image: implement idempotent upload of os images

image/upload/internal/cmd/gcp.go

@@ -0,0 +1,98 @@
+/*
+Copyright (c) Edgeless Systems GmbH
+
+SPDX-License-Identifier: AGPL-3.0-only
+*/
+
+package cmd
+
+import (
+	"fmt"
+	"io"
+	"os"
+
+	"github.com/edgelesssys/constellation/v2/internal/logger"
+	"github.com/edgelesssys/constellation/v2/internal/osimage"
+	"github.com/edgelesssys/constellation/v2/internal/osimage/archive"
+	gcpupload "github.com/edgelesssys/constellation/v2/internal/osimage/gcp"
+	"github.com/spf13/cobra"
+)
+
+// NewGCPCommand returns the command that uploads an OS image to GCP.
+func NewGCPCommand() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "gcp",
+		Short: "Upload OS image to GCP",
+		Long:  "Upload OS image to GCP.",
+		Args:  cobra.ExactArgs(0),
+		RunE:  runGCP,
+	}
+
+	cmd.Flags().String("gcp-project", "constellation-images", "GCP project to use")
+	cmd.Flags().String("gcp-location", "europe-west3", "GCP location to use")
+	cmd.Flags().String("gcp-bucket", "constellation-images", "GCP bucket to use")
+	return cmd
+}
+
+func runGCP(cmd *cobra.Command, _ []string) error {
+	workdir := os.Getenv("BUILD_WORKING_DIRECTORY")
+	if len(workdir) > 0 {
+		must(os.Chdir(workdir))
+	}
+
+	flags, err := parseGCPFlags(cmd)
+	if err != nil {
+		return err
+	}
+	log := logger.New(logger.PlainLog, flags.logLevel)
+	log.Debugf("Parsed flags: %+v", flags)
+
+	archiveC, err := archive.New(cmd.Context(), flags.region, flags.bucket, log)
+	if err != nil {
+		return err
+	}
+
+	uploadC, err := gcpupload.New(cmd.Context(), flags.gcpProject, flags.gcpLocation, flags.gcpBucket, log)
+	if err != nil {
+		return fmt.Errorf("uploading image: %w", err)
+	}
+
+	file, err := os.Open(flags.rawImage)
+	if err != nil {
+		return fmt.Errorf("uploading image: opening image file %w", err)
+	}
+	defer file.Close()
+	size, err := file.Seek(0, io.SeekEnd)
+	if err != nil {
+		return err
+	}
+	if _, err := file.Seek(0, io.SeekStart); err != nil {
+		return err
+	}
+	out := cmd.OutOrStdout()
+	if len(flags.out) > 0 {
+		outF, err := os.Create(flags.out)
+		if err != nil {
+			return fmt.Errorf("uploading image: opening output file %w", err)
+		}
+		defer outF.Close()
+		out = outF
+	}
+
+	sbDatabase, uefiVarStore, err := loadSecureBootKeys(flags.pki)
+	if err != nil {
+		return err
+	}
+
+	uploadReq := &osimage.UploadRequest{
+		Provider:     flags.provider,
+		Version:      flags.version,
+		Variant:      flags.variant,
+		SBDatabase:   sbDatabase,
+		UEFIVarStore: uefiVarStore,
+		Size:         size,
+		Timestamp:    flags.timestamp,
+		Image:        file,
+	}
+	return uploadImage(cmd.Context(), archiveC, uploadC, uploadReq, out)
+}