Andrew's git / gitweb.git / transport.c
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transport.con commit send-email: Handle "GIT:" rather than "GIT: " during --compose (40e6e8a)
   1#include "cache.h"
   2#include "transport.h"
   3#include "run-command.h"
   4#ifndef NO_CURL
   5#include "http.h"
   6#endif
   7#include "pkt-line.h"
   8#include "fetch-pack.h"
   9#include "send-pack.h"
  10#include "walker.h"
  11#include "bundle.h"
  12#include "dir.h"
  13#include "refs.h"
  14
  15/* rsync support */
  16
  17/*
  18 * We copy packed-refs and refs/ into a temporary file, then read the
  19 * loose refs recursively (sorting whenever possible), and then inserting
  20 * those packed refs that are not yet in the list (not validating, but
  21 * assuming that the file is sorted).
  22 *
  23 * Appears refactoring this from refs.c is too cumbersome.
  24 */
  25
  26static int str_cmp(const void *a, const void *b)
  27{
  28        const char *s1 = a;
  29        const char *s2 = b;
  30
  31        return strcmp(s1, s2);
  32}
  33
  34/* path->buf + name_offset is expected to point to "refs/" */
  35
  36static int read_loose_refs(struct strbuf *path, int name_offset,
  37                struct ref **tail)
  38{
  39        DIR *dir = opendir(path->buf);
  40        struct dirent *de;
  41        struct {
  42                char **entries;
  43                int nr, alloc;
  44        } list;
  45        int i, pathlen;
  46
  47        if (!dir)
  48                return -1;
  49
  50        memset (&list, 0, sizeof(list));
  51
  52        while ((de = readdir(dir))) {
  53                if (is_dot_or_dotdot(de->d_name))
  54                        continue;
  55                ALLOC_GROW(list.entries, list.nr + 1, list.alloc);
  56                list.entries[list.nr++] = xstrdup(de->d_name);
  57        }
  58        closedir(dir);
  59
  60        /* sort the list */
  61
  62        qsort(list.entries, list.nr, sizeof(char *), str_cmp);
  63
  64        pathlen = path->len;
  65        strbuf_addch(path, '/');
  66
  67        for (i = 0; i < list.nr; i++, strbuf_setlen(path, pathlen + 1)) {
  68                strbuf_addstr(path, list.entries[i]);
  69                if (read_loose_refs(path, name_offset, tail)) {
  70                        int fd = open(path->buf, O_RDONLY);
  71                        char buffer[40];
  72                        struct ref *next;
  73
  74                        if (fd < 0)
  75                                continue;
  76                        next = alloc_ref(path->buf + name_offset);
  77                        if (read_in_full(fd, buffer, 40) != 40 ||
  78                                        get_sha1_hex(buffer, next->old_sha1)) {
  79                                close(fd);
  80                                free(next);
  81                                continue;
  82                        }
  83                        close(fd);
  84                        (*tail)->next = next;
  85                        *tail = next;
  86                }
  87        }
  88        strbuf_setlen(path, pathlen);
  89
  90        for (i = 0; i < list.nr; i++)
  91                free(list.entries[i]);
  92        free(list.entries);
  93
  94        return 0;
  95}
  96
  97/* insert the packed refs for which no loose refs were found */
  98
  99static void insert_packed_refs(const char *packed_refs, struct ref **list)
 100{
 101        FILE *f = fopen(packed_refs, "r");
 102        static char buffer[PATH_MAX];
 103
 104        if (!f)
 105                return;
 106
 107        for (;;) {
 108                int cmp = cmp, len;
 109
 110                if (!fgets(buffer, sizeof(buffer), f)) {
 111                        fclose(f);
 112                        return;
 113                }
 114
 115                if (hexval(buffer[0]) > 0xf)
 116                        continue;
 117                len = strlen(buffer);
 118                if (len && buffer[len - 1] == '\n')
 119                        buffer[--len] = '\0';
 120                if (len < 41)
 121                        continue;
 122                while ((*list)->next &&
 123                                (cmp = strcmp(buffer + 41,
 124                                      (*list)->next->name)) > 0)
 125                        list = &(*list)->next;
 126                if (!(*list)->next || cmp < 0) {
 127                        struct ref *next = alloc_ref(buffer + 41);
 128                        buffer[40] = '\0';
 129                        if (get_sha1_hex(buffer, next->old_sha1)) {
 130                                warning ("invalid SHA-1: %s", buffer);
 131                                free(next);
 132                                continue;
 133                        }
 134                        next->next = (*list)->next;
 135                        (*list)->next = next;
 136                        list = &(*list)->next;
 137                }
 138        }
 139}
 140
 141static const char *rsync_url(const char *url)
 142{
 143        return prefixcmp(url, "rsync://") ? skip_prefix(url, "rsync:") : url;
 144}
 145
 146static struct ref *get_refs_via_rsync(struct transport *transport, int for_push)
 147{
 148        struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 149        struct ref dummy, *tail = &dummy;
 150        struct child_process rsync;
 151        const char *args[5];
 152        int temp_dir_len;
 153
 154        if (for_push)
 155                return NULL;
 156
 157        /* copy the refs to the temporary directory */
 158
 159        strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 160        if (!mkdtemp(temp_dir.buf))
 161                die ("Could not make temporary directory");
 162        temp_dir_len = temp_dir.len;
 163
 164        strbuf_addstr(&buf, rsync_url(transport->url));
 165        strbuf_addstr(&buf, "/refs");
 166
 167        memset(&rsync, 0, sizeof(rsync));
 168        rsync.argv = args;
 169        rsync.stdout_to_stderr = 1;
 170        args[0] = "rsync";
 171        args[1] = (transport->verbose > 0) ? "-rv" : "-r";
 172        args[2] = buf.buf;
 173        args[3] = temp_dir.buf;
 174        args[4] = NULL;
 175
 176        if (run_command(&rsync))
 177                die ("Could not run rsync to get refs");
 178
 179        strbuf_reset(&buf);
 180        strbuf_addstr(&buf, rsync_url(transport->url));
 181        strbuf_addstr(&buf, "/packed-refs");
 182
 183        args[2] = buf.buf;
 184
 185        if (run_command(&rsync))
 186                die ("Could not run rsync to get refs");
 187
 188        /* read the copied refs */
 189
 190        strbuf_addstr(&temp_dir, "/refs");
 191        read_loose_refs(&temp_dir, temp_dir_len + 1, &tail);
 192        strbuf_setlen(&temp_dir, temp_dir_len);
 193
 194        tail = &dummy;
 195        strbuf_addstr(&temp_dir, "/packed-refs");
 196        insert_packed_refs(temp_dir.buf, &tail);
 197        strbuf_setlen(&temp_dir, temp_dir_len);
 198
 199        if (remove_dir_recursively(&temp_dir, 0))
 200                warning ("Error removing temporary directory %s.",
 201                                temp_dir.buf);
 202
 203        strbuf_release(&buf);
 204        strbuf_release(&temp_dir);
 205
 206        return dummy.next;
 207}
 208
 209static int fetch_objs_via_rsync(struct transport *transport,
 210                                int nr_objs, const struct ref **to_fetch)
 211{
 212        struct strbuf buf = STRBUF_INIT;
 213        struct child_process rsync;
 214        const char *args[8];
 215        int result;
 216
 217        strbuf_addstr(&buf, rsync_url(transport->url));
 218        strbuf_addstr(&buf, "/objects/");
 219
 220        memset(&rsync, 0, sizeof(rsync));
 221        rsync.argv = args;
 222        rsync.stdout_to_stderr = 1;
 223        args[0] = "rsync";
 224        args[1] = (transport->verbose > 0) ? "-rv" : "-r";
 225        args[2] = "--ignore-existing";
 226        args[3] = "--exclude";
 227        args[4] = "info";
 228        args[5] = buf.buf;
 229        args[6] = get_object_directory();
 230        args[7] = NULL;
 231
 232        /* NEEDSWORK: handle one level of alternates */
 233        result = run_command(&rsync);
 234
 235        strbuf_release(&buf);
 236
 237        return result;
 238}
 239
 240static int write_one_ref(const char *name, const unsigned char *sha1,
 241                int flags, void *data)
 242{
 243        struct strbuf *buf = data;
 244        int len = buf->len;
 245        FILE *f;
 246
 247        /* when called via for_each_ref(), flags is non-zero */
 248        if (flags && prefixcmp(name, "refs/heads/") &&
 249                        prefixcmp(name, "refs/tags/"))
 250                return 0;
 251
 252        strbuf_addstr(buf, name);
 253        if (safe_create_leading_directories(buf->buf) ||
 254                        !(f = fopen(buf->buf, "w")) ||
 255                        fprintf(f, "%s\n", sha1_to_hex(sha1)) < 0 ||
 256                        fclose(f))
 257                return error("problems writing temporary file %s", buf->buf);
 258        strbuf_setlen(buf, len);
 259        return 0;
 260}
 261
 262static int write_refs_to_temp_dir(struct strbuf *temp_dir,
 263                int refspec_nr, const char **refspec)
 264{
 265        int i;
 266
 267        for (i = 0; i < refspec_nr; i++) {
 268                unsigned char sha1[20];
 269                char *ref;
 270
 271                if (dwim_ref(refspec[i], strlen(refspec[i]), sha1, &ref) != 1)
 272                        return error("Could not get ref %s", refspec[i]);
 273
 274                if (write_one_ref(ref, sha1, 0, temp_dir)) {
 275                        free(ref);
 276                        return -1;
 277                }
 278                free(ref);
 279        }
 280        return 0;
 281}
 282
 283static int rsync_transport_push(struct transport *transport,
 284                int refspec_nr, const char **refspec, int flags)
 285{
 286        struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 287        int result = 0, i;
 288        struct child_process rsync;
 289        const char *args[10];
 290
 291        if (flags & TRANSPORT_PUSH_MIRROR)
 292                return error("rsync transport does not support mirror mode");
 293
 294        /* first push the objects */
 295
 296        strbuf_addstr(&buf, rsync_url(transport->url));
 297        strbuf_addch(&buf, '/');
 298
 299        memset(&rsync, 0, sizeof(rsync));
 300        rsync.argv = args;
 301        rsync.stdout_to_stderr = 1;
 302        i = 0;
 303        args[i++] = "rsync";
 304        args[i++] = "-a";
 305        if (flags & TRANSPORT_PUSH_DRY_RUN)
 306                args[i++] = "--dry-run";
 307        if (transport->verbose > 0)
 308                args[i++] = "-v";
 309        args[i++] = "--ignore-existing";
 310        args[i++] = "--exclude";
 311        args[i++] = "info";
 312        args[i++] = get_object_directory();
 313        args[i++] = buf.buf;
 314        args[i++] = NULL;
 315
 316        if (run_command(&rsync))
 317                return error("Could not push objects to %s",
 318                                rsync_url(transport->url));
 319
 320        /* copy the refs to the temporary directory; they could be packed. */
 321
 322        strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 323        if (!mkdtemp(temp_dir.buf))
 324                die ("Could not make temporary directory");
 325        strbuf_addch(&temp_dir, '/');
 326
 327        if (flags & TRANSPORT_PUSH_ALL) {
 328                if (for_each_ref(write_one_ref, &temp_dir))
 329                        return -1;
 330        } else if (write_refs_to_temp_dir(&temp_dir, refspec_nr, refspec))
 331                return -1;
 332
 333        i = 2;
 334        if (flags & TRANSPORT_PUSH_DRY_RUN)
 335                args[i++] = "--dry-run";
 336        if (!(flags & TRANSPORT_PUSH_FORCE))
 337                args[i++] = "--ignore-existing";
 338        args[i++] = temp_dir.buf;
 339        args[i++] = rsync_url(transport->url);
 340        args[i++] = NULL;
 341        if (run_command(&rsync))
 342                result = error("Could not push to %s",
 343                                rsync_url(transport->url));
 344
 345        if (remove_dir_recursively(&temp_dir, 0))
 346                warning ("Could not remove temporary directory %s.",
 347                                temp_dir.buf);
 348
 349        strbuf_release(&buf);
 350        strbuf_release(&temp_dir);
 351
 352        return result;
 353}
 354
 355/* Generic functions for using commit walkers */
 356
 357#ifndef NO_CURL /* http fetch is the only user */
 358static int fetch_objs_via_walker(struct transport *transport,
 359                                 int nr_objs, const struct ref **to_fetch)
 360{
 361        char *dest = xstrdup(transport->url);
 362        struct walker *walker = transport->data;
 363        char **objs = xmalloc(nr_objs * sizeof(*objs));
 364        int i;
 365
 366        walker->get_all = 1;
 367        walker->get_tree = 1;
 368        walker->get_history = 1;
 369        walker->get_verbosely = transport->verbose >= 0;
 370        walker->get_recover = 0;
 371
 372        for (i = 0; i < nr_objs; i++)
 373                objs[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 374
 375        if (walker_fetch(walker, nr_objs, objs, NULL, NULL))
 376                die("Fetch failed.");
 377
 378        for (i = 0; i < nr_objs; i++)
 379                free(objs[i]);
 380        free(objs);
 381        free(dest);
 382        return 0;
 383}
 384#endif /* NO_CURL */
 385
 386static int disconnect_walker(struct transport *transport)
 387{
 388        struct walker *walker = transport->data;
 389        if (walker)
 390                walker_free(walker);
 391        return 0;
 392}
 393
 394#ifndef NO_CURL
 395static int curl_transport_push(struct transport *transport, int refspec_nr, const char **refspec, int flags)
 396{
 397        const char **argv;
 398        int argc;
 399        int err;
 400
 401        if (flags & TRANSPORT_PUSH_MIRROR)
 402                return error("http transport does not support mirror mode");
 403
 404        argv = xmalloc((refspec_nr + 12) * sizeof(char *));
 405        argv[0] = "http-push";
 406        argc = 1;
 407        if (flags & TRANSPORT_PUSH_ALL)
 408                argv[argc++] = "--all";
 409        if (flags & TRANSPORT_PUSH_FORCE)
 410                argv[argc++] = "--force";
 411        if (flags & TRANSPORT_PUSH_DRY_RUN)
 412                argv[argc++] = "--dry-run";
 413        if (flags & TRANSPORT_PUSH_VERBOSE)
 414                argv[argc++] = "--verbose";
 415        argv[argc++] = transport->url;
 416        while (refspec_nr--)
 417                argv[argc++] = *refspec++;
 418        argv[argc] = NULL;
 419        err = run_command_v_opt(argv, RUN_GIT_CMD);
 420        switch (err) {
 421        case -ERR_RUN_COMMAND_FORK:
 422                error("unable to fork for %s", argv[0]);
 423        case -ERR_RUN_COMMAND_EXEC:
 424                error("unable to exec %s", argv[0]);
 425                break;
 426        case -ERR_RUN_COMMAND_WAITPID:
 427        case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
 428        case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
 429        case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
 430                error("%s died with strange error", argv[0]);
 431        }
 432        return !!err;
 433}
 434
 435static struct ref *get_refs_via_curl(struct transport *transport, int for_push)
 436{
 437        struct strbuf buffer = STRBUF_INIT;
 438        char *data, *start, *mid;
 439        char *ref_name;
 440        char *refs_url;
 441        int i = 0;
 442
 443        struct active_request_slot *slot;
 444        struct slot_results results;
 445
 446        struct ref *refs = NULL;
 447        struct ref *ref = NULL;
 448        struct ref *last_ref = NULL;
 449
 450        struct walker *walker;
 451
 452        if (for_push)
 453                return NULL;
 454
 455        if (!transport->data)
 456                transport->data = get_http_walker(transport->url,
 457                                                transport->remote);
 458
 459        walker = transport->data;
 460
 461        refs_url = xmalloc(strlen(transport->url) + 11);
 462        sprintf(refs_url, "%s/info/refs", transport->url);
 463
 464        slot = get_active_slot();
 465        slot->results = &results;
 466        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
 467        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 468        curl_easy_setopt(slot->curl, CURLOPT_URL, refs_url);
 469        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
 470
 471        if (start_active_slot(slot)) {
 472                run_active_slot(slot);
 473                if (results.curl_result != CURLE_OK) {
 474                        strbuf_release(&buffer);
 475                        if (missing_target(&results))
 476                                die("%s not found: did you run git update-server-info on the server?", refs_url);
 477                        else
 478                                die("%s download error - %s", refs_url, curl_errorstr);
 479                }
 480        } else {
 481                strbuf_release(&buffer);
 482                die("Unable to start HTTP request");
 483        }
 484
 485        data = buffer.buf;
 486        start = NULL;
 487        mid = data;
 488        while (i < buffer.len) {
 489                if (!start)
 490                        start = &data[i];
 491                if (data[i] == '\t')
 492                        mid = &data[i];
 493                if (data[i] == '\n') {
 494                        data[i] = 0;
 495                        ref_name = mid + 1;
 496                        ref = xmalloc(sizeof(struct ref) +
 497                                      strlen(ref_name) + 1);
 498                        memset(ref, 0, sizeof(struct ref));
 499                        strcpy(ref->name, ref_name);
 500                        get_sha1_hex(start, ref->old_sha1);
 501                        if (!refs)
 502                                refs = ref;
 503                        if (last_ref)
 504                                last_ref->next = ref;
 505                        last_ref = ref;
 506                        start = NULL;
 507                }
 508                i++;
 509        }
 510
 511        strbuf_release(&buffer);
 512
 513        ref = alloc_ref("HEAD");
 514        if (!walker->fetch_ref(walker, ref) &&
 515            !resolve_remote_symref(ref, refs)) {
 516                ref->next = refs;
 517                refs = ref;
 518        } else {
 519                free(ref);
 520        }
 521
 522        return refs;
 523}
 524
 525static int fetch_objs_via_curl(struct transport *transport,
 526                                 int nr_objs, const struct ref **to_fetch)
 527{
 528        if (!transport->data)
 529                transport->data = get_http_walker(transport->url,
 530                                                transport->remote);
 531        return fetch_objs_via_walker(transport, nr_objs, to_fetch);
 532}
 533
 534#endif
 535
 536struct bundle_transport_data {
 537        int fd;
 538        struct bundle_header header;
 539};
 540
 541static struct ref *get_refs_from_bundle(struct transport *transport, int for_push)
 542{
 543        struct bundle_transport_data *data = transport->data;
 544        struct ref *result = NULL;
 545        int i;
 546
 547        if (for_push)
 548                return NULL;
 549
 550        if (data->fd > 0)
 551                close(data->fd);
 552        data->fd = read_bundle_header(transport->url, &data->header);
 553        if (data->fd < 0)
 554                die ("Could not read bundle '%s'.", transport->url);
 555        for (i = 0; i < data->header.references.nr; i++) {
 556                struct ref_list_entry *e = data->header.references.list + i;
 557                struct ref *ref = alloc_ref(e->name);
 558                hashcpy(ref->old_sha1, e->sha1);
 559                ref->next = result;
 560                result = ref;
 561        }
 562        return result;
 563}
 564
 565static int fetch_refs_from_bundle(struct transport *transport,
 566                               int nr_heads, const struct ref **to_fetch)
 567{
 568        struct bundle_transport_data *data = transport->data;
 569        return unbundle(&data->header, data->fd);
 570}
 571
 572static int close_bundle(struct transport *transport)
 573{
 574        struct bundle_transport_data *data = transport->data;
 575        if (data->fd > 0)
 576                close(data->fd);
 577        free(data);
 578        return 0;
 579}
 580
 581struct git_transport_data {
 582        unsigned thin : 1;
 583        unsigned keep : 1;
 584        unsigned followtags : 1;
 585        int depth;
 586        struct child_process *conn;
 587        int fd[2];
 588        const char *uploadpack;
 589        const char *receivepack;
 590        struct extra_have_objects extra_have;
 591};
 592
 593static int set_git_option(struct transport *connection,
 594                          const char *name, const char *value)
 595{
 596        struct git_transport_data *data = connection->data;
 597        if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 598                data->uploadpack = value;
 599                return 0;
 600        } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 601                data->receivepack = value;
 602                return 0;
 603        } else if (!strcmp(name, TRANS_OPT_THIN)) {
 604                data->thin = !!value;
 605                return 0;
 606        } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
 607                data->followtags = !!value;
 608                return 0;
 609        } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 610                data->keep = !!value;
 611                return 0;
 612        } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 613                if (!value)
 614                        data->depth = 0;
 615                else
 616                        data->depth = atoi(value);
 617                return 0;
 618        }
 619        return 1;
 620}
 621
 622static int connect_setup(struct transport *transport, int for_push, int verbose)
 623{
 624        struct git_transport_data *data = transport->data;
 625        data->conn = git_connect(data->fd, transport->url,
 626                                 for_push ? data->receivepack : data->uploadpack,
 627                                 verbose ? CONNECT_VERBOSE : 0);
 628        return 0;
 629}
 630
 631static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
 632{
 633        struct git_transport_data *data = transport->data;
 634        struct ref *refs;
 635
 636        connect_setup(transport, for_push, 0);
 637        get_remote_heads(data->fd[0], &refs, 0, NULL,
 638                         for_push ? REF_NORMAL : 0, &data->extra_have);
 639
 640        return refs;
 641}
 642
 643static int fetch_refs_via_pack(struct transport *transport,
 644                               int nr_heads, const struct ref **to_fetch)
 645{
 646        struct git_transport_data *data = transport->data;
 647        char **heads = xmalloc(nr_heads * sizeof(*heads));
 648        char **origh = xmalloc(nr_heads * sizeof(*origh));
 649        const struct ref *refs;
 650        char *dest = xstrdup(transport->url);
 651        struct fetch_pack_args args;
 652        int i;
 653        struct ref *refs_tmp = NULL;
 654
 655        memset(&args, 0, sizeof(args));
 656        args.uploadpack = data->uploadpack;
 657        args.keep_pack = data->keep;
 658        args.lock_pack = 1;
 659        args.use_thin_pack = data->thin;
 660        args.include_tag = data->followtags;
 661        args.verbose = (transport->verbose > 0);
 662        args.quiet = (transport->verbose < 0);
 663        args.no_progress = args.quiet || (!transport->progress && !isatty(1));
 664        args.depth = data->depth;
 665
 666        for (i = 0; i < nr_heads; i++)
 667                origh[i] = heads[i] = xstrdup(to_fetch[i]->name);
 668
 669        if (!data->conn) {
 670                connect_setup(transport, 0, 0);
 671                get_remote_heads(data->fd[0], &refs_tmp, 0, NULL, 0, NULL);
 672        }
 673
 674        refs = fetch_pack(&args, data->fd, data->conn,
 675                          refs_tmp ? refs_tmp : transport->remote_refs,
 676                          dest, nr_heads, heads, &transport->pack_lockfile);
 677        close(data->fd[0]);
 678        close(data->fd[1]);
 679        if (finish_connect(data->conn))
 680                refs = NULL;
 681        data->conn = NULL;
 682
 683        free_refs(refs_tmp);
 684
 685        for (i = 0; i < nr_heads; i++)
 686                free(origh[i]);
 687        free(origh);
 688        free(heads);
 689        free(dest);
 690        return (refs ? 0 : -1);
 691}
 692
 693static int refs_pushed(struct ref *ref)
 694{
 695        for (; ref; ref = ref->next) {
 696                switch(ref->status) {
 697                case REF_STATUS_NONE:
 698                case REF_STATUS_UPTODATE:
 699                        break;
 700                default:
 701                        return 1;
 702                }
 703        }
 704        return 0;
 705}
 706
 707static void update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 708{
 709        struct refspec rs;
 710
 711        if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 712                return;
 713
 714        rs.src = ref->name;
 715        rs.dst = NULL;
 716
 717        if (!remote_find_tracking(remote, &rs)) {
 718                if (verbose)
 719                        fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 720                if (ref->deletion) {
 721                        delete_ref(rs.dst, NULL, 0);
 722                } else
 723                        update_ref("update by push", rs.dst,
 724                                        ref->new_sha1, NULL, 0, 0);
 725                free(rs.dst);
 726        }
 727}
 728
 729#define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)
 730
 731static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg)
 732{
 733        fprintf(stderr, " %c %-*s ", flag, SUMMARY_WIDTH, summary);
 734        if (from)
 735                fprintf(stderr, "%s -> %s", prettify_ref(from), prettify_ref(to));
 736        else
 737                fputs(prettify_ref(to), stderr);
 738        if (msg) {
 739                fputs(" (", stderr);
 740                fputs(msg, stderr);
 741                fputc(')', stderr);
 742        }
 743        fputc('\n', stderr);
 744}
 745
 746static const char *status_abbrev(unsigned char sha1[20])
 747{
 748        return find_unique_abbrev(sha1, DEFAULT_ABBREV);
 749}
 750
 751static void print_ok_ref_status(struct ref *ref)
 752{
 753        if (ref->deletion)
 754                print_ref_status('-', "[deleted]", ref, NULL, NULL);
 755        else if (is_null_sha1(ref->old_sha1))
 756                print_ref_status('*',
 757                        (!prefixcmp(ref->name, "refs/tags/") ? "[new tag]" :
 758                          "[new branch]"),
 759                        ref, ref->peer_ref, NULL);
 760        else {
 761                char quickref[84];
 762                char type;
 763                const char *msg;
 764
 765                strcpy(quickref, status_abbrev(ref->old_sha1));
 766                if (ref->nonfastforward) {
 767                        strcat(quickref, "...");
 768                        type = '+';
 769                        msg = "forced update";
 770                } else {
 771                        strcat(quickref, "..");
 772                        type = ' ';
 773                        msg = NULL;
 774                }
 775                strcat(quickref, status_abbrev(ref->new_sha1));
 776
 777                print_ref_status(type, quickref, ref, ref->peer_ref, msg);
 778        }
 779}
 780
 781static int print_one_push_status(struct ref *ref, const char *dest, int count)
 782{
 783        if (!count)
 784                fprintf(stderr, "To %s\n", dest);
 785
 786        switch(ref->status) {
 787        case REF_STATUS_NONE:
 788                print_ref_status('X', "[no match]", ref, NULL, NULL);
 789                break;
 790        case REF_STATUS_REJECT_NODELETE:
 791                print_ref_status('!', "[rejected]", ref, NULL,
 792                                "remote does not support deleting refs");
 793                break;
 794        case REF_STATUS_UPTODATE:
 795                print_ref_status('=', "[up to date]", ref,
 796                                ref->peer_ref, NULL);
 797                break;
 798        case REF_STATUS_REJECT_NONFASTFORWARD:
 799                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 800                                "non-fast forward");
 801                break;
 802        case REF_STATUS_REMOTE_REJECT:
 803                print_ref_status('!', "[remote rejected]", ref,
 804                                ref->deletion ? NULL : ref->peer_ref,
 805                                ref->remote_status);
 806                break;
 807        case REF_STATUS_EXPECTING_REPORT:
 808                print_ref_status('!', "[remote failure]", ref,
 809                                ref->deletion ? NULL : ref->peer_ref,
 810                                "remote failed to report status");
 811                break;
 812        case REF_STATUS_OK:
 813                print_ok_ref_status(ref);
 814                break;
 815        }
 816
 817        return 1;
 818}
 819
 820static void print_push_status(const char *dest, struct ref *refs, int verbose)
 821{
 822        struct ref *ref;
 823        int n = 0;
 824
 825        if (verbose) {
 826                for (ref = refs; ref; ref = ref->next)
 827                        if (ref->status == REF_STATUS_UPTODATE)
 828                                n += print_one_push_status(ref, dest, n);
 829        }
 830
 831        for (ref = refs; ref; ref = ref->next)
 832                if (ref->status == REF_STATUS_OK)
 833                        n += print_one_push_status(ref, dest, n);
 834
 835        for (ref = refs; ref; ref = ref->next) {
 836                if (ref->status != REF_STATUS_NONE &&
 837                    ref->status != REF_STATUS_UPTODATE &&
 838                    ref->status != REF_STATUS_OK)
 839                        n += print_one_push_status(ref, dest, n);
 840        }
 841}
 842
 843static void verify_remote_names(int nr_heads, const char **heads)
 844{
 845        int i;
 846
 847        for (i = 0; i < nr_heads; i++) {
 848                const char *local = heads[i];
 849                const char *remote = strrchr(heads[i], ':');
 850
 851                if (*local == '+')
 852                        local++;
 853
 854                /* A matching refspec is okay.  */
 855                if (remote == local && remote[1] == '\0')
 856                        continue;
 857
 858                remote = remote ? (remote + 1) : local;
 859                switch (check_ref_format(remote)) {
 860                case 0: /* ok */
 861                case CHECK_REF_FORMAT_ONELEVEL:
 862                        /* ok but a single level -- that is fine for
 863                         * a match pattern.
 864                         */
 865                case CHECK_REF_FORMAT_WILDCARD:
 866                        /* ok but ends with a pattern-match character */
 867                        continue;
 868                }
 869                die("remote part of refspec is not a valid name in %s",
 870                    heads[i]);
 871        }
 872}
 873
 874static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 875{
 876        struct git_transport_data *data = transport->data;
 877        struct send_pack_args args;
 878        int ret;
 879
 880        if (!data->conn) {
 881                struct ref *tmp_refs;
 882                connect_setup(transport, 1, 0);
 883
 884                get_remote_heads(data->fd[0], &tmp_refs, 0, NULL, REF_NORMAL,
 885                                 NULL);
 886        }
 887
 888        args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 889        args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 890        args.use_thin_pack = data->thin;
 891        args.verbose = !!(flags & TRANSPORT_PUSH_VERBOSE);
 892        args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 893
 894        ret = send_pack(&args, data->fd, data->conn, remote_refs,
 895                        &data->extra_have);
 896
 897        close(data->fd[1]);
 898        close(data->fd[0]);
 899        ret |= finish_connect(data->conn);
 900        data->conn = NULL;
 901
 902        return ret;
 903}
 904
 905static int disconnect_git(struct transport *transport)
 906{
 907        struct git_transport_data *data = transport->data;
 908        if (data->conn) {
 909                packet_flush(data->fd[1]);
 910                close(data->fd[0]);
 911                close(data->fd[1]);
 912                finish_connect(data->conn);
 913        }
 914
 915        free(data);
 916        return 0;
 917}
 918
 919static int is_local(const char *url)
 920{
 921        const char *colon = strchr(url, ':');
 922        const char *slash = strchr(url, '/');
 923        return !colon || (slash && slash < colon) ||
 924                has_dos_drive_prefix(url);
 925}
 926
 927static int is_file(const char *url)
 928{
 929        struct stat buf;
 930        if (stat(url, &buf))
 931                return 0;
 932        return S_ISREG(buf.st_mode);
 933}
 934
 935struct transport *transport_get(struct remote *remote, const char *url)
 936{
 937        struct transport *ret = xcalloc(1, sizeof(*ret));
 938
 939        ret->remote = remote;
 940        ret->url = url;
 941
 942        if (!prefixcmp(url, "rsync:")) {
 943                ret->get_refs_list = get_refs_via_rsync;
 944                ret->fetch = fetch_objs_via_rsync;
 945                ret->push = rsync_transport_push;
 946
 947        } else if (!prefixcmp(url, "http://")
 948                || !prefixcmp(url, "https://")
 949                || !prefixcmp(url, "ftp://")) {
 950#ifdef NO_CURL
 951                error("git was compiled without libcurl support.");
 952#else
 953                ret->get_refs_list = get_refs_via_curl;
 954                ret->fetch = fetch_objs_via_curl;
 955                ret->push = curl_transport_push;
 956#endif
 957                ret->disconnect = disconnect_walker;
 958
 959        } else if (is_local(url) && is_file(url)) {
 960                struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 961                ret->data = data;
 962                ret->get_refs_list = get_refs_from_bundle;
 963                ret->fetch = fetch_refs_from_bundle;
 964                ret->disconnect = close_bundle;
 965
 966        } else {
 967                struct git_transport_data *data = xcalloc(1, sizeof(*data));
 968                ret->data = data;
 969                ret->set_option = set_git_option;
 970                ret->get_refs_list = get_refs_via_connect;
 971                ret->fetch = fetch_refs_via_pack;
 972                ret->push_refs = git_transport_push;
 973                ret->disconnect = disconnect_git;
 974
 975                data->thin = 1;
 976                data->conn = NULL;
 977                data->uploadpack = "git-upload-pack";
 978                if (remote && remote->uploadpack)
 979                        data->uploadpack = remote->uploadpack;
 980                data->receivepack = "git-receive-pack";
 981                if (remote && remote->receivepack)
 982                        data->receivepack = remote->receivepack;
 983        }
 984
 985        return ret;
 986}
 987
 988int transport_set_option(struct transport *transport,
 989                         const char *name, const char *value)
 990{
 991        if (transport->set_option)
 992                return transport->set_option(transport, name, value);
 993        return 1;
 994}
 995
 996int transport_push(struct transport *transport,
 997                   int refspec_nr, const char **refspec, int flags)
 998{
 999        verify_remote_names(refspec_nr, refspec);
1000
1001        if (transport->push)
1002                return transport->push(transport, refspec_nr, refspec, flags);
1003        if (transport->push_refs) {
1004                struct ref *remote_refs =
1005                        transport->get_refs_list(transport, 1);
1006                struct ref **remote_tail;
1007                struct ref *local_refs = get_local_heads();
1008                int match_flags = MATCH_REFS_NONE;
1009                int verbose = flags & TRANSPORT_PUSH_VERBOSE;
1010                int ret;
1011
1012                if (flags & TRANSPORT_PUSH_ALL)
1013                        match_flags |= MATCH_REFS_ALL;
1014                if (flags & TRANSPORT_PUSH_MIRROR)
1015                        match_flags |= MATCH_REFS_MIRROR;
1016
1017                remote_tail = &remote_refs;
1018                while (*remote_tail)
1019                        remote_tail = &((*remote_tail)->next);
1020                if (match_refs(local_refs, remote_refs, &remote_tail,
1021                               refspec_nr, refspec, match_flags)) {
1022                        return -1;
1023                }
1024
1025                ret = transport->push_refs(transport, remote_refs, flags);
1026
1027                print_push_status(transport->url, remote_refs, verbose);
1028
1029                if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
1030                        struct ref *ref;
1031                        for (ref = remote_refs; ref; ref = ref->next)
1032                                update_tracking_ref(transport->remote, ref, verbose);
1033                }
1034
1035                if (!ret && !refs_pushed(remote_refs))
1036                        fprintf(stderr, "Everything up-to-date\n");
1037                return ret;
1038        }
1039        return 1;
1040}
1041
1042const struct ref *transport_get_remote_refs(struct transport *transport)
1043{
1044        if (!transport->remote_refs)
1045                transport->remote_refs = transport->get_refs_list(transport, 0);
1046        return transport->remote_refs;
1047}
1048
1049int transport_fetch_refs(struct transport *transport, const struct ref *refs)
1050{
1051        int rc;
1052        int nr_heads = 0, nr_alloc = 0;
1053        const struct ref **heads = NULL;
1054        const struct ref *rm;
1055
1056        for (rm = refs; rm; rm = rm->next) {
1057                if (rm->peer_ref &&
1058                    !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
1059                        continue;
1060                ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1061                heads[nr_heads++] = rm;
1062        }
1063
1064        rc = transport->fetch(transport, nr_heads, heads);
1065        free(heads);
1066        return rc;
1067}
1068
1069void transport_unlock_pack(struct transport *transport)
1070{
1071        if (transport->pack_lockfile) {
1072                unlink(transport->pack_lockfile);
1073                free(transport->pack_lockfile);
1074                transport->pack_lockfile = NULL;
1075        }
1076}
1077
1078int transport_disconnect(struct transport *transport)
1079{
1080        int ret = 0;
1081        if (transport->disconnect)
1082                ret = transport->disconnect(transport);
1083        free(transport);
1084        return ret;
1085}