Jenkinsfile Groovy snippet for populating a user input with docker image tags (ECR).

jenkinsfile_dynamic_user_input.groovy

#!/usr/bin/env groovy
# Requires the following envars:
#   - SRC_ENV    : The source env/awscli profile for of the ecr repo to pull from.
#   - ECR_REPO   : The name of the ecr repository to pull from.
#   - AWS_REGION : The AWS Region of the source repo
# This assuems the jenkins host is setup with aws profiles.

def getOptions() {
    return (["/bin/bash", "-c", "aws --profile ${SRC_ENV} --region ${AWS_REGION} ecr describe-images --repository-name ${env.ECR_REPO} --query 'reverse(sort_by(imageDetails,& imagePushedAt))[0:24].imageTags' --output text | sed 's/[[:blank:]]/\\n/g' | sed '/latest/d; /SNAPSHOT/d' | sed ':a;N;\$!ba;s/\\n/ /g; s/\\s\$/\\n/g'"].execute().text.tokenize())
}

pipeline {

    agent any
    
    stages {
        stage('Version') {
            steps {
                script {
                    env.VERSION = input message: 'User input required', ok: 'GO!',
                        parameters: [choice(name: 'VERSION', choices: getOptions(), description: 'Select the VERSION.')]
                }
            }
        }
    }

}