Bug #79806 [NEW]: realpath() erroneously resolves link to link

From: Date: Tue, 07 Jul 2020 15:19:45 +0000
Subject: Bug #79806 [NEW]: realpath() erroneously resolves link to link
Groups: php.bugs 
Request: Send a blank email to php-bugs+get-227868@lists.php.net to get a copy of this message
From:             cmb
Operating system: Windows NTS
PHP version:      7.4.7
Package:          Filesystem function related
Bug Type:         Bug
Bug description:realpath() erroneously resolves link to link

Description:
------------
On Windows realpath() only resolves the first level (soft or hard)
link, but does not go further.  This does neither match the
behavior on Linux (as far as I know), not the documentation which
states:

| The resulting path will have no symbolic link, […]



Test script:
---------------
<?php
touch(__DIR__ . '/link.txt');
symlink(__DIR__ . '/link.txt', __DIR__ . '/link1.lnk');
symlink(__DIR__ . '/link1.lnk', __DIR__ . '/link2.lnk');

var_dump(substr(realpath(__DIR__ . '/link2.lnk'), strlen(__DIR__)));
?>

Expected result:
----------------
string(9) "\link.txt"

Actual result:
--------------
string(10) "\link1.lnk"

-- 
Edit bug report at https://bugs.php.net/bug.php?id=79806&edit=1
-- 
Fix committed:                    https://bugs.php.net/fix.php?id=79806&r=fixed
Fixed in release:                 https://bugs.php.net/fix.php?id=79806&r=alreadyfixed
Need backtrace:                   https://bugs.php.net/fix.php?id=79806&r=needtrace
Need Reproduce Script:            https://bugs.php.net/fix.php?id=79806&r=needscript
Try newer version:                https://bugs.php.net/fix.php?id=79806&r=oldversion
Not developer issue:              https://bugs.php.net/fix.php?id=79806&r=support
Expected behavior:                https://bugs.php.net/fix.php?id=79806&r=notwrong
Not enough info:                  https://bugs.php.net/fix.php?id=79806&r=notenoughinfo
Submitted twice:                  https://bugs.php.net/fix.php?id=79806&r=submittedtwice
register_globals:                 https://bugs.php.net/fix.php?id=79806&r=globals
PHP version support discontinued: https://bugs.php.net/fix.php?id=79806&r=phptooold
Daylight Savings:                 https://bugs.php.net/fix.php?id=79806&r=dst
IIS Stability:                    https://bugs.php.net/fix.php?id=79806&r=isapi
Install GNU Sed:                  https://bugs.php.net/fix.php?id=79806&r=gnused
Floating point limitations:       https://bugs.php.net/fix.php?id=79806&r=float
No Zend Extensions:               https://bugs.php.net/fix.php?id=79806&r=nozend
MySQL Configuration Error:        https://bugs.php.net/fix.php?id=79806&r=mysqlcfg


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