From 41019a83628224ffe49f782688c81b889587b2b5 Mon Sep 17 00:00:00 2001
From: Dries Buytaert <dries@buytaert.net>
Date: Wed, 10 Feb 2010 20:22:57 +0000
Subject: - Patch #708574 by jhodgdon: hook_archiver_info_alter() was not
 documented.

---
 includes/common.inc           |  5 ++++-
 modules/system/system.api.php | 14 ++++++++++++++
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/includes/common.inc b/includes/common.inc
index 05d7d5b73..39796bbd4 100644
--- a/includes/common.inc
+++ b/includes/common.inc
@@ -6618,7 +6618,10 @@ function xmlrpc($url) {
 }
 
 /**
- * Retrieve a list of all available archivers.
+ * Retrieves a list of all available archivers.
+ *
+ * @see hook_archiver_info()
+ * @see hook_archiver_info_alter()
  */
 function archiver_get_info() {
   $archiver_info = &drupal_static(__FUNCTION__, array());
diff --git a/modules/system/system.api.php b/modules/system/system.api.php
index da9058d23..8ebf9d6c0 100644
--- a/modules/system/system.api.php
+++ b/modules/system/system.api.php
@@ -2741,6 +2741,8 @@ function hook_action_info_alter(&$actions) {
  * - weight: This optional key specifies the weight of this archiver.
  *   When mapping file extensions to archivers, the first archiver by
  *   weight found that supports the requested extension will be used.
+ *
+ * @see hook_archiver_info_alter()
  */
 function hook_archiver_info() {
   return array(
@@ -2751,6 +2753,18 @@ function hook_archiver_info() {
   );
 }
 
+/**
+ * Alter archiver information declared by other modules.
+ *
+ * See hook_archiver_info() for a description of archivers and the archiver
+ * information structure.
+ *
+ * @param $info
+ *   Archiver information to alter (return values from hook_archiver_info()).
+ */
+function hook_archiver_info_alter(&$info) {
+  $info['tar']['extensions'][] = 'tgz';
+}
 
 /**
  * Defines additional date types.
-- 
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