291 lines
8.4 KiB
Nix
291 lines
8.4 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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with import ../boot/systemd-unit-options.nix { inherit config lib; };
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let
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userExists = u:
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(u == "") || any (uu: uu.name == u) (attrValues config.users.extraUsers);
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groupExists = g:
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(g == "") || any (gg: gg.name == g) (attrValues config.users.extraGroups);
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makeJobScript = name: content: "${pkgs.writeScriptBin name content}/bin/${name}";
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# From a job description, generate an systemd unit file.
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makeUnit = job:
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let
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hasMain = job.script != "" || job.exec != "";
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env = job.environment;
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preStartScript = makeJobScript "${job.name}-pre-start"
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''
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#! ${pkgs.stdenv.shell} -e
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${job.preStart}
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'';
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startScript = makeJobScript "${job.name}-start"
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''
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#! ${pkgs.stdenv.shell} -e
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${if job.script != "" then job.script else ''
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exec ${job.exec}
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''}
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'';
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postStartScript = makeJobScript "${job.name}-post-start"
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''
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#! ${pkgs.stdenv.shell} -e
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${job.postStart}
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'';
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preStopScript = makeJobScript "${job.name}-pre-stop"
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''
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#! ${pkgs.stdenv.shell} -e
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${job.preStop}
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'';
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postStopScript = makeJobScript "${job.name}-post-stop"
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''
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#! ${pkgs.stdenv.shell} -e
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${job.postStop}
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'';
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in {
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inherit (job) description requires before partOf environment path restartIfChanged unitConfig;
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after =
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(if job.startOn == "stopped udevtrigger" then [ "systemd-udev-settle.service" ] else
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if job.startOn == "started udev" then [ "systemd-udev.service" ] else
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if job.startOn == "started network-interfaces" then [ "network-interfaces.target" ] else
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if job.startOn == "started networking" then [ "network.target" ] else
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if job.startOn == "ip-up" then [] else
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if job.startOn == "" || job.startOn == "startup" then [] else
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builtins.trace "Warning: job ‘${job.name}’ has unknown startOn value ‘${job.startOn}’." []
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) ++ job.after;
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wants =
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(if job.startOn == "stopped udevtrigger" then [ "systemd-udev-settle.service" ] else []
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) ++ job.wants;
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wantedBy =
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(if job.startOn == "" then [] else
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if job.startOn == "ip-up" then [ "ip-up.target" ] else
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[ "multi-user.target" ]) ++ job.wantedBy;
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serviceConfig =
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job.serviceConfig
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// optionalAttrs (job.preStart != "" && (job.script != "" || job.exec != ""))
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{ ExecStartPre = preStartScript; }
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// optionalAttrs (job.preStart != "" && job.script == "" && job.exec == "")
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{ ExecStart = preStartScript; }
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// optionalAttrs (job.script != "" || job.exec != "")
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{ ExecStart = startScript; }
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// optionalAttrs (job.postStart != "")
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{ ExecStartPost = postStartScript; }
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// optionalAttrs (job.preStop != "")
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{ ExecStop = preStopScript; }
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// optionalAttrs (job.postStop != "")
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{ ExecStopPost = postStopScript; }
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// (if job.script == "" && job.exec == "" then { Type = "oneshot"; RemainAfterExit = true; } else
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if job.daemonType == "fork" || job.daemonType == "daemon" then { Type = "forking"; GuessMainPID = true; } else
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if job.daemonType == "none" then { } else
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throw "invalid daemon type `${job.daemonType}'")
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// optionalAttrs (!job.task && !(job.script == "" && job.exec == "") && job.respawn)
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{ Restart = "always"; }
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// optionalAttrs job.task
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{ Type = "oneshot"; RemainAfterExit = false; };
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};
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jobOptions = serviceOptions // {
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name = mkOption {
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# !!! The type should ensure that this could be a filename.
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type = types.str;
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example = "sshd";
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description = ''
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Name of the job, mapped to the systemd unit
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<literal><replaceable>name</replaceable>.service</literal>.
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'';
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};
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startOn = mkOption {
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#type = types.str;
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default = "";
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description = ''
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The Upstart event that triggers this job to be started. Some
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are mapped to systemd dependencies; otherwise you will get a
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warning. If empty, the job will not start automatically.
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'';
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};
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stopOn = mkOption {
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type = types.str;
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default = "starting shutdown";
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description = ''
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Ignored; this was the Upstart event that triggers this job to be stopped.
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'';
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};
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postStart = mkOption {
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type = types.lines;
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default = "";
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description = ''
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Shell commands executed after the job is started (i.e. after
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the job's main process is started), but before the job is
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considered “running”.
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'';
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};
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preStop = mkOption {
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type = types.lines;
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default = "";
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description = ''
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Shell commands executed before the job is stopped
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(i.e. before systemd kills the job's main process). This can
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be used to cleanly shut down a daemon.
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'';
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};
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postStop = mkOption {
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type = types.lines;
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default = "";
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description = ''
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Shell commands executed after the job has stopped
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(i.e. after the job's main process has terminated).
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'';
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};
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exec = mkOption {
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type = types.str;
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default = "";
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description = ''
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Command to start the job's main process. If empty, the
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job has no main process, but can still have pre/post-start
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and pre/post-stop scripts, and is considered “running”
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until it is stopped.
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'';
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};
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respawn = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whether to restart the job automatically if its process
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ends unexpectedly.
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'';
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};
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task = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether this job is a task rather than a service. Tasks
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are executed only once, while services are restarted when
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they exit.
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'';
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};
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daemonType = mkOption {
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type = types.str;
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default = "none";
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description = ''
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Determines how systemd detects when a daemon should be
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considered “running”. The value <literal>none</literal> means
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that the daemon is considered ready immediately. The value
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<literal>fork</literal> means that the daemon will fork once.
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The value <literal>daemon</literal> means that the daemon will
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fork twice. The value <literal>stop</literal> means that the
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daemon will raise the SIGSTOP signal to indicate readiness.
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'';
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};
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setuid = mkOption {
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type = types.addCheck types.str userExists;
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default = "";
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description = ''
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Run the daemon as a different user.
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'';
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};
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setgid = mkOption {
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type = types.addCheck types.str groupExists;
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default = "";
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description = ''
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Run the daemon as a different group.
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'';
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};
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path = mkOption {
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default = [];
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description = ''
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Packages added to the job's <envar>PATH</envar> environment variable.
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Both the <filename>bin</filename> and <filename>sbin</filename>
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subdirectories of each package are added.
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'';
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};
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};
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upstartJob = { name, config, ... }: {
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options = {
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unit = mkOption {
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default = makeUnit config;
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description = "Generated definition of the systemd unit corresponding to this job.";
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};
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};
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config = {
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# The default name is the name extracted from the attribute path.
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name = mkDefault name;
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};
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};
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in
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{
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###### interface
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options = {
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jobs = mkOption {
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default = {};
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description = ''
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This option is a legacy method to define system services,
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dating from the era where NixOS used Upstart instead of
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systemd. You should use <option>systemd.services</option>
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instead. Services defined using <option>jobs</option> are
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mapped automatically to <option>systemd.services</option>, but
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may not work perfectly; in particular, most
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<option>startOn</option> conditions are not supported.
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'';
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type = types.loaOf types.optionSet;
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options = [ jobOptions upstartJob ];
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};
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};
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###### implementation
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config = {
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systemd.services =
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flip mapAttrs' config.jobs (name: job:
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nameValuePair job.name job.unit);
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};
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}
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