master_sites - avoiding redirects (was Re: [98933] trunk/dports/multimedia)

[Craig Treleaven]

At 12:22 AM +1100 10/22/12, Joshua Root wrote:
>On 2012-10-22 00:12 , Craig Treleaven wrote:
>>  Hi Ryan:
>>
>>  Thanks for all the improvements to the port.  For my education, I've
>>  seen the message quite a few times saying: "* rewrote master_sites to
>>  avoid HTTP redirects".  I see you used
>>
>>  'master_sites      
>>  sourceforge:project/mediainfo/binary/mediainfo/${version}'
>>
>>  How does one determine this?
>
>One easy way is to run:
>
>curl -IL URL
>
>which will show you if and where the existing URL is redirected.

OK, I think I've got it.  I started with someone else's portfile in 
this case where the 'master_sites        sourceforge' produced a 
working download.  Homepage is at http://mediainfo.sourceforge.net.

The first time I ran 'port fetch', the log showed:

DEBUG: Executing org.macports.fetch (mediainfo)
--->  MediaInfo_CLI_0.7.60_GNU_FromSource.tar.bz2 doesn't seem to 
exist in /opt/local/var/macports/distfiles/mediainfo
--->  Attempting to fetch MediaInfo_CLI_0.7.60_GNU_FromSource.tar.bz2 
from http://iweb.dl.sourceforge.net/mediainfo

Now, running 'curl -IL 
http://iweb.dl.sourceforge.net/mediainfo/MediaInfo_CLI_0.7.60_GNU_FromSource.tar.bz2' 
produced a bunch of output that included:

Location: 
http://voxel.dl.sourceforge.net/project/mediainfo/binary/mediainfo/0.7.60/MediaInfo_CLI_0.7.60_GNU_FromSource.tar.bz2

So the idea is to extract the bit: 
'project/mediainfo/binary/mediainfo/0.7.60' (and replace "0.7.60" 
with ${version}).

Is that right?  Would a How-to with examples like this be a good 
thing for the wiki?

Craig