Merge branch 'jk/stash-disable-renames-internally'
[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 int is_transport_allowed(const char *type)
668 {
669         const struct string_list *allowed = protocol_whitelist();
670         return !allowed || string_list_has_string(allowed, type);
671 }
672
673 void transport_check_allowed(const char *type)
674 {
675         if (!is_transport_allowed(type))
676                 die("transport '%s' not allowed", type);
677 }
678
679 int transport_restrict_protocols(void)
680 {
681         return !!protocol_whitelist();
682 }
683
684 struct transport *transport_get(struct remote *remote, const char *url)
685 {
686         const char *helper;
687         struct transport *ret = xcalloc(1, sizeof(*ret));
688
689         ret->progress = isatty(2);
690
691         if (!remote)
692                 die("No remote provided to transport_get()");
693
694         ret->got_remote_refs = 0;
695         ret->remote = remote;
696         helper = remote->foreign_vcs;
697
698         if (!url && remote->url)
699                 url = remote->url[0];
700         ret->url = url;
701
702         /* maybe it is a foreign URL? */
703         if (url) {
704                 const char *p = url;
705
706                 while (is_urlschemechar(p == url, *p))
707                         p++;
708                 if (starts_with(p, "::"))
709                         helper = xstrndup(url, p - url);
710         }
711
712         if (helper) {
713                 transport_helper_init(ret, helper);
714         } else if (starts_with(url, "rsync:")) {
715                 die("git-over-rsync is no longer supported");
716         } else if (url_is_local_not_ssh(url) && is_file(url) && is_bundle(url, 1)) {
717                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
718                 transport_check_allowed("file");
719                 ret->data = data;
720                 ret->get_refs_list = get_refs_from_bundle;
721                 ret->fetch = fetch_refs_from_bundle;
722                 ret->disconnect = close_bundle;
723                 ret->smart_options = NULL;
724         } else if (!is_url(url)
725                 || starts_with(url, "file://")
726                 || starts_with(url, "git://")
727                 || starts_with(url, "ssh://")
728                 || starts_with(url, "git+ssh://") /* deprecated - do not use */
729                 || starts_with(url, "ssh+git://") /* deprecated - do not use */
730                 ) {
731                 /*
732                  * These are builtin smart transports; "allowed" transports
733                  * will be checked individually in git_connect.
734                  */
735                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
736                 ret->data = data;
737                 ret->set_option = NULL;
738                 ret->get_refs_list = get_refs_via_connect;
739                 ret->fetch = fetch_refs_via_pack;
740                 ret->push_refs = git_transport_push;
741                 ret->connect = connect_git;
742                 ret->disconnect = disconnect_git;
743                 ret->smart_options = &(data->options);
744
745                 data->conn = NULL;
746                 data->got_remote_heads = 0;
747         } else {
748                 /* Unknown protocol in URL. Pass to external handler. */
749                 int len = external_specification_len(url);
750                 char *handler = xmemdupz(url, len);
751                 transport_helper_init(ret, handler);
752         }
753
754         if (ret->smart_options) {
755                 ret->smart_options->thin = 1;
756                 ret->smart_options->uploadpack = "git-upload-pack";
757                 if (remote->uploadpack)
758                         ret->smart_options->uploadpack = remote->uploadpack;
759                 ret->smart_options->receivepack = "git-receive-pack";
760                 if (remote->receivepack)
761                         ret->smart_options->receivepack = remote->receivepack;
762         }
763
764         return ret;
765 }
766
767 int transport_set_option(struct transport *transport,
768                          const char *name, const char *value)
769 {
770         int git_reports = 1, protocol_reports = 1;
771
772         if (transport->smart_options)
773                 git_reports = set_git_option(transport->smart_options,
774                                              name, value);
775
776         if (transport->set_option)
777                 protocol_reports = transport->set_option(transport, name,
778                                                         value);
779
780         /* If either report is 0, report 0 (success). */
781         if (!git_reports || !protocol_reports)
782                 return 0;
783         /* If either reports -1 (invalid value), report -1. */
784         if ((git_reports == -1) || (protocol_reports == -1))
785                 return -1;
786         /* Otherwise if both report unknown, report unknown. */
787         return 1;
788 }
789
790 void transport_set_verbosity(struct transport *transport, int verbosity,
791         int force_progress)
792 {
793         if (verbosity >= 1)
794                 transport->verbose = verbosity <= 3 ? verbosity : 3;
795         if (verbosity < 0)
796                 transport->verbose = -1;
797
798         /**
799          * Rules used to determine whether to report progress (processing aborts
800          * when a rule is satisfied):
801          *
802          *   . Report progress, if force_progress is 1 (ie. --progress).
803          *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
804          *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
805          *   . Report progress if isatty(2) is 1.
806          **/
807         if (force_progress >= 0)
808                 transport->progress = !!force_progress;
809         else
810                 transport->progress = verbosity >= 0 && isatty(2);
811 }
812
813 static void die_with_unpushed_submodules(struct string_list *needs_pushing)
814 {
815         int i;
816
817         fprintf(stderr, _("The following submodule paths contain changes that can\n"
818                         "not be found on any remote:\n"));
819         for (i = 0; i < needs_pushing->nr; i++)
820                 fprintf(stderr, "  %s\n", needs_pushing->items[i].string);
821         fprintf(stderr, _("\nPlease try\n\n"
822                           "     git push --recurse-submodules=on-demand\n\n"
823                           "or cd to the path and use\n\n"
824                           "     git push\n\n"
825                           "to push them to a remote.\n\n"));
826
827         string_list_clear(needs_pushing, 0);
828
829         die(_("Aborting."));
830 }
831
832 static int run_pre_push_hook(struct transport *transport,
833                              struct ref *remote_refs)
834 {
835         int ret = 0, x;
836         struct ref *r;
837         struct child_process proc = CHILD_PROCESS_INIT;
838         struct strbuf buf;
839         const char *argv[4];
840
841         if (!(argv[0] = find_hook("pre-push")))
842                 return 0;
843
844         argv[1] = transport->remote->name;
845         argv[2] = transport->url;
846         argv[3] = NULL;
847
848         proc.argv = argv;
849         proc.in = -1;
850
851         if (start_command(&proc)) {
852                 finish_command(&proc);
853                 return -1;
854         }
855
856         sigchain_push(SIGPIPE, SIG_IGN);
857
858         strbuf_init(&buf, 256);
859
860         for (r = remote_refs; r; r = r->next) {
861                 if (!r->peer_ref) continue;
862                 if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
863                 if (r->status == REF_STATUS_REJECT_STALE) continue;
864                 if (r->status == REF_STATUS_UPTODATE) continue;
865
866                 strbuf_reset(&buf);
867                 strbuf_addf( &buf, "%s %s %s %s\n",
868                          r->peer_ref->name, oid_to_hex(&r->new_oid),
869                          r->name, oid_to_hex(&r->old_oid));
870
871                 if (write_in_full(proc.in, buf.buf, buf.len) < 0) {
872                         /* We do not mind if a hook does not read all refs. */
873                         if (errno != EPIPE)
874                                 ret = -1;
875                         break;
876                 }
877         }
878
879         strbuf_release(&buf);
880
881         x = close(proc.in);
882         if (!ret)
883                 ret = x;
884
885         sigchain_pop(SIGPIPE);
886
887         x = finish_command(&proc);
888         if (!ret)
889                 ret = x;
890
891         return ret;
892 }
893
894 int transport_push(struct transport *transport,
895                    int refspec_nr, const char **refspec, int flags,
896                    unsigned int *reject_reasons)
897 {
898         *reject_reasons = 0;
899         transport_verify_remote_names(refspec_nr, refspec);
900
901         if (transport->push) {
902                 /* Maybe FIXME. But no important transport uses this case. */
903                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
904                         die("This transport does not support using --set-upstream");
905
906                 return transport->push(transport, refspec_nr, refspec, flags);
907         } else if (transport->push_refs) {
908                 struct ref *remote_refs;
909                 struct ref *local_refs = get_local_heads();
910                 int match_flags = MATCH_REFS_NONE;
911                 int verbose = (transport->verbose > 0);
912                 int quiet = (transport->verbose < 0);
913                 int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
914                 int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
915                 int push_ret, ret, err;
916
917                 if (check_push_refs(local_refs, refspec_nr, refspec) < 0)
918                         return -1;
919
920                 remote_refs = transport->get_refs_list(transport, 1);
921
922                 if (flags & TRANSPORT_PUSH_ALL)
923                         match_flags |= MATCH_REFS_ALL;
924                 if (flags & TRANSPORT_PUSH_MIRROR)
925                         match_flags |= MATCH_REFS_MIRROR;
926                 if (flags & TRANSPORT_PUSH_PRUNE)
927                         match_flags |= MATCH_REFS_PRUNE;
928                 if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
929                         match_flags |= MATCH_REFS_FOLLOW_TAGS;
930
931                 if (match_push_refs(local_refs, &remote_refs,
932                                     refspec_nr, refspec, match_flags)) {
933                         return -1;
934                 }
935
936                 if (transport->smart_options &&
937                     transport->smart_options->cas &&
938                     !is_empty_cas(transport->smart_options->cas))
939                         apply_push_cas(transport->smart_options->cas,
940                                        transport->remote, remote_refs);
941
942                 set_ref_status_for_push(remote_refs,
943                         flags & TRANSPORT_PUSH_MIRROR,
944                         flags & TRANSPORT_PUSH_FORCE);
945
946                 if (!(flags & TRANSPORT_PUSH_NO_HOOK))
947                         if (run_pre_push_hook(transport, remote_refs))
948                                 return -1;
949
950                 if ((flags & TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND) && !is_bare_repository()) {
951                         struct ref *ref = remote_refs;
952                         struct sha1_array commits = SHA1_ARRAY_INIT;
953
954                         for (; ref; ref = ref->next)
955                                 if (!is_null_oid(&ref->new_oid))
956                                         sha1_array_append(&commits, ref->new_oid.hash);
957
958                         if (!push_unpushed_submodules(&commits,
959                                                       transport->remote->name,
960                                                       pretend)) {
961                                 sha1_array_clear(&commits);
962                                 die("Failed to push all needed submodules!");
963                         }
964                         sha1_array_clear(&commits);
965                 }
966
967                 if (((flags & TRANSPORT_RECURSE_SUBMODULES_CHECK) ||
968                      ((flags & TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND) &&
969                       !pretend)) && !is_bare_repository()) {
970                         struct ref *ref = remote_refs;
971                         struct string_list needs_pushing = STRING_LIST_INIT_DUP;
972                         struct sha1_array commits = SHA1_ARRAY_INIT;
973
974                         for (; ref; ref = ref->next)
975                                 if (!is_null_oid(&ref->new_oid))
976                                         sha1_array_append(&commits, ref->new_oid.hash);
977
978                         if (find_unpushed_submodules(&commits, transport->remote->name,
979                                                 &needs_pushing)) {
980                                 sha1_array_clear(&commits);
981                                 die_with_unpushed_submodules(&needs_pushing);
982                         }
983                         string_list_clear(&needs_pushing, 0);
984                         sha1_array_clear(&commits);
985                 }
986
987                 push_ret = transport->push_refs(transport, remote_refs, flags);
988                 err = push_had_errors(remote_refs);
989                 ret = push_ret | err;
990
991                 if (!quiet || err)
992                         transport_print_push_status(transport->url, remote_refs,
993                                         verbose | porcelain, porcelain,
994                                         reject_reasons);
995
996                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
997                         set_upstreams(transport, remote_refs, pretend);
998
999                 if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
1000                         struct ref *ref;
1001                         for (ref = remote_refs; ref; ref = ref->next)
1002                                 transport_update_tracking_ref(transport->remote, ref, verbose);
1003                 }
1004
1005                 if (porcelain && !push_ret)
1006                         puts("Done");
1007                 else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
1008                         fprintf(stderr, "Everything up-to-date\n");
1009
1010                 return ret;
1011         }
1012         return 1;
1013 }
1014
1015 const struct ref *transport_get_remote_refs(struct transport *transport)
1016 {
1017         if (!transport->got_remote_refs) {
1018                 transport->remote_refs = transport->get_refs_list(transport, 0);
1019                 transport->got_remote_refs = 1;
1020         }
1021
1022         return transport->remote_refs;
1023 }
1024
1025 int transport_fetch_refs(struct transport *transport, struct ref *refs)
1026 {
1027         int rc;
1028         int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1029         struct ref **heads = NULL;
1030         struct ref *rm;
1031
1032         for (rm = refs; rm; rm = rm->next) {
1033                 nr_refs++;
1034                 if (rm->peer_ref &&
1035                     !is_null_oid(&rm->old_oid) &&
1036                     !oidcmp(&rm->peer_ref->old_oid, &rm->old_oid))
1037                         continue;
1038                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1039                 heads[nr_heads++] = rm;
1040         }
1041
1042         if (!nr_heads) {
1043                 /*
1044                  * When deepening of a shallow repository is requested,
1045                  * then local and remote refs are likely to still be equal.
1046                  * Just feed them all to the fetch method in that case.
1047                  * This condition shouldn't be met in a non-deepening fetch
1048                  * (see builtin/fetch.c:quickfetch()).
1049                  */
1050                 ALLOC_ARRAY(heads, nr_refs);
1051                 for (rm = refs; rm; rm = rm->next)
1052                         heads[nr_heads++] = rm;
1053         }
1054
1055         rc = transport->fetch(transport, nr_heads, heads);
1056
1057         free(heads);
1058         return rc;
1059 }
1060
1061 void transport_unlock_pack(struct transport *transport)
1062 {
1063         if (transport->pack_lockfile) {
1064                 unlink_or_warn(transport->pack_lockfile);
1065                 free(transport->pack_lockfile);
1066                 transport->pack_lockfile = NULL;
1067         }
1068 }
1069
1070 int transport_connect(struct transport *transport, const char *name,
1071                       const char *exec, int fd[2])
1072 {
1073         if (transport->connect)
1074                 return transport->connect(transport, name, exec, fd);
1075         else
1076                 die("Operation not supported by protocol");
1077 }
1078
1079 int transport_disconnect(struct transport *transport)
1080 {
1081         int ret = 0;
1082         if (transport->disconnect)
1083                 ret = transport->disconnect(transport);
1084         free(transport);
1085         return ret;
1086 }
1087
1088 /*
1089  * Strip username (and password) from a URL and return
1090  * it in a newly allocated string.
1091  */
1092 char *transport_anonymize_url(const char *url)
1093 {
1094         char *scheme_prefix, *anon_part;
1095         size_t anon_len, prefix_len = 0;
1096
1097         anon_part = strchr(url, '@');
1098         if (url_is_local_not_ssh(url) || !anon_part)
1099                 goto literal_copy;
1100
1101         anon_len = strlen(++anon_part);
1102         scheme_prefix = strstr(url, "://");
1103         if (!scheme_prefix) {
1104                 if (!strchr(anon_part, ':'))
1105                         /* cannot be "me@there:/path/name" */
1106                         goto literal_copy;
1107         } else {
1108                 const char *cp;
1109                 /* make sure scheme is reasonable */
1110                 for (cp = url; cp < scheme_prefix; cp++) {
1111                         switch (*cp) {
1112                                 /* RFC 1738 2.1 */
1113                         case '+': case '.': case '-':
1114                                 break; /* ok */
1115                         default:
1116                                 if (isalnum(*cp))
1117                                         break;
1118                                 /* it isn't */
1119                                 goto literal_copy;
1120                         }
1121                 }
1122                 /* @ past the first slash does not count */
1123                 cp = strchr(scheme_prefix + 3, '/');
1124                 if (cp && cp < anon_part)
1125                         goto literal_copy;
1126                 prefix_len = scheme_prefix - url + 3;
1127         }
1128         return xstrfmt("%.*s%.*s", (int)prefix_len, url,
1129                        (int)anon_len, anon_part);
1130 literal_copy:
1131         return xstrdup(url);
1132 }
1133
1134 struct alternate_refs_data {
1135         alternate_ref_fn *fn;
1136         void *data;
1137 };
1138
1139 static int refs_from_alternate_cb(struct alternate_object_database *e,
1140                                   void *data)
1141 {
1142         char *other;
1143         size_t len;
1144         struct remote *remote;
1145         struct transport *transport;
1146         const struct ref *extra;
1147         struct alternate_refs_data *cb = data;
1148
1149         other = xstrdup(real_path(e->path));
1150         len = strlen(other);
1151
1152         while (other[len-1] == '/')
1153                 other[--len] = '\0';
1154         if (len < 8 || memcmp(other + len - 8, "/objects", 8))
1155                 goto out;
1156         /* Is this a git repository with refs? */
1157         memcpy(other + len - 8, "/refs", 6);
1158         if (!is_directory(other))
1159                 goto out;
1160         other[len - 8] = '\0';
1161         remote = remote_get(other);
1162         transport = transport_get(remote, other);
1163         for (extra = transport_get_remote_refs(transport);
1164              extra;
1165              extra = extra->next)
1166                 cb->fn(extra, cb->data);
1167         transport_disconnect(transport);
1168 out:
1169         free(other);
1170         return 0;
1171 }
1172
1173 void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1174 {
1175         struct alternate_refs_data cb;
1176         cb.fn = fn;
1177         cb.data = data;
1178         foreach_alt_odb(refs_from_alternate_cb, &cb);
1179 }