run-command API users: use strvec_pushv(), not argv assignment

Migrate those run-command API users that assign directly to the "argv"
member to use a strvec_pushv() of "args" instead.

In these cases it did not make sense to further refactor these
callers, e.g. daemon.c could be made to construct the arguments closer
to handle(), but that would require moving the construction from its
cmd_main() and pass "argv" through two intermediate functions.

It would be possible for a change like this to introduce a regression
if we were doing:

      cp.argv = argv;
      argv[1] = "foo";

And changed the code, as is being done here, to:

      strvec_pushv(&cp.args, argv);
      argv[1] = "foo";

But as viewing this change with the "-W" flag reveals none of these
functions modify variable that's being pushed afterwards in a way that
would introduce such a logic error.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

7 files changed, 10 insertions, 9 deletions

diff --git a/add-patch.c b/add-patch.c
index 8c41cdfe39..573eef0cc4 100644
--- a/add-patch.c
+++ b/add-patch.c
@@ -413,7 +413,7 @@ static int parse_diff(struct add_p_state *s, const struct pathspec *ps)
 		strvec_push(&args, ps->items[i].original);
 
 	setup_child_process(s, &cp, NULL);
-	cp.argv = args.v;
+	strvec_pushv(&cp.args, args.v);
 	res = capture_command(&cp, plain, 0);
 	if (res) {
 		strvec_clear(&args);
@@ -431,7 +431,7 @@ static int parse_diff(struct add_p_state *s, const struct pathspec *ps)
 
 		setup_child_process(s, &colored_cp, NULL);
 		xsnprintf((char *)args.v[color_arg_index], 8, "--color");
-		colored_cp.argv = args.v;
+		strvec_pushv(&colored_cp.args, args.v);
 		colored = &s->colored;
 		res = capture_command(&colored_cp, colored, 0);
 		strvec_clear(&args);
diff --git a/daemon.c b/daemon.c
index b1fcbe0d6f..8df21f2130 100644
--- a/daemon.c
+++ b/daemon.c
@@ -922,7 +922,7 @@ static void handle(int incoming, struct sockaddr *addr, socklen_t addrlen)
 #endif
 	}
 
-	cld.argv = cld_argv.v;
+	strvec_pushv(&cld.args, cld_argv.v);
 	cld.in = incoming;
 	cld.out = dup(incoming);
 
diff --git a/http-backend.c b/http-backend.c
index 3d6e2ff17f..4dd4d939f8 100644
--- a/http-backend.c
+++ b/http-backend.c
@@ -480,7 +480,7 @@ static void run_service(const char **argv, int buffer_input)
 		strvec_pushf(&cld.env_array,
 			     "GIT_COMMITTER_EMAIL=%s@http.%s", user, host);
 
-	cld.argv = argv;
+	strvec_pushv(&cld.args, argv);
 	if (buffer_input || gzipped_request || req_len >= 0)
 		cld.in = -1;
 	cld.git_cmd = 1;
diff --git a/http.c b/http.c
index f92859f43f..229da4d148 100644
--- a/http.c
+++ b/http.c
@@ -2126,8 +2126,9 @@ int finish_http_pack_request(struct http_pack_request *preq)
 
 	ip.git_cmd = 1;
 	ip.in = tmpfile_fd;
-	ip.argv = preq->index_pack_args ? preq->index_pack_args
-					: default_index_pack_args;
+	strvec_pushv(&ip.args, preq->index_pack_args ?
+		     preq->index_pack_args :
+		     default_index_pack_args);
 
 	if (preq->preserve_index_pack_stdout)
 		ip.out = 0;
diff --git a/remote-curl.c b/remote-curl.c
index d69156312b..0dabef2dd7 100644
--- a/remote-curl.c
+++ b/remote-curl.c
@@ -1061,7 +1061,7 @@ static int rpc_service(struct rpc_state *rpc, struct discovery *heads,
 	client.in = -1;
 	client.out = -1;
 	client.git_cmd = 1;
-	client.argv = client_argv;
+	strvec_pushv(&client.args, client_argv);
 	if (start_command(&client))
 		exit(1);
 	write_or_die(client.in, preamble->buf, preamble->len);
diff --git a/run-command.c b/run-command.c
index f40df01c77..620a06ca2f 100644
--- a/run-command.c
+++ b/run-command.c
@@ -1039,7 +1039,7 @@ int run_command_v_opt_cd_env_tr2(const char **argv, int opt, const char *dir,
 				 const char *const *env, const char *tr2_class)
 {
 	struct child_process cmd = CHILD_PROCESS_INIT;
-	cmd.argv = argv;
+	strvec_pushv(&cmd.args, argv);
 	cmd.no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0;
 	cmd.git_cmd = opt & RUN_GIT_CMD ? 1 : 0;
 	cmd.stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0;
diff --git a/t/helper/test-subprocess.c b/t/helper/test-subprocess.c
index 92b69de635..ff22f2fa2c 100644
--- a/t/helper/test-subprocess.c
+++ b/t/helper/test-subprocess.c
@@ -15,6 +15,6 @@ int cmd__subprocess(int argc, const char **argv)
 		argv++;
 	}
 	cp.git_cmd = 1;
-	cp.argv = (const char **)argv + 1;
+	strvec_pushv(&cp.args, (const char **)argv + 1);
 	return run_command(&cp);
 }