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58a3c91c FG |
1 | package PVE::AbstractConfig; |
2 | ||
3 | use strict; | |
4 | use warnings; | |
5 | ||
6 | use PVE::Tools qw(lock_file lock_file_full); | |
7 | use PVE::INotify; | |
8 | use PVE::Cluster; | |
9 | use PVE::Storage; | |
10 | ||
11 | my $nodename = PVE::INotify::nodename(); | |
12 | ||
13 | # Printable string, currently either "VM" or "CT" | |
14 | sub guest_type { | |
15 | my ($class) = @_; | |
16 | die "abstract method - implement me "; | |
17 | } | |
18 | ||
19 | sub __config_max_unused_disks { | |
20 | my ($class) = @_; | |
21 | ||
22 | die "implement me - abstract method\n"; | |
23 | } | |
24 | ||
25 | # Path to the flock file for this VM/CT | |
26 | sub config_file_lock { | |
27 | my ($class, $vmid) = @_; | |
28 | die "abstract method - implement me"; | |
29 | } | |
30 | ||
31 | # Relative config file path for this VM/CT in CFS | |
32 | sub cfs_config_path { | |
33 | my ($class, $vmid, $node) = @_; | |
34 | die "abstract method - implement me"; | |
35 | } | |
36 | ||
37 | # Absolute config file path for this VM/CT | |
38 | sub config_file { | |
39 | my ($class, $vmid, $node) = @_; | |
40 | ||
41 | my $cfspath = $class->cfs_config_path($vmid, $node); | |
42 | return "/etc/pve/$cfspath"; | |
43 | } | |
44 | ||
45 | # Read and parse config file for this VM/CT | |
46 | sub load_config { | |
47 | my ($class, $vmid, $node) = @_; | |
48 | ||
49 | $node = $nodename if !$node; | |
50 | my $cfspath = $class->cfs_config_path($vmid, $node); | |
51 | ||
52 | my $conf = PVE::Cluster::cfs_read_file($cfspath); | |
53 | die "Configuration file '$cfspath' does not exist\n" | |
54 | if !defined($conf); | |
55 | ||
56 | return $conf; | |
57 | } | |
58 | ||
59 | # Generate and write config file for this VM/CT | |
60 | sub write_config { | |
61 | my ($class, $vmid, $conf) = @_; | |
62 | ||
63 | my $cfspath = $class->cfs_config_path($vmid); | |
64 | ||
65 | PVE::Cluster::cfs_write_file($cfspath, $conf); | |
66 | } | |
67 | ||
68 | # Lock config file using flock, run $code with @param, unlock config file. | |
69 | # $timeout is the maximum time to aquire the flock | |
70 | sub lock_config_full { | |
71 | my ($class, $vmid, $timeout, $code, @param) = @_; | |
72 | ||
73 | my $filename = $class->config_file_lock($vmid); | |
74 | ||
75 | my $res = lock_file($filename, $timeout, $code, @param); | |
76 | ||
77 | die $@ if $@; | |
78 | ||
79 | return $res; | |
80 | } | |
81 | ||
82 | # Lock config file using flock, run $code with @param, unlock config file. | |
83 | # $timeout is the maximum time to aquire the flock | |
84 | # $shared eq 1 creates a non-exclusive ("read") flock | |
85 | sub lock_config_mode { | |
86 | my ($class, $vmid, $timeout, $shared, $code, @param) = @_; | |
87 | ||
88 | my $filename = $class->config_file_lock($vmid); | |
89 | ||
90 | my $res = lock_file_full($filename, $timeout, $shared, $code, @param); | |
91 | ||
92 | die $@ if $@; | |
93 | ||
94 | return $res; | |
95 | } | |
96 | ||
97 | # Lock config file using flock, run $code with @param, unlock config file. | |
98 | sub lock_config { | |
99 | my ($class, $vmid, $code, @param) = @_; | |
100 | ||
101 | return $class->lock_config_full($vmid, 10, $code, @param); | |
102 | } | |
103 | ||
104 | # Checks whether the config is locked with the lock parameter | |
105 | sub check_lock { | |
106 | my ($class, $conf) = @_; | |
107 | ||
108 | die $class->guest_type()." is locked ($conf->{lock})\n" if $conf->{lock}; | |
109 | } | |
110 | ||
111 | # Returns whether the config is locked with the lock parameter, also checks | |
112 | # whether the lock value is correct if the optional $lock is set. | |
113 | sub has_lock { | |
114 | my ($class, $conf, $lock) = @_; | |
115 | ||
116 | return $conf->{lock} && (!defined($lock) || $lock eq $conf->{lock}); | |
117 | } | |
118 | ||
119 | # Sets the lock parameter for this VM/CT's config to $lock. | |
120 | sub set_lock { | |
121 | my ($class, $vmid, $lock) = @_; | |
122 | ||
123 | my $conf; | |
124 | $class->lock_config($vmid, sub { | |
125 | $conf = $class->load_config($vmid); | |
126 | $class->check_lock($conf); | |
127 | $conf->{lock} = $lock; | |
128 | $class->write_config($vmid, $conf); | |
129 | }); | |
130 | return $conf; | |
131 | } | |
132 | ||
133 | # Removes the lock parameter for this VM/CT's config, also checks whether | |
134 | # the lock value is correct if the optional $lock is set. | |
135 | sub remove_lock { | |
136 | my ($class, $vmid, $lock) = @_; | |
137 | ||
138 | $class->lock_config($vmid, sub { | |
139 | my $conf = $class->load_config($vmid); | |
140 | if (!$conf->{lock}) { | |
141 | my $lockstring = defined($lock) ? "'$lock' " : "any"; | |
142 | die "no lock found trying to remove $lockstring lock\n"; | |
143 | } elsif (defined($lock) && $conf->{lock} ne $lock) { | |
144 | die "found lock '$conf->{lock}' trying to remove '$lock' lock\n"; | |
145 | } | |
146 | delete $conf->{lock}; | |
147 | $class->write_config($vmid, $conf); | |
148 | }); | |
149 | } | |
150 | ||
151 | # Checks whether protection mode is enabled for this VM/CT. | |
152 | sub check_protection { | |
153 | my ($class, $conf, $err_msg) = @_; | |
154 | ||
155 | if ($conf->{protection}) { | |
156 | die "$err_msg - protection mode enabled\n"; | |
157 | } | |
158 | } | |
159 | ||
160 | # Adds an unused volume to $config, if possible. | |
161 | sub add_unused_volume { | |
162 | my ($class, $config, $volid) = @_; | |
163 | ||
164 | my $key; | |
165 | for (my $ind = $class->__config_max_unused_disks() - 1; $ind >= 0; $ind--) { | |
166 | my $test = "unused$ind"; | |
167 | if (my $vid = $config->{$test}) { | |
168 | return if $vid eq $volid; # do not add duplicates | |
169 | } else { | |
170 | $key = $test; | |
171 | } | |
172 | } | |
173 | ||
174 | die "Too many unused volumes - please delete them first.\n" if !$key; | |
175 | ||
176 | $config->{$key} = $volid; | |
177 | ||
178 | return $key; | |
179 | } | |
180 | ||
181 | # Returns whether the template parameter is set in $conf. | |
182 | sub is_template { | |
183 | my ($class, $conf) = @_; | |
184 | ||
185 | return 1 if defined $conf->{template} && $conf->{template} == 1; | |
186 | } | |
187 | ||
188 | # Checks whether $feature is availabe for the referenced volumes in $conf. | |
189 | # Note: depending on the parameters, some volumes may be skipped! | |
190 | sub has_feature { | |
191 | my ($class, $feature, $conf, $storecfg, $snapname, $running, $backup_only) = @_; | |
192 | die "implement me - abstract method\n"; | |
193 | } | |
194 | ||
195 | # Internal snapshots | |
196 | ||
197 | # NOTE: Snapshot create/delete involves several non-atomic | |
198 | # actions, and can take a long time. | |
199 | # So we try to avoid locking the file and use the 'lock' variable | |
200 | # inside the config file instead. | |
201 | ||
202 | # Save the vmstate (RAM). | |
203 | sub __snapshot_save_vmstate { | |
204 | my ($class, $vmid, $conf, $snapname, $storecfg) = @_; | |
205 | die "implement me - abstract method\n"; | |
206 | } | |
207 | ||
208 | # Check whether the VM/CT is running. | |
209 | sub __snapshot_check_running { | |
210 | my ($class, $vmid) = @_; | |
211 | die "implement me - abstract method\n"; | |
212 | } | |
213 | ||
214 | # Check whether we need to freeze the VM/CT | |
215 | sub __snapshot_check_freeze_needed { | |
216 | my ($sself, $vmid, $config, $save_vmstate) = @_; | |
217 | die "implement me - abstract method\n"; | |
218 | } | |
219 | ||
220 | # Freeze or unfreeze the VM/CT. | |
221 | sub __snapshot_freeze { | |
222 | my ($class, $vmid, $unfreeze) = @_; | |
223 | ||
224 | die "abstract method - implement me\n"; | |
225 | } | |
226 | ||
227 | # Code run before and after creating all the volume snapshots | |
228 | # base: noop | |
229 | sub __snapshot_create_vol_snapshots_hook { | |
230 | my ($class, $vmid, $snap, $running, $hook) = @_; | |
231 | ||
232 | return; | |
233 | } | |
234 | ||
235 | # Create the volume snapshots for the VM/CT. | |
236 | sub __snapshot_create_vol_snapshot { | |
237 | my ($class, $vmid, $vs, $volume, $snapname) = @_; | |
238 | ||
239 | die "abstract method - implement me\n"; | |
240 | } | |
241 | ||
242 | # Remove a drive from the snapshot config. | |
243 | sub __snapshot_delete_remove_drive { | |
244 | my ($class, $snap, $drive) = @_; | |
245 | ||
246 | die "abstract method - implement me\n"; | |
247 | } | |
248 | ||
249 | # Delete the vmstate file/drive | |
250 | sub __snapshot_delete_vmstate_file { | |
251 | my ($class, $snap, $force) = @_; | |
252 | ||
253 | die "abstract method - implement me\n"; | |
254 | } | |
255 | ||
256 | # Delete a volume snapshot | |
257 | sub __snapshot_delete_vol_snapshot { | |
258 | my ($class, $vmid, $vs, $volume, $snapname) = @_; | |
259 | ||
260 | die "abstract method - implement me\n"; | |
261 | } | |
262 | ||
263 | # Checks whether a volume snapshot is possible for this volume. | |
264 | sub __snapshot_rollback_vol_possible { | |
265 | my ($class, $volume, $snapname) = @_; | |
266 | ||
267 | die "abstract method - implement me\n"; | |
268 | } | |
269 | ||
270 | # Rolls back this volume. | |
271 | sub __snapshot_rollback_vol_rollback { | |
272 | my ($class, $volume, $snapname) = @_; | |
273 | ||
274 | die "abstract method - implement me\n"; | |
275 | } | |
276 | ||
277 | # Stops the VM/CT for a rollback. | |
278 | sub __snapshot_rollback_vm_stop { | |
279 | my ($class, $vmid) = @_; | |
280 | ||
281 | die "abstract method - implement me\n"; | |
282 | } | |
283 | ||
284 | # Start the VM/CT after a rollback with restored vmstate. | |
285 | sub __snapshot_rollback_vm_start { | |
286 | my ($class, $vmid, $vmstate, $forcemachine); | |
287 | ||
288 | die "abstract method - implement me\n"; | |
289 | } | |
290 | ||
291 | # Get list of volume IDs which are referenced in $conf, but not in $snap. | |
292 | sub __snapshot_rollback_get_unused { | |
293 | my ($class, $conf, $snap) = @_; | |
294 | ||
295 | die "abstract method - implement me\n"; | |
296 | } | |
297 | ||
298 | # Iterate over all configured volumes, calling $func for each key/value pair. | |
299 | sub __snapshot_foreach_volume { | |
300 | my ($class, $conf, $func) = @_; | |
301 | ||
302 | die "abstract method - implement me\n"; | |
303 | } | |
304 | ||
305 | # Copy the current config $source to the snapshot config $dest | |
306 | sub __snapshot_copy_config { | |
307 | my ($class, $source, $dest) = @_; | |
308 | ||
309 | foreach my $k (keys %$source) { | |
310 | next if $k eq 'snapshots'; | |
311 | next if $k eq 'snapstate'; | |
312 | next if $k eq 'snaptime'; | |
313 | next if $k eq 'vmstate'; | |
314 | next if $k eq 'lock'; | |
315 | next if $k eq 'digest'; | |
316 | next if $k eq 'description'; | |
317 | next if $k =~ m/^unused\d+$/; | |
318 | ||
319 | $dest->{$k} = $source->{$k}; | |
320 | } | |
321 | }; | |
322 | ||
323 | # Apply the snapshot config $snap to the config $conf (rollback) | |
324 | sub __snapshot_apply_config { | |
325 | my ($class, $conf, $snap) = @_; | |
326 | ||
327 | # copy snapshot list | |
328 | my $newconf = { | |
329 | snapshots => $conf->{snapshots}, | |
330 | }; | |
331 | ||
332 | # keep description and list of unused disks | |
333 | foreach my $k (keys %$conf) { | |
334 | next if !($k =~ m/^unused\d+$/ || $k eq 'description'); | |
335 | $newconf->{$k} = $conf->{$k}; | |
336 | } | |
337 | ||
338 | $class->__snapshot_copy_config($snap, $newconf); | |
339 | ||
340 | return $newconf; | |
341 | } | |
342 | ||
343 | # Prepares the configuration for snapshotting. | |
344 | sub __snapshot_prepare { | |
345 | my ($class, $vmid, $snapname, $save_vmstate, $comment) = @_; | |
346 | ||
347 | my $snap; | |
348 | ||
349 | my $updatefn = sub { | |
350 | ||
351 | my $conf = $class->load_config($vmid); | |
352 | ||
353 | die "you can't take a snapshot if it's a template\n" | |
354 | if $class->is_template($conf); | |
355 | ||
356 | $class->check_lock($conf); | |
357 | ||
358 | $conf->{lock} = 'snapshot'; | |
359 | ||
360 | die "snapshot name '$snapname' already used\n" | |
361 | if defined($conf->{snapshots}->{$snapname}); | |
362 | ||
363 | my $storecfg = PVE::Storage::config(); | |
364 | die "snapshot feature is not available\n" | |
365 | if !$class->has_feature('snapshot', $conf, $storecfg, undef, undef, $snapname eq 'vzdump'); | |
366 | ||
367 | $snap = $conf->{snapshots}->{$snapname} = {}; | |
368 | ||
369 | if ($save_vmstate && $class->__snapshot_check_running($vmid)) { | |
370 | $class->__snapshot_save_vmstate($vmid, $conf, $snapname, $storecfg); | |
371 | } | |
372 | ||
373 | $class->__snapshot_copy_config($conf, $snap); | |
374 | ||
375 | $snap->{snapstate} = "prepare"; | |
376 | $snap->{snaptime} = time(); | |
377 | $snap->{description} = $comment if $comment; | |
378 | ||
379 | $class->write_config($vmid, $conf); | |
380 | }; | |
381 | ||
382 | $class->lock_config($vmid, $updatefn); | |
383 | ||
384 | return $snap; | |
385 | } | |
386 | ||
387 | # Commits the configuration after snapshotting. | |
388 | sub __snapshot_commit { | |
389 | my ($class, $vmid, $snapname) = @_; | |
390 | ||
391 | my $updatefn = sub { | |
392 | ||
393 | my $conf = $class->load_config($vmid); | |
394 | ||
395 | die "missing snapshot lock\n" | |
396 | if !($conf->{lock} && $conf->{lock} eq 'snapshot'); | |
397 | ||
398 | my $snap = $conf->{snapshots}->{$snapname}; | |
399 | die "snapshot '$snapname' does not exist\n" if !defined($snap); | |
400 | ||
401 | die "wrong snapshot state\n" | |
402 | if !($snap->{snapstate} && $snap->{snapstate} eq "prepare"); | |
403 | ||
404 | delete $snap->{snapstate}; | |
405 | delete $conf->{lock}; | |
406 | ||
407 | $conf->{parent} = $snapname; | |
408 | ||
409 | $class->write_config($vmid, $conf); | |
410 | }; | |
411 | ||
412 | $class->lock_config($vmid, $updatefn); | |
413 | } | |
414 | ||
415 | # Creates a snapshot for the VM/CT. | |
416 | sub snapshot_create { | |
417 | my ($class, $vmid, $snapname, $save_vmstate, $comment) = @_; | |
418 | ||
419 | my $snap = $class->__snapshot_prepare($vmid, $snapname, $save_vmstate, $comment); | |
420 | ||
421 | $save_vmstate = 0 if !$snap->{vmstate}; | |
422 | ||
423 | my $conf = $class->load_config($vmid); | |
424 | ||
425 | my ($running, $freezefs) = $class->__snapshot_check_freeze_needed($vmid, $conf, $snap->{vmstate}); | |
426 | ||
427 | my $drivehash = {}; | |
428 | ||
429 | eval { | |
430 | if ($freezefs) { | |
431 | $class->__snapshot_freeze($vmid, 0); | |
432 | } | |
433 | ||
434 | $class->__snapshot_create_vol_snapshots_hook($vmid, $snap, $running, "before"); | |
435 | ||
436 | $class->__snapshot_foreach_volume($snap, sub { | |
437 | my ($vs, $volume) = @_; | |
438 | ||
439 | $class->__snapshot_create_vol_snapshot($vmid, $vs, $volume, $snapname); | |
440 | $drivehash->{$vs} = 1; | |
441 | }); | |
442 | }; | |
443 | my $err = $@; | |
444 | ||
445 | if ($running) { | |
446 | $class->__snapshot_create_vol_snapshots_hook($vmid, $snap, $running, "after"); | |
447 | if ($freezefs) { | |
448 | $class->__snapshot_freeze($vmid, 1); | |
449 | } | |
450 | $class->__snapshot_create_vol_snapshots_hook($vmid, $snap, $running, "after-unfreeze"); | |
451 | } | |
452 | ||
453 | if ($err) { | |
454 | warn "snapshot create failed: starting cleanup\n"; | |
455 | eval { $class->snapshot_delete($vmid, $snapname, 1, $drivehash); }; | |
456 | warn "$@" if $@; | |
457 | die "$err\n"; | |
458 | } | |
459 | ||
460 | $class->__snapshot_commit($vmid, $snapname); | |
461 | } | |
462 | ||
463 | # Deletes a snapshot. | |
464 | # Note: $drivehash is only set when called from snapshot_create. | |
465 | sub snapshot_delete { | |
466 | my ($class, $vmid, $snapname, $force, $drivehash) = @_; | |
467 | ||
468 | my $prepare = 1; | |
469 | ||
470 | my $snap; | |
471 | my $unused = []; | |
472 | ||
473 | $class->set_lock($vmid, 'snapshot-delete') | |
474 | if (!$drivehash); # doesn't already have a 'snapshot' lock | |
475 | ||
476 | my $unlink_parent = sub { | |
477 | my ($confref, $new_parent) = @_; | |
478 | ||
479 | if ($confref->{parent} && $confref->{parent} eq $snapname) { | |
480 | if ($new_parent) { | |
481 | $confref->{parent} = $new_parent; | |
482 | } else { | |
483 | delete $confref->{parent}; | |
484 | } | |
485 | } | |
486 | }; | |
487 | ||
488 | my $remove_drive = sub { | |
489 | my ($drive) = @_; | |
490 | ||
491 | my $conf = $class->load_config($vmid); | |
492 | $snap = $conf->{snapshots}->{$snapname}; | |
493 | die "snapshot '$snapname' does not exist\n" if !defined($snap); | |
494 | ||
495 | $class->__snapshot_delete_remove_drive($snap, $drive); | |
496 | ||
497 | $class->write_config($vmid, $conf); | |
498 | }; | |
499 | ||
500 | #prepare | |
501 | $class->lock_config($vmid, sub { | |
502 | my $conf = $class->load_config($vmid); | |
503 | ||
504 | die "you can't delete a snapshot if vm is a template\n" | |
505 | if $class->is_template($conf); | |
506 | ||
507 | $snap = $conf->{snapshots}->{$snapname}; | |
508 | die "snapshot '$snapname' does not exist\n" if !defined($snap); | |
509 | ||
510 | $snap->{snapstate} = 'delete'; | |
511 | ||
512 | $class->write_config($vmid, $conf); | |
513 | }); | |
514 | ||
515 | # now remove vmstate file | |
516 | if ($snap->{vmstate}) { | |
517 | $class->__snapshot_delete_vmstate_file($snap, $force); | |
518 | ||
519 | # save changes (remove vmstate from snapshot) | |
520 | $class->lock_config($vmid, $remove_drive, 'vmstate') if !$force; | |
521 | }; | |
522 | ||
523 | # now remove all volume snapshots | |
524 | $class->__snapshot_foreach_volume($snap, sub { | |
525 | my ($vs, $volume) = @_; | |
526 | ||
527 | return if $snapname eq 'vzdump' && $vs ne 'rootfs' && !$volume->{backup}; | |
528 | if (!$drivehash || $drivehash->{$vs}) { | |
529 | eval { $class->__snapshot_delete_vol_snapshot($vmid, $vs, $volume, $snapname, $unused); }; | |
530 | if (my $err = $@) { | |
531 | die $err if !$force; | |
532 | warn $err; | |
533 | } | |
534 | } | |
535 | ||
536 | # save changes (remove drive from snapshot) | |
537 | $class->lock_config($vmid, $remove_drive, $vs) if !$force; | |
538 | }); | |
539 | ||
540 | # now cleanup config | |
541 | $class->lock_config($vmid, sub { | |
542 | my $conf = $class->load_config($vmid); | |
543 | $snap = $conf->{snapshots}->{$snapname}; | |
544 | die "snapshot '$snapname' does not exist\n" if !defined($snap); | |
545 | ||
546 | # remove parent refs | |
547 | &$unlink_parent($conf, $snap->{parent}); | |
548 | foreach my $sn (keys %{$conf->{snapshots}}) { | |
549 | next if $sn eq $snapname; | |
550 | &$unlink_parent($conf->{snapshots}->{$sn}, $snap->{parent}); | |
551 | } | |
552 | ||
553 | ||
554 | delete $conf->{snapshots}->{$snapname}; | |
555 | delete $conf->{lock}; | |
556 | foreach my $volid (@$unused) { | |
557 | $class->add_unused_volume($conf, $volid); | |
558 | } | |
559 | ||
560 | $class->write_config($vmid, $conf); | |
561 | }); | |
562 | } | |
563 | ||
564 | # Rolls back to a given snapshot. | |
565 | sub snapshot_rollback { | |
566 | my ($class, $vmid, $snapname) = @_; | |
567 | ||
568 | my $prepare = 1; | |
569 | ||
570 | my $storecfg = PVE::Storage::config(); | |
571 | ||
572 | my $conf = $class->load_config($vmid); | |
573 | ||
574 | my $get_snapshot_config = sub { | |
575 | ||
576 | die "you can't rollback if vm is a template\n" if $class->is_template($conf); | |
577 | ||
578 | my $res = $conf->{snapshots}->{$snapname}; | |
579 | ||
580 | die "snapshot '$snapname' does not exist\n" if !defined($res); | |
581 | ||
582 | return $res; | |
583 | }; | |
584 | ||
585 | my $snap = &$get_snapshot_config(); | |
586 | ||
587 | $class->__snapshot_foreach_volume($snap, sub { | |
588 | my ($vs, $volume) = @_; | |
589 | ||
590 | $class->__snapshot_rollback_vol_possible($volume, $snapname); | |
591 | }); | |
592 | ||
593 | my $updatefn = sub { | |
594 | ||
595 | $conf = $class->load_config($vmid); | |
596 | ||
597 | $snap = &$get_snapshot_config(); | |
598 | ||
599 | die "unable to rollback to incomplete snapshot (snapstate = $snap->{snapstate})\n" | |
600 | if $snap->{snapstate}; | |
601 | ||
602 | if ($prepare) { | |
603 | $class->check_lock($conf); | |
604 | $class->__snapshot_rollback_vm_stop($vmid); | |
605 | } | |
606 | ||
607 | die "unable to rollback vm $vmid: vm is running\n" | |
608 | if $class->__snapshot_check_running($vmid); | |
609 | ||
610 | if ($prepare) { | |
611 | $conf->{lock} = 'rollback'; | |
612 | } else { | |
613 | die "got wrong lock\n" if !($conf->{lock} && $conf->{lock} eq 'rollback'); | |
614 | delete $conf->{lock}; | |
615 | } | |
616 | ||
617 | # machine only relevant for Qemu | |
618 | my $forcemachine; | |
619 | ||
620 | if (!$prepare) { | |
621 | my $unused = $class->__snapshot_rollback_get_unused($conf, $snap); | |
622 | ||
623 | foreach my $volid (@$unused) { | |
624 | $class->add_unused_volume($conf, $volid); | |
625 | } | |
626 | ||
627 | my $has_machine_config = defined($conf->{machine}); | |
628 | ||
629 | # copy snapshot config to current config | |
630 | $conf = $class->__snapshot_apply_config($conf, $snap); | |
631 | $conf->{parent} = $snapname; | |
632 | ||
633 | # Note: old code did not store 'machine', so we try to be smart | |
634 | # and guess the snapshot was generated with kvm 1.4 (pc-i440fx-1.4). | |
635 | $forcemachine = $conf->{machine} || 'pc-i440fx-1.4'; | |
636 | # we remove the 'machine' configuration if not explicitly specified | |
637 | # in the original config. | |
638 | delete $conf->{machine} if $snap->{vmstate} && !$has_machine_config; | |
639 | } | |
640 | ||
641 | $class->write_config($vmid, $conf); | |
642 | ||
643 | if (!$prepare && $snap->{vmstate}) { | |
644 | $class->__snapshot_rollback_vm_start($vmid, $snap->{vmstate}, $forcemachine); | |
645 | } | |
646 | }; | |
647 | ||
648 | $class->lock_config($vmid, $updatefn); | |
649 | ||
650 | $class->__snapshot_foreach_volume($snap, sub { | |
651 | my ($vs, $volume) = @_; | |
652 | ||
653 | $class->__snapshot_rollback_vol_rollback($volume, $snapname); | |
654 | }); | |
655 | ||
656 | $prepare = 0; | |
657 | $class->lock_config($vmid, $updatefn); | |
658 | } | |
659 | ||
660 | 1; |