[PATCH v8 3/3] submodule: ensure that -c http.extraheader is heeded

[Johannes Schindelin <johannes.schindelin@gmx.de>]

To support this developer's use case of allowing build agents token-based
access to private repositories, we introduced the http.extraheader
feature, allowing extra HTTP headers to be sent along with every HTTP
request.

This patch verifies that we can configure these extra HTTP headers via the
command-line for use with `git submodule update`, too. Example: git -c
http.extraheader="Secret: Sauce" submodule update --init

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 t/t5551-http-fetch-smart.sh | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/t/t5551-http-fetch-smart.sh b/t/t5551-http-fetch-smart.sh
index 43b257e..2f375eb 100755
--- a/t/t5551-http-fetch-smart.sh
+++ b/t/t5551-http-fetch-smart.sh
@@ -287,7 +287,16 @@ test_expect_success 'custom http headers' '
 		fetch "$HTTPD_URL/smart_headers/repo.git" &&
 	git -c http.extraheader="x-magic-one: abra" \
 	    -c http.extraheader="x-magic-two: cadabra" \
-	    fetch "$HTTPD_URL/smart_headers/repo.git"
+	    fetch "$HTTPD_URL/smart_headers/repo.git" &&
+	git update-index --add --cacheinfo 160000,$(git rev-parse HEAD),sub &&
+	git config -f .gitmodules submodule.sub.path sub &&
+	git config -f .gitmodules submodule.sub.url \
+		"$HTTPD_URL/smart_headers/repo.git" &&
+	git submodule init sub &&
+	test_must_fail git submodule update sub &&
+	git -c http.extraheader="x-magic-one: abra" \
+	    -c http.extraheader="x-magic-two: cadabra" \
+		submodule update sub
 '
 
 stop_httpd
-- 
2.8.2.463.g99156ee