Werner's Miscellanea
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Source at commit 001ca49cc60a1315ac7bff8bf488fa188f3a10af created 12 years 6 months ago. By Werner Almesberger, m1/perf/: build the patch compiler with gcc and with profiling | |
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1 | qpkg - Quick package database query |
2 | =================================== |
3 | |
4 | qpkg is a tool that reads package databases of the kind used by opkg |
5 | in OE-derived Jlime (which are very similar to what dpkg and apt use) |
6 | and that can answer a number of queries on them. |
7 | |
8 | While being able to perform some of the database operations commonly |
9 | found in package managers, qpkg is not a package manager itself. |
10 | However, it may be used to help a package manager do its work faster. |
11 | |
12 | |
13 | Except for the files jrb.h and jrb.c, this work is distributed under |
14 | the terms of the GNU GENERAL PUBLIC LICENSE, Version 2: |
15 | |
16 | This program is free software; you can redistribute it and/or modify |
17 | it under the terms of the GNU General Public License as published by |
18 | the Free Software Foundation; either version 2 of the License, or |
19 | (at your option) any later version. |
20 | |
21 | For your convenience, a copy of the complete license has been included |
22 | in the file COPYING.GPLv2. |
23 | |
24 | |
25 | The implementation of red-black trees, in jrb.h and jrb.c, is |
26 | distributed under the terms of the GNU Lesser General Public License, |
27 | Version 2.1: |
28 | |
29 | This library is free software; you can redistribute it and/or |
30 | modify it under the terms of the GNU Lesser General Public |
31 | License as published by the Free Software Foundation; either |
32 | version 2.1 of the License, or (at your option) any later version. |
33 | |
34 | For your convenience, the original copyright notice accompanying JRB |
35 | and a copy of the license have been included in the files READNE.jrb |
36 | and LICENSE.jrb, respectively. |
37 | |
38 | |
39 | Objectives |
40 | ---------- |
41 | |
42 | The original motivation for qpkg comes from the observation that opkg |
43 | consumes inordinate amounts of memory when determining the |
44 | prerequisites for installing a package on a given system, and the |
45 | proof of concept implementation of a shell script wrapper by Rafael |
46 | Zurita, that performs a large subset of the same task with much less |
47 | overhead. |
48 | |
49 | qpkg thus aims to load and parse large package databases as quickly |
50 | and memory-efficiently as possible, and to provide a number of query |
51 | functions that operate on the data. |
52 | |
53 | A second objective is to provide a means to test the integrity of a |
54 | package database, and to perform simple "what if" queries, e.g., to |
55 | test which packages would become uninstallable if a package was to be |
56 | removed or a conflict was to be introduced. |
57 | |
58 | This is to aid not only in general housekeeping of package databases, |
59 | but also to assist in generating - at the package level - restricted |
60 | distributions derived from a master distribution. |
61 |
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