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// 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.
//go:build (!cgo && !darwin && !windows && !plan9) || android || (osusergo && !windows && !plan9)
package user
import (
"fmt"
"os"
"runtime"
"strconv"
)
var (
// unused variables (in this implementation)
// modified during test to exercise code paths in the cgo implementation.
userBuffer = 0
groupBuffer = 0
)
func current() (*User, error) {
uid := currentUID()
// $USER and /etc/passwd may disagree; prefer the latter if we can get it.
// See issue 27524 for more information.
u, err := lookupUserId(uid)
if err == nil {
return u, nil
}
homeDir, _ := os.UserHomeDir()
u = &User{
Uid: uid,
Gid: currentGID(),
Username: os.Getenv("USER"),
Name: "", // ignored
HomeDir: homeDir,
}
// On Android, return a dummy user instead of failing.
switch runtime.GOOS {
case "android":
if u.Uid == "" {
u.Uid = "1"
}
if u.Username == "" {
u.Username = "android"
}
}
// cgo isn't available, but if we found the minimum information
// without it, use it:
if u.Uid != "" && u.Username != "" && u.HomeDir != "" {
return u, nil
}
var missing string
if u.Username == "" {
missing = "$USER"
}
if u.HomeDir == "" {
if missing != "" {
missing += ", "
}
missing += "$HOME"
}
return u, fmt.Errorf("user: Current requires cgo or %s set in environment", missing)
}
func currentUID() string {
if id := os.Getuid(); id >= 0 {
return strconv.Itoa(id)
}
// Note: Windows returns -1, but this file isn't used on
// Windows anyway, so this empty return path shouldn't be
// used.
return ""
}
func currentGID() string {
if id := os.Getgid(); id >= 0 {
return strconv.Itoa(id)
}
return ""
}
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