Deploy Button on Olimex A20-OLinuXino-LIME with Jenkins build status and capistrano deploy. More information here: http://cvuorinen.net/2015/10/building-a-deploy-button/

deploy.py

#!/usr/bin/env python

import os
import time
from pyA20Lime.gpio import gpio
from pyA20Lime.gpio import port
from autojenkins import Jenkins

### configration parameters

JENKINS_URL = 'http://your.jenkins.host'
JENKINS_USER = 'username'
JENKINS_PASSWORD = 'password-or-apikey'
JENKINS_JOB = 'jenkins-job-name'
CHECK_INTERVAL = 120
PROJECT_PATH = '/path/to/project'
DEPLOY_COMMAND = 'git pull && cap deploy:migrations'

RED_LED = port.PG9
GREEN_LED = port.PC7
BUTTON = port.PE11

### end configuration

def main():
    init()

    build = Build(
        Jenkins(JENKINS_URL, auth=(JENKINS_USER, JENKINS_PASSWORD))
    )
    blinkOn = False

    while True:
        if buttonPressed() and build.success():
            deploy()

        build.check()

        blinkOn = setLeds(build, blinkOn)

        time.sleep(1)

def setLeds(build, blinkOn):
    if build.success():
        onLed = GREEN_LED
        offLed = RED_LED
    else:
        onLed = RED_LED
        offLed = GREEN_LED

    ledOff(offLed)

    # blink the LED when build in progress
    if build.building() and blinkOn:
        ledOff(onLed)
    else:
        ledOn(onLed)

    return not blinkOn

def deploy():
    # button must be pressed for two seconds to start deploy
    log("deploy.sleep")
    time.sleep(2)

    if not buttonPressed():
        log("deploy.return")
        return

    log("deploy.start")
    ledOn(RED_LED)
    ledOn(GREEN_LED)

    os.system(DEPLOY_COMMAND)

    ledOff(RED_LED)
    ledOff(GREEN_LED)

def init():
    log('init')

    gpio.init()

    gpio.setcfg(RED_LED, gpio.OUTPUT)
    gpio.pullup(RED_LED, gpio.PULLUP)
    gpio.setcfg(GREEN_LED, gpio.OUTPUT)
    gpio.pullup(GREEN_LED, gpio.PULLUP)

    gpio.setcfg(BUTTON, gpio.INPUT)
    gpio.pullup(BUTTON, gpio.PULLUP)

    # set LEDs on for one second to signal everything is OK
    ledOn(RED_LED)
    ledOn(GREEN_LED)

    time.sleep(1)

    ledOff(RED_LED)
    ledOff(GREEN_LED)

    os.chdir(PROJECT_PATH)

def buttonPressed():
    return not gpio.input(BUTTON) == 1

def ledOn(ledPort):
    gpio.output(ledPort, gpio.HIGH)

def ledOff(ledPort):
    gpio.output(ledPort, gpio.LOW)

def log(message):
    print time.strftime('[%Y-%m-%d %H:%M:%S] ') + message

class Build(object):
    def __init__(self, jenkins):
        self._jenkins = jenkins
        self._lastCheck = 0
        self._lastResult = {'result': '', 'building': False}

    def check(self):
        if self._shouldCheck():
            self._checkBuild()

    def success(self):
        return self._lastResult['result'] == 'SUCCESS'

    def building(self):
        return self._lastResult['building']

    def _shouldCheck(self):
        return (time.time() - self._lastCheck) > CHECK_INTERVAL

    def _checkBuild(self):
        log("Build._checkBuild")
        self._lastCheck = time.time()

        try:
            self._lastResult = self._jenkins.last_result(JENKINS_JOB)
        except Exception:
            self._lastResult = {'result': 0, 'building': True}

        log("Build._lastResult: " + str(self._lastResult))

main()