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bashgroovyjenkins-pipelinejenkins-groovyk6

Pass an array from groovy to bash

I use Jenkins for k6 tests CI/CD. In my pipeline I have the code:

def users = ["user1","user2","user3"]
sh """
export MY_USERS=${users.join(' ')}
./start.sh
"""

In my bash script I have:

SCRIPT_USERS=$MY_USERS

for user in $MY_USERS; do
  eval "$PARAMS $K6 run $user.js -o xk6-influxdb \
  --out web-dashboard=port=0\&report=$DIR/${user}.html" &
done

However, in logs I got SCRIPT_USERS=user1

How can I get my values in a bash variable? I need all the values. Tried different ways of passing the variables but no worked.

Solution

  • In the Groovy script, you are constructing a script dynamically. The equivalent after users.join(' ') is executed is

    export MY_USERS=user1 user2 user3

    which exports the name MY_USERS after it is assigned the value user1, but also exports the undefined names user2 and user3.

    You need to quote ${users.join(' ')} so that the entire result is part of the single assignment to MY_USERS.

    def users = ["user1","user2","user3"]
sh """
export MY_USERS="${users.join(' ')}"
./start.sh
"""

    Your actual bash script is more or less fine. SCRIPT_USERS isn't necessary; you can just use MY_USERS directly as you are anyway. eval may not be necessary, and you should work to avoid it if you can. There is a general issue of relying on a space-separated string to correctly represent an array of arbitrary strings, but assuming your user names are "simple" (nothing except alphanumeric characters), you can get away with it.