Feat/version manifests (#387)

Signed-off-by: Fabian Kammel <fk@edgeless.systems>
Co-authored-by: Otto Bittner <cobittner@posteo.net>

hack/build-manifest/main.go

@@ -0,0 +1,59 @@
+package main
+
+import (
+	"context"
+	"encoding/json"
+	"os"
+
+	"github.com/edgelesssys/constellation/hack/build-manifest/azure"
+	"github.com/edgelesssys/constellation/hack/build-manifest/gcp"
+	"github.com/edgelesssys/constellation/internal/logger"
+	"go.uber.org/zap/zapcore"
+)
+
+const (
+	AzureSubscriptionIDEnv = "AZURE_SUBSCRIPTION_ID"
+)
+
+func main() {
+	ctx := context.Background()
+	log := logger.New(logger.PlainLog, zapcore.InfoLevel)
+	manifests := OldManifests()
+
+	fetchAzureImages(ctx, manifests, log)
+	fetchGCPImages(ctx, manifests, log)
+
+	if err := json.NewEncoder(os.Stdout).Encode(&manifests); err != nil {
+		log.Fatalf("%v", err)
+	}
+}
+
+func fetchAzureImages(ctx context.Context, manifests Manifest, log *logger.Logger) {
+	options := azure.DefaultOptions()
+	if err := options.SetSubscription(os.Getenv(AzureSubscriptionIDEnv)); err != nil {
+		log.Fatalf("please provide a valid subscription UUID via '%s' envar", AzureSubscriptionIDEnv)
+	}
+
+	client := azure.NewClient(log, options)
+	images, err := client.FetchImages(ctx)
+	if err != nil {
+		log.Fatalf("unable to fetch Azure image: %v", err)
+	}
+
+	for version, image := range images {
+		manifests.SetAzureImage(version, image)
+	}
+}
+
+func fetchGCPImages(ctx context.Context, manifests Manifest, log *logger.Logger) {
+	options := gcp.DefaultOptions()
+	client := gcp.NewClient(ctx, log, options)
+	images, err := client.FetchImages(ctx)
+	if err != nil {
+		log.Fatalf("unable to fetch GCP images: %v", err)
+	}
+
+	for version, image := range images {
+		manifests.SetGCPImage(version, image)
+	}
+}