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Packet.pm
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package Git::Packet; use 5.008001; use strict; use warnings $ENV{GIT_PERL_FATAL_WARNINGS} ? qw(FATAL all) : (); BEGIN { require Exporter; if ($] < 5.008003) { *import = \&Exporter::import; } else { # Exporter 5.57 which supports this invocation was # released with perl 5.8.3 Exporter->import('import'); } } our @EXPORT = qw( packet_compare_lists packet_bin_read packet_txt_read packet_key_val_read packet_bin_write packet_txt_write packet_flush packet_initialize packet_read_capabilities packet_read_and_check_capabilities packet_check_and_write_capabilities ); our @EXPORT_OK = @EXPORT; sub packet_compare_lists { my ($expect, @result) = @_; my $ix; if (scalar @$expect != scalar @result) { return undef; } for ($ix = 0; $ix < $#result; $ix++) { if ($expect->[$ix] ne $result[$ix]) { return undef; } } return 1; } sub packet_bin_read { my $buffer; my $bytes_read = read STDIN, $buffer, 4; if ( $bytes_read == 0 ) { # EOF - Git stopped talking to us! return ( -1, "" ); } elsif ( $bytes_read != 4 ) { die "invalid packet: '$buffer'"; } my $pkt_size = hex($buffer); if ( $pkt_size == 0 ) { return ( 1, "" ); } elsif ( $pkt_size > 4 ) { my $content_size = $pkt_size - 4; $bytes_read = read STDIN, $buffer, $content_size; if ( $bytes_read != $content_size ) { die "invalid packet ($content_size bytes expected; $bytes_read bytes read)"; } return ( 0, $buffer ); } else { die "invalid packet size: $pkt_size"; } } sub remove_final_lf_or_die { my $buf = shift; if ( $buf =~ s/\n$// ) { return $buf; } die "A non-binary line MUST be terminated by an LF.\n" . "Received: '$buf'"; } sub packet_txt_read { my ( $res, $buf ) = packet_bin_read(); if ( $res != -1 and $buf ne '' ) { $buf = remove_final_lf_or_die($buf); } return ( $res, $buf ); } # Read a text packet, expecting that it is in the form "key=value" for # the given $key. An EOF does not trigger any error and is reported # back to the caller (like packet_txt_read() does). Die if the "key" # part of "key=value" does not match the given $key, or the value part # is empty. sub packet_key_val_read { my ( $key ) = @_; my ( $res, $buf ) = packet_txt_read(); if ( $res == -1 or ( $buf =~ s/^$key=// and $buf ne '' ) ) { return ( $res, $buf ); } die "bad $key: '$buf'"; } sub packet_bin_write { my $buf = shift; print STDOUT sprintf( "%04x", length($buf) + 4 ); print STDOUT $buf; STDOUT->flush(); } sub packet_txt_write { packet_bin_write( $_[0] . "\n" ); } sub packet_flush { print STDOUT sprintf( "%04x", 0 ); STDOUT->flush(); } sub packet_initialize { my ($name, $version) = @_; packet_compare_lists([0, $name . "-client"], packet_txt_read()) || die "bad initialize"; packet_compare_lists([0, "version=" . $version], packet_txt_read()) || die "bad version"; packet_compare_lists([1, ""], packet_bin_read()) || die "bad version end"; packet_txt_write( $name . "-server" ); packet_txt_write( "version=" . $version ); packet_flush(); } sub packet_read_capabilities { my @cap; while (1) { my ( $res, $buf ) = packet_bin_read(); if ( $res == -1 ) { die "unexpected EOF when reading capabilities"; } return ( $res, @cap ) if ( $res != 0 ); $buf = remove_final_lf_or_die($buf); unless ( $buf =~ s/capability=// ) { die "bad capability buf: '$buf'"; } push @cap, $buf; } } # Read remote capabilities and check them against capabilities we require sub packet_read_and_check_capabilities { my @required_caps = @_; my ($res, @remote_caps) = packet_read_capabilities(); my %remote_caps = map { $_ => 1 } @remote_caps; foreach (@required_caps) { unless (exists($remote_caps{$_})) { die "required '$_' capability not available from remote" ; } } return %remote_caps; } # Check our capabilities we want to advertise against the remote ones # and then advertise our capabilities sub packet_check_and_write_capabilities { my ($remote_caps, @our_caps) = @_; foreach (@our_caps) { unless (exists($remote_caps->{$_})) { die "our capability '$_' is not available from remote" } packet_txt_write( "capability=" . $_ ); } packet_flush(); } 1;