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}
310int send_pack(struct send_pack_args *args,
312 int fd[], struct child_process *conn,
313 struct ref *remote_refs,
314 struct sha1_array *extra_have)
315{
316 int in = fd[0];
317 int out = fd[1];
318 struct strbuf req_buf = STRBUF_INIT;
319 struct strbuf cap_buf = STRBUF_INIT;
320 struct ref *ref;
321 int need_pack_data = 0;
322 int allow_deleting_refs = 0;
323 int status_report = 0;
324 int use_sideband = 0;
325 int quiet_supported = 0;
326 int agent_supported = 0;
327 int use_atomic = 0;
328 int atomic_supported = 0;
329 unsigned cmds_sent = 0;
330 int ret;
331 struct async demux;
332 const char *push_cert_nonce = NULL;
333 /* Does the other end support the reporting? */
335 if (server_supports("report-status"))
336 status_report = 1;
337 if (server_supports("delete-refs"))
338 allow_deleting_refs = 1;
339 if (server_supports("ofs-delta"))
340 args->use_ofs_delta = 1;
341 if (server_supports("side-band-64k"))
342 use_sideband = 1;
343 if (server_supports("quiet"))
344 quiet_supported = 1;
345 if (server_supports("agent"))
346 agent_supported = 1;
347 if (server_supports("no-thin"))
348 args->use_thin_pack = 0;
349 if (server_supports("atomic"))
350 atomic_supported = 1;
351 if (args->push_cert) {
352 int len;
353 push_cert_nonce = server_feature_value("push-cert", &len);
355 if (!push_cert_nonce)
356 die(_("the receiving end does not support --signed push"));
357 push_cert_nonce = xmemdupz(push_cert_nonce, len);
358 }
359 if (!remote_refs) {
361 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
362 "Perhaps you should specify a branch such as 'master'.\n");
363 return 0;
364 }
365 if (args->atomic && !atomic_supported)
366 die(_("server does not support --atomic push"));
367 use_atomic = atomic_supported && args->atomic;
369 if (status_report)
371 strbuf_addstr(&cap_buf, " report-status");
372 if (use_sideband)
373 strbuf_addstr(&cap_buf, " side-band-64k");
374 if (quiet_supported && (args->quiet || !args->progress))
375 strbuf_addstr(&cap_buf, " quiet");
376 if (use_atomic)
377 strbuf_addstr(&cap_buf, " atomic");
378 if (agent_supported)
379 strbuf_addf(&cap_buf, " agent=%s", git_user_agent_sanitized());
380 /*
382 * NEEDSWORK: why does delete-refs have to be so specific to
383 * send-pack machinery that set_ref_status_for_push() cannot
384 * set this bit for us???
385 */
386 for (ref = remote_refs; ref; ref = ref->next)
387 if (ref->deletion && !allow_deleting_refs)
388 ref->status = REF_STATUS_REJECT_NODELETE;
389 if (!args->dry_run)
391 advertise_shallow_grafts_buf(&req_buf);
392 if (!args->dry_run && args->push_cert)
394 cmds_sent = generate_push_cert(&req_buf, remote_refs, args,
395 cap_buf.buf, push_cert_nonce);
396 /*
398 * Clear the status for each ref and see if we need to send
399 * the pack data.
400 */
401 for (ref = remote_refs; ref; ref = ref->next) {
402 switch (check_to_send_update(ref, args)) {
403 case 0: /* no error */
404 break;
405 case CHECK_REF_STATUS_REJECTED:
406 /*
407 * When we know the server would reject a ref update if
408 * we were to send it and we're trying to send the refs
409 * atomically, abort the whole operation.
410 */
411 if (use_atomic)
412 return atomic_push_failure(args, remote_refs, ref);
413 /* Fallthrough for non atomic case. */
414 default:
415 continue;
416 }
417 if (!ref->deletion)
418 need_pack_data = 1;
419 if (args->dry_run || !status_report)
421 ref->status = REF_STATUS_OK;
422 else
423 ref->status = REF_STATUS_EXPECTING_REPORT;
424 }
425 /*
427 * Finally, tell the other end!
428 */
429 for (ref = remote_refs; ref; ref = ref->next) {
430 char *old_hex, *new_hex;
431 if (args->dry_run || args->push_cert)
433 continue;
434 if (check_to_send_update(ref, args) < 0)
436 continue;
437 old_hex = sha1_to_hex(ref->old_sha1);
439 new_hex = sha1_to_hex(ref->new_sha1);
440 if (!cmds_sent) {
441 packet_buf_write(&req_buf,
442 "%s %s %s%c%s",
443 old_hex, new_hex, ref->name, 0,
444 cap_buf.buf);
445 cmds_sent = 1;
446 } else {
447 packet_buf_write(&req_buf, "%s %s %s",
448 old_hex, new_hex, ref->name);
449 }
450 }
451 if (args->stateless_rpc) {
453 if (!args->dry_run && (cmds_sent || is_repository_shallow())) {
454 packet_buf_flush(&req_buf);
455 send_sideband(out, -1, req_buf.buf, req_buf.len, LARGE_PACKET_MAX);
456 }
457 } else {
458 write_or_die(out, req_buf.buf, req_buf.len);
459 packet_flush(out);
460 }
461 strbuf_release(&req_buf);
462 strbuf_release(&cap_buf);
463 if (use_sideband && cmds_sent) {
465 memset(&demux, 0, sizeof(demux));
466 demux.proc = sideband_demux;
467 demux.data = fd;
468 demux.out = -1;
469 if (start_async(&demux))
470 die("send-pack: unable to fork off sideband demultiplexer");
471 in = demux.out;
472 }
473 if (need_pack_data && cmds_sent) {
475 if (pack_objects(out, remote_refs, extra_have, args) < 0) {
476 for (ref = remote_refs; ref; ref = ref->next)
477 ref->status = REF_STATUS_NONE;
478 if (args->stateless_rpc)
479 close(out);
480 if (git_connection_is_socket(conn))
481 shutdown(fd[0], SHUT_WR);
482 if (use_sideband)
483 finish_async(&demux);
484 fd[1] = -1;
485 return -1;
486 }
487 if (!args->stateless_rpc)
488 /* Closed by pack_objects() via start_command() */
489 fd[1] = -1;
490 }
491 if (args->stateless_rpc && cmds_sent)
492 packet_flush(out);
493 if (status_report && cmds_sent)
495 ret = receive_status(in, remote_refs);
496 else
497 ret = 0;
498 if (args->stateless_rpc)
499 packet_flush(out);
500 if (use_sideband && cmds_sent) {
502 if (finish_async(&demux)) {
503 error("error in sideband demultiplexer");
504 ret = -1;
505 }
506 close(demux.out);
507 }
508 if (ret < 0)
510 return ret;
511 if (args->porcelain)
513 return 0;
514 for (ref = remote_refs; ref; ref = ref->next) {
516 switch (ref->status) {
517 case REF_STATUS_NONE:
518 case REF_STATUS_UPTODATE:
519 case REF_STATUS_OK:
520 break;
521 default:
522 return -1;
523 }
524 }
525 return 0;
526}