264 lines
9.7 KiB
Nix
264 lines
9.7 KiB
Nix
{ config, lib, pkgs, utils, ... }:
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with lib;
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let
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cfg = config.services.logrotate;
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generateLine = n: v:
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if builtins.elem n [ "files" "priority" "enable" "global" ] || v == null then null
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else if builtins.elem n [ "frequency" ] then "${v}\n"
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else if builtins.elem n [ "firstaction" "lastaction" "prerotate" "postrotate" "preremove" ]
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then "${n}\n ${v}\n endscript\n"
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else if isInt v then "${n} ${toString v}\n"
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else if v == true then "${n}\n"
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else if v == false then "no${n}\n"
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else "${n} ${v}\n";
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generateSection = indent: settings: concatStringsSep (fixedWidthString indent " " "") (
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filter (x: x != null) (mapAttrsToList generateLine settings)
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);
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# generateSection includes a final newline hence weird closing brace
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mkConf = settings:
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if settings.global or false then generateSection 0 settings
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else ''
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${concatMapStringsSep "\n" (files: ''"${files}"'') (toList settings.files)} {
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${generateSection 2 settings}}
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'';
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settings = sortProperties (attrValues (filterAttrs (_: settings: settings.enable) (
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foldAttrs recursiveUpdate { } [
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{
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header = {
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enable = true;
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missingok = true;
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notifempty = true;
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frequency = "weekly";
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rotate = 4;
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};
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}
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cfg.settings
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{ header = { global = true; priority = 100; }; }
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]
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)));
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configFile = pkgs.writeTextFile {
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name = "logrotate.conf";
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text = concatStringsSep "\n" (
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map mkConf settings
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);
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checkPhase = optionalString cfg.checkConfig ''
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# logrotate --debug also checks that users specified in config
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# file exist, but we only have sandboxed users here so brown these
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# out. according to man page that means su, create and createolddir.
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# files required to exist also won't be present, so missingok is forced.
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user=$(${pkgs.buildPackages.coreutils}/bin/id -un)
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group=$(${pkgs.buildPackages.coreutils}/bin/id -gn)
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sed -e "s/\bsu\s.*/su $user $group/" \
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-e "s/\b\(create\s\+[0-9]*\s*\|createolddir\s\+[0-9]*\s\+\).*/\1$user $group/" \
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-e "1imissingok" -e "s/\bnomissingok\b//" \
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$out > logrotate.conf
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# Since this makes for very verbose builds only show real error.
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# There is no way to control log level, but logrotate hardcodes
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# 'error:' at common log level, so we can use grep, taking care
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# to keep error codes
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set -o pipefail
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if ! ${pkgs.buildPackages.logrotate}/sbin/logrotate -s logrotate.status \
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--debug logrotate.conf 2>&1 \
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| ( ! grep "error:" ) > logrotate-error; then
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echo "Logrotate configuration check failed."
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echo "The failing configuration (after adjustments to pass tests in sandbox) was:"
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printf "%s\n" "-------"
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cat logrotate.conf
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printf "%s\n" "-------"
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echo "The error reported by logrotate was as follow:"
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printf "%s\n" "-------"
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cat logrotate-error
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printf "%s\n" "-------"
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echo "You can disable this check with services.logrotate.checkConfig = false,"
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echo "but if you think it should work please report this failure along with"
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echo "the config file being tested!"
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false
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fi
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'';
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};
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mailOption =
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optionalString (foldr (n: a: a || (n.mail or false) != false) false (attrValues cfg.settings))
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"--mail=${pkgs.mailutils}/bin/mail";
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in
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{
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imports = [
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(mkRemovedOptionModule [ "services" "logrotate" "config" ] "Modify services.logrotate.settings.header instead")
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(mkRemovedOptionModule [ "services" "logrotate" "extraConfig" ] "Modify services.logrotate.settings.header instead")
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(mkRemovedOptionModule [ "services" "logrotate" "paths" ] "Add attributes to services.logrotate.settings instead")
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];
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options = {
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services.logrotate = {
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enable = mkEnableOption "the logrotate systemd service" // {
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default = foldr (n: a: a || n.enable) false (attrValues cfg.settings);
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defaultText = literalExpression "cfg.settings != {}";
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};
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settings = mkOption {
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default = { };
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description = ''
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logrotate freeform settings: each attribute here will define its own section,
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ordered by {option}`services.logrotate.settings.<name>.priority`,
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which can either define files to rotate with their settings
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or settings common to all further files settings.
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All attribute names not explicitly defined as sub-options here are passed through
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as logrotate config directives,
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refer to <https://linux.die.net/man/8/logrotate> for details.
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'';
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example = literalExpression ''
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{
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# global options
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header = {
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dateext = true;
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};
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# example custom files
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"/var/log/mylog.log" = {
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frequency = "daily";
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rotate = 3;
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};
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"multiple paths" = {
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files = [
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"/var/log/first*.log"
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"/var/log/second.log"
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];
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};
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# specify custom order of sections
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"/var/log/myservice/*.log" = {
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# ensure lower priority
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priority = 110;
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postrotate = '''
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systemctl reload myservice
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''';
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};
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};
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'';
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type = types.attrsOf (types.submodule ({ name, ... }: {
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freeformType = with types; attrsOf (nullOr (oneOf [ int bool str ]));
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options = {
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enable = mkEnableOption "setting individual kill switch" // {
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default = true;
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};
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global = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether this setting is a global option or not: set to have these
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settings apply to all files settings with a higher priority.
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'';
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};
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files = mkOption {
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type = with types; either str (listOf str);
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default = name;
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defaultText = ''
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The attrset name if not specified
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'';
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description = ''
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Single or list of files for which rules are defined.
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The files are quoted with double-quotes in logrotate configuration,
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so globs and spaces are supported.
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Note this setting is ignored if globals is true.
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'';
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};
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frequency = mkOption {
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type = types.nullOr types.str;
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default = null;
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description = ''
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How often to rotate the logs. Defaults to previously set global setting,
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which itself defaults to weekly.
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'';
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};
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priority = mkOption {
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type = types.int;
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default = 1000;
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description = ''
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Order of this logrotate block in relation to the others. The semantics are
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the same as with `lib.mkOrder`. Smaller values are inserted first.
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'';
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};
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};
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}));
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};
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configFile = mkOption {
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type = types.path;
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default = configFile;
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defaultText = ''
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A configuration file automatically generated by NixOS.
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'';
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description = ''
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Override the configuration file used by logrotate. By default,
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NixOS generates one automatically from [](#opt-services.logrotate.settings).
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'';
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example = literalExpression ''
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pkgs.writeText "logrotate.conf" '''
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missingok
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"/var/log/*.log" {
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rotate 4
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weekly
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}
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''';
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'';
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};
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checkConfig = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whether the config should be checked at build time.
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Some options are not checkable at build time because of the build sandbox:
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for example, the test does not know about existing files and system users are
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not known.
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These limitations mean we must adjust the file for tests (missingok is forced
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and users are replaced by dummy users), so tests are complemented by a
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logrotate-checkconf service that is enabled by default.
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This extra check can be disabled by disabling it at the systemd level with the
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{option}`systemd.services.logrotate-checkconf.enable` option.
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Conversely there are still things that might make this check fail incorrectly
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(e.g. a file path where we don't have access to intermediate directories):
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in this case you can disable the failing check with this option.
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'';
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};
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extraArgs = lib.mkOption {
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type = lib.types.listOf lib.types.str;
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default = [];
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description = "Additional command line arguments to pass on logrotate invocation";
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};
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};
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};
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config = mkIf cfg.enable {
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systemd.services.logrotate = {
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description = "Logrotate Service";
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startAt = "hourly";
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serviceConfig = {
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Restart = "no";
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User = "root";
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ExecStart = "${pkgs.logrotate}/sbin/logrotate ${utils.escapeSystemdExecArgs cfg.extraArgs} ${mailOption} ${cfg.configFile}";
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};
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};
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systemd.services.logrotate-checkconf = {
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description = "Logrotate configuration check";
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wantedBy = [ "multi-user.target" ];
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serviceConfig = {
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Type = "oneshot";
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RemainAfterExit = true;
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ExecStart = "${pkgs.logrotate}/sbin/logrotate ${utils.escapeSystemdExecArgs cfg.extraArgs} --debug ${cfg.configFile}";
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};
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};
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};
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}
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