This is a custom entrypoint for an php:7.1-apache image, it might work in a similar way with other base images but it has not been tested # # what it does # - it parses a parameters file *CONFIG_FILE* of your project an looks for variable placeholders # - it checks if any _FILE appended environment variables exist, if so it puts the content of t…

entrypoint.sh

#!/bin/bash
# Maintainer Steve Seidenthal <steve.seidenthal@gmail.com>
#
# This is a custom entrypoint for an php:7.1-apache image, it might work in a similar way with other base images but it
# has not been tested
#
# what it does
# - it parses a parameters file *CONFIG_FILE* of your project an looks for variable placeholders
# - it checks if any _FILE appended environment variables exist, if so it puts the content of the file in the variable
# - it makes sure all needed variables (as defined in CONFIG_FILE) exist
# - it prevents the container to start if any needed variable is unset
#
# **** PLEASE SCROLL DOWN TO CONFIG_FILE, IGNORE ALL ABOVE AN DO NOT CHANGE ****

set -euo pipefail

export ERRORS=0

# - looking for environment variables in CONFIG_FILE such as {{MY_VARIABLE}}
# - DO NOT TOUCH !
parse_placeholders() {
    variables=(`tail $CONFIG_FILE | grep -oh "{{.*}}"`)

    for variable in "${variables[@]}"
    do
        name=(`echo $variable | sed 's/}//g' | sed 's/{//g'`)
        analyze_environment_variables    "$name"
    done

    if [ ${ERRORS} -eq 1 ]; then
        echo "*********************************************************************************"
        echo "you are using environment variables which are not set ! please see the above list"
        echo "*********************************************************************************"
        exit
    fi
}

# - parsing _FILE variable and ensuring environment variables exist
# - DO NOT TOUCH !
analyze_environment_variables() {
	local var="$1"
	local fileVar="${var}_FILE"
	local def="${2:-}"

	if [ "${!var:-}" ] && [ "${!fileVar:-}" ]; then
		echo >&2 "error: both $var and $fileVar are set (but are exclusive)"
		exit 1
	fi

	local val="$def"
    local type="env"

	if [ "${!var:-}" ]; then
		val="${!var}"
	elif [ "${!fileVar:-}" ]; then
	    local type="secret"
		val="$(< "${!fileVar}")"
	fi

    export "$var"="$val"
    unset "$fileVar"

    if [ -z "${!var:-}" ]
    then
        export ERRORS=1
        echo " - $var has not been found"
    else
        echo " - $var found as $type"
    fi
}

# - specify the CONFIG_FILE file in which variables should be replaced, syntax for a variable is {{MY_VARIABLE_NAME}}
CONFIG_FILE='/var/www/html/config/parameters.php'

# - make sure all variables defined in CONFIG_FILE exist as environment variable
# - parsing _FILE variables, typically secrets
# - DO NOT TOUCH !
parse_placeholders

# - use sed to replace the placeholders inside your configuration file by the actual content of the variable
# - you need to adapt these lines to your needs
sed -i -e "s@{{UPLOAD_FOLDER}}@${UPLOAD_FOLDER}@g" ${CONFIG_FILE}
sed -i -e "s@{{DATABASE_NAME}}@${DATABASE_NAME}@g" ${CONFIG_FILE}
sed -i -e "s@{{DATABASE_PORT}}@${DATABASE_PORT}@g" ${CONFIG_FILE}
sed -i -e "s@{{DATABASE_HOST}}@${DATABASE_HOST}@g" ${CONFIG_FILE}
sed -i -e "s@{{DATABASE_USERNAME}}@${DATABASE_USERNAME}@g" ${CONFIG_FILE}
sed -i -e "s@{{DATABASE_PASSWORD}}@${DATABASE_PASSWORD}@g" ${CONFIG_FILE}

# - starting apache process
# - DO NOT TOUCH !
docker-php-entrypoint
apache2-foreground
exec "$@"