Disable default channel installation

.github/workflows/test.yml

@@ -10,7 +10,6 @@ jobs:
       matrix:
         os: [ubuntu-18.04, macos-latest]
         nixPath:
-          -
           - nixpkgs=channel:nixos-unstable
           - nixpkgs=https://github.com/NixOS/nixpkgs/archive/master.tar.gz
 

action.yml

@@ -4,7 +4,7 @@ author: 'Domen Kožar'
 inputs:
   NIX_PATH:
     description: 'Set NIX_PATH environment variable'
-    required: false
+    required: true
 branding:
   color: 'blue'
   icon: 'sun'

lib/install-nix.sh

@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
-nixPath="${1:-/nix/var/nix/profiles/per-user/root/channels}"
+nixPath="${1}"
 
 export here=$(dirname "${BASH_SOURCE[0]}")
 
@@ -28,6 +28,9 @@ nixConf
 # Needed due to multi-user being too defensive
 export ALLOW_PREEXISTING_INSTALLATION=1
 
+# Disable installation of default channel
+export NIX_INSTALLER_NO_CHANNEL_ADD=1
+
 sh <(curl -L https://nixos.org/nix/install) --daemon
 
 # write nix.conf again as installation overwrites it

lib/main.js

@@ -26,6 +26,6 @@ function awaitSocket() {
         });
     });
 }
-child_process_1.execFileSync(`${__dirname}/install-nix.sh`, [core_1.getInput('NIX_PATH')], { stdio: 'inherit' });
+child_process_1.execFileSync(`${__dirname}/install-nix.sh`, [core_1.getInput('NIX_PATH', { required: true })], { stdio: 'inherit' });
 // nc doesn't work correctly on macOS :(
 awaitSocket();

src/main.ts

@@ -15,7 +15,7 @@ async function awaitSocket() {
   });
 }
 
-execFileSync(`${__dirname}/install-nix.sh`, [getInput('NIX_PATH')], { stdio: 'inherit' });
+execFileSync(`${__dirname}/install-nix.sh`, [getInput('NIX_PATH', { required: true })], { stdio: 'inherit' });
 
 // nc doesn't work correctly on macOS :(
 awaitSocket();