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, "push",
846 &err) ||
847 ref_transaction_commit(transaction, &err)) {
848 ref_transaction_free(transaction);
849 rp_error("%s", err.buf);
851 strbuf_release(&err);
852 return "failed to update ref";
853 }
854 ref_transaction_free(transaction);
856 strbuf_release(&err);
857 return NULL; /* good */
858 }
859}
860static void run_update_post_hook(struct command *commands)
862{
863 struct command *cmd;
864 int argc;
865 const char **argv;
866 struct child_process proc = CHILD_PROCESS_INIT;
867 char *hook;
868 hook = find_hook("post-update");
870 for (argc = 0, cmd = commands; cmd; cmd = cmd->next) {
871 if (cmd->error_string || cmd->did_not_exist)
872 continue;
873 argc++;
874 }
875 if (!argc || !hook)
876 return;
877 argv = xmalloc(sizeof(*argv) * (2 + argc));
879 argv[0] = hook;
880 for (argc = 1, cmd = commands; cmd; cmd = cmd->next) {
882 if (cmd->error_string || cmd->did_not_exist)
883 continue;
884 argv[argc] = xstrdup(cmd->ref_name);
885 argc++;
886 }
887 argv[argc] = NULL;
888 proc.no_stdin = 1;
890 proc.stdout_to_stderr = 1;
891 proc.err = use_sideband ? -1 : 0;
892 proc.argv = argv;
893 if (!start_command(&proc)) {
895 if (use_sideband)
896 copy_to_sideband(proc.err, -1, NULL);
897 finish_command(&proc);
898 }
899}
900static void check_aliased_update(struct command *cmd, struct string_list *list)
902{
903 struct strbuf buf = STRBUF_INIT;
904 const char *dst_name;
905 struct string_list_item *item;
906 struct command *dst_cmd;
907 unsigned char sha1[20];
908 char cmd_oldh[41], cmd_newh[41], dst_oldh[41], dst_newh[41];
909 int flag;
910 strbuf_addf(&buf, "%s%s", get_git_namespace(), cmd->ref_name);
912 dst_name = resolve_ref_unsafe(buf.buf, 0, sha1, &flag);
913 strbuf_release(&buf);
914 if (!(flag & REF_ISSYMREF))
916 return;
917 dst_name = strip_namespace(dst_name);
919 if (!dst_name) {
920 rp_error("refusing update to broken symref '%s'", cmd->ref_name);
921 cmd->skip_update = 1;
922 cmd->error_string = "broken symref";
923 return;
924 }
925 if ((item = string_list_lookup(list, dst_name)) == NULL)
927 return;
928 cmd->skip_update = 1;
930 dst_cmd = (struct command *) item->util;
932 if (!hashcmp(cmd->old_sha1, dst_cmd->old_sha1) &&
934 !hashcmp(cmd->new_sha1, dst_cmd->new_sha1))
935 return;
936 dst_cmd->skip_update = 1;
938 strcpy(cmd_oldh, find_unique_abbrev(cmd->old_sha1, DEFAULT_ABBREV));
940 strcpy(cmd_newh, find_unique_abbrev(cmd->new_sha1, DEFAULT_ABBREV));
941 strcpy(dst_oldh, find_unique_abbrev(dst_cmd->old_sha1, DEFAULT_ABBREV));
942 strcpy(dst_newh, find_unique_abbrev(dst_cmd->new_sha1, DEFAULT_ABBREV));
943 rp_error("refusing inconsistent update between symref '%s' (%s..%s) and"
944 " its target '%s' (%s..%s)",
945 cmd->ref_name, cmd_oldh, cmd_newh,
946 dst_cmd->ref_name, dst_oldh, dst_newh);
947 cmd->error_string = dst_cmd->error_string =
949 "inconsistent aliased update";
950}
951static void check_aliased_updates(struct command *commands)
953{
954 struct command *cmd;
955 struct string_list ref_list = STRING_LIST_INIT_NODUP;
956 for (cmd = commands; cmd; cmd = cmd->next) {
958 struct string_list_item *item =
959 string_list_append(&ref_list, cmd->ref_name);
960 item->util = (void *)cmd;
961 }
962 sort_string_list(&ref_list);
963 for (cmd = commands; cmd; cmd = cmd->next) {
965 if (!cmd->error_string)
966 check_aliased_update(cmd, &ref_list);
967 }
968 string_list_clear(&ref_list, 0);
970}
971static int command_singleton_iterator(void *cb_data, unsigned char sha1[20])
973{
974 struct command **cmd_list = cb_data;
975 struct command *cmd = *cmd_list;
976 if (!cmd || is_null_sha1(cmd->new_sha1))
978 return -1; /* end of list */
979 *cmd_list = NULL; /* this returns only one */
980 hashcpy(sha1, cmd->new_sha1);
981 return 0;
982}
983static void set_connectivity_errors(struct command *commands,
985 struct shallow_info *si)
986{
987 struct command *cmd;
988 for (cmd = commands; cmd; cmd = cmd->next) {
990 struct command *singleton = cmd;
991 if (shallow_update && si->shallow_ref[cmd->index])
992 /* to be checked in update_shallow_ref() */
993 continue;
994 if (!check_everything_connected(command_singleton_iterator,
995 0, &singleton))
996 continue;
997 cmd->error_string = "missing necessary objects";
998 }
999}
1000struct iterate_data {
1002 struct command *cmds;
1003 struct shallow_info *si;
1004};
1005static int iterate_receive_command_list(void *cb_data, unsigned char sha1[20])
1007{
1008 struct iterate_data *data = cb_data;
1009 struct command **cmd_list = &data->cmds;
1010 struct command *cmd = *cmd_list;
1011 for (; cmd; cmd = cmd->next) {
1013 if (shallow_update && data->si->shallow_ref[cmd->index])
1014 /* to be checked in update_shallow_ref() */
1015 continue;
1016 if (!is_null_sha1(cmd->new_sha1) && !cmd->skip_update) {
1017 hashcpy(sha1, cmd->new_sha1);
1018 *cmd_list = cmd->next;
1019 return 0;
1020 }
1021 }
1022 *cmd_list = NULL;
1023 return -1; /* end of list */
1024}
1025static void reject_updates_to_hidden(struct command *commands)
1027{
1028 struct command *cmd;
1029 for (cmd = commands; cmd; cmd = cmd->next) {
1031 if (cmd->error_string || !ref_is_hidden(cmd->ref_name))
1032 continue;
1033 if (is_null_sha1(cmd->new_sha1))
1034 cmd->error_string = "deny deleting a hidden ref";
1035 else
1036 cmd->error_string = "deny updating a hidden ref";
1037 }
1038}
1039static void execute_commands(struct command *commands,
1041 const char *unpacker_error,
1042 struct shallow_info *si)
1043{
1044 int checked_connectivity;
1045 struct command *cmd;
1046 unsigned char sha1[20];
1047 struct iterate_data data;
1048 if (unpacker_error) {
1050 for (cmd = commands; cmd; cmd = cmd->next)
1051 cmd->error_string = "unpacker error";
1052 return;
1053 }
1054 data.cmds = commands;
1056 data.si = si;
1057 if (check_everything_connected(iterate_receive_command_list, 0, &data))
1058 set_connectivity_errors(commands, si);
1059 reject_updates_to_hidden(commands);
1061 if (run_receive_hook(commands, "pre-receive", 0)) {
1063 for (cmd = commands; cmd; cmd = cmd->next) {
1064 if (!cmd->error_string)
1065 cmd->error_string = "pre-receive hook declined";
1066 }
1067 return;
1068 }
1069 check_aliased_updates(commands);
1071 free(head_name_to_free);
1073 head_name = head_name_to_free = resolve_refdup("HEAD", 0, sha1, NULL);
1074 checked_connectivity = 1;
1076 for (cmd = commands; cmd; cmd = cmd->next) {
1077 if (cmd->error_string)
1078 continue;
1079 if (cmd->skip_update)
1081 continue;
1082 cmd->error_string = update(cmd, si);
1084 if (shallow_update && !cmd->error_string &&
1085 si->shallow_ref[cmd->index]) {
1086 error("BUG: connectivity check has not been run on ref %s",
1087 cmd->ref_name);
1088 checked_connectivity = 0;
1089 }
1090 }
1091 if (shallow_update && !checked_connectivity)
1093 error("BUG: run 'git fsck' for safety.\n"
1094 "If there are errors, try to remove "
1095 "the reported refs above");
1096}
1097static struct command **queue_command(struct command **tail,
1099 const char *line,
1100 int linelen)
1101{
1102 unsigned char old_sha1[20], new_sha1[20];
1103 struct command *cmd;
1104 const char *refname;
1105 int reflen;
1106 if (linelen < 83 ||
1108 line[40] != ' ' ||
1109 line[81] != ' ' ||
1110 get_sha1_hex(line, old_sha1) ||
1111 get_sha1_hex(line + 41, new_sha1))
1112 die("protocol error: expected old/new/ref, got '%s'", line);
1113 refname = line + 82;
1115 reflen = linelen - 82;
1116 cmd = xcalloc(1, sizeof(struct command) + reflen + 1);
1117 hashcpy(cmd->old_sha1, old_sha1);
1118 hashcpy(cmd->new_sha1, new_sha1);
1119 memcpy(cmd->ref_name, refname, reflen);
1120 cmd->ref_name[reflen] = '\0';
1121 *tail = cmd;
1122 return &cmd->next;
1123}
1124static void queue_commands_from_cert(struct command **tail,
1126 struct strbuf *push_cert)
1127{
1128 const char *boc, *eoc;
1129 if (*tail)
1131 die("protocol error: got both push certificate and unsigned commands");
1132 boc = strstr(push_cert->buf, "\n\n");
1134 if (!boc)
1135 die("malformed push certificate %.*s", 100, push_cert->buf);
1136 else
1137 boc += 2;
1138 eoc = push_cert->buf + parse_signature(push_cert->buf, push_cert->len);
1139 while (boc < eoc) {
1141 const char *eol = memchr(boc, '\n', eoc - boc);
1142 tail = queue_command(tail, boc, eol ? eol - boc : eoc - eol);
1143 boc = eol ? eol + 1 : eoc;
1144 }
1145}
1146static struct command *read_head_info(struct sha1_array *shallow)
1148{
1149 struct command *commands = NULL;
1150 struct command **p = &commands;
1151 for (;;) {
1152 char *line;
1153 int len, linelen;
1154 line = packet_read_line(0, &len);
1156 if (!line)
1157 break;
1158 if (len == 48 && starts_with(line, "shallow ")) {
1160 unsigned char sha1[20];
1161 if (get_sha1_hex(line + 8, sha1))
1162 die("protocol error: expected shallow sha, got '%s'",
1163 line + 8);
1164 sha1_array_append(shallow, sha1);
1165 continue;
1166 }
1167 linelen = strlen(line);
1169 if (linelen < len) {
1170 const char *feature_list = line + linelen + 1;
1171 if (parse_feature_request(feature_list, "report-status"))
1172 report_status = 1;
1173 if (parse_feature_request(feature_list, "side-band-64k"))
1174 use_sideband = LARGE_PACKET_MAX;
1175 if (parse_feature_request(feature_list, "quiet"))
1176 quiet = 1;
1177 }
1178 if (!strcmp(line, "push-cert")) {
1180 int true_flush = 0;
1181 char certbuf[1024];
1182 for (;;) {
1184 len = packet_read(0, NULL, NULL,
1185 certbuf, sizeof(certbuf), 0);
1186 if (!len) {
1187 true_flush = 1;
1188 break;
1189 }
1190 if (!strcmp(certbuf, "push-cert-end\n"))
1191 break; /* end of cert */
1192 strbuf_addstr(&push_cert, certbuf);
1193 }
1194 if (true_flush)
1196 break;
1197 continue;
1198 }
1199 p = queue_command(p, line, linelen);
1201 }
1202 if (push_cert.len)
1204 queue_commands_from_cert(p, &push_cert);
1205 return commands;
1207}
1208static const char *parse_pack_header(struct pack_header *hdr)
1210{
1211 switch (read_pack_header(0, hdr)) {
1212 case PH_ERROR_EOF:
1213 return "eof before pack header was fully read";
1214 case PH_ERROR_PACK_SIGNATURE:
1216 return "protocol error (pack signature mismatch detected)";
1217 case PH_ERROR_PROTOCOL:
1219 return "protocol error (pack version unsupported)";
1220 default:
1222 return "unknown error in parse_pack_header";
1223 case 0:
1225 return NULL;
1226 }
1227}
1228static const char *pack_lockfile;
1230static const char *unpack(int err_fd, struct shallow_info *si)
1232{
1233 struct pack_header hdr;
1234 const char *hdr_err;
1235 int status;
1236 char hdr_arg[38];
1237 struct child_process child = CHILD_PROCESS_INIT;
1238 int fsck_objects = (receive_fsck_objects >= 0
1239 ? receive_fsck_objects
1240 : transfer_fsck_objects >= 0
1241 ? transfer_fsck_objects
1242 : 0);
1243 hdr_err = parse_pack_header(&hdr);
1245 if (hdr_err) {
1246 if (err_fd > 0)
1247 close(err_fd);
1248 return hdr_err;
1249 }
1250 snprintf(hdr_arg, sizeof(hdr_arg),
1251 "--pack_header=%"PRIu32",%"PRIu32,
1252 ntohl(hdr.hdr_version), ntohl(hdr.hdr_entries));
1253 if (si->nr_ours || si->nr_theirs) {
1255 alt_shallow_file = setup_temporary_shallow(si->shallow);
1256 argv_array_push(&child.args, "--shallow-file");
1257 argv_array_push(&child.args, alt_shallow_file);
1258 }
1259 if (ntohl(hdr.hdr_entries) < unpack_limit) {
1261 argv_array_pushl(&child.args, "unpack-objects", hdr_arg, NULL);
1262 if (quiet)
1263 argv_array_push(&child.args, "-q");
1264 if (fsck_objects)
1265 argv_array_push(&child.args, "--strict");
1266 child.no_stdout = 1;
1267 child.err = err_fd;
1268 child.git_cmd = 1;
1269 status = run_command(&child);
1270 if (status)
1271 return "unpack-objects abnormal exit";
1272 } else {
1273 int s;
1274 char keep_arg[256];
1275 s = sprintf(keep_arg, "--keep=receive-pack %"PRIuMAX" on ", (uintmax_t) getpid());
1277 if (gethostname(keep_arg + s, sizeof(keep_arg) - s))
1278 strcpy(keep_arg + s, "localhost");
1279 argv_array_pushl(&child.args, "index-pack",
1281 "--stdin", hdr_arg, keep_arg, NULL);
1282 if (fsck_objects)
1283 argv_array_push(&child.args, "--strict");
1284 if (fix_thin)
1285 argv_array_push(&child.args, "--fix-thin");
1286 child.out = -1;
1287 child.err = err_fd;
1288 child.git_cmd = 1;
1289 status = start_command(&child);
1290 if (status)
1291 return "index-pack fork failed";
1292 pack_lockfile = index_pack_lockfile(child.out);
1293 close(child.out);
1294 status = finish_command(&child);
1295 if (status)
1296 return "index-pack abnormal exit";
1297 reprepare_packed_git();
1298 }
1299 return NULL;
1300}
1301static const char *unpack_with_sideband(struct shallow_info *si)
1303{
1304 struct async muxer;
1305 const char *ret;
1306 if (!use_sideband)
1308 return unpack(0, si);
1309 memset(&muxer, 0, sizeof(muxer));
1311 muxer.proc = copy_to_sideband;
1312 muxer.in = -1;
1313 if (start_async(&muxer))
1314 return NULL;
1315 ret = unpack(muxer.in, si);
1317 finish_async(&muxer);
1319 return ret;
1320}
1321static void prepare_shallow_update(struct command *commands,
1323 struct shallow_info *si)
1324{
1325 int i, j, k, bitmap_size = (si->ref->nr + 31) / 32;
1326 si->used_shallow = xmalloc(sizeof(*si->used_shallow) *
1328 si->shallow->nr);
1329 assign_shallow_commits_to_refs(si, si->used_shallow, NULL);
1330 si->need_reachability_test =
1332 xcalloc(si->shallow->nr, sizeof(*si->need_reachability_test));
1333 si->reachable =
1334 xcalloc(si->shallow->nr, sizeof(*si->reachable));
1335 si->shallow_ref = xcalloc(si->ref->nr, sizeof(*si->shallow_ref));
1336 for (i = 0; i < si->nr_ours; i++)
1338 si->need_reachability_test[si->ours[i]] = 1;
1339 for (i = 0; i < si->shallow->nr; i++) {
1341 if (!si->used_shallow[i])
1342 continue;
1343 for (j = 0; j < bitmap_size; j++) {
1344 if (!si->used_shallow[i][j])
1345 continue;
1346 si->need_reachability_test[i]++;
1347 for (k = 0; k < 32; k++)
1348 if (si->used_shallow[i][j] & (1 << k))
1349 si->shallow_ref[j * 32 + k]++;
1350 }
1351 /*
1353 * true for those associated with some refs and belong
1354 * in "ours" list aka "step 7 not done yet"
1355 */
1356 si->need_reachability_test[i] =
1357 si->need_reachability_test[i] > 1;
1358 }
1359 /*
1361 * keep hooks happy by forcing a temporary shallow file via
1362 * env variable because we can't add --shallow-file to every
1363 * command. check_everything_connected() will be done with
1364 * true .git/shallow though.
1365 */
1366 setenv(GIT_SHALLOW_FILE_ENVIRONMENT, alt_shallow_file, 1);
1367}
1368static void update_shallow_info(struct command *commands,
1370 struct shallow_info *si,
1371 struct sha1_array *ref)
1372{
1373 struct command *cmd;
1374 int *ref_status;
1375 remove_nonexistent_theirs_shallow(si);
1376 if (!si->nr_ours && !si->nr_theirs) {
1377 shallow_update = 0;
1378 return;
1379 }
1380 for (cmd = commands; cmd; cmd = cmd->next) {
1382 if (is_null_sha1(cmd->new_sha1))
1383 continue;
1384 sha1_array_append(ref, cmd->new_sha1);
1385 cmd->index = ref->nr - 1;
1386 }
1387 si->ref = ref;
1388 if (shallow_update) {
1390 prepare_shallow_update(commands, si);
1391 return;
1392 }
1393 ref_status = xmalloc(sizeof(*ref_status) * ref->nr);
1395 assign_shallow_commits_to_refs(si, NULL, ref_status);
1396 for (cmd = commands; cmd; cmd = cmd->next) {
1397 if (is_null_sha1(cmd->new_sha1))
1398 continue;
1399 if (ref_status[cmd->index]) {
1400 cmd->error_string = "shallow update not allowed";
1401 cmd->skip_update = 1;
1402 }
1403 }
1404 free(ref_status);
1405}
1406static void report(struct command *commands, const char *unpack_status)
1408{
1409 struct command *cmd;
1410 struct strbuf buf = STRBUF_INIT;
1411 packet_buf_write(&buf, "unpack %s\n",
1413 unpack_status ? unpack_status : "ok");
1414 for (cmd = commands; cmd; cmd = cmd->next) {
1415 if (!cmd->error_string)
1416 packet_buf_write(&buf, "ok %s\n",
1417 cmd->ref_name);
1418 else
1419 packet_buf_write(&buf, "ng %s %s\n",
1420 cmd->ref_name, cmd->error_string);
1421 }
1422 packet_buf_flush(&buf);
1423 if (use_sideband)
1425 send_sideband(1, 1, buf.buf, buf.len, use_sideband);
1426 else
1427 write_or_die(1, buf.buf, buf.len);
1428 strbuf_release(&buf);
1429}
1430static int delete_only(struct command *commands)
1432{
1433 struct command *cmd;
1434 for (cmd = commands; cmd; cmd = cmd->next) {
1435 if (!is_null_sha1(cmd->new_sha1))
1436 return 0;
1437 }
1438 return 1;
1439}
1440int cmd_receive_pack(int argc, const char **argv, const char *prefix)
1442{
1443 int advertise_refs = 0;
1444 int i;
1445 struct command *commands;
1446 struct sha1_array shallow = SHA1_ARRAY_INIT;
1447 struct sha1_array ref = SHA1_ARRAY_INIT;
1448 struct shallow_info si;
1449 packet_trace_identity("receive-pack");
1451 argv++;
1453 for (i = 1; i < argc; i++) {
1454 const char *arg = *argv++;
1455 if (*arg == '-') {
1457 if (!strcmp(arg, "--quiet")) {
1458 quiet = 1;
1459 continue;
1460 }
1461 if (!strcmp(arg, "--advertise-refs")) {
1463 advertise_refs = 1;
1464 continue;
1465 }
1466 if (!strcmp(arg, "--stateless-rpc")) {
1467 stateless_rpc = 1;
1468 continue;
1469 }
1470 if (!strcmp(arg, "--reject-thin-pack-for-testing")) {
1471 fix_thin = 0;
1472 continue;
1473 }
1474 usage(receive_pack_usage);
1476 }
1477 if (service_dir)
1478 usage(receive_pack_usage);
1479 service_dir = arg;
1480 }
1481 if (!service_dir)
1482 usage(receive_pack_usage);
1483 setup_path();
1485 if (!enter_repo(service_dir, 0))
1487 die("'%s' does not appear to be a git repository", service_dir);
1488 git_config(receive_pack_config, NULL);
1490 if (cert_nonce_seed)
1491 push_cert_nonce = prepare_push_cert_nonce(service_dir, time(NULL));
1492 if (0 <= transfer_unpack_limit)
1494 unpack_limit = transfer_unpack_limit;
1495 else if (0 <= receive_unpack_limit)
1496 unpack_limit = receive_unpack_limit;
1497 if (advertise_refs || !stateless_rpc) {
1499 write_head_info();
1500 }
1501 if (advertise_refs)
1502 return 0;
1503 if ((commands = read_head_info(&shallow)) != NULL) {
1505 const char *unpack_status = NULL;
1506 prepare_shallow_info(&si, &shallow);
1508 if (!si.nr_ours && !si.nr_theirs)
1509 shallow_update = 0;
1510 if (!delete_only(commands)) {
1511 unpack_status = unpack_with_sideband(&si);
1512 update_shallow_info(commands, &si, &ref);
1513 }
1514 execute_commands(commands, unpack_status, &si);
1515 if (pack_lockfile)
1516 unlink_or_warn(pack_lockfile);
1517 if (report_status)
1518 report(commands, unpack_status);
1519 run_receive_hook(commands, "post-receive", 1);
1520 run_update_post_hook(commands);
1521 if (auto_gc) {
1522 const char *argv_gc_auto[] = {
1523 "gc", "--auto", "--quiet", NULL,
1524 };
1525 int opt = RUN_GIT_CMD | RUN_COMMAND_STDOUT_TO_STDERR;
1526 run_command_v_opt(argv_gc_auto, opt);
1527 }
1528 if (auto_update_server_info)
1529 update_server_info(0);
1530 clear_shallow_info(&si);
1531 }
1532 if (use_sideband)
1533 packet_flush(1);
1534 sha1_array_clear(&shallow);
1535 sha1_array_clear(&ref);
1536 free((void *)push_cert_nonce);
1537 return 0;
1538}