[Suggestion] change in wget-scripts

Richard Betel RBetel at rim.com
Mon Jan 3 09:40:29 PST 2005


If the file exists, but has a bad MD5, we could just rename it and then kick off wget. 
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The soul, secure in her existence, smiles at the drawn dagger and defies its point.

-----Original Message-----
From: alfs-discuss-bounces at linuxfromscratch.org <alfs-discuss-bounces at linuxfromscratch.org>
To: alfs-discuss at linuxfromscratch.org <alfs-discuss at linuxfromscratch.org>
Sent: Mon Jan 03 12:07:45 2005
Subject: Re: [Suggestion] change in wget-scripts

HNY eyeryone.

Any comments to the following?

Torsten Vollmann schrieb:

> Hi all.
> 
> Right now the wget scripts in the profiles use the -nc option as 
> suggested some months ago by Richard A Downing. The intention is not to 
> download an already existing file a second time.
> 
> The problem with the -nc option is that it only checks for the existence 
> of the given file. Now there could be the case that the download is 
> interrupted resulting in a partially downloaded file. When the wget 
> script is reinvoked this file wouldn't be completed!
> 
> So I suggest a change from the '-nc' option to the '-N -r -nd' options:
> 
> The -N option compares the creation-time and size of the files and 
> starts the download if they differ.
> 
> The -r option results in the already existing file to be overwritten 
> instead of a .1 file beeing created.
> 
> In my tests of the -N -r options wget somehow gets to creating the 
> directory-structure of the hosting server so the -nd option must also be 
> given to prevent it from doing that.
> 
> 
> The benefit of these options is the assurance that the files are 
> completely downloaded, the downside is that for every file in the list 
> wget has to obtain the size and date of the hosted file. This could 
> count in if one has limits in bandwith etc.
> 
> Cheers,
> 
> Torsten.

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