Hi Marco,
On 14.07.2011 15:13, Marco Gaiarin wrote:
Mandi! heiko.hel...@horiba.com
In chel di` si favelave...
Great idea! But this'll require another external tool, because hash calculation
via WSH is a world of slow.
I've speaked about a script exactly for that.
It is trivial in a CMD script to execute firstly curl/wget to download
files, check exit code and if '0', run 'md5 -c' as in:
http://www.fourmilab.ch/md5/
and do and 'exit 0' if and only if both retun zero.
Is there a reason this could not be done using existing commands?
At first look this request somehow looks like someone would use the download tag
just to launch an external program or script with some parameters. This is done
on install/upgrade/downgrade/remove if the download tag is used. But to execute
commands there is already a tag: <install />, <upgrade />, <remove /> and
<downgrade />.
There is no requirement that these commands can only launch installers. In fact
it's even the case that many packages use these commands to do preparation or
post-install work. So simply calling a script with some parameters (e.g.
download URL, download target, MD5-sum) the script could take care about
downloading and checksumming the file. If anything fails it just returns an exit
code different to 0 to indicate an error so WPKG will stop the installation.
I know that the <download /> tag is very limited but the reasons for it have
been listed already in this discussion. But I am not sure if there is good
reason to abuse the download tag just to invoke some external download tools
when such a thing can be done already using existing functionality.
Well, probably I am just weary today but somebody might explain in detail why
using existing commands is not an option or why the download tag would be much
better to achieve this.
I agree that using a "special download command" flag would be possible too. I
would then prefer to call a cmd script (included in wplkg distribution) with all
required parameters like
downloader.cmd <URL> <target> <MD5>
So this script could handle download and verification as needed using any tool
you like and any flags suitable for your environment (e.g. proxy flags).
Well, still I am not sure where the advantage over using this script as one of
the first commands would be.
br,
Rainer
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