config: add separate option for handling attestation parameters (#1623)

* Add attestation options to config

* Add join-config migration path for clusters with old measurement format

* Always create MAA provider for Azure SNP clusters

* Remove confidential VM option from provider in favor of attestation options

* cli: add config migrate command to handle config migration (#1678)

---------

Signed-off-by: Daniel Weiße <dw@edgeless.systems>

cli/internal/cmd/configmigrate.go

@@ -0,0 +1,61 @@
+/*
+Copyright (c) Edgeless Systems GmbH
+
+SPDX-License-Identifier: AGPL-3.0-only
+*/
+
+package cmd
+
+import (
+	"fmt"
+
+	"github.com/edgelesssys/constellation/v2/internal/config"
+	"github.com/edgelesssys/constellation/v2/internal/config/migration"
+	"github.com/edgelesssys/constellation/v2/internal/file"
+	"github.com/spf13/afero"
+	"github.com/spf13/cobra"
+)
+
+func newConfigMigrateCmd() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "migrate",
+		Short: "Migrate a configuration file to a new version",
+		Long:  "Migrate a configuration file to a new version.",
+		Args:  cobra.NoArgs,
+		RunE:  runConfigMigrate,
+	}
+	return cmd
+}
+
+func runConfigMigrate(cmd *cobra.Command, _ []string) error {
+	handler := file.NewHandler(afero.NewOsFs())
+	configPath, err := cmd.Flags().GetString("config")
+	if err != nil {
+		return fmt.Errorf("parsing config path flag: %w", err)
+	}
+	return configMigrate(cmd, configPath, handler)
+}
+
+func configMigrate(cmd *cobra.Command, configPath string, handler file.Handler) error {
+	// Make sure we are reading a v2 config
+	var cfgVersion struct {
+		Version string `yaml:"version"`
+	}
+	if err := handler.ReadYAML(configPath, &cfgVersion); err != nil {
+		return err
+	}
+
+	switch cfgVersion.Version {
+	case config.Version3:
+		cmd.Printf("Config already at version %s, nothing to do", config.Version3)
+		return nil
+	case migration.Version2:
+		if err := migration.V2ToV3(configPath, handler); err != nil {
+			return fmt.Errorf("migrating config: %w", err)
+		}
+		cmd.Printf("Successfully migrated config to %s\n", config.Version3)
+		return nil
+	default:
+		return fmt.Errorf("cannot convert config version %s to %s", cfgVersion.Version, config.Version3)
+	}
+}