[PATCH] http: use internal argv_array of struct child_process

[PATCH] http: use internal argv_array of struct child_process

[René Scharfe]

Avoid a strangely magic array size (it's slightly too big) and explicit
index numbers by building the command line for index-pack using the
embedded argv_array of the child_process.  The resulting code is shorter
and easier to extend.

Signed-off-by: Rene Scharfe <l.s.r@web.de>
---
 http.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/http.c b/http.c
index 215bebef1b..b22b4ada58 100644
--- a/http.c
+++ b/http.c
@@ -2025,7 +2025,6 @@ int finish_http_pack_request(struct http_pack_request *preq)
 	char *tmp_idx;
 	size_t len;
 	struct child_process ip = CHILD_PROCESS_INIT;
-	const char *ip_argv[8];
 
 	close_pack_index(p);
 
@@ -2041,13 +2040,10 @@ int finish_http_pack_request(struct http_pack_request *preq)
 		die("BUG: pack tmpfile does not end in .pack.temp?");
 	tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile);
 
-	ip_argv[0] = "index-pack";
-	ip_argv[1] = "-o";
-	ip_argv[2] = tmp_idx;
-	ip_argv[3] = preq->tmpfile;
-	ip_argv[4] = NULL;
-
-	ip.argv = ip_argv;
+	argv_array_push(&ip.args, "index-pack");
+	argv_array_push(&ip.args, "-o");
+	argv_array_push(&ip.args, tmp_idx);
+	argv_array_push(&ip.args, preq->tmpfile);
 	ip.git_cmd = 1;
 	ip.no_stdin = 1;
 	ip.no_stdout = 1;
-- 
2.15.1

Re: [PATCH] http: use internal argv_array of struct child_process

[Eric Sunshine]

On Fri, Dec 22, 2017 at 3:14 AM, René Scharfe <l.s.r@web.de> wrote:
> Avoid a strangely magic array size (it's slightly too big) and explicit
> index numbers by building the command line for index-pack using the
> embedded argv_array of the child_process.  The resulting code is shorter
> and easier to extend.
>
> Signed-off-by: Rene Scharfe <l.s.r@web.de>
> ---
> diff --git a/http.c b/http.c
> @@ -2041,13 +2040,10 @@ int finish_http_pack_request(struct http_pack_request *preq)
> -       ip_argv[0] = "index-pack";
> -       ip_argv[1] = "-o";
> -       ip_argv[2] = tmp_idx;
> -       ip_argv[3] = preq->tmpfile;
> -       ip_argv[4] = NULL;
> -
> -       ip.argv = ip_argv;
> +       argv_array_push(&ip.args, "index-pack");
> +       argv_array_push(&ip.args, "-o");
> +       argv_array_push(&ip.args, tmp_idx);
> +       argv_array_push(&ip.args, preq->tmpfile);

Not necessarily worth a re-roll, but using the "pushl" variant would
make it clear that "-o" and tmp_idx are related and would ensure that
they don't accidentally get split up if someone inserts a new "push"
in the sequence in the future.

    argv_array_push(&ip.args, "index-pack");
    argv_array_pushl(&ip.args, "-o", tmp_idx, NULL);
    argv_array_push(&ip.args, preq->tmpfile);

[PATCH v2] http: use internal argv_array of struct child_process

[René Scharfe]

Avoid a strangely magic array size (it's slightly too big) and explicit
index numbers by building the command line for index-pack using the
embedded argv_array of the child_process.  Add the flag -o and its
argument with argv_array_pushl() to make it obvious that they belong
together.  The resulting code is shorter and easier to extend.

Helped-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Rene Scharfe <l.s.r@web.de>
---
Change from v1: use argv_array_pushl for -o and tmp_idx.

Thanks, Eric, good idea!

 http.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/http.c b/http.c
index 215bebef1b..9f2fcc9ec4 100644
--- a/http.c
+++ b/http.c
@@ -2025,7 +2025,6 @@ int finish_http_pack_request(struct http_pack_request *preq)
 	char *tmp_idx;
 	size_t len;
 	struct child_process ip = CHILD_PROCESS_INIT;
-	const char *ip_argv[8];
 
 	close_pack_index(p);
 
@@ -2041,13 +2040,9 @@ int finish_http_pack_request(struct http_pack_request *preq)
 		die("BUG: pack tmpfile does not end in .pack.temp?");
 	tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile);
 
-	ip_argv[0] = "index-pack";
-	ip_argv[1] = "-o";
-	ip_argv[2] = tmp_idx;
-	ip_argv[3] = preq->tmpfile;
-	ip_argv[4] = NULL;
-
-	ip.argv = ip_argv;
+	argv_array_push(&ip.args, "index-pack");
+	argv_array_pushl(&ip.args, "-o", tmp_idx, NULL);
+	argv_array_push(&ip.args, preq->tmpfile);
 	ip.git_cmd = 1;
 	ip.no_stdin = 1;
 	ip.no_stdout = 1;
-- 
2.15.1