show_object_with_name: simplify by using path_name()
[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
19 /* rsync support */
20
21 /*
22  * We copy packed-refs and refs/ into a temporary file, then read the
23  * loose refs recursively (sorting whenever possible), and then inserting
24  * those packed refs that are not yet in the list (not validating, but
25  * assuming that the file is sorted).
26  *
27  * Appears refactoring this from refs.c is too cumbersome.
28  */
29
30 static int str_cmp(const void *a, const void *b)
31 {
32         const char *s1 = a;
33         const char *s2 = b;
34
35         return strcmp(s1, s2);
36 }
37
38 /* path->buf + name_offset is expected to point to "refs/" */
39
40 static int read_loose_refs(struct strbuf *path, int name_offset,
41                 struct ref **tail)
42 {
43         DIR *dir = opendir(path->buf);
44         struct dirent *de;
45         struct {
46                 char **entries;
47                 int nr, alloc;
48         } list;
49         int i, pathlen;
50
51         if (!dir)
52                 return -1;
53
54         memset (&list, 0, sizeof(list));
55
56         while ((de = readdir(dir))) {
57                 if (is_dot_or_dotdot(de->d_name))
58                         continue;
59                 ALLOC_GROW(list.entries, list.nr + 1, list.alloc);
60                 list.entries[list.nr++] = xstrdup(de->d_name);
61         }
62         closedir(dir);
63
64         /* sort the list */
65
66         qsort(list.entries, list.nr, sizeof(char *), str_cmp);
67
68         pathlen = path->len;
69         strbuf_addch(path, '/');
70
71         for (i = 0; i < list.nr; i++, strbuf_setlen(path, pathlen + 1)) {
72                 strbuf_addstr(path, list.entries[i]);
73                 if (read_loose_refs(path, name_offset, tail)) {
74                         int fd = open(path->buf, O_RDONLY);
75                         char buffer[40];
76                         struct ref *next;
77
78                         if (fd < 0)
79                                 continue;
80                         next = alloc_ref(path->buf + name_offset);
81                         if (read_in_full(fd, buffer, 40) != 40 ||
82                                         get_sha1_hex(buffer, next->old_sha1)) {
83                                 close(fd);
84                                 free(next);
85                                 continue;
86                         }
87                         close(fd);
88                         (*tail)->next = next;
89                         *tail = next;
90                 }
91         }
92         strbuf_setlen(path, pathlen);
93
94         for (i = 0; i < list.nr; i++)
95                 free(list.entries[i]);
96         free(list.entries);
97
98         return 0;
99 }
100
101 /* insert the packed refs for which no loose refs were found */
102
103 static void insert_packed_refs(const char *packed_refs, struct ref **list)
104 {
105         FILE *f = fopen(packed_refs, "r");
106         static char buffer[PATH_MAX];
107
108         if (!f)
109                 return;
110
111         for (;;) {
112                 int cmp = 0; /* assigned before used */
113                 int len;
114
115                 if (!fgets(buffer, sizeof(buffer), f)) {
116                         fclose(f);
117                         return;
118                 }
119
120                 if (!isxdigit(buffer[0]))
121                         continue;
122                 len = strlen(buffer);
123                 if (len && buffer[len - 1] == '\n')
124                         buffer[--len] = '\0';
125                 if (len < 41)
126                         continue;
127                 while ((*list)->next &&
128                                 (cmp = strcmp(buffer + 41,
129                                       (*list)->next->name)) > 0)
130                         list = &(*list)->next;
131                 if (!(*list)->next || cmp < 0) {
132                         struct ref *next = alloc_ref(buffer + 41);
133                         buffer[40] = '\0';
134                         if (get_sha1_hex(buffer, next->old_sha1)) {
135                                 warning ("invalid SHA-1: %s", buffer);
136                                 free(next);
137                                 continue;
138                         }
139                         next->next = (*list)->next;
140                         (*list)->next = next;
141                         list = &(*list)->next;
142                 }
143         }
144 }
145
146 static void set_upstreams(struct transport *transport, struct ref *refs,
147         int pretend)
148 {
149         struct ref *ref;
150         for (ref = refs; ref; ref = ref->next) {
151                 const char *localname;
152                 const char *tmp;
153                 const char *remotename;
154                 unsigned char sha[20];
155                 int flag = 0;
156                 /*
157                  * Check suitability for tracking. Must be successful /
158                  * already up-to-date ref create/modify (not delete).
159                  */
160                 if (ref->status != REF_STATUS_OK &&
161                         ref->status != REF_STATUS_UPTODATE)
162                         continue;
163                 if (!ref->peer_ref)
164                         continue;
165                 if (is_null_sha1(ref->new_sha1))
166                         continue;
167
168                 /* Follow symbolic refs (mainly for HEAD). */
169                 localname = ref->peer_ref->name;
170                 remotename = ref->name;
171                 tmp = resolve_ref_unsafe(localname, RESOLVE_REF_READING,
172                                          sha, &flag);
173                 if (tmp && flag & REF_ISSYMREF &&
174                         starts_with(tmp, "refs/heads/"))
175                         localname = tmp;
176
177                 /* Both source and destination must be local branches. */
178                 if (!localname || !starts_with(localname, "refs/heads/"))
179                         continue;
180                 if (!remotename || !starts_with(remotename, "refs/heads/"))
181                         continue;
182
183                 if (!pretend)
184                         install_branch_config(BRANCH_CONFIG_VERBOSE,
185                                 localname + 11, transport->remote->name,
186                                 remotename);
187                 else
188                         printf("Would set upstream of '%s' to '%s' of '%s'\n",
189                                 localname + 11, remotename + 11,
190                                 transport->remote->name);
191         }
192 }
193
194 static const char *rsync_url(const char *url)
195 {
196         if (!starts_with(url, "rsync://"))
197                 skip_prefix(url, "rsync:", &url);
198         return url;
199 }
200
201 static struct ref *get_refs_via_rsync(struct transport *transport, int for_push)
202 {
203         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
204         struct ref dummy = {NULL}, *tail = &dummy;
205         struct child_process rsync = CHILD_PROCESS_INIT;
206         const char *args[5];
207         int temp_dir_len;
208
209         if (for_push)
210                 return NULL;
211
212         /* copy the refs to the temporary directory */
213
214         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
215         if (!mkdtemp(temp_dir.buf))
216                 die_errno ("Could not make temporary directory");
217         temp_dir_len = temp_dir.len;
218
219         strbuf_addstr(&buf, rsync_url(transport->url));
220         strbuf_addstr(&buf, "/refs");
221
222         rsync.argv = args;
223         rsync.stdout_to_stderr = 1;
224         args[0] = "rsync";
225         args[1] = (transport->verbose > 1) ? "-rv" : "-r";
226         args[2] = buf.buf;
227         args[3] = temp_dir.buf;
228         args[4] = NULL;
229
230         if (run_command(&rsync))
231                 die ("Could not run rsync to get refs");
232
233         strbuf_reset(&buf);
234         strbuf_addstr(&buf, rsync_url(transport->url));
235         strbuf_addstr(&buf, "/packed-refs");
236
237         args[2] = buf.buf;
238
239         if (run_command(&rsync))
240                 die ("Could not run rsync to get refs");
241
242         /* read the copied refs */
243
244         strbuf_addstr(&temp_dir, "/refs");
245         read_loose_refs(&temp_dir, temp_dir_len + 1, &tail);
246         strbuf_setlen(&temp_dir, temp_dir_len);
247
248         tail = &dummy;
249         strbuf_addstr(&temp_dir, "/packed-refs");
250         insert_packed_refs(temp_dir.buf, &tail);
251         strbuf_setlen(&temp_dir, temp_dir_len);
252
253         if (remove_dir_recursively(&temp_dir, 0))
254                 warning ("Error removing temporary directory %s.",
255                                 temp_dir.buf);
256
257         strbuf_release(&buf);
258         strbuf_release(&temp_dir);
259
260         return dummy.next;
261 }
262
263 static int fetch_objs_via_rsync(struct transport *transport,
264                                 int nr_objs, struct ref **to_fetch)
265 {
266         struct child_process rsync = CHILD_PROCESS_INIT;
267
268         rsync.stdout_to_stderr = 1;
269         argv_array_push(&rsync.args, "rsync");
270         argv_array_push(&rsync.args, (transport->verbose > 1) ? "-rv" : "-r");
271         argv_array_push(&rsync.args, "--ignore-existing");
272         argv_array_push(&rsync.args, "--exclude");
273         argv_array_push(&rsync.args, "info");
274         argv_array_pushf(&rsync.args, "%s/objects/", rsync_url(transport->url));
275         argv_array_push(&rsync.args, get_object_directory());
276
277         /* NEEDSWORK: handle one level of alternates */
278         return run_command(&rsync);
279 }
280
281 static int write_one_ref(const char *name, const unsigned char *sha1,
282                 int flags, void *data)
283 {
284         struct strbuf *buf = data;
285         int len = buf->len;
286         FILE *f;
287
288         /* when called via for_each_ref(), flags is non-zero */
289         if (flags && !starts_with(name, "refs/heads/") &&
290                         !starts_with(name, "refs/tags/"))
291                 return 0;
292
293         strbuf_addstr(buf, name);
294         if (safe_create_leading_directories(buf->buf) ||
295                         !(f = fopen(buf->buf, "w")) ||
296                         fprintf(f, "%s\n", sha1_to_hex(sha1)) < 0 ||
297                         fclose(f))
298                 return error("problems writing temporary file %s", buf->buf);
299         strbuf_setlen(buf, len);
300         return 0;
301 }
302
303 static int write_refs_to_temp_dir(struct strbuf *temp_dir,
304                 int refspec_nr, const char **refspec)
305 {
306         int i;
307
308         for (i = 0; i < refspec_nr; i++) {
309                 unsigned char sha1[20];
310                 char *ref;
311
312                 if (dwim_ref(refspec[i], strlen(refspec[i]), sha1, &ref) != 1)
313                         return error("Could not get ref %s", refspec[i]);
314
315                 if (write_one_ref(ref, sha1, 0, temp_dir)) {
316                         free(ref);
317                         return -1;
318                 }
319                 free(ref);
320         }
321         return 0;
322 }
323
324 static int rsync_transport_push(struct transport *transport,
325                 int refspec_nr, const char **refspec, int flags)
326 {
327         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
328         int result = 0, i;
329         struct child_process rsync = CHILD_PROCESS_INIT;
330         const char *args[10];
331
332         if (flags & TRANSPORT_PUSH_MIRROR)
333                 return error("rsync transport does not support mirror mode");
334
335         /* first push the objects */
336
337         strbuf_addstr(&buf, rsync_url(transport->url));
338         strbuf_addch(&buf, '/');
339
340         rsync.argv = args;
341         rsync.stdout_to_stderr = 1;
342         i = 0;
343         args[i++] = "rsync";
344         args[i++] = "-a";
345         if (flags & TRANSPORT_PUSH_DRY_RUN)
346                 args[i++] = "--dry-run";
347         if (transport->verbose > 1)
348                 args[i++] = "-v";
349         args[i++] = "--ignore-existing";
350         args[i++] = "--exclude";
351         args[i++] = "info";
352         args[i++] = get_object_directory();
353         args[i++] = buf.buf;
354         args[i++] = NULL;
355
356         if (run_command(&rsync))
357                 return error("Could not push objects to %s",
358                                 rsync_url(transport->url));
359
360         /* copy the refs to the temporary directory; they could be packed. */
361
362         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
363         if (!mkdtemp(temp_dir.buf))
364                 die_errno ("Could not make temporary directory");
365         strbuf_addch(&temp_dir, '/');
366
367         if (flags & TRANSPORT_PUSH_ALL) {
368                 if (for_each_ref(write_one_ref, &temp_dir))
369                         return -1;
370         } else if (write_refs_to_temp_dir(&temp_dir, refspec_nr, refspec))
371                 return -1;
372
373         i = 2;
374         if (flags & TRANSPORT_PUSH_DRY_RUN)
375                 args[i++] = "--dry-run";
376         if (!(flags & TRANSPORT_PUSH_FORCE))
377                 args[i++] = "--ignore-existing";
378         args[i++] = temp_dir.buf;
379         args[i++] = rsync_url(transport->url);
380         args[i++] = NULL;
381         if (run_command(&rsync))
382                 result = error("Could not push to %s",
383                                 rsync_url(transport->url));
384
385         if (remove_dir_recursively(&temp_dir, 0))
386                 warning ("Could not remove temporary directory %s.",
387                                 temp_dir.buf);
388
389         strbuf_release(&buf);
390         strbuf_release(&temp_dir);
391
392         return result;
393 }
394
395 struct bundle_transport_data {
396         int fd;
397         struct bundle_header header;
398 };
399
400 static struct ref *get_refs_from_bundle(struct transport *transport, int for_push)
401 {
402         struct bundle_transport_data *data = transport->data;
403         struct ref *result = NULL;
404         int i;
405
406         if (for_push)
407                 return NULL;
408
409         if (data->fd > 0)
410                 close(data->fd);
411         data->fd = read_bundle_header(transport->url, &data->header);
412         if (data->fd < 0)
413                 die ("Could not read bundle '%s'.", transport->url);
414         for (i = 0; i < data->header.references.nr; i++) {
415                 struct ref_list_entry *e = data->header.references.list + i;
416                 struct ref *ref = alloc_ref(e->name);
417                 hashcpy(ref->old_sha1, e->sha1);
418                 ref->next = result;
419                 result = ref;
420         }
421         return result;
422 }
423
424 static int fetch_refs_from_bundle(struct transport *transport,
425                                int nr_heads, struct ref **to_fetch)
426 {
427         struct bundle_transport_data *data = transport->data;
428         return unbundle(&data->header, data->fd,
429                         transport->progress ? BUNDLE_VERBOSE : 0);
430 }
431
432 static int close_bundle(struct transport *transport)
433 {
434         struct bundle_transport_data *data = transport->data;
435         if (data->fd > 0)
436                 close(data->fd);
437         free(data);
438         return 0;
439 }
440
441 struct git_transport_data {
442         struct git_transport_options options;
443         struct child_process *conn;
444         int fd[2];
445         unsigned got_remote_heads : 1;
446         struct sha1_array extra_have;
447         struct sha1_array shallow;
448 };
449
450 static int set_git_option(struct git_transport_options *opts,
451                           const char *name, const char *value)
452 {
453         if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
454                 opts->uploadpack = value;
455                 return 0;
456         } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
457                 opts->receivepack = value;
458                 return 0;
459         } else if (!strcmp(name, TRANS_OPT_THIN)) {
460                 opts->thin = !!value;
461                 return 0;
462         } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
463                 opts->followtags = !!value;
464                 return 0;
465         } else if (!strcmp(name, TRANS_OPT_KEEP)) {
466                 opts->keep = !!value;
467                 return 0;
468         } else if (!strcmp(name, TRANS_OPT_UPDATE_SHALLOW)) {
469                 opts->update_shallow = !!value;
470                 return 0;
471         } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
472                 if (!value)
473                         opts->depth = 0;
474                 else {
475                         char *end;
476                         opts->depth = strtol(value, &end, 0);
477                         if (*end)
478                                 die("transport: invalid depth option '%s'", value);
479                 }
480                 return 0;
481         } else if (!strcmp(name, TRANS_OPT_PUSH_CERT)) {
482                 opts->push_cert = !!value;
483                 return 0;
484         }
485         return 1;
486 }
487
488 static int connect_setup(struct transport *transport, int for_push, int verbose)
489 {
490         struct git_transport_data *data = transport->data;
491
492         if (data->conn)
493                 return 0;
494
495         data->conn = git_connect(data->fd, transport->url,
496                                  for_push ? data->options.receivepack :
497                                  data->options.uploadpack,
498                                  verbose ? CONNECT_VERBOSE : 0);
499
500         return 0;
501 }
502
503 static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
504 {
505         struct git_transport_data *data = transport->data;
506         struct ref *refs;
507
508         connect_setup(transport, for_push, 0);
509         get_remote_heads(data->fd[0], NULL, 0, &refs,
510                          for_push ? REF_NORMAL : 0,
511                          &data->extra_have,
512                          &data->shallow);
513         data->got_remote_heads = 1;
514
515         return refs;
516 }
517
518 static int fetch_refs_via_pack(struct transport *transport,
519                                int nr_heads, struct ref **to_fetch)
520 {
521         struct git_transport_data *data = transport->data;
522         struct ref *refs;
523         char *dest = xstrdup(transport->url);
524         struct fetch_pack_args args;
525         struct ref *refs_tmp = NULL;
526
527         memset(&args, 0, sizeof(args));
528         args.uploadpack = data->options.uploadpack;
529         args.keep_pack = data->options.keep;
530         args.lock_pack = 1;
531         args.use_thin_pack = data->options.thin;
532         args.include_tag = data->options.followtags;
533         args.verbose = (transport->verbose > 1);
534         args.quiet = (transport->verbose < 0);
535         args.no_progress = !transport->progress;
536         args.depth = data->options.depth;
537         args.check_self_contained_and_connected =
538                 data->options.check_self_contained_and_connected;
539         args.cloning = transport->cloning;
540         args.update_shallow = data->options.update_shallow;
541
542         if (!data->got_remote_heads) {
543                 connect_setup(transport, 0, 0);
544                 get_remote_heads(data->fd[0], NULL, 0, &refs_tmp, 0,
545                                  NULL, &data->shallow);
546                 data->got_remote_heads = 1;
547         }
548
549         refs = fetch_pack(&args, data->fd, data->conn,
550                           refs_tmp ? refs_tmp : transport->remote_refs,
551                           dest, to_fetch, nr_heads, &data->shallow,
552                           &transport->pack_lockfile);
553         close(data->fd[0]);
554         close(data->fd[1]);
555         if (finish_connect(data->conn)) {
556                 free_refs(refs);
557                 refs = NULL;
558         }
559         data->conn = NULL;
560         data->got_remote_heads = 0;
561         data->options.self_contained_and_connected =
562                 args.self_contained_and_connected;
563
564         free_refs(refs_tmp);
565         free_refs(refs);
566         free(dest);
567         return (refs ? 0 : -1);
568 }
569
570 static int push_had_errors(struct ref *ref)
571 {
572         for (; ref; ref = ref->next) {
573                 switch (ref->status) {
574                 case REF_STATUS_NONE:
575                 case REF_STATUS_UPTODATE:
576                 case REF_STATUS_OK:
577                         break;
578                 default:
579                         return 1;
580                 }
581         }
582         return 0;
583 }
584
585 int transport_refs_pushed(struct ref *ref)
586 {
587         for (; ref; ref = ref->next) {
588                 switch(ref->status) {
589                 case REF_STATUS_NONE:
590                 case REF_STATUS_UPTODATE:
591                         break;
592                 default:
593                         return 1;
594                 }
595         }
596         return 0;
597 }
598
599 void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
600 {
601         struct refspec rs;
602
603         if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
604                 return;
605
606         rs.src = ref->name;
607         rs.dst = NULL;
608
609         if (!remote_find_tracking(remote, &rs)) {
610                 if (verbose)
611                         fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
612                 if (ref->deletion) {
613                         delete_ref(rs.dst, NULL, 0);
614                 } else
615                         update_ref("update by push", rs.dst,
616                                         ref->new_sha1, NULL, 0, 0);
617                 free(rs.dst);
618         }
619 }
620
621 static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg, int porcelain)
622 {
623         if (porcelain) {
624                 if (from)
625                         fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
626                 else
627                         fprintf(stdout, "%c\t:%s\t", flag, to->name);
628                 if (msg)
629                         fprintf(stdout, "%s (%s)\n", summary, msg);
630                 else
631                         fprintf(stdout, "%s\n", summary);
632         } else {
633                 fprintf(stderr, " %c %-*s ", flag, TRANSPORT_SUMMARY_WIDTH, summary);
634                 if (from)
635                         fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
636                 else
637                         fputs(prettify_refname(to->name), stderr);
638                 if (msg) {
639                         fputs(" (", stderr);
640                         fputs(msg, stderr);
641                         fputc(')', stderr);
642                 }
643                 fputc('\n', stderr);
644         }
645 }
646
647 static const char *status_abbrev(unsigned char sha1[20])
648 {
649         return find_unique_abbrev(sha1, DEFAULT_ABBREV);
650 }
651
652 static void print_ok_ref_status(struct ref *ref, int porcelain)
653 {
654         if (ref->deletion)
655                 print_ref_status('-', "[deleted]", ref, NULL, NULL, porcelain);
656         else if (is_null_sha1(ref->old_sha1))
657                 print_ref_status('*',
658                         (starts_with(ref->name, "refs/tags/") ? "[new tag]" :
659                         "[new branch]"),
660                         ref, ref->peer_ref, NULL, porcelain);
661         else {
662                 char quickref[84];
663                 char type;
664                 const char *msg;
665
666                 strcpy(quickref, status_abbrev(ref->old_sha1));
667                 if (ref->forced_update) {
668                         strcat(quickref, "...");
669                         type = '+';
670                         msg = "forced update";
671                 } else {
672                         strcat(quickref, "..");
673                         type = ' ';
674                         msg = NULL;
675                 }
676                 strcat(quickref, status_abbrev(ref->new_sha1));
677
678                 print_ref_status(type, quickref, ref, ref->peer_ref, msg, porcelain);
679         }
680 }
681
682 static int print_one_push_status(struct ref *ref, const char *dest, int count, int porcelain)
683 {
684         if (!count)
685                 fprintf(porcelain ? stdout : stderr, "To %s\n", dest);
686
687         switch(ref->status) {
688         case REF_STATUS_NONE:
689                 print_ref_status('X', "[no match]", ref, NULL, NULL, porcelain);
690                 break;
691         case REF_STATUS_REJECT_NODELETE:
692                 print_ref_status('!', "[rejected]", ref, NULL,
693                                                  "remote does not support deleting refs", porcelain);
694                 break;
695         case REF_STATUS_UPTODATE:
696                 print_ref_status('=', "[up to date]", ref,
697                                                  ref->peer_ref, NULL, porcelain);
698                 break;
699         case REF_STATUS_REJECT_NONFASTFORWARD:
700                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
701                                                  "non-fast-forward", porcelain);
702                 break;
703         case REF_STATUS_REJECT_ALREADY_EXISTS:
704                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
705                                                  "already exists", porcelain);
706                 break;
707         case REF_STATUS_REJECT_FETCH_FIRST:
708                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
709                                                  "fetch first", porcelain);
710                 break;
711         case REF_STATUS_REJECT_NEEDS_FORCE:
712                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
713                                                  "needs force", porcelain);
714                 break;
715         case REF_STATUS_REJECT_STALE:
716                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
717                                                  "stale info", porcelain);
718                 break;
719         case REF_STATUS_REJECT_SHALLOW:
720                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
721                                                  "new shallow roots not allowed", porcelain);
722                 break;
723         case REF_STATUS_REMOTE_REJECT:
724                 print_ref_status('!', "[remote rejected]", ref,
725                                                  ref->deletion ? NULL : ref->peer_ref,
726                                                  ref->remote_status, porcelain);
727                 break;
728         case REF_STATUS_EXPECTING_REPORT:
729                 print_ref_status('!', "[remote failure]", ref,
730                                                  ref->deletion ? NULL : ref->peer_ref,
731                                                  "remote failed to report status", porcelain);
732                 break;
733         case REF_STATUS_ATOMIC_PUSH_FAILED:
734                 print_ref_status('!', "[rejected]", ref, ref->peer_ref,
735                                                  "atomic push failed", porcelain);
736                 break;
737         case REF_STATUS_OK:
738                 print_ok_ref_status(ref, porcelain);
739                 break;
740         }
741
742         return 1;
743 }
744
745 void transport_print_push_status(const char *dest, struct ref *refs,
746                                   int verbose, int porcelain, unsigned int *reject_reasons)
747 {
748         struct ref *ref;
749         int n = 0;
750         unsigned char head_sha1[20];
751         char *head;
752
753         head = resolve_refdup("HEAD", RESOLVE_REF_READING, head_sha1, NULL);
754
755         if (verbose) {
756                 for (ref = refs; ref; ref = ref->next)
757                         if (ref->status == REF_STATUS_UPTODATE)
758                                 n += print_one_push_status(ref, dest, n, porcelain);
759         }
760
761         for (ref = refs; ref; ref = ref->next)
762                 if (ref->status == REF_STATUS_OK)
763                         n += print_one_push_status(ref, dest, n, porcelain);
764
765         *reject_reasons = 0;
766         for (ref = refs; ref; ref = ref->next) {
767                 if (ref->status != REF_STATUS_NONE &&
768                     ref->status != REF_STATUS_UPTODATE &&
769                     ref->status != REF_STATUS_OK)
770                         n += print_one_push_status(ref, dest, n, porcelain);
771                 if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
772                         if (head != NULL && !strcmp(head, ref->name))
773                                 *reject_reasons |= REJECT_NON_FF_HEAD;
774                         else
775                                 *reject_reasons |= REJECT_NON_FF_OTHER;
776                 } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
777                         *reject_reasons |= REJECT_ALREADY_EXISTS;
778                 } else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
779                         *reject_reasons |= REJECT_FETCH_FIRST;
780                 } else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
781                         *reject_reasons |= REJECT_NEEDS_FORCE;
782                 }
783         }
784         free(head);
785 }
786
787 void transport_verify_remote_names(int nr_heads, const char **heads)
788 {
789         int i;
790
791         for (i = 0; i < nr_heads; i++) {
792                 const char *local = heads[i];
793                 const char *remote = strrchr(heads[i], ':');
794
795                 if (*local == '+')
796                         local++;
797
798                 /* A matching refspec is okay.  */
799                 if (remote == local && remote[1] == '\0')
800                         continue;
801
802                 remote = remote ? (remote + 1) : local;
803                 if (check_refname_format(remote,
804                                 REFNAME_ALLOW_ONELEVEL|REFNAME_REFSPEC_PATTERN))
805                         die("remote part of refspec is not a valid name in %s",
806                                 heads[i]);
807         }
808 }
809
810 static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
811 {
812         struct git_transport_data *data = transport->data;
813         struct send_pack_args args;
814         int ret;
815
816         if (!data->got_remote_heads) {
817                 struct ref *tmp_refs;
818                 connect_setup(transport, 1, 0);
819
820                 get_remote_heads(data->fd[0], NULL, 0, &tmp_refs, REF_NORMAL,
821                                  NULL, &data->shallow);
822                 data->got_remote_heads = 1;
823         }
824
825         memset(&args, 0, sizeof(args));
826         args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
827         args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
828         args.use_thin_pack = data->options.thin;
829         args.verbose = (transport->verbose > 0);
830         args.quiet = (transport->verbose < 0);
831         args.progress = transport->progress;
832         args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
833         args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
834         args.push_cert = !!(flags & TRANSPORT_PUSH_CERT);
835         args.atomic = !!(flags & TRANSPORT_PUSH_ATOMIC);
836         args.url = transport->url;
837
838         ret = send_pack(&args, data->fd, data->conn, remote_refs,
839                         &data->extra_have);
840
841         close(data->fd[1]);
842         close(data->fd[0]);
843         ret |= finish_connect(data->conn);
844         data->conn = NULL;
845         data->got_remote_heads = 0;
846
847         return ret;
848 }
849
850 static int connect_git(struct transport *transport, const char *name,
851                        const char *executable, int fd[2])
852 {
853         struct git_transport_data *data = transport->data;
854         data->conn = git_connect(data->fd, transport->url,
855                                  executable, 0);
856         fd[0] = data->fd[0];
857         fd[1] = data->fd[1];
858         return 0;
859 }
860
861 static int disconnect_git(struct transport *transport)
862 {
863         struct git_transport_data *data = transport->data;
864         if (data->conn) {
865                 if (data->got_remote_heads)
866                         packet_flush(data->fd[1]);
867                 close(data->fd[0]);
868                 close(data->fd[1]);
869                 finish_connect(data->conn);
870         }
871
872         free(data);
873         return 0;
874 }
875
876 void transport_take_over(struct transport *transport,
877                          struct child_process *child)
878 {
879         struct git_transport_data *data;
880
881         if (!transport->smart_options)
882                 die("Bug detected: Taking over transport requires non-NULL "
883                     "smart_options field.");
884
885         data = xcalloc(1, sizeof(*data));
886         data->options = *transport->smart_options;
887         data->conn = child;
888         data->fd[0] = data->conn->out;
889         data->fd[1] = data->conn->in;
890         data->got_remote_heads = 0;
891         transport->data = data;
892
893         transport->set_option = NULL;
894         transport->get_refs_list = get_refs_via_connect;
895         transport->fetch = fetch_refs_via_pack;
896         transport->push = NULL;
897         transport->push_refs = git_transport_push;
898         transport->disconnect = disconnect_git;
899         transport->smart_options = &(data->options);
900
901         transport->cannot_reuse = 1;
902 }
903
904 static int is_file(const char *url)
905 {
906         struct stat buf;
907         if (stat(url, &buf))
908                 return 0;
909         return S_ISREG(buf.st_mode);
910 }
911
912 static int external_specification_len(const char *url)
913 {
914         return strchr(url, ':') - url;
915 }
916
917 static const struct string_list *protocol_whitelist(void)
918 {
919         static int enabled = -1;
920         static struct string_list allowed = STRING_LIST_INIT_DUP;
921
922         if (enabled < 0) {
923                 const char *v = getenv("GIT_ALLOW_PROTOCOL");
924                 if (v) {
925                         string_list_split(&allowed, v, ':', -1);
926                         string_list_sort(&allowed);
927                         enabled = 1;
928                 } else {
929                         enabled = 0;
930                 }
931         }
932
933         return enabled ? &allowed : NULL;
934 }
935
936 int is_transport_allowed(const char *type)
937 {
938         const struct string_list *allowed = protocol_whitelist();
939         return !allowed || string_list_has_string(allowed, type);
940 }
941
942 void transport_check_allowed(const char *type)
943 {
944         if (!is_transport_allowed(type))
945                 die("transport '%s' not allowed", type);
946 }
947
948 int transport_restrict_protocols(void)
949 {
950         return !!protocol_whitelist();
951 }
952
953 struct transport *transport_get(struct remote *remote, const char *url)
954 {
955         const char *helper;
956         struct transport *ret = xcalloc(1, sizeof(*ret));
957
958         ret->progress = isatty(2);
959
960         if (!remote)
961                 die("No remote provided to transport_get()");
962
963         ret->got_remote_refs = 0;
964         ret->remote = remote;
965         helper = remote->foreign_vcs;
966
967         if (!url && remote->url)
968                 url = remote->url[0];
969         ret->url = url;
970
971         /* maybe it is a foreign URL? */
972         if (url) {
973                 const char *p = url;
974
975                 while (is_urlschemechar(p == url, *p))
976                         p++;
977                 if (starts_with(p, "::"))
978                         helper = xstrndup(url, p - url);
979         }
980
981         if (helper) {
982                 transport_helper_init(ret, helper);
983         } else if (starts_with(url, "rsync:")) {
984                 transport_check_allowed("rsync");
985                 ret->get_refs_list = get_refs_via_rsync;
986                 ret->fetch = fetch_objs_via_rsync;
987                 ret->push = rsync_transport_push;
988                 ret->smart_options = NULL;
989         } else if (url_is_local_not_ssh(url) && is_file(url) && is_bundle(url, 1)) {
990                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
991                 transport_check_allowed("file");
992                 ret->data = data;
993                 ret->get_refs_list = get_refs_from_bundle;
994                 ret->fetch = fetch_refs_from_bundle;
995                 ret->disconnect = close_bundle;
996                 ret->smart_options = NULL;
997         } else if (!is_url(url)
998                 || starts_with(url, "file://")
999                 || starts_with(url, "git://")
1000                 || starts_with(url, "ssh://")
1001                 || starts_with(url, "git+ssh://")
1002                 || starts_with(url, "ssh+git://")) {
1003                 /*
1004                  * These are builtin smart transports; "allowed" transports
1005                  * will be checked individually in git_connect.
1006                  */
1007                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
1008                 ret->data = data;
1009                 ret->set_option = NULL;
1010                 ret->get_refs_list = get_refs_via_connect;
1011                 ret->fetch = fetch_refs_via_pack;
1012                 ret->push_refs = git_transport_push;
1013                 ret->connect = connect_git;
1014                 ret->disconnect = disconnect_git;
1015                 ret->smart_options = &(data->options);
1016
1017                 data->conn = NULL;
1018                 data->got_remote_heads = 0;
1019         } else {
1020                 /* Unknown protocol in URL. Pass to external handler. */
1021                 int len = external_specification_len(url);
1022                 char *handler = xmemdupz(url, len);
1023                 transport_helper_init(ret, handler);
1024         }
1025
1026         if (ret->smart_options) {
1027                 ret->smart_options->thin = 1;
1028                 ret->smart_options->uploadpack = "git-upload-pack";
1029                 if (remote->uploadpack)
1030                         ret->smart_options->uploadpack = remote->uploadpack;
1031                 ret->smart_options->receivepack = "git-receive-pack";
1032                 if (remote->receivepack)
1033                         ret->smart_options->receivepack = remote->receivepack;
1034         }
1035
1036         return ret;
1037 }
1038
1039 int transport_set_option(struct transport *transport,
1040                          const char *name, const char *value)
1041 {
1042         int git_reports = 1, protocol_reports = 1;
1043
1044         if (transport->smart_options)
1045                 git_reports = set_git_option(transport->smart_options,
1046                                              name, value);
1047
1048         if (transport->set_option)
1049                 protocol_reports = transport->set_option(transport, name,
1050                                                         value);
1051
1052         /* If either report is 0, report 0 (success). */
1053         if (!git_reports || !protocol_reports)
1054                 return 0;
1055         /* If either reports -1 (invalid value), report -1. */
1056         if ((git_reports == -1) || (protocol_reports == -1))
1057                 return -1;
1058         /* Otherwise if both report unknown, report unknown. */
1059         return 1;
1060 }
1061
1062 void transport_set_verbosity(struct transport *transport, int verbosity,
1063         int force_progress)
1064 {
1065         if (verbosity >= 1)
1066                 transport->verbose = verbosity <= 3 ? verbosity : 3;
1067         if (verbosity < 0)
1068                 transport->verbose = -1;
1069
1070         /**
1071          * Rules used to determine whether to report progress (processing aborts
1072          * when a rule is satisfied):
1073          *
1074          *   . Report progress, if force_progress is 1 (ie. --progress).
1075          *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
1076          *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
1077          *   . Report progress if isatty(2) is 1.
1078          **/
1079         if (force_progress >= 0)
1080                 transport->progress = !!force_progress;
1081         else
1082                 transport->progress = verbosity >= 0 && isatty(2);
1083 }
1084
1085 static void die_with_unpushed_submodules(struct string_list *needs_pushing)
1086 {
1087         int i;
1088
1089         fprintf(stderr, "The following submodule paths contain changes that can\n"
1090                         "not be found on any remote:\n");
1091         for (i = 0; i < needs_pushing->nr; i++)
1092                 printf("  %s\n", needs_pushing->items[i].string);
1093         fprintf(stderr, "\nPlease try\n\n"
1094                         "       git push --recurse-submodules=on-demand\n\n"
1095                         "or cd to the path and use\n\n"
1096                         "       git push\n\n"
1097                         "to push them to a remote.\n\n");
1098
1099         string_list_clear(needs_pushing, 0);
1100
1101         die("Aborting.");
1102 }
1103
1104 static int run_pre_push_hook(struct transport *transport,
1105                              struct ref *remote_refs)
1106 {
1107         int ret = 0, x;
1108         struct ref *r;
1109         struct child_process proc = CHILD_PROCESS_INIT;
1110         struct strbuf buf;
1111         const char *argv[4];
1112
1113         if (!(argv[0] = find_hook("pre-push")))
1114                 return 0;
1115
1116         argv[1] = transport->remote->name;
1117         argv[2] = transport->url;
1118         argv[3] = NULL;
1119
1120         proc.argv = argv;
1121         proc.in = -1;
1122
1123         if (start_command(&proc)) {
1124                 finish_command(&proc);
1125                 return -1;
1126         }
1127
1128         strbuf_init(&buf, 256);
1129
1130         for (r = remote_refs; r; r = r->next) {
1131                 if (!r->peer_ref) continue;
1132                 if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
1133                 if (r->status == REF_STATUS_REJECT_STALE) continue;
1134                 if (r->status == REF_STATUS_UPTODATE) continue;
1135
1136                 strbuf_reset(&buf);
1137                 strbuf_addf( &buf, "%s %s %s %s\n",
1138                          r->peer_ref->name, sha1_to_hex(r->new_sha1),
1139                          r->name, sha1_to_hex(r->old_sha1));
1140
1141                 if (write_in_full(proc.in, buf.buf, buf.len) != buf.len) {
1142                         ret = -1;
1143                         break;
1144                 }
1145         }
1146
1147         strbuf_release(&buf);
1148
1149         x = close(proc.in);
1150         if (!ret)
1151                 ret = x;
1152
1153         x = finish_command(&proc);
1154         if (!ret)
1155                 ret = x;
1156
1157         return ret;
1158 }
1159
1160 int transport_push(struct transport *transport,
1161                    int refspec_nr, const char **refspec, int flags,
1162                    unsigned int *reject_reasons)
1163 {
1164         *reject_reasons = 0;
1165         transport_verify_remote_names(refspec_nr, refspec);
1166
1167         if (transport->push) {
1168                 /* Maybe FIXME. But no important transport uses this case. */
1169                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1170                         die("This transport does not support using --set-upstream");
1171
1172                 return transport->push(transport, refspec_nr, refspec, flags);
1173         } else if (transport->push_refs) {
1174                 struct ref *remote_refs;
1175                 struct ref *local_refs = get_local_heads();
1176                 int match_flags = MATCH_REFS_NONE;
1177                 int verbose = (transport->verbose > 0);
1178                 int quiet = (transport->verbose < 0);
1179                 int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
1180                 int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
1181                 int push_ret, ret, err;
1182
1183                 if (check_push_refs(local_refs, refspec_nr, refspec) < 0)
1184                         return -1;
1185
1186                 remote_refs = transport->get_refs_list(transport, 1);
1187
1188                 if (flags & TRANSPORT_PUSH_ALL)
1189                         match_flags |= MATCH_REFS_ALL;
1190                 if (flags & TRANSPORT_PUSH_MIRROR)
1191                         match_flags |= MATCH_REFS_MIRROR;
1192                 if (flags & TRANSPORT_PUSH_PRUNE)
1193                         match_flags |= MATCH_REFS_PRUNE;
1194                 if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
1195                         match_flags |= MATCH_REFS_FOLLOW_TAGS;
1196
1197                 if (match_push_refs(local_refs, &remote_refs,
1198                                     refspec_nr, refspec, match_flags)) {
1199                         return -1;
1200                 }
1201
1202                 if (transport->smart_options &&
1203                     transport->smart_options->cas &&
1204                     !is_empty_cas(transport->smart_options->cas))
1205                         apply_push_cas(transport->smart_options->cas,
1206                                        transport->remote, remote_refs);
1207
1208                 set_ref_status_for_push(remote_refs,
1209                         flags & TRANSPORT_PUSH_MIRROR,
1210                         flags & TRANSPORT_PUSH_FORCE);
1211
1212                 if (!(flags & TRANSPORT_PUSH_NO_HOOK))
1213                         if (run_pre_push_hook(transport, remote_refs))
1214                                 return -1;
1215
1216                 if ((flags & TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND) && !is_bare_repository()) {
1217                         struct ref *ref = remote_refs;
1218                         for (; ref; ref = ref->next)
1219                                 if (!is_null_sha1(ref->new_sha1) &&
1220                                     !push_unpushed_submodules(ref->new_sha1,
1221                                             transport->remote->name))
1222                                     die ("Failed to push all needed submodules!");
1223                 }
1224
1225                 if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1226                               TRANSPORT_RECURSE_SUBMODULES_CHECK)) && !is_bare_repository()) {
1227                         struct ref *ref = remote_refs;
1228                         struct string_list needs_pushing = STRING_LIST_INIT_DUP;
1229
1230                         for (; ref; ref = ref->next)
1231                                 if (!is_null_sha1(ref->new_sha1) &&
1232                                     find_unpushed_submodules(ref->new_sha1,
1233                                             transport->remote->name, &needs_pushing))
1234                                         die_with_unpushed_submodules(&needs_pushing);
1235                 }
1236
1237                 push_ret = transport->push_refs(transport, remote_refs, flags);
1238                 err = push_had_errors(remote_refs);
1239                 ret = push_ret | err;
1240
1241                 if (!quiet || err)
1242                         transport_print_push_status(transport->url, remote_refs,
1243                                         verbose | porcelain, porcelain,
1244                                         reject_reasons);
1245
1246                 if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1247                         set_upstreams(transport, remote_refs, pretend);
1248
1249                 if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
1250                         struct ref *ref;
1251                         for (ref = remote_refs; ref; ref = ref->next)
1252                                 transport_update_tracking_ref(transport->remote, ref, verbose);
1253                 }
1254
1255                 if (porcelain && !push_ret)
1256                         puts("Done");
1257                 else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
1258                         fprintf(stderr, "Everything up-to-date\n");
1259
1260                 return ret;
1261         }
1262         return 1;
1263 }
1264
1265 const struct ref *transport_get_remote_refs(struct transport *transport)
1266 {
1267         if (!transport->got_remote_refs) {
1268                 transport->remote_refs = transport->get_refs_list(transport, 0);
1269                 transport->got_remote_refs = 1;
1270         }
1271
1272         return transport->remote_refs;
1273 }
1274
1275 int transport_fetch_refs(struct transport *transport, struct ref *refs)
1276 {
1277         int rc;
1278         int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1279         struct ref **heads = NULL;
1280         struct ref *rm;
1281
1282         for (rm = refs; rm; rm = rm->next) {
1283                 nr_refs++;
1284                 if (rm->peer_ref &&
1285                     !is_null_sha1(rm->old_sha1) &&
1286                     !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
1287                         continue;
1288                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1289                 heads[nr_heads++] = rm;
1290         }
1291
1292         if (!nr_heads) {
1293                 /*
1294                  * When deepening of a shallow repository is requested,
1295                  * then local and remote refs are likely to still be equal.
1296                  * Just feed them all to the fetch method in that case.
1297                  * This condition shouldn't be met in a non-deepening fetch
1298                  * (see builtin/fetch.c:quickfetch()).
1299                  */
1300                 heads = xmalloc(nr_refs * sizeof(*heads));
1301                 for (rm = refs; rm; rm = rm->next)
1302                         heads[nr_heads++] = rm;
1303         }
1304
1305         rc = transport->fetch(transport, nr_heads, heads);
1306
1307         free(heads);
1308         return rc;
1309 }
1310
1311 void transport_unlock_pack(struct transport *transport)
1312 {
1313         if (transport->pack_lockfile) {
1314                 unlink_or_warn(transport->pack_lockfile);
1315                 free(transport->pack_lockfile);
1316                 transport->pack_lockfile = NULL;
1317         }
1318 }
1319
1320 int transport_connect(struct transport *transport, const char *name,
1321                       const char *exec, int fd[2])
1322 {
1323         if (transport->connect)
1324                 return transport->connect(transport, name, exec, fd);
1325         else
1326                 die("Operation not supported by protocol");
1327 }
1328
1329 int transport_disconnect(struct transport *transport)
1330 {
1331         int ret = 0;
1332         if (transport->disconnect)
1333                 ret = transport->disconnect(transport);
1334         free(transport);
1335         return ret;
1336 }
1337
1338 /*
1339  * Strip username (and password) from a URL and return
1340  * it in a newly allocated string.
1341  */
1342 char *transport_anonymize_url(const char *url)
1343 {
1344         char *anon_url, *scheme_prefix, *anon_part;
1345         size_t anon_len, prefix_len = 0;
1346
1347         anon_part = strchr(url, '@');
1348         if (url_is_local_not_ssh(url) || !anon_part)
1349                 goto literal_copy;
1350
1351         anon_len = strlen(++anon_part);
1352         scheme_prefix = strstr(url, "://");
1353         if (!scheme_prefix) {
1354                 if (!strchr(anon_part, ':'))
1355                         /* cannot be "me@there:/path/name" */
1356                         goto literal_copy;
1357         } else {
1358                 const char *cp;
1359                 /* make sure scheme is reasonable */
1360                 for (cp = url; cp < scheme_prefix; cp++) {
1361                         switch (*cp) {
1362                                 /* RFC 1738 2.1 */
1363                         case '+': case '.': case '-':
1364                                 break; /* ok */
1365                         default:
1366                                 if (isalnum(*cp))
1367                                         break;
1368                                 /* it isn't */
1369                                 goto literal_copy;
1370                         }
1371                 }
1372                 /* @ past the first slash does not count */
1373                 cp = strchr(scheme_prefix + 3, '/');
1374                 if (cp && cp < anon_part)
1375                         goto literal_copy;
1376                 prefix_len = scheme_prefix - url + 3;
1377         }
1378         anon_url = xcalloc(1, 1 + prefix_len + anon_len);
1379         memcpy(anon_url, url, prefix_len);
1380         memcpy(anon_url + prefix_len, anon_part, anon_len);
1381         return anon_url;
1382 literal_copy:
1383         return xstrdup(url);
1384 }
1385
1386 struct alternate_refs_data {
1387         alternate_ref_fn *fn;
1388         void *data;
1389 };
1390
1391 static int refs_from_alternate_cb(struct alternate_object_database *e,
1392                                   void *data)
1393 {
1394         char *other;
1395         size_t len;
1396         struct remote *remote;
1397         struct transport *transport;
1398         const struct ref *extra;
1399         struct alternate_refs_data *cb = data;
1400
1401         e->name[-1] = '\0';
1402         other = xstrdup(real_path(e->base));
1403         e->name[-1] = '/';
1404         len = strlen(other);
1405
1406         while (other[len-1] == '/')
1407                 other[--len] = '\0';
1408         if (len < 8 || memcmp(other + len - 8, "/objects", 8))
1409                 goto out;
1410         /* Is this a git repository with refs? */
1411         memcpy(other + len - 8, "/refs", 6);
1412         if (!is_directory(other))
1413                 goto out;
1414         other[len - 8] = '\0';
1415         remote = remote_get(other);
1416         transport = transport_get(remote, other);
1417         for (extra = transport_get_remote_refs(transport);
1418              extra;
1419              extra = extra->next)
1420                 cb->fn(extra, cb->data);
1421         transport_disconnect(transport);
1422 out:
1423         free(other);
1424         return 0;
1425 }
1426
1427 void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1428 {
1429         struct alternate_refs_data cb;
1430         cb.fn = fn;
1431         cb.data = data;
1432         foreach_alt_odb(refs_from_alternate_cb, &cb);
1433 }