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Date: Mon, 18 Aug 2008 09:58:44 -0700
From: Jim Kleckner <jek-cygwin2 AT kleckner DOT net>
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Subject: Re: File permissions not rx for group in /bin
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Corinna Vinschen wrote:
> On Aug 17 23:07, Jim Kleckner wrote:
>   
>> Larry Hall (Cygwin) wrote:
>>     
>>> Jim Kleckner wrote:
>>>       
>>>> I've read through the various permission documents
>>>> to find the explanation and tried Google without
>>>> figuring this one out.  Hopefully it is very simple.
>>>>
>>>> I have an old cygwin install that I was upgrading
>>>> to the latest 1.5.  I find that the files in /bin
>>>> are mode 700 rather than 750 on my other installations.
>>>> The setup.exe is set to "All Users" although perhaps
>>>> some time in the dark past it might not have been.
>>>>
>>>> This means that users other than the one installing
>>>> cygwin can't use it.  Is there some magic to make that
>>>> work properly?
>>>>         
>>> Did you try "chmod 750 /bin"?
>>>       
>> Uh, yeah.
>>
>> chmod 750 /bin/* works at that moment, but any subsequent
>> installs/reinstalls cause reversion to 700.  So it is like swimming 
>> upstream.
>>     
>
> Larry asked "Did you try "chmod 750 /bin"?"
>
> Larry did not ask "Did you try "chmod 750 /bin/*"?
>   

I have tried that and /bin does remain 750 but the /bin/* reverts to 700
on a reinstall.  (Presumably because /bin doesn't get removed whereas
/bin/* do).

>> Eventually it gets tiring.  getfacl.exe doesn't reveal anything 
>> particularly
>> enlightening.
>>
>> It must be some weird inheritance of permissions thing in
>> Windows that doesn't exist on POSIX.  Quite a mystery though.
>>     
>
> Setup doesn't know (yet) of real POSIX permissions.  It only uses the
> Windows inheritance rules for permissions.  If you want POSIX
> permissions automatically you have to make sure the parent dir has the
> right set of permissions in its ACL.  I'm planning to add real
> POSIX permission handling to setup for Cygwin 1.7, but it might not
> be implemented soon.
>   

NTFS has some truly complicated inheritance rules that
can muck things up.  I suspect that is what is happening
but their tools don't make it easy to see what is going on.



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