Generates a version number from your maven version, adding on commits since branching, and the hash of the commit. Good for continuous integration.

version.sh

#!/bin/bash

export args="$*"

# Check whether in quiet mode.
export quiet=false
if grep -q '\-q' <<<$args; then
	export quiet=true
fi

function log {
	if ! $1; then
		echo $2
	fi
}

if [ ! -f pom.xml ]; then
	log $quiet "Script needs to be run in project root."
	exit 1
fi

# Get current maven version.
export VER_MVN=`mvn help:evaluate \
	-Dexpression=project.version \
	| grep '^[0-9][0-9A-Za-z\.\-]*$'`
	log $quiet "-> Maven version extracted: $VER_MVN."

if ! grep -q "SNAPSHOT$" <<<$VER_MVN; then
	log $quiet "Maven version must be SNAPSHOT"
	exit 2
fi

if [ -d ".git" ]; then

	# Get master revision.
	export GIT_MASTER_REV=`git rev-list --count origin/master`
	log $quiet "-> Git master revision extracted: $GIT_REV."

	# Get branch revision. If master, should be 0.
	export GIT_BRANCH_REV=`git rev-list --count HEAD ^origin/master`
	log $quiet "-> Git branch revision extracted: $GIT_REV."

	# Get current git SHA
	export GIT_HASH=`git rev-parse --short HEAD`
	log $quiet "-> Git hash extracted: $GIT_HASH."

	# Construct build version.
	export BUILD_VERSION="$GIT_MASTER_REV.$GIT_BRANCH_REV.$GIT_HASH"
	log $quiet "-> Build version generated as: $BUILD_VERSION."

elif [ -d ".svn" ]; then

	# Get current svn branch
	export SVN_BRANCH=`svn info \
		| grep '^Relative URL:' \
		| sed 's/.*\///'`
	log $quiet "-> SVN branch extracted: $SVN_BRANCH."

	# Get current svn rev
	export SVN_VERSION=`svn info \
		| grep '^Revision:' \
		| sed 's/Revision: //'`
	log $quiet "SVN revision extracted: $SVN_VERSION."

	# Construct build version
	export BUILD_VERSION="$SVN_BRANCH-$SVN_VERSION"
	log $quiet "-> Build version generated as: $BUILD_VERSION."

else
	log $quiet "Directory not under source control."
	exit 3
fi

# Replace "SNAPSHOT" with generated version number.
export FINAL_VERSION=`log $quiet $VER_MVN | sed "s/SNAPSHOT/$BUILD_VERSION/"`
log $quiet "-> Creating final build version: $FINAL_VERSION."

if grep -q "\-\-exec" <<<$args; then

	# Set maven version appropriately.
	mvn versions:set versions:commit -DnewVersion="${FINAL_VERSION}"

fi

echo $FINAL_VERSION