1 files changed, 147 insertions, 0 deletions
diff --git a/vendor/github.com/containerd/errdefs/resolve.go b/vendor/github.com/containerd/errdefs/resolve.go
new file mode 100644
index 0000000..c02d4a7
--- /dev/null
+++ b/vendor/github.com/containerd/errdefs/resolve.go
@@ -0,0 +1,147 @@
+/*
+   Copyright The containerd 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.
+*/
+
+package errdefs
+
+import "context"
+
+// Resolve returns the first error found in the error chain which matches an
+// error defined in this package or context error. A raw, unwrapped error is
+// returned or ErrUnknown if no matching error is found.
+//
+// This is useful for determining a response code based on the outermost wrapped
+// error rather than the original cause. For example, a not found error deep
+// in the code may be wrapped as an invalid argument. When determining status
+// code from Is* functions, the depth or ordering of the error is not
+// considered.
+//
+// The search order is depth first, a wrapped error returned from any part of
+// the chain from `Unwrap() error` will be returned before any joined errors
+// as returned by `Unwrap() []error`.
+func Resolve(err error) error {
+	if err == nil {
+		return nil
+	}
+	err = firstError(err)
+	if err == nil {
+		err = ErrUnknown
+	}
+	return err
+}
+
+func firstError(err error) error {
+	for {
+		switch err {
+		case ErrUnknown,
+			ErrInvalidArgument,
+			ErrNotFound,
+			ErrAlreadyExists,
+			ErrPermissionDenied,
+			ErrResourceExhausted,
+			ErrFailedPrecondition,
+			ErrConflict,
+			ErrNotModified,
+			ErrAborted,
+			ErrOutOfRange,
+			ErrNotImplemented,
+			ErrInternal,
+			ErrUnavailable,
+			ErrDataLoss,
+			ErrUnauthenticated,
+			context.DeadlineExceeded,
+			context.Canceled:
+			return err
+		}
+		switch e := err.(type) {
+		case customMessage:
+			err = e.err
+		case unknown:
+			return ErrUnknown
+		case invalidParameter:
+			return ErrInvalidArgument
+		case notFound:
+			return ErrNotFound
+		case alreadyExists:
+			return ErrAlreadyExists
+		case forbidden:
+			return ErrPermissionDenied
+		case resourceExhausted:
+			return ErrResourceExhausted
+		case failedPrecondition:
+			return ErrFailedPrecondition
+		case conflict:
+			return ErrConflict
+		case notModified:
+			return ErrNotModified
+		case aborted:
+			return ErrAborted
+		case errOutOfRange:
+			return ErrOutOfRange
+		case notImplemented:
+			return ErrNotImplemented
+		case system:
+			return ErrInternal
+		case unavailable:
+			return ErrUnavailable
+		case dataLoss:
+			return ErrDataLoss
+		case unauthorized:
+			return ErrUnauthenticated
+		case deadlineExceeded:
+			return context.DeadlineExceeded
+		case cancelled:
+			return context.Canceled
+		case interface{ Unwrap() error }:
+			err = e.Unwrap()
+			if err == nil {
+				return nil
+			}
+		case interface{ Unwrap() []error }:
+			for _, ue := range e.Unwrap() {
+				if fe := firstError(ue); fe != nil {
+					return fe
+				}
+			}
+			return nil
+		case interface{ Is(error) bool }:
+			for _, target := range []error{ErrUnknown,
+				ErrInvalidArgument,
+				ErrNotFound,
+				ErrAlreadyExists,
+				ErrPermissionDenied,
+				ErrResourceExhausted,
+				ErrFailedPrecondition,
+				ErrConflict,
+				ErrNotModified,
+				ErrAborted,
+				ErrOutOfRange,
+				ErrNotImplemented,
+				ErrInternal,
+				ErrUnavailable,
+				ErrDataLoss,
+				ErrUnauthenticated,
+				context.DeadlineExceeded,
+				context.Canceled} {
+				if e.Is(target) {
+					return target
+				}
+			}
+			return nil
+		default:
+			return nil
+		}
+	}
+}