119 lines
3.6 KiB
Nix
119 lines
3.6 KiB
Nix
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{ config, lib, pkgs }:
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with lib;
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let cfg = config.systemd; in
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rec {
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shellEscape = s: (replaceChars [ "\\" ] [ "\\\\" ] s);
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makeUnit = name: unit:
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let
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pathSafeName = lib.replaceChars ["@" ":" "\\"] ["-" "-" "-"] name;
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in
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if unit.enable then
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pkgs.runCommand "unit-${pathSafeName}" { preferLocalBuild = true; inherit (unit) text; }
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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-${pathSafeName}-disabled" { preferLocalBuild = true; }
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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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generateUnits = type: units: upstreamUnits: upstreamWants:
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pkgs.runCommand "${type}-units" { preferLocalBuild = true; } ''
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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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for i in ${toString cfg.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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ln -s $fn $out/
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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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mkdir $out/$fn.d
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ln -s $i/$fn $out/$fn.d/overrides.conf
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fi
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else
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ln -fs $i/$fn $out/
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fi
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done
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# Created .wants and .requires symlinks from the wantedBy and
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# requiredBy options.
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${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 rescue.target $out/kbrequest.target
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mkdir -p $out/getty.target.wants/
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ln -s ../autovt@tty1.service $out/getty.target.wants/
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ln -s ../local-fs.target ../remote-fs.target ../network.target \
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../nss-lookup.target ../nss-user-lookup.target ../swap.target \
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$out/multi-user.target.wants/
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''}
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''; # */
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}
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