1 files changed, 410 insertions, 98 deletions

diff --git a/commit-graph.c b/commit-graph.c
index 4c6127088f..7cfa779dcb 100644
--- a/commit-graph.c
+++ b/commit-graph.c
@@ -1,15 +1,20 @@
 #include "cache.h"
 #include "config.h"
+#include "dir.h"
 #include "git-compat-util.h"
 #include "lockfile.h"
 #include "pack.h"
 #include "packfile.h"
 #include "commit.h"
 #include "object.h"
+#include "refs.h"
 #include "revision.h"
 #include "sha1-lookup.h"
 #include "commit-graph.h"
 #include "object-store.h"
+#include "alloc.h"
+#include "hashmap.h"
+#include "replace-object.h"
 
 #define GRAPH_SIGNATURE 0x43475048 /* "CGPH" */
 #define GRAPH_CHUNKID_OIDFANOUT 0x4f494446 /* "OIDF" */
@@ -34,10 +39,11 @@
 
 #define GRAPH_LAST_EDGE 0x80000000
 
+#define GRAPH_HEADER_SIZE 8
 #define GRAPH_FANOUT_SIZE (4 * 256)
 #define GRAPH_CHUNKLOOKUP_WIDTH 12
-#define GRAPH_MIN_SIZE (5 * GRAPH_CHUNKLOOKUP_WIDTH + GRAPH_FANOUT_SIZE + \
-			GRAPH_OID_LEN + 8)
+#define GRAPH_MIN_SIZE (GRAPH_HEADER_SIZE + 4 * GRAPH_CHUNKLOOKUP_WIDTH \
+			+ GRAPH_FANOUT_SIZE + GRAPH_OID_LEN)
 
 char *get_commit_graph_filename(const char *obj_dir)
 {
@@ -52,6 +58,28 @@ static struct commit_graph *alloc_commit_graph(void)
 	return g;
 }
 
+extern int read_replace_refs;
+
+static int commit_graph_compatible(struct repository *r)
+{
+	if (!r->gitdir)
+		return 0;
+
+	if (read_replace_refs) {
+		prepare_replace_object(r);
+		if (hashmap_get_size(&r->objects->replace_map->map))
+			return 0;
+	}
+
+	prepare_commit_graft(r);
+	if (r->parsed_objects && r->parsed_objects->grafts_nr)
+		return 0;
+	if (is_repository_shallow(r))
+		return 0;
+
+	return 1;
+}
+
 struct commit_graph *load_commit_graph_one(const char *graph_file)
 {
 	void *graph_map;
@@ -76,28 +104,28 @@ struct commit_graph *load_commit_graph_one(const char *graph_file)
 
 	if (graph_size < GRAPH_MIN_SIZE) {
 		close(fd);
-		die("graph file %s is too small", graph_file);
+		die(_("graph file %s is too small"), graph_file);
 	}
 	graph_map = xmmap(NULL, graph_size, PROT_READ, MAP_PRIVATE, fd, 0);
 	data = (const unsigned char *)graph_map;
 
 	graph_signature = get_be32(data);
 	if (graph_signature != GRAPH_SIGNATURE) {
-		error("graph signature %X does not match signature %X",
+		error(_("graph signature %X does not match signature %X"),
 		      graph_signature, GRAPH_SIGNATURE);
 		goto cleanup_fail;
 	}
 
 	graph_version = *(unsigned char*)(data + 4);
 	if (graph_version != GRAPH_VERSION) {
-		error("graph version %X does not match version %X",
+		error(_("graph version %X does not match version %X"),
 		      graph_version, GRAPH_VERSION);
 		goto cleanup_fail;
 	}
 
 	hash_version = *(unsigned char*)(data + 5);
 	if (hash_version != GRAPH_OID_VERSION) {
-		error("hash version %X does not match version %X",
+		error(_("hash version %X does not match version %X"),
 		      hash_version, GRAPH_OID_VERSION);
 		goto cleanup_fail;
 	}
@@ -121,7 +149,7 @@ struct commit_graph *load_commit_graph_one(const char *graph_file)
 		chunk_lookup += GRAPH_CHUNKLOOKUP_WIDTH;
 
 		if (chunk_offset > graph_size - GIT_MAX_RAWSZ) {
-			error("improper chunk offset %08x%08x", (uint32_t)(chunk_offset >> 32),
+			error(_("improper chunk offset %08x%08x"), (uint32_t)(chunk_offset >> 32),
 			      (uint32_t)chunk_offset);
 			goto cleanup_fail;
 		}
@@ -157,7 +185,7 @@ struct commit_graph *load_commit_graph_one(const char *graph_file)
 		}
 
 		if (chunk_repeated) {
-			error("chunk id %08x appears multiple times", chunk_id);
+			error(_("chunk id %08x appears multiple times"), chunk_id);
 			goto cleanup_fail;
 		}
 
@@ -179,53 +207,63 @@ cleanup_fail:
 	exit(1);
 }
 
-/* global storage */
-static struct commit_graph *commit_graph = NULL;
-
-static void prepare_commit_graph_one(const char *obj_dir)
+static void prepare_commit_graph_one(struct repository *r, const char *obj_dir)
 {
 	char *graph_name;
 
-	if (commit_graph)
+	if (r->objects->commit_graph)
 		return;
 
 	graph_name = get_commit_graph_filename(obj_dir);
-	commit_graph = load_commit_graph_one(graph_name);
+	r->objects->commit_graph =
+		load_commit_graph_one(graph_name);
 
 	FREE_AND_NULL(graph_name);
 }
 
-static int prepare_commit_graph_run_once = 0;
-static void prepare_commit_graph(void)
+/*
+ * Return 1 if commit_graph is non-NULL, and 0 otherwise.
+ *
+ * On the first invocation, this function attemps to load the commit
+ * graph if the_repository is configured to have one.
+ */
+static int prepare_commit_graph(struct repository *r)
 {
 	struct alternate_object_database *alt;
 	char *obj_dir;
+	int config_value;
+
+	if (r->objects->commit_graph_attempted)
+		return !!r->objects->commit_graph;
+	r->objects->commit_graph_attempted = 1;
+
+	if (repo_config_get_bool(r, "core.commitgraph", &config_value) ||
+	    !config_value)
+		/*
+		 * This repository is not configured to use commit graphs, so
+		 * do not load one. (But report commit_graph_attempted anyway
+		 * so that commit graph loading is not attempted again for this
+		 * repository.)
+		 */
+		return 0;
 
-	if (prepare_commit_graph_run_once)
-		return;
-	prepare_commit_graph_run_once = 1;
+	if (!commit_graph_compatible(r))
+		return 0;
 
-	obj_dir = get_object_directory();
-	prepare_commit_graph_one(obj_dir);
-	prepare_alt_odb(the_repository);
-	for (alt = the_repository->objects->alt_odb_list;
-	     !commit_graph && alt;
+	obj_dir = r->objects->objectdir;
+	prepare_commit_graph_one(r, obj_dir);
+	prepare_alt_odb(r);
+	for (alt = r->objects->alt_odb_list;
+	     !r->objects->commit_graph && alt;
 	     alt = alt->next)
-		prepare_commit_graph_one(alt->path);
+		prepare_commit_graph_one(r, alt->path);
+	return !!r->objects->commit_graph;
 }
 
-static void close_commit_graph(void)
+void close_commit_graph(struct repository *r)
 {
-	if (!commit_graph)
-		return;
-
-	if (commit_graph->graph_fd >= 0) {
-		munmap((void *)commit_graph->data, commit_graph->data_len);
-		commit_graph->data = NULL;
-		close(commit_graph->graph_fd);
-	}
-
-	FREE_AND_NULL(commit_graph);
+	free_commit_graph(r->objects->commit_graph);
+	r->objects->commit_graph = NULL;
 }
 
 static int bsearch_graph(struct commit_graph *g, struct object_id *oid, uint32_t *pos)
@@ -240,14 +278,25 @@ static struct commit_list **insert_parent_or_die(struct commit_graph *g,
 {
 	struct commit *c;
 	struct object_id oid;
+
+	if (pos >= g->num_commits)
+		die("invalid parent position %"PRIu64, pos);
+
 	hashcpy(oid.hash, g->chunk_oid_lookup + g->hash_len * pos);
-	c = lookup_commit(&oid);
+	c = lookup_commit(the_repository, &oid);
 	if (!c)
-		die("could not find commit %s", oid_to_hex(&oid));
+		die(_("could not find commit %s"), oid_to_hex(&oid));
 	c->graph_pos = pos;
 	return &commit_list_insert(c, pptr)->next;
 }
 
+static void fill_commit_graph_info(struct commit *item, struct commit_graph *g, uint32_t pos)
+{
+	const unsigned char *commit_data = g->chunk_commit_data + GRAPH_DATA_WIDTH * pos;
+	item->graph_pos = pos;
+	item->generation = get_be32(commit_data + g->hash_len + 8) >> 2;
+}
+
 static int fill_commit_in_graph(struct commit *item, struct commit_graph *g, uint32_t pos)
 {
 	uint32_t edge_value;
@@ -265,6 +314,8 @@ static int fill_commit_in_graph(struct commit *item, struct commit_graph *g, uin
 	date_low = get_be32(commit_data + g->hash_len + 12);
 	item->date = (timestamp_t)((date_high << 32) | date_low);
 
+	item->generation = get_be32(commit_data + g->hash_len + 8) >> 2;
+
 	pptr = &item->parents;
 
 	edge_value = get_be32(commit_data + g->hash_len);
@@ -293,31 +344,45 @@ static int fill_commit_in_graph(struct commit *item, struct commit_graph *g, uin
 	return 1;
 }
 
-int parse_commit_in_graph(struct commit *item)
+static int find_commit_in_graph(struct commit *item, struct commit_graph *g, uint32_t *pos)
 {
-	if (!core_commit_graph)
-		return 0;
-	if (item->object.parsed)
+	if (item->graph_pos != COMMIT_NOT_FROM_GRAPH) {
+		*pos = item->graph_pos;
 		return 1;
+	} else {
+		return bsearch_graph(g, &(item->object.oid), pos);
+	}
+}
 
-	prepare_commit_graph();
-	if (commit_graph) {
-		uint32_t pos;
-		int found;
-		if (item->graph_pos != COMMIT_NOT_FROM_GRAPH) {
-			pos = item->graph_pos;
-			found = 1;
-		} else {
-			found = bsearch_graph(commit_graph, &(item->object.oid), &pos);
-		}
+static int parse_commit_in_graph_one(struct commit_graph *g, struct commit *item)
+{
+	uint32_t pos;
 
-		if (found)
-			return fill_commit_in_graph(item, commit_graph, pos);
-	}
+	if (item->object.parsed)
+		return 1;
+
+	if (find_commit_in_graph(item, g, &pos))
+		return fill_commit_in_graph(item, g, pos);
 
 	return 0;
 }
 
+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->objects->commit_graph, item);
+}
+
+void load_commit_graph_info(struct repository *r, struct commit *item)
+{
+	uint32_t pos;
+	if (!prepare_commit_graph(r))
+		return;
+	if (find_commit_in_graph(item, r->objects->commit_graph, &pos))
+		fill_commit_graph_info(item, r->objects->commit_graph, pos);
+}
+
 static struct tree *load_tree_for_commit(struct commit_graph *g, struct commit *c)
 {
 	struct object_id oid;
@@ -325,19 +390,25 @@ static struct tree *load_tree_for_commit(struct commit_graph *g, struct commit *
 					   GRAPH_DATA_WIDTH * (c->graph_pos);
 
 	hashcpy(oid.hash, commit_data);
-	c->maybe_tree = lookup_tree(&oid);
+	c->maybe_tree = lookup_tree(the_repository, &oid);
 
 	return c->maybe_tree;
 }
 
-struct tree *get_commit_tree_in_graph(const struct commit *c)
+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 (c->graph_pos == COMMIT_NOT_FROM_GRAPH)
-		BUG("get_commit_tree_in_graph called from non-commit-graph commit");
+		BUG("get_commit_tree_in_graph_one called from non-commit-graph commit");
+
+	return load_tree_for_commit(g, (struct commit *)c);
+}
 
-	return load_tree_for_commit(commit_graph, (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->objects->commit_graph, c);
 }
 
 static void write_graph_chunk_fanout(struct hashfile *f,
@@ -440,6 +511,8 @@ static void write_graph_chunk_data(struct hashfile *f, int hash_len,
 		else
 			packedDate[0] = 0;
 
+		packedDate[0] |= htonl((*list)->generation << 2);
+
 		packedDate[1] = htonl((*list)->date);
 		hashwrite(f, packedDate, 8);
 
@@ -516,7 +589,7 @@ static int add_packed_commits(const struct object_id *oid,
 
 	oi.typep = &type;
 	if (packed_object_info(the_repository, pack, offset, &oi) < 0)
-		die("unable to get type of object %s", oid_to_hex(oid));
+		die(_("unable to get type of object %s"), oid_to_hex(oid));
 
 	if (type != OBJ_COMMIT)
 		return 0;
@@ -547,7 +620,7 @@ static void close_reachable(struct packed_oid_list *oids)
 	struct commit *commit;
 
 	for (i = 0; i < oids->nr; i++) {
-		commit = lookup_commit(&oids->list[i]);
+		commit = lookup_commit(the_repository, &oids->list[i]);
 		if (commit)
 			commit->object.flags |= UNINTERESTING;
 	}
@@ -558,25 +631,81 @@ static void close_reachable(struct packed_oid_list *oids)
 	 * closure.
 	 */
 	for (i = 0; i < oids->nr; i++) {
-		commit = lookup_commit(&oids->list[i]);
+		commit = lookup_commit(the_repository, &oids->list[i]);
 
 		if (commit && !parse_commit(commit))
 			add_missing_parents(oids, commit);
 	}
 
 	for (i = 0; i < oids->nr; i++) {
-		commit = lookup_commit(&oids->list[i]);
+		commit = lookup_commit(the_repository, &oids->list[i]);
 
 		if (commit)
 			commit->object.flags &= ~UNINTERESTING;
 	}
 }
 
+static void compute_generation_numbers(struct packed_commit_list* commits)
+{
+	int i;
+	struct commit_list *list = NULL;
+
+	for (i = 0; i < commits->nr; i++) {
+		if (commits->list[i]->generation != GENERATION_NUMBER_INFINITY &&
+		    commits->list[i]->generation != GENERATION_NUMBER_ZERO)
+			continue;
+
+		commit_list_insert(commits->list[i], &list);
+		while (list) {
+			struct commit *current = list->item;
+			struct commit_list *parent;
+			int all_parents_computed = 1;
+			uint32_t max_generation = 0;
+
+			for (parent = current->parents; parent; parent = parent->next) {
+				if (parent->item->generation == GENERATION_NUMBER_INFINITY ||
+				    parent->item->generation == GENERATION_NUMBER_ZERO) {
+					all_parents_computed = 0;
+					commit_list_insert(parent->item, &list);
+					break;
+				} else if (parent->item->generation > max_generation) {
+					max_generation = parent->item->generation;
+				}
+			}
+
+			if (all_parents_computed) {
+				current->generation = max_generation + 1;
+				pop_commit(&list);
+
+				if (current->generation > GENERATION_NUMBER_MAX)
+					current->generation = GENERATION_NUMBER_MAX;
+			}
+		}
+	}
+}
+
+static int add_ref_to_list(const char *refname,
+			   const struct object_id *oid,
+			   int flags, void *cb_data)
+{
+	struct string_list *list = (struct string_list *)cb_data;
+
+	string_list_append(list, oid_to_hex(oid));
+	return 0;
+}
+
+void write_commit_graph_reachable(const char *obj_dir, int append)
+{
+	struct string_list list;
+
+	string_list_init(&list, 1);
+	for_each_ref(add_ref_to_list, &list);
+	write_commit_graph(obj_dir, NULL, &list, append);
+}
+
 void write_commit_graph(const char *obj_dir,
-			const char **pack_indexes,
-			int nr_packs,
-			const char **commit_hex,
-			int nr_commits,
+			struct string_list *pack_indexes,
+			struct string_list *commit_hex,
 			int append)
 {
 	struct packed_oid_list oids;
@@ -584,7 +713,6 @@ void write_commit_graph(const char *obj_dir,
 	struct hashfile *f;
 	uint32_t i, count_distinct = 0;
 	char *graph_name;
-	int fd;
 	struct lock_file lk = LOCK_INIT;
 	uint32_t chunk_ids[5];
 	uint64_t chunk_offsets[5];
@@ -592,20 +720,25 @@ void write_commit_graph(const char *obj_dir,
 	int num_extra_edges;
 	struct commit_list *parent;
 
+	if (!commit_graph_compatible(the_repository))
+		return;
+
 	oids.nr = 0;
 	oids.alloc = approximate_object_count() / 4;
 
 	if (append) {
-		prepare_commit_graph_one(obj_dir);
-		if (commit_graph)
-			oids.alloc += commit_graph->num_commits;
+		prepare_commit_graph_one(the_repository, obj_dir);
+		if (the_repository->objects->commit_graph)
+			oids.alloc += the_repository->objects->commit_graph->num_commits;
 	}
 
 	if (oids.alloc < 1024)
 		oids.alloc = 1024;
 	ALLOC_ARRAY(oids.list, oids.alloc);
 
-	if (append && commit_graph) {
+	if (append && the_repository->objects->commit_graph) {
+		struct commit_graph *commit_graph =
+			the_repository->objects->commit_graph;
 		for (i = 0; i < commit_graph->num_commits; i++) {
 			const unsigned char *hash = commit_graph->chunk_oid_lookup +
 				commit_graph->hash_len * i;
@@ -618,31 +751,32 @@ void write_commit_graph(const char *obj_dir,
 		int dirlen;
 		strbuf_addf(&packname, "%s/pack/", obj_dir);
 		dirlen = packname.len;
-		for (i = 0; i < nr_packs; i++) {
+		for (i = 0; i < pack_indexes->nr; i++) {
 			struct packed_git *p;
 			strbuf_setlen(&packname, dirlen);
-			strbuf_addstr(&packname, pack_indexes[i]);
+			strbuf_addstr(&packname, pack_indexes->items[i].string);
 			p = add_packed_git(packname.buf, packname.len, 1);
 			if (!p)
-				die("error adding pack %s", packname.buf);
+				die(_("error adding pack %s"), packname.buf);
 			if (open_pack_index(p))
-				die("error opening index for %s", packname.buf);
-			for_each_object_in_pack(p, add_packed_commits, &oids);
+				die(_("error opening index for %s"), packname.buf);
+			for_each_object_in_pack(p, add_packed_commits, &oids, 0);
 			close_pack(p);
 		}
 		strbuf_release(&packname);
 	}
 
 	if (commit_hex) {
-		for (i = 0; i < nr_commits; i++) {
+		for (i = 0; i < commit_hex->nr; i++) {
 			const char *end;
 			struct object_id oid;
 			struct commit *result;
 
-			if (commit_hex[i] && parse_oid_hex(commit_hex[i], &oid, &end))
+			if (commit_hex->items[i].string &&
+			    parse_oid_hex(commit_hex->items[i].string, &oid, &end))
 				continue;
 
-			result = lookup_commit_reference_gently(&oid, 1);
+			result = lookup_commit_reference_gently(the_repository, &oid, 1);
 
 			if (result) {
 				ALLOC_GROW(oids.list, oids.nr + 1, oids.alloc);
@@ -678,7 +812,7 @@ void write_commit_graph(const char *obj_dir,
 		if (i > 0 && !oidcmp(&oids.list[i-1], &oids.list[i]))
 			continue;
 
-		commits.list[commits.nr] = lookup_commit(&oids.list[i]);
+		commits.list[commits.nr] = lookup_commit(the_repository, &oids.list[i]);
 		parse_commit(commits.list[commits.nr]);
 
 		for (parent = commits.list[commits.nr]->parents;
@@ -695,24 +829,14 @@ void write_commit_graph(const char *obj_dir,
 	if (commits.nr >= GRAPH_PARENT_MISSING)
 		die(_("too many commits to write graph"));
 
-	graph_name = get_commit_graph_filename(obj_dir);
-	fd = hold_lock_file_for_update(&lk, graph_name, 0);
-
-	if (fd < 0) {
-		struct strbuf folder = STRBUF_INIT;
-		strbuf_addstr(&folder, graph_name);
-		strbuf_setlen(&folder, strrchr(folder.buf, '/') - folder.buf);
-
-		if (mkdir(folder.buf, 0777) < 0)
-			die_errno(_("cannot mkdir %s"), folder.buf);
-		strbuf_release(&folder);
+	compute_generation_numbers(&commits);
 
-		fd = hold_lock_file_for_update(&lk, graph_name, LOCK_DIE_ON_ERROR);
-
-		if (fd < 0)
-			die_errno("unable to create '%s'", graph_name);
-	}
+	graph_name = get_commit_graph_filename(obj_dir);
+	if (safe_create_leading_directories(graph_name))
+		die_errno(_("unable to create leading directories of %s"),
+			  graph_name);
 
+	hold_lock_file_for_update(&lk, graph_name, LOCK_DIE_ON_ERROR);
 	f = hashfd(lk.tempfile->fd, lk.tempfile->filename.buf);
 
 	hashwrite_be32(f, GRAPH_SIGNATURE);
@@ -751,7 +875,7 @@ void write_commit_graph(const char *obj_dir,
 	write_graph_chunk_data(f, GRAPH_OID_LEN, commits.list, commits.nr);
 	write_graph_chunk_large_edges(f, commits.list, commits.nr);
 
-	close_commit_graph();
+	close_commit_graph(the_repository);
 	finalize_hashfile(f, NULL, CSUM_HASH_IN_STREAM | CSUM_FSYNC);
 	commit_lock_file(&lk);
 
@@ -759,3 +883,191 @@ void write_commit_graph(const char *obj_dir,
 	oids.alloc = 0;
 	oids.nr = 0;
 }
+
+#define VERIFY_COMMIT_GRAPH_ERROR_HASH 2
+static int verify_commit_graph_error;
+
+static void graph_report(const char *fmt, ...)
+{
+	va_list ap;
+
+	verify_commit_graph_error = 1;
+	va_start(ap, fmt);
+	vfprintf(stderr, fmt, ap);
+	fprintf(stderr, "\n");
+	va_end(ap);
+}
+
+#define GENERATION_ZERO_EXISTS 1
+#define GENERATION_NUMBER_EXISTS 2
+
+int verify_commit_graph(struct repository *r, struct commit_graph *g)
+{
+	uint32_t i, cur_fanout_pos = 0;
+	struct object_id prev_oid, cur_oid, checksum;
+	int generation_zero = 0;
+	struct hashfile *f;
+	int devnull;
+
+	if (!g) {
+		graph_report("no commit-graph file loaded");
+		return 1;
+	}
+
+	verify_commit_graph_error = 0;
+
+	if (!g->chunk_oid_fanout)
+		graph_report("commit-graph is missing the OID Fanout chunk");
+	if (!g->chunk_oid_lookup)
+		graph_report("commit-graph is missing the OID Lookup chunk");
+	if (!g->chunk_commit_data)
+		graph_report("commit-graph is missing the Commit Data chunk");
+
+	if (verify_commit_graph_error)
+		return verify_commit_graph_error;
+
+	devnull = open("/dev/null", O_WRONLY);
+	f = hashfd(devnull, NULL);
+	hashwrite(f, g->data, g->data_len - g->hash_len);
+	finalize_hashfile(f, checksum.hash, CSUM_CLOSE);
+	if (hashcmp(checksum.hash, g->data + g->data_len - g->hash_len)) {
+		graph_report(_("the commit-graph file has incorrect checksum and is likely corrupt"));
+		verify_commit_graph_error = VERIFY_COMMIT_GRAPH_ERROR_HASH;
+	}
+
+	for (i = 0; i < g->num_commits; i++) {
+		struct commit *graph_commit;
+
+		hashcpy(cur_oid.hash, g->chunk_oid_lookup + g->hash_len * i);
+
+		if (i && oidcmp(&prev_oid, &cur_oid) >= 0)
+			graph_report("commit-graph has incorrect OID order: %s then %s",
+				     oid_to_hex(&prev_oid),
+				     oid_to_hex(&cur_oid));
+
+		oidcpy(&prev_oid, &cur_oid);
+
+		while (cur_oid.hash[0] > cur_fanout_pos) {
+			uint32_t fanout_value = get_be32(g->chunk_oid_fanout + cur_fanout_pos);
+
+			if (i != fanout_value)
+				graph_report("commit-graph has incorrect fanout value: fanout[%d] = %u != %u",
+					     cur_fanout_pos, fanout_value, i);
+			cur_fanout_pos++;
+		}
+
+		graph_commit = lookup_commit(r, &cur_oid);
+		if (!parse_commit_in_graph_one(g, graph_commit))
+			graph_report("failed to parse %s from commit-graph",
+				     oid_to_hex(&cur_oid));
+	}
+
+	while (cur_fanout_pos < 256) {
+		uint32_t fanout_value = get_be32(g->chunk_oid_fanout + cur_fanout_pos);
+
+		if (g->num_commits != fanout_value)
+			graph_report("commit-graph has incorrect fanout value: fanout[%d] = %u != %u",
+				     cur_fanout_pos, fanout_value, i);
+
+		cur_fanout_pos++;
+	}
+
+	if (verify_commit_graph_error & ~VERIFY_COMMIT_GRAPH_ERROR_HASH)
+		return verify_commit_graph_error;
+
+	for (i = 0; i < g->num_commits; i++) {
+		struct commit *graph_commit, *odb_commit;
+		struct commit_list *graph_parents, *odb_parents;
+		uint32_t max_generation = 0;
+
+		hashcpy(cur_oid.hash, g->chunk_oid_lookup + g->hash_len * i);
+
+		graph_commit = lookup_commit(r, &cur_oid);
+		odb_commit = (struct commit *)create_object(r, cur_oid.hash, alloc_commit_node(r));
+		if (parse_commit_internal(odb_commit, 0, 0)) {
+			graph_report("failed to parse %s from object database",
+				     oid_to_hex(&cur_oid));
+			continue;
+		}
+
+		if (oidcmp(&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),
+				     oid_to_hex(get_commit_tree_oid(graph_commit)),
+				     oid_to_hex(get_commit_tree_oid(odb_commit)));
+
+		graph_parents = graph_commit->parents;
+		odb_parents = odb_commit->parents;
+
+		while (graph_parents) {
+			if (odb_parents == NULL) {
+				graph_report("commit-graph parent list for commit %s is too long",
+					     oid_to_hex(&cur_oid));
+				break;
+			}
+
+			if (oidcmp(&graph_parents->item->object.oid, &odb_parents->item->object.oid))
+				graph_report("commit-graph parent for %s is %s != %s",
+					     oid_to_hex(&cur_oid),
+					     oid_to_hex(&graph_parents->item->object.oid),
+					     oid_to_hex(&odb_parents->item->object.oid));
+
+			if (graph_parents->item->generation > max_generation)
+				max_generation = graph_parents->item->generation;
+
+			graph_parents = graph_parents->next;
+			odb_parents = odb_parents->next;
+		}
+
+		if (odb_parents != NULL)
+			graph_report("commit-graph parent list for commit %s terminates early",
+				     oid_to_hex(&cur_oid));
+
+		if (!graph_commit->generation) {
+			if (generation_zero == GENERATION_NUMBER_EXISTS)
+				graph_report("commit-graph has generation number zero for commit %s, but non-zero elsewhere",
+					     oid_to_hex(&cur_oid));
+			generation_zero = GENERATION_ZERO_EXISTS;
+		} else if (generation_zero == GENERATION_ZERO_EXISTS)
+			graph_report("commit-graph has non-zero generation number for commit %s, but zero elsewhere",
+				     oid_to_hex(&cur_oid));
+
+		if (generation_zero == GENERATION_ZERO_EXISTS)
+			continue;
+
+		/*
+		 * If one of our parents has generation GENERATION_NUMBER_MAX, then
+		 * our generation is also GENERATION_NUMBER_MAX. Decrement to avoid
+		 * extra logic in the following condition.
+		 */
+		if (max_generation == GENERATION_NUMBER_MAX)
+			max_generation--;
+
+		if (graph_commit->generation != max_generation + 1)
+			graph_report("commit-graph generation for commit %s is %u != %u",
+				     oid_to_hex(&cur_oid),
+				     graph_commit->generation,
+				     max_generation + 1);
+
+		if (graph_commit->date != odb_commit->date)
+			graph_report("commit date for commit %s in commit-graph is %"PRItime" != %"PRItime,
+				     oid_to_hex(&cur_oid),
+				     graph_commit->date,
+				     odb_commit->date);
+	}
+
+	return verify_commit_graph_error;
+}
+
+void free_commit_graph(struct commit_graph *g)
+{
+	if (!g)
+		return;
+	if (g->graph_fd >= 0) {
+		munmap((void *)g->data, g->data_len);
+		g->data = NULL;
+		close(g->graph_fd);
+	}
+	free(g);
+}