From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@gnu.org>
Subject: bug#39575: guix time-machine fails when a tarball was modified
 in-place
Date: Thu, 13 Feb 2020 22:34:21 +0100
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To: Jan Nieuwenhuizen <janneke@gnu.org>
Cc: 39575@debbugs.gnu.org

Hi,

Jan Nieuwenhuizen <janneke@gnu.org> skribis:

> building /gnu/store/cjim33x0q1bv1ppkv3qijvr1pvsn4y0q-harfbuzz-2.4.0.tar.b=
z2.drv...
> downloading from https://www.freedesktop.org/software/harfbuzz/release/ha=
rfbuzz-2.4.0.tar.bz2...
> |offloading build of /gnu/store/6fgg1irkcvqyb4f9f8n0nzi5gknyqhfn-gcc-mesb=
oot1-4.7.4.drv to 'kluit.dezyne.org'
> - 'build' phasesha256 hash mismatch for /gnu/store/b4cdp9sp44848348lrpzbf=
afhmjqf8nr-harfbuzz-2.4.0.tar.bz2:
>   expected hash: 1mpah6kwqid1kxsj4rwqsniivqbrx231j65v51yncx6s0dch0dch
>   actual hash:   0vrkvdlmihdg62a4c6h5kx27khc33xmb95l50zgnwnavvpwyyw5l
> hash mismatch for store item '/gnu/store/b4cdp9sp44848348lrpzbfafhmjqf8nr=
-harfbuzz-2.4.0.tar.bz2'

The problem here is really that we fall back to content-addressed
mirrors instead of using them directly:

  https://issues.guix.gnu.org/issue/28659

The file itself is still available on our machines though, and you can
get it with:

  guix download -o harfbuzz-2.4.0.tar.bz2 \
  https://ci.guix.gnu.org/file/harfbuzz-2.4.0.tar.bz2/sha256/0vrkvdlmihdg62=
a4c6h5kx27khc33xmb95l50zgnwnavvpwyyw5l

  guix download file://$PWD/harfbuzz-2.4.0.tar.bz2

After that, re-running =E2=80=98guix time-machine=E2=80=99 should work.

Using ci.guix.gnu.org for substitutes should have the same effect.

HTH,
Ludo=E2=80=99.