470 lines
16 KiB
Nix
470 lines
16 KiB
Nix
{ config, lib, pkgs }:
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with lib;
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let
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cfg = config.systemd;
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lndir = "${pkgs.buildPackages.xorg.lndir}/bin/lndir";
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systemd = cfg.package;
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in rec {
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shellEscape = s: (replaceStrings [ "\\" ] [ "\\\\" ] s);
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mkPathSafeName = lib.replaceStrings ["@" ":" "\\" "[" "]"] ["-" "-" "-" "" ""];
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# a type for options that take a unit name
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unitNameType = types.strMatching "[a-zA-Z0-9@%:_.\\-]+[.](service|socket|device|mount|automount|swap|target|path|timer|scope|slice)";
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makeUnit = name: unit:
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if unit.enable then
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pkgs.runCommand "unit-${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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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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isPort = i: i >= 0 && i <= 65535;
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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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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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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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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 builtins.trace (concatStringsSep "\n" errors) false;
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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 ${toString (mapAttrsToList
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(n: v: v.unit)
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(lib.filterAttrs (n: v: (attrByPath [ "overrideStrategy" ] "asDropinIfExists" v) == "asDropinIfExists") units))}; do
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fn=$(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 ${toString (mapAttrsToList
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(n: v: v.unit)
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(lib.filterAttrs (n: v: v ? overrideStrategy && v.overrideStrategy == "asDropin") units))}; do
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fn=$(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 and .requires symlinks from the wantedBy 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}.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/${scriptName}";
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unitConfig = { config, name, options, ... }: {
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config = {
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unitConfig =
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optionalAttrs (config.requires != [])
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{ Requires = toString config.requires; }
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// optionalAttrs (config.wants != [])
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{ Wants = toString config.wants; }
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// optionalAttrs (config.after != [])
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{ After = toString config.after; }
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// optionalAttrs (config.before != [])
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{ Before = toString config.before; }
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// optionalAttrs (config.bindsTo != [])
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{ BindsTo = toString config.bindsTo; }
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// optionalAttrs (config.partOf != [])
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{ PartOf = toString config.partOf; }
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// optionalAttrs (config.conflicts != [])
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{ Conflicts = toString config.conflicts; }
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// optionalAttrs (config.requisite != [])
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{ Requisite = toString config.requisite; }
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// optionalAttrs (config ? restartTriggers && config.restartTriggers != [])
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{ X-Restart-Triggers = "${pkgs.writeText "X-Restart-Triggers-${name}" (toString config.restartTriggers)}"; }
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// optionalAttrs (config ? reloadTriggers && config.reloadTriggers != [])
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{ X-Reload-Triggers = "${pkgs.writeText "X-Reload-Triggers-${name}" (toString config.reloadTriggers)}"; }
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// optionalAttrs (config.description != "") {
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Description = config.description; }
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// optionalAttrs (config.documentation != []) {
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Documentation = toString config.documentation; }
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// optionalAttrs (config.onFailure != []) {
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OnFailure = toString config.onFailure; }
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// optionalAttrs (config.onSuccess != []) {
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OnSuccess = toString config.onSuccess; }
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// optionalAttrs (options.startLimitIntervalSec.isDefined) {
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StartLimitIntervalSec = toString config.startLimitIntervalSec;
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} // optionalAttrs (options.startLimitBurst.isDefined) {
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StartLimitBurst = toString config.startLimitBurst;
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};
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};
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};
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serviceConfig = { config, ... }: {
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config.environment.PATH = mkIf (config.path != []) "${makeBinPath config.path}:${makeSearchPathOutput "bin" "sbin" config.path}";
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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
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pkgs.gnugrep
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pkgs.gnused
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systemd
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];
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};
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stage1ServiceConfig = serviceConfig;
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mountConfig = { config, ... }: {
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config = {
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mountConfig =
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{ What = config.what;
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Where = config.where;
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} // optionalAttrs (config.type != "") {
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Type = config.type;
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} // optionalAttrs (config.options != "") {
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Options = config.options;
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};
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};
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};
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automountConfig = { config, ... }: {
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config = {
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automountConfig =
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{ Where = config.where;
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};
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};
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};
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commonUnitText = def: ''
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[Unit]
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${attrsToSection def.unitConfig}
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'';
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targetToUnit = name: def:
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{ inherit (def) aliases wantedBy requiredBy enable overrideStrategy;
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text =
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''
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[Unit]
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${attrsToSection def.unitConfig}
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'';
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};
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serviceToUnit = name: def:
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{ inherit (def) aliases wantedBy requiredBy enable overrideStrategy;
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text = commonUnitText def + ''
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[Service]
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'' + (let env = cfg.globalEnvironment // def.environment;
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in concatMapStrings (n:
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let s = optionalString (env.${n} != null)
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"Environment=${builtins.toJSON "${n}=${env.${n}}"}\n";
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# systemd max line length is now 1MiB
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# https://github.com/systemd/systemd/commit/e6dde451a51dc5aaa7f4d98d39b8fe735f73d2af
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in if stringLength s >= 1048576 then throw "The value of the environment variable ‘${n}’ in systemd service ‘${name}.service’ is too long." else s) (attrNames env))
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+ (if def ? reloadIfChanged && def.reloadIfChanged then ''
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X-ReloadIfChanged=true
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'' else if (def ? restartIfChanged && !def.restartIfChanged) then ''
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X-RestartIfChanged=false
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'' else "")
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+ optionalString (def ? stopIfChanged && !def.stopIfChanged) ''
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X-StopIfChanged=false
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'' + attrsToSection def.serviceConfig;
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};
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socketToUnit = name: def:
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{ inherit (def) aliases wantedBy requiredBy enable overrideStrategy;
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text = commonUnitText def +
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''
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[Socket]
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${attrsToSection def.socketConfig}
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${concatStringsSep "\n" (map (s: "ListenStream=${s}") def.listenStreams)}
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${concatStringsSep "\n" (map (s: "ListenDatagram=${s}") def.listenDatagrams)}
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'';
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};
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timerToUnit = name: def:
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{ inherit (def) aliases wantedBy requiredBy enable overrideStrategy;
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text = commonUnitText def +
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''
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[Timer]
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${attrsToSection def.timerConfig}
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'';
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};
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pathToUnit = name: def:
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{ inherit (def) aliases wantedBy requiredBy enable overrideStrategy;
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text = commonUnitText def +
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''
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[Path]
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${attrsToSection def.pathConfig}
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'';
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};
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mountToUnit = name: def:
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{ inherit (def) aliases wantedBy requiredBy enable overrideStrategy;
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text = commonUnitText def +
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''
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[Mount]
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${attrsToSection def.mountConfig}
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'';
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};
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automountToUnit = name: def:
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{ inherit (def) aliases wantedBy requiredBy enable overrideStrategy;
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text = commonUnitText def +
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''
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[Automount]
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${attrsToSection def.automountConfig}
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'';
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};
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sliceToUnit = name: def:
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{ inherit (def) aliases wantedBy requiredBy enable overrideStrategy;
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text = commonUnitText def +
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''
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[Slice]
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${attrsToSection def.sliceConfig}
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'';
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};
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# Create a directory that contains systemd definition files from an attrset
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# that contains the file names as keys and the content as values. The values
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# in that attrset are determined by the supplied format.
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definitions = directoryName: format: definitionAttrs:
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let
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listOfDefinitions = lib.mapAttrsToList
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(name: format.generate "${name}.conf")
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definitionAttrs;
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in
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pkgs.runCommand directoryName { } ''
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mkdir -p $out
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${(lib.concatStringsSep "\n"
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(map (pkg: "cp ${pkg} $out/${pkg.name}") listOfDefinitions)
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)}
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'';
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}
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