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duplicity-backup.pl
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duplicity-backup.pl
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#!/usr/bin/env perl
#
#
# backup tool, wrapper around duplicity
#
# written by Andreas 'ads' Scherbaum <andreas@scherbaum.biz>
#
# "duplicity-backup.pl" is released under the PostgreSQL License,
# a liberal Open Source license, similar to the BSD or MIT
# licenses.
#
#
# Copyright (c) 2012, Andreas Scherbaum
#
# Permission to use, copy, modify, and distribute this software
# and its documentation for any purpose, without fee, and without
# a written agreement is hereby granted, provided that the above
# copyright notice and this paragraph and the following two paragraphs
# appear in all copies.
#
# IN NO EVENT SHALL Andreas Scherbaum BE LIABLE TO ANY PARTY FOR
# DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES,
# INCLUDING LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE
# AND ITS DOCUMENTATION, EVEN IF Andreas Scherbaum HAS BEEN ADVISED
# OF THE POSSIBILITY OF SUCH DAMAGE.
#
# Andreas Scherbaum SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
# BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
# AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED
# HEREUNDER IS ON AN "AS IS" BASIS, AND Andreas Scherbaum HAS
# NO OBLIGATIONS TO PROVIDE MAINTENANCE, SUPPORT, UPDATES,
# ENHANCEMENTS, OR MODIFICATIONS.
package backup::config;
#
# config class for backup
#
# config file schema:
#
# key = value
# key= value
# key =value
# key=value
# key=
# key = value
# ...
# usage:
#
# $config = backup::config->new(<configfile>);
# $var = $config->config_get_key(<key name>);
# $config->config_set_key(<key name>, <new value>);
# $config->config_delete_key(<key name>);
# %var = $config->config_get_keys();
use strict;
use POSIX; # some standards
use FileHandle; # have variables for the filehandles
use Data::Dumper;
use YAML::XS qw (/./);
# new()
#
# constructor
#
# parameter:
# - class name
# return:
# - pointer to config class
sub new {
my $class = shift;
my $self = {};
# bless mysqlf
bless($self, $class);
# define own variables
# config file name
$self->{config_file} = undef;
$self->{config} = undef;
# return reference
return $self;
}
# read_config()
#
# read in a config file
#
# parameter:
# - self
# - config filename
# return:
# none
sub read_config {
my $self = shift;
my $config_file = shift;
# test if config file exists
if (!-f $config_file) {
die "could not find config file: $config_file\n";
}
my $config = LoadFile($config_file);
# save config file name for later use
$self->{config_file} = $config_file;
# set config to 'not changed'
$self->{changed} = 0;
# store config
$self->{config} = $config;
return;
}
# DESTROY()
#
# destructor
#
# parameter:
# - self
# return:
# none
sub DESTROY {
my $self = shift;
}
# config_get_key1()
#
# return a config value
#
# parameter:
# - self
# - config key name 1
# return:
# - value of config parameter (or undef)
sub config_get_key1 {
my $self = shift;
my $key1 = shift;
if (!defined($self->{config}->{$key1})) {
return undef;
}
# return value
return $self->{config}->{$key1};
}
# config_set_key1()
#
# set a config value
#
# parameter:
# - self
# - config key name 1
# - new value
# return:
# none
sub config_set_key1 {
my $self = shift;
my $key1 = shift;
my $value = shift;
$self->{config}->{$key1} = $value;
return;
}
# config_get_key2()
#
# return a config value
#
# parameter:
# - self
# - config key name 1
# - config key name 2
# return:
# - value of config parameter (or undef)
sub config_get_key2 {
my $self = shift;
my $key1 = shift;
my $key2 = shift;
if (!defined($self->{config}->{$key1})) {
return undef;
}
if (!defined($self->{config}->{$key1}->{$key2})) {
return undef;
}
# return value
return $self->{config}->{$key1}->{$key2};
}
# config_set_key2()
#
# set a config value
#
# parameter:
# - self
# - config key name 1
# - config key name 2
# - value
# return:
# none
sub config_set_key2 {
my $self = shift;
my $key1 = shift;
my $key2 = shift;
my $value = shift;
$self->{config}->{$key1}->{$key2} = $value;
return;
}
# config_get_key3()
#
# return a config value
#
# parameter:
# - self
# - config key name 1
# - config key name 2
# - config key name 3
# return:
# - value of config parameter (or undef)
sub config_get_key3 {
my $self = shift;
my $key1 = shift;
my $key2 = shift;
my $key3 = shift;
if (!defined($self->{config}->{$key1})) {
return undef;
}
if (!defined($self->{config}->{$key1}->{$key2})) {
return undef;
}
if (!defined($self->{config}->{$key1}->{$key2}->{$key3})) {
return undef;
}
# return value
return $self->{config}->{$key1}->{$key2}->{$key3};
}
# config_set_key3()
#
# set a config value
#
# parameter:
# - self
# - config key name 1
# - config key name 2
# - config key name 3
# - value
# return:
# none
sub config_set_key3 {
my $self = shift;
my $key1 = shift;
my $key2 = shift;
my $key3 = shift;
my $value = shift;
$self->{config}->{$key1}->{$key2}->{$key3} = $value;
return;
}
# config_delete_key()
#
# delete a config key
#
# parameter:
# - self
# - config key name 1
# return:
# none
sub config_delete_key1 {
my $self = shift;
my $key1 = shift;
# delete key
delete($self->{config}->{$key1});
# mark config changed
$self->{changed} = 1;
}
# config_delete_key2()
#
# delete a config key
#
# parameter:
# - self
# - config key name 1
# - config key name 2
# return:
# none
sub config_delete_key2 {
my $self = shift;
my $key1 = shift;
my $key2 = shift;
# delete key
delete($self->{config}->{$key1}->{$key2});
# mark config changed
$self->{changed} = 1;
}
# config_delete_key3()
#
# delete a config key
#
# parameter:
# - self
# - config key name 1
# - config key name 2
# - config key name 3
# return:
# none
sub config_delete_key3 {
my $self = shift;
my $key1 = shift;
my $key2 = shift;
my $key3 = shift;
# delete key
delete($self->{config}->{$key1}->{$key2}->{$key3});
# mark config changed
$self->{changed} = 1;
}
# config_get_keys1()
#
# return hash with all defined config keys
#
# parameter:
# - self
# - config key 1
# return:
# - hash with config keys
sub config_get_keys1 {
my $self = shift;
my $key1 = shift;
if (!defined($self->{config}->{$key1})) {
return undef;
}
if (ref($self->{config}->{$key1}) eq '') {
# return value
return $self->{config}->{$key1};
}
if (ref($self->{config}->{$key1}) eq 'HASH') {
# return sorted hash
my $config = $self->{config}->{$key1};
my %config = %$config;
# returns an array with the values
return sort(keys(%config));
}
if (ref($self->{config}->{$key1}) eq 'ARRAY') {
die("FIXME: not yet implemented - required?\n");
}
return undef;
}
# config_get_keys2()
#
# return hash with all defined config keys
#
# parameter:
# - self
# - config key 1
# - config key 2
# return:
# - hash with config keys
sub config_get_keys2 {
my $self = shift;
my $key1 = shift;
my $key2 = shift;
if (!defined($self->{config}->{$key1})) {
return undef;
}
if (!defined($self->{config}->{$key1}->{$key2})) {
return undef;
}
if (ref($self->{config}->{$key1}->{$key2}) eq '') {
# return value
return $self->{config}->{$key1}->{$key2};
}
if (ref($self->{config}->{$key1}->{$key2}) eq 'HASH') {
# return sorted hash
my $config = $self->{config}->{$key1}->{$key2};
my %config = %$config;
# returns an array with the values
return sort(keys(%config));
}
if (ref($self->{config}->{$key1}->{$key2}) eq 'ARRAY') {
die("FIXME: not yet implemented - required?\n");
}
return undef;
}
# config_file()
#
# return the name of the config file
#
# parameter:
# none
# return:
# - config file name
sub config_file {
my $self = shift;
return $self->{config_file};
}
# end module
1;
######################################################################
# #
# Main #
# #
######################################################################
package main;
use strict;
use warnings;
use Getopt::Long qw( :config no_ignore_case );
use FileHandle;
use Data::Dumper;
use YAML::XS qw (/./);
use Date::Manip;
use Date::Parse;
use Time::Duration;
use Time::Duration::Parse;
use Time::HiRes qw( gettimeofday tv_interval );
use Net::FTP;
import backup::config;
######################################################################
# initialize global variables
######################################################################
use constant DEBUG2 => 5;
use constant DEBUG => 4;
use constant INFO => 3;
use constant WARN => 2;
use constant ERROR => 1;
%main::loglevels = (
5 => 'DEBUG2',
4 => 'DEBUG',
3 => 'INFO',
2 => 'WARN',
1 => 'ERROR',
);
$main::loglevel = INFO;
######################################################################
# handle command line arguments
######################################################################
# defaults
$main::help = 0;
$main::debug = 0;
$main::quiet = 0;
$main::config_file = "";
$main::status = 0;
$main::cleanup_old_logs = 0;
$main::monitoring = 0;
# parse options
unless (
GetOptions(
'help|h|?' => \$main::help,
'debug|d' => \$main::debug,
'quiet|q' => \$main::quiet,
'config|c=s' => \$main::config_file,
'logfile|l=s' => \$main::logfile,
'status|s' => \$main::status,
'cleanup-old-logs' => \$main::cleanup_old_logs,
'monitoring|m' => \$main::monitoring,
)
) {
# There were errors with parsing command line options - show help.
$main::help = 1;
}
if ($main::debug == 1) {
$main::loglevel = DEBUG;
}
if ($main::quiet == 1) {
$main::loglevel = ERROR;
}
######################################################################
# Main
######################################################################
if ($main::help == 1) {
print <<_END_OF_HELP_;
$0 [options]
The following options are available:
-h --help This help
-d --debug Enable debug messages
-c --config Config file (required)
-l --logfile Logfile
-s --status Add backup status to output
-m --monitoring Output monitoring status
(make sure to add the -q option)
_END_OF_HELP_
exit(0);
}
init_config();
if (length($main::config_file) > 0) {
read_config($main::config_file);
} else {
print_msg("No configfile!", ERROR);
exit(1);
}
# pre-flight checks
my $check_duplicity = config_get_keys2('config', 'duplicity');
if (!defined($check_duplicity)) {
print_msg("duplicity path must be set in config", ERROR);
exit(1);
}
if (!-f $check_duplicity or !-e $check_duplicity) {
print_msg("duplicity binary not available", ERROR);
exit(1);
}
my $check_volsize = config_get_keys2('config', 'volsize');
if (!defined($check_volsize) or length($check_volsize) == 0) {
print_msg("global volsize must be set", ERROR);
exit(1);
}
my $check_log_directory = config_get_keys2('config', 'log-directory');
if (!defined($check_log_directory) or length($check_log_directory) == 0) {
print_msg("global log-directory must be set", ERROR);
exit(1);
}
if (!-d $check_log_directory) {
print_msg("global log-directory must exist", ERROR);
exit(1);
}
if ($check_log_directory !~ /\/$/) {
# complete path of log directory, make it easier for repetitive calls
config_set_key2('config', 'log-directory', $check_log_directory . '/');
}
my $check_archive_directory = config_get_keys2('config', 'archive-directory');
if (!defined($check_archive_directory) or length($check_archive_directory) == 0) {
# set to an empty value, will not be used later
config_set_key2('config', 'archive-directory', '');
print_msg("no archive-dir is used", DEBUG);
} else {
if (!-d $check_archive_directory) {
print_msg("global archive-directory must exist", ERROR);
exit(1);
}
print_msg("archive-dir is: $check_archive_directory", DEBUG);
}
print_msg("Initialization done, start backup", INFO);
if ($main::monitoring == 1) {
main_monitoring();
exit(0);
} else {
main_backup();
exit(0);
}
######################################################################
# regular functions used by the backup
######################################################################
# main_backup()
#
# main routine doing the backup
#
# parameter:
# none
# return:
# none
sub main_backup {
my @backups = config_get_keys1('backup');
# walk through all backups
foreach my $backup (@backups) {
print_msg("Backup task: " . $backup, INFO);
my $status = run_backup($backup);
if ($status == 0) {
print_msg("backup task '$backup' did not run, because of errors", ERROR);
} elsif ($status == 1) {
print_msg("backup task '$backup' finished successfully", INFO);
}
}
}
# main_monitoring()
#
# main routine doing the monitoring
#
# parameter:
# none
# return:
# none
sub main_monitoring {
my @backups = config_get_keys1('backup');
# check all backups for status
my $backup_status = 1;
my @backup_ok = ();
my @backup_warning = ();
my @backup_fail = ();
my @backup_unknown = ();
foreach my $backup (@backups) {
# keep in mind that this line will be printed to STDOUT - and might confuse monitoring plugins
# use the -q option
print_msg("Backup task: " . $backup, INFO);
my $status = status_backup($backup);
if ($status == -1) {
# ignore
print_msg("Status: disabled", INFO);
} elsif ($status == 0) {
# OK
push(@backup_ok, $backup);
print_msg("Status: OK", INFO);
} elsif ($status == 1) {
# WARNING
push(@backup_warning, $backup);
print_msg("Status: WARNING", INFO);
} elsif ($status == 2) {
# CRITICAL
push(@backup_fail, $backup);
print_msg("Status: CRITICAL", INFO);
} elsif ($status == 3) {
# UNKNOWN
push(@backup_unknown, $backup);
print_msg("Status: UNKNOWN", INFO);
}
}
my @backup_results = ();
my $backup_result = 0;
if (scalar(@backup_fail) > 0) {
push(@backup_results, scalar(@backup_fail) . " backup" . ((scalar(@backup_fail) == 1) ? "" : "s") . " CRITICAL");
$backup_result = 2;
}
if (scalar(@backup_warning) > 0) {
push(@backup_results, scalar(@backup_warning) . " backup" . ((scalar(@backup_warning) == 1) ? "" : "s") . " WARNING");
if ($backup_result == 0) {
$backup_result = 1;
}
}
if (scalar(@backup_unknown) > 0) {
push(@backup_results, scalar(@backup_unknown) . " backup" . ((scalar(@backup_unknown) == 1) ? "" : "s") . " UNKNOWN");
if ($backup_result == 0) {
$backup_result = 3;
}
}
if (scalar(@backup_ok) > 0) {
push(@backup_results, scalar(@backup_ok) . " backup" . ((scalar(@backup_ok) == 1) ? "" : "s") . " OK");
}
# print to STDOUT instead of print_msg()
print join(", ", @backup_results) . "\n";
exit($backup_result);
}
# status_backup()
#
# retrieve backup status (from cached status files)
#
# parameter:
# - backup task name, from config
# return:
# - return status
# 0: OK
# 1: WARNING
# 2: CRITICAL
# 3: UNKNOWN
# -1: ignore
sub status_backup {
my $backup = shift;
my $backup_type = config_get_key3('backup', $backup, 'type');
my $backup_disabled = config_get_key3('backup', $backup, 'disabled');
my $backup_incremental = config_get_key3('backup', $backup, 'incremental');
my $backup_full_every = config_get_key3('backup', $backup, 'full-every');
my $backup_incremental_every = config_get_key3('backup', $backup, 'incremental-every');
my $backup_keep_full = config_get_key3('backup', $backup, 'keep-full');
my $backup_cd_directory = config_get_key3('backup', $backup, 'backup-cd-directory');
my $backup_this_directory = config_get_key3('backup', $backup, 'backup-this-directory');
my $backup_target = config_get_key3('backup', $backup, 'backup-target');
my $backup_target_sub_directory = config_get_key3('backup', $backup, 'backup-target-sub-directory');
my $backup_include = config_get_key3('backup', $backup, 'include');
my $backup_exclude = config_get_key3('backup', $backup, 'exclude');
my $config_add_time = config_get_key2('config', 'monitoring-add-time');
# pre-flight checks
if (!defined($backup_disabled)) {
$backup_disabled = 'no';
}
if ($backup_disabled eq 'yes' or $backup_disabled eq '1') {
print_msg("task is disabled", INFO);
return -1;
}
if (defined($config_add_time) and length($config_add_time) > 0) {
$config_add_time = parse_duration($config_add_time);
print_msg("add additional $config_add_time seconds as safety", DEBUG);
} else {
$config_add_time = 0;
}
# looks for all $backup*-overview.txt files in cache
my $last_logfile = identify_last_logfile($backup, config_get_keys2('config', 'log-directory'));
if ($last_logfile eq "-1") {
print_msg("error identifying statusfile for backup: $backup", INFO);
return 2;
}
if ($last_logfile eq "") {
print_msg("no statusfile for backup: $backup", INFO);
return 3;
}
print_msg("using logfile $last_logfile for backup $backup", DEBUG);
my $fh = new FileHandle;
if (!open($fh, "<", $last_logfile)) {
print_msg("error opening statusfile ($last_logfile) for backup: $backup", INFO);
return 2;
}
my @file = <$fh>;
close($fh);
my $this_backup_path_info = parse_backup_status(\@file);
my %this_backup_path_info = %$this_backup_path_info;
print_msg("number of full backups: " . $this_backup_path_info{'number_full_backups'}, DEBUG);
if ($this_backup_path_info{'number_full_backups'} > 0) {
print_msg("last full backup: " . $this_backup_path_info{'last_full_backup'}, DEBUG);
if ($this_backup_path_info{'number_incremental_backups'} > 0) {
print_msg("number of incremental backups: " . $this_backup_path_info{'number_incremental_backups'}, DEBUG);
print_msg("last incremental backups: " . $this_backup_path_info{'last_incremental_backup'}, DEBUG);
}
}
if ($this_backup_path_info{'error_in_sets'} == 1) {
print_msg("errors in backup set found, please verify backup!", ERROR);
return 2;
}
# is full backup necessary?
my $need_full_backup = 0;
my $need_incremental_backup = 0;
if ($this_backup_path_info{'number_full_backups'} == 0) {
print_msg("no existing backup", INFO);
$need_full_backup = 1;
} else {
my $backup_full_duration = undef;
eval { $backup_full_duration = parse_duration($backup_full_every); };
if ($@) {
print_msg("full-every ($backup_full_every) is invalid", ERROR);
return 2;
}
print_msg("full backup every $backup_full_duration seconds ($backup_full_every)", DEBUG);
my $time_last_full_backup = str2time($this_backup_path_info{'last_full_backup'});
if (($time_last_full_backup + $backup_full_duration) < time()) {
if (($time_last_full_backup + $backup_full_duration + $config_add_time) < time()) {
print_msg("last full backup is " . duration_exact(time() - ($time_last_full_backup + $backup_full_duration)) . " too old, full backup required", DEBUG);
$need_full_backup = 1;
} else {
print_msg("last full backup is " . duration_exact(time() - ($time_last_full_backup + $backup_full_duration)) . " too old, but still in safety time", DEBUG);
}
} else {
print_msg("" . duration_exact(($time_last_full_backup + $backup_full_duration) - time()) . " until next full backup", DEBUG);
}
}
# if no full backup, is incremental backup allowed?
# if incremental backup allowed, is it necessary?
if ($need_full_backup == 0 and $backup_incremental eq 'yes') {
if ($this_backup_path_info{'number_incremental_backups'} == 0) {
# set last incremental backup timestamp to last full backup timestamp
$this_backup_path_info{'last_incremental_backup'} = $this_backup_path_info{'last_full_backup'};
}
my $backup_incremental_duration = undef;
eval { $backup_incremental_duration = parse_duration($backup_incremental_every); };
if ($@) {
print_msg("incremental-every ($backup_incremental_every) is invalid", ERROR);
return 2;
}
print_msg("incremental backup every $backup_incremental_duration seconds ($backup_incremental_every)", DEBUG);
my $time_last_incremental_backup = str2time($this_backup_path_info{'last_incremental_backup'});
if (($time_last_incremental_backup + $backup_incremental_duration) < time()) {
if (($time_last_incremental_backup + $backup_incremental_duration + $config_add_time) < time()) {
print_msg("last incremental backup is " . duration_exact(time() - ($time_last_incremental_backup + $backup_incremental_duration)) . " too old, incremental backup required", DEBUG);
$need_incremental_backup = 1;
} else {
print_msg("last incremental backup is " . duration_exact(time() - ($time_last_incremental_backup + $backup_incremental_duration)) . " too old, but still in safety time", DEBUG);
}
} else {
print_msg("" . duration_exact(($time_last_incremental_backup + $backup_incremental_duration) - time()) . " until next incremental backup", DEBUG);
}
}
if ($need_full_backup == 1 or $need_incremental_backup == 1) {
return 2;
}
}
# identify_last_logfile()
#
# search latest $backup*-overview.txt file in cache
#
# parameter:
# - backup name
# - cache directory
# return:
# - filename, or "-1"
# note:
# - will not attempt to retrieve status from backup, only the local cache is used
sub identify_last_logfile {
my $backup = shift;
my $dir = shift;
my $dh = new FileHandle;
if (!opendir($dh, $dir)) {
print_msg("cannot open log directory ($dir): $!", ERROR);
return -1;
}
my @found = ();
while (my $file = readdir($dh)) {
if ($file =~ /^$backup\-\d+\-\d+\-overview.txt$/) {
push(@found, $file);
}
}
closedir($dh);
if (scalar(@found) == 0) {
return 0;
}
@found = sort(@found);
my $last = pop(@found);
return $dir . $last;
}
# run_backup()
#
# run a backup task
#
# parameter:
# - backup task name, from config
# return:
# - return status
# 0: error
# 1: OK
# >1: ignore value
# note: don't exit in this function, return back to caller
sub run_backup {
my $backup = shift;
my @execute = ();
my $backup_type = config_get_key3('backup', $backup, 'type');
my $backup_disabled = config_get_key3('backup', $backup, 'disabled');
my $backup_incremental = config_get_key3('backup', $backup, 'incremental');
my $backup_full_every = config_get_key3('backup', $backup, 'full-every');
my $backup_incremental_every = config_get_key3('backup', $backup, 'incremental-every');
my $backup_keep_full = config_get_key3('backup', $backup, 'keep-full');
my $backup_cd_directory = config_get_key3('backup', $backup, 'backup-cd-directory');
my $backup_this_directory = config_get_key3('backup', $backup, 'backup-this-directory');
my $backup_target = config_get_key3('backup', $backup, 'backup-target');
my $backup_target_sub_directory = config_get_key3('backup', $backup, 'backup-target-sub-directory');
my $backup_include = config_get_key3('backup', $backup, 'include');
my $backup_exclude = config_get_key3('backup', $backup, 'exclude');
# pre-flight checks
if (!defined($backup_disabled)) {
$backup_disabled = 'no';
}
if ($backup_disabled eq 'yes' or $backup_disabled eq '1') {
print_msg("task is disabled", INFO);
return 2;
}
# create logfile prefix, so every "duplicity" call can use the same prefix
my ($gtod_seconds, $gtod_microseconds) = gettimeofday();
my $logfile_prefix = sprintf("%s-%010d-%06d", $backup, $gtod_seconds, $gtod_microseconds);
print_msg("logfile names start with: $logfile_prefix", INFO);
$logfile_prefix = config_get_keys2('config', 'log-directory') . $logfile_prefix . '-';
if (!defined($backup_type)) {
print_msg("backup type must be set", ERROR);
return 0;