bug#62129: [PATCH] guix: Improve download-nar.

[Christopher Baines]

Ludovic Courtès <ludo@gnu.org> writes:

> Hi Chris,
>
> Christopher Baines <mail@cbaines.net> skribis:
>
>> Previously download-nar worked with gzipped nars and queried
>> berlin.guix.gnu.org (also known as ci.guix.gnu.org). ci.guix.gnu.org no 
>> longer
>> serves gzipped nars so this is of limited use.
>>
>> This commit changes download-nar to query both the default substitute 
>> servers,
>> and queries for lzipped rather than gzipped nars, since those are available
>> from both.
>>
>> * guix/build/download-nar.scm (urls-for-item): Return urls for lzip rather
>> than gzip compression, and from both default substitute servers. The comment
>> about CDN's is no longer relevant.
>> (restore-gzipped-nar): Rename to restore-lzipped-nar and reimplement
>> accordingly.
>> (download-nar): Add progress reporting and switch to use lzip rather than
>> gzip.
>> * guix/cvs-download.scm (cvs-fetch): Replace guile-zlib with guile-lzlib.
>> * guix/git-download.scm (git-fetch): Replace guile-zlib with guile-lzlib.
>> * guix/hg-download.scm (hg-fetch): Replace guile-zlib with guile-lzlib.
>> * guix/android-repo-download.scm (android-repo-fetch): Add guile-lzlib for
>> download-nar
>
> LGTM!

Great :) I pushed this to master yesterday as
b59f89cf18fbad9ee95521c4cadc6642c580feb8.

> As a second step, we could add support for zstd/gzip (via
> guile-{zlib,zstd}) since that comes almost for free due to the fact that
> the interface is the same in all three compression libraries.  That will
> make it more future-proof.

Indeed, that should be easier now.

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