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files.go
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files.go
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package files
import (
"errors"
"io"
"io/ioutil"
"os"
"path/filepath"
)
// CopyFile copies file
func CopyFile(src, dst string) (err error) {
in, err := os.Open(src)
if err != nil {
return
}
defer in.Close()
out, err := os.Create(dst)
if err != nil {
return
}
defer func() {
if e := out.Close(); e != nil {
err = e
}
}()
_, err = io.Copy(out, in)
if err != nil {
return
}
err = out.Sync()
if err != nil {
return
}
si, err := os.Stat(src)
if err != nil {
return
}
err = os.Chmod(dst, si.Mode())
if err != nil {
return
}
return
}
// CopyDir copies directory
func CopyDir(src string, dst string) (err error) {
src = filepath.Clean(src)
dst = filepath.Clean(dst)
si, err := os.Stat(src)
if err != nil {
return
}
if !si.IsDir() {
err = errors.New("source is not a directory")
return
}
_, err = os.Stat(dst)
if err != nil && !os.IsNotExist(err) {
return
}
if err == nil {
err = errors.New("destination already exists")
}
err = os.MkdirAll(dst, si.Mode())
if err != nil {
return
}
entries, err := ioutil.ReadDir(src)
if err != nil {
return
}
for _, entry := range entries {
srcPath := filepath.Join(src, entry.Name())
dstPath := filepath.Join(dst, entry.Name())
if entry.IsDir() {
err = CopyDir(srcPath, dstPath)
if err != nil {
return
}
} else {
// Skip symlinks.
if entry.Mode()&os.ModeSymlink != 0 {
continue
}
err = CopyFile(srcPath, dstPath)
if err != nil {
return
}
}
}
return
}
// FileExists checks if file exists
func FileExists(filename string) bool {
info, err := os.Stat(filename)
if os.IsNotExist(err) {
return false
}
return !info.IsDir()
}
// MakeDirIfNotExist makes directory if it doesn't exist
func MakeDirIfNotExist(location string) error {
if _, err := os.Stat(location); os.IsNotExist(err) {
err = os.MkdirAll(location, os.ModePerm)
if err != nil {
return err
}
}
return nil
}