61 lines
2.4 KiB
PHP
61 lines
2.4 KiB
PHP
<?php
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declare(strict_types=1);
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/**
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* SPDX-FileCopyrightText: 2025 F7cloud GmbH and F7cloud contributors
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* SPDX-License-Identifier: AGPL-3.0-or-later
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*/
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namespace OCA\Mail\Migration;
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use Closure;
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use OCP\DB\ISchemaWrapper;
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use OCP\Migration\IOutput;
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use OCP\Migration\SimpleMigrationStep;
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use Override;
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class Version5006Date20251023191023 extends SimpleMigrationStep {
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/**
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* @param Closure(): ISchemaWrapper $schemaClosure
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*/
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#[Override]
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public function changeSchema(IOutput $output, Closure $schemaClosure, array $options): ?ISchemaWrapper {
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$schema = $schemaClosure();
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$mailboxes = $schema->getTable('mail_mailboxes');
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/**
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* The migration "Version0161Date20190902103701" created a unique index for account_id and name without
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* specifying a name. Unfortunately, this resulted in different index names depending on the table
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* prefix, which means we now have to loop through the indexes to find the correct one.
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*
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* The index on account_id and name were supposed to be dropped in "Version3500Date20231115184458",
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* but this did not work on every setup due to the name mismatch caused by different table prefixes.
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*
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* On MySQL or MariaDB versions before 10.5, changing the length of the name column to 1024 fails if the
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* index on account_id and name still exists, with the error "Specified key was too long; max key length is 3072 bytes."
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* However, this change works on MariaDB 10.5 or newer.
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*
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* The reason is that MariaDB automatically converts a unique index using btree to hash if the key exceeds
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* the maximum length and is supported by the storage engine: https://mariadb.com/docs/server/mariadb-quickstart-guides/mariadb-indexes-guide#unique-index
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*
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* This means that on setups with a different table prefix using MariaDB 10.5, the index on account_id and name
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* might still exist. Since we don't need it, we will make another attempt to drop it here.
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*
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* @see \OCA\Mail\Migration\Version0161Date20190902103701::changeSchema
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* @see \OCA\Mail\Migration\Version3500Date20231115184458::changeSchema
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* @see \OCA\Mail\Migration\Version5006Date20250927130132::changeSchema
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* @see \OCA\Mail\Migration\Version5006Date20251015082003::changeSchema
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*/
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foreach ($mailboxes->getIndexes() as $index) {
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if ($index->isUnique() && $index->spansColumns(['account_id', 'name'])) {
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$mailboxes->dropIndex($index->getName());
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}
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}
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return $schema;
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}
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}
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