fetch-pack: test support excluding large blobs

Created tests to verify fetch-pack and upload-pack support
for excluding large blobs using --filter=blobs:limit=<n>
parameter.

Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t5500-fetch-pack.sh

@@ -755,4 +755,31 @@ test_expect_success 'fetching deepen' '
 	)
 '
 
+test_expect_success 'filtering by size' '
+	rm -rf server client &&
+	test_create_repo server &&
+	test_commit -C server one &&
+	test_config -C server uploadpack.allowfilter 1 &&
+
+	test_create_repo client &&
+	git -C client fetch-pack --filter=blob:limit=0 ../server HEAD &&
+
+	# Ensure that object is not inadvertently fetched
+	test_must_fail git -C client cat-file -e $(git hash-object server/one.t)
+'
+
+test_expect_success 'filtering by size has no effect if support for it is not advertised' '
+	rm -rf server client &&
+	test_create_repo server &&
+	test_commit -C server one &&
+
+	test_create_repo client &&
+	git -C client fetch-pack --filter=blob:limit=0 ../server HEAD 2> err &&
+
+	# Ensure that object is fetched
+	git -C client cat-file -e $(git hash-object server/one.t) &&
+
+	test_i18ngrep "filtering not recognized by server" err
+'
+
 test_done

upload-pack.c

@@ -139,10 +139,15 @@ static void create_pack_file(void)
 	if (use_include_tag)
 		argv_array_push(&pack_objects.args, "--include-tag");
 	if (filter_options.filter_spec) {
-		struct strbuf buf = STRBUF_INIT;
-		sq_quote_buf(&buf, filter_options.filter_spec);
-		argv_array_pushf(&pack_objects.args, "--filter=%s", buf.buf);
-		strbuf_release(&buf);
+		if (pack_objects.use_shell) {
+			struct strbuf buf = STRBUF_INIT;
+			sq_quote_buf(&buf, filter_options.filter_spec);
+			argv_array_pushf(&pack_objects.args, "--filter=%s", buf.buf);
+			strbuf_release(&buf);
+		} else {
+			argv_array_pushf(&pack_objects.args, "--filter=%s",
+					 filter_options.filter_spec);
+		}
 	}
 
 	pack_objects.in = -1;