Gitbucket (for JAR releases from: https://github.com/takezoe/gitbucket, located in /home/ubuntu/gitbucket/gitbucker.war).

etc-init-gitbucket.conf

#!upstart
description "gitbucket"

env USER=ubuntu
env PID=/var/run/gitbucket.pid
env STDOUT=/var/log/gitbucket/gitbucket.log
env STDERR=/var/log/gitbucket/gitbucket.err

start on (local-filesystems and net-device-up IFACE!=lo)
stop on [!12345]

respawn

console log

script
    mkdir -p "$(dirname $STDOUT)"
    chown -R $USER:$USER "$(dirname $STDOUT)"
    echo $$ > $PID
    cd "/home/${USER}/gitbucket"
    exec sudo -u "${USER}" java -jar gitbucket.war 1>>$STDOUT 2>>$STDERR
end script

post-stop script
    rm -f $PID
    exec sleep 5
end script