163abedcb0fcbd4b8a769007914b512db3fb8dce
   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 "remote.h"
   7#include "connect.h"
   8#include "send-pack.h"
   9#include "walker.h"
  10#include "bundle.h"
  11#include "dir.h"
  12#include "refs.h"
  13#include "branch.h"
  14#include "url.h"
  15#include "submodule.h"
  16#include "string-list.h"
  17#include "sha1-array.h"
  18#include "sigchain.h"
  19
  20/* rsync support */
  21
  22/*
  23 * We copy packed-refs and refs/ into a temporary file, then read the
  24 * loose refs recursively (sorting whenever possible), and then inserting
  25 * those packed refs that are not yet in the list (not validating, but
  26 * assuming that the file is sorted).
  27 *
  28 * Appears refactoring this from refs.c is too cumbersome.
  29 */
  30
  31static int str_cmp(const void *a, const void *b)
  32{
  33        const char *s1 = a;
  34        const char *s2 = b;
  35
  36        return strcmp(s1, s2);
  37}
  38
  39/* path->buf + name_offset is expected to point to "refs/" */
  40
  41static int read_loose_refs(struct strbuf *path, int name_offset,
  42                struct ref **tail)
  43{
  44        DIR *dir = opendir(path->buf);
  45        struct dirent *de;
  46        struct {
  47                char **entries;
  48                int nr, alloc;
  49        } list;
  50        int i, pathlen;
  51
  52        if (!dir)
  53                return -1;
  54
  55        memset (&list, 0, sizeof(list));
  56
  57        while ((de = readdir(dir))) {
  58                if (is_dot_or_dotdot(de->d_name))
  59                        continue;
  60                ALLOC_GROW(list.entries, list.nr + 1, list.alloc);
  61                list.entries[list.nr++] = xstrdup(de->d_name);
  62        }
  63        closedir(dir);
  64
  65        /* sort the list */
  66
  67        qsort(list.entries, list.nr, sizeof(char *), str_cmp);
  68
  69        pathlen = path->len;
  70        strbuf_addch(path, '/');
  71
  72        for (i = 0; i < list.nr; i++, strbuf_setlen(path, pathlen + 1)) {
  73                strbuf_addstr(path, list.entries[i]);
  74                if (read_loose_refs(path, name_offset, tail)) {
  75                        int fd = open(path->buf, O_RDONLY);
  76                        char buffer[40];
  77                        struct ref *next;
  78
  79                        if (fd < 0)
  80                                continue;
  81                        next = alloc_ref(path->buf + name_offset);
  82                        if (read_in_full(fd, buffer, 40) != 40 ||
  83                                        get_oid_hex(buffer, &next->old_oid)) {
  84                                close(fd);
  85                                free(next);
  86                                continue;
  87                        }
  88                        close(fd);
  89                        (*tail)->next = next;
  90                        *tail = next;
  91                }
  92        }
  93        strbuf_setlen(path, pathlen);
  94
  95        for (i = 0; i < list.nr; i++)
  96                free(list.entries[i]);
  97        free(list.entries);
  98
  99        return 0;
 100}
 101
 102/* insert the packed refs for which no loose refs were found */
 103
 104static void insert_packed_refs(const char *packed_refs, struct ref **list)
 105{
 106        FILE *f = fopen(packed_refs, "r");
 107        static char buffer[PATH_MAX];
 108
 109        if (!f)
 110                return;
 111
 112        for (;;) {
 113                int cmp = 0; /* assigned before used */
 114                int len;
 115
 116                if (!fgets(buffer, sizeof(buffer), f)) {
 117                        fclose(f);
 118                        return;
 119                }
 120
 121                if (!isxdigit(buffer[0]))
 122                        continue;
 123                len = strlen(buffer);
 124                if (len && buffer[len - 1] == '\n')
 125                        buffer[--len] = '\0';
 126                if (len < 41)
 127                        continue;
 128                while ((*list)->next &&
 129                                (cmp = strcmp(buffer + 41,
 130                                      (*list)->next->name)) > 0)
 131                        list = &(*list)->next;
 132                if (!(*list)->next || cmp < 0) {
 133                        struct ref *next = alloc_ref(buffer + 41);
 134                        buffer[40] = '\0';
 135                        if (get_oid_hex(buffer, &next->old_oid)) {
 136                                warning ("invalid SHA-1: %s", buffer);
 137                                free(next);
 138                                continue;
 139                        }
 140                        next->next = (*list)->next;
 141                        (*list)->next = next;
 142                        list = &(*list)->next;
 143                }
 144        }
 145}
 146
 147static void set_upstreams(struct transport *transport, struct ref *refs,
 148        int pretend)
 149{
 150        struct ref *ref;
 151        for (ref = refs; ref; ref = ref->next) {
 152                const char *localname;
 153                const char *tmp;
 154                const char *remotename;
 155                unsigned char sha[20];
 156                int flag = 0;
 157                /*
 158                 * Check suitability for tracking. Must be successful /
 159                 * already up-to-date ref create/modify (not delete).
 160                 */
 161                if (ref->status != REF_STATUS_OK &&
 162                        ref->status != REF_STATUS_UPTODATE)
 163                        continue;
 164                if (!ref->peer_ref)
 165                        continue;
 166                if (is_null_oid(&ref->new_oid))
 167                        continue;
 168
 169                /* Follow symbolic refs (mainly for HEAD). */
 170                localname = ref->peer_ref->name;
 171                remotename = ref->name;
 172                tmp = resolve_ref_unsafe(localname, RESOLVE_REF_READING,
 173                                         sha, &flag);
 174                if (tmp && flag & REF_ISSYMREF &&
 175                        starts_with(tmp, "refs/heads/"))
 176                        localname = tmp;
 177
 178                /* Both source and destination must be local branches. */
 179                if (!localname || !starts_with(localname, "refs/heads/"))
 180                        continue;
 181                if (!remotename || !starts_with(remotename, "refs/heads/"))
 182                        continue;
 183
 184                if (!pretend)
 185                        install_branch_config(BRANCH_CONFIG_VERBOSE,
 186                                localname + 11, transport->remote->name,
 187                                remotename);
 188                else
 189                        printf("Would set upstream of '%s' to '%s' of '%s'\n",
 190                                localname + 11, remotename + 11,
 191                                transport->remote->name);
 192        }
 193}
 194
 195static const char *rsync_url(const char *url)
 196{
 197        if (!starts_with(url, "rsync://"))
 198                skip_prefix(url, "rsync:", &url);
 199        return url;
 200}
 201
 202static struct ref *get_refs_via_rsync(struct transport *transport, int for_push)
 203{
 204        struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 205        struct ref dummy = {NULL}, *tail = &dummy;
 206        struct child_process rsync = CHILD_PROCESS_INIT;
 207        const char *args[5];
 208        int temp_dir_len;
 209
 210        if (for_push)
 211                return NULL;
 212
 213        /* copy the refs to the temporary directory */
 214
 215        strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 216        if (!mkdtemp(temp_dir.buf))
 217                die_errno ("Could not make temporary directory");
 218        temp_dir_len = temp_dir.len;
 219
 220        strbuf_addstr(&buf, rsync_url(transport->url));
 221        strbuf_addstr(&buf, "/refs");
 222
 223        rsync.argv = args;
 224        rsync.stdout_to_stderr = 1;
 225        args[0] = "rsync";
 226        args[1] = (transport->verbose > 1) ? "-rv" : "-r";
 227        args[2] = buf.buf;
 228        args[3] = temp_dir.buf;
 229        args[4] = NULL;
 230
 231        if (run_command(&rsync))
 232                die ("Could not run rsync to get refs");
 233
 234        strbuf_reset(&buf);
 235        strbuf_addstr(&buf, rsync_url(transport->url));
 236        strbuf_addstr(&buf, "/packed-refs");
 237
 238        args[2] = buf.buf;
 239
 240        if (run_command(&rsync))
 241                die ("Could not run rsync to get refs");
 242
 243        /* read the copied refs */
 244
 245        strbuf_addstr(&temp_dir, "/refs");
 246        read_loose_refs(&temp_dir, temp_dir_len + 1, &tail);
 247        strbuf_setlen(&temp_dir, temp_dir_len);
 248
 249        tail = &dummy;
 250        strbuf_addstr(&temp_dir, "/packed-refs");
 251        insert_packed_refs(temp_dir.buf, &tail);
 252        strbuf_setlen(&temp_dir, temp_dir_len);
 253
 254        if (remove_dir_recursively(&temp_dir, 0))
 255                warning ("Error removing temporary directory %s.",
 256                                temp_dir.buf);
 257
 258        strbuf_release(&buf);
 259        strbuf_release(&temp_dir);
 260
 261        return dummy.next;
 262}
 263
 264static int fetch_objs_via_rsync(struct transport *transport,
 265                                int nr_objs, struct ref **to_fetch)
 266{
 267        struct child_process rsync = CHILD_PROCESS_INIT;
 268
 269        rsync.stdout_to_stderr = 1;
 270        argv_array_push(&rsync.args, "rsync");
 271        argv_array_push(&rsync.args, (transport->verbose > 1) ? "-rv" : "-r");
 272        argv_array_push(&rsync.args, "--ignore-existing");
 273        argv_array_push(&rsync.args, "--exclude");
 274        argv_array_push(&rsync.args, "info");
 275        argv_array_pushf(&rsync.args, "%s/objects/", rsync_url(transport->url));
 276        argv_array_push(&rsync.args, get_object_directory());
 277
 278        /* NEEDSWORK: handle one level of alternates */
 279        return run_command(&rsync);
 280}
 281
 282static int write_one_ref(const char *name, const struct object_id *oid,
 283                         int flags, void *data)
 284{
 285        struct strbuf *buf = data;
 286        int len = buf->len;
 287
 288        /* when called via for_each_ref(), flags is non-zero */
 289        if (flags && !starts_with(name, "refs/heads/") &&
 290                        !starts_with(name, "refs/tags/"))
 291                return 0;
 292
 293        strbuf_addstr(buf, name);
 294        if (safe_create_leading_directories(buf->buf) ||
 295            write_file_gently(buf->buf, "%s", oid_to_hex(oid)))
 296                return error("problems writing temporary file %s: %s",
 297                             buf->buf, strerror(errno));
 298        strbuf_setlen(buf, len);
 299        return 0;
 300}
 301
 302static int write_refs_to_temp_dir(struct strbuf *temp_dir,
 303                                  int refspec_nr, const char **refspec)
 304{
 305        int i;
 306
 307        for (i = 0; i < refspec_nr; i++) {
 308                struct object_id oid;
 309                char *ref;
 310
 311                if (dwim_ref(refspec[i], strlen(refspec[i]), oid.hash, &ref) != 1)
 312                        return error("Could not get ref %s", refspec[i]);
 313
 314                if (write_one_ref(ref, &oid, 0, temp_dir)) {
 315                        free(ref);
 316                        return -1;
 317                }
 318                free(ref);
 319        }
 320        return 0;
 321}
 322
 323static int rsync_transport_push(struct transport *transport,
 324                int refspec_nr, const char **refspec, int flags)
 325{
 326        struct strbuf buf = STRBUF_INIT, temp_dir = STRBUF_INIT;
 327        int result = 0, i;
 328        struct child_process rsync = CHILD_PROCESS_INIT;
 329        const char *args[10];
 330
 331        if (flags & TRANSPORT_PUSH_MIRROR)
 332                return error("rsync transport does not support mirror mode");
 333
 334        /* first push the objects */
 335
 336        strbuf_addstr(&buf, rsync_url(transport->url));
 337        strbuf_addch(&buf, '/');
 338
 339        rsync.argv = args;
 340        rsync.stdout_to_stderr = 1;
 341        i = 0;
 342        args[i++] = "rsync";
 343        args[i++] = "-a";
 344        if (flags & TRANSPORT_PUSH_DRY_RUN)
 345                args[i++] = "--dry-run";
 346        if (transport->verbose > 1)
 347                args[i++] = "-v";
 348        args[i++] = "--ignore-existing";
 349        args[i++] = "--exclude";
 350        args[i++] = "info";
 351        args[i++] = get_object_directory();
 352        args[i++] = buf.buf;
 353        args[i++] = NULL;
 354
 355        if (run_command(&rsync))
 356                return error("Could not push objects to %s",
 357                                rsync_url(transport->url));
 358
 359        /* copy the refs to the temporary directory; they could be packed. */
 360
 361        strbuf_addstr(&temp_dir, git_path("rsync-refs-XXXXXX"));
 362        if (!mkdtemp(temp_dir.buf))
 363                die_errno ("Could not make temporary directory");
 364        strbuf_addch(&temp_dir, '/');
 365
 366        if (flags & TRANSPORT_PUSH_ALL) {
 367                if (for_each_ref(write_one_ref, &temp_dir))
 368                        return -1;
 369        } else if (write_refs_to_temp_dir(&temp_dir, refspec_nr, refspec))
 370                return -1;
 371
 372        i = 2;
 373        if (flags & TRANSPORT_PUSH_DRY_RUN)
 374                args[i++] = "--dry-run";
 375        if (!(flags & TRANSPORT_PUSH_FORCE))
 376                args[i++] = "--ignore-existing";
 377        args[i++] = temp_dir.buf;
 378        args[i++] = rsync_url(transport->url);
 379        args[i++] = NULL;
 380        if (run_command(&rsync))
 381                result = error("Could not push to %s",
 382                                rsync_url(transport->url));
 383
 384        if (remove_dir_recursively(&temp_dir, 0))
 385                warning ("Could not remove temporary directory %s.",
 386                                temp_dir.buf);
 387
 388        strbuf_release(&buf);
 389        strbuf_release(&temp_dir);
 390
 391        return result;
 392}
 393
 394struct bundle_transport_data {
 395        int fd;
 396        struct bundle_header header;
 397};
 398
 399static struct ref *get_refs_from_bundle(struct transport *transport, int for_push)
 400{
 401        struct bundle_transport_data *data = transport->data;
 402        struct ref *result = NULL;
 403        int i;
 404
 405        if (for_push)
 406                return NULL;
 407
 408        if (data->fd > 0)
 409                close(data->fd);
 410        data->fd = read_bundle_header(transport->url, &data->header);
 411        if (data->fd < 0)
 412                die ("Could not read bundle '%s'.", transport->url);
 413        for (i = 0; i < data->header.references.nr; i++) {
 414                struct ref_list_entry *e = data->header.references.list + i;
 415                struct ref *ref = alloc_ref(e->name);
 416                hashcpy(ref->old_oid.hash, e->sha1);
 417                ref->next = result;
 418                result = ref;
 419        }
 420        return result;
 421}
 422
 423static int fetch_refs_from_bundle(struct transport *transport,
 424                               int nr_heads, struct ref **to_fetch)
 425{
 426        struct bundle_transport_data *data = transport->data;
 427        return unbundle(&data->header, data->fd,
 428                        transport->progress ? BUNDLE_VERBOSE : 0);
 429}
 430
 431static int close_bundle(struct transport *transport)
 432{
 433        struct bundle_transport_data *data = transport->data;
 434        if (data->fd > 0)
 435                close(data->fd);
 436        free(data);
 437        return 0;
 438}
 439
 440struct git_transport_data {
 441        struct git_transport_options options;
 442        struct child_process *conn;
 443        int fd[2];
 444        unsigned got_remote_heads : 1;
 445        struct sha1_array extra_have;
 446        struct sha1_array shallow;
 447};
 448
 449static int set_git_option(struct git_transport_options *opts,
 450                          const char *name, const char *value)
 451{
 452        if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 453                opts->uploadpack = value;
 454                return 0;
 455        } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 456                opts->receivepack = value;
 457                return 0;
 458        } else if (!strcmp(name, TRANS_OPT_THIN)) {
 459                opts->thin = !!value;
 460                return 0;
 461        } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
 462                opts->followtags = !!value;
 463                return 0;
 464        } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 465                opts->keep = !!value;
 466                return 0;
 467        } else if (!strcmp(name, TRANS_OPT_UPDATE_SHALLOW)) {
 468                opts->update_shallow = !!value;
 469                return 0;
 470        } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 471                if (!value)
 472                        opts->depth = 0;
 473                else {
 474                        char *end;
 475                        opts->depth = strtol(value, &end, 0);
 476                        if (*end)
 477                                die("transport: invalid depth option '%s'", value);
 478                }
 479                return 0;
 480        }
 481        return 1;
 482}
 483
 484static int connect_setup(struct transport *transport, int for_push, int verbose)
 485{
 486        struct git_transport_data *data = transport->data;
 487
 488        if (data->conn)
 489                return 0;
 490
 491        data->conn = git_connect(data->fd, transport->url,
 492                                 for_push ? data->options.receivepack :
 493                                 data->options.uploadpack,
 494                                 verbose ? CONNECT_VERBOSE : 0);
 495
 496        return 0;
 497}
 498
 499static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
 500{
 501        struct git_transport_data *data = transport->data;
 502        struct ref *refs;
 503
 504        connect_setup(transport, for_push, 0);
 505        get_remote_heads(data->fd[0], NULL, 0, &refs,
 506                         for_push ? REF_NORMAL : 0,
 507                         &data->extra_have,
 508                         &data->shallow);
 509        data->got_remote_heads = 1;
 510
 511        return refs;
 512}
 513
 514static int fetch_refs_via_pack(struct transport *transport,
 515                               int nr_heads, struct ref **to_fetch)
 516{
 517        struct git_transport_data *data = transport->data;
 518        struct ref *refs;
 519        char *dest = xstrdup(transport->url);
 520        struct fetch_pack_args args;
 521        struct ref *refs_tmp = NULL;
 522
 523        memset(&args, 0, sizeof(args));
 524        args.uploadpack = data->options.uploadpack;
 525        args.keep_pack = data->options.keep;
 526        args.lock_pack = 1;
 527        args.use_thin_pack = data->options.thin;
 528        args.include_tag = data->options.followtags;
 529        args.verbose = (transport->verbose > 1);
 530        args.quiet = (transport->verbose < 0);
 531        args.no_progress = !transport->progress;
 532        args.depth = data->options.depth;
 533        args.check_self_contained_and_connected =
 534                data->options.check_self_contained_and_connected;
 535        args.cloning = transport->cloning;
 536        args.update_shallow = data->options.update_shallow;
 537
 538        if (!data->got_remote_heads) {
 539                connect_setup(transport, 0, 0);
 540                get_remote_heads(data->fd[0], NULL, 0, &refs_tmp, 0,
 541                                 NULL, &data->shallow);
 542                data->got_remote_heads = 1;
 543        }
 544
 545        refs = fetch_pack(&args, data->fd, data->conn,
 546                          refs_tmp ? refs_tmp : transport->remote_refs,
 547                          dest, to_fetch, nr_heads, &data->shallow,
 548                          &transport->pack_lockfile);
 549        close(data->fd[0]);
 550        close(data->fd[1]);
 551        if (finish_connect(data->conn)) {
 552                free_refs(refs);
 553                refs = NULL;
 554        }
 555        data->conn = NULL;
 556        data->got_remote_heads = 0;
 557        data->options.self_contained_and_connected =
 558                args.self_contained_and_connected;
 559
 560        free_refs(refs_tmp);
 561        free_refs(refs);
 562        free(dest);
 563        return (refs ? 0 : -1);
 564}
 565
 566static int push_had_errors(struct ref *ref)
 567{
 568        for (; ref; ref = ref->next) {
 569                switch (ref->status) {
 570                case REF_STATUS_NONE:
 571                case REF_STATUS_UPTODATE:
 572                case REF_STATUS_OK:
 573                        break;
 574                default:
 575                        return 1;
 576                }
 577        }
 578        return 0;
 579}
 580
 581int transport_refs_pushed(struct ref *ref)
 582{
 583        for (; ref; ref = ref->next) {
 584                switch(ref->status) {
 585                case REF_STATUS_NONE:
 586                case REF_STATUS_UPTODATE:
 587                        break;
 588                default:
 589                        return 1;
 590                }
 591        }
 592        return 0;
 593}
 594
 595void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 596{
 597        struct refspec rs;
 598
 599        if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 600                return;
 601
 602        rs.src = ref->name;
 603        rs.dst = NULL;
 604
 605        if (!remote_find_tracking(remote, &rs)) {
 606                if (verbose)
 607                        fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 608                if (ref->deletion) {
 609                        delete_ref(rs.dst, NULL, 0);
 610                } else
 611                        update_ref("update by push", rs.dst,
 612                                        ref->new_oid.hash, NULL, 0, 0);
 613                free(rs.dst);
 614        }
 615}
 616
 617static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg, int porcelain)
 618{
 619        if (porcelain) {
 620                if (from)
 621                        fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 622                else
 623                        fprintf(stdout, "%c\t:%s\t", flag, to->name);
 624                if (msg)
 625                        fprintf(stdout, "%s (%s)\n", summary, msg);
 626                else
 627                        fprintf(stdout, "%s\n", summary);
 628        } else {
 629                fprintf(stderr, " %c %-*s ", flag, TRANSPORT_SUMMARY_WIDTH, summary);
 630                if (from)
 631                        fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 632                else
 633                        fputs(prettify_refname(to->name), stderr);
 634                if (msg) {
 635                        fputs(" (", stderr);
 636                        fputs(msg, stderr);
 637                        fputc(')', stderr);
 638                }
 639                fputc('\n', stderr);
 640        }
 641}
 642
 643static const char *status_abbrev(unsigned char sha1[20])
 644{
 645        return find_unique_abbrev(sha1, DEFAULT_ABBREV);
 646}
 647
 648static void print_ok_ref_status(struct ref *ref, int porcelain)
 649{
 650        if (ref->deletion)
 651                print_ref_status('-', "[deleted]", ref, NULL, NULL, porcelain);
 652        else if (is_null_oid(&ref->old_oid))
 653                print_ref_status('*',
 654                        (starts_with(ref->name, "refs/tags/") ? "[new tag]" :
 655                        "[new branch]"),
 656                        ref, ref->peer_ref, NULL, porcelain);
 657        else {
 658                struct strbuf quickref = STRBUF_INIT;
 659                char type;
 660                const char *msg;
 661
 662                strbuf_addstr(&quickref, status_abbrev(ref->old_oid.hash));
 663                if (ref->forced_update) {
 664                        strbuf_addstr(&quickref, "...");
 665                        type = '+';
 666                        msg = "forced update";
 667                } else {
 668                        strbuf_addstr(&quickref, "..");
 669                        type = ' ';
 670                        msg = NULL;
 671                }
 672                strbuf_addstr(&quickref, status_abbrev(ref->new_oid.hash));
 673
 674                print_ref_status(type, quickref.buf, ref, ref->peer_ref, msg, porcelain);
 675                strbuf_release(&quickref);
 676        }
 677}
 678
 679static int print_one_push_status(struct ref *ref, const char *dest, int count, int porcelain)
 680{
 681        if (!count)
 682                fprintf(porcelain ? stdout : stderr, "To %s\n", dest);
 683
 684        switch(ref->status) {
 685        case REF_STATUS_NONE:
 686                print_ref_status('X', "[no match]", ref, NULL, NULL, porcelain);
 687                break;
 688        case REF_STATUS_REJECT_NODELETE:
 689                print_ref_status('!', "[rejected]", ref, NULL,
 690                                                 "remote does not support deleting refs", porcelain);
 691                break;
 692        case REF_STATUS_UPTODATE:
 693                print_ref_status('=', "[up to date]", ref,
 694                                                 ref->peer_ref, NULL, porcelain);
 695                break;
 696        case REF_STATUS_REJECT_NONFASTFORWARD:
 697                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 698                                                 "non-fast-forward", porcelain);
 699                break;
 700        case REF_STATUS_REJECT_ALREADY_EXISTS:
 701                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 702                                                 "already exists", porcelain);
 703                break;
 704        case REF_STATUS_REJECT_FETCH_FIRST:
 705                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 706                                                 "fetch first", porcelain);
 707                break;
 708        case REF_STATUS_REJECT_NEEDS_FORCE:
 709                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 710                                                 "needs force", porcelain);
 711                break;
 712        case REF_STATUS_REJECT_STALE:
 713                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 714                                                 "stale info", porcelain);
 715                break;
 716        case REF_STATUS_REJECT_SHALLOW:
 717                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 718                                                 "new shallow roots not allowed", porcelain);
 719                break;
 720        case REF_STATUS_REMOTE_REJECT:
 721                print_ref_status('!', "[remote rejected]", ref,
 722                                                 ref->deletion ? NULL : ref->peer_ref,
 723                                                 ref->remote_status, porcelain);
 724                break;
 725        case REF_STATUS_EXPECTING_REPORT:
 726                print_ref_status('!', "[remote failure]", ref,
 727                                                 ref->deletion ? NULL : ref->peer_ref,
 728                                                 "remote failed to report status", porcelain);
 729                break;
 730        case REF_STATUS_ATOMIC_PUSH_FAILED:
 731                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 732                                                 "atomic push failed", porcelain);
 733                break;
 734        case REF_STATUS_OK:
 735                print_ok_ref_status(ref, porcelain);
 736                break;
 737        }
 738
 739        return 1;
 740}
 741
 742void transport_print_push_status(const char *dest, struct ref *refs,
 743                                  int verbose, int porcelain, unsigned int *reject_reasons)
 744{
 745        struct ref *ref;
 746        int n = 0;
 747        unsigned char head_sha1[20];
 748        char *head;
 749
 750        head = resolve_refdup("HEAD", RESOLVE_REF_READING, head_sha1, NULL);
 751
 752        if (verbose) {
 753                for (ref = refs; ref; ref = ref->next)
 754                        if (ref->status == REF_STATUS_UPTODATE)
 755                                n += print_one_push_status(ref, dest, n, porcelain);
 756        }
 757
 758        for (ref = refs; ref; ref = ref->next)
 759                if (ref->status == REF_STATUS_OK)
 760                        n += print_one_push_status(ref, dest, n, porcelain);
 761
 762        *reject_reasons = 0;
 763        for (ref = refs; ref; ref = ref->next) {
 764                if (ref->status != REF_STATUS_NONE &&
 765                    ref->status != REF_STATUS_UPTODATE &&
 766                    ref->status != REF_STATUS_OK)
 767                        n += print_one_push_status(ref, dest, n, porcelain);
 768                if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
 769                        if (head != NULL && !strcmp(head, ref->name))
 770                                *reject_reasons |= REJECT_NON_FF_HEAD;
 771                        else
 772                                *reject_reasons |= REJECT_NON_FF_OTHER;
 773                } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
 774                        *reject_reasons |= REJECT_ALREADY_EXISTS;
 775                } else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
 776                        *reject_reasons |= REJECT_FETCH_FIRST;
 777                } else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
 778                        *reject_reasons |= REJECT_NEEDS_FORCE;
 779                }
 780        }
 781        free(head);
 782}
 783
 784void transport_verify_remote_names(int nr_heads, const char **heads)
 785{
 786        int i;
 787
 788        for (i = 0; i < nr_heads; i++) {
 789                const char *local = heads[i];
 790                const char *remote = strrchr(heads[i], ':');
 791
 792                if (*local == '+')
 793                        local++;
 794
 795                /* A matching refspec is okay.  */
 796                if (remote == local && remote[1] == '\0')
 797                        continue;
 798
 799                remote = remote ? (remote + 1) : local;
 800                if (check_refname_format(remote,
 801                                REFNAME_ALLOW_ONELEVEL|REFNAME_REFSPEC_PATTERN))
 802                        die("remote part of refspec is not a valid name in %s",
 803                                heads[i]);
 804        }
 805}
 806
 807static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 808{
 809        struct git_transport_data *data = transport->data;
 810        struct send_pack_args args;
 811        int ret;
 812
 813        if (!data->got_remote_heads) {
 814                struct ref *tmp_refs;
 815                connect_setup(transport, 1, 0);
 816
 817                get_remote_heads(data->fd[0], NULL, 0, &tmp_refs, REF_NORMAL,
 818                                 NULL, &data->shallow);
 819                data->got_remote_heads = 1;
 820        }
 821
 822        memset(&args, 0, sizeof(args));
 823        args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 824        args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 825        args.use_thin_pack = data->options.thin;
 826        args.verbose = (transport->verbose > 0);
 827        args.quiet = (transport->verbose < 0);
 828        args.progress = transport->progress;
 829        args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 830        args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
 831        args.atomic = !!(flags & TRANSPORT_PUSH_ATOMIC);
 832        args.url = transport->url;
 833
 834        if (flags & TRANSPORT_PUSH_CERT_ALWAYS)
 835                args.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 836        else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED)
 837                args.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 838        else
 839                args.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 840
 841        ret = send_pack(&args, data->fd, data->conn, remote_refs,
 842                        &data->extra_have);
 843
 844        close(data->fd[1]);
 845        close(data->fd[0]);
 846        ret |= finish_connect(data->conn);
 847        data->conn = NULL;
 848        data->got_remote_heads = 0;
 849
 850        return ret;
 851}
 852
 853static int connect_git(struct transport *transport, const char *name,
 854                       const char *executable, int fd[2])
 855{
 856        struct git_transport_data *data = transport->data;
 857        data->conn = git_connect(data->fd, transport->url,
 858                                 executable, 0);
 859        fd[0] = data->fd[0];
 860        fd[1] = data->fd[1];
 861        return 0;
 862}
 863
 864static int disconnect_git(struct transport *transport)
 865{
 866        struct git_transport_data *data = transport->data;
 867        if (data->conn) {
 868                if (data->got_remote_heads)
 869                        packet_flush(data->fd[1]);
 870                close(data->fd[0]);
 871                close(data->fd[1]);
 872                finish_connect(data->conn);
 873        }
 874
 875        free(data);
 876        return 0;
 877}
 878
 879void transport_take_over(struct transport *transport,
 880                         struct child_process *child)
 881{
 882        struct git_transport_data *data;
 883
 884        if (!transport->smart_options)
 885                die("Bug detected: Taking over transport requires non-NULL "
 886                    "smart_options field.");
 887
 888        data = xcalloc(1, sizeof(*data));
 889        data->options = *transport->smart_options;
 890        data->conn = child;
 891        data->fd[0] = data->conn->out;
 892        data->fd[1] = data->conn->in;
 893        data->got_remote_heads = 0;
 894        transport->data = data;
 895
 896        transport->set_option = NULL;
 897        transport->get_refs_list = get_refs_via_connect;
 898        transport->fetch = fetch_refs_via_pack;
 899        transport->push = NULL;
 900        transport->push_refs = git_transport_push;
 901        transport->disconnect = disconnect_git;
 902        transport->smart_options = &(data->options);
 903
 904        transport->cannot_reuse = 1;
 905}
 906
 907static int is_file(const char *url)
 908{
 909        struct stat buf;
 910        if (stat(url, &buf))
 911                return 0;
 912        return S_ISREG(buf.st_mode);
 913}
 914
 915static int external_specification_len(const char *url)
 916{
 917        return strchr(url, ':') - url;
 918}
 919
 920static const struct string_list *protocol_whitelist(void)
 921{
 922        static int enabled = -1;
 923        static struct string_list allowed = STRING_LIST_INIT_DUP;
 924
 925        if (enabled < 0) {
 926                const char *v = getenv("GIT_ALLOW_PROTOCOL");
 927                if (v) {
 928                        string_list_split(&allowed, v, ':', -1);
 929                        string_list_sort(&allowed);
 930                        enabled = 1;
 931                } else {
 932                        enabled = 0;
 933                }
 934        }
 935
 936        return enabled ? &allowed : NULL;
 937}
 938
 939int is_transport_allowed(const char *type)
 940{
 941        const struct string_list *allowed = protocol_whitelist();
 942        return !allowed || string_list_has_string(allowed, type);
 943}
 944
 945void transport_check_allowed(const char *type)
 946{
 947        if (!is_transport_allowed(type))
 948                die("transport '%s' not allowed", type);
 949}
 950
 951int transport_restrict_protocols(void)
 952{
 953        return !!protocol_whitelist();
 954}
 955
 956struct transport *transport_get(struct remote *remote, const char *url)
 957{
 958        const char *helper;
 959        struct transport *ret = xcalloc(1, sizeof(*ret));
 960
 961        ret->progress = isatty(2);
 962
 963        if (!remote)
 964                die("No remote provided to transport_get()");
 965
 966        ret->got_remote_refs = 0;
 967        ret->remote = remote;
 968        helper = remote->foreign_vcs;
 969
 970        if (!url && remote->url)
 971                url = remote->url[0];
 972        ret->url = url;
 973
 974        /* maybe it is a foreign URL? */
 975        if (url) {
 976                const char *p = url;
 977
 978                while (is_urlschemechar(p == url, *p))
 979                        p++;
 980                if (starts_with(p, "::"))
 981                        helper = xstrndup(url, p - url);
 982        }
 983
 984        if (helper) {
 985                transport_helper_init(ret, helper);
 986        } else if (starts_with(url, "rsync:")) {
 987                transport_check_allowed("rsync");
 988                ret->get_refs_list = get_refs_via_rsync;
 989                ret->fetch = fetch_objs_via_rsync;
 990                ret->push = rsync_transport_push;
 991                ret->smart_options = NULL;
 992        } else if (url_is_local_not_ssh(url) && is_file(url) && is_bundle(url, 1)) {
 993                struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 994                transport_check_allowed("file");
 995                ret->data = data;
 996                ret->get_refs_list = get_refs_from_bundle;
 997                ret->fetch = fetch_refs_from_bundle;
 998                ret->disconnect = close_bundle;
 999                ret->smart_options = NULL;
1000        } else if (!is_url(url)
1001                || starts_with(url, "file://")
1002                || starts_with(url, "git://")
1003                || starts_with(url, "ssh://")
1004                || starts_with(url, "git+ssh://")
1005                || starts_with(url, "ssh+git://")) {
1006                /*
1007                 * These are builtin smart transports; "allowed" transports
1008                 * will be checked individually in git_connect.
1009                 */
1010                struct git_transport_data *data = xcalloc(1, sizeof(*data));
1011                ret->data = data;
1012                ret->set_option = NULL;
1013                ret->get_refs_list = get_refs_via_connect;
1014                ret->fetch = fetch_refs_via_pack;
1015                ret->push_refs = git_transport_push;
1016                ret->connect = connect_git;
1017                ret->disconnect = disconnect_git;
1018                ret->smart_options = &(data->options);
1019
1020                data->conn = NULL;
1021                data->got_remote_heads = 0;
1022        } else {
1023                /* Unknown protocol in URL. Pass to external handler. */
1024                int len = external_specification_len(url);
1025                char *handler = xmemdupz(url, len);
1026                transport_helper_init(ret, handler);
1027        }
1028
1029        if (ret->smart_options) {
1030                ret->smart_options->thin = 1;
1031                ret->smart_options->uploadpack = "git-upload-pack";
1032                if (remote->uploadpack)
1033                        ret->smart_options->uploadpack = remote->uploadpack;
1034                ret->smart_options->receivepack = "git-receive-pack";
1035                if (remote->receivepack)
1036                        ret->smart_options->receivepack = remote->receivepack;
1037        }
1038
1039        return ret;
1040}
1041
1042int transport_set_option(struct transport *transport,
1043                         const char *name, const char *value)
1044{
1045        int git_reports = 1, protocol_reports = 1;
1046
1047        if (transport->smart_options)
1048                git_reports = set_git_option(transport->smart_options,
1049                                             name, value);
1050
1051        if (transport->set_option)
1052                protocol_reports = transport->set_option(transport, name,
1053                                                        value);
1054
1055        /* If either report is 0, report 0 (success). */
1056        if (!git_reports || !protocol_reports)
1057                return 0;
1058        /* If either reports -1 (invalid value), report -1. */
1059        if ((git_reports == -1) || (protocol_reports == -1))
1060                return -1;
1061        /* Otherwise if both report unknown, report unknown. */
1062        return 1;
1063}
1064
1065void transport_set_verbosity(struct transport *transport, int verbosity,
1066        int force_progress)
1067{
1068        if (verbosity >= 1)
1069                transport->verbose = verbosity <= 3 ? verbosity : 3;
1070        if (verbosity < 0)
1071                transport->verbose = -1;
1072
1073        /**
1074         * Rules used to determine whether to report progress (processing aborts
1075         * when a rule is satisfied):
1076         *
1077         *   . Report progress, if force_progress is 1 (ie. --progress).
1078         *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
1079         *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
1080         *   . Report progress if isatty(2) is 1.
1081         **/
1082        if (force_progress >= 0)
1083                transport->progress = !!force_progress;
1084        else
1085                transport->progress = verbosity >= 0 && isatty(2);
1086}
1087
1088static void die_with_unpushed_submodules(struct string_list *needs_pushing)
1089{
1090        int i;
1091
1092        fprintf(stderr, "The following submodule paths contain changes that can\n"
1093                        "not be found on any remote:\n");
1094        for (i = 0; i < needs_pushing->nr; i++)
1095                printf("  %s\n", needs_pushing->items[i].string);
1096        fprintf(stderr, "\nPlease try\n\n"
1097                        "       git push --recurse-submodules=on-demand\n\n"
1098                        "or cd to the path and use\n\n"
1099                        "       git push\n\n"
1100                        "to push them to a remote.\n\n");
1101
1102        string_list_clear(needs_pushing, 0);
1103
1104        die("Aborting.");
1105}
1106
1107static int run_pre_push_hook(struct transport *transport,
1108                             struct ref *remote_refs)
1109{
1110        int ret = 0, x;
1111        struct ref *r;
1112        struct child_process proc = CHILD_PROCESS_INIT;
1113        struct strbuf buf;
1114        const char *argv[4];
1115
1116        if (!(argv[0] = find_hook("pre-push")))
1117                return 0;
1118
1119        argv[1] = transport->remote->name;
1120        argv[2] = transport->url;
1121        argv[3] = NULL;
1122
1123        proc.argv = argv;
1124        proc.in = -1;
1125
1126        if (start_command(&proc)) {
1127                finish_command(&proc);
1128                return -1;
1129        }
1130
1131        sigchain_push(SIGPIPE, SIG_IGN);
1132
1133        strbuf_init(&buf, 256);
1134
1135        for (r = remote_refs; r; r = r->next) {
1136                if (!r->peer_ref) continue;
1137                if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
1138                if (r->status == REF_STATUS_REJECT_STALE) continue;
1139                if (r->status == REF_STATUS_UPTODATE) continue;
1140
1141                strbuf_reset(&buf);
1142                strbuf_addf( &buf, "%s %s %s %s\n",
1143                         r->peer_ref->name, oid_to_hex(&r->new_oid),
1144                         r->name, oid_to_hex(&r->old_oid));
1145
1146                if (write_in_full(proc.in, buf.buf, buf.len) < 0) {
1147                        /* We do not mind if a hook does not read all refs. */
1148                        if (errno != EPIPE)
1149                                ret = -1;
1150                        break;
1151                }
1152        }
1153
1154        strbuf_release(&buf);
1155
1156        x = close(proc.in);
1157        if (!ret)
1158                ret = x;
1159
1160        sigchain_pop(SIGPIPE);
1161
1162        x = finish_command(&proc);
1163        if (!ret)
1164                ret = x;
1165
1166        return ret;
1167}
1168
1169int transport_push(struct transport *transport,
1170                   int refspec_nr, const char **refspec, int flags,
1171                   unsigned int *reject_reasons)
1172{
1173        *reject_reasons = 0;
1174        transport_verify_remote_names(refspec_nr, refspec);
1175
1176        if (transport->push) {
1177                /* Maybe FIXME. But no important transport uses this case. */
1178                if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1179                        die("This transport does not support using --set-upstream");
1180
1181                return transport->push(transport, refspec_nr, refspec, flags);
1182        } else if (transport->push_refs) {
1183                struct ref *remote_refs;
1184                struct ref *local_refs = get_local_heads();
1185                int match_flags = MATCH_REFS_NONE;
1186                int verbose = (transport->verbose > 0);
1187                int quiet = (transport->verbose < 0);
1188                int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
1189                int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
1190                int push_ret, ret, err;
1191
1192                if (check_push_refs(local_refs, refspec_nr, refspec) < 0)
1193                        return -1;
1194
1195                remote_refs = transport->get_refs_list(transport, 1);
1196
1197                if (flags & TRANSPORT_PUSH_ALL)
1198                        match_flags |= MATCH_REFS_ALL;
1199                if (flags & TRANSPORT_PUSH_MIRROR)
1200                        match_flags |= MATCH_REFS_MIRROR;
1201                if (flags & TRANSPORT_PUSH_PRUNE)
1202                        match_flags |= MATCH_REFS_PRUNE;
1203                if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
1204                        match_flags |= MATCH_REFS_FOLLOW_TAGS;
1205
1206                if (match_push_refs(local_refs, &remote_refs,
1207                                    refspec_nr, refspec, match_flags)) {
1208                        return -1;
1209                }
1210
1211                if (transport->smart_options &&
1212                    transport->smart_options->cas &&
1213                    !is_empty_cas(transport->smart_options->cas))
1214                        apply_push_cas(transport->smart_options->cas,
1215                                       transport->remote, remote_refs);
1216
1217                set_ref_status_for_push(remote_refs,
1218                        flags & TRANSPORT_PUSH_MIRROR,
1219                        flags & TRANSPORT_PUSH_FORCE);
1220
1221                if (!(flags & TRANSPORT_PUSH_NO_HOOK))
1222                        if (run_pre_push_hook(transport, remote_refs))
1223                                return -1;
1224
1225                if ((flags & TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND) && !is_bare_repository()) {
1226                        struct ref *ref = remote_refs;
1227                        for (; ref; ref = ref->next)
1228                                if (!is_null_oid(&ref->new_oid) &&
1229                                    !push_unpushed_submodules(ref->new_oid.hash,
1230                                            transport->remote->name))
1231                                    die ("Failed to push all needed submodules!");
1232                }
1233
1234                if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1235                              TRANSPORT_RECURSE_SUBMODULES_CHECK)) && !is_bare_repository()) {
1236                        struct ref *ref = remote_refs;
1237                        struct string_list needs_pushing = STRING_LIST_INIT_DUP;
1238
1239                        for (; ref; ref = ref->next)
1240                                if (!is_null_oid(&ref->new_oid) &&
1241                                    find_unpushed_submodules(ref->new_oid.hash,
1242                                            transport->remote->name, &needs_pushing))
1243                                        die_with_unpushed_submodules(&needs_pushing);
1244                }
1245
1246                push_ret = transport->push_refs(transport, remote_refs, flags);
1247                err = push_had_errors(remote_refs);
1248                ret = push_ret | err;
1249
1250                if (!quiet || err)
1251                        transport_print_push_status(transport->url, remote_refs,
1252                                        verbose | porcelain, porcelain,
1253                                        reject_reasons);
1254
1255                if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1256                        set_upstreams(transport, remote_refs, pretend);
1257
1258                if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
1259                        struct ref *ref;
1260                        for (ref = remote_refs; ref; ref = ref->next)
1261                                transport_update_tracking_ref(transport->remote, ref, verbose);
1262                }
1263
1264                if (porcelain && !push_ret)
1265                        puts("Done");
1266                else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
1267                        fprintf(stderr, "Everything up-to-date\n");
1268
1269                return ret;
1270        }
1271        return 1;
1272}
1273
1274const struct ref *transport_get_remote_refs(struct transport *transport)
1275{
1276        if (!transport->got_remote_refs) {
1277                transport->remote_refs = transport->get_refs_list(transport, 0);
1278                transport->got_remote_refs = 1;
1279        }
1280
1281        return transport->remote_refs;
1282}
1283
1284int transport_fetch_refs(struct transport *transport, struct ref *refs)
1285{
1286        int rc;
1287        int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1288        struct ref **heads = NULL;
1289        struct ref *rm;
1290
1291        for (rm = refs; rm; rm = rm->next) {
1292                nr_refs++;
1293                if (rm->peer_ref &&
1294                    !is_null_oid(&rm->old_oid) &&
1295                    !oidcmp(&rm->peer_ref->old_oid, &rm->old_oid))
1296                        continue;
1297                ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1298                heads[nr_heads++] = rm;
1299        }
1300
1301        if (!nr_heads) {
1302                /*
1303                 * When deepening of a shallow repository is requested,
1304                 * then local and remote refs are likely to still be equal.
1305                 * Just feed them all to the fetch method in that case.
1306                 * This condition shouldn't be met in a non-deepening fetch
1307                 * (see builtin/fetch.c:quickfetch()).
1308                 */
1309                ALLOC_ARRAY(heads, nr_refs);
1310                for (rm = refs; rm; rm = rm->next)
1311                        heads[nr_heads++] = rm;
1312        }
1313
1314        rc = transport->fetch(transport, nr_heads, heads);
1315
1316        free(heads);
1317        return rc;
1318}
1319
1320void transport_unlock_pack(struct transport *transport)
1321{
1322        if (transport->pack_lockfile) {
1323                unlink_or_warn(transport->pack_lockfile);
1324                free(transport->pack_lockfile);
1325                transport->pack_lockfile = NULL;
1326        }
1327}
1328
1329int transport_connect(struct transport *transport, const char *name,
1330                      const char *exec, int fd[2])
1331{
1332        if (transport->connect)
1333                return transport->connect(transport, name, exec, fd);
1334        else
1335                die("Operation not supported by protocol");
1336}
1337
1338int transport_disconnect(struct transport *transport)
1339{
1340        int ret = 0;
1341        if (transport->disconnect)
1342                ret = transport->disconnect(transport);
1343        free(transport);
1344        return ret;
1345}
1346
1347/*
1348 * Strip username (and password) from a URL and return
1349 * it in a newly allocated string.
1350 */
1351char *transport_anonymize_url(const char *url)
1352{
1353        char *anon_url, *scheme_prefix, *anon_part;
1354        size_t anon_len, prefix_len = 0;
1355
1356        anon_part = strchr(url, '@');
1357        if (url_is_local_not_ssh(url) || !anon_part)
1358                goto literal_copy;
1359
1360        anon_len = strlen(++anon_part);
1361        scheme_prefix = strstr(url, "://");
1362        if (!scheme_prefix) {
1363                if (!strchr(anon_part, ':'))
1364                        /* cannot be "me@there:/path/name" */
1365                        goto literal_copy;
1366        } else {
1367                const char *cp;
1368                /* make sure scheme is reasonable */
1369                for (cp = url; cp < scheme_prefix; cp++) {
1370                        switch (*cp) {
1371                                /* RFC 1738 2.1 */
1372                        case '+': case '.': case '-':
1373                                break; /* ok */
1374                        default:
1375                                if (isalnum(*cp))
1376                                        break;
1377                                /* it isn't */
1378                                goto literal_copy;
1379                        }
1380                }
1381                /* @ past the first slash does not count */
1382                cp = strchr(scheme_prefix + 3, '/');
1383                if (cp && cp < anon_part)
1384                        goto literal_copy;
1385                prefix_len = scheme_prefix - url + 3;
1386        }
1387        anon_url = xcalloc(1, 1 + prefix_len + anon_len);
1388        memcpy(anon_url, url, prefix_len);
1389        memcpy(anon_url + prefix_len, anon_part, anon_len);
1390        return anon_url;
1391literal_copy:
1392        return xstrdup(url);
1393}
1394
1395struct alternate_refs_data {
1396        alternate_ref_fn *fn;
1397        void *data;
1398};
1399
1400static int refs_from_alternate_cb(struct alternate_object_database *e,
1401                                  void *data)
1402{
1403        char *other;
1404        size_t len;
1405        struct remote *remote;
1406        struct transport *transport;
1407        const struct ref *extra;
1408        struct alternate_refs_data *cb = data;
1409
1410        e->name[-1] = '\0';
1411        other = xstrdup(real_path(e->base));
1412        e->name[-1] = '/';
1413        len = strlen(other);
1414
1415        while (other[len-1] == '/')
1416                other[--len] = '\0';
1417        if (len < 8 || memcmp(other + len - 8, "/objects", 8))
1418                goto out;
1419        /* Is this a git repository with refs? */
1420        memcpy(other + len - 8, "/refs", 6);
1421        if (!is_directory(other))
1422                goto out;
1423        other[len - 8] = '\0';
1424        remote = remote_get(other);
1425        transport = transport_get(remote, other);
1426        for (extra = transport_get_remote_refs(transport);
1427             extra;
1428             extra = extra->next)
1429                cb->fn(extra, cb->data);
1430        transport_disconnect(transport);
1431out:
1432        free(other);
1433        return 0;
1434}
1435
1436void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1437{
1438        struct alternate_refs_data cb;
1439        cb.fn = fn;
1440        cb.data = data;
1441        foreach_alt_odb(refs_from_alternate_cb, &cb);
1442}