Document occ status and -e option

Signed-off-by: Lee Garrett <lgarrett@rocketjump.eu>

admin_manual/configuration_server/background_jobs_configuration.rst

@@ -127,11 +127,14 @@ This approach requires two files: **nextcloudcron.service** and **nextcloudcron.
 
   [Service]
   User=www-data
+  ExecCondition=php -f /var/www/nextcloud/occ status -e
   ExecStart=/usr/bin/php -f /var/www/nextcloud/cron.php
   KillMode=process
 
 Replace the user ``www-data`` with the user of your http server and ``/var/www/nextcloud/cron.php`` with the location of **cron.php** in your nextcloud directory.
 
+The `ExecCondition` checks that the nextcloud instance is operating normally before running the background job, and skips it if otherwise.
+
 The ``KillMode=process`` setting is necessary for external programs that are started by the cron job to keep running after the cron job has finished.
 
 Note that the **.service** unit file does not need an ``[Install]`` section. Please check your setup because we recommended it in earlier versions of this admin manual.

admin_manual/configuration_server/occ_command.rst

@@ -1100,6 +1100,67 @@ Remove a certificate::
 
 .. _trashbin_label:
 
+Status
+------
+
+Use the status command to retrieve information about the current installation::
+
+ $ sudo -u www-data php occ status
+   - installed: true
+   - version: 25.0.2.3
+   - versionstring: 25.0.2
+   - edition:
+   - maintenance: false
+   - needsDbUpgrade: false
+   - productname: Nextcloud
+   - extendedSupport: false
+
+This information can also be formatted via JSON instead of plain text::
+
+ $ php occ status --output=json_pretty
+ {
+     "installed": true,
+     "version": "25.0.2.3",
+     "versionstring": "25.0.2",
+     "edition": "",
+     "maintenance": false,
+     "needsDbUpgrade": false,
+     "productname": "Nextcloud",
+     "extendedSupport": false
+ }
+
+And finally, the ``-e`` (for exit code) parameter can be used to check
+the state of the nextcloud installation via return code::
+
+ $ php occ status -e
+ $ echo $?
+ 0
+ $ php occ maintenance:mode --on
+ Maintenance mode enabled
+ $ php occ status -e
+ $ echo $?
+ 1
+ $ php occ maintenance:mode --off
+ Maintenance mode disabled
+ $ php occ status -e
+ $ echo $?
+ 0
+
+Note that by default there is no output when run with ``-e``. This is
+intentional, so it can be used in scripts, monitoring checks, and systemd
+units.
+
++-------------+--------------------------------------------------------+
+| Return code | Description                                            |
++=============+========================================================+
+| 0           | normal operation                                       |
++-------------+--------------------------------------------------------+
+| 1           | maintenance mode is enabled; the instance is currently |
+|             | unavailable to users.                                  |
++-------------+--------------------------------------------------------+
+| 2           | ``php occ upgrade`` is required                        |
++-------------+--------------------------------------------------------+
+
 Trashbin
 --------