1 files changed, 83 insertions, 0 deletions
diff --git a/src/os/user/lookup_stubs.go b/src/os/user/lookup_stubs.go
new file mode 100644
index 0000000..89dfe45
--- /dev/null
+++ b/src/os/user/lookup_stubs.go
@@ -0,0 +1,83 @@
+// 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 ""
+}