I have a shared library class for working with files, it uses hudson.FilePath for most of its operations. When trying to get the permissions for /bin/ls using FilePath.mode() is returning 493. 9 being an invalid number I think.

When getting the permission using sh('ls -la /bin/ls') the returned value is
-rwxr-xr-x 1 root root 130736 Feb 22 2017 /bin/ls
Which I'm pretty sure is 755.

I'm not exactly sure what is going on, I tried on another file in my workspace and not 420 when I was expecting 644.

Here is the code I'm using to test.

static void test() {
    FilePath lsPath = new FilePath(null, '/bin/ls')
    Build build = new Build()
    Object wfs = build.getWorkFlowScript()
    wfs.println lsPath.mode()
}

 
I took a look in the code for FilePath and traced the code to here. But I don't have any real experience debugging Java or Jenkins and I'm not really sure how to continue.