Merge branch 'jh/trace2-sid-fix'
[git] / send-pack.c
1 #include "builtin.h"
2 #include "config.h"
3 #include "commit.h"
4 #include "refs.h"
5 #include "object-store.h"
6 #include "pkt-line.h"
7 #include "sideband.h"
8 #include "run-command.h"
9 #include "remote.h"
10 #include "connect.h"
11 #include "send-pack.h"
12 #include "quote.h"
13 #include "transport.h"
14 #include "version.h"
15 #include "sha1-array.h"
16 #include "gpg-interface.h"
17 #include "cache.h"
18
19 int option_parse_push_signed(const struct option *opt,
20                              const char *arg, int unset)
21 {
22         if (unset) {
23                 *(int *)(opt->value) = SEND_PACK_PUSH_CERT_NEVER;
24                 return 0;
25         }
26         switch (git_parse_maybe_bool(arg)) {
27         case 1:
28                 *(int *)(opt->value) = SEND_PACK_PUSH_CERT_ALWAYS;
29                 return 0;
30         case 0:
31                 *(int *)(opt->value) = SEND_PACK_PUSH_CERT_NEVER;
32                 return 0;
33         }
34         if (!strcasecmp("if-asked", arg)) {
35                 *(int *)(opt->value) = SEND_PACK_PUSH_CERT_IF_ASKED;
36                 return 0;
37         }
38         die("bad %s argument: %s", opt->long_name, arg);
39 }
40
41 static void feed_object(const struct object_id *oid, FILE *fh, int negative)
42 {
43         if (negative && !has_object_file(oid))
44                 return;
45
46         if (negative)
47                 putc('^', fh);
48         fputs(oid_to_hex(oid), fh);
49         putc('\n', fh);
50 }
51
52 /*
53  * Make a pack stream and spit it out into file descriptor fd
54  */
55 static int pack_objects(int fd, struct ref *refs, struct oid_array *extra, struct send_pack_args *args)
56 {
57         /*
58          * The child becomes pack-objects --revs; we feed
59          * the revision parameters to it via its stdin and
60          * let its stdout go back to the other end.
61          */
62         struct child_process po = CHILD_PROCESS_INIT;
63         FILE *po_in;
64         int i;
65         int rc;
66
67         argv_array_push(&po.args, "pack-objects");
68         argv_array_push(&po.args, "--all-progress-implied");
69         argv_array_push(&po.args, "--revs");
70         argv_array_push(&po.args, "--stdout");
71         if (args->use_thin_pack)
72                 argv_array_push(&po.args, "--thin");
73         if (args->use_ofs_delta)
74                 argv_array_push(&po.args, "--delta-base-offset");
75         if (args->quiet || !args->progress)
76                 argv_array_push(&po.args, "-q");
77         if (args->progress)
78                 argv_array_push(&po.args, "--progress");
79         if (is_repository_shallow(the_repository))
80                 argv_array_push(&po.args, "--shallow");
81         po.in = -1;
82         po.out = args->stateless_rpc ? -1 : fd;
83         po.git_cmd = 1;
84         if (start_command(&po))
85                 die_errno("git pack-objects failed");
86
87         /*
88          * We feed the pack-objects we just spawned with revision
89          * parameters by writing to the pipe.
90          */
91         po_in = xfdopen(po.in, "w");
92         for (i = 0; i < extra->nr; i++)
93                 feed_object(&extra->oid[i], po_in, 1);
94
95         while (refs) {
96                 if (!is_null_oid(&refs->old_oid))
97                         feed_object(&refs->old_oid, po_in, 1);
98                 if (!is_null_oid(&refs->new_oid))
99                         feed_object(&refs->new_oid, po_in, 0);
100                 refs = refs->next;
101         }
102
103         fflush(po_in);
104         if (ferror(po_in))
105                 die_errno("error writing to pack-objects");
106         fclose(po_in);
107
108         if (args->stateless_rpc) {
109                 char *buf = xmalloc(LARGE_PACKET_MAX);
110                 while (1) {
111                         ssize_t n = xread(po.out, buf, LARGE_PACKET_MAX);
112                         if (n <= 0)
113                                 break;
114                         send_sideband(fd, -1, buf, n, LARGE_PACKET_MAX);
115                 }
116                 free(buf);
117                 close(po.out);
118                 po.out = -1;
119         }
120
121         rc = finish_command(&po);
122         if (rc) {
123                 /*
124                  * For a normal non-zero exit, we assume pack-objects wrote
125                  * something useful to stderr. For death by signal, though,
126                  * we should mention it to the user. The exception is SIGPIPE
127                  * (141), because that's a normal occurrence if the remote end
128                  * hangs up (and we'll report that by trying to read the unpack
129                  * status).
130                  */
131                 if (rc > 128 && rc != 141)
132                         error("pack-objects died of signal %d", rc - 128);
133                 return -1;
134         }
135         return 0;
136 }
137
138 static int receive_unpack_status(struct packet_reader *reader)
139 {
140         if (packet_reader_read(reader) != PACKET_READ_NORMAL)
141                 return error(_("unexpected flush packet while reading remote unpack status"));
142         if (!skip_prefix(reader->line, "unpack ", &reader->line))
143                 return error(_("unable to parse remote unpack status: %s"), reader->line);
144         if (strcmp(reader->line, "ok"))
145                 return error(_("remote unpack failed: %s"), reader->line);
146         return 0;
147 }
148
149 static int receive_status(struct packet_reader *reader, struct ref *refs)
150 {
151         struct ref *hint;
152         int ret;
153
154         hint = NULL;
155         ret = receive_unpack_status(reader);
156         while (1) {
157                 const char *refname;
158                 char *msg;
159                 if (packet_reader_read(reader) != PACKET_READ_NORMAL)
160                         break;
161                 if (!starts_with(reader->line, "ok ") && !starts_with(reader->line, "ng ")) {
162                         error("invalid ref status from remote: %s", reader->line);
163                         ret = -1;
164                         break;
165                 }
166
167                 refname = reader->line + 3;
168                 msg = strchr(refname, ' ');
169                 if (msg)
170                         *msg++ = '\0';
171
172                 /* first try searching at our hint, falling back to all refs */
173                 if (hint)
174                         hint = find_ref_by_name(hint, refname);
175                 if (!hint)
176                         hint = find_ref_by_name(refs, refname);
177                 if (!hint) {
178                         warning("remote reported status on unknown ref: %s",
179                                         refname);
180                         continue;
181                 }
182                 if (hint->status != REF_STATUS_EXPECTING_REPORT) {
183                         warning("remote reported status on unexpected ref: %s",
184                                         refname);
185                         continue;
186                 }
187
188                 if (reader->line[0] == 'o' && reader->line[1] == 'k')
189                         hint->status = REF_STATUS_OK;
190                 else {
191                         hint->status = REF_STATUS_REMOTE_REJECT;
192                         ret = -1;
193                 }
194                 hint->remote_status = xstrdup_or_null(msg);
195                 /* start our next search from the next ref */
196                 hint = hint->next;
197         }
198         return ret;
199 }
200
201 static int sideband_demux(int in, int out, void *data)
202 {
203         int *fd = data, ret;
204         if (async_with_fork())
205                 close(fd[1]);
206         ret = recv_sideband("send-pack", fd[0], out);
207         close(out);
208         return ret;
209 }
210
211 static 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 }
218
219 static void advertise_shallow_grafts_buf(struct strbuf *sb)
220 {
221         if (!is_repository_shallow(the_repository))
222                 return;
223         for_each_commit_graft(advertise_shallow_grafts_cb, sb);
224 }
225
226 #define CHECK_REF_NO_PUSH -1
227 #define CHECK_REF_STATUS_REJECTED -2
228 #define CHECK_REF_UPTODATE -3
229 static 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
234         /* 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
250 /*
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  */
256 static 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 }
263
264 static 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
277         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
293         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
305         if (sign_buffer(&cert, &cert, signing_key))
306                 die(_("failed to sign the push certificate"));
307
308         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");
315
316 free_return:
317         free(signing_key);
318         strbuf_release(&cert);
319         return update_seen;
320 }
321
322
323 static 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
333                 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
345 #define NONCE_LEN_LIMIT 256
346
347 static void reject_invalid_nonce(const char *nonce, int len)
348 {
349         int i = 0;
350
351         if (NONCE_LEN_LIMIT <= len)
352                 die("the receiving end asked to sign an invalid nonce <%.*s>",
353                     len, nonce);
354
355         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 }
366
367 int 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         struct packet_reader reader;
392
393         /* Does the other end support the reporting? */
394         if (server_supports("report-status"))
395                 status_report = 1;
396         if (server_supports("delete-refs"))
397                 allow_deleting_refs = 1;
398         if (server_supports("ofs-delta"))
399                 args->use_ofs_delta = 1;
400         if (server_supports("side-band-64k"))
401                 use_sideband = 1;
402         if (server_supports("quiet"))
403                 quiet_supported = 1;
404         if (server_supports("agent"))
405                 agent_supported = 1;
406         if (server_supports("no-thin"))
407                 args->use_thin_pack = 0;
408         if (server_supports("atomic"))
409                 atomic_supported = 1;
410         if (server_supports("push-options"))
411                 push_options_supported = 1;
412
413         if (args->push_cert != SEND_PACK_PUSH_CERT_NEVER) {
414                 int len;
415                 push_cert_nonce = server_feature_value("push-cert", &len);
416                 if (push_cert_nonce) {
417                         reject_invalid_nonce(push_cert_nonce, len);
418                         push_cert_nonce = xmemdupz(push_cert_nonce, len);
419                 } else if (args->push_cert == SEND_PACK_PUSH_CERT_ALWAYS) {
420                         die(_("the receiving end does not support --signed push"));
421                 } else if (args->push_cert == SEND_PACK_PUSH_CERT_IF_ASKED) {
422                         warning(_("not sending a push certificate since the"
423                                   " receiving end does not support --signed"
424                                   " push"));
425                 }
426         }
427
428         if (!remote_refs) {
429                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
430                         "Perhaps you should specify a branch such as 'master'.\n");
431                 return 0;
432         }
433         if (args->atomic && !atomic_supported)
434                 die(_("the receiving end does not support --atomic push"));
435
436         use_atomic = atomic_supported && args->atomic;
437
438         if (args->push_options && !push_options_supported)
439                 die(_("the receiving end does not support push options"));
440
441         use_push_options = push_options_supported && args->push_options;
442
443         if (status_report)
444                 strbuf_addstr(&cap_buf, " report-status");
445         if (use_sideband)
446                 strbuf_addstr(&cap_buf, " side-band-64k");
447         if (quiet_supported && (args->quiet || !args->progress))
448                 strbuf_addstr(&cap_buf, " quiet");
449         if (use_atomic)
450                 strbuf_addstr(&cap_buf, " atomic");
451         if (use_push_options)
452                 strbuf_addstr(&cap_buf, " push-options");
453         if (agent_supported)
454                 strbuf_addf(&cap_buf, " agent=%s", git_user_agent_sanitized());
455
456         /*
457          * NEEDSWORK: why does delete-refs have to be so specific to
458          * send-pack machinery that set_ref_status_for_push() cannot
459          * set this bit for us???
460          */
461         for (ref = remote_refs; ref; ref = ref->next)
462                 if (ref->deletion && !allow_deleting_refs)
463                         ref->status = REF_STATUS_REJECT_NODELETE;
464
465         if (!args->dry_run)
466                 advertise_shallow_grafts_buf(&req_buf);
467
468         if (!args->dry_run && push_cert_nonce)
469                 cmds_sent = generate_push_cert(&req_buf, remote_refs, args,
470                                                cap_buf.buf, push_cert_nonce);
471
472         /*
473          * Clear the status for each ref and see if we need to send
474          * the pack data.
475          */
476         for (ref = remote_refs; ref; ref = ref->next) {
477                 switch (check_to_send_update(ref, args)) {
478                 case 0: /* no error */
479                         break;
480                 case CHECK_REF_STATUS_REJECTED:
481                         /*
482                          * When we know the server would reject a ref update if
483                          * we were to send it and we're trying to send the refs
484                          * atomically, abort the whole operation.
485                          */
486                         if (use_atomic) {
487                                 strbuf_release(&req_buf);
488                                 strbuf_release(&cap_buf);
489                                 return atomic_push_failure(args, remote_refs, ref);
490                         }
491                         /* else fallthrough */
492                 default:
493                         continue;
494                 }
495                 if (!ref->deletion)
496                         need_pack_data = 1;
497
498                 if (args->dry_run || !status_report)
499                         ref->status = REF_STATUS_OK;
500                 else
501                         ref->status = REF_STATUS_EXPECTING_REPORT;
502         }
503
504         /*
505          * Finally, tell the other end!
506          */
507         for (ref = remote_refs; ref; ref = ref->next) {
508                 char *old_hex, *new_hex;
509
510                 if (args->dry_run || push_cert_nonce)
511                         continue;
512
513                 if (check_to_send_update(ref, args) < 0)
514                         continue;
515
516                 old_hex = oid_to_hex(&ref->old_oid);
517                 new_hex = oid_to_hex(&ref->new_oid);
518                 if (!cmds_sent) {
519                         packet_buf_write(&req_buf,
520                                          "%s %s %s%c%s",
521                                          old_hex, new_hex, ref->name, 0,
522                                          cap_buf.buf);
523                         cmds_sent = 1;
524                 } else {
525                         packet_buf_write(&req_buf, "%s %s %s",
526                                          old_hex, new_hex, ref->name);
527                 }
528         }
529
530         if (use_push_options) {
531                 struct string_list_item *item;
532
533                 packet_buf_flush(&req_buf);
534                 for_each_string_list_item(item, args->push_options)
535                         packet_buf_write(&req_buf, "%s", item->string);
536         }
537
538         if (args->stateless_rpc) {
539                 if (!args->dry_run && (cmds_sent || is_repository_shallow(the_repository))) {
540                         packet_buf_flush(&req_buf);
541                         send_sideband(out, -1, req_buf.buf, req_buf.len, LARGE_PACKET_MAX);
542                 }
543         } else {
544                 write_or_die(out, req_buf.buf, req_buf.len);
545                 packet_flush(out);
546         }
547         strbuf_release(&req_buf);
548         strbuf_release(&cap_buf);
549
550         if (use_sideband && cmds_sent) {
551                 memset(&demux, 0, sizeof(demux));
552                 demux.proc = sideband_demux;
553                 demux.data = fd;
554                 demux.out = -1;
555                 demux.isolate_sigpipe = 1;
556                 if (start_async(&demux))
557                         die("send-pack: unable to fork off sideband demultiplexer");
558                 in = demux.out;
559         }
560
561         packet_reader_init(&reader, in, NULL, 0,
562                            PACKET_READ_CHOMP_NEWLINE |
563                            PACKET_READ_DIE_ON_ERR_PACKET);
564
565         if (need_pack_data && cmds_sent) {
566                 if (pack_objects(out, remote_refs, extra_have, args) < 0) {
567                         for (ref = remote_refs; ref; ref = ref->next)
568                                 ref->status = REF_STATUS_NONE;
569                         if (args->stateless_rpc)
570                                 close(out);
571                         if (git_connection_is_socket(conn))
572                                 shutdown(fd[0], SHUT_WR);
573
574                         /*
575                          * Do not even bother with the return value; we know we
576                          * are failing, and just want the error() side effects.
577                          */
578                         if (status_report)
579                                 receive_unpack_status(&reader);
580
581                         if (use_sideband) {
582                                 close(demux.out);
583                                 finish_async(&demux);
584                         }
585                         fd[1] = -1;
586                         return -1;
587                 }
588                 if (!args->stateless_rpc)
589                         /* Closed by pack_objects() via start_command() */
590                         fd[1] = -1;
591         }
592         if (args->stateless_rpc && cmds_sent)
593                 packet_flush(out);
594
595         if (status_report && cmds_sent)
596                 ret = receive_status(&reader, remote_refs);
597         else
598                 ret = 0;
599         if (args->stateless_rpc)
600                 packet_flush(out);
601
602         if (use_sideband && cmds_sent) {
603                 close(demux.out);
604                 if (finish_async(&demux)) {
605                         error("error in sideband demultiplexer");
606                         ret = -1;
607                 }
608         }
609
610         if (ret < 0)
611                 return ret;
612
613         if (args->porcelain)
614                 return 0;
615
616         for (ref = remote_refs; ref; ref = ref->next) {
617                 switch (ref->status) {
618                 case REF_STATUS_NONE:
619                 case REF_STATUS_UPTODATE:
620                 case REF_STATUS_OK:
621                         break;
622                 default:
623                         return -1;
624                 }
625         }
626         return 0;
627 }