multiple distfiles from multiple sources and with multiple compression types

[Ryan Schmidt]

On Mar 30, 2016, at 3:06 PM, Mojca Miklavec wrote:

> On 30 March 2016 at 19:25, René J. V. wrote:
>> 
>>> It is fairly obvious how to extract these files. There is usually no
>>> need to specify how these files should be extracted, since most
>>> compression methods can be deduced from the filename.
>>> 
>>> The command 'use_* yes' would then only set the extract.suffix
>>> accordingly, instead of the explicit extract.cmd. These two options
>>> would then be equivalent:
>>> 
>>> use_xz yes
>>> extract.suffix .tar.xz
>> 
>> Still, how would that be implemented in "base", except by an algorithm that
>> determines how to extract each file (that is to be handled in the extract phase)
>> based on the filename or (better) from a magic cookie?
> 
> Those are the details. If a distfile has a standard extension, it's no
> problem figuring out how to extract it.

libmagic should be used to determine the compression format; filename extension should not be used.