6b56473f5bb7d8ab2226ed83805f30c9e21ba773
   1#include "cache.h"
   2#include "remote.h"
   3#include "refs.h"
   4
   5static struct remote **remotes;
   6static int allocated_remotes;
   7
   8static struct branch **branches;
   9static int allocated_branches;
  10
  11static struct branch *current_branch;
  12static const char *default_remote_name;
  13
  14#define BUF_SIZE (2048)
  15static char buffer[BUF_SIZE];
  16
  17static void add_push_refspec(struct remote *remote, const char *ref)
  18{
  19        int nr = remote->push_refspec_nr + 1;
  20        remote->push_refspec =
  21                xrealloc(remote->push_refspec, nr * sizeof(char *));
  22        remote->push_refspec[nr-1] = ref;
  23        remote->push_refspec_nr = nr;
  24}
  25
  26static void add_fetch_refspec(struct remote *remote, const char *ref)
  27{
  28        int nr = remote->fetch_refspec_nr + 1;
  29        remote->fetch_refspec =
  30                xrealloc(remote->fetch_refspec, nr * sizeof(char *));
  31        remote->fetch_refspec[nr-1] = ref;
  32        remote->fetch_refspec_nr = nr;
  33}
  34
  35static void add_url(struct remote *remote, const char *url)
  36{
  37        int nr = remote->url_nr + 1;
  38        remote->url =
  39                xrealloc(remote->url, nr * sizeof(char *));
  40        remote->url[nr-1] = url;
  41        remote->url_nr = nr;
  42}
  43
  44static struct remote *make_remote(const char *name, int len)
  45{
  46        int i, empty = -1;
  47
  48        for (i = 0; i < allocated_remotes; i++) {
  49                if (!remotes[i]) {
  50                        if (empty < 0)
  51                                empty = i;
  52                } else {
  53                        if (len ? (!strncmp(name, remotes[i]->name, len) &&
  54                                   !remotes[i]->name[len]) :
  55                            !strcmp(name, remotes[i]->name))
  56                                return remotes[i];
  57                }
  58        }
  59
  60        if (empty < 0) {
  61                empty = allocated_remotes;
  62                allocated_remotes += allocated_remotes ? allocated_remotes : 1;
  63                remotes = xrealloc(remotes,
  64                                   sizeof(*remotes) * allocated_remotes);
  65                memset(remotes + empty, 0,
  66                       (allocated_remotes - empty) * sizeof(*remotes));
  67        }
  68        remotes[empty] = xcalloc(1, sizeof(struct remote));
  69        if (len)
  70                remotes[empty]->name = xstrndup(name, len);
  71        else
  72                remotes[empty]->name = xstrdup(name);
  73        return remotes[empty];
  74}
  75
  76static void add_merge(struct branch *branch, const char *name)
  77{
  78        int nr = branch->merge_nr + 1;
  79        branch->merge_name =
  80                xrealloc(branch->merge_name, nr * sizeof(char *));
  81        branch->merge_name[nr-1] = name;
  82        branch->merge_nr = nr;
  83}
  84
  85static struct branch *make_branch(const char *name, int len)
  86{
  87        int i, empty = -1;
  88        char *refname;
  89
  90        for (i = 0; i < allocated_branches; i++) {
  91                if (!branches[i]) {
  92                        if (empty < 0)
  93                                empty = i;
  94                } else {
  95                        if (len ? (!strncmp(name, branches[i]->name, len) &&
  96                                   !branches[i]->name[len]) :
  97                            !strcmp(name, branches[i]->name))
  98                                return branches[i];
  99                }
 100        }
 101
 102        if (empty < 0) {
 103                empty = allocated_branches;
 104                allocated_branches += allocated_branches ? allocated_branches : 1;
 105                branches = xrealloc(branches,
 106                                   sizeof(*branches) * allocated_branches);
 107                memset(branches + empty, 0,
 108                       (allocated_branches - empty) * sizeof(*branches));
 109        }
 110        branches[empty] = xcalloc(1, sizeof(struct branch));
 111        if (len)
 112                branches[empty]->name = xstrndup(name, len);
 113        else
 114                branches[empty]->name = xstrdup(name);
 115        refname = malloc(strlen(name) + strlen("refs/heads/") + 1);
 116        strcpy(refname, "refs/heads/");
 117        strcpy(refname + strlen("refs/heads/"),
 118               branches[empty]->name);
 119        branches[empty]->refname = refname;
 120
 121        return branches[empty];
 122}
 123
 124static void read_remotes_file(struct remote *remote)
 125{
 126        FILE *f = fopen(git_path("remotes/%s", remote->name), "r");
 127
 128        if (!f)
 129                return;
 130        while (fgets(buffer, BUF_SIZE, f)) {
 131                int value_list;
 132                char *s, *p;
 133
 134                if (!prefixcmp(buffer, "URL:")) {
 135                        value_list = 0;
 136                        s = buffer + 4;
 137                } else if (!prefixcmp(buffer, "Push:")) {
 138                        value_list = 1;
 139                        s = buffer + 5;
 140                } else if (!prefixcmp(buffer, "Pull:")) {
 141                        value_list = 2;
 142                        s = buffer + 5;
 143                } else
 144                        continue;
 145
 146                while (isspace(*s))
 147                        s++;
 148                if (!*s)
 149                        continue;
 150
 151                p = s + strlen(s);
 152                while (isspace(p[-1]))
 153                        *--p = 0;
 154
 155                switch (value_list) {
 156                case 0:
 157                        add_url(remote, xstrdup(s));
 158                        break;
 159                case 1:
 160                        add_push_refspec(remote, xstrdup(s));
 161                        break;
 162                case 2:
 163                        add_fetch_refspec(remote, xstrdup(s));
 164                        break;
 165                }
 166        }
 167        fclose(f);
 168}
 169
 170static void read_branches_file(struct remote *remote)
 171{
 172        const char *slash = strchr(remote->name, '/');
 173        char *frag;
 174        char *branch;
 175        int n = slash ? slash - remote->name : 1000;
 176        FILE *f = fopen(git_path("branches/%.*s", n, remote->name), "r");
 177        char *s, *p;
 178        int len;
 179
 180        if (!f)
 181                return;
 182        s = fgets(buffer, BUF_SIZE, f);
 183        fclose(f);
 184        if (!s)
 185                return;
 186        while (isspace(*s))
 187                s++;
 188        if (!*s)
 189                return;
 190        p = s + strlen(s);
 191        while (isspace(p[-1]))
 192                *--p = 0;
 193        len = p - s;
 194        if (slash)
 195                len += strlen(slash);
 196        p = xmalloc(len + 1);
 197        strcpy(p, s);
 198        if (slash)
 199                strcat(p, slash);
 200        frag = strchr(p, '#');
 201        if (frag) {
 202                *(frag++) = '\0';
 203                branch = xmalloc(strlen(frag) + 12);
 204                strcpy(branch, "refs/heads/");
 205                strcat(branch, frag);
 206        } else {
 207                branch = "refs/heads/master";
 208        }
 209        add_url(remote, p);
 210        add_fetch_refspec(remote, branch);
 211        remote->fetch_tags = 1; /* always auto-follow */
 212}
 213
 214static int handle_config(const char *key, const char *value)
 215{
 216        const char *name;
 217        const char *subkey;
 218        struct remote *remote;
 219        struct branch *branch;
 220        if (!prefixcmp(key, "branch.")) {
 221                name = key + 7;
 222                subkey = strrchr(name, '.');
 223                if (!subkey)
 224                        return 0;
 225                branch = make_branch(name, subkey - name);
 226                if (!strcmp(subkey, ".remote")) {
 227                        if (!value)
 228                                return config_error_nonbool(key);
 229                        branch->remote_name = xstrdup(value);
 230                        if (branch == current_branch)
 231                                default_remote_name = branch->remote_name;
 232                } else if (!strcmp(subkey, ".merge")) {
 233                        if (!value)
 234                                return config_error_nonbool(key);
 235                        add_merge(branch, xstrdup(value));
 236                }
 237                return 0;
 238        }
 239        if (prefixcmp(key,  "remote."))
 240                return 0;
 241        name = key + 7;
 242        subkey = strrchr(name, '.');
 243        if (!subkey)
 244                return error("Config with no key for remote %s", name);
 245        if (*subkey == '/') {
 246                warning("Config remote shorthand cannot begin with '/': %s", name);
 247                return 0;
 248        }
 249        remote = make_remote(name, subkey - name);
 250        if (!value) {
 251                /* if we ever have a boolean variable, e.g. "remote.*.disabled"
 252                 * [remote "frotz"]
 253                 *      disabled
 254                 * is a valid way to set it to true; we get NULL in value so
 255                 * we need to handle it here.
 256                 *
 257                 * if (!strcmp(subkey, ".disabled")) {
 258                 *      val = git_config_bool(key, value);
 259                 *      return 0;
 260                 * } else
 261                 *
 262                 */
 263                return 0; /* ignore unknown booleans */
 264        }
 265        if (!strcmp(subkey, ".url")) {
 266                add_url(remote, xstrdup(value));
 267        } else if (!strcmp(subkey, ".push")) {
 268                add_push_refspec(remote, xstrdup(value));
 269        } else if (!strcmp(subkey, ".fetch")) {
 270                add_fetch_refspec(remote, xstrdup(value));
 271        } else if (!strcmp(subkey, ".receivepack")) {
 272                if (!remote->receivepack)
 273                        remote->receivepack = xstrdup(value);
 274                else
 275                        error("more than one receivepack given, using the first");
 276        } else if (!strcmp(subkey, ".uploadpack")) {
 277                if (!remote->uploadpack)
 278                        remote->uploadpack = xstrdup(value);
 279                else
 280                        error("more than one uploadpack given, using the first");
 281        } else if (!strcmp(subkey, ".tagopt")) {
 282                if (!strcmp(value, "--no-tags"))
 283                        remote->fetch_tags = -1;
 284        } else if (!strcmp(subkey, ".proxy")) {
 285                remote->http_proxy = xstrdup(value);
 286        }
 287        return 0;
 288}
 289
 290static void read_config(void)
 291{
 292        unsigned char sha1[20];
 293        const char *head_ref;
 294        int flag;
 295        if (default_remote_name) // did this already
 296                return;
 297        default_remote_name = xstrdup("origin");
 298        current_branch = NULL;
 299        head_ref = resolve_ref("HEAD", sha1, 0, &flag);
 300        if (head_ref && (flag & REF_ISSYMREF) &&
 301            !prefixcmp(head_ref, "refs/heads/")) {
 302                current_branch =
 303                        make_branch(head_ref + strlen("refs/heads/"), 0);
 304        }
 305        git_config(handle_config);
 306}
 307
 308struct refspec *parse_ref_spec(int nr_refspec, const char **refspec)
 309{
 310        int i;
 311        struct refspec *rs = xcalloc(sizeof(*rs), nr_refspec);
 312        for (i = 0; i < nr_refspec; i++) {
 313                const char *sp, *ep, *gp;
 314                sp = refspec[i];
 315                if (*sp == '+') {
 316                        rs[i].force = 1;
 317                        sp++;
 318                }
 319                gp = strchr(sp, '*');
 320                ep = strchr(sp, ':');
 321                if (gp && ep && gp > ep)
 322                        gp = NULL;
 323                if (ep) {
 324                        if (ep[1]) {
 325                                const char *glob = strchr(ep + 1, '*');
 326                                if (!glob)
 327                                        gp = NULL;
 328                                if (gp)
 329                                        rs[i].dst = xstrndup(ep + 1,
 330                                                             glob - ep - 1);
 331                                else
 332                                        rs[i].dst = xstrdup(ep + 1);
 333                        }
 334                } else {
 335                        ep = sp + strlen(sp);
 336                }
 337                if (gp) {
 338                        rs[i].pattern = 1;
 339                        ep = gp;
 340                }
 341                rs[i].src = xstrndup(sp, ep - sp);
 342        }
 343        return rs;
 344}
 345
 346static int valid_remote_nick(const char *name)
 347{
 348        if (!name[0] || /* not empty */
 349            (name[0] == '.' && /* not "." */
 350             (!name[1] || /* not ".." */
 351              (name[1] == '.' && !name[2]))))
 352                return 0;
 353        return !strchr(name, '/'); /* no slash */
 354}
 355
 356struct remote *remote_get(const char *name)
 357{
 358        struct remote *ret;
 359
 360        read_config();
 361        if (!name)
 362                name = default_remote_name;
 363        ret = make_remote(name, 0);
 364        if (valid_remote_nick(name)) {
 365                if (!ret->url)
 366                        read_remotes_file(ret);
 367                if (!ret->url)
 368                        read_branches_file(ret);
 369        }
 370        if (!ret->url)
 371                add_url(ret, name);
 372        if (!ret->url)
 373                return NULL;
 374        ret->fetch = parse_ref_spec(ret->fetch_refspec_nr, ret->fetch_refspec);
 375        ret->push = parse_ref_spec(ret->push_refspec_nr, ret->push_refspec);
 376        return ret;
 377}
 378
 379int for_each_remote(each_remote_fn fn, void *priv)
 380{
 381        int i, result = 0;
 382        read_config();
 383        for (i = 0; i < allocated_remotes && !result; i++) {
 384                struct remote *r = remotes[i];
 385                if (!r)
 386                        continue;
 387                if (!r->fetch)
 388                        r->fetch = parse_ref_spec(r->fetch_refspec_nr,
 389                                        r->fetch_refspec);
 390                if (!r->push)
 391                        r->push = parse_ref_spec(r->push_refspec_nr,
 392                                        r->push_refspec);
 393                result = fn(r, priv);
 394        }
 395        return result;
 396}
 397
 398void ref_remove_duplicates(struct ref *ref_map)
 399{
 400        struct ref **posn;
 401        struct ref *next;
 402        for (; ref_map; ref_map = ref_map->next) {
 403                if (!ref_map->peer_ref)
 404                        continue;
 405                posn = &ref_map->next;
 406                while (*posn) {
 407                        if ((*posn)->peer_ref &&
 408                            !strcmp((*posn)->peer_ref->name,
 409                                    ref_map->peer_ref->name)) {
 410                                if (strcmp((*posn)->name, ref_map->name))
 411                                        die("%s tracks both %s and %s",
 412                                            ref_map->peer_ref->name,
 413                                            (*posn)->name, ref_map->name);
 414                                next = (*posn)->next;
 415                                free((*posn)->peer_ref);
 416                                free(*posn);
 417                                *posn = next;
 418                        } else {
 419                                posn = &(*posn)->next;
 420                        }
 421                }
 422        }
 423}
 424
 425int remote_has_url(struct remote *remote, const char *url)
 426{
 427        int i;
 428        for (i = 0; i < remote->url_nr; i++) {
 429                if (!strcmp(remote->url[i], url))
 430                        return 1;
 431        }
 432        return 0;
 433}
 434
 435int remote_find_tracking(struct remote *remote, struct refspec *refspec)
 436{
 437        int find_src = refspec->src == NULL;
 438        char *needle, **result;
 439        int i;
 440
 441        if (find_src) {
 442                if (!refspec->dst)
 443                        return error("find_tracking: need either src or dst");
 444                needle = refspec->dst;
 445                result = &refspec->src;
 446        } else {
 447                needle = refspec->src;
 448                result = &refspec->dst;
 449        }
 450
 451        for (i = 0; i < remote->fetch_refspec_nr; i++) {
 452                struct refspec *fetch = &remote->fetch[i];
 453                const char *key = find_src ? fetch->dst : fetch->src;
 454                const char *value = find_src ? fetch->src : fetch->dst;
 455                if (!fetch->dst)
 456                        continue;
 457                if (fetch->pattern) {
 458                        if (!prefixcmp(needle, key)) {
 459                                *result = xmalloc(strlen(value) +
 460                                                  strlen(needle) -
 461                                                  strlen(key) + 1);
 462                                strcpy(*result, value);
 463                                strcpy(*result + strlen(value),
 464                                       needle + strlen(key));
 465                                refspec->force = fetch->force;
 466                                return 0;
 467                        }
 468                } else if (!strcmp(needle, key)) {
 469                        *result = xstrdup(value);
 470                        refspec->force = fetch->force;
 471                        return 0;
 472                }
 473        }
 474        return -1;
 475}
 476
 477struct ref *alloc_ref(unsigned namelen)
 478{
 479        struct ref *ret = xmalloc(sizeof(struct ref) + namelen);
 480        memset(ret, 0, sizeof(struct ref) + namelen);
 481        return ret;
 482}
 483
 484static struct ref *copy_ref(const struct ref *ref)
 485{
 486        struct ref *ret = xmalloc(sizeof(struct ref) + strlen(ref->name) + 1);
 487        memcpy(ret, ref, sizeof(struct ref) + strlen(ref->name) + 1);
 488        ret->next = NULL;
 489        return ret;
 490}
 491
 492struct ref *copy_ref_list(const struct ref *ref)
 493{
 494        struct ref *ret = NULL;
 495        struct ref **tail = &ret;
 496        while (ref) {
 497                *tail = copy_ref(ref);
 498                ref = ref->next;
 499                tail = &((*tail)->next);
 500        }
 501        return ret;
 502}
 503
 504void free_refs(struct ref *ref)
 505{
 506        struct ref *next;
 507        while (ref) {
 508                next = ref->next;
 509                if (ref->peer_ref)
 510                        free(ref->peer_ref);
 511                free(ref);
 512                ref = next;
 513        }
 514}
 515
 516static int count_refspec_match(const char *pattern,
 517                               struct ref *refs,
 518                               struct ref **matched_ref)
 519{
 520        int patlen = strlen(pattern);
 521        struct ref *matched_weak = NULL;
 522        struct ref *matched = NULL;
 523        int weak_match = 0;
 524        int match = 0;
 525
 526        for (weak_match = match = 0; refs; refs = refs->next) {
 527                char *name = refs->name;
 528                int namelen = strlen(name);
 529
 530                if (!refname_match(pattern, name, ref_rev_parse_rules))
 531                        continue;
 532
 533                /* A match is "weak" if it is with refs outside
 534                 * heads or tags, and did not specify the pattern
 535                 * in full (e.g. "refs/remotes/origin/master") or at
 536                 * least from the toplevel (e.g. "remotes/origin/master");
 537                 * otherwise "git push $URL master" would result in
 538                 * ambiguity between remotes/origin/master and heads/master
 539                 * at the remote site.
 540                 */
 541                if (namelen != patlen &&
 542                    patlen != namelen - 5 &&
 543                    prefixcmp(name, "refs/heads/") &&
 544                    prefixcmp(name, "refs/tags/")) {
 545                        /* We want to catch the case where only weak
 546                         * matches are found and there are multiple
 547                         * matches, and where more than one strong
 548                         * matches are found, as ambiguous.  One
 549                         * strong match with zero or more weak matches
 550                         * are acceptable as a unique match.
 551                         */
 552                        matched_weak = refs;
 553                        weak_match++;
 554                }
 555                else {
 556                        matched = refs;
 557                        match++;
 558                }
 559        }
 560        if (!matched) {
 561                *matched_ref = matched_weak;
 562                return weak_match;
 563        }
 564        else {
 565                *matched_ref = matched;
 566                return match;
 567        }
 568}
 569
 570static void tail_link_ref(struct ref *ref, struct ref ***tail)
 571{
 572        **tail = ref;
 573        while (ref->next)
 574                ref = ref->next;
 575        *tail = &ref->next;
 576}
 577
 578static struct ref *try_explicit_object_name(const char *name)
 579{
 580        unsigned char sha1[20];
 581        struct ref *ref;
 582        int len;
 583
 584        if (!*name) {
 585                ref = alloc_ref(20);
 586                strcpy(ref->name, "(delete)");
 587                hashclr(ref->new_sha1);
 588                return ref;
 589        }
 590        if (get_sha1(name, sha1))
 591                return NULL;
 592        len = strlen(name) + 1;
 593        ref = alloc_ref(len);
 594        memcpy(ref->name, name, len);
 595        hashcpy(ref->new_sha1, sha1);
 596        return ref;
 597}
 598
 599static struct ref *make_linked_ref(const char *name, struct ref ***tail)
 600{
 601        struct ref *ret;
 602        size_t len;
 603
 604        len = strlen(name) + 1;
 605        ret = alloc_ref(len);
 606        memcpy(ret->name, name, len);
 607        tail_link_ref(ret, tail);
 608        return ret;
 609}
 610
 611static int match_explicit(struct ref *src, struct ref *dst,
 612                          struct ref ***dst_tail,
 613                          struct refspec *rs,
 614                          int errs)
 615{
 616        struct ref *matched_src, *matched_dst;
 617
 618        const char *dst_value = rs->dst;
 619
 620        if (rs->pattern)
 621                return errs;
 622
 623        matched_src = matched_dst = NULL;
 624        switch (count_refspec_match(rs->src, src, &matched_src)) {
 625        case 1:
 626                break;
 627        case 0:
 628                /* The source could be in the get_sha1() format
 629                 * not a reference name.  :refs/other is a
 630                 * way to delete 'other' ref at the remote end.
 631                 */
 632                matched_src = try_explicit_object_name(rs->src);
 633                if (!matched_src)
 634                        error("src refspec %s does not match any.", rs->src);
 635                break;
 636        default:
 637                matched_src = NULL;
 638                error("src refspec %s matches more than one.", rs->src);
 639                break;
 640        }
 641
 642        if (!matched_src)
 643                errs = 1;
 644
 645        if (!dst_value) {
 646                if (!matched_src)
 647                        return errs;
 648                dst_value = matched_src->name;
 649        }
 650
 651        switch (count_refspec_match(dst_value, dst, &matched_dst)) {
 652        case 1:
 653                break;
 654        case 0:
 655                if (!memcmp(dst_value, "refs/", 5))
 656                        matched_dst = make_linked_ref(dst_value, dst_tail);
 657                else
 658                        error("dst refspec %s does not match any "
 659                              "existing ref on the remote and does "
 660                              "not start with refs/.", dst_value);
 661                break;
 662        default:
 663                matched_dst = NULL;
 664                error("dst refspec %s matches more than one.",
 665                      dst_value);
 666                break;
 667        }
 668        if (errs || !matched_dst)
 669                return 1;
 670        if (matched_dst->peer_ref) {
 671                errs = 1;
 672                error("dst ref %s receives from more than one src.",
 673                      matched_dst->name);
 674        }
 675        else {
 676                matched_dst->peer_ref = matched_src;
 677                matched_dst->force = rs->force;
 678        }
 679        return errs;
 680}
 681
 682static int match_explicit_refs(struct ref *src, struct ref *dst,
 683                               struct ref ***dst_tail, struct refspec *rs,
 684                               int rs_nr)
 685{
 686        int i, errs;
 687        for (i = errs = 0; i < rs_nr; i++)
 688                errs |= match_explicit(src, dst, dst_tail, &rs[i], errs);
 689        return -errs;
 690}
 691
 692static const struct refspec *check_pattern_match(const struct refspec *rs,
 693                                                 int rs_nr,
 694                                                 const struct ref *src)
 695{
 696        int i;
 697        for (i = 0; i < rs_nr; i++) {
 698                if (rs[i].pattern && !prefixcmp(src->name, rs[i].src))
 699                        return rs + i;
 700        }
 701        return NULL;
 702}
 703
 704/*
 705 * Note. This is used only by "push"; refspec matching rules for
 706 * push and fetch are subtly different, so do not try to reuse it
 707 * without thinking.
 708 */
 709int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
 710               int nr_refspec, const char **refspec, int flags)
 711{
 712        struct refspec *rs =
 713                parse_ref_spec(nr_refspec, (const char **) refspec);
 714        int send_all = flags & MATCH_REFS_ALL;
 715        int send_mirror = flags & MATCH_REFS_MIRROR;
 716
 717        if (match_explicit_refs(src, dst, dst_tail, rs, nr_refspec))
 718                return -1;
 719
 720        /* pick the remainder */
 721        for ( ; src; src = src->next) {
 722                struct ref *dst_peer;
 723                const struct refspec *pat = NULL;
 724                char *dst_name;
 725                if (src->peer_ref)
 726                        continue;
 727                if (nr_refspec) {
 728                        pat = check_pattern_match(rs, nr_refspec, src);
 729                        if (!pat)
 730                                continue;
 731                }
 732                else if (!send_mirror && prefixcmp(src->name, "refs/heads/"))
 733                        /*
 734                         * "matching refs"; traditionally we pushed everything
 735                         * including refs outside refs/heads/ hierarchy, but
 736                         * that does not make much sense these days.
 737                         */
 738                        continue;
 739
 740                if (pat) {
 741                        const char *dst_side = pat->dst ? pat->dst : pat->src;
 742                        dst_name = xmalloc(strlen(dst_side) +
 743                                           strlen(src->name) -
 744                                           strlen(pat->src) + 2);
 745                        strcpy(dst_name, dst_side);
 746                        strcat(dst_name, src->name + strlen(pat->src));
 747                } else
 748                        dst_name = xstrdup(src->name);
 749                dst_peer = find_ref_by_name(dst, dst_name);
 750                if (dst_peer && dst_peer->peer_ref)
 751                        /* We're already sending something to this ref. */
 752                        goto free_name;
 753
 754                if (!dst_peer && !nr_refspec && !(send_all || send_mirror))
 755                        /*
 756                         * Remote doesn't have it, and we have no
 757                         * explicit pattern, and we don't have
 758                         * --all nor --mirror.
 759                         */
 760                        goto free_name;
 761                if (!dst_peer) {
 762                        /* Create a new one and link it */
 763                        dst_peer = make_linked_ref(dst_name, dst_tail);
 764                        hashcpy(dst_peer->new_sha1, src->new_sha1);
 765                }
 766                dst_peer->peer_ref = src;
 767                if (pat)
 768                        dst_peer->force = pat->force;
 769        free_name:
 770                free(dst_name);
 771        }
 772        return 0;
 773}
 774
 775struct branch *branch_get(const char *name)
 776{
 777        struct branch *ret;
 778
 779        read_config();
 780        if (!name || !*name || !strcmp(name, "HEAD"))
 781                ret = current_branch;
 782        else
 783                ret = make_branch(name, 0);
 784        if (ret && ret->remote_name) {
 785                ret->remote = remote_get(ret->remote_name);
 786                if (ret->merge_nr) {
 787                        int i;
 788                        ret->merge = xcalloc(sizeof(*ret->merge),
 789                                             ret->merge_nr);
 790                        for (i = 0; i < ret->merge_nr; i++) {
 791                                ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
 792                                ret->merge[i]->src = xstrdup(ret->merge_name[i]);
 793                                remote_find_tracking(ret->remote,
 794                                                     ret->merge[i]);
 795                        }
 796                }
 797        }
 798        return ret;
 799}
 800
 801int branch_has_merge_config(struct branch *branch)
 802{
 803        return branch && !!branch->merge;
 804}
 805
 806int branch_merge_matches(struct branch *branch,
 807                                 int i,
 808                                 const char *refname)
 809{
 810        if (!branch || i < 0 || i >= branch->merge_nr)
 811                return 0;
 812        return refname_match(branch->merge[i]->src, refname, ref_fetch_rules);
 813}
 814
 815static struct ref *get_expanded_map(const struct ref *remote_refs,
 816                                    const struct refspec *refspec)
 817{
 818        const struct ref *ref;
 819        struct ref *ret = NULL;
 820        struct ref **tail = &ret;
 821
 822        int remote_prefix_len = strlen(refspec->src);
 823        int local_prefix_len = strlen(refspec->dst);
 824
 825        for (ref = remote_refs; ref; ref = ref->next) {
 826                if (strchr(ref->name, '^'))
 827                        continue; /* a dereference item */
 828                if (!prefixcmp(ref->name, refspec->src)) {
 829                        const char *match;
 830                        struct ref *cpy = copy_ref(ref);
 831                        match = ref->name + remote_prefix_len;
 832
 833                        cpy->peer_ref = alloc_ref(local_prefix_len +
 834                                                  strlen(match) + 1);
 835                        sprintf(cpy->peer_ref->name, "%s%s",
 836                                refspec->dst, match);
 837                        if (refspec->force)
 838                                cpy->peer_ref->force = 1;
 839                        *tail = cpy;
 840                        tail = &cpy->next;
 841                }
 842        }
 843
 844        return ret;
 845}
 846
 847static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
 848{
 849        const struct ref *ref;
 850        for (ref = refs; ref; ref = ref->next) {
 851                if (refname_match(name, ref->name, ref_fetch_rules))
 852                        return ref;
 853        }
 854        return NULL;
 855}
 856
 857struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
 858{
 859        const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
 860
 861        if (!ref)
 862                return NULL;
 863
 864        return copy_ref(ref);
 865}
 866
 867static struct ref *get_local_ref(const char *name)
 868{
 869        struct ref *ret;
 870        if (!name)
 871                return NULL;
 872
 873        if (!prefixcmp(name, "refs/")) {
 874                ret = alloc_ref(strlen(name) + 1);
 875                strcpy(ret->name, name);
 876                return ret;
 877        }
 878
 879        if (!prefixcmp(name, "heads/") ||
 880            !prefixcmp(name, "tags/") ||
 881            !prefixcmp(name, "remotes/")) {
 882                ret = alloc_ref(strlen(name) + 6);
 883                sprintf(ret->name, "refs/%s", name);
 884                return ret;
 885        }
 886
 887        ret = alloc_ref(strlen(name) + 12);
 888        sprintf(ret->name, "refs/heads/%s", name);
 889        return ret;
 890}
 891
 892int get_fetch_map(const struct ref *remote_refs,
 893                  const struct refspec *refspec,
 894                  struct ref ***tail,
 895                  int missing_ok)
 896{
 897        struct ref *ref_map, *rm;
 898
 899        if (refspec->pattern) {
 900                ref_map = get_expanded_map(remote_refs, refspec);
 901        } else {
 902                const char *name = refspec->src[0] ? refspec->src : "HEAD";
 903
 904                ref_map = get_remote_ref(remote_refs, name);
 905                if (!missing_ok && !ref_map)
 906                        die("Couldn't find remote ref %s", name);
 907                if (ref_map) {
 908                        ref_map->peer_ref = get_local_ref(refspec->dst);
 909                        if (ref_map->peer_ref && refspec->force)
 910                                ref_map->peer_ref->force = 1;
 911                }
 912        }
 913
 914        for (rm = ref_map; rm; rm = rm->next) {
 915                if (rm->peer_ref && check_ref_format(rm->peer_ref->name + 5))
 916                        die("* refusing to create funny ref '%s' locally",
 917                            rm->peer_ref->name);
 918        }
 919
 920        if (ref_map)
 921                tail_link_ref(ref_map, tail);
 922
 923        return 0;
 924}