From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on dcvr.yhbt.net X-Spam-Level: X-Spam-Status: No, score=-4.0 required=3.0 tests=ALL_TRUSTED,BAYES_00 shortcircuit=no autolearn=ham autolearn_force=no version=3.4.2 Received: from localhost (dcvr.yhbt.net [127.0.0.1]) by dcvr.yhbt.net (Postfix) with ESMTP id 4A3491FA00 for ; Fri, 26 Mar 2021 09:51:27 +0000 (UTC) From: Eric Wong To: meta@public-inbox.org Subject: [PATCH 3/4] lei: support /dev/fd/[0-2] inputs and outputs in daemon Date: Fri, 26 Mar 2021 09:51:25 +0000 Message-Id: <20210326095126.8184-4-e@80x24.org> In-Reply-To: <20210326095126.8184-1-e@80x24.org> References: <20210326095126.8184-1-e@80x24.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit List-Id: Since lei-daemon won't have the same FDs as the client, we need to special-case thse mappings and won't be able to open arbitrary, non-standard FDs. We also won't attempt to support /proc/self/fd/[0-2] since that's a Linux-ism. /dev/fd/[0-2] and /dev/std{in,out,err} are portable to FreeBSD, at least. mawk(1) also supports /dev/std{out,err}, as does gawk(1) (which supports everything we can support, and arbitrary /dev/fd/$FD). --- lib/PublicInbox/LEI.pm | 23 ++++++++++------------- lib/PublicInbox/LeiConvert.pm | 3 ++- lib/PublicInbox/LeiInput.pm | 5 ++++- lib/PublicInbox/LeiOverview.pm | 13 +++++++------ lib/PublicInbox/LeiP2q.pm | 7 +++++-- lib/PublicInbox/LeiToMail.pm | 12 ++++++++---- t/lei-convert.t | 2 +- t/lei-import.t | 2 +- 8 files changed, 38 insertions(+), 29 deletions(-) diff --git a/lib/PublicInbox/LEI.pm b/lib/PublicInbox/LEI.pm index 59715633..eb3ad9e2 100644 --- a/lib/PublicInbox/LEI.pm +++ b/lib/PublicInbox/LEI.pm @@ -464,7 +464,6 @@ sub _lei_atfork_child { } } else { # worker, Net::NNTP (Net::Cmd) uses STDERR directly open STDERR, '+>&='.fileno($self->{2}) or warn "open $!"; - delete $self->{0}; } for (delete @$self{qw(3 old_1 au_done)}) { close($_) if defined($_); @@ -929,19 +928,17 @@ sub poke_mua { # forces terminal MUAs to wake up and hopefully notice new mail } my %path_to_fd = ('/dev/stdin' => 0, '/dev/stdout' => 1, '/dev/stderr' => 2); -$path_to_fd{"/dev/fd/$_"} = $path_to_fd{"/proc/self/fd/$_"} for (0..2); -sub fopen { - my ($self, $mode, $path) = @_; - rel2abs($self, $path); +$path_to_fd{"/dev/fd/$_"} = $_ for (0..2); + +# this also normalizes the path +sub path_to_fd { + my ($self, $path) = @_; + $path = rel2abs($self, $path); $path =~ tr!/!/!s; - if (defined(my $fd = $path_to_fd{$path})) { - return $self->{$fd}; - } - if ($path =~ m!\A/(?:dev|proc/self)/fd/[0-9]+\z!) { - return fail($self, "cannot open $path from daemon"); - } - open my $fh, $mode, $path or return; - $fh; + $path_to_fd{$path} // ( + ($path =~ m!\A/(?:dev|proc/self)/fd/[0-9]+\z!) ? + fail($self, "cannot open $path from daemon") : -1 + ); } # caller needs to "-t $self->{1}" to check if tty diff --git a/lib/PublicInbox/LeiConvert.pm b/lib/PublicInbox/LeiConvert.pm index 0cc65108..083ecc33 100644 --- a/lib/PublicInbox/LeiConvert.pm +++ b/lib/PublicInbox/LeiConvert.pm @@ -50,7 +50,8 @@ sub lei_convert { # the main "lei convert" method my $ovv = PublicInbox::LeiOverview->new($lei, 'out-format'); $lei->{l2m} or return $lei->fail("output not specified or is not a mail destination"); - $lei->{opt}->{augment} = 1 unless $ovv->{dst} eq '/dev/stdout'; + my $devfd = $lei->path_to_fd($ovv->{dst}) // return; + $lei->{opt}->{augment} = 1 if $devfd < 0; $self->prepare_inputs($lei, \@inputs) or return; my $op = $lei->workers_start($self, 'lei_convert', 1); $lei->{cnv} = $self; diff --git a/lib/PublicInbox/LeiInput.pm b/lib/PublicInbox/LeiInput.pm index b059ecda..eed0eed7 100644 --- a/lib/PublicInbox/LeiInput.pm +++ b/lib/PublicInbox/LeiInput.pm @@ -67,7 +67,10 @@ sub input_path_url { return; } $input =~ s!\A([a-z0-9]+):!!i and $ifmt = lc($1); - if (-f $input) { + my $devfd = $lei->path_to_fd($input) // return; + if ($devfd >= 0) { + $self->input_fh($ifmt, $lei->{$devfd}, $input, @args); + } elsif (-f $input) { my $m = $lei->{opt}->{'lock'} // ($ifmt eq 'eml' ? ['none'] : PublicInbox::MboxLock->defaults); my $mbl = PublicInbox::MboxLock->acq($input, 0, $m); diff --git a/lib/PublicInbox/LeiOverview.pm b/lib/PublicInbox/LeiOverview.pm index 96bfff24..8e26cba4 100644 --- a/lib/PublicInbox/LeiOverview.pm +++ b/lib/PublicInbox/LeiOverview.pm @@ -71,8 +71,9 @@ sub new { --$ofmt_key=$fmt and --output=$ofmt conflict } - $fmt //= 'json' if $dst eq '/dev/stdout'; - $fmt //= detect_fmt($lei, $dst) or return; + + my $devfd = $lei->path_to_fd($dst) // return; + $fmt //= $devfd >= 0 ? 'json' : (detect_fmt($lei, $dst) or return); if (index($dst, '://') < 0) { # not a URL, so assume path $dst = File::Spec->canonpath($dst); @@ -84,11 +85,11 @@ sub new { if ($fmt =~ /\A($JSONL|(?:concat)?json)\z/) { $json = $self->{json} = ref(PublicInbox::Config->json); } - if ($dst eq '/dev/stdout') { - my $isatty = $lei->{need_pager} = -t $lei->{1}; + if ($devfd >= 0) { + my $isatty = $lei->{need_pager} = -t $lei->{$devfd}; $opt->{pretty} //= $isatty; if (!$isatty && -f _) { - my $fl = fcntl($lei->{1}, F_GETFL, 0) // + my $fl = fcntl($lei->{$devfd}, F_GETFL, 0) // return $lei->fail("fcntl(stdout): $!"); ovv_out_lk_init($self) unless ($fl & O_APPEND); } else { @@ -101,7 +102,7 @@ sub new { $lei->{dedupe} //= PublicInbox::LeiDedupe->new($lei); } else { # default to the cheapest sort since MUA usually resorts - $opt->{'sort'} //= 'docid' if $dst ne '/dev/stdout'; + $opt->{'sort'} //= 'docid' if $devfd < 0; $lei->{l2m} = eval { PublicInbox::LeiToMail->new($lei) }; return $lei->fail($@) if $@; if ($opt->{mua} && $lei->{l2m}->lock_free) { diff --git a/lib/PublicInbox/LeiP2q.pm b/lib/PublicInbox/LeiP2q.pm index fda055fe..25f63a10 100644 --- a/lib/PublicInbox/LeiP2q.pm +++ b/lib/PublicInbox/LeiP2q.pm @@ -107,8 +107,11 @@ sub do_p2q { # via wq_do my $in = $self->{0}; unless ($in) { my $input = $self->{input}; - if (-e $input) { - $in = $lei->fopen('<', $input) or + my $devfd = $lei->path_to_fd($input) // return; + if ($devfd >= 0) { + $in = $lei->{$devfd}; + } elsif (-e $input) { + open($in, '<', $input) or return $lei->fail("open < $input: $!"); } else { my @cmd = (qw(git format-patch --stdout -1), $input); diff --git a/lib/PublicInbox/LeiToMail.pm b/lib/PublicInbox/LeiToMail.pm index f71f74cc..88468c34 100644 --- a/lib/PublicInbox/LeiToMail.pm +++ b/lib/PublicInbox/LeiToMail.pm @@ -503,10 +503,12 @@ sub _do_augment_imap { sub _pre_augment_mbox { my ($self, $lei) = @_; my $dst = $lei->{ovv}->{dst}; - my $out = $lei->{1}; - if ($dst ne '/dev/stdout') { + my $out; + my $devfd = $lei->path_to_fd($dst) // die "bad $dst"; + if ($devfd >= 0) { + $out = $lei->{$devfd}; + } else { # normal-looking path if (-p $dst) { - $out = undef; open $out, '>', $dst or die "open($dst): $!"; } elsif (-f _ || !-e _) { require PublicInbox::MboxLock; @@ -514,12 +516,14 @@ sub _pre_augment_mbox { PublicInbox::MboxLock->defaults; $self->{mbl} = PublicInbox::MboxLock->acq($dst, 1, $m); $out = $self->{mbl}->{fh}; + } else { + die "$dst is not a file or FIFO\n"; } $lei->{old_1} = $lei->{1}; # keep for spawning MUA } # Perl does SEEK_END even with O_APPEND :< $self->{seekable} = seek($out, 0, SEEK_SET); - if (!$self->{seekable} && $! != ESPIPE && $dst ne '/dev/stdout') { + if (!$self->{seekable} && $! != ESPIPE && !defined($devfd)) { die "seek($dst): $!\n"; } if (!$self->{seekable}) { diff --git a/t/lei-convert.t b/t/lei-convert.t index e147715d..9b430d8e 100644 --- a/t/lei-convert.t +++ b/t/lei-convert.t @@ -87,7 +87,7 @@ test_lei({ tmpdir => $tmpdir }, sub { my $exp = do { local $/; <$fh> }; is($out, $exp, 'stdin => stdout'); - lei_ok qw(convert -F eml -o mboxcl2:/dev/stdout t/plack-qp.eml); + lei_ok qw(convert -F eml -o mboxcl2:/dev/fd/1 t/plack-qp.eml); open $fh, '<', \$lei_out or BAIL_OUT; @bar = (); PublicInbox::MboxReader->mboxcl2($fh, sub { diff --git a/t/lei-import.t b/t/lei-import.t index a697d756..fa40ad01 100644 --- a/t/lei-import.t +++ b/t/lei-import.t @@ -69,7 +69,7 @@ is($res->[0]->{kw}, undef, 'no keywords set'); $eml->header_set('Message-ID', ''); $in = 'From k@y Fri Oct 2 00:00:00 1993'."\n".$eml->as_string; -lei_ok([qw(import -F mboxrd -)], undef, { %$lei_opt, 0 => \$in }, +lei_ok([qw(import -F mboxrd /dev/fd/0)], undef, { %$lei_opt, 0 => \$in }, \'import single file with --kw (default) from stdin'); lei(qw(q m:k@y)); $res = json_utf8->decode($lei_out);