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[WIP 1/8] tests: define GIT_TEST_PROTOCOL_VERSION

From
JTJonathan Tan <jonathantanmy@google.com>
Date
Jan 16, 2019, 22:42 UTC
Message-ID
<241afc6b556334fe212147e94167e3f23d4e21f5.1547677183.git.jonathantanmy@google.com>
In-Reply-To
<cover.1547677183.git.jonathantanmy@google.com>

Define a GIT_TEST_PROTOCOL_VERSION environment variable meant to be used from tests. When set, this ensures protocol.version is at least the given value, allowing the entire test suite to be run as if this configuration is in place for all repositories.

As of this patch, all tests pass whether GIT_TEST_PROTOCOL_VERSION is unset, set to 0, or set to 1. Some tests fail when GIT_TEST_PROTOCOL_VERSION is set to 2, but this will be dealt with in subsequent patches.

This is based on work by Ævar Arnfjörð Bjarmason.
Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
---
 protocol.c                  | 17 +++++++++++++++--
 t/README                    |  3 +++
 t/t5400-send-pack.sh        |  2 +-
 t/t5551-http-fetch-smart.sh |  3 ++-
 4 files changed, 21 insertions(+), 4 deletions(-)
diff --git a/protocol.c b/protocol.c
index 5664bd7a05..c7a735bfa2 100644
--- a/protocol.c
+++ b/protocol.c
@@ -42,6 +42,10 @@ static const char *format_protocol_version(enum protocol_version version)
 enum protocol_version get_protocol_version_config(void)
 {
 	const char *value;
+	enum protocol_version retval = protocol_v0;
+	const char *git_test_k = "GIT_TEST_PROTOCOL_VERSION";
+	const char *git_test_v = getenv(git_test_k);
+
 	if (!git_config_get_string_const("protocol.version", &value)) {
 		enum protocol_version version = parse_protocol_version(value);
 
@@ -49,10 +53,19 @@ enum protocol_version get_protocol_version_config(void)
 			die("unknown value for config 'protocol.version': %s",
 			    value);
 
-		return version;
+		retval = version;
+	}
+
+	if (git_test_v && strlen(git_test_v)) {
+		enum protocol_version env = parse_protocol_version(git_test_v);
+
+		if (env == protocol_unknown_version)
+			die("unknown value for %s: %s", git_test_k, git_test_v);
+		if (retval < env)
+			retval = env;
 	}
 
-	return protocol_v0;
+	return retval;
 }
 
 void register_allowed_protocol_version(enum protocol_version version)
diff --git a/t/README b/t/README
index 28711cc508..fd7f29cbe1 100644
--- a/t/README
+++ b/t/README
@@ -311,6 +311,9 @@ marked strings" in po/README for details.
 GIT_TEST_SPLIT_INDEX=<boolean> forces split-index mode on the whole
 test suite. Accept any boolean values that are accepted by git-config.
 
+GIT_TEST_PROTOCOL_VERSION=<n>, when set, overrides the
+'protocol.version' setting to n if it is less than n.
+
 GIT_TEST_FULL_IN_PACK_ARRAY=<boolean> exercises the uncommon
 pack-objects code path where there are more than 1024 packs even if
 the actual number of packs in repository is below this limit. Accept
diff --git a/t/t5400-send-pack.sh b/t/t5400-send-pack.sh
index f1932ea431..571d620aed 100755
--- a/t/t5400-send-pack.sh
+++ b/t/t5400-send-pack.sh
@@ -288,7 +288,7 @@ test_expect_success 'receive-pack de-dupes .have lines' '
 	$shared .have
 	EOF
 
-	GIT_TRACE_PACKET=$(pwd)/trace \
+	GIT_TRACE_PACKET=$(pwd)/trace GIT_TEST_PROTOCOL_VERSION= \
 	    git push \
 		--receive-pack="unset GIT_TRACE_PACKET; git-receive-pack" \
 		fork HEAD:foo &&
diff --git a/t/t5551-http-fetch-smart.sh b/t/t5551-http-fetch-smart.sh
index a60dd907bd..8f620e0a35 100755
--- a/t/t5551-http-fetch-smart.sh
+++ b/t/t5551-http-fetch-smart.sh
@@ -44,7 +44,8 @@ test_expect_success 'clone http repository' '
 	< Cache-Control: no-cache, max-age=0, must-revalidate
 	< Content-Type: application/x-git-upload-pack-result
 	EOF
-	GIT_TRACE_CURL=true git clone --quiet $HTTPD_URL/smart/repo.git clone 2>err &&
+	GIT_TRACE_CURL=true GIT_TEST_PROTOCOL_VERSION= \
+		git clone --quiet $HTTPD_URL/smart/repo.git clone 2>err &&
 	test_cmp file clone/file &&
 	tr '\''\015'\'' Q <err |
 	sed -e "
-- 
2.19.0.271.gfe8321ec05.dirty
Previous: Jonathan TanNext: Jonathan Tan
Message 2 of 12 in “[WIP 0/8] Trying to revive GIT_TEST_PROTOCOL_VERSION”
  1. Jonathan TanJan 16, 2019
  2. 1/8 tests: define GIT_TEST_PROTOCOL_VERSIONJonathan Tan, Jan 16, 2019
  3. 2/8 tests: always test fetch of unreachable with v0Jonathan Tan, Jan 16, 2019
  4. 3/8 t5503: fix overspecification of trace expectationJonathan Tan, Jan 16, 2019
  5. 4/8 t5512: compensate for v0 only sending HEAD symrefsJonathan Tan, Jan 16, 2019
  6. 5/8 t5700: only run with protocol version 1Jonathan Tan, Jan 16, 2019
  7. 6/8 tests: fix protocol version for overspecificationsJonathan Tan, Jan 16, 2019
  8. 7/8 t5552: compensate for v2 filtering ref adv.Jonathan Tan, Jan 16, 2019
  9. 8/8 remote-curl: in v2, fill credentials if neededJonathan Tan, Jan 16, 2019
  10. Ævar Arnfjörð BjarmasonJan 17, 2019
  11. Jonathan TanJan 17, 2019
  12. Junio C HamanoJan 17, 2019

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