[PATCH 2/2] t0000: avoid masking git exit value through pipes

["Carlo Marcelo Arenas Belón" <carenas@gmail.com>]

9af0b8dbe2 (t0000-basic: more commit-tree tests., 2006-04-26) adds
tets for commit-tree that mask the return exit from git as described
in a378fee5b07.

Fix the tests, to avoid pipes by using instead a temporary file.

Signed-off-by: Carlo Marcelo Arenas Belón <carenas@gmail.com>
---
 t/t0000-basic.sh | 23 ++++++++++++++---------
 1 file changed, 14 insertions(+), 9 deletions(-)

diff --git a/t/t0000-basic.sh b/t/t0000-basic.sh
index cb87768513..545ff5af13 100755
--- a/t/t0000-basic.sh
+++ b/t/t0000-basic.sh
@@ -1270,26 +1270,31 @@ test_expect_success 'no diff after checkout and git update-index --refresh' '
 P=$(test_oid root)
 
 test_expect_success 'git commit-tree records the correct tree in a commit' '
-	commit0=$(echo NO | git commit-tree $P) &&
-	tree=$(git show --pretty=raw $commit0 |
-		 sed -n -e "s/^tree //p" -e "/^author /q") &&
+	echo NO | git commit-tree $P >out &&
+	commit0=$(cat out) &&
+	git show --pretty=raw $commit0 >out &&
+	tree=$(cat out | sed -n -e "s/^tree //p" -e "/^author /q") &&
 	test "z$tree" = "z$P"
 '
 
 test_expect_success 'git commit-tree records the correct parent in a commit' '
-	commit1=$(echo NO | git commit-tree $P -p $commit0) &&
-	parent=$(git show --pretty=raw $commit1 |
-		sed -n -e "s/^parent //p" -e "/^author /q") &&
+	echo NO | git commit-tree $P -p $commit0 >out &&
+	commit1=$(cat out) &&
+	git show --pretty=raw $commit1 >out &&
+	parent=$(cat out | sed -n -e "s/^parent //p" -e "/^author /q") &&
 	test "z$commit0" = "z$parent"
 '
 
 test_expect_success 'git commit-tree omits duplicated parent in a commit' '
-	commit2=$(echo NO | git commit-tree $P -p $commit0 -p $commit0) &&
-	     parent=$(git show --pretty=raw $commit2 |
+	echo NO | git commit-tree $P -p $commit0 -p $commit0 >out &&
+	commit2=$(cat out) &&
+	git show --pretty=raw $commit2 >out &&
+	parent=$(cat out |
 		sed -n -e "s/^parent //p" -e "/^author /q" |
 		sort -u) &&
 	test "z$commit0" = "z$parent" &&
-	numparent=$(git show --pretty=raw $commit2 |
+	git show --pretty=raw $commit2 >out &&
+	numparent=$(cat out |
 		sed -n -e "s/^parent //p" -e "/^author /q" |
 		wc -l) &&
 	test $numparent = 1
-- 
2.33.0.481.g26d3bed244