Docker overlay2 disk mounts not showing up correctly

Steps to reproduce

1. Run Nextcloud with docker v25 or higher
2. Use overlay2 as mount type
3. Go to server info page

Expected behaviour

Disks should show up as expected. Picture with docker v24 and mounts with devicemapper.

Actual behaviour

Disks do not show up. Picture with docker v27 and mounts with overlay2

This issue can be fixed by adding a flag (df -TPk to df -TPka) to https://github.com/nextcloud/serverinfo/blob/master/lib/OperatingSystems/Linux.php#L197

Server configuration

Operating system:
RHEL 9.3

Web server:
NGINX

Database:
MariaDB

PHP version:
8.2.20

Nextcloud version: (see Nextcloud admin page)
28.0.6

Where did you install Nextcloud from:
Docker hub

List of activated apps:

Enabled:
  - activity: 2.20.0
  - circles: 28.0.0
  - cloud_federation_api: 1.11.0
  - comments: 1.18.0
  - contactsinteraction: 1.9.0
  - dav: 1.29.1
  - federatedfilesharing: 1.18.0
  - federation: 1.18.0
  - files: 2.0.0
  - files_pdfviewer: 2.9.0
  - files_reminders: 1.1.0
  - files_sharing: 1.20.0
  - files_trashbin: 1.18.0
  - files_versions: 1.21.0
  - firstrunwizard: 2.17.0
  - logreader: 2.13.0
  - lookup_server_connector: 1.16.0
  - nextcloud_announcements: 1.17.0
  - notifications: 2.16.0
  - oauth2: 1.16.3
  - password_policy: 1.18.0
  - photos: 2.4.0
  - privacy: 1.12.0
  - provisioning_api: 1.18.0
  - recommendations: 2.0.0
  - related_resources: 1.3.0
  - serverinfo: 1.18.0
  - settings: 1.10.1
  - sharebymail: 1.18.0
  - support: 1.11.1
  - survey_client: 1.16.0
  - systemtags: 1.18.0
  - text: 3.9.1
  - theming: 2.3.0
  - twofactor_backupcodes: 1.17.0
  - updatenotification: 1.18.0
  - user_ldap: 1.19.0
  - user_oidc: 1.3.3
  - user_status: 1.8.1
  - viewer: 2.2.0
  - weather_status: 1.8.0
  - workflowengine: 2.10.0
Disabled:
  - admin_audit: 1.18.0
  - b2sharebridge: 4.2.0
  - bruteforcesettings: 2.8.0
  - dashboard: 7.8.0 (installed 7.8.0)
  - encryption: 2.16.0
  - files_external: 1.20.0
  - suspicious_login: 6.0.0
  - twofactor_totp: 10.0.0-beta.2

Nextcloud configuration:

<?php
$CONFIG = array (
  'memcache.local' => '\\OC\\Memcache\\APCu',
  'memcache.locking' => '\\OC\\Memcache\\Redis',
  'memcache.distributed' => '\\OC\\Memcache\\Redis',
  'apps_paths' => 
  array (
    0 => 
    array (
      'path' => '/var/www/html/apps',
      'url' => '/apps',
      'writable' => false,
    ),
    1 => 
    array (
      'path' => '/var/www/html/custom_apps',
      'url' => '/custom_apps',
      'writable' => true,
    ),
  ),
  'upgrade.disable-web' => true,
  'instanceid' => '',
  'passwordsalt' => '',
  'secret' => '',
  'trusted_domains' => 
  array (
    0 => 'dev.b2drop.csc.fi',
  ),
  'datadirectory' => '/var/www/html/data',
  'dbtype' => 'mysql',
  'version' => '28.0.6.1',
  'overwrite.cli.url' => 'https://dev.b2drop.csc.fi',
  'dbname' => 'owncloud',
  'dbhost' => 'mariadb',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'mysql.utf8mb4' => true,
  'dbuser' => '',
  'dbpassword' => '',
  'installed' => true,
  'redis' => 
  array (
    'host' => 'redis',
    'port' => 6379,
  ),
  'user_oidc' => 
  array (
    'auto_provision' => false,
    'single_logout' => false,
  ),
  'remember_login_cookie_lifetime' => 300,
  'session_lifetime' => 60,
  'session_relaxed_expiry' => true,
  'session_keepalive' => false,
  'auto_logout' => false,
  'maintenance_window_start' => 1,
  'theme' => 'b2drop',
  'loglevel' => 2,
  'maintenance' => false,
);

Client configuration

Browser:
Safari 17.5

Operating system:
macOS Sonoma 14.5

Start in lib/OperatingSystems/Linux.php around line 197, where the df -TPk command is used to collect disk information. Reproduce the issue with Docker 25 or higher and overlay2, then verify that the server info page shows the disks as expected. The reported fix is changing the command to include the a flag; confirm the result against the existing devicemapper behavior.