package main import ( "bufio" "io" "io/ioutil" "os" "path/filepath" "multini/types" ) // Source: https://gist.github.com/var23rav/23ae5d0d4d830aff886c3c970b8f6c6b /* GoLang: os.Rename() give error "invalid cross-device link" for Docker container with Volumes. MoveFile(source, destination) will work moving file between folders */ func tryMoveFile(sourcePath, destPath string) error { inputFile, err := os.Open(sourcePath) if err != nil { return err } outputFile, err := os.Create(destPath) if err != nil { inputFile.Close() return err } defer outputFile.Close() _, err = io.Copy(outputFile, inputFile) inputFile.Close() if err != nil { return err } // The copy was successful, so now delete the original file err = os.Remove(sourcePath) if err != nil { return err } return nil } func tryRemoveRenameFile(sourcePath, destPath string) bool { err := os.Remove(destPath) if err != nil { return false } err = os.Rename(sourcePath, destPath) if err != nil { return false } return true } func replaceOriginal(oldFile, newFile string) error { realOldFile, err := filepath.EvalSymlinks(oldFile) if err != nil { return err } infoOldFile, err := os.Stat(realOldFile) if err != nil { return err } mode := infoOldFile.Mode() var uid, gid int = GetUidGid(infoOldFile) if !tryRemoveRenameFile(newFile, realOldFile) { err = tryMoveFile(newFile, realOldFile) if err != nil { return err } } err = os.Chmod(realOldFile, mode) if err != nil { return err } // try to restore original uid/gid // don't worry if we can't os.Chown(realOldFile, uid, gid) return err } func iniWrite(filename string, ini *types.Ini) error { tmpFile, err := ioutil.TempFile(os.TempDir(), "multini") if err == nil { datawriter := bufio.NewWriter(tmpFile) _, err = datawriter.WriteString(ini.Full()) if err == nil { err = datawriter.Flush() tmpFile.Close() if err == nil { err = replaceOriginal(filename, tmpFile.Name()) } } } return err } func iniWriteInplace(filename string, ini *types.Ini) error { realfilename, err := filepath.EvalSymlinks(filename) mode := os.FileMode(int(0644)) if os.IsNotExist(err) { realfilename = filename } else if err != nil { return err } else { info, err := os.Stat(realfilename) if err != nil { return err } mode = info.Mode() } targetFile, err := os.OpenFile(realfilename, os.O_WRONLY|os.O_CREATE, mode) if err == nil { datawriter := bufio.NewWriter(targetFile) _, err = datawriter.WriteString(ini.Full()) if err == nil { err = datawriter.Flush() targetFile.Close() } } return err }