mirror of
https://github.com/NixOS/mobile-nixos.git
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94 lines
3.3 KiB
Nix
94 lines
3.3 KiB
Nix
# This is a shim that calls `evalWithConfiguration` automatically, with
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# some additional helpers.
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# This replaces the previously quite un-hermetic `default.nix` inclusion.
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# This is meant for use internally by Mobile NixOS, the interface here
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# should not be assumed to be *stable*.
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{
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pkgs ? null
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# The identifier of the device this should be built for.
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# (This gets massaged later on)
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, device ? null
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, configuration
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# Internally used to tack on configuration by release.nix
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, additionalConfiguration ? {}
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, additionalHelpInstructions ? ""
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}:
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if pkgs == null then (builtins.throw "The `pkgs` argument needs to be provided to eval-with-configuration.nix") else
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let
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inherit (pkgs.lib) optionalString strings;
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inherit (strings) concatStringsSep stringAsChars;
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# Either use:
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# The given `device`.
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# The environment variable.
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final_device =
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if device != null then device
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else throw "Please provide a device name using e.g. `--argstr device $DEVICE`."
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;
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inherit (import ./release-tools.nix { inherit pkgs; }) evalWith;
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# The "default" eval.
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eval = evalWith {
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device = final_device;
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modules = configuration;
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inherit additionalConfiguration;
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};
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# Makes a mostly useless header.
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# This is mainly useful for batch evals.
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header = str:
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let
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str' = "* ${str} *";
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line = stringAsChars (x: "*") str';
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in
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builtins.trace (concatStringsSep "\ntrace: " [line str' line])
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;
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# Merge the system-type outputs at the root of the outputs.
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outputs = eval.config.mobile.outputs // eval.config.mobile.outputs.${eval.config.mobile.system.type};
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in
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(
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# Don't break if `device` is not set.
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if device == null then (id: id) else
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if device ? special
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then header "Evaluating: ${device.name}"
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else if (builtins.tryEval (builtins.isPath device && builtins.pathExists device)).value
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then header "Evaluating device from path: ${toString device}"
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else header "Evaluating device: ${device}"
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)
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{
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# The build artifacts from the modules system.
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inherit outputs;
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build = builtins.trace "The `build` argument has been renamed `outputs`. This alias will be removed after 2022-05." outputs;
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# The evaluated config
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inherit (eval) config;
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# The final pkgs set, usable as -A pkgs.[...] on the CLI.
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inherit (eval) pkgs;
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# The whole (default) eval
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inherit eval;
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# Evaluating this whole set is counter-productive.
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# It'll put a *bunch* of build products from the misc. inherits we added.
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# (We're also using `device` to force the other throw to happen first.)
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# TODO : We may want to produce an internal list of available outputs, so that
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# each platform can document what it makes available. This would allow
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# the message to be more user-friendly by displaying a choice.
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# Something like `config.mobile.build.proposedOutputs` as a list of pairs [ "outputName" "description" ].
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__please-fail = throw ''
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Cannot directly build for ${final_device}...
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Building this whole set is counter-productive, and not likely to be what
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is desired.
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${optionalString (additionalHelpInstructions != "") "\n"}${additionalHelpInstructions}
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*************************************************
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* Please also read your device's documentation. *
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* It may contain further usage notes. *
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*************************************************
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'';
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}
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