diff options
Diffstat (limited to 'nixos/lib/systemd-lib.nix')
| -rw-r--r-- | nixos/lib/systemd-lib.nix | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/nixos/lib/systemd-lib.nix b/nixos/lib/systemd-lib.nix index ab166d7327c..a472d97f5cc 100644 --- a/nixos/lib/systemd-lib.nix +++ b/nixos/lib/systemd-lib.nix @@ -5,6 +5,7 @@ with lib; let cfg = config.systemd; lndir = "${pkgs.buildPackages.xorg.lndir}/bin/lndir"; + systemd = cfg.package; in rec { shellEscape = s: (replaceChars [ "\\" ] [ "\\\\" ] s); @@ -235,4 +236,205 @@ in rec { ''} ''; # */ + makeJobScript = name: text: + let + scriptName = replaceChars [ "\\" "@" ] [ "-" "_" ] (shellEscape name); + out = (pkgs.writeShellScriptBin scriptName '' + set -e + ${text} + '').overrideAttrs (_: { + # The derivation name is different from the script file name + # to keep the script file name short to avoid cluttering logs. + name = "unit-script-${scriptName}"; + }); + in "${out}/bin/${scriptName}"; + + unitConfig = { config, options, ... }: { + config = { + unitConfig = + optionalAttrs (config.requires != []) + { Requires = toString config.requires; } + // optionalAttrs (config.wants != []) + { Wants = toString config.wants; } + // optionalAttrs (config.after != []) + { After = toString config.after; } + // optionalAttrs (config.before != []) + { Before = toString config.before; } + // optionalAttrs (config.bindsTo != []) + { BindsTo = toString config.bindsTo; } + // optionalAttrs (config.partOf != []) + { PartOf = toString config.partOf; } + // optionalAttrs (config.conflicts != []) + { Conflicts = toString config.conflicts; } + // optionalAttrs (config.requisite != []) + { Requisite = toString config.requisite; } + // optionalAttrs (config.restartTriggers != []) + { X-Restart-Triggers = toString config.restartTriggers; } + // optionalAttrs (config.reloadTriggers != []) + { X-Reload-Triggers = toString config.reloadTriggers; } + // optionalAttrs (config.description != "") { + Description = config.description; } + // optionalAttrs (config.documentation != []) { + Documentation = toString config.documentation; } + // optionalAttrs (config.onFailure != []) { + OnFailure = toString config.onFailure; } + // optionalAttrs (options.startLimitIntervalSec.isDefined) { + StartLimitIntervalSec = toString config.startLimitIntervalSec; + } // optionalAttrs (options.startLimitBurst.isDefined) { + StartLimitBurst = toString config.startLimitBurst; + }; + }; + }; + + serviceConfig = { name, config, ... }: { + config = mkMerge + [ { # Default path for systemd services. Should be quite minimal. + path = mkAfter + [ pkgs.coreutils + pkgs.findutils + pkgs.gnugrep + pkgs.gnused + systemd + ]; + environment.PATH = "${makeBinPath config.path}:${makeSearchPathOutput "bin" "sbin" config.path}"; + } + (mkIf (config.preStart != "") + { serviceConfig.ExecStartPre = + [ (makeJobScript "${name}-pre-start" config.preStart) ]; + }) + (mkIf (config.script != "") + { serviceConfig.ExecStart = + makeJobScript "${name}-start" config.script + " " + config.scriptArgs; + }) + (mkIf (config.postStart != "") + { serviceConfig.ExecStartPost = + [ (makeJobScript "${name}-post-start" config.postStart) ]; + }) + (mkIf (config.reload != "") + { serviceConfig.ExecReload = + makeJobScript "${name}-reload" config.reload; + }) + (mkIf (config.preStop != "") + { serviceConfig.ExecStop = + makeJobScript "${name}-pre-stop" config.preStop; + }) + (mkIf (config.postStop != "") + { serviceConfig.ExecStopPost = + makeJobScript "${name}-post-stop" config.postStop; + }) + ]; + }; + + mountConfig = { config, ... }: { + config = { + mountConfig = + { What = config.what; + Where = config.where; + } // optionalAttrs (config.type != "") { + Type = config.type; + } // optionalAttrs (config.options != "") { + Options = config.options; + }; + }; + }; + + automountConfig = { config, ... }: { + config = { + automountConfig = + { Where = config.where; + }; + }; + }; + + commonUnitText = def: '' + [Unit] + ${attrsToSection def.unitConfig} + ''; + + targetToUnit = name: def: + { inherit (def) aliases wantedBy requiredBy enable; + text = + '' + [Unit] + ${attrsToSection def.unitConfig} + ''; + }; + + serviceToUnit = name: def: + { inherit (def) aliases wantedBy requiredBy enable; + text = commonUnitText def + + '' + [Service] + ${let env = cfg.globalEnvironment // def.environment; + in concatMapStrings (n: + let s = optionalString (env.${n} != null) + "Environment=${builtins.toJSON "${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 ‘${n}’ in systemd service ‘${name}.service’ is too long." else s) (attrNames env)} + ${if def.reloadIfChanged then '' + X-ReloadIfChanged=true + '' else if !def.restartIfChanged then '' + X-RestartIfChanged=false + '' else ""} + ${optionalString (!def.stopIfChanged) "X-StopIfChanged=false"} + ${attrsToSection def.serviceConfig} + ''; + }; + + socketToUnit = name: def: + { inherit (def) aliases wantedBy requiredBy enable; + text = commonUnitText def + + '' + [Socket] + ${attrsToSection def.socketConfig} + ${concatStringsSep "\n" (map (s: "ListenStream=${s}") def.listenStreams)} + ${concatStringsSep "\n" (map (s: "ListenDatagram=${s}") def.listenDatagrams)} + ''; + }; + + timerToUnit = name: def: + { inherit (def) aliases wantedBy requiredBy enable; + text = commonUnitText def + + '' + [Timer] + ${attrsToSection def.timerConfig} + ''; + }; + + pathToUnit = name: def: + { inherit (def) aliases wantedBy requiredBy enable; + text = commonUnitText def + + '' + [Path] + ${attrsToSection def.pathConfig} + ''; + }; + + mountToUnit = name: def: + { inherit (def) aliases wantedBy requiredBy enable; + text = commonUnitText def + + '' + [Mount] + ${attrsToSection def.mountConfig} + ''; + }; + + automountToUnit = name: def: + { inherit (def) aliases wantedBy requiredBy enable; + text = commonUnitText def + + '' + [Automount] + ${attrsToSection def.automountConfig} + ''; + }; + + sliceToUnit = name: def: + { inherit (def) aliases wantedBy requiredBy enable; + text = commonUnitText def + + '' + [Slice] + ${attrsToSection def.sliceConfig} + ''; + }; } |