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"
15static int feed_object(const unsigned char *sha1, int fd, int negative)
17{
18 char buf[42];
19 if (negative && !has_sha1_file(sha1))
21 return 1;
22 memcpy(buf + negative, sha1_to_hex(sha1), 40);
24 if (negative)
25 buf[0] = '^';
26 buf[40 + negative] = '\n';
27 return write_or_whine(fd, buf, 41 + negative, "send-pack: send refs");
28}
29/*
31 * Make a pack stream and spit it out into file descriptor fd
32 */
33static int pack_objects(int fd, struct ref *refs, struct sha1_array *extra, struct send_pack_args *args)
34{
35 /*
36 * The child becomes pack-objects --revs; we feed
37 * the revision parameters to it via its stdin and
38 * let its stdout go back to the other end.
39 */
40 const char *argv[] = {
41 "pack-objects",
42 "--all-progress-implied",
43 "--revs",
44 "--stdout",
45 NULL,
46 NULL,
47 NULL,
48 NULL,
49 NULL,
50 NULL,
51 };
52 struct child_process po = CHILD_PROCESS_INIT;
53 int i;
54 i = 4;
56 if (args->use_thin_pack)
57 argv[i++] = "--thin";
58 if (args->use_ofs_delta)
59 argv[i++] = "--delta-base-offset";
60 if (args->quiet || !args->progress)
61 argv[i++] = "-q";
62 if (args->progress)
63 argv[i++] = "--progress";
64 if (is_repository_shallow())
65 argv[i++] = "--shallow";
66 po.argv = argv;
67 po.in = -1;
68 po.out = args->stateless_rpc ? -1 : fd;
69 po.git_cmd = 1;
70 if (start_command(&po))
71 die_errno("git pack-objects failed");
72 /*
74 * We feed the pack-objects we just spawned with revision
75 * parameters by writing to the pipe.
76 */
77 for (i = 0; i < extra->nr; i++)
78 if (!feed_object(extra->sha1[i], po.in, 1))
79 break;
80 while (refs) {
82 if (!is_null_sha1(refs->old_sha1) &&
83 !feed_object(refs->old_sha1, po.in, 1))
84 break;
85 if (!is_null_sha1(refs->new_sha1) &&
86 !feed_object(refs->new_sha1, po.in, 0))
87 break;
88 refs = refs->next;
89 }
90 close(po.in);
92 if (args->stateless_rpc) {
94 char *buf = xmalloc(LARGE_PACKET_MAX);
95 while (1) {
96 ssize_t n = xread(po.out, buf, LARGE_PACKET_MAX);
97 if (n <= 0)
98 break;
99 send_sideband(fd, -1, buf, n, LARGE_PACKET_MAX);
100 }
101 free(buf);
102 close(po.out);
103 po.out = -1;
104 }
105 if (finish_command(&po))
107 return -1;
108 return 0;
109}
110static int receive_status(int in, struct ref *refs)
112{
113 struct ref *hint;
114 int ret = 0;
115 char *line = packet_read_line(in, NULL);
116 if (!starts_with(line, "unpack "))
117 return error("did not receive remote status");
118 if (strcmp(line, "unpack ok")) {
119 error("unpack failed: %s", line + 7);
120 ret = -1;
121 }
122 hint = NULL;
123 while (1) {
124 char *refname;
125 char *msg;
126 line = packet_read_line(in, NULL);
127 if (!line)
128 break;
129 if (!starts_with(line, "ok ") && !starts_with(line, "ng ")) {
130 error("invalid ref status from remote: %s", line);
131 ret = -1;
132 break;
133 }
134 refname = line + 3;
136 msg = strchr(refname, ' ');
137 if (msg)
138 *msg++ = '\0';
139 /* first try searching at our hint, falling back to all refs */
141 if (hint)
142 hint = find_ref_by_name(hint, refname);
143 if (!hint)
144 hint = find_ref_by_name(refs, refname);
145 if (!hint) {
146 warning("remote reported status on unknown ref: %s",
147 refname);
148 continue;
149 }
150 if (hint->status != REF_STATUS_EXPECTING_REPORT) {
151 warning("remote reported status on unexpected ref: %s",
152 refname);
153 continue;
154 }
155 if (line[0] == 'o' && line[1] == 'k')
157 hint->status = REF_STATUS_OK;
158 else {
159 hint->status = REF_STATUS_REMOTE_REJECT;
160 ret = -1;
161 }
162 if (msg)
163 hint->remote_status = xstrdup(msg);
164 /* start our next search from the next ref */
165 hint = hint->next;
166 }
167 return ret;
168}
169static int sideband_demux(int in, int out, void *data)
171{
172 int *fd = data, ret;
173#ifdef NO_PTHREADS
174 close(fd[1]);
175#endif
176 ret = recv_sideband("send-pack", fd[0], out);
177 close(out);
178 return ret;
179}
180static int advertise_shallow_grafts_cb(const struct commit_graft *graft, void *cb)
182{
183 struct strbuf *sb = cb;
184 if (graft->nr_parent == -1)
185 packet_buf_write(sb, "shallow %s\n", sha1_to_hex(graft->sha1));
186 return 0;
187}
188static void advertise_shallow_grafts_buf(struct strbuf *sb)
190{
191 if (!is_repository_shallow())
192 return;
193 for_each_commit_graft(advertise_shallow_grafts_cb, sb);
194}
195#define CHECK_REF_NO_PUSH -1
197#define CHECK_REF_STATUS_REJECTED -2
198#define CHECK_REF_UPTODATE -3
199static int check_to_send_update(const struct ref *ref, const struct send_pack_args *args)
200{
201 if (!ref->peer_ref && !args->send_mirror)
202 return CHECK_REF_NO_PUSH;
203 /* Check for statuses set by set_ref_status_for_push() */
205 switch (ref->status) {
206 case REF_STATUS_REJECT_NONFASTFORWARD:
207 case REF_STATUS_REJECT_ALREADY_EXISTS:
208 case REF_STATUS_REJECT_FETCH_FIRST:
209 case REF_STATUS_REJECT_NEEDS_FORCE:
210 case REF_STATUS_REJECT_STALE:
211 case REF_STATUS_REJECT_NODELETE:
212 return CHECK_REF_STATUS_REJECTED;
213 case REF_STATUS_UPTODATE:
214 return CHECK_REF_UPTODATE;
215 default:
216 return 0;
217 }
218}
219/*
221 * the beginning of the next line, or the end of buffer.
222 *
223 * NEEDSWORK: perhaps move this to git-compat-util.h or somewhere and
224 * convert many similar uses found by "git grep -A4 memchr".
225 */
226static const char *next_line(const char *line, size_t len)
227{
228 const char *nl = memchr(line, '\n', len);
229 if (!nl)
230 return line + len; /* incomplete line */
231 return nl + 1;
232}
233static int generate_push_cert(struct strbuf *req_buf,
235 const struct ref *remote_refs,
236 struct send_pack_args *args,
237 const char *cap_string,
238 const char *push_cert_nonce)
239{
240 const struct ref *ref;
241 char *signing_key = xstrdup(get_signing_key());
242 const char *cp, *np;
243 struct strbuf cert = STRBUF_INIT;
244 int update_seen = 0;
245 strbuf_addf(&cert, "certificate version 0.1\n");
247 strbuf_addf(&cert, "pusher %s ", signing_key);
248 datestamp(&cert);
249 strbuf_addch(&cert, '\n');
250 if (args->url && *args->url) {
251 char *anon_url = transport_anonymize_url(args->url);
252 strbuf_addf(&cert, "pushee %s\n", anon_url);
253 free(anon_url);
254 }
255 if (push_cert_nonce[0])
256 strbuf_addf(&cert, "nonce %s\n", push_cert_nonce);
257 strbuf_addstr(&cert, "\n");
258 for (ref = remote_refs; ref; ref = ref->next) {
260 if (check_to_send_update(ref, args) < 0)
261 continue;
262 update_seen = 1;
263 strbuf_addf(&cert, "%s %s %s\n",
264 sha1_to_hex(ref->old_sha1),
265 sha1_to_hex(ref->new_sha1),
266 ref->name);
267 }
268 if (!update_seen)
269 goto free_return;
270 if (sign_buffer(&cert, &cert, signing_key))
272 die(_("failed to sign the push certificate"));
273 packet_buf_write(req_buf, "push-cert%c%s", 0, cap_string);
275 for (cp = cert.buf; cp < cert.buf + cert.len; cp = np) {
276 np = next_line(cp, cert.buf + cert.len - cp);
277 packet_buf_write(req_buf,
278 "%.*s", (int)(np - cp), cp);
279 }
280 packet_buf_write(req_buf, "push-cert-end\n");
281free_return:
283 free(signing_key);
284 strbuf_release(&cert);
285 return update_seen;
286}
287static int atomic_push_failure(struct send_pack_args *args,
290 struct ref *remote_refs,
291 struct ref *failing_ref)
292{
293 struct ref *ref;
294 /* Mark other refs as failed */
295 for (ref = remote_refs; ref; ref = ref->next) {
296 if (!ref->peer_ref && !args->send_mirror)
297 continue;
298 switch (ref->status) {
300 case REF_STATUS_EXPECTING_REPORT:
301 ref->status = REF_STATUS_ATOMIC_PUSH_FAILED;
302 continue;
303 default:
304 break; /* do nothing */
305 }
306 }
307 return error("atomic push failed for ref %s. status: %d\n",
308 failing_ref->name, failing_ref->status);
309}
310#define NONCE_LEN_LIMIT 256
312static void reject_invalid_nonce(const char *nonce, int len)
314{
315 int i = 0;
316 if (NONCE_LEN_LIMIT <= len)
318 die("the receiving end asked to sign an invalid nonce <%.*s>",
319 len, nonce);
320 for (i = 0; i < len; i++) {
322 int ch = nonce[i] & 0xFF;
323 if (isalnum(ch) ||
324 ch == '-' || ch == '.' ||
325 ch == '/' || ch == '+' ||
326 ch == '=' || ch == '_')
327 continue;
328 die("the receiving end asked to sign an invalid nonce <%.*s>",
329 len, nonce);
330 }
331}
332int send_pack(struct send_pack_args *args,
334 int fd[], struct child_process *conn,
335 struct ref *remote_refs,
336 struct sha1_array *extra_have)
337{
338 int in = fd[0];
339 int out = fd[1];
340 struct strbuf req_buf = STRBUF_INIT;
341 struct strbuf cap_buf = STRBUF_INIT;
342 struct ref *ref;
343 int need_pack_data = 0;
344 int allow_deleting_refs = 0;
345 int status_report = 0;
346 int use_sideband = 0;
347 int quiet_supported = 0;
348 int agent_supported = 0;
349 int use_atomic = 0;
350 int atomic_supported = 0;
351 unsigned cmds_sent = 0;
352 int ret;
353 struct async demux;
354 const char *push_cert_nonce = NULL;
355 /* Does the other end support the reporting? */
357 if (server_supports("report-status"))
358 status_report = 1;
359 if (server_supports("delete-refs"))
360 allow_deleting_refs = 1;
361 if (server_supports("ofs-delta"))
362 args->use_ofs_delta = 1;
363 if (server_supports("side-band-64k"))
364 use_sideband = 1;
365 if (server_supports("quiet"))
366 quiet_supported = 1;
367 if (server_supports("agent"))
368 agent_supported = 1;
369 if (server_supports("no-thin"))
370 args->use_thin_pack = 0;
371 if (server_supports("atomic"))
372 atomic_supported = 1;
373 if (args->push_cert) {
374 int len;
375 push_cert_nonce = server_feature_value("push-cert", &len);
377 if (!push_cert_nonce)
378 die(_("the receiving end does not support --signed push"));
379 reject_invalid_nonce(push_cert_nonce, len);
380 push_cert_nonce = xmemdupz(push_cert_nonce, len);
381 }
382 if (!remote_refs) {
384 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
385 "Perhaps you should specify a branch such as 'master'.\n");
386 return 0;
387 }
388 if (args->atomic && !atomic_supported)
389 die(_("the receiving end does not support --atomic push"));
390 use_atomic = atomic_supported && args->atomic;
392 if (status_report)
394 strbuf_addstr(&cap_buf, " report-status");
395 if (use_sideband)
396 strbuf_addstr(&cap_buf, " side-band-64k");
397 if (quiet_supported && (args->quiet || !args->progress))
398 strbuf_addstr(&cap_buf, " quiet");
399 if (use_atomic)
400 strbuf_addstr(&cap_buf, " atomic");
401 if (agent_supported)
402 strbuf_addf(&cap_buf, " agent=%s", git_user_agent_sanitized());
403 /*
405 * NEEDSWORK: why does delete-refs have to be so specific to
406 * send-pack machinery that set_ref_status_for_push() cannot
407 * set this bit for us???
408 */
409 for (ref = remote_refs; ref; ref = ref->next)
410 if (ref->deletion && !allow_deleting_refs)
411 ref->status = REF_STATUS_REJECT_NODELETE;
412 if (!args->dry_run)
414 advertise_shallow_grafts_buf(&req_buf);
415 if (!args->dry_run && args->push_cert)
417 cmds_sent = generate_push_cert(&req_buf, remote_refs, args,
418 cap_buf.buf, push_cert_nonce);
419 /*
421 * Clear the status for each ref and see if we need to send
422 * the pack data.
423 */
424 for (ref = remote_refs; ref; ref = ref->next) {
425 switch (check_to_send_update(ref, args)) {
426 case 0: /* no error */
427 break;
428 case CHECK_REF_STATUS_REJECTED:
429 /*
430 * When we know the server would reject a ref update if
431 * we were to send it and we're trying to send the refs
432 * atomically, abort the whole operation.
433 */
434 if (use_atomic)
435 return atomic_push_failure(args, remote_refs, ref);
436 /* Fallthrough for non atomic case. */
437 default:
438 continue;
439 }
440 if (!ref->deletion)
441 need_pack_data = 1;
442 if (args->dry_run || !status_report)
444 ref->status = REF_STATUS_OK;
445 else
446 ref->status = REF_STATUS_EXPECTING_REPORT;
447 }
448 /*
450 * Finally, tell the other end!
451 */
452 for (ref = remote_refs; ref; ref = ref->next) {
453 char *old_hex, *new_hex;
454 if (args->dry_run || args->push_cert)
456 continue;
457 if (check_to_send_update(ref, args) < 0)
459 continue;
460 old_hex = sha1_to_hex(ref->old_sha1);
462 new_hex = sha1_to_hex(ref->new_sha1);
463 if (!cmds_sent) {
464 packet_buf_write(&req_buf,
465 "%s %s %s%c%s",
466 old_hex, new_hex, ref->name, 0,
467 cap_buf.buf);
468 cmds_sent = 1;
469 } else {
470 packet_buf_write(&req_buf, "%s %s %s",
471 old_hex, new_hex, ref->name);
472 }
473 }
474 if (args->stateless_rpc) {
476 if (!args->dry_run && (cmds_sent || is_repository_shallow())) {
477 packet_buf_flush(&req_buf);
478 send_sideband(out, -1, req_buf.buf, req_buf.len, LARGE_PACKET_MAX);
479 }
480 } else {
481 write_or_die(out, req_buf.buf, req_buf.len);
482 packet_flush(out);
483 }
484 strbuf_release(&req_buf);
485 strbuf_release(&cap_buf);
486 if (use_sideband && cmds_sent) {
488 memset(&demux, 0, sizeof(demux));
489 demux.proc = sideband_demux;
490 demux.data = fd;
491 demux.out = -1;
492 if (start_async(&demux))
493 die("send-pack: unable to fork off sideband demultiplexer");
494 in = demux.out;
495 }
496 if (need_pack_data && cmds_sent) {
498 if (pack_objects(out, remote_refs, extra_have, args) < 0) {
499 for (ref = remote_refs; ref; ref = ref->next)
500 ref->status = REF_STATUS_NONE;
501 if (args->stateless_rpc)
502 close(out);
503 if (git_connection_is_socket(conn))
504 shutdown(fd[0], SHUT_WR);
505 if (use_sideband)
506 finish_async(&demux);
507 fd[1] = -1;
508 return -1;
509 }
510 if (!args->stateless_rpc)
511 /* Closed by pack_objects() via start_command() */
512 fd[1] = -1;
513 }
514 if (args->stateless_rpc && cmds_sent)
515 packet_flush(out);
516 if (status_report && cmds_sent)
518 ret = receive_status(in, remote_refs);
519 else
520 ret = 0;
521 if (args->stateless_rpc)
522 packet_flush(out);
523 if (use_sideband && cmds_sent) {
525 if (finish_async(&demux)) {
526 error("error in sideband demultiplexer");
527 ret = -1;
528 }
529 close(demux.out);
530 }
531 if (ret < 0)
533 return ret;
534 if (args->porcelain)
536 return 0;
537 for (ref = remote_refs; ref; ref = ref->next) {
539 switch (ref->status) {
540 case REF_STATUS_NONE:
541 case REF_STATUS_UPTODATE:
542 case REF_STATUS_OK:
543 break;
544 default:
545 return -1;
546 }
547 }
548 return 0;
549}