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These jenkins.osmocom.org job definitions, managed by
https://docs.openstack.org/infra/jenkins-job-builder/index.html[Jenkins Job Builder]

*Prepare:*

Install jenkins-job-builder:

For debian 9, see troubleshooting below. Otherwise:

  apt-get install jenkins-job-builder

Have a jenkins-job-builder.ini file. One of

    ~/.config/jenkins_jobs/jenkins_jobs.ini
    /etc/jenkins_jobs/jenkins_jobs.ini

or place one in here and pass it to jenkins-jobs using the --conf file.

Make sure the file not world readable to minimally safeguard your jenkins password.
Instead of using your jenkins password, use an *API Token*. To retrieve your token go
to Jenkins via a Webbrowser, click on your Username in the right corner, click on configure,
click on *Show API Toke...*.

jenkins_jobs.ini:

    [jenkins]
    user=my_user_name
    password=my_api_token
    url=https://jenkins.osmocom.org/jenkins

and

    chmod go-rwx jenkins_jobs.ini

*Update a single job on jenkins.osmocom.org:*

    jenkins-jobs --conf jenkins_jobs.ini update gerrit-verifications.yml gerrit-osmo-msc

NOTE: when you supply a name not defined in that yml file, you will not get an
error message, just nothing will happen.

*Update all jobs of one file:*

    jenkins-jobs --conf jenkins_jobs.ini update gerrit-verifications.yml

*Update all jobs in all files:*

    jenkins-jobs --conf jenkins_jobs.ini update ./

*Troubleshooting:*

- 'jenkins.JenkinsException: create[gerrit-osmo-msc] failed'

jenkins.osmocom.org is not reachable, or URL in the config file is erratic.
Make sure it is exactly

    url=https://jenkins.osmocom.org/jenkins

- newlines:

Use 'key: |' to keep new lines in multiline values, e.g.:
  - shell: |
      echo hello
      echo world

See also:
* https://yaml-multiline.info/
* https://stackoverflow.com/a/21699210

- jobs named on cmdline are not updated:

Make sure the job name is correct, or just issue an entire yml file without
individual job names.

Also be aware that jobs are only actually updated when anything changed.

- debian 9

For jenkins-job-builder to work on debian 9:

add 'testing' to /etc/apt/sources.list like

  deb http://ftp.de.debian.org/debian/ testing main

then

    sudo apt-get update
    sudo apt-get -t testing install python-jenkins
    sudo apt-get install jenkins-job-builder

and make sure to *not* pick the python3 versions
(or you'll need to add catching of HTTPError to jenkins/__init__.py in
'def maybe_add_crumb')

*Jenkins labels*

The build jobs are using labels to specify on which nodes the job should be run.
Please use the following labels

- osmocom-master-debian8: are nodes which can build osmocom-master and is a debian 8
- osmocom-master-debian9: are nodes which can build osmocom-master and is a debian 9
- osmocom-gerrit-debian8: are nodes which can build osmocom-gerrit and is a debian 8
- osmocom-gerrit-debian9: are nodes which can build osmocom-gerrit and is a debian 9