Andrew's git / gitweb.git / transport.c
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transport.con commit Makefile: clean up http-walker.o dependency rules (066ddda)
   1#include "cache.h"
   2#include "transport.h"
   3#include "run-command.h"
   4#include "pkt-line.h"
   5#include "fetch-pack.h"
   6#include "send-pack.h"
   7#include "walker.h"
   8#include "bundle.h"
   9#include "dir.h"
  10#include "refs.h"
  11
  12/* rsync support */
  13
  14/*
  15 * We copy packed-refs and refs/ into a temporary file, then read the
  16 * loose refs recursively (sorting whenever possible), and then inserting
  17 * those packed refs that are not yet in the list (not validating, but
  18 * assuming that the file is sorted).
  19 *
  20 * Appears refactoring this from refs.c is too cumbersome.
  21 */
  22
  23static int str_cmp(const void *a, const void *b)
  24{
  25        const char *s1 = a;
  26        const char *s2 = b;
  27
  28        return strcmp(s1, s2);
  29}
  30
  31/* path->buf + name_offset is expected to point to "refs/" */
  32
  33static int read_loose_refs(struct strbuf *path, int name_offset,
  34                struct ref **tail)
  35{
  36        DIR *dir = opendir(path->buf);
  37        struct dirent *de;
  38        struct {
  39                char **entries;
  40                int nr, alloc;
  41        } list;
  42        int i, pathlen;
  43
  44        if (!dir)
  45                return -1;
  46
  47        memset (&list, 0, sizeof(list));
  48
  49        while ((de = readdir(dir))) {
  50                if (is_dot_or_dotdot(de->d_name))
  51                        continue;
  52                ALLOC_GROW(list.entries, list.nr + 1, list.alloc);
  53                list.entries[list.nr++] = xstrdup(de->d_name);
  54        }
  55        closedir(dir);
  56
  57        /* sort the list */
  58
  59        qsort(list.entries, list.nr, sizeof(char *), str_cmp);
  60
  61        pathlen = path->len;
  62        strbuf_addch(path, '/');
  63
  64        for (i = 0; i < list.nr; i++, strbuf_setlen(path, pathlen + 1)) {
  65                strbuf_addstr(path, list.entries[i]);
  66                if (read_loose_refs(path, name_offset, tail)) {
  67                        int fd = open(path->buf, O_RDONLY);
  68                        char buffer[40];
  69                        struct ref *next;
  70
  71                        if (fd < 0)
  72                                continue;
  73                        next = alloc_ref(path->buf + name_offset);
  74                        if (read_in_full(fd, buffer, 40) != 40 ||
  75                                        get_sha1_hex(buffer, next->old_sha1)) {
  76                                close(fd);
  77                                free(next);
  78                                continue;
  79                        }
  80                        close(fd);
  81                        (*tail)->next = next;
  82                        *tail = next;
  83                }
  84        }
  85        strbuf_setlen(path, pathlen);
  86
  87        for (i = 0; i < list.nr; i++)
  88                free(list.entries[i]);
  89        free(list.entries);
  90
  91        return 0;
  92}
  93
  94/* insert the packed refs for which no loose refs were found */
  95
  96static void insert_packed_refs(const char *packed_refs, struct ref **list)
  97{
  98        FILE *f = fopen(packed_refs, "r");
  99        static char buffer[PATH_MAX];
 100
 101        if (!f)
 102                return;
 103
 104        for (;;) {
 105                int cmp = cmp, len;
 106
 107                if (!fgets(buffer, sizeof(buffer), f)) {
 108                        fclose(f);
 109                        return;
 110                }
 111
 112                if (hexval(buffer[0]) > 0xf)
 113                        continue;
 114                len = strlen(buffer);
 115                if (len && buffer[len - 1] == '\n')
 116                        buffer[--len] = '\0';
 117                if (len < 41)
 118                        continue;
 119                while ((*list)->next &&
 120                                (cmp = strcmp(buffer + 41,
 121                                      (*list)->next->name)) > 0)
 122                        list = &(*list)->next;
 123                if (!(*list)->next || cmp < 0) {
 124                        struct ref *next = alloc_ref(buffer + 41);
 125                        buffer[40] = '\0';
 126                        if (get_sha1_hex(buffer, next->old_sha1)) {
 127                                warning ("invalid SHA-1: %s", buffer);
 128                                free(next);
 129                                continue;
 130                        }
 131                        next->next = (*list)->next;
 132                        (*list)->next = next;
 133                        list = &(*list)->next;
 134                }
 135        }
 136}
 137
 138static const char *rsync_url(const char *url)
 139{
 140        return prefixcmp(url, "rsync://") ? skip_prefix(url, "rsync:") : url;
 141}
 142
 143static struct ref *get_refs_via_rsync(struct transport *transport, int for_push)
 144{
 145        struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 146        struct ref dummy = {0}, *tail = &dummy;
 147        struct child_process rsync;
 148        const char *args[5];
 149        int temp_dir_len;
 150
 151        if (for_push)
 152                return NULL;
 153
 154        /* copy the refs to the temporary directory */
 155
 156        strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 157        if (!mkdtemp(temp_dir.buf))
 158                die_errno ("Could not make temporary directory");
 159        temp_dir_len = temp_dir.len;
 160
 161        strbuf_addstr(&buf, rsync_url(transport->url));
 162        strbuf_addstr(&buf, "/refs");
 163
 164        memset(&rsync, 0, sizeof(rsync));
 165        rsync.argv = args;
 166        rsync.stdout_to_stderr = 1;
 167        args[0] = "rsync";
 168        args[1] = (transport->verbose > 0) ? "-rv" : "-r";
 169        args[2] = buf.buf;
 170        args[3] = temp_dir.buf;
 171        args[4] = NULL;
 172
 173        if (run_command(&rsync))
 174                die ("Could not run rsync to get refs");
 175
 176        strbuf_reset(&buf);
 177        strbuf_addstr(&buf, rsync_url(transport->url));
 178        strbuf_addstr(&buf, "/packed-refs");
 179
 180        args[2] = buf.buf;
 181
 182        if (run_command(&rsync))
 183                die ("Could not run rsync to get refs");
 184
 185        /* read the copied refs */
 186
 187        strbuf_addstr(&temp_dir, "/refs");
 188        read_loose_refs(&temp_dir, temp_dir_len + 1, &tail);
 189        strbuf_setlen(&temp_dir, temp_dir_len);
 190
 191        tail = &dummy;
 192        strbuf_addstr(&temp_dir, "/packed-refs");
 193        insert_packed_refs(temp_dir.buf, &tail);
 194        strbuf_setlen(&temp_dir, temp_dir_len);
 195
 196        if (remove_dir_recursively(&temp_dir, 0))
 197                warning ("Error removing temporary directory %s.",
 198                                temp_dir.buf);
 199
 200        strbuf_release(&buf);
 201        strbuf_release(&temp_dir);
 202
 203        return dummy.next;
 204}
 205
 206static int fetch_objs_via_rsync(struct transport *transport,
 207                                int nr_objs, const struct ref **to_fetch)
 208{
 209        struct strbuf buf = STRBUF_INIT;
 210        struct child_process rsync;
 211        const char *args[8];
 212        int result;
 213
 214        strbuf_addstr(&buf, rsync_url(transport->url));
 215        strbuf_addstr(&buf, "/objects/");
 216
 217        memset(&rsync, 0, sizeof(rsync));
 218        rsync.argv = args;
 219        rsync.stdout_to_stderr = 1;
 220        args[0] = "rsync";
 221        args[1] = (transport->verbose > 0) ? "-rv" : "-r";
 222        args[2] = "--ignore-existing";
 223        args[3] = "--exclude";
 224        args[4] = "info";
 225        args[5] = buf.buf;
 226        args[6] = get_object_directory();
 227        args[7] = NULL;
 228
 229        /* NEEDSWORK: handle one level of alternates */
 230        result = run_command(&rsync);
 231
 232        strbuf_release(&buf);
 233
 234        return result;
 235}
 236
 237static int write_one_ref(const char *name, const unsigned char *sha1,
 238                int flags, void *data)
 239{
 240        struct strbuf *buf = data;
 241        int len = buf->len;
 242        FILE *f;
 243
 244        /* when called via for_each_ref(), flags is non-zero */
 245        if (flags && prefixcmp(name, "refs/heads/") &&
 246                        prefixcmp(name, "refs/tags/"))
 247                return 0;
 248
 249        strbuf_addstr(buf, name);
 250        if (safe_create_leading_directories(buf->buf) ||
 251                        !(f = fopen(buf->buf, "w")) ||
 252                        fprintf(f, "%s\n", sha1_to_hex(sha1)) < 0 ||
 253                        fclose(f))
 254                return error("problems writing temporary file %s", buf->buf);
 255        strbuf_setlen(buf, len);
 256        return 0;
 257}
 258
 259static int write_refs_to_temp_dir(struct strbuf *temp_dir,
 260                int refspec_nr, const char **refspec)
 261{
 262        int i;
 263
 264        for (i = 0; i < refspec_nr; i++) {
 265                unsigned char sha1[20];
 266                char *ref;
 267
 268                if (dwim_ref(refspec[i], strlen(refspec[i]), sha1, &ref) != 1)
 269                        return error("Could not get ref %s", refspec[i]);
 270
 271                if (write_one_ref(ref, sha1, 0, temp_dir)) {
 272                        free(ref);
 273                        return -1;
 274                }
 275                free(ref);
 276        }
 277        return 0;
 278}
 279
 280static int rsync_transport_push(struct transport *transport,
 281                int refspec_nr, const char **refspec, int flags)
 282{
 283        struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 284        int result = 0, i;
 285        struct child_process rsync;
 286        const char *args[10];
 287
 288        if (flags & TRANSPORT_PUSH_MIRROR)
 289                return error("rsync transport does not support mirror mode");
 290
 291        /* first push the objects */
 292
 293        strbuf_addstr(&buf, rsync_url(transport->url));
 294        strbuf_addch(&buf, '/');
 295
 296        memset(&rsync, 0, sizeof(rsync));
 297        rsync.argv = args;
 298        rsync.stdout_to_stderr = 1;
 299        i = 0;
 300        args[i++] = "rsync";
 301        args[i++] = "-a";
 302        if (flags & TRANSPORT_PUSH_DRY_RUN)
 303                args[i++] = "--dry-run";
 304        if (transport->verbose > 0)
 305                args[i++] = "-v";
 306        args[i++] = "--ignore-existing";
 307        args[i++] = "--exclude";
 308        args[i++] = "info";
 309        args[i++] = get_object_directory();
 310        args[i++] = buf.buf;
 311        args[i++] = NULL;
 312
 313        if (run_command(&rsync))
 314                return error("Could not push objects to %s",
 315                                rsync_url(transport->url));
 316
 317        /* copy the refs to the temporary directory; they could be packed. */
 318
 319        strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 320        if (!mkdtemp(temp_dir.buf))
 321                die_errno ("Could not make temporary directory");
 322        strbuf_addch(&temp_dir, '/');
 323
 324        if (flags & TRANSPORT_PUSH_ALL) {
 325                if (for_each_ref(write_one_ref, &temp_dir))
 326                        return -1;
 327        } else if (write_refs_to_temp_dir(&temp_dir, refspec_nr, refspec))
 328                return -1;
 329
 330        i = 2;
 331        if (flags & TRANSPORT_PUSH_DRY_RUN)
 332                args[i++] = "--dry-run";
 333        if (!(flags & TRANSPORT_PUSH_FORCE))
 334                args[i++] = "--ignore-existing";
 335        args[i++] = temp_dir.buf;
 336        args[i++] = rsync_url(transport->url);
 337        args[i++] = NULL;
 338        if (run_command(&rsync))
 339                result = error("Could not push to %s",
 340                                rsync_url(transport->url));
 341
 342        if (remove_dir_recursively(&temp_dir, 0))
 343                warning ("Could not remove temporary directory %s.",
 344                                temp_dir.buf);
 345
 346        strbuf_release(&buf);
 347        strbuf_release(&temp_dir);
 348
 349        return result;
 350}
 351
 352struct bundle_transport_data {
 353        int fd;
 354        struct bundle_header header;
 355};
 356
 357static struct ref *get_refs_from_bundle(struct transport *transport, int for_push)
 358{
 359        struct bundle_transport_data *data = transport->data;
 360        struct ref *result = NULL;
 361        int i;
 362
 363        if (for_push)
 364                return NULL;
 365
 366        if (data->fd > 0)
 367                close(data->fd);
 368        data->fd = read_bundle_header(transport->url, &data->header);
 369        if (data->fd < 0)
 370                die ("Could not read bundle '%s'.", transport->url);
 371        for (i = 0; i < data->header.references.nr; i++) {
 372                struct ref_list_entry *e = data->header.references.list + i;
 373                struct ref *ref = alloc_ref(e->name);
 374                hashcpy(ref->old_sha1, e->sha1);
 375                ref->next = result;
 376                result = ref;
 377        }
 378        return result;
 379}
 380
 381static int fetch_refs_from_bundle(struct transport *transport,
 382                               int nr_heads, const struct ref **to_fetch)
 383{
 384        struct bundle_transport_data *data = transport->data;
 385        return unbundle(&data->header, data->fd);
 386}
 387
 388static int close_bundle(struct transport *transport)
 389{
 390        struct bundle_transport_data *data = transport->data;
 391        if (data->fd > 0)
 392                close(data->fd);
 393        free(data);
 394        return 0;
 395}
 396
 397struct git_transport_data {
 398        unsigned thin : 1;
 399        unsigned keep : 1;
 400        unsigned followtags : 1;
 401        int depth;
 402        struct child_process *conn;
 403        int fd[2];
 404        const char *uploadpack;
 405        const char *receivepack;
 406        struct extra_have_objects extra_have;
 407};
 408
 409static int set_git_option(struct transport *connection,
 410                          const char *name, const char *value)
 411{
 412        struct git_transport_data *data = connection->data;
 413        if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 414                data->uploadpack = value;
 415                return 0;
 416        } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 417                data->receivepack = value;
 418                return 0;
 419        } else if (!strcmp(name, TRANS_OPT_THIN)) {
 420                data->thin = !!value;
 421                return 0;
 422        } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
 423                data->followtags = !!value;
 424                return 0;
 425        } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 426                data->keep = !!value;
 427                return 0;
 428        } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 429                if (!value)
 430                        data->depth = 0;
 431                else
 432                        data->depth = atoi(value);
 433                return 0;
 434        }
 435        return 1;
 436}
 437
 438static int connect_setup(struct transport *transport, int for_push, int verbose)
 439{
 440        struct git_transport_data *data = transport->data;
 441        data->conn = git_connect(data->fd, transport->url,
 442                                 for_push ? data->receivepack : data->uploadpack,
 443                                 verbose ? CONNECT_VERBOSE : 0);
 444        return 0;
 445}
 446
 447static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
 448{
 449        struct git_transport_data *data = transport->data;
 450        struct ref *refs;
 451
 452        connect_setup(transport, for_push, 0);
 453        get_remote_heads(data->fd[0], &refs, 0, NULL,
 454                         for_push ? REF_NORMAL : 0, &data->extra_have);
 455
 456        return refs;
 457}
 458
 459static int fetch_refs_via_pack(struct transport *transport,
 460                               int nr_heads, const struct ref **to_fetch)
 461{
 462        struct git_transport_data *data = transport->data;
 463        char **heads = xmalloc(nr_heads * sizeof(*heads));
 464        char **origh = xmalloc(nr_heads * sizeof(*origh));
 465        const struct ref *refs;
 466        char *dest = xstrdup(transport->url);
 467        struct fetch_pack_args args;
 468        int i;
 469        struct ref *refs_tmp = NULL;
 470
 471        memset(&args, 0, sizeof(args));
 472        args.uploadpack = data->uploadpack;
 473        args.keep_pack = data->keep;
 474        args.lock_pack = 1;
 475        args.use_thin_pack = data->thin;
 476        args.include_tag = data->followtags;
 477        args.verbose = (transport->verbose > 0);
 478        args.quiet = (transport->verbose < 0);
 479        args.no_progress = args.quiet || (!transport->progress && !isatty(1));
 480        args.depth = data->depth;
 481
 482        for (i = 0; i < nr_heads; i++)
 483                origh[i] = heads[i] = xstrdup(to_fetch[i]->name);
 484
 485        if (!data->conn) {
 486                connect_setup(transport, 0, 0);
 487                get_remote_heads(data->fd[0], &refs_tmp, 0, NULL, 0, NULL);
 488        }
 489
 490        refs = fetch_pack(&args, data->fd, data->conn,
 491                          refs_tmp ? refs_tmp : transport->remote_refs,
 492                          dest, nr_heads, heads, &transport->pack_lockfile);
 493        close(data->fd[0]);
 494        close(data->fd[1]);
 495        if (finish_connect(data->conn))
 496                refs = NULL;
 497        data->conn = NULL;
 498
 499        free_refs(refs_tmp);
 500
 501        for (i = 0; i < nr_heads; i++)
 502                free(origh[i]);
 503        free(origh);
 504        free(heads);
 505        free(dest);
 506        return (refs ? 0 : -1);
 507}
 508
 509static int push_had_errors(struct ref *ref)
 510{
 511        for (; ref; ref = ref->next) {
 512                switch (ref->status) {
 513                case REF_STATUS_NONE:
 514                case REF_STATUS_UPTODATE:
 515                case REF_STATUS_OK:
 516                        break;
 517                default:
 518                        return 1;
 519                }
 520        }
 521        return 0;
 522}
 523
 524static int refs_pushed(struct ref *ref)
 525{
 526        for (; ref; ref = ref->next) {
 527                switch(ref->status) {
 528                case REF_STATUS_NONE:
 529                case REF_STATUS_UPTODATE:
 530                        break;
 531                default:
 532                        return 1;
 533                }
 534        }
 535        return 0;
 536}
 537
 538static void update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 539{
 540        struct refspec rs;
 541
 542        if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 543                return;
 544
 545        rs.src = ref->name;
 546        rs.dst = NULL;
 547
 548        if (!remote_find_tracking(remote, &rs)) {
 549                if (verbose)
 550                        fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 551                if (ref->deletion) {
 552                        delete_ref(rs.dst, NULL, 0);
 553                } else
 554                        update_ref("update by push", rs.dst,
 555                                        ref->new_sha1, NULL, 0, 0);
 556                free(rs.dst);
 557        }
 558}
 559
 560#define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)
 561
 562static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg, int porcelain)
 563{
 564        if (porcelain) {
 565                if (from)
 566                        fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 567                else
 568                        fprintf(stdout, "%c\t:%s\t", flag, to->name);
 569                if (msg)
 570                        fprintf(stdout, "%s (%s)\n", summary, msg);
 571                else
 572                        fprintf(stdout, "%s\n", summary);
 573        } else {
 574                fprintf(stderr, " %c %-*s ", flag, SUMMARY_WIDTH, summary);
 575                if (from)
 576                        fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 577                else
 578                        fputs(prettify_refname(to->name), stderr);
 579                if (msg) {
 580                        fputs(" (", stderr);
 581                        fputs(msg, stderr);
 582                        fputc(')', stderr);
 583                }
 584                fputc('\n', stderr);
 585        }
 586}
 587
 588static const char *status_abbrev(unsigned char sha1[20])
 589{
 590        return find_unique_abbrev(sha1, DEFAULT_ABBREV);
 591}
 592
 593static void print_ok_ref_status(struct ref *ref, int porcelain)
 594{
 595        if (ref->deletion)
 596                print_ref_status('-', "[deleted]", ref, NULL, NULL, porcelain);
 597        else if (is_null_sha1(ref->old_sha1))
 598                print_ref_status('*',
 599                        (!prefixcmp(ref->name, "refs/tags/") ? "[new tag]" :
 600                        "[new branch]"),
 601                        ref, ref->peer_ref, NULL, porcelain);
 602        else {
 603                char quickref[84];
 604                char type;
 605                const char *msg;
 606
 607                strcpy(quickref, status_abbrev(ref->old_sha1));
 608                if (ref->nonfastforward) {
 609                        strcat(quickref, "...");
 610                        type = '+';
 611                        msg = "forced update";
 612                } else {
 613                        strcat(quickref, "..");
 614                        type = ' ';
 615                        msg = NULL;
 616                }
 617                strcat(quickref, status_abbrev(ref->new_sha1));
 618
 619                print_ref_status(type, quickref, ref, ref->peer_ref, msg, porcelain);
 620        }
 621}
 622
 623static int print_one_push_status(struct ref *ref, const char *dest, int count, int porcelain)
 624{
 625        if (!count)
 626                fprintf(stderr, "To %s\n", dest);
 627
 628        switch(ref->status) {
 629        case REF_STATUS_NONE:
 630                print_ref_status('X', "[no match]", ref, NULL, NULL, porcelain);
 631                break;
 632        case REF_STATUS_REJECT_NODELETE:
 633                print_ref_status('!', "[rejected]", ref, NULL,
 634                                                 "remote does not support deleting refs", porcelain);
 635                break;
 636        case REF_STATUS_UPTODATE:
 637                print_ref_status('=', "[up to date]", ref,
 638                                                 ref->peer_ref, NULL, porcelain);
 639                break;
 640        case REF_STATUS_REJECT_NONFASTFORWARD:
 641                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 642                                                 "non-fast-forward", porcelain);
 643                break;
 644        case REF_STATUS_REMOTE_REJECT:
 645                print_ref_status('!', "[remote rejected]", ref,
 646                                                 ref->deletion ? NULL : ref->peer_ref,
 647                                                 ref->remote_status, porcelain);
 648                break;
 649        case REF_STATUS_EXPECTING_REPORT:
 650                print_ref_status('!', "[remote failure]", ref,
 651                                                 ref->deletion ? NULL : ref->peer_ref,
 652                                                 "remote failed to report status", porcelain);
 653                break;
 654        case REF_STATUS_OK:
 655                print_ok_ref_status(ref, porcelain);
 656                break;
 657        }
 658
 659        return 1;
 660}
 661
 662static void print_push_status(const char *dest, struct ref *refs,
 663                              int verbose, int porcelain, int * nonfastforward)
 664{
 665        struct ref *ref;
 666        int n = 0;
 667
 668        if (verbose) {
 669                for (ref = refs; ref; ref = ref->next)
 670                        if (ref->status == REF_STATUS_UPTODATE)
 671                                n += print_one_push_status(ref, dest, n, porcelain);
 672        }
 673
 674        for (ref = refs; ref; ref = ref->next)
 675                if (ref->status == REF_STATUS_OK)
 676                        n += print_one_push_status(ref, dest, n, porcelain);
 677
 678        *nonfastforward = 0;
 679        for (ref = refs; ref; ref = ref->next) {
 680                if (ref->status != REF_STATUS_NONE &&
 681                    ref->status != REF_STATUS_UPTODATE &&
 682                    ref->status != REF_STATUS_OK)
 683                        n += print_one_push_status(ref, dest, n, porcelain);
 684                if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD)
 685                        *nonfastforward = 1;
 686        }
 687}
 688
 689static void verify_remote_names(int nr_heads, const char **heads)
 690{
 691        int i;
 692
 693        for (i = 0; i < nr_heads; i++) {
 694                const char *local = heads[i];
 695                const char *remote = strrchr(heads[i], ':');
 696
 697                if (*local == '+')
 698                        local++;
 699
 700                /* A matching refspec is okay.  */
 701                if (remote == local && remote[1] == '\0')
 702                        continue;
 703
 704                remote = remote ? (remote + 1) : local;
 705                switch (check_ref_format(remote)) {
 706                case 0: /* ok */
 707                case CHECK_REF_FORMAT_ONELEVEL:
 708                        /* ok but a single level -- that is fine for
 709                         * a match pattern.
 710                         */
 711                case CHECK_REF_FORMAT_WILDCARD:
 712                        /* ok but ends with a pattern-match character */
 713                        continue;
 714                }
 715                die("remote part of refspec is not a valid name in %s",
 716                    heads[i]);
 717        }
 718}
 719
 720static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 721{
 722        struct git_transport_data *data = transport->data;
 723        struct send_pack_args args;
 724        int ret;
 725
 726        if (!data->conn) {
 727                struct ref *tmp_refs;
 728                connect_setup(transport, 1, 0);
 729
 730                get_remote_heads(data->fd[0], &tmp_refs, 0, NULL, REF_NORMAL,
 731                                 NULL);
 732        }
 733
 734        memset(&args, 0, sizeof(args));
 735        args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 736        args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 737        args.use_thin_pack = data->thin;
 738        args.verbose = !!(flags & TRANSPORT_PUSH_VERBOSE);
 739        args.quiet = !!(flags & TRANSPORT_PUSH_QUIET);
 740        args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 741
 742        ret = send_pack(&args, data->fd, data->conn, remote_refs,
 743                        &data->extra_have);
 744
 745        close(data->fd[1]);
 746        close(data->fd[0]);
 747        ret |= finish_connect(data->conn);
 748        data->conn = NULL;
 749
 750        return ret;
 751}
 752
 753static int disconnect_git(struct transport *transport)
 754{
 755        struct git_transport_data *data = transport->data;
 756        if (data->conn) {
 757                packet_flush(data->fd[1]);
 758                close(data->fd[0]);
 759                close(data->fd[1]);
 760                finish_connect(data->conn);
 761        }
 762
 763        free(data);
 764        return 0;
 765}
 766
 767static int is_local(const char *url)
 768{
 769        const char *colon = strchr(url, ':');
 770        const char *slash = strchr(url, '/');
 771        return !colon || (slash && slash < colon) ||
 772                has_dos_drive_prefix(url);
 773}
 774
 775static int is_file(const char *url)
 776{
 777        struct stat buf;
 778        if (stat(url, &buf))
 779                return 0;
 780        return S_ISREG(buf.st_mode);
 781}
 782
 783struct transport *transport_get(struct remote *remote, const char *url)
 784{
 785        struct transport *ret = xcalloc(1, sizeof(*ret));
 786
 787        if (!remote)
 788                die("No remote provided to transport_get()");
 789
 790        ret->remote = remote;
 791        ret->url = url;
 792
 793        if (!prefixcmp(url, "rsync:")) {
 794                ret->get_refs_list = get_refs_via_rsync;
 795                ret->fetch = fetch_objs_via_rsync;
 796                ret->push = rsync_transport_push;
 797
 798        } else if (!prefixcmp(url, "http://")
 799                || !prefixcmp(url, "https://")
 800                || !prefixcmp(url, "ftp://")) {
 801                transport_helper_init(ret, "curl");
 802#ifdef NO_CURL
 803                error("git was compiled without libcurl support.");
 804#endif
 805
 806        } else if (is_local(url) && is_file(url)) {
 807                struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 808                ret->data = data;
 809                ret->get_refs_list = get_refs_from_bundle;
 810                ret->fetch = fetch_refs_from_bundle;
 811                ret->disconnect = close_bundle;
 812
 813        } else {
 814                struct git_transport_data *data = xcalloc(1, sizeof(*data));
 815                ret->data = data;
 816                ret->set_option = set_git_option;
 817                ret->get_refs_list = get_refs_via_connect;
 818                ret->fetch = fetch_refs_via_pack;
 819                ret->push_refs = git_transport_push;
 820                ret->disconnect = disconnect_git;
 821
 822                data->thin = 1;
 823                data->conn = NULL;
 824                data->uploadpack = "git-upload-pack";
 825                if (remote->uploadpack)
 826                        data->uploadpack = remote->uploadpack;
 827                data->receivepack = "git-receive-pack";
 828                if (remote->receivepack)
 829                        data->receivepack = remote->receivepack;
 830        }
 831
 832        return ret;
 833}
 834
 835int transport_set_option(struct transport *transport,
 836                         const char *name, const char *value)
 837{
 838        if (transport->set_option)
 839                return transport->set_option(transport, name, value);
 840        return 1;
 841}
 842
 843int transport_push(struct transport *transport,
 844                   int refspec_nr, const char **refspec, int flags,
 845                   int *nonfastforward)
 846{
 847        *nonfastforward = 0;
 848        verify_remote_names(refspec_nr, refspec);
 849
 850        if (transport->push)
 851                return transport->push(transport, refspec_nr, refspec, flags);
 852        if (transport->push_refs) {
 853                struct ref *remote_refs =
 854                        transport->get_refs_list(transport, 1);
 855                struct ref *local_refs = get_local_heads();
 856                int match_flags = MATCH_REFS_NONE;
 857                int verbose = flags & TRANSPORT_PUSH_VERBOSE;
 858                int quiet = flags & TRANSPORT_PUSH_QUIET;
 859                int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
 860                int ret;
 861
 862                if (flags & TRANSPORT_PUSH_ALL)
 863                        match_flags |= MATCH_REFS_ALL;
 864                if (flags & TRANSPORT_PUSH_MIRROR)
 865                        match_flags |= MATCH_REFS_MIRROR;
 866
 867                if (match_refs(local_refs, &remote_refs,
 868                               refspec_nr, refspec, match_flags)) {
 869                        return -1;
 870                }
 871
 872                ret = transport->push_refs(transport, remote_refs, flags);
 873
 874                if (!quiet || push_had_errors(remote_refs))
 875                        print_push_status(transport->url, remote_refs,
 876                                        verbose | porcelain, porcelain,
 877                                        nonfastforward);
 878
 879                if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
 880                        struct ref *ref;
 881                        for (ref = remote_refs; ref; ref = ref->next)
 882                                update_tracking_ref(transport->remote, ref, verbose);
 883                }
 884
 885                if (!quiet && !ret && !refs_pushed(remote_refs))
 886                        fprintf(stderr, "Everything up-to-date\n");
 887                return ret;
 888        }
 889        return 1;
 890}
 891
 892const struct ref *transport_get_remote_refs(struct transport *transport)
 893{
 894        if (!transport->remote_refs)
 895                transport->remote_refs = transport->get_refs_list(transport, 0);
 896        return transport->remote_refs;
 897}
 898
 899int transport_fetch_refs(struct transport *transport, const struct ref *refs)
 900{
 901        int rc;
 902        int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
 903        const struct ref **heads = NULL;
 904        const struct ref *rm;
 905
 906        for (rm = refs; rm; rm = rm->next) {
 907                nr_refs++;
 908                if (rm->peer_ref &&
 909                    !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
 910                        continue;
 911                ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
 912                heads[nr_heads++] = rm;
 913        }
 914
 915        if (!nr_heads) {
 916                /*
 917                 * When deepening of a shallow repository is requested,
 918                 * then local and remote refs are likely to still be equal.
 919                 * Just feed them all to the fetch method in that case.
 920                 * This condition shouldn't be met in a non-deepening fetch
 921                 * (see builtin-fetch.c:quickfetch()).
 922                 */
 923                heads = xmalloc(nr_refs * sizeof(*heads));
 924                for (rm = refs; rm; rm = rm->next)
 925                        heads[nr_heads++] = rm;
 926        }
 927
 928        rc = transport->fetch(transport, nr_heads, heads);
 929        free(heads);
 930        return rc;
 931}
 932
 933void transport_unlock_pack(struct transport *transport)
 934{
 935        if (transport->pack_lockfile) {
 936                unlink_or_warn(transport->pack_lockfile);
 937                free(transport->pack_lockfile);
 938                transport->pack_lockfile = NULL;
 939        }
 940}
 941
 942int transport_disconnect(struct transport *transport)
 943{
 944        int ret = 0;
 945        if (transport->disconnect)
 946                ret = transport->disconnect(transport);
 947        free(transport);
 948        return ret;
 949}
 950
 951/*
 952 * Strip username (and password) from an url and return
 953 * it in a newly allocated string.
 954 */
 955char *transport_anonymize_url(const char *url)
 956{
 957        char *anon_url, *scheme_prefix, *anon_part;
 958        size_t anon_len, prefix_len = 0;
 959
 960        anon_part = strchr(url, '@');
 961        if (is_local(url) || !anon_part)
 962                goto literal_copy;
 963
 964        anon_len = strlen(++anon_part);
 965        scheme_prefix = strstr(url, "://");
 966        if (!scheme_prefix) {
 967                if (!strchr(anon_part, ':'))
 968                        /* cannot be "me@there:/path/name" */
 969                        goto literal_copy;
 970        } else {
 971                const char *cp;
 972                /* make sure scheme is reasonable */
 973                for (cp = url; cp < scheme_prefix; cp++) {
 974                        switch (*cp) {
 975                                /* RFC 1738 2.1 */
 976                        case '+': case '.': case '-':
 977                                break; /* ok */
 978                        default:
 979                                if (isalnum(*cp))
 980                                        break;
 981                                /* it isn't */
 982                                goto literal_copy;
 983                        }
 984                }
 985                /* @ past the first slash does not count */
 986                cp = strchr(scheme_prefix + 3, '/');
 987                if (cp && cp < anon_part)
 988                        goto literal_copy;
 989                prefix_len = scheme_prefix - url + 3;
 990        }
 991        anon_url = xcalloc(1, 1 + prefix_len + anon_len);
 992        memcpy(anon_url, url, prefix_len);
 993        memcpy(anon_url + prefix_len, anon_part, anon_len);
 994        return anon_url;
 995literal_copy:
 996        return xstrdup(url);
 997}