systemd: Update to 212

Note that systemd no longer depends on dbus, so we're rid of the
cyclic dependency problem between systemd and dbus.

This commit incorporates from wkennington's systemd branch
(203dcff45002a63f6be75c65f1017021318cc839,
1f842558a95947261ece66f707bfa24faf5a9d88).

nixos/modules/system/boot/systemd.nix

@@ -41,6 +41,7 @@ let
       "sigpwr.target"
       "timers.target"
       "paths.target"
+      "rpcbind.target"
 
       # Rescue mode.
       "rescue.target"
@@ -91,10 +92,14 @@ let
       "swap.target"
       "dev-hugepages.mount"
       "dev-mqueue.mount"
+      "proc-sys-fs-binfmt_misc.mount"
       "sys-fs-fuse-connections.mount"
       "sys-kernel-config.mount"
       "sys-kernel-debug.mount"
 
+      # Maintaining state across reboots.
+      "systemd-random-seed.service"
+
       # Hibernate / suspend.
       "hibernate.target"
       "suspend.target"
@@ -119,12 +124,21 @@ let
       "final.target"
       "kexec.target"
       "systemd-kexec.service"
+      "systemd-update-utmp.service"
 
       # Password entry.
       "systemd-ask-password-console.path"
       "systemd-ask-password-console.service"
       "systemd-ask-password-wall.path"
       "systemd-ask-password-wall.service"
+
+      # Slices / containers.
+      "slices.target"
+      "-.slice"
+      "system.slice"
+      "user.slice"
+      "machine.slice"
+      "systemd-machined.service"
     ]
 
     ++ optionals cfg.enableEmergencyMode [
@@ -143,7 +157,6 @@ let
       "sockets.target.wants"
       "local-fs.target.wants"
       "multi-user.target.wants"
-      "shutdown.target.wants"
       "timers.target.wants"
     ];
 
@@ -708,43 +721,5 @@ in
         })
         (filterAttrs (name: service: service.startAt != "") cfg.services);
 
-    # FIXME: These are borrowed from upstream systemd.
-    systemd.services."systemd-update-utmp" =
-      { description = "Update UTMP about System Reboot/Shutdown";
-        wantedBy = [ "sysinit.target" ];
-        after = [ "systemd-remount-fs.service" ];
-        before = [ "sysinit.target" "shutdown.target" ];
-        conflicts = [ "shutdown.target" ];
-        unitConfig = {
-          DefaultDependencies = false;
-          RequiresMountsFor = "/var/log";
-        };
-        serviceConfig = {
-          Type = "oneshot";
-          RemainAfterExit = true;
-          ExecStart = "${systemd}/lib/systemd/systemd-update-utmp reboot";
-          ExecStop = "${systemd}/lib/systemd/systemd-update-utmp shutdown";
-        };
-        restartIfChanged = false;
-      };
-
-    systemd.services."systemd-random-seed" =
-      { description = "Load/Save Random Seed";
-        wantedBy = [ "sysinit.target" "multi-user.target" ];
-        after = [ "systemd-remount-fs.service" ];
-        before = [ "sysinit.target" "shutdown.target" ];
-        conflicts = [ "shutdown.target" ];
-        unitConfig = {
-          DefaultDependencies = false;
-          RequiresMountsFor = "/var/lib";
-        };
-        serviceConfig = {
-          Type = "oneshot";
-          RemainAfterExit = true;
-          ExecStart = "${systemd}/lib/systemd/systemd-random-seed load";
-          ExecStop = "${systemd}/lib/systemd/systemd-random-seed save";
-        };
-      };
-
   };
 }