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https://github.com/NixOS/mobile-nixos.git
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bdd234fc0e
This needs to be plugged into the init via duck-typing.
73 lines
1.9 KiB
Nix
73 lines
1.9 KiB
Nix
{ config, lib, pkgs, ... }:
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let
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inherit (lib) mkMerge mkIf mkOption types;
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cfg = config.mobile.boot.stage-1.shell;
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in
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{
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options.mobile.boot.stage-1.shell = {
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enable = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Enables a shell before switching root.
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This shell (as currently configured) will not allow switching root.
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'';
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};
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console = mkOption {
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type = types.str;
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default = "console";
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description = ''
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Selects the /dev/___ device to use.
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Use `ttyS0` for serial, `tty1` for first VT or keep the default to `console`
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for the last defined `console=` kernel parameter.
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'';
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};
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shellOnFail = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Enables a shell on failures.
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'';
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};
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};
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config.mobile.boot.stage-1 = mkMerge [
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(mkIf (cfg.enable || cfg.shellOnFail) {
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tasks = [
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(pkgs.writeText "system-shell.rb" ''
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module System
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def self.shell()
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cmd = %q{setsid /bin/sh -c /bin/sh < /dev/${cfg.console} >/dev/${cfg.console} 2>/dev/${cfg.console}}
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$logger.debug(" $ #{cmd}")
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puts("\nExit this shell (CTRL+D) to resume booting.\n")
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system(cmd)
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end
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end
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'')
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];
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})
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(mkIf cfg.enable {
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tasks = [
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(pkgs.writeText "run-shell-task.rb" ''
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class Tasks::RunShell < SingletonTask
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def initialize()
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# Wedge the task between the target "root", and the
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# actual task we want to prevent running.
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add_dependency(:Target, :SwitchRoot)
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Tasks::SwitchRoot.instance.add_dependency(:Task, self)
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end
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def run()
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System.shell()
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end
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end
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'')
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];
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})
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];
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}
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