receive-pack.c · leroysheep/CrazyWebTemps

bisect jch maint master next seen test todo

c 2,755 lines 70.8 KB

Raw

1	#define USE_THE_REPOSITORY_VARIABLE
2	#define DISABLE_SIGN_COMPARE_WARNINGS
3
4	#include "builtin.h"
5	#include "abspath.h"
6	#include "commit.h"
7	#include "commit-reach.h"
8	#include "config.h"
9	#include "connect.h"
10	#include "connected.h"
11	#include "environment.h"
12	#include "exec-cmd.h"
13	#include "fsck.h"
14	#include "gettext.h"
15	#include "gpg-interface.h"
16	#include "hex.h"
17	#include "hook.h"
18	#include "lockfile.h"
19	#include "object.h"
20	#include "object-file.h"
21	#include "object-name.h"
22	#include "odb.h"
23	#include "oid-array.h"
24	#include "oidset.h"
25	#include "pack.h"
26	#include "packfile.h"
27	#include "parse-options.h"
28	#include "pkt-line.h"
29	#include "protocol.h"
30	#include "refs.h"
31	#include "remote.h"
32	#include "run-command.h"
33	#include "server-info.h"
34	#include "setup.h"
35	#include "shallow.h"
36	#include "sideband.h"
37	#include "sigchain.h"
38	#include "string-list.h"
39	#include "strvec.h"
40	#include "trace.h"
41	#include "trace2.h"
42	#include "version.h"
43	#include "worktree.h"
44
45	static const char * const receive_pack_usage[] = {
46	N_("git receive-pack <git-dir>"),
47	NULL
48	};
49
50	enum deny_action {
51	DENY_UNCONFIGURED,
52	DENY_IGNORE,
53	DENY_WARN,
54	DENY_REFUSE,
55	DENY_UPDATE_INSTEAD
56	};
57
58	static int deny_deletes;
59	static int deny_non_fast_forwards;
60	static enum deny_action deny_current_branch = DENY_UNCONFIGURED;
61	static enum deny_action deny_delete_current = DENY_UNCONFIGURED;
62	static int receive_fsck_objects = -1;
63	static int transfer_fsck_objects = -1;
64	static struct strbuf fsck_msg_types = STRBUF_INIT;
65	static int receive_unpack_limit = -1;
66	static int transfer_unpack_limit = -1;
67	static int advertise_atomic_push = 1;
68	static int advertise_push_options;
69	static int advertise_sid;
70	static int unpack_limit = 100;
71	static off_t max_input_size;
72	static int report_status;
73	static int report_status_v2;
74	static int use_sideband;
75	static int use_atomic;
76	static int use_push_options;
77	static int quiet;
78	static int prefer_ofs_delta = 1;
79	static int auto_update_server_info;
80	static int auto_gc = 1;
81	static int reject_thin;
82	static int skip_connectivity_check;
83	static int stateless_rpc;
84	static const char *service_dir;
85	static const char *head_name;
86	static void *head_name_to_free;
87	static int sent_capabilities;
88	static int shallow_update;
89	static const char *alt_shallow_file;
90	static struct strbuf push_cert = STRBUF_INIT;
91	static struct object_id push_cert_oid;
92	static struct signature_check sigcheck;
93	static const char *push_cert_nonce;
94	static char *cert_nonce_seed;
95	static struct strvec hidden_refs = STRVEC_INIT;
96
97	static const char *NONCE_UNSOLICITED = "UNSOLICITED";
98	static const char *NONCE_BAD = "BAD";
99	static const char *NONCE_MISSING = "MISSING";
100	static const char *NONCE_OK = "OK";
101	static const char *NONCE_SLOP = "SLOP";
102	static const char *nonce_status;
103	static long nonce_stamp_slop;
104	static timestamp_t nonce_stamp_slop_limit;
105	static struct ref_transaction *transaction;
106
107	static enum {
108	KEEPALIVE_NEVER = 0,
109	KEEPALIVE_AFTER_NUL,
110	KEEPALIVE_ALWAYS
111	} use_keepalive;
112	static int keepalive_in_sec = 5;
113
114	static struct proc_receive_ref {
115	unsigned int want_add:1,
116	want_delete:1,
117	want_modify:1,
118	negative_ref:1;
119	char *ref_prefix;
120	struct proc_receive_ref *next;
121	} *proc_receive_ref;
122
123	static void proc_receive_ref_append(const char *prefix);
124
125	static enum deny_action parse_deny_action(const char var, const char value)
126	{
127	if (value) {
128	if (!strcasecmp(value, "ignore"))
129	return DENY_IGNORE;
130	if (!strcasecmp(value, "warn"))
131	return DENY_WARN;
132	if (!strcasecmp(value, "refuse"))
133	return DENY_REFUSE;
134	if (!strcasecmp(value, "updateinstead"))
135	return DENY_UPDATE_INSTEAD;
136	}
137	if (git_config_bool(var, value))
138	return DENY_REFUSE;
139	return DENY_IGNORE;
140	}
141
142	static int receive_pack_config(const char var, const char value,
143	const struct config_context ctx, void cb)
144	{
145	const char *msg_id;
146	int status = parse_hide_refs_config(var, value, "receive", &hidden_refs);
147
148	if (status)
149	return status;
150
151	if (strcmp(var, "receive.denydeletes") == 0) {
152	deny_deletes = git_config_bool(var, value);
153	return 0;
154	}
155
156	if (strcmp(var, "receive.denynonfastforwards") == 0) {
157	deny_non_fast_forwards = git_config_bool(var, value);
158	return 0;
159	}
160
161	if (strcmp(var, "receive.unpacklimit") == 0) {
162	receive_unpack_limit = git_config_int(var, value, ctx->kvi);
163	return 0;
164	}
165
166	if (strcmp(var, "transfer.unpacklimit") == 0) {
167	transfer_unpack_limit = git_config_int(var, value, ctx->kvi);
168	return 0;
169	}
170
171	if (strcmp(var, "receive.fsck.skiplist") == 0) {
172	char *path;
173
174	if (git_config_pathname(&path, var, value))
175	return -1;
176	if (path)
177	strbuf_addf(&fsck_msg_types, "%cskiplist=%s",
178	fsck_msg_types.len ? ',' : '=', path);
179	free(path);
180	return 0;
181	}
182
183	if (skip_prefix(var, "receive.fsck.", &msg_id)) {
184	if (!value)
185	return config_error_nonbool(var);
186	if (is_valid_msg_type(msg_id, value))
187	strbuf_addf(&fsck_msg_types, "%c%s=%s",
188	fsck_msg_types.len ? ',' : '=', msg_id, value);
189	else
190	warning("skipping unknown msg id '%s'", msg_id);
191	return 0;
192	}
193
194	if (strcmp(var, "receive.fsckobjects") == 0) {
195	receive_fsck_objects = git_config_bool(var, value);
196	return 0;
197	}
198
199	if (strcmp(var, "transfer.fsckobjects") == 0) {
200	transfer_fsck_objects = git_config_bool(var, value);
201	return 0;
202	}
203
204	if (!strcmp(var, "receive.denycurrentbranch")) {
205	deny_current_branch = parse_deny_action(var, value);
206	return 0;
207	}
208
209	if (strcmp(var, "receive.denydeletecurrent") == 0) {
210	deny_delete_current = parse_deny_action(var, value);
211	return 0;
212	}
213
214	if (strcmp(var, "repack.usedeltabaseoffset") == 0) {
215	prefer_ofs_delta = git_config_bool(var, value);
216	return 0;
217	}
218
219	if (strcmp(var, "receive.updateserverinfo") == 0) {
220	auto_update_server_info = git_config_bool(var, value);
221	return 0;
222	}
223
224	if (strcmp(var, "receive.autogc") == 0) {
225	auto_gc = git_config_bool(var, value);
226	return 0;
227	}
228
229	if (strcmp(var, "receive.shallowupdate") == 0) {
230	shallow_update = git_config_bool(var, value);
231	return 0;
232	}
233
234	if (strcmp(var, "receive.certnonceseed") == 0)
235	return git_config_string(&cert_nonce_seed, var, value);
236
237	if (strcmp(var, "receive.certnonceslop") == 0) {
238	nonce_stamp_slop_limit = git_config_ulong(var, value, ctx->kvi);
239	return 0;
240	}
241
242	if (strcmp(var, "receive.advertiseatomic") == 0) {
243	advertise_atomic_push = git_config_bool(var, value);
244	return 0;
245	}
246
247	if (strcmp(var, "receive.advertisepushoptions") == 0) {
248	advertise_push_options = git_config_bool(var, value);
249	return 0;
250	}
251
252	if (strcmp(var, "receive.keepalive") == 0) {
253	keepalive_in_sec = git_config_int(var, value, ctx->kvi);
254	return 0;
255	}
256
257	if (strcmp(var, "receive.maxinputsize") == 0) {
258	max_input_size = git_config_int64(var, value, ctx->kvi);
259	return 0;
260	}
261
262	if (strcmp(var, "receive.procreceiverefs") == 0) {
263	if (!value)
264	return config_error_nonbool(var);
265	proc_receive_ref_append(value);
266	return 0;
267	}
268
269	if (strcmp(var, "transfer.advertisesid") == 0) {
270	advertise_sid = git_config_bool(var, value);
271	return 0;
272	}
273
274	return git_default_config(var, value, ctx, cb);
275	}
276
277	static void show_ref(const char path, const struct object_id oid)
278	{
279	if (sent_capabilities) {
280	packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), path);
281	} else {
282	struct strbuf cap = STRBUF_INIT;
283
284	strbuf_addstr(&cap,
285	"report-status report-status-v2 delete-refs side-band-64k quiet");
286	if (advertise_atomic_push)
287	strbuf_addstr(&cap, " atomic");
288	if (prefer_ofs_delta)
289	strbuf_addstr(&cap, " ofs-delta");
290	if (push_cert_nonce)
291	strbuf_addf(&cap, " push-cert=%s", push_cert_nonce);
292	if (advertise_push_options)
293	strbuf_addstr(&cap, " push-options");
294	if (advertise_sid)
295	strbuf_addf(&cap, " session-id=%s", trace2_session_id());
296	strbuf_addf(&cap, " object-format=%s", the_hash_algo->name);
297	strbuf_addf(&cap, " agent=%s", git_user_agent_sanitized());
298	packet_write_fmt(1, "%s %s%c%s\n",
299	oid_to_hex(oid), path, 0, cap.buf);
300	strbuf_release(&cap);
301	sent_capabilities = 1;
302	}
303	}
304
305	static int show_ref_cb(const struct reference ref, void data)
306	{
307	struct oidset *seen = data;
308	const char *path = strip_namespace(ref->name);
309
310	if (ref_is_hidden(path, ref->name, &hidden_refs))
311	return 0;
312
313	/*
314	* Advertise refs outside our current namespace as ".have"
315	* refs, so that the client can use them to minimize data
316	* transfer but will otherwise ignore them.
317	*/
318	if (!path) {
319	if (oidset_insert(seen, ref->oid))
320	return 0;
321	path = ".have";
322	} else {
323	oidset_insert(seen, ref->oid);
324	}
325	show_ref(path, ref->oid);
326	return 0;
327	}
328
329	static void show_one_alternate_ref(const struct object_id *oid,
330	void *data)
331	{
332	struct oidset *seen = data;
333
334	if (oidset_insert(seen, oid))
335	return;
336
337	show_ref(".have", oid);
338	}
339
340	static void write_head_info(void)
341	{
342	struct refs_for_each_ref_options opts = { 0 };
343	static struct oidset seen = OIDSET_INIT;
344	struct strvec excludes_vector = STRVEC_INIT;
345
346	/*
347	* We need access to the reference names both with and without their
348	* namespace and thus cannot use `refs_for_each_namespaced_ref()`. We
349	* thus have to adapt exclude patterns to carry the namespace prefix
350	* ourselves.
351	*/
352	opts.exclude_patterns = get_namespaced_exclude_patterns(
353	hidden_refs_to_excludes(&hidden_refs),
354	get_git_namespace(), &excludes_vector);
355
356	refs_for_each_ref_ext(get_main_ref_store(the_repository),
357	show_ref_cb, &seen, &opts);
358	odb_for_each_alternate_ref(the_repository->objects,
359	show_one_alternate_ref, &seen);
360
361	oidset_clear(&seen);
362	strvec_clear(&excludes_vector);
363
364	if (!sent_capabilities)
365	show_ref("capabilities^{}", null_oid(the_hash_algo));
366
367	advertise_shallow_grafts(1);
368
369	/* EOF */
370	packet_flush(1);
371	}
372
373	#define RUN_PROC_RECEIVE_SCHEDULED 1
374	#define RUN_PROC_RECEIVE_RETURNED 2
375	struct command {
376	struct command *next;
377	const char *error_string;
378	char *error_string_owned;
379	struct ref_push_report *report;
380	unsigned int skip_update:1,
381	did_not_exist:1,
382	run_proc_receive:2;
383	int index;
384	struct object_id old_oid;
385	struct object_id new_oid;
386	char ref_name[FLEX_ARRAY]; /* more */
387	};
388
389	static void proc_receive_ref_append(const char *prefix)
390	{
391	struct proc_receive_ref *ref_pattern;
392	const char *p;
393	int len;
394
395	CALLOC_ARRAY(ref_pattern, 1);
396	p = strchr(prefix, ':');
397	if (p) {
398	while (prefix < p) {
399	if (*prefix == 'a')
400	ref_pattern->want_add = 1;
401	else if (*prefix == 'd')
402	ref_pattern->want_delete = 1;
403	else if (*prefix == 'm')
404	ref_pattern->want_modify = 1;
405	else if (*prefix == '!')
406	ref_pattern->negative_ref = 1;
407	prefix++;
408	}
409	prefix++;
410	} else {
411	ref_pattern->want_add = 1;
412	ref_pattern->want_delete = 1;
413	ref_pattern->want_modify = 1;
414	}
415	len = strlen(prefix);
416	while (len && prefix[len - 1] == '/')
417	len--;
418	ref_pattern->ref_prefix = xmemdupz(prefix, len);
419	if (!proc_receive_ref) {
420	proc_receive_ref = ref_pattern;
421	} else {
422	struct proc_receive_ref *end;
423
424	end = proc_receive_ref;
425	while (end->next)
426	end = end->next;
427	end->next = ref_pattern;
428	}
429	}
430
431	static int proc_receive_ref_matches(struct command *cmd)
432	{
433	struct proc_receive_ref *p;
434
435	if (!proc_receive_ref)
436	return 0;
437
438	for (p = proc_receive_ref; p; p = p->next) {
439	const char *match = p->ref_prefix;
440	const char *remains;
441
442	if (!p->want_add && is_null_oid(&cmd->old_oid))
443	continue;
444	else if (!p->want_delete && is_null_oid(&cmd->new_oid))
445	continue;
446	else if (!p->want_modify &&
447	!is_null_oid(&cmd->old_oid) &&
448	!is_null_oid(&cmd->new_oid))
449	continue;
450
451	if (skip_prefix(cmd->ref_name, match, &remains) &&
452	(!remains \|\| remains == '/')) {
453	if (!p->negative_ref)
454	return 1;
455	} else if (p->negative_ref) {
456	return 1;
457	}
458	}
459	return 0;
460	}
461
462	static void report_message(const char prefix, const char err, va_list params)
463	{
464	int sz;
465	char msg[4096];
466
467	sz = xsnprintf(msg, sizeof(msg), "%s", prefix);
468	sz += vsnprintf(msg + sz, sizeof(msg) - sz, err, params);
469	if (sz > (sizeof(msg) - 1))
470	sz = sizeof(msg) - 1;
471	msg[sz++] = '\n';
472
473	if (use_sideband)
474	send_sideband(1, 2, msg, sz, use_sideband);
475	else
476	xwrite(2, msg, sz);
477	}
478
479	__attribute__((format (printf, 1, 2)))
480	static void rp_warning(const char *err, ...)
481	{
482	va_list params;
483	va_start(params, err);
484	report_message("warning: ", err, params);
485	va_end(params);
486	}
487
488	__attribute__((format (printf, 1, 2)))
489	static void rp_error(const char *err, ...)
490	{
491	va_list params;
492	va_start(params, err);
493	report_message("error: ", err, params);
494	va_end(params);
495	}
496
497	static int copy_to_sideband(int in, int out UNUSED, void *arg UNUSED)
498	{
499	char data[128];
500	int keepalive_active = 0;
501
502	if (keepalive_in_sec <= 0)
503	use_keepalive = KEEPALIVE_NEVER;
504	if (use_keepalive == KEEPALIVE_ALWAYS)
505	keepalive_active = 1;
506
507	while (1) {
508	ssize_t sz;
509
510	if (keepalive_active) {
511	struct pollfd pfd;
512	int ret;
513
514	pfd.fd = in;
515	pfd.events = POLLIN;
516	ret = poll(&pfd, 1, 1000 * keepalive_in_sec);
517
518	if (ret < 0) {
519	if (errno == EINTR)
520	continue;
521	else
522	break;
523	} else if (ret == 0) {
524	/* no data; send a keepalive packet */
525	static const char buf[] = "0005\1";
526	write_or_die(1, buf, sizeof(buf) - 1);
527	continue;
528	} /* else there is actual data to read */
529	}
530
531	sz = xread(in, data, sizeof(data));
532	if (sz <= 0)
533	break;
534
535	if (use_keepalive == KEEPALIVE_AFTER_NUL && !keepalive_active) {
536	const char *p = memchr(data, '\0', sz);
537	if (p) {
538	/*
539	* The NUL tells us to start sending keepalives. Make
540	* sure we send any other data we read along
541	* with it.
542	*/
543	keepalive_active = 1;
544	send_sideband(1, 2, data, p - data, use_sideband);
545	send_sideband(1, 2, p + 1, sz - (p - data + 1), use_sideband);
546	continue;
547	}
548	}
549
550	/*
551	* Either we're not looking for a NUL signal, or we didn't see
552	* it yet; just pass along the data.
553	*/
554	send_sideband(1, 2, data, sz, use_sideband);
555	}
556	close(in);
557	return 0;
558	}
559
560	/*
561	* Start an async thread which redirects hook stderr over the sideband.
562	* The original stderr fd is saved to `saved_stderr` and STDERR_FILENO is
563	* redirected to the async's input pipe.
564	*/
565	static void prepare_sideband_async(struct async sideband_async, int saved_stderr, int *started)
566	{
567	*started = 0;
568
569	if (!use_sideband)
570	return;
571
572	memset(sideband_async, 0, sizeof(*sideband_async));
573	sideband_async->proc = copy_to_sideband;
574	sideband_async->in = -1;
575
576	if (!start_async(sideband_async)) {
577	*started = 1;
578	*saved_stderr = dup(STDERR_FILENO);
579	if (*saved_stderr >= 0)
580	dup2(sideband_async->in, STDERR_FILENO);
581	close(sideband_async->in);
582	}
583	}
584
585	/*
586	* Restore the original stderr and wait for the async sideband thread to finish.
587	*/
588	static void finish_sideband_async(struct async *sideband_async, int saved_stderr, int started)
589	{
590	if (!use_sideband)
591	return;
592
593	if (saved_stderr >= 0) {
594	dup2(saved_stderr, STDERR_FILENO);
595	close(saved_stderr);
596	}
597
598	if (started)
599	finish_async(sideband_async);
600	}
601
602	static void hmac_hash(unsigned char *out,
603	const char *key_in, size_t key_len,
604	const char *text, size_t text_len)
605	{
606	unsigned char key[GIT_MAX_BLKSZ];
607	unsigned char k_ipad[GIT_MAX_BLKSZ];
608	unsigned char k_opad[GIT_MAX_BLKSZ];
609	int i;
610	struct git_hash_ctx ctx;
611
612	/* RFC 2104 2. (1) */
613	memset(key, '\0', GIT_MAX_BLKSZ);
614	if (the_hash_algo->blksz < key_len) {
615	git_hash_init(&ctx, the_hash_algo);
616	git_hash_update(&ctx, key_in, key_len);
617	git_hash_final(key, &ctx);
618	} else {
619	memcpy(key, key_in, key_len);
620	}
621
622	/* RFC 2104 2. (2) & (5) */
623	for (i = 0; i < sizeof(key); i++) {
624	k_ipad[i] = key[i] ^ 0x36;
625	k_opad[i] = key[i] ^ 0x5c;
626	}
627
628	/* RFC 2104 2. (3) & (4) */
629	git_hash_init(&ctx, the_hash_algo);
630	git_hash_update(&ctx, k_ipad, sizeof(k_ipad));
631	git_hash_update(&ctx, text, text_len);
632	git_hash_final(out, &ctx);
633
634	/* RFC 2104 2. (6) & (7) */
635	git_hash_init(&ctx, the_hash_algo);
636	git_hash_update(&ctx, k_opad, sizeof(k_opad));
637	git_hash_update(&ctx, out, the_hash_algo->rawsz);
638	git_hash_final(out, &ctx);
639	}
640
641	static char prepare_push_cert_nonce(const char path, timestamp_t stamp)
642	{
643	struct strbuf buf = STRBUF_INIT;
644	unsigned char hash[GIT_MAX_RAWSZ];
645
646	strbuf_addf(&buf, "%s:%"PRItime, path, stamp);
647	hmac_hash(hash, buf.buf, buf.len, cert_nonce_seed, strlen(cert_nonce_seed));
648	strbuf_release(&buf);
649
650	/* RFC 2104 5. HMAC-SHA1 or HMAC-SHA256 */
651	strbuf_addf(&buf, "%"PRItime"-%.*s", stamp, (int)the_hash_algo->hexsz, hash_to_hex(hash));
652	return strbuf_detach(&buf, NULL);
653	}
654
655	/*
656	* Return zero if a and b are equal up to n bytes and nonzero if they are not.
657	* This operation is guaranteed to run in constant time to avoid leaking data.
658	*/
659	static int constant_memequal(const char a, const char b, size_t n)
660	{
661	int res = 0;
662	size_t i;
663
664	for (i = 0; i < n; i++)
665	res \|= a[i] ^ b[i];
666	return res;
667	}
668
669	static const char check_nonce(const char buf)
670	{
671	size_t noncelen;
672	const char *found = find_commit_header(buf, "nonce", &noncelen);
673	char *nonce = found ? xmemdupz(found, noncelen) : NULL;
674	timestamp_t stamp, ostamp;
675	char bohmac, expect = NULL;
676	const char *retval = NONCE_BAD;
677
678	if (!nonce) {
679	retval = NONCE_MISSING;
680	goto leave;
681	} else if (!push_cert_nonce) {
682	retval = NONCE_UNSOLICITED;
683	goto leave;
684	} else if (!strcmp(push_cert_nonce, nonce)) {
685	retval = NONCE_OK;
686	goto leave;
687	}
688
689	if (!stateless_rpc) {
690	/* returned nonce MUST match what we gave out earlier */
691	retval = NONCE_BAD;
692	goto leave;
693	}
694
695	/*
696	* In stateless mode, we may be receiving a nonce issued by
697	* another instance of the server that serving the same
698	* repository, and the timestamps may not match, but the
699	* nonce-seed and dir should match, so we can recompute and
700	* report the time slop.
701	*
702	* In addition, when a nonce issued by another instance has
703	* timestamp within receive.certnonceslop seconds, we pretend
704	* as if we issued that nonce when reporting to the hook.
705	*/
706
707	/* nonce is concat(<seconds-since-epoch>, "-", <hmac>) */
708	if (nonce <= '0' \|\| '9' < nonce) {
709	retval = NONCE_BAD;
710	goto leave;
711	}
712	stamp = parse_timestamp(nonce, &bohmac, 10);
713	if (bohmac == nonce \|\| bohmac[0] != '-') {
714	retval = NONCE_BAD;
715	goto leave;
716	}
717
718	expect = prepare_push_cert_nonce(service_dir, stamp);
719	if (noncelen != strlen(expect)) {
720	/* This is not even the right size. */
721	retval = NONCE_BAD;
722	goto leave;
723	}
724	if (constant_memequal(expect, nonce, noncelen)) {
725	/* Not what we would have signed earlier */
726	retval = NONCE_BAD;
727	goto leave;
728	}
729
730	/*
731	* By how many seconds is this nonce stale? Negative value
732	* would mean it was issued by another server with its clock
733	* skewed in the future.
734	*/
735	ostamp = parse_timestamp(push_cert_nonce, NULL, 10);
736	nonce_stamp_slop = (long)ostamp - (long)stamp;
737
738	if (nonce_stamp_slop_limit &&
739	labs(nonce_stamp_slop) <= nonce_stamp_slop_limit) {
740	/*
741	* Pretend as if the received nonce (which passes the
742	* HMAC check, so it is not a forged by third-party)
743	* is what we issued.
744	*/
745	free((void *)push_cert_nonce);
746	push_cert_nonce = xstrdup(nonce);
747	retval = NONCE_OK;
748	} else {
749	retval = NONCE_SLOP;
750	}
751
752	leave:
753	free(nonce);
754	free(expect);
755	return retval;
756	}
757
758	/*
759	* Return 1 if there is no push_cert or if the push options in push_cert are
760	* the same as those in the argument; 0 otherwise.
761	*/
762	static int check_cert_push_options(const struct string_list *push_options)
763	{
764	const char *buf = push_cert.buf;
765
766	const char *option;
767	size_t optionlen;
768	int options_seen = 0;
769
770	int retval = 1;
771
772	if (!*buf)
773	return 1;
774
775	while ((option = find_commit_header(buf, "push-option", &optionlen))) {
776	buf = option + optionlen + 1;
777	options_seen++;
778	if (options_seen > push_options->nr
779	\|\| xstrncmpz(push_options->items[options_seen - 1].string,
780	option, optionlen))
781	return 0;
782	}
783
784	if (options_seen != push_options->nr)
785	retval = 0;
786
787	return retval;
788	}
789
790	static void prepare_push_cert_sha1(struct run_hooks_opt *opt)
791	{
792	static int already_done;
793
794	if (!push_cert.len)
795	return;
796
797	if (!already_done) {
798	int bogs /* beginning_of_gpg_sig */;
799
800	already_done = 1;
801	if (odb_write_object(the_repository->objects, push_cert.buf,
802	push_cert.len, OBJ_BLOB, &push_cert_oid))
803	oidclr(&push_cert_oid, the_repository->hash_algo);
804
805	memset(&sigcheck, '\0', sizeof(sigcheck));
806
807	bogs = parse_signed_buffer(push_cert.buf, push_cert.len);
808	sigcheck.payload = xmemdupz(push_cert.buf, bogs);
809	sigcheck.payload_len = bogs;
810	check_signature(&sigcheck, push_cert.buf + bogs,
811	push_cert.len - bogs);
812
813	nonce_status = check_nonce(sigcheck.payload);
814	}
815	if (!is_null_oid(&push_cert_oid)) {
816	strvec_pushf(&opt->env, "GIT_PUSH_CERT=%s",
817	oid_to_hex(&push_cert_oid));
818	strvec_pushf(&opt->env, "GIT_PUSH_CERT_SIGNER=%s",
819	sigcheck.signer ? sigcheck.signer : "");
820	strvec_pushf(&opt->env, "GIT_PUSH_CERT_KEY=%s",
821	sigcheck.key ? sigcheck.key : "");
822	strvec_pushf(&opt->env, "GIT_PUSH_CERT_STATUS=%c",
823	sigcheck.result);
824	if (push_cert_nonce) {
825	strvec_pushf(&opt->env,
826	"GIT_PUSH_CERT_NONCE=%s",
827	push_cert_nonce);
828	strvec_pushf(&opt->env,
829	"GIT_PUSH_CERT_NONCE_STATUS=%s",
830	nonce_status);
831	if (nonce_status == NONCE_SLOP)
832	strvec_pushf(&opt->env,
833	"GIT_PUSH_CERT_NONCE_SLOP=%ld",
834	nonce_stamp_slop);
835	}
836	}
837	}
838
839	struct receive_hook_feed_state {
840	struct command *cmd;
841	struct ref_push_report *report;
842	int skip_broken;
843	struct strbuf buf;
844	};
845
846	static int feed_receive_hook_cb(int hook_stdin_fd, void pp_cb UNUSED, void pp_task_cb)
847	{
848	struct receive_hook_feed_state *state = pp_task_cb;
849	struct command *cmd = state->cmd;
850
851	strbuf_reset(&state->buf);
852
853	while (cmd &&
854	state->skip_broken && (cmd->error_string \|\| cmd->did_not_exist))
855	cmd = cmd->next;
856
857	if (!cmd)
858	return 1; /* no more commands left */
859
860	if (!state->report)
861	state->report = cmd->report;
862
863	if (state->report) {
864	struct object_id *old_oid;
865	struct object_id *new_oid;
866	const char *ref_name;
867
868	old_oid = state->report->old_oid ? state->report->old_oid : &cmd->old_oid;
869	new_oid = state->report->new_oid ? state->report->new_oid : &cmd->new_oid;
870	ref_name = state->report->ref_name ? state->report->ref_name : cmd->ref_name;
871
872	strbuf_addf(&state->buf, "%s %s %s\n",
873	oid_to_hex(old_oid), oid_to_hex(new_oid),
874	ref_name);
875
876	state->report = state->report->next;
877	if (!state->report)
878	cmd = cmd->next;
879	} else {
880	strbuf_addf(&state->buf, "%s %s %s\n",
881	oid_to_hex(&cmd->old_oid), oid_to_hex(&cmd->new_oid),
882	cmd->ref_name);
883	cmd = cmd->next;
884	}
885
886	state->cmd = cmd;
887
888	if (state->buf.len > 0) {
889	int ret = write_in_full(hook_stdin_fd, state->buf.buf, state->buf.len);
890	if (ret < 0) {
891	if (errno == EPIPE)
892	return 1; /* child closed pipe */
893	return ret;
894	}
895	}
896
897	return state->cmd ? 0 : 1; /* 0 = more to come, 1 = EOF */
898	}
899
900	static void receive_hook_feed_state_alloc(void feed_pipe_ctx)
901	{
902	struct receive_hook_feed_state *init_state = feed_pipe_ctx;
903	struct receive_hook_feed_state *data;
904
905	CALLOC_ARRAY(data, 1);
906	data->report = init_state->report;
907	data->cmd = init_state->cmd;
908	data->skip_broken = init_state->skip_broken;
909	strbuf_init(&data->buf, 0);
910
911	return data;
912	}
913
914	static void receive_hook_feed_state_free(void *data)
915	{
916	struct receive_hook_feed_state *d = data;
917	if (!d)
918	return;
919	strbuf_release(&d->buf);
920	free(d);
921	}
922
923	static int run_receive_hook(struct command *commands,
924	const char *hook_name,
925	int skip_broken,
926	struct odb_transaction *transaction,
927	const struct string_list *push_options)
928	{
929	struct run_hooks_opt opt = RUN_HOOKS_OPT_INIT;
930	struct command *iter = commands;
931	struct receive_hook_feed_state feed_init_state = {
932	.cmd = commands,
933	.skip_broken = skip_broken,
934	.buf = STRBUF_INIT,
935	};
936	struct async sideband_async;
937	int sideband_async_started = 0;
938	int saved_stderr = -1;
939	int ret;
940
941	if (!hook_exists(the_repository, hook_name))
942	return 0;
943
944	/* if there are no valid commands, don't invoke the hook at all. */
945	while (iter && skip_broken && (iter->error_string \|\| iter->did_not_exist))
946	iter = iter->next;
947	if (!iter)
948	return 0;
949
950	if (push_options) {
951	for (int i = 0; i < push_options->nr; i++)
952	strvec_pushf(&opt.env, "GIT_PUSH_OPTION_%d=%s", i,
953	push_options->items[i].string);
954	strvec_pushf(&opt.env, "GIT_PUSH_OPTION_COUNT=%"PRIuMAX"",
955	(uintmax_t)push_options->nr);
956	} else {
957	strvec_push(&opt.env, "GIT_PUSH_OPTION_COUNT");
958	}
959
960	if (transaction)
961	odb_transaction_env(transaction, &opt.env);
962
963	prepare_push_cert_sha1(&opt);
964
965	prepare_sideband_async(&sideband_async, &saved_stderr, &sideband_async_started);
966
967	/* set up stdin callback */
968	opt.feed_pipe_ctx = &feed_init_state;
969	opt.feed_pipe = feed_receive_hook_cb;
970	opt.feed_pipe_cb_data_alloc = receive_hook_feed_state_alloc;
971	opt.feed_pipe_cb_data_free = receive_hook_feed_state_free;
972
973	ret = run_hooks_opt(the_repository, hook_name, &opt);
974
975	finish_sideband_async(&sideband_async, saved_stderr, sideband_async_started);
976
977	return ret;
978	}
979
980	static int run_update_hook(struct command *cmd)
981	{
982	static const char hook_name[] = "update";
983	struct run_hooks_opt opt = RUN_HOOKS_OPT_INIT;
984	struct async sideband_async;
985	int sideband_async_started = 0;
986	int saved_stderr = -1;
987	int code;
988
989	if (!hook_exists(the_repository, hook_name))
990	return 0;
991
992	strvec_pushl(&opt.args,
993	cmd->ref_name,
994	oid_to_hex(&cmd->old_oid),
995	oid_to_hex(&cmd->new_oid),
996	NULL);
997
998	prepare_sideband_async(&sideband_async, &saved_stderr, &sideband_async_started);
999
1000	code = run_hooks_opt(the_repository, hook_name, &opt);
1001
1002	finish_sideband_async(&sideband_async, saved_stderr, sideband_async_started);
1003
1004	return code;
1005	}
1006
1007	static struct command find_command_by_refname(struct command list,
1008	const char *refname)
1009	{
1010	for (; list; list = list->next)
1011	if (!strcmp(list->ref_name, refname))
1012	return list;
1013	return NULL;
1014	}
1015
1016	static int read_proc_receive_report(struct packet_reader *reader,
1017	struct command *commands,
1018	struct strbuf *errmsg)
1019	{
1020	struct command *cmd;
1021	struct command *hint = NULL;
1022	struct ref_push_report *report = NULL;
1023	int new_report = 0;
1024	int code = 0;
1025	int once = 0;
1026	int response = 0;
1027
1028	for (;;) {
1029	struct object_id old_oid, new_oid;
1030	char *head;
1031	char *refname;
1032	char *p;
1033	enum packet_read_status status;
1034
1035	status = packet_reader_read(reader);
1036	if (status != PACKET_READ_NORMAL) {
1037	/* Check whether proc-receive exited abnormally */
1038	if (status == PACKET_READ_EOF && !response) {
1039	strbuf_addstr(errmsg, "proc-receive exited abnormally");
1040	return -1;
1041	}
1042	break;
1043	}
1044	response++;
1045
1046	head = reader->line;
1047	p = strchr(head, ' ');
1048	if (!p) {
1049	strbuf_addf(errmsg, "proc-receive reported incomplete status line: '%s'\n", head);
1050	code = -1;
1051	continue;
1052	}
1053	*p++ = '\0';
1054	if (!strcmp(head, "option")) {
1055	char *key;
1056	const char *val;
1057
1058	if (!hint \|\| !(report \|\| new_report)) {
1059	if (!once++)
1060	strbuf_addstr(errmsg, "proc-receive reported 'option' without a matching 'ok/ng' directive\n");
1061	code = -1;
1062	continue;
1063	}
1064	if (new_report) {
1065	if (!hint->report) {
1066	CALLOC_ARRAY(hint->report, 1);
1067	report = hint->report;
1068	} else {
1069	report = hint->report;
1070	while (report->next)
1071	report = report->next;
1072	report->next = xcalloc(1, sizeof(struct ref_push_report));
1073	report = report->next;
1074	}
1075	new_report = 0;
1076	}
1077	key = p;
1078	p = strchr(key, ' ');
1079	if (p)
1080	*p++ = '\0';
1081	val = p;
1082	if (!strcmp(key, "refname"))
1083	report->ref_name = xstrdup_or_null(val);
1084	else if (!strcmp(key, "old-oid") && val &&
1085	!parse_oid_hex(val, &old_oid, &val))
1086	report->old_oid = oiddup(&old_oid);
1087	else if (!strcmp(key, "new-oid") && val &&
1088	!parse_oid_hex(val, &new_oid, &val))
1089	report->new_oid = oiddup(&new_oid);
1090	else if (!strcmp(key, "forced-update"))
1091	report->forced_update = 1;
1092	else if (!strcmp(key, "fall-through"))
1093	/* Fall through, let 'receive-pack' to execute it. */
1094	hint->run_proc_receive = 0;
1095	continue;
1096	}
1097
1098	report = NULL;
1099	new_report = 0;
1100	refname = p;
1101	p = strchr(refname, ' ');
1102	if (p)
1103	*p++ = '\0';
1104	if (strcmp(head, "ok") && strcmp(head, "ng")) {
1105	strbuf_addf(errmsg, "proc-receive reported bad status '%s' on ref '%s'\n",
1106	head, refname);
1107	code = -1;
1108	continue;
1109	}
1110
1111	/* first try searching at our hint, falling back to all refs */
1112	if (hint)
1113	hint = find_command_by_refname(hint, refname);
1114	if (!hint)
1115	hint = find_command_by_refname(commands, refname);
1116	if (!hint) {
1117	strbuf_addf(errmsg, "proc-receive reported status on unknown ref: %s\n",
1118	refname);
1119	code = -1;
1120	continue;
1121	}
1122	if (!hint->run_proc_receive) {
1123	strbuf_addf(errmsg, "proc-receive reported status on unexpected ref: %s\n",
1124	refname);
1125	code = -1;
1126	continue;
1127	}
1128	hint->run_proc_receive \|= RUN_PROC_RECEIVE_RETURNED;
1129	if (!strcmp(head, "ng")) {
1130	if (p)
1131	hint->error_string = hint->error_string_owned = xstrdup(p);
1132	else
1133	hint->error_string = "failed";
1134	code = -1;
1135	continue;
1136	}
1137	new_report = 1;
1138	}
1139
1140	for (cmd = commands; cmd; cmd = cmd->next)
1141	if (cmd->run_proc_receive && !cmd->error_string &&
1142	!(cmd->run_proc_receive & RUN_PROC_RECEIVE_RETURNED)) {
1143	cmd->error_string = "proc-receive failed to report status";
1144	code = -1;
1145	}
1146	return code;
1147	}
1148
1149	static int run_proc_receive_hook(struct command *commands,
1150	const struct string_list *push_options)
1151	{
1152	struct child_process proc = CHILD_PROCESS_INIT;
1153	struct async muxer;
1154	struct command *cmd;
1155	struct packet_reader reader;
1156	struct strbuf cap = STRBUF_INIT;
1157	struct strbuf errmsg = STRBUF_INIT;
1158	int hook_use_push_options = 0;
1159	int version = 0;
1160	int code;
1161	const char *hook_path = find_hook(the_repository, "proc-receive");
1162
1163	if (!hook_path) {
1164	rp_error("cannot find hook 'proc-receive'");
1165	return -1;
1166	}
1167
1168	strvec_push(&proc.args, hook_path);
1169	proc.in = -1;
1170	proc.out = -1;
1171	proc.trace2_hook_name = "proc-receive";
1172
1173	if (use_sideband) {
1174	memset(&muxer, 0, sizeof(muxer));
1175	muxer.proc = copy_to_sideband;
1176	muxer.in = -1;
1177	code = start_async(&muxer);
1178	if (code)
1179	return code;
1180	proc.err = muxer.in;
1181	} else {
1182	proc.err = 0;
1183	}
1184
1185	code = start_command(&proc);
1186	if (code) {
1187	if (use_sideband)
1188	finish_async(&muxer);
1189	return code;
1190	}
1191
1192	sigchain_push(SIGPIPE, SIG_IGN);
1193
1194	/* Version negotiaton */
1195	packet_reader_init(&reader, proc.out, NULL, 0,
1196	PACKET_READ_CHOMP_NEWLINE \|
1197	PACKET_READ_GENTLE_ON_EOF);
1198	if (use_atomic)
1199	strbuf_addstr(&cap, " atomic");
1200	if (use_push_options)
1201	strbuf_addstr(&cap, " push-options");
1202	if (cap.len) {
1203	code = packet_write_fmt_gently(proc.in, "version=1%c%s\n", '\0', cap.buf + 1);
1204	strbuf_release(&cap);
1205	} else {
1206	code = packet_write_fmt_gently(proc.in, "version=1\n");
1207	}
1208	if (!code)
1209	code = packet_flush_gently(proc.in);
1210
1211	if (!code)
1212	for (;;) {
1213	int linelen;
1214	enum packet_read_status status;
1215
1216	status = packet_reader_read(&reader);
1217	if (status != PACKET_READ_NORMAL) {
1218	/* Check whether proc-receive exited abnormally */
1219	if (status == PACKET_READ_EOF)
1220	code = -1;
1221	break;
1222	}
1223
1224	if (reader.pktlen > 8 && starts_with(reader.line, "version=")) {
1225	version = atoi(reader.line + 8);
1226	linelen = strlen(reader.line);
1227	if (linelen < reader.pktlen) {
1228	const char *feature_list = reader.line + linelen + 1;
1229	if (parse_feature_request(feature_list, "push-options"))
1230	hook_use_push_options = 1;
1231	}
1232	}
1233	}
1234
1235	if (code) {
1236	strbuf_addstr(&errmsg, "fail to negotiate version with proc-receive hook");
1237	goto cleanup;
1238	}
1239
1240	switch (version) {
1241	case 0:
1242	/* fallthrough */
1243	case 1:
1244	break;
1245	default:
1246	strbuf_addf(&errmsg, "proc-receive version '%d' is not supported",
1247	version);
1248	code = -1;
1249	goto cleanup;
1250	}
1251
1252	/* Send commands */
1253	for (cmd = commands; cmd; cmd = cmd->next) {
1254	if (!cmd->run_proc_receive \|\| cmd->skip_update \|\| cmd->error_string)
1255	continue;
1256	code = packet_write_fmt_gently(proc.in, "%s %s %s",
1257	oid_to_hex(&cmd->old_oid),
1258	oid_to_hex(&cmd->new_oid),
1259	cmd->ref_name);
1260	if (code)
1261	break;
1262	}
1263	if (!code)
1264	code = packet_flush_gently(proc.in);
1265	if (code) {
1266	strbuf_addstr(&errmsg, "fail to write commands to proc-receive hook");
1267	goto cleanup;
1268	}
1269
1270	/* Send push options */
1271	if (hook_use_push_options) {
1272	struct string_list_item *item;
1273
1274	for_each_string_list_item(item, push_options) {
1275	code = packet_write_fmt_gently(proc.in, "%s", item->string);
1276	if (code)
1277	break;
1278	}
1279	if (!code)
1280	code = packet_flush_gently(proc.in);
1281	if (code) {
1282	strbuf_addstr(&errmsg,
1283	"fail to write push-options to proc-receive hook");
1284	goto cleanup;
1285	}
1286	}
1287
1288	/* Read result from proc-receive */
1289	code = read_proc_receive_report(&reader, commands, &errmsg);
1290
1291	cleanup:
1292	close(proc.in);
1293	close(proc.out);
1294	if (use_sideband)
1295	finish_async(&muxer);
1296	if (finish_command(&proc))
1297	code = -1;
1298	if (errmsg.len >0) {
1299	char *p = errmsg.buf;
1300
1301	p += errmsg.len - 1;
1302	if (*p == '\n')
1303	*p = '\0';
1304	rp_error("%s", errmsg.buf);
1305	strbuf_release(&errmsg);
1306	}
1307	sigchain_pop(SIGPIPE);
1308
1309	return code;
1310	}
1311
1312	static const char *refuse_unconfigured_deny_msg =
1313	N_("By default, updating the current branch in a non-bare repository\n"
1314	"is denied, because it will make the index and work tree inconsistent\n"
1315	"with what you pushed, and will require 'git reset --hard' to match\n"
1316	"the work tree to HEAD.\n"
1317	"\n"
1318	"You can set the 'receive.denyCurrentBranch' configuration variable\n"
1319	"to 'ignore' or 'warn' in the remote repository to allow pushing into\n"
1320	"its current branch; however, this is not recommended unless you\n"
1321	"arranged to update its work tree to match what you pushed in some\n"
1322	"other way.\n"
1323	"\n"
1324	"To squelch this message and still keep the default behaviour, set\n"
1325	"'receive.denyCurrentBranch' configuration variable to 'refuse'.");
1326
1327	static void refuse_unconfigured_deny(void)
1328	{
1329	rp_error("%s", _(refuse_unconfigured_deny_msg));
1330	}
1331
1332	static const char *refuse_unconfigured_deny_delete_current_msg =
1333	N_("By default, deleting the current branch is denied, because the next\n"
1334	"'git clone' won't result in any file checked out, causing confusion.\n"
1335	"\n"
1336	"You can set 'receive.denyDeleteCurrent' configuration variable to\n"
1337	"'warn' or 'ignore' in the remote repository to allow deleting the\n"
1338	"current branch, with or without a warning message.\n"
1339	"\n"
1340	"To squelch this message, you can set it to 'refuse'.");
1341
1342	static void refuse_unconfigured_deny_delete_current(void)
1343	{
1344	rp_error("%s", _(refuse_unconfigured_deny_delete_current_msg));
1345	}
1346
1347	static const struct object_id command_singleton_iterator(void cb_data);
1348	static int update_shallow_ref(struct command cmd, struct shallow_info si)
1349	{
1350	struct shallow_lock shallow_lock = SHALLOW_LOCK_INIT;
1351	struct oid_array extra = OID_ARRAY_INIT;
1352	struct check_connected_options opt = CHECK_CONNECTED_INIT;
1353	uint32_t mask = 1 << (cmd->index % 32);
1354	int i;
1355
1356	trace_printf_key(&trace_shallow,
1357	"shallow: update_shallow_ref %s\n", cmd->ref_name);
1358	for (i = 0; i < si->shallow->nr; i++)
1359	if (si->used_shallow[i] &&
1360	(si->used_shallow[i][cmd->index / 32] & mask) &&
1361	!delayed_reachability_test(si, i))
1362	oid_array_append(&extra, &si->shallow->oid[i]);
1363
1364	setup_alternate_shallow(&shallow_lock, &opt.shallow_file, &extra);
1365	if (check_connected(command_singleton_iterator, cmd, &opt)) {
1366	rollback_shallow_file(the_repository, &shallow_lock);
1367	oid_array_clear(&extra);
1368	return -1;
1369	}
1370
1371	commit_shallow_file(the_repository, &shallow_lock);
1372
1373	/*
1374	* Make sure setup_alternate_shallow() for the next ref does
1375	* not lose these new roots..
1376	*/
1377	for (i = 0; i < extra.nr; i++)
1378	register_shallow(the_repository, &extra.oid[i]);
1379
1380	si->shallow_ref[cmd->index] = 0;
1381	oid_array_clear(&extra);
1382	return 0;
1383	}
1384
1385	static const char push_to_deploy(unsigned char sha1,
1386	struct strvec *env,
1387	const struct worktree *worktree)
1388	{
1389	struct child_process child = CHILD_PROCESS_INIT;
1390
1391	strvec_pushl(&child.args, "update-index", "-q", "--ignore-submodules",
1392	"--refresh", NULL);
1393	strvec_pushv(&child.env, env->v);
1394	child.dir = worktree->path;
1395	child.no_stdin = 1;
1396	child.stdout_to_stderr = 1;
1397	child.git_cmd = 1;
1398	if (run_command(&child))
1399	return "Up-to-date check failed";
1400
1401	/* run_command() does not clean up completely; reinitialize */
1402	child_process_init(&child);
1403	strvec_pushl(&child.args, "diff-files", "--quiet",
1404	"--ignore-submodules", "--", NULL);
1405	strvec_pushv(&child.env, env->v);
1406	child.dir = worktree->path;
1407	child.no_stdin = 1;
1408	child.stdout_to_stderr = 1;
1409	child.git_cmd = 1;
1410	if (run_command(&child))
1411	return "Working directory has unstaged changes";
1412
1413	child_process_init(&child);
1414	strvec_pushl(&child.args, "diff-index", "--quiet", "--cached",
1415	"--ignore-submodules",
1416	/*
1417	* diff-index with either HEAD or an empty tree
1418	*
1419	* NEEDSWORK: is_null_oid() cannot know whether it's an
1420	* unborn HEAD or a corrupt ref. It works for now because
1421	* it's only needed to know if we are comparing HEAD or an
1422	* empty tree.
1423	*/
1424	!is_null_oid(&worktree->head_oid) ? "HEAD" :
1425	empty_tree_oid_hex(the_repository->hash_algo), "--", NULL);
1426	strvec_pushv(&child.env, env->v);
1427	child.no_stdin = 1;
1428	child.no_stdout = 1;
1429	child.stdout_to_stderr = 0;
1430	child.git_cmd = 1;
1431	if (run_command(&child))
1432	return "Working directory has staged changes";
1433
1434	child_process_init(&child);
1435	strvec_pushl(&child.args, "read-tree", "-u", "-m", hash_to_hex(sha1),
1436	NULL);
1437	strvec_pushv(&child.env, env->v);
1438	child.dir = worktree->path;
1439	child.no_stdin = 1;
1440	child.no_stdout = 1;
1441	child.stdout_to_stderr = 0;
1442	child.git_cmd = 1;
1443	if (run_command(&child))
1444	return "Could not update working tree to new HEAD";
1445
1446	return NULL;
1447	}
1448
1449	static const char *push_to_checkout_hook = "push-to-checkout";
1450
1451	static const char push_to_checkout(unsigned char hash,
1452	int *invoked_hook,
1453	struct strvec *env,
1454	const char *work_tree)
1455	{
1456	struct run_hooks_opt opt = RUN_HOOKS_OPT_INIT_FORCE_SERIAL;
1457
1458	opt.invoked_hook = invoked_hook;
1459
1460	strvec_pushv(&opt.env, env->v);
1461	strvec_pushf(&opt.env, "GIT_WORK_TREE=%s", absolute_path(work_tree));
1462	strvec_push(&opt.args, hash_to_hex(hash));
1463	if (run_hooks_opt(the_repository, push_to_checkout_hook, &opt))
1464	return "push-to-checkout hook declined";
1465	else
1466	return NULL;
1467	}
1468
1469	static const char update_worktree(unsigned char sha1, const struct worktree *worktree)
1470	{
1471	const char *retval;
1472	char *git_dir;
1473	struct strvec env = STRVEC_INIT;
1474	int invoked_hook;
1475
1476	if (!worktree \|\| !worktree->path)
1477	BUG("worktree->path must be non-NULL");
1478
1479	if (worktree->is_bare)
1480	return "denyCurrentBranch = updateInstead needs a worktree";
1481	git_dir = get_worktree_git_dir(worktree);
1482
1483	strvec_pushf(&env, "GIT_DIR=%s", absolute_path(git_dir));
1484
1485	retval = push_to_checkout(sha1, &invoked_hook, &env, worktree->path);
1486	if (!invoked_hook)
1487	retval = push_to_deploy(sha1, &env, worktree);
1488
1489	strvec_clear(&env);
1490	free(git_dir);
1491	return retval;
1492	}
1493
1494	static const char update(struct command cmd, struct shallow_info *si)
1495	{
1496	const char *name = cmd->ref_name;
1497	struct strbuf namespaced_name_buf = STRBUF_INIT;
1498	static char *namespaced_name;
1499	const char *ret;
1500	struct object_id *old_oid = &cmd->old_oid;
1501	struct object_id *new_oid = &cmd->new_oid;
1502	int do_update_worktree = 0;
1503	struct worktree **worktrees = get_worktrees(the_repository);
1504	const struct worktree *worktree =
1505	find_shared_symref(worktrees, "HEAD", name);
1506
1507	/* only refs/... are allowed */
1508	if (!starts_with(name, "refs/") \|\|
1509	check_refname_format(name + 5, is_null_oid(new_oid) ?
1510	REFNAME_ALLOW_ONELEVEL : 0)) {
1511	rp_error("refusing to update funny ref '%s' remotely", name);
1512	ret = "funny refname";
1513	goto out;
1514	}
1515
1516	strbuf_addf(&namespaced_name_buf, "%s%s", get_git_namespace(), name);
1517	free(namespaced_name);
1518	namespaced_name = strbuf_detach(&namespaced_name_buf, NULL);
1519
1520	if (worktree && !worktree->is_bare) {
1521	switch (deny_current_branch) {
1522	case DENY_IGNORE:
1523	break;
1524	case DENY_WARN:
1525	rp_warning("updating the current branch");
1526	break;
1527	case DENY_REFUSE:
1528	case DENY_UNCONFIGURED:
1529	rp_error("refusing to update checked out branch: %s", name);
1530	if (deny_current_branch == DENY_UNCONFIGURED)
1531	refuse_unconfigured_deny();
1532	ret = "branch is currently checked out";
1533	goto out;
1534	case DENY_UPDATE_INSTEAD:
1535	/* pass -- let other checks intervene first */
1536	do_update_worktree = 1;
1537	break;
1538	}
1539	}
1540
1541	if (!is_null_oid(new_oid) &&
1542	!odb_has_object(the_repository->objects, new_oid,
1543	ODB_HAS_OBJECT_RECHECK_PACKED \| ODB_HAS_OBJECT_FETCH_PROMISOR)) {
1544	error("unpack should have generated %s, "
1545	"but I can't find it!", oid_to_hex(new_oid));
1546	ret = "bad pack";
1547	goto out;
1548	}
1549
1550	if (!is_null_oid(old_oid) && is_null_oid(new_oid)) {
1551	if (deny_deletes && starts_with(name, "refs/heads/")) {
1552	rp_error("denying ref deletion for %s", name);
1553	ret = "deletion prohibited";
1554	goto out;
1555	}
1556
1557	if (worktree \|\| (head_name && !strcmp(namespaced_name, head_name))) {
1558	switch (deny_delete_current) {
1559	case DENY_IGNORE:
1560	break;
1561	case DENY_WARN:
1562	rp_warning("deleting the current branch");
1563	break;
1564	case DENY_REFUSE:
1565	case DENY_UNCONFIGURED:
1566	case DENY_UPDATE_INSTEAD:
1567	if (deny_delete_current == DENY_UNCONFIGURED)
1568	refuse_unconfigured_deny_delete_current();
1569	rp_error("refusing to delete the current branch: %s", name);
1570	ret = "deletion of the current branch prohibited";
1571	goto out;
1572	default:
1573	ret = "Invalid denyDeleteCurrent setting";
1574	goto out;
1575	}
1576	}
1577	}
1578
1579	if (deny_non_fast_forwards && !is_null_oid(new_oid) &&
1580	!is_null_oid(old_oid) &&
1581	starts_with(name, "refs/heads/")) {
1582	struct object old_object, new_object;
1583	struct commit old_commit, new_commit;
1584	int ret2;
1585
1586	old_object = parse_object(the_repository, old_oid);
1587	new_object = parse_object(the_repository, new_oid);
1588
1589	if (!old_object \|\| !new_object \|\|
1590	old_object->type != OBJ_COMMIT \|\|
1591	new_object->type != OBJ_COMMIT) {
1592	error("bad sha1 objects for %s", name);
1593	ret = "bad ref";
1594	goto out;
1595	}
1596	old_commit = (struct commit *)old_object;
1597	new_commit = (struct commit *)new_object;
1598	ret2 = repo_in_merge_bases(the_repository, old_commit, new_commit);
1599	if (ret2 < 0)
1600	exit(128);
1601	if (!ret2) {
1602	rp_error("denying non-fast-forward %s"
1603	" (you should pull first)", name);
1604	ret = "non-fast-forward";
1605	goto out;
1606	}
1607	}
1608	if (run_update_hook(cmd)) {
1609	rp_error("hook declined to update %s", name);
1610	ret = "hook declined";
1611	goto out;
1612	}
1613
1614	if (do_update_worktree) {
1615	ret = update_worktree(new_oid->hash, worktree);
1616	if (ret)
1617	goto out;
1618	}
1619
1620	if (is_null_oid(new_oid)) {
1621	struct strbuf err = STRBUF_INIT;
1622	if (!parse_object(the_repository, old_oid)) {
1623	old_oid = NULL;
1624	if (refs_ref_exists(get_main_ref_store(the_repository), name)) {
1625	rp_warning("allowing deletion of corrupt ref");
1626	} else {
1627	rp_warning("deleting a non-existent ref");
1628	cmd->did_not_exist = 1;
1629	}
1630	}
1631	if (ref_transaction_delete(transaction,
1632	namespaced_name,
1633	old_oid,
1634	NULL, 0,
1635	"push", &err)) {
1636	rp_error("%s", err.buf);
1637	ret = "failed to delete";
1638	} else {
1639	ret = NULL; /* good */
1640	}
1641	strbuf_release(&err);
1642	} else {
1643	enum ref_transaction_error tx_err;
1644	struct strbuf err = STRBUF_INIT;
1645	if (shallow_update && si->shallow_ref[cmd->index] &&
1646	update_shallow_ref(cmd, si)) {
1647	ret = "shallow error";
1648	goto out;
1649	}
1650
1651	tx_err = ref_transaction_update(transaction,
1652	namespaced_name,
1653	new_oid, old_oid,
1654	NULL, NULL,
1655	0, "push",
1656	&err);
1657	if (tx_err) {
1658	rp_error("%s", err.buf);
1659	if (tx_err == REF_TRANSACTION_ERROR_GENERIC)
1660	ret = "failed to update ref";
1661	else
1662	ret = ref_transaction_error_msg(tx_err);
1663	} else {
1664	ret = NULL; /* good */
1665	}
1666	strbuf_release(&err);
1667	}
1668
1669	out:
1670	free_worktrees(worktrees);
1671	return ret;
1672	}
1673
1674	static void run_update_post_hook(struct command *commands)
1675	{
1676	static const char hook_name[] = "post-update";
1677	struct run_hooks_opt opt = RUN_HOOKS_OPT_INIT;
1678	struct async sideband_async;
1679	struct command *cmd;
1680	int sideband_async_started = 0;
1681	int saved_stderr = -1;
1682
1683	if (!hook_exists(the_repository, hook_name))
1684	return;
1685
1686	for (cmd = commands; cmd; cmd = cmd->next) {
1687	if (cmd->error_string \|\| cmd->did_not_exist)
1688	continue;
1689	strvec_push(&opt.args, cmd->ref_name);
1690	}
1691	if (!opt.args.nr)
1692	return;
1693
1694	prepare_sideband_async(&sideband_async, &saved_stderr, &sideband_async_started);
1695
1696	run_hooks_opt(the_repository, hook_name, &opt);
1697
1698	finish_sideband_async(&sideband_async, saved_stderr, sideband_async_started);
1699	}
1700
1701	static void check_aliased_update_internal(struct command *cmd,
1702	struct string_list *list,
1703	const char *dst_name, int flag)
1704	{
1705	struct string_list_item *item;
1706	struct command *dst_cmd;
1707
1708	if (!(flag & REF_ISSYMREF))
1709	return;
1710
1711	if (!dst_name) {
1712	rp_error("refusing update to broken symref '%s'", cmd->ref_name);
1713	cmd->skip_update = 1;
1714	cmd->error_string = "broken symref";
1715	return;
1716	}
1717	dst_name = strip_namespace(dst_name);
1718
1719	if (!(item = string_list_lookup(list, dst_name)))
1720	return;
1721
1722	cmd->skip_update = 1;
1723
1724	dst_cmd = (struct command *) item->util;
1725
1726	if (oideq(&cmd->old_oid, &dst_cmd->old_oid) &&
1727	oideq(&cmd->new_oid, &dst_cmd->new_oid))
1728	return;
1729
1730	dst_cmd->skip_update = 1;
1731
1732	rp_error("refusing inconsistent update between symref '%s' (%s..%s) and"
1733	" its target '%s' (%s..%s)",
1734	cmd->ref_name,
1735	repo_find_unique_abbrev(the_repository, &cmd->old_oid, DEFAULT_ABBREV),
1736	repo_find_unique_abbrev(the_repository, &cmd->new_oid, DEFAULT_ABBREV),
1737	dst_cmd->ref_name,
1738	repo_find_unique_abbrev(the_repository, &dst_cmd->old_oid, DEFAULT_ABBREV),
1739	repo_find_unique_abbrev(the_repository, &dst_cmd->new_oid, DEFAULT_ABBREV));
1740
1741	cmd->error_string = dst_cmd->error_string =
1742	"inconsistent aliased update";
1743	}
1744
1745	static void check_aliased_update(struct command cmd, struct string_list list)
1746	{
1747	struct strbuf buf = STRBUF_INIT;
1748	const char *dst_name;
1749	int flag;
1750
1751	strbuf_addf(&buf, "%s%s", get_git_namespace(), cmd->ref_name);
1752	dst_name = refs_resolve_ref_unsafe(get_main_ref_store(the_repository),
1753	buf.buf, 0, NULL, &flag);
1754	check_aliased_update_internal(cmd, list, dst_name, flag);
1755	strbuf_release(&buf);
1756	}
1757
1758	static void check_aliased_updates(struct command *commands)
1759	{
1760	struct command *cmd;
1761	struct string_list ref_list = STRING_LIST_INIT_NODUP;
1762
1763	for (cmd = commands; cmd; cmd = cmd->next) {
1764	struct string_list_item *item =
1765	string_list_append(&ref_list, cmd->ref_name);
1766	item->util = (void *)cmd;
1767	}
1768	string_list_sort(&ref_list);
1769
1770	for (cmd = commands; cmd; cmd = cmd->next) {
1771	if (!cmd->error_string)
1772	check_aliased_update(cmd, &ref_list);
1773	}
1774
1775	string_list_clear(&ref_list, 0);
1776	}
1777
1778	static const struct object_id command_singleton_iterator(void cb_data)
1779	{
1780	struct command **cmd_list = cb_data;
1781	struct command cmd = cmd_list;
1782
1783	if (!cmd \|\| is_null_oid(&cmd->new_oid))
1784	return NULL;
1785	cmd_list = NULL; / this returns only one */
1786	return &cmd->new_oid;
1787	}
1788
1789	static void set_connectivity_errors(struct command *commands,
1790	struct shallow_info *si,
1791	struct odb_transaction *transaction)
1792	{
1793	struct command *cmd;
1794
1795	for (cmd = commands; cmd; cmd = cmd->next) {
1796	struct command *singleton = cmd;
1797	struct check_connected_options opt = CHECK_CONNECTED_INIT;
1798	struct strvec env = STRVEC_INIT;
1799
1800	if (shallow_update && si->shallow_ref[cmd->index])
1801	/* to be checked in update_shallow_ref() */
1802	continue;
1803
1804	odb_transaction_env(transaction, &env);
1805	opt.env = env.v;
1806
1807	if (!check_connected(command_singleton_iterator, &singleton,
1808	&opt))
1809	continue;
1810
1811	cmd->error_string = "missing necessary objects";
1812
1813	strvec_clear(&env);
1814	}
1815	}
1816
1817	struct iterate_data {
1818	struct command *cmds;
1819	struct shallow_info *si;
1820	};
1821
1822	static const struct object_id iterate_receive_command_list(void cb_data)
1823	{
1824	struct iterate_data *data = cb_data;
1825	struct command **cmd_list = &data->cmds;
1826	struct command cmd = cmd_list;
1827
1828	for (; cmd; cmd = cmd->next) {
1829	if (shallow_update && data->si->shallow_ref[cmd->index])
1830	/* to be checked in update_shallow_ref() */
1831	continue;
1832	if (!is_null_oid(&cmd->new_oid) && !cmd->skip_update) {
1833	*cmd_list = cmd->next;
1834	return &cmd->new_oid;
1835	}
1836	}
1837	return NULL;
1838	}
1839
1840	static void reject_updates_to_hidden(struct command *commands)
1841	{
1842	struct strbuf refname_full = STRBUF_INIT;
1843	size_t prefix_len;
1844	struct command *cmd;
1845
1846	strbuf_addstr(&refname_full, get_git_namespace());
1847	prefix_len = refname_full.len;
1848
1849	for (cmd = commands; cmd; cmd = cmd->next) {
1850	if (cmd->error_string)
1851	continue;
1852
1853	strbuf_setlen(&refname_full, prefix_len);
1854	strbuf_addstr(&refname_full, cmd->ref_name);
1855
1856	if (!ref_is_hidden(cmd->ref_name, refname_full.buf, &hidden_refs))
1857	continue;
1858	if (is_null_oid(&cmd->new_oid))
1859	cmd->error_string = "deny deleting a hidden ref";
1860	else
1861	cmd->error_string = "deny updating a hidden ref";
1862	}
1863
1864	strbuf_release(&refname_full);
1865	}
1866
1867	static int should_process_cmd(struct command *cmd)
1868	{
1869	return !cmd->error_string && !cmd->skip_update;
1870	}
1871
1872	static void BUG_if_skipped_connectivity_check(struct command *commands,
1873	struct shallow_info *si)
1874	{
1875	struct command *cmd;
1876
1877	for (cmd = commands; cmd; cmd = cmd->next) {
1878	if (should_process_cmd(cmd) && si->shallow_ref[cmd->index])
1879	bug("connectivity check has not been run on ref %s",
1880	cmd->ref_name);
1881	}
1882	BUG_if_bug("connectivity check skipped???");
1883	}
1884
1885	static void ref_transaction_rejection_handler(const char *refname,
1886	const struct object_id *old_oid UNUSED,
1887	const struct object_id *new_oid UNUSED,
1888	const char *old_target UNUSED,
1889	const char *new_target UNUSED,
1890	enum ref_transaction_error err,
1891	const char *details,
1892	void *cb_data)
1893	{
1894	struct strmap *failed_refs = cb_data;
1895
1896	if (details)
1897	rp_error("%s", details);
1898
1899	strmap_put(failed_refs, refname, (char *)ref_transaction_error_msg(err));
1900	}
1901
1902	static void execute_commands_non_atomic(struct command *commands,
1903	struct shallow_info *si)
1904	{
1905	struct command *cmd;
1906	struct strbuf err = STRBUF_INIT;
1907	const char *reported_error = NULL;
1908	struct strmap failed_refs = STRMAP_INIT;
1909
1910	/*
1911	* Reference updates, where D/F conflicts shouldn't arise due to
1912	* one reference being deleted, while the other being created
1913	* are treated as conflicts in batched updates. This is because
1914	* we don't do conflict resolution inside a transaction. To
1915	* mitigate this, delete references in a separate batch.
1916	*
1917	* NEEDSWORK: Add conflict resolution between deletion and creation
1918	* of reference updates within a transaction. With that, we can
1919	* combine the two phases.
1920	*/
1921	enum processing_phase {
1922	PHASE_DELETIONS,
1923	PHASE_OTHERS
1924	};
1925
1926	for (enum processing_phase phase = PHASE_DELETIONS; phase <= PHASE_OTHERS; phase++) {
1927	for (cmd = commands; cmd; cmd = cmd->next) {
1928	if (!should_process_cmd(cmd) \|\| cmd->run_proc_receive)
1929	continue;
1930
1931	if (phase == PHASE_DELETIONS && !is_null_oid(&cmd->new_oid))
1932	continue;
1933	else if (phase == PHASE_OTHERS && is_null_oid(&cmd->new_oid))
1934	continue;
1935
1936	/*
1937	* Lazily create a transaction only when we know there are
1938	* updates to be added.
1939	*/
1940	if (!transaction) {
1941	transaction = ref_store_transaction_begin(get_main_ref_store(the_repository),
1942	REF_TRANSACTION_ALLOW_FAILURE, &err);
1943	if (!transaction) {
1944	rp_error("%s", err.buf);
1945	strbuf_reset(&err);
1946	reported_error = "transaction failed to start";
1947	goto failure;
1948	}
1949	}
1950
1951	cmd->error_string = update(cmd, si);
1952	}
1953
1954	/* No transaction, so nothing to commit */
1955	if (!transaction)
1956	goto cleanup;
1957
1958	if (ref_transaction_commit(transaction, &err)) {
1959	rp_error("%s", err.buf);
1960	reported_error = "failed to update refs";
1961	goto failure;
1962	}
1963
1964	ref_transaction_for_each_rejected_update(transaction,
1965
1966	ref_transaction_rejection_handler,
1967	&failed_refs);
1968
1969	if (strmap_empty(&failed_refs))
1970	goto cleanup;
1971
1972	failure:
1973	for (cmd = commands; cmd; cmd = cmd->next) {
1974	if (reported_error)
1975	cmd->error_string = reported_error;
1976	else if (strmap_contains(&failed_refs, cmd->ref_name))
1977	cmd->error_string = cmd->error_string_owned = xstrdup(strmap_get(&failed_refs, cmd->ref_name));
1978	}
1979
1980	cleanup:
1981	ref_transaction_free(transaction);
1982	transaction = NULL;
1983	strmap_clear(&failed_refs, 0);
1984	strbuf_release(&err);
1985	}
1986	}
1987
1988	static void execute_commands_atomic(struct command *commands,
1989	struct shallow_info *si)
1990	{
1991	struct command *cmd;
1992	struct strbuf err = STRBUF_INIT;
1993	const char *reported_error = "atomic push failure";
1994
1995	transaction = ref_store_transaction_begin(get_main_ref_store(the_repository),
1996	0, &err);
1997	if (!transaction) {
1998	rp_error("%s", err.buf);
1999	strbuf_reset(&err);
2000	reported_error = "transaction failed to start";
2001	goto failure;
2002	}
2003
2004	for (cmd = commands; cmd; cmd = cmd->next) {
2005	if (!should_process_cmd(cmd) \|\| cmd->run_proc_receive)
2006	continue;
2007
2008	cmd->error_string = update(cmd, si);
2009
2010	if (cmd->error_string)
2011	goto failure;
2012	}
2013
2014	if (ref_transaction_commit(transaction, &err)) {
2015	rp_error("%s", err.buf);
2016	reported_error = "atomic transaction failed";
2017	goto failure;
2018	}
2019	goto cleanup;
2020
2021	failure:
2022	for (cmd = commands; cmd; cmd = cmd->next)
2023	if (!cmd->error_string)
2024	cmd->error_string = reported_error;
2025
2026	cleanup:
2027	ref_transaction_free(transaction);
2028	strbuf_release(&err);
2029	}
2030
2031	static void execute_commands(struct command *commands,
2032	const char *unpacker_error,
2033	struct shallow_info *si,
2034	struct odb_transaction *transaction,
2035	const struct string_list *push_options)
2036	{
2037	struct check_connected_options opt = CHECK_CONNECTED_INIT;
2038	struct command *cmd;
2039	struct iterate_data data;
2040	struct async muxer;
2041	int err_fd = 0;
2042	int run_proc_receive = 0;
2043
2044	if (unpacker_error) {
2045	for (cmd = commands; cmd; cmd = cmd->next)
2046	cmd->error_string = "unpacker error";
2047	return;
2048	}
2049
2050	if (!skip_connectivity_check) {
2051	struct strvec env = STRVEC_INIT;
2052
2053	if (use_sideband) {
2054	memset(&muxer, 0, sizeof(muxer));
2055	muxer.proc = copy_to_sideband;
2056	muxer.in = -1;
2057	if (!start_async(&muxer))
2058	err_fd = muxer.in;
2059	/* ...else, continue without relaying sideband */
2060	}
2061
2062	data.cmds = commands;
2063	data.si = si;
2064	opt.err_fd = err_fd;
2065	opt.progress = err_fd && !quiet;
2066	odb_transaction_env(transaction, &env);
2067	opt.env = env.v;
2068	opt.exclude_hidden_refs_section = "receive";
2069
2070	if (check_connected(iterate_receive_command_list, &data, &opt))
2071	set_connectivity_errors(commands, si, transaction);
2072
2073	if (use_sideband)
2074	finish_async(&muxer);
2075
2076	strvec_clear(&env);
2077	}
2078
2079	reject_updates_to_hidden(commands);
2080
2081	/*
2082	* Try to find commands that have special prefix in their reference names,
2083	* and mark them to run an external "proc-receive" hook later.
2084	*/
2085	if (proc_receive_ref) {
2086	for (cmd = commands; cmd; cmd = cmd->next) {
2087	if (!should_process_cmd(cmd))
2088	continue;
2089
2090	if (proc_receive_ref_matches(cmd)) {
2091	cmd->run_proc_receive = RUN_PROC_RECEIVE_SCHEDULED;
2092	run_proc_receive = 1;
2093	}
2094	}
2095	}
2096
2097	if (run_receive_hook(commands, "pre-receive", 0, transaction, push_options)) {
2098	for (cmd = commands; cmd; cmd = cmd->next) {
2099	if (!cmd->error_string)
2100	cmd->error_string = "pre-receive hook declined";
2101	}
2102	return;
2103	}
2104
2105	/*
2106	* If there is no command ready to run, should return directly to destroy
2107	* temporary data in the quarantine area.
2108	*/
2109	for (cmd = commands; cmd && cmd->error_string; cmd = cmd->next)
2110	; /* nothing */
2111	if (!cmd)
2112	return;
2113
2114	/*
2115	* Now we'll start writing out refs, which means the objects need
2116	* to be in their final positions so that other processes can see them.
2117	*/
2118	if (odb_transaction_commit(transaction)) {
2119	for (cmd = commands; cmd; cmd = cmd->next) {
2120	if (!cmd->error_string)
2121	cmd->error_string = "unable to migrate objects to permanent storage";
2122	}
2123	return;
2124	}
2125
2126	check_aliased_updates(commands);
2127
2128	free(head_name_to_free);
2129	head_name = head_name_to_free = refs_resolve_refdup(get_main_ref_store(the_repository),
2130	"HEAD", 0, NULL,
2131	NULL);
2132
2133	if (run_proc_receive &&
2134	run_proc_receive_hook(commands, push_options))
2135	for (cmd = commands; cmd; cmd = cmd->next)
2136	if (!cmd->error_string &&
2137	!(cmd->run_proc_receive & RUN_PROC_RECEIVE_RETURNED) &&
2138	(cmd->run_proc_receive \|\| use_atomic))
2139	cmd->error_string = "fail to run proc-receive hook";
2140
2141	if (use_atomic)
2142	execute_commands_atomic(commands, si);
2143	else
2144	execute_commands_non_atomic(commands, si);
2145
2146	if (shallow_update)
2147	BUG_if_skipped_connectivity_check(commands, si);
2148	}
2149
2150	static struct command queue_command(struct command tail,
2151	const char *line,
2152	int linelen)
2153	{
2154	struct object_id old_oid, new_oid;
2155	struct command *cmd;
2156	const char *refname;
2157	int reflen;
2158	const char *p;
2159
2160	if (parse_oid_hex(line, &old_oid, &p) \|\|
2161	*p++ != ' ' \|\|
2162	parse_oid_hex(p, &new_oid, &p) \|\|
2163	*p++ != ' ')
2164	die("protocol error: expected old/new/ref, got '%s'", line);
2165
2166	refname = p;
2167	reflen = linelen - (p - line);
2168	FLEX_ALLOC_MEM(cmd, ref_name, refname, reflen);
2169	oidcpy(&cmd->old_oid, &old_oid);
2170	oidcpy(&cmd->new_oid, &new_oid);
2171	*tail = cmd;
2172	return &cmd->next;
2173	}
2174
2175	static void free_commands(struct command *commands)
2176	{
2177	while (commands) {
2178	struct command *next = commands->next;
2179
2180	ref_push_report_free(commands->report);
2181	free(commands->error_string_owned);
2182	free(commands);
2183	commands = next;
2184	}
2185	}
2186
2187	static void queue_commands_from_cert(struct command **tail,
2188	struct strbuf *push_cert)
2189	{
2190	const char boc, eoc;
2191
2192	if (*tail)
2193	die("protocol error: got both push certificate and unsigned commands");
2194
2195	boc = strstr(push_cert->buf, "\n\n");
2196	if (!boc)
2197	die("malformed push certificate %.*s", 100, push_cert->buf);
2198	else
2199	boc += 2;
2200	eoc = push_cert->buf + parse_signed_buffer(push_cert->buf, push_cert->len);
2201
2202	while (boc < eoc) {
2203	const char *eol = memchr(boc, '\n', eoc - boc);
2204	tail = queue_command(tail, boc, eol ? eol - boc : eoc - boc);
2205	boc = eol ? eol + 1 : eoc;
2206	}
2207	}
2208
2209	static struct command read_head_info(struct packet_reader reader,
2210	struct oid_array *shallow)
2211	{
2212	struct command *commands = NULL;
2213	struct command **p = &commands;
2214	for (;;) {
2215	int linelen;
2216
2217	if (packet_reader_read(reader) != PACKET_READ_NORMAL)
2218	break;
2219
2220	if (reader->pktlen > 8 && starts_with(reader->line, "shallow ")) {
2221	struct object_id oid;
2222	if (get_oid_hex(reader->line + 8, &oid))
2223	die("protocol error: expected shallow sha, got '%s'",
2224	reader->line + 8);
2225	oid_array_append(shallow, &oid);
2226	continue;
2227	}
2228
2229	linelen = strlen(reader->line);
2230	if (linelen < reader->pktlen) {
2231	const char *feature_list = reader->line + linelen + 1;
2232	const char *hash = NULL;
2233	const char *client_sid;
2234	size_t len = 0;
2235	if (parse_feature_request(feature_list, "report-status"))
2236	report_status = 1;
2237	if (parse_feature_request(feature_list, "report-status-v2"))
2238	report_status_v2 = 1;
2239	if (parse_feature_request(feature_list, "side-band-64k"))
2240	use_sideband = LARGE_PACKET_MAX;
2241	if (parse_feature_request(feature_list, "quiet"))
2242	quiet = 1;
2243	if (advertise_atomic_push
2244	&& parse_feature_request(feature_list, "atomic"))
2245	use_atomic = 1;
2246	if (advertise_push_options
2247	&& parse_feature_request(feature_list, "push-options"))
2248	use_push_options = 1;
2249	hash = parse_feature_value(feature_list, "object-format", &len, NULL);
2250	if (!hash) {
2251	hash = hash_algos[GIT_HASH_SHA1_LEGACY].name;
2252	len = strlen(hash);
2253	}
2254	if (xstrncmpz(the_hash_algo->name, hash, len))
2255	die("error: unsupported object format '%s'", hash);
2256	client_sid = parse_feature_value(feature_list, "session-id", &len, NULL);
2257	if (client_sid) {
2258	char *sid = xstrndup(client_sid, len);
2259	trace2_data_string("transfer", NULL, "client-sid", client_sid);
2260	free(sid);
2261	}
2262	}
2263
2264	if (!strcmp(reader->line, "push-cert")) {
2265	int true_flush = 0;
2266	int saved_options = reader->options;
2267	reader->options &= ~PACKET_READ_CHOMP_NEWLINE;
2268
2269	for (;;) {
2270	packet_reader_read(reader);
2271	if (reader->status == PACKET_READ_FLUSH) {
2272	true_flush = 1;
2273	break;
2274	}
2275	if (reader->status != PACKET_READ_NORMAL) {
2276	die("protocol error: got an unexpected packet");
2277	}
2278	if (!strcmp(reader->line, "push-cert-end\n"))
2279	break; /* end of cert */
2280	strbuf_addstr(&push_cert, reader->line);
2281	}
2282	reader->options = saved_options;
2283
2284	if (true_flush)
2285	break;
2286	continue;
2287	}
2288
2289	p = queue_command(p, reader->line, linelen);
2290	}
2291
2292	if (push_cert.len)
2293	queue_commands_from_cert(p, &push_cert);
2294
2295	return commands;
2296	}
2297
2298	static void read_push_options(struct packet_reader *reader,
2299	struct string_list *options)
2300	{
2301	while (1) {
2302	if (packet_reader_read(reader) != PACKET_READ_NORMAL)
2303	break;
2304
2305	string_list_append(options, reader->line);
2306	}
2307	}
2308
2309	static const char parse_pack_header(struct pack_header hdr)
2310	{
2311	switch (read_pack_header(0, hdr)) {
2312	case PH_ERROR_EOF:
2313	return "eof before pack header was fully read";
2314
2315	case PH_ERROR_PACK_SIGNATURE:
2316	return "protocol error (pack signature mismatch detected)";
2317
2318	case PH_ERROR_PROTOCOL:
2319	return "protocol error (pack version unsupported)";
2320
2321	default:
2322	return "unknown error in parse_pack_header";
2323
2324	case 0:
2325	return NULL;
2326	}
2327	}
2328
2329	static struct tempfile *pack_lockfile;
2330
2331	static void push_header_arg(struct strvec args, struct pack_header hdr)
2332	{
2333	strvec_pushf(args, "--pack_header=%"PRIu32",%"PRIu32,
2334	ntohl(hdr->hdr_version), ntohl(hdr->hdr_entries));
2335	}
2336
2337	static const char unpack(int err_fd, struct shallow_info si,
2338	struct odb_transaction *transaction)
2339	{
2340	struct pack_header hdr;
2341	const char *hdr_err;
2342	int status;
2343	struct child_process child = CHILD_PROCESS_INIT;
2344	int fsck_objects = (receive_fsck_objects >= 0
2345	? receive_fsck_objects
2346	: transfer_fsck_objects >= 0
2347	? transfer_fsck_objects
2348	: 0);
2349
2350	hdr_err = parse_pack_header(&hdr);
2351	if (hdr_err) {
2352	if (err_fd > 0)
2353	close(err_fd);
2354	return hdr_err;
2355	}
2356
2357	if (si->nr_ours \|\| si->nr_theirs) {
2358	alt_shallow_file = setup_temporary_shallow(si->shallow);
2359	strvec_push(&child.args, "--shallow-file");
2360	strvec_push(&child.args, alt_shallow_file);
2361	}
2362
2363	odb_transaction_env(transaction, &child.env);
2364
2365	if (ntohl(hdr.hdr_entries) < unpack_limit) {
2366	strvec_push(&child.args, "unpack-objects");
2367	push_header_arg(&child.args, &hdr);
2368	if (quiet)
2369	strvec_push(&child.args, "-q");
2370	if (fsck_objects)
2371	strvec_pushf(&child.args, "--strict%s",
2372	fsck_msg_types.buf);
2373	if (max_input_size)
2374	strvec_pushf(&child.args, "--max-input-size=%"PRIuMAX,
2375	(uintmax_t)max_input_size);
2376	child.no_stdout = 1;
2377	child.err = err_fd;
2378	child.git_cmd = 1;
2379	status = run_command(&child);
2380	if (status)
2381	return "unpack-objects abnormal exit";
2382	} else {
2383	char hostname[HOST_NAME_MAX + 1];
2384	char *lockfile;
2385
2386	strvec_pushl(&child.args, "index-pack", "--stdin", NULL);
2387	push_header_arg(&child.args, &hdr);
2388
2389	if (xgethostname(hostname, sizeof(hostname)))
2390	xsnprintf(hostname, sizeof(hostname), "localhost");
2391	strvec_pushf(&child.args,
2392	"--keep=receive-pack %"PRIuMAX" on %s",
2393	(uintmax_t)getpid(),
2394	hostname);
2395
2396	if (!quiet && err_fd)
2397	strvec_push(&child.args, "--show-resolving-progress");
2398	if (use_sideband)
2399	strvec_push(&child.args, "--report-end-of-input");
2400	if (fsck_objects)
2401	strvec_pushf(&child.args, "--strict%s",
2402	fsck_msg_types.buf);
2403	if (!reject_thin)
2404	strvec_push(&child.args, "--fix-thin");
2405	if (max_input_size)
2406	strvec_pushf(&child.args, "--max-input-size=%"PRIuMAX,
2407	(uintmax_t)max_input_size);
2408	child.out = -1;
2409	child.err = err_fd;
2410	child.git_cmd = 1;
2411	status = start_command(&child);
2412	if (status)
2413	return "index-pack fork failed";
2414
2415	lockfile = index_pack_lockfile(the_repository, child.out, NULL);
2416	if (lockfile) {
2417	pack_lockfile = register_tempfile(lockfile);
2418	free(lockfile);
2419	}
2420	close(child.out);
2421
2422	status = finish_command(&child);
2423	if (status)
2424	return "index-pack abnormal exit";
2425	odb_reprepare(the_repository->objects);
2426	}
2427	return NULL;
2428	}
2429
2430	static const char unpack_with_sideband(struct shallow_info si,
2431	struct odb_transaction *transaction)
2432	{
2433	struct async muxer;
2434	const char *ret;
2435
2436	if (!use_sideband)
2437	return unpack(0, si, transaction);
2438
2439	use_keepalive = KEEPALIVE_AFTER_NUL;
2440	memset(&muxer, 0, sizeof(muxer));
2441	muxer.proc = copy_to_sideband;
2442	muxer.in = -1;
2443	if (start_async(&muxer))
2444	return NULL;
2445
2446	ret = unpack(muxer.in, si, transaction);
2447
2448	finish_async(&muxer);
2449	return ret;
2450	}
2451
2452	static void prepare_shallow_update(struct shallow_info *si)
2453	{
2454	int i, j, k, bitmap_size = DIV_ROUND_UP(si->ref->nr, 32);
2455
2456	ALLOC_ARRAY(si->used_shallow, si->shallow->nr);
2457	assign_shallow_commits_to_refs(si, si->used_shallow, NULL);
2458
2459	CALLOC_ARRAY(si->need_reachability_test, si->shallow->nr);
2460	CALLOC_ARRAY(si->reachable, si->shallow->nr);
2461	CALLOC_ARRAY(si->shallow_ref, si->ref->nr);
2462
2463	for (i = 0; i < si->nr_ours; i++)
2464	si->need_reachability_test[si->ours[i]] = 1;
2465
2466	for (i = 0; i < si->shallow->nr; i++) {
2467	if (!si->used_shallow[i])
2468	continue;
2469	for (j = 0; j < bitmap_size; j++) {
2470	if (!si->used_shallow[i][j])
2471	continue;
2472	si->need_reachability_test[i]++;
2473	for (k = 0; k < 32; k++)
2474	if (si->used_shallow[i][j] & (1U << k))
2475	si->shallow_ref[j * 32 + k]++;
2476	}
2477
2478	/*
2479	* true for those associated with some refs and belong
2480	* in "ours" list aka "step 7 not done yet"
2481	*/
2482	si->need_reachability_test[i] =
2483	si->need_reachability_test[i] > 1;
2484	}
2485
2486	/*
2487	* keep hooks happy by forcing a temporary shallow file via
2488	* env variable because we can't add --shallow-file to every
2489	* command. check_connected() will be done with
2490	* true .git/shallow though.
2491	*/
2492	setenv(GIT_SHALLOW_FILE_ENVIRONMENT, alt_shallow_file, 1);
2493	}
2494
2495	static void update_shallow_info(struct command *commands,
2496	struct shallow_info *si,
2497	struct oid_array *ref)
2498	{
2499	struct command *cmd;
2500	int *ref_status;
2501	remove_nonexistent_theirs_shallow(si);
2502	if (!si->nr_ours && !si->nr_theirs) {
2503	shallow_update = 0;
2504	return;
2505	}
2506
2507	for (cmd = commands; cmd; cmd = cmd->next) {
2508	if (is_null_oid(&cmd->new_oid))
2509	continue;
2510	oid_array_append(ref, &cmd->new_oid);
2511	cmd->index = ref->nr - 1;
2512	}
2513	si->ref = ref;
2514
2515	if (shallow_update) {
2516	prepare_shallow_update(si);
2517	return;
2518	}
2519
2520	ALLOC_ARRAY(ref_status, ref->nr);
2521	assign_shallow_commits_to_refs(si, NULL, ref_status);
2522	for (cmd = commands; cmd; cmd = cmd->next) {
2523	if (is_null_oid(&cmd->new_oid))
2524	continue;
2525	if (ref_status[cmd->index]) {
2526	cmd->error_string = "shallow update not allowed";
2527	cmd->skip_update = 1;
2528	}
2529	}
2530	free(ref_status);
2531	}
2532
2533	static void report(struct command commands, const char unpack_status)
2534	{
2535	struct command *cmd;
2536	struct strbuf buf = STRBUF_INIT;
2537
2538	packet_buf_write(&buf, "unpack %s\n",
2539	unpack_status ? unpack_status : "ok");
2540	for (cmd = commands; cmd; cmd = cmd->next) {
2541	if (!cmd->error_string)
2542	packet_buf_write(&buf, "ok %s\n",
2543	cmd->ref_name);
2544	else
2545	packet_buf_write(&buf, "ng %s %s\n",
2546	cmd->ref_name, cmd->error_string);
2547	}
2548	packet_buf_flush(&buf);
2549
2550	if (use_sideband)
2551	send_sideband(1, 1, buf.buf, buf.len, use_sideband);
2552	else
2553	write_or_die(1, buf.buf, buf.len);
2554	strbuf_release(&buf);
2555	}
2556
2557	static void report_v2(struct command commands, const char unpack_status)
2558	{
2559	struct command *cmd;
2560	struct strbuf buf = STRBUF_INIT;
2561	struct ref_push_report *report;
2562
2563	packet_buf_write(&buf, "unpack %s\n",
2564	unpack_status ? unpack_status : "ok");
2565	for (cmd = commands; cmd; cmd = cmd->next) {
2566	int count = 0;
2567
2568	if (cmd->error_string) {
2569	packet_buf_write(&buf, "ng %s %s\n",
2570	cmd->ref_name,
2571	cmd->error_string);
2572	continue;
2573	}
2574	packet_buf_write(&buf, "ok %s\n",
2575	cmd->ref_name);
2576	for (report = cmd->report; report; report = report->next) {
2577	if (count++ > 0)
2578	packet_buf_write(&buf, "ok %s\n",
2579	cmd->ref_name);
2580	if (report->ref_name)
2581	packet_buf_write(&buf, "option refname %s\n",
2582	report->ref_name);
2583	if (report->old_oid)
2584	packet_buf_write(&buf, "option old-oid %s\n",
2585	oid_to_hex(report->old_oid));
2586	if (report->new_oid)
2587	packet_buf_write(&buf, "option new-oid %s\n",
2588	oid_to_hex(report->new_oid));
2589	if (report->forced_update)
2590	packet_buf_write(&buf, "option forced-update\n");
2591	}
2592	}
2593	packet_buf_flush(&buf);
2594
2595	if (use_sideband)
2596	send_sideband(1, 1, buf.buf, buf.len, use_sideband);
2597	else
2598	write_or_die(1, buf.buf, buf.len);
2599	strbuf_release(&buf);
2600	}
2601
2602	static int delete_only(struct command *commands)
2603	{
2604	struct command *cmd;
2605	for (cmd = commands; cmd; cmd = cmd->next) {
2606	if (!is_null_oid(&cmd->new_oid))
2607	return 0;
2608	}
2609	return 1;
2610	}
2611
2612	int cmd_receive_pack(int argc,
2613	const char **argv,
2614	const char *prefix,
2615	struct repository *repo UNUSED)
2616	{
2617	int advertise_refs = 0;
2618	struct command *commands;
2619	struct oid_array shallow = OID_ARRAY_INIT;
2620	struct oid_array ref = OID_ARRAY_INIT;
2621	struct shallow_info si;
2622	struct packet_reader reader;
2623	struct odb_transaction *transaction = NULL;
2624
2625	struct option options[] = {
2626	OPT__QUIET(&quiet, N_("quiet")),
2627	OPT_HIDDEN_BOOL(0, "skip-connectivity-check", &skip_connectivity_check, NULL),
2628	OPT_HIDDEN_BOOL(0, "stateless-rpc", &stateless_rpc, NULL),
2629	OPT_HIDDEN_BOOL(0, "http-backend-info-refs", &advertise_refs, NULL),
2630	OPT_ALIAS(0, "advertise-refs", "http-backend-info-refs"),
2631	OPT_HIDDEN_BOOL(0, "reject-thin-pack-for-testing", &reject_thin, NULL),
2632	OPT_END()
2633	};
2634
2635	packet_trace_identity("receive-pack");
2636
2637	argc = parse_options(argc, argv, prefix, options, receive_pack_usage, 0);
2638
2639	if (argc > 1)
2640	usage_msg_opt(_("too many arguments"), receive_pack_usage, options);
2641	if (argc == 0)
2642	usage_msg_opt(_("you must specify a directory"), receive_pack_usage, options);
2643
2644	service_dir = argv[0];
2645
2646	setup_path();
2647
2648	if (!enter_repo(the_repository, service_dir, 0))
2649	die("'%s' does not appear to be a git repository", service_dir);
2650
2651	repo_config(the_repository, receive_pack_config, NULL);
2652	if (cert_nonce_seed)
2653	push_cert_nonce = prepare_push_cert_nonce(service_dir, time(NULL));
2654
2655	if (0 <= receive_unpack_limit)
2656	unpack_limit = receive_unpack_limit;
2657	else if (0 <= transfer_unpack_limit)
2658	unpack_limit = transfer_unpack_limit;
2659
2660	switch (determine_protocol_version_server()) {
2661	case protocol_v2:
2662	/*
2663	* push support for protocol v2 has not been implemented yet,
2664	* so ignore the request to use v2 and fallback to using v0.
2665	*/
2666	break;
2667	case protocol_v1:
2668	/*
2669	* v1 is just the original protocol with a version string,
2670	* so just fall through after writing the version string.
2671	*/
2672	if (advertise_refs \|\| !stateless_rpc)
2673	packet_write_fmt(1, "version 1\n");
2674
2675	/* fallthrough */
2676	case protocol_v0:
2677	break;
2678	case protocol_unknown_version:
2679	BUG("unknown protocol version");
2680	}
2681
2682	if (advertise_refs \|\| !stateless_rpc) {
2683	write_head_info();
2684	}
2685	if (advertise_refs)
2686	return 0;
2687
2688	packet_reader_init(&reader, 0, NULL, 0,
2689	PACKET_READ_CHOMP_NEWLINE \|
2690	PACKET_READ_DIE_ON_ERR_PACKET);
2691
2692	if ((commands = read_head_info(&reader, &shallow))) {
2693	const char *unpack_status = NULL;
2694	struct string_list push_options = STRING_LIST_INIT_DUP;
2695
2696	if (use_push_options)
2697	read_push_options(&reader, &push_options);
2698	if (!check_cert_push_options(&push_options)) {
2699	struct command *cmd;
2700	for (cmd = commands; cmd; cmd = cmd->next)
2701	cmd->error_string = "inconsistent push options";
2702	}
2703
2704	prepare_shallow_info(&si, &shallow);
2705	if (!si.nr_ours && !si.nr_theirs)
2706	shallow_update = 0;
2707	if (!delete_only(commands)) {
2708	if (odb_transaction_begin(the_repository->objects, &transaction, ODB_TRANSACTION_RECEIVE))
2709	unpack_status = "unable to start object transaction";
2710	else
2711	unpack_status = unpack_with_sideband(&si, transaction);
2712	update_shallow_info(commands, &si, &ref);
2713	}
2714	use_keepalive = KEEPALIVE_ALWAYS;
2715	execute_commands(commands, unpack_status, &si, transaction,
2716	&push_options);
2717	delete_tempfile(&pack_lockfile);
2718	sigchain_push(SIGPIPE, SIG_IGN);
2719	if (report_status_v2)
2720	report_v2(commands, unpack_status);
2721	else if (report_status)
2722	report(commands, unpack_status);
2723	sigchain_pop(SIGPIPE);
2724	run_receive_hook(commands, "post-receive", 1, NULL,
2725	&push_options);
2726	run_update_post_hook(commands);
2727	free_commands(commands);
2728	string_list_clear(&push_options, 0);
2729	if (auto_gc) {
2730	struct child_process proc = CHILD_PROCESS_INIT;
2731
2732	if (prepare_auto_maintenance(the_repository, 1, &proc)) {
2733	proc.no_stdin = 1;
2734	proc.stdout_to_stderr = 1;
2735	proc.err = use_sideband ? -1 : 0;
2736
2737	if (!start_command(&proc)) {
2738	if (use_sideband)
2739	copy_to_sideband(proc.err, -1, NULL);
2740	finish_command(&proc);
2741	}
2742	}
2743	}
2744	if (auto_update_server_info)
2745	update_server_info(the_repository, 0);
2746	clear_shallow_info(&si);
2747	}
2748	if (use_sideband)
2749	packet_flush(1);
2750	oid_array_clear(&shallow);
2751	oid_array_clear(&ref);
2752	strvec_clear(&hidden_refs);
2753	free((void *)push_cert_nonce);
2754	return 0;
2755	}