Question

I am writing a PHP application, and I’ve just encountered a really wierd error. After a recent move to a new (Ubuntu) server, i started getting fatal errors on a require_once statement. So obviously the file doesn’t exist, or the file permissions are wrong, right?

No, as it turns out:

The file does exist
The file is checked out from an SVN repository. When I go into the folder and list the files (ls or ls -l) the file is clearly there and has the correct file size. When I update the file in the repository and update the working copy, the changes are copied to the working copy. The file has permissions 755, so everyone should be able so see and read it. Other files in the same directory are working just fine.

The file also doesn’t exist:
PHP exits with a fatal error because the file can’t be found. If I use the find-command, the file is not found. If I try to use nano to edit the file, it claims it does not exist. If I start typing the filename and press tab to autocomplete, it can’t find the file.

This behaviour has now happened on two separate servers, but it works fine on a third server. All the servers run Ubuntu 10.04.

Does anyone have any idea what is going on?

EDIT:
File name is AdminIpv4RangeAddFormHandler.inc.

Full error message, with file paths obscured:

Warning: require_once(fullpath/AdminIpv4RangeAddFormHandler.inc): failed to open
stream: No such file or directory in fullpath/anotherfile.inc on line 34 Fatal error: 
require_once(): Failed opening required 'fullpath/AdminIpv4RangeAddFormHandler.inc' 
(include_path='.:/usr/share/php:/usr/share/pear') in fullpath/anotherfile.inc on line 
34 

The following command produces no output:

find -name AdminIpv4RangeAddFormHandler.inc -ls

A regular ls -li outputs (amongst others) this row:

2233407 -rwxr-xr-x 1 root root 1597 2011-12-13 08:02 AdminIPv4RangeAddFormHandler.inc

Answer 1

Take a good long look at your filenames:

AdminIpv4RangeAddFormHandler  # from PHP
AdminIpv4RangeAddFormHandler  # from find command
AdminIPv4RangeAddFormHandler  # from ls output
      ^

You should pick IP or Ip and stick with the decision everywhere.