Display last GitHub status message if cloning fails

lib/travis/build/git/clone.rb

@@ -1,4 +1,5 @@
 require 'shellwords'
+require 'uri'
 
 module Travis
   module Build
@@ -18,6 +19,13 @@ def apply
           def clone_or_fetch
             sh.if "! -d #{dir}/.git" do
               sh.cmd "git clone #{clone_args} #{data.source_url} #{dir}", assert: true, retry: true
+              if github?
+                sh.if "$? -ne 0" do
+                  sh.echo "Failed to clone from GitHub.", ansi: :red
+                  sh.echo "Checking GitHub status (https://status.github.com/api/last-message.json):"
+                  sh.raw "curl -sL https://status.github.com/api/last-message.json | jq -r .[]"
+                end
+              end
             end
             sh.else do
               sh.cmd "git -C #{dir} fetch origin", assert: true, retry: true
@@ -63,6 +71,16 @@ def dir
           def config
             data.config
           end
+
+          def github?
+            if md = /[^@]+@(.*):/.match(data.source_url)
+              # we will assume that the URL looks like one for git+ssh; e.g., git@github.com:travis-ci/travis-build.git
+              host = md[1]
+            else
+              host = URI.parse(data.source_url).host.downcase
+            end
+            host == 'github.com' || host.end_with?('.gh.neting.cc')
+          end
       end
     end
   end

spec/build/script/node_js_spec.rb

@@ -26,7 +26,7 @@
       end
 
       context 'when nvm install fails' do
-        let(:sexp_if)      { sexp_filter(subject, [:if, '$? -ne 0'], [:then]) }
+        let(:sexp_if)      { sexp_filter(subject, [:if, '$? -ne 0'])[1] }
 
         it 'tries to use locally available version' do
           expect(sexp_if).to include_sexp [:cmd, 'nvm use 0.9', echo: true]