From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Re: =?utf-8?Q?=E2=80=98guix_archive=E2=80=99_doesn=E2=80=99t?= work
	over =?utf-8?Q?=E2=80=98=2E=2Fpre-inst-env=E2=80=99?=
Date: Sun, 26 Jan 2014 15:52:16 +0100
Message-ID: <87eh3ure1r.fsf@gnu.org>
References: <87txcqesqv.fsf@karetnikov.org>
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In-Reply-To: <87txcqesqv.fsf@karetnikov.org> (Nikita Karetnikov's message of
	"Sun, 26 Jan 2014 18:13:12 +0400")
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To: Nikita Karetnikov <nikita@karetnikov.org>
Cc: guix-devel@gnu.org

Nikita Karetnikov <nikita@karetnikov.org> skribis:

> $ sudo ./pre-inst-env guix archive --generate-key
> $ ./pre-inst-env guix archive --export hello > hello.nar
> error: executing `guix-authenticate': No such file or directory
> guix archive: error: build failed: program `guix-authenticate' failed wit=
h exit code 1
>
> The command succeeded when I installed Guix and re-ran it without
> =E2=80=98./pre-inst-env=E2=80=99.

Indeed.  I just fixed that.

> Slightly off-topic: is Hydra supposed to do the same when someone
> requests a substitute?

It=E2=80=99s supposed to do something equivalent, yes (specifically, it use=
s a
Nix command-line client tool which calls the =E2=80=98export-paths=E2=80=99=
 RPC, which
then calls =E2=80=98guix authenticate=E2=80=99 to create the signature.)

However, note that hydra.gnu.org runs an older version of Hydra that
lacks support for that.  We can upgrade it when needed.

> Also, where can I find the corresponding NAR info file?  According to
> this commit [1], the signature should be there.

The .narinfo files are created on the fly.  When looking for a binary
for /nix/store/x4mnd9747fgwacjrvl1rynh59qlgz8gh-coreutils-8.21, the
substituter attempts to fetch:

  http://hydra.gnu.org/x4mnd9747fgwacjrvl1rynh59qlgz8gh.narinfo

It caches the answer (positive or negative) under
/nix/var/nix/substitute-binary/cache/x4mnd9747fgwacjrvl1rynh59qlgz8gh
(or similar.)

HTH,
Ludo=E2=80=99.