133 lines
3 KiB
Perl
133 lines
3 KiB
Perl
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#!/usr/bin/perl
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#
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# Example implementation for the Git filter protocol version 2
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# See Documentation/gitattributes.txt, section "Filter Protocol"
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#
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# Please note, this pass-thru filter is a minimal skeleton. No proper
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# error handling was implemented.
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#
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use strict;
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use warnings;
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my $MAX_PACKET_CONTENT_SIZE = 65516;
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sub packet_bin_read {
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my $buffer;
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my $bytes_read = read STDIN, $buffer, 4;
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if ( $bytes_read == 0 ) {
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# EOF - Git stopped talking to us!
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exit();
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}
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elsif ( $bytes_read != 4 ) {
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die "invalid packet: '$buffer'";
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}
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my $pkt_size = hex($buffer);
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if ( $pkt_size == 0 ) {
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return ( 1, "" );
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}
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elsif ( $pkt_size > 4 ) {
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my $content_size = $pkt_size - 4;
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$bytes_read = read STDIN, $buffer, $content_size;
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if ( $bytes_read != $content_size ) {
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die "invalid packet ($content_size bytes expected; $bytes_read bytes read)";
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}
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return ( 0, $buffer );
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}
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else {
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die "invalid packet size: $pkt_size";
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}
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}
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sub packet_txt_read {
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my ( $res, $buf ) = packet_bin_read();
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unless ( $buf =~ s/\n$// ) {
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die "A non-binary line MUST be terminated by an LF.";
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}
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return ( $res, $buf );
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}
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sub packet_bin_write {
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my $buf = shift;
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print STDOUT sprintf( "%04x", length($buf) + 4 );
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print STDOUT $buf;
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STDOUT->flush();
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}
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sub packet_txt_write {
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packet_bin_write( $_[0] . "\n" );
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}
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sub packet_flush {
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print STDOUT sprintf( "%04x", 0 );
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STDOUT->flush();
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}
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( packet_txt_read() eq ( 0, "git-filter-client" ) ) || die "bad initialize";
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( packet_txt_read() eq ( 0, "version=2" ) ) || die "bad version";
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( packet_bin_read() eq ( 1, "" ) ) || die "bad version end";
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packet_txt_write("git-filter-server");
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packet_txt_write("version=2");
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packet_flush();
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( packet_txt_read() eq ( 0, "capability=clean" ) ) || die "bad capability";
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( packet_txt_read() eq ( 0, "capability=smudge" ) ) || die "bad capability";
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( packet_bin_read() eq ( 1, "" ) ) || die "bad capability end";
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packet_txt_write("capability=clean");
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packet_txt_write("capability=smudge");
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packet_flush();
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while (1) {
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my ($command) = packet_txt_read() =~ /^command=(.+)$/;
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my ($pathname) = packet_txt_read() =~ /^pathname=(.+)$/;
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if ( $pathname eq "" ) {
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die "bad pathname '$pathname'";
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}
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packet_bin_read();
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my $input = "";
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{
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binmode(STDIN);
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my $buffer;
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my $done = 0;
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while ( !$done ) {
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( $done, $buffer ) = packet_bin_read();
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$input .= $buffer;
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}
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}
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my $output;
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if ( $command eq "clean" ) {
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### Perform clean here ###
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$output = $input;
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}
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elsif ( $command eq "smudge" ) {
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### Perform smudge here ###
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$output = $input;
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}
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else {
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die "bad command '$command'";
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}
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packet_txt_write("status=success");
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packet_flush();
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while ( length($output) > 0 ) {
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my $packet = substr( $output, 0, $MAX_PACKET_CONTENT_SIZE );
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packet_bin_write($packet);
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if ( length($output) > $MAX_PACKET_CONTENT_SIZE ) {
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$output = substr( $output, $MAX_PACKET_CONTENT_SIZE );
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}
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else {
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$output = "";
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}
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}
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packet_flush(); # flush content!
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packet_flush(); # empty list, keep "status=success" unchanged!
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}
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