# 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: $?";
# for compatibility with existing ssoma installations
# we can probably remove this entirely by 2020
my $git_dir = $self->{git}->{git_dir};
my $index = "$git_dir/ssoma.index";
# XXX: change the following scope to: if (-e $index) # in 2018 or so..
unless ($ENV{FAST}) {
local $ENV{GIT_INDEX_FILE} = $index;
system('git', "--git-dir=$git_dir", qw(read-tree -m -v -i),
$self->{ref}) == 0 or
die "failed to update $git_dir/ssoma.index: $?\n";
}
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;