Jenkins - How to access BUILD NUMBER environment variable

Question

Are Jenkins parameters case-sensitive  I have a parametrized build which needs an ant parameter named  build parameter  to be set before the build  When I try to access the   BUILD NUMBER  set by Jenkins  I get the value set for the ant parameter  If the build parameters are not case sensitive  can anyone suggest me a work around to this issue  I cannot change the build parameter name as I will have to change my build scripts  which is not an option   Thanks

User · Answer

Assuming I am understanding your question and setup correctly,

If you're trying to use the build number in your script, you have two options:

1) When calling ant, use: ant -Dbuild_parameter=${BUILD_NUMBER}

2) Change your script so that:

<property environment="env" />
<property name="build_parameter"  value="${env.BUILD_NUMBER}"/>

User · Answer

To Answer your first question  Jenkins variables are case sensitive  However  if you are writing a windows batch script  they are case insensitive  because Windows doesn t care about the case   Since you are not very clear about your setup  let s make the assumption that you are using an ant build step to fire up your ant task  Have a look at the Jenkins documentation  same page that Adarsh gave you  but different chapter  for an example on how to make Jenkins variables available to your ant task   EDIT      Hence  I will need to access the environmental variable   BUILD NUMBER  to construct the URL    Why don t you use  BUILD URL then  Isn t it available in the extended email plugin

User · Answer

For Groovy script in the Jenkinsfile using the  BUILD NUMBER it works

[jenkins] Jenkins - How to access BUILD_NUMBER environment variable

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