Make @nix json structured build log parsing warn instead of fail #11921
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−37
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Before this change, expressions like:
with import <nixpkgs> {};
runCommand "foo" {} ''
echo '@nix {}' >&$NIX_LOG_FD
''
would result in Lix crashing, because accessing nonexistent fields of
a JSON object throws an exception.
Rather than handling each field individually, we just catch JSON
exceptions wholesale. Since these log messages are an unusual
circumstance, log a warning when this happens.
Fixes #544.
Change-Id: Idc2d8acf6e37046b3ec212f42e29269163dca893
(cherry picked from commit e55cd3beea710db727fd966f265a1b715b7285f3)
roberth
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Motivation
A build may log with
@nix somethingwithout the intent to write Nix structured logs, resulting in an obscure error.This makes it easy to understand and continues the build.
Example:
Context
Cherry-picked from https://gerrit.lix.systems/c/lix/+/2057
Author @lheckemann
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