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/databases/mongodb.nix

@@ -0,0 +1,197 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+
+  cfg = config.services.mongodb;
+
+  mongodb = cfg.package;
+
+  mongoCnf = cfg: pkgs.writeText "mongodb.conf"
+  ''
+    net.bindIp: ${cfg.bind_ip}
+    ${optionalString cfg.quiet "systemLog.quiet: true"}
+    systemLog.destination: syslog
+    storage.dbPath: ${cfg.dbpath}
+    ${optionalString cfg.enableAuth "security.authorization: enabled"}
+    ${optionalString (cfg.replSetName != "") "replication.replSetName: ${cfg.replSetName}"}
+    ${cfg.extraConfig}
+  '';
+
+in
+
+{
+
+  ###### interface
+
+  options = {
+
+    services.mongodb = {
+
+      enable = mkEnableOption "the MongoDB server";
+
+      package = mkOption {
+        default = pkgs.mongodb;
+        defaultText = literalExpression "pkgs.mongodb";
+        type = types.package;
+        description = "
+          Which MongoDB derivation to use.
+        ";
+      };
+
+      user = mkOption {
+        type = types.str;
+        default = "mongodb";
+        description = "User account under which MongoDB runs";
+      };
+
+      bind_ip = mkOption {
+        type = types.str;
+        default = "127.0.0.1";
+        description = "IP to bind to";
+      };
+
+      quiet = mkOption {
+        type = types.bool;
+        default = false;
+        description = "quieter output";
+      };
+
+      enableAuth = mkOption {
+        type = types.bool;
+        default = false;
+        description = "Enable client authentication. Creates a default superuser with username root!";
+      };
+
+      initialRootPassword = mkOption {
+        type = types.nullOr types.str;
+        default = null;
+        description = "Password for the root user if auth is enabled.";
+      };
+
+      dbpath = mkOption {
+        type = types.str;
+        default = "/var/db/mongodb";
+        description = "Location where MongoDB stores its files";
+      };
+
+      pidFile = mkOption {
+        type = types.str;
+        default = "/run/mongodb.pid";
+        description = "Location of MongoDB pid file";
+      };
+
+      replSetName = mkOption {
+        type = types.str;
+        default = "";
+        description = ''
+          If this instance is part of a replica set, set its name here.
+          Otherwise, leave empty to run as single node.
+        '';
+      };
+
+      extraConfig = mkOption {
+        type = types.lines;
+        default = "";
+        example = ''
+          storage.journal.enabled: false
+        '';
+        description = "MongoDB extra configuration in YAML format";
+      };
+
+      initialScript = mkOption {
+        type = types.nullOr types.path;
+        default = null;
+        description = ''
+          A file containing MongoDB statements to execute on first startup.
+        '';
+      };
+    };
+
+  };
+
+
+  ###### implementation
+
+  config = mkIf config.services.mongodb.enable {
+    assertions = [
+      { assertion = !cfg.enableAuth || cfg.initialRootPassword != null;
+        message = "`enableAuth` requires `initialRootPassword` to be set.";
+      }
+    ];
+
+    users.users.mongodb = mkIf (cfg.user == "mongodb")
+      { name = "mongodb";
+        isSystemUser = true;
+        group = "mongodb";
+        description = "MongoDB server user";
+      };
+    users.groups.mongodb = mkIf (cfg.user == "mongodb") {};
+
+    environment.systemPackages = [ mongodb ];
+
+    systemd.services.mongodb =
+      { description = "MongoDB server";
+
+        wantedBy = [ "multi-user.target" ];
+        after = [ "network.target" ];
+
+        serviceConfig = {
+          ExecStart = "${mongodb}/bin/mongod --config ${mongoCnf cfg} --fork --pidfilepath ${cfg.pidFile}";
+          User = cfg.user;
+          PIDFile = cfg.pidFile;
+          Type = "forking";
+          TimeoutStartSec=120; # intial creating of journal can take some time
+          PermissionsStartOnly = true;
+        };
+
+        preStart = let
+          cfg_ = cfg // { enableAuth = false; bind_ip = "127.0.0.1"; };
+        in ''
+          rm ${cfg.dbpath}/mongod.lock || true
+          if ! test -e ${cfg.dbpath}; then
+              install -d -m0700 -o ${cfg.user} ${cfg.dbpath}
+              # See postStart!
+              touch ${cfg.dbpath}/.first_startup
+          fi
+          if ! test -e ${cfg.pidFile}; then
+              install -D -o ${cfg.user} /dev/null ${cfg.pidFile}
+          fi '' + lib.optionalString cfg.enableAuth ''
+
+          if ! test -e "${cfg.dbpath}/.auth_setup_complete"; then
+            systemd-run --unit=mongodb-for-setup --uid=${cfg.user} ${mongodb}/bin/mongod --config ${mongoCnf cfg_}
+            # wait for mongodb
+            while ! ${mongodb}/bin/mongo --eval "db.version()" > /dev/null 2>&1; do sleep 0.1; done
+
+          ${mongodb}/bin/mongo <<EOF
+            use admin
+            db.createUser(
+              {
+                user: "root",
+                pwd: "${cfg.initialRootPassword}",
+                roles: [
+                  { role: "userAdminAnyDatabase", db: "admin" },
+                  { role: "dbAdminAnyDatabase", db: "admin" },
+                  { role: "readWriteAnyDatabase", db: "admin" }
+                ]
+              }
+            )
+          EOF
+            touch "${cfg.dbpath}/.auth_setup_complete"
+            systemctl stop mongodb-for-setup
+          fi
+        '';
+        postStart = ''
+            if test -e "${cfg.dbpath}/.first_startup"; then
+              ${optionalString (cfg.initialScript != null) ''
+                ${mongodb}/bin/mongo ${optionalString (cfg.enableAuth) "-u root -p ${cfg.initialRootPassword}"} admin "${cfg.initialScript}"
+              ''}
+              rm -f "${cfg.dbpath}/.first_startup"
+            fi
+        '';
+      };
+
+  };
+
+}