Initial commit

src/main.ts

@@ -0,0 +1,30 @@
+import * as core from '@actions/core';
+import * as exec from '@actions/exec';
+import * as tc from '@actions/tool-cache';
+import {homedir, userInfo} from 'os';
+import {existsSync} from 'fs';
+
+async function run() {
+  try {
+    const home = homedir();
+    const {username} = userInfo();
+    const PATH = process.env.PATH;  
+    const CERTS_PATH = home + '/.nix-profile/etc/ssl/certs/ca-bundle.crt';
+
+    // TODO: retry due to all the things that go wrong
+    const nixInstall = await tc.downloadTool('https://nixos.org/nix/install');
+    await exec.exec("sh", [nixInstall]);
+    core.exportVariable('PATH', `${PATH}:${home}/.nix-profile/bin`)
+    core.exportVariable('NIX_PATH', `/nix/var/nix/profiles/per-user/${username}/channels`)
+
+    // macOS needs certificates hints
+    if (existsSync(CERTS_PATH)) {
+      core.exportVariable('NIX_SSL_CERT_FILE', CERTS_PATH);
+    }
+  } catch (error) {
+    core.setFailed(`Action failed with error: ${error}`);
+    throw(error);
+  } 
+}
+
+run();