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Doc/checkout: checking out using @{-N} can lead to detached state
[git/debian.git] / builtin / receive-pack.c
blobb618d52139beccafdb77cc4eed4d3fc121b4124a
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 #include "tmp-objdir.h"
24
25 static const char * const receive_pack_usage[] = {
26 N_("git receive-pack <git-dir>"),
27 NULL
28 };
29
30 enum deny_action {
31 DENY_UNCONFIGURED,
32 DENY_IGNORE,
33 DENY_WARN,
34 DENY_REFUSE,
35 DENY_UPDATE_INSTEAD
36 };
37
38 static int deny_deletes;
39 static int deny_non_fast_forwards;
40 static enum deny_action deny_current_branch = DENY_UNCONFIGURED;
41 static enum deny_action deny_delete_current = DENY_UNCONFIGURED;
42 static int receive_fsck_objects = -1;
43 static int transfer_fsck_objects = -1;
44 static struct strbuf fsck_msg_types = STRBUF_INIT;
45 static int receive_unpack_limit = -1;
46 static int transfer_unpack_limit = -1;
47 static int advertise_atomic_push = 1;
48 static int advertise_push_options;
49 static int unpack_limit = 100;
50 static off_t max_input_size;
51 static int report_status;
52 static int use_sideband;
53 static int use_atomic;
54 static int use_push_options;
55 static int quiet;
56 static int prefer_ofs_delta = 1;
57 static int auto_update_server_info;
58 static int auto_gc = 1;
59 static int reject_thin;
60 static int stateless_rpc;
61 static const char *service_dir;
62 static const char *head_name;
63 static void *head_name_to_free;
64 static int sent_capabilities;
65 static int shallow_update;
66 static const char *alt_shallow_file;
67 static struct strbuf push_cert = STRBUF_INIT;
68 static unsigned char push_cert_sha1[20];
69 static struct signature_check sigcheck;
70 static const char *push_cert_nonce;
71 static const char *cert_nonce_seed;
72
73 static const char *NONCE_UNSOLICITED = "UNSOLICITED";
74 static const char *NONCE_BAD = "BAD";
75 static const char *NONCE_MISSING = "MISSING";
76 static const char *NONCE_OK = "OK";
77 static const char *NONCE_SLOP = "SLOP";
78 static const char *nonce_status;
79 static long nonce_stamp_slop;
80 static unsigned long nonce_stamp_slop_limit;
81 static struct ref_transaction *transaction;
82
83 static enum {
84 KEEPALIVE_NEVER = 0,
85 KEEPALIVE_AFTER_NUL,
86 KEEPALIVE_ALWAYS
87 } use_keepalive;
88 static int keepalive_in_sec = 5;
89
90 static struct tmp_objdir *tmp_objdir;
91
92 static enum deny_action parse_deny_action(const char *var, const char *value)
93 {
94 if (value) {
95 if (!strcasecmp(value, "ignore"))
96 return DENY_IGNORE;
97 if (!strcasecmp(value, "warn"))
98 return DENY_WARN;
99 if (!strcasecmp(value, "refuse"))
100 return DENY_REFUSE;
101 if (!strcasecmp(value, "updateinstead"))
102 return DENY_UPDATE_INSTEAD;
103 }
104 if (git_config_bool(var, value))
105 return DENY_REFUSE;
106 return DENY_IGNORE;
107 }
108
109 static int receive_pack_config(const char *var, const char *value, void *cb)
110 {
111 int status = parse_hide_refs_config(var, value, "receive");
112
113 if (status)
114 return status;
115
116 if (strcmp(var, "receive.denydeletes") == 0) {
117 deny_deletes = git_config_bool(var, value);
118 return 0;
119 }
120
121 if (strcmp(var, "receive.denynonfastforwards") == 0) {
122 deny_non_fast_forwards = git_config_bool(var, value);
123 return 0;
124 }
125
126 if (strcmp(var, "receive.unpacklimit") == 0) {
127 receive_unpack_limit = git_config_int(var, value);
128 return 0;
129 }
130
131 if (strcmp(var, "transfer.unpacklimit") == 0) {
132 transfer_unpack_limit = git_config_int(var, value);
133 return 0;
134 }
135
136 if (strcmp(var, "receive.fsck.skiplist") == 0) {
137 const char *path;
138
139 if (git_config_pathname(&path, var, value))
140 return 1;
141 strbuf_addf(&fsck_msg_types, "%cskiplist=%s",
142 fsck_msg_types.len ? ',' : '=', path);
143 free((char *)path);
144 return 0;
145 }
146
147 if (skip_prefix(var, "receive.fsck.", &var)) {
148 if (is_valid_msg_type(var, value))
149 strbuf_addf(&fsck_msg_types, "%c%s=%s",
150 fsck_msg_types.len ? ',' : '=', var, value);
151 else
152 warning("Skipping unknown msg id '%s'", var);
153 return 0;
154 }
155
156 if (strcmp(var, "receive.fsckobjects") == 0) {
157 receive_fsck_objects = git_config_bool(var, value);
158 return 0;
159 }
160
161 if (strcmp(var, "transfer.fsckobjects") == 0) {
162 transfer_fsck_objects = git_config_bool(var, value);
163 return 0;
164 }
165
166 if (!strcmp(var, "receive.denycurrentbranch")) {
167 deny_current_branch = parse_deny_action(var, value);
168 return 0;
169 }
170
171 if (strcmp(var, "receive.denydeletecurrent") == 0) {
172 deny_delete_current = parse_deny_action(var, value);
173 return 0;
174 }
175
176 if (strcmp(var, "repack.usedeltabaseoffset") == 0) {
177 prefer_ofs_delta = git_config_bool(var, value);
178 return 0;
179 }
180
181 if (strcmp(var, "receive.updateserverinfo") == 0) {
182 auto_update_server_info = git_config_bool(var, value);
183 return 0;
184 }
185
186 if (strcmp(var, "receive.autogc") == 0) {
187 auto_gc = git_config_bool(var, value);
188 return 0;
189 }
190
191 if (strcmp(var, "receive.shallowupdate") == 0) {
192 shallow_update = git_config_bool(var, value);
193 return 0;
194 }
195
196 if (strcmp(var, "receive.certnonceseed") == 0)
197 return git_config_string(&cert_nonce_seed, var, value);
198
199 if (strcmp(var, "receive.certnonceslop") == 0) {
200 nonce_stamp_slop_limit = git_config_ulong(var, value);
201 return 0;
202 }
203
204 if (strcmp(var, "receive.advertiseatomic") == 0) {
205 advertise_atomic_push = git_config_bool(var, value);
206 return 0;
207 }
208
209 if (strcmp(var, "receive.advertisepushoptions") == 0) {
210 advertise_push_options = git_config_bool(var, value);
211 return 0;
212 }
213
214 if (strcmp(var, "receive.keepalive") == 0) {
215 keepalive_in_sec = git_config_int(var, value);
216 return 0;
217 }
218
219 if (strcmp(var, "receive.maxinputsize") == 0) {
220 max_input_size = git_config_int64(var, value);
221 return 0;
222 }
223
224 return git_default_config(var, value, cb);
225 }
226
227 static void show_ref(const char *path, const unsigned char *sha1)
228 {
229 if (sent_capabilities) {
230 packet_write_fmt(1, "%s %s\n", sha1_to_hex(sha1), path);
231 } else {
232 struct strbuf cap = STRBUF_INIT;
233
234 strbuf_addstr(&cap,
235 "report-status delete-refs side-band-64k quiet");
236 if (advertise_atomic_push)
237 strbuf_addstr(&cap, " atomic");
238 if (prefer_ofs_delta)
239 strbuf_addstr(&cap, " ofs-delta");
240 if (push_cert_nonce)
241 strbuf_addf(&cap, " push-cert=%s", push_cert_nonce);
242 if (advertise_push_options)
243 strbuf_addstr(&cap, " push-options");
244 strbuf_addf(&cap, " agent=%s", git_user_agent_sanitized());
245 packet_write_fmt(1, "%s %s%c%s\n",
246 sha1_to_hex(sha1), path, 0, cap.buf);
247 strbuf_release(&cap);
248 sent_capabilities = 1;
249 }
250 }
251
252 static int show_ref_cb(const char *path_full, const struct object_id *oid,
253 int flag, void *unused)
254 {
255 const char *path = strip_namespace(path_full);
256
257 if (ref_is_hidden(path, path_full))
258 return 0;
259
260 /*
261 * Advertise refs outside our current namespace as ".have"
262 * refs, so that the client can use them to minimize data
263 * transfer but will otherwise ignore them. This happens to
264 * cover ".have" that are thrown in by add_one_alternate_ref()
265 * to mark histories that are complete in our alternates as
266 * well.
267 */
268 if (!path)
269 path = ".have";
270 show_ref(path, oid->hash);
271 return 0;
272 }
273
274 static int show_one_alternate_sha1(const unsigned char sha1[20], void *unused)
275 {
276 show_ref(".have", sha1);
277 return 0;
278 }
279
280 static void collect_one_alternate_ref(const struct ref *ref, void *data)
281 {
282 struct sha1_array *sa = data;
283 sha1_array_append(sa, ref->old_oid.hash);
284 }
285
286 static void write_head_info(void)
287 {
288 struct sha1_array sa = SHA1_ARRAY_INIT;
289
290 for_each_alternate_ref(collect_one_alternate_ref, &sa);
291 sha1_array_for_each_unique(&sa, show_one_alternate_sha1, NULL);
292 sha1_array_clear(&sa);
293 for_each_ref(show_ref_cb, NULL);
294 if (!sent_capabilities)
295 show_ref("capabilities^{}", null_sha1);
296
297 advertise_shallow_grafts(1);
298
299 /* EOF */
300 packet_flush(1);
301 }
302
303 struct command {
304 struct command *next;
305 const char *error_string;
306 unsigned int skip_update:1,
307 did_not_exist:1;
308 int index;
309 unsigned char old_sha1[20];
310 unsigned char new_sha1[20];
311 char ref_name[FLEX_ARRAY]; /* more */
312 };
313
314 static void rp_error(const char *err, ...) __attribute__((format (printf, 1, 2)));
315 static void rp_warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
316
317 static void report_message(const char *prefix, const char *err, va_list params)
318 {
319 int sz;
320 char msg[4096];
321
322 sz = xsnprintf(msg, sizeof(msg), "%s", prefix);
323 sz += vsnprintf(msg + sz, sizeof(msg) - sz, err, params);
324 if (sz > (sizeof(msg) - 1))
325 sz = sizeof(msg) - 1;
326 msg[sz++] = '\n';
327
328 if (use_sideband)
329 send_sideband(1, 2, msg, sz, use_sideband);
330 else
331 xwrite(2, msg, sz);
332 }
333
334 static void rp_warning(const char *err, ...)
335 {
336 va_list params;
337 va_start(params, err);
338 report_message("warning: ", err, params);
339 va_end(params);
340 }
341
342 static void rp_error(const char *err, ...)
343 {
344 va_list params;
345 va_start(params, err);
346 report_message("error: ", err, params);
347 va_end(params);
348 }
349
350 static int copy_to_sideband(int in, int out, void *arg)
351 {
352 char data[128];
353 int keepalive_active = 0;
354
355 if (keepalive_in_sec <= 0)
356 use_keepalive = KEEPALIVE_NEVER;
357 if (use_keepalive == KEEPALIVE_ALWAYS)
358 keepalive_active = 1;
359
360 while (1) {
361 ssize_t sz;
362
363 if (keepalive_active) {
364 struct pollfd pfd;
365 int ret;
366
367 pfd.fd = in;
368 pfd.events = POLLIN;
369 ret = poll(&pfd, 1, 1000 * keepalive_in_sec);
370
371 if (ret < 0) {
372 if (errno == EINTR)
373 continue;
374 else
375 break;
376 } else if (ret == 0) {
377 /* no data; send a keepalive packet */
378 static const char buf[] = "0005\1";
379 write_or_die(1, buf, sizeof(buf) - 1);
380 continue;
381 } /* else there is actual data to read */
382 }
383
384 sz = xread(in, data, sizeof(data));
385 if (sz <= 0)
386 break;
387
388 if (use_keepalive == KEEPALIVE_AFTER_NUL && !keepalive_active) {
389 const char *p = memchr(data, '\0', sz);
390 if (p) {
391 /*
392 * The NUL tells us to start sending keepalives. Make
393 * sure we send any other data we read along
394 * with it.
395 */
396 keepalive_active = 1;
397 send_sideband(1, 2, data, p - data, use_sideband);
398 send_sideband(1, 2, p + 1, sz - (p - data + 1), use_sideband);
399 continue;
400 }
401 }
402
403 /*
404 * Either we're not looking for a NUL signal, or we didn't see
405 * it yet; just pass along the data.
406 */
407 send_sideband(1, 2, data, sz, use_sideband);
408 }
409 close(in);
410 return 0;
411 }
412
413 #define HMAC_BLOCK_SIZE 64
414
415 static void hmac_sha1(unsigned char *out,
416 const char *key_in, size_t key_len,
417 const char *text, size_t text_len)
418 {
419 unsigned char key[HMAC_BLOCK_SIZE];
420 unsigned char k_ipad[HMAC_BLOCK_SIZE];
421 unsigned char k_opad[HMAC_BLOCK_SIZE];
422 int i;
423 git_SHA_CTX ctx;
424
425 /* RFC 2104 2. (1) */
426 memset(key, '\0', HMAC_BLOCK_SIZE);
427 if (HMAC_BLOCK_SIZE < key_len) {
428 git_SHA1_Init(&ctx);
429 git_SHA1_Update(&ctx, key_in, key_len);
430 git_SHA1_Final(key, &ctx);
431 } else {
432 memcpy(key, key_in, key_len);
433 }
434
435 /* RFC 2104 2. (2) & (5) */
436 for (i = 0; i < sizeof(key); i++) {
437 k_ipad[i] = key[i] ^ 0x36;
438 k_opad[i] = key[i] ^ 0x5c;
439 }
440
441 /* RFC 2104 2. (3) & (4) */
442 git_SHA1_Init(&ctx);
443 git_SHA1_Update(&ctx, k_ipad, sizeof(k_ipad));
444 git_SHA1_Update(&ctx, text, text_len);
445 git_SHA1_Final(out, &ctx);
446
447 /* RFC 2104 2. (6) & (7) */
448 git_SHA1_Init(&ctx);
449 git_SHA1_Update(&ctx, k_opad, sizeof(k_opad));
450 git_SHA1_Update(&ctx, out, 20);
451 git_SHA1_Final(out, &ctx);
452 }
453
454 static char *prepare_push_cert_nonce(const char *path, unsigned long stamp)
455 {
456 struct strbuf buf = STRBUF_INIT;
457 unsigned char sha1[20];
458
459 strbuf_addf(&buf, "%s:%lu", path, stamp);
460 hmac_sha1(sha1, buf.buf, buf.len, cert_nonce_seed, strlen(cert_nonce_seed));;
461 strbuf_release(&buf);
462
463 /* RFC 2104 5. HMAC-SHA1-80 */
464 strbuf_addf(&buf, "%lu-%.*s", stamp, 20, sha1_to_hex(sha1));
465 return strbuf_detach(&buf, NULL);
466 }
467
468 /*
469 * NEEDSWORK: reuse find_commit_header() from jk/commit-author-parsing
470 * after dropping "_commit" from its name and possibly moving it out
471 * of commit.c
472 */
473 static char *find_header(const char *msg, size_t len, const char *key)
474 {
475 int key_len = strlen(key);
476 const char *line = msg;
477
478 while (line && line < msg + len) {
479 const char *eol = strchrnul(line, '\n');
480
481 if ((msg + len <= eol) || line == eol)
482 return NULL;
483 if (line + key_len < eol &&
484 !memcmp(line, key, key_len) && line[key_len] == ' ') {
485 int offset = key_len + 1;
486 return xmemdupz(line + offset, (eol - line) - offset);
487 }
488 line = *eol ? eol + 1 : NULL;
489 }
490 return NULL;
491 }
492
493 static const char *check_nonce(const char *buf, size_t len)
494 {
495 char *nonce = find_header(buf, len, "nonce");
496 unsigned long stamp, ostamp;
497 char *bohmac, *expect = NULL;
498 const char *retval = NONCE_BAD;
499
500 if (!nonce) {
501 retval = NONCE_MISSING;
502 goto leave;
503 } else if (!push_cert_nonce) {
504 retval = NONCE_UNSOLICITED;
505 goto leave;
506 } else if (!strcmp(push_cert_nonce, nonce)) {
507 retval = NONCE_OK;
508 goto leave;
509 }
510
511 if (!stateless_rpc) {
512 /* returned nonce MUST match what we gave out earlier */
513 retval = NONCE_BAD;
514 goto leave;
515 }
516
517 /*
518 * In stateless mode, we may be receiving a nonce issued by
519 * another instance of the server that serving the same
520 * repository, and the timestamps may not match, but the
521 * nonce-seed and dir should match, so we can recompute and
522 * report the time slop.
523 *
524 * In addition, when a nonce issued by another instance has
525 * timestamp within receive.certnonceslop seconds, we pretend
526 * as if we issued that nonce when reporting to the hook.
527 */
528
529 /* nonce is concat(<seconds-since-epoch>, "-", <hmac>) */
530 if (*nonce <= '0' || '9' < *nonce) {
531 retval = NONCE_BAD;
532 goto leave;
533 }
534 stamp = strtoul(nonce, &bohmac, 10);
535 if (bohmac == nonce || bohmac[0] != '-') {
536 retval = NONCE_BAD;
537 goto leave;
538 }
539
540 expect = prepare_push_cert_nonce(service_dir, stamp);
541 if (strcmp(expect, nonce)) {
542 /* Not what we would have signed earlier */
543 retval = NONCE_BAD;
544 goto leave;
545 }
546
547 /*
548 * By how many seconds is this nonce stale? Negative value
549 * would mean it was issued by another server with its clock
550 * skewed in the future.
551 */
552 ostamp = strtoul(push_cert_nonce, NULL, 10);
553 nonce_stamp_slop = (long)ostamp - (long)stamp;
554
555 if (nonce_stamp_slop_limit &&
556 labs(nonce_stamp_slop) <= nonce_stamp_slop_limit) {
557 /*
558 * Pretend as if the received nonce (which passes the
559 * HMAC check, so it is not a forged by third-party)
560 * is what we issued.
561 */
562 free((void *)push_cert_nonce);
563 push_cert_nonce = xstrdup(nonce);
564 retval = NONCE_OK;
565 } else {
566 retval = NONCE_SLOP;
567 }
568
569 leave:
570 free(nonce);
571 free(expect);
572 return retval;
573 }
574
575 static void prepare_push_cert_sha1(struct child_process *proc)
576 {
577 static int already_done;
578
579 if (!push_cert.len)
580 return;
581
582 if (!already_done) {
583 struct strbuf gpg_output = STRBUF_INIT;
584 struct strbuf gpg_status = STRBUF_INIT;
585 int bogs /* beginning_of_gpg_sig */;
586
587 already_done = 1;
588 if (write_sha1_file(push_cert.buf, push_cert.len, "blob", push_cert_sha1))
589 hashclr(push_cert_sha1);
590
591 memset(&sigcheck, '\0', sizeof(sigcheck));
592 sigcheck.result = 'N';
593
594 bogs = parse_signature(push_cert.buf, push_cert.len);
595 if (verify_signed_buffer(push_cert.buf, bogs,
596 push_cert.buf + bogs, push_cert.len - bogs,
597 &gpg_output, &gpg_status) < 0) {
598 ; /* error running gpg */
599 } else {
600 sigcheck.payload = push_cert.buf;
601 sigcheck.gpg_output = gpg_output.buf;
602 sigcheck.gpg_status = gpg_status.buf;
603 parse_gpg_output(&sigcheck);
604 }
605
606 strbuf_release(&gpg_output);
607 strbuf_release(&gpg_status);
608 nonce_status = check_nonce(push_cert.buf, bogs);
609 }
610 if (!is_null_sha1(push_cert_sha1)) {
611 argv_array_pushf(&proc->env_array, "GIT_PUSH_CERT=%s",
612 sha1_to_hex(push_cert_sha1));
613 argv_array_pushf(&proc->env_array, "GIT_PUSH_CERT_SIGNER=%s",
614 sigcheck.signer ? sigcheck.signer : "");
615 argv_array_pushf(&proc->env_array, "GIT_PUSH_CERT_KEY=%s",
616 sigcheck.key ? sigcheck.key : "");
617 argv_array_pushf(&proc->env_array, "GIT_PUSH_CERT_STATUS=%c",
618 sigcheck.result);
619 if (push_cert_nonce) {
620 argv_array_pushf(&proc->env_array,
621 "GIT_PUSH_CERT_NONCE=%s",
622 push_cert_nonce);
623 argv_array_pushf(&proc->env_array,
624 "GIT_PUSH_CERT_NONCE_STATUS=%s",
625 nonce_status);
626 if (nonce_status == NONCE_SLOP)
627 argv_array_pushf(&proc->env_array,
628 "GIT_PUSH_CERT_NONCE_SLOP=%ld",
629 nonce_stamp_slop);
630 }
631 }
632 }
633
634 struct receive_hook_feed_state {
635 struct command *cmd;
636 int skip_broken;
637 struct strbuf buf;
638 const struct string_list *push_options;
639 };
640
641 typedef int (*feed_fn)(void *, const char **, size_t *);
642 static int run_and_feed_hook(const char *hook_name, feed_fn feed,
643 struct receive_hook_feed_state *feed_state)
644 {
645 struct child_process proc = CHILD_PROCESS_INIT;
646 struct async muxer;
647 const char *argv[2];
648 int code;
649
650 argv[0] = find_hook(hook_name);
651 if (!argv[0])
652 return 0;
653
654 argv[1] = NULL;
655
656 proc.argv = argv;
657 proc.in = -1;
658 proc.stdout_to_stderr = 1;
659 if (feed_state->push_options) {
660 int i;
661 for (i = 0; i < feed_state->push_options->nr; i++)
662 argv_array_pushf(&proc.env_array,
663 "GIT_PUSH_OPTION_%d=%s", i,
664 feed_state->push_options->items[i].string);
665 argv_array_pushf(&proc.env_array, "GIT_PUSH_OPTION_COUNT=%d",
666 feed_state->push_options->nr);
667 } else
668 argv_array_pushf(&proc.env_array, "GIT_PUSH_OPTION_COUNT");
669
670 if (tmp_objdir)
671 argv_array_pushv(&proc.env_array, tmp_objdir_env(tmp_objdir));
672
673 if (use_sideband) {
674 memset(&muxer, 0, sizeof(muxer));
675 muxer.proc = copy_to_sideband;
676 muxer.in = -1;
677 code = start_async(&muxer);
678 if (code)
679 return code;
680 proc.err = muxer.in;
681 }
682
683 prepare_push_cert_sha1(&proc);
684
685 code = start_command(&proc);
686 if (code) {
687 if (use_sideband)
688 finish_async(&muxer);
689 return code;
690 }
691
692 sigchain_push(SIGPIPE, SIG_IGN);
693
694 while (1) {
695 const char *buf;
696 size_t n;
697 if (feed(feed_state, &buf, &n))
698 break;
699 if (write_in_full(proc.in, buf, n) != n)
700 break;
701 }
702 close(proc.in);
703 if (use_sideband)
704 finish_async(&muxer);
705
706 sigchain_pop(SIGPIPE);
707
708 return finish_command(&proc);
709 }
710
711 static int feed_receive_hook(void *state_, const char **bufp, size_t *sizep)
712 {
713 struct receive_hook_feed_state *state = state_;
714 struct command *cmd = state->cmd;
715
716 while (cmd &&
717 state->skip_broken && (cmd->error_string || cmd->did_not_exist))
718 cmd = cmd->next;
719 if (!cmd)
720 return -1; /* EOF */
721 strbuf_reset(&state->buf);
722 strbuf_addf(&state->buf, "%s %s %s\n",
723 sha1_to_hex(cmd->old_sha1), sha1_to_hex(cmd->new_sha1),
724 cmd->ref_name);
725 state->cmd = cmd->next;
726 if (bufp) {
727 *bufp = state->buf.buf;
728 *sizep = state->buf.len;
729 }
730 return 0;
731 }
732
733 static int run_receive_hook(struct command *commands,
734 const char *hook_name,
735 int skip_broken,
736 const struct string_list *push_options)
737 {
738 struct receive_hook_feed_state state;
739 int status;
740
741 strbuf_init(&state.buf, 0);
742 state.cmd = commands;
743 state.skip_broken = skip_broken;
744 if (feed_receive_hook(&state, NULL, NULL))
745 return 0;
746 state.cmd = commands;
747 state.push_options = push_options;
748 status = run_and_feed_hook(hook_name, feed_receive_hook, &state);
749 strbuf_release(&state.buf);
750 return status;
751 }
752
753 static int run_update_hook(struct command *cmd)
754 {
755 const char *argv[5];
756 struct child_process proc = CHILD_PROCESS_INIT;
757 int code;
758
759 argv[0] = find_hook("update");
760 if (!argv[0])
761 return 0;
762
763 argv[1] = cmd->ref_name;
764 argv[2] = sha1_to_hex(cmd->old_sha1);
765 argv[3] = sha1_to_hex(cmd->new_sha1);
766 argv[4] = NULL;
767
768 proc.no_stdin = 1;
769 proc.stdout_to_stderr = 1;
770 proc.err = use_sideband ? -1 : 0;
771 proc.argv = argv;
772 proc.env = tmp_objdir_env(tmp_objdir);
773
774 code = start_command(&proc);
775 if (code)
776 return code;
777 if (use_sideband)
778 copy_to_sideband(proc.err, -1, NULL);
779 return finish_command(&proc);
780 }
781
782 static int is_ref_checked_out(const char *ref)
783 {
784 if (is_bare_repository())
785 return 0;
786
787 if (!head_name)
788 return 0;
789 return !strcmp(head_name, ref);
790 }
791
792 static char *refuse_unconfigured_deny_msg =
793 N_("By default, updating the current branch in a non-bare repository\n"
794 "is denied, because it will make the index and work tree inconsistent\n"
795 "with what you pushed, and will require 'git reset --hard' to match\n"
796 "the work tree to HEAD.\n"
797 "\n"
798 "You can set the 'receive.denyCurrentBranch' configuration variable\n"
799 "to 'ignore' or 'warn' in the remote repository to allow pushing into\n"
800 "its current branch; however, this is not recommended unless you\n"
801 "arranged to update its work tree to match what you pushed in some\n"
802 "other way.\n"
803 "\n"
804 "To squelch this message and still keep the default behaviour, set\n"
805 "'receive.denyCurrentBranch' configuration variable to 'refuse'.");
806
807 static void refuse_unconfigured_deny(void)
808 {
809 rp_error("%s", _(refuse_unconfigured_deny_msg));
810 }
811
812 static char *refuse_unconfigured_deny_delete_current_msg =
813 N_("By default, deleting the current branch is denied, because the next\n"
814 "'git clone' won't result in any file checked out, causing confusion.\n"
815 "\n"
816 "You can set 'receive.denyDeleteCurrent' configuration variable to\n"
817 "'warn' or 'ignore' in the remote repository to allow deleting the\n"
818 "current branch, with or without a warning message.\n"
819 "\n"
820 "To squelch this message, you can set it to 'refuse'.");
821
822 static void refuse_unconfigured_deny_delete_current(void)
823 {
824 rp_error("%s", _(refuse_unconfigured_deny_delete_current_msg));
825 }
826
827 static int command_singleton_iterator(void *cb_data, unsigned char sha1[20]);
828 static int update_shallow_ref(struct command *cmd, struct shallow_info *si)
829 {
830 static struct lock_file shallow_lock;
831 struct sha1_array extra = SHA1_ARRAY_INIT;
832 struct check_connected_options opt = CHECK_CONNECTED_INIT;
833 uint32_t mask = 1 << (cmd->index % 32);
834 int i;
835
836 trace_printf_key(&trace_shallow,
837 "shallow: update_shallow_ref %s\n", cmd->ref_name);
838 for (i = 0; i < si->shallow->nr; i++)
839 if (si->used_shallow[i] &&
840 (si->used_shallow[i][cmd->index / 32] & mask) &&
841 !delayed_reachability_test(si, i))
842 sha1_array_append(&extra, si->shallow->sha1[i]);
843
844 opt.env = tmp_objdir_env(tmp_objdir);
845 setup_alternate_shallow(&shallow_lock, &opt.shallow_file, &extra);
846 if (check_connected(command_singleton_iterator, cmd, &opt)) {
847 rollback_lock_file(&shallow_lock);
848 sha1_array_clear(&extra);
849 return -1;
850 }
851
852 commit_lock_file(&shallow_lock);
853
854 /*
855 * Make sure setup_alternate_shallow() for the next ref does
856 * not lose these new roots..
857 */
858 for (i = 0; i < extra.nr; i++)
859 register_shallow(extra.sha1[i]);
860
861 si->shallow_ref[cmd->index] = 0;
862 sha1_array_clear(&extra);
863 return 0;
864 }
865
866 /*
867 * NEEDSWORK: we should consolidate various implementions of "are we
868 * on an unborn branch?" test into one, and make the unified one more
869 * robust. !get_sha1() based check used here and elsewhere would not
870 * allow us to tell an unborn branch from corrupt ref, for example.
871 * For the purpose of fixing "deploy-to-update does not work when
872 * pushing into an empty repository" issue, this should suffice for
873 * now.
874 */
875 static int head_has_history(void)
876 {
877 unsigned char sha1[20];
878
879 return !get_sha1("HEAD", sha1);
880 }
881
882 static const char *push_to_deploy(unsigned char *sha1,
883 struct argv_array *env,
884 const char *work_tree)
885 {
886 const char *update_refresh[] = {
887 "update-index", "-q", "--ignore-submodules", "--refresh", NULL
888 };
889 const char *diff_files[] = {
890 "diff-files", "--quiet", "--ignore-submodules", "--", NULL
891 };
892 const char *diff_index[] = {
893 "diff-index", "--quiet", "--cached", "--ignore-submodules",
894 NULL, "--", NULL
895 };
896 const char *read_tree[] = {
897 "read-tree", "-u", "-m", NULL, NULL
898 };
899 struct child_process child = CHILD_PROCESS_INIT;
900
901 child.argv = update_refresh;
902 child.env = env->argv;
903 child.dir = work_tree;
904 child.no_stdin = 1;
905 child.stdout_to_stderr = 1;
906 child.git_cmd = 1;
907 if (run_command(&child))
908 return "Up-to-date check failed";
909
910 /* run_command() does not clean up completely; reinitialize */
911 child_process_init(&child);
912 child.argv = diff_files;
913 child.env = env->argv;
914 child.dir = work_tree;
915 child.no_stdin = 1;
916 child.stdout_to_stderr = 1;
917 child.git_cmd = 1;
918 if (run_command(&child))
919 return "Working directory has unstaged changes";
920
921 /* diff-index with either HEAD or an empty tree */
922 diff_index[4] = head_has_history() ? "HEAD" : EMPTY_TREE_SHA1_HEX;
923
924 child_process_init(&child);
925 child.argv = diff_index;
926 child.env = env->argv;
927 child.no_stdin = 1;
928 child.no_stdout = 1;
929 child.stdout_to_stderr = 0;
930 child.git_cmd = 1;
931 if (run_command(&child))
932 return "Working directory has staged changes";
933
934 read_tree[3] = sha1_to_hex(sha1);
935 child_process_init(&child);
936 child.argv = read_tree;
937 child.env = env->argv;
938 child.dir = work_tree;
939 child.no_stdin = 1;
940 child.no_stdout = 1;
941 child.stdout_to_stderr = 0;
942 child.git_cmd = 1;
943 if (run_command(&child))
944 return "Could not update working tree to new HEAD";
945
946 return NULL;
947 }
948
949 static const char *push_to_checkout_hook = "push-to-checkout";
950
951 static const char *push_to_checkout(unsigned char *sha1,
952 struct argv_array *env,
953 const char *work_tree)
954 {
955 argv_array_pushf(env, "GIT_WORK_TREE=%s", absolute_path(work_tree));
956 if (run_hook_le(env->argv, push_to_checkout_hook,
957 sha1_to_hex(sha1), NULL))
958 return "push-to-checkout hook declined";
959 else
960 return NULL;
961 }
962
963 static const char *update_worktree(unsigned char *sha1)
964 {
965 const char *retval;
966 const char *work_tree = git_work_tree_cfg ? git_work_tree_cfg : "..";
967 struct argv_array env = ARGV_ARRAY_INIT;
968
969 if (is_bare_repository())
970 return "denyCurrentBranch = updateInstead needs a worktree";
971
972 argv_array_pushf(&env, "GIT_DIR=%s", absolute_path(get_git_dir()));
973
974 if (!find_hook(push_to_checkout_hook))
975 retval = push_to_deploy(sha1, &env, work_tree);
976 else
977 retval = push_to_checkout(sha1, &env, work_tree);
978
979 argv_array_clear(&env);
980 return retval;
981 }
982
983 static const char *update(struct command *cmd, struct shallow_info *si)
984 {
985 const char *name = cmd->ref_name;
986 struct strbuf namespaced_name_buf = STRBUF_INIT;
987 const char *namespaced_name, *ret;
988 unsigned char *old_sha1 = cmd->old_sha1;
989 unsigned char *new_sha1 = cmd->new_sha1;
990
991 /* only refs/... are allowed */
992 if (!starts_with(name, "refs/") || check_refname_format(name + 5, 0)) {
993 rp_error("refusing to create funny ref '%s' remotely", name);
994 return "funny refname";
995 }
996
997 strbuf_addf(&namespaced_name_buf, "%s%s", get_git_namespace(), name);
998 namespaced_name = strbuf_detach(&namespaced_name_buf, NULL);
999
1000 if (is_ref_checked_out(namespaced_name)) {
1001 switch (deny_current_branch) {
1002 case DENY_IGNORE:
1003 break;
1004 case DENY_WARN:
1005 rp_warning("updating the current branch");
1006 break;
1007 case DENY_REFUSE:
1008 case DENY_UNCONFIGURED:
1009 rp_error("refusing to update checked out branch: %s", name);
1010 if (deny_current_branch == DENY_UNCONFIGURED)
1011 refuse_unconfigured_deny();
1012 return "branch is currently checked out";
1013 case DENY_UPDATE_INSTEAD:
1014 ret = update_worktree(new_sha1);
1015 if (ret)
1016 return ret;
1017 break;
1018 }
1019 }
1020
1021 if (!is_null_sha1(new_sha1) && !has_sha1_file(new_sha1)) {
1022 error("unpack should have generated %s, "
1023 "but I can't find it!", sha1_to_hex(new_sha1));
1024 return "bad pack";
1025 }
1026
1027 if (!is_null_sha1(old_sha1) && is_null_sha1(new_sha1)) {
1028 if (deny_deletes && starts_with(name, "refs/heads/")) {
1029 rp_error("denying ref deletion for %s", name);
1030 return "deletion prohibited";
1031 }
1032
1033 if (head_name && !strcmp(namespaced_name, head_name)) {
1034 switch (deny_delete_current) {
1035 case DENY_IGNORE:
1036 break;
1037 case DENY_WARN:
1038 rp_warning("deleting the current branch");
1039 break;
1040 case DENY_REFUSE:
1041 case DENY_UNCONFIGURED:
1042 case DENY_UPDATE_INSTEAD:
1043 if (deny_delete_current == DENY_UNCONFIGURED)
1044 refuse_unconfigured_deny_delete_current();
1045 rp_error("refusing to delete the current branch: %s", name);
1046 return "deletion of the current branch prohibited";
1047 default:
1048 return "Invalid denyDeleteCurrent setting";
1049 }
1050 }
1051 }
1052
1053 if (deny_non_fast_forwards && !is_null_sha1(new_sha1) &&
1054 !is_null_sha1(old_sha1) &&
1055 starts_with(name, "refs/heads/")) {
1056 struct object *old_object, *new_object;
1057 struct commit *old_commit, *new_commit;
1058
1059 old_object = parse_object(old_sha1);
1060 new_object = parse_object(new_sha1);
1061
1062 if (!old_object || !new_object ||
1063 old_object->type != OBJ_COMMIT ||
1064 new_object->type != OBJ_COMMIT) {
1065 error("bad sha1 objects for %s", name);
1066 return "bad ref";
1067 }
1068 old_commit = (struct commit *)old_object;
1069 new_commit = (struct commit *)new_object;
1070 if (!in_merge_bases(old_commit, new_commit)) {
1071 rp_error("denying non-fast-forward %s"
1072 " (you should pull first)", name);
1073 return "non-fast-forward";
1074 }
1075 }
1076 if (run_update_hook(cmd)) {
1077 rp_error("hook declined to update %s", name);
1078 return "hook declined";
1079 }
1080
1081 if (is_null_sha1(new_sha1)) {
1082 struct strbuf err = STRBUF_INIT;
1083 if (!parse_object(old_sha1)) {
1084 old_sha1 = NULL;
1085 if (ref_exists(name)) {
1086 rp_warning("Allowing deletion of corrupt ref.");
1087 } else {
1088 rp_warning("Deleting a non-existent ref.");
1089 cmd->did_not_exist = 1;
1090 }
1091 }
1092 if (ref_transaction_delete(transaction,
1093 namespaced_name,
1094 old_sha1,
1095 0, "push", &err)) {
1096 rp_error("%s", err.buf);
1097 strbuf_release(&err);
1098 return "failed to delete";
1099 }
1100 strbuf_release(&err);
1101 return NULL; /* good */
1102 }
1103 else {
1104 struct strbuf err = STRBUF_INIT;
1105 if (shallow_update && si->shallow_ref[cmd->index] &&
1106 update_shallow_ref(cmd, si))
1107 return "shallow error";
1108
1109 if (ref_transaction_update(transaction,
1110 namespaced_name,
1111 new_sha1, old_sha1,
1112 0, "push",
1113 &err)) {
1114 rp_error("%s", err.buf);
1115 strbuf_release(&err);
1116
1117 return "failed to update ref";
1118 }
1119 strbuf_release(&err);
1120
1121 return NULL; /* good */
1122 }
1123 }
1124
1125 static void run_update_post_hook(struct command *commands)
1126 {
1127 struct command *cmd;
1128 struct child_process proc = CHILD_PROCESS_INIT;
1129 const char *hook;
1130
1131 hook = find_hook("post-update");
1132 if (!hook)
1133 return;
1134
1135 for (cmd = commands; cmd; cmd = cmd->next) {
1136 if (cmd->error_string || cmd->did_not_exist)
1137 continue;
1138 if (!proc.args.argc)
1139 argv_array_push(&proc.args, hook);
1140 argv_array_push(&proc.args, cmd->ref_name);
1141 }
1142 if (!proc.args.argc)
1143 return;
1144
1145 proc.no_stdin = 1;
1146 proc.stdout_to_stderr = 1;
1147 proc.err = use_sideband ? -1 : 0;
1148
1149 if (!start_command(&proc)) {
1150 if (use_sideband)
1151 copy_to_sideband(proc.err, -1, NULL);
1152 finish_command(&proc);
1153 }
1154 }
1155
1156 static void check_aliased_update(struct command *cmd, struct string_list *list)
1157 {
1158 struct strbuf buf = STRBUF_INIT;
1159 const char *dst_name;
1160 struct string_list_item *item;
1161 struct command *dst_cmd;
1162 unsigned char sha1[GIT_SHA1_RAWSZ];
1163 int flag;
1164
1165 strbuf_addf(&buf, "%s%s", get_git_namespace(), cmd->ref_name);
1166 dst_name = resolve_ref_unsafe(buf.buf, 0, sha1, &flag);
1167 strbuf_release(&buf);
1168
1169 if (!(flag & REF_ISSYMREF))
1170 return;
1171
1172 if (!dst_name) {
1173 rp_error("refusing update to broken symref '%s'", cmd->ref_name);
1174 cmd->skip_update = 1;
1175 cmd->error_string = "broken symref";
1176 return;
1177 }
1178 dst_name = strip_namespace(dst_name);
1179
1180 if ((item = string_list_lookup(list, dst_name)) == NULL)
1181 return;
1182
1183 cmd->skip_update = 1;
1184
1185 dst_cmd = (struct command *) item->util;
1186
1187 if (!hashcmp(cmd->old_sha1, dst_cmd->old_sha1) &&
1188 !hashcmp(cmd->new_sha1, dst_cmd->new_sha1))
1189 return;
1190
1191 dst_cmd->skip_update = 1;
1192
1193 rp_error("refusing inconsistent update between symref '%s' (%s..%s) and"
1194 " its target '%s' (%s..%s)",
1195 cmd->ref_name,
1196 find_unique_abbrev(cmd->old_sha1, DEFAULT_ABBREV),
1197 find_unique_abbrev(cmd->new_sha1, DEFAULT_ABBREV),
1198 dst_cmd->ref_name,
1199 find_unique_abbrev(dst_cmd->old_sha1, DEFAULT_ABBREV),
1200 find_unique_abbrev(dst_cmd->new_sha1, DEFAULT_ABBREV));
1201
1202 cmd->error_string = dst_cmd->error_string =
1203 "inconsistent aliased update";
1204 }
1205
1206 static void check_aliased_updates(struct command *commands)
1207 {
1208 struct command *cmd;
1209 struct string_list ref_list = STRING_LIST_INIT_NODUP;
1210
1211 for (cmd = commands; cmd; cmd = cmd->next) {
1212 struct string_list_item *item =
1213 string_list_append(&ref_list, cmd->ref_name);
1214 item->util = (void *)cmd;
1215 }
1216 string_list_sort(&ref_list);
1217
1218 for (cmd = commands; cmd; cmd = cmd->next) {
1219 if (!cmd->error_string)
1220 check_aliased_update(cmd, &ref_list);
1221 }
1222
1223 string_list_clear(&ref_list, 0);
1224 }
1225
1226 static int command_singleton_iterator(void *cb_data, unsigned char sha1[20])
1227 {
1228 struct command **cmd_list = cb_data;
1229 struct command *cmd = *cmd_list;
1230
1231 if (!cmd || is_null_sha1(cmd->new_sha1))
1232 return -1; /* end of list */
1233 *cmd_list = NULL; /* this returns only one */
1234 hashcpy(sha1, cmd->new_sha1);
1235 return 0;
1236 }
1237
1238 static void set_connectivity_errors(struct command *commands,
1239 struct shallow_info *si)
1240 {
1241 struct command *cmd;
1242
1243 for (cmd = commands; cmd; cmd = cmd->next) {
1244 struct command *singleton = cmd;
1245 struct check_connected_options opt = CHECK_CONNECTED_INIT;
1246
1247 if (shallow_update && si->shallow_ref[cmd->index])
1248 /* to be checked in update_shallow_ref() */
1249 continue;
1250
1251 opt.env = tmp_objdir_env(tmp_objdir);
1252 if (!check_connected(command_singleton_iterator, &singleton,
1253 &opt))
1254 continue;
1255
1256 cmd->error_string = "missing necessary objects";
1257 }
1258 }
1259
1260 struct iterate_data {
1261 struct command *cmds;
1262 struct shallow_info *si;
1263 };
1264
1265 static int iterate_receive_command_list(void *cb_data, unsigned char sha1[20])
1266 {
1267 struct iterate_data *data = cb_data;
1268 struct command **cmd_list = &data->cmds;
1269 struct command *cmd = *cmd_list;
1270
1271 for (; cmd; cmd = cmd->next) {
1272 if (shallow_update && data->si->shallow_ref[cmd->index])
1273 /* to be checked in update_shallow_ref() */
1274 continue;
1275 if (!is_null_sha1(cmd->new_sha1) && !cmd->skip_update) {
1276 hashcpy(sha1, cmd->new_sha1);
1277 *cmd_list = cmd->next;
1278 return 0;
1279 }
1280 }
1281 *cmd_list = NULL;
1282 return -1; /* end of list */
1283 }
1284
1285 static void reject_updates_to_hidden(struct command *commands)
1286 {
1287 struct strbuf refname_full = STRBUF_INIT;
1288 size_t prefix_len;
1289 struct command *cmd;
1290
1291 strbuf_addstr(&refname_full, get_git_namespace());
1292 prefix_len = refname_full.len;
1293
1294 for (cmd = commands; cmd; cmd = cmd->next) {
1295 if (cmd->error_string)
1296 continue;
1297
1298 strbuf_setlen(&refname_full, prefix_len);
1299 strbuf_addstr(&refname_full, cmd->ref_name);
1300
1301 if (!ref_is_hidden(cmd->ref_name, refname_full.buf))
1302 continue;
1303 if (is_null_sha1(cmd->new_sha1))
1304 cmd->error_string = "deny deleting a hidden ref";
1305 else
1306 cmd->error_string = "deny updating a hidden ref";
1307 }
1308
1309 strbuf_release(&refname_full);
1310 }
1311
1312 static int should_process_cmd(struct command *cmd)
1313 {
1314 return !cmd->error_string && !cmd->skip_update;
1315 }
1316
1317 static void warn_if_skipped_connectivity_check(struct command *commands,
1318 struct shallow_info *si)
1319 {
1320 struct command *cmd;
1321 int checked_connectivity = 1;
1322
1323 for (cmd = commands; cmd; cmd = cmd->next) {
1324 if (should_process_cmd(cmd) && si->shallow_ref[cmd->index]) {
1325 error("BUG: connectivity check has not been run on ref %s",
1326 cmd->ref_name);
1327 checked_connectivity = 0;
1328 }
1329 }
1330 if (!checked_connectivity)
1331 die("BUG: connectivity check skipped???");
1332 }
1333
1334 static void execute_commands_non_atomic(struct command *commands,
1335 struct shallow_info *si)
1336 {
1337 struct command *cmd;
1338 struct strbuf err = STRBUF_INIT;
1339
1340 for (cmd = commands; cmd; cmd = cmd->next) {
1341 if (!should_process_cmd(cmd))
1342 continue;
1343
1344 transaction = ref_transaction_begin(&err);
1345 if (!transaction) {
1346 rp_error("%s", err.buf);
1347 strbuf_reset(&err);
1348 cmd->error_string = "transaction failed to start";
1349 continue;
1350 }
1351
1352 cmd->error_string = update(cmd, si);
1353
1354 if (!cmd->error_string
1355 && ref_transaction_commit(transaction, &err)) {
1356 rp_error("%s", err.buf);
1357 strbuf_reset(&err);
1358 cmd->error_string = "failed to update ref";
1359 }
1360 ref_transaction_free(transaction);
1361 }
1362 strbuf_release(&err);
1363 }
1364
1365 static void execute_commands_atomic(struct command *commands,
1366 struct shallow_info *si)
1367 {
1368 struct command *cmd;
1369 struct strbuf err = STRBUF_INIT;
1370 const char *reported_error = "atomic push failure";
1371
1372 transaction = ref_transaction_begin(&err);
1373 if (!transaction) {
1374 rp_error("%s", err.buf);
1375 strbuf_reset(&err);
1376 reported_error = "transaction failed to start";
1377 goto failure;
1378 }
1379
1380 for (cmd = commands; cmd; cmd = cmd->next) {
1381 if (!should_process_cmd(cmd))
1382 continue;
1383
1384 cmd->error_string = update(cmd, si);
1385
1386 if (cmd->error_string)
1387 goto failure;
1388 }
1389
1390 if (ref_transaction_commit(transaction, &err)) {
1391 rp_error("%s", err.buf);
1392 reported_error = "atomic transaction failed";
1393 goto failure;
1394 }
1395 goto cleanup;
1396
1397 failure:
1398 for (cmd = commands; cmd; cmd = cmd->next)
1399 if (!cmd->error_string)
1400 cmd->error_string = reported_error;
1401
1402 cleanup:
1403 ref_transaction_free(transaction);
1404 strbuf_release(&err);
1405 }
1406
1407 static void execute_commands(struct command *commands,
1408 const char *unpacker_error,
1409 struct shallow_info *si,
1410 const struct string_list *push_options)
1411 {
1412 struct check_connected_options opt = CHECK_CONNECTED_INIT;
1413 struct command *cmd;
1414 unsigned char sha1[20];
1415 struct iterate_data data;
1416 struct async muxer;
1417 int err_fd = 0;
1418
1419 if (unpacker_error) {
1420 for (cmd = commands; cmd; cmd = cmd->next)
1421 cmd->error_string = "unpacker error";
1422 return;
1423 }
1424
1425 if (use_sideband) {
1426 memset(&muxer, 0, sizeof(muxer));
1427 muxer.proc = copy_to_sideband;
1428 muxer.in = -1;
1429 if (!start_async(&muxer))
1430 err_fd = muxer.in;
1431 /* ...else, continue without relaying sideband */
1432 }
1433
1434 data.cmds = commands;
1435 data.si = si;
1436 opt.err_fd = err_fd;
1437 opt.progress = err_fd && !quiet;
1438 opt.env = tmp_objdir_env(tmp_objdir);
1439 if (check_connected(iterate_receive_command_list, &data, &opt))
1440 set_connectivity_errors(commands, si);
1441
1442 if (use_sideband)
1443 finish_async(&muxer);
1444
1445 reject_updates_to_hidden(commands);
1446
1447 if (run_receive_hook(commands, "pre-receive", 0, push_options)) {
1448 for (cmd = commands; cmd; cmd = cmd->next) {
1449 if (!cmd->error_string)
1450 cmd->error_string = "pre-receive hook declined";
1451 }
1452 return;
1453 }
1454
1455 /*
1456 * Now we'll start writing out refs, which means the objects need
1457 * to be in their final positions so that other processes can see them.
1458 */
1459 if (tmp_objdir_migrate(tmp_objdir) < 0) {
1460 for (cmd = commands; cmd; cmd = cmd->next) {
1461 if (!cmd->error_string)
1462 cmd->error_string = "unable to migrate objects to permanent storage";
1463 }
1464 return;
1465 }
1466 tmp_objdir = NULL;
1467
1468 check_aliased_updates(commands);
1469
1470 free(head_name_to_free);
1471 head_name = head_name_to_free = resolve_refdup("HEAD", 0, sha1, NULL);
1472
1473 if (use_atomic)
1474 execute_commands_atomic(commands, si);
1475 else
1476 execute_commands_non_atomic(commands, si);
1477
1478 if (shallow_update)
1479 warn_if_skipped_connectivity_check(commands, si);
1480 }
1481
1482 static struct command **queue_command(struct command **tail,
1483 const char *line,
1484 int linelen)
1485 {
1486 unsigned char old_sha1[20], new_sha1[20];
1487 struct command *cmd;
1488 const char *refname;
1489 int reflen;
1490
1491 if (linelen < 83 ||
1492 line[40] != ' ' ||
1493 line[81] != ' ' ||
1494 get_sha1_hex(line, old_sha1) ||
1495 get_sha1_hex(line + 41, new_sha1))
1496 die("protocol error: expected old/new/ref, got '%s'", line);
1497
1498 refname = line + 82;
1499 reflen = linelen - 82;
1500 FLEX_ALLOC_MEM(cmd, ref_name, refname, reflen);
1501 hashcpy(cmd->old_sha1, old_sha1);
1502 hashcpy(cmd->new_sha1, new_sha1);
1503 *tail = cmd;
1504 return &cmd->next;
1505 }
1506
1507 static void queue_commands_from_cert(struct command **tail,
1508 struct strbuf *push_cert)
1509 {
1510 const char *boc, *eoc;
1511
1512 if (*tail)
1513 die("protocol error: got both push certificate and unsigned commands");
1514
1515 boc = strstr(push_cert->buf, "\n\n");
1516 if (!boc)
1517 die("malformed push certificate %.*s", 100, push_cert->buf);
1518 else
1519 boc += 2;
1520 eoc = push_cert->buf + parse_signature(push_cert->buf, push_cert->len);
1521
1522 while (boc < eoc) {
1523 const char *eol = memchr(boc, '\n', eoc - boc);
1524 tail = queue_command(tail, boc, eol ? eol - boc : eoc - eol);
1525 boc = eol ? eol + 1 : eoc;
1526 }
1527 }
1528
1529 static struct command *read_head_info(struct sha1_array *shallow)
1530 {
1531 struct command *commands = NULL;
1532 struct command **p = &commands;
1533 for (;;) {
1534 char *line;
1535 int len, linelen;
1536
1537 line = packet_read_line(0, &len);
1538 if (!line)
1539 break;
1540
1541 if (len == 48 && starts_with(line, "shallow ")) {
1542 unsigned char sha1[20];
1543 if (get_sha1_hex(line + 8, sha1))
1544 die("protocol error: expected shallow sha, got '%s'",
1545 line + 8);
1546 sha1_array_append(shallow, sha1);
1547 continue;
1548 }
1549
1550 linelen = strlen(line);
1551 if (linelen < len) {
1552 const char *feature_list = line + linelen + 1;
1553 if (parse_feature_request(feature_list, "report-status"))
1554 report_status = 1;
1555 if (parse_feature_request(feature_list, "side-band-64k"))
1556 use_sideband = LARGE_PACKET_MAX;
1557 if (parse_feature_request(feature_list, "quiet"))
1558 quiet = 1;
1559 if (advertise_atomic_push
1560 && parse_feature_request(feature_list, "atomic"))
1561 use_atomic = 1;
1562 if (advertise_push_options
1563 && parse_feature_request(feature_list, "push-options"))
1564 use_push_options = 1;
1565 }
1566
1567 if (!strcmp(line, "push-cert")) {
1568 int true_flush = 0;
1569 char certbuf[1024];
1570
1571 for (;;) {
1572 len = packet_read(0, NULL, NULL,
1573 certbuf, sizeof(certbuf), 0);
1574 if (!len) {
1575 true_flush = 1;
1576 break;
1577 }
1578 if (!strcmp(certbuf, "push-cert-end\n"))
1579 break; /* end of cert */
1580 strbuf_addstr(&push_cert, certbuf);
1581 }
1582
1583 if (true_flush)
1584 break;
1585 continue;
1586 }
1587
1588 p = queue_command(p, line, linelen);
1589 }
1590
1591 if (push_cert.len)
1592 queue_commands_from_cert(p, &push_cert);
1593
1594 return commands;
1595 }
1596
1597 static void read_push_options(struct string_list *options)
1598 {
1599 while (1) {
1600 char *line;
1601 int len;
1602
1603 line = packet_read_line(0, &len);
1604
1605 if (!line)
1606 break;
1607
1608 string_list_append(options, line);
1609 }
1610 }
1611
1612 static const char *parse_pack_header(struct pack_header *hdr)
1613 {
1614 switch (read_pack_header(0, hdr)) {
1615 case PH_ERROR_EOF:
1616 return "eof before pack header was fully read";
1617
1618 case PH_ERROR_PACK_SIGNATURE:
1619 return "protocol error (pack signature mismatch detected)";
1620
1621 case PH_ERROR_PROTOCOL:
1622 return "protocol error (pack version unsupported)";
1623
1624 default:
1625 return "unknown error in parse_pack_header";
1626
1627 case 0:
1628 return NULL;
1629 }
1630 }
1631
1632 static const char *pack_lockfile;
1633
1634 static const char *unpack(int err_fd, struct shallow_info *si)
1635 {
1636 struct pack_header hdr;
1637 const char *hdr_err;
1638 int status;
1639 char hdr_arg[38];
1640 struct child_process child = CHILD_PROCESS_INIT;
1641 int fsck_objects = (receive_fsck_objects >= 0
1642 ? receive_fsck_objects
1643 : transfer_fsck_objects >= 0
1644 ? transfer_fsck_objects
1645 : 0);
1646
1647 hdr_err = parse_pack_header(&hdr);
1648 if (hdr_err) {
1649 if (err_fd > 0)
1650 close(err_fd);
1651 return hdr_err;
1652 }
1653 snprintf(hdr_arg, sizeof(hdr_arg),
1654 "--pack_header=%"PRIu32",%"PRIu32,
1655 ntohl(hdr.hdr_version), ntohl(hdr.hdr_entries));
1656
1657 if (si->nr_ours || si->nr_theirs) {
1658 alt_shallow_file = setup_temporary_shallow(si->shallow);
1659 argv_array_push(&child.args, "--shallow-file");
1660 argv_array_push(&child.args, alt_shallow_file);
1661 }
1662
1663 tmp_objdir = tmp_objdir_create();
1664 if (!tmp_objdir) {
1665 if (err_fd > 0)
1666 close(err_fd);
1667 return "unable to create temporary object directory";
1668 }
1669 child.env = tmp_objdir_env(tmp_objdir);
1670
1671 /*
1672 * Normally we just pass the tmp_objdir environment to the child
1673 * processes that do the heavy lifting, but we may need to see these
1674 * objects ourselves to set up shallow information.
1675 */
1676 tmp_objdir_add_as_alternate(tmp_objdir);
1677
1678 if (ntohl(hdr.hdr_entries) < unpack_limit) {
1679 argv_array_pushl(&child.args, "unpack-objects", hdr_arg, NULL);
1680 if (quiet)
1681 argv_array_push(&child.args, "-q");
1682 if (fsck_objects)
1683 argv_array_pushf(&child.args, "--strict%s",
1684 fsck_msg_types.buf);
1685 if (max_input_size)
1686 argv_array_pushf(&child.args, "--max-input-size=%"PRIuMAX,
1687 (uintmax_t)max_input_size);
1688 child.no_stdout = 1;
1689 child.err = err_fd;
1690 child.git_cmd = 1;
1691 status = run_command(&child);
1692 if (status)
1693 return "unpack-objects abnormal exit";
1694 } else {
1695 char hostname[256];
1696
1697 argv_array_pushl(&child.args, "index-pack",
1698 "--stdin", hdr_arg, NULL);
1699
1700 if (gethostname(hostname, sizeof(hostname)))
1701 xsnprintf(hostname, sizeof(hostname), "localhost");
1702 argv_array_pushf(&child.args,
1703 "--keep=receive-pack %"PRIuMAX" on %s",
1704 (uintmax_t)getpid(),
1705 hostname);
1706
1707 if (!quiet && err_fd)
1708 argv_array_push(&child.args, "--show-resolving-progress");
1709 if (use_sideband)
1710 argv_array_push(&child.args, "--report-end-of-input");
1711 if (fsck_objects)
1712 argv_array_pushf(&child.args, "--strict%s",
1713 fsck_msg_types.buf);
1714 if (!reject_thin)
1715 argv_array_push(&child.args, "--fix-thin");
1716 if (max_input_size)
1717 argv_array_pushf(&child.args, "--max-input-size=%"PRIuMAX,
1718 (uintmax_t)max_input_size);
1719 child.out = -1;
1720 child.err = err_fd;
1721 child.git_cmd = 1;
1722 status = start_command(&child);
1723 if (status)
1724 return "index-pack fork failed";
1725 pack_lockfile = index_pack_lockfile(child.out);
1726 close(child.out);
1727 status = finish_command(&child);
1728 if (status)
1729 return "index-pack abnormal exit";
1730 reprepare_packed_git();
1731 }
1732 return NULL;
1733 }
1734
1735 static const char *unpack_with_sideband(struct shallow_info *si)
1736 {
1737 struct async muxer;
1738 const char *ret;
1739
1740 if (!use_sideband)
1741 return unpack(0, si);
1742
1743 use_keepalive = KEEPALIVE_AFTER_NUL;
1744 memset(&muxer, 0, sizeof(muxer));
1745 muxer.proc = copy_to_sideband;
1746 muxer.in = -1;
1747 if (start_async(&muxer))
1748 return NULL;
1749
1750 ret = unpack(muxer.in, si);
1751
1752 finish_async(&muxer);
1753 return ret;
1754 }
1755
1756 static void prepare_shallow_update(struct command *commands,
1757 struct shallow_info *si)
1758 {
1759 int i, j, k, bitmap_size = (si->ref->nr + 31) / 32;
1760
1761 ALLOC_ARRAY(si->used_shallow, si->shallow->nr);
1762 assign_shallow_commits_to_refs(si, si->used_shallow, NULL);
1763
1764 si->need_reachability_test =
1765 xcalloc(si->shallow->nr, sizeof(*si->need_reachability_test));
1766 si->reachable =
1767 xcalloc(si->shallow->nr, sizeof(*si->reachable));
1768 si->shallow_ref = xcalloc(si->ref->nr, sizeof(*si->shallow_ref));
1769
1770 for (i = 0; i < si->nr_ours; i++)
1771 si->need_reachability_test[si->ours[i]] = 1;
1772
1773 for (i = 0; i < si->shallow->nr; i++) {
1774 if (!si->used_shallow[i])
1775 continue;
1776 for (j = 0; j < bitmap_size; j++) {
1777 if (!si->used_shallow[i][j])
1778 continue;
1779 si->need_reachability_test[i]++;
1780 for (k = 0; k < 32; k++)
1781 if (si->used_shallow[i][j] & (1U << k))
1782 si->shallow_ref[j * 32 + k]++;
1783 }
1784
1785 /*
1786 * true for those associated with some refs and belong
1787 * in "ours" list aka "step 7 not done yet"
1788 */
1789 si->need_reachability_test[i] =
1790 si->need_reachability_test[i] > 1;
1791 }
1792
1793 /*
1794 * keep hooks happy by forcing a temporary shallow file via
1795 * env variable because we can't add --shallow-file to every
1796 * command. check_everything_connected() will be done with
1797 * true .git/shallow though.
1798 */
1799 setenv(GIT_SHALLOW_FILE_ENVIRONMENT, alt_shallow_file, 1);
1800 }
1801
1802 static void update_shallow_info(struct command *commands,
1803 struct shallow_info *si,
1804 struct sha1_array *ref)
1805 {
1806 struct command *cmd;
1807 int *ref_status;
1808 remove_nonexistent_theirs_shallow(si);
1809 if (!si->nr_ours && !si->nr_theirs) {
1810 shallow_update = 0;
1811 return;
1812 }
1813
1814 for (cmd = commands; cmd; cmd = cmd->next) {
1815 if (is_null_sha1(cmd->new_sha1))
1816 continue;
1817 sha1_array_append(ref, cmd->new_sha1);
1818 cmd->index = ref->nr - 1;
1819 }
1820 si->ref = ref;
1821
1822 if (shallow_update) {
1823 prepare_shallow_update(commands, si);
1824 return;
1825 }
1826
1827 ALLOC_ARRAY(ref_status, ref->nr);
1828 assign_shallow_commits_to_refs(si, NULL, ref_status);
1829 for (cmd = commands; cmd; cmd = cmd->next) {
1830 if (is_null_sha1(cmd->new_sha1))
1831 continue;
1832 if (ref_status[cmd->index]) {
1833 cmd->error_string = "shallow update not allowed";
1834 cmd->skip_update = 1;
1835 }
1836 }
1837 free(ref_status);
1838 }
1839
1840 static void report(struct command *commands, const char *unpack_status)
1841 {
1842 struct command *cmd;
1843 struct strbuf buf = STRBUF_INIT;
1844
1845 packet_buf_write(&buf, "unpack %s\n",
1846 unpack_status ? unpack_status : "ok");
1847 for (cmd = commands; cmd; cmd = cmd->next) {
1848 if (!cmd->error_string)
1849 packet_buf_write(&buf, "ok %s\n",
1850 cmd->ref_name);
1851 else
1852 packet_buf_write(&buf, "ng %s %s\n",
1853 cmd->ref_name, cmd->error_string);
1854 }
1855 packet_buf_flush(&buf);
1856
1857 if (use_sideband)
1858 send_sideband(1, 1, buf.buf, buf.len, use_sideband);
1859 else
1860 write_or_die(1, buf.buf, buf.len);
1861 strbuf_release(&buf);
1862 }
1863
1864 static int delete_only(struct command *commands)
1865 {
1866 struct command *cmd;
1867 for (cmd = commands; cmd; cmd = cmd->next) {
1868 if (!is_null_sha1(cmd->new_sha1))
1869 return 0;
1870 }
1871 return 1;
1872 }
1873
1874 int cmd_receive_pack(int argc, const char **argv, const char *prefix)
1875 {
1876 int advertise_refs = 0;
1877 struct command *commands;
1878 struct sha1_array shallow = SHA1_ARRAY_INIT;
1879 struct sha1_array ref = SHA1_ARRAY_INIT;
1880 struct shallow_info si;
1881
1882 struct option options[] = {
1883 OPT__QUIET(&quiet, N_("quiet")),
1884 OPT_HIDDEN_BOOL(0, "stateless-rpc", &stateless_rpc, NULL),
1885 OPT_HIDDEN_BOOL(0, "advertise-refs", &advertise_refs, NULL),
1886 OPT_HIDDEN_BOOL(0, "reject-thin-pack-for-testing", &reject_thin, NULL),
1887 OPT_END()
1888 };
1889
1890 packet_trace_identity("receive-pack");
1891
1892 argc = parse_options(argc, argv, prefix, options, receive_pack_usage, 0);
1893
1894 if (argc > 1)
1895 usage_msg_opt(_("Too many arguments."), receive_pack_usage, options);
1896 if (argc == 0)
1897 usage_msg_opt(_("You must specify a directory."), receive_pack_usage, options);
1898
1899 service_dir = argv[0];
1900
1901 setup_path();
1902
1903 if (!enter_repo(service_dir, 0))
1904 die("'%s' does not appear to be a git repository", service_dir);
1905
1906 git_config(receive_pack_config, NULL);
1907 if (cert_nonce_seed)
1908 push_cert_nonce = prepare_push_cert_nonce(service_dir, time(NULL));
1909
1910 if (0 <= transfer_unpack_limit)
1911 unpack_limit = transfer_unpack_limit;
1912 else if (0 <= receive_unpack_limit)
1913 unpack_limit = receive_unpack_limit;
1914
1915 if (advertise_refs || !stateless_rpc) {
1916 write_head_info();
1917 }
1918 if (advertise_refs)
1919 return 0;
1920
1921 if ((commands = read_head_info(&shallow)) != NULL) {
1922 const char *unpack_status = NULL;
1923 struct string_list push_options = STRING_LIST_INIT_DUP;
1924
1925 if (use_push_options)
1926 read_push_options(&push_options);
1927
1928 prepare_shallow_info(&si, &shallow);
1929 if (!si.nr_ours && !si.nr_theirs)
1930 shallow_update = 0;
1931 if (!delete_only(commands)) {
1932 unpack_status = unpack_with_sideband(&si);
1933 update_shallow_info(commands, &si, &ref);
1934 }
1935 use_keepalive = KEEPALIVE_ALWAYS;
1936 execute_commands(commands, unpack_status, &si,
1937 &push_options);
1938 if (pack_lockfile)
1939 unlink_or_warn(pack_lockfile);
1940 if (report_status)
1941 report(commands, unpack_status);
1942 run_receive_hook(commands, "post-receive", 1,
1943 &push_options);
1944 run_update_post_hook(commands);
1945 string_list_clear(&push_options, 0);
1946 if (auto_gc) {
1947 const char *argv_gc_auto[] = {
1948 "gc", "--auto", "--quiet", NULL,
1949 };
1950 struct child_process proc = CHILD_PROCESS_INIT;
1951
1952 proc.no_stdin = 1;
1953 proc.stdout_to_stderr = 1;
1954 proc.err = use_sideband ? -1 : 0;
1955 proc.git_cmd = 1;
1956 proc.argv = argv_gc_auto;
1957
1958 close_all_packs();
1959 if (!start_command(&proc)) {
1960 if (use_sideband)
1961 copy_to_sideband(proc.err, -1, NULL);
1962 finish_command(&proc);
1963 }
1964 }
1965 if (auto_update_server_info)
1966 update_server_info(0);
1967 clear_shallow_info(&si);
1968 }
1969 if (use_sideband)
1970 packet_flush(1);
1971 sha1_array_clear(&shallow);
1972 sha1_array_clear(&ref);
1973 free((void *)push_cert_nonce);
1974 return 0;
1975 }
git for Debian