Andrew's git / gitweb.git / transport.c
?
transport.con commit send-pack: fix "everything up-to-date" message (73fa0b4)
   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        if (flags & TRANSPORT_PUSH_MIRROR)
 288                return error("rsync transport does not support mirror mode");
 289
 290        /* first push the objects */
 291
 292        strbuf_addstr(&buf, transport->url);
 293        strbuf_addch(&buf, '/');
 294
 295        memset(&rsync, 0, sizeof(rsync));
 296        rsync.argv = args;
 297        rsync.stdout_to_stderr = 1;
 298        i = 0;
 299        args[i++] = "rsync";
 300        args[i++] = "-a";
 301        if (flags & TRANSPORT_PUSH_DRY_RUN)
 302                args[i++] = "--dry-run";
 303        if (transport->verbose > 0)
 304                args[i++] = "-v";
 305        args[i++] = "--ignore-existing";
 306        args[i++] = "--exclude";
 307        args[i++] = "info";
 308        args[i++] = get_object_directory();
 309        args[i++] = buf.buf;
 310        args[i++] = NULL;
 311
 312        if (run_command(&rsync))
 313                return error("Could not push objects to %s", transport->url);
 314
 315        /* copy the refs to the temporary directory; they could be packed. */
 316
 317        strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 318        if (!mkdtemp(temp_dir.buf))
 319                die ("Could not make temporary directory");
 320        strbuf_addch(&temp_dir, '/');
 321
 322        if (flags & TRANSPORT_PUSH_ALL) {
 323                if (for_each_ref(write_one_ref, &temp_dir))
 324                        return -1;
 325        } else if (write_refs_to_temp_dir(&temp_dir, refspec_nr, refspec))
 326                return -1;
 327
 328        i = 2;
 329        if (flags & TRANSPORT_PUSH_DRY_RUN)
 330                args[i++] = "--dry-run";
 331        if (!(flags & TRANSPORT_PUSH_FORCE))
 332                args[i++] = "--ignore-existing";
 333        args[i++] = temp_dir.buf;
 334        args[i++] = transport->url;
 335        args[i++] = NULL;
 336        if (run_command(&rsync))
 337                result = error("Could not push to %s", transport->url);
 338
 339        if (remove_dir_recursively(&temp_dir, 0))
 340                warning ("Could not remove temporary directory %s.",
 341                                temp_dir.buf);
 342
 343        strbuf_release(&buf);
 344        strbuf_release(&temp_dir);
 345
 346        return result;
 347}
 348
 349/* Generic functions for using commit walkers */
 350
 351static int fetch_objs_via_walker(struct transport *transport,
 352                                 int nr_objs, struct ref **to_fetch)
 353{
 354        char *dest = xstrdup(transport->url);
 355        struct walker *walker = transport->data;
 356        char **objs = xmalloc(nr_objs * sizeof(*objs));
 357        int i;
 358
 359        walker->get_all = 1;
 360        walker->get_tree = 1;
 361        walker->get_history = 1;
 362        walker->get_verbosely = transport->verbose >= 0;
 363        walker->get_recover = 0;
 364
 365        for (i = 0; i < nr_objs; i++)
 366                objs[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 367
 368        if (walker_fetch(walker, nr_objs, objs, NULL, NULL))
 369                die("Fetch failed.");
 370
 371        for (i = 0; i < nr_objs; i++)
 372                free(objs[i]);
 373        free(objs);
 374        free(dest);
 375        return 0;
 376}
 377
 378static int disconnect_walker(struct transport *transport)
 379{
 380        struct walker *walker = transport->data;
 381        if (walker)
 382                walker_free(walker);
 383        return 0;
 384}
 385
 386#ifndef NO_CURL
 387static int curl_transport_push(struct transport *transport, int refspec_nr, const char **refspec, int flags)
 388{
 389        const char **argv;
 390        int argc;
 391        int err;
 392
 393        if (flags & TRANSPORT_PUSH_MIRROR)
 394                return error("http transport does not support mirror mode");
 395
 396        argv = xmalloc((refspec_nr + 12) * sizeof(char *));
 397        argv[0] = "http-push";
 398        argc = 1;
 399        if (flags & TRANSPORT_PUSH_ALL)
 400                argv[argc++] = "--all";
 401        if (flags & TRANSPORT_PUSH_FORCE)
 402                argv[argc++] = "--force";
 403        if (flags & TRANSPORT_PUSH_DRY_RUN)
 404                argv[argc++] = "--dry-run";
 405        if (flags & TRANSPORT_PUSH_VERBOSE)
 406                argv[argc++] = "--verbose";
 407        argv[argc++] = transport->url;
 408        while (refspec_nr--)
 409                argv[argc++] = *refspec++;
 410        argv[argc] = NULL;
 411        err = run_command_v_opt(argv, RUN_GIT_CMD);
 412        switch (err) {
 413        case -ERR_RUN_COMMAND_FORK:
 414                error("unable to fork for %s", argv[0]);
 415        case -ERR_RUN_COMMAND_EXEC:
 416                error("unable to exec %s", argv[0]);
 417                break;
 418        case -ERR_RUN_COMMAND_WAITPID:
 419        case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
 420        case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
 421        case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
 422                error("%s died with strange error", argv[0]);
 423        }
 424        return !!err;
 425}
 426
 427static int missing__target(int code, int result)
 428{
 429        return  /* file:// URL -- do we ever use one??? */
 430                (result == CURLE_FILE_COULDNT_READ_FILE) ||
 431                /* http:// and https:// URL */
 432                (code == 404 && result == CURLE_HTTP_RETURNED_ERROR) ||
 433                /* ftp:// URL */
 434                (code == 550 && result == CURLE_FTP_COULDNT_RETR_FILE)
 435                ;
 436}
 437
 438#define missing_target(a) missing__target((a)->http_code, (a)->curl_result)
 439
 440static struct ref *get_refs_via_curl(struct transport *transport)
 441{
 442        struct buffer buffer;
 443        char *data, *start, *mid;
 444        char *ref_name;
 445        char *refs_url;
 446        int i = 0;
 447
 448        struct active_request_slot *slot;
 449        struct slot_results results;
 450
 451        struct ref *refs = NULL;
 452        struct ref *ref = NULL;
 453        struct ref *last_ref = NULL;
 454
 455        data = xmalloc(4096);
 456        buffer.size = 4096;
 457        buffer.posn = 0;
 458        buffer.buffer = data;
 459
 460        refs_url = xmalloc(strlen(transport->url) + 11);
 461        sprintf(refs_url, "%s/info/refs", transport->url);
 462
 463        http_init();
 464
 465        slot = get_active_slot();
 466        slot->results = &results;
 467        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
 468        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 469        curl_easy_setopt(slot->curl, CURLOPT_URL, refs_url);
 470        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
 471        if (start_active_slot(slot)) {
 472                run_active_slot(slot);
 473                if (results.curl_result != CURLE_OK) {
 474                        if (missing_target(&results)) {
 475                                free(buffer.buffer);
 476                                return NULL;
 477                        } else {
 478                                free(buffer.buffer);
 479                                error("%s", curl_errorstr);
 480                                return NULL;
 481                        }
 482                }
 483        } else {
 484                free(buffer.buffer);
 485                error("Unable to start request");
 486                return NULL;
 487        }
 488
 489        http_cleanup();
 490
 491        data = buffer.buffer;
 492        start = NULL;
 493        mid = data;
 494        while (i < buffer.posn) {
 495                if (!start)
 496                        start = &data[i];
 497                if (data[i] == '\t')
 498                        mid = &data[i];
 499                if (data[i] == '\n') {
 500                        data[i] = 0;
 501                        ref_name = mid + 1;
 502                        ref = xmalloc(sizeof(struct ref) +
 503                                      strlen(ref_name) + 1);
 504                        memset(ref, 0, sizeof(struct ref));
 505                        strcpy(ref->name, ref_name);
 506                        get_sha1_hex(start, ref->old_sha1);
 507                        if (!refs)
 508                                refs = ref;
 509                        if (last_ref)
 510                                last_ref->next = ref;
 511                        last_ref = ref;
 512                        start = NULL;
 513                }
 514                i++;
 515        }
 516
 517        free(buffer.buffer);
 518
 519        return refs;
 520}
 521
 522static int fetch_objs_via_curl(struct transport *transport,
 523                                 int nr_objs, struct ref **to_fetch)
 524{
 525        if (!transport->data)
 526                transport->data = get_http_walker(transport->url);
 527        return fetch_objs_via_walker(transport, nr_objs, to_fetch);
 528}
 529
 530#endif
 531
 532struct bundle_transport_data {
 533        int fd;
 534        struct bundle_header header;
 535};
 536
 537static struct ref *get_refs_from_bundle(struct transport *transport)
 538{
 539        struct bundle_transport_data *data = transport->data;
 540        struct ref *result = NULL;
 541        int i;
 542
 543        if (data->fd > 0)
 544                close(data->fd);
 545        data->fd = read_bundle_header(transport->url, &data->header);
 546        if (data->fd < 0)
 547                die ("Could not read bundle '%s'.", transport->url);
 548        for (i = 0; i < data->header.references.nr; i++) {
 549                struct ref_list_entry *e = data->header.references.list + i;
 550                struct ref *ref = alloc_ref(strlen(e->name) + 1);
 551                hashcpy(ref->old_sha1, e->sha1);
 552                strcpy(ref->name, e->name);
 553                ref->next = result;
 554                result = ref;
 555        }
 556        return result;
 557}
 558
 559static int fetch_refs_from_bundle(struct transport *transport,
 560                               int nr_heads, struct ref **to_fetch)
 561{
 562        struct bundle_transport_data *data = transport->data;
 563        return unbundle(&data->header, data->fd);
 564}
 565
 566static int close_bundle(struct transport *transport)
 567{
 568        struct bundle_transport_data *data = transport->data;
 569        if (data->fd > 0)
 570                close(data->fd);
 571        free(data);
 572        return 0;
 573}
 574
 575struct git_transport_data {
 576        unsigned thin : 1;
 577        unsigned keep : 1;
 578        int depth;
 579        const char *uploadpack;
 580        const char *receivepack;
 581};
 582
 583static 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_KEEP)) {
 597                data->keep = !!value;
 598                return 0;
 599        } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 600                if (!value)
 601                        data->depth = 0;
 602                else
 603                        data->depth = atoi(value);
 604                return 0;
 605        }
 606        return 1;
 607}
 608
 609static struct ref *get_refs_via_connect(struct transport *transport)
 610{
 611        struct git_transport_data *data = transport->data;
 612        struct ref *refs;
 613        int fd[2];
 614        char *dest = xstrdup(transport->url);
 615        struct child_process *conn = git_connect(fd, dest, data->uploadpack, 0);
 616
 617        get_remote_heads(fd[0], &refs, 0, NULL, 0);
 618        packet_flush(fd[1]);
 619
 620        finish_connect(conn);
 621
 622        free(dest);
 623
 624        return refs;
 625}
 626
 627static int fetch_refs_via_pack(struct transport *transport,
 628                               int nr_heads, struct ref **to_fetch)
 629{
 630        struct git_transport_data *data = transport->data;
 631        char **heads = xmalloc(nr_heads * sizeof(*heads));
 632        char **origh = xmalloc(nr_heads * sizeof(*origh));
 633        struct ref *refs;
 634        char *dest = xstrdup(transport->url);
 635        struct fetch_pack_args args;
 636        int i;
 637
 638        memset(&args, 0, sizeof(args));
 639        args.uploadpack = data->uploadpack;
 640        args.keep_pack = data->keep;
 641        args.lock_pack = 1;
 642        args.use_thin_pack = data->thin;
 643        args.verbose = transport->verbose > 0;
 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        refs = fetch_pack(&args, dest, nr_heads, heads, &transport->pack_lockfile);
 649
 650        for (i = 0; i < nr_heads; i++)
 651                free(origh[i]);
 652        free(origh);
 653        free(heads);
 654        free_refs(refs);
 655        free(dest);
 656        return 0;
 657}
 658
 659static int git_transport_push(struct transport *transport, int refspec_nr, const char **refspec, int flags)
 660{
 661        struct git_transport_data *data = transport->data;
 662        struct send_pack_args args;
 663
 664        args.receivepack = data->receivepack;
 665        args.send_all = !!(flags & TRANSPORT_PUSH_ALL);
 666        args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 667        args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 668        args.use_thin_pack = data->thin;
 669        args.verbose = !!(flags & TRANSPORT_PUSH_VERBOSE);
 670        args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 671
 672        return send_pack(&args, transport->url, transport->remote, refspec_nr, refspec);
 673}
 674
 675static int disconnect_git(struct transport *transport)
 676{
 677        free(transport->data);
 678        return 0;
 679}
 680
 681static int is_local(const char *url)
 682{
 683        const char *colon = strchr(url, ':');
 684        const char *slash = strchr(url, '/');
 685        return !colon || (slash && slash < colon);
 686}
 687
 688static int is_file(const char *url)
 689{
 690        struct stat buf;
 691        if (stat(url, &buf))
 692                return 0;
 693        return S_ISREG(buf.st_mode);
 694}
 695
 696struct transport *transport_get(struct remote *remote, const char *url)
 697{
 698        struct transport *ret = xcalloc(1, sizeof(*ret));
 699
 700        ret->remote = remote;
 701        ret->url = url;
 702
 703        if (!prefixcmp(url, "rsync://")) {
 704                ret->get_refs_list = get_refs_via_rsync;
 705                ret->fetch = fetch_objs_via_rsync;
 706                ret->push = rsync_transport_push;
 707
 708        } else if (!prefixcmp(url, "http://")
 709                || !prefixcmp(url, "https://")
 710                || !prefixcmp(url, "ftp://")) {
 711#ifdef NO_CURL
 712                error("git was compiled without libcurl support.");
 713#else
 714                ret->get_refs_list = get_refs_via_curl;
 715                ret->fetch = fetch_objs_via_curl;
 716                ret->push = curl_transport_push;
 717#endif
 718                ret->disconnect = disconnect_walker;
 719
 720        } else if (is_local(url) && is_file(url)) {
 721                struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 722                ret->data = data;
 723                ret->get_refs_list = get_refs_from_bundle;
 724                ret->fetch = fetch_refs_from_bundle;
 725                ret->disconnect = close_bundle;
 726
 727        } else {
 728                struct git_transport_data *data = xcalloc(1, sizeof(*data));
 729                ret->data = data;
 730                ret->set_option = set_git_option;
 731                ret->get_refs_list = get_refs_via_connect;
 732                ret->fetch = fetch_refs_via_pack;
 733                ret->push = git_transport_push;
 734                ret->disconnect = disconnect_git;
 735
 736                data->thin = 1;
 737                data->uploadpack = "git-upload-pack";
 738                if (remote && remote->uploadpack)
 739                        data->uploadpack = remote->uploadpack;
 740                data->receivepack = "git-receive-pack";
 741                if (remote && remote->receivepack)
 742                        data->receivepack = remote->receivepack;
 743        }
 744
 745        return ret;
 746}
 747
 748int transport_set_option(struct transport *transport,
 749                         const char *name, const char *value)
 750{
 751        if (transport->set_option)
 752                return transport->set_option(transport, name, value);
 753        return 1;
 754}
 755
 756int transport_push(struct transport *transport,
 757                   int refspec_nr, const char **refspec, int flags)
 758{
 759        if (!transport->push)
 760                return 1;
 761        return transport->push(transport, refspec_nr, refspec, flags);
 762}
 763
 764const struct ref *transport_get_remote_refs(struct transport *transport)
 765{
 766        if (!transport->remote_refs)
 767                transport->remote_refs = transport->get_refs_list(transport);
 768        return transport->remote_refs;
 769}
 770
 771int transport_fetch_refs(struct transport *transport, struct ref *refs)
 772{
 773        int rc;
 774        int nr_heads = 0, nr_alloc = 0;
 775        struct ref **heads = NULL;
 776        struct ref *rm;
 777
 778        for (rm = refs; rm; rm = rm->next) {
 779                if (rm->peer_ref &&
 780                    !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
 781                        continue;
 782                ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
 783                heads[nr_heads++] = rm;
 784        }
 785
 786        rc = transport->fetch(transport, nr_heads, heads);
 787        free(heads);
 788        return rc;
 789}
 790
 791void transport_unlock_pack(struct transport *transport)
 792{
 793        if (transport->pack_lockfile) {
 794                unlink(transport->pack_lockfile);
 795                free(transport->pack_lockfile);
 796                transport->pack_lockfile = NULL;
 797        }
 798}
 799
 800int transport_disconnect(struct transport *transport)
 801{
 802        int ret = 0;
 803        if (transport->disconnect)
 804                ret = transport->disconnect(transport);
 805        free(transport);
 806        return ret;
 807}