uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

nixos/modules/services/web-apps/dex.nix

@@ -0,0 +1,118 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.services.dex;
+  fixClient = client: if client ? secretFile then ((builtins.removeAttrs client [ "secretFile" ]) // { secret = client.secretFile; }) else client;
+  filteredSettings = mapAttrs (n: v: if n == "staticClients" then (builtins.map fixClient v) else v) cfg.settings;
+  secretFiles = flatten (builtins.map (c: if c ? secretFile then [ c.secretFile ] else []) (cfg.settings.staticClients or []));
+
+  settingsFormat = pkgs.formats.yaml {};
+  configFile = settingsFormat.generate "config.yaml" filteredSettings;
+
+  startPreScript = pkgs.writeShellScript "dex-start-pre" (''
+  '' + (concatStringsSep "\n" (builtins.map (file: ''
+    ${pkgs.replace-secret}/bin/replace-secret '${file}' '${file}' /run/dex/config.yaml
+  '') secretFiles)));
+in
+{
+  options.services.dex = {
+    enable = mkEnableOption "the OpenID Connect and OAuth2 identity provider";
+
+    settings = mkOption {
+      type = settingsFormat.type;
+      default = {};
+      example = literalExpression ''
+        {
+          # External url
+          issuer = "http://127.0.0.1:5556/dex";
+          storage = {
+            type = "postgres";
+            config.host = "/var/run/postgres";
+          };
+          web = {
+            http = "127.0.0.1:5556";
+          };
+          enablePasswordDB = true;
+          staticClients = [
+            {
+              id = "oidcclient";
+              name = "Client";
+              redirectURIs = [ "https://example.com/callback" ];
+              secretFile = "/etc/dex/oidcclient"; # The content of `secretFile` will be written into to the config as `secret`.
+            }
+          ];
+        }
+      '';
+      description = ''
+        The available options can be found in
+        <link xlink:href="https://github.com/dexidp/dex/blob/v${pkgs.dex.version}/config.yaml.dist">the example configuration</link>.
+      '';
+    };
+  };
+
+  config = mkIf cfg.enable {
+    systemd.services.dex = {
+      description = "dex identity provider";
+      wantedBy = [ "multi-user.target" ];
+      after = [ "networking.target" ] ++ (optional (cfg.settings.storage.type == "postgres") "postgresql.service");
+
+      serviceConfig = {
+        ExecStart = "${pkgs.dex-oidc}/bin/dex serve /run/dex/config.yaml";
+        ExecStartPre = [
+          "${pkgs.coreutils}/bin/install -m 600 ${configFile} /run/dex/config.yaml"
+          "+${startPreScript}"
+        ];
+        RuntimeDirectory = "dex";
+
+        AmbientCapabilities = "CAP_NET_BIND_SERVICE";
+        BindReadOnlyPaths = [
+          "/nix/store"
+          "-/etc/resolv.conf"
+          "-/etc/nsswitch.conf"
+          "-/etc/hosts"
+          "-/etc/localtime"
+          "-/etc/dex"
+        ];
+        BindPaths = optional (cfg.settings.storage.type == "postgres") "/var/run/postgresql";
+        CapabilityBoundingSet = "CAP_NET_BIND_SERVICE";
+        # ProtectClock= adds DeviceAllow=char-rtc r
+        DeviceAllow = "";
+        DynamicUser = true;
+        LockPersonality = true;
+        MemoryDenyWriteExecute = true;
+        NoNewPrivileges = true;
+        PrivateDevices = true;
+        PrivateMounts = true;
+        # Port needs to be exposed to the host network
+        #PrivateNetwork = true;
+        PrivateTmp = true;
+        PrivateUsers = true;
+        ProcSubset = "pid";
+        ProtectClock = true;
+        ProtectHome = true;
+        ProtectHostname = true;
+        # Would re-mount paths ignored by temporary root
+        #ProtectSystem = "strict";
+        ProtectControlGroups = true;
+        ProtectKernelLogs = true;
+        ProtectKernelModules = true;
+        ProtectKernelTunables = true;
+        ProtectProc = "invisible";
+        RestrictAddressFamilies = [ "AF_INET" "AF_INET6" "AF_UNIX" ];
+        RestrictNamespaces = true;
+        RestrictRealtime = true;
+        RestrictSUIDSGID = true;
+        SystemCallArchitectures = "native";
+        SystemCallFilter = [ "@system-service" "~@privileged @resources @setuid @keyring" ];
+        TemporaryFileSystem = "/:ro";
+        # Does not work well with the temporary root
+        #UMask = "0066";
+      };
+    };
+  };
+
+  # uses attributes of the linked package
+  meta.buildDocsInSandbox = false;
+}