phx.new pipeline doesn't work under NixOS for reasons of tailwindcss cannot be downloaded and run #6496
Description
A standard NixOS installation development environment for elixir (using beamMinimal28Packages.elixir_1_19, but also tested with older versions) , does not allow tailwindcss to run when downloaded by mix phx.new --install :
mix phx.new tailwindfail --no-ecto --install
...
$ mix phx.server
Compiling 14 files (.ex)
Generated tailwindfail app
Could not start dynamically linked executable: /home/tbrowne/scratch/teste/tailwindfail/_build/tailwind-linux-x64
NixOS cannot run dynamically linked executables intended for generic
linux environments out of the box. For more information, see:
https://nix.dev/permalink/stub-ld
The fix is quite involved but does work:
https://discourse.nixos.org/t/cannot-run-tailwind-css-with-elixir-phoenix-1-8-project/69651/4
Can this be made smoother somehow? For example a mix option that would automatically configure the project to use system-provided nix packages tailwindcss and watchman?
For completeness, here's my nix develop flake that works with the above fix.
{
description = "A flake for building development environment of Phoenix project.";
inputs = {
nixpkgs.url = "github:NixOS/nixpkgs/master";
flake-utils.url = "github:numtide/flake-utils";
};
outputs = { self, nixpkgs, flake-utils }:
flake-utils.lib.eachDefaultSystem (system:
let
pkgs = nixpkgs.legacyPackages.${system};
in
with pkgs; {
devShells.default = mkShell {
buildInputs = [
beamMinimal28Packages.elixir_1_19
nodejs
tailwindcss_4
watchman
]
++ lib.optionals stdenv.isLinux [
# For ExUnit Notifier on Linux.
libnotify
# For file_system on Linux.
inotify-tools
]
++ lib.optionals stdenv.isDarwin ([
# For ExUnit Notifier on macOS.
terminal-notifier
# For file_system on macOS.
darwin.apple_sdk.frameworks.CoreFoundation
darwin.apple_sdk.frameworks.CoreServices
]);
shellHook = ''
# allows mix to work on the local directory
mkdir -p .nix-mix
mkdir -p .nix-hex
export MIX_HOME=$PWD/.nix-mix
export HEX_HOME=$PWD/.nix-hex
export ERL_LIBS=$HEX_HOME/lib/erlang/lib
# concats PATH
export PATH=$MIX_HOME/bin:$PATH
export PATH=$MIX_HOME/escripts:$PATH
export PATH=$HEX_HOME/bin:$PATH
# enables history for IEx
export ERL_AFLAGS="-kernel shell_history enabled -kernel shell_history_path '\"$PWD/.erlang-history\"'"
# Phoenix add phx.new if not already there
pattern=".nix-mix/archives/phx_new*"
files=$(compgen -G "$pattern")
if [ -z "$files" ]; then
mix archive.install hex phx_new
fi
'';
};
}
);
}