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Re: [Bug-wget] wget -N timestamp sometimes off by one second

From: Ángel González
Subject: Re: [Bug-wget] wget -N timestamp sometimes off by one second
Date: Fri, 06 Apr 2012 01:01:15 +0200
User-agent: Thunderbird

On 05/04/12 21:51, Daniel A. Nagy wrote:
> Version: 1.13.4
> Operating System: OpenWrt 10.03.1
> Kernel: Linux
> Filesystem: vfat
> What happens is that wget -N writes a filestamp that is one second
> earlier than the Last-modified HTTP header and therefore when invoked
> again, downloads the same file again even though it should not. So, the
> timestamp it uses for comparison is right, but the one that ends up
> written on the filesystem is wrong.
> It's not even consistent, with most files it works okay, but for some,
> it does not work. So far, I did not manage to find any pattern in those
> files that end up mis-timestamped.
vfat has a two-second precision for modified time. If the file was last
in an odd second (if I remember right), the filesystem will store it in
the even
one, thus always showing as modified. Many tools get fooled with that, such
as make.

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