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Subject: bug#35751: "guix environment -s" doesn't set %current-system in gnu/packages
Resent-From: Danny Milosavljevic <dannym@HIDDEN>
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Date: Wed, 15 May 2019 17:32:11 +0200
From: Danny Milosavljevic <dannym@HIDDEN>
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Hi,

when doing "guix environment -s armhf-linux", apparently it doesn't set
%current-system to "armhf-linux" for packages in gnu/packages at toplevel
context.

That would be convenient for development, f.e. instead of "guix build" I of=
ten
use "guix environment" inside the git checkout of the package.  In this case
it's differing.

Should it?


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To: Danny Milosavljevic <dannym@HIDDEN>
Subject: bug#35751: Acknowledgement ("guix environment -s" doesn't set
 %current-system in gnu/packages)
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Date: Wed, 15 May 2019 15:33:02 +0000

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Message sent to bug-guix@HIDDEN:

Subject: bug#35751: "guix environment -s" doesn't set %current-system in gnu/packages
Resent-From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
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To: Danny Milosavljevic <dannym@HIDDEN>
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From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
References: <20190515173211.5b394c1c@HIDDEN>
Date: Sat, 18 May 2019 19:19:40 +0200
In-Reply-To: <20190515173211.5b394c1c@HIDDEN> (Danny Milosavljevic's
 message of "Wed, 15 May 2019 17:32:11 +0200")
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Hi Danny,

Danny Milosavljevic <dannym@HIDDEN> skribis:

> when doing "guix environment -s armhf-linux", apparently it doesn't set
> %current-system to "armhf-linux" for packages in gnu/packages at toplevel
> context.

Correct.  That=E2=80=99s the way it=E2=80=99s meant to work: the initial va=
lue of
=E2=80=98%current-system=E2=80=99 when files get loaded should not matter.

> That would be convenient for development, f.e. instead of "guix build" I =
often
> use "guix environment" inside the git checkout of the package.  In this c=
ase
> it's differing.

Package definitions should refer to =E2=80=98%current-system=E2=80=99 only =
from within
the dynamic extent of a thunked field.

For example, if a package refers to =E2=80=98%current-system=E2=80=99 from =
=E2=80=98arguments=E2=80=99,
or from a procedure called from =E2=80=98arguments=E2=80=99, everything is =
fine:
=E2=80=98%current-system=E2=80=99, at that point, will be bound to whatever=
 was selected
with =E2=80=98-s=E2=80=99.

Does that make sense?

Thanks,
Ludo=E2=80=99.

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