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Nick Novitski 2023-10-18 16:53:26 -07:00
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.envrc Normal file
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# shellcheck shell=bash
strict_env
if ! has nix_direnv_version || ! nix_direnv_version 2.4.0; then
source_url "https://raw.githubusercontent.com/nix-community/nix-direnv/2.4.0/direnvrc" "sha256-XQzUAvL6pysIJnRJyR7uVpmUSZfc7LSgWQwq/4mBr1U="
fi
nix_direnv_manual_reload
use flake

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on:
pull_request:
push:
branches:
- main
- 'releases/*'
jobs:
test:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v4
- uses: cachix/install-nix-action@v22
- uses: ./
- run: actionlint
- run: shellcheck nix-develop-gha.sh

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.direnv/
result

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LICENSE Normal file
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action.yml Normal file
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name: nix-develop-action
description: Use nix development environments correctly with GitHub Actions
inputs:
arguments:
description: Additional arguments to pass to the `nix develop` command
required: false
runs:
using: "composite"
steps:
- shell: bash
run: ${{ github.action_path }}/nix-develop-gha.sh

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{
"nodes": {
"nixpkgs": {
"locked": {
"lastModified": 1697059129,
"narHash": "sha256-9NJcFF9CEYPvHJ5ckE8kvINvI84SZZ87PvqMbH6pro0=",
"owner": "NixOS",
"repo": "nixpkgs",
"rev": "5e4c2ada4fcd54b99d56d7bd62f384511a7e2593",
"type": "github"
},
"original": {
"owner": "NixOS",
"ref": "nixos-unstable",
"repo": "nixpkgs",
"type": "github"
}
},
"root": {
"inputs": {
"nixpkgs": "nixpkgs"
}
}
},
"root": "root",
"version": 7
}

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{
inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
outputs = {
self,
nixpkgs,
}: let
eachSystem = f:
nixpkgs.lib.genAttrs nixpkgs.lib.platforms.unix (system:
f {
inherit system;
pkgs = nixpkgs.legacyPackages.${system};
});
in {
formatter = eachSystem ({pkgs, ...}: pkgs.alejandra);
devShells = eachSystem ({pkgs, ...}: {
default = pkgs.mkShell {
packages = [pkgs.shellcheck pkgs.actionlint];
};
});
};
}

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#!/usr/bin/env bash
set -euo pipefail
# Read the arguments input into an array, so it can be added to a command line.
IFS=" " read -r -a arguments <<<"${INPUT_ARGUMENTS:-}"
# Add all environment variables except for PATH to GITHUB_ENV.
while IFS='=' read -r -d '' n v; do
if [ "$n" == "PATH" ]; then
continue
fi
if (("$(wc -l <<<"$v")" > 1)); then
delimiter=$(openssl rand -base64 12)
printf "%s<<%s\n%s%s\n" "$n" "$delimiter" "$v" "$delimiter" >>"${GITHUB_ENV:-/dev/stderr}"
continue
fi
printf "%s=%s\n" "$n" "$v" >>"${GITHUB_ENV:-/dev/stderr}"
done < <(nix develop --ignore-environment "${arguments[@]}" --command env -0)
# Read the nix environment's $PATH into an array
IFS=":" read -r -a nix_path_array <<<"$(nix develop "${arguments[@]}" --command bash -c "echo \$PATH")"
# Iterate over the PATH array in reverse
#
# Why in reverse? Appending a directory to $GITHUB_PATH causes that directory
# to be _prepended_ to $PATH in subsequent steps, so if we append in
# first-to-last order, the result will be in last-to-first order. Order in
# PATH elements is significant, since it determines lookup order, thus we
# preserve their order by reversing them before they are reversed again.
for ((i = ${#nix_path_array[@]} - 1; i >= 0; i--)); do
nix_path_entry="${nix_path_array[$i]}"
# Don't add anything that's already present in the $PATH
if echo "$PATH" | grep "$nix_path_entry" --silent; then
continue
fi
echo "$nix_path_entry" >>"${GITHUB_PATH:-/dev/stderr}"
done