From 09d4bba25b46328dd038fb842264eca981e00f1a Mon Sep 17 00:00:00 2001
From: Dominic Rubas <1042243+rubas@users.noreply.github.com>
Date: Thu, 24 Sep 2026 22:07:53 +0200
Subject: [PATCH] chore: drop devenv, take the toolchain from the host

rubas/dev is retired. The Taskfile now sets EXMPEG_BUILD=1, and AGENTS.md names the host packages a source build needs, the same way our other NIF libraries do.
---
 .gitignore   |  6 -----
 AGENTS.md    | 10 ++++++--
 README.md    |  3 ++-
 Taskfile.yml |  5 ++++
 devenv.lock  | 65 ----------------------------------------------------
 devenv.nix   | 31 -------------------------
 6 files changed, 15 insertions(+), 105 deletions(-)
 delete mode 100644 devenv.lock
 delete mode 100644 devenv.nix

diff --git a/.gitignore b/.gitignore
index 3439cd6..e3dc140 100644
--- a/.gitignore
+++ b/.gitignore
@@ -23,11 +23,5 @@ test/fixtures/*
 .hex-home/
 .mix-home/
 
-# devenv runtime state (devenv.lock is checked in)
-.dev/
-.devenv/
-.direnv/
-devenv.yaml
-
 # Claude
 .claude/
diff --git a/AGENTS.md b/AGENTS.md
index 756ff65..a62f1f6 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -22,8 +22,14 @@ change to a demux, mux, or codec path. CI runs it on every pull request
 and on every push to `main`.
 
 The first `task compile` builds the NIF from source and takes several
-minutes. devenv sets `EXMPEG_BUILD=1`, so a local build never pulls a
-precompiled artefact.
+minutes. The Taskfile sets `EXMPEG_BUILD=1`, so a local build never pulls
+a precompiled artefact.
+
+The toolchain comes from the host: the Elixir, OTP, and Rust versions in
+`.github/workflows/ci.yml`, plus FFmpeg 9 with its headers, `pkg-config`,
+and libclang for bindgen. On Arch that is `pacman -S ffmpeg clang`. A
+distro with an older FFmpeg builds 9 from source the way
+`.github/actions/setup/action.yml` does.
 
 ## Layout
 
diff --git a/README.md b/README.md
index be524a5..5bc07ed 100644
--- a/README.md
+++ b/README.md
@@ -134,7 +134,8 @@ To build the NIF from source, install Rust 1.98 or newer and set
 - Access to GitHub: the NIF builds on
   [our rsmpeg fork](https://github.com/rubas/rsmpeg) until an rsmpeg
   release on crates.io supports FFmpeg 9, so Cargo fetches it from there.
-- Rust 1.98+ for source builds.
+- Rust 1.98+ for source builds, and libclang for `bindgen`. Set
+  `LIBCLANG_PATH` when libclang is not in a default library path.
 - Elixir 1.17+ / OTP 26+ (the NIF targets Erlang NIF version 2.17).
 
 ## Runtime requirements (precompiled NIF consumers)
diff --git a/Taskfile.yml b/Taskfile.yml
index 84c44d9..0205d5b 100644
--- a/Taskfile.yml
+++ b/Taskfile.yml
@@ -4,6 +4,11 @@ version: "3"
 vars:
   CARGO_MANIFEST: native/exmpeg_native/Cargo.toml
 
+# Local builds compile the NIF from source; only Hex consumers fetch a
+# precompiled artefact.
+env:
+  EXMPEG_BUILD: "1"
+
 tasks:
   setup:
     desc: Install Elixir deps
diff --git a/devenv.lock b/devenv.lock
deleted file mode 100644
index 82fbd1c..0000000
--- a/devenv.lock
+++ /dev/null
@@ -1,65 +0,0 @@
-{
-  "nodes": {
-    "devenv": {
-      "locked": {
-        "dir": "src/modules",
-        "lastModified": 1789991752,
-        "narHash": "sha256-SiH+H00IutELZBg7BBNo6r5DU6E+DG7DjrbeX5+QLa0=",
-        "owner": "cachix",
-        "repo": "devenv",
-        "rev": "1c57b5dea0d400af97053fdd1a536fca17378f73",
-        "type": "github"
-      },
-      "original": {
-        "dir": "src/modules",
-        "owner": "cachix",
-        "repo": "devenv",
-        "type": "github"
-      }
-    },
-    "nixpkgs": {
-      "inputs": {
-        "nixpkgs-src": "nixpkgs-src"
-      },
-      "locked": {
-        "lastModified": 1789506231,
-        "narHash": "sha256-vNkJbtmqyBfFhn/HnzQo4ROuoyYWuy/allqTfJb4kMY=",
-        "owner": "cachix",
-        "repo": "devenv-nixpkgs",
-        "rev": "c2f38fe7f9e04d9aadd354d380f2bd40531d9737",
-        "type": "github"
-      },
-      "original": {
-        "owner": "cachix",
-        "ref": "rolling",
-        "repo": "devenv-nixpkgs",
-        "type": "github"
-      }
-    },
-    "nixpkgs-src": {
-      "flake": false,
-      "locked": {
-        "lastModified": 1789370336,
-        "narHash": "sha256-6RSEDHIWQtesQKWSu5qRai8L2h4KgCgMEfJHstW99G4=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "c7def046b9a883d46974757852106483d741586f",
-        "type": "github"
-      },
-      "original": {
-        "owner": "NixOS",
-        "ref": "nixpkgs-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
-    "root": {
-      "inputs": {
-        "devenv": "devenv",
-        "nixpkgs": "nixpkgs"
-      }
-    }
-  },
-  "root": "root",
-  "version": 7
-}
\ No newline at end of file
diff --git a/devenv.nix b/devenv.nix
deleted file mode 100644
index 64f50e8..0000000
--- a/devenv.nix
+++ /dev/null
@@ -1,31 +0,0 @@
-{ pkgs, lib, ... }:
-{
-  imports = [
-    ../dev/modules/elixir.nix
-    ../dev/modules/rust.nix
-  ];
-
-  # rsmpeg drives bindgen against the system FFmpeg headers. Bindgen
-  # needs libclang plus the libc include path; pkg-config (provided by
-  # the elixir module) locates the FFmpeg .pc files. rsmpeg binds
-  # FFmpeg 9, which is the nixpkgs `ffmpeg`.
-  #
-  # `pkgs.glibc` is undefined on Darwin, so the glibc.dev package and
-  # its BINDGEN env entry are gated to Linux. On Darwin the system SDK
-  # headers cover the same role and bindgen finds them automatically.
-  packages = [
-    pkgs.ffmpeg
-    pkgs.libclang
-  ]
-  ++ lib.optional pkgs.stdenv.isLinux pkgs.glibc.dev;
-
-  env = {
-    LIBCLANG_PATH = "${pkgs.libclang.lib}/lib";
-    # Force a from-source NIF build during development - precompiled
-    # artefacts are only fetched by published-Hex consumers.
-    EXMPEG_BUILD = "1";
-  }
-  // lib.optionalAttrs pkgs.stdenv.isLinux {
-    BINDGEN_EXTRA_CLANG_ARGS = "-I${pkgs.glibc.dev}/include";
-  };
-}