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#
# Example implementation for the Git filter protocol version 2
# See Documentation/gitattributes.txt, section "Filter Protocol"
#
# The first argument defines a debug log file that the script write to.
# All remaining arguments define a list of supported protocol
# capabilities ("clean", "smudge", etc).
#
# This implementation supports special test cases:
# (1) If data with the pathname "clean-write-fail.r" is processed with
# a "clean" operation then the write operation will die.
# (2) If data with the pathname "smudge-write-fail.r" is processed with
# a "smudge" operation then the write operation will die.
# (3) If data with the pathname "error.r" is processed with any
# operation then the filter signals that it cannot or does not want
# to process the file.
# (4) If data with the pathname "abort.r" is processed with any
# operation then the filter signals that it cannot or does not want
# to process the file and any file after that is processed with the
# same command.
# (5) If data with a pathname that is a key in the DELAY hash is
# requested (e.g. "test-delay10.a") then the filter responds with
# a "delay" status and sets the "requested" field in the DELAY hash.
# The filter will signal the availability of this object after
# "count" (field in DELAY hash) "list_available_blobs" commands.
# (6) If data with the pathname "missing-delay.a" is processed that the
# filter will drop the path from the "list_available_blobs" response.
# (7) If data with the pathname "invalid-delay.a" is processed that the
# filter will add the path "unfiltered" which was not delayed before
# to the "list_available_blobs" response.
#
use 5.008;
sub gitperllib {
# Git assumes that all path lists are Unix-y colon-separated ones. But
# when the Git for Windows executes the test suite, its MSYS2 Bash
# calls git.exe, and colon-separated path lists are converted into
# Windows-y semicolon-separated lists of *Windows* paths (which
# naturally contain a colon after the drive letter, so splitting by
# colons simply does not cut it).
#
# Detect semicolon-separated path list and handle them appropriately.
if ($ENV{GITPERLLIB} =~ /;/) {
return split(/;/, $ENV{GITPERLLIB});
}
return split(/:/, $ENV{GITPERLLIB});
}
use lib (gitperllib());
use strict;
use warnings;
use IO::File;
use Git::Packet;
my $MAX_PACKET_CONTENT_SIZE = 65516;
my $log_file = shift @ARGV;
my @capabilities = @ARGV;
open my $debug, ">>", $log_file or die "cannot open log file: $!";
my %DELAY = (
'test-delay10.a' => { "requested" => 0, "count" => 1 },
'test-delay11.a' => { "requested" => 0, "count" => 1 },
'test-delay20.a' => { "requested" => 0, "count" => 2 },
'test-delay10.b' => { "requested" => 0, "count" => 1 },
'missing-delay.a' => { "requested" => 0, "count" => 1 },
'invalid-delay.a' => { "requested" => 0, "count" => 1 },
);
sub rot13 {
my $str = shift;
$str =~ y/A-Za-z/N-ZA-Mn-za-m/;
return $str;
}
print $debug "START\n";
$debug->flush();
packet_initialize("git-filter", 2);
my %remote_caps = packet_read_and_check_capabilities("clean", "smudge", "delay");
packet_check_and_write_capabilities(\%remote_caps, @capabilities);
print $debug "init handshake complete\n";
$debug->flush();
while (1) {
my ( $res, $command ) = packet_key_val_read("command");
if ( $res == -1 ) {
print $debug "STOP\n";
exit();
}
print $debug "IN: $command";
$debug->flush();
if ( $command eq "list_available_blobs" ) {
# Flush
packet_compare_lists([1, ""], packet_bin_read()) ||
die "bad list_available_blobs end";
foreach my $pathname ( sort keys %DELAY ) {
if ( $DELAY{$pathname}{"requested"} >= 1 ) {
$DELAY{$pathname}{"count"} = $DELAY{$pathname}{"count"} - 1;
if ( $pathname eq "invalid-delay.a" ) {
# Send Git a pathname that was not delayed earlier
packet_txt_write("pathname=unfiltered");
}
if ( $pathname eq "missing-delay.a" ) {
# Do not signal Git that this file is available
} elsif ( $DELAY{$pathname}{"count"} == 0 ) {
print $debug " $pathname";
packet_txt_write("pathname=$pathname");
}
}
}
packet_flush();
print $debug " [OK]\n";
$debug->flush();
packet_txt_write("status=success");
packet_flush();
} else {
my ( $res, $pathname ) = packet_key_val_read("pathname");
if ( $res == -1 ) {
die "unexpected EOF while expecting pathname";
}
print $debug " $pathname";
$debug->flush();
# Read until flush
my ( $done, $buffer ) = packet_txt_read();
while ( $buffer ne '' ) {
if ( $buffer eq "can-delay=1" ) {
if ( exists $DELAY{$pathname} and $DELAY{$pathname}{"requested"} == 0 ) {
$DELAY{$pathname}{"requested"} = 1;
}
} else {
die "Unknown message '$buffer'";
}
( $done, $buffer ) = packet_txt_read();
}
if ( $done == -1 ) {
die "unexpected EOF after pathname '$pathname'";
}
my $input = "";
{
binmode(STDIN);
my $buffer;
my $done = 0;
while ( !$done ) {
( $done, $buffer ) = packet_bin_read();
$input .= $buffer;
}
if ( $done == -1 ) {
die "unexpected EOF while reading input for '$pathname'";
}
print $debug " " . length($input) . " [OK] -- ";
$debug->flush();
}
my $output;
if ( exists $DELAY{$pathname} and exists $DELAY{$pathname}{"output"} ) {
$output = $DELAY{$pathname}{"output"}
} elsif ( $pathname eq "error.r" or $pathname eq "abort.r" ) {
$output = "";
} elsif ( $command eq "clean" and grep( /^clean$/, @capabilities ) ) {
$output = rot13($input);
} elsif ( $command eq "smudge" and grep( /^smudge$/, @capabilities ) ) {
$output = rot13($input);
} else {
die "bad command '$command'";
}
if ( $pathname eq "error.r" ) {
print $debug "[ERROR]\n";
$debug->flush();
packet_txt_write("status=error");
packet_flush();
} elsif ( $pathname eq "abort.r" ) {
print $debug "[ABORT]\n";
$debug->flush();
packet_txt_write("status=abort");
packet_flush();
} elsif ( $command eq "smudge" and
exists $DELAY{$pathname} and
$DELAY{$pathname}{"requested"} == 1 ) {
print $debug "[DELAYED]\n";
$debug->flush();
packet_txt_write("status=delayed");
packet_flush();
$DELAY{$pathname}{"requested"} = 2;
$DELAY{$pathname}{"output"} = $output;
} else {
packet_txt_write("status=success");
packet_flush();
if ( $pathname eq "${command}-write-fail.r" ) {
print $debug "[WRITE FAIL]\n";
$debug->flush();
die "${command} write error";
}
print $debug "OUT: " . length($output) . " ";
$debug->flush();
while ( length($output) > 0 ) {
my $packet = substr( $output, 0, $MAX_PACKET_CONTENT_SIZE );
packet_bin_write($packet);
# dots represent the number of packets
print $debug ".";
if ( length($output) > $MAX_PACKET_CONTENT_SIZE ) {
$output = substr( $output, $MAX_PACKET_CONTENT_SIZE );
} else {
$output = "";
}
}
packet_flush();
print $debug " [OK]\n";
$debug->flush();
packet_flush();
}
}
}
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