128 lines
3.5 KiB
Nix
128 lines
3.5 KiB
Nix
{ lib, pkgs, ... }:
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with lib;
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let
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makeScript = name: service: pkgs.writeScript "${name}-runner"
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''
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#! ${pkgs.perl.withPackages (p: [ p.FileSlurp ])}/bin/perl -w
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use File::Slurp;
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sub run {
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my ($cmd) = @_;
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my @args = ();
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while ($cmd =~ /([^ \t\n']+)|(\'([^'])\')\s*/g) {
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push @args, $1;
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}
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my $prog;
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if (substr($args[0], 0, 1) eq "@") {
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$prog = substr($args[0], 1);
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shift @args;
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} else {
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$prog = $args[0];
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}
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my $pid = fork;
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if ($pid == 0) {
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setpgrp; # don't receive SIGINT etc. from terminal
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exec { $prog } @args;
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die "failed to exec $prog\n";
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} elsif (!defined $pid) {
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die "failed to fork: $!\n";
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}
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return $pid;
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};
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sub run_wait {
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my ($cmd) = @_;
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my $pid = run $cmd;
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die if waitpid($pid, 0) != $pid;
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return $?;
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};
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# Set the environment. FIXME: escaping.
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foreach my $key (keys %ENV) {
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next if $key eq 'LOCALE_ARCHIVE';
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delete $ENV{$key};
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}
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${concatStrings (mapAttrsToList (n: v: ''
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$ENV{'${n}'} = '${v}';
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'') service.environment)}
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# Run the ExecStartPre program. FIXME: this could be a list.
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my $preStart = <<END_CMD;
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${concatStringsSep "\n" (service.serviceConfig.ExecStartPre or [])}
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END_CMD
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if (defined $preStart && $preStart ne "\n") {
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print STDERR "running ExecStartPre: $preStart\n";
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my $res = run_wait $preStart;
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die "$0: ExecStartPre failed with status $res\n" if $res;
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};
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# Run the ExecStart program.
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my $cmd = <<END_CMD;
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${service.serviceConfig.ExecStart}
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END_CMD
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print STDERR "running ExecStart: $cmd\n";
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my $mainPid = run $cmd;
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$ENV{'MAINPID'} = $mainPid;
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# Catch SIGINT, propagate to the main program.
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sub intHandler {
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print STDERR "got SIGINT, stopping service...\n";
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kill 'INT', $mainPid;
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};
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$SIG{'INT'} = \&intHandler;
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$SIG{'QUIT'} = \&intHandler;
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# Run the ExecStartPost program.
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my $postStart = <<END_CMD;
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${concatStringsSep "\n" (service.serviceConfig.ExecStartPost or [])}
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END_CMD
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if (defined $postStart && $postStart ne "\n") {
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print STDERR "running ExecStartPost: $postStart\n";
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my $res = run_wait $postStart;
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die "$0: ExecStartPost failed with status $res\n" if $res;
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}
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# Wait for the main program to exit.
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die if waitpid($mainPid, 0) != $mainPid;
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my $mainRes = $?;
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# Run the ExecStopPost program.
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my $postStop = <<END_CMD;
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${service.serviceConfig.ExecStopPost or ""}
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END_CMD
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if (defined $postStop && $postStop ne "\n") {
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print STDERR "running ExecStopPost: $postStop\n";
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my $res = run_wait $postStop;
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die "$0: ExecStopPost failed with status $res\n" if $res;
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}
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exit($mainRes & 127 ? 255 : $mainRes << 8);
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'';
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opts = { config, name, ... }: {
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options.runner = mkOption {
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internal = true;
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description = lib.mdDoc ''
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A script that runs the service outside of systemd,
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useful for testing or for using NixOS services outside
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of NixOS.
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'';
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};
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config.runner = makeScript name config;
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};
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in
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{
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options = {
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systemd.services = mkOption {
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type = with types; attrsOf (submodule opts);
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};
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};
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}
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