Merge pull request #236 from Mic92/nix-2.28.3

Fixes #229.

.editorconfig

@@ -0,0 +1,15 @@
+# EditorConfig is awesome: https://EditorConfig.org
+
+# top-most EditorConfig file
+root = true
+
+# Unix-style newlines with a newline ending every file
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 2
+indent_style = space
+insert_final_newline = true
+
+[LICENSE]
+indent_size = unset

.github/workflows/test.yml

@@ -5,20 +5,27 @@ on:
     branches:
       - master
 
+env:
+  nixpkgs_channel: nixpkgs=channel:nixos-24.11
+  oldest_supported_installer: nix-2.8.0
+
 jobs:
   simple-build:
     strategy:
+      fail-fast: false
       matrix:
-        os: [ubuntu-latest, macos-latest]
+        os:
+        - ubuntu-latest
+        - ubuntu-24.04-arm
+        - macos-latest
+        - macos-13
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v2.3.4
-    - run: yarn install --frozen-lockfile
-    - run: yarn build
+    - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
     - name: Install Nix
       uses: ./
       with:
-        nix_path: nixpkgs=channel:nixos-20.03
+        nix_path: ${{ env.nixpkgs_channel }}
     - run: nix-env -iA cachix -f https://cachix.org/api/v1/install
     - run: cat /etc/nix/nix.conf
     # cachix should be available and be able to configure a cache
@@ -27,33 +34,39 @@ jobs:
 
   custom-nix-path:
     strategy:
+      fail-fast: false
       matrix:
-        os: [ubuntu-latest, macos-latest]
+        os:
+        - ubuntu-latest
+        - ubuntu-24.04-arm
+        - macos-latest
+        - macos-13
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v2.3.4
-    - run: yarn install --frozen-lockfile
-    - run: yarn build
+    - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
     - name: Install Nix
       uses: ./
       with:
-        nix_path: nixpkgs=channel:nixos-20.03
-    - run: test $NIX_PATH == "nixpkgs=channel:nixos-20.03"
+        nix_path: ${{ env.nixpkgs_channel }}
+    - run: test $NIX_PATH == '${{ env.nixpkgs_channel }}'
     - run: nix-build test.nix
 
   extra-nix-config:
     strategy:
+      fail-fast: false
       matrix:
-        os: [ubuntu-latest, macos-latest]
+        os:
+        - ubuntu-latest
+        - ubuntu-24.04-arm
+        - macos-latest
+        - macos-13
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v2.3.4
-    - run: yarn install --frozen-lockfile
-    - run: yarn build
+    - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
     - name: Install Nix
       uses: ./
       with:
-        nix_path: nixpkgs=channel:nixos-20.03
+        nix_path: ${{ env.nixpkgs_channel }}
         extra_nix_config: |
           sandbox = relaxed
     - run: cat /etc/nix/nix.conf
@@ -61,36 +74,79 @@ jobs:
 
   flakes:
     strategy:
+      fail-fast: false
       matrix:
-        os: [ubuntu-latest, macos-latest]
+        os:
+        - ubuntu-latest
+        - ubuntu-24.04-arm
+        - macos-latest
+        - macos-13
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v2.3.4
-    - run: yarn install --frozen-lockfile
-    - run: yarn build
+    - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
     - name: Install Nix
       uses: ./
-      with:
-        install_url: https://nixos-nix-install-tests.cachix.org/serve/i6laym9jw3wg9mw6ncyrk6gjx4l34vvx/install
-        install_options: '--tarball-url-prefix https://nixos-nix-install-tests.cachix.org/serve'
-        extra_nix_config: |
-          experimental-features = nix-command flakes
-          access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
     - run: nix flake show github:NixOS/nixpkgs
 
-  installer-options:
+  latest-installer:
     strategy:
+      fail-fast: false
       matrix:
-        os: [ubuntu-latest, macos-latest]
+        include:
+          - os: ubuntu-latest
+            system: x86_64-linux
+          - os: ubuntu-24.04-arm
+            system: aarch64-linux
+          - os: macos-latest
+            system: aarch64-darwin
+          - os: macos-13
+            system: x86_64-darwin
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v2
-    - run: yarn install --frozen-lockfile
-    - run: yarn build
+    - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+    - name: Run NAR server
+      run: |
+        curl --location https://github.com/cachix/nar-toolbox/releases/download/v0.1.0/nar-toolbox-${{ matrix.system }} -O
+        chmod +x ./nar-toolbox-${{ matrix.system }}
+        ./nar-toolbox-${{ matrix.system }} serve https://cache.nixos.org &
     - name: Install Nix
       uses: ./
       with:
-        nix_path: nixpkgs=channel:nixos-21.05
-        install_url: https://nixos-nix-install-tests.cachix.org/serve/i6laym9jw3wg9mw6ncyrk6gjx4l34vvx/install
-        install_options: '--tarball-url-prefix https://nixos-nix-install-tests.cachix.org/serve'
+        nix_path: ${{ env.nixpkgs_channel }}
+        install_url: https://hydra.nixos.org/job/nix/master/installerScript/latest-finished/download/1/install
+        install_options: "--tarball-url-prefix http://localhost:8080"
     - run: nix-build test.nix
+
+  oldest-supported-installer:
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+        - ubuntu-latest
+        - ubuntu-24.04-arm
+        - macos-latest
+        - macos-13
+    runs-on: ${{ matrix.os }}
+    steps:
+    - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+    - name: Install Nix
+      uses: ./
+      with:
+        nix_path: ${{ env.nixpkgs_channel }}
+        install_url: https://releases.nixos.org/nix/${{ env.oldest_supported_installer }}/install
+    - run: nix-build test.nix
+
+  act-support:
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+    - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+    - run: curl https://raw.githubusercontent.com/nektos/act/master/install.sh | sudo bash
+    - run: docker pull ghcr.io/catthehacker/ubuntu:js-24.04
+    - run: |
+        ./bin/act push \
+          -P ubuntu-latest=ghcr.io/catthehacker/ubuntu:js-24.04 \
+          -j simple-build \
+          --matrix os:ubuntu-latest

.gitignore

@@ -1,93 +1,2 @@
-__tests__/runner/*
-
-# comment out in distribution branches
-node_modules/
-
-# Rest pulled from https://github.com/github/gitignore/blob/master/Node.gitignore
-# Logs
-logs
-*.log
-npm-debug.log*
-yarn-debug.log*
-yarn-error.log*
-lerna-debug.log*
-
-# Diagnostic reports (https://nodejs.org/api/report.html)
-report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
-
-# Runtime data
-pids
-*.pid
-*.seed
-*.pid.lock
-
-# Directory for instrumented libs generated by jscoverage/JSCover
-lib-cov
-
-# Coverage directory used by tools like istanbul
-coverage
-*.lcov
-
-# nyc test coverage
-.nyc_output
-
-# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
-.grunt
-
-# Bower dependency directory (https://bower.io/)
-bower_components
-
-# node-waf configuration
-.lock-wscript
-
-# Compiled binary addons (https://nodejs.org/api/addons.html)
-build/Release
-
-# Dependency directories
-jspm_packages/
-
-# TypeScript v1 declaration files
-typings/
-
-# TypeScript cache
-*.tsbuildinfo
-
-# Optional npm cache directory
-.npm
-
-# Optional eslint cache
-.eslintcache
-
-# Optional REPL history
-.node_repl_history
-
-# Output of 'npm pack'
-*.tgz
-
-# Yarn Integrity file
-.yarn-integrity
-
 # dotenv environment variables file
-.env
-.env.test
-
-# parcel-bundler cache (https://parceljs.org/)
-.cache
-
-# next.js build output
-.next
-
-# nuxt.js build output
-.nuxt
-
-# vuepress build output
-.vuepress/dist
-
-# Serverless directories
-.serverless/
-
-# FuseBox cache
-.fusebox/
-
-# DynamoDB Local files
-.dynamodb/
+.env*

README.md

@@ -1,23 +1,24 @@
 # install-nix-action
 
-![github actions badge](https://github.com/cachix/install-nix-action/workflows/install-nix-action%20test/badge.svg)
+![GitHub Actions badge](https://github.com/cachix/install-nix-action/workflows/install-nix-action%20test/badge.svg)
 
 Installs [Nix](https://nixos.org/nix/) on GitHub Actions for the supported platforms: Linux and macOS.
 
 By default it has no nixpkgs configured, you have to set `nix_path`
 by [picking a channel](https://status.nixos.org/)
-or [pin nixpkgs yourself](https://nix.dev/reference/pinning-nixpkgs.html) 
-(see also [pinning tutorial](https://nix.dev/tutorials/towards-reproducibility-pinning-nixpkgs.html)).
+or [pin nixpkgs yourself](https://nix.dev/reference/pinning-nixpkgs)
+(see also [pinning tutorial](https://nix.dev/tutorials/towards-reproducibility-pinning-nixpkgs)).
 
 # Features
 
 - Quick installation (~4s on Linux, ~20s on macOS)
 - Multi-User installation (with sandboxing enabled only on Linux)
-- [Self-hosted github runner](https://docs.github.com/en/actions/hosting-your-own-runners/about-self-hosted-runners) support
-- Allows specifying Nix installation URL via `install_url`
-- Allows specifying extra Nix configration options via `extra_nix_config`
+- [Self-hosted GitHub runner](https://docs.github.com/en/actions/hosting-your-own-runners/about-self-hosted-runners) support
+- Allows specifying Nix installation URL via `install_url` (the oldest supported Nix version is 2.3.5)
+- Allows specifying extra Nix configuration options via `extra_nix_config`
 - Allows specifying `$NIX_PATH` and channels via `nix_path`
 - Share `/nix/store` between builds using [cachix-action](https://github.com/cachix/cachix-action) for simple binary cache setup to speed up your builds and share binaries with your team
+- Enables KVM on supported machines: run VMs and NixOS tests with full hardware-acceleration
 
 ## Usage
 
@@ -32,14 +33,13 @@ jobs:
   tests:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2.3.4
-    - uses: cachix/install-nix-action@v13
+    - uses: actions/checkout@v4
+    - uses: cachix/install-nix-action@v31
       with:
         nix_path: nixpkgs=channel:nixos-unstable
     - run: nix-build
 ```
 
-
 ## Usage with Flakes
 
 ```yaml
@@ -51,14 +51,10 @@ jobs:
   tests:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2.3.4
-    - uses: cachix/install-nix-action@v13
+    - uses: actions/checkout@v4
+    - uses: cachix/install-nix-action@v31
       with:
-        install_url: https://nixos-nix-install-tests.cachix.org/serve/i6laym9jw3wg9mw6ncyrk6gjx4l34vvx/install
-        install_options: '--tarball-url-prefix https://nixos-nix-install-tests.cachix.org/serve'
-        extra_nix_config: |
-          experimental-features = nix-command flakes
-          access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
+        github_access_token: ${{ secrets.GITHUB_TOKEN }}
     - run: nix build
     - run: nix flake check
 ```
@@ -67,11 +63,44 @@ To install Nix from any commit, go to [the corresponding installer_test action](
 
 ## Inputs (specify using `with:`)
 
-- `install_url`: specify URL to install Nix from (useful for testing non-stable releases or pinning Nix for example https://releases.nixos.org/nix/nix-2.3.7/install)
+- `extra_nix_config`: append to `/etc/nix/nix.conf`
+
+- `github_access_token`: configure Nix to pull from GitHub using the given GitHub token. This helps work around rate limit issues. Has no effect when `access-tokens` is also specified in `extra_nix_config`.
+
+- `install_url`: specify URL to install Nix from (useful for testing non-stable releases or pinning Nix, for example https://releases.nixos.org/nix/nix-2.3.7/install)
+
+- `install_options`: additional installer flags passed to the installer script.
 
 - `nix_path`: set `NIX_PATH` environment variable, for example `nixpkgs=channel:nixos-unstable`
 
-- `extra_nix_config`: append to `/etc/nix/nix.conf`
+- `enable_kvm`: whether to enable KVM for hardware-accelerated virtualization on Linux. Enabled by default if available.
+
+- `set_as_trusted_user`: whether to add the current user to `trusted-users`. Enabled by default.
+
+
+## Differences from the default Nix installer
+
+Some settings have been optimised for use in CI environments:
+
+- `nix.conf` settings. Override these defaults with `extra_nix_config`:
+
+  - The experimental `flakes` and `nix-command` features are enabled. Disable by overriding `experimental-features` in `extra_nix_config`.
+
+  - `max-jobs` is set to `auto`.
+
+  - `show-trace` is set to `true`.
+
+  - `$USER` is added to `trusted-users`.
+
+  - `$GITHUB_TOKEN` is added to `access_tokens` if no other `github_access_token` is provided.
+
+  - `always-allow-substitutes` is set to `true`.
+
+  - `ssl-cert-file` is set to `/etc/ssl/cert.pem` on macOS.
+
+- KVM is enabled on Linux if available. Disable by setting `enable_kvm: false`.
+
+- `$TMPDIR` is set to `$RUNNER_TEMP` if empty.
 
 ---
 
@@ -79,25 +108,23 @@ To install Nix from any commit, go to [the corresponding installer_test action](
 
 ### How do I print nixpkgs version I have configured?
 
-
 ```yaml
 - name: Print nixpkgs version
   run: nix-instantiate --eval -E '(import <nixpkgs> {}).lib.version'
 ```
 
-### How can I run NixOS tests?
+### How do I run NixOS tests?
 
 With the following inputs:
 
 ```yaml
 - uses: cachix/install-nix-action@vXX
   with:
+    enable_kvm: true
     extra_nix_config: "system-features = nixos-test benchmark big-parallel kvm"
 ```
 
-[Note that there's no hardware acceleration on GitHub Actions.](https://github.com/actions/virtual-environments/issues/183#issuecomment-610723516).
-
-### How can I install packages via nix-env from the specified `nix_path`?
+### How do I install packages via nix-env from the specified `nix_path`?
 
 ```
 nix-env -i mypackage -f '<nixpkgs>'
@@ -121,26 +148,85 @@ Otherwise, you can add any binary cache to nix.conf using
 install-nix-action's own `extra_nix_config` input:
 
 ```yaml
-- uses: cachix/install-nix-action@vXX
+- uses: cachix/install-nix-action@v31
   with:
     extra_nix_config: |
       trusted-public-keys = hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ= cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=
       substituters = https://hydra.iohk.io https://cache.nixos.org/
 ```
 
-## Hacking
+### How do I pass environment variables to commands run with `nix develop` or `nix shell`?
 
-Install the dependencies
-```bash
-$ yarn install
+Nix runs commands in a restricted environment by default, called `pure mode`.
+In pure mode, environment variables are not passed through to improve the reproducibility of the shell.
+
+You can use the `--keep / -k` flag to keep certain environment variables:
+
+```yaml
+- name: Run a command with nix develop
+  run: nix develop --ignore-environment --keep MY_ENV_VAR --command echo $MY_ENV_VAR
+  env:
+    MY_ENV_VAR: "hello world"
 ```
 
-Build the typescript
-```bash
-$ yarn build
+Or you can disable pure mode entirely with the `--impure` flag:
+
+```
+nix develop --impure
 ```
 
-Run the tests :heavy_check_mark:
-```bash
-$ yarn test
+### How do I pass AWS credentials to the Nix daemon?
+
+In multi-user mode, Nix commands that operate on the Nix store are forwarded to a privileged daemon. This daemon runs in a separate context from your GitHub Actions workflow and cannot access the workflow's environment variables. Consequently, any secrets or credentials defined in your workflow environment will not be available to Nix operations that require store access.
+
+There are two ways to pass AWS credentials to the Nix daemon:
+  - Configure a default profile using the AWS CLI
+  - Install Nix in single-user mode
+
+#### Configure a default profile using the AWS CLI
+
+The Nix daemon supports reading AWS credentials from the `~/.aws/credentials` file.
+
+We can use the AWS CLI to configure a default profile using short-lived credentials fetched using OIDC:
+
+```yaml
+job:
+  build:
+    runs-on: ubuntu-latest
+    # Required permissions to request AWS credentials
+    permissions:
+      id-token: write
+      contents: read
+    steps:
+      - uses: actions/checkout@v4
+      - uses: cachix/install-nix-action@v31
+      - name: Assume AWS Role
+        uses: aws-actions/configure-aws-credentials@v4.1.0
+        with:
+          aws-region: us-east-1
+          role-to-assume: arn:aws-cn:iam::123456789100:role/my-github-actions-role
+      - name: Make AWS Credentials accessible to nix-daemon
+        run: |
+          sudo -i aws configure set aws_access_key_id "${AWS_ACCESS_KEY_ID}"
+          sudo -i aws configure set aws_secret_access_key "${AWS_SECRET_ACCESS_KEY}"
+          sudo -i aws configure set aws_session_token "${AWS_SESSION_TOKEN}"
+          sudo -i aws configure set region "${AWS_REGION}"
+```
+
+#### Install Nix in single-user mode
+
+In some environments it may be possible to install Nix in single-user mode by passing the `--no-daemon` flag to the installer.
+This mode is normally used on platforms without an init system, like systemd, and in containerized environments with a single user that can own the entire Nix store.
+
+This approach is more generic as it allows passing environment variables directly to Nix, including secrets, proxy settings, and other configuration options.
+
+However, it may not be suitable for all environments. [Consult the Nix manual](https://nix.dev/manual/nix/latest/installation/nix-security) for the latest restrictions and differences between the two modes.
+
+For example, single-user mode is currently supported on hosted Linux GitHub runners, like `ubuntu-latest`.
+It is not supported on macOS runners, like `macos-latest`.
+
+```yaml
+- uses: cachix/install-nix-action@v31
+  with:
+    install_options: --no-daemon
 ```

RELEASE.md

@@ -0,0 +1,44 @@
+# Release
+
+As of v31, releases of this action follow Semantic Versioning.
+
+### Publishing a new release
+
+#### Publish the release
+
+Draft [a new release on GitHub](https://github.com/cachix/install-nix-action/releases):
+
+- In `Choose a tag`, create a new tag, like `v31.2.1`, following semver.
+- Click `Generate release notes`.
+- `Set as the latest release` should be selected automatically.
+- Publish release
+
+#### Update the major tag
+
+The major tag, like `v31`, allows downstream users to opt-in to automatic non-breaking updates.
+
+This process follows GitHub's own guidelines:
+https://github.com/actions/toolkit/blob/main/docs/action-versioning.md
+
+##### Fetch the latest tags
+
+```
+git pull --tags --force
+```
+
+##### Move the tag
+
+```
+git tag -fa v31
+```
+```
+git push origin v31 --force
+```
+
+#### Update the release notes for the major tag
+
+Find the release on GitHub: https://github.com/cachix/install-nix-action/releases
+
+Edit the release and click `Generate release notes`.
+Edit the formatting and publish.
+

__tests__/main.test.ts

@@ -1,4 +0,0 @@
-test('nothing', async() => {
-});
-
-// TODO: hopefully github actions will support integration tests

action.yml

@@ -2,17 +2,38 @@ name: 'Install Nix'
 description: 'Installs Nix on GitHub Actions for the supported platforms: Linux and macOS.'
 author: 'Domen Kožar'
 inputs:
+  extra_nix_config:
+    description: 'Gets appended to `/etc/nix/nix.conf` if passed.'
+  github_access_token:
+    description: 'Configure Nix to pull from GitHub using the given GitHub token.'
   install_url:
     description: 'Installation URL that will contain a script to install Nix.'
   install_options:
     description: 'Additional installer flags passed to the installer script.'
   nix_path:
     description: 'Set NIX_PATH environment variable.'
-  extra_nix_config:
-    description: 'gets appended to `/etc/nix/nix.conf` if passed.'
+  enable_kvm:
+    description: 'Enable KVM for hardware-accelerated virtualization on Linux, if available.'
+    required: false
+    default: true
+  set_as_trusted_user:
+    description: 'Add current user to `trusted-users`.'
+    required: false
+    default: true
 branding:
   color: 'blue'
   icon: 'sun'
 runs:
-  using: 'node12'
-  main: 'lib/main.js'
+  using: 'composite'
+  steps:
+    - run : ${GITHUB_ACTION_PATH}/install-nix.sh
+      shell: bash
+      env:
+        INPUT_EXTRA_NIX_CONFIG: ${{ inputs.extra_nix_config }}
+        INPUT_GITHUB_ACCESS_TOKEN: ${{ inputs.github_access_token }}
+        INPUT_INSTALL_OPTIONS: ${{ inputs.install_options }}
+        INPUT_INSTALL_URL: ${{ inputs.install_url }}
+        INPUT_NIX_PATH: ${{ inputs.nix_path }}
+        INPUT_ENABLE_KVM: ${{ inputs.enable_kvm }}
+        INPUT_SET_AS_TRUSTED_USER: ${{ inputs.set_as_trusted_user }}
+        GITHUB_TOKEN: ${{ github.token }}

install-nix.sh

@@ -0,0 +1,124 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+if nix_path="$(type -p nix)" ; then
+  echo "Aborting: Nix is already installed at ${nix_path}"
+  exit
+fi
+
+if [[ ($OSTYPE =~ linux) && ($INPUT_ENABLE_KVM == 'true') ]]; then
+  enable_kvm() {
+    echo 'KERNEL=="kvm", GROUP="kvm", MODE="0666", OPTIONS+="static_node=kvm"' | sudo tee /etc/udev/rules.d/99-install-nix-action-kvm.rules
+    sudo udevadm control --reload-rules && sudo udevadm trigger --name-match=kvm
+  }
+
+  echo '::group::Enabling KVM support'
+  enable_kvm && echo 'Enabled KVM' || echo 'KVM is not available'
+  echo '::endgroup::'
+fi
+
+# GitHub command to put the following log messages into a group which is collapsed by default
+echo "::group::Installing Nix"
+
+# Create a temporary workdir
+workdir=$(mktemp -d)
+trap 'rm -rf "$workdir"' EXIT
+
+# Configure Nix
+add_config() {
+  echo "$1" >> "$workdir/nix.conf"
+}
+add_config "show-trace = true"
+# Set jobs to number of cores
+add_config "max-jobs = auto"
+if [[ $OSTYPE =~ darwin ]]; then
+  add_config "ssl-cert-file = /etc/ssl/cert.pem"
+fi
+# Allow binary caches specified at user level
+if [[ $INPUT_SET_AS_TRUSTED_USER == 'true' ]]; then
+  add_config "trusted-users = root ${USER:-}"
+fi
+# Add a GitHub access token.
+# Token-less access is subject to lower rate limits.
+if [[ -n "${INPUT_GITHUB_ACCESS_TOKEN:-}" ]]; then
+  echo "::debug::Using the provided github_access_token for github.com"
+  add_config "access-tokens = github.com=$INPUT_GITHUB_ACCESS_TOKEN"
+# Use the default GitHub token if available.
+# Skip this step if running an Enterprise instance. The default token there does not work for github.com.
+elif [[ -n "${GITHUB_TOKEN:-}" && $GITHUB_SERVER_URL == "https://github.com" ]]; then
+  echo "::debug::Using the default GITHUB_TOKEN for github.com"
+  add_config "access-tokens = github.com=$GITHUB_TOKEN"
+else
+  echo "::debug::Continuing without a GitHub access token"
+fi
+# Append extra nix configuration if provided
+if [[ -n "${INPUT_EXTRA_NIX_CONFIG:-}" ]]; then
+  add_config "$INPUT_EXTRA_NIX_CONFIG"
+fi
+if [[ ! $INPUT_EXTRA_NIX_CONFIG =~ "experimental-features" ]]; then
+  add_config "experimental-features = nix-command flakes"
+fi
+# Always allow substituting from the cache, even if the derivation has `allowSubstitutes = false`.
+# This is a CI optimisation to avoid having to download the inputs for already-cached derivations to rebuild trivial text files.
+if [[ ! $INPUT_EXTRA_NIX_CONFIG =~ "always-allow-substitutes" ]]; then
+  add_config "always-allow-substitutes = true"
+fi
+
+# Nix installer flags
+installer_options=(
+  --no-channel-add
+  --nix-extra-conf-file "$workdir/nix.conf"
+)
+
+# only use the nix-daemon settings if on darwin (which get ignored) or systemd is supported
+if [[ (! $INPUT_INSTALL_OPTIONS =~ "--no-daemon") && ($OSTYPE =~ darwin || -e /run/systemd/system) ]]; then
+  installer_options+=(
+    --daemon
+    --daemon-user-count "$(python3 -c 'import multiprocessing as mp; print(mp.cpu_count() * 2)')"
+  )
+else
+  # "fix" the following error when running nix*
+  # error: the group 'nixbld' specified in 'build-users-group' does not exist
+  add_config "build-users-group ="
+  sudo mkdir -p /etc/nix
+  sudo chmod 0755 /etc/nix
+  sudo cp "$workdir/nix.conf" /etc/nix/nix.conf
+fi
+
+if [[ -n "${INPUT_INSTALL_OPTIONS:-}" ]]; then
+  IFS=' ' read -r -a extra_installer_options <<< "$INPUT_INSTALL_OPTIONS"
+  installer_options=("${extra_installer_options[@]}" "${installer_options[@]}")
+fi
+
+echo "installer options: ${installer_options[*]}"
+
+# There is --retry-on-errors, but only newer curl versions support that
+curl_retries=5
+while ! curl -sS -o "$workdir/install" -v --fail -L "${INPUT_INSTALL_URL:-https://releases.nixos.org/nix/nix-2.28.3/install}"
+do
+  sleep 1
+  ((curl_retries--))
+  if [[ $curl_retries -le 0 ]]; then
+    echo "curl retries failed" >&2
+    exit 1
+  fi
+done
+
+sh "$workdir/install" "${installer_options[@]}"
+
+# Set paths
+echo "/nix/var/nix/profiles/default/bin" >> "$GITHUB_PATH"
+# new path for nix 2.14
+echo "$HOME/.nix-profile/bin" >> "$GITHUB_PATH"
+
+if [[ -n "${INPUT_NIX_PATH:-}" ]]; then
+  echo "NIX_PATH=${INPUT_NIX_PATH}" >> "$GITHUB_ENV"
+fi
+
+# Set temporary directory (if not already set) to fix https://github.com/cachix/install-nix-action/issues/197
+if [[ -z "${TMPDIR:-}" ]]; then
+  echo "TMPDIR=${RUNNER_TEMP}" >> "$GITHUB_ENV"
+fi
+
+# Close the log message group which was opened above
+echo "::endgroup::"

jest.config.js

@@ -1,11 +0,0 @@
-module.exports = {
-  clearMocks: true,
-  moduleFileExtensions: ['js', 'ts'],
-  testEnvironment: 'node',
-  testMatch: ['**/*.test.ts'],
-  testRunner: 'jest-circus/runner',
-  transform: {
-    '^.+\\.ts$': 'ts-jest'
-  },
-  verbose: true
-}

lib/README.md

@@ -1,5 +0,0 @@
-
-# Generated Code
-
-The files in this directory are generated.
-See [src](../src)

lib/install-nix.sh

@@ -1,67 +0,0 @@
-#!/usr/bin/env bash
-set -euo pipefail
-
-if type -p nix &>/dev/null ; then
-  echo "Aborting: Nix is already installed at $(type -p nix)"
-  exit
-fi
-
-# Configure Nix
-add_config() {
-  echo "$1" | tee -a /tmp/nix.conf >/dev/null
-}
-# Set jobs to number of cores
-add_config "max-jobs = auto"
-# Allow binary caches for user
-add_config "trusted-users = root $USER"
-# Append extra nix configuration if provided
-if [[ $INPUT_EXTRA_NIX_CONFIG != "" ]]; then
-  add_config "$INPUT_EXTRA_NIX_CONFIG"
-fi
-
-# Nix installer flags
-installer_options=(
-  --no-channel-add
-  --darwin-use-unencrypted-nix-store-volume
-  --nix-extra-conf-file /tmp/nix.conf
-)
-
-# only use the nix-daemon settings if on darwin (which get ignored) or systemd is supported
-if [[ $OSTYPE =~ darwin || -e /run/systemd/system ]]; then
-  installer_options+=(
-    --daemon
-    --daemon-user-count `python -c 'import multiprocessing as mp; print(mp.cpu_count() * 2)'`
-  )
-else
-  # "fix" the following error when running nix*
-  # error: the group 'nixbld' specified in 'build-users-group' does not exist
-  mkdir -m 0755 /etc/nix
-  echo "build-users-group =" > /etc/nix/nix.conf
-fi
-
-if [[ $INPUT_INSTALL_OPTIONS != "" ]]; then
-  IFS=' ' read -r -a extra_installer_options <<< $INPUT_INSTALL_OPTIONS
-  installer_options=("${extra_installer_options[@]}" "${installer_options[@]}")
-fi
-
-echo "installer options: ${installer_options[@]}"
-sh <(curl --retry 5 --retry-connrefused -L "${INPUT_INSTALL_URL:-https://nixos.org/nix/install}") "${installer_options[@]}"
-
-if [[ $OSTYPE =~ darwin ]]; then
-  # Disable spotlight indexing of /nix to speed up performance
-  sudo mdutil -i off /nix
-
-  # macOS needs certificates hints
-  cert_file=/nix/var/nix/profiles/default/etc/ssl/certs/ca-bundle.crt
-  echo "NIX_SSL_CERT_FILE=$cert_file" >> "$GITHUB_ENV"
-  export NIX_SSL_CERT_FILE=$cert_file
-  sudo launchctl setenv NIX_SSL_CERT_FILE "$cert_file"
-fi
-
-# Set paths
-echo "/nix/var/nix/profiles/per-user/$USER/profile/bin" >> "$GITHUB_PATH"
-echo "/nix/var/nix/profiles/default/bin" >> "$GITHUB_PATH"
-
-if [[ $INPUT_NIX_PATH != "" ]]; then
-  echo "NIX_PATH=${INPUT_NIX_PATH}" >> "$GITHUB_ENV"
-fi

lib/main.js

@@ -1,4 +0,0 @@
-"use strict";
-Object.defineProperty(exports, "__esModule", { value: true });
-const child_process_1 = require("child_process");
-child_process_1.execFileSync(`${__dirname}/install-nix.sh`, { stdio: 'inherit' });

package.json

@@ -1,36 +0,0 @@
-{
-  "name": "install-nix-action",
-  "version": "1.0.0",
-  "private": true,
-  "description": "Installs Nix on GitHub Actions for the supported platforms: Linux and macOS.",
-  "main": "lib/main.js",
-  "scripts": {
-    "build": "tsc",
-    "test": "jest"
-  },
-  "repository": {
-    "type": "git",
-    "url": "git+https://github.com/cachix/install-nix-action.git"
-  },
-  "keywords": [
-    "actions",
-    "node",
-    "setup"
-  ],
-  "author": "Domen Kožar",
-  "license": "ASL2",
-  "dependencies": {
-    "@actions/core": "^1.2.6",
-    "@actions/exec": "^1.0.1",
-    "@actions/tool-cache": "^1.1.2"
-  },
-  "devDependencies": {
-    "ts-node": "^8.4.1",
-    "@types/jest": "^24.0.13",
-    "@types/node": "^12.0.4",
-    "jest": "^24.8.0",
-    "jest-circus": "^24.7.1",
-    "ts-jest": "^24.0.2",
-    "typescript": "^3.5.1"
-  }
-}

shell.nix

@@ -1,8 +0,0 @@
-{ pkgs ? import <nixpkgs> {}
-}:
-
-pkgs.mkShell {
-  name = "install-nix-action-shell";
-
-  buildInputs = [ pkgs.yarn ];
-}

src/main.ts

@@ -1,3 +0,0 @@
-import { execFileSync } from 'child_process';
-
-execFileSync(`${__dirname}/install-nix.sh`, { stdio: 'inherit' });

tsconfig.json

@@ -1,63 +0,0 @@
-{
-  "compilerOptions": {
-    /* Basic Options */
-    // "incremental": true,                   /* Enable incremental compilation */
-    "target": "es6",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */
-    "module": "commonjs",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
-    // "allowJs": true,                       /* Allow javascript files to be compiled. */
-    // "checkJs": true,                       /* Report errors in .js files. */
-    // "jsx": "preserve",                     /* Specify JSX code generation: 'preserve', 'react-native', or 'react'. */
-    // "declaration": true,                   /* Generates corresponding '.d.ts' file. */
-    // "declarationMap": true,                /* Generates a sourcemap for each corresponding '.d.ts' file. */
-    // "sourceMap": true,                     /* Generates corresponding '.map' file. */
-    // "outFile": "./",                       /* Concatenate and emit output to single file. */
-    "outDir": "./lib",                        /* Redirect output structure to the directory. */
-    "rootDir": "./src",                       /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
-    // "composite": true,                     /* Enable project compilation */
-    // "tsBuildInfoFile": "./",               /* Specify file to store incremental compilation information */
-    // "removeComments": true,                /* Do not emit comments to output. */
-    // "noEmit": true,                        /* Do not emit outputs. */
-    // "importHelpers": true,                 /* Import emit helpers from 'tslib'. */
-    // "downlevelIteration": true,            /* Provide full support for iterables in 'for-of', spread, and destructuring when targeting 'ES5' or 'ES3'. */
-    // "isolatedModules": true,               /* Transpile each file as a separate module (similar to 'ts.transpileModule'). */
-
-    /* Strict Type-Checking Options */
-    "strict": true,                           /* Enable all strict type-checking options. */
-    "noImplicitAny": false,                 /* Raise error on expressions and declarations with an implied 'any' type. */
-    // "strictNullChecks": true,              /* Enable strict null checks. */
-    // "strictFunctionTypes": true,           /* Enable strict checking of function types. */
-    // "strictBindCallApply": true,           /* Enable strict 'bind', 'call', and 'apply' methods on functions. */
-    // "strictPropertyInitialization": true,  /* Enable strict checking of property initialization in classes. */
-    // "noImplicitThis": true,                /* Raise error on 'this' expressions with an implied 'any' type. */
-    // "alwaysStrict": true,                  /* Parse in strict mode and emit "use strict" for each source file. */
-
-    /* Additional Checks */
-    // "noUnusedLocals": true,                /* Report errors on unused locals. */
-    // "noUnusedParameters": true,            /* Report errors on unused parameters. */
-    // "noImplicitReturns": true,             /* Report error when not all code paths in function return a value. */
-    // "noFallthroughCasesInSwitch": true,    /* Report errors for fallthrough cases in switch statement. */
-
-    /* Module Resolution Options */
-    // "moduleResolution": "node",            /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
-    // "baseUrl": "./",                       /* Base directory to resolve non-absolute module names. */
-    // "paths": {},                           /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
-    // "rootDirs": [],                        /* List of root folders whose combined content represents the structure of the project at runtime. */
-    // "typeRoots": [],                       /* List of folders to include type definitions from. */
-    // "types": [],                           /* Type declaration files to be included in compilation. */
-    // "allowSyntheticDefaultImports": true,  /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */
-    "esModuleInterop": true                   /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
-    // "preserveSymlinks": true,              /* Do not resolve the real path of symlinks. */
-    // "allowUmdGlobalAccess": true,          /* Allow accessing UMD globals from modules. */
-
-    /* Source Map Options */
-    // "sourceRoot": "",                      /* Specify the location where debugger should locate TypeScript files instead of source locations. */
-    // "mapRoot": "",                         /* Specify the location where debugger should locate map files instead of generated locations. */
-    // "inlineSourceMap": true,               /* Emit a single file with source maps instead of having a separate file. */
-    // "inlineSources": true,                 /* Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set. */
-
-    /* Experimental Options */
-    // "experimentalDecorators": true,        /* Enables experimental support for ES7 decorators. */
-    // "emitDecoratorMetadata": true,         /* Enables experimental support for emitting type metadata for decorators. */
-  },
-  "exclude": ["node_modules", "**/*.test.ts"]
-}