From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Re: Invalid nar signature
Date: Tue, 16 Dec 2014 18:07:10 +0100
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	(David Thompson's message of "Mon, 15 Dec 2014 17:49:53 -0500")
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To: David Thompson <dthompson2@worcester.edu>
Cc: guix-devel <guix-devel@gnu.org>

David Thompson <dthompson2@worcester.edu> skribis:

> Ludovic Court=C3=A8s <ludo@gnu.org> writes:
>
>> To produce that, use =E2=80=98write-file=E2=80=99 from (guix serializati=
on):
>>
>> --8<---------------cut here---------------start------------->8---
>> $ ./pre-inst-env guile -c '(use-modules (guix serialization)) (write-fil=
e "/gnu/store/wy70n5zk8qinxjz0wdk9q2hh1zjfb32j-miscfiles-1.5" (current-outp=
ut-port))' > t.nar
>> $ ./pre-inst-env guile -c '(use-modules (guix serialization)) (call-with=
-input-file "t.nar" (lambda (port) (restore-file port "restored")))'
>> $ ls restored/
>> share
>> --8<---------------cut here---------------end--------------->8---
>
> The above snippet works.  However, 'guix substitute-binary' throws the
> following error:
>
>   guix substitute-binary: error: invalid nar end-of-file marker
>
> Here's my nar rendering code:
>
>   (define (render-nar store-item)
>     "Render archive of the store path corresponding to STORE-ITEM."
>     (let ((store-path (string-append %store-directory "/" store-item)))
>       (values '((content-type . (text/x-nix-archive)))
>               (lambda (port)
>                 (write-file store-path port)))))

Hmm, some ideas of things to try:

  1. Add (force-output port) after (write-file ...).

  2. Display the value of =E2=80=98x=E2=80=99 in =E2=80=98restore-file=E2=
=80=99 at the point where the
     exception is raised.

  2. strace the substituter and/or =E2=80=98guix publish=E2=80=99 to see ex=
actly what
     happens on the wire.  Is the end-of-file marker string sent?  Is it
     received?  etc.

Ludo=E2=80=99.