Instructions on how to use the buildrunner to execute builds.

The buildrunner is a script which extracts buildsteps from builders and runs them locally on the slave. It is being developed to simplify development on and reduce the complexity of the Chromium build infrastructure. When provided a master name (with master.cfg inside) and a builder, it will either execute steps sequentially or output information about them. is the main script, while is a convenience script that sets up PYTHONPATH for you. Note that you can use to conveniently run other scripts in the build/ directory.

Master/Builder Selection

scripts/tools/ scripts/slave/ --list-masters

will list all masters in the search path. Select a mastername (alternatively, use --master-dir to use a specific directory).

Next, we need to pick a builder or slave hostname to build. The slave hostname is only used to locate a suitable builder, so it need not be the actual hostname of the slave you're on.

To list all the builders in a master, run:

scripts/tools/ scripts/slave/ mastername --list-builders

Example, if you're in /home/user/chromium/build/scripts/slave/:

scripts/tools/ scripts/slave/ chromium --list-builders

will show you which builders are available under the chromium master.

Step Inspection and Execution

You can check out the list of steps without actually running them like so:

scripts/tools/ scripts/slave/ chromium  build56-m1 --list-steps

Note that some exotic steps, such as gclient steps, won't show up in buildrunner.) You can show the exact commands of most steps with --show- commands:

scripts/tools/ scripts/slave/ chromium  build56-m1 --show-commands

Finally, you can run the build with:

scripts/tools/ scripts/slave/ mastername buildername/slavehost

Example, if you're in /home/user/chromium/build/scripts/slave/:

scripts/tools/ scripts/slave/ chromium  build56-m1


scripts/tools/ scripts/slave/ chromium  'Linux x64'

--stepfilter and --stepreject`` can be used to filter steps to execute based on a regex (you can see which with--list-steps). See-help`for more info.


Build properties and factory properties can be specified using --build- properties and --factory-properties, respectively. Since build properties contain a master and builder directive, any master or builder options on the CLI are ignored. Properties can be inspected with either or both of --output-build- properties or --output-factory-properties.


You can specify a log destination (including ‘-’ for stdout) with --logfile. Enabling --annotate will enable annotator output.

Using Within a Buildstep

The an annotated buildrunner can be invoked via chromium_commands.AddBuildStep(). Set the master, builder, and any stepfilter/reject options in factory_properties. For example usage, see f_linux_runnertest in and check_deps2git_runner in

More Information

Running with --help provides more detailed usage and options. If you have any questions or issues please contact