1#include "builtin.h"
2#include "lockfile.h"
3#include "pack.h"
4#include "refs.h"
5#include "pkt-line.h"
6#include "sideband.h"
7#include "run-command.h"
8#include "exec_cmd.h"
9#include "commit.h"
10#include "object.h"
11#include "remote.h"
12#include "connect.h"
13#include "transport.h"
14#include "string-list.h"
15#include "sha1-array.h"
16#include "connected.h"
17#include "argv-array.h"
18#include "version.h"
19#include "tag.h"
20#include "gpg-interface.h"
21#include "sigchain.h"
22static const char receive_pack_usage[] = "git receive-pack <git-dir>";
24enum deny_action {
26 DENY_UNCONFIGURED,
27 DENY_IGNORE,
28 DENY_WARN,
29 DENY_REFUSE
30};
31static int deny_deletes;
33static int deny_non_fast_forwards;
34static enum deny_action deny_current_branch = DENY_UNCONFIGURED;
35static enum deny_action deny_delete_current = DENY_UNCONFIGURED;
36static int receive_fsck_objects = -1;
37static int transfer_fsck_objects = -1;
38static int receive_unpack_limit = -1;
39static int transfer_unpack_limit = -1;
40static int unpack_limit = 100;
41static int report_status;
42static int use_sideband;
43static int quiet;
44static int prefer_ofs_delta = 1;
45static int auto_update_server_info;
46static int auto_gc = 1;
47static int fix_thin = 1;
48static int stateless_rpc;
49static const char *service_dir;
50static const char *head_name;
51static void *head_name_to_free;
52static int sent_capabilities;
53static int shallow_update;
54static const char *alt_shallow_file;
55static struct strbuf push_cert = STRBUF_INIT;
56static unsigned char push_cert_sha1[20];
57static struct signature_check sigcheck;
58static const char *push_cert_nonce;
59static const char *cert_nonce_seed;
60static const char *NONCE_UNSOLICITED = "UNSOLICITED";
62static const char *NONCE_BAD = "BAD";
63static const char *NONCE_MISSING = "MISSING";
64static const char *NONCE_OK = "OK";
65static const char *NONCE_SLOP = "SLOP";
66static const char *nonce_status;
67static long nonce_stamp_slop;
68static unsigned long nonce_stamp_slop_limit;
69static enum deny_action parse_deny_action(const char *var, const char *value)
71{
72 if (value) {
73 if (!strcasecmp(value, "ignore"))
74 return DENY_IGNORE;
75 if (!strcasecmp(value, "warn"))
76 return DENY_WARN;
77 if (!strcasecmp(value, "refuse"))
78 return DENY_REFUSE;
79 }
80 if (git_config_bool(var, value))
81 return DENY_REFUSE;
82 return DENY_IGNORE;
83}
84static int receive_pack_config(const char *var, const char *value, void *cb)
86{
87 int status = parse_hide_refs_config(var, value, "receive");
88 if (status)
90 return status;
91 if (strcmp(var, "receive.denydeletes") == 0) {
93 deny_deletes = git_config_bool(var, value);
94 return 0;
95 }
96 if (strcmp(var, "receive.denynonfastforwards") == 0) {
98 deny_non_fast_forwards = git_config_bool(var, value);
99 return 0;
100 }
101 if (strcmp(var, "receive.unpacklimit") == 0) {
103 receive_unpack_limit = git_config_int(var, value);
104 return 0;
105 }
106 if (strcmp(var, "transfer.unpacklimit") == 0) {
108 transfer_unpack_limit = git_config_int(var, value);
109 return 0;
110 }
111 if (strcmp(var, "receive.fsckobjects") == 0) {
113 receive_fsck_objects = git_config_bool(var, value);
114 return 0;
115 }
116 if (strcmp(var, "transfer.fsckobjects") == 0) {
118 transfer_fsck_objects = git_config_bool(var, value);
119 return 0;
120 }
121 if (!strcmp(var, "receive.denycurrentbranch")) {
123 deny_current_branch = parse_deny_action(var, value);
124 return 0;
125 }
126 if (strcmp(var, "receive.denydeletecurrent") == 0) {
128 deny_delete_current = parse_deny_action(var, value);
129 return 0;
130 }
131 if (strcmp(var, "repack.usedeltabaseoffset") == 0) {
133 prefer_ofs_delta = git_config_bool(var, value);
134 return 0;
135 }
136 if (strcmp(var, "receive.updateserverinfo") == 0) {
138 auto_update_server_info = git_config_bool(var, value);
139 return 0;
140 }
141 if (strcmp(var, "receive.autogc") == 0) {
143 auto_gc = git_config_bool(var, value);
144 return 0;
145 }
146 if (strcmp(var, "receive.shallowupdate") == 0) {
148 shallow_update = git_config_bool(var, value);
149 return 0;
150 }
151 if (strcmp(var, "receive.certnonceseed") == 0)
153 return git_config_string(&cert_nonce_seed, var, value);
154 if (strcmp(var, "receive.certnonceslop") == 0) {
156 nonce_stamp_slop_limit = git_config_ulong(var, value);
157 return 0;
158 }
159 return git_default_config(var, value, cb);
161}
162static void show_ref(const char *path, const unsigned char *sha1)
164{
165 if (ref_is_hidden(path))
166 return;
167 if (sent_capabilities) {
169 packet_write(1, "%s %s\n", sha1_to_hex(sha1), path);
170 } else {
171 struct strbuf cap = STRBUF_INIT;
172 strbuf_addstr(&cap,
174 "report-status delete-refs side-band-64k quiet");
175 if (prefer_ofs_delta)
176 strbuf_addstr(&cap, " ofs-delta");
177 if (push_cert_nonce)
178 strbuf_addf(&cap, " push-cert=%s", push_cert_nonce);
179 strbuf_addf(&cap, " agent=%s", git_user_agent_sanitized());
180 packet_write(1, "%s %s%c%s\n",
181 sha1_to_hex(sha1), path, 0, cap.buf);
182 strbuf_release(&cap);
183 sent_capabilities = 1;
184 }
185}
186static int show_ref_cb(const char *path, const unsigned char *sha1, int flag, void *unused)
188{
189 path = strip_namespace(path);
190 /*
191 * Advertise refs outside our current namespace as ".have"
192 * refs, so that the client can use them to minimize data
193 * transfer but will otherwise ignore them. This happens to
194 * cover ".have" that are thrown in by add_one_alternate_ref()
195 * to mark histories that are complete in our alternates as
196 * well.
197 */
198 if (!path)
199 path = ".have";
200 show_ref(path, sha1);
201 return 0;
202}
203static void show_one_alternate_sha1(const unsigned char sha1[20], void *unused)
205{
206 show_ref(".have", sha1);
207}
208static void collect_one_alternate_ref(const struct ref *ref, void *data)
210{
211 struct sha1_array *sa = data;
212 sha1_array_append(sa, ref->old_sha1);
213}
214static void write_head_info(void)
216{
217 struct sha1_array sa = SHA1_ARRAY_INIT;
218 for_each_alternate_ref(collect_one_alternate_ref, &sa);
219 sha1_array_for_each_unique(&sa, show_one_alternate_sha1, NULL);
220 sha1_array_clear(&sa);
221 for_each_ref(show_ref_cb, NULL);
222 if (!sent_capabilities)
223 show_ref("capabilities^{}", null_sha1);
224 advertise_shallow_grafts(1);
226 /* EOF */
228 packet_flush(1);
229}
230struct command {
232 struct command *next;
233 const char *error_string;
234 unsigned int skip_update:1,
235 did_not_exist:1;
236 int index;
237 unsigned char old_sha1[20];
238 unsigned char new_sha1[20];
239 char ref_name[FLEX_ARRAY]; /* more */
240};
241static void rp_error(const char *err, ...) __attribute__((format (printf, 1, 2)));
243static void rp_warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
244static void report_message(const char *prefix, const char *err, va_list params)
246{
247 int sz = strlen(prefix);
248 char msg[4096];
249 strncpy(msg, prefix, sz);
251 sz += vsnprintf(msg + sz, sizeof(msg) - sz, err, params);
252 if (sz > (sizeof(msg) - 1))
253 sz = sizeof(msg) - 1;
254 msg[sz++] = '\n';
255 if (use_sideband)
257 send_sideband(1, 2, msg, sz, use_sideband);
258 else
259 xwrite(2, msg, sz);
260}
261static void rp_warning(const char *err, ...)
263{
264 va_list params;
265 va_start(params, err);
266 report_message("warning: ", err, params);
267 va_end(params);
268}
269static void rp_error(const char *err, ...)
271{
272 va_list params;
273 va_start(params, err);
274 report_message("error: ", err, params);
275 va_end(params);
276}
277static int copy_to_sideband(int in, int out, void *arg)
279{
280 char data[128];
281 while (1) {
282 ssize_t sz = xread(in, data, sizeof(data));
283 if (sz <= 0)
284 break;
285 send_sideband(1, 2, data, sz, use_sideband);
286 }
287 close(in);
288 return 0;
289}
290#define HMAC_BLOCK_SIZE 64
292static void hmac_sha1(unsigned char *out,
294 const char *key_in, size_t key_len,
295 const char *text, size_t text_len)
296{
297 unsigned char key[HMAC_BLOCK_SIZE];
298 unsigned char k_ipad[HMAC_BLOCK_SIZE];
299 unsigned char k_opad[HMAC_BLOCK_SIZE];
300 int i;
301 git_SHA_CTX ctx;
302 /* RFC 2104 2. (1) */
304 memset(key, '\0', HMAC_BLOCK_SIZE);
305 if (HMAC_BLOCK_SIZE < key_len) {
306 git_SHA1_Init(&ctx);
307 git_SHA1_Update(&ctx, key_in, key_len);
308 git_SHA1_Final(key, &ctx);
309 } else {
310 memcpy(key, key_in, key_len);
311 }
312 /* RFC 2104 2. (2) & (5) */
314 for (i = 0; i < sizeof(key); i++) {
315 k_ipad[i] = key[i] ^ 0x36;
316 k_opad[i] = key[i] ^ 0x5c;
317 }
318 /* RFC 2104 2. (3) & (4) */
320 git_SHA1_Init(&ctx);
321 git_SHA1_Update(&ctx, k_ipad, sizeof(k_ipad));
322 git_SHA1_Update(&ctx, text, text_len);
323 git_SHA1_Final(out, &ctx);
324 /* RFC 2104 2. (6) & (7) */
326 git_SHA1_Init(&ctx);
327 git_SHA1_Update(&ctx, k_opad, sizeof(k_opad));
328 git_SHA1_Update(&ctx, out, 20);
329 git_SHA1_Final(out, &ctx);
330}
331static char *prepare_push_cert_nonce(const char *path, unsigned long stamp)
333{
334 struct strbuf buf = STRBUF_INIT;
335 unsigned char sha1[20];
336 strbuf_addf(&buf, "%s:%lu", path, stamp);
338 hmac_sha1(sha1, buf.buf, buf.len, cert_nonce_seed, strlen(cert_nonce_seed));;
339 strbuf_release(&buf);
340 /* RFC 2104 5. HMAC-SHA1-80 */
342 strbuf_addf(&buf, "%lu-%.*s", stamp, 20, sha1_to_hex(sha1));
343 return strbuf_detach(&buf, NULL);
344}
345/*
347 * NEEDSWORK: reuse find_commit_header() from jk/commit-author-parsing
348 * after dropping "_commit" from its name and possibly moving it out
349 * of commit.c
350 */
351static char *find_header(const char *msg, size_t len, const char *key)
352{
353 int key_len = strlen(key);
354 const char *line = msg;
355 while (line && line < msg + len) {
357 const char *eol = strchrnul(line, '\n');
358 if ((msg + len <= eol) || line == eol)
360 return NULL;
361 if (line + key_len < eol &&
362 !memcmp(line, key, key_len) && line[key_len] == ' ') {
363 int offset = key_len + 1;
364 return xmemdupz(line + offset, (eol - line) - offset);
365 }
366 line = *eol ? eol + 1 : NULL;
367 }
368 return NULL;
369}
370static const char *check_nonce(const char *buf, size_t len)
372{
373 char *nonce = find_header(buf, len, "nonce");
374 unsigned long stamp, ostamp;
375 char *bohmac, *expect = NULL;
376 const char *retval = NONCE_BAD;
377 if (!nonce) {
379 retval = NONCE_MISSING;
380 goto leave;
381 } else if (!push_cert_nonce) {
382 retval = NONCE_UNSOLICITED;
383 goto leave;
384 } else if (!strcmp(push_cert_nonce, nonce)) {
385 retval = NONCE_OK;
386 goto leave;
387 }
388 if (!stateless_rpc) {
390 /* returned nonce MUST match what we gave out earlier */
391 retval = NONCE_BAD;
392 goto leave;
393 }
394 /*
396 * In stateless mode, we may be receiving a nonce issued by
397 * another instance of the server that serving the same
398 * repository, and the timestamps may not match, but the
399 * nonce-seed and dir should match, so we can recompute and
400 * report the time slop.
401 *
402 * In addition, when a nonce issued by another instance has
403 * timestamp within receive.certnonceslop seconds, we pretend
404 * as if we issued that nonce when reporting to the hook.
405 */
406 /* nonce is concat(<seconds-since-epoch>, "-", <hmac>) */
408 if (*nonce <= '0' || '9' < *nonce) {
409 retval = NONCE_BAD;
410 goto leave;
411 }
412 stamp = strtoul(nonce, &bohmac, 10);
413 if (bohmac == nonce || bohmac[0] != '-') {
414 retval = NONCE_BAD;
415 goto leave;
416 }
417 expect = prepare_push_cert_nonce(service_dir, stamp);
419 if (strcmp(expect, nonce)) {
420 /* Not what we would have signed earlier */
421 retval = NONCE_BAD;
422 goto leave;
423 }
424 /*
426 * By how many seconds is this nonce stale? Negative value
427 * would mean it was issued by another server with its clock
428 * skewed in the future.
429 */
430 ostamp = strtoul(push_cert_nonce, NULL, 10);
431 nonce_stamp_slop = (long)ostamp - (long)stamp;
432 if (nonce_stamp_slop_limit &&
434 abs(nonce_stamp_slop) <= nonce_stamp_slop_limit) {
435 /*
436 * Pretend as if the received nonce (which passes the
437 * HMAC check, so it is not a forged by third-party)
438 * is what we issued.
439 */
440 free((void *)push_cert_nonce);
441 push_cert_nonce = xstrdup(nonce);
442 retval = NONCE_OK;
443 } else {
444 retval = NONCE_SLOP;
445 }
446leave:
448 free(nonce);
449 free(expect);
450 return retval;
451}
452static void prepare_push_cert_sha1(struct child_process *proc)
454{
455 static int already_done;
456 if (!push_cert.len)
458 return;
459 if (!already_done) {
461 struct strbuf gpg_output = STRBUF_INIT;
462 struct strbuf gpg_status = STRBUF_INIT;
463 int bogs /* beginning_of_gpg_sig */;
464 already_done = 1;
466 if (write_sha1_file(push_cert.buf, push_cert.len, "blob", push_cert_sha1))
467 hashclr(push_cert_sha1);
468 memset(&sigcheck, '\0', sizeof(sigcheck));
470 sigcheck.result = 'N';
471 bogs = parse_signature(push_cert.buf, push_cert.len);
473 if (verify_signed_buffer(push_cert.buf, bogs,
474 push_cert.buf + bogs, push_cert.len - bogs,
475 &gpg_output, &gpg_status) < 0) {
476 ; /* error running gpg */
477 } else {
478 sigcheck.payload = push_cert.buf;
479 sigcheck.gpg_output = gpg_output.buf;
480 sigcheck.gpg_status = gpg_status.buf;
481 parse_gpg_output(&sigcheck);
482 }
483 strbuf_release(&gpg_output);
485 strbuf_release(&gpg_status);
486 nonce_status = check_nonce(push_cert.buf, bogs);
487 }
488 if (!is_null_sha1(push_cert_sha1)) {
489 argv_array_pushf(&proc->env_array, "GIT_PUSH_CERT=%s",
490 sha1_to_hex(push_cert_sha1));
491 argv_array_pushf(&proc->env_array, "GIT_PUSH_CERT_SIGNER=%s",
492 sigcheck.signer ? sigcheck.signer : "");
493 argv_array_pushf(&proc->env_array, "GIT_PUSH_CERT_KEY=%s",
494 sigcheck.key ? sigcheck.key : "");
495 argv_array_pushf(&proc->env_array, "GIT_PUSH_CERT_STATUS=%c",
496 sigcheck.result);
497 if (push_cert_nonce) {
498 argv_array_pushf(&proc->env_array,
499 "GIT_PUSH_CERT_NONCE=%s",
500 push_cert_nonce);
501 argv_array_pushf(&proc->env_array,
502 "GIT_PUSH_CERT_NONCE_STATUS=%s",
503 nonce_status);
504 if (nonce_status == NONCE_SLOP)
505 argv_array_pushf(&proc->env_array,
506 "GIT_PUSH_CERT_NONCE_SLOP=%ld",
507 nonce_stamp_slop);
508 }
509 }
510}
511typedef int (*feed_fn)(void *, const char **, size_t *);
513static int run_and_feed_hook(const char *hook_name, feed_fn feed, void *feed_state)
514{
515 struct child_process proc = CHILD_PROCESS_INIT;
516 struct async muxer;
517 const char *argv[2];
518 int code;
519 argv[0] = find_hook(hook_name);
521 if (!argv[0])
522 return 0;
523 argv[1] = NULL;
525 proc.argv = argv;
527 proc.in = -1;
528 proc.stdout_to_stderr = 1;
529 if (use_sideband) {
531 memset(&muxer, 0, sizeof(muxer));
532 muxer.proc = copy_to_sideband;
533 muxer.in = -1;
534 code = start_async(&muxer);
535 if (code)
536 return code;
537 proc.err = muxer.in;
538 }
539 prepare_push_cert_sha1(&proc);
541 code = start_command(&proc);
543 if (code) {
544 if (use_sideband)
545 finish_async(&muxer);
546 return code;
547 }
548 sigchain_push(SIGPIPE, SIG_IGN);
550 while (1) {
552 const char *buf;
553 size_t n;
554 if (feed(feed_state, &buf, &n))
555 break;
556 if (write_in_full(proc.in, buf, n) != n)
557 break;
558 }
559 close(proc.in);
560 if (use_sideband)
561 finish_async(&muxer);
562 sigchain_pop(SIGPIPE);
564 return finish_command(&proc);
566}
567struct receive_hook_feed_state {
569 struct command *cmd;
570 int skip_broken;
571 struct strbuf buf;
572};
573static int feed_receive_hook(void *state_, const char **bufp, size_t *sizep)
575{
576 struct receive_hook_feed_state *state = state_;
577 struct command *cmd = state->cmd;
578 while (cmd &&
580 state->skip_broken && (cmd->error_string || cmd->did_not_exist))
581 cmd = cmd->next;
582 if (!cmd)
583 return -1; /* EOF */
584 strbuf_reset(&state->buf);
585 strbuf_addf(&state->buf, "%s %s %s\n",
586 sha1_to_hex(cmd->old_sha1), sha1_to_hex(cmd->new_sha1),
587 cmd->ref_name);
588 state->cmd = cmd->next;
589 if (bufp) {
590 *bufp = state->buf.buf;
591 *sizep = state->buf.len;
592 }
593 return 0;
594}
595static int run_receive_hook(struct command *commands, const char *hook_name,
597 int skip_broken)
598{
599 struct receive_hook_feed_state state;
600 int status;
601 strbuf_init(&state.buf, 0);
603 state.cmd = commands;
604 state.skip_broken = skip_broken;
605 if (feed_receive_hook(&state, NULL, NULL))
606 return 0;
607 state.cmd = commands;
608 status = run_and_feed_hook(hook_name, feed_receive_hook, &state);
609 strbuf_release(&state.buf);
610 return status;
611}
612static int run_update_hook(struct command *cmd)
614{
615 const char *argv[5];
616 struct child_process proc = CHILD_PROCESS_INIT;
617 int code;
618 argv[0] = find_hook("update");
620 if (!argv[0])
621 return 0;
622 argv[1] = cmd->ref_name;
624 argv[2] = sha1_to_hex(cmd->old_sha1);
625 argv[3] = sha1_to_hex(cmd->new_sha1);
626 argv[4] = NULL;
627 proc.no_stdin = 1;
629 proc.stdout_to_stderr = 1;
630 proc.err = use_sideband ? -1 : 0;
631 proc.argv = argv;
632 code = start_command(&proc);
634 if (code)
635 return code;
636 if (use_sideband)
637 copy_to_sideband(proc.err, -1, NULL);
638 return finish_command(&proc);
639}
640static int is_ref_checked_out(const char *ref)
642{
643 if (is_bare_repository())
644 return 0;
645 if (!head_name)
647 return 0;
648 return !strcmp(head_name, ref);
649}
650static char *refuse_unconfigured_deny_msg[] = {
652 "By default, updating the current branch in a non-bare repository",
653 "is denied, because it will make the index and work tree inconsistent",
654 "with what you pushed, and will require 'git reset --hard' to match",
655 "the work tree to HEAD.",
656 "",
657 "You can set 'receive.denyCurrentBranch' configuration variable to",
658 "'ignore' or 'warn' in the remote repository to allow pushing into",
659 "its current branch; however, this is not recommended unless you",
660 "arranged to update its work tree to match what you pushed in some",
661 "other way.",
662 "",
663 "To squelch this message and still keep the default behaviour, set",
664 "'receive.denyCurrentBranch' configuration variable to 'refuse'."
665};
666static void refuse_unconfigured_deny(void)
668{
669 int i;
670 for (i = 0; i < ARRAY_SIZE(refuse_unconfigured_deny_msg); i++)
671 rp_error("%s", refuse_unconfigured_deny_msg[i]);
672}
673static char *refuse_unconfigured_deny_delete_current_msg[] = {
675 "By default, deleting the current branch is denied, because the next",
676 "'git clone' won't result in any file checked out, causing confusion.",
677 "",
678 "You can set 'receive.denyDeleteCurrent' configuration variable to",
679 "'warn' or 'ignore' in the remote repository to allow deleting the",
680 "current branch, with or without a warning message.",
681 "",
682 "To squelch this message, you can set it to 'refuse'."
683};
684static void refuse_unconfigured_deny_delete_current(void)
686{
687 int i;
688 for (i = 0;
689 i < ARRAY_SIZE(refuse_unconfigured_deny_delete_current_msg);
690 i++)
691 rp_error("%s", refuse_unconfigured_deny_delete_current_msg[i]);
692}
693static int command_singleton_iterator(void *cb_data, unsigned char sha1[20]);
695static int update_shallow_ref(struct command *cmd, struct shallow_info *si)
696{
697 static struct lock_file shallow_lock;
698 struct sha1_array extra = SHA1_ARRAY_INIT;
699 const char *alt_file;
700 uint32_t mask = 1 << (cmd->index % 32);
701 int i;
702 trace_printf_key(&trace_shallow,
704 "shallow: update_shallow_ref %s\n", cmd->ref_name);
705 for (i = 0; i < si->shallow->nr; i++)
706 if (si->used_shallow[i] &&
707 (si->used_shallow[i][cmd->index / 32] & mask) &&
708 !delayed_reachability_test(si, i))
709 sha1_array_append(&extra, si->shallow->sha1[i]);
710 setup_alternate_shallow(&shallow_lock, &alt_file, &extra);
712 if (check_shallow_connected(command_singleton_iterator,
713 0, cmd, alt_file)) {
714 rollback_lock_file(&shallow_lock);
715 sha1_array_clear(&extra);
716 return -1;
717 }
718 commit_lock_file(&shallow_lock);
720 /*
722 * Make sure setup_alternate_shallow() for the next ref does
723 * not lose these new roots..
724 */
725 for (i = 0; i < extra.nr; i++)
726 register_shallow(extra.sha1[i]);
727 si->shallow_ref[cmd->index] = 0;
729 sha1_array_clear(&extra);
730 return 0;
731}
732static const char *update(struct command *cmd, struct shallow_info *si)
734{
735 const char *name = cmd->ref_name;
736 struct strbuf namespaced_name_buf = STRBUF_INIT;
737 const char *namespaced_name;
738 unsigned char *old_sha1 = cmd->old_sha1;
739 unsigned char *new_sha1 = cmd->new_sha1;
740 /* only refs/... are allowed */
742 if (!starts_with(name, "refs/") || check_refname_format(name + 5, 0)) {
743 rp_error("refusing to create funny ref '%s' remotely", name);
744 return "funny refname";
745 }
746 strbuf_addf(&namespaced_name_buf, "%s%s", get_git_namespace(), name);
748 namespaced_name = strbuf_detach(&namespaced_name_buf, NULL);
749 if (is_ref_checked_out(namespaced_name)) {
751 switch (deny_current_branch) {
752 case DENY_IGNORE:
753 break;
754 case DENY_WARN:
755 rp_warning("updating the current branch");
756 break;
757 case DENY_REFUSE:
758 case DENY_UNCONFIGURED:
759 rp_error("refusing to update checked out branch: %s", name);
760 if (deny_current_branch == DENY_UNCONFIGURED)
761 refuse_unconfigured_deny();
762 return "branch is currently checked out";
763 }
764 }
765 if (!is_null_sha1(new_sha1) && !has_sha1_file(new_sha1)) {
767 error("unpack should have generated %s, "
768 "but I can't find it!", sha1_to_hex(new_sha1));
769 return "bad pack";
770 }
771 if (!is_null_sha1(old_sha1) && is_null_sha1(new_sha1)) {
773 if (deny_deletes && starts_with(name, "refs/heads/")) {
774 rp_error("denying ref deletion for %s", name);
775 return "deletion prohibited";
776 }
777 if (!strcmp(namespaced_name, head_name)) {
779 switch (deny_delete_current) {
780 case DENY_IGNORE:
781 break;
782 case DENY_WARN:
783 rp_warning("deleting the current branch");
784 break;
785 case DENY_REFUSE:
786 case DENY_UNCONFIGURED:
787 if (deny_delete_current == DENY_UNCONFIGURED)
788 refuse_unconfigured_deny_delete_current();
789 rp_error("refusing to delete the current branch: %s", name);
790 return "deletion of the current branch prohibited";
791 }
792 }
793 }
794 if (deny_non_fast_forwards && !is_null_sha1(new_sha1) &&
796 !is_null_sha1(old_sha1) &&
797 starts_with(name, "refs/heads/")) {
798 struct object *old_object, *new_object;
799 struct commit *old_commit, *new_commit;
800 old_object = parse_object(old_sha1);
802 new_object = parse_object(new_sha1);
803 if (!old_object || !new_object ||
805 old_object->type != OBJ_COMMIT ||
806 new_object->type != OBJ_COMMIT) {
807 error("bad sha1 objects for %s", name);
808 return "bad ref";
809 }
810 old_commit = (struct commit *)old_object;
811 new_commit = (struct commit *)new_object;
812 if (!in_merge_bases(old_commit, new_commit)) {
813 rp_error("denying non-fast-forward %s"
814 " (you should pull first)", name);
815 return "non-fast-forward";
816 }
817 }
818 if (run_update_hook(cmd)) {
819 rp_error("hook declined to update %s", name);
820 return "hook declined";
821 }
822 if (is_null_sha1(new_sha1)) {
824 if (!parse_object(old_sha1)) {
825 old_sha1 = NULL;
826 if (ref_exists(name)) {
827 rp_warning("Allowing deletion of corrupt ref.");
828 } else {
829 rp_warning("Deleting a non-existent ref.");
830 cmd->did_not_exist = 1;
831 }
832 }
833 if (delete_ref(namespaced_name, old_sha1, 0)) {
834 rp_error("failed to delete %s", name);
835 return "failed to delete";
836 }
837 return NULL; /* good */
838 }
839 else {
840 struct strbuf err = STRBUF_INIT;
841 struct ref_transaction *transaction;
842 if (shallow_update && si->shallow_ref[cmd->index] &&
844 update_shallow_ref(cmd, si))
845 return "shallow error";
846 transaction = ref_transaction_begin(&err);
848 if (!transaction ||
849 ref_transaction_update(transaction, namespaced_name,
850 new_sha1, old_sha1, 0, 1, "push",
851 &err) ||
852 ref_transaction_commit(transaction, &err)) {
853 ref_transaction_free(transaction);
854 rp_error("%s", err.buf);
856 strbuf_release(&err);
857 return "failed to update ref";
858 }
859 ref_transaction_free(transaction);
861 strbuf_release(&err);
862 return NULL; /* good */
863 }
864}
865static void run_update_post_hook(struct command *commands)
867{
868 struct command *cmd;
869 int argc;
870 const char **argv;
871 struct child_process proc = CHILD_PROCESS_INIT;
872 char *hook;
873 hook = find_hook("post-update");
875 for (argc = 0, cmd = commands; cmd; cmd = cmd->next) {
876 if (cmd->error_string || cmd->did_not_exist)
877 continue;
878 argc++;
879 }
880 if (!argc || !hook)
881 return;
882 argv = xmalloc(sizeof(*argv) * (2 + argc));
884 argv[0] = hook;
885 for (argc = 1, cmd = commands; cmd; cmd = cmd->next) {
887 if (cmd->error_string || cmd->did_not_exist)
888 continue;
889 argv[argc] = xstrdup(cmd->ref_name);
890 argc++;
891 }
892 argv[argc] = NULL;
893 proc.no_stdin = 1;
895 proc.stdout_to_stderr = 1;
896 proc.err = use_sideband ? -1 : 0;
897 proc.argv = argv;
898 if (!start_command(&proc)) {
900 if (use_sideband)
901 copy_to_sideband(proc.err, -1, NULL);
902 finish_command(&proc);
903 }
904}
905static void check_aliased_update(struct command *cmd, struct string_list *list)
907{
908 struct strbuf buf = STRBUF_INIT;
909 const char *dst_name;
910 struct string_list_item *item;
911 struct command *dst_cmd;
912 unsigned char sha1[20];
913 char cmd_oldh[41], cmd_newh[41], dst_oldh[41], dst_newh[41];
914 int flag;
915 strbuf_addf(&buf, "%s%s", get_git_namespace(), cmd->ref_name);
917 dst_name = resolve_ref_unsafe(buf.buf, 0, sha1, &flag);
918 strbuf_release(&buf);
919 if (!(flag & REF_ISSYMREF))
921 return;
922 dst_name = strip_namespace(dst_name);
924 if (!dst_name) {
925 rp_error("refusing update to broken symref '%s'", cmd->ref_name);
926 cmd->skip_update = 1;
927 cmd->error_string = "broken symref";
928 return;
929 }
930 if ((item = string_list_lookup(list, dst_name)) == NULL)
932 return;
933 cmd->skip_update = 1;
935 dst_cmd = (struct command *) item->util;
937 if (!hashcmp(cmd->old_sha1, dst_cmd->old_sha1) &&
939 !hashcmp(cmd->new_sha1, dst_cmd->new_sha1))
940 return;
941 dst_cmd->skip_update = 1;
943 strcpy(cmd_oldh, find_unique_abbrev(cmd->old_sha1, DEFAULT_ABBREV));
945 strcpy(cmd_newh, find_unique_abbrev(cmd->new_sha1, DEFAULT_ABBREV));
946 strcpy(dst_oldh, find_unique_abbrev(dst_cmd->old_sha1, DEFAULT_ABBREV));
947 strcpy(dst_newh, find_unique_abbrev(dst_cmd->new_sha1, DEFAULT_ABBREV));
948 rp_error("refusing inconsistent update between symref '%s' (%s..%s) and"
949 " its target '%s' (%s..%s)",
950 cmd->ref_name, cmd_oldh, cmd_newh,
951 dst_cmd->ref_name, dst_oldh, dst_newh);
952 cmd->error_string = dst_cmd->error_string =
954 "inconsistent aliased update";
955}
956static void check_aliased_updates(struct command *commands)
958{
959 struct command *cmd;
960 struct string_list ref_list = STRING_LIST_INIT_NODUP;
961 for (cmd = commands; cmd; cmd = cmd->next) {
963 struct string_list_item *item =
964 string_list_append(&ref_list, cmd->ref_name);
965 item->util = (void *)cmd;
966 }
967 sort_string_list(&ref_list);
968 for (cmd = commands; cmd; cmd = cmd->next) {
970 if (!cmd->error_string)
971 check_aliased_update(cmd, &ref_list);
972 }
973 string_list_clear(&ref_list, 0);
975}
976static int command_singleton_iterator(void *cb_data, unsigned char sha1[20])
978{
979 struct command **cmd_list = cb_data;
980 struct command *cmd = *cmd_list;
981 if (!cmd || is_null_sha1(cmd->new_sha1))
983 return -1; /* end of list */
984 *cmd_list = NULL; /* this returns only one */
985 hashcpy(sha1, cmd->new_sha1);
986 return 0;
987}
988static void set_connectivity_errors(struct command *commands,
990 struct shallow_info *si)
991{
992 struct command *cmd;
993 for (cmd = commands; cmd; cmd = cmd->next) {
995 struct command *singleton = cmd;
996 if (shallow_update && si->shallow_ref[cmd->index])
997 /* to be checked in update_shallow_ref() */
998 continue;
999 if (!check_everything_connected(command_singleton_iterator,
1000 0, &singleton))
1001 continue;
1002 cmd->error_string = "missing necessary objects";
1003 }
1004}
1005struct iterate_data {
1007 struct command *cmds;
1008 struct shallow_info *si;
1009};
1010static int iterate_receive_command_list(void *cb_data, unsigned char sha1[20])
1012{
1013 struct iterate_data *data = cb_data;
1014 struct command **cmd_list = &data->cmds;
1015 struct command *cmd = *cmd_list;
1016 for (; cmd; cmd = cmd->next) {
1018 if (shallow_update && data->si->shallow_ref[cmd->index])
1019 /* to be checked in update_shallow_ref() */
1020 continue;
1021 if (!is_null_sha1(cmd->new_sha1) && !cmd->skip_update) {
1022 hashcpy(sha1, cmd->new_sha1);
1023 *cmd_list = cmd->next;
1024 return 0;
1025 }
1026 }
1027 *cmd_list = NULL;
1028 return -1; /* end of list */
1029}
1030static void reject_updates_to_hidden(struct command *commands)
1032{
1033 struct command *cmd;
1034 for (cmd = commands; cmd; cmd = cmd->next) {
1036 if (cmd->error_string || !ref_is_hidden(cmd->ref_name))
1037 continue;
1038 if (is_null_sha1(cmd->new_sha1))
1039 cmd->error_string = "deny deleting a hidden ref";
1040 else
1041 cmd->error_string = "deny updating a hidden ref";
1042 }
1043}
1044static void execute_commands(struct command *commands,
1046 const char *unpacker_error,
1047 struct shallow_info *si)
1048{
1049 int checked_connectivity;
1050 struct command *cmd;
1051 unsigned char sha1[20];
1052 struct iterate_data data;
1053 if (unpacker_error) {
1055 for (cmd = commands; cmd; cmd = cmd->next)
1056 cmd->error_string = "unpacker error";
1057 return;
1058 }
1059 data.cmds = commands;
1061 data.si = si;
1062 if (check_everything_connected(iterate_receive_command_list, 0, &data))
1063 set_connectivity_errors(commands, si);
1064 reject_updates_to_hidden(commands);
1066 if (run_receive_hook(commands, "pre-receive", 0)) {
1068 for (cmd = commands; cmd; cmd = cmd->next) {
1069 if (!cmd->error_string)
1070 cmd->error_string = "pre-receive hook declined";
1071 }
1072 return;
1073 }
1074 check_aliased_updates(commands);
1076 free(head_name_to_free);
1078 head_name = head_name_to_free = resolve_refdup("HEAD", 0, sha1, NULL);
1079 checked_connectivity = 1;
1081 for (cmd = commands; cmd; cmd = cmd->next) {
1082 if (cmd->error_string)
1083 continue;
1084 if (cmd->skip_update)
1086 continue;
1087 cmd->error_string = update(cmd, si);
1089 if (shallow_update && !cmd->error_string &&
1090 si->shallow_ref[cmd->index]) {
1091 error("BUG: connectivity check has not been run on ref %s",
1092 cmd->ref_name);
1093 checked_connectivity = 0;
1094 }
1095 }
1096 if (shallow_update && !checked_connectivity)
1098 error("BUG: run 'git fsck' for safety.\n"
1099 "If there are errors, try to remove "
1100 "the reported refs above");
1101}
1102static struct command **queue_command(struct command **tail,
1104 const char *line,
1105 int linelen)
1106{
1107 unsigned char old_sha1[20], new_sha1[20];
1108 struct command *cmd;
1109 const char *refname;
1110 int reflen;
1111 if (linelen < 83 ||
1113 line[40] != ' ' ||
1114 line[81] != ' ' ||
1115 get_sha1_hex(line, old_sha1) ||
1116 get_sha1_hex(line + 41, new_sha1))
1117 die("protocol error: expected old/new/ref, got '%s'", line);
1118 refname = line + 82;
1120 reflen = linelen - 82;
1121 cmd = xcalloc(1, sizeof(struct command) + reflen + 1);
1122 hashcpy(cmd->old_sha1, old_sha1);
1123 hashcpy(cmd->new_sha1, new_sha1);
1124 memcpy(cmd->ref_name, refname, reflen);
1125 cmd->ref_name[reflen] = '\0';
1126 *tail = cmd;
1127 return &cmd->next;
1128}
1129static void queue_commands_from_cert(struct command **tail,
1131 struct strbuf *push_cert)
1132{
1133 const char *boc, *eoc;
1134 if (*tail)
1136 die("protocol error: got both push certificate and unsigned commands");
1137 boc = strstr(push_cert->buf, "\n\n");
1139 if (!boc)
1140 die("malformed push certificate %.*s", 100, push_cert->buf);
1141 else
1142 boc += 2;
1143 eoc = push_cert->buf + parse_signature(push_cert->buf, push_cert->len);
1144 while (boc < eoc) {
1146 const char *eol = memchr(boc, '\n', eoc - boc);
1147 tail = queue_command(tail, boc, eol ? eol - boc : eoc - eol);
1148 boc = eol ? eol + 1 : eoc;
1149 }
1150}
1151static struct command *read_head_info(struct sha1_array *shallow)
1153{
1154 struct command *commands = NULL;
1155 struct command **p = &commands;
1156 for (;;) {
1157 char *line;
1158 int len, linelen;
1159 line = packet_read_line(0, &len);
1161 if (!line)
1162 break;
1163 if (len == 48 && starts_with(line, "shallow ")) {
1165 unsigned char sha1[20];
1166 if (get_sha1_hex(line + 8, sha1))
1167 die("protocol error: expected shallow sha, got '%s'",
1168 line + 8);
1169 sha1_array_append(shallow, sha1);
1170 continue;
1171 }
1172 linelen = strlen(line);
1174 if (linelen < len) {
1175 const char *feature_list = line + linelen + 1;
1176 if (parse_feature_request(feature_list, "report-status"))
1177 report_status = 1;
1178 if (parse_feature_request(feature_list, "side-band-64k"))
1179 use_sideband = LARGE_PACKET_MAX;
1180 if (parse_feature_request(feature_list, "quiet"))
1181 quiet = 1;
1182 }
1183 if (!strcmp(line, "push-cert")) {
1185 int true_flush = 0;
1186 char certbuf[1024];
1187 for (;;) {
1189 len = packet_read(0, NULL, NULL,
1190 certbuf, sizeof(certbuf), 0);
1191 if (!len) {
1192 true_flush = 1;
1193 break;
1194 }
1195 if (!strcmp(certbuf, "push-cert-end\n"))
1196 break; /* end of cert */
1197 strbuf_addstr(&push_cert, certbuf);
1198 }
1199 if (true_flush)
1201 break;
1202 continue;
1203 }
1204 p = queue_command(p, line, linelen);
1206 }
1207 if (push_cert.len)
1209 queue_commands_from_cert(p, &push_cert);
1210 return commands;
1212}
1213static const char *parse_pack_header(struct pack_header *hdr)
1215{
1216 switch (read_pack_header(0, hdr)) {
1217 case PH_ERROR_EOF:
1218 return "eof before pack header was fully read";
1219 case PH_ERROR_PACK_SIGNATURE:
1221 return "protocol error (pack signature mismatch detected)";
1222 case PH_ERROR_PROTOCOL:
1224 return "protocol error (pack version unsupported)";
1225 default:
1227 return "unknown error in parse_pack_header";
1228 case 0:
1230 return NULL;
1231 }
1232}
1233static const char *pack_lockfile;
1235static const char *unpack(int err_fd, struct shallow_info *si)
1237{
1238 struct pack_header hdr;
1239 const char *hdr_err;
1240 int status;
1241 char hdr_arg[38];
1242 struct child_process child = CHILD_PROCESS_INIT;
1243 int fsck_objects = (receive_fsck_objects >= 0
1244 ? receive_fsck_objects
1245 : transfer_fsck_objects >= 0
1246 ? transfer_fsck_objects
1247 : 0);
1248 hdr_err = parse_pack_header(&hdr);
1250 if (hdr_err) {
1251 if (err_fd > 0)
1252 close(err_fd);
1253 return hdr_err;
1254 }
1255 snprintf(hdr_arg, sizeof(hdr_arg),
1256 "--pack_header=%"PRIu32",%"PRIu32,
1257 ntohl(hdr.hdr_version), ntohl(hdr.hdr_entries));
1258 if (si->nr_ours || si->nr_theirs) {
1260 alt_shallow_file = setup_temporary_shallow(si->shallow);
1261 argv_array_push(&child.args, "--shallow-file");
1262 argv_array_push(&child.args, alt_shallow_file);
1263 }
1264 if (ntohl(hdr.hdr_entries) < unpack_limit) {
1266 argv_array_pushl(&child.args, "unpack-objects", hdr_arg, NULL);
1267 if (quiet)
1268 argv_array_push(&child.args, "-q");
1269 if (fsck_objects)
1270 argv_array_push(&child.args, "--strict");
1271 child.no_stdout = 1;
1272 child.err = err_fd;
1273 child.git_cmd = 1;
1274 status = run_command(&child);
1275 if (status)
1276 return "unpack-objects abnormal exit";
1277 } else {
1278 int s;
1279 char keep_arg[256];
1280 s = sprintf(keep_arg, "--keep=receive-pack %"PRIuMAX" on ", (uintmax_t) getpid());
1282 if (gethostname(keep_arg + s, sizeof(keep_arg) - s))
1283 strcpy(keep_arg + s, "localhost");
1284 argv_array_pushl(&child.args, "index-pack",
1286 "--stdin", hdr_arg, keep_arg, NULL);
1287 if (fsck_objects)
1288 argv_array_push(&child.args, "--strict");
1289 if (fix_thin)
1290 argv_array_push(&child.args, "--fix-thin");
1291 child.out = -1;
1292 child.err = err_fd;
1293 child.git_cmd = 1;
1294 status = start_command(&child);
1295 if (status)
1296 return "index-pack fork failed";
1297 pack_lockfile = index_pack_lockfile(child.out);
1298 close(child.out);
1299 status = finish_command(&child);
1300 if (status)
1301 return "index-pack abnormal exit";
1302 reprepare_packed_git();
1303 }
1304 return NULL;
1305}
1306static const char *unpack_with_sideband(struct shallow_info *si)
1308{
1309 struct async muxer;
1310 const char *ret;
1311 if (!use_sideband)
1313 return unpack(0, si);
1314 memset(&muxer, 0, sizeof(muxer));
1316 muxer.proc = copy_to_sideband;
1317 muxer.in = -1;
1318 if (start_async(&muxer))
1319 return NULL;
1320 ret = unpack(muxer.in, si);
1322 finish_async(&muxer);
1324 return ret;
1325}
1326static void prepare_shallow_update(struct command *commands,
1328 struct shallow_info *si)
1329{
1330 int i, j, k, bitmap_size = (si->ref->nr + 31) / 32;
1331 si->used_shallow = xmalloc(sizeof(*si->used_shallow) *
1333 si->shallow->nr);
1334 assign_shallow_commits_to_refs(si, si->used_shallow, NULL);
1335 si->need_reachability_test =
1337 xcalloc(si->shallow->nr, sizeof(*si->need_reachability_test));
1338 si->reachable =
1339 xcalloc(si->shallow->nr, sizeof(*si->reachable));
1340 si->shallow_ref = xcalloc(si->ref->nr, sizeof(*si->shallow_ref));
1341 for (i = 0; i < si->nr_ours; i++)
1343 si->need_reachability_test[si->ours[i]] = 1;
1344 for (i = 0; i < si->shallow->nr; i++) {
1346 if (!si->used_shallow[i])
1347 continue;
1348 for (j = 0; j < bitmap_size; j++) {
1349 if (!si->used_shallow[i][j])
1350 continue;
1351 si->need_reachability_test[i]++;
1352 for (k = 0; k < 32; k++)
1353 if (si->used_shallow[i][j] & (1 << k))
1354 si->shallow_ref[j * 32 + k]++;
1355 }
1356 /*
1358 * true for those associated with some refs and belong
1359 * in "ours" list aka "step 7 not done yet"
1360 */
1361 si->need_reachability_test[i] =
1362 si->need_reachability_test[i] > 1;
1363 }
1364 /*
1366 * keep hooks happy by forcing a temporary shallow file via
1367 * env variable because we can't add --shallow-file to every
1368 * command. check_everything_connected() will be done with
1369 * true .git/shallow though.
1370 */
1371 setenv(GIT_SHALLOW_FILE_ENVIRONMENT, alt_shallow_file, 1);
1372}
1373static void update_shallow_info(struct command *commands,
1375 struct shallow_info *si,
1376 struct sha1_array *ref)
1377{
1378 struct command *cmd;
1379 int *ref_status;
1380 remove_nonexistent_theirs_shallow(si);
1381 if (!si->nr_ours && !si->nr_theirs) {
1382 shallow_update = 0;
1383 return;
1384 }
1385 for (cmd = commands; cmd; cmd = cmd->next) {
1387 if (is_null_sha1(cmd->new_sha1))
1388 continue;
1389 sha1_array_append(ref, cmd->new_sha1);
1390 cmd->index = ref->nr - 1;
1391 }
1392 si->ref = ref;
1393 if (shallow_update) {
1395 prepare_shallow_update(commands, si);
1396 return;
1397 }
1398 ref_status = xmalloc(sizeof(*ref_status) * ref->nr);
1400 assign_shallow_commits_to_refs(si, NULL, ref_status);
1401 for (cmd = commands; cmd; cmd = cmd->next) {
1402 if (is_null_sha1(cmd->new_sha1))
1403 continue;
1404 if (ref_status[cmd->index]) {
1405 cmd->error_string = "shallow update not allowed";
1406 cmd->skip_update = 1;
1407 }
1408 }
1409 free(ref_status);
1410}
1411static void report(struct command *commands, const char *unpack_status)
1413{
1414 struct command *cmd;
1415 struct strbuf buf = STRBUF_INIT;
1416 packet_buf_write(&buf, "unpack %s\n",
1418 unpack_status ? unpack_status : "ok");
1419 for (cmd = commands; cmd; cmd = cmd->next) {
1420 if (!cmd->error_string)
1421 packet_buf_write(&buf, "ok %s\n",
1422 cmd->ref_name);
1423 else
1424 packet_buf_write(&buf, "ng %s %s\n",
1425 cmd->ref_name, cmd->error_string);
1426 }
1427 packet_buf_flush(&buf);
1428 if (use_sideband)
1430 send_sideband(1, 1, buf.buf, buf.len, use_sideband);
1431 else
1432 write_or_die(1, buf.buf, buf.len);
1433 strbuf_release(&buf);
1434}
1435static int delete_only(struct command *commands)
1437{
1438 struct command *cmd;
1439 for (cmd = commands; cmd; cmd = cmd->next) {
1440 if (!is_null_sha1(cmd->new_sha1))
1441 return 0;
1442 }
1443 return 1;
1444}
1445int cmd_receive_pack(int argc, const char **argv, const char *prefix)
1447{
1448 int advertise_refs = 0;
1449 int i;
1450 struct command *commands;
1451 struct sha1_array shallow = SHA1_ARRAY_INIT;
1452 struct sha1_array ref = SHA1_ARRAY_INIT;
1453 struct shallow_info si;
1454 packet_trace_identity("receive-pack");
1456 argv++;
1458 for (i = 1; i < argc; i++) {
1459 const char *arg = *argv++;
1460 if (*arg == '-') {
1462 if (!strcmp(arg, "--quiet")) {
1463 quiet = 1;
1464 continue;
1465 }
1466 if (!strcmp(arg, "--advertise-refs")) {
1468 advertise_refs = 1;
1469 continue;
1470 }
1471 if (!strcmp(arg, "--stateless-rpc")) {
1472 stateless_rpc = 1;
1473 continue;
1474 }
1475 if (!strcmp(arg, "--reject-thin-pack-for-testing")) {
1476 fix_thin = 0;
1477 continue;
1478 }
1479 usage(receive_pack_usage);
1481 }
1482 if (service_dir)
1483 usage(receive_pack_usage);
1484 service_dir = arg;
1485 }
1486 if (!service_dir)
1487 usage(receive_pack_usage);
1488 setup_path();
1490 if (!enter_repo(service_dir, 0))
1492 die("'%s' does not appear to be a git repository", service_dir);
1493 git_config(receive_pack_config, NULL);
1495 if (cert_nonce_seed)
1496 push_cert_nonce = prepare_push_cert_nonce(service_dir, time(NULL));
1497 if (0 <= transfer_unpack_limit)
1499 unpack_limit = transfer_unpack_limit;
1500 else if (0 <= receive_unpack_limit)
1501 unpack_limit = receive_unpack_limit;
1502 if (advertise_refs || !stateless_rpc) {
1504 write_head_info();
1505 }
1506 if (advertise_refs)
1507 return 0;
1508 if ((commands = read_head_info(&shallow)) != NULL) {
1510 const char *unpack_status = NULL;
1511 prepare_shallow_info(&si, &shallow);
1513 if (!si.nr_ours && !si.nr_theirs)
1514 shallow_update = 0;
1515 if (!delete_only(commands)) {
1516 unpack_status = unpack_with_sideband(&si);
1517 update_shallow_info(commands, &si, &ref);
1518 }
1519 execute_commands(commands, unpack_status, &si);
1520 if (pack_lockfile)
1521 unlink_or_warn(pack_lockfile);
1522 if (report_status)
1523 report(commands, unpack_status);
1524 run_receive_hook(commands, "post-receive", 1);
1525 run_update_post_hook(commands);
1526 if (auto_gc) {
1527 const char *argv_gc_auto[] = {
1528 "gc", "--auto", "--quiet", NULL,
1529 };
1530 int opt = RUN_GIT_CMD | RUN_COMMAND_STDOUT_TO_STDERR;
1531 run_command_v_opt(argv_gc_auto, opt);
1532 }
1533 if (auto_update_server_info)
1534 update_server_info(0);
1535 clear_shallow_info(&si);
1536 }
1537 if (use_sideband)
1538 packet_flush(1);
1539 sha1_array_clear(&shallow);
1540 sha1_array_clear(&ref);
1541 free((void *)push_cert_nonce);
1542 return 0;
1543}