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61b7cab481
Since 03eaa48 added perl.withPackages, there is a canonical way to
create a perl interpreter from a list of libraries, for use in script
shebangs or generic build inputs. This method is declarative (what we
are doing is clear), produces short shebangs[1] and needs not to wrap
existing scripts.
Unfortunately there are a few exceptions that I've found:
1. Scripts that are calling perl with the -T switch. This makes perl
ignore PERL5LIB, which is what perl.withPackages is using to inform
the interpreter of the library paths.
2. Perl packages that depends on libraries in their own path. This
is not possible because perl.withPackages works at build time. The
workaround is to add `-I $out/${perl.libPrefix}` to the shebang.
In all other cases I propose to switch to perl.withPackages.
[1]: https://lwn.net/Articles/779997/
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 = ''
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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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