func main() {
flag.Usage = usage
flag.Parse()
if flag.NArg() != 1 {
usage()
os.Exit(2)
}
mountpoint := flag.Arg(0)
c, err := fuse.Mount(
mountpoint,
fuse.FSName("clock"),
fuse.Subtype("clockfsfs"),
fuse.LocalVolume(),
fuse.VolumeName("Clock filesystem"),
)
if err != nil {
log.Fatal(err)
}
defer c.Close()
srv := fs.New(c, nil)
filesys := &FS{
// We pre-create the clock node so that it's always the same
// object returned from all the Lookups. You could carefully
// track its lifetime between Lookup&Forget, and have the
// ticking & invalidation happen only when active, but let's
// keep this example simple.
clockFile: &File{
fuse: srv,
},
}
filesys.clockFile.tick()
// This goroutine never exits. That's fine for this example.
go filesys.clockFile.update()
if err := srv.Serve(filesys); err != nil {
log.Fatal(err)
}
// Check if the mount process has an error to report.
<-c.Ready
if err := c.MountError; err != nil {
log.Fatal(err)
}
}
// Mounted mounts the fuse.Server at a temporary directory.
//
// It also waits until the filesystem is known to be visible (OS X
// workaround).
//
// After successful return, caller must clean up by calling Close.
func Mounted(filesys fs.FS, conf *fs.Config, options ...fuse.MountOption) (*Mount, error) {
dir, err := ioutil.TempDir("", "fusetest")
if err != nil {
return nil, err
}
c, err := fuse.Mount(dir, options...)
if err != nil {
return nil, err
}
server := fs.New(c, conf)
done := make(chan struct{})
serveErr := make(chan error, 1)
mnt := &Mount{
Dir: dir,
Conn: c,
Server: server,
Error: serveErr,
done: done,
}
go func() {
defer close(done)
serveErr <- server.Serve(filesys)
}()
select {
case <-mnt.Conn.Ready:
if err := mnt.Conn.MountError; err != nil {
return nil, err
}
return mnt, nil
case err = <-mnt.Error:
// Serve quit early
if err != nil {
return nil, err
}
return nil, errors.New("Serve exited early")
}
}
// Attempt to mount a file system on the given directory, using the supplied
// Server to serve connection requests. This function blocks until the file
// system is successfully mounted.
func Mount(
dir string,
server Server,
config *MountConfig) (mfs *MountedFileSystem, err error) {
// Arrange for a non-nil debug logger.
debugLogger := config.DebugLogger
if debugLogger == nil {
debugLogger = log.New(ioutil.Discard, "", 0)
}
// Initialize the struct.
mfs = &MountedFileSystem{
dir: dir,
joinStatusAvailable: make(chan struct{}),
}
// Open a bazilfuse connection.
debugLogger.Println("Opening a bazilfuse connection.")
bfConn, err := bazilfuse.Mount(mfs.dir, config.bazilfuseOptions()...)
if err != nil {
err = fmt.Errorf("bazilfuse.Mount: %v", err)
return
}
// Choose a parent context for ops.
opContext := config.OpContext
if opContext == nil {
opContext = context.Background()
}
// Create a /dev/null error logger if necessary.
errorLogger := config.ErrorLogger
if errorLogger == nil {
errorLogger = log.New(ioutil.Discard, "", 0)
}
// Create our own Connection object wrapping it.
connection, err := newConnection(
opContext,
debugLogger,
errorLogger,
bfConn)
if err != nil {
bfConn.Close()
err = fmt.Errorf("newConnection: %v", err)
return
}
// Serve the connection in the background. When done, set the join status.
go func() {
server.ServeOps(connection)
mfs.joinStatus = connection.close()
close(mfs.joinStatusAvailable)
}()
// Wait for the connection to say it is ready.
if err = connection.waitForReady(); err != nil {
err = fmt.Errorf("WaitForReady: %v", err)
return
}
return
}