Dump from a PG database, using Docker to use the exact version

dump.sh

#!/bin/bash

# Function to check if an environment variable is set
check_env_variable() {
    local var_name="$1"
    local var_desc="$2"

    if [ -z "${!var_name}" ]; then
        echo "Error: '${var_name}' environment variable is not set. Please set it to ${var_desc}."
        exit 1
    fi
}

# Check required environment variables
check_env_variable "PG_VERSION" "specify the PostgreSQL version"
check_env_variable "DB_USER" "specify the database user"
check_env_variable "DB_PASSWORD" "specify the database password"
check_env_variable "DB_HOST" "specify the database host"
check_env_variable "DB_PORT" "specify the database port"
check_env_variable "DB_NAME" "specify the database name"

# Get current user's ID and group ID
CURRENT_UID=$(id -u)
CURRENT_GID=$(id -g)

# Define timestamp format
TIMESTAMP=$(date +"%Y%m%d_%H%M%S")

# Run the PostgreSQL container to dump the database
docker run \
    --rm \
    --volume=$(pwd):/host \
    -e PGPASSWORD="$DB_PASSWORD" \
    -e CURRENT_UID="$CURRENT_UID" \
    -e CURRENT_GID="$CURRENT_GID" \
    --user="$CURRENT_UID:$CURRENT_GID" \
    --network host \
    postgres:${PG_VERSION} \
    pg_dump -v -U "$DB_USER" -h "$DB_HOST" -p "$DB_PORT" -d "$DB_NAME" -Fc -f "/host/dump_${TIMESTAMP}.dump"