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Difference between revisions of "Virgo/Committers"

(jsch library)
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A Contextual Bash History can be very useful, guide [[Virgo/Committers/Bash| here]].
A Contextual Bash History can be very useful, guide [[Virgo/Committers/Bash| here]].
== Eclipse Setup ==
After installing the Virgo IDE tooling and AJDT into Eclipse, you are ready to
= Testing =  
= Testing =  

Revision as of 07:58, 27 February 2012

Committers Charter

Committers are responsible for:

  • Maintaining and enhancing the Virgo code base
  • Ensuring the Hudson CI jobs pass all tests (blue ball)
  • Responding to queries on virgo-dev
  • Handling contributions
  • Developing contributors into committers
  • Complying with Eclipse IP policy
  • Keeping an eye on the Virgo forum

Machine Setup

You need Sun JDK 6, Apache Ant 1.8.2 or later, and git. You'll probably want an IDE such as Eclipse and, in order for Virgo projects to build under Eclipse, the Virgo IDE tooling and AJDT (the current update site may be found on

Don't forget to install AJDT as this is needed so that Eclipse produces the same compiled classes as the Ant build!

At the time of writing, some ant targets occasionally fail because they cannot load classes from jsch-0.1.42.jar. A workaround on Mac OS X is to copy this JAR from virgo-build's /lib/ivy directory to /opt/local/share/java/apache-ant/lib.

On Mac OS X, increase the default number of concurrently open files by adding this to .profile:

       ulimit -n 10000

To run certain scripts (don't run them unless you know what you're doing—and why), you'll need ruby, gems, and the 'choice' gem. On Mac OS you can get these by installing the XCode tools (from the Mac OS X disk) and MacPorts, then issuing:

       sudo port -v install ruby
       sudo port -v install rb-rubygems 
       sudo gem install --remote choice

To run scripts such as Releaselor or Ripplor you'll need to:

  1. Generate SSH key by calling ssh-keygen without a passphrase
  2. Upload your public SSH key to
    • login with user virgoBuild
    • follow the steps described here
  3. Log in (adding the host key) at lease once to:
  4. Add your private key to ANT_OPTS:

If you have headless environment you may want to add to ANT_OPTS:


To enable Clover you will need to specify in ANT_OPTS the path to the licence:


Notes for Ubuntu 10.04


I have found that the sun-java6-jdk package is not installable directly from a fresh install of this level of Ubuntu (I'm running this in a virtual machine). (I set JAVA_HOME to be /usr/lib/jvm/java-6-sun which is a symbolic link, and this doesn't need updating after the install below.)

To get the jdk to be installed I issued the following commands (which you might find useful):

   sudo add-apt-repository "deb lucid partner"

(which made the package visible to the package-manager)

   sudo apt-get update

(to reset the package-manager indexes)

   sudo apt-get install --fix-missing sun-java6-jdk

The --fix-missing option is necessary since other packages are required.

jsch library

The JCraft's jsch library needed for SSH/SCP support in ANT may need to be installed, e.g.:

   sudo apt-get install libjsch-java

Check in ANT if its available:

   ant -diagnostics

If the output says under "Tasks availability" sshexec : Missing dependency com.jcraft.jsch.Logger, then you'll need to provide this library to ANT. On Linux you can do this by creating a symlink:

   sudo ln -s /usr/share/java/jsch-0.1.42.jar /usr/share/ant/lib/jsch-0.1.42.jar

or on Mac OS, place (a link to) the JAR in ~/.ant/lib:

   cp jsch-0.1.42.jar ~/.ant/lib/.

Finally, you may check if the JAR is correct (as suggested in this blog):

   jar tvf /usr/share/ant/lib/jsch*jar


   jar tvf ~/.ant/lib/jsch*jar

If everything is ok you should get a list of files inside the archive. Be sure to check "ant -diagnostics" too.


In addition to detailed coding and testing policies describe later, there are some specific policies that committers need to be aware of.

Event Log Message Policy

Please avoid renumbering event log messages when possible. People sometimes write scripts that act on event log messages. Some of our tests may even be sensitive to the numbers. So renumbering an event log message can cause unnecessary disruption to our users and ourselves.


You can grok the high level structure of Virgo by understanding the set of git repositories that comprise Virgo.

Use OpenGrok for searching the master branch of the entire Virgo code base. Always specify "Virgo" in the File Path field to avoid hits in Gemini Web and SpringSource dm Server which are also included in that index. Note that there is a link to OpenGrok on the Virgo home page for convenience.

To get an idea of the dependency structure, use OpenGrok specifying "virgo build.versions" in the File Path field and, to see dependencies on a specific component, the component name in Full Search. For example, this search shows the git repositories that depend on the kernel.


Virgo has a strong emphasis on maintainable, or "clean", code. If you need a really good introduction to coding, we recommend "Code Complete". If you are already a proficient programmer and want to write really clean code, read "Clean Code". If you are not an expert in writing Java, read "Effective Java".

Virgo code is thread safe unless specifically stated. Achieving thread safety in Java is not easy. We recommend "Java Concurrency in Practice" for a good grounding in Java concurrency.

Coding guidelines are here.

A Contextual Bash History can be very useful, guide here.

Eclipse Setup

After installing the Virgo IDE tooling and AJDT into Eclipse, you are ready to


See Test.

Hudson CI

Committers should subscribe to so they are notified when builds fail, become unstable, become stable, etc.

Build breaks should be investigated as soon as they occur and should be fixed as soon as possible.

IP Due Diligence

Handling Code Contributions

Committers are responsible for ensuring that Eclipse IP policy, summarised in the legal poster, is adhered to.

Patches must be attached to a bugzilla bug and have its iplog flag set to '+', and the contributor must confirm in the bug that: they wrote 100% of the code, they have the right to contribute the code to Eclipse, and new Java files contain the appropriate license header.

If the contribution is provided in an external git repository, it is not necessary to attach a patch to the bug: details here.

Raising "works with" CQs

"works with" CQs are required for test dependencies which are not distributed with Virgo or checked in to Eclipse version control (git, svn, cvs).

The initial set of test dependencies was determined, for repositories which are built with ant, as follows:

1. In the build-xxx directory run ant report

2. Extract a raw list of the test dependency jars

find <report directory> -name "*-test.xml" -exec grep -E \/.+\.jar  {} \; >test-jars.txt

3. Edit test-jars.txt using an editor with a regular expression global change facility and do the following global changes.

3.1 Replace regex .+\/(.+)\.jar\"> with $1.jar.

3.2 Replace regex .+\/(.+)\.jar\"\/> with $1.jar.

3.3 Replace -sources with the empty string

4. Sort test-jars.txt and remove duplicate lines.

5. Look through test-jars.txt and raise "works with" for any JARs which don't have a Virgo CQ for the correct version. Also, raise corresponding Virgo bugzillas and set the iplog flag to enter the bugzillas in the automated IP log.

Development process advice

To enable distributed and cooperative development, some simple rules and processes need to be followed. These are all subject to change and are in the nature of advice rather than laws.

The advice is here.

Agile Project Management

The basic principle is that tasks which need to be worked on are placed in the backlog. For a particular sprint, some of the tasks in the backlog are moved to the sprint and completed. So no task appears in both the backlog and a sprint.

Import bugs from bugzilla into Acunote as follows:

  1. Export all the open bugs for Virgo (and Gemini Web if you like) to a CSV file using the CSV link on the bugzilla search results panel.
  2. Go to the "Imported from bugzilla" sprint (not really a sprint at all) and import the CSV using the Tools link followed by "Import tasks from Bugzilla" (not "Import tasks from CSV"). Make a note of the task numbers added.
  3. Go to the "Imported from bugzilla" sprint and copy the tasks added in the previous step to the backlog.
  4. It is helpful to categorise bugs and features using the "More Actions" pull down. We put the bugs at the top of the backlog so we don't lose track of them.

To work on a sprint:

  1. Add a sprint.
  2. Move tasks from the backlog into the new sprint to work on them. If you don't complete them, move them to a new sprint or move them back to the backlog.

Since we are trying to use Acunote to manage sprints in Southampton, Sofia, and potentially elsewhere, please ensure that bugzilla is kept up to date in case the Acunote data gets corrupted.

Note that we never remove tasks from the "Imported from bugzilla" so that subsequent imports do not accidentally re-create finished tasks. The maintainers of Acunote recommended this technique.

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