Andrew's git / gitweb.git / transport.c
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transport.con commit Merge branch 'jk/send-pack' into HEAD (7ae4dd0)
   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[10];
 285
 286        /* first push the objects */
 287
 288        strbuf_addstr(&buf, transport->url);
 289        strbuf_addch(&buf, '/');
 290
 291        memset(&rsync, 0, sizeof(rsync));
 292        rsync.argv = args;
 293        rsync.stdout_to_stderr = 1;
 294        i = 0;
 295        args[i++] = "rsync";
 296        args[i++] = "-a";
 297        if (flags & TRANSPORT_PUSH_DRY_RUN)
 298                args[i++] = "--dry-run";
 299        if (transport->verbose > 0)
 300                args[i++] = "-v";
 301        args[i++] = "--ignore-existing";
 302        args[i++] = "--exclude";
 303        args[i++] = "info";
 304        args[i++] = get_object_directory();
 305        args[i++] = buf.buf;
 306        args[i++] = NULL;
 307
 308        if (run_command(&rsync))
 309                return error("Could not push objects to %s", transport->url);
 310
 311        /* copy the refs to the temporary directory; they could be packed. */
 312
 313        strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 314        if (!mkdtemp(temp_dir.buf))
 315                die ("Could not make temporary directory");
 316        strbuf_addch(&temp_dir, '/');
 317
 318        if (flags & TRANSPORT_PUSH_ALL) {
 319                if (for_each_ref(write_one_ref, &temp_dir))
 320                        return -1;
 321        } else if (write_refs_to_temp_dir(&temp_dir, refspec_nr, refspec))
 322                return -1;
 323
 324        i = 2;
 325        if (flags & TRANSPORT_PUSH_DRY_RUN)
 326                args[i++] = "--dry-run";
 327        if (!(flags & TRANSPORT_PUSH_FORCE))
 328                args[i++] = "--ignore-existing";
 329        args[i++] = temp_dir.buf;
 330        args[i++] = transport->url;
 331        args[i++] = NULL;
 332        if (run_command(&rsync))
 333                result = error("Could not push to %s", transport->url);
 334
 335        if (remove_dir_recursively(&temp_dir, 0))
 336                warning ("Could not remove temporary directory %s.",
 337                                temp_dir.buf);
 338
 339        strbuf_release(&buf);
 340        strbuf_release(&temp_dir);
 341
 342        return result;
 343}
 344
 345/* Generic functions for using commit walkers */
 346
 347static int fetch_objs_via_walker(struct transport *transport,
 348                                 int nr_objs, struct ref **to_fetch)
 349{
 350        char *dest = xstrdup(transport->url);
 351        struct walker *walker = transport->data;
 352        char **objs = xmalloc(nr_objs * sizeof(*objs));
 353        int i;
 354
 355        walker->get_all = 1;
 356        walker->get_tree = 1;
 357        walker->get_history = 1;
 358        walker->get_verbosely = transport->verbose >= 0;
 359        walker->get_recover = 0;
 360
 361        for (i = 0; i < nr_objs; i++)
 362                objs[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 363
 364        if (walker_fetch(walker, nr_objs, objs, NULL, NULL))
 365                die("Fetch failed.");
 366
 367        for (i = 0; i < nr_objs; i++)
 368                free(objs[i]);
 369        free(objs);
 370        free(dest);
 371        return 0;
 372}
 373
 374static int disconnect_walker(struct transport *transport)
 375{
 376        struct walker *walker = transport->data;
 377        if (walker)
 378                walker_free(walker);
 379        return 0;
 380}
 381
 382#ifndef NO_CURL
 383static int curl_transport_push(struct transport *transport, int refspec_nr, const char **refspec, int flags) {
 384        const char **argv;
 385        int argc;
 386        int err;
 387
 388        argv = xmalloc((refspec_nr + 11) * sizeof(char *));
 389        argv[0] = "http-push";
 390        argc = 1;
 391        if (flags & TRANSPORT_PUSH_ALL)
 392                argv[argc++] = "--all";
 393        if (flags & TRANSPORT_PUSH_FORCE)
 394                argv[argc++] = "--force";
 395        if (flags & TRANSPORT_PUSH_DRY_RUN)
 396                argv[argc++] = "--dry-run";
 397        argv[argc++] = transport->url;
 398        while (refspec_nr--)
 399                argv[argc++] = *refspec++;
 400        argv[argc] = NULL;
 401        err = run_command_v_opt(argv, RUN_GIT_CMD);
 402        switch (err) {
 403        case -ERR_RUN_COMMAND_FORK:
 404                error("unable to fork for %s", argv[0]);
 405        case -ERR_RUN_COMMAND_EXEC:
 406                error("unable to exec %s", argv[0]);
 407                break;
 408        case -ERR_RUN_COMMAND_WAITPID:
 409        case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
 410        case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
 411        case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
 412                error("%s died with strange error", argv[0]);
 413        }
 414        return !!err;
 415}
 416
 417static int missing__target(int code, int result)
 418{
 419        return  /* file:// URL -- do we ever use one??? */
 420                (result == CURLE_FILE_COULDNT_READ_FILE) ||
 421                /* http:// and https:// URL */
 422                (code == 404 && result == CURLE_HTTP_RETURNED_ERROR) ||
 423                /* ftp:// URL */
 424                (code == 550 && result == CURLE_FTP_COULDNT_RETR_FILE)
 425                ;
 426}
 427
 428#define missing_target(a) missing__target((a)->http_code, (a)->curl_result)
 429
 430static struct ref *get_refs_via_curl(const struct transport *transport)
 431{
 432        struct buffer buffer;
 433        char *data, *start, *mid;
 434        char *ref_name;
 435        char *refs_url;
 436        int i = 0;
 437
 438        struct active_request_slot *slot;
 439        struct slot_results results;
 440
 441        struct ref *refs = NULL;
 442        struct ref *ref = NULL;
 443        struct ref *last_ref = NULL;
 444
 445        data = xmalloc(4096);
 446        buffer.size = 4096;
 447        buffer.posn = 0;
 448        buffer.buffer = data;
 449
 450        refs_url = xmalloc(strlen(transport->url) + 11);
 451        sprintf(refs_url, "%s/info/refs", transport->url);
 452
 453        http_init();
 454
 455        slot = get_active_slot();
 456        slot->results = &results;
 457        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
 458        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 459        curl_easy_setopt(slot->curl, CURLOPT_URL, refs_url);
 460        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
 461        if (start_active_slot(slot)) {
 462                run_active_slot(slot);
 463                if (results.curl_result != CURLE_OK) {
 464                        if (missing_target(&results)) {
 465                                free(buffer.buffer);
 466                                return NULL;
 467                        } else {
 468                                free(buffer.buffer);
 469                                error("%s", curl_errorstr);
 470                                return NULL;
 471                        }
 472                }
 473        } else {
 474                free(buffer.buffer);
 475                error("Unable to start request");
 476                return NULL;
 477        }
 478
 479        http_cleanup();
 480
 481        data = buffer.buffer;
 482        start = NULL;
 483        mid = data;
 484        while (i < buffer.posn) {
 485                if (!start)
 486                        start = &data[i];
 487                if (data[i] == '\t')
 488                        mid = &data[i];
 489                if (data[i] == '\n') {
 490                        data[i] = 0;
 491                        ref_name = mid + 1;
 492                        ref = xmalloc(sizeof(struct ref) +
 493                                      strlen(ref_name) + 1);
 494                        memset(ref, 0, sizeof(struct ref));
 495                        strcpy(ref->name, ref_name);
 496                        get_sha1_hex(start, ref->old_sha1);
 497                        if (!refs)
 498                                refs = ref;
 499                        if (last_ref)
 500                                last_ref->next = ref;
 501                        last_ref = ref;
 502                        start = NULL;
 503                }
 504                i++;
 505        }
 506
 507        free(buffer.buffer);
 508
 509        return refs;
 510}
 511
 512static int fetch_objs_via_curl(struct transport *transport,
 513                                 int nr_objs, struct ref **to_fetch)
 514{
 515        if (!transport->data)
 516                transport->data = get_http_walker(transport->url);
 517        return fetch_objs_via_walker(transport, nr_objs, to_fetch);
 518}
 519
 520#endif
 521
 522struct bundle_transport_data {
 523        int fd;
 524        struct bundle_header header;
 525};
 526
 527static struct ref *get_refs_from_bundle(const struct transport *transport)
 528{
 529        struct bundle_transport_data *data = transport->data;
 530        struct ref *result = NULL;
 531        int i;
 532
 533        if (data->fd > 0)
 534                close(data->fd);
 535        data->fd = read_bundle_header(transport->url, &data->header);
 536        if (data->fd < 0)
 537                die ("Could not read bundle '%s'.", transport->url);
 538        for (i = 0; i < data->header.references.nr; i++) {
 539                struct ref_list_entry *e = data->header.references.list + i;
 540                struct ref *ref = alloc_ref(strlen(e->name) + 1);
 541                hashcpy(ref->old_sha1, e->sha1);
 542                strcpy(ref->name, e->name);
 543                ref->next = result;
 544                result = ref;
 545        }
 546        return result;
 547}
 548
 549static int fetch_refs_from_bundle(struct transport *transport,
 550                               int nr_heads, struct ref **to_fetch)
 551{
 552        struct bundle_transport_data *data = transport->data;
 553        return unbundle(&data->header, data->fd);
 554}
 555
 556static int close_bundle(struct transport *transport)
 557{
 558        struct bundle_transport_data *data = transport->data;
 559        if (data->fd > 0)
 560                close(data->fd);
 561        free(data);
 562        return 0;
 563}
 564
 565struct git_transport_data {
 566        unsigned thin : 1;
 567        unsigned keep : 1;
 568        int depth;
 569        const char *uploadpack;
 570        const char *receivepack;
 571};
 572
 573static int set_git_option(struct transport *connection,
 574                          const char *name, const char *value)
 575{
 576        struct git_transport_data *data = connection->data;
 577        if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 578                data->uploadpack = value;
 579                return 0;
 580        } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 581                data->receivepack = value;
 582                return 0;
 583        } else if (!strcmp(name, TRANS_OPT_THIN)) {
 584                data->thin = !!value;
 585                return 0;
 586        } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 587                data->keep = !!value;
 588                return 0;
 589        } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 590                if (!value)
 591                        data->depth = 0;
 592                else
 593                        data->depth = atoi(value);
 594                return 0;
 595        }
 596        return 1;
 597}
 598
 599static struct ref *get_refs_via_connect(const struct transport *transport)
 600{
 601        struct git_transport_data *data = transport->data;
 602        struct ref *refs;
 603        int fd[2];
 604        pid_t pid;
 605        char *dest = xstrdup(transport->url);
 606
 607        pid = git_connect(fd, dest, data->uploadpack, 0);
 608
 609        if (pid < 0)
 610                die("Failed to connect to \"%s\"", transport->url);
 611
 612        get_remote_heads(fd[0], &refs, 0, NULL, 0);
 613        packet_flush(fd[1]);
 614
 615        finish_connect(pid);
 616
 617        free(dest);
 618
 619        return refs;
 620}
 621
 622static int fetch_refs_via_pack(struct transport *transport,
 623                               int nr_heads, struct ref **to_fetch)
 624{
 625        struct git_transport_data *data = transport->data;
 626        char **heads = xmalloc(nr_heads * sizeof(*heads));
 627        char **origh = xmalloc(nr_heads * sizeof(*origh));
 628        struct ref *refs;
 629        char *dest = xstrdup(transport->url);
 630        struct fetch_pack_args args;
 631        int i;
 632
 633        memset(&args, 0, sizeof(args));
 634        args.uploadpack = data->uploadpack;
 635        args.keep_pack = data->keep;
 636        args.lock_pack = 1;
 637        args.use_thin_pack = data->thin;
 638        args.verbose = transport->verbose > 0;
 639        args.depth = data->depth;
 640
 641        for (i = 0; i < nr_heads; i++)
 642                origh[i] = heads[i] = xstrdup(to_fetch[i]->name);
 643        refs = fetch_pack(&args, dest, nr_heads, heads, &transport->pack_lockfile);
 644
 645        for (i = 0; i < nr_heads; i++)
 646                free(origh[i]);
 647        free(origh);
 648        free(heads);
 649        free_refs(refs);
 650        free(dest);
 651        return 0;
 652}
 653
 654static int git_transport_push(struct transport *transport, int refspec_nr, const char **refspec, int flags) {
 655        struct git_transport_data *data = transport->data;
 656        const char **argv;
 657        char *rem;
 658        int argc;
 659        int err;
 660
 661        argv = xmalloc((refspec_nr + 11) * sizeof(char *));
 662        argv[0] = "send-pack";
 663        argc = 1;
 664        if (flags & TRANSPORT_PUSH_ALL)
 665                argv[argc++] = "--all";
 666        if (flags & TRANSPORT_PUSH_FORCE)
 667                argv[argc++] = "--force";
 668        if (flags & TRANSPORT_PUSH_DRY_RUN)
 669                argv[argc++] = "--dry-run";
 670        if (data->receivepack) {
 671                char *rp = xmalloc(strlen(data->receivepack) + 16);
 672                sprintf(rp, "--receive-pack=%s", data->receivepack);
 673                argv[argc++] = rp;
 674        }
 675        if (data->thin)
 676                argv[argc++] = "--thin";
 677        rem = xmalloc(strlen(transport->remote->name) + 10);
 678        sprintf(rem, "--remote=%s", transport->remote->name);
 679        argv[argc++] = rem;
 680        argv[argc++] = transport->url;
 681        while (refspec_nr--)
 682                argv[argc++] = *refspec++;
 683        argv[argc] = NULL;
 684        err = run_command_v_opt(argv, RUN_GIT_CMD);
 685        switch (err) {
 686        case -ERR_RUN_COMMAND_FORK:
 687                error("unable to fork for %s", argv[0]);
 688        case -ERR_RUN_COMMAND_EXEC:
 689                error("unable to exec %s", argv[0]);
 690                break;
 691        case -ERR_RUN_COMMAND_WAITPID:
 692        case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
 693        case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
 694        case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
 695                error("%s died with strange error", argv[0]);
 696        }
 697        return !!err;
 698}
 699
 700static int disconnect_git(struct transport *transport)
 701{
 702        free(transport->data);
 703        return 0;
 704}
 705
 706static int is_local(const char *url)
 707{
 708        const char *colon = strchr(url, ':');
 709        const char *slash = strchr(url, '/');
 710        return !colon || (slash && slash < colon);
 711}
 712
 713static int is_file(const char *url)
 714{
 715        struct stat buf;
 716        if (stat(url, &buf))
 717                return 0;
 718        return S_ISREG(buf.st_mode);
 719}
 720
 721struct transport *transport_get(struct remote *remote, const char *url)
 722{
 723        struct transport *ret = xcalloc(1, sizeof(*ret));
 724
 725        ret->remote = remote;
 726        ret->url = url;
 727
 728        if (!prefixcmp(url, "rsync://")) {
 729                ret->get_refs_list = get_refs_via_rsync;
 730                ret->fetch = fetch_objs_via_rsync;
 731                ret->push = rsync_transport_push;
 732
 733        } else if (!prefixcmp(url, "http://")
 734                || !prefixcmp(url, "https://")
 735                || !prefixcmp(url, "ftp://")) {
 736#ifdef NO_CURL
 737                error("git was compiled without libcurl support.");
 738#else
 739                ret->get_refs_list = get_refs_via_curl;
 740                ret->fetch = fetch_objs_via_curl;
 741                ret->push = curl_transport_push;
 742#endif
 743                ret->disconnect = disconnect_walker;
 744
 745        } else if (is_local(url) && is_file(url)) {
 746                struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 747                ret->data = data;
 748                ret->get_refs_list = get_refs_from_bundle;
 749                ret->fetch = fetch_refs_from_bundle;
 750                ret->disconnect = close_bundle;
 751
 752        } else {
 753                struct git_transport_data *data = xcalloc(1, sizeof(*data));
 754                ret->data = data;
 755                ret->set_option = set_git_option;
 756                ret->get_refs_list = get_refs_via_connect;
 757                ret->fetch = fetch_refs_via_pack;
 758                ret->push = git_transport_push;
 759                ret->disconnect = disconnect_git;
 760
 761                data->thin = 1;
 762                data->uploadpack = "git-upload-pack";
 763                if (remote && remote->uploadpack)
 764                        data->uploadpack = remote->uploadpack;
 765                data->receivepack = "git-receive-pack";
 766                if (remote && remote->receivepack)
 767                        data->receivepack = remote->receivepack;
 768        }
 769
 770        return ret;
 771}
 772
 773int transport_set_option(struct transport *transport,
 774                         const char *name, const char *value)
 775{
 776        if (transport->set_option)
 777                return transport->set_option(transport, name, value);
 778        return 1;
 779}
 780
 781int transport_push(struct transport *transport,
 782                   int refspec_nr, const char **refspec, int flags)
 783{
 784        if (!transport->push)
 785                return 1;
 786        return transport->push(transport, refspec_nr, refspec, flags);
 787}
 788
 789struct ref *transport_get_remote_refs(struct transport *transport)
 790{
 791        if (!transport->remote_refs)
 792                transport->remote_refs = transport->get_refs_list(transport);
 793        return transport->remote_refs;
 794}
 795
 796int transport_fetch_refs(struct transport *transport, struct ref *refs)
 797{
 798        int rc;
 799        int nr_heads = 0, nr_alloc = 0;
 800        struct ref **heads = NULL;
 801        struct ref *rm;
 802
 803        for (rm = refs; rm; rm = rm->next) {
 804                if (rm->peer_ref &&
 805                    !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
 806                        continue;
 807                ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
 808                heads[nr_heads++] = rm;
 809        }
 810
 811        rc = transport->fetch(transport, nr_heads, heads);
 812        free(heads);
 813        return rc;
 814}
 815
 816void transport_unlock_pack(struct transport *transport)
 817{
 818        if (transport->pack_lockfile) {
 819                unlink(transport->pack_lockfile);
 820                free(transport->pack_lockfile);
 821                transport->pack_lockfile = NULL;
 822        }
 823}
 824
 825int transport_disconnect(struct transport *transport)
 826{
 827        int ret = 0;
 828        if (transport->disconnect)
 829                ret = transport->disconnect(transport);
 830        free(transport);
 831        return ret;
 832}