Apache Ant Script that can build a working Liferay Bundle from a Liferay Portal given the app.properties are configured correctly.

app.properties

#For resetting database
sql.prog=C:/Program Files/MySQL/MySQL Server 5.7/bin/mysql.exe
sql.databaseName=lportal

#jar files to be added
sql.jarPath=L:/ImportantFiles

#Liferay portal home
portal.homefolder=L:/private/7.0.x-portal
#Liferay bundle home
bundle.homefolder=L:/apacheTestBundle/liferay-dxp-digital-enterprise-7.0-sp6
#L:/private/liferay-dxp-digital-enterprise-7.0-nightly

#Computer name
computer.name=Kyle-Miho

#servertype
server.type=tomcat
server.foldername=tomcat-8.0.32

#portal-ext.properties properties
portalext.driver=com.mysql.jdbc.Driver
portalext.url=jdbc:mysql://localhost/lportal?useUnicode=true&characterEncoding=UTF-8&useFastDateParsing=false
index.on.startup=true
setup.wizard.enabled=false

#Location of ant relative to portal home
antcontrib.location=${portal.homefolder}/lib/development

app.xml

<?xml version="1.0"?>
<project name="app" default="">
	<!--File includes-->
	<property file="app.properties"/>
	<import file="build.xml"/>
	<import file="build-dist.xml"/>

	<taskdef resource="net/sf/antcontrib/antlib.xml">
		<classpath>
			<pathelement location="${antcontrib.location}/ant-contrib.jar" />
		</classpath>
	</taskdef>

	<!--Plain Portal + pre-reqs -> ant all -> post-reqs -> Ready to execute bundle -->
	<target name="all">
		<antcall target="pre-ant-all"/>
		<ant antfile="build.xml" target="all"/>
		<antcall target="post-ant-all"/>
	</target>

	<!--Tomcat dependencies required before ant all compilation-->
	<target name="pre-ant-all">
		<antcall target="create-app-server-prop"/>
		<antcall target="create-build-prop"/>
		<antcall target="unzip-appserver"/>
	</target>

	<!--Attempts to execute ant -f build-dist.xml unzip-tomcat-->
	<target name="unzip-appserver">
		<sleep seconds="2"/>
		<ant antfile="build-dist.xml" target="unzip-tomcat" />
	</target>

	<!--Create app-server.Kyle-Miho.properties files-->
	<target name="create-app-server-prop">
		<echo>Searching for app-server.${computer.name}.properties</echo>
		<if>
			<available file="app.server.${computer.name}.properties"/>
			<then>
				<echo>app-server.${computer.name}.properties found! Deleting old version.</echo>
				<delete file="app.server.${computer.name}.properties"/>
			</then>
			<else>
				<echo>portal-ext.properties not found! Creating fresh file.</echo>
				<touch file="app.server.${computer.name}.properties"/>
			</else>
		</if>

		<echo>Writing to app-server.${computer.name}.properties</echo>
		<echo file="app.server.${computer.name}.properties" append="true">
app.server.parent.dir=${bundle.homefolder}
app.server.type=${server.type}
		</echo>
		<echo>Writing complete!</echo>
	</target>

	<!--Create build.Kyle-Miho.properties files-->
	<target name="create-build-prop">
		<echo>Searching for build.${computer.name}.properties</echo>
		<if>
			<available file="build.${computer.name}.properties"/>
			<then>
				<echo>app-server.${computer.name}.properties found! Deleting old version.</echo>
				<delete file="build.${computer.name}.properties"/>
			</then>
			<else>
				<echo>portal-ext.properties not found! Creating fresh file.</echo>
				<touch file="build.${computer.name}.properties"/>
			</else>
		</if>

		<echo>Writing to build.${computer.name}.properties</echo>
		<echo file="build.${computer.name}.properties" append="true">
app.server.dir=${bundle.homefolder}/tomcat-8.0.32
javac.compiler=modern
		</echo>
		<echo>Writing complete!</echo>
	</target>

	<!--Tomcat dependencies required after ant all compilation-->
	<target name="post-ant-all">
		<antcall target="reset-db"/>
		<antcall target="reset-data-deploy"/>
		<antcall target="create-portal-ext-prop"/>
		<antcall target="replace-mysql-jar"/>
	</target>

	<!-- Deletes and creates a fresh MYSQL database -->
	<target name="reset-db">
		<echo>Resetting Database...</echo>
		<exec executable="${sql.prog}">
			<arg value="-e"/>
			<arg value="drop database if exists ${sql.databaseName}; show databases; create database ${sql.databaseName} char set utf8; show databases;"/>
		</exec>

		<echo>Resetting successful!</echo>
	</target>

	<!-- Deletes Data and Deploy Folders -->
	<target name="reset-data-deploy">
		<echo>Deleting data folder</echo>
		<delete dir="${bundle.homefolder}/data"/>

		<echo>Deleting home folder</echo>
		<delete dir="${bundle.homefolder}/deploy"/>

		<echo>Finished deleting folders</echo>
	</target>
	<!-- Searches for and updates portal-ext.properties-->
	<target name="create-portal-ext-prop">
		<echo>Searching for portal-ext.properties</echo>
		<if>
			<available file="${bundle.homefolder}/${server.foldername}/webapps/ROOT/WEB-INF/classes/portal-ext.properties"/>
			<then>
				<echo>portal-ext.properties found! Deleting old version.</echo>
				<delete file="${bundle.homefolder}/${server.foldername}/webapps/ROOT/WEB-INF/classes/portal-ext.properties"/>
			</then>
			<else>
				<echo>portal-ext.properties not found! Creating fresh file.</echo>
				<touch file="${bundle.homefolder}/${server.foldername}/webapps/ROOT/WEB-INF/classes/portal-ext.properties"/>
			</else>
		</if>

		<echo>Writing to portal-ext.properties</echo>
		<echo file="${bundle.homefolder}/${server.foldername}/webapps/ROOT/WEB-INF/classes/portal-ext.properties" append="true">
# this will turn off an annoying message; you'll want this line
plugins.notification.enabled=false

# these next lines will configure the MySQL connections
jdbc.default.jndi.name=

# dbname is where you specific the name of the database; lportal is the default name
jdbc.default.driverClassName=${portalext.driver}
jdbc.default.url=${portalext.url}
jdbc.default.username=
jdbc.default.password=

# this will set your home directory, which locally stores your data, deploy, and logs folders

browser.launcher.url=

# this will allow Liferay to reindex stuff when starting up
index.on.startup=${index.on.startup}

mail.session.jndi.name=

axis.servlet.hosts.allowed=

tunnel.servlet.hosts.allowed=

setup.wizard.enabled=${setup.wizard.enabled}
		</echo>
		<echo>Writing complete!</echo>
	</target>

	<target name="replace-mysql-jar">
		<echo>Updating mysql.jar in ${bundle.homefolder}/${server.foldername}/lib/ext</echo>
		<copy file="${sql.jarPath}/mysql.jar" todir="${bundle.homefolder}/${server.foldername}/lib/ext"/>
	</target>

</project>