Merge branch 'pm/build-persistent-https-with-recent-go'
[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         char *signing_key = xstrdup(get_signing_key());
264         const char *cp, *np;
265         struct strbuf cert = STRBUF_INIT;
266         int update_seen = 0;
267
268         strbuf_addf(&cert, "certificate version 0.1\n");
269         strbuf_addf(&cert, "pusher %s ", signing_key);
270         datestamp(&cert);
271         strbuf_addch(&cert, '\n');
272         if (args->url && *args->url) {
273                 char *anon_url = transport_anonymize_url(args->url);
274                 strbuf_addf(&cert, "pushee %s\n", anon_url);
275                 free(anon_url);
276         }
277         if (push_cert_nonce[0])
278                 strbuf_addf(&cert, "nonce %s\n", push_cert_nonce);
279         strbuf_addstr(&cert, "\n");
280
281         for (ref = remote_refs; ref; ref = ref->next) {
282                 if (check_to_send_update(ref, args) < 0)
283                         continue;
284                 update_seen = 1;
285                 strbuf_addf(&cert, "%s %s %s\n",
286                             oid_to_hex(&ref->old_oid),
287                             oid_to_hex(&ref->new_oid),
288                             ref->name);
289         }
290         if (!update_seen)
291                 goto free_return;
292
293         if (sign_buffer(&cert, &cert, signing_key))
294                 die(_("failed to sign the push certificate"));
295
296         packet_buf_write(req_buf, "push-cert%c%s", 0, cap_string);
297         for (cp = cert.buf; cp < cert.buf + cert.len; cp = np) {
298                 np = next_line(cp, cert.buf + cert.len - cp);
299                 packet_buf_write(req_buf,
300                                  "%.*s", (int)(np - cp), cp);
301         }
302         packet_buf_write(req_buf, "push-cert-end\n");
303
304 free_return:
305         free(signing_key);
306         strbuf_release(&cert);
307         return update_seen;
308 }
309
310
311 static int atomic_push_failure(struct send_pack_args *args,
312                                struct ref *remote_refs,
313                                struct ref *failing_ref)
314 {
315         struct ref *ref;
316         /* Mark other refs as failed */
317         for (ref = remote_refs; ref; ref = ref->next) {
318                 if (!ref->peer_ref && !args->send_mirror)
319                         continue;
320
321                 switch (ref->status) {
322                 case REF_STATUS_EXPECTING_REPORT:
323                         ref->status = REF_STATUS_ATOMIC_PUSH_FAILED;
324                         continue;
325                 default:
326                         break; /* do nothing */
327                 }
328         }
329         return error("atomic push failed for ref %s. status: %d\n",
330                      failing_ref->name, failing_ref->status);
331 }
332
333 #define NONCE_LEN_LIMIT 256
334
335 static void reject_invalid_nonce(const char *nonce, int len)
336 {
337         int i = 0;
338
339         if (NONCE_LEN_LIMIT <= len)
340                 die("the receiving end asked to sign an invalid nonce <%.*s>",
341                     len, nonce);
342
343         for (i = 0; i < len; i++) {
344                 int ch = nonce[i] & 0xFF;
345                 if (isalnum(ch) ||
346                     ch == '-' || ch == '.' ||
347                     ch == '/' || ch == '+' ||
348                     ch == '=' || ch == '_')
349                         continue;
350                 die("the receiving end asked to sign an invalid nonce <%.*s>",
351                     len, nonce);
352         }
353 }
354
355 int send_pack(struct send_pack_args *args,
356               int fd[], struct child_process *conn,
357               struct ref *remote_refs,
358               struct sha1_array *extra_have)
359 {
360         int in = fd[0];
361         int out = fd[1];
362         struct strbuf req_buf = STRBUF_INIT;
363         struct strbuf cap_buf = STRBUF_INIT;
364         struct ref *ref;
365         int need_pack_data = 0;
366         int allow_deleting_refs = 0;
367         int status_report = 0;
368         int use_sideband = 0;
369         int quiet_supported = 0;
370         int agent_supported = 0;
371         int use_atomic = 0;
372         int atomic_supported = 0;
373         unsigned cmds_sent = 0;
374         int ret;
375         struct async demux;
376         const char *push_cert_nonce = NULL;
377
378         /* Does the other end support the reporting? */
379         if (server_supports("report-status"))
380                 status_report = 1;
381         if (server_supports("delete-refs"))
382                 allow_deleting_refs = 1;
383         if (server_supports("ofs-delta"))
384                 args->use_ofs_delta = 1;
385         if (server_supports("side-band-64k"))
386                 use_sideband = 1;
387         if (server_supports("quiet"))
388                 quiet_supported = 1;
389         if (server_supports("agent"))
390                 agent_supported = 1;
391         if (server_supports("no-thin"))
392                 args->use_thin_pack = 0;
393         if (server_supports("atomic"))
394                 atomic_supported = 1;
395
396         if (args->push_cert != SEND_PACK_PUSH_CERT_NEVER) {
397                 int len;
398                 push_cert_nonce = server_feature_value("push-cert", &len);
399                 if (push_cert_nonce) {
400                         reject_invalid_nonce(push_cert_nonce, len);
401                         push_cert_nonce = xmemdupz(push_cert_nonce, len);
402                 } else if (args->push_cert == SEND_PACK_PUSH_CERT_ALWAYS) {
403                         die(_("the receiving end does not support --signed push"));
404                 } else if (args->push_cert == SEND_PACK_PUSH_CERT_IF_ASKED) {
405                         warning(_("not sending a push certificate since the"
406                                   " receiving end does not support --signed"
407                                   " push"));
408                 }
409         }
410
411         if (!remote_refs) {
412                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
413                         "Perhaps you should specify a branch such as 'master'.\n");
414                 return 0;
415         }
416         if (args->atomic && !atomic_supported)
417                 die(_("the receiving end does not support --atomic push"));
418
419         use_atomic = atomic_supported && args->atomic;
420
421         if (status_report)
422                 strbuf_addstr(&cap_buf, " report-status");
423         if (use_sideband)
424                 strbuf_addstr(&cap_buf, " side-band-64k");
425         if (quiet_supported && (args->quiet || !args->progress))
426                 strbuf_addstr(&cap_buf, " quiet");
427         if (use_atomic)
428                 strbuf_addstr(&cap_buf, " atomic");
429         if (agent_supported)
430                 strbuf_addf(&cap_buf, " agent=%s", git_user_agent_sanitized());
431
432         /*
433          * NEEDSWORK: why does delete-refs have to be so specific to
434          * send-pack machinery that set_ref_status_for_push() cannot
435          * set this bit for us???
436          */
437         for (ref = remote_refs; ref; ref = ref->next)
438                 if (ref->deletion && !allow_deleting_refs)
439                         ref->status = REF_STATUS_REJECT_NODELETE;
440
441         if (!args->dry_run)
442                 advertise_shallow_grafts_buf(&req_buf);
443
444         if (!args->dry_run && push_cert_nonce)
445                 cmds_sent = generate_push_cert(&req_buf, remote_refs, args,
446                                                cap_buf.buf, push_cert_nonce);
447
448         /*
449          * Clear the status for each ref and see if we need to send
450          * the pack data.
451          */
452         for (ref = remote_refs; ref; ref = ref->next) {
453                 switch (check_to_send_update(ref, args)) {
454                 case 0: /* no error */
455                         break;
456                 case CHECK_REF_STATUS_REJECTED:
457                         /*
458                          * When we know the server would reject a ref update if
459                          * we were to send it and we're trying to send the refs
460                          * atomically, abort the whole operation.
461                          */
462                         if (use_atomic)
463                                 return atomic_push_failure(args, remote_refs, ref);
464                         /* Fallthrough for non atomic case. */
465                 default:
466                         continue;
467                 }
468                 if (!ref->deletion)
469                         need_pack_data = 1;
470
471                 if (args->dry_run || !status_report)
472                         ref->status = REF_STATUS_OK;
473                 else
474                         ref->status = REF_STATUS_EXPECTING_REPORT;
475         }
476
477         /*
478          * Finally, tell the other end!
479          */
480         for (ref = remote_refs; ref; ref = ref->next) {
481                 char *old_hex, *new_hex;
482
483                 if (args->dry_run || push_cert_nonce)
484                         continue;
485
486                 if (check_to_send_update(ref, args) < 0)
487                         continue;
488
489                 old_hex = oid_to_hex(&ref->old_oid);
490                 new_hex = oid_to_hex(&ref->new_oid);
491                 if (!cmds_sent) {
492                         packet_buf_write(&req_buf,
493                                          "%s %s %s%c%s",
494                                          old_hex, new_hex, ref->name, 0,
495                                          cap_buf.buf);
496                         cmds_sent = 1;
497                 } else {
498                         packet_buf_write(&req_buf, "%s %s %s",
499                                          old_hex, new_hex, ref->name);
500                 }
501         }
502
503         if (args->stateless_rpc) {
504                 if (!args->dry_run && (cmds_sent || is_repository_shallow())) {
505                         packet_buf_flush(&req_buf);
506                         send_sideband(out, -1, req_buf.buf, req_buf.len, LARGE_PACKET_MAX);
507                 }
508         } else {
509                 write_or_die(out, req_buf.buf, req_buf.len);
510                 packet_flush(out);
511         }
512         strbuf_release(&req_buf);
513         strbuf_release(&cap_buf);
514
515         if (use_sideband && cmds_sent) {
516                 memset(&demux, 0, sizeof(demux));
517                 demux.proc = sideband_demux;
518                 demux.data = fd;
519                 demux.out = -1;
520                 demux.isolate_sigpipe = 1;
521                 if (start_async(&demux))
522                         die("send-pack: unable to fork off sideband demultiplexer");
523                 in = demux.out;
524         }
525
526         if (need_pack_data && cmds_sent) {
527                 if (pack_objects(out, remote_refs, extra_have, args) < 0) {
528                         for (ref = remote_refs; ref; ref = ref->next)
529                                 ref->status = REF_STATUS_NONE;
530                         if (args->stateless_rpc)
531                                 close(out);
532                         if (git_connection_is_socket(conn))
533                                 shutdown(fd[0], SHUT_WR);
534                         if (use_sideband) {
535                                 close(demux.out);
536                                 finish_async(&demux);
537                         }
538                         fd[1] = -1;
539                         return -1;
540                 }
541                 if (!args->stateless_rpc)
542                         /* Closed by pack_objects() via start_command() */
543                         fd[1] = -1;
544         }
545         if (args->stateless_rpc && cmds_sent)
546                 packet_flush(out);
547
548         if (status_report && cmds_sent)
549                 ret = receive_status(in, remote_refs);
550         else
551                 ret = 0;
552         if (args->stateless_rpc)
553                 packet_flush(out);
554
555         if (use_sideband && cmds_sent) {
556                 close(demux.out);
557                 if (finish_async(&demux)) {
558                         error("error in sideband demultiplexer");
559                         ret = -1;
560                 }
561         }
562
563         if (ret < 0)
564                 return ret;
565
566         if (args->porcelain)
567                 return 0;
568
569         for (ref = remote_refs; ref; ref = ref->next) {
570                 switch (ref->status) {
571                 case REF_STATUS_NONE:
572                 case REF_STATUS_UPTODATE:
573                 case REF_STATUS_OK:
574                         break;
575                 default:
576                         return -1;
577                 }
578         }
579         return 0;
580 }