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Request #80527 Current directory deleted before shutdown_function - File functions affected
Submitted: 2020-12-17 14:30 UTC Modified: 2021-01-07 14:21 UTC
From: heavy-traffic-website at yopmail dot com Assigned: cmb (profile)
Status: Duplicate Package: *Directory/Filesystem functions
PHP Version: 8.0.0 OS: Debian 11
Private report: No CVE-ID: None
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 [2020-12-17 14:30 UTC] heavy-traffic-website at yopmail dot com 
Description:
------------
Files functions doesn't work with relative paths since the current working directory is deleted during the "exit" line. Is this a bug or a feature ? :-)

Test script:
---------------
function debug_cwd(int $i)
{
    syslog(LOG_DEBUG, "getcwd [$i] -> " . getcwd());
}

function shutdown()
{
    debug_cwd(4);
    chdir('/var/www/website');
    debug_cwd(5);
}

chdir('/var/www/website')
debug_cwd(1);
register_shutdown_function('shutdown');
debug_cwd(2);
fastcgi_finish_request();
debug_cwd(3);
exit;
debug_cwd(6); // will not be displayed


Expected result:
----------------
$> tail /var/log/syslog
Dec 17 15:09:43 hosting php: getcwd [1] -> /var/www/website
Dec 17 15:09:43 hosting php: getcwd [2] -> /var/www/website
Dec 17 15:09:43 hosting php: getcwd [3] -> /var/www/website
Dec 17 15:09:43 hosting php: getcwd [4] -> /var/www/website
Dec 17 15:09:43 hosting php: getcwd [5] -> /var/www/website

Actual result:
--------------
$> tail /var/log/syslog
Dec 17 15:09:43 hosting php: getcwd [1] -> /var/www/website
Dec 17 15:09:43 hosting php: getcwd [2] -> /var/www/website
Dec 17 15:09:43 hosting php: getcwd [3] -> /var/www/website
Dec 17 15:09:43 hosting php: getcwd [4] -> /
Dec 17 15:09:43 hosting php: getcwd [5] -> /var/www/website

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 [2020-12-17 14:34 UTC] cmb@php.net
-Status: Open +Status: Not a bug -Package: *General Issues +Package: *Directory/Filesystem functions -Assigned To: +Assigned To: cmb
 [2020-12-17 14:34 UTC] cmb@php.net 
See <https://www.php.net/manual/en/function.register-shutdown-function.php#refsect1-function.register-shutdown-function-notes>.
 [2020-12-17 14:52 UTC] heavy-traffic-website at yopmail dot com 
I only use PHP-FPM with Haproxy with FCGI, not Apache.

I understand there is a little notice that inform it can change during the shutdown function... but... is this normal for our use / need ? Probably not.

Why don't you are able to restore the CWD during the shutdown function ? Since i am able to write a one-line fix ; it should be evaluated the feature to not change the CWD during the shutdown function.
 [2020-12-17 14:54 UTC] heavy-traffic-website at yopmail dot com
-Type: Bug +Type: Feature/Change Request
 [2020-12-17 14:54 UTC] heavy-traffic-website at yopmail dot com 
Not a Bug ? -> Feature
 [2020-12-17 14:59 UTC] cmb@php.net
-Status: Not a bug +Status: Open -Assigned To: cmb +Assigned To:
 [2021-01-07 14:21 UTC] cmb@php.net
-Status: Open +Status: Duplicate -Assigned To: +Assigned To: cmb
 [2021-01-07 14:21 UTC] cmb@php.net 
Well, actually a duplicate of bug #40661.
 
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