fusego/mount.go

103 lines
2.6 KiB
Go

// Copyright 2015 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package fuse
import (
"fmt"
"os"
"golang.org/x/net/context"
)
// Server is an interface for any type that knows how to serve ops read from a
// connection.
type Server interface {
// Read and serve ops from the supplied connection until EOF. Do not return
// until all operations have been responded to. Must not be called more than
// once.
ServeOps(*Connection)
}
// Mount attempts to mount a file system on the given directory, using the
// supplied Server to serve connection requests. It blocks until the file
// system is successfully mounted.
func Mount(
dir string,
server Server,
config *MountConfig) (mfs *MountedFileSystem, err error) {
// Sanity check: make sure the mount point exists and is a directory. This
// saves us from some confusing errors later on OS X.
fi, err := os.Stat(dir)
switch {
case os.IsNotExist(err):
return
case err != nil:
err = fmt.Errorf("Statting mount point: %v", err)
return
case !fi.IsDir():
err = fmt.Errorf("Mount point %s is not a directory", dir)
return
}
// Initialize the struct.
mfs = &MountedFileSystem{
dir: dir,
joinStatusAvailable: make(chan struct{}),
}
// Begin the mounting process, which will continue in the background.
ready := make(chan error, 1)
dev, err := mount(dir, config, ready)
if err != nil {
err = fmt.Errorf("mount: %v", err)
return
}
// Choose a parent context for ops.
cfgCopy := *config
if cfgCopy.OpContext == nil {
cfgCopy.OpContext = context.Background()
}
// Create a Connection object wrapping the device.
connection, err := newConnection(
cfgCopy,
config.DebugLogger,
config.ErrorLogger,
dev)
if err != nil {
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 mount process to complete.
if err = <-ready; err != nil {
err = fmt.Errorf("mount (background): %v", err)
return
}
return
}