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	#include "cache.h"
	#include "object-store.h"
	#include "promisor-remote.h"
	#include "config.h"
	#include "transport.h"
	#include "strvec.h"

	static char *repository_format_partial_clone;

	void set_repository_format_partial_clone(char *partial_clone)
	{
	repository_format_partial_clone = xstrdup_or_null(partial_clone);
	}

	static int fetch_objects(const char *remote_name,
	const struct object_id *oids,
	int oid_nr)
	{
	struct child_process child = CHILD_PROCESS_INIT;
	int i;
	FILE *child_in;

	child.git_cmd = 1;
	child.in = -1;
	strvec_pushl(&child.args, "-c", "fetch.negotiationAlgorithm=noop",
	"fetch", remote_name, "--no-tags",
	"--no-write-fetch-head", "--recurse-submodules=no",
	"--filter=blob:none", "--stdin", NULL);
	if (start_command(&child))
	die(_("promisor-remote: unable to fork off fetch subprocess"));
	child_in = xfdopen(child.in, "w");

	for (i = 0; i < oid_nr; i++) {
	if (fputs(oid_to_hex(&oids[i]), child_in) < 0)
	die_errno(_("promisor-remote: could not write to fetch subprocess"));
	if (fputc('\n', child_in) < 0)
	die_errno(_("promisor-remote: could not write to fetch subprocess"));
	}

	if (fclose(child_in) < 0)
	die_errno(_("promisor-remote: could not close stdin to fetch subprocess"));
	return finish_command(&child) ? -1 : 0;
	}

	static struct promisor_remote *promisors;
	static struct promisor_remote **promisors_tail = &promisors;

	static struct promisor_remote promisor_remote_new(const char remote_name)
	{
	struct promisor_remote *r;

	if (*remote_name == '/') {
	warning(_("promisor remote name cannot begin with '/': %s"),
	remote_name);
	return NULL;
	}

	FLEX_ALLOC_STR(r, name, remote_name);

	*promisors_tail = r;
	promisors_tail = &r->next;

	return r;
	}

	static struct promisor_remote promisor_remote_lookup(const char remote_name,
	struct promisor_remote **previous)
	{
	struct promisor_remote r, p;

	for (p = NULL, r = promisors; r; p = r, r = r->next)
	if (!strcmp(r->name, remote_name)) {
	if (previous)
	*previous = p;
	return r;
	}

	return NULL;
	}

	static void promisor_remote_move_to_tail(struct promisor_remote *r,
	struct promisor_remote *previous)
	{
	if (r->next == NULL)
	return;

	if (previous)
	previous->next = r->next;
	else
	promisors = r->next ? r->next : r;
	r->next = NULL;
	*promisors_tail = r;
	promisors_tail = &r->next;
	}

	static int promisor_remote_config(const char var, const char value, void *data)
	{
	const char *name;
	size_t namelen;
	const char *subkey;

	if (parse_config_key(var, "remote", &name, &namelen, &subkey) < 0)
	return 0;

	if (!strcmp(subkey, "promisor")) {
	char *remote_name;

	if (!git_config_bool(var, value))
	return 0;

	remote_name = xmemdupz(name, namelen);

	if (!promisor_remote_lookup(remote_name, NULL))
	promisor_remote_new(remote_name);

	free(remote_name);
	return 0;
	}
	if (!strcmp(subkey, "partialclonefilter")) {
	struct promisor_remote *r;
	char *remote_name = xmemdupz(name, namelen);

	r = promisor_remote_lookup(remote_name, NULL);
	if (!r)
	r = promisor_remote_new(remote_name);

	free(remote_name);

	if (!r)
	return 0;

	return git_config_string(&r->partial_clone_filter, var, value);
	}

	return 0;
	}

	static int initialized;

	static void promisor_remote_init(void)
	{
	if (initialized)
	return;
	initialized = 1;

	git_config(promisor_remote_config, NULL);

	if (repository_format_partial_clone) {
	struct promisor_remote o, previous;

	o = promisor_remote_lookup(repository_format_partial_clone,
	&previous);
	if (o)
	promisor_remote_move_to_tail(o, previous);
	else
	promisor_remote_new(repository_format_partial_clone);
	}
	}

	static void promisor_remote_clear(void)
	{
	while (promisors) {
	struct promisor_remote *r = promisors;
	promisors = promisors->next;
	free(r);
	}

	promisors_tail = &promisors;
	}

	void promisor_remote_reinit(void)
	{
	initialized = 0;
	promisor_remote_clear();
	promisor_remote_init();
	}

	struct promisor_remote promisor_remote_find(const char remote_name)
	{
	promisor_remote_init();

	if (!remote_name)
	return promisors;

	return promisor_remote_lookup(remote_name, NULL);
	}

	int has_promisor_remote(void)
	{
	return !!promisor_remote_find(NULL);
	}

	static int remove_fetched_oids(struct repository *repo,
	struct object_id **oids,
	int oid_nr, int to_free)
	{
	int i, remaining_nr = 0;
	int remaining = xcalloc(oid_nr, sizeof(remaining));
	struct object_id old_oids = oids;
	struct object_id *new_oids;

	for (i = 0; i < oid_nr; i++)
	if (oid_object_info_extended(repo, &old_oids[i], NULL,
	OBJECT_INFO_SKIP_FETCH_OBJECT)) {
	remaining[i] = 1;
	remaining_nr++;
	}

	if (remaining_nr) {
	int j = 0;
	CALLOC_ARRAY(new_oids, remaining_nr);
	for (i = 0; i < oid_nr; i++)
	if (remaining[i])
	oidcpy(&new_oids[j++], &old_oids[i]);
	*oids = new_oids;
	if (to_free)
	free(old_oids);
	}

	free(remaining);

	return remaining_nr;
	}

	int promisor_remote_get_direct(struct repository *repo,
	const struct object_id *oids,
	int oid_nr)
	{
	struct promisor_remote *r;
	struct object_id remaining_oids = (struct object_id )oids;
	int remaining_nr = oid_nr;
	int to_free = 0;
	int res = -1;

	if (oid_nr == 0)
	return 0;

	promisor_remote_init();

	for (r = promisors; r; r = r->next) {
	if (fetch_objects(r->name, remaining_oids, remaining_nr) < 0) {
	if (remaining_nr == 1)
	continue;
	remaining_nr = remove_fetched_oids(repo, &remaining_oids,
	remaining_nr, to_free);
	if (remaining_nr) {
	to_free = 1;
	continue;
	}
	}
	res = 0;
	break;
	}

	if (to_free)
	free(remaining_oids);

	return res;
	}

git / git

git/promisor-remote.c