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 PublicInbox::CmdIPC4;
10 my $recv_cmd = PublicInbox::CmdIPC4->can('recv_cmd4');
11 my $send_cmd = PublicInbox::CmdIPC4->can('send_cmd4') // do {
12 require PublicInbox::Spawn; # takes ~50ms even if built *sigh*
13 $recv_cmd = PublicInbox::Spawn->can('recv_cmd4');
14 PublicInbox::Spawn->can('send_cmd4');
19 my $flags = scalar(@_) ? POSIX::WNOHANG() : 0;
20 for my $pid (keys %pids) {
21 delete($pids{$pid}) if waitpid($pid, $flags) == $pid;
26 my ($fds, $argc, @argv) = @_;
29 my @old = (*STDIN{IO}, *STDOUT{IO}, *STDERR{IO});
32 open(my $newfh, '+<&=', $fd) or die "open +<&=$fd: $!";
33 push @rdr, shift(@old), $newfh;
36 while (my ($io, $newfh) = splice(@rdr, 0, 2)) {
37 open $io, '+<&', $newfh or die "open +<&=: $!";
39 my %env = map { split(/=/, $_, 2) } splice(@argv, $argc);
40 @ENV{keys %env} = values %env;
42 warn "exec: @argv: $!\n";
45 $SIG{CHLD} = $sigchld;
46 my $pid = fork // die "fork: $!";
48 $do_exec->() if $fds->[1]; # git-credential, pager
50 # parent backgrounds on MUA
51 POSIX::setsid() > 0 or die "setsid: $!";
53 return; # continue $recv_cmd in background
58 $do_exec->(); # MUA reuses stdout
62 if ($send_cmd && eval {
64 my $runtime_dir = ($ENV{XDG_RUNTIME_DIR} // '') . '/lei';
65 die \0 if $runtime_dir eq '/dev/null/lei'; # oneshot forced
66 if ($runtime_dir eq '/lei') {
68 $runtime_dir = File::Spec->tmpdir."/lei-$<";
70 unless (-d $runtime_dir) {
72 File::Path::mkpath($runtime_dir, 0, 0700);
74 "$runtime_dir/$narg.seq.sock";
76 my $addr = pack_sockaddr_un($path);
77 socket($sock, AF_UNIX, SOCK_SEQPACKET, 0) or die "socket: $!";
78 unless (connect($sock, $addr)) { # start the daemon if not started
79 local $ENV{PERL5LIB} = join(':', @INC);
80 open(my $daemon, '-|', $^X, qw[-MPublicInbox::LEI
81 -E PublicInbox::LEI::lazy_start(@ARGV)],
82 $path, $! + 0, $narg) or die "popen: $!";
83 while (<$daemon>) { warn $_ } # EOF when STDERR is redirected
84 close($daemon) or warn <<"";
85 lei-daemon could not start, exited with \$?=$?
87 # try connecting again anyways, unlink+bind may be racy
88 connect($sock, $addr) or die <<"";
89 connect($path): $! (after attempted daemon start)
90 Falling back to (slow) one-shot mode
93 # (Socket::MsgHdr|Inline::C), $sock are all available:
94 open my $dh, '<', '.' or die "open(.) $!";
95 my $buf = join("\0", scalar(@ARGV), @ARGV);
96 while (my ($k, $v) = each %ENV) { $buf .= "\0$k=$v" }
98 my $n = $send_cmd->($sock, [0, 1, 2, fileno($dh)], $buf, MSG_EOR);
100 die "sendmsg: $! (check RLIMIT_NOFILE)\n" if $!{ETOOMANYREFS};
104 }) { # connected and request sent to lei-daemon, wait for responses or EOF
107 my (@fds) = $recv_cmd->($sock, my $buf, 4096 * 33);
108 if (scalar(@fds) == 1 && !defined($fds[0])) {
110 last if $!{ECONNRESET};
114 if ($buf =~ /\Aexec (.+)\z/) {
115 $exec_cmd->(\@fds, split(/\0/, $1));
116 } elsif ($buf eq '-WINCH') {
117 kill($buf, @parent); # for MUA
118 } elsif ($buf =~ /\Ax_it ([0-9]+)\z/) {
119 $x_it_code ||= $1 + 0;
121 } elsif ($buf =~ /\Achild_error ([0-9]+)\z/) {
122 $x_it_code ||= $1 + 0;
129 if (my $sig = ($x_it_code & 127)) {
133 exit($x_it_code >> 8);
134 } else { # for systems lacking Socket::MsgHdr or Inline::C
135 warn $@ if $@ && !ref($@);
136 require PublicInbox::LEI;
137 PublicInbox::LEI::oneshot(__PACKAGE__);