From 35c09df3aeb43eafcd68a6781a019f38b2673493 Mon Sep 17 00:00:00 2001
From: Philip Taron <philip.taron@gmail.com>
Date: Wed, 25 Mar 2026 13:28:43 -0700
Subject: [PATCH 1/2] libvmaf: replace xxd dependency with minimal shell shim

libvmaf uses `xxd --include` to embed model JSON files as C arrays.
This pulled in tinyxxd, causing ~22k rebuilds via libaom -> ffmpeg ->
everything whenever tinyxxd was updated. Replace it with a minimal
`xxd --include` implementation using only stdenv tools (od, sed).

The output is bit-for-bit identical (verified with diffoscope).
---
 pkgs/by-name/li/libvmaf/package.nix |  4 ++--
 pkgs/by-name/li/libvmaf/xxd.nix     | 20 ++++++++++++++++++++
 2 files changed, 22 insertions(+), 2 deletions(-)
 create mode 100644 pkgs/by-name/li/libvmaf/xxd.nix

diff --git a/pkgs/by-name/li/libvmaf/package.nix b/pkgs/by-name/li/libvmaf/package.nix
index 7b841808b423..b3fc10510f58 100644
--- a/pkgs/by-name/li/libvmaf/package.nix
+++ b/pkgs/by-name/li/libvmaf/package.nix
@@ -1,5 +1,6 @@
 {
   lib,
+  buildPackages,
   stdenv,
   fetchFromGitHub,
   ffmpeg-full,
@@ -8,7 +9,6 @@
   nasm,
   ninja,
   testers,
-  xxd,
 }:
 
 stdenv.mkDerivation (finalAttrs: {
@@ -28,7 +28,7 @@ stdenv.mkDerivation (finalAttrs: {
     meson
     ninja
     nasm
-    xxd
+    (buildPackages.callPackage ./xxd.nix { })
   ];
 
   postPatch = lib.optionalString stdenv.hostPlatform.isFreeBSD ''
diff --git a/pkgs/by-name/li/libvmaf/xxd.nix b/pkgs/by-name/li/libvmaf/xxd.nix
new file mode 100644
index 000000000000..d33517f3a042
--- /dev/null
+++ b/pkgs/by-name/li/libvmaf/xxd.nix
@@ -0,0 +1,20 @@
+# Minimal `xxd --include` replacement for embedding binary files as C arrays.
+# Used instead of tinyxxd to avoid ~22k rebuilds via libaom -> ffmpeg -> everything.
+{ writeShellScriptBin }:
+
+writeShellScriptBin "xxd" ''
+  if [ "$1" != "--include" ]; then
+    echo "xxd: only --include mode is supported" >&2
+    exit 1
+  fi
+  input="$2"
+  output="$3"
+  # Match real xxd behavior: derive variable name from the full path
+  varname=$(echo "$input" | sed 's/[^a-zA-Z0-9_]/_/g')
+  {
+    printf 'unsigned char %s[] = {\n' "$varname"
+    od -An -tx1 -v "$input" | sed 's/  */ /g; s/^ //; s/ $//; s/ /, 0x/g; s/^/  0x/; s/$/,/'
+    printf '};\n'
+    printf 'unsigned int %s_len = %d;\n' "$varname" "$(wc -c < "$input")"
+  } > "$output"
+''

From 2159366cfd2ab5901a6c8ef0674afe35e9232be0 Mon Sep 17 00:00:00 2001
From: Philip Taron <philip.taron@gmail.com>
Date: Wed, 25 Mar 2026 13:28:50 -0700
Subject: [PATCH 2/2] tinyxxd: 1.3.11 -> 1.3.14

https://github.com/xyproto/tinyxxd/releases/tag/v1.3.14
---
 pkgs/by-name/ti/tinyxxd/package.nix | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/pkgs/by-name/ti/tinyxxd/package.nix b/pkgs/by-name/ti/tinyxxd/package.nix
index 9035ae112dcf..afac5a7d510c 100644
--- a/pkgs/by-name/ti/tinyxxd/package.nix
+++ b/pkgs/by-name/ti/tinyxxd/package.nix
@@ -8,13 +8,13 @@
 
 stdenv.mkDerivation (finalAttrs: {
   pname = "tinyxxd";
-  version = "1.3.11";
+  version = "1.3.14";
 
   src = fetchFromGitHub {
     repo = "tinyxxd";
     owner = "xyproto";
     rev = "v${finalAttrs.version}";
-    hash = "sha256-zM0KRQggDc45eeeZZ6nAI/5sm7NtF1XGucIJV4O1AJs=";
+    hash = "sha256-iN7i5XtGfvtRX8MA2IWiPsS2PYkmKTrztfvgLtoIq2o=";
   };
 
   nativeBuildInputs = [ installShellFiles ];