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receive-pack: update comment with check_everything_connected
[git.git] / builtin / receive-pack.c
blob8744faf897e28e8ee3c3d61ec505da2166e3f939
1 #include "builtin.h"
2 #include "lockfile.h"
3 #include "pack.h"
4 #include "refs.h"
5 #include "pkt-line.h"
6 #include "sideband.h"
7 #include "run-command.h"
8 #include "exec_cmd.h"
9 #include "commit.h"
10 #include "object.h"
11 #include "remote.h"
12 #include "connect.h"
13 #include "transport.h"
14 #include "string-list.h"
15 #include "sha1-array.h"
16 #include "connected.h"
17 #include "argv-array.h"
18 #include "version.h"
19 #include "tag.h"
20 #include "gpg-interface.h"
21 #include "sigchain.h"
22 #include "fsck.h"
23
24 static const char * const receive_pack_usage[] = {
25 N_("git receive-pack <git-dir>"),
26 NULL
27 };
28
29 enum deny_action {
30 DENY_UNCONFIGURED,
31 DENY_IGNORE,
32 DENY_WARN,
33 DENY_REFUSE,
34 DENY_UPDATE_INSTEAD
35 };
36
37 static int deny_deletes;
38 static int deny_non_fast_forwards;
39 static enum deny_action deny_current_branch = DENY_UNCONFIGURED;
40 static enum deny_action deny_delete_current = DENY_UNCONFIGURED;
41 static int receive_fsck_objects = -1;
42 static int transfer_fsck_objects = -1;
43 static struct strbuf fsck_msg_types = STRBUF_INIT;
44 static int receive_unpack_limit = -1;
45 static int transfer_unpack_limit = -1;
46 static int advertise_atomic_push = 1;
47 static int unpack_limit = 100;
48 static int report_status;
49 static int use_sideband;
50 static int use_atomic;
51 static int quiet;
52 static int prefer_ofs_delta = 1;
53 static int auto_update_server_info;
54 static int auto_gc = 1;
55 static int reject_thin;
56 static int stateless_rpc;
57 static const char *service_dir;
58 static const char *head_name;
59 static void *head_name_to_free;
60 static int sent_capabilities;
61 static int shallow_update;
62 static const char *alt_shallow_file;
63 static struct strbuf push_cert = STRBUF_INIT;
64 static unsigned char push_cert_sha1[20];
65 static struct signature_check sigcheck;
66 static const char *push_cert_nonce;
67 static const char *cert_nonce_seed;
68
69 static const char *NONCE_UNSOLICITED = "UNSOLICITED";
70 static const char *NONCE_BAD = "BAD";
71 static const char *NONCE_MISSING = "MISSING";
72 static const char *NONCE_OK = "OK";
73 static const char *NONCE_SLOP = "SLOP";
74 static const char *nonce_status;
75 static long nonce_stamp_slop;
76 static unsigned long nonce_stamp_slop_limit;
77 static struct ref_transaction *transaction;
78
79 static enum deny_action parse_deny_action(const char *var, const char *value)
80 {
81 if (value) {
82 if (!strcasecmp(value, "ignore"))
83 return DENY_IGNORE;
84 if (!strcasecmp(value, "warn"))
85 return DENY_WARN;
86 if (!strcasecmp(value, "refuse"))
87 return DENY_REFUSE;
88 if (!strcasecmp(value, "updateinstead"))
89 return DENY_UPDATE_INSTEAD;
90 }
91 if (git_config_bool(var, value))
92 return DENY_REFUSE;
93 return DENY_IGNORE;
94 }
95
96 static int receive_pack_config(const char *var, const char *value, void *cb)
97 {
98 int status = parse_hide_refs_config(var, value, "receive");
99
100 if (status)
101 return status;
102
103 if (strcmp(var, "receive.denydeletes") == 0) {
104 deny_deletes = git_config_bool(var, value);
105 return 0;
106 }
107
108 if (strcmp(var, "receive.denynonfastforwards") == 0) {
109 deny_non_fast_forwards = git_config_bool(var, value);
110 return 0;
111 }
112
113 if (strcmp(var, "receive.unpacklimit") == 0) {
114 receive_unpack_limit = git_config_int(var, value);
115 return 0;
116 }
117
118 if (strcmp(var, "transfer.unpacklimit") == 0) {
119 transfer_unpack_limit = git_config_int(var, value);
120 return 0;
121 }
122
123 if (strcmp(var, "receive.fsck.skiplist") == 0) {
124 const char *path;
125
126 if (git_config_pathname(&path, var, value))
127 return 1;
128 strbuf_addf(&fsck_msg_types, "%cskiplist=%s",
129 fsck_msg_types.len ? ',' : '=', path);
130 free((char *)path);
131 return 0;
132 }
133
134 if (skip_prefix(var, "receive.fsck.", &var)) {
135 if (is_valid_msg_type(var, value))
136 strbuf_addf(&fsck_msg_types, "%c%s=%s",
137 fsck_msg_types.len ? ',' : '=', var, value);
138 else
139 warning("Skipping unknown msg id '%s'", var);
140 return 0;
141 }
142
143 if (strcmp(var, "receive.fsckobjects") == 0) {
144 receive_fsck_objects = git_config_bool(var, value);
145 return 0;
146 }
147
148 if (strcmp(var, "transfer.fsckobjects") == 0) {
149 transfer_fsck_objects = git_config_bool(var, value);
150 return 0;
151 }
152
153 if (!strcmp(var, "receive.denycurrentbranch")) {
154 deny_current_branch = parse_deny_action(var, value);
155 return 0;
156 }
157
158 if (strcmp(var, "receive.denydeletecurrent") == 0) {
159 deny_delete_current = parse_deny_action(var, value);
160 return 0;
161 }
162
163 if (strcmp(var, "repack.usedeltabaseoffset") == 0) {
164 prefer_ofs_delta = git_config_bool(var, value);
165 return 0;
166 }
167
168 if (strcmp(var, "receive.updateserverinfo") == 0) {
169 auto_update_server_info = git_config_bool(var, value);
170 return 0;
171 }
172
173 if (strcmp(var, "receive.autogc") == 0) {
174 auto_gc = git_config_bool(var, value);
175 return 0;
176 }
177
178 if (strcmp(var, "receive.shallowupdate") == 0) {
179 shallow_update = git_config_bool(var, value);
180 return 0;
181 }
182
183 if (strcmp(var, "receive.certnonceseed") == 0)
184 return git_config_string(&cert_nonce_seed, var, value);
185
186 if (strcmp(var, "receive.certnonceslop") == 0) {
187 nonce_stamp_slop_limit = git_config_ulong(var, value);
188 return 0;
189 }
190
191 if (strcmp(var, "receive.advertiseatomic") == 0) {
192 advertise_atomic_push = git_config_bool(var, value);
193 return 0;
194 }
195
196 return git_default_config(var, value, cb);
197 }
198
199 static void show_ref(const char *path, const unsigned char *sha1)
200 {
201 if (sent_capabilities) {
202 packet_write(1, "%s %s\n", sha1_to_hex(sha1), path);
203 } else {
204 struct strbuf cap = STRBUF_INIT;
205
206 strbuf_addstr(&cap,
207 "report-status delete-refs side-band-64k quiet");
208 if (advertise_atomic_push)
209 strbuf_addstr(&cap, " atomic");
210 if (prefer_ofs_delta)
211 strbuf_addstr(&cap, " ofs-delta");
212 if (push_cert_nonce)
213 strbuf_addf(&cap, " push-cert=%s", push_cert_nonce);
214 strbuf_addf(&cap, " agent=%s", git_user_agent_sanitized());
215 packet_write(1, "%s %s%c%s\n",
216 sha1_to_hex(sha1), path, 0, cap.buf);
217 strbuf_release(&cap);
218 sent_capabilities = 1;
219 }
220 }
221
222 static int show_ref_cb(const char *path_full, const struct object_id *oid,
223 int flag, void *unused)
224 {
225 const char *path = strip_namespace(path_full);
226
227 if (ref_is_hidden(path, path_full))
228 return 0;
229
230 /*
231 * Advertise refs outside our current namespace as ".have"
232 * refs, so that the client can use them to minimize data
233 * transfer but will otherwise ignore them. This happens to
234 * cover ".have" that are thrown in by add_one_alternate_ref()
235 * to mark histories that are complete in our alternates as
236 * well.
237 */
238 if (!path)
239 path = ".have";
240 show_ref(path, oid->hash);
241 return 0;
242 }
243
244 static void show_one_alternate_sha1(const unsigned char sha1[20], void *unused)
245 {
246 show_ref(".have", sha1);
247 }
248
249 static void collect_one_alternate_ref(const struct ref *ref, void *data)
250 {
251 struct sha1_array *sa = data;
252 sha1_array_append(sa, ref->old_oid.hash);
253 }
254
255 static void write_head_info(void)
256 {
257 struct sha1_array sa = SHA1_ARRAY_INIT;
258
259 for_each_alternate_ref(collect_one_alternate_ref, &sa);
260 sha1_array_for_each_unique(&sa, show_one_alternate_sha1, NULL);
261 sha1_array_clear(&sa);
262 for_each_ref(show_ref_cb, NULL);
263 if (!sent_capabilities)
264 show_ref("capabilities^{}", null_sha1);
265
266 advertise_shallow_grafts(1);
267
268 /* EOF */
269 packet_flush(1);
270 }
271
272 struct command {
273 struct command *next;
274 const char *error_string;
275 unsigned int skip_update:1,
276 did_not_exist:1;
277 int index;
278 unsigned char old_sha1[20];
279 unsigned char new_sha1[20];
280 char ref_name[FLEX_ARRAY]; /* more */
281 };
282
283 static void rp_error(const char *err, ...) __attribute__((format (printf, 1, 2)));
284 static void rp_warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
285
286 static void report_message(const char *prefix, const char *err, va_list params)
287 {
288 int sz;
289 char msg[4096];
290
291 sz = xsnprintf(msg, sizeof(msg), "%s", prefix);
292 sz += vsnprintf(msg + sz, sizeof(msg) - sz, err, params);
293 if (sz > (sizeof(msg) - 1))
294 sz = sizeof(msg) - 1;
295 msg[sz++] = '\n';
296
297 if (use_sideband)
298 send_sideband(1, 2, msg, sz, use_sideband);
299 else
300 xwrite(2, msg, sz);
301 }
302
303 static void rp_warning(const char *err, ...)
304 {
305 va_list params;
306 va_start(params, err);
307 report_message("warning: ", err, params);
308 va_end(params);
309 }
310
311 static void rp_error(const char *err, ...)
312 {
313 va_list params;
314 va_start(params, err);
315 report_message("error: ", err, params);
316 va_end(params);
317 }
318
319 static int copy_to_sideband(int in, int out, void *arg)
320 {
321 char data[128];
322 while (1) {
323 ssize_t sz = xread(in, data, sizeof(data));
324 if (sz <= 0)
325 break;
326 send_sideband(1, 2, data, sz, use_sideband);
327 }
328 close(in);
329 return 0;
330 }
331
332 #define HMAC_BLOCK_SIZE 64
333
334 static void hmac_sha1(unsigned char *out,
335 const char *key_in, size_t key_len,
336 const char *text, size_t text_len)
337 {
338 unsigned char key[HMAC_BLOCK_SIZE];
339 unsigned char k_ipad[HMAC_BLOCK_SIZE];
340 unsigned char k_opad[HMAC_BLOCK_SIZE];
341 int i;
342 git_SHA_CTX ctx;
343
344 /* RFC 2104 2. (1) */
345 memset(key, '\0', HMAC_BLOCK_SIZE);
346 if (HMAC_BLOCK_SIZE < key_len) {
347 git_SHA1_Init(&ctx);
348 git_SHA1_Update(&ctx, key_in, key_len);
349 git_SHA1_Final(key, &ctx);
350 } else {
351 memcpy(key, key_in, key_len);
352 }
353
354 /* RFC 2104 2. (2) & (5) */
355 for (i = 0; i < sizeof(key); i++) {
356 k_ipad[i] = key[i] ^ 0x36;
357 k_opad[i] = key[i] ^ 0x5c;
358 }
359
360 /* RFC 2104 2. (3) & (4) */
361 git_SHA1_Init(&ctx);
362 git_SHA1_Update(&ctx, k_ipad, sizeof(k_ipad));
363 git_SHA1_Update(&ctx, text, text_len);
364 git_SHA1_Final(out, &ctx);
365
366 /* RFC 2104 2. (6) & (7) */
367 git_SHA1_Init(&ctx);
368 git_SHA1_Update(&ctx, k_opad, sizeof(k_opad));
369 git_SHA1_Update(&ctx, out, 20);
370 git_SHA1_Final(out, &ctx);
371 }
372
373 static char *prepare_push_cert_nonce(const char *path, unsigned long stamp)
374 {
375 struct strbuf buf = STRBUF_INIT;
376 unsigned char sha1[20];
377
378 strbuf_addf(&buf, "%s:%lu", path, stamp);
379 hmac_sha1(sha1, buf.buf, buf.len, cert_nonce_seed, strlen(cert_nonce_seed));;
380 strbuf_release(&buf);
381
382 /* RFC 2104 5. HMAC-SHA1-80 */
383 strbuf_addf(&buf, "%lu-%.*s", stamp, 20, sha1_to_hex(sha1));
384 return strbuf_detach(&buf, NULL);
385 }
386
387 /*
388 * NEEDSWORK: reuse find_commit_header() from jk/commit-author-parsing
389 * after dropping "_commit" from its name and possibly moving it out
390 * of commit.c
391 */
392 static char *find_header(const char *msg, size_t len, const char *key)
393 {
394 int key_len = strlen(key);
395 const char *line = msg;
396
397 while (line && line < msg + len) {
398 const char *eol = strchrnul(line, '\n');
399
400 if ((msg + len <= eol) || line == eol)
401 return NULL;
402 if (line + key_len < eol &&
403 !memcmp(line, key, key_len) && line[key_len] == ' ') {
404 int offset = key_len + 1;
405 return xmemdupz(line + offset, (eol - line) - offset);
406 }
407 line = *eol ? eol + 1 : NULL;
408 }
409 return NULL;
410 }
411
412 static const char *check_nonce(const char *buf, size_t len)
413 {
414 char *nonce = find_header(buf, len, "nonce");
415 unsigned long stamp, ostamp;
416 char *bohmac, *expect = NULL;
417 const char *retval = NONCE_BAD;
418
419 if (!nonce) {
420 retval = NONCE_MISSING;
421 goto leave;
422 } else if (!push_cert_nonce) {
423 retval = NONCE_UNSOLICITED;
424 goto leave;
425 } else if (!strcmp(push_cert_nonce, nonce)) {
426 retval = NONCE_OK;
427 goto leave;
428 }
429
430 if (!stateless_rpc) {
431 /* returned nonce MUST match what we gave out earlier */
432 retval = NONCE_BAD;
433 goto leave;
434 }
435
436 /*
437 * In stateless mode, we may be receiving a nonce issued by
438 * another instance of the server that serving the same
439 * repository, and the timestamps may not match, but the
440 * nonce-seed and dir should match, so we can recompute and
441 * report the time slop.
442 *
443 * In addition, when a nonce issued by another instance has
444 * timestamp within receive.certnonceslop seconds, we pretend
445 * as if we issued that nonce when reporting to the hook.
446 */
447
448 /* nonce is concat(<seconds-since-epoch>, "-", <hmac>) */
449 if (*nonce <= '0' || '9' < *nonce) {
450 retval = NONCE_BAD;
451 goto leave;
452 }
453 stamp = strtoul(nonce, &bohmac, 10);
454 if (bohmac == nonce || bohmac[0] != '-') {
455 retval = NONCE_BAD;
456 goto leave;
457 }
458
459 expect = prepare_push_cert_nonce(service_dir, stamp);
460 if (strcmp(expect, nonce)) {
461 /* Not what we would have signed earlier */
462 retval = NONCE_BAD;
463 goto leave;
464 }
465
466 /*
467 * By how many seconds is this nonce stale? Negative value
468 * would mean it was issued by another server with its clock
469 * skewed in the future.
470 */
471 ostamp = strtoul(push_cert_nonce, NULL, 10);
472 nonce_stamp_slop = (long)ostamp - (long)stamp;
473
474 if (nonce_stamp_slop_limit &&
475 labs(nonce_stamp_slop) <= nonce_stamp_slop_limit) {
476 /*
477 * Pretend as if the received nonce (which passes the
478 * HMAC check, so it is not a forged by third-party)
479 * is what we issued.
480 */
481 free((void *)push_cert_nonce);
482 push_cert_nonce = xstrdup(nonce);
483 retval = NONCE_OK;
484 } else {
485 retval = NONCE_SLOP;
486 }
487
488 leave:
489 free(nonce);
490 free(expect);
491 return retval;
492 }
493
494 static void prepare_push_cert_sha1(struct child_process *proc)
495 {
496 static int already_done;
497
498 if (!push_cert.len)
499 return;
500
501 if (!already_done) {
502 struct strbuf gpg_output = STRBUF_INIT;
503 struct strbuf gpg_status = STRBUF_INIT;
504 int bogs /* beginning_of_gpg_sig */;
505
506 already_done = 1;
507 if (write_sha1_file(push_cert.buf, push_cert.len, "blob", push_cert_sha1))
508 hashclr(push_cert_sha1);
509
510 memset(&sigcheck, '\0', sizeof(sigcheck));
511 sigcheck.result = 'N';
512
513 bogs = parse_signature(push_cert.buf, push_cert.len);
514 if (verify_signed_buffer(push_cert.buf, bogs,
515 push_cert.buf + bogs, push_cert.len - bogs,
516 &gpg_output, &gpg_status) < 0) {
517 ; /* error running gpg */
518 } else {
519 sigcheck.payload = push_cert.buf;
520 sigcheck.gpg_output = gpg_output.buf;
521 sigcheck.gpg_status = gpg_status.buf;
522 parse_gpg_output(&sigcheck);
523 }
524
525 strbuf_release(&gpg_output);
526 strbuf_release(&gpg_status);
527 nonce_status = check_nonce(push_cert.buf, bogs);
528 }
529 if (!is_null_sha1(push_cert_sha1)) {
530 argv_array_pushf(&proc->env_array, "GIT_PUSH_CERT=%s",
531 sha1_to_hex(push_cert_sha1));
532 argv_array_pushf(&proc->env_array, "GIT_PUSH_CERT_SIGNER=%s",
533 sigcheck.signer ? sigcheck.signer : "");
534 argv_array_pushf(&proc->env_array, "GIT_PUSH_CERT_KEY=%s",
535 sigcheck.key ? sigcheck.key : "");
536 argv_array_pushf(&proc->env_array, "GIT_PUSH_CERT_STATUS=%c",
537 sigcheck.result);
538 if (push_cert_nonce) {
539 argv_array_pushf(&proc->env_array,
540 "GIT_PUSH_CERT_NONCE=%s",
541 push_cert_nonce);
542 argv_array_pushf(&proc->env_array,
543 "GIT_PUSH_CERT_NONCE_STATUS=%s",
544 nonce_status);
545 if (nonce_status == NONCE_SLOP)
546 argv_array_pushf(&proc->env_array,
547 "GIT_PUSH_CERT_NONCE_SLOP=%ld",
548 nonce_stamp_slop);
549 }
550 }
551 }
552
553 typedef int (*feed_fn)(void *, const char **, size_t *);
554 static int run_and_feed_hook(const char *hook_name, feed_fn feed, void *feed_state)
555 {
556 struct child_process proc = CHILD_PROCESS_INIT;
557 struct async muxer;
558 const char *argv[2];
559 int code;
560
561 argv[0] = find_hook(hook_name);
562 if (!argv[0])
563 return 0;
564
565 argv[1] = NULL;
566
567 proc.argv = argv;
568 proc.in = -1;
569 proc.stdout_to_stderr = 1;
570
571 if (use_sideband) {
572 memset(&muxer, 0, sizeof(muxer));
573 muxer.proc = copy_to_sideband;
574 muxer.in = -1;
575 code = start_async(&muxer);
576 if (code)
577 return code;
578 proc.err = muxer.in;
579 }
580
581 prepare_push_cert_sha1(&proc);
582
583 code = start_command(&proc);
584 if (code) {
585 if (use_sideband)
586 finish_async(&muxer);
587 return code;
588 }
589
590 sigchain_push(SIGPIPE, SIG_IGN);
591
592 while (1) {
593 const char *buf;
594 size_t n;
595 if (feed(feed_state, &buf, &n))
596 break;
597 if (write_in_full(proc.in, buf, n) != n)
598 break;
599 }
600 close(proc.in);
601 if (use_sideband)
602 finish_async(&muxer);
603
604 sigchain_pop(SIGPIPE);
605
606 return finish_command(&proc);
607 }
608
609 struct receive_hook_feed_state {
610 struct command *cmd;
611 int skip_broken;
612 struct strbuf buf;
613 };
614
615 static int feed_receive_hook(void *state_, const char **bufp, size_t *sizep)
616 {
617 struct receive_hook_feed_state *state = state_;
618 struct command *cmd = state->cmd;
619
620 while (cmd &&
621 state->skip_broken && (cmd->error_string || cmd->did_not_exist))
622 cmd = cmd->next;
623 if (!cmd)
624 return -1; /* EOF */
625 strbuf_reset(&state->buf);
626 strbuf_addf(&state->buf, "%s %s %s\n",
627 sha1_to_hex(cmd->old_sha1), sha1_to_hex(cmd->new_sha1),
628 cmd->ref_name);
629 state->cmd = cmd->next;
630 if (bufp) {
631 *bufp = state->buf.buf;
632 *sizep = state->buf.len;
633 }
634 return 0;
635 }
636
637 static int run_receive_hook(struct command *commands, const char *hook_name,
638 int skip_broken)
639 {
640 struct receive_hook_feed_state state;
641 int status;
642
643 strbuf_init(&state.buf, 0);
644 state.cmd = commands;
645 state.skip_broken = skip_broken;
646 if (feed_receive_hook(&state, NULL, NULL))
647 return 0;
648 state.cmd = commands;
649 status = run_and_feed_hook(hook_name, feed_receive_hook, &state);
650 strbuf_release(&state.buf);
651 return status;
652 }
653
654 static int run_update_hook(struct command *cmd)
655 {
656 const char *argv[5];
657 struct child_process proc = CHILD_PROCESS_INIT;
658 int code;
659
660 argv[0] = find_hook("update");
661 if (!argv[0])
662 return 0;
663
664 argv[1] = cmd->ref_name;
665 argv[2] = sha1_to_hex(cmd->old_sha1);
666 argv[3] = sha1_to_hex(cmd->new_sha1);
667 argv[4] = NULL;
668
669 proc.no_stdin = 1;
670 proc.stdout_to_stderr = 1;
671 proc.err = use_sideband ? -1 : 0;
672 proc.argv = argv;
673
674 code = start_command(&proc);
675 if (code)
676 return code;
677 if (use_sideband)
678 copy_to_sideband(proc.err, -1, NULL);
679 return finish_command(&proc);
680 }
681
682 static int is_ref_checked_out(const char *ref)
683 {
684 if (is_bare_repository())
685 return 0;
686
687 if (!head_name)
688 return 0;
689 return !strcmp(head_name, ref);
690 }
691
692 static char *refuse_unconfigured_deny_msg[] = {
693 "By default, updating the current branch in a non-bare repository",
694 "is denied, because it will make the index and work tree inconsistent",
695 "with what you pushed, and will require 'git reset --hard' to match",
696 "the work tree to HEAD.",
697 "",
698 "You can set 'receive.denyCurrentBranch' configuration variable to",
699 "'ignore' or 'warn' in the remote repository to allow pushing into",
700 "its current branch; however, this is not recommended unless you",
701 "arranged to update its work tree to match what you pushed in some",
702 "other way.",
703 "",
704 "To squelch this message and still keep the default behaviour, set",
705 "'receive.denyCurrentBranch' configuration variable to 'refuse'."
706 };
707
708 static void refuse_unconfigured_deny(void)
709 {
710 int i;
711 for (i = 0; i < ARRAY_SIZE(refuse_unconfigured_deny_msg); i++)
712 rp_error("%s", refuse_unconfigured_deny_msg[i]);
713 }
714
715 static char *refuse_unconfigured_deny_delete_current_msg[] = {
716 "By default, deleting the current branch is denied, because the next",
717 "'git clone' won't result in any file checked out, causing confusion.",
718 "",
719 "You can set 'receive.denyDeleteCurrent' configuration variable to",
720 "'warn' or 'ignore' in the remote repository to allow deleting the",
721 "current branch, with or without a warning message.",
722 "",
723 "To squelch this message, you can set it to 'refuse'."
724 };
725
726 static void refuse_unconfigured_deny_delete_current(void)
727 {
728 int i;
729 for (i = 0;
730 i < ARRAY_SIZE(refuse_unconfigured_deny_delete_current_msg);
731 i++)
732 rp_error("%s", refuse_unconfigured_deny_delete_current_msg[i]);
733 }
734
735 static int command_singleton_iterator(void *cb_data, unsigned char sha1[20]);
736 static int update_shallow_ref(struct command *cmd, struct shallow_info *si)
737 {
738 static struct lock_file shallow_lock;
739 struct sha1_array extra = SHA1_ARRAY_INIT;
740 struct check_connected_options opt = CHECK_CONNECTED_INIT;
741 uint32_t mask = 1 << (cmd->index % 32);
742 int i;
743
744 trace_printf_key(&trace_shallow,
745 "shallow: update_shallow_ref %s\n", cmd->ref_name);
746 for (i = 0; i < si->shallow->nr; i++)
747 if (si->used_shallow[i] &&
748 (si->used_shallow[i][cmd->index / 32] & mask) &&
749 !delayed_reachability_test(si, i))
750 sha1_array_append(&extra, si->shallow->sha1[i]);
751
752 setup_alternate_shallow(&shallow_lock, &opt.shallow_file, &extra);
753 if (check_connected(command_singleton_iterator, cmd, &opt)) {
754 rollback_lock_file(&shallow_lock);
755 sha1_array_clear(&extra);
756 return -1;
757 }
758
759 commit_lock_file(&shallow_lock);
760
761 /*
762 * Make sure setup_alternate_shallow() for the next ref does
763 * not lose these new roots..
764 */
765 for (i = 0; i < extra.nr; i++)
766 register_shallow(extra.sha1[i]);
767
768 si->shallow_ref[cmd->index] = 0;
769 sha1_array_clear(&extra);
770 return 0;
771 }
772
773 /*
774 * NEEDSWORK: we should consolidate various implementions of "are we
775 * on an unborn branch?" test into one, and make the unified one more
776 * robust. !get_sha1() based check used here and elsewhere would not
777 * allow us to tell an unborn branch from corrupt ref, for example.
778 * For the purpose of fixing "deploy-to-update does not work when
779 * pushing into an empty repository" issue, this should suffice for
780 * now.
781 */
782 static int head_has_history(void)
783 {
784 unsigned char sha1[20];
785
786 return !get_sha1("HEAD", sha1);
787 }
788
789 static const char *push_to_deploy(unsigned char *sha1,
790 struct argv_array *env,
791 const char *work_tree)
792 {
793 const char *update_refresh[] = {
794 "update-index", "-q", "--ignore-submodules", "--refresh", NULL
795 };
796 const char *diff_files[] = {
797 "diff-files", "--quiet", "--ignore-submodules", "--", NULL
798 };
799 const char *diff_index[] = {
800 "diff-index", "--quiet", "--cached", "--ignore-submodules",
801 NULL, "--", NULL
802 };
803 const char *read_tree[] = {
804 "read-tree", "-u", "-m", NULL, NULL
805 };
806 struct child_process child = CHILD_PROCESS_INIT;
807
808 child.argv = update_refresh;
809 child.env = env->argv;
810 child.dir = work_tree;
811 child.no_stdin = 1;
812 child.stdout_to_stderr = 1;
813 child.git_cmd = 1;
814 if (run_command(&child))
815 return "Up-to-date check failed";
816
817 /* run_command() does not clean up completely; reinitialize */
818 child_process_init(&child);
819 child.argv = diff_files;
820 child.env = env->argv;
821 child.dir = work_tree;
822 child.no_stdin = 1;
823 child.stdout_to_stderr = 1;
824 child.git_cmd = 1;
825 if (run_command(&child))
826 return "Working directory has unstaged changes";
827
828 /* diff-index with either HEAD or an empty tree */
829 diff_index[4] = head_has_history() ? "HEAD" : EMPTY_TREE_SHA1_HEX;
830
831 child_process_init(&child);
832 child.argv = diff_index;
833 child.env = env->argv;
834 child.no_stdin = 1;
835 child.no_stdout = 1;
836 child.stdout_to_stderr = 0;
837 child.git_cmd = 1;
838 if (run_command(&child))
839 return "Working directory has staged changes";
840
841 read_tree[3] = sha1_to_hex(sha1);
842 child_process_init(&child);
843 child.argv = read_tree;
844 child.env = env->argv;
845 child.dir = work_tree;
846 child.no_stdin = 1;
847 child.no_stdout = 1;
848 child.stdout_to_stderr = 0;
849 child.git_cmd = 1;
850 if (run_command(&child))
851 return "Could not update working tree to new HEAD";
852
853 return NULL;
854 }
855
856 static const char *push_to_checkout_hook = "push-to-checkout";
857
858 static const char *push_to_checkout(unsigned char *sha1,
859 struct argv_array *env,
860 const char *work_tree)
861 {
862 argv_array_pushf(env, "GIT_WORK_TREE=%s", absolute_path(work_tree));
863 if (run_hook_le(env->argv, push_to_checkout_hook,
864 sha1_to_hex(sha1), NULL))
865 return "push-to-checkout hook declined";
866 else
867 return NULL;
868 }
869
870 static const char *update_worktree(unsigned char *sha1)
871 {
872 const char *retval;
873 const char *work_tree = git_work_tree_cfg ? git_work_tree_cfg : "..";
874 struct argv_array env = ARGV_ARRAY_INIT;
875
876 if (is_bare_repository())
877 return "denyCurrentBranch = updateInstead needs a worktree";
878
879 argv_array_pushf(&env, "GIT_DIR=%s", absolute_path(get_git_dir()));
880
881 if (!find_hook(push_to_checkout_hook))
882 retval = push_to_deploy(sha1, &env, work_tree);
883 else
884 retval = push_to_checkout(sha1, &env, work_tree);
885
886 argv_array_clear(&env);
887 return retval;
888 }
889
890 static const char *update(struct command *cmd, struct shallow_info *si)
891 {
892 const char *name = cmd->ref_name;
893 struct strbuf namespaced_name_buf = STRBUF_INIT;
894 const char *namespaced_name, *ret;
895 unsigned char *old_sha1 = cmd->old_sha1;
896 unsigned char *new_sha1 = cmd->new_sha1;
897
898 /* only refs/... are allowed */
899 if (!starts_with(name, "refs/") || check_refname_format(name + 5, 0)) {
900 rp_error("refusing to create funny ref '%s' remotely", name);
901 return "funny refname";
902 }
903
904 strbuf_addf(&namespaced_name_buf, "%s%s", get_git_namespace(), name);
905 namespaced_name = strbuf_detach(&namespaced_name_buf, NULL);
906
907 if (is_ref_checked_out(namespaced_name)) {
908 switch (deny_current_branch) {
909 case DENY_IGNORE:
910 break;
911 case DENY_WARN:
912 rp_warning("updating the current branch");
913 break;
914 case DENY_REFUSE:
915 case DENY_UNCONFIGURED:
916 rp_error("refusing to update checked out branch: %s", name);
917 if (deny_current_branch == DENY_UNCONFIGURED)
918 refuse_unconfigured_deny();
919 return "branch is currently checked out";
920 case DENY_UPDATE_INSTEAD:
921 ret = update_worktree(new_sha1);
922 if (ret)
923 return ret;
924 break;
925 }
926 }
927
928 if (!is_null_sha1(new_sha1) && !has_sha1_file(new_sha1)) {
929 error("unpack should have generated %s, "
930 "but I can't find it!", sha1_to_hex(new_sha1));
931 return "bad pack";
932 }
933
934 if (!is_null_sha1(old_sha1) && is_null_sha1(new_sha1)) {
935 if (deny_deletes && starts_with(name, "refs/heads/")) {
936 rp_error("denying ref deletion for %s", name);
937 return "deletion prohibited";
938 }
939
940 if (head_name && !strcmp(namespaced_name, head_name)) {
941 switch (deny_delete_current) {
942 case DENY_IGNORE:
943 break;
944 case DENY_WARN:
945 rp_warning("deleting the current branch");
946 break;
947 case DENY_REFUSE:
948 case DENY_UNCONFIGURED:
949 case DENY_UPDATE_INSTEAD:
950 if (deny_delete_current == DENY_UNCONFIGURED)
951 refuse_unconfigured_deny_delete_current();
952 rp_error("refusing to delete the current branch: %s", name);
953 return "deletion of the current branch prohibited";
954 default:
955 return "Invalid denyDeleteCurrent setting";
956 }
957 }
958 }
959
960 if (deny_non_fast_forwards && !is_null_sha1(new_sha1) &&
961 !is_null_sha1(old_sha1) &&
962 starts_with(name, "refs/heads/")) {
963 struct object *old_object, *new_object;
964 struct commit *old_commit, *new_commit;
965
966 old_object = parse_object(old_sha1);
967 new_object = parse_object(new_sha1);
968
969 if (!old_object || !new_object ||
970 old_object->type != OBJ_COMMIT ||
971 new_object->type != OBJ_COMMIT) {
972 error("bad sha1 objects for %s", name);
973 return "bad ref";
974 }
975 old_commit = (struct commit *)old_object;
976 new_commit = (struct commit *)new_object;
977 if (!in_merge_bases(old_commit, new_commit)) {
978 rp_error("denying non-fast-forward %s"
979 " (you should pull first)", name);
980 return "non-fast-forward";
981 }
982 }
983 if (run_update_hook(cmd)) {
984 rp_error("hook declined to update %s", name);
985 return "hook declined";
986 }
987
988 if (is_null_sha1(new_sha1)) {
989 struct strbuf err = STRBUF_INIT;
990 if (!parse_object(old_sha1)) {
991 old_sha1 = NULL;
992 if (ref_exists(name)) {
993 rp_warning("Allowing deletion of corrupt ref.");
994 } else {
995 rp_warning("Deleting a non-existent ref.");
996 cmd->did_not_exist = 1;
997 }
998 }
999 if (ref_transaction_delete(transaction,
1000 namespaced_name,
1001 old_sha1,
1002 0, "push", &err)) {
1003 rp_error("%s", err.buf);
1004 strbuf_release(&err);
1005 return "failed to delete";
1006 }
1007 strbuf_release(&err);
1008 return NULL; /* good */
1009 }
1010 else {
1011 struct strbuf err = STRBUF_INIT;
1012 if (shallow_update && si->shallow_ref[cmd->index] &&
1013 update_shallow_ref(cmd, si))
1014 return "shallow error";
1015
1016 if (ref_transaction_update(transaction,
1017 namespaced_name,
1018 new_sha1, old_sha1,
1019 0, "push",
1020 &err)) {
1021 rp_error("%s", err.buf);
1022 strbuf_release(&err);
1023
1024 return "failed to update ref";
1025 }
1026 strbuf_release(&err);
1027
1028 return NULL; /* good */
1029 }
1030 }
1031
1032 static void run_update_post_hook(struct command *commands)
1033 {
1034 struct command *cmd;
1035 int argc;
1036 struct child_process proc = CHILD_PROCESS_INIT;
1037 const char *hook;
1038
1039 hook = find_hook("post-update");
1040 for (argc = 0, cmd = commands; cmd; cmd = cmd->next) {
1041 if (cmd->error_string || cmd->did_not_exist)
1042 continue;
1043 argc++;
1044 }
1045 if (!argc || !hook)
1046 return;
1047
1048 argv_array_push(&proc.args, hook);
1049 for (cmd = commands; cmd; cmd = cmd->next) {
1050 if (cmd->error_string || cmd->did_not_exist)
1051 continue;
1052 argv_array_push(&proc.args, cmd->ref_name);
1053 }
1054
1055 proc.no_stdin = 1;
1056 proc.stdout_to_stderr = 1;
1057 proc.err = use_sideband ? -1 : 0;
1058
1059 if (!start_command(&proc)) {
1060 if (use_sideband)
1061 copy_to_sideband(proc.err, -1, NULL);
1062 finish_command(&proc);
1063 }
1064 }
1065
1066 static void check_aliased_update(struct command *cmd, struct string_list *list)
1067 {
1068 struct strbuf buf = STRBUF_INIT;
1069 const char *dst_name;
1070 struct string_list_item *item;
1071 struct command *dst_cmd;
1072 unsigned char sha1[GIT_SHA1_RAWSZ];
1073 char cmd_oldh[GIT_SHA1_HEXSZ + 1],
1074 cmd_newh[GIT_SHA1_HEXSZ + 1],
1075 dst_oldh[GIT_SHA1_HEXSZ + 1],
1076 dst_newh[GIT_SHA1_HEXSZ + 1];
1077 int flag;
1078
1079 strbuf_addf(&buf, "%s%s", get_git_namespace(), cmd->ref_name);
1080 dst_name = resolve_ref_unsafe(buf.buf, 0, sha1, &flag);
1081 strbuf_release(&buf);
1082
1083 if (!(flag & REF_ISSYMREF))
1084 return;
1085
1086 if (!dst_name) {
1087 rp_error("refusing update to broken symref '%s'", cmd->ref_name);
1088 cmd->skip_update = 1;
1089 cmd->error_string = "broken symref";
1090 return;
1091 }
1092 dst_name = strip_namespace(dst_name);
1093
1094 if ((item = string_list_lookup(list, dst_name)) == NULL)
1095 return;
1096
1097 cmd->skip_update = 1;
1098
1099 dst_cmd = (struct command *) item->util;
1100
1101 if (!hashcmp(cmd->old_sha1, dst_cmd->old_sha1) &&
1102 !hashcmp(cmd->new_sha1, dst_cmd->new_sha1))
1103 return;
1104
1105 dst_cmd->skip_update = 1;
1106
1107 find_unique_abbrev_r(cmd_oldh, cmd->old_sha1, DEFAULT_ABBREV);
1108 find_unique_abbrev_r(cmd_newh, cmd->new_sha1, DEFAULT_ABBREV);
1109 find_unique_abbrev_r(dst_oldh, dst_cmd->old_sha1, DEFAULT_ABBREV);
1110 find_unique_abbrev_r(dst_newh, dst_cmd->new_sha1, DEFAULT_ABBREV);
1111 rp_error("refusing inconsistent update between symref '%s' (%s..%s) and"
1112 " its target '%s' (%s..%s)",
1113 cmd->ref_name, cmd_oldh, cmd_newh,
1114 dst_cmd->ref_name, dst_oldh, dst_newh);
1115
1116 cmd->error_string = dst_cmd->error_string =
1117 "inconsistent aliased update";
1118 }
1119
1120 static void check_aliased_updates(struct command *commands)
1121 {
1122 struct command *cmd;
1123 struct string_list ref_list = STRING_LIST_INIT_NODUP;
1124
1125 for (cmd = commands; cmd; cmd = cmd->next) {
1126 struct string_list_item *item =
1127 string_list_append(&ref_list, cmd->ref_name);
1128 item->util = (void *)cmd;
1129 }
1130 string_list_sort(&ref_list);
1131
1132 for (cmd = commands; cmd; cmd = cmd->next) {
1133 if (!cmd->error_string)
1134 check_aliased_update(cmd, &ref_list);
1135 }
1136
1137 string_list_clear(&ref_list, 0);
1138 }
1139
1140 static int command_singleton_iterator(void *cb_data, unsigned char sha1[20])
1141 {
1142 struct command **cmd_list = cb_data;
1143 struct command *cmd = *cmd_list;
1144
1145 if (!cmd || is_null_sha1(cmd->new_sha1))
1146 return -1; /* end of list */
1147 *cmd_list = NULL; /* this returns only one */
1148 hashcpy(sha1, cmd->new_sha1);
1149 return 0;
1150 }
1151
1152 static void set_connectivity_errors(struct command *commands,
1153 struct shallow_info *si)
1154 {
1155 struct command *cmd;
1156
1157 for (cmd = commands; cmd; cmd = cmd->next) {
1158 struct command *singleton = cmd;
1159 if (shallow_update && si->shallow_ref[cmd->index])
1160 /* to be checked in update_shallow_ref() */
1161 continue;
1162 if (!check_connected(command_singleton_iterator, &singleton,
1163 NULL))
1164 continue;
1165 cmd->error_string = "missing necessary objects";
1166 }
1167 }
1168
1169 struct iterate_data {
1170 struct command *cmds;
1171 struct shallow_info *si;
1172 };
1173
1174 static int iterate_receive_command_list(void *cb_data, unsigned char sha1[20])
1175 {
1176 struct iterate_data *data = cb_data;
1177 struct command **cmd_list = &data->cmds;
1178 struct command *cmd = *cmd_list;
1179
1180 for (; cmd; cmd = cmd->next) {
1181 if (shallow_update && data->si->shallow_ref[cmd->index])
1182 /* to be checked in update_shallow_ref() */
1183 continue;
1184 if (!is_null_sha1(cmd->new_sha1) && !cmd->skip_update) {
1185 hashcpy(sha1, cmd->new_sha1);
1186 *cmd_list = cmd->next;
1187 return 0;
1188 }
1189 }
1190 *cmd_list = NULL;
1191 return -1; /* end of list */
1192 }
1193
1194 static void reject_updates_to_hidden(struct command *commands)
1195 {
1196 struct strbuf refname_full = STRBUF_INIT;
1197 size_t prefix_len;
1198 struct command *cmd;
1199
1200 strbuf_addstr(&refname_full, get_git_namespace());
1201 prefix_len = refname_full.len;
1202
1203 for (cmd = commands; cmd; cmd = cmd->next) {
1204 if (cmd->error_string)
1205 continue;
1206
1207 strbuf_setlen(&refname_full, prefix_len);
1208 strbuf_addstr(&refname_full, cmd->ref_name);
1209
1210 if (!ref_is_hidden(cmd->ref_name, refname_full.buf))
1211 continue;
1212 if (is_null_sha1(cmd->new_sha1))
1213 cmd->error_string = "deny deleting a hidden ref";
1214 else
1215 cmd->error_string = "deny updating a hidden ref";
1216 }
1217
1218 strbuf_release(&refname_full);
1219 }
1220
1221 static int should_process_cmd(struct command *cmd)
1222 {
1223 return !cmd->error_string && !cmd->skip_update;
1224 }
1225
1226 static void warn_if_skipped_connectivity_check(struct command *commands,
1227 struct shallow_info *si)
1228 {
1229 struct command *cmd;
1230 int checked_connectivity = 1;
1231
1232 for (cmd = commands; cmd; cmd = cmd->next) {
1233 if (should_process_cmd(cmd) && si->shallow_ref[cmd->index]) {
1234 error("BUG: connectivity check has not been run on ref %s",
1235 cmd->ref_name);
1236 checked_connectivity = 0;
1237 }
1238 }
1239 if (!checked_connectivity)
1240 die("BUG: connectivity check skipped???");
1241 }
1242
1243 static void execute_commands_non_atomic(struct command *commands,
1244 struct shallow_info *si)
1245 {
1246 struct command *cmd;
1247 struct strbuf err = STRBUF_INIT;
1248
1249 for (cmd = commands; cmd; cmd = cmd->next) {
1250 if (!should_process_cmd(cmd))
1251 continue;
1252
1253 transaction = ref_transaction_begin(&err);
1254 if (!transaction) {
1255 rp_error("%s", err.buf);
1256 strbuf_reset(&err);
1257 cmd->error_string = "transaction failed to start";
1258 continue;
1259 }
1260
1261 cmd->error_string = update(cmd, si);
1262
1263 if (!cmd->error_string
1264 && ref_transaction_commit(transaction, &err)) {
1265 rp_error("%s", err.buf);
1266 strbuf_reset(&err);
1267 cmd->error_string = "failed to update ref";
1268 }
1269 ref_transaction_free(transaction);
1270 }
1271 strbuf_release(&err);
1272 }
1273
1274 static void execute_commands_atomic(struct command *commands,
1275 struct shallow_info *si)
1276 {
1277 struct command *cmd;
1278 struct strbuf err = STRBUF_INIT;
1279 const char *reported_error = "atomic push failure";
1280
1281 transaction = ref_transaction_begin(&err);
1282 if (!transaction) {
1283 rp_error("%s", err.buf);
1284 strbuf_reset(&err);
1285 reported_error = "transaction failed to start";
1286 goto failure;
1287 }
1288
1289 for (cmd = commands; cmd; cmd = cmd->next) {
1290 if (!should_process_cmd(cmd))
1291 continue;
1292
1293 cmd->error_string = update(cmd, si);
1294
1295 if (cmd->error_string)
1296 goto failure;
1297 }
1298
1299 if (ref_transaction_commit(transaction, &err)) {
1300 rp_error("%s", err.buf);
1301 reported_error = "atomic transaction failed";
1302 goto failure;
1303 }
1304 goto cleanup;
1305
1306 failure:
1307 for (cmd = commands; cmd; cmd = cmd->next)
1308 if (!cmd->error_string)
1309 cmd->error_string = reported_error;
1310
1311 cleanup:
1312 ref_transaction_free(transaction);
1313 strbuf_release(&err);
1314 }
1315
1316 static void execute_commands(struct command *commands,
1317 const char *unpacker_error,
1318 struct shallow_info *si)
1319 {
1320 struct command *cmd;
1321 unsigned char sha1[20];
1322 struct iterate_data data;
1323
1324 if (unpacker_error) {
1325 for (cmd = commands; cmd; cmd = cmd->next)
1326 cmd->error_string = "unpacker error";
1327 return;
1328 }
1329
1330 data.cmds = commands;
1331 data.si = si;
1332 if (check_connected(iterate_receive_command_list, &data, NULL))
1333 set_connectivity_errors(commands, si);
1334
1335 reject_updates_to_hidden(commands);
1336
1337 if (run_receive_hook(commands, "pre-receive", 0)) {
1338 for (cmd = commands; cmd; cmd = cmd->next) {
1339 if (!cmd->error_string)
1340 cmd->error_string = "pre-receive hook declined";
1341 }
1342 return;
1343 }
1344
1345 check_aliased_updates(commands);
1346
1347 free(head_name_to_free);
1348 head_name = head_name_to_free = resolve_refdup("HEAD", 0, sha1, NULL);
1349
1350 if (use_atomic)
1351 execute_commands_atomic(commands, si);
1352 else
1353 execute_commands_non_atomic(commands, si);
1354
1355 if (shallow_update)
1356 warn_if_skipped_connectivity_check(commands, si);
1357 }
1358
1359 static struct command **queue_command(struct command **tail,
1360 const char *line,
1361 int linelen)
1362 {
1363 unsigned char old_sha1[20], new_sha1[20];
1364 struct command *cmd;
1365 const char *refname;
1366 int reflen;
1367
1368 if (linelen < 83 ||
1369 line[40] != ' ' ||
1370 line[81] != ' ' ||
1371 get_sha1_hex(line, old_sha1) ||
1372 get_sha1_hex(line + 41, new_sha1))
1373 die("protocol error: expected old/new/ref, got '%s'", line);
1374
1375 refname = line + 82;
1376 reflen = linelen - 82;
1377 cmd = xcalloc(1, st_add3(sizeof(struct command), reflen, 1));
1378 hashcpy(cmd->old_sha1, old_sha1);
1379 hashcpy(cmd->new_sha1, new_sha1);
1380 memcpy(cmd->ref_name, refname, reflen);
1381 cmd->ref_name[reflen] = '\0';
1382 *tail = cmd;
1383 return &cmd->next;
1384 }
1385
1386 static void queue_commands_from_cert(struct command **tail,
1387 struct strbuf *push_cert)
1388 {
1389 const char *boc, *eoc;
1390
1391 if (*tail)
1392 die("protocol error: got both push certificate and unsigned commands");
1393
1394 boc = strstr(push_cert->buf, "\n\n");
1395 if (!boc)
1396 die("malformed push certificate %.*s", 100, push_cert->buf);
1397 else
1398 boc += 2;
1399 eoc = push_cert->buf + parse_signature(push_cert->buf, push_cert->len);
1400
1401 while (boc < eoc) {
1402 const char *eol = memchr(boc, '\n', eoc - boc);
1403 tail = queue_command(tail, boc, eol ? eol - boc : eoc - eol);
1404 boc = eol ? eol + 1 : eoc;
1405 }
1406 }
1407
1408 static struct command *read_head_info(struct sha1_array *shallow)
1409 {
1410 struct command *commands = NULL;
1411 struct command **p = &commands;
1412 for (;;) {
1413 char *line;
1414 int len, linelen;
1415
1416 line = packet_read_line(0, &len);
1417 if (!line)
1418 break;
1419
1420 if (len == 48 && starts_with(line, "shallow ")) {
1421 unsigned char sha1[20];
1422 if (get_sha1_hex(line + 8, sha1))
1423 die("protocol error: expected shallow sha, got '%s'",
1424 line + 8);
1425 sha1_array_append(shallow, sha1);
1426 continue;
1427 }
1428
1429 linelen = strlen(line);
1430 if (linelen < len) {
1431 const char *feature_list = line + linelen + 1;
1432 if (parse_feature_request(feature_list, "report-status"))
1433 report_status = 1;
1434 if (parse_feature_request(feature_list, "side-band-64k"))
1435 use_sideband = LARGE_PACKET_MAX;
1436 if (parse_feature_request(feature_list, "quiet"))
1437 quiet = 1;
1438 if (advertise_atomic_push
1439 && parse_feature_request(feature_list, "atomic"))
1440 use_atomic = 1;
1441 }
1442
1443 if (!strcmp(line, "push-cert")) {
1444 int true_flush = 0;
1445 char certbuf[1024];
1446
1447 for (;;) {
1448 len = packet_read(0, NULL, NULL,
1449 certbuf, sizeof(certbuf), 0);
1450 if (!len) {
1451 true_flush = 1;
1452 break;
1453 }
1454 if (!strcmp(certbuf, "push-cert-end\n"))
1455 break; /* end of cert */
1456 strbuf_addstr(&push_cert, certbuf);
1457 }
1458
1459 if (true_flush)
1460 break;
1461 continue;
1462 }
1463
1464 p = queue_command(p, line, linelen);
1465 }
1466
1467 if (push_cert.len)
1468 queue_commands_from_cert(p, &push_cert);
1469
1470 return commands;
1471 }
1472
1473 static const char *parse_pack_header(struct pack_header *hdr)
1474 {
1475 switch (read_pack_header(0, hdr)) {
1476 case PH_ERROR_EOF:
1477 return "eof before pack header was fully read";
1478
1479 case PH_ERROR_PACK_SIGNATURE:
1480 return "protocol error (pack signature mismatch detected)";
1481
1482 case PH_ERROR_PROTOCOL:
1483 return "protocol error (pack version unsupported)";
1484
1485 default:
1486 return "unknown error in parse_pack_header";
1487
1488 case 0:
1489 return NULL;
1490 }
1491 }
1492
1493 static const char *pack_lockfile;
1494
1495 static const char *unpack(int err_fd, struct shallow_info *si)
1496 {
1497 struct pack_header hdr;
1498 const char *hdr_err;
1499 int status;
1500 char hdr_arg[38];
1501 struct child_process child = CHILD_PROCESS_INIT;
1502 int fsck_objects = (receive_fsck_objects >= 0
1503 ? receive_fsck_objects
1504 : transfer_fsck_objects >= 0
1505 ? transfer_fsck_objects
1506 : 0);
1507
1508 hdr_err = parse_pack_header(&hdr);
1509 if (hdr_err) {
1510 if (err_fd > 0)
1511 close(err_fd);
1512 return hdr_err;
1513 }
1514 snprintf(hdr_arg, sizeof(hdr_arg),
1515 "--pack_header=%"PRIu32",%"PRIu32,
1516 ntohl(hdr.hdr_version), ntohl(hdr.hdr_entries));
1517
1518 if (si->nr_ours || si->nr_theirs) {
1519 alt_shallow_file = setup_temporary_shallow(si->shallow);
1520 argv_array_push(&child.args, "--shallow-file");
1521 argv_array_push(&child.args, alt_shallow_file);
1522 }
1523
1524 if (ntohl(hdr.hdr_entries) < unpack_limit) {
1525 argv_array_pushl(&child.args, "unpack-objects", hdr_arg, NULL);
1526 if (quiet)
1527 argv_array_push(&child.args, "-q");
1528 if (fsck_objects)
1529 argv_array_pushf(&child.args, "--strict%s",
1530 fsck_msg_types.buf);
1531 child.no_stdout = 1;
1532 child.err = err_fd;
1533 child.git_cmd = 1;
1534 status = run_command(&child);
1535 if (status)
1536 return "unpack-objects abnormal exit";
1537 } else {
1538 char hostname[256];
1539
1540 argv_array_pushl(&child.args, "index-pack",
1541 "--stdin", hdr_arg, NULL);
1542
1543 if (gethostname(hostname, sizeof(hostname)))
1544 xsnprintf(hostname, sizeof(hostname), "localhost");
1545 argv_array_pushf(&child.args,
1546 "--keep=receive-pack %"PRIuMAX" on %s",
1547 (uintmax_t)getpid(),
1548 hostname);
1549
1550 if (fsck_objects)
1551 argv_array_pushf(&child.args, "--strict%s",
1552 fsck_msg_types.buf);
1553 if (!reject_thin)
1554 argv_array_push(&child.args, "--fix-thin");
1555 child.out = -1;
1556 child.err = err_fd;
1557 child.git_cmd = 1;
1558 status = start_command(&child);
1559 if (status)
1560 return "index-pack fork failed";
1561 pack_lockfile = index_pack_lockfile(child.out);
1562 close(child.out);
1563 status = finish_command(&child);
1564 if (status)
1565 return "index-pack abnormal exit";
1566 reprepare_packed_git();
1567 }
1568 return NULL;
1569 }
1570
1571 static const char *unpack_with_sideband(struct shallow_info *si)
1572 {
1573 struct async muxer;
1574 const char *ret;
1575
1576 if (!use_sideband)
1577 return unpack(0, si);
1578
1579 memset(&muxer, 0, sizeof(muxer));
1580 muxer.proc = copy_to_sideband;
1581 muxer.in = -1;
1582 if (start_async(&muxer))
1583 return NULL;
1584
1585 ret = unpack(muxer.in, si);
1586
1587 finish_async(&muxer);
1588 return ret;
1589 }
1590
1591 static void prepare_shallow_update(struct command *commands,
1592 struct shallow_info *si)
1593 {
1594 int i, j, k, bitmap_size = (si->ref->nr + 31) / 32;
1595
1596 ALLOC_ARRAY(si->used_shallow, si->shallow->nr);
1597 assign_shallow_commits_to_refs(si, si->used_shallow, NULL);
1598
1599 si->need_reachability_test =
1600 xcalloc(si->shallow->nr, sizeof(*si->need_reachability_test));
1601 si->reachable =
1602 xcalloc(si->shallow->nr, sizeof(*si->reachable));
1603 si->shallow_ref = xcalloc(si->ref->nr, sizeof(*si->shallow_ref));
1604
1605 for (i = 0; i < si->nr_ours; i++)
1606 si->need_reachability_test[si->ours[i]] = 1;
1607
1608 for (i = 0; i < si->shallow->nr; i++) {
1609 if (!si->used_shallow[i])
1610 continue;
1611 for (j = 0; j < bitmap_size; j++) {
1612 if (!si->used_shallow[i][j])
1613 continue;
1614 si->need_reachability_test[i]++;
1615 for (k = 0; k < 32; k++)
1616 if (si->used_shallow[i][j] & (1U << k))
1617 si->shallow_ref[j * 32 + k]++;
1618 }
1619
1620 /*
1621 * true for those associated with some refs and belong
1622 * in "ours" list aka "step 7 not done yet"
1623 */
1624 si->need_reachability_test[i] =
1625 si->need_reachability_test[i] > 1;
1626 }
1627
1628 /*
1629 * keep hooks happy by forcing a temporary shallow file via
1630 * env variable because we can't add --shallow-file to every
1631 * command. check_connected() will be done with
1632 * true .git/shallow though.
1633 */
1634 setenv(GIT_SHALLOW_FILE_ENVIRONMENT, alt_shallow_file, 1);
1635 }
1636
1637 static void update_shallow_info(struct command *commands,
1638 struct shallow_info *si,
1639 struct sha1_array *ref)
1640 {
1641 struct command *cmd;
1642 int *ref_status;
1643 remove_nonexistent_theirs_shallow(si);
1644 if (!si->nr_ours && !si->nr_theirs) {
1645 shallow_update = 0;
1646 return;
1647 }
1648
1649 for (cmd = commands; cmd; cmd = cmd->next) {
1650 if (is_null_sha1(cmd->new_sha1))
1651 continue;
1652 sha1_array_append(ref, cmd->new_sha1);
1653 cmd->index = ref->nr - 1;
1654 }
1655 si->ref = ref;
1656
1657 if (shallow_update) {
1658 prepare_shallow_update(commands, si);
1659 return;
1660 }
1661
1662 ALLOC_ARRAY(ref_status, ref->nr);
1663 assign_shallow_commits_to_refs(si, NULL, ref_status);
1664 for (cmd = commands; cmd; cmd = cmd->next) {
1665 if (is_null_sha1(cmd->new_sha1))
1666 continue;
1667 if (ref_status[cmd->index]) {
1668 cmd->error_string = "shallow update not allowed";
1669 cmd->skip_update = 1;
1670 }
1671 }
1672 free(ref_status);
1673 }
1674
1675 static void report(struct command *commands, const char *unpack_status)
1676 {
1677 struct command *cmd;
1678 struct strbuf buf = STRBUF_INIT;
1679
1680 packet_buf_write(&buf, "unpack %s\n",
1681 unpack_status ? unpack_status : "ok");
1682 for (cmd = commands; cmd; cmd = cmd->next) {
1683 if (!cmd->error_string)
1684 packet_buf_write(&buf, "ok %s\n",
1685 cmd->ref_name);
1686 else
1687 packet_buf_write(&buf, "ng %s %s\n",
1688 cmd->ref_name, cmd->error_string);
1689 }
1690 packet_buf_flush(&buf);
1691
1692 if (use_sideband)
1693 send_sideband(1, 1, buf.buf, buf.len, use_sideband);
1694 else
1695 write_or_die(1, buf.buf, buf.len);
1696 strbuf_release(&buf);
1697 }
1698
1699 static int delete_only(struct command *commands)
1700 {
1701 struct command *cmd;
1702 for (cmd = commands; cmd; cmd = cmd->next) {
1703 if (!is_null_sha1(cmd->new_sha1))
1704 return 0;
1705 }
1706 return 1;
1707 }
1708
1709 int cmd_receive_pack(int argc, const char **argv, const char *prefix)
1710 {
1711 int advertise_refs = 0;
1712 struct command *commands;
1713 struct sha1_array shallow = SHA1_ARRAY_INIT;
1714 struct sha1_array ref = SHA1_ARRAY_INIT;
1715 struct shallow_info si;
1716
1717 struct option options[] = {
1718 OPT__QUIET(&quiet, N_("quiet")),
1719 OPT_HIDDEN_BOOL(0, "stateless-rpc", &stateless_rpc, NULL),
1720 OPT_HIDDEN_BOOL(0, "advertise-refs", &advertise_refs, NULL),
1721 OPT_HIDDEN_BOOL(0, "reject-thin-pack-for-testing", &reject_thin, NULL),
1722 OPT_END()
1723 };
1724
1725 packet_trace_identity("receive-pack");
1726
1727 argc = parse_options(argc, argv, prefix, options, receive_pack_usage, 0);
1728
1729 if (argc > 1)
1730 usage_msg_opt(_("Too many arguments."), receive_pack_usage, options);
1731 if (argc == 0)
1732 usage_msg_opt(_("You must specify a directory."), receive_pack_usage, options);
1733
1734 service_dir = argv[0];
1735
1736 setup_path();
1737
1738 if (!enter_repo(service_dir, 0))
1739 die("'%s' does not appear to be a git repository", service_dir);
1740
1741 git_config(receive_pack_config, NULL);
1742 if (cert_nonce_seed)
1743 push_cert_nonce = prepare_push_cert_nonce(service_dir, time(NULL));
1744
1745 if (0 <= transfer_unpack_limit)
1746 unpack_limit = transfer_unpack_limit;
1747 else if (0 <= receive_unpack_limit)
1748 unpack_limit = receive_unpack_limit;
1749
1750 if (advertise_refs || !stateless_rpc) {
1751 write_head_info();
1752 }
1753 if (advertise_refs)
1754 return 0;
1755
1756 if ((commands = read_head_info(&shallow)) != NULL) {
1757 const char *unpack_status = NULL;
1758
1759 prepare_shallow_info(&si, &shallow);
1760 if (!si.nr_ours && !si.nr_theirs)
1761 shallow_update = 0;
1762 if (!delete_only(commands)) {
1763 unpack_status = unpack_with_sideband(&si);
1764 update_shallow_info(commands, &si, &ref);
1765 }
1766 execute_commands(commands, unpack_status, &si);
1767 if (pack_lockfile)
1768 unlink_or_warn(pack_lockfile);
1769 if (report_status)
1770 report(commands, unpack_status);
1771 run_receive_hook(commands, "post-receive", 1);
1772 run_update_post_hook(commands);
1773 if (auto_gc) {
1774 const char *argv_gc_auto[] = {
1775 "gc", "--auto", "--quiet", NULL,
1776 };
1777 struct child_process proc = CHILD_PROCESS_INIT;
1778
1779 proc.no_stdin = 1;
1780 proc.stdout_to_stderr = 1;
1781 proc.err = use_sideband ? -1 : 0;
1782 proc.git_cmd = 1;
1783 proc.argv = argv_gc_auto;
1784
1785 close_all_packs();
1786 if (!start_command(&proc)) {
1787 if (use_sideband)
1788 copy_to_sideband(proc.err, -1, NULL);
1789 finish_command(&proc);
1790 }
1791 }
1792 if (auto_update_server_info)
1793 update_server_info(0);
1794 clear_shallow_info(&si);
1795 }
1796 if (use_sideband)
1797 packet_flush(1);
1798 sha1_array_clear(&shallow);
1799 sha1_array_clear(&ref);
1800 free((void *)push_cert_nonce);
1801 return 0;
1802 }
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