bug#46362: got unexpected path `Backtrace:' from substituter

["Ludovic Courtès" <ludo@gnu.org>]

Ludovic Courtès <ludo@gnu.org> skribis:

>>From d85353dd4bfaa57a7d5803dade91d806a169295a Mon Sep 17 00:00:00 2001
> From: =?UTF-8?q?Ludovic=20Court=C3=A8s?= <ludo@gnu.org>
> Date: Tue, 6 Apr 2021 12:10:29 +0200
> Subject: [PATCH] daemon: 'guix substitute' replies on FD 4.
>
> This avoids the situation where error messages would unintentionally go
> to stderr and be wrongfully interpreted as a reply by the daemon.
>
> Fixes <https://bugs.gnu.org/46362>.
> This is a followup to ee3226e9d54891c7e696912245e4904435be191c.
>
> * guix/scripts/substitute.scm (display-narinfo-data): Add 'port'
> parameter and honor it.
> (process-query): Likewise.
> (process-substitution): Likewise.
> (%error-to-file-descriptor-4?, with-redirected-error-port): Remove.
> (%reply-file-descriptor): New variable.
> (guix-substitute): Remove use of 'with-redirected-error-port'.  Define
> 'reply-port' and pass it to 'process-query' and 'process-substitution'.
> * nix/libstore/build.cc (SubstitutionGoal::handleChildOutput): Swap
> 'builderOut' and 'fromAgent'.
> * nix/libstore/local-store.cc (LocalStore::getLineFromSubstituter):
> Likewise.
> * tests/substitute.scm <top level>: Set '%reply-file-descriptor'
> rather than '%error-to-file-descriptor-4?'.
> ---
>  guix/scripts/substitute.scm | 183 +++++++++++++++++-------------------
>  nix/libstore/build.cc       |   4 +-
>  nix/libstore/local-store.cc |  12 +--
>  tests/substitute.scm        |   4 +-
>  4 files changed, 95 insertions(+), 108 deletions(-)

Pushed as 2d73086262e1fb33cd0f0f16f74a495fe06b38aa with the
corresponding ‘guix’ package update in
ec8d09ee672e0d357bb5bb597464c8b168f14bfb.

Ludo’.