run-command API users: use strvec_pushl(), not argv construction

Change a pattern of hardcoding an "argv" array size, populating it and
assigning to the "argv" member of "struct child_process" to instead
use "strvec_pushl()" to add data to the "args" member.

This implements the same behavior as before in fewer lines of code,
and moves us further towards being able to remove the "argv" member in
a subsequent commit.

Since we've entirely removed the "argv" variable(s) we can be sure
that no potential logic errors of the type discussed in a preceding
commit are being introduced here, i.e. ones where the local "argv" was
being modified after the assignment to "struct child_process"'s
"argv".

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

1 files changed, 1 insertions, 2 deletions

diff --git a/builtin/replace.c b/builtin/replace.c
index 946938d011..6ff1734d58 100644
--- a/builtin/replace.c
+++ b/builtin/replace.c
@@ -258,11 +258,10 @@ static int import_object(struct object_id *oid, enum object_type type,
 		return error_errno(_("unable to open %s for reading"), filename);
 
 	if (!raw && type == OBJ_TREE) {
-		const char *argv[] = { "mktree", NULL };
 		struct child_process cmd = CHILD_PROCESS_INIT;
 		struct strbuf result = STRBUF_INIT;
 
-		cmd.argv = argv;
+		strvec_push(&cmd.args, "mktree");
 		cmd.git_cmd = 1;
 		cmd.in = fd;
 		cmd.out = -1;