The current version of the maven buildnumber plugin does not yet support the git scm backend. This makes it harder to get the git sha for the current build (often a snapshot build) into the MANIFEST.MF file.
However - if all you need is a file somewhere in the deployed artifact that contains the sha then this workaround may help until the git scm is supported by buildnumber:
<plugin> <groupId>org.codehaus.mojo</groupId> <artifactId>exec-maven-plugin</artifactId> <version>1.1</version> <executions> <execution> <phase>compile</phase> <goals> <goal>exec</goal> </goals> </execution> </executions> <configuration> <executable>git</executable> <arguments> <argument>log</argument> <argument>--pretty=format:%H</argument> <argument>-n1</argument> </arguments> <outputFile>target/classes/gitsha.txt</outputFile> </configuration> </plugin>
This will put a file in the artifact containing the sha. You will need git in your path for this to work.