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syncoid
executable file
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syncoid
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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.
$::VERSION = '2.1.0';
use strict;
use warnings;
use Data::Dumper;
use Getopt::Long qw(:config auto_version auto_help);
use Pod::Usage;
use Time::Local;
use Sys::Hostname;
use Capture::Tiny ':all';
my $mbuffer_size = "16M";
my $pvoptions = "-p -t -e -r -b";
# Blank defaults to use ssh client's default
# TODO: Merge into a single "sshflags" option?
my %args = ('sshkey' => '', 'sshport' => '', 'sshcipher' => '', 'sshoption' => [], 'target-bwlimit' => '', 'source-bwlimit' => '');
GetOptions(\%args, "no-command-checks", "monitor-version", "compress=s", "dumpsnaps", "recursive|r", "sendoptions=s", "recvoptions=s",
"source-bwlimit=s", "target-bwlimit=s", "sshkey=s", "sshport=i", "sshcipher|c=s", "sshoption|o=s@",
"debug", "quiet", "no-stream", "no-sync-snap", "no-resume", "exclude=s@", "skip-parent", "identifier=s",
"no-clone-handling", "no-privilege-elevation", "force-delete", "create-bookmark",
"pv-options=s" => \$pvoptions, "keep-sync-snap", "preserve-recordsize", "mbuffer-size=s" => \$mbuffer_size,
"include-snaps=s@", "exclude-snaps=s@", "exclude-datasets=s@") or pod2usage(2);
my %compressargs = %{compressargset($args{'compress'} || 'default')}; # Can't be done with GetOptions arg, as default still needs to be set
if (defined($args{'exclude'})) {
writelog('WARN', 'The --exclude option is deprecated, please use --exclude-datasets instead');
# If both --exclude and --exclude-datasets are provided, then ignore
# --exclude
if (!defined($args{'exclude-datasets'})) {
$args{'exclude-datasets'} = $args{'exclude'};
}
}
my @sendoptions = ();
if (length $args{'sendoptions'}) {
@sendoptions = parsespecialoptions($args{'sendoptions'});
if (! defined($sendoptions[0])) {
writelog('WARN', "invalid send options!");
pod2usage(2);
exit 127;
}
if (defined $args{'recursive'}) {
foreach my $option(@sendoptions) {
if ($option->{option} eq 'R') {
writelog('WARN', "invalid argument combination, zfs send -R and --recursive aren't compatible!");
pod2usage(2);
exit 127;
}
}
}
}
my @recvoptions = ();
if (length $args{'recvoptions'}) {
@recvoptions = parsespecialoptions($args{'recvoptions'});
if (! defined($recvoptions[0])) {
writelog('WARN', "invalid receive options!");
pod2usage(2);
exit 127;
}
}
# TODO Expand to accept multiple sources?
if (scalar(@ARGV) != 2) {
writelog('WARN', "Source or target not found!");
pod2usage(2);
exit 127;
} else {
$args{'source'} = $ARGV[0];
$args{'target'} = $ARGV[1];
}
# Could possibly merge these into an options function
if (length $args{'source-bwlimit'}) {
$args{'source-bwlimit'} = "-R $args{'source-bwlimit'}";
}
if (length $args{'target-bwlimit'}) {
$args{'target-bwlimit'} = "-r $args{'target-bwlimit'}";
}
$args{'streamarg'} = (defined $args{'no-stream'} ? '-i' : '-I');
my $rawsourcefs = $args{'source'};
my $rawtargetfs = $args{'target'};
my $debug = $args{'debug'};
my $quiet = $args{'quiet'};
my $resume = !$args{'no-resume'};
# for compatibility reasons, older versions used hardcoded command paths
$ENV{'PATH'} = $ENV{'PATH'} . ":/bin:/usr/bin:/sbin";
my $zfscmd = 'zfs';
my $zpoolcmd = 'zpool';
my $sshcmd = 'ssh';
my $pscmd = 'ps';
my $pvcmd = 'pv';
my $mbuffercmd = 'mbuffer';
my $sudocmd = 'sudo';
my $mbufferoptions = "-q -s 128k -m $mbuffer_size 2>/dev/null";
# currently using POSIX compatible command to check for program existence because we aren't depending on perl
# being present on remote machines.
my $checkcmd = 'command -v';
if (length $args{'sshcipher'}) {
$args{'sshcipher'} = "-c $args{'sshcipher'}";
}
if (length $args{'sshport'}) {
$args{'sshport'} = "-p $args{'sshport'}";
}
if (length $args{'sshkey'}) {
$args{'sshkey'} = "-i $args{'sshkey'}";
}
my $sshoptions = join " ", map { "-o " . $_ } @{$args{'sshoption'}}; # deref required
my $identifier = "";
if (length $args{'identifier'}) {
if ($args{'identifier'} !~ /^[a-zA-Z0-9-_:.]+$/) {
# invalid extra identifier
writelog('WARN', "extra identifier contains invalid chars!");
pod2usage(2);
exit 127;
}
$identifier = "$args{'identifier'}_";
}
# figure out if source and/or target are remote.
$sshcmd = "$sshcmd $args{'sshcipher'} $sshoptions $args{'sshport'} $args{'sshkey'}";
writelog('DEBUG', "SSHCMD: $sshcmd");
my ($sourcehost,$sourcefs,$sourceisroot) = getssh($rawsourcefs);
my ($targethost,$targetfs,$targetisroot) = getssh($rawtargetfs);
my $sourcesudocmd = $sourceisroot ? '' : $sudocmd;
my $targetsudocmd = $targetisroot ? '' : $sudocmd;
# figure out whether compression, mbuffering, pv
# are available on source, target, local machines.
# warn user of anything missing, then continue with sync.
my %avail = checkcommands();
my %snaps;
my $exitcode = 0;
## break here to call replication individually so that we ##
## can loop across children separately, for recursive ##
## replication ##
if (!defined $args{'recursive'}) {
syncdataset($sourcehost, $sourcefs, $targethost, $targetfs, undef);
} else {
writelog('DEBUG', "recursive sync of $sourcefs.");
my @datasets = getchilddatasets($sourcehost, $sourcefs, $sourceisroot);
if (!@datasets) {
writelog('CRITICAL', "no datasets found");
@datasets = ();
$exitcode = 2;
}
my @deferred;
foreach my $datasetProperties(@datasets) {
my $dataset = $datasetProperties->{'name'};
my $origin = $datasetProperties->{'origin'};
if ($origin eq "-" || defined $args{'no-clone-handling'}) {
$origin = undef;
} else {
# check if clone source is replicated too
my @values = split(/@/, $origin, 2);
my $srcdataset = $values[0];
my $found = 0;
foreach my $datasetProperties(@datasets) {
if ($datasetProperties->{'name'} eq $srcdataset) {
$found = 1;
last;
}
}
if ($found == 0) {
# clone source is not replicated, do a full replication
$origin = undef;
} else {
# clone source is replicated, defer until all non clones are replicated
push @deferred, $datasetProperties;
next;
}
}
$dataset =~ s/\Q$sourcefs\E//;
chomp $dataset;
my $childsourcefs = $sourcefs . $dataset;
my $childtargetfs = $targetfs . $dataset;
syncdataset($sourcehost, $childsourcefs, $targethost, $childtargetfs, $origin);
}
# replicate cloned datasets and if this is the initial run, recreate them on the target
foreach my $datasetProperties(@deferred) {
my $dataset = $datasetProperties->{'name'};
my $origin = $datasetProperties->{'origin'};
$dataset =~ s/\Q$sourcefs\E//;
chomp $dataset;
my $childsourcefs = $sourcefs . $dataset;
my $childtargetfs = $targetfs . $dataset;
syncdataset($sourcehost, $childsourcefs, $targethost, $childtargetfs, $origin);
}
}
# close SSH sockets for master connections as applicable
if ($sourcehost ne '') {
open FH, "$sshcmd $sourcehost -O exit 2>&1 |";
close FH;
}
if ($targethost ne '') {
open FH, "$sshcmd $targethost -O exit 2>&1 |";
close FH;
}
exit $exitcode;
##############################################################################
##############################################################################
##############################################################################
##############################################################################
sub getchilddatasets {
my ($rhost,$fs,$isroot,%snaps) = @_;
my $mysudocmd;
my $fsescaped = escapeshellparam($fs);
if ($isroot) { $mysudocmd = ''; } else { $mysudocmd = $sudocmd; }
if ($rhost ne '') {
$rhost = "$sshcmd $rhost";
# double escaping needed
$fsescaped = escapeshellparam($fsescaped);
}
my $getchildrencmd = "$rhost $mysudocmd $zfscmd list -o name,origin -t filesystem,volume -Hr $fsescaped |";
writelog('DEBUG', "getting list of child datasets on $fs using $getchildrencmd...");
if (! open FH, $getchildrencmd) {
die "ERROR: list command failed!\n";
}
my @children;
my $first = 1;
DATASETS: while(<FH>) {
chomp;
if (defined $args{'skip-parent'} && $first eq 1) {
# parent dataset is the first element
$first = 0;
next;
}
my ($dataset, $origin) = /^([^\t]+)\t([^\t]+)/;
if (defined $args{'exclude-datasets'}) {
my $excludes = $args{'exclude-datasets'};
foreach (@$excludes) {
if ($dataset =~ /$_/) {
writelog('DEBUG', "excluded $dataset because of $_");
next DATASETS;
}
}
}
my %properties;
$properties{'name'} = $dataset;
$properties{'origin'} = $origin;
push @children, \%properties;
}
close FH;
return @children;
}
sub syncdataset {
my ($sourcehost, $sourcefs, $targethost, $targetfs, $origin, $skipsnapshot) = @_;
my $stdout;
my $exit;
writelog('DEBUG', "syncing source $sourcefs to target $targetfs.");
my ($sync, $error) = getzfsvalue($sourcehost,$sourcefs,$sourceisroot,'syncoid:sync');
if (!defined $sync) {
# zfs already printed the corresponding error
if ($error =~ /\bdataset does not exist\b/) {
writelog('WARN', "Skipping dataset (dataset no longer exists): $sourcefs...");
return 0;
}
else {
# print the error out and set exit code
writelog('CRITICAL', "$error");
if ($exitcode < 2) { $exitcode = 2 }
}
return 0;
}
if ($sync eq 'true' || $sync eq '-' || $sync eq '') {
# empty is handled the same as unset (aka: '-')
# definitely sync this dataset - if a host is called 'true' or '-', then you're special
} elsif ($sync eq 'false') {
writelog('INFO', "Skipping dataset (syncoid:sync=false): $sourcefs...");
return 0;
} else {
my $hostid = hostname();
my @hosts = split(/,/,$sync);
if (!(grep $hostid eq $_, @hosts)) {
writelog('INFO', "Skipping dataset (syncoid:sync doesn't include $hostid): $sourcefs...");
return 0;
}
}
# make sure target is not currently in receive.
if (iszfsbusy($targethost,$targetfs,$targetisroot)) {
writelog('WARN', "Cannot sync now: $targetfs is already target of a zfs receive process.");
if ($exitcode < 1) { $exitcode = 1; }
return 0;
}
# does the target filesystem exist yet?
my $targetexists = targetexists($targethost,$targetfs,$targetisroot);
my $receivetoken;
if ($resume) {
if ($targetexists) {
# check remote dataset for receive resume token (interrupted receive)
$receivetoken = getreceivetoken($targethost,$targetfs,$targetisroot);
if (defined($receivetoken)) {
writelog('DEBUG', "got receive resume token: $receivetoken: ");
}
}
}
my $newsyncsnap;
# skip snapshot checking/creation in case of resumed receive
if (!defined($receivetoken)) {
# build hashes of the snaps on the source and target filesystems.
%snaps = getsnaps('source',$sourcehost,$sourcefs,$sourceisroot);
if ($targetexists) {
my %targetsnaps = getsnaps('target',$targethost,$targetfs,$targetisroot);
my %sourcesnaps = %snaps;
%snaps = (%sourcesnaps, %targetsnaps);
}
if (defined $args{'dumpsnaps'}) {
writelog('INFO', "merged snapshot list of $targetfs: ");
dumphash(\%snaps);
}
if (!defined $args{'no-sync-snap'} && !defined $skipsnapshot) {
# create a new syncoid snapshot on the source filesystem.
$newsyncsnap = newsyncsnap($sourcehost,$sourcefs,$sourceisroot);
if (!$newsyncsnap) {
# we already whined about the error
return 0;
}
# Don't send the sync snap if it's filtered out by --exclude-snaps or
# --include-snaps
if (!snapisincluded($newsyncsnap)) {
$newsyncsnap = getnewestsnapshot($sourcehost,$sourcefs,$sourceisroot);
if ($newsyncsnap eq 0) {
writelog('WARN', "CRITICAL: no snapshots exist on source $sourcefs, and you asked for --no-sync-snap.");
if ($exitcode < 1) { $exitcode = 1; }
return 0;
}
}
} else {
# we don't want sync snapshots created, so use the newest snapshot we can find.
$newsyncsnap = getnewestsnapshot($sourcehost,$sourcefs,$sourceisroot);
if ($newsyncsnap eq 0) {
writelog('WARN', "CRITICAL: no snapshots exist on source $sourcefs, and you asked for --no-sync-snap.");
if ($exitcode < 1) { $exitcode = 1; }
return 0;
}
}
}
my $newsyncsnapescaped = escapeshellparam($newsyncsnap);
# there is currently (2014-09-01) a bug in ZFS on Linux
# that causes readonly to always show on if it's EVER
# been turned on... even when it's off... unless and
# until the filesystem is zfs umounted and zfs remounted.
# we're going to do the right thing anyway.
# dyking this functionality out for the time being due to buggy mount/unmount behavior
# with ZFS on Linux (possibly OpenZFS in general) when setting/unsetting readonly.
#my $originaltargetreadonly;
# sync 'em up.
if (! $targetexists) {
# do an initial sync from the oldest source snapshot
# THEN do an -I to the newest
if (!defined ($args{'no-stream'}) ) {
writelog('DEBUG', "target $targetfs does not exist. Finding oldest available snapshot on source $sourcefs ...");
} else {
writelog('DEBUG', "target $targetfs does not exist, and --no-stream selected. Finding newest available snapshot on source $sourcefs ...");
}
my $oldestsnap = getoldestsnapshot(\%snaps);
if (! $oldestsnap) {
if (defined ($args{'no-sync-snap'}) ) {
# we already whined about the missing snapshots
return 0;
}
# getoldestsnapshot() returned false, so use new sync snapshot
writelog('DEBUG', "getoldestsnapshot() returned false, so using $newsyncsnap.");
$oldestsnap = $newsyncsnap;
}
# if --no-stream is specified, our full needs to be the newest snapshot, not the oldest.
if (defined $args{'no-stream'}) {
if (defined ($args{'no-sync-snap'}) ) {
$oldestsnap = getnewestsnapshot(\%snaps);
} else {
$oldestsnap = $newsyncsnap;
}
}
my $ret;
if (defined $origin) {
writelog('INFO', "Clone is recreated on target $targetfs based on $origin");
($ret, $stdout) = syncclone($sourcehost, $sourcefs, $origin, $targethost, $targetfs, $oldestsnap);
if ($ret) {
writelog('INFO', "clone creation failed, trying ordinary replication as fallback");
syncdataset($sourcehost, $sourcefs, $targethost, $targetfs, undef, 1);
return 0;
}
} else {
if (!defined ($args{'no-stream'}) ) {
writelog('INFO', "Sending oldest full snapshot $sourcefs\@$oldestsnap to new target filesystem:");
} else {
writelog('INFO', "--no-stream selected; sending newest full snapshot $sourcefs\@$oldestsnap to new target filesystem:");
}
($ret, $stdout) = syncfull($sourcehost, $sourcefs, $targethost, $targetfs, $oldestsnap);
}
if ($ret) {
if ($exitcode < 2) { $exitcode = 2; }
return 0;
}
# now do an -I to the new sync snapshot, assuming there were any snapshots
# other than the new sync snapshot to begin with, of course - and that we
# aren't invoked with --no-stream, in which case a full of the newest snap
# available was all we needed to do
if (!defined ($args{'no-stream'}) && ($oldestsnap ne $newsyncsnap) ) {
# get current readonly status of target, then set it to on during sync
# dyking this functionality out for the time being due to buggy mount/unmount behavior
# with ZFS on Linux (possibly OpenZFS in general) when setting/unsetting readonly.
# $originaltargetreadonly = getzfsvalue($targethost,$targetfs,$targetisroot,'readonly');
# setzfsvalue($targethost,$targetfs,$targetisroot,'readonly','on');
writelog('INFO', "Updating new target filesystem with incremental $sourcefs\@$oldestsnap ... $newsyncsnap:");
(my $ret, $stdout) = syncincremental($sourcehost, $sourcefs, $targethost, $targetfs, $oldestsnap, $newsyncsnap, 0);
if ($ret != 0) {
if ($exitcode < 1) { $exitcode = 1; }
return 0;
}
# restore original readonly value to target after sync complete
# dyking this functionality out for the time being due to buggy mount/unmount behavior
# with ZFS on Linux (possibly OpenZFS in general) when setting/unsetting readonly.
# setzfsvalue($targethost,$targetfs,$targetisroot,'readonly',$originaltargetreadonly);
}
} else {
# resume interrupted receive if there is a valid resume $token
# and because this will ony resume the receive to the next
# snapshot, do a normal sync after that
if (defined($receivetoken)) {
($exit, $stdout) = syncresume($sourcehost, $sourcefs, $targethost, $targetfs, $receivetoken);
$exit == 0 or do {
if (
$stdout =~ /\Qused in the initial send no longer exists\E/ ||
$stdout =~ /incremental source [0-9xa-f]+ no longer exists/
) {
writelog('WARN', "resetting partially receive state because the snapshot source no longer exists");
resetreceivestate($targethost,$targetfs,$targetisroot);
# do an normal sync cycle
return syncdataset($sourcehost, $sourcefs, $targethost, $targetfs, $origin);
} else {
if ($exitcode < 2) { $exitcode = 2; }
return 0;
}
};
# a resumed transfer will only be done to the next snapshot,
# so do an normal sync cycle
return syncdataset($sourcehost, $sourcefs, $targethost, $targetfs, undef);
}
# find most recent matching snapshot and do an -I
# to the new snapshot
# get current readonly status of target, then set it to on during sync
# dyking this functionality out for the time being due to buggy mount/unmount behavior
# with ZFS on Linux (possibly OpenZFS in general) when setting/unsetting readonly.
# $originaltargetreadonly = getzfsvalue($targethost,$targetfs,$targetisroot,'readonly');
# setzfsvalue($targethost,$targetfs,$targetisroot,'readonly','on');
my $targetsize = getzfsvalue($targethost,$targetfs,$targetisroot,'-p used');
my $bookmark = 0;
my $bookmarkcreation = 0;
my $matchingsnap = getmatchingsnapshot($sourcefs, $targetfs, \%snaps);
if (! $matchingsnap) {
# no matching snapshots, check for bookmarks as fallback
my %bookmarks = getbookmarks($sourcehost,$sourcefs,$sourceisroot);
# check for matching guid of source bookmark and target snapshot (oldest first)
foreach my $snap ( sort { $snaps{'target'}{$b}{'creation'}<=>$snaps{'target'}{$a}{'creation'} } keys %{ $snaps{'target'} }) {
my $guid = $snaps{'target'}{$snap}{'guid'};
if (defined $bookmarks{$guid}) {
# found a match
$bookmark = $bookmarks{$guid}{'name'};
$bookmarkcreation = $bookmarks{$guid}{'creation'};
$matchingsnap = $snap;
last;
}
}
if (! $bookmark) {
if ($args{'force-delete'}) {
writelog('INFO', "Removing $targetfs because no matching snapshots were found");
my $rcommand = '';
my $mysudocmd = '';
my $targetfsescaped = escapeshellparam($targetfs);
if ($targethost ne '') { $rcommand = "$sshcmd $targethost"; }
if (!$targetisroot) { $mysudocmd = $sudocmd; }
my $prunecmd = "$mysudocmd $zfscmd destroy -r $targetfsescaped; ";
if ($targethost ne '') {
$prunecmd = escapeshellparam($prunecmd);
}
my $ret = system("$rcommand $prunecmd");
if ($ret != 0) {
writelog('WARN', "$rcommand $prunecmd failed: $?");
} else {
# redo sync and skip snapshot creation (already taken)
return syncdataset($sourcehost, $sourcefs, $targethost, $targetfs, undef, 1);
}
}
# if we got this far, we failed to find a matching snapshot/bookmark.
if ($exitcode < 2) { $exitcode = 2; }
my $msg = <<~"EOT";
Target $targetfs exists but has no snapshots matching with $sourcefs!
Replication to target would require destroying existing
target. Cowardly refusing to destroy your existing target.
EOT
writelog('CRITICAL', $msg);
# experience tells me we need a mollyguard for people who try to
# zfs create targetpool/targetsnap ; syncoid sourcepool/sourcesnap targetpool/targetsnap ...
if ( $targetsize < (64*1024*1024) ) {
$msg = <<~"EOT";
NOTE: Target $targetfs dataset is < 64MB used - did you mistakenly run
`zfs create $args{'target'}` on the target? ZFS initial
replication must be to a NON EXISTENT DATASET, which will
then be CREATED BY the initial replication process.
EOT
}
# return false now in case more child datasets need replication.
return 0;
}
}
# make sure target is (still) not currently in receive.
if (iszfsbusy($targethost,$targetfs,$targetisroot)) {
writelog('WARN', "Cannot sync now: $targetfs is already target of a zfs receive process.");
if ($exitcode < 1) { $exitcode = 1; }
return 0;
}
if ($matchingsnap eq $newsyncsnap) {
# barf some text but don't touch the filesystem
writelog('INFO', "no snapshots on source newer than $newsyncsnap on target. Nothing to do, not syncing.");
return 0;
} else {
my $matchingsnapescaped = escapeshellparam($matchingsnap);
my $nextsnapshot = 0;
if ($bookmark) {
my $bookmarkescaped = escapeshellparam($bookmark);
if (!defined $args{'no-stream'}) {
# if intermediate snapshots are needed we need to find the next oldest snapshot,
# do an replication to it and replicate as always from oldest to newest
# because bookmark sends doesn't support intermediates directly
foreach my $snap ( sort { $snaps{'source'}{$a}{'creation'}<=>$snaps{'source'}{$b}{'creation'} } keys %{ $snaps{'source'} }) {
if ($snaps{'source'}{$snap}{'creation'} >= $bookmarkcreation) {
$nextsnapshot = $snap;
last;
}
}
}
if ($nextsnapshot) {
($exit, $stdout) = syncbookmark($sourcehost, $sourcefs, $targethost, $targetfs, $bookmark, $nextsnapshot);
$exit == 0 or do {
if (!$resume && $stdout =~ /\Qcontains partially-complete state\E/) {
writelog('WARN', "resetting partially receive state");
resetreceivestate($targethost,$targetfs,$targetisroot);
(my $ret) = syncbookmark($sourcehost, $sourcefs, $targethost, $targetfs, $bookmark, $nextsnapshot);
$ret == 0 or do {
if ($exitcode < 2) { $exitcode = 2; }
return 0;
}
} else {
if ($exitcode < 2) { $exitcode = 2; }
return 0;
}
};
$matchingsnap = $nextsnapshot;
$matchingsnapescaped = escapeshellparam($matchingsnap);
} else {
($exit, $stdout) = syncbookmark($sourcehost, $sourcefs, $targethost, $targetfs, $bookmark, $newsyncsnap);
$exit == 0 or do {
if (!$resume && $stdout =~ /\Qcontains partially-complete state\E/) {
writelog('WARN', "resetting partially receive state");
resetreceivestate($targethost,$targetfs,$targetisroot);
(my $ret) = syncbookmark($sourcehost, $sourcefs, $targethost, $targetfs, $bookmark, $newsyncsnap);
$ret == 0 or do {
if ($exitcode < 2) { $exitcode = 2; }
return 0;
}
} else {
if ($exitcode < 2) { $exitcode = 2; }
return 0;
}
};
}
}
# do a normal replication if bookmarks aren't used or if previous
# bookmark replication was only done to the next oldest snapshot
if (!$bookmark || $nextsnapshot) {
if ($matchingsnap eq $newsyncsnap) {
# edge case: bookmark replication used the latest snapshot
return 0;
}
($exit, $stdout) = syncincremental($sourcehost, $sourcefs, $targethost, $targetfs, $matchingsnap, $newsyncsnap, defined($args{'no-stream'}));
$exit == 0 or do {
# FreeBSD reports "dataset is busy" instead of "contains partially-complete state"
if (!$resume && ($stdout =~ /\Qcontains partially-complete state\E/ || $stdout =~ /\Qdataset is busy\E/)) {
writelog('WARN', "resetting partially receive state");
resetreceivestate($targethost,$targetfs,$targetisroot);
(my $ret) = syncincremental($sourcehost, $sourcefs, $targethost, $targetfs, $matchingsnap, $newsyncsnap, defined($args{'no-stream'}));
$ret == 0 or do {
if ($exitcode < 2) { $exitcode = 2; }
return 0;
}
} else {
if ($exitcode < 2) { $exitcode = 2; }
return 0;
}
};
}
# restore original readonly value to target after sync complete
# dyking this functionality out for the time being due to buggy mount/unmount behavior
# with ZFS on Linux (possibly OpenZFS in general) when setting/unsetting readonly.
#setzfsvalue($targethost,$targetfs,$targetisroot,'readonly',$originaltargetreadonly);
}
}
if (defined $args{'no-sync-snap'}) {
if (defined $args{'create-bookmark'}) {
my $ret = createbookmark($sourcehost, $sourcefs, $newsyncsnap, $newsyncsnap);
$ret == 0 or do {
# fallback: assume nameing conflict and try again with guid based suffix
my $guid = $snaps{'source'}{$newsyncsnap}{'guid'};
$guid = substr($guid, 0, 6);
writelog('INFO', "bookmark creation failed, retrying with guid based suffix ($guid)...");
my $ret = createbookmark($sourcehost, $sourcefs, $newsyncsnap, "$newsyncsnap$guid");
$ret == 0 or do {
if ($exitcode < 2) { $exitcode = 2; }
return 0;
}
};
}
} else {
if (!defined $args{'keep-sync-snap'}) {
# prune obsolete sync snaps on source and target (only if this run created ones).
pruneoldsyncsnaps($sourcehost,$sourcefs,$newsyncsnap,$sourceisroot,keys %{ $snaps{'source'}});
pruneoldsyncsnaps($targethost,$targetfs,$newsyncsnap,$targetisroot,keys %{ $snaps{'target'}});
}
}
} # end syncdataset()
# Return codes:
# 0 - ZFS send/receive completed without errors
# 1 - ZFS target is currently in receive
# 2 - Critical error encountered when running the ZFS send/receive command
sub runsynccmd {
my ($sourcehost, $sourcefs, $sendsource, $targethost, $targetfs, $pvsize) = @_;
my $sourcefsescaped = escapeshellparam($sourcefs);
my $targetfsescaped = escapeshellparam($targetfs);
my $disp_pvsize = $pvsize == 0 ? 'UNKNOWN' : readablebytes($pvsize);
my $sendoptions;
if ($sendsource =~ /^-t /) {
writelog('INFO', "Resuming interrupted zfs send/receive from $sourcefs to $targetfs (~ $disp_pvsize remaining):");
$sendoptions = getoptionsline(\@sendoptions, ('P','e','v','w'));
} elsif ($sendsource =~ /#/) {
$sendoptions = getoptionsline(\@sendoptions, ('L','c','e','w'));
} else {
$sendoptions = getoptionsline(\@sendoptions, ('D','L','P','R','c','e','h','p','v','w'));
}
my $recvoptions = getoptionsline(\@recvoptions, ('h','o','x','u','v'));
# save state of interrupted receive stream
if ($resume) { $recvoptions .= ' -s'; }
# if no rollbacks are allowed, disable forced receive
if (!defined $args{'no-rollback'}) { $recvoptions .= ' -F'; }
if (defined $args{'preserve-recordsize'}) {
my $type = getzfsvalue($sourcehost,$sourcefs,$sourceisroot,'type');
if ($type eq "filesystem") {
my $recordsize = getzfsvalue($sourcehost,$sourcefs,$sourceisroot,'recordsize');
$recvoptions .= " -o recordsize=$recordsize"
}
}
my $sendcmd = "$sourcesudocmd $zfscmd send $sendoptions $sendsource";
my $recvcmd = "$targetsudocmd $zfscmd receive $recvoptions $targetfsescaped";
my $synccmd = buildsynccmd($sendcmd,$recvcmd,$pvsize,$sourceisroot,$targetisroot);
writelog('INFO', "Sync size: ~$disp_pvsize");
writelog('DEBUG', "$synccmd");
# make sure target is (still) not currently in receive.
if (iszfsbusy($targethost,$targetfs,$targetisroot)) {
writelog('WARN', "Cannot sync now: $targetfs is already target of a zfs receive process.");
return (1, '');
}
my $stdout;
my $ret;
if ($pvsize == 0) {
($stdout, $ret) = tee_stderr {
system("$synccmd");
};
} else {
($stdout, $ret) = tee_stdout {
system("$synccmd");
};
}
if ($ret != 0) {
writelog('CRITICAL', "$synccmd failed: $?");
return (2, $stdout);
} else {
return 0;
}
} # end runsendcmd()
sub syncfull {
my ($sourcehost, $sourcefs, $targethost, $targetfs, $snapname) = @_;
my $sourcefsescaped = escapeshellparam($sourcefs);
my $snapescaped = escapeshellparam($snapname);
my $sendsource = "$sourcefsescaped\@$snapescaped";
my $pvsize = getsendsize($sourcehost,"$sourcefs\@$snapname",0,$sourceisroot);
return runsynccmd($sourcehost, $sourcefs, $sendsource, $targethost, $targetfs, $pvsize);
} # end syncfull()
sub syncincremental {
my ($sourcehost, $sourcefs, $targethost, $targetfs, $fromsnap, $tosnap, $skipintermediate) = @_;
my $streamarg = '-I';
if ($skipintermediate) {
$streamarg = '-i';
}
# If this is an -I sync but we're filtering snaps, then we should do a series
# of -i syncs instead.
if (!$skipintermediate) {
if (defined($args{'exclude-snaps'}) || defined($args{'include-snaps'})) {
writelog('INFO', '--no-stream is omitted but snaps are filtered. Simulating -I with filtered snaps');
# Get the snap names between $fromsnap and $tosnap
my @intsnaps = ();
my $inrange = 0;
foreach my $testsnap (sort { $snaps{'source'}{$a}{'creation'}<=>$snaps{'source'}{$b}{'creation'} } keys %{ $snaps{'source'} }) {
if ($testsnap eq $fromsnap) { $inrange = 1; }
if ($inrange) { push(@intsnaps, $testsnap); }
if ($testsnap eq $tosnap) { last; }
}
# If we created a new sync snap, it won't be in @intsnaps yet
if ($intsnaps[-1] ne $tosnap) {
# Make sure that the sync snap isn't filtered out by --include-snaps or --exclude-snaps
if (snapisincluded($tosnap)) {
push(@intsnaps, $tosnap);
}
}
foreach my $i (0..(scalar(@intsnaps) - 2)) {
my $snapa = $intsnaps[$i];
my $snapb = $intsnaps[$i + 1];
writelog('INFO', "Performing an incremental sync between '$snapa' and '$snapb'");
syncincremental($sourcehost, $sourcefs, $targethost, $targetfs, $snapa, $snapb, 1) == 0 or return $?;
}
# Return after finishing the -i syncs so that we don't try to do another -I
return 0;
}
}
my $sourcefsescaped = escapeshellparam($sourcefs);
my $fromsnapescaped = escapeshellparam($fromsnap);
my $tosnapescaped = escapeshellparam($tosnap);
my $sendsource = "$streamarg $sourcefsescaped\@$fromsnapescaped $sourcefsescaped\@$tosnapescaped";
my $pvsize = getsendsize($sourcehost,"$sourcefs\@$fromsnap","$sourcefs\@$tosnap",$sourceisroot);
return runsynccmd($sourcehost, $sourcefs, $sendsource, $targethost, $targetfs, $pvsize);
} # end syncincremental()
sub syncclone {
my ($sourcehost, $sourcefs, $origin, $targethost, $targetfs, $tosnap) = @_;
my $sourcefsescaped = escapeshellparam($sourcefs);
my $originescaped = escapeshellparam($origin);
my $tosnapescaped = escapeshellparam($tosnap);
my $sendsource = "-i $originescaped $sourcefsescaped\@$tosnapescaped";
my $pvsize = getsendsize($sourcehost,$origin,"$sourcefs\@$tosnap",$sourceisroot);
return runsynccmd($sourcehost, $sourcefs, $sendsource, $targethost, $targetfs, $pvsize);
} # end syncclone()
sub syncresume {
my ($sourcehost, $sourcefs, $targethost, $targetfs, $receivetoken) = @_;
my $sendsource = "-t $receivetoken";
my $pvsize = getsendsize($sourcehost,"","",$sourceisroot,$receivetoken);
return runsynccmd($sourcehost, $sourcefs, $sendsource, $targethost, $targetfs, $pvsize);
} # end syncresume()
sub syncbookmark {
my ($sourcehost, $sourcefs, $targethost, $targetfs, $bookmark, $tosnap) = @_;
my $sourcefsescaped = escapeshellparam($sourcefs);
my $bookmarkescaped = escapeshellparam($bookmark);
my $tosnapescaped = escapeshellparam($tosnap);
my $sendsource = "-i $sourcefsescaped#$bookmarkescaped $sourcefsescaped\@$tosnapescaped";
return runsynccmd($sourcehost, $sourcefs, $sendsource, $targethost, $targetfs, 0);
} # end syncbookmark
sub createbookmark {
my ($sourcehost, $sourcefs, $snapname, $bookmark) = @_;
my $sourcefsescaped = escapeshellparam($sourcefs);
my $bookmarkescaped = escapeshellparam($bookmark);
my $snapnameescaped = escapeshellparam($snapname);
my $cmd = "$sourcesudocmd $zfscmd bookmark $sourcefsescaped\@$snapname $sourcefsescaped\#$bookmark";
if ($sourcehost ne '') {
$cmd = "$sshcmd $sourcehost " . escapeshellparam($cmd);
}
writelog('DEBUG', "$cmd");
return system($cmd);
} # end createbookmark()
sub compressargset {
my ($value) = @_;
my $DEFAULT_COMPRESSION = 'lzo';
my %COMPRESS_ARGS = (
'none' => {
rawcmd => '',
args => '',
decomrawcmd => '',
decomargs => '',
},
'gzip' => {
rawcmd => 'gzip',
args => '-3',
decomrawcmd => 'zcat',
decomargs => '',
},
'pigz-fast' => {
rawcmd => 'pigz',
args => '-3',
decomrawcmd => 'pigz',
decomargs => '-dc',
},
'pigz-slow' => {
rawcmd => 'pigz',
args => '-9',
decomrawcmd => 'pigz',
decomargs => '-dc',
},
'zstd-fast' => {
rawcmd => 'zstd',
args => '-3',
decomrawcmd => 'zstd',
decomargs => '-dc',
},
'zstd-slow' => {
rawcmd => 'zstd',
args => '-19',
decomrawcmd => 'zstd',
decomargs => '-dc',
},
'xz' => {
rawcmd => 'xz',
args => '',
decomrawcmd => 'xz',
decomargs => '-d',
},
'lzo' => {
rawcmd => 'lzop',
args => '',
decomrawcmd => 'lzop',
decomargs => '-dfc',
},
'lz4' => {
rawcmd => 'lz4',
args => '',
decomrawcmd => 'lz4',
decomargs => '-dc',
},
);
if ($value eq 'default') {
$value = $DEFAULT_COMPRESSION;
} elsif (!(grep $value eq $_, ('gzip', 'pigz-fast', 'pigz-slow', 'zstd-fast', 'zstd-slow', 'lz4', 'xz', 'lzo', 'default', 'none'))) {
writelog('WARN', "Unrecognised compression value $value, defaulting to $DEFAULT_COMPRESSION");
$value = $DEFAULT_COMPRESSION;
}
my %comargs = %{$COMPRESS_ARGS{$value}}; # copy
$comargs{'compress'} = $value;
$comargs{'cmd'} = "$comargs{'rawcmd'} $comargs{'args'}";
$comargs{'decomcmd'} = "$comargs{'decomrawcmd'} $comargs{'decomargs'}";
return \%comargs;
}
sub checkcommands {
# make sure compression, mbuffer, and pv are available on
# source, target, and local hosts as appropriate.
my %avail;
my $sourcessh;
my $targetssh;