Merge branch 'nd/init-core-worktree-in-multi-worktree-world'
[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 sha1_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
76         i = 4;
77         if (args->use_thin_pack)
78                 argv[i++] = "--thin";
79         if (args->use_ofs_delta)
80                 argv[i++] = "--delta-base-offset";
81         if (args->quiet || !args->progress)
82                 argv[i++] = "-q";
83         if (args->progress)
84                 argv[i++] = "--progress";
85         if (is_repository_shallow())
86                 argv[i++] = "--shallow";
87         po.argv = argv;
88         po.in = -1;
89         po.out = args->stateless_rpc ? -1 : fd;
90         po.git_cmd = 1;
91         if (start_command(&po))
92                 die_errno("git pack-objects failed");
93
94         /*
95          * We feed the pack-objects we just spawned with revision
96          * parameters by writing to the pipe.
97          */
98         po_in = xfdopen(po.in, "w");
99         for (i = 0; i < extra->nr; i++)
100                 feed_object(extra->sha1[i], po_in, 1);
101
102         while (refs) {
103                 if (!is_null_oid(&refs->old_oid))
104                         feed_object(refs->old_oid.hash, po_in, 1);
105                 if (!is_null_oid(&refs->new_oid))
106                         feed_object(refs->new_oid.hash, po_in, 0);
107                 refs = refs->next;
108         }
109
110         fflush(po_in);
111         if (ferror(po_in))
112                 die_errno("error writing to pack-objects");
113         fclose(po_in);
114
115         if (args->stateless_rpc) {
116                 char *buf = xmalloc(LARGE_PACKET_MAX);
117                 while (1) {
118                         ssize_t n = xread(po.out, buf, LARGE_PACKET_MAX);
119                         if (n <= 0)
120                                 break;
121                         send_sideband(fd, -1, buf, n, LARGE_PACKET_MAX);
122                 }
123                 free(buf);
124                 close(po.out);
125                 po.out = -1;
126         }
127
128         if (finish_command(&po))
129                 return -1;
130         return 0;
131 }
132
133 static int receive_status(int in, struct ref *refs)
134 {
135         struct ref *hint;
136         int ret = 0;
137         char *line = packet_read_line(in, NULL);
138         if (!starts_with(line, "unpack "))
139                 return error("did not receive remote status");
140         if (strcmp(line, "unpack ok")) {
141                 error("unpack failed: %s", line + 7);
142                 ret = -1;
143         }
144         hint = NULL;
145         while (1) {
146                 char *refname;
147                 char *msg;
148                 line = packet_read_line(in, NULL);
149                 if (!line)
150                         break;
151                 if (!starts_with(line, "ok ") && !starts_with(line, "ng ")) {
152                         error("invalid ref status from remote: %s", line);
153                         ret = -1;
154                         break;
155                 }
156
157                 refname = line + 3;
158                 msg = strchr(refname, ' ');
159                 if (msg)
160                         *msg++ = '\0';
161
162                 /* first try searching at our hint, falling back to all refs */
163                 if (hint)
164                         hint = find_ref_by_name(hint, refname);
165                 if (!hint)
166                         hint = find_ref_by_name(refs, refname);
167                 if (!hint) {
168                         warning("remote reported status on unknown ref: %s",
169                                         refname);
170                         continue;
171                 }
172                 if (hint->status != REF_STATUS_EXPECTING_REPORT) {
173                         warning("remote reported status on unexpected ref: %s",
174                                         refname);
175                         continue;
176                 }
177
178                 if (line[0] == 'o' && line[1] == 'k')
179                         hint->status = REF_STATUS_OK;
180                 else {
181                         hint->status = REF_STATUS_REMOTE_REJECT;
182                         ret = -1;
183                 }
184                 if (msg)
185                         hint->remote_status = xstrdup(msg);
186                 /* start our next search from the next ref */
187                 hint = hint->next;
188         }
189         return ret;
190 }
191
192 static int sideband_demux(int in, int out, void *data)
193 {
194         int *fd = data, ret;
195 #ifdef NO_PTHREADS
196         close(fd[1]);
197 #endif
198         ret = recv_sideband("send-pack", fd[0], out);
199         close(out);
200         return ret;
201 }
202
203 static int advertise_shallow_grafts_cb(const struct commit_graft *graft, void *cb)
204 {
205         struct strbuf *sb = cb;
206         if (graft->nr_parent == -1)
207                 packet_buf_write(sb, "shallow %s\n", oid_to_hex(&graft->oid));
208         return 0;
209 }
210
211 static void advertise_shallow_grafts_buf(struct strbuf *sb)
212 {
213         if (!is_repository_shallow())
214                 return;
215         for_each_commit_graft(advertise_shallow_grafts_cb, sb);
216 }
217
218 #define CHECK_REF_NO_PUSH -1
219 #define CHECK_REF_STATUS_REJECTED -2
220 #define CHECK_REF_UPTODATE -3
221 static int check_to_send_update(const struct ref *ref, const struct send_pack_args *args)
222 {
223         if (!ref->peer_ref && !args->send_mirror)
224                 return CHECK_REF_NO_PUSH;
225
226         /* Check for statuses set by set_ref_status_for_push() */
227         switch (ref->status) {
228         case REF_STATUS_REJECT_NONFASTFORWARD:
229         case REF_STATUS_REJECT_ALREADY_EXISTS:
230         case REF_STATUS_REJECT_FETCH_FIRST:
231         case REF_STATUS_REJECT_NEEDS_FORCE:
232         case REF_STATUS_REJECT_STALE:
233         case REF_STATUS_REJECT_NODELETE:
234                 return CHECK_REF_STATUS_REJECTED;
235         case REF_STATUS_UPTODATE:
236                 return CHECK_REF_UPTODATE;
237         default:
238                 return 0;
239         }
240 }
241
242 /*
243  * the beginning of the next line, or the end of buffer.
244  *
245  * NEEDSWORK: perhaps move this to git-compat-util.h or somewhere and
246  * convert many similar uses found by "git grep -A4 memchr".
247  */
248 static const char *next_line(const char *line, size_t len)
249 {
250         const char *nl = memchr(line, '\n', len);
251         if (!nl)
252                 return line + len; /* incomplete line */
253         return nl + 1;
254 }
255
256 static int generate_push_cert(struct strbuf *req_buf,
257                               const struct ref *remote_refs,
258                               struct send_pack_args *args,
259                               const char *cap_string,
260                               const char *push_cert_nonce)
261 {
262         const struct ref *ref;
263         struct string_list_item *item;
264         char *signing_key = xstrdup(get_signing_key());
265         const char *cp, *np;
266         struct strbuf cert = STRBUF_INIT;
267         int update_seen = 0;
268
269         strbuf_addstr(&cert, "certificate version 0.1\n");
270         strbuf_addf(&cert, "pusher %s ", signing_key);
271         datestamp(&cert);
272         strbuf_addch(&cert, '\n');
273         if (args->url && *args->url) {
274                 char *anon_url = transport_anonymize_url(args->url);
275                 strbuf_addf(&cert, "pushee %s\n", anon_url);
276                 free(anon_url);
277         }
278         if (push_cert_nonce[0])
279                 strbuf_addf(&cert, "nonce %s\n", push_cert_nonce);
280         if (args->push_options)
281                 for_each_string_list_item(item, args->push_options)
282                         strbuf_addf(&cert, "push-option %s\n", item->string);
283         strbuf_addstr(&cert, "\n");
284
285         for (ref = remote_refs; ref; ref = ref->next) {
286                 if (check_to_send_update(ref, args) < 0)
287                         continue;
288                 update_seen = 1;
289                 strbuf_addf(&cert, "%s %s %s\n",
290                             oid_to_hex(&ref->old_oid),
291                             oid_to_hex(&ref->new_oid),
292                             ref->name);
293         }
294         if (!update_seen)
295                 goto free_return;
296
297         if (sign_buffer(&cert, &cert, signing_key))
298                 die(_("failed to sign the push certificate"));
299
300         packet_buf_write(req_buf, "push-cert%c%s", 0, cap_string);
301         for (cp = cert.buf; cp < cert.buf + cert.len; cp = np) {
302                 np = next_line(cp, cert.buf + cert.len - cp);
303                 packet_buf_write(req_buf,
304                                  "%.*s", (int)(np - cp), cp);
305         }
306         packet_buf_write(req_buf, "push-cert-end\n");
307
308 free_return:
309         free(signing_key);
310         strbuf_release(&cert);
311         return update_seen;
312 }
313
314
315 static int atomic_push_failure(struct send_pack_args *args,
316                                struct ref *remote_refs,
317                                struct ref *failing_ref)
318 {
319         struct ref *ref;
320         /* Mark other refs as failed */
321         for (ref = remote_refs; ref; ref = ref->next) {
322                 if (!ref->peer_ref && !args->send_mirror)
323                         continue;
324
325                 switch (ref->status) {
326                 case REF_STATUS_EXPECTING_REPORT:
327                         ref->status = REF_STATUS_ATOMIC_PUSH_FAILED;
328                         continue;
329                 default:
330                         break; /* do nothing */
331                 }
332         }
333         return error("atomic push failed for ref %s. status: %d\n",
334                      failing_ref->name, failing_ref->status);
335 }
336
337 #define NONCE_LEN_LIMIT 256
338
339 static void reject_invalid_nonce(const char *nonce, int len)
340 {
341         int i = 0;
342
343         if (NONCE_LEN_LIMIT <= len)
344                 die("the receiving end asked to sign an invalid nonce <%.*s>",
345                     len, nonce);
346
347         for (i = 0; i < len; i++) {
348                 int ch = nonce[i] & 0xFF;
349                 if (isalnum(ch) ||
350                     ch == '-' || ch == '.' ||
351                     ch == '/' || ch == '+' ||
352                     ch == '=' || ch == '_')
353                         continue;
354                 die("the receiving end asked to sign an invalid nonce <%.*s>",
355                     len, nonce);
356         }
357 }
358
359 int send_pack(struct send_pack_args *args,
360               int fd[], struct child_process *conn,
361               struct ref *remote_refs,
362               struct sha1_array *extra_have)
363 {
364         int in = fd[0];
365         int out = fd[1];
366         struct strbuf req_buf = STRBUF_INIT;
367         struct strbuf cap_buf = STRBUF_INIT;
368         struct ref *ref;
369         int need_pack_data = 0;
370         int allow_deleting_refs = 0;
371         int status_report = 0;
372         int use_sideband = 0;
373         int quiet_supported = 0;
374         int agent_supported = 0;
375         int use_atomic = 0;
376         int atomic_supported = 0;
377         int use_push_options = 0;
378         int push_options_supported = 0;
379         unsigned cmds_sent = 0;
380         int ret;
381         struct async demux;
382         const char *push_cert_nonce = NULL;
383
384         /* Does the other end support the reporting? */
385         if (server_supports("report-status"))
386                 status_report = 1;
387         if (server_supports("delete-refs"))
388                 allow_deleting_refs = 1;
389         if (server_supports("ofs-delta"))
390                 args->use_ofs_delta = 1;
391         if (server_supports("side-band-64k"))
392                 use_sideband = 1;
393         if (server_supports("quiet"))
394                 quiet_supported = 1;
395         if (server_supports("agent"))
396                 agent_supported = 1;
397         if (server_supports("no-thin"))
398                 args->use_thin_pack = 0;
399         if (server_supports("atomic"))
400                 atomic_supported = 1;
401         if (server_supports("push-options"))
402                 push_options_supported = 1;
403
404         if (args->push_cert != SEND_PACK_PUSH_CERT_NEVER) {
405                 int len;
406                 push_cert_nonce = server_feature_value("push-cert", &len);
407                 if (push_cert_nonce) {
408                         reject_invalid_nonce(push_cert_nonce, len);
409                         push_cert_nonce = xmemdupz(push_cert_nonce, len);
410                 } else if (args->push_cert == SEND_PACK_PUSH_CERT_ALWAYS) {
411                         die(_("the receiving end does not support --signed push"));
412                 } else if (args->push_cert == SEND_PACK_PUSH_CERT_IF_ASKED) {
413                         warning(_("not sending a push certificate since the"
414                                   " receiving end does not support --signed"
415                                   " push"));
416                 }
417         }
418
419         if (!remote_refs) {
420                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
421                         "Perhaps you should specify a branch such as 'master'.\n");
422                 return 0;
423         }
424         if (args->atomic && !atomic_supported)
425                 die(_("the receiving end does not support --atomic push"));
426
427         use_atomic = atomic_supported && args->atomic;
428
429         if (args->push_options && !push_options_supported)
430                 die(_("the receiving end does not support push options"));
431
432         use_push_options = push_options_supported && args->push_options;
433
434         if (status_report)
435                 strbuf_addstr(&cap_buf, " report-status");
436         if (use_sideband)
437                 strbuf_addstr(&cap_buf, " side-band-64k");
438         if (quiet_supported && (args->quiet || !args->progress))
439                 strbuf_addstr(&cap_buf, " quiet");
440         if (use_atomic)
441                 strbuf_addstr(&cap_buf, " atomic");
442         if (use_push_options)
443                 strbuf_addstr(&cap_buf, " push-options");
444         if (agent_supported)
445                 strbuf_addf(&cap_buf, " agent=%s", git_user_agent_sanitized());
446
447         /*
448          * NEEDSWORK: why does delete-refs have to be so specific to
449          * send-pack machinery that set_ref_status_for_push() cannot
450          * set this bit for us???
451          */
452         for (ref = remote_refs; ref; ref = ref->next)
453                 if (ref->deletion && !allow_deleting_refs)
454                         ref->status = REF_STATUS_REJECT_NODELETE;
455
456         if (!args->dry_run)
457                 advertise_shallow_grafts_buf(&req_buf);
458
459         if (!args->dry_run && push_cert_nonce)
460                 cmds_sent = generate_push_cert(&req_buf, remote_refs, args,
461                                                cap_buf.buf, push_cert_nonce);
462
463         /*
464          * Clear the status for each ref and see if we need to send
465          * the pack data.
466          */
467         for (ref = remote_refs; ref; ref = ref->next) {
468                 switch (check_to_send_update(ref, args)) {
469                 case 0: /* no error */
470                         break;
471                 case CHECK_REF_STATUS_REJECTED:
472                         /*
473                          * When we know the server would reject a ref update if
474                          * we were to send it and we're trying to send the refs
475                          * atomically, abort the whole operation.
476                          */
477                         if (use_atomic)
478                                 return atomic_push_failure(args, remote_refs, ref);
479                         /* Fallthrough for non atomic case. */
480                 default:
481                         continue;
482                 }
483                 if (!ref->deletion)
484                         need_pack_data = 1;
485
486                 if (args->dry_run || !status_report)
487                         ref->status = REF_STATUS_OK;
488                 else
489                         ref->status = REF_STATUS_EXPECTING_REPORT;
490         }
491
492         /*
493          * Finally, tell the other end!
494          */
495         for (ref = remote_refs; ref; ref = ref->next) {
496                 char *old_hex, *new_hex;
497
498                 if (args->dry_run || push_cert_nonce)
499                         continue;
500
501                 if (check_to_send_update(ref, args) < 0)
502                         continue;
503
504                 old_hex = oid_to_hex(&ref->old_oid);
505                 new_hex = oid_to_hex(&ref->new_oid);
506                 if (!cmds_sent) {
507                         packet_buf_write(&req_buf,
508                                          "%s %s %s%c%s",
509                                          old_hex, new_hex, ref->name, 0,
510                                          cap_buf.buf);
511                         cmds_sent = 1;
512                 } else {
513                         packet_buf_write(&req_buf, "%s %s %s",
514                                          old_hex, new_hex, ref->name);
515                 }
516         }
517
518         if (args->stateless_rpc) {
519                 if (!args->dry_run && (cmds_sent || is_repository_shallow())) {
520                         packet_buf_flush(&req_buf);
521                         send_sideband(out, -1, req_buf.buf, req_buf.len, LARGE_PACKET_MAX);
522                 }
523         } else {
524                 write_or_die(out, req_buf.buf, req_buf.len);
525                 packet_flush(out);
526         }
527         strbuf_release(&req_buf);
528         strbuf_release(&cap_buf);
529
530         if (use_push_options) {
531                 struct string_list_item *item;
532                 struct strbuf sb = STRBUF_INIT;
533
534                 for_each_string_list_item(item, args->push_options)
535                         packet_buf_write(&sb, "%s", item->string);
536
537                 write_or_die(out, sb.buf, sb.len);
538                 packet_flush(out);
539                 strbuf_release(&sb);
540         }
541
542         if (use_sideband && cmds_sent) {
543                 memset(&demux, 0, sizeof(demux));
544                 demux.proc = sideband_demux;
545                 demux.data = fd;
546                 demux.out = -1;
547                 demux.isolate_sigpipe = 1;
548                 if (start_async(&demux))
549                         die("send-pack: unable to fork off sideband demultiplexer");
550                 in = demux.out;
551         }
552
553         if (need_pack_data && cmds_sent) {
554                 if (pack_objects(out, remote_refs, extra_have, args) < 0) {
555                         for (ref = remote_refs; ref; ref = ref->next)
556                                 ref->status = REF_STATUS_NONE;
557                         if (args->stateless_rpc)
558                                 close(out);
559                         if (git_connection_is_socket(conn))
560                                 shutdown(fd[0], SHUT_WR);
561                         if (use_sideband) {
562                                 close(demux.out);
563                                 finish_async(&demux);
564                         }
565                         fd[1] = -1;
566                         return -1;
567                 }
568                 if (!args->stateless_rpc)
569                         /* Closed by pack_objects() via start_command() */
570                         fd[1] = -1;
571         }
572         if (args->stateless_rpc && cmds_sent)
573                 packet_flush(out);
574
575         if (status_report && cmds_sent)
576                 ret = receive_status(in, remote_refs);
577         else
578                 ret = 0;
579         if (args->stateless_rpc)
580                 packet_flush(out);
581
582         if (use_sideband && cmds_sent) {
583                 close(demux.out);
584                 if (finish_async(&demux)) {
585                         error("error in sideband demultiplexer");
586                         ret = -1;
587                 }
588         }
589
590         if (ret < 0)
591                 return ret;
592
593         if (args->porcelain)
594                 return 0;
595
596         for (ref = remote_refs; ref; ref = ref->next) {
597                 switch (ref->status) {
598                 case REF_STATUS_NONE:
599                 case REF_STATUS_UPTODATE:
600                 case REF_STATUS_OK:
601                         break;
602                 default:
603                         return -1;
604                 }
605         }
606         return 0;
607 }