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/*
* util.go - Functions for dealing with users
*
* 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"
"os"
"os/user"
"strconv"
)
// CurrentUserID returns the uid of the effective user.
func CurrentUserID() int {
return os.Geteuid()
}
// GetUser returns the user entry corresponding to the provided uid.
func GetUser(uid int) *user.User {
uidString := strconv.Itoa(uid)
foundUser, err := user.LookupId(uidString)
if err != nil {
return &user.User{
Uid: uidString,
Username: fmt.Sprintf("[uid=%d]", uid),
}
}
return foundUser
}
// CurrentUser returns the user entry for the effective user.
func CurrentUser() *user.User {
return GetUser(CurrentUserID())
}
// CheckIfRoot returns ErrNotRoot if the current user is not the root user.
func CheckIfRoot() error {
if id := CurrentUserID(); id != 0 {
return ErrNotRoot
}
return nil
}
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