#! /bin/sh
# postrm script for campcaster
#
# see: dh_installdeb(1)

set -e

# summary of how this script can be called:
#        * <postrm> `remove'
#        * <postrm> `purge'
#        * <old-postrm> `upgrade' <new-version>
#        * <new-postrm> `failed-upgrade' <old-version>
#        * <new-postrm> `abort-install'
#        * <new-postrm> `abort-install' <old-version>
#        * <new-postrm> `abort-upgrade' <old-version>
#        * <disappearer's-postrm> `disappear' <r>overwrit>r> <new-version>
# for details, see http://www.debian.org/doc/debian-policy/ or
# the debian-policy package

installdir=/opt/campcaster
apache_docroot=/var/www

postgres_user=postgres
postgresql_dir=/etc/postgresql/8.1/main
postgresql_init_script=/etc/init.d/postgresql-8.1

ls_dbserver=localhost
ls_database=Campcaster
ls_dbuser=campcaster


#-------------------------------------------------------------------------------
#  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
}


case "$1" in
        remove|upgrade|failed-upgrade|abort-install|abort-upgrade)
            # remove the init script
            rm -f /etc/init.d/campcaster-scheduler
            update-rc.d campcaster-scheduler remove
            
            # remove the symlink to the campcaster web pages
            rm -f $apache_docroot/campcaster
            
            # restore the old pg_hba.conf file
            if [ -f $postgresql_dir/pg_hba.conf ] \
               && [ -f $postgresql_dir/pg_hba.conf.before-campcaster ] ; then
                mv -f $postgresql_dir/pg_hba.conf \
                      $postgresql_dir/pg_hba.conf.campcaster ;
                mv -f $postgresql_dir/pg_hba.conf.before-campcaster \
                      $postgresql_dir/pg_hba.conf ;
            fi
        ;;

        purge|disappear)
            echo "Checking for required tools..."

            check_exe "psql" || exit 1;
            check_exe "odbcinst" || exit 1;


            echo "Deleting data files...";

            rm -rf $installdir/etc/scheduler.xml
            rm -rf $installdir/etc/gst-registry.xml
            rm -rf $installdir/etc/pear.conf
            rm -rf $installdir/var/Campcaster/htmlUI/var/html/img/*
            rm -rf $installdir/var/Campcaster/htmlUI/var/templates_c/*
            rm -rf $installdir/var/Campcaster/storageServer/var/stor/*
            rm -rf $installdir/var/Campcaster/storageServer/var/access/*
            rm -rf $installdir/var/Campcaster/storageServer/var/trans/*
            rm -rf $installdir/var/Campcaster/archiveServer/var/stor/*
            rm -rf $installdir/var/Campcaster/archiveServer/var/access/*
            rm -rf $installdir/var/Campcaster/archiveServer/var/trans/*


            echo "Removing ODBC data source and driver...";
            
            # kill active connections to database
            $postgresql_init_script stop
            $postgresql_init_script start

            echo "Removing Campcaster ODBC data source...";
            odbcinst -u -s -l -n $ls_database || exit 1;

            echo "De-registering ODBC PostgreSQL driver...";
            odbcinst -u -d -n PostgreSQL_Campcaster || exit 1;


            echo "Removing database and database user...";

            if [ "x$ls_dbserver" == "xlocalhost" ]; then
                su - $postgres_user -c \
                                "echo \"DROP DATABASE \\\"$ls_database\\\" \"\
                                        | psql template1" \
                    || echo "Couldn't drop database $ls_database.";

                su - $postgres_user -c "echo \"DROP USER $ls_dbuser \"\
                                        | psql template1" \
                    || echo "Couldn't drop database user $ls_dbuser.";

            else
                echo "Unable to automatically drop database user and table for";
                echo "remote database $ls_dbserver.";
                echo "Make sure to drop database user $ls_dbuser on database";
                echo "server at $ls_dbserver.";
                echo "Also drop the database called $ld_database.";
                echo "";
                echo "The easiest way to achieve this is by issuing the";
                echo "following SQL commands to PostgreSQL:";
                echo "DROP DATABASE \"$ls_database\";";
                echo "DROP USER $ls_dbuser;";
            fi
        ;;

    *)
        echo "postrm 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