I have a multibranch project in jenkins, and every time I press Scan Repository Now it queue a new build just because
‘Jenkinsfile’ found
Met criteria
What I'd like to do is whenever I scan the repository, it only add Pull Request to the project without triggering a build. And also, if I turn on scan repository trigger, periodically if not otherwise run, every time it branch indexing, it also build the pull request even after I turn on Skip initial build on first branch indexing.
What I'd like to do is whenever there's a comment 'build' in the pull request, then it builds the branch, so if the pr doesn't contain the comment, it should not build anything.
How can I achieve this?
This is my setup
I use Jenkins 2.180
According to the pipeline documentation there should be a option do dissable Index Triggers on Multibranch types, see https://jenkins.io/doc/book/pipeline/syntax/#options
But i didn't find the option itself either, so i deactivated it per Pipeline definition in the Jenkinsfile of every branch :/
overrideIndexTriggers
Allows overriding default treatment of branch indexing triggers. If branch indexing triggers are disabled at the multibranch or
organization label, options { overrideIndexTriggers(true) } will
enable them for this job only. Otherwise, options {
overrideIndexTriggers(false) } will disable branch indexing triggers
for this job only.
I also use SCM webhooks to autmatically trigger the branch indexing etc
The default for Build Strategies is to OR the list together. You'll need to remove the existing build strategies and add an "All Strategies Match" build strategy and add "Change Requests" and "Skip Initial Build on First Branch Indexing" to that.
Source: https://issues.jenkins-ci.org/browse/JENKINS-58442
Related
I have provided branch specifiers as shown in below image. If I remove the branch specifier with $BRANCH in it, job works perfectly(gets triggered) as anyone commits to develop or feature branches.
Now I also want that same job should also be able to build the project on any specific branch of choice. So I added a branch specifier and put $BRANCH in it. I have defined BRANCH as a string parameter and the user can give branch value as input when triggering the job manually.
But in this scenario even if the user gives a "bugfix112" job is still building develop branch. Or if earlier poll action had built the job on feature branch than even after providing user-input, the job will still build feature branch.
It seems like manual input has no effect. How can I configure a Jenkins job that can be triggered on poll SCM and also with user input for the branch parameter?
i also tried giving */$BRANCH,*/${BRANCH} but no success.
So I had raised above issue with Jenkins git plugin author and it looks that for the above scenario we have to use the multi-branch pipeline. In fact, I agree with the statement.
https://issues.jenkins-ci.org/browse/JENKINS-61074
After completing a series of local commits into a local branch of a project using git and Gerrit, I push that series of changes into Gerrit for review and ultimately merge. In Gerrit, I see the "Submit With Parents" button for all but one of these commits. This is expected behavior, and I have come to understand why.
In Jenkins, I also utilize a Jenkinsfile to build out my pipelines and in doing so I also use the Gerrit Triggers plugin to react to the event stream in Gerrit. More specifically, I hook onto the merge event to trigger release ready builds for testing purposes.
When I submit each change individually, Jenkins triggers a build and moves along it's merry way building things one at a time. But... If I merge with parents (assume large feature implementation), Gerrit triggers an event for every single commit in the series. What I am curious to know, is if there is a way in either Jenkins or Gerrit to only handle the event from the child commit and omit the events for the parents?
Jenkins/Gerrit have not a way to handle specifically this but I'll suggest some workarounds:
1) You could add a "Topic" to the Gerrit Trigger on Jenkins with something like a "build" value. Doing this, Jenkins will only build merged changes of this topic and you only need to add the "build" topic to the child change to let Jenkins know what commit you want to build.
2) You could change the Gerrit trigger from "Change Merged" to "Comment Added Contains Regular Expression" with something like a "build" value. Doing this, Jenkins will not build when the changes are merged and you can trigger the build from the child commit just adding a "build" comment in the child change on Gerrit.
I hope this helps
I've been using Jenkins and I've seen a lot of Pipeline examples (declarative ones) and I've seen some using the pollSCM property in the Jenkinsfile to trigger a build, like this:
triggers {
pollSCM('H/5 * * * *')
}
However, I've seen this Scan Multibranch Pipeline Triggers option when configuring a Multibranch pipeline. I'm not sure what's the difference between those.
All this problem came to me because I'm facing some cases where two builds are being triggered for the same job, and I thought it was because I have both these options configured.
Can anyone please help me understand this difference?
Thank you!
Scan Multibranch Pipeline Trigger
The ‘Scan Multibranch Pipeline’ trigger will scan the repository for new branches and changes in existing branches. By default it will trigger a new build for all branches which have been updated. However in the multibranch job configuration you can disable this automatic trigger for specific - or all - branches. However, please note that you have to set up the web hook for your repository so that Jenkins will be notified of any changes. As the hook setup will depend both on the Jenkins plugin used to checkout the Jenkinsfile as well as on the Git server, you will have to look this up accordingly.
Poll SCM
The pollSCM trigger is branch-specific. Within a Jenkinsfile you may configure different options for different branches. This option will never be able to trigger the very first build for a branch as it would need at least one build so the properties step gets executed and the pollSCM option set. That is: Any change here will only get effective AFTER the next build.
You can use pollSCM trigger in two ways:
Real polling. That is: Tell Jenkins to check the repository for changes in certain time intervals.
Waiting for notification by some repository hook. For this you'd need to
Keep the string passed to pollSCM empty:
triggers {
pollSCM('')
}
Set up a hook on your git server to notify Jenkins (See How to configure Git post commit hook)
Recommendation
Therefore I’d recommend to stick to the trigger based on the Multibranch branch scan - if possible. However in some special cases (e.g. if the first build on a new branch should never be built automatically) it still might be useful to use the poll SCM feature. In that case you might want to disable the automatic trigger as required.
Last but not least the poll SCM feature may use a different plugin than the Scan Multibranch Pipeline, e.g. for Bitbucket.
AFAIK for Bitbucket the multibranch trigger is little bit more flexible, allows to trigger a build on more events compared the the plain Bitbucket trigger.
I think pollSCM must be the jenkins plugin
https://wiki.jenkins.io/display/JENKINS/PollSCM+Plugin
Multibranch pipeline : This is the type of pipeline, where jenkins scan and pull from all the branch within the repository , so the build will trigger automatically when some code is checked in within the branch (if you have configured it)
I Have been working on bitbucket and jenkins for android applications. I am having many branches in my repository and i want to track just my master branch in jenkins where it meets the following criteria. 1) When we push any code with name 'A' into master it should automatically trigger a build.2) when we push a code as name 'B' into the same master branch it shouldn't trigger the build. Is there a way to do it. I tried excluding branch by using :^(?!.release).*$ but it is picking all other branches too.
Can anyone help?
You can specify which branch to be built in your job like this:
If you don't want the build to occur for specific codes then you can add them in to the Excluded Regions
Go to Additional Behaviors under Git in your job configuration and select Polling ignores commits in certain pathsand add the paths to the files for those you want to ignore builds if any changes happen to them:
This should work!
I've set up a number of Multibranch Pipeline jobs in Jenkins (running 2.46.2 LTS, Branch API 2.0.8, GitHub Branch Source 2.0.5, and Pipeline Multibranch 2.14) and have just noted that branch indexing -- and thus any cleanup of old branches -- does not appear to be triggered by the webhook calls from GitHub. It only appears to be triggered if someone manually clicks the "Scan Repository Now" link, or if the job configuration in Jenkins is re-saved. I'm using the timestamp shown in the "Scan Repository Log" page as an indication of when the branch indexing occurs.
It seems that new branches or changes to existing ones are being detected correctly and built, so the webhooks from source control (GitHub) are working, but was surprised that this wasn't also triggering the branch indexing and thus the old branch cleanup. I just can't tell from the documentation whether this is correct and expected behavior or if something is incorrect in my setup.
I note that the help text for the "Periodically if not otherwise run" setting says:
Some kinds of folders are reindexed automatically and immediately upon receipt of an external event. For example, a multi-branch project will recheck its SCM repository for new or removed or modified branches when it receives an SCM change notification. (Push notification may be configured as per the SCM plugin used for each respective branch source.) Such notifications can occasionally be unreliable, however, or Jenkins might not even be running to receive them. In some cases no immediate notification is even possible, for example because Jenkins is behind a firewall and can only poll an external system.
This trigger allows for a periodic fallback, but when necessary. If no indexing has been performed in the specified interval, then an indexing will be scheduled. For example, in the case of a multi-branch project, if the source control system is not configured for push notification, set a short interval (most people will pick between 15 minutes and 1 hour). If the source control system is configured for push notification, set an interval that corresponds to the maximum acceptable delay in the event of a lost push notification as the last commit of the day. (Subsequent commits should trigger indexing anyway and result in the commit being picked up, so most people will pick between 4 hours and 1 day.)
This certainly implies that indexing of a Multibranch Pipeline job should be re-triggered by branch events (e.g., pushes from GitHub via webhook), but the timestamp on my indexing log seems to belie that.
So, is what I'm observing the intended behavior? If so, and I want a regular cleanup of old branches, do I need to select the "Periodically if not otherwise run" checkbox under "Scan repository triggers"? Or is there something wrong with my setup, which is preventing it from working as intended?
According to the official documentation:
By default, Jenkins will not automatically re-index the repository for branch additions or deletions (unless using an Organization Folder), so it is often useful to configure a Multibranch Pipeline to periodically re-index in the configuration.
I depend on "Periodically if not otherwise run" for 1) cleanup of branches and 2) creation of container jobs for brand new repos (i use "Bitbucket Team/Project", the bitbucket version of "Github Organization", which basically creates a multibranch pipeline for every repo in your organization). I have "Periodically if not otherwise run" set to run once a day for each project.
It does seem like these things could work via webhook, but they do not in my experience.