Running together with kubernetes-plugin prevents ANSI Color from working

Here’s my simple pipeline DSL:

pipeline {
  agent any

  options {
    ansiColor('xterm')
  }

  stages {
    stage('Run') {
      steps {
          echo '\033[32mcolored output\033[0m'
      }
    }
  }
}

When run on the leader (I changed the no of executors of leader to 1 for this), I get this output:

Reverting back the executors to zero so that the agent run on Kubernetes pods, this is the build output:

[tszmytka]

I finally got to setting up a totally fresh Jenkins instance together with a k8s cluster using the same setup @frezbo provided. This indeed makes logs show raw escape sequences.

After digging a bit deeper and comparing different run results it turned out that the reason lies in kubernetes-plugin and is very similar to #193. The plugin swallows up some ConsoleNotes and prevents ansicolor from working correctly.

A fix should be available in the coming days.

There is a way to get back colored output immediately though (at least for the time being) - install timestamper-plugin (you don’t have to use it in any way). It triggers the workaround implemented for #193 and it will also help in this case until a new version is out.

[Kryan90]

I can also confirm the workaround fixes ansible color output. Thanks!