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Bug #78885 hash_file now shows a notice for directories and returns false
Submitted: 2019-11-29 10:57 UTC Modified: 2019-12-04 09:57 UTC
From: php-bugs at xpaw dot me Assigned: nikic (profile)
Status: Assigned Package: Filesystem function related
PHP Version: 7.4.0 OS: Linux
Private report: No CVE-ID: None
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 [2019-11-29 10:57 UTC] php-bugs at xpaw dot me 
Description:
------------
See https://3v4l.org/58RgW

Until 7.4.0beta1, it returned string(32) "d41d8cd98f00b204e9800998ecf8427e" and since 7.4.0beta2 it displays a notice.

Notice: hash_file(): read of 8192 bytes failed with errno=21 Is a directory in /in/58RgW on line 3

On Windows there is no notice, and it only returns false. I'm only creating this issue as I don't see anything in upgrading notes, deprecated features or the changelog about it.



Test script:
---------------
<?php
var_dump( hash_file( 'md5', '/etc/' ) );

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 [2019-11-29 12:34 UTC] cmb@php.net
-Package: hash +Package: Filesystem function related
 [2019-11-29 12:34 UTC] cmb@php.net 
This is not particularly related to hash_file(), but also affects
other filesystem functions, see <https://3v4l.org/5XQB3>.  IIRC,
that was a very deliberate change/fix.
 [2019-11-29 14:05 UTC] cmb@php.net
-Assigned To: +Assigned To: nikic
 [2019-11-29 14:05 UTC] cmb@php.net 
Well, the behavioral change has been introduced with commit
1cbcf0f[1]; not sure whether this particular behavior has been
anticipated.  If so, PR #4474[2] appears to be superfluous now.

[1] <http://git.php.net/?p=php-src.git;a=commit;h=1cbcf0f4f1e9a14b3fc76f6d3e53b567a9464fd4>
[2] <https://github.com/php/php-src/pull/4474>
 [2019-12-04 09:57 UTC] nikic@php.net 
This is intentional. PR #4474 is also still relevant, because it is a change specific to includes (not normal file reads).

UPGRADING currently only mentions this change for fread() and fwrite() in particular, but of course it also affects many, many other filesystem functions that read/write internally. I don't think we want to exhaustively list everything that might be affected.
 
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