libgo/go/os/user/lookup_stubs.go

   1 // Copyright 2011 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 //go:build (!cgo && !windows && !plan9) || android || (osusergo && !windows && !plan9)
   6
   7 package user
   8
   9 import (
  10         "fmt"
  11         "os"
  12         "runtime"
  13         "strconv"
  14 )
  15
  16 func current() (*User, error) {
  17         uid := currentUID()
  18         // $USER and /etc/passwd may disagree; prefer the latter if we can get it.
  19         // See issue 27524 for more information.
  20         u, err := lookupUserId(uid)
  21         if err == nil {
  22                 return u, nil
  23         }
  24
  25         homeDir, _ := os.UserHomeDir()
  26         u = &User{
  27                 Uid:      uid,
  28                 Gid:      currentGID(),
  29                 Username: os.Getenv("USER"),
  30                 Name:     "", // ignored
  31                 HomeDir:  homeDir,
  32         }
  33         // On Android, return a dummy user instead of failing.
  34         switch runtime.GOOS {
  35         case "android":
  36                 if u.Uid == "" {
  37                         u.Uid = "1"
  38                 }
  39                 if u.Username == "" {
  40                         u.Username = "android"
  41                 }
  42         }
  43         // cgo isn't available, but if we found the minimum information
  44         // without it, use it:
  45         if u.Uid != "" && u.Username != "" && u.HomeDir != "" {
  46                 return u, nil
  47         }
  48         var missing string
  49         if u.Username == "" {
  50                 missing = "$USER"
  51         }
  52         if u.HomeDir == "" {
  53                 if missing != "" {
  54                         missing += ", "
  55                 }
  56                 missing += "$HOME"
  57         }
  58         return u, fmt.Errorf("user: Current requires cgo or %s set in environment", missing)
  59 }
  60
  61 func currentUID() string {
  62         if id := os.Getuid(); id >= 0 {
  63                 return strconv.Itoa(id)
  64         }
  65         // Note: Windows returns -1, but this file isn't used on
  66         // Windows anyway, so this empty return path shouldn't be
  67         // used.
  68         return ""
  69 }
  70
  71 func currentGID() string {
  72         if id := os.Getgid(); id >= 0 {
  73                 return strconv.Itoa(id)
  74         }
  75         return ""
  76 }