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 struct argv_array env = ARGV_ARRAY_INIT;
457 if (!push_cert.len)
459 return;
460 if (!already_done) {
462 struct strbuf gpg_output = STRBUF_INIT;
463 struct strbuf gpg_status = STRBUF_INIT;
464 int bogs /* beginning_of_gpg_sig */;
465 already_done = 1;
467 if (write_sha1_file(push_cert.buf, push_cert.len, "blob", push_cert_sha1))
468 hashclr(push_cert_sha1);
469 memset(&sigcheck, '\0', sizeof(sigcheck));
471 sigcheck.result = 'N';
472 bogs = parse_signature(push_cert.buf, push_cert.len);
474 if (verify_signed_buffer(push_cert.buf, bogs,
475 push_cert.buf + bogs, push_cert.len - bogs,
476 &gpg_output, &gpg_status) < 0) {
477 ; /* error running gpg */
478 } else {
479 sigcheck.payload = push_cert.buf;
480 sigcheck.gpg_output = gpg_output.buf;
481 sigcheck.gpg_status = gpg_status.buf;
482 parse_gpg_output(&sigcheck);
483 }
484 strbuf_release(&gpg_output);
486 strbuf_release(&gpg_status);
487 nonce_status = check_nonce(push_cert.buf, bogs);
488 }
489 if (!is_null_sha1(push_cert_sha1)) {
490 argv_array_pushf(&env, "GIT_PUSH_CERT=%s", sha1_to_hex(push_cert_sha1));
491 argv_array_pushf(&env, "GIT_PUSH_CERT_SIGNER=%s",
492 sigcheck.signer ? sigcheck.signer : "");
493 argv_array_pushf(&env, "GIT_PUSH_CERT_KEY=%s",
494 sigcheck.key ? sigcheck.key : "");
495 argv_array_pushf(&env, "GIT_PUSH_CERT_STATUS=%c", sigcheck.result);
496 if (push_cert_nonce) {
497 argv_array_pushf(&env, "GIT_PUSH_CERT_NONCE=%s", push_cert_nonce);
498 argv_array_pushf(&env, "GIT_PUSH_CERT_NONCE_STATUS=%s", nonce_status);
499 if (nonce_status == NONCE_SLOP)
500 argv_array_pushf(&env, "GIT_PUSH_CERT_NONCE_SLOP=%ld",
501 nonce_stamp_slop);
502 }
503 proc->env = env.argv;
504 }
505}
506typedef int (*feed_fn)(void *, const char **, size_t *);
508static int run_and_feed_hook(const char *hook_name, feed_fn feed, void *feed_state)
509{
510 struct child_process proc = CHILD_PROCESS_INIT;
511 struct async muxer;
512 const char *argv[2];
513 int code;
514 argv[0] = find_hook(hook_name);
516 if (!argv[0])
517 return 0;
518 argv[1] = NULL;
520 proc.argv = argv;
522 proc.in = -1;
523 proc.stdout_to_stderr = 1;
524 prepare_push_cert_sha1(&proc);
526 if (use_sideband) {
528 memset(&muxer, 0, sizeof(muxer));
529 muxer.proc = copy_to_sideband;
530 muxer.in = -1;
531 code = start_async(&muxer);
532 if (code)
533 return code;
534 proc.err = muxer.in;
535 }
536 code = start_command(&proc);
538 if (code) {
539 if (use_sideband)
540 finish_async(&muxer);
541 return code;
542 }
543 sigchain_push(SIGPIPE, SIG_IGN);
545 while (1) {
547 const char *buf;
548 size_t n;
549 if (feed(feed_state, &buf, &n))
550 break;
551 if (write_in_full(proc.in, buf, n) != n)
552 break;
553 }
554 close(proc.in);
555 if (use_sideband)
556 finish_async(&muxer);
557 sigchain_pop(SIGPIPE);
559 return finish_command(&proc);
561}
562struct receive_hook_feed_state {
564 struct command *cmd;
565 int skip_broken;
566 struct strbuf buf;
567};
568static int feed_receive_hook(void *state_, const char **bufp, size_t *sizep)
570{
571 struct receive_hook_feed_state *state = state_;
572 struct command *cmd = state->cmd;
573 while (cmd &&
575 state->skip_broken && (cmd->error_string || cmd->did_not_exist))
576 cmd = cmd->next;
577 if (!cmd)
578 return -1; /* EOF */
579 strbuf_reset(&state->buf);
580 strbuf_addf(&state->buf, "%s %s %s\n",
581 sha1_to_hex(cmd->old_sha1), sha1_to_hex(cmd->new_sha1),
582 cmd->ref_name);
583 state->cmd = cmd->next;
584 if (bufp) {
585 *bufp = state->buf.buf;
586 *sizep = state->buf.len;
587 }
588 return 0;
589}
590static int run_receive_hook(struct command *commands, const char *hook_name,
592 int skip_broken)
593{
594 struct receive_hook_feed_state state;
595 int status;
596 strbuf_init(&state.buf, 0);
598 state.cmd = commands;
599 state.skip_broken = skip_broken;
600 if (feed_receive_hook(&state, NULL, NULL))
601 return 0;
602 state.cmd = commands;
603 status = run_and_feed_hook(hook_name, feed_receive_hook, &state);
604 strbuf_release(&state.buf);
605 return status;
606}
607static int run_update_hook(struct command *cmd)
609{
610 const char *argv[5];
611 struct child_process proc = CHILD_PROCESS_INIT;
612 int code;
613 argv[0] = find_hook("update");
615 if (!argv[0])
616 return 0;
617 argv[1] = cmd->ref_name;
619 argv[2] = sha1_to_hex(cmd->old_sha1);
620 argv[3] = sha1_to_hex(cmd->new_sha1);
621 argv[4] = NULL;
622 proc.no_stdin = 1;
624 proc.stdout_to_stderr = 1;
625 proc.err = use_sideband ? -1 : 0;
626 proc.argv = argv;
627 code = start_command(&proc);
629 if (code)
630 return code;
631 if (use_sideband)
632 copy_to_sideband(proc.err, -1, NULL);
633 return finish_command(&proc);
634}
635static int is_ref_checked_out(const char *ref)
637{
638 if (is_bare_repository())
639 return 0;
640 if (!head_name)
642 return 0;
643 return !strcmp(head_name, ref);
644}
645static char *refuse_unconfigured_deny_msg[] = {
647 "By default, updating the current branch in a non-bare repository",
648 "is denied, because it will make the index and work tree inconsistent",
649 "with what you pushed, and will require 'git reset --hard' to match",
650 "the work tree to HEAD.",
651 "",
652 "You can set 'receive.denyCurrentBranch' configuration variable to",
653 "'ignore' or 'warn' in the remote repository to allow pushing into",
654 "its current branch; however, this is not recommended unless you",
655 "arranged to update its work tree to match what you pushed in some",
656 "other way.",
657 "",
658 "To squelch this message and still keep the default behaviour, set",
659 "'receive.denyCurrentBranch' configuration variable to 'refuse'."
660};
661static void refuse_unconfigured_deny(void)
663{
664 int i;
665 for (i = 0; i < ARRAY_SIZE(refuse_unconfigured_deny_msg); i++)
666 rp_error("%s", refuse_unconfigured_deny_msg[i]);
667}
668static char *refuse_unconfigured_deny_delete_current_msg[] = {
670 "By default, deleting the current branch is denied, because the next",
671 "'git clone' won't result in any file checked out, causing confusion.",
672 "",
673 "You can set 'receive.denyDeleteCurrent' configuration variable to",
674 "'warn' or 'ignore' in the remote repository to allow deleting the",
675 "current branch, with or without a warning message.",
676 "",
677 "To squelch this message, you can set it to 'refuse'."
678};
679static void refuse_unconfigured_deny_delete_current(void)
681{
682 int i;
683 for (i = 0;
684 i < ARRAY_SIZE(refuse_unconfigured_deny_delete_current_msg);
685 i++)
686 rp_error("%s", refuse_unconfigured_deny_delete_current_msg[i]);
687}
688static int command_singleton_iterator(void *cb_data, unsigned char sha1[20]);
690static int update_shallow_ref(struct command *cmd, struct shallow_info *si)
691{
692 static struct lock_file shallow_lock;
693 struct sha1_array extra = SHA1_ARRAY_INIT;
694 const char *alt_file;
695 uint32_t mask = 1 << (cmd->index % 32);
696 int i;
697 trace_printf_key(&trace_shallow,
699 "shallow: update_shallow_ref %s\n", cmd->ref_name);
700 for (i = 0; i < si->shallow->nr; i++)
701 if (si->used_shallow[i] &&
702 (si->used_shallow[i][cmd->index / 32] & mask) &&
703 !delayed_reachability_test(si, i))
704 sha1_array_append(&extra, si->shallow->sha1[i]);
705 setup_alternate_shallow(&shallow_lock, &alt_file, &extra);
707 if (check_shallow_connected(command_singleton_iterator,
708 0, cmd, alt_file)) {
709 rollback_lock_file(&shallow_lock);
710 sha1_array_clear(&extra);
711 return -1;
712 }
713 commit_lock_file(&shallow_lock);
715 /*
717 * Make sure setup_alternate_shallow() for the next ref does
718 * not lose these new roots..
719 */
720 for (i = 0; i < extra.nr; i++)
721 register_shallow(extra.sha1[i]);
722 si->shallow_ref[cmd->index] = 0;
724 sha1_array_clear(&extra);
725 return 0;
726}
727static const char *update(struct command *cmd, struct shallow_info *si)
729{
730 const char *name = cmd->ref_name;
731 struct strbuf namespaced_name_buf = STRBUF_INIT;
732 const char *namespaced_name;
733 unsigned char *old_sha1 = cmd->old_sha1;
734 unsigned char *new_sha1 = cmd->new_sha1;
735 /* only refs/... are allowed */
737 if (!starts_with(name, "refs/") || check_refname_format(name + 5, 0)) {
738 rp_error("refusing to create funny ref '%s' remotely", name);
739 return "funny refname";
740 }
741 strbuf_addf(&namespaced_name_buf, "%s%s", get_git_namespace(), name);
743 namespaced_name = strbuf_detach(&namespaced_name_buf, NULL);
744 if (is_ref_checked_out(namespaced_name)) {
746 switch (deny_current_branch) {
747 case DENY_IGNORE:
748 break;
749 case DENY_WARN:
750 rp_warning("updating the current branch");
751 break;
752 case DENY_REFUSE:
753 case DENY_UNCONFIGURED:
754 rp_error("refusing to update checked out branch: %s", name);
755 if (deny_current_branch == DENY_UNCONFIGURED)
756 refuse_unconfigured_deny();
757 return "branch is currently checked out";
758 }
759 }
760 if (!is_null_sha1(new_sha1) && !has_sha1_file(new_sha1)) {
762 error("unpack should have generated %s, "
763 "but I can't find it!", sha1_to_hex(new_sha1));
764 return "bad pack";
765 }
766 if (!is_null_sha1(old_sha1) && is_null_sha1(new_sha1)) {
768 if (deny_deletes && starts_with(name, "refs/heads/")) {
769 rp_error("denying ref deletion for %s", name);
770 return "deletion prohibited";
771 }
772 if (!strcmp(namespaced_name, head_name)) {
774 switch (deny_delete_current) {
775 case DENY_IGNORE:
776 break;
777 case DENY_WARN:
778 rp_warning("deleting the current branch");
779 break;
780 case DENY_REFUSE:
781 case DENY_UNCONFIGURED:
782 if (deny_delete_current == DENY_UNCONFIGURED)
783 refuse_unconfigured_deny_delete_current();
784 rp_error("refusing to delete the current branch: %s", name);
785 return "deletion of the current branch prohibited";
786 }
787 }
788 }
789 if (deny_non_fast_forwards && !is_null_sha1(new_sha1) &&
791 !is_null_sha1(old_sha1) &&
792 starts_with(name, "refs/heads/")) {
793 struct object *old_object, *new_object;
794 struct commit *old_commit, *new_commit;
795 old_object = parse_object(old_sha1);
797 new_object = parse_object(new_sha1);
798 if (!old_object || !new_object ||
800 old_object->type != OBJ_COMMIT ||
801 new_object->type != OBJ_COMMIT) {
802 error("bad sha1 objects for %s", name);
803 return "bad ref";
804 }
805 old_commit = (struct commit *)old_object;
806 new_commit = (struct commit *)new_object;
807 if (!in_merge_bases(old_commit, new_commit)) {
808 rp_error("denying non-fast-forward %s"
809 " (you should pull first)", name);
810 return "non-fast-forward";
811 }
812 }
813 if (run_update_hook(cmd)) {
814 rp_error("hook declined to update %s", name);
815 return "hook declined";
816 }
817 if (is_null_sha1(new_sha1)) {
819 if (!parse_object(old_sha1)) {
820 old_sha1 = NULL;
821 if (ref_exists(name)) {
822 rp_warning("Allowing deletion of corrupt ref.");
823 } else {
824 rp_warning("Deleting a non-existent ref.");
825 cmd->did_not_exist = 1;
826 }
827 }
828 if (delete_ref(namespaced_name, old_sha1, 0)) {
829 rp_error("failed to delete %s", name);
830 return "failed to delete";
831 }
832 return NULL; /* good */
833 }
834 else {
835 struct strbuf err = STRBUF_INIT;
836 struct ref_transaction *transaction;
837 if (shallow_update && si->shallow_ref[cmd->index] &&
839 update_shallow_ref(cmd, si))
840 return "shallow error";
841 transaction = ref_transaction_begin(&err);
843 if (!transaction ||
844 ref_transaction_update(transaction, namespaced_name,
845 new_sha1, old_sha1, 0, 1, &err) ||
846 ref_transaction_commit(transaction, "push", &err)) {
847 ref_transaction_free(transaction);
848 rp_error("%s", err.buf);
850 strbuf_release(&err);
851 return "failed to update ref";
852 }
853 ref_transaction_free(transaction);
855 strbuf_release(&err);
856 return NULL; /* good */
857 }
858}
859static void run_update_post_hook(struct command *commands)
861{
862 struct command *cmd;
863 int argc;
864 const char **argv;
865 struct child_process proc = CHILD_PROCESS_INIT;
866 char *hook;
867 hook = find_hook("post-update");
869 for (argc = 0, cmd = commands; cmd; cmd = cmd->next) {
870 if (cmd->error_string || cmd->did_not_exist)
871 continue;
872 argc++;
873 }
874 if (!argc || !hook)
875 return;
876 argv = xmalloc(sizeof(*argv) * (2 + argc));
878 argv[0] = hook;
879 for (argc = 1, cmd = commands; cmd; cmd = cmd->next) {
881 if (cmd->error_string || cmd->did_not_exist)
882 continue;
883 argv[argc] = xstrdup(cmd->ref_name);
884 argc++;
885 }
886 argv[argc] = NULL;
887 proc.no_stdin = 1;
889 proc.stdout_to_stderr = 1;
890 proc.err = use_sideband ? -1 : 0;
891 proc.argv = argv;
892 if (!start_command(&proc)) {
894 if (use_sideband)
895 copy_to_sideband(proc.err, -1, NULL);
896 finish_command(&proc);
897 }
898}
899static void check_aliased_update(struct command *cmd, struct string_list *list)
901{
902 struct strbuf buf = STRBUF_INIT;
903 const char *dst_name;
904 struct string_list_item *item;
905 struct command *dst_cmd;
906 unsigned char sha1[20];
907 char cmd_oldh[41], cmd_newh[41], dst_oldh[41], dst_newh[41];
908 int flag;
909 strbuf_addf(&buf, "%s%s", get_git_namespace(), cmd->ref_name);
911 dst_name = resolve_ref_unsafe(buf.buf, sha1, 0, &flag);
912 strbuf_release(&buf);
913 if (!(flag & REF_ISSYMREF))
915 return;
916 dst_name = strip_namespace(dst_name);
918 if (!dst_name) {
919 rp_error("refusing update to broken symref '%s'", cmd->ref_name);
920 cmd->skip_update = 1;
921 cmd->error_string = "broken symref";
922 return;
923 }
924 if ((item = string_list_lookup(list, dst_name)) == NULL)
926 return;
927 cmd->skip_update = 1;
929 dst_cmd = (struct command *) item->util;
931 if (!hashcmp(cmd->old_sha1, dst_cmd->old_sha1) &&
933 !hashcmp(cmd->new_sha1, dst_cmd->new_sha1))
934 return;
935 dst_cmd->skip_update = 1;
937 strcpy(cmd_oldh, find_unique_abbrev(cmd->old_sha1, DEFAULT_ABBREV));
939 strcpy(cmd_newh, find_unique_abbrev(cmd->new_sha1, DEFAULT_ABBREV));
940 strcpy(dst_oldh, find_unique_abbrev(dst_cmd->old_sha1, DEFAULT_ABBREV));
941 strcpy(dst_newh, find_unique_abbrev(dst_cmd->new_sha1, DEFAULT_ABBREV));
942 rp_error("refusing inconsistent update between symref '%s' (%s..%s) and"
943 " its target '%s' (%s..%s)",
944 cmd->ref_name, cmd_oldh, cmd_newh,
945 dst_cmd->ref_name, dst_oldh, dst_newh);
946 cmd->error_string = dst_cmd->error_string =
948 "inconsistent aliased update";
949}
950static void check_aliased_updates(struct command *commands)
952{
953 struct command *cmd;
954 struct string_list ref_list = STRING_LIST_INIT_NODUP;
955 for (cmd = commands; cmd; cmd = cmd->next) {
957 struct string_list_item *item =
958 string_list_append(&ref_list, cmd->ref_name);
959 item->util = (void *)cmd;
960 }
961 sort_string_list(&ref_list);
962 for (cmd = commands; cmd; cmd = cmd->next) {
964 if (!cmd->error_string)
965 check_aliased_update(cmd, &ref_list);
966 }
967 string_list_clear(&ref_list, 0);
969}
970static int command_singleton_iterator(void *cb_data, unsigned char sha1[20])
972{
973 struct command **cmd_list = cb_data;
974 struct command *cmd = *cmd_list;
975 if (!cmd || is_null_sha1(cmd->new_sha1))
977 return -1; /* end of list */
978 *cmd_list = NULL; /* this returns only one */
979 hashcpy(sha1, cmd->new_sha1);
980 return 0;
981}
982static void set_connectivity_errors(struct command *commands,
984 struct shallow_info *si)
985{
986 struct command *cmd;
987 for (cmd = commands; cmd; cmd = cmd->next) {
989 struct command *singleton = cmd;
990 if (shallow_update && si->shallow_ref[cmd->index])
991 /* to be checked in update_shallow_ref() */
992 continue;
993 if (!check_everything_connected(command_singleton_iterator,
994 0, &singleton))
995 continue;
996 cmd->error_string = "missing necessary objects";
997 }
998}
999struct iterate_data {
1001 struct command *cmds;
1002 struct shallow_info *si;
1003};
1004static int iterate_receive_command_list(void *cb_data, unsigned char sha1[20])
1006{
1007 struct iterate_data *data = cb_data;
1008 struct command **cmd_list = &data->cmds;
1009 struct command *cmd = *cmd_list;
1010 for (; cmd; cmd = cmd->next) {
1012 if (shallow_update && data->si->shallow_ref[cmd->index])
1013 /* to be checked in update_shallow_ref() */
1014 continue;
1015 if (!is_null_sha1(cmd->new_sha1) && !cmd->skip_update) {
1016 hashcpy(sha1, cmd->new_sha1);
1017 *cmd_list = cmd->next;
1018 return 0;
1019 }
1020 }
1021 *cmd_list = NULL;
1022 return -1; /* end of list */
1023}
1024static void reject_updates_to_hidden(struct command *commands)
1026{
1027 struct command *cmd;
1028 for (cmd = commands; cmd; cmd = cmd->next) {
1030 if (cmd->error_string || !ref_is_hidden(cmd->ref_name))
1031 continue;
1032 if (is_null_sha1(cmd->new_sha1))
1033 cmd->error_string = "deny deleting a hidden ref";
1034 else
1035 cmd->error_string = "deny updating a hidden ref";
1036 }
1037}
1038static void execute_commands(struct command *commands,
1040 const char *unpacker_error,
1041 struct shallow_info *si)
1042{
1043 int checked_connectivity;
1044 struct command *cmd;
1045 unsigned char sha1[20];
1046 struct iterate_data data;
1047 if (unpacker_error) {
1049 for (cmd = commands; cmd; cmd = cmd->next)
1050 cmd->error_string = "unpacker error";
1051 return;
1052 }
1053 data.cmds = commands;
1055 data.si = si;
1056 if (check_everything_connected(iterate_receive_command_list, 0, &data))
1057 set_connectivity_errors(commands, si);
1058 reject_updates_to_hidden(commands);
1060 if (run_receive_hook(commands, "pre-receive", 0)) {
1062 for (cmd = commands; cmd; cmd = cmd->next) {
1063 if (!cmd->error_string)
1064 cmd->error_string = "pre-receive hook declined";
1065 }
1066 return;
1067 }
1068 check_aliased_updates(commands);
1070 free(head_name_to_free);
1072 head_name = head_name_to_free = resolve_refdup("HEAD", sha1, 0, NULL);
1073 checked_connectivity = 1;
1075 for (cmd = commands; cmd; cmd = cmd->next) {
1076 if (cmd->error_string)
1077 continue;
1078 if (cmd->skip_update)
1080 continue;
1081 cmd->error_string = update(cmd, si);
1083 if (shallow_update && !cmd->error_string &&
1084 si->shallow_ref[cmd->index]) {
1085 error("BUG: connectivity check has not been run on ref %s",
1086 cmd->ref_name);
1087 checked_connectivity = 0;
1088 }
1089 }
1090 if (shallow_update && !checked_connectivity)
1092 error("BUG: run 'git fsck' for safety.\n"
1093 "If there are errors, try to remove "
1094 "the reported refs above");
1095}
1096static struct command **queue_command(struct command **tail,
1098 const char *line,
1099 int linelen)
1100{
1101 unsigned char old_sha1[20], new_sha1[20];
1102 struct command *cmd;
1103 const char *refname;
1104 int reflen;
1105 if (linelen < 83 ||
1107 line[40] != ' ' ||
1108 line[81] != ' ' ||
1109 get_sha1_hex(line, old_sha1) ||
1110 get_sha1_hex(line + 41, new_sha1))
1111 die("protocol error: expected old/new/ref, got '%s'", line);
1112 refname = line + 82;
1114 reflen = linelen - 82;
1115 cmd = xcalloc(1, sizeof(struct command) + reflen + 1);
1116 hashcpy(cmd->old_sha1, old_sha1);
1117 hashcpy(cmd->new_sha1, new_sha1);
1118 memcpy(cmd->ref_name, refname, reflen);
1119 cmd->ref_name[reflen] = '\0';
1120 *tail = cmd;
1121 return &cmd->next;
1122}
1123static void queue_commands_from_cert(struct command **tail,
1125 struct strbuf *push_cert)
1126{
1127 const char *boc, *eoc;
1128 if (*tail)
1130 die("protocol error: got both push certificate and unsigned commands");
1131 boc = strstr(push_cert->buf, "\n\n");
1133 if (!boc)
1134 die("malformed push certificate %.*s", 100, push_cert->buf);
1135 else
1136 boc += 2;
1137 eoc = push_cert->buf + parse_signature(push_cert->buf, push_cert->len);
1138 while (boc < eoc) {
1140 const char *eol = memchr(boc, '\n', eoc - boc);
1141 tail = queue_command(tail, boc, eol ? eol - boc : eoc - eol);
1142 boc = eol ? eol + 1 : eoc;
1143 }
1144}
1145static struct command *read_head_info(struct sha1_array *shallow)
1147{
1148 struct command *commands = NULL;
1149 struct command **p = &commands;
1150 for (;;) {
1151 char *line;
1152 int len, linelen;
1153 line = packet_read_line(0, &len);
1155 if (!line)
1156 break;
1157 if (len == 48 && starts_with(line, "shallow ")) {
1159 unsigned char sha1[20];
1160 if (get_sha1_hex(line + 8, sha1))
1161 die("protocol error: expected shallow sha, got '%s'",
1162 line + 8);
1163 sha1_array_append(shallow, sha1);
1164 continue;
1165 }
1166 linelen = strlen(line);
1168 if (linelen < len) {
1169 const char *feature_list = line + linelen + 1;
1170 if (parse_feature_request(feature_list, "report-status"))
1171 report_status = 1;
1172 if (parse_feature_request(feature_list, "side-band-64k"))
1173 use_sideband = LARGE_PACKET_MAX;
1174 if (parse_feature_request(feature_list, "quiet"))
1175 quiet = 1;
1176 }
1177 if (!strcmp(line, "push-cert")) {
1179 int true_flush = 0;
1180 char certbuf[1024];
1181 for (;;) {
1183 len = packet_read(0, NULL, NULL,
1184 certbuf, sizeof(certbuf), 0);
1185 if (!len) {
1186 true_flush = 1;
1187 break;
1188 }
1189 if (!strcmp(certbuf, "push-cert-end\n"))
1190 break; /* end of cert */
1191 strbuf_addstr(&push_cert, certbuf);
1192 }
1193 if (true_flush)
1195 break;
1196 continue;
1197 }
1198 p = queue_command(p, line, linelen);
1200 }
1201 if (push_cert.len)
1203 queue_commands_from_cert(p, &push_cert);
1204 return commands;
1206}
1207static const char *parse_pack_header(struct pack_header *hdr)
1209{
1210 switch (read_pack_header(0, hdr)) {
1211 case PH_ERROR_EOF:
1212 return "eof before pack header was fully read";
1213 case PH_ERROR_PACK_SIGNATURE:
1215 return "protocol error (pack signature mismatch detected)";
1216 case PH_ERROR_PROTOCOL:
1218 return "protocol error (pack version unsupported)";
1219 default:
1221 return "unknown error in parse_pack_header";
1222 case 0:
1224 return NULL;
1225 }
1226}
1227static const char *pack_lockfile;
1229static const char *unpack(int err_fd, struct shallow_info *si)
1231{
1232 struct pack_header hdr;
1233 const char *hdr_err;
1234 int status;
1235 char hdr_arg[38];
1236 struct child_process child = CHILD_PROCESS_INIT;
1237 int fsck_objects = (receive_fsck_objects >= 0
1238 ? receive_fsck_objects
1239 : transfer_fsck_objects >= 0
1240 ? transfer_fsck_objects
1241 : 0);
1242 hdr_err = parse_pack_header(&hdr);
1244 if (hdr_err) {
1245 if (err_fd > 0)
1246 close(err_fd);
1247 return hdr_err;
1248 }
1249 snprintf(hdr_arg, sizeof(hdr_arg),
1250 "--pack_header=%"PRIu32",%"PRIu32,
1251 ntohl(hdr.hdr_version), ntohl(hdr.hdr_entries));
1252 if (si->nr_ours || si->nr_theirs) {
1254 alt_shallow_file = setup_temporary_shallow(si->shallow);
1255 argv_array_push(&child.args, "--shallow-file");
1256 argv_array_push(&child.args, alt_shallow_file);
1257 }
1258 if (ntohl(hdr.hdr_entries) < unpack_limit) {
1260 argv_array_pushl(&child.args, "unpack-objects", hdr_arg, NULL);
1261 if (quiet)
1262 argv_array_push(&child.args, "-q");
1263 if (fsck_objects)
1264 argv_array_push(&child.args, "--strict");
1265 child.no_stdout = 1;
1266 child.err = err_fd;
1267 child.git_cmd = 1;
1268 status = run_command(&child);
1269 if (status)
1270 return "unpack-objects abnormal exit";
1271 } else {
1272 int s;
1273 char keep_arg[256];
1274 s = sprintf(keep_arg, "--keep=receive-pack %"PRIuMAX" on ", (uintmax_t) getpid());
1276 if (gethostname(keep_arg + s, sizeof(keep_arg) - s))
1277 strcpy(keep_arg + s, "localhost");
1278 argv_array_pushl(&child.args, "index-pack",
1280 "--stdin", hdr_arg, keep_arg, NULL);
1281 if (fsck_objects)
1282 argv_array_push(&child.args, "--strict");
1283 if (fix_thin)
1284 argv_array_push(&child.args, "--fix-thin");
1285 child.out = -1;
1286 child.err = err_fd;
1287 child.git_cmd = 1;
1288 status = start_command(&child);
1289 if (status)
1290 return "index-pack fork failed";
1291 pack_lockfile = index_pack_lockfile(child.out);
1292 close(child.out);
1293 status = finish_command(&child);
1294 if (status)
1295 return "index-pack abnormal exit";
1296 reprepare_packed_git();
1297 }
1298 return NULL;
1299}
1300static const char *unpack_with_sideband(struct shallow_info *si)
1302{
1303 struct async muxer;
1304 const char *ret;
1305 if (!use_sideband)
1307 return unpack(0, si);
1308 memset(&muxer, 0, sizeof(muxer));
1310 muxer.proc = copy_to_sideband;
1311 muxer.in = -1;
1312 if (start_async(&muxer))
1313 return NULL;
1314 ret = unpack(muxer.in, si);
1316 finish_async(&muxer);
1318 return ret;
1319}
1320static void prepare_shallow_update(struct command *commands,
1322 struct shallow_info *si)
1323{
1324 int i, j, k, bitmap_size = (si->ref->nr + 31) / 32;
1325 si->used_shallow = xmalloc(sizeof(*si->used_shallow) *
1327 si->shallow->nr);
1328 assign_shallow_commits_to_refs(si, si->used_shallow, NULL);
1329 si->need_reachability_test =
1331 xcalloc(si->shallow->nr, sizeof(*si->need_reachability_test));
1332 si->reachable =
1333 xcalloc(si->shallow->nr, sizeof(*si->reachable));
1334 si->shallow_ref = xcalloc(si->ref->nr, sizeof(*si->shallow_ref));
1335 for (i = 0; i < si->nr_ours; i++)
1337 si->need_reachability_test[si->ours[i]] = 1;
1338 for (i = 0; i < si->shallow->nr; i++) {
1340 if (!si->used_shallow[i])
1341 continue;
1342 for (j = 0; j < bitmap_size; j++) {
1343 if (!si->used_shallow[i][j])
1344 continue;
1345 si->need_reachability_test[i]++;
1346 for (k = 0; k < 32; k++)
1347 if (si->used_shallow[i][j] & (1 << k))
1348 si->shallow_ref[j * 32 + k]++;
1349 }
1350 /*
1352 * true for those associated with some refs and belong
1353 * in "ours" list aka "step 7 not done yet"
1354 */
1355 si->need_reachability_test[i] =
1356 si->need_reachability_test[i] > 1;
1357 }
1358 /*
1360 * keep hooks happy by forcing a temporary shallow file via
1361 * env variable because we can't add --shallow-file to every
1362 * command. check_everything_connected() will be done with
1363 * true .git/shallow though.
1364 */
1365 setenv(GIT_SHALLOW_FILE_ENVIRONMENT, alt_shallow_file, 1);
1366}
1367static void update_shallow_info(struct command *commands,
1369 struct shallow_info *si,
1370 struct sha1_array *ref)
1371{
1372 struct command *cmd;
1373 int *ref_status;
1374 remove_nonexistent_theirs_shallow(si);
1375 if (!si->nr_ours && !si->nr_theirs) {
1376 shallow_update = 0;
1377 return;
1378 }
1379 for (cmd = commands; cmd; cmd = cmd->next) {
1381 if (is_null_sha1(cmd->new_sha1))
1382 continue;
1383 sha1_array_append(ref, cmd->new_sha1);
1384 cmd->index = ref->nr - 1;
1385 }
1386 si->ref = ref;
1387 if (shallow_update) {
1389 prepare_shallow_update(commands, si);
1390 return;
1391 }
1392 ref_status = xmalloc(sizeof(*ref_status) * ref->nr);
1394 assign_shallow_commits_to_refs(si, NULL, ref_status);
1395 for (cmd = commands; cmd; cmd = cmd->next) {
1396 if (is_null_sha1(cmd->new_sha1))
1397 continue;
1398 if (ref_status[cmd->index]) {
1399 cmd->error_string = "shallow update not allowed";
1400 cmd->skip_update = 1;
1401 }
1402 }
1403 free(ref_status);
1404}
1405static void report(struct command *commands, const char *unpack_status)
1407{
1408 struct command *cmd;
1409 struct strbuf buf = STRBUF_INIT;
1410 packet_buf_write(&buf, "unpack %s\n",
1412 unpack_status ? unpack_status : "ok");
1413 for (cmd = commands; cmd; cmd = cmd->next) {
1414 if (!cmd->error_string)
1415 packet_buf_write(&buf, "ok %s\n",
1416 cmd->ref_name);
1417 else
1418 packet_buf_write(&buf, "ng %s %s\n",
1419 cmd->ref_name, cmd->error_string);
1420 }
1421 packet_buf_flush(&buf);
1422 if (use_sideband)
1424 send_sideband(1, 1, buf.buf, buf.len, use_sideband);
1425 else
1426 write_or_die(1, buf.buf, buf.len);
1427 strbuf_release(&buf);
1428}
1429static int delete_only(struct command *commands)
1431{
1432 struct command *cmd;
1433 for (cmd = commands; cmd; cmd = cmd->next) {
1434 if (!is_null_sha1(cmd->new_sha1))
1435 return 0;
1436 }
1437 return 1;
1438}
1439int cmd_receive_pack(int argc, const char **argv, const char *prefix)
1441{
1442 int advertise_refs = 0;
1443 int i;
1444 struct command *commands;
1445 struct sha1_array shallow = SHA1_ARRAY_INIT;
1446 struct sha1_array ref = SHA1_ARRAY_INIT;
1447 struct shallow_info si;
1448 packet_trace_identity("receive-pack");
1450 argv++;
1452 for (i = 1; i < argc; i++) {
1453 const char *arg = *argv++;
1454 if (*arg == '-') {
1456 if (!strcmp(arg, "--quiet")) {
1457 quiet = 1;
1458 continue;
1459 }
1460 if (!strcmp(arg, "--advertise-refs")) {
1462 advertise_refs = 1;
1463 continue;
1464 }
1465 if (!strcmp(arg, "--stateless-rpc")) {
1466 stateless_rpc = 1;
1467 continue;
1468 }
1469 if (!strcmp(arg, "--reject-thin-pack-for-testing")) {
1470 fix_thin = 0;
1471 continue;
1472 }
1473 usage(receive_pack_usage);
1475 }
1476 if (service_dir)
1477 usage(receive_pack_usage);
1478 service_dir = arg;
1479 }
1480 if (!service_dir)
1481 usage(receive_pack_usage);
1482 setup_path();
1484 if (!enter_repo(service_dir, 0))
1486 die("'%s' does not appear to be a git repository", service_dir);
1487 git_config(receive_pack_config, NULL);
1489 if (cert_nonce_seed)
1490 push_cert_nonce = prepare_push_cert_nonce(service_dir, time(NULL));
1491 if (0 <= transfer_unpack_limit)
1493 unpack_limit = transfer_unpack_limit;
1494 else if (0 <= receive_unpack_limit)
1495 unpack_limit = receive_unpack_limit;
1496 if (advertise_refs || !stateless_rpc) {
1498 write_head_info();
1499 }
1500 if (advertise_refs)
1501 return 0;
1502 if ((commands = read_head_info(&shallow)) != NULL) {
1504 const char *unpack_status = NULL;
1505 prepare_shallow_info(&si, &shallow);
1507 if (!si.nr_ours && !si.nr_theirs)
1508 shallow_update = 0;
1509 if (!delete_only(commands)) {
1510 unpack_status = unpack_with_sideband(&si);
1511 update_shallow_info(commands, &si, &ref);
1512 }
1513 execute_commands(commands, unpack_status, &si);
1514 if (pack_lockfile)
1515 unlink_or_warn(pack_lockfile);
1516 if (report_status)
1517 report(commands, unpack_status);
1518 run_receive_hook(commands, "post-receive", 1);
1519 run_update_post_hook(commands);
1520 if (auto_gc) {
1521 const char *argv_gc_auto[] = {
1522 "gc", "--auto", "--quiet", NULL,
1523 };
1524 int opt = RUN_GIT_CMD | RUN_COMMAND_STDOUT_TO_STDERR;
1525 run_command_v_opt(argv_gc_auto, opt);
1526 }
1527 if (auto_update_server_info)
1528 update_server_info(0);
1529 clear_shallow_info(&si);
1530 }
1531 if (use_sideband)
1532 packet_flush(1);
1533 sha1_array_clear(&shallow);
1534 sha1_array_clear(&ref);
1535 free((void *)push_cert_nonce);
1536 return 0;
1537}