1 # Copyright (C) 2014-2015 all contributors <meta@public-inbox.org>
2 # License: GPLv2 or later (https://www.gnu.org/licenses/gpl-2.0.txt)
4 # Used to read files from a git repository without excessive forking.
5 # Used in our web interfaces as well as our -nntpd server.
6 # This is based on code in Git.pm which is GPLv2, but modified to avoid
7 # dependence on environment variables for compatibility with mod_perl.
8 # There are also API changes to simplify our usage and data set.
9 package PublicInbox::Git;
14 use PublicInbox::Spawn qw(spawn popen_rd);
17 my ($class, $git_dir) = @_;
18 bless { git_dir => $git_dir }, $class
22 my ($self, $batch, $in, $out, $pid) = @_;
23 return if $self->{$pid};
24 my ($in_r, $in_w, $out_r, $out_w);
26 pipe($in_r, $in_w) or fail($self, "pipe failed: $!");
27 pipe($out_r, $out_w) or fail($self, "pipe failed: $!");
29 my @cmd = ('git', "--git-dir=$self->{git_dir}", qw(cat-file), $batch);
30 my $redir = { 0 => fileno($out_r), 1 => fileno($in_w) };
31 $self->{$pid} = spawn(\@cmd, undef, $redir);
33 $self->{$out} = $out_w;
38 my ($self, $obj, $ref) = @_;
40 $self->_bidi_pipe(qw(--batch in out pid));
41 $self->{out}->print($obj, "\n") or fail($self, "write error: $!");
44 my $head = $in->getline;
45 $head =~ / missing$/ and return undef;
46 $head =~ /^[0-9a-f]{40} \S+ (\d+)$/ or
47 fail($self, "Unexpected result from git cat-file: $head");
50 my $ref_type = $ref ? ref($ref) : '';
54 $$ref = $size if ($ref_type eq 'SCALAR');
57 if ($ref_type eq 'CODE') {
58 $rv = eval { $ref->($in, \$left) };
63 my $r = read($in, my $x, $left > $max ? $max : $left);
64 defined($r) or fail($self, "read failed: $!");
65 $r == 0 and fail($self, 'exited unexpectedly');
72 my $r = read($in, $buf, $left, $offset);
73 defined($r) or fail($self, "read failed: $!");
74 $r == 0 and fail($self, 'exited unexpectedly');
81 my $r = read($in, my $buf, 1);
82 defined($r) or fail($self, "read failed: $!");
83 fail($self, 'newline missing after blob') if ($r != 1 || $buf ne "\n");
84 die $cb_err if $cb_err;
90 my ($self, $obj) = @_;
91 $self->_bidi_pipe(qw(--batch-check in_c out_c pid_c));
92 $self->{out_c}->print($obj, "\n") or fail($self, "write error: $!");
93 chomp(my $line = $self->{in_c}->getline);
94 my ($hex, $type, $size) = split(' ', $line);
95 return if $type eq 'missing';
100 my ($self, $in, $out, $pid) = @_;
101 my $p = delete $self->{$pid} or return;
102 foreach my $f ($in, $out) {
109 my ($self, $msg) = @_;
115 my ($self, @cmd) = @_;
116 @cmd = ('git', "--git-dir=$self->{git_dir}", @cmd);
121 my ($self, @cmd) = @_;
122 my $fh = $self->popen(@cmd);
123 return <$fh> if wantarray;
130 _destroy($self, qw(in out pid));
131 _destroy($self, qw(in_c out_c pid_c));
134 sub DESTROY { cleanup(@_) }