Re: t7800-difftool.sh failure on pu

Hi Tim,

With the current pu branch, I have t7800.3 (difftool ignores bad --tool values)
failing on Linux (I haven't tried cygwin or mingw yet). The failure is caused
by the test for the value of the exit code; for me the exit code is 9 not 1.

I have investigated, briefly, and found *two* alternatives for a fix. ;-)

The first option is to (effectively) revert commit 0440ed72 ("difftool: replace
system call with Git::command_noisy", 22-03-2012), like so:

-- >8 --

diff --git a/git-difftool.perl b/git-difftool.perl
index e1754ff..49613b1 100755
--- a/git-difftool.perl
+++ b/git-difftool.perl

@@ -237,5 +237,7 @@ if (defined($dirdiff)) {
 
 	$ENV{GIT_PAGER} = '';
 	$ENV{GIT_EXTERNAL_DIFF} = 'git-difftool--helper';
-	git_cmd_try { Git::command_noisy(('diff', @ARGV)) } 'exit code %d';
+	my @command = ('git', 'diff', @ARGV);
+	my $rc = system(@command);
+	exit($rc | ($rc >> 8));
 }
-- 8< --