[Bug]: owncloud migrated internal shared files cannot be renamed/changed

[Robert-Riedl]

⚠️ This issue respects the following points: ⚠️

• This is a bug, not a question or a configuration/webserver/proxy issue.
• This issue is not already reported on Github OR Nextcloud Community Forum (I've searched it).
• Nextcloud Server is up to date. See Maintenance and Release Schedule for supported versions.
• I agree to follow Nextcloud's Code of Conduct.

Bug description

After successfully migration/upgrading from OC to NC 33.0.1, old OC Shared Files (with Users/Groups, not link shares) can be accessed but not changed by the receiving user who has "modify" privileges.

i.e. changing a filename throws an error and then the file vanishes on the receiving user.

Steps to reproduce

1. Migrate from OC to NC 33.0.1
2. Login with user "ANXAdmin" that has incoming Shares
3. Navigate Files -> Shared
4. Rename "Screenshot 2026-03-13 at 11.50.09.png" to "Screenshot 2026-03-13 at 11.50.09_TESTA.png"
5. error occurs, file cannot be renamed
6. reload the page
7. shared file is not gone

Expected behavior

The rename should work on the receiving user and update the name for both the receiving and sharing user

Nextcloud Server version

33

Operating system

Debian/Ubuntu

PHP engine version

PHP 8.3

Web server

Apache (supported)

Database engine version

MariaDB

Is this bug present after an update or on a fresh install?

Upgraded to a MAJOR version (ex. 31 to 32)

Are you using the Nextcloud Server Encryption module?

Encryption is Disabled

What user-backends are you using?

• Default user-backend (database)
• LDAP/ Active Directory
• SSO - SAML
• Other

Configuration report

{
    "system": {
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "dbtype": "mysql",
        "installed": true,
        "loglevel": 2,
        "log_type": "file",
        "logfile": "\/var\/www\/vhosts\/pscustomer.anexia-cloudstore.com\/logs\/nextcloud.log",
        "maintenance": false,
        "mail_smtpmode": "smtp",
        "trashbin_retention_obligation": "auto, 30",
        "overwrite.cli.url": "https:\/\/pscustomer.anexia-cloudstore.com",
        "overwriteprotocol": "https",
        "htaccess.RewriteBase": "\/",
        "disable_mobile_push": true,
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "tempdirectory": "\/storage\/pscustomer.anexia-cloudstore.com\/tmp",
        "version": "33.0.1.2",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbtableprefix": "oc_",
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "forcessl": true,
        "logtimezone": "Europe\/Vienna",
        "customclient_desktop": "https:\/\/csclients.anexia-it.com\/",
        "customclient_android": "https:\/\/play.google.com\/store\/apps\/details?id=at.anexia.cloudstore",
        "customclient_ios": "#",
        "enable_previews": true,
        "filelocking.enabled": true,
        "memcache.local": "\\OC\\Memcache\\APCu",
        "memcache.locking": "\\OC\\Memcache\\Redis",
        "memcache.distributed": "\\OC\\Memcache\\Redis",
        "redis": {
            "host": "***REMOVED SENSITIVE VALUE***",
            "port": 6379,
            "timeout": 0,
            "dbindex": 0
        },
        "trusted_domains": [
            "cloudstore.anexia-it.com",
            "anx-cloudstore-www01.anx-cus.net",
            "anx-cloudstore-www02.anx-cus.net",
            "anx-cloudstore-www03.anx-cus.net",
            "pscustomer.anexia-cloudstore.com",
            "cloudstore.anx-cus.net",
            "cloudstoretest1.anexia-it.com"
        ],
        "auth.bruteforce.protection.enabled": false,
        "trusted_proxies": "***REMOVED SENSITIVE VALUE***",
        "share_folder": "\/Shared",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "dbdriveroptions": {
            "1002": "SET wait_timeout = 28800"
        },
        "minimum.supported.desktop.version": "2.2.4",
        "version.hide": true,
        "mysql.utf8mb4": true,
        "theme": ""
    }
}

List of activated Apps

Enabled:
  - activity: 6.0.0-dev.0
  - app_api: 33.0.0
  - bruteforcesettings: 6.0.0-dev.0
  - circles: 33.0.0
  - cloud_federation_api: 1.17.0
  - comments: 1.23.0
  - contactsinteraction: 1.14.1
  - dashboard: 7.13.0
  - dav: 1.36.0
  - federatedfilesharing: 1.23.0
  - federation: 1.23.0
  - files: 2.5.0
  - files_downloadlimit: 5.1.0-dev.0
  - files_pdfviewer: 6.0.0-dev.0
  - files_reminders: 1.6.0
  - files_sharing: 1.25.2
  - files_trashbin: 1.23.0
  - files_versions: 1.26.0
  - logreader: 6.0.0
  - lookup_server_connector: 1.21.0
  - nextcloud_announcements: 5.0.0
  - notifications: 6.0.0
  - oauth2: 1.21.0
  - password_policy: 5.0.0-dev.0
  - photos: 6.0.0-dev.0
  - privacy: 5.0.0-dev.0
  - profile: 1.2.0
  - provisioning_api: 1.23.0
  - recommendations: 6.0.0-dev.0
  - related_resources: 4.0.0-dev.0
  - serverinfo: 5.0.0-dev.0
  - settings: 1.16.0
  - sharebymail: 1.23.0
  - support: 5.0.0
  - survey_client: 5.0.0-dev.0
  - systemtags: 1.23.0
  - text: 7.0.0-dev.3
  - theming: 2.8.0
  - twofactor_backupcodes: 1.22.0
  - twofactor_totp: 15.0.0-dev.0
  - updatenotification: 1.23.0
  - user_status: 1.13.0
  - viewer: 6.0.0-dev.0
  - weather_status: 1.13.0
  - webhook_listeners: 1.5.0
  - workflowengine: 2.15.0
Disabled:
  - admin_audit: 1.23.0
  - encryption: 2.21.0
  - files_external: 1.25.1 (installed 0.7.1)
  - firstrunwizard: 6.0.0-dev.0 (installed 1.0)
  - groupquota: 0.2.4
  - suspicious_login: 11.0.0-dev.0
  - testing: 1.23.0
  - twofactor_nextcloud_notification: 7.0.0
  - user_ldap: 1.24.0

Nextcloud Signing status

Technical information
=====================
The following list covers which files have failed the integrity check. Please read
the previous linked documentation to learn more about the errors and how to fix
them.

Results
=======
- core
	- INVALID_HASH
		- core/Controller/LoginController.php
		- lib/private/AppConfig.php
		- lib/private/Config/UserConfig.php
		- lib/private/Updater.php
		- version.php
	- EXTRA_FILE
		- .donotdelete
		- lib/private/Config/UserConfig.php.orig
		- lib/private/AppConfig.php.orig
		- tests/lib/Config/UserConfigMigrationFallbackTest.php
		- tests/lib/AppConfigMigrationFallbackTest.php
		- anna.patch

Raw output
==========
Array
(
    [core] => Array
        (
            [INVALID_HASH] => Array
                (
                    [core/Controller/LoginController.php] => Array
                        (
                            [expected] => 9c491e463bf86151cc8a1646d07b3fbacdd5067ba97124842aa786be57b74f48ea6c979f957e356dfa0943139c10778962a56b268f7c3283d9196de8a983c6b9
                            [current] => c1a2783dae6a9a1f2b744a6e1cf62201dc654475cf9aa5eae2cbb7d8c658fff0e8b4411f1a27bba079cda921110331fedba68d5f49b79585ae999f9ce945c6b6
                        )

                    [lib/private/AppConfig.php] => Array
                        (
                            [expected] => 8a61f52560e1edfe4a22a9633729ff4f4fec18de202a4a63efa0219d2be042645028990d3e8056bb70f7c78240ee54017511e0fe58bbec2ee5da07a91a66d24d
                            [current] => f739c28f9c3e6d32db9167e3e37b9c47a0b45dead2f316faeedc8c68338317df5d0cf12e8b554ae1ef45558b976326952cd39cf48046a08f1974df63b20b5a06
                        )

                    [lib/private/Config/UserConfig.php] => Array
                        (
                            [expected] => 2b1f5766b9ac1b3da32a09fe47187f3deeabaf4a62f39f540c5e9800d8b5104f1d852fc29c5e6f6930aa258838df7a3d080592591931fc0c1fd97f53a2bf09cf
                            [current] => e8d982f22727b934ae24e667e46ebf001589e558d100ac77c0ef6a45de783a0f40f8813e6220ffe1267c20cfea19a438bd36666492faa4efed32cdb9bc35cf16
                        )

                    [lib/private/Updater.php] => Array
                        (
                            [expected] => fddbf8f4f0f35d188d251f7b996ad4d957de3a0a30a792994fbd3fc7fa7553ab00b02bfbc2feeece04dbbca1e724de188b3b397d0bc5b4930257a2e38ce9dc08
                            [current] => b079a0bcceb74867fd5d9470c3981caa617aa76859543125c69811ca43f872fd3f8152e6db035c9e85f754440fde0c1eb375875dbaf7f607373f5ae302a18bb3
                        )

                    [version.php] => Array
                        (
                            [expected] => 51f4b00a33f34f4175207f4ad13690bf9c3736dbb898340bfd9ced0d41f2556bfe879fb9f4eda56c4157322b973905c1673a8e44101a0e098780061508cc2b4b
                            [current] => c6316b79ab9dbae69ad397161f2c38bb9bdef403202f9fc70826cdc2ff8bb1e1d04666e9f061914e887b4bf7fe84ab7937b0485c41ec483244bd82c666c2abc1
                        )

                )

            [EXTRA_FILE] => Array
                (
                    [.donotdelete] => Array
                        (
                            [expected] => 
                            [current] => cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e
                        )

                    [lib/private/Config/UserConfig.php.orig] => Array
                        (
                            [expected] => 
                            [current] => 2b1f5766b9ac1b3da32a09fe47187f3deeabaf4a62f39f540c5e9800d8b5104f1d852fc29c5e6f6930aa258838df7a3d080592591931fc0c1fd97f53a2bf09cf
                        )

                    [lib/private/AppConfig.php.orig] => Array
                        (
                            [expected] => 
                            [current] => 8a61f52560e1edfe4a22a9633729ff4f4fec18de202a4a63efa0219d2be042645028990d3e8056bb70f7c78240ee54017511e0fe58bbec2ee5da07a91a66d24d
                        )

                    [tests/lib/Config/UserConfigMigrationFallbackTest.php] => Array
                        (
                            [expected] => 
                            [current] => 692923ff9df63aba51576a1e75b6caee0a2cf4eaddb06738ddac18fb90bb44f9634b340124a126b3fc6418da2ae4fcc3e1f0c84dbd52853a18309268369e9df6
                        )

                    [tests/lib/AppConfigMigrationFallbackTest.php] => Array
                        (
                            [expected] => 
                            [current] => 75ffdc1cfd88eefed60f34b66862c52e97385894940005209d332a7ac763ba459ee2103f1037beb77322672da193c96714a7a000283fc0addb843571879d0726
                        )

                    [anna.patch] => Array
                        (
                            [expected] => 
                            [current] => 833e92b201f781acb4180af8469f378bb2041932359dda235500dd209fb9de8372cc5fb89cf0e5249f3b2970c2780c712008b59a84106da5f143dc08f2b0cd5b
                        )

                )

        )

)

Nextcloud Logs

{"reqId":"qoQigx4XsJyeUocdiFtP","level":3,"time":"2026-04-21T16:30:28+02:00","remoteAddr":"202.61.208.66","user":"ANXAdmin","app":"no app in context","method":"MOVE","url":"/remote.php/dav/files/ANXAdmin/Shared/Screenshot%202026-03-13%20at%2011.50.09.png","scriptName":"/remote.php","message":"/ANXAdmin/files/Shared/Screenshot 2026-03-13 at 11.50.09_TESTA.png","userAgent":"Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:136.0) Gecko/20100101 Firefox/136.0","version":"33.0.1.2","exception":{"Exception":"OCP\\Files\\NotFoundException","Message":"/ANXAdmin/files/Shared/Screenshot 2026-03-13 at 11.50.09_TESTA.png","Code":0,"Trace":[{"file":"/var/www/vhosts/pscustomer.anexia-cloudstore.com/htdocs/lib/private/Files/Node/LazyFolder.php","line":139,"function":"get","class":"OC\\Files\\Node\\Root","type":"->","args":["/ANXAdmin/files/Shared/Screenshot 2026-03-13 at 11.50.09_TESTA.png"]},{"file":"/var/www/vhosts/pscustomer.anexia-cloudstore.com/htdocs/apps/files_sharing/lib/Updater.php","line":51,"function":"get","class":"OC\\Files\\Node\\LazyFolder","type":"->","args":["/Shared/Screenshot 2026-03-13 at 11.50.09_TESTA.png"]},{"file":"/var/www/vhosts/pscustomer.anexia-cloudstore.com/htdocs/apps/files_sharing/lib/Updater.php","line":26,"function":"moveShareInOrOutOfShare","class":"OCA\\Files_Sharing\\Updater","type":"::","args":["/Shared/Screenshot 2026-03-13 at 11.50.09_TESTA.png"]},{"file":"/var/www/vhosts/pscustomer.anexia-cloudstore.com/htdocs/lib/private/legacy/OC_Hook.php","line":85,"function":"renameHook","class":"OCA\\Files_Sharing\\Updater","type":"::","args":[{"oldpath":"/Shared/Screenshot 2026-03-13 at 11.50.09.png","newpath":"/Shared/Screenshot 2026-03-13 at 11.50.09_TESTA.png"}]},{"file":"/var/www/vhosts/pscustomer.anexia-cloudstore.com/htdocs/lib/private/Files/View.php","line":836,"function":"emit","class":"OC_Hook","type":"::","args":["OC_Filesystem","post_rename",{"oldpath":"/Shared/Screenshot 2026-03-13 at 11.50.09.png","newpath":"/Shared/Screenshot 2026-03-13 at 11.50.09_TESTA.png"}]},{"file":"/var/www/vhosts/pscustomer.anexia-cloudstore.com/htdocs/apps/dav/lib/Connector/Sabre/Node.php","line":127,"function":"rename","class":"OC\\Files\\View","type":"->","args":["/Shared/Screenshot 2026-03-13 at 11.50.09.png","/Shared/Screenshot 2026-03-13 at 11.50.09_TESTA.png"]},{"file":"/var/www/vhosts/pscustomer.anexia-cloudstore.com/htdocs/3rdparty/sabre/dav/lib/DAV/Tree.php","line":171,"function":"setName","class":"OCA\\DAV\\Connector\\Sabre\\Node","type":"->","args":["Screenshot 2026-03-13 at 11.50.09_TESTA.png"]},{"file":"/var/www/vhosts/pscustomer.anexia-cloudstore.com/htdocs/3rdparty/sabre/dav/lib/DAV/CorePlugin.php","line":612,"function":"move","class":"Sabre\\DAV\\Tree","type":"->","args":["files/ANXAdmin/Shared/Screenshot 2026-03-13 at 11.50.09.png","files/ANXAdmin/Shared/Screenshot 2026-03-13 at 11.50.09_TESTA.png"]},{"file":"/var/www/vhosts/pscustomer.anexia-cloudstore.com/htdocs/3rdparty/sabre/event/lib/WildcardEmitterTrait.php","line":89,"function":"httpMove","class":"Sabre\\DAV\\CorePlugin","type":"->","args":[{"__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]},{"file":"/var/www/vhosts/pscustomer.anexia-cloudstore.com/htdocs/3rdparty/sabre/dav/lib/DAV/Server.php","line":472,"function":"emit","class":"Sabre\\DAV\\Server","type":"->","args":["method:MOVE",[{"__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]]},{"file":"/var/www/vhosts/pscustomer.anexia-cloudstore.com/htdocs/apps/dav/lib/Connector/Sabre/Server.php","line":212,"function":"invokeMethod","class":"Sabre\\DAV\\Server","type":"->","args":[{"__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]},{"file":"/var/www/vhosts/pscustomer.anexia-cloudstore.com/htdocs/apps/dav/lib/Server.php","line":427,"function":"start","class":"OCA\\DAV\\Connector\\Sabre\\Server","type":"->","args":[]},{"file":"/var/www/vhosts/pscustomer.anexia-cloudstore.com/htdocs/apps/dav/appinfo/v2/remote.php","line":25,"function":"exec","class":"OCA\\DAV\\Server","type":"->","args":[]},{"file":"/var/www/vhosts/pscustomer.anexia-cloudstore.com/htdocs/remote.php","line":151,"args":["/var/www/vhosts/pscustomer.anexia-cloudstore.com/htdocs/apps/dav/appinfo/v2/remote.php"],"function":"require_once"}],"File":"/var/www/vhosts/pscustomer.anexia-cloudstore.com/htdocs/lib/private/Files/Node/Root.php","Line":173,"message":"/ANXAdmin/files/Shared/Screenshot 2026-03-13 at 11.50.09_TESTA.png","exception":"{\"class\":\"OCP\\Files\\NotFoundException\",\"message\":\"/ANXAdmin/files/Shared/Screenshot 2026-03-13 at 11.50.09_TESTA.png\",\"code\":0,\"file\":\"/var/www/vhosts/pscustomer.anexia-cloudstore.com/htdocs/lib/private/Files/Node/Root.php:173\",\"trace\":\"#0 /var/www/vhosts/pscustomer.anexia-cloudstore.com/htdocs/lib/private/Files/Node/LazyFolder.php(139): OC\\Files\\Node\\Root->get('/ANXAdmin/files...')\\n#1 /var/www/vhosts/pscustomer.anexia-cloudstore.com/htdocs/apps/files_sharing/lib/Updater.php(51): OC\\Files\\Node\\LazyFolder->get('/Shared/Screens...')\\n#2 /var/www/vhosts/pscustomer.anexia-cloudstore.com/htdocs/apps/files_sharing/lib/Updater.php(26): OCA\\Files_Sharing\\Updater::moveShareInOrOutOfShare('/Shared/Screens...')\\n#3 /var/www/vhosts/pscustomer.anexia-cloudstore.com/htdocs/lib/private/legacy/OC_Hook.php(85): OCA\\Files_Sharing\\Updater::renameHook(Array)\\n#4 /var/www/vhosts/pscustomer.anexia-cloudstore.com/htdocs/lib/private/Files/View.php(836): OC_Hook::emit('OC_Filesystem', 'post_rename', Array)\\n#5 /var/www/vhosts/pscustomer.anexia-cloudstore.com/htdocs/apps/dav/lib/Connector/Sabre/Node.php(127): OC\\Files\\View->rename('/Shared/Screens...', '/Shared/Screens...')\\n#6 /var/www/vhosts/pscustomer.anexia-cloudstore.com/htdocs/3rdparty/sabre/dav/lib/DAV/Tree.php(171): OCA\\DAV\\Connector\\Sabre\\Node->setName('Screenshot 2026...')\\n#7 /var/www/vhosts/pscustomer.anexia-cloudstore.com/htdocs/3rdparty/sabre/dav/lib/DAV/CorePlugin.php(612): Sabre\\DAV\\Tree->move('files/ANXAdmin/...', 'files/ANXAdmin/...')\\n#8 /var/www/vhosts/pscustomer.anexia-cloudstore.com/htdocs/3rdparty/sabre/event/lib/WildcardEmitterTrait.php(89): Sabre\\DAV\\CorePlugin->httpMove(Object(Sabre\\HTTP\\Request), Object(Sabre\\HTTP\\Response))\\n#9 /var/www/vhosts/pscustomer.anexia-cloudstore.com/htdocs/3rdparty/sabre/dav/lib/DAV/Server.php(472): Sabre\\DAV\\Server->emit('method:MOVE', Array)\\n#10 /var/www/vhosts/pscustomer.anexia-cloudstore.com/htdocs/apps/dav/lib/Connector/Sabre/Server.php(212): Sabre\\DAV\\Server->invokeMethod(Object(Sabre\\HTTP\\Request), Object(Sabre\\HTTP\\Response))\\n#11 /var/www/vhosts/pscustomer.anexia-cloudstore.com/htdocs/apps/dav/lib/Server.php(427): OCA\\DAV\\Connector\\Sabre\\Server->start()\\n#12 /var/www/vhosts/pscustomer.anexia-cloudstore.com/htdocs/apps/dav/appinfo/v2/remote.php(25): OCA\\DAV\\Server->exec()\\n#13 /var/www/vhosts/pscustomer.anexia-cloudstore.com/htdocs/remote.php(151): require_once('/var/www/vhosts...')\\n#14 {main}\"}","CustomMessage":"/ANXAdmin/files/Shared/Screenshot 2026-03-13 at 11.50.09_TESTA.png"},"id":"69e7978dde2b8"}
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Additional info

this patch has been applied https://patch-diff.githubusercontent.com/raw/nextcloud/server/pull/59677.patch

[Robert-Riedl]

cron.php has been executed and some occ commands as well

files:scan --all
sharing:delete-orphan-shares

[anx-ag]

Hi there,

I've run Claude Code over this issue and it found a different approach to the fix - sharing it here in the hope, that it helps to further diagnose the issue:

Bug Analysis: ownCloud-migrated shared files cannot be renamed (#59791)

Summary

When a share recipient renames a received shared file (user or group share) that was migrated
from ownCloud, the file appears to vanish from their view and an HTTP 500 error is returned.
The rename silently corrupts the virtual file system state due to a bug in SharedMount::moveMount().

Root Cause Chain

Step 1 – WebDAV MOVE triggers View::rename()

When ANXAdmin renames /Shared/Screenshot.png → /Shared/Screenshot_TESTA.png,
View::rename() detects that the source is the root of a SharedMount (internalPath === '')
and calls moveMount() instead of the underlying storage rename:

// lib/private/Files/View.php:808
if ($internalPath1 === '') {
    $result = $mount1->moveMount($absolutePath2);
    $manager->moveMount($sourceMountPoint, $mount1->getMountPoint()); // uses updated mount point

Step 2 – SharedMount::moveMount() silently fails but returns true

File: apps/files_sharing/lib/SharedMount.php:100

public function moveMount($target) {
    $relTargetPath = $this->stripUserFilesPath($target);
    $share = $this->storage->getShare();
    $result = true;   // always true – never updated on failure

    try {
        $this->updateFileTarget($relTargetPath, $share);  // can throw
        $this->setMountPoint($target);     // never reached if above throws
        $this->storage->setMountPoint($relTargetPath);
    } catch (\Exception $e) {
        Server::get(LoggerInterface::class)->error(...);
        // BUG: $result stays true; mount point was NOT moved
    }

    return $result;  // always returns true, even on failure
}

Step 3 – What throws inside updateFileTarget()?

File: apps/files_sharing/lib/SharedMount.php:59

private function updateFileTarget($newPath, &$share) {
    $share->setTarget($newPath);
    foreach ($this->groupedShares as $tmpShare) {
        $tmpShare->setTarget($newPath);
        Server::get(\OCP\Share\IManager::class)->moveShare($tmpShare, $this->user->getUID());
        // ^ throws InvalidArgumentException for group shares whose group no longer exists
    }
    $this->eventDispatcher->dispatchTyped(new InvalidateMountCacheEvent($this->user)); // never reached
}

Manager::moveShare() validates group existence before updating the DB:

// lib/private/Share20/Manager.php:1189
if ($share->getShareType() === IShare::TYPE_GROUP) {
    $sharedWith = $this->groupManager->get($share->getSharedWith());
    if (is_null($sharedWith)) {
        throw new \InvalidArgumentException('Group "X" does not exist');
    }
    ...
}

For ownCloud-migrated group shares, the original group may have been renamed or removed in
Nextcloud. The share record (oc_share.share_with) still holds the old group name, so this
validation throws.

Step 4 – Silent corruption of VFS state

Because updateFileTarget() throws before $this->setMountPoint($target) is reached:

• The in-memory mount point is not updated → mount stays at the old path
• moveMount() returns true anyway
• Back in View::rename(), $mount1->getMountPoint() still returns the old path
• $manager->moveMount(oldPath, oldPath) is a no-op
• No post_rename hook is suppressed – it fires with the new path

Step 5 – Hook execution swallows the first NotFoundException

Updater::renameHook() calls moveShareInOrOutOfShare(newPath) which calls
$userFolder->get(newPath). Because the mount is still at the old path, Root::get()
throws OCP\Files\NotFoundException. OC_Hook::emit() catches and logs it but does not
re-throw it (only HintException / ServerNotAvailableException propagate):

// lib/private/legacy/OC_Hook.php:88
} catch (Exception $e) {
    self::$thrownExceptions[] = $e;
    Server::get(LoggerInterface::class)->error($e->getMessage(), ...);
    if ($e instanceof HintException) { throw $e; }
    if ($e instanceof ServerNotAvailableException) { throw $e; }
    // NotFoundException → swallowed
}

Note: PR #59677 added a try-catch inside moveShareInOrOutOfShare to suppress this log
entry, but that does not fix the underlying silent-failure in moveMount().

Step 6 – refreshInfo() exposes the corruption as HTTP 500

Back in Node::setName(), because rename() returned a truthy value (not false):

// apps/dav/lib/Connector/Sabre/Node.php:146
if ($this->fileView->rename($this->path, $newPath) === false) {
    throw new Exception('Failed to rename...');
}
$this->path = $newPath;
$this->refreshInfo();   // throws NotFoundException → Sabre\DAV\Exception → HTTP 500

refreshInfo() cannot resolve the new path (mount still at old path) → the DAV layer returns
a 500 to the client → the file appears to vanish from the web UI.

---

Affected Files

File	Location	Issue
apps/files_sharing/lib/SharedMount.php	moveMount() line 110	$result never set to false on exception
apps/files_sharing/lib/SharedMount.php	updateFileTarget() line 64	moveShare() throws for non-existent groups (migrated OC shares)
lib/private/Share20/Manager.php	moveShare() line 1190	Group existence check blocks orphaned-group shares

---

Proposed Fix

Fix 1 – Make moveMount() failures explicit (critical, minimal)

Set $result = false in the catch block so that View::rename() correctly returns false,
Node::setName() throws a clean exception, and the file stays visible at its original path:

// apps/files_sharing/lib/SharedMount.php
} catch (\Exception $e) {
    Server::get(LoggerInterface::class)->error(
        'Could not rename mount point for shared folder "' . $this->getMountPoint() . '" to "' . $target . '"',
        ['app' => 'files_sharing', 'exception' => $e]
    );
    $result = false;   // ← add this line
}

Effect: Rename now fails with a proper error instead of silently corrupting VFS state.
The file remains accessible at its original path.

Fix 2 – Handle orphaned group shares from OC migrations (complete fix)

Catch InvalidArgumentException from moveShare() for group shares specifically, and fall back
to calling the share provider's move() directly – bypassing the group-existence validation.
This is safe because the mount was already established (the user has proven access).

// apps/files_sharing/lib/SharedMount.php
use OCP\Share\IProviderFactory;

private function updateFileTarget($newPath, &$share) {
    $share->setTarget($newPath);

    foreach ($this->groupedShares as $tmpShare) {
        $tmpShare->setTarget($newPath);
        try {
            Server::get(\OCP\Share\IManager::class)->moveShare($tmpShare, $this->user->getUID());
        } catch (\InvalidArgumentException $e) {
            // For group shares migrated from ownCloud the original group may no longer exist.
            // The mount is already established so we bypass the group-existence check and
            // update the DB record directly via the share provider (same logic as Manager::moveShare,
            // minus the validation). Re-throw for non-group shares where this is unexpected.
            if ($tmpShare->getShareType() !== IShare::TYPE_GROUP) {
                throw $e;
            }
            Server::get(LoggerInterface::class)->warning(
                'Group share "' . $tmpShare->getId() . '" references a non-existent group; '
                . 'updating file_target directly to allow rename.',
                ['app' => 'files_sharing', 'exception' => $e]
            );
            [$providerId] = explode(':', $tmpShare->getFullId(), 2);
            Server::get(IProviderFactory::class)->getProvider($providerId)
                ->move($tmpShare, $this->user->getUID());
        }
    }

    $this->eventDispatcher->dispatchTyped(new InvalidateMountCacheEvent($this->user));
}

Effect: Rename succeeds for the current session AND the file_target in oc_share is
updated, so future logins also see the file at the correct new path.

---

Testing Scenarios

1. Migrated OC group share, group still exists → no change in behaviour, rename works as before
2. Migrated OC group share, group deleted/renamed → Fix 2 updates DB directly, rename succeeds
3. Migrated OC user share → Fix 1 ensures clean failure if moveShare ever throws; normally works
4. Native Nextcloud share → no change in behaviour

Related

• PR fix(appconfig,userconfig): restore pre-migration fallback for ownCloud migration #59677 – added try-catch in Updater::moveShareInOrOutOfShare (treats the symptom, not the cause)

Suggested Patch

diff --git a/apps/files_sharing/lib/SharedMount.php b/apps/files_sharing/lib/SharedMount.php
index 9dc3faa3628..71b2ab9bf2b 100644
--- a/apps/files_sharing/lib/SharedMount.php
+++ b/apps/files_sharing/lib/SharedMount.php
@@ -18,6 +18,7 @@ use OCP\Files\Storage\IStorageFactory;
 use OCP\IDBConnection;
 use OCP\IUser;
 use OCP\Server;
+use OCP\Share\IProviderFactory;
 use OCP\Share\IShare;
 use Psr\Log\LoggerInterface;
 
@@ -61,7 +62,28 @@ class SharedMount extends MountPoint implements MoveableMount, ISharedMountPoint
 
 		foreach ($this->groupedShares as $tmpShare) {
 			$tmpShare->setTarget($newPath);
-			Server::get(\OCP\Share\IManager::class)->moveShare($tmpShare, $this->user->getUID());
+			try {
+				Server::get(\OCP\Share\IManager::class)->moveShare($tmpShare, $this->user->getUID());
+			} catch (\InvalidArgumentException $e) {
+				// For group shares migrated from ownCloud the original group may no longer
+				// exist in Nextcloud. Manager::moveShare() rejects this with an
+				// InvalidArgumentException. Since the mount is already established the user
+				// has proven access, so we bypass the group-existence validation and update
+				// the DB record directly via the share provider.
+				// Re-throw for non-group shares where this situation is not expected.
+				if ($tmpShare->getShareType() !== IShare::TYPE_GROUP) {
+					throw $e;
+				}
+				Server::get(LoggerInterface::class)->warning(
+					'Group share "' . $tmpShare->getId() . '" references a non-existent group; '
+					. 'updating file_target directly to allow rename of migrated share.',
+					['app' => 'files_sharing', 'exception' => $e]
+				);
+				[$providerId] = explode(':', $tmpShare->getFullId(), 2);
+				Server::get(IProviderFactory::class)
+					->getProvider($providerId)
+					->move($tmpShare, $this->user->getUID());
+			}
 		}
 
 		$this->eventDispatcher->dispatchTyped(new InvalidateMountCacheEvent($this->user));
@@ -115,6 +137,7 @@ class SharedMount extends MountPoint implements MoveableMount, ISharedMountPoint
 					'exception' => $e,
 				]
 			);
+			$result = false;
 		}
 
 		return $result;