diff --git a/lib/install-nix.sh b/lib/install-nix.sh
new file mode 100755
index 0000000..399222b
--- /dev/null
+++ b/lib/install-nix.sh
@@ -0,0 +1,48 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+export here=$(dirname "${BASH_SOURCE[0]}")
+
+nixConf() {
+  sudo mkdir -p /etc/nix
+  # Workaround a segfault: https://github.com/NixOS/nix/issues/2733
+  sudo sh -c 'echo http2 = false >> /etc/nix/nix.conf'
+  # Set jobs to number of cores
+  sudo sh -c 'echo max-jobs = auto >> /etc/nix/nix.conf'
+  # Allow binary caches for runner user
+  sudo sh -c 'echo trusted-users = root runner >> /etc/nix/nix.conf'
+}
+
+if [[ $OSTYPE =~ darwin ]]; then
+  # Catalina workaround https://github.com/NixOS/nix/issues/2925
+  $here/create-darwin-volume.sh
+
+  # Disable spotlight indexing of /nix to speed up performance
+  sudo mdutil -i off /nix
+fi
+
+nixConf
+
+# Needed due to multi-user being too defensive
+export ALLOW_PREEXISTING_INSTALLATION=1
+
+sh <(curl https://nixos.org/nix/install) --daemon
+
+# write nix.conf again as installation overwrites it
+nixConf
+
+# macOS needs certificates hints
+if [[ $OSTYPE =~ darwin ]]; then
+  cert_file=/nix/var/nix/profiles/default/etc/ssl/certs/ca-bundle.crt
+  echo "::set-env name=NIX_SSL_CERT_FILE::$cert_file"
+  export NIX_SSL_CERT_FILE=$cert_file
+  sudo launchctl setenv NIX_SSL_CERT_FILE "$cert_file"
+fi
+
+# Reload the daemon to pick up changes
+sudo pkill -HUP nix-daemon
+
+# Set paths
+echo "::add-path::/nix/var/nix/profiles/per-user/runner/profile/bin"
+echo "::add-path::/nix/var/nix/profiles/default/bin"
+echo "::set-env name=NIX_PATH::/nix/var/nix/profiles/per-user/root/channels"
\ No newline at end of file
diff --git a/lib/main.js b/lib/main.js
index 5afb8a3..abb019e 100644
--- a/lib/main.js
+++ b/lib/main.js
@@ -8,67 +8,10 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
         step((generator = generator.apply(thisArg, _arguments || [])).next());
     });
 };
-var __importStar = (this && this.__importStar) || function (mod) {
-    if (mod && mod.__esModule) return mod;
-    var result = {};
-    if (mod != null) for (var k in mod) if (Object.hasOwnProperty.call(mod, k)) result[k] = mod[k];
-    result["default"] = mod;
-    return result;
-};
 Object.defineProperty(exports, "__esModule", { value: true });
-const core = __importStar(require("@actions/core"));
-const exec = __importStar(require("@actions/exec"));
-const tc = __importStar(require("@actions/tool-cache"));
 const child_process_1 = require("child_process");
-const os_1 = require("os");
 const process_1 = require("process");
 const net_1 = require("net");
-function nixConf() {
-    return __awaiter(this, void 0, void 0, function* () {
-        // Workaround a segfault: https://github.com/NixOS/nix/issues/2733
-        yield exec.exec("sudo", ["mkdir", "-p", "/etc/nix"]);
-        yield exec.exec("sudo", ["sh", "-c", "echo http2 = false >> /etc/nix/nix.conf"]);
-        // Set jobs to number of cores
-        yield exec.exec("sudo", ["sh", "-c", "echo max-jobs = auto >> /etc/nix/nix.conf"]);
-        // Allow binary caches for runner user
-        yield exec.exec("sudo", ["sh", "-c", "echo trusted-users = root runner >> /etc/nix/nix.conf"]);
-    });
-}
-function run() {
-    return __awaiter(this, void 0, void 0, function* () {
-        try {
-            const PATH = process.env.PATH;
-            yield nixConf();
-            // Catalina workaround https://github.com/NixOS/nix/issues/2925
-            if (os_1.type() == "Darwin") {
-                child_process_1.execFileSync(`${__dirname}/create-darwin-volume.sh`, { stdio: 'inherit' });
-                // Disable spotlight indexing of /nix to speed up performance
-                yield exec.exec("sudo", ["mdutil", "-i", "off", "/nix"]);
-            }
-            // Needed due to multi-user being too defensive
-            core.exportVariable('ALLOW_PREEXISTING_INSTALLATION', "1");
-            // TODO: retry due to all the things that can go wrong
-            const nixInstall = yield tc.downloadTool('https://nixos.org/nix/install');
-            yield exec.exec("sh", [nixInstall, "--daemon"]);
-            // write nix.conf again as installation overwrites it, reload the daemon to pick up changes
-            yield nixConf();
-            yield exec.exec("sudo", ["pkill", "-HUP", "nix-daemon"]);
-            // setup env
-            core.exportVariable('PATH', `${PATH}:/nix/var/nix/profiles/default/bin:/nix/var/nix/profiles/per-user/runner/profile/bin`);
-            core.exportVariable('NIX_PATH', `/nix/var/nix/profiles/per-user/root/channels`);
-            if (os_1.type() == "Darwin") {
-                // macOS needs certificates hints
-                core.exportVariable('NIX_SSL_CERT_FILE', '/nix/var/nix/profiles/default/etc/ssl/certs/ca-bundle.crt');
-                // TODO: nc doesn't work correctly on macOS :(
-                yield awaitSocket();
-            }
-        }
-        catch (error) {
-            core.setFailed(`Action failed with error: ${error}`);
-            throw (error);
-        }
-    });
-}
 function awaitSocket() {
     return __awaiter(this, void 0, void 0, function* () {
         const daemonSocket = net_1.createConnection({ path: '/nix/var/nix/daemon-socket/socket' });
@@ -82,4 +25,6 @@ function awaitSocket() {
         });
     });
 }
-run();
+child_process_1.execFileSync(`${__dirname}/install-nix.sh`, { stdio: 'inherit' });
+// nc doesn't work correctly on macOS :(
+awaitSocket();
diff --git a/lib/utils.js b/lib/utils.js
deleted file mode 100644
index 6dbeef2..0000000
--- a/lib/utils.js
+++ /dev/null
@@ -1,8 +0,0 @@
-"use strict";
-Object.defineProperty(exports, "__esModule", { value: true });
-function extrasperse(elem, array) {
-    const init = [];
-    return array.reduce((r, a) => r.concat(elem, a), init);
-}
-exports.extrasperse = extrasperse;
-;
diff --git a/src/main.ts b/src/main.ts
index 565186b..07313e3 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -1,63 +1,6 @@
-import * as core from '@actions/core';
-import * as exec from '@actions/exec';
-import * as tc from '@actions/tool-cache';
-import {execFileSync} from 'child_process';
-import {type} from 'os';
-import {exit} from 'process';
-import {createConnection} from 'net';
-
-async function nixConf() {
-    // Workaround a segfault: https://github.com/NixOS/nix/issues/2733
-    await exec.exec("sudo", ["mkdir", "-p", "/etc/nix"]);
-    await exec.exec("sudo", ["sh", "-c", "echo http2 = false >> /etc/nix/nix.conf"]);
-
-    // Set jobs to number of cores
-    await exec.exec("sudo", ["sh", "-c", "echo max-jobs = auto >> /etc/nix/nix.conf"]);
-
-    // Allow binary caches for runner user
-    await exec.exec("sudo", ["sh", "-c", "echo trusted-users = root runner >> /etc/nix/nix.conf"]);
-}
-
-async function run() {
-  try {
-    const PATH = process.env.PATH;
- 
-    await nixConf();
-
-    // Catalina workaround https://github.com/NixOS/nix/issues/2925
-    if (type() == "Darwin") {
-      execFileSync(`${__dirname}/create-darwin-volume.sh`, { stdio: 'inherit' });
-
-      // Disable spotlight indexing of /nix to speed up performance
-      await exec.exec("sudo", ["mdutil", "-i", "off", "/nix"]);
-    }
-
-    // Needed due to multi-user being too defensive
-    core.exportVariable('ALLOW_PREEXISTING_INSTALLATION', "1"); 
-
-    // TODO: retry due to all the things that can go wrong
-    const nixInstall = await tc.downloadTool('https://nixos.org/nix/install');
-    await exec.exec("sh", [nixInstall, "--daemon"]);
-
-    // write nix.conf again as installation overwrites it, reload the daemon to pick up changes
-    await nixConf();
-    await exec.exec("sudo", ["pkill", "-HUP", "nix-daemon"]);
-
-    // setup env
-    core.exportVariable('PATH', `${PATH}:/nix/var/nix/profiles/default/bin:/nix/var/nix/profiles/per-user/runner/profile/bin`)
-    core.exportVariable('NIX_PATH', `/nix/var/nix/profiles/per-user/root/channels`)
-    if (type() == "Darwin") {
-      // macOS needs certificates hints
-      core.exportVariable('NIX_SSL_CERT_FILE', '/nix/var/nix/profiles/default/etc/ssl/certs/ca-bundle.crt');
-
-      // TODO: nc doesn't work correctly on macOS :(
-      await awaitSocket();
-    }
-  } catch (error) {
-    core.setFailed(`Action failed with error: ${error}`);
-    throw(error);
-  }
-}
+import { execFileSync } from 'child_process';
+import { exit } from 'process';
+import { createConnection } from 'net';
 
 async function awaitSocket() {
   const daemonSocket = createConnection({ path: '/nix/var/nix/daemon-socket/socket' });
@@ -71,4 +14,7 @@ async function awaitSocket() {
   });
 }
 
-run();
+execFileSync(`${__dirname}/install-nix.sh`, { stdio: 'inherit' });
+
+// nc doesn't work correctly on macOS :(
+awaitSocket();
\ No newline at end of file