/usr/share/gocode/src/github.com/hanwen/go-fuse/fuse/mount_linux.go is in golang-github-hanwen-go-fuse-dev 0.0~git20171124.0.14c3015-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 | // Copyright 2016 the Go-FUSE Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package fuse
import (
"bytes"
"fmt"
"os"
"os/exec"
"path"
"strings"
"syscall"
"unsafe"
)
func unixgramSocketpair() (l, r *os.File, err error) {
fd, err := syscall.Socketpair(syscall.AF_UNIX, syscall.SOCK_SEQPACKET, 0)
if err != nil {
return nil, nil, os.NewSyscallError("socketpair",
err.(syscall.Errno))
}
l = os.NewFile(uintptr(fd[0]), "socketpair-half1")
r = os.NewFile(uintptr(fd[1]), "socketpair-half2")
return
}
// Create a FUSE FS on the specified mount point. The returned
// mount point is always absolute.
func mount(mountPoint string, opts *MountOptions, ready chan<- error) (fd int, err error) {
local, remote, err := unixgramSocketpair()
if err != nil {
return
}
defer local.Close()
defer remote.Close()
bin, err := fusermountBinary()
if err != nil {
return 0, err
}
cmd := []string{bin, mountPoint}
if s := opts.optionsStrings(); len(s) > 0 {
cmd = append(cmd, "-o", strings.Join(s, ","))
}
proc, err := os.StartProcess(bin,
cmd,
&os.ProcAttr{
Env: []string{"_FUSE_COMMFD=3"},
Files: []*os.File{os.Stdin, os.Stdout, os.Stderr, remote}})
if err != nil {
return
}
w, err := proc.Wait()
if err != nil {
return
}
if !w.Success() {
err = fmt.Errorf("fusermount exited with code %v\n", w.Sys())
return
}
fd, err = getConnection(local)
if err != nil {
return -1, err
}
// golang sets CLOEXEC on file descriptors when they are
// acquired through normal operations (e.g. open).
// Buf for fd, we have to set CLOEXEC manually
syscall.CloseOnExec(fd)
close(ready)
return fd, err
}
func unmount(mountPoint string) (err error) {
if os.Geteuid() == 0 {
return syscall.Unmount(mountPoint, 0)
}
bin, err := fusermountBinary()
if err != nil {
return err
}
errBuf := bytes.Buffer{}
cmd := exec.Command(bin, "-u", mountPoint)
cmd.Stderr = &errBuf
err = cmd.Run()
if errBuf.Len() > 0 {
return fmt.Errorf("%s (code %v)\n",
errBuf.String(), err)
}
return err
}
func getConnection(local *os.File) (int, error) {
var data [4]byte
control := make([]byte, 4*256)
// n, oobn, recvflags, from, errno - todo: error checking.
_, oobn, _, _,
err := syscall.Recvmsg(
int(local.Fd()), data[:], control[:], 0)
if err != nil {
return 0, err
}
message := *(*syscall.Cmsghdr)(unsafe.Pointer(&control[0]))
fd := *(*int32)(unsafe.Pointer(uintptr(unsafe.Pointer(&control[0])) + syscall.SizeofCmsghdr))
if message.Type != 1 {
return 0, fmt.Errorf("getConnection: recvmsg returned wrong control type: %d", message.Type)
}
if oobn <= syscall.SizeofCmsghdr {
return 0, fmt.Errorf("getConnection: too short control message. Length: %d", oobn)
}
if fd < 0 {
return 0, fmt.Errorf("getConnection: fd < 0: %d", fd)
}
return int(fd), nil
}
// lookPathFallback - search binary in PATH and, if that fails,
// in fallbackDir. This is useful if PATH is possible empty.
func lookPathFallback(file string, fallbackDir string) (string, error) {
binPath, err := exec.LookPath(file)
if err == nil {
return binPath, nil
}
abs := path.Join(fallbackDir, file)
return exec.LookPath(abs)
}
func fusermountBinary() (string, error) {
return lookPathFallback("fusermount", "/bin")
}
func umountBinary() (string, error) {
return lookPathFallback("umount", "/bin")
}
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