Re: Downloader for "wrapped" tarbar?

[Hartmut Goebel]

Am 02.06.20 um 21:41 schrieb Marius Bakke:
> It would be ideal to have an origin method that could extract the
> "inner" tarball, i.e. contents.tar.gz for hex.pm and data.tar.gz in the
> case of RubyGems.  As zimoun mentioned, a good place to start is look at
> how other origin methods are implemented such as url-fetch/tarbomb, etc.

I started implementing into this direction and would like your advice on
the design. I found two options:

1. When implementing some "url-fetch/wrapped" (name tdb), *two* items
will be kept in the store: the "outer" and the "inner" tarball. This is
since "url-fetch" and siblings use the built-in downloader, which AFAIK
always puts the downloaded files into the store.

In this case we need to check the hash of the "outer" tarball, as the
built-in downloader requires a hash to be passed and to match. But then
we can not check the hash of the "outer" tarball. How would this work
with substitutes and download-nar?

2. When implementing some "wrapped-fetch" (name tdb), modeled like
"git-fetch", there is no easy way for the user to verify the hash, as
this is taken from the "inner" tarball. How does this work with
substitutes, download-nar and SWH?

-- 
Regards
Hartmut Goebel

| Hartmut Goebel          | h.goebel@crazy-compilers.com               |
| www.crazy-compilers.com | compilers which you thought are impossible |

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