find env variables for a all builds for a job on jenkins

Question

I need to monitor what are the changes going with a job on jenkins(update the changes to a file). Need to list the env variables of a job. JOB_NAME,BUILD_NUMBER,BUILD_STATUS,GIT_URL for that build(all the builds of a job). I didn't find out a good example with the groovy. What is the best way to fetch all the info?

Answer 1

build.getEnvironment(listener) should get you what you need

Answer 2

Depending on what you would like to achieve there are at least several approaches to retrieve and save environment variables for:

• current build
• all past builds

Get environments variables for current build (from slave)

Execute Groovy script

// Get current environment variables and save as 
// a file in $WORKSPACE.
new File(".",'env.txt').withWriter('utf-8') { writer ->
  System.getenv().each { key, value ->
    writer.writeLine("${key}:${value}")
  }
}

Using Groovy Plug-in.

Get environment variables for current build (from master)

Execute system Groovy script

// Get current environment variables and save as 
// a file in $WORKSPACE.
import hudson.FilePath


def path = "env-sys.txt" 
def file = null

if (build.workspace.isRemote()) {
   file = new FilePath(build.workspace.channel, build.workspace.toString() + "/" + path)
} else {
   file = new FilePath(build.workspace.toString() + "/" + path)
}

def output = ""
build.getEnvironment(listener).each { key, value ->
  output += "${key}:${value}\n"
}
file.write() << output

Using Groovy Plug-in.

Environment variables returned by Groovy scripts are kept in map. If you don't need all of them, you can access individual values using standard operators/methods.

Get environment variables for all past builds (from master)

This approach expecst that you have installed EnvInject Plug-in and have access to $JENKINS_HOME folder:

$ find . ${JENKINS_HOME}/jobs/[path-to-your-job] -name injectedEnvVars.txt
...

ps. I suspect that one could analyze EnvInject Plug-in API and find a way to extract this information directly from Java/Groovy code.

Using EnvInject Plug-in.

To look for only specific variables you can utilize find, grep and xargs tools .

Answer 3

You can use below script to get the Environment Variables

def thread = Thread.currentThread()
def build = thread.executable
// Get build parameters
def buildVariablesMap = build.buildVariables 
// Get all environment variables for the build
 def buildEnvVarsMap = build.envVars
 String jobName = buildEnvVarsMap?.JOB_NAME // This is for JOB Name env variable.

Hope it helps!