Re: RPM C API (and other fun acronyms)

[Jeff Johnson <n3npq jbj gmail com>]

On Sep 27, 2006, at 3:15 PM, R. Tyler Ballance wrote:

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> Sorry for prolonging this thread, but I wanted to tack on one more  
> question ;)
>
> Is there a sort of wildcard for the rpm db functions to where I can  
> essentially query similar to an `rpm -qa` and list all the  
> installed packages.
>
> Am I naive in thinking that "*" would work? :)

Well, its a database, and so has records and record boundaries which  
need to be taken into account.

Meanwhile, there's some logic to filter on tag values. Try the following
	rpm -qa a\*
	rpm -qa 'arch=noarch'
	rpm -qa '!arch=i*'
etc, etc ("arch" is a tag name, substitute any tag name displayed by  
rpm --querytags, multiple items
are implicitly &&)

Note that the search is sequential through all headers and so dirt  
slow. Adding --nodigest and --nosignature
will recover some of the speed back.

Note also that there are "optional" tags as well, that may or may not  
exist, and so matching a value
that is not present is undefined and may not be to your expectations.

The matching "works" within the above caveats.

See <rpm/rpmdb.h> for the method to set from C after rpmdbInitIterator 
() call, look for MIRE as in
Match Iterator Regular Expression.

73 de Jeff

> Cheers,
>
> - -R. Tyler Ballance
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