nixpkgs/flake.nix

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# Experimental flake interface to Nixpkgs.
# See https://github.com/NixOS/rfcs/pull/49 for details.
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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
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 = lib.systems.supported.hydra;
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forAllSystems = f: lib.genAttrs systems (system: f system);
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in
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{
lib = lib.extend (final: prev: {
nixosSystem = { modules, ... } @ args:
import ./nixos/lib/eval-config.nix (args // {
modules =
let
flake/lib.nixosSystem: add `_file`-keys for error-location 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>
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moduleDeclarationFile =
let
# Even though `modules` is a mandatory argument for `nixosSystem`, it doesn't
# mean that the evaluator always keeps track of its position. If there
# are too many levels of indirection, the position gets lost at some point.
intermediatePos = builtins.unsafeGetAttrPos "modules" args;
in
if intermediatePos == null then null else intermediatePos.file;
flake/lib.nixosSystem: add `_file`-keys for error-location 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>
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# Add the invoking file as error message location for modules
# that don't have their own locations; presumably inline modules.
addModuleDeclarationFile =
m: if moduleDeclarationFile == null then m else {
flake/lib.nixosSystem: add `_file`-keys for error-location 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>
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_file = moduleDeclarationFile;
imports = [ m ];
};
in
flake/lib.nixosSystem: add `_file`-keys for error-location 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>
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map addModuleDeclarationFile modules ++ [
({ config, ... }: {
system.nixos.versionSuffix =
".${final.substring 0 8 (self.lastModifiedDate or self.lastModified or "19700101")}.${self.shortRev or "dirty"}";
system.nixos.revision = final.mkIf (self ? rev) self.rev;
system.build = {
vm = lib.mkDefault config.virtualisation.vmVariant.system.build.vm;
vmWithBootLoader = lib.mkDefault config.virtualisation.vmVariantWithBootLoader.system.build.vm;
};
})
];
});
});
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checks.x86_64-linux.tarball = jobs.tarball;
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htmlDocs = {
nixpkgsManual = jobs.manual;
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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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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};
}