10分鐘搞定讓你困惑的 Jenkins 環(huán)境變量過程詳解

docker container run --rm -p 8080:8080 -p 50000:50000 --name=jenkins -v $(pwd):/var/jenkins_home jenkins/jenkins

pipeline {
  agent any

  stages {
    stage("Env Variables") {
      steps {
        sh "printenv"
      }
    }
  }
}

pipeline {
  agent any

  stages {
    stage("Read Env Variables") {
      steps {
        echo "帶 env 的讀取方式：${env.BUILD_NUMBER}"
        echo "不帶 env 的讀取方式：${BUILD_NUMBER}"
        sh 'echo "shell 中讀取方式 $BUILD_NUMBER"'
      }
    }
  }
}

pipeline {
  agent any

  environment {
    FOO = "bar"
  }

  stages {
    stage("Custom Env Variables") {
      environment {
        NAME = "RGYB"
      }

      steps {
        echo "FOO = ${env.FOO}"
        echo "NAME = ${env.NAME}"

        script {
          env.SCRIPT_VARIABLE = "Thumb Up"
        }

        echo "SCRIPT_VARIABLE = ${env.SCRIPT_VARIABLE}"

        withEnv(["WITH_ENV_VAR=Come On"]) {
          echo "WITH_ENV_VAR = ${env.WITH_ENV_VAR}"
        }
      }
    }
  }
}

pipeline {
  agent any

  environment {
    FOO = "你當(dāng)像鳥飛往你的山"
    NAME = "Tan"
  }

  stages {
    stage("Env Variables") {
      environment {
       	// 會(huì)重寫第 6 行 變量
        NAME = "RGYB" 
       	// 會(huì)重寫系統(tǒng)內(nèi)置的環(huán)境變量 BUILD_NUMBER
        BUILD_NUMBER = "10" 
      }

      steps {
       	// 應(yīng)該打印出 "FOO = 你當(dāng)像鳥飛往你的山"
        echo "FOO = ${env.FOO}" 
       	// 應(yīng)該打印出 "NAME = RGYB"
        echo "NAME = ${env.NAME}" 
       	// 應(yīng)該打印出 "BUILD_NUMBER = 10"
        echo "BUILD_NUMBER = ${env.BUILD_NUMBER}" 

        script {
         	// 腳本式創(chuàng)建一個(gè)環(huán)境變量
          env.SCRIPT_VARIABLE = "1" 
        }
      }
    }

    stage("Override Variables") {
      steps {
        script {
         	// 這里的 FOO 不會(huì)被重寫，違背 Rule No.2
          env.FOO = "Tara"
         	// SCRIPT_VARIABLE 變量會(huì)被重寫，符合 Rule No.3
          env.SCRIPT_VARIABLE = "2" 
        }

       	// FOO 在第 37 行重寫失敗，還會(huì)打印出 "FOO = 你當(dāng)像鳥飛往你的山"
        echo "FOO = ${env.FOO}" 
       	// 會(huì)打印出 "SCRIPT_VARIABLE = 2"
        echo "SCRIPT_VARIABLE = ${env.SCRIPT_VARIABLE}" 

       	// FOO 會(huì)被重寫，符合 Rule No.1
        withEnv(["FOO=Educated"]) { 
         	// 應(yīng)該打印 "FOO = Educated"
          echo "FOO = ${env.FOO}" 
        }

       	// 道理同上
        withEnv(["BUILD_NUMBER=15"]) {
         	// 應(yīng)該打印出 "BUILD_NUMBER = 15"
          echo "BUILD_NUMBER = ${env.BUILD_NUMBER}"
        }
      }
    }
  }
}

pipeline {
  agent any

  environment {
    IS_BOOLEAN = false
  }

  stages {
    stage("Env Variables") {
      steps {
        script {
         	// Hello 會(huì)被打印出來，因?yàn)榉强兆址紩?huì)被認(rèn)為是 Boolean.True
          if (env.IS_BOOLEAN) {
            echo "Hello"
          }

         	// 真正的 Boolean 比較
          if (env.IS_BOOLEAN.toBoolean() == false) {
            echo "日拱一兵"
          }
         
         	// 真正的 Boolean 
          if (!env.IS_BOOLEAN.toBoolean()) {
            echo "RGYB"
          }
        }
      }
    }
  }
}

pipeline {
  agent any

  environment {
   	// 使用 trim() 去掉結(jié)果中的空格
    LS_RESULT = "${sh(script:'ls -lah', returnStdout: true).trim()}"
  }

  stages {
    stage("Env Variables") {
      steps {
        echo "LS_RESULT = ${env.LS_RESULT}"
      }
    }
  }
}