mirror of
https://github.com/NixOS/mobile-nixos.git
synced 2024-09-11 12:05:26 +03:00
113 lines
3.8 KiB
Nix
113 lines
3.8 KiB
Nix
let
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# Selection of the device can be made either through the environment or through
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# using `--argstr device [...]`.
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deviceFromEnv = builtins.getEnv "MOBILE_NIXOS_DEVICE";
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# Selection of the configuration can by made either through NIX_PATH,
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# through local.nix or as a parameter.
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default_configuration =
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let
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configPathFromNixPath = (builtins.tryEval <mobile-nixos-configuration>).value;
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in
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if configPathFromNixPath != false then [ configPathFromNixPath ]
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else if (builtins.pathExists ./local.nix) then builtins.trace "WARNING: evaluation includes ./local.nix" [ (import ./local.nix) ]
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else []
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;
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# "a" nixpkgs we're using for its lib.
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pkgs' = import <nixpkgs> {};
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inherit (pkgs'.lib) optional strings;
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inherit (strings) concatStringsSep stringAsChars;
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in
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{
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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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# This allows using `default.nix` as a pass-through function.
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# See usage in examples folder.
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device ? null
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, configuration ? default_configuration
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# Internally used to tack on configuration by release.nix
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, additionalConfiguration ? {}
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}:
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let
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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 if deviceFromEnv == "" then
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throw "Please pass a device name or set the MOBILE_NIXOS_DEVICE environment variable."
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else deviceFromEnv
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;
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inherit (import ./lib/release-tools.nix) 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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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 (eval.config.system) build;
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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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__please-fail = throw ''
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Cannot directly build for ${final_device}...
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Building this whole set is counter-productive, and not likely to be what
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is desired.
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You can build the `-A build.default` attribute to build an empty and
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un-configured image. That image can be configured using `local.nix`.
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**Note that an unconfigured image may appear to hang at boot.**
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An alternative is to use one of the `examples` system. They differ in their
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configuration. An example that should be building, and working using
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cross-compilation is the `examples/hello` system. Read its README for more
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information.
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$ nix-build examples/hello --argstr device ${final_device} -A build.default
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*************************************************************************
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* Please also read your device's documentation for further usage notes. *
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*************************************************************************
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'';
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}
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