forked from lix-project/lix
* nix flake check: improve error message if overlay is not a lambda Suppose you have an overlay like this { inputs = { /* ... */ }; outputs = { flake-utils, ... }: flake-utils.lib.eachDefaultSystem (system: { overlays.default = final: prev: { }; }); } then `nix flake check` (correctly) fails because `overlays` are supposed to have the structure `overlays.<name> = final: prev: exp`. However, the error-message is a little bit counter-intuitive: error: overlay does not take an argument named 'final' While one might guess where the error actually comes from because the trace above says `… while checking the overlay 'overlays.x86_64-linux'` this is still pretty confusing because it complains about an argument not being named `final` even though that's evidently the case. With this change, the error-message actually makes it clear what's wrong: [ma27@carsten:~/Projects/nix/tmp]$ nix flake check --extra-experimental-features 'nix-command flakes' path:$(pwd) error: … while checking flake output 'overlays' at /nix/store/clgblnxx003hyrq8qkz5ab6kgqkck6qc-source/flake.nix:4:5: 3| outputs = { ... }: { 4| overlays.x86_64-linux.snens = final: prev: { | ^ 5| kek = throw "snens"; … while checking the overlay 'overlays.x86_64-linux' at /nix/store/clgblnxx003hyrq8qkz5ab6kgqkck6qc-source/flake.nix:4:5: 3| outputs = { ... }: { 4| overlays.x86_64-linux.snens = final: prev: { | ^ 5| kek = throw "snens"; error: overlay is not a lambda, but a set instead |
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config | ||
contrib | ||
doc | ||
m4 | ||
maintainers | ||
misc | ||
mk | ||
perl | ||
scripts | ||
src | ||
tests | ||
.dir-locals.el | ||
.editorconfig | ||
.gitignore | ||
.version | ||
boehmgc-coroutine-sp-fallback.diff | ||
bootstrap.sh | ||
configure.ac | ||
CONTRIBUTING.md | ||
COPYING | ||
default.nix | ||
docker.nix | ||
flake.lock | ||
flake.nix | ||
local.mk | ||
Makefile | ||
Makefile.config.in | ||
precompiled-headers.h | ||
README.md | ||
shell.nix |
Nix
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 to set up a development environment and build Nix from source.
Additional Resources
- Nix manual
- Nix jobsets on hydra.nixos.org
- NixOS Discourse
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License
Nix is released under the LGPL v2.1.