fusefrontend: Introduce a openBackingPath helper and use it to simplify Mknod and Symlink

1 files changed, 15 insertions, 0 deletions

diff --git a/internal/fusefrontend/names.go b/internal/fusefrontend/names.go
index 3833479..9be2623 100644
--- a/internal/fusefrontend/names.go
+++ b/internal/fusefrontend/names.go
@@ -3,6 +3,7 @@ package fusefrontend
 // This file forwards file encryption operations to cryptfs
 
 import (
+	"os"
 	"path/filepath"
 
 	"github.com/rfjakob/gocryptfs/internal/configfile"
@@ -39,6 +40,20 @@ func (fs *FS) getBackingPath(relPath string) (string, error) {
 	return cAbsPath, nil
 }
 
+// openBackingPath - get the absolute encrypted path of the backing file
+// and open the corresponding directory
+func (fs *FS) openBackingPath(relPath string) (*os.File, string, error) {
+	cPath, err := fs.getBackingPath(relPath)
+	if err != nil {
+		return nil, "", err
+	}
+	dirfd, err := os.Open(filepath.Dir(cPath))
+	if err != nil {
+		return nil, "", err
+	}
+	return dirfd, filepath.Base(cPath), nil
+}
+
 // encryptPath - encrypt relative plaintext path
 func (fs *FS) encryptPath(plainPath string) (string, error) {
 	if fs.args.PlaintextNames {