From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Re: 'substitute*' fails with "string contains #\nul character"
Date: Tue, 16 Jul 2013 21:07:57 +0200
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To: Nikita Karetnikov <nikita@karetnikov.org>
Cc: guix-devel@gnu.org

Nikita Karetnikov <nikita@karetnikov.org> skribis:

> 'substitute*' fails to patch a binary and returns the following error

[...]

> ice-9/boot-9.scm:106:20: string contains #\nul character:

Yes, that is expected.  =E2=80=98substitute*=E2=80=99 is for textual files.

=E2=80=98fold-port-matches=E2=80=99 from (guix build utils) can be used for=
 binary files
(see =E2=80=98remove-store-references=E2=80=99 for an example use.)

HTH,
Ludo=E2=80=99.