Inject the Mercurial working directory changeset id such as (838cb9c0367e) into properties file via Maven?

We use Maven for our builds and Mercurial for our changesets. While our software has a major version handled already we would really like to be able to know what Mercurial changeset was used to build any server that runs our software.

Does anybody know of a way in Maven to grab the working directory's changeset in Mercurial and get it into a properties file or something so we can then display it somewhere in our application when sys admins do a "sanity check" against what version is currently running?

Merge this to your pom.xml:

<project>
  <build>
    <resources>
      <resource>
        <directory>src/main/resources</directory>
        <filtering>true</filtering>
      </resource>
    </resources>

    <plugins>
      <plugin>
        <groupId>org.codehaus.mojo</groupId>
        <artifactId>buildnumber-maven-plugin</artifactId>
        <executions>
          <execution>
            <phase>validate</phase>
            <goals>
              <goal>hgchangeset</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>
</project>

Then make a .properties file in src/main/resources with a property set as ${changeSet}. For example:

revision = ${changeSet}
modificationTime = ${changeSetDate}