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