nixpkgs/nixos/modules/misc/crashdump.nix
symphorien 6dfbef0ae2 nixos/crashdump: fix evaluation. ()
The module would fail to evaluate:
```The option value `boot.crashDump.kernelPackages' in ... is not a package.```

Removed the option boot.crashDump.kernelPackage in favor of using
boot.kernelPatches which automatically chooses the same kernel version
as boot.kernelPackage instead of overriding it.

Added option boot.crashDump.reservedMemory to customized crash kernel
memory.

Changed the default of boot.crashDump.kernelParams as the current one
seemed to have no effect.
2017-10-25 20:00:52 +00:00

77 lines
2.1 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 in systemd rescue
to be able to save the crashed kernel dump at
/proc/vmcore.
It also activates the NMI watchdog.
'';
};
reservedMemory = mkOption {
default = "128M";
description = ''
The amount of memory reserved for the crashdump kernel.
If you choose a too high value, dmesg will mention
"crashkernel reservation failed".
'';
};
kernelParams = mkOption {
type = types.listOf types.str;
default = [ "1" "boot.shell_on_fail" ];
description = ''
Parameters that will be passed to the kernel kexec-ed on crash.
'';
};
};
};
};
###### implementation
config = mkIf crashdump.enable {
boot = {
postBootCommands = ''
echo "loading crashdump kernel...";
${pkgs.kexectools}/sbin/kexec -p /run/current-system/kernel \
--initrd=/run/current-system/initrd \
--reset-vga --console-vga \
--command-line="systemConfig=$(readlink -f /run/current-system) init=$(readlink -f /run/current-system/init) irqpoll maxcpus=1 reset_devices ${kernelParams}"
'';
kernelParams = [
"crashkernel=${crashdump.reservedMemory}"
"nmi_watchdog=panic"
"softlockup_panic=1"
"idle=poll"
];
kernelPatches = [ {
name = "crashdump-config";
patch = null;
extraConfig = ''
CRASH_DUMP y
DEBUG_INFO y
PROC_VMCORE y
LOCKUP_DETECTOR y
HARDLOCKUP_DETECTOR y
'';
} ];
};
};
}