MAGETWO-62567: Make static file versioning number not based on timestamp

Author: Alex Paliarush

app/code/Magento/Deploy/Console/DeployStaticOptions.php

@@ -126,6 +126,11 @@ class DeployStaticOptions
      */
     const LANGUAGES_ARGUMENT = 'languages';
 
+    /**
+     * Static content version
+     */
+    const CONTENT_VERSION = 'content-version';
+
     /**
      * Deploy static command options list
      *
@@ -211,7 +216,14 @@ private function getBasicOptions()
                 null,
                 InputOption::VALUE_NONE,
                 'Create symlinks for the files of those locales, which are passed for deployment, '
-                . 'but have no customizations'
+                . 'but have no customizations.'
+            ),
+            new InputOption(
+                self::CONTENT_VERSION,
+                null,
+                InputArgument::OPTIONAL,
+                'Custom version of static content can be used if running deployment on multiple nodes '
+                . 'to ensure that static content version is identical and caching works properly.'
             ),
             new InputArgument(
                 self::LANGUAGES_ARGUMENT,

app/code/Magento/Deploy/Service/DeployStaticContent.php

@@ -96,7 +96,9 @@ public function deploy(array $options)
             ]
         );
 
-        $version = (new \DateTime())->getTimestamp();
+        $version = !empty($options[Options::CONTENT_VERSION]) && is_string($options[Options::CONTENT_VERSION])
+            ? $options[Options::CONTENT_VERSION]
+            : (new \DateTime())->getTimestamp();
         $this->versionStorage->save($version);
 
         $packages = $deployStrategy->deploy($options);