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	#include "cache.h"
	#include "config.h"
	#include "refs.h"
	#include "pkt-line.h"
	#include "sideband.h"
	#include "repository.h"
	#include "object-store.h"
	#include "tag.h"
	#include "object.h"
	#include "commit.h"
	#include "diff.h"
	#include "revision.h"
	#include "list-objects.h"
	#include "list-objects-filter.h"
	#include "list-objects-filter-options.h"
	#include "run-command.h"
	#include "connect.h"
	#include "sigchain.h"
	#include "version.h"
	#include "string-list.h"
	#include "strvec.h"
	#include "prio-queue.h"
	#include "protocol.h"
	#include "quote.h"
	#include "upload-pack.h"
	#include "serve.h"
	#include "commit-graph.h"
	#include "commit-reach.h"
	#include "shallow.h"

	/* Remember to update object flag allocation in object.h */
	#define THEY_HAVE (1u << 11)
	#define OUR_REF (1u << 12)
	#define WANTED (1u << 13)
	#define COMMON_KNOWN (1u << 14)

	#define SHALLOW (1u << 16)
	#define NOT_SHALLOW (1u << 17)
	#define CLIENT_SHALLOW (1u << 18)
	#define HIDDEN_REF (1u << 19)

	#define ALL_FLAGS (THEY_HAVE \| OUR_REF \| WANTED \| COMMON_KNOWN \| SHALLOW \| \
	NOT_SHALLOW \| CLIENT_SHALLOW \| HIDDEN_REF)

	/* Enum for allowed unadvertised object request (UOR) */
	enum allow_uor {
	/* Allow specifying sha1 if it is a ref tip. */
	ALLOW_TIP_SHA1 = 0x01,
	/* Allow request of a sha1 if it is reachable from a ref (possibly hidden ref). */
	ALLOW_REACHABLE_SHA1 = 0x02,
	/* Allow request of any sha1. Implies ALLOW_TIP_SHA1 and ALLOW_REACHABLE_SHA1. */
	ALLOW_ANY_SHA1 = 0x07
	};

	/*
	* Please annotate, and if possible group together, fields used only
	* for protocol v0 or only for protocol v2.
	*/
	struct upload_pack_data {
	struct string_list symref; /* v0 only */
	struct object_array want_obj;
	struct object_array have_obj;
	struct oid_array haves; /* v2 only */
	struct string_list wanted_refs; /* v2 only */

	struct object_array shallows;
	struct string_list deepen_not;
	struct object_array extra_edge_obj;
	int depth;
	timestamp_t deepen_since;
	int deepen_rev_list;
	int deepen_relative;
	int keepalive;
	int shallow_nr;
	timestamp_t oldest_have;

	unsigned int timeout; /* v0 only */
	enum {
	NO_MULTI_ACK = 0,
	MULTI_ACK = 1,
	MULTI_ACK_DETAILED = 2
	} multi_ack; /* v0 only */

	/* 0 for no sideband, otherwise DEFAULT_PACKET_MAX or LARGE_PACKET_MAX */
	int use_sideband;

	struct string_list uri_protocols;
	enum allow_uor allow_uor;

	struct list_objects_filter_options filter_options;
	struct string_list allowed_filters;

	struct packet_writer writer;

	const char *pack_objects_hook;

	unsigned stateless_rpc : 1; /* v0 only */
	unsigned no_done : 1; /* v0 only */
	unsigned daemon_mode : 1; /* v0 only */
	unsigned filter_capability_requested : 1; /* v0 only */

	unsigned use_thin_pack : 1;
	unsigned use_ofs_delta : 1;
	unsigned no_progress : 1;
	unsigned use_include_tag : 1;
	unsigned wait_for_done : 1;
	unsigned allow_filter : 1;
	unsigned allow_filter_fallback : 1;
	unsigned long tree_filter_max_depth;

	unsigned done : 1; /* v2 only */
	unsigned allow_ref_in_want : 1; /* v2 only */
	unsigned allow_sideband_all : 1; /* v2 only */
	unsigned advertise_sid : 1;
	};

	static void upload_pack_data_init(struct upload_pack_data *data)
	{
	struct string_list symref = STRING_LIST_INIT_DUP;
	struct string_list wanted_refs = STRING_LIST_INIT_DUP;
	struct object_array want_obj = OBJECT_ARRAY_INIT;
	struct object_array have_obj = OBJECT_ARRAY_INIT;
	struct oid_array haves = OID_ARRAY_INIT;
	struct object_array shallows = OBJECT_ARRAY_INIT;
	struct string_list deepen_not = STRING_LIST_INIT_DUP;
	struct string_list uri_protocols = STRING_LIST_INIT_DUP;
	struct object_array extra_edge_obj = OBJECT_ARRAY_INIT;
	struct string_list allowed_filters = STRING_LIST_INIT_DUP;

	memset(data, 0, sizeof(*data));
	data->symref = symref;
	data->wanted_refs = wanted_refs;
	data->want_obj = want_obj;
	data->have_obj = have_obj;
	data->haves = haves;
	data->shallows = shallows;
	data->deepen_not = deepen_not;
	data->uri_protocols = uri_protocols;
	data->extra_edge_obj = extra_edge_obj;
	data->allowed_filters = allowed_filters;
	data->allow_filter_fallback = 1;
	data->tree_filter_max_depth = ULONG_MAX;
	packet_writer_init(&data->writer, 1);

	data->keepalive = 5;
	data->advertise_sid = 0;
	}

	static void upload_pack_data_clear(struct upload_pack_data *data)
	{
	string_list_clear(&data->symref, 1);
	string_list_clear(&data->wanted_refs, 1);
	object_array_clear(&data->want_obj);
	object_array_clear(&data->have_obj);
	oid_array_clear(&data->haves);
	object_array_clear(&data->shallows);
	string_list_clear(&data->deepen_not, 0);
	object_array_clear(&data->extra_edge_obj);
	list_objects_filter_release(&data->filter_options);
	string_list_clear(&data->allowed_filters, 0);

	free((char *)data->pack_objects_hook);
	}

	static void reset_timeout(unsigned int timeout)
	{
	alarm(timeout);
	}

	static void send_client_data(int fd, const char *data, ssize_t sz,
	int use_sideband)
	{
	if (use_sideband) {
	send_sideband(1, fd, data, sz, use_sideband);
	return;
	}
	if (fd == 3)
	/* emergency quit */
	fd = 2;
	if (fd == 2) {
	/* XXX: are we happy to lose stuff here? */
	xwrite(fd, data, sz);
	return;
	}
	write_or_die(fd, data, sz);
	}

	static int write_one_shallow(const struct commit_graft graft, void cb_data)
	{
	FILE *fp = cb_data;
	if (graft->nr_parent == -1)
	fprintf(fp, "--shallow %s\n", oid_to_hex(&graft->oid));
	return 0;
	}

	struct output_state {
	char buffer[8193];
	int used;
	unsigned packfile_uris_started : 1;
	unsigned packfile_started : 1;
	};

	static int relay_pack_data(int pack_objects_out, struct output_state *os,
	int use_sideband, int write_packfile_line)
	{
	/*
	* We keep the last byte to ourselves
	* in case we detect broken rev-list, so that we
	* can leave the stream corrupted. This is
	* unfortunate -- unpack-objects would happily
	* accept a valid packdata with trailing garbage,
	* so appending garbage after we pass all the
	* pack data is not good enough to signal
	* breakage to downstream.
	*/
	ssize_t readsz;

	readsz = xread(pack_objects_out, os->buffer + os->used,
	sizeof(os->buffer) - os->used);
	if (readsz < 0) {
	return readsz;
	}
	os->used += readsz;

	while (!os->packfile_started) {
	char *p;
	if (os->used >= 4 && !memcmp(os->buffer, "PACK", 4)) {
	os->packfile_started = 1;
	if (write_packfile_line) {
	if (os->packfile_uris_started)
	packet_delim(1);
	packet_write_fmt(1, "\1packfile\n");
	}
	break;
	}
	if ((p = memchr(os->buffer, '\n', os->used))) {
	if (!os->packfile_uris_started) {
	os->packfile_uris_started = 1;
	if (!write_packfile_line)
	BUG("packfile_uris requires sideband-all");
	packet_write_fmt(1, "\1packfile-uris\n");
	}
	*p = '\0';
	packet_write_fmt(1, "\1%s\n", os->buffer);

	os->used -= p - os->buffer + 1;
	memmove(os->buffer, p + 1, os->used);
	} else {
	/*
	* Incomplete line.
	*/
	return readsz;
	}
	}

	if (os->used > 1) {
	send_client_data(1, os->buffer, os->used - 1, use_sideband);
	os->buffer[0] = os->buffer[os->used - 1];
	os->used = 1;
	} else {
	send_client_data(1, os->buffer, os->used, use_sideband);
	os->used = 0;
	}

	return readsz;
	}

	static void create_pack_file(struct upload_pack_data *pack_data,
	const struct string_list *uri_protocols)
	{
	struct child_process pack_objects = CHILD_PROCESS_INIT;
	struct output_state output_state = { { 0 } };
	char progress[128];
	char abort_msg[] = "aborting due to possible repository "
	"corruption on the remote side.";
	ssize_t sz;
	int i;
	FILE *pipe_fd;

	if (!pack_data->pack_objects_hook)
	pack_objects.git_cmd = 1;
	else {
	strvec_push(&pack_objects.args, pack_data->pack_objects_hook);
	strvec_push(&pack_objects.args, "git");
	pack_objects.use_shell = 1;
	}

	if (pack_data->shallow_nr) {
	strvec_push(&pack_objects.args, "--shallow-file");
	strvec_push(&pack_objects.args, "");
	}
	strvec_push(&pack_objects.args, "pack-objects");
	strvec_push(&pack_objects.args, "--revs");
	if (pack_data->use_thin_pack)
	strvec_push(&pack_objects.args, "--thin");

	strvec_push(&pack_objects.args, "--stdout");
	if (pack_data->shallow_nr)
	strvec_push(&pack_objects.args, "--shallow");
	if (!pack_data->no_progress)
	strvec_push(&pack_objects.args, "--progress");
	if (pack_data->use_ofs_delta)
	strvec_push(&pack_objects.args, "--delta-base-offset");
	if (pack_data->use_include_tag)
	strvec_push(&pack_objects.args, "--include-tag");
	if (pack_data->filter_options.choice) {
	const char *spec =
	expand_list_objects_filter_spec(&pack_data->filter_options);
	strvec_pushf(&pack_objects.args, "--filter=%s", spec);
	}
	if (uri_protocols) {
	for (i = 0; i < uri_protocols->nr; i++)
	strvec_pushf(&pack_objects.args, "--uri-protocol=%s",
	uri_protocols->items[i].string);
	}

	pack_objects.in = -1;
	pack_objects.out = -1;
	pack_objects.err = -1;
	pack_objects.clean_on_exit = 1;

	if (start_command(&pack_objects))
	die("git upload-pack: unable to fork git-pack-objects");

	pipe_fd = xfdopen(pack_objects.in, "w");

	if (pack_data->shallow_nr)
	for_each_commit_graft(write_one_shallow, pipe_fd);

	for (i = 0; i < pack_data->want_obj.nr; i++)
	fprintf(pipe_fd, "%s\n",
	oid_to_hex(&pack_data->want_obj.objects[i].item->oid));
	fprintf(pipe_fd, "--not\n");
	for (i = 0; i < pack_data->have_obj.nr; i++)
	fprintf(pipe_fd, "%s\n",
	oid_to_hex(&pack_data->have_obj.objects[i].item->oid));
	for (i = 0; i < pack_data->extra_edge_obj.nr; i++)
	fprintf(pipe_fd, "%s\n",
	oid_to_hex(&pack_data->extra_edge_obj.objects[i].item->oid));
	fprintf(pipe_fd, "\n");
	fflush(pipe_fd);
	fclose(pipe_fd);

	/* We read from pack_objects.err to capture stderr output for
	* progress bar, and pack_objects.out to capture the pack data.
	*/

	while (1) {
	struct pollfd pfd[2];
	int pe, pu, pollsize, polltimeout;
	int ret;

	reset_timeout(pack_data->timeout);

	pollsize = 0;
	pe = pu = -1;

	if (0 <= pack_objects.out) {
	pfd[pollsize].fd = pack_objects.out;
	pfd[pollsize].events = POLLIN;
	pu = pollsize;
	pollsize++;
	}
	if (0 <= pack_objects.err) {
	pfd[pollsize].fd = pack_objects.err;
	pfd[pollsize].events = POLLIN;
	pe = pollsize;
	pollsize++;
	}

	if (!pollsize)
	break;

	polltimeout = pack_data->keepalive < 0
	? -1
	: 1000 * pack_data->keepalive;

	ret = poll(pfd, pollsize, polltimeout);

	if (ret < 0) {
	if (errno != EINTR) {
	error_errno("poll failed, resuming");
	sleep(1);
	}
	continue;
	}
	if (0 <= pe && (pfd[pe].revents & (POLLIN\|POLLHUP))) {
	/* Status ready; we ship that in the side-band
	* or dump to the standard error.
	*/
	sz = xread(pack_objects.err, progress,
	sizeof(progress));
	if (0 < sz)
	send_client_data(2, progress, sz,
	pack_data->use_sideband);
	else if (sz == 0) {
	close(pack_objects.err);
	pack_objects.err = -1;
	}
	else
	goto fail;
	/* give priority to status messages */
	continue;
	}
	if (0 <= pu && (pfd[pu].revents & (POLLIN\|POLLHUP))) {
	int result = relay_pack_data(pack_objects.out,
	&output_state,
	pack_data->use_sideband,
	!!uri_protocols);

	if (result == 0) {
	close(pack_objects.out);
	pack_objects.out = -1;
	} else if (result < 0) {
	goto fail;
	}
	}

	/*
	* We hit the keepalive timeout without saying anything; send
	* an empty message on the data sideband just to let the other
	* side know we're still working on it, but don't have any data
	* yet.
	*
	* If we don't have a sideband channel, there's no room in the
	* protocol to say anything, so those clients are just out of
	* luck.
	*/
	if (!ret && pack_data->use_sideband) {
	static const char buf[] = "0005\1";
	write_or_die(1, buf, 5);
	}
	}

	if (finish_command(&pack_objects)) {
	error("git upload-pack: git-pack-objects died with error.");
	goto fail;
	}

	/* flush the data */
	if (output_state.used > 0) {
	send_client_data(1, output_state.buffer, output_state.used,
	pack_data->use_sideband);
	fprintf(stderr, "flushed.\n");
	}
	if (pack_data->use_sideband)
	packet_flush(1);
	return;

	fail:
	send_client_data(3, abort_msg, sizeof(abort_msg),
	pack_data->use_sideband);
	die("git upload-pack: %s", abort_msg);
	}

	static int do_got_oid(struct upload_pack_data data, const struct object_id oid)
	{
	int we_knew_they_have = 0;
	struct object *o = parse_object(the_repository, oid);

	if (!o)
	die("oops (%s)", oid_to_hex(oid));
	if (o->type == OBJ_COMMIT) {
	struct commit_list *parents;
	struct commit commit = (struct commit )o;
	if (o->flags & THEY_HAVE)
	we_knew_they_have = 1;
	else
	o->flags \|= THEY_HAVE;
	if (!data->oldest_have \|\| (commit->date < data->oldest_have))
	data->oldest_have = commit->date;
	for (parents = commit->parents;
	parents;
	parents = parents->next)
	parents->item->object.flags \|= THEY_HAVE;
	}
	if (!we_knew_they_have) {
	add_object_array(o, NULL, &data->have_obj);
	return 1;
	}
	return 0;
	}

	static int got_oid(struct upload_pack_data *data,
	const char hex, struct object_id oid)
	{
	if (get_oid_hex(hex, oid))
	die("git upload-pack: expected SHA1 object, got '%s'", hex);
	if (!has_object_file_with_flags(oid,
	OBJECT_INFO_QUICK \| OBJECT_INFO_SKIP_FETCH_OBJECT))
	return -1;
	return do_got_oid(data, oid);
	}

	static int ok_to_give_up(struct upload_pack_data *data)
	{
	timestamp_t min_generation = GENERATION_NUMBER_ZERO;

	if (!data->have_obj.nr)
	return 0;

	return can_all_from_reach_with_flag(&data->want_obj, THEY_HAVE,
	COMMON_KNOWN, data->oldest_have,
	min_generation);
	}

	static int get_common_commits(struct upload_pack_data *data,
	struct packet_reader *reader)
	{
	struct object_id oid;
	char last_hex[GIT_MAX_HEXSZ + 1];
	int got_common = 0;
	int got_other = 0;
	int sent_ready = 0;

	save_commit_buffer = 0;

	for (;;) {
	const char *arg;

	reset_timeout(data->timeout);

	if (packet_reader_read(reader) != PACKET_READ_NORMAL) {
	if (data->multi_ack == MULTI_ACK_DETAILED
	&& got_common
	&& !got_other
	&& ok_to_give_up(data)) {
	sent_ready = 1;
	packet_write_fmt(1, "ACK %s ready\n", last_hex);
	}
	if (data->have_obj.nr == 0 \|\| data->multi_ack)
	packet_write_fmt(1, "NAK\n");

	if (data->no_done && sent_ready) {
	packet_write_fmt(1, "ACK %s\n", last_hex);
	return 0;
	}
	if (data->stateless_rpc)
	exit(0);
	got_common = 0;
	got_other = 0;
	continue;
	}
	if (skip_prefix(reader->line, "have ", &arg)) {
	switch (got_oid(data, arg, &oid)) {
	case -1: /* they have what we do not */
	got_other = 1;
	if (data->multi_ack
	&& ok_to_give_up(data)) {
	const char *hex = oid_to_hex(&oid);
	if (data->multi_ack == MULTI_ACK_DETAILED) {
	sent_ready = 1;
	packet_write_fmt(1, "ACK %s ready\n", hex);
	} else
	packet_write_fmt(1, "ACK %s continue\n", hex);
	}
	break;
	default:
	got_common = 1;
	oid_to_hex_r(last_hex, &oid);
	if (data->multi_ack == MULTI_ACK_DETAILED)
	packet_write_fmt(1, "ACK %s common\n", last_hex);
	else if (data->multi_ack)
	packet_write_fmt(1, "ACK %s continue\n", last_hex);
	else if (data->have_obj.nr == 1)
	packet_write_fmt(1, "ACK %s\n", last_hex);
	break;
	}
	continue;
	}
	if (!strcmp(reader->line, "done")) {
	if (data->have_obj.nr > 0) {
	if (data->multi_ack)
	packet_write_fmt(1, "ACK %s\n", last_hex);
	return 0;
	}
	packet_write_fmt(1, "NAK\n");
	return -1;
	}
	die("git upload-pack: expected SHA1 list, got '%s'", reader->line);
	}
	}

	static int is_our_ref(struct object *o, enum allow_uor allow_uor)
	{
	int allow_hidden_ref = (allow_uor &
	(ALLOW_TIP_SHA1 \| ALLOW_REACHABLE_SHA1));
	return o->flags & ((allow_hidden_ref ? HIDDEN_REF : 0) \| OUR_REF);
	}

	/*
	* on successful case, it's up to the caller to close cmd->out
	*/
	static int do_reachable_revlist(struct child_process *cmd,
	struct object_array *src,
	struct object_array *reachable,
	enum allow_uor allow_uor)
	{
	static const char *argv[] = {
	"rev-list", "--stdin", NULL,
	};
	struct object *o;
	FILE *cmd_in = NULL;
	int i;

	cmd->argv = argv;
	cmd->git_cmd = 1;
	cmd->no_stderr = 1;
	cmd->in = -1;
	cmd->out = -1;

	/*
	* If the next rev-list --stdin encounters an unknown commit,
	* it terminates, which will cause SIGPIPE in the write loop
	* below.
	*/
	sigchain_push(SIGPIPE, SIG_IGN);

	if (start_command(cmd))
	goto error;

	cmd_in = xfdopen(cmd->in, "w");

	for (i = get_max_object_index(); 0 < i; ) {
	o = get_indexed_object(--i);
	if (!o)
	continue;
	if (reachable && o->type == OBJ_COMMIT)
	o->flags &= ~TMP_MARK;
	if (!is_our_ref(o, allow_uor))
	continue;
	if (fprintf(cmd_in, "^%s\n", oid_to_hex(&o->oid)) < 0)
	goto error;
	}
	for (i = 0; i < src->nr; i++) {
	o = src->objects[i].item;
	if (is_our_ref(o, allow_uor)) {
	if (reachable)
	add_object_array(o, NULL, reachable);
	continue;
	}
	if (reachable && o->type == OBJ_COMMIT)
	o->flags \|= TMP_MARK;
	if (fprintf(cmd_in, "%s\n", oid_to_hex(&o->oid)) < 0)
	goto error;
	}
	if (ferror(cmd_in) \|\| fflush(cmd_in))
	goto error;
	fclose(cmd_in);
	cmd->in = -1;
	sigchain_pop(SIGPIPE);

	return 0;

	error:
	sigchain_pop(SIGPIPE);

	if (cmd_in)
	fclose(cmd_in);
	if (cmd->out >= 0)
	close(cmd->out);
	return -1;
	}

	static int get_reachable_list(struct upload_pack_data *data,
	struct object_array *reachable)
	{
	struct child_process cmd = CHILD_PROCESS_INIT;
	int i;
	struct object *o;
	char namebuf[GIT_MAX_HEXSZ + 2]; /* ^ + hash + LF */
	const unsigned hexsz = the_hash_algo->hexsz;

	if (do_reachable_revlist(&cmd, &data->shallows, reachable,
	data->allow_uor) < 0)
	return -1;

	while ((i = read_in_full(cmd.out, namebuf, hexsz + 1)) == hexsz + 1) {
	struct object_id oid;
	const char *p;

	if (parse_oid_hex(namebuf, &oid, &p) \|\| *p != '\n')
	break;

	o = lookup_object(the_repository, &oid);
	if (o && o->type == OBJ_COMMIT) {
	o->flags &= ~TMP_MARK;
	}
	}
	for (i = get_max_object_index(); 0 < i; i--) {
	o = get_indexed_object(i - 1);
	if (o && o->type == OBJ_COMMIT &&
	(o->flags & TMP_MARK)) {
	add_object_array(o, NULL, reachable);
	o->flags &= ~TMP_MARK;
	}
	}
	close(cmd.out);

	if (finish_command(&cmd))
	return -1;

	return 0;
	}

	static int has_unreachable(struct object_array *src, enum allow_uor allow_uor)
	{
	struct child_process cmd = CHILD_PROCESS_INIT;
	char buf[1];
	int i;

	if (do_reachable_revlist(&cmd, src, NULL, allow_uor) < 0)
	return 1;

	/*
	* The commits out of the rev-list are not ancestors of
	* our ref.
	*/
	i = read_in_full(cmd.out, buf, 1);
	if (i)
	goto error;
	close(cmd.out);
	cmd.out = -1;

	/*
	* rev-list may have died by encountering a bad commit
	* in the history, in which case we do want to bail out
	* even when it showed no commit.
	*/
	if (finish_command(&cmd))
	goto error;

	/* All the non-tip ones are ancestors of what we advertised */
	return 0;

	error:
	if (cmd.out >= 0)
	close(cmd.out);
	return 1;
	}

	static void check_non_tip(struct upload_pack_data *data)
	{
	int i;

	/*
	* In the normal in-process case without
	* uploadpack.allowReachableSHA1InWant,
	* non-tip requests can never happen.
	*/
	if (!data->stateless_rpc && !(data->allow_uor & ALLOW_REACHABLE_SHA1))
	goto error;
	if (!has_unreachable(&data->want_obj, data->allow_uor))
	/* All the non-tip ones are ancestors of what we advertised */
	return;

	error:
	/* Pick one of them (we know there at least is one) */
	for (i = 0; i < data->want_obj.nr; i++) {
	struct object *o = data->want_obj.objects[i].item;
	if (!is_our_ref(o, data->allow_uor)) {
	packet_writer_error(&data->writer,
	"upload-pack: not our ref %s",
	oid_to_hex(&o->oid));
	die("git upload-pack: not our ref %s",
	oid_to_hex(&o->oid));
	}
	}
	}

	static void send_shallow(struct upload_pack_data *data,
	struct commit_list *result)
	{
	while (result) {
	struct object *object = &result->item->object;
	if (!(object->flags & (CLIENT_SHALLOW\|NOT_SHALLOW))) {
	packet_writer_write(&data->writer, "shallow %s",
	oid_to_hex(&object->oid));
	register_shallow(the_repository, &object->oid);
	data->shallow_nr++;
	}
	result = result->next;
	}
	}

	static void send_unshallow(struct upload_pack_data *data)
	{
	int i;

	for (i = 0; i < data->shallows.nr; i++) {
	struct object *object = data->shallows.objects[i].item;
	if (object->flags & NOT_SHALLOW) {
	struct commit_list *parents;
	packet_writer_write(&data->writer, "unshallow %s",
	oid_to_hex(&object->oid));
	object->flags &= ~CLIENT_SHALLOW;
	/*
	* We want to _register_ "object" as shallow, but we
	* also need to traverse object's parents to deepen a
	* shallow clone. Unregister it for now so we can
	* parse and add the parents to the want list, then
	* re-register it.
	*/
	unregister_shallow(&object->oid);
	object->parsed = 0;
	parse_commit_or_die((struct commit *)object);
	parents = ((struct commit *)object)->parents;
	while (parents) {
	add_object_array(&parents->item->object,
	NULL, &data->want_obj);
	parents = parents->next;
	}
	add_object_array(object, NULL, &data->extra_edge_obj);
	}
	/* make sure commit traversal conforms to client */
	register_shallow(the_repository, &object->oid);
	}
	}

	static int check_ref(const char refname_full, const struct object_id oid,
	int flag, void *cb_data);
	static void deepen(struct upload_pack_data *data, int depth)
	{
	if (depth == INFINITE_DEPTH && !is_repository_shallow(the_repository)) {
	int i;

	for (i = 0; i < data->shallows.nr; i++) {
	struct object *object = data->shallows.objects[i].item;
	object->flags \|= NOT_SHALLOW;
	}
	} else if (data->deepen_relative) {
	struct object_array reachable_shallows = OBJECT_ARRAY_INIT;
	struct commit_list *result;

	/*
	* Checking for reachable shallows requires that our refs be
	* marked with OUR_REF.
	*/
	head_ref_namespaced(check_ref, NULL);
	for_each_namespaced_ref(check_ref, NULL);

	get_reachable_list(data, &reachable_shallows);
	result = get_shallow_commits(&reachable_shallows,
	depth + 1,
	SHALLOW, NOT_SHALLOW);
	send_shallow(data, result);
	free_commit_list(result);
	object_array_clear(&reachable_shallows);
	} else {
	struct commit_list *result;

	result = get_shallow_commits(&data->want_obj, depth,
	SHALLOW, NOT_SHALLOW);
	send_shallow(data, result);
	free_commit_list(result);
	}

	send_unshallow(data);
	}

	static void deepen_by_rev_list(struct upload_pack_data *data,
	int ac,
	const char **av)
	{
	struct commit_list *result;

	disable_commit_graph(the_repository);
	result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
	send_shallow(data, result);
	free_commit_list(result);
	send_unshallow(data);
	}

	/* Returns 1 if a shallow list is sent or 0 otherwise */
	static int send_shallow_list(struct upload_pack_data *data)
	{
	int ret = 0;

	if (data->depth > 0 && data->deepen_rev_list)
	die("git upload-pack: deepen and deepen-since (or deepen-not) cannot be used together");
	if (data->depth > 0) {
	deepen(data, data->depth);
	ret = 1;
	} else if (data->deepen_rev_list) {
	struct strvec av = STRVEC_INIT;
	int i;

	strvec_push(&av, "rev-list");
	if (data->deepen_since)
	strvec_pushf(&av, "--max-age=%"PRItime, data->deepen_since);
	if (data->deepen_not.nr) {
	strvec_push(&av, "--not");
	for (i = 0; i < data->deepen_not.nr; i++) {
	struct string_list_item *s = data->deepen_not.items + i;
	strvec_push(&av, s->string);
	}
	strvec_push(&av, "--not");
	}
	for (i = 0; i < data->want_obj.nr; i++) {
	struct object *o = data->want_obj.objects[i].item;
	strvec_push(&av, oid_to_hex(&o->oid));
	}
	deepen_by_rev_list(data, av.nr, av.v);
	strvec_clear(&av);
	ret = 1;
	} else {
	if (data->shallows.nr > 0) {
	int i;
	for (i = 0; i < data->shallows.nr; i++)
	register_shallow(the_repository,
	&data->shallows.objects[i].item->oid);
	}
	}

	data->shallow_nr += data->shallows.nr;
	return ret;
	}

	static int process_shallow(const char line, struct object_array shallows)
	{
	const char *arg;
	if (skip_prefix(line, "shallow ", &arg)) {
	struct object_id oid;
	struct object *object;
	if (get_oid_hex(arg, &oid))
	die("invalid shallow line: %s", line);
	object = parse_object(the_repository, &oid);
	if (!object)
	return 1;
	if (object->type != OBJ_COMMIT)
	die("invalid shallow object %s", oid_to_hex(&oid));
	if (!(object->flags & CLIENT_SHALLOW)) {
	object->flags \|= CLIENT_SHALLOW;
	add_object_array(object, NULL, shallows);
	}
	return 1;
	}

	return 0;
	}

	static int process_deepen(const char line, int depth)
	{
	const char *arg;
	if (skip_prefix(line, "deepen ", &arg)) {
	char *end = NULL;
	*depth = (int)strtol(arg, &end, 0);
	if (!end \|\| end \|\| depth <= 0)
	die("Invalid deepen: %s", line);
	return 1;
	}

	return 0;
	}

	static int process_deepen_since(const char line, timestamp_t deepen_since, int *deepen_rev_list)
	{
	const char *arg;
	if (skip_prefix(line, "deepen-since ", &arg)) {
	char *end = NULL;
	*deepen_since = parse_timestamp(arg, &end, 0);
	if (!end \|\| *end \|\| !deepen_since \|\|
	/* revisions.c's max_age -1 is special */
	*deepen_since == -1)
	die("Invalid deepen-since: %s", line);
	*deepen_rev_list = 1;
	return 1;
	}
	return 0;
	}

	static int process_deepen_not(const char line, struct string_list deepen_not, int *deepen_rev_list)
	{
	const char *arg;
	if (skip_prefix(line, "deepen-not ", &arg)) {
	char *ref = NULL;
	struct object_id oid;
	if (expand_ref(the_repository, arg, strlen(arg), &oid, &ref) != 1)
	die("git upload-pack: ambiguous deepen-not: %s", line);
	string_list_append(deepen_not, ref);
	free(ref);
	*deepen_rev_list = 1;
	return 1;
	}
	return 0;
	}

	NORETURN __attribute__((format(printf,2,3)))
	static void send_err_and_die(struct upload_pack_data *data,
	const char *fmt, ...)
	{
	struct strbuf buf = STRBUF_INIT;
	va_list ap;

	va_start(ap, fmt);
	strbuf_vaddf(&buf, fmt, ap);
	va_end(ap);

	packet_writer_error(&data->writer, "%s", buf.buf);
	die("%s", buf.buf);
	}

	static void check_one_filter(struct upload_pack_data *data,
	struct list_objects_filter_options *opts)
	{
	const char *key = list_object_filter_config_name(opts->choice);
	struct string_list_item *item = string_list_lookup(&data->allowed_filters,
	key);
	int allowed;

	if (item)
	allowed = (intptr_t)item->util;
	else
	allowed = data->allow_filter_fallback;

	if (!allowed)
	send_err_and_die(data, "filter '%s' not supported", key);

	if (opts->choice == LOFC_TREE_DEPTH &&
	opts->tree_exclude_depth > data->tree_filter_max_depth)
	send_err_and_die(data,
	"tree filter allows max depth %lu, but got %lu",
	data->tree_filter_max_depth,
	opts->tree_exclude_depth);
	}

	static void check_filter_recurse(struct upload_pack_data *data,
	struct list_objects_filter_options *opts)
	{
	size_t i;

	check_one_filter(data, opts);
	if (opts->choice != LOFC_COMBINE)
	return;

	for (i = 0; i < opts->sub_nr; i++)
	check_filter_recurse(data, &opts->sub[i]);
	}

	static void die_if_using_banned_filter(struct upload_pack_data *data)
	{
	check_filter_recurse(data, &data->filter_options);
	}

	static void receive_needs(struct upload_pack_data *data,
	struct packet_reader *reader)
	{
	int has_non_tip = 0;

	data->shallow_nr = 0;
	for (;;) {
	struct object *o;
	const char *features;
	struct object_id oid_buf;
	const char *arg;
	int feature_len;

	reset_timeout(data->timeout);
	if (packet_reader_read(reader) != PACKET_READ_NORMAL)
	break;

	if (process_shallow(reader->line, &data->shallows))
	continue;
	if (process_deepen(reader->line, &data->depth))
	continue;
	if (process_deepen_since(reader->line, &data->deepen_since, &data->deepen_rev_list))
	continue;
	if (process_deepen_not(reader->line, &data->deepen_not, &data->deepen_rev_list))
	continue;

	if (skip_prefix(reader->line, "filter ", &arg)) {
	if (!data->filter_capability_requested)
	die("git upload-pack: filtering capability not negotiated");
	list_objects_filter_die_if_populated(&data->filter_options);
	parse_list_objects_filter(&data->filter_options, arg);
	die_if_using_banned_filter(data);
	continue;
	}

	if (!skip_prefix(reader->line, "want ", &arg) \|\|
	parse_oid_hex(arg, &oid_buf, &features))
	die("git upload-pack: protocol error, "
	"expected to get object ID, not '%s'", reader->line);

	if (parse_feature_request(features, "deepen-relative"))
	data->deepen_relative = 1;
	if (parse_feature_request(features, "multi_ack_detailed"))
	data->multi_ack = MULTI_ACK_DETAILED;
	else if (parse_feature_request(features, "multi_ack"))
	data->multi_ack = MULTI_ACK;
	if (parse_feature_request(features, "no-done"))
	data->no_done = 1;
	if (parse_feature_request(features, "thin-pack"))
	data->use_thin_pack = 1;
	if (parse_feature_request(features, "ofs-delta"))
	data->use_ofs_delta = 1;
	if (parse_feature_request(features, "side-band-64k"))
	data->use_sideband = LARGE_PACKET_MAX;
	else if (parse_feature_request(features, "side-band"))
	data->use_sideband = DEFAULT_PACKET_MAX;
	if (parse_feature_request(features, "no-progress"))
	data->no_progress = 1;
	if (parse_feature_request(features, "include-tag"))
	data->use_include_tag = 1;
	if (data->allow_filter &&
	parse_feature_request(features, "filter"))
	data->filter_capability_requested = 1;

	arg = parse_feature_value(features, "session-id", &feature_len, NULL);
	if (arg) {
	char *client_sid = xstrndup(arg, feature_len);
	trace2_data_string("transfer", NULL, "client-sid", client_sid);
	free(client_sid);
	}

	o = parse_object(the_repository, &oid_buf);
	if (!o) {
	packet_writer_error(&data->writer,
	"upload-pack: not our ref %s",
	oid_to_hex(&oid_buf));
	die("git upload-pack: not our ref %s",
	oid_to_hex(&oid_buf));
	}
	if (!(o->flags & WANTED)) {
	o->flags \|= WANTED;
	if (!((data->allow_uor & ALLOW_ANY_SHA1) == ALLOW_ANY_SHA1
	\|\| is_our_ref(o, data->allow_uor)))
	has_non_tip = 1;
	add_object_array(o, NULL, &data->want_obj);
	}
	}

	/*
	* We have sent all our refs already, and the other end
	* should have chosen out of them. When we are operating
	* in the stateless RPC mode, however, their choice may
	* have been based on the set of older refs advertised
	* by another process that handled the initial request.
	*/
	if (has_non_tip)
	check_non_tip(data);

	if (!data->use_sideband && data->daemon_mode)
	data->no_progress = 1;

	if (data->depth == 0 && !data->deepen_rev_list && data->shallows.nr == 0)
	return;

	if (send_shallow_list(data))
	packet_flush(1);
	}

	/* return non-zero if the ref is hidden, otherwise 0 */
	static int mark_our_ref(const char refname, const char refname_full,
	const struct object_id *oid)
	{
	struct object *o = lookup_unknown_object(the_repository, oid);

	if (ref_is_hidden(refname, refname_full)) {
	o->flags \|= HIDDEN_REF;
	return 1;
	}
	o->flags \|= OUR_REF;
	return 0;
	}

	static int check_ref(const char refname_full, const struct object_id oid,
	int flag, void *cb_data)
	{
	const char *refname = strip_namespace(refname_full);

	mark_our_ref(refname, refname_full, oid);
	return 0;
	}

	static void format_symref_info(struct strbuf buf, struct string_list symref)
	{
	struct string_list_item *item;

	if (!symref->nr)
	return;
	for_each_string_list_item(item, symref)
	strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
	}

	static void format_session_id(struct strbuf buf, struct upload_pack_data d) {
	if (d->advertise_sid)
	strbuf_addf(buf, " session-id=%s", trace2_session_id());
	}

	static int send_ref(const char refname, const struct object_id oid,
	int flag, void *cb_data)
	{
	static const char *capabilities = "multi_ack thin-pack side-band"
	" side-band-64k ofs-delta shallow deepen-since deepen-not"
	" deepen-relative no-progress include-tag multi_ack_detailed";
	const char *refname_nons = strip_namespace(refname);
	struct object_id peeled;
	struct upload_pack_data *data = cb_data;

	if (mark_our_ref(refname_nons, refname, oid))
	return 0;

	if (capabilities) {
	struct strbuf symref_info = STRBUF_INIT;
	struct strbuf session_id = STRBUF_INIT;

	format_symref_info(&symref_info, &data->symref);
	format_session_id(&session_id, data);
	packet_write_fmt(1, "%s %s%c%s%s%s%s%s%s%s object-format=%s agent=%s\n",
	oid_to_hex(oid), refname_nons,
	0, capabilities,
	(data->allow_uor & ALLOW_TIP_SHA1) ?
	" allow-tip-sha1-in-want" : "",
	(data->allow_uor & ALLOW_REACHABLE_SHA1) ?
	" allow-reachable-sha1-in-want" : "",
	data->stateless_rpc ? " no-done" : "",
	symref_info.buf,
	data->allow_filter ? " filter" : "",
	session_id.buf,
	the_hash_algo->name,
	git_user_agent_sanitized());
	strbuf_release(&symref_info);
	strbuf_release(&session_id);
	} else {
	packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), refname_nons);
	}
	capabilities = NULL;
	if (!peel_iterated_oid(oid, &peeled))
	packet_write_fmt(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
	return 0;
	}

	static int find_symref(const char refname, const struct object_id oid,
	int flag, void *cb_data)
	{
	const char *symref_target;
	struct string_list_item *item;

	if ((flag & REF_ISSYMREF) == 0)
	return 0;
	symref_target = resolve_ref_unsafe(refname, 0, NULL, &flag);
	if (!symref_target \|\| (flag & REF_ISSYMREF) == 0)
	die("'%s' is a symref but it is not?", refname);
	item = string_list_append(cb_data, strip_namespace(refname));
	item->util = xstrdup(strip_namespace(symref_target));
	return 0;
	}

	static int parse_object_filter_config(const char var, const char value,
	struct upload_pack_data *data)
	{
	struct strbuf buf = STRBUF_INIT;
	const char sub, key;
	size_t sub_len;

	if (parse_config_key(var, "uploadpackfilter", &sub, &sub_len, &key))
	return 0;

	if (!sub) {
	if (!strcmp(key, "allow"))
	data->allow_filter_fallback = git_config_bool(var, value);
	return 0;
	}

	strbuf_add(&buf, sub, sub_len);

	if (!strcmp(key, "allow"))
	string_list_insert(&data->allowed_filters, buf.buf)->util =
	(void *)(intptr_t)git_config_bool(var, value);
	else if (!strcmp(buf.buf, "tree") && !strcmp(key, "maxdepth")) {
	if (!value) {
	strbuf_release(&buf);
	return config_error_nonbool(var);
	}
	string_list_insert(&data->allowed_filters, buf.buf)->util =
	(void *)(intptr_t)1;
	data->tree_filter_max_depth = git_config_ulong(var, value);
	}

	strbuf_release(&buf);
	return 0;
	}

	static int upload_pack_config(const char var, const char value, void *cb_data)
	{
	struct upload_pack_data *data = cb_data;

	if (!strcmp("uploadpack.allowtipsha1inwant", var)) {
	if (git_config_bool(var, value))
	data->allow_uor \|= ALLOW_TIP_SHA1;
	else
	data->allow_uor &= ~ALLOW_TIP_SHA1;
	} else if (!strcmp("uploadpack.allowreachablesha1inwant", var)) {
	if (git_config_bool(var, value))
	data->allow_uor \|= ALLOW_REACHABLE_SHA1;
	else
	data->allow_uor &= ~ALLOW_REACHABLE_SHA1;
	} else if (!strcmp("uploadpack.allowanysha1inwant", var)) {
	if (git_config_bool(var, value))
	data->allow_uor \|= ALLOW_ANY_SHA1;
	else
	data->allow_uor &= ~ALLOW_ANY_SHA1;
	} else if (!strcmp("uploadpack.keepalive", var)) {
	data->keepalive = git_config_int(var, value);
	if (!data->keepalive)
	data->keepalive = -1;
	} else if (!strcmp("uploadpack.allowfilter", var)) {
	data->allow_filter = git_config_bool(var, value);
	} else if (!strcmp("uploadpack.allowrefinwant", var)) {
	data->allow_ref_in_want = git_config_bool(var, value);
	} else if (!strcmp("uploadpack.allowsidebandall", var)) {
	data->allow_sideband_all = git_config_bool(var, value);
	} else if (!strcmp("core.precomposeunicode", var)) {
	precomposed_unicode = git_config_bool(var, value);
	} else if (!strcmp("transfer.advertisesid", var)) {
	data->advertise_sid = git_config_bool(var, value);
	}

	if (current_config_scope() != CONFIG_SCOPE_LOCAL &&
	current_config_scope() != CONFIG_SCOPE_WORKTREE) {
	if (!strcmp("uploadpack.packobjectshook", var))
	return git_config_string(&data->pack_objects_hook, var, value);
	}

	if (parse_object_filter_config(var, value, data) < 0)
	return -1;

	return parse_hide_refs_config(var, value, "uploadpack");
	}

	void upload_pack(struct upload_pack_options *options)
	{
	struct packet_reader reader;
	struct upload_pack_data data;

	upload_pack_data_init(&data);

	git_config(upload_pack_config, &data);

	data.stateless_rpc = options->stateless_rpc;
	data.daemon_mode = options->daemon_mode;
	data.timeout = options->timeout;

	head_ref_namespaced(find_symref, &data.symref);

	if (options->advertise_refs \|\| !data.stateless_rpc) {
	reset_timeout(data.timeout);
	head_ref_namespaced(send_ref, &data);
	for_each_namespaced_ref(send_ref, &data);
	advertise_shallow_grafts(1);
	packet_flush(1);
	} else {
	head_ref_namespaced(check_ref, NULL);
	for_each_namespaced_ref(check_ref, NULL);
	}

	if (!options->advertise_refs) {
	packet_reader_init(&reader, 0, NULL, 0,
	PACKET_READ_CHOMP_NEWLINE \|
	PACKET_READ_DIE_ON_ERR_PACKET);

	receive_needs(&data, &reader);

	/*
	* An EOF at this exact point in negotiation should be
	* acceptable from stateless clients as they will consume the
	* shallow list before doing subsequent rpc with haves/etc.
	*/
	if (data.stateless_rpc)
	reader.options \|= PACKET_READ_GENTLE_ON_EOF;

	if (data.want_obj.nr &&
	packet_reader_peek(&reader) != PACKET_READ_EOF) {
	reader.options &= ~PACKET_READ_GENTLE_ON_EOF;
	get_common_commits(&data, &reader);
	create_pack_file(&data, NULL);
	}
	}

	upload_pack_data_clear(&data);
	}

	static int parse_want(struct packet_writer writer, const char line,
	struct object_array *want_obj)
	{
	const char *arg;
	if (skip_prefix(line, "want ", &arg)) {
	struct object_id oid;
	struct object *o;

	if (get_oid_hex(arg, &oid))
	die("git upload-pack: protocol error, "
	"expected to get oid, not '%s'", line);

	o = parse_object(the_repository, &oid);
	if (!o) {
	packet_writer_error(writer,
	"upload-pack: not our ref %s",
	oid_to_hex(&oid));
	die("git upload-pack: not our ref %s",
	oid_to_hex(&oid));
	}

	if (!(o->flags & WANTED)) {
	o->flags \|= WANTED;
	add_object_array(o, NULL, want_obj);
	}

	return 1;
	}

	return 0;
	}

	static int parse_want_ref(struct packet_writer writer, const char line,
	struct string_list *wanted_refs,
	struct object_array *want_obj)
	{
	const char *arg;
	if (skip_prefix(line, "want-ref ", &arg)) {
	struct object_id oid;
	struct string_list_item *item;
	struct object *o;

	if (read_ref(arg, &oid)) {
	packet_writer_error(writer, "unknown ref %s", arg);
	die("unknown ref %s", arg);
	}

	item = string_list_append(wanted_refs, arg);
	item->util = oiddup(&oid);

	o = parse_object_or_die(&oid, arg);
	if (!(o->flags & WANTED)) {
	o->flags \|= WANTED;
	add_object_array(o, NULL, want_obj);
	}

	return 1;
	}

	return 0;
	}

	static int parse_have(const char line, struct oid_array haves)
	{
	const char *arg;
	if (skip_prefix(line, "have ", &arg)) {
	struct object_id oid;

	if (get_oid_hex(arg, &oid))
	die("git upload-pack: expected SHA1 object, got '%s'", arg);
	oid_array_append(haves, &oid);
	return 1;
	}

	return 0;
	}

	static void process_args(struct packet_reader *request,
	struct upload_pack_data *data)
	{
	while (packet_reader_read(request) == PACKET_READ_NORMAL) {
	const char *arg = request->line;
	const char *p;

	/* process want */
	if (parse_want(&data->writer, arg, &data->want_obj))
	continue;
	if (data->allow_ref_in_want &&
	parse_want_ref(&data->writer, arg, &data->wanted_refs,
	&data->want_obj))
	continue;
	/* process have line */
	if (parse_have(arg, &data->haves))
	continue;

	/* process args like thin-pack */
	if (!strcmp(arg, "thin-pack")) {
	data->use_thin_pack = 1;
	continue;
	}
	if (!strcmp(arg, "ofs-delta")) {
	data->use_ofs_delta = 1;
	continue;
	}
	if (!strcmp(arg, "no-progress")) {
	data->no_progress = 1;
	continue;
	}
	if (!strcmp(arg, "include-tag")) {
	data->use_include_tag = 1;
	continue;
	}
	if (!strcmp(arg, "done")) {
	data->done = 1;
	continue;
	}
	if (!strcmp(arg, "wait-for-done")) {
	data->wait_for_done = 1;
	continue;
	}

	/* Shallow related arguments */
	if (process_shallow(arg, &data->shallows))
	continue;
	if (process_deepen(arg, &data->depth))
	continue;
	if (process_deepen_since(arg, &data->deepen_since,
	&data->deepen_rev_list))
	continue;
	if (process_deepen_not(arg, &data->deepen_not,
	&data->deepen_rev_list))
	continue;
	if (!strcmp(arg, "deepen-relative")) {
	data->deepen_relative = 1;
	continue;
	}

	if (data->allow_filter && skip_prefix(arg, "filter ", &p)) {
	list_objects_filter_die_if_populated(&data->filter_options);
	parse_list_objects_filter(&data->filter_options, p);
	die_if_using_banned_filter(data);
	continue;
	}

	if ((git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) \|\|
	data->allow_sideband_all) &&
	!strcmp(arg, "sideband-all")) {
	data->writer.use_sideband = 1;
	continue;
	}

	if (skip_prefix(arg, "packfile-uris ", &p)) {
	string_list_split(&data->uri_protocols, p, ',', -1);
	continue;
	}

	/* ignore unknown lines maybe? */
	die("unexpected line: '%s'", arg);
	}

	if (data->uri_protocols.nr && !data->writer.use_sideband)
	string_list_clear(&data->uri_protocols, 0);

	if (request->status != PACKET_READ_FLUSH)
	die(_("expected flush after fetch arguments"));
	}

	static int process_haves(struct upload_pack_data data, struct oid_array common)
	{
	int i;

	/* Process haves */
	for (i = 0; i < data->haves.nr; i++) {
	const struct object_id *oid = &data->haves.oid[i];

	if (!has_object_file_with_flags(oid,
	OBJECT_INFO_QUICK \| OBJECT_INFO_SKIP_FETCH_OBJECT))
	continue;

	oid_array_append(common, oid);

	do_got_oid(data, oid);
	}

	return 0;
	}

	static int send_acks(struct upload_pack_data data, struct oid_array acks)
	{
	int i;

	packet_writer_write(&data->writer, "acknowledgments\n");

	/* Send Acks */
	if (!acks->nr)
	packet_writer_write(&data->writer, "NAK\n");

	for (i = 0; i < acks->nr; i++) {
	packet_writer_write(&data->writer, "ACK %s\n",
	oid_to_hex(&acks->oid[i]));
	}

	if (!data->wait_for_done && ok_to_give_up(data)) {
	/* Send Ready */
	packet_writer_write(&data->writer, "ready\n");
	return 1;
	}

	return 0;
	}

	static int process_haves_and_send_acks(struct upload_pack_data *data)
	{
	struct oid_array common = OID_ARRAY_INIT;
	int ret = 0;

	process_haves(data, &common);
	if (data->done) {
	ret = 1;
	} else if (send_acks(data, &common)) {
	packet_writer_delim(&data->writer);
	ret = 1;
	} else {
	/* Add Flush */
	packet_writer_flush(&data->writer);
	ret = 0;
	}

	oid_array_clear(&data->haves);
	oid_array_clear(&common);
	return ret;
	}

	static void send_wanted_ref_info(struct upload_pack_data *data)
	{
	const struct string_list_item *item;

	if (!data->wanted_refs.nr)
	return;

	packet_writer_write(&data->writer, "wanted-refs\n");

	for_each_string_list_item(item, &data->wanted_refs) {
	packet_writer_write(&data->writer, "%s %s\n",
	oid_to_hex(item->util),
	item->string);
	}

	packet_writer_delim(&data->writer);
	}

	static void send_shallow_info(struct upload_pack_data *data)
	{
	/* No shallow info needs to be sent */
	if (!data->depth && !data->deepen_rev_list && !data->shallows.nr &&
	!is_repository_shallow(the_repository))
	return;

	packet_writer_write(&data->writer, "shallow-info\n");

	if (!send_shallow_list(data) &&
	is_repository_shallow(the_repository))
	deepen(data, INFINITE_DEPTH);

	packet_delim(1);
	}

	enum fetch_state {
	FETCH_PROCESS_ARGS = 0,
	FETCH_SEND_ACKS,
	FETCH_SEND_PACK,
	FETCH_DONE,
	};

	int upload_pack_v2(struct repository r, struct strvec keys,
	struct packet_reader *request)
	{
	enum fetch_state state = FETCH_PROCESS_ARGS;
	struct upload_pack_data data;

	clear_object_flags(ALL_FLAGS);

	upload_pack_data_init(&data);
	data.use_sideband = LARGE_PACKET_MAX;

	git_config(upload_pack_config, &data);

	while (state != FETCH_DONE) {
	switch (state) {
	case FETCH_PROCESS_ARGS:
	process_args(request, &data);

	if (!data.want_obj.nr && !data.wait_for_done) {
	/*
	* Request didn't contain any 'want' lines (and
	* the request does not contain
	* "wait-for-done", in which it is reasonable
	* to just send 'have's without 'want's); guess
	* they didn't want anything.
	*/
	state = FETCH_DONE;
	} else if (data.haves.nr) {
	/*
	* Request had 'have' lines, so lets ACK them.
	*/
	state = FETCH_SEND_ACKS;
	} else {
	/*
	* Request had 'want's but no 'have's so we can
	* immedietly go to construct and send a pack.
	*/
	state = FETCH_SEND_PACK;
	}
	break;
	case FETCH_SEND_ACKS:
	if (process_haves_and_send_acks(&data))
	state = FETCH_SEND_PACK;
	else
	state = FETCH_DONE;
	break;
	case FETCH_SEND_PACK:
	send_wanted_ref_info(&data);
	send_shallow_info(&data);

	if (data.uri_protocols.nr) {
	create_pack_file(&data, &data.uri_protocols);
	} else {
	packet_writer_write(&data.writer, "packfile\n");
	create_pack_file(&data, NULL);
	}
	state = FETCH_DONE;
	break;
	case FETCH_DONE:
	continue;
	}
	}

	upload_pack_data_clear(&data);
	return 0;
	}

	int upload_pack_advertise(struct repository *r,
	struct strbuf *value)
	{
	if (value) {
	int allow_filter_value;
	int allow_ref_in_want;
	int allow_sideband_all_value;
	char *str = NULL;

	strbuf_addstr(value, "shallow wait-for-done");

	if (!repo_config_get_bool(the_repository,
	"uploadpack.allowfilter",
	&allow_filter_value) &&
	allow_filter_value)
	strbuf_addstr(value, " filter");

	if (!repo_config_get_bool(the_repository,
	"uploadpack.allowrefinwant",
	&allow_ref_in_want) &&
	allow_ref_in_want)
	strbuf_addstr(value, " ref-in-want");

	if (git_env_bool("GIT_TEST_SIDEBAND_ALL", 0) \|\|
	(!repo_config_get_bool(the_repository,
	"uploadpack.allowsidebandall",
	&allow_sideband_all_value) &&
	allow_sideband_all_value))
	strbuf_addstr(value, " sideband-all");

	if (!repo_config_get_string(the_repository,
	"uploadpack.blobpackfileuri",
	&str) &&
	str) {
	strbuf_addstr(value, " packfile-uris");
	free(str);
	}
	}

	return 1;
	}

Jun	JUL	Aug
	18
2020	2021	2022

git / git

git/upload-pack.c