From 84ed139cd2cede9b773fe7892a0bc2515fc1f00f Mon Sep 17 00:00:00 2001
From: Jakob Unterwurzacher
Date: Sun, 2 Aug 2020 19:33:12 +0200
Subject: v2api/reverse: implement Lookup for longname

---
 internal/fusefrontend_reverse/node.go | 46 ++++++++---------------------------
 1 file changed, 10 insertions(+), 36 deletions(-)

(limited to 'internal/fusefrontend_reverse/node.go')

diff --git a/internal/fusefrontend_reverse/node.go b/internal/fusefrontend_reverse/node.go
index 0b2df12..713beee 100644
--- a/internal/fusefrontend_reverse/node.go
+++ b/internal/fusefrontend_reverse/node.go
@@ -10,7 +10,6 @@ import (
 	"github.com/hanwen/go-fuse/v2/fuse"
 
 	"github.com/rfjakob/gocryptfs/internal/configfile"
-	"github.com/rfjakob/gocryptfs/internal/pathiv"
 	"github.com/rfjakob/gocryptfs/internal/syscallcompat"
 )
 
@@ -25,9 +24,16 @@ func (n *Node) Lookup(ctx context.Context, name string, out *fuse.EntryOut) (ch
 	dirfd := int(-1)
 	pName := ""
 	t := n.lookupFileType(name)
-	// gocryptfs.conf
-	if t == typeConfig {
+	if t == typeDiriv {
+		// gocryptfs.diriv
+		return n.lookupDiriv(ctx, out)
+	} else if t == typeName {
+		// gocryptfs.longname.*.name
+		return n.lookupLongnameName(ctx, name, out)
+	} else if t == typeConfig {
+		// gocryptfs.conf
 		var err error
+		pName = configfile.ConfReverseName
 		rn := n.rootNode()
 		dirfd, err = syscallcompat.OpenDirNofollow(rn.args.Cipherdir, "")
 		if err != nil {
@@ -35,34 +41,6 @@ func (n *Node) Lookup(ctx context.Context, name string, out *fuse.EntryOut) (ch
 			return
 		}
 		defer syscall.Close(dirfd)
-		pName = configfile.ConfReverseName
-	} else if t == typeDiriv {
-		// gocryptfs.diriv
-		dirfd, pName, errno = n.prepareAtSyscall("")
-		if errno != 0 {
-			return
-		}
-		defer syscall.Close(dirfd)
-		st, err := syscallcompat.Fstatat2(dirfd, pName, unix.AT_SYMLINK_NOFOLLOW)
-		if err != nil {
-			errno = fs.ToErrno(err)
-			return
-		}
-		content := pathiv.Derive(n.Path(), pathiv.PurposeDirIV)
-		var vf *virtualFile
-		vf, errno = n.newVirtualFile(content, st, inoTagDirIV)
-		if errno != 0 {
-			return nil, errno
-		}
-		out.Attr = vf.attr
-		// Create child node
-		id := fs.StableAttr{Mode: uint32(vf.attr.Mode), Gen: 1, Ino: vf.attr.Ino}
-		ch = n.NewInode(ctx, vf, id)
-		return
-	} else if t == typeName {
-		// gocryptfs.longname.*.name
-
-		// TODO
 	} else if t == typeReal {
 		// real file
 		dirfd, pName, errno = n.prepareAtSyscall(name)
@@ -71,21 +49,17 @@ func (n *Node) Lookup(ctx context.Context, name string, out *fuse.EntryOut) (ch
 		}
 		defer syscall.Close(dirfd)
 	}
-
 	// Get device number and inode number into `st`
 	st, err := syscallcompat.Fstatat2(dirfd, pName, unix.AT_SYMLINK_NOFOLLOW)
 	if err != nil {
 		return nil, fs.ToErrno(err)
 	}
-
 	// Create new inode and fill `out`
 	ch = n.newChild(ctx, st, out)
-
+	// Translate ciphertext size in `out.Attr.Size` to plaintext size
 	if t == typeReal {
-		// Translate ciphertext size in `out.Attr.Size` to plaintext size
 		n.translateSize(dirfd, pName, &out.Attr)
 	}
-
 	return ch, 0
 }
 
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