[WIP] Initial commit

vendor/github.com/cockroachdb/errors/errbase/adapters_errno.go

@@ -0,0 +1,66 @@
+// Copyright 2019 The Cockroach Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+// implied. See the License for the specific language governing
+// permissions and limitations under the License.
+
+// +build !plan9
+
+package errbase
+
+import (
+	"context"
+	"os"
+	"runtime"
+	"syscall"
+
+	"github.com/cockroachdb/errors/errorspb"
+	"github.com/gogo/protobuf/proto"
+)
+
+const thisArch = runtime.GOOS + ":" + runtime.GOARCH
+
+func encodeErrno(_ context.Context, err error) (msg string, safe []string, payload proto.Message) {
+	e := err.(syscall.Errno)
+	payload = &errorspb.ErrnoPayload{
+		OrigErrno:    int64(e),
+		Arch:         thisArch,
+		IsPermission: e.Is(os.ErrPermission),
+		IsExist:      e.Is(os.ErrExist),
+		IsNotExist:   e.Is(os.ErrNotExist),
+		IsTimeout:    e.Timeout(),
+		IsTemporary:  e.Temporary(),
+	}
+	return e.Error(), []string{e.Error()}, payload
+}
+
+func decodeErrno(_ context.Context, msg string, _ []string, payload proto.Message) error {
+	m, ok := payload.(*errorspb.ErrnoPayload)
+	if !ok {
+		// If this ever happens, this means some version of the library
+		// (presumably future) changed the payload type, and we're
+		// receiving this here. In this case, give up and let
+		// DecodeError use the opaque type.
+		return nil
+	}
+	if m.Arch != thisArch {
+		// The errno object is coming from a different platform. We'll
+		// keep it opaque here.
+		return &OpaqueErrno{msg: msg, details: m}
+	}
+	return syscall.Errno(m.OrigErrno)
+}
+
+func init() {
+	pKey := GetTypeKey(syscall.Errno(0))
+	RegisterLeafEncoder(pKey, encodeErrno)
+	RegisterLeafDecoder(pKey, decodeErrno)
+}