Jordi Sola created IO-807:
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Summary: FileUtils.requireExists does not take into account soft
links
Key: IO-807
URL: https://issues.apache.org/jira/browse/IO-807
Project: Commons IO
Issue Type: Improvement
Components: Utilities
Affects Versions: 2.13.0
Reporter: Jordi Sola
The current sources for `FileUtils.requireExists` and `FileUtils.
requireExistsChecked` just check for the existence of the file, delegating to
the `File.exists` method:
{code:java}
Objects.requireNonNull(file, fileParamName);
if (!file.exists()) {
throw ...
}
return file;{code}
The default `file` implementation returns `false` if the file is a broken
symbolic link (that is, a symbolic link pointing to an non-existing file).
While this implementation can be seen as correct most of the time, sometimes we
need to avoid following the link, and evaluate the existence of the link itself.
For example, when using `FileUtils#copyDirectory` with the
`LinkOption.NOFOLLOW_LINKS` option, it is expected that broken links are copied
(see JavaDocs for `java.nio.file.Files#copy`). Nonetheless, as
`FileUtils#requireFileIfExists` returns `false`, the file is just ignored.
One possible approach is relying in `java.nio.file.Files#isSymbolicLink` when
`LinkOption.NOFOLLOW_LINKS` options is provided.
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