Test if network is available

default.nix

@@ -3,7 +3,16 @@
   system ? builtins.currentSystem,
   pkgs ?
     import sources.nixpkgs {
-      overlays = [];
+      overlays = [
+        (final: previous: {
+          defaultGemConfig = previous.defaultGemConfig // {
+            jekyll-github-metadata = attrs: {
+              dontBuild = false;
+              patches = [./test.patch];
+            };
+          };
+        })
+      ];
       config = {};
       inherit system;
     },

test.patch

@@ -0,0 +1,20 @@
+diff --git a/lib/jekyll-github-metadata/client.rb b/lib/jekyll-github-metadata/client.rb
+index f655152..6be3d4c 100644
+--- a/lib/jekyll-github-metadata/client.rb
++++ b/lib/jekyll-github-metadata/client.rb
+@@ -108,6 +108,7 @@ module Jekyll
+       end
+
+       def internet_connected?
++        GitHubMetadata.log :warn, " ----------- checking for an internet connection #{@internet_connected}"
+         return @internet_connected if defined?(@internet_connected)
+
+         require "resolv"
+@@ -120,6 +121,7 @@ module Jekyll
+         rescue Resolv::ResolvError
+           @internet_connected = false
+         end
++        GitHubMetadata.log :warn, " ----------- checked for an internet connection #{@internet_connected}"
+       end
+
+       private