Andrew's git / gitweb.git / transport.c
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transport.con commit t7300: fix clean up on Windows (e2c2407)
   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 (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
  99static 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
 141static const char *rsync_url(const char *url)
 142{
 143        return prefixcmp(url, "rsync://") ? skip_prefix(url, "rsync:") : url;
 144}
 145
 146static struct ref *get_refs_via_rsync(struct transport *transport)
 147{
 148        struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 149        struct ref dummy, *tail = &dummy;
 150        struct child_process rsync;
 151        const char *args[5];
 152        int temp_dir_len;
 153
 154        /* copy the refs to the temporary directory */
 155
 156        strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 157        if (!mkdtemp(temp_dir.buf))
 158                die ("Could not make temporary directory");
 159        temp_dir_len = temp_dir.len;
 160
 161        strbuf_addstr(&buf, rsync_url(transport->url));
 162        strbuf_addstr(&buf, "/refs");
 163
 164        memset(&rsync, 0, sizeof(rsync));
 165        rsync.argv = args;
 166        rsync.stdout_to_stderr = 1;
 167        args[0] = "rsync";
 168        args[1] = (transport->verbose > 0) ? "-rv" : "-r";
 169        args[2] = buf.buf;
 170        args[3] = temp_dir.buf;
 171        args[4] = NULL;
 172
 173        if (run_command(&rsync))
 174                die ("Could not run rsync to get refs");
 175
 176        strbuf_reset(&buf);
 177        strbuf_addstr(&buf, rsync_url(transport->url));
 178        strbuf_addstr(&buf, "/packed-refs");
 179
 180        args[2] = buf.buf;
 181
 182        if (run_command(&rsync))
 183                die ("Could not run rsync to get refs");
 184
 185        /* read the copied refs */
 186
 187        strbuf_addstr(&temp_dir, "/refs");
 188        read_loose_refs(&temp_dir, temp_dir_len + 1, &tail);
 189        strbuf_setlen(&temp_dir, temp_dir_len);
 190
 191        tail = &dummy;
 192        strbuf_addstr(&temp_dir, "/packed-refs");
 193        insert_packed_refs(temp_dir.buf, &tail);
 194        strbuf_setlen(&temp_dir, temp_dir_len);
 195
 196        if (remove_dir_recursively(&temp_dir, 0))
 197                warning ("Error removing temporary directory %s.",
 198                                temp_dir.buf);
 199
 200        strbuf_release(&buf);
 201        strbuf_release(&temp_dir);
 202
 203        return dummy.next;
 204}
 205
 206static int fetch_objs_via_rsync(struct transport *transport,
 207                                int nr_objs, const struct ref **to_fetch)
 208{
 209        struct strbuf buf = STRBUF_INIT;
 210        struct child_process rsync;
 211        const char *args[8];
 212        int result;
 213
 214        strbuf_addstr(&buf, rsync_url(transport->url));
 215        strbuf_addstr(&buf, "/objects/");
 216
 217        memset(&rsync, 0, sizeof(rsync));
 218        rsync.argv = args;
 219        rsync.stdout_to_stderr = 1;
 220        args[0] = "rsync";
 221        args[1] = (transport->verbose > 0) ? "-rv" : "-r";
 222        args[2] = "--ignore-existing";
 223        args[3] = "--exclude";
 224        args[4] = "info";
 225        args[5] = buf.buf;
 226        args[6] = get_object_directory();
 227        args[7] = NULL;
 228
 229        /* NEEDSWORK: handle one level of alternates */
 230        result = run_command(&rsync);
 231
 232        strbuf_release(&buf);
 233
 234        return result;
 235}
 236
 237static int write_one_ref(const char *name, const unsigned char *sha1,
 238                int flags, void *data)
 239{
 240        struct strbuf *buf = data;
 241        int len = buf->len;
 242        FILE *f;
 243
 244        /* when called via for_each_ref(), flags is non-zero */
 245        if (flags && prefixcmp(name, "refs/heads/") &&
 246                        prefixcmp(name, "refs/tags/"))
 247                return 0;
 248
 249        strbuf_addstr(buf, name);
 250        if (safe_create_leading_directories(buf->buf) ||
 251                        !(f = fopen(buf->buf, "w")) ||
 252                        fprintf(f, "%s\n", sha1_to_hex(sha1)) < 0 ||
 253                        fclose(f))
 254                return error("problems writing temporary file %s", buf->buf);
 255        strbuf_setlen(buf, len);
 256        return 0;
 257}
 258
 259static int write_refs_to_temp_dir(struct strbuf *temp_dir,
 260                int refspec_nr, const char **refspec)
 261{
 262        int i;
 263
 264        for (i = 0; i < refspec_nr; i++) {
 265                unsigned char sha1[20];
 266                char *ref;
 267
 268                if (dwim_ref(refspec[i], strlen(refspec[i]), sha1, &ref) != 1)
 269                        return error("Could not get ref %s", refspec[i]);
 270
 271                if (write_one_ref(ref, sha1, 0, temp_dir)) {
 272                        free(ref);
 273                        return -1;
 274                }
 275                free(ref);
 276        }
 277        return 0;
 278}
 279
 280static int rsync_transport_push(struct transport *transport,
 281                int refspec_nr, const char **refspec, int flags)
 282{
 283        struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 284        int result = 0, i;
 285        struct child_process rsync;
 286        const char *args[10];
 287
 288        if (flags & TRANSPORT_PUSH_MIRROR)
 289                return error("rsync transport does not support mirror mode");
 290
 291        /* first push the objects */
 292
 293        strbuf_addstr(&buf, rsync_url(transport->url));
 294        strbuf_addch(&buf, '/');
 295
 296        memset(&rsync, 0, sizeof(rsync));
 297        rsync.argv = args;
 298        rsync.stdout_to_stderr = 1;
 299        i = 0;
 300        args[i++] = "rsync";
 301        args[i++] = "-a";
 302        if (flags & TRANSPORT_PUSH_DRY_RUN)
 303                args[i++] = "--dry-run";
 304        if (transport->verbose > 0)
 305                args[i++] = "-v";
 306        args[i++] = "--ignore-existing";
 307        args[i++] = "--exclude";
 308        args[i++] = "info";
 309        args[i++] = get_object_directory();
 310        args[i++] = buf.buf;
 311        args[i++] = NULL;
 312
 313        if (run_command(&rsync))
 314                return error("Could not push objects to %s",
 315                                rsync_url(transport->url));
 316
 317        /* copy the refs to the temporary directory; they could be packed. */
 318
 319        strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 320        if (!mkdtemp(temp_dir.buf))
 321                die ("Could not make temporary directory");
 322        strbuf_addch(&temp_dir, '/');
 323
 324        if (flags & TRANSPORT_PUSH_ALL) {
 325                if (for_each_ref(write_one_ref, &temp_dir))
 326                        return -1;
 327        } else if (write_refs_to_temp_dir(&temp_dir, refspec_nr, refspec))
 328                return -1;
 329
 330        i = 2;
 331        if (flags & TRANSPORT_PUSH_DRY_RUN)
 332                args[i++] = "--dry-run";
 333        if (!(flags & TRANSPORT_PUSH_FORCE))
 334                args[i++] = "--ignore-existing";
 335        args[i++] = temp_dir.buf;
 336        args[i++] = rsync_url(transport->url);
 337        args[i++] = NULL;
 338        if (run_command(&rsync))
 339                result = error("Could not push to %s",
 340                                rsync_url(transport->url));
 341
 342        if (remove_dir_recursively(&temp_dir, 0))
 343                warning ("Could not remove temporary directory %s.",
 344                                temp_dir.buf);
 345
 346        strbuf_release(&buf);
 347        strbuf_release(&temp_dir);
 348
 349        return result;
 350}
 351
 352/* Generic functions for using commit walkers */
 353
 354#ifndef NO_CURL /* http fetch is the only user */
 355static int fetch_objs_via_walker(struct transport *transport,
 356                                 int nr_objs, const struct ref **to_fetch)
 357{
 358        char *dest = xstrdup(transport->url);
 359        struct walker *walker = transport->data;
 360        char **objs = xmalloc(nr_objs * sizeof(*objs));
 361        int i;
 362
 363        walker->get_all = 1;
 364        walker->get_tree = 1;
 365        walker->get_history = 1;
 366        walker->get_verbosely = transport->verbose >= 0;
 367        walker->get_recover = 0;
 368
 369        for (i = 0; i < nr_objs; i++)
 370                objs[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 371
 372        if (walker_fetch(walker, nr_objs, objs, NULL, NULL))
 373                die("Fetch failed.");
 374
 375        for (i = 0; i < nr_objs; i++)
 376                free(objs[i]);
 377        free(objs);
 378        free(dest);
 379        return 0;
 380}
 381#endif /* NO_CURL */
 382
 383static int disconnect_walker(struct transport *transport)
 384{
 385        struct walker *walker = transport->data;
 386        if (walker)
 387                walker_free(walker);
 388        return 0;
 389}
 390
 391#ifndef NO_CURL
 392static int curl_transport_push(struct transport *transport, int refspec_nr, const char **refspec, int flags)
 393{
 394        const char **argv;
 395        int argc;
 396        int err;
 397
 398        if (flags & TRANSPORT_PUSH_MIRROR)
 399                return error("http transport does not support mirror mode");
 400
 401        argv = xmalloc((refspec_nr + 12) * sizeof(char *));
 402        argv[0] = "http-push";
 403        argc = 1;
 404        if (flags & TRANSPORT_PUSH_ALL)
 405                argv[argc++] = "--all";
 406        if (flags & TRANSPORT_PUSH_FORCE)
 407                argv[argc++] = "--force";
 408        if (flags & TRANSPORT_PUSH_DRY_RUN)
 409                argv[argc++] = "--dry-run";
 410        if (flags & TRANSPORT_PUSH_VERBOSE)
 411                argv[argc++] = "--verbose";
 412        argv[argc++] = transport->url;
 413        while (refspec_nr--)
 414                argv[argc++] = *refspec++;
 415        argv[argc] = NULL;
 416        err = run_command_v_opt(argv, RUN_GIT_CMD);
 417        switch (err) {
 418        case -ERR_RUN_COMMAND_FORK:
 419                error("unable to fork for %s", argv[0]);
 420        case -ERR_RUN_COMMAND_EXEC:
 421                error("unable to exec %s", argv[0]);
 422                break;
 423        case -ERR_RUN_COMMAND_WAITPID:
 424        case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
 425        case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
 426        case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
 427                error("%s died with strange error", argv[0]);
 428        }
 429        return !!err;
 430}
 431
 432static struct ref *get_refs_via_curl(struct transport *transport)
 433{
 434        struct strbuf buffer = STRBUF_INIT;
 435        char *data, *start, *mid;
 436        char *ref_name;
 437        char *refs_url;
 438        int i = 0;
 439
 440        struct active_request_slot *slot;
 441        struct slot_results results;
 442
 443        struct ref *refs = NULL;
 444        struct ref *ref = NULL;
 445        struct ref *last_ref = NULL;
 446
 447        struct walker *walker;
 448
 449        if (!transport->data)
 450                transport->data = get_http_walker(transport->url,
 451                                                transport->remote);
 452
 453        walker = transport->data;
 454
 455        refs_url = xmalloc(strlen(transport->url) + 11);
 456        sprintf(refs_url, "%s/info/refs", transport->url);
 457
 458        slot = get_active_slot();
 459        slot->results = &results;
 460        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
 461        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 462        curl_easy_setopt(slot->curl, CURLOPT_URL, refs_url);
 463        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
 464
 465        if (start_active_slot(slot)) {
 466                run_active_slot(slot);
 467                if (results.curl_result != CURLE_OK) {
 468                        strbuf_release(&buffer);
 469                        if (missing_target(&results))
 470                                die("%s not found: did you run git update-server-info on the server?", refs_url);
 471                        else
 472                                die("%s download error - %s", refs_url, curl_errorstr);
 473                }
 474        } else {
 475                strbuf_release(&buffer);
 476                die("Unable to start HTTP request");
 477        }
 478
 479        data = buffer.buf;
 480        start = NULL;
 481        mid = data;
 482        while (i < buffer.len) {
 483                if (!start)
 484                        start = &data[i];
 485                if (data[i] == '\t')
 486                        mid = &data[i];
 487                if (data[i] == '\n') {
 488                        data[i] = 0;
 489                        ref_name = mid + 1;
 490                        ref = xmalloc(sizeof(struct ref) +
 491                                      strlen(ref_name) + 1);
 492                        memset(ref, 0, sizeof(struct ref));
 493                        strcpy(ref->name, ref_name);
 494                        get_sha1_hex(start, ref->old_sha1);
 495                        if (!refs)
 496                                refs = ref;
 497                        if (last_ref)
 498                                last_ref->next = ref;
 499                        last_ref = ref;
 500                        start = NULL;
 501                }
 502                i++;
 503        }
 504
 505        strbuf_release(&buffer);
 506
 507        ref = alloc_ref("HEAD");
 508        if (!walker->fetch_ref(walker, ref) &&
 509            !resolve_remote_symref(ref, refs)) {
 510                ref->next = refs;
 511                refs = ref;
 512        } else {
 513                free(ref);
 514        }
 515
 516        return refs;
 517}
 518
 519static int fetch_objs_via_curl(struct transport *transport,
 520                                 int nr_objs, const struct ref **to_fetch)
 521{
 522        if (!transport->data)
 523                transport->data = get_http_walker(transport->url,
 524                                                transport->remote);
 525        return fetch_objs_via_walker(transport, nr_objs, to_fetch);
 526}
 527
 528#endif
 529
 530struct bundle_transport_data {
 531        int fd;
 532        struct bundle_header header;
 533};
 534
 535static struct ref *get_refs_from_bundle(struct transport *transport)
 536{
 537        struct bundle_transport_data *data = transport->data;
 538        struct ref *result = NULL;
 539        int i;
 540
 541        if (data->fd > 0)
 542                close(data->fd);
 543        data->fd = read_bundle_header(transport->url, &data->header);
 544        if (data->fd < 0)
 545                die ("Could not read bundle '%s'.", transport->url);
 546        for (i = 0; i < data->header.references.nr; i++) {
 547                struct ref_list_entry *e = data->header.references.list + i;
 548                struct ref *ref = alloc_ref(e->name);
 549                hashcpy(ref->old_sha1, e->sha1);
 550                ref->next = result;
 551                result = ref;
 552        }
 553        return result;
 554}
 555
 556static int fetch_refs_from_bundle(struct transport *transport,
 557                               int nr_heads, const struct ref **to_fetch)
 558{
 559        struct bundle_transport_data *data = transport->data;
 560        return unbundle(&data->header, data->fd);
 561}
 562
 563static int close_bundle(struct transport *transport)
 564{
 565        struct bundle_transport_data *data = transport->data;
 566        if (data->fd > 0)
 567                close(data->fd);
 568        free(data);
 569        return 0;
 570}
 571
 572struct git_transport_data {
 573        unsigned thin : 1;
 574        unsigned keep : 1;
 575        unsigned followtags : 1;
 576        int depth;
 577        struct child_process *conn;
 578        int fd[2];
 579        const char *uploadpack;
 580        const char *receivepack;
 581};
 582
 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_FOLLOWTAGS)) {
 597                data->followtags = !!value;
 598                return 0;
 599        } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 600                data->keep = !!value;
 601                return 0;
 602        } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 603                if (!value)
 604                        data->depth = 0;
 605                else
 606                        data->depth = atoi(value);
 607                return 0;
 608        }
 609        return 1;
 610}
 611
 612static int connect_setup(struct transport *transport)
 613{
 614        struct git_transport_data *data = transport->data;
 615        data->conn = git_connect(data->fd, transport->url, data->uploadpack, 0);
 616        return 0;
 617}
 618
 619static struct ref *get_refs_via_connect(struct transport *transport)
 620{
 621        struct git_transport_data *data = transport->data;
 622        struct ref *refs;
 623
 624        connect_setup(transport);
 625        get_remote_heads(data->fd[0], &refs, 0, NULL, 0, NULL);
 626
 627        return refs;
 628}
 629
 630static int fetch_refs_via_pack(struct transport *transport,
 631                               int nr_heads, const struct ref **to_fetch)
 632{
 633        struct git_transport_data *data = transport->data;
 634        char **heads = xmalloc(nr_heads * sizeof(*heads));
 635        char **origh = xmalloc(nr_heads * sizeof(*origh));
 636        const struct ref *refs;
 637        char *dest = xstrdup(transport->url);
 638        struct fetch_pack_args args;
 639        int i;
 640        struct ref *refs_tmp = NULL;
 641
 642        memset(&args, 0, sizeof(args));
 643        args.uploadpack = data->uploadpack;
 644        args.keep_pack = data->keep;
 645        args.lock_pack = 1;
 646        args.use_thin_pack = data->thin;
 647        args.include_tag = data->followtags;
 648        args.verbose = (transport->verbose > 0);
 649        args.quiet = (transport->verbose < 0);
 650        args.no_progress = args.quiet || (!transport->progress && !isatty(1));
 651        args.depth = data->depth;
 652
 653        for (i = 0; i < nr_heads; i++)
 654                origh[i] = heads[i] = xstrdup(to_fetch[i]->name);
 655
 656        if (!data->conn) {
 657                connect_setup(transport);
 658                get_remote_heads(data->fd[0], &refs_tmp, 0, NULL, 0, NULL);
 659        }
 660
 661        refs = fetch_pack(&args, data->fd, data->conn,
 662                          refs_tmp ? refs_tmp : transport->remote_refs,
 663                          dest, nr_heads, heads, &transport->pack_lockfile);
 664        close(data->fd[0]);
 665        close(data->fd[1]);
 666        if (finish_connect(data->conn))
 667                refs = NULL;
 668        data->conn = NULL;
 669
 670        free_refs(refs_tmp);
 671
 672        for (i = 0; i < nr_heads; i++)
 673                free(origh[i]);
 674        free(origh);
 675        free(heads);
 676        free(dest);
 677        return (refs ? 0 : -1);
 678}
 679
 680static int git_transport_push(struct transport *transport, int refspec_nr, const char **refspec, int flags)
 681{
 682        struct git_transport_data *data = transport->data;
 683        struct send_pack_args args;
 684
 685        args.receivepack = data->receivepack;
 686        args.send_all = !!(flags & TRANSPORT_PUSH_ALL);
 687        args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 688        args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 689        args.use_thin_pack = data->thin;
 690        args.verbose = !!(flags & TRANSPORT_PUSH_VERBOSE);
 691        args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 692
 693        return send_pack(&args, transport->url, transport->remote, refspec_nr, refspec);
 694}
 695
 696static int disconnect_git(struct transport *transport)
 697{
 698        struct git_transport_data *data = transport->data;
 699        if (data->conn) {
 700                packet_flush(data->fd[1]);
 701                close(data->fd[0]);
 702                close(data->fd[1]);
 703                finish_connect(data->conn);
 704        }
 705
 706        free(data);
 707        return 0;
 708}
 709
 710static int is_local(const char *url)
 711{
 712        const char *colon = strchr(url, ':');
 713        const char *slash = strchr(url, '/');
 714        return !colon || (slash && slash < colon) ||
 715                has_dos_drive_prefix(url);
 716}
 717
 718static int is_file(const char *url)
 719{
 720        struct stat buf;
 721        if (stat(url, &buf))
 722                return 0;
 723        return S_ISREG(buf.st_mode);
 724}
 725
 726struct transport *transport_get(struct remote *remote, const char *url)
 727{
 728        struct transport *ret = xcalloc(1, sizeof(*ret));
 729
 730        ret->remote = remote;
 731        ret->url = url;
 732
 733        if (!prefixcmp(url, "rsync:")) {
 734                ret->get_refs_list = get_refs_via_rsync;
 735                ret->fetch = fetch_objs_via_rsync;
 736                ret->push = rsync_transport_push;
 737
 738        } else if (!prefixcmp(url, "http://")
 739                || !prefixcmp(url, "https://")
 740                || !prefixcmp(url, "ftp://")) {
 741#ifdef NO_CURL
 742                error("git was compiled without libcurl support.");
 743#else
 744                ret->get_refs_list = get_refs_via_curl;
 745                ret->fetch = fetch_objs_via_curl;
 746                ret->push = curl_transport_push;
 747#endif
 748                ret->disconnect = disconnect_walker;
 749
 750        } else if (is_local(url) && is_file(url)) {
 751                struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 752                ret->data = data;
 753                ret->get_refs_list = get_refs_from_bundle;
 754                ret->fetch = fetch_refs_from_bundle;
 755                ret->disconnect = close_bundle;
 756
 757        } else {
 758                struct git_transport_data *data = xcalloc(1, sizeof(*data));
 759                ret->data = data;
 760                ret->set_option = set_git_option;
 761                ret->get_refs_list = get_refs_via_connect;
 762                ret->fetch = fetch_refs_via_pack;
 763                ret->push = git_transport_push;
 764                ret->disconnect = disconnect_git;
 765
 766                data->thin = 1;
 767                data->conn = NULL;
 768                data->uploadpack = "git-upload-pack";
 769                if (remote && remote->uploadpack)
 770                        data->uploadpack = remote->uploadpack;
 771                data->receivepack = "git-receive-pack";
 772                if (remote && remote->receivepack)
 773                        data->receivepack = remote->receivepack;
 774        }
 775
 776        return ret;
 777}
 778
 779int transport_set_option(struct transport *transport,
 780                         const char *name, const char *value)
 781{
 782        if (transport->set_option)
 783                return transport->set_option(transport, name, value);
 784        return 1;
 785}
 786
 787int transport_push(struct transport *transport,
 788                   int refspec_nr, const char **refspec, int flags)
 789{
 790        if (!transport->push)
 791                return 1;
 792        return transport->push(transport, refspec_nr, refspec, flags);
 793}
 794
 795const struct ref *transport_get_remote_refs(struct transport *transport)
 796{
 797        if (!transport->remote_refs)
 798                transport->remote_refs = transport->get_refs_list(transport);
 799        return transport->remote_refs;
 800}
 801
 802int transport_fetch_refs(struct transport *transport, const struct ref *refs)
 803{
 804        int rc;
 805        int nr_heads = 0, nr_alloc = 0;
 806        const struct ref **heads = NULL;
 807        const struct ref *rm;
 808
 809        for (rm = refs; rm; rm = rm->next) {
 810                if (rm->peer_ref &&
 811                    !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
 812                        continue;
 813                ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
 814                heads[nr_heads++] = rm;
 815        }
 816
 817        rc = transport->fetch(transport, nr_heads, heads);
 818        free(heads);
 819        return rc;
 820}
 821
 822void transport_unlock_pack(struct transport *transport)
 823{
 824        if (transport->pack_lockfile) {
 825                unlink(transport->pack_lockfile);
 826                free(transport->pack_lockfile);
 827                transport->pack_lockfile = NULL;
 828        }
 829}
 830
 831int transport_disconnect(struct transport *transport)
 832{
 833        int ret = 0;
 834        if (transport->disconnect)
 835                ret = transport->disconnect(transport);
 836        free(transport);
 837        return ret;
 838}