On Sep 28, 2006, at 5:49 PM, R. Tyler Ballance wrote:
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On Sep 27, 2006, at 5:17 PM, Jeff Johnson wrote:
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.
I apologize for being dense, but after staring at the rpmdb.h
header, as well as the header documentation (via doxygen) and I'm
still not seeing a solution
I'm assuming you're referring to
int rpmdbSetIteratorRE (rpmdbMatchIterator mi, rpmTag tag,
rpmMireMode mode, const char *pattern);
Yep.
So I'm wondering, do I just not use rpmdbInitIterator() (since I've
got to set the key string there) and will rpmdbSetIteratorRE()
create the proper iterator for dumping all the packages on the
machine?
The programming paradigm for irpmdb iteratotrs is
1) initialize using rpmdbInitIterator
2) (optional) qualify the iteration using, say, rpmdbSetIterorRE()
3) iterate
4) (optional) save headers of interest by referencing using
headerLink().
5) destroy the iterator.
Again, I apologize if I'm coming across dense, I've been working on
code marshalling between C and C#, I'm just trying to find
something to dump the contents of the rpm db (i.e. the installed
packages) in such a manner that I can basically fill out an array
of Header structures.
Hint: Call headerSprintf() on headers that match your criteria to
extract strings that can be passed into C#.
73 de Jeff
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