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doc: add document for capability report-status-v2
[alt-git.git] / builtin / receive-pack.c
blobd6a216b2e3a6b82c7fa4d8948558104122ebda4a
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 "string-list.h"
16 #include "oid-array.h"
17 #include "connected.h"
18 #include "argv-array.h"
19 #include "version.h"
20 #include "tag.h"
21 #include "gpg-interface.h"
22 #include "sigchain.h"
23 #include "fsck.h"
24 #include "tmp-objdir.h"
25 #include "oidset.h"
26 #include "packfile.h"
27 #include "object-store.h"
28 #include "protocol.h"
29 #include "commit-reach.h"
30 #include "worktree.h"
31
32 static const char * const receive_pack_usage[] = {
33 N_("git receive-pack <git-dir>"),
34 NULL
35 };
36
37 enum deny_action {
38 DENY_UNCONFIGURED,
39 DENY_IGNORE,
40 DENY_WARN,
41 DENY_REFUSE,
42 DENY_UPDATE_INSTEAD
43 };
44
45 static int deny_deletes;
46 static int deny_non_fast_forwards;
47 static enum deny_action deny_current_branch = DENY_UNCONFIGURED;
48 static enum deny_action deny_delete_current = DENY_UNCONFIGURED;
49 static int receive_fsck_objects = -1;
50 static int transfer_fsck_objects = -1;
51 static struct strbuf fsck_msg_types = STRBUF_INIT;
52 static int receive_unpack_limit = -1;
53 static int transfer_unpack_limit = -1;
54 static int advertise_atomic_push = 1;
55 static int advertise_push_options;
56 static int unpack_limit = 100;
57 static off_t max_input_size;
58 static int report_status;
59 static int report_status_v2;
60 static int use_sideband;
61 static int use_atomic;
62 static int use_push_options;
63 static int quiet;
64 static int prefer_ofs_delta = 1;
65 static int auto_update_server_info;
66 static int auto_gc = 1;
67 static int reject_thin;
68 static int stateless_rpc;
69 static const char *service_dir;
70 static const char *head_name;
71 static void *head_name_to_free;
72 static int sent_capabilities;
73 static int shallow_update;
74 static const char *alt_shallow_file;
75 static struct strbuf push_cert = STRBUF_INIT;
76 static struct object_id push_cert_oid;
77 static struct signature_check sigcheck;
78 static const char *push_cert_nonce;
79 static const char *cert_nonce_seed;
80
81 static const char *NONCE_UNSOLICITED = "UNSOLICITED";
82 static const char *NONCE_BAD = "BAD";
83 static const char *NONCE_MISSING = "MISSING";
84 static const char *NONCE_OK = "OK";
85 static const char *NONCE_SLOP = "SLOP";
86 static const char *nonce_status;
87 static long nonce_stamp_slop;
88 static timestamp_t nonce_stamp_slop_limit;
89 static struct ref_transaction *transaction;
90
91 static enum {
92 KEEPALIVE_NEVER = 0,
93 KEEPALIVE_AFTER_NUL,
94 KEEPALIVE_ALWAYS
95 } use_keepalive;
96 static int keepalive_in_sec = 5;
97
98 static struct tmp_objdir *tmp_objdir;
99
100 static enum deny_action parse_deny_action(const char *var, const char *value)
101 {
102 if (value) {
103 if (!strcasecmp(value, "ignore"))
104 return DENY_IGNORE;
105 if (!strcasecmp(value, "warn"))
106 return DENY_WARN;
107 if (!strcasecmp(value, "refuse"))
108 return DENY_REFUSE;
109 if (!strcasecmp(value, "updateinstead"))
110 return DENY_UPDATE_INSTEAD;
111 }
112 if (git_config_bool(var, value))
113 return DENY_REFUSE;
114 return DENY_IGNORE;
115 }
116
117 static int receive_pack_config(const char *var, const char *value, void *cb)
118 {
119 int status = parse_hide_refs_config(var, value, "receive");
120
121 if (status)
122 return status;
123
124 if (strcmp(var, "receive.denydeletes") == 0) {
125 deny_deletes = git_config_bool(var, value);
126 return 0;
127 }
128
129 if (strcmp(var, "receive.denynonfastforwards") == 0) {
130 deny_non_fast_forwards = git_config_bool(var, value);
131 return 0;
132 }
133
134 if (strcmp(var, "receive.unpacklimit") == 0) {
135 receive_unpack_limit = git_config_int(var, value);
136 return 0;
137 }
138
139 if (strcmp(var, "transfer.unpacklimit") == 0) {
140 transfer_unpack_limit = git_config_int(var, value);
141 return 0;
142 }
143
144 if (strcmp(var, "receive.fsck.skiplist") == 0) {
145 const char *path;
146
147 if (git_config_pathname(&path, var, value))
148 return 1;
149 strbuf_addf(&fsck_msg_types, "%cskiplist=%s",
150 fsck_msg_types.len ? ',' : '=', path);
151 free((char *)path);
152 return 0;
153 }
154
155 if (skip_prefix(var, "receive.fsck.", &var)) {
156 if (is_valid_msg_type(var, value))
157 strbuf_addf(&fsck_msg_types, "%c%s=%s",
158 fsck_msg_types.len ? ',' : '=', var, value);
159 else
160 warning("Skipping unknown msg id '%s'", var);
161 return 0;
162 }
163
164 if (strcmp(var, "receive.fsckobjects") == 0) {
165 receive_fsck_objects = git_config_bool(var, value);
166 return 0;
167 }
168
169 if (strcmp(var, "transfer.fsckobjects") == 0) {
170 transfer_fsck_objects = git_config_bool(var, value);
171 return 0;
172 }
173
174 if (!strcmp(var, "receive.denycurrentbranch")) {
175 deny_current_branch = parse_deny_action(var, value);
176 return 0;
177 }
178
179 if (strcmp(var, "receive.denydeletecurrent") == 0) {
180 deny_delete_current = parse_deny_action(var, value);
181 return 0;
182 }
183
184 if (strcmp(var, "repack.usedeltabaseoffset") == 0) {
185 prefer_ofs_delta = git_config_bool(var, value);
186 return 0;
187 }
188
189 if (strcmp(var, "receive.updateserverinfo") == 0) {
190 auto_update_server_info = git_config_bool(var, value);
191 return 0;
192 }
193
194 if (strcmp(var, "receive.autogc") == 0) {
195 auto_gc = git_config_bool(var, value);
196 return 0;
197 }
198
199 if (strcmp(var, "receive.shallowupdate") == 0) {
200 shallow_update = git_config_bool(var, value);
201 return 0;
202 }
203
204 if (strcmp(var, "receive.certnonceseed") == 0)
205 return git_config_string(&cert_nonce_seed, var, value);
206
207 if (strcmp(var, "receive.certnonceslop") == 0) {
208 nonce_stamp_slop_limit = git_config_ulong(var, value);
209 return 0;
210 }
211
212 if (strcmp(var, "receive.advertiseatomic") == 0) {
213 advertise_atomic_push = git_config_bool(var, value);
214 return 0;
215 }
216
217 if (strcmp(var, "receive.advertisepushoptions") == 0) {
218 advertise_push_options = git_config_bool(var, value);
219 return 0;
220 }
221
222 if (strcmp(var, "receive.keepalive") == 0) {
223 keepalive_in_sec = git_config_int(var, value);
224 return 0;
225 }
226
227 if (strcmp(var, "receive.maxinputsize") == 0) {
228 max_input_size = git_config_int64(var, value);
229 return 0;
230 }
231
232 return git_default_config(var, value, cb);
233 }
234
235 static void show_ref(const char *path, const struct object_id *oid)
236 {
237 if (sent_capabilities) {
238 packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), path);
239 } else {
240 struct strbuf cap = STRBUF_INIT;
241
242 strbuf_addstr(&cap,
243 "report-status report-status-v2 delete-refs side-band-64k quiet");
244 if (advertise_atomic_push)
245 strbuf_addstr(&cap, " atomic");
246 if (prefer_ofs_delta)
247 strbuf_addstr(&cap, " ofs-delta");
248 if (push_cert_nonce)
249 strbuf_addf(&cap, " push-cert=%s", push_cert_nonce);
250 if (advertise_push_options)
251 strbuf_addstr(&cap, " push-options");
252 strbuf_addf(&cap, " agent=%s", git_user_agent_sanitized());
253 packet_write_fmt(1, "%s %s%c%s\n",
254 oid_to_hex(oid), path, 0, cap.buf);
255 strbuf_release(&cap);
256 sent_capabilities = 1;
257 }
258 }
259
260 static int show_ref_cb(const char *path_full, const struct object_id *oid,
261 int flag, void *data)
262 {
263 struct oidset *seen = data;
264 const char *path = strip_namespace(path_full);
265
266 if (ref_is_hidden(path, path_full))
267 return 0;
268
269 /*
270 * Advertise refs outside our current namespace as ".have"
271 * refs, so that the client can use them to minimize data
272 * transfer but will otherwise ignore them.
273 */
274 if (!path) {
275 if (oidset_insert(seen, oid))
276 return 0;
277 path = ".have";
278 } else {
279 oidset_insert(seen, oid);
280 }
281 show_ref(path, oid);
282 return 0;
283 }
284
285 static void show_one_alternate_ref(const struct object_id *oid,
286 void *data)
287 {
288 struct oidset *seen = data;
289
290 if (oidset_insert(seen, oid))
291 return;
292
293 show_ref(".have", oid);
294 }
295
296 static void write_head_info(void)
297 {
298 static struct oidset seen = OIDSET_INIT;
299
300 for_each_ref(show_ref_cb, &seen);
301 for_each_alternate_ref(show_one_alternate_ref, &seen);
302 oidset_clear(&seen);
303 if (!sent_capabilities)
304 show_ref("capabilities^{}", &null_oid);
305
306 advertise_shallow_grafts(1);
307
308 /* EOF */
309 packet_flush(1);
310 }
311
312 #define RUN_PROC_RECEIVE_SCHEDULED 1
313 #define RUN_PROC_RECEIVE_RETURNED 2
314 struct command {
315 struct command *next;
316 const char *error_string;
317 struct ref_push_report *report;
318 unsigned int skip_update:1,
319 did_not_exist:1,
320 run_proc_receive:2;
321 int index;
322 struct object_id old_oid;
323 struct object_id new_oid;
324 char ref_name[FLEX_ARRAY]; /* more */
325 };
326
327 static void rp_error(const char *err, ...) __attribute__((format (printf, 1, 2)));
328 static void rp_warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
329
330 static void report_message(const char *prefix, const char *err, va_list params)
331 {
332 int sz;
333 char msg[4096];
334
335 sz = xsnprintf(msg, sizeof(msg), "%s", prefix);
336 sz += vsnprintf(msg + sz, sizeof(msg) - sz, err, params);
337 if (sz > (sizeof(msg) - 1))
338 sz = sizeof(msg) - 1;
339 msg[sz++] = '\n';
340
341 if (use_sideband)
342 send_sideband(1, 2, msg, sz, use_sideband);
343 else
344 xwrite(2, msg, sz);
345 }
346
347 static void rp_warning(const char *err, ...)
348 {
349 va_list params;
350 va_start(params, err);
351 report_message("warning: ", err, params);
352 va_end(params);
353 }
354
355 static void rp_error(const char *err, ...)
356 {
357 va_list params;
358 va_start(params, err);
359 report_message("error: ", err, params);
360 va_end(params);
361 }
362
363 static int copy_to_sideband(int in, int out, void *arg)
364 {
365 char data[128];
366 int keepalive_active = 0;
367
368 if (keepalive_in_sec <= 0)
369 use_keepalive = KEEPALIVE_NEVER;
370 if (use_keepalive == KEEPALIVE_ALWAYS)
371 keepalive_active = 1;
372
373 while (1) {
374 ssize_t sz;
375
376 if (keepalive_active) {
377 struct pollfd pfd;
378 int ret;
379
380 pfd.fd = in;
381 pfd.events = POLLIN;
382 ret = poll(&pfd, 1, 1000 * keepalive_in_sec);
383
384 if (ret < 0) {
385 if (errno == EINTR)
386 continue;
387 else
388 break;
389 } else if (ret == 0) {
390 /* no data; send a keepalive packet */
391 static const char buf[] = "0005\1";
392 write_or_die(1, buf, sizeof(buf) - 1);
393 continue;
394 } /* else there is actual data to read */
395 }
396
397 sz = xread(in, data, sizeof(data));
398 if (sz <= 0)
399 break;
400
401 if (use_keepalive == KEEPALIVE_AFTER_NUL && !keepalive_active) {
402 const char *p = memchr(data, '\0', sz);
403 if (p) {
404 /*
405 * The NUL tells us to start sending keepalives. Make
406 * sure we send any other data we read along
407 * with it.
408 */
409 keepalive_active = 1;
410 send_sideband(1, 2, data, p - data, use_sideband);
411 send_sideband(1, 2, p + 1, sz - (p - data + 1), use_sideband);
412 continue;
413 }
414 }
415
416 /*
417 * Either we're not looking for a NUL signal, or we didn't see
418 * it yet; just pass along the data.
419 */
420 send_sideband(1, 2, data, sz, use_sideband);
421 }
422 close(in);
423 return 0;
424 }
425
426 static void hmac(unsigned char *out,
427 const char *key_in, size_t key_len,
428 const char *text, size_t text_len)
429 {
430 unsigned char key[GIT_MAX_BLKSZ];
431 unsigned char k_ipad[GIT_MAX_BLKSZ];
432 unsigned char k_opad[GIT_MAX_BLKSZ];
433 int i;
434 git_hash_ctx ctx;
435
436 /* RFC 2104 2. (1) */
437 memset(key, '\0', GIT_MAX_BLKSZ);
438 if (the_hash_algo->blksz < key_len) {
439 the_hash_algo->init_fn(&ctx);
440 the_hash_algo->update_fn(&ctx, key_in, key_len);
441 the_hash_algo->final_fn(key, &ctx);
442 } else {
443 memcpy(key, key_in, key_len);
444 }
445
446 /* RFC 2104 2. (2) & (5) */
447 for (i = 0; i < sizeof(key); i++) {
448 k_ipad[i] = key[i] ^ 0x36;
449 k_opad[i] = key[i] ^ 0x5c;
450 }
451
452 /* RFC 2104 2. (3) & (4) */
453 the_hash_algo->init_fn(&ctx);
454 the_hash_algo->update_fn(&ctx, k_ipad, sizeof(k_ipad));
455 the_hash_algo->update_fn(&ctx, text, text_len);
456 the_hash_algo->final_fn(out, &ctx);
457
458 /* RFC 2104 2. (6) & (7) */
459 the_hash_algo->init_fn(&ctx);
460 the_hash_algo->update_fn(&ctx, k_opad, sizeof(k_opad));
461 the_hash_algo->update_fn(&ctx, out, the_hash_algo->rawsz);
462 the_hash_algo->final_fn(out, &ctx);
463 }
464
465 static char *prepare_push_cert_nonce(const char *path, timestamp_t stamp)
466 {
467 struct strbuf buf = STRBUF_INIT;
468 unsigned char hash[GIT_MAX_RAWSZ];
469
470 strbuf_addf(&buf, "%s:%"PRItime, path, stamp);
471 hmac(hash, buf.buf, buf.len, cert_nonce_seed, strlen(cert_nonce_seed));
472 strbuf_release(&buf);
473
474 /* RFC 2104 5. HMAC-SHA1-80 */
475 strbuf_addf(&buf, "%"PRItime"-%.*s", stamp, (int)the_hash_algo->hexsz, hash_to_hex(hash));
476 return strbuf_detach(&buf, NULL);
477 }
478
479 /*
480 * NEEDSWORK: reuse find_commit_header() from jk/commit-author-parsing
481 * after dropping "_commit" from its name and possibly moving it out
482 * of commit.c
483 */
484 static char *find_header(const char *msg, size_t len, const char *key,
485 const char **next_line)
486 {
487 int key_len = strlen(key);
488 const char *line = msg;
489
490 while (line && line < msg + len) {
491 const char *eol = strchrnul(line, '\n');
492
493 if ((msg + len <= eol) || line == eol)
494 return NULL;
495 if (line + key_len < eol &&
496 !memcmp(line, key, key_len) && line[key_len] == ' ') {
497 int offset = key_len + 1;
498 if (next_line)
499 *next_line = *eol ? eol + 1 : eol;
500 return xmemdupz(line + offset, (eol - line) - offset);
501 }
502 line = *eol ? eol + 1 : NULL;
503 }
504 return NULL;
505 }
506
507 /*
508 * Return zero if a and b are equal up to n bytes and nonzero if they are not.
509 * This operation is guaranteed to run in constant time to avoid leaking data.
510 */
511 static int constant_memequal(const char *a, const char *b, size_t n)
512 {
513 int res = 0;
514 size_t i;
515
516 for (i = 0; i < n; i++)
517 res |= a[i] ^ b[i];
518 return res;
519 }
520
521 static const char *check_nonce(const char *buf, size_t len)
522 {
523 char *nonce = find_header(buf, len, "nonce", NULL);
524 timestamp_t stamp, ostamp;
525 char *bohmac, *expect = NULL;
526 const char *retval = NONCE_BAD;
527 size_t noncelen;
528
529 if (!nonce) {
530 retval = NONCE_MISSING;
531 goto leave;
532 } else if (!push_cert_nonce) {
533 retval = NONCE_UNSOLICITED;
534 goto leave;
535 } else if (!strcmp(push_cert_nonce, nonce)) {
536 retval = NONCE_OK;
537 goto leave;
538 }
539
540 if (!stateless_rpc) {
541 /* returned nonce MUST match what we gave out earlier */
542 retval = NONCE_BAD;
543 goto leave;
544 }
545
546 /*
547 * In stateless mode, we may be receiving a nonce issued by
548 * another instance of the server that serving the same
549 * repository, and the timestamps may not match, but the
550 * nonce-seed and dir should match, so we can recompute and
551 * report the time slop.
552 *
553 * In addition, when a nonce issued by another instance has
554 * timestamp within receive.certnonceslop seconds, we pretend
555 * as if we issued that nonce when reporting to the hook.
556 */
557
558 /* nonce is concat(<seconds-since-epoch>, "-", <hmac>) */
559 if (*nonce <= '0' || '9' < *nonce) {
560 retval = NONCE_BAD;
561 goto leave;
562 }
563 stamp = parse_timestamp(nonce, &bohmac, 10);
564 if (bohmac == nonce || bohmac[0] != '-') {
565 retval = NONCE_BAD;
566 goto leave;
567 }
568
569 noncelen = strlen(nonce);
570 expect = prepare_push_cert_nonce(service_dir, stamp);
571 if (noncelen != strlen(expect)) {
572 /* This is not even the right size. */
573 retval = NONCE_BAD;
574 goto leave;
575 }
576 if (constant_memequal(expect, nonce, noncelen)) {
577 /* Not what we would have signed earlier */
578 retval = NONCE_BAD;
579 goto leave;
580 }
581
582 /*
583 * By how many seconds is this nonce stale? Negative value
584 * would mean it was issued by another server with its clock
585 * skewed in the future.
586 */
587 ostamp = parse_timestamp(push_cert_nonce, NULL, 10);
588 nonce_stamp_slop = (long)ostamp - (long)stamp;
589
590 if (nonce_stamp_slop_limit &&
591 labs(nonce_stamp_slop) <= nonce_stamp_slop_limit) {
592 /*
593 * Pretend as if the received nonce (which passes the
594 * HMAC check, so it is not a forged by third-party)
595 * is what we issued.
596 */
597 free((void *)push_cert_nonce);
598 push_cert_nonce = xstrdup(nonce);
599 retval = NONCE_OK;
600 } else {
601 retval = NONCE_SLOP;
602 }
603
604 leave:
605 free(nonce);
606 free(expect);
607 return retval;
608 }
609
610 /*
611 * Return 1 if there is no push_cert or if the push options in push_cert are
612 * the same as those in the argument; 0 otherwise.
613 */
614 static int check_cert_push_options(const struct string_list *push_options)
615 {
616 const char *buf = push_cert.buf;
617 int len = push_cert.len;
618
619 char *option;
620 const char *next_line;
621 int options_seen = 0;
622
623 int retval = 1;
624
625 if (!len)
626 return 1;
627
628 while ((option = find_header(buf, len, "push-option", &next_line))) {
629 len -= (next_line - buf);
630 buf = next_line;
631 options_seen++;
632 if (options_seen > push_options->nr
633 || strcmp(option,
634 push_options->items[options_seen - 1].string)) {
635 retval = 0;
636 goto leave;
637 }
638 free(option);
639 }
640
641 if (options_seen != push_options->nr)
642 retval = 0;
643
644 leave:
645 free(option);
646 return retval;
647 }
648
649 static void prepare_push_cert_sha1(struct child_process *proc)
650 {
651 static int already_done;
652
653 if (!push_cert.len)
654 return;
655
656 if (!already_done) {
657 int bogs /* beginning_of_gpg_sig */;
658
659 already_done = 1;
660 if (write_object_file(push_cert.buf, push_cert.len, "blob",
661 &push_cert_oid))
662 oidclr(&push_cert_oid);
663
664 memset(&sigcheck, '\0', sizeof(sigcheck));
665
666 bogs = parse_signature(push_cert.buf, push_cert.len);
667 check_signature(push_cert.buf, bogs, push_cert.buf + bogs,
668 push_cert.len - bogs, &sigcheck);
669
670 nonce_status = check_nonce(push_cert.buf, bogs);
671 }
672 if (!is_null_oid(&push_cert_oid)) {
673 argv_array_pushf(&proc->env_array, "GIT_PUSH_CERT=%s",
674 oid_to_hex(&push_cert_oid));
675 argv_array_pushf(&proc->env_array, "GIT_PUSH_CERT_SIGNER=%s",
676 sigcheck.signer ? sigcheck.signer : "");
677 argv_array_pushf(&proc->env_array, "GIT_PUSH_CERT_KEY=%s",
678 sigcheck.key ? sigcheck.key : "");
679 argv_array_pushf(&proc->env_array, "GIT_PUSH_CERT_STATUS=%c",
680 sigcheck.result);
681 if (push_cert_nonce) {
682 argv_array_pushf(&proc->env_array,
683 "GIT_PUSH_CERT_NONCE=%s",
684 push_cert_nonce);
685 argv_array_pushf(&proc->env_array,
686 "GIT_PUSH_CERT_NONCE_STATUS=%s",
687 nonce_status);
688 if (nonce_status == NONCE_SLOP)
689 argv_array_pushf(&proc->env_array,
690 "GIT_PUSH_CERT_NONCE_SLOP=%ld",
691 nonce_stamp_slop);
692 }
693 }
694 }
695
696 struct receive_hook_feed_state {
697 struct command *cmd;
698 struct ref_push_report *report;
699 int skip_broken;
700 struct strbuf buf;
701 const struct string_list *push_options;
702 };
703
704 typedef int (*feed_fn)(void *, const char **, size_t *);
705 static int run_and_feed_hook(const char *hook_name, feed_fn feed,
706 struct receive_hook_feed_state *feed_state)
707 {
708 struct child_process proc = CHILD_PROCESS_INIT;
709 struct async muxer;
710 const char *argv[2];
711 int code;
712
713 argv[0] = find_hook(hook_name);
714 if (!argv[0])
715 return 0;
716
717 argv[1] = NULL;
718
719 proc.argv = argv;
720 proc.in = -1;
721 proc.stdout_to_stderr = 1;
722 proc.trace2_hook_name = hook_name;
723
724 if (feed_state->push_options) {
725 int i;
726 for (i = 0; i < feed_state->push_options->nr; i++)
727 argv_array_pushf(&proc.env_array,
728 "GIT_PUSH_OPTION_%d=%s", i,
729 feed_state->push_options->items[i].string);
730 argv_array_pushf(&proc.env_array, "GIT_PUSH_OPTION_COUNT=%d",
731 feed_state->push_options->nr);
732 } else
733 argv_array_pushf(&proc.env_array, "GIT_PUSH_OPTION_COUNT");
734
735 if (tmp_objdir)
736 argv_array_pushv(&proc.env_array, tmp_objdir_env(tmp_objdir));
737
738 if (use_sideband) {
739 memset(&muxer, 0, sizeof(muxer));
740 muxer.proc = copy_to_sideband;
741 muxer.in = -1;
742 code = start_async(&muxer);
743 if (code)
744 return code;
745 proc.err = muxer.in;
746 }
747
748 prepare_push_cert_sha1(&proc);
749
750 code = start_command(&proc);
751 if (code) {
752 if (use_sideband)
753 finish_async(&muxer);
754 return code;
755 }
756
757 sigchain_push(SIGPIPE, SIG_IGN);
758
759 while (1) {
760 const char *buf;
761 size_t n;
762 if (feed(feed_state, &buf, &n))
763 break;
764 if (write_in_full(proc.in, buf, n) < 0)
765 break;
766 }
767 close(proc.in);
768 if (use_sideband)
769 finish_async(&muxer);
770
771 sigchain_pop(SIGPIPE);
772
773 return finish_command(&proc);
774 }
775
776 static int feed_receive_hook(void *state_, const char **bufp, size_t *sizep)
777 {
778 struct receive_hook_feed_state *state = state_;
779 struct command *cmd = state->cmd;
780
781 while (cmd &&
782 state->skip_broken && (cmd->error_string || cmd->did_not_exist))
783 cmd = cmd->next;
784 if (!cmd)
785 return -1; /* EOF */
786 if (!bufp)
787 return 0; /* OK, can feed something. */
788 strbuf_reset(&state->buf);
789 if (!state->report)
790 state->report = cmd->report;
791 if (state->report) {
792 struct object_id *old_oid;
793 struct object_id *new_oid;
794 const char *ref_name;
795
796 old_oid = state->report->old_oid ? state->report->old_oid : &cmd->old_oid;
797 new_oid = state->report->new_oid ? state->report->new_oid : &cmd->new_oid;
798 ref_name = state->report->ref_name ? state->report->ref_name : cmd->ref_name;
799 strbuf_addf(&state->buf, "%s %s %s\n",
800 oid_to_hex(old_oid), oid_to_hex(new_oid),
801 ref_name);
802 state->report = state->report->next;
803 if (!state->report)
804 state->cmd = cmd->next;
805 } else {
806 strbuf_addf(&state->buf, "%s %s %s\n",
807 oid_to_hex(&cmd->old_oid), oid_to_hex(&cmd->new_oid),
808 cmd->ref_name);
809 state->cmd = cmd->next;
810 }
811 if (bufp) {
812 *bufp = state->buf.buf;
813 *sizep = state->buf.len;
814 }
815 return 0;
816 }
817
818 static int run_receive_hook(struct command *commands,
819 const char *hook_name,
820 int skip_broken,
821 const struct string_list *push_options)
822 {
823 struct receive_hook_feed_state state;
824 int status;
825
826 strbuf_init(&state.buf, 0);
827 state.cmd = commands;
828 state.skip_broken = skip_broken;
829 state.report = NULL;
830 if (feed_receive_hook(&state, NULL, NULL))
831 return 0;
832 state.cmd = commands;
833 state.push_options = push_options;
834 status = run_and_feed_hook(hook_name, feed_receive_hook, &state);
835 strbuf_release(&state.buf);
836 return status;
837 }
838
839 static int run_update_hook(struct command *cmd)
840 {
841 const char *argv[5];
842 struct child_process proc = CHILD_PROCESS_INIT;
843 int code;
844
845 argv[0] = find_hook("update");
846 if (!argv[0])
847 return 0;
848
849 argv[1] = cmd->ref_name;
850 argv[2] = oid_to_hex(&cmd->old_oid);
851 argv[3] = oid_to_hex(&cmd->new_oid);
852 argv[4] = NULL;
853
854 proc.no_stdin = 1;
855 proc.stdout_to_stderr = 1;
856 proc.err = use_sideband ? -1 : 0;
857 proc.argv = argv;
858 proc.trace2_hook_name = "update";
859
860 code = start_command(&proc);
861 if (code)
862 return code;
863 if (use_sideband)
864 copy_to_sideband(proc.err, -1, NULL);
865 return finish_command(&proc);
866 }
867
868 static struct command *find_command_by_refname(struct command *list,
869 const char *refname)
870 {
871 for (; list; list = list->next)
872 if (!strcmp(list->ref_name, refname))
873 return list;
874 return NULL;
875 }
876
877 static int read_proc_receive_report(struct packet_reader *reader,
878 struct command *commands,
879 struct strbuf *errmsg)
880 {
881 struct command *cmd;
882 struct command *hint = NULL;
883 struct ref_push_report *report = NULL;
884 int new_report = 0;
885 int code = 0;
886 int once = 0;
887
888 for (;;) {
889 struct object_id old_oid, new_oid;
890 const char *head;
891 const char *refname;
892 char *p;
893
894 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
895 break;
896
897 head = reader->line;
898 p = strchr(head, ' ');
899 if (!p) {
900 strbuf_addf(errmsg, "proc-receive reported incomplete status line: '%s'\n", head);
901 code = -1;
902 continue;
903 }
904 *p++ = '\0';
905 if (!strcmp(head, "option")) {
906 const char *key, *val;
907
908 if (!hint || !(report || new_report)) {
909 if (!once++)
910 strbuf_addstr(errmsg, "proc-receive reported 'option' without a matching 'ok/ng' directive\n");
911 code = -1;
912 continue;
913 }
914 if (new_report) {
915 if (!hint->report) {
916 hint->report = xcalloc(1, sizeof(struct ref_push_report));
917 report = hint->report;
918 } else {
919 report = hint->report;
920 while (report->next)
921 report = report->next;
922 report->next = xcalloc(1, sizeof(struct ref_push_report));
923 report = report->next;
924 }
925 new_report = 0;
926 }
927 key = p;
928 p = strchr(key, ' ');
929 if (p)
930 *p++ = '\0';
931 val = p;
932 if (!strcmp(key, "refname"))
933 report->ref_name = xstrdup_or_null(val);
934 else if (!strcmp(key, "old-oid") && val &&
935 !parse_oid_hex(val, &old_oid, &val))
936 report->old_oid = oiddup(&old_oid);
937 else if (!strcmp(key, "new-oid") && val &&
938 !parse_oid_hex(val, &new_oid, &val))
939 report->new_oid = oiddup(&new_oid);
940 else if (!strcmp(key, "forced-update"))
941 report->forced_update = 1;
942 else if (!strcmp(key, "fall-through"))
943 /* Fall through, let 'receive-pack' to execute it. */
944 hint->run_proc_receive = 0;
945 continue;
946 }
947
948 report = NULL;
949 new_report = 0;
950 refname = p;
951 p = strchr(refname, ' ');
952 if (p)
953 *p++ = '\0';
954 if (strcmp(head, "ok") && strcmp(head, "ng")) {
955 strbuf_addf(errmsg, "proc-receive reported bad status '%s' on ref '%s'\n",
956 head, refname);
957 code = -1;
958 continue;
959 }
960
961 /* first try searching at our hint, falling back to all refs */
962 if (hint)
963 hint = find_command_by_refname(hint, refname);
964 if (!hint)
965 hint = find_command_by_refname(commands, refname);
966 if (!hint) {
967 strbuf_addf(errmsg, "proc-receive reported status on unknown ref: %s\n",
968 refname);
969 code = -1;
970 continue;
971 }
972 if (!hint->run_proc_receive) {
973 strbuf_addf(errmsg, "proc-receive reported status on unexpected ref: %s\n",
974 refname);
975 code = -1;
976 continue;
977 }
978 hint->run_proc_receive |= RUN_PROC_RECEIVE_RETURNED;
979 if (!strcmp(head, "ng")) {
980 if (p)
981 hint->error_string = xstrdup(p);
982 else
983 hint->error_string = "failed";
984 code = -1;
985 continue;
986 }
987 new_report = 1;
988 }
989
990 for (cmd = commands; cmd; cmd = cmd->next)
991 if (cmd->run_proc_receive && !cmd->error_string &&
992 !(cmd->run_proc_receive & RUN_PROC_RECEIVE_RETURNED)) {
993 cmd->error_string = "proc-receive failed to report status";
994 code = -1;
995 }
996 return code;
997 }
998
999 static int run_proc_receive_hook(struct command *commands,
1000 const struct string_list *push_options)
1001 {
1002 struct child_process proc = CHILD_PROCESS_INIT;
1003 struct async muxer;
1004 struct command *cmd;
1005 const char *argv[2];
1006 struct packet_reader reader;
1007 struct strbuf cap = STRBUF_INIT;
1008 struct strbuf errmsg = STRBUF_INIT;
1009 int hook_use_push_options = 0;
1010 int version = 0;
1011 int code;
1012
1013 argv[0] = find_hook("proc-receive");
1014 if (!argv[0]) {
1015 rp_error("cannot find hook 'proc-receive'");
1016 return -1;
1017 }
1018 argv[1] = NULL;
1019
1020 proc.argv = argv;
1021 proc.in = -1;
1022 proc.out = -1;
1023 proc.trace2_hook_name = "proc-receive";
1024
1025 if (use_sideband) {
1026 memset(&muxer, 0, sizeof(muxer));
1027 muxer.proc = copy_to_sideband;
1028 muxer.in = -1;
1029 code = start_async(&muxer);
1030 if (code)
1031 return code;
1032 proc.err = muxer.in;
1033 } else {
1034 proc.err = 0;
1035 }
1036
1037 code = start_command(&proc);
1038 if (code) {
1039 if (use_sideband)
1040 finish_async(&muxer);
1041 return code;
1042 }
1043
1044 sigchain_push(SIGPIPE, SIG_IGN);
1045
1046 /* Version negotiaton */
1047 packet_reader_init(&reader, proc.out, NULL, 0,
1048 PACKET_READ_CHOMP_NEWLINE |
1049 PACKET_READ_GENTLE_ON_EOF);
1050 if (use_atomic)
1051 strbuf_addstr(&cap, " atomic");
1052 if (use_push_options)
1053 strbuf_addstr(&cap, " push-options");
1054 if (cap.len) {
1055 packet_write_fmt(proc.in, "version=1%c%s\n", '\0', cap.buf + 1);
1056 strbuf_release(&cap);
1057 } else {
1058 packet_write_fmt(proc.in, "version=1\n");
1059 }
1060 packet_flush(proc.in);
1061
1062 for (;;) {
1063 int linelen;
1064
1065 if (packet_reader_read(&reader) != PACKET_READ_NORMAL)
1066 break;
1067
1068 if (reader.pktlen > 8 && starts_with(reader.line, "version=")) {
1069 version = atoi(reader.line + 8);
1070 linelen = strlen(reader.line);
1071 if (linelen < reader.pktlen) {
1072 const char *feature_list = reader.line + linelen + 1;
1073 if (parse_feature_request(feature_list, "push-options"))
1074 hook_use_push_options = 1;
1075 }
1076 }
1077 }
1078
1079 if (version != 1) {
1080 strbuf_addf(&errmsg, "proc-receive version '%d' is not supported",
1081 version);
1082 code = -1;
1083 goto cleanup;
1084 }
1085
1086 /* Send commands */
1087 for (cmd = commands; cmd; cmd = cmd->next) {
1088 if (!cmd->run_proc_receive || cmd->skip_update || cmd->error_string)
1089 continue;
1090 packet_write_fmt(proc.in, "%s %s %s",
1091 oid_to_hex(&cmd->old_oid),
1092 oid_to_hex(&cmd->new_oid),
1093 cmd->ref_name);
1094 }
1095 packet_flush(proc.in);
1096
1097 /* Send push options */
1098 if (hook_use_push_options) {
1099 struct string_list_item *item;
1100
1101 for_each_string_list_item(item, push_options)
1102 packet_write_fmt(proc.in, "%s", item->string);
1103 packet_flush(proc.in);
1104 }
1105
1106 /* Read result from proc-receive */
1107 code = read_proc_receive_report(&reader, commands, &errmsg);
1108
1109 cleanup:
1110 close(proc.in);
1111 close(proc.out);
1112 if (use_sideband)
1113 finish_async(&muxer);
1114 if (finish_command(&proc))
1115 code = -1;
1116 if (errmsg.len >0) {
1117 char *p = errmsg.buf;
1118
1119 p += errmsg.len - 1;
1120 if (*p == '\n')
1121 *p = '\0';
1122 rp_error("%s", errmsg.buf);
1123 strbuf_release(&errmsg);
1124 }
1125 sigchain_pop(SIGPIPE);
1126
1127 return code;
1128 }
1129
1130 static char *refuse_unconfigured_deny_msg =
1131 N_("By default, updating the current branch in a non-bare repository\n"
1132 "is denied, because it will make the index and work tree inconsistent\n"
1133 "with what you pushed, and will require 'git reset --hard' to match\n"
1134 "the work tree to HEAD.\n"
1135 "\n"
1136 "You can set the 'receive.denyCurrentBranch' configuration variable\n"
1137 "to 'ignore' or 'warn' in the remote repository to allow pushing into\n"
1138 "its current branch; however, this is not recommended unless you\n"
1139 "arranged to update its work tree to match what you pushed in some\n"
1140 "other way.\n"
1141 "\n"
1142 "To squelch this message and still keep the default behaviour, set\n"
1143 "'receive.denyCurrentBranch' configuration variable to 'refuse'.");
1144
1145 static void refuse_unconfigured_deny(void)
1146 {
1147 rp_error("%s", _(refuse_unconfigured_deny_msg));
1148 }
1149
1150 static char *refuse_unconfigured_deny_delete_current_msg =
1151 N_("By default, deleting the current branch is denied, because the next\n"
1152 "'git clone' won't result in any file checked out, causing confusion.\n"
1153 "\n"
1154 "You can set 'receive.denyDeleteCurrent' configuration variable to\n"
1155 "'warn' or 'ignore' in the remote repository to allow deleting the\n"
1156 "current branch, with or without a warning message.\n"
1157 "\n"
1158 "To squelch this message, you can set it to 'refuse'.");
1159
1160 static void refuse_unconfigured_deny_delete_current(void)
1161 {
1162 rp_error("%s", _(refuse_unconfigured_deny_delete_current_msg));
1163 }
1164
1165 static int command_singleton_iterator(void *cb_data, struct object_id *oid);
1166 static int update_shallow_ref(struct command *cmd, struct shallow_info *si)
1167 {
1168 struct lock_file shallow_lock = LOCK_INIT;
1169 struct oid_array extra = OID_ARRAY_INIT;
1170 struct check_connected_options opt = CHECK_CONNECTED_INIT;
1171 uint32_t mask = 1 << (cmd->index % 32);
1172 int i;
1173
1174 trace_printf_key(&trace_shallow,
1175 "shallow: update_shallow_ref %s\n", cmd->ref_name);
1176 for (i = 0; i < si->shallow->nr; i++)
1177 if (si->used_shallow[i] &&
1178 (si->used_shallow[i][cmd->index / 32] & mask) &&
1179 !delayed_reachability_test(si, i))
1180 oid_array_append(&extra, &si->shallow->oid[i]);
1181
1182 opt.env = tmp_objdir_env(tmp_objdir);
1183 setup_alternate_shallow(&shallow_lock, &opt.shallow_file, &extra);
1184 if (check_connected(command_singleton_iterator, cmd, &opt)) {
1185 rollback_shallow_file(the_repository, &shallow_lock);
1186 oid_array_clear(&extra);
1187 return -1;
1188 }
1189
1190 commit_shallow_file(the_repository, &shallow_lock);
1191
1192 /*
1193 * Make sure setup_alternate_shallow() for the next ref does
1194 * not lose these new roots..
1195 */
1196 for (i = 0; i < extra.nr; i++)
1197 register_shallow(the_repository, &extra.oid[i]);
1198
1199 si->shallow_ref[cmd->index] = 0;
1200 oid_array_clear(&extra);
1201 return 0;
1202 }
1203
1204 /*
1205 * NEEDSWORK: we should consolidate various implementions of "are we
1206 * on an unborn branch?" test into one, and make the unified one more
1207 * robust. !get_sha1() based check used here and elsewhere would not
1208 * allow us to tell an unborn branch from corrupt ref, for example.
1209 * For the purpose of fixing "deploy-to-update does not work when
1210 * pushing into an empty repository" issue, this should suffice for
1211 * now.
1212 */
1213 static int head_has_history(void)
1214 {
1215 struct object_id oid;
1216
1217 return !get_oid("HEAD", &oid);
1218 }
1219
1220 static const char *push_to_deploy(unsigned char *sha1,
1221 struct argv_array *env,
1222 const char *work_tree)
1223 {
1224 const char *update_refresh[] = {
1225 "update-index", "-q", "--ignore-submodules", "--refresh", NULL
1226 };
1227 const char *diff_files[] = {
1228 "diff-files", "--quiet", "--ignore-submodules", "--", NULL
1229 };
1230 const char *diff_index[] = {
1231 "diff-index", "--quiet", "--cached", "--ignore-submodules",
1232 NULL, "--", NULL
1233 };
1234 const char *read_tree[] = {
1235 "read-tree", "-u", "-m", NULL, NULL
1236 };
1237 struct child_process child = CHILD_PROCESS_INIT;
1238
1239 child.argv = update_refresh;
1240 child.env = env->argv;
1241 child.dir = work_tree;
1242 child.no_stdin = 1;
1243 child.stdout_to_stderr = 1;
1244 child.git_cmd = 1;
1245 if (run_command(&child))
1246 return "Up-to-date check failed";
1247
1248 /* run_command() does not clean up completely; reinitialize */
1249 child_process_init(&child);
1250 child.argv = diff_files;
1251 child.env = env->argv;
1252 child.dir = work_tree;
1253 child.no_stdin = 1;
1254 child.stdout_to_stderr = 1;
1255 child.git_cmd = 1;
1256 if (run_command(&child))
1257 return "Working directory has unstaged changes";
1258
1259 /* diff-index with either HEAD or an empty tree */
1260 diff_index[4] = head_has_history() ? "HEAD" : empty_tree_oid_hex();
1261
1262 child_process_init(&child);
1263 child.argv = diff_index;
1264 child.env = env->argv;
1265 child.no_stdin = 1;
1266 child.no_stdout = 1;
1267 child.stdout_to_stderr = 0;
1268 child.git_cmd = 1;
1269 if (run_command(&child))
1270 return "Working directory has staged changes";
1271
1272 read_tree[3] = hash_to_hex(sha1);
1273 child_process_init(&child);
1274 child.argv = read_tree;
1275 child.env = env->argv;
1276 child.dir = work_tree;
1277 child.no_stdin = 1;
1278 child.no_stdout = 1;
1279 child.stdout_to_stderr = 0;
1280 child.git_cmd = 1;
1281 if (run_command(&child))
1282 return "Could not update working tree to new HEAD";
1283
1284 return NULL;
1285 }
1286
1287 static const char *push_to_checkout_hook = "push-to-checkout";
1288
1289 static const char *push_to_checkout(unsigned char *hash,
1290 struct argv_array *env,
1291 const char *work_tree)
1292 {
1293 argv_array_pushf(env, "GIT_WORK_TREE=%s", absolute_path(work_tree));
1294 if (run_hook_le(env->argv, push_to_checkout_hook,
1295 hash_to_hex(hash), NULL))
1296 return "push-to-checkout hook declined";
1297 else
1298 return NULL;
1299 }
1300
1301 static const char *update_worktree(unsigned char *sha1, const struct worktree *worktree)
1302 {
1303 const char *retval, *work_tree, *git_dir = NULL;
1304 struct argv_array env = ARGV_ARRAY_INIT;
1305
1306 if (worktree && worktree->path)
1307 work_tree = worktree->path;
1308 else if (git_work_tree_cfg)
1309 work_tree = git_work_tree_cfg;
1310 else
1311 work_tree = "..";
1312
1313 if (is_bare_repository())
1314 return "denyCurrentBranch = updateInstead needs a worktree";
1315 if (worktree)
1316 git_dir = get_worktree_git_dir(worktree);
1317 if (!git_dir)
1318 git_dir = get_git_dir();
1319
1320 argv_array_pushf(&env, "GIT_DIR=%s", absolute_path(git_dir));
1321
1322 if (!find_hook(push_to_checkout_hook))
1323 retval = push_to_deploy(sha1, &env, work_tree);
1324 else
1325 retval = push_to_checkout(sha1, &env, work_tree);
1326
1327 argv_array_clear(&env);
1328 return retval;
1329 }
1330
1331 static const char *update(struct command *cmd, struct shallow_info *si)
1332 {
1333 const char *name = cmd->ref_name;
1334 struct strbuf namespaced_name_buf = STRBUF_INIT;
1335 static char *namespaced_name;
1336 const char *ret;
1337 struct object_id *old_oid = &cmd->old_oid;
1338 struct object_id *new_oid = &cmd->new_oid;
1339 int do_update_worktree = 0;
1340 const struct worktree *worktree = is_bare_repository() ? NULL : find_shared_symref("HEAD", name);
1341
1342 /* only refs/... are allowed */
1343 if (!starts_with(name, "refs/") || check_refname_format(name + 5, 0)) {
1344 rp_error("refusing to create funny ref '%s' remotely", name);
1345 return "funny refname";
1346 }
1347
1348 strbuf_addf(&namespaced_name_buf, "%s%s", get_git_namespace(), name);
1349 free(namespaced_name);
1350 namespaced_name = strbuf_detach(&namespaced_name_buf, NULL);
1351
1352 if (worktree) {
1353 switch (deny_current_branch) {
1354 case DENY_IGNORE:
1355 break;
1356 case DENY_WARN:
1357 rp_warning("updating the current branch");
1358 break;
1359 case DENY_REFUSE:
1360 case DENY_UNCONFIGURED:
1361 rp_error("refusing to update checked out branch: %s", name);
1362 if (deny_current_branch == DENY_UNCONFIGURED)
1363 refuse_unconfigured_deny();
1364 return "branch is currently checked out";
1365 case DENY_UPDATE_INSTEAD:
1366 /* pass -- let other checks intervene first */
1367 do_update_worktree = 1;
1368 break;
1369 }
1370 }
1371
1372 if (!is_null_oid(new_oid) && !has_object_file(new_oid)) {
1373 error("unpack should have generated %s, "
1374 "but I can't find it!", oid_to_hex(new_oid));
1375 return "bad pack";
1376 }
1377
1378 if (!is_null_oid(old_oid) && is_null_oid(new_oid)) {
1379 if (deny_deletes && starts_with(name, "refs/heads/")) {
1380 rp_error("denying ref deletion for %s", name);
1381 return "deletion prohibited";
1382 }
1383
1384 if (worktree || (head_name && !strcmp(namespaced_name, head_name))) {
1385 switch (deny_delete_current) {
1386 case DENY_IGNORE:
1387 break;
1388 case DENY_WARN:
1389 rp_warning("deleting the current branch");
1390 break;
1391 case DENY_REFUSE:
1392 case DENY_UNCONFIGURED:
1393 case DENY_UPDATE_INSTEAD:
1394 if (deny_delete_current == DENY_UNCONFIGURED)
1395 refuse_unconfigured_deny_delete_current();
1396 rp_error("refusing to delete the current branch: %s", name);
1397 return "deletion of the current branch prohibited";
1398 default:
1399 return "Invalid denyDeleteCurrent setting";
1400 }
1401 }
1402 }
1403
1404 if (deny_non_fast_forwards && !is_null_oid(new_oid) &&
1405 !is_null_oid(old_oid) &&
1406 starts_with(name, "refs/heads/")) {
1407 struct object *old_object, *new_object;
1408 struct commit *old_commit, *new_commit;
1409
1410 old_object = parse_object(the_repository, old_oid);
1411 new_object = parse_object(the_repository, new_oid);
1412
1413 if (!old_object || !new_object ||
1414 old_object->type != OBJ_COMMIT ||
1415 new_object->type != OBJ_COMMIT) {
1416 error("bad sha1 objects for %s", name);
1417 return "bad ref";
1418 }
1419 old_commit = (struct commit *)old_object;
1420 new_commit = (struct commit *)new_object;
1421 if (!in_merge_bases(old_commit, new_commit)) {
1422 rp_error("denying non-fast-forward %s"
1423 " (you should pull first)", name);
1424 return "non-fast-forward";
1425 }
1426 }
1427 if (run_update_hook(cmd)) {
1428 rp_error("hook declined to update %s", name);
1429 return "hook declined";
1430 }
1431
1432 if (do_update_worktree) {
1433 ret = update_worktree(new_oid->hash, find_shared_symref("HEAD", name));
1434 if (ret)
1435 return ret;
1436 }
1437
1438 if (is_null_oid(new_oid)) {
1439 struct strbuf err = STRBUF_INIT;
1440 if (!parse_object(the_repository, old_oid)) {
1441 old_oid = NULL;
1442 if (ref_exists(name)) {
1443 rp_warning("Allowing deletion of corrupt ref.");
1444 } else {
1445 rp_warning("Deleting a non-existent ref.");
1446 cmd->did_not_exist = 1;
1447 }
1448 }
1449 if (ref_transaction_delete(transaction,
1450 namespaced_name,
1451 old_oid,
1452 0, "push", &err)) {
1453 rp_error("%s", err.buf);
1454 strbuf_release(&err);
1455 return "failed to delete";
1456 }
1457 strbuf_release(&err);
1458 return NULL; /* good */
1459 }
1460 else {
1461 struct strbuf err = STRBUF_INIT;
1462 if (shallow_update && si->shallow_ref[cmd->index] &&
1463 update_shallow_ref(cmd, si))
1464 return "shallow error";
1465
1466 if (ref_transaction_update(transaction,
1467 namespaced_name,
1468 new_oid, old_oid,
1469 0, "push",
1470 &err)) {
1471 rp_error("%s", err.buf);
1472 strbuf_release(&err);
1473
1474 return "failed to update ref";
1475 }
1476 strbuf_release(&err);
1477
1478 return NULL; /* good */
1479 }
1480 }
1481
1482 static void run_update_post_hook(struct command *commands)
1483 {
1484 struct command *cmd;
1485 struct child_process proc = CHILD_PROCESS_INIT;
1486 const char *hook;
1487
1488 hook = find_hook("post-update");
1489 if (!hook)
1490 return;
1491
1492 for (cmd = commands; cmd; cmd = cmd->next) {
1493 if (cmd->error_string || cmd->did_not_exist)
1494 continue;
1495 if (!proc.args.argc)
1496 argv_array_push(&proc.args, hook);
1497 argv_array_push(&proc.args, cmd->ref_name);
1498 }
1499 if (!proc.args.argc)
1500 return;
1501
1502 proc.no_stdin = 1;
1503 proc.stdout_to_stderr = 1;
1504 proc.err = use_sideband ? -1 : 0;
1505 proc.trace2_hook_name = "post-update";
1506
1507 if (!start_command(&proc)) {
1508 if (use_sideband)
1509 copy_to_sideband(proc.err, -1, NULL);
1510 finish_command(&proc);
1511 }
1512 }
1513
1514 static void check_aliased_update_internal(struct command *cmd,
1515 struct string_list *list,
1516 const char *dst_name, int flag)
1517 {
1518 struct string_list_item *item;
1519 struct command *dst_cmd;
1520
1521 if (!(flag & REF_ISSYMREF))
1522 return;
1523
1524 if (!dst_name) {
1525 rp_error("refusing update to broken symref '%s'", cmd->ref_name);
1526 cmd->skip_update = 1;
1527 cmd->error_string = "broken symref";
1528 return;
1529 }
1530 dst_name = strip_namespace(dst_name);
1531
1532 if ((item = string_list_lookup(list, dst_name)) == NULL)
1533 return;
1534
1535 cmd->skip_update = 1;
1536
1537 dst_cmd = (struct command *) item->util;
1538
1539 if (oideq(&cmd->old_oid, &dst_cmd->old_oid) &&
1540 oideq(&cmd->new_oid, &dst_cmd->new_oid))
1541 return;
1542
1543 dst_cmd->skip_update = 1;
1544
1545 rp_error("refusing inconsistent update between symref '%s' (%s..%s) and"
1546 " its target '%s' (%s..%s)",
1547 cmd->ref_name,
1548 find_unique_abbrev(&cmd->old_oid, DEFAULT_ABBREV),
1549 find_unique_abbrev(&cmd->new_oid, DEFAULT_ABBREV),
1550 dst_cmd->ref_name,
1551 find_unique_abbrev(&dst_cmd->old_oid, DEFAULT_ABBREV),
1552 find_unique_abbrev(&dst_cmd->new_oid, DEFAULT_ABBREV));
1553
1554 cmd->error_string = dst_cmd->error_string =
1555 "inconsistent aliased update";
1556 }
1557
1558 static void check_aliased_update(struct command *cmd, struct string_list *list)
1559 {
1560 struct strbuf buf = STRBUF_INIT;
1561 const char *dst_name;
1562 int flag;
1563
1564 strbuf_addf(&buf, "%s%s", get_git_namespace(), cmd->ref_name);
1565 dst_name = resolve_ref_unsafe(buf.buf, 0, NULL, &flag);
1566 check_aliased_update_internal(cmd, list, dst_name, flag);
1567 strbuf_release(&buf);
1568 }
1569
1570 static void check_aliased_updates(struct command *commands)
1571 {
1572 struct command *cmd;
1573 struct string_list ref_list = STRING_LIST_INIT_NODUP;
1574
1575 for (cmd = commands; cmd; cmd = cmd->next) {
1576 struct string_list_item *item =
1577 string_list_append(&ref_list, cmd->ref_name);
1578 item->util = (void *)cmd;
1579 }
1580 string_list_sort(&ref_list);
1581
1582 for (cmd = commands; cmd; cmd = cmd->next) {
1583 if (!cmd->error_string)
1584 check_aliased_update(cmd, &ref_list);
1585 }
1586
1587 string_list_clear(&ref_list, 0);
1588 }
1589
1590 static int command_singleton_iterator(void *cb_data, struct object_id *oid)
1591 {
1592 struct command **cmd_list = cb_data;
1593 struct command *cmd = *cmd_list;
1594
1595 if (!cmd || is_null_oid(&cmd->new_oid))
1596 return -1; /* end of list */
1597 *cmd_list = NULL; /* this returns only one */
1598 oidcpy(oid, &cmd->new_oid);
1599 return 0;
1600 }
1601
1602 static void set_connectivity_errors(struct command *commands,
1603 struct shallow_info *si)
1604 {
1605 struct command *cmd;
1606
1607 for (cmd = commands; cmd; cmd = cmd->next) {
1608 struct command *singleton = cmd;
1609 struct check_connected_options opt = CHECK_CONNECTED_INIT;
1610
1611 if (shallow_update && si->shallow_ref[cmd->index])
1612 /* to be checked in update_shallow_ref() */
1613 continue;
1614
1615 opt.env = tmp_objdir_env(tmp_objdir);
1616 if (!check_connected(command_singleton_iterator, &singleton,
1617 &opt))
1618 continue;
1619
1620 cmd->error_string = "missing necessary objects";
1621 }
1622 }
1623
1624 struct iterate_data {
1625 struct command *cmds;
1626 struct shallow_info *si;
1627 };
1628
1629 static int iterate_receive_command_list(void *cb_data, struct object_id *oid)
1630 {
1631 struct iterate_data *data = cb_data;
1632 struct command **cmd_list = &data->cmds;
1633 struct command *cmd = *cmd_list;
1634
1635 for (; cmd; cmd = cmd->next) {
1636 if (shallow_update && data->si->shallow_ref[cmd->index])
1637 /* to be checked in update_shallow_ref() */
1638 continue;
1639 if (!is_null_oid(&cmd->new_oid) && !cmd->skip_update) {
1640 oidcpy(oid, &cmd->new_oid);
1641 *cmd_list = cmd->next;
1642 return 0;
1643 }
1644 }
1645 *cmd_list = NULL;
1646 return -1; /* end of list */
1647 }
1648
1649 static void reject_updates_to_hidden(struct command *commands)
1650 {
1651 struct strbuf refname_full = STRBUF_INIT;
1652 size_t prefix_len;
1653 struct command *cmd;
1654
1655 strbuf_addstr(&refname_full, get_git_namespace());
1656 prefix_len = refname_full.len;
1657
1658 for (cmd = commands; cmd; cmd = cmd->next) {
1659 if (cmd->error_string)
1660 continue;
1661
1662 strbuf_setlen(&refname_full, prefix_len);
1663 strbuf_addstr(&refname_full, cmd->ref_name);
1664
1665 if (!ref_is_hidden(cmd->ref_name, refname_full.buf))
1666 continue;
1667 if (is_null_oid(&cmd->new_oid))
1668 cmd->error_string = "deny deleting a hidden ref";
1669 else
1670 cmd->error_string = "deny updating a hidden ref";
1671 }
1672
1673 strbuf_release(&refname_full);
1674 }
1675
1676 static int should_process_cmd(struct command *cmd)
1677 {
1678 return !cmd->error_string && !cmd->skip_update;
1679 }
1680
1681 static void warn_if_skipped_connectivity_check(struct command *commands,
1682 struct shallow_info *si)
1683 {
1684 struct command *cmd;
1685 int checked_connectivity = 1;
1686
1687 for (cmd = commands; cmd; cmd = cmd->next) {
1688 if (should_process_cmd(cmd) && si->shallow_ref[cmd->index]) {
1689 error("BUG: connectivity check has not been run on ref %s",
1690 cmd->ref_name);
1691 checked_connectivity = 0;
1692 }
1693 }
1694 if (!checked_connectivity)
1695 BUG("connectivity check skipped???");
1696 }
1697
1698 static void execute_commands_non_atomic(struct command *commands,
1699 struct shallow_info *si)
1700 {
1701 struct command *cmd;
1702 struct strbuf err = STRBUF_INIT;
1703
1704 for (cmd = commands; cmd; cmd = cmd->next) {
1705 if (!should_process_cmd(cmd) || cmd->run_proc_receive)
1706 continue;
1707
1708 transaction = ref_transaction_begin(&err);
1709 if (!transaction) {
1710 rp_error("%s", err.buf);
1711 strbuf_reset(&err);
1712 cmd->error_string = "transaction failed to start";
1713 continue;
1714 }
1715
1716 cmd->error_string = update(cmd, si);
1717
1718 if (!cmd->error_string
1719 && ref_transaction_commit(transaction, &err)) {
1720 rp_error("%s", err.buf);
1721 strbuf_reset(&err);
1722 cmd->error_string = "failed to update ref";
1723 }
1724 ref_transaction_free(transaction);
1725 }
1726 strbuf_release(&err);
1727 }
1728
1729 static void execute_commands_atomic(struct command *commands,
1730 struct shallow_info *si)
1731 {
1732 struct command *cmd;
1733 struct strbuf err = STRBUF_INIT;
1734 const char *reported_error = "atomic push failure";
1735
1736 transaction = ref_transaction_begin(&err);
1737 if (!transaction) {
1738 rp_error("%s", err.buf);
1739 strbuf_reset(&err);
1740 reported_error = "transaction failed to start";
1741 goto failure;
1742 }
1743
1744 for (cmd = commands; cmd; cmd = cmd->next) {
1745 if (!should_process_cmd(cmd) || cmd->run_proc_receive)
1746 continue;
1747
1748 cmd->error_string = update(cmd, si);
1749
1750 if (cmd->error_string)
1751 goto failure;
1752 }
1753
1754 if (ref_transaction_commit(transaction, &err)) {
1755 rp_error("%s", err.buf);
1756 reported_error = "atomic transaction failed";
1757 goto failure;
1758 }
1759 goto cleanup;
1760
1761 failure:
1762 for (cmd = commands; cmd; cmd = cmd->next)
1763 if (!cmd->error_string)
1764 cmd->error_string = reported_error;
1765
1766 cleanup:
1767 ref_transaction_free(transaction);
1768 strbuf_release(&err);
1769 }
1770
1771 static void execute_commands(struct command *commands,
1772 const char *unpacker_error,
1773 struct shallow_info *si,
1774 const struct string_list *push_options)
1775 {
1776 struct check_connected_options opt = CHECK_CONNECTED_INIT;
1777 struct command *cmd;
1778 struct iterate_data data;
1779 struct async muxer;
1780 int err_fd = 0;
1781 int run_proc_receive = 0;
1782
1783 if (unpacker_error) {
1784 for (cmd = commands; cmd; cmd = cmd->next)
1785 cmd->error_string = "unpacker error";
1786 return;
1787 }
1788
1789 if (use_sideband) {
1790 memset(&muxer, 0, sizeof(muxer));
1791 muxer.proc = copy_to_sideband;
1792 muxer.in = -1;
1793 if (!start_async(&muxer))
1794 err_fd = muxer.in;
1795 /* ...else, continue without relaying sideband */
1796 }
1797
1798 data.cmds = commands;
1799 data.si = si;
1800 opt.err_fd = err_fd;
1801 opt.progress = err_fd && !quiet;
1802 opt.env = tmp_objdir_env(tmp_objdir);
1803 if (check_connected(iterate_receive_command_list, &data, &opt))
1804 set_connectivity_errors(commands, si);
1805
1806 if (use_sideband)
1807 finish_async(&muxer);
1808
1809 reject_updates_to_hidden(commands);
1810
1811 /*
1812 * Try to find commands that have special prefix in their reference names,
1813 * and mark them to run an external "proc-receive" hook later.
1814 */
1815 for (cmd = commands; cmd; cmd = cmd->next) {
1816 if (!should_process_cmd(cmd))
1817 continue;
1818
1819 /* TODO: replace the fixed prefix by looking up git config variables. */
1820 if (!strncmp(cmd->ref_name, "refs/for/", 9)) {
1821 cmd->run_proc_receive = RUN_PROC_RECEIVE_SCHEDULED;
1822 run_proc_receive = 1;
1823 }
1824 }
1825
1826 if (run_receive_hook(commands, "pre-receive", 0, push_options)) {
1827 for (cmd = commands; cmd; cmd = cmd->next) {
1828 if (!cmd->error_string)
1829 cmd->error_string = "pre-receive hook declined";
1830 }
1831 return;
1832 }
1833
1834 /*
1835 * Now we'll start writing out refs, which means the objects need
1836 * to be in their final positions so that other processes can see them.
1837 */
1838 if (tmp_objdir_migrate(tmp_objdir) < 0) {
1839 for (cmd = commands; cmd; cmd = cmd->next) {
1840 if (!cmd->error_string)
1841 cmd->error_string = "unable to migrate objects to permanent storage";
1842 }
1843 return;
1844 }
1845 tmp_objdir = NULL;
1846
1847 check_aliased_updates(commands);
1848
1849 free(head_name_to_free);
1850 head_name = head_name_to_free = resolve_refdup("HEAD", 0, NULL, NULL);
1851
1852 if (run_proc_receive &&
1853 run_proc_receive_hook(commands, push_options))
1854 for (cmd = commands; cmd; cmd = cmd->next)
1855 if (!cmd->error_string &&
1856 !(cmd->run_proc_receive & RUN_PROC_RECEIVE_RETURNED) &&
1857 (cmd->run_proc_receive || use_atomic))
1858 cmd->error_string = "fail to run proc-receive hook";
1859
1860 if (use_atomic)
1861 execute_commands_atomic(commands, si);
1862 else
1863 execute_commands_non_atomic(commands, si);
1864
1865 if (shallow_update)
1866 warn_if_skipped_connectivity_check(commands, si);
1867 }
1868
1869 static struct command **queue_command(struct command **tail,
1870 const char *line,
1871 int linelen)
1872 {
1873 struct object_id old_oid, new_oid;
1874 struct command *cmd;
1875 const char *refname;
1876 int reflen;
1877 const char *p;
1878
1879 if (parse_oid_hex(line, &old_oid, &p) ||
1880 *p++ != ' ' ||
1881 parse_oid_hex(p, &new_oid, &p) ||
1882 *p++ != ' ')
1883 die("protocol error: expected old/new/ref, got '%s'", line);
1884
1885 refname = p;
1886 reflen = linelen - (p - line);
1887 FLEX_ALLOC_MEM(cmd, ref_name, refname, reflen);
1888 oidcpy(&cmd->old_oid, &old_oid);
1889 oidcpy(&cmd->new_oid, &new_oid);
1890 *tail = cmd;
1891 return &cmd->next;
1892 }
1893
1894 static void queue_commands_from_cert(struct command **tail,
1895 struct strbuf *push_cert)
1896 {
1897 const char *boc, *eoc;
1898
1899 if (*tail)
1900 die("protocol error: got both push certificate and unsigned commands");
1901
1902 boc = strstr(push_cert->buf, "\n\n");
1903 if (!boc)
1904 die("malformed push certificate %.*s", 100, push_cert->buf);
1905 else
1906 boc += 2;
1907 eoc = push_cert->buf + parse_signature(push_cert->buf, push_cert->len);
1908
1909 while (boc < eoc) {
1910 const char *eol = memchr(boc, '\n', eoc - boc);
1911 tail = queue_command(tail, boc, eol ? eol - boc : eoc - boc);
1912 boc = eol ? eol + 1 : eoc;
1913 }
1914 }
1915
1916 static struct command *read_head_info(struct packet_reader *reader,
1917 struct oid_array *shallow)
1918 {
1919 struct command *commands = NULL;
1920 struct command **p = &commands;
1921 for (;;) {
1922 int linelen;
1923
1924 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
1925 break;
1926
1927 if (reader->pktlen > 8 && starts_with(reader->line, "shallow ")) {
1928 struct object_id oid;
1929 if (get_oid_hex(reader->line + 8, &oid))
1930 die("protocol error: expected shallow sha, got '%s'",
1931 reader->line + 8);
1932 oid_array_append(shallow, &oid);
1933 continue;
1934 }
1935
1936 linelen = strlen(reader->line);
1937 if (linelen < reader->pktlen) {
1938 const char *feature_list = reader->line + linelen + 1;
1939 if (parse_feature_request(feature_list, "report-status"))
1940 report_status = 1;
1941 if (parse_feature_request(feature_list, "report-status-v2"))
1942 report_status_v2 = 1;
1943 if (parse_feature_request(feature_list, "side-band-64k"))
1944 use_sideband = LARGE_PACKET_MAX;
1945 if (parse_feature_request(feature_list, "quiet"))
1946 quiet = 1;
1947 if (advertise_atomic_push
1948 && parse_feature_request(feature_list, "atomic"))
1949 use_atomic = 1;
1950 if (advertise_push_options
1951 && parse_feature_request(feature_list, "push-options"))
1952 use_push_options = 1;
1953 }
1954
1955 if (!strcmp(reader->line, "push-cert")) {
1956 int true_flush = 0;
1957 int saved_options = reader->options;
1958 reader->options &= ~PACKET_READ_CHOMP_NEWLINE;
1959
1960 for (;;) {
1961 packet_reader_read(reader);
1962 if (reader->status == PACKET_READ_FLUSH) {
1963 true_flush = 1;
1964 break;
1965 }
1966 if (reader->status != PACKET_READ_NORMAL) {
1967 die("protocol error: got an unexpected packet");
1968 }
1969 if (!strcmp(reader->line, "push-cert-end\n"))
1970 break; /* end of cert */
1971 strbuf_addstr(&push_cert, reader->line);
1972 }
1973 reader->options = saved_options;
1974
1975 if (true_flush)
1976 break;
1977 continue;
1978 }
1979
1980 p = queue_command(p, reader->line, linelen);
1981 }
1982
1983 if (push_cert.len)
1984 queue_commands_from_cert(p, &push_cert);
1985
1986 return commands;
1987 }
1988
1989 static void read_push_options(struct packet_reader *reader,
1990 struct string_list *options)
1991 {
1992 while (1) {
1993 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
1994 break;
1995
1996 string_list_append(options, reader->line);
1997 }
1998 }
1999
2000 static const char *parse_pack_header(struct pack_header *hdr)
2001 {
2002 switch (read_pack_header(0, hdr)) {
2003 case PH_ERROR_EOF:
2004 return "eof before pack header was fully read";
2005
2006 case PH_ERROR_PACK_SIGNATURE:
2007 return "protocol error (pack signature mismatch detected)";
2008
2009 case PH_ERROR_PROTOCOL:
2010 return "protocol error (pack version unsupported)";
2011
2012 default:
2013 return "unknown error in parse_pack_header";
2014
2015 case 0:
2016 return NULL;
2017 }
2018 }
2019
2020 static const char *pack_lockfile;
2021
2022 static void push_header_arg(struct argv_array *args, struct pack_header *hdr)
2023 {
2024 argv_array_pushf(args, "--pack_header=%"PRIu32",%"PRIu32,
2025 ntohl(hdr->hdr_version), ntohl(hdr->hdr_entries));
2026 }
2027
2028 static const char *unpack(int err_fd, struct shallow_info *si)
2029 {
2030 struct pack_header hdr;
2031 const char *hdr_err;
2032 int status;
2033 struct child_process child = CHILD_PROCESS_INIT;
2034 int fsck_objects = (receive_fsck_objects >= 0
2035 ? receive_fsck_objects
2036 : transfer_fsck_objects >= 0
2037 ? transfer_fsck_objects
2038 : 0);
2039
2040 hdr_err = parse_pack_header(&hdr);
2041 if (hdr_err) {
2042 if (err_fd > 0)
2043 close(err_fd);
2044 return hdr_err;
2045 }
2046
2047 if (si->nr_ours || si->nr_theirs) {
2048 alt_shallow_file = setup_temporary_shallow(si->shallow);
2049 argv_array_push(&child.args, "--shallow-file");
2050 argv_array_push(&child.args, alt_shallow_file);
2051 }
2052
2053 tmp_objdir = tmp_objdir_create();
2054 if (!tmp_objdir) {
2055 if (err_fd > 0)
2056 close(err_fd);
2057 return "unable to create temporary object directory";
2058 }
2059 child.env = tmp_objdir_env(tmp_objdir);
2060
2061 /*
2062 * Normally we just pass the tmp_objdir environment to the child
2063 * processes that do the heavy lifting, but we may need to see these
2064 * objects ourselves to set up shallow information.
2065 */
2066 tmp_objdir_add_as_alternate(tmp_objdir);
2067
2068 if (ntohl(hdr.hdr_entries) < unpack_limit) {
2069 argv_array_push(&child.args, "unpack-objects");
2070 push_header_arg(&child.args, &hdr);
2071 if (quiet)
2072 argv_array_push(&child.args, "-q");
2073 if (fsck_objects)
2074 argv_array_pushf(&child.args, "--strict%s",
2075 fsck_msg_types.buf);
2076 if (max_input_size)
2077 argv_array_pushf(&child.args, "--max-input-size=%"PRIuMAX,
2078 (uintmax_t)max_input_size);
2079 child.no_stdout = 1;
2080 child.err = err_fd;
2081 child.git_cmd = 1;
2082 status = run_command(&child);
2083 if (status)
2084 return "unpack-objects abnormal exit";
2085 } else {
2086 char hostname[HOST_NAME_MAX + 1];
2087
2088 argv_array_pushl(&child.args, "index-pack", "--stdin", NULL);
2089 push_header_arg(&child.args, &hdr);
2090
2091 if (xgethostname(hostname, sizeof(hostname)))
2092 xsnprintf(hostname, sizeof(hostname), "localhost");
2093 argv_array_pushf(&child.args,
2094 "--keep=receive-pack %"PRIuMAX" on %s",
2095 (uintmax_t)getpid(),
2096 hostname);
2097
2098 if (!quiet && err_fd)
2099 argv_array_push(&child.args, "--show-resolving-progress");
2100 if (use_sideband)
2101 argv_array_push(&child.args, "--report-end-of-input");
2102 if (fsck_objects)
2103 argv_array_pushf(&child.args, "--strict%s",
2104 fsck_msg_types.buf);
2105 if (!reject_thin)
2106 argv_array_push(&child.args, "--fix-thin");
2107 if (max_input_size)
2108 argv_array_pushf(&child.args, "--max-input-size=%"PRIuMAX,
2109 (uintmax_t)max_input_size);
2110 child.out = -1;
2111 child.err = err_fd;
2112 child.git_cmd = 1;
2113 status = start_command(&child);
2114 if (status)
2115 return "index-pack fork failed";
2116 pack_lockfile = index_pack_lockfile(child.out);
2117 close(child.out);
2118 status = finish_command(&child);
2119 if (status)
2120 return "index-pack abnormal exit";
2121 reprepare_packed_git(the_repository);
2122 }
2123 return NULL;
2124 }
2125
2126 static const char *unpack_with_sideband(struct shallow_info *si)
2127 {
2128 struct async muxer;
2129 const char *ret;
2130
2131 if (!use_sideband)
2132 return unpack(0, si);
2133
2134 use_keepalive = KEEPALIVE_AFTER_NUL;
2135 memset(&muxer, 0, sizeof(muxer));
2136 muxer.proc = copy_to_sideband;
2137 muxer.in = -1;
2138 if (start_async(&muxer))
2139 return NULL;
2140
2141 ret = unpack(muxer.in, si);
2142
2143 finish_async(&muxer);
2144 return ret;
2145 }
2146
2147 static void prepare_shallow_update(struct shallow_info *si)
2148 {
2149 int i, j, k, bitmap_size = DIV_ROUND_UP(si->ref->nr, 32);
2150
2151 ALLOC_ARRAY(si->used_shallow, si->shallow->nr);
2152 assign_shallow_commits_to_refs(si, si->used_shallow, NULL);
2153
2154 si->need_reachability_test =
2155 xcalloc(si->shallow->nr, sizeof(*si->need_reachability_test));
2156 si->reachable =
2157 xcalloc(si->shallow->nr, sizeof(*si->reachable));
2158 si->shallow_ref = xcalloc(si->ref->nr, sizeof(*si->shallow_ref));
2159
2160 for (i = 0; i < si->nr_ours; i++)
2161 si->need_reachability_test[si->ours[i]] = 1;
2162
2163 for (i = 0; i < si->shallow->nr; i++) {
2164 if (!si->used_shallow[i])
2165 continue;
2166 for (j = 0; j < bitmap_size; j++) {
2167 if (!si->used_shallow[i][j])
2168 continue;
2169 si->need_reachability_test[i]++;
2170 for (k = 0; k < 32; k++)
2171 if (si->used_shallow[i][j] & (1U << k))
2172 si->shallow_ref[j * 32 + k]++;
2173 }
2174
2175 /*
2176 * true for those associated with some refs and belong
2177 * in "ours" list aka "step 7 not done yet"
2178 */
2179 si->need_reachability_test[i] =
2180 si->need_reachability_test[i] > 1;
2181 }
2182
2183 /*
2184 * keep hooks happy by forcing a temporary shallow file via
2185 * env variable because we can't add --shallow-file to every
2186 * command. check_connected() will be done with
2187 * true .git/shallow though.
2188 */
2189 setenv(GIT_SHALLOW_FILE_ENVIRONMENT, alt_shallow_file, 1);
2190 }
2191
2192 static void update_shallow_info(struct command *commands,
2193 struct shallow_info *si,
2194 struct oid_array *ref)
2195 {
2196 struct command *cmd;
2197 int *ref_status;
2198 remove_nonexistent_theirs_shallow(si);
2199 if (!si->nr_ours && !si->nr_theirs) {
2200 shallow_update = 0;
2201 return;
2202 }
2203
2204 for (cmd = commands; cmd; cmd = cmd->next) {
2205 if (is_null_oid(&cmd->new_oid))
2206 continue;
2207 oid_array_append(ref, &cmd->new_oid);
2208 cmd->index = ref->nr - 1;
2209 }
2210 si->ref = ref;
2211
2212 if (shallow_update) {
2213 prepare_shallow_update(si);
2214 return;
2215 }
2216
2217 ALLOC_ARRAY(ref_status, ref->nr);
2218 assign_shallow_commits_to_refs(si, NULL, ref_status);
2219 for (cmd = commands; cmd; cmd = cmd->next) {
2220 if (is_null_oid(&cmd->new_oid))
2221 continue;
2222 if (ref_status[cmd->index]) {
2223 cmd->error_string = "shallow update not allowed";
2224 cmd->skip_update = 1;
2225 }
2226 }
2227 free(ref_status);
2228 }
2229
2230 static void report(struct command *commands, const char *unpack_status)
2231 {
2232 struct command *cmd;
2233 struct strbuf buf = STRBUF_INIT;
2234
2235 packet_buf_write(&buf, "unpack %s\n",
2236 unpack_status ? unpack_status : "ok");
2237 for (cmd = commands; cmd; cmd = cmd->next) {
2238 if (!cmd->error_string)
2239 packet_buf_write(&buf, "ok %s\n",
2240 cmd->ref_name);
2241 else
2242 packet_buf_write(&buf, "ng %s %s\n",
2243 cmd->ref_name, cmd->error_string);
2244 }
2245 packet_buf_flush(&buf);
2246
2247 if (use_sideband)
2248 send_sideband(1, 1, buf.buf, buf.len, use_sideband);
2249 else
2250 write_or_die(1, buf.buf, buf.len);
2251 strbuf_release(&buf);
2252 }
2253
2254 static void report_v2(struct command *commands, const char *unpack_status)
2255 {
2256 struct command *cmd;
2257 struct strbuf buf = STRBUF_INIT;
2258 struct ref_push_report *report;
2259
2260 packet_buf_write(&buf, "unpack %s\n",
2261 unpack_status ? unpack_status : "ok");
2262 for (cmd = commands; cmd; cmd = cmd->next) {
2263 int count = 0;
2264
2265 if (cmd->error_string) {
2266 packet_buf_write(&buf, "ng %s %s\n",
2267 cmd->ref_name,
2268 cmd->error_string);
2269 continue;
2270 }
2271 packet_buf_write(&buf, "ok %s\n",
2272 cmd->ref_name);
2273 for (report = cmd->report; report; report = report->next) {
2274 if (count++ > 0)
2275 packet_buf_write(&buf, "ok %s\n",
2276 cmd->ref_name);
2277 if (report->ref_name)
2278 packet_buf_write(&buf, "option refname %s\n",
2279 report->ref_name);
2280 if (report->old_oid)
2281 packet_buf_write(&buf, "option old-oid %s\n",
2282 oid_to_hex(report->old_oid));
2283 if (report->new_oid)
2284 packet_buf_write(&buf, "option new-oid %s\n",
2285 oid_to_hex(report->new_oid));
2286 if (report->forced_update)
2287 packet_buf_write(&buf, "option forced-update\n");
2288 }
2289 }
2290 packet_buf_flush(&buf);
2291
2292 if (use_sideband)
2293 send_sideband(1, 1, buf.buf, buf.len, use_sideband);
2294 else
2295 write_or_die(1, buf.buf, buf.len);
2296 strbuf_release(&buf);
2297 }
2298
2299 static int delete_only(struct command *commands)
2300 {
2301 struct command *cmd;
2302 for (cmd = commands; cmd; cmd = cmd->next) {
2303 if (!is_null_oid(&cmd->new_oid))
2304 return 0;
2305 }
2306 return 1;
2307 }
2308
2309 int cmd_receive_pack(int argc, const char **argv, const char *prefix)
2310 {
2311 int advertise_refs = 0;
2312 struct command *commands;
2313 struct oid_array shallow = OID_ARRAY_INIT;
2314 struct oid_array ref = OID_ARRAY_INIT;
2315 struct shallow_info si;
2316 struct packet_reader reader;
2317
2318 struct option options[] = {
2319 OPT__QUIET(&quiet, N_("quiet")),
2320 OPT_HIDDEN_BOOL(0, "stateless-rpc", &stateless_rpc, NULL),
2321 OPT_HIDDEN_BOOL(0, "advertise-refs", &advertise_refs, NULL),
2322 OPT_HIDDEN_BOOL(0, "reject-thin-pack-for-testing", &reject_thin, NULL),
2323 OPT_END()
2324 };
2325
2326 packet_trace_identity("receive-pack");
2327
2328 argc = parse_options(argc, argv, prefix, options, receive_pack_usage, 0);
2329
2330 if (argc > 1)
2331 usage_msg_opt(_("Too many arguments."), receive_pack_usage, options);
2332 if (argc == 0)
2333 usage_msg_opt(_("You must specify a directory."), receive_pack_usage, options);
2334
2335 service_dir = argv[0];
2336
2337 setup_path();
2338
2339 if (!enter_repo(service_dir, 0))
2340 die("'%s' does not appear to be a git repository", service_dir);
2341
2342 git_config(receive_pack_config, NULL);
2343 if (cert_nonce_seed)
2344 push_cert_nonce = prepare_push_cert_nonce(service_dir, time(NULL));
2345
2346 if (0 <= transfer_unpack_limit)
2347 unpack_limit = transfer_unpack_limit;
2348 else if (0 <= receive_unpack_limit)
2349 unpack_limit = receive_unpack_limit;
2350
2351 switch (determine_protocol_version_server()) {
2352 case protocol_v2:
2353 /*
2354 * push support for protocol v2 has not been implemented yet,
2355 * so ignore the request to use v2 and fallback to using v0.
2356 */
2357 break;
2358 case protocol_v1:
2359 /*
2360 * v1 is just the original protocol with a version string,
2361 * so just fall through after writing the version string.
2362 */
2363 if (advertise_refs || !stateless_rpc)
2364 packet_write_fmt(1, "version 1\n");
2365
2366 /* fallthrough */
2367 case protocol_v0:
2368 break;
2369 case protocol_unknown_version:
2370 BUG("unknown protocol version");
2371 }
2372
2373 if (advertise_refs || !stateless_rpc) {
2374 write_head_info();
2375 }
2376 if (advertise_refs)
2377 return 0;
2378
2379 packet_reader_init(&reader, 0, NULL, 0,
2380 PACKET_READ_CHOMP_NEWLINE |
2381 PACKET_READ_DIE_ON_ERR_PACKET);
2382
2383 if ((commands = read_head_info(&reader, &shallow)) != NULL) {
2384 const char *unpack_status = NULL;
2385 struct string_list push_options = STRING_LIST_INIT_DUP;
2386
2387 if (use_push_options)
2388 read_push_options(&reader, &push_options);
2389 if (!check_cert_push_options(&push_options)) {
2390 struct command *cmd;
2391 for (cmd = commands; cmd; cmd = cmd->next)
2392 cmd->error_string = "inconsistent push options";
2393 }
2394
2395 prepare_shallow_info(&si, &shallow);
2396 if (!si.nr_ours && !si.nr_theirs)
2397 shallow_update = 0;
2398 if (!delete_only(commands)) {
2399 unpack_status = unpack_with_sideband(&si);
2400 update_shallow_info(commands, &si, &ref);
2401 }
2402 use_keepalive = KEEPALIVE_ALWAYS;
2403 execute_commands(commands, unpack_status, &si,
2404 &push_options);
2405 if (pack_lockfile)
2406 unlink_or_warn(pack_lockfile);
2407 if (report_status_v2)
2408 report_v2(commands, unpack_status);
2409 else if (report_status)
2410 report(commands, unpack_status);
2411 run_receive_hook(commands, "post-receive", 1,
2412 &push_options);
2413 run_update_post_hook(commands);
2414 string_list_clear(&push_options, 0);
2415 if (auto_gc) {
2416 const char *argv_gc_auto[] = {
2417 "gc", "--auto", "--quiet", NULL,
2418 };
2419 struct child_process proc = CHILD_PROCESS_INIT;
2420
2421 proc.no_stdin = 1;
2422 proc.stdout_to_stderr = 1;
2423 proc.err = use_sideband ? -1 : 0;
2424 proc.git_cmd = 1;
2425 proc.argv = argv_gc_auto;
2426
2427 close_object_store(the_repository->objects);
2428 if (!start_command(&proc)) {
2429 if (use_sideband)
2430 copy_to_sideband(proc.err, -1, NULL);
2431 finish_command(&proc);
2432 }
2433 }
2434 if (auto_update_server_info)
2435 update_server_info(0);
2436 clear_shallow_info(&si);
2437 }
2438 if (use_sideband)
2439 packet_flush(1);
2440 oid_array_clear(&shallow);
2441 oid_array_clear(&ref);
2442 free((void *)push_cert_nonce);
2443 return 0;
2444 }
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