nixpkgs/nixos/modules/misc/crashdump.nix
Eelco Dolstra 29027fd1e1 Rewrite ‘with pkgs.lib’ -> ‘with lib’
Using pkgs.lib on the spine of module evaluation is problematic
because the pkgs argument depends on the result of module
evaluation. To prevent an infinite recursion, pkgs and some of the
modules are evaluated twice, which is inefficient. Using ‘with lib’
prevents this problem.
2014-04-14 16:26:48 +02:00

79 lines
2.3 KiB
Nix

{ config, lib, pkgs, ... }:
with lib;
let
crashdump = config.boot.crashDump;
kernelParams = concatStringsSep " " crashdump.kernelParams;
in
###### interface
{
options = {
boot = {
crashDump = {
enable = mkOption {
type = types.bool;
default = false;
description = ''
If enabled, NixOS will set up a kernel that will
boot on crash, and leave the user to a stage1 debug1devices
interactive shell to be able to save the crashed kernel dump.
It also activates the NMI watchdog.
'';
};
kernelPackages = mkOption {
default = pkgs.linuxPackages;
# We don't want to evaluate all of linuxPackages for the manual
# - some of it might not even evaluate correctly.
defaultText = "pkgs.linuxPackages";
example = "pkgs.linuxPackages_2_6_25";
description = ''
This will override the boot.kernelPackages, and will add some
kernel configuration parameters for the crash dump to work.
'';
};
kernelParams = mkOption {
type = types.listOf types.str;
default = [ "debug1devices" ];
description = ''
Parameters that will be passed to the kernel kexec-ed on crash.
'';
};
};
};
};
###### implementation
config = mkIf crashdump.enable {
boot = {
postBootCommands = ''
${pkgs.kexectools}/sbin/kexec -p /run/current-system/kernel \
--initrd=/run/current-system/initrd \
--append="init=$(readlink -f /run/current-system/init) system=$(readlink -f /run/current-system) irqpoll maxcpus=1 reset_devices ${kernelParams}" --reset-vga --console-vga
'';
kernelParams = [
"crashkernel=64M"
"nmi_watchdog=panic"
"softlockup_panic=1"
"idle=poll"
];
kernelPackages = mkOverride 50 (crashdump.kernelPackages // {
kernel = crashdump.kernelPackages.kernel.override
(attrs: {
extraConfig = (optionalString (attrs ? extraConfig) attrs.extraConfig) +
''
CRASH_DUMP y
DEBUG_INFO y
PROC_VMCORE y
LOCKUP_DETECTOR y
HARDLOCKUP_DETECTOR y
'';
});
});
};
};
}