From 221ab415ab93edaeb7753b3b7bbc88d7bc6f2b30 Mon Sep 17 00:00:00 2001
From: Sean Miller <smiller@anduril.com>
Date: Mon, 25 Aug 2025 15:28:13 -0700
Subject: [PATCH] Add isp-setup service

---
 modules/default.nix | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/modules/default.nix b/modules/default.nix
index 5f505754..a5478511 100644
--- a/modules/default.nix
+++ b/modules/default.nix
@@ -169,6 +169,16 @@ in
         type = types.bool;
         description = "Enable boot.kernelParams default console configuration";
       };
+
+      ispPkgs = mkOption {
+        type = types.listOf types.package;
+        default = [ ];
+        description = ''
+          The list of packages that contain isp files. This
+          will copy any files in the /nvcam directory to the
+          /var/nvidia/nvcam directory on the device at boot time. 
+        '';
+      };
     };
   };
 
@@ -420,6 +430,35 @@ in
         wantedBy = [ "multi-user.target" ];
       };
 
+      systemd.services.isp-setup =
+        let
+          ispHash = builtins.hashString "sha256" (builtins.concatStringsSep "\x1f" cfg.ispPkgs);
+          copyCmd = builtins.concatStringsSep "\n" (builtins.map (pkg: "${lib.getExe' pkgs.coreutils "cp"} -r ${pkg}/nvcam/. /var/nvidia/nvcam") cfg.ispPkgs);
+          copyISPfiles = pkgs.writeShellScriptBin "copy-isp-files" ''
+            if [[ -f "/var/nvidia/nvcam/.version" ]]; then
+              curVersion=$(cat /var/nvidia/nvcam/.version)
+              if [[ $curVersion == ${ispHash} ]]; then
+                exit 0
+              fi
+              rm -rf /var/nvidia/nvcam
+            fi
+
+            ${lib.getExe' pkgs.coreutils "mkdir"} -p /var/nvidia/nvcam
+            echo ${ispHash} > /var/nvidia/nvcam/.version
+            ${copyCmd}
+            ${lib.getExe' pkgs.coreutils "chmod"} -R 644 /var/nvidia/nvcam
+          '';
+        in
+        mkIf (builtins.length cfg.ispPkgs != 0) {
+          enable = true;
+          description = "Copy ISP files to /var/nvidia/nvcam";
+          serviceConfig = {
+            Type = "oneshot";
+            ExecStart = lib.getExe copyISPfiles;
+          };
+          wantedBy = [ "multi-user.target" ];
+        };
+
       systemd.services.tee-supplicant =
         let
           args = lib.escapeShellArgs (