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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 $pvoptions = "-p -t -e -r -b";
# Blank defaults to use ssh client's default
# TODO: Merge into a single "sshflags" option?
my %args = ('sshkey' => '', 'sshport' => '', 'sshcipher' => '', 'sshoption' => [], 'target-bwlimit' => '', 'source-bwlimit' => '');
GetOptions(\%args, "no-command-checks", "monitor-version", "compress=s", "dumpsnaps", "recursive|r", "sendoptions=s", "recvoptions=s",
"source-bwlimit=s", "target-bwlimit=s", "sshkey=s", "sshport=i", "sshcipher|c=s", "sshoption|o=s@",
"debug", "quiet", "no-stream", "no-sync-snap", "no-resume", "exclude=s@", "skip-parent", "identifier=s",
"no-clone-handling", "no-privilege-elevation", "force-delete", "no-clone-rollback", "no-rollback",
"create-bookmark", "pv-options=s" => \$pvoptions, "keep-sync-snap", "preserve-recordsize",
"mbuffer-size=s" => \$mbuffer_size) or pod2usage(2);
my %compressargs = %{compressargset($args{'compress'} || 'default')}; # Can't be done with GetOptions arg, as default still needs to be set
my @sendoptions = ();
if (length $args{'sendoptions'}) {
@sendoptions = parsespecialoptions($args{'sendoptions'});
if (! defined($sendoptions[0])) {
warn "invalid send options!";
pod2usage(2);
exit 127;
}
if (defined $args{'recursive'}) {
foreach my $option(@sendoptions) {
if ($option->{option} eq 'R') {
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])) {
warn "invalid receive options!";
pod2usage(2);
exit 127;
}
}
# TODO Expand to accept multiple sources?
if (scalar(@ARGV) != 2) {
print("Source or target not found!\n");
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
print("CRITICAL: extra identifier contains invalid chars!\n");
pod2usage(2);
exit 127;
}
$identifier = "$args{'identifier'}_";
}
# figure out if source and/or target are remote.
$sshcmd = "$sshcmd $args{'sshcipher'} $sshoptions $args{'sshport'} $args{'sshkey'}";
if ($debug) { print "DEBUG: SSHCMD: $sshcmd\n"; }
my ($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, $targetfs, undef);
} else {
if ($debug) { print "DEBUG: recursive sync of $sourcefs.\n"; }
my @datasets = getchilddatasets($sourcehost, $sourcefs, $sourceisroot);
if (!@datasets) {
warn "CRITICAL ERROR: no datasets found";
@datasets = ();
$exitcode = 3;
}
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 . $dataset;
# print "syncdataset($sourcehost, $childsourcefs, $targethost, $childtargetfs); \n";
syncdataset($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 $fsescaped |";
if ($debug) { print "DEBUG: getting list of child datasets on $fs using $getchildrencmd...\n"; }
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'}) {
my $excludes = $args{'exclude'};
foreach (@$excludes) {
if ($dataset =~ /$_/) {
if ($debug) { print "DEBUG: excluded $dataset because of $_\n"; }
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;
my $sourcefsescaped = escapeshellparam($sourcefs);
my $targetfsescaped = escapeshellparam($targetfs);
# if no rollbacks are allowed, disable forced receive
my $forcedrecv = "-F";
if (defined $args{'no-rollback'}) {
$forcedrecv = "";
}
if ($debug) { print "DEBUG: syncing source $sourcefs to target $targetfs.\n"; }
my ($sync, $error) = getzfsvalue($sourcehost,$sourcefs,$sourceisroot,'syncoid:sync');
if (!defined $sync) {
# zfs already printed the corresponding error
if ($error =~ /\bdataset does not exist\b/) {
if (!$quiet) { print "WARN Skipping dataset (dataset no longer exists): $sourcefs...\n"; }
return 0;
}
else {
# print the error out and set exit code
print "ERROR: $error\n";
if ($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') {
if (!$quiet) { print "INFO: Skipping dataset (syncoid:sync=false): $sourcefs...\n"; }
return 0;
} else {
my $hostid = hostname();
my @hosts = split(/,/,$sync);
if (!(grep $hostid eq $_, @hosts)) {
if (!$quiet) { print "INFO: Skipping dataset (syncoid:sync doesn't include $hostid): $sourcefs...\n"; }
return 0;
}
}
# make sure target is not currently in receive.
if (iszfsbusy($targethost,$targetfs,$targetisroot)) {
warn "Cannot sync now: $targetfs is already target of a zfs receive process.\n";
if ($exitcode < 1) { $exitcode = 1; }
return 0;
}
# does the target filesystem exist yet?
my $targetexists = targetexists($targethost,$targetfs,$targetisroot);
my $receiveextraargs = "";
my $receivetoken;
if ($resume) {
# save state of interrupted receive stream
$receiveextraargs = "-s";
if ($targetexists) {
# check remote dataset for receive resume token (interrupted receive)
$receivetoken = getreceivetoken($targethost,$targetfs,$targetisroot);
if ($debug && defined($receivetoken)) {
print "DEBUG: got receive resume token: $receivetoken: \n";
}
}
}
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'}) {
print "merged snapshot list of $targetfs: \n";
dumphash(\%snaps);
print "\n\n\n";
}
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;
}
} 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) {
warn "CRITICAL: no snapshots exist on source $sourcefs, and you asked for --no-sync-snap.\n";
if ($exitcode < 3) { $exitcode = 3; }
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;
my $sendoptions = getoptionsline(\@sendoptions, ('D','L','P','R','c','e','h','p','v','w'));
my $recvoptions = getoptionsline(\@recvoptions, ('h','o','x','u','v'));
# sync 'em up.
if (! $targetexists) {
# do an initial sync from the oldest source snapshot
# THEN do an -I to the newest
if ($debug) {
if (!defined ($args{'no-stream'}) ) {
print "DEBUG: target $targetfs does not exist. Finding oldest available snapshot on source $sourcefs ...\n";
} else {
print "DEBUG: target $targetfs does not exist, and --no-stream selected. Finding newest available snapshot on source $sourcefs ...\n";
}
}
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
if ($debug) { print "DEBUG: getoldestsnapshot() returned false, so using $newsyncsnap.\n"; }
$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 $oldestsnapescaped = escapeshellparam($oldestsnap);
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 $sourcefsescaped\@$oldestsnapescaped";
my $recvcmd = "$targetsudocmd $zfscmd receive $recvoptions $receiveextraargs $forcedrecv $targetfsescaped";
my $pvsize;
if (defined $origin) {
my $originescaped = escapeshellparam($origin);
$sendcmd = "$sourcesudocmd $zfscmd send $sendoptions -i $originescaped $sourcefsescaped\@$oldestsnapescaped";
my $streamargBackup = $args{'streamarg'};
$args{'streamarg'} = "-i";
$pvsize = getsendsize($sourcehost,$origin,"$sourcefs\@$oldestsnap",$sourceisroot);
$args{'streamarg'} = $streamargBackup;
} else {
$pvsize = getsendsize($sourcehost,"$sourcefs\@$oldestsnap",0,$sourceisroot);
}
my $disp_pvsize = readablebytes($pvsize);
if ($pvsize == 0) { $disp_pvsize = 'UNKNOWN'; }
my $synccmd = buildsynccmd($sendcmd,$recvcmd,$pvsize,$sourceisroot,$targetisroot);
if (!$quiet) {
if (defined $origin) {
print "INFO: Clone is recreated on target $targetfs based on $origin\n";
}
if (!defined ($args{'no-stream'}) ) {
print "INFO: Sending oldest full snapshot $sourcefs\@$oldestsnap (~ $disp_pvsize) to new target filesystem:\n";
} else {
print "INFO: --no-stream selected; sending newest full snapshot $sourcefs\@$oldestsnap (~ $disp_pvsize) to new target filesystem:\n";
}
}
if ($debug) { print "DEBUG: $synccmd\n"; }
# make sure target is (still) not currently in receive.
if (iszfsbusy($targethost,$targetfs,$targetisroot)) {
warn "Cannot sync now: $targetfs is already target of a zfs receive process.\n";
if ($exitcode < 1) { $exitcode = 1; }
return 0;
}
system($synccmd) == 0 or do {
if (defined $origin) {
print "INFO: clone creation failed, trying ordinary replication as fallback\n";
syncdataset($sourcehost, $sourcefs, $targethost, $targetfs, undef, 1);
return 0;
}
warn "CRITICAL ERROR: $synccmd failed: $?";
if ($exitcode < 3) { $exitcode = 3; }
return 0;
};
# now do an -I to the new sync snapshot, assuming there were any snapshots
# other than the new sync snapshot to begin with, of course - and that we
# aren't invoked with --no-stream, in which case a full of the newest snap
# available was all we needed to do
if (!defined ($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');
$sendcmd = "$sourcesudocmd $zfscmd send $sendoptions $args{'streamarg'} $sourcefsescaped\@$oldestsnapescaped $sourcefsescaped\@$newsyncsnapescaped";
$pvsize = getsendsize($sourcehost,"$sourcefs\@$oldestsnap","$sourcefs\@$newsyncsnap",$sourceisroot);
$disp_pvsize = readablebytes($pvsize);
if ($pvsize == 0) { $disp_pvsize = "UNKNOWN"; }
$synccmd = buildsynccmd($sendcmd,$recvcmd,$pvsize,$sourceisroot,$targetisroot);
# make sure target is (still) not currently in receive.
if (iszfsbusy($targethost,$targetfs,$targetisroot)) {
warn "Cannot sync now: $targetfs is already target of a zfs receive process.\n";
if ($exitcode < 1) { $exitcode = 1; }
return 0;
}
if (!$quiet) { print "INFO: Updating new target filesystem with incremental $sourcefs\@$oldestsnap ... $newsyncsnap (~ $disp_pvsize):\n"; }
if ($debug) { print "DEBUG: $synccmd\n"; }
if ($oldestsnap ne $newsyncsnap) {
my $ret = system($synccmd);
if ($ret != 0) {
warn "CRITICAL ERROR: $synccmd failed: $?";
if ($exitcode < 3) { $exitcode = 3; }
return 0;
}
} else {
if (!$quiet) { print "INFO: no incremental sync needed; $oldestsnap is already the newest available snapshot.\n"; }
}
# restore original readonly value to target after sync complete
# dyking this functionality out for the time being due to buggy mount/unmount behavior
# with ZFS on Linux (possibly OpenZFS in general) when setting/unsetting readonly.
# setzfsvalue($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)) {
$sendoptions = getoptionsline(\@sendoptions, ('P','e','v','w'));
my $sendcmd = "$sourcesudocmd $zfscmd send $sendoptions -t $receivetoken";
my $recvcmd = "$targetsudocmd $zfscmd receive $recvoptions $receiveextraargs $forcedrecv $targetfsescaped 2>&1";
my $pvsize = getsendsize($sourcehost,"","",$sourceisroot,$receivetoken);
my $disp_pvsize = readablebytes($pvsize);
if ($pvsize == 0) { $disp_pvsize = "UNKNOWN"; }
my $synccmd = buildsynccmd($sendcmd,$recvcmd,$pvsize,$sourceisroot,$targetisroot);
if (!$quiet) { print "Resuming interrupted zfs send/receive from $sourcefs to $targetfs (~ $disp_pvsize remaining):\n"; }
if ($debug) { print "DEBUG: $synccmd\n"; }
if ($pvsize == 0) {
# we need to capture the error of zfs send, this will render pv useless but in this case
# it doesn't matter because we don't know the estimated send size (probably because
# the initial snapshot used for resumed send doesn't exist anymore)
($stdout, $exit) = tee_stderr {
system("$synccmd")
};
} else {
($stdout, $exit) = tee_stdout {
system("$synccmd")
};
}
$exit == 0 or do {
if (
$stdout =~ /\Qused in the initial send no longer exists\E/ ||
$stdout =~ /incremental source [0-9xa-f]+ no longer exists/
) {
if (!$quiet) { print "WARN: resetting partially receive state because the snapshot source no longer exists\n"; }
resetreceivestate($targethost,$targetfs,$targetisroot);
# do an normal sync cycle
return syncdataset($sourcehost, $sourcefs, $targethost, $targetfs, $origin);
} else {
warn "CRITICAL ERROR: $synccmd failed: $?";
if ($exitcode < 3) { $exitcode = 3; }
return 0;
}
};
# a resumed transfer will only be done to the next snapshot,
# so do an normal sync cycle
return syncdataset($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'}) {
if (!$quiet) { print "Removing $targetfs because no matching snapshots were found\n"; }
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) {
warn "WARNING: $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 < 3) { $exitcode = 3; }
print "\n";
print "CRITICAL ERROR: Target $targetfs exists but has no snapshots matching with $sourcefs!\n";
print " Replication to target would require destroying existing\n";
print " target. Cowardly refusing to destroy your existing target.\n\n";
# 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) ) {
print " NOTE: Target $targetfs dataset is < 64MB used - did you mistakenly run\n";
print " \`zfs create $args{'target'}\` on the target? ZFS initial\n";
print " replication must be to a NON EXISTENT DATASET, which will\n";
print " then be CREATED BY the initial replication process.\n\n";
}
# return false now in case more child datasets need replication.
return 0;
}
}
# make sure target is (still) not currently in receive.
if (iszfsbusy($targethost,$targetfs,$targetisroot)) {
warn "Cannot sync now: $targetfs is already target of a zfs receive process.\n";
if ($exitcode < 1) { $exitcode = 1; }
return 0;
}
if ($matchingsnap eq $newsyncsnap) {
# barf some text but don't touch the filesystem
if (!$quiet) { print "INFO: no snapshots on source newer than $newsyncsnap on target. Nothing to do, not syncing.\n"; }
return 0;
} else {
my $matchingsnapescaped = escapeshellparam($matchingsnap);
# rollback target to matchingsnap
if (!defined $args{'no-rollback'}) {
my $rollbacktype = "-R";
if (defined $args{'no-clone-rollback'}) {
$rollbacktype = "-r";
}
if ($debug) { print "DEBUG: rolling back target to $targetfs\@$matchingsnap...\n"; }
if ($targethost ne '') {
if ($debug) { print "$sshcmd $targethost $targetsudocmd $zfscmd rollback $rollbacktype $targetfsescaped\@$matchingsnapescaped\n"; }
system ("$sshcmd $targethost " . escapeshellparam("$targetsudocmd $zfscmd rollback $rollbacktype $targetfsescaped\@$matchingsnapescaped"));
} else {
if ($debug) { print "$targetsudocmd $zfscmd rollback $rollbacktype $targetfsescaped\@$matchingsnapescaped\n"; }
system ("$targetsudocmd $zfscmd rollback $rollbacktype $targetfsescaped\@$matchingsnapescaped");
}
}
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;
}
}
}
# bookmark stream size can't be determined
my $pvsize = 0;
my $disp_pvsize = "UNKNOWN";
$sendoptions = getoptionsline(\@sendoptions, ('L','c','e','w'));
if ($nextsnapshot) {
my $nextsnapshotescaped = escapeshellparam($nextsnapshot);
my $sendcmd = "$sourcesudocmd $zfscmd send $sendoptions -i $sourcefsescaped#$bookmarkescaped $sourcefsescaped\@$nextsnapshotescaped";
my $recvcmd = "$targetsudocmd $zfscmd receive $recvoptions $receiveextraargs $forcedrecv $targetfsescaped 2>&1";
my $synccmd = buildsynccmd($sendcmd,$recvcmd,$pvsize,$sourceisroot,$targetisroot);
if (!$quiet) { print "Sending incremental $sourcefs#$bookmarkescaped ... $nextsnapshot (~ $disp_pvsize):\n"; }
if ($debug) { print "DEBUG: $synccmd\n"; }
($stdout, $exit) = tee_stdout {
system("$synccmd")
};
$exit == 0 or do {
if (!$resume && $stdout =~ /\Qcontains partially-complete state\E/) {
if (!$quiet) { print "WARN: resetting partially receive state\n"; }
resetreceivestate($targethost,$targetfs,$targetisroot);
system("$synccmd") == 0 or do {
warn "CRITICAL ERROR: $synccmd failed: $?";
if ($exitcode < 3) { $exitcode = 3; }
return 0;
}
} else {
warn "CRITICAL ERROR: $synccmd failed: $?";
if ($exitcode < 3) { $exitcode = 3; }
return 0;
}
};
$matchingsnap = $nextsnapshot;
$matchingsnapescaped = escapeshellparam($matchingsnap);
} else {
my $sendcmd = "$sourcesudocmd $zfscmd send $sendoptions -i $sourcefsescaped#$bookmarkescaped $sourcefsescaped\@$newsyncsnapescaped";
my $recvcmd = "$targetsudocmd $zfscmd receive $recvoptions $receiveextraargs $forcedrecv $targetfsescaped 2>&1";
my $synccmd = buildsynccmd($sendcmd,$recvcmd,$pvsize,$sourceisroot,$targetisroot);
if (!$quiet) { print "Sending incremental $sourcefs#$bookmarkescaped ... $newsyncsnap (~ $disp_pvsize):\n"; }
if ($debug) { print "DEBUG: $synccmd\n"; }
($stdout, $exit) = tee_stdout {
system("$synccmd")
};
$exit == 0 or do {
if (!$resume && $stdout =~ /\Qcontains partially-complete state\E/) {
if (!$quiet) { print "WARN: resetting partially receive state\n"; }
resetreceivestate($targethost,$targetfs,$targetisroot);
system("$synccmd") == 0 or do {
warn "CRITICAL ERROR: $synccmd failed: $?";
if ($exitcode < 3) { $exitcode = 3; }
return 0;
}
} else {
warn "CRITICAL ERROR: $synccmd failed: $?";
if ($exitcode < 3) { $exitcode = 3; }
return 0;
}
};
}
}
# do a normal replication if bookmarks aren't used or if previous
# bookmark replication was only done to the next oldest snapshot
if (!$bookmark || $nextsnapshot) {
if ($matchingsnap eq $newsyncsnap) {
# edge case: bookmark replication used the latest snapshot
return 0;
}
$sendoptions = getoptionsline(\@sendoptions, ('D','L','P','R','c','e','h','p','v','w'));
my $sendcmd = "$sourcesudocmd $zfscmd send $sendoptions $args{'streamarg'} $sourcefsescaped\@$matchingsnapescaped $sourcefsescaped\@$newsyncsnapescaped";
my $recvcmd = "$targetsudocmd $zfscmd receive $recvoptions $receiveextraargs $forcedrecv $targetfsescaped 2>&1";
my $pvsize = getsendsize($sourcehost,"$sourcefs\@$matchingsnap","$sourcefs\@$newsyncsnap",$sourceisroot);
my $disp_pvsize = readablebytes($pvsize);
if ($pvsize == 0) { $disp_pvsize = "UNKNOWN"; }
my $synccmd = buildsynccmd($sendcmd,$recvcmd,$pvsize,$sourceisroot,$targetisroot);
if (!$quiet) { print "Sending incremental $sourcefs\@$matchingsnap ... $newsyncsnap (~ $disp_pvsize):\n"; }
if ($debug) { print "DEBUG: $synccmd\n"; }
($stdout, $exit) = tee_stdout {
system("$synccmd")
};
$exit == 0 or do {
# FreeBSD reports "dataset is busy" instead of "contains partially-complete state"
if (!$resume && ($stdout =~ /\Qcontains partially-complete state\E/ || $stdout =~ /\Qdataset is busy\E/)) {
if (!$quiet) { print "WARN: resetting partially receive state\n"; }
resetreceivestate($targethost,$targetfs,$targetisroot);
system("$synccmd") == 0 or do {
warn "CRITICAL ERROR: $synccmd failed: $?";
if ($exitcode < 3) { $exitcode = 3; }
return 0;
}
} else {
warn "CRITICAL ERROR: $synccmd failed: $?";
if ($exitcode < 3) { $exitcode = 3; }
return 0;
}
};
}
# restore original readonly value to target after sync complete
# dyking this functionality out for the time being due to buggy mount/unmount behavior
# with ZFS on Linux (possibly OpenZFS in general) when setting/unsetting readonly.
#setzfsvalue($targethost,$targetfs,$targetisroot,'readonly',$originaltargetreadonly);
}
}
if (defined $args{'no-sync-snap'}) {
if (defined $args{'create-bookmark'}) {
my $bookmarkcmd;
if ($sourcehost ne '') {
$bookmarkcmd = "$sshcmd $sourcehost " . escapeshellparam("$sourcesudocmd $zfscmd bookmark $sourcefsescaped\@$newsyncsnapescaped $sourcefsescaped\#$newsyncsnapescaped");
} else {
$bookmarkcmd = "$sourcesudocmd $zfscmd bookmark $sourcefsescaped\@$newsyncsnapescaped $sourcefsescaped\#$newsyncsnapescaped";
}
if ($debug) { print "DEBUG: $bookmarkcmd\n"; }
system($bookmarkcmd) == 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);
if (!$quiet) { print "INFO: bookmark creation failed, retrying with guid based suffix ($guid)...\n"; }
if ($sourcehost ne '') {
$bookmarkcmd = "$sshcmd $sourcehost " . escapeshellparam("$sourcesudocmd $zfscmd bookmark $sourcefsescaped\@$newsyncsnapescaped $sourcefsescaped\#$newsyncsnapescaped$guid");
} else {
$bookmarkcmd = "$sourcesudocmd $zfscmd bookmark $sourcefsescaped\@$newsyncsnapescaped $sourcefsescaped\#$newsyncsnapescaped$guid";
}
if ($debug) { print "DEBUG: $bookmarkcmd\n"; }
system($bookmarkcmd) == 0 or do {
warn "CRITICAL ERROR: $bookmarkcmd failed: $?";
if ($exitcode < 3) { $exitcode = 3; }
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 %{ $snaps{'target'}});
}
}
} # end syncdataset()
sub compressargset {
my ($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'))) {
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 $targetssh;
# if --nocommandchecks then assume everything's available and return
if ($args{'nocommandchecks'}) {
if ($debug) { print "DEBUG: not checking for command availability due to --nocommandchecks switch.\n"; }
$avail{'compress'} = 1;
$avail{'localpv'} = 1;
$avail{'localmbuffer'} = 1;
$avail{'sourcembuffer'} = 1;
$avail{'targetmbuffer'} = 1;
$avail{'sourceresume'} = 1;
$avail{'targetresume'} = 1;
return %avail;
}
if (!defined $sourcehost) { $sourcehost = ''; }
if (!defined $targethost) { $targethost = ''; }
if ($sourcehost ne '') { $sourcessh = "$sshcmd $sourcehost"; } else { $sourcessh = ''; }
if ($targethost ne '') { $targetssh = "$sshcmd $targethost"; } else { $targetssh = ''; }
# if raw compress command is null, we must have specified no compression. otherwise,
# make sure that compression is available everywhere we need it
if ($compressargs{'compress'} eq 'none') {
if ($debug) { print "DEBUG: compression forced off from command line arguments.\n"; }
} else {
if ($debug) { print "DEBUG: checking availability of $compressargs{'rawcmd'} on source...\n"; }
$avail{'sourcecompress'} = `$sourcessh $checkcmd $compressargs{'rawcmd'} 2>/dev/null`;
if ($debug) { print "DEBUG: checking availability of $compressargs{'rawcmd'} on target...\n"; }
$avail{'targetcompress'} = `$targetssh $checkcmd $compressargs{'rawcmd'} 2>/dev/null`;
if ($debug) { print "DEBUG: checking availability of $compressargs{'rawcmd'} on local machine...\n"; }
$avail{'localcompress'} = `$checkcmd $compressargs{'rawcmd'} 2>/dev/null`;
}
my ($s,$t);
if ($sourcehost eq '') {
$s = '[local machine]'
} else {
$s = $sourcehost;
$s =~ s/^\S*\@//;
$s = "ssh:$s";
}
if ($targethost eq '') {
$t = '[local machine]'
} else {
$t = $targethost;
$t =~ s/^\S*\@//;
$t = "ssh:$t";
}
if (!defined $avail{'sourcecompress'}) { $avail{'sourcecompress'} = ''; }