How to lookup the latest git commit hash from an ant build script

I wrote the following ant target for a project on github. Usage:

• stores version in property "repository.version"
• works if no git is installed or no .git directory is present (fallback)
• other targets must depend on this target if they need the git version
• only one git command gets executed (--always)

<available file=".git" type="dir" property="git.present"/><target name="git.revision" description="Store git revision in ${repository.version}" if="git.present">    <exec executable="git" outputproperty="git.revision" failifexecutionfails="false" errorproperty="">        <arg value="describe"/>        <arg value="--tags"/>        <arg value="--always"/>        <arg value="HEAD"/>    </exec>    <condition property="repository.version" value="${git.revision}" else="unknown">        <and>            <isset property="git.revision"/>            <length string="${git.revision}" trim="yes" length="0" when="greater"/>        </and>    </condition></target>

It e.g. be used for expanding the token @repository.version@ in a template file:

<target name="index.html" depends="git.revision" description="build index.html from template">    <copy file="index.html.template" tofile="index.html" overwrite="yes">        <filterchain>            <replacetokens>                <token key="repository.version" value="${repository.version}" />            </replacetokens>        </filterchain>    </copy></target>

This command returns always the working folder's last commit SHA1, useful when you don't always build from HEAD. The command should run both on Windows and *nix systems

<exec executable="git" outputproperty="git.revision">    <arg value="log" />    <arg value="-1" />    <arg value="--pretty=format:%H" /></exec>

Would that be what you are looking for?

git rev-parse HEAD