/*
 * errors.go - Common errors and error handling
 *
 * 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 cmd

import (
	"github.com/pkg/errors"

	"github.com/google/fscrypt/util"
)

// Common errors used across commands
var (
	ErrUnknownVersion = errors.New("unknown (missing version tag)")
	ErrCanceled       = errors.New("operation canceled by user")
	ErrMustForce      = errors.New("operation must be forced")
	ErrNotRoot        = errors.New("operation must be run as root")
)

// CheckIfRoot returns an error if the current user is not the root user.
func CheckIfRoot() error {
	if id := util.CurrentUserID(); id != 0 {
		return errors.Wrapf(ErrNotRoot, "user %s", util.GetUser(id).Username)
	}
	return nil
}