2 BuildBot: build/test automation
3 http://buildbot.sourceforge.net/
4 Brian Warner <warner-buildbot @ lothar . com>
9 The BuildBot is a system to automate the compile/test cycle required by most
10 software projects to validate code changes. By automatically rebuilding and
11 testing the tree each time something has changed, build problems are
12 pinpointed quickly, before other developers are inconvenienced by the
13 failure. The guilty developer can be identified and harassed without human
14 intervention. By running the builds on a variety of platforms, developers
15 who do not have the facilities to test their changes everywhere before
16 checkin will at least know shortly afterwards whether they have broken the
17 build or not. Warning counts, lint checks, image size, compile time, and
18 other build parameters can be tracked over time, are more visible, and
19 are therefore easier to improve.
21 The overall goal is to reduce tree breakage and provide a platform to run
22 tests or code-quality checks that are too annoying or pedantic for any human
23 to waste their time with. Developers get immediate (and potentially public)
24 feedback about their changes, encouraging them to be more careful about
25 testing before checkin.
30 * run builds on a variety of slave platforms
31 * arbitrary build process: handles projects using C, Python, whatever
32 * minimal host requirements: python and Twisted
33 * slaves can be behind a firewall if they can still do checkout
34 * status delivery through web page, email, IRC, other protocols
35 * track builds in progress, provide estimated completion time
36 * flexible configuration by subclassing generic build process classes
37 * debug tools to force a new build, submit fake Changes, query slave status
38 * released under the GPL
43 The PyCon paper has a good description of the overall architecture. It is
44 available in HTML form in docs/PyCon-2003/buildbot.html, or on the web page.
46 docs/buildbot.info contains the beginnings of the User's Manual, and the
47 Installation chapter is the best guide to use for setup instructions. The
48 .texinfo source can also be turned into printed documentation.
52 Python: http://www.python.org
54 Buildbot requires python-2.2 or later, and is primarily developed against
55 python-2.3. The buildmaster uses generators, a feature which is not
56 available in python-2.1, and both master and slave require a version of
57 Twisted which only works with python-2.2 or later. Certain features (like
58 the inclusion of build logs in status emails) require python-2.2.2 or
59 later, while the IRC 'force' command requires python-2.3 .
61 Twisted: http://twistedmatrix.com
63 Both the buildmaster and the buildslaves require Twisted-1.3.0 or later.
64 It has been mainly developed against Twisted-2.0.1, but has been tested
65 against Twisted-2.1.0 (the most recent as this time), and might even work
66 on versions as old as Twisted-1.1.0, but as always the most recent version
69 When using the split subpackages of Twisted-2.x.x, you'll need at least
70 "Twisted" (the core package), and you'll also want TwistedMail,
71 TwistedWeb, and TwistedWords (for sending email, serving a web status
72 page, and delivering build status via IRC, respectively).
74 CVSToys: http://purl.net/net/CVSToys
76 If your buildmaster uses FreshCVSSource to receive change notification
77 from a cvstoys daemon, it will require CVSToys be installed (tested with
78 CVSToys-1.0.10). If the it doesn't use that source (i.e. if you only use
79 a mail-parsing change source, or the SVN notification script), you will
84 Please read the User's Manual in docs/buildbot.info (or in HTML form on the
85 buildbot web site) for complete instructions. This file only contains a brief
88 RUNNING THE UNIT TESTS
90 If you would like to run the unit test suite, use a command like this:
92 PYTHONPATH=. trial -v buildbot.test
94 This should run up to 175 tests, depending upon what VC tools you have
95 installed. On my desktop machine it takes about four minutes to complete.
96 Nothing should fail, a few might be skipped. If any of the tests fail, you
97 should stop and investigate the cause before continuing the installation
98 process, as it will probably be easier to track down the bug early.
100 Neither CVS nor SVN support file based repositories on network filesystem
101 (or network drives in Windows parlance). Therefore it is recommended to run
102 all unit tests on local hard disks.
104 INSTALLING THE LIBRARIES:
106 The first step is to install the python libraries. This package uses the
107 standard 'distutils' module, so installing them is usually a matter of
108 doing something like:
110 python ./setup.py install
112 To test this, shift to a different directory (like /tmp), and run:
116 If it shows you a brief description of the package and its contents, the
117 install went ok. If it says "no Python documentation found for 'buildbot'",
118 then something went wrong.
121 SETTING UP A BUILD SLAVE:
123 If you want to run a build slave, you need to obtain the following pieces of
124 information from the administrator of the buildmaster you intend to connect
127 your buildslave's name
128 the password assigned to your buildslave
129 the hostname and port number of the buildmaster, i.e. example.com:8007
131 You also need to pick a working directory for the buildslave. All commands
132 will be run inside this directory.
134 Now run the 'buildbot' command as follows:
136 buildbot slave WORKDIR MASTERHOST:PORT SLAVENAME PASSWORD
138 This will create a file called "buildbot.tac", which bundles up all the state
139 needed by the build slave application. Twisted has a tool called "twistd"
140 which knows how to load these saved applications and start running them.
141 twistd takes care of logging and daemonization (running the program in the
142 background). /usr/bin/buildbot is a front end which runs twistd for you.
144 Once you've set up the directory with the .tac file, you start it running
147 buildbot start WORKDIR
149 This will start the build slave in the background and finish, so you don't
150 need to put it in the background yourself with "&". The process ID of the
151 background task is written to a file called "twistd.pid", and all output from
152 the program is written to a log file named "twistd.log". Look in twistd.log
153 to make sure the buildslave has started.
155 To shut down the build slave, use:
157 buildbot stop WORKDIR
160 RUNNING BEHIND A NAT BOX:
162 Some network environments will not properly maintain a TCP connection that
163 appears to be idle. NAT boxes which do some form of connection tracking may
164 drop the port mapping if it looks like the TCP session has been idle for too
165 long. The buildslave attempts to turn on TCP "keepalives" (supported by
166 Twisted 1.0.6 and later), and if these cannot be activated, it uses
167 application level keepalives (which send a dummy message to the build master
168 on a periodic basis). The TCP keepalive is typically sent at intervals of
169 about 2 hours, and is configurable through the kernel. The application-level
170 keepalive defaults to running once every 10 minutes.
172 To manually turn on application-level keepalives, or to set them to use some
173 other interval, add "--keepalive NNN" to the 'buildbot slave' command line.
174 NNN is the number of seconds between keepalives. Use as large a value as your
175 NAT box allows to reduce the amount of unnecessary traffic on the wire. 600
176 seconds (10 minutes) is a reasonable value.
179 SETTING UP A BUILD MASTER:
181 Please read the user's manual for instructions. The short form is that you
182 use 'buildbot master MASTERDIR' to create the base directory, then you edit
183 the 'master.cfg' file to configure the buildmaster. Once this is ready, you
184 use 'buildbot START MASTERDIR' to launch it.
186 A sample configuration file will be created for you in WORKDIR/master.cfg .
187 There are more examples in docs/examples/, and plenty of documentation in the
188 user's manual. Everything is controlled by the config file.
193 Please send questions, bugs, patches, etc, to the buildbot-devel mailing
194 list reachable through http://buildbot.sourceforge.net/, so that everyone