Having problem to dynamically retrieve the bamboo variable value

Question

Hello, I'm writing a script to utilize the bamboo variables. I have a echo line looks like: echo ${bamboo.dependency.parent.!parentsIndex!}

The parentsIndex variable is a number here based on my personal requirement and it's ensured that this number won't exceed the max index of the parents that this build has. So ideally, I want this line to output the name of the parent which I request for. However, it outputs ${bamboo.dependency.parent.1}, instead of dynamically retrieving the bamboo variable name. How should I change the way to set and echo this line?

Eduardo Alvarenga · Answer

Hello @Kexin Pei

bamboo.dependency.parent.# variables are protected and you can't overwrite them.

You can declare a second variable based on that output and consume it instead:

Try this:

#!/bin/bash

# This is to simulate Bamboo - it will there already
bamboo_dependency_parent_0=PLAN-KEY

# Index you want -- change it to the position you want here or via script
parentsIndex=0

# Declare the variable you will consume using dynamic vars
declare bamboo_dependency_parent_name=bamboo_dependency_parent_${parentsIndex}

# Evaluate and consume it -- this will print "PLAN-KEY"
echo ${!bamboo_dependency_parent_name}

Cheers,

Eduardo Alvarenga
Atlassian Support APAC

--please don't forget to Accept the answer if the reply is helpful--

Kexin Pei · Answer

Hello Eduardo,

Thanks for the reply : ) ! I still have a problem about how to create the properties text file. So in my usage, I want to access to a bamboo variable looks like: bamboo.dependency.parent.<parentsIndex>. So parentsIndex will be the namespace that I want to inject before the script. But parentsIndex is a calculated number instead of a simple self-customized namespace. How should I define this namespace in the properties text file then?

Thanks,

Kexin

Eduardo Alvarenga · Answer

Hello @Kexin Pei

Welcome to the Atlassian Community!

In Bamboo, variable substitution happens before the build is started. If a variable needs to be replaced or created during the build, you need to use an Inject Variables Task that will consume a Java properties file on a key=value format.

So basically, you must create a properties text file, consume it through the Inject Variables task and use the new variable from the next task (or Stage).

Check this documentation for more information:

* Configuring a Variables Task

Sincerely,

Eduardo Alvarenga
Atlassian Support APAC

--please don't forget to Accept the answer if the reply is helpful--