#!/usr/bin/perl -w

=head1 NAME

ftp-watch.pl - Simple reporting for updates on remote FTP server.

=head1 DESCRIPTION

When run first time, this script generates a file with recursive listing
of some directory on remote FTP server.  Any other script execution will
cause it to report differences in directory listing using GNU diff format.

=cut

use Text::Diff;
use Net::FTP::Recursive;
use strict;

#
# Settings
# 
my $host = 'ftp.linux.dom';         # Server
my $user = 'anonymous';             # Username
my $pass = 'me@here.com';           # Password
my $dir  = '/pub/people/leonid/';   # Top directory to monitor
my $listing_file = '/tmp/ftp.real'; # Keep listing in this file
my $listing_temp = '/tmp/ftp.temp'; # Temporary file

# Get FTP listing
open (OUT, ">$listing_temp") or die "Couldn't open $listing_temp ($@)";
my $ftp = new Net::FTP::Recursive($host) or die "Couldn't connect ($@)";;
$ftp->login($user,$pass) or die "Couldn't login ($@)";
$ftp->cwd($dir) or die "Couldn't change directory ($@)";
$ftp->rls(Filehandle=>*OUT);
$ftp->quit();
close (OUT);

# Create empty data file if does not exist
if (! -e $listing_file) {
	warn "No local listing...creating empty";
	open (OUT, ">$listing_file") or die "Couldn't open $listing_file($@)";
	close (OUT);
}

# Compare
open (IN1, "<$listing_file") or die "Couldn't open $listing_file ($@)";
open (IN2, "<$listing_temp") or die "Couldn't open $listing_temp ($@)";
my $diff = diff \*IN1, \*IN2;
close (IN2);
close (IN1);

# Clean-up
rename ($listing_temp, $listing_file) or warn "Couldn't update info ($@)";

# Output results
print $diff,"\n";

=head1 AUTHOR

Leonid Mamtchenkov <leonid@leonid.maks.net>

=cut