Pilgrim

For information on current-day OLPC software build systems, see Build system.

WARNING: The content of this section is considered DEPRECATED and OBSOLETE It is preserved for historical or documenting reasons. Pilgrim is a disk-image compiler. This means that it converts collections of packages (RPMs) and hacks into clean-installable disk images for the XO. It is typically run on a dedicated Linux server or virtual machine like xs-dev.laptop.org or pilgrim.laptop.org. 2010 OLPC builds use the OS Builder utility instead. Output from the Build System The build system produces things: An RPM repository, currently located under the repository root The output of the build system is currently located under the streams root at http://pilgrim.laptop.org/~pilgrim/olpc/streams/ for update.1, and somewhere else (maybe http://xs-dev.laptop.org/~cscott/olpc/streams/ for joyride. Files produced For an image called <imagename>, the files you will find inside are... fs.zip - signatures file fs.zip.md5 - the md5 checksum of fs.zip <imagename>.crc - the crc of the image <imagename>.crc.md5 - the md5 checksum of the crc of the image <imagename>.img - the image file itself <imagename>.img.md5 - the md5 checksum of the image file If the image contains Activities and other customizations on top of a build, you will also find the following files. Note that this is rare and typically only done once a year for images shipped on G1G1 XOs. <imagename>.zip - the customization key included in the image. <imagename>.zip.md5 - the md5 checksum of the customization key included in the image. Implementation Details The build system we want to have consists of the following components: /------\ | F7 yum |--------+ | repos | | \------/ V /--------\ +--------+ +----------+ +---------+ /------\ | upstream | | distro | | pkg build| |compose | | stable | | src |-->| SCM |-->| system |-->| tools |-->| rainbow| | repos | | (CVS) | | (Koji) | |(joyride)| | xtest | \--------/ +--------+ +----------+ +---------+ \------/ ^ ^ ^ /--------\ | | | |patches |-----+ | + - - - - - - - + | \--------/ | | dropbox | | +----->| system |----+ /--------\ | | (public_rpms) | | olpc | | + - - - - - - - + | sources |-------+ | (GIT) | \--------/ |-----------| |----------------------------| |-----------------------| sources package maintenance package composition CVS,GIT Koji, Mock, rpmbuild mash, pilgrim, ChangeLogs The one we actually have is fairly similar but the package-construction step is done partially in Koji and partially by individual package maintainers using tools like Mock and rpmbuild. Details Source code Pilgrim is composed of two large and two small scripts and many configuration files. pilgrim # user-interface pilgrim-autobuild # implementation build-one # build the current branch make-repos # touch up yum repositories The most important branch is "autobuild". This is where changes deemed suitable for all build branches should be merged. See Pilgrim Commit Policy. The other branches - joyride, meshtest, xtest, and rainbow store branch-specific data like which yum repositories to compose into the image, which packages to pull, which activities to include, and so on. These data are mostly recorded in streams.d/olpc-branch.conf # a few important config variables streams.d/olpc-development-yum-install.conf # yum repositories to compose, package exclusions streams.d/olpc-development.stream # lists of packages and activities to install Questions: How do you enumerate the available branches? I.e. if you don't want to rely on the documentation being kept up to date... Where can one find the streams.d directory? Motivation This tutorial explains how you can build a completely customized OS image which can be used with: Emulators such as QEMU and VMware Laptops running in developer mode (see Activation and developer keys about running your xo in developer mode and Clean-install procedure about installing OS images) Prerequisites The following procedure has been tested on a Fedora 8 x86_64, but should work just fine on Fedora 7 and on i386. Any Linux distribution capable of running yum should be able to run Pilgrim, maybe with minor adjustments. The intended audience of this document is an OS developer with some experience in rebuilding RPMs and managing yum repositories. Preparation Before installing pilgrim, you need to install mtd-utils. sudo yum install mtd-utils git clone git://dev.laptop.org/users/cscott/pilgrim cd pilgrim make sudo make install Note: this will litter your system with pilgrim files, but you can clean it up later with make uninstall. Prepare your custom repositories Build your custom RPMs and place them in a directory accessible via http. It is recommended, but not necessary, to adopt the standard Fedora layout: i386/os/ - i386 and noarch packages i386/debug/ - debuginfo packages source/ - src rpms Create or update the RPM metadata information for your repositories: createrepo i386/os createrepo i386/debug createrepo source Pilgrim customization Adding your yum repositories Edit streams.d/olpc-development-yum-install.conf and append your yum repository (you only need the one containing the binary RPMs here). Mine looks like this: [olpc-bernie] name=OLPC bernie - i386 baseurl=http://www.codewiz.org/pub/olpc-bernie/i386/os/ enabled=1 gpgcheck=0 Note that I've explicitly specified i386 because the $basearch variable would expand to x86_64 on my host. If you provide the full set of OS packages in your repository, then you should remove the default repositories altogether. Adding repositories for the target Edit streams.d/olpc-development.stream, and find the line saying "Writing out configuration for OLPC yum repo". The repositories listed here will appear in /etc/yum.repos.d on the target and are only used when the image is booted on the target. Add your yum repositories below the official ones. This is what I do for xtest: # keep this in sync with same repo defined in olpc-development-yum-install.conf cat <<EOF > $INSTALL_ROOT/etc/yum.repos.d/olpc-development.repo [olpc_development] name=OLPC development baseurl=http://koji.fedoraproject.org/static-repos/dist-olpc2-build-current/i386/ enabled=1 gpgcheck=0 EOF cat <<EOF > $INSTALL_ROOT/etc/yum.repos.d/olpc-bernie.repo [olpc-bernie] name=OLPC bernie - \$basearch baseurl=http://www.codewiz.org/pub/olpc-bernie/\$basearch/os/ enabled=1 gpgcheck=0 [olpc-bernie-debuginfo] name=OLPC bernie - \$basearch - Debug baseurl=http://www.codewiz.org/pub/olpc-bernie/\$basearch/debug/ enabled=0 gpgcheck=0 [olpc-bernie-source] name=OLPC bernie - Source baseurl=http://www.codewiz.org/pub/olpc-bernie/source/ enabled=0 gpgcheck=0 EOF Adding and removing packages The list of packages that will be installed is in streams.d/olpc-development.stream. If your spec files are correct, you will only need to list the leaf packages here and yum will pull in all their dependencies automatically. Further reading Read README.olpc in the root directory of Pilgrim for further information. The short story is: (become root) ./pilgrim-autobuild --config-dir . --stream olpc-development --dest-dir . If you're only interest in the jffs2 image, do: ./pilgrim-autobuild --config-dir . --stream olpc-development --dest-dir . --variant devel_jffs2 To install OS images see Clean-install procedure.