Jenkinsfile3

#!/usr/bin/env groovy

@Library('shared-library@master') _ //master or whatever branch

  def getDockerTag(){
        def tag = sh script: 'git rev-parse HEAD', returnStdout: true
        return tag
        }
pipeline{
      agent any
       environment{
	    Docker_tag = getDockerTag()
        }
      parameters {
	      choice(name:'mvnaction',
	      choices: 'Clean\nCompile\nTest\nInstall',
	      description: 'based on selection jenkins will run resepective maven command')
    	}
        stages{
              stage('build'){
		      
		      agent {
                	docker {
                	image 'maven'
                	args '-v $HOME/.m2:/root/.m2'
               		    }
           	 	}		      
                  steps{
			  build ("${mvnaction}")
               	     }  
                 }	
		stage ('docker build and push') {	
		   when {
				expression { params.mvnaction == 'Install' }
			}
                    steps {
			sh 'cp -r ../shared-library@2/target .'
			    dockerbuild ("${Docker_tag}")
                    }
                }
                 stage ('Check logs') {
                    steps {
                        filterLogs ('WARNING', 10)
                    }
                }
		
           }	       	     	         
}