{:title "Condition Recipes" :category :cookbook :index 20 :related [["cookbook/generic" "Generic Recipes"] ["conditions" "Conditions"] ["jobs" "Jobs"]]}

Conditions determine whether a job, or multiple jobs, need to be executed in a build or not. These can be static, depending on values provided at trigger time (e.g. which branch we're on), or dynamic, determined by the results of other jobs.

Applying conditions is not possible in YAML or the other static configuration languages. You have to use Clojure for this.

Branch Condition on a Container Job

Execute a container job only when on a certain branch:

(ns build
  (:require [monkey.ci.api :as m]))

(defn terraform-job [ctx]
  (when (= "terraform" (m/branch ctx))
    (-> (m/container-job "terraform")
        (m/image "docker.io/hashicorp/terraform:latest")
        (m/script ["terraform apply"]))))

Condition on Multiple Jobs

Execute a list of jobs when on a given branch. We use a function to generate the list of jobs in this case:

(ns build
  (:require [monkey.ci.api :as m]))

(defn mvn-job
  "Utility function that creates a basic maven container job with 
   given id and script"
  [id script]
  (-> (m/container-job id)
      (m/image "docker.io/maven:latest")
      (m/script script)))

(def unit-test
  (mvn-job "unit-test" ["mvn verify"]))

(def install
  (-> (mvn-job "install" ["mvn install"])
      (m/depends-on "unit-test")))

(def publish
  (-> (mvn-job "publish" ["mvn publish"])
      (m/depends-on "unit-test")))

(defn jobs [ctx]
  [unit-test     ; Always run this
   (when (m/main-branch? ctx)
     ;; Only run these when on main branch
     [install
      publish])])

Parameter Condition

Only run a job if a parameter has a specific value.

(ns build
  (:require [monkey.ci.api :as m]))

(defn param-job [ctx]
  ;; Only run if TEST_VAR=run!
  (when (= "run!" (get (m/params ctx) "TEST_VAR"))
    (-> (m/container-job "some-job")
        (m/image "docker.io/alpine:latest")
        (m/script ["echo 'I am running'"]))))

Run on Changed Files

Run a job if file matching a regex have changed.

(ns build
  (:require [monkey.ci.api :as m]))

(defn unit-test [ctx]
  ;; Run unit tests if any of the files in `java/` dir have changed
  (when (m/touched? ctx #"^java/.*$")
    (-> (m/container-job "unit-tests")
        (m/image "docker.io/maven:latest")
        ;; Run in the java/ dir
        (m/work-dir "java")
        (m/script ["mvn verify"]))))