The current location of the PyRPM project is at http://people.redhat.com/laroche/pyrpm/, http://sf.net/projects/pyrpm/ and http://freshmeat.net/projects/pyrpm/.
The newest version can be downloaded from http://people.redhat.com/laroche/pyrpm/download/.
Please send patches to Florian La Roche, Phil Knirsch, Thomas Wörner and Florian Festi.
The cvs source code repository is automatically converted to a git repository at http://www.jur-linux.org/git/?p=cvs-pyrpm.git;a=summary. (This is experimental only, automatically converted from a cvs repository.)
PyRPM is an experimental project to look at rpm package management. It is a python module and a collection of scripts that provide similar functionality as rpm, yum and co. It is written from ground up and is implemented only in python. It mainly deals with rpm packages, the rpm database rpmdb in /var/lib/rpm, comps.xml files and yum repositories (called repo data).
The reason for this project was to have a codebase with which we can test and verify rpm, rpmdb and yum itself and experiment with new features and implementations very quickly. Python is Red Hat's in-house defacto standard, so using python to do rapid prototyping was only logical.
The code itself is still very small and modular. We're constantly looking to improve the code, make it more production ready and remove duplicate functionality. Results from this project back to rpm and co are very important for us to improve the current available Linux tools and not rush with only adding another project for this. Next to working on good algorithms and sane implementations, most code is backed up with verify and testing scripts.
The PyRPM project is by no means meant to be a full replacement of rpm or yum. In its current state we feel confident that in general it won't break anything, but the code isn't production quality yet.
The check scripts can be safely used as they won't modify anything on your system, so feel free to use them at your convenience.
We personally have been using the yum replacement very extensively and even used it to update our own systems, but that's not even remotely a guarantee that it will work on your machine. It has only been run by a few people until now.
Using it to set up buildroots on the other hand should be very safe as this all happens in a very contained environment (sandbox principle).
We do have run lots of installation tests into buildroots and then run update tests. We have also updated between releases like going from Fedora Core 1 over to release 2, 3, 4, … Same with enterprise releases. At least 32bit x86 and 64bit x86_64 should be extensively tested, most other archs should also be ok.
Please let us know of any problems you encounter, if possible with some reproducible test cases so we can figure out what might have happened.
An additional warning about locks when using the pyrpm tools: When using pyrpmyum you will get the yum lock, but unfortunately due to the nature of how rpm locks the rpmdb we can't do those locks from within python. So while using yum and pyrpmyum concurrently works nicely, don't ever use rpm while running pyrpmyum, it's basically guaranteed to break your rpmdb and/or your system.
Over time quite a few nice things have come out of the project:
Stable and reliable dependency resolver with efficient algorithms:
Due to the easy nature of python being a rapid prototyping language and the modular design of pyrpm we were able to test and write several generations of dependency resolvers and over time optimize and improve the reliability of it to a point where we are very confident that the results are what a user would expect.
Handling of multilib systems:
This is connected to the previous feature. Multilib systems are generally a lot trickier to handle than single arch systems. The algorithms used in pyrpm try to make intelligent choices as to which packages should be installed resp. how packages should be updated.
Ordering of all packages in a transaction:
In order for a whole transaction to work reliable it is not enough to just order the installs and updates but also the erase operations properly. In pyrpm we are handling all operations and order them in a way that honors all requirements correctly, even for erases.
Smart like package selection:
In pyrpm we are able to make package selections similar to the SMART package manager by trying to downgrade packages or even remove them if dependencies can't be resolved at all. The semi automatic removal is of course optional and not enabled by default.
Very easy to use scripts to setup changeroots:
Using pyrpmkickstart you can easily use a typical anaconda kickstart file to do an automated install either on a disk, partition, diskimage or even simple changeroots.
SELinux support is only working with newer versions of the python bindings (v 2.0.13+). If the libselinux version is older, then SELinux support is disabled, because there are missing functions and a bug in rpm_execcon.
This is required for PyRPM to work:
python 2.3 or newer. PyRPM is also using the gzip, zlib, bz2, bsddb python modules.
python-elementtree for a fast xml parser (This used to be an extra python module, more recent versions of python have this as standard module.)
python-urlgrabber to read data via http and ftp.
There are also optional dependencies like:
pyparted if you want to use pyrpmkickstart with the —no-stage2 option where the apps from your machine are used instead of the Fedora/base/*.img files.
asciidoc if you want to change the documentation and need to re-generate the html files. The releases already contain pre-generated html files.
python-sqlite if you want to experiment with the optional sqlite database backend.
libselinux-python for proper selinux support
libxml2 with the python bindings in libxml2-python
PyRPM is currently spending most of its CPU and memory on the list of files that are stored within rpm packages. Those are needed for dependency resolution. Re-writing all in C could improve this again and also allow production usage of it. Another possibility would be to change the repodata to allow for reduced data sets and better algorithms. Currently we move most data lookups to sqlite and try to remove unnecessary data lookups.
The available tools are described in pyrpm-tools.html.
A collection of related projects are listed in pyrpm-links.html.
Background information and more development related docu is available in pyrpm-devel.html.
Last updated 2008-02-18 08:02:42 CEST