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Maximilian Bosch 7c76964daa
libexpr: misc improvements for proper error position 
When working on some more complex Nix code, there are sometimes rather
unhelpful or misleading error messages, especially if coerce-errors are
thrown.

This patch is a first steps towards improving that. I'm happy to file
more changes after that, but I'd like to gather some feedback first.

To summarize, this patch does the following things:

* Attrsets (a.k.a. `Bindings` in `libexpr`) now have a `Pos`. This is
  helpful e.g. to identify which attribute-set in `listToAttrs` is
  invalid.

* The `Value`-struct has a new method named `determinePos` which tries
  to guess the position of a value and falls back to a default if that's
  not possible.

  This can be used to provide better messages if a coercion fails.

* The new `determinePos`-API is used by `builtins.concatMap` now. With
  that change, Nix shows the exact position in the error where a wrong
  value was returned by the lambda.

  To make sure it's still obvious that `concatMap` is the problem,
  another stack-frame was added.

* The changes described above can be added to every other `primop`, but
  first I'd like to get some feedback about the overall approach.
2021-04-13 23:12:38 +02:00
.github Bump cachix/cachix-action from v9 to v10 2021-04-12 05:21:11 +00:00
config Update config.guess for proper arm64 macOS detection 2020-12-02 19:14:34 -06:00
contrib function-trace: always show the trace 2019-09-18 23:23:21 +02:00
doc/manual [prerequisites]: add JSON lib dependency 2021-04-01 22:54:09 +01:00
m4 autoconf: Fix C++17 detection not working on Ubuntu 16.04. 2019-07-03 04:32:25 +02:00
maintainers set Content-Type to "text/plain" for install script 2020-08-20 13:21:22 +02:00
misc Add some missing clean-files 2020-10-18 20:32:59 +02:00
mk Merge pull request #4582 from puckipedia/cppflags 2021-03-01 13:08:14 +01:00
nix-rust Remove 'dist' target 2020-12-03 16:17:58 +01:00
perl Make sodium a required dependency 2021-01-06 17:56:53 +01:00
scripts Merge pull request #4532 from abathur/macos_nixbld_ids 2021-03-25 10:35:56 +01:00
src libexpr: misc improvements for proper error position 2021-04-13 23:12:38 +02:00
tests Merge pull request #4676 from bjornfor/fix-fetchgit-ref-head 2021-03-30 12:07:05 +02:00
.dir-locals.el .dir-locals.el: Set c-block-comment-prefix 2020-07-10 11:21:06 +02:00
.editorconfig Add .editorconfig 2017-06-05 22:57:28 +01:00
.gitignore Generate separate manpages for each nix subcommand 2020-12-02 23:23:23 +01:00
.version Revert "Bump version to 3.0" 2020-10-26 11:30:18 +01:00
bootstrap.sh bootstrap: Simplify & make more robust. 2011-09-06 12:11:05 +00:00
configure.ac Add x86_64 compute levels as additional system types 2021-02-22 09:11:15 +01:00
COPYING * Change this to LGPL to keep the government happy. 2006-04-25 16:41:06 +00:00
default.nix Simplify shell.nix and default.nix 2020-06-17 19:21:46 +02:00
flake.lock flake.lock: Update 2021-02-26 16:03:39 +01:00
flake.nix Merge pull request #4239 from tweag/test-against-old-daemon 2021-03-29 16:15:36 +02:00
local.mk Remove 'dist' target 2020-12-03 16:17:58 +01:00
Makefile Move command plugin interface to libnixcmd 2021-01-26 06:22:24 -05:00
Makefile.config.in Properly propagate libseccomp linker flags 2021-02-26 23:01:16 +00:00
precompiled-headers.h Config: Use nlohmann/json 2020-08-20 11:02:16 +02:00
README.md README: fix link to hacking guide 2020-12-28 09:30:14 -08:00
shell.nix Add back flake-compat shell.nix 2020-07-17 14:58:59 +00:00

README.md

Nix

Open Collective supporters Test

Nix is a powerful package manager for Linux and other Unix systems that makes package management reliable and reproducible. Please refer to the Nix manual for more details.

Installation

On Linux and macOS the easiest way to install Nix is to run the following shell command (as a user other than root):

$ curl -L https://nixos.org/nix/install | sh

Information on additional installation methods is available on the Nix download page.

Building And Developing

See our Hacking guide in our manual for instruction on how to build nix from source with nix-build or how to get a development environment.

Additional Resources

License

Nix is released under the LGPL v2.1.