From 8f94083a2114c3aef4bc0320065e0374c420ea4a Mon Sep 17 00:00:00 2001
From: Jose M Perez
Date: Thu, 12 Aug 2021 22:48:34 +0200
Subject: Flag -zerodiriv to create all diriv as all zero byte files

---
 internal/fusefrontend/args.go         | 2 ++
 internal/fusefrontend/node_dir_ops.go | 3 ++-
 2 files changed, 4 insertions(+), 1 deletion(-)

(limited to 'internal/fusefrontend')

diff --git a/internal/fusefrontend/args.go b/internal/fusefrontend/args.go
index d92c3ff..02ffddb 100644
--- a/internal/fusefrontend/args.go
+++ b/internal/fusefrontend/args.go
@@ -53,4 +53,6 @@ type Args struct {
 	// like rsync's `--one-file-system` does.
 	// Only applicable to reverse mode.
 	OneFileSystem bool
+	// ZeroDirIV creates diriv files as all-zero files
+	ZeroDirIV bool
 }
diff --git a/internal/fusefrontend/node_dir_ops.go b/internal/fusefrontend/node_dir_ops.go
index 6d03544..b43a4e4 100644
--- a/internal/fusefrontend/node_dir_ops.go
+++ b/internal/fusefrontend/node_dir_ops.go
@@ -35,6 +35,7 @@ func haveDsstore(entries []fuse.DirEntry) bool {
 // should be a handle to the parent directory, cName is the name of the new
 // directory and mode specifies the access permissions to use.
 func (n *Node) mkdirWithIv(dirfd int, cName string, mode uint32, context *fuse.Context) error {
+
 	rn := n.rootNode()
 	// Between the creation of the directory and the creation of gocryptfs.diriv
 	// the directory is inconsistent. Take the lock to prevent other readers
@@ -48,7 +49,7 @@ func (n *Node) mkdirWithIv(dirfd int, cName string, mode uint32, context *fuse.C
 	dirfd2, err := syscallcompat.Openat(dirfd, cName, syscall.O_DIRECTORY|syscall.O_NOFOLLOW|syscallcompat.O_PATH, 0)
 	if err == nil {
 		// Create gocryptfs.diriv
-		err = nametransform.WriteDirIVAt(dirfd2)
+		err = nametransform.WriteDirIVAt(dirfd2, !rn.args.ZeroDirIV)
 		syscall.Close(dirfd2)
 	}
 	if err != nil {
-- 
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