Puritan

Puritan

Source code. README.

Puritan is an MIT-licensed disk-image compiler for constructing OLPC disk images from sources including RPM repositories and build-stream descriptions. It is loosely derived from a similar tool, Pilgrim, written by David Zeuthen, John Palmieri, C. Scott Ananian, Dennis Gilmore, and Michael Stone and is being considered to replace Pilgrim, along with livecd-tools.

Design

In the puritan framework, each and every compilation (build configuration) is described by a git commit and can be authoritatively identified by a git tag pointing to that commit. Relationships between compilations are recorded in the git version graph.

In the present layout, changes that are suitable for all builds should be included in the 'compiler' puritan branch. Build-specific configuration and instructions should go in other branches and these other branches should be regularly rebased on top of 'compiler' in order to produce highly readable history graphs.

If desired, the RPM and activity sources for each build can be archived in a separate git repository and can be strongly versioned along with the compilation that used them by including the sources as a git submodule in the compilation commit.

Use

The raw dependencies of puritan consist of:

 git-core python-2.5 mock

Mock is used to construct a build root with packages described by the compilation's bootstrap and dependencies files.

On Fedora

The Puritan UI is invoked by installing a puritan rpm (built from the ui branch)

 wget -O puritan.rpm http://dev.laptop.org/~mstone/releases/RPMS/puritan-0.4-1.olpc2.noarch.rpm
 sudo rpm -Uvh puritan.rpm

then by checking out a 'puritan compilation' to be run by /usr/bin/puritan

 $(git clone git://dev.laptop.org/users/mstone/puritan compilation; cd compilation; git checkout origin/devel_jffs2)
 puritan -v ./compilation HEAD ./results build

If you want to download a set of RPMs for post-processing (for example, because you want to layer a risky feature on top of them), you can also run

 puritan -v ./compilation HEAD ./results download

Your results should appear in ./results.

On Debian

Note: yum seems to be broken on Debian at the moment, which is preventing this recipe from working. :( --Michael Stone 03:02, 7 March 2008 (EST)

 sudo apt-get install mock git-core
 sudo usermod -a -G mock $USERNAME
 git clone git://dev.laptop.org/users/mstone/puritan ui
 $(git clone git://dev.laptop.org/users/mstone/puritan compilation; cd compilation; git checkout origin/devel_jffs2)
 /usr/bin/python2.5 ui/puritan/main.py ./compilation HEAD ./results

Help Out

Finally, please help improve puritan by

• making it work on your platform
• fixing the devel_ext3 compilation
• adding some reasonable package or buildroot caching system so that it runs faster without impairing build repeatability
• improving the UI with commands for manipulating compilations, or for diffing builds, or for profiling compilations, or ...