more ctf stuff

2025/google/misc-bpfbox/flake.nix

@@ -0,0 +1,51 @@
+{
+  description = "bpfbox";
+
+  inputs = {
+    nixpkgs.url = "nixpkgs/nixos-25.05";
+  };
+
+  outputs = { self, nixpkgs }:
+    let
+      pkgs = import nixpkgs { system = "x86_64-linux"; };
+      lib = pkgs.lib;
+      init = pkgs.buildGoModule {
+        name = "init";
+
+        vendorHash = null;
+
+        src = ./init;
+      };
+      initrdEnv = pkgs.buildEnv {
+        name = "initrd-env";
+        paths = with pkgs; [
+          pkgsStatic.busybox
+          bpftrace
+          init
+        ];
+        pathsToLink = [
+          "/bin"
+        ];
+      };
+      kernel = pkgs.linuxPackages.kernel;
+      initrd = pkgs.makeInitrdNG {
+        name = "initramfs";
+        contents = [
+          { source = "${initrdEnv}/bin"; target = "/bin"; }
+          { source = ./flag.txt; target = "/flag.txt"; }
+          { source = "${initrdEnv}/bin/init"; target = "/init"; }
+        ];
+      };
+    in
+    {
+      packages.x86_64-linux.default = pkgs.stdenvNoCC.mkDerivation {
+        name = "bpfbox";
+        phases = [ "installPhase" ];
+        installPhase = ''
+          mkdir -p $out
+          cp ${initrd}/initrd.gz $out/
+          cp ${kernel}/bzImage $out/
+        '';
+      };
+    };
+}