remove unused file

Add NIX_PATH action input

.github/workflows/test.yml

@@ -2,6 +2,7 @@ name: "install-nix-action test"
 on:
   pull_request:
   push:
+
 jobs:
   simple-build:
     strategy:
@@ -19,6 +20,7 @@ jobs:
     # cachix should be available and be able to configure a cache
     - run: cachix use cachix
     - run: nix-build test.nix
+
   no-channel:
     strategy:
       matrix:
@@ -34,3 +36,19 @@ jobs:
         skip_adding_nixpkgs_channel: true
     - run: nix-build test.nix && exit 1 || echo "OK"
     - run: NIX_PATH=nixpkgs=https://github.com/NixOS/nixpkgs/tarball/ab5863afada3c1b50fc43bf774b75ea71b287cde nix-build test.nix
+
+  custom-nix-path:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+    - uses: actions/checkout@v2
+    - run: yarn install --frozen-lockfile
+    - run: yarn build
+    - name: Install Nix
+      uses: ./
+      with:
+        nix_path: nixpkgs=channel:nixos-20.03
+    - run: test $NIX_PATH == "nixpkgs=channel:nixos-20.03"
+    - run: nix-build test.nix

README.md

@@ -18,17 +18,24 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
-    - uses: cachix/install-nix-action@v8
+    - uses: cachix/install-nix-action@v9
+      with:
+        nix_path: nixpkgs=channel:nixos-unstable
     - run: nix-build
 ```
 
-
-See [action.yml](action.yml) for all options.
-
 See also [cachix-action](https://github.com/cachix/cachix-action) for
 simple binary cache setup to speed up your builds and share binaries
 with developers.
 
+## Options `with: ...`
+
+- `install_url`: specify URL to install Nix from (mostly useful for testing non-stable releases)
+
+- `nix_path`: set `NIX_PATH` environment variable (if set `skip_adding_nixpkgs_channel` will be implicitly enabled)
+
+- `skip_adding_nixpkgs_channel`: set to `true` to skip adding nixpkgs-unstable channel (and save ~5s for each job build)
+
 ---
 
 ## Hacking

action.yml

@@ -4,6 +4,8 @@ author: 'Domen Kožar'
 inputs:
   install_url:
     description: 'Installation URL that will contain a script to install Nix'
+  nix_path:
+    description: 'Set NIX_PATH environment variable. If set "skip_adding_nixpkgs_channel" will be implicitly enabled'
   skip_adding_nixpkgs_channel:
     description: 'Skip adding nixpkgs-unstable channel'
 branding:

lib/create-darwin-volume.sh

@@ -1,102 +0,0 @@
-#!/usr/bin/env bash
-set -e
-
-root_disks() {
-    diskutil list -plist /
-}
-
-apfs_volumes_for() {
-    disk=$1
-    diskutil apfs list -plist "$disk"
-}
-
-disk_identifier() {
-    xpath "/plist/dict/key[text()='WholeDisks']/following-sibling::array[1]/string/text()" 2>/dev/null
-}
-
-volume_get() {
-    key=$1 i=$2
-    xpath "/plist/dict/array/dict/key[text()='Volumes']/following-sibling::array/dict[$i]/key[text()='$key']/following-sibling::string[1]/text()" 2> /dev/null
-}
-
-find_nix_volume() {
-    disk=$1
-    i=1
-    volumes=$(apfs_volumes_for "$disk")
-    while true; do
-        name=$(echo "$volumes" | volume_get "Name" "$i")
-        if [ -z "$name" ]; then
-            break
-        fi
-        case "$name" in
-            [Nn]ix*)
-                echo "$name"
-                break
-                ;;
-        esac
-        i=$((i+1))
-    done
-}
-
-test_fstab() {
-    grep -q "/nix" /etc/fstab 2>/dev/null
-}
-
-test_synthetic_conf() {
-    grep -q "^nix" /etc/synthetic.conf 2>/dev/null
-}
-
-test_nix() {
-    test -d "/nix"
-}
-
-main() {
-    (
-        echo ""
-        echo "     ------------------------------------------------------------------ "
-        echo "    | This installer will create a volume for the nix store and        |"
-        echo "    | configure it to mount at /nix.  Follow these steps to uninstall. |"
-        echo "     ------------------------------------------------------------------ "
-        echo ""
-        echo "  1. Remove the entry from fstab using 'sudo vifs'"
-        echo "  2. Destroy the data volume using 'diskutil apfs deleteVolume'"
-        echo "  3. Delete /etc/synthetic.conf"
-        echo ""
-    ) >&2
-
-    if [ -L "/nix" ]; then
-        echo "error: /nix is a symlink, please remove it or edit synthetic.conf (requires reboot)" >&2
-        echo "  /nix -> $(readlink "/nix")" >&2
-        exit 2
-    fi
-
-    if ! test_synthetic_conf; then
-        echo "Configuring /etc/synthetic.conf..." >&2
-        echo nix | sudo tee /etc/synthetic.conf
-        /System/Library/Filesystems/apfs.fs/Contents/Resources/apfs.util -B
-    fi
-
-    if ! test_nix; then
-        echo "Creating mountpoint for /nix..." >&2
-        sudo mkdir /nix
-    fi
-
-    disk=$(root_disks | disk_identifier)
-    volume=$(find_nix_volume "$disk")
-    if [ -z "$volume" ]; then
-        echo "Creating a Nix Store volume..." >&2
-        sudo diskutil apfs addVolume "$disk" APFS 'Nix Store' -mountpoint /nix
-        volume="Nix Store"
-    else
-        echo "Using existing '$volume' volume" >&2
-    fi
-
-    if ! test_fstab; then
-        echo "Configuring /etc/fstab..." >&2
-        label=$(echo "$volume" | sed 's/ /\\040/g')
-        printf "\$a\nLABEL=%s /nix apfs rw\n.\nwq\n" "$label" | EDITOR=ed sudo vifs
-        sudo defaults write /Library/Preferences/SystemConfiguration/autodiskmount AutomountDisksWithoutUserLogin -bool true
-    fi
-}
-
-main "$@"

lib/install-nix.sh

@@ -6,10 +6,11 @@ sudo sh -c 'echo max-jobs = auto >> /tmp/nix.conf'
 # Allow binary caches for runner user
 sudo sh -c 'echo trusted-users = root runner >> /tmp/nix.conf'
 
-if [[ $INPUT_SKIP_ADDING_NIXPKGS_CHANNEL = "true" ]]; then
+if [[ $INPUT_SKIP_ADDING_NIXPKGS_CHANNEL = "true" || $INPUT_NIX_PATH != "" ]]; then
   extra_cmd=--no-channel-add
 else
   extra_cmd=
+  INPUT_NIX_PATH="/nix/var/nix/profiles/per-user/root/channels"
 fi
 
 sh <(curl -L ${INPUT_INSTALL_URL:-https://nixos.org/nix/install}) \
@@ -29,6 +30,7 @@ fi
 # Set paths
 echo "::add-path::/nix/var/nix/profiles/per-user/runner/profile/bin"
 echo "::add-path::/nix/var/nix/profiles/default/bin"
-if [[ $INPUT_SKIP_ADDING_NIXPKGS_CHANNEL != "true" ]]; then
-echo "::set-env name=NIX_PATH::/nix/var/nix/profiles/per-user/root/channels"
+
+if [[ $INPUT_NIX_PATH != "" ]]; then
+  echo "::set-env name=NIX_PATH::${INPUT_NIX_PATH}"
 fi