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[bug-cppi] Re: [PATCH] Add new option --in-place

From: Pádraig Brady
Subject: [bug-cppi] Re: [PATCH] Add new option --in-place
Date: Thu, 25 Mar 2010 11:30:45 +0000
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20100227 Thunderbird/3.0.3

On 24/03/10 12:15, Pádraig Brady wrote:
> Also I noticed that `mv -b ./file.tmp ./file` is not atomic
> because the renames are done like: rename(file,bak); rename(tmp,file);

I summarized the issues involved with replacing files and it was surprisingly 

It was indirectly suggested there to use hardlinks for atomic backups,
which I've amended the attached script to do.  Other changes include
falling back to cp -a if --attributes-only is not supported, and
correctly removing all temp files.

I wonder should `mv -b` (and sed -i) use the ln method to
try to be atomic and then fall back to the double rename?
I'll look into it at some stage.


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