Pasted the implementation from bazilfuse.
parent
89c74b0dc8
commit
695b70b1e6
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package fuseshim
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import (
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"bytes"
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"errors"
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"fmt"
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"os"
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"os/exec"
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"strconv"
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"strings"
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"syscall"
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)
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// OS X appears to cap the size of writes to 1 MiB. This constant is also used
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// for sizing receive buffers, so make it as small as it can be without
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// limiting write sizes.
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const maxWrite = 1 << 20
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var errNoAvail = errors.New("no available fuse devices")
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var errNotLoaded = errors.New("osxfusefs is not loaded")
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func loadOSXFUSE() error {
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cmd := exec.Command("/Library/Filesystems/osxfusefs.fs/Support/load_osxfusefs")
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cmd.Dir = "/"
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cmd.Stdout = os.Stdout
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cmd.Stderr = os.Stderr
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err := cmd.Run()
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return err
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}
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func openOSXFUSEDev() (*os.File, error) {
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var f *os.File
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var err error
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for i := uint64(0); ; i++ {
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path := "/dev/osxfuse" + strconv.FormatUint(i, 10)
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f, err = os.OpenFile(path, os.O_RDWR, 0000)
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if os.IsNotExist(err) {
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if i == 0 {
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// not even the first device was found -> fuse is not loaded
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return nil, errNotLoaded
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}
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// we've run out of kernel-provided devices
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return nil, errNoAvail
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}
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if err2, ok := err.(*os.PathError); ok && err2.Err == syscall.EBUSY {
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// try the next one
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continue
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}
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if err != nil {
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return nil, err
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}
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return f, nil
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}
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}
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func callMount(dir string, conf *mountConfig, f *os.File, ready chan<- struct{}, errp *error) error {
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bin := "/Library/Filesystems/osxfusefs.fs/Support/mount_osxfusefs"
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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 fmt.Errorf("mount options cannot contain commas on darwin: %q=%q", k, v)
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}
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}
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cmd := exec.Command(
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bin,
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"-o", conf.getOptions(),
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// Tell osxfuse-kext how large our buffer is. It must split
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// writes larger than this into multiple writes.
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//
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// OSXFUSE seems to ignore InitResponse.MaxWrite, and uses
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// this instead.
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"-o", "iosize="+strconv.FormatUint(maxWrite, 10),
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// refers to fd passed in cmd.ExtraFiles
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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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cmd.Env = os.Environ()
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cmd.Env = append(cmd.Env, "MOUNT_FUSEFS_CALL_BY_LIB=")
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// TODO this is used for fs typenames etc, let app influence it
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cmd.Env = append(cmd.Env, "MOUNT_FUSEFS_DAEMON_PATH="+bin)
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var buf bytes.Buffer
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cmd.Stdout = &buf
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cmd.Stderr = &buf
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err := cmd.Start()
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if err != nil {
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return err
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}
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go func() {
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err := cmd.Wait()
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if err != nil {
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if buf.Len() > 0 {
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output := buf.Bytes()
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output = bytes.TrimRight(output, "\n")
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msg := err.Error() + ": " + string(output)
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err = errors.New(msg)
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}
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}
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*errp = err
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close(ready)
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}()
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return err
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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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f, err := openOSXFUSEDev()
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if err == errNotLoaded {
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err = loadOSXFUSE()
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if err != nil {
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return nil, err
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}
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// try again
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f, err = openOSXFUSEDev()
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}
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if err != nil {
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return nil, err
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}
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err = callMount(dir, conf, f, ready, errp)
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if err != nil {
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f.Close()
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return nil, err
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}
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return f, nil
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}
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