nixos/systemd/repart: add Varlink socket

This enables the ability to use systemd-repart over Varlink at
/run/systemd/io.systemd.Repart.

Change-Id: Ia74fdf8c2cbc4ec52994ba8ceb5796acc731abd3
Signed-off-by: Raito Bezarius <masterancpp@gmail.com>

nixos/modules/system/boot/systemd.nix

@@ -209,6 +209,11 @@ let
     "dbus-org.freedesktop.portable1.service"
     "systemd-portabled.service"
   ]
+  ++ optionals cfg.package.withRepart [
+    # Varlink APIs
+    "systemd-repart@.service"
+    "systemd-repart.socket"
+  ]
   ++ [
     "systemd-exit.service"
     "systemd-update-done.service"

nixos/modules/system/boot/systemd/repart.nix

@@ -157,6 +157,12 @@ in
     boot.initrd.systemd = lib.mkIf initrdCfg.enable {
       additionalUpstreamUnits = [
         "systemd-repart.service"
+        # Varlink APIs
+        # NOTE: compared to stage 2 where the IPC is enabled in the global location, initrd
+        # might be optimized to keep away the repart binary.
+        # As a result, we enable repart IPC in the initrd only if repart is enabled in the initrd.
+        "systemd-repart.socket"
+        "systemd-repart@.service"
       ];
 
       storePaths = [

pkgs/os-specific/linux/systemd/default.nix

@@ -703,6 +703,7 @@ stdenv.mkDerivation (finalAttrs: {
       withMachined
       withNetworkd
       withNspawn
+      withRepart
       withPortabled
       withSysupdate
       withTimedated