mirror of https://github.com/restic/restic.git
112 lines
2.8 KiB
Go
112 lines
2.8 KiB
Go
package fuse
|
|
|
|
import (
|
|
"fmt"
|
|
"log"
|
|
"os"
|
|
"os/exec"
|
|
"strings"
|
|
"sync"
|
|
"syscall"
|
|
)
|
|
|
|
func handleMountFusefsStderr(errCh chan<- error) func(line string) (ignore bool) {
|
|
return func(line string) (ignore bool) {
|
|
const (
|
|
noMountpointPrefix = `mount_fusefs: `
|
|
noMountpointSuffix = `: No such file or directory`
|
|
)
|
|
if strings.HasPrefix(line, noMountpointPrefix) && strings.HasSuffix(line, noMountpointSuffix) {
|
|
// re-extract it from the error message in case some layer
|
|
// changed the path
|
|
mountpoint := line[len(noMountpointPrefix) : len(line)-len(noMountpointSuffix)]
|
|
err := &MountpointDoesNotExistError{
|
|
Path: mountpoint,
|
|
}
|
|
select {
|
|
case errCh <- err:
|
|
return true
|
|
default:
|
|
// not the first error; fall back to logging it
|
|
return false
|
|
}
|
|
}
|
|
|
|
return false
|
|
}
|
|
}
|
|
|
|
// isBoringMountFusefsError returns whether the Wait error is
|
|
// uninteresting; exit status 1 is.
|
|
func isBoringMountFusefsError(err error) bool {
|
|
if err, ok := err.(*exec.ExitError); ok && err.Exited() {
|
|
if status, ok := err.Sys().(syscall.WaitStatus); ok && status.ExitStatus() == 1 {
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
func mount(dir string, conf *mountConfig, ready chan<- struct{}, errp *error) (*os.File, error) {
|
|
for k, v := range conf.options {
|
|
if strings.Contains(k, ",") || strings.Contains(v, ",") {
|
|
// Silly limitation but the mount helper does not
|
|
// understand any escaping. See TestMountOptionCommaError.
|
|
return nil, fmt.Errorf("mount options cannot contain commas on FreeBSD: %q=%q", k, v)
|
|
}
|
|
}
|
|
|
|
f, err := os.OpenFile("/dev/fuse", os.O_RDWR, 0000)
|
|
if err != nil {
|
|
*errp = err
|
|
return nil, err
|
|
}
|
|
|
|
cmd := exec.Command(
|
|
"/sbin/mount_fusefs",
|
|
"--safe",
|
|
"-o", conf.getOptions(),
|
|
"3",
|
|
dir,
|
|
)
|
|
cmd.ExtraFiles = []*os.File{f}
|
|
|
|
stdout, err := cmd.StdoutPipe()
|
|
if err != nil {
|
|
return nil, fmt.Errorf("setting up mount_fusefs stderr: %v", err)
|
|
}
|
|
stderr, err := cmd.StderrPipe()
|
|
if err != nil {
|
|
return nil, fmt.Errorf("setting up mount_fusefs stderr: %v", err)
|
|
}
|
|
|
|
if err := cmd.Start(); err != nil {
|
|
return nil, fmt.Errorf("mount_fusefs: %v", err)
|
|
}
|
|
helperErrCh := make(chan error, 1)
|
|
var wg sync.WaitGroup
|
|
wg.Add(2)
|
|
go lineLogger(&wg, "mount helper output", neverIgnoreLine, stdout)
|
|
go lineLogger(&wg, "mount helper error", handleMountFusefsStderr(helperErrCh), stderr)
|
|
wg.Wait()
|
|
if err := cmd.Wait(); err != nil {
|
|
// see if we have a better error to report
|
|
select {
|
|
case helperErr := <-helperErrCh:
|
|
// log the Wait error if it's not what we expected
|
|
if !isBoringMountFusefsError(err) {
|
|
log.Printf("mount helper failed: %v", err)
|
|
}
|
|
// and now return what we grabbed from stderr as the real
|
|
// error
|
|
return nil, helperErr
|
|
default:
|
|
// nope, fall back to generic message
|
|
}
|
|
return nil, fmt.Errorf("mount_fusefs: %v", err)
|
|
}
|
|
|
|
close(ready)
|
|
return f, nil
|
|
}
|