Fix for previews not being generated sometimes #41067

akhil1508 · 2023-10-23T15:15:09Z

Resolves: [Bug]: Preview for some photos not generated #36463

Summary

A lot of unnecessary rmdir calls are done on the preview directory
After investigating, here are the findings to justify the fix:
- As per
  
  server/lib/private/Files/FileInfo.php
  
  Line 164 in 834c9a2
  
  public function getId() {
  
  there is a return type of int or null
- A null return by this method call over here makes sure that an empty string is passed to $this->appData->getFolder()
- As per the logic, for an empty string this will return the preview folder i.e. appdata_*****/preview in our case
- There is then an attempt to delete this entire folder
On our instance we did find logs that a delete is attempted on the entire preview folder as per [Bug]: Preview for some photos not generated #36463 (comment)
Further, by logging I could confirm that $node->getId() is indeed null in one case leading to consistent triggering of this rmdir
One case is the upload of a partial file (.part extension)
- The Nextcloud clients avoid this but certain DAV clients allow to upload to nextcloud servers
- This kind of file is ignored by isPartialFile
- In this example a file with the .part extension succesfully triggers an rmdir of the entire preview directory

Stack trace of the bug

{
	"reqId": "*****",
	"level": 3,
	"time": "2023-10-17T17:50:58+00:00",
	"remoteAddr": "***.***.***.***",
	"user": "*****",
	"app": "PHP",
	"method": "MOVE",
	"url": "/remote.php/dav/uploads/*****/*****/*****",
	"message": "rmdir(/var/www/data/appdata_*****/preview/1): Directory not empty at /var/www/html/lib/private/Files/Storage/Local.php#139",
	"version": "25.0.8.2",
	"exception": {
		"Exception": "Error",
		"Message": "rmdir(/var/www/data/appdata_*****/preview/1): Directory not empty at /var/www/html/lib/private/Files/Storage/Local.php#139",
		"Code": 0,
		"Trace": [
			{
				"function": "onError",
				"class": "OC\\Log\\ErrorHandler",
				"type": "::",
				"args": [
					2,
					"rmdir(/var/www/data/appdata_*****/preview/1): Directory not empty",
					"/var/www/html/lib/private/Files/Storage/Local.php",
					139
				]
			},
			{
				"file": "/var/www/html/lib/private/Files/Storage/Local.php",
				"line": 139,
				"function": "rmdir",
				"args": [
					"/var/www/data/appdata_*****/preview/1"
				]
			},
			{
				"function": "rmdir",
				"class": "OC\\Files\\Storage\\Local",
				"type": "->",
				"args": [
					"appdata_*****/preview"
				]
			},
			{
				"file": "/var/www/html/apps/files_trashbin/lib/Storage.php",
				"line": 193,
				"function": "call_user_func",
				"args": [
					[
						[
							"OC\\Files\\Storage\\LocalRootStorage"
						],
						"rmdir"
					],
					"appdata_*****/preview"
				]
			},
			{
				"file": "/var/www/html/apps/files_trashbin/lib/Storage.php",
				"line": 125,
				"function": "doDelete",
				"class": "OCA\\Files_Trashbin\\Storage",
				"type": "->",
				"args": [
					"appdata_*****/preview",
					"rmdir"
				]
			},
			{
				"file": "/var/www/html/lib/private/Files/View.php",
				"line": 1181,
				"function": "rmdir",
				"class": "OCA\\Files_Trashbin\\Storage",
				"type": "->",
				"args": [
					"appdata_*****/preview"
				]
			},
			{
				"file": "/var/www/html/lib/private/Files/View.php",
				"line": 349,
				"function": "basicOperation",
				"class": "OC\\Files\\View",
				"type": "->",
				"args": [
					"rmdir",
					"/appdata_*****/preview",
					[
						"delete"
					]
				]
			},
			{
				"file": "/var/www/html/lib/private/Files/Node/Folder.php",
				"line": 363,
				"function": "rmdir",
				"class": "OC\\Files\\View",
				"type": "->",
				"args": [
					"/appdata_*****/preview"
				]
			},
			{
				"file": "/var/www/html/lib/private/Files/SimpleFS/SimpleFolder.php",
				"line": 68,
				"function": "delete",
				"class": "OC\\Files\\Node\\Folder",
				"type": "->",
				"args": []
			},
			{
				"file": "/var/www/html/lib/private/Preview/Watcher.php",
				"line": 65,
				"function": "delete",
				"class": "OC\\Files\\SimpleFS\\SimpleFolder",
				"type": "->",
				"args": []
			},
			{
				"file": "/var/www/html/lib/private/Preview/Watcher.php",
				"line": 54,
				"function": "deleteNode",
				"class": "OC\\Preview\\Watcher",
				"type": "->",
				"args": [
					"*** sensitive parameters replaced ***"
				]
			},
			{
				"file": "/var/www/html/lib/private/Preview/WatcherConnector.php",
				"line": 63,
				"function": "postWrite",
				"class": "OC\\Preview\\Watcher",
				"type": "->",
				"args": [
					"*** sensitive parameters replaced ***"
				]
			},
			{
				"function": "OC\\Preview\\{closure}",
				"class": "OC\\Preview\\WatcherConnector",
				"type": "->",
				"args": [
					"*** sensitive parameters replaced ***"
				]
			},
			{
				"file": "/var/www/html/lib/private/Hooks/EmitterTrait.php",
				"line": 106,
				"function": "call_user_func_array",
				"args": [
					[
						"Closure"
					],
					[
						"*** sensitive parameters replaced ***"
					]
				]
			},
			{
				"file": "/var/www/html/lib/private/Hooks/PublicEmitter.php",
				"line": 40,
				"function": "emit",
				"class": "OC\\Hooks\\BasicEmitter",
				"type": "->",
				"args": [
					"\\OC\\Files",
					"postWrite",
					[
						"*** sensitive parameters replaced ***"
					]
				]
			},
			{
				"file": "/var/www/html/lib/private/Files/Node/Root.php",
				"line": 143,
				"function": "emit",
				"class": "OC\\Hooks\\PublicEmitter",
				"type": "->",
				"args": [
					"\\OC\\Files",
					"postWrite",
					[
						"*** sensitive parameters replaced ***"
					]
				]
			},
			{
				"function": "emit",
				"class": "OC\\Files\\Node\\Root",
				"type": "->",
				"args": [
					"\\OC\\Files",
					"postWrite",
					[
						"*** sensitive parameters replaced ***"
					]
				]
			},
			{
				"file": "/var/www/html/lib/private/Files/Node/LazyFolder.php",
				"line": 72,
				"function": "call_user_func_array",
				"args": [
					[
						[
							"OC\\Files\\Node\\Root"
						],
						"emit"
					],
					[
						"\\OC\\Files",
						"postWrite",
						[
							"*** sensitive parameters replaced ***"
						]
					]
				]
			},
			{
				"file": "/var/www/html/lib/private/Files/Node/LazyFolder.php",
				"line": 100,
				"function": "__call",
				"class": "OC\\Files\\Node\\LazyFolder",
				"type": "->",
				"args": [
					"emit",
					[
						"\\OC\\Files",
						"postWrite",
						[
							"*** sensitive parameters replaced ***"
						]
					]
				]
			},
			{
				"file": "/var/www/html/lib/private/Files/Node/HookConnector.php",
				"line": 117,
				"function": "emit",
				"class": "OC\\Files\\Node\\LazyFolder",
				"type": "->",
				"args": [
					"\\OC\\Files",
					"postWrite",
					[
						"*** sensitive parameters replaced ***"
					]
				]
			},
			{
				"file": "/var/www/html/lib/private/legacy/OC_Hook.php",
				"line": 106,
				"function": "postWrite",
				"class": "OC\\Files\\Node\\HookConnector",
				"type": "->",
				"args": [
					[
						"/****/*****/*****/*****.part"
					]
				]
			},
			{
				"file": "/var/www/html/apps/dav/lib/Connector/Sabre/File.php",
				"line": 473,
				"function": "emit",
				"class": "OC_Hook",
				"type": "::",
				"args": [
					"OC_Filesystem",
					"post_write",
					[
						"/****/*****/*****/*****.part"
					]
				]
			},
			{
				"file": "/var/www/html/apps/dav/lib/Connector/Sabre/File.php",
				"line": 398,
				"function": "emitPostHooks",
				"class": "OCA\\DAV\\Connector\\Sabre\\File",
				"type": "->",
				"args": [
					true
				]
			},
			{
				"file": "/var/www/html/apps/dav/lib/Connector/Sabre/Directory.php",
				"line": 151,
				"function": "put",
				"class": "OCA\\DAV\\Connector\\Sabre\\File",
				"type": "->",
				"args": [
					null
				]
			},
			{
				"file": "/var/www/html/3rdparty/sabre/dav/lib/DAV/Tree.php",
				"line": 307,
				"function": "createFile",
				"class": "OCA\\DAV\\Connector\\Sabre\\Directory",
				"type": "->",
				"args": [
					"*****",
					null
				]
			},
			{
				"file": "/var/www/html/3rdparty/sabre/dav/lib/DAV/Tree.php",
				"line": 133,
				"function": "copyNode",
				"class": "Sabre\\DAV\\Tree",
				"type": "->",
				"args": [
					[
						"OCA\\DAV\\Upload\\FutureFile"
					],
					[
						"OCA\\DAV\\Connector\\Sabre\\Directory"
					],
					"*****"
				]
			},
			{
				"file": "/var/www/html/3rdparty/sabre/dav/lib/DAV/Tree.php",
				"line": 163,
				"function": "copy",
				"class": "Sabre\\DAV\\Tree",
				"type": "->",
				"args": [
					"uploads/*****/*****/*****",
					"files/*****/****/*****/*****/*****.part"
				]
			},
			{
				"file": "/var/www/html/apps/dav/lib/Upload/ChunkingPlugin.php",
				"line": 94,
				"function": "move",
				"class": "Sabre\\DAV\\Tree",
				"type": "->",
				"args": [
					"uploads/*****/*****/*****",
					"files/*****/****/*****/*****/*****.part"
				]
			},
			{
				"file": "/var/www/html/apps/dav/lib/Upload/ChunkingPlugin.php",
				"line": 76,
				"function": "performMove",
				"class": "OCA\\DAV\\Upload\\ChunkingPlugin",
				"type": "->",
				"args": [
					"uploads/*****/*****/*****",
					"files/*****/****/*****/*****/*****.part"
				]
			},
			{
				"file": "/var/www/html/3rdparty/sabre/event/lib/WildcardEmitterTrait.php",
				"line": 89,
				"function": "beforeMove",
				"class": "OCA\\DAV\\Upload\\ChunkingPlugin",
				"type": "->",
				"args": [
					"uploads/*****/*****/*****",
					"files/*****/****/*****/*****/*****.part"
				]
			},
			{
				"file": "/var/www/html/3rdparty/sabre/dav/lib/DAV/CorePlugin.php",
				"line": 603,
				"function": "emit",
				"class": "Sabre\\DAV\\Server",
				"type": "->",
				"args": [
					"beforeMove",
					[
						"uploads/*****/*****/*****",
						"files/*****/****/*****/*****/*****.part"
					]
				]
			},
			{
				"file": "/var/www/html/3rdparty/sabre/event/lib/WildcardEmitterTrait.php",
				"line": 89,
				"function": "httpMove",
				"class": "Sabre\\DAV\\CorePlugin",
				"type": "->",
				"args": [
					[
						"Sabre\\HTTP\\Request"
					],
					[
						"Sabre\\HTTP\\Response"
					]
				]
			},
			{
				"file": "/var/www/html/3rdparty/sabre/dav/lib/DAV/Server.php",
				"line": 472,
				"function": "emit",
				"class": "Sabre\\DAV\\Server",
				"type": "->",
				"args": [
					"method:MOVE",
					[
						[
							"Sabre\\HTTP\\Request"
						],
						[
							"Sabre\\HTTP\\Response"
						]
					]
				]
			},
			{
				"file": "/var/www/html/3rdparty/sabre/dav/lib/DAV/Server.php",
				"line": 253,
				"function": "invokeMethod",
				"class": "Sabre\\DAV\\Server",
				"type": "->",
				"args": [
					[
						"Sabre\\HTTP\\Request"
					],
					[
						"Sabre\\HTTP\\Response"
					]
				]
			},
			{
				"file": "/var/www/html/3rdparty/sabre/dav/lib/DAV/Server.php",
				"line": 321,
				"function": "start",
				"class": "Sabre\\DAV\\Server",
				"type": "->",
				"args": []
			},
			{
				"file": "/var/www/html/apps/dav/lib/Server.php",
				"line": 360,
				"function": "exec",
				"class": "Sabre\\DAV\\Server",
				"type": "->",
				"args": []
			},
			{
				"file": "/var/www/html/apps/dav/appinfo/v2/remote.php",
				"line": 35,
				"function": "exec",
				"class": "OCA\\DAV\\Server",
				"type": "->",
				"args": []
			},
			{
				"file": "/var/www/html/remote.php",
				"line": 172,
				"args": [
					"/var/www/html/apps/dav/appinfo/v2/remote.php"
				],
				"function": "require_once"
			}
		],
		"File": "/var/www/html/lib/private/Log/ErrorHandler.php",
		"Line": 92,
		"CustomMessage": "--"
	}
}

Checklist

Code is properly formatted
Sign-off message is added to all commits
Tests (unit, integration, api and/or acceptance) are included
Screenshots before/after for front-end changes
Documentation (manuals or wiki) has been updated or is not required
Backports requested where applicable (ex: critical bugfixes)

Signed-off-by: Akhil <akhil@e.email>

lib/private/Preview/Watcher.php

skjnldsv

Doesn't hurt!

artonge

@come-nc IIRC, you looked into the null file id on some file events. Is it similar?

come-nc · 2023-11-06T09:36:27Z

@come-nc IIRC, you looked into the null file id on some file events. Is it similar?

Not really, here it’s expected for the node to have no id since it’s new, I think. In the cases I looked into it was paths outside the user directory which ended up trigerring events on null paths.

SystemKeeper · 2024-01-19T09:37:33Z

@blizzz backport? 🤔

blizzz · 2024-01-19T15:25:26Z

I understand it was first discovered on 25, so since then everything is affected.

blizzz · 2024-01-19T15:26:52Z

/skjnldsv-backport to stable28

blizzz · 2024-01-19T15:26:57Z

/skjnldsv-backport to stable27

blizzz · 2024-01-19T15:27:07Z

/skjnldsv-backport to stable26

susnux · 2024-01-20T04:49:49Z

/backport to stable28

SystemKeeper · 2024-01-22T09:56:11Z

Hm, does backporting not work if it’s from a fork?

susnux · 2024-01-22T19:56:23Z

Hm, does backporting not work if it’s from a fork?

cc @skjnldsv

popos123 · 2024-06-03T11:07:50Z

hi, i see that fix was implemented in version 29.0.1? becouse i have this bug on the nevest version too

chrisborell · 2024-06-20T00:11:22Z

Still occuring for me in [Nextcloud Hub 8] (29.0.2)

Check if the node has a null ID before deleting in preview watcher

1d767eb

Signed-off-by: Akhil <akhil@e.email>

akhil1508 changed the title ~~Check if the node has a null ID before deleting in preview watcher~~ Fix for previews not being generated sometimes Oct 23, 2023

CarlSchwan reviewed Oct 24, 2023

View reviewed changes

lib/private/Preview/Watcher.php Show resolved Hide resolved

tcitworld approved these changes Oct 25, 2023

View reviewed changes

lib/private/Preview/Watcher.php Show resolved Hide resolved

solracsf added this to the Nextcloud 28 milestone Oct 27, 2023

tcitworld requested review from a team, icewind1991, nfebe and sorbaugh and removed request for a team October 30, 2023 08:10

skjnldsv approved these changes Oct 31, 2023

View reviewed changes

skjnldsv added bug 3. to review Waiting for reviews feature: previews and thumbnails labels Oct 31, 2023

skjnldsv mentioned this pull request Nov 1, 2023

chore: 28.0.0 beta 1 #41228

Merged

artonge requested changes Nov 2, 2023

View reviewed changes

come-nc approved these changes Nov 6, 2023

View reviewed changes

artonge approved these changes Nov 6, 2023

View reviewed changes

This was referenced Nov 6, 2023

28.0.0 beta 2 #41314

Merged

28.0.0 beta 3 #41379

Merged

This was referenced Nov 14, 2023

28.0.0 beta 4 #41477

Merged

28.0.0 RC1 #41621

Merged

blizzz modified the milestones: Nextcloud 28, Nextcloud 29 Nov 23, 2023

blizzz merged commit c4f4c5a into nextcloud:master Jan 18, 2024
34 of 39 checks passed

SystemKeeper mentioned this pull request Jan 22, 2024

[stable28] Fix for previews not being generated sometimes #43037

Merged

This was referenced Jan 22, 2024

[stable27] Fix for previews not being generated sometimes #43038

Merged

[stable26] Fix for previews not being generated sometimes #43039

Merged

blizzz mentioned this pull request Mar 5, 2024

29.0.0 beta 1 #43991

Merged

joshtrichards mentioned this pull request Apr 1, 2024

OCP\Files\NotPermittedException Could not create folder nextcloud/previewgenerator#289

Open

Provide feedback

Saved searches

Use saved searches to filter your results more quickly

Fix for previews not being generated sometimes #41067

Fix for previews not being generated sometimes #41067

akhil1508 commented Oct 23, 2023 •

edited

Loading

skjnldsv left a comment

artonge left a comment

come-nc commented Nov 6, 2023

SystemKeeper commented Jan 19, 2024

blizzz commented Jan 19, 2024

blizzz commented Jan 19, 2024

blizzz commented Jan 19, 2024

blizzz commented Jan 19, 2024

susnux commented Jan 20, 2024

SystemKeeper commented Jan 22, 2024

susnux commented Jan 22, 2024 •

edited

Loading

popos123 commented Jun 3, 2024

chrisborell commented Jun 20, 2024

Fix for previews not being generated sometimes #41067

Fix for previews not being generated sometimes #41067

Conversation

akhil1508 commented Oct 23, 2023 • edited Loading

Summary

Stack trace of the bug

Checklist

skjnldsv left a comment

Choose a reason for hiding this comment

artonge left a comment

Choose a reason for hiding this comment

come-nc commented Nov 6, 2023

SystemKeeper commented Jan 19, 2024

blizzz commented Jan 19, 2024

blizzz commented Jan 19, 2024

blizzz commented Jan 19, 2024

blizzz commented Jan 19, 2024

susnux commented Jan 20, 2024

SystemKeeper commented Jan 22, 2024

susnux commented Jan 22, 2024 • edited Loading

popos123 commented Jun 3, 2024

chrisborell commented Jun 20, 2024

akhil1508 commented Oct 23, 2023 •

edited

Loading

susnux commented Jan 22, 2024 •

edited

Loading