mirror of
https://github.com/rclone/rclone
synced 2024-12-23 14:23:44 +01:00
324 lines
10 KiB
Go
324 lines
10 KiB
Go
// Package cmount implents a FUSE mounting system for rclone remotes.
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//
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// This uses the cgo based cgofuse library
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// +build cgo
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// +build linux darwin freebsd windows
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package cmount
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import (
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"fmt"
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"log"
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"os"
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"os/signal"
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"runtime"
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"syscall"
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"time"
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"github.com/billziss-gh/cgofuse/fuse"
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"github.com/ncw/rclone/cmd"
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"github.com/ncw/rclone/cmd/mountlib"
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"github.com/ncw/rclone/fs"
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"github.com/pkg/errors"
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"github.com/spf13/cobra"
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)
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// Globals
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var (
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noModTime = false
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noChecksum = false
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debugFUSE = false
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noSeek = false
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dirCacheTime = 5 * 60 * time.Second
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// mount options
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readOnly = false
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allowNonEmpty = false
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allowRoot = false
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allowOther = false
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defaultPermissions = false
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writebackCache = false
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maxReadAhead fs.SizeSuffix = 128 * 1024
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umask = 0
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uid = ^uint32(0) // these values instruct WinFSP-FUSE to use the current user
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gid = ^uint32(0) // overriden for non windows in mount_unix.go
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// foreground = false
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// default permissions for directories - modified by umask in Mount
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dirPerms = os.FileMode(0777)
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filePerms = os.FileMode(0666)
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extraOptions *[]string
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extraFlags *[]string
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)
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func init() {
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cmd.Root.AddCommand(commandDefintion)
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commandDefintion.Flags().BoolVarP(&noModTime, "no-modtime", "", noModTime, "Don't read/write the modification time (can speed things up).")
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commandDefintion.Flags().BoolVarP(&noChecksum, "no-checksum", "", noChecksum, "Don't compare checksums on up/download.")
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commandDefintion.Flags().BoolVarP(&debugFUSE, "debug-fuse", "", debugFUSE, "Debug the FUSE internals - needs -v.")
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commandDefintion.Flags().BoolVarP(&noSeek, "no-seek", "", noSeek, "Don't allow seeking in files.")
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commandDefintion.Flags().DurationVarP(&dirCacheTime, "dir-cache-time", "", dirCacheTime, "Time to cache directory entries for.")
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// mount options
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commandDefintion.Flags().BoolVarP(&readOnly, "read-only", "", readOnly, "Mount read-only.")
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commandDefintion.Flags().BoolVarP(&allowNonEmpty, "allow-non-empty", "", allowNonEmpty, "Allow mounting over a non-empty directory.")
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commandDefintion.Flags().BoolVarP(&allowRoot, "allow-root", "", allowRoot, "Allow access to root user.")
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commandDefintion.Flags().BoolVarP(&allowOther, "allow-other", "", allowOther, "Allow access to other users.")
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commandDefintion.Flags().BoolVarP(&defaultPermissions, "default-permissions", "", defaultPermissions, "Makes kernel enforce access control based on the file mode.")
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commandDefintion.Flags().BoolVarP(&writebackCache, "write-back-cache", "", writebackCache, "Makes kernel buffer writes before sending them to rclone. Without this, writethrough caching is used.")
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commandDefintion.Flags().VarP(&maxReadAhead, "max-read-ahead", "", "The number of bytes that can be prefetched for sequential reads.")
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commandDefintion.Flags().IntVarP(&umask, "umask", "", umask, "Override the permission bits set by the filesystem.")
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extraOptions = commandDefintion.Flags().StringArrayP("option", "o", []string{}, "Option for libfuse/WinFsp. Repeat if required.")
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extraFlags = commandDefintion.Flags().StringArrayP("fuse-flag", "", []string{}, "Flags or arguments to be passed direct to libfuse/WinFsp. Repeat if required.")
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//commandDefintion.Flags().BoolVarP(&foreground, "foreground", "", foreground, "Do not detach.")
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}
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var commandDefintion = &cobra.Command{
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Use: commandName + " remote:path /path/to/mountpoint",
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Short: `Mount the remote as a mountpoint. **EXPERIMENTAL**`,
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Long: `
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rclone ` + commandName + ` allows Linux, FreeBSD, macOS and Windows to
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mount any of Rclone's cloud storage systems as a file system with
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FUSE.
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This is **EXPERIMENTAL** - use with care.
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First set up your remote using ` + "`rclone config`" + `. Check it works with ` + "`rclone ls`" + ` etc.
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Start the mount like this
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rclone ` + commandName + ` remote:path/to/files /path/to/local/mount
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Or on Windows like this where X: is an unused drive letter
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rclone ` + commandName + ` remote:path/to/files X:
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When the program ends, either via Ctrl+C or receiving a SIGINT or SIGTERM signal,
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the mount is automatically stopped.
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The umount operation can fail, for example when the mountpoint is busy.
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When that happens, it is the user's responsibility to stop the mount manually with
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# Linux
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fusermount -u /path/to/local/mount
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# OS X
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umount /path/to/local/mount
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### Limitations ###
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This can only write files seqentially, it can only seek when reading.
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This means that many applications won't work with their files on an
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rclone mount.
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The bucket based remotes (eg Swift, S3, Google Compute Storage, B2,
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Hubic) won't work from the root - you will need to specify a bucket,
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or a path within the bucket. So ` + "`swift:`" + ` won't work whereas
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` + "`swift:bucket`" + ` will as will ` + "`swift:bucket/path`" + `.
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None of these support the concept of directories, so empty
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directories will have a tendency to disappear once they fall out of
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the directory cache.
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Only supported on Linux, FreeBSD, OS X and Windows at the moment.
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### rclone ` + commandName + ` vs rclone sync/copy ##
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File systems expect things to be 100% reliable, whereas cloud storage
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systems are a long way from 100% reliable. The rclone sync/copy
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commands cope with this with lots of retries. However rclone ` + commandName + `
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can't use retries in the same way without making local copies of the
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uploads. This might happen in the future, but for the moment rclone
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` + commandName + ` won't do that, so will be less reliable than the rclone command.
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### Filters ###
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Note that all the rclone filters can be used to select a subset of the
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files to be visible in the mount.
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### Directory Cache ###
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Using the ` + "`--dir-cache-time`" + ` flag, you can set how long a
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directory should be considered up to date and not refreshed from the
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backend. Changes made locally in the mount may appear immediately or
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invalidate the cache. However, changes done on the remote will only
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be picked up once the cache expires.
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Alternatively, you can send a ` + "`SIGHUP`" + ` signal to rclone for
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it to flush all directory caches, regardless of how old they are.
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Assuming only one rclone instance is running, you can reset the cache
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like this:
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kill -SIGHUP $(pidof rclone)
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### Bugs ###
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* All the remotes should work for read, but some may not for write
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* those which need to know the size in advance won't - eg B2
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* maybe should pass in size as -1 to mean work it out
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* Or put in an an upload cache to cache the files on disk first
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`,
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Run: func(command *cobra.Command, args []string) {
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cmd.CheckArgs(2, 2, command, args)
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fdst := cmd.NewFsDst(args)
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err := Mount(fdst, args[1])
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if err != nil {
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log.Fatalf("Fatal error: %v", err)
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}
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},
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}
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// mountOptions configures the options from the command line flags
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func mountOptions(device string, mountpoint string) (options []string) {
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// Options
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options = []string{
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"-o", "fsname=" + device,
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"-o", "subtype=rclone",
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"-o", fmt.Sprintf("max_readahead=%d", maxReadAhead),
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}
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if debugFUSE {
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options = append(options, "-o", "debug")
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}
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// OSX options
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if runtime.GOOS == "darwin" {
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options = append(options, "-o", "volname="+device)
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options = append(options, "-o", "noappledouble")
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options = append(options, "-o", "noapplexattr")
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}
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// Windows options
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if runtime.GOOS == "windows" {
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// These cause WinFsp to mean the current user
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options = append(options, "-o", "uid=-1")
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options = append(options, "-o", "gid=-1")
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}
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if allowNonEmpty {
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options = append(options, "-o", "nonempty")
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}
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if allowOther {
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options = append(options, "-o", "allow_other")
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}
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if allowRoot {
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options = append(options, "-o", "allow_root")
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}
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if defaultPermissions {
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options = append(options, "-o", "default_permissions")
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}
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if readOnly {
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options = append(options, "-o", "ro")
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}
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if writebackCache {
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// FIXME? options = append(options, "-o", WritebackCache())
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}
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for _, option := range *extraOptions {
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options = append(options, "-o", option)
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}
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for _, option := range *extraFlags {
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options = append(options, option)
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}
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return options
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}
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// mount the file system
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//
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// The mount point will be ready when this returns.
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//
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// returns an error, and an error channel for the serve process to
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// report an error when fusermount is called.
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func mount(f fs.Fs, mountpoint string) (*mountlib.FS, <-chan error, func() error, error) {
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fs.Debugf(f, "Mounting on %q", mountpoint)
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// Check the mountpoint
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if runtime.GOOS != "windows" {
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fi, err := os.Stat(mountpoint)
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if err != nil {
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return nil, nil, nil, errors.Wrap(err, "mountpoint")
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}
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if !fi.IsDir() {
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return nil, nil, nil, errors.New("mountpoint is not a directory")
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}
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}
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// Create underlying FS
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fsys := NewFS(f)
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host := fuse.NewFileSystemHost(fsys)
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// Create options
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options := mountOptions(f.Name()+":"+f.Root(), mountpoint)
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fs.Debugf(f, "Mounting with options: %q", options)
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// Serve the mount point in the background returning error to errChan
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errChan := make(chan error, 1)
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go func() {
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var err error
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ok := host.Mount(mountpoint, options)
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if !ok {
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err = errors.New("mount failed")
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fs.Errorf(f, "Mount failed")
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}
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errChan <- err
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}()
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// unmount
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unmount := func() error {
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fs.Debugf(nil, "Calling host.Unmount")
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if host.Unmount() {
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fs.Debugf(nil, "host.Unmount succeeded")
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return nil
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}
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fs.Debugf(nil, "host.Unmount failed")
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return errors.New("host unmount failed")
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}
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// Wait for the filesystem to become ready
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<-fsys.ready
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return fsys.FS, errChan, unmount, nil
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}
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// Mount mounts the remote at mountpoint.
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//
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// If noModTime is set then it
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func Mount(f fs.Fs, mountpoint string) error {
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// Set permissions
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dirPerms = 0777 &^ os.FileMode(umask)
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filePerms = 0666 &^ os.FileMode(umask)
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// Show stats if the user has specifically requested them
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if cmd.ShowStats() {
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stopStats := cmd.StartStats()
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defer close(stopStats)
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}
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// Mount it
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FS, errChan, _, err := mount(f, mountpoint)
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if err != nil {
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return errors.Wrap(err, "failed to mount FUSE fs")
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}
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// Note cgofuse unmounts the fs on SIGINT etc
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sigHup := make(chan os.Signal, 1)
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signal.Notify(sigHup, syscall.SIGHUP)
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waitloop:
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for {
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select {
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// umount triggered outside the app
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case err = <-errChan:
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break waitloop
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// user sent SIGHUP to clear the cache
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case <-sigHup:
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root, err := FS.Root()
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if err != nil {
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fs.Errorf(f, "Error reading root: %v", err)
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} else {
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root.ForgetAll()
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}
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}
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}
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if err != nil {
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return errors.Wrap(err, "failed to umount FUSE fs")
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}
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return nil
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}
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