Bug #77317 [Com]: __DIR__, __FILE__, realpath() reveal physical path for subst virtual drive

Edit report at https://bugs.php.net/bug.php?id=77317&edit=1 ID: 77317 Comment by: mtanalin at yandex dot ru Reported by: mtanalin at yandex dot ru Summary: __DIR__, __FILE__, realpath() reveal physical path for subst virtual drive Status: Closed Type: Bug Package: *Directory/Filesystem functions Operating System: Windows 10 PHP Version: 7.3.0 Assigned To: ab Block user comment: N Private report: N New Comment: The recent PHP 7.3.1 is still affected. When is the fix going to be applied to stable branch? Thanks. Previous Comments: ------------------------------------------------------------------------ [2018-12-26 12:07:50] ab@php.net Automatic comment on behalf of ab Revision: http://git.php.net/?p=php-src.git;a=commit;h=199914b42dccae1c87212dac988b14f57969652d Log: Fixed bug #77317 __DIR__, __FILE__, realpath() reveal physical path for subst virtual drive ------------------------------------------------------------------------ [2018-12-24 17:12:36] ab@php.net Thanks for the ping, Christoph. Yes, the intention was to move to a faster API. I think though, the reported behavior change needs to be fixed to comply with realpath(3) and earlier PHP. That would make the initial patch somewhat slower unfortunately. Perhaps this could be revisited in later PHP versions, by introducing a Windows specific routine or another way. I'll be working on a patch, otherwise we can also disable the quick path handling but keep the new internal realpath API. Thanks. ------------------------------------------------------------------------ [2018-12-21 22:57:13] cmb@php.net The behavioral change has been introduced with commit f3f6cd2[1]. It seems to me that this change is intentional. Anatol, if I'm right, please assign back to me, and I'll add a respective note to upgrading and the migration guide. [1] <http://git.php.net/?p=php-src.git;a=commit;h=f3f6cd24e9677c820f198f3804d6c9a932685373> ------------------------------------------------------------------------ [2018-12-18 19:51:13] mtanalin at yandex dot ru Description: ------------ __DIR__, __FILE__ and realpath() now reveal physical path for virtual drives created with subst under Windows. This is a breaking backward-incompatible change. The Windows’ built-in subst application maps a physical directory to a virtual drive and is used by Denwer for creating a virtual drive that web servers are virtually located on. Denwer is a WAMP kit popular in Russia. Documentation pages for __DIR__, __FILE__ and realpath() have no information about this change. PHP 7.2.12 works as expected: virtual-drive path is returned, physical path is not revealed. So either the behavior in PHP 7.3.x should be the same as in PHP 7.2.x (virtual-drive path returned, physical-drive path not revealed), or this breaking change should be documented. For example, in PHP 7.3.0 (with the latest Apache 2.4.37 [2018-11-21] from Apache Lounge): __DIR__: D:\_webservers\home\test-host __FILE__: D:\_webservers\home\test-host\test.php $_SERVER['DOCUMENT_ROOT']: Z:/home/test-host/www realpath($_SERVER['DOCUMENT_ROOT']): D:\_webservers\home\test-host\www While in PHP 7.2.12: __DIR__: Z:\home\test-host __FILE__: Z:\home\test-host\test.php $_SERVER['DOCUMENT_ROOT']: Z:/home/test-host/www realpath($_SERVER['DOCUMENT_ROOT']): Z:\home\test-host\www Test script: --------------- <?php echo __DIR__ . '<br>' . __FILE__ . '<br>' . $_SERVER['DOCUMENT_ROOT'] . '<br>' . realpath($_SERVER['DOCUMENT_ROOT']); ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=77317&edit=1