t0021: make debug log file name configurable

The "rot13-filter.pl" helper wrote its debug logs always to "rot13-filter.log".
Make this configurable by defining the log file as first parameter of
"rot13-filter.pl".

This is useful if "rot13-filter.pl" is configured multiple times similar to the
subsequent patch 'convert: add "status=delayed" to filter process protocol'.

Signed-off-by: Lars Schneider <larsxschneider@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 5 insertions, 3 deletions

diff --git a/t/t0021/rot13-filter.pl b/t/t0021/rot13-filter.pl
index 617f581e56..0b943bb377 100644
--- a/t/t0021/rot13-filter.pl
+++ b/t/t0021/rot13-filter.pl
@@ -2,8 +2,9 @@
 # Example implementation for the Git filter protocol version 2
 # See Documentation/gitattributes.txt, section "Filter Protocol"
 #
-# The script takes the list of supported protocol capabilities as
-# arguments ("clean", "smudge", etc).
+# 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
@@ -24,9 +25,10 @@ use warnings;
 use IO::File;
 
 my $MAX_PACKET_CONTENT_SIZE = 65516;
+my $log_file                = shift @ARGV;
 my @capabilities            = @ARGV;
 
-open my $debug, ">>", "rot13-filter.log" or die "cannot open log file: $!";
+open my $debug, ">>", $log_file or die "cannot open log file: $!";
 
 sub rot13 {
 	my $str = shift;