Andrew's git / gitweb.git / transport.c
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transport.con commit Merge branch 'master' into db/fetch-pack (2e13e5d)
   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
  25static 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
  35static 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
 101static 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, 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
 144static 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
 204static 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
 235static 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
 257static 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
 278static 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[8];
 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        args[0] = "rsync";
 295        args[1] = (transport->verbose > 0) ? "-av" : "-a";
 296        args[2] = "--ignore-existing";
 297        args[3] = "--exclude";
 298        args[4] = "info";
 299        args[5] = get_object_directory();;
 300        args[6] = buf.buf;
 301        args[7] = NULL;
 302
 303        if (run_command(&rsync))
 304                return error("Could not push objects to %s", transport->url);
 305
 306        /* copy the refs to the temporary directory; they could be packed. */
 307
 308        strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 309        if (!mkdtemp(temp_dir.buf))
 310                die ("Could not make temporary directory");
 311        strbuf_addch(&temp_dir, '/');
 312
 313        if (flags & TRANSPORT_PUSH_ALL) {
 314                if (for_each_ref(write_one_ref, &temp_dir))
 315                        return -1;
 316        } else if (write_refs_to_temp_dir(&temp_dir, refspec_nr, refspec))
 317                return -1;
 318
 319        i = (flags & TRANSPORT_PUSH_FORCE) ? 2 : 3;
 320        args[i++] = temp_dir.buf;
 321        args[i++] = transport->url;
 322        args[i++] = NULL;
 323        if (run_command(&rsync))
 324                result = error("Could not push to %s", transport->url);
 325
 326        if (remove_dir_recursively(&temp_dir, 0))
 327                warning ("Could not remove temporary directory %s.",
 328                                temp_dir.buf);
 329
 330        strbuf_release(&buf);
 331        strbuf_release(&temp_dir);
 332
 333        return result;
 334}
 335
 336/* Generic functions for using commit walkers */
 337
 338static int fetch_objs_via_walker(struct transport *transport,
 339                                 int nr_objs, struct ref **to_fetch)
 340{
 341        char *dest = xstrdup(transport->url);
 342        struct walker *walker = transport->data;
 343        char **objs = xmalloc(nr_objs * sizeof(*objs));
 344        int i;
 345
 346        walker->get_all = 1;
 347        walker->get_tree = 1;
 348        walker->get_history = 1;
 349        walker->get_verbosely = transport->verbose >= 0;
 350        walker->get_recover = 0;
 351
 352        for (i = 0; i < nr_objs; i++)
 353                objs[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 354
 355        if (walker_fetch(walker, nr_objs, objs, NULL, NULL))
 356                die("Fetch failed.");
 357
 358        for (i = 0; i < nr_objs; i++)
 359                free(objs[i]);
 360        free(objs);
 361        free(dest);
 362        return 0;
 363}
 364
 365static int disconnect_walker(struct transport *transport)
 366{
 367        struct walker *walker = transport->data;
 368        if (walker)
 369                walker_free(walker);
 370        return 0;
 371}
 372
 373#ifndef NO_CURL
 374static int curl_transport_push(struct transport *transport, int refspec_nr, const char **refspec, int flags) {
 375        const char **argv;
 376        int argc;
 377        int err;
 378
 379        argv = xmalloc((refspec_nr + 11) * sizeof(char *));
 380        argv[0] = "http-push";
 381        argc = 1;
 382        if (flags & TRANSPORT_PUSH_ALL)
 383                argv[argc++] = "--all";
 384        if (flags & TRANSPORT_PUSH_FORCE)
 385                argv[argc++] = "--force";
 386        argv[argc++] = transport->url;
 387        while (refspec_nr--)
 388                argv[argc++] = *refspec++;
 389        argv[argc] = NULL;
 390        err = run_command_v_opt(argv, RUN_GIT_CMD);
 391        switch (err) {
 392        case -ERR_RUN_COMMAND_FORK:
 393                error("unable to fork for %s", argv[0]);
 394        case -ERR_RUN_COMMAND_EXEC:
 395                error("unable to exec %s", argv[0]);
 396                break;
 397        case -ERR_RUN_COMMAND_WAITPID:
 398        case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
 399        case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
 400        case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
 401                error("%s died with strange error", argv[0]);
 402        }
 403        return !!err;
 404}
 405
 406static int missing__target(int code, int result)
 407{
 408        return  /* file:// URL -- do we ever use one??? */
 409                (result == CURLE_FILE_COULDNT_READ_FILE) ||
 410                /* http:// and https:// URL */
 411                (code == 404 && result == CURLE_HTTP_RETURNED_ERROR) ||
 412                /* ftp:// URL */
 413                (code == 550 && result == CURLE_FTP_COULDNT_RETR_FILE)
 414                ;
 415}
 416
 417#define missing_target(a) missing__target((a)->http_code, (a)->curl_result)
 418
 419static struct ref *get_refs_via_curl(const struct transport *transport)
 420{
 421        struct buffer buffer;
 422        char *data, *start, *mid;
 423        char *ref_name;
 424        char *refs_url;
 425        int i = 0;
 426
 427        struct active_request_slot *slot;
 428        struct slot_results results;
 429
 430        struct ref *refs = NULL;
 431        struct ref *ref = NULL;
 432        struct ref *last_ref = NULL;
 433
 434        data = xmalloc(4096);
 435        buffer.size = 4096;
 436        buffer.posn = 0;
 437        buffer.buffer = data;
 438
 439        refs_url = xmalloc(strlen(transport->url) + 11);
 440        sprintf(refs_url, "%s/info/refs", transport->url);
 441
 442        http_init();
 443
 444        slot = get_active_slot();
 445        slot->results = &results;
 446        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
 447        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 448        curl_easy_setopt(slot->curl, CURLOPT_URL, refs_url);
 449        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
 450        if (start_active_slot(slot)) {
 451                run_active_slot(slot);
 452                if (results.curl_result != CURLE_OK) {
 453                        if (missing_target(&results)) {
 454                                free(buffer.buffer);
 455                                return NULL;
 456                        } else {
 457                                free(buffer.buffer);
 458                                error("%s", curl_errorstr);
 459                                return NULL;
 460                        }
 461                }
 462        } else {
 463                free(buffer.buffer);
 464                error("Unable to start request");
 465                return NULL;
 466        }
 467
 468        http_cleanup();
 469
 470        data = buffer.buffer;
 471        start = NULL;
 472        mid = data;
 473        while (i < buffer.posn) {
 474                if (!start)
 475                        start = &data[i];
 476                if (data[i] == '\t')
 477                        mid = &data[i];
 478                if (data[i] == '\n') {
 479                        data[i] = 0;
 480                        ref_name = mid + 1;
 481                        ref = xmalloc(sizeof(struct ref) +
 482                                      strlen(ref_name) + 1);
 483                        memset(ref, 0, sizeof(struct ref));
 484                        strcpy(ref->name, ref_name);
 485                        get_sha1_hex(start, ref->old_sha1);
 486                        if (!refs)
 487                                refs = ref;
 488                        if (last_ref)
 489                                last_ref->next = ref;
 490                        last_ref = ref;
 491                        start = NULL;
 492                }
 493                i++;
 494        }
 495
 496        free(buffer.buffer);
 497
 498        return refs;
 499}
 500
 501static int fetch_objs_via_curl(struct transport *transport,
 502                                 int nr_objs, struct ref **to_fetch)
 503{
 504        if (!transport->data)
 505                transport->data = get_http_walker(transport->url);
 506        return fetch_objs_via_walker(transport, nr_objs, to_fetch);
 507}
 508
 509#endif
 510
 511struct bundle_transport_data {
 512        int fd;
 513        struct bundle_header header;
 514};
 515
 516static struct ref *get_refs_from_bundle(const struct transport *transport)
 517{
 518        struct bundle_transport_data *data = transport->data;
 519        struct ref *result = NULL;
 520        int i;
 521
 522        if (data->fd > 0)
 523                close(data->fd);
 524        data->fd = read_bundle_header(transport->url, &data->header);
 525        if (data->fd < 0)
 526                die ("Could not read bundle '%s'.", transport->url);
 527        for (i = 0; i < data->header.references.nr; i++) {
 528                struct ref_list_entry *e = data->header.references.list + i;
 529                struct ref *ref = alloc_ref(strlen(e->name) + 1);
 530                hashcpy(ref->old_sha1, e->sha1);
 531                strcpy(ref->name, e->name);
 532                ref->next = result;
 533                result = ref;
 534        }
 535        return result;
 536}
 537
 538static int fetch_refs_from_bundle(struct transport *transport,
 539                               int nr_heads, struct ref **to_fetch)
 540{
 541        struct bundle_transport_data *data = transport->data;
 542        return unbundle(&data->header, data->fd);
 543}
 544
 545static int close_bundle(struct transport *transport)
 546{
 547        struct bundle_transport_data *data = transport->data;
 548        if (data->fd > 0)
 549                close(data->fd);
 550        free(data);
 551        return 0;
 552}
 553
 554struct git_transport_data {
 555        unsigned thin : 1;
 556        unsigned keep : 1;
 557        int depth;
 558        const char *uploadpack;
 559        const char *receivepack;
 560};
 561
 562static int set_git_option(struct transport *connection,
 563                          const char *name, const char *value)
 564{
 565        struct git_transport_data *data = connection->data;
 566        if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 567                data->uploadpack = value;
 568                return 0;
 569        } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 570                data->receivepack = value;
 571                return 0;
 572        } else if (!strcmp(name, TRANS_OPT_THIN)) {
 573                data->thin = !!value;
 574                return 0;
 575        } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 576                data->keep = !!value;
 577                return 0;
 578        } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 579                if (!value)
 580                        data->depth = 0;
 581                else
 582                        data->depth = atoi(value);
 583                return 0;
 584        }
 585        return 1;
 586}
 587
 588static struct ref *get_refs_via_connect(const struct transport *transport)
 589{
 590        struct git_transport_data *data = transport->data;
 591        struct ref *refs;
 592        int fd[2];
 593        pid_t pid;
 594        char *dest = xstrdup(transport->url);
 595
 596        pid = git_connect(fd, dest, data->uploadpack, 0);
 597
 598        if (pid < 0)
 599                die("Failed to connect to \"%s\"", transport->url);
 600
 601        get_remote_heads(fd[0], &refs, 0, NULL, 0);
 602        packet_flush(fd[1]);
 603
 604        finish_connect(pid);
 605
 606        free(dest);
 607
 608        return refs;
 609}
 610
 611static int fetch_refs_via_pack(struct transport *transport,
 612                               int nr_heads, struct ref **to_fetch)
 613{
 614        struct git_transport_data *data = transport->data;
 615        char **heads = xmalloc(nr_heads * sizeof(*heads));
 616        char **origh = xmalloc(nr_heads * sizeof(*origh));
 617        struct ref *refs;
 618        char *dest = xstrdup(transport->url);
 619        struct fetch_pack_args args;
 620        int i;
 621
 622        memset(&args, 0, sizeof(args));
 623        args.uploadpack = data->uploadpack;
 624        args.keep_pack = data->keep;
 625        args.lock_pack = 1;
 626        args.use_thin_pack = data->thin;
 627        args.verbose = transport->verbose > 0;
 628        args.depth = data->depth;
 629
 630        for (i = 0; i < nr_heads; i++)
 631                origh[i] = heads[i] = xstrdup(to_fetch[i]->name);
 632        refs = fetch_pack(&args, dest, nr_heads, heads, &transport->pack_lockfile);
 633
 634        for (i = 0; i < nr_heads; i++)
 635                free(origh[i]);
 636        free(origh);
 637        free(heads);
 638        free_refs(refs);
 639        free(dest);
 640        return 0;
 641}
 642
 643static int git_transport_push(struct transport *transport, int refspec_nr, const char **refspec, int flags) {
 644        struct git_transport_data *data = transport->data;
 645        const char **argv;
 646        char *rem;
 647        int argc;
 648        int err;
 649
 650        argv = xmalloc((refspec_nr + 11) * sizeof(char *));
 651        argv[0] = "send-pack";
 652        argc = 1;
 653        if (flags & TRANSPORT_PUSH_ALL)
 654                argv[argc++] = "--all";
 655        if (flags & TRANSPORT_PUSH_FORCE)
 656                argv[argc++] = "--force";
 657        if (flags & TRANSPORT_PUSH_DRY_RUN)
 658                argv[argc++] = "--dry-run";
 659        if (data->receivepack) {
 660                char *rp = xmalloc(strlen(data->receivepack) + 16);
 661                sprintf(rp, "--receive-pack=%s", data->receivepack);
 662                argv[argc++] = rp;
 663        }
 664        if (data->thin)
 665                argv[argc++] = "--thin";
 666        rem = xmalloc(strlen(transport->remote->name) + 10);
 667        sprintf(rem, "--remote=%s", transport->remote->name);
 668        argv[argc++] = rem;
 669        argv[argc++] = transport->url;
 670        while (refspec_nr--)
 671                argv[argc++] = *refspec++;
 672        argv[argc] = NULL;
 673        err = run_command_v_opt(argv, RUN_GIT_CMD);
 674        switch (err) {
 675        case -ERR_RUN_COMMAND_FORK:
 676                error("unable to fork for %s", argv[0]);
 677        case -ERR_RUN_COMMAND_EXEC:
 678                error("unable to exec %s", argv[0]);
 679                break;
 680        case -ERR_RUN_COMMAND_WAITPID:
 681        case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
 682        case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
 683        case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
 684                error("%s died with strange error", argv[0]);
 685        }
 686        return !!err;
 687}
 688
 689static int disconnect_git(struct transport *transport)
 690{
 691        free(transport->data);
 692        return 0;
 693}
 694
 695static int is_local(const char *url)
 696{
 697        const char *colon = strchr(url, ':');
 698        const char *slash = strchr(url, '/');
 699        return !colon || (slash && slash < colon);
 700}
 701
 702static int is_file(const char *url)
 703{
 704        struct stat buf;
 705        if (stat(url, &buf))
 706                return 0;
 707        return S_ISREG(buf.st_mode);
 708}
 709
 710struct transport *transport_get(struct remote *remote, const char *url)
 711{
 712        struct transport *ret = xcalloc(1, sizeof(*ret));
 713
 714        ret->remote = remote;
 715        ret->url = url;
 716
 717        if (!prefixcmp(url, "rsync://")) {
 718                ret->get_refs_list = get_refs_via_rsync;
 719                ret->fetch = fetch_objs_via_rsync;
 720                ret->push = rsync_transport_push;
 721
 722        } else if (!prefixcmp(url, "http://")
 723                || !prefixcmp(url, "https://")
 724                || !prefixcmp(url, "ftp://")) {
 725#ifdef NO_CURL
 726                error("git was compiled without libcurl support.");
 727#else
 728                ret->get_refs_list = get_refs_via_curl;
 729                ret->fetch = fetch_objs_via_curl;
 730                ret->push = curl_transport_push;
 731#endif
 732                ret->disconnect = disconnect_walker;
 733
 734        } else if (is_local(url) && is_file(url)) {
 735                struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 736                ret->data = data;
 737                ret->get_refs_list = get_refs_from_bundle;
 738                ret->fetch = fetch_refs_from_bundle;
 739                ret->disconnect = close_bundle;
 740
 741        } else {
 742                struct git_transport_data *data = xcalloc(1, sizeof(*data));
 743                ret->data = data;
 744                ret->set_option = set_git_option;
 745                ret->get_refs_list = get_refs_via_connect;
 746                ret->fetch = fetch_refs_via_pack;
 747                ret->push = git_transport_push;
 748                ret->disconnect = disconnect_git;
 749
 750                data->thin = 1;
 751                data->uploadpack = "git-upload-pack";
 752                if (remote && remote->uploadpack)
 753                        data->uploadpack = remote->uploadpack;
 754                data->receivepack = "git-receive-pack";
 755                if (remote && remote->receivepack)
 756                        data->receivepack = remote->receivepack;
 757        }
 758
 759        return ret;
 760}
 761
 762int transport_set_option(struct transport *transport,
 763                         const char *name, const char *value)
 764{
 765        if (transport->set_option)
 766                return transport->set_option(transport, name, value);
 767        return 1;
 768}
 769
 770int transport_push(struct transport *transport,
 771                   int refspec_nr, const char **refspec, int flags)
 772{
 773        if (!transport->push)
 774                return 1;
 775        return transport->push(transport, refspec_nr, refspec, flags);
 776}
 777
 778struct ref *transport_get_remote_refs(struct transport *transport)
 779{
 780        if (!transport->remote_refs)
 781                transport->remote_refs = transport->get_refs_list(transport);
 782        return transport->remote_refs;
 783}
 784
 785int transport_fetch_refs(struct transport *transport, struct ref *refs)
 786{
 787        int rc;
 788        int nr_heads = 0, nr_alloc = 0;
 789        struct ref **heads = NULL;
 790        struct ref *rm;
 791
 792        for (rm = refs; rm; rm = rm->next) {
 793                if (rm->peer_ref &&
 794                    !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
 795                        continue;
 796                ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
 797                heads[nr_heads++] = rm;
 798        }
 799
 800        rc = transport->fetch(transport, nr_heads, heads);
 801        free(heads);
 802        return rc;
 803}
 804
 805void transport_unlock_pack(struct transport *transport)
 806{
 807        if (transport->pack_lockfile) {
 808                unlink(transport->pack_lockfile);
 809                free(transport->pack_lockfile);
 810                transport->pack_lockfile = NULL;
 811        }
 812}
 813
 814int transport_disconnect(struct transport *transport)
 815{
 816        int ret = 0;
 817        if (transport->disconnect)
 818                ret = transport->disconnect(transport);
 819        free(transport);
 820        return ret;
 821}