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common.go
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common.go
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package pkg
import (
"bytes"
"errors"
"os"
"os/exec"
"os/user"
"runtime"
"strings"
)
func ChangeYourCmdEnvironment(cmd *exec.Cmd) error {
env := os.Environ()
cmdEnv := []string{}
for _, e := range env {
i := strings.Index(e, "=")
if i > 0 && (e[:i] == "ENV_NAME") {
// do yourself
} else {
cmdEnv = append(cmdEnv, e)
}
}
cmd.Env = cmdEnv
return nil
}
func ExecCommandString(cmd string) (string, error) {
pipeline := exec.Command("/bin/bash", "-c", cmd)
ChangeYourCmdEnvironment(pipeline)
var out bytes.Buffer
var stderr bytes.Buffer
pipeline.Stdout = &out
pipeline.Stderr = &stderr
err := pipeline.Run()
if err != nil {
return stderr.String(), err
}
return out.String(), nil
}
// 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 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
}
func IsPathExists(path string) bool {
_, err := os.Stat(path)
if err == nil {
return true
}
if os.IsNotExist(err) {
return false
}
return false
}