is_readable() returns false while require_once returns true

Question

I get false whenever I use the function is_readable on a file shared by my host on a VM, the expected result is true.

I am doing the setup of a local development environment for an existing projet. I don't want to use another function because it's a complex legacy system and I am afraid I would hide other potential problems I would stumble upon later in development.

The VM is set up using vagrant and virtualbox. The OS is a Windows Server 2008 machine with Zend Server with PHP 5.3 hosting code shared on the host, which is a Mac.

The shared folder is created as follow:

vmConfig.vm.synced_folder "/path/to/shared/folder/cms", '/cms', mount_options: ["dmode=775,fmode=664,type=smb"], owner: 'wcmadmin', group: 'wcmadmin'

A piece of code is trying to see if a file is readable. is_readable returns false. I run the script via command line with both users wcmadmin and Administrator and I get the same results.

function smarty_core_assemble_plugin_filepath($params, &$smarty)
{
    [...]
    // try relative to cwd (or absolute)
    if (is_readable($_plugin_filepath)) {
        $_return = $_plugin_filepath;
        break;
    }
    [...]

I did a test script to dig further:

echo 'is_readable: ';
var_export(is_readable('C:\cms\path\to\file\file.php'));
echo "\n";
echo 'require_once: ';
var_export(require_once('C:\cms\path\to\file\file.php'));

And I have the following results:

is_readable: false
require_once: true

Using file_get_contents on the file returns the content correctly.

Using cygwin, the permissions on the file are as follow:

$ ls -al C:\cms\path\to\file\file.php
-rw-r--r-- 1 wcmadmin None 1498 Apr 18 07:22 C:\cms\path\to\file\file.php

Files path have been changed for the purpose of this question. While they may have some discrepancies, they resolve correctly during real tests.

did not notice at first you were using samba shared folder type, you might want to read http://stackoverflow.com/questions/10818770/php-is-readable-fails-on-readable-samba-directory - check with default sharing folder type if you still have issue — Frederic Henri, Apr 20 '16 at 15:40
I don't understand why you're using two different file paths here. `C:\gesca\cms\backend....` appears to be entirely different than `C:\cms\path\to\file.php`, so it's not terribly surprising if one is readable and the other is not. — David White, Apr 20 '16 at 15:40
@FrédéricHenri found this: https://www.virtualbox.org/ticket/11675 — Stef, Apr 20 '16 at 17:21
Stef, I still don't understand. You're now running is_readable() on a URL, but running file_get_contents() on a local file? Why aren't you running is_readable() on `C:\cms\path\to\file\file.php` ? — David White, Apr 20 '16 at 17:25
My bad again! Wrong copy and paste. But the matter is closed really, it's a bug in virtualbox. I will have to find a work around. — Stef, Apr 20 '16 at 18:42

score 0 · Accepted Answer · answered Apr 20 '16 at 18:44

0

It's a bug in virtual box and is still happening as of version 5.0.18.

See: https://www.virtualbox.org/ticket/11675

answered Apr 20 '16 at 18:44

Stef

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is_readable() returns false while require_once returns true

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