240 lines
7.9 KiB
Nix
240 lines
7.9 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 = "${pkgs.buildPackages.xorg.lndir}/bin/lndir";
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in rec {
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shellEscape = s: (replaceChars [ "\\" ] [ "\\\\" ] s);
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mkPathSafeName = lib.replaceChars ["@" ":" "\\" "[" "]"] ["-" "-" "-" "" ""];
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# a type for options that take a unit name
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unitNameType = types.strMatching "[a-zA-Z0-9@%:_.\\-]+[.](service|socket|device|mount|automount|swap|target|path|timer|scope|slice)";
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makeUnit = name: unit:
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if unit.enable then
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pkgs.runCommand "unit-${mkPathSafeName name}"
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{ preferLocalBuild = true;
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allowSubstitutes = false;
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inherit (unit) text;
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}
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''
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mkdir -p $out
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echo -n "$text" > $out/${shellEscape 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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mkdir -p $out
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ln -s /dev/null $out/${shellEscape 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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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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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 = generateUnits' true;
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generateUnits' = allowCollisions: type: units: upstreamUnits: upstreamWants:
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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 ${toString upstreamUnits}; do
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fn=${cfg.package}/example/systemd/${type}/$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 ${toString upstreamWants}; do
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fn=${cfg.package}/example/systemd/${type}/$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 cfg.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 $i/etc/systemd/${type}/* $i/lib/systemd/${type}/*; 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 all units defined by systemd.units. If these are also
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# provided by 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 ${toString (mapAttrsToList (n: v: v.unit) units)}; do
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fn=$(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 $out/
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fi
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done
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# Create service aliases from aliases option.
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${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) 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) 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) 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 $out/getty.target.wants/
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ln -s ../local-fs.target ../remote-fs.target \
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../nss-lookup.target ../nss-user-lookup.target ../swap.target \
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$out/multi-user.target.wants/
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''}
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''; # */
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}
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