clean jenkins master and slave workspace( fix https://issues.jenkins-ci.org/browse/JENKINS-2111 )

clean_jenkins_workspace.py

#!/usr/bin/env python
#-*-coding:utf-8-*-
import urllib, json , os
from shutil import rmtree

url = 'http:/yourjenkinsbaseurl/api/python?pretty=true'
jenkins_workspace_path = '/data/jenkins/workspace/'

data =  eval(urllib.urlopen(url).read())
jobnames = []
for job in data['jobs']:
    jobnames.append(job['name'])


ws = os.listdir(jenkins_workspace_path)

for workspace in ws:
    if workspace not in jobnames:
      workspace_path = os.path.join(jenkins_workspace_path, workspace)
        print "remove dir: %s " % workspace_path
        rmtree(workspace_path)

FYI, this doesn't work with the Cloudbees folder plugin. Or the api/python URL doesn't. See https://gist.github.com/jhoblitt/5f812cba39f0ec3c2e01f00d97d379a2