When a file is locked, moving it doesn't throw FileSystemException

[jacekgajek]

In a real file system, the following code would throw FileSystemException with a message "[file]: Device or resource busy" (on Linux).

The memory file system throws exception with message "file still open" when I attempt to delete a file.

However, moving a file does not result in exception

FileChannel.open(sourceFile, StandardOpenOption.WRITE).use { channel ->
    channel.tryLock().use {
         Files.move(sourcePath, targetPath)
    }
}

Expected

FileSystemException with message "[sourcePath]: Device or resource busy".

Actual

No exception is thrown.

[jacekgajek]

@marschall I've raised a PR with a fix.

[marschall]

Thanks. I'll try to have a look later this week.

[marschall]

I have a hard time reproducing this. I added two tests for the behavior you describe in 16e9d03. Both with a FileChannel open for WRITE, one with an additional lock and one without.

I tested with Linux with ext4 and with macOS 15.3 with APFS. Can you run the tests on your system and share the results and details of you system?