git-diff: don't squelch the new SHA1 in submodule diffs
The code to squelch empty diffs introduced by commit
fb13227e089f22dc31a3b1624559153821056848 would inadvertently
populate filespec "two" of a submodule change using the uninitialized
(null) SHA1, thereby replacing the submodule SHA1 by 0{40} in the output.
This change teaches diffcore_skip_stat_unmatch to handle
submodule changes correctly.
Signed-off-by: Sven Verdoolaege <skimo@kotnet.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/diff.c b/diff.c
index 0d30d05..1aca5df 100644
--- a/diff.c
+++ b/diff.c
@@ -3144,6 +3144,22 @@
*q = outq;
}
+/* Check whether two filespecs with the same mode and size are identical */
+static int diff_filespec_is_identical(struct diff_filespec *one,
+ struct diff_filespec *two)
+{
+ if (S_ISGITLINK(one->mode)) {
+ diff_fill_sha1_info(one);
+ diff_fill_sha1_info(two);
+ return !hashcmp(one->sha1, two->sha1);
+ }
+ if (diff_populate_filespec(one, 0))
+ return 0;
+ if (diff_populate_filespec(two, 0))
+ return 0;
+ return !memcmp(one->data, two->data, one->size);
+}
+
static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
{
int i;
@@ -3175,10 +3191,7 @@
diff_populate_filespec(p->one, 1) ||
diff_populate_filespec(p->two, 1) ||
(p->one->size != p->two->size) ||
-
- diff_populate_filespec(p->one, 0) || /* (2) */
- diff_populate_filespec(p->two, 0) ||
- memcmp(p->one->data, p->two->data, p->one->size))
+ !diff_filespec_is_identical(p->one, p->two)) /* (2) */
diff_q(&outq, p);
else {
/*
