2e751c0772
the conversion procedure is simple: - find all things that look like options, ie calls to either `mkOption` or `lib.mkOption` that take an attrset. remember the attrset as the option - for all options, find a `description` attribute who's value is not a call to `mdDoc` or `lib.mdDoc` - textually convert the entire value of the attribute to MD with a few simple regexes (the set from mdize-module.sh) - if the change produced a change in the manual output, discard - if the change kept the manual unchanged, add some text to the description to make sure we've actually found an option. if the manual changes this time, keep the converted description this procedure converts 80% of nixos options to markdown. around 2000 options remain to be inspected, but most of those fail the "does not change the manual output check": currently the MD conversion process does not faithfully convert docbook tags like <code> and <package>, so any option using such tags will not be converted at all.
77 lines
2.1 KiB
Nix
77 lines
2.1 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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crashdump = config.boot.crashDump;
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kernelParams = concatStringsSep " " crashdump.kernelParams;
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in
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###### interface
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{
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options = {
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boot = {
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crashDump = {
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enable = mkOption {
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type = types.bool;
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default = false;
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description = lib.mdDoc ''
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If enabled, NixOS will set up a kernel that will
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boot on crash, and leave the user in systemd rescue
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to be able to save the crashed kernel dump at
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/proc/vmcore.
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It also activates the NMI watchdog.
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'';
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};
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reservedMemory = mkOption {
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default = "128M";
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type = types.str;
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description = lib.mdDoc ''
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The amount of memory reserved for the crashdump kernel.
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If you choose a too high value, dmesg will mention
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"crashkernel reservation failed".
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'';
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};
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kernelParams = mkOption {
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type = types.listOf types.str;
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default = [ "1" "boot.shell_on_fail" ];
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description = lib.mdDoc ''
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Parameters that will be passed to the kernel kexec-ed on crash.
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'';
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};
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};
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};
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};
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###### implementation
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config = mkIf crashdump.enable {
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boot = {
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postBootCommands = ''
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echo "loading crashdump kernel...";
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${pkgs.kexec-tools}/sbin/kexec -p /run/current-system/kernel \
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--initrd=/run/current-system/initrd \
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--reset-vga --console-vga \
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--command-line="init=$(readlink -f /run/current-system/init) irqpoll maxcpus=1 reset_devices ${kernelParams}"
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'';
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kernelParams = [
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"crashkernel=${crashdump.reservedMemory}"
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"nmi_watchdog=panic"
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"softlockup_panic=1"
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];
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kernelPatches = [ {
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name = "crashdump-config";
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patch = null;
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extraConfig = ''
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CRASH_DUMP y
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DEBUG_INFO y
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PROC_VMCORE y
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LOCKUP_DETECTOR y
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HARDLOCKUP_DETECTOR y
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'';
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} ];
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};
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};
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}
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