134 lines
3.2 KiB
Go
134 lines
3.2 KiB
Go
// Copyright 2016 the Go-FUSE Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package fuse
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import (
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"bytes"
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"fmt"
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"os"
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"os/exec"
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"strings"
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"syscall"
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"unsafe"
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)
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func unixgramSocketpair() (l, r *os.File, err error) {
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fd, err := syscall.Socketpair(syscall.AF_UNIX, syscall.SOCK_STREAM, 0)
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if err != nil {
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return nil, nil, os.NewSyscallError("socketpair",
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err.(syscall.Errno))
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}
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l = os.NewFile(uintptr(fd[0]), "socketpair-half1")
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r = os.NewFile(uintptr(fd[1]), "socketpair-half2")
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return
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}
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// Create a FUSE FS on the specified mount point. The returned
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// mount point is always absolute.
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func mount(mountPoint string, opts *MountOptions, ready chan<- error) (fd int, err error) {
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local, remote, err := unixgramSocketpair()
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if err != nil {
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return
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}
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defer local.Close()
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defer remote.Close()
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bin, err := fusermountBinary()
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if err != nil {
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return 0, err
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}
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cmd := exec.Command(bin,
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"-o", strings.Join(opts.optionsStrings(), ","),
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"-o", fmt.Sprintf("iosize=%d", opts.MaxWrite),
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mountPoint)
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cmd.ExtraFiles = []*os.File{remote} // fd would be (index + 3)
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cmd.Env = append(os.Environ(),
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"_FUSE_CALL_BY_LIB=",
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"_FUSE_DAEMON_PATH="+os.Args[0],
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"_FUSE_COMMFD=3",
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"_FUSE_COMMVERS=2",
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"MOUNT_OSXFUSE_CALL_BY_LIB=",
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"MOUNT_OSXFUSE_DAEMON_PATH="+os.Args[0])
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var out, errOut bytes.Buffer
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cmd.Stdout = &out
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cmd.Stderr = &errOut
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if err = cmd.Start(); err != nil {
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return
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}
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fd, err = getConnection(local)
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if err != nil {
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return -1, err
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}
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go func() {
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// wait inside a goroutine or otherwise it would block forever for unknown reasons
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if err := cmd.Wait(); err != nil {
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err = fmt.Errorf("mount_osxfusefs failed: %v. Stderr: %s, Stdout: %s",
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err, errOut.String(), out.String())
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}
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ready <- err
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close(ready)
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}()
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// golang sets CLOEXEC on file descriptors when they are
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// acquired through normal operations (e.g. open).
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// Buf for fd, we have to set CLOEXEC manually
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syscall.CloseOnExec(fd)
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return fd, err
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}
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func unmount(dir string, opts *MountOptions) error {
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return syscall.Unmount(dir, 0)
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}
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func getConnection(local *os.File) (int, error) {
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var data [4]byte
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control := make([]byte, 4*256)
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// n, oobn, recvflags, from, errno - todo: error checking.
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_, oobn, _, _,
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err := syscall.Recvmsg(
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int(local.Fd()), data[:], control[:], 0)
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if err != nil {
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return 0, err
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}
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message := *(*syscall.Cmsghdr)(unsafe.Pointer(&control[0]))
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fd := *(*int32)(unsafe.Pointer(uintptr(unsafe.Pointer(&control[0])) + syscall.SizeofCmsghdr))
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if message.Type != syscall.SCM_RIGHTS {
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return 0, fmt.Errorf("getConnection: recvmsg returned wrong control type: %d", message.Type)
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}
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if oobn <= syscall.SizeofCmsghdr {
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return 0, fmt.Errorf("getConnection: too short control message. Length: %d", oobn)
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}
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if fd < 0 {
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return 0, fmt.Errorf("getConnection: fd < 0: %d", fd)
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}
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return int(fd), nil
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}
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func fusermountBinary() (string, error) {
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binPaths := []string{
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"/Library/Filesystems/macfuse.fs/Contents/Resources/mount_macfuse",
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"/Library/Filesystems/osxfuse.fs/Contents/Resources/mount_osxfuse",
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}
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for _, path := range binPaths {
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if _, err := os.Stat(path); err == nil {
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return path, nil
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}
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}
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return "", fmt.Errorf("no FUSE mount utility found")
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}
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