[DDW-1213] Add libsystemd--device-monitor.patch

Author: michalrus

nix/libsystemd--device-monitor.patch

@@ -0,0 +1,17 @@
+diff --git a/src/libsystemd/sd-device/device-monitor.c b/src/libsystemd/sd-device/device-monitor.c
+index fd5900704d..f9106fdbe5 100644
+--- a/src/libsystemd/sd-device/device-monitor.c
++++ b/src/libsystemd/sd-device/device-monitor.c
+@@ -445,9 +445,9 @@ int device_monitor_receive_device(sd_device_monitor *m, sd_device **ret) {
+                                        "sd-device-monitor: No sender credentials received, message ignored.");
+ 
+         cred = (struct ucred*) CMSG_DATA(cmsg);
+-        if (cred->uid != 0)
+-                return log_debug_errno(SYNTHETIC_ERRNO(EAGAIN),
+-                                       "sd-device-monitor: Sender uid="UID_FMT", message ignored.", cred->uid);
++        //if (cred->uid != 0)
++        //        return log_debug_errno(SYNTHETIC_ERRNO(EAGAIN),
++        //                               "sd-device-monitor: Sender uid="UID_FMT", message ignored.", cred->uid);
+ 
+         if (streq(buf.raw, "libudev")) {
+                 /* udev message needs proper version magic */

nix/old-default.nix

@@ -8,7 +8,19 @@ let
   system = {
     x86_64-windows = "x86_64-linux"; # Windows can only be cross-built from Linux now
   }.${target} or target;
-  pkgs = inputs.nixpkgs.legacyPackages.${system};
+  pkgs =
+    if target != "x86_64-linux"
+    then inputs.nixpkgs.legacyPackages.${system}
+    else import inputs.nixpkgs {
+      inherit system;
+      config.packageOverrides = super: {
+        # XXX: non-root users need to be able to use sd-device/device-monitor.c to detect Ledger:
+        # FIXME: find the correct (minimal) place to override this:
+        systemd = super.systemd.overrideAttrs (oldAttrs: {
+          patches = oldAttrs.patches ++ [./libsystemd--device-monitor.patch];
+        });
+      };
+    };
   walletFlake = (import inputs.flake-compat {
     # FIXME: add patches in `flake.nix` after <https://github.com/NixOS/nix/issues/3920>
     src = pkgs.runCommand "cardano-wallet" {} ''