fix #5: set max-jobs = auto

test that build produces no diff

README.md

@@ -18,7 +18,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v1
-    - uses: cachix/install-nix-action@v1
+    - uses: cachix/install-nix-action@v2
     - run: nix-build
 ```
 

lib/main.js

@@ -30,7 +30,9 @@ function run() {
             const CERTS_PATH = home + '/.nix-profile/etc/ssl/certs/ca-bundle.crt';
             // Workaround a segfault: https://github.com/NixOS/nix/issues/2733
             yield exec.exec("sudo", ["mkdir", "-p", "/etc/nix"]);
-            yield exec.exec("sudo", ["echo", "http2 = false", ">>", "/etc/nix/nix.conf"]);
+            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"]);
             // TODO: retry due to all the things that go wrong
             const nixInstall = yield tc.downloadTool('https://nixos.org/nix/install');
             yield exec.exec("sh", [nixInstall]);

src/main.ts

@@ -13,7 +13,10 @@ async function run() {
 
     // Workaround a segfault: https://github.com/NixOS/nix/issues/2733
     await exec.exec("sudo", ["mkdir", "-p", "/etc/nix"]);
-    await exec.exec("sudo", ["echo", "http2 = false", ">>", "/etc/nix/nix.conf"]);
+    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"]);
 
     // TODO: retry due to all the things that go wrong
     const nixInstall = await tc.downloadTool('https://nixos.org/nix/install');