reverse: move newDirIVFile into virtualfile.go

After all, is's a virtual file.

internal/fusefrontend_reverse/reverse_diriv.go

@@ -1,25 +0,0 @@
-package fusefrontend_reverse
-
-import (
-	"crypto/sha256"
-
-	"github.com/hanwen/go-fuse/fuse"
-	"github.com/hanwen/go-fuse/fuse/nodefs"
-
-	"github.com/rfjakob/gocryptfs/internal/nametransform"
-)
-
-// derivePathIV derives an IV from an encrypted path by hashing it
-func derivePathIV(path string) []byte {
-	hash := sha256.Sum256([]byte(path))
-	return hash[:nametransform.DirIVLen]
-}
-
-func (rfs *reverseFS) newDirIVFile(cRelPath string) (nodefs.File, fuse.Status) {
-	cDir := saneDir(cRelPath)
-	absDir, err := rfs.abs(rfs.decryptPath(cDir))
-	if err != nil {
-		return nil, fuse.ToStatus(err)
-	}
-	return rfs.NewVirtualFile(derivePathIV(cDir), absDir)
-}

internal/fusefrontend_reverse/rpath.go

@@ -1,6 +1,7 @@
 package fusefrontend_reverse
 
 import (
+	"crypto/sha256"
 	"encoding/base64"
 	"path/filepath"
 	"strings"
@@ -18,6 +19,12 @@ func saneDir(path string) string {
 	return d
 }
 
+// derivePathIV derives an IV from an encrypted path by hashing it
+func derivePathIV(path string) []byte {
+	hash := sha256.Sum256([]byte(path))
+	return hash[:nametransform.DirIVLen]
+}
+
 func (rfs *reverseFS) abs(relPath string, err error) (string, error) {
 	if err != nil {
 		return "", err

internal/fusefrontend_reverse/virtualfile.go

@@ -8,6 +8,15 @@ import (
 	"github.com/hanwen/go-fuse/fuse/nodefs"
 )
 
+func (rfs *reverseFS) newDirIVFile(cRelPath string) (nodefs.File, fuse.Status) {
+	cDir := saneDir(cRelPath)
+	absDir, err := rfs.abs(rfs.decryptPath(cDir))
+	if err != nil {
+		return nil, fuse.ToStatus(err)
+	}
+	return rfs.NewVirtualFile(derivePathIV(cDir), absDir)
+}
+
 type virtualFile struct {
 	// Embed nodefs.defaultFile for a ENOSYS implementation of all methods
 	nodefs.File