From 895090bf89cd1a9cd7bc3ea7edd3bd2a0ae9d88f Mon Sep 17 00:00:00 2001 From: Peter Hoeg Date: Mon, 12 Jul 2021 15:36:22 +0800 Subject: [PATCH] nixos/earlyoom: use the newly introduced systembus-notify option Also some cleanups. --- nixos/modules/services/system/earlyoom.nix | 155 ++++++++++----------- 1 file changed, 70 insertions(+), 85 deletions(-) diff --git a/nixos/modules/services/system/earlyoom.nix b/nixos/modules/services/system/earlyoom.nix index b355df056bc1..ddd5bcebcdd5 100644 --- a/nixos/modules/services/system/earlyoom.nix +++ b/nixos/modules/services/system/earlyoom.nix @@ -1,81 +1,73 @@ { config, lib, pkgs, ... }: -with lib; - let - ecfg = config.services.earlyoom; + cfg = config.services.earlyoom; + + inherit (lib) + mkDefault mkEnableOption mkIf mkOption types + mkRemovedOptionModule + concatStringsSep optional; + in { - options = { - services.earlyoom = { + options.services.earlyoom = { + enable = mkEnableOption "Early out of memory killing"; - enable = mkOption { - type = types.bool; - default = false; - description = '' - Enable early out of memory killing. - ''; - }; + freeMemThreshold = mkOption { + type = types.ints.between 1 100; + default = 10; + description = '' + Minimum of availabe memory (in percent). + If the free memory falls below this threshold and the analog is true for + + the killing begins. + ''; + }; - freeMemThreshold = mkOption { - type = types.int; - default = 10; - description = '' - Minimum of availabe memory (in percent). - If the free memory falls below this threshold and the analog is true for - - the killing begins. - ''; - }; + freeSwapThreshold = mkOption { + type = types.ints.between 1 100; + default = 10; + description = '' + Minimum of availabe swap space (in percent). + If the available swap space falls below this threshold and the analog + is true for + the killing begins. + ''; + }; - freeSwapThreshold = mkOption { - type = types.int; - default = 10; - description = '' - Minimum of availabe swap space (in percent). - If the available swap space falls below this threshold and the analog - is true for - the killing begins. - ''; - }; + # TODO: remove or warn after 1.7 (https://github.com/rfjakob/earlyoom/commit/7ebc4554) + ignoreOOMScoreAdjust = mkOption { + type = types.bool; + default = false; + description = '' + Ignore oom_score_adjust values of processes. + ''; + }; - # TODO: remove or warn after 1.7 (https://github.com/rfjakob/earlyoom/commit/7ebc4554) - ignoreOOMScoreAdjust = mkOption { - type = types.bool; - default = false; - description = '' - Ignore oom_score_adjust values of processes. - ''; - }; + enableDebugInfo = mkOption { + type = types.bool; + default = false; + description = '' + Enable debugging messages. + ''; + }; - enableDebugInfo = mkOption { - type = types.bool; - default = false; - description = '' - Enable debugging messages. - ''; - }; + enableNotifications = mkOption { + type = types.bool; + default = false; + description = '' + Send notifications about killed processes via the system d-bus. - notificationsCommand = mkOption { - type = types.nullOr types.str; - default = null; - description = '' - This option is deprecated and ignored by earlyoom since 1.6. - Use instead. - ''; - }; + WARNING: enabling this option (while convenient) should *not* be done on a + machine where you do not trust the other users as it allows any other + local user to DoS your session by spamming notifications. - enableNotifications = mkOption { - type = types.bool; - default = false; - description = '' - Send notifications about killed processes via the system d-bus. - To actually see the notifications in your GUI session, you need to have - systembus-notify running as your user. + To actually see the notifications in your GUI session, you need to have + systembus-notify running as your user which this + option handles. - See README for details. - ''; - }; + See README for details. + ''; }; }; @@ -83,37 +75,30 @@ in (mkRemovedOptionModule [ "services" "earlyoom" "useKernelOOMKiller" ] '' This option is deprecated and ignored by earlyoom since 1.2. '') + (mkRemovedOptionModule [ "services" "earlyoom" "notificationsCommand" ] '' + This option is deprecated and ignored by earlyoom since 1.6. + '') ]; - config = mkIf ecfg.enable { - assertions = [ - { assertion = ecfg.freeMemThreshold > 0 && ecfg.freeMemThreshold <= 100; - message = "Needs to be a positive percentage"; } - { assertion = ecfg.freeSwapThreshold > 0 && ecfg.freeSwapThreshold <= 100; - message = "Needs to be a positive percentage"; } - ]; - - # TODO: reimplement this option as -N after 1.7 (https://github.com/rfjakob/earlyoom/commit/afe03606) - warnings = optional (ecfg.notificationsCommand != null) - "`services.earlyoom.notificationsCommand` is deprecated and ignored by earlyoom since 1.6."; + config = mkIf cfg.enable { + services.systembus-notify.enable = mkDefault cfg.enableNotifications; systemd.services.earlyoom = { description = "Early OOM Daemon for Linux"; wantedBy = [ "multi-user.target" ]; - path = optional ecfg.enableNotifications pkgs.dbus; + path = optional cfg.enableNotifications pkgs.dbus; serviceConfig = { - StandardOutput = "null"; StandardError = "journal"; ExecStart = concatStringsSep " " ([ "${pkgs.earlyoom}/bin/earlyoom" - "-m ${toString ecfg.freeMemThreshold}" - "-s ${toString ecfg.freeSwapThreshold}" - ] ++ optional ecfg.ignoreOOMScoreAdjust "-i" - ++ optional ecfg.enableDebugInfo "-d" - ++ optional ecfg.enableNotifications "-n"); + "-m ${toString cfg.freeMemThreshold}" + "-s ${toString cfg.freeSwapThreshold}" + ] + ++ optional cfg.ignoreOOMScoreAdjust "-i" + ++ optional cfg.enableDebugInfo "-d" + ++ optional cfg.enableNotifications "-n" + ); }; }; - - environment.systemPackages = optional ecfg.enableNotifications pkgs.systembus-notify; }; }