DP-16759: Resolve issue with cache tags not being cleared at end of r…

…elease (#43)

* DP-16759: Downgrade Drush to 9 (#41)

* DP-16759: Downgrade Drush to 9

* Resolve PHPCS warning that came out of nowhere

* Backport cache:tags command for temporary use

* Add changelog

* Move to a class without a validation handler

* Extend DrushCommands

changelogs/DP-16759-2.yml

@@ -0,0 +1,33 @@
+  # Write your changelog entry here.  Every PR must have a changelog.
+  #
+  # You can use the following types:
+  #   Added: For new features.
+  #   Changed: For changes to existing functionality.
+  #   Deprecated: For soon-to-be removed features.
+  #   Removed: For removed features.
+  #   Fixed: For any bug fixes.
+  #   Security: In case of vulnerabilities.
+  #
+  # The format is crucial. Please follow the examples below exactly. For reference, the requirements are:
+  # * All 3 parts are required: you must include type, description, and issue.
+  # * Type must be left aligned and followed by a colon.
+  # * Description must be indented 2 spaces.
+  # * Issue must be indented 4 spaces.
+  # * Issue should include just the Jira ticket number, not a URL.
+  # * No extra spaces, indents, or blank lines are allowed.
+  #
+  # Fixed:
+  #  - description: Fixes scrolling on edit pages in Safari.
+  #    issue: DP-13314
+  #
+  # You may add more than 1 description & issue for each type. Use the following format:
+  # Changed:
+  #  - description: Automating the release branch.
+  #    issue: DP-10166
+  #  - description: Second change item that needs a description.
+  #    issue: DP-19875
+  #  - description: Third change item that needs a description along with an issue.
+  #    issue: DP-19843
+Fixed:
+  - description: ma:deploy erroring during cache clearing
+    issue: DP-16759

changelogs/DP-16759.yml

@@ -0,0 +1,33 @@
+  # Write your changelog entry here.  Every PR must have a changelog.
+  #
+  # You can use the following types:
+  #   Added: For new features.
+  #   Changed: For changes to existing functionality.
+  #   Deprecated: For soon-to-be removed features.
+  #   Removed: For removed features.
+  #   Fixed: For any bug fixes.
+  #   Security: In case of vulnerabilities.
+  #
+  # The format is crucial. Please follow the examples below exactly. For reference, the requirements are:
+  # * All 3 parts are required: you must include type, description, and issue.
+  # * Type must be left aligned and followed by a colon.
+  # * Description must be indented 2 spaces.
+  # * Issue must be indented 4 spaces.
+  # * Issue should include just the Jira ticket number, not a URL.
+  # * No extra spaces, indents, or blank lines are allowed.
+  #
+  # Fixed:
+  #  - description: Fixes scrolling on edit pages in Safari.
+  #    issue: DP-13314
+  #
+  # You may add more than 1 description & issue for each type. Use the following format:
+  # Changed:
+  #  - description: Automating the release branch.
+  #    issue: DP-10166
+  #  - description: Second change item that needs a description.
+  #    issue: DP-19875
+  #  - description: Third change item that needs a description along with an issue.
+  #    issue: DP-19843
+Fixed:
+  - description: Downgrade Drush to fix sitemap and massdocs cron tasks.
+    issue: DP-16759

drush/Commands/CacheBackportCommands.php

@@ -0,0 +1,30 @@
+<?php
+
+namespace Drush\Commands;
+
+use Drupal\Core\Cache\Cache;
+use Drush\Utils\StringUtils;
+
+class CacheBackportCommands extends DrushCommands {
+
+  /**
+   * Invalidate by cache tags.
+   *
+   * Note: This is a temporary backport of a Drush 10 feature.
+   * Remove when we go to Drush 10.
+   *
+   * @command cache:tags
+   * @param string $tags A comma delimited list of cache tags to clear.
+   * @aliases ct
+   * @bootstrap full
+   * @usage drush cache:tag node:12,user:4
+   *   Purge content associated with two cache tags.
+   */
+  public function tags($tags)
+  {
+    $tags = StringUtils::csvToArray($tags);
+    Cache::invalidateTags($tags);
+    $this->logger()->success(dt("Invalidated tag(s): !list.", ['!list' => implode(' ', $tags)]));
+  }
+
+}

drush/Commands/DeployCommands.php

@@ -6,9 +6,11 @@
 use Consolidation\AnnotatedCommand\CommandData;
 use Consolidation\SiteAlias\SiteAliasManagerAwareTrait;
 use Consolidation\SiteProcess\Util\Shell;
+use Drupal\Core\Cache\Cache;
 use Drush\Drush;
 use Drush\Exceptions\UserAbortException;
 use Drush\SiteAlias\SiteAliasManagerAwareInterface;
+use Drush\Utils\StringUtils;
 use Webmozart\PathUtil\Path;
 
 /**