A simple ant script that will commit and push to a git repo.

ant-git.xml

<?xml version="1.0"?>
<project name="Demo" default="version" basedir=".">
	
	<macrodef name="git">
		<attribute name="command" />
		<attribute name="dir" default="" />
		<element name="args" optional="true" />
		<sequential>
			<echo message="git @{command}" />
			<exec executable="git" dir="@{dir}">
				<arg value="@{command}" />
				<args/>
			</exec>
		</sequential>
	</macrodef>

	<target name="version" description="Commits all changes to version git">
		<input message="Commit message" addproperty="commit-message" />
		
		<echo message="Commiting all changes with message ${commit-message}" />
		<git command="add">
			<args>
				<arg value="." />
			</args>
		</git>
		<git command="commit">
			<args>
				<arg value="-am ${commit-message}" />
			</args>
		</git>
		<git command="push" />
	</target>
</project>

macrodef.xml

<macrodef name="git">
	<attribute name="command" />
	<attribute name="dir" default="" />
	<element name="args" optional="true" />
	<sequential>
		<echo message="git @{command}" />
		<exec executable="git" dir="@{dir}">
			<arg value="@{command}" />
			<args/>
		</exec>
	</sequential>
</macrodef>

target.xml

<target name="version" description="Commits all changes to version git">
	<input message="Commit message" addproperty="commit-message" />
	<echo message="Commiting all changes with message ${commit-message}" />
	<git command="add">
		<args>
			<arg value="." />
		</args>
	</git>
	<git command="commit">
		<args>
			<arg value="-am ${commit-message}" />
		</args>
	</git>
	<git command="push" />
</target>

A script working perfectly at the first try. Nice work !