Merge branch 'nd/log-decorate-color-head-arrow'
[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         }
155         return 1;
156 }
157
158 static int connect_setup(struct transport *transport, int for_push)
159 {
160         struct git_transport_data *data = transport->data;
161         int flags = transport->verbose > 0 ? CONNECT_VERBOSE : 0;
162
163         if (data->conn)
164                 return 0;
165
166         switch (transport->family) {
167         case TRANSPORT_FAMILY_ALL: break;
168         case TRANSPORT_FAMILY_IPV4: flags |= CONNECT_IPV4; break;
169         case TRANSPORT_FAMILY_IPV6: flags |= CONNECT_IPV6; break;
170         }
171
172         data->conn = git_connect(data->fd, transport->url,
173                                  for_push ? data->options.receivepack :
174                                  data->options.uploadpack,
175                                  flags);
176
177         return 0;
178 }
179
180 static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
181 {
182         struct git_transport_data *data = transport->data;
183         struct ref *refs;
184
185         connect_setup(transport, for_push);
186         get_remote_heads(data->fd[0], NULL, 0, &refs,
187                          for_push ? REF_NORMAL : 0,
188                          &data->extra_have,
189                          &data->shallow);
190         data->got_remote_heads = 1;
191
192         return refs;
193 }
194
195 static int fetch_refs_via_pack(struct transport *transport,
196                                int nr_heads, struct ref **to_fetch)
197 {
198         struct git_transport_data *data = transport->data;
199         struct ref *refs;
200         char *dest = xstrdup(transport->url);
201         struct fetch_pack_args args;
202         struct ref *refs_tmp = NULL;
203
204         memset(&args, 0, sizeof(args));
205         args.uploadpack = data->options.uploadpack;
206         args.keep_pack = data->options.keep;
207         args.lock_pack = 1;
208         args.use_thin_pack = data->options.thin;
209         args.include_tag = data->options.followtags;
210         args.verbose = (transport->verbose > 1);
211         args.quiet = (transport->verbose < 0);
212         args.no_progress = !transport->progress;
213         args.depth = data->options.depth;
214         args.check_self_contained_and_connected =
215                 data->options.check_self_contained_and_connected;
216         args.cloning = transport->cloning;
217         args.update_shallow = data->options.update_shallow;
218
219         if (!data->got_remote_heads) {
220                 connect_setup(transport, 0);
221                 get_remote_heads(data->fd[0], NULL, 0, &refs_tmp, 0,
222                                  NULL, &data->shallow);
223                 data->got_remote_heads = 1;
224         }
225
226         refs = fetch_pack(&args, data->fd, data->conn,
227                           refs_tmp ? refs_tmp : transport->remote_refs,
228                           dest, to_fetch, nr_heads, &data->shallow,
229                           &transport->pack_lockfile);
230         close(data->fd[0]);
231         close(data->fd[1]);
232         if (finish_connect(data->conn)) {
233                 free_refs(refs);
234                 refs = NULL;
235         }
236         data->conn = NULL;
237         data->got_remote_heads = 0;
238         data->options.self_contained_and_connected =
239                 args.self_contained_and_connected;
240
241         free_refs(refs_tmp);
242         free_refs(refs);
243         free(dest);
244         return (refs ? 0 : -1);
245 }
246
247 static int push_had_errors(struct ref *ref)
248 {
249         for (; ref; ref = ref->next) {
250                 switch (ref->status) {
251                 case REF_STATUS_NONE:
252                 case REF_STATUS_UPTODATE:
253                 case REF_STATUS_OK:
254                         break;
255                 default:
256                         return 1;
257                 }
258         }
259         return 0;
260 }
261
262 int transport_refs_pushed(struct ref *ref)
263 {
264         for (; ref; ref = ref->next) {
265                 switch(ref->status) {
266                 case REF_STATUS_NONE:
267                 case REF_STATUS_UPTODATE:
268                         break;
269                 default:
270                         return 1;
271                 }
272         }
273         return 0;
274 }
275
276 void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
277 {
278         struct refspec rs;
279
280         if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
281                 return;
282
283         rs.src = ref->name;
284         rs.dst = NULL;
285
286         if (!remote_find_tracking(remote, &rs)) {
287                 if (verbose)
288                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
289                 if (ref->deletion) {
290                         delete_ref(rs.dst, NULL, 0);
291                 } else
292                         update_ref("update by push", rs.dst,
293                                         ref->new_oid.hash, NULL, 0, 0);
294                 free(rs.dst);
295         }
296 }
297
298 static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg, int porcelain)
299 {
300         if (porcelain) {
301                 if (from)
302                         fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
303                 else
304                         fprintf(stdout, "%c\t:%s\t", flag, to->name);
305                 if (msg)
306                         fprintf(stdout, "%s (%s)\n", summary, msg);
307                 else
308                         fprintf(stdout, "%s\n", summary);
309         } else {
310                 fprintf(stderr, " %c %-*s ", flag, TRANSPORT_SUMMARY_WIDTH, summary);
311                 if (from)
312                         fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
313                 else
314                         fputs(prettify_refname(to->name), stderr);
315                 if (msg) {
316                         fputs(" (", stderr);
317                         fputs(msg, stderr);
318                         fputc(')', stderr);
319                 }
320                 fputc('\n', stderr);
321         }
322 }
323
324 static const char *status_abbrev(unsigned char sha1[20])
325 {
326         return find_unique_abbrev(sha1, DEFAULT_ABBREV);
327 }
328
329 static void print_ok_ref_status(struct ref *ref, int porcelain)
330 {
331         if (ref->deletion)
332                 print_ref_status('-', "[deleted]", ref, NULL, NULL, porcelain);
333         else if (is_null_oid(&ref->old_oid))
334                 print_ref_status('*',
335                         (starts_with(ref->name, "refs/tags/") ? "[new tag]" :
336                         "[new branch]"),
337                         ref, ref->peer_ref, NULL, porcelain);
338         else {
339                 struct strbuf quickref = STRBUF_INIT;
340                 char type;
341                 const char *msg;
342
343                 strbuf_addstr(&quickref, status_abbrev(ref->old_oid.hash));
344                 if (ref->forced_update) {
345                         strbuf_addstr(&quickref, "...");
346                         type = '+';
347                         msg = "forced update";
348                 } else {
349                         strbuf_addstr(&quickref, "..");
350                         type = ' ';
351                         msg = NULL;
352                 }
353                 strbuf_addstr(&quickref, status_abbrev(ref->new_oid.hash));
354
355                 print_ref_status(type, quickref.buf, ref, ref->peer_ref, msg, porcelain);
356                 strbuf_release(&quickref);
357         }
358 }
359
360 static int print_one_push_status(struct ref *ref, const char *dest, int count, int porcelain)
361 {
362         if (!count) {
363                 char *url = transport_anonymize_url(dest);
364                 fprintf(porcelain ? stdout : stderr, "To %s\n", url);
365                 free(url);
366         }
367
368         switch(ref->status) {
369         case REF_STATUS_NONE:
370                 print_ref_status('X', "[no match]", ref, NULL, NULL, porcelain);
371                 break;
372         case REF_STATUS_REJECT_NODELETE:
373                 print_ref_status('!', "[rejected]", ref, NULL,
374                                                  "remote does not support deleting refs", porcelain);
375                 break;
376         case REF_STATUS_UPTODATE:
377                 print_ref_status('=', "[up to date]", ref,
378                                                  ref->peer_ref, NULL, porcelain);
379                 break;
380         case REF_STATUS_REJECT_NONFASTFORWARD:
381                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
382                                                  "non-fast-forward", porcelain);
383                 break;
384         case REF_STATUS_REJECT_ALREADY_EXISTS:
385                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
386                                                  "already exists", porcelain);
387                 break;
388         case REF_STATUS_REJECT_FETCH_FIRST:
389                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
390                                                  "fetch first", porcelain);
391                 break;
392         case REF_STATUS_REJECT_NEEDS_FORCE:
393                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
394                                                  "needs force", porcelain);
395                 break;
396         case REF_STATUS_REJECT_STALE:
397                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
398                                                  "stale info", porcelain);
399                 break;
400         case REF_STATUS_REJECT_SHALLOW:
401                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
402                                                  "new shallow roots not allowed", porcelain);
403                 break;
404         case REF_STATUS_REMOTE_REJECT:
405                 print_ref_status('!', "[remote rejected]", ref,
406                                                  ref->deletion ? NULL : ref->peer_ref,
407                                                  ref->remote_status, porcelain);
408                 break;
409         case REF_STATUS_EXPECTING_REPORT:
410                 print_ref_status('!', "[remote failure]", ref,
411                                                  ref->deletion ? NULL : ref->peer_ref,
412                                                  "remote failed to report status", porcelain);
413                 break;
414         case REF_STATUS_ATOMIC_PUSH_FAILED:
415                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
416                                                  "atomic push failed", porcelain);
417                 break;
418         case REF_STATUS_OK:
419                 print_ok_ref_status(ref, porcelain);
420                 break;
421         }
422
423         return 1;
424 }
425
426 void transport_print_push_status(const char *dest, struct ref *refs,
427                                   int verbose, int porcelain, unsigned int *reject_reasons)
428 {
429         struct ref *ref;
430         int n = 0;
431         unsigned char head_sha1[20];
432         char *head;
433
434         head = resolve_refdup("HEAD", RESOLVE_REF_READING, head_sha1, NULL);
435
436         if (verbose) {
437                 for (ref = refs; ref; ref = ref->next)
438                         if (ref->status == REF_STATUS_UPTODATE)
439                                 n += print_one_push_status(ref, dest, n, porcelain);
440         }
441
442         for (ref = refs; ref; ref = ref->next)
443                 if (ref->status == REF_STATUS_OK)
444                         n += print_one_push_status(ref, dest, n, porcelain);
445
446         *reject_reasons = 0;
447         for (ref = refs; ref; ref = ref->next) {
448                 if (ref->status != REF_STATUS_NONE &&
449                     ref->status != REF_STATUS_UPTODATE &&
450                     ref->status != REF_STATUS_OK)
451                         n += print_one_push_status(ref, dest, n, porcelain);
452                 if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
453                         if (head != NULL && !strcmp(head, ref->name))
454                                 *reject_reasons |= REJECT_NON_FF_HEAD;
455                         else
456                                 *reject_reasons |= REJECT_NON_FF_OTHER;
457                 } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
458                         *reject_reasons |= REJECT_ALREADY_EXISTS;
459                 } else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
460                         *reject_reasons |= REJECT_FETCH_FIRST;
461                 } else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
462                         *reject_reasons |= REJECT_NEEDS_FORCE;
463                 }
464         }
465         free(head);
466 }
467
468 void transport_verify_remote_names(int nr_heads, const char **heads)
469 {
470         int i;
471
472         for (i = 0; i < nr_heads; i++) {
473                 const char *local = heads[i];
474                 const char *remote = strrchr(heads[i], ':');
475
476                 if (*local == '+')
477                         local++;
478
479                 /* A matching refspec is okay.  */
480                 if (remote == local && remote[1] == '\0')
481                         continue;
482
483                 remote = remote ? (remote + 1) : local;
484                 if (check_refname_format(remote,
485                                 REFNAME_ALLOW_ONELEVEL|REFNAME_REFSPEC_PATTERN))
486                         die("remote part of refspec is not a valid name in %s",
487                                 heads[i]);
488         }
489 }
490
491 static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
492 {
493         struct git_transport_data *data = transport->data;
494         struct send_pack_args args;
495         int ret;
496
497         if (!data->got_remote_heads) {
498                 struct ref *tmp_refs;
499                 connect_setup(transport, 1);
500
501                 get_remote_heads(data->fd[0], NULL, 0, &tmp_refs, REF_NORMAL,
502                                  NULL, &data->shallow);
503                 data->got_remote_heads = 1;
504         }
505
506         memset(&args, 0, sizeof(args));
507         args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
508         args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
509         args.use_thin_pack = data->options.thin;
510         args.verbose = (transport->verbose > 0);
511         args.quiet = (transport->verbose < 0);
512         args.progress = transport->progress;
513         args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
514         args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
515         args.atomic = !!(flags & TRANSPORT_PUSH_ATOMIC);
516         args.push_options = transport->push_options;
517         args.url = transport->url;
518
519         if (flags & TRANSPORT_PUSH_CERT_ALWAYS)
520                 args.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
521         else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED)
522                 args.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
523         else
524                 args.push_cert = SEND_PACK_PUSH_CERT_NEVER;
525
526         ret = send_pack(&args, data->fd, data->conn, remote_refs,
527                         &data->extra_have);
528
529         close(data->fd[1]);
530         close(data->fd[0]);
531         ret |= finish_connect(data->conn);
532         data->conn = NULL;
533         data->got_remote_heads = 0;
534
535         return ret;
536 }
537
538 static int connect_git(struct transport *transport, const char *name,
539                        const char *executable, int fd[2])
540 {
541         struct git_transport_data *data = transport->data;
542         data->conn = git_connect(data->fd, transport->url,
543                                  executable, 0);
544         fd[0] = data->fd[0];
545         fd[1] = data->fd[1];
546         return 0;
547 }
548
549 static int disconnect_git(struct transport *transport)
550 {
551         struct git_transport_data *data = transport->data;
552         if (data->conn) {
553                 if (data->got_remote_heads)
554                         packet_flush(data->fd[1]);
555                 close(data->fd[0]);
556                 close(data->fd[1]);
557                 finish_connect(data->conn);
558         }
559
560         free(data);
561         return 0;
562 }
563
564 void transport_take_over(struct transport *transport,
565                          struct child_process *child)
566 {
567         struct git_transport_data *data;
568
569         if (!transport->smart_options)
570                 die("Bug detected: Taking over transport requires non-NULL "
571                     "smart_options field.");
572
573         data = xcalloc(1, sizeof(*data));
574         data->options = *transport->smart_options;
575         data->conn = child;
576         data->fd[0] = data->conn->out;
577         data->fd[1] = data->conn->in;
578         data->got_remote_heads = 0;
579         transport->data = data;
580
581         transport->set_option = NULL;
582         transport->get_refs_list = get_refs_via_connect;
583         transport->fetch = fetch_refs_via_pack;
584         transport->push = NULL;
585         transport->push_refs = git_transport_push;
586         transport->disconnect = disconnect_git;
587         transport->smart_options = &(data->options);
588
589         transport->cannot_reuse = 1;
590 }
591
592 static int is_file(const char *url)
593 {
594         struct stat buf;
595         if (stat(url, &buf))
596                 return 0;
597         return S_ISREG(buf.st_mode);
598 }
599
600 static int external_specification_len(const char *url)
601 {
602         return strchr(url, ':') - url;
603 }
604
605 static const struct string_list *protocol_whitelist(void)
606 {
607         static int enabled = -1;
608         static struct string_list allowed = STRING_LIST_INIT_DUP;
609
610         if (enabled < 0) {
611                 const char *v = getenv("GIT_ALLOW_PROTOCOL");
612                 if (v) {
613                         string_list_split(&allowed, v, ':', -1);
614                         string_list_sort(&allowed);
615                         enabled = 1;
616                 } else {
617                         enabled = 0;
618                 }
619         }
620
621         return enabled ? &allowed : NULL;
622 }
623
624 int is_transport_allowed(const char *type)
625 {
626         const struct string_list *allowed = protocol_whitelist();
627         return !allowed || string_list_has_string(allowed, type);
628 }
629
630 void transport_check_allowed(const char *type)
631 {
632         if (!is_transport_allowed(type))
633                 die("transport '%s' not allowed", type);
634 }
635
636 int transport_restrict_protocols(void)
637 {
638         return !!protocol_whitelist();
639 }
640
641 struct transport *transport_get(struct remote *remote, const char *url)
642 {
643         const char *helper;
644         struct transport *ret = xcalloc(1, sizeof(*ret));
645
646         ret->progress = isatty(2);
647
648         if (!remote)
649                 die("No remote provided to transport_get()");
650
651         ret->got_remote_refs = 0;
652         ret->remote = remote;
653         helper = remote->foreign_vcs;
654
655         if (!url && remote->url)
656                 url = remote->url[0];
657         ret->url = url;
658
659         /* maybe it is a foreign URL? */
660         if (url) {
661                 const char *p = url;
662
663                 while (is_urlschemechar(p == url, *p))
664                         p++;
665                 if (starts_with(p, "::"))
666                         helper = xstrndup(url, p - url);
667         }
668
669         if (helper) {
670                 transport_helper_init(ret, helper);
671         } else if (starts_with(url, "rsync:")) {
672                 die("git-over-rsync is no longer supported");
673         } else if (url_is_local_not_ssh(url) && is_file(url) && is_bundle(url, 1)) {
674                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
675                 transport_check_allowed("file");
676                 ret->data = data;
677                 ret->get_refs_list = get_refs_from_bundle;
678                 ret->fetch = fetch_refs_from_bundle;
679                 ret->disconnect = close_bundle;
680                 ret->smart_options = NULL;
681         } else if (!is_url(url)
682                 || starts_with(url, "file://")
683                 || starts_with(url, "git://")
684                 || starts_with(url, "ssh://")
685                 || starts_with(url, "git+ssh://") /* deprecated - do not use */
686                 || starts_with(url, "ssh+git://") /* deprecated - do not use */
687                 ) {
688                 /*
689                  * These are builtin smart transports; "allowed" transports
690                  * will be checked individually in git_connect.
691                  */
692                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
693                 ret->data = data;
694                 ret->set_option = NULL;
695                 ret->get_refs_list = get_refs_via_connect;
696                 ret->fetch = fetch_refs_via_pack;
697                 ret->push_refs = git_transport_push;
698                 ret->connect = connect_git;
699                 ret->disconnect = disconnect_git;
700                 ret->smart_options = &(data->options);
701
702                 data->conn = NULL;
703                 data->got_remote_heads = 0;
704         } else {
705                 /* Unknown protocol in URL. Pass to external handler. */
706                 int len = external_specification_len(url);
707                 char *handler = xmemdupz(url, len);
708                 transport_helper_init(ret, handler);
709         }
710
711         if (ret->smart_options) {
712                 ret->smart_options->thin = 1;
713                 ret->smart_options->uploadpack = "git-upload-pack";
714                 if (remote->uploadpack)
715                         ret->smart_options->uploadpack = remote->uploadpack;
716                 ret->smart_options->receivepack = "git-receive-pack";
717                 if (remote->receivepack)
718                         ret->smart_options->receivepack = remote->receivepack;
719         }
720
721         return ret;
722 }
723
724 int transport_set_option(struct transport *transport,
725                          const char *name, const char *value)
726 {
727         int git_reports = 1, protocol_reports = 1;
728
729         if (transport->smart_options)
730                 git_reports = set_git_option(transport->smart_options,
731                                              name, value);
732
733         if (transport->set_option)
734                 protocol_reports = transport->set_option(transport, name,
735                                                         value);
736
737         /* If either report is 0, report 0 (success). */
738         if (!git_reports || !protocol_reports)
739                 return 0;
740         /* If either reports -1 (invalid value), report -1. */
741         if ((git_reports == -1) || (protocol_reports == -1))
742                 return -1;
743         /* Otherwise if both report unknown, report unknown. */
744         return 1;
745 }
746
747 void transport_set_verbosity(struct transport *transport, int verbosity,
748         int force_progress)
749 {
750         if (verbosity >= 1)
751                 transport->verbose = verbosity <= 3 ? verbosity : 3;
752         if (verbosity < 0)
753                 transport->verbose = -1;
754
755         /**
756          * Rules used to determine whether to report progress (processing aborts
757          * when a rule is satisfied):
758          *
759          *   . Report progress, if force_progress is 1 (ie. --progress).
760          *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
761          *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
762          *   . Report progress if isatty(2) is 1.
763          **/
764         if (force_progress >= 0)
765                 transport->progress = !!force_progress;
766         else
767                 transport->progress = verbosity >= 0 && isatty(2);
768 }
769
770 static void die_with_unpushed_submodules(struct string_list *needs_pushing)
771 {
772         int i;
773
774         fprintf(stderr, _("The following submodule paths contain changes that can\n"
775                         "not be found on any remote:\n"));
776         for (i = 0; i < needs_pushing->nr; i++)
777                 printf("  %s\n", needs_pushing->items[i].string);
778         fprintf(stderr, _("\nPlease try\n\n"
779                           "     git push --recurse-submodules=on-demand\n\n"
780                           "or cd to the path and use\n\n"
781                           "     git push\n\n"
782                           "to push them to a remote.\n\n"));
783
784         string_list_clear(needs_pushing, 0);
785
786         die(_("Aborting."));
787 }
788
789 static int run_pre_push_hook(struct transport *transport,
790                              struct ref *remote_refs)
791 {
792         int ret = 0, x;
793         struct ref *r;
794         struct child_process proc = CHILD_PROCESS_INIT;
795         struct strbuf buf;
796         const char *argv[4];
797
798         if (!(argv[0] = find_hook("pre-push")))
799                 return 0;
800
801         argv[1] = transport->remote->name;
802         argv[2] = transport->url;
803         argv[3] = NULL;
804
805         proc.argv = argv;
806         proc.in = -1;
807
808         if (start_command(&proc)) {
809                 finish_command(&proc);
810                 return -1;
811         }
812
813         sigchain_push(SIGPIPE, SIG_IGN);
814
815         strbuf_init(&buf, 256);
816
817         for (r = remote_refs; r; r = r->next) {
818                 if (!r->peer_ref) continue;
819                 if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
820                 if (r->status == REF_STATUS_REJECT_STALE) continue;
821                 if (r->status == REF_STATUS_UPTODATE) continue;
822
823                 strbuf_reset(&buf);
824                 strbuf_addf( &buf, "%s %s %s %s\n",
825                          r->peer_ref->name, oid_to_hex(&r->new_oid),
826                          r->name, oid_to_hex(&r->old_oid));
827
828                 if (write_in_full(proc.in, buf.buf, buf.len) < 0) {
829                         /* We do not mind if a hook does not read all refs. */
830                         if (errno != EPIPE)
831                                 ret = -1;
832                         break;
833                 }
834         }
835
836         strbuf_release(&buf);
837
838         x = close(proc.in);
839         if (!ret)
840                 ret = x;
841
842         sigchain_pop(SIGPIPE);
843
844         x = finish_command(&proc);
845         if (!ret)
846                 ret = x;
847
848         return ret;
849 }
850
851 int transport_push(struct transport *transport,
852                    int refspec_nr, const char **refspec, int flags,
853                    unsigned int *reject_reasons)
854 {
855         *reject_reasons = 0;
856         transport_verify_remote_names(refspec_nr, refspec);
857
858         if (transport->push) {
859                 /* Maybe FIXME. But no important transport uses this case. */
860                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
861                         die("This transport does not support using --set-upstream");
862
863                 return transport->push(transport, refspec_nr, refspec, flags);
864         } else if (transport->push_refs) {
865                 struct ref *remote_refs;
866                 struct ref *local_refs = get_local_heads();
867                 int match_flags = MATCH_REFS_NONE;
868                 int verbose = (transport->verbose > 0);
869                 int quiet = (transport->verbose < 0);
870                 int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
871                 int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
872                 int push_ret, ret, err;
873
874                 if (check_push_refs(local_refs, refspec_nr, refspec) < 0)
875                         return -1;
876
877                 remote_refs = transport->get_refs_list(transport, 1);
878
879                 if (flags & TRANSPORT_PUSH_ALL)
880                         match_flags |= MATCH_REFS_ALL;
881                 if (flags & TRANSPORT_PUSH_MIRROR)
882                         match_flags |= MATCH_REFS_MIRROR;
883                 if (flags & TRANSPORT_PUSH_PRUNE)
884                         match_flags |= MATCH_REFS_PRUNE;
885                 if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
886                         match_flags |= MATCH_REFS_FOLLOW_TAGS;
887
888                 if (match_push_refs(local_refs, &remote_refs,
889                                     refspec_nr, refspec, match_flags)) {
890                         return -1;
891                 }
892
893                 if (transport->smart_options &&
894                     transport->smart_options->cas &&
895                     !is_empty_cas(transport->smart_options->cas))
896                         apply_push_cas(transport->smart_options->cas,
897                                        transport->remote, remote_refs);
898
899                 set_ref_status_for_push(remote_refs,
900                         flags & TRANSPORT_PUSH_MIRROR,
901                         flags & TRANSPORT_PUSH_FORCE);
902
903                 if (!(flags & TRANSPORT_PUSH_NO_HOOK))
904                         if (run_pre_push_hook(transport, remote_refs))
905                                 return -1;
906
907                 if ((flags & TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND) && !is_bare_repository()) {
908                         struct ref *ref = remote_refs;
909                         for (; ref; ref = ref->next)
910                                 if (!is_null_oid(&ref->new_oid) &&
911                                     !push_unpushed_submodules(ref->new_oid.hash,
912                                             transport->remote->name))
913                                     die ("Failed to push all needed submodules!");
914                 }
915
916                 if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
917                               TRANSPORT_RECURSE_SUBMODULES_CHECK)) && !is_bare_repository()) {
918                         struct ref *ref = remote_refs;
919                         struct string_list needs_pushing = STRING_LIST_INIT_DUP;
920
921                         for (; ref; ref = ref->next)
922                                 if (!is_null_oid(&ref->new_oid) &&
923                                     find_unpushed_submodules(ref->new_oid.hash,
924                                             transport->remote->name, &needs_pushing))
925                                         die_with_unpushed_submodules(&needs_pushing);
926                 }
927
928                 push_ret = transport->push_refs(transport, remote_refs, flags);
929                 err = push_had_errors(remote_refs);
930                 ret = push_ret | err;
931
932                 if (!quiet || err)
933                         transport_print_push_status(transport->url, remote_refs,
934                                         verbose | porcelain, porcelain,
935                                         reject_reasons);
936
937                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
938                         set_upstreams(transport, remote_refs, pretend);
939
940                 if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
941                         struct ref *ref;
942                         for (ref = remote_refs; ref; ref = ref->next)
943                                 transport_update_tracking_ref(transport->remote, ref, verbose);
944                 }
945
946                 if (porcelain && !push_ret)
947                         puts("Done");
948                 else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
949                         fprintf(stderr, "Everything up-to-date\n");
950
951                 return ret;
952         }
953         return 1;
954 }
955
956 const struct ref *transport_get_remote_refs(struct transport *transport)
957 {
958         if (!transport->got_remote_refs) {
959                 transport->remote_refs = transport->get_refs_list(transport, 0);
960                 transport->got_remote_refs = 1;
961         }
962
963         return transport->remote_refs;
964 }
965
966 int transport_fetch_refs(struct transport *transport, struct ref *refs)
967 {
968         int rc;
969         int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
970         struct ref **heads = NULL;
971         struct ref *rm;
972
973         for (rm = refs; rm; rm = rm->next) {
974                 nr_refs++;
975                 if (rm->peer_ref &&
976                     !is_null_oid(&rm->old_oid) &&
977                     !oidcmp(&rm->peer_ref->old_oid, &rm->old_oid))
978                         continue;
979                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
980                 heads[nr_heads++] = rm;
981         }
982
983         if (!nr_heads) {
984                 /*
985                  * When deepening of a shallow repository is requested,
986                  * then local and remote refs are likely to still be equal.
987                  * Just feed them all to the fetch method in that case.
988                  * This condition shouldn't be met in a non-deepening fetch
989                  * (see builtin/fetch.c:quickfetch()).
990                  */
991                 ALLOC_ARRAY(heads, nr_refs);
992                 for (rm = refs; rm; rm = rm->next)
993                         heads[nr_heads++] = rm;
994         }
995
996         rc = transport->fetch(transport, nr_heads, heads);
997
998         free(heads);
999         return rc;
1000 }
1001
1002 void transport_unlock_pack(struct transport *transport)
1003 {
1004         if (transport->pack_lockfile) {
1005                 unlink_or_warn(transport->pack_lockfile);
1006                 free(transport->pack_lockfile);
1007                 transport->pack_lockfile = NULL;
1008         }
1009 }
1010
1011 int transport_connect(struct transport *transport, const char *name,
1012                       const char *exec, int fd[2])
1013 {
1014         if (transport->connect)
1015                 return transport->connect(transport, name, exec, fd);
1016         else
1017                 die("Operation not supported by protocol");
1018 }
1019
1020 int transport_disconnect(struct transport *transport)
1021 {
1022         int ret = 0;
1023         if (transport->disconnect)
1024                 ret = transport->disconnect(transport);
1025         free(transport);
1026         return ret;
1027 }
1028
1029 /*
1030  * Strip username (and password) from a URL and return
1031  * it in a newly allocated string.
1032  */
1033 char *transport_anonymize_url(const char *url)
1034 {
1035         char *scheme_prefix, *anon_part;
1036         size_t anon_len, prefix_len = 0;
1037
1038         anon_part = strchr(url, '@');
1039         if (url_is_local_not_ssh(url) || !anon_part)
1040                 goto literal_copy;
1041
1042         anon_len = strlen(++anon_part);
1043         scheme_prefix = strstr(url, "://");
1044         if (!scheme_prefix) {
1045                 if (!strchr(anon_part, ':'))
1046                         /* cannot be "me@there:/path/name" */
1047                         goto literal_copy;
1048         } else {
1049                 const char *cp;
1050                 /* make sure scheme is reasonable */
1051                 for (cp = url; cp < scheme_prefix; cp++) {
1052                         switch (*cp) {
1053                                 /* RFC 1738 2.1 */
1054                         case '+': case '.': case '-':
1055                                 break; /* ok */
1056                         default:
1057                                 if (isalnum(*cp))
1058                                         break;
1059                                 /* it isn't */
1060                                 goto literal_copy;
1061                         }
1062                 }
1063                 /* @ past the first slash does not count */
1064                 cp = strchr(scheme_prefix + 3, '/');
1065                 if (cp && cp < anon_part)
1066                         goto literal_copy;
1067                 prefix_len = scheme_prefix - url + 3;
1068         }
1069         return xstrfmt("%.*s%.*s", (int)prefix_len, url,
1070                        (int)anon_len, anon_part);
1071 literal_copy:
1072         return xstrdup(url);
1073 }
1074
1075 struct alternate_refs_data {
1076         alternate_ref_fn *fn;
1077         void *data;
1078 };
1079
1080 static int refs_from_alternate_cb(struct alternate_object_database *e,
1081                                   void *data)
1082 {
1083         char *other;
1084         size_t len;
1085         struct remote *remote;
1086         struct transport *transport;
1087         const struct ref *extra;
1088         struct alternate_refs_data *cb = data;
1089
1090         e->name[-1] = '\0';
1091         other = xstrdup(real_path(e->base));
1092         e->name[-1] = '/';
1093         len = strlen(other);
1094
1095         while (other[len-1] == '/')
1096                 other[--len] = '\0';
1097         if (len < 8 || memcmp(other + len - 8, "/objects", 8))
1098                 goto out;
1099         /* Is this a git repository with refs? */
1100         memcpy(other + len - 8, "/refs", 6);
1101         if (!is_directory(other))
1102                 goto out;
1103         other[len - 8] = '\0';
1104         remote = remote_get(other);
1105         transport = transport_get(remote, other);
1106         for (extra = transport_get_remote_refs(transport);
1107              extra;
1108              extra = extra->next)
1109                 cb->fn(extra, cb->data);
1110         transport_disconnect(transport);
1111 out:
1112         free(other);
1113         return 0;
1114 }
1115
1116 void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1117 {
1118         struct alternate_refs_data cb;
1119         cb.fn = fn;
1120         cb.data = data;
1121         foreach_alt_odb(refs_from_alternate_cb, &cb);
1122 }