Show host information on setup issue screen

Summary: Ref T3780. Facebook has some environmental / itermittent stuff which would be easier to debug with host information on the setup issue screen.

Test Plan:
Checked both in-chrome and out-of-chrome versions of this screen, both looked reasonable.

{F56694}

Reviewers: wez, btrahan

Reviewed By: btrahan

CC: chad, aran

Maniphest Tasks: T3780

Differential Revision: https://secure.phabricator.com/D6842

src/applications/config/view/PhabricatorSetupIssueView.php

@@ -116,7 +116,7 @@ final class PhabricatorSetupIssueView extends AphrontView {
       ),
       $issue->getName());
 
-    return phutil_tag(
+    $issue = phutil_tag(
       'div',
       array(
         'class' => 'setup-issue',
@@ -126,6 +126,23 @@ final class PhabricatorSetupIssueView extends AphrontView {
         $description,
         $next,
       ));
+
+    $debug_info = phutil_tag(
+      'div',
+      array(
+        'class' => 'setup-issue-debug',
+      ),
+      pht('Host: %s', php_uname('n')));
+
+    return phutil_tag(
+      'div',
+      array(
+        'class' => 'setup-issue-shell',
+      ),
+      array(
+        $issue,
+        $debug_info,
+      ));
   }
 
   private function renderPhabricatorConfig(array $configs, $related = false) {

webroot/rsrc/css/application/config/setup-issue.css

@@ -8,10 +8,14 @@
   padding: 1em 0;
 }
 
+.setup-issue-shell {
+  max-width: 760px;
+  margin: 15px auto;
+}
+
+
 .setup-issue {
   border: 1px solid #35393d;
-  margin: 15px auto;
-  max-width: 760px;
   background: #ffffff;
   box-shadow: 1px 2px 2px rgba(0, 0, 0, 0.25);
 }
@@ -95,3 +99,10 @@
   margin: 1em auto;
   list-style: circle;
 }
+
+.setup-issue-debug {
+  margin-top: 8px;
+  padding: 4px;
+  text-align: right;
+  color: #666666;
+}