Set up update-jenkins-jobs on PR Jenkins.

hack/jenkins/job-configs/kubernetes-jenkins-pull/kubernetes-update-jenkins-jobs.yaml

@@ -0,0 +1,14 @@
+- job:
+    name: kubernetes-update-jenkins-jobs
+    description: 'Update Jenkins jobs based on configs in https://github.com/kubernetes/kubernetes/tree/master/hack/jenkins/job-configs. Test owner: spxtr.'
+    triggers:
+        - timed: 'H/15 * * * *'
+    builders:
+        - shell: |
+            curl -fsS https://raw.githubusercontent.com/kubernetes/kubernetes/master/hack/jenkins/update-jobs.sh > update-jobs.sh
+            chmod +x update-jobs.sh
+            ./update-jobs.sh "hack/jenkins/job-configs:hack/jenkins/job-configs/kubernetes-jenkins-pull"
+    publishers:
+      - email-ext:
+          recipients: spxtr@google.com
+

hack/jenkins/job-configs/kubernetes-jenkins/kubernetes-update-jenkins-jobs.yaml

@@ -4,7 +4,10 @@
     triggers:
         - timed: 'H/15 * * * *'
     builders:
-        - shell: 'curl -fsS https://raw.githubusercontent.com/kubernetes/kubernetes/master/hack/jenkins/update-jobs.sh | /bin/bash -'
+        - shell: |
+            curl -fsS https://raw.githubusercontent.com/kubernetes/kubernetes/master/hack/jenkins/update-jobs.sh > update-jobs.sh
+            chmod +x update-jobs.sh
+            ./update-jobs.sh "hack/jenkins/job-configs:hack/jenkins/job-configs/kubernetes-jenkins"
     publishers:
       - email-ext:
           recipients: spxtr@google.com

hack/jenkins/update-jobs.sh

@@ -14,13 +14,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-# Update all Jenkins jobs in a folder. If no folder is provided in $1,
-# defaults to hack/jenkins/job-configs.
+# Update all Jenkins jobs in a folder specified in $1. It can be the union of
+# multiple folders separated with a colon, like with the PATH variable.
 
 if [[ $# -eq 1 ]]; then
   config_dir=$1
 else
-  config_dir="hack/jenkins/job-configs"
+  echo "Usage: $0 <dir>" >&2
+  exit 1
 fi
 
 # Run the container if it isn't present.