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#!/usr/bin/perl
# this software is licensed for use under the Free Software Foundation's GPL v3.0 license, as retrieved
# from http://www.gnu.org/licenses/gpl-3.0.html on 2014-11-17. A copy should also be available in this
# project's Git repository at https://github.com/jimsalterjrs/sanoid/blob/master/LICENSE.
use strict;
use warnings;
my $zfs = '/sbin/zfs';
my %args = getargs(@ARGV);
my $progversion = '1.4.7';
if ($args{'version'}) { print "$progversion\n"; exit 0; }
my $dataset = getdataset($args{'path'});
my %versions = getversions($args{'path'}, $dataset);
foreach my $version (sort { $versions{$a}{'mtime'} <=> $versions{$b}{'mtime'} } keys %versions) {
my $disptime = localtime($versions{$version}{'mtime'});
my $dispsize = humansize($versions{$version}{'size'});
print "$disptime\t$dispsize\t$version\n";
}
exit 0;
###################################################################
###################################################################
###################################################################
sub humansize {
my ($rawsize) = @_;
my $humansize;
if ($rawsize > 1024*1024*1024) {
$humansize = sprintf("%.1f",$rawsize/1024/1024/1024) . ' GB';
} elsif ($rawsize > 1024*1024) {
$humansize = sprintf("%.1f",$rawsize/1024/1024) . ' MB';
} elsif ($rawsize > 255) {
$humansize = sprintf("%.1f",$rawsize/1024) . ' KB';
} else {
$humansize = $rawsize . ' Bytes';
}
return $humansize;
}
sub getversions {
my ($path, $dataset) = @_;
my @snaps = findsnaps($dataset, $args{'path'});
my $snappath = '.zfs/snapshot';
my $relpath = $path;
$relpath =~ s/^$dataset\///;
my %versions;
foreach my $snap (@snaps) {
my $filename = "$dataset/$snappath/$snap/$relpath";
my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,$atime,$mtime,$ctime,$blksize,$blocks) = stat($filename);
# only push to the $versions hash if this size and mtime aren't already present (simple dedupe)
my $duplicate = 0;
foreach my $version (keys %versions) {
if ($versions{$version}{'size'} eq $size && $versions{$version}{'mtime'} eq $mtime) {
$duplicate = 1;
}
}
if (! $duplicate) {
$versions{$filename}{'size'} = $size;
$versions{$filename}{'mtime'} = $mtime;
}
}
return %versions;
}
sub findsnaps {
my ($dataset, $path) = @_;
my $snappath = '.zfs/snapshot';
my $relpath = $path;
$relpath =~ s/^$dataset//;
my @snaps;
opendir (my $dh, "$dataset/$snappath");
while (my $dir=(readdir $dh)) {
if ($dir ne '.' && $dir ne '..') { push @snaps, $dir; }
}
closedir $dh;
return @snaps;
}
sub getdataset {
my ($path) = @_;
open FH, "$zfs list -Ho mountpoint |";
my @datasets = <FH>;
close FH;
my @matchingdatasets;
foreach my $dataset (@datasets) {
chomp $dataset;
if ( $path =~ /^$dataset/ ) { push @matchingdatasets, $dataset; }
}
my $bestmatch = '';
foreach my $dataset (@matchingdatasets) {
if ( length $dataset > length $bestmatch ) { $bestmatch = $dataset; }
}
return $bestmatch;
}
sub getargs {
my @args = @_;
my %args;
my %novaluearg;
my %validarg;
push my @validargs, ('debug','version');
foreach my $item (@validargs) { $validarg{$item} = 1; }
push my @novalueargs, ('debug','version');
foreach my $item (@novalueargs) { $novaluearg{$item} = 1; }
while (my $rawarg = shift(@args)) {
my $arg = $rawarg;
my $argvalue;
if ($rawarg =~ /=/) {
# user specified the value for a CLI argument with =
# instead of with blank space. separate appropriately.
$argvalue = $arg;
$arg =~ s/=.*$//;
$argvalue =~ s/^.*=//;
}
if ($rawarg =~ /^--/) {
# doubledash arg
$arg =~ s/^--//;
if (! $validarg{$arg}) { die "ERROR: don't understand argument $rawarg.\n"; }
if ($novaluearg{$arg}) {
$args{$arg} = 1;
} else {
# if this CLI arg takes a user-specified value and
# we don't already have it, then the user must have
# specified with a space, so pull in the next value
# from the array as this value rather than as the
# next argument.
if ($argvalue eq '') { $argvalue = shift(@args); }
$args{$arg} = $argvalue;
}
} elsif ($arg =~ /^-/) {
# singledash arg
$arg =~ s/^-//;
if (! $validarg{$arg}) { die "ERROR: don't understand argument $rawarg.\n"; }
if ($novaluearg{$arg}) {
$args{$arg} = 1;
} else {
# if this CLI arg takes a user-specified value and
# we don't already have it, then the user must have
# specified with a space, so pull in the next value
# from the array as this value rather than as the
# next argument.
if ($argvalue eq '') { $argvalue = shift(@args); }
$args{$arg} = $argvalue;
}
} else {
# bare arg
$args{'path'} = $arg;
}
}
return %args;
}
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