Merge branch 'ds/default-pack-use-sparse-to-true'
[git.git] / send-pack.c
blob0407841ae87af99254f254b65bb53815790fec9a
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"
19 int option_parse_push_signed(const struct option *opt,
20 const char *arg, int unset)
22 if (unset) {
23 *(int *)(opt->value) = SEND_PACK_PUSH_CERT_NEVER;
24 return 0;
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;
34 if (!strcasecmp("if-asked", arg)) {
35 *(int *)(opt->value) = SEND_PACK_PUSH_CERT_IF_ASKED;
36 return 0;
38 die("bad %s argument: %s", opt->long_name, arg);
41 static void feed_object(const struct object_id *oid, FILE *fh, int negative)
43 if (negative &&
44 !has_object_file_with_flags(oid,
45 OBJECT_INFO_SKIP_FETCH_OBJECT |
46 OBJECT_INFO_QUICK))
47 return;
49 if (negative)
50 putc('^', fh);
51 fputs(oid_to_hex(oid), fh);
52 putc('\n', fh);
56 * Make a pack stream and spit it out into file descriptor fd
58 static int pack_objects(int fd, struct ref *refs, struct oid_array *extra, struct send_pack_args *args)
61 * The child becomes pack-objects --revs; we feed
62 * the revision parameters to it via its stdin and
63 * let its stdout go back to the other end.
65 struct child_process po = CHILD_PROCESS_INIT;
66 FILE *po_in;
67 int i;
68 int rc;
70 argv_array_push(&po.args, "pack-objects");
71 argv_array_push(&po.args, "--all-progress-implied");
72 argv_array_push(&po.args, "--revs");
73 argv_array_push(&po.args, "--stdout");
74 if (args->use_thin_pack)
75 argv_array_push(&po.args, "--thin");
76 if (args->use_ofs_delta)
77 argv_array_push(&po.args, "--delta-base-offset");
78 if (args->quiet || !args->progress)
79 argv_array_push(&po.args, "-q");
80 if (args->progress)
81 argv_array_push(&po.args, "--progress");
82 if (is_repository_shallow(the_repository))
83 argv_array_push(&po.args, "--shallow");
84 po.in = -1;
85 po.out = args->stateless_rpc ? -1 : fd;
86 po.git_cmd = 1;
87 if (start_command(&po))
88 die_errno("git pack-objects failed");
91 * We feed the pack-objects we just spawned with revision
92 * parameters by writing to the pipe.
94 po_in = xfdopen(po.in, "w");
95 for (i = 0; i < extra->nr; i++)
96 feed_object(&extra->oid[i], po_in, 1);
98 while (refs) {
99 if (!is_null_oid(&refs->old_oid))
100 feed_object(&refs->old_oid, po_in, 1);
101 if (!is_null_oid(&refs->new_oid))
102 feed_object(&refs->new_oid, po_in, 0);
103 refs = refs->next;
106 fflush(po_in);
107 if (ferror(po_in))
108 die_errno("error writing to pack-objects");
109 fclose(po_in);
111 if (args->stateless_rpc) {
112 char *buf = xmalloc(LARGE_PACKET_MAX);
113 while (1) {
114 ssize_t n = xread(po.out, buf, LARGE_PACKET_MAX);
115 if (n <= 0)
116 break;
117 send_sideband(fd, -1, buf, n, LARGE_PACKET_MAX);
119 free(buf);
120 close(po.out);
121 po.out = -1;
124 rc = finish_command(&po);
125 if (rc) {
127 * For a normal non-zero exit, we assume pack-objects wrote
128 * something useful to stderr. For death by signal, though,
129 * we should mention it to the user. The exception is SIGPIPE
130 * (141), because that's a normal occurrence if the remote end
131 * hangs up (and we'll report that by trying to read the unpack
132 * status).
134 if (rc > 128 && rc != 141)
135 error("pack-objects died of signal %d", rc - 128);
136 return -1;
138 return 0;
141 static int receive_unpack_status(struct packet_reader *reader)
143 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
144 return error(_("unexpected flush packet while reading remote unpack status"));
145 if (!skip_prefix(reader->line, "unpack ", &reader->line))
146 return error(_("unable to parse remote unpack status: %s"), reader->line);
147 if (strcmp(reader->line, "ok"))
148 return error(_("remote unpack failed: %s"), reader->line);
149 return 0;
152 static int receive_status(struct packet_reader *reader, struct ref *refs)
154 struct ref *hint;
155 int ret;
157 hint = NULL;
158 ret = receive_unpack_status(reader);
159 while (1) {
160 const char *refname;
161 char *msg;
162 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
163 break;
164 if (!starts_with(reader->line, "ok ") && !starts_with(reader->line, "ng ")) {
165 error("invalid ref status from remote: %s", reader->line);
166 ret = -1;
167 break;
170 refname = reader->line + 3;
171 msg = strchr(refname, ' ');
172 if (msg)
173 *msg++ = '\0';
175 /* first try searching at our hint, falling back to all refs */
176 if (hint)
177 hint = find_ref_by_name(hint, refname);
178 if (!hint)
179 hint = find_ref_by_name(refs, refname);
180 if (!hint) {
181 warning("remote reported status on unknown ref: %s",
182 refname);
183 continue;
185 if (hint->status != REF_STATUS_EXPECTING_REPORT) {
186 warning("remote reported status on unexpected ref: %s",
187 refname);
188 continue;
191 if (reader->line[0] == 'o' && reader->line[1] == 'k')
192 hint->status = REF_STATUS_OK;
193 else {
194 hint->status = REF_STATUS_REMOTE_REJECT;
195 ret = -1;
197 hint->remote_status = xstrdup_or_null(msg);
198 /* start our next search from the next ref */
199 hint = hint->next;
201 return ret;
204 static int sideband_demux(int in, int out, void *data)
206 int *fd = data, ret;
207 if (async_with_fork())
208 close(fd[1]);
209 ret = recv_sideband("send-pack", fd[0], out);
210 close(out);
211 return ret;
214 static int advertise_shallow_grafts_cb(const struct commit_graft *graft, void *cb)
216 struct strbuf *sb = cb;
217 if (graft->nr_parent == -1)
218 packet_buf_write(sb, "shallow %s\n", oid_to_hex(&graft->oid));
219 return 0;
222 static void advertise_shallow_grafts_buf(struct strbuf *sb)
224 if (!is_repository_shallow(the_repository))
225 return;
226 for_each_commit_graft(advertise_shallow_grafts_cb, sb);
229 #define CHECK_REF_NO_PUSH -1
230 #define CHECK_REF_STATUS_REJECTED -2
231 #define CHECK_REF_UPTODATE -3
232 static int check_to_send_update(const struct ref *ref, const struct send_pack_args *args)
234 if (!ref->peer_ref && !args->send_mirror)
235 return CHECK_REF_NO_PUSH;
237 /* Check for statuses set by set_ref_status_for_push() */
238 switch (ref->status) {
239 case REF_STATUS_REJECT_NONFASTFORWARD:
240 case REF_STATUS_REJECT_ALREADY_EXISTS:
241 case REF_STATUS_REJECT_FETCH_FIRST:
242 case REF_STATUS_REJECT_NEEDS_FORCE:
243 case REF_STATUS_REJECT_STALE:
244 case REF_STATUS_REJECT_NODELETE:
245 return CHECK_REF_STATUS_REJECTED;
246 case REF_STATUS_UPTODATE:
247 return CHECK_REF_UPTODATE;
248 default:
249 return 0;
254 * the beginning of the next line, or the end of buffer.
256 * NEEDSWORK: perhaps move this to git-compat-util.h or somewhere and
257 * convert many similar uses found by "git grep -A4 memchr".
259 static const char *next_line(const char *line, size_t len)
261 const char *nl = memchr(line, '\n', len);
262 if (!nl)
263 return line + len; /* incomplete line */
264 return nl + 1;
267 static int generate_push_cert(struct strbuf *req_buf,
268 const struct ref *remote_refs,
269 struct send_pack_args *args,
270 const char *cap_string,
271 const char *push_cert_nonce)
273 const struct ref *ref;
274 struct string_list_item *item;
275 char *signing_key = xstrdup(get_signing_key());
276 const char *cp, *np;
277 struct strbuf cert = STRBUF_INIT;
278 int update_seen = 0;
280 strbuf_addstr(&cert, "certificate version 0.1\n");
281 strbuf_addf(&cert, "pusher %s ", signing_key);
282 datestamp(&cert);
283 strbuf_addch(&cert, '\n');
284 if (args->url && *args->url) {
285 char *anon_url = transport_anonymize_url(args->url);
286 strbuf_addf(&cert, "pushee %s\n", anon_url);
287 free(anon_url);
289 if (push_cert_nonce[0])
290 strbuf_addf(&cert, "nonce %s\n", push_cert_nonce);
291 if (args->push_options)
292 for_each_string_list_item(item, args->push_options)
293 strbuf_addf(&cert, "push-option %s\n", item->string);
294 strbuf_addstr(&cert, "\n");
296 for (ref = remote_refs; ref; ref = ref->next) {
297 if (check_to_send_update(ref, args) < 0)
298 continue;
299 update_seen = 1;
300 strbuf_addf(&cert, "%s %s %s\n",
301 oid_to_hex(&ref->old_oid),
302 oid_to_hex(&ref->new_oid),
303 ref->name);
305 if (!update_seen)
306 goto free_return;
308 if (sign_buffer(&cert, &cert, signing_key))
309 die(_("failed to sign the push certificate"));
311 packet_buf_write(req_buf, "push-cert%c%s", 0, cap_string);
312 for (cp = cert.buf; cp < cert.buf + cert.len; cp = np) {
313 np = next_line(cp, cert.buf + cert.len - cp);
314 packet_buf_write(req_buf,
315 "%.*s", (int)(np - cp), cp);
317 packet_buf_write(req_buf, "push-cert-end\n");
319 free_return:
320 free(signing_key);
321 strbuf_release(&cert);
322 return update_seen;
326 static int atomic_push_failure(struct send_pack_args *args,
327 struct ref *remote_refs,
328 struct ref *failing_ref)
330 struct ref *ref;
331 /* Mark other refs as failed */
332 for (ref = remote_refs; ref; ref = ref->next) {
333 if (!ref->peer_ref && !args->send_mirror)
334 continue;
336 switch (ref->status) {
337 case REF_STATUS_EXPECTING_REPORT:
338 ref->status = REF_STATUS_ATOMIC_PUSH_FAILED;
339 continue;
340 default:
341 break; /* do nothing */
344 return error("atomic push failed for ref %s. status: %d\n",
345 failing_ref->name, failing_ref->status);
348 #define NONCE_LEN_LIMIT 256
350 static void reject_invalid_nonce(const char *nonce, int len)
352 int i = 0;
354 if (NONCE_LEN_LIMIT <= len)
355 die("the receiving end asked to sign an invalid nonce <%.*s>",
356 len, nonce);
358 for (i = 0; i < len; i++) {
359 int ch = nonce[i] & 0xFF;
360 if (isalnum(ch) ||
361 ch == '-' || ch == '.' ||
362 ch == '/' || ch == '+' ||
363 ch == '=' || ch == '_')
364 continue;
365 die("the receiving end asked to sign an invalid nonce <%.*s>",
366 len, nonce);
370 int send_pack(struct send_pack_args *args,
371 int fd[], struct child_process *conn,
372 struct ref *remote_refs,
373 struct oid_array *extra_have)
375 int in = fd[0];
376 int out = fd[1];
377 struct strbuf req_buf = STRBUF_INIT;
378 struct strbuf cap_buf = STRBUF_INIT;
379 struct ref *ref;
380 int need_pack_data = 0;
381 int allow_deleting_refs = 0;
382 int status_report = 0;
383 int use_sideband = 0;
384 int quiet_supported = 0;
385 int agent_supported = 0;
386 int use_atomic = 0;
387 int atomic_supported = 0;
388 int use_push_options = 0;
389 int push_options_supported = 0;
390 unsigned cmds_sent = 0;
391 int ret;
392 struct async demux;
393 const char *push_cert_nonce = NULL;
394 struct packet_reader reader;
396 /* Does the other end support the reporting? */
397 if (server_supports("report-status"))
398 status_report = 1;
399 if (server_supports("delete-refs"))
400 allow_deleting_refs = 1;
401 if (server_supports("ofs-delta"))
402 args->use_ofs_delta = 1;
403 if (server_supports("side-band-64k"))
404 use_sideband = 1;
405 if (server_supports("quiet"))
406 quiet_supported = 1;
407 if (server_supports("agent"))
408 agent_supported = 1;
409 if (server_supports("no-thin"))
410 args->use_thin_pack = 0;
411 if (server_supports("atomic"))
412 atomic_supported = 1;
413 if (server_supports("push-options"))
414 push_options_supported = 1;
416 if (args->push_cert != SEND_PACK_PUSH_CERT_NEVER) {
417 int len;
418 push_cert_nonce = server_feature_value("push-cert", &len);
419 if (push_cert_nonce) {
420 reject_invalid_nonce(push_cert_nonce, len);
421 push_cert_nonce = xmemdupz(push_cert_nonce, len);
422 } else if (args->push_cert == SEND_PACK_PUSH_CERT_ALWAYS) {
423 die(_("the receiving end does not support --signed push"));
424 } else if (args->push_cert == SEND_PACK_PUSH_CERT_IF_ASKED) {
425 warning(_("not sending a push certificate since the"
426 " receiving end does not support --signed"
427 " push"));
431 if (!remote_refs) {
432 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
433 "Perhaps you should specify a branch such as 'master'.\n");
434 return 0;
436 if (args->atomic && !atomic_supported)
437 die(_("the receiving end does not support --atomic push"));
439 use_atomic = atomic_supported && args->atomic;
441 if (args->push_options && !push_options_supported)
442 die(_("the receiving end does not support push options"));
444 use_push_options = push_options_supported && args->push_options;
446 if (status_report)
447 strbuf_addstr(&cap_buf, " report-status");
448 if (use_sideband)
449 strbuf_addstr(&cap_buf, " side-band-64k");
450 if (quiet_supported && (args->quiet || !args->progress))
451 strbuf_addstr(&cap_buf, " quiet");
452 if (use_atomic)
453 strbuf_addstr(&cap_buf, " atomic");
454 if (use_push_options)
455 strbuf_addstr(&cap_buf, " push-options");
456 if (agent_supported)
457 strbuf_addf(&cap_buf, " agent=%s", git_user_agent_sanitized());
460 * NEEDSWORK: why does delete-refs have to be so specific to
461 * send-pack machinery that set_ref_status_for_push() cannot
462 * set this bit for us???
464 for (ref = remote_refs; ref; ref = ref->next)
465 if (ref->deletion && !allow_deleting_refs)
466 ref->status = REF_STATUS_REJECT_NODELETE;
468 if (!args->dry_run)
469 advertise_shallow_grafts_buf(&req_buf);
471 if (!args->dry_run && push_cert_nonce)
472 cmds_sent = generate_push_cert(&req_buf, remote_refs, args,
473 cap_buf.buf, push_cert_nonce);
476 * Clear the status for each ref and see if we need to send
477 * the pack data.
479 for (ref = remote_refs; ref; ref = ref->next) {
480 switch (check_to_send_update(ref, args)) {
481 case 0: /* no error */
482 break;
483 case CHECK_REF_STATUS_REJECTED:
485 * When we know the server would reject a ref update if
486 * we were to send it and we're trying to send the refs
487 * atomically, abort the whole operation.
489 if (use_atomic) {
490 strbuf_release(&req_buf);
491 strbuf_release(&cap_buf);
492 return atomic_push_failure(args, remote_refs, ref);
494 /* else fallthrough */
495 default:
496 continue;
498 if (!ref->deletion)
499 need_pack_data = 1;
501 if (args->dry_run || !status_report)
502 ref->status = REF_STATUS_OK;
503 else
504 ref->status = REF_STATUS_EXPECTING_REPORT;
508 * Finally, tell the other end!
510 for (ref = remote_refs; ref; ref = ref->next) {
511 char *old_hex, *new_hex;
513 if (args->dry_run || push_cert_nonce)
514 continue;
516 if (check_to_send_update(ref, args) < 0)
517 continue;
519 old_hex = oid_to_hex(&ref->old_oid);
520 new_hex = oid_to_hex(&ref->new_oid);
521 if (!cmds_sent) {
522 packet_buf_write(&req_buf,
523 "%s %s %s%c%s",
524 old_hex, new_hex, ref->name, 0,
525 cap_buf.buf);
526 cmds_sent = 1;
527 } else {
528 packet_buf_write(&req_buf, "%s %s %s",
529 old_hex, new_hex, ref->name);
533 if (use_push_options) {
534 struct string_list_item *item;
536 packet_buf_flush(&req_buf);
537 for_each_string_list_item(item, args->push_options)
538 packet_buf_write(&req_buf, "%s", item->string);
541 if (args->stateless_rpc) {
542 if (!args->dry_run && (cmds_sent || is_repository_shallow(the_repository))) {
543 packet_buf_flush(&req_buf);
544 send_sideband(out, -1, req_buf.buf, req_buf.len, LARGE_PACKET_MAX);
546 } else {
547 write_or_die(out, req_buf.buf, req_buf.len);
548 packet_flush(out);
550 strbuf_release(&req_buf);
551 strbuf_release(&cap_buf);
553 if (use_sideband && cmds_sent) {
554 memset(&demux, 0, sizeof(demux));
555 demux.proc = sideband_demux;
556 demux.data = fd;
557 demux.out = -1;
558 demux.isolate_sigpipe = 1;
559 if (start_async(&demux))
560 die("send-pack: unable to fork off sideband demultiplexer");
561 in = demux.out;
564 packet_reader_init(&reader, in, NULL, 0,
565 PACKET_READ_CHOMP_NEWLINE |
566 PACKET_READ_DIE_ON_ERR_PACKET);
568 if (need_pack_data && cmds_sent) {
569 if (pack_objects(out, remote_refs, extra_have, args) < 0) {
570 if (args->stateless_rpc)
571 close(out);
572 if (git_connection_is_socket(conn))
573 shutdown(fd[0], SHUT_WR);
576 * Do not even bother with the return value; we know we
577 * are failing, and just want the error() side effects,
578 * as well as marking refs with their remote status (if
579 * we get one).
581 if (status_report)
582 receive_status(&reader, remote_refs);
584 if (use_sideband) {
585 close(demux.out);
586 finish_async(&demux);
588 fd[1] = -1;
589 return -1;
591 if (!args->stateless_rpc)
592 /* Closed by pack_objects() via start_command() */
593 fd[1] = -1;
595 if (args->stateless_rpc && cmds_sent)
596 packet_flush(out);
598 if (status_report && cmds_sent)
599 ret = receive_status(&reader, remote_refs);
600 else
601 ret = 0;
602 if (args->stateless_rpc)
603 packet_flush(out);
605 if (use_sideband && cmds_sent) {
606 close(demux.out);
607 if (finish_async(&demux)) {
608 error("error in sideband demultiplexer");
609 ret = -1;
613 if (ret < 0)
614 return ret;
616 if (args->porcelain)
617 return 0;
619 for (ref = remote_refs; ref; ref = ref->next) {
620 switch (ref->status) {
621 case REF_STATUS_NONE:
622 case REF_STATUS_UPTODATE:
623 case REF_STATUS_OK:
624 break;
625 default:
626 return -1;
629 return 0;