[jira] [Created] (IO-499) FilenameUtils.directoryContains(String, String) gives false positive when two directories exist with equal prefixes

["Federico Bonelli (JIRA)" <ji...@apache.org>]

Federico Bonelli created IO-499:
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             Summary: FilenameUtils.directoryContains(String, String) gives false positive when two directories exist with equal prefixes
                 Key: IO-499
                 URL: https://issues.apache.org/jira/browse/IO-499
             Project: Commons IO
          Issue Type: Bug
    Affects Versions: 2.4
            Reporter: Federico Bonelli
            Priority: Minor


In a folder layout as such:

{code}
/foo/a.txt
/foo2/b.txt
{code}

The result of invoking directoryContains is wrong:
{code}
FilenameUtils.directoryContains("/foo", "/foo2/b.txt"); // returns true
{code}

even if "/foo" and "/foo2/b.txt" are the canonical paths, they start with the same characters, and the current implementation of the method fails.

As workaround we are currently appending a path separator '/' to the first argument.
It is noteworthy that the current implementation of FileUtils.directoryContains() reveals this issue because it uses the File.getCanonicalPath() to obtain the String paths of "/foo" and "/foo2/b.txt".



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