From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mark H Weaver <mhw@netris.org>
Subject: bug#24703: Re: bug#24703: Store references in 8-byte chunks in
	compiled code
Date: Mon, 17 Oct 2016 05:42:04 -0400
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	Edwin"'s message of "Mon, 17 Oct 2016 10:46:59 +0300")
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To: =?UTF-8?Q?T=C3=B6r=C3=B6k?= Edwin <edwin+ml-guix@etorok.net>
Cc: 24703@debbugs.gnu.org

T=C3=B6r=C3=B6k Edwin <edwin+ml-guix@etorok.net> writes:

> On 2016-10-16 22:04, Ludovic Court=C3=A8s wrote:
>> Mark H Weaver <mhw@netris.org> skribis:
>>=20
>>> When grafting, how will we achieve confidence that we've found the
>>> correct occurrence of the last character?  I think we will have to give
>>> up our recently added feature of being able to change the version number
>>> of grafts.
>>=20
>> Wait, don=E2=80=99t jump to the conclusions.  :-)
>
> I've just encountered the same problem with fontconfig (after
> installing GuixSD, running guix pull and guix system reconfigure,
> --no-grafts was required).

Here's how to recover, for now:

  guix build --no-grafts -e '(@@ (gnu packages fontutils) fontconfig/fixed)'

> Would it be possible for the grafts to keep a symlink (somehow
> registered to be part of the grafted fontconfig so that guix gc
> doesn't remove it) instead of patching the binaries?
> /gnu/store/<old-hash>-fontconfig-2.11.94 -> /gnu/store/<grafted-hash>-fon=
tconfig-2.11.94

This would effectively mutate the store, and we must never do this.

      Mark