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This file documents how to build the Crowbar installation DVD image. Prerequisites: * An unfiltered Internet connection and a decent amount of bandwidth. The first time you try to build Crowbar it will need to download all the packages that it will need to stage Crowbar onto an OS install DVD. * bash version 4 or higher build_crowbar.sh uses associative arrays, which bash got in version 4. * mkisofs The end product of the build script is an ISO image that will be used to bootstrap the Crowbar admin node. * debootstrap (if staging on to Ubuntu) The build process needs to download all the .debs and gems that Crowbar requires, and we don't want to inadvertently mess up the build machine when we do that. All extra packages are downloaded into a chrooted minimal Ubuntu intall, and we use debootstrap to enable that. * Sudo to root privileges for the following commands: * /bin/mount, /bin/umount We have to be able to mount and umount the Ubuntu .iso image, as well as a tmpfs for debootstrap, and we have to be able to bind mount /dev, /dev/pts, /proc, and /sys into the debootstrap chroot environment. * /usr/sbin/debootstrap debootstrap requires root privileges to run. * /bin/cp We need to copy things into and out of the debootstrap environment to ensure it downloads and caches the right packages. * /usr/sbin/chroot All our package caching is done in a chroot environment, and chroot requires root permissions to run. If you want to allow build_crowbar to run the above commands as root without having to enter a password each time, the build_crowbar.sh includes a sample line you can fix up and add to /etc/sudoers. * A working Sledgehammer tftpboot image. Sledgehammer is a minimal CentOS 5.6 pxe bootable image that we use to perform hardware discovery and configuration for devices that do not have low-level management tools for Ubuntu. You can find information on how to build Sledgehamemr by reading its HOWTO.Non.Redhat file. We do not do fully automated builds of Sledgehammer due to a lack of a CentOS equivalent of debootstrap. Command Line Parameters: * The first command line parameter is the OS you want to stage Crowbar on to. Crowbar currently understands how to stage on to ubuntu-10.10 and redhat-5.6 * --update-cache This parameter forces the build to try and update the build cache again. Use this parameter if you want to pull in updates from the upstream repositories that Crowbar pulls packages from. * --merge|-m Any arguments after this that do not start with a hyphen are interpreted as branches in the git repository that you want to merge along with the current branch into a throwaway branch before staging Crowbar on to the build .iso. If you are working on developing a barclamp or have changes in other branches that you want to test out, this is the option for you. If your build cache is also a git repository, it will try to merge identically named branches in that repository as well -- this is a good way of testing new packages before signing off on them. After the build is finished, the build script will delete any throwaway branches it created, leaving the repositories in the same state they started in. Usage: * Run build_crowbar.sh from the Crowbar git repository. The first time it is run, it will download and cache all the files it needs to stage Crowbar on to the OS installation DVD, build an OS install ISO with Crowbar staged on to it, save the generated .ISO to the current working directory, and print out a message saying where it saved the image. On subsequent runs it will run with the files it cached from the first run, unless update-cache is passed as a parameter to the script. Customization: build_crowbar.sh has several different parameters you can tune, either from $HOME/.build-crowbar.conf (for developer use), or from build-crowbar.conf in the current directory (for automated builds). Here are the parameters you can change through the above configuration files: * DEBUG If DEBUG is set to anything, build_crowbar will run in debug mode, and will print a transcript of everything it is doing to standard error. * CACHE_DIR This is the default location where build_crowbar.sh will keep the files it caches, along with the temporary directories used to mount the ISO image, the debootstrap chroot, and the directory we perform the build in. It defaults to $HOME/.crowbar-build-cache. * ISO_LIBRARY This is the default location where the Ubuntu .iso is stored. It defaults to $CACHE_DIR/iso * ISO_DEST This is the location that we will save the Crowbar install image to. It defaults to the current directory. * IMAGE_DIR This is the location that we will mount isos in. It defaults to $CACHE_DIR/image * SLEDGEHAMMER_PXE_DIR This points to the location we expect to find the unpacked Sledgehammer PXE boot archive. It defaults to $CACHE_DIR/tftpboot * VERSION The default version of Crowbar. Defaults to dev. * BUILT_ISO The name of the ISO that build_crowbar.sh generates. Defaults to crowbar-$VERSION.iso * CROWBAR_DIR The directory that the Crowbar source is cheched out to. Defaults to the directory that build_crowbar.sh is in. * SLEDGEHAMMER_DIR The directory that the Sledgehammer source is checked out to. Defaults to $CROWBAR_DIR/../sledgehammer * VCS_CLEAN_CMD This is the command that build_crowbar.sh will run to clean the tree before staging the Crowbar build. Defaults to 'git clean -f -x -d' The build_crowbar.sh script is heavily commented, please refer to it for more detailed information.