read_ec2_metadata.go

package main

import (
	"encoding/json"
	"fmt"
	"log"
	"os"

	"github.com/aws/aws-sdk-go/aws/ec2metadata"
	"github.com/aws/aws-sdk-go/aws/session"
)

func main() {
	sess := session.Must(session.NewSession())
	meta := ec2metadata.New(sess)
	identityDocument, err := meta.GetInstanceIdentityDocument()
	if err != nil {
		log.Fatalf("Failed to get instance identity %s", err)
	}
	content, err := json.MarshalIndent(identityDocument, "", "    ")
	fmt.Println(string(content))
	if len(os.Args) > 0 {
		for _, path := range os.Args[1:] {
			str, err := meta.GetMetadata(path)
			if err != nil {
				log.Printf("Failed to query metadata for %s. %s", path, err)
			}else {
				fmt.Printf("%s =>  %s\n", path, str)
			}
		}

	}

}