла измениться.
    #
    # Поэтому старую версию можно безопасно вернуть.
    #

    if [[ "${SERVICES_STOPPED}" == "true" ]] &&
       [[ "${MIGRATION_STARTED}" != "true" ]]
    then

        echo
        echo "Database migration has NOT started."
        echo "Restoring previous containers."

        restore_old_services

    else

        echo
        echo "Automatic rollback is NOT performed."

        if [[ "${MIGRATION_STARTED}" == "true" ]]; then

            echo
            echo "Reason:"
            echo "  new Zabbix server has already been started;"
            echo "  database schema migration may have begun."
            echo
            echo "Rollback requires restoration of the"
            echo "pre-upgrade PostgreSQL dump."

        fi

    fi


    exit "${rc}"
}


wait_for_zabbix_server()
{
    local elapsed=0

    echo
    echo "Waiting for Zabbix server startup..."


    while (( elapsed < SERVER_START_TIMEOUT ))
    do

        RUNNING="$(
            docker inspect \
                -f '{{.State.Running}}' \
                zabbix-server-pgsql 2>/dev/null ||
            echo false
        )"


        if [[ "${RUNNING}" != "true" ]]; then

            echo
            echo "--- Zabbix server logs ---"

            docker logs \
                --since "${UPGRADE_STARTED}" \
                zabbix-server-pgsql || true

            fail "Zabbix server container stopped during startup"

        fi


        SERVER_LOG="$(
            docker logs \
                --since "${UPGRADE_STARTED}" \
                zabbix-server-pgsql 2>&1 || true
        )"


        #
        # Successful server start means mandatory DB schema
        # is compatible. Zabbix does not start if required
        # patches failed.
        #

        if echo "${SERVER_LOG}" |
           grep -q 'server #0 started \[main process\]'
        then

            echo
            echo "Zabbix server main process started."

            return 0

        fi


        if echo "${SERVER_LOG}" |
           grep -Eqi \
           'database upgrade.*(failed|failure)|cannot upgrade database|database version.*newer'
        then

            echo "${SERVER_LOG}"

            fail "Zabbix database upgrade failed"

        fi


        sleep "${SERVER_CHECK_INTERVAL}"

        elapsed=$((elapsed + SERVER_CHECK_INTERVAL))

        echo "Waiting... ${elapsed}s"

    done


    echo
    echo "--- Zabbix server logs ---"

    docker logs \
        --since "${UPGRADE_STARTED}" \
        zabbix-server-pgsql || true


    fail \
        "Timeout waiting for Zabbix server after ${SERVER_START_TIMEOUT}s"
}


wait_for_zabbix_web()
{
    local elapsed=0

    echo
    echo "Waiting for Zabbix web health=healthy..."


    while (( elapsed < WEB_START_TIMEOUT ))
    do

        RUNNING="$(
            docker inspect \
                -f '{{.State.Running}}' \
                zabbix-web-nginx-pgsql 2>/dev/null ||
            echo false
        )"


        if [[ "${RUNNING}" != "true" ]]; then

            echo
            echo "--- Zabbix web logs ---"

            docker logs \
                zabbix-web-nginx-pgsql || true

            fail "Zabbix web container stopped"

        fi


        HEALTH="$(
            docker inspect \
                -f '{{if .State.Health}}{{.State.Health.Status}}{{else}}none{{end}}' \
                zabbix-web-nginx-pgsql
        )"


        echo "Zabbix web health: ${HEALTH} (${elapsed}s)"


        if [[ "${HEALTH}" == "healthy" ]]; then

            return 0

        fi


        sleep "${WEB_CHECK_INTERVAL}"

        elapsed=$((elapsed + WEB_CHECK_INTERVAL))

    done


    docker logs \
        zabbix-web-nginx-pgsql || true


    fail \
        "Timeout waiting for Zabbix web health=healthy"
}


trap on_error ERR


# ============================================================
# Required commands
# ============================================================

log "Pre-flight checks"

for CMD in \
    docker \
    psql \
    pg_dump \
    pg_restore \
    sha256sum \
    grep \
    sed \
    sort \
    find \
    awk
do

    command -v "${CMD}" >/dev/null 2>&1 || \
        fail "Required command not found: ${CMD}"

done


docker compose version >/dev/null 2>&1 || \
    fail "Docker Compose plugin is not available"


# ============================================================
# Required files
# ============================================================

[[ -f "${SRC}/docker-compose.yml" ]] || \
    fail "${SRC}/docker-compose.yml not found"

[[ -f "${LIVE}/docker-compose.yml" ]] || \
    fail "${LIVE}/docker-compose.yml not found"

[[ -f "${ENV_FILE}" ]] || \
    fail "${ENV_FILE} not found"


# ============================================================
# Backup directory
# ============================================================

mkdir -p "${BACKUP_ROOT}"

[[ -w "${BACKUP_ROOT}" ]] || \
    fail "${BACKUP_ROOT} is not writable"


# ============================================================
# Load production environment
#
# .env must be shell compatible.
# ============================================================

set -a

# shellcheck disable=SC1090
source "${ENV_FILE}"

set +a



DB_HOST="${DB_SERVER_HOST:-${POSTGRES_HOST:-}}"
DB_PORT="${DB_SERVER_PORT:-${POSTGRES_PORT:-5432}}"
DB_NAME="${POSTGRES_DB:-}"
DB_USER="${POSTGRES_USER:-}"
DB_PASSWORD="${POSTGRES_PASSWORD:-}"


: "${DB_HOST:?DB_SERVER_HOST not defined}"
: "${DB_PORT:?DB_SERVER_PORT not defined}"
: "${DB_NAME:?POSTGRES_DB not defined}"
: "${DB_USER:?POSTGRES_USER not defined}"
: "${DB_PASSWORD:?POSTGRES_PASSWORD not defined}"

export PGPASSWORD="${POSTGRES_PASSWORD}"
export PGCONNECT_TIMEOUT=10


# ============================================================
# Validate Compose
# ============================================================

log "Validate Docker Compose"

docker compose \
    --env-file "${ENV_FILE}" \
    -f "${SRC}/docker-compose.yml" \
    config >/dev/null


echo "Docker Compose configuration is valid."


# ============================================================
# Detect target images
# ============================================================

log "Detect target Zabbix images"


NEW_SERVER_IMAGE="$(
    docker compose \
        --env-file "${ENV_FILE}" \
        -f "${SRC}/docker-compose.yml" \
        config --images |
    grep -m1 'zabbix/zabbix-server-pgsql:'
)"


NEW_WEB_IMAGE="$(
    docker compose \
        --env-file "${ENV_FILE}" \
        -f "${SRC}/docker-compose.yml" \
        config --images |
    grep -m1 'zabbix/zabbix-web-nginx-pgsql:'
)"


[[ -n "${NEW_SERVER_IMAGE}" ]] || \
    fail "Could not detect target Zabbix server image"


[[ -n "${NEW_WEB_IMAGE}" ]] || \
    fail "Could not detect target Zabbix web image"


TARGET_SERVER_VERSION="$(
    image_version "${NEW_SERVER_IMAGE}"
)"


TARGET_WEB_VERSION="$(
    image_version "${NEW_WEB_IMAGE}"
)"


[[ -n "${TARGET_SERVER_VERSION}" ]] || \
    fail \
        "Zabbix server must use a pinned alpine-X.Y.Z tag"


[[ -n "${TARGET_WEB_VERSION}" ]] || \
    fail \
        "Zabbix web must use a pinned alpine-X.Y.Z tag"


[[ "${TARGET_SERVER_VERSION}" == "${TARGET_WEB_VERSION}" ]] || \
    fail \
        "Zabbix server/web versions differ: ${TARGET_SERVER_VERSION} != ${TARGET_WEB_VERSION}"


TARGET_VERSION="${TARGET_SERVER_VERSION}"


echo "Target server image:"
echo "  ${NEW_SERVER_IMAGE}"

echo
echo "Target web image:"
echo "  ${NEW_WEB_IMAGE}"

echo
echo "Target Zabbix version:"
echo "  ${TARGET_VERSION}"


# ============================================================
# Current containers
# ============================================================

docker inspect zabbix-server-pgsql >/dev/null 2>&1 || \
    fail "Current Zabbix server container does not exist"


docker inspect zabbix-web-nginx-pgsql >/dev/null 2>&1 || \
    fail "Current Zabbix web container does not exist"


SERVER_RUNNING="$(
    docker inspect \
        -f '{{.State.Running}}' \
        zabbix-server-pgsql
)"


WEB_RUNNING="$(
    docker inspect \
        -f '{{.State.Running}}' \
        zabbix-web-nginx-pgsql
)"


[[ "${SERVER_RUNNING}" == "true" ]] || \
    fail "Current Zabbix server is not running"


[[ "${WEB_RUNNING}" == "true" ]] || \
    fail "Current Zabbix web is not running"


# ============================================================
# Current actual Zabbix version
# ============================================================

log "Detect current Zabbix version"


CURRENT_VERSION_OUTPUT="$(
    docker exec \
        zabbix-server-pgsql \
        zabbix_server \
        -V
)"


CURRENT_VERSION="$(
    printf '%s\n' "${CURRENT_VERSION_OUTPUT}" |
    extract_version
)"


[[ -n "${CURRENT_VERSION}" ]] || \
    fail "Could not determine current Zabbix version"


OLD_SERVER_IMAGE="$(
    docker inspect \
        -f '{{.Config.Image}}' \
        zabbix-server-pgsql
)"


OLD_WEB_IMAGE="$(
    docker inspect \
        -f '{{.Config.Image}}' \
        zabbix-web-nginx-pgsql
)"


echo "Current Zabbix version:"
echo "  ${CURRENT_VERSION}"

echo
echo "Current server image:"
echo "  ${OLD_SERVER_IMAGE}"

echo
echo "Current web image:"
echo "  ${OLD_WEB_IMAGE}"


# ============================================================
# Version validation
# ============================================================

log "Validate version transition"


if version_less_than \
    "${TARGET_VERSION}" \
    "${CURRENT_VERSION}"
then

    fail \
        "Zabbix downgrade is not allowed: ${CURRENT_VERSION} -> ${TARGET_VERSION}"

fi


if [[ "${CURRENT_VERSION}" != "${TARGET_VERSION}" ]]
then

    VERSION_CHANGED=true

fi


echo "Current version: ${CURRENT_VERSION}"
echo "Target version:  ${TARGET_VERSION}"
echo "Version changed: ${VERSION_CHANGED}"


# ============================================================
# Pull target images before downtime
# ============================================================

log "Pull target Docker images"


docker pull "${NEW_SERVER_IMAGE}"
docker pull "${NEW_WEB_IMAGE}"


# ============================================================
# VERSION UPDATE
# ============================================================

if [[ "${VERSION_CHANGED}" == "true" ]]
then

    # ========================================================
    # Prepare backup directory before shutdown
    # ========================================================

    log "Prepare Zabbix pre-upgrade backup"


    mkdir -p "${DB_BACKUP_DIR}"


    cp \
        "${LIVE}/docker-compose.yml" \
        "${BACKUP_DIR}/docker-compose.yml"


    cat > "${BACKUP_DIR}/metadata.txt" <<EOF
timestamp=${STAMP}

current_version=${CURRENT_VERSION}
target_version=${TARGET_VERSION}

current_server_image=${OLD_SERVER_IMAGE}
target_server_image=${NEW_SERVER_IMAGE}

current_web_image=${OLD_WEB_IMAGE}
target_web_image=${NEW_WEB_IMAGE}

postgres_host=${DB_HOST}
postgres_port=${DB_PORT}
postgres_database=${POSTGRES_DB}
postgres_user=${POSTGRES_USER}
EOF


    # ========================================================
    # Stop application writes before DB backup
    #
    # Official Zabbix upgrade procedure requires stopping
    # server before database backup.
    # Web is also stopped to prevent configuration writes.
    # ========================================================

    log "Stop Zabbix before database backup"


    cd "${LIVE}"


    docker compose \
        --env-file "${ENV_FILE}" \
        stop \
        zabbix-web \
        zabbix-server


    SERVICES_STOPPED=true


    # ========================================================
    # DB connection test
    # ========================================================

    log "Test PostgreSQL connection"


    DB_TEST="$(
        psql \
            -h "${DB_HOST}" \
            -p "${DB_PORT}" \
            -U "${POSTGRES_USER}" \
            -d "${POSTGRES_DB}" \
            -Atqc 'SELECT 1;'
    )"


    [[ "${DB_TEST}" == "1" ]] || \
        fail "Cannot connect to PostgreSQL"


    # ========================================================
    # PostgreSQL versions
    # ========================================================

    SERVER_VERSION="$(
        psql \
            -h "${DB_HOST}" \
            -p "${DB_PORT}" \
            -U "${POSTGRES_USER}" \
            -d "${POSTGRES_DB}" \
            -Atqc 'SHOW server_version;'
    )"


    echo "${SERVER_VERSION}" \
        > "${DB_BACKUP_DIR}/postgresql-version.txt"


    SERVER_MAJOR="${SERVER_VERSION%%.*}"


    PG_DUMP_VERSION="$(
        pg_dump --version |
        sed -E 's/.* ([0-9]+(\.[0-9]+)?).*/\1/'
    )"


    PG_DUMP_MAJOR="${PG_DUMP_VERSION%%.*}"


    echo "PostgreSQL server:"
    echo "  ${SERVER_VERSION}"

    echo "pg_dump client:"
    echo "  ${PG_DUMP_VERSION}"


    if (( PG_DUMP_MAJOR < SERVER_MAJOR ))
    then

        fail \
            "pg_dump ${PG_DUMP_VERSION} is older than PostgreSQL server ${SERVER_VERSION}"

    fi


    # ========================================================
    # DB size
    # ========================================================

    DB_SIZE="$(
        psql \
            -h "${DB_HOST}" \
            -p "${DB_PORT}" \
            -U "${POSTGRES_USER}" \
            -d "${POSTGRES_DB}" \
            -Atqc \
            'SELECT pg_size_pretty(pg_database_size(current_database()));'
    )"


    echo "Database size:"
    echo "  ${DB_SIZE}"


    # ========================================================
    # pg_dump
    # ========================================================

    log "Create PostgreSQL backup"


    pg_dump \
        -h "${DB_HOST}" \
        -p "${DB_PORT}" \
        -U "${POSTGRES_USER}" \
        -d "${POSTGRES_DB}" \
        --format=custom \
        --no-owner \
        --no-privileges \
        --file="${DB_BACKUP_FILE}"


    [[ -s "${DB_BACKUP_FILE}" ]] || \
        fail "PostgreSQL dump does not exist or is empty"


    # ========================================================
    # Validate dump
    # ========================================================

    log "Validate PostgreSQL backup"


    pg_restore \
        --list \
        "${DB_BACKUP_FILE}" \
        > "${DB_BACKUP_DIR}/zabbix.dump.list"


    [[ -s "${DB_BACKUP_DIR}/zabbix.dump.list" ]] || \
        fail "pg_restore could not validate dump"


    # ========================================================
    # SHA256
    # ========================================================

    (
        cd "${DB_BACKUP_DIR}"

        sha256sum \
            zabbix.dump \
            > zabbix.dump.sha256

        sha256sum \
            -c zabbix.dump.sha256
    )


    DB_BACKUP_SIZE="$(
        du -h "${DB_BACKUP_FILE}" |
        awk '{print $1}'
    )"


    echo
    echo "PostgreSQL backup successful."

    echo
    echo "Backup:"
    echo "  ${DB_BACKUP_FILE}"

    echo
    echo "Dump size:"
    echo "  ${DB_BACKUP_SIZE}"


    # ========================================================
    # Retention
    # ========================================================

    cleanup_old_backups


    # ========================================================
    # Deploy new Compose
    # ========================================================

    log "Deploy new docker-compose.yml"


    cp \
        "${SRC}/docker-compose.yml" \
        "${LIVE}/docker-compose.yml"


    cd "${LIVE}"


    # ========================================================
    # Start NEW server only
    #
    # From this point DB migration may start.
    # No automatic rollback after this flag.
    # ========================================================

    log "Start new Zabbix server"


    UPGRADE_STARTED="$(
        date -u '+%Y-%m-%dT%H:%M:%SZ'
    )"


    MIGRATION_STARTED=true


    docker compose \
        --env-file "${ENV_FILE}" \
        up -d \
        --no-deps \
        zabbix-server


    # ========================================================
    # Wait for automatic DB schema upgrade + server startup
    # ========================================================

    log "Wait for Zabbix database upgrade and server startup"


    wait_for_zabbix_server


    # ========================================================
    # Upgrade log
    # ========================================================

    SERVER_LOG="$(
        docker logs \
            --since "${UPGRADE_STARTED}" \
            zabbix-server-pgsql 2>&1
    )"


    echo
    echo "--- Zabbix server startup log ---"
    echo "${SERVER_LOG}"


    if echo "${SERVER_LOG}" |
       grep -q 'database upgrade fully completed'
    then

        echo
        echo "Database schema upgrade:"
        echo "  fully completed"

    else

        echo
        echo "Database schema upgrade marker:"
        echo "  not present"
        echo
        echo "This is normal when the target release"
        echo "does not require a schema change."

    fi


    # ========================================================
    # Verify new server version
    # ========================================================

    log "Validate Zabbix server version"


    RUNNING_VERSION_OUTPUT="$(
        docker exec \
            zabbix-server-pgsql \
            zabbix_server \
            -V
    )"


    RUNNING_VERSION="$(
        printf '%s\n' "${RUNNING_VERSION_OUTPUT}" |
        extract_version
    )"


    [[ "${RUNNING_VERSION}" == "${TARGET_VERSION}" ]] || \
        fail \
            "Running Zabbix version ${RUNNING_VERSION} does not match ${TARGET_VERSION}"


    # ========================================================
    # Start web after server/DB upgrade is complete
    # ========================================================

    log "Start Zabbix web"


    docker compose \
        --env-file "${ENV_FILE}" \
        up -d \
        --no-deps \
        zabbix-web


    wait_for_zabbix_web


# ============================================================
# NO VERSION CHANGE
# ============================================================

else

    log "No Zabbix version change"


    cp \
        "${SRC}/docker-compose.yml" \
        "${LIVE}/docker-compose.yml"


    cd "${LIVE}"


    docker compose \
        --env-file "${ENV_FILE}" \
        pull


    docker compose \
        --env-file "${ENV_FILE}" \
        up -d \
        --remove-orphans


    UPGRADE_STARTED="$(
        date -u -d '10 minutes ago' '+%Y-%m-%dT%H:%M:%SZ'
    )"


    wait_for_zabbix_server
    wait_for_zabbix_web

fi


# ============================================================
# Final server state
# ============================================================

log "Final Zabbix server checks"


SERVER_RUNNING="$(
    docker inspect \
        -f '{{.State.Running}}' \
        zabbix-server-pgsql
)"


[[ "${SERVER_RUNNING}" == "true" ]] || \
    fail "Zabbix server is not running"


FINAL_VERSION_OUTPUT="$(
    docker exec \
        zabbix-server-pgsql \
        zabbix_server \
        -V
)"


FINAL_VERSION="$(
    printf '%s\n' "${FINAL_VERSION_OUTPUT}" |
    extract_version
)"


[[ "${FINAL_VERSION}" == "${TARGET_VERSION}" ]] || \
    fail \
        "Final Zabbix version mismatch: ${FINAL_VERSION} != ${TARGET_VERSION}"


# ============================================================
# Final web state
# ============================================================

WEB_RUNNING="$(
    docker inspect \
        -f '{{.State.Running}}' \
        zabbix-web-nginx-pgsql
)"


WEB_HEALTH="$(
    docker inspect \
        -f '{{if .State.Health}}{{.State.Health.Status}}{{else}}none{{end}}' \
        zabbix-web-nginx-pgsql
)"


[[ "${WEB_RUNNING}" == "true" ]] || \
    fail "Zabbix web is not running"


[[ "${WEB_HEALTH}" == "healthy" ]] || \
    fail "Zabbix web is not healthy"


# ============================================================
# Running images
# ============================================================

RUNNING_SERVER_IMAGE="$(
    docker inspect \
        -f '{{.Config.Image}}' \
        zabbix-server-pgsql
)"


RUNNING_WEB_IMAGE="$(
    docker inspect \
        -f '{{.Config.Image}}' \
        zabbix-web-nginx-pgsql
)"


# ============================================================
# Success
# ============================================================

log "Zabbix deployment successful"


echo "Previous Zabbix version:"
echo "  ${CURRENT_VERSION}"

echo
echo "Running Zabbix version:"
echo "  ${FINAL_VERSION}"

echo
echo "Server image:"
echo "  ${RUNNING_SERVER_IMAGE}"

echo
echo "Web image:"
echo "  ${RUNNING_WEB_IMAGE}"

echo
echo "Web health:"
echo "  ${WEB_HEALTH}"


if [[ "${VERSION_CHANGED}" == "true" ]]
then

    echo
    echo "Pre-upgrade backup:"
    echo "  ${BACKUP_DIR}"

    echo
    echo "PostgreSQL dump:"
    echo "  ${DB_BACKUP_FILE}"

    echo
    echo "Backup retention:"
    echo "  last ${BACKUP_KEEP} backups"

fi


# ============================================================
# Clear credentials
# ============================================================

unset PGPASSWORD
unset POSTGRES_PASSWORD