Do not stop directory listing when ACL is blocking access

[juliushaertl]

When iterating over the files in a directory of an SMB share the the directory the iterable would stop after the first ACL that denies access instead of just hiding those entries. This may lead to incomplete directory listings on SMB shares with the ACL check enabled.

[MorrisJobke]

@juliushaertl Backport?

[juliushaertl]

/backport to stable21

[juliushaertl]

/backport to stable20

[juliushaertl]

/backport to stable19

[DD-githu]

Hi! So im on the 21.0.3 docker version, this fix was backported to - still having the issue with local-mounted external folders:
Running: docker exec --user www-data nc_dd_app_1 php occ files:scan --path="/Dominik/files/nas_Setups/Tools"
still getting a Permission denied exception:

Exception during scan: opendir(/mnt/nas_Setups/Tools/@eaDir): failed to open dir: Permission denied
#0 [internal function]: OCA\Files\Command\Scan->exceptionErrorHandler(2, 'opendir(/mnt/na...', '/var/www/html/l...', 135, Array)
#1 /var/www/html/lib/private/Files/Storage/Local.php(135): opendir('/mnt/nas_Setups...')
#2 /var/www/html/lib/private/Files/Storage/Common.php(878): OC\Files\Storage\Local->opendir('Tools/@eaDir')
#3 /var/www/html/lib/private/Files/Storage/Wrapper/PermissionsMask.php(158): OC\Files\Storage\Common->getDirectoryContent('Tools/@eaDir')
#4 [internal function]: OC\Files\Storage\Wrapper\PermissionsMask->getDirectoryContent('Tools/@eaDir')
#5 /var/www/html/lib/private/Files/Cache/Scanner.php(409): iterator_to_array(Object(Generator))
#6 /var/www/html/lib/private/Files/Cache/Scanner.php(389): OC\Files\Cache\Scanner->handleChildren('Tools/@eaDir', true, 3, 1046216, true, 0)
#7 /var/www/html/lib/private/Files/Cache/Scanner.php(392): OC\Files\Cache\Scanner->scanChildren('Tools/@eaDir', true, 3, 1046216, true)
#8 /var/www/html/lib/private/Files/Cache/Scanner.php(341): OC\Files\Cache\Scanner->scanChildren('Tools', true, 3, 864151, true)
#9 /var/www/html/lib/private/Files/Utils/Scanner.php(260): OC\Files\Cache\Scanner->scan('Tools', true, 3)
#10 /var/www/html/apps/files/lib/Command/Scan.php(158): OC\Files\Utils\Scanner->scan('/Dominik/files/...', true, NULL)
#11 /var/www/html/apps/files/lib/Command/Scan.php(214): OCA\Files\Command\Scan->scanFiles('Dominik', '/Dominik/files/...', Object(Symfony\Component\Console\Output\ConsoleOutput), false, true, false)
#12 /var/www/html/3rdparty/symfony/console/Command/Command.php(255): OCA\Files\Command\Scan->execute(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#13 /var/www/html/core/Command/Base.php(169): Symfony\Component\Console\Command\Command->run(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#14 /var/www/html/3rdparty/symfony/console/Application.php(1009): OC\Core\Command\Base->run(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#15 /var/www/html/3rdparty/symfony/console/Application.php(273): Symfony\Component\Console\Application->doRunCommand(Object(OCA\Files\Command\Scan), Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#16 /var/www/html/3rdparty/symfony/console/Application.php(149): Symfony\Component\Console\Application->doRun(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#17 /var/www/html/lib/private/Console/Application.php(215): Symfony\Component\Console\Application->run(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#18 /var/www/html/console.php(100): OC\Console\Application->run()
#19 /var/www/html/occ(11): require_once('/var/www/html/c...')
#20 {main}

ACL for the folder is user:nextcloud_docker:deny:rwxpdDaARWcCo:fd-- (level:0)

[juliushaertl]

Does not seem related to this PR as this one is about mounted SMB storage through external storages and you are using a local folder, so please open a new issue about that.