From 20328bee63ab9c4ad5505e59744bedc75ef3d036 Mon Sep 17 00:00:00 2001
From: Jared Baur <jaredbaur@fastmail.com>
Date: Thu, 12 Dec 2024 12:37:24 -0800
Subject: [PATCH] flash-tools: add back missing lz4c program

Since https://github.com/lz4/lz4/commit/65998fecaffe7828df7b2bd9c04e9392e9704a0b,
the lz4c symlink no longer exists, but is wanted by `flash.sh`. The
`lz4` program adds a set of legacy cmdline flags when `argv[0]` is
`lz4c` (see https://github.com/lz4/lz4/blob/6cf42afbea04c9ea6a704523aead273715001330/programs/lz4cli.c#L444),
however NVIDIA doesn't use any of these legacy flags in `flash.sh`, they
only require the `lz4c` program to be in PATH.
---
 pkgs/flash-tools/default.nix | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/pkgs/flash-tools/default.nix b/pkgs/flash-tools/default.nix
index 6c84f4e..8a3b14f 100644
--- a/pkgs/flash-tools/default.nix
+++ b/pkgs/flash-tools/default.nix
@@ -29,7 +29,7 @@
 , openssl
 , bspSrc
 , l4tVersion
-,
+, symlinkJoin
 }:
 
 let
@@ -121,13 +121,22 @@ let
       python3
       util-linux
       dosfstools
-      lz4
       bc
       openssl
 
       # Needed by bootloader/tegraflash_impl_t234.py
       gcc
       dtc
+
+      # flash.sh wants lz4c, which used to be a symlink to lz4, but does not
+      # exist in more recent nixpkgs.
+      (symlinkJoin {
+        inherit (lz4) name;
+        paths = [ (lib.getBin lz4) ];
+        postBuild = ''
+          ln -sf $out/bin/lz4{,c}
+        '';
+      })
     ];
   };