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author | Zahoor Mohamed <zahoor@zahoor.in> | 2017-03-23 21:56:06 +0800 |
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committer | Felix Lange <fjl@users.noreply.github.com> | 2017-03-23 21:56:06 +0800 |
commit | 11e7a712f469fb24ddb88ecebcefab6ed8880eb8 (patch) | |
tree | c052776c80475767eb7a038bef99ff784b071ef7 /vendor/bazil.org/fuse/mount_freebsd.go | |
parent | 61d2150a0750a554250c3bf090ef994be6c060f0 (diff) | |
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swarm/api: support mounting manifests via FUSE (#3690)
Diffstat (limited to 'vendor/bazil.org/fuse/mount_freebsd.go')
-rw-r--r-- | vendor/bazil.org/fuse/mount_freebsd.go | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/vendor/bazil.org/fuse/mount_freebsd.go b/vendor/bazil.org/fuse/mount_freebsd.go new file mode 100644 index 000000000..70bb41024 --- /dev/null +++ b/vendor/bazil.org/fuse/mount_freebsd.go @@ -0,0 +1,111 @@ +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 +} |