# Copyright (C) 2016 all contributors # License: AGPL-3.0+ # # git fast-import-based ssoma-mda MDA replacement # This is only ever run by public-inbox-mda and public-inbox-learn, # not the WWW or NNTP code which only requires read-only access. package PublicInbox::Import; use strict; use warnings; use Fcntl qw(:flock :DEFAULT); use Email::Address; use PublicInbox::Spawn qw(spawn); use PublicInbox::MID qw(mid_mime mid2path); sub new { my ($class, $git, $name, $email) = @_; bless { git => $git, ident => "$name <$email>", mark => 1, ref => 'refs/heads/master', }, $class } # idempotent start function sub gfi_start { my ($self) = @_; return ($self->{in}, $self->{out}) if $self->{pid}; my ($in_r, $in_w, $out_r, $out_w); pipe($in_r, $in_w) or die "pipe failed: $!"; pipe($out_r, $out_w) or die "pipe failed: $!"; my $git = $self->{git}; my $git_dir = $git->{git_dir}; my $lockpath = "$git_dir/ssoma.lock"; sysopen(my $lockfh, $lockpath, O_WRONLY|O_CREAT) or die "failed to open lock $lockpath: $!"; # wait for other processes to be done flock($lockfh, LOCK_EX) or die "lock failed: $!\n"; chomp($self->{tip} = $git->qx(qw(rev-parse --revs-only), $self->{ref})); my @cmd = ('git', "--git-dir=$git_dir", qw(fast-import --quiet --done --date-format=rfc2822)); my $rdr = { 0 => fileno($out_r), 1 => fileno($in_w) }; my $pid = spawn(\@cmd, undef, $rdr); die "spawn failed: $!" unless defined $pid; $out_w->autoflush(1); $self->{in} = $in_r; $self->{out} = $out_w; $self->{lockfh} = $lockfh; $self->{pid} = $pid; ($in_r, $out_w); } sub wfail () { die "write to fast-import failed: $!" } sub now2822 () { my @t = gmtime(time); my $day = qw(Sun Mon Tue Wed Thu Fri Sat)[$t[6]]; my $mon = qw(Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec)[$t[4]]; sprintf('%s, %2d %s %d %02d:%02d:%02d +0000', $day, $t[3], $mon, $t[5] + 1900, $t[2], $t[1], $t[0]); } # returns undef on non-existent # (-1, msg) on mismatch # (:MARK, msg) on success sub remove { my ($self, $mime) = @_; # mime = Email::MIME my $mid = mid_mime($mime); my $path = mid2path($mid); my ($r, $w) = $self->gfi_start; my $tip = $self->{tip}; return if $tip eq ''; print $w "ls $tip $path\n" or wfail; local $/ = "\n"; my $check = <$r>; defined $check or die "EOF from fast-import / ls: $!"; return if $check =~ /\Amissing /; $check =~ m!\A100644 blob ([a-f0-9]{40})\t!s or die "not blob: $check"; my $blob = $1; print $w "cat-blob $blob\n" or wfail; $check = <$r>; defined $check or die "EOF from fast-import / cat-blob: $!"; $check =~ /\A[a-f0-9]{40} blob (\d+)\n\z/ or die "unexpected cat-blob response: $check"; my $left = $1; my $offset = 0; my $buf = ''; my $n; while ($left > 0) { $n = read($r, $buf, $left, $offset); defined($n) or die "read cat-blob failed: $!"; $n == 0 and die 'fast-export (cat-blob) died'; $left -= $n; $offset += $n; } $n = read($r, my $lf, 1); defined($n) or die "read final byte of cat-blob failed: $!"; die "bad read on final byte: <$lf>" if $lf ne "\n"; my $cur = Email::MIME->new($buf); if ($cur->header('Subject') ne $mime->header('Subject') || $cur->body ne $mime->body) { return (-1, $cur); } my $ref = $self->{ref}; my $commit = $self->{mark}++; my $parent = $tip =~ /\A:/ ? $tip : undef; unless ($parent) { print $w "reset $ref\n" or wfail; } my $ident = $self->{ident}; my $now = now2822(); print $w "commit $ref\nmark :$commit\n", "author $ident $now\n", "committer $ident $now\n", "data 3\nrm\n\n", 'from ', ($parent ? $parent : $tip), "\n" or wfail; print $w "D $path\n\n" or wfail; (($self->{tip} = ":$commit"), $cur); } # returns undef on duplicate sub add { my ($self, $mime) = @_; # mime = Email::MIME my $from = $mime->header('From'); my @from = Email::Address->parse($from); my $name = $from[0]->name; my $email = $from[0]->address; my $date = $mime->header('Date'); my $subject = $mime->header('Subject'); $subject = '(no subject)' unless defined $subject; my $mid = mid_mime($mime); my $path = mid2path($mid); # git gets confused with: # "'A U Thor ' via foo" # ref: # $name =~ s/<([^>]+)>/($1)/g; my ($r, $w) = $self->gfi_start; my $tip = $self->{tip}; if ($tip ne '') { print $w "ls $tip $path\n" or wfail; local $/ = "\n"; my $check = <$r>; defined $check or die "EOF from fast-import: $!"; return unless $check =~ /\Amissing /; } # kill potentially confusing/misleading headers $mime->header_set($_) for qw(bytes lines content-length status); $mime = $mime->as_string; my $blob = $self->{mark}++; print $w "blob\nmark :$blob\ndata ", length($mime), "\n" or wfail; print $w $mime, "\n" or wfail; my $ref = $self->{ref}; my $commit = $self->{mark}++; my $parent = $tip =~ /\A:/ ? $tip : undef; unless ($parent) { print $w "reset $ref\n" or wfail; } # quiet down wide character warnings: binmode $w, ':utf8' or die "binmode :utf8 failed: $!"; print $w "commit $ref\nmark :$commit\n", "author $name <$email> $date\n", "committer $self->{ident} ", now2822(), "\n", "data ", (bytes::length($subject) + 1), "\n", $subject, "\n\n" or wfail; binmode $w, ':raw' or die "binmode :raw failed: $!"; if ($tip ne '') { print $w 'from ', ($parent ? $parent : $tip), "\n" or wfail; } print $w "M 100644 :$blob $path\n\n" or wfail; $self->{tip} = ":$commit"; } sub done { my ($self) = @_; my $w = delete $self->{out} or return; my $r = delete $self->{in} or die 'BUG: missing {in} when done'; print $w "done\n" or wfail; my $pid = delete $self->{pid} or die 'BUG: missing {pid} when done'; waitpid($pid, 0) == $pid or die 'fast-import did not finish'; $? == 0 or die "fast-import failed: $?"; my $lockfh = delete $self->{lockfh} or die "BUG: not locked: $!"; flock($lockfh, LOCK_UN) or die "unlock failed: $!"; close $lockfh or die "close lock failed: $!"; } 1;