Re: [boost] [filesystems] file for rename not found

Subject: Re: [boost] [filesystems] file for rename not found
From: Florian Lindner (mailinglists_at_[hidden])
Date: 2019-03-14 09:04:20

Sorry for the missing subject, hit the send button accidentally. 

Am 14.03.19 um 09:31 schrieb Florian Lindner via Boost:
> Hello,
> 
> I have this innocent piece of code:
> 
>   namespace fs = boost::filesystem;
>   auto path = getFilename(); // returns a string
>   fs::create_directories(fs::path(path).parent_path());
>   std::ofstream ofs(path + "~");
>   ofs << info;
>   ofs.close();
>   fs::rename(path + "~", path);
> 
> which causes the exception:
> 
> boost::filesystem::rename: No such file or directory: "../9f/061b4f7a5e529c964659226eedd4e5~", "../9f/061b4f7a5e529c964659226eedd4e5"
> 
> However, I have no idea how that could happen. I use the rename, so that a reading process never sees an empty file, but only no file or filed with info. Is there any race involved between ofs.close() and fs:rename()? The code was executed on a distributed network filesystem (lustre).
> 
> Any ideas anyone?
> 
> Thanks,
> Florian
> 
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