From 5008cdd4f408ab0e8007f2c847a339ece9f08b80 Mon Sep 17 00:00:00 2001
From: Yannick Ulrich <yannick.ulrich@durham.ac.uk>
Date: Sun, 19 Feb 2023 12:23:44 +0000
Subject: [PATCH] Define reader

---
 fuse/main.go | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/fuse/main.go b/fuse/main.go
index c4580cb..b6c762f 100644
--- a/fuse/main.go
+++ b/fuse/main.go
@@ -106,6 +106,41 @@ func (n *ITNode) Lookup(ctx context.Context, name string, out *fuse.EntryOut) (*
 	return nil, syscall.ENOENT
 }
 
+type bytesFileHandle struct {
+	content []byte
+}
+var _ = (fs.FileReader)((*bytesFileHandle)(nil))
+
+func (fh *bytesFileHandle) Read(ctx context.Context, dest []byte, off int64) (fuse.ReadResult, syscall.Errno) {
+	end := off + int64(len(dest))
+	if end > int64(len(fh.content)) {
+		end = int64(len(fh.content))
+	}
+	return fuse.ReadResultData(fh.content[off:end]), 0
+}
+
+var _ = (fs.NodeOpener)((*ITNode)(nil))
+func (f *ITNode) Open(ctx context.Context, openFlags uint32) (fh fs.FileHandle, fuseFlags uint32, errno syscall.Errno) {
+	switch f.kind {
+	case 3:
+		// Device file
+
+		// disallow writes
+		if fuseFlags&(syscall.O_RDWR|syscall.O_WRONLY) != 0 {
+			return nil, 0, syscall.EROFS
+		}
+
+		for _, value := range properties {
+			if value.Ino == f.Ino {
+				fh = &bytesFileHandle{
+					content: []byte(value.name),
+				}
+				return fh, fuse.FOPEN_DIRECT_IO, 0
+			}
+		}
+	}
+	return nil, 0, syscall.EROFS
+}
 
 func main() {
 	// This is where we'll mount the FS