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/misc/sssd.nix

@@ -0,0 +1,97 @@
+{ config, lib, pkgs, ... }:
+with lib;
+let
+  cfg = config.services.sssd;
+  nscd = config.services.nscd;
+in {
+  options = {
+    services.sssd = {
+      enable = mkEnableOption "the System Security Services Daemon";
+
+      config = mkOption {
+        type = types.lines;
+        description = "Contents of <filename>sssd.conf</filename>.";
+        default = ''
+          [sssd]
+          config_file_version = 2
+          services = nss, pam
+          domains = shadowutils
+
+          [nss]
+
+          [pam]
+
+          [domain/shadowutils]
+          id_provider = proxy
+          proxy_lib_name = files
+          auth_provider = proxy
+          proxy_pam_target = sssd-shadowutils
+          proxy_fast_alias = True
+        '';
+      };
+
+      sshAuthorizedKeysIntegration = mkOption {
+        type = types.bool;
+        default = false;
+        description = ''
+          Whether to make sshd look up authorized keys from SSS.
+          For this to work, the <literal>ssh</literal> SSS service must be enabled in the sssd configuration.
+        '';
+      };
+    };
+  };
+  config = mkMerge [
+    (mkIf cfg.enable {
+      systemd.services.sssd = {
+        description = "System Security Services Daemon";
+        wantedBy    = [ "multi-user.target" ];
+        before = [ "systemd-user-sessions.service" "nss-user-lookup.target" ];
+        after = [ "network-online.target" "nscd.service" ];
+        requires = [ "network-online.target" "nscd.service" ];
+        wants = [ "nss-user-lookup.target" ];
+        restartTriggers = [
+          config.environment.etc."nscd.conf".source
+          config.environment.etc."sssd/sssd.conf".source
+        ];
+        script = ''
+          export LDB_MODULES_PATH+="''${LDB_MODULES_PATH+:}${pkgs.ldb}/modules/ldb:${pkgs.sssd}/modules/ldb"
+          mkdir -p /var/lib/sss/{pubconf,db,mc,pipes,gpo_cache,secrets} /var/lib/sss/pipes/private /var/lib/sss/pubconf/krb5.include.d
+          ${pkgs.sssd}/bin/sssd -D
+        '';
+        serviceConfig = {
+          Type = "forking";
+          PIDFile = "/run/sssd.pid";
+        };
+      };
+
+      environment.etc."sssd/sssd.conf" = {
+        text = cfg.config;
+        mode = "0400";
+      };
+
+      system.nssModules = [ pkgs.sssd ];
+      system.nssDatabases = {
+        group = [ "sss" ];
+        passwd = [ "sss" ];
+        services = [ "sss" ];
+        shadow = [ "sss" ];
+      };
+      services.dbus.packages = [ pkgs.sssd ];
+    })
+
+    (mkIf cfg.sshAuthorizedKeysIntegration {
+    # Ugly: sshd refuses to start if a store path is given because /nix/store is group-writable.
+    # So indirect by a symlink.
+    environment.etc."ssh/authorized_keys_command" = {
+      mode = "0755";
+      text = ''
+        #!/bin/sh
+        exec ${pkgs.sssd}/bin/sss_ssh_authorizedkeys "$@"
+      '';
+    };
+    services.openssh.authorizedKeysCommand = "/etc/ssh/authorized_keys_command";
+    services.openssh.authorizedKeysCommandUser = "nobody";
+  })];
+
+  meta.maintainers = with maintainers; [ bbigras ];
+}