import ( "github.com/docker/docker/engine" "encoding/json" "fmt" ) // Define a job myJob := engine.Job{} // Add some environment variables to the job myJob.Env = []string{"FOO=bar", "BAZ=qux"} // Retrieve the environment variables as JSON jsonEnv, err := json.Marshal(myJob.GetenvJson()) if err != nil { fmt.Println("Error getting environment variables:", err) } fmt.Println(string(jsonEnv)) // Output: {"FOO":"bar","BAZ":"qux"}
FROM myimage ENV FOO=bar BAZ=qux CMD ["sh", "-c", "echo $FOO $BAZ"] # Retrieve the environment variables as JSON jsonEnv := engine.NewJob(nil).GetenvJson() fmt.Println(string(jsonEnv)) // Output: {"FOO":"bar","BAZ":"qux"}This example shows how the GetenvJson method can be used in a Dockerfile to retrieve the environment variables for a container image.