Andrew's git / gitweb.git / transport.c
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transport.con commit Remove unreachable statements (a777e9c)
   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 = 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{
 385        const char **argv;
 386        int argc;
 387        int err;
 388
 389        argv = xmalloc((refspec_nr + 12) * sizeof(char *));
 390        argv[0] = "http-push";
 391        argc = 1;
 392        if (flags & TRANSPORT_PUSH_ALL)
 393                argv[argc++] = "--all";
 394        if (flags & TRANSPORT_PUSH_FORCE)
 395                argv[argc++] = "--force";
 396        if (flags & TRANSPORT_PUSH_DRY_RUN)
 397                argv[argc++] = "--dry-run";
 398        if (flags & TRANSPORT_PUSH_VERBOSE)
 399                argv[argc++] = "--verbose";
 400        argv[argc++] = transport->url;
 401        while (refspec_nr--)
 402                argv[argc++] = *refspec++;
 403        argv[argc] = NULL;
 404        err = run_command_v_opt(argv, RUN_GIT_CMD);
 405        switch (err) {
 406        case -ERR_RUN_COMMAND_FORK:
 407                error("unable to fork for %s", argv[0]);
 408        case -ERR_RUN_COMMAND_EXEC:
 409                error("unable to exec %s", argv[0]);
 410                break;
 411        case -ERR_RUN_COMMAND_WAITPID:
 412        case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
 413        case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
 414        case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
 415                error("%s died with strange error", argv[0]);
 416        }
 417        return !!err;
 418}
 419
 420static int missing__target(int code, int result)
 421{
 422        return  /* file:// URL -- do we ever use one??? */
 423                (result == CURLE_FILE_COULDNT_READ_FILE) ||
 424                /* http:// and https:// URL */
 425                (code == 404 && result == CURLE_HTTP_RETURNED_ERROR) ||
 426                /* ftp:// URL */
 427                (code == 550 && result == CURLE_FTP_COULDNT_RETR_FILE)
 428                ;
 429}
 430
 431#define missing_target(a) missing__target((a)->http_code, (a)->curl_result)
 432
 433static struct ref *get_refs_via_curl(const struct transport *transport)
 434{
 435        struct buffer buffer;
 436        char *data, *start, *mid;
 437        char *ref_name;
 438        char *refs_url;
 439        int i = 0;
 440
 441        struct active_request_slot *slot;
 442        struct slot_results results;
 443
 444        struct ref *refs = NULL;
 445        struct ref *ref = NULL;
 446        struct ref *last_ref = NULL;
 447
 448        data = xmalloc(4096);
 449        buffer.size = 4096;
 450        buffer.posn = 0;
 451        buffer.buffer = data;
 452
 453        refs_url = xmalloc(strlen(transport->url) + 11);
 454        sprintf(refs_url, "%s/info/refs", transport->url);
 455
 456        http_init();
 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        if (start_active_slot(slot)) {
 465                run_active_slot(slot);
 466                if (results.curl_result != CURLE_OK) {
 467                        if (missing_target(&results)) {
 468                                free(buffer.buffer);
 469                                return NULL;
 470                        } else {
 471                                free(buffer.buffer);
 472                                error("%s", curl_errorstr);
 473                                return NULL;
 474                        }
 475                }
 476        } else {
 477                free(buffer.buffer);
 478                error("Unable to start request");
 479                return NULL;
 480        }
 481
 482        http_cleanup();
 483
 484        data = buffer.buffer;
 485        start = NULL;
 486        mid = data;
 487        while (i < buffer.posn) {
 488                if (!start)
 489                        start = &data[i];
 490                if (data[i] == '\t')
 491                        mid = &data[i];
 492                if (data[i] == '\n') {
 493                        data[i] = 0;
 494                        ref_name = mid + 1;
 495                        ref = xmalloc(sizeof(struct ref) +
 496                                      strlen(ref_name) + 1);
 497                        memset(ref, 0, sizeof(struct ref));
 498                        strcpy(ref->name, ref_name);
 499                        get_sha1_hex(start, ref->old_sha1);
 500                        if (!refs)
 501                                refs = ref;
 502                        if (last_ref)
 503                                last_ref->next = ref;
 504                        last_ref = ref;
 505                        start = NULL;
 506                }
 507                i++;
 508        }
 509
 510        free(buffer.buffer);
 511
 512        return refs;
 513}
 514
 515static int fetch_objs_via_curl(struct transport *transport,
 516                                 int nr_objs, struct ref **to_fetch)
 517{
 518        if (!transport->data)
 519                transport->data = get_http_walker(transport->url);
 520        return fetch_objs_via_walker(transport, nr_objs, to_fetch);
 521}
 522
 523#endif
 524
 525struct bundle_transport_data {
 526        int fd;
 527        struct bundle_header header;
 528};
 529
 530static struct ref *get_refs_from_bundle(const struct transport *transport)
 531{
 532        struct bundle_transport_data *data = transport->data;
 533        struct ref *result = NULL;
 534        int i;
 535
 536        if (data->fd > 0)
 537                close(data->fd);
 538        data->fd = read_bundle_header(transport->url, &data->header);
 539        if (data->fd < 0)
 540                die ("Could not read bundle '%s'.", transport->url);
 541        for (i = 0; i < data->header.references.nr; i++) {
 542                struct ref_list_entry *e = data->header.references.list + i;
 543                struct ref *ref = alloc_ref(strlen(e->name) + 1);
 544                hashcpy(ref->old_sha1, e->sha1);
 545                strcpy(ref->name, e->name);
 546                ref->next = result;
 547                result = ref;
 548        }
 549        return result;
 550}
 551
 552static int fetch_refs_from_bundle(struct transport *transport,
 553                               int nr_heads, struct ref **to_fetch)
 554{
 555        struct bundle_transport_data *data = transport->data;
 556        return unbundle(&data->header, data->fd);
 557}
 558
 559static int close_bundle(struct transport *transport)
 560{
 561        struct bundle_transport_data *data = transport->data;
 562        if (data->fd > 0)
 563                close(data->fd);
 564        free(data);
 565        return 0;
 566}
 567
 568struct git_transport_data {
 569        unsigned thin : 1;
 570        unsigned keep : 1;
 571        int depth;
 572        const char *uploadpack;
 573        const char *receivepack;
 574};
 575
 576static int set_git_option(struct transport *connection,
 577                          const char *name, const char *value)
 578{
 579        struct git_transport_data *data = connection->data;
 580        if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 581                data->uploadpack = value;
 582                return 0;
 583        } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 584                data->receivepack = value;
 585                return 0;
 586        } else if (!strcmp(name, TRANS_OPT_THIN)) {
 587                data->thin = !!value;
 588                return 0;
 589        } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 590                data->keep = !!value;
 591                return 0;
 592        } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 593                if (!value)
 594                        data->depth = 0;
 595                else
 596                        data->depth = atoi(value);
 597                return 0;
 598        }
 599        return 1;
 600}
 601
 602static struct ref *get_refs_via_connect(const struct transport *transport)
 603{
 604        struct git_transport_data *data = transport->data;
 605        struct ref *refs;
 606        int fd[2];
 607        char *dest = xstrdup(transport->url);
 608        struct child_process *conn = git_connect(fd, dest, data->uploadpack, 0);
 609
 610        get_remote_heads(fd[0], &refs, 0, NULL, 0);
 611        packet_flush(fd[1]);
 612
 613        finish_connect(conn);
 614
 615        free(dest);
 616
 617        return refs;
 618}
 619
 620static int fetch_refs_via_pack(struct transport *transport,
 621                               int nr_heads, struct ref **to_fetch)
 622{
 623        struct git_transport_data *data = transport->data;
 624        char **heads = xmalloc(nr_heads * sizeof(*heads));
 625        char **origh = xmalloc(nr_heads * sizeof(*origh));
 626        struct ref *refs;
 627        char *dest = xstrdup(transport->url);
 628        struct fetch_pack_args args;
 629        int i;
 630
 631        memset(&args, 0, sizeof(args));
 632        args.uploadpack = data->uploadpack;
 633        args.keep_pack = data->keep;
 634        args.lock_pack = 1;
 635        args.use_thin_pack = data->thin;
 636        args.verbose = transport->verbose > 0;
 637        args.depth = data->depth;
 638
 639        for (i = 0; i < nr_heads; i++)
 640                origh[i] = heads[i] = xstrdup(to_fetch[i]->name);
 641        refs = fetch_pack(&args, dest, nr_heads, heads, &transport->pack_lockfile);
 642
 643        for (i = 0; i < nr_heads; i++)
 644                free(origh[i]);
 645        free(origh);
 646        free(heads);
 647        free_refs(refs);
 648        free(dest);
 649        return 0;
 650}
 651
 652static int git_transport_push(struct transport *transport, int refspec_nr, const char **refspec, int flags)
 653{
 654        struct git_transport_data *data = transport->data;
 655        const char **argv;
 656        char *rem;
 657        int argc;
 658        int err;
 659
 660        argv = xmalloc((refspec_nr + 12) * sizeof(char *));
 661        argv[0] = "send-pack";
 662        argc = 1;
 663        if (flags & TRANSPORT_PUSH_ALL)
 664                argv[argc++] = "--all";
 665        if (flags & TRANSPORT_PUSH_FORCE)
 666                argv[argc++] = "--force";
 667        if (flags & TRANSPORT_PUSH_DRY_RUN)
 668                argv[argc++] = "--dry-run";
 669        if (flags & TRANSPORT_PUSH_VERBOSE)
 670                argv[argc++] = "--verbose";
 671        if (data->receivepack) {
 672                char *rp = xmalloc(strlen(data->receivepack) + 16);
 673                sprintf(rp, "--receive-pack=%s", data->receivepack);
 674                argv[argc++] = rp;
 675        }
 676        if (data->thin)
 677                argv[argc++] = "--thin";
 678        rem = xmalloc(strlen(transport->remote->name) + 10);
 679        sprintf(rem, "--remote=%s", transport->remote->name);
 680        argv[argc++] = rem;
 681        argv[argc++] = transport->url;
 682        while (refspec_nr--)
 683                argv[argc++] = *refspec++;
 684        argv[argc] = NULL;
 685        err = run_command_v_opt(argv, RUN_GIT_CMD);
 686        switch (err) {
 687        case -ERR_RUN_COMMAND_FORK:
 688                error("unable to fork for %s", argv[0]);
 689        case -ERR_RUN_COMMAND_EXEC:
 690                error("unable to exec %s", argv[0]);
 691                break;
 692        case -ERR_RUN_COMMAND_WAITPID:
 693        case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
 694        case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
 695        case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
 696                error("%s died with strange error", argv[0]);
 697        }
 698        return !!err;
 699}
 700
 701static int disconnect_git(struct transport *transport)
 702{
 703        free(transport->data);
 704        return 0;
 705}
 706
 707static int is_local(const char *url)
 708{
 709        const char *colon = strchr(url, ':');
 710        const char *slash = strchr(url, '/');
 711        return !colon || (slash && slash < colon);
 712}
 713
 714static int is_file(const char *url)
 715{
 716        struct stat buf;
 717        if (stat(url, &buf))
 718                return 0;
 719        return S_ISREG(buf.st_mode);
 720}
 721
 722struct transport *transport_get(struct remote *remote, const char *url)
 723{
 724        struct transport *ret = xcalloc(1, sizeof(*ret));
 725
 726        ret->remote = remote;
 727        ret->url = url;
 728
 729        if (!prefixcmp(url, "rsync://")) {
 730                ret->get_refs_list = get_refs_via_rsync;
 731                ret->fetch = fetch_objs_via_rsync;
 732                ret->push = rsync_transport_push;
 733
 734        } else if (!prefixcmp(url, "http://")
 735                || !prefixcmp(url, "https://")
 736                || !prefixcmp(url, "ftp://")) {
 737#ifdef NO_CURL
 738                error("git was compiled without libcurl support.");
 739#else
 740                ret->get_refs_list = get_refs_via_curl;
 741                ret->fetch = fetch_objs_via_curl;
 742                ret->push = curl_transport_push;
 743#endif
 744                ret->disconnect = disconnect_walker;
 745
 746        } else if (is_local(url) && is_file(url)) {
 747                struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 748                ret->data = data;
 749                ret->get_refs_list = get_refs_from_bundle;
 750                ret->fetch = fetch_refs_from_bundle;
 751                ret->disconnect = close_bundle;
 752
 753        } else {
 754                struct git_transport_data *data = xcalloc(1, sizeof(*data));
 755                ret->data = data;
 756                ret->set_option = set_git_option;
 757                ret->get_refs_list = get_refs_via_connect;
 758                ret->fetch = fetch_refs_via_pack;
 759                ret->push = git_transport_push;
 760                ret->disconnect = disconnect_git;
 761
 762                data->thin = 1;
 763                data->uploadpack = "git-upload-pack";
 764                if (remote && remote->uploadpack)
 765                        data->uploadpack = remote->uploadpack;
 766                data->receivepack = "git-receive-pack";
 767                if (remote && remote->receivepack)
 768                        data->receivepack = remote->receivepack;
 769        }
 770
 771        return ret;
 772}
 773
 774int transport_set_option(struct transport *transport,
 775                         const char *name, const char *value)
 776{
 777        if (transport->set_option)
 778                return transport->set_option(transport, name, value);
 779        return 1;
 780}
 781
 782int transport_push(struct transport *transport,
 783                   int refspec_nr, const char **refspec, int flags)
 784{
 785        if (!transport->push)
 786                return 1;
 787        return transport->push(transport, refspec_nr, refspec, flags);
 788}
 789
 790struct ref *transport_get_remote_refs(struct transport *transport)
 791{
 792        if (!transport->remote_refs)
 793                transport->remote_refs = transport->get_refs_list(transport);
 794        return transport->remote_refs;
 795}
 796
 797int transport_fetch_refs(struct transport *transport, struct ref *refs)
 798{
 799        int rc;
 800        int nr_heads = 0, nr_alloc = 0;
 801        struct ref **heads = NULL;
 802        struct ref *rm;
 803
 804        for (rm = refs; rm; rm = rm->next) {
 805                if (rm->peer_ref &&
 806                    !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
 807                        continue;
 808                ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
 809                heads[nr_heads++] = rm;
 810        }
 811
 812        rc = transport->fetch(transport, nr_heads, heads);
 813        free(heads);
 814        return rc;
 815}
 816
 817void transport_unlock_pack(struct transport *transport)
 818{
 819        if (transport->pack_lockfile) {
 820                unlink(transport->pack_lockfile);
 821                free(transport->pack_lockfile);
 822                transport->pack_lockfile = NULL;
 823        }
 824}
 825
 826int transport_disconnect(struct transport *transport)
 827{
 828        int ret = 0;
 829        if (transport->disconnect)
 830                ret = transport->disconnect(transport);
 831        free(transport);
 832        return ret;
 833}