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 prepare_push_cert_sha1(&proc);
531 if (use_sideband) {
533 memset(&muxer, 0, sizeof(muxer));
534 muxer.proc = copy_to_sideband;
535 muxer.in = -1;
536 code = start_async(&muxer);
537 if (code)
538 return code;
539 proc.err = muxer.in;
540 }
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, &err) ||
851 ref_transaction_commit(transaction, "push", &err)) {
852 ref_transaction_free(transaction);
853 rp_error("%s", err.buf);
855 strbuf_release(&err);
856 return "failed to update ref";
857 }
858 ref_transaction_free(transaction);
860 strbuf_release(&err);
861 return NULL; /* good */
862 }
863}
864static void run_update_post_hook(struct command *commands)
866{
867 struct command *cmd;
868 int argc;
869 const char **argv;
870 struct child_process proc = CHILD_PROCESS_INIT;
871 char *hook;
872 hook = find_hook("post-update");
874 for (argc = 0, cmd = commands; cmd; cmd = cmd->next) {
875 if (cmd->error_string || cmd->did_not_exist)
876 continue;
877 argc++;
878 }
879 if (!argc || !hook)
880 return;
881 argv = xmalloc(sizeof(*argv) * (2 + argc));
883 argv[0] = hook;
884 for (argc = 1, cmd = commands; cmd; cmd = cmd->next) {
886 if (cmd->error_string || cmd->did_not_exist)
887 continue;
888 argv[argc] = xstrdup(cmd->ref_name);
889 argc++;
890 }
891 argv[argc] = NULL;
892 proc.no_stdin = 1;
894 proc.stdout_to_stderr = 1;
895 proc.err = use_sideband ? -1 : 0;
896 proc.argv = argv;
897 if (!start_command(&proc)) {
899 if (use_sideband)
900 copy_to_sideband(proc.err, -1, NULL);
901 finish_command(&proc);
902 }
903}
904static void check_aliased_update(struct command *cmd, struct string_list *list)
906{
907 struct strbuf buf = STRBUF_INIT;
908 const char *dst_name;
909 struct string_list_item *item;
910 struct command *dst_cmd;
911 unsigned char sha1[20];
912 char cmd_oldh[41], cmd_newh[41], dst_oldh[41], dst_newh[41];
913 int flag;
914 strbuf_addf(&buf, "%s%s", get_git_namespace(), cmd->ref_name);
916 dst_name = resolve_ref_unsafe(buf.buf, sha1, 0, &flag);
917 strbuf_release(&buf);
918 if (!(flag & REF_ISSYMREF))
920 return;
921 dst_name = strip_namespace(dst_name);
923 if (!dst_name) {
924 rp_error("refusing update to broken symref '%s'", cmd->ref_name);
925 cmd->skip_update = 1;
926 cmd->error_string = "broken symref";
927 return;
928 }
929 if ((item = string_list_lookup(list, dst_name)) == NULL)
931 return;
932 cmd->skip_update = 1;
934 dst_cmd = (struct command *) item->util;
936 if (!hashcmp(cmd->old_sha1, dst_cmd->old_sha1) &&
938 !hashcmp(cmd->new_sha1, dst_cmd->new_sha1))
939 return;
940 dst_cmd->skip_update = 1;
942 strcpy(cmd_oldh, find_unique_abbrev(cmd->old_sha1, DEFAULT_ABBREV));
944 strcpy(cmd_newh, find_unique_abbrev(cmd->new_sha1, DEFAULT_ABBREV));
945 strcpy(dst_oldh, find_unique_abbrev(dst_cmd->old_sha1, DEFAULT_ABBREV));
946 strcpy(dst_newh, find_unique_abbrev(dst_cmd->new_sha1, DEFAULT_ABBREV));
947 rp_error("refusing inconsistent update between symref '%s' (%s..%s) and"
948 " its target '%s' (%s..%s)",
949 cmd->ref_name, cmd_oldh, cmd_newh,
950 dst_cmd->ref_name, dst_oldh, dst_newh);
951 cmd->error_string = dst_cmd->error_string =
953 "inconsistent aliased update";
954}
955static void check_aliased_updates(struct command *commands)
957{
958 struct command *cmd;
959 struct string_list ref_list = STRING_LIST_INIT_NODUP;
960 for (cmd = commands; cmd; cmd = cmd->next) {
962 struct string_list_item *item =
963 string_list_append(&ref_list, cmd->ref_name);
964 item->util = (void *)cmd;
965 }
966 sort_string_list(&ref_list);
967 for (cmd = commands; cmd; cmd = cmd->next) {
969 if (!cmd->error_string)
970 check_aliased_update(cmd, &ref_list);
971 }
972 string_list_clear(&ref_list, 0);
974}
975static int command_singleton_iterator(void *cb_data, unsigned char sha1[20])
977{
978 struct command **cmd_list = cb_data;
979 struct command *cmd = *cmd_list;
980 if (!cmd || is_null_sha1(cmd->new_sha1))
982 return -1; /* end of list */
983 *cmd_list = NULL; /* this returns only one */
984 hashcpy(sha1, cmd->new_sha1);
985 return 0;
986}
987static void set_connectivity_errors(struct command *commands,
989 struct shallow_info *si)
990{
991 struct command *cmd;
992 for (cmd = commands; cmd; cmd = cmd->next) {
994 struct command *singleton = cmd;
995 if (shallow_update && si->shallow_ref[cmd->index])
996 /* to be checked in update_shallow_ref() */
997 continue;
998 if (!check_everything_connected(command_singleton_iterator,
999 0, &singleton))
1000 continue;
1001 cmd->error_string = "missing necessary objects";
1002 }
1003}
1004struct iterate_data {
1006 struct command *cmds;
1007 struct shallow_info *si;
1008};
1009static int iterate_receive_command_list(void *cb_data, unsigned char sha1[20])
1011{
1012 struct iterate_data *data = cb_data;
1013 struct command **cmd_list = &data->cmds;
1014 struct command *cmd = *cmd_list;
1015 for (; cmd; cmd = cmd->next) {
1017 if (shallow_update && data->si->shallow_ref[cmd->index])
1018 /* to be checked in update_shallow_ref() */
1019 continue;
1020 if (!is_null_sha1(cmd->new_sha1) && !cmd->skip_update) {
1021 hashcpy(sha1, cmd->new_sha1);
1022 *cmd_list = cmd->next;
1023 return 0;
1024 }
1025 }
1026 *cmd_list = NULL;
1027 return -1; /* end of list */
1028}
1029static void reject_updates_to_hidden(struct command *commands)
1031{
1032 struct command *cmd;
1033 for (cmd = commands; cmd; cmd = cmd->next) {
1035 if (cmd->error_string || !ref_is_hidden(cmd->ref_name))
1036 continue;
1037 if (is_null_sha1(cmd->new_sha1))
1038 cmd->error_string = "deny deleting a hidden ref";
1039 else
1040 cmd->error_string = "deny updating a hidden ref";
1041 }
1042}
1043static void execute_commands(struct command *commands,
1045 const char *unpacker_error,
1046 struct shallow_info *si)
1047{
1048 int checked_connectivity;
1049 struct command *cmd;
1050 unsigned char sha1[20];
1051 struct iterate_data data;
1052 if (unpacker_error) {
1054 for (cmd = commands; cmd; cmd = cmd->next)
1055 cmd->error_string = "unpacker error";
1056 return;
1057 }
1058 data.cmds = commands;
1060 data.si = si;
1061 if (check_everything_connected(iterate_receive_command_list, 0, &data))
1062 set_connectivity_errors(commands, si);
1063 reject_updates_to_hidden(commands);
1065 if (run_receive_hook(commands, "pre-receive", 0)) {
1067 for (cmd = commands; cmd; cmd = cmd->next) {
1068 if (!cmd->error_string)
1069 cmd->error_string = "pre-receive hook declined";
1070 }
1071 return;
1072 }
1073 check_aliased_updates(commands);
1075 free(head_name_to_free);
1077 head_name = head_name_to_free = resolve_refdup("HEAD", sha1, 0, NULL);
1078 checked_connectivity = 1;
1080 for (cmd = commands; cmd; cmd = cmd->next) {
1081 if (cmd->error_string)
1082 continue;
1083 if (cmd->skip_update)
1085 continue;
1086 cmd->error_string = update(cmd, si);
1088 if (shallow_update && !cmd->error_string &&
1089 si->shallow_ref[cmd->index]) {
1090 error("BUG: connectivity check has not been run on ref %s",
1091 cmd->ref_name);
1092 checked_connectivity = 0;
1093 }
1094 }
1095 if (shallow_update && !checked_connectivity)
1097 error("BUG: run 'git fsck' for safety.\n"
1098 "If there are errors, try to remove "
1099 "the reported refs above");
1100}
1101static struct command **queue_command(struct command **tail,
1103 const char *line,
1104 int linelen)
1105{
1106 unsigned char old_sha1[20], new_sha1[20];
1107 struct command *cmd;
1108 const char *refname;
1109 int reflen;
1110 if (linelen < 83 ||
1112 line[40] != ' ' ||
1113 line[81] != ' ' ||
1114 get_sha1_hex(line, old_sha1) ||
1115 get_sha1_hex(line + 41, new_sha1))
1116 die("protocol error: expected old/new/ref, got '%s'", line);
1117 refname = line + 82;
1119 reflen = linelen - 82;
1120 cmd = xcalloc(1, sizeof(struct command) + reflen + 1);
1121 hashcpy(cmd->old_sha1, old_sha1);
1122 hashcpy(cmd->new_sha1, new_sha1);
1123 memcpy(cmd->ref_name, refname, reflen);
1124 cmd->ref_name[reflen] = '\0';
1125 *tail = cmd;
1126 return &cmd->next;
1127}
1128static void queue_commands_from_cert(struct command **tail,
1130 struct strbuf *push_cert)
1131{
1132 const char *boc, *eoc;
1133 if (*tail)
1135 die("protocol error: got both push certificate and unsigned commands");
1136 boc = strstr(push_cert->buf, "\n\n");
1138 if (!boc)
1139 die("malformed push certificate %.*s", 100, push_cert->buf);
1140 else
1141 boc += 2;
1142 eoc = push_cert->buf + parse_signature(push_cert->buf, push_cert->len);
1143 while (boc < eoc) {
1145 const char *eol = memchr(boc, '\n', eoc - boc);
1146 tail = queue_command(tail, boc, eol ? eol - boc : eoc - eol);
1147 boc = eol ? eol + 1 : eoc;
1148 }
1149}
1150static struct command *read_head_info(struct sha1_array *shallow)
1152{
1153 struct command *commands = NULL;
1154 struct command **p = &commands;
1155 for (;;) {
1156 char *line;
1157 int len, linelen;
1158 line = packet_read_line(0, &len);
1160 if (!line)
1161 break;
1162 if (len == 48 && starts_with(line, "shallow ")) {
1164 unsigned char sha1[20];
1165 if (get_sha1_hex(line + 8, sha1))
1166 die("protocol error: expected shallow sha, got '%s'",
1167 line + 8);
1168 sha1_array_append(shallow, sha1);
1169 continue;
1170 }
1171 linelen = strlen(line);
1173 if (linelen < len) {
1174 const char *feature_list = line + linelen + 1;
1175 if (parse_feature_request(feature_list, "report-status"))
1176 report_status = 1;
1177 if (parse_feature_request(feature_list, "side-band-64k"))
1178 use_sideband = LARGE_PACKET_MAX;
1179 if (parse_feature_request(feature_list, "quiet"))
1180 quiet = 1;
1181 }
1182 if (!strcmp(line, "push-cert")) {
1184 int true_flush = 0;
1185 char certbuf[1024];
1186 for (;;) {
1188 len = packet_read(0, NULL, NULL,
1189 certbuf, sizeof(certbuf), 0);
1190 if (!len) {
1191 true_flush = 1;
1192 break;
1193 }
1194 if (!strcmp(certbuf, "push-cert-end\n"))
1195 break; /* end of cert */
1196 strbuf_addstr(&push_cert, certbuf);
1197 }
1198 if (true_flush)
1200 break;
1201 continue;
1202 }
1203 p = queue_command(p, line, linelen);
1205 }
1206 if (push_cert.len)
1208 queue_commands_from_cert(p, &push_cert);
1209 return commands;
1211}
1212static const char *parse_pack_header(struct pack_header *hdr)
1214{
1215 switch (read_pack_header(0, hdr)) {
1216 case PH_ERROR_EOF:
1217 return "eof before pack header was fully read";
1218 case PH_ERROR_PACK_SIGNATURE:
1220 return "protocol error (pack signature mismatch detected)";
1221 case PH_ERROR_PROTOCOL:
1223 return "protocol error (pack version unsupported)";
1224 default:
1226 return "unknown error in parse_pack_header";
1227 case 0:
1229 return NULL;
1230 }
1231}
1232static const char *pack_lockfile;
1234static const char *unpack(int err_fd, struct shallow_info *si)
1236{
1237 struct pack_header hdr;
1238 struct argv_array av = ARGV_ARRAY_INIT;
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_pushl(&av, "--shallow-file", alt_shallow_file, NULL);
1262 }
1263 if (ntohl(hdr.hdr_entries) < unpack_limit) {
1265 argv_array_pushl(&av, "unpack-objects", hdr_arg, NULL);
1266 if (quiet)
1267 argv_array_push(&av, "-q");
1268 if (fsck_objects)
1269 argv_array_push(&av, "--strict");
1270 child.argv = av.argv;
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(&av, "index-pack",
1286 "--stdin", hdr_arg, keep_arg, NULL);
1287 if (fsck_objects)
1288 argv_array_push(&av, "--strict");
1289 if (fix_thin)
1290 argv_array_push(&av, "--fix-thin");
1291 child.argv = av.argv;
1292 child.out = -1;
1293 child.err = err_fd;
1294 child.git_cmd = 1;
1295 status = start_command(&child);
1296 if (status)
1297 return "index-pack fork failed";
1298 pack_lockfile = index_pack_lockfile(child.out);
1299 close(child.out);
1300 status = finish_command(&child);
1301 if (status)
1302 return "index-pack abnormal exit";
1303 reprepare_packed_git();
1304 }
1305 return NULL;
1306}
1307static const char *unpack_with_sideband(struct shallow_info *si)
1309{
1310 struct async muxer;
1311 const char *ret;
1312 if (!use_sideband)
1314 return unpack(0, si);
1315 memset(&muxer, 0, sizeof(muxer));
1317 muxer.proc = copy_to_sideband;
1318 muxer.in = -1;
1319 if (start_async(&muxer))
1320 return NULL;
1321 ret = unpack(muxer.in, si);
1323 finish_async(&muxer);
1325 return ret;
1326}
1327static void prepare_shallow_update(struct command *commands,
1329 struct shallow_info *si)
1330{
1331 int i, j, k, bitmap_size = (si->ref->nr + 31) / 32;
1332 si->used_shallow = xmalloc(sizeof(*si->used_shallow) *
1334 si->shallow->nr);
1335 assign_shallow_commits_to_refs(si, si->used_shallow, NULL);
1336 si->need_reachability_test =
1338 xcalloc(si->shallow->nr, sizeof(*si->need_reachability_test));
1339 si->reachable =
1340 xcalloc(si->shallow->nr, sizeof(*si->reachable));
1341 si->shallow_ref = xcalloc(si->ref->nr, sizeof(*si->shallow_ref));
1342 for (i = 0; i < si->nr_ours; i++)
1344 si->need_reachability_test[si->ours[i]] = 1;
1345 for (i = 0; i < si->shallow->nr; i++) {
1347 if (!si->used_shallow[i])
1348 continue;
1349 for (j = 0; j < bitmap_size; j++) {
1350 if (!si->used_shallow[i][j])
1351 continue;
1352 si->need_reachability_test[i]++;
1353 for (k = 0; k < 32; k++)
1354 if (si->used_shallow[i][j] & (1 << k))
1355 si->shallow_ref[j * 32 + k]++;
1356 }
1357 /*
1359 * true for those associated with some refs and belong
1360 * in "ours" list aka "step 7 not done yet"
1361 */
1362 si->need_reachability_test[i] =
1363 si->need_reachability_test[i] > 1;
1364 }
1365 /*
1367 * keep hooks happy by forcing a temporary shallow file via
1368 * env variable because we can't add --shallow-file to every
1369 * command. check_everything_connected() will be done with
1370 * true .git/shallow though.
1371 */
1372 setenv(GIT_SHALLOW_FILE_ENVIRONMENT, alt_shallow_file, 1);
1373}
1374static void update_shallow_info(struct command *commands,
1376 struct shallow_info *si,
1377 struct sha1_array *ref)
1378{
1379 struct command *cmd;
1380 int *ref_status;
1381 remove_nonexistent_theirs_shallow(si);
1382 if (!si->nr_ours && !si->nr_theirs) {
1383 shallow_update = 0;
1384 return;
1385 }
1386 for (cmd = commands; cmd; cmd = cmd->next) {
1388 if (is_null_sha1(cmd->new_sha1))
1389 continue;
1390 sha1_array_append(ref, cmd->new_sha1);
1391 cmd->index = ref->nr - 1;
1392 }
1393 si->ref = ref;
1394 if (shallow_update) {
1396 prepare_shallow_update(commands, si);
1397 return;
1398 }
1399 ref_status = xmalloc(sizeof(*ref_status) * ref->nr);
1401 assign_shallow_commits_to_refs(si, NULL, ref_status);
1402 for (cmd = commands; cmd; cmd = cmd->next) {
1403 if (is_null_sha1(cmd->new_sha1))
1404 continue;
1405 if (ref_status[cmd->index]) {
1406 cmd->error_string = "shallow update not allowed";
1407 cmd->skip_update = 1;
1408 }
1409 }
1410 free(ref_status);
1411}
1412static void report(struct command *commands, const char *unpack_status)
1414{
1415 struct command *cmd;
1416 struct strbuf buf = STRBUF_INIT;
1417 packet_buf_write(&buf, "unpack %s\n",
1419 unpack_status ? unpack_status : "ok");
1420 for (cmd = commands; cmd; cmd = cmd->next) {
1421 if (!cmd->error_string)
1422 packet_buf_write(&buf, "ok %s\n",
1423 cmd->ref_name);
1424 else
1425 packet_buf_write(&buf, "ng %s %s\n",
1426 cmd->ref_name, cmd->error_string);
1427 }
1428 packet_buf_flush(&buf);
1429 if (use_sideband)
1431 send_sideband(1, 1, buf.buf, buf.len, use_sideband);
1432 else
1433 write_or_die(1, buf.buf, buf.len);
1434 strbuf_release(&buf);
1435}
1436static int delete_only(struct command *commands)
1438{
1439 struct command *cmd;
1440 for (cmd = commands; cmd; cmd = cmd->next) {
1441 if (!is_null_sha1(cmd->new_sha1))
1442 return 0;
1443 }
1444 return 1;
1445}
1446int cmd_receive_pack(int argc, const char **argv, const char *prefix)
1448{
1449 int advertise_refs = 0;
1450 int i;
1451 struct command *commands;
1452 struct sha1_array shallow = SHA1_ARRAY_INIT;
1453 struct sha1_array ref = SHA1_ARRAY_INIT;
1454 struct shallow_info si;
1455 packet_trace_identity("receive-pack");
1457 argv++;
1459 for (i = 1; i < argc; i++) {
1460 const char *arg = *argv++;
1461 if (*arg == '-') {
1463 if (!strcmp(arg, "--quiet")) {
1464 quiet = 1;
1465 continue;
1466 }
1467 if (!strcmp(arg, "--advertise-refs")) {
1469 advertise_refs = 1;
1470 continue;
1471 }
1472 if (!strcmp(arg, "--stateless-rpc")) {
1473 stateless_rpc = 1;
1474 continue;
1475 }
1476 if (!strcmp(arg, "--reject-thin-pack-for-testing")) {
1477 fix_thin = 0;
1478 continue;
1479 }
1480 usage(receive_pack_usage);
1482 }
1483 if (service_dir)
1484 usage(receive_pack_usage);
1485 service_dir = arg;
1486 }
1487 if (!service_dir)
1488 usage(receive_pack_usage);
1489 setup_path();
1491 if (!enter_repo(service_dir, 0))
1493 die("'%s' does not appear to be a git repository", service_dir);
1494 git_config(receive_pack_config, NULL);
1496 if (cert_nonce_seed)
1497 push_cert_nonce = prepare_push_cert_nonce(service_dir, time(NULL));
1498 if (0 <= transfer_unpack_limit)
1500 unpack_limit = transfer_unpack_limit;
1501 else if (0 <= receive_unpack_limit)
1502 unpack_limit = receive_unpack_limit;
1503 if (advertise_refs || !stateless_rpc) {
1505 write_head_info();
1506 }
1507 if (advertise_refs)
1508 return 0;
1509 if ((commands = read_head_info(&shallow)) != NULL) {
1511 const char *unpack_status = NULL;
1512 prepare_shallow_info(&si, &shallow);
1514 if (!si.nr_ours && !si.nr_theirs)
1515 shallow_update = 0;
1516 if (!delete_only(commands)) {
1517 unpack_status = unpack_with_sideband(&si);
1518 update_shallow_info(commands, &si, &ref);
1519 }
1520 execute_commands(commands, unpack_status, &si);
1521 if (pack_lockfile)
1522 unlink_or_warn(pack_lockfile);
1523 if (report_status)
1524 report(commands, unpack_status);
1525 run_receive_hook(commands, "post-receive", 1);
1526 run_update_post_hook(commands);
1527 if (auto_gc) {
1528 const char *argv_gc_auto[] = {
1529 "gc", "--auto", "--quiet", NULL,
1530 };
1531 int opt = RUN_GIT_CMD | RUN_COMMAND_STDOUT_TO_STDERR;
1532 run_command_v_opt(argv_gc_auto, opt);
1533 }
1534 if (auto_update_server_info)
1535 update_server_info(0);
1536 clear_shallow_info(&si);
1537 }
1538 if (use_sideband)
1539 packet_flush(1);
1540 sha1_array_clear(&shallow);
1541 sha1_array_clear(&ref);
1542 free((void *)push_cert_nonce);
1543 return 0;
1544}