Force this option to false. Leaving this as true (currently the default)
is dangerous. If the TT-RSS installation upgrades itself to a newer
version requiring a schema update, the installation will break the next
time the TT-RSS systemd service is restarted.
Ideally, the installation itself should be immutable (see
https://github.com/NixOS/nixpkgs/issues/55300).
Without this line, attempting to copy and paste non-ASCII characters
will result in error messages like the following (and pasting from the
server to the client will not work):
```
CLIPBOARD clipboard_send_data_response_for_text: 823 : ERROR: clipboard_send_data_response_for_text: bad string
```
Move Subsonic state directory from `/var/subsonic` to
`/var/lib/subsonic`, since the general convention is for each
application to put its state directory there.
Also, automatically set the home directory of the `subsonic` user to the
value of `config.services.subsonic.home`, rather than setting it to a
value hardcoded in the module. This keeps the home directory of the
`subsonic` user and the state directory for the Subsonic application in
sync.
Update snapshot to avoid rust-lang/cargo#976, which otherwise breaks the
build.
Also move the `cargoSnapshot` derivation inside a set in
pkgs/top-level/all-packages.nix in order to hide the `cargo-snapshot`
packages from `nix-env -qa`, since it's only used to build the `cargo`
package.
Robert Irelan