lookup_stubs.go

Documentation: os/user

     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 && !darwin && !windows && !plan9) || android || (osusergo && !windows && !plan9)
     6  
     7  package user
     8  
     9  import (
    10  	"fmt"
    11  	"os"
    12  	"runtime"
    13  	"strconv"
    14  )
    15  
    16  var (
    17  	// unused variables (in this implementation)
    18  	// modified during test to exercise code paths in the cgo implementation.
    19  	userBuffer  = 0
    20  	groupBuffer = 0
    21  )
    22  
    23  func current() (*User, error) {
    24  	uid := currentUID()
    25  	// $USER and /etc/passwd may disagree; prefer the latter if we can get it.
    26  	// See issue 27524 for more information.
    27  	u, err := lookupUserId(uid)
    28  	if err == nil {
    29  		return u, nil
    30  	}
    31  
    32  	homeDir, _ := os.UserHomeDir()
    33  	u = &User{
    34  		Uid:      uid,
    35  		Gid:      currentGID(),
    36  		Username: os.Getenv("USER"),
    37  		Name:     "", // ignored
    38  		HomeDir:  homeDir,
    39  	}
    40  	// On Android, return a dummy user instead of failing.
    41  	switch runtime.GOOS {
    42  	case "android":
    43  		if u.Uid == "" {
    44  			u.Uid = "1"
    45  		}
    46  		if u.Username == "" {
    47  			u.Username = "android"
    48  		}
    49  	}
    50  	// cgo isn't available, but if we found the minimum information
    51  	// without it, use it:
    52  	if u.Uid != "" && u.Username != "" && u.HomeDir != "" {
    53  		return u, nil
    54  	}
    55  	var missing string
    56  	if u.Username == "" {
    57  		missing = "$USER"
    58  	}
    59  	if u.HomeDir == "" {
    60  		if missing != "" {
    61  			missing += ", "
    62  		}
    63  		missing += "$HOME"
    64  	}
    65  	return u, fmt.Errorf("user: Current requires cgo or %s set in environment", missing)
    66  }
    67  
    68  func currentUID() string {
    69  	if id := os.Getuid(); id >= 0 {
    70  		return strconv.Itoa(id)
    71  	}
    72  	// Note: Windows returns -1, but this file isn't used on
    73  	// Windows anyway, so this empty return path shouldn't be
    74  	// used.
    75  	return ""
    76  }
    77  
    78  func currentGID() string {
    79  	if id := os.Getgid(); id >= 0 {
    80  		return strconv.Itoa(id)
    81  	}
    82  	return ""
    83  }
    84
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