made the pack completely portable and wrote relevent bat files to go with it

gitportable/mingw64/share/perl5/Git/IndexInfo.pm

@@ -0,0 +1,35 @@
+package Git::IndexInfo;
+use strict;
+use warnings $ENV{GIT_PERL_FATAL_WARNINGS} ? qw(FATAL all) : ();
+use Git qw/command_input_pipe command_close_pipe/;
+
+sub new {
+	my ($class) = @_;
+	my $hash_algo = Git::config('extensions.objectformat') || 'sha1';
+	my ($gui, $ctx) = command_input_pipe(qw/update-index -z --index-info/);
+	bless { gui => $gui, ctx => $ctx, nr => 0, hash_algo => $hash_algo}, $class;
+}
+
+sub remove {
+	my ($self, $path) = @_;
+	my $length = $self->{hash_algo} eq 'sha256' ? 64 : 40;
+	if (print { $self->{gui} } '0 ', 0 x $length, "\t", $path, "\0") {
+		return ++$self->{nr};
+	}
+	undef;
+}
+
+sub update {
+	my ($self, $mode, $hash, $path) = @_;
+	if (print { $self->{gui} } $mode, ' ', $hash, "\t", $path, "\0") {
+		return ++$self->{nr};
+	}
+	undef;
+}
+
+sub DESTROY {
+	my ($self) = @_;
+	command_close_pipe($self->{gui}, $self->{ctx});
+}
+
+1;