t9109: don't swallow Git errors upstream of pipes

'git ... | foo' will mask any errors or crashes in git, so split up such
pipes in this file.

One testcase uses several separate pipe sequences in a row which are
awkward to split up. Wrap the split-up pipe in a function so the
awkwardness is not repeated. Also change that testcase's surrounding
quotes from double to single to avoid premature string interpolation.

Signed-off-by: Matthew DeVore <matvore@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t9101-git-svn-props.sh

@@ -174,7 +174,8 @@ test_expect_success 'test create-ignore' "
 	cmp ./deeply/.gitignore create-ignore.expect &&
 	cmp ./deeply/nested/.gitignore create-ignore.expect &&
 	cmp ./deeply/nested/directory/.gitignore create-ignore.expect &&
-	git ls-files -s | grep gitignore | cmp - create-ignore-index.expect
+	git ls-files -s >ls_files_result &&
+	grep gitignore ls_files_result | cmp - create-ignore-index.expect
 	"
 
 cat >prop.expect <<\EOF
@@ -189,17 +190,21 @@ EOF
 # This test can be improved: since all the svn:ignore contain the same
 # pattern, it can pass even though the propget did not execute on the
 # right directory.
-test_expect_success 'test propget' "
-	git svn propget svn:ignore . | cmp - prop.expect &&
+test_expect_success 'test propget' '
+	test_propget () {
+		git svn propget $1 $2 >actual &&
+		cmp $3 actual
+	} &&
+	test_propget svn:ignore . prop.expect &&
 	cd deeply &&
-	git svn propget svn:ignore . | cmp - ../prop.expect &&
-	git svn propget svn:entry:committed-rev nested/directory/.keep \
-	  | cmp - ../prop2.expect &&
-	git svn propget svn:ignore .. | cmp - ../prop.expect &&
-	git svn propget svn:ignore nested/ | cmp - ../prop.expect &&
-	git svn propget svn:ignore ./nested | cmp - ../prop.expect &&
-	git svn propget svn:ignore .././deeply/nested | cmp - ../prop.expect
-	"
+	test_propget svn:ignore . ../prop.expect &&
+	test_propget svn:entry:committed-rev nested/directory/.keep \
+		../prop2.expect &&
+	test_propget svn:ignore .. ../prop.expect &&
+	test_propget svn:ignore nested/ ../prop.expect &&
+	test_propget svn:ignore ./nested ../prop.expect &&
+	test_propget svn:ignore .././deeply/nested ../prop.expect
+	'
 
 cat >prop.expect <<\EOF
 Properties on '.':
@@ -218,8 +223,11 @@ Properties on 'nested/directory/.keep':
 EOF
 
 test_expect_success 'test proplist' "
-	git svn proplist . | cmp - prop.expect &&
-	git svn proplist nested/directory/.keep | cmp - prop2.expect
+	git svn proplist . >actual &&
+	cmp prop.expect actual &&
+
+	git svn proplist nested/directory/.keep >actual &&
+	cmp prop2.expect actual
 	"
 
 test_done