tea/modules/utils/home.go

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2018-09-03 14:43:00 +08:00
// Copyright 2018 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package utils
import (
"bytes"
"errors"
"os"
"os/exec"
"os/user"
"runtime"
"strconv"
"strings"
)
// Home returns the home directory for the executing user.
//
// This uses an OS-specific method for discovering the home directory.
// An error is returned if a home directory cannot be detected.
func Home() (string, error) {
user, err := user.Current()
if nil == err {
return user.HomeDir, nil
}
// cross compile support
if "windows" == runtime.GOOS {
return homeWindows()
}
// Unix-like system, so just assume Unix
return homeUnix()
}
func homeUnix() (string, error) {
// First prefer the HOME environmental variable
if home := os.Getenv("HOME"); home != "" {
return home, nil
}
// If that fails, try getent
var stdout bytes.Buffer
cmd := exec.Command("getent", "passwd", strconv.Itoa(os.Getuid()))
cmd.Stdout = &stdout
if err := cmd.Run(); err != nil {
// If the error is ErrNotFound, we ignore it. Otherwise, return it.
if err != exec.ErrNotFound {
return "", err
}
} else {
if passwd := strings.TrimSpace(stdout.String()); passwd != "" {
// username:password:uid:gid:gecos:home:shell
passwdParts := strings.SplitN(passwd, ":", 7)
if len(passwdParts) > 5 {
return passwdParts[5], nil
}
}
}
// If all else fails, try the shell
stdout.Reset()
cmd = exec.Command("sh", "-c", "cd && pwd")
cmd.Stdout = &stdout
if err := cmd.Run(); err != nil {
return "", err
}
result := strings.TrimSpace(stdout.String())
if result == "" {
return "", errors.New("blank output when reading home directory")
}
return result, nil
}
func homeWindows() (string, error) {
// First prefer the HOME environmental variable
if home := os.Getenv("HOME"); home != "" {
return home, nil
}
drive := os.Getenv("HOMEDRIVE")
path := os.Getenv("HOMEPATH")
home := drive + path
if drive == "" || path == "" {
home = os.Getenv("USERPROFILE")
}
if home == "" {
return "", errors.New("HOMEDRIVE, HOMEPATH, and USERPROFILE are blank")
}
return home, nil
}