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Date: Fri, 29 Mar 2013 19:31:40 +0400
From: Andrey Repin <anrdaemon AT freemail DOT ru>
Reply-To: Andrey Repin <cygwin AT cygwin DOT com>
Message-ID: <1846269758.20130329193140@mtu-net.ru>
To: Bill Priest <priestwilliaml AT gmail DOT com>, cygwin AT cygwin DOT com
Subject: Re: cp "skipping file ..., as it was replaced while being copied
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Greetings, Bill Priest!

> All,
>   I've been using a program/device driver that maps an FTP site to a
> windows drive (yes I know about the Windows 7 way to do almost the
> same thing; but I could only get to the share using windows explorer
> and not cygwin) and things work pretty well except when I try to do a
> simple cp file1.txt file2.txt I get the following:

> /usr/bin/cp: skipping file `file1.txt', as it was replaced while being copied

> I found the "offending" code in copy.c and commented it out and the
> resulting excutable then "works".  I'm not sure why the inodes are the
> same for both files.  I've never seen this w/ samba or "normal"
> network shares; I guess it is a bug in the driver implementation
> (however, mv file1.txt file2.txt, cat file1.txt > file2.txt, and other
> commands I have tried work w/o issue).  I'm not sure what the code is
> trying to protect against (once the open works shouldn't you be able
> to trust the OS that the rest will work)??

> I'm not reporting this as a bug as much as trying intellectual
> curiosity of why the code is doing it.

Search archives, this is not the first time this issue is brought to light.
TL;DR: your bridge program does not behave as proper FS.
That aside, why you are not using more efficient and secure means of file transfer?

> Bill

> diff -u copy.c~ copy.c
> --- copy.c~ 2013-03-28 13:48:47.923995100 -0500
> +++ copy.c 2013-03-29 08:49:03.795004400 -0500
> @@ -835,6 +835,7 @@

> /* Compare the source dev/ino from the open file to the incoming,
>     saved ones obtained via a previous call to stat. */
> +#if 0
> if (! SAME_INODE (*src_sb, src_open_sb))
>   {
>     error (0, 0,
> @@ -843,7 +844,7 @@
>     return_val = false;
>     goto close_src_desc;
>   }
> -
> +#endif
>       /* The semantics of the following open calls are mandated
>           by the specs for both cp and mv. */
>       if (! *new_dst)

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--
WBR,
Andrey Repin (anrdaemon AT freemail DOT ru) 29.03.2013, <19:29>

Sorry for my terrible english...


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