Allow installing cachix globally for self-hosted runners

package.json

@@ -21,12 +21,14 @@
   "license": "ASL2",
   "dependencies": {
     "@actions/core": "^1.2.6",
-    "@actions/exec": "^1.0.1"
+    "@actions/exec": "^1.0.1",
+    "which": "^2.0.2"
   },
   "devDependencies": {
     "@types/jest": "^24.0.13",
     "@types/node": "^12.0.4",
     "@zeit/ncc": "^0.20.5",
+    "@types/which": "^2.0.1",
     "jest": "^24.8.0",
     "jest-circus": "^24.7.1",
     "ts-jest": "^24.0.2",

src/main.ts

@@ -1,6 +1,7 @@
 import * as core from '@actions/core';
 import * as coreCommand from '@actions/core/lib/command'
 import * as exec from '@actions/exec';
+import which from 'which';
 
 export const IsPost = !!process.env['STATE_isPost']
 
@@ -12,21 +13,26 @@ const authToken = core.getInput('authToken')
 const skipPush = core.getInput('skipPush');
 const pathsToPush = core.getInput('pathsToPush');
 const pushFilter = core.getInput('pushFilter');
-const cachixExecutable = process.env.HOME + '/.nix-profile/bin/cachix';
 const cachixArgs = core.getInput('cachixArgs');
 const installCommand =
   core.getInput('installCommand') ||
   "nix-env --quiet -j8 -iA cachix -f https://cachix.org/api/v1/install";
 
 async function setup() {
   try {
-    core.startGroup('Cachix: installing')
-    await exec.exec('bash', ['-c', installCommand]);
+    if(!which.sync('cachix', { nothrow: true })) {
+      core.startGroup('Cachix: installing')
+      await exec.exec('bash', ['-c', installCommand]);
+      core.endGroup()
+    }
+
+    core.startGroup('Cachix: checking version')
+    await exec.exec('cachix', ['--version']);
     core.endGroup()
 
     // for managed signing key and private caches
     if (authToken !== "") {
-      await exec.exec(cachixExecutable, ['authtoken', authToken]);
+      await exec.exec('cachix', ['authtoken', authToken]);
     }
 
     core.startGroup(`Cachix: using cache ` + name);
@@ -59,7 +65,7 @@ async function upload() {
     if (skipPush === 'true') {
       core.info('Pushing is disabled as skipPush is set to true');
     } else if (signingKey !== "" || authToken !== "") {
-      await exec.exec(`${__dirname}/push-paths.sh`, [cachixExecutable, cachixArgs, name, pathsToPush, pushFilter]);
+      await exec.exec(`${__dirname}/push-paths.sh`, ['cachix', cachixArgs, name, pathsToPush, pushFilter]);
     } else {
       core.info('Pushing is disabled as signingKey nor authToken are set (or are empty?) in your YAML file.');
     }

yarn.lock

@@ -432,6 +432,11 @@
   resolved "https://registry.yarnpkg.com/@types/stack-utils/-/stack-utils-1.0.1.tgz#0a851d3bd96498fa25c33ab7278ed3bd65f06c3e"
   integrity sha512-l42BggppR6zLmpfU6fq9HEa2oGPEI8yrSPL3GITjfRInppYFahObbIQOQK3UGxEnyQpltZLaPe75046NOZQikw==
 
+"@types/which@^2.0.1":
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/@types/which/-/which-2.0.1.tgz#27ecd67f915b7c3d6ba552135bb1eecd66e63501"
+  integrity sha512-Jjakcv8Roqtio6w1gr0D7y6twbhx6gGgFGF5BLwajPpnOIOxFkakFhCq+LmyyeAz7BX6ULrjBOxdKaCDy+4+dQ==
+
 "@types/yargs-parser@*":
   version "15.0.0"
   resolved "https://registry.yarnpkg.com/@types/yargs-parser/-/yargs-parser-15.0.0.tgz#cb3f9f741869e20cce330ffbeb9271590483882d"
@@ -3332,6 +3337,13 @@ which@^1.2.9, which@^1.3.0:
   dependencies:
     isexe "^2.0.0"
 
+which@^2.0.2:
+  version "2.0.2"
+  resolved "https://registry.yarnpkg.com/which/-/which-2.0.2.tgz#7c6a8dd0a636a0327e10b59c9286eee93f3f51b1"
+  integrity sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==
+  dependencies:
+    isexe "^2.0.0"
+
 word-wrap@~1.2.3:
   version "1.2.3"
   resolved "https://registry.yarnpkg.com/word-wrap/-/word-wrap-1.2.3.tgz#610636f6b1f703891bd34771ccb17fb93b47079c"