nixos/nextcloud: add test for declaratively defined redis

This is based on the test using redis and postgresql, but it does not
require any imperative configuration after startup; everything is defined
via Nix instead.

nixos/tests/nextcloud/with-declarative-redis.nix

@@ -0,0 +1,103 @@
+import ../make-test-python.nix ({ pkgs, ...}: let
+  adminpass = "hunter2";
+  adminuser = "custom-admin-username";
+in {
+  name = "nextcloud-with-declarative-redis";
+  meta = with pkgs.lib.maintainers; {
+    maintainers = [ eqyiel ];
+  };
+
+  nodes = {
+    # The only thing the client needs to do is download a file.
+    client = { ... }: {};
+
+    nextcloud = { config, pkgs, ... }: {
+      networking.firewall.allowedTCPPorts = [ 80 ];
+
+      services.nextcloud = {
+        enable = true;
+        hostName = "nextcloud";
+        caching = {
+          apcu = false;
+          redis = true;
+          memcached = false;
+        };
+        config = {
+          dbtype = "pgsql";
+          dbname = "nextcloud";
+          dbuser = "nextcloud";
+          dbhost = "/run/postgresql";
+          inherit adminuser;
+          adminpassFile = toString (pkgs.writeText "admin-pass-file" ''
+            ${adminpass}
+          '');
+        };
+
+        extraOptions.redis = {
+          host = "/run/redis/redis.sock";
+          port = 0;
+          dbindex = 0;
+          password = "secret";
+          timeout = 1.5;
+        };
+        extraOptions.memcache = {
+          local = "\OC\Memcache\Redis";
+          locking = "\OC\Memcache\Redis";
+        };
+      };
+
+      services.redis = {
+        enable = true;
+      };
+
+      systemd.services.nextcloud-setup= {
+        requires = ["postgresql.service"];
+        after = [
+          "postgresql.service"
+        ];
+      };
+
+      services.postgresql = {
+        enable = true;
+        ensureDatabases = [ "nextcloud" ];
+        ensureUsers = [
+          { name = "nextcloud";
+            ensurePermissions."DATABASE nextcloud" = "ALL PRIVILEGES";
+          }
+        ];
+      };
+    };
+  };
+
+  testScript = let
+    withRcloneEnv = pkgs.writeScript "with-rclone-env" ''
+      #!${pkgs.runtimeShell}
+      export RCLONE_CONFIG_NEXTCLOUD_TYPE=webdav
+      export RCLONE_CONFIG_NEXTCLOUD_URL="http://nextcloud/remote.php/webdav/"
+      export RCLONE_CONFIG_NEXTCLOUD_VENDOR="nextcloud"
+      export RCLONE_CONFIG_NEXTCLOUD_USER="${adminuser}"
+      export RCLONE_CONFIG_NEXTCLOUD_PASS="$(${pkgs.rclone}/bin/rclone obscure ${adminpass})"
+      "''${@}"
+    '';
+    copySharedFile = pkgs.writeScript "copy-shared-file" ''
+      #!${pkgs.runtimeShell}
+      echo 'hi' | ${pkgs.rclone}/bin/rclone rcat nextcloud:test-shared-file
+    '';
+
+    diffSharedFile = pkgs.writeScript "diff-shared-file" ''
+      #!${pkgs.runtimeShell}
+      diff <(echo 'hi') <(${pkgs.rclone}/bin/rclone cat nextcloud:test-shared-file)
+    '';
+  in ''
+    start_all()
+    nextcloud.wait_for_unit("multi-user.target")
+    nextcloud.succeed("curl -sSf http://nextcloud/login")
+    nextcloud.succeed(
+        "${withRcloneEnv} ${copySharedFile}"
+    )
+    client.wait_for_unit("multi-user.target")
+    client.succeed(
+        "${withRcloneEnv} ${diffSharedFile}"
+    )
+  '';
+})