packfile: add repository to struct packed_git

The struct `packed_git` holds information regarding a packed object
file. Let's add the repository variable to this object, to represent the
repository that this packfile belongs to. This helps remove dependency
on the global `the_repository` object in `packfile.c` by simply using
repository information now readily available in the struct.

We do need to consider that a packfile could be part of the alternates
of a repository, but considering that we only have one repository struct
and also that we currently anyways use 'the_repository', we should be
OK with this change.

We also modify `alloc_packed_git` to ensure that the repository is added
to newly created `packed_git` structs. This requires modifying the
function and all its callee to pass the repository object down the
levels.

Helped-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Karthik Nayak <karthik.188@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/fast-import.c

@@ -765,6 +765,7 @@ static void start_packfile(void)
 
 	p->pack_fd = pack_fd;
 	p->do_not_close = 1;
+	p->repo = the_repository;
 	pack_file = hashfd(pack_fd, p->pack_name);
 
 	pack_data = p;
@@ -888,7 +889,7 @@ static void end_packfile(void)
 		idx_name = keep_pack(create_index());
 
 		/* Register the packfile with core git's machinery. */
-		new_p = add_packed_git(idx_name, strlen(idx_name), 1);
+		new_p = add_packed_git(pack_data->repo, idx_name, strlen(idx_name), 1);
 		if (!new_p)
 			die("core git rejected index %s", idx_name);
 		all_packs[pack_id] = new_p;

builtin/index-pack.c

@@ -1552,7 +1552,8 @@ static void final(const char *final_pack_name, const char *curr_pack_name,
 
 	if (do_fsck_object) {
 		struct packed_git *p;
-		p = add_packed_git(final_index_name, strlen(final_index_name), 0);
+		p = add_packed_git(the_repository, final_index_name,
+				   strlen(final_index_name), 0);
 		if (p)
 			install_packed_git(the_repository, p);
 	}
@@ -1650,7 +1651,8 @@ static void read_v2_anomalous_offsets(struct packed_git *p,
 
 static void read_idx_option(struct pack_idx_option *opts, const char *pack_name)
 {
-	struct packed_git *p = add_packed_git(pack_name, strlen(pack_name), 1);
+	struct packed_git *p = add_packed_git(the_repository, pack_name,
+					      strlen(pack_name), 1);
 
 	if (!p)
 		die(_("Cannot open existing pack file '%s'"), pack_name);

commit-graph.c

@@ -1914,7 +1914,7 @@ static int fill_oids_from_packs(struct write_commit_graph_context *ctx,
 		struct packed_git *p;
 		strbuf_setlen(&packname, dirlen);
 		strbuf_addstr(&packname, pack_indexes->items[i].string);
-		p = add_packed_git(packname.buf, packname.len, 1);
+		p = add_packed_git(ctx->r, packname.buf, packname.len, 1);
 		if (!p) {
 			ret = error(_("error adding pack %s"), packname.buf);
 			goto cleanup;

connected.c

@@ -54,7 +54,8 @@ int check_connected(oid_iterate_fn fn, void *cb_data,
 		strbuf_add(&idx_file, transport->pack_lockfiles.items[0].string,
 			   base_len);
 		strbuf_addstr(&idx_file, ".idx");
-		new_pack = add_packed_git(idx_file.buf, idx_file.len, 1);
+		new_pack = add_packed_git(the_repository, idx_file.buf,
+					  idx_file.len, 1);
 		strbuf_release(&idx_file);
 	}
 

http.c

@@ -2439,7 +2439,7 @@ static int fetch_and_setup_pack_index(struct packed_git **packs_head,
 	if (!tmp_idx)
 		return -1;
 
-	new_pack = parse_pack_index(sha1, tmp_idx);
+	new_pack = parse_pack_index(the_repository, sha1, tmp_idx);
 	if (!new_pack) {
 		unlink(tmp_idx);
 		free(tmp_idx);

midx-write.c

@@ -154,7 +154,7 @@ static void add_pack_to_midx(const char *full_path, size_t full_path_len,
 			return;
 
 		ALLOC_GROW(ctx->info, ctx->nr + 1, ctx->alloc);
-		p = add_packed_git(full_path, full_path_len, 0);
+		p = add_packed_git(the_repository, full_path, full_path_len, 0);
 		if (!p) {
 			warning(_("failed to add packfile '%s'"),
 				full_path);

midx.c

@@ -464,7 +464,7 @@ int prepare_midx_pack(struct repository *r, struct multi_pack_index *m,
 					strhash(key.buf), key.buf,
 					struct packed_git, packmap_ent);
 	if (!p) {
-		p = add_packed_git(pack_name.buf, pack_name.len, m->local);
+		p = add_packed_git(r, pack_name.buf, pack_name.len, m->local);
 		if (p) {
 			install_packed_git(r, p);
 			list_add_tail(&p->mru, &r->objects->packed_git_mru);

object-store-ll.h

@@ -10,6 +10,7 @@
 struct oidmap;
 struct oidtree;
 struct strbuf;
+struct repository;
 
 struct object_directory {
 	struct object_directory *next;
@@ -135,6 +136,10 @@ struct packed_git {
 	 */
 	const uint32_t *mtimes_map;
 	size_t mtimes_size;
+
+	/* repo denotes the repository this packfile belongs to */
+	struct repository *repo;
+
 	/* something like ".git/objects/pack/xxxxx.pack" */
 	char pack_name[FLEX_ARRAY]; /* more */
 };

packfile.c

@@ -217,11 +217,12 @@ uint32_t get_pack_fanout(struct packed_git *p, uint32_t value)
 	return ntohl(level1_ofs[value]);
 }
 
-static struct packed_git *alloc_packed_git(int extra)
+static struct packed_git *alloc_packed_git(struct repository *r, int extra)
 {
 	struct packed_git *p = xmalloc(st_add(sizeof(*p), extra));
 	memset(p, 0, sizeof(*p));
 	p->pack_fd = -1;
+	p->repo = r;
 	return p;
 }
 
@@ -233,11 +234,12 @@ static char *pack_path_from_idx(const char *idx_path)
 	return xstrfmt("%.*s.pack", (int)len, idx_path);
 }
 
-struct packed_git *parse_pack_index(unsigned char *sha1, const char *idx_path)
+struct packed_git *parse_pack_index(struct repository *r, unsigned char *sha1,
+				    const char *idx_path)
 {
 	char *path = pack_path_from_idx(idx_path);
 	size_t alloc = st_add(strlen(path), 1);
-	struct packed_git *p = alloc_packed_git(alloc);
+	struct packed_git *p = alloc_packed_git(r, alloc);
 
 	memcpy(p->pack_name, path, alloc); /* includes NUL */
 	free(path);
@@ -703,7 +705,8 @@ void unuse_pack(struct pack_window **w_cursor)
 	}
 }
 
-struct packed_git *add_packed_git(const char *path, size_t path_len, int local)
+struct packed_git *add_packed_git(struct repository *r, const char *path,
+				  size_t path_len, int local)
 {
 	struct stat st;
 	size_t alloc;
@@ -721,7 +724,7 @@ struct packed_git *add_packed_git(const char *path, size_t path_len, int local)
 	 * the use xsnprintf double-checks that)
 	 */
 	alloc = st_add3(path_len, strlen(".promisor"), 1);
-	p = alloc_packed_git(alloc);
+	p = alloc_packed_git(r, alloc);
 	memcpy(p->pack_name, path, path_len);
 
 	xsnprintf(p->pack_name + path_len, alloc - path_len, ".keep");
@@ -877,7 +880,7 @@ static void prepare_pack(const char *full_name, size_t full_name_len,
 
 		/* Don't reopen a pack we already have. */
 		if (!hashmap_get(&data->r->objects->pack_map, &hent, pack_name)) {
-			p = add_packed_git(full_name, full_name_len, data->local);
+			p = add_packed_git(data->r, full_name, full_name_len, data->local);
 			if (p)
 				install_packed_git(data->r, p);
 		}

packfile.h

@@ -46,7 +46,8 @@ const char *pack_basename(struct packed_git *p);
  * and does not add the resulting packed_git struct to the internal list of
  * packs. You probably want add_packed_git() instead.
  */
-struct packed_git *parse_pack_index(unsigned char *sha1, const char *idx_path);
+struct packed_git *parse_pack_index(struct repository *r, unsigned char *sha1,
+				    const char *idx_path);
 
 typedef void each_file_in_pack_dir_fn(const char *full_path, size_t full_path_len,
 				      const char *file_name, void *data);
@@ -113,7 +114,8 @@ void close_pack(struct packed_git *);
 void close_object_store(struct raw_object_store *o);
 void unuse_pack(struct pack_window **);
 void clear_delta_base_cache(void);
-struct packed_git *add_packed_git(const char *path, size_t path_len, int local);
+struct packed_git *add_packed_git(struct repository *r, const char *path,
+				  size_t path_len, int local);
 
 /*
  * Unlink the .pack and associated extension files.