Ludovic Courtès <ludo@HIDDEN>
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From: Simon Tournier <zimon.toutoune@HIDDEN>
To: 70588 <at> debbugs.gnu.org
Subject: Re: bug#70588: hash mismatch error and stop fallback
In-Reply-To: <87ttjpinb8.fsf@HIDDEN> (Simon Tournier's message of "Thu, 25
Apr 2024 15:28:27 +0200")
References: <87ttjpinb8.fsf@HIDDEN>
Date: Fri, 03 May 2024 19:53:39 +0200
Message-ID: <878r0qkcik.fsf@HIDDEN>
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Hi,
On lun., 02 oct. 2017 at 17:09, ludo@HIDDEN (Ludovic Court=C3=A8s) wrote:
> The problem is that the hash check is performed by guix-daemon itself,
> not by =E2=80=9Cguix perform-download=E2=80=9D. So when guix-daemon diag=
noses a hash
> mismatch, it=E2=80=99s too late and we cannot try again and use the
> content-addressed mirror.
This quote from [1]. Well, why not run a sequence of =E2=80=9Cguix downloa=
d=E2=80=9D
then =E2=80=9Cguix build=E2=80=9D? Ah the store item would be hashed twice=
. Let try to
avoid this sub-optimized behaviour.
The only way to avoid hashing twice is to extend the protocol of
guix-daemon. Because currently it reads,
/* Check the hash. */
Hash h2 =3D recursive ? hashPath(ht, actualPath).first : hashFi=
le(ht, actualPath);
if (h !=3D h2) {
if (settings.printBuildTrace)
printMsg(lvlError, format("@ hash-mismatch %1% %2% %3% %4%")
% path % i->second.hashAlgo
% printHash16or32(h) % printHash16or32(h2));
throw BuildError(format("hash mismatch for store item '%1%'=
") % path);
}
with the call under error catch:
/* Compute the FS closure of the outputs and register them as
being valid. */
registerOutputs();
[...]
} catch (BuildError & e) {
Thus the number of solutions is very limited. :-)
Well, from my understanding, moving elsewhere in guix-daemon the check
of the hash appears to me too cumbersome. Therefore, the only way is to
replace this =E2=80=99BuildError=E2=80=99 by something that is not an error=
and do not
register the item.
Easier to say than to implement. Again from my understanding, each
strategy for downloading is seen by the daemon as an element of a list
of independent builds and these elements are tried in sequence.
Therefore, we need to special case in order to be able to distinguish
different kind of failures.
All in all, this bug (missing feature):
Other said, hash mismatch should be raised and obviously the content
must be discarded; then the hash mismatch should be considered as =
=E2=80=9Cnot
found=E2=80=9D so let try the next strategy for downloading the con=
tent.
is not straightforward to fix. :-) Need for more thought=E2=80=A6
Cheers,
simon
1: bug#28659: v0.13: guix pull fails; libgit2-0.26.0 and 0.25.1 content has=
hes fail
ludo@HIDDEN (Ludovic Court=C3=A8s)
Mon, 02 Oct 2017 17:09:39 +0200
id:87o9ppoabw.fsf@HIDDEN
https://issues.guix.gnu.org/28659
https://issues.guix.gnu.org/msgid/87o9ppoabw.fsf@HIDDEN
https://yhetil.org/guix/87o9ppoabw.fsf@HIDDEN
bug-guix@HIDDEN:bug#70588; Package guix.
Full text available.Ludovic Courtès <ludo@HIDDEN>
to control <at> debbugs.gnu.org.
Full text available.Ludovic Courtès <ludo@HIDDEN>
to control <at> debbugs.gnu.org.
Full text available.Received: (at 70588) by debbugs.gnu.org; 1 May 2024 10:37:00 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Wed May 01 06:37:00 2024 Received: from localhost ([127.0.0.1]:36687 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1s27Ke-0004wp-0F for submit <at> debbugs.gnu.org; Wed, 01 May 2024 06:37:00 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:33970) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <ludo@HIDDEN>) id 1s27Kc-0004we-1D for 70588 <at> debbugs.gnu.org; Wed, 01 May 2024 06:36:58 -0400 Received: from fencepost.gnu.org ([2001:470:142:3::e]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from <ludo@HIDDEN>) id 1s27KA-0005tj-Ie; Wed, 01 May 2024 06:36:31 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=gnu.org; s=fencepost-gnu-org; h=MIME-Version:Date:References:In-Reply-To:Subject:To: From; bh=td2DmPGd5vgF4v1vvrwWSDtM/nVtq/xB9Qpdi7M4k1s=; b=aX+GQT9ZNdepY1lWzSED tmku/6WCUZSHNH6ypGTUpZ78+ZXLO60mWXq/9A7w0hTCrPUdHwec/4XdV7vf2wgDBwKAYiiHt0rDi SY0xwNLNv1mxG6Q+l4eCyYemywL6ZK1FF9EKcRaiCwZml6501ITb9LjWm2hz9FrPeL7vmhauFz9GD aMNleBAzQEsd5DidmrM199U+yzRXO3AWS6vJ1RZXVoivKXxWmTkmGnj4dGQ8s41eIEkO2ZRinl5Wf 7xxjVNVpdlQMR+VelAWQXwKIPyA3tPQGYaDf+mHbkNG7defC8Qs5DNHrnRUwgvtXBo/Wj73C73fCZ ybfed59GyLgh5A==; From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN> To: Simon Tournier <zimon.toutoune@HIDDEN> Subject: Re: bug#70588: hash mismatch error and stop fallback In-Reply-To: <87ttjpinb8.fsf@HIDDEN> (Simon Tournier's message of "Thu, 25 Apr 2024 15:28:27 +0200") References: <87ttjpinb8.fsf@HIDDEN> Date: Wed, 01 May 2024 12:36:27 +0200 Message-ID: <87h6fh7r9w.fsf@HIDDEN> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Spam-Score: -2.3 (--) X-Debbugs-Envelope-To: 70588 Cc: 70588 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -3.3 (---) Hi, Simon Tournier <zimon.toutoune@HIDDEN> skribis: > Other said, hash mismatch should be raised and obviously the content > must be discarded; then the hash mismatch should be considered as =E2=80= =9Cnot > found=E2=80=9D so let try the next strategy for downloading the content. Agreed. I merged it with <https://issues.guix.gnu.org/28659>. Thanks, Ludo=E2=80=99.
bug-guix@HIDDEN:bug#70588; Package guix.
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From: Simon Tournier <zimon.toutoune@HIDDEN>
To: bug-guix@HIDDEN
Subject: hash mismatch error and stop fallback
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Content preview: Hi, Considering something from the past – well to my knowledge
it is still an issue with the current implementation and such it will be
a issue for the future. ;-) For instance, the R package MASS from 2019 (Guix
revision 711cec): because the CRAN project did some in-place replacements,
we have a hash mismatch and all the process stops.
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Hi,
Considering something from the past =E2=80=93 well to my knowledge it is st=
ill
an issue with the current implementation and such it will be a issue for
the future. ;-)
For instance, the R package MASS from 2019 (Guix revision 711cec):
because the CRAN project did some in-place replacements, we have a hash
mismatch and all the process stops.
--8<---------------cut here---------------start------------->8---
$ guix build /gnu/store/wfq2ji5x9awgyk680i1vv95hq75nx3vv-MASS_7.3-51.4.tar.=
gz.drv
substitute: updating substitutes from 'https://ci.guix.gnu.org'... 100.0%
substitute: updating substitutes from 'https://bordeaux.guix.gnu.org'... 10=
0.0%
The following derivation will be built:
/gnu/store/wfq2ji5x9awgyk680i1vv95hq75nx3vv-MASS_7.3-51.4.tar.gz.drv
building /gnu/store/wfq2ji5x9awgyk680i1vv95hq75nx3vv-MASS_7.3-51.4.tar.gz.d=
rv...
Starting download of /gnu/store/gxbam95zqjaxdd6303j97z4djr907yzn-MASS_7.3-5=
1.4.tar.gz
From http://cran.r-project.org/src/contrib/MASS_7.3-51.4.tar.gz...
download failed "http://cran.r-project.org/src/contrib/MASS_7.3-51.4.tar.gz=
" 404 "Not Found"
Starting download of /gnu/store/gxbam95zqjaxdd6303j97z4djr907yzn-MASS_7.3-5=
1.4.tar.gz
From http://cran.rstudio.com/src/contrib/MASS_7.3-51.4.tar.gz...
download failed "http://cran.rstudio.com/src/contrib/MASS_7.3-51.4.tar.gz" =
404 "Not Found"
Starting download of /gnu/store/gxbam95zqjaxdd6303j97z4djr907yzn-MASS_7.3-5=
1.4.tar.gz
From http://cran.univ-lyon1.fr/src/contrib/MASS_7.3-51.4.tar.gz...
following redirection to `https://pbil.univ-lyon1.fr/CRAN/src/contrib/MASS_=
7.3-51.4.tar.gz'...
download failed "https://pbil.univ-lyon1.fr/CRAN/src/contrib/MASS_7.3-51.4.=
tar.gz" 404 "Not Found"
Starting download of /gnu/store/gxbam95zqjaxdd6303j97z4djr907yzn-MASS_7.3-5=
1.4.tar.gz
From http://cran.ism.ac.jp/src/contrib/MASS_7.3-51.4.tar.gz...
download failed "http://cran.ism.ac.jp/src/contrib/MASS_7.3-51.4.tar.gz" 40=
4 "Not Found"
Starting download of /gnu/store/gxbam95zqjaxdd6303j97z4djr907yzn-MASS_7.3-5=
1.4.tar.gz
From http://cran.stat.auckland.ac.nz/src/contrib/MASS_7.3-51.4.tar.gz...
download failed "http://cran.stat.auckland.ac.nz/src/contrib/MASS_7.3-51.4.=
tar.gz" 404 "Not Found"
Starting download of /gnu/store/gxbam95zqjaxdd6303j97z4djr907yzn-MASS_7.3-5=
1.4.tar.gz
From http://cran.mirror.ac.za/src/contrib/MASS_7.3-51.4.tar.gz...
download failed "http://cran.mirror.ac.za/src/contrib/MASS_7.3-51.4.tar.gz"=
404 "Not Found"
Starting download of /gnu/store/gxbam95zqjaxdd6303j97z4djr907yzn-MASS_7.3-5=
1.4.tar.gz
From http://cran.csie.ntu.edu.tw/src/contrib/MASS_7.3-51.4.tar.gz...
download failed "http://cran.csie.ntu.edu.tw/src/contrib/MASS_7.3-51.4.tar.=
gz" 404 "Not Found"
Starting download of /gnu/store/gxbam95zqjaxdd6303j97z4djr907yzn-MASS_7.3-5=
1.4.tar.gz
From http://cran.r-project.org/src/contrib/Archive/MASS/MASS_7.3-51.4.tar.g=
z...
downloading from http://cran.r-project.org/src/contrib/Archive/MASS/MASS_7.=
3-51.4.tar.gz ...
MASS_7.3-51.4.tar.gz 476KiB 2.1MiB/s 00:00 =E2=96=95=E2=96=88=E2=
=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=
=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=
=E2=96=8F 100.0%
sha256 hash mismatch for /gnu/store/gxbam95zqjaxdd6303j97z4djr907yzn-MASS_7=
.3-51.4.tar.gz:
expected hash: 0x1ckf51y851g0kvbhsgdxb26vfpmbw3xdbcnh3ck7fjm13da4cr
actual hash: 1swfd4jnqhsb2imznib629bywrxah7b63yqxhwhd9bhyaji70hl4
hash mismatch for store item '/gnu/store/gxbam95zqjaxdd6303j97z4djr907yzn-M=
ASS_7.3-51.4.tar.gz'
build of /gnu/store/wfq2ji5x9awgyk680i1vv95hq75nx3vv-MASS_7.3-51.4.tar.gz.d=
rv failed
View build log at '/var/log/guix/drvs/wf/q2ji5x9awgyk680i1vv95hq75nx3vv-MAS=
S_7.3-51.4.tar.gz.drv.gz'.
guix build: error: build of `/gnu/store/wfq2ji5x9awgyk680i1vv95hq75nx3vv-MA=
SS_7.3-51.4.tar.gz.drv' failed
--8<---------------cut here---------------end--------------->8---
When the source is correctly available in SWH:
--8<---------------cut here---------------start------------->8---
$ guix build /gnu/store/wfq2ji5x9awgyk680i1vv95hq75nx3vv-MASS_7.3-51.4.tar.=
gz.drv
The following derivation will be built:
/gnu/store/wfq2ji5x9awgyk680i1vv95hq75nx3vv-MASS_7.3-51.4.tar.gz.drv
building /gnu/store/wfq2ji5x9awgyk680i1vv95hq75nx3vv-MASS_7.3-51.4.tar.gz.d=
rv...
[...]
Starting download of /gnu/store/gxbam95zqjaxdd6303j97z4djr907yzn-MASS_7.3-5=
1.4.tar.gz
From https://archive.softwareheritage.org/api/1/content/sha256:9911d546a8d2=
9dc906b46cb53ef8aad76d23566f4fc3b52778a1201f8a9b2c74/raw/...
downloading from https://archive.softwareheritage.org/api/1/content/sha256:=
9911d546a8d29dc906b46cb53ef8aad76d23566f4fc3b52778a1201f8a9b2c74/raw/ ...
raw/ 476KiB 9.9MiB/s 00:00 =E2=96=95=E2=96=88=E2=
=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=
=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=
=E2=96=8F 100.0%
successfully built /gnu/store/wfq2ji5x9awgyk680i1vv95hq75nx3vv-MASS_7.3-51.=
4.tar.gz.drv
/gnu/store/gxbam95zqjaxdd6303j97z4djr907yzn-MASS_7.3-51.4.tar.gz
$ guix hash /gnu/store/gxbam95zqjaxdd6303j97z4djr907yzn-MASS_7.3-51.4.tar.gz
0x1ckf51y851g0kvbhsgdxb26vfpmbw3xdbcnh3ck7fjm13da4cr
--8<---------------cut here---------------end--------------->8---
Therefore, the bug is to not consider a hash mismatch as a fullstop and
error out but consider it as a failure of one strategy and thus try the
next strategy.
Other said, hash mismatch should be raised and obviously the content
must be discarded; then the hash mismatch should be considered as =E2=80=9C=
not
found=E2=80=9D so let try the next strategy for downloading the content.
Cheers,
simon
Simon Tournier <zimon.toutoune@HIDDEN>:ludo@HIDDEN, bug-guix@HIDDEN.
Full text available.ludo@HIDDEN, bug-guix@HIDDEN:bug#70588; Package guix.
Full text available.
GNU bug tracking system
Copyright (C) 1999 Darren O. Benham,
1997 nCipher Corporation Ltd,
1994-97 Ian Jackson.