“When” is the conditional derivate of the Jenkins declarative pipeline. Just like “IF” conditions, “when” will have the one or more condition statement. This can be either for from the user input or from the Built-in conditions. “When” condition can be placed before “Agent” in stage or before input directive.
Jenkins “when” Directive: Execution of the pipeline stages can be controlled with conditions. These conditions must be defined in the when block within each stage. Jenkins supports a set of significant conditions that can be defined to limit stage execution. Each when block must contain at least one condition.
The next thing we wanted the answer to was: how do I implement conditional operations in Jenkins pipeline?
One answer is, unlike Freestyle jobs, implementing conditional operations in Jenkins Pipeline is trivial, but matching the behavior of complex conditional build steps will require a bit more care. The Conditional Build. Step plugin lets users add conditional logic to Freestyle jobs from within the Jenkins web UI. It does this by:.
How do I write a pipeline code in Jenkins?
Pipeline code can be written directly in the Jenkins Web UI or in any text editor. It is a full-featured programming language, which gives users access to much broader set of conditional statements without the restrictions of UI-based programming. So, taking the example above, the Pipeline equivalent is:.
I as mentioned previously, Jenkins Pipeline is a suite of plugins that supports implementing and integrating continuous delivery pipelines into Jenkins. Pipeline provides an extensible set of tools for modeling simple-to-complex delivery pipelines “as code” via the Pipeline DSL.
Jenkins Declarative Pipeline is very flexible and powerful. “when” condition is a good example, we can use “when” to support conditional staging, i., and e. For dev environment, we don’t want to deploy.
Step is a single task that tells Jenkins what exactly needs to be done. For example, setting an environment variable can be done in a step, executing a build command can also be a step. On the whole, a Jenkins Pipeline constitutes a series of steps.
A continuous delivery pipeline is an automated expression of your process for getting software from version control right through to your users and customers. Jenkins Pipeline provides an extensible set of tools for modeling simple-to-complex delivery pipelines “as code”.
It is a combination of plugins that support the integration and implementation of continuous delivery pipelines using Jenkins. In other words, a Jenkins Pipeline is a collection of jobs or events that brings the software from version control into the hands of the end users by using automation tools.
There is definitely a learning curve with Jenkins Pipelines, so don’t get discouraged 🙂 I recommend checking out Jenkins’ official documentation as well as the Pipeline Steps Reference page to anyone getting started with Jenkins Pipelines. FYI, stage s without a block argument is deprecated; you should define stage s as follows:.
An answer is that as discussed in the Defining a Pipeline in SCM, a Jenkinsfile is a text file that contains the definition of a Jenkins Pipeline and is checked into source control. Consider the following Pipeline which implements a basic three-stage continuous delivery pipeline.
What is an example of when block in Jenkins?
An example of this is that releases to Production can only be done from the production branch, or that deployments to Acceptance can only occur when they are approved by a specific user. This is where conditions shine, and they are implemented in Jenkins Pipelines as a when block.
What is the use of a skip stage in Jenkins?
Usage: it is a drop-in replacements for a stage, with condition added. Example: unless dockerize is true, both stages are hidden (note: stage is inside stage). Otherwise build, but publish conditionally (e. g. not in bugfix/feature branch), marking stage as skipped.
How do I skip checking code from source control in Jenkins?
Inside a stage, the steps in the options directive are invoked before entering the agent or checking any when conditions. Skip checking out code from source control by default in the agent directive. For example: options { skip, default Checkout () } Set a timeout period for this stage, after which Jenkins should abort the stage.