Merge branch 'ph/parseopt'
[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 "walker.h"
10 #include "bundle.h"
11 #include "dir.h"
12 #include "refs.h"
13
14 /* rsync support */
15
16 /*
17  * We copy packed-refs and refs/ into a temporary file, then read the
18  * loose refs recursively (sorting whenever possible), and then inserting
19  * those packed refs that are not yet in the list (not validating, but
20  * assuming that the file is sorted).
21  *
22  * Appears refactoring this from refs.c is too cumbersome.
23  */
24
25 static int str_cmp(const void *a, const void *b)
26 {
27         const char *s1 = a;
28         const char *s2 = b;
29
30         return strcmp(s1, s2);
31 }
32
33 /* path->buf + name_offset is expected to point to "refs/" */
34
35 static int read_loose_refs(struct strbuf *path, int name_offset,
36                 struct ref **tail)
37 {
38         DIR *dir = opendir(path->buf);
39         struct dirent *de;
40         struct {
41                 char **entries;
42                 int nr, alloc;
43         } list;
44         int i, pathlen;
45
46         if (!dir)
47                 return -1;
48
49         memset (&list, 0, sizeof(list));
50
51         while ((de = readdir(dir))) {
52                 if (de->d_name[0] == '.' && (de->d_name[1] == '\0' ||
53                                 (de->d_name[1] == '.' &&
54                                  de->d_name[2] == '\0')))
55                         continue;
56                 ALLOC_GROW(list.entries, list.nr + 1, list.alloc);
57                 list.entries[list.nr++] = xstrdup(de->d_name);
58         }
59         closedir(dir);
60
61         /* sort the list */
62
63         qsort(list.entries, list.nr, sizeof(char *), str_cmp);
64
65         pathlen = path->len;
66         strbuf_addch(path, '/');
67
68         for (i = 0; i < list.nr; i++, strbuf_setlen(path, pathlen + 1)) {
69                 strbuf_addstr(path, list.entries[i]);
70                 if (read_loose_refs(path, name_offset, tail)) {
71                         int fd = open(path->buf, O_RDONLY);
72                         char buffer[40];
73                         struct ref *next;
74
75                         if (fd < 0)
76                                 continue;
77                         next = alloc_ref(path->len - name_offset + 1);
78                         if (read_in_full(fd, buffer, 40) != 40 ||
79                                         get_sha1_hex(buffer, next->old_sha1)) {
80                                 close(fd);
81                                 free(next);
82                                 continue;
83                         }
84                         close(fd);
85                         strcpy(next->name, path->buf + name_offset);
86                         (*tail)->next = next;
87                         *tail = next;
88                 }
89         }
90         strbuf_setlen(path, pathlen);
91
92         for (i = 0; i < list.nr; i++)
93                 free(list.entries[i]);
94         free(list.entries);
95
96         return 0;
97 }
98
99 /* insert the packed refs for which no loose refs were found */
100
101 static void insert_packed_refs(const char *packed_refs, struct ref **list)
102 {
103         FILE *f = fopen(packed_refs, "r");
104         static char buffer[PATH_MAX];
105
106         if (!f)
107                 return;
108
109         for (;;) {
110                 int cmp = cmp, len;
111
112                 if (!fgets(buffer, sizeof(buffer), f)) {
113                         fclose(f);
114                         return;
115                 }
116
117                 if (hexval(buffer[0]) > 0xf)
118                         continue;
119                 len = strlen(buffer);
120                 if (buffer[len - 1] == '\n')
121                         buffer[--len] = '\0';
122                 if (len < 41)
123                         continue;
124                 while ((*list)->next &&
125                                 (cmp = strcmp(buffer + 41,
126                                       (*list)->next->name)) > 0)
127                         list = &(*list)->next;
128                 if (!(*list)->next || cmp < 0) {
129                         struct ref *next = alloc_ref(len - 40);
130                         buffer[40] = '\0';
131                         if (get_sha1_hex(buffer, next->old_sha1)) {
132                                 warning ("invalid SHA-1: %s", buffer);
133                                 free(next);
134                                 continue;
135                         }
136                         strcpy(next->name, buffer + 41);
137                         next->next = (*list)->next;
138                         (*list)->next = next;
139                         list = &(*list)->next;
140                 }
141         }
142 }
143
144 static struct ref *get_refs_via_rsync(const struct transport *transport)
145 {
146         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
147         struct ref dummy, *tail = &dummy;
148         struct child_process rsync;
149         const char *args[5];
150         int temp_dir_len;
151
152         /* copy the refs to the temporary directory */
153
154         strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
155         if (!mkdtemp(temp_dir.buf))
156                 die ("Could not make temporary directory");
157         temp_dir_len = temp_dir.len;
158
159         strbuf_addstr(&buf, transport->url);
160         strbuf_addstr(&buf, "/refs");
161
162         memset(&rsync, 0, sizeof(rsync));
163         rsync.argv = args;
164         rsync.stdout_to_stderr = 1;
165         args[0] = "rsync";
166         args[1] = (transport->verbose > 0) ? "-rv" : "-r";
167         args[2] = buf.buf;
168         args[3] = temp_dir.buf;
169         args[4] = NULL;
170
171         if (run_command(&rsync))
172                 die ("Could not run rsync to get refs");
173
174         strbuf_reset(&buf);
175         strbuf_addstr(&buf, transport->url);
176         strbuf_addstr(&buf, "/packed-refs");
177
178         args[2] = buf.buf;
179
180         if (run_command(&rsync))
181                 die ("Could not run rsync to get refs");
182
183         /* read the copied refs */
184
185         strbuf_addstr(&temp_dir, "/refs");
186         read_loose_refs(&temp_dir, temp_dir_len + 1, &tail);
187         strbuf_setlen(&temp_dir, temp_dir_len);
188
189         tail = &dummy;
190         strbuf_addstr(&temp_dir, "/packed-refs");
191         insert_packed_refs(temp_dir.buf, &tail);
192         strbuf_setlen(&temp_dir, temp_dir_len);
193
194         if (remove_dir_recursively(&temp_dir, 0))
195                 warning ("Error removing temporary directory %s.",
196                                 temp_dir.buf);
197
198         strbuf_release(&buf);
199         strbuf_release(&temp_dir);
200
201         return dummy.next;
202 }
203
204 static int fetch_objs_via_rsync(struct transport *transport,
205                                  int nr_objs, struct ref **to_fetch)
206 {
207         struct strbuf buf = STRBUF_INIT;
208         struct child_process rsync;
209         const char *args[8];
210         int result;
211
212         strbuf_addstr(&buf, transport->url);
213         strbuf_addstr(&buf, "/objects/");
214
215         memset(&rsync, 0, sizeof(rsync));
216         rsync.argv = args;
217         rsync.stdout_to_stderr = 1;
218         args[0] = "rsync";
219         args[1] = (transport->verbose > 0) ? "-rv" : "-r";
220         args[2] = "--ignore-existing";
221         args[3] = "--exclude";
222         args[4] = "info";
223         args[5] = buf.buf;
224         args[6] = get_object_directory();
225         args[7] = NULL;
226
227         /* NEEDSWORK: handle one level of alternates */
228         result = run_command(&rsync);
229
230         strbuf_release(&buf);
231
232         return result;
233 }
234
235 static int write_one_ref(const char *name, const unsigned char *sha1,
236                 int flags, void *data)
237 {
238         struct strbuf *buf = data;
239         int len = buf->len;
240         FILE *f;
241
242         /* when called via for_each_ref(), flags is non-zero */
243         if (flags && prefixcmp(name, "refs/heads/") &&
244                         prefixcmp(name, "refs/tags/"))
245                 return 0;
246
247         strbuf_addstr(buf, name);
248         if (safe_create_leading_directories(buf->buf) ||
249                         !(f = fopen(buf->buf, "w")) ||
250                         fprintf(f, "%s\n", sha1_to_hex(sha1)) < 0 ||
251                         fclose(f))
252                 return error("problems writing temporary file %s", buf->buf);
253         strbuf_setlen(buf, len);
254         return 0;
255 }
256
257 static int write_refs_to_temp_dir(struct strbuf *temp_dir,
258                 int refspec_nr, const char **refspec)
259 {
260         int i;
261
262         for (i = 0; i < refspec_nr; i++) {
263                 unsigned char sha1[20];
264                 char *ref;
265
266                 if (dwim_ref(refspec[i], strlen(refspec[i]), sha1, &ref) != 1)
267                         return error("Could not get ref %s", refspec[i]);
268
269                 if (write_one_ref(ref, sha1, 0, temp_dir)) {
270                         free(ref);
271                         return -1;
272                 }
273                 free(ref);
274         }
275         return 0;
276 }
277
278 static int rsync_transport_push(struct transport *transport,
279                 int refspec_nr, const char **refspec, int flags)
280 {
281         struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
282         int result = 0, i;
283         struct child_process rsync;
284         const char *args[10];
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 static int fetch_objs_via_walker(struct transport *transport,
348                                  int nr_objs, struct ref **to_fetch)
349 {
350         char *dest = xstrdup(transport->url);
351         struct walker *walker = transport->data;
352         char **objs = xmalloc(nr_objs * sizeof(*objs));
353         int i;
354
355         walker->get_all = 1;
356         walker->get_tree = 1;
357         walker->get_history = 1;
358         walker->get_verbosely = transport->verbose >= 0;
359         walker->get_recover = 0;
360
361         for (i = 0; i < nr_objs; i++)
362                 objs[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
363
364         if (walker_fetch(walker, nr_objs, objs, NULL, NULL))
365                 die("Fetch failed.");
366
367         for (i = 0; i < nr_objs; i++)
368                 free(objs[i]);
369         free(objs);
370         free(dest);
371         return 0;
372 }
373
374 static int disconnect_walker(struct transport *transport)
375 {
376         struct walker *walker = transport->data;
377         if (walker)
378                 walker_free(walker);
379         return 0;
380 }
381
382 #ifndef NO_CURL
383 static int curl_transport_push(struct transport *transport, int refspec_nr, const char **refspec, int flags) {
384         const char **argv;
385         int argc;
386         int err;
387
388         argv = xmalloc((refspec_nr + 11) * sizeof(char *));
389         argv[0] = "http-push";
390         argc = 1;
391         if (flags & TRANSPORT_PUSH_ALL)
392                 argv[argc++] = "--all";
393         if (flags & TRANSPORT_PUSH_FORCE)
394                 argv[argc++] = "--force";
395         if (flags & TRANSPORT_PUSH_DRY_RUN)
396                 argv[argc++] = "--dry-run";
397         argv[argc++] = transport->url;
398         while (refspec_nr--)
399                 argv[argc++] = *refspec++;
400         argv[argc] = NULL;
401         err = run_command_v_opt(argv, RUN_GIT_CMD);
402         switch (err) {
403         case -ERR_RUN_COMMAND_FORK:
404                 error("unable to fork for %s", argv[0]);
405         case -ERR_RUN_COMMAND_EXEC:
406                 error("unable to exec %s", argv[0]);
407                 break;
408         case -ERR_RUN_COMMAND_WAITPID:
409         case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
410         case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
411         case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
412                 error("%s died with strange error", argv[0]);
413         }
414         return !!err;
415 }
416
417 static int missing__target(int code, int result)
418 {
419         return  /* file:// URL -- do we ever use one??? */
420                 (result == CURLE_FILE_COULDNT_READ_FILE) ||
421                 /* http:// and https:// URL */
422                 (code == 404 && result == CURLE_HTTP_RETURNED_ERROR) ||
423                 /* ftp:// URL */
424                 (code == 550 && result == CURLE_FTP_COULDNT_RETR_FILE)
425                 ;
426 }
427
428 #define missing_target(a) missing__target((a)->http_code, (a)->curl_result)
429
430 static struct ref *get_refs_via_curl(const struct transport *transport)
431 {
432         struct buffer buffer;
433         char *data, *start, *mid;
434         char *ref_name;
435         char *refs_url;
436         int i = 0;
437
438         struct active_request_slot *slot;
439         struct slot_results results;
440
441         struct ref *refs = NULL;
442         struct ref *ref = NULL;
443         struct ref *last_ref = NULL;
444
445         data = xmalloc(4096);
446         buffer.size = 4096;
447         buffer.posn = 0;
448         buffer.buffer = data;
449
450         refs_url = xmalloc(strlen(transport->url) + 11);
451         sprintf(refs_url, "%s/info/refs", transport->url);
452
453         http_init();
454
455         slot = get_active_slot();
456         slot->results = &results;
457         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
458         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
459         curl_easy_setopt(slot->curl, CURLOPT_URL, refs_url);
460         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
461         if (start_active_slot(slot)) {
462                 run_active_slot(slot);
463                 if (results.curl_result != CURLE_OK) {
464                         if (missing_target(&results)) {
465                                 free(buffer.buffer);
466                                 return NULL;
467                         } else {
468                                 free(buffer.buffer);
469                                 error("%s", curl_errorstr);
470                                 return NULL;
471                         }
472                 }
473         } else {
474                 free(buffer.buffer);
475                 error("Unable to start request");
476                 return NULL;
477         }
478
479         http_cleanup();
480
481         data = buffer.buffer;
482         start = NULL;
483         mid = data;
484         while (i < buffer.posn) {
485                 if (!start)
486                         start = &data[i];
487                 if (data[i] == '\t')
488                         mid = &data[i];
489                 if (data[i] == '\n') {
490                         data[i] = 0;
491                         ref_name = mid + 1;
492                         ref = xmalloc(sizeof(struct ref) +
493                                       strlen(ref_name) + 1);
494                         memset(ref, 0, sizeof(struct ref));
495                         strcpy(ref->name, ref_name);
496                         get_sha1_hex(start, ref->old_sha1);
497                         if (!refs)
498                                 refs = ref;
499                         if (last_ref)
500                                 last_ref->next = ref;
501                         last_ref = ref;
502                         start = NULL;
503                 }
504                 i++;
505         }
506
507         free(buffer.buffer);
508
509         return refs;
510 }
511
512 static int fetch_objs_via_curl(struct transport *transport,
513                                  int nr_objs, struct ref **to_fetch)
514 {
515         if (!transport->data)
516                 transport->data = get_http_walker(transport->url);
517         return fetch_objs_via_walker(transport, nr_objs, to_fetch);
518 }
519
520 #endif
521
522 struct bundle_transport_data {
523         int fd;
524         struct bundle_header header;
525 };
526
527 static struct ref *get_refs_from_bundle(const struct transport *transport)
528 {
529         struct bundle_transport_data *data = transport->data;
530         struct ref *result = NULL;
531         int i;
532
533         if (data->fd > 0)
534                 close(data->fd);
535         data->fd = read_bundle_header(transport->url, &data->header);
536         if (data->fd < 0)
537                 die ("Could not read bundle '%s'.", transport->url);
538         for (i = 0; i < data->header.references.nr; i++) {
539                 struct ref_list_entry *e = data->header.references.list + i;
540                 struct ref *ref = alloc_ref(strlen(e->name) + 1);
541                 hashcpy(ref->old_sha1, e->sha1);
542                 strcpy(ref->name, e->name);
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, 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         int depth;
569         const char *uploadpack;
570         const char *receivepack;
571 };
572
573 static int set_git_option(struct transport *connection,
574                           const char *name, const char *value)
575 {
576         struct git_transport_data *data = connection->data;
577         if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
578                 data->uploadpack = value;
579                 return 0;
580         } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
581                 data->receivepack = value;
582                 return 0;
583         } else if (!strcmp(name, TRANS_OPT_THIN)) {
584                 data->thin = !!value;
585                 return 0;
586         } else if (!strcmp(name, TRANS_OPT_KEEP)) {
587                 data->keep = !!value;
588                 return 0;
589         } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
590                 if (!value)
591                         data->depth = 0;
592                 else
593                         data->depth = atoi(value);
594                 return 0;
595         }
596         return 1;
597 }
598
599 static struct ref *get_refs_via_connect(const struct transport *transport)
600 {
601         struct git_transport_data *data = transport->data;
602         struct ref *refs;
603         int fd[2];
604         char *dest = xstrdup(transport->url);
605         struct child_process *conn = git_connect(fd, dest, data->uploadpack, 0);
606
607         get_remote_heads(fd[0], &refs, 0, NULL, 0);
608         packet_flush(fd[1]);
609
610         finish_connect(conn);
611
612         free(dest);
613
614         return refs;
615 }
616
617 static int fetch_refs_via_pack(struct transport *transport,
618                                int nr_heads, struct ref **to_fetch)
619 {
620         struct git_transport_data *data = transport->data;
621         char **heads = xmalloc(nr_heads * sizeof(*heads));
622         char **origh = xmalloc(nr_heads * sizeof(*origh));
623         struct ref *refs;
624         char *dest = xstrdup(transport->url);
625         struct fetch_pack_args args;
626         int i;
627
628         memset(&args, 0, sizeof(args));
629         args.uploadpack = data->uploadpack;
630         args.keep_pack = data->keep;
631         args.lock_pack = 1;
632         args.use_thin_pack = data->thin;
633         args.verbose = transport->verbose > 0;
634         args.depth = data->depth;
635
636         for (i = 0; i < nr_heads; i++)
637                 origh[i] = heads[i] = xstrdup(to_fetch[i]->name);
638         refs = fetch_pack(&args, dest, nr_heads, heads, &transport->pack_lockfile);
639
640         for (i = 0; i < nr_heads; i++)
641                 free(origh[i]);
642         free(origh);
643         free(heads);
644         free_refs(refs);
645         free(dest);
646         return 0;
647 }
648
649 static int git_transport_push(struct transport *transport, int refspec_nr, const char **refspec, int flags) {
650         struct git_transport_data *data = transport->data;
651         const char **argv;
652         char *rem;
653         int argc;
654         int err;
655
656         argv = xmalloc((refspec_nr + 11) * sizeof(char *));
657         argv[0] = "send-pack";
658         argc = 1;
659         if (flags & TRANSPORT_PUSH_ALL)
660                 argv[argc++] = "--all";
661         if (flags & TRANSPORT_PUSH_FORCE)
662                 argv[argc++] = "--force";
663         if (flags & TRANSPORT_PUSH_DRY_RUN)
664                 argv[argc++] = "--dry-run";
665         if (data->receivepack) {
666                 char *rp = xmalloc(strlen(data->receivepack) + 16);
667                 sprintf(rp, "--receive-pack=%s", data->receivepack);
668                 argv[argc++] = rp;
669         }
670         if (data->thin)
671                 argv[argc++] = "--thin";
672         rem = xmalloc(strlen(transport->remote->name) + 10);
673         sprintf(rem, "--remote=%s", transport->remote->name);
674         argv[argc++] = rem;
675         argv[argc++] = transport->url;
676         while (refspec_nr--)
677                 argv[argc++] = *refspec++;
678         argv[argc] = NULL;
679         err = run_command_v_opt(argv, RUN_GIT_CMD);
680         switch (err) {
681         case -ERR_RUN_COMMAND_FORK:
682                 error("unable to fork for %s", argv[0]);
683         case -ERR_RUN_COMMAND_EXEC:
684                 error("unable to exec %s", argv[0]);
685                 break;
686         case -ERR_RUN_COMMAND_WAITPID:
687         case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
688         case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
689         case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
690                 error("%s died with strange error", argv[0]);
691         }
692         return !!err;
693 }
694
695 static int disconnect_git(struct transport *transport)
696 {
697         free(transport->data);
698         return 0;
699 }
700
701 static int is_local(const char *url)
702 {
703         const char *colon = strchr(url, ':');
704         const char *slash = strchr(url, '/');
705         return !colon || (slash && slash < colon);
706 }
707
708 static int is_file(const char *url)
709 {
710         struct stat buf;
711         if (stat(url, &buf))
712                 return 0;
713         return S_ISREG(buf.st_mode);
714 }
715
716 struct transport *transport_get(struct remote *remote, const char *url)
717 {
718         struct transport *ret = xcalloc(1, sizeof(*ret));
719
720         ret->remote = remote;
721         ret->url = url;
722
723         if (!prefixcmp(url, "rsync://")) {
724                 ret->get_refs_list = get_refs_via_rsync;
725                 ret->fetch = fetch_objs_via_rsync;
726                 ret->push = rsync_transport_push;
727
728         } else if (!prefixcmp(url, "http://")
729                 || !prefixcmp(url, "https://")
730                 || !prefixcmp(url, "ftp://")) {
731 #ifdef NO_CURL
732                 error("git was compiled without libcurl support.");
733 #else
734                 ret->get_refs_list = get_refs_via_curl;
735                 ret->fetch = fetch_objs_via_curl;
736                 ret->push = curl_transport_push;
737 #endif
738                 ret->disconnect = disconnect_walker;
739
740         } else if (is_local(url) && is_file(url)) {
741                 struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
742                 ret->data = data;
743                 ret->get_refs_list = get_refs_from_bundle;
744                 ret->fetch = fetch_refs_from_bundle;
745                 ret->disconnect = close_bundle;
746
747         } else {
748                 struct git_transport_data *data = xcalloc(1, sizeof(*data));
749                 ret->data = data;
750                 ret->set_option = set_git_option;
751                 ret->get_refs_list = get_refs_via_connect;
752                 ret->fetch = fetch_refs_via_pack;
753                 ret->push = git_transport_push;
754                 ret->disconnect = disconnect_git;
755
756                 data->thin = 1;
757                 data->uploadpack = "git-upload-pack";
758                 if (remote && remote->uploadpack)
759                         data->uploadpack = remote->uploadpack;
760                 data->receivepack = "git-receive-pack";
761                 if (remote && remote->receivepack)
762                         data->receivepack = remote->receivepack;
763         }
764
765         return ret;
766 }
767
768 int transport_set_option(struct transport *transport,
769                          const char *name, const char *value)
770 {
771         if (transport->set_option)
772                 return transport->set_option(transport, name, value);
773         return 1;
774 }
775
776 int transport_push(struct transport *transport,
777                    int refspec_nr, const char **refspec, int flags)
778 {
779         if (!transport->push)
780                 return 1;
781         return transport->push(transport, refspec_nr, refspec, flags);
782 }
783
784 struct ref *transport_get_remote_refs(struct transport *transport)
785 {
786         if (!transport->remote_refs)
787                 transport->remote_refs = transport->get_refs_list(transport);
788         return transport->remote_refs;
789 }
790
791 int transport_fetch_refs(struct transport *transport, struct ref *refs)
792 {
793         int rc;
794         int nr_heads = 0, nr_alloc = 0;
795         struct ref **heads = NULL;
796         struct ref *rm;
797
798         for (rm = refs; rm; rm = rm->next) {
799                 if (rm->peer_ref &&
800                     !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
801                         continue;
802                 ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
803                 heads[nr_heads++] = rm;
804         }
805
806         rc = transport->fetch(transport, nr_heads, heads);
807         free(heads);
808         return rc;
809 }
810
811 void transport_unlock_pack(struct transport *transport)
812 {
813         if (transport->pack_lockfile) {
814                 unlink(transport->pack_lockfile);
815                 free(transport->pack_lockfile);
816                 transport->pack_lockfile = NULL;
817         }
818 }
819
820 int transport_disconnect(struct transport *transport)
821 {
822         int ret = 0;
823         if (transport->disconnect)
824                 ret = transport->disconnect(transport);
825         free(transport);
826         return ret;
827 }