308 lines
7.8 KiB
Nix
308 lines
7.8 KiB
Nix
{ config, pkgs, ... }:
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with pkgs.lib;
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with import ../boot/systemd-unit-options.nix { inherit config pkgs; };
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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 = config.system.upstartEnvironment // job.environment;
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preStartScript = makeJobScript "${job.name}-pre-start.sh"
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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.sh"
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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.sh"
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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.sh"
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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.sh"
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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 wants before environment path;
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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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[]) ++ job.after;
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wantedBy =
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(if job.startOn == "" then [ ] else [ "multi-user.target" ]) ++ job.wantedBy;
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serviceConfig =
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''
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${job.serviceConfig}
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${optionalString (job.preStart != "" && (job.script != "" || job.exec != "")) ''
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ExecStartPre=${preStartScript}
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''}
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${optionalString (job.preStart != "" && job.script == "" && job.exec == "") ''
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ExecStart=${preStartScript}
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''}
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${optionalString (job.script != "" || job.exec != "") ''
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ExecStart=${startScript}
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''}
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${optionalString (job.postStart != "") ''
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ExecStartPost=${postStartScript}
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''}
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${optionalString (job.preStop != "") ''
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ExecStop=${preStopScript}
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''}
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${optionalString (job.postStop != "") ''
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ExecStopPost=${postStopScript}
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''}
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${if job.script == "" && job.exec == "" then "Type=oneshot\nRemainAfterExit=true" else
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if job.daemonType == "fork" then "Type=forking\nGuessMainPID=true" else
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if job.daemonType == "none" then "" else
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throw "invalid daemon type `${job.daemonType}'"}
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${optionalString (!job.task && job.respawn) "Restart=always"}
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'';
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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.string;
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example = "sshd";
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description = ''
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Name of the Upstart job.
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'';
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};
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startOn = mkOption {
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# !!! Re-enable this once we're on Upstart >= 0.6.
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#type = types.string;
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default = "";
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description = ''
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The Upstart event that triggers this job to be started.
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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.string;
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default = "starting shutdown";
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description = ''
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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.string;
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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.string;
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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 Upstart 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.string;
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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.string;
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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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restartIfChanged = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whether the job should be restarted if it has changed after a
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NixOS configuration switch.
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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.string;
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default = "none";
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description = ''
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Determines how Upstart 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.string;
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check = 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.string;
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check = 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 = mkDefaultValue 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 defines the system jobs started and managed by the
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Upstart daemon.
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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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system.upstartEnvironment = mkOption {
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type = types.attrs;
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default = {};
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example = { TZ = "CET"; };
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description = ''
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Environment variables passed to <emphasis>all</emphasis> Upstart jobs.
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'';
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};
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};
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###### implementation
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config = {
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system.build.upstart = "/no-upstart";
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boot.systemd.services =
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flip mapAttrs' config.jobs (name: job:
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nameValuePair "${job.name}.service" job.unit);
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};
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}
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