Integrate Git into ANT targets

Hi, There:

For some of our projects, we still use ANT instead of Maven. And we have the need to build project directly out of GIT using ANT targets to ensure consistency for production deployment. If you don’t use Jenkins, then running ANT from Eclipse or Command Line is the option to have. The integration of ANT and Git is not all that straightforward. From the web, there are some good examples of how to do this, and this one works for us:

<target name="git.get.source">
 <delete dir="${LOCAL_PATH}"/>
 <mkdir dir="${LOCAL_PATH}"/>
 <git command = "clone">
 <args>
 <arg value = "--progress" />
 <arg value = "--verbose" />
 <arg value = "${GIT_URL}" />
 <arg value = "${LOCAL_PATH}" />
 </args>
 </git> 
 </target>

<!-- git macro utils setup -->
 <macrodef name = "git">
 <attribute name = "command" />
 <attribute name = "dir" default = "" />
 <element name = "args" optional = "true" />
 <sequential>
 <echo message = "git @{command}" />
 <exec executable = "${GIT_EXE_PATH}" dir = "@{dir}">
 <arg value = "@{command}" />
 <args/>
 </exec>
 </sequential>
 </macrodef>

The above ANT scripts assumes that you have installed Git client and ${GIT_EXE_PATH} is where the git.exe resides. After the source code project is cloned into ${LOCAL_PATH}, building project is simply to run typical ANT targets such as compile and jar.

There is one error I have encountered, however, if the ${LOCAL_PATH} is synchronized into any Eclipse project,  this annoying error would occur the next time you run the git.get.source:

Unable to delete ..
.git\objects\pack\pack-b38c095fff6a391435a492ccf49985ed82dfd245.pack

It turns out that Eclipse is keeping an eye on the Git status as well and have a file lock on this pack file. It is not really a bug per se, just multiple processes are working on the Git Status of the clone.

The only way to get around this issue if you want to run ANT script within Eclipse is to use a folder for ${LOCAL_PATH} that is not under the control of Eclipse project. For example, use c:\temp\myproject\ for ${LOCAL_PATH} would work just fine. Since we don’t plan to modify the codes from GIT in Eclipse but simply want to build the project out of Git sources, this trick is good to use.

Cheers!

-Tony

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