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143 lines
2.9 KiB
143 lines
2.9 KiB
package common
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import (
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"bufio"
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"fmt"
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"io"
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"io/ioutil"
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"os"
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"os/exec"
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"os/signal"
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"strings"
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"syscall"
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)
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var gopath string
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// GoPath returns GOPATH env variable value. If it is not set, this function
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// will try to call `go env GOPATH` subcommand.
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func GoPath() string {
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if gopath != "" {
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return gopath
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}
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path := os.Getenv("GOPATH")
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if len(path) == 0 {
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goCmd := exec.Command("go", "env", "GOPATH")
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out, err := goCmd.Output()
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if err != nil {
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panic(fmt.Sprintf("failed to determine gopath: %v", err))
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}
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path = string(out)
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}
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gopath = path
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return path
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}
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type logger interface {
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Info(msg string, keyvals ...interface{})
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}
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// TrapSignal catches the SIGTERM/SIGINT and executes cb function. After that it exits
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// with code 0.
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func TrapSignal(logger logger, cb func()) {
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c := make(chan os.Signal, 1)
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signal.Notify(c, os.Interrupt, syscall.SIGTERM)
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go func() {
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for sig := range c {
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logger.Info(fmt.Sprintf("captured %v, exiting...", sig))
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if cb != nil {
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cb()
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}
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os.Exit(0)
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}
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}()
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}
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// Kill the running process by sending itself SIGTERM.
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func Kill() error {
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p, err := os.FindProcess(os.Getpid())
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if err != nil {
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return err
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}
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return p.Signal(syscall.SIGTERM)
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}
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func Exit(s string) {
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fmt.Printf(s + "\n")
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os.Exit(1)
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}
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func EnsureDir(dir string, mode os.FileMode) error {
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if _, err := os.Stat(dir); os.IsNotExist(err) {
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err := os.MkdirAll(dir, mode)
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if err != nil {
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return fmt.Errorf("Could not create directory %v. %v", dir, err)
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}
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}
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return nil
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}
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func IsDirEmpty(name string) (bool, error) {
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f, err := os.Open(name)
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if err != nil {
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if os.IsNotExist(err) {
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return true, err
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}
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// Otherwise perhaps a permission
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// error or some other error.
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return false, err
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}
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defer f.Close()
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_, err = f.Readdirnames(1) // Or f.Readdir(1)
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if err == io.EOF {
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return true, nil
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}
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return false, err // Either not empty or error, suits both cases
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}
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func FileExists(filePath string) bool {
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_, err := os.Stat(filePath)
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return !os.IsNotExist(err)
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}
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func ReadFile(filePath string) ([]byte, error) {
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return ioutil.ReadFile(filePath)
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}
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func MustReadFile(filePath string) []byte {
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fileBytes, err := ioutil.ReadFile(filePath)
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if err != nil {
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Exit(fmt.Sprintf("MustReadFile failed: %v", err))
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return nil
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}
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return fileBytes
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}
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func WriteFile(filePath string, contents []byte, mode os.FileMode) error {
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return ioutil.WriteFile(filePath, contents, mode)
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}
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func MustWriteFile(filePath string, contents []byte, mode os.FileMode) {
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err := WriteFile(filePath, contents, mode)
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if err != nil {
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Exit(fmt.Sprintf("MustWriteFile failed: %v", err))
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}
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}
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//--------------------------------------------------------------------------------
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func Prompt(prompt string, defaultValue string) (string, error) {
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fmt.Print(prompt)
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reader := bufio.NewReader(os.Stdin)
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line, err := reader.ReadString('\n')
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if err != nil {
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return defaultValue, err
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}
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line = strings.TrimSpace(line)
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if line == "" {
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return defaultValue, nil
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}
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return line, nil
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}
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