fix: don't use the default GitHub token for Enterprise

The token on Enterprise instances is not valid for github.com.

Resolves #196.

.github/workflows/test.yml

@@ -12,7 +12,7 @@ jobs:
         os: [ubuntu-latest, macos-latest]
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Install Nix
       uses: ./
       with:
@@ -28,7 +28,7 @@ jobs:
         os: [ubuntu-latest, macos-latest]
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Install Nix
       uses: ./
       with:
@@ -42,7 +42,7 @@ jobs:
         os: [ubuntu-latest, macos-latest]
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Install Nix
       uses: ./
       with:
@@ -58,7 +58,7 @@ jobs:
         os: [ubuntu-latest, macos-latest]
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Install Nix
       uses: ./
     - run: nix flake show github:NixOS/nixpkgs
@@ -69,7 +69,7 @@ jobs:
         os: [ubuntu-latest, macos-latest]
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Install Nix
       uses: ./
       with:
@@ -84,7 +84,7 @@ jobs:
           os: [ubuntu-latest, macos-latest]
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Install Nix
       uses: ./
       with:
@@ -98,7 +98,7 @@ jobs:
           os: [ubuntu-latest]
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - run: curl https://raw.githubusercontent.com/nektos/act/master/install.sh | sudo bash
     - run: docker pull ghcr.io/catthehacker/ubuntu:js-20.04
     - run: ./bin/act -P ubuntu-latest=ghcr.io/catthehacker/ubuntu:js-20.04 push -j simple-build

README.md

@@ -6,8 +6,8 @@ Installs [Nix](https://nixos.org/nix/) on GitHub Actions for the supported platf
 
 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
 
@@ -34,7 +34,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v3
-    - uses: cachix/install-nix-action@v20
+    - uses: cachix/install-nix-action@v22
       with:
         nix_path: nixpkgs=channel:nixos-unstable
     - run: nix-build
@@ -52,7 +52,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v3
-    - uses: cachix/install-nix-action@v20
+    - uses: cachix/install-nix-action@v22
       with:
         github_access_token: ${{ secrets.GITHUB_TOKEN }}
     - run: nix build
@@ -120,7 +120,7 @@ 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@v20
+- uses: cachix/install-nix-action@v22
   with:
     extra_nix_config: |
       trusted-public-keys = hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ= cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=

install-nix.sh

@@ -17,6 +17,7 @@ trap 'rm -rf "$workdir"' EXIT
 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
@@ -24,11 +25,18 @@ if [[ $OSTYPE =~ darwin ]]; then
 fi
 # Allow binary caches for user
 add_config "trusted-users = root ${USER:-}"
-# Add github access token
+# Add a GitHub access token.
+# Token-less access is subject to lower rate limits.
 if [[ -n "${INPUT_GITHUB_ACCESS_TOKEN:-}" ]]; then
+  echo "::debug::Using the provided github_access_token for github.com"
   add_config "access-tokens = github.com=$INPUT_GITHUB_ACCESS_TOKEN"
-elif [[ -n "${GITHUB_TOKEN:-}" ]]; then
+# 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
@@ -69,7 +77,7 @@ 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-2.16.1/install}"
+while ! curl -sS -o "$workdir/install" -v --fail -L "${INPUT_INSTALL_URL:-https://releases.nixos.org/nix/nix-2.17.0/install}"
 do
   sleep 1
   ((curl_retries--))