commit-graph: implement git-commit-graph write
[git] / transport.c
1 #include "cache.h"
2 #include "config.h"
3 #include "transport.h"
4 #include "run-command.h"
5 #include "pkt-line.h"
6 #include "fetch-pack.h"
7 #include "remote.h"
8 #include "connect.h"
9 #include "send-pack.h"
10 #include "walker.h"
11 #include "bundle.h"
12 #include "dir.h"
13 #include "refs.h"
14 #include "branch.h"
15 #include "url.h"
16 #include "submodule.h"
17 #include "string-list.h"
18 #include "sha1-array.h"
19 #include "sigchain.h"
20 #include "transport-internal.h"
21
22 static void set_upstreams(struct transport *transport, struct ref *refs,
23         int pretend)
24 {
25         struct ref *ref;
26         for (ref = refs; ref; ref = ref->next) {
27                 const char *localname;
28                 const char *tmp;
29                 const char *remotename;
30                 int flag = 0;
31                 /*
32                  * Check suitability for tracking. Must be successful /
33                  * already up-to-date ref create/modify (not delete).
34                  */
35                 if (ref->status != REF_STATUS_OK &&
36                         ref->status != REF_STATUS_UPTODATE)
37                         continue;
38                 if (!ref->peer_ref)
39                         continue;
40                 if (is_null_oid(&ref->new_oid))
41                         continue;
42
43                 /* Follow symbolic refs (mainly for HEAD). */
44                 localname = ref->peer_ref->name;
45                 remotename = ref->name;
46                 tmp = resolve_ref_unsafe(localname, RESOLVE_REF_READING,
47                                          NULL, &flag);
48                 if (tmp && flag & REF_ISSYMREF &&
49                         starts_with(tmp, "refs/heads/"))
50                         localname = tmp;
51
52                 /* Both source and destination must be local branches. */
53                 if (!localname || !starts_with(localname, "refs/heads/"))
54                         continue;
55                 if (!remotename || !starts_with(remotename, "refs/heads/"))
56                         continue;
57
58                 if (!pretend)
59                         install_branch_config(BRANCH_CONFIG_VERBOSE,
60                                 localname + 11, transport->remote->name,
61                                 remotename);
62                 else
63                         printf(_("Would set upstream of '%s' to '%s' of '%s'\n"),
64                                 localname + 11, remotename + 11,
65                                 transport->remote->name);
66         }
67 }
68
69 struct bundle_transport_data {
70         int fd;
71         struct bundle_header header;
72 };
73
74 static struct ref *get_refs_from_bundle(struct transport *transport, int for_push)
75 {
76         struct bundle_transport_data *data = transport->data;
77         struct ref *result = NULL;
78         int i;
79
80         if (for_push)
81                 return NULL;
82
83         if (data->fd > 0)
84                 close(data->fd);
85         data->fd = read_bundle_header(transport->url, &data->header);
86         if (data->fd < 0)
87                 die ("Could not read bundle '%s'.", transport->url);
88         for (i = 0; i < data->header.references.nr; i++) {
89                 struct ref_list_entry *e = data->header.references.list + i;
90                 struct ref *ref = alloc_ref(e->name);
91                 oidcpy(&ref->old_oid, &e->oid);
92                 ref->next = result;
93                 result = ref;
94         }
95         return result;
96 }
97
98 static int fetch_refs_from_bundle(struct transport *transport,
99                                int nr_heads, struct ref **to_fetch)
100 {
101         struct bundle_transport_data *data = transport->data;
102         return unbundle(&data->header, data->fd,
103                         transport->progress ? BUNDLE_VERBOSE : 0);
104 }
105
106 static int close_bundle(struct transport *transport)
107 {
108         struct bundle_transport_data *data = transport->data;
109         if (data->fd > 0)
110                 close(data->fd);
111         free(data);
112         return 0;
113 }
114
115 struct git_transport_data {
116         struct git_transport_options options;
117         struct child_process *conn;
118         int fd[2];
119         unsigned got_remote_heads : 1;
120         struct oid_array extra_have;
121         struct oid_array shallow;
122 };
123
124 static int set_git_option(struct git_transport_options *opts,
125                           const char *name, const char *value)
126 {
127         if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
128                 opts->uploadpack = value;
129                 return 0;
130         } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
131                 opts->receivepack = value;
132                 return 0;
133         } else if (!strcmp(name, TRANS_OPT_THIN)) {
134                 opts->thin = !!value;
135                 return 0;
136         } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
137                 opts->followtags = !!value;
138                 return 0;
139         } else if (!strcmp(name, TRANS_OPT_KEEP)) {
140                 opts->keep = !!value;
141                 return 0;
142         } else if (!strcmp(name, TRANS_OPT_UPDATE_SHALLOW)) {
143                 opts->update_shallow = !!value;
144                 return 0;
145         } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
146                 if (!value)
147                         opts->depth = 0;
148                 else {
149                         char *end;
150                         opts->depth = strtol(value, &end, 0);
151                         if (*end)
152                                 die(_("transport: invalid depth option '%s'"), value);
153                 }
154                 return 0;
155         } else if (!strcmp(name, TRANS_OPT_DEEPEN_SINCE)) {
156                 opts->deepen_since = value;
157                 return 0;
158         } else if (!strcmp(name, TRANS_OPT_DEEPEN_NOT)) {
159                 opts->deepen_not = (const struct string_list *)value;
160                 return 0;
161         } else if (!strcmp(name, TRANS_OPT_DEEPEN_RELATIVE)) {
162                 opts->deepen_relative = !!value;
163                 return 0;
164         } else if (!strcmp(name, TRANS_OPT_FROM_PROMISOR)) {
165                 opts->from_promisor = !!value;
166                 return 0;
167         } else if (!strcmp(name, TRANS_OPT_NO_DEPENDENTS)) {
168                 opts->no_dependents = !!value;
169                 return 0;
170         } else if (!strcmp(name, TRANS_OPT_LIST_OBJECTS_FILTER)) {
171                 parse_list_objects_filter(&opts->filter_options, value);
172                 return 0;
173         }
174         return 1;
175 }
176
177 static int connect_setup(struct transport *transport, int for_push)
178 {
179         struct git_transport_data *data = transport->data;
180         int flags = transport->verbose > 0 ? CONNECT_VERBOSE : 0;
181
182         if (data->conn)
183                 return 0;
184
185         switch (transport->family) {
186         case TRANSPORT_FAMILY_ALL: break;
187         case TRANSPORT_FAMILY_IPV4: flags |= CONNECT_IPV4; break;
188         case TRANSPORT_FAMILY_IPV6: flags |= CONNECT_IPV6; break;
189         }
190
191         data->conn = git_connect(data->fd, transport->url,
192                                  for_push ? data->options.receivepack :
193                                  data->options.uploadpack,
194                                  flags);
195
196         return 0;
197 }
198
199 static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
200 {
201         struct git_transport_data *data = transport->data;
202         struct ref *refs;
203
204         connect_setup(transport, for_push);
205         get_remote_heads(data->fd[0], NULL, 0, &refs,
206                          for_push ? REF_NORMAL : 0,
207                          &data->extra_have,
208                          &data->shallow);
209         data->got_remote_heads = 1;
210
211         return refs;
212 }
213
214 static int fetch_refs_via_pack(struct transport *transport,
215                                int nr_heads, struct ref **to_fetch)
216 {
217         int ret = 0;
218         struct git_transport_data *data = transport->data;
219         struct ref *refs;
220         char *dest = xstrdup(transport->url);
221         struct fetch_pack_args args;
222         struct ref *refs_tmp = NULL;
223
224         memset(&args, 0, sizeof(args));
225         args.uploadpack = data->options.uploadpack;
226         args.keep_pack = data->options.keep;
227         args.lock_pack = 1;
228         args.use_thin_pack = data->options.thin;
229         args.include_tag = data->options.followtags;
230         args.verbose = (transport->verbose > 1);
231         args.quiet = (transport->verbose < 0);
232         args.no_progress = !transport->progress;
233         args.depth = data->options.depth;
234         args.deepen_since = data->options.deepen_since;
235         args.deepen_not = data->options.deepen_not;
236         args.deepen_relative = data->options.deepen_relative;
237         args.check_self_contained_and_connected =
238                 data->options.check_self_contained_and_connected;
239         args.cloning = transport->cloning;
240         args.update_shallow = data->options.update_shallow;
241         args.from_promisor = data->options.from_promisor;
242         args.no_dependents = data->options.no_dependents;
243         args.filter_options = data->options.filter_options;
244
245         if (!data->got_remote_heads) {
246                 connect_setup(transport, 0);
247                 get_remote_heads(data->fd[0], NULL, 0, &refs_tmp, 0,
248                                  NULL, &data->shallow);
249                 data->got_remote_heads = 1;
250         }
251
252         refs = fetch_pack(&args, data->fd, data->conn,
253                           refs_tmp ? refs_tmp : transport->remote_refs,
254                           dest, to_fetch, nr_heads, &data->shallow,
255                           &transport->pack_lockfile);
256         close(data->fd[0]);
257         close(data->fd[1]);
258         if (finish_connect(data->conn))
259                 ret = -1;
260         data->conn = NULL;
261         data->got_remote_heads = 0;
262         data->options.self_contained_and_connected =
263                 args.self_contained_and_connected;
264
265         if (refs == NULL)
266                 ret = -1;
267         if (report_unmatched_refs(to_fetch, nr_heads))
268                 ret = -1;
269
270         free_refs(refs_tmp);
271         free_refs(refs);
272         free(dest);
273         return ret;
274 }
275
276 static int push_had_errors(struct ref *ref)
277 {
278         for (; ref; ref = ref->next) {
279                 switch (ref->status) {
280                 case REF_STATUS_NONE:
281                 case REF_STATUS_UPTODATE:
282                 case REF_STATUS_OK:
283                         break;
284                 default:
285                         return 1;
286                 }
287         }
288         return 0;
289 }
290
291 int transport_refs_pushed(struct ref *ref)
292 {
293         for (; ref; ref = ref->next) {
294                 switch(ref->status) {
295                 case REF_STATUS_NONE:
296                 case REF_STATUS_UPTODATE:
297                         break;
298                 default:
299                         return 1;
300                 }
301         }
302         return 0;
303 }
304
305 void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
306 {
307         struct refspec rs;
308
309         if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
310                 return;
311
312         rs.src = ref->name;
313         rs.dst = NULL;
314
315         if (!remote_find_tracking(remote, &rs)) {
316                 if (verbose)
317                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
318                 if (ref->deletion) {
319                         delete_ref(NULL, rs.dst, NULL, 0);
320                 } else
321                         update_ref("update by push", rs.dst, &ref->new_oid,
322                                    NULL, 0, 0);
323                 free(rs.dst);
324         }
325 }
326
327 static void print_ref_status(char flag, const char *summary,
328                              struct ref *to, struct ref *from, const char *msg,
329                              int porcelain, int summary_width)
330 {
331         if (porcelain) {
332                 if (from)
333                         fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
334                 else
335                         fprintf(stdout, "%c\t:%s\t", flag, to->name);
336                 if (msg)
337                         fprintf(stdout, "%s (%s)\n", summary, msg);
338                 else
339                         fprintf(stdout, "%s\n", summary);
340         } else {
341                 fprintf(stderr, " %c %-*s ", flag, summary_width, summary);
342                 if (from)
343                         fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
344                 else
345                         fputs(prettify_refname(to->name), stderr);
346                 if (msg) {
347                         fputs(" (", stderr);
348                         fputs(msg, stderr);
349                         fputc(')', stderr);
350                 }
351                 fputc('\n', stderr);
352         }
353 }
354
355 static void print_ok_ref_status(struct ref *ref, int porcelain, int summary_width)
356 {
357         if (ref->deletion)
358                 print_ref_status('-', "[deleted]", ref, NULL, NULL,
359                                  porcelain, summary_width);
360         else if (is_null_oid(&ref->old_oid))
361                 print_ref_status('*',
362                         (starts_with(ref->name, "refs/tags/") ? "[new tag]" :
363                         "[new branch]"),
364                         ref, ref->peer_ref, NULL, porcelain, summary_width);
365         else {
366                 struct strbuf quickref = STRBUF_INIT;
367                 char type;
368                 const char *msg;
369
370                 strbuf_add_unique_abbrev(&quickref, ref->old_oid.hash,
371                                          DEFAULT_ABBREV);
372                 if (ref->forced_update) {
373                         strbuf_addstr(&quickref, "...");
374                         type = '+';
375                         msg = "forced update";
376                 } else {
377                         strbuf_addstr(&quickref, "..");
378                         type = ' ';
379                         msg = NULL;
380                 }
381                 strbuf_add_unique_abbrev(&quickref, ref->new_oid.hash,
382                                          DEFAULT_ABBREV);
383
384                 print_ref_status(type, quickref.buf, ref, ref->peer_ref, msg,
385                                  porcelain, summary_width);
386                 strbuf_release(&quickref);
387         }
388 }
389
390 static int print_one_push_status(struct ref *ref, const char *dest, int count,
391                                  int porcelain, int summary_width)
392 {
393         if (!count) {
394                 char *url = transport_anonymize_url(dest);
395                 fprintf(porcelain ? stdout : stderr, "To %s\n", url);
396                 free(url);
397         }
398
399         switch(ref->status) {
400         case REF_STATUS_NONE:
401                 print_ref_status('X', "[no match]", ref, NULL, NULL,
402                                  porcelain, summary_width);
403                 break;
404         case REF_STATUS_REJECT_NODELETE:
405                 print_ref_status('!', "[rejected]", ref, NULL,
406                                  "remote does not support deleting refs",
407                                  porcelain, summary_width);
408                 break;
409         case REF_STATUS_UPTODATE:
410                 print_ref_status('=', "[up to date]", ref,
411                                  ref->peer_ref, NULL, porcelain, summary_width);
412                 break;
413         case REF_STATUS_REJECT_NONFASTFORWARD:
414                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
415                                  "non-fast-forward", porcelain, summary_width);
416                 break;
417         case REF_STATUS_REJECT_ALREADY_EXISTS:
418                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
419                                  "already exists", porcelain, summary_width);
420                 break;
421         case REF_STATUS_REJECT_FETCH_FIRST:
422                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
423                                  "fetch first", porcelain, summary_width);
424                 break;
425         case REF_STATUS_REJECT_NEEDS_FORCE:
426                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
427                                  "needs force", porcelain, summary_width);
428                 break;
429         case REF_STATUS_REJECT_STALE:
430                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
431                                  "stale info", porcelain, summary_width);
432                 break;
433         case REF_STATUS_REJECT_SHALLOW:
434                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
435                                  "new shallow roots not allowed",
436                                  porcelain, summary_width);
437                 break;
438         case REF_STATUS_REMOTE_REJECT:
439                 print_ref_status('!', "[remote rejected]", ref,
440                                  ref->deletion ? NULL : ref->peer_ref,
441                                  ref->remote_status, porcelain, summary_width);
442                 break;
443         case REF_STATUS_EXPECTING_REPORT:
444                 print_ref_status('!', "[remote failure]", ref,
445                                  ref->deletion ? NULL : ref->peer_ref,
446                                  "remote failed to report status",
447                                  porcelain, summary_width);
448                 break;
449         case REF_STATUS_ATOMIC_PUSH_FAILED:
450                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
451                                  "atomic push failed", porcelain, summary_width);
452                 break;
453         case REF_STATUS_OK:
454                 print_ok_ref_status(ref, porcelain, summary_width);
455                 break;
456         }
457
458         return 1;
459 }
460
461 static int measure_abbrev(const struct object_id *oid, int sofar)
462 {
463         char hex[GIT_MAX_HEXSZ + 1];
464         int w = find_unique_abbrev_r(hex, oid->hash, DEFAULT_ABBREV);
465
466         return (w < sofar) ? sofar : w;
467 }
468
469 int transport_summary_width(const struct ref *refs)
470 {
471         int maxw = -1;
472
473         for (; refs; refs = refs->next) {
474                 maxw = measure_abbrev(&refs->old_oid, maxw);
475                 maxw = measure_abbrev(&refs->new_oid, maxw);
476         }
477         if (maxw < 0)
478                 maxw = FALLBACK_DEFAULT_ABBREV;
479         return (2 * maxw + 3);
480 }
481
482 void transport_print_push_status(const char *dest, struct ref *refs,
483                                   int verbose, int porcelain, unsigned int *reject_reasons)
484 {
485         struct ref *ref;
486         int n = 0;
487         char *head;
488         int summary_width = transport_summary_width(refs);
489
490         head = resolve_refdup("HEAD", RESOLVE_REF_READING, NULL, NULL);
491
492         if (verbose) {
493                 for (ref = refs; ref; ref = ref->next)
494                         if (ref->status == REF_STATUS_UPTODATE)
495                                 n += print_one_push_status(ref, dest, n,
496                                                            porcelain, summary_width);
497         }
498
499         for (ref = refs; ref; ref = ref->next)
500                 if (ref->status == REF_STATUS_OK)
501                         n += print_one_push_status(ref, dest, n,
502                                                    porcelain, summary_width);
503
504         *reject_reasons = 0;
505         for (ref = refs; ref; ref = ref->next) {
506                 if (ref->status != REF_STATUS_NONE &&
507                     ref->status != REF_STATUS_UPTODATE &&
508                     ref->status != REF_STATUS_OK)
509                         n += print_one_push_status(ref, dest, n,
510                                                    porcelain, summary_width);
511                 if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
512                         if (head != NULL && !strcmp(head, ref->name))
513                                 *reject_reasons |= REJECT_NON_FF_HEAD;
514                         else
515                                 *reject_reasons |= REJECT_NON_FF_OTHER;
516                 } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
517                         *reject_reasons |= REJECT_ALREADY_EXISTS;
518                 } else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
519                         *reject_reasons |= REJECT_FETCH_FIRST;
520                 } else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
521                         *reject_reasons |= REJECT_NEEDS_FORCE;
522                 }
523         }
524         free(head);
525 }
526
527 void transport_verify_remote_names(int nr_heads, const char **heads)
528 {
529         int i;
530
531         for (i = 0; i < nr_heads; i++) {
532                 const char *local = heads[i];
533                 const char *remote = strrchr(heads[i], ':');
534
535                 if (*local == '+')
536                         local++;
537
538                 /* A matching refspec is okay.  */
539                 if (remote == local && remote[1] == '\0')
540                         continue;
541
542                 remote = remote ? (remote + 1) : local;
543                 if (check_refname_format(remote,
544                                 REFNAME_ALLOW_ONELEVEL|REFNAME_REFSPEC_PATTERN))
545                         die("remote part of refspec is not a valid name in %s",
546                                 heads[i]);
547         }
548 }
549
550 static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
551 {
552         struct git_transport_data *data = transport->data;
553         struct send_pack_args args;
554         int ret;
555
556         if (!data->got_remote_heads) {
557                 struct ref *tmp_refs;
558                 connect_setup(transport, 1);
559
560                 get_remote_heads(data->fd[0], NULL, 0, &tmp_refs, REF_NORMAL,
561                                  NULL, &data->shallow);
562                 data->got_remote_heads = 1;
563         }
564
565         memset(&args, 0, sizeof(args));
566         args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
567         args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
568         args.use_thin_pack = data->options.thin;
569         args.verbose = (transport->verbose > 0);
570         args.quiet = (transport->verbose < 0);
571         args.progress = transport->progress;
572         args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
573         args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
574         args.atomic = !!(flags & TRANSPORT_PUSH_ATOMIC);
575         args.push_options = transport->push_options;
576         args.url = transport->url;
577
578         if (flags & TRANSPORT_PUSH_CERT_ALWAYS)
579                 args.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
580         else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED)
581                 args.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
582         else
583                 args.push_cert = SEND_PACK_PUSH_CERT_NEVER;
584
585         ret = send_pack(&args, data->fd, data->conn, remote_refs,
586                         &data->extra_have);
587
588         close(data->fd[1]);
589         close(data->fd[0]);
590         ret |= finish_connect(data->conn);
591         data->conn = NULL;
592         data->got_remote_heads = 0;
593
594         return ret;
595 }
596
597 static int connect_git(struct transport *transport, const char *name,
598                        const char *executable, int fd[2])
599 {
600         struct git_transport_data *data = transport->data;
601         data->conn = git_connect(data->fd, transport->url,
602                                  executable, 0);
603         fd[0] = data->fd[0];
604         fd[1] = data->fd[1];
605         return 0;
606 }
607
608 static int disconnect_git(struct transport *transport)
609 {
610         struct git_transport_data *data = transport->data;
611         if (data->conn) {
612                 if (data->got_remote_heads)
613                         packet_flush(data->fd[1]);
614                 close(data->fd[0]);
615                 close(data->fd[1]);
616                 finish_connect(data->conn);
617         }
618
619         free(data);
620         return 0;
621 }
622
623 static struct transport_vtable taken_over_vtable = {
624         NULL,
625         get_refs_via_connect,
626         fetch_refs_via_pack,
627         git_transport_push,
628         NULL,
629         disconnect_git
630 };
631
632 void transport_take_over(struct transport *transport,
633                          struct child_process *child)
634 {
635         struct git_transport_data *data;
636
637         if (!transport->smart_options)
638                 die("BUG: taking over transport requires non-NULL "
639                     "smart_options field.");
640
641         data = xcalloc(1, sizeof(*data));
642         data->options = *transport->smart_options;
643         data->conn = child;
644         data->fd[0] = data->conn->out;
645         data->fd[1] = data->conn->in;
646         data->got_remote_heads = 0;
647         transport->data = data;
648
649         transport->vtable = &taken_over_vtable;
650         transport->smart_options = &(data->options);
651
652         transport->cannot_reuse = 1;
653 }
654
655 static int is_file(const char *url)
656 {
657         struct stat buf;
658         if (stat(url, &buf))
659                 return 0;
660         return S_ISREG(buf.st_mode);
661 }
662
663 static int external_specification_len(const char *url)
664 {
665         return strchr(url, ':') - url;
666 }
667
668 static const struct string_list *protocol_whitelist(void)
669 {
670         static int enabled = -1;
671         static struct string_list allowed = STRING_LIST_INIT_DUP;
672
673         if (enabled < 0) {
674                 const char *v = getenv("GIT_ALLOW_PROTOCOL");
675                 if (v) {
676                         string_list_split(&allowed, v, ':', -1);
677                         string_list_sort(&allowed);
678                         enabled = 1;
679                 } else {
680                         enabled = 0;
681                 }
682         }
683
684         return enabled ? &allowed : NULL;
685 }
686
687 enum protocol_allow_config {
688         PROTOCOL_ALLOW_NEVER = 0,
689         PROTOCOL_ALLOW_USER_ONLY,
690         PROTOCOL_ALLOW_ALWAYS
691 };
692
693 static enum protocol_allow_config parse_protocol_config(const char *key,
694                                                         const char *value)
695 {
696         if (!strcasecmp(value, "always"))
697                 return PROTOCOL_ALLOW_ALWAYS;
698         else if (!strcasecmp(value, "never"))
699                 return PROTOCOL_ALLOW_NEVER;
700         else if (!strcasecmp(value, "user"))
701                 return PROTOCOL_ALLOW_USER_ONLY;
702
703         die("unknown value for config '%s': %s", key, value);
704 }
705
706 static enum protocol_allow_config get_protocol_config(const char *type)
707 {
708         char *key = xstrfmt("protocol.%s.allow", type);
709         char *value;
710
711         /* first check the per-protocol config */
712         if (!git_config_get_string(key, &value)) {
713                 enum protocol_allow_config ret =
714                         parse_protocol_config(key, value);
715                 free(key);
716                 free(value);
717                 return ret;
718         }
719         free(key);
720
721         /* if defined, fallback to user-defined default for unknown protocols */
722         if (!git_config_get_string("protocol.allow", &value)) {
723                 enum protocol_allow_config ret =
724                         parse_protocol_config("protocol.allow", value);
725                 free(value);
726                 return ret;
727         }
728
729         /* fallback to built-in defaults */
730         /* known safe */
731         if (!strcmp(type, "http") ||
732             !strcmp(type, "https") ||
733             !strcmp(type, "git") ||
734             !strcmp(type, "ssh") ||
735             !strcmp(type, "file"))
736                 return PROTOCOL_ALLOW_ALWAYS;
737
738         /* known scary; err on the side of caution */
739         if (!strcmp(type, "ext"))
740                 return PROTOCOL_ALLOW_NEVER;
741
742         /* unknown; by default let them be used only directly by the user */
743         return PROTOCOL_ALLOW_USER_ONLY;
744 }
745
746 int is_transport_allowed(const char *type, int from_user)
747 {
748         const struct string_list *whitelist = protocol_whitelist();
749         if (whitelist)
750                 return string_list_has_string(whitelist, type);
751
752         switch (get_protocol_config(type)) {
753         case PROTOCOL_ALLOW_ALWAYS:
754                 return 1;
755         case PROTOCOL_ALLOW_NEVER:
756                 return 0;
757         case PROTOCOL_ALLOW_USER_ONLY:
758                 if (from_user < 0)
759                         from_user = git_env_bool("GIT_PROTOCOL_FROM_USER", 1);
760                 return from_user;
761         }
762
763         die("BUG: invalid protocol_allow_config type");
764 }
765
766 void transport_check_allowed(const char *type)
767 {
768         if (!is_transport_allowed(type, -1))
769                 die("transport '%s' not allowed", type);
770 }
771
772 static struct transport_vtable bundle_vtable = {
773         NULL,
774         get_refs_from_bundle,
775         fetch_refs_from_bundle,
776         NULL,
777         NULL,
778         close_bundle
779 };
780
781 static struct transport_vtable builtin_smart_vtable = {
782         NULL,
783         get_refs_via_connect,
784         fetch_refs_via_pack,
785         git_transport_push,
786         connect_git,
787         disconnect_git
788 };
789
790 struct transport *transport_get(struct remote *remote, const char *url)
791 {
792         const char *helper;
793         struct transport *ret = xcalloc(1, sizeof(*ret));
794
795         ret->progress = isatty(2);
796
797         if (!remote)
798                 die("No remote provided to transport_get()");
799
800         ret->got_remote_refs = 0;
801         ret->remote = remote;
802         helper = remote->foreign_vcs;
803
804         if (!url && remote->url)
805                 url = remote->url[0];
806         ret->url = url;
807
808         /* maybe it is a foreign URL? */
809         if (url) {
810                 const char *p = url;
811
812                 while (is_urlschemechar(p == url, *p))
813                         p++;
814                 if (starts_with(p, "::"))
815                         helper = xstrndup(url, p - url);
816         }
817
818         if (helper) {
819                 transport_helper_init(ret, helper);
820         } else if (starts_with(url, "rsync:")) {
821                 die("git-over-rsync is no longer supported");
822         } else if (url_is_local_not_ssh(url) && is_file(url) && is_bundle(url, 1)) {
823                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
824                 transport_check_allowed("file");
825                 ret->data = data;
826                 ret->vtable = &bundle_vtable;
827                 ret->smart_options = NULL;
828         } else if (!is_url(url)
829                 || starts_with(url, "file://")
830                 || starts_with(url, "git://")
831                 || starts_with(url, "ssh://")
832                 || starts_with(url, "git+ssh://") /* deprecated - do not use */
833                 || starts_with(url, "ssh+git://") /* deprecated - do not use */
834                 ) {
835                 /*
836                  * These are builtin smart transports; "allowed" transports
837                  * will be checked individually in git_connect.
838                  */
839                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
840                 ret->data = data;
841                 ret->vtable = &builtin_smart_vtable;
842                 ret->smart_options = &(data->options);
843
844                 data->conn = NULL;
845                 data->got_remote_heads = 0;
846         } else {
847                 /* Unknown protocol in URL. Pass to external handler. */
848                 int len = external_specification_len(url);
849                 char *handler = xmemdupz(url, len);
850                 transport_helper_init(ret, handler);
851         }
852
853         if (ret->smart_options) {
854                 ret->smart_options->thin = 1;
855                 ret->smart_options->uploadpack = "git-upload-pack";
856                 if (remote->uploadpack)
857                         ret->smart_options->uploadpack = remote->uploadpack;
858                 ret->smart_options->receivepack = "git-receive-pack";
859                 if (remote->receivepack)
860                         ret->smart_options->receivepack = remote->receivepack;
861         }
862
863         return ret;
864 }
865
866 int transport_set_option(struct transport *transport,
867                          const char *name, const char *value)
868 {
869         int git_reports = 1, protocol_reports = 1;
870
871         if (transport->smart_options)
872                 git_reports = set_git_option(transport->smart_options,
873                                              name, value);
874
875         if (transport->vtable->set_option)
876                 protocol_reports = transport->vtable->set_option(transport,
877                                                                  name, value);
878
879         /* If either report is 0, report 0 (success). */
880         if (!git_reports || !protocol_reports)
881                 return 0;
882         /* If either reports -1 (invalid value), report -1. */
883         if ((git_reports == -1) || (protocol_reports == -1))
884                 return -1;
885         /* Otherwise if both report unknown, report unknown. */
886         return 1;
887 }
888
889 void transport_set_verbosity(struct transport *transport, int verbosity,
890         int force_progress)
891 {
892         if (verbosity >= 1)
893                 transport->verbose = verbosity <= 3 ? verbosity : 3;
894         if (verbosity < 0)
895                 transport->verbose = -1;
896
897         /**
898          * Rules used to determine whether to report progress (processing aborts
899          * when a rule is satisfied):
900          *
901          *   . Report progress, if force_progress is 1 (ie. --progress).
902          *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
903          *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
904          *   . Report progress if isatty(2) is 1.
905          **/
906         if (force_progress >= 0)
907                 transport->progress = !!force_progress;
908         else
909                 transport->progress = verbosity >= 0 && isatty(2);
910 }
911
912 static void die_with_unpushed_submodules(struct string_list *needs_pushing)
913 {
914         int i;
915
916         fprintf(stderr, _("The following submodule paths contain changes that can\n"
917                         "not be found on any remote:\n"));
918         for (i = 0; i < needs_pushing->nr; i++)
919                 fprintf(stderr, "  %s\n", needs_pushing->items[i].string);
920         fprintf(stderr, _("\nPlease try\n\n"
921                           "     git push --recurse-submodules=on-demand\n\n"
922                           "or cd to the path and use\n\n"
923                           "     git push\n\n"
924                           "to push them to a remote.\n\n"));
925
926         string_list_clear(needs_pushing, 0);
927
928         die(_("Aborting."));
929 }
930
931 static int run_pre_push_hook(struct transport *transport,
932                              struct ref *remote_refs)
933 {
934         int ret = 0, x;
935         struct ref *r;
936         struct child_process proc = CHILD_PROCESS_INIT;
937         struct strbuf buf;
938         const char *argv[4];
939
940         if (!(argv[0] = find_hook("pre-push")))
941                 return 0;
942
943         argv[1] = transport->remote->name;
944         argv[2] = transport->url;
945         argv[3] = NULL;
946
947         proc.argv = argv;
948         proc.in = -1;
949
950         if (start_command(&proc)) {
951                 finish_command(&proc);
952                 return -1;
953         }
954
955         sigchain_push(SIGPIPE, SIG_IGN);
956
957         strbuf_init(&buf, 256);
958
959         for (r = remote_refs; r; r = r->next) {
960                 if (!r->peer_ref) continue;
961                 if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
962                 if (r->status == REF_STATUS_REJECT_STALE) continue;
963                 if (r->status == REF_STATUS_UPTODATE) continue;
964
965                 strbuf_reset(&buf);
966                 strbuf_addf( &buf, "%s %s %s %s\n",
967                          r->peer_ref->name, oid_to_hex(&r->new_oid),
968                          r->name, oid_to_hex(&r->old_oid));
969
970                 if (write_in_full(proc.in, buf.buf, buf.len) < 0) {
971                         /* We do not mind if a hook does not read all refs. */
972                         if (errno != EPIPE)
973                                 ret = -1;
974                         break;
975                 }
976         }
977
978         strbuf_release(&buf);
979
980         x = close(proc.in);
981         if (!ret)
982                 ret = x;
983
984         sigchain_pop(SIGPIPE);
985
986         x = finish_command(&proc);
987         if (!ret)
988                 ret = x;
989
990         return ret;
991 }
992
993 int transport_push(struct transport *transport,
994                    int refspec_nr, const char **refspec, int flags,
995                    unsigned int *reject_reasons)
996 {
997         *reject_reasons = 0;
998         transport_verify_remote_names(refspec_nr, refspec);
999
1000         if (transport->vtable->push_refs) {
1001                 struct ref *remote_refs;
1002                 struct ref *local_refs = get_local_heads();
1003                 int match_flags = MATCH_REFS_NONE;
1004                 int verbose = (transport->verbose > 0);
1005                 int quiet = (transport->verbose < 0);
1006                 int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
1007                 int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
1008                 int push_ret, ret, err;
1009
1010                 if (check_push_refs(local_refs, refspec_nr, refspec) < 0)
1011                         return -1;
1012
1013                 remote_refs = transport->vtable->get_refs_list(transport, 1);
1014
1015                 if (flags & TRANSPORT_PUSH_ALL)
1016                         match_flags |= MATCH_REFS_ALL;
1017                 if (flags & TRANSPORT_PUSH_MIRROR)
1018                         match_flags |= MATCH_REFS_MIRROR;
1019                 if (flags & TRANSPORT_PUSH_PRUNE)
1020                         match_flags |= MATCH_REFS_PRUNE;
1021                 if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
1022                         match_flags |= MATCH_REFS_FOLLOW_TAGS;
1023
1024                 if (match_push_refs(local_refs, &remote_refs,
1025                                     refspec_nr, refspec, match_flags)) {
1026                         return -1;
1027                 }
1028
1029                 if (transport->smart_options &&
1030                     transport->smart_options->cas &&
1031                     !is_empty_cas(transport->smart_options->cas))
1032                         apply_push_cas(transport->smart_options->cas,
1033                                        transport->remote, remote_refs);
1034
1035                 set_ref_status_for_push(remote_refs,
1036                         flags & TRANSPORT_PUSH_MIRROR,
1037                         flags & TRANSPORT_PUSH_FORCE);
1038
1039                 if (!(flags & TRANSPORT_PUSH_NO_HOOK))
1040                         if (run_pre_push_hook(transport, remote_refs))
1041                                 return -1;
1042
1043                 if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1044                               TRANSPORT_RECURSE_SUBMODULES_ONLY)) &&
1045                     !is_bare_repository()) {
1046                         struct ref *ref = remote_refs;
1047                         struct oid_array commits = OID_ARRAY_INIT;
1048
1049                         for (; ref; ref = ref->next)
1050                                 if (!is_null_oid(&ref->new_oid))
1051                                         oid_array_append(&commits,
1052                                                           &ref->new_oid);
1053
1054                         if (!push_unpushed_submodules(&commits,
1055                                                       transport->remote,
1056                                                       refspec, refspec_nr,
1057                                                       transport->push_options,
1058                                                       pretend)) {
1059                                 oid_array_clear(&commits);
1060                                 die("Failed to push all needed submodules!");
1061                         }
1062                         oid_array_clear(&commits);
1063                 }
1064
1065                 if (((flags & TRANSPORT_RECURSE_SUBMODULES_CHECK) ||
1066                      ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1067                                 TRANSPORT_RECURSE_SUBMODULES_ONLY)) &&
1068                       !pretend)) && !is_bare_repository()) {
1069                         struct ref *ref = remote_refs;
1070                         struct string_list needs_pushing = STRING_LIST_INIT_DUP;
1071                         struct oid_array commits = OID_ARRAY_INIT;
1072
1073                         for (; ref; ref = ref->next)
1074                                 if (!is_null_oid(&ref->new_oid))
1075                                         oid_array_append(&commits,
1076                                                           &ref->new_oid);
1077
1078                         if (find_unpushed_submodules(&commits, transport->remote->name,
1079                                                 &needs_pushing)) {
1080                                 oid_array_clear(&commits);
1081                                 die_with_unpushed_submodules(&needs_pushing);
1082                         }
1083                         string_list_clear(&needs_pushing, 0);
1084                         oid_array_clear(&commits);
1085                 }
1086
1087                 if (!(flags & TRANSPORT_RECURSE_SUBMODULES_ONLY))
1088                         push_ret = transport->vtable->push_refs(transport, remote_refs, flags);
1089                 else
1090                         push_ret = 0;
1091                 err = push_had_errors(remote_refs);
1092                 ret = push_ret | err;
1093
1094                 if (!quiet || err)
1095                         transport_print_push_status(transport->url, remote_refs,
1096                                         verbose | porcelain, porcelain,
1097                                         reject_reasons);
1098
1099                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1100                         set_upstreams(transport, remote_refs, pretend);
1101
1102                 if (!(flags & (TRANSPORT_PUSH_DRY_RUN |
1103                                TRANSPORT_RECURSE_SUBMODULES_ONLY))) {
1104                         struct ref *ref;
1105                         for (ref = remote_refs; ref; ref = ref->next)
1106                                 transport_update_tracking_ref(transport->remote, ref, verbose);
1107                 }
1108
1109                 if (porcelain && !push_ret)
1110                         puts("Done");
1111                 else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
1112                         fprintf(stderr, "Everything up-to-date\n");
1113
1114                 return ret;
1115         }
1116         return 1;
1117 }
1118
1119 const struct ref *transport_get_remote_refs(struct transport *transport)
1120 {
1121         if (!transport->got_remote_refs) {
1122                 transport->remote_refs = transport->vtable->get_refs_list(transport, 0);
1123                 transport->got_remote_refs = 1;
1124         }
1125
1126         return transport->remote_refs;
1127 }
1128
1129 int transport_fetch_refs(struct transport *transport, struct ref *refs)
1130 {
1131         int rc;
1132         int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1133         struct ref **heads = NULL;
1134         struct ref *rm;
1135
1136         for (rm = refs; rm; rm = rm->next) {
1137                 nr_refs++;
1138                 if (rm->peer_ref &&
1139                     !is_null_oid(&rm->old_oid) &&
1140                     !oidcmp(&rm->peer_ref->old_oid, &rm->old_oid))
1141                         continue;
1142                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1143                 heads[nr_heads++] = rm;
1144         }
1145
1146         if (!nr_heads) {
1147                 /*
1148                  * When deepening of a shallow repository is requested,
1149                  * then local and remote refs are likely to still be equal.
1150                  * Just feed them all to the fetch method in that case.
1151                  * This condition shouldn't be met in a non-deepening fetch
1152                  * (see builtin/fetch.c:quickfetch()).
1153                  */
1154                 ALLOC_ARRAY(heads, nr_refs);
1155                 for (rm = refs; rm; rm = rm->next)
1156                         heads[nr_heads++] = rm;
1157         }
1158
1159         rc = transport->vtable->fetch(transport, nr_heads, heads);
1160
1161         free(heads);
1162         return rc;
1163 }
1164
1165 void transport_unlock_pack(struct transport *transport)
1166 {
1167         if (transport->pack_lockfile) {
1168                 unlink_or_warn(transport->pack_lockfile);
1169                 FREE_AND_NULL(transport->pack_lockfile);
1170         }
1171 }
1172
1173 int transport_connect(struct transport *transport, const char *name,
1174                       const char *exec, int fd[2])
1175 {
1176         if (transport->vtable->connect)
1177                 return transport->vtable->connect(transport, name, exec, fd);
1178         else
1179                 die("Operation not supported by protocol");
1180 }
1181
1182 int transport_disconnect(struct transport *transport)
1183 {
1184         int ret = 0;
1185         if (transport->vtable->disconnect)
1186                 ret = transport->vtable->disconnect(transport);
1187         free(transport);
1188         return ret;
1189 }
1190
1191 /*
1192  * Strip username (and password) from a URL and return
1193  * it in a newly allocated string.
1194  */
1195 char *transport_anonymize_url(const char *url)
1196 {
1197         char *scheme_prefix, *anon_part;
1198         size_t anon_len, prefix_len = 0;
1199
1200         anon_part = strchr(url, '@');
1201         if (url_is_local_not_ssh(url) || !anon_part)
1202                 goto literal_copy;
1203
1204         anon_len = strlen(++anon_part);
1205         scheme_prefix = strstr(url, "://");
1206         if (!scheme_prefix) {
1207                 if (!strchr(anon_part, ':'))
1208                         /* cannot be "me@there:/path/name" */
1209                         goto literal_copy;
1210         } else {
1211                 const char *cp;
1212                 /* make sure scheme is reasonable */
1213                 for (cp = url; cp < scheme_prefix; cp++) {
1214                         switch (*cp) {
1215                                 /* RFC 1738 2.1 */
1216                         case '+': case '.': case '-':
1217                                 break; /* ok */
1218                         default:
1219                                 if (isalnum(*cp))
1220                                         break;
1221                                 /* it isn't */
1222                                 goto literal_copy;
1223                         }
1224                 }
1225                 /* @ past the first slash does not count */
1226                 cp = strchr(scheme_prefix + 3, '/');
1227                 if (cp && cp < anon_part)
1228                         goto literal_copy;
1229                 prefix_len = scheme_prefix - url + 3;
1230         }
1231         return xstrfmt("%.*s%.*s", (int)prefix_len, url,
1232                        (int)anon_len, anon_part);
1233 literal_copy:
1234         return xstrdup(url);
1235 }
1236
1237 static void read_alternate_refs(const char *path,
1238                                 alternate_ref_fn *cb,
1239                                 void *data)
1240 {
1241         struct child_process cmd = CHILD_PROCESS_INIT;
1242         struct strbuf line = STRBUF_INIT;
1243         FILE *fh;
1244
1245         cmd.git_cmd = 1;
1246         argv_array_pushf(&cmd.args, "--git-dir=%s", path);
1247         argv_array_push(&cmd.args, "for-each-ref");
1248         argv_array_push(&cmd.args, "--format=%(objectname) %(refname)");
1249         cmd.env = local_repo_env;
1250         cmd.out = -1;
1251
1252         if (start_command(&cmd))
1253                 return;
1254
1255         fh = xfdopen(cmd.out, "r");
1256         while (strbuf_getline_lf(&line, fh) != EOF) {
1257                 struct object_id oid;
1258
1259                 if (get_oid_hex(line.buf, &oid) ||
1260                     line.buf[GIT_SHA1_HEXSZ] != ' ') {
1261                         warning("invalid line while parsing alternate refs: %s",
1262                                 line.buf);
1263                         break;
1264                 }
1265
1266                 cb(line.buf + GIT_SHA1_HEXSZ + 1, &oid, data);
1267         }
1268
1269         fclose(fh);
1270         finish_command(&cmd);
1271 }
1272
1273 struct alternate_refs_data {
1274         alternate_ref_fn *fn;
1275         void *data;
1276 };
1277
1278 static int refs_from_alternate_cb(struct alternate_object_database *e,
1279                                   void *data)
1280 {
1281         struct strbuf path = STRBUF_INIT;
1282         size_t base_len;
1283         struct alternate_refs_data *cb = data;
1284
1285         if (!strbuf_realpath(&path, e->path, 0))
1286                 goto out;
1287         if (!strbuf_strip_suffix(&path, "/objects"))
1288                 goto out;
1289         base_len = path.len;
1290
1291         /* Is this a git repository with refs? */
1292         strbuf_addstr(&path, "/refs");
1293         if (!is_directory(path.buf))
1294                 goto out;
1295         strbuf_setlen(&path, base_len);
1296
1297         read_alternate_refs(path.buf, cb->fn, cb->data);
1298
1299 out:
1300         strbuf_release(&path);
1301         return 0;
1302 }
1303
1304 void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1305 {
1306         struct alternate_refs_data cb;
1307         cb.fn = fn;
1308         cb.data = data;
1309         foreach_alt_odb(refs_from_alternate_cb, &cb);
1310 }