[4.2] in updates XML always resulted in an error

[jgerman-bot]

New language relevant PR in upstream repo: joomla/joomla-cms#38121 Here are the upstream changes:

Click to expand the diff!

diff --git a/administrator/language/en-GB/lib_joomla.ini b/administrator/language/en-GB/lib_joomla.ini
index 178145886bce..e424927663bd 100644
--- a/administrator/language/en-GB/lib_joomla.ini
+++ b/administrator/language/en-GB/lib_joomla.ini
@@ -758,3 +758,11 @@ JLIB_SIZE_PB="PiB"
 JLIB_SIZE_EB="EiB"
 JLIB_SIZE_ZB="ZiB"
 JLIB_SIZE_YB="YiB"
+
+; Database server technology types in human readable terms. Used in the Updater package.
+JLIB_DB_SERVER_TYPE_MARIADB="MariaDB"
+JLIB_DB_SERVER_TYPE_MSSQL="Microsoft SQL Server"
+JLIB_DB_SERVER_TYPE_MYSQL="MySQL"
+JLIB_DB_SERVER_TYPE_ORACLE="Oracle"
+JLIB_DB_SERVER_TYPE_POSTGRESQL="PostgreSQL"
+JLIB_DB_SERVER_TYPE_SQLITE="SQLite"
diff --git a/libraries/src/Updater/Adapter/ExtensionAdapter.php b/libraries/src/Updater/Adapter/ExtensionAdapter.php
index 59740ab424bc..f84302bdafff 100644
--- a/libraries/src/Updater/Adapter/ExtensionAdapter.php
+++ b/libraries/src/Updater/Adapter/ExtensionAdapter.php
@@ -155,10 +155,13 @@ protected function _endElement($parser, $name)
 							}
 						}
 
+						// $supportedDbs has uppercase keys because they are XML attribute names
+						$dbTypeUcase = strtoupper($dbType);
+
 						// Do we have an entry for the database?
-						if (\array_key_exists($dbType, $supportedDbs))
+						if (\array_key_exists($dbTypeUcase, $supportedDbs))
 						{
-							$minimumVersion = $supportedDbs[$dbType];
+							$minimumVersion = $supportedDbs[$dbTypeUcase];
 							$dbMatch        = version_compare($dbVersion, $minimumVersion, '>=');
 
 							if (!$dbMatch)
@@ -168,7 +171,7 @@ protected function _endElement($parser, $name)
 									'JLIB_INSTALLER_AVAILABLE_UPDATE_DB_MINIMUM',
 									$this->currentUpdate->name,
 									$this->currentUpdate->version,
-									Text::_($db->name),
+									Text::_('JLIB_DB_SERVER_TYPE_' . $dbTypeUcase),
 									$dbVersion,
 									$minimumVersion
 								);
@@ -183,7 +186,7 @@ protected function _endElement($parser, $name)
 								'JLIB_INSTALLER_AVAILABLE_UPDATE_DB_TYPE',
 								$this->currentUpdate->name,
 								$this->currentUpdate->version,
-								Text::_($db->name)
+								Text::_('JLIB_DB_SERVER_TYPE_' . $dbTypeUcase)
 							);
 
 							Factory::getApplication()->enqueueMessage($dbMsg, 'warning');