2 # Copyright (C) 2020-2021 all contributors <meta@public-inbox.org>
3 # License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
6 use Socket qw(AF_UNIX SOCK_SEQPACKET MSG_EOR pack_sockaddr_un);
7 use Errno qw(EINTR ECONNRESET);
8 use PublicInbox::CmdIPC4;
11 my $recv_cmd = PublicInbox::CmdIPC4->can('recv_cmd4');
12 my $send_cmd = PublicInbox::CmdIPC4->can('send_cmd4') // do {
13 require PublicInbox::Spawn; # takes ~50ms even if built *sigh*
14 $recv_cmd = PublicInbox::Spawn->can('recv_cmd4');
15 PublicInbox::Spawn->can('send_cmd4');
20 my $flags = $sig ? POSIX::WNOHANG() : 0;
21 while (waitpid(-1, $flags) > 0) {}
25 my ($fds, $argc, @argv) = @_;
26 my @m = (*STDIN{IO}, '<&=', *STDOUT{IO}, '>&=', *STDERR{IO}, '>&=');
29 my ($old_io, $mode) = splice(@m, 0, 2);
30 open(my $tmpfh, $mode, $fd) or die "open $mode$fd: $!";
31 push @rdr, $old_io, $mode, $tmpfh;
33 require POSIX; # WNOHANG
34 $SIG{CHLD} = \&sigchld;
35 my $pid = fork // die "fork: $!";
37 my %env = map { split(/=/, $_, 2) } splice(@argv, $argc);
38 while (my ($old_io, $mode, $tmpfh) = splice(@rdr, 0, 3)) {
39 open $old_io, $mode, $tmpfh or die "open $mode: $!";
43 die "exec: @argv: $!";
47 if ($send_cmd && eval {
49 my $runtime_dir = ($ENV{XDG_RUNTIME_DIR} // '') . '/lei';
50 if ($runtime_dir eq '/lei') {
52 $runtime_dir = File::Spec->tmpdir."/lei-$<";
54 unless (-d $runtime_dir) {
56 File::Path::mkpath($runtime_dir, 0, 0700);
58 "$runtime_dir/$narg.seq.sock";
60 my $addr = pack_sockaddr_un($path);
61 socket($sock, AF_UNIX, SOCK_SEQPACKET, 0) or die "socket: $!";
62 unless (connect($sock, $addr)) { # start the daemon if not started
63 local $ENV{PERL5LIB} = join(':', @INC);
64 open(my $daemon, '-|', $^X, qw[-MPublicInbox::LEI
65 -E PublicInbox::LEI::lazy_start(@ARGV)],
66 $path, $! + 0, $narg) or die "popen: $!";
67 while (<$daemon>) { warn $_ } # EOF when STDERR is redirected
68 close($daemon) or warn <<"";
69 lei-daemon could not start, exited with \$?=$?
71 # try connecting again anyways, unlink+bind may be racy
72 connect($sock, $addr) or die <<"";
73 connect($path): $! (after attempted daemon start)
74 Falling back to (slow) one-shot mode
78 $pwd = $ENV{PWD} // '';
79 my $cwd = Cwd::fastcwd() // die "fastcwd(PWD=$pwd): $!";
80 if ($pwd ne $cwd) { # prefer ENV{PWD} if it's a symlink to real cwd
81 my @st_cwd = stat($cwd) or die "stat(cwd=$cwd): $!";
82 my @st_pwd = stat($pwd); # PWD invalid, use cwd
83 # make sure st_dev/st_ino match for {PWD} to be valid
84 $pwd = $cwd if (!@st_pwd || $st_pwd[1] != $st_cwd[1] ||
85 $st_pwd[0] != $st_cwd[0]);
90 }) { # (Socket::MsgHdr|Inline::C), $sock, $pwd are all available:
92 my $buf = join("\0", scalar(@ARGV), @ARGV);
93 while (my ($k, $v) = each %ENV) { $buf .= "\0$k=$v" }
95 $send_cmd->($sock, [ 0, 1, 2 ], $buf, MSG_EOR);
96 $SIG{TERM} = $SIG{INT} = $SIG{QUIT} = sub {
97 my ($sig) = @_; # 'TERM', not an integer :<
98 $SIG{$sig} = 'DEFAULT';
99 kill($sig, $$); # exit($signo + 128)
103 my (@fds) = $recv_cmd->($sock, $buf, 4096 * 33);
104 if (scalar(@fds) == 1 && !defined($fds[0])) {
105 last if $! == ECONNRESET;
110 if ($buf =~ /\Ax_it ([0-9]+)\z/) {
113 } elsif ($buf =~ /\Aexec (.+)\z/) {
114 exec_cmd(\@fds, split(/\0/, $1));
121 if (my $sig = ($x_it_code & 127)) {
125 exit($x_it_code >> 8);
126 } else { # for systems lacking Socket::MsgHdr or Inline::C
128 require PublicInbox::LEI;
129 PublicInbox::LEI::oneshot(__PACKAGE__);