Jenkins: find build number for git commit - jenkins

Question

Each commit to my git repo triggers a build of my Jenkins pipeline.
I want to retrieve the buildNumber of an old build by commit hash. How can I do that?
I know this information exists because I can find it in the UI.
Some background as to why I want this:
When someone tags a commit I want to create a release (by tagging a docker image). Each build will push an image containing the build number. So I want to find out which build number corresponds to that commit so that I can find the image that I want to release.

Answer 1

Install Lucene plugin
https://wiki.jenkins.io/display/JENKINS/Lucene-Search
and you will be able to search by commit hash just via default Jenkins search bar! (but read plugin docs, for old builds to be searchable you need to rebuild database)
If you want to do it programatically you can use jenkins api, for example http://jenkinsapi.readthedocs.io/en/latest/using_jenkinsapi.html#example-5-getting-version-information-from-a-completed-build
Just modify function in example not to get latest successful build, but to get all builds and get their git hashes then filter this set.

Answer 2

Based on #akostadinov bit I poked around and found build number and other goodies but not GIT_COMMIT.
Maybe this would be useful to someone else so thought I would share what I found.
Open your admin script console with http://yourjenkins:8080/script and check it out for yourself.
def job = hudson.model.Hudson.instance.getItem("Foo Project")
def builds = job.getBuilds()
def thisBuild = builds[0]
def fourBuildsAgo = builds[4]
println('env' + builds[0].getEnvironment().keySet() )
println('each job has previous job e.g "' + thisBuild.getPreviousBuild() + '"')
fourBuildsAgo.getChangeSets().each {
println('Num of commits in this build ' + (it.getLogs()).size() )
it.getLogs().each {
println('commit data : ' + it.getRevision() + ' ' + it.getAuthor() + ' ' + it.getMsg())
}
}
I used this GitChangeSet API to poke around at the methods in groovy.
This code will fetch and display the commit hashes of each commit 4 builds ago. you can format your currentBuild.description with this text if you want and it will show on your status page.
This resulted in output ( real commit details hidden )
each job has previous job e.g "Foo Project #191"
Num of commits in this build 8
commit data : 288f0e7d3664045bcd0618aacf32841416519d92 user1 fixing the build
commit data : b752ee12b3d804f9a674314bef4de5942d9e02f5 user2 Fix handling to the library foo
commit data : 9067fd040199abe32d75467734a7a4d0d9b6e8b2 user2 Implemented Foo Class
...
...
...

Answer 3

If you want to get commit IDs for builds you can use groovy script like:
def job = hudson.model.Hudson.instance.getItem("My Job Name")
def builds = job.getBuilds()
Then for each git repo you are cloning, you can get revision by
println('last build ' + builds[0].getEnvironment()["GIT_COMMIT"])
println('2st last build ' + builds[1].getEnvironment()["GIT_COMMIT_4"])
For declarative pipelines see https://stackoverflow.com/a/49251515/520567

Answer 4

If I understand your question correctly, then you will first need to create a git hook to trigger a new build. This part is covered in the answer How do I react to new tags in git hooks?', though if you are using something like GitHub, BitBucket or Gitlab, then there may be other ways of going about it.
Then when the build is initiated, then there is build number which is provided as the variable 'BUILD_NUMBER' ,in Jenkins. If you want to include the git tag name, so you can use it in a script, then there seems to be a fews ways:
Git Parameter Plugin
Git Tag Message Plugin
Typically these plugins will create an environment variable that can be consumed by your scripts. I am not providing more concrete examples, since I am not aware of your exact tooling.

Answer 5

build.actions.find { action -> action instanceof jenkins.scm.api.SCMRevisionAction }?.revision?.hash;
ref & credits: https://gist.github.com/ftclausen/8c46195ee56e48e4d01cbfab19c41fc0