#!/bin/sh
set -e

if [ -f /etc/os-release ]; then
    . /etc/os-release
fi

# Installs postfix, opendkim, and other required packages using the
# Alpine package manager. This function is called when the image is
# built on an Alpine base image.
do_alpine() {
    architecture_specific_packages=""
    apk update

    if [ "$(apk info postfix-pgsql | grep -R '^postfix-pgsql')" != "" ]; then
        architecture_specific_packages="${architecture_specific_packages} postfix-pgsql"
    fi
    if [ "$(apk info postfix-mysql | grep -R '^postfix-mysql')" != "" ]; then
        architecture_specific_packages="${architecture_specific_packages} postfix-mysql"
    fi

    apk add --upgrade cyrus-sasl cyrus-sasl-static cyrus-sasl-digestmd5 cyrus-sasl-crammd5 cyrus-sasl-login cyrus-sasl-ntlm libsasl
    apk add postfix postfix-pcre postfix-ldap ${architecture_specific_packages}
    apk add opendkim
    apk add --upgrade ca-certificates tzdata supervisor rsyslog musl musl-utils bash opendkim-utils libcurl jsoncpp lmdb logrotate netcat-openbsd
}


# Installs postfix, opendkim, and other required packages using the
# ubuntu/debian package manager. This function is called when the
# image is built on a ubuntu/debian base image.
do_ubuntu() {
    architecture_specific_packages=""
    RELEASE_SPECIFIC_PACKAGES=""
    export DEBCONF_NOWARNINGS=yes
    export DEBIAN_FRONTEND=noninteractive
    echo "Europe/Berlin" > /etc/timezone
    apt-get update -y -q
    
    if [ "$(apt-cache search --names-only '^postfix-pgsql$')" != "" ]; then
        architecture_specific_packages="${architecture_specific_packages} postfix-pgsql"
    fi
    if [ "$(apt-cache search --names-only '^postfix-mysql$')" != "" ]; then
        architecture_specific_packages="${architecture_specific_packages} postfix-mysql"
    fi

    apt-get install -y libsasl2-modules sasl2-bin
    apt-get install -y postfix postfix-pcre postfix-ldap ${architecture_specific_packages}
    apt-get install -y opendkim
    local libcurl="libcurl4"
    if [ "$(apt-cache search --names-only '^libcurl4t64$')" != "" ]; then
        libcurl="libcurl4t64"
    fi
    apt-get install -y ca-certificates tzdata supervisor rsyslog bash opendkim-tools curl ${libcurl} libjsoncpp25 sasl2-bin postfix-lmdb procps logrotate cron net-tools colorized-logs netcat-openbsd ${RELEASE_SPECIFIC_PACKAGES}
    apt-get clean
    rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*    
}

if [ -f /etc/alpine-release ]; then
    do_alpine
else
    do_ubuntu
fi

# Some services (eg. cron) will complain if this file does not exists, even if it's empty.
# The file is usually generated by update-locales, which is ran automatically when you do
# `apt-get install locales`. So instead of adding another package, which at the moment we
# do not need, we just create a simple empty file instead and hope to keep cron happy.
mkdir -p /etc/default/
echo "#  File generated by postfix-install.sh" > /etc/default/locale

cp -r /etc/postfix /etc/postfix.template