nixos/paperless-ng: minor improvments

Service:
- Fix misleading comment:
  We could in fact implement password copying as a preStart script by
  amending BindReadOnlyPaths, but adding an extra service is simpler.

Test:
- Add more detailed subtest names
- Simplify date check

nixos/modules/services/misc/paperless-ng.nix

@@ -248,9 +248,7 @@ in
       after = [ "redis-paperless-ng.service" ];
     };
 
-    # Password copying can't be implemented as a privileged preStart script
-    # in 'paperless-ng-server' because 'defaultServiceConfig' limits the filesystem
-    # paths accessible by the service.
+    # Reading the user-provided password file requires root access
     systemd.services.paperless-ng-copy-password = mkIf (cfg.passwordFile != null) {
       requiredBy = [ "paperless-ng-server.service" ];
       before = [ "paperless-ng-server.service" ];

nixos/tests/paperless-ng.nix

@@ -11,9 +11,11 @@ import ./make-test-python.nix ({ lib, ... }: {
   };
 
   testScript = ''
+    import json
+
     machine.wait_for_unit("paperless-ng-consumer.service")
 
-    with subtest("Create test doc"):
+    with subtest("Add a document via the file system"):
         machine.succeed(
             "convert -size 400x40 xc:white -font 'DejaVu-Sans' -pointsize 20 -fill black "
             "-annotate +5+20 'hello world 16-10-2005' /var/lib/paperless/consume/doc.png"
@@ -24,7 +26,7 @@ import ./make-test-python.nix ({ lib, ... }: {
         # Wait until server accepts connections
         machine.wait_until_succeeds("curl -fs localhost:28981")
 
-    with subtest("Create web test doc"):
+    with subtest("Add a document via the web interface"):
         machine.succeed(
             "convert -size 400x40 xc:white -font 'DejaVu-Sans' -pointsize 20 -fill black "
             "-annotate +5+20 'hello web 16-10-2005' /tmp/webdoc.png"
@@ -35,11 +37,8 @@ import ./make-test-python.nix ({ lib, ... }: {
         machine.wait_until_succeeds(
             "(($(curl -u admin:admin -fs localhost:28981/api/documents/ | jq .count) == 2))"
         )
-        assert "2005-10-16" in machine.succeed(
-            "curl -u admin:admin -fs localhost:28981/api/documents/ | jq '.results | .[0] | .created'"
-        )
-        assert "2005-10-16" in machine.succeed(
-            "curl -u admin:admin -fs localhost:28981/api/documents/ | jq '.results | .[1] | .created'"
-        )
+        docs = json.loads(machine.succeed("curl -u admin:admin -fs localhost:28981/api/documents/"))['results']
+        assert "2005-10-16" in docs[0]['created']
+        assert "2005-10-16" in docs[1]['created']
   '';
 })