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 if (msg)
185 hint->remote_status = xstrdup(msg);
186 /* start our next search from the next ref */
187 hint = hint->next;
188 }
189 return ret;
190}
191static int sideband_demux(int in, int out, void *data)
193{
194 int *fd = data, ret;
195#ifdef NO_PTHREADS
196 close(fd[1]);
197#endif
198 ret = recv_sideband("send-pack", fd[0], out);
199 close(out);
200 return ret;
201}
202static int advertise_shallow_grafts_cb(const struct commit_graft *graft, void *cb)
204{
205 struct strbuf *sb = cb;
206 if (graft->nr_parent == -1)
207 packet_buf_write(sb, "shallow %s\n", oid_to_hex(&graft->oid));
208 return 0;
209}
210static void advertise_shallow_grafts_buf(struct strbuf *sb)
212{
213 if (!is_repository_shallow())
214 return;
215 for_each_commit_graft(advertise_shallow_grafts_cb, sb);
216}
217#define CHECK_REF_NO_PUSH -1
219#define CHECK_REF_STATUS_REJECTED -2
220#define CHECK_REF_UPTODATE -3
221static int check_to_send_update(const struct ref *ref, const struct send_pack_args *args)
222{
223 if (!ref->peer_ref && !args->send_mirror)
224 return CHECK_REF_NO_PUSH;
225 /* Check for statuses set by set_ref_status_for_push() */
227 switch (ref->status) {
228 case REF_STATUS_REJECT_NONFASTFORWARD:
229 case REF_STATUS_REJECT_ALREADY_EXISTS:
230 case REF_STATUS_REJECT_FETCH_FIRST:
231 case REF_STATUS_REJECT_NEEDS_FORCE:
232 case REF_STATUS_REJECT_STALE:
233 case REF_STATUS_REJECT_NODELETE:
234 return CHECK_REF_STATUS_REJECTED;
235 case REF_STATUS_UPTODATE:
236 return CHECK_REF_UPTODATE;
237 default:
238 return 0;
239 }
240}
241/*
243 * the beginning of the next line, or the end of buffer.
244 *
245 * NEEDSWORK: perhaps move this to git-compat-util.h or somewhere and
246 * convert many similar uses found by "git grep -A4 memchr".
247 */
248static const char *next_line(const char *line, size_t len)
249{
250 const char *nl = memchr(line, '\n', len);
251 if (!nl)
252 return line + len; /* incomplete line */
253 return nl + 1;
254}
255static int generate_push_cert(struct strbuf *req_buf,
257 const struct ref *remote_refs,
258 struct send_pack_args *args,
259 const char *cap_string,
260 const char *push_cert_nonce)
261{
262 const struct ref *ref;
263 struct string_list_item *item;
264 char *signing_key = xstrdup(get_signing_key());
265 const char *cp, *np;
266 struct strbuf cert = STRBUF_INIT;
267 int update_seen = 0;
268 strbuf_addstr(&cert, "certificate version 0.1\n");
270 strbuf_addf(&cert, "pusher %s ", signing_key);
271 datestamp(&cert);
272 strbuf_addch(&cert, '\n');
273 if (args->url && *args->url) {
274 char *anon_url = transport_anonymize_url(args->url);
275 strbuf_addf(&cert, "pushee %s\n", anon_url);
276 free(anon_url);
277 }
278 if (push_cert_nonce[0])
279 strbuf_addf(&cert, "nonce %s\n", push_cert_nonce);
280 if (args->push_options)
281 for_each_string_list_item(item, args->push_options)
282 strbuf_addf(&cert, "push-option %s\n", item->string);
283 strbuf_addstr(&cert, "\n");
284 for (ref = remote_refs; ref; ref = ref->next) {
286 if (check_to_send_update(ref, args) < 0)
287 continue;
288 update_seen = 1;
289 strbuf_addf(&cert, "%s %s %s\n",
290 oid_to_hex(&ref->old_oid),
291 oid_to_hex(&ref->new_oid),
292 ref->name);
293 }
294 if (!update_seen)
295 goto free_return;
296 if (sign_buffer(&cert, &cert, signing_key))
298 die(_("failed to sign the push certificate"));
299 packet_buf_write(req_buf, "push-cert%c%s", 0, cap_string);
301 for (cp = cert.buf; cp < cert.buf + cert.len; cp = np) {
302 np = next_line(cp, cert.buf + cert.len - cp);
303 packet_buf_write(req_buf,
304 "%.*s", (int)(np - cp), cp);
305 }
306 packet_buf_write(req_buf, "push-cert-end\n");
307free_return:
309 free(signing_key);
310 strbuf_release(&cert);
311 return update_seen;
312}
313static int atomic_push_failure(struct send_pack_args *args,
316 struct ref *remote_refs,
317 struct ref *failing_ref)
318{
319 struct ref *ref;
320 /* Mark other refs as failed */
321 for (ref = remote_refs; ref; ref = ref->next) {
322 if (!ref->peer_ref && !args->send_mirror)
323 continue;
324 switch (ref->status) {
326 case REF_STATUS_EXPECTING_REPORT:
327 ref->status = REF_STATUS_ATOMIC_PUSH_FAILED;
328 continue;
329 default:
330 break; /* do nothing */
331 }
332 }
333 return error("atomic push failed for ref %s. status: %d\n",
334 failing_ref->name, failing_ref->status);
335}
336#define NONCE_LEN_LIMIT 256
338static void reject_invalid_nonce(const char *nonce, int len)
340{
341 int i = 0;
342 if (NONCE_LEN_LIMIT <= len)
344 die("the receiving end asked to sign an invalid nonce <%.*s>",
345 len, nonce);
346 for (i = 0; i < len; i++) {
348 int ch = nonce[i] & 0xFF;
349 if (isalnum(ch) ||
350 ch == '-' || ch == '.' ||
351 ch == '/' || ch == '+' ||
352 ch == '=' || ch == '_')
353 continue;
354 die("the receiving end asked to sign an invalid nonce <%.*s>",
355 len, nonce);
356 }
357}
358int send_pack(struct send_pack_args *args,
360 int fd[], struct child_process *conn,
361 struct ref *remote_refs,
362 struct sha1_array *extra_have)
363{
364 int in = fd[0];
365 int out = fd[1];
366 struct strbuf req_buf = STRBUF_INIT;
367 struct strbuf cap_buf = STRBUF_INIT;
368 struct ref *ref;
369 int need_pack_data = 0;
370 int allow_deleting_refs = 0;
371 int status_report = 0;
372 int use_sideband = 0;
373 int quiet_supported = 0;
374 int agent_supported = 0;
375 int use_atomic = 0;
376 int atomic_supported = 0;
377 int use_push_options = 0;
378 int push_options_supported = 0;
379 unsigned cmds_sent = 0;
380 int ret;
381 struct async demux;
382 const char *push_cert_nonce = NULL;
383 /* Does the other end support the reporting? */
385 if (server_supports("report-status"))
386 status_report = 1;
387 if (server_supports("delete-refs"))
388 allow_deleting_refs = 1;
389 if (server_supports("ofs-delta"))
390 args->use_ofs_delta = 1;
391 if (server_supports("side-band-64k"))
392 use_sideband = 1;
393 if (server_supports("quiet"))
394 quiet_supported = 1;
395 if (server_supports("agent"))
396 agent_supported = 1;
397 if (server_supports("no-thin"))
398 args->use_thin_pack = 0;
399 if (server_supports("atomic"))
400 atomic_supported = 1;
401 if (server_supports("push-options"))
402 push_options_supported = 1;
403 if (args->push_cert != SEND_PACK_PUSH_CERT_NEVER) {
405 int len;
406 push_cert_nonce = server_feature_value("push-cert", &len);
407 if (push_cert_nonce) {
408 reject_invalid_nonce(push_cert_nonce, len);
409 push_cert_nonce = xmemdupz(push_cert_nonce, len);
410 } else if (args->push_cert == SEND_PACK_PUSH_CERT_ALWAYS) {
411 die(_("the receiving end does not support --signed push"));
412 } else if (args->push_cert == SEND_PACK_PUSH_CERT_IF_ASKED) {
413 warning(_("not sending a push certificate since the"
414 " receiving end does not support --signed"
415 " push"));
416 }
417 }
418 if (!remote_refs) {
420 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
421 "Perhaps you should specify a branch such as 'master'.\n");
422 return 0;
423 }
424 if (args->atomic && !atomic_supported)
425 die(_("the receiving end does not support --atomic push"));
426 use_atomic = atomic_supported && args->atomic;
428 if (args->push_options && !push_options_supported)
430 die(_("the receiving end does not support push options"));
431 use_push_options = push_options_supported && args->push_options;
433 if (status_report)
435 strbuf_addstr(&cap_buf, " report-status");
436 if (use_sideband)
437 strbuf_addstr(&cap_buf, " side-band-64k");
438 if (quiet_supported && (args->quiet || !args->progress))
439 strbuf_addstr(&cap_buf, " quiet");
440 if (use_atomic)
441 strbuf_addstr(&cap_buf, " atomic");
442 if (use_push_options)
443 strbuf_addstr(&cap_buf, " push-options");
444 if (agent_supported)
445 strbuf_addf(&cap_buf, " agent=%s", git_user_agent_sanitized());
446 /*
448 * NEEDSWORK: why does delete-refs have to be so specific to
449 * send-pack machinery that set_ref_status_for_push() cannot
450 * set this bit for us???
451 */
452 for (ref = remote_refs; ref; ref = ref->next)
453 if (ref->deletion && !allow_deleting_refs)
454 ref->status = REF_STATUS_REJECT_NODELETE;
455 if (!args->dry_run)
457 advertise_shallow_grafts_buf(&req_buf);
458 if (!args->dry_run && push_cert_nonce)
460 cmds_sent = generate_push_cert(&req_buf, remote_refs, args,
461 cap_buf.buf, push_cert_nonce);
462 /*
464 * Clear the status for each ref and see if we need to send
465 * the pack data.
466 */
467 for (ref = remote_refs; ref; ref = ref->next) {
468 switch (check_to_send_update(ref, args)) {
469 case 0: /* no error */
470 break;
471 case CHECK_REF_STATUS_REJECTED:
472 /*
473 * When we know the server would reject a ref update if
474 * we were to send it and we're trying to send the refs
475 * atomically, abort the whole operation.
476 */
477 if (use_atomic)
478 return atomic_push_failure(args, remote_refs, ref);
479 /* Fallthrough for non atomic case. */
480 default:
481 continue;
482 }
483 if (!ref->deletion)
484 need_pack_data = 1;
485 if (args->dry_run || !status_report)
487 ref->status = REF_STATUS_OK;
488 else
489 ref->status = REF_STATUS_EXPECTING_REPORT;
490 }
491 /*
493 * Finally, tell the other end!
494 */
495 for (ref = remote_refs; ref; ref = ref->next) {
496 char *old_hex, *new_hex;
497 if (args->dry_run || push_cert_nonce)
499 continue;
500 if (check_to_send_update(ref, args) < 0)
502 continue;
503 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);
515 }
516 }
517 if (args->stateless_rpc) {
519 if (!args->dry_run && (cmds_sent || is_repository_shallow())) {
520 packet_buf_flush(&req_buf);
521 send_sideband(out, -1, req_buf.buf, req_buf.len, LARGE_PACKET_MAX);
522 }
523 } else {
524 write_or_die(out, req_buf.buf, req_buf.len);
525 packet_flush(out);
526 }
527 strbuf_release(&req_buf);
528 strbuf_release(&cap_buf);
529 if (use_push_options) {
531 struct string_list_item *item;
532 struct strbuf sb = STRBUF_INIT;
533 for_each_string_list_item(item, args->push_options)
535 packet_buf_write(&sb, "%s", item->string);
536 write_or_die(out, sb.buf, sb.len);
538 packet_flush(out);
539 strbuf_release(&sb);
540 }
541 if (use_sideband && cmds_sent) {
543 memset(&demux, 0, sizeof(demux));
544 demux.proc = sideband_demux;
545 demux.data = fd;
546 demux.out = -1;
547 demux.isolate_sigpipe = 1;
548 if (start_async(&demux))
549 die("send-pack: unable to fork off sideband demultiplexer");
550 in = demux.out;
551 }
552 if (need_pack_data && cmds_sent) {
554 if (pack_objects(out, remote_refs, extra_have, args) < 0) {
555 for (ref = remote_refs; ref; ref = ref->next)
556 ref->status = REF_STATUS_NONE;
557 if (args->stateless_rpc)
558 close(out);
559 if (git_connection_is_socket(conn))
560 shutdown(fd[0], SHUT_WR);
561 if (use_sideband) {
562 close(demux.out);
563 finish_async(&demux);
564 }
565 fd[1] = -1;
566 return -1;
567 }
568 if (!args->stateless_rpc)
569 /* Closed by pack_objects() via start_command() */
570 fd[1] = -1;
571 }
572 if (args->stateless_rpc && cmds_sent)
573 packet_flush(out);
574 if (status_report && cmds_sent)
576 ret = receive_status(in, remote_refs);
577 else
578 ret = 0;
579 if (args->stateless_rpc)
580 packet_flush(out);
581 if (use_sideband && cmds_sent) {
583 close(demux.out);
584 if (finish_async(&demux)) {
585 error("error in sideband demultiplexer");
586 ret = -1;
587 }
588 }
589 if (ret < 0)
591 return ret;
592 if (args->porcelain)
594 return 0;
595 for (ref = remote_refs; ref; ref = ref->next) {
597 switch (ref->status) {
598 case REF_STATUS_NONE:
599 case REF_STATUS_UPTODATE:
600 case REF_STATUS_OK:
601 break;
602 default:
603 return -1;
604 }
605 }
606 return 0;
607}