635 lines
21 KiB
Nix
635 lines
21 KiB
Nix
{ config, lib, pkgs, utils }:
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let
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inherit (lib)
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all
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attrByPath
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attrNames
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concatLists
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concatMap
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concatMapStrings
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concatStrings
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concatStringsSep
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const
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elem
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elemAt
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filter
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filterAttrs
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flatten
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flip
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head
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isInt
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isFloat
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isList
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isPath
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isString
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length
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makeBinPath
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makeSearchPathOutput
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mapAttrs
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mapAttrsToList
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mapNullable
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match
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mkAfter
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mkIf
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optional
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optionalAttrs
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optionalString
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pipe
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range
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replaceStrings
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reverseList
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splitString
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stringLength
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stringToCharacters
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tail
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toIntBase10
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trace
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types
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;
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inherit (lib.strings) toJSON;
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cfg = config.systemd;
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lndir = "${pkgs.buildPackages.xorg.lndir}/bin/lndir";
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systemd = cfg.package;
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in rec {
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shellEscape = s: (replaceStrings [ "\\" ] [ "\\\\" ] s);
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mkPathSafeName = replaceStrings ["@" ":" "\\" "[" "]"] ["-" "-" "-" "" ""];
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# a type for options that take a unit name
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unitNameType = types.strMatching "[a-zA-Z0-9@%:_.\\-]+[.](service|socket|device|mount|automount|swap|target|path|timer|scope|slice)";
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makeUnit = name: unit:
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if unit.enable then
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pkgs.runCommand "unit-${mkPathSafeName name}"
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{ preferLocalBuild = true;
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allowSubstitutes = false;
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# unit.text can be null. But variables that are null listed in
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# passAsFile are ignored by nix, resulting in no file being created,
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# making the mv operation fail.
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text = optionalString (unit.text != null) unit.text;
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passAsFile = [ "text" ];
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}
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''
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name=${shellEscape name}
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mkdir -p "$out/$(dirname -- "$name")"
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mv "$textPath" "$out/$name"
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''
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else
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pkgs.runCommand "unit-${mkPathSafeName name}-disabled"
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{ preferLocalBuild = true;
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allowSubstitutes = false;
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}
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''
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name=${shellEscape name}
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mkdir -p "$out/$(dirname "$name")"
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ln -s /dev/null "$out/$name"
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'';
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boolValues = [true false "yes" "no"];
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digits = map toString (range 0 9);
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isByteFormat = s:
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let
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l = reverseList (stringToCharacters s);
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suffix = head l;
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nums = tail l;
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in elem suffix (["K" "M" "G" "T"] ++ digits)
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&& all (num: elem num digits) nums;
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assertByteFormat = name: group: attr:
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optional (attr ? ${name} && ! isByteFormat attr.${name})
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"Systemd ${group} field `${name}' must be in byte format [0-9]+[KMGT].";
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toIntBaseDetected = value: assert (match "[0-9]+|0x[0-9a-fA-F]+" value) != null; (builtins.fromTOML "v=${value}").v;
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hexChars = stringToCharacters "0123456789abcdefABCDEF";
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isMacAddress = s: stringLength s == 17
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&& flip all (splitString ":" s) (bytes:
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all (byte: elem byte hexChars) (stringToCharacters bytes)
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);
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assertMacAddress = name: group: attr:
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optional (attr ? ${name} && ! isMacAddress attr.${name})
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"Systemd ${group} field `${name}' must be a valid MAC address.";
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assertNetdevMacAddress = name: group: attr:
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optional (attr ? ${name} && (! isMacAddress attr.${name} && attr.${name} != "none"))
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"Systemd ${group} field `${name}` must be a valid MAC address or the special value `none`.";
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isNumberOrRangeOf = check: v:
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if isInt v
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then check v
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else let
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parts = splitString "-" v;
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lower = toIntBase10 (head parts);
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upper = if tail parts != [] then toIntBase10 (head (tail parts)) else lower;
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in
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length parts <= 2 && lower <= upper && check lower && check upper;
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isPort = i: i >= 0 && i <= 65535;
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isPortOrPortRange = isNumberOrRangeOf isPort;
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assertPort = name: group: attr:
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optional (attr ? ${name} && ! isPort attr.${name})
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"Error on the systemd ${group} field `${name}': ${attr.name} is not a valid port number.";
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assertPortOrPortRange = name: group: attr:
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optional (attr ? ${name} && ! isPortOrPortRange attr.${name})
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"Error on the systemd ${group} field `${name}': ${attr.name} is not a valid port number or range of port numbers.";
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assertValueOneOf = name: values: group: attr:
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optional (attr ? ${name} && !elem attr.${name} values)
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"Systemd ${group} field `${name}' cannot have value `${toString attr.${name}}'.";
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assertValuesSomeOfOr = name: values: default: group: attr:
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optional (attr ? ${name} && !(all (x: elem x values) (splitString " " attr.${name}) || attr.${name} == default))
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"Systemd ${group} field `${name}' cannot have value `${toString attr.${name}}'.";
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assertHasField = name: group: attr:
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optional (!(attr ? ${name}))
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"Systemd ${group} field `${name}' must exist.";
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assertRange = name: min: max: group: attr:
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optional (attr ? ${name} && !(min <= attr.${name} && max >= attr.${name}))
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"Systemd ${group} field `${name}' is outside the range [${toString min},${toString max}]";
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assertRangeOrOneOf = name: min: max: values: group: attr:
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optional (attr ? ${name} && !(((isInt attr.${name} || isFloat attr.${name}) && min <= attr.${name} && max >= attr.${name}) || elem attr.${name} values))
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"Systemd ${group} field `${name}' is not a value in range [${toString min},${toString max}], or one of ${toString values}";
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assertRangeWithOptionalMask = name: min: max: group: attr:
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if (attr ? ${name}) then
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if isInt attr.${name} then
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assertRange name min max group attr
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else if isString attr.${name} then
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let
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fields = match "([0-9]+|0x[0-9a-fA-F]+)(/([0-9]+|0x[0-9a-fA-F]+))?" attr.${name};
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in if fields == null then ["Systemd ${group} field `${name}' must either be an integer or two integers separated by a slash (/)."]
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else let
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value = toIntBaseDetected (elemAt fields 0);
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mask = mapNullable toIntBaseDetected (elemAt fields 2);
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in
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optional (!(min <= value && max >= value)) "Systemd ${group} field `${name}' has main value outside the range [${toString min},${toString max}]."
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++ optional (mask != null && !(min <= mask && max >= mask)) "Systemd ${group} field `${name}' has mask outside the range [${toString min},${toString max}]."
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else ["Systemd ${group} field `${name}' must either be an integer or a string."]
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else [];
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assertMinimum = name: min: group: attr:
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optional (attr ? ${name} && attr.${name} < min)
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"Systemd ${group} field `${name}' must be greater than or equal to ${toString min}";
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assertOnlyFields = fields: group: attr:
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let badFields = filter (name: ! elem name fields) (attrNames attr); in
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optional (badFields != [ ])
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"Systemd ${group} has extra fields [${concatStringsSep " " badFields}].";
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assertInt = name: group: attr:
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optional (attr ? ${name} && !isInt attr.${name})
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"Systemd ${group} field `${name}' is not an integer";
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assertRemoved = name: see: group: attr:
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optional (attr ? ${name})
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"Systemd ${group} field `${name}' has been removed. See ${see}";
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checkUnitConfig = group: checks: attrs: let
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# We're applied at the top-level type (attrsOf unitOption), so the actual
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# unit options might contain attributes from mkOverride and mkIf that we need to
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# convert into single values before checking them.
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defs = mapAttrs (const (v:
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if v._type or "" == "override" then v.content
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else if v._type or "" == "if" then v.content
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else v
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)) attrs;
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errors = concatMap (c: c group defs) checks;
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in if errors == [] then true
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else trace (concatStringsSep "\n" errors) false;
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checkUnitConfigWithLegacyKey = legacyKey: group: checks: attrs:
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let
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dump = lib.generators.toPretty { }
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(lib.generators.withRecursion { depthLimit = 2; throwOnDepthLimit = false; } attrs);
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attrs' =
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if legacyKey == null
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then attrs
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else if ! attrs?${legacyKey}
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then attrs
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else if removeAttrs attrs [ legacyKey ] == {}
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then attrs.${legacyKey}
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else throw ''
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The declaration
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${dump}
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must not mix unit options with the legacy key '${legacyKey}'.
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This can be fixed by moving all settings from within ${legacyKey}
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one level up.
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'';
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in
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checkUnitConfig group checks attrs';
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toOption = x:
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if x == true then "true"
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else if x == false then "false"
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else toString x;
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attrsToSection = as:
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concatStrings (concatLists (mapAttrsToList (name: value:
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map (x: ''
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${name}=${toOption x}
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'')
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(if isList value then value else [value]))
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as));
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generateUnits = { allowCollisions ? true, type, units, upstreamUnits, upstreamWants, packages ? cfg.packages, package ? cfg.package }:
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let
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typeDir = ({
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system = "system";
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initrd = "system";
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user = "user";
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nspawn = "nspawn";
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}).${type};
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in pkgs.runCommand "${type}-units"
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{ preferLocalBuild = true;
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allowSubstitutes = false;
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} ''
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mkdir -p $out
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# Copy the upstream systemd units we're interested in.
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for i in ${toString upstreamUnits}; do
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fn=${package}/example/systemd/${typeDir}/$i
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if ! [ -e $fn ]; then echo "missing $fn"; false; fi
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if [ -L $fn ]; then
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target="$(readlink "$fn")"
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if [ ''${target:0:3} = ../ ]; then
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ln -s "$(readlink -f "$fn")" $out/
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else
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cp -pd $fn $out/
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fi
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else
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ln -s $fn $out/
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fi
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done
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# Copy .wants links, but only those that point to units that
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# we're interested in.
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for i in ${toString upstreamWants}; do
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fn=${package}/example/systemd/${typeDir}/$i
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if ! [ -e $fn ]; then echo "missing $fn"; false; fi
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x=$out/$(basename $fn)
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mkdir $x
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for i in $fn/*; do
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y=$x/$(basename $i)
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cp -pd $i $y
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if ! [ -e $y ]; then rm $y; fi
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done
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done
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# Symlink all units provided listed in systemd.packages.
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packages="${toString packages}"
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# Filter duplicate directories
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declare -A unique_packages
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for k in $packages ; do unique_packages[$k]=1 ; done
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for i in ''${!unique_packages[@]}; do
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for fn in $i/etc/systemd/${typeDir}/* $i/lib/systemd/${typeDir}/*; do
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if ! [[ "$fn" =~ .wants$ ]]; then
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if [[ -d "$fn" ]]; then
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targetDir="$out/$(basename "$fn")"
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mkdir -p "$targetDir"
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${lndir} "$fn" "$targetDir"
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else
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ln -s $fn $out/
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fi
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fi
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done
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done
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# Symlink units defined by systemd.units where override strategy
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# shall be automatically detected. If these are also provided by
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# systemd or systemd.packages, then add them as
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# <unit-name>.d/overrides.conf, which makes them extend the
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# upstream unit.
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for i in ${toString (mapAttrsToList
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(n: v: v.unit)
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(filterAttrs (n: v: (attrByPath [ "overrideStrategy" ] "asDropinIfExists" v) == "asDropinIfExists") units))}; do
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fn=$(basename $i/*)
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if [ -e $out/$fn ]; then
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if [ "$(readlink -f $i/$fn)" = /dev/null ]; then
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ln -sfn /dev/null $out/$fn
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else
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${if allowCollisions then ''
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mkdir -p $out/$fn.d
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ln -s $i/$fn $out/$fn.d/overrides.conf
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'' else ''
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echo "Found multiple derivations configuring $fn!"
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exit 1
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''}
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fi
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else
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ln -fs $i/$fn $out/
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fi
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done
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# Symlink units defined by systemd.units which shall be
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# treated as drop-in file.
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for i in ${toString (mapAttrsToList
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(n: v: v.unit)
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(filterAttrs (n: v: v ? overrideStrategy && v.overrideStrategy == "asDropin") units))}; do
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fn=$(basename $i/*)
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mkdir -p $out/$fn.d
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ln -s $i/$fn $out/$fn.d/overrides.conf
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done
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# Create service aliases from aliases option.
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${concatStrings (mapAttrsToList (name: unit:
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concatMapStrings (name2: ''
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ln -sfn '${name}' $out/'${name2}'
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'') (unit.aliases or [])) units)}
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# Create .wants, .upholds and .requires symlinks from the wantedBy, upheldBy and
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# requiredBy options.
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${concatStrings (mapAttrsToList (name: unit:
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concatMapStrings (name2: ''
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mkdir -p $out/'${name2}.wants'
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ln -sfn '../${name}' $out/'${name2}.wants'/
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'') (unit.wantedBy or [])) units)}
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${concatStrings (mapAttrsToList (name: unit:
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concatMapStrings (name2: ''
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mkdir -p $out/'${name2}.upholds'
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ln -sfn '../${name}' $out/'${name2}.upholds'/
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'') (unit.upheldBy or [])) units)}
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${concatStrings (mapAttrsToList (name: unit:
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concatMapStrings (name2: ''
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mkdir -p $out/'${name2}.requires'
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ln -sfn '../${name}' $out/'${name2}.requires'/
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'') (unit.requiredBy or [])) units)}
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${optionalString (type == "system") ''
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# Stupid misc. symlinks.
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ln -s ${cfg.defaultUnit} $out/default.target
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ln -s ${cfg.ctrlAltDelUnit} $out/ctrl-alt-del.target
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ln -s rescue.target $out/kbrequest.target
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mkdir -p $out/getty.target.wants/
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ln -s ../autovt@tty1.service $out/getty.target.wants/
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ln -s ../remote-fs.target $out/multi-user.target.wants/
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''}
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''; # */
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makeJobScript = name: text:
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let
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scriptName = replaceStrings [ "\\" "@" ] [ "-" "_" ] (shellEscape name);
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out = (pkgs.writeShellScriptBin scriptName ''
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set -e
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${text}
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'').overrideAttrs (_: {
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# The derivation name is different from the script file name
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# to keep the script file name short to avoid cluttering logs.
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name = "unit-script-${scriptName}";
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});
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in "${out}/bin/${scriptName}";
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unitConfig = { config, name, options, ... }: {
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config = {
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unitConfig =
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optionalAttrs (config.requires != [])
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{ Requires = toString config.requires; }
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// optionalAttrs (config.wants != [])
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{ Wants = toString config.wants; }
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// optionalAttrs (config.upholds != [])
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{ Upholds = toString config.upholds; }
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// optionalAttrs (config.after != [])
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{ After = toString config.after; }
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// optionalAttrs (config.before != [])
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{ Before = toString config.before; }
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// optionalAttrs (config.bindsTo != [])
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{ BindsTo = toString config.bindsTo; }
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// optionalAttrs (config.partOf != [])
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{ PartOf = toString config.partOf; }
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// optionalAttrs (config.conflicts != [])
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{ Conflicts = toString config.conflicts; }
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// optionalAttrs (config.requisite != [])
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{ Requisite = toString config.requisite; }
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// optionalAttrs (config ? restartTriggers && config.restartTriggers != [])
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{ X-Restart-Triggers = "${pkgs.writeText "X-Restart-Triggers-${name}" (pipe config.restartTriggers [
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flatten
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(map (x: if isPath x then "${x}" else x))
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toString
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])}"; }
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// optionalAttrs (config ? reloadTriggers && config.reloadTriggers != [])
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{ X-Reload-Triggers = "${pkgs.writeText "X-Reload-Triggers-${name}" (pipe config.reloadTriggers [
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flatten
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(map (x: if isPath x then "${x}" else x))
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toString
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])}"; }
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// optionalAttrs (config.description != "") {
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Description = config.description; }
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// optionalAttrs (config.documentation != []) {
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Documentation = toString config.documentation; }
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// optionalAttrs (config.onFailure != []) {
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OnFailure = toString config.onFailure; }
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// optionalAttrs (config.onSuccess != []) {
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OnSuccess = toString config.onSuccess; }
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// optionalAttrs (options.startLimitIntervalSec.isDefined) {
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StartLimitIntervalSec = toString config.startLimitIntervalSec;
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} // optionalAttrs (options.startLimitBurst.isDefined) {
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StartLimitBurst = toString config.startLimitBurst;
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};
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};
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};
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serviceConfig = { name, config, ... }: {
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config = {
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name = "${name}.service";
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environment.PATH = mkIf (config.path != []) "${makeBinPath config.path}:${makeSearchPathOutput "bin" "sbin" config.path}";
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};
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};
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pathConfig = { name, config, ... }: {
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config = {
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name = "${name}.path";
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};
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};
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socketConfig = { name, config, ... }: {
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config = {
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name = "${name}.socket";
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};
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};
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sliceConfig = { name, config, ... }: {
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config = {
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name = "${name}.slice";
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};
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};
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targetConfig = { name, config, ... }: {
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config = {
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name = "${name}.target";
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};
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};
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timerConfig = { name, config, ... }: {
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config = {
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name = "${name}.timer";
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};
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};
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stage2ServiceConfig = {
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imports = [ serviceConfig ];
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# Default path for systemd services. Should be quite minimal.
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config.path = mkAfter [
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pkgs.coreutils
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pkgs.findutils
|
||
pkgs.gnugrep
|
||
pkgs.gnused
|
||
systemd
|
||
];
|
||
};
|
||
|
||
stage1ServiceConfig = serviceConfig;
|
||
|
||
mountConfig = { config, ... }: {
|
||
config = {
|
||
name = "${utils.escapeSystemdPath config.where}.mount";
|
||
mountConfig =
|
||
{ What = config.what;
|
||
Where = config.where;
|
||
} // optionalAttrs (config.type != "") {
|
||
Type = config.type;
|
||
} // optionalAttrs (config.options != "") {
|
||
Options = config.options;
|
||
};
|
||
};
|
||
};
|
||
|
||
automountConfig = { config, ... }: {
|
||
config = {
|
||
name = "${utils.escapeSystemdPath config.where}.automount";
|
||
automountConfig =
|
||
{ Where = config.where;
|
||
};
|
||
};
|
||
};
|
||
|
||
commonUnitText = def: lines: ''
|
||
[Unit]
|
||
${attrsToSection def.unitConfig}
|
||
'' + lines + optionalString (def.wantedBy != [ ]) ''
|
||
|
||
[Install]
|
||
WantedBy=${concatStringsSep " " def.wantedBy}
|
||
'';
|
||
|
||
targetToUnit = def:
|
||
{ inherit (def) name aliases wantedBy requiredBy upheldBy enable overrideStrategy;
|
||
text =
|
||
''
|
||
[Unit]
|
||
${attrsToSection def.unitConfig}
|
||
'';
|
||
};
|
||
|
||
serviceToUnit = def:
|
||
{ inherit (def) name aliases wantedBy requiredBy upheldBy enable overrideStrategy;
|
||
text = commonUnitText def (''
|
||
[Service]
|
||
'' + (let env = cfg.globalEnvironment // def.environment;
|
||
in concatMapStrings (n:
|
||
let s = optionalString (env.${n} != null)
|
||
"Environment=${toJSON "${n}=${env.${n}}"}\n";
|
||
# systemd max line length is now 1MiB
|
||
# https://github.com/systemd/systemd/commit/e6dde451a51dc5aaa7f4d98d39b8fe735f73d2af
|
||
in if stringLength s >= 1048576 then throw "The value of the environment variable ‘${n}’ in systemd service ‘${def.name}.service’ is too long." else s) (attrNames env))
|
||
+ (if def ? reloadIfChanged && def.reloadIfChanged then ''
|
||
X-ReloadIfChanged=true
|
||
'' else if (def ? restartIfChanged && !def.restartIfChanged) then ''
|
||
X-RestartIfChanged=false
|
||
'' else "")
|
||
+ optionalString (def ? stopIfChanged && !def.stopIfChanged) ''
|
||
X-StopIfChanged=false
|
||
'' + attrsToSection def.serviceConfig);
|
||
};
|
||
|
||
socketToUnit = def:
|
||
{ inherit (def) name aliases wantedBy requiredBy upheldBy enable overrideStrategy;
|
||
text = commonUnitText def ''
|
||
[Socket]
|
||
${attrsToSection def.socketConfig}
|
||
${concatStringsSep "\n" (map (s: "ListenStream=${s}") def.listenStreams)}
|
||
${concatStringsSep "\n" (map (s: "ListenDatagram=${s}") def.listenDatagrams)}
|
||
'';
|
||
};
|
||
|
||
timerToUnit = def:
|
||
{ inherit (def) name aliases wantedBy requiredBy upheldBy enable overrideStrategy;
|
||
text = commonUnitText def ''
|
||
[Timer]
|
||
${attrsToSection def.timerConfig}
|
||
'';
|
||
};
|
||
|
||
pathToUnit = def:
|
||
{ inherit (def) name aliases wantedBy requiredBy upheldBy enable overrideStrategy;
|
||
text = commonUnitText def ''
|
||
[Path]
|
||
${attrsToSection def.pathConfig}
|
||
'';
|
||
};
|
||
|
||
mountToUnit = def:
|
||
{ inherit (def) name aliases wantedBy requiredBy upheldBy enable overrideStrategy;
|
||
text = commonUnitText def ''
|
||
[Mount]
|
||
${attrsToSection def.mountConfig}
|
||
'';
|
||
};
|
||
|
||
automountToUnit = def:
|
||
{ inherit (def) name aliases wantedBy requiredBy upheldBy enable overrideStrategy;
|
||
text = commonUnitText def ''
|
||
[Automount]
|
||
${attrsToSection def.automountConfig}
|
||
'';
|
||
};
|
||
|
||
sliceToUnit = def:
|
||
{ inherit (def) name aliases wantedBy requiredBy upheldBy enable overrideStrategy;
|
||
text = commonUnitText def ''
|
||
[Slice]
|
||
${attrsToSection def.sliceConfig}
|
||
'';
|
||
};
|
||
|
||
# Create a directory that contains systemd definition files from an attrset
|
||
# that contains the file names as keys and the content as values. The values
|
||
# in that attrset are determined by the supplied format.
|
||
definitions = directoryName: format: definitionAttrs:
|
||
let
|
||
listOfDefinitions = mapAttrsToList
|
||
(name: format.generate "${name}.conf")
|
||
definitionAttrs;
|
||
in
|
||
pkgs.runCommand directoryName { } ''
|
||
mkdir -p $out
|
||
${(concatStringsSep "\n"
|
||
(map (pkg: "cp ${pkg} $out/${pkg.name}") listOfDefinitions)
|
||
)}
|
||
'';
|
||
|
||
# The maximum number of characters allowed in a GPT partition label. This
|
||
# limit is specified by UEFI and enforced by systemd-repart.
|
||
# Corresponds to GPT_LABEL_MAX from systemd's gpt.h.
|
||
GPTMaxLabelLength = 36;
|
||
|
||
}
|