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From Dennis Gearon <>
Subject Re: unix permission styles for access control
Date Wed, 19 Jan 2011 14:47:00 GMT
so fieldName.x ishow to address bits?

 Dennis Gearon

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----- Original Message ----
From: Toke Eskildsen <>
To: "" <>
Sent: Wed, January 19, 2011 12:23:04 AM
Subject: Re: unix permission styles for access control

On Wed, 2011-01-19 at 08:15 +0100, Dennis Gearon wrote:
> I was wondering if the are binary operation filters? Haven't seen any in the 
> book nor was able to find any using google.
> So if I had 0600(octal) in a permission field, and I wanted to return any 
> records that 'permission & 0400(octal)==TRUE', how would I filter that?

Don't you mean permission & 0400(octal) == 0400? Anyway, the
functionality can be accomplished by extending your index a bit.

You could split the permission into user, group and all parts, then use
an expanded query.

If the permission is 0755 it will be indexed as
user_p:7 group_p:5 all_p:5

If you're searching for something with at least 0650 your query should
be expanded to 
(user_p:7 OR user_p:6) AND (group_p:7 OR group_p:5)

Alternatively you could represent the bits explicitly in the index:
user_p:1 user_p:2 user_p:4 group_p:1 group_p:4 all_p:1 all_p:5

Then a search for 0650 would query with
user_p:2 AND user_p:4 AND group_p:1 AND group_p:4

Finally you could represent all valid permission values, still split
into parts with
user_p:1 user_p:2 user_p:3 user_p:4 user_p:5 user_p:6 user_p:7
group_p:1 group_p:2 group_p:3 group_p:4 group_p:5
all_p:1 all_p:2 all_p:3 all_p:4 all_p:5

The query would be simply
user_p:6 AND group_p:5

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