Improve UX and messaging for certain errors when landing revisions

Summary:
Ref T9994.

  - Allow errors to be dismissed.
  - Tailor messaging for closed/abandoned revisions.
  - Reduce scare messaging on land dialog, since it's not really that scary anymore.

Test Plan:
  - Dismissed errors.
  - Hit new warnings.
  - Wasn't as scared when landing.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T9994

Differential Revision: https://secure.phabricator.com/D14886

src/applications/drydock/controller/DrydockRepositoryOperationDismissController.php

@@ -0,0 +1,56 @@
+<?php
+
+final class DrydockRepositoryOperationDismissController
+  extends DrydockController {
+
+  public function handleRequest(AphrontRequest $request) {
+    $viewer = $request->getViewer();
+    $id = $request->getURIData('id');
+
+    $operation = id(new DrydockRepositoryOperationQuery())
+      ->setViewer($viewer)
+      ->withIDs(array($id))
+      ->requireCapabilities(
+        array(
+          PhabricatorPolicyCapability::CAN_VIEW,
+          PhabricatorPolicyCapability::CAN_EDIT,
+        ))
+      ->executeOne();
+    if (!$operation) {
+      return new Aphront404Response();
+    }
+
+    $object_phid = $operation->getObjectPHID();
+    $handles = $viewer->loadHandles(array($object_phid));
+    $done_uri = $handles[$object_phid]->getURI();
+
+    if ($operation->getIsDismissed()) {
+      return $this->newDialog()
+        ->setTitle(pht('Already Dismissed'))
+        ->appendParagraph(
+          pht(
+            'This operation has already been dismissed, and can not be '.
+            'dismissed any further.'))
+        ->addCancelButton($done_uri);
+    }
+
+
+    if ($request->isFormPost()) {
+      $operation
+        ->setIsDismissed(1)
+        ->save();
+
+      return id(new AphrontRedirectResponse())->setURI($done_uri);
+    }
+
+    return $this->newDialog()
+      ->setTitle(pht('Dismiss Operation'))
+      ->appendParagraph(
+        pht(
+          'Dismiss this operation? It will no longer be shown, but logs '.
+          'can be found in Drydock.'))
+      ->addSubmitButton(pht('Dismiss'))
+      ->addCancelButton($done_uri);
+  }
+
+}