I'm using the polling scm (git) plugin to trigger jobs. I've set the quiet period to 30 seconds for a specific job.
When I commit:
the job indeed sits in the "build queue" for 30 seconds.
I cancel it, and it goes away
However the polling scm plugin seems to re-trigger and then build the job. at the next poll period
How do I cancel the job without letting it start, and then canceling it?
This is not possible with timer triggered scm polling.
The reason is, that on each poll jenkins will compare the remote to the local revision and will find out that the remote revision it is newer thus triggering a build. Aborting the build before a checkout or update doesnt change the local revision so it will retrigger a build on the next poll triggered by the timer.
A solution is, to make use of post-commit hooks.
Post-commit hooks are configured on the remote machine and are basically scripts that run after a commit has happened. As you can trigger a poll by calling some url on your jenkins server, its merely some configuration on the scm server to trigger a poll exactly after a commit has happened. That way, after an abort, jenkins will only trigger a poll on the next commit to the repository.
Theres usually some hints how to setup this in the documentation of the various scm plugins, i.e. the git plugin.
Related
I think I've done the hard part already: the Github webhook after a push always returns a success message.
I can build manually. But it never builds after the push, because "polling" never happens.
Both the GitHub Hook Log and Git Polling Log say "Polling has not yet run".
Here is my configuration:
Branches to build: refs/heads/checkJenkins
Build Triggers: GitHub hook trigger for GITScm polling, Poll SCM
Build: Execute shell: 'git pull'
Any ideas on how to get the polling started?
A side question: which should be doing the polling when I'm using the webhook in github: the "GITScm polling" or "Poll SCM"? Can I delete one of those settings?
Poll SCM is to scan the repository for changes at regular intervals as specified by the cron under Schedule. So this option is redundant.
Now coming to the hook, is it configured to deliver everything or just the push event? You can hit http://<jenkins_url>/log/all in your browser to see the system log while pushing changes. Towards the bottom of this log, see if Jenkins has received the hook and poked the job. If the hook is not received, reconfigure it at GitHub to send the appropriate events. Else, delete and recreate the job as sometimes Jenkins fails to register a new job to poke on receiving events and at other times a new job itself doesn’t respond to poking.
It's enough to keep only GitHub hook trigger for GITScm polling on, because this is the right option for conditional triggers (following git push as opposed to scheduled as a cron job, i.e. proper polling 1).
As for ideas on how to get the triggering (not polling) started, consult my "pre-flight checklist" here, because it's not a trivial matter.
Side note: feel free to report it to the Jenkins Github Plugin devs if you also think that the word "polling" is misplaced in this option (as per the definition of this term).
Windows Server 2016, Jenkins 2.107.1. We have GitHub repositories, Git repositories not in GitHub, and CVS repositories. This link...Can I restrict poll SCM job to be run only once in a day?, tells me that I can set the polling to happen only once a day (which is all that we want, in that the coders can check in, up to a certain time). It does not tell me how to exit out (not to continue with the rest of the build steps), if there are no changes (and, send out a message that there are no changes and thus will be no build tonight). We are not using pipeline. Thanks.
the poll scm plugin in by default will not run the job if there are no SCM changes, also you will get GIT polling logs to see the detailed information
I inherited a project set up to use Jenkins. I set the trigger to poll SCM every 5 minutes and disabled the pre-existing build remotely trigger. So now the only trigger set for Jenkins is to poll SCM every 5 minutes. However jenkins is building the project everytime the project repo is updated and NOT on polling. The polling log specifically says that it won't build (due to the author of the commit being in the excluded list) but the project builds anyway, unrelated to the polling. There are no other triggers set.
I didn't find any scripts anywhere that could explain this behaviour.
I have development code repository at bitbucket and another test script code repository at bitbucket. Now I have setup a Jenkins job by linking test code repository. Is there any way to trigger jenkins job automatically on change in development repository ?
You can add the BitBucket Plugin to your Jenkins instance. It will allow you to configure a webhook in BitBucket that will then trigger any Jenkins job listening for that webhook. The plugin's page has a detailed breakdown, but the basics are;
In your repo in BitBucket, create a new Webhook using your Jenkins' url. I believe the url is generally http://[your jenkins url]/bitbucket-hook/
Make the trigger a repo push.
In your Jenkins job, check the box "Build when a change is pushed to BitBucket" under the Build Triggers section.
Now any time you commit to the repo you created the Webhook on, that Jenkins job will be run.
You can also limit what branches trigger commits by parameterizing your Jenkins build to ignore certain branches / keywords / etc if that's something you need for your specific project.
Builds by source changes
You can have Jenkins poll your Revision Control System for changes. You can specify how often Jenkins polls your revision control system using the same syntax as crontab on Unix/Linux. However, if your polling period is shorter than it takes to poll your revision control system, you may end up with multiple builds for each change. You should either adjust your polling period to be longer than the amount of time it takes to poll your revision control system, or use a post-commit trigger. You can examine the Polling Log for each build to see how long it took to poll your system.
Alternatively, instead of polling on a fixed interval, you can use a URL trigger (described above), but with /polling instead of /build at the end of the URL. This makes Jenkins poll the SCM for changes rather than building immediately. This prevents Jenkins from running a build with no relevant changes for commits affecting modules or branches that are unrelated to the job. When using /polling the job must be configured for polling, but the schedule can be empty.
We have a job in a jenkins environment which is triggered based on the changes found in the git source code repository.
When the job is running, the git polling log shows nothing and until the job finishes the execution, polling log doesn't have anything on it.
It always shows log after completing the job and another note is that, enable concurrent builds option is not set to make sure only one build runs at a time.
I would like to understand whether it is a known behavior on jenkins front to halt polling when the job is running and whether the concurrent builds option is enabled or not?
I had a similar problem and discovered this: https://issues.jenkins-ci.org/browse/JENKINS-7423
It looks like it's related to the polls requiring a workspace in order to perform the checkout. You can manually kick off new builds and they will pick up SCM changes.