Merge branch 'nd/files-backend-git-dir' into next
[git] / send-pack.c
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"
16
17 int 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 }
38
39 static void feed_object(const unsigned char *sha1, FILE *fh, int negative)
40 {
41         if (negative && !has_sha1_file(sha1))
42                 return;
43
44         if (negative)
45                 putc('^', fh);
46         fputs(sha1_to_hex(sha1), fh);
47         putc('\n', fh);
48 }
49
50 /*
51  * Make a pack stream and spit it out into file descriptor fd
52  */
53 static int pack_objects(int fd, struct ref *refs, struct oid_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         int rc;
76
77         i = 4;
78         if (args->use_thin_pack)
79                 argv[i++] = "--thin";
80         if (args->use_ofs_delta)
81                 argv[i++] = "--delta-base-offset";
82         if (args->quiet || !args->progress)
83                 argv[i++] = "-q";
84         if (args->progress)
85                 argv[i++] = "--progress";
86         if (is_repository_shallow())
87                 argv[i++] = "--shallow";
88         po.argv = argv;
89         po.in = -1;
90         po.out = args->stateless_rpc ? -1 : fd;
91         po.git_cmd = 1;
92         if (start_command(&po))
93                 die_errno("git pack-objects failed");
94
95         /*
96          * We feed the pack-objects we just spawned with revision
97          * parameters by writing to the pipe.
98          */
99         po_in = xfdopen(po.in, "w");
100         for (i = 0; i < extra->nr; i++)
101                 feed_object(extra->oid[i].hash, po_in, 1);
102
103         while (refs) {
104                 if (!is_null_oid(&refs->old_oid))
105                         feed_object(refs->old_oid.hash, po_in, 1);
106                 if (!is_null_oid(&refs->new_oid))
107                         feed_object(refs->new_oid.hash, po_in, 0);
108                 refs = refs->next;
109         }
110
111         fflush(po_in);
112         if (ferror(po_in))
113                 die_errno("error writing to pack-objects");
114         fclose(po_in);
115
116         if (args->stateless_rpc) {
117                 char *buf = xmalloc(LARGE_PACKET_MAX);
118                 while (1) {
119                         ssize_t n = xread(po.out, buf, LARGE_PACKET_MAX);
120                         if (n <= 0)
121                                 break;
122                         send_sideband(fd, -1, buf, n, LARGE_PACKET_MAX);
123                 }
124                 free(buf);
125                 close(po.out);
126                 po.out = -1;
127         }
128
129         rc = finish_command(&po);
130         if (rc) {
131                 /*
132                  * For a normal non-zero exit, we assume pack-objects wrote
133                  * something useful to stderr. For death by signal, though,
134                  * we should mention it to the user. The exception is SIGPIPE
135                  * (141), because that's a normal occurence if the remote end
136                  * hangs up (and we'll report that by trying to read the unpack
137                  * status).
138                  */
139                 if (rc > 128 && rc != 141)
140                         error("pack-objects died of signal %d", rc - 128);
141                 return -1;
142         }
143         return 0;
144 }
145
146 static int receive_unpack_status(int in)
147 {
148         const char *line = packet_read_line(in, NULL);
149         if (!skip_prefix(line, "unpack ", &line))
150                 return error(_("unable to parse remote unpack status: %s"), line);
151         if (strcmp(line, "ok"))
152                 return error(_("remote unpack failed: %s"), line);
153         return 0;
154 }
155
156 static int receive_status(int in, struct ref *refs)
157 {
158         struct ref *hint;
159         int ret;
160
161         hint = NULL;
162         ret = receive_unpack_status(in);
163         while (1) {
164                 char *refname;
165                 char *msg;
166                 char *line = packet_read_line(in, NULL);
167                 if (!line)
168                         break;
169                 if (!starts_with(line, "ok ") && !starts_with(line, "ng ")) {
170                         error("invalid ref status from remote: %s", line);
171                         ret = -1;
172                         break;
173                 }
174
175                 refname = line + 3;
176                 msg = strchr(refname, ' ');
177                 if (msg)
178                         *msg++ = '\0';
179
180                 /* first try searching at our hint, falling back to all refs */
181                 if (hint)
182                         hint = find_ref_by_name(hint, refname);
183                 if (!hint)
184                         hint = find_ref_by_name(refs, refname);
185                 if (!hint) {
186                         warning("remote reported status on unknown ref: %s",
187                                         refname);
188                         continue;
189                 }
190                 if (hint->status != REF_STATUS_EXPECTING_REPORT) {
191                         warning("remote reported status on unexpected ref: %s",
192                                         refname);
193                         continue;
194                 }
195
196                 if (line[0] == 'o' && line[1] == 'k')
197                         hint->status = REF_STATUS_OK;
198                 else {
199                         hint->status = REF_STATUS_REMOTE_REJECT;
200                         ret = -1;
201                 }
202                 hint->remote_status = xstrdup_or_null(msg);
203                 /* start our next search from the next ref */
204                 hint = hint->next;
205         }
206         return ret;
207 }
208
209 static int sideband_demux(int in, int out, void *data)
210 {
211         int *fd = data, ret;
212 #ifdef NO_PTHREADS
213         close(fd[1]);
214 #endif
215         ret = recv_sideband("send-pack", fd[0], out);
216         close(out);
217         return ret;
218 }
219
220 static int advertise_shallow_grafts_cb(const struct commit_graft *graft, void *cb)
221 {
222         struct strbuf *sb = cb;
223         if (graft->nr_parent == -1)
224                 packet_buf_write(sb, "shallow %s\n", oid_to_hex(&graft->oid));
225         return 0;
226 }
227
228 static void advertise_shallow_grafts_buf(struct strbuf *sb)
229 {
230         if (!is_repository_shallow())
231                 return;
232         for_each_commit_graft(advertise_shallow_grafts_cb, sb);
233 }
234
235 #define CHECK_REF_NO_PUSH -1
236 #define CHECK_REF_STATUS_REJECTED -2
237 #define CHECK_REF_UPTODATE -3
238 static int check_to_send_update(const struct ref *ref, const struct send_pack_args *args)
239 {
240         if (!ref->peer_ref && !args->send_mirror)
241                 return CHECK_REF_NO_PUSH;
242
243         /* Check for statuses set by set_ref_status_for_push() */
244         switch (ref->status) {
245         case REF_STATUS_REJECT_NONFASTFORWARD:
246         case REF_STATUS_REJECT_ALREADY_EXISTS:
247         case REF_STATUS_REJECT_FETCH_FIRST:
248         case REF_STATUS_REJECT_NEEDS_FORCE:
249         case REF_STATUS_REJECT_STALE:
250         case REF_STATUS_REJECT_NODELETE:
251                 return CHECK_REF_STATUS_REJECTED;
252         case REF_STATUS_UPTODATE:
253                 return CHECK_REF_UPTODATE;
254         default:
255                 return 0;
256         }
257 }
258
259 /*
260  * the beginning of the next line, or the end of buffer.
261  *
262  * NEEDSWORK: perhaps move this to git-compat-util.h or somewhere and
263  * convert many similar uses found by "git grep -A4 memchr".
264  */
265 static const char *next_line(const char *line, size_t len)
266 {
267         const char *nl = memchr(line, '\n', len);
268         if (!nl)
269                 return line + len; /* incomplete line */
270         return nl + 1;
271 }
272
273 static int generate_push_cert(struct strbuf *req_buf,
274                               const struct ref *remote_refs,
275                               struct send_pack_args *args,
276                               const char *cap_string,
277                               const char *push_cert_nonce)
278 {
279         const struct ref *ref;
280         struct string_list_item *item;
281         char *signing_key = xstrdup(get_signing_key());
282         const char *cp, *np;
283         struct strbuf cert = STRBUF_INIT;
284         int update_seen = 0;
285
286         strbuf_addstr(&cert, "certificate version 0.1\n");
287         strbuf_addf(&cert, "pusher %s ", signing_key);
288         datestamp(&cert);
289         strbuf_addch(&cert, '\n');
290         if (args->url && *args->url) {
291                 char *anon_url = transport_anonymize_url(args->url);
292                 strbuf_addf(&cert, "pushee %s\n", anon_url);
293                 free(anon_url);
294         }
295         if (push_cert_nonce[0])
296                 strbuf_addf(&cert, "nonce %s\n", push_cert_nonce);
297         if (args->push_options)
298                 for_each_string_list_item(item, args->push_options)
299                         strbuf_addf(&cert, "push-option %s\n", item->string);
300         strbuf_addstr(&cert, "\n");
301
302         for (ref = remote_refs; ref; ref = ref->next) {
303                 if (check_to_send_update(ref, args) < 0)
304                         continue;
305                 update_seen = 1;
306                 strbuf_addf(&cert, "%s %s %s\n",
307                             oid_to_hex(&ref->old_oid),
308                             oid_to_hex(&ref->new_oid),
309                             ref->name);
310         }
311         if (!update_seen)
312                 goto free_return;
313
314         if (sign_buffer(&cert, &cert, signing_key))
315                 die(_("failed to sign the push certificate"));
316
317         packet_buf_write(req_buf, "push-cert%c%s", 0, cap_string);
318         for (cp = cert.buf; cp < cert.buf + cert.len; cp = np) {
319                 np = next_line(cp, cert.buf + cert.len - cp);
320                 packet_buf_write(req_buf,
321                                  "%.*s", (int)(np - cp), cp);
322         }
323         packet_buf_write(req_buf, "push-cert-end\n");
324
325 free_return:
326         free(signing_key);
327         strbuf_release(&cert);
328         return update_seen;
329 }
330
331
332 static int atomic_push_failure(struct send_pack_args *args,
333                                struct ref *remote_refs,
334                                struct ref *failing_ref)
335 {
336         struct ref *ref;
337         /* Mark other refs as failed */
338         for (ref = remote_refs; ref; ref = ref->next) {
339                 if (!ref->peer_ref && !args->send_mirror)
340                         continue;
341
342                 switch (ref->status) {
343                 case REF_STATUS_EXPECTING_REPORT:
344                         ref->status = REF_STATUS_ATOMIC_PUSH_FAILED;
345                         continue;
346                 default:
347                         break; /* do nothing */
348                 }
349         }
350         return error("atomic push failed for ref %s. status: %d\n",
351                      failing_ref->name, failing_ref->status);
352 }
353
354 #define NONCE_LEN_LIMIT 256
355
356 static void reject_invalid_nonce(const char *nonce, int len)
357 {
358         int i = 0;
359
360         if (NONCE_LEN_LIMIT <= len)
361                 die("the receiving end asked to sign an invalid nonce <%.*s>",
362                     len, nonce);
363
364         for (i = 0; i < len; i++) {
365                 int ch = nonce[i] & 0xFF;
366                 if (isalnum(ch) ||
367                     ch == '-' || ch == '.' ||
368                     ch == '/' || ch == '+' ||
369                     ch == '=' || ch == '_')
370                         continue;
371                 die("the receiving end asked to sign an invalid nonce <%.*s>",
372                     len, nonce);
373         }
374 }
375
376 int send_pack(struct send_pack_args *args,
377               int fd[], struct child_process *conn,
378               struct ref *remote_refs,
379               struct oid_array *extra_have)
380 {
381         int in = fd[0];
382         int out = fd[1];
383         struct strbuf req_buf = STRBUF_INIT;
384         struct strbuf cap_buf = STRBUF_INIT;
385         struct ref *ref;
386         int need_pack_data = 0;
387         int allow_deleting_refs = 0;
388         int status_report = 0;
389         int use_sideband = 0;
390         int quiet_supported = 0;
391         int agent_supported = 0;
392         int use_atomic = 0;
393         int atomic_supported = 0;
394         int use_push_options = 0;
395         int push_options_supported = 0;
396         unsigned cmds_sent = 0;
397         int ret;
398         struct async demux;
399         const char *push_cert_nonce = NULL;
400
401         /* Does the other end support the reporting? */
402         if (server_supports("report-status"))
403                 status_report = 1;
404         if (server_supports("delete-refs"))
405                 allow_deleting_refs = 1;
406         if (server_supports("ofs-delta"))
407                 args->use_ofs_delta = 1;
408         if (server_supports("side-band-64k"))
409                 use_sideband = 1;
410         if (server_supports("quiet"))
411                 quiet_supported = 1;
412         if (server_supports("agent"))
413                 agent_supported = 1;
414         if (server_supports("no-thin"))
415                 args->use_thin_pack = 0;
416         if (server_supports("atomic"))
417                 atomic_supported = 1;
418         if (server_supports("push-options"))
419                 push_options_supported = 1;
420
421         if (args->push_cert != SEND_PACK_PUSH_CERT_NEVER) {
422                 int len;
423                 push_cert_nonce = server_feature_value("push-cert", &len);
424                 if (push_cert_nonce) {
425                         reject_invalid_nonce(push_cert_nonce, len);
426                         push_cert_nonce = xmemdupz(push_cert_nonce, len);
427                 } else if (args->push_cert == SEND_PACK_PUSH_CERT_ALWAYS) {
428                         die(_("the receiving end does not support --signed push"));
429                 } else if (args->push_cert == SEND_PACK_PUSH_CERT_IF_ASKED) {
430                         warning(_("not sending a push certificate since the"
431                                   " receiving end does not support --signed"
432                                   " push"));
433                 }
434         }
435
436         if (!remote_refs) {
437                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
438                         "Perhaps you should specify a branch such as 'master'.\n");
439                 return 0;
440         }
441         if (args->atomic && !atomic_supported)
442                 die(_("the receiving end does not support --atomic push"));
443
444         use_atomic = atomic_supported && args->atomic;
445
446         if (args->push_options && !push_options_supported)
447                 die(_("the receiving end does not support push options"));
448
449         use_push_options = push_options_supported && args->push_options;
450
451         if (status_report)
452                 strbuf_addstr(&cap_buf, " report-status");
453         if (use_sideband)
454                 strbuf_addstr(&cap_buf, " side-band-64k");
455         if (quiet_supported && (args->quiet || !args->progress))
456                 strbuf_addstr(&cap_buf, " quiet");
457         if (use_atomic)
458                 strbuf_addstr(&cap_buf, " atomic");
459         if (use_push_options)
460                 strbuf_addstr(&cap_buf, " push-options");
461         if (agent_supported)
462                 strbuf_addf(&cap_buf, " agent=%s", git_user_agent_sanitized());
463
464         /*
465          * NEEDSWORK: why does delete-refs have to be so specific to
466          * send-pack machinery that set_ref_status_for_push() cannot
467          * set this bit for us???
468          */
469         for (ref = remote_refs; ref; ref = ref->next)
470                 if (ref->deletion && !allow_deleting_refs)
471                         ref->status = REF_STATUS_REJECT_NODELETE;
472
473         if (!args->dry_run)
474                 advertise_shallow_grafts_buf(&req_buf);
475
476         if (!args->dry_run && push_cert_nonce)
477                 cmds_sent = generate_push_cert(&req_buf, remote_refs, args,
478                                                cap_buf.buf, push_cert_nonce);
479
480         /*
481          * Clear the status for each ref and see if we need to send
482          * the pack data.
483          */
484         for (ref = remote_refs; ref; ref = ref->next) {
485                 switch (check_to_send_update(ref, args)) {
486                 case 0: /* no error */
487                         break;
488                 case CHECK_REF_STATUS_REJECTED:
489                         /*
490                          * When we know the server would reject a ref update if
491                          * we were to send it and we're trying to send the refs
492                          * atomically, abort the whole operation.
493                          */
494                         if (use_atomic)
495                                 return atomic_push_failure(args, remote_refs, ref);
496                         /* Fallthrough for non atomic case. */
497                 default:
498                         continue;
499                 }
500                 if (!ref->deletion)
501                         need_pack_data = 1;
502
503                 if (args->dry_run || !status_report)
504                         ref->status = REF_STATUS_OK;
505                 else
506                         ref->status = REF_STATUS_EXPECTING_REPORT;
507         }
508
509         /*
510          * Finally, tell the other end!
511          */
512         for (ref = remote_refs; ref; ref = ref->next) {
513                 char *old_hex, *new_hex;
514
515                 if (args->dry_run || push_cert_nonce)
516                         continue;
517
518                 if (check_to_send_update(ref, args) < 0)
519                         continue;
520
521                 old_hex = oid_to_hex(&ref->old_oid);
522                 new_hex = oid_to_hex(&ref->new_oid);
523                 if (!cmds_sent) {
524                         packet_buf_write(&req_buf,
525                                          "%s %s %s%c%s",
526                                          old_hex, new_hex, ref->name, 0,
527                                          cap_buf.buf);
528                         cmds_sent = 1;
529                 } else {
530                         packet_buf_write(&req_buf, "%s %s %s",
531                                          old_hex, new_hex, ref->name);
532                 }
533         }
534
535         if (use_push_options) {
536                 struct string_list_item *item;
537
538                 packet_buf_flush(&req_buf);
539                 for_each_string_list_item(item, args->push_options)
540                         packet_buf_write(&req_buf, "%s", item->string);
541         }
542
543         if (args->stateless_rpc) {
544                 if (!args->dry_run && (cmds_sent || is_repository_shallow())) {
545                         packet_buf_flush(&req_buf);
546                         send_sideband(out, -1, req_buf.buf, req_buf.len, LARGE_PACKET_MAX);
547                 }
548         } else {
549                 write_or_die(out, req_buf.buf, req_buf.len);
550                 packet_flush(out);
551         }
552         strbuf_release(&req_buf);
553         strbuf_release(&cap_buf);
554
555         if (use_sideband && cmds_sent) {
556                 memset(&demux, 0, sizeof(demux));
557                 demux.proc = sideband_demux;
558                 demux.data = fd;
559                 demux.out = -1;
560                 demux.isolate_sigpipe = 1;
561                 if (start_async(&demux))
562                         die("send-pack: unable to fork off sideband demultiplexer");
563                 in = demux.out;
564         }
565
566         if (need_pack_data && cmds_sent) {
567                 if (pack_objects(out, remote_refs, extra_have, args) < 0) {
568                         for (ref = remote_refs; ref; ref = ref->next)
569                                 ref->status = REF_STATUS_NONE;
570                         if (args->stateless_rpc)
571                                 close(out);
572                         if (git_connection_is_socket(conn))
573                                 shutdown(fd[0], SHUT_WR);
574
575                         /*
576                          * Do not even bother with the return value; we know we
577                          * are failing, and just want the error() side effects.
578                          */
579                         if (status_report)
580                                 receive_unpack_status(in);
581
582                         if (use_sideband) {
583                                 close(demux.out);
584                                 finish_async(&demux);
585                         }
586                         fd[1] = -1;
587                         return -1;
588                 }
589                 if (!args->stateless_rpc)
590                         /* Closed by pack_objects() via start_command() */
591                         fd[1] = -1;
592         }
593         if (args->stateless_rpc && cmds_sent)
594                 packet_flush(out);
595
596         if (status_report && cmds_sent)
597                 ret = receive_status(in, remote_refs);
598         else
599                 ret = 0;
600         if (args->stateless_rpc)
601                 packet_flush(out);
602
603         if (use_sideband && cmds_sent) {
604                 close(demux.out);
605                 if (finish_async(&demux)) {
606                         error("error in sideband demultiplexer");
607                         ret = -1;
608                 }
609         }
610
611         if (ret < 0)
612                 return ret;
613
614         if (args->porcelain)
615                 return 0;
616
617         for (ref = remote_refs; ref; ref = ref->next) {
618                 switch (ref->status) {
619                 case REF_STATUS_NONE:
620                 case REF_STATUS_UPTODATE:
621                 case REF_STATUS_OK:
622                         break;
623                 default:
624                         return -1;
625                 }
626         }
627         return 0;
628 }