itd/fuse/main.go

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2023-02-19 11:50:02 +00:00
package main
import (
"log"
"os"
"context"
"syscall"
"github.com/hanwen/go-fuse/v2/fs"
"github.com/hanwen/go-fuse/v2/fuse"
)
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type ITProperty struct {
name string
Ino uint64
}
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type ITNode struct {
fs.Inode
kind int
}
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var properties = []ITProperty {
ITProperty{"heartrate", 2},
ITProperty{"battery", 3},
ITProperty{"motion", 4},
ITProperty{"stepcount", 5},
ITProperty{"version", 6},
ITProperty{"address", 7},
}
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var _ = (fs.NodeReaddirer)((*ITNode)(nil))
// Readdir is part of the NodeReaddirer interface
func (n *ITNode) Readdir(ctx context.Context) (fs.DirStream, syscall.Errno) {
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switch n.kind {
case 0:
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// 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
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case 1:
// device folder
r := make([]fuse.DirEntry, 6)
for ind, value := range properties {
r[ind] = fuse.DirEntry{
Name: value.name,
Ino: value.Ino,
Mode: fuse.S_IFREG,
}
}
return fs.NewListDirStream(r), 0
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}
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) {
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switch n.kind {
case 0:
// root folder
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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
}
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case 1:
// device folder
for _, value := range properties {
if value.name == name {
stable := fs.StableAttr{
Mode: fuse.S_IFREG,
Ino: uint64(value.Ino),
}
operations := &ITNode{kind: 3}
child := n.NewInode(ctx, operations, stable)
return child, 0
}
}
return nil, syscall.ENOENT
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}
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()
}