1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
| | #!perl -w
# 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 PublicInbox::CmdIPC4;
my $narg = 4;
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*
$narg = 4;
$recv_cmd = PublicInbox::Spawn->can('recv_cmd4');
PublicInbox::Spawn->can('send_cmd4');
};
sub exec_cmd {
my ($fds, $argc, @argv) = @_;
my %env = map { split(/=/, $_, 2) } splice(@argv, $argc);
my @m = (*STDIN{IO}, '<&=', *STDOUT{IO}, '>&=',
*STDERR{IO}, '>&=');
for my $fd (@$fds) {
my ($old_io, $mode) = splice(@m, 0, 2);
open($old_io, $mode, $fd) or die "open $mode$fd: $!";
}
%ENV = (%ENV, %env);
exec(@argv);
die "exec: @argv: $!";
}
my ($sock, $pwd);
if ($send_cmd && eval {
my $path = do {
my $runtime_dir = ($ENV{XDG_RUNTIME_DIR} // '') . '/lei';
if ($runtime_dir eq '/lei') {
require File::Spec;
$runtime_dir = File::Spec->tmpdir."/lei-$<";
}
unless (-d $runtime_dir) {
require File::Path;
File::Path::mkpath($runtime_dir, 0, 0700);
}
"$runtime_dir/$narg.sock";
};
my $addr = pack_sockaddr_un($path);
socket($sock, AF_UNIX, SOCK_STREAM, 0) or die "socket: $!";
unless (connect($sock, $addr)) { # start the daemon if not started
local $ENV{PERL5LIB} = join(':', @INC);
open(my $daemon, '-|', $^X, qw[-MPublicInbox::LEI
-E PublicInbox::LEI::lazy_start(@ARGV)],
$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)
Falling back to (slow) one-shot mode
}
require Cwd;
$pwd = $ENV{PWD} // '';
my $cwd = Cwd::fastcwd() // die "fastcwd(PWD=$pwd): $!";
if ($pwd ne $cwd) { # prefer ENV{PWD} if it's a symlink to real cwd
my @st_cwd = stat($cwd) or die "stat(cwd=$cwd): $!";
my @st_pwd = stat($pwd); # PWD invalid, use cwd
# 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;
}
1;
}) { # (Socket::MsgHdr|Inline::C), $sock, $pwd are all available:
local $ENV{PWD} = $pwd;
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
$send_cmd->($sock, [ 0, 1, 2 ], $buf, 0);
while (my (@fds) = $recv_cmd->($sock, $buf, 4096 * 33)) {
if ($buf =~ /\Aexit=([0-9]+)\n\z/) {
exit($1);
} elsif ($buf =~ /\Aexec (.+)\n\z/) {
exec_cmd(\@fds, split(/\0/, $1));
} else {
die $buf;
}
}
} else { # for systems lacking Socket::MsgHdr or Inline::C
warn $@ if $@;
require PublicInbox::LEI;
PublicInbox::LEI::oneshot(__PACKAGE__);
}
|