The Nextcloud admin guide says that output buffering must be turned off
or otherwise PHP will return memory-related errors [1]. As the default
value for this PHP setting is 4096 and thus enabled the Nextcloud setup
is thus misconfigured by default. This misconfiguration will be shown in
the "Security & setup warnings" dialog for the administrator.
Fix this misconfiguration by setting "output_buffering=0" by default.
[1]: https://docs.nextcloud.com/server/stable/admin_manual/configuration_files/big_file_upload_configuration.html#configuring-php
Would otherwise fail with
```
error: A definition for option `systemd.services.auditd.conflicts."[definition 1-entry 1]"' is not of type `string matching the pattern [a-zA-Z0-9@%:_.\-]+[.](service|socket|device|mount|automount|swap|target|path|timer|scope|slice)'. Definition values:
- In `/nix/store/x2khl2yx0vz2i357x7mz5xm1kagql8ag-source/nixos/modules/security/auditd.nix': "shutdown.target "
```
see #277861. as the module list grows the argument size in the
lazy-options nix call grows, eventually reaching a hard limit and
causing the build to fail. writing the list to a file instead and import
it instead of providing it directly circumvents this.
Closes#277206
The bug mentioned above was a symptom of the issue fixed here: when
opening the `forms` app which is installed via `extraApps` (or the
app store) the site wouldn't work because `.mjs` files had the wrong
Content-Type.
The actual problem got fixed already[1], however this config was not
used for stuff from `/nix-apps` & `/store-apps` which had their own
location section with only a `root ;` statement.
In fact, this setup isn't strictly supported by Nextcloud upstream[2],
so to fix this for good, I decided to follow the upstream suggestion for
app directories outside the server root, i.e. linking them back into the
store path.
This means that the module generates a new derivation now with
* `services.nextcloud.package` linked into it via `lndir`.
* under `nix-apps` is a symlink to the link farm containing all apps
from `services.nextcloud.extraApps`.
* under `store-apps` is a symlink to `/var/lib/nextcloud/store-apps`.
Since this is only used in the NixOS module that also configures this
location for imperatively installed apps, this seems an OK thing to
do.
Successfully tested the change on a productive Nextcloud 28.0.1 with
several apps installed via `extraApps` (`forms`, `cospend`, `maps`,
`user_saml` and a few more).
[1] 292c74c7a9
[2] https://docs.nextcloud.com/server/28/admin_manual/apps_management.html#using-custom-app-directories
