[PATCH 3/3] t5551: test server-side ERR packet

[Jeff King <peff@peff.net>]

From: Josh Steadmon <steadmon@google.com>

When a smart HTTP server sends an error message via pkt-line, we detect
the error due to using PACKET_READ_DIE_ON_ERR_PACKET. This case was
added by 2d103c31c2 (pack-protocol.txt: accept error packets in any
context, 2018-12-29), but not covered by tests.

Signed-off-by: Josh Steadmon <steadmon@google.com>
Signed-off-by: Jeff King <peff@peff.net>
---
 t/lib-httpd.sh                  | 1 +
 t/lib-httpd/apache.conf         | 4 ++++
 t/lib-httpd/error-smart-http.sh | 3 +++
 t/t5551-http-fetch-smart.sh     | 5 +++++
 4 files changed, 13 insertions(+)
 create mode 100644 t/lib-httpd/error-smart-http.sh

diff --git a/t/lib-httpd.sh b/t/lib-httpd.sh
index e465116ef9..216281eabc 100644
--- a/t/lib-httpd.sh
+++ b/t/lib-httpd.sh
@@ -131,6 +131,7 @@ prepare_httpd() {
 	mkdir -p "$HTTPD_DOCUMENT_ROOT_PATH"
 	cp "$TEST_PATH"/passwd "$HTTPD_ROOT_PATH"
 	install_script broken-smart-http.sh
+	install_script error-smart-http.sh
 	install_script error.sh
 	install_script apply-one-time-sed.sh
 
diff --git a/t/lib-httpd/apache.conf b/t/lib-httpd/apache.conf
index 5d63ed90c5..06a81b54c7 100644
--- a/t/lib-httpd/apache.conf
+++ b/t/lib-httpd/apache.conf
@@ -119,6 +119,7 @@ Alias /auth/dumb/ www/auth/dumb/
 ScriptAliasMatch /error_git_upload_pack/(.*)/git-upload-pack error.sh/
 ScriptAliasMatch /smart_*[^/]*/(.*) ${GIT_EXEC_PATH}/git-http-backend/$1
 ScriptAlias /broken_smart/ broken-smart-http.sh/
+ScriptAlias /error_smart/ error-smart-http.sh/
 ScriptAlias /error/ error.sh/
 ScriptAliasMatch /one_time_sed/(.*) apply-one-time-sed.sh/$1
 <Directory ${GIT_EXEC_PATH}>
@@ -127,6 +128,9 @@ ScriptAliasMatch /one_time_sed/(.*) apply-one-time-sed.sh/$1
 <Files broken-smart-http.sh>
 	Options ExecCGI
 </Files>
+<Files error-smart-http.sh>
+	Options ExecCGI
+</Files>
 <Files error.sh>
   Options ExecCGI
 </Files>
diff --git a/t/lib-httpd/error-smart-http.sh b/t/lib-httpd/error-smart-http.sh
new file mode 100644
index 0000000000..e65d447fc4
--- /dev/null
+++ b/t/lib-httpd/error-smart-http.sh
@@ -0,0 +1,3 @@
+echo "Content-Type: application/x-git-upload-pack-advertisement"
+echo
+printf "%s" "0019ERR server-side error"
diff --git a/t/t5551-http-fetch-smart.sh b/t/t5551-http-fetch-smart.sh
index 8630b0cc39..ba83e567e5 100755
--- a/t/t5551-http-fetch-smart.sh
+++ b/t/t5551-http-fetch-smart.sh
@@ -429,5 +429,10 @@ test_expect_success 'GIT_TRACE_CURL_NO_DATA prevents data from being traced' '
 	! grep "=> Send data" err
 '
 
+test_expect_success 'server-side error detected' '
+	test_must_fail git clone $HTTPD_URL/error_smart/repo.git 2>actual &&
+	grep "server-side error" actual
+'
+
 stop_httpd
 test_done
-- 
2.20.1.1122.g2972e48916