Drop deprecated "-diriv" option

The DirIV feature flag is already mandatory, dropping the command
line option is the final step.

4 files changed, 9 insertions, 37 deletions

diff --git a/internal/fusefrontend/args.go b/internal/fusefrontend/args.go
index 8520592..4f77973 100644
--- a/internal/fusefrontend/args.go
+++ b/internal/fusefrontend/args.go
@@ -6,7 +6,6 @@ type Args struct {
 	Cipherdir      string
 	OpenSSL        bool
 	PlaintextNames bool
-	DirIV          bool
 	EMENames       bool
 	GCMIV128       bool
 	LongNames      bool
diff --git a/internal/fusefrontend/fs.go b/internal/fusefrontend/fs.go
index 26c9252..4342482 100644
--- a/internal/fusefrontend/fs.go
+++ b/internal/fusefrontend/fs.go
@@ -249,17 +249,10 @@ func (fs *FS) Readlink(path string, context *fuse.Context) (out string, status f
 	if status != fuse.OK {
 		return "", status
 	}
-	// Old filesystem: symlinks are encrypted like paths (CBC)
-	if !fs.args.DirIV {
-		var target string
-		target, err = fs.decryptPath(cTarget)
-		if err != nil {
-			tlog.Warn.Printf("Readlink: CBC decryption failed: %v", err)
-			return "", fuse.EIO
-		}
-		return target, fuse.OK
+	if fs.args.PlaintextNames {
+		return cTarget, fuse.OK
 	}
-	// Since gocryptfs v0.5 symlinks are encrypted like file contents (GCM)
+	// Symlinks are encrypted like file contents (GCM) and base64-encoded
 	cBinTarget, err := base64.URLEncoding.DecodeString(cTarget)
 	if err != nil {
 		tlog.Warn.Printf("Readlink: %v", err)
@@ -316,19 +309,11 @@ func (fs *FS) Symlink(target string, linkName string, context *fuse.Context) (co
 	if err != nil {
 		return fuse.ToStatus(err)
 	}
-	// Before v0.5, symlinks were encrypted like paths (CBC)
-	// TODO drop compatibility and simplify code?
-	if !fs.args.DirIV {
-		var cTarget string
-		cTarget, err = fs.encryptPath(target)
-		if err != nil {
-			tlog.Warn.Printf("Symlink: BUG: we should not get an error here: %v", err)
-			return fuse.ToStatus(err)
-		}
-		err = os.Symlink(cTarget, cPath)
+	if fs.args.PlaintextNames {
+		err = os.Symlink(target, cPath)
 		return fuse.ToStatus(err)
 	}
-
+	// Symlinks are encrypted like file contents (GCM) and base64-encoded
 	cBinTarget := fs.contentEnc.EncryptBlock([]byte(target), 0, nil)
 	cTarget := base64.URLEncoding.EncodeToString(cBinTarget)
 
diff --git a/internal/fusefrontend/fs_dir.go b/internal/fusefrontend/fs_dir.go
index f77486d..80a66ca 100644
--- a/internal/fusefrontend/fs_dir.go
+++ b/internal/fusefrontend/fs_dir.go
@@ -46,9 +46,6 @@ func (fs *FS) Mkdir(newPath string, mode uint32, context *fuse.Context) (code fu
 	if err != nil {
 		return fuse.ToStatus(err)
 	}
-	if !fs.args.DirIV {
-		return fuse.ToStatus(os.Mkdir(cPath, os.FileMode(mode)))
-	}
 	// We need write and execute permissions to create gocryptfs.diriv
 	origMode := mode
 	mode = mode | 0300
@@ -98,9 +95,6 @@ func (fs *FS) Rmdir(path string, context *fuse.Context) (code fuse.Status) {
 	if err != nil {
 		return fuse.ToStatus(err)
 	}
-	if !fs.args.DirIV {
-		return fuse.ToStatus(syscall.Rmdir(cPath))
-	}
 
 	parentDir := filepath.Dir(cPath)
 	parentDirFd, err := os.Open(parentDir)
@@ -215,10 +209,10 @@ func (fs *FS) OpenDir(dirName string, context *fuse.Context) ([]fuse.DirEntry, f
 	if cipherEntries == nil {
 		return nil, status
 	}
-	// Get DirIV (stays nil if DirIV if off)
+	// Get DirIV (stays nil if PlaintextNames is used)
 	var cachedIV []byte
 	var cDirAbsPath string
-	if fs.args.DirIV {
+	if !fs.args.PlaintextNames {
 		// Read the DirIV once and use it for all later name decryptions
 		cDirAbsPath = filepath.Join(fs.args.Cipherdir, cDirName)
 		cachedIV, err = nametransform.ReadDirIV(cDirAbsPath)
@@ -237,7 +231,7 @@ func (fs *FS) OpenDir(dirName string, context *fuse.Context) ([]fuse.DirEntry, f
 			// silently ignore "gocryptfs.conf" in the top level dir
 			continue
 		}
-		if fs.args.DirIV && cName == nametransform.DirIVFilename {
+		if !fs.args.PlaintextNames && cName == nametransform.DirIVFilename {
 			// silently ignore "gocryptfs.diriv" everywhere if dirIV is enabled
 			continue
 		}
diff --git a/internal/fusefrontend/names.go b/internal/fusefrontend/names.go
index 907b6b4..54b41ae 100644
--- a/internal/fusefrontend/names.go
+++ b/internal/fusefrontend/names.go
@@ -44,9 +44,6 @@ func (fs *FS) encryptPath(plainPath string) (string, error) {
 	if fs.args.PlaintextNames {
 		return plainPath, nil
 	}
-	if !fs.args.DirIV {
-		return fs.nameTransform.EncryptPathNoIV(plainPath), nil
-	}
 	fs.dirIVLock.RLock()
 	cPath, err := fs.nameTransform.EncryptPathDirIV(plainPath, fs.args.Cipherdir)
 	tlog.Debug.Printf("encryptPath '%s' -> '%s' (err: %v)", plainPath, cPath, err)
@@ -59,9 +56,6 @@ func (fs *FS) decryptPath(cipherPath string) (string, error) {
 	if fs.args.PlaintextNames {
 		return cipherPath, nil
 	}
-	if !fs.args.DirIV {
-		return fs.nameTransform.DecryptPathNoIV(cipherPath)
-	}
 	fs.dirIVLock.RLock()
 	defer fs.dirIVLock.RUnlock()
 	return fs.nameTransform.DecryptPathDirIV(cipherPath, fs.args.Cipherdir)