Gitlab Jenkins Build Job

.gitlab-ci.yml

image: "docker:19.03.0-dind"

stages:
  - build

variables:
  JENKINS_USER: JENKINS_USER_NAME
  JENKINS_TOKEN: JENKINS_USER_ACCESS_TOKEN
  JENKINS_JOB_URL_DEV: JENKINS_JOB_URL
  INSTANCE_IP: SOME_DEPLOY_INSTANCE

before_script:
  - df
  - cat /etc/resolv.conf
  - cat /etc/hosts
  - uname -a
  - docker -v
  - docker-compose --version
  - git --version

jenkins-dev-build:
  stage: 'build'
  only:
    refs:
      - develop
      - ci
  tags:
    - "jenkins"
  script:
    - echo "Starting jenkins job..."
    
    # get the last build's json output
    - lastjson=$(curl --silent --user $JENKINS_USER:$JENKINS_TOKEN $JENKINS_JOB_URL_DEV/lastBuild/api/json)
    - checkjson=$lastjson
    - lastjobid=$(echo $lastjson | perl -nle 'm/"id":"?(\d+)"?,?/; print $1')
    - jobid=$lastjobid

    # create a new jenkins job, with parameters
    - curl -i -X POST --user $JENKINS_USER:$JENKINS_TOKEN $JENKINS_JOB_URL_DEV/buildWithParameters?BPM_BRANCH=$CI_COMMIT_REF_NAME&Instance_Ip=$INSTANCE_IP
    - sleep 3

    # check to see if the job has been started by checking the response from lastBuild every 1 second
    # continue until we get a different response than what we have in $checkjson
    - >
        while [ "$checkjson" == "$lastjson" ] | [ "$lastjobid" == "$jobid" ];
        do
          echo "Waiting for new job to register..."
          lastjson=$(curl --silent --user $JENKINS_USER:$JENKINS_TOKEN $JENKINS_JOB_URL_DEV/lastBuild/api/json)
          jobid=$(echo $lastjson | perl -nle 'm/"id":"?(\d+)"?,?/; print $1')
          sleep 1
        done
        
    # fetch the json from the jobid we found
    # repeat every 10 seconds until the job is finished (or has a different result value other than null)
    # every iteration, fetch the console output for this job id and show the text not previously shown in the console
    - echo "Jenkins job id ${jobid} is running..."
    - echo "Waiting for jenkins job id ${jobid} output..."
    - currentoutput=""
    - loopval=null
    - >
        while [ "$loopval" == "null" ];
        do
          sleep 10
          lastjson=$(curl --silent --user $JENKINS_USER:$JENKINS_TOKEN $JENKINS_JOB_URL_DEV/${jobid}/api/json)
          loopval=$(echo $lastjson | perl -nle 'm/"result":"?([^,"\s]+)"?,?/; print $1')
          outputidx=${#currentoutput}
          currentoutput=$(curl --silent -i -X POST --user $JENKINS_USER:$JENKINS_TOKEN $JENKINS_JOB_URL_DEV/${jobid}/consoleText)
          if [ ${#currentoutput} > $outputidx ]; then
            echo -e "${currentoutput:$outputidx:$((${#currentoutput} - outputidx))}"
          fi
        done
    - >
        if [ "$loopval" != "SUCCESS" ]; then
          echo "Invalid result from jenkins job id ${jobid}: ${loopval}"
          echo "Build Failed!"
          exit 1
        fi