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##############################################################################
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# by David Cantrell <david@cantrell.org.uk>
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# This program calculates the differences between two directories. It is
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# designed to work with two different subdirectories under the rsnapshot
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# snapshot_root. For example:
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# rsnapshot-diff /.snapshots/daily.0/ /.snapshots/daily.1/
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# http://www.rsnapshot.org/
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##############################################################################
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# $Id: rsnapshot-diff.pl,v 1.3 2006/05/31 19:51:03 drhyde Exp $
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rsnapshot-diff - a utility for comparing the disk usage of two snapshots
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use constant DEBUG => 0;
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my $program_name = 'rsnapshot-diff';
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my $result = getopts('vVhi', \%opts);
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$program_name [-vVhi] dir1 dir2
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$program_name shows the differences between two 'rsnapshot' backups.
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-V be more verbose (mutter about unchanged files)
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-i ignore symlinks, directories, and special files in verbose output
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dir1 the first directory to look at
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dir2 the second directory to look at
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if you want to look at directories called '-h' or '-v' pass a
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first parameter of '--'.
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$program_name always show the changes made starting from the older
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of the two directories.
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rsnapshot-diff [-h|vVi] dir1 dir2
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rsnapshot-diff is a companion utility for rsnapshot, which traverses two
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parallel directory structures and calculates the difference between them.
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By default it is silent apart from displaying summary information at the
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end, but it can be made more verbose.
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In the summary, "added" files may very well include files which at first
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glance also appear at the same place in the older directory structure.
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However, because the files differ in some respect, they are different files.
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They have a different inode number. Consequently if you use -v most of its
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output may appear to be pairs of files with the same name being removed
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Displays help information
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Be verbose. This will spit out a list of all changes as they are encountered,
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as well as the summary at the end.
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=item -V (more verbose)
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Be more verbose - as well as listed changes, unchanged files will be listed
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If verbosity is turned on, -i suppresses information about symlinks,
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directories, and special files.
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These are the only compulsory parameters, and should be the names of two
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directories to compare. Their order doesn't matter, rsnapshot-diff will
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always compare the younger to the older, so files that appear only in the
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older will be reported as having been removed, and files that appear only
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in the younger will be reported as having been added.
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if ($opts{'v'}) { $verbose = 1; }
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if ($opts{'V'}) { $verbose = 2; }
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if ($opts{'i'}) { $ignore = 1; }
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if(!exists($ARGV[1]) || !-d $ARGV[0] || !-d $ARGV[1]) {
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die("$program_name\nUsage: $program_name [-vVhi] dir1 dir2\nType $program_name -h for details\n");
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my($dirold, $dirnew) = @ARGV;
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($dirold, $dirnew) = ($dirnew, $dirold) if(-M $dirold < -M $dirnew);
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print "Comparing $dirold to $dirnew\n";
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my($addedfiles, $addedspace, $deletedfiles, $deletedspace) = (0, 0, 0, 0);
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compare_dirs($dirold, $dirnew);
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print "Between $dirold and $dirnew:\n";
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print " $addedfiles were added, taking $addedspace bytes;\n";
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print " $deletedfiles were removed, saving $deletedspace bytes;\n";
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opendir(OLD, $old) || die("Can't open dir $old\n");
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opendir(NEW, $new) || die("Can't open dir $new\n");
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my $fn = $old.'/'.$_;
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($_, (mystat($fn))[1])
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} grep { $_ ne '.' && $_ ne '..' } readdir(OLD);
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my $fn = $new.'/'.$_;
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($_, (mystat($fn))[1])
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} grep { $_ ne '.' && $_ ne '..' } readdir(NEW);
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my @added = grep { !exists($old{$_}) } keys %new;
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my @deleted = grep { !exists($new{$_}) } keys %old;
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my @changed = grep { !-d $new.'/'.$_ && exists($old{$_}) && $old{$_} != $new{$_} } keys %new;
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add(map { $new.'/'.$_ } @added, @changed);
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remove(map { $old.'/'.$_ } @deleted, @changed);
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my %changed = map { ($_, 1) } @changed, @added, @deleted;
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print "0 $new/$_\n" foreach(grep { !-d "$new/$_" && !exists($changed{$_}) } keys %new);
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foreach (grep { !-l $new.'/'.$_ && !-l $old.'/'.$_ && -d $new.'/'.$_ && -d $old.'/'.$_ } keys %new) {
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print "Comparing subdirs $new/$_ and $old/$_ ...\n" if(DEBUG);
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compare_dirs($old.'/'.$_, $new.'/'.$_);
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print "Adding ".join(', ', @added)."\n" if(DEBUG && @added);
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foreach(grep { !-d } @added) {
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$addedspace += (mystat($_))[7];
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# if ignore is on, only print files
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unless ($ignore && (-l || !-f)) {
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print "+ $_\n" if($verbose);
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foreach my $dir (grep { !-l && -d } @added) {
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opendir(DIR, $dir) || die("Can't open dir $dir\n");
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add(map { $dir.'/'.$_ } grep { $_ ne '.' && $_ ne '..' } readdir(DIR))
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print "Removing ".join(', ', @removed)."\n" if(DEBUG && @removed);
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foreach(grep { !-d } @removed) {
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$deletedspace += (mystat($_))[7];
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# if ignore is on, only print files
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unless ($ignore && (-l || !-f)) {
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print "- $_\n" if($verbose);
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foreach my $dir (grep { !-l && -d } @removed) {
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opendir(DIR, $dir) || die("Can't open dir $dir\n");
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remove(map { $dir.'/'.$_ } grep { $_ ne '.' && $_ ne '..' } readdir(DIR))
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my @stat = (-l) ? lstat() : stat();
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# on first stat, memorise device
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$device = $stat[0] unless(defined($device));
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die("Can't compare across devices.\n(looking at $_)\n")
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unless($device == $stat[0] || -p $_);
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Please report bugs (and other comments) to the rsnapshot-discuss mailing list:
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L<http://lists.sourceforge.net/lists/listinfo/rsnapshot-discuss>
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David Cantrell E<lt>david@cantrell.org.ukE<gt>
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Copyright 2005 David Cantrell
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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rsnapshot-diff.pl
