Fourth batch
[git.git] / send-pack.c
blobd671ab5d05c5dfd5acb1c597f68caf58d98dca9b
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 "oid-array.h"
16 #include "gpg-interface.h"
17 #include "cache.h"
18 #include "shallow.h"
20 int option_parse_push_signed(const struct option *opt,
21 const char *arg, int unset)
23 if (unset) {
24 *(int *)(opt->value) = SEND_PACK_PUSH_CERT_NEVER;
25 return 0;
27 switch (git_parse_maybe_bool(arg)) {
28 case 1:
29 *(int *)(opt->value) = SEND_PACK_PUSH_CERT_ALWAYS;
30 return 0;
31 case 0:
32 *(int *)(opt->value) = SEND_PACK_PUSH_CERT_NEVER;
33 return 0;
35 if (!strcasecmp("if-asked", arg)) {
36 *(int *)(opt->value) = SEND_PACK_PUSH_CERT_IF_ASKED;
37 return 0;
39 die("bad %s argument: %s", opt->long_name, arg);
42 static void feed_object(const struct object_id *oid, FILE *fh, int negative)
44 if (negative &&
45 !has_object_file_with_flags(oid,
46 OBJECT_INFO_SKIP_FETCH_OBJECT |
47 OBJECT_INFO_QUICK))
48 return;
50 if (negative)
51 putc('^', fh);
52 fputs(oid_to_hex(oid), fh);
53 putc('\n', fh);
57 * Make a pack stream and spit it out into file descriptor fd
59 static int pack_objects(int fd, struct ref *refs, struct oid_array *extra, struct send_pack_args *args)
62 * The child becomes pack-objects --revs; we feed
63 * the revision parameters to it via its stdin and
64 * let its stdout go back to the other end.
66 struct child_process po = CHILD_PROCESS_INIT;
67 FILE *po_in;
68 int i;
69 int rc;
71 argv_array_push(&po.args, "pack-objects");
72 argv_array_push(&po.args, "--all-progress-implied");
73 argv_array_push(&po.args, "--revs");
74 argv_array_push(&po.args, "--stdout");
75 if (args->use_thin_pack)
76 argv_array_push(&po.args, "--thin");
77 if (args->use_ofs_delta)
78 argv_array_push(&po.args, "--delta-base-offset");
79 if (args->quiet || !args->progress)
80 argv_array_push(&po.args, "-q");
81 if (args->progress)
82 argv_array_push(&po.args, "--progress");
83 if (is_repository_shallow(the_repository))
84 argv_array_push(&po.args, "--shallow");
85 po.in = -1;
86 po.out = args->stateless_rpc ? -1 : fd;
87 po.git_cmd = 1;
88 if (start_command(&po))
89 die_errno("git pack-objects failed");
92 * We feed the pack-objects we just spawned with revision
93 * parameters by writing to the pipe.
95 po_in = xfdopen(po.in, "w");
96 for (i = 0; i < extra->nr; i++)
97 feed_object(&extra->oid[i], po_in, 1);
99 while (refs) {
100 if (!is_null_oid(&refs->old_oid))
101 feed_object(&refs->old_oid, po_in, 1);
102 if (!is_null_oid(&refs->new_oid))
103 feed_object(&refs->new_oid, po_in, 0);
104 refs = refs->next;
107 fflush(po_in);
108 if (ferror(po_in))
109 die_errno("error writing to pack-objects");
110 fclose(po_in);
112 if (args->stateless_rpc) {
113 char *buf = xmalloc(LARGE_PACKET_MAX);
114 while (1) {
115 ssize_t n = xread(po.out, buf, LARGE_PACKET_MAX);
116 if (n <= 0)
117 break;
118 send_sideband(fd, -1, buf, n, LARGE_PACKET_MAX);
120 free(buf);
121 close(po.out);
122 po.out = -1;
125 rc = finish_command(&po);
126 if (rc) {
128 * For a normal non-zero exit, we assume pack-objects wrote
129 * something useful to stderr. For death by signal, though,
130 * we should mention it to the user. The exception is SIGPIPE
131 * (141), because that's a normal occurrence if the remote end
132 * hangs up (and we'll report that by trying to read the unpack
133 * status).
135 if (rc > 128 && rc != 141)
136 error("pack-objects died of signal %d", rc - 128);
137 return -1;
139 return 0;
142 static int receive_unpack_status(struct packet_reader *reader)
144 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
145 return error(_("unexpected flush packet while reading remote unpack status"));
146 if (!skip_prefix(reader->line, "unpack ", &reader->line))
147 return error(_("unable to parse remote unpack status: %s"), reader->line);
148 if (strcmp(reader->line, "ok"))
149 return error(_("remote unpack failed: %s"), reader->line);
150 return 0;
153 static int receive_status(struct packet_reader *reader, struct ref *refs)
155 struct ref *hint;
156 int ret;
158 hint = NULL;
159 ret = receive_unpack_status(reader);
160 while (1) {
161 const char *refname;
162 char *msg;
163 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
164 break;
165 if (!starts_with(reader->line, "ok ") && !starts_with(reader->line, "ng ")) {
166 error("invalid ref status from remote: %s", reader->line);
167 ret = -1;
168 break;
171 refname = reader->line + 3;
172 msg = strchr(refname, ' ');
173 if (msg)
174 *msg++ = '\0';
176 /* first try searching at our hint, falling back to all refs */
177 if (hint)
178 hint = find_ref_by_name(hint, refname);
179 if (!hint)
180 hint = find_ref_by_name(refs, refname);
181 if (!hint) {
182 warning("remote reported status on unknown ref: %s",
183 refname);
184 continue;
186 if (hint->status != REF_STATUS_EXPECTING_REPORT) {
187 warning("remote reported status on unexpected ref: %s",
188 refname);
189 continue;
192 if (reader->line[0] == 'o' && reader->line[1] == 'k')
193 hint->status = REF_STATUS_OK;
194 else
195 hint->status = REF_STATUS_REMOTE_REJECT;
196 hint->remote_status = xstrdup_or_null(msg);
197 /* start our next search from the next ref */
198 hint = hint->next;
200 return ret;
203 static int sideband_demux(int in, int out, void *data)
205 int *fd = data, ret;
206 if (async_with_fork())
207 close(fd[1]);
208 ret = recv_sideband("send-pack", fd[0], out);
209 close(out);
210 return ret;
213 static int advertise_shallow_grafts_cb(const struct commit_graft *graft, void *cb)
215 struct strbuf *sb = cb;
216 if (graft->nr_parent == -1)
217 packet_buf_write(sb, "shallow %s\n", oid_to_hex(&graft->oid));
218 return 0;
221 static void advertise_shallow_grafts_buf(struct strbuf *sb)
223 if (!is_repository_shallow(the_repository))
224 return;
225 for_each_commit_graft(advertise_shallow_grafts_cb, sb);
228 #define CHECK_REF_NO_PUSH -1
229 #define CHECK_REF_STATUS_REJECTED -2
230 #define CHECK_REF_UPTODATE -3
231 static int check_to_send_update(const struct ref *ref, const struct send_pack_args *args)
233 if (!ref->peer_ref && !args->send_mirror)
234 return CHECK_REF_NO_PUSH;
236 /* Check for statuses set by set_ref_status_for_push() */
237 switch (ref->status) {
238 case REF_STATUS_REJECT_NONFASTFORWARD:
239 case REF_STATUS_REJECT_ALREADY_EXISTS:
240 case REF_STATUS_REJECT_FETCH_FIRST:
241 case REF_STATUS_REJECT_NEEDS_FORCE:
242 case REF_STATUS_REJECT_STALE:
243 case REF_STATUS_REJECT_NODELETE:
244 return CHECK_REF_STATUS_REJECTED;
245 case REF_STATUS_UPTODATE:
246 return CHECK_REF_UPTODATE;
247 default:
248 return 0;
253 * the beginning of the next line, or the end of buffer.
255 * NEEDSWORK: perhaps move this to git-compat-util.h or somewhere and
256 * convert many similar uses found by "git grep -A4 memchr".
258 static const char *next_line(const char *line, size_t len)
260 const char *nl = memchr(line, '\n', len);
261 if (!nl)
262 return line + len; /* incomplete line */
263 return nl + 1;
266 static int generate_push_cert(struct strbuf *req_buf,
267 const struct ref *remote_refs,
268 struct send_pack_args *args,
269 const char *cap_string,
270 const char *push_cert_nonce)
272 const struct ref *ref;
273 struct string_list_item *item;
274 char *signing_key = xstrdup(get_signing_key());
275 const char *cp, *np;
276 struct strbuf cert = STRBUF_INIT;
277 int update_seen = 0;
279 strbuf_addstr(&cert, "certificate version 0.1\n");
280 strbuf_addf(&cert, "pusher %s ", signing_key);
281 datestamp(&cert);
282 strbuf_addch(&cert, '\n');
283 if (args->url && *args->url) {
284 char *anon_url = transport_anonymize_url(args->url);
285 strbuf_addf(&cert, "pushee %s\n", anon_url);
286 free(anon_url);
288 if (push_cert_nonce[0])
289 strbuf_addf(&cert, "nonce %s\n", push_cert_nonce);
290 if (args->push_options)
291 for_each_string_list_item(item, args->push_options)
292 strbuf_addf(&cert, "push-option %s\n", item->string);
293 strbuf_addstr(&cert, "\n");
295 for (ref = remote_refs; ref; ref = ref->next) {
296 if (check_to_send_update(ref, args) < 0)
297 continue;
298 update_seen = 1;
299 strbuf_addf(&cert, "%s %s %s\n",
300 oid_to_hex(&ref->old_oid),
301 oid_to_hex(&ref->new_oid),
302 ref->name);
304 if (!update_seen)
305 goto free_return;
307 if (sign_buffer(&cert, &cert, signing_key))
308 die(_("failed to sign the push certificate"));
310 packet_buf_write(req_buf, "push-cert%c%s", 0, cap_string);
311 for (cp = cert.buf; cp < cert.buf + cert.len; cp = np) {
312 np = next_line(cp, cert.buf + cert.len - cp);
313 packet_buf_write(req_buf,
314 "%.*s", (int)(np - cp), cp);
316 packet_buf_write(req_buf, "push-cert-end\n");
318 free_return:
319 free(signing_key);
320 strbuf_release(&cert);
321 return update_seen;
324 #define NONCE_LEN_LIMIT 256
326 static void reject_invalid_nonce(const char *nonce, int len)
328 int i = 0;
330 if (NONCE_LEN_LIMIT <= len)
331 die("the receiving end asked to sign an invalid nonce <%.*s>",
332 len, nonce);
334 for (i = 0; i < len; i++) {
335 int ch = nonce[i] & 0xFF;
336 if (isalnum(ch) ||
337 ch == '-' || ch == '.' ||
338 ch == '/' || ch == '+' ||
339 ch == '=' || ch == '_')
340 continue;
341 die("the receiving end asked to sign an invalid nonce <%.*s>",
342 len, nonce);
346 int send_pack(struct send_pack_args *args,
347 int fd[], struct child_process *conn,
348 struct ref *remote_refs,
349 struct oid_array *extra_have)
351 int in = fd[0];
352 int out = fd[1];
353 struct strbuf req_buf = STRBUF_INIT;
354 struct strbuf cap_buf = STRBUF_INIT;
355 struct ref *ref;
356 int need_pack_data = 0;
357 int allow_deleting_refs = 0;
358 int status_report = 0;
359 int use_sideband = 0;
360 int quiet_supported = 0;
361 int agent_supported = 0;
362 int use_atomic = 0;
363 int atomic_supported = 0;
364 int use_push_options = 0;
365 int push_options_supported = 0;
366 int object_format_supported = 0;
367 unsigned cmds_sent = 0;
368 int ret;
369 struct async demux;
370 const char *push_cert_nonce = NULL;
371 struct packet_reader reader;
373 /* Does the other end support the reporting? */
374 if (server_supports("report-status"))
375 status_report = 1;
376 if (server_supports("delete-refs"))
377 allow_deleting_refs = 1;
378 if (server_supports("ofs-delta"))
379 args->use_ofs_delta = 1;
380 if (server_supports("side-band-64k"))
381 use_sideband = 1;
382 if (server_supports("quiet"))
383 quiet_supported = 1;
384 if (server_supports("agent"))
385 agent_supported = 1;
386 if (server_supports("no-thin"))
387 args->use_thin_pack = 0;
388 if (server_supports("atomic"))
389 atomic_supported = 1;
390 if (server_supports("push-options"))
391 push_options_supported = 1;
393 if (!server_supports_hash(the_hash_algo->name, &object_format_supported))
394 die(_("the receiving end does not support this repository's hash algorithm"));
396 if (args->push_cert != SEND_PACK_PUSH_CERT_NEVER) {
397 int len;
398 push_cert_nonce = server_feature_value("push-cert", &len);
399 if (push_cert_nonce) {
400 reject_invalid_nonce(push_cert_nonce, len);
401 push_cert_nonce = xmemdupz(push_cert_nonce, len);
402 } else if (args->push_cert == SEND_PACK_PUSH_CERT_ALWAYS) {
403 die(_("the receiving end does not support --signed push"));
404 } else if (args->push_cert == SEND_PACK_PUSH_CERT_IF_ASKED) {
405 warning(_("not sending a push certificate since the"
406 " receiving end does not support --signed"
407 " push"));
411 if (!remote_refs) {
412 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
413 "Perhaps you should specify a branch.\n");
414 return 0;
416 if (args->atomic && !atomic_supported)
417 die(_("the receiving end does not support --atomic push"));
419 use_atomic = atomic_supported && args->atomic;
421 if (args->push_options && !push_options_supported)
422 die(_("the receiving end does not support push options"));
424 use_push_options = push_options_supported && args->push_options;
426 if (status_report)
427 strbuf_addstr(&cap_buf, " report-status");
428 if (use_sideband)
429 strbuf_addstr(&cap_buf, " side-band-64k");
430 if (quiet_supported && (args->quiet || !args->progress))
431 strbuf_addstr(&cap_buf, " quiet");
432 if (use_atomic)
433 strbuf_addstr(&cap_buf, " atomic");
434 if (use_push_options)
435 strbuf_addstr(&cap_buf, " push-options");
436 if (object_format_supported)
437 strbuf_addf(&cap_buf, " object-format=%s", the_hash_algo->name);
438 if (agent_supported)
439 strbuf_addf(&cap_buf, " agent=%s", git_user_agent_sanitized());
442 * NEEDSWORK: why does delete-refs have to be so specific to
443 * send-pack machinery that set_ref_status_for_push() cannot
444 * set this bit for us???
446 for (ref = remote_refs; ref; ref = ref->next)
447 if (ref->deletion && !allow_deleting_refs)
448 ref->status = REF_STATUS_REJECT_NODELETE;
450 if (!args->dry_run)
451 advertise_shallow_grafts_buf(&req_buf);
453 if (!args->dry_run && push_cert_nonce)
454 cmds_sent = generate_push_cert(&req_buf, remote_refs, args,
455 cap_buf.buf, push_cert_nonce);
458 * Clear the status for each ref and see if we need to send
459 * the pack data.
461 for (ref = remote_refs; ref; ref = ref->next) {
462 switch (check_to_send_update(ref, args)) {
463 case 0: /* no error */
464 break;
465 case CHECK_REF_STATUS_REJECTED:
467 * When we know the server would reject a ref update if
468 * we were to send it and we're trying to send the refs
469 * atomically, abort the whole operation.
471 if (use_atomic) {
472 strbuf_release(&req_buf);
473 strbuf_release(&cap_buf);
474 reject_atomic_push(remote_refs, args->send_mirror);
475 error("atomic push failed for ref %s. status: %d\n",
476 ref->name, ref->status);
477 return args->porcelain ? 0 : -1;
479 /* else fallthrough */
480 default:
481 continue;
483 if (!ref->deletion)
484 need_pack_data = 1;
486 if (args->dry_run || !status_report)
487 ref->status = REF_STATUS_OK;
488 else
489 ref->status = REF_STATUS_EXPECTING_REPORT;
493 * Finally, tell the other end!
495 for (ref = remote_refs; ref; ref = ref->next) {
496 char *old_hex, *new_hex;
498 if (args->dry_run || push_cert_nonce)
499 continue;
501 if (check_to_send_update(ref, args) < 0)
502 continue;
504 old_hex = oid_to_hex(&ref->old_oid);
505 new_hex = oid_to_hex(&ref->new_oid);
506 if (!cmds_sent) {
507 packet_buf_write(&req_buf,
508 "%s %s %s%c%s",
509 old_hex, new_hex, ref->name, 0,
510 cap_buf.buf);
511 cmds_sent = 1;
512 } else {
513 packet_buf_write(&req_buf, "%s %s %s",
514 old_hex, new_hex, ref->name);
518 if (use_push_options) {
519 struct string_list_item *item;
521 packet_buf_flush(&req_buf);
522 for_each_string_list_item(item, args->push_options)
523 packet_buf_write(&req_buf, "%s", item->string);
526 if (args->stateless_rpc) {
527 if (!args->dry_run && (cmds_sent || is_repository_shallow(the_repository))) {
528 packet_buf_flush(&req_buf);
529 send_sideband(out, -1, req_buf.buf, req_buf.len, LARGE_PACKET_MAX);
531 } else {
532 write_or_die(out, req_buf.buf, req_buf.len);
533 packet_flush(out);
535 strbuf_release(&req_buf);
536 strbuf_release(&cap_buf);
538 if (use_sideband && cmds_sent) {
539 memset(&demux, 0, sizeof(demux));
540 demux.proc = sideband_demux;
541 demux.data = fd;
542 demux.out = -1;
543 demux.isolate_sigpipe = 1;
544 if (start_async(&demux))
545 die("send-pack: unable to fork off sideband demultiplexer");
546 in = demux.out;
549 packet_reader_init(&reader, in, NULL, 0,
550 PACKET_READ_CHOMP_NEWLINE |
551 PACKET_READ_DIE_ON_ERR_PACKET);
553 if (need_pack_data && cmds_sent) {
554 if (pack_objects(out, remote_refs, extra_have, args) < 0) {
555 if (args->stateless_rpc)
556 close(out);
557 if (git_connection_is_socket(conn))
558 shutdown(fd[0], SHUT_WR);
561 * Do not even bother with the return value; we know we
562 * are failing, and just want the error() side effects,
563 * as well as marking refs with their remote status (if
564 * we get one).
566 if (status_report)
567 receive_status(&reader, remote_refs);
569 if (use_sideband) {
570 close(demux.out);
571 finish_async(&demux);
573 fd[1] = -1;
574 return -1;
576 if (!args->stateless_rpc)
577 /* Closed by pack_objects() via start_command() */
578 fd[1] = -1;
580 if (args->stateless_rpc && cmds_sent)
581 packet_flush(out);
583 if (status_report && cmds_sent)
584 ret = receive_status(&reader, remote_refs);
585 else
586 ret = 0;
587 if (args->stateless_rpc)
588 packet_flush(out);
590 if (use_sideband && cmds_sent) {
591 close(demux.out);
592 if (finish_async(&demux)) {
593 error("error in sideband demultiplexer");
594 ret = -1;
598 if (ret < 0)
599 return ret;
601 if (args->porcelain)
602 return 0;
604 for (ref = remote_refs; ref; ref = ref->next) {
605 switch (ref->status) {
606 case REF_STATUS_NONE:
607 case REF_STATUS_UPTODATE:
608 case REF_STATUS_OK:
609 break;
610 default:
611 return -1;
614 return 0;