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Added FUSE support (#55)

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This exposes the watches' file system over FUSE. This way, we can access files on the watch without having to go through `itctl` or developing 3rd party tools.

**Features**

- [x] read/write access to the file system
- [x] read access to momentary sensor data
- [x] live access to sensor data (i.e. WatchMotion rather than Motion)
- [x] configuration of mount point

Co-authored-by: Yannick Ulrich <yannick.ulrich@durham.ac.uk>
Reviewed-on: https://gitea.arsenm.dev/Arsen6331/itd/pulls/55
Co-authored-by: yannickulrich <yannick.ulrich@protonmail.com>
Co-committed-by: yannickulrich <yannick.ulrich@protonmail.com>
This commit is contained in:
yannickulrich
2023-03-25 22:23:51 +00:00
committed by Arsen6331
parent 4cdd47311f
commit 9ecd45dadd
8 changed files with 728 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
config.go
View File

@@ -106,5 +106,8 @@ func setCfgDefaults() {
"notifs.ignore.body": []string{},
"music.vol.interval": 5,
"fuse.enabled": false,
"fuse.mountpoint": "/tmp/itd/mnt",
}, "."), nil)
}

60
fuse.go Normal file
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@@ -0,0 +1,60 @@
package main
import (
"go.arsenm.dev/itd/internal/fusefs"
"os"
"github.com/hanwen/go-fuse/v2/fs"
"github.com/hanwen/go-fuse/v2/fuse"
"go.arsenm.dev/logger/log"
"context"
"go.arsenm.dev/infinitime"
)
func startFUSE(ctx context.Context, dev *infinitime.Device) error {
// This is where we'll mount the FS
err := os.MkdirAll(k.String("fuse.mountpoint"), 0755)
if err != nil && !os.IsExist(err) {
return err
}
// Ignore the error because nothing might be mounted on the mountpoint
_ = fusefs.Unmount(k.String("fuse.mountpoint"))
root, err := fusefs.BuildRootNode(dev)
if err != nil {
log.Error("Building root node failed").
Err(err).
Send()
return err
}
server, err := fs.Mount(k.String("fuse.mountpoint"), root, &fs.Options{
MountOptions: fuse.MountOptions{
// Set to true to see how the file system works.
Debug: false,
SingleThreaded: true,
},
})
if err != nil {
log.Error("Mounting failed").
Str("target", k.String("fuse.mountpoint")).
Err(err).
Send()
return err
}
log.Info("Mounted on target").
Str("target", k.String("fuse.mountpoint")).
Send()
fusefs.BuildProperties(dev)
if err != nil {
log.Warn("Error getting BLE filesystem").Err(err).Send()
return err
}
// Wait until unmount before exiting
go server.Serve()
return nil
}

1
go.mod
View File

@@ -45,6 +45,7 @@ require (
github.com/google/uuid v1.3.0 // indirect
github.com/gookit/color v1.5.1 // indirect
github.com/gopherjs/gopherjs v1.17.2 // indirect
github.com/hanwen/go-fuse/v2 v2.2.0 // indirect
github.com/hashicorp/yamux v0.1.1 // indirect
github.com/jsummers/gobmp v0.0.0-20151104160322-e2ba15ffa76e // indirect
github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51 // indirect

2
go.sum
View File

@@ -257,6 +257,8 @@ github.com/goxjs/gl v0.0.0-20210104184919-e3fafc6f8f2a/go.mod h1:dy/f2gjY09hwVfI
github.com/goxjs/glfw v0.0.0-20191126052801-d2efb5f20838/go.mod h1:oS8P8gVOT4ywTcjV6wZlOU4GuVFQ8F5328KY3MJ79CY=
github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0/go.mod h1:8NvIoxWQoOIhqOTXgfV/d3M/q6VIi02HzZEHgUlZvzk=
github.com/grpc-ecosystem/grpc-gateway v1.16.0/go.mod h1:BDjrQk3hbvj6Nolgz8mAMFbcEtjT1g+wF4CSlocrBnw=
github.com/hanwen/go-fuse/v2 v2.2.0 h1:jo5QZYmBLNcl9ovypWaQ5yXMSSV+Ch68xoC3rtZvvBM=
github.com/hanwen/go-fuse/v2 v2.2.0/go.mod h1:B1nGE/6RBFyBRC1RRnf23UpwCdyJ31eukw34oAKukAc=
github.com/hashicorp/consul/api v1.1.0/go.mod h1:VmuI/Lkw1nC05EYQWNKwWGbkg+FbDBtguAZLlVdkD9Q=
github.com/hashicorp/consul/api v1.13.0/go.mod h1:ZlVrynguJKcYr54zGaDbaL3fOvKC9m72FhPvA8T35KQ=
github.com/hashicorp/consul/sdk v0.1.1/go.mod h1:VKf9jXwCTEY1QZP2MOLRhb5i/I/ssyNV1vwHyQBF0x8=

572
internal/fusefs/fuse.go Normal file
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@@ -0,0 +1,572 @@
package fusefs
import (
"go.arsenm.dev/infinitime"
"go.arsenm.dev/infinitime/blefs"
"go.arsenm.dev/logger/log"
"context"
"syscall"
"github.com/hanwen/go-fuse/v2/fs"
"github.com/hanwen/go-fuse/v2/fuse"
"io"
"bytes"
"strconv"
)
type ITProperty struct {
name string
Ino uint64
gen func() ([]byte, error)
}
type DirEntry struct {
isDir bool
modtime uint64
size uint32
path string
}
type ITNode struct {
fs.Inode
kind int
Ino uint64
lst []DirEntry
self DirEntry
path string
}
var myfs *blefs.FS = nil
var inodemap map[string]uint64 = nil
func BuildRootNode(dev *infinitime.Device) (*ITNode, error) {
var err error
inodemap = make(map[string]uint64)
myfs, err = dev.FS()
if err != nil {
log.Error("FUSE Failed to get filesystem").Err(err).Send()
return nil, err
}
return &ITNode{kind: 0}, nil
}
var properties = make([]ITProperty, 6)
func BuildProperties(dev *infinitime.Device) {
properties[0] = ITProperty{"heartrate", 2,
func() ([]byte, error) {
ans, err := dev.HeartRate()
return []byte(strconv.Itoa(int(ans)) + "\n"), err
}}
properties[1] = ITProperty{"battery", 3,
func() ([]byte, error) {
ans, err := dev.BatteryLevel()
return []byte(strconv.Itoa(int(ans)) + "\n"), err
}}
properties[2] = ITProperty{"motion", 4,
func() ([]byte, error) {
ans, err := dev.Motion()
return []byte(strconv.Itoa(int(ans.X)) + " " + strconv.Itoa(int(ans.Y)) + " " + strconv.Itoa(int(ans.Z)) + "\n"), err
}}
properties[3] = ITProperty{"stepcount", 6,
func() ([]byte, error) {
ans, err := dev.StepCount()
return []byte(strconv.Itoa(int(ans)) + "\n"), err
}}
properties[4] = ITProperty{"version", 7,
func() ([]byte, error) {
ans, err := dev.Version()
return []byte(ans + "\n"), err
}}
properties[5] = ITProperty{"address", 8,
func() ([]byte, error) {
ans := dev.Address()
return []byte(ans + "\n"), nil
}}
}
var _ fs.NodeReaddirer = (*ITNode)(nil)
// Readdir is part of the NodeReaddirer interface
func (n *ITNode) Readdir(ctx context.Context) (fs.DirStream, syscall.Errno) {
switch n.kind {
case 0:
// root folder
r := make([]fuse.DirEntry, 2)
r[0] = fuse.DirEntry{
Name: "info",
Ino: 0,
Mode: fuse.S_IFDIR,
}
r[1] = fuse.DirEntry{
Name: "fs",
Ino: 1,
Mode: fuse.S_IFDIR,
}
return fs.NewListDirStream(r), 0
case 1:
// info 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
case 2:
// on info
files, err := myfs.ReadDir(n.path)
if err != nil {
log.Error("FUSE ReadDir failed").Str("path", n.path).Err(err).Send()
return nil, syscallErr(err)
}
log.Debug("FUSE ReadDir succeeded").Str("path", n.path).Int("objects", len(files)).Send()
r := make([]fuse.DirEntry, len(files))
n.lst = make([]DirEntry, len(files))
for ind, entry := range files {
info, err := entry.Info()
if err != nil {
log.Error("FUSE Info failed").Str("path", n.path).Err(err).Send()
return nil, syscallErr(err)
}
name := info.Name()
file := DirEntry{
path: n.path + "/" + name,
size: uint32(info.Size()),
modtime: uint64(info.ModTime().Unix()),
isDir: info.IsDir(),
}
n.lst[ind] = file
ino := inodemap[file.path]
if ino == 0 {
ino = uint64(len(inodemap)) + 1
inodemap[file.path] = ino
}
if file.isDir {
r[ind] = fuse.DirEntry{
Name: name,
Mode: fuse.S_IFDIR,
Ino : ino + 10,
}
} else {
r[ind] = fuse.DirEntry{
Name: name,
Mode: fuse.S_IFREG,
Ino : ino + 10,
}
}
}
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) {
switch n.kind {
case 0:
// root folder
if name == "info" {
stable := fs.StableAttr{
Mode: fuse.S_IFDIR,
Ino: uint64(0),
}
operations := &ITNode{kind: 1, Ino: 0}
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, Ino: 1, path : ""}
child := n.NewInode(ctx, operations, stable)
return child, 0
}
case 1:
// info folder
for _, value := range properties {
if value.name == name {
stable := fs.StableAttr{
Mode: fuse.S_IFREG,
Ino: uint64(value.Ino),
}
operations := &ITNode{kind: 3, Ino: value.Ino}
child := n.NewInode(ctx, operations, stable)
return child, 0
}
}
case 2:
// FS object
if len(n.lst) == 0 {
n.Readdir(ctx)
}
for _, file := range n.lst {
if file.path != n.path + "/" + name {
continue
}
log.Debug("FUSE Lookup successful").Str("path", file.path).Send()
if file.isDir {
stable := fs.StableAttr{
Mode: fuse.S_IFDIR,
Ino: inodemap[file.path],
}
operations := &ITNode{kind: 2, path: file.path}
child := n.NewInode(ctx, operations, stable)
return child, 0
} else {
stable := fs.StableAttr{
Mode: fuse.S_IFREG,
Ino: inodemap[file.path],
}
operations := &ITNode{
kind: 2, path: file.path,
self: file,
}
child := n.NewInode(ctx, operations, stable)
return child, 0
}
break
}
log.Warn("FUSE Lookup failed").Str("path", n.path + "/" + name).Send()
}
return nil, syscall.ENOENT
}
type bytesFileReadHandle struct {
content []byte
}
var _ fs.FileReader = (*bytesFileReadHandle)(nil)
func (fh *bytesFileReadHandle) Read(ctx context.Context, dest []byte, off int64) (fuse.ReadResult, syscall.Errno) {
log.Debug("FUSE Executing Read").Int("size", len(fh.content)).Send()
end := off + int64(len(dest))
if end > int64(len(fh.content)) {
end = int64(len(fh.content))
}
return fuse.ReadResultData(fh.content[off:end]), 0
}
type sensorFileReadHandle struct {
content []byte
}
var _ fs.FileReader = (*sensorFileReadHandle)(nil)
func (fh *sensorFileReadHandle) Read(ctx context.Context, dest []byte, off int64) (fuse.ReadResult, syscall.Errno) {
log.Info("Executing Read").Int("size", len(fh.content)).Send()
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.FileFlusher = (*sensorFileReadHandle)(nil)
func (fh *sensorFileReadHandle) Flush(ctx context.Context) (errno syscall.Errno) {
return 0
}
type bytesFileWriteHandle struct {
content []byte
path string
}
var _ fs.FileWriter = (*bytesFileWriteHandle)(nil)
func (fh *bytesFileWriteHandle) Write(ctx context.Context, data []byte, off int64) (written uint32, errno syscall.Errno) {
log.Info("Executing Write").Str("path", fh.path).Int("prev_size", len(fh.content)).Int("next_size", len(data)).Send()
if off != int64(len(fh.content)) {
log.Error("FUSE Write file size changed unexpectedly").Int("expect", int(off)).Int("received", len(fh.content)).Send()
return 0, syscall.ENXIO
}
fh.content = append(fh.content[:], data[:]...)
return uint32(len(data)), 0
}
var _ fs.FileFlusher = (*bytesFileWriteHandle)(nil)
func (fh *bytesFileWriteHandle) Flush(ctx context.Context) (errno syscall.Errno) {
log.Debug("FUSE Attempting flush").Str("path", fh.path).Send()
fp, err := myfs.Create(fh.path, uint32(len(fh.content)))
if err != nil {
log.Error("FUSE Flush failed: create").Str("path", fh.path).Err(err).Send()
return syscallErr(err)
}
if len(fh.content) == 0 {
log.Debug("FUSE Flush no data to write").Str("path", fh.path).Send()
err = fp.Close()
if err != nil {
log.Error("FUSE Flush failed during close").Str("path", fh.path).Err(err).Send()
return syscallErr(err)
}
return 0
}
go func() {
// For every progress event
for sent := range fp.Progress() {
log.Debug("FUSE Flush progress").Int("bytes", int(sent)).Int("total", len(fh.content)).Send()
}
}()
r := bytes.NewReader(fh.content)
nread, err := io.Copy(fp, r)
if err != nil {
log.Error("FUSE Flush failed during write").Str("path", fh.path).Err(err).Send()
fp.Close()
return syscallErr(err)
}
if int(nread) != len(fh.content) {
log.Error("FUSE Flush failed during write").Str("path", fh.path).Int("expect", len(fh.content)).Int("got", int(nread)).Send()
fp.Close()
return syscall.EIO
}
err = fp.Close()
if err != nil {
log.Error("FUSE Flush failed during close").Str("path", fh.path).Err(err).Send()
return syscallErr(err)
}
log.Debug("FUSE Flush done").Str("path", fh.path).Int("size", len(fh.content)).Send()
return 0
}
var _ fs.FileFsyncer = (*bytesFileWriteHandle)(nil)
func (fh *bytesFileWriteHandle) Fsync(ctx context.Context, flags uint32) (errno syscall.Errno) {
return fh.Flush(ctx)
}
var _ fs.NodeGetattrer = (*ITNode)(nil)
func (bn *ITNode) Getattr(ctx context.Context, f fs.FileHandle, out *fuse.AttrOut) syscall.Errno {
log.Debug("FUSE getattr").Str("path", bn.path).Send()
out.Ino = bn.Ino
out.Mtime = bn.self.modtime
out.Ctime = bn.self.modtime
out.Atime = bn.self.modtime
out.Size = uint64(bn.self.size)
return 0
}
var _ fs.NodeSetattrer = (*ITNode)(nil)
func (bn *ITNode) Setattr(ctx context.Context, fh fs.FileHandle, in *fuse.SetAttrIn, out *fuse.AttrOut) syscall.Errno {
log.Debug("FUSE setattr").Str("path", bn.path).Send()
out.Size = 0
out.Mtime = 0
return 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 2:
// FS file
if openFlags&syscall.O_RDWR != 0 {
log.Error("FUSE Open failed: RDWR").Str("path", f.path).Send()
return nil, 0, syscall.EROFS
}
if openFlags & syscall.O_WRONLY != 0 {
log.Debug("FUSE Opening for write").Str("path", f.path).Send()
fh = &bytesFileWriteHandle{
path : f.path,
content : make([]byte, 0),
}
return fh, fuse.FOPEN_DIRECT_IO, 0
} else {
log.Debug("FUSE Opening for read").Str("path", f.path).Send()
fp, err := myfs.Open(f.path)
if err != nil {
log.Error("FUSE: Opening failed").Str("path", f.path).Err(err).Send()
return nil, 0, syscallErr(err)
}
defer fp.Close()
b := &bytes.Buffer{}
go func() {
// For every progress event
for sent := range fp.Progress() {
log.Debug("FUSE Read progress").Int("bytes", int(sent)).Int("total", int(f.self.size)).Send()
}
}()
_, err = io.Copy(b, fp)
if err != nil {
log.Error("FUSE Read failed").Str("path", f.path).Err(err).Send()
fp.Close()
return nil, 0, syscallErr(err)
}
fh = &bytesFileReadHandle{
content: b.Bytes(),
}
return fh, fuse.FOPEN_DIRECT_IO, 0
}
case 3:
// Device file
// disallow writes
if openFlags&(syscall.O_RDWR|syscall.O_WRONLY) != 0 {
return nil, 0, syscall.EROFS
}
for _, value := range properties {
if value.Ino == f.Ino {
ans, err := value.gen()
if err != nil {
return nil, 0, syscallErr(err)
}
fh = &sensorFileReadHandle{
content : ans,
}
return fh, fuse.FOPEN_DIRECT_IO, 0
}
}
}
return nil, 0, syscall.EINVAL
}
var _ fs.NodeCreater = (*ITNode)(nil)
func (f *ITNode) Create(ctx context.Context, name string, flags uint32, mode uint32, out *fuse.EntryOut) (node *fs.Inode, fh fs.FileHandle, fuseFlags uint32, errno syscall.Errno) {
if f.kind != 2 {
return nil, nil, 0, syscall.EROFS
}
path := f.path + "/" + name
ino := uint64(len(inodemap)) + 11
inodemap[path] = ino
stable := fs.StableAttr{
Mode: fuse.S_IFREG,
Ino: ino,
}
operations := &ITNode{
kind: 2, Ino: ino,
path : path,
}
node = f.NewInode(ctx, operations, stable)
fh = &bytesFileWriteHandle{
path : path,
content : make([]byte, 0),
}
log.Debug("FUSE Creating file").Str("path", path).Send()
errno = 0
return node, fh, fuseFlags, 0
}
var _ fs.NodeMkdirer = (*ITNode)(nil)
func (f *ITNode) Mkdir(ctx context.Context, name string, mode uint32, out *fuse.EntryOut) (*fs.Inode, syscall.Errno) {
if f.kind != 2 {
return nil, syscall.EROFS
}
path := f.path + "/" + name
err := myfs.Mkdir(path)
if err != nil {
log.Error("FUSE Mkdir failed").
Str("path", path).
Err(err).
Send()
return nil, syscallErr(err)
}
ino := uint64(len(inodemap)) + 11
inodemap[path] = ino
stable := fs.StableAttr{
Mode: fuse.S_IFDIR,
Ino: ino,
}
operations := &ITNode{
kind: 2, Ino: ino,
path : path,
}
node := f.NewInode(ctx, operations, stable)
log.Debug("FUSE Mkdir success").
Str("path", path).
Int("ino", int(ino)).
Send()
return node, 0
}
var _ fs.NodeRenamer = (*ITNode)(nil)
func (f *ITNode) Rename(ctx context.Context, name string, newParent fs.InodeEmbedder, newName string, flags uint32) syscall.Errno {
if f.kind != 2 {
return syscall.EROFS
}
p1 := f.path + "/" + name
p2 := newParent.EmbeddedInode().Path(nil)[2:] + "/" + newName
err := myfs.Rename(p1, p2)
if err != nil {
log.Error("FUSE Rename failed").
Str("src", p1).
Str("dest", p2).
Err(err).
Send()
return syscallErr(err)
}
log.Debug("FUSE Rename sucess").
Str("src", p1).
Str("dest", p2).
Send()
ino := inodemap[p1]
delete(inodemap, p1)
inodemap[p2] = ino
return 0
}
var _ fs.NodeUnlinker = (*ITNode)(nil)
func (f *ITNode) Unlink(ctx context.Context, name string) syscall.Errno {
if f.kind != 2 {
return syscall.EROFS
}
delete(inodemap, f.path + "/" + name)
err := myfs.Remove(f.path + "/" + name)
if err != nil {
log.Error("FUSE Unlink failed").
Str("file", f.path + "/" + name).
Err(err).
Send()
return syscallErr(err)
}
log.Debug("FUSE Unlink success").
Str("file", f.path + "/" + name).
Send()
return 0
}
var _ fs.NodeRmdirer = (*ITNode)(nil)
func (f *ITNode) Rmdir(ctx context.Context, name string) syscall.Errno {
return f.Unlink(ctx, name)
}

67
internal/fusefs/syscallerr.go Normal file
View File

@@ -0,0 +1,67 @@
package fusefs
import (
"go.arsenm.dev/infinitime/blefs"
"syscall"
)
func syscallErr(err error) syscall.Errno {
if err == nil {
return 0
}
switch err {
case blefs.FSError{0x02}: // filesystem error
return syscall.EIO // TODO
case blefs.FSError{0x05}: // read-only filesystem
return syscall.EROFS
case blefs.FSError{0x03}: // no such file
return syscall.ENOENT
case blefs.FSError{0x04}: // protocol error
return syscall.EPROTO
case blefs.FSError{-5}: // input/output error
return syscall.EIO
case blefs.FSError{-84}: // filesystem is corrupted
return syscall.ENOTRECOVERABLE // TODO
case blefs.FSError{-2}: // no such directory entry
return syscall.ENOENT
case blefs.FSError{-17}: // entry already exists
return syscall.EEXIST
case blefs.FSError{-20}: // entry is not a directory
return syscall.ENOTDIR
case blefs.FSError{-39}: // directory is not empty
return syscall.ENOTEMPTY
case blefs.FSError{-9}: // bad file number
return syscall.EBADF
case blefs.FSError{-27}: // file is too large
return syscall.EFBIG
case blefs.FSError{-22}: // invalid parameter
return syscall.EINVAL
case blefs.FSError{-28}: // no space left on device
return syscall.ENOSPC
case blefs.FSError{-12}: // no more memory available
return syscall.ENOMEM
case blefs.FSError{-61}: // no attr available
return syscall.ENODATA // TODO
case blefs.FSError{-36}: // file name is too long
return syscall.ENAMETOOLONG
case blefs.ErrFileNotExists: // file does not exist
return syscall.ENOENT
case blefs.ErrFileReadOnly: // file is read only
return syscall.EACCES
case blefs.ErrFileWriteOnly: // file is write only
return syscall.EACCES
case blefs.ErrInvalidOffset: // invalid file offset
return syscall.EFAULT // TODO
case blefs.ErrOffsetChanged: // offset has already been changed
return syscall.ESPIPE
case blefs.ErrReadOpen: // only one file can be opened for reading at a time
return syscall.ENFILE
case blefs.ErrWriteOpen: // only one file can be opened for writing at a time
return syscall.ENFILE
case blefs.ErrNoRemoveRoot: // refusing to remove root directory
return syscall.EPERM
}
return syscall.EIO // TODO
}

15
internal/fusefs/unmount.go Normal file
View File

@@ -0,0 +1,15 @@
package fusefs
import (
_ "unsafe"
"github.com/hanwen/go-fuse/v2/fuse"
)
func Unmount(mountPoint string) error {
return unmount(mountPoint, &fuse.MountOptions{DirectMount: false})
}
// Unfortunately, the FUSE library does not export its unmount function,
// so this is required until that changes
//go:linkname unmount github.com/hanwen/go-fuse/v2/fuse.unmount
func unmount(mountPoint string, opts *fuse.MountOptions) error

8
main.go
View File

@@ -181,6 +181,14 @@ func main() {
log.Error("Error intializing puremaps integration").Err(err).Send()
}
// Start fuse socket
if k.Bool("fuse.enabled") {
err = startFUSE(ctx, dev)
if err != nil {
log.Error("Error starting fuse socket").Err(err).Send()
}
}
// Start control socket
err = startSocket(ctx, dev)
if err != nil {