#! /bin/sh
# preinst script for livesupport
#
# see: dh_installdeb(1)

set -e

# summary of how this script can be called:
#        * <new-preinst> `install'
#        * <new-preinst> `install' <old-version>
#        * <new-preinst> `upgrade' <old-version>
#        * <old-preinst> `abort-upgrade' <new-version>
#
# for details, see http://www.debian.org/doc/debian-policy/ or
# the debian-policy package

#-------------------------------------------------------------------------------
#   Function to check for a group to be available, and the ability
#   to set files to belong into that group
#
#   @param $1 the group to check
#   @return 0 if the groups id OK, non-0 otherwise
#-------------------------------------------------------------------------------
check_group_permission() {
    group_tmp_file=/tmp/ls_group_check.$$
    touch $group_tmp_file
    test_result=`chgrp $1 $group_tmp_file 2> /dev/null`
    if [ $? != 0 ]; then
        rm -f $group_tmp_file;
        echo "Unable to use apache deamon group $1.";
        echo "Please check if $1 is a correct user group.";
        return 1;
    fi
    rm -f $group_tmp_file;
    echo "Apache daemon group $1 OK.";

    return 0;
}

#-------------------------------------------------------------------------------
#  Function to check for the existence of an executable on the PATH
#
#  @param $1 the name of the exectuable
#  @return 0 if the executable exists on the PATH, non-0 otherwise
#-------------------------------------------------------------------------------
check_exe() {
    if [ -x "`which $1 2> /dev/null`" ]; then
        echo "Exectuable $1 found...";
        return 0;
    else
        echo "Exectuable $1 not found...";
        return 1;
    fi
}


#-------------------------------------------------------------------------------
#  Function to check for a PEAR module
#
#  @param $1 the name of the PEAR module
#  @return 0 if the module is available, non-0 otherwise
#-------------------------------------------------------------------------------
check_pear_module() {
    test_result=`pear info $1`
    if [ $? = 0 ]; then
        echo "PEAR module $1 found...";
        return 0;
    else
        echo "PEAR module $1 not found...";
        return 1;
    fi
}


#-------------------------------------------------------------------------------
#  Variables
#-------------------------------------------------------------------------------
apache_group=www-data


case "$1" in
    install|upgrade)
        echo "Checking for required tools..."

        check_exe "sed" || exit 1;
        check_exe "psql" || exit 1;
        check_exe "php" || exit 1;
        check_exe "pear" || exit 1;
        check_exe "odbcinst" || exit 1;

        echo "Checking for validity of apache daemon group $apache_group...";
        check_group_permission $apache_group || exit 1;

        if [ "$1" = "upgrade" ]; then
            /etc/init.d/livesupport-station stop || true
            /etc/init.d/livesupport-station kill || true
        fi
    ;;

    abort-upgrade)
    ;;

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

# dh_installdeb will replace this with shell code automatically
# generated by other debhelper scripts.

#DEBHELPER#

exit 0