Andrew's git / gitweb.git / transport.c
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transport.con commit Merge branch 'jk/terse-push' into aw/mirror-push (1496553)
   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
  26static 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
  36static 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 (de->d_name[0] == '.' && (de->d_name[1] == '\0' ||
  54                                (de->d_name[1] == '.' &&
  55                                 de->d_name[2] == '\0')))
  56                        continue;
  57                ALLOC_GROW(list.entries, list.nr + 1, list.alloc);
  58                list.entries[list.nr++] = xstrdup(de->d_name);
  59        }
  60        closedir(dir);
  61
  62        /* sort the list */
  63
  64        qsort(list.entries, list.nr, sizeof(char *), str_cmp);
  65
  66        pathlen = path->len;
  67        strbuf_addch(path, '/');
  68
  69        for (i = 0; i < list.nr; i++, strbuf_setlen(path, pathlen + 1)) {
  70                strbuf_addstr(path, list.entries[i]);
  71                if (read_loose_refs(path, name_offset, tail)) {
  72                        int fd = open(path->buf, O_RDONLY);
  73                        char buffer[40];
  74                        struct ref *next;
  75
  76                        if (fd < 0)
  77                                continue;
  78                        next = alloc_ref(path->len - name_offset + 1);
  79                        if (read_in_full(fd, buffer, 40) != 40 ||
  80                                        get_sha1_hex(buffer, next->old_sha1)) {
  81                                close(fd);
  82                                free(next);
  83                                continue;
  84                        }
  85                        close(fd);
  86                        strcpy(next->name, path->buf + name_offset);
  87                        (*tail)->next = next;
  88                        *tail = next;
  89                }
  90        }
  91        strbuf_setlen(path, pathlen);
  92
  93        for (i = 0; i < list.nr; i++)
  94                free(list.entries[i]);
  95        free(list.entries);
  96
  97        return 0;
  98}
  99
 100/* insert the packed refs for which no loose refs were found */
 101
 102static void insert_packed_refs(const char *packed_refs, struct ref **list)
 103{
 104        FILE *f = fopen(packed_refs, "r");
 105        static char buffer[PATH_MAX];
 106
 107        if (!f)
 108                return;
 109
 110        for (;;) {
 111                int cmp = cmp, len;
 112
 113                if (!fgets(buffer, sizeof(buffer), f)) {
 114                        fclose(f);
 115                        return;
 116                }
 117
 118                if (hexval(buffer[0]) > 0xf)
 119                        continue;
 120                len = strlen(buffer);
 121                if (buffer[len - 1] == '\n')
 122                        buffer[--len] = '\0';
 123                if (len < 41)
 124                        continue;
 125                while ((*list)->next &&
 126                                (cmp = strcmp(buffer + 41,
 127                                      (*list)->next->name)) > 0)
 128                        list = &(*list)->next;
 129                if (!(*list)->next || cmp < 0) {
 130                        struct ref *next = alloc_ref(len - 40);
 131                        buffer[40] = '\0';
 132                        if (get_sha1_hex(buffer, next->old_sha1)) {
 133                                warning ("invalid SHA-1: %s", buffer);
 134                                free(next);
 135                                continue;
 136                        }
 137                        strcpy(next->name, buffer + 41);
 138                        next->next = (*list)->next;
 139                        (*list)->next = next;
 140                        list = &(*list)->next;
 141                }
 142        }
 143}
 144
 145static struct ref *get_refs_via_rsync(struct transport *transport)
 146{
 147        struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 148        struct ref dummy, *tail = &dummy;
 149        struct child_process rsync;
 150        const char *args[5];
 151        int temp_dir_len;
 152
 153        /* copy the refs to the temporary directory */
 154
 155        strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 156        if (!mkdtemp(temp_dir.buf))
 157                die ("Could not make temporary directory");
 158        temp_dir_len = temp_dir.len;
 159
 160        strbuf_addstr(&buf, transport->url);
 161        strbuf_addstr(&buf, "/refs");
 162
 163        memset(&rsync, 0, sizeof(rsync));
 164        rsync.argv = args;
 165        rsync.stdout_to_stderr = 1;
 166        args[0] = "rsync";
 167        args[1] = (transport->verbose > 0) ? "-rv" : "-r";
 168        args[2] = buf.buf;
 169        args[3] = temp_dir.buf;
 170        args[4] = NULL;
 171
 172        if (run_command(&rsync))
 173                die ("Could not run rsync to get refs");
 174
 175        strbuf_reset(&buf);
 176        strbuf_addstr(&buf, transport->url);
 177        strbuf_addstr(&buf, "/packed-refs");
 178
 179        args[2] = buf.buf;
 180
 181        if (run_command(&rsync))
 182                die ("Could not run rsync to get refs");
 183
 184        /* read the copied refs */
 185
 186        strbuf_addstr(&temp_dir, "/refs");
 187        read_loose_refs(&temp_dir, temp_dir_len + 1, &tail);
 188        strbuf_setlen(&temp_dir, temp_dir_len);
 189
 190        tail = &dummy;
 191        strbuf_addstr(&temp_dir, "/packed-refs");
 192        insert_packed_refs(temp_dir.buf, &tail);
 193        strbuf_setlen(&temp_dir, temp_dir_len);
 194
 195        if (remove_dir_recursively(&temp_dir, 0))
 196                warning ("Error removing temporary directory %s.",
 197                                temp_dir.buf);
 198
 199        strbuf_release(&buf);
 200        strbuf_release(&temp_dir);
 201
 202        return dummy.next;
 203}
 204
 205static int fetch_objs_via_rsync(struct transport *transport,
 206                                 int nr_objs, struct ref **to_fetch)
 207{
 208        struct strbuf buf = STRBUF_INIT;
 209        struct child_process rsync;
 210        const char *args[8];
 211        int result;
 212
 213        strbuf_addstr(&buf, transport->url);
 214        strbuf_addstr(&buf, "/objects/");
 215
 216        memset(&rsync, 0, sizeof(rsync));
 217        rsync.argv = args;
 218        rsync.stdout_to_stderr = 1;
 219        args[0] = "rsync";
 220        args[1] = (transport->verbose > 0) ? "-rv" : "-r";
 221        args[2] = "--ignore-existing";
 222        args[3] = "--exclude";
 223        args[4] = "info";
 224        args[5] = buf.buf;
 225        args[6] = get_object_directory();
 226        args[7] = NULL;
 227
 228        /* NEEDSWORK: handle one level of alternates */
 229        result = run_command(&rsync);
 230
 231        strbuf_release(&buf);
 232
 233        return result;
 234}
 235
 236static int write_one_ref(const char *name, const unsigned char *sha1,
 237                int flags, void *data)
 238{
 239        struct strbuf *buf = data;
 240        int len = buf->len;
 241        FILE *f;
 242
 243        /* when called via for_each_ref(), flags is non-zero */
 244        if (flags && prefixcmp(name, "refs/heads/") &&
 245                        prefixcmp(name, "refs/tags/"))
 246                return 0;
 247
 248        strbuf_addstr(buf, name);
 249        if (safe_create_leading_directories(buf->buf) ||
 250                        !(f = fopen(buf->buf, "w")) ||
 251                        fprintf(f, "%s\n", sha1_to_hex(sha1)) < 0 ||
 252                        fclose(f))
 253                return error("problems writing temporary file %s", buf->buf);
 254        strbuf_setlen(buf, len);
 255        return 0;
 256}
 257
 258static int write_refs_to_temp_dir(struct strbuf *temp_dir,
 259                int refspec_nr, const char **refspec)
 260{
 261        int i;
 262
 263        for (i = 0; i < refspec_nr; i++) {
 264                unsigned char sha1[20];
 265                char *ref;
 266
 267                if (dwim_ref(refspec[i], strlen(refspec[i]), sha1, &ref) != 1)
 268                        return error("Could not get ref %s", refspec[i]);
 269
 270                if (write_one_ref(ref, sha1, 0, temp_dir)) {
 271                        free(ref);
 272                        return -1;
 273                }
 274                free(ref);
 275        }
 276        return 0;
 277}
 278
 279static int rsync_transport_push(struct transport *transport,
 280                int refspec_nr, const char **refspec, int flags)
 281{
 282        struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 283        int result = 0, i;
 284        struct child_process rsync;
 285        const char *args[10];
 286
 287        /* first push the objects */
 288
 289        strbuf_addstr(&buf, transport->url);
 290        strbuf_addch(&buf, '/');
 291
 292        memset(&rsync, 0, sizeof(rsync));
 293        rsync.argv = args;
 294        rsync.stdout_to_stderr = 1;
 295        i = 0;
 296        args[i++] = "rsync";
 297        args[i++] = "-a";
 298        if (flags & TRANSPORT_PUSH_DRY_RUN)
 299                args[i++] = "--dry-run";
 300        if (transport->verbose > 0)
 301                args[i++] = "-v";
 302        args[i++] = "--ignore-existing";
 303        args[i++] = "--exclude";
 304        args[i++] = "info";
 305        args[i++] = get_object_directory();
 306        args[i++] = buf.buf;
 307        args[i++] = NULL;
 308
 309        if (run_command(&rsync))
 310                return error("Could not push objects to %s", transport->url);
 311
 312        /* copy the refs to the temporary directory; they could be packed. */
 313
 314        strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 315        if (!mkdtemp(temp_dir.buf))
 316                die ("Could not make temporary directory");
 317        strbuf_addch(&temp_dir, '/');
 318
 319        if (flags & TRANSPORT_PUSH_ALL) {
 320                if (for_each_ref(write_one_ref, &temp_dir))
 321                        return -1;
 322        } else if (write_refs_to_temp_dir(&temp_dir, refspec_nr, refspec))
 323                return -1;
 324
 325        i = 2;
 326        if (flags & TRANSPORT_PUSH_DRY_RUN)
 327                args[i++] = "--dry-run";
 328        if (!(flags & TRANSPORT_PUSH_FORCE))
 329                args[i++] = "--ignore-existing";
 330        args[i++] = temp_dir.buf;
 331        args[i++] = transport->url;
 332        args[i++] = NULL;
 333        if (run_command(&rsync))
 334                result = error("Could not push to %s", transport->url);
 335
 336        if (remove_dir_recursively(&temp_dir, 0))
 337                warning ("Could not remove temporary directory %s.",
 338                                temp_dir.buf);
 339
 340        strbuf_release(&buf);
 341        strbuf_release(&temp_dir);
 342
 343        return result;
 344}
 345
 346/* Generic functions for using commit walkers */
 347
 348static int fetch_objs_via_walker(struct transport *transport,
 349                                 int nr_objs, 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
 375static int disconnect_walker(struct transport *transport)
 376{
 377        struct walker *walker = transport->data;
 378        if (walker)
 379                walker_free(walker);
 380        return 0;
 381}
 382
 383#ifndef NO_CURL
 384static int curl_transport_push(struct transport *transport, int refspec_nr, const char **refspec, int flags) {
 385        const char **argv;
 386        int argc;
 387        int err;
 388
 389        argv = xmalloc((refspec_nr + 11) * sizeof(char *));
 390        argv[0] = "http-push";
 391        argc = 1;
 392        if (flags & TRANSPORT_PUSH_ALL)
 393                argv[argc++] = "--all";
 394        if (flags & TRANSPORT_PUSH_FORCE)
 395                argv[argc++] = "--force";
 396        if (flags & TRANSPORT_PUSH_DRY_RUN)
 397                argv[argc++] = "--dry-run";
 398        argv[argc++] = transport->url;
 399        while (refspec_nr--)
 400                argv[argc++] = *refspec++;
 401        argv[argc] = NULL;
 402        err = run_command_v_opt(argv, RUN_GIT_CMD);
 403        switch (err) {
 404        case -ERR_RUN_COMMAND_FORK:
 405                error("unable to fork for %s", argv[0]);
 406        case -ERR_RUN_COMMAND_EXEC:
 407                error("unable to exec %s", argv[0]);
 408                break;
 409        case -ERR_RUN_COMMAND_WAITPID:
 410        case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
 411        case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
 412        case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
 413                error("%s died with strange error", argv[0]);
 414        }
 415        return !!err;
 416}
 417
 418static int missing__target(int code, int result)
 419{
 420        return  /* file:// URL -- do we ever use one??? */
 421                (result == CURLE_FILE_COULDNT_READ_FILE) ||
 422                /* http:// and https:// URL */
 423                (code == 404 && result == CURLE_HTTP_RETURNED_ERROR) ||
 424                /* ftp:// URL */
 425                (code == 550 && result == CURLE_FTP_COULDNT_RETR_FILE)
 426                ;
 427}
 428
 429#define missing_target(a) missing__target((a)->http_code, (a)->curl_result)
 430
 431static struct ref *get_refs_via_curl(struct transport *transport)
 432{
 433        struct buffer buffer;
 434        char *data, *start, *mid;
 435        char *ref_name;
 436        char *refs_url;
 437        int i = 0;
 438
 439        struct active_request_slot *slot;
 440        struct slot_results results;
 441
 442        struct ref *refs = NULL;
 443        struct ref *ref = NULL;
 444        struct ref *last_ref = NULL;
 445
 446        data = xmalloc(4096);
 447        buffer.size = 4096;
 448        buffer.posn = 0;
 449        buffer.buffer = data;
 450
 451        refs_url = xmalloc(strlen(transport->url) + 11);
 452        sprintf(refs_url, "%s/info/refs", transport->url);
 453
 454        http_init();
 455
 456        slot = get_active_slot();
 457        slot->results = &results;
 458        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
 459        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 460        curl_easy_setopt(slot->curl, CURLOPT_URL, refs_url);
 461        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
 462        if (start_active_slot(slot)) {
 463                run_active_slot(slot);
 464                if (results.curl_result != CURLE_OK) {
 465                        if (missing_target(&results)) {
 466                                free(buffer.buffer);
 467                                return NULL;
 468                        } else {
 469                                free(buffer.buffer);
 470                                error("%s", curl_errorstr);
 471                                return NULL;
 472                        }
 473                }
 474        } else {
 475                free(buffer.buffer);
 476                error("Unable to start request");
 477                return NULL;
 478        }
 479
 480        http_cleanup();
 481
 482        data = buffer.buffer;
 483        start = NULL;
 484        mid = data;
 485        while (i < buffer.posn) {
 486                if (!start)
 487                        start = &data[i];
 488                if (data[i] == '\t')
 489                        mid = &data[i];
 490                if (data[i] == '\n') {
 491                        data[i] = 0;
 492                        ref_name = mid + 1;
 493                        ref = xmalloc(sizeof(struct ref) +
 494                                      strlen(ref_name) + 1);
 495                        memset(ref, 0, sizeof(struct ref));
 496                        strcpy(ref->name, ref_name);
 497                        get_sha1_hex(start, ref->old_sha1);
 498                        if (!refs)
 499                                refs = ref;
 500                        if (last_ref)
 501                                last_ref->next = ref;
 502                        last_ref = ref;
 503                        start = NULL;
 504                }
 505                i++;
 506        }
 507
 508        free(buffer.buffer);
 509
 510        return refs;
 511}
 512
 513static int fetch_objs_via_curl(struct transport *transport,
 514                                 int nr_objs, struct ref **to_fetch)
 515{
 516        if (!transport->data)
 517                transport->data = get_http_walker(transport->url);
 518        return fetch_objs_via_walker(transport, nr_objs, to_fetch);
 519}
 520
 521#endif
 522
 523struct bundle_transport_data {
 524        int fd;
 525        struct bundle_header header;
 526};
 527
 528static 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(strlen(e->name) + 1);
 542                hashcpy(ref->old_sha1, e->sha1);
 543                strcpy(ref->name, e->name);
 544                ref->next = result;
 545                result = ref;
 546        }
 547        return result;
 548}
 549
 550static int fetch_refs_from_bundle(struct transport *transport,
 551                               int nr_heads, struct ref **to_fetch)
 552{
 553        struct bundle_transport_data *data = transport->data;
 554        return unbundle(&data->header, data->fd);
 555}
 556
 557static int close_bundle(struct transport *transport)
 558{
 559        struct bundle_transport_data *data = transport->data;
 560        if (data->fd > 0)
 561                close(data->fd);
 562        free(data);
 563        return 0;
 564}
 565
 566struct git_transport_data {
 567        unsigned thin : 1;
 568        unsigned keep : 1;
 569        int depth;
 570        const char *uploadpack;
 571        const char *receivepack;
 572};
 573
 574static int set_git_option(struct transport *connection,
 575                          const char *name, const char *value)
 576{
 577        struct git_transport_data *data = connection->data;
 578        if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 579                data->uploadpack = value;
 580                return 0;
 581        } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 582                data->receivepack = value;
 583                return 0;
 584        } else if (!strcmp(name, TRANS_OPT_THIN)) {
 585                data->thin = !!value;
 586                return 0;
 587        } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 588                data->keep = !!value;
 589                return 0;
 590        } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 591                if (!value)
 592                        data->depth = 0;
 593                else
 594                        data->depth = atoi(value);
 595                return 0;
 596        }
 597        return 1;
 598}
 599
 600static struct ref *get_refs_via_connect(struct transport *transport)
 601{
 602        struct git_transport_data *data = transport->data;
 603        struct ref *refs;
 604        int fd[2];
 605        char *dest = xstrdup(transport->url);
 606        struct child_process *conn = git_connect(fd, dest, data->uploadpack, 0);
 607
 608        get_remote_heads(fd[0], &refs, 0, NULL, 0);
 609        packet_flush(fd[1]);
 610
 611        finish_connect(conn);
 612
 613        free(dest);
 614
 615        return refs;
 616}
 617
 618static int fetch_refs_via_pack(struct transport *transport,
 619                               int nr_heads, struct ref **to_fetch)
 620{
 621        struct git_transport_data *data = transport->data;
 622        char **heads = xmalloc(nr_heads * sizeof(*heads));
 623        char **origh = xmalloc(nr_heads * sizeof(*origh));
 624        struct ref *refs;
 625        char *dest = xstrdup(transport->url);
 626        struct fetch_pack_args args;
 627        int i;
 628
 629        memset(&args, 0, sizeof(args));
 630        args.uploadpack = data->uploadpack;
 631        args.keep_pack = data->keep;
 632        args.lock_pack = 1;
 633        args.use_thin_pack = data->thin;
 634        args.verbose = transport->verbose > 0;
 635        args.depth = data->depth;
 636
 637        for (i = 0; i < nr_heads; i++)
 638                origh[i] = heads[i] = xstrdup(to_fetch[i]->name);
 639        refs = fetch_pack(&args, dest, nr_heads, heads, &transport->pack_lockfile);
 640
 641        for (i = 0; i < nr_heads; i++)
 642                free(origh[i]);
 643        free(origh);
 644        free(heads);
 645        free_refs(refs);
 646        free(dest);
 647        return 0;
 648}
 649
 650static int git_transport_push(struct transport *transport, int refspec_nr, const char **refspec, int flags) {
 651        struct git_transport_data *data = transport->data;
 652        struct send_pack_args args;
 653
 654        args.receivepack = data->receivepack;
 655        args.send_all = !!(flags & TRANSPORT_PUSH_ALL);
 656        args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 657        args.use_thin_pack = data->thin;
 658        args.verbose = transport->verbose;
 659        args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 660
 661        return send_pack(&args, transport->url, transport->remote, refspec_nr, refspec);
 662}
 663
 664static int disconnect_git(struct transport *transport)
 665{
 666        free(transport->data);
 667        return 0;
 668}
 669
 670static int is_local(const char *url)
 671{
 672        const char *colon = strchr(url, ':');
 673        const char *slash = strchr(url, '/');
 674        return !colon || (slash && slash < colon);
 675}
 676
 677static int is_file(const char *url)
 678{
 679        struct stat buf;
 680        if (stat(url, &buf))
 681                return 0;
 682        return S_ISREG(buf.st_mode);
 683}
 684
 685struct transport *transport_get(struct remote *remote, const char *url)
 686{
 687        struct transport *ret = xcalloc(1, sizeof(*ret));
 688
 689        ret->remote = remote;
 690        ret->url = url;
 691
 692        if (!prefixcmp(url, "rsync://")) {
 693                ret->get_refs_list = get_refs_via_rsync;
 694                ret->fetch = fetch_objs_via_rsync;
 695                ret->push = rsync_transport_push;
 696
 697        } else if (!prefixcmp(url, "http://")
 698                || !prefixcmp(url, "https://")
 699                || !prefixcmp(url, "ftp://")) {
 700#ifdef NO_CURL
 701                error("git was compiled without libcurl support.");
 702#else
 703                ret->get_refs_list = get_refs_via_curl;
 704                ret->fetch = fetch_objs_via_curl;
 705                ret->push = curl_transport_push;
 706#endif
 707                ret->disconnect = disconnect_walker;
 708
 709        } else if (is_local(url) && is_file(url)) {
 710                struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 711                ret->data = data;
 712                ret->get_refs_list = get_refs_from_bundle;
 713                ret->fetch = fetch_refs_from_bundle;
 714                ret->disconnect = close_bundle;
 715
 716        } else {
 717                struct git_transport_data *data = xcalloc(1, sizeof(*data));
 718                ret->data = data;
 719                ret->set_option = set_git_option;
 720                ret->get_refs_list = get_refs_via_connect;
 721                ret->fetch = fetch_refs_via_pack;
 722                ret->push = git_transport_push;
 723                ret->disconnect = disconnect_git;
 724
 725                data->thin = 1;
 726                data->uploadpack = "git-upload-pack";
 727                if (remote && remote->uploadpack)
 728                        data->uploadpack = remote->uploadpack;
 729                data->receivepack = "git-receive-pack";
 730                if (remote && remote->receivepack)
 731                        data->receivepack = remote->receivepack;
 732        }
 733
 734        return ret;
 735}
 736
 737int transport_set_option(struct transport *transport,
 738                         const char *name, const char *value)
 739{
 740        if (transport->set_option)
 741                return transport->set_option(transport, name, value);
 742        return 1;
 743}
 744
 745int transport_push(struct transport *transport,
 746                   int refspec_nr, const char **refspec, int flags)
 747{
 748        if (!transport->push)
 749                return 1;
 750        return transport->push(transport, refspec_nr, refspec, flags);
 751}
 752
 753const struct ref *transport_get_remote_refs(struct transport *transport)
 754{
 755        if (!transport->remote_refs)
 756                transport->remote_refs = transport->get_refs_list(transport);
 757        return transport->remote_refs;
 758}
 759
 760int transport_fetch_refs(struct transport *transport, struct ref *refs)
 761{
 762        int rc;
 763        int nr_heads = 0, nr_alloc = 0;
 764        struct ref **heads = NULL;
 765        struct ref *rm;
 766
 767        for (rm = refs; rm; rm = rm->next) {
 768                if (rm->peer_ref &&
 769                    !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
 770                        continue;
 771                ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
 772                heads[nr_heads++] = rm;
 773        }
 774
 775        rc = transport->fetch(transport, nr_heads, heads);
 776        free(heads);
 777        return rc;
 778}
 779
 780void transport_unlock_pack(struct transport *transport)
 781{
 782        if (transport->pack_lockfile) {
 783                unlink(transport->pack_lockfile);
 784                free(transport->pack_lockfile);
 785                transport->pack_lockfile = NULL;
 786        }
 787}
 788
 789int transport_disconnect(struct transport *transport)
 790{
 791        int ret = 0;
 792        if (transport->disconnect)
 793                ret = transport->disconnect(transport);
 794        free(transport);
 795        return ret;
 796}