[PATCH v2] Test t5560: Fix test when run with dash

[Tarmigan Casebolt <tarmigan+git@gmail.com>]

The dash shell is more finicky than some others.

In particular, it does not seem to like the pattern of setting an
environment variable on the same line as you call a shell function
like this:

        REQUEST_METHOD="GET" some_shell_function

as you might use to set a variable only for one command if that
command were an executable or a shell builtin.

Reported-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Tarmigan Casebolt <tarmigan+git@gmail.com>
---
Junio, that description matches my understanding of the problem.
I can't tell from my reading of the POSIX spec whether my usage was
wrong or if dash is wrong, which is why I shied away from an
explanation.  As a practical matter though, this patch does fix the
issue.

This version takes a slighty different approach that I think leaves
things clearer and doesn't pass in tons of arguements to the shell
function.  If you prefer the old approach, I can send a patch that way
instead.
---
 t/t5560-http-backend-noserver.sh |   15 ++++++++++-----
 1 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/t/t5560-http-backend-noserver.sh b/t/t5560-http-backend-noserver.sh
index 5f8c88e..44885b8 100755
--- a/t/t5560-http-backend-noserver.sh
+++ b/t/t5560-http-backend-noserver.sh
@@ -14,8 +14,9 @@ run_backend() {
 }
 
 GET() {
-	REQUEST_METHOD="GET" \
+	export REQUEST_METHOD="GET" &&
 	run_backend "/repo.git/$1" &&
+	unset REQUEST_METHOD &&
 	if ! grep "Status" act.out >act
 	then
 		printf "Status: 200 OK\r\n" >act
@@ -25,9 +26,11 @@ GET() {
 }
 
 POST() {
-	REQUEST_METHOD="POST" \
-	CONTENT_TYPE="application/x-$1-request" \
+	export REQUEST_METHOD="POST" &&
+	export CONTENT_TYPE="application/x-$1-request" &&
 	run_backend "/repo.git/$1" "$2" &&
+	unset REQUEST_METHOD &&
+	unset CONTENT_TYPE &&
 	if ! grep "Status" act.out >act
 	then
 		printf "Status: 200 OK\r\n" >act
@@ -43,13 +46,15 @@ log_div() {
 . "$TEST_DIRECTORY"/t556x_common
 
 expect_aliased() {
+	export REQUEST_METHOD="GET" &&
 	if test $1 = 0; then
-		REQUEST_METHOD=GET run_backend "$2"
+		run_backend "$2"
 	else
-		REQUEST_METHOD=GET run_backend "$2" &&
+		run_backend "$2" &&
 		echo "fatal: '$2': aliased" >exp.err &&
 		test_cmp exp.err act.err
 	fi
+	unset REQUEST_METHOD
 }
 
 test_expect_success 'http-backend blocks bad PATH_INFO' '
-- 
1.6.6