#!perl -w
-# Copyright (C) 2020 all contributors <meta@public-inbox.org>
+# Copyright (C) 2020-2021 all contributors <meta@public-inbox.org>
# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
use strict;
use v5.10.1;
-use Socket qw(AF_UNIX SOCK_STREAM pack_sockaddr_un);
+use Socket qw(AF_UNIX SOCK_SEQPACKET MSG_EOR pack_sockaddr_un);
+use PublicInbox::CmdIPC4;
+my $narg = 5;
+my $sock;
+my $recv_cmd = PublicInbox::CmdIPC4->can('recv_cmd4');
+my $send_cmd = PublicInbox::CmdIPC4->can('send_cmd4') // do {
+ require PublicInbox::Spawn; # takes ~50ms even if built *sigh*
+ $recv_cmd = PublicInbox::Spawn->can('recv_cmd4');
+ PublicInbox::Spawn->can('send_cmd4');
+};
-if (eval { require IO::FDPass; 1 }) { # use daemon to reduce load time
+my @orig_pid;
+my $exec_cmd = sub {
+ my ($fds, $argc, @argv) = @_;
+ die "BUG: already exec-ed\n" if @orig_pid;
+ @orig_pid = ($$);
+ require POSIX; # WNOHANG
+ my @old = (*STDIN{IO}, *STDOUT{IO}, *STDERR{IO});
+ my @rdr;
+ for my $fd (@$fds) {
+ open(my $tmpfh, '+<&=', $fd) or die "open +<&=$fd: $!";
+ push @rdr, shift(@old), $tmpfh;
+ }
+ my $pid = fork // die "fork: $!";
+ if ($pid == 0) {
+ POSIX::setsid() > 0 or die "setsid: $!";
+ return; # continue $recv_cmd in background
+ }
+ my %env = map { split(/=/, $_, 2) } splice(@argv, $argc);
+ while (my ($old_io, $tmpfh) = splice(@rdr, 0, 2)) {
+ open $old_io, '+<&', $tmpfh or die "open +<&=: $!";
+ }
+ @ENV{keys %env} = values %env;
+ exec(@argv);
+ warn "exec: @argv: $!\n";
+ POSIX::_exit(1);
+};
+
+if ($send_cmd && eval {
my $path = do {
my $runtime_dir = ($ENV{XDG_RUNTIME_DIR} // '') . '/lei';
if ($runtime_dir eq '/lei') {
require File::Path;
File::Path::mkpath($runtime_dir, 0, 0700);
}
- "$runtime_dir/sock";
+ "$runtime_dir/$narg.seq.sock";
};
my $addr = pack_sockaddr_un($path);
- socket(my $sock, AF_UNIX, SOCK_STREAM, 0) or die "socket: $!";
+ socket($sock, AF_UNIX, SOCK_SEQPACKET, 0) or die "socket: $!";
unless (connect($sock, $addr)) { # start the daemon if not started
- my $err = $! + 0;
- my $env = { PERL5LIB => join(':', @INC) };
- my $cmd = [ $^X, qw[-MPublicInbox::LEI
+ local $ENV{PERL5LIB} = join(':', @INC);
+ open(my $daemon, '-|', $^X, qw[-MPublicInbox::LEI
-E PublicInbox::LEI::lazy_start(@ARGV)],
- $path, $err ];
- require PublicInbox::Spawn;
- waitpid(PublicInbox::Spawn::spawn($cmd, $env), 0);
- warn "lei-daemon exited with \$?=$?\n" if $?;
+ $path, $! + 0, $narg) or die "popen: $!";
+ while (<$daemon>) { warn $_ } # EOF when STDERR is redirected
+ close($daemon) or warn <<"";
+lei-daemon could not start, exited with \$?=$?
# try connecting again anyways, unlink+bind may be racy
- connect($sock, $addr) or die
- "connect($path): $! (after attempted daemon start)";
- }
- require Cwd;
- my $cwd = Cwd::fastcwd() // die "fastcwd: $!";
- my $pwd = $ENV{PWD} // '';
- if ($pwd eq $cwd) { # likely, all good
- } elsif ($pwd) { # prefer ENV{PWD} if it's a symlink to real cwd
- my @st_cwd = stat($cwd) or die "stat(cwd=$cwd): $!\n";
- my @st_pwd = stat($pwd);
- # make sure st_dev/st_ino match for {PWD} to be valid
- $pwd = $cwd if (!@st_pwd || $st_pwd[1] != $st_cwd[1] ||
- $st_pwd[0] != $st_cwd[0]);
- } else {
- $pwd = $cwd;
+ connect($sock, $addr) or die <<"";
+connect($path): $! (after attempted daemon start)
+Falling back to (slow) one-shot mode
+
}
- local $ENV{PWD} = $pwd;
- my $buf = "$$\0\0>" . join("]\0[", @ARGV) . "\0\0>";
- while (my ($k, $v) = each %ENV) { $buf .= "$k=$v\0" }
+ # (Socket::MsgHdr|Inline::C), $sock are all available:
+ open my $dh, '<', '.' or die "open(.) $!";
+ my $buf = join("\0", scalar(@ARGV), @ARGV);
+ while (my ($k, $v) = each %ENV) { $buf .= "\0$k=$v" }
$buf .= "\0\0";
- select $sock;
- $| = 1; # unbuffer selected $sock
- IO::FDPass::send(fileno($sock), $_) for (0..2);
- print $sock $buf or die "print(sock, buf): $!";
- while ($buf = <$sock>) {
- $buf =~ /\Aexit=([0-9]+)\n\z/ and exit($1 + 0);
- die $buf;
+ my $n = $send_cmd->($sock, [0, 1, 2, fileno($dh)], $buf, MSG_EOR);
+ if (!$n) {
+ die "sendmsg: $! (check RLIMIT_NOFILE)\n" if $!{ETOOMANYREFS};
+ die "sendmsg: $!\n";
+ }
+ 1;
+}) { # connected and request sent to lei-daemon, wait for responses or EOF
+ my $x_it_code = 0;
+ while (1) {
+ my (@fds) = $recv_cmd->($sock, my $buf, 4096 * 33);
+ if (scalar(@fds) == 1 && !defined($fds[0])) {
+ next if $!{EINTR};
+ last if $!{ECONNRESET};
+ die "recvmsg: $!";
+ }
+ last if $buf eq '';
+ if ($buf =~ /\Aexec (.+)\z/) {
+ $exec_cmd->(\@fds, split(/\0/, $1));
+ } elsif ($buf eq '-WINCH') {
+ kill($buf, @orig_pid); # for MUA
+ } elsif ($buf =~ /\Ax_it ([0-9]+)\z/) {
+ $x_it_code = $1 + 0;
+ last;
+ } elsif ($buf =~ /\Achild_error ([0-9]+)\z/) {
+ $x_it_code = $1 + 0;
+ } else {
+ die $buf;
+ }
+ }
+ if (my $sig = ($x_it_code & 127)) {
+ kill $sig, $$;
+ sleep(1) while 1;
}
-} else { # for systems lacking IO::FDPass
+ exit($x_it_code >> 8);
+} else { # for systems lacking Socket::MsgHdr or Inline::C
+ warn $@ if $@;
require PublicInbox::LEI;
PublicInbox::LEI::oneshot(__PACKAGE__);
}