fix: media usage check fails closed on database errors; refused deletes checked for partial state

MediaUsageFinder treats a failed query (null result or last_error) as a possible usage and an incomplete scan, so media-delete refuses without force. A refused wp_delete_attachment() is write_failed only when the attachment is intact, otherwise partial_write. media-update: re-read hint on write_failed, normalized ids in failures, documented lock resolution and kses on restore. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01At3V6SjwbMe6eMzVGW3Hs7
2026-09-26 02:54:37 +02:00
parent 931ddeb137
commit 7f136f6f4c
10 changed files with 238 additions and 20 deletions
@@ -316,4 +316,63 @@ final class MediaUsageFinderTest extends TestCase
        self::assertStringNotContainsString('foto', $this->queries[1]);
        self::assertStringNotContainsString("'%/%'", $this->queries[1]);
    }
+
+    /**
+     * A finder whose query $failing (SQL fragment) fails – returns null or sets last_error.
+     */
+    private function failingFinder(string $failing, bool $viaLastError): MediaUsageFinder
+    {
+        Functions\when('get_post_meta')->justReturn('2026/09/foto.jpg');
+        Functions\when('get_option')->justReturn(false);
+        Functions\when('get_theme_mod')->justReturn(false);
+
+        /** @var MockInterface&\wpdb $db */
+        $db = Mockery::mock(\wpdb::class)->makePartial();
+        $db->allows('get_results')->andReturnUsing(static function (string $sql) use ($db, $failing, $viaLastError) {
+            if (! str_contains($sql, $failing)) {
+                return [];
+            }
+            if ($viaLastError) {
+                $db->last_error = 'Lost connection to MySQL server';
+
+                return [];
+            }
+
+            return null;
+        });
+
+        return new MediaUsageFinder(static fn (): array => ['photo'], $db);
+    }
+
+    /** @return mixed Result of $run with error_log() redirected (a PHP internal, not stubbable). */
+    private static function quietly(callable $run): mixed
+    {
+        $file = (string) tempnam(sys_get_temp_dir(), 'lit-mcp-log');
+        $previous = ini_set('error_log', $file);
+        try {
+            return $run();
+        } finally {
+            ini_set('error_log', (string) $previous);
+            unlink($file);
+        }
+    }
+
+    public function testAFailedQueryNeverReportsUnused(): void
+    {
+        foreach (['_thumbnail_id', 'pm.meta_key IN', 'post_content LIKE'] as $failing) {
+            foreach ([true, false] as $viaLastError) {
+                $label = $failing . ($viaLastError ? ' (last_error)' : ' (null)');
+
+                self::assertTrue(self::quietly(fn () => $this->failingFinder($failing, $viaLastError)->isUsed(33)), $label);
+
+                $scan = self::quietly(fn () => $this->failingFinder($failing, $viaLastError)->scan(33));
+                self::assertFalse($scan['complete'], $label);
+                self::assertSame(
+                    [['post_id' => 0, 'title' => MediaUsageFinder::FAILED_TITLE, 'post_type' => 'check', 'where' => 'unknown', 'certainty' => 'möglicherweise']],
+                    $scan['usages'],
+                    $label
+                );
+            }
+        }
+    }
 }