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fileutils.go
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/
fileutils.go
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package main
import (
"fmt"
"io"
"path"
)
// Copy copies a file from src to dst.
// src and dest can be either absolute or relative paths.
func Copy(osfs OS, src, dst string) error {
sfi, err := osfs.Lstat(src)
if err != nil {
return err
}
if !sfi.Mode().IsRegular() {
return fmt.Errorf("Non-regular source file %s (%q)", sfi.Name(), sfi.Mode().String())
}
dfi, err := osfs.Stat(dst)
if err != nil {
if !osfs.IsNotExist(err) {
return err
}
// file not exists - do not do anything
} else {
// file exists - check it
if !(dfi.Mode().IsRegular()) {
return fmt.Errorf("Non-regular destination file %s (%q)", dfi.Name(), dfi.Mode().String())
}
}
err = copyFileContents(osfs, src, dst)
return err
}
// copyFileContents copies the contents of the file named src to the file named
// by dst. The file will be created if it does not already exist. If the
// destination file exists, all it's contents will be replaced by the contents
// of the source file.
func copyFileContents(osfs OS, src, dst string) (err error) {
in, err := osfs.Open(src)
if err != nil {
return
}
defer func() {
inCloseErr := in.Close()
if err == nil {
err = inCloseErr
}
}()
if err = osfs.MkdirAll(path.Dir(dst), 0700); err != nil {
return err
}
out, err := osfs.Create(dst)
if err != nil {
return
}
defer func() {
outCloseErr := out.Close()
if err == nil {
err = outCloseErr
}
}()
if _, err = io.Copy(out, in); err != nil {
return err
}
err = out.Sync()
return err
}