mirror of
https://github.com/rclone/rclone.git
synced 2024-11-24 05:03:22 +08:00
319 lines
10 KiB
Go
319 lines
10 KiB
Go
// Package cmount implents a FUSE mounting system for rclone remotes.
|
|
//
|
|
// This uses the cgo based cgofuse library
|
|
|
|
// +build cgo
|
|
// +build linux darwin freebsd windows
|
|
|
|
package cmount
|
|
|
|
import (
|
|
"fmt"
|
|
"log"
|
|
"os"
|
|
"os/signal"
|
|
"runtime"
|
|
"syscall"
|
|
"time"
|
|
|
|
"github.com/billziss-gh/cgofuse/fuse"
|
|
"github.com/ncw/rclone/cmd"
|
|
"github.com/ncw/rclone/cmd/mountlib"
|
|
"github.com/ncw/rclone/fs"
|
|
"github.com/pkg/errors"
|
|
"github.com/spf13/cobra"
|
|
)
|
|
|
|
// Globals
|
|
var (
|
|
noModTime = false
|
|
noChecksum = false
|
|
debugFUSE = false
|
|
noSeek = false
|
|
dirCacheTime = 5 * 60 * time.Second
|
|
// mount options
|
|
readOnly = false
|
|
allowNonEmpty = false
|
|
allowRoot = false
|
|
allowOther = false
|
|
defaultPermissions = false
|
|
writebackCache = false
|
|
maxReadAhead fs.SizeSuffix = 128 * 1024
|
|
umask = 0
|
|
uid = ^uint32(0) // these values instruct WinFSP-FUSE to use the current user
|
|
gid = ^uint32(0) // overriden for non windows in mount_unix.go
|
|
// foreground = false
|
|
// default permissions for directories - modified by umask in Mount
|
|
dirPerms = os.FileMode(0777)
|
|
filePerms = os.FileMode(0666)
|
|
extraOptions *[]string
|
|
)
|
|
|
|
func init() {
|
|
cmd.Root.AddCommand(commandDefintion)
|
|
commandDefintion.Flags().BoolVarP(&noModTime, "no-modtime", "", noModTime, "Don't read/write the modification time (can speed things up).")
|
|
commandDefintion.Flags().BoolVarP(&noChecksum, "no-checksum", "", noChecksum, "Don't compare checksums on up/download.")
|
|
commandDefintion.Flags().BoolVarP(&debugFUSE, "debug-fuse", "", debugFUSE, "Debug the FUSE internals - needs -v.")
|
|
commandDefintion.Flags().BoolVarP(&noSeek, "no-seek", "", noSeek, "Don't allow seeking in files.")
|
|
commandDefintion.Flags().DurationVarP(&dirCacheTime, "dir-cache-time", "", dirCacheTime, "Time to cache directory entries for.")
|
|
// mount options
|
|
commandDefintion.Flags().BoolVarP(&readOnly, "read-only", "", readOnly, "Mount read-only.")
|
|
commandDefintion.Flags().BoolVarP(&allowNonEmpty, "allow-non-empty", "", allowNonEmpty, "Allow mounting over a non-empty directory.")
|
|
commandDefintion.Flags().BoolVarP(&allowRoot, "allow-root", "", allowRoot, "Allow access to root user.")
|
|
commandDefintion.Flags().BoolVarP(&allowOther, "allow-other", "", allowOther, "Allow access to other users.")
|
|
commandDefintion.Flags().BoolVarP(&defaultPermissions, "default-permissions", "", defaultPermissions, "Makes kernel enforce access control based on the file mode.")
|
|
commandDefintion.Flags().BoolVarP(&writebackCache, "write-back-cache", "", writebackCache, "Makes kernel buffer writes before sending them to rclone. Without this, writethrough caching is used.")
|
|
commandDefintion.Flags().VarP(&maxReadAhead, "max-read-ahead", "", "The number of bytes that can be prefetched for sequential reads.")
|
|
commandDefintion.Flags().IntVarP(&umask, "umask", "", umask, "Override the permission bits set by the filesystem.")
|
|
extraOptions = commandDefintion.Flags().StringArrayP("option", "o", []string{}, "Option for libfuse/WinFsp. Repeat if required.")
|
|
//commandDefintion.Flags().BoolVarP(&foreground, "foreground", "", foreground, "Do not detach.")
|
|
}
|
|
|
|
var commandDefintion = &cobra.Command{
|
|
Use: commandName + " remote:path /path/to/mountpoint",
|
|
Short: `Mount the remote as a mountpoint. **EXPERIMENTAL**`,
|
|
Long: `
|
|
rclone ` + commandName + ` allows Linux, FreeBSD, macOS and Windows to
|
|
mount any of Rclone's cloud storage systems as a file system with
|
|
FUSE.
|
|
|
|
This is **EXPERIMENTAL** - use with care.
|
|
|
|
First set up your remote using ` + "`rclone config`" + `. Check it works with ` + "`rclone ls`" + ` etc.
|
|
|
|
Start the mount like this
|
|
|
|
rclone ` + commandName + ` remote:path/to/files /path/to/local/mount
|
|
|
|
Or on Windows like this where X: is an unused drive letter
|
|
|
|
rclone ` + commandName + ` remote:path/to/files X:
|
|
|
|
When the program ends, either via Ctrl+C or receiving a SIGINT or SIGTERM signal,
|
|
the mount is automatically stopped.
|
|
|
|
The umount operation can fail, for example when the mountpoint is busy.
|
|
When that happens, it is the user's responsibility to stop the mount manually with
|
|
|
|
# Linux
|
|
fusermount -u /path/to/local/mount
|
|
# OS X
|
|
umount /path/to/local/mount
|
|
|
|
### Limitations ###
|
|
|
|
This can only write files seqentially, it can only seek when reading.
|
|
This means that many applications won't work with their files on an
|
|
rclone mount.
|
|
|
|
The bucket based remotes (eg Swift, S3, Google Compute Storage, B2,
|
|
Hubic) won't work from the root - you will need to specify a bucket,
|
|
or a path within the bucket. So ` + "`swift:`" + ` won't work whereas
|
|
` + "`swift:bucket`" + ` will as will ` + "`swift:bucket/path`" + `.
|
|
None of these support the concept of directories, so empty
|
|
directories will have a tendency to disappear once they fall out of
|
|
the directory cache.
|
|
|
|
Only supported on Linux, FreeBSD, OS X and Windows at the moment.
|
|
|
|
### rclone ` + commandName + ` vs rclone sync/copy ##
|
|
|
|
File systems expect things to be 100% reliable, whereas cloud storage
|
|
systems are a long way from 100% reliable. The rclone sync/copy
|
|
commands cope with this with lots of retries. However rclone ` + commandName + `
|
|
can't use retries in the same way without making local copies of the
|
|
uploads. This might happen in the future, but for the moment rclone
|
|
` + commandName + ` won't do that, so will be less reliable than the rclone command.
|
|
|
|
### Filters ###
|
|
|
|
Note that all the rclone filters can be used to select a subset of the
|
|
files to be visible in the mount.
|
|
|
|
### Directory Cache ###
|
|
|
|
Using the ` + "`--dir-cache-time`" + ` flag, you can set how long a
|
|
directory should be considered up to date and not refreshed from the
|
|
backend. Changes made locally in the mount may appear immediately or
|
|
invalidate the cache. However, changes done on the remote will only
|
|
be picked up once the cache expires.
|
|
|
|
Alternatively, you can send a ` + "`SIGHUP`" + ` signal to rclone for
|
|
it to flush all directory caches, regardless of how old they are.
|
|
Assuming only one rclone instance is running, you can reset the cache
|
|
like this:
|
|
|
|
kill -SIGHUP $(pidof rclone)
|
|
|
|
### Bugs ###
|
|
|
|
* All the remotes should work for read, but some may not for write
|
|
* those which need to know the size in advance won't - eg B2
|
|
* maybe should pass in size as -1 to mean work it out
|
|
* Or put in an an upload cache to cache the files on disk first
|
|
`,
|
|
Run: func(command *cobra.Command, args []string) {
|
|
cmd.CheckArgs(2, 2, command, args)
|
|
fdst := cmd.NewFsDst(args)
|
|
err := Mount(fdst, args[1])
|
|
if err != nil {
|
|
log.Fatalf("Fatal error: %v", err)
|
|
}
|
|
},
|
|
}
|
|
|
|
// mountOptions configures the options from the command line flags
|
|
func mountOptions(device string, mountpoint string) (options []string) {
|
|
// Options
|
|
options = []string{
|
|
"-o", "fsname=" + device,
|
|
"-o", "subtype=rclone",
|
|
"-o", fmt.Sprintf("max_readahead=%d", maxReadAhead),
|
|
}
|
|
if debugFUSE {
|
|
options = append(options, "-o", "debug")
|
|
}
|
|
|
|
// OSX options
|
|
if runtime.GOOS == "darwin" {
|
|
options = append(options, "-o", "volname="+device)
|
|
options = append(options, "-o", "noappledouble")
|
|
options = append(options, "-o", "noapplexattr")
|
|
}
|
|
|
|
// Windows options
|
|
if runtime.GOOS == "windows" {
|
|
// These cause WinFsp to mean the current user
|
|
options = append(options, "-o", "uid=-1")
|
|
options = append(options, "-o", "gid=-1")
|
|
}
|
|
|
|
if allowNonEmpty {
|
|
options = append(options, "-o", "nonempty")
|
|
}
|
|
if allowOther {
|
|
options = append(options, "-o", "allow_other")
|
|
}
|
|
if allowRoot {
|
|
options = append(options, "-o", "allow_root")
|
|
}
|
|
if defaultPermissions {
|
|
options = append(options, "-o", "default_permissions")
|
|
}
|
|
if readOnly {
|
|
options = append(options, "-o", "ro")
|
|
}
|
|
if writebackCache {
|
|
// FIXME? options = append(options, "-o", WritebackCache())
|
|
}
|
|
for _, option := range *extraOptions {
|
|
options = append(options, "-o", option)
|
|
}
|
|
return options
|
|
}
|
|
|
|
// mount the file system
|
|
//
|
|
// The mount point will be ready when this returns.
|
|
//
|
|
// returns an error, and an error channel for the serve process to
|
|
// report an error when fusermount is called.
|
|
func mount(f fs.Fs, mountpoint string) (*mountlib.FS, <-chan error, func() error, error) {
|
|
fs.Debugf(f, "Mounting on %q", mountpoint)
|
|
|
|
// Check the mountpoint
|
|
if runtime.GOOS != "windows" {
|
|
fi, err := os.Stat(mountpoint)
|
|
if err != nil {
|
|
return nil, nil, nil, errors.Wrap(err, "mountpoint")
|
|
}
|
|
if !fi.IsDir() {
|
|
return nil, nil, nil, errors.New("mountpoint is not a directory")
|
|
}
|
|
}
|
|
|
|
// Create underlying FS
|
|
fsys := NewFS(f)
|
|
host := fuse.NewFileSystemHost(fsys)
|
|
|
|
// Create options
|
|
options := mountOptions(f.Name()+":"+f.Root(), mountpoint)
|
|
fs.Debugf(f, "Mounting with options: %q", options)
|
|
|
|
// Serve the mount point in the background returning error to errChan
|
|
errChan := make(chan error, 1)
|
|
go func() {
|
|
var err error
|
|
ok := host.Mount(mountpoint, options)
|
|
if !ok {
|
|
err = errors.New("mount failed")
|
|
fs.Errorf(f, "Mount failed")
|
|
}
|
|
errChan <- err
|
|
}()
|
|
|
|
// unmount
|
|
unmount := func() error {
|
|
fs.Debugf(nil, "Calling host.Unmount")
|
|
if host.Unmount() {
|
|
fs.Debugf(nil, "host.Unmount succeeded")
|
|
return nil
|
|
}
|
|
fs.Debugf(nil, "host.Unmount failed")
|
|
return errors.New("host unmount failed")
|
|
}
|
|
|
|
// Wait for the filesystem to become ready
|
|
<-fsys.ready
|
|
return fsys.FS, errChan, unmount, nil
|
|
}
|
|
|
|
// Mount mounts the remote at mountpoint.
|
|
//
|
|
// If noModTime is set then it
|
|
func Mount(f fs.Fs, mountpoint string) error {
|
|
// Set permissions
|
|
dirPerms = 0777 &^ os.FileMode(umask)
|
|
filePerms = 0666 &^ os.FileMode(umask)
|
|
|
|
// Show stats if the user has specifically requested them
|
|
if cmd.ShowStats() {
|
|
stopStats := cmd.StartStats()
|
|
defer close(stopStats)
|
|
}
|
|
|
|
// Mount it
|
|
FS, errChan, _, err := mount(f, mountpoint)
|
|
if err != nil {
|
|
return errors.Wrap(err, "failed to mount FUSE fs")
|
|
}
|
|
|
|
// Note cgofuse unmounts the fs on SIGINT etc
|
|
|
|
sigHup := make(chan os.Signal, 1)
|
|
signal.Notify(sigHup, syscall.SIGHUP)
|
|
|
|
waitloop:
|
|
for {
|
|
select {
|
|
// umount triggered outside the app
|
|
case err = <-errChan:
|
|
break waitloop
|
|
// user sent SIGHUP to clear the cache
|
|
case <-sigHup:
|
|
root, err := FS.Root()
|
|
if err != nil {
|
|
fs.Errorf(f, "Error reading root: %v", err)
|
|
} else {
|
|
root.ForgetAll()
|
|
}
|
|
}
|
|
}
|
|
|
|
if err != nil {
|
|
return errors.Wrap(err, "failed to umount FUSE fs")
|
|
}
|
|
|
|
return nil
|
|
}
|