Merge branch 'dm/maint-docco'
[git] / transport.c
1 #include "cache.h"
2 #include "transport.h"
3 #include "run-command.h"
4 #ifndef NO_CURL
5 #include "http.h"
6 #endif
7 #include "pkt-line.h"
8 #include "fetch-pack.h"
9 #include "send-pack.h"
10 #include "walker.h"
11 #include "bundle.h"
12 #include "dir.h"
13 #include "refs.h"
14
15 /* rsync support */
16
17 /*
18  * We copy packed-refs and refs/ into a temporary file, then read the
19  * loose refs recursively (sorting whenever possible), and then inserting
20  * those packed refs that are not yet in the list (not validating, but
21  * assuming that the file is sorted).
22  *
23  * Appears refactoring this from refs.c is too cumbersome.
24  */
25
26 static int str_cmp(const void *a, const void *b)
27 {
28         const char *s1 = a;
29         const char *s2 = b;
30
31         return strcmp(s1, s2);
32 }
33
34 /* path->buf + name_offset is expected to point to "refs/" */
35
36 static int read_loose_refs(struct strbuf *path, int name_offset,
37                 struct ref **tail)
38 {
39         DIR *dir = opendir(path->buf);
40         struct dirent *de;
41         struct {
42                 char **entries;
43                 int nr, alloc;
44         } list;
45         int i, pathlen;
46
47         if (!dir)
48                 return -1;
49
50         memset (&list, 0, sizeof(list));
51
52         while ((de = readdir(dir))) {
53                 if (is_dot_or_dotdot(de->d_name))
54                         continue;
55                 ALLOC_GROW(list.entries, list.nr + 1, list.alloc);
56                 list.entries[list.nr++] = xstrdup(de->d_name);
57         }
58         closedir(dir);
59
60         /* sort the list */
61
62         qsort(list.entries, list.nr, sizeof(char *), str_cmp);
63
64         pathlen = path->len;
65         strbuf_addch(path, '/');
66
67         for (i = 0; i < list.nr; i++, strbuf_setlen(path, pathlen + 1)) {
68                 strbuf_addstr(path, list.entries[i]);
69                 if (read_loose_refs(path, name_offset, tail)) {
70                         int fd = open(path->buf, O_RDONLY);
71                         char buffer[40];
72                         struct ref *next;
73
74                         if (fd < 0)
75                                 continue;
76                         next = alloc_ref(path->buf + name_offset);
77                         if (read_in_full(fd, buffer, 40) != 40 ||
78                                         get_sha1_hex(buffer, next->old_sha1)) {
79                                 close(fd);
80                                 free(next);
81                                 continue;
82                         }
83                         close(fd);
84                         (*tail)->next = next;
85                         *tail = next;
86                 }
87         }
88         strbuf_setlen(path, pathlen);
89
90         for (i = 0; i < list.nr; i++)
91                 free(list.entries[i]);
92         free(list.entries);
93
94         return 0;
95 }
96
97 /* insert the packed refs for which no loose refs were found */
98
99 static void insert_packed_refs(const char *packed_refs, struct ref **list)
100 {
101         FILE *f = fopen(packed_refs, "r");
102         static char buffer[PATH_MAX];
103
104         if (!f)
105                 return;
106
107         for (;;) {
108                 int cmp = cmp, len;
109
110                 if (!fgets(buffer, sizeof(buffer), f)) {
111                         fclose(f);
112                         return;
113                 }
114
115                 if (hexval(buffer[0]) > 0xf)
116                         continue;
117                 len = strlen(buffer);
118                 if (len && buffer[len - 1] == '\n')
119                         buffer[--len] = '\0';
120                 if (len < 41)
121                         continue;
122                 while ((*list)->next &&
123                                 (cmp = strcmp(buffer + 41,
124                                       (*list)->next->name)) > 0)
125                         list = &(*list)->next;
126                 if (!(*list)->next || cmp < 0) {
127                         struct ref *next = alloc_ref(buffer + 41);
128                         buffer[40] = '\0';
129                         if (get_sha1_hex(buffer, next->old_sha1)) {
130                                 warning ("invalid SHA-1: %s", buffer);
131                                 free(next);
132                                 continue;
133                         }
134                         next->next = (*list)->next;
135                         (*list)->next = next;
136                         list = &(*list)->next;
137                 }
138         }
139 }
140
141 static const char *rsync_url(const char *url)
142 {
143         return prefixcmp(url, "rsync://") ? skip_prefix(url, "rsync:") : url;
144 }
145
146 static struct ref *get_refs_via_rsync(struct transport *transport)
147 {
148         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
149         struct ref dummy, *tail = &dummy;
150         struct child_process rsync;
151         const char *args[5];
152         int temp_dir_len;
153
154         /* copy the refs to the temporary directory */
155
156         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
157         if (!mkdtemp(temp_dir.buf))
158                 die ("Could not make temporary directory");
159         temp_dir_len = temp_dir.len;
160
161         strbuf_addstr(&buf, rsync_url(transport->url));
162         strbuf_addstr(&buf, "/refs");
163
164         memset(&rsync, 0, sizeof(rsync));
165         rsync.argv = args;
166         rsync.stdout_to_stderr = 1;
167         args[0] = "rsync";
168         args[1] = (transport->verbose > 0) ? "-rv" : "-r";
169         args[2] = buf.buf;
170         args[3] = temp_dir.buf;
171         args[4] = NULL;
172
173         if (run_command(&rsync))
174                 die ("Could not run rsync to get refs");
175
176         strbuf_reset(&buf);
177         strbuf_addstr(&buf, rsync_url(transport->url));
178         strbuf_addstr(&buf, "/packed-refs");
179
180         args[2] = buf.buf;
181
182         if (run_command(&rsync))
183                 die ("Could not run rsync to get refs");
184
185         /* read the copied refs */
186
187         strbuf_addstr(&temp_dir, "/refs");
188         read_loose_refs(&temp_dir, temp_dir_len + 1, &tail);
189         strbuf_setlen(&temp_dir, temp_dir_len);
190
191         tail = &dummy;
192         strbuf_addstr(&temp_dir, "/packed-refs");
193         insert_packed_refs(temp_dir.buf, &tail);
194         strbuf_setlen(&temp_dir, temp_dir_len);
195
196         if (remove_dir_recursively(&temp_dir, 0))
197                 warning ("Error removing temporary directory %s.",
198                                 temp_dir.buf);
199
200         strbuf_release(&buf);
201         strbuf_release(&temp_dir);
202
203         return dummy.next;
204 }
205
206 static int fetch_objs_via_rsync(struct transport *transport,
207                                 int nr_objs, const struct ref **to_fetch)
208 {
209         struct strbuf buf = STRBUF_INIT;
210         struct child_process rsync;
211         const char *args[8];
212         int result;
213
214         strbuf_addstr(&buf, rsync_url(transport->url));
215         strbuf_addstr(&buf, "/objects/");
216
217         memset(&rsync, 0, sizeof(rsync));
218         rsync.argv = args;
219         rsync.stdout_to_stderr = 1;
220         args[0] = "rsync";
221         args[1] = (transport->verbose > 0) ? "-rv" : "-r";
222         args[2] = "--ignore-existing";
223         args[3] = "--exclude";
224         args[4] = "info";
225         args[5] = buf.buf;
226         args[6] = get_object_directory();
227         args[7] = NULL;
228
229         /* NEEDSWORK: handle one level of alternates */
230         result = run_command(&rsync);
231
232         strbuf_release(&buf);
233
234         return result;
235 }
236
237 static int write_one_ref(const char *name, const unsigned char *sha1,
238                 int flags, void *data)
239 {
240         struct strbuf *buf = data;
241         int len = buf->len;
242         FILE *f;
243
244         /* when called via for_each_ref(), flags is non-zero */
245         if (flags && prefixcmp(name, "refs/heads/") &&
246                         prefixcmp(name, "refs/tags/"))
247                 return 0;
248
249         strbuf_addstr(buf, name);
250         if (safe_create_leading_directories(buf->buf) ||
251                         !(f = fopen(buf->buf, "w")) ||
252                         fprintf(f, "%s\n", sha1_to_hex(sha1)) < 0 ||
253                         fclose(f))
254                 return error("problems writing temporary file %s", buf->buf);
255         strbuf_setlen(buf, len);
256         return 0;
257 }
258
259 static int write_refs_to_temp_dir(struct strbuf *temp_dir,
260                 int refspec_nr, const char **refspec)
261 {
262         int i;
263
264         for (i = 0; i < refspec_nr; i++) {
265                 unsigned char sha1[20];
266                 char *ref;
267
268                 if (dwim_ref(refspec[i], strlen(refspec[i]), sha1, &ref) != 1)
269                         return error("Could not get ref %s", refspec[i]);
270
271                 if (write_one_ref(ref, sha1, 0, temp_dir)) {
272                         free(ref);
273                         return -1;
274                 }
275                 free(ref);
276         }
277         return 0;
278 }
279
280 static int rsync_transport_push(struct transport *transport,
281                 int refspec_nr, const char **refspec, int flags)
282 {
283         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
284         int result = 0, i;
285         struct child_process rsync;
286         const char *args[10];
287
288         if (flags & TRANSPORT_PUSH_MIRROR)
289                 return error("rsync transport does not support mirror mode");
290
291         /* first push the objects */
292
293         strbuf_addstr(&buf, rsync_url(transport->url));
294         strbuf_addch(&buf, '/');
295
296         memset(&rsync, 0, sizeof(rsync));
297         rsync.argv = args;
298         rsync.stdout_to_stderr = 1;
299         i = 0;
300         args[i++] = "rsync";
301         args[i++] = "-a";
302         if (flags & TRANSPORT_PUSH_DRY_RUN)
303                 args[i++] = "--dry-run";
304         if (transport->verbose > 0)
305                 args[i++] = "-v";
306         args[i++] = "--ignore-existing";
307         args[i++] = "--exclude";
308         args[i++] = "info";
309         args[i++] = get_object_directory();
310         args[i++] = buf.buf;
311         args[i++] = NULL;
312
313         if (run_command(&rsync))
314                 return error("Could not push objects to %s",
315                                 rsync_url(transport->url));
316
317         /* copy the refs to the temporary directory; they could be packed. */
318
319         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
320         if (!mkdtemp(temp_dir.buf))
321                 die ("Could not make temporary directory");
322         strbuf_addch(&temp_dir, '/');
323
324         if (flags & TRANSPORT_PUSH_ALL) {
325                 if (for_each_ref(write_one_ref, &temp_dir))
326                         return -1;
327         } else if (write_refs_to_temp_dir(&temp_dir, refspec_nr, refspec))
328                 return -1;
329
330         i = 2;
331         if (flags & TRANSPORT_PUSH_DRY_RUN)
332                 args[i++] = "--dry-run";
333         if (!(flags & TRANSPORT_PUSH_FORCE))
334                 args[i++] = "--ignore-existing";
335         args[i++] = temp_dir.buf;
336         args[i++] = rsync_url(transport->url);
337         args[i++] = NULL;
338         if (run_command(&rsync))
339                 result = error("Could not push to %s",
340                                 rsync_url(transport->url));
341
342         if (remove_dir_recursively(&temp_dir, 0))
343                 warning ("Could not remove temporary directory %s.",
344                                 temp_dir.buf);
345
346         strbuf_release(&buf);
347         strbuf_release(&temp_dir);
348
349         return result;
350 }
351
352 /* Generic functions for using commit walkers */
353
354 #ifndef NO_CURL /* http fetch is the only user */
355 static int fetch_objs_via_walker(struct transport *transport,
356                                  int nr_objs, const struct ref **to_fetch)
357 {
358         char *dest = xstrdup(transport->url);
359         struct walker *walker = transport->data;
360         char **objs = xmalloc(nr_objs * sizeof(*objs));
361         int i;
362
363         walker->get_all = 1;
364         walker->get_tree = 1;
365         walker->get_history = 1;
366         walker->get_verbosely = transport->verbose >= 0;
367         walker->get_recover = 0;
368
369         for (i = 0; i < nr_objs; i++)
370                 objs[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
371
372         if (walker_fetch(walker, nr_objs, objs, NULL, NULL))
373                 die("Fetch failed.");
374
375         for (i = 0; i < nr_objs; i++)
376                 free(objs[i]);
377         free(objs);
378         free(dest);
379         return 0;
380 }
381 #endif /* NO_CURL */
382
383 static int disconnect_walker(struct transport *transport)
384 {
385         struct walker *walker = transport->data;
386         if (walker)
387                 walker_free(walker);
388         return 0;
389 }
390
391 #ifndef NO_CURL
392 static int curl_transport_push(struct transport *transport, int refspec_nr, const char **refspec, int flags)
393 {
394         const char **argv;
395         int argc;
396         int err;
397
398         if (flags & TRANSPORT_PUSH_MIRROR)
399                 return error("http transport does not support mirror mode");
400
401         argv = xmalloc((refspec_nr + 12) * sizeof(char *));
402         argv[0] = "http-push";
403         argc = 1;
404         if (flags & TRANSPORT_PUSH_ALL)
405                 argv[argc++] = "--all";
406         if (flags & TRANSPORT_PUSH_FORCE)
407                 argv[argc++] = "--force";
408         if (flags & TRANSPORT_PUSH_DRY_RUN)
409                 argv[argc++] = "--dry-run";
410         if (flags & TRANSPORT_PUSH_VERBOSE)
411                 argv[argc++] = "--verbose";
412         argv[argc++] = transport->url;
413         while (refspec_nr--)
414                 argv[argc++] = *refspec++;
415         argv[argc] = NULL;
416         err = run_command_v_opt(argv, RUN_GIT_CMD);
417         switch (err) {
418         case -ERR_RUN_COMMAND_FORK:
419                 error("unable to fork for %s", argv[0]);
420         case -ERR_RUN_COMMAND_EXEC:
421                 error("unable to exec %s", argv[0]);
422                 break;
423         case -ERR_RUN_COMMAND_WAITPID:
424         case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
425         case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
426         case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
427                 error("%s died with strange error", argv[0]);
428         }
429         return !!err;
430 }
431
432 static struct ref *get_refs_via_curl(struct transport *transport)
433 {
434         struct strbuf buffer = STRBUF_INIT;
435         char *data, *start, *mid;
436         char *ref_name;
437         char *refs_url;
438         int i = 0;
439
440         struct active_request_slot *slot;
441         struct slot_results results;
442
443         struct ref *refs = NULL;
444         struct ref *ref = NULL;
445         struct ref *last_ref = NULL;
446
447         struct walker *walker;
448
449         if (!transport->data)
450                 transport->data = get_http_walker(transport->url,
451                                                 transport->remote);
452
453         walker = transport->data;
454
455         refs_url = xmalloc(strlen(transport->url) + 11);
456         sprintf(refs_url, "%s/info/refs", transport->url);
457
458         slot = get_active_slot();
459         slot->results = &results;
460         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
461         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
462         curl_easy_setopt(slot->curl, CURLOPT_URL, refs_url);
463         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
464
465         if (start_active_slot(slot)) {
466                 run_active_slot(slot);
467                 if (results.curl_result != CURLE_OK) {
468                         strbuf_release(&buffer);
469                         if (missing_target(&results))
470                                 die("%s not found: did you run git update-server-info on the server?", refs_url);
471                         else
472                                 die("%s download error - %s", refs_url, curl_errorstr);
473                 }
474         } else {
475                 strbuf_release(&buffer);
476                 die("Unable to start HTTP request");
477         }
478
479         data = buffer.buf;
480         start = NULL;
481         mid = data;
482         while (i < buffer.len) {
483                 if (!start)
484                         start = &data[i];
485                 if (data[i] == '\t')
486                         mid = &data[i];
487                 if (data[i] == '\n') {
488                         data[i] = 0;
489                         ref_name = mid + 1;
490                         ref = xmalloc(sizeof(struct ref) +
491                                       strlen(ref_name) + 1);
492                         memset(ref, 0, sizeof(struct ref));
493                         strcpy(ref->name, ref_name);
494                         get_sha1_hex(start, ref->old_sha1);
495                         if (!refs)
496                                 refs = ref;
497                         if (last_ref)
498                                 last_ref->next = ref;
499                         last_ref = ref;
500                         start = NULL;
501                 }
502                 i++;
503         }
504
505         strbuf_release(&buffer);
506
507         ref = alloc_ref("HEAD");
508         if (!walker->fetch_ref(walker, ref) &&
509             !resolve_remote_symref(ref, refs)) {
510                 ref->next = refs;
511                 refs = ref;
512         } else {
513                 free(ref);
514         }
515
516         return refs;
517 }
518
519 static int fetch_objs_via_curl(struct transport *transport,
520                                  int nr_objs, const struct ref **to_fetch)
521 {
522         if (!transport->data)
523                 transport->data = get_http_walker(transport->url,
524                                                 transport->remote);
525         return fetch_objs_via_walker(transport, nr_objs, to_fetch);
526 }
527
528 #endif
529
530 struct bundle_transport_data {
531         int fd;
532         struct bundle_header header;
533 };
534
535 static struct ref *get_refs_from_bundle(struct transport *transport)
536 {
537         struct bundle_transport_data *data = transport->data;
538         struct ref *result = NULL;
539         int i;
540
541         if (data->fd > 0)
542                 close(data->fd);
543         data->fd = read_bundle_header(transport->url, &data->header);
544         if (data->fd < 0)
545                 die ("Could not read bundle '%s'.", transport->url);
546         for (i = 0; i < data->header.references.nr; i++) {
547                 struct ref_list_entry *e = data->header.references.list + i;
548                 struct ref *ref = alloc_ref(e->name);
549                 hashcpy(ref->old_sha1, e->sha1);
550                 ref->next = result;
551                 result = ref;
552         }
553         return result;
554 }
555
556 static int fetch_refs_from_bundle(struct transport *transport,
557                                int nr_heads, const struct ref **to_fetch)
558 {
559         struct bundle_transport_data *data = transport->data;
560         return unbundle(&data->header, data->fd);
561 }
562
563 static int close_bundle(struct transport *transport)
564 {
565         struct bundle_transport_data *data = transport->data;
566         if (data->fd > 0)
567                 close(data->fd);
568         free(data);
569         return 0;
570 }
571
572 struct git_transport_data {
573         unsigned thin : 1;
574         unsigned keep : 1;
575         unsigned followtags : 1;
576         int depth;
577         struct child_process *conn;
578         int fd[2];
579         const char *uploadpack;
580         const char *receivepack;
581 };
582
583 static int set_git_option(struct transport *connection,
584                           const char *name, const char *value)
585 {
586         struct git_transport_data *data = connection->data;
587         if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
588                 data->uploadpack = value;
589                 return 0;
590         } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
591                 data->receivepack = value;
592                 return 0;
593         } else if (!strcmp(name, TRANS_OPT_THIN)) {
594                 data->thin = !!value;
595                 return 0;
596         } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
597                 data->followtags = !!value;
598                 return 0;
599         } else if (!strcmp(name, TRANS_OPT_KEEP)) {
600                 data->keep = !!value;
601                 return 0;
602         } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
603                 if (!value)
604                         data->depth = 0;
605                 else
606                         data->depth = atoi(value);
607                 return 0;
608         }
609         return 1;
610 }
611
612 static int connect_setup(struct transport *transport)
613 {
614         struct git_transport_data *data = transport->data;
615         data->conn = git_connect(data->fd, transport->url, data->uploadpack, 0);
616         return 0;
617 }
618
619 static struct ref *get_refs_via_connect(struct transport *transport)
620 {
621         struct git_transport_data *data = transport->data;
622         struct ref *refs;
623
624         connect_setup(transport);
625         get_remote_heads(data->fd[0], &refs, 0, NULL, 0, NULL);
626
627         return refs;
628 }
629
630 static int fetch_refs_via_pack(struct transport *transport,
631                                int nr_heads, const struct ref **to_fetch)
632 {
633         struct git_transport_data *data = transport->data;
634         char **heads = xmalloc(nr_heads * sizeof(*heads));
635         char **origh = xmalloc(nr_heads * sizeof(*origh));
636         const struct ref *refs;
637         char *dest = xstrdup(transport->url);
638         struct fetch_pack_args args;
639         int i;
640         struct ref *refs_tmp = NULL;
641
642         memset(&args, 0, sizeof(args));
643         args.uploadpack = data->uploadpack;
644         args.keep_pack = data->keep;
645         args.lock_pack = 1;
646         args.use_thin_pack = data->thin;
647         args.include_tag = data->followtags;
648         args.verbose = (transport->verbose > 0);
649         args.quiet = (transport->verbose < 0);
650         args.no_progress = args.quiet || (!transport->progress && !isatty(1));
651         args.depth = data->depth;
652
653         for (i = 0; i < nr_heads; i++)
654                 origh[i] = heads[i] = xstrdup(to_fetch[i]->name);
655
656         if (!data->conn) {
657                 connect_setup(transport);
658                 get_remote_heads(data->fd[0], &refs_tmp, 0, NULL, 0, NULL);
659         }
660
661         refs = fetch_pack(&args, data->fd, data->conn,
662                           refs_tmp ? refs_tmp : transport->remote_refs,
663                           dest, nr_heads, heads, &transport->pack_lockfile);
664         close(data->fd[0]);
665         close(data->fd[1]);
666         if (finish_connect(data->conn))
667                 refs = NULL;
668         data->conn = NULL;
669
670         free_refs(refs_tmp);
671
672         for (i = 0; i < nr_heads; i++)
673                 free(origh[i]);
674         free(origh);
675         free(heads);
676         free(dest);
677         return (refs ? 0 : -1);
678 }
679
680 static int git_transport_push(struct transport *transport, int refspec_nr, const char **refspec, int flags)
681 {
682         struct git_transport_data *data = transport->data;
683         struct send_pack_args args;
684
685         args.receivepack = data->receivepack;
686         args.send_all = !!(flags & TRANSPORT_PUSH_ALL);
687         args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
688         args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
689         args.use_thin_pack = data->thin;
690         args.verbose = !!(flags & TRANSPORT_PUSH_VERBOSE);
691         args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
692
693         return send_pack(&args, transport->url, transport->remote, refspec_nr, refspec);
694 }
695
696 static int disconnect_git(struct transport *transport)
697 {
698         struct git_transport_data *data = transport->data;
699         if (data->conn) {
700                 packet_flush(data->fd[1]);
701                 close(data->fd[0]);
702                 close(data->fd[1]);
703                 finish_connect(data->conn);
704         }
705
706         free(data);
707         return 0;
708 }
709
710 static int is_local(const char *url)
711 {
712         const char *colon = strchr(url, ':');
713         const char *slash = strchr(url, '/');
714         return !colon || (slash && slash < colon) ||
715                 has_dos_drive_prefix(url);
716 }
717
718 static int is_file(const char *url)
719 {
720         struct stat buf;
721         if (stat(url, &buf))
722                 return 0;
723         return S_ISREG(buf.st_mode);
724 }
725
726 struct transport *transport_get(struct remote *remote, const char *url)
727 {
728         struct transport *ret = xcalloc(1, sizeof(*ret));
729
730         ret->remote = remote;
731         ret->url = url;
732
733         if (!prefixcmp(url, "rsync:")) {
734                 ret->get_refs_list = get_refs_via_rsync;
735                 ret->fetch = fetch_objs_via_rsync;
736                 ret->push = rsync_transport_push;
737
738         } else if (!prefixcmp(url, "http://")
739                 || !prefixcmp(url, "https://")
740                 || !prefixcmp(url, "ftp://")) {
741 #ifdef NO_CURL
742                 error("git was compiled without libcurl support.");
743 #else
744                 ret->get_refs_list = get_refs_via_curl;
745                 ret->fetch = fetch_objs_via_curl;
746                 ret->push = curl_transport_push;
747 #endif
748                 ret->disconnect = disconnect_walker;
749
750         } else if (is_local(url) && is_file(url)) {
751                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
752                 ret->data = data;
753                 ret->get_refs_list = get_refs_from_bundle;
754                 ret->fetch = fetch_refs_from_bundle;
755                 ret->disconnect = close_bundle;
756
757         } else {
758                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
759                 ret->data = data;
760                 ret->set_option = set_git_option;
761                 ret->get_refs_list = get_refs_via_connect;
762                 ret->fetch = fetch_refs_via_pack;
763                 ret->push = git_transport_push;
764                 ret->disconnect = disconnect_git;
765
766                 data->thin = 1;
767                 data->conn = NULL;
768                 data->uploadpack = "git-upload-pack";
769                 if (remote && remote->uploadpack)
770                         data->uploadpack = remote->uploadpack;
771                 data->receivepack = "git-receive-pack";
772                 if (remote && remote->receivepack)
773                         data->receivepack = remote->receivepack;
774         }
775
776         return ret;
777 }
778
779 int transport_set_option(struct transport *transport,
780                          const char *name, const char *value)
781 {
782         if (transport->set_option)
783                 return transport->set_option(transport, name, value);
784         return 1;
785 }
786
787 int transport_push(struct transport *transport,
788                    int refspec_nr, const char **refspec, int flags)
789 {
790         if (!transport->push)
791                 return 1;
792         return transport->push(transport, refspec_nr, refspec, flags);
793 }
794
795 const struct ref *transport_get_remote_refs(struct transport *transport)
796 {
797         if (!transport->remote_refs)
798                 transport->remote_refs = transport->get_refs_list(transport);
799         return transport->remote_refs;
800 }
801
802 int transport_fetch_refs(struct transport *transport, const struct ref *refs)
803 {
804         int rc;
805         int nr_heads = 0, nr_alloc = 0;
806         const struct ref **heads = NULL;
807         const struct ref *rm;
808
809         for (rm = refs; rm; rm = rm->next) {
810                 if (rm->peer_ref &&
811                     !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
812                         continue;
813                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
814                 heads[nr_heads++] = rm;
815         }
816
817         rc = transport->fetch(transport, nr_heads, heads);
818         free(heads);
819         return rc;
820 }
821
822 void transport_unlock_pack(struct transport *transport)
823 {
824         if (transport->pack_lockfile) {
825                 unlink(transport->pack_lockfile);
826                 free(transport->pack_lockfile);
827                 transport->pack_lockfile = NULL;
828         }
829 }
830
831 int transport_disconnect(struct transport *transport)
832 {
833         int ret = 0;
834         if (transport->disconnect)
835                 ret = transport->disconnect(transport);
836         free(transport);
837         return ret;
838 }