Andrew's git / gitweb.git / transport.c
?
transport.con commit builtin-send-pack.c: avoid empty structure initialization (6828f72)
   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 struct ref *get_refs_via_rsync(struct transport *transport, int for_push)
 142{
 143        struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 144        struct ref dummy, *tail = &dummy;
 145        struct child_process rsync;
 146        const char *args[5];
 147        int temp_dir_len;
 148
 149        if (for_push)
 150                return NULL;
 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, const 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        if (flags & TRANSPORT_PUSH_MIRROR)
 287                return error("rsync transport does not support mirror mode");
 288
 289        /* first push the objects */
 290
 291        strbuf_addstr(&buf, transport->url);
 292        strbuf_addch(&buf, '/');
 293
 294        memset(&rsync, 0, sizeof(rsync));
 295        rsync.argv = args;
 296        rsync.stdout_to_stderr = 1;
 297        i = 0;
 298        args[i++] = "rsync";
 299        args[i++] = "-a";
 300        if (flags & TRANSPORT_PUSH_DRY_RUN)
 301                args[i++] = "--dry-run";
 302        if (transport->verbose > 0)
 303                args[i++] = "-v";
 304        args[i++] = "--ignore-existing";
 305        args[i++] = "--exclude";
 306        args[i++] = "info";
 307        args[i++] = get_object_directory();
 308        args[i++] = buf.buf;
 309        args[i++] = NULL;
 310
 311        if (run_command(&rsync))
 312                return error("Could not push objects to %s", transport->url);
 313
 314        /* copy the refs to the temporary directory; they could be packed. */
 315
 316        strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 317        if (!mkdtemp(temp_dir.buf))
 318                die ("Could not make temporary directory");
 319        strbuf_addch(&temp_dir, '/');
 320
 321        if (flags & TRANSPORT_PUSH_ALL) {
 322                if (for_each_ref(write_one_ref, &temp_dir))
 323                        return -1;
 324        } else if (write_refs_to_temp_dir(&temp_dir, refspec_nr, refspec))
 325                return -1;
 326
 327        i = 2;
 328        if (flags & TRANSPORT_PUSH_DRY_RUN)
 329                args[i++] = "--dry-run";
 330        if (!(flags & TRANSPORT_PUSH_FORCE))
 331                args[i++] = "--ignore-existing";
 332        args[i++] = temp_dir.buf;
 333        args[i++] = transport->url;
 334        args[i++] = NULL;
 335        if (run_command(&rsync))
 336                result = error("Could not push to %s", transport->url);
 337
 338        if (remove_dir_recursively(&temp_dir, 0))
 339                warning ("Could not remove temporary directory %s.",
 340                                temp_dir.buf);
 341
 342        strbuf_release(&buf);
 343        strbuf_release(&temp_dir);
 344
 345        return result;
 346}
 347
 348/* Generic functions for using commit walkers */
 349
 350#ifndef NO_CURL /* http fetch is the only user */
 351static int fetch_objs_via_walker(struct transport *transport,
 352                                 int nr_objs, const struct ref **to_fetch)
 353{
 354        char *dest = xstrdup(transport->url);
 355        struct walker *walker = transport->data;
 356        char **objs = xmalloc(nr_objs * sizeof(*objs));
 357        int i;
 358
 359        walker->get_all = 1;
 360        walker->get_tree = 1;
 361        walker->get_history = 1;
 362        walker->get_verbosely = transport->verbose >= 0;
 363        walker->get_recover = 0;
 364
 365        for (i = 0; i < nr_objs; i++)
 366                objs[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 367
 368        if (walker_fetch(walker, nr_objs, objs, NULL, NULL))
 369                die("Fetch failed.");
 370
 371        for (i = 0; i < nr_objs; i++)
 372                free(objs[i]);
 373        free(objs);
 374        free(dest);
 375        return 0;
 376}
 377#endif /* NO_CURL */
 378
 379static int disconnect_walker(struct transport *transport)
 380{
 381        struct walker *walker = transport->data;
 382        if (walker)
 383                walker_free(walker);
 384        return 0;
 385}
 386
 387#ifndef NO_CURL
 388static int curl_transport_push(struct transport *transport, int refspec_nr, const char **refspec, int flags)
 389{
 390        const char **argv;
 391        int argc;
 392        int err;
 393
 394        if (flags & TRANSPORT_PUSH_MIRROR)
 395                return error("http transport does not support mirror mode");
 396
 397        argv = xmalloc((refspec_nr + 12) * sizeof(char *));
 398        argv[0] = "http-push";
 399        argc = 1;
 400        if (flags & TRANSPORT_PUSH_ALL)
 401                argv[argc++] = "--all";
 402        if (flags & TRANSPORT_PUSH_FORCE)
 403                argv[argc++] = "--force";
 404        if (flags & TRANSPORT_PUSH_DRY_RUN)
 405                argv[argc++] = "--dry-run";
 406        if (flags & TRANSPORT_PUSH_VERBOSE)
 407                argv[argc++] = "--verbose";
 408        argv[argc++] = transport->url;
 409        while (refspec_nr--)
 410                argv[argc++] = *refspec++;
 411        argv[argc] = NULL;
 412        err = run_command_v_opt(argv, RUN_GIT_CMD);
 413        switch (err) {
 414        case -ERR_RUN_COMMAND_FORK:
 415                error("unable to fork for %s", argv[0]);
 416        case -ERR_RUN_COMMAND_EXEC:
 417                error("unable to exec %s", argv[0]);
 418                break;
 419        case -ERR_RUN_COMMAND_WAITPID:
 420        case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
 421        case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
 422        case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
 423                error("%s died with strange error", argv[0]);
 424        }
 425        return !!err;
 426}
 427
 428static struct ref *get_refs_via_curl(struct transport *transport, int for_push)
 429{
 430        struct strbuf buffer = STRBUF_INIT;
 431        char *data, *start, *mid;
 432        char *ref_name;
 433        char *refs_url;
 434        int i = 0;
 435
 436        struct active_request_slot *slot;
 437        struct slot_results results;
 438
 439        struct ref *refs = NULL;
 440        struct ref *ref = NULL;
 441        struct ref *last_ref = NULL;
 442
 443        struct walker *walker;
 444
 445        if (for_push)
 446                return NULL;
 447
 448        if (!transport->data)
 449                transport->data = get_http_walker(transport->url,
 450                                                transport->remote);
 451
 452        walker = transport->data;
 453
 454        refs_url = xmalloc(strlen(transport->url) + 11);
 455        sprintf(refs_url, "%s/info/refs", transport->url);
 456
 457        slot = get_active_slot();
 458        slot->results = &results;
 459        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
 460        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 461        curl_easy_setopt(slot->curl, CURLOPT_URL, refs_url);
 462        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
 463
 464        if (start_active_slot(slot)) {
 465                run_active_slot(slot);
 466                if (results.curl_result != CURLE_OK) {
 467                        strbuf_release(&buffer);
 468                        if (missing_target(&results))
 469                                die("%s not found: did you run git update-server-info on the server?", refs_url);
 470                        else
 471                                die("%s download error - %s", refs_url, curl_errorstr);
 472                }
 473        } else {
 474                strbuf_release(&buffer);
 475                die("Unable to start HTTP request");
 476        }
 477
 478        data = buffer.buf;
 479        start = NULL;
 480        mid = data;
 481        while (i < buffer.len) {
 482                if (!start)
 483                        start = &data[i];
 484                if (data[i] == '\t')
 485                        mid = &data[i];
 486                if (data[i] == '\n') {
 487                        data[i] = 0;
 488                        ref_name = mid + 1;
 489                        ref = xmalloc(sizeof(struct ref) +
 490                                      strlen(ref_name) + 1);
 491                        memset(ref, 0, sizeof(struct ref));
 492                        strcpy(ref->name, ref_name);
 493                        get_sha1_hex(start, ref->old_sha1);
 494                        if (!refs)
 495                                refs = ref;
 496                        if (last_ref)
 497                                last_ref->next = ref;
 498                        last_ref = ref;
 499                        start = NULL;
 500                }
 501                i++;
 502        }
 503
 504        strbuf_release(&buffer);
 505
 506        ref = alloc_ref("HEAD");
 507        if (!walker->fetch_ref(walker, ref) &&
 508            !resolve_remote_symref(ref, refs)) {
 509                ref->next = refs;
 510                refs = ref;
 511        } else {
 512                free(ref);
 513        }
 514
 515        return refs;
 516}
 517
 518static int fetch_objs_via_curl(struct transport *transport,
 519                                 int nr_objs, const struct ref **to_fetch)
 520{
 521        if (!transport->data)
 522                transport->data = get_http_walker(transport->url,
 523                                                transport->remote);
 524        return fetch_objs_via_walker(transport, nr_objs, to_fetch);
 525}
 526
 527#endif
 528
 529struct bundle_transport_data {
 530        int fd;
 531        struct bundle_header header;
 532};
 533
 534static struct ref *get_refs_from_bundle(struct transport *transport, int for_push)
 535{
 536        struct bundle_transport_data *data = transport->data;
 537        struct ref *result = NULL;
 538        int i;
 539
 540        if (for_push)
 541                return NULL;
 542
 543        if (data->fd > 0)
 544                close(data->fd);
 545        data->fd = read_bundle_header(transport->url, &data->header);
 546        if (data->fd < 0)
 547                die ("Could not read bundle '%s'.", transport->url);
 548        for (i = 0; i < data->header.references.nr; i++) {
 549                struct ref_list_entry *e = data->header.references.list + i;
 550                struct ref *ref = alloc_ref(e->name);
 551                hashcpy(ref->old_sha1, e->sha1);
 552                ref->next = result;
 553                result = ref;
 554        }
 555        return result;
 556}
 557
 558static int fetch_refs_from_bundle(struct transport *transport,
 559                               int nr_heads, const struct ref **to_fetch)
 560{
 561        struct bundle_transport_data *data = transport->data;
 562        return unbundle(&data->header, data->fd);
 563}
 564
 565static int close_bundle(struct transport *transport)
 566{
 567        struct bundle_transport_data *data = transport->data;
 568        if (data->fd > 0)
 569                close(data->fd);
 570        free(data);
 571        return 0;
 572}
 573
 574struct git_transport_data {
 575        unsigned thin : 1;
 576        unsigned keep : 1;
 577        unsigned followtags : 1;
 578        int depth;
 579        struct child_process *conn;
 580        int fd[2];
 581        const char *uploadpack;
 582        const char *receivepack;
 583        struct extra_have_objects extra_have;
 584};
 585
 586static int set_git_option(struct transport *connection,
 587                          const char *name, const char *value)
 588{
 589        struct git_transport_data *data = connection->data;
 590        if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 591                data->uploadpack = value;
 592                return 0;
 593        } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 594                data->receivepack = value;
 595                return 0;
 596        } else if (!strcmp(name, TRANS_OPT_THIN)) {
 597                data->thin = !!value;
 598                return 0;
 599        } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
 600                data->followtags = !!value;
 601                return 0;
 602        } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 603                data->keep = !!value;
 604                return 0;
 605        } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 606                if (!value)
 607                        data->depth = 0;
 608                else
 609                        data->depth = atoi(value);
 610                return 0;
 611        }
 612        return 1;
 613}
 614
 615static int connect_setup(struct transport *transport, int for_push, int verbose)
 616{
 617        struct git_transport_data *data = transport->data;
 618        data->conn = git_connect(data->fd, transport->url,
 619                                 for_push ? data->receivepack : data->uploadpack,
 620                                 verbose ? CONNECT_VERBOSE : 0);
 621        return 0;
 622}
 623
 624static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
 625{
 626        struct git_transport_data *data = transport->data;
 627        struct ref *refs;
 628
 629        connect_setup(transport, for_push, 0);
 630        get_remote_heads(data->fd[0], &refs, 0, NULL,
 631                         for_push ? REF_NORMAL : 0, &data->extra_have);
 632
 633        return refs;
 634}
 635
 636static int fetch_refs_via_pack(struct transport *transport,
 637                               int nr_heads, const struct ref **to_fetch)
 638{
 639        struct git_transport_data *data = transport->data;
 640        char **heads = xmalloc(nr_heads * sizeof(*heads));
 641        char **origh = xmalloc(nr_heads * sizeof(*origh));
 642        const struct ref *refs;
 643        char *dest = xstrdup(transport->url);
 644        struct fetch_pack_args args;
 645        int i;
 646        struct ref *refs_tmp = NULL;
 647
 648        memset(&args, 0, sizeof(args));
 649        args.uploadpack = data->uploadpack;
 650        args.keep_pack = data->keep;
 651        args.lock_pack = 1;
 652        args.use_thin_pack = data->thin;
 653        args.include_tag = data->followtags;
 654        args.verbose = (transport->verbose > 0);
 655        args.quiet = (transport->verbose < 0);
 656        args.no_progress = args.quiet || (!transport->progress && !isatty(1));
 657        args.depth = data->depth;
 658
 659        for (i = 0; i < nr_heads; i++)
 660                origh[i] = heads[i] = xstrdup(to_fetch[i]->name);
 661
 662        if (!data->conn) {
 663                connect_setup(transport, 0, 0);
 664                get_remote_heads(data->fd[0], &refs_tmp, 0, NULL, 0, NULL);
 665        }
 666
 667        refs = fetch_pack(&args, data->fd, data->conn,
 668                          refs_tmp ? refs_tmp : transport->remote_refs,
 669                          dest, nr_heads, heads, &transport->pack_lockfile);
 670        close(data->fd[0]);
 671        close(data->fd[1]);
 672        if (finish_connect(data->conn))
 673                refs = NULL;
 674        data->conn = NULL;
 675
 676        free_refs(refs_tmp);
 677
 678        for (i = 0; i < nr_heads; i++)
 679                free(origh[i]);
 680        free(origh);
 681        free(heads);
 682        free(dest);
 683        return (refs ? 0 : -1);
 684}
 685
 686static int refs_pushed(struct ref *ref)
 687{
 688        for (; ref; ref = ref->next) {
 689                switch(ref->status) {
 690                case REF_STATUS_NONE:
 691                case REF_STATUS_UPTODATE:
 692                        break;
 693                default:
 694                        return 1;
 695                }
 696        }
 697        return 0;
 698}
 699
 700static void update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 701{
 702        struct refspec rs;
 703
 704        if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 705                return;
 706
 707        rs.src = ref->name;
 708        rs.dst = NULL;
 709
 710        if (!remote_find_tracking(remote, &rs)) {
 711                if (verbose)
 712                        fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 713                if (ref->deletion) {
 714                        delete_ref(rs.dst, NULL, 0);
 715                } else
 716                        update_ref("update by push", rs.dst,
 717                                        ref->new_sha1, NULL, 0, 0);
 718                free(rs.dst);
 719        }
 720}
 721
 722#define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)
 723
 724static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg)
 725{
 726        fprintf(stderr, " %c %-*s ", flag, SUMMARY_WIDTH, summary);
 727        if (from)
 728                fprintf(stderr, "%s -> %s", prettify_ref(from), prettify_ref(to));
 729        else
 730                fputs(prettify_ref(to), stderr);
 731        if (msg) {
 732                fputs(" (", stderr);
 733                fputs(msg, stderr);
 734                fputc(')', stderr);
 735        }
 736        fputc('\n', stderr);
 737}
 738
 739static const char *status_abbrev(unsigned char sha1[20])
 740{
 741        return find_unique_abbrev(sha1, DEFAULT_ABBREV);
 742}
 743
 744static void print_ok_ref_status(struct ref *ref)
 745{
 746        if (ref->deletion)
 747                print_ref_status('-', "[deleted]", ref, NULL, NULL);
 748        else if (is_null_sha1(ref->old_sha1))
 749                print_ref_status('*',
 750                        (!prefixcmp(ref->name, "refs/tags/") ? "[new tag]" :
 751                          "[new branch]"),
 752                        ref, ref->peer_ref, NULL);
 753        else {
 754                char quickref[84];
 755                char type;
 756                const char *msg;
 757
 758                strcpy(quickref, status_abbrev(ref->old_sha1));
 759                if (ref->nonfastforward) {
 760                        strcat(quickref, "...");
 761                        type = '+';
 762                        msg = "forced update";
 763                } else {
 764                        strcat(quickref, "..");
 765                        type = ' ';
 766                        msg = NULL;
 767                }
 768                strcat(quickref, status_abbrev(ref->new_sha1));
 769
 770                print_ref_status(type, quickref, ref, ref->peer_ref, msg);
 771        }
 772}
 773
 774static int print_one_push_status(struct ref *ref, const char *dest, int count)
 775{
 776        if (!count)
 777                fprintf(stderr, "To %s\n", dest);
 778
 779        switch(ref->status) {
 780        case REF_STATUS_NONE:
 781                print_ref_status('X', "[no match]", ref, NULL, NULL);
 782                break;
 783        case REF_STATUS_REJECT_NODELETE:
 784                print_ref_status('!', "[rejected]", ref, NULL,
 785                                "remote does not support deleting refs");
 786                break;
 787        case REF_STATUS_UPTODATE:
 788                print_ref_status('=', "[up to date]", ref,
 789                                ref->peer_ref, NULL);
 790                break;
 791        case REF_STATUS_REJECT_NONFASTFORWARD:
 792                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 793                                "non-fast forward");
 794                break;
 795        case REF_STATUS_REMOTE_REJECT:
 796                print_ref_status('!', "[remote rejected]", ref,
 797                                ref->deletion ? NULL : ref->peer_ref,
 798                                ref->remote_status);
 799                break;
 800        case REF_STATUS_EXPECTING_REPORT:
 801                print_ref_status('!', "[remote failure]", ref,
 802                                ref->deletion ? NULL : ref->peer_ref,
 803                                "remote failed to report status");
 804                break;
 805        case REF_STATUS_OK:
 806                print_ok_ref_status(ref);
 807                break;
 808        }
 809
 810        return 1;
 811}
 812
 813static void print_push_status(const char *dest, struct ref *refs, int verbose)
 814{
 815        struct ref *ref;
 816        int n = 0;
 817
 818        if (verbose) {
 819                for (ref = refs; ref; ref = ref->next)
 820                        if (ref->status == REF_STATUS_UPTODATE)
 821                                n += print_one_push_status(ref, dest, n);
 822        }
 823
 824        for (ref = refs; ref; ref = ref->next)
 825                if (ref->status == REF_STATUS_OK)
 826                        n += print_one_push_status(ref, dest, n);
 827
 828        for (ref = refs; ref; ref = ref->next) {
 829                if (ref->status != REF_STATUS_NONE &&
 830                    ref->status != REF_STATUS_UPTODATE &&
 831                    ref->status != REF_STATUS_OK)
 832                        n += print_one_push_status(ref, dest, n);
 833        }
 834}
 835
 836static void verify_remote_names(int nr_heads, const char **heads)
 837{
 838        int i;
 839
 840        for (i = 0; i < nr_heads; i++) {
 841                const char *local = heads[i];
 842                const char *remote = strrchr(heads[i], ':');
 843
 844                if (*local == '+')
 845                        local++;
 846
 847                /* A matching refspec is okay.  */
 848                if (remote == local && remote[1] == '\0')
 849                        continue;
 850
 851                remote = remote ? (remote + 1) : local;
 852                switch (check_ref_format(remote)) {
 853                case 0: /* ok */
 854                case CHECK_REF_FORMAT_ONELEVEL:
 855                        /* ok but a single level -- that is fine for
 856                         * a match pattern.
 857                         */
 858                case CHECK_REF_FORMAT_WILDCARD:
 859                        /* ok but ends with a pattern-match character */
 860                        continue;
 861                }
 862                die("remote part of refspec is not a valid name in %s",
 863                    heads[i]);
 864        }
 865}
 866
 867static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 868{
 869        struct git_transport_data *data = transport->data;
 870        struct send_pack_args args;
 871        int ret;
 872
 873        if (!data->conn) {
 874                struct ref *tmp_refs;
 875                connect_setup(transport, 1, 0);
 876
 877                get_remote_heads(data->fd[0], &tmp_refs, 0, NULL, REF_NORMAL,
 878                                 NULL);
 879        }
 880
 881        args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 882        args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 883        args.use_thin_pack = data->thin;
 884        args.verbose = !!(flags & TRANSPORT_PUSH_VERBOSE);
 885        args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 886
 887        ret = send_pack(&args, data->fd, data->conn, remote_refs,
 888                        &data->extra_have);
 889
 890        close(data->fd[1]);
 891        close(data->fd[0]);
 892        ret |= finish_connect(data->conn);
 893        data->conn = NULL;
 894
 895        return ret;
 896}
 897
 898static int disconnect_git(struct transport *transport)
 899{
 900        struct git_transport_data *data = transport->data;
 901        if (data->conn) {
 902                packet_flush(data->fd[1]);
 903                close(data->fd[0]);
 904                close(data->fd[1]);
 905                finish_connect(data->conn);
 906        }
 907
 908        free(data);
 909        return 0;
 910}
 911
 912static int is_local(const char *url)
 913{
 914        const char *colon = strchr(url, ':');
 915        const char *slash = strchr(url, '/');
 916        return !colon || (slash && slash < colon) ||
 917                has_dos_drive_prefix(url);
 918}
 919
 920static int is_file(const char *url)
 921{
 922        struct stat buf;
 923        if (stat(url, &buf))
 924                return 0;
 925        return S_ISREG(buf.st_mode);
 926}
 927
 928struct transport *transport_get(struct remote *remote, const char *url)
 929{
 930        struct transport *ret = xcalloc(1, sizeof(*ret));
 931
 932        ret->remote = remote;
 933        ret->url = url;
 934
 935        if (!prefixcmp(url, "rsync://")) {
 936                ret->get_refs_list = get_refs_via_rsync;
 937                ret->fetch = fetch_objs_via_rsync;
 938                ret->push = rsync_transport_push;
 939
 940        } else if (!prefixcmp(url, "http://")
 941                || !prefixcmp(url, "https://")
 942                || !prefixcmp(url, "ftp://")) {
 943#ifdef NO_CURL
 944                error("git was compiled without libcurl support.");
 945#else
 946                ret->get_refs_list = get_refs_via_curl;
 947                ret->fetch = fetch_objs_via_curl;
 948                ret->push = curl_transport_push;
 949#endif
 950                ret->disconnect = disconnect_walker;
 951
 952        } else if (is_local(url) && is_file(url)) {
 953                struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 954                ret->data = data;
 955                ret->get_refs_list = get_refs_from_bundle;
 956                ret->fetch = fetch_refs_from_bundle;
 957                ret->disconnect = close_bundle;
 958
 959        } else {
 960                struct git_transport_data *data = xcalloc(1, sizeof(*data));
 961                ret->data = data;
 962                ret->set_option = set_git_option;
 963                ret->get_refs_list = get_refs_via_connect;
 964                ret->fetch = fetch_refs_via_pack;
 965                ret->push_refs = git_transport_push;
 966                ret->disconnect = disconnect_git;
 967
 968                data->thin = 1;
 969                data->conn = NULL;
 970                data->uploadpack = "git-upload-pack";
 971                if (remote && remote->uploadpack)
 972                        data->uploadpack = remote->uploadpack;
 973                data->receivepack = "git-receive-pack";
 974                if (remote && remote->receivepack)
 975                        data->receivepack = remote->receivepack;
 976        }
 977
 978        return ret;
 979}
 980
 981int transport_set_option(struct transport *transport,
 982                         const char *name, const char *value)
 983{
 984        if (transport->set_option)
 985                return transport->set_option(transport, name, value);
 986        return 1;
 987}
 988
 989int transport_push(struct transport *transport,
 990                   int refspec_nr, const char **refspec, int flags)
 991{
 992        verify_remote_names(refspec_nr, refspec);
 993
 994        if (transport->push)
 995                return transport->push(transport, refspec_nr, refspec, flags);
 996        if (transport->push_refs) {
 997                struct ref *remote_refs =
 998                        transport->get_refs_list(transport, 1);
 999                struct ref **remote_tail;
1000                struct ref *local_refs = get_local_heads();
1001                int match_flags = MATCH_REFS_NONE;
1002                int verbose = flags & TRANSPORT_PUSH_VERBOSE;
1003                int ret;
1004
1005                if (flags & TRANSPORT_PUSH_ALL)
1006                        match_flags |= MATCH_REFS_ALL;
1007                if (flags & TRANSPORT_PUSH_MIRROR)
1008                        match_flags |= MATCH_REFS_MIRROR;
1009
1010                remote_tail = &remote_refs;
1011                while (*remote_tail)
1012                        remote_tail = &((*remote_tail)->next);
1013                if (match_refs(local_refs, remote_refs, &remote_tail,
1014                               refspec_nr, refspec, match_flags)) {
1015                        return -1;
1016                }
1017
1018                ret = transport->push_refs(transport, remote_refs, flags);
1019
1020                print_push_status(transport->url, remote_refs, verbose);
1021
1022                if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
1023                        struct ref *ref;
1024                        for (ref = remote_refs; ref; ref = ref->next)
1025                                update_tracking_ref(transport->remote, ref, verbose);
1026                }
1027
1028                if (!ret && !refs_pushed(remote_refs))
1029                        fprintf(stderr, "Everything up-to-date\n");
1030                return ret;
1031        }
1032        return 1;
1033}
1034
1035const struct ref *transport_get_remote_refs(struct transport *transport)
1036{
1037        if (!transport->remote_refs)
1038                transport->remote_refs = transport->get_refs_list(transport, 0);
1039        return transport->remote_refs;
1040}
1041
1042int transport_fetch_refs(struct transport *transport, const struct ref *refs)
1043{
1044        int rc;
1045        int nr_heads = 0, nr_alloc = 0;
1046        const struct ref **heads = NULL;
1047        const struct ref *rm;
1048
1049        for (rm = refs; rm; rm = rm->next) {
1050                if (rm->peer_ref &&
1051                    !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
1052                        continue;
1053                ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1054                heads[nr_heads++] = rm;
1055        }
1056
1057        rc = transport->fetch(transport, nr_heads, heads);
1058        free(heads);
1059        return rc;
1060}
1061
1062void transport_unlock_pack(struct transport *transport)
1063{
1064        if (transport->pack_lockfile) {
1065                unlink(transport->pack_lockfile);
1066                free(transport->pack_lockfile);
1067                transport->pack_lockfile = NULL;
1068        }
1069}
1070
1071int transport_disconnect(struct transport *transport)
1072{
1073        int ret = 0;
1074        if (transport->disconnect)
1075                ret = transport->disconnect(transport);
1076        free(transport);
1077        return ret;
1078}