Maven release plugin local modifications

You are trying to do a release

cmuser@cmlin01:~$ mvn release:prepare -DreleaseVersion=1.0.0.RC1 -DdryRun=true

And you see an error like:

...
[INFO] [INFO] Working directory: C:workspacesHelloWorldbranchesHelloWorld-1_0component1
[INFO] [INFO] ------------------------------------------------------------------------
[INFO] [ERROR] BUILD ERROR
[INFO] [INFO] ------------------------------------------------------------------------
[INFO] [INFO] Cannot create the build number because you have local modifications :
[INFO] [pom.xml.releaseBackup:unknown]
[INFO] [pom.xml.tag:unknown]
[INFO] [release.properties:unknown]
...

To fix, you need to have SVN ignoring those files.

cmuser@cmlin01:~$ vi /home/cmuser/.subversion/config 
...
global-ignores = pom.xml.* release.properties
...

Now run it again.

mvn release:prepare -DreleaseVersion=1.0.0.RC1 -DdryRun=true