The codepath to notice the content-level changes, taking certaion
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@xxxxxxxxx>
---
diff.c | 3 +++
t/t4015-diff-whitespace.sh | 35 ++++++++++++++++++++++++++++++++++-
2 files changed, 37 insertions(+), 1 deletion(-)
diff --git a/diff.c b/diff.c
index ce9c8272c7..de18364902 100644
--- a/diff.c
+++ b/diff.c
@@ -3501,18 +3501,21 @@ 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..943ad252d4 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 "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 {
--
2.42.0-rc2
