Friday, February 17, 2017

Git Build Number Generator

This tool generate version or build information in a source file format from a pointing local git repository, during the pre-build phase. Currently only supports java code generation. However can be extended to a more generic plugin based system to support other programming languages.

Tool favors command line arguments instead of configuration files to read the parameters, this decision is to speed up the tool, as this tool may be run numbers of times in a time slice.

You can use this in your build script in pre build phase, use in eclipse without a build script is just a use case. Policy of when to run is left to your creativity.


gbn git-repo-directory version-file-directory package-name 

  • git-repo-directory : Absolute path to local .git directory
  • version-file-directory : Absolute path to the directory, to place version source file
  • package-name : Java package name

eg: gbn /home/myhome/gbn/.git /home/myhome/gbn/src/com/alkber/gbn/version/

- -
package com.alkber.gbn.version;
 * This is an auto generated file, modifications will not persist.
 * 2013/09/22 08:48:52
public class VersionInfo {
    public static final String buildNumber = "master.11.71740cc";
    public static final String branch = "master";
    public static final String commit = "11";
    public static final String version = "71740cc639811a5c4249f4344fe5e8586a7a494b";
    public static final String shortVersion = "71740cc";
- -

It is highly advised to place .gitingore in the version-file-directory with .gitingnore content being ''. As this file is updated frequently, it may cause git issues during commit and merge.Further to avoid git issues ignore the *class files.

Simplest Use Case

In eclipse, Goto Project->Properties->Builders , create a new builder

Location: [ path to java binary ]

eg: [ /home/myhome/bin/dk1.7.0_25/bin/java ]

Arguments: [ arguments to java binary]

eg: java -jar /home/myhome/bin/gbn.jar \ 
/home/myhome/git/Click2Limo/.git \ 
/home/myhome/git/Click2Limo/Click2Limo/src/com/frooday/click2limo/version/ \ 

In the refresh tab of new builder setting specify the resource ie our version source file to be refreshed when ever tool is run.

In Build Options tab,

  • Allocate Console
  • During Manual Build
  • During Auto Build
  • During Clean

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