Merge branch 'cc/maint-1.6.0-bisect-fix'
[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 struct ref *get_refs_via_rsync(struct transport *transport)
142 {
143         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
144         struct ref dummy, *tail = &dummy;
145         struct child_process rsync;
146         const char *args[5];
147         int temp_dir_len;
148
149         /* copy the refs to the temporary directory */
150
151         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
152         if (!mkdtemp(temp_dir.buf))
153                 die ("Could not make temporary directory");
154         temp_dir_len = temp_dir.len;
155
156         strbuf_addstr(&buf, transport->url);
157         strbuf_addstr(&buf, "/refs");
158
159         memset(&rsync, 0, sizeof(rsync));
160         rsync.argv = args;
161         rsync.stdout_to_stderr = 1;
162         args[0] = "rsync";
163         args[1] = (transport->verbose > 0) ? "-rv" : "-r";
164         args[2] = buf.buf;
165         args[3] = temp_dir.buf;
166         args[4] = NULL;
167
168         if (run_command(&rsync))
169                 die ("Could not run rsync to get refs");
170
171         strbuf_reset(&buf);
172         strbuf_addstr(&buf, transport->url);
173         strbuf_addstr(&buf, "/packed-refs");
174
175         args[2] = buf.buf;
176
177         if (run_command(&rsync))
178                 die ("Could not run rsync to get refs");
179
180         /* read the copied refs */
181
182         strbuf_addstr(&temp_dir, "/refs");
183         read_loose_refs(&temp_dir, temp_dir_len + 1, &tail);
184         strbuf_setlen(&temp_dir, temp_dir_len);
185
186         tail = &dummy;
187         strbuf_addstr(&temp_dir, "/packed-refs");
188         insert_packed_refs(temp_dir.buf, &tail);
189         strbuf_setlen(&temp_dir, temp_dir_len);
190
191         if (remove_dir_recursively(&temp_dir, 0))
192                 warning ("Error removing temporary directory %s.",
193                                 temp_dir.buf);
194
195         strbuf_release(&buf);
196         strbuf_release(&temp_dir);
197
198         return dummy.next;
199 }
200
201 static int fetch_objs_via_rsync(struct transport *transport,
202                                 int nr_objs, const struct ref **to_fetch)
203 {
204         struct strbuf buf = STRBUF_INIT;
205         struct child_process rsync;
206         const char *args[8];
207         int result;
208
209         strbuf_addstr(&buf, transport->url);
210         strbuf_addstr(&buf, "/objects/");
211
212         memset(&rsync, 0, sizeof(rsync));
213         rsync.argv = args;
214         rsync.stdout_to_stderr = 1;
215         args[0] = "rsync";
216         args[1] = (transport->verbose > 0) ? "-rv" : "-r";
217         args[2] = "--ignore-existing";
218         args[3] = "--exclude";
219         args[4] = "info";
220         args[5] = buf.buf;
221         args[6] = get_object_directory();
222         args[7] = NULL;
223
224         /* NEEDSWORK: handle one level of alternates */
225         result = run_command(&rsync);
226
227         strbuf_release(&buf);
228
229         return result;
230 }
231
232 static int write_one_ref(const char *name, const unsigned char *sha1,
233                 int flags, void *data)
234 {
235         struct strbuf *buf = data;
236         int len = buf->len;
237         FILE *f;
238
239         /* when called via for_each_ref(), flags is non-zero */
240         if (flags && prefixcmp(name, "refs/heads/") &&
241                         prefixcmp(name, "refs/tags/"))
242                 return 0;
243
244         strbuf_addstr(buf, name);
245         if (safe_create_leading_directories(buf->buf) ||
246                         !(f = fopen(buf->buf, "w")) ||
247                         fprintf(f, "%s\n", sha1_to_hex(sha1)) < 0 ||
248                         fclose(f))
249                 return error("problems writing temporary file %s", buf->buf);
250         strbuf_setlen(buf, len);
251         return 0;
252 }
253
254 static int write_refs_to_temp_dir(struct strbuf *temp_dir,
255                 int refspec_nr, const char **refspec)
256 {
257         int i;
258
259         for (i = 0; i < refspec_nr; i++) {
260                 unsigned char sha1[20];
261                 char *ref;
262
263                 if (dwim_ref(refspec[i], strlen(refspec[i]), sha1, &ref) != 1)
264                         return error("Could not get ref %s", refspec[i]);
265
266                 if (write_one_ref(ref, sha1, 0, temp_dir)) {
267                         free(ref);
268                         return -1;
269                 }
270                 free(ref);
271         }
272         return 0;
273 }
274
275 static int rsync_transport_push(struct transport *transport,
276                 int refspec_nr, const char **refspec, int flags)
277 {
278         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
279         int result = 0, i;
280         struct child_process rsync;
281         const char *args[10];
282
283         if (flags & TRANSPORT_PUSH_MIRROR)
284                 return error("rsync transport does not support mirror mode");
285
286         /* first push the objects */
287
288         strbuf_addstr(&buf, transport->url);
289         strbuf_addch(&buf, '/');
290
291         memset(&rsync, 0, sizeof(rsync));
292         rsync.argv = args;
293         rsync.stdout_to_stderr = 1;
294         i = 0;
295         args[i++] = "rsync";
296         args[i++] = "-a";
297         if (flags & TRANSPORT_PUSH_DRY_RUN)
298                 args[i++] = "--dry-run";
299         if (transport->verbose > 0)
300                 args[i++] = "-v";
301         args[i++] = "--ignore-existing";
302         args[i++] = "--exclude";
303         args[i++] = "info";
304         args[i++] = get_object_directory();
305         args[i++] = buf.buf;
306         args[i++] = NULL;
307
308         if (run_command(&rsync))
309                 return error("Could not push objects to %s", transport->url);
310
311         /* copy the refs to the temporary directory; they could be packed. */
312
313         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
314         if (!mkdtemp(temp_dir.buf))
315                 die ("Could not make temporary directory");
316         strbuf_addch(&temp_dir, '/');
317
318         if (flags & TRANSPORT_PUSH_ALL) {
319                 if (for_each_ref(write_one_ref, &temp_dir))
320                         return -1;
321         } else if (write_refs_to_temp_dir(&temp_dir, refspec_nr, refspec))
322                 return -1;
323
324         i = 2;
325         if (flags & TRANSPORT_PUSH_DRY_RUN)
326                 args[i++] = "--dry-run";
327         if (!(flags & TRANSPORT_PUSH_FORCE))
328                 args[i++] = "--ignore-existing";
329         args[i++] = temp_dir.buf;
330         args[i++] = transport->url;
331         args[i++] = NULL;
332         if (run_command(&rsync))
333                 result = error("Could not push to %s", transport->url);
334
335         if (remove_dir_recursively(&temp_dir, 0))
336                 warning ("Could not remove temporary directory %s.",
337                                 temp_dir.buf);
338
339         strbuf_release(&buf);
340         strbuf_release(&temp_dir);
341
342         return result;
343 }
344
345 /* Generic functions for using commit walkers */
346
347 #ifndef NO_CURL /* http fetch is the only user */
348 static int fetch_objs_via_walker(struct transport *transport,
349                                  int nr_objs, const struct ref **to_fetch)
350 {
351         char *dest = xstrdup(transport->url);
352         struct walker *walker = transport->data;
353         char **objs = xmalloc(nr_objs * sizeof(*objs));
354         int i;
355
356         walker->get_all = 1;
357         walker->get_tree = 1;
358         walker->get_history = 1;
359         walker->get_verbosely = transport->verbose >= 0;
360         walker->get_recover = 0;
361
362         for (i = 0; i < nr_objs; i++)
363                 objs[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
364
365         if (walker_fetch(walker, nr_objs, objs, NULL, NULL))
366                 die("Fetch failed.");
367
368         for (i = 0; i < nr_objs; i++)
369                 free(objs[i]);
370         free(objs);
371         free(dest);
372         return 0;
373 }
374 #endif /* NO_CURL */
375
376 static int disconnect_walker(struct transport *transport)
377 {
378         struct walker *walker = transport->data;
379         if (walker)
380                 walker_free(walker);
381         return 0;
382 }
383
384 #ifndef NO_CURL
385 static int curl_transport_push(struct transport *transport, int refspec_nr, const char **refspec, int flags)
386 {
387         const char **argv;
388         int argc;
389         int err;
390
391         if (flags & TRANSPORT_PUSH_MIRROR)
392                 return error("http transport does not support mirror mode");
393
394         argv = xmalloc((refspec_nr + 12) * sizeof(char *));
395         argv[0] = "http-push";
396         argc = 1;
397         if (flags & TRANSPORT_PUSH_ALL)
398                 argv[argc++] = "--all";
399         if (flags & TRANSPORT_PUSH_FORCE)
400                 argv[argc++] = "--force";
401         if (flags & TRANSPORT_PUSH_DRY_RUN)
402                 argv[argc++] = "--dry-run";
403         if (flags & TRANSPORT_PUSH_VERBOSE)
404                 argv[argc++] = "--verbose";
405         argv[argc++] = transport->url;
406         while (refspec_nr--)
407                 argv[argc++] = *refspec++;
408         argv[argc] = NULL;
409         err = run_command_v_opt(argv, RUN_GIT_CMD);
410         switch (err) {
411         case -ERR_RUN_COMMAND_FORK:
412                 error("unable to fork for %s", argv[0]);
413         case -ERR_RUN_COMMAND_EXEC:
414                 error("unable to exec %s", argv[0]);
415                 break;
416         case -ERR_RUN_COMMAND_WAITPID:
417         case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
418         case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
419         case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
420                 error("%s died with strange error", argv[0]);
421         }
422         return !!err;
423 }
424
425 static struct ref *get_refs_via_curl(struct transport *transport)
426 {
427         struct strbuf buffer = STRBUF_INIT;
428         char *data, *start, *mid;
429         char *ref_name;
430         char *refs_url;
431         int i = 0;
432
433         struct active_request_slot *slot;
434         struct slot_results results;
435
436         struct ref *refs = NULL;
437         struct ref *ref = NULL;
438         struct ref *last_ref = NULL;
439
440         struct walker *walker;
441
442         if (!transport->data)
443                 transport->data = get_http_walker(transport->url,
444                                                 transport->remote);
445
446         walker = transport->data;
447
448         refs_url = xmalloc(strlen(transport->url) + 11);
449         sprintf(refs_url, "%s/info/refs", transport->url);
450
451         slot = get_active_slot();
452         slot->results = &results;
453         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
454         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
455         curl_easy_setopt(slot->curl, CURLOPT_URL, refs_url);
456         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
457
458         if (start_active_slot(slot)) {
459                 run_active_slot(slot);
460                 if (results.curl_result != CURLE_OK) {
461                         strbuf_release(&buffer);
462                         if (missing_target(&results))
463                                 die("%s not found: did you run git update-server-info on the server?", refs_url);
464                         else
465                                 die("%s download error - %s", refs_url, curl_errorstr);
466                 }
467         } else {
468                 strbuf_release(&buffer);
469                 die("Unable to start HTTP request");
470         }
471
472         data = buffer.buf;
473         start = NULL;
474         mid = data;
475         while (i < buffer.len) {
476                 if (!start)
477                         start = &data[i];
478                 if (data[i] == '\t')
479                         mid = &data[i];
480                 if (data[i] == '\n') {
481                         data[i] = 0;
482                         ref_name = mid + 1;
483                         ref = xmalloc(sizeof(struct ref) +
484                                       strlen(ref_name) + 1);
485                         memset(ref, 0, sizeof(struct ref));
486                         strcpy(ref->name, ref_name);
487                         get_sha1_hex(start, ref->old_sha1);
488                         if (!refs)
489                                 refs = ref;
490                         if (last_ref)
491                                 last_ref->next = ref;
492                         last_ref = ref;
493                         start = NULL;
494                 }
495                 i++;
496         }
497
498         strbuf_release(&buffer);
499
500         ref = alloc_ref("HEAD");
501         if (!walker->fetch_ref(walker, ref) &&
502             !resolve_remote_symref(ref, refs)) {
503                 ref->next = refs;
504                 refs = ref;
505         } else {
506                 free(ref);
507         }
508
509         return refs;
510 }
511
512 static int fetch_objs_via_curl(struct transport *transport,
513                                  int nr_objs, const struct ref **to_fetch)
514 {
515         if (!transport->data)
516                 transport->data = get_http_walker(transport->url,
517                                                 transport->remote);
518         return fetch_objs_via_walker(transport, nr_objs, to_fetch);
519 }
520
521 #endif
522
523 struct bundle_transport_data {
524         int fd;
525         struct bundle_header header;
526 };
527
528 static struct ref *get_refs_from_bundle(struct transport *transport)
529 {
530         struct bundle_transport_data *data = transport->data;
531         struct ref *result = NULL;
532         int i;
533
534         if (data->fd > 0)
535                 close(data->fd);
536         data->fd = read_bundle_header(transport->url, &data->header);
537         if (data->fd < 0)
538                 die ("Could not read bundle '%s'.", transport->url);
539         for (i = 0; i < data->header.references.nr; i++) {
540                 struct ref_list_entry *e = data->header.references.list + i;
541                 struct ref *ref = alloc_ref(e->name);
542                 hashcpy(ref->old_sha1, e->sha1);
543                 ref->next = result;
544                 result = ref;
545         }
546         return result;
547 }
548
549 static int fetch_refs_from_bundle(struct transport *transport,
550                                int nr_heads, const struct ref **to_fetch)
551 {
552         struct bundle_transport_data *data = transport->data;
553         return unbundle(&data->header, data->fd);
554 }
555
556 static int close_bundle(struct transport *transport)
557 {
558         struct bundle_transport_data *data = transport->data;
559         if (data->fd > 0)
560                 close(data->fd);
561         free(data);
562         return 0;
563 }
564
565 struct git_transport_data {
566         unsigned thin : 1;
567         unsigned keep : 1;
568         unsigned followtags : 1;
569         int depth;
570         struct child_process *conn;
571         int fd[2];
572         const char *uploadpack;
573         const char *receivepack;
574 };
575
576 static int set_git_option(struct transport *connection,
577                           const char *name, const char *value)
578 {
579         struct git_transport_data *data = connection->data;
580         if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
581                 data->uploadpack = value;
582                 return 0;
583         } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
584                 data->receivepack = value;
585                 return 0;
586         } else if (!strcmp(name, TRANS_OPT_THIN)) {
587                 data->thin = !!value;
588                 return 0;
589         } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
590                 data->followtags = !!value;
591                 return 0;
592         } else if (!strcmp(name, TRANS_OPT_KEEP)) {
593                 data->keep = !!value;
594                 return 0;
595         } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
596                 if (!value)
597                         data->depth = 0;
598                 else
599                         data->depth = atoi(value);
600                 return 0;
601         }
602         return 1;
603 }
604
605 static int connect_setup(struct transport *transport)
606 {
607         struct git_transport_data *data = transport->data;
608         data->conn = git_connect(data->fd, transport->url, data->uploadpack, 0);
609         return 0;
610 }
611
612 static struct ref *get_refs_via_connect(struct transport *transport)
613 {
614         struct git_transport_data *data = transport->data;
615         struct ref *refs;
616
617         connect_setup(transport);
618         get_remote_heads(data->fd[0], &refs, 0, NULL, 0, NULL);
619
620         return refs;
621 }
622
623 static int fetch_refs_via_pack(struct transport *transport,
624                                int nr_heads, const struct ref **to_fetch)
625 {
626         struct git_transport_data *data = transport->data;
627         char **heads = xmalloc(nr_heads * sizeof(*heads));
628         char **origh = xmalloc(nr_heads * sizeof(*origh));
629         const struct ref *refs;
630         char *dest = xstrdup(transport->url);
631         struct fetch_pack_args args;
632         int i;
633         struct ref *refs_tmp = NULL;
634
635         memset(&args, 0, sizeof(args));
636         args.uploadpack = data->uploadpack;
637         args.keep_pack = data->keep;
638         args.lock_pack = 1;
639         args.use_thin_pack = data->thin;
640         args.include_tag = data->followtags;
641         args.verbose = (transport->verbose > 0);
642         args.quiet = (transport->verbose < 0);
643         args.no_progress = args.quiet || (!transport->progress && !isatty(1));
644         args.depth = data->depth;
645
646         for (i = 0; i < nr_heads; i++)
647                 origh[i] = heads[i] = xstrdup(to_fetch[i]->name);
648
649         if (!data->conn) {
650                 connect_setup(transport);
651                 get_remote_heads(data->fd[0], &refs_tmp, 0, NULL, 0, NULL);
652         }
653
654         refs = fetch_pack(&args, data->fd, data->conn,
655                           refs_tmp ? refs_tmp : transport->remote_refs,
656                           dest, nr_heads, heads, &transport->pack_lockfile);
657         close(data->fd[0]);
658         close(data->fd[1]);
659         if (finish_connect(data->conn))
660                 refs = NULL;
661         data->conn = NULL;
662
663         free_refs(refs_tmp);
664
665         for (i = 0; i < nr_heads; i++)
666                 free(origh[i]);
667         free(origh);
668         free(heads);
669         free(dest);
670         return (refs ? 0 : -1);
671 }
672
673 static int git_transport_push(struct transport *transport, int refspec_nr, const char **refspec, int flags)
674 {
675         struct git_transport_data *data = transport->data;
676         struct send_pack_args args;
677
678         args.receivepack = data->receivepack;
679         args.send_all = !!(flags & TRANSPORT_PUSH_ALL);
680         args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
681         args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
682         args.use_thin_pack = data->thin;
683         args.verbose = !!(flags & TRANSPORT_PUSH_VERBOSE);
684         args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
685
686         return send_pack(&args, transport->url, transport->remote, refspec_nr, refspec);
687 }
688
689 static int disconnect_git(struct transport *transport)
690 {
691         struct git_transport_data *data = transport->data;
692         if (data->conn) {
693                 packet_flush(data->fd[1]);
694                 close(data->fd[0]);
695                 close(data->fd[1]);
696                 finish_connect(data->conn);
697         }
698
699         free(data);
700         return 0;
701 }
702
703 static int is_local(const char *url)
704 {
705         const char *colon = strchr(url, ':');
706         const char *slash = strchr(url, '/');
707         return !colon || (slash && slash < colon) ||
708                 has_dos_drive_prefix(url);
709 }
710
711 static int is_file(const char *url)
712 {
713         struct stat buf;
714         if (stat(url, &buf))
715                 return 0;
716         return S_ISREG(buf.st_mode);
717 }
718
719 struct transport *transport_get(struct remote *remote, const char *url)
720 {
721         struct transport *ret = xcalloc(1, sizeof(*ret));
722
723         ret->remote = remote;
724         ret->url = url;
725
726         if (!prefixcmp(url, "rsync://")) {
727                 ret->get_refs_list = get_refs_via_rsync;
728                 ret->fetch = fetch_objs_via_rsync;
729                 ret->push = rsync_transport_push;
730
731         } else if (!prefixcmp(url, "http://")
732                 || !prefixcmp(url, "https://")
733                 || !prefixcmp(url, "ftp://")) {
734 #ifdef NO_CURL
735                 error("git was compiled without libcurl support.");
736 #else
737                 ret->get_refs_list = get_refs_via_curl;
738                 ret->fetch = fetch_objs_via_curl;
739                 ret->push = curl_transport_push;
740 #endif
741                 ret->disconnect = disconnect_walker;
742
743         } else if (is_local(url) && is_file(url)) {
744                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
745                 ret->data = data;
746                 ret->get_refs_list = get_refs_from_bundle;
747                 ret->fetch = fetch_refs_from_bundle;
748                 ret->disconnect = close_bundle;
749
750         } else {
751                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
752                 ret->data = data;
753                 ret->set_option = set_git_option;
754                 ret->get_refs_list = get_refs_via_connect;
755                 ret->fetch = fetch_refs_via_pack;
756                 ret->push = git_transport_push;
757                 ret->disconnect = disconnect_git;
758
759                 data->thin = 1;
760                 data->conn = NULL;
761                 data->uploadpack = "git-upload-pack";
762                 if (remote && remote->uploadpack)
763                         data->uploadpack = remote->uploadpack;
764                 data->receivepack = "git-receive-pack";
765                 if (remote && remote->receivepack)
766                         data->receivepack = remote->receivepack;
767         }
768
769         return ret;
770 }
771
772 int transport_set_option(struct transport *transport,
773                          const char *name, const char *value)
774 {
775         if (transport->set_option)
776                 return transport->set_option(transport, name, value);
777         return 1;
778 }
779
780 int transport_push(struct transport *transport,
781                    int refspec_nr, const char **refspec, int flags)
782 {
783         if (!transport->push)
784                 return 1;
785         return transport->push(transport, refspec_nr, refspec, flags);
786 }
787
788 const struct ref *transport_get_remote_refs(struct transport *transport)
789 {
790         if (!transport->remote_refs)
791                 transport->remote_refs = transport->get_refs_list(transport);
792         return transport->remote_refs;
793 }
794
795 int transport_fetch_refs(struct transport *transport, const struct ref *refs)
796 {
797         int rc;
798         int nr_heads = 0, nr_alloc = 0;
799         const struct ref **heads = NULL;
800         const struct ref *rm;
801
802         for (rm = refs; rm; rm = rm->next) {
803                 if (rm->peer_ref &&
804                     !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
805                         continue;
806                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
807                 heads[nr_heads++] = rm;
808         }
809
810         rc = transport->fetch(transport, nr_heads, heads);
811         free(heads);
812         return rc;
813 }
814
815 void transport_unlock_pack(struct transport *transport)
816 {
817         if (transport->pack_lockfile) {
818                 unlink(transport->pack_lockfile);
819                 free(transport->pack_lockfile);
820                 transport->pack_lockfile = NULL;
821         }
822 }
823
824 int transport_disconnect(struct transport *transport)
825 {
826         int ret = 0;
827         if (transport->disconnect)
828                 ret = transport->disconnect(transport);
829         free(transport);
830         return ret;
831 }