[PATCH 2/1] do not pass "git -c foo=bar" params to transport helpers

[Jonathan Nieder <jrnieder@gmail.com>]

Like $GIT_CONFIG, $GIT_CONFIG_PARAMETERS needs to be suppressed by
"git push" and its cousins when running local transport helpers to
imitate remote transport well.

Noticed-by: Jeff King <peff@peff.net>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
---
Jeff King wrote:

> Here's a first attempt. No idea if it has any bad side effects. :)

Here's the transport boundary.

 cache.h              |    3 ++-
 config.c             |    8 ++++----
 environment.c        |    1 +
 t/t5400-send-pack.sh |   23 +++++++++++++++++++++++
 4 files changed, 30 insertions(+), 5 deletions(-)

diff --git a/cache.h b/cache.h
index 6f50ea8..181a305 100644
--- a/cache.h
+++ b/cache.h
@@ -379,6 +379,7 @@ static inline enum object_type object_type(unsigned int mode)
 #define GRAFT_ENVIRONMENT "GIT_GRAFT_FILE"
 #define TEMPLATE_DIR_ENVIRONMENT "GIT_TEMPLATE_DIR"
 #define CONFIG_ENVIRONMENT "GIT_CONFIG"
+#define CONFIG_DATA_ENVIRONMENT "GIT_CONFIG_PARAMETERS"
 #define EXEC_PATH_ENVIRONMENT "GIT_EXEC_PATH"
 #define CEILING_DIRECTORIES_ENVIRONMENT "GIT_CEILING_DIRECTORIES"
 #define NO_REPLACE_OBJECTS_ENVIRONMENT "GIT_NO_REPLACE_OBJECTS"
@@ -397,7 +398,7 @@ static inline enum object_type object_type(unsigned int mode)
  * environment creation or simple walk of the list.
  * The number of non-NULL entries is available as a macro.
  */
-#define LOCAL_REPO_ENV_SIZE 8
+#define LOCAL_REPO_ENV_SIZE 9
 extern const char *const local_repo_env[LOCAL_REPO_ENV_SIZE + 1];
 
 extern int is_bare_repository_cfg;
diff --git a/config.c b/config.c
index e08e32b..c2c995f 100644
--- a/config.c
+++ b/config.c
@@ -38,13 +38,13 @@ static void lowercase(char *p)
 void git_config_push_parameter(const char *text)
 {
 	struct strbuf env = STRBUF_INIT;
-	const char *old = getenv("GIT_CONFIG_PARAMETERS");
+	const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
 	if (old) {
 		strbuf_addstr(&env, old);
 		strbuf_addch(&env, ' ');
 	}
 	sq_quote_buf(&env, text);
-	setenv("GIT_CONFIG_PARAMETERS", env.buf, 1);
+	setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
 	strbuf_release(&env);
 }
 
@@ -76,7 +76,7 @@ int git_config_parse_parameter(const char *text)
 }
 
 int git_config_parse_environment(void) {
-	const char *env = getenv("GIT_CONFIG_PARAMETERS");
+	const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
 	char *envw;
 	const char **argv = NULL;
 	int nr = 0, alloc = 0;
@@ -89,7 +89,7 @@ int git_config_parse_environment(void) {
 
 	if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
 		free(envw);
-		return error("bogus format in GIT_CONFIG_PARAMETERS");
+		return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
 	}
 
 	for (i = 0; i < nr; i++) {
diff --git a/environment.c b/environment.c
index 83d38d3..a199f63 100644
--- a/environment.c
+++ b/environment.c
@@ -72,6 +72,7 @@ static char *git_object_dir, *git_index_file, *git_refs_dir, *git_graft_file;
 const char * const local_repo_env[LOCAL_REPO_ENV_SIZE + 1] = {
 	ALTERNATE_DB_ENVIRONMENT,
 	CONFIG_ENVIRONMENT,
+	CONFIG_DATA_ENVIRONMENT,
 	DB_ENVIRONMENT,
 	GIT_DIR_ENVIRONMENT,
 	GIT_WORK_TREE_ENVIRONMENT,
diff --git a/t/t5400-send-pack.sh b/t/t5400-send-pack.sh
index c718253..5bcf0b8 100755
--- a/t/t5400-send-pack.sh
+++ b/t/t5400-send-pack.sh
@@ -94,6 +94,29 @@ test_expect_success 'refuse deleting push with denyDeletes' '
 	test_must_fail git send-pack ./victim :extra master
 '
 
+test_expect_success 'cannot override denyDeletes with git -c send-pack' '
+	(
+		cd victim &&
+		test_might_fail git branch -D extra &&
+		git config receive.denyDeletes true &&
+		git branch extra master
+	) &&
+	test_must_fail git -c receive.denyDeletes=false \
+					send-pack ./victim :extra master
+'
+
+test_expect_success 'override denyDeletes with git -c receive-pack' '
+	(
+		cd victim &&
+		test_might_fail git branch -D extra &&
+		git config receive.denyDeletes true &&
+		git branch extra master
+	) &&
+	git send-pack \
+		--receive-pack="git -c receive.denyDeletes=false receive-pack" \
+		./victim :extra master
+'
+
 test_expect_success 'denyNonFastforwards trumps --force' '
 	(
 	    cd victim &&
-- 
1.7.2.2