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