freshen up README

update flakes

.github/workflows/test.yml

@@ -12,7 +12,7 @@ jobs:
         os: [ubuntu-latest, macos-latest]
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v2.3.4
     - run: yarn install --frozen-lockfile
     - run: yarn build
     - name: Install Nix
@@ -31,7 +31,7 @@ jobs:
         os: [ubuntu-latest, macos-latest]
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v2.3.4
     - run: yarn install --frozen-lockfile
     - run: yarn build
     - name: Install Nix
@@ -47,7 +47,7 @@ jobs:
         os: [ubuntu-latest, macos-latest]
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v2.3.4
     - run: yarn install --frozen-lockfile
     - run: yarn build
     - name: Install Nix
@@ -58,3 +58,38 @@ jobs:
           sandbox = relaxed
     - run: cat /etc/nix/nix.conf
     - run: nix-build test.nix --arg noChroot true
+
+  flakes:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+    - uses: actions/checkout@v2.3.4
+    - run: yarn install --frozen-lockfile
+    - run: yarn build
+    - name: Install Nix
+      uses: ./
+      with:
+        install_url: https://nixos-nix-install-tests.cachix.org/serve/lb41az54kzk6j12p81br4bczary7m145/install
+        install_options: '--tarball-url-prefix https://nixos-nix-install-tests.cachix.org/serve'
+        extra_nix_config: |
+          experimental-features = nix-command flakes
+    - run: nix flake show github:NixOS/nixpkgs
+
+  installer-options:
+    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
+        install_url: https://nixos-nix-install-tests.cachix.org/serve/lb41az54kzk6j12p81br4bczary7m145/install
+        install_options: '--tarball-url-prefix https://nixos-nix-install-tests.cachix.org/serve'
+    - run: nix-build test.nix

README.md

@@ -32,8 +32,8 @@ jobs:
   tests:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
-    - uses: cachix/install-nix-action@v11
+    - uses: actions/checkout@v2.3.4
+    - uses: cachix/install-nix-action@v12
       with:
         nix_path: nixpkgs=channel:nixos-unstable
     - run: nix-build
@@ -51,18 +51,18 @@ jobs:
   tests:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v2.3.4
+    - uses: cachix/install-nix-action@v12
       with:
-          # Nix Flakes doesn't work on shallow clones
-          fetch-depth: 0
-    - uses: cachix/install-nix-action@v11
-      with:
-        install_url: https://github.com/numtide/nix-flakes-installer/releases/download/nix-3.0pre20200820_4d77513/install
+        install_url: https://nixos-nix-install-tests.cachix.org/serve/lb41az54kzk6j12p81br4bczary7m145/install
+        install_options: '--tarball-url-prefix https://nixos-nix-install-tests.cachix.org/serve'
         extra_nix_config: |
           experimental-features = nix-command flakes
     - run: nix-build
 ```
 
+To install Nix from any commit, go to [the corresponding installer_test action](https://github.com/NixOS/nix/runs/2219534360) and click on "Run cachix/install-nix-action@XX" step and expand the first line.
+
 ## 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)
@@ -75,15 +75,30 @@ jobs:
 
 ## FAQ
 
-### Is it possible to run NixOS tests / Qemu+KVM with GitHub Actions?
-
-[Currently GitHub Actions are not running on Azure instance types that support nested virtualization](https://github.com/actions/virtual-environments/issues/183#issuecomment-610723516).
-
-### How do I print nixpkgs version with the channel I have configured?
+### How do I print nixpkgs version I have configured?
 
 
 ```nix-instantiate --eval -E '(import <nixpkgs> {}).lib.version'```
 
+### How can I run NixOS tests?
+
+With the following inputs:
+
+```yaml
+    - uses: cachix/install-nix-action@vXX
+      with:
+        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`?
+
+```
+nix-env -i mypackage -f '<nixpkgs>'
+```
+
 ## Hacking
 
 Install the dependencies

action.yml

@@ -3,7 +3,9 @@ description: 'Installs Nix on GitHub Actions for the supported platforms: Linux
 author: 'Domen Kožar'
 inputs:
   install_url:
-    description: 'Installation URL that will contain a script to install Nix'
+    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:

lib/install-nix.sh

@@ -27,7 +27,12 @@ installer_options=(
   --darwin-use-unencrypted-nix-store-volume
   --nix-extra-conf-file /tmp/nix.conf
 )
+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[@]}"
 # On self-hosted runners we don't need to install more than once
 if [[ ! -d /nix/store ]] 
 then 
@@ -40,15 +45,15 @@ if [[ $OSTYPE =~ darwin ]]; then
 
   # macOS needs certificates hints
   cert_file=/nix/var/nix/profiles/default/etc/ssl/certs/ca-bundle.crt
-  echo "NIX_SSL_CERT_FILE=$cert_file" >> $GITHUB_ENV
+  echo "NIX_SSL_CERT_FILE=$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" >> $GITHUB_PATH
+echo "/nix/var/nix/profiles/per-user/$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}" >> $GITHUB_ENV
+  echo "NIX_PATH=${INPUT_NIX_PATH}" >> "$GITHUB_ENV"
 fi

yarn.lock

@@ -1452,9 +1452,9 @@ inherits@2, inherits@~2.0.3:
   integrity sha512-k/vGaX4/Yla3WzyMCvTQOXYeIHvqOKtnqBduzTHpzpQZzAskKMhZ2K+EnBiSM9zGSoIFeMpXKxa4dYeZIQqewQ==
 
 ini@~1.3.0:
-  version "1.3.5"
-  resolved "https://registry.yarnpkg.com/ini/-/ini-1.3.5.tgz#eee25f56db1c9ec6085e0c22778083f596abf927"
-  integrity sha512-RZY5huIKCMRWDUqZlEi72f/lmXKMvuszcMBduliQ3nnWbx9X/ZBQO7DijMEYS9EhHBb2qacRUMtC7svLwe0lcw==
+  version "1.3.8"
+  resolved "https://registry.yarnpkg.com/ini/-/ini-1.3.8.tgz#a29da425b48806f34767a4efce397269af28432c"
+  integrity sha512-JV/yugV2uzW5iMRSiZAyDtQd+nxtUnjeLt0acNdw98kKLrvuRVyB80tsREOE7yvGVgalhZ6RNXCmEHkUKBKxew==
 
 invariant@^2.2.4:
   version "2.2.4"
@@ -3630,9 +3630,9 @@ xml-name-validator@^3.0.0:
   integrity sha512-A5CUptxDsvxKJEU3yO6DuWBSJz/qizqzJKOMIfUJHETbBw/sFaDxgd6fxm1ewUaM0jZ444Fc5vC5ROYurg/4Pw==
 
 y18n@^4.0.0:
-  version "4.0.0"
-  resolved "https://registry.yarnpkg.com/y18n/-/y18n-4.0.0.tgz#95ef94f85ecc81d007c264e190a120f0a3c8566b"
-  integrity sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w==
+  version "4.0.1"
+  resolved "https://registry.yarnpkg.com/y18n/-/y18n-4.0.1.tgz#8db2b83c31c5d75099bb890b23f3094891e247d4"
+  integrity sha512-wNcy4NvjMYL8gogWWYAO7ZFWFfHcbdbE57tZO8e4cbpj8tfUcwrwqSl3ad8HxpYWCdXcJUCeKKZS62Av1affwQ==
 
 yallist@^3.0.0, yallist@^3.0.3:
   version "3.1.0"