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package os
import (
"errors"
"fmt"
"io"
"os"
"os/signal"
"syscall"
)
type logger interface {
Info(msg string, keyvals ...interface{})
}
// TrapSignal catches SIGTERM and SIGINT, executes the cleanup function,
// and exits with code 0.
func TrapSignal(logger logger, cb func()) {
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt, syscall.SIGTERM)
go func() {
sig := <-c
logger.Info(fmt.Sprintf("captured %v, exiting...", sig))
if cb != nil {
cb()
}
os.Exit(0)
}()
}
// EnsureDir ensures the given directory exists, creating it if necessary.
// Errors if the path already exists as a non-directory.
func EnsureDir(dir string, mode os.FileMode) error {
err := os.MkdirAll(dir, mode)
if err != nil {
return fmt.Errorf("could not create directory %q: %w", dir, err)
}
return nil
}
func FileExists(filePath string) bool {
_, err := os.Stat(filePath)
return !os.IsNotExist(err)
}
// CopyFile copies a file. It truncates the destination file if it exists.
func CopyFile(src, dst string) error {
srcfile, err := os.Open(src)
if err != nil {
return err
}
defer srcfile.Close()
info, err := srcfile.Stat()
if err != nil {
return err
}
if info.IsDir() {
return errors.New("cannot read from directories")
}
// create new file, truncate if exists and apply same permissions as the original one
dstfile, err := os.OpenFile(dst, os.O_RDWR|os.O_CREATE|os.O_TRUNC, info.Mode().Perm())
if err != nil {
return err
}
defer dstfile.Close()
_, err = io.Copy(dstfile, srcfile)
return err
}