From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christopher Baines <mail@cbaines.net>
Subject: Re: What is wrong with these few lines of guile code?
Date: Tue, 31 Oct 2017 17:50:28 +0000
Message-ID: <20171031175028.71f40cc5@cbaines.net>
References: <a11d7a2e-35ff-1333-9238-c332c6d8d163@crazy-compilers.com>
Mime-Version: 1.0
Content-Type: multipart/signed; micalg=pgp-sha512;
	boundary="Sig_/x77oGJXQAU/HvAi4C43jGH=";
	protocol="application/pgp-signature"
Return-path: <guix-devel-bounces+gcggd-guix-devel=m.gmane.org@gnu.org>
Received: from eggs.gnu.org ([2001:4830:134:3::10]:48899)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <mail@cbaines.net>) id 1e9agU-0005WS-Rg
	for guix-devel@gnu.org; Tue, 31 Oct 2017 13:50:43 -0400
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <mail@cbaines.net>) id 1e9agR-0003wD-O9
	for guix-devel@gnu.org; Tue, 31 Oct 2017 13:50:42 -0400
Received: from mira.cbaines.net ([2a01:7e00::f03c:91ff:fe69:8da9]:53066)
	by eggs.gnu.org with esmtp (Exim 4.71)
	(envelope-from <mail@cbaines.net>) id 1e9agR-0003vp-Fj
	for guix-devel@gnu.org; Tue, 31 Oct 2017 13:50:39 -0400
In-Reply-To: <a11d7a2e-35ff-1333-9238-c332c6d8d163@crazy-compilers.com>
List-Id: "Development of GNU Guix and the GNU System distribution."
	<guix-devel.gnu.org>
List-Unsubscribe: <https://lists.gnu.org/mailman/options/guix-devel>,
	<mailto:guix-devel-request@gnu.org?subject=unsubscribe>
List-Archive: <http://lists.gnu.org/archive/html/guix-devel/>
List-Post: <mailto:guix-devel@gnu.org>
List-Help: <mailto:guix-devel-request@gnu.org?subject=help>
List-Subscribe: <https://lists.gnu.org/mailman/listinfo/guix-devel>,
	<mailto:guix-devel-request@gnu.org?subject=subscribe>
Errors-To: guix-devel-bounces+gcggd-guix-devel=m.gmane.org@gnu.org
Sender: "Guix-devel" <guix-devel-bounces+gcggd-guix-devel=m.gmane.org@gnu.org>
To: Hartmut Goebel <h.goebel@crazy-compilers.com>
Cc: guix-devel <guix-devel@gnu.org>

--Sig_/x77oGJXQAU/HvAi4C43jGH=
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

On Tue, 31 Oct 2017 14:41:46 +0100
Hartmut Goebel <h.goebel@crazy-compilers.com> wrote:

> Hallo,
>=20
> i replaced the code of gnu/system/install.scm(make-cow-store target) [1]
> with the code below. Now when running this code (which is triggered by
> "herd start cow-store /mnt" in the installation-os)|I get this error:
> |
>=20
> herd: exception caught while executing 'start' on service 'cow-store':
> ERROR: Unbound variable: gexp
>=20
> What is wrong with this code? (Parentheses are matching, of course :-)

...

> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ;; Mount the overlay, then ato=
mically make it the store.
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 (mount "none" "/.rw-store" "ov=
erlay"
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 (string-append "lowerdir=3D" #$(%store-prefix)
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0 "upperdir=3D" #~rw-dir ","
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0 "workdir=3D" #~work-dir))

Here, as rw-dir and work-dir are just inside the gexp, you don't need
to ungexp, or gexp them (as is being done here), so I'd remove the #~.

This matches the error you're getting, as #~ is short for (gexp ...) as
I understand it.

> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 (mount "/.rw-store" #$(%store-=
prefix) "" MS_MOVE)
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 (rmdir "/.rw-store"))))
>=20


--Sig_/x77oGJXQAU/HvAi4C43jGH=
Content-Type: application/pgp-signature
Content-Description: OpenPGP digital signature

-----BEGIN PGP SIGNATURE-----
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=Sc0N
-----END PGP SIGNATURE-----

--Sig_/x77oGJXQAU/HvAi4C43jGH=--