mirror of
https://git.proxmox.com/git/qemu-server
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421 lines
10 KiB
Perl
Executable File
421 lines
10 KiB
Perl
Executable File
#!/usr/bin/perl -w
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#
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# Copyright (C) 2007-2009 Proxmox Server Solutions GmbH
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#
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# Copyright: vzdump is under GNU GPL, the GNU General Public License.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; version 2 dated June, 1991.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the
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# Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
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# MA 02110-1301, USA.
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#
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# Author: Dietmar Maurer <dietmar@proxmox.com>
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#
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use strict;
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use Getopt::Long;
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use Sys::Syslog;
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use File::Path;
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use PVE::VZDump;
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use PVE::Storage;
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$ENV{LANG} = "C"; # avoid locale related issues/warnings
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openlog ('vzdump', 'cons,pid', 'daemon');
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my @std_opts = ('extract', 'storage=s', 'info', 'prealloc', 'unique');
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sub print_usage {
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my $msg = shift;
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print STDERR "ERROR: $msg\n\n" if $msg;
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print STDERR "usage: $0 [OPTIONS] <ARCHIVE> <VMID>\n\n";
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}
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sub shellquote {
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my $str = shift;
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return "''" if !defined ($str) || ($str eq '');
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die "unable to quote string containing null (\\000) bytes"
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if $str =~ m/\x00/;
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# from String::ShellQuote
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if ($str =~ m|[^\w!%+,\-./:@^]|) {
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# ' -> '\''
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$str =~ s/'/'\\''/g;
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$str = "'$str'";
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$str =~ s/^''//;
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$str =~ s/''$//;
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}
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return $str;
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}
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my $quoted_cmd = shellquote ($0);
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foreach my $arg (@ARGV) {
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$quoted_cmd .= " " . shellquote ($arg);
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}
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my $opts = {};
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if (!GetOptions ($opts, @std_opts)) {
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print_usage ();
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exit (-1);
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}
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if ($#ARGV != 1) {
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print_usage ();
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exit (-1);
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}
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my $archive = shift;
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my $vmid = PVE::VZDump::check_vmids ((shift))->[0];
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$SIG{INT} = $SIG{TERM} = $SIG{QUIT} = $SIG{HUP} = $SIG{PIPE} = sub {
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die "interrupted by signal\n";
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};
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sub debugmsg { PVE::VZDump::debugmsg (@_); } # just a shortcut
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sub run_command { PVE::VZDump::run_command (undef, @_); } # just a shortcut
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if ($opts->{extract}) {
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# NOTE: this is run as tar subprocess (--to-command)
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my $filename = $ENV{TAR_FILENAME};
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die "got strange environment - no TAR_FILENAME\n" if !$filename;
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my $filesize = $ENV{TAR_SIZE};
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die "got strange file size '$filesize'\n" if !$filesize;
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my $tmpdir = $ENV{VZDUMP_TMPDIR};
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die "got strange environment - no VZDUMP_TMPDIR\n" if !$tmpdir;
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my $filetype = $ENV{TAR_FILETYPE} || 'none';
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die "got strange filetype '$filetype'\n" if $filetype ne 'f';
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my $conffile = "$tmpdir/qemu-server.conf";
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my $statfile = "$tmpdir/qmrestore.stat";
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if ($opts->{info}) {
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print STDERR "reading archive member '$filename'\n";
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} else {
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print STDERR "extracting '$filename' from archive\n";
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}
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if ($filename eq 'qemu-server.conf') {
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my $outfd = IO::File->new ($conffile, "w") ||
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die "unable to write file '$conffile'\n";
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while (defined (my $line = <>)) {
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print $outfd $line;
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print STDERR "CONFIG: $line" if $opts->{info};
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}
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$outfd->close();
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exit (0);
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}
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if ($opts->{info}) {
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exec 'dd', 'bs=256K', "of=/dev/null";
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die "couldn't exec dd: $!\n";
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}
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my $conffd = IO::File->new ($conffile, "r") ||
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die "unable to read file '$conffile'\n";
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my $map;
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while (defined (my $line = <$conffd>)) {
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if ($line =~ m/^\#vzdump\#map:(\S+):(\S+):(\d+):(\S*):$/) {
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$map->{$2} = { virtdev => $1, size => $3, storeid => $4 };
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}
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}
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close ($conffd);
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my $statfd = IO::File->new ($statfile, "a") ||
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die "unable to open file '$statfile'\n";
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if ($filename !~ m/^.*\.([^\.]+)$/){
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die "got strange filename '$filename'\n";
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}
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my $format = $1;
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my $path;
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if (!$map) {
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print STDERR "restoring old style vzdump archive - " .
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"no device map inside archive\n";
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die "can't restore old style archive to storage '$opts->{storage}'\n"
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if $opts->{storage} && $opts->{storage} ne 'local';
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my $dir = "/var/lib/vz/images/$vmid";
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mkpath $dir;
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$path = "$dir/$filename";
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print $statfd "vzdump::$path\n";
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$statfd->close();
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} else {
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my $info = $map->{$filename};
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die "no vzdump info for '$filename'\n" if !$info;
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if ($filename !~ m/^vm-disk-$info->{virtdev}\.([^\.]+)$/){
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die "got strange filename '$filename'\n";
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}
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if ($filesize != $info->{size}) {
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die "detected size difference for '$filename' " .
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"($filesize != $info->{size})\n";
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}
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my $storeid;
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if ($opts->{storage}) {
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$storeid = $opts->{storage};
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} else {
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$storeid = $info->{storeid} || 'local';
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}
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my $cfg = PVE::Storage::load_config();
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my $scfg = PVE::Storage::storage_config ($cfg, $storeid);
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my $alloc_size = ($filesize + 1024 - 1)/1024;
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if ($scfg->{type} eq 'dir' || $scfg->{type} eq 'nfs') {
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# hack: we just alloc a small file (32K) - we overwrite it anyways
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$alloc_size = 32;
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} else {
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die "unable to restore '$filename' to storage '$storeid'\n" .
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"storage type '$scfg->{type}' does not support format '$format\n"
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if $format ne 'raw';
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}
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my $volid = PVE::Storage::vdisk_alloc ($cfg, $storeid, $vmid,
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$format, undef, $alloc_size);
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print STDERR "new volume ID is '$volid'\n";
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print $statfd "vzdump:$info->{virtdev}:$volid\n";
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$statfd->close();
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$path = PVE::Storage::path ($cfg, $volid);
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}
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print STDERR "restore data to '$path' ($filesize bytes)\n";
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if ($opts->{prealloc} || $format ne 'raw' || (-b $path)) {
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exec 'dd', 'ibs=256K', 'obs=256K', "of=$path";
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die "couldn't exec dd: $!\n";
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} else {
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exec '/usr/lib/qemu-server/sparsecp', $path;
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die "couldn't exec sparsecp: $!\n";
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}
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}
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sub restore_cleanup {
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my $statfile = shift;
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return if $opts->{info};
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debugmsg ('info', "starting cleanup");
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if (my $fd = IO::File->new ($statfile, "r")) {
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while (defined (my $line = <$fd>)) {
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if ($line =~ m/vzdump:([^\s:]*):(\S+)$/) {
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my $volid = $2;
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eval {
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if ($volid =~ m|^/|) {
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unlink $volid || die 'unlink failed\n';
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} else {
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my $cfg = PVE::Storage::load_config();
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PVE::Storage::vdisk_free ($cfg, $volid);
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}
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debugmsg ('info', "temporary volume '$volid' sucessfuly removed");
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};
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debugmsg ('err', "unable to cleanup '$volid' - $@") if $@;
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} else {
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debugmsg ('info', "unable to parse line in statfile - $line");
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}
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}
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$fd->close();
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}
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}
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sub restore_qemu {
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my ($archive, $vmid, $tmpdir) = @_;
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local $ENV{VZDUMP_TMPDIR} = $tmpdir;
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my $subcmd = shellquote ("--to-command=${quoted_cmd}\ --extract");
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my $cmd = "tar xf '$archive' $subcmd";
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run_command ($cmd);
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return if $opts->{info};
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# reed new mapping
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my $map = {};
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my $statfile = "$tmpdir/qmrestore.stat";
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if (my $fd = IO::File->new ($statfile, "r")) {
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while (defined (my $line = <$fd>)) {
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if ($line =~ m/vzdump:([^\s:]*):(\S+)$/) {
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$map->{$1} = $2 if $1;
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} else {
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debugmsg ('info', "unable to parse line in statfile - $line");
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}
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}
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$fd->close();
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}
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my $confsrc = "$tmpdir/qemu-server.conf";
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my $srcfd = new IO::File ($confsrc, "r") ||
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die "unable to open file '$confsrc'\n";
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my $conffile = PVE::QemuServer::config_file ($vmid);
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my $tmpfn = "$conffile.$$.tmp";
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my $outfd = new IO::File ($tmpfn, "w") ||
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die "unable to write config for VM $vmid\n";
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eval {
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while (defined (my $line = <$srcfd>)) {
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next if $line =~ m/^\#vzdump\#/;
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next if $line =~ m/^lock:/;
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if (($line =~ m/^((vlan)\d+):(.*)$/) && ($opts->{unique})) {
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my ($id,$ethcfg) = ($1,$3);
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$ethcfg =~ s/^\s+//;
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my ($model, $mac) = split(/\=/,$ethcfg);
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my $printvlan = PVE::QemuServer::print_vlan (PVE::QemuServer::parse_vlan ($model));
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print $outfd "$id: $printvlan\n";
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} elsif ($line =~ m/^((ide|scsi|virtio)\d+):(.*)$/) {
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my $virtdev = $1;
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my $value = $2;
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if ($line =~ m/backup=no/) {
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print $outfd "#$line";
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} elsif ($virtdev && $map->{$virtdev}) {
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my $di = PVE::QemuServer::parse_drive ($virtdev, $value);
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$di->{file} = $map->{$virtdev};
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$value = PVE::QemuServer::print_drive ($vmid, $di);
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print $outfd "$virtdev: $value\n";
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} else {
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print $outfd $line;
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}
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} else {
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print $outfd $line;
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}
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}
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};
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my $err = $@;
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$outfd->close();
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if ($err) {
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unlink $tmpfn;
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die $err;
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} else {
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rename $tmpfn, $conffile;
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}
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}
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my $firstfile = PVE::VZDump::read_firstfile ($archive);
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if ($firstfile ne 'qemu-server.conf') {
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die "ERROR: file '$archive' dos not lock like a QemuServer vzdump backup\n";
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}
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my $tmpdir = "/var/tmp/vzdumptmp$$";
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PVE::QemuServer::lock_config ($vmid, sub {
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my $conffile = PVE::QemuServer::config_file ($vmid);
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die "unable to restore VM '$vmid' - VM already exists\n"
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if -f $conffile;
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mkpath $tmpdir;
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eval {
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debugmsg ('info', "restore QemuServer backup '$archive' " .
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"using ID $vmid", undef, 1) if !$opts->{info};
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restore_qemu ($archive, $vmid, $tmpdir);
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if ($opts->{info}) {
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debugmsg ('info', "reading '$archive' successful");
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} else {
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debugmsg ('info', "restore QemuServer backup '$archive' successful",
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undef, 1);
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}
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};
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my $err = $@;
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if ($err) {
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local $SIG{INT} = $SIG{TERM} = $SIG{QUIT} = $SIG{HUP} = sub {
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debugmsg ('info', "got interrupt - ignored (cleanup phase)");
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};
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restore_cleanup ("$tmpdir/qmrestore.stat") if $err;
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}
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die $err if $err;
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});
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my $err = $@;
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rmtree $tmpdir;
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if ($err) {
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if ($opts->{info}) {
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debugmsg ('info', "reading '$archive' failed - $err");
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} else {
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debugmsg ('err', "restore QemuServer backup '$archive' failed - $err",
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undef, 1);
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}
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exit (-1);
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}
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exit (0);
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__END__
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=head1 NAME
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qmrestore - restore QemuServer vzdump backups
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=head1 SYNOPSIS
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qmrestore [OPTIONS] <archive> <VMID>
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--info read/verify archive and print relevant
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information (test run)
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--unique assign a unique random ethernet address
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--storage <STORAGE_ID> restore to storage <STORAGE_ID>
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--prealloc never generate sparse files
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=head1 DESCRIPTION
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Restore the QemuServer vzdump backup <archive> to virtual machine
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<VMID>. Volumes are allocated on the original storage if there is no
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C<--storage> specified.
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=head1 SEE ALSO
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vzdump(1) vzrestore(1)
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