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// Copyright 2017 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.
package internal
import (
"errors"
"fmt"
"io/ioutil"
"os"
"os/user"
"path/filepath"
"runtime"
"strings"
)
const gopsConfigDirEnvKey = "GOPS_CONFIG_DIR"
func ConfigDir() (string, error) {
if configDir := os.Getenv(gopsConfigDirEnvKey); configDir != "" {
return configDir, nil
}
if runtime.GOOS == "windows" {
return filepath.Join(os.Getenv("APPDATA"), "gops"), nil
}
homeDir := guessUnixHomeDir()
if homeDir == "" {
return "", errors.New("unable to get current user home directory: os/user lookup failed; $HOME is empty")
}
return filepath.Join(homeDir, ".config", "gops"), nil
}
func guessUnixHomeDir() string {
usr, err := user.Current()
if err == nil {
return usr.HomeDir
}
return os.Getenv("HOME")
}
func PIDFile(pid int) (string, error) {
gopsdir, err := ConfigDir()
if err != nil {
return "", err
}
return fmt.Sprintf("%s/%d", gopsdir, pid), nil
}
func GetPort(pid int) (string, error) {
portfile, err := PIDFile(pid)
if err != nil {
return "", err
}
b, err := ioutil.ReadFile(portfile)
if err != nil {
return "", err
}
port := strings.TrimSpace(string(b))
return port, nil
}
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