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|
// Package main contains an example use of this library; it
// prints the current Fedora CoreOS EC2(AWS) x86_64 AMI in the
// us-east-2 region.
package main
import (
"fmt"
"os"
"github.com/coreos/stream-metadata-go/fedoracoreos"
"github.com/coreos/stream-metadata-go/stream"
)
const (
targetArch = "x86_64"
region = "us-east-2"
)
func downloadISO(fcosstable stream.Stream) error {
iso, err := fcosstable.QueryDisk(targetArch, "metal", "iso")
if err != nil {
return err
}
fmt.Printf("Downloading %s\n", iso.Location)
path, err := iso.Download(".")
if err != nil {
return fmt.Errorf("Failed to download %s: %w", iso.Location, err)
}
fmt.Printf("Downloaded %s\n", path)
return nil
}
func printAMI(fcosstable stream.Stream) error {
arch, ok := fcosstable.Architectures[targetArch]
if !ok {
return fmt.Errorf("No %s architecture in stream", targetArch)
}
awsimages := arch.Images.Aws
if awsimages == nil {
return fmt.Errorf("No %s AWS images in stream", targetArch)
}
var regionVal stream.SingleImage
if regionVal, ok = awsimages.Regions[region]; !ok {
return fmt.Errorf("No %s AWS images in region %s", targetArch, region)
}
fmt.Printf("%s\n", regionVal.Image)
return nil
}
func run() error {
if len(os.Args) != 2 {
return fmt.Errorf("usage: example aws-ami|download-iso")
}
arg := os.Args[1]
fcosstable, err := fedoracoreos.FetchStream(fedoracoreos.StreamStable)
if err != nil {
return err
}
if arg == "aws-ami" {
return printAMI(*fcosstable)
} else if arg == "download-iso" {
return downloadISO(*fcosstable)
} else {
return fmt.Errorf("invalid operation %s", arg)
}
}
func main() {
if err := run(); err != nil {
fmt.Fprintf(os.Stderr, "%v\n", err)
os.Exit(1)
}
}
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