commit-graph: stop passing in redundant repository

Many of the commit-graph related functions take in both a repository and
the object database source (directly or via `struct commit_graph`) for
which we are supposed to load such a commit-graph. In the best case this
information is simply redundant as the source already contains a
reference to its owning object database, which in turn has a reference
to its repository. In the worst case this information could even
mismatch when passing in a source that doesn't belong to the same
repository.

Refactor the code so that we only pass in the object database source in
those cases.

There is one exception though, namely `load_commit_graph_chain_fd_st()`,
which is responsible for loading a commit-graph chain. It is expected
that parts of the commit-graph chain aren't located in the same object
source as the chain file itself, but in a different one. Consequently,
this function doesn't work on the source level but on the database level
instead.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: pks-t

builtin/commit-graph.c

@@ -122,15 +122,15 @@ static int graph_verify(int argc, const char **argv, const char *prefix,
 	if (opened == OPENED_NONE)
 		return 0;
 	else if (opened == OPENED_GRAPH)
-		graph = load_commit_graph_one_fd_st(the_repository, fd, &st, source);
+		graph = load_commit_graph_one_fd_st(source, fd, &st);
 	else
-		graph = load_commit_graph_chain_fd_st(the_repository, fd, &st,
+		graph = load_commit_graph_chain_fd_st(the_repository->objects, fd, &st,
 						      &incomplete_chain);
 
 	if (!graph)
 		return 1;
 
-	ret = verify_commit_graph(the_repository, graph, flags);
+	ret = verify_commit_graph(graph, flags);
 	free_commit_graph(graph);
 
 	if (incomplete_chain) {

commit-graph.c

@@ -253,25 +253,24 @@ int open_commit_graph(const char *graph_file, int *fd, struct stat *st)
 	return 1;
 }
 
-struct commit_graph *load_commit_graph_one_fd_st(struct repository *r,
-						 int fd, struct stat *st,
-						 struct odb_source *source)
+struct commit_graph *load_commit_graph_one_fd_st(struct odb_source *source,
+						 int fd, struct stat *st)
 {
 	void *graph_map;
 	size_t graph_size;
 	struct commit_graph *ret;
 
 	graph_size = xsize_t(st->st_size);
 
-	if (graph_size < graph_min_size(r->hash_algo)) {
+	if (graph_size < graph_min_size(source->odb->repo->hash_algo)) {
 		close(fd);
 		error(_("commit-graph file is too small"));
 		return NULL;
 	}
 	graph_map = xmmap(NULL, graph_size, PROT_READ, MAP_PRIVATE, fd, 0);
 	close(fd);
 
-	ret = parse_commit_graph(r, graph_map, graph_size);
+	ret = parse_commit_graph(source->odb->repo, graph_map, graph_size);
 	if (ret)
 		ret->odb_source = source;
 	else
@@ -491,11 +490,9 @@ struct commit_graph *parse_commit_graph(struct repository *r,
 	return NULL;
 }
 
-static struct commit_graph *load_commit_graph_one(struct repository *r,
-						  const char *graph_file,
-						  struct odb_source *source)
+static struct commit_graph *load_commit_graph_one(struct odb_source *source,
+						  const char *graph_file)
 {
-
 	struct stat st;
 	int fd;
 	struct commit_graph *g;
@@ -504,19 +501,17 @@ static struct commit_graph *load_commit_graph_one(struct repository *r,
 	if (!open_ok)
 		return NULL;
 
-	g = load_commit_graph_one_fd_st(r, fd, &st, source);
-
+	g = load_commit_graph_one_fd_st(source, fd, &st);
 	if (g)
 		g->filename = xstrdup(graph_file);
 
 	return g;
 }
 
-static struct commit_graph *load_commit_graph_v1(struct repository *r,
-						 struct odb_source *source)
+static struct commit_graph *load_commit_graph_v1(struct odb_source *source)
 {
 	char *graph_name = get_commit_graph_filename(source);
-	struct commit_graph *g = load_commit_graph_one(r, graph_name, source);
+	struct commit_graph *g = load_commit_graph_one(source, graph_name);
 	free(graph_name);
 
 	return g;
@@ -643,7 +638,7 @@ int open_commit_graph_chain(const char *chain_file,
 	return 1;
 }
 
-struct commit_graph *load_commit_graph_chain_fd_st(struct repository *r,
+struct commit_graph *load_commit_graph_chain_fd_st(struct object_database *odb,
 						   int fd, struct stat *st,
 						   int *incomplete_chain)
 {
@@ -653,28 +648,28 @@ struct commit_graph *load_commit_graph_chain_fd_st(struct repository *r,
 	int i = 0, valid = 1, count;
 	FILE *fp = xfdopen(fd, "r");
 
-	count = st->st_size / (r->hash_algo->hexsz + 1);
+	count = st->st_size / (odb->repo->hash_algo->hexsz + 1);
 	CALLOC_ARRAY(oids, count);
 
-	odb_prepare_alternates(r->objects);
+	odb_prepare_alternates(odb);
 
 	for (i = 0; i < count; i++) {
 		struct odb_source *source;
 
 		if (strbuf_getline_lf(&line, fp) == EOF)
 			break;
 
-		if (get_oid_hex_algop(line.buf, &oids[i], r->hash_algo)) {
+		if (get_oid_hex_algop(line.buf, &oids[i], odb->repo->hash_algo)) {
 			warning(_("invalid commit-graph chain: line '%s' not a hash"),
 				line.buf);
 			valid = 0;
 			break;
 		}
 
 		valid = 0;
-		for (source = r->objects->sources; source; source = source->next) {
+		for (source = odb->sources; source; source = source->next) {
 			char *graph_name = get_split_graph_filename(source, line.buf);
-			struct commit_graph *g = load_commit_graph_one(r, graph_name, source);
+			struct commit_graph *g = load_commit_graph_one(source, graph_name);
 
 			free(graph_name);
 
@@ -707,45 +702,33 @@ struct commit_graph *load_commit_graph_chain_fd_st(struct repository *r,
 	return graph_chain;
 }
 
-static struct commit_graph *load_commit_graph_chain(struct repository *r,
-						    struct odb_source *source)
+static struct commit_graph *load_commit_graph_chain(struct odb_source *source)
 {
 	char *chain_file = get_commit_graph_chain_filename(source);
 	struct stat st;
 	int fd;
 	struct commit_graph *g = NULL;
 
-	if (open_commit_graph_chain(chain_file, &fd, &st, r->hash_algo)) {
+	if (open_commit_graph_chain(chain_file, &fd, &st, source->odb->repo->hash_algo)) {
 		int incomplete;
 		/* ownership of fd is taken over by load function */
-		g = load_commit_graph_chain_fd_st(r, fd, &st, &incomplete);
+		g = load_commit_graph_chain_fd_st(source->odb, fd, &st, &incomplete);
 	}
 
 	free(chain_file);
 	return g;
 }
 
-struct commit_graph *read_commit_graph_one(struct repository *r,
-					   struct odb_source *source)
+struct commit_graph *read_commit_graph_one(struct odb_source *source)
 {
-	struct commit_graph *g = load_commit_graph_v1(r, source);
+	struct commit_graph *g = load_commit_graph_v1(source);
 
 	if (!g)
-		g = load_commit_graph_chain(r, source);
+		g = load_commit_graph_chain(source);
 
 	return g;
 }
 
-static void prepare_commit_graph_one(struct repository *r,
-				     struct odb_source *source)
-{
-
-	if (r->objects->commit_graph)
-		return;
-
-	r->objects->commit_graph = read_commit_graph_one(r, source);
-}
-
 /*
  * Return 1 if commit_graph is non-NULL, and 0 otherwise.
  *
@@ -786,10 +769,12 @@ static int prepare_commit_graph(struct repository *r)
 		return 0;
 
 	odb_prepare_alternates(r->objects);
-	for (source = r->objects->sources;
-	     !r->objects->commit_graph && source;
-	     source = source->next)
-		prepare_commit_graph_one(r, source);
+	for (source = r->objects->sources; source; source = source->next) {
+		r->objects->commit_graph = read_commit_graph_one(source);
+		if (r->objects->commit_graph)
+			break;
+	}
+
 	return !!r->objects->commit_graph;
 }
 
@@ -874,8 +859,7 @@ static void load_oid_from_graph(struct commit_graph *g,
 		g->hash_algo);
 }
 
-static struct commit_list **insert_parent_or_die(struct repository *r,
-						 struct commit_graph *g,
+static struct commit_list **insert_parent_or_die(struct commit_graph *g,
 						 uint32_t pos,
 						 struct commit_list **pptr)
 {
@@ -886,7 +870,7 @@ static struct commit_list **insert_parent_or_die(struct repository *r,
 		die("invalid parent position %"PRIu32, pos);
 
 	load_oid_from_graph(g, pos, &oid);
-	c = lookup_commit(r, &oid);
+	c = lookup_commit(g->odb_source->odb->repo, &oid);
 	if (!c)
 		die(_("could not find commit %s"), oid_to_hex(&oid));
 	commit_graph_data_at(c)->graph_pos = pos;
@@ -942,8 +926,7 @@ static inline void set_commit_tree(struct commit *c, struct tree *t)
 	c->maybe_tree = t;
 }
 
-static int fill_commit_in_graph(struct repository *r,
-				struct commit *item,
+static int fill_commit_in_graph(struct commit *item,
 				struct commit_graph *g, uint32_t pos)
 {
 	uint32_t edge_value;
@@ -969,13 +952,13 @@ static int fill_commit_in_graph(struct repository *r,
 	edge_value = get_be32(commit_data + g->hash_algo->rawsz);
 	if (edge_value == GRAPH_PARENT_NONE)
 		return 1;
-	pptr = insert_parent_or_die(r, g, edge_value, pptr);
+	pptr = insert_parent_or_die(g, edge_value, pptr);
 
 	edge_value = get_be32(commit_data + g->hash_algo->rawsz + 4);
 	if (edge_value == GRAPH_PARENT_NONE)
 		return 1;
 	if (!(edge_value & GRAPH_EXTRA_EDGES_NEEDED)) {
-		pptr = insert_parent_or_die(r, g, edge_value, pptr);
+		pptr = insert_parent_or_die(g, edge_value, pptr);
 		return 1;
 	}
 
@@ -990,7 +973,7 @@ static int fill_commit_in_graph(struct repository *r,
 		}
 		edge_value = get_be32(g->chunk_extra_edges +
 				      sizeof(uint32_t) * parent_data_pos);
-		pptr = insert_parent_or_die(r, g,
+		pptr = insert_parent_or_die(g,
 					    edge_value & GRAPH_EDGE_LAST_MASK,
 					    pptr);
 		parent_data_pos++;
@@ -1056,14 +1039,13 @@ struct commit *lookup_commit_in_graph(struct repository *repo, const struct obje
 	if (commit->object.parsed)
 		return commit;
 
-	if (!fill_commit_in_graph(repo, commit, repo->objects->commit_graph, pos))
+	if (!fill_commit_in_graph(commit, repo->objects->commit_graph, pos))
 		return NULL;
 
 	return commit;
 }
 
-static int parse_commit_in_graph_one(struct repository *r,
-				     struct commit_graph *g,
+static int parse_commit_in_graph_one(struct commit_graph *g,
 				     struct commit *item)
 {
 	uint32_t pos;
@@ -1072,7 +1054,7 @@ static int parse_commit_in_graph_one(struct repository *r,
 		return 1;
 
 	if (find_commit_pos_in_graph(item, g, &pos))
-		return fill_commit_in_graph(r, item, g, pos);
+		return fill_commit_in_graph(item, g, pos);
 
 	return 0;
 }
@@ -1089,7 +1071,7 @@ int parse_commit_in_graph(struct repository *r, struct commit *item)
 
 	if (!prepare_commit_graph(r))
 		return 0;
-	return parse_commit_in_graph_one(r, r->objects->commit_graph, item);
+	return parse_commit_in_graph_one(r->objects->commit_graph, item);
 }
 
 void load_commit_graph_info(struct repository *r, struct commit *item)
@@ -1099,8 +1081,7 @@ void load_commit_graph_info(struct repository *r, struct commit *item)
 		fill_commit_graph_info(item, r->objects->commit_graph, pos);
 }
 
-static struct tree *load_tree_for_commit(struct repository *r,
-					 struct commit_graph *g,
+static struct tree *load_tree_for_commit(struct commit_graph *g,
 					 struct commit *c)
 {
 	struct object_id oid;
@@ -1115,26 +1096,25 @@ static struct tree *load_tree_for_commit(struct repository *r,
 				graph_pos - g->num_commits_in_base);
 
 	oidread(&oid, commit_data, g->hash_algo);
-	set_commit_tree(c, lookup_tree(r, &oid));
+	set_commit_tree(c, lookup_tree(g->odb_source->odb->repo, &oid));
 
 	return c->maybe_tree;
 }
 
-static struct tree *get_commit_tree_in_graph_one(struct repository *r,
-						 struct commit_graph *g,
+static struct tree *get_commit_tree_in_graph_one(struct commit_graph *g,
 						 const struct commit *c)
 {
 	if (c->maybe_tree)
 		return c->maybe_tree;
 	if (commit_graph_position(c) == COMMIT_NOT_FROM_GRAPH)
 		BUG("get_commit_tree_in_graph_one called from non-commit-graph commit");
 
-	return load_tree_for_commit(r, g, (struct commit *)c);
+	return load_tree_for_commit(g, (struct commit *)c);
 }
 
 struct tree *get_commit_tree_in_graph(struct repository *r, const struct commit *c)
 {
-	return get_commit_tree_in_graph_one(r, r->objects->commit_graph, c);
+	return get_commit_tree_in_graph_one(r->objects->commit_graph, c);
 }
 
 struct packed_commit_list {
@@ -2741,11 +2721,11 @@ static int commit_graph_checksum_valid(struct commit_graph *g)
 				       g->data, g->data_len);
 }
 
-static int verify_one_commit_graph(struct repository *r,
-				   struct commit_graph *g,
+static int verify_one_commit_graph(struct commit_graph *g,
 				   struct progress *progress,
 				   uint64_t *seen)
 {
+	struct repository *r = g->odb_source->odb->repo;
 	uint32_t i, cur_fanout_pos = 0;
 	struct object_id prev_oid, cur_oid;
 	struct commit *seen_gen_zero = NULL;
@@ -2779,7 +2759,7 @@ static int verify_one_commit_graph(struct repository *r,
 		}
 
 		graph_commit = lookup_commit(r, &cur_oid);
-		if (!parse_commit_in_graph_one(r, g, graph_commit))
+		if (!parse_commit_in_graph_one(g, graph_commit))
 			graph_report(_("failed to parse commit %s from commit-graph"),
 				     oid_to_hex(&cur_oid));
 	}
@@ -2815,7 +2795,7 @@ static int verify_one_commit_graph(struct repository *r,
 			continue;
 		}
 
-		if (!oideq(&get_commit_tree_in_graph_one(r, g, graph_commit)->object.oid,
+		if (!oideq(&get_commit_tree_in_graph_one(g, graph_commit)->object.oid,
 			   get_commit_tree_oid(odb_commit)))
 			graph_report(_("root tree OID for commit %s in commit-graph is %s != %s"),
 				     oid_to_hex(&cur_oid),
@@ -2833,7 +2813,7 @@ static int verify_one_commit_graph(struct repository *r,
 			}
 
 			/* parse parent in case it is in a base graph */
-			parse_commit_in_graph_one(r, g, graph_parents->item);
+			parse_commit_in_graph_one(g, graph_parents->item);
 
 			if (!oideq(&graph_parents->item->object.oid, &odb_parents->item->object.oid))
 				graph_report(_("commit-graph parent for %s is %s != %s"),
@@ -2893,7 +2873,7 @@ static int verify_one_commit_graph(struct repository *r,
 	return verify_commit_graph_error;
 }
 
-int verify_commit_graph(struct repository *r, struct commit_graph *g, int flags)
+int verify_commit_graph(struct commit_graph *g, int flags)
 {
 	struct progress *progress = NULL;
 	int local_error = 0;
@@ -2909,13 +2889,13 @@ int verify_commit_graph(struct repository *r, struct commit_graph *g, int flags)
 		if (!(flags & COMMIT_GRAPH_VERIFY_SHALLOW))
 			total += g->num_commits_in_base;
 
-		progress = start_progress(r,
+		progress = start_progress(g->odb_source->odb->repo,
 					  _("Verifying commits in commit graph"),
 					  total);
 	}
 
 	for (; g; g = g->base_graph) {
-		local_error |= verify_one_commit_graph(r, g, progress, &seen);
+		local_error |= verify_one_commit_graph(g, progress, &seen);
 		if (flags & COMMIT_GRAPH_VERIFY_SHALLOW)
 			break;
 	}