#!/bin/sh

set -e

[ "$DEBIAN_SCRIPT_DEBUG" ] && set -vx

case "$1" in
	configure)
	# continue below
	;;

	abort-upgrade|abort-remove|abort-deconfigure)
	exit 0
	;;

	*)
	echo "postinst called with unknown argument \`$1'" >&2
	exit 0
	;;
esac


# Load debconf
. /usr/share/debconf/confmodule

# Include CARNet functions
. /usr/share/carnet-tools/functions.sh

PKG="php5-cn"
A2MODEDIR="/etc/apache2/mods-enabled"
EXTENSIONS="mysql"
PHP5DIR="/etc/php5"
PHP5CONFD="/etc/php5/conf.d"

need_restart=0


# phpmemlimit ()
#
#   Calculate memory size for PHP memory_limit option.
#
phpmemlimit () {

    local memtotal memlimit
    memtotal=`awk 'tolower($1) == "memtotal:" { printf("%i", $2/1024); }' /proc/meminfo`

    if [ $memtotal -lt 512 ]; then memlimit=16; fi
    if [ $memtotal -ge 512 ]; then memlimit=32; fi
    if [ $memtotal -gt 1024 ]; then memlimit=64; fi

    echo $memlimit
}


# Disable PHP4 module and enable Apache2 PHP5 module.
#
if [ -e /etc/apache2/apache2.conf ]; then
	if [ -e "$A2MODEDIR/php4.load" ]; then
		cp_echo "CN: Disabling PHP4 module for Apache2 web server"
		a2dismod php4 >/dev/null || true
		need_restart=1
	fi
	if [ ! -e "$A2MODEDIR/php5.load" ] || [ ! -e "$A2MODEDIR/php5.conf" ]; then
		cp_echo "CN: Enabling PHP5 module for Apache2 web server"
		a2enmod php5 >/dev/null || true
		need_restart=1
	fi
fi


# Check for PHP5 SAPI directories and configuration files.
#
for SAPI in apache2 cli; do

        if [ ! -d "$PHP5DIR/$SAPI" ]; then
                cp_echo "CN: Creating configuration directory $PHP5DIR/$SAPI/"
                mkdir -p $PHP5DIR/$SAPI/
        fi

        ini_file="$PHP5DIR/$SAPI/php.ini"

        if [ ! -f "$ini_file" ]; then

                cp_echo "CN: Generating configuration file $ini_file"

                ini_file_tmp=`mktemp $ini_file.tmp.XXXXXX`
                if [ "$SAPI" = "cli" ]; then
                    if [ -f "/usr/share/php5/php.ini-dist.cli" ]; then
                        cat /usr/share/php5/php.ini-dist.cli > $ini_file_tmp
                    fi
                else
                    if [ -f "/usr/share/php5/php.ini-dist" ]; then
                        cat /usr/share/php5/php.ini-dist > $ini_file_tmp
                    fi
                fi
                cp_mv $ini_file_tmp $ini_file
                need_restart=1
        fi
done


# Check for /etc/php5/conf.d/ directory.
#
if [ ! -d "$PHP5CONFD" ]; then
        cp_echo "CN: Creating configuration directory $PHP5CONFD"
        mkdir -p $PHP5CONFD/
fi


# Check if PHP5 extensions are enabled.
#
for php5ext in $EXTENSIONS; do

        php5ext_re="^[[:space:]]*extension[[:space:]]*=[[:space:]]*$php5ext\.so"

	# Remove extension entry from /etc/php5/(apache2|cli).ini
	# configuration files.
        for SAPI in apache2 cli; do

            	ini_file="$PHP5DIR/$SAPI/php.ini"

        	if [ -f "$ini_file" ]; then

			cp_echo "CN: Removing $php5ext extension from file $ini_file"

			cp_check_and_sed "$php5ext_re" \
				"/$php5ext_re/d" \
				"$ini_file" && need_restart=1 || true
    		fi
        done

	# Check extension configuration in /etc/php5/conf.d/ directory.
	if [ ! -f "$PHP5CONFD/$php5ext.ini" ]; then

		cp_echo "CN: Creating configuration file $PHP5CONFD/$php5ext.ini"
		
		php5ext_up=`echo $php5ext | tr [:lower:] [:upper:] | sed 's/Y/y/'`
		INITMP=`mktemp $PHP5CONFD/$php5ext.ini.tmp.XXXXXX`

		cp_echo "CN: Adding $php5ext extension to file $PHP5CONFD/$php5ext.ini"
		
		echo -e "# configuration for php $php5ext_up module\nextension=$php5ext.so" >> "$INITMP"
		cp_mv "$INITMP" "$PHP5CONFD/$php5ext.ini"
		
		need_restart=1
	else

		if ! grep -q "$php5ext_re" "$PHP5CONFD/$php5ext.ini"; then

			cp_echo "CN: Adding $php5ext extension to file $PHP5CONFD/$php5ext.ini"
			
			INITMP=`mktemp $PHP5CONFD/$php5ext.ini.tmp.XXXXXX`
			cat "$PHP5CONFD/$php5ext.ini" > "$INITMP"
			echo "extension=$php5ext.so" >> "$INITMP"
			cp_mv "$INITMP" "$PHP5CONFD/$php5ext.ini"
			
			need_restart=1
		fi
	fi
done


# Enable some PHP5 tweaks for Apache2 web server (/etc/php5/apache2/php.ini).
#
#   * upload_max_filesize = 256M
#   * post_max_size, memory_limit = depends on system memory, we are using
#     phpmemlimit() function.
#
for SAPI in apache2 cli; do

	if [ ! -d "$PHP5DIR/$SAPI" ]; then
		continue
	fi
	
	db_get php5-cn/${SAPI} || true
	if [ "$RET" = "true" ]; then

	    ini_file="$PHP5DIR/$SAPI/php.ini"

	    cp_echo "CN: Checking and enabling some specific parameters in file $ini_file"
	    
	    phplimit="$(phpmemlimit)M"
	
    	    if [ -f "$ini_file" ]; then

		cp_check_and_sed "^[[:space:]]*upload_max_filesize[[:space:]]*=" \
			's/^[[:space:]]*upload_max_filesize[[:space:]]*=.*/upload_max_filesize = 256M/' \
			"$ini_file" && need_restart=1 || true

		cp_check_and_sed "^[[:space:]]*post_max_size[[:space:]]*=" \
			"s/^[[:space:]]*post_max_size[[:space:]]*=.*/post_max_size = ${phplimit}/" \
			"$ini_file" && need_restart=1 || true

		cp_check_and_sed "^[[:space:]]*memory_limit[[:space:]]*=" \
			"s/^[[:space:]]*memory_limit[[:space:]]*=.*/memory_limit = ${phplimit}/" \
			"$ini_file" && need_restart=1 || true
    	    fi
		
	    ini_file_tmp=`mktemp $ini_file.tmp.XXXXXX`
	    if [ -f "$ini_file" ]; then
		cat $ini_file > $ini_file_tmp
	    fi

	    if ! egrep -q "^[[:space:]]*upload_max_filesize[[:space:]]*=" $ini_file_tmp; then
		echo "upload_max_filesize = 256M" >> "$ini_file_tmp"
		need_restart=1
	    fi
	    if ! egrep -q "^[[:space:]]*post_max_size[[:space:]]*=" $ini_file_tmp; then
		echo "post_max_size = ${phplimit}" >> "$ini_file_tmp"
		need_restart=1
	    fi
	    if ! egrep -q "^[[:space:]]*memory_limit[[:space:]]*=" $ini_file_tmp; then
		echo "memory_limit = ${phplimit}" >> "$ini_file_tmp"
		need_restart=1
	    fi
	    cp_mv "$ini_file_tmp" "$ini_file"
	
	
	    if [ -e "$ini_file_tmp" ]; then
		rm -f "$ini_file_tmp"
	    fi
	fi
done


db_stop || true


# Restart Apache2 web server if needed.
#
if [ $need_restart -eq 1 ]; then
	
	# Check Apache2 web server configuration.
	if /usr/sbin/apache2ctl configtest 2>/dev/null; then

		# Restart Apache2 web server.
		if [ -x "/etc/init.d/apache2" ]; then
	            if [ -x "`which invoke-rc.d 2>/dev/null`" ]; then
			invoke-rc.d apache2 force-reload || true
		    else
			/etc/init.d/apache2 force-reload || true
	    	    fi
		fi
	else
	
		# Something is broken.
		cp_echo "CN: Your Apache2 configuration is broken."
		cp_echo "CN: Please, check the service after the installation finishes!"
	fi
fi


# Mail root
#
cp_mail "$PKG"

exit 0