From 3a8888c003b721c808e059ab411ca41f848c6e7f Mon Sep 17 00:00:00 2001
From: Yannick Ulrich <yannick.ulrich@durham.ac.uk>
Date: Sun, 19 Feb 2023 11:50:02 +0000
Subject: [PATCH] Added FUSE example

---
 fuse/main.go | 85 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 85 insertions(+)
 create mode 100644 fuse/main.go

diff --git a/fuse/main.go b/fuse/main.go
new file mode 100644
index 0000000..01c4437
--- /dev/null
+++ b/fuse/main.go
@@ -0,0 +1,85 @@
+package main
+
+import (
+	"log"
+	"os"
+    "context"
+    "syscall"
+	"github.com/hanwen/go-fuse/v2/fs"
+	"github.com/hanwen/go-fuse/v2/fuse"
+)
+
+type ITNode struct {
+	fs.Inode
+	kind int
+}
+
+var _ = (fs.NodeReaddirer)((*ITNode)(nil))
+
+// Readdir is part of the NodeReaddirer interface
+func (n *ITNode) Readdir(ctx context.Context) (fs.DirStream, syscall.Errno) {
+	if n.kind == 0 {
+		// root folder
+		r := make([]fuse.DirEntry, 2)
+		r[0] = fuse.DirEntry{
+			Name: "device",
+			Ino:  0,
+			Mode: fuse.S_IFDIR,
+		}
+		r[1] = fuse.DirEntry{
+			Name: "fs",
+			Ino:  1,
+			Mode: fuse.S_IFDIR,
+		}
+		return fs.NewListDirStream(r), 0
+	}
+	r := make([]fuse.DirEntry, 0)
+	return fs.NewListDirStream(r), 0
+}
+
+var _ = (fs.NodeLookuper)((*ITNode)(nil))
+func (n *ITNode) Lookup(ctx context.Context, name string, out *fuse.EntryOut) (*fs.Inode, syscall.Errno) {
+	if n.kind == 0 {
+		if name == "device" {
+			stable := fs.StableAttr{
+				Mode: fuse.S_IFDIR,
+				Ino: uint64(0),
+			}
+			operations := &ITNode{kind: 1}
+			child := n.NewInode(ctx, operations, stable)
+			return child, 0
+		} else if name == "fs" {
+			stable := fs.StableAttr{
+				Mode: fuse.S_IFDIR,
+				Ino: uint64(1),
+			}
+			operations := &ITNode{kind: 2}
+			child := n.NewInode(ctx, operations, stable)
+			return child, 0
+		}
+	}
+	return nil, syscall.ENOENT
+}
+
+
+func main() {
+	// This is where we'll mount the FS
+	mntDir := "/tmp/x"
+	os.Mkdir(mntDir, 0755)
+	root := &ITNode{kind: 0}
+	server, err := fs.Mount(mntDir, root, &fs.Options{
+		MountOptions: fuse.MountOptions{
+			// Set to true to see how the file system works.
+			Debug: false,
+		},
+	})
+	if err != nil {
+		log.Panic(err)
+	}
+
+	log.Printf("Mounted on %s", mntDir)
+	log.Printf("Unmount by calling 'fusermount -u %s'", mntDir)
+
+	// Wait until unmount before exiting
+	server.Wait()
+}