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Source file src/os/user/lookup.go

Documentation: os/user

  // 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.
  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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