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#! /usr/bin/perl
#
# Copyright 2001,2003,2004,2005 by Stefan Hornburg (Racke) <racke@linuxia.de>
#
# 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 2 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.
#
# You should have received a copy of the GNU General Public
# License along with this program; if not, write to the Free
# Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
# MA 02110-1301 USA.

use strict;
use warnings;

# constants we use
my $lock_ex = 2;
my $lock_un = 8;

# configuration files which we modify
my $featconf = '/etc/interchange/features.cfg';
my $settingsconf = '/etc/interchange/settings.cfg';

# Interchange variables
my %setvars = (DEBUG => 0, FULL_URL => 0, ROBOTS => 1, SOAP => 0,
SWISH => 0, TRAFFIC => 'low', UI_LOCALE => 'en_US');
my %requires = (SOAP => ['SOAP::Lite']);
my %featvars = (UI => '', USE_FOUNDATION => '', USE_STANDARD => '',
MV_GETPPID_BROKEN => 0);
my %skipvars;

# other variables
my (@tokens, $varref);

# parse commandline
for (@ARGV) {
unless (/\S+=/) {
die "$0: invalid parameter '$_'\n";
}
@tokens = split(/=/);
if (exists($setvars{$tokens[0]})) {
$varref = \%setvars;
} elsif (exists($featvars{$tokens[0]})) {
$varref = \%featvars;
} else {
die "$0: no such variable $tokens[0]\n";
}
if (defined $tokens[1]) {
$varref->{$tokens[0]} = $tokens[1];
} else {
$varref->{$tokens[0]} = '';
}
# don't override these settings
$skipvars{$tokens[0]} = 1;
}

# modify features configuration
&update_configfile($featconf, 0, \%featvars);

# modify settings configuration
&update_configfile($settingsconf, 1, \%setvars);

sub update_configfile {
my ($configfile, $modsallowed, $varref) = @_;

if (-f $configfile) {
open (SCONF, "+<$configfile")
|| die ("$0: Couldn't open $configfile: $!\n");
flock (SCONF, $lock_ex);
while (<SCONF>) {
# strip leading/trailing whitespace
s/^\s+//; s/^\s+$//;
# skip comment lines/blank lines
next if /^\#/; next unless /\S/;
# check for "Variable"'s
@tokens = split (/\s+/, $_, 3);
next if $tokens[0] ne 'Variable';
next if exists $skipvars{$tokens[1]};
# record values found
if (exists $varref->{$tokens[1]}) {
if (defined $tokens[2]) {
$varref->{$tokens[1]} = $tokens[2];
} else {
$varref->{$tokens[1]} = '';
}
}
}
truncate (SCONF, 0)
|| die ("$0: Couldn't truncate $configfile: $!\n");
seek (SCONF, 0, 0)
|| die ("$0: Seek failed on $configfile: $!\n");
} else {
open (SCONF, ">$configfile")
|| die ("$0: Couldn't open $configfile: $!\n");
}

if ($modsallowed) {
print SCONF <<EOF;
# This file is automatically generated by $0.
# You may modify this file, but this is NOT recommended.

EOF
    } else {
print SCONF <<EOF;
# This file is automatically generated by $0.
# You may NOT modify this file, because it reflects the
# installation state of the Interchange packages.

EOF
}

for (sort (keys %$varref)) {
print SCONF "Variable $_ $varref->{$_}\n";
}
flock (SCONF, $lock_un);
close (SCONF)
|| die ("$0: Couldn't close $configfile: $!\n");
}


=head1 NAME

interchangeconfig - Updates Debian specific Interchange configuration files

=head1 DESCRIPTION

interchangeconfig reads and writes the Interchange configuration files
/etc/interchange/features.cfg and /etc/interchange/settings.cfg.

The following settings can be changed with C<interchangeconfig>:

=over 4

=item C<DEBUG>

Whether to enable debug mode or not.

=back

=over 4

=item C<ROBOTS>

The Interchange Debian package uses a separate configuration file
C</etc/interchange/robots.cfg> for the directives C<RobotUA>, C<RobotIP>
and C<RobotHost>. It is recommended to include these settings so
Interchange can distinguish between robots and ordinary users.

=back

=over 4

=item C<SWISH>

Whether to enable Swish search or not.

=over 4

=item C<SOAP>

This setting determines if Interchange starts the SOAP server as well.
This is only available if the Perl module SOAP::Lite is installed.

=back

=over 4

=item C<TRAFFIC>

You can choose different sets of server parameters (C<low>, C<high> and
C<rpc>). Any store based on the foundation demo will change its behaviour too.
If C<rpc> is selected, the Interchange server will run in PreFork mode.

=back

=head1 AUTHOR

Stefan Hornburg (Racke), racke@linuxia.de

=head1 SEE ALSO

interchange(1p)

=cut
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