Bug #80660 [Com]: FilesystemIterator foreach-loop fails on fuse filesystems

Edit report at https://bugs.php.net/bug.php?id=80660&edit=1 ID: 80660 Comment by: staffan at njoy dot fi Reported by: shop1 at mokraemer dot de Summary: FilesystemIterator foreach-loop fails on fuse filesystems Status: Open Type: Bug Package: *Directory/Filesystem functions Operating System: linux PHP Version: 7.4.14 Block user comment: N Private report: N New Comment: I think this is what I'm seeing in docker on windows, I'm using the php:7-fpm-alpine image and it's currently at 7.4.30. I'm only seeing it if the directory that's being scanned has more than about 50 entries though. It puzzled me greatly why Drupal would fail to identify its modules if the modules directory had a lot of modules but be fine if I moved them around so that no modules directory had more than that. I've only seen this when the modules were on a bind mounted volume. Previous Comments: ------------------------------------------------------------------------ [2021-04-30 02:19:18] marcelo at ofload dot com I'm having a similar issue. In your example, if you don't rewind() it works. i.e. - create the iterator - while() - foreach() But I can also see an issue where if you rewind() before while() it fails. i.e. - create the iterator - rewind() - while() Also, if we do foreach() before while() it fails: i.e. - create the iterator - foreach() - rewind() - while() In summary, depending if you call rewind() or not calling rewind() it fails for foreach() or while() too. This is a very awkward bug that is happening in a Docker container with Windows as a Host. ------------------------------------------------------------------------ [2021-01-22 13:53:36] shop1 at mokraemer dot de Description: ------------ As for my testing, FilesystemIterator fails with the foreach loop while the while-next loop works as expected. Test script: --------------- <?php $iterator = new \FilesystemIterator( '/fuse-filesystem', \FilesystemIterator::CURRENT_AS_SELF | \FilesystemIterator::SKIP_DOTS ); echo "--while\n"; while($iterator->valid()) { echo $iterator->current()."\n"; $iterator->next(); } $iterator->rewind(); echo "--for\n"; foreach ($iterator as $entry) { echo $entry->getFilename()."\n"; } Expected result: ---------------- --while .hg file1.class.php file2.class.php --for .hg file1.class.php file2.class.php Actual result: -------------- --while .hg file1.class.php file2.class.php --for ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=80660&edit=1