Buildbot Network

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Buildbot Network

stuarta 13:35, 3 March 2014 (UTC)

MythTV uses an extensive set of buildslaves, running different operating systems, different versions of Qt (Qt4 & Qt5) as well as different compilers. The aim of this is to validate all changesets do not affect our ability to build on the different platforms.

The intention is to ensure that MythTV will build and run on all the current distro flavours, and in particular on the long term stable variants. eg.

  • Debian Stable
  • Ubuntu LTS
  • Fedora
  • RHEL/Centos6 is not an option due to the Qt version being too old.

Build Master

You can look at the progress of current builds or the history of the most recent builds by visiting BuildMaster. I'd recommend either the waterfall or console pages.

Setting up a build slave

Setting up a build slave is a relatively simple process. If you have a server capable of running a virtual machine or three, then offers of buildslaves are always welcome. Please contact the developers via IRC #mythtv on freenode.

Basic VM configuration

  • 1x CPU
  • 2Gb RAM
  • 8Gb OS Disk
  • 50Gb /home


  • 2GB of RAM is required as tv_rec.cpp can take an extremely long time to build and/or timeout the build when running only 1Gb ram (note: this appears to be old information, on a Raspberry Pi 2 with 1GiB memory it take 35 seconds to compile)
  • 50Gb /home is sufficient to hold at least 3 different builds as well as the whole 10Gb ccache


Install the operating system you are planning to use.

Automated Method (Recommended)

Install the ansible and git packages, then clone the MythTV ansible repository

   $ git clone

Then as root, change into the directory where the playbooks were checked out to and run

   # ansible-playbook -i hosts buildslave.yml

This will install all the packages required for a Qt4 based build, as well as configuring ccache and setting up the startup script to start the buildslave when the server starts. All that is left to do is configure the buildslave. Continue from the step "Connecting to the build network"

Manual Method

Here is some information on setting up buildslaves by hand

You should also create a buildslave user, and configure ccache to be allowed to use 10Gb of cache ccache -M 10G

Autostart on boot

NOTE: Only required if you used the manual installation method

Configuring the buildslave to autostart on system boot is a very simple step. Create a script ~/bin/ with the following contents

  cd ~/mythtv
  /usr/bin/buildslave stop
  exec /usr/bin/buildslave start


  • The stop is not a mistake. The stop causes the buildslave to cleanup any old PID files that are present which would otherwise prohibit the buildslave from starting

Then chmod +x ~/bin/

Next edit crontab to start it at boot time. As the buildslave user run crontab -e and add the following line

 @reboot /home/buildslave/bin/

Connecting to the build network

For this you will need to talk to the developers on IRC again. You should create a passwordless ssh key for your buildslave user, this will need to be added to allow the builder to checkout the code from our git repository.

You will be provided with the following pieces of information

  • your buildslave's name
  • the password assigned to your buildslave
  • the hostname and port number of the buildmaster, i.e.

Configure the buildslave

run the 'buildslave' command as follows

  # su - buildslave
  $ mkdir mythtv
  $ buildslave create-slave mythtv SLAVENAME PASSWORD
  $ ssh (accept the host key otherwise you will get git failures on builds.)

Please make sure you edit info/host and info/admin in ~buildslave/mythtv so we know some information about your buildslave and your contact details. NOTE: The startup script installed by the automated method will automatcially populate info/host at startup

buildslave needs to be started if not already running by either reboot, or by running the following as the buildslave user


Then a build can be forced by talking to MythBuild on irc in #mythtv-commits

  MythBuild: force build <build_name> <message>

NOTE: build_name is the name of the e.g. master-ubuntu-current-64bit not SLAVENAME that is name of the buildslave e.g. stuarta-ubuntu-current-64bit