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-rw-r--r--submodule.c3
-rwxr-xr-xt/t4060-diff-submodule-option-diff-format.sh41
2 files changed, 43 insertions, 1 deletions
diff --git a/submodule.c b/submodule.c
index 5a62aa2960..be29b3471a 100644
--- a/submodule.c
+++ b/submodule.c
@@ -475,7 +475,8 @@ void show_submodule_inline_diff(FILE *f, const char *path,
cp.no_stdin = 1;
/* TODO: other options may need to be passed here. */
- argv_array_push(&cp.args, "diff");
+ argv_array_pushl(&cp.args, "diff", "--submodule=diff", NULL);
+
argv_array_pushf(&cp.args, "--line-prefix=%s", line_prefix);
if (DIFF_OPT_TST(o, REVERSE_DIFF)) {
argv_array_pushf(&cp.args, "--src-prefix=%s%s/",
diff --git a/t/t4060-diff-submodule-option-diff-format.sh b/t/t4060-diff-submodule-option-diff-format.sh
index 7e23b55ea4..33b661140d 100755
--- a/t/t4060-diff-submodule-option-diff-format.sh
+++ b/t/t4060-diff-submodule-option-diff-format.sh
@@ -746,4 +746,45 @@ test_expect_success 'diff --submodule=diff with .git file' '
test_cmp expected actual
'
+test_expect_success 'diff --submodule=diff recurses into nested submodules' '
+ cat >expected <<-EOF &&
+ Submodule sm2 contains modified content
+ Submodule sm2 a5a65c9..280969a:
+ diff --git a/sm2/.gitmodules b/sm2/.gitmodules
+ new file mode 100644
+ index 0000000..3a816b8
+ --- /dev/null
+ +++ b/sm2/.gitmodules
+ @@ -0,0 +1,3 @@
+ +[submodule "nested"]
+ + path = nested
+ + url = ../sm2
+ Submodule nested 0000000...b55928c (new submodule)
+ diff --git a/sm2/nested/file b/sm2/nested/file
+ new file mode 100644
+ index 0000000..ca281f5
+ --- /dev/null
+ +++ b/sm2/nested/file
+ @@ -0,0 +1 @@
+ +nested content
+ diff --git a/sm2/nested/foo8 b/sm2/nested/foo8
+ new file mode 100644
+ index 0000000..db9916b
+ --- /dev/null
+ +++ b/sm2/nested/foo8
+ @@ -0,0 +1 @@
+ +foo8
+ diff --git a/sm2/nested/foo9 b/sm2/nested/foo9
+ new file mode 100644
+ index 0000000..9c3b4f6
+ --- /dev/null
+ +++ b/sm2/nested/foo9
+ @@ -0,0 +1 @@
+ +foo9
+ EOF
+ git diff --submodule=diff >actual 2>err &&
+ test_must_be_empty err &&
+ test_cmp expected actual
+'
+
test_done