go lookup 源码
golang lookup 代码
文件路径：/src/os/user/lookup.go
// 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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