1 files changed, 76 insertions, 0 deletions
diff --git a/example/example.go b/example/example.go
new file mode 100644
index 0000000..3a1b5ac
--- /dev/null
+++ b/example/example.go
@@ -0,0 +1,76 @@
+// 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)
+	}
+}