[Bug]: `occ encryption:encrypt-all` corrupts files when quota is 0B (zero)

[kyteinsky]

⚠️ 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

In NC 32 (using stable32 branch), quota is set to 0B for all the users as default and users have files from shares/from the skeleton directory.
Now if the encryption app is enabled and all files are explicitly encrypted, the existing files are corrupted and cannot be opened from the web interface anymore.
Looking them up in the data directory, the files are 0 bytes in size.

-rw-r--r--. 1 www-data www-data   0 Apr 29 09:03 photo-1503991721143-75f95ebf1e55.jpeg

The metadata in NC files is intact for modification date and size, until a files:scan is run, after which size changes to 0 KB.

Steps to reproduce

1. Go to "Accounts" page from top right profile icon as an admin
2. Go to "Account management settings" on the bottom left
3. Set "Default quota" to 0
4. Enable the encryption app: occ app:enable encryption
5. Enable the master key (may not be required): occ encryption:enable-master-key
6. Enable encryption: occ encryption:enable
7. Encrypt all the files: occ encryption:encrypt-all (type 'y' here)

Expected behavior

Either quota should've been ignored and files should've been encrypted in place since they already existed with quota = 0,
or the encryption should fail with an error message saying that the quota is insufficient for the operation.

Nextcloud Server version

32

Operating system

None

PHP engine version

None

Web server

None

Database engine version

None

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

None

Are you using the Nextcloud Server Encryption module?

Encryption is Enabled

What user-backends are you using?

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

Configuration report

{
    "system": {
        "debug": true,
        "profiler": true,
        "apps_paths": [
            {
                "path": "\/var\/www\/html\/apps",
                "url": "\/apps",
                "writable": false
            },
            {
                "path": "\/var\/www\/html\/apps-extra",
                "url": "\/apps-extra",
                "writable": false
            },
            {
                "path": "\/var\/www\/html\/apps-shared",
                "url": "\/apps-shared",
                "writable": false
            },
            {
                "path": "\/var\/www\/html\/apps-writable",
                "url": "\/apps-writable",
                "writable": true
            }
        ],
        "allow_local_remote_servers": true,
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpmode": "smtp",
        "mail_sendmailmode": "smtp",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpport": "1025",
        "skeletondirectory": "\/skeleton",
        "setup_create_db_user": false,
        "loglevel": 2,
        "log_query": false,
        "query_log_file": "\/shared\/log\/querylog-stable32.log",
        "query_log_file_requestid": "yes",
        "diagnostics.logging": false,
        "diagnostics.logging.threshold": 0,
        "log.condition": {
            "apps": [
                "diagnostics",
                "admin_audit"
            ]
        },
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "localhost",
            "nextcloud",
            "stable32.nc.ncweb",
            "192.168.21.9",
            "localhost"
        ],
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "dbtype": "mysql",
        "version": "32.0.8.2",
        "overwrite.cli.url": "http:\/\/stable32.nc.ncweb",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbtableprefix": "oc_",
        "mysql.utf8mb4": true,
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "updater.release.channel": "git",
        "installed": true,
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "lookup_server": "",
        "redis": {
            "host": "***REMOVED SENSITIVE VALUE***",
            "port": 6379
        },
        "memcache.local": "\\OC\\Memcache\\Redis",
        "memcache.locking": "\\OC\\Memcache\\Redis",
        "trusted_proxies": "***REMOVED SENSITIVE VALUE***",
        "theme": "",
        "maintenance": false
    }
}

List of activated Apps

Enabled:
  - cloud_federation_api: 1.16.0
  - comments: 1.22.0
  - contactsinteraction: 1.13.1
  - dashboard: 7.12.0
  - dav: 1.34.2
  - encryption: 2.20.0
  - federatedfilesharing: 1.22.0
  - federation: 1.22.0
  - files: 2.4.0
  - files_reminders: 1.5.0
  - files_sharing: 1.24.1
  - files_trashbin: 1.22.0
  - files_versions: 1.25.0
  - lookup_server_connector: 1.20.0
  - oauth2: 1.20.0
  - profile: 1.1.0
  - provisioning_api: 1.22.0
  - settings: 1.15.1
  - sharebymail: 1.22.0
  - systemtags: 1.22.0
  - theming: 2.7.0
  - twofactor_backupcodes: 1.21.0
  - updatenotification: 1.22.0
  - user_oidc: 8.10.1
  - user_status: 1.12.0
  - viewer: 5.0.0-dev.0
  - weather_status: 1.12.0
  - webhook_listeners: 1.3.0
  - workflowengine: 2.14.0

Nextcloud Signing status

Nextcloud Logs

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Additional info

No response