- my ($cgi, $git, $path) = @_;
- my $env = $cgi->{env};
-
- my $input = $env->{'psgi.input'};
- my $buf;
- my $in;
- my $err = $env->{'psgi.errors'};
- if (fileno($input) >= 0) {
- $in = $input;
- } else { # FIXME untested
- $in = input_to_file($env) or return r(500);
- }
- my ($rpipe, $wpipe);
- unless (pipe($rpipe, $wpipe)) {
- $err->print("error creating pipe: $!\n");
- return r(500);
- }
- my $pid = fork; # TODO: vfork under Linux...
- unless (defined $pid) {
- $err->print("error forking: $!\n");
- return r(500);
- }
- my $git_dir = $git->{git_dir};
- if ($pid == 0) {
- # GIT_HTTP_EXPORT_ALL, GIT_COMMITTER_NAME, GIT_COMMITTER_EMAIL
- # may be set in the server-process and are passed as-is
- foreach my $name (qw(QUERY_STRING
- REMOTE_USER REMOTE_ADDR
- HTTP_CONTENT_ENCODING
- CONTENT_TYPE
- SERVER_PROTOCOL
- REQUEST_METHOD)) {
- my $val = $env->{$name};
- $ENV{$name} = $val if defined $val;
- }
- # $ENV{GIT_PROJECT_ROOT} = $git->{git_dir};
- $ENV{GIT_HTTP_EXPORT_ALL} = '1';
- $ENV{PATH_TRANSLATED} = "$git_dir/$path";
- dup2(fileno($in), 0) or die "redirect stdin failed: $!\n";
- dup2(fileno($wpipe), 1) or die "redirect stdout failed: $!\n";
- my @cmd = qw(git http-backend);
- exec(@cmd) or die 'exec `' . join(' ', @cmd). "' failed: $!\n";
- }
- $wpipe = $in = undef;
- $buf = '';
- my ($vin, $fh, $res);
- my $end = sub {
- if ($fh) {
- $fh->close;
- $fh = undef;
- } else {
- $res->(r(500)) if $res;
- }
- if ($rpipe) {
- $rpipe->close; # _may_ be Danga::Socket::close
- $rpipe = undef;
- }
- if (defined $pid) {
- my $wpid = $pid;
- $pid = undef;
- return if $wpid == waitpid($wpid, 0);
- $err->print("git http-backend ($git_dir): $?\n");
- }
- };
- my $fail = sub {
- my ($e) = @_;
- if ($e eq 'EAGAIN') {
- select($vin, undef, undef, undef) if defined $vin;
- # $vin is undef on async, so this is a noop on EAGAIN
- return;
- }
- $end->();
- $err->print("git http-backend ($git_dir): $e\n");
- };
- my $cb = sub { # read git-http-backend output and stream to client
- my $r = $rpipe ? $rpipe->sysread($buf, 8192, length($buf)) : 0;
- return $fail->($!{EAGAIN} ? 'EAGAIN' : $!) unless defined $r;
- return $end->() if $r == 0; # EOF
- if ($fh) { # stream body from git-http-backend to HTTP client
- $fh->write($buf);
- $buf = '';
- } elsif ($buf =~ s/\A(.*?)\r?\n\r?\n//s) { # parse headers
- my $h = $1;
- my $code = 200;
- my @h;
- foreach my $l (split(/\r?\n/, $h)) {
- my ($k, $v) = split(/:\s*/, $l, 2);
- if ($k =~ /\AStatus\z/i) {
- $code = int($v);
- } else {
- push @h, $k, $v;
- }
- }
- # write response header:
- $fh = $res->([ $code, \@h ]);
- $res = undef;
- $fh->write($buf);
- $buf = '';
- } # else { keep reading ... }
- };
- if (my $async = $env->{'pi-httpd.async'}) {
- $rpipe = $async->($rpipe, $cb);
- sub { ($res) = @_ } # let Danga::Socket handle the rest.
- } else { # synchronous loop
- $vin = '';
- vec($vin, fileno($rpipe), 1) = 1;
- sub {
- ($res) = @_;
- while ($rpipe) { $cb->() }
- }