Sync components with state during container start (#1653)

* Sync components with state during container start

* path approach

internal/pkg/agent/application/paths/common.go

@@ -35,6 +35,7 @@ var (
 	configFilePath  string
 	logsPath        string
 	downloadsPath   string
+	componentsPath  string
 	installPath     string
 	unversionedHome bool
 	tmpCreator      sync.Once
@@ -46,14 +47,23 @@ func init() {
 	logsPath = topPath
 	unversionedHome = false // only versioned by container subcommand
 
+	// these should never change
+	versionedHome := VersionedHome(topPath)
+	downloadsPath = filepath.Join(versionedHome, "downloads")
+	componentsPath = filepath.Join(versionedHome, "components")
+
 	fs := flag.CommandLine
 	fs.StringVar(&topPath, "path.home", topPath, "Agent root path")
 	fs.BoolVar(&unversionedHome, "path.home.unversioned", unversionedHome, "Agent root path is not versioned based on build")
 	fs.StringVar(&configPath, "path.config", configPath, "Config path is the directory Agent looks for its config file")
 	fs.StringVar(&configFilePath, "c", DefaultConfigName, "Configuration file, relative to path.config")
 	fs.StringVar(&logsPath, "path.logs", logsPath, "Logs path contains Agent log output")
-	fs.StringVar(&downloadsPath, "path.downloads", downloadsPath, "Downloads path contains binaries Agent downloads")
 	fs.StringVar(&installPath, "path.install", installPath, "Install path contains binaries Agent extracts")
+
+	// enable user to download update artifacts to alternative place
+	// TODO: remove path.downloads support on next major (this can be configured using `agent.download.targetDirectory`)
+	// `path.download` serves just as init value for `agent.download.targetDirectory`
+	fs.StringVar(&downloadsPath, "path.downloads", downloadsPath, "Downloads path contains binaries Agent downloads")
 }
 
 // Top returns the top directory for Elastic Agent, all the versioned
@@ -146,7 +156,7 @@ func Run() string {
 
 // Components returns the component directory for Agent
 func Components() string {
-	return filepath.Join(Home(), "components")
+	return componentsPath
 }
 
 // Logs returns the log directory for Agent
@@ -166,9 +176,6 @@ func VersionedHome(base string) string {
 
 // Downloads returns the downloads directory for Agent
 func Downloads() string {
-	if downloadsPath == "" {
-		return filepath.Join(Home(), "downloads")
-	}
 	return downloadsPath
 }
 

internal/pkg/agent/cmd/container.go

@@ -782,11 +782,7 @@ func setPaths(statePath, configPath, logsPath string, writePaths bool) error {
 			return err
 		}
 	}
-	// sync the downloads to the data directory
-	destDownloads := filepath.Join(statePath, "data", "downloads")
-	if err := syncDir(paths.Downloads(), destDownloads); err != nil {
-		return fmt.Errorf("syncing download directory to STATE_PATH(%s) failed: %w", statePath, err)
-	}
+
 	originalInstall := paths.Install()
 	originalTop := paths.Top()
 	paths.SetTop(topPath)
@@ -866,27 +862,6 @@ func tryContainerLoadPaths() error {
 	return setPaths(paths.StatePath, paths.ConfigPath, paths.LogsPath, false)
 }
 
-func syncDir(src string, dest string) error {
-	return filepath.Walk(src, func(path string, info os.FileInfo, err error) error {
-		if err != nil {
-			if os.IsNotExist(err) {
-				// source dir exists only if there's agent artifact
-				return nil
-			}
-			return err
-		}
-		relativePath := strings.TrimPrefix(path, src)
-		if info.IsDir() {
-			err = os.MkdirAll(filepath.Join(dest, relativePath), info.Mode())
-			if err != nil {
-				return err
-			}
-			return nil
-		}
-		return copyFile(filepath.Join(dest, relativePath), path, info.Mode())
-	})
-}
-
 func copyFile(destPath string, srcPath string, mode os.FileMode) error {
 	// if mode is unset; set to the same as the source file
 	if mode == 0 {