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io.go
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/
io.go
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package glue
import (
"encoding/json"
"io"
"os"
"github.com/pkg/errors"
)
func isZero(path string) bool {
stat, err := os.Stat(path)
if os.IsNotExist(err) {
return false
}
if err != nil {
return true
}
return stat.Size() == 0
}
func copyToExistingFile(to, from string) error {
src, err := os.Open(from)
if err != nil {
return errors.Wrap(err, "opening file "+from)
}
defer src.Close()
dest, err := os.OpenFile(to, os.O_RDWR|os.O_TRUNC, 0666)
if err != nil {
return errors.Wrap(err, "opening file "+to)
}
defer dest.Close()
_, err = io.Copy(dest, src)
return err
}
func readJSONFile(file string, obj interface{}) error {
f, err := os.Open(file)
if err != nil {
return errors.Wrap(err, "opening "+file)
}
defer f.Close()
if err := json.NewDecoder(f).Decode(obj); err != nil {
return errors.Wrap(err, "unmarshaling "+file)
}
return nil
}