c9e4e4f741
Unlike the FUSE implementation on Linux, macFUSE doesn't cache the file
attributes from the `LOOKUP` call, so it calls `GETATTR` prior to
accessing a file.
In the case of the `VirtualConfNode` (reverse config file passthrough),
this resulted in the default `GETATTR` implementation returning an empty
result, ultimately resulting in a "permission denied" error.
14:44:14.095207 rx 3: GETATTR n2
14:44:14.095229 tx 3: OK, {tA=1s {M0100000 SZ=0 L=0 0:0 0 0:8954996 A 0.000000 M 0.000000 C 0.000000}}
14:44:14.099943 rx 4: ACCESS n2 {u=501 g=20 r}
14:44:14.099990 tx 4: 13=permission denied
By impementing `Getattr` (from `fs.NodeGetattrer`) on `VirtualConfNode`
this solves the issue.
68 lines
1.4 KiB
Go
68 lines
1.4 KiB
Go
package fusefrontend_reverse
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import (
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"context"
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"sync"
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"syscall"
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"github.com/hanwen/go-fuse/v2/fs"
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"github.com/hanwen/go-fuse/v2/fuse"
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)
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var _ = (fs.NodeOpener)((*VirtualConfNode)(nil))
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var _ = (fs.NodeGetattrer)((*VirtualConfNode)(nil))
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type VirtualConfNode struct {
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fs.Inode
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path string
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}
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func (n *VirtualConfNode) Open(ctx context.Context, flags uint32) (fh fs.FileHandle, fuseFlags uint32, errno syscall.Errno) {
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fd, err := syscall.Open(n.path, syscall.O_RDONLY, 0)
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if err != nil {
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errno = fs.ToErrno(err)
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return
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}
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fh = &VirtualConfFile{fd: fd}
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return
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}
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func (n *VirtualConfNode) Getattr(ctx context.Context, fh fs.FileHandle, out *fuse.AttrOut) syscall.Errno {
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var st syscall.Stat_t
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err := syscall.Stat(n.path, &st)
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if err != nil {
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return fs.ToErrno(err)
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}
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out.FromStat(&st)
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return 0
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}
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// Check that we have implemented the fs.File* interfaces
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var _ = (fs.FileReader)((*VirtualConfFile)(nil))
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var _ = (fs.FileReleaser)((*VirtualConfFile)(nil))
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type VirtualConfFile struct {
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mu sync.Mutex
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fd int
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}
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func (f *VirtualConfFile) Read(ctx context.Context, buf []byte, off int64) (res fuse.ReadResult, errno syscall.Errno) {
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f.mu.Lock()
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defer f.mu.Unlock()
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res = fuse.ReadResultFd(uintptr(f.fd), off, len(buf))
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return
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}
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func (f *VirtualConfFile) Release(ctx context.Context) syscall.Errno {
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f.mu.Lock()
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defer f.mu.Unlock()
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if f.fd != -1 {
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err := syscall.Close(f.fd)
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f.fd = -1
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return fs.ToErrno(err)
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}
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return syscall.EBADF
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}
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