Changing the email recipients email based on branch deployed in email-ext plugin

Question

The Email-ext plugin works great when it comes to sending the email.

To implement the conditions to match before sending the email ,I found it has the feature to write presend scripts. But I cannot find the proper documentations for how to write the script.

My requirement:

If the branch being deployed is master or develop than I want to use one set of email recipients else other set of emails.

Provide me the right way to get going with the scripts

1. Can we write bash script there
2. Can we use the variables set in bash script to the presend script

Answer 1

2) you can use any variables you want, Jenkins env variables or any variable you add with the help of "env inject" plugin.

Regarding your question:

If the branch being deployed is master or develop than I want to use one set of email recipients else other set of emails

Example:

1)execute shell step in post build actions

if [ $BRANCH == "develop" ];then
   echo DEV_RECIPIENTS=dev1@mail,dev2@mail,dev3@mail > recipient.txt
else
   #assuming only master branch is left
   echo MASTER_RECIPIENT=master@mail,master2@mail > recipient.txt
fi

2) Using EnvInject Plugin, add step "Inject environment variables" and specify previously created recipient.txt

Now you can use DEV_RECIPIENT or MASTER_RECIPIENT( depends on branch built) by ${DEV_RECIPIENT} or ${MASTER_RECIPIENT}

3) just paste this variable in extEmail step field "Recipient List": ${DEV_RECIPIENT}

Answer 2

Looks complicated but this is how I solved it:

preSend Script:

if ("develop"=="${BRANCH_TAG_NAME}" || "master"=="${BRANCH_TAG_NAME}") {
          recipients = msg.getRecipients(javax.mail.Message.RecipientType.TO)
          msg.setRecipients(javax.mail.Message.RecipientType.TO, "email1,email2")
        }

     else{
recipients = msg.getRecipients(javax.mail.Message.RecipientType.TO)
msg.setRecipients(javax.mail.Message.RecipientType.TO,"email2,email3")
    }

Where:

BRANCH_TAG_NAME is the branch-name whose value is being set in bash script. Looks like we can easily access the variable defined in bash script to the preSend script.