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fix: use cached erlang in devShell (avoid full recompile)

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Drop the headless override — standard beamPackages.erlang (OTP 28.5)
is already in binary cache, so nix develop resolves instantly.
Elixir 1.20.0-rc.4 still built from source (takes ~2min first time).

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
This commit is contained in:
Mikael Hugo 2026-05-11 11:59:04 +02:00
parent 0ed09d5fb5
commit 454e9b83ba
1 changed files with 7 additions and 17 deletions
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18
flake.nix
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@ -20,19 +20,9 @@
let
pkgs = nixpkgs.legacyPackages.${system};
# Erlang OTP 28 without wxwidgets (avoids gstreamer→hotdoc→clang chain)
erlang_28_headless = pkgs.beamPackages.erlang.override {
wxGTK32 = null;
libGL = null;
libGLU = null;
wrapGAppsHook3 = pkgs.buildEnv { name = "empty"; paths = []; };
xorg = { libX11 = null; };
};
# Elixir 1.20.0-rc.4 — not yet in nixpkgs; override elixir_1_19 against headless OTP 28
elixir_1_20_rc4 = (pkgs.beamPackages.elixir_1_19.override {
erlang = erlang_28_headless;
}).overrideAttrs (_old: {
# Elixir 1.20.0-rc.4 — not yet in nixpkgs; override elixir_1_19 against cached OTP 28
# Uses standard erlang (already in binary cache) to avoid full recompile
elixir_1_20_rc4 = pkgs.beamPackages.elixir_1_19.overrideAttrs (_old: {
version = "1.20.0-rc.4";
src = pkgs.fetchFromGitHub {
owner = "elixir-lang";
@ -45,7 +35,7 @@
devShells.default = pkgs.mkShell {
buildInputs = with pkgs; [
elixir_1_20_rc4 # 1.20.0-rc.4 built from source against OTP 28
erlang_28_headless # OTP 28.5, no wx/gui (headless server use)
pkgs.beamPackages.erlang # OTP 28.5 (from binary cache)
nodejs_22 # Phoenix asset pipeline
inotify-tools # LiveReload on Linux
];