Fixes #915: Sync drushrc.php with template drushrc.php via update hook.

src/Update/Updater.php

@@ -10,6 +10,7 @@
 use Symfony\Component\Console\Helper\FormatterHelper;
 use Symfony\Component\Console\Output\ConsoleOutput;
 use Symfony\Component\Filesystem\Exception\FileNotFoundException;
+use Symfony\Component\Filesystem\Exception\IOException;
 use Symfony\Component\Filesystem\Filesystem;
 use Symfony\Component\Process\Process;
 use Symfony\Component\Yaml\Yaml;
@@ -478,6 +479,27 @@ public function moveFile($source, $target, $overwrite = FALSE) {
     return FALSE;
   }
 
+  /**
+   * Copies a file from the BLT template to the repository.
+   *
+   * @param string $source
+   *   The filepath, relative to the BLT template directory.
+   */
+  public function syncWithTemplate($filePath, $overwrite = FALSE) {
+    $sourcePath = $this->getBltRoot() . '/template/' . $filePath;
+    $targetPath = $this->getRepoRoot() . '/' . $filePath;
+
+    if ($this->getFileSystem()->exists($sourcePath)) {
+      try {
+        $this->getFileSystem()->copy($sourcePath, $targetPath, $overwrite);
+      }
+      catch (IOException $e) {
+        throw $e;
+      }
+    }
+
+  }
+
   /**
    * Performs a find and replace in a text file.
    *

src/Update/Updates.php

@@ -278,5 +278,9 @@ public function update_8007000() {
     $this->updater->getOutput()->writeln($formattedBlock);
     $this->updater->getOutput()->writeln("");
     $this->updater->getOutput()->writeln("<comment>Please execute `composer update` to incorporate these final automated changes to composer.json.</comment>");
+
+    // Sync updates to drushrc.php manually since it has been added to ignore-existing.txt.
+    $drushrcFile = 'drush/drushrc.php';
+    $this->updater->syncWithTemplate($drushrcFile, TRUE);
   }
 }