t5512: stop losing return codes of git commands

In a pipe, only the return code of the last command is used. Thus, all
other commands will have their return codes masked. Rewrite pipes so
that there are no git commands upstream so that their failure is
reported.

Signed-off-by: Denton Liu <liu.denton@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t5512-ls-remote.sh

@@ -21,11 +21,11 @@ test_expect_success setup '
 	git tag mark1.1 &&
 	git tag mark1.2 &&
 	git tag mark1.10 &&
-	git show-ref --tags -d | sed -e "s/ /	/" >expected.tag &&
-	(
-		echo "$(git rev-parse HEAD)	HEAD" &&
-		git show-ref -d	| sed -e "s/ /	/"
-	) >expected.all &&
+	git show-ref --tags -d >expected.tag.raw &&
+	sed -e "s/ /	/" expected.tag.raw >expected.tag &&
+	generate_references HEAD >expected.all &&
+	git show-ref -d	>refs &&
+	sed -e "s/ /	/" refs >>expected.all &&
 
 	git remote add self "$(pwd)/.git"
 '
@@ -185,8 +185,8 @@ do
 		test_config $configsection.hiderefs refs/tags &&
 		git ls-remote . >actual &&
 		test_unconfig $configsection.hiderefs &&
-		git ls-remote . |
-		sed -e "/	refs\/tags\//d" >expect &&
+		git ls-remote . >expect.raw &&
+		sed -e "/	refs\/tags\//d" expect.raw >expect &&
 		test_cmp expect actual
 	'