From aa1a2e5d75794d53b256d969f99872e88b53a8c5 Mon Sep 17 00:00:00 2001
From: Daniel Barlow <dan@telent.net>
Date: Tue, 4 Apr 2023 22:47:59 +0100
Subject: [PATCH] package gen_init_cpio, tool for making an initramfs

---
 pkgs/default.nix               |  2 ++
 pkgs/gen_init_cpio/default.nix | 17 +++++++++++++++++
 2 files changed, 19 insertions(+)
 create mode 100644 pkgs/gen_init_cpio/default.nix

diff --git a/pkgs/default.nix b/pkgs/default.nix
index 0eaa5b3..2e62701 100644
--- a/pkgs/default.nix
+++ b/pkgs/default.nix
@@ -22,6 +22,8 @@
   netlink-lua = callPackage ./netlink-lua {};
   ifwait = callPackage ./ifwait {};
 
+  gen_init_cpio = callPackage ./gen_init_cpio {};
+
   serviceFns = callPackage ./service-fns {};
 
   # these are packages for the build system not the host/target
diff --git a/pkgs/gen_init_cpio/default.nix b/pkgs/gen_init_cpio/default.nix
new file mode 100644
index 0000000..63440e6
--- /dev/null
+++ b/pkgs/gen_init_cpio/default.nix
@@ -0,0 +1,17 @@
+{
+  stdenv
+, fetchurl
+}:
+stdenv.mkDerivation rec {
+  name = "gen_init_cpio";
+  src = fetchurl {
+    url = "https://raw.githubusercontent.com/torvalds/linux/462cd7724e2341472c9f9670ac88e250788d4c82/usr/gen_init_cpio.c";
+    hash = "sha256-gwKSJGiCS4v98EArNryr/sdYAfDqnGsZ1erfGMNVjpw=";
+  };
+  unpackPhase = "cp ${src} ./gen_init_cpio.c";
+  buildPhase = "gcc -o gen_init_cpio gen_init_cpio.c";
+  installPhase = ''
+    mkdir -p $out/bin
+    cp gen_init_cpio $out/bin
+  '';
+}