repack: move pack_kept_objects to struct pack_objects_args

The "pack_kept_objects" variable is defined as static to the repack
builtin, but is inherently related to the pack-objects arguments that
the builtin uses when generating new packs.

Move that field into the "struct pack_objects_args", and shuffle around
where we append the corresponding command-line option when preparing a
pack-objects process. Specifically:

 - `write_cruft_pack()` always wants to pass "--honor-pack-keep", so
   explicitly set the `pack_kept_objects` field to "0" when initializing
   the `write_pack_opts` struct before calling `write_cruft_pack()`.

 - `write_filtered_pack()` no longer needs to handle writing the
   command-line option "--honor-pack-keep" when preparing a pack-objects
   process, since its call to `prepare_pack_objects()` will have already
   taken care of that.

   `write_filtered_pack()` also reads the `pack_kept_objects` field to
   determine whether to write the existing kept packs with a leading "^"
   character, so update that to read through the `po_args` pointer
   instead.

 - `cmd_repack()` also no longer has to write the "--honor-pack-keep"
   flag explicitly, since this is also handled via its call to
   `prepare_pack_objects()`.

Since there is a default value for "pack_kept_objects" that relies on
whether or not we are writing a bitmap (and not writing a MIDX), extract
a default initializer for `struct pack_objects_args` that keeps this
conditional default behavior.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/repack.c

@@ -33,7 +33,6 @@
 #define RETAIN_PACK 2
 
 static int pack_everything;
-static int pack_kept_objects = -1;
 static int write_bitmaps = -1;
 static int use_delta_islands;
 static int run_update_server_info = 1;
@@ -68,7 +67,7 @@ static int repack_config(const char *var, const char *value,
 		return 0;
 	}
 	if (!strcmp(var, "repack.packkeptobjects")) {
-		pack_kept_objects = git_config_bool(var, value);
+		po_args->pack_kept_objects = git_config_bool(var, value);
 		return 0;
 	}
 	if (!strcmp(var, "repack.writebitmaps") ||
@@ -122,8 +121,6 @@ static int write_filtered_pack(const struct write_pack_opts *opts,
 
 	strvec_push(&cmd.args, "--stdin-packs");
 
-	if (!pack_kept_objects)
-		strvec_push(&cmd.args, "--honor-pack-keep");
 	for_each_string_list_item(item, &existing->kept_packs)
 		strvec_pushf(&cmd.args, "--keep-pack=%s", item->string);
 
@@ -146,7 +143,7 @@ static int write_filtered_pack(const struct write_pack_opts *opts,
 		fprintf(in, "%s.pack\n", item->string);
 	for_each_string_list_item(item, &existing->cruft_packs)
 		fprintf(in, "%s.pack\n", item->string);
-	caret = pack_kept_objects ? "" : "^";
+	caret = opts->po_args->pack_kept_objects ? "" : "^";
 	for_each_string_list_item(item, &existing->kept_packs)
 		fprintf(in, "%s%s.pack\n", caret, item->string);
 	fclose(in);
@@ -208,7 +205,6 @@ static int write_cruft_pack(const struct write_pack_opts *opts,
 		strvec_pushf(&cmd.args, "--cruft-expiration=%s",
 			     cruft_expiration);
 
-	strvec_push(&cmd.args, "--honor-pack-keep");
 	strvec_push(&cmd.args, "--non-empty");
 
 	cmd.in = -1;
@@ -332,7 +328,7 @@ int cmd_repack(int argc,
 		OPT_UNSIGNED(0, "max-pack-size", &po_args.max_pack_size,
 			     N_("maximum size of each packfile")),
 		OPT_PARSE_LIST_OBJECTS_FILTER(&po_args.filter_options),
-		OPT_BOOL(0, "pack-kept-objects", &pack_kept_objects,
+		OPT_BOOL(0, "pack-kept-objects", &po_args.pack_kept_objects,
 				N_("repack objects in packs marked with .keep")),
 		OPT_STRING_LIST(0, "keep-pack", &keep_pack_list, N_("name"),
 				N_("do not repack this pack")),
@@ -378,8 +374,8 @@ int cmd_repack(int argc,
 		    (!(pack_everything & ALL_INTO_ONE) || !is_bare_repository()))
 			write_bitmaps = 0;
 	}
-	if (pack_kept_objects < 0)
+	if (po_args.pack_kept_objects < 0)
-		pack_kept_objects = write_bitmaps > 0 && !write_midx;
+		po_args.pack_kept_objects = write_bitmaps > 0 && !write_midx;
 
 	if (write_bitmaps && !(pack_everything & ALL_INTO_ONE) && !write_midx)
 		die(_(incremental_bitmap_conflict_error));
@@ -420,8 +416,7 @@ int cmd_repack(int argc,
 	if (geometry.split_factor) {
 		if (pack_everything)
 			die(_("options '%s' and '%s' cannot be used together"), "--geometric", "-A/-a");
-		pack_geometry_init(&geometry, &existing, &po_args,
+		pack_geometry_init(&geometry, &existing, &po_args);
-				   pack_kept_objects);
 		pack_geometry_split(&geometry);
 	}
 
@@ -430,8 +425,6 @@ int cmd_repack(int argc,
 	show_progress = !po_args.quiet && isatty(2);
 
 	strvec_push(&cmd.args, "--keep-true-parents");
-	if (!pack_kept_objects)
-		strvec_push(&cmd.args, "--honor-pack-keep");
 	for (i = 0; i < keep_pack_list.nr; i++)
 		strvec_pushf(&cmd.args, "--keep-pack=%s",
 			     keep_pack_list.items[i].string);
@@ -581,6 +574,7 @@ int cmd_repack(int argc,
 		cruft_po_args.local = po_args.local;
 		cruft_po_args.quiet = po_args.quiet;
 		cruft_po_args.delta_base_offset = po_args.delta_base_offset;
+		cruft_po_args.pack_kept_objects = 0;
 
 		ret = write_cruft_pack(&opts, cruft_expiration,
 				       combine_cruft_below_size, &names,

repack-geometry.c

@@ -27,8 +27,7 @@ static int pack_geometry_cmp(const void *va, const void *vb)
 
 void pack_geometry_init(struct pack_geometry *geometry,
 			struct existing_packs *existing,
-			const struct pack_objects_args *args,
+			const struct pack_objects_args *args)
-			int pack_kept_objects)
 {
 	struct packfile_store *packs = existing->repo->objects->packfiles;
 	struct packed_git *p;
@@ -43,7 +42,7 @@ void pack_geometry_init(struct pack_geometry *geometry,
 			 */
 			continue;
 
-		if (!pack_kept_objects) {
+		if (!args->pack_kept_objects) {
 			/*
 			 * Any pack that has its pack_keep bit set will
 			 * appear in existing->kept_packs below, but

repack.c

@@ -38,6 +38,8 @@ void prepare_pack_objects(struct child_process *cmd,
 		strvec_push(&cmd->args,  "--quiet");
 	if (args->delta_base_offset)
 		strvec_push(&cmd->args,  "--delta-base-offset");
+	if (!args->pack_kept_objects)
+		strvec_push(&cmd->args,  "--honor-pack-keep");
 	strvec_push(&cmd->args, out);
 	cmd->git_cmd = 1;
 	cmd->out = -1;

repack.h

@@ -17,10 +17,14 @@ struct pack_objects_args {
 	int name_hash_version;
 	int path_walk;
 	int delta_base_offset;
+	int pack_kept_objects;
 	struct list_objects_filter_options filter_options;
 };
 
-#define PACK_OBJECTS_ARGS_INIT { .delta_base_offset = 1 }
+#define PACK_OBJECTS_ARGS_INIT { \
+	.delta_base_offset = 1, \
+	.pack_kept_objects = -1, \
+}
 
 struct child_process;
 
@@ -104,8 +108,7 @@ struct pack_geometry {
 
 void pack_geometry_init(struct pack_geometry *geometry,
 			struct existing_packs *existing,
-			const struct pack_objects_args *args,
+			const struct pack_objects_args *args);
-			int pack_kept_objects);
 void pack_geometry_split(struct pack_geometry *geometry);
 struct packed_git *pack_geometry_preferred_pack(struct pack_geometry *geometry);
 void pack_geometry_remove_redundant(struct pack_geometry *geometry,