1#include "builtin.h"
2#include "repository.h"
3#include "config.h"
4#include "lockfile.h"
5#include "pack.h"
6#include "refs.h"
7#include "pkt-line.h"
8#include "sideband.h"
9#include "run-command.h"
10#include "exec-cmd.h"
11#include "commit.h"
12#include "object.h"
13#include "remote.h"
14#include "connect.h"
15#include "transport.h"
16#include "string-list.h"
17#include "sha1-array.h"
18#include "connected.h"
19#include "argv-array.h"
20#include "version.h"
21#include "tag.h"
22#include "gpg-interface.h"
23#include "sigchain.h"
24#include "fsck.h"
25#include "tmp-objdir.h"
26#include "oidset.h"
27#include "packfile.h"
28#include "object-store.h"
29#include "protocol.h"
30#include "commit-reach.h"
31static const char * const receive_pack_usage[] = {
33 N_("git receive-pack <git-dir>"),
34 NULL
35};
36enum deny_action {
38 DENY_UNCONFIGURED,
39 DENY_IGNORE,
40 DENY_WARN,
41 DENY_REFUSE,
42 DENY_UPDATE_INSTEAD
43};
44static int deny_deletes;
46static int deny_non_fast_forwards;
47static enum deny_action deny_current_branch = DENY_UNCONFIGURED;
48static enum deny_action deny_delete_current = DENY_UNCONFIGURED;
49static int receive_fsck_objects = -1;
50static int transfer_fsck_objects = -1;
51static struct strbuf fsck_msg_types = STRBUF_INIT;
52static int receive_unpack_limit = -1;
53static int transfer_unpack_limit = -1;
54static int advertise_atomic_push = 1;
55static int advertise_push_options;
56static int unpack_limit = 100;
57static off_t max_input_size;
58static int report_status;
59static int use_sideband;
60static int use_atomic;
61static int use_push_options;
62static int quiet;
63static int prefer_ofs_delta = 1;
64static int auto_update_server_info;
65static int auto_gc = 1;
66static int reject_thin;
67static int stateless_rpc;
68static const char *service_dir;
69static const char *head_name;
70static void *head_name_to_free;
71static int sent_capabilities;
72static int shallow_update;
73static const char *alt_shallow_file;
74static struct strbuf push_cert = STRBUF_INIT;
75static struct object_id push_cert_oid;
76static struct signature_check sigcheck;
77static const char *push_cert_nonce;
78static const char *cert_nonce_seed;
79static const char *NONCE_UNSOLICITED = "UNSOLICITED";
81static const char *NONCE_BAD = "BAD";
82static const char *NONCE_MISSING = "MISSING";
83static const char *NONCE_OK = "OK";
84static const char *NONCE_SLOP = "SLOP";
85static const char *nonce_status;
86static long nonce_stamp_slop;
87static timestamp_t nonce_stamp_slop_limit;
88static struct ref_transaction *transaction;
89static enum {
91 KEEPALIVE_NEVER = 0,
92 KEEPALIVE_AFTER_NUL,
93 KEEPALIVE_ALWAYS
94} use_keepalive;
95static int keepalive_in_sec = 5;
96static struct tmp_objdir *tmp_objdir;
98static enum deny_action parse_deny_action(const char *var, const char *value)
100{
101 if (value) {
102 if (!strcasecmp(value, "ignore"))
103 return DENY_IGNORE;
104 if (!strcasecmp(value, "warn"))
105 return DENY_WARN;
106 if (!strcasecmp(value, "refuse"))
107 return DENY_REFUSE;
108 if (!strcasecmp(value, "updateinstead"))
109 return DENY_UPDATE_INSTEAD;
110 }
111 if (git_config_bool(var, value))
112 return DENY_REFUSE;
113 return DENY_IGNORE;
114}
115static int receive_pack_config(const char *var, const char *value, void *cb)
117{
118 int status = parse_hide_refs_config(var, value, "receive");
119 if (status)
121 return status;
122 if (strcmp(var, "receive.denydeletes") == 0) {
124 deny_deletes = git_config_bool(var, value);
125 return 0;
126 }
127 if (strcmp(var, "receive.denynonfastforwards") == 0) {
129 deny_non_fast_forwards = git_config_bool(var, value);
130 return 0;
131 }
132 if (strcmp(var, "receive.unpacklimit") == 0) {
134 receive_unpack_limit = git_config_int(var, value);
135 return 0;
136 }
137 if (strcmp(var, "transfer.unpacklimit") == 0) {
139 transfer_unpack_limit = git_config_int(var, value);
140 return 0;
141 }
142 if (strcmp(var, "receive.fsck.skiplist") == 0) {
144 const char *path;
145 if (git_config_pathname(&path, var, value))
147 return 1;
148 strbuf_addf(&fsck_msg_types, "%cskiplist=%s",
149 fsck_msg_types.len ? ',' : '=', path);
150 free((char *)path);
151 return 0;
152 }
153 if (skip_prefix(var, "receive.fsck.", &var)) {
155 if (is_valid_msg_type(var, value))
156 strbuf_addf(&fsck_msg_types, "%c%s=%s",
157 fsck_msg_types.len ? ',' : '=', var, value);
158 else
159 warning("Skipping unknown msg id '%s'", var);
160 return 0;
161 }
162 if (strcmp(var, "receive.fsckobjects") == 0) {
164 receive_fsck_objects = git_config_bool(var, value);
165 return 0;
166 }
167 if (strcmp(var, "transfer.fsckobjects") == 0) {
169 transfer_fsck_objects = git_config_bool(var, value);
170 return 0;
171 }
172 if (!strcmp(var, "receive.denycurrentbranch")) {
174 deny_current_branch = parse_deny_action(var, value);
175 return 0;
176 }
177 if (strcmp(var, "receive.denydeletecurrent") == 0) {
179 deny_delete_current = parse_deny_action(var, value);
180 return 0;
181 }
182 if (strcmp(var, "repack.usedeltabaseoffset") == 0) {
184 prefer_ofs_delta = git_config_bool(var, value);
185 return 0;
186 }
187 if (strcmp(var, "receive.updateserverinfo") == 0) {
189 auto_update_server_info = git_config_bool(var, value);
190 return 0;
191 }
192 if (strcmp(var, "receive.autogc") == 0) {
194 auto_gc = git_config_bool(var, value);
195 return 0;
196 }
197 if (strcmp(var, "receive.shallowupdate") == 0) {
199 shallow_update = git_config_bool(var, value);
200 return 0;
201 }
202 if (strcmp(var, "receive.certnonceseed") == 0)
204 return git_config_string(&cert_nonce_seed, var, value);
205 if (strcmp(var, "receive.certnonceslop") == 0) {
207 nonce_stamp_slop_limit = git_config_ulong(var, value);
208 return 0;
209 }
210 if (strcmp(var, "receive.advertiseatomic") == 0) {
212 advertise_atomic_push = git_config_bool(var, value);
213 return 0;
214 }
215 if (strcmp(var, "receive.advertisepushoptions") == 0) {
217 advertise_push_options = git_config_bool(var, value);
218 return 0;
219 }
220 if (strcmp(var, "receive.keepalive") == 0) {
222 keepalive_in_sec = git_config_int(var, value);
223 return 0;
224 }
225 if (strcmp(var, "receive.maxinputsize") == 0) {
227 max_input_size = git_config_int64(var, value);
228 return 0;
229 }
230 return git_default_config(var, value, cb);
232}
233static void show_ref(const char *path, const struct object_id *oid)
235{
236 if (sent_capabilities) {
237 packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), path);
238 } else {
239 struct strbuf cap = STRBUF_INIT;
240 strbuf_addstr(&cap,
242 "report-status delete-refs side-band-64k quiet");
243 if (advertise_atomic_push)
244 strbuf_addstr(&cap, " atomic");
245 if (prefer_ofs_delta)
246 strbuf_addstr(&cap, " ofs-delta");
247 if (push_cert_nonce)
248 strbuf_addf(&cap, " push-cert=%s", push_cert_nonce);
249 if (advertise_push_options)
250 strbuf_addstr(&cap, " push-options");
251 strbuf_addf(&cap, " agent=%s", git_user_agent_sanitized());
252 packet_write_fmt(1, "%s %s%c%s\n",
253 oid_to_hex(oid), path, 0, cap.buf);
254 strbuf_release(&cap);
255 sent_capabilities = 1;
256 }
257}
258static int show_ref_cb(const char *path_full, const struct object_id *oid,
260 int flag, void *data)
261{
262 struct oidset *seen = data;
263 const char *path = strip_namespace(path_full);
264 if (ref_is_hidden(path, path_full))
266 return 0;
267 /*
269 * Advertise refs outside our current namespace as ".have"
270 * refs, so that the client can use them to minimize data
271 * transfer but will otherwise ignore them.
272 */
273 if (!path) {
274 if (oidset_insert(seen, oid))
275 return 0;
276 path = ".have";
277 } else {
278 oidset_insert(seen, oid);
279 }
280 show_ref(path, oid);
281 return 0;
282}
283static void show_one_alternate_ref(const struct object_id *oid,
285 void *data)
286{
287 struct oidset *seen = data;
288 if (oidset_insert(seen, oid))
290 return;
291 show_ref(".have", oid);
293}
294static void write_head_info(void)
296{
297 static struct oidset seen = OIDSET_INIT;
298 for_each_ref(show_ref_cb, &seen);
300 for_each_alternate_ref(show_one_alternate_ref, &seen);
301 oidset_clear(&seen);
302 if (!sent_capabilities)
303 show_ref("capabilities^{}", &null_oid);
304 advertise_shallow_grafts(1);
306 /* EOF */
308 packet_flush(1);
309}
310struct command {
312 struct command *next;
313 const char *error_string;
314 unsigned int skip_update:1,
315 did_not_exist:1;
316 int index;
317 struct object_id old_oid;
318 struct object_id new_oid;
319 char ref_name[FLEX_ARRAY]; /* more */
320};
321static void rp_error(const char *err, ...) __attribute__((format (printf, 1, 2)));
323static void rp_warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
324static void report_message(const char *prefix, const char *err, va_list params)
326{
327 int sz;
328 char msg[4096];
329 sz = xsnprintf(msg, sizeof(msg), "%s", prefix);
331 sz += vsnprintf(msg + sz, sizeof(msg) - sz, err, params);
332 if (sz > (sizeof(msg) - 1))
333 sz = sizeof(msg) - 1;
334 msg[sz++] = '\n';
335 if (use_sideband)
337 send_sideband(1, 2, msg, sz, use_sideband);
338 else
339 xwrite(2, msg, sz);
340}
341static void rp_warning(const char *err, ...)
343{
344 va_list params;
345 va_start(params, err);
346 report_message("warning: ", err, params);
347 va_end(params);
348}
349static void rp_error(const char *err, ...)
351{
352 va_list params;
353 va_start(params, err);
354 report_message("error: ", err, params);
355 va_end(params);
356}
357static int copy_to_sideband(int in, int out, void *arg)
359{
360 char data[128];
361 int keepalive_active = 0;
362 if (keepalive_in_sec <= 0)
364 use_keepalive = KEEPALIVE_NEVER;
365 if (use_keepalive == KEEPALIVE_ALWAYS)
366 keepalive_active = 1;
367 while (1) {
369 ssize_t sz;
370 if (keepalive_active) {
372 struct pollfd pfd;
373 int ret;
374 pfd.fd = in;
376 pfd.events = POLLIN;
377 ret = poll(&pfd, 1, 1000 * keepalive_in_sec);
378 if (ret < 0) {
380 if (errno == EINTR)
381 continue;
382 else
383 break;
384 } else if (ret == 0) {
385 /* no data; send a keepalive packet */
386 static const char buf[] = "0005\1";
387 write_or_die(1, buf, sizeof(buf) - 1);
388 continue;
389 } /* else there is actual data to read */
390 }
391 sz = xread(in, data, sizeof(data));
393 if (sz <= 0)
394 break;
395 if (use_keepalive == KEEPALIVE_AFTER_NUL && !keepalive_active) {
397 const char *p = memchr(data, '\0', sz);
398 if (p) {
399 /*
400 * The NUL tells us to start sending keepalives. Make
401 * sure we send any other data we read along
402 * with it.
403 */
404 keepalive_active = 1;
405 send_sideband(1, 2, data, p - data, use_sideband);
406 send_sideband(1, 2, p + 1, sz - (p - data + 1), use_sideband);
407 continue;
408 }
409 }
410 /*
412 * Either we're not looking for a NUL signal, or we didn't see
413 * it yet; just pass along the data.
414 */
415 send_sideband(1, 2, data, sz, use_sideband);
416 }
417 close(in);
418 return 0;
419}
420#define HMAC_BLOCK_SIZE 64
422static void hmac_sha1(unsigned char *out,
424 const char *key_in, size_t key_len,
425 const char *text, size_t text_len)
426{
427 unsigned char key[HMAC_BLOCK_SIZE];
428 unsigned char k_ipad[HMAC_BLOCK_SIZE];
429 unsigned char k_opad[HMAC_BLOCK_SIZE];
430 int i;
431 git_SHA_CTX ctx;
432 /* RFC 2104 2. (1) */
434 memset(key, '\0', HMAC_BLOCK_SIZE);
435 if (HMAC_BLOCK_SIZE < key_len) {
436 git_SHA1_Init(&ctx);
437 git_SHA1_Update(&ctx, key_in, key_len);
438 git_SHA1_Final(key, &ctx);
439 } else {
440 memcpy(key, key_in, key_len);
441 }
442 /* RFC 2104 2. (2) & (5) */
444 for (i = 0; i < sizeof(key); i++) {
445 k_ipad[i] = key[i] ^ 0x36;
446 k_opad[i] = key[i] ^ 0x5c;
447 }
448 /* RFC 2104 2. (3) & (4) */
450 git_SHA1_Init(&ctx);
451 git_SHA1_Update(&ctx, k_ipad, sizeof(k_ipad));
452 git_SHA1_Update(&ctx, text, text_len);
453 git_SHA1_Final(out, &ctx);
454 /* RFC 2104 2. (6) & (7) */
456 git_SHA1_Init(&ctx);
457 git_SHA1_Update(&ctx, k_opad, sizeof(k_opad));
458 git_SHA1_Update(&ctx, out, GIT_SHA1_RAWSZ);
459 git_SHA1_Final(out, &ctx);
460}
461static char *prepare_push_cert_nonce(const char *path, timestamp_t stamp)
463{
464 struct strbuf buf = STRBUF_INIT;
465 unsigned char sha1[GIT_SHA1_RAWSZ];
466 strbuf_addf(&buf, "%s:%"PRItime, path, stamp);
468 hmac_sha1(sha1, buf.buf, buf.len, cert_nonce_seed, strlen(cert_nonce_seed));
469 strbuf_release(&buf);
470 /* RFC 2104 5. HMAC-SHA1-80 */
472 strbuf_addf(&buf, "%"PRItime"-%.*s", stamp, GIT_SHA1_HEXSZ, sha1_to_hex(sha1));
473 return strbuf_detach(&buf, NULL);
474}
475/*
477 * NEEDSWORK: reuse find_commit_header() from jk/commit-author-parsing
478 * after dropping "_commit" from its name and possibly moving it out
479 * of commit.c
480 */
481static char *find_header(const char *msg, size_t len, const char *key,
482 const char **next_line)
483{
484 int key_len = strlen(key);
485 const char *line = msg;
486 while (line && line < msg + len) {
488 const char *eol = strchrnul(line, '\n');
489 if ((msg + len <= eol) || line == eol)
491 return NULL;
492 if (line + key_len < eol &&
493 !memcmp(line, key, key_len) && line[key_len] == ' ') {
494 int offset = key_len + 1;
495 if (next_line)
496 *next_line = *eol ? eol + 1 : eol;
497 return xmemdupz(line + offset, (eol - line) - offset);
498 }
499 line = *eol ? eol + 1 : NULL;
500 }
501 return NULL;
502}
503static const char *check_nonce(const char *buf, size_t len)
505{
506 char *nonce = find_header(buf, len, "nonce", NULL);
507 timestamp_t stamp, ostamp;
508 char *bohmac, *expect = NULL;
509 const char *retval = NONCE_BAD;
510 if (!nonce) {
512 retval = NONCE_MISSING;
513 goto leave;
514 } else if (!push_cert_nonce) {
515 retval = NONCE_UNSOLICITED;
516 goto leave;
517 } else if (!strcmp(push_cert_nonce, nonce)) {
518 retval = NONCE_OK;
519 goto leave;
520 }
521 if (!stateless_rpc) {
523 /* returned nonce MUST match what we gave out earlier */
524 retval = NONCE_BAD;
525 goto leave;
526 }
527 /*
529 * In stateless mode, we may be receiving a nonce issued by
530 * another instance of the server that serving the same
531 * repository, and the timestamps may not match, but the
532 * nonce-seed and dir should match, so we can recompute and
533 * report the time slop.
534 *
535 * In addition, when a nonce issued by another instance has
536 * timestamp within receive.certnonceslop seconds, we pretend
537 * as if we issued that nonce when reporting to the hook.
538 */
539 /* nonce is concat(<seconds-since-epoch>, "-", <hmac>) */
541 if (*nonce <= '0' || '9' < *nonce) {
542 retval = NONCE_BAD;
543 goto leave;
544 }
545 stamp = parse_timestamp(nonce, &bohmac, 10);
546 if (bohmac == nonce || bohmac[0] != '-') {
547 retval = NONCE_BAD;
548 goto leave;
549 }
550 expect = prepare_push_cert_nonce(service_dir, stamp);
552 if (strcmp(expect, nonce)) {
553 /* Not what we would have signed earlier */
554 retval = NONCE_BAD;
555 goto leave;
556 }
557 /*
559 * By how many seconds is this nonce stale? Negative value
560 * would mean it was issued by another server with its clock
561 * skewed in the future.
562 */
563 ostamp = parse_timestamp(push_cert_nonce, NULL, 10);
564 nonce_stamp_slop = (long)ostamp - (long)stamp;
565 if (nonce_stamp_slop_limit &&
567 labs(nonce_stamp_slop) <= nonce_stamp_slop_limit) {
568 /*
569 * Pretend as if the received nonce (which passes the
570 * HMAC check, so it is not a forged by third-party)
571 * is what we issued.
572 */
573 free((void *)push_cert_nonce);
574 push_cert_nonce = xstrdup(nonce);
575 retval = NONCE_OK;
576 } else {
577 retval = NONCE_SLOP;
578 }
579leave:
581 free(nonce);
582 free(expect);
583 return retval;
584}
585/*
587 * Return 1 if there is no push_cert or if the push options in push_cert are
588 * the same as those in the argument; 0 otherwise.
589 */
590static int check_cert_push_options(const struct string_list *push_options)
591{
592 const char *buf = push_cert.buf;
593 int len = push_cert.len;
594 char *option;
596 const char *next_line;
597 int options_seen = 0;
598 int retval = 1;
600 if (!len)
602 return 1;
603 while ((option = find_header(buf, len, "push-option", &next_line))) {
605 len -= (next_line - buf);
606 buf = next_line;
607 options_seen++;
608 if (options_seen > push_options->nr
609 || strcmp(option,
610 push_options->items[options_seen - 1].string)) {
611 retval = 0;
612 goto leave;
613 }
614 free(option);
615 }
616 if (options_seen != push_options->nr)
618 retval = 0;
619leave:
621 free(option);
622 return retval;
623}
624static void prepare_push_cert_sha1(struct child_process *proc)
626{
627 static int already_done;
628 if (!push_cert.len)
630 return;
631 if (!already_done) {
633 int bogs /* beginning_of_gpg_sig */;
634 already_done = 1;
636 if (write_object_file(push_cert.buf, push_cert.len, "blob",
637 &push_cert_oid))
638 oidclr(&push_cert_oid);
639 memset(&sigcheck, '\0', sizeof(sigcheck));
641 bogs = parse_signature(push_cert.buf, push_cert.len);
643 check_signature(push_cert.buf, bogs, push_cert.buf + bogs,
644 push_cert.len - bogs, &sigcheck);
645 nonce_status = check_nonce(push_cert.buf, bogs);
647 }
648 if (!is_null_oid(&push_cert_oid)) {
649 argv_array_pushf(&proc->env_array, "GIT_PUSH_CERT=%s",
650 oid_to_hex(&push_cert_oid));
651 argv_array_pushf(&proc->env_array, "GIT_PUSH_CERT_SIGNER=%s",
652 sigcheck.signer ? sigcheck.signer : "");
653 argv_array_pushf(&proc->env_array, "GIT_PUSH_CERT_KEY=%s",
654 sigcheck.key ? sigcheck.key : "");
655 argv_array_pushf(&proc->env_array, "GIT_PUSH_CERT_STATUS=%c",
656 sigcheck.result);
657 if (push_cert_nonce) {
658 argv_array_pushf(&proc->env_array,
659 "GIT_PUSH_CERT_NONCE=%s",
660 push_cert_nonce);
661 argv_array_pushf(&proc->env_array,
662 "GIT_PUSH_CERT_NONCE_STATUS=%s",
663 nonce_status);
664 if (nonce_status == NONCE_SLOP)
665 argv_array_pushf(&proc->env_array,
666 "GIT_PUSH_CERT_NONCE_SLOP=%ld",
667 nonce_stamp_slop);
668 }
669 }
670}
671struct receive_hook_feed_state {
673 struct command *cmd;
674 int skip_broken;
675 struct strbuf buf;
676 const struct string_list *push_options;
677};
678typedef int (*feed_fn)(void *, const char **, size_t *);
680static int run_and_feed_hook(const char *hook_name, feed_fn feed,
681 struct receive_hook_feed_state *feed_state)
682{
683 struct child_process proc = CHILD_PROCESS_INIT;
684 struct async muxer;
685 const char *argv[2];
686 int code;
687 argv[0] = find_hook(hook_name);
689 if (!argv[0])
690 return 0;
691 argv[1] = NULL;
693 proc.argv = argv;
695 proc.in = -1;
696 proc.stdout_to_stderr = 1;
697 if (feed_state->push_options) {
698 int i;
699 for (i = 0; i < feed_state->push_options->nr; i++)
700 argv_array_pushf(&proc.env_array,
701 "GIT_PUSH_OPTION_%d=%s", i,
702 feed_state->push_options->items[i].string);
703 argv_array_pushf(&proc.env_array, "GIT_PUSH_OPTION_COUNT=%d",
704 feed_state->push_options->nr);
705 } else
706 argv_array_pushf(&proc.env_array, "GIT_PUSH_OPTION_COUNT");
707 if (tmp_objdir)
709 argv_array_pushv(&proc.env_array, tmp_objdir_env(tmp_objdir));
710 if (use_sideband) {
712 memset(&muxer, 0, sizeof(muxer));
713 muxer.proc = copy_to_sideband;
714 muxer.in = -1;
715 code = start_async(&muxer);
716 if (code)
717 return code;
718 proc.err = muxer.in;
719 }
720 prepare_push_cert_sha1(&proc);
722 code = start_command(&proc);
724 if (code) {
725 if (use_sideband)
726 finish_async(&muxer);
727 return code;
728 }
729 sigchain_push(SIGPIPE, SIG_IGN);
731 while (1) {
733 const char *buf;
734 size_t n;
735 if (feed(feed_state, &buf, &n))
736 break;
737 if (write_in_full(proc.in, buf, n) < 0)
738 break;
739 }
740 close(proc.in);
741 if (use_sideband)
742 finish_async(&muxer);
743 sigchain_pop(SIGPIPE);
745 return finish_command(&proc);
747}
748static int feed_receive_hook(void *state_, const char **bufp, size_t *sizep)
750{
751 struct receive_hook_feed_state *state = state_;
752 struct command *cmd = state->cmd;
753 while (cmd &&
755 state->skip_broken && (cmd->error_string || cmd->did_not_exist))
756 cmd = cmd->next;
757 if (!cmd)
758 return -1; /* EOF */
759 strbuf_reset(&state->buf);
760 strbuf_addf(&state->buf, "%s %s %s\n",
761 oid_to_hex(&cmd->old_oid), oid_to_hex(&cmd->new_oid),
762 cmd->ref_name);
763 state->cmd = cmd->next;
764 if (bufp) {
765 *bufp = state->buf.buf;
766 *sizep = state->buf.len;
767 }
768 return 0;
769}
770static int run_receive_hook(struct command *commands,
772 const char *hook_name,
773 int skip_broken,
774 const struct string_list *push_options)
775{
776 struct receive_hook_feed_state state;
777 int status;
778 strbuf_init(&state.buf, 0);
780 state.cmd = commands;
781 state.skip_broken = skip_broken;
782 if (feed_receive_hook(&state, NULL, NULL))
783 return 0;
784 state.cmd = commands;
785 state.push_options = push_options;
786 status = run_and_feed_hook(hook_name, feed_receive_hook, &state);
787 strbuf_release(&state.buf);
788 return status;
789}
790static int run_update_hook(struct command *cmd)
792{
793 const char *argv[5];
794 struct child_process proc = CHILD_PROCESS_INIT;
795 int code;
796 argv[0] = find_hook("update");
798 if (!argv[0])
799 return 0;
800 argv[1] = cmd->ref_name;
802 argv[2] = oid_to_hex(&cmd->old_oid);
803 argv[3] = oid_to_hex(&cmd->new_oid);
804 argv[4] = NULL;
805 proc.no_stdin = 1;
807 proc.stdout_to_stderr = 1;
808 proc.err = use_sideband ? -1 : 0;
809 proc.argv = argv;
810 code = start_command(&proc);
812 if (code)
813 return code;
814 if (use_sideband)
815 copy_to_sideband(proc.err, -1, NULL);
816 return finish_command(&proc);
817}
818static int is_ref_checked_out(const char *ref)
820{
821 if (is_bare_repository())
822 return 0;
823 if (!head_name)
825 return 0;
826 return !strcmp(head_name, ref);
827}
828static char *refuse_unconfigured_deny_msg =
830 N_("By default, updating the current branch in a non-bare repository\n"
831 "is denied, because it will make the index and work tree inconsistent\n"
832 "with what you pushed, and will require 'git reset --hard' to match\n"
833 "the work tree to HEAD.\n"
834 "\n"
835 "You can set the 'receive.denyCurrentBranch' configuration variable\n"
836 "to 'ignore' or 'warn' in the remote repository to allow pushing into\n"
837 "its current branch; however, this is not recommended unless you\n"
838 "arranged to update its work tree to match what you pushed in some\n"
839 "other way.\n"
840 "\n"
841 "To squelch this message and still keep the default behaviour, set\n"
842 "'receive.denyCurrentBranch' configuration variable to 'refuse'.");
843static void refuse_unconfigured_deny(void)
845{
846 rp_error("%s", _(refuse_unconfigured_deny_msg));
847}
848static char *refuse_unconfigured_deny_delete_current_msg =
850 N_("By default, deleting the current branch is denied, because the next\n"
851 "'git clone' won't result in any file checked out, causing confusion.\n"
852 "\n"
853 "You can set 'receive.denyDeleteCurrent' configuration variable to\n"
854 "'warn' or 'ignore' in the remote repository to allow deleting the\n"
855 "current branch, with or without a warning message.\n"
856 "\n"
857 "To squelch this message, you can set it to 'refuse'.");
858static void refuse_unconfigured_deny_delete_current(void)
860{
861 rp_error("%s", _(refuse_unconfigured_deny_delete_current_msg));
862}
863static int command_singleton_iterator(void *cb_data, struct object_id *oid);
865static int update_shallow_ref(struct command *cmd, struct shallow_info *si)
866{
867 struct lock_file shallow_lock = LOCK_INIT;
868 struct oid_array extra = OID_ARRAY_INIT;
869 struct check_connected_options opt = CHECK_CONNECTED_INIT;
870 uint32_t mask = 1 << (cmd->index % 32);
871 int i;
872 trace_printf_key(&trace_shallow,
874 "shallow: update_shallow_ref %s\n", cmd->ref_name);
875 for (i = 0; i < si->shallow->nr; i++)
876 if (si->used_shallow[i] &&
877 (si->used_shallow[i][cmd->index / 32] & mask) &&
878 !delayed_reachability_test(si, i))
879 oid_array_append(&extra, &si->shallow->oid[i]);
880 opt.env = tmp_objdir_env(tmp_objdir);
882 setup_alternate_shallow(&shallow_lock, &opt.shallow_file, &extra);
883 if (check_connected(command_singleton_iterator, cmd, &opt)) {
884 rollback_lock_file(&shallow_lock);
885 oid_array_clear(&extra);
886 return -1;
887 }
888 commit_lock_file(&shallow_lock);
890 /*
892 * Make sure setup_alternate_shallow() for the next ref does
893 * not lose these new roots..
894 */
895 for (i = 0; i < extra.nr; i++)
896 register_shallow(the_repository, &extra.oid[i]);
897 si->shallow_ref[cmd->index] = 0;
899 oid_array_clear(&extra);
900 return 0;
901}
902/*
904 * NEEDSWORK: we should consolidate various implementions of "are we
905 * on an unborn branch?" test into one, and make the unified one more
906 * robust. !get_sha1() based check used here and elsewhere would not
907 * allow us to tell an unborn branch from corrupt ref, for example.
908 * For the purpose of fixing "deploy-to-update does not work when
909 * pushing into an empty repository" issue, this should suffice for
910 * now.
911 */
912static int head_has_history(void)
913{
914 struct object_id oid;
915 return !get_oid("HEAD", &oid);
917}
918static const char *push_to_deploy(unsigned char *sha1,
920 struct argv_array *env,
921 const char *work_tree)
922{
923 const char *update_refresh[] = {
924 "update-index", "-q", "--ignore-submodules", "--refresh", NULL
925 };
926 const char *diff_files[] = {
927 "diff-files", "--quiet", "--ignore-submodules", "--", NULL
928 };
929 const char *diff_index[] = {
930 "diff-index", "--quiet", "--cached", "--ignore-submodules",
931 NULL, "--", NULL
932 };
933 const char *read_tree[] = {
934 "read-tree", "-u", "-m", NULL, NULL
935 };
936 struct child_process child = CHILD_PROCESS_INIT;
937 child.argv = update_refresh;
939 child.env = env->argv;
940 child.dir = work_tree;
941 child.no_stdin = 1;
942 child.stdout_to_stderr = 1;
943 child.git_cmd = 1;
944 if (run_command(&child))
945 return "Up-to-date check failed";
946 /* run_command() does not clean up completely; reinitialize */
948 child_process_init(&child);
949 child.argv = diff_files;
950 child.env = env->argv;
951 child.dir = work_tree;
952 child.no_stdin = 1;
953 child.stdout_to_stderr = 1;
954 child.git_cmd = 1;
955 if (run_command(&child))
956 return "Working directory has unstaged changes";
957 /* diff-index with either HEAD or an empty tree */
959 diff_index[4] = head_has_history() ? "HEAD" : empty_tree_oid_hex();
960 child_process_init(&child);
962 child.argv = diff_index;
963 child.env = env->argv;
964 child.no_stdin = 1;
965 child.no_stdout = 1;
966 child.stdout_to_stderr = 0;
967 child.git_cmd = 1;
968 if (run_command(&child))
969 return "Working directory has staged changes";
970 read_tree[3] = sha1_to_hex(sha1);
972 child_process_init(&child);
973 child.argv = read_tree;
974 child.env = env->argv;
975 child.dir = work_tree;
976 child.no_stdin = 1;
977 child.no_stdout = 1;
978 child.stdout_to_stderr = 0;
979 child.git_cmd = 1;
980 if (run_command(&child))
981 return "Could not update working tree to new HEAD";
982 return NULL;
984}
985static const char *push_to_checkout_hook = "push-to-checkout";
987static const char *push_to_checkout(unsigned char *sha1,
989 struct argv_array *env,
990 const char *work_tree)
991{
992 argv_array_pushf(env, "GIT_WORK_TREE=%s", absolute_path(work_tree));
993 if (run_hook_le(env->argv, push_to_checkout_hook,
994 sha1_to_hex(sha1), NULL))
995 return "push-to-checkout hook declined";
996 else
997 return NULL;
998}
999static const char *update_worktree(unsigned char *sha1)
1001{
1002 const char *retval;
1003 const char *work_tree = git_work_tree_cfg ? git_work_tree_cfg : "..";
1004 struct argv_array env = ARGV_ARRAY_INIT;
1005 if (is_bare_repository())
1007 return "denyCurrentBranch = updateInstead needs a worktree";
1008 argv_array_pushf(&env, "GIT_DIR=%s", absolute_path(get_git_dir()));
1010 if (!find_hook(push_to_checkout_hook))
1012 retval = push_to_deploy(sha1, &env, work_tree);
1013 else
1014 retval = push_to_checkout(sha1, &env, work_tree);
1015 argv_array_clear(&env);
1017 return retval;
1018}
1019static const char *update(struct command *cmd, struct shallow_info *si)
1021{
1022 const char *name = cmd->ref_name;
1023 struct strbuf namespaced_name_buf = STRBUF_INIT;
1024 static char *namespaced_name;
1025 const char *ret;
1026 struct object_id *old_oid = &cmd->old_oid;
1027 struct object_id *new_oid = &cmd->new_oid;
1028 int do_update_worktree = 0;
1029 /* only refs/... are allowed */
1031 if (!starts_with(name, "refs/") || check_refname_format(name + 5, 0)) {
1032 rp_error("refusing to create funny ref '%s' remotely", name);
1033 return "funny refname";
1034 }
1035 strbuf_addf(&namespaced_name_buf, "%s%s", get_git_namespace(), name);
1037 free(namespaced_name);
1038 namespaced_name = strbuf_detach(&namespaced_name_buf, NULL);
1039 if (is_ref_checked_out(namespaced_name)) {
1041 switch (deny_current_branch) {
1042 case DENY_IGNORE:
1043 break;
1044 case DENY_WARN:
1045 rp_warning("updating the current branch");
1046 break;
1047 case DENY_REFUSE:
1048 case DENY_UNCONFIGURED:
1049 rp_error("refusing to update checked out branch: %s", name);
1050 if (deny_current_branch == DENY_UNCONFIGURED)
1051 refuse_unconfigured_deny();
1052 return "branch is currently checked out";
1053 case DENY_UPDATE_INSTEAD:
1054 /* pass -- let other checks intervene first */
1055 do_update_worktree = 1;
1056 break;
1057 }
1058 }
1059 if (!is_null_oid(new_oid) && !has_object_file(new_oid)) {
1061 error("unpack should have generated %s, "
1062 "but I can't find it!", oid_to_hex(new_oid));
1063 return "bad pack";
1064 }
1065 if (!is_null_oid(old_oid) && is_null_oid(new_oid)) {
1067 if (deny_deletes && starts_with(name, "refs/heads/")) {
1068 rp_error("denying ref deletion for %s", name);
1069 return "deletion prohibited";
1070 }
1071 if (head_name && !strcmp(namespaced_name, head_name)) {
1073 switch (deny_delete_current) {
1074 case DENY_IGNORE:
1075 break;
1076 case DENY_WARN:
1077 rp_warning("deleting the current branch");
1078 break;
1079 case DENY_REFUSE:
1080 case DENY_UNCONFIGURED:
1081 case DENY_UPDATE_INSTEAD:
1082 if (deny_delete_current == DENY_UNCONFIGURED)
1083 refuse_unconfigured_deny_delete_current();
1084 rp_error("refusing to delete the current branch: %s", name);
1085 return "deletion of the current branch prohibited";
1086 default:
1087 return "Invalid denyDeleteCurrent setting";
1088 }
1089 }
1090 }
1091 if (deny_non_fast_forwards && !is_null_oid(new_oid) &&
1093 !is_null_oid(old_oid) &&
1094 starts_with(name, "refs/heads/")) {
1095 struct object *old_object, *new_object;
1096 struct commit *old_commit, *new_commit;
1097 old_object = parse_object(the_repository, old_oid);
1099 new_object = parse_object(the_repository, new_oid);
1100 if (!old_object || !new_object ||
1102 old_object->type != OBJ_COMMIT ||
1103 new_object->type != OBJ_COMMIT) {
1104 error("bad sha1 objects for %s", name);
1105 return "bad ref";
1106 }
1107 old_commit = (struct commit *)old_object;
1108 new_commit = (struct commit *)new_object;
1109 if (!in_merge_bases(old_commit, new_commit)) {
1110 rp_error("denying non-fast-forward %s"
1111 " (you should pull first)", name);
1112 return "non-fast-forward";
1113 }
1114 }
1115 if (run_update_hook(cmd)) {
1116 rp_error("hook declined to update %s", name);
1117 return "hook declined";
1118 }
1119 if (do_update_worktree) {
1121 ret = update_worktree(new_oid->hash);
1122 if (ret)
1123 return ret;
1124 }
1125 if (is_null_oid(new_oid)) {
1127 struct strbuf err = STRBUF_INIT;
1128 if (!parse_object(the_repository, old_oid)) {
1129 old_oid = NULL;
1130 if (ref_exists(name)) {
1131 rp_warning("Allowing deletion of corrupt ref.");
1132 } else {
1133 rp_warning("Deleting a non-existent ref.");
1134 cmd->did_not_exist = 1;
1135 }
1136 }
1137 if (ref_transaction_delete(transaction,
1138 namespaced_name,
1139 old_oid,
1140 0, "push", &err)) {
1141 rp_error("%s", err.buf);
1142 strbuf_release(&err);
1143 return "failed to delete";
1144 }
1145 strbuf_release(&err);
1146 return NULL; /* good */
1147 }
1148 else {
1149 struct strbuf err = STRBUF_INIT;
1150 if (shallow_update && si->shallow_ref[cmd->index] &&
1151 update_shallow_ref(cmd, si))
1152 return "shallow error";
1153 if (ref_transaction_update(transaction,
1155 namespaced_name,
1156 new_oid, old_oid,
1157 0, "push",
1158 &err)) {
1159 rp_error("%s", err.buf);
1160 strbuf_release(&err);
1161 return "failed to update ref";
1163 }
1164 strbuf_release(&err);
1165 return NULL; /* good */
1167 }
1168}
1169static void run_update_post_hook(struct command *commands)
1171{
1172 struct command *cmd;
1173 struct child_process proc = CHILD_PROCESS_INIT;
1174 const char *hook;
1175 hook = find_hook("post-update");
1177 if (!hook)
1178 return;
1179 for (cmd = commands; cmd; cmd = cmd->next) {
1181 if (cmd->error_string || cmd->did_not_exist)
1182 continue;
1183 if (!proc.args.argc)
1184 argv_array_push(&proc.args, hook);
1185 argv_array_push(&proc.args, cmd->ref_name);
1186 }
1187 if (!proc.args.argc)
1188 return;
1189 proc.no_stdin = 1;
1191 proc.stdout_to_stderr = 1;
1192 proc.err = use_sideband ? -1 : 0;
1193 if (!start_command(&proc)) {
1195 if (use_sideband)
1196 copy_to_sideband(proc.err, -1, NULL);
1197 finish_command(&proc);
1198 }
1199}
1200static void check_aliased_update(struct command *cmd, struct string_list *list)
1202{
1203 struct strbuf buf = STRBUF_INIT;
1204 const char *dst_name;
1205 struct string_list_item *item;
1206 struct command *dst_cmd;
1207 int flag;
1208 strbuf_addf(&buf, "%s%s", get_git_namespace(), cmd->ref_name);
1210 dst_name = resolve_ref_unsafe(buf.buf, 0, NULL, &flag);
1211 strbuf_release(&buf);
1212 if (!(flag & REF_ISSYMREF))
1214 return;
1215 if (!dst_name) {
1217 rp_error("refusing update to broken symref '%s'", cmd->ref_name);
1218 cmd->skip_update = 1;
1219 cmd->error_string = "broken symref";
1220 return;
1221 }
1222 dst_name = strip_namespace(dst_name);
1223 if ((item = string_list_lookup(list, dst_name)) == NULL)
1225 return;
1226 cmd->skip_update = 1;
1228 dst_cmd = (struct command *) item->util;
1230 if (oideq(&cmd->old_oid, &dst_cmd->old_oid) &&
1232 oideq(&cmd->new_oid, &dst_cmd->new_oid))
1233 return;
1234 dst_cmd->skip_update = 1;
1236 rp_error("refusing inconsistent update between symref '%s' (%s..%s) and"
1238 " its target '%s' (%s..%s)",
1239 cmd->ref_name,
1240 find_unique_abbrev(&cmd->old_oid, DEFAULT_ABBREV),
1241 find_unique_abbrev(&cmd->new_oid, DEFAULT_ABBREV),
1242 dst_cmd->ref_name,
1243 find_unique_abbrev(&dst_cmd->old_oid, DEFAULT_ABBREV),
1244 find_unique_abbrev(&dst_cmd->new_oid, DEFAULT_ABBREV));
1245 cmd->error_string = dst_cmd->error_string =
1247 "inconsistent aliased update";
1248}
1249static void check_aliased_updates(struct command *commands)
1251{
1252 struct command *cmd;
1253 struct string_list ref_list = STRING_LIST_INIT_NODUP;
1254 for (cmd = commands; cmd; cmd = cmd->next) {
1256 struct string_list_item *item =
1257 string_list_append(&ref_list, cmd->ref_name);
1258 item->util = (void *)cmd;
1259 }
1260 string_list_sort(&ref_list);
1261 for (cmd = commands; cmd; cmd = cmd->next) {
1263 if (!cmd->error_string)
1264 check_aliased_update(cmd, &ref_list);
1265 }
1266 string_list_clear(&ref_list, 0);
1268}
1269static int command_singleton_iterator(void *cb_data, struct object_id *oid)
1271{
1272 struct command **cmd_list = cb_data;
1273 struct command *cmd = *cmd_list;
1274 if (!cmd || is_null_oid(&cmd->new_oid))
1276 return -1; /* end of list */
1277 *cmd_list = NULL; /* this returns only one */
1278 oidcpy(oid, &cmd->new_oid);
1279 return 0;
1280}
1281static void set_connectivity_errors(struct command *commands,
1283 struct shallow_info *si)
1284{
1285 struct command *cmd;
1286 for (cmd = commands; cmd; cmd = cmd->next) {
1288 struct command *singleton = cmd;
1289 struct check_connected_options opt = CHECK_CONNECTED_INIT;
1290 if (shallow_update && si->shallow_ref[cmd->index])
1292 /* to be checked in update_shallow_ref() */
1293 continue;
1294 opt.env = tmp_objdir_env(tmp_objdir);
1296 if (!check_connected(command_singleton_iterator, &singleton,
1297 &opt))
1298 continue;
1299 cmd->error_string = "missing necessary objects";
1301 }
1302}
1303struct iterate_data {
1305 struct command *cmds;
1306 struct shallow_info *si;
1307};
1308static int iterate_receive_command_list(void *cb_data, struct object_id *oid)
1310{
1311 struct iterate_data *data = cb_data;
1312 struct command **cmd_list = &data->cmds;
1313 struct command *cmd = *cmd_list;
1314 for (; cmd; cmd = cmd->next) {
1316 if (shallow_update && data->si->shallow_ref[cmd->index])
1317 /* to be checked in update_shallow_ref() */
1318 continue;
1319 if (!is_null_oid(&cmd->new_oid) && !cmd->skip_update) {
1320 oidcpy(oid, &cmd->new_oid);
1321 *cmd_list = cmd->next;
1322 return 0;
1323 }
1324 }
1325 *cmd_list = NULL;
1326 return -1; /* end of list */
1327}
1328static void reject_updates_to_hidden(struct command *commands)
1330{
1331 struct strbuf refname_full = STRBUF_INIT;
1332 size_t prefix_len;
1333 struct command *cmd;
1334 strbuf_addstr(&refname_full, get_git_namespace());
1336 prefix_len = refname_full.len;
1337 for (cmd = commands; cmd; cmd = cmd->next) {
1339 if (cmd->error_string)
1340 continue;
1341 strbuf_setlen(&refname_full, prefix_len);
1343 strbuf_addstr(&refname_full, cmd->ref_name);
1344 if (!ref_is_hidden(cmd->ref_name, refname_full.buf))
1346 continue;
1347 if (is_null_oid(&cmd->new_oid))
1348 cmd->error_string = "deny deleting a hidden ref";
1349 else
1350 cmd->error_string = "deny updating a hidden ref";
1351 }
1352 strbuf_release(&refname_full);
1354}
1355static int should_process_cmd(struct command *cmd)
1357{
1358 return !cmd->error_string && !cmd->skip_update;
1359}
1360static void warn_if_skipped_connectivity_check(struct command *commands,
1362 struct shallow_info *si)
1363{
1364 struct command *cmd;
1365 int checked_connectivity = 1;
1366 for (cmd = commands; cmd; cmd = cmd->next) {
1368 if (should_process_cmd(cmd) && si->shallow_ref[cmd->index]) {
1369 error("BUG: connectivity check has not been run on ref %s",
1370 cmd->ref_name);
1371 checked_connectivity = 0;
1372 }
1373 }
1374 if (!checked_connectivity)
1375 BUG("connectivity check skipped???");
1376}
1377static void execute_commands_non_atomic(struct command *commands,
1379 struct shallow_info *si)
1380{
1381 struct command *cmd;
1382 struct strbuf err = STRBUF_INIT;
1383 for (cmd = commands; cmd; cmd = cmd->next) {
1385 if (!should_process_cmd(cmd))
1386 continue;
1387 transaction = ref_transaction_begin(&err);
1389 if (!transaction) {
1390 rp_error("%s", err.buf);
1391 strbuf_reset(&err);
1392 cmd->error_string = "transaction failed to start";
1393 continue;
1394 }
1395 cmd->error_string = update(cmd, si);
1397 if (!cmd->error_string
1399 && ref_transaction_commit(transaction, &err)) {
1400 rp_error("%s", err.buf);
1401 strbuf_reset(&err);
1402 cmd->error_string = "failed to update ref";
1403 }
1404 ref_transaction_free(transaction);
1405 }
1406 strbuf_release(&err);
1407}
1408static void execute_commands_atomic(struct command *commands,
1410 struct shallow_info *si)
1411{
1412 struct command *cmd;
1413 struct strbuf err = STRBUF_INIT;
1414 const char *reported_error = "atomic push failure";
1415 transaction = ref_transaction_begin(&err);
1417 if (!transaction) {
1418 rp_error("%s", err.buf);
1419 strbuf_reset(&err);
1420 reported_error = "transaction failed to start";
1421 goto failure;
1422 }
1423 for (cmd = commands; cmd; cmd = cmd->next) {
1425 if (!should_process_cmd(cmd))
1426 continue;
1427 cmd->error_string = update(cmd, si);
1429 if (cmd->error_string)
1431 goto failure;
1432 }
1433 if (ref_transaction_commit(transaction, &err)) {
1435 rp_error("%s", err.buf);
1436 reported_error = "atomic transaction failed";
1437 goto failure;
1438 }
1439 goto cleanup;
1440failure:
1442 for (cmd = commands; cmd; cmd = cmd->next)
1443 if (!cmd->error_string)
1444 cmd->error_string = reported_error;
1445cleanup:
1447 ref_transaction_free(transaction);
1448 strbuf_release(&err);
1449}
1450static void execute_commands(struct command *commands,
1452 const char *unpacker_error,
1453 struct shallow_info *si,
1454 const struct string_list *push_options)
1455{
1456 struct check_connected_options opt = CHECK_CONNECTED_INIT;
1457 struct command *cmd;
1458 struct iterate_data data;
1459 struct async muxer;
1460 int err_fd = 0;
1461 if (unpacker_error) {
1463 for (cmd = commands; cmd; cmd = cmd->next)
1464 cmd->error_string = "unpacker error";
1465 return;
1466 }
1467 if (use_sideband) {
1469 memset(&muxer, 0, sizeof(muxer));
1470 muxer.proc = copy_to_sideband;
1471 muxer.in = -1;
1472 if (!start_async(&muxer))
1473 err_fd = muxer.in;
1474 /* ...else, continue without relaying sideband */
1475 }
1476 data.cmds = commands;
1478 data.si = si;
1479 opt.err_fd = err_fd;
1480 opt.progress = err_fd && !quiet;
1481 opt.env = tmp_objdir_env(tmp_objdir);
1482 if (check_connected(iterate_receive_command_list, &data, &opt))
1483 set_connectivity_errors(commands, si);
1484 if (use_sideband)
1486 finish_async(&muxer);
1487 reject_updates_to_hidden(commands);
1489 if (run_receive_hook(commands, "pre-receive", 0, push_options)) {
1491 for (cmd = commands; cmd; cmd = cmd->next) {
1492 if (!cmd->error_string)
1493 cmd->error_string = "pre-receive hook declined";
1494 }
1495 return;
1496 }
1497 /*
1499 * Now we'll start writing out refs, which means the objects need
1500 * to be in their final positions so that other processes can see them.
1501 */
1502 if (tmp_objdir_migrate(tmp_objdir) < 0) {
1503 for (cmd = commands; cmd; cmd = cmd->next) {
1504 if (!cmd->error_string)
1505 cmd->error_string = "unable to migrate objects to permanent storage";
1506 }
1507 return;
1508 }
1509 tmp_objdir = NULL;
1510 check_aliased_updates(commands);
1512 free(head_name_to_free);
1514 head_name = head_name_to_free = resolve_refdup("HEAD", 0, NULL, NULL);
1515 if (use_atomic)
1517 execute_commands_atomic(commands, si);
1518 else
1519 execute_commands_non_atomic(commands, si);
1520 if (shallow_update)
1522 warn_if_skipped_connectivity_check(commands, si);
1523}
1524static struct command **queue_command(struct command **tail,
1526 const char *line,
1527 int linelen)
1528{
1529 struct object_id old_oid, new_oid;
1530 struct command *cmd;
1531 const char *refname;
1532 int reflen;
1533 const char *p;
1534 if (parse_oid_hex(line, &old_oid, &p) ||
1536 *p++ != ' ' ||
1537 parse_oid_hex(p, &new_oid, &p) ||
1538 *p++ != ' ')
1539 die("protocol error: expected old/new/ref, got '%s'", line);
1540 refname = p;
1542 reflen = linelen - (p - line);
1543 FLEX_ALLOC_MEM(cmd, ref_name, refname, reflen);
1544 oidcpy(&cmd->old_oid, &old_oid);
1545 oidcpy(&cmd->new_oid, &new_oid);
1546 *tail = cmd;
1547 return &cmd->next;
1548}
1549static void queue_commands_from_cert(struct command **tail,
1551 struct strbuf *push_cert)
1552{
1553 const char *boc, *eoc;
1554 if (*tail)
1556 die("protocol error: got both push certificate and unsigned commands");
1557 boc = strstr(push_cert->buf, "\n\n");
1559 if (!boc)
1560 die("malformed push certificate %.*s", 100, push_cert->buf);
1561 else
1562 boc += 2;
1563 eoc = push_cert->buf + parse_signature(push_cert->buf, push_cert->len);
1564 while (boc < eoc) {
1566 const char *eol = memchr(boc, '\n', eoc - boc);
1567 tail = queue_command(tail, boc, eol ? eol - boc : eoc - boc);
1568 boc = eol ? eol + 1 : eoc;
1569 }
1570}
1571static struct command *read_head_info(struct oid_array *shallow)
1573{
1574 struct command *commands = NULL;
1575 struct command **p = &commands;
1576 for (;;) {
1577 char *line;
1578 int len, linelen;
1579 line = packet_read_line(0, &len);
1581 if (!line)
1582 break;
1583 if (len > 8 && starts_with(line, "shallow ")) {
1585 struct object_id oid;
1586 if (get_oid_hex(line + 8, &oid))
1587 die("protocol error: expected shallow sha, got '%s'",
1588 line + 8);
1589 oid_array_append(shallow, &oid);
1590 continue;
1591 }
1592 linelen = strlen(line);
1594 if (linelen < len) {
1595 const char *feature_list = line + linelen + 1;
1596 if (parse_feature_request(feature_list, "report-status"))
1597 report_status = 1;
1598 if (parse_feature_request(feature_list, "side-band-64k"))
1599 use_sideband = LARGE_PACKET_MAX;
1600 if (parse_feature_request(feature_list, "quiet"))
1601 quiet = 1;
1602 if (advertise_atomic_push
1603 && parse_feature_request(feature_list, "atomic"))
1604 use_atomic = 1;
1605 if (advertise_push_options
1606 && parse_feature_request(feature_list, "push-options"))
1607 use_push_options = 1;
1608 }
1609 if (!strcmp(line, "push-cert")) {
1611 int true_flush = 0;
1612 char certbuf[1024];
1613 for (;;) {
1615 len = packet_read(0, NULL, NULL,
1616 certbuf, sizeof(certbuf), 0);
1617 if (!len) {
1618 true_flush = 1;
1619 break;
1620 }
1621 if (!strcmp(certbuf, "push-cert-end\n"))
1622 break; /* end of cert */
1623 strbuf_addstr(&push_cert, certbuf);
1624 }
1625 if (true_flush)
1627 break;
1628 continue;
1629 }
1630 p = queue_command(p, line, linelen);
1632 }
1633 if (push_cert.len)
1635 queue_commands_from_cert(p, &push_cert);
1636 return commands;
1638}
1639static void read_push_options(struct string_list *options)
1641{
1642 while (1) {
1643 char *line;
1644 int len;
1645 line = packet_read_line(0, &len);
1647 if (!line)
1649 break;
1650 string_list_append(options, line);
1652 }
1653}
1654static const char *parse_pack_header(struct pack_header *hdr)
1656{
1657 switch (read_pack_header(0, hdr)) {
1658 case PH_ERROR_EOF:
1659 return "eof before pack header was fully read";
1660 case PH_ERROR_PACK_SIGNATURE:
1662 return "protocol error (pack signature mismatch detected)";
1663 case PH_ERROR_PROTOCOL:
1665 return "protocol error (pack version unsupported)";
1666 default:
1668 return "unknown error in parse_pack_header";
1669 case 0:
1671 return NULL;
1672 }
1673}
1674static const char *pack_lockfile;
1676static void push_header_arg(struct argv_array *args, struct pack_header *hdr)
1678{
1679 argv_array_pushf(args, "--pack_header=%"PRIu32",%"PRIu32,
1680 ntohl(hdr->hdr_version), ntohl(hdr->hdr_entries));
1681}
1682static const char *unpack(int err_fd, struct shallow_info *si)
1684{
1685 struct pack_header hdr;
1686 const char *hdr_err;
1687 int status;
1688 struct child_process child = CHILD_PROCESS_INIT;
1689 int fsck_objects = (receive_fsck_objects >= 0
1690 ? receive_fsck_objects
1691 : transfer_fsck_objects >= 0
1692 ? transfer_fsck_objects
1693 : 0);
1694 hdr_err = parse_pack_header(&hdr);
1696 if (hdr_err) {
1697 if (err_fd > 0)
1698 close(err_fd);
1699 return hdr_err;
1700 }
1701 if (si->nr_ours || si->nr_theirs) {
1703 alt_shallow_file = setup_temporary_shallow(si->shallow);
1704 argv_array_push(&child.args, "--shallow-file");
1705 argv_array_push(&child.args, alt_shallow_file);
1706 }
1707 tmp_objdir = tmp_objdir_create();
1709 if (!tmp_objdir) {
1710 if (err_fd > 0)
1711 close(err_fd);
1712 return "unable to create temporary object directory";
1713 }
1714 child.env = tmp_objdir_env(tmp_objdir);
1715 /*
1717 * Normally we just pass the tmp_objdir environment to the child
1718 * processes that do the heavy lifting, but we may need to see these
1719 * objects ourselves to set up shallow information.
1720 */
1721 tmp_objdir_add_as_alternate(tmp_objdir);
1722 if (ntohl(hdr.hdr_entries) < unpack_limit) {
1724 argv_array_push(&child.args, "unpack-objects");
1725 push_header_arg(&child.args, &hdr);
1726 if (quiet)
1727 argv_array_push(&child.args, "-q");
1728 if (fsck_objects)
1729 argv_array_pushf(&child.args, "--strict%s",
1730 fsck_msg_types.buf);
1731 if (max_input_size)
1732 argv_array_pushf(&child.args, "--max-input-size=%"PRIuMAX,
1733 (uintmax_t)max_input_size);
1734 child.no_stdout = 1;
1735 child.err = err_fd;
1736 child.git_cmd = 1;
1737 status = run_command(&child);
1738 if (status)
1739 return "unpack-objects abnormal exit";
1740 } else {
1741 char hostname[HOST_NAME_MAX + 1];
1742 argv_array_pushl(&child.args, "index-pack", "--stdin", NULL);
1744 push_header_arg(&child.args, &hdr);
1745 if (xgethostname(hostname, sizeof(hostname)))
1747 xsnprintf(hostname, sizeof(hostname), "localhost");
1748 argv_array_pushf(&child.args,
1749 "--keep=receive-pack %"PRIuMAX" on %s",
1750 (uintmax_t)getpid(),
1751 hostname);
1752 if (!quiet && err_fd)
1754 argv_array_push(&child.args, "--show-resolving-progress");
1755 if (use_sideband)
1756 argv_array_push(&child.args, "--report-end-of-input");
1757 if (fsck_objects)
1758 argv_array_pushf(&child.args, "--strict%s",
1759 fsck_msg_types.buf);
1760 if (!reject_thin)
1761 argv_array_push(&child.args, "--fix-thin");
1762 if (max_input_size)
1763 argv_array_pushf(&child.args, "--max-input-size=%"PRIuMAX,
1764 (uintmax_t)max_input_size);
1765 child.out = -1;
1766 child.err = err_fd;
1767 child.git_cmd = 1;
1768 status = start_command(&child);
1769 if (status)
1770 return "index-pack fork failed";
1771 pack_lockfile = index_pack_lockfile(child.out);
1772 close(child.out);
1773 status = finish_command(&child);
1774 if (status)
1775 return "index-pack abnormal exit";
1776 reprepare_packed_git(the_repository);
1777 }
1778 return NULL;
1779}
1780static const char *unpack_with_sideband(struct shallow_info *si)
1782{
1783 struct async muxer;
1784 const char *ret;
1785 if (!use_sideband)
1787 return unpack(0, si);
1788 use_keepalive = KEEPALIVE_AFTER_NUL;
1790 memset(&muxer, 0, sizeof(muxer));
1791 muxer.proc = copy_to_sideband;
1792 muxer.in = -1;
1793 if (start_async(&muxer))
1794 return NULL;
1795 ret = unpack(muxer.in, si);
1797 finish_async(&muxer);
1799 return ret;
1800}
1801static void prepare_shallow_update(struct command *commands,
1803 struct shallow_info *si)
1804{
1805 int i, j, k, bitmap_size = DIV_ROUND_UP(si->ref->nr, 32);
1806 ALLOC_ARRAY(si->used_shallow, si->shallow->nr);
1808 assign_shallow_commits_to_refs(si, si->used_shallow, NULL);
1809 si->need_reachability_test =
1811 xcalloc(si->shallow->nr, sizeof(*si->need_reachability_test));
1812 si->reachable =
1813 xcalloc(si->shallow->nr, sizeof(*si->reachable));
1814 si->shallow_ref = xcalloc(si->ref->nr, sizeof(*si->shallow_ref));
1815 for (i = 0; i < si->nr_ours; i++)
1817 si->need_reachability_test[si->ours[i]] = 1;
1818 for (i = 0; i < si->shallow->nr; i++) {
1820 if (!si->used_shallow[i])
1821 continue;
1822 for (j = 0; j < bitmap_size; j++) {
1823 if (!si->used_shallow[i][j])
1824 continue;
1825 si->need_reachability_test[i]++;
1826 for (k = 0; k < 32; k++)
1827 if (si->used_shallow[i][j] & (1U << k))
1828 si->shallow_ref[j * 32 + k]++;
1829 }
1830 /*
1832 * true for those associated with some refs and belong
1833 * in "ours" list aka "step 7 not done yet"
1834 */
1835 si->need_reachability_test[i] =
1836 si->need_reachability_test[i] > 1;
1837 }
1838 /*
1840 * keep hooks happy by forcing a temporary shallow file via
1841 * env variable because we can't add --shallow-file to every
1842 * command. check_connected() will be done with
1843 * true .git/shallow though.
1844 */
1845 setenv(GIT_SHALLOW_FILE_ENVIRONMENT, alt_shallow_file, 1);
1846}
1847static void update_shallow_info(struct command *commands,
1849 struct shallow_info *si,
1850 struct oid_array *ref)
1851{
1852 struct command *cmd;
1853 int *ref_status;
1854 remove_nonexistent_theirs_shallow(si);
1855 if (!si->nr_ours && !si->nr_theirs) {
1856 shallow_update = 0;
1857 return;
1858 }
1859 for (cmd = commands; cmd; cmd = cmd->next) {
1861 if (is_null_oid(&cmd->new_oid))
1862 continue;
1863 oid_array_append(ref, &cmd->new_oid);
1864 cmd->index = ref->nr - 1;
1865 }
1866 si->ref = ref;
1867 if (shallow_update) {
1869 prepare_shallow_update(commands, si);
1870 return;
1871 }
1872 ALLOC_ARRAY(ref_status, ref->nr);
1874 assign_shallow_commits_to_refs(si, NULL, ref_status);
1875 for (cmd = commands; cmd; cmd = cmd->next) {
1876 if (is_null_oid(&cmd->new_oid))
1877 continue;
1878 if (ref_status[cmd->index]) {
1879 cmd->error_string = "shallow update not allowed";
1880 cmd->skip_update = 1;
1881 }
1882 }
1883 free(ref_status);
1884}
1885static void report(struct command *commands, const char *unpack_status)
1887{
1888 struct command *cmd;
1889 struct strbuf buf = STRBUF_INIT;
1890 packet_buf_write(&buf, "unpack %s\n",
1892 unpack_status ? unpack_status : "ok");
1893 for (cmd = commands; cmd; cmd = cmd->next) {
1894 if (!cmd->error_string)
1895 packet_buf_write(&buf, "ok %s\n",
1896 cmd->ref_name);
1897 else
1898 packet_buf_write(&buf, "ng %s %s\n",
1899 cmd->ref_name, cmd->error_string);
1900 }
1901 packet_buf_flush(&buf);
1902 if (use_sideband)
1904 send_sideband(1, 1, buf.buf, buf.len, use_sideband);
1905 else
1906 write_or_die(1, buf.buf, buf.len);
1907 strbuf_release(&buf);
1908}
1909static int delete_only(struct command *commands)
1911{
1912 struct command *cmd;
1913 for (cmd = commands; cmd; cmd = cmd->next) {
1914 if (!is_null_oid(&cmd->new_oid))
1915 return 0;
1916 }
1917 return 1;
1918}
1919int cmd_receive_pack(int argc, const char **argv, const char *prefix)
1921{
1922 int advertise_refs = 0;
1923 struct command *commands;
1924 struct oid_array shallow = OID_ARRAY_INIT;
1925 struct oid_array ref = OID_ARRAY_INIT;
1926 struct shallow_info si;
1927 struct option options[] = {
1929 OPT__QUIET(&quiet, N_("quiet")),
1930 OPT_HIDDEN_BOOL(0, "stateless-rpc", &stateless_rpc, NULL),
1931 OPT_HIDDEN_BOOL(0, "advertise-refs", &advertise_refs, NULL),
1932 OPT_HIDDEN_BOOL(0, "reject-thin-pack-for-testing", &reject_thin, NULL),
1933 OPT_END()
1934 };
1935 packet_trace_identity("receive-pack");
1937 argc = parse_options(argc, argv, prefix, options, receive_pack_usage, 0);
1939 if (argc > 1)
1941 usage_msg_opt(_("Too many arguments."), receive_pack_usage, options);
1942 if (argc == 0)
1943 usage_msg_opt(_("You must specify a directory."), receive_pack_usage, options);
1944 service_dir = argv[0];
1946 setup_path();
1948 if (!enter_repo(service_dir, 0))
1950 die("'%s' does not appear to be a git repository", service_dir);
1951 git_config(receive_pack_config, NULL);
1953 if (cert_nonce_seed)
1954 push_cert_nonce = prepare_push_cert_nonce(service_dir, time(NULL));
1955 if (0 <= transfer_unpack_limit)
1957 unpack_limit = transfer_unpack_limit;
1958 else if (0 <= receive_unpack_limit)
1959 unpack_limit = receive_unpack_limit;
1960 switch (determine_protocol_version_server()) {
1962 case protocol_v2:
1963 /*
1964 * push support for protocol v2 has not been implemented yet,
1965 * so ignore the request to use v2 and fallback to using v0.
1966 */
1967 break;
1968 case protocol_v1:
1969 /*
1970 * v1 is just the original protocol with a version string,
1971 * so just fall through after writing the version string.
1972 */
1973 if (advertise_refs || !stateless_rpc)
1974 packet_write_fmt(1, "version 1\n");
1975 /* fallthrough */
1977 case protocol_v0:
1978 break;
1979 case protocol_unknown_version:
1980 BUG("unknown protocol version");
1981 }
1982 if (advertise_refs || !stateless_rpc) {
1984 write_head_info();
1985 }
1986 if (advertise_refs)
1987 return 0;
1988 if ((commands = read_head_info(&shallow)) != NULL) {
1990 const char *unpack_status = NULL;
1991 struct string_list push_options = STRING_LIST_INIT_DUP;
1992 if (use_push_options)
1994 read_push_options(&push_options);
1995 if (!check_cert_push_options(&push_options)) {
1996 struct command *cmd;
1997 for (cmd = commands; cmd; cmd = cmd->next)
1998 cmd->error_string = "inconsistent push options";
1999 }
2000 prepare_shallow_info(&si, &shallow);
2002 if (!si.nr_ours && !si.nr_theirs)
2003 shallow_update = 0;
2004 if (!delete_only(commands)) {
2005 unpack_status = unpack_with_sideband(&si);
2006 update_shallow_info(commands, &si, &ref);
2007 }
2008 use_keepalive = KEEPALIVE_ALWAYS;
2009 execute_commands(commands, unpack_status, &si,
2010 &push_options);
2011 if (pack_lockfile)
2012 unlink_or_warn(pack_lockfile);
2013 if (report_status)
2014 report(commands, unpack_status);
2015 run_receive_hook(commands, "post-receive", 1,
2016 &push_options);
2017 run_update_post_hook(commands);
2018 string_list_clear(&push_options, 0);
2019 if (auto_gc) {
2020 const char *argv_gc_auto[] = {
2021 "gc", "--auto", "--quiet", NULL,
2022 };
2023 struct child_process proc = CHILD_PROCESS_INIT;
2024 proc.no_stdin = 1;
2026 proc.stdout_to_stderr = 1;
2027 proc.err = use_sideband ? -1 : 0;
2028 proc.git_cmd = 1;
2029 proc.argv = argv_gc_auto;
2030 close_all_packs(the_repository->objects);
2032 if (!start_command(&proc)) {
2033 if (use_sideband)
2034 copy_to_sideband(proc.err, -1, NULL);
2035 finish_command(&proc);
2036 }
2037 }
2038 if (auto_update_server_info)
2039 update_server_info(0);
2040 clear_shallow_info(&si);
2041 }
2042 if (use_sideband)
2043 packet_flush(1);
2044 oid_array_clear(&shallow);
2045 oid_array_clear(&ref);
2046 free((void *)push_cert_nonce);
2047 return 0;
2048}