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oss.go
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oss.go
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// Pipe - A small and beautiful blogging platform written in golang.
// Copyright (C) 2017-2019, b3log.org & hacpai.com
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package util
import (
"bytes"
"errors"
"os"
"os/exec"
"os/user"
"path/filepath"
"runtime"
"strings"
)
// IsWindows determines whether current OS is Windows.
func IsWindows() bool {
return "windows" == runtime.GOOS
}
// Pwd gets the path of current working directory.
func Pwd() string {
file, _ := exec.LookPath(os.Args[0])
pwd, _ := filepath.Abs(file)
return filepath.Dir(pwd)
}
// UserHome 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 UserHome() (string, error) {
user, err := user.Current()
if nil == err {
return user.HomeDir, nil
}
if IsWindows() {
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 the shell
var stdout bytes.Buffer
cmd := exec.Command("sh", "-c", "eval echo ~$USER")
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) {
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
}