Subject: Re: [PATCH 2/2] use env_array member of struct child_process

From: René Scharfe <[email-masked]>
Date: Sun, 09 Nov 2014 14:49:54 +0100

Am 20.10.2014 um 11:19 schrieb Jeff King:
> On Sun, Oct 19, 2014 at 01:14:20PM +0200, René Scharfe wrote:
> 
>> --- a/wt-status.c
>> +++ b/wt-status.c
>> @@ -726,14 +726,14 @@ static void wt_status_print_changed(struct wt_status *s)
>>   static void wt_status_print_submodule_summary(struct wt_status *s, int uncommitted)
>>   {
>>   	struct child_process sm_summary = CHILD_PROCESS_INIT;
>> -	struct argv_array env = ARGV_ARRAY_INIT;
>>   	struct argv_array argv = ARGV_ARRAY_INIT;
> 
> I don't think it belongs in this patch, but a follow-on 3/2 might be to
> give argv the same treatment.

Yes, good idea.

-- >8 --
Subject: [PATCH] use args member of struct child_process

Convert users of struct child_process to using the managed argv_array
args instead of providing their own.  This shortens the code a bit and
ensures that the allocated memory is released automatically after use.

Suggested-by: Jeff King <[email-masked]>
Signed-off-by: Rene Scharfe <[email-masked]>
---
 builtin/repack.c | 47 ++++++++++++++++++++++-------------------------
 wt-status.c      | 17 +++++++----------
 2 files changed, 29 insertions(+), 35 deletions(-)

diff --git a/builtin/repack.c b/builtin/repack.c
index 2845620..83e91c7 100644
--- a/builtin/repack.c
+++ b/builtin/repack.c
@@ -135,7 +135,6 @@ int cmd_repack(int argc, const char **argv, const char *prefix)
 	};
 	struct child_process cmd = CHILD_PROCESS_INIT;
 	struct string_list_item *item;
-	struct argv_array cmd_args = ARGV_ARRAY_INIT;
 	struct string_list names = STRING_LIST_INIT_DUP;
 	struct string_list rollback = STRING_LIST_INIT_NODUP;
 	struct string_list existing_packs = STRING_LIST_INIT_DUP;
@@ -202,56 +201,55 @@ int cmd_repack(int argc, const char **argv, const char *prefix)
 
 	sigchain_push_common(remove_pack_on_signal);
 
-	argv_array_push(&cmd_args, "pack-objects");
-	argv_array_push(&cmd_args, "--keep-true-parents");
+	argv_array_push(&cmd.args, "pack-objects");
+	argv_array_push(&cmd.args, "--keep-true-parents");
 	if (!pack_kept_objects)
-		argv_array_push(&cmd_args, "--honor-pack-keep");
-	argv_array_push(&cmd_args, "--non-empty");
-	argv_array_push(&cmd_args, "--all");
-	argv_array_push(&cmd_args, "--reflog");
-	argv_array_push(&cmd_args, "--indexed-objects");
+		argv_array_push(&cmd.args, "--honor-pack-keep");
+	argv_array_push(&cmd.args, "--non-empty");
+	argv_array_push(&cmd.args, "--all");
+	argv_array_push(&cmd.args, "--reflog");
+	argv_array_push(&cmd.args, "--indexed-objects");
 	if (window)
-		argv_array_pushf(&cmd_args, "--window=%s", window);
+		argv_array_pushf(&cmd.args, "--window=%s", window);
 	if (window_memory)
-		argv_array_pushf(&cmd_args, "--window-memory=%s", window_memory);
+		argv_array_pushf(&cmd.args, "--window-memory=%s", window_memory);
 	if (depth)
-		argv_array_pushf(&cmd_args, "--depth=%s", depth);
+		argv_array_pushf(&cmd.args, "--depth=%s", depth);
 	if (max_pack_size)
-		argv_array_pushf(&cmd_args, "--max-pack-size=%s", max_pack_size);
+		argv_array_pushf(&cmd.args, "--max-pack-size=%s", max_pack_size);
 	if (no_reuse_delta)
-		argv_array_pushf(&cmd_args, "--no-reuse-delta");
+		argv_array_pushf(&cmd.args, "--no-reuse-delta");
 	if (no_reuse_object)
-		argv_array_pushf(&cmd_args, "--no-reuse-object");
+		argv_array_pushf(&cmd.args, "--no-reuse-object");
 	if (write_bitmaps)
-		argv_array_push(&cmd_args, "--write-bitmap-index");
+		argv_array_push(&cmd.args, "--write-bitmap-index");
 
 	if (pack_everything & ALL_INTO_ONE) {
 		get_non_kept_pack_filenames(&existing_packs);
 
 		if (existing_packs.nr && delete_redundant) {
 			if (unpack_unreachable)
-				argv_array_pushf(&cmd_args,
+				argv_array_pushf(&cmd.args,
 						"--unpack-unreachable=%s",
 						unpack_unreachable);
 			else if (pack_everything & LOOSEN_UNREACHABLE)
-				argv_array_push(&cmd_args,
+				argv_array_push(&cmd.args,
 						"--unpack-unreachable");
 		}
 	} else {
-		argv_array_push(&cmd_args, "--unpacked");
-		argv_array_push(&cmd_args, "--incremental");
+		argv_array_push(&cmd.args, "--unpacked");
+		argv_array_push(&cmd.args, "--incremental");
 	}
 
 	if (local)
-		argv_array_push(&cmd_args,  "--local");
+		argv_array_push(&cmd.args,  "--local");
 	if (quiet)
-		argv_array_push(&cmd_args,  "--quiet");
+		argv_array_push(&cmd.args,  "--quiet");
 	if (delta_base_offset)
-		argv_array_push(&cmd_args,  "--delta-base-offset");
+		argv_array_push(&cmd.args,  "--delta-base-offset");
 
-	argv_array_push(&cmd_args, packtmp);
+	argv_array_push(&cmd.args, packtmp);
 
-	cmd.argv = cmd_args.argv;
 	cmd.git_cmd = 1;
 	cmd.out = -1;
 	cmd.no_stdin = 1;
@@ -270,7 +268,6 @@ int cmd_repack(int argc, const char **argv, const char *prefix)
 	ret = finish_command(&cmd);
 	if (ret)
 		return ret;
-	argv_array_clear(&cmd_args);
 
 	if (!names.nr && !quiet)
 		printf("Nothing new to pack.\n");
diff --git a/wt-status.c b/wt-status.c
index cdbc8d7..b54eac5 100644
--- a/wt-status.c
+++ b/wt-status.c
@@ -726,7 +726,6 @@ static void wt_status_print_changed(struct wt_status *s)
 static void wt_status_print_submodule_summary(struct wt_status *s, int uncommitted)
 {
 	struct child_process sm_summary = CHILD_PROCESS_INIT;
-	struct argv_array argv = ARGV_ARRAY_INIT;
 	struct strbuf cmd_stdout = STRBUF_INIT;
 	struct strbuf summary = STRBUF_INIT;
 	char *summary_content;
@@ -735,23 +734,21 @@ static void wt_status_print_submodule_summary(struct wt_status *s, int uncommitt
 	argv_array_pushf(&sm_summary.env_array, "GIT_INDEX_FILE=%s",
 			 s->index_file);
 
-	argv_array_push(&argv, "submodule");
-	argv_array_push(&argv, "summary");
-	argv_array_push(&argv, uncommitted ? "--files" : "--cached");
-	argv_array_push(&argv, "--for-status");
-	argv_array_push(&argv, "--summary-limit");
-	argv_array_pushf(&argv, "%d", s->submodule_summary);
+	argv_array_push(&sm_summary.args, "submodule");
+	argv_array_push(&sm_summary.args, "summary");
+	argv_array_push(&sm_summary.args, uncommitted ? "--files" : "--cached");
+	argv_array_push(&sm_summary.args, "--for-status");
+	argv_array_push(&sm_summary.args, "--summary-limit");
+	argv_array_pushf(&sm_summary.args, "%d", s->submodule_summary);
 	if (!uncommitted)
-		argv_array_push(&argv, s->amend ? "HEAD^" : "HEAD");
+		argv_array_push(&sm_summary.args, s->amend ? "HEAD^" : "HEAD");
 
-	sm_summary.argv = argv.argv;
 	sm_summary.git_cmd = 1;
 	sm_summary.no_stdin = 1;
 	fflush(s->fp);
 	sm_summary.out = -1;
 
 	run_command(&sm_summary);
-	argv_array_clear(&argv);
 
 	len = strbuf_read(&cmd_stdout, sm_summary.out, 1024);
 
-- 
2.1.3