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- // Copyright 2011 The Go Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style
- // license that can be found in the LICENSE file.
- package user
- import "sync"
- // Current returns the current user.
- //
- // The first call will cache the current user information.
- // Subsequent calls will return the cached value and will not reflect
- // changes to the current user.
- func Current() (*User, error) {
- cache.Do(func() { cache.u, cache.err = current() })
- if cache.err != nil {
- return nil, cache.err
- }
- u := *cache.u // copy
- return &u, nil
- }
- // cache of the current user
- var cache struct {
- sync.Once
- u *User
- err error
- }
- // Lookup looks up a user by username. If the user cannot be found, the
- // returned error is of type UnknownUserError.
- func Lookup(username string) (*User, error) {
- if u, err := Current(); err == nil && u.Username == username {
- return u, err
- }
- return lookupUser(username)
- }
- // LookupId looks up a user by userid. If the user cannot be found, the
- // returned error is of type UnknownUserIdError.
- func LookupId(uid string) (*User, error) {
- if u, err := Current(); err == nil && u.Uid == uid {
- return u, err
- }
- return lookupUserId(uid)
- }
- // LookupGroup looks up a group by name. If the group cannot be found, the
- // returned error is of type UnknownGroupError.
- func LookupGroup(name string) (*Group, error) {
- return lookupGroup(name)
- }
- // LookupGroupId looks up a group by groupid. If the group cannot be found, the
- // returned error is of type UnknownGroupIdError.
- func LookupGroupId(gid string) (*Group, error) {
- return lookupGroupId(gid)
- }
- // GroupIds returns the list of group IDs that the user is a member of.
- func (u *User) GroupIds() ([]string, error) {
- return listGroups(u)
- }
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