Merge branch 'cc/svn-fe-py-shebang'
[git/git.git] / send-pack.c
1 #include "builtin.h"
2 #include "config.h"
3 #include "commit.h"
4 #include "refs.h"
5 #include "object-store.h"
6 #include "pkt-line.h"
7 #include "sideband.h"
8 #include "run-command.h"
9 #include "remote.h"
10 #include "connect.h"
11 #include "send-pack.h"
12 #include "quote.h"
13 #include "transport.h"
14 #include "version.h"
15 #include "sha1-array.h"
16 #include "gpg-interface.h"
17 #include "cache.h"
18
19 int option_parse_push_signed(const struct option *opt,
20 const char *arg, int unset)
21 {
22 if (unset) {
23 *(int *)(opt->value) = SEND_PACK_PUSH_CERT_NEVER;
24 return 0;
25 }
26 switch (git_parse_maybe_bool(arg)) {
27 case 1:
28 *(int *)(opt->value) = SEND_PACK_PUSH_CERT_ALWAYS;
29 return 0;
30 case 0:
31 *(int *)(opt->value) = SEND_PACK_PUSH_CERT_NEVER;
32 return 0;
33 }
34 if (!strcasecmp("if-asked", arg)) {
35 *(int *)(opt->value) = SEND_PACK_PUSH_CERT_IF_ASKED;
36 return 0;
37 }
38 die("bad %s argument: %s", opt->long_name, arg);
39 }
40
41 static void feed_object(const struct object_id *oid, FILE *fh, int negative)
42 {
43 if (negative && !has_object_file(oid))
44 return;
45
46 if (negative)
47 putc('^', fh);
48 fputs(oid_to_hex(oid), fh);
49 putc('\n', fh);
50 }
51
52 /*
53 * Make a pack stream and spit it out into file descriptor fd
54 */
55 static int pack_objects(int fd, struct ref *refs, struct oid_array *extra, struct send_pack_args *args)
56 {
57 /*
58 * The child becomes pack-objects --revs; we feed
59 * the revision parameters to it via its stdin and
60 * let its stdout go back to the other end.
61 */
62 struct child_process po = CHILD_PROCESS_INIT;
63 FILE *po_in;
64 int i;
65 int rc;
66
67 argv_array_push(&po.args, "pack-objects");
68 argv_array_push(&po.args, "--all-progress-implied");
69 argv_array_push(&po.args, "--revs");
70 argv_array_push(&po.args, "--stdout");
71 if (args->use_thin_pack)
72 argv_array_push(&po.args, "--thin");
73 if (args->use_ofs_delta)
74 argv_array_push(&po.args, "--delta-base-offset");
75 if (args->quiet || !args->progress)
76 argv_array_push(&po.args, "-q");
77 if (args->progress)
78 argv_array_push(&po.args, "--progress");
79 if (is_repository_shallow(the_repository))
80 argv_array_push(&po.args, "--shallow");
81 po.in = -1;
82 po.out = args->stateless_rpc ? -1 : fd;
83 po.git_cmd = 1;
84 if (start_command(&po))
85 die_errno("git pack-objects failed");
86
87 /*
88 * We feed the pack-objects we just spawned with revision
89 * parameters by writing to the pipe.
90 */
91 po_in = xfdopen(po.in, "w");
92 for (i = 0; i < extra->nr; i++)
93 feed_object(&extra->oid[i], po_in, 1);
94
95 while (refs) {
96 if (!is_null_oid(&refs->old_oid))
97 feed_object(&refs->old_oid, po_in, 1);
98 if (!is_null_oid(&refs->new_oid))
99 feed_object(&refs->new_oid, po_in, 0);
100 refs = refs->next;
101 }
102
103 fflush(po_in);
104 if (ferror(po_in))
105 die_errno("error writing to pack-objects");
106 fclose(po_in);
107
108 if (args->stateless_rpc) {
109 char *buf = xmalloc(LARGE_PACKET_MAX);
110 while (1) {
111 ssize_t n = xread(po.out, buf, LARGE_PACKET_MAX);
112 if (n <= 0)
113 break;
114 send_sideband(fd, -1, buf, n, LARGE_PACKET_MAX);
115 }
116 free(buf);
117 close(po.out);
118 po.out = -1;
119 }
120
121 rc = finish_command(&po);
122 if (rc) {
123 /*
124 * For a normal non-zero exit, we assume pack-objects wrote
125 * something useful to stderr. For death by signal, though,
126 * we should mention it to the user. The exception is SIGPIPE
127 * (141), because that's a normal occurrence if the remote end
128 * hangs up (and we'll report that by trying to read the unpack
129 * status).
130 */
131 if (rc > 128 && rc != 141)
132 error("pack-objects died of signal %d", rc - 128);
133 return -1;
134 }
135 return 0;
136 }
137
138 static int receive_unpack_status(struct packet_reader *reader)
139 {
140 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
141 return error(_("unexpected flush packet while reading remote unpack status"));
142 if (!skip_prefix(reader->line, "unpack ", &reader->line))
143 return error(_("unable to parse remote unpack status: %s"), reader->line);
144 if (strcmp(reader->line, "ok"))
145 return error(_("remote unpack failed: %s"), reader->line);
146 return 0;
147 }
148
149 static int receive_status(struct packet_reader *reader, struct ref *refs)
150 {
151 struct ref *hint;
152 int ret;
153
154 hint = NULL;
155 ret = receive_unpack_status(reader);
156 while (1) {
157 const char *refname;
158 char *msg;
159 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
160 break;
161 if (!starts_with(reader->line, "ok ") && !starts_with(reader->line, "ng ")) {
162 error("invalid ref status from remote: %s", reader->line);
163 ret = -1;
164 break;
165 }
166
167 refname = reader->line + 3;
168 msg = strchr(refname, ' ');
169 if (msg)
170 *msg++ = '\0';
171
172 /* first try searching at our hint, falling back to all refs */
173 if (hint)
174 hint = find_ref_by_name(hint, refname);
175 if (!hint)
176 hint = find_ref_by_name(refs, refname);
177 if (!hint) {
178 warning("remote reported status on unknown ref: %s",
179 refname);
180 continue;
181 }
182 if (hint->status != REF_STATUS_EXPECTING_REPORT) {
183 warning("remote reported status on unexpected ref: %s",
184 refname);
185 continue;
186 }
187
188 if (reader->line[0] == 'o' && reader->line[1] == 'k')
189 hint->status = REF_STATUS_OK;
190 else {
191 hint->status = REF_STATUS_REMOTE_REJECT;
192 ret = -1;
193 }
194 hint->remote_status = xstrdup_or_null(msg);
195 /* start our next search from the next ref */
196 hint = hint->next;
197 }
198 return ret;
199 }
200
201 static int sideband_demux(int in, int out, void *data)
202 {
203 int *fd = data, ret;
204 if (async_with_fork())
205 close(fd[1]);
206 ret = recv_sideband("send-pack", fd[0], out);
207 close(out);
208 return ret;
209 }
210
211 static int advertise_shallow_grafts_cb(const struct commit_graft *graft, void *cb)
212 {
213 struct strbuf *sb = cb;
214 if (graft->nr_parent == -1)
215 packet_buf_write(sb, "shallow %s\n", oid_to_hex(&graft->oid));
216 return 0;
217 }
218
219 static void advertise_shallow_grafts_buf(struct strbuf *sb)
220 {
221 if (!is_repository_shallow(the_repository))
222 return;
223 for_each_commit_graft(advertise_shallow_grafts_cb, sb);
224 }
225
226 #define CHECK_REF_NO_PUSH -1
227 #define CHECK_REF_STATUS_REJECTED -2
228 #define CHECK_REF_UPTODATE -3
229 static int check_to_send_update(const struct ref *ref, const struct send_pack_args *args)
230 {
231 if (!ref->peer_ref && !args->send_mirror)
232 return CHECK_REF_NO_PUSH;
233
234 /* Check for statuses set by set_ref_status_for_push() */
235 switch (ref->status) {
236 case REF_STATUS_REJECT_NONFASTFORWARD:
237 case REF_STATUS_REJECT_ALREADY_EXISTS:
238 case REF_STATUS_REJECT_FETCH_FIRST:
239 case REF_STATUS_REJECT_NEEDS_FORCE:
240 case REF_STATUS_REJECT_STALE:
241 case REF_STATUS_REJECT_NODELETE:
242 return CHECK_REF_STATUS_REJECTED;
243 case REF_STATUS_UPTODATE:
244 return CHECK_REF_UPTODATE;
245 default:
246 return 0;
247 }
248 }
249
250 /*
251 * the beginning of the next line, or the end of buffer.
252 *
253 * NEEDSWORK: perhaps move this to git-compat-util.h or somewhere and
254 * convert many similar uses found by "git grep -A4 memchr".
255 */
256 static const char *next_line(const char *line, size_t len)
257 {
258 const char *nl = memchr(line, '\n', len);
259 if (!nl)
260 return line + len; /* incomplete line */
261 return nl + 1;
262 }
263
264 static int generate_push_cert(struct strbuf *req_buf,
265 const struct ref *remote_refs,
266 struct send_pack_args *args,
267 const char *cap_string,
268 const char *push_cert_nonce)
269 {
270 const struct ref *ref;
271 struct string_list_item *item;
272 char *signing_key = xstrdup(get_signing_key());
273 const char *cp, *np;
274 struct strbuf cert = STRBUF_INIT;
275 int update_seen = 0;
276
277 strbuf_addstr(&cert, "certificate version 0.1\n");
278 strbuf_addf(&cert, "pusher %s ", signing_key);
279 datestamp(&cert);
280 strbuf_addch(&cert, '\n');
281 if (args->url && *args->url) {
282 char *anon_url = transport_anonymize_url(args->url);
283 strbuf_addf(&cert, "pushee %s\n", anon_url);
284 free(anon_url);
285 }
286 if (push_cert_nonce[0])
287 strbuf_addf(&cert, "nonce %s\n", push_cert_nonce);
288 if (args->push_options)
289 for_each_string_list_item(item, args->push_options)
290 strbuf_addf(&cert, "push-option %s\n", item->string);
291 strbuf_addstr(&cert, "\n");
292
293 for (ref = remote_refs; ref; ref = ref->next) {
294 if (check_to_send_update(ref, args) < 0)
295 continue;
296 update_seen = 1;
297 strbuf_addf(&cert, "%s %s %s\n",
298 oid_to_hex(&ref->old_oid),
299 oid_to_hex(&ref->new_oid),
300 ref->name);
301 }
302 if (!update_seen)
303 goto free_return;
304
305 if (sign_buffer(&cert, &cert, signing_key))
306 die(_("failed to sign the push certificate"));
307
308 packet_buf_write(req_buf, "push-cert%c%s", 0, cap_string);
309 for (cp = cert.buf; cp < cert.buf + cert.len; cp = np) {
310 np = next_line(cp, cert.buf + cert.len - cp);
311 packet_buf_write(req_buf,
312 "%.*s", (int)(np - cp), cp);
313 }
314 packet_buf_write(req_buf, "push-cert-end\n");
315
316 free_return:
317 free(signing_key);
318 strbuf_release(&cert);
319 return update_seen;
320 }
321
322
323 static int atomic_push_failure(struct send_pack_args *args,
324 struct ref *remote_refs,
325 struct ref *failing_ref)
326 {
327 struct ref *ref;
328 /* Mark other refs as failed */
329 for (ref = remote_refs; ref; ref = ref->next) {
330 if (!ref->peer_ref && !args->send_mirror)
331 continue;
332
333 switch (ref->status) {
334 case REF_STATUS_EXPECTING_REPORT:
335 ref->status = REF_STATUS_ATOMIC_PUSH_FAILED;
336 continue;
337 default:
338 break; /* do nothing */
339 }
340 }
341 return error("atomic push failed for ref %s. status: %d\n",
342 failing_ref->name, failing_ref->status);
343 }
344
345 #define NONCE_LEN_LIMIT 256
346
347 static void reject_invalid_nonce(const char *nonce, int len)
348 {
349 int i = 0;
350
351 if (NONCE_LEN_LIMIT <= len)
352 die("the receiving end asked to sign an invalid nonce <%.*s>",
353 len, nonce);
354
355 for (i = 0; i < len; i++) {
356 int ch = nonce[i] & 0xFF;
357 if (isalnum(ch) ||
358 ch == '-' || ch == '.' ||
359 ch == '/' || ch == '+' ||
360 ch == '=' || ch == '_')
361 continue;
362 die("the receiving end asked to sign an invalid nonce <%.*s>",
363 len, nonce);
364 }
365 }
366
367 int send_pack(struct send_pack_args *args,
368 int fd[], struct child_process *conn,
369 struct ref *remote_refs,
370 struct oid_array *extra_have)
371 {
372 int in = fd[0];
373 int out = fd[1];
374 struct strbuf req_buf = STRBUF_INIT;
375 struct strbuf cap_buf = STRBUF_INIT;
376 struct ref *ref;
377 int need_pack_data = 0;
378 int allow_deleting_refs = 0;
379 int status_report = 0;
380 int use_sideband = 0;
381 int quiet_supported = 0;
382 int agent_supported = 0;
383 int use_atomic = 0;
384 int atomic_supported = 0;
385 int use_push_options = 0;
386 int push_options_supported = 0;
387 unsigned cmds_sent = 0;
388 int ret;
389 struct async demux;
390 const char *push_cert_nonce = NULL;
391 struct packet_reader reader;
392
393 /* Does the other end support the reporting? */
394 if (server_supports("report-status"))
395 status_report = 1;
396 if (server_supports("delete-refs"))
397 allow_deleting_refs = 1;
398 if (server_supports("ofs-delta"))
399 args->use_ofs_delta = 1;
400 if (server_supports("side-band-64k"))
401 use_sideband = 1;
402 if (server_supports("quiet"))
403 quiet_supported = 1;
404 if (server_supports("agent"))
405 agent_supported = 1;
406 if (server_supports("no-thin"))
407 args->use_thin_pack = 0;
408 if (server_supports("atomic"))
409 atomic_supported = 1;
410 if (server_supports("push-options"))
411 push_options_supported = 1;
412
413 if (args->push_cert != SEND_PACK_PUSH_CERT_NEVER) {
414 int len;
415 push_cert_nonce = server_feature_value("push-cert", &len);
416 if (push_cert_nonce) {
417 reject_invalid_nonce(push_cert_nonce, len);
418 push_cert_nonce = xmemdupz(push_cert_nonce, len);
419 } else if (args->push_cert == SEND_PACK_PUSH_CERT_ALWAYS) {
420 die(_("the receiving end does not support --signed push"));
421 } else if (args->push_cert == SEND_PACK_PUSH_CERT_IF_ASKED) {
422 warning(_("not sending a push certificate since the"
423 " receiving end does not support --signed"
424 " push"));
425 }
426 }
427
428 if (!remote_refs) {
429 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
430 "Perhaps you should specify a branch such as 'master'.\n");
431 return 0;
432 }
433 if (args->atomic && !atomic_supported)
434 die(_("the receiving end does not support --atomic push"));
435
436 use_atomic = atomic_supported && args->atomic;
437
438 if (args->push_options && !push_options_supported)
439 die(_("the receiving end does not support push options"));
440
441 use_push_options = push_options_supported && args->push_options;
442
443 if (status_report)
444 strbuf_addstr(&cap_buf, " report-status");
445 if (use_sideband)
446 strbuf_addstr(&cap_buf, " side-band-64k");
447 if (quiet_supported && (args->quiet || !args->progress))
448 strbuf_addstr(&cap_buf, " quiet");
449 if (use_atomic)
450 strbuf_addstr(&cap_buf, " atomic");
451 if (use_push_options)
452 strbuf_addstr(&cap_buf, " push-options");
453 if (agent_supported)
454 strbuf_addf(&cap_buf, " agent=%s", git_user_agent_sanitized());
455
456 /*
457 * NEEDSWORK: why does delete-refs have to be so specific to
458 * send-pack machinery that set_ref_status_for_push() cannot
459 * set this bit for us???
460 */
461 for (ref = remote_refs; ref; ref = ref->next)
462 if (ref->deletion && !allow_deleting_refs)
463 ref->status = REF_STATUS_REJECT_NODELETE;
464
465 if (!args->dry_run)
466 advertise_shallow_grafts_buf(&req_buf);
467
468 if (!args->dry_run && push_cert_nonce)
469 cmds_sent = generate_push_cert(&req_buf, remote_refs, args,
470 cap_buf.buf, push_cert_nonce);
471
472 /*
473 * Clear the status for each ref and see if we need to send
474 * the pack data.
475 */
476 for (ref = remote_refs; ref; ref = ref->next) {
477 switch (check_to_send_update(ref, args)) {
478 case 0: /* no error */
479 break;
480 case CHECK_REF_STATUS_REJECTED:
481 /*
482 * When we know the server would reject a ref update if
483 * we were to send it and we're trying to send the refs
484 * atomically, abort the whole operation.
485 */
486 if (use_atomic) {
487 strbuf_release(&req_buf);
488 strbuf_release(&cap_buf);
489 return atomic_push_failure(args, remote_refs, ref);
490 }
491 /* else fallthrough */
492 default:
493 continue;
494 }
495 if (!ref->deletion)
496 need_pack_data = 1;
497
498 if (args->dry_run || !status_report)
499 ref->status = REF_STATUS_OK;
500 else
501 ref->status = REF_STATUS_EXPECTING_REPORT;
502 }
503
504 /*
505 * Finally, tell the other end!
506 */
507 for (ref = remote_refs; ref; ref = ref->next) {
508 char *old_hex, *new_hex;
509
510 if (args->dry_run || push_cert_nonce)
511 continue;
512
513 if (check_to_send_update(ref, args) < 0)
514 continue;
515
516 old_hex = oid_to_hex(&ref->old_oid);
517 new_hex = oid_to_hex(&ref->new_oid);
518 if (!cmds_sent) {
519 packet_buf_write(&req_buf,
520 "%s %s %s%c%s",
521 old_hex, new_hex, ref->name, 0,
522 cap_buf.buf);
523 cmds_sent = 1;
524 } else {
525 packet_buf_write(&req_buf, "%s %s %s",
526 old_hex, new_hex, ref->name);
527 }
528 }
529
530 if (use_push_options) {
531 struct string_list_item *item;
532
533 packet_buf_flush(&req_buf);
534 for_each_string_list_item(item, args->push_options)
535 packet_buf_write(&req_buf, "%s", item->string);
536 }
537
538 if (args->stateless_rpc) {
539 if (!args->dry_run && (cmds_sent || is_repository_shallow(the_repository))) {
540 packet_buf_flush(&req_buf);
541 send_sideband(out, -1, req_buf.buf, req_buf.len, LARGE_PACKET_MAX);
542 }
543 } else {
544 write_or_die(out, req_buf.buf, req_buf.len);
545 packet_flush(out);
546 }
547 strbuf_release(&req_buf);
548 strbuf_release(&cap_buf);
549
550 if (use_sideband && cmds_sent) {
551 memset(&demux, 0, sizeof(demux));
552 demux.proc = sideband_demux;
553 demux.data = fd;
554 demux.out = -1;
555 demux.isolate_sigpipe = 1;
556 if (start_async(&demux))
557 die("send-pack: unable to fork off sideband demultiplexer");
558 in = demux.out;
559 }
560
561 packet_reader_init(&reader, in, NULL, 0,
562 PACKET_READ_CHOMP_NEWLINE |
563 PACKET_READ_DIE_ON_ERR_PACKET);
564
565 if (need_pack_data && cmds_sent) {
566 if (pack_objects(out, remote_refs, extra_have, args) < 0) {
567 for (ref = remote_refs; ref; ref = ref->next)
568 ref->status = REF_STATUS_NONE;
569 if (args->stateless_rpc)
570 close(out);
571 if (git_connection_is_socket(conn))
572 shutdown(fd[0], SHUT_WR);
573
574 /*
575 * Do not even bother with the return value; we know we
576 * are failing, and just want the error() side effects.
577 */
578 if (status_report)
579 receive_unpack_status(&reader);
580
581 if (use_sideband) {
582 close(demux.out);
583 finish_async(&demux);
584 }
585 fd[1] = -1;
586 return -1;
587 }
588 if (!args->stateless_rpc)
589 /* Closed by pack_objects() via start_command() */
590 fd[1] = -1;
591 }
592 if (args->stateless_rpc && cmds_sent)
593 packet_flush(out);
594
595 if (status_report && cmds_sent)
596 ret = receive_status(&reader, remote_refs);
597 else
598 ret = 0;
599 if (args->stateless_rpc)
600 packet_flush(out);
601
602 if (use_sideband && cmds_sent) {
603 close(demux.out);
604 if (finish_async(&demux)) {
605 error("error in sideband demultiplexer");
606 ret = -1;
607 }
608 }
609
610 if (ret < 0)
611 return ret;
612
613 if (args->porcelain)
614 return 0;
615
616 for (ref = remote_refs; ref; ref = ref->next) {
617 switch (ref->status) {
618 case REF_STATUS_NONE:
619 case REF_STATUS_UPTODATE:
620 case REF_STATUS_OK:
621 break;
622 default:
623 return -1;
624 }
625 }
626 return 0;
627 }