mirror of https://github.com/perkeep/perkeep.git
68 lines
1.8 KiB
Go
68 lines
1.8 KiB
Go
// Copyright 2012 The Go 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 (
|
|
"fmt"
|
|
"net"
|
|
"os"
|
|
"os/exec"
|
|
"syscall"
|
|
)
|
|
|
|
func mount(dir string) (fusefd int, errmsg string) {
|
|
fds, err := syscall.Socketpair(syscall.AF_FILE, syscall.SOCK_STREAM, 0)
|
|
if err != nil {
|
|
return -1, fmt.Sprintf("socketpair error: %v", err)
|
|
}
|
|
defer syscall.Close(fds[0])
|
|
defer syscall.Close(fds[1])
|
|
|
|
cmd := exec.Command("/bin/fusermount", "--", dir)
|
|
cmd.Env = append(os.Environ(), "_FUSE_COMMFD=3")
|
|
|
|
writeFile := os.NewFile(uintptr(fds[0]), "fusermount-child-writes")
|
|
defer writeFile.Close()
|
|
cmd.ExtraFiles = []*os.File{writeFile}
|
|
|
|
out, err := cmd.CombinedOutput()
|
|
if len(out) > 0 || err != nil {
|
|
return -1, fmt.Sprintf("fusermount: %q, %v", out, err)
|
|
}
|
|
|
|
readFile := os.NewFile(uintptr(fds[1]), "fusermount-parent-reads")
|
|
defer readFile.Close()
|
|
c, err := net.FileConn(readFile)
|
|
if err != nil {
|
|
return -1, fmt.Sprintf("FileConn from fusermount socket: %v", err)
|
|
}
|
|
defer c.Close()
|
|
|
|
uc, ok := c.(*net.UnixConn)
|
|
if !ok {
|
|
return -1, fmt.Sprintf("unexpected FileConn type; expected UnixConn, got %T", c)
|
|
}
|
|
|
|
buf := make([]byte, 32) // expect 1 byte
|
|
oob := make([]byte, 32) // expect 24 bytes
|
|
_, oobn, _, _, err := uc.ReadMsgUnix(buf, oob)
|
|
scms, err := syscall.ParseSocketControlMessage(oob[:oobn])
|
|
if err != nil {
|
|
return -1, fmt.Sprintf("ParseSocketControlMessage: %v", err)
|
|
}
|
|
if len(scms) != 1 {
|
|
return -1, fmt.Sprintf("expected 1 SocketControlMessage; got scms = %#v", scms)
|
|
}
|
|
scm := scms[0]
|
|
gotFds, err := syscall.ParseUnixRights(&scm)
|
|
if err != nil {
|
|
return -1, fmt.Sprintf("syscall.ParseUnixRights: %v", err)
|
|
}
|
|
if len(gotFds) != 1 {
|
|
return -1, fmt.Sprintf("wanted 1 fd; got %#v", gotFds)
|
|
}
|
|
return gotFds[0], ""
|
|
}
|