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POJenkins Partial Build / Modular Build on Commit Hook
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  1. POJenkins Partial Build / Modular Build on Commit Hook
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    copied!<p><em>Tools</em>:<br> Jenkins ver. 1.470<br> Maven 2<br> Subversion</p> <p><strong>Environment</strong></p> <p>Assume my build has a number of projects A-D. The dependency graph exists as shown. That is to say: B depends on classes in A, C depends on classes in B, D depends on classes in A. We create the jenkins builds such that they call the builds dependent upon them as a post-build action.</p> <p>A<br> |--> B --> C<br> |--> D</p> <p>Each night, we trigger a full build in Jenkins (A builds, triggers B (triggers C), triggers D). This is done easily enough by telling A to build nightly, and the rest cascades.</p> <p><strong>Problem</strong> </p> <p>However, on a commit we want to build the projects that were committed to once. </p> <ul> <li><p><em>Situation 1</em>: We poll the repository (or use <a href="https://wiki.jenkins-ci.org/display/JENKINS/Subversion+Plugin#SubversionPlugin-Postcommithook">commit hooks</a>, it makes no difference) and find that there was a commit to B, then B will build and C will build. <strong>Success!</strong></p></li> <li><p><em>Situation 2</em>: We poll the repository and find that B and C were committed to in one commit, then Jenkins will try to build B (triggering a build of C), and build C (a second build). <strong>Failure.</strong> See what happens? C was built twice, taking up precious build time. <em>Keep the build fast!</em></p></li> </ul> <p><strong>Does anyone know a way to only trigger the highest project in each committed build pipeline?</strong></p> <p>I suppose one solution would be a complex SVN hook that determines the highest project in each pipeline...</p> <ul> <li><em>Situation 3</em>: Commit to B C and D in one commit. SVN hook finds C depends on B. The hook calls project-specific links to start builds for B and D.</li> </ul> <p>Pitfalls: Very complex SVN commit hook. Have to upkeep the pipeline in the SVN hook.</p> <p>I feel like this is a problem others have run into. Is there a Jenkins plugin that helps with this?</p>
 

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