Execute Jenkins pipeline step basing on changeset

Suppose you have a git repository, and want to connect it to Jenkins to start a CI/CD pipeline when some specific files are changed.

You can do it checking the changeset. Let's see some examples.

Suppose your repository has this structure:

nodejs-example

├── Dockerfile

├── configurations

│   ├── dev

│   │   └── config.yaml

│   └── prod

│       └── config.yaml

├── index.js

├── package.json

If you want to do a build step only if index.js changes, then do:

stage("Build step example") {

  when{

    changeset "index.js"

  }

  steps {

    script {

      sh 'npm i'

    }

  }

}

If you want to do a build step only if a file inside configurations folder changes, then do:

stage("Build step example") {

  when{

    anyOf{

      changeset "configurations/**/*.yaml"

    }

  }

  steps {

    script {

      sh 'npm i'

    }

  }

}

If you want to do a build step only if all the files in configurations folder change, then do:

stage("Build step example") {

  when{

    allOf{

      changeset "configurations/**/*.yaml"

    }

  }

  steps {

    script {

      sh 'npm i'

    }

  }

}

If you want to do a build step only if none of the files in configurations folder change, then do:

stage("Build step example") {

  when{

    not{

      anyOf{

        changeset "configurations/**/*.yaml"

      }

    }

  }

  steps {

    script {

      sh 'npm i'

    }

  }

}