move fs and file ownership related funcs to fs package

internal/machine/corroservice/config.go

@@ -6,9 +6,7 @@ import (
 	"github.com/BurntSushi/toml"
 	"net/netip"
 	"os"
-	"os/user"
-	"path/filepath"
-	"strconv"
+	"uncloud/internal/fs"
 )
 
 const (
@@ -54,46 +52,8 @@ func (c *Config) Write(path, owner string) error {
 	if err := os.WriteFile(path, data.Bytes(), 0600); err != nil {
 		return err
 	}
-	if err := Chown(path, owner); err != nil {
+	if err := fs.Chown(path, owner); err != nil {
 		return err
 	}
 	return nil
 }
-
-func MkDataDir(dir, owner string) error {
-	parent, _ := filepath.Split(dir)
-	// Use 0711 for parent directories to allow `owner` to access its nested data directory.
-	if err := os.MkdirAll(parent, 0711); err != nil {
-		return fmt.Errorf("create directory %q: %w", parent, err)
-	}
-	if err := os.Mkdir(dir, 0700); err != nil {
-		if !os.IsExist(err) {
-			return fmt.Errorf("create directory %q: %w", dir, err)
-		}
-	}
-	if err := Chown(dir, owner); err != nil {
-		return err
-	}
-	return nil
-}
-
-func Chown(path, owner string) error {
-	if owner != "" {
-		usr, err := user.Lookup(owner)
-		if err != nil {
-			return fmt.Errorf("lookup user %q: %w", owner, err)
-		}
-		uid, err := strconv.Atoi(usr.Uid)
-		if err != nil {
-			return fmt.Errorf("parse %q user ID (UID) %q: %w", owner, usr.Uid, err)
-		}
-		gid, err := strconv.Atoi(usr.Gid)
-		if err != nil {
-			return fmt.Errorf("parse %q user group ID (GID) %q: %w", owner, usr.Gid, err)
-		}
-		if err = os.Chown(path, uid, gid); err != nil {
-			return fmt.Errorf("chown %q: %w", path, err)
-		}
-	}
-	return nil
-}