github.com/zxy12/golang_with_comment@v0.0.0-20190701084843-0e6b2aff5ef3/os/user/lookup_plan9.go (about)

     1  // Copyright 2013 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package user
     6  
     7  import (
     8  	"fmt"
     9  	"io/ioutil"
    10  	"os"
    11  	"syscall"
    12  )
    13  
    14  // Partial os/user support on Plan 9.
    15  // Supports Current(), but not Lookup()/LookupId().
    16  // The latter two would require parsing /adm/users.
    17  const (
    18  	userFile = "/dev/user"
    19  )
    20  
    21  func init() {
    22  	groupImplemented = false
    23  }
    24  
    25  func current() (*User, error) {
    26  	ubytes, err := ioutil.ReadFile(userFile)
    27  	if err != nil {
    28  		return nil, fmt.Errorf("user: %s", err)
    29  	}
    30  
    31  	uname := string(ubytes)
    32  
    33  	u := &User{
    34  		Uid:      uname,
    35  		Gid:      uname,
    36  		Username: uname,
    37  		Name:     uname,
    38  		HomeDir:  os.Getenv("home"),
    39  	}
    40  
    41  	return u, nil
    42  }
    43  
    44  func lookupUser(username string) (*User, error) {
    45  	return nil, syscall.EPLAN9
    46  }
    47  
    48  func lookupUserId(uid string) (*User, error) {
    49  	return nil, syscall.EPLAN9
    50  }
    51  
    52  func lookupGroup(groupname string) (*Group, error) {
    53  	return nil, syscall.EPLAN9
    54  }
    55  
    56  func lookupGroupId(string) (*Group, error) {
    57  	return nil, syscall.EPLAN9
    58  }
    59  
    60  func listGroups(*User) ([]string, error) {
    61  	return nil, syscall.EPLAN9
    62  }