#!/bin/sh
#
#  php5enmod - a php5 module manager for Debian
#
#  Copyright 2012 Canonical Ltd., All Rights Reserved.
#
#  This program is free software: you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation, either version 3 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  On Debian systems the full text of the GPL version 3 is available at
#  /usr/share/common-licenses/GPL-3.
#
set -ue

SCRIPT_NAME=${0##*/}
ENABLED=0
DISABLED=0
VERBOSE=no

cleanup() {
    if [ "${VERBOSE}" != "no" ]; then
	if [ ${ENABLED} -gt 0 ] ; then
            echo "Enabled ${ENABLED} module(s), you may need to restart any running PHP processes."
	fi
	if [ ${DISABLED} -gt 0 ] ; then
            echo "Disabled ${DISABLED} module(s), you may need to restart any running PHP processes."
	fi
    fi
}

trap cleanup EXIT

usage() {
    echo "usage: ${SCRIPT_NAME} module_name [ module_name_2 ]"
    exit 1
}

error() {
    echo "ERROR: ${1}" >&2
    shift
    local ecode=${1:-1}
    exit ${ecode}
}

enmods() {
    local modname=""
    ENABLED=0
    for modname in ${@} ; do
        enmod ${modname}
    done
}

dismods() {
    DISABLED=0
    local modname=""
    for modname in ${@} ; do
        dismod "${modname}"
    done
}

enmod() {
    local modname="$(basename "${1%/[0-9]*}")"
    local priority="$(basename "${1#[a-z]*/}")"
    [ "${modname}" = "${priority}" ] && priority=20
    # assert $modname is in /etc/php5/mods-available
    local source_ini="/etc/php5/mods-available/${modname}.ini"
    [ -e "${source_ini}" ] || error "${source_ini} does not exist" 2
    [ -z "${priority}" ] && priority=20
        
    # assert $modname is not present in /etc/php5/conf.d, or already symlink to /etc/php5/mods-available
    local live_link="/etc/php5/conf.d/$priority-$modname.ini"
    local live_link_content="../mods-available/$modname.ini"
    if [ -e "${live_link}" ] ; then
        if [ -h "${live_link}" ] ; then
            local content="$(readlink "${live_link}")"
            if [ "${content}" = "${live_link_content}" ] ; then
                return
            fi
        fi
        error "${modname} module symlink already exists in /etc/php5/conf.d with different content"
    fi
    ln -s "${live_link_content}" "${live_link}"
    ENABLED=$((${ENABLED}+1))
}

dismod() {
    local modname="$(basename "${1%/[0-9]*}")"
    local live_link=""
    local live_link_content="../mods-available/${modname}.ini"
    local FOUND=0
    for live_link in $(ls -1 /etc/php5/conf.d/*.ini); do
        # assert $modname is in /etc/php5/conf.d
	[ -h "${live_link}" ] || continue
        # assert $modname is a symlink to /etc/php5/mods-available
	[ "$(readlink "${live_link}")" != "${live_link_content}" ] && continue
	[ -e "${live_link}" ] || echo "removing dangling symlink ${live_link}"
	# remove the symlink
	rm -f "${live_link}"
	FOUND=1
    done
    if [ "${FOUND}" -gt 0 ]; then
	DISABLED=$(($DISABLED+1))
    else
	if [ -e /etc/php5/mods-available/${modname}.ini ]; then
		echo "$modname module already disabled"
	else
		echo "$modname module does not exist!"
	fi
    fi
}

# parse args
# modname
[ -n ${1:-""} ] || usage

case "${SCRIPT_NAME}" in
php5enmod)
    enmods $@
    ;;
php5dismod)
    dismods $@
    ;;
*)
    usage
    ;;
esac
exit 0