pre-deploy

#!/usr/bin/env bash
source "$PLUGIN_PATH/common/functions"
# Reset bash mode from importing the functions
set +exo pipefail
# Fail on equation failure
set -e

APP="$1"
REDIS_FLAG_PERSISTENCE_FILE="$DOKKU_ROOT/$APP/REDIS"
REDIS_CONTAINER_NAME="redis-$APP"

# Only start Redis if it is enabled
if [[ -f $REDIS_FLAG_PERSISTENCE_FILE ]]; then
    dokku_log_info1 "Starting Redis for $APP..."

    # Check if Redis container is installed
    IMAGE=$(docker images | grep "redis" | awk '{print $3}')
    if [[ -z $IMAGE ]]; then
        dokku_log_fail "Redis image not found! Did you run 'dokku plugins-install'?"
    fi

    # Check if Redis is already running
    ID=$(docker ps | grep "$REDIS_CONTAINER_NAME" | awk '{print $1}')
    if [[ ! -z $ID ]]; then
        dokku_log_verbose "Redis container already running: $REDIS_CONTAINER_NAME"
        exit 0
    fi

    # Remove old stopped container with the same name, if it exists
    ID=$(docker ps -a | grep "$REDIS_CONTAINER_NAME" | awk '{print $1}')
    if [[ ! -z $ID ]]; then
        ID=$(docker rm $ID)
        dokku_log_info1 "Removed stale Redis container $ID"
    fi

    # Check if an existing DB volume exists
    HOST_DIR="$DOKKU_ROOT/.redis/volume-$APP"
    if [[ -d $HOST_DIR ]]; then
        dokku_log_info1 "Reusing volume-$APP volume"
    else
        dokku_log_info1 "Creating new volume"
        mkdir -p $HOST_DIR
    fi
    VOLUME="$HOST_DIR:/data"

    # Launch container
    dokku_log_info1 "Starting Redis container..."
    ID=$(docker run -v $VOLUME --name $REDIS_CONTAINER_NAME -d redis redis-server --appendonly yes)

    dokku_log_info2 "Redis started:"
    dokku_log_verbose "Application: $APP"
    dokku_log_verbose "Redis: $REDIS_CONTAINER_NAME"
fi