forked from kahing/goofys
/
main.go
171 lines (138 loc) · 3.78 KB
/
main.go
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// Copyright 2015 Ka-Hing Cheung
// 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 main
import (
"fmt"
"log"
"os"
"os/signal"
"golang.org/x/net/context"
"github.com/aws/aws-sdk-go/aws"
"github.com/codegangsta/cli"
"github.com/jacobsa/fuse"
"github.com/jacobsa/fuse/fuseutil"
"github.com/jacobsa/syncutil"
)
func registerSIGINTHandler(mountPoint string) {
// Register for SIGINT.
signalChan := make(chan os.Signal, 1)
signal.Notify(signalChan, os.Interrupt)
// Start a goroutine that will unmount when the signal is received.
go func() {
for {
<-signalChan
log.Println("Received SIGINT, attempting to unmount...")
err := fuse.Unmount(mountPoint)
if err != nil {
log.Printf("Failed to unmount in response to SIGINT: %v", err)
} else {
log.Printf("Successfully unmounted in response to SIGINT.")
return
}
}
}()
}
// Mount the file system based on the supplied arguments, returning a
// fuse.MountedFileSystem that can be joined to wait for unmounting.
func mount(
ctx context.Context,
bucketName string,
mountPoint string,
flags *flagStorage) (mfs *fuse.MountedFileSystem, err error) {
// Choose UID and GID.
uid, gid, err := MyUserAndGroup()
if err != nil {
err = fmt.Errorf("MyUserAndGroup: %v", err)
return
}
if flags.Uid >= 0 {
uid = uint32(flags.Uid)
}
if flags.Gid >= 0 {
gid = uint32(flags.Gid)
}
if err != nil {
err = fmt.Errorf("setUpBucket: %v", err)
return
}
awsConfig := &aws.Config{
Region: aws.String("us-west-2"),
//LogLevel: aws.LogLevel(aws.LogDebug),
}
server := fuseutil.NewFileSystemServer(NewGoofys(bucketName, awsConfig, uid, gid))
// Mount the file system.
mountCfg := &fuse.MountConfig{
FSName: bucketName,
Options: flags.MountOptions,
ErrorLogger: log.New(os.Stderr, "fuse: ", log.Flags()),
}
if flags.DebugFuse {
mountCfg.DebugLogger = log.New(os.Stderr, "fuse_debug: ", 0)
}
mfs, err = fuse.Mount(mountPoint, server, mountCfg)
if err != nil {
err = fmt.Errorf("Mount: %v", err)
return
}
return
}
func main() {
// Make logging output better.
log.SetFlags(log.Ldate | log.Ltime | log.Lmicroseconds)
app := newApp()
app.Action = func(c *cli.Context) {
var err error
// We should get two arguments exactly. Otherwise error out.
if len(c.Args()) != 2 {
fmt.Fprintf(
os.Stderr,
"Error: %s takes exactly two arguments.\n\n",
app.Name)
cli.ShowAppHelp(c)
os.Exit(1)
}
// Populate and parse flags.
bucketName := c.Args()[0]
mountPoint := c.Args()[1]
flags := populateFlags(c)
// Enable invariant checking if requested.
if flags.DebugInvariants {
syncutil.EnableInvariantChecking()
}
// Mount the file system.
mfs, err := mount(
context.Background(),
bucketName,
mountPoint,
flags)
if err != nil {
log.Fatalf("Mounting file system: %v", err)
}
log.Println("File system has been successfully mounted.")
// Let the user unmount with Ctrl-C (SIGINT).
registerSIGINTHandler(mfs.Dir())
// Wait for the file system to be unmounted.
err = mfs.Join(context.Background())
if err != nil {
err = fmt.Errorf("MountedFileSystem.Join: %v", err)
return
}
log.Println("Successfully exiting.")
}
err := app.Run(os.Args)
if err != nil {
log.Fatalln(err)
}
}