[go-nuts] Create a file and control whether to overwrite or not

[DrGo]

Hello,
The default behaviour of os.Create is to truncate the file if already 
exists. I wrote the code below to control whether the file should be 
overwritten or not (possibly based on user wishes). Seems to work on MacOS.
Do you think this code will work on Windows and Linux? Do you see any 
subtle issues with races etc.

Thanks,

func CreateFile(fileName string, overWrite bool) (out *os.File, err error) {
    out, err = os.OpenFile(fileName, os.O_RDWR|os.O_CREATE|os.O_EXCL, 0666)
    switch {
    case os.IsExist(err): //failed because file already exists
        if overWrite {
            return os.OpenFile(fileName, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 
0666) //overwrite it
        }
        return nil, fmt.Errorf("file %s already exists", fileName)
    default: //no errors or errors other than file exists
        return out, err
    }
}

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