Setup for running gitbuilder for the Ceph project
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README.md

Autobuilds for the Ceph Project

This is a set of build scripts and a fabric file (fabfile.py) that allows remote deployment and setup of autobuilds for the ceph project.

Quick Start

To get started quickly, the following commands will allow you to setup and start a ceph autobuild on a given host:

> git clone git@github.com:ceph/autobuild-ceph.git
> cd autobuild-ceph
> sudo apt-get install fabric
> fab gitbuilder_ceph:host=<username>@<hostname>

That performs the appropriate setup on the host to run ceph builds continuously. There must be a password-less ssh access to the hostname and the must have a password-less sudo.

An upstart service named autobuild-ceph gets created on the host that runs the autobuilder.

If available, use sudo stop autobuild-ceph, sudo start autobuild-ceph on the autobuilder host to manage the autobuilder.

If stop/start do not work, /etc/init.d/autobuild-ceph stop, /etc/init.d/autobuild-ceph start will start the daemon: it is a simple shell script.

To get a list of other available commands, run fab -l. Note that fabric expects to be able to ssh to the host you specify, so you should already have ssh keys setup for that host. If no host is specified, fabric will deploy to the set of hosts for the role associated with that command. Also note that the gitbuilder_ceph command sets up the autobuilder to deploy the binary packages to the package server. This requires the rsync keys (rsync-key and rsync-key.pub) for the package server be located in your current directory (fabric copies them to the deployment host). You can get the keys from someone who already has access.

Deploying autobuilders with fabric

Fabric allows you to run commands to deploy a specific autobuilder build script on a node, setup ssh keys, and start the web server for displaying gitbuilder results.

Fabric uses the fabfile.py file in your current working directory. The fabfile.py is essentially a set of roles and commands. The gitbuilder_ceph command runs the defined gitbuilder_ceph function, sending remote commands to each of the hosts defined by the role(s) associated with that function. A role defines a list of hosts where a command will be run, for example, the gitbuilder_ceph role (happens to share the same name as the command) runs the gitbuilder_ceph command on all all the VMs defined in that role.

Implementing your own autobuild

Create a build script

For your project called foo, create a build script build-foo.sh in the top-level directory that executes the steps to build the foo project. The script should assume that the current working directory is the top-level checkout of the foo repository. Gitbuilder controls cloning the foo repository and checking out to the desired branch. Gitbuilder checks the output of this script for lines that have "error:" or "warning:" messages, and reports those as such. If you need to ignore some warnings in the output of your build script, you can add the following echo statements around your build commands:

echo --START-IGNORE-WARNINGS
# build commands here...
./configure whatever
echo --STOP-IGNORE-WARNINGS

To limit which branches are built by gitbuilder, a branches-local script should be installed by the fabfile.py function/command for gitbuilder_foo that outputs only the branches that gitbuilder should build. See the branches-local script in this repo for an example that outputs the branches to build for the ceph autobuilder.

Modify the fabfile.py

First add a role definition called gitbuilder_foo to include a new function with a set of roles. The set of roles should include all the roles where you want to deploy your foo autobuilder. A basic gitbuilder function and role definition looks like this:

@roles('gitbuilder_foo')
def gitbuilder_foo():
    _apt_install(
        'make'
        'libfoodep-dev',
    )
    _gitbuilder(
        flavor='foo',
        git_repo='http://github.com/ceph/foo.git',
        extra_packages=[
            'fakeroot',
            'reprepro',
            ],
    )
_sync_to_gitbuilder('foo', 'deb', 'basic')
sudo('start autobuild-ceph || /etc/init.d/autobuild-ceph start')

Note that the flavor you specify to the _gitbuilder() function determines how your build script is chosen as the build script to run by the gitbuilder tool. The extra_packages specify packages that need to be installed in order to create a deb repository for your autobuilt packages, and the _sync_to_gitbuilder() function performs setup to rsync the binary packages created by the build to the repo hosting server. In order to perform the sync, rsync keys are required. You can get the keys from another user and place them in your checkout directory.

As a final step, define a role that lists the hosts you want to deploy the foo autobuilder onto. By convention, the role shares the same name as the command, i.e. gitbuilder_foo. See the other env.roledef lists at the top of the fabfile for examples.

Deploying your autobuild

Once you've created your build script and modified the fabfile.py to include your gitbuilder command and roles, you should be able to deploy your autobuild with:

fab gitbuilder_foo

Setting up the Autobuild web server

A command to setup lighttpd and point it at the autobuild results exists in the fabfile.py. To start the web server, you can simply do:

fab gitbuilder_serve:role=gitbuilder_foo

How autobuilder works

Running fabric with the autobuild-ceph fabfile.py does a clone of the autobuild-ceph repo into /srv/ on the host(s), installs other needed packages and creates a user to run autobuilder. It then sets up gitbuilder, checking out that repo into /srv/autobuild-ceph/gitbuilder.git, and creates a symlink from the build script you specified (build-foo.sh for example) to build.sh, and another symlink in gitbuilder.git/build.sh that points back to the build.sh in /srv/autobuild-ceph. It then clones the build repo (i.e. foo) into the build directory within gitbuilder.git/, and creates an upstart script in /etc/init/autobuild-ceph. The upstart script simply runs the run script in the /srv/autobuild-ceph directory, which in turn runs the gitbuilder autobuild.sh script. The script checks that new commits exist in the repository before attempting another build, and exits otherwise. The upstart script is configured to respawn once the previous process exits, so the script continuously checks for new commits to the repository.