From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?UTF-8?Q?Court=C3=A8s?=)
Subject: bug#20067: fix interpretation of grub configuration
Date: Tue, 23 Feb 2016 14:45:36 +0100
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References: <20150309203443.GA3438@venom>
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Tom=C3=A1=C5=A1 =C4=8Cech <sleep_walker@suse.cz> skribis:

> Grub configuration interpretes `linux' as directory where is located
> bzImage. If I enter file name instead, result configuration will be
> wrong.

The solution will be to not automatically append =E2=80=9C/bzImage=E2=80=9D=
 (and
likewise for the initrd.)

We could change places where =E2=80=98menu-entry=E2=80=99 is instantiated t=
o:

  #~(string-append #$kernel "/bzImage")

However, there=E2=80=99s the problem that the image name appears in the
=E2=80=98parameters=E2=80=99 file of the system (as seen in the output of =
=E2=80=98guix system
build foo.scm=E2=80=99), where it is unevaluated.  If we use =E2=80=98strin=
g-append=E2=80=99 as
above, a raw (string-append =E2=80=A6) sexp will appear in there, which is =
not
nice.

To address this, an idea is to add =E2=80=9Cexpanders=E2=80=9D for gexps: g=
exps already
have =E2=80=9Ccompilers=E2=80=9D, and expanders would be similar except tha=
t they would
produce something possibly different from just the derivation=E2=80=99s out=
put
file name.  For instance, we could write:

  (file-append kernel "/bzImage")

and that would expand directly to:

  "/gnu/store/=E2=80=A6/bzImage"

Ludo=E2=80=99.