Backends provided no user object for "federated_share_name"

[mmattel]

Steps to reproduce

1. Use a incoming federated share
2. Use the sync client which syncs this federated share
3. Just wait and watch how the ownCloud errorlog gets filled up over time with error messages

Expected behaviour

No errors logged

Actual behaviour

Recurring entries with errors listed below (fills up the log...)

Server configuration

Operating system: Ubuntu 14.04

Web server: nginx 1.9.14

Database: mysql

PHP version: 5.5.9

ownCloud version: (see ownCloud admin page)
ownCloud 9.0.2 RC1 (daily) Build:2016-04-28T03:03:12+00:00 795f321

Updated from an older ownCloud or fresh install:
This was a fresh setup from tar and updated once, daily channel

Where did you install ownCloud from:
tar

Signing status (ownCloud 9.0 and above):

Datei nicht gefunden
Das ausgewählte Dokument wurde auf dem Server nicht gefunden.
Sie können zur Rückkehr zu ownCloud hier klicken.

List of activated apps:

Enabled:
  - activity: 2.2.1
  - comments: 0.2
  - dav: 0.1.6
  - federatedfilesharing: 0.1.0
  - federation: 0.0.4
  - files: 1.4.4
  - files_external: 0.5.2
  - files_pdfviewer: 0.8.1
  - files_sharing: 0.9.1
  - files_texteditor: 2.1
  - files_trashbin: 0.8.0
  - files_versions: 1.2.0
  - files_videoplayer: 0.9.8
  - firstrunwizard: 1.1
  - gallery: 14.5.0
  - notifications: 0.2.3
  - provisioning_api: 0.4.1
  - systemtags: 0.2
  - templateeditor: 0.1
  - updatenotification: 0.1.0
Disabled:
  - encryption
  - external
  - user_external
  - user_ldap

The content of config/config.php:

{
    "system": {
        "instanceid": "ock982ae3c5s",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "xxxx"
        ],
        "datadirectory": "\/var\/www\/owncloud\/data",
        "overwrite.cli.url": "https:\/\/xxxx",
        "dbtype": "mysql",
        "version": "9.0.2.0",
        "dbname": "owncloud",
        "dbhost": "localhost",
        "dbtableprefix": "oc_",
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "logtimezone": "Europe\/Vienna",
        "installed": true,
        "filelocking.enabled": "true",
        "memcache.local": "\\OC\\Memcache\\Redis",
        "memcache.locking": "\\OC\\Memcache\\Redis",
        "memcache.distributed": "\\OC\\Memcache\\Redis",
        "redis": {
            "host": "localhost",
            "port": 6379,
            "timeout": 0,
            "dbindex": 0
        },
        "assetdirectory": "\/var\/www\/owncloud",
        "asset-pipeline.enabled": true,
        "filesystem_check_changes": 1,
        "preview_max_scale_factor": 1,
        "enabledPreviewProviders": [
            "OC\\Preview\\PNG",
            "OC\\Preview\\JPEG",
            "OC\\Preview\\GIF",
            "OC\\Preview\\Illustrator",
            "OC\\Preview\\Postscript",
            "OC\\Preview\\Photoshop",
            "OC\\Preview\\TIFF",
            "OC\\Preview\\Raw"
        ],
        "loglevel": 2,
        "maintenance": false,
        "mail_smtpmode": "smtp",
        "mail_smtpsecure": "tls",
        "mail_from_address": "owncloud",
        "mail_domain": "xxxx",
        "mail_smtpauthtype": "LOGIN",
        "mail_smtpauth": 1,
        "mail_smtphost": "xxxx",
        "mail_smtpport": "587",
        "mail_smtpname": "***REMOVED SENSITIVE VALUE***",
        "mail_smtppassword": "***REMOVED SENSITIVE VALUE***"
    }
}

Are you using external storage, if yes which one: local/smb/sftp/...
SMB

Are you using encryption: yes/no
No

Are you using an external user-backend, if yes which one: LDAP/ActiveDirectory/Webdav/...
No

Client configuration

Browser: Opera

Operating system: W7x64

Logs

owncloud.log

Error   files   
Backends provided no user object for "federated_share_name"

Error   no app in context
Exception: {"Exception":"OC\\User\\NoUserException","Message":"Backends provided no user object for federated_share_name\/","Code":0,"Trace":"
#0 \/var\/www\/owncloud\/apps\/activity\/lib\/fileshooks.php(214): OC\\Files\\Filesystem::initMountPoints('federated_share_name...')\
n#1 \/var\/www\/owncloud\/apps\/activity\/lib\/fileshooks.php(152): OCA\\Activity\\FilesHooks->getSourcePathAndOwner('\/a_path...')\
n#2 \/var\/www\/owncloud\/apps\/activity\/lib\/fileshooks.php(106): OCA\\Activity\\FilesHooks->addNotificationsForFileAction('\/a_path...', 'file_created', 'created_self', 'created_by')\
n#3 \/var\/www\/owncloud\/apps\/activity\/lib\/fileshooksstatic.php(60): OCA\\Activity\\FilesHooks->fileCreate('\/a_path...')\
n#4 [internal function]: OCA\\Activity\\FilesHooksStatic::fileCreate(Array)\
n#5 \/var\/www\/owncloud\/lib\/private\/hook.php(105): call_user_func(Array, Array)\
n#6 \/var\/www\/owncloud\/apps\/dav\/lib\/connector\/sabre\/file.php(283): OC_Hook::emit('OC_Filesystem', 'post_create', Array)\
n#7 \/var\/www\/owncloud\/apps\/dav\/lib\/connector\/sabre\/file.php(206): OCA\\DAV\\Connector\\Sabre\\File->emitPostHooks(false)\
n#8 \/var\/www\/owncloud\/apps\/dav\/lib\/connector\/sabre\/directory.php(134): OCA\\DAV\\Connector\\Sabre\\File->put(Resource id #48)\
n#9 \/var\/www\/owncloud\/3rdparty\/sabre\/dav\/lib\/DAV\/Server.php(1036): OCA\\DAV\\Connector\\Sabre\\Directory->createFile('2016.06.01 Asse...', Resource id #48)\
n#10 \/var\/www\/owncloud\/3rdparty\/sabre\/dav\/lib\/DAV\/CorePlugin.php(523): Sabre\\DAV\\Server->createFile('Innovation Enga...', Resource id #48, NULL)\
n#11 [internal function]: Sabre\\DAV\\CorePlugin->httpPut(Object(Sabre\\HTTP\\Request), Object(Sabre\\HTTP\\Response))\
n#12 \/var\/www\/owncloud\/3rdparty\/sabre\/event\/lib\/EventEmitterTrait.php(105): call_user_func_array(Array, Array)\
n#13 \/var\/www\/owncloud\/3rdparty\/sabre\/dav\/lib\/DAV\/Server.php(459): Sabre\\Event\\EventEmitter->emit('method:PUT', Array)\
n#14 \/var\/www\/owncloud\/3rdparty\/sabre\/dav\/lib\/DAV\/Server.php(248): Sabre\\DAV\\Server->invokeMethod(Object(Sabre\\HTTP\\Request), Object(Sabre\\HTTP\\Response))\
n#15 \/var\/www\/owncloud\/apps\/dav\/appinfo\/v1\/webdav.php(55): Sabre\\DAV\\Server->exec()\
n#16 \/var\/www\/owncloud\/remote.php(138): require_once('\/var\/w...')\
n#17 {main}","File":"\/var\/www\/owncloud\/lib\/private\/files\/filesystem.php","Line":390}```

[nickvergessen]

This all shounds very much like something really bad happened to your instance. So many "not found exceptions" and stuff :(

[PVince81]

@mmattel is this the same instance with the federated shares from #24909 ?

[mmattel]

I did not had the time to document these things in the past, but things started from day one when I setup the instance from tar and connected to a incoming federated share and used the sync client...
To be said, before this instance, I had a instance with the same setup, but I killed it because I thought the same as you. Now, having a new instance with the same setup, it shows the same issues, so I started to document it...

@PVince81 yes

[PVince81]

@owncloud/sharing

[nickvergessen]

Can also reproduce this. Seems to be a problem with the remote shares, they just wrap the fed.share as storage and so a call to getOwner returns the cloudId of the original owner, instead of the local user owning the files for this instance. That breaks e.g. activities:

{"reqId":"XEAkGVTWNNGCJGATEliC","remoteAddr":"::1","app":"files","message":" Backends provided no user object for admin@localhost\/ownCloud\/9.0\/core\/","level":3,"time":"2016-06-02T13:53:14+00:00","method":"POST","url":"\/ownCloud\/9.0\/core\/index.php\/apps\/files\/ajax\/upload.php","user":"--"}
{"reqId":"XEAkGVTWNNGCJGATEliC","remoteAddr":"::1","app":"no app in context","message":"Exception: {\"Exception\":\"OC\\\\User\\\\NoUserException\",\"Message\":\"Backends provided no user object for admin@localhost\\\/ownCloud\\\/9.0\\\/core\\\/\",\"Code\":0,\"Trace\":\"#0 \\\/home\\\/nickv\\\/ownCloud\\\/9.0\\\/core\\\/appsrepos\\\/activity\\\/lib\\\/fileshooks.php(214): OC\\\\Files\\\\Filesystem::initMountPoints('admin@localhost...')\\n#1 \\\/home\\\/nickv\\\/ownCloud\\\/9.0\\\/core\\\/appsrepos\\\/activity\\\/lib\\\/fileshooks.php(152): OCA\\\\Activity\\\\FilesHooks->getSourcePathAndOwner('\\\/test\\\/test\\\/dexx...')\\n#2 \\\/home\\\/nickv\\\/ownCloud\\\/9.0\\\/core\\\/appsrepos\\\/activity\\\/lib\\\/fileshooks.php(106): OCA\\\\Activity\\\\FilesHooks->addNotificationsForFileAction('\\\/test\\\/test\\\/dexx...', 'file_created', 'created_self', 'created_by')\\n#3 \\\/home\\\/nickv\\\/ownCloud\\\/9.0\\\/core\\\/appsrepos\\\/activity\\\/lib\\\/fileshooksstatic.php(60): OCA\\\\Activity\\\\FilesHooks->fileCreate('\\\/test\\\/test\\\/dexx...')\\n#4 [internal function]: OCA\\\\Activity\\\\FilesHooksStatic::fileCreate(Array)\\n#5 \\\/home\\\/nickv\\\/ownCloud\\\/9.0\\\/core\\\/lib\\\/private\\\/hook.php(105): call_user_func(Array, Array)\\n#6 \\\/home\\\/nickv\\\/ownCloud\\\/9.0\\\/core\\\/lib\\\/private\\\/files\\\/view.php(595): OC_Hook::emit('OC_Filesystem', 'post_create', Array)\\n#7 \\\/home\\\/nickv\\\/ownCloud\\\/9.0\\\/core\\\/lib\\\/private\\\/files\\\/view.php(647): OC\\\\Files\\\\View->emit_file_hooks_post(false, '\\\/test\\\/test\\\/dexx...')\\n#8 \\\/home\\\/nickv\\\/ownCloud\\\/9.0\\\/core\\\/lib\\\/private\\\/files\\\/view.php(988): OC\\\\Files\\\\View->file_put_contents('\\\/test\\\/test\\\/dexx...', Resource id #173)\\n#9 \\\/home\\\/nickv\\\/ownCloud\\\/9.0\\\/core\\\/lib\\\/private\\\/files\\\/filesystem.php(743): OC\\\\Files\\\\View->fromTmpFile('\\\/tmp\\\/phprXmQl2', '\\\/test\\\/test\\\/dexx...')\\n#10 \\\/home\\\/nickv\\\/ownCloud\\\/9.0\\\/core\\\/apps\\\/files\\\/ajax\\\/upload.php(197): OC\\\\Files\\\\Filesystem::fromTmpFile('\\\/tmp\\\/phprXmQl2', '\\\/test\\\/test\\\/dexx...')\\n#11 \\\/home\\\/nickv\\\/ownCloud\\\/9.0\\\/core\\\/lib\\\/private\\\/route\\\/route.php(154) : runtime-created function(1): require_once('\\\/home\\\/nickv\\\/own...')\\n#12 [internal function]: __lambda_func(Array)\\n#13 \\\/home\\\/nickv\\\/ownCloud\\\/9.0\\\/core\\\/lib\\\/private\\\/route\\\/router.php(276): call_user_func('\\\\x00lambda_35', Array)\\n#14 \\\/home\\\/nickv\\\/ownCloud\\\/9.0\\\/core\\\/lib\\\/base.php(882): OC\\\\Route\\\\Router->match('\\\/apps\\\/files\\\/aja...')\\n#15 \\\/home\\\/nickv\\\/ownCloud\\\/9.0\\\/core\\\/index.php(39): OC::handleRequest()\\n#16 {main}\",\"File\":\"\\\/home\\\/nickv\\\/ownCloud\\\/9.0\\\/core\\\/lib\\\/private\\\/files\\\/filesystem.php\",\"Line\":391}","level":3,"time":"2016-06-02T13:53:14+00:00","method":"POST","url":"\/ownCloud\/9.0\/core\/index.php\/apps\/files\/ajax\/upload.php","user":"--"}

Will have a closer look why we did this and what we could do to stop this.

[nickvergessen]

Caused by #20584 which returns a IUser object with the remote cloudId instead of any local user.
That sounds very wrong to me and removes any reliablity from the getOwner() method.

What would be the recommended call to get the last local user if not getOwner()? @icewind1991 @rullzer

[mmattel]

Originally in #24964, but seems to be related to this case and therefore documenting it here too:

I uploaded a file via the shared link (30kb), waited 1min, and tried to delete it - the browser showed a yellow hint telling error deleting file. Deleting it via a user who has direct access to the share worked.

This was the owncloud error message logged: Attempted to initialize mount points for null user and no user in session

{"reqId":"hVP90bz4Ogbh4iAPGanX","remoteAddr":"xx.xx.xx.xx","app":"webdav","message":"Exception: {\"Message\":\"Attempted to initialize mount points for null user and no user in session\",\"Exception\":\"OC\\\\User\\\\NoUserException\",\"Code\":0,\"Trace\":\"
#0 \\\/var\\\/www\\\/owncloud\\\/apps\\\/files_trashbin\\\/lib\\\/trashbin.php(89): OC\\\\Files\\\\Filesystem::initMountPoints(false)\\
n#1 \\\/var\\\/www\\\/owncloud\\\/apps\\\/files_trashbin\\\/lib\\\/trashbin.php(203): OCA\\\\Files_Trashbin\\\\Trashbin::getUidAndFilename('federated_share_folder...')\\
n#2 \\\/var\\\/www\\\/owncloud\\\/apps\\\/files_trashbin\\\/lib\\\/storage.php(160): OCA\\\\Files_Trashbin\\\\Trashbin::move2trash('federated_share_folder...')\\
n#3 \\\/var\\\/www\\\/owncloud\\\/apps\\\/files_trashbin\\\/lib\\\/storage.php(95): OCA\\\\Files_Trashbin\\\\Storage->doDelete('Company Present...', 'unlink')\\
n#4 \\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/files\\\/view.php(1063): OCA\\\\Files_Trashbin\\\\Storage->unlink('Company Present...')\\
n#5 \\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/files\\\/view.php(645): OC\\\\Files\\\\View->basicOperation('unlink', '\\\/proxyconf.pac', Array)\\
n#6 \\\/var\\\/www\\\/owncloud\\\/apps\\\/dav\\\/lib\\\/connector\\\/sabre\\\/file.php(333): OC\\\\Files\\\\View->unlink('\\\/proxyconf.pac')\\
n#7 \\\/var\\\/www\\\/owncloud\\\/3rdparty\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Tree.php(179): OCA\\\\DAV\\\\Connector\\\\Sabre\\\\File->delete()\\
n#8 \\\/var\\\/www\\\/owncloud\\\/3rdparty\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/CorePlugin.php(285): Sabre\\\\DAV\\\\Tree->delete('proxyconf.pac')\\
n#9[internal function]: Sabre\\\\DAV\\\\CorePlugin->httpDelete(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\
n#10 \\\/var\\\/www\\\/owncloud\\\/3rdparty\\\/sabre\\\/event\\\/lib\\\/EventEmitterTrait.php(105): call_user_func_array(Array, Array)\\
n#11 \\\/var\\\/www\\\/owncloud\\\/3rdparty\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(459): Sabre\\\\Event\\\\EventEmitter->emit('method:DELETE', Array)\\
n#12 \\\/var\\\/www\\\/owncloud\\\/3rdparty\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(248): Sabre\\\\DAV\\\\Server->invokeMethod(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\
n#13 \\\/var\\\/www\\\/owncloud\\\/apps\\\/dav\\\/appinfo\\\/v1\\\/publicwebdav.php(82): Sabre\\\\DAV\\\\Server->exec()\\
n#14 \\\/var\\\/www\\\/owncloud\\\/public.php(74): require_once('\\\/var\\\/w...')\\
n#15 {main}\",\"File\":\"\\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/files\\\/filesystem.php\",\"Line\":376,\"User\":false}","level":4,"time":"2016-06-02T20:35:12+02:00","method":"DELETE","url":"\/public.php\/webdav\/proxyconf.pac","user":"--"}

[nickvergessen]

Some more thoughts about this. In the end it makes sense, that the owner is the file owner, as described in #20580

However we need a "give me the first local user" method or something like that, to get activities back.