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Subject: bug#29200: `guix build --fallback` does not work with offloading
Resent-From: Marius Bakke <mbakke@HIDDEN>
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Hello!

I've noticed that when offloading, --fallback sometimes fails to
actually fall back.  Here is a shell transcript:

=2D-8<---------------cut here---------------start------------->8---
$ ./pre-inst-env guix build --substitute-urls=3D"https://mirror.hydra.gnu.o=
rg" --fallback font-arabic-misc
@ substituter-started /gnu/store/26nk7rgc2rhi7v0d8xhqqxglpg532syh-font-arab=
ic-misc-1.0.3.tar.xz /gnu/store/19wpps1nmlg4j1530knl7kdhvgcmj5fc-guix-0.13.=
0-8.357ab93/libexec/guix/substitute
Downloading https://mirror.hydra.gnu.org/guix/nar/26nk7rgc2rhi7v0d8xhqqxglp=
g532syh-font-arabic-misc-1.0.3.tar.xz...
guix substitute: error: download from 'https://mirror.hydra.gnu.org/guix/na=
r/26nk7rgc2rhi7v0d8xhqqxglpg532syh-font-arabic-misc-1.0.3.tar.xz' failed: 4=
04, "Not Found"
@ substituter-failed /gnu/store/26nk7rgc2rhi7v0d8xhqqxglpg532syh-font-arabi=
c-misc-1.0.3.tar.xz 256 fetching path `/gnu/store/26nk7rgc2rhi7v0d8xhqqxglp=
g532syh-font-arabic-misc-1.0.3.tar.xz' failed with exit code 1
process 8395 acquired build slot '/var/guix/offload/192.168.2.11/0'
process 8395 acquired build slot '/var/guix/offload/192.168.2.5/0'
load on machine '192.168.2.11' is 0.08 (normalized: 0.02)
@ build-started /gnu/store/rqgfr39aamfzqq93fl87ai2y61b5s992-font-arabic-mis=
c-1.0.3.tar.xz.drv - x86_64-linux /var/log/guix/drvs/rq//gfr39aamfzqq93fl87=
ai2y61b5s992-font-arabic-misc-1.0.3.tar.xz.drv.bz2
sending 0 store items to '192.168.2.11'...
offloading '/gnu/store/rqgfr39aamfzqq93fl87ai2y61b5s992-font-arabic-misc-1.=
0.3.tar.xz.drv' to '192.168.2.11'...
@ build-remote /gnu/store/rqgfr39aamfzqq93fl87ai2y61b5s992-font-arabic-misc=
-1.0.3.tar.xz.drv 192.168.2.11
@ substituter-started /gnu/store/26nk7rgc2rhi7v0d8xhqqxglpg532syh-font-arab=
ic-misc-1.0.3.tar.xz /gnu/store/19wpps1nmlg4j1530knl7kdhvgcmj5fc-guix-0.13.=
0-8.357ab93/libexec/guix/substitute
Downloading https://mirror.hydra.gnu.org/guix/nar/26nk7rgc2rhi7v0d8xhqqxglp=
g532syh-font-arabic-misc-1.0.3.tar.xz...
guix substitute: error: download from 'https://mirror.hydra.gnu.org/guix/na=
r/26nk7rgc2rhi7v0d8xhqqxglpg532syh-font-arabic-misc-1.0.3.tar.xz' failed: 4=
04, "Not Found"
@ substituter-failed /gnu/store/26nk7rgc2rhi7v0d8xhqqxglpg532syh-font-arabi=
c-misc-1.0.3.tar.xz 256 fetching path `/gnu/store/26nk7rgc2rhi7v0d8xhqqxglp=
g532syh-font-arabic-misc-1.0.3.tar.xz' failed with exit code 1
derivation '/gnu/store/rqgfr39aamfzqq93fl87ai2y61b5s992-font-arabic-misc-1.=
0.3.tar.xz.drv' offloaded to '192.168.2.11' failed: some substitutes for th=
e outputs of derivation `/gnu/store/rqgfr39aamfzqq93fl87ai2y61b5s992-font-a=
rabic-misc-1.0.3.tar.xz.drv' failed (usually happens due to networking issu=
es); try `--fallback' to build derivation from source=20
@ build-failed /gnu/store/rqgfr39aamfzqq93fl87ai2y61b5s992-font-arabic-misc=
-1.0.3.tar.xz.drv - 1 builder for `/gnu/store/rqgfr39aamfzqq93fl87ai2y61b5s=
992-font-arabic-misc-1.0.3.tar.xz.drv' failed with exit code 100
cannot build derivation `/gnu/store/gna22xl7ycq4rzaj487axa5ijbyhqq1q-font-a=
rabic-misc-1.0.3.drv': 1 dependencies couldn't be built
guix build: error: build failed: build of `/gnu/store/gna22xl7ycq4rzaj487ax=
a5ijbyhqq1q-font-arabic-misc-1.0.3.drv' failed
=2D-8<---------------cut here---------------end--------------->8---

Passing --no-build-hook makes it succeed:

=2D-8<---------------cut here---------------start------------->8---
$ ./pre-inst-env guix build --substitute-urls=3D"https://mirror.hydra.gnu.o=
rg" --fallback --no-build-hook font-arabic-misc
@ substituter-started /gnu/store/26nk7rgc2rhi7v0d8xhqqxglpg532syh-font-arab=
ic-misc-1.0.3.tar.xz /gnu/store/19wpps1nmlg4j1530knl7kdhvgcmj5fc-guix-0.13.=
0-8.357ab93/libexec/guix/substitute=20=20=20=20=20=20=20=20=20=20=20=20=20
Downloading https://mirror.hydra.gnu.org/guix/nar/26nk7rgc2rhi7v0d8xhqqxglp=
g532syh-font-arabic-misc-1.0.3.tar.xz...=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20
guix substitute: error: download from 'https://mirror.hydra.gnu.org/guix/na=
r/26nk7rgc2rhi7v0d8xhqqxglpg532syh-font-arabic-misc-1.0.3.tar.xz' failed: 4=
04, "Not Found"
@ substituter-failed /gnu/store/26nk7rgc2rhi7v0d8xhqqxglpg532syh-font-arabi=
c-misc-1.0.3.tar.xz 256 fetching path `/gnu/store/26nk7rgc2rhi7v0d8xhqqxglp=
g532syh-font-arabic-misc-1.0.3.tar.xz' failed with exit code 1
@ build-started /gnu/store/rqgfr39aamfzqq93fl87ai2y61b5s992-font-arabic-mis=
c-1.0.3.tar.xz.drv - x86_64-linux /var/log/guix/drvs/rq//gfr39aamfzqq93fl87=
ai2y61b5s992-font-arabic-misc-1.0.3.tar.xz.drv.bz2
font-arabic-misc-1.0.3/
font-arabic-misc-1.0.3/arabic24.bdf
font-arabic-misc-1.0.3/aclocal.m4
[...]
=2D-8<---------------cut here---------------end--------------->8---

Interestingly no download was done on the second try, so apparently the
source was already in my store.

It looks like the offload hook starts before the actual download
(possibly because a substitute was advertised), and then fails when the
substitute 404s.

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Marius Bakke <mbakke@HIDDEN>
Subject: bug#29200: Acknowledgement (`guix build --fallback` does not work
 with offloading)
Message-ID: <handler.29200.B.15100934606785.ack <at> debbugs.gnu.org>
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Date: Tue, 07 Nov 2017 22:25:02 +0000

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Message sent to bug-guix@HIDDEN:

Subject: bug#29200: `guix build --fallback` does not work with offloading
Resent-From: ludo@HIDDEN (Ludovic =?UTF-8?Q?Court=C3=A8s?=)
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From: ludo@HIDDEN (Ludovic =?UTF-8?Q?Court=C3=A8s?=)
References: <878tfh3eym.fsf@HIDDEN>
Date: Wed, 08 Nov 2017 09:53:14 +0100
In-Reply-To: <878tfh3eym.fsf@HIDDEN> (Marius Bakke's message of "Tue, 07
 Nov 2017 23:24:01 +0100")
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Marius Bakke <mbakke@HIDDEN> skribis:

> I've noticed that when offloading, --fallback sometimes fails to
> actually fall back.  Here is a shell transcript:

The problem is that guix-daemon does not pass =E2=80=9Cfallbackness=E2=80=
=9D settings to
=E2=80=98guix offload=E2=80=99 (you can check (guix scripts offload) to see=
 what
settings are passed.)

We should adjust guix-daemon and (guix scripts offload) to pass this
extra setting, though there are probably other bits missing.

Thanks,
Ludo=E2=80=99.

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