Release a branch from master + updating maven POM file version to new version for multi module project.

release.sh

#!/bin/bash

# current Git branch
branch=$(git symbolic-ref HEAD | sed -e 's,.*/\(.*\),\1,')

# current project name
projectName=$(git config --local remote.origin.url|sed -n 's#.*/\([^.]*\)\.git#\1#p')

# establish master branch name variables
masterBranch=$branch

# checkout to master branch, this will break if the user has uncommited changes
git checkout $masterBranch

# master branch validation
if [ $branch = "master" ]; then
	echo "Enter the release version number"

	read versionNumber

	# v1.0.0, v1.7.8, etc..
	versionLabel=v$versionNumber

	# establish branch and tag name variables
	releaseBranch=$versionNumber
	tagName=$versionLabel

	echo "Started releasing $versionLabel for $projectName ....."

	# pull the latest version of the code from master
	git pull

	# create empty commit from master branch
	git commit --allow-empty -m "Creating Branch $releaseBranch"

	# create tag for new version from -master
	git tag $tagName

	# push commit to remote origin
	git push

	# push tag to remote origin
	git push --tags origin 
	 
	# create the release branch from the -master branch
	git checkout -b $releaseBranch $masterBranch

	# push local releaseBranch to remote
	git push -u origin $releaseBranch

	echo "$versionLabel is successfully released for $projectName ...."
	echo "Checking out into $masterBranch again, where it all started...... :)"

	# checkout to master branch
	git checkout $masterBranch

	# pull the latest version of the code from master
	git pull

	echo "Enter new version number for $projectName"	
	read newVersionNumer

	# Update Maven version to next release number
	mvn versions:set -DnewVersion=$newVersionNumer -DgenerateBackupPoms=false
	
	# Commit setting new master branch version	
	git commit -a -m "Setting master branch version to $newVersionNumer"

	# push commit to remote origin
	git push
	
	echo "Maven POM File Version is set to new version $newVersionNumer"	
	echo "Bye!"
else 
	echo "Please make sure you are on master branch and come back!"
	echo "Bye!"
fi

You can comment lines from line number 54 to 72 if Maven version update part is not necessary.