From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?UTF-8?Q?Court=C3=A8s?=)
Subject: bug#22745: guix http downloads don't resume
Date: Fri, 25 Mar 2016 09:35:12 +0100
Message-ID: <87poujt0ov.fsf@gnu.org>
References: <20160220093445.45cd64d2@scratchpost.org>
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To: Danny Milosavljevic <dannym@scratchpost.org>
Cc: 22745@debbugs.gnu.org

Danny Milosavljevic <dannym@scratchpost.org> skribis:

> By now, guix reconfigure has tried to download the same texlive binary fr=
om hydra at least 5 times to the same machine, unsuccessfully breaking afte=
r about 1 GB each, for a total of 5 GB, always starting from the beginning.
>
> Would it be possible to just resume?

There does not seem to be an easy way to achieve this.

> Additionally, it doesn't seem like it checks the Content-Length in order =
to find out whether the connection broke before the file was done. Why does=
n't it?

For archives (the /nar/foo URLs), there is currently no =E2=80=98Content-Le=
ngth=E2=80=99
header at all (this is because Hydra, the software, generates those
files on the fly; we should tweak nginx to add a =E2=80=98Content-Length=E2=
=80=99
header, but this seems to require an external nginx plugin.)

However, the {mirror.,}hydra.gnu.org use chunked encoding, indeed, which
allows the HTTP client to detect truncated transfers.

Ludo=E2=80=99.