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copydir.go
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copydir.go
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package main
//https://gist.github.com/jaybill/2876519
import "os"
import "io"
import "io/ioutil"
import "log"
// Copies file source to destination dest.
func CopyFile(source string, dest string) (err error) {
sf, err := os.Open(source)
if err != nil {
return err
}
defer sf.Close()
df, err := os.Create(dest)
if err != nil {
return err
}
defer df.Close()
_, err = io.Copy(df, sf)
if err == nil {
si, err := os.Stat(source)
if err != nil {
err = os.Chmod(dest, si.Mode())
}
}
return
}
// Recursively copies a directory tree, attempting to preserve permissions.
// Source directory must exist, destination directory must *not* exist.
func CopyDir(source string, dest string) (err error) {
// get properties of source dir
fi, err := os.Stat(source)
if err != nil {
return err
}
if !fi.IsDir() {
return &CustomError{"Source is not a directory"}
}
// ensure dest dir does not already exist
_, err = os.Open(dest)
if !os.IsNotExist(err) {
return &CustomError{"Destination already exists"}
}
// create dest dir
err = os.MkdirAll(dest, fi.Mode())
if err != nil {
return err
}
entries, err := ioutil.ReadDir(source)
for _, entry := range entries {
sfp := source + "/" + entry.Name()
dfp := dest + "/" + entry.Name()
if entry.IsDir() {
err = CopyDir(sfp, dfp)
if err != nil {
log.Println(err)
}
} else {
// perform copy
err = CopyFile(sfp, dfp)
if err != nil {
log.Println(err)
}
}
}
return
}
// A struct for returning custom error messages
type CustomError struct {
What string
}
// Returns the error message defined in What as a string
func (e *CustomError) Error() string {
return e.What
}