| // 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 && !fuchsia && !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 "" |
| } |