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h1. Setup rsnapshot-diff

This Perl-Script is taken from http://cpansearch.perl.org/src/DCANTRELL/App-Rsnapshot-1.999_00002/bin/rsnapshot-diff

h2. install rnsapshot-diff

there is no actual install, just copy the file into your @/usr/local/bin@ and make it executable

<pre><code class="perl">

#!/usr/bin/perl -w

##############################################################################

# rsnapshot-diff

# by David Cantrell <david@cantrell.org.uk>

#

# This program calculates the differences between two directories. It is

# designed to work with two different subdirectories under the rsnapshot

# snapshot_root. For example:

#

#   rsnapshot-diff /.snapshots/daily.0/ /.snapshots/daily.1/

#

# http://www.rsnapshot.org/

##############################################################################

# $Id: rsnapshot-diff.pl,v 1.4 2009/03/06 13:40:04 hashproduct Exp $

=head1 NAME

rsnapshot-diff - a utility for comparing the disk usage of two snapshots

taken by rsnapshot

=cut

use strict;

use constant DEBUG => 0;

use Getopt::Std;

my $program_name = 'rsnapshot-diff';

my %opts;

my $verbose = 0;

my $ignore = 0;

my $show_size = 0;

my $result = getopts('vVhis', \%opts);

# help

if ($opts{'h'}) {

    print qq{

    $program_name [-vVhi] dir1 dir2

    $program_name shows the differences between two 'rsnapshot' backups.

    -h    show this help

    -v    be verbose

    -V    be more verbose (mutter about unchanged files)

    -s    show the size of each changed file

    -i    ignore symlinks, directories, and special files in verbose output

    dir1  the first directory to look at

    dir2  the second directory to look at

    if you want to look at directories called '-h' or '-v' pass a

    first parameter of '--'.

    $program_name always show the changes made starting from the older

    of the two directories.

};

	exit;

}

=head1 SYNOPSIS

rsnapshot-diff [-h|vVi] dir1 dir2

=head1 DESCRIPTION

rsnapshot-diff is a companion utility for rsnapshot, which traverses two

parallel directory structures and calculates the difference between them.

By default it is silent apart from displaying summary information at the

end, but it can be made more verbose.

In the summary, "added" files may very well include files which at first

glance also appear at the same place in the older directory structure.

However, because the files differ in some respect, they are different files.

They have a different inode number.  Consequently if you use -v most of its

output may appear to be pairs of files with the same name being removed

and added.

=head1 OPTIONS

=over 4

=item -h (help)

Displays help information

=item -v (verbose)

Be verbose.  This will spit out a list of all changes as they are encountered,

as well as the summary at the end.

=item -V (more verbose)

Be more verbose - as well as listed changes, unchanged files will be listed

too.

=item -s (show size)

Show the size of each changed file after the + or - sign.  To sort the files by

decreasing size, use this option and run the output through "sort -k 2 -rn".

=item -i (ignore)

If verbosity is turned on, -i suppresses information about symlinks,

directories, and special files.

=item dir1 and dir2

These are the only compulsory parameters, and should be the names of two

directories to compare.  Their order doesn't matter, rsnapshot-diff will

always compare the younger to the older, so files that appear only in the

older will be reported as having been removed, and files that appear only

in the younger will be reported as having been added.

=back

=cut

# verbose

if ($opts{'v'}) { $verbose = 1; }

# extra verbose

if ($opts{'V'}) { $verbose = 2; }

# ignore

if ($opts{'i'}) { $ignore = 1; }

# size

if ($opts{'s'}) { $show_size = 1; }

if(!exists($ARGV[1]) || !-d $ARGV[0] || !-d $ARGV[1]) {

    die("$program_name\nUsage: $program_name [-vVhi] dir1 dir2\nType $program_name -h for details\n");

}

my($dirold, $dirnew) = @ARGV;

($dirold, $dirnew) = ($dirnew, $dirold) if(-M $dirold < -M $dirnew);

print "Comparing $dirold to $dirnew\n";

my($addedfiles, $addedspace, $deletedfiles, $deletedspace) = (0, 0, 0, 0);

compare_dirs($dirold, $dirnew);

print "Between $dirold and $dirnew:\n";

print "  $addedfiles were added, taking $addedspace bytes;\n";

print "  $deletedfiles were removed, saving $deletedspace bytes;\n";

sub compare_dirs {

    my($old, $new) = @_;

    opendir(OLD, $old) || die("Can't open dir $old\n");

    opendir(NEW, $new) || die("Can't open dir $new\n");

    my %old = map {

        my $fn = $old.'/'.$_;

        ($_, (mystat($fn))[1])

    } grep { $_ ne '.' && $_ ne '..' } readdir(OLD);

    my %new = map {

        my $fn = $new.'/'.$_;

        ($_, (mystat($fn))[1])

    } grep { $_ ne '.' && $_ ne '..' } readdir(NEW);

    closedir(OLD);

    closedir(NEW);

    my @added = grep { !exists($old{$_}) } keys %new;

    my @deleted = grep { !exists($new{$_}) } keys %old;

    my @changed = grep { !-d $new.'/'.$_ && exists($old{$_}) && $old{$_} != $new{$_} } keys %new;

    add(map { $new.'/'.$_ } @added, @changed);

    remove(map { $old.'/'.$_ } @deleted, @changed);

    if($verbose == 2) {

        my %changed = map { ($_, 1) } @changed, @added, @deleted;

        print "0 $new/$_\n" foreach(grep { !-d "$new/$_" && !exists($changed{$_}) } keys %new);

    }

    foreach (grep { !-l $new.'/'.$_ && !-l $old.'/'.$_ && -d $new.'/'.$_ && -d $old.'/'.$_ } keys %new) {

        print "Comparing subdirs $new/$_ and $old/$_ ...\n" if(DEBUG);

        compare_dirs($old.'/'.$_, $new.'/'.$_);

    }

}

sub add {

    my @added = @_;

    print "Adding ".join(', ', @added)."\n" if(DEBUG && @added);

    foreach(grep { !-d } @added) {

        $addedfiles++;

        my $size = (mystat($_))[7];

        $addedspace += $size;

        # if ignore is on, only print files

        unless ($ignore && (-l || !-f)) {

            print ($show_size ? "+ $size $_\n" : "+ $_\n") if($verbose);

        }

    }

    foreach my $dir (grep { !-l && -d } @added) {

        opendir(DIR, $dir) || die("Can't open dir $dir\n");

        add(map { $dir.'/'.$_ } grep { $_ ne '.' && $_ ne '..' } readdir(DIR))

    }

}

sub remove {

    my @removed = @_;

    print "Removing ".join(', ', @removed)."\n" if(DEBUG && @removed);

    foreach(grep { !-d } @removed) {

        $deletedfiles++;

        my $size = (mystat($_))[7];

        $deletedspace += $size;

        # if ignore is on, only print files

        unless ($ignore && (-l || !-f)) {

            print ($show_size ? "- $size $_\n" : "- $_\n") if($verbose);

        }

    }

    foreach my $dir (grep { !-l && -d } @removed) {

        opendir(DIR, $dir) || die("Can't open dir $dir\n");

        remove(map { $dir.'/'.$_ } grep { $_ ne '.' && $_ ne '..' } readdir(DIR))

    }

}

{

    my $device;

    sub mystat {

        local $_ = shift;

        my @stat = (-l) ? lstat() : stat();

        # on first stat, memorise device

        $device = $stat[0] unless(defined($device));

        die("Can't compare across devices.\n(looking at $_)\n")

            unless($device == $stat[0] || -p $_);

        return @stat;

    }

}

=head1 SEE ALSO

rsnapshot

=head1 BUGS

Please report bugs (and other comments) to the rsnapshot-discuss mailing list:

L<http://lists.sourceforge.net/lists/listinfo/rsnapshot-discuss>

=head1 AUTHOR

David Cantrell E<lt>david@cantrell.org.ukE<gt>

=head1 COPYRIGHT

Copyright 2005 David Cantrell

=head1 LICENCE

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 Street, Fifth Floor, Boston, MA  02110-1301 USA

=cut

</code></pre>

h1. Check rsnapshot-diff

just

<pre><code class="bash">

/usr/local/bin/rsnapshot-diff -h

</code></pre>