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Nix flakes should not cache evaluation errors #3872

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Nix flakes should not cache evaluation errors#3872
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bugerror-messagesConfusing messages and better diagnosticsflakeslanguageThe Nix expression language; parser, interpreter, primops, evaluation, etc
Milestone
flakes stabilisation
@Mic92

Description

@Mic92
Mic92
opened on Jul 28, 2020

Describe the bug

Currently error messages are only showed the first time they appear.
After that the error message looks like this:

$ sudo nixos-rebuild switch
building the system configuration...
error: --- EvalError -------------------------------------------------------------------------- nix
cached failure of attribute 'nixosConfigurations.turingmachine.config.system.build.toplevel.drvPath'

The problem is that the error message of the first time might be no longer visible,
so users would get stuck not knowing what its going on.

Steps To Reproduce

  1. Create an invalid nixos configuration i.e. add two conflicting options (but valid nix syntax)
  2. Run nixos-rebuild switch:
error: --- ThrownError --------------------------------------------------------------------------- nix
The option `system.nixos.versionSuffix' has conflicting definitions, in `<unknown-file>' and `<unknown-file>'.
(use '--show-trace' to show detailed location information)
  1. Run nixos-rebuild switch again:
building the system configuration...
error: --- EvalError -------------------------------------------------------------------------- nix
cached failure of attribute 'nixosConfigurations.turingmachine.config.system.build.toplevel.drvPath'

Expected behavior

It should not cache evaluation failures and show me the message agin

nix-env --version output

$ nix-env --version
nix-env (Nix) 2.4pre20200721_ff314f1

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    bugerror-messagesConfusing messages and better diagnosticsflakeslanguageThe Nix expression language; parser, interpreter, primops, evaluation, etc

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