release:branch and release:perform overwrites existing branch/version

Create a branch from the trunk using command
mvn -DdevelopmentVersion=0.0.3-SNAPSHOT -DbranchName=testBranch release:branch

The above command creates a branch under svn/branches/testBranch. then perform a release

mvn release:prepare release:perform with release version 1.0.0

Creates artifacts with version 1.0.0 and uploads them to the repository.

I run the same command again the next day
mvn -DdevelopmentVersion=0.0.3-SNAPSHOT -DbranchName=testBranch release:branch
mvn release:prepare release:perform

It overwrites the files in the existing branch svn/branches/testBranch and also overwrites the existing released artifacts in the repository.

The release:branch should thrown an error saying branch with the name already exists or there should be an overwrite parameter (with default false) to indicate if we want to overwrite.

Error should be thrown if the release version for artifacts already exists in the repository. This check should happen under release:prepare phase.