1#include "builtin.h"
2#include "commit.h"
3#include "refs.h"
4#include "pkt-line.h"
5#include "sideband.h"
6#include "run-command.h"
7#include "remote.h"
8#include "connect.h"
9#include "send-pack.h"
10#include "quote.h"
11#include "transport.h"
12#include "version.h"
13#include "sha1-array.h"
14#include "gpg-interface.h"
15#include "cache.h"
16int option_parse_push_signed(const struct option *opt,
18 const char *arg, int unset)
19{
20 if (unset) {
21 *(int *)(opt->value) = SEND_PACK_PUSH_CERT_NEVER;
22 return 0;
23 }
24 switch (git_parse_maybe_bool(arg)) {
25 case 1:
26 *(int *)(opt->value) = SEND_PACK_PUSH_CERT_ALWAYS;
27 return 0;
28 case 0:
29 *(int *)(opt->value) = SEND_PACK_PUSH_CERT_NEVER;
30 return 0;
31 }
32 if (!strcasecmp("if-asked", arg)) {
33 *(int *)(opt->value) = SEND_PACK_PUSH_CERT_IF_ASKED;
34 return 0;
35 }
36 die("bad %s argument: %s", opt->long_name, arg);
37}
38static void feed_object(const unsigned char *sha1, FILE *fh, int negative)
40{
41 if (negative && !has_sha1_file(sha1))
42 return;
43 if (negative)
45 putc('^', fh);
46 fputs(sha1_to_hex(sha1), fh);
47 putc('\n', fh);
48}
49/*
51 * Make a pack stream and spit it out into file descriptor fd
52 */
53static int pack_objects(int fd, struct ref *refs, struct sha1_array *extra, struct send_pack_args *args)
54{
55 /*
56 * The child becomes pack-objects --revs; we feed
57 * the revision parameters to it via its stdin and
58 * let its stdout go back to the other end.
59 */
60 const char *argv[] = {
61 "pack-objects",
62 "--all-progress-implied",
63 "--revs",
64 "--stdout",
65 NULL,
66 NULL,
67 NULL,
68 NULL,
69 NULL,
70 NULL,
71 };
72 struct child_process po = CHILD_PROCESS_INIT;
73 FILE *po_in;
74 int i;
75 i = 4;
77 if (args->use_thin_pack)
78 argv[i++] = "--thin";
79 if (args->use_ofs_delta)
80 argv[i++] = "--delta-base-offset";
81 if (args->quiet || !args->progress)
82 argv[i++] = "-q";
83 if (args->progress)
84 argv[i++] = "--progress";
85 if (is_repository_shallow())
86 argv[i++] = "--shallow";
87 po.argv = argv;
88 po.in = -1;
89 po.out = args->stateless_rpc ? -1 : fd;
90 po.git_cmd = 1;
91 if (start_command(&po))
92 die_errno("git pack-objects failed");
93 /*
95 * We feed the pack-objects we just spawned with revision
96 * parameters by writing to the pipe.
97 */
98 po_in = xfdopen(po.in, "w");
99 for (i = 0; i < extra->nr; i++)
100 feed_object(extra->sha1[i], po_in, 1);
101 while (refs) {
103 if (!is_null_oid(&refs->old_oid))
104 feed_object(refs->old_oid.hash, po_in, 1);
105 if (!is_null_oid(&refs->new_oid))
106 feed_object(refs->new_oid.hash, po_in, 0);
107 refs = refs->next;
108 }
109 fflush(po_in);
111 if (ferror(po_in))
112 die_errno("error writing to pack-objects");
113 fclose(po_in);
114 if (args->stateless_rpc) {
116 char *buf = xmalloc(LARGE_PACKET_MAX);
117 while (1) {
118 ssize_t n = xread(po.out, buf, LARGE_PACKET_MAX);
119 if (n <= 0)
120 break;
121 send_sideband(fd, -1, buf, n, LARGE_PACKET_MAX);
122 }
123 free(buf);
124 close(po.out);
125 po.out = -1;
126 }
127 if (finish_command(&po))
129 return -1;
130 return 0;
131}
132static int receive_status(int in, struct ref *refs)
134{
135 struct ref *hint;
136 int ret = 0;
137 char *line = packet_read_line(in, NULL);
138 if (!starts_with(line, "unpack "))
139 return error("did not receive remote status");
140 if (strcmp(line, "unpack ok")) {
141 error("unpack failed: %s", line + 7);
142 ret = -1;
143 }
144 hint = NULL;
145 while (1) {
146 char *refname;
147 char *msg;
148 line = packet_read_line(in, NULL);
149 if (!line)
150 break;
151 if (!starts_with(line, "ok ") && !starts_with(line, "ng ")) {
152 error("invalid ref status from remote: %s", line);
153 ret = -1;
154 break;
155 }
156 refname = line + 3;
158 msg = strchr(refname, ' ');
159 if (msg)
160 *msg++ = '\0';
161 /* first try searching at our hint, falling back to all refs */
163 if (hint)
164 hint = find_ref_by_name(hint, refname);
165 if (!hint)
166 hint = find_ref_by_name(refs, refname);
167 if (!hint) {
168 warning("remote reported status on unknown ref: %s",
169 refname);
170 continue;
171 }
172 if (hint->status != REF_STATUS_EXPECTING_REPORT) {
173 warning("remote reported status on unexpected ref: %s",
174 refname);
175 continue;
176 }
177 if (line[0] == 'o' && line[1] == 'k')
179 hint->status = REF_STATUS_OK;
180 else {
181 hint->status = REF_STATUS_REMOTE_REJECT;
182 ret = -1;
183 }
184 hint->remote_status = xstrdup_or_null(msg);
185 /* start our next search from the next ref */
186 hint = hint->next;
187 }
188 return ret;
189}
190static int sideband_demux(int in, int out, void *data)
192{
193 int *fd = data, ret;
194#ifdef NO_PTHREADS
195 close(fd[1]);
196#endif
197 ret = recv_sideband("send-pack", fd[0], out);
198 close(out);
199 return ret;
200}
201static int advertise_shallow_grafts_cb(const struct commit_graft *graft, void *cb)
203{
204 struct strbuf *sb = cb;
205 if (graft->nr_parent == -1)
206 packet_buf_write(sb, "shallow %s\n", oid_to_hex(&graft->oid));
207 return 0;
208}
209static void advertise_shallow_grafts_buf(struct strbuf *sb)
211{
212 if (!is_repository_shallow())
213 return;
214 for_each_commit_graft(advertise_shallow_grafts_cb, sb);
215}
216#define CHECK_REF_NO_PUSH -1
218#define CHECK_REF_STATUS_REJECTED -2
219#define CHECK_REF_UPTODATE -3
220static int check_to_send_update(const struct ref *ref, const struct send_pack_args *args)
221{
222 if (!ref->peer_ref && !args->send_mirror)
223 return CHECK_REF_NO_PUSH;
224 /* Check for statuses set by set_ref_status_for_push() */
226 switch (ref->status) {
227 case REF_STATUS_REJECT_NONFASTFORWARD:
228 case REF_STATUS_REJECT_ALREADY_EXISTS:
229 case REF_STATUS_REJECT_FETCH_FIRST:
230 case REF_STATUS_REJECT_NEEDS_FORCE:
231 case REF_STATUS_REJECT_STALE:
232 case REF_STATUS_REJECT_NODELETE:
233 return CHECK_REF_STATUS_REJECTED;
234 case REF_STATUS_UPTODATE:
235 return CHECK_REF_UPTODATE;
236 default:
237 return 0;
238 }
239}
240/*
242 * the beginning of the next line, or the end of buffer.
243 *
244 * NEEDSWORK: perhaps move this to git-compat-util.h or somewhere and
245 * convert many similar uses found by "git grep -A4 memchr".
246 */
247static const char *next_line(const char *line, size_t len)
248{
249 const char *nl = memchr(line, '\n', len);
250 if (!nl)
251 return line + len; /* incomplete line */
252 return nl + 1;
253}
254static int generate_push_cert(struct strbuf *req_buf,
256 const struct ref *remote_refs,
257 struct send_pack_args *args,
258 const char *cap_string,
259 const char *push_cert_nonce)
260{
261 const struct ref *ref;
262 struct string_list_item *item;
263 char *signing_key = xstrdup(get_signing_key());
264 const char *cp, *np;
265 struct strbuf cert = STRBUF_INIT;
266 int update_seen = 0;
267 strbuf_addstr(&cert, "certificate version 0.1\n");
269 strbuf_addf(&cert, "pusher %s ", signing_key);
270 datestamp(&cert);
271 strbuf_addch(&cert, '\n');
272 if (args->url && *args->url) {
273 char *anon_url = transport_anonymize_url(args->url);
274 strbuf_addf(&cert, "pushee %s\n", anon_url);
275 free(anon_url);
276 }
277 if (push_cert_nonce[0])
278 strbuf_addf(&cert, "nonce %s\n", push_cert_nonce);
279 if (args->push_options)
280 for_each_string_list_item(item, args->push_options)
281 strbuf_addf(&cert, "push-option %s\n", item->string);
282 strbuf_addstr(&cert, "\n");
283 for (ref = remote_refs; ref; ref = ref->next) {
285 if (check_to_send_update(ref, args) < 0)
286 continue;
287 update_seen = 1;
288 strbuf_addf(&cert, "%s %s %s\n",
289 oid_to_hex(&ref->old_oid),
290 oid_to_hex(&ref->new_oid),
291 ref->name);
292 }
293 if (!update_seen)
294 goto free_return;
295 if (sign_buffer(&cert, &cert, signing_key))
297 die(_("failed to sign the push certificate"));
298 packet_buf_write(req_buf, "push-cert%c%s", 0, cap_string);
300 for (cp = cert.buf; cp < cert.buf + cert.len; cp = np) {
301 np = next_line(cp, cert.buf + cert.len - cp);
302 packet_buf_write(req_buf,
303 "%.*s", (int)(np - cp), cp);
304 }
305 packet_buf_write(req_buf, "push-cert-end\n");
306free_return:
308 free(signing_key);
309 strbuf_release(&cert);
310 return update_seen;
311}
312static int atomic_push_failure(struct send_pack_args *args,
315 struct ref *remote_refs,
316 struct ref *failing_ref)
317{
318 struct ref *ref;
319 /* Mark other refs as failed */
320 for (ref = remote_refs; ref; ref = ref->next) {
321 if (!ref->peer_ref && !args->send_mirror)
322 continue;
323 switch (ref->status) {
325 case REF_STATUS_EXPECTING_REPORT:
326 ref->status = REF_STATUS_ATOMIC_PUSH_FAILED;
327 continue;
328 default:
329 break; /* do nothing */
330 }
331 }
332 return error("atomic push failed for ref %s. status: %d\n",
333 failing_ref->name, failing_ref->status);
334}
335#define NONCE_LEN_LIMIT 256
337static void reject_invalid_nonce(const char *nonce, int len)
339{
340 int i = 0;
341 if (NONCE_LEN_LIMIT <= len)
343 die("the receiving end asked to sign an invalid nonce <%.*s>",
344 len, nonce);
345 for (i = 0; i < len; i++) {
347 int ch = nonce[i] & 0xFF;
348 if (isalnum(ch) ||
349 ch == '-' || ch == '.' ||
350 ch == '/' || ch == '+' ||
351 ch == '=' || ch == '_')
352 continue;
353 die("the receiving end asked to sign an invalid nonce <%.*s>",
354 len, nonce);
355 }
356}
357int send_pack(struct send_pack_args *args,
359 int fd[], struct child_process *conn,
360 struct ref *remote_refs,
361 struct sha1_array *extra_have)
362{
363 int in = fd[0];
364 int out = fd[1];
365 struct strbuf req_buf = STRBUF_INIT;
366 struct strbuf cap_buf = STRBUF_INIT;
367 struct ref *ref;
368 int need_pack_data = 0;
369 int allow_deleting_refs = 0;
370 int status_report = 0;
371 int use_sideband = 0;
372 int quiet_supported = 0;
373 int agent_supported = 0;
374 int use_atomic = 0;
375 int atomic_supported = 0;
376 int use_push_options = 0;
377 int push_options_supported = 0;
378 unsigned cmds_sent = 0;
379 int ret;
380 struct async demux;
381 const char *push_cert_nonce = NULL;
382 /* Does the other end support the reporting? */
384 if (server_supports("report-status"))
385 status_report = 1;
386 if (server_supports("delete-refs"))
387 allow_deleting_refs = 1;
388 if (server_supports("ofs-delta"))
389 args->use_ofs_delta = 1;
390 if (server_supports("side-band-64k"))
391 use_sideband = 1;
392 if (server_supports("quiet"))
393 quiet_supported = 1;
394 if (server_supports("agent"))
395 agent_supported = 1;
396 if (server_supports("no-thin"))
397 args->use_thin_pack = 0;
398 if (server_supports("atomic"))
399 atomic_supported = 1;
400 if (server_supports("push-options"))
401 push_options_supported = 1;
402 if (args->push_cert != SEND_PACK_PUSH_CERT_NEVER) {
404 int len;
405 push_cert_nonce = server_feature_value("push-cert", &len);
406 if (push_cert_nonce) {
407 reject_invalid_nonce(push_cert_nonce, len);
408 push_cert_nonce = xmemdupz(push_cert_nonce, len);
409 } else if (args->push_cert == SEND_PACK_PUSH_CERT_ALWAYS) {
410 die(_("the receiving end does not support --signed push"));
411 } else if (args->push_cert == SEND_PACK_PUSH_CERT_IF_ASKED) {
412 warning(_("not sending a push certificate since the"
413 " receiving end does not support --signed"
414 " push"));
415 }
416 }
417 if (!remote_refs) {
419 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
420 "Perhaps you should specify a branch such as 'master'.\n");
421 return 0;
422 }
423 if (args->atomic && !atomic_supported)
424 die(_("the receiving end does not support --atomic push"));
425 use_atomic = atomic_supported && args->atomic;
427 if (args->push_options && !push_options_supported)
429 die(_("the receiving end does not support push options"));
430 use_push_options = push_options_supported && args->push_options;
432 if (status_report)
434 strbuf_addstr(&cap_buf, " report-status");
435 if (use_sideband)
436 strbuf_addstr(&cap_buf, " side-band-64k");
437 if (quiet_supported && (args->quiet || !args->progress))
438 strbuf_addstr(&cap_buf, " quiet");
439 if (use_atomic)
440 strbuf_addstr(&cap_buf, " atomic");
441 if (use_push_options)
442 strbuf_addstr(&cap_buf, " push-options");
443 if (agent_supported)
444 strbuf_addf(&cap_buf, " agent=%s", git_user_agent_sanitized());
445 /*
447 * NEEDSWORK: why does delete-refs have to be so specific to
448 * send-pack machinery that set_ref_status_for_push() cannot
449 * set this bit for us???
450 */
451 for (ref = remote_refs; ref; ref = ref->next)
452 if (ref->deletion && !allow_deleting_refs)
453 ref->status = REF_STATUS_REJECT_NODELETE;
454 if (!args->dry_run)
456 advertise_shallow_grafts_buf(&req_buf);
457 if (!args->dry_run && push_cert_nonce)
459 cmds_sent = generate_push_cert(&req_buf, remote_refs, args,
460 cap_buf.buf, push_cert_nonce);
461 /*
463 * Clear the status for each ref and see if we need to send
464 * the pack data.
465 */
466 for (ref = remote_refs; ref; ref = ref->next) {
467 switch (check_to_send_update(ref, args)) {
468 case 0: /* no error */
469 break;
470 case CHECK_REF_STATUS_REJECTED:
471 /*
472 * When we know the server would reject a ref update if
473 * we were to send it and we're trying to send the refs
474 * atomically, abort the whole operation.
475 */
476 if (use_atomic)
477 return atomic_push_failure(args, remote_refs, ref);
478 /* Fallthrough for non atomic case. */
479 default:
480 continue;
481 }
482 if (!ref->deletion)
483 need_pack_data = 1;
484 if (args->dry_run || !status_report)
486 ref->status = REF_STATUS_OK;
487 else
488 ref->status = REF_STATUS_EXPECTING_REPORT;
489 }
490 /*
492 * Finally, tell the other end!
493 */
494 for (ref = remote_refs; ref; ref = ref->next) {
495 char *old_hex, *new_hex;
496 if (args->dry_run || push_cert_nonce)
498 continue;
499 if (check_to_send_update(ref, args) < 0)
501 continue;
502 old_hex = oid_to_hex(&ref->old_oid);
504 new_hex = oid_to_hex(&ref->new_oid);
505 if (!cmds_sent) {
506 packet_buf_write(&req_buf,
507 "%s %s %s%c%s",
508 old_hex, new_hex, ref->name, 0,
509 cap_buf.buf);
510 cmds_sent = 1;
511 } else {
512 packet_buf_write(&req_buf, "%s %s %s",
513 old_hex, new_hex, ref->name);
514 }
515 }
516 if (args->stateless_rpc) {
518 if (!args->dry_run && (cmds_sent || is_repository_shallow())) {
519 packet_buf_flush(&req_buf);
520 send_sideband(out, -1, req_buf.buf, req_buf.len, LARGE_PACKET_MAX);
521 }
522 } else {
523 write_or_die(out, req_buf.buf, req_buf.len);
524 packet_flush(out);
525 }
526 strbuf_release(&req_buf);
527 strbuf_release(&cap_buf);
528 if (use_push_options) {
530 struct string_list_item *item;
531 struct strbuf sb = STRBUF_INIT;
532 for_each_string_list_item(item, args->push_options)
534 packet_buf_write(&sb, "%s", item->string);
535 write_or_die(out, sb.buf, sb.len);
537 packet_flush(out);
538 strbuf_release(&sb);
539 }
540 if (use_sideband && cmds_sent) {
542 memset(&demux, 0, sizeof(demux));
543 demux.proc = sideband_demux;
544 demux.data = fd;
545 demux.out = -1;
546 demux.isolate_sigpipe = 1;
547 if (start_async(&demux))
548 die("send-pack: unable to fork off sideband demultiplexer");
549 in = demux.out;
550 }
551 if (need_pack_data && cmds_sent) {
553 if (pack_objects(out, remote_refs, extra_have, args) < 0) {
554 for (ref = remote_refs; ref; ref = ref->next)
555 ref->status = REF_STATUS_NONE;
556 if (args->stateless_rpc)
557 close(out);
558 if (git_connection_is_socket(conn))
559 shutdown(fd[0], SHUT_WR);
560 if (use_sideband) {
561 close(demux.out);
562 finish_async(&demux);
563 }
564 fd[1] = -1;
565 return -1;
566 }
567 if (!args->stateless_rpc)
568 /* Closed by pack_objects() via start_command() */
569 fd[1] = -1;
570 }
571 if (args->stateless_rpc && cmds_sent)
572 packet_flush(out);
573 if (status_report && cmds_sent)
575 ret = receive_status(in, remote_refs);
576 else
577 ret = 0;
578 if (args->stateless_rpc)
579 packet_flush(out);
580 if (use_sideband && cmds_sent) {
582 close(demux.out);
583 if (finish_async(&demux)) {
584 error("error in sideband demultiplexer");
585 ret = -1;
586 }
587 }
588 if (ret < 0)
590 return ret;
591 if (args->porcelain)
593 return 0;
594 for (ref = remote_refs; ref; ref = ref->next) {
596 switch (ref->status) {
597 case REF_STATUS_NONE:
598 case REF_STATUS_UPTODATE:
599 case REF_STATUS_OK:
600 break;
601 default:
602 return -1;
603 }
604 }
605 return 0;
606}