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Filename : pkconffile
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#!/usr/bin/perl

use Debconf::Client::ConfModule ':all';
use Cwd 'abs_path';
use File::Temp qw/ tempfile tempdir /;
use strict;

my $template_fname;
(undef, $template_fname) = tempfile('/tmp/pkconffileXXXXXX', SUFFIX => '.template');

# (1) quit unless we have the correct number of command-line args
if ($#ARGV + 1 != 3) {
    print STDERR "Usage: ./pkconffile package original_conf new_conf\n";
    exit;
}

## Process template so we can add the diff at the end
## the abs_path will give us the full path where this script is so we can find the template
open (TEMP_NODIFF, abs_path($0).'.nodiff') || die ("could not open the template");
open (TEMPLATE, ">$template_fname");

## Adds the original template
while (<TEMP_NODIFF>) {
    print TEMPLATE $_;
}
close (TEMP_NODIFF);

## get the original and new files
my $package = $ARGV[0];
my $forig   = $ARGV[1];
my $fnew    = $ARGV[2];

## Add the diff to the end of the TEMPLATE
my @diff = `diff -u $forig $fnew`;
foreach (@diff) {
    if ($_ =~ /^\$/) {
        print TEMPLATE " .\n";
    } else {
        chomp;
        ## Add two spaces here so that the extended description
        ## receives the proper line breaks.
        print TEMPLATE "  $_\n";
    }
}
close (TEMPLATE);

## Force the template to be loaded again
x_loadtemplatefile($template_fname);

## set the package name in the title
subst("pkconffile/title", "package", $package);
settitle("pkconffile/title");

my $state = 1;
while (1) {
    if ($state == 1) {
        ## ask the user what to do with the conf file
        fset("pkconffile/what_to_do", "seen", "false");
        subst("pkconffile/what_to_do", "forig", $forig);
        input("high", "pkconffile/what_to_do");
    } else {
        ## the user whants to see the diff
        fset("pkconffile/diff", "seen", "false");
        subst("pkconffile/diff", "forig", $forig);
        subst("pkconffile/diff", "fnew", $fnew);
        input("high", "pkconffile/diff");
    }

    ## get the user answer
    if (go() == 0 && $state == 1) {
        my @ret = get("pkconffile/what_to_do");
        if ($ret[1] =~ "Keep the currently installed version") {
            $state = 10;
            last;
        } elsif ($ret[1] =~ "Install the package maintainer's version") {
            $state = 20;
            last;
        }
        $state = 2;
    } else {
        $state = 1;
    }
}

unlink($template_fname);
exit $state;