chown with not existing user/group

[Eric Blake]

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According to Matthieu CASTET on 3/4/2008 6:28 AM:
| Also according to my posix reading [1], chown should be able to change
perm to
| any uid/gid.

You read wrong.  POSIX also allows chown implementations to impose
additional restrictions.  And on cygwin, we impose the additional
restriction that you can't change to a uid/gid that isn't recognized by
Windows.

| I was thinking cygwin goal was to emulate as much as possible posix
| spec.

Yes, and cygwin's behavior in this case is still POSIX compliant.

- --
Don't work too hard, make some time for fun as well!

Eric Blake             ebb9@byu.net
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