merge(3p/git): Merge git upstream at v2.26.2

third_party/git/builtin/fetch.c

@@ -7,6 +7,7 @@
 #include "refs.h"
 #include "refspec.h"
 #include "object-store.h"
+#include "oidset.h"
 #include "commit.h"
 #include "builtin.h"
 #include "string-list.h"
@@ -23,6 +24,9 @@
 #include "packfile.h"
 #include "list-objects-filter-options.h"
 #include "commit-reach.h"
+#include "branch.h"
+#include "promisor-remote.h"
+#include "commit-graph.h"
 
 #define FORCED_UPDATES_DELAY_WARNING_IN_MS (10 * 1000)
 
@@ -50,11 +54,13 @@ static int fetch_prune_tags_config = -1; /* unspecified */
 static int prune_tags = -1; /* unspecified */
 #define PRUNE_TAGS_BY_DEFAULT 0 /* do we prune tags by default? */
 
-static int all, append, dry_run, force, keep, multiple, update_head_ok, verbosity, deepen_relative;
+static int all, append, dry_run, force, keep, multiple, update_head_ok;
+static int verbosity, deepen_relative, set_upstream;
 static int progress = -1;
 static int enable_auto_gc = 1;
 static int tags = TAGS_DEFAULT, unshallow, update_shallow, deepen;
-static int max_children = 1;
+static int max_jobs = -1, submodule_fetch_jobs_config = -1;
+static int fetch_parallel_config = 1;
 static enum transport_family family;
 static const char *depth;
 static const char *deepen_since;
@@ -71,6 +77,7 @@ static struct refspec refmap = REFSPEC_INIT_FETCH;
 static struct list_objects_filter_options filter_options;
 static struct string_list server_options = STRING_LIST_INIT_DUP;
 static struct string_list negotiation_tip = STRING_LIST_INIT_NODUP;
+static int fetch_write_commit_graph = -1;
 
 static int git_fetch_config(const char *k, const char *v, void *cb)
 {
@@ -96,13 +103,20 @@ static int git_fetch_config(const char *k, const char *v, void *cb)
 	}
 
 	if (!strcmp(k, "submodule.fetchjobs")) {
-		max_children = parse_submodule_fetchjobs(k, v);
+		submodule_fetch_jobs_config = parse_submodule_fetchjobs(k, v);
 		return 0;
 	} else if (!strcmp(k, "fetch.recursesubmodules")) {
 		recurse_submodules = parse_fetch_recurse_submodules_arg(k, v);
 		return 0;
 	}
 
+	if (!strcmp(k, "fetch.parallel")) {
+		fetch_parallel_config = git_config_int(k, v);
+		if (fetch_parallel_config < 0)
+			die(_("fetch.parallel cannot be negative"));
+		return 0;
+	}
+
 	return git_default_config(k, v, cb);
 }
 
@@ -123,6 +137,8 @@ static struct option builtin_fetch_options[] = {
 	OPT__VERBOSITY(&verbosity),
 	OPT_BOOL(0, "all", &all,
 		 N_("fetch from all remotes")),
+	OPT_BOOL(0, "set-upstream", &set_upstream,
+		 N_("set upstream for git pull/fetch")),
 	OPT_BOOL('a', "append", &append,
 		 N_("append to .git/FETCH_HEAD instead of overwriting")),
 	OPT_STRING(0, "upload-pack", &upload_pack, N_("path"),
@@ -134,7 +150,7 @@ static struct option builtin_fetch_options[] = {
 		    N_("fetch all tags and associated objects"), TAGS_SET),
 	OPT_SET_INT('n', NULL, &tags,
 		    N_("do not fetch all tags (--no-tags)"), TAGS_UNSET),
-	OPT_INTEGER('j', "jobs", &max_children,
+	OPT_INTEGER('j', "jobs", &max_jobs,
 		    N_("number of submodules fetched in parallel")),
 	OPT_BOOL('p', "prune", &prune,
 		 N_("prune remote-tracking branches no longer on remote")),
@@ -183,6 +199,8 @@ static struct option builtin_fetch_options[] = {
 		 N_("run 'gc --auto' after fetching")),
 	OPT_BOOL(0, "show-forced-updates", &fetch_show_forced_updates,
 		 N_("check for forced-updates on all updated branches")),
+	OPT_BOOL(0, "write-commit-graph", &fetch_write_commit_graph,
+		 N_("write the commit-graph after fetching")),
 	OPT_END()
 };
 
@@ -239,32 +257,31 @@ static void add_merge_config(struct ref **head,
 	}
 }
 
-static int will_fetch(struct ref **head, const unsigned char *sha1)
+static void create_fetch_oidset(struct ref **head, struct oidset *out)
 {
 	struct ref *rm = *head;
 	while (rm) {
-		if (hasheq(rm->old_oid.hash, sha1))
-			return 1;
+		oidset_insert(out, &rm->old_oid);
 		rm = rm->next;
 	}
-	return 0;
 }
 
 struct refname_hash_entry {
-	struct hashmap_entry ent; /* must be the first member */
+	struct hashmap_entry ent;
 	struct object_id oid;
 	int ignore;
 	char refname[FLEX_ARRAY];
 };
 
 static int refname_hash_entry_cmp(const void *hashmap_cmp_fn_data,
-				  const void *e1_,
-				  const void *e2_,
+				  const struct hashmap_entry *eptr,
+				  const struct hashmap_entry *entry_or_key,
 				  const void *keydata)
 {
-	const struct refname_hash_entry *e1 = e1_;
-	const struct refname_hash_entry *e2 = e2_;
+	const struct refname_hash_entry *e1, *e2;
 
+	e1 = container_of(eptr, const struct refname_hash_entry, ent);
+	e2 = container_of(entry_or_key, const struct refname_hash_entry, ent);
 	return strcmp(e1->refname, keydata ? keydata : e2->refname);
 }
 
@@ -276,9 +293,9 @@ static struct refname_hash_entry *refname_hash_add(struct hashmap *map,
 	size_t len = strlen(refname);
 
 	FLEX_ALLOC_MEM(ent, refname, refname, len);
-	hashmap_entry_init(ent, strhash(refname));
+	hashmap_entry_init(&ent->ent, strhash(refname));
 	oidcpy(&ent->oid, oid);
-	hashmap_add(map, ent);
+	hashmap_add(map, &ent->ent);
 	return ent;
 }
 
@@ -313,13 +330,16 @@ static void find_non_local_tags(const struct ref *refs,
 {
 	struct hashmap existing_refs;
 	struct hashmap remote_refs;
+	struct oidset fetch_oids = OIDSET_INIT;
 	struct string_list remote_refs_list = STRING_LIST_INIT_NODUP;
 	struct string_list_item *remote_ref_item;
 	const struct ref *ref;
 	struct refname_hash_entry *item = NULL;
+	const int quick_flags = OBJECT_INFO_QUICK | OBJECT_INFO_SKIP_FETCH_OBJECT;
 
 	refname_hash_init(&existing_refs);
 	refname_hash_init(&remote_refs);
+	create_fetch_oidset(head, &fetch_oids);
 
 	for_each_ref(add_one_refname, &existing_refs);
 	for (ref = refs; ref; ref = ref->next) {
@@ -334,11 +354,10 @@ static void find_non_local_tags(const struct ref *refs,
 		 */
 		if (ends_with(ref->name, "^{}")) {
 			if (item &&
-			    !has_object_file_with_flags(&ref->old_oid,
-							OBJECT_INFO_QUICK) &&
-			    !will_fetch(head, ref->old_oid.hash) &&
-			    !has_object_file_with_flags(&item->oid, OBJECT_INFO_QUICK) &&
-			    !will_fetch(head, item->oid.hash))
+			    !has_object_file_with_flags(&ref->old_oid, quick_flags) &&
+			    !oidset_contains(&fetch_oids, &ref->old_oid) &&
+			    !has_object_file_with_flags(&item->oid, quick_flags) &&
+			    !oidset_contains(&fetch_oids, &item->oid))
 				clear_item(item);
 			item = NULL;
 			continue;
@@ -351,8 +370,8 @@ static void find_non_local_tags(const struct ref *refs,
 		 * fetch.
 		 */
 		if (item &&
-		    !has_object_file_with_flags(&item->oid, OBJECT_INFO_QUICK) &&
-		    !will_fetch(head, item->oid.hash))
+		    !has_object_file_with_flags(&item->oid, quick_flags) &&
+		    !oidset_contains(&fetch_oids, &item->oid))
 			clear_item(item);
 
 		item = NULL;
@@ -365,15 +384,15 @@ static void find_non_local_tags(const struct ref *refs,
 		item = refname_hash_add(&remote_refs, ref->name, &ref->old_oid);
 		string_list_insert(&remote_refs_list, ref->name);
 	}
-	hashmap_free(&existing_refs, 1);
+	hashmap_free_entries(&existing_refs, struct refname_hash_entry, ent);
 
 	/*
 	 * We may have a final lightweight tag that needs to be
 	 * checked to see if it needs fetching.
 	 */
 	if (item &&
-	    !has_object_file_with_flags(&item->oid, OBJECT_INFO_QUICK) &&
-	    !will_fetch(head, item->oid.hash))
+	    !has_object_file_with_flags(&item->oid, quick_flags) &&
+	    !oidset_contains(&fetch_oids, &item->oid))
 		clear_item(item);
 
 	/*
@@ -383,8 +402,10 @@ static void find_non_local_tags(const struct ref *refs,
 	for_each_string_list_item(remote_ref_item, &remote_refs_list) {
 		const char *refname = remote_ref_item->string;
 		struct ref *rm;
+		unsigned int hash = strhash(refname);
 
-		item = hashmap_get_from_hash(&remote_refs, strhash(refname), refname);
+		item = hashmap_get_entry_from_hash(&remote_refs, hash, refname,
+					struct refname_hash_entry, ent);
 		if (!item)
 			BUG("unseen remote ref?");
 
@@ -398,8 +419,9 @@ static void find_non_local_tags(const struct ref *refs,
 		**tail = rm;
 		*tail = &rm->next;
 	}
-	hashmap_free(&remote_refs, 1);
+	hashmap_free_entries(&remote_refs, struct refname_hash_entry, ent);
 	string_list_clear(&remote_refs_list, 0);
+	oidset_clear(&fetch_oids);
 }
 
 static struct ref *get_ref_map(struct remote *remote,
@@ -516,17 +538,18 @@ static struct ref *get_ref_map(struct remote *remote,
 		if (rm->peer_ref) {
 			const char *refname = rm->peer_ref->name;
 			struct refname_hash_entry *peer_item;
+			unsigned int hash = strhash(refname);
 
-			peer_item = hashmap_get_from_hash(&existing_refs,
-							  strhash(refname),
-							  refname);
+			peer_item = hashmap_get_entry_from_hash(&existing_refs,
+						hash, refname,
+						struct refname_hash_entry, ent);
 			if (peer_item) {
 				struct object_id *old_oid = &peer_item->oid;
 				oidcpy(&rm->peer_ref->old_oid, old_oid);
 			}
 		}
 	}
-	hashmap_free(&existing_refs, 1);
+	hashmap_free_entries(&existing_refs, struct refname_hash_entry, ent);
 
 	return ref_map;
 }
@@ -883,8 +906,17 @@ static int store_updated_refs(const char *raw_url, const char *remote_name,
 		url = xstrdup("foreign");
 
 	if (!connectivity_checked) {
+		struct check_connected_options opt = CHECK_CONNECTED_INIT;
+
+		if (filter_options.choice)
+			/*
+			 * Since a filter is specified, objects indirectly
+			 * referenced by refs are allowed to be absent.
+			 */
+			opt.check_refs_are_promisor_objects_only = 1;
+
 		rm = ref_map;
-		if (check_connected(iterate_ref_map, &rm, NULL)) {
+		if (check_connected(iterate_ref_map, &rm, &opt)) {
 			rc = error(_("%s did not send all necessary objects\n"), url);
 			goto abort;
 		}
@@ -934,18 +966,12 @@ static int store_updated_refs(const char *raw_url, const char *remote_name,
 				kind = "";
 				what = "";
 			}
-			else if (starts_with(rm->name, "refs/heads/")) {
+			else if (skip_prefix(rm->name, "refs/heads/", &what))
 				kind = "branch";
-				what = rm->name + 11;
-			}
-			else if (starts_with(rm->name, "refs/tags/")) {
+			else if (skip_prefix(rm->name, "refs/tags/", &what))
 				kind = "tag";
-				what = rm->name + 10;
-			}
-			else if (starts_with(rm->name, "refs/remotes/")) {
+			else if (skip_prefix(rm->name, "refs/remotes/", &what))
 				kind = "remote-tracking branch";
-				what = rm->name + 13;
-			}
 			else {
 				kind = "";
 				what = rm->name;
@@ -1054,7 +1080,8 @@ static int check_exist_and_connected(struct ref *ref_map)
 	 * we need all direct targets to exist.
 	 */
 	for (r = rm; r; r = r->next) {
-		if (!has_object_file(&r->old_oid))
+		if (!has_object_file_with_flags(&r->old_oid,
+						OBJECT_INFO_SKIP_FETCH_OBJECT))
 			return -1;
 	}
 
@@ -1065,8 +1092,11 @@ static int check_exist_and_connected(struct ref *ref_map)
 static int fetch_refs(struct transport *transport, struct ref *ref_map)
 {
 	int ret = check_exist_and_connected(ref_map);
-	if (ret)
+	if (ret) {
+		trace2_region_enter("fetch", "fetch_refs", the_repository);
 		ret = transport_fetch_refs(transport, ref_map);
+		trace2_region_leave("fetch", "fetch_refs", the_repository);
+	}
 	if (!ret)
 		/*
 		 * Keep the new pack's ".keep" file around to allow the caller
@@ -1082,11 +1112,14 @@ static int consume_refs(struct transport *transport, struct ref *ref_map)
 {
 	int connectivity_checked = transport->smart_options
 		? transport->smart_options->connectivity_checked : 0;
-	int ret = store_updated_refs(transport->url,
-				     transport->remote->name,
-				     connectivity_checked,
-				     ref_map);
+	int ret;
+	trace2_region_enter("fetch", "consume_refs", the_repository);
+	ret = store_updated_refs(transport->url,
+				 transport->remote->name,
+				 connectivity_checked,
+				 ref_map);
 	transport_unlock_pack(transport);
+	trace2_region_leave("fetch", "consume_refs", the_repository);
 	return ret;
 }
 
@@ -1238,13 +1271,10 @@ static struct transport *prepare_transport(struct remote *remote, int deepen)
 	if (update_shallow)
 		set_option(transport, TRANS_OPT_UPDATE_SHALLOW, "yes");
 	if (filter_options.choice) {
-		struct strbuf expanded_filter_spec = STRBUF_INIT;
-		expand_list_objects_filter_spec(&filter_options,
-						&expanded_filter_spec);
-		set_option(transport, TRANS_OPT_LIST_OBJECTS_FILTER,
-			   expanded_filter_spec.buf);
+		const char *spec =
+			expand_list_objects_filter_spec(&filter_options);
+		set_option(transport, TRANS_OPT_LIST_OBJECTS_FILTER, spec);
 		set_option(transport, TRANS_OPT_FROM_PROMISOR, "1");
-		strbuf_release(&expanded_filter_spec);
 	}
 	if (negotiation_tip.nr) {
 		if (transport->smart_options)
@@ -1334,9 +1364,11 @@ static int do_fetch(struct transport *transport,
 			argv_array_push(&ref_prefixes, "refs/tags/");
 	}
 
-	if (must_list_refs)
+	if (must_list_refs) {
+		trace2_region_enter("fetch", "remote_refs", the_repository);
 		remote_refs = transport_get_remote_refs(transport, &ref_prefixes);
-	else
+		trace2_region_leave("fetch", "remote_refs", the_repository);
+	} else
 		remote_refs = NULL;
 
 	argv_array_clear(&ref_prefixes);
@@ -1367,6 +1399,51 @@ static int do_fetch(struct transport *transport,
 		retcode = 1;
 		goto cleanup;
 	}
+
+	if (set_upstream) {
+		struct branch *branch = branch_get("HEAD");
+		struct ref *rm;
+		struct ref *source_ref = NULL;
+
+		/*
+		 * We're setting the upstream configuration for the
+		 * current branch. The relevant upstream is the
+		 * fetched branch that is meant to be merged with the
+		 * current one, i.e. the one fetched to FETCH_HEAD.
+		 *
+		 * When there are several such branches, consider the
+		 * request ambiguous and err on the safe side by doing
+		 * nothing and just emit a warning.
+		 */
+		for (rm = ref_map; rm; rm = rm->next) {
+			if (!rm->peer_ref) {
+				if (source_ref) {
+					warning(_("multiple branches detected, incompatible with --set-upstream"));
+					goto skip;
+				} else {
+					source_ref = rm;
+				}
+			}
+		}
+		if (source_ref) {
+			if (!strcmp(source_ref->name, "HEAD") ||
+			    starts_with(source_ref->name, "refs/heads/"))
+				install_branch_config(0,
+						      branch->name,
+						      transport->remote->name,
+						      source_ref->name);
+			else if (starts_with(source_ref->name, "refs/remotes/"))
+				warning(_("not setting upstream for a remote remote-tracking branch"));
+			else if (starts_with(source_ref->name, "refs/tags/"))
+				warning(_("not setting upstream for a remote tag"));
+			else
+				warning(_("unknown branch type"));
+		} else {
+			warning(_("no source branch found.\n"
+				"you need to specify exactly one branch with the --set-upstream option."));
+		}
+	}
+ skip:
 	free_refs(ref_map);
 
 	/* if neither --no-tags nor --tags was specified, do automated tag
@@ -1463,7 +1540,62 @@ static void add_options_to_argv(struct argv_array *argv)
 
 }
 
-static int fetch_multiple(struct string_list *list)
+/* Fetch multiple remotes in parallel */
+
+struct parallel_fetch_state {
+	const char **argv;
+	struct string_list *remotes;
+	int next, result;
+};
+
+static int fetch_next_remote(struct child_process *cp, struct strbuf *out,
+			     void *cb, void **task_cb)
+{
+	struct parallel_fetch_state *state = cb;
+	char *remote;
+
+	if (state->next < 0 || state->next >= state->remotes->nr)
+		return 0;
+
+	remote = state->remotes->items[state->next++].string;
+	*task_cb = remote;
+
+	argv_array_pushv(&cp->args, state->argv);
+	argv_array_push(&cp->args, remote);
+	cp->git_cmd = 1;
+
+	if (verbosity >= 0)
+		printf(_("Fetching %s\n"), remote);
+
+	return 1;
+}
+
+static int fetch_failed_to_start(struct strbuf *out, void *cb, void *task_cb)
+{
+	struct parallel_fetch_state *state = cb;
+	const char *remote = task_cb;
+
+	state->result = error(_("Could not fetch %s"), remote);
+
+	return 0;
+}
+
+static int fetch_finished(int result, struct strbuf *out,
+			  void *cb, void *task_cb)
+{
+	struct parallel_fetch_state *state = cb;
+	const char *remote = task_cb;
+
+	if (result) {
+		strbuf_addf(out, _("could not fetch '%s' (exit code: %d)\n"),
+			    remote, result);
+		state->result = -1;
+	}
+
+	return 0;
+}
+
+static int fetch_multiple(struct string_list *list, int max_children)
 {
 	int i, result = 0;
 	struct argv_array argv = ARGV_ARRAY_INIT;
@@ -1474,23 +1606,38 @@ static int fetch_multiple(struct string_list *list)
 			return errcode;
 	}
 
-	argv_array_pushl(&argv, "fetch", "--append", "--no-auto-gc", NULL);
+	argv_array_pushl(&argv, "fetch", "--append", "--no-auto-gc",
+			"--no-write-commit-graph", NULL);
 	add_options_to_argv(&argv);
 
-	for (i = 0; i < list->nr; i++) {
-		const char *name = list->items[i].string;
-		argv_array_push(&argv, name);
-		if (verbosity >= 0)
-			printf(_("Fetching %s\n"), name);
-		if (run_command_v_opt(argv.argv, RUN_GIT_CMD)) {
-			error(_("Could not fetch %s"), name);
-			result = 1;
+	if (max_children != 1 && list->nr != 1) {
+		struct parallel_fetch_state state = { argv.argv, list, 0, 0 };
+
+		argv_array_push(&argv, "--end-of-options");
+		result = run_processes_parallel_tr2(max_children,
+						    &fetch_next_remote,
+						    &fetch_failed_to_start,
+						    &fetch_finished,
+						    &state,
+						    "fetch", "parallel/fetch");
+
+		if (!result)
+			result = state.result;
+	} else
+		for (i = 0; i < list->nr; i++) {
+			const char *name = list->items[i].string;
+			argv_array_push(&argv, name);
+			if (verbosity >= 0)
+				printf(_("Fetching %s\n"), name);
+			if (run_command_v_opt(argv.argv, RUN_GIT_CMD)) {
+				error(_("Could not fetch %s"), name);
+				result = 1;
+			}
+			argv_array_pop(&argv);
 		}
-		argv_array_pop(&argv);
-	}
 
 	argv_array_clear(&argv);
-	return result;
+	return !!result;
 }
 
 /*
@@ -1510,37 +1657,27 @@ static inline void fetch_one_setup_partial(struct remote *remote)
 	 * If no prior partial clone/fetch and the current fetch DID NOT
 	 * request a partial-fetch, do a normal fetch.
 	 */
-	if (!repository_format_partial_clone && !filter_options.choice)
+	if (!has_promisor_remote() && !filter_options.choice)
 		return;
 
 	/*
-	 * If this is the FIRST partial-fetch request, we enable partial
-	 * on this repo and remember the given filter-spec as the default
-	 * for subsequent fetches to this remote.
+	 * If this is a partial-fetch request, we enable partial on
+	 * this repo if not already enabled and remember the given
+	 * filter-spec as the default for subsequent fetches to this
+	 * remote.
 	 */
-	if (!repository_format_partial_clone && filter_options.choice) {
+	if (filter_options.choice) {
 		partial_clone_register(remote->name, &filter_options);
 		return;
 	}
 
-	/*
-	 * We are currently limited to only ONE promisor remote and only
-	 * allow partial-fetches from the promisor remote.
-	 */
-	if (strcmp(remote->name, repository_format_partial_clone)) {
-		if (filter_options.choice)
-			die(_("--filter can only be used with the remote "
-			      "configured in extensions.partialClone"));
-		return;
-	}
-
 	/*
 	 * Do a partial-fetch from the promisor remote using either the
 	 * explicitly given filter-spec or inherit the filter-spec from
 	 * the config.
 	 */
 	if (!filter_options.choice)
-		partial_clone_get_default_filter_spec(&filter_options);
+		partial_clone_get_default_filter_spec(&filter_options, remote->name);
 	return;
 }
 
@@ -1626,14 +1763,13 @@ int cmd_fetch(int argc, const char **argv, const char *prefix)
 
 	packet_trace_identity("fetch");
 
-	fetch_if_missing = 0;
-
 	/* Record the command line for the reflog */
 	strbuf_addstr(&default_rla, "fetch");
 	for (i = 1; i < argc; i++)
 		strbuf_addf(&default_rla, " %s", argv[i]);
 
-	fetch_config_from_gitmodules(&max_children, &recurse_submodules);
+	fetch_config_from_gitmodules(&submodule_fetch_jobs_config,
+				     &recurse_submodules);
 	git_config(git_fetch_config, NULL);
 
 	argc = parse_options(argc, argv, prefix,
@@ -1661,7 +1797,7 @@ int cmd_fetch(int argc, const char **argv, const char *prefix)
 	if (depth || deepen_since || deepen_not.nr)
 		deepen = 1;
 
-	if (filter_options.choice && !repository_format_partial_clone)
+	if (filter_options.choice && !has_promisor_remote())
 		die("--filter can only be used when extensions.partialClone is set");
 
 	if (all) {
@@ -1695,19 +1831,31 @@ int cmd_fetch(int argc, const char **argv, const char *prefix)
 	}
 
 	if (remote) {
-		if (filter_options.choice || repository_format_partial_clone)
+		if (filter_options.choice || has_promisor_remote())
 			fetch_one_setup_partial(remote);
 		result = fetch_one(remote, argc, argv, prune_tags_ok);
 	} else {
+		int max_children = max_jobs;
+
 		if (filter_options.choice)
 			die(_("--filter can only be used with the remote "
 			      "configured in extensions.partialclone"));
+
+		if (max_children < 0)
+			max_children = fetch_parallel_config;
+
 		/* TODO should this also die if we have a previous partial-clone? */
-		result = fetch_multiple(&list);
+		result = fetch_multiple(&list, max_children);
 	}
 
 	if (!result && (recurse_submodules != RECURSE_SUBMODULES_OFF)) {
 		struct argv_array options = ARGV_ARRAY_INIT;
+		int max_children = max_jobs;
+
+		if (max_children < 0)
+			max_children = submodule_fetch_jobs_config;
+		if (max_children < 0)
+			max_children = fetch_parallel_config;
 
 		add_options_to_argv(&options);
 		result = fetch_populated_submodules(the_repository,
@@ -1722,6 +1870,20 @@ int cmd_fetch(int argc, const char **argv, const char *prefix)
 
 	string_list_clear(&list, 0);
 
+	prepare_repo_settings(the_repository);
+	if (fetch_write_commit_graph > 0 ||
+	    (fetch_write_commit_graph < 0 &&
+	     the_repository->settings.fetch_write_commit_graph)) {
+		int commit_graph_flags = COMMIT_GRAPH_WRITE_SPLIT;
+
+		if (progress)
+			commit_graph_flags |= COMMIT_GRAPH_WRITE_PROGRESS;
+
+		write_commit_graph_reachable(the_repository->objects->odb,
+					     commit_graph_flags,
+					     NULL);
+	}
+
 	close_object_store(the_repository->objects);
 
 	if (enable_auto_gc) {