Devops Tutorial 30 - Parameterize jenkins pipeline jobs (part 2)
What you will Learn:
Parameterize pipeline jobs (using pipeline syntax) (continued)
Parameterize pipeline jobs (using declarative script)
Parameterize pipeline jobs (using pipeline syntax) (Contd…)
This is continuation of previous article. We got an error “Couldn't find any revision to build. Verify the repository and branch configuration for this job.”
To resolve this error, we have to change the branch name ‘master’ to ‘main’ since the github has branch name as ‘main’ 
Let us configure the project
In the ‘General’ section, rename ‘master’ to ‘main’ as shown below
Next, do the same thing in pipeline section
The code is now as shown below:
properties([parameters([choice(choices: ['main', 'feature_1'], description: 'Select desired branch to build', name: 'branches')])])
node{
stage('checkout from github') {
echo "checking-out from branch ${params.branches}"
git url: 'https://github.com/W2AGit/JenkinsPipelineAsACode', branch: "${params.branches}"
}
}
Apply and Save
Notice below that we now see ‘Build with Parameters’ option on the left hand side
Click this option.
See below. On the right hand side we see a dropdown. The text that you see below the dropdown is the description that we had mentioned while creating the choice parameter (this description is also part of code snippet that we generated)
Next click the dropdown, you would see 2 branches: master and feature_1
Let us select ‘feature_1’
Click Build. Notice below, the build is success
See console output
Similarly, build this time with ‘main’ branch
Parameterize pipeline jobs (using declarative script)
Look at the below declarative pipeline script that has 2 sections: parameters and stages. In the parameters section, we have defined 3 parameters types: choice, boolean, string
Each parameter type has: name, default value, description.
In the stages section, we are fetching these parameters using params object that we saw earlier (self-explanatory).
pipeline {
agent any
parameters{
choice(name: 'choice_param',
choices: 'pink\nred\norange',
description: 'Please choose any color')
booleanParam(name: 'boolean_param',
defaultValue: false,
description: 'Select checkbox')
string(name: 'string_param',
defaultValue: 'W2A',
description: 'Enter some string value')
}
stages {
stage('DifferentPrameterTypes') {
steps {
echo "Welcome to choice parameter: ${params.choice_param}"
echo "Welcome to boolean parameter: ${params.boolean_param}"
echo "Welcome to string parameter: ${params.string_param}"
}
}
}
}
Just copy the above code, create a new pipeline job
Paste the code in pipeline section as shown below
Apply and save
Build Now
Refresh the page to see ‘Build with Parameters’ option
Click this option.
Notice below, we see the choice, boolean and string parameters with default values
Click Build
Click Logs, you would see the print messages as expected
So this is how we can parameterize build pipelines.
Thank you for reading!