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Subject: Re: [boost] [filesystems] file for rename not found
From: Andrey Semashev (andrey.semashev_at_[hidden])
Date: 2019-03-14 09:11:44

On 3/14/19 12:04 PM, Florian Lindner via Boost wrote:
> 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?

I haven't had experience with Lustre, but I'm guessing it may be
related. Did you try calling fsync between close and rename?

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