AB#2544 add upgrade agent for automatic version updates (#745)

upgrade-agent/cmd/main.go

@@ -0,0 +1,48 @@
+/*
+Copyright (c) Edgeless Systems GmbH
+
+SPDX-License-Identifier: AGPL-3.0-only
+*/
+
+package main
+
+import (
+	"flag"
+
+	"github.com/edgelesssys/constellation/v2/internal/constants"
+	"github.com/edgelesssys/constellation/v2/internal/file"
+	"github.com/edgelesssys/constellation/v2/internal/logger"
+	upgradeagent "github.com/edgelesssys/constellation/v2/upgrade-agent"
+	"github.com/spf13/afero"
+	"go.uber.org/zap"
+)
+
+const (
+	protocol = "unix"
+)
+
+func main() {
+	gRPCDebug := flag.Bool("debug", false, "Enable gRPC debug logging")
+	verbosity := flag.Int("v", 0, logger.CmdLineVerbosityDescription)
+	flag.Parse()
+
+	log := logger.New(logger.JSONLog, logger.VerbosityFromInt(*verbosity)).Named("bootstrapper")
+	defer log.Sync()
+
+	if *gRPCDebug {
+		log.Named("gRPC").ReplaceGRPCLogger()
+	} else {
+		log.Named("gRPC").WithIncreasedLevel(zap.WarnLevel).ReplaceGRPCLogger()
+	}
+
+	handler := file.NewHandler(afero.NewOsFs())
+	server, err := upgradeagent.New(log, handler)
+	if err != nil {
+		log.With(zap.Error(err)).Fatalf("Failed to create update server")
+	}
+
+	err = server.Run(protocol, constants.UpgradeAgentSocketPath)
+	if err != nil {
+		log.With(zap.Error(err)).Fatalf("Failed to start update server")
+	}
+}