e14c245934
When inlining a module with a problematic declaration, you usually get
get a not-so helpful error like this:
$ cat flake.nix
{
description = "A very basic flake";
inputs.nixpkgs.url = path:../.;
outputs = { self, nixpkgs }: {
nixosConfigurations.foo = nixpkgs.lib.nixosSystem {
system = "x86_64-linux";
modules = [
({ lib, ... }: { services.wrong = 2; })
{ services.nginx.enable = true; }
];
};
};
}
$ nixos-rebuild build --flake .#foo -L
error: The option `services.wrong' does not exist. Definition values:
- In `<unknown-file>': 2
While it's certainly possible to guess where this comes from, this is
IMHO fairly confusing for beginners (and kinda reminds me of the
infamous "infinite recursion at undefined position"-error).
The module-system determines the position of a declaration using the
`_file`-key: this is either `toString path` if `path` is e.g. a value
from `imports = [ ./foo.nix ]` or the file used as `NIXOS_CONFIG` in
`<nixpkgs/nixos>`.
However such a mechanism doesn't exist (yet) for inlined flake modules,
so I tried to implement this in a fairly basic way:
* For non-path declarations, the position of `modules` inside the
`flake.nix` which declares these modules is determined by doing
`unsafeGetAttrPos` on the `modules`-argument of `lib.nixosSystem`.
So the `flake.nix` from above would now raise the following
error-message:
$ nixos-rebuild build --flake .#foo -L
error: The option `services.wrong' does not exist. Definition values:
- In `/nix/store/4vi3nhqjyma73ygs4f93q38qjkhkaxw8-source/flake.nix': 2
Co-authored-by: Cole Helbling <cole.e.helbling@outlook.com>
Co-authored-by: Silvan Mosberger <github@infinisil.com>
Co-authored-by: Robert Hensing <robert@roberthensing.nl>
93 lines
3 KiB
Nix
93 lines
3 KiB
Nix
# Experimental flake interface to Nixpkgs.
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# See https://github.com/NixOS/rfcs/pull/49 for details.
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{
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description = "A collection of packages for the Nix package manager";
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outputs = { self }:
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let
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jobs = import ./pkgs/top-level/release.nix {
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nixpkgs = self;
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};
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lib = import ./lib;
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systems = [
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"x86_64-linux"
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"i686-linux"
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"x86_64-darwin"
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"aarch64-linux"
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"armv6l-linux"
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"armv7l-linux"
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"aarch64-darwin"
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];
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forAllSystems = f: lib.genAttrs systems (system: f system);
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in
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{
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lib = lib.extend (final: prev: {
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nixosSystem = { modules, ... } @ args:
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import ./nixos/lib/eval-config.nix (args // {
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modules =
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let
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vmConfig = (import ./nixos/lib/eval-config.nix
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(args // {
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modules = modules ++ [ ./nixos/modules/virtualisation/qemu-vm.nix ];
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})).config;
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vmWithBootLoaderConfig = (import ./nixos/lib/eval-config.nix
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(args // {
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modules = modules ++ [
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./nixos/modules/virtualisation/qemu-vm.nix
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{ virtualisation.useBootLoader = true; }
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({ config, ... }: {
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virtualisation.useEFIBoot =
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config.boot.loader.systemd-boot.enable ||
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config.boot.loader.efi.canTouchEfiVariables;
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})
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];
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})).config;
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moduleDeclarationFile =
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(builtins.unsafeGetAttrPos "modules" args).file;
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# Add the invoking file as error message location for modules
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# that don't have their own locations; presumably inline modules.
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addModuleDeclarationFile =
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m: {
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_file = moduleDeclarationFile;
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imports = [ m ];
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};
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in
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map addModuleDeclarationFile modules ++ [
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{
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system.nixos.versionSuffix =
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".${final.substring 0 8 (self.lastModifiedDate or self.lastModified or "19700101")}.${self.shortRev or "dirty"}";
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system.nixos.revision = final.mkIf (self ? rev) self.rev;
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system.build = {
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vm = vmConfig.system.build.vm;
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vmWithBootLoader = vmWithBootLoaderConfig.system.build.vm;
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};
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}
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];
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});
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});
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checks.x86_64-linux.tarball = jobs.tarball;
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htmlDocs = {
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nixpkgsManual = jobs.manual;
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nixosManual = (import ./nixos/release-small.nix {
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nixpkgs = self;
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}).nixos.manual.x86_64-linux;
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};
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legacyPackages = forAllSystems (system: import ./. { inherit system; });
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nixosModules = {
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notDetected = import ./nixos/modules/installer/scan/not-detected.nix;
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};
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};
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}
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