Downloads apache maven 3.5.4 into current dir and patches it with Nailgun for faster startup (assumes to be running on ubuntu)

install-maven-gun.sh

#!/bin/bash

MVN_VERSION=3.5.4

curl http://artfiles.org/apache.org/maven/maven-3/$MVN_VERSION/binaries/apache-maven-$MVN_VERSION-bin.tar.gz --output - |tar xz                       
MVN_DIR=$(pwd)/apache-maven-$MVN_VERSION
TMP=/tmp/maven-gun

rm -rf $TMP
mkdir $TMP
cd $TMP

# install and make mailgun and build snapshot jar
git clone git@github.com:uweschaefer/nailgun.git
cd nailgun
make && sudo make install
$MVN_DIR/bin/mvn clean install
cd ..

# build maven-nailgun
git clone git@github.com:uweschaefer/maven-nailgun.git
cd maven-nailgun
$MVN_DIR/bin/mvn clean package
cd ..

# patch maven
cd $MVN_DIR/bin
mv mvn mvn.org

cat mvn.org | sed "s#bin/m2.conf#bin/m2-ng.conf#" > mvn-ng-server
cat m2.conf | sed "s#org.apache.maven.cli.MavenCli#com.github.nigelzor.maven.nailgun.Server#"> m2-ng.conf


cat > mvn << EOF
#!/bin/sh

if ! nc -z localhost 2113 ; then
 echo "Nailgun server not running, starting..." 
 nohup \$(dirname \$0)/mvn-ng-server >/dev/null 2>/dev/null & 

 nc -z localhost 2113 || sleep 1
 if ! nc -z localhost 2113 ; then 
   echo "Nailgun server still not running, falling back to original" 
   mvn.org \$*
   exit \$?
 fi
fi

ng com.github.nigelzor.maven.nailgun.Client \$*
 
EOF
chmod +x mvn
chmod +x mvn-ng-server

cd $MVN_DIR

cp $TMP/nailgun/nailgun-server/target/nailgun-server-0.9.3-SNAPSHOT.jar lib
cp $TMP/maven-nailgun/target/maven-nailgun-1.0-SNAPSHOT.jar lib


cd $MVN_DIR/..
rm -rf $TMP
echo
echo maven $MVN_VERSION patched in $MVN_DIR
echo