Split setup checks into "preflight" and "normal" checks

Summary:
Ref T11589. Currently, initialization order is a bit tangled: we load configuration from the database, then later test if we can connect to the database.

Instead, I'm going to do: preflight checks ("PHP Version OK?", "Extensions installed?"), then configuration, then normal setup checks.

To prepare for this, flag core checks as "preflight" and add a setup panel to visually confirm that I didn't miss anything.

Test Plan: {F1803210}

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T11589

Differential Revision: https://secure.phabricator.com/D16499

src/__phutil_library_map__.php

@@ -2200,6 +2200,7 @@ phutil_register_library_map(array(
     'PhabricatorConfigSchemaQuery' => 'applications/config/schema/PhabricatorConfigSchemaQuery.php',
     'PhabricatorConfigSchemaSpec' => 'applications/config/schema/PhabricatorConfigSchemaSpec.php',
     'PhabricatorConfigServerSchema' => 'applications/config/schema/PhabricatorConfigServerSchema.php',
+    'PhabricatorConfigSetupCheckModule' => 'applications/config/module/PhabricatorConfigSetupCheckModule.php',
     'PhabricatorConfigSiteModule' => 'applications/config/module/PhabricatorConfigSiteModule.php',
     'PhabricatorConfigSiteSource' => 'infrastructure/env/PhabricatorConfigSiteSource.php',
     'PhabricatorConfigSource' => 'infrastructure/env/PhabricatorConfigSource.php',
@@ -6953,6 +6954,7 @@ phutil_register_library_map(array(
     'PhabricatorConfigSchemaQuery' => 'Phobject',
     'PhabricatorConfigSchemaSpec' => 'Phobject',
     'PhabricatorConfigServerSchema' => 'PhabricatorConfigStorageSchema',
+    'PhabricatorConfigSetupCheckModule' => 'PhabricatorConfigModule',
     'PhabricatorConfigSiteModule' => 'PhabricatorConfigModule',
     'PhabricatorConfigSiteSource' => 'PhabricatorConfigProxySource',
     'PhabricatorConfigSource' => 'Phobject',

src/applications/config/check/PhabricatorDatabaseSetupCheck.php

@@ -8,7 +8,7 @@ final class PhabricatorDatabaseSetupCheck extends PhabricatorSetupCheck {
 
   public function getExecutionOrder() {
     // This must run after basic PHP checks, but before most other checks.
-    return 0.5;
+    return 500;
   }
 
   protected function executeChecks() {

src/applications/config/check/PhabricatorExtensionsSetupCheck.php

@@ -6,8 +6,8 @@ final class PhabricatorExtensionsSetupCheck extends PhabricatorSetupCheck {
     return self::GROUP_PHP;
   }
 
-  public function getExecutionOrder() {
-    return 0;
+  public function isPreflightCheck() {
+    return true;
   }
 
   protected function executeChecks() {

src/applications/config/check/PhabricatorPHPConfigSetupCheck.php

@@ -6,8 +6,8 @@ final class PhabricatorPHPConfigSetupCheck extends PhabricatorSetupCheck {
     return self::GROUP_PHP;
   }
 
-  public function getExecutionOrder() {
-    return 0;
+  public function isPreflightCheck() {
+    return true;
   }
 
   protected function executeChecks() {

src/applications/config/check/PhabricatorSetupCheck.php

@@ -12,7 +12,25 @@ abstract class PhabricatorSetupCheck extends Phobject {
   const GROUP_IMPORTANT   = 'important';
 
   public function getExecutionOrder() {
-    return 1;
+    if ($this->isPreflightCheck()) {
+      return 0;
+    } else {
+      return 1000;
+    }
+  }
+
+  /**
+   * Should this check execute before we load configuration?
+   *
+   * The majority of checks (particularly, those checks which examine
+   * configuration) should run in the normal setup phase, after configuration
+   * loads. However, a small set of critical checks (mostly, tests for PHP
+   * setup and extensions) need to run before we can load configuration.
+   *
+   * @return bool True to execute before configuration is loaded.
+   */
+  public function isPreflightCheck() {
+    return false;
   }
 
   final protected function newIssue($key) {

src/applications/config/module/PhabricatorConfigSetupCheckModule.php

@@ -0,0 +1,49 @@
+<?php
+
+final class PhabricatorConfigSetupCheckModule
+  extends PhabricatorConfigModule {
+
+  public function getModuleKey() {
+    return 'setup';
+  }
+
+  public function getModuleName() {
+    return pht('Setup Checks');
+  }
+
+  public function renderModuleStatus(AphrontRequest $request) {
+    $viewer = $request->getViewer();
+
+    $checks = PhabricatorSetupCheck::loadAllChecks();
+
+    $rows = array();
+    foreach ($checks as $key => $check) {
+      if ($check->isPreflightCheck()) {
+        $icon = id(new PHUIIconView())->setIcon('fa-plane blue');
+      } else {
+        $icon = id(new PHUIIconView())->setIcon('fa-times grey');
+      }
+
+      $rows[] = array(
+        $check->getExecutionOrder(),
+        $icon,
+        get_class($check),
+      );
+    }
+
+    return id(new AphrontTableView($rows))
+      ->setHeaders(
+        array(
+          pht('Order'),
+          pht('Preflight'),
+          pht('Class'),
+        ))
+      ->setColumnClasses(
+        array(
+          null,
+          null,
+          'pri wide',
+        ));
+  }
+
+}