1#include "builtin.h"
2#include "config.h"
3#include "commit.h"
4#include "refs.h"
5#include "pkt-line.h"
6#include "sideband.h"
7#include "run-command.h"
8#include "remote.h"
9#include "connect.h"
10#include "send-pack.h"
11#include "quote.h"
12#include "transport.h"
13#include "version.h"
14#include "sha1-array.h"
15#include "gpg-interface.h"
16#include "cache.h"
17int option_parse_push_signed(const struct option *opt,
19 const char *arg, int unset)
20{
21 if (unset) {
22 *(int *)(opt->value) = SEND_PACK_PUSH_CERT_NEVER;
23 return 0;
24 }
25 switch (git_parse_maybe_bool(arg)) {
26 case 1:
27 *(int *)(opt->value) = SEND_PACK_PUSH_CERT_ALWAYS;
28 return 0;
29 case 0:
30 *(int *)(opt->value) = SEND_PACK_PUSH_CERT_NEVER;
31 return 0;
32 }
33 if (!strcasecmp("if-asked", arg)) {
34 *(int *)(opt->value) = SEND_PACK_PUSH_CERT_IF_ASKED;
35 return 0;
36 }
37 die("bad %s argument: %s", opt->long_name, arg);
38}
39static void feed_object(const unsigned char *sha1, FILE *fh, int negative)
41{
42 if (negative && !has_sha1_file(sha1))
43 return;
44 if (negative)
46 putc('^', fh);
47 fputs(sha1_to_hex(sha1), fh);
48 putc('\n', fh);
49}
50/*
52 * Make a pack stream and spit it out into file descriptor fd
53 */
54static int pack_objects(int fd, struct ref *refs, struct oid_array *extra, struct send_pack_args *args)
55{
56 /*
57 * The child becomes pack-objects --revs; we feed
58 * the revision parameters to it via its stdin and
59 * let its stdout go back to the other end.
60 */
61 struct child_process po = CHILD_PROCESS_INIT;
62 FILE *po_in;
63 int i;
64 int rc;
65 argv_array_push(&po.args, "pack-objects");
67 argv_array_push(&po.args, "--all-progress-implied");
68 argv_array_push(&po.args, "--revs");
69 argv_array_push(&po.args, "--stdout");
70 if (args->use_thin_pack)
71 argv_array_push(&po.args, "--thin");
72 if (args->use_ofs_delta)
73 argv_array_push(&po.args, "--delta-base-offset");
74 if (args->quiet || !args->progress)
75 argv_array_push(&po.args, "-q");
76 if (args->progress)
77 argv_array_push(&po.args, "--progress");
78 if (is_repository_shallow())
79 argv_array_push(&po.args, "--shallow");
80 po.in = -1;
81 po.out = args->stateless_rpc ? -1 : fd;
82 po.git_cmd = 1;
83 if (start_command(&po))
84 die_errno("git pack-objects failed");
85 /*
87 * We feed the pack-objects we just spawned with revision
88 * parameters by writing to the pipe.
89 */
90 po_in = xfdopen(po.in, "w");
91 for (i = 0; i < extra->nr; i++)
92 feed_object(extra->oid[i].hash, po_in, 1);
93 while (refs) {
95 if (!is_null_oid(&refs->old_oid))
96 feed_object(refs->old_oid.hash, po_in, 1);
97 if (!is_null_oid(&refs->new_oid))
98 feed_object(refs->new_oid.hash, po_in, 0);
99 refs = refs->next;
100 }
101 fflush(po_in);
103 if (ferror(po_in))
104 die_errno("error writing to pack-objects");
105 fclose(po_in);
106 if (args->stateless_rpc) {
108 char *buf = xmalloc(LARGE_PACKET_MAX);
109 while (1) {
110 ssize_t n = xread(po.out, buf, LARGE_PACKET_MAX);
111 if (n <= 0)
112 break;
113 send_sideband(fd, -1, buf, n, LARGE_PACKET_MAX);
114 }
115 free(buf);
116 close(po.out);
117 po.out = -1;
118 }
119 rc = finish_command(&po);
121 if (rc) {
122 /*
123 * For a normal non-zero exit, we assume pack-objects wrote
124 * something useful to stderr. For death by signal, though,
125 * we should mention it to the user. The exception is SIGPIPE
126 * (141), because that's a normal occurrence if the remote end
127 * hangs up (and we'll report that by trying to read the unpack
128 * status).
129 */
130 if (rc > 128 && rc != 141)
131 error("pack-objects died of signal %d", rc - 128);
132 return -1;
133 }
134 return 0;
135}
136static int receive_unpack_status(int in)
138{
139 const char *line = packet_read_line(in, NULL);
140 if (!skip_prefix(line, "unpack ", &line))
141 return error(_("unable to parse remote unpack status: %s"), line);
142 if (strcmp(line, "ok"))
143 return error(_("remote unpack failed: %s"), line);
144 return 0;
145}
146static int receive_status(int in, struct ref *refs)
148{
149 struct ref *hint;
150 int ret;
151 hint = NULL;
153 ret = receive_unpack_status(in);
154 while (1) {
155 char *refname;
156 char *msg;
157 char *line = packet_read_line(in, NULL);
158 if (!line)
159 break;
160 if (!starts_with(line, "ok ") && !starts_with(line, "ng ")) {
161 error("invalid ref status from remote: %s", line);
162 ret = -1;
163 break;
164 }
165 refname = line + 3;
167 msg = strchr(refname, ' ');
168 if (msg)
169 *msg++ = '\0';
170 /* first try searching at our hint, falling back to all refs */
172 if (hint)
173 hint = find_ref_by_name(hint, refname);
174 if (!hint)
175 hint = find_ref_by_name(refs, refname);
176 if (!hint) {
177 warning("remote reported status on unknown ref: %s",
178 refname);
179 continue;
180 }
181 if (hint->status != REF_STATUS_EXPECTING_REPORT) {
182 warning("remote reported status on unexpected ref: %s",
183 refname);
184 continue;
185 }
186 if (line[0] == 'o' && line[1] == 'k')
188 hint->status = REF_STATUS_OK;
189 else {
190 hint->status = REF_STATUS_REMOTE_REJECT;
191 ret = -1;
192 }
193 hint->remote_status = xstrdup_or_null(msg);
194 /* start our next search from the next ref */
195 hint = hint->next;
196 }
197 return ret;
198}
199static int sideband_demux(int in, int out, void *data)
201{
202 int *fd = data, ret;
203#ifdef NO_PTHREADS
204 close(fd[1]);
205#endif
206 ret = recv_sideband("send-pack", fd[0], out);
207 close(out);
208 return ret;
209}
210static 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}
218static void advertise_shallow_grafts_buf(struct strbuf *sb)
220{
221 if (!is_repository_shallow())
222 return;
223 for_each_commit_graft(advertise_shallow_grafts_cb, sb);
224}
225#define CHECK_REF_NO_PUSH -1
227#define CHECK_REF_STATUS_REJECTED -2
228#define CHECK_REF_UPTODATE -3
229static 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 /* 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/*
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 */
256static 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}
263static 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 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 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 if (sign_buffer(&cert, &cert, signing_key))
306 die(_("failed to sign the push certificate"));
307 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");
315free_return:
317 free(signing_key);
318 strbuf_release(&cert);
319 return update_seen;
320}
321static 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 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#define NONCE_LEN_LIMIT 256
346static void reject_invalid_nonce(const char *nonce, int len)
348{
349 int i = 0;
350 if (NONCE_LEN_LIMIT <= len)
352 die("the receiving end asked to sign an invalid nonce <%.*s>",
353 len, nonce);
354 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}
366int 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 /* Does the other end support the reporting? */
393 if (server_supports("report-status"))
394 status_report = 1;
395 if (server_supports("delete-refs"))
396 allow_deleting_refs = 1;
397 if (server_supports("ofs-delta"))
398 args->use_ofs_delta = 1;
399 if (server_supports("side-band-64k"))
400 use_sideband = 1;
401 if (server_supports("quiet"))
402 quiet_supported = 1;
403 if (server_supports("agent"))
404 agent_supported = 1;
405 if (server_supports("no-thin"))
406 args->use_thin_pack = 0;
407 if (server_supports("atomic"))
408 atomic_supported = 1;
409 if (server_supports("push-options"))
410 push_options_supported = 1;
411 if (args->push_cert != SEND_PACK_PUSH_CERT_NEVER) {
413 int len;
414 push_cert_nonce = server_feature_value("push-cert", &len);
415 if (push_cert_nonce) {
416 reject_invalid_nonce(push_cert_nonce, len);
417 push_cert_nonce = xmemdupz(push_cert_nonce, len);
418 } else if (args->push_cert == SEND_PACK_PUSH_CERT_ALWAYS) {
419 die(_("the receiving end does not support --signed push"));
420 } else if (args->push_cert == SEND_PACK_PUSH_CERT_IF_ASKED) {
421 warning(_("not sending a push certificate since the"
422 " receiving end does not support --signed"
423 " push"));
424 }
425 }
426 if (!remote_refs) {
428 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
429 "Perhaps you should specify a branch such as 'master'.\n");
430 return 0;
431 }
432 if (args->atomic && !atomic_supported)
433 die(_("the receiving end does not support --atomic push"));
434 use_atomic = atomic_supported && args->atomic;
436 if (args->push_options && !push_options_supported)
438 die(_("the receiving end does not support push options"));
439 use_push_options = push_options_supported && args->push_options;
441 if (status_report)
443 strbuf_addstr(&cap_buf, " report-status");
444 if (use_sideband)
445 strbuf_addstr(&cap_buf, " side-band-64k");
446 if (quiet_supported && (args->quiet || !args->progress))
447 strbuf_addstr(&cap_buf, " quiet");
448 if (use_atomic)
449 strbuf_addstr(&cap_buf, " atomic");
450 if (use_push_options)
451 strbuf_addstr(&cap_buf, " push-options");
452 if (agent_supported)
453 strbuf_addf(&cap_buf, " agent=%s", git_user_agent_sanitized());
454 /*
456 * NEEDSWORK: why does delete-refs have to be so specific to
457 * send-pack machinery that set_ref_status_for_push() cannot
458 * set this bit for us???
459 */
460 for (ref = remote_refs; ref; ref = ref->next)
461 if (ref->deletion && !allow_deleting_refs)
462 ref->status = REF_STATUS_REJECT_NODELETE;
463 if (!args->dry_run)
465 advertise_shallow_grafts_buf(&req_buf);
466 if (!args->dry_run && push_cert_nonce)
468 cmds_sent = generate_push_cert(&req_buf, remote_refs, args,
469 cap_buf.buf, push_cert_nonce);
470 /*
472 * Clear the status for each ref and see if we need to send
473 * the pack data.
474 */
475 for (ref = remote_refs; ref; ref = ref->next) {
476 switch (check_to_send_update(ref, args)) {
477 case 0: /* no error */
478 break;
479 case CHECK_REF_STATUS_REJECTED:
480 /*
481 * When we know the server would reject a ref update if
482 * we were to send it and we're trying to send the refs
483 * atomically, abort the whole operation.
484 */
485 if (use_atomic) {
486 strbuf_release(&req_buf);
487 strbuf_release(&cap_buf);
488 return atomic_push_failure(args, remote_refs, ref);
489 }
490 /* else fallthrough */
491 default:
492 continue;
493 }
494 if (!ref->deletion)
495 need_pack_data = 1;
496 if (args->dry_run || !status_report)
498 ref->status = REF_STATUS_OK;
499 else
500 ref->status = REF_STATUS_EXPECTING_REPORT;
501 }
502 /*
504 * Finally, tell the other end!
505 */
506 for (ref = remote_refs; ref; ref = ref->next) {
507 char *old_hex, *new_hex;
508 if (args->dry_run || push_cert_nonce)
510 continue;
511 if (check_to_send_update(ref, args) < 0)
513 continue;
514 old_hex = oid_to_hex(&ref->old_oid);
516 new_hex = oid_to_hex(&ref->new_oid);
517 if (!cmds_sent) {
518 packet_buf_write(&req_buf,
519 "%s %s %s%c%s",
520 old_hex, new_hex, ref->name, 0,
521 cap_buf.buf);
522 cmds_sent = 1;
523 } else {
524 packet_buf_write(&req_buf, "%s %s %s",
525 old_hex, new_hex, ref->name);
526 }
527 }
528 if (use_push_options) {
530 struct string_list_item *item;
531 packet_buf_flush(&req_buf);
533 for_each_string_list_item(item, args->push_options)
534 packet_buf_write(&req_buf, "%s", item->string);
535 }
536 if (args->stateless_rpc) {
538 if (!args->dry_run && (cmds_sent || is_repository_shallow())) {
539 packet_buf_flush(&req_buf);
540 send_sideband(out, -1, req_buf.buf, req_buf.len, LARGE_PACKET_MAX);
541 }
542 } else {
543 write_or_die(out, req_buf.buf, req_buf.len);
544 packet_flush(out);
545 }
546 strbuf_release(&req_buf);
547 strbuf_release(&cap_buf);
548 if (use_sideband && cmds_sent) {
550 memset(&demux, 0, sizeof(demux));
551 demux.proc = sideband_demux;
552 demux.data = fd;
553 demux.out = -1;
554 demux.isolate_sigpipe = 1;
555 if (start_async(&demux))
556 die("send-pack: unable to fork off sideband demultiplexer");
557 in = demux.out;
558 }
559 if (need_pack_data && cmds_sent) {
561 if (pack_objects(out, remote_refs, extra_have, args) < 0) {
562 for (ref = remote_refs; ref; ref = ref->next)
563 ref->status = REF_STATUS_NONE;
564 if (args->stateless_rpc)
565 close(out);
566 if (git_connection_is_socket(conn))
567 shutdown(fd[0], SHUT_WR);
568 /*
570 * Do not even bother with the return value; we know we
571 * are failing, and just want the error() side effects.
572 */
573 if (status_report)
574 receive_unpack_status(in);
575 if (use_sideband) {
577 close(demux.out);
578 finish_async(&demux);
579 }
580 fd[1] = -1;
581 return -1;
582 }
583 if (!args->stateless_rpc)
584 /* Closed by pack_objects() via start_command() */
585 fd[1] = -1;
586 }
587 if (args->stateless_rpc && cmds_sent)
588 packet_flush(out);
589 if (status_report && cmds_sent)
591 ret = receive_status(in, remote_refs);
592 else
593 ret = 0;
594 if (args->stateless_rpc)
595 packet_flush(out);
596 if (use_sideband && cmds_sent) {
598 close(demux.out);
599 if (finish_async(&demux)) {
600 error("error in sideband demultiplexer");
601 ret = -1;
602 }
603 }
604 if (ret < 0)
606 return ret;
607 if (args->porcelain)
609 return 0;
610 for (ref = remote_refs; ref; ref = ref->next) {
612 switch (ref->status) {
613 case REF_STATUS_NONE:
614 case REF_STATUS_UPTODATE:
615 case REF_STATUS_OK:
616 break;
617 default:
618 return -1;
619 }
620 }
621 return 0;
622}