1 # Copyright (C) 2020-2021 all contributors <meta@public-inbox.org>
2 # License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
4 # Backend for `lei' (local email interface). Unlike the C10K-oriented
5 # PublicInbox::Daemon, this is designed exclusively to handle trusted
6 # local clients with read/write access to the FS and use as many
7 # system resources as the local user has access to.
8 package PublicInbox::LEI;
11 use parent qw(PublicInbox::DS PublicInbox::LeiExternal
12 PublicInbox::LeiQuery);
14 use Socket qw(AF_UNIX SOCK_STREAM pack_sockaddr_un);
15 use Errno qw(EAGAIN ECONNREFUSED ENOENT);
18 use Sys::Syslog qw(syslog openlog);
19 use PublicInbox::Config;
20 use PublicInbox::Syscall qw(SFD_NONBLOCK EPOLLIN EPOLLONESHOT);
21 use PublicInbox::Sigfd;
22 use PublicInbox::DS qw(now dwaitpid);
23 use PublicInbox::Spawn qw(spawn run_die popen_rd);
24 use PublicInbox::OnDestroy;
25 use Text::Wrap qw(wrap);
26 use File::Path qw(mkpath);
28 our $quit = \&CORE::exit;
29 my ($recv_cmd, $send_cmd);
30 my $GLP = Getopt::Long::Parser->new;
31 $GLP->configure(qw(gnu_getopt no_ignore_case auto_abbrev));
32 my $GLP_PASS = Getopt::Long::Parser->new;
33 $GLP_PASS->configure(qw(gnu_getopt no_ignore_case auto_abbrev pass_through));
35 our %PATH2CFG; # persistent for socket daemon
36 our @TO_CLOSE_ATFORK_CHILD;
38 # TBD: this is a documentation mechanism to show a subcommand
39 # (may) pass options through to another command:
40 sub pass_through { $GLP_PASS }
44 my ($spec, $re_str) = @_; # 'limit|n=i', '([0-9]+)'
45 my ($key) = ($spec =~ m/\A([a-z]+)/g);
46 my $cb = sub { # Getopt::Long "<>" catch-all handler
48 if ($arg =~ /\A-($re_str)\z/) {
50 } elsif ($arg eq '--') { # "--" arg separator, ignore first
51 push @{$OPT->{-argv}}, $arg if $OPT->{'--'}++;
52 # lone (single) dash is handled elsewhere
53 } elsif (substr($arg, 0, 1) eq '-') {
55 push @{$OPT->{-argv}}, $arg;
57 die "bad argument: $arg\n";
60 push @{$OPT->{-argv}}, $arg;
63 ($spec, '<>' => $cb, $GLP_PASS) # for Getopt::Long
68 File::Spec->rel2abs(($env->{XDG_DATA_HOME} //
69 ($env->{HOME} // '/nonexistent').'/.local/share')
70 .'/lei/store', $env->{PWD});
73 sub _config_path ($) {
75 File::Spec->rel2abs(($env->{XDG_CONFIG_HOME} //
76 ($env->{HOME} // '/nonexistent').'/.config')
77 .'/lei/config', $env->{PWD});
80 # TODO: generate shell completion + help using %CMD and %OPTDESC
81 # command => [ positional_args, 1-line description, Getopt::Long option spec ]
82 our %CMD = ( # sorted in order of importance/use:
83 'q' => [ 'SEARCH_TERMS...', 'search for messages matching terms', qw(
84 save-as=s output|mfolder|o=s format|f=s dedupe|d=s thread|t augment|a
85 sort|s=s reverse|r offset=i remote local! external! pretty
86 since|after=s until|before=s), opt_dash('limit|n=i', '[0-9]+') ],
88 'show' => [ 'MID|OID', 'show a given object (Message-ID or object ID)',
89 qw(type=s solve! format|f=s dedupe|d=s thread|t remote local!),
90 pass_through('git show') ],
92 'add-external' => [ 'URL_OR_PATHNAME',
93 'add/set priority of a publicinbox|extindex for extra matches',
94 qw(boost=i quiet|q) ],
95 'ls-external' => [ '[FILTER...]', 'list publicinbox|extindex locations',
96 qw(format|f=s z|0 local remote quiet|q) ],
97 'forget-external' => [ '{URL_OR_PATHNAME|--prune}',
98 'exclude further results from a publicinbox|extindex',
101 'ls-query' => [ '[FILTER...]', 'list saved search queries',
102 qw(name-only format|f=s z) ],
103 'rm-query' => [ 'QUERY_NAME', 'remove a saved search' ],
104 'mv-query' => [ qw(OLD_NAME NEW_NAME), 'rename a saved search' ],
106 'plonk' => [ '--thread|--from=IDENT',
107 'exclude mail matching From: or thread from non-Message-ID searches',
108 qw(stdin| thread|t from|f=s mid=s oid=s) ],
109 'mark' => [ 'MESSAGE_FLAGS...',
110 'set/unset flags on message(s) from stdin',
111 qw(stdin| oid=s exact by-mid|mid:s) ],
112 'forget' => [ '[--stdin|--oid=OID|--by-mid=MID]',
113 "exclude message(s) on stdin from `q' search results",
114 qw(stdin| oid=s exact by-mid|mid:s quiet|q) ],
116 'purge-mailsource' => [ '{URL_OR_PATHNAME|--all}',
117 'remove imported messages from IMAP, Maildirs, and MH',
118 qw(exact! all jobs:i indexed) ],
120 # code repos are used for `show' to solve blobs from patch mails
121 'add-coderepo' => [ 'PATHNAME', 'add or set priority of a git code repo',
123 'ls-coderepo' => [ '[FILTER_TERMS...]',
124 'list known code repos', qw(format|f=s z) ],
125 'forget-coderepo' => [ 'PATHNAME',
126 'stop using repo to solve blobs from patches',
129 'add-watch' => [ '[URL_OR_PATHNAME]',
130 'watch for new messages and flag changes',
131 qw(import! flags! interval=s recursive|r exclude=s include=s) ],
132 'ls-watch' => [ '[FILTER...]', 'list active watches with numbers and status',
134 'pause-watch' => [ '[WATCH_NUMBER_OR_FILTER]', qw(all local remote) ],
135 'resume-watch' => [ '[WATCH_NUMBER_OR_FILTER]', qw(all local remote) ],
136 'forget-watch' => [ '{WATCH_NUMBER|--prune}', 'stop and forget a watch',
139 'import' => [ '{URL_OR_PATHNAME|--stdin}',
140 'one-shot import/update from URL or filesystem',
141 qw(stdin| offset=i recursive|r exclude=s include=s !flags),
144 'config' => [ '[...]', sub {
145 'git-config(1) wrapper for '._config_path($_[0]);
146 }, qw(config-file|system|global|file|f=s), # for conflict detection
147 pass_through('git config') ],
148 'init' => [ '[PATHNAME]', sub {
149 'initialize storage, default: '._store_path($_[0]);
151 'daemon-kill' => [ '[-SIGNAL]', 'signal the lei-daemon',
152 opt_dash('signal|s=s', '[0-9]+|(?:[A-Z][A-Z0-9]+)') ],
153 'daemon-pid' => [ '', 'show the PID of the lei-daemon' ],
154 'help' => [ '[SUBCOMMAND]', 'show help' ],
156 # XXX do we need this?
157 # 'git' => [ '[ANYTHING...]', 'git(1) wrapper', pass_through('git') ],
159 'reorder-local-store-and-break-history' => [ '[REFNAME]',
160 'rewrite git history in an attempt to improve compression',
163 # internal commands are prefixed with '_'
164 '_complete' => [ '[...]', 'internal shell completion helper',
165 pass_through('everything') ],
168 # switch descriptions, try to keep consistent across commands
169 # $spec: Getopt::Long option specification
170 # $spec => [@ALLOWED_VALUES (default is first), $description],
171 # $spec => $description
172 # "$SUB_COMMAND TAB $spec" => as above
173 my $stdin_formats = [ 'IN|auto|raw|mboxrd|mboxcl2|mboxcl|mboxo',
174 'specify message input format' ];
175 my $ls_format = [ 'OUT|plain|json|null', 'listing output format' ];
178 'help|h' => 'show this built-in help',
179 'quiet|q' => 'be quiet',
180 'solve!' => 'do not attempt to reconstruct blobs from emails',
181 'save-as=s' => ['NAME', 'save a search terms by given name'],
183 'type=s' => [ 'any|mid|git', 'disambiguate type' ],
185 'dedupe|d=s' => ['STRAT|content|oid|mid|none',
186 'deduplication strategy'],
187 'show thread|t' => 'display entire thread a message belongs to',
189 'return all messages in the same thread as the actual match(es)',
190 'augment|a' => 'augment --output destination instead of clobbering',
192 'output|o=s' => [ 'DEST',
193 "destination (e.g. `/path/to/Maildir', or `-' for stdout)" ],
195 'show format|f=s' => [ 'OUT|plain|raw|html|mboxrd|mboxcl2|mboxcl',
196 'message/object output format' ],
197 'mark format|f=s' => $stdin_formats,
198 'forget format|f=s' => $stdin_formats,
199 'q format|f=s' => [ 'OUT|maildir|mboxrd|mboxcl2|mboxcl|html|oid|json',
200 'specify output format, default depends on --output'],
201 'ls-query format|f=s' => $ls_format,
202 'ls-external format|f=s' => $ls_format,
204 'limit|n=i@' => ['NUM', 'limit on number of matches (default: 10000)' ],
205 'offset=i' => ['OFF', 'search result offset (default: 0)'],
207 'sort|s=s' => [ 'VAL|received,relevance,docid',
208 "order of results `--output'-dependent"],
209 'reverse|r' => [ 'reverse search results' ], # like sort(1)
211 'boost=i' => 'increase/decrease priority of results (default: 0)',
213 'local' => 'limit operations to the local filesystem',
214 'local!' => 'exclude results from the local filesystem',
215 'remote' => 'limit operations to those requiring network access',
216 'remote!' => 'prevent operations requiring network access',
218 'mid=s' => 'specify the Message-ID of a message',
219 'oid=s' => 'specify the git object ID of a message',
221 'recursive|r' => 'scan directories/mailboxes/newsgroups recursively',
222 'exclude=s' => 'exclude mailboxes/newsgroups based on pattern',
223 'include=s' => 'include mailboxes/newsgroups based on pattern',
225 'exact' => 'operate on exact header matches only',
226 'exact!' => 'rely on content match instead of exact header matches',
228 'by-mid|mid:s' => [ 'MID', 'match only by Message-ID, ignoring contents' ],
229 'jobs:i' => 'set parallelism level',
231 # xargs, env, use "-0", git(1) uses "-z". We support z|0 everywhere
232 'z|0' => 'use NUL \\0 instead of newline (CR) to delimit lines',
234 'signal|s=s' => [ 'SIG', 'signal to send lei-daemon (default: TERM)' ],
238 'leistore.dir' => 'top-level storage location',
241 sub x_it ($$) { # pronounced "exit"
242 my ($self, $code) = @_;
243 $self->{1}->autoflush(1); # make sure client sees stdout before exit
244 my $sig = ($code & 127);
245 $code >>= 8 unless $sig;
246 if (my $sock = $self->{sock}) {
247 my $fds = [ map { fileno($_) } @$self{0..2} ];
248 $send_cmd->($sock, $fds, "exit=$code\n", 0);
249 } else { # for oneshot
254 sub puts ($;@) { print { shift->{1} } map { "$_\n" } @_ }
256 sub out ($;@) { print { shift->{1} } @_ }
259 print { shift->{2} } @_, (substr($_[-1], -1, 1) eq "\n" ? () : "\n");
262 sub qerr ($;@) { $_[0]->{opt}->{quiet} or err(shift, @_) }
265 my ($self, $buf, $exit_code) = @_;
267 x_it($self, ($exit_code // 1) << 8);
271 sub atfork_prepare_wq {
272 my ($self, $wq) = @_;
273 push @{$wq->{-ipc_atfork_child_close}}, @TO_CLOSE_ATFORK_CHILD,
274 grep { defined } @$self{qw(0 1 2 sock)}
277 # usage: local %SIG = (%SIG, $lei->atfork_child_wq($wq));
278 sub atfork_child_wq {
279 my ($self, $wq) = @_;
280 $self->{sock} //= $wq->{0};
281 $self->{$_} //= $wq->{$_} for (0..2);
282 my $oldpipe = $SIG{PIPE};
284 @TO_CLOSE_ATFORK_CHILD = ();
286 __WARN__ => sub { err($self, @_) },
289 $oldpipe->() if ref($oldpipe) eq 'CODE';
294 # usage: ($lei, @io) = $lei->atfork_parent_wq($wq);
295 sub atfork_parent_wq {
296 my ($self, $wq) = @_;
297 if ($wq->wq_workers) {
298 my $env = delete $self->{env}; # env is inherited at fork
299 my $ret = bless { %$self }, ref($self);
301 delete @$ret{qw(-lei_store cfg)};
302 my $in = delete $ret->{0};
303 ($ret, delete($ret->{sock}) // $in, delete @$ret{1, 2});
305 ($self, ($self->{sock} // $self->{0}), @$self{1, 2});
310 my ($self, $errmsg) = @_;
311 my $cmd = $self->{cmd} // 'COMMAND';
312 my @info = @{$CMD{$cmd} // [ '...', '...' ]};
313 my @top = ($cmd, shift(@info) // ());
314 my $cmd_desc = shift(@info);
315 $cmd_desc = $cmd_desc->($self->{env}) if ref($cmd_desc) eq 'CODE';
318 for my $sw (grep { !ref } @info) { # ("prio=s", "z", $GLP_PASS)
319 my $desc = $OPTDESC{"$cmd\t$sw"} // $OPTDESC{$sw} // next;
321 ($arg_vals, $desc) = @$desc if ref($desc) eq 'ARRAY';
323 # lower-case is a keyword (e.g. `content', `oid'),
324 # ALL_CAPS is a string description (e.g. `PATH')
325 if ($desc !~ /default/ && $arg_vals =~ /\b([a-z]+)[,\|]/) {
326 $desc .= "\ndefault: `$1'";
330 if ($x =~ s/!\z//) { # solve! => --no-solve
332 } elsif ($x =~ s/:.+//) { # optional args: $x = "mid:s"
333 @vals = (' [', undef, ']');
334 } elsif ($x =~ s/=.+//) { # required arg: $x = "type=s"
335 @vals = (' ', undef);
336 } # else: no args $x = 'thread|t'
337 for (split(/\|/, $x)) { # help|h
338 length($_) > 1 ? push(@l, "--$_") : push(@s, "-$_");
340 if (!scalar(@vals)) { # no args 'thread|t'
341 } elsif ($arg_vals =~ s/\A([A-Z_]+)\b//) { # "NAME"
344 $vals[1] = uc(substr($l[0], 2)); # "--type" => "TYPE"
346 if ($arg_vals =~ /([,\|])/) {
348 my @allow = split(/\Q$sep\E/, $arg_vals);
349 my $must = $sep eq '|' ? 'Must' : 'Can';
350 @allow = map { "`$_'" } @allow;
351 my $last = pop @allow;
352 $desc .= "\n$must be one of: " .
353 join(', ', @allow) . " or $last";
355 my $lhs = join(', ', @s, @l) . join('', @vals);
356 if ($x =~ /\|\z/) { # "stdin|" or "clear|"
357 $lhs =~ s/\A--/- , --/;
359 $lhs =~ s/\A--/ --/; # pad if no short options
361 $lpad = length($lhs) if length($lhs) > $lpad;
362 push @opt_desc, $lhs, $desc;
364 my $msg = $errmsg ? "E: $errmsg\n" : '';
371 local $Text::Wrap::columns = 78 - $lpad;
372 my $padding = ' ' x ($lpad + 2);
373 while (my ($lhs, $rhs) = splice(@opt_desc, 0, 2)) {
374 $msg .= ' '.pack("A$lpad", $lhs);
375 $rhs = wrap('', '', $rhs);
376 $rhs =~ s/\n/\n$padding/sg; # LHS pad continuation lines
380 print { $self->{$errmsg ? 2 : 1} } $msg;
381 x_it($self, $errmsg ? 1 << 8 : 0); # stderr => failure
386 my ($self, $cmd, $argv) = @_;
388 $OPT = $self->{opt} = {};
389 my $info = $CMD{$cmd} // [ '[...]' ];
390 my ($proto, undef, @spec) = @$info;
391 my $glp = ref($spec[-1]) eq ref($GLP) ? pop(@spec) : $GLP;
392 push @spec, qw(help|h);
394 if ($spec[0] =~ s/\|\z//s) { # "stdin|" or "clear|" allows "-" alias
395 $lone_dash = $spec[0];
396 $OPT->{$spec[0]} = \(my $var);
397 push @spec, '' => \$var;
399 $glp->getoptionsfromarray($argv, $OPT, @spec) or
400 return _help($self, "bad arguments or options for $cmd");
401 return _help($self) if $OPT->{help};
403 push @$argv, @{$OPT->{-argv}} if defined($OPT->{-argv});
405 # "-" aliases "stdin" or "clear"
406 $OPT->{$lone_dash} = ${$OPT->{$lone_dash}} if defined $lone_dash;
409 my $POS_ARG = '[A-Z][A-Z0-9_]+';
411 my @args = split(/ /, $proto);
412 for my $var (@args) {
413 if ($var =~ /\A$POS_ARG\.\.\.\z/o) { # >= 1 args;
414 $inf = defined($argv->[$i]) and last;
415 $var =~ s/\.\.\.\z//;
416 $err = "$var not supplied";
417 } elsif ($var =~ /\A$POS_ARG\z/o) { # required arg at $i
418 $argv->[$i++] // ($err = "$var not supplied");
419 } elsif ($var =~ /\.\.\.\]\z/) { # optional args start
422 } elsif ($var =~ /\A\[-?$POS_ARG\]\z/) { # one optional arg
424 } elsif ($var =~ /\A.+?\|/) { # required FOO|--stdin
425 my @or = split(/\|/, $var);
428 if ($o =~ /\A--([a-z0-9\-]+)/) {
429 $ok = defined($OPT->{$1});
431 } elsif (defined($argv->[$i])) {
435 } # else continue looping
438 $err = join(', ', @or) . " or $last must be set";
440 warn "BUG: can't parse `$var' in $proto";
444 if (!$inf && scalar(@$argv) > scalar(@args)) {
445 $err //= 'too many arguments';
447 $err ? fail($self, "usage: lei $cmd $proto\nE: $err") : 1;
451 my ($self, $cmd, @argv) = @_;
452 local $SIG{__WARN__} = sub { err($self, @_) };
453 return _help($self, 'no command given') unless defined($cmd);
454 my $func = "lei_$cmd";
456 if (my $cb = __PACKAGE__->can($func)) {
457 optparse($self, $cmd, \@argv) or return;
459 } elsif (grep(/\A-/, $cmd, @argv)) { # --help or -h only
461 $GLP->getoptionsfromarray([$cmd, @argv], $opt, qw(help|h)) or
462 return _help($self, 'bad arguments or options');
465 fail($self, "`$cmd' is not an lei command");
470 my ($self, $creat) = @_;
471 my $f = _config_path($self->{env});
473 my $cur_st = @st ? pack('dd', $st[10], $st[7]) : ''; # 10:ctime, 7:size
474 if (my $cfg = $PATH2CFG{$f}) { # reuse existing object in common case
475 return ($self->{cfg} = $cfg) if $cur_st eq $cfg->{-st};
482 my (undef, $cfg_dir, undef) = File::Spec->splitpath($f);
483 -d $cfg_dir or mkpath($cfg_dir) or die "mkpath($cfg_dir): $!\n";
484 open my $fh, '>>', $f or die "open($f): $!\n";
485 @st = stat($fh) or die "fstat($f): $!\n";
486 $cur_st = pack('dd', $st[10], $st[7]);
487 qerr($self, "I: $f created") if $self->{cmd} ne 'config';
489 my $cfg = PublicInbox::Config::git_config_dump($f);
490 $cfg->{-st} = $cur_st;
492 $self->{cfg} = $PATH2CFG{$f} = $cfg;
495 sub _lei_store ($;$) {
496 my ($self, $creat) = @_;
497 my $cfg = _lei_cfg($self, $creat);
498 $cfg->{-lei_store} //= do {
499 require PublicInbox::LeiStore;
500 my $dir = $cfg->{'leistore.dir'};
501 $dir //= _store_path($self->{env}) if $creat;
503 PublicInbox::LeiStore->new($dir, { creat => $creat });
508 my ($self, @argv) = @_;
512 my ($self, @argv) = @_;
516 my ($self, @argv) = @_;
517 $self->{opt}->{'config-file'} and return fail $self,
518 "config file switches not supported by `lei config'";
519 my $env = $self->{env};
520 delete local $env->{GIT_CONFIG};
521 my $cfg = _lei_cfg($self, 1);
522 my $cmd = [ qw(git config -f), $cfg->{'-f'}, @argv ];
523 my %rdr = map { $_ => $self->{$_} } (0..2);
524 run_die($cmd, $env, \%rdr);
528 my ($self, $dir) = @_;
529 my $cfg = _lei_cfg($self, 1);
530 my $cur = $cfg->{'leistore.dir'};
531 my $env = $self->{env};
532 $dir //= _store_path($env);
533 $dir = File::Spec->rel2abs($dir, $env->{PWD}); # PWD is symlink-aware
534 my @cur = stat($cur) if defined($cur);
535 $cur = File::Spec->canonpath($cur // $dir);
536 my @dir = stat($dir);
537 my $exists = "I: leistore.dir=$cur already initialized" if @dir;
540 _lei_store($self, 1)->done;
541 return qerr($self, $exists);
544 # some folks like symlinks and bind mounts :P
545 if (@dir && "$cur[0] $cur[1]" eq "$dir[0] $dir[1]") {
546 lei_config($self, 'leistore.dir', $dir);
547 _lei_store($self, 1)->done;
548 return qerr($self, "$exists (as $cur)");
550 return fail($self, <<"");
551 E: leistore.dir=$cur already initialized and it is not $dir
554 lei_config($self, 'leistore.dir', $dir);
555 _lei_store($self, 1)->done;
556 $exists //= "I: leistore.dir=$dir newly initialized";
557 return qerr($self, $exists);
560 sub lei_daemon_pid { puts shift, $$ }
562 sub lei_daemon_kill {
564 my $sig = $self->{opt}->{signal} // 'TERM';
565 kill($sig, $$) or fail($self, "kill($sig, $$): $!");
568 sub lei_help { _help($_[0]) }
570 # Shell completion helper. Used by lei-completion.bash and hopefully
571 # other shells. Try to do as much here as possible to avoid redundancy
572 # and improve maintainability.
574 my ($self, @argv) = @_; # argv = qw(lei and any other args...)
575 shift @argv; # ignore "lei", the entire command is sent
576 @argv or return puts $self, grep(!/^_/, keys %CMD), qw(--help -h);
577 my $cmd = shift @argv;
578 my $info = $CMD{$cmd} // do { # filter matching commands
579 @argv or puts $self, grep(/\A\Q$cmd\E/, keys %CMD);
582 my ($proto, undef, @spec) = @$info;
584 my $re = defined($cur) ? qr/\A\Q$cur\E/ : qr/./;
585 if (substr($cur // '-', 0, 1) eq '-') { # --switches
586 # gross special case since the only git-config options
587 # Consider moving to a table if we need more special cases
588 # we use Getopt::Long for are the ones we reject, so these
589 # are the ones we don't reject:
590 if ($cmd eq 'config') {
591 puts $self, grep(/$re/, keys %CONFIG_KEYS);
592 @spec = qw(add z|null get get-all unset unset-all
593 replace-all get-urlmatch
594 remove-section rename-section
595 name-only list|l edit|e
596 get-color-name get-colorbool);
600 puts $self, grep(/$re/, map { # generate short/long names
602 if (s/=.+\z//) { # required arg, e.g. output|o=i
604 } elsif (s/:.+\z//) { # optional arg, e.g. mid:s
605 } else { # negation: solve! => no-solve|solve
606 s/\A(.+)!\z/no-$1|$1/;
609 length > 1 ? "--$_$eq" : "-$_"
610 } split(/\|/, $_, -1) # help|h
611 } grep { $OPTDESC{"$cmd\t$_"} || $OPTDESC{$_} } @spec);
612 } elsif ($cmd eq 'config' && !@argv && !$CONFIG_KEYS{$cur}) {
613 puts $self, grep(/$re/, keys %CONFIG_KEYS);
615 # TODO: URLs, pathnames, OIDs, MIDs, etc... See optparse() for
619 sub reap_exec { # dwaitpid callback
620 my ($self, $pid) = @_;
624 sub lei_git { # support passing through random git commands
625 my ($self, @argv) = @_;
626 my %rdr = map { $_ => $self->{$_} } (0..2);
627 my $pid = spawn(['git', @argv], $self->{env}, \%rdr);
628 dwaitpid($pid, \&reap_exec, $self);
631 # caller needs to "-t $self->{1}" to check if tty
634 my $env = $self->{env};
635 my $fh = popen_rd([qw(git var GIT_PAGER)], $env);
636 chomp(my $pager = <$fh> // '');
637 close($fh) or warn "`git var PAGER' error: \$?=$?";
638 return if $pager eq 'cat' || $pager eq '';
640 my %new_env = (LESS => 'FRX', LV => '-c', COLUMNS => 80);
641 $new_env{MORE} = 'FRX' if $^O eq 'freebsd';
642 pipe(my ($r, $wpager)) or return warn "pipe: $!";
643 my $rdr = { 0 => $r, 1 => $self->{1}, 2 => $self->{2} };
645 if (my $sock = $self->{sock}) { # lei(1) process runs it
646 delete @new_env{keys %$env}; # only set iff unset
647 my $buf = "exec 1\0".$pager;
648 while (my ($k, $v) = each %new_env) { $buf .= "\0$k=$v" };
649 my $fds = [ map { fileno($_) } @$rdr{0..2} ];
650 $send_cmd->($sock, $fds, $buf .= "\n", 0);
652 $pid = spawn([$pager], $env, $rdr);
654 $self->{1} = $wpager;
655 $self->{2} = $wpager if -t $self->{2};
656 $env->{GIT_PAGER_IN_USE} = 'true'; # we may spawn git
657 [ $pid, @$rdr{1, 2} ];
660 sub accept_dispatch { # Listener {post_accept} callback
661 my ($sock) = @_; # ignore other
664 my $self = bless { sock => $sock }, __PACKAGE__;
665 vec(my $rin = '', fileno($sock), 1) = 1;
666 # `say $sock' triggers "die" in lei(1)
668 if (select(my $rout = $rin, undef, undef, 1)) {
669 my @fds = $recv_cmd->($sock, $buf, 4096 * 33); # >MAX_ARG_STRLEN
670 if (scalar(@fds) == 3) {
672 for my $rdr (qw(<&= >&= >&=)) {
673 my $fd = shift(@fds);
674 if (open(my $fh, $rdr, $fd)) {
677 say $sock "open($rdr$fd) (FD=$i): $!";
682 say $sock "recv_cmd failed: $!";
686 say $sock "timed out waiting to recv FDs";
689 $self->{2}->autoflush(1); # keep stdout buffered until x_it|DESTROY
690 # $ENV_STR = join('', map { "\0$_=$ENV{$_}" } keys %ENV);
691 # $buf = "$$\0$argc\0".join("\0", @ARGV).$ENV_STR."\0\0";
692 if (substr($buf, -2, 2, '') ne "\0\0") { # s/\0\0\z//
693 say $sock "request command truncated";
696 my ($argc, @argv) = split(/\0/, $buf, -1);
698 my %env = map { split(/=/, $_, 2) } splice(@argv, $argc);
699 if (chdir($env{PWD})) {
701 $self->{env} = \%env;
702 eval { dispatch($self, @argv) };
705 say $sock "chdir($env{PWD}): $!"; # implicit close
709 # for long-running results
712 local %ENV = %{$self->{env}};
715 say { $self->{sock} } $@;
716 $self->close; # PublicInbox::DS::close
722 our $oldset; sub oldset { $oldset }
724 # lei(1) calls this when it can't connect
726 my ($path, $errno, $nfd) = @_;
727 if ($errno == ECONNREFUSED) {
728 unlink($path) or die "unlink($path): $!";
729 } elsif ($errno != ENOENT) {
730 $! = $errno; # allow interpolation to stringify in die
731 die "connect($path): $!";
733 umask(077) // die("umask(077): $!");
734 socket(my $l, AF_UNIX, SOCK_STREAM, 0) or die "socket: $!";
735 bind($l, pack_sockaddr_un($path)) or die "bind($path): $!";
736 listen($l, 1024) or die "listen: $!";
737 my @st = stat($path) or die "stat($path): $!";
738 my $dev_ino_expect = pack('dd', $st[0], $st[1]); # dev+ino
739 pipe(my ($eof_r, $eof_w)) or die "pipe: $!";
740 local $oldset = PublicInbox::DS::block_signals();
742 require PublicInbox::CmdIPC1;
743 $send_cmd = PublicInbox::CmdIPC1->can('send_cmd1');
744 $recv_cmd = PublicInbox::CmdIPC1->can('recv_cmd1');
745 } elsif ($nfd == 4) {
746 $send_cmd = PublicInbox::Spawn->can('send_cmd4');
747 $recv_cmd = PublicInbox::Spawn->can('recv_cmd4') // do {
748 require PublicInbox::CmdIPC4;
749 $send_cmd = PublicInbox::CmdIPC4->can('send_cmd4');
750 PublicInbox::CmdIPC4->can('recv_cmd4');
753 $recv_cmd or die <<"";
754 (Socket::MsgHdr || IO::FDPass || Inline::C) missing/unconfigured (nfd=$nfd);
756 require PublicInbox::Listener;
757 require PublicInbox::EOFpipe;
758 (-p STDOUT) or die "E: stdout must be a pipe\n";
759 open(STDIN, '+<', '/dev/null') or die "redirect stdin failed: $!";
760 POSIX::setsid() > 0 or die "setsid: $!";
761 my $pid = fork // die "fork: $!";
763 $0 = "lei-daemon $path";
765 local @TO_CLOSE_ATFORK_CHILD = ($l, $eof_r, $eof_w);
766 $_->blocking(0) for ($l, $eof_r, $eof_w);
767 $l = PublicInbox::Listener->new($l, \&accept_dispatch, $l);
770 $exit_code //= shift;
771 my $listener = $l or exit($exit_code);
772 unlink($path) if defined($path);
773 # closing eof_w triggers \&noop wakeup
774 $eof_w = $l = $path = undef;
775 $listener->close; # DS::close
776 PublicInbox::DS->SetLoopTimeout(1000);
778 PublicInbox::EOFpipe->new($eof_r, \&noop, undef);
780 CHLD => \&PublicInbox::DS::enqueue_reap,
788 my $sigfd = PublicInbox::Sigfd->new($sig, SFD_NONBLOCK);
789 local %SIG = (%SIG, %$sig) if !$sigfd;
790 local $SIG{PIPE} = 'IGNORE';
791 if ($sigfd) { # TODO: use inotify/kqueue to detect unlinked sockets
792 push @TO_CLOSE_ATFORK_CHILD, $sigfd->{sock};
793 PublicInbox::DS->SetLoopTimeout(5000);
795 # wake up every second to accept signals if we don't
796 # have signalfd or IO::KQueue:
797 PublicInbox::DS::sig_setmask($oldset);
798 PublicInbox::DS->SetLoopTimeout(1000);
800 PublicInbox::DS->SetPostLoopCallback(sub {
801 my ($dmap, undef) = @_;
802 if (@st = defined($path) ? stat($path) : ()) {
803 if ($dev_ino_expect ne pack('dd', $st[0], $st[1])) {
804 warn "$path dev/ino changed, quitting\n";
807 } elsif (defined($path)) {
808 warn "stat($path): $!, quitting ...\n";
809 undef $path; # don't unlink
812 return 1 if defined($path);
815 for my $s (values %$dmap) {
816 $s->can('busy') or next;
817 if ($s->busy($now)) {
823 $n; # true: continue, false: stop
826 # STDIN was redirected to /dev/null above, closing STDERR and
827 # STDOUT will cause the calling `lei' client process to finish
828 # reading the <$daemon> pipe.
829 openlog($path, 'pid', 'user');
830 local $SIG{__WARN__} = sub { syslog('warning', "@_") };
831 my $on_destroy = PublicInbox::OnDestroy->new($$, sub {
832 syslog('crit', "$@") if $@;
834 open STDERR, '>&STDIN' or die "redirect stderr failed: $!";
835 open STDOUT, '>&STDIN' or die "redirect stdout failed: $!";
836 # $daemon pipe to `lei' closed, main loop begins:
837 PublicInbox::DS->EventLoop;
838 @$on_destroy = (); # cancel on_destroy if we get here
839 exit($exit_code // 0);
842 # for users w/o IO::FDPass
845 my $exit = $main_pkg->can('exit'); # caller may override exit()
846 local $quit = $exit if $exit;
848 umask(077) // die("umask(077): $!");
854 }, __PACKAGE__), @ARGV);
857 # ensures stdout hits the FS before sock disconnects so a client
858 # can immediately reread it
861 $self->{1}->autoflush(1);