#!/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


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

PKG="php4-cn"
A2MODEDIR="/etc/apache2/mods-enabled"
EXTENSIONS="mysql"
PHP4DIR="/etc/php4"
PHP4CONFD="/etc/php4/conf.d"

need_restart=0


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


# Check if PHP4 extensions are enabled.
#
for php4ext in $EXTENSIONS; do

        php4ext_re="^[[:space:]]*extension[[:space:]]*=[[:space:]]*$php4ext\.so"

	# Remove extension entry from /etc/php4/(apache|apache2|cgi|cli).ini
	# configuration files.
        for SAPI in apache apache2 cgi cli; do

		if [ -d "$PHP4DIR/$SAPI" ]; then

            	    ini_file="$PHP4DIR/$SAPI/php.ini"

            	    if [ -f "$ini_file" ]; then

			cp_echo "CN: Removing $php4ext extension from file $ini_file"

			cp_check_and_sed "$php4ext_re" \
				"/$php4ext_re/d" \
				"$ini_file" && need_restart=1 || true
            	    fi
		fi
        done

	# Check $PHP4CONFD directory.
	if [ ! -d "$PHP4CONFD" ]; then
		cp_echo "CN: Creating configuration directory $PHP4CONFD"
		mkdir $PHP4CONFD
	fi

	# Check extension configuration in /etc/php4/conf.d/ directory.
	if [ ! -f "$PHP4CONFD/$php4ext.ini" ]; then

		cp_echo "CN: Creating configuration file $PHP4CONFD/$php4ext.ini"
		
		php4ext_up=`echo $php4ext | tr [:lower:] [:upper:] | sed 's/Y/y/'`
		INITMP=`mktemp $PHP4CONFD/$php4ext.ini.tmp.XXXXXX`

		cp_echo "CN: Adding $php4ext extension to file $PHP4CONFD/$php4ext.ini"
		
		echo -e "# configuration for php $php4ext_up module\nextension=$php4ext.so" >> "$INITMP"
		cp_mv "$INITMP" "$PHP4CONFD/$php4ext.ini"
		
		need_restart=1
	else

		if ! grep -q "$php4ext_re" "$PHP4CONFD/$php4ext.ini"; then

			cp_echo "CN: Adding $php4ext extension to file $PHP4CONFD/$php4ext.ini"
			
			INITMP=`mktemp $PHP4CONFD/$php4ext.ini.tmp.XXXXXX`
			cat "$PHP4CONFD/$php4ext.ini" > "$INITMP"
			echo "extension=$php4ext.so" >> "$INITMP"
			cp_mv "$INITMP" "$PHP4CONFD/$php4ext.ini"
			
			need_restart=1
		fi
	fi
done


# Enable some PHP4 tweaks for Apache2 web server (/etc/php4/apache2/php.ini).
#
#   * upload_max_filesize = 256M
#   * post_max_size = 256M
#   * memory_limit = 256M
#
for SAPI in apache apache2 cgi cli; do

	if [ ! -d "$PHP4DIR/$SAPI" ]; then
		continue
	fi

	ini_file="$PHP4DIR/$SAPI/php.ini"

	cp_echo "CN: Checking and enabling some CARNet specific parameters in file $ini_file"
	
        if [ -f "$ini_file" ]; then

		cp_check_and_sed "^[[:space:]]*upload_max_filesize[[:space:]]*=[[:space:]]*2M$" \
			's/^[[:space:]]*upload_max_filesize[[:space:]]*=.*/upload_max_filesize = 256M/' \
			"$ini_file" && need_restart=1 || true

		cp_check_and_sed "^[[:space:]]*post_max_size[[:space:]]*=[[:space:]]*8M$" \
			's/^[[:space:]]*post_max_size[[:space:]]*=.*/post_max_size = 256M/' \
			"$ini_file" && need_restart=1 || true

		cp_check_and_sed "^[[:space:]]*memory_limit[[:space:]]*=[[:space:]]*16M$" \
			's/^[[:space:]]*memory_limit[[:space:]]*=.*/memory_limit = 256M/' \
			"$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|post_max_size|memory_limit)[[:space:]]*=" $ini_file_tmp; then

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


# 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