From 9b8104ce9bd655c544d0cfe0330e8f86ae0a4e04 Mon Sep 17 00:00:00 2001
From: Simey Lameze <simey@moodle.com>
Date: Fri, 10 Apr 2015 10:30:09 +0800
Subject: [PATCH] MDL-46963 environment: add check for antelope row format

---
 admin/environment.xml |  5 +++++
 lang/en/admin.php     |  1 +
 lib/upgradelib.php    | 32 ++++++++++++++++++++++++++++++++
 3 files changed, 38 insertions(+)

diff --git a/admin/environment.xml b/admin/environment.xml
index ede697b6721..e596403a79d 100644
--- a/admin/environment.xml
+++ b/admin/environment.xml
@@ -1390,6 +1390,11 @@
           <ON_CHECK message="slashargumentswarning" />
         </FEEDBACK>
       </CUSTOM_CHECK>
+      <CUSTOM_CHECK file="lib/upgradelib.php" function="check_database_tables_row_format" level="optional">
+        <FEEDBACK>
+          <ON_CHECK message="unsupporteddbtablerowformat" />
+        </FEEDBACK>
+      </CUSTOM_CHECK>
     </CUSTOM_CHECKS>
   </MOODLE>
 </COMPATIBILITY_MATRIX>
diff --git a/lang/en/admin.php b/lang/en/admin.php
index dd15350c02a..0a2f2e919ef 100644
--- a/lang/en/admin.php
+++ b/lang/en/admin.php
@@ -1070,6 +1070,7 @@ $string['unlockaccount'] = 'Unlock account';
 $string['unsettheme'] = 'Unset theme';
 $string['unsupported'] = 'Unsupported';
 $string['unsupporteddbstorageengine'] = 'The database storage engine being used is no longer supported.';
+$string['unsupporteddbtablerowformat'] = 'Your database has tables using Antelope as the file format. You are recommended to convert the tables to the Barracuda file format. See the documentation <a href="https://docs.moodle.org/en/cli">Administration via command line</a> for details of a tool for converting InnoDB tables to Barracuda.';
 $string['unsuspenduser'] = 'Activate user account';
 $string['updateaccounts'] = 'Update existing accounts';
 $string['updatecomponent'] = 'Update component';
diff --git a/lib/upgradelib.php b/lib/upgradelib.php
index 9cd41a018a4..272851a3e0f 100644
--- a/lib/upgradelib.php
+++ b/lib/upgradelib.php
@@ -2245,3 +2245,35 @@ function check_slasharguments(environment_results $result){
 
     return null;
 }
+
+/**
+ * This function verifies if the database has tables using innoDB Antelope row format.
+ *
+ * @param environment_results $result
+ * @return environment_results|null updated results object, or null if no Antelope table has been found.
+ */
+function check_database_tables_row_format(environment_results $result) {
+    global $DB;
+
+    if ($DB->get_dbfamily() == 'mysql') {
+        $generator = $DB->get_manager()->generator;
+
+        foreach ($DB->get_tables(false) as $table) {
+            $columns = $DB->get_columns($table, false);
+            $size = $generator->guess_antolope_row_size($columns);
+            $format = $DB->get_row_format($table);
+
+            if ($size <= $generator::ANTELOPE_MAX_ROW_SIZE) {
+                continue;
+            }
+
+            if ($format === 'Compact' or $format === 'Redundant') {
+                $result->setInfo('unsupported_db_table_row_format');
+                $result->setStatus(false);
+                return $result;
+            }
+        }
+    }
+
+    return null;
+}