diff mbox series

[v3,2/5] diff: mode-only change should be noticed by "--patch -w --exit-code"

Message ID 20230818235932.3253552-3-gitster@pobox.com (mailing list archive)
State Accepted
Commit c9a3e724cf75b44e47cfca5ae37cd0d7864c2220
Headers show
Series fix interactions with "-w" and "--exit-code" | expand

Commit Message

Junio C Hamano Aug. 18, 2023, 11:59 p.m. UTC
The codepath to notice the content-level changes, taking certain
no-op changes like "ignore whitespace" into account, forgot that
a mode-only change is still a change.  This resulted in

    $ git diff --patch --exit-code -w

to exit with status 0 even when there is such a mode-only change,
breaking both "--patch" and "--quiet" output formats.

Teach the builtin_diff() codepath that creation and deletion as well
as mode changes are all interesting changes.

Note that the test specifically checks removal of an empty file,
because if there is anything in the preimage (i.e. the removed file
is not empty), the removal would still trigger textual patch output
and the codepath for that does update .found_changes bit to report
that it found an interesting change.  We need to make sure that the
.found_changes bit is set even without triggering textual patch
output.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 diff.c                     |  3 +++
 t/t4015-diff-whitespace.sh | 35 ++++++++++++++++++++++++++++++++++-
 2 files changed, 37 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/diff.c b/diff.c
index 0ce678fc06..998d7ae20c 100644
--- a/diff.c
+++ b/diff.c
@@ -3497,18 +3497,21 @@  static void builtin_diff(const char *name_a,
 		strbuf_addf(&header, "%s%snew file mode %06o%s\n", line_prefix, meta, two->mode, reset);
 		if (xfrm_msg)
 			strbuf_addstr(&header, xfrm_msg);
+		o->found_changes = 1;
 		must_show_header = 1;
 	}
 	else if (lbl[1][0] == '/') {
 		strbuf_addf(&header, "%s%sdeleted file mode %06o%s\n", line_prefix, meta, one->mode, reset);
 		if (xfrm_msg)
 			strbuf_addstr(&header, xfrm_msg);
+		o->found_changes = 1;
 		must_show_header = 1;
 	}
 	else {
 		if (one->mode != two->mode) {
 			strbuf_addf(&header, "%s%sold mode %06o%s\n", line_prefix, meta, one->mode, reset);
 			strbuf_addf(&header, "%s%snew mode %06o%s\n", line_prefix, meta, two->mode, reset);
+			o->found_changes = 1;
 			must_show_header = 1;
 		}
 		if (xfrm_msg)
diff --git a/t/t4015-diff-whitespace.sh b/t/t4015-diff-whitespace.sh
index f3e20dd5bb..02731dccb9 100755
--- a/t/t4015-diff-whitespace.sh
+++ b/t/t4015-diff-whitespace.sh
@@ -1,7 +1,7 @@ 
 #!/bin/sh
 #
 # Copyright (c) 2006 Johannes E. Schindelin
-#
+# Copyright (c) 2023 Google LLC
 
 test_description='Test special whitespace in diff engine.
 
@@ -11,6 +11,39 @@  TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-diff.sh
 
+for opts in --patch --quiet -s
+do
+
+	test_expect_success "status with $opts (different)" '
+		echo foo >x &&
+		git add x &&
+		echo bar >x &&
+		test_expect_code 1 git diff -w $opts --exit-code x
+	'
+
+	test_expect_success POSIXPERM "status with $opts (mode differs)" '
+		test_when_finished "git update-index --chmod=-x x" &&
+		echo foo >x &&
+		git add x &&
+		git update-index --chmod=+x x &&
+		test_expect_code 1 git diff -w $opts --exit-code x
+	'
+
+	test_expect_success "status with $opts (removing an empty file)" '
+		: >x &&
+		git add x &&
+		rm x &&
+		test_expect_code 1 git diff -w $opts --exit-code -- x
+	'
+
+	test_expect_success "status with $opts (different but equivalent)" '
+		echo foo >x &&
+		git add x &&
+		echo " foo" >x &&
+		git diff -w $opts --exit-code x
+	'
+done
+
 test_expect_success "Ray Lehtiniemi's example" '
 	cat <<-\EOF >x &&
 	do {