2010-11-20 12:29:18 +02:00
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qpkg - Quick package database query
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===================================
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2010-11-20 11:29:57 +02:00
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qpkg is a tool that reads package databases of the kind used by opkg
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in OE-derived Jlime (which are very similar to what dpkg and apt use)
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and that can answer a number of queries on them.
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While being able to perform some of the database operations commonly
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found in package managers, qpkg is not a package manager itself.
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However, it may be used to help a package manager do its work faster.
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Except for the files jrb.h and jrb.c, this work is distributed under
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the terms of the GNU GENERAL PUBLIC LICENSE, Version 2:
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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For your convenience, a copy of the complete license has been included
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in the file COPYING.GPLv2.
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The implementation of red-black trees, in jrb.h and jrb.c, is
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distributed under the terms of the GNU Lesser General Public License,
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Version 2.1:
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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For your convenience, the original copyright notice accompanying JRB
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and a copy of the license have been included in the files READNE.jrb
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and LICENSE.jrb, respectively.
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Objectives
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----------
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The original motivation for qpkg comes from the observation that opkg
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consumes inordinate amounts of memory when determining the
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prerequisites for installing a package on a given system, and the
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proof of concept implementation of a shell script wrapper by Rafael
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Zurita, that performs a large subset of the same task with much less
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overhead.
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qpkg thus aims to load and parse large package databases as quickly
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and memory-efficiently as possible, and to provide a number of query
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functions that operate on the data.
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A second objective is to provide a means to test the integrity of a
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package database, and to perform simple "what if" queries, e.g., to
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test which packages would become uninstallable if a package was to be
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removed or a conflict was to be introduced.
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This is to aid not only in general housekeeping of package databases,
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but also to assist in generating - at the package level - restricted
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distributions derived from a master distribution.
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