Crypt Keeper 319d6cca62 fs: adds base UnimplementedFS type and unwraps PathError (#1046) ...

This reduces some boilerplate by extracting UnimplementedFS from the
existing FS implementations, such that it returns ENOSYS. This also
removes inconsistency where some methods on FS returned syscall.Errno
and others PathError.

Note: this doesn't get rid of all PathError, yet. We still need to
create a syscallfs.File type which would be able to do that. This is
just one preliminary cleanup before refactoring out the `fs.FS`
embedding from `syscallfs.DS`.

P.S. naming convention is arbitrary, so I took UnimplementedXXX from
grpc. This pattern is used a lot of places, also proxy-wasm-go-sdk, e.g.
`DefaultVMContext`.

Signed-off-by: Adrian Cole <adrian@tetrate.io>

2023-01-18 09:37:12 -06:00

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