mirror of
https://github.com/hanzoai/go-fuse.git
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Han-Wen Nienhuys
cfa748f586
On macos, "Full Disk Access" privilege determines access to the mountpoint, and apparently it's possible to deny the FUSE server access to its own mount point. Pretend pollhack was successful, because we can't deadlock ourselves in that case anyway. Addresses https://github.com/hanwen/go-fuse/issues/572 Change-Id: Id00000003675a5f91e4243607ba93fbc4a09dc53
57 lines
1.2 KiB
Go
57 lines
1.2 KiB
Go
package fuse
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import (
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"path/filepath"
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"syscall"
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"unsafe"
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)
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type pollFd struct {
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Fd int32
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Events int16
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Revents int16
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}
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func sysPoll(fds []pollFd, timeout int) (n int, err error) {
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r0, _, e1 := syscall.Syscall(syscall.SYS_POLL, uintptr(unsafe.Pointer(&fds[0])),
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uintptr(len(fds)), uintptr(timeout))
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n = int(r0)
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if e1 != 0 {
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err = syscall.Errno(e1)
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}
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return n, err
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}
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func pollHack(mountPoint string) error {
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const (
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POLLIN = 0x1
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POLLPRI = 0x2
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POLLOUT = 0x4
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POLLRDHUP = 0x2000
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POLLERR = 0x8
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POLLHUP = 0x10
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)
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fd, err := syscall.Open(filepath.Join(mountPoint, pollHackName), syscall.O_RDONLY, 0)
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if err == syscall.EPERM {
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// This can happen due to macos sandboxing, see
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// https://github.com/hanwen/go-fuse/issues/572#issuecomment-2904052441
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// If we don't have access to access our own mount
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// point, we also can't deadlock ourselves with poll, so this is fine.
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return nil
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}
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if err != nil {
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return err
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}
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pollData := []pollFd{{
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Fd: int32(fd),
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Events: POLLIN | POLLPRI | POLLOUT,
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}}
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// Trigger _OP_POLL, so we can say ENOSYS. We don't care about
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// the return value.
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sysPoll(pollData, 0)
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syscall.Close(fd)
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return nil
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}
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