Get stuff building on NixOS proper

e2e/visual.spec.ts

@@ -26,6 +26,6 @@ for (const pageUrl of pages) {
 
       await page.evaluate(() => new Promise(requestAnimationFrame));
 
-      await expect(page).toHaveScreenshot({ fullPage: true });
+      await expect(page).toHaveScreenshot({ fullPage: true, timeout: 20_000 });
     });
 }

flake.nix

@@ -10,34 +10,41 @@
     flake-utils.lib.eachDefaultSystem (system:
       let pkgs = import nixpkgs { inherit system; };
           builtBlog = blog.defaultPackage.${system};
+	  blogWithRelativeLinks = pkgs.stdenv.mkDerivation {
+	    name = "blogWithRelativeLinks";
+            version = "1.0";
+	    buildInputs = [
+	      (pkgs.python3.withPackages (ps: [
+                ps.beautifulsoup4
+	        ps.lxml
+              ]))
+	    ];
+	    builtBlog = builtBlog;
+	    urlScript = pkgs.writeTextFile { name = "chatgpt-fix-root-URLs.py"; text = builtins.readFile ./scripts/chatgpt-fix-root-URLs.py; };
+	    builder = builtins.toFile "builder.sh" "
+              source $stdenv/setup
+              mkdir -p code $out
+              cp -r $builtBlog/* code
+              chmod -R u+w code
+	      (cd code && python3 $urlScript)
+	      cp -r code/* $out
+            ";
+	  };
       in {
         devShell = pkgs.mkShell {
           packages = [
             pkgs.nodejs
             pkgs.yarn
             pkgs.chromium
-            builtBlog
+	    pkgs.python3
           ];
 
-          nativeBuildInputs = [ pkgs.yarnConfigHook ];
-
-          # Must be named this for pkgs.yarnConfigHook
-          yarnOfflineCache = pkgs.fetchYarnDeps {
-            yarnLock = ./yarn.lock;
-            hash = "sha256-jUa1XkxJ2dS6nTyH/gRrTkEedSUgcl7k6wd3OiCkj6A=";
-          };
-
           # Configure to use system Chromium
           PLAYWRIGHT_CHROMIUM_PATH = "${pkgs.chromium}/bin/chromium";
           PLAYWRIGHT_SKIP_BROWSER_DOWNLOAD = "1";
 
           # Expose the built blog package, which we'll be testing
-          builtBlog = builtBlog;
-
-          # Optional but often needed in Nix sandboxes:
-          # XDG_CACHE_HOME = "$TMPDIR/xdg-cache";
-          # XDG_CONFIG_HOME = "$TMPDIR/xdg-config";
-          # XDG_DATA_HOME = "$TMPDIR/xdg-data";
+          blogWithRelativeLinks = blogWithRelativeLinks;
         };
       }
     );