Merge branch 'mm/gc-safety-doc'
[git] / transport.c
1 #include "cache.h"
2 #include "transport.h"
3 #include "run-command.h"
4 #include "pkt-line.h"
5 #include "fetch-pack.h"
6 #include "remote.h"
7 #include "connect.h"
8 #include "send-pack.h"
9 #include "walker.h"
10 #include "bundle.h"
11 #include "dir.h"
12 #include "refs.h"
13 #include "branch.h"
14 #include "url.h"
15 #include "submodule.h"
16 #include "string-list.h"
17 #include "sha1-array.h"
18 #include "sigchain.h"
19
20 static void set_upstreams(struct transport *transport, struct ref *refs,
21         int pretend)
22 {
23         struct ref *ref;
24         for (ref = refs; ref; ref = ref->next) {
25                 const char *localname;
26                 const char *tmp;
27                 const char *remotename;
28                 unsigned char sha[20];
29                 int flag = 0;
30                 /*
31                  * Check suitability for tracking. Must be successful /
32                  * already up-to-date ref create/modify (not delete).
33                  */
34                 if (ref->status != REF_STATUS_OK &&
35                         ref->status != REF_STATUS_UPTODATE)
36                         continue;
37                 if (!ref->peer_ref)
38                         continue;
39                 if (is_null_oid(&ref->new_oid))
40                         continue;
41
42                 /* Follow symbolic refs (mainly for HEAD). */
43                 localname = ref->peer_ref->name;
44                 remotename = ref->name;
45                 tmp = resolve_ref_unsafe(localname, RESOLVE_REF_READING,
46                                          sha, &flag);
47                 if (tmp && flag & REF_ISSYMREF &&
48                         starts_with(tmp, "refs/heads/"))
49                         localname = tmp;
50
51                 /* Both source and destination must be local branches. */
52                 if (!localname || !starts_with(localname, "refs/heads/"))
53                         continue;
54                 if (!remotename || !starts_with(remotename, "refs/heads/"))
55                         continue;
56
57                 if (!pretend)
58                         install_branch_config(BRANCH_CONFIG_VERBOSE,
59                                 localname + 11, transport->remote->name,
60                                 remotename);
61                 else
62                         printf(_("Would set upstream of '%s' to '%s' of '%s'\n"),
63                                 localname + 11, remotename + 11,
64                                 transport->remote->name);
65         }
66 }
67
68 struct bundle_transport_data {
69         int fd;
70         struct bundle_header header;
71 };
72
73 static struct ref *get_refs_from_bundle(struct transport *transport, int for_push)
74 {
75         struct bundle_transport_data *data = transport->data;
76         struct ref *result = NULL;
77         int i;
78
79         if (for_push)
80                 return NULL;
81
82         if (data->fd > 0)
83                 close(data->fd);
84         data->fd = read_bundle_header(transport->url, &data->header);
85         if (data->fd < 0)
86                 die ("Could not read bundle '%s'.", transport->url);
87         for (i = 0; i < data->header.references.nr; i++) {
88                 struct ref_list_entry *e = data->header.references.list + i;
89                 struct ref *ref = alloc_ref(e->name);
90                 hashcpy(ref->old_oid.hash, e->sha1);
91                 ref->next = result;
92                 result = ref;
93         }
94         return result;
95 }
96
97 static int fetch_refs_from_bundle(struct transport *transport,
98                                int nr_heads, struct ref **to_fetch)
99 {
100         struct bundle_transport_data *data = transport->data;
101         return unbundle(&data->header, data->fd,
102                         transport->progress ? BUNDLE_VERBOSE : 0);
103 }
104
105 static int close_bundle(struct transport *transport)
106 {
107         struct bundle_transport_data *data = transport->data;
108         if (data->fd > 0)
109                 close(data->fd);
110         free(data);
111         return 0;
112 }
113
114 struct git_transport_data {
115         struct git_transport_options options;
116         struct child_process *conn;
117         int fd[2];
118         unsigned got_remote_heads : 1;
119         struct sha1_array extra_have;
120         struct sha1_array shallow;
121 };
122
123 static int set_git_option(struct git_transport_options *opts,
124                           const char *name, const char *value)
125 {
126         if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
127                 opts->uploadpack = value;
128                 return 0;
129         } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
130                 opts->receivepack = value;
131                 return 0;
132         } else if (!strcmp(name, TRANS_OPT_THIN)) {
133                 opts->thin = !!value;
134                 return 0;
135         } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
136                 opts->followtags = !!value;
137                 return 0;
138         } else if (!strcmp(name, TRANS_OPT_KEEP)) {
139                 opts->keep = !!value;
140                 return 0;
141         } else if (!strcmp(name, TRANS_OPT_UPDATE_SHALLOW)) {
142                 opts->update_shallow = !!value;
143                 return 0;
144         } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
145                 if (!value)
146                         opts->depth = 0;
147                 else {
148                         char *end;
149                         opts->depth = strtol(value, &end, 0);
150                         if (*end)
151                                 die(_("transport: invalid depth option '%s'"), value);
152                 }
153                 return 0;
154         } else if (!strcmp(name, TRANS_OPT_DEEPEN_SINCE)) {
155                 opts->deepen_since = value;
156                 return 0;
157         } else if (!strcmp(name, TRANS_OPT_DEEPEN_NOT)) {
158                 opts->deepen_not = (const struct string_list *)value;
159                 return 0;
160         } else if (!strcmp(name, TRANS_OPT_DEEPEN_RELATIVE)) {
161                 opts->deepen_relative = !!value;
162                 return 0;
163         }
164         return 1;
165 }
166
167 static int connect_setup(struct transport *transport, int for_push)
168 {
169         struct git_transport_data *data = transport->data;
170         int flags = transport->verbose > 0 ? CONNECT_VERBOSE : 0;
171
172         if (data->conn)
173                 return 0;
174
175         switch (transport->family) {
176         case TRANSPORT_FAMILY_ALL: break;
177         case TRANSPORT_FAMILY_IPV4: flags |= CONNECT_IPV4; break;
178         case TRANSPORT_FAMILY_IPV6: flags |= CONNECT_IPV6; break;
179         }
180
181         data->conn = git_connect(data->fd, transport->url,
182                                  for_push ? data->options.receivepack :
183                                  data->options.uploadpack,
184                                  flags);
185
186         return 0;
187 }
188
189 static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
190 {
191         struct git_transport_data *data = transport->data;
192         struct ref *refs;
193
194         connect_setup(transport, for_push);
195         get_remote_heads(data->fd[0], NULL, 0, &refs,
196                          for_push ? REF_NORMAL : 0,
197                          &data->extra_have,
198                          &data->shallow);
199         data->got_remote_heads = 1;
200
201         return refs;
202 }
203
204 static int fetch_refs_via_pack(struct transport *transport,
205                                int nr_heads, struct ref **to_fetch)
206 {
207         struct git_transport_data *data = transport->data;
208         struct ref *refs;
209         char *dest = xstrdup(transport->url);
210         struct fetch_pack_args args;
211         struct ref *refs_tmp = NULL;
212
213         memset(&args, 0, sizeof(args));
214         args.uploadpack = data->options.uploadpack;
215         args.keep_pack = data->options.keep;
216         args.lock_pack = 1;
217         args.use_thin_pack = data->options.thin;
218         args.include_tag = data->options.followtags;
219         args.verbose = (transport->verbose > 1);
220         args.quiet = (transport->verbose < 0);
221         args.no_progress = !transport->progress;
222         args.depth = data->options.depth;
223         args.deepen_since = data->options.deepen_since;
224         args.deepen_not = data->options.deepen_not;
225         args.deepen_relative = data->options.deepen_relative;
226         args.check_self_contained_and_connected =
227                 data->options.check_self_contained_and_connected;
228         args.cloning = transport->cloning;
229         args.update_shallow = data->options.update_shallow;
230
231         if (!data->got_remote_heads) {
232                 connect_setup(transport, 0);
233                 get_remote_heads(data->fd[0], NULL, 0, &refs_tmp, 0,
234                                  NULL, &data->shallow);
235                 data->got_remote_heads = 1;
236         }
237
238         refs = fetch_pack(&args, data->fd, data->conn,
239                           refs_tmp ? refs_tmp : transport->remote_refs,
240                           dest, to_fetch, nr_heads, &data->shallow,
241                           &transport->pack_lockfile);
242         close(data->fd[0]);
243         close(data->fd[1]);
244         if (finish_connect(data->conn)) {
245                 free_refs(refs);
246                 refs = NULL;
247         }
248         data->conn = NULL;
249         data->got_remote_heads = 0;
250         data->options.self_contained_and_connected =
251                 args.self_contained_and_connected;
252
253         free_refs(refs_tmp);
254         free_refs(refs);
255         free(dest);
256         return (refs ? 0 : -1);
257 }
258
259 static int push_had_errors(struct ref *ref)
260 {
261         for (; ref; ref = ref->next) {
262                 switch (ref->status) {
263                 case REF_STATUS_NONE:
264                 case REF_STATUS_UPTODATE:
265                 case REF_STATUS_OK:
266                         break;
267                 default:
268                         return 1;
269                 }
270         }
271         return 0;
272 }
273
274 int transport_refs_pushed(struct ref *ref)
275 {
276         for (; ref; ref = ref->next) {
277                 switch(ref->status) {
278                 case REF_STATUS_NONE:
279                 case REF_STATUS_UPTODATE:
280                         break;
281                 default:
282                         return 1;
283                 }
284         }
285         return 0;
286 }
287
288 void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
289 {
290         struct refspec rs;
291
292         if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
293                 return;
294
295         rs.src = ref->name;
296         rs.dst = NULL;
297
298         if (!remote_find_tracking(remote, &rs)) {
299                 if (verbose)
300                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
301                 if (ref->deletion) {
302                         delete_ref(rs.dst, NULL, 0);
303                 } else
304                         update_ref("update by push", rs.dst,
305                                         ref->new_oid.hash, NULL, 0, 0);
306                 free(rs.dst);
307         }
308 }
309
310 static void print_ref_status(char flag, const char *summary,
311                              struct ref *to, struct ref *from, const char *msg,
312                              int porcelain, int summary_width)
313 {
314         if (porcelain) {
315                 if (from)
316                         fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
317                 else
318                         fprintf(stdout, "%c\t:%s\t", flag, to->name);
319                 if (msg)
320                         fprintf(stdout, "%s (%s)\n", summary, msg);
321                 else
322                         fprintf(stdout, "%s\n", summary);
323         } else {
324                 fprintf(stderr, " %c %-*s ", flag, summary_width, summary);
325                 if (from)
326                         fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
327                 else
328                         fputs(prettify_refname(to->name), stderr);
329                 if (msg) {
330                         fputs(" (", stderr);
331                         fputs(msg, stderr);
332                         fputc(')', stderr);
333                 }
334                 fputc('\n', stderr);
335         }
336 }
337
338 static void print_ok_ref_status(struct ref *ref, int porcelain, int summary_width)
339 {
340         if (ref->deletion)
341                 print_ref_status('-', "[deleted]", ref, NULL, NULL,
342                                  porcelain, summary_width);
343         else if (is_null_oid(&ref->old_oid))
344                 print_ref_status('*',
345                         (starts_with(ref->name, "refs/tags/") ? "[new tag]" :
346                         "[new branch]"),
347                         ref, ref->peer_ref, NULL, porcelain, summary_width);
348         else {
349                 struct strbuf quickref = STRBUF_INIT;
350                 char type;
351                 const char *msg;
352
353                 strbuf_add_unique_abbrev(&quickref, ref->old_oid.hash,
354                                          DEFAULT_ABBREV);
355                 if (ref->forced_update) {
356                         strbuf_addstr(&quickref, "...");
357                         type = '+';
358                         msg = "forced update";
359                 } else {
360                         strbuf_addstr(&quickref, "..");
361                         type = ' ';
362                         msg = NULL;
363                 }
364                 strbuf_add_unique_abbrev(&quickref, ref->new_oid.hash,
365                                          DEFAULT_ABBREV);
366
367                 print_ref_status(type, quickref.buf, ref, ref->peer_ref, msg,
368                                  porcelain, summary_width);
369                 strbuf_release(&quickref);
370         }
371 }
372
373 static int print_one_push_status(struct ref *ref, const char *dest, int count,
374                                  int porcelain, int summary_width)
375 {
376         if (!count) {
377                 char *url = transport_anonymize_url(dest);
378                 fprintf(porcelain ? stdout : stderr, "To %s\n", url);
379                 free(url);
380         }
381
382         switch(ref->status) {
383         case REF_STATUS_NONE:
384                 print_ref_status('X', "[no match]", ref, NULL, NULL,
385                                  porcelain, summary_width);
386                 break;
387         case REF_STATUS_REJECT_NODELETE:
388                 print_ref_status('!', "[rejected]", ref, NULL,
389                                  "remote does not support deleting refs",
390                                  porcelain, summary_width);
391                 break;
392         case REF_STATUS_UPTODATE:
393                 print_ref_status('=', "[up to date]", ref,
394                                  ref->peer_ref, NULL, porcelain, summary_width);
395                 break;
396         case REF_STATUS_REJECT_NONFASTFORWARD:
397                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
398                                  "non-fast-forward", porcelain, summary_width);
399                 break;
400         case REF_STATUS_REJECT_ALREADY_EXISTS:
401                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
402                                  "already exists", porcelain, summary_width);
403                 break;
404         case REF_STATUS_REJECT_FETCH_FIRST:
405                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
406                                  "fetch first", porcelain, summary_width);
407                 break;
408         case REF_STATUS_REJECT_NEEDS_FORCE:
409                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
410                                  "needs force", porcelain, summary_width);
411                 break;
412         case REF_STATUS_REJECT_STALE:
413                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
414                                  "stale info", porcelain, summary_width);
415                 break;
416         case REF_STATUS_REJECT_SHALLOW:
417                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
418                                  "new shallow roots not allowed",
419                                  porcelain, summary_width);
420                 break;
421         case REF_STATUS_REMOTE_REJECT:
422                 print_ref_status('!', "[remote rejected]", ref,
423                                  ref->deletion ? NULL : ref->peer_ref,
424                                  ref->remote_status, porcelain, summary_width);
425                 break;
426         case REF_STATUS_EXPECTING_REPORT:
427                 print_ref_status('!', "[remote failure]", ref,
428                                  ref->deletion ? NULL : ref->peer_ref,
429                                  "remote failed to report status",
430                                  porcelain, summary_width);
431                 break;
432         case REF_STATUS_ATOMIC_PUSH_FAILED:
433                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
434                                  "atomic push failed", porcelain, summary_width);
435                 break;
436         case REF_STATUS_OK:
437                 print_ok_ref_status(ref, porcelain, summary_width);
438                 break;
439         }
440
441         return 1;
442 }
443
444 static int measure_abbrev(const struct object_id *oid, int sofar)
445 {
446         char hex[GIT_SHA1_HEXSZ + 1];
447         int w = find_unique_abbrev_r(hex, oid->hash, DEFAULT_ABBREV);
448
449         return (w < sofar) ? sofar : w;
450 }
451
452 int transport_summary_width(const struct ref *refs)
453 {
454         int maxw = -1;
455
456         for (; refs; refs = refs->next) {
457                 maxw = measure_abbrev(&refs->old_oid, maxw);
458                 maxw = measure_abbrev(&refs->new_oid, maxw);
459         }
460         if (maxw < 0)
461                 maxw = FALLBACK_DEFAULT_ABBREV;
462         return (2 * maxw + 3);
463 }
464
465 void transport_print_push_status(const char *dest, struct ref *refs,
466                                   int verbose, int porcelain, unsigned int *reject_reasons)
467 {
468         struct ref *ref;
469         int n = 0;
470         unsigned char head_sha1[20];
471         char *head;
472         int summary_width = transport_summary_width(refs);
473
474         head = resolve_refdup("HEAD", RESOLVE_REF_READING, head_sha1, NULL);
475
476         if (verbose) {
477                 for (ref = refs; ref; ref = ref->next)
478                         if (ref->status == REF_STATUS_UPTODATE)
479                                 n += print_one_push_status(ref, dest, n,
480                                                            porcelain, summary_width);
481         }
482
483         for (ref = refs; ref; ref = ref->next)
484                 if (ref->status == REF_STATUS_OK)
485                         n += print_one_push_status(ref, dest, n,
486                                                    porcelain, summary_width);
487
488         *reject_reasons = 0;
489         for (ref = refs; ref; ref = ref->next) {
490                 if (ref->status != REF_STATUS_NONE &&
491                     ref->status != REF_STATUS_UPTODATE &&
492                     ref->status != REF_STATUS_OK)
493                         n += print_one_push_status(ref, dest, n,
494                                                    porcelain, summary_width);
495                 if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
496                         if (head != NULL && !strcmp(head, ref->name))
497                                 *reject_reasons |= REJECT_NON_FF_HEAD;
498                         else
499                                 *reject_reasons |= REJECT_NON_FF_OTHER;
500                 } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
501                         *reject_reasons |= REJECT_ALREADY_EXISTS;
502                 } else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
503                         *reject_reasons |= REJECT_FETCH_FIRST;
504                 } else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
505                         *reject_reasons |= REJECT_NEEDS_FORCE;
506                 }
507         }
508         free(head);
509 }
510
511 void transport_verify_remote_names(int nr_heads, const char **heads)
512 {
513         int i;
514
515         for (i = 0; i < nr_heads; i++) {
516                 const char *local = heads[i];
517                 const char *remote = strrchr(heads[i], ':');
518
519                 if (*local == '+')
520                         local++;
521
522                 /* A matching refspec is okay.  */
523                 if (remote == local && remote[1] == '\0')
524                         continue;
525
526                 remote = remote ? (remote + 1) : local;
527                 if (check_refname_format(remote,
528                                 REFNAME_ALLOW_ONELEVEL|REFNAME_REFSPEC_PATTERN))
529                         die("remote part of refspec is not a valid name in %s",
530                                 heads[i]);
531         }
532 }
533
534 static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
535 {
536         struct git_transport_data *data = transport->data;
537         struct send_pack_args args;
538         int ret;
539
540         if (!data->got_remote_heads) {
541                 struct ref *tmp_refs;
542                 connect_setup(transport, 1);
543
544                 get_remote_heads(data->fd[0], NULL, 0, &tmp_refs, REF_NORMAL,
545                                  NULL, &data->shallow);
546                 data->got_remote_heads = 1;
547         }
548
549         memset(&args, 0, sizeof(args));
550         args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
551         args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
552         args.use_thin_pack = data->options.thin;
553         args.verbose = (transport->verbose > 0);
554         args.quiet = (transport->verbose < 0);
555         args.progress = transport->progress;
556         args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
557         args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
558         args.atomic = !!(flags & TRANSPORT_PUSH_ATOMIC);
559         args.push_options = transport->push_options;
560         args.url = transport->url;
561
562         if (flags & TRANSPORT_PUSH_CERT_ALWAYS)
563                 args.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
564         else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED)
565                 args.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
566         else
567                 args.push_cert = SEND_PACK_PUSH_CERT_NEVER;
568
569         ret = send_pack(&args, data->fd, data->conn, remote_refs,
570                         &data->extra_have);
571
572         close(data->fd[1]);
573         close(data->fd[0]);
574         ret |= finish_connect(data->conn);
575         data->conn = NULL;
576         data->got_remote_heads = 0;
577
578         return ret;
579 }
580
581 static int connect_git(struct transport *transport, const char *name,
582                        const char *executable, int fd[2])
583 {
584         struct git_transport_data *data = transport->data;
585         data->conn = git_connect(data->fd, transport->url,
586                                  executable, 0);
587         fd[0] = data->fd[0];
588         fd[1] = data->fd[1];
589         return 0;
590 }
591
592 static int disconnect_git(struct transport *transport)
593 {
594         struct git_transport_data *data = transport->data;
595         if (data->conn) {
596                 if (data->got_remote_heads)
597                         packet_flush(data->fd[1]);
598                 close(data->fd[0]);
599                 close(data->fd[1]);
600                 finish_connect(data->conn);
601         }
602
603         free(data);
604         return 0;
605 }
606
607 void transport_take_over(struct transport *transport,
608                          struct child_process *child)
609 {
610         struct git_transport_data *data;
611
612         if (!transport->smart_options)
613                 die("BUG: taking over transport requires non-NULL "
614                     "smart_options field.");
615
616         data = xcalloc(1, sizeof(*data));
617         data->options = *transport->smart_options;
618         data->conn = child;
619         data->fd[0] = data->conn->out;
620         data->fd[1] = data->conn->in;
621         data->got_remote_heads = 0;
622         transport->data = data;
623
624         transport->set_option = NULL;
625         transport->get_refs_list = get_refs_via_connect;
626         transport->fetch = fetch_refs_via_pack;
627         transport->push = NULL;
628         transport->push_refs = git_transport_push;
629         transport->disconnect = disconnect_git;
630         transport->smart_options = &(data->options);
631
632         transport->cannot_reuse = 1;
633 }
634
635 static int is_file(const char *url)
636 {
637         struct stat buf;
638         if (stat(url, &buf))
639                 return 0;
640         return S_ISREG(buf.st_mode);
641 }
642
643 static int external_specification_len(const char *url)
644 {
645         return strchr(url, ':') - url;
646 }
647
648 static const struct string_list *protocol_whitelist(void)
649 {
650         static int enabled = -1;
651         static struct string_list allowed = STRING_LIST_INIT_DUP;
652
653         if (enabled < 0) {
654                 const char *v = getenv("GIT_ALLOW_PROTOCOL");
655                 if (v) {
656                         string_list_split(&allowed, v, ':', -1);
657                         string_list_sort(&allowed);
658                         enabled = 1;
659                 } else {
660                         enabled = 0;
661                 }
662         }
663
664         return enabled ? &allowed : NULL;
665 }
666
667 enum protocol_allow_config {
668         PROTOCOL_ALLOW_NEVER = 0,
669         PROTOCOL_ALLOW_USER_ONLY,
670         PROTOCOL_ALLOW_ALWAYS
671 };
672
673 static enum protocol_allow_config parse_protocol_config(const char *key,
674                                                         const char *value)
675 {
676         if (!strcasecmp(value, "always"))
677                 return PROTOCOL_ALLOW_ALWAYS;
678         else if (!strcasecmp(value, "never"))
679                 return PROTOCOL_ALLOW_NEVER;
680         else if (!strcasecmp(value, "user"))
681                 return PROTOCOL_ALLOW_USER_ONLY;
682
683         die("unknown value for config '%s': %s", key, value);
684 }
685
686 static enum protocol_allow_config get_protocol_config(const char *type)
687 {
688         char *key = xstrfmt("protocol.%s.allow", type);
689         char *value;
690
691         /* first check the per-protocol config */
692         if (!git_config_get_string(key, &value)) {
693                 enum protocol_allow_config ret =
694                         parse_protocol_config(key, value);
695                 free(key);
696                 free(value);
697                 return ret;
698         }
699         free(key);
700
701         /* if defined, fallback to user-defined default for unknown protocols */
702         if (!git_config_get_string("protocol.allow", &value)) {
703                 enum protocol_allow_config ret =
704                         parse_protocol_config("protocol.allow", value);
705                 free(value);
706                 return ret;
707         }
708
709         /* fallback to built-in defaults */
710         /* known safe */
711         if (!strcmp(type, "http") ||
712             !strcmp(type, "https") ||
713             !strcmp(type, "git") ||
714             !strcmp(type, "ssh") ||
715             !strcmp(type, "file"))
716                 return PROTOCOL_ALLOW_ALWAYS;
717
718         /* known scary; err on the side of caution */
719         if (!strcmp(type, "ext"))
720                 return PROTOCOL_ALLOW_NEVER;
721
722         /* unknown; by default let them be used only directly by the user */
723         return PROTOCOL_ALLOW_USER_ONLY;
724 }
725
726 int is_transport_allowed(const char *type, int from_user)
727 {
728         const struct string_list *whitelist = protocol_whitelist();
729         if (whitelist)
730                 return string_list_has_string(whitelist, type);
731
732         switch (get_protocol_config(type)) {
733         case PROTOCOL_ALLOW_ALWAYS:
734                 return 1;
735         case PROTOCOL_ALLOW_NEVER:
736                 return 0;
737         case PROTOCOL_ALLOW_USER_ONLY:
738                 if (from_user < 0)
739                         from_user = git_env_bool("GIT_PROTOCOL_FROM_USER", 1);
740                 return from_user;
741         }
742
743         die("BUG: invalid protocol_allow_config type");
744 }
745
746 void transport_check_allowed(const char *type)
747 {
748         if (!is_transport_allowed(type, -1))
749                 die("transport '%s' not allowed", type);
750 }
751
752 struct transport *transport_get(struct remote *remote, const char *url)
753 {
754         const char *helper;
755         struct transport *ret = xcalloc(1, sizeof(*ret));
756
757         ret->progress = isatty(2);
758
759         if (!remote)
760                 die("No remote provided to transport_get()");
761
762         ret->got_remote_refs = 0;
763         ret->remote = remote;
764         helper = remote->foreign_vcs;
765
766         if (!url && remote->url)
767                 url = remote->url[0];
768         ret->url = url;
769
770         /* maybe it is a foreign URL? */
771         if (url) {
772                 const char *p = url;
773
774                 while (is_urlschemechar(p == url, *p))
775                         p++;
776                 if (starts_with(p, "::"))
777                         helper = xstrndup(url, p - url);
778         }
779
780         if (helper) {
781                 transport_helper_init(ret, helper);
782         } else if (starts_with(url, "rsync:")) {
783                 die("git-over-rsync is no longer supported");
784         } else if (url_is_local_not_ssh(url) && is_file(url) && is_bundle(url, 1)) {
785                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
786                 transport_check_allowed("file");
787                 ret->data = data;
788                 ret->get_refs_list = get_refs_from_bundle;
789                 ret->fetch = fetch_refs_from_bundle;
790                 ret->disconnect = close_bundle;
791                 ret->smart_options = NULL;
792         } else if (!is_url(url)
793                 || starts_with(url, "file://")
794                 || starts_with(url, "git://")
795                 || starts_with(url, "ssh://")
796                 || starts_with(url, "git+ssh://") /* deprecated - do not use */
797                 || starts_with(url, "ssh+git://") /* deprecated - do not use */
798                 ) {
799                 /*
800                  * These are builtin smart transports; "allowed" transports
801                  * will be checked individually in git_connect.
802                  */
803                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
804                 ret->data = data;
805                 ret->set_option = NULL;
806                 ret->get_refs_list = get_refs_via_connect;
807                 ret->fetch = fetch_refs_via_pack;
808                 ret->push_refs = git_transport_push;
809                 ret->connect = connect_git;
810                 ret->disconnect = disconnect_git;
811                 ret->smart_options = &(data->options);
812
813                 data->conn = NULL;
814                 data->got_remote_heads = 0;
815         } else {
816                 /* Unknown protocol in URL. Pass to external handler. */
817                 int len = external_specification_len(url);
818                 char *handler = xmemdupz(url, len);
819                 transport_helper_init(ret, handler);
820         }
821
822         if (ret->smart_options) {
823                 ret->smart_options->thin = 1;
824                 ret->smart_options->uploadpack = "git-upload-pack";
825                 if (remote->uploadpack)
826                         ret->smart_options->uploadpack = remote->uploadpack;
827                 ret->smart_options->receivepack = "git-receive-pack";
828                 if (remote->receivepack)
829                         ret->smart_options->receivepack = remote->receivepack;
830         }
831
832         return ret;
833 }
834
835 int transport_set_option(struct transport *transport,
836                          const char *name, const char *value)
837 {
838         int git_reports = 1, protocol_reports = 1;
839
840         if (transport->smart_options)
841                 git_reports = set_git_option(transport->smart_options,
842                                              name, value);
843
844         if (transport->set_option)
845                 protocol_reports = transport->set_option(transport, name,
846                                                         value);
847
848         /* If either report is 0, report 0 (success). */
849         if (!git_reports || !protocol_reports)
850                 return 0;
851         /* If either reports -1 (invalid value), report -1. */
852         if ((git_reports == -1) || (protocol_reports == -1))
853                 return -1;
854         /* Otherwise if both report unknown, report unknown. */
855         return 1;
856 }
857
858 void transport_set_verbosity(struct transport *transport, int verbosity,
859         int force_progress)
860 {
861         if (verbosity >= 1)
862                 transport->verbose = verbosity <= 3 ? verbosity : 3;
863         if (verbosity < 0)
864                 transport->verbose = -1;
865
866         /**
867          * Rules used to determine whether to report progress (processing aborts
868          * when a rule is satisfied):
869          *
870          *   . Report progress, if force_progress is 1 (ie. --progress).
871          *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
872          *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
873          *   . Report progress if isatty(2) is 1.
874          **/
875         if (force_progress >= 0)
876                 transport->progress = !!force_progress;
877         else
878                 transport->progress = verbosity >= 0 && isatty(2);
879 }
880
881 static void die_with_unpushed_submodules(struct string_list *needs_pushing)
882 {
883         int i;
884
885         fprintf(stderr, _("The following submodule paths contain changes that can\n"
886                         "not be found on any remote:\n"));
887         for (i = 0; i < needs_pushing->nr; i++)
888                 fprintf(stderr, "  %s\n", needs_pushing->items[i].string);
889         fprintf(stderr, _("\nPlease try\n\n"
890                           "     git push --recurse-submodules=on-demand\n\n"
891                           "or cd to the path and use\n\n"
892                           "     git push\n\n"
893                           "to push them to a remote.\n\n"));
894
895         string_list_clear(needs_pushing, 0);
896
897         die(_("Aborting."));
898 }
899
900 static int run_pre_push_hook(struct transport *transport,
901                              struct ref *remote_refs)
902 {
903         int ret = 0, x;
904         struct ref *r;
905         struct child_process proc = CHILD_PROCESS_INIT;
906         struct strbuf buf;
907         const char *argv[4];
908
909         if (!(argv[0] = find_hook("pre-push")))
910                 return 0;
911
912         argv[1] = transport->remote->name;
913         argv[2] = transport->url;
914         argv[3] = NULL;
915
916         proc.argv = argv;
917         proc.in = -1;
918
919         if (start_command(&proc)) {
920                 finish_command(&proc);
921                 return -1;
922         }
923
924         sigchain_push(SIGPIPE, SIG_IGN);
925
926         strbuf_init(&buf, 256);
927
928         for (r = remote_refs; r; r = r->next) {
929                 if (!r->peer_ref) continue;
930                 if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
931                 if (r->status == REF_STATUS_REJECT_STALE) continue;
932                 if (r->status == REF_STATUS_UPTODATE) continue;
933
934                 strbuf_reset(&buf);
935                 strbuf_addf( &buf, "%s %s %s %s\n",
936                          r->peer_ref->name, oid_to_hex(&r->new_oid),
937                          r->name, oid_to_hex(&r->old_oid));
938
939                 if (write_in_full(proc.in, buf.buf, buf.len) < 0) {
940                         /* We do not mind if a hook does not read all refs. */
941                         if (errno != EPIPE)
942                                 ret = -1;
943                         break;
944                 }
945         }
946
947         strbuf_release(&buf);
948
949         x = close(proc.in);
950         if (!ret)
951                 ret = x;
952
953         sigchain_pop(SIGPIPE);
954
955         x = finish_command(&proc);
956         if (!ret)
957                 ret = x;
958
959         return ret;
960 }
961
962 int transport_push(struct transport *transport,
963                    int refspec_nr, const char **refspec, int flags,
964                    unsigned int *reject_reasons)
965 {
966         *reject_reasons = 0;
967         transport_verify_remote_names(refspec_nr, refspec);
968
969         if (transport->push) {
970                 /* Maybe FIXME. But no important transport uses this case. */
971                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
972                         die("This transport does not support using --set-upstream");
973
974                 return transport->push(transport, refspec_nr, refspec, flags);
975         } else if (transport->push_refs) {
976                 struct ref *remote_refs;
977                 struct ref *local_refs = get_local_heads();
978                 int match_flags = MATCH_REFS_NONE;
979                 int verbose = (transport->verbose > 0);
980                 int quiet = (transport->verbose < 0);
981                 int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
982                 int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
983                 int push_ret, ret, err;
984
985                 if (check_push_refs(local_refs, refspec_nr, refspec) < 0)
986                         return -1;
987
988                 remote_refs = transport->get_refs_list(transport, 1);
989
990                 if (flags & TRANSPORT_PUSH_ALL)
991                         match_flags |= MATCH_REFS_ALL;
992                 if (flags & TRANSPORT_PUSH_MIRROR)
993                         match_flags |= MATCH_REFS_MIRROR;
994                 if (flags & TRANSPORT_PUSH_PRUNE)
995                         match_flags |= MATCH_REFS_PRUNE;
996                 if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
997                         match_flags |= MATCH_REFS_FOLLOW_TAGS;
998
999                 if (match_push_refs(local_refs, &remote_refs,
1000                                     refspec_nr, refspec, match_flags)) {
1001                         return -1;
1002                 }
1003
1004                 if (transport->smart_options &&
1005                     transport->smart_options->cas &&
1006                     !is_empty_cas(transport->smart_options->cas))
1007                         apply_push_cas(transport->smart_options->cas,
1008                                        transport->remote, remote_refs);
1009
1010                 set_ref_status_for_push(remote_refs,
1011                         flags & TRANSPORT_PUSH_MIRROR,
1012                         flags & TRANSPORT_PUSH_FORCE);
1013
1014                 if (!(flags & TRANSPORT_PUSH_NO_HOOK))
1015                         if (run_pre_push_hook(transport, remote_refs))
1016                                 return -1;
1017
1018                 if ((flags & TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND) && !is_bare_repository()) {
1019                         struct ref *ref = remote_refs;
1020                         struct sha1_array commits = SHA1_ARRAY_INIT;
1021
1022                         for (; ref; ref = ref->next)
1023                                 if (!is_null_oid(&ref->new_oid))
1024                                         sha1_array_append(&commits, ref->new_oid.hash);
1025
1026                         if (!push_unpushed_submodules(&commits,
1027                                                       transport->remote->name,
1028                                                       pretend)) {
1029                                 sha1_array_clear(&commits);
1030                                 die("Failed to push all needed submodules!");
1031                         }
1032                         sha1_array_clear(&commits);
1033                 }
1034
1035                 if (((flags & TRANSPORT_RECURSE_SUBMODULES_CHECK) ||
1036                      ((flags & TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND) &&
1037                       !pretend)) && !is_bare_repository()) {
1038                         struct ref *ref = remote_refs;
1039                         struct string_list needs_pushing = STRING_LIST_INIT_DUP;
1040                         struct sha1_array commits = SHA1_ARRAY_INIT;
1041
1042                         for (; ref; ref = ref->next)
1043                                 if (!is_null_oid(&ref->new_oid))
1044                                         sha1_array_append(&commits, ref->new_oid.hash);
1045
1046                         if (find_unpushed_submodules(&commits, transport->remote->name,
1047                                                 &needs_pushing)) {
1048                                 sha1_array_clear(&commits);
1049                                 die_with_unpushed_submodules(&needs_pushing);
1050                         }
1051                         string_list_clear(&needs_pushing, 0);
1052                         sha1_array_clear(&commits);
1053                 }
1054
1055                 push_ret = transport->push_refs(transport, remote_refs, flags);
1056                 err = push_had_errors(remote_refs);
1057                 ret = push_ret | err;
1058
1059                 if (!quiet || err)
1060                         transport_print_push_status(transport->url, remote_refs,
1061                                         verbose | porcelain, porcelain,
1062                                         reject_reasons);
1063
1064                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1065                         set_upstreams(transport, remote_refs, pretend);
1066
1067                 if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
1068                         struct ref *ref;
1069                         for (ref = remote_refs; ref; ref = ref->next)
1070                                 transport_update_tracking_ref(transport->remote, ref, verbose);
1071                 }
1072
1073                 if (porcelain && !push_ret)
1074                         puts("Done");
1075                 else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
1076                         fprintf(stderr, "Everything up-to-date\n");
1077
1078                 return ret;
1079         }
1080         return 1;
1081 }
1082
1083 const struct ref *transport_get_remote_refs(struct transport *transport)
1084 {
1085         if (!transport->got_remote_refs) {
1086                 transport->remote_refs = transport->get_refs_list(transport, 0);
1087                 transport->got_remote_refs = 1;
1088         }
1089
1090         return transport->remote_refs;
1091 }
1092
1093 int transport_fetch_refs(struct transport *transport, struct ref *refs)
1094 {
1095         int rc;
1096         int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1097         struct ref **heads = NULL;
1098         struct ref *rm;
1099
1100         for (rm = refs; rm; rm = rm->next) {
1101                 nr_refs++;
1102                 if (rm->peer_ref &&
1103                     !is_null_oid(&rm->old_oid) &&
1104                     !oidcmp(&rm->peer_ref->old_oid, &rm->old_oid))
1105                         continue;
1106                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1107                 heads[nr_heads++] = rm;
1108         }
1109
1110         if (!nr_heads) {
1111                 /*
1112                  * When deepening of a shallow repository is requested,
1113                  * then local and remote refs are likely to still be equal.
1114                  * Just feed them all to the fetch method in that case.
1115                  * This condition shouldn't be met in a non-deepening fetch
1116                  * (see builtin/fetch.c:quickfetch()).
1117                  */
1118                 ALLOC_ARRAY(heads, nr_refs);
1119                 for (rm = refs; rm; rm = rm->next)
1120                         heads[nr_heads++] = rm;
1121         }
1122
1123         rc = transport->fetch(transport, nr_heads, heads);
1124
1125         free(heads);
1126         return rc;
1127 }
1128
1129 void transport_unlock_pack(struct transport *transport)
1130 {
1131         if (transport->pack_lockfile) {
1132                 unlink_or_warn(transport->pack_lockfile);
1133                 free(transport->pack_lockfile);
1134                 transport->pack_lockfile = NULL;
1135         }
1136 }
1137
1138 int transport_connect(struct transport *transport, const char *name,
1139                       const char *exec, int fd[2])
1140 {
1141         if (transport->connect)
1142                 return transport->connect(transport, name, exec, fd);
1143         else
1144                 die("Operation not supported by protocol");
1145 }
1146
1147 int transport_disconnect(struct transport *transport)
1148 {
1149         int ret = 0;
1150         if (transport->disconnect)
1151                 ret = transport->disconnect(transport);
1152         free(transport);
1153         return ret;
1154 }
1155
1156 /*
1157  * Strip username (and password) from a URL and return
1158  * it in a newly allocated string.
1159  */
1160 char *transport_anonymize_url(const char *url)
1161 {
1162         char *scheme_prefix, *anon_part;
1163         size_t anon_len, prefix_len = 0;
1164
1165         anon_part = strchr(url, '@');
1166         if (url_is_local_not_ssh(url) || !anon_part)
1167                 goto literal_copy;
1168
1169         anon_len = strlen(++anon_part);
1170         scheme_prefix = strstr(url, "://");
1171         if (!scheme_prefix) {
1172                 if (!strchr(anon_part, ':'))
1173                         /* cannot be "me@there:/path/name" */
1174                         goto literal_copy;
1175         } else {
1176                 const char *cp;
1177                 /* make sure scheme is reasonable */
1178                 for (cp = url; cp < scheme_prefix; cp++) {
1179                         switch (*cp) {
1180                                 /* RFC 1738 2.1 */
1181                         case '+': case '.': case '-':
1182                                 break; /* ok */
1183                         default:
1184                                 if (isalnum(*cp))
1185                                         break;
1186                                 /* it isn't */
1187                                 goto literal_copy;
1188                         }
1189                 }
1190                 /* @ past the first slash does not count */
1191                 cp = strchr(scheme_prefix + 3, '/');
1192                 if (cp && cp < anon_part)
1193                         goto literal_copy;
1194                 prefix_len = scheme_prefix - url + 3;
1195         }
1196         return xstrfmt("%.*s%.*s", (int)prefix_len, url,
1197                        (int)anon_len, anon_part);
1198 literal_copy:
1199         return xstrdup(url);
1200 }
1201
1202 struct alternate_refs_data {
1203         alternate_ref_fn *fn;
1204         void *data;
1205 };
1206
1207 static int refs_from_alternate_cb(struct alternate_object_database *e,
1208                                   void *data)
1209 {
1210         char *other;
1211         size_t len;
1212         struct remote *remote;
1213         struct transport *transport;
1214         const struct ref *extra;
1215         struct alternate_refs_data *cb = data;
1216
1217         other = xstrdup(real_path(e->path));
1218         len = strlen(other);
1219
1220         while (other[len-1] == '/')
1221                 other[--len] = '\0';
1222         if (len < 8 || memcmp(other + len - 8, "/objects", 8))
1223                 goto out;
1224         /* Is this a git repository with refs? */
1225         memcpy(other + len - 8, "/refs", 6);
1226         if (!is_directory(other))
1227                 goto out;
1228         other[len - 8] = '\0';
1229         remote = remote_get(other);
1230         transport = transport_get(remote, other);
1231         for (extra = transport_get_remote_refs(transport);
1232              extra;
1233              extra = extra->next)
1234                 cb->fn(extra, cb->data);
1235         transport_disconnect(transport);
1236 out:
1237         free(other);
1238         return 0;
1239 }
1240
1241 void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1242 {
1243         struct alternate_refs_data cb;
1244         cb.fn = fn;
1245         cb.data = data;
1246         foreach_alt_odb(refs_from_alternate_cb, &cb);
1247 }