add--interactive: ignore mode change in 'p'atch command

When a path is examined in the patch subcommand, any mode changes in
the file are given to use in the diff header by git-diff. If no hunks
are staged, then we throw out that header and do not touch the
path.  But if _any_ hunks are staged, we use the header, and the mode
is changed together with the contents.

Since the 'p'atch command should just be dealing with hunks that are
shown to the user, it makes sense to just ignore mode changes
entirely. We do squirrel away the mode, though, since the next patch
will allow users to select the mode update separately.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

2 files changed, 25 insertions, 0 deletions

diff --git a/git-add--interactive.perl b/git-add--interactive.perl
index a0a81f134a..5cdda29c54 100755
--- a/git-add--interactive.perl
+++ b/git-add--interactive.perl
@@ -550,6 +550,21 @@ sub parse_diff {
 	return @hunk;
 }
 
+sub parse_diff_header {
+	my $src = shift;
+
+	my $head = { TEXT => [], DISPLAY => [] };
+	my $mode = { TEXT => [], DISPLAY => [] };
+
+	for (my $i = 0; $i < @{$src->{TEXT}}; $i++) {
+		my $dest = $src->{TEXT}->[$i] =~ /^(old|new) mode (\d+)$/ ?
+			$mode : $head;
+		push @{$dest->{TEXT}}, $src->{TEXT}->[$i];
+		push @{$dest->{DISPLAY}}, $src->{DISPLAY}->[$i];
+	}
+	return ($head, $mode);
+}
+
 sub hunk_splittable {
 	my ($text) = @_;
 
@@ -795,6 +810,7 @@ sub patch_update_file {
 	my ($ix, $num);
 	my $path = shift;
 	my ($head, @hunk) = parse_diff($path);
+	($head, my $mode) = parse_diff_header($head);
 	for (@{$head->{DISPLAY}}) {
 		print;
 	}
diff --git a/t/t3701-add-interactive.sh b/t/t3701-add-interactive.sh
index 77c90f6fa0..d920d06d5a 100755
--- a/t/t3701-add-interactive.sh
+++ b/t/t3701-add-interactive.sh
@@ -66,4 +66,13 @@ test_expect_success 'revert works (commit)' '
 	grep "unchanged *+3/-0 file" output
 '
 
+test_expect_success 'patch does not affect mode' '
+	git reset --hard &&
+	echo content >>file &&
+	chmod +x file &&
+	printf "y\\n" | git add -p &&
+	git show :file | grep content &&
+	git diff file | grep "new mode"
+'
+
 test_done