Andrew's git / gitweb.git / transport.c
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transport.con commit rev-parse --branches/--tags/--remotes=pattern (b09fe97)
   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, 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, 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        struct git_transport_options options;
 399        struct child_process *conn;
 400        int fd[2];
 401        unsigned got_remote_heads : 1;
 402        struct extra_have_objects extra_have;
 403};
 404
 405static int set_git_option(struct git_transport_options *opts,
 406                          const char *name, const char *value)
 407{
 408        if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 409                opts->uploadpack = value;
 410                return 0;
 411        } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 412                opts->receivepack = value;
 413                return 0;
 414        } else if (!strcmp(name, TRANS_OPT_THIN)) {
 415                opts->thin = !!value;
 416                return 0;
 417        } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
 418                opts->followtags = !!value;
 419                return 0;
 420        } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 421                opts->keep = !!value;
 422                return 0;
 423        } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 424                if (!value)
 425                        opts->depth = 0;
 426                else
 427                        opts->depth = atoi(value);
 428                return 0;
 429        }
 430        return 1;
 431}
 432
 433static int connect_setup(struct transport *transport, int for_push, int verbose)
 434{
 435        struct git_transport_data *data = transport->data;
 436
 437        if (data->conn)
 438                return 0;
 439
 440        data->conn = git_connect(data->fd, transport->url,
 441                                 for_push ? data->options.receivepack :
 442                                 data->options.uploadpack,
 443                                 verbose ? CONNECT_VERBOSE : 0);
 444
 445        return 0;
 446}
 447
 448static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
 449{
 450        struct git_transport_data *data = transport->data;
 451        struct ref *refs;
 452
 453        connect_setup(transport, for_push, 0);
 454        get_remote_heads(data->fd[0], &refs, 0, NULL,
 455                         for_push ? REF_NORMAL : 0, &data->extra_have);
 456        data->got_remote_heads = 1;
 457
 458        return refs;
 459}
 460
 461static int fetch_refs_via_pack(struct transport *transport,
 462                               int nr_heads, struct ref **to_fetch)
 463{
 464        struct git_transport_data *data = transport->data;
 465        char **heads = xmalloc(nr_heads * sizeof(*heads));
 466        char **origh = xmalloc(nr_heads * sizeof(*origh));
 467        const struct ref *refs;
 468        char *dest = xstrdup(transport->url);
 469        struct fetch_pack_args args;
 470        int i;
 471        struct ref *refs_tmp = NULL;
 472
 473        memset(&args, 0, sizeof(args));
 474        args.uploadpack = data->options.uploadpack;
 475        args.keep_pack = data->options.keep;
 476        args.lock_pack = 1;
 477        args.use_thin_pack = data->options.thin;
 478        args.include_tag = data->options.followtags;
 479        args.verbose = (transport->verbose > 0);
 480        args.quiet = (transport->verbose < 0);
 481        args.no_progress = args.quiet || (!transport->progress && !isatty(2));
 482        args.depth = data->options.depth;
 483
 484        for (i = 0; i < nr_heads; i++)
 485                origh[i] = heads[i] = xstrdup(to_fetch[i]->name);
 486
 487        if (!data->got_remote_heads) {
 488                connect_setup(transport, 0, 0);
 489                get_remote_heads(data->fd[0], &refs_tmp, 0, NULL, 0, NULL);
 490                data->got_remote_heads = 1;
 491        }
 492
 493        refs = fetch_pack(&args, data->fd, data->conn,
 494                          refs_tmp ? refs_tmp : transport->remote_refs,
 495                          dest, nr_heads, heads, &transport->pack_lockfile);
 496        close(data->fd[0]);
 497        close(data->fd[1]);
 498        if (finish_connect(data->conn))
 499                refs = NULL;
 500        data->conn = NULL;
 501        data->got_remote_heads = 0;
 502
 503        free_refs(refs_tmp);
 504
 505        for (i = 0; i < nr_heads; i++)
 506                free(origh[i]);
 507        free(origh);
 508        free(heads);
 509        free(dest);
 510        return (refs ? 0 : -1);
 511}
 512
 513static int push_had_errors(struct ref *ref)
 514{
 515        for (; ref; ref = ref->next) {
 516                switch (ref->status) {
 517                case REF_STATUS_NONE:
 518                case REF_STATUS_UPTODATE:
 519                case REF_STATUS_OK:
 520                        break;
 521                default:
 522                        return 1;
 523                }
 524        }
 525        return 0;
 526}
 527
 528static int refs_pushed(struct ref *ref)
 529{
 530        for (; ref; ref = ref->next) {
 531                switch(ref->status) {
 532                case REF_STATUS_NONE:
 533                case REF_STATUS_UPTODATE:
 534                        break;
 535                default:
 536                        return 1;
 537                }
 538        }
 539        return 0;
 540}
 541
 542static void update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 543{
 544        struct refspec rs;
 545
 546        if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 547                return;
 548
 549        rs.src = ref->name;
 550        rs.dst = NULL;
 551
 552        if (!remote_find_tracking(remote, &rs)) {
 553                if (verbose)
 554                        fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 555                if (ref->deletion) {
 556                        delete_ref(rs.dst, NULL, 0);
 557                } else
 558                        update_ref("update by push", rs.dst,
 559                                        ref->new_sha1, NULL, 0, 0);
 560                free(rs.dst);
 561        }
 562}
 563
 564#define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)
 565
 566static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg, int porcelain)
 567{
 568        if (porcelain) {
 569                if (from)
 570                        fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 571                else
 572                        fprintf(stdout, "%c\t:%s\t", flag, to->name);
 573                if (msg)
 574                        fprintf(stdout, "%s (%s)\n", summary, msg);
 575                else
 576                        fprintf(stdout, "%s\n", summary);
 577        } else {
 578                fprintf(stderr, " %c %-*s ", flag, SUMMARY_WIDTH, summary);
 579                if (from)
 580                        fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 581                else
 582                        fputs(prettify_refname(to->name), stderr);
 583                if (msg) {
 584                        fputs(" (", stderr);
 585                        fputs(msg, stderr);
 586                        fputc(')', stderr);
 587                }
 588                fputc('\n', stderr);
 589        }
 590}
 591
 592static const char *status_abbrev(unsigned char sha1[20])
 593{
 594        return find_unique_abbrev(sha1, DEFAULT_ABBREV);
 595}
 596
 597static void print_ok_ref_status(struct ref *ref, int porcelain)
 598{
 599        if (ref->deletion)
 600                print_ref_status('-', "[deleted]", ref, NULL, NULL, porcelain);
 601        else if (is_null_sha1(ref->old_sha1))
 602                print_ref_status('*',
 603                        (!prefixcmp(ref->name, "refs/tags/") ? "[new tag]" :
 604                        "[new branch]"),
 605                        ref, ref->peer_ref, NULL, porcelain);
 606        else {
 607                char quickref[84];
 608                char type;
 609                const char *msg;
 610
 611                strcpy(quickref, status_abbrev(ref->old_sha1));
 612                if (ref->nonfastforward) {
 613                        strcat(quickref, "...");
 614                        type = '+';
 615                        msg = "forced update";
 616                } else {
 617                        strcat(quickref, "..");
 618                        type = ' ';
 619                        msg = NULL;
 620                }
 621                strcat(quickref, status_abbrev(ref->new_sha1));
 622
 623                print_ref_status(type, quickref, ref, ref->peer_ref, msg, porcelain);
 624        }
 625}
 626
 627static int print_one_push_status(struct ref *ref, const char *dest, int count, int porcelain)
 628{
 629        if (!count)
 630                fprintf(stderr, "To %s\n", dest);
 631
 632        switch(ref->status) {
 633        case REF_STATUS_NONE:
 634                print_ref_status('X', "[no match]", ref, NULL, NULL, porcelain);
 635                break;
 636        case REF_STATUS_REJECT_NODELETE:
 637                print_ref_status('!', "[rejected]", ref, NULL,
 638                                                 "remote does not support deleting refs", porcelain);
 639                break;
 640        case REF_STATUS_UPTODATE:
 641                print_ref_status('=', "[up to date]", ref,
 642                                                 ref->peer_ref, NULL, porcelain);
 643                break;
 644        case REF_STATUS_REJECT_NONFASTFORWARD:
 645                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 646                                                 "non-fast-forward", porcelain);
 647                break;
 648        case REF_STATUS_REMOTE_REJECT:
 649                print_ref_status('!', "[remote rejected]", ref,
 650                                                 ref->deletion ? NULL : ref->peer_ref,
 651                                                 ref->remote_status, porcelain);
 652                break;
 653        case REF_STATUS_EXPECTING_REPORT:
 654                print_ref_status('!', "[remote failure]", ref,
 655                                                 ref->deletion ? NULL : ref->peer_ref,
 656                                                 "remote failed to report status", porcelain);
 657                break;
 658        case REF_STATUS_OK:
 659                print_ok_ref_status(ref, porcelain);
 660                break;
 661        }
 662
 663        return 1;
 664}
 665
 666static void print_push_status(const char *dest, struct ref *refs,
 667                              int verbose, int porcelain, int * nonfastforward)
 668{
 669        struct ref *ref;
 670        int n = 0;
 671
 672        if (verbose) {
 673                for (ref = refs; ref; ref = ref->next)
 674                        if (ref->status == REF_STATUS_UPTODATE)
 675                                n += print_one_push_status(ref, dest, n, porcelain);
 676        }
 677
 678        for (ref = refs; ref; ref = ref->next)
 679                if (ref->status == REF_STATUS_OK)
 680                        n += print_one_push_status(ref, dest, n, porcelain);
 681
 682        *nonfastforward = 0;
 683        for (ref = refs; ref; ref = ref->next) {
 684                if (ref->status != REF_STATUS_NONE &&
 685                    ref->status != REF_STATUS_UPTODATE &&
 686                    ref->status != REF_STATUS_OK)
 687                        n += print_one_push_status(ref, dest, n, porcelain);
 688                if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD)
 689                        *nonfastforward = 1;
 690        }
 691}
 692
 693static void verify_remote_names(int nr_heads, const char **heads)
 694{
 695        int i;
 696
 697        for (i = 0; i < nr_heads; i++) {
 698                const char *local = heads[i];
 699                const char *remote = strrchr(heads[i], ':');
 700
 701                if (*local == '+')
 702                        local++;
 703
 704                /* A matching refspec is okay.  */
 705                if (remote == local && remote[1] == '\0')
 706                        continue;
 707
 708                remote = remote ? (remote + 1) : local;
 709                switch (check_ref_format(remote)) {
 710                case 0: /* ok */
 711                case CHECK_REF_FORMAT_ONELEVEL:
 712                        /* ok but a single level -- that is fine for
 713                         * a match pattern.
 714                         */
 715                case CHECK_REF_FORMAT_WILDCARD:
 716                        /* ok but ends with a pattern-match character */
 717                        continue;
 718                }
 719                die("remote part of refspec is not a valid name in %s",
 720                    heads[i]);
 721        }
 722}
 723
 724static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 725{
 726        struct git_transport_data *data = transport->data;
 727        struct send_pack_args args;
 728        int ret;
 729
 730        if (!data->got_remote_heads) {
 731                struct ref *tmp_refs;
 732                connect_setup(transport, 1, 0);
 733
 734                get_remote_heads(data->fd[0], &tmp_refs, 0, NULL, REF_NORMAL,
 735                                 NULL);
 736                data->got_remote_heads = 1;
 737        }
 738
 739        memset(&args, 0, sizeof(args));
 740        args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 741        args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 742        args.use_thin_pack = data->options.thin;
 743        args.verbose = !!(flags & TRANSPORT_PUSH_VERBOSE);
 744        args.quiet = !!(flags & TRANSPORT_PUSH_QUIET);
 745        args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 746
 747        ret = send_pack(&args, data->fd, data->conn, remote_refs,
 748                        &data->extra_have);
 749
 750        close(data->fd[1]);
 751        close(data->fd[0]);
 752        ret |= finish_connect(data->conn);
 753        data->conn = NULL;
 754        data->got_remote_heads = 0;
 755
 756        return ret;
 757}
 758
 759static int connect_git(struct transport *transport, const char *name,
 760                       const char *executable, int fd[2])
 761{
 762        struct git_transport_data *data = transport->data;
 763        data->conn = git_connect(data->fd, transport->url,
 764                                 executable, 0);
 765        fd[0] = data->fd[0];
 766        fd[1] = data->fd[1];
 767        return 0;
 768}
 769
 770static int disconnect_git(struct transport *transport)
 771{
 772        struct git_transport_data *data = transport->data;
 773        if (data->conn) {
 774                if (data->got_remote_heads)
 775                        packet_flush(data->fd[1]);
 776                close(data->fd[0]);
 777                close(data->fd[1]);
 778                finish_connect(data->conn);
 779        }
 780
 781        free(data);
 782        return 0;
 783}
 784
 785void transport_take_over(struct transport *transport,
 786                         struct child_process *child)
 787{
 788        struct git_transport_data *data;
 789
 790        if (!transport->smart_options)
 791                die("Bug detected: Taking over transport requires non-NULL "
 792                    "smart_options field.");
 793
 794        data = xcalloc(1, sizeof(*data));
 795        data->options = *transport->smart_options;
 796        data->conn = child;
 797        data->fd[0] = data->conn->out;
 798        data->fd[1] = data->conn->in;
 799        data->got_remote_heads = 0;
 800        transport->data = data;
 801
 802        transport->set_option = NULL;
 803        transport->get_refs_list = get_refs_via_connect;
 804        transport->fetch = fetch_refs_via_pack;
 805        transport->push = NULL;
 806        transport->push_refs = git_transport_push;
 807        transport->disconnect = disconnect_git;
 808        transport->smart_options = &(data->options);
 809}
 810
 811static int is_local(const char *url)
 812{
 813        const char *colon = strchr(url, ':');
 814        const char *slash = strchr(url, '/');
 815        return !colon || (slash && slash < colon) ||
 816                has_dos_drive_prefix(url);
 817}
 818
 819static int is_file(const char *url)
 820{
 821        struct stat buf;
 822        if (stat(url, &buf))
 823                return 0;
 824        return S_ISREG(buf.st_mode);
 825}
 826
 827static int is_url(const char *url)
 828{
 829        const char *url2, *first_slash;
 830
 831        if (!url)
 832                return 0;
 833        url2 = url;
 834        first_slash = strchr(url, '/');
 835
 836        /* Input with no slash at all or slash first can't be URL. */
 837        if (!first_slash || first_slash == url)
 838                return 0;
 839        /* Character before must be : and next must be /. */
 840        if (first_slash[-1] != ':' || first_slash[1] != '/')
 841                return 0;
 842        /* There must be something before the :// */
 843        if (first_slash == url + 1)
 844                return 0;
 845        /*
 846         * Check all characters up to first slash - 1. Only alphanum
 847         * is allowed.
 848         */
 849        url2 = url;
 850        while (url2 < first_slash - 1) {
 851                if (!isalnum((unsigned char)*url2))
 852                        return 0;
 853                url2++;
 854        }
 855
 856        /* Valid enough. */
 857        return 1;
 858}
 859
 860static int external_specification_len(const char *url)
 861{
 862        return strchr(url, ':') - url;
 863}
 864
 865struct transport *transport_get(struct remote *remote, const char *url)
 866{
 867        struct transport *ret = xcalloc(1, sizeof(*ret));
 868
 869        if (!remote)
 870                die("No remote provided to transport_get()");
 871
 872        ret->remote = remote;
 873
 874        if (!url && remote && remote->url)
 875                url = remote->url[0];
 876        ret->url = url;
 877
 878        /* In case previous URL had helper forced, reset it. */
 879        remote->foreign_vcs = NULL;
 880
 881        /* maybe it is a foreign URL? */
 882        if (url) {
 883                const char *p = url;
 884
 885                while (isalnum(*p))
 886                        p++;
 887                if (!prefixcmp(p, "::"))
 888                        remote->foreign_vcs = xstrndup(url, p - url);
 889        }
 890
 891        if (remote && remote->foreign_vcs) {
 892                transport_helper_init(ret, remote->foreign_vcs);
 893        } else if (!prefixcmp(url, "rsync:")) {
 894                ret->get_refs_list = get_refs_via_rsync;
 895                ret->fetch = fetch_objs_via_rsync;
 896                ret->push = rsync_transport_push;
 897                ret->smart_options = NULL;
 898        } else if (is_local(url) && is_file(url)) {
 899                struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 900                ret->data = data;
 901                ret->get_refs_list = get_refs_from_bundle;
 902                ret->fetch = fetch_refs_from_bundle;
 903                ret->disconnect = close_bundle;
 904                ret->smart_options = NULL;
 905        } else if (!is_url(url)
 906                || !prefixcmp(url, "file://")
 907                || !prefixcmp(url, "git://")
 908                || !prefixcmp(url, "ssh://")
 909                || !prefixcmp(url, "git+ssh://")
 910                || !prefixcmp(url, "ssh+git://")) {
 911                /* These are builtin smart transports. */
 912                struct git_transport_data *data = xcalloc(1, sizeof(*data));
 913                ret->data = data;
 914                ret->set_option = NULL;
 915                ret->get_refs_list = get_refs_via_connect;
 916                ret->fetch = fetch_refs_via_pack;
 917                ret->push_refs = git_transport_push;
 918                ret->connect = connect_git;
 919                ret->disconnect = disconnect_git;
 920                ret->smart_options = &(data->options);
 921
 922                data->conn = NULL;
 923                data->got_remote_heads = 0;
 924        } else {
 925                /* Unknown protocol in URL. Pass to external handler. */
 926                int len = external_specification_len(url);
 927                char *handler = xmalloc(len + 1);
 928                handler[len] = 0;
 929                strncpy(handler, url, len);
 930                transport_helper_init(ret, handler);
 931        }
 932
 933        if (ret->smart_options) {
 934                ret->smart_options->thin = 1;
 935                ret->smart_options->uploadpack = "git-upload-pack";
 936                if (remote->uploadpack)
 937                        ret->smart_options->uploadpack = remote->uploadpack;
 938                ret->smart_options->receivepack = "git-receive-pack";
 939                if (remote->receivepack)
 940                        ret->smart_options->receivepack = remote->receivepack;
 941        }
 942
 943        return ret;
 944}
 945
 946int transport_set_option(struct transport *transport,
 947                         const char *name, const char *value)
 948{
 949        int git_reports = 1, protocol_reports = 1;
 950
 951        if (transport->smart_options)
 952                git_reports = set_git_option(transport->smart_options,
 953                                             name, value);
 954
 955        if (transport->set_option)
 956                protocol_reports = transport->set_option(transport, name,
 957                                                        value);
 958
 959        /* If either report is 0, report 0 (success). */
 960        if (!git_reports || !protocol_reports)
 961                return 0;
 962        /* If either reports -1 (invalid value), report -1. */
 963        if ((git_reports == -1) || (protocol_reports == -1))
 964                return -1;
 965        /* Otherwise if both report unknown, report unknown. */
 966        return 1;
 967}
 968
 969int transport_push(struct transport *transport,
 970                   int refspec_nr, const char **refspec, int flags,
 971                   int *nonfastforward)
 972{
 973        *nonfastforward = 0;
 974        verify_remote_names(refspec_nr, refspec);
 975
 976        if (transport->push) {
 977                return transport->push(transport, refspec_nr, refspec, flags);
 978        } else if (transport->push_refs) {
 979                struct ref *remote_refs =
 980                        transport->get_refs_list(transport, 1);
 981                struct ref *local_refs = get_local_heads();
 982                int match_flags = MATCH_REFS_NONE;
 983                int verbose = flags & TRANSPORT_PUSH_VERBOSE;
 984                int quiet = flags & TRANSPORT_PUSH_QUIET;
 985                int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
 986                int ret;
 987
 988                if (flags & TRANSPORT_PUSH_ALL)
 989                        match_flags |= MATCH_REFS_ALL;
 990                if (flags & TRANSPORT_PUSH_MIRROR)
 991                        match_flags |= MATCH_REFS_MIRROR;
 992
 993                if (match_refs(local_refs, &remote_refs,
 994                               refspec_nr, refspec, match_flags)) {
 995                        return -1;
 996                }
 997
 998                ret = transport->push_refs(transport, remote_refs, flags);
 999
1000                if (!quiet || push_had_errors(remote_refs))
1001                        print_push_status(transport->url, remote_refs,
1002                                        verbose | porcelain, porcelain,
1003                                        nonfastforward);
1004
1005                if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
1006                        struct ref *ref;
1007                        for (ref = remote_refs; ref; ref = ref->next)
1008                                update_tracking_ref(transport->remote, ref, verbose);
1009                }
1010
1011                if (!quiet && !ret && !refs_pushed(remote_refs))
1012                        fprintf(stderr, "Everything up-to-date\n");
1013                return ret;
1014        }
1015        return 1;
1016}
1017
1018const struct ref *transport_get_remote_refs(struct transport *transport)
1019{
1020        if (!transport->remote_refs)
1021                transport->remote_refs = transport->get_refs_list(transport, 0);
1022
1023        return transport->remote_refs;
1024}
1025
1026int transport_fetch_refs(struct transport *transport, struct ref *refs)
1027{
1028        int rc;
1029        int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1030        struct ref **heads = NULL;
1031        struct ref *rm;
1032
1033        for (rm = refs; rm; rm = rm->next) {
1034                nr_refs++;
1035                if (rm->peer_ref &&
1036                    !is_null_sha1(rm->old_sha1) &&
1037                    !hashcmp(rm->peer_ref->old_sha1, rm->old_sha1))
1038                        continue;
1039                ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1040                heads[nr_heads++] = rm;
1041        }
1042
1043        if (!nr_heads) {
1044                /*
1045                 * When deepening of a shallow repository is requested,
1046                 * then local and remote refs are likely to still be equal.
1047                 * Just feed them all to the fetch method in that case.
1048                 * This condition shouldn't be met in a non-deepening fetch
1049                 * (see builtin-fetch.c:quickfetch()).
1050                 */
1051                heads = xmalloc(nr_refs * sizeof(*heads));
1052                for (rm = refs; rm; rm = rm->next)
1053                        heads[nr_heads++] = rm;
1054        }
1055
1056        rc = transport->fetch(transport, nr_heads, heads);
1057
1058        free(heads);
1059        return rc;
1060}
1061
1062void transport_unlock_pack(struct transport *transport)
1063{
1064        if (transport->pack_lockfile) {
1065                unlink_or_warn(transport->pack_lockfile);
1066                free(transport->pack_lockfile);
1067                transport->pack_lockfile = NULL;
1068        }
1069}
1070
1071int transport_connect(struct transport *transport, const char *name,
1072                      const char *exec, int fd[2])
1073{
1074        if (transport->connect)
1075                return transport->connect(transport, name, exec, fd);
1076        else
1077                die("Operation not supported by protocol");
1078}
1079
1080int transport_disconnect(struct transport *transport)
1081{
1082        int ret = 0;
1083        if (transport->disconnect)
1084                ret = transport->disconnect(transport);
1085        free(transport);
1086        return ret;
1087}
1088
1089/*
1090 * Strip username (and password) from an url and return
1091 * it in a newly allocated string.
1092 */
1093char *transport_anonymize_url(const char *url)
1094{
1095        char *anon_url, *scheme_prefix, *anon_part;
1096        size_t anon_len, prefix_len = 0;
1097
1098        anon_part = strchr(url, '@');
1099        if (is_local(url) || !anon_part)
1100                goto literal_copy;
1101
1102        anon_len = strlen(++anon_part);
1103        scheme_prefix = strstr(url, "://");
1104        if (!scheme_prefix) {
1105                if (!strchr(anon_part, ':'))
1106                        /* cannot be "me@there:/path/name" */
1107                        goto literal_copy;
1108        } else {
1109                const char *cp;
1110                /* make sure scheme is reasonable */
1111                for (cp = url; cp < scheme_prefix; cp++) {
1112                        switch (*cp) {
1113                                /* RFC 1738 2.1 */
1114                        case '+': case '.': case '-':
1115                                break; /* ok */
1116                        default:
1117                                if (isalnum(*cp))
1118                                        break;
1119                                /* it isn't */
1120                                goto literal_copy;
1121                        }
1122                }
1123                /* @ past the first slash does not count */
1124                cp = strchr(scheme_prefix + 3, '/');
1125                if (cp && cp < anon_part)
1126                        goto literal_copy;
1127                prefix_len = scheme_prefix - url + 3;
1128        }
1129        anon_url = xcalloc(1, 1 + prefix_len + anon_len);
1130        memcpy(anon_url, url, prefix_len);
1131        memcpy(anon_url + prefix_len, anon_part, anon_len);
1132        return anon_url;
1133literal_copy:
1134        return xstrdup(url);
1135}