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/*
* errors.go - Custom errors and error functions used by fscrypt
*
* Copyright 2017 Google Inc.
* Author: Joe Richey (joerichey@google.com)
*
* 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 util
import (
"fmt"
"log"
"os"
)
// InvalidInputF creates an error that should indicate either bad input from a
// caller of a public library function or bad user input.
func InvalidInputF(format string, a ...interface{}) error {
return fmt.Errorf("invalid input: "+format, a...)
}
// InvalidLengthError indicates name should have had length expected.
func InvalidLengthError(name string, expected int, actual int) error {
return InvalidInputF("expected %s of length %d, actual length was %d", name, expected, actual)
}
// SystemErrorF creates an error that should indicate something has gone wrong
// in the underlying system (syscall failure, bad ioctl, etc...).
func SystemErrorF(format string, a ...interface{}) error {
return fmt.Errorf("system error: "+format, a...)
}
// NeverError panics if a non-nil error is passed in. It should be used to check
// for logic errors, not to handle recoverable errors.
func NeverError(err error) {
if err != nil {
log.Panicf("NeverError() check failed: %v", err)
}
}
// UnderlyingError returns the underlying error for known os error types.
// From: src/os/error.go
func UnderlyingError(err error) error {
switch err := err.(type) {
case *os.PathError:
return err.Err
case *os.LinkError:
return err.Err
case *os.SyscallError:
return err.Err
}
return err
}
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