remote.con commit url rewriting: take longest and first match (844112c)
   1#include "cache.h"
   2#include "remote.h"
   3#include "refs.h"
   4
   5struct counted_string {
   6        size_t len;
   7        const char *s;
   8};
   9struct rewrite {
  10        const char *base;
  11        size_t baselen;
  12        struct counted_string *instead_of;
  13        int instead_of_nr;
  14        int instead_of_alloc;
  15};
  16
  17static struct remote **remotes;
  18static int remotes_alloc;
  19static int remotes_nr;
  20
  21static struct branch **branches;
  22static int branches_alloc;
  23static int branches_nr;
  24
  25static struct branch *current_branch;
  26static const char *default_remote_name;
  27
  28static struct rewrite **rewrite;
  29static int rewrite_alloc;
  30static int rewrite_nr;
  31
  32#define BUF_SIZE (2048)
  33static char buffer[BUF_SIZE];
  34
  35static const char *alias_url(const char *url)
  36{
  37        int i, j;
  38        char *ret;
  39        struct counted_string *longest;
  40        int longest_i;
  41
  42        longest = NULL;
  43        longest_i = -1;
  44        for (i = 0; i < rewrite_nr; i++) {
  45                if (!rewrite[i])
  46                        continue;
  47                for (j = 0; j < rewrite[i]->instead_of_nr; j++) {
  48                        if (!prefixcmp(url, rewrite[i]->instead_of[j].s) &&
  49                            (!longest ||
  50                             longest->len < rewrite[i]->instead_of[j].len)) {
  51                                longest = &(rewrite[i]->instead_of[j]);
  52                                longest_i = i;
  53                        }
  54                }
  55        }
  56        if (!longest)
  57                return url;
  58
  59        ret = malloc(rewrite[longest_i]->baselen +
  60                     (strlen(url) - longest->len) + 1);
  61        strcpy(ret, rewrite[longest_i]->base);
  62        strcpy(ret + rewrite[longest_i]->baselen, url + longest->len);
  63        return ret;
  64}
  65
  66static void add_push_refspec(struct remote *remote, const char *ref)
  67{
  68        ALLOC_GROW(remote->push_refspec,
  69                   remote->push_refspec_nr + 1,
  70                   remote->push_refspec_alloc);
  71        remote->push_refspec[remote->push_refspec_nr++] = ref;
  72}
  73
  74static void add_fetch_refspec(struct remote *remote, const char *ref)
  75{
  76        ALLOC_GROW(remote->fetch_refspec,
  77                   remote->fetch_refspec_nr + 1,
  78                   remote->fetch_refspec_alloc);
  79        remote->fetch_refspec[remote->fetch_refspec_nr++] = ref;
  80}
  81
  82static void add_url(struct remote *remote, const char *url)
  83{
  84        ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
  85        remote->url[remote->url_nr++] = url;
  86}
  87
  88static void add_url_alias(struct remote *remote, const char *url)
  89{
  90        add_url(remote, alias_url(url));
  91}
  92
  93static struct remote *make_remote(const char *name, int len)
  94{
  95        struct remote *ret;
  96        int i;
  97
  98        for (i = 0; i < remotes_nr; i++) {
  99                if (len ? (!strncmp(name, remotes[i]->name, len) &&
 100                           !remotes[i]->name[len]) :
 101                    !strcmp(name, remotes[i]->name))
 102                        return remotes[i];
 103        }
 104
 105        ret = xcalloc(1, sizeof(struct remote));
 106        ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
 107        remotes[remotes_nr++] = ret;
 108        if (len)
 109                ret->name = xstrndup(name, len);
 110        else
 111                ret->name = xstrdup(name);
 112        return ret;
 113}
 114
 115static void add_merge(struct branch *branch, const char *name)
 116{
 117        ALLOC_GROW(branch->merge_name, branch->merge_nr + 1,
 118                   branch->merge_alloc);
 119        branch->merge_name[branch->merge_nr++] = name;
 120}
 121
 122static struct branch *make_branch(const char *name, int len)
 123{
 124        struct branch *ret;
 125        int i;
 126        char *refname;
 127
 128        for (i = 0; i < branches_nr; i++) {
 129                if (len ? (!strncmp(name, branches[i]->name, len) &&
 130                           !branches[i]->name[len]) :
 131                    !strcmp(name, branches[i]->name))
 132                        return branches[i];
 133        }
 134
 135        ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
 136        ret = xcalloc(1, sizeof(struct branch));
 137        branches[branches_nr++] = ret;
 138        if (len)
 139                ret->name = xstrndup(name, len);
 140        else
 141                ret->name = xstrdup(name);
 142        refname = malloc(strlen(name) + strlen("refs/heads/") + 1);
 143        strcpy(refname, "refs/heads/");
 144        strcpy(refname + strlen("refs/heads/"), ret->name);
 145        ret->refname = refname;
 146
 147        return ret;
 148}
 149
 150static struct rewrite *make_rewrite(const char *base, int len)
 151{
 152        struct rewrite *ret;
 153        int i;
 154
 155        for (i = 0; i < rewrite_nr; i++) {
 156                if (len
 157                    ? (len == rewrite[i]->baselen &&
 158                       !strncmp(base, rewrite[i]->base, len))
 159                    : !strcmp(base, rewrite[i]->base))
 160                        return rewrite[i];
 161        }
 162
 163        ALLOC_GROW(rewrite, rewrite_nr + 1, rewrite_alloc);
 164        ret = xcalloc(1, sizeof(struct rewrite));
 165        rewrite[rewrite_nr++] = ret;
 166        if (len) {
 167                ret->base = xstrndup(base, len);
 168                ret->baselen = len;
 169        }
 170        else {
 171                ret->base = xstrdup(base);
 172                ret->baselen = strlen(base);
 173        }
 174        return ret;
 175}
 176
 177static void add_instead_of(struct rewrite *rewrite, const char *instead_of)
 178{
 179        ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
 180        rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
 181        rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
 182        rewrite->instead_of_nr++;
 183}
 184
 185static void read_remotes_file(struct remote *remote)
 186{
 187        FILE *f = fopen(git_path("remotes/%s", remote->name), "r");
 188
 189        if (!f)
 190                return;
 191        while (fgets(buffer, BUF_SIZE, f)) {
 192                int value_list;
 193                char *s, *p;
 194
 195                if (!prefixcmp(buffer, "URL:")) {
 196                        value_list = 0;
 197                        s = buffer + 4;
 198                } else if (!prefixcmp(buffer, "Push:")) {
 199                        value_list = 1;
 200                        s = buffer + 5;
 201                } else if (!prefixcmp(buffer, "Pull:")) {
 202                        value_list = 2;
 203                        s = buffer + 5;
 204                } else
 205                        continue;
 206
 207                while (isspace(*s))
 208                        s++;
 209                if (!*s)
 210                        continue;
 211
 212                p = s + strlen(s);
 213                while (isspace(p[-1]))
 214                        *--p = 0;
 215
 216                switch (value_list) {
 217                case 0:
 218                        add_url_alias(remote, xstrdup(s));
 219                        break;
 220                case 1:
 221                        add_push_refspec(remote, xstrdup(s));
 222                        break;
 223                case 2:
 224                        add_fetch_refspec(remote, xstrdup(s));
 225                        break;
 226                }
 227        }
 228        fclose(f);
 229}
 230
 231static void read_branches_file(struct remote *remote)
 232{
 233        const char *slash = strchr(remote->name, '/');
 234        char *frag;
 235        char *branch;
 236        int n = slash ? slash - remote->name : 1000;
 237        FILE *f = fopen(git_path("branches/%.*s", n, remote->name), "r");
 238        char *s, *p;
 239        int len;
 240
 241        if (!f)
 242                return;
 243        s = fgets(buffer, BUF_SIZE, f);
 244        fclose(f);
 245        if (!s)
 246                return;
 247        while (isspace(*s))
 248                s++;
 249        if (!*s)
 250                return;
 251        p = s + strlen(s);
 252        while (isspace(p[-1]))
 253                *--p = 0;
 254        len = p - s;
 255        if (slash)
 256                len += strlen(slash);
 257        p = xmalloc(len + 1);
 258        strcpy(p, s);
 259        if (slash)
 260                strcat(p, slash);
 261        frag = strchr(p, '#');
 262        if (frag) {
 263                *(frag++) = '\0';
 264                branch = xmalloc(strlen(frag) + 12);
 265                strcpy(branch, "refs/heads/");
 266                strcat(branch, frag);
 267        } else {
 268                branch = "refs/heads/master";
 269        }
 270        add_url_alias(remote, p);
 271        add_fetch_refspec(remote, branch);
 272        remote->fetch_tags = 1; /* always auto-follow */
 273}
 274
 275static int handle_config(const char *key, const char *value)
 276{
 277        const char *name;
 278        const char *subkey;
 279        struct remote *remote;
 280        struct branch *branch;
 281        if (!prefixcmp(key, "branch.")) {
 282                name = key + 7;
 283                subkey = strrchr(name, '.');
 284                if (!subkey)
 285                        return 0;
 286                branch = make_branch(name, subkey - name);
 287                if (!strcmp(subkey, ".remote")) {
 288                        if (!value)
 289                                return config_error_nonbool(key);
 290                        branch->remote_name = xstrdup(value);
 291                        if (branch == current_branch)
 292                                default_remote_name = branch->remote_name;
 293                } else if (!strcmp(subkey, ".merge")) {
 294                        if (!value)
 295                                return config_error_nonbool(key);
 296                        add_merge(branch, xstrdup(value));
 297                }
 298                return 0;
 299        }
 300        if (!prefixcmp(key, "url.")) {
 301                struct rewrite *rewrite;
 302                name = key + 5;
 303                subkey = strrchr(name, '.');
 304                if (!subkey)
 305                        return 0;
 306                rewrite = make_rewrite(name, subkey - name);
 307                if (!strcmp(subkey, ".insteadof")) {
 308                        if (!value)
 309                                return config_error_nonbool(key);
 310                        add_instead_of(rewrite, xstrdup(value));
 311                }
 312        }
 313        if (prefixcmp(key,  "remote."))
 314                return 0;
 315        name = key + 7;
 316        subkey = strrchr(name, '.');
 317        if (!subkey)
 318                return error("Config with no key for remote %s", name);
 319        if (*subkey == '/') {
 320                warning("Config remote shorthand cannot begin with '/': %s", name);
 321                return 0;
 322        }
 323        remote = make_remote(name, subkey - name);
 324        if (!value) {
 325                /* if we ever have a boolean variable, e.g. "remote.*.disabled"
 326                 * [remote "frotz"]
 327                 *      disabled
 328                 * is a valid way to set it to true; we get NULL in value so
 329                 * we need to handle it here.
 330                 *
 331                 * if (!strcmp(subkey, ".disabled")) {
 332                 *      val = git_config_bool(key, value);
 333                 *      return 0;
 334                 * } else
 335                 *
 336                 */
 337                return 0; /* ignore unknown booleans */
 338        }
 339        if (!strcmp(subkey, ".url")) {
 340                add_url(remote, xstrdup(value));
 341        } else if (!strcmp(subkey, ".push")) {
 342                add_push_refspec(remote, xstrdup(value));
 343        } else if (!strcmp(subkey, ".fetch")) {
 344                add_fetch_refspec(remote, xstrdup(value));
 345        } else if (!strcmp(subkey, ".receivepack")) {
 346                if (!remote->receivepack)
 347                        remote->receivepack = xstrdup(value);
 348                else
 349                        error("more than one receivepack given, using the first");
 350        } else if (!strcmp(subkey, ".uploadpack")) {
 351                if (!remote->uploadpack)
 352                        remote->uploadpack = xstrdup(value);
 353                else
 354                        error("more than one uploadpack given, using the first");
 355        } else if (!strcmp(subkey, ".tagopt")) {
 356                if (!strcmp(value, "--no-tags"))
 357                        remote->fetch_tags = -1;
 358        } else if (!strcmp(subkey, ".proxy")) {
 359                remote->http_proxy = xstrdup(value);
 360        }
 361        return 0;
 362}
 363
 364static void alias_all_urls(void)
 365{
 366        int i, j;
 367        for (i = 0; i < remotes_nr; i++) {
 368                if (!remotes[i])
 369                        continue;
 370                for (j = 0; j < remotes[i]->url_nr; j++) {
 371                        remotes[i]->url[j] = alias_url(remotes[i]->url[j]);
 372                }
 373        }
 374}
 375
 376static void read_config(void)
 377{
 378        unsigned char sha1[20];
 379        const char *head_ref;
 380        int flag;
 381        if (default_remote_name) // did this already
 382                return;
 383        default_remote_name = xstrdup("origin");
 384        current_branch = NULL;
 385        head_ref = resolve_ref("HEAD", sha1, 0, &flag);
 386        if (head_ref && (flag & REF_ISSYMREF) &&
 387            !prefixcmp(head_ref, "refs/heads/")) {
 388                current_branch =
 389                        make_branch(head_ref + strlen("refs/heads/"), 0);
 390        }
 391        git_config(handle_config);
 392        alias_all_urls();
 393}
 394
 395struct refspec *parse_ref_spec(int nr_refspec, const char **refspec)
 396{
 397        int i;
 398        struct refspec *rs = xcalloc(sizeof(*rs), nr_refspec);
 399        for (i = 0; i < nr_refspec; i++) {
 400                const char *sp, *ep, *gp;
 401                sp = refspec[i];
 402                if (*sp == '+') {
 403                        rs[i].force = 1;
 404                        sp++;
 405                }
 406                gp = strchr(sp, '*');
 407                ep = strchr(sp, ':');
 408                if (gp && ep && gp > ep)
 409                        gp = NULL;
 410                if (ep) {
 411                        if (ep[1]) {
 412                                const char *glob = strchr(ep + 1, '*');
 413                                if (!glob)
 414                                        gp = NULL;
 415                                if (gp)
 416                                        rs[i].dst = xstrndup(ep + 1,
 417                                                             glob - ep - 1);
 418                                else
 419                                        rs[i].dst = xstrdup(ep + 1);
 420                        }
 421                } else {
 422                        ep = sp + strlen(sp);
 423                }
 424                if (gp) {
 425                        rs[i].pattern = 1;
 426                        ep = gp;
 427                }
 428                rs[i].src = xstrndup(sp, ep - sp);
 429        }
 430        return rs;
 431}
 432
 433static int valid_remote_nick(const char *name)
 434{
 435        if (!name[0] || /* not empty */
 436            (name[0] == '.' && /* not "." */
 437             (!name[1] || /* not ".." */
 438              (name[1] == '.' && !name[2]))))
 439                return 0;
 440        return !strchr(name, '/'); /* no slash */
 441}
 442
 443struct remote *remote_get(const char *name)
 444{
 445        struct remote *ret;
 446
 447        read_config();
 448        if (!name)
 449                name = default_remote_name;
 450        ret = make_remote(name, 0);
 451        if (valid_remote_nick(name)) {
 452                if (!ret->url)
 453                        read_remotes_file(ret);
 454                if (!ret->url)
 455                        read_branches_file(ret);
 456        }
 457        if (!ret->url)
 458                add_url_alias(ret, name);
 459        if (!ret->url)
 460                return NULL;
 461        ret->fetch = parse_ref_spec(ret->fetch_refspec_nr, ret->fetch_refspec);
 462        ret->push = parse_ref_spec(ret->push_refspec_nr, ret->push_refspec);
 463        return ret;
 464}
 465
 466int for_each_remote(each_remote_fn fn, void *priv)
 467{
 468        int i, result = 0;
 469        read_config();
 470        for (i = 0; i < remotes_nr && !result; i++) {
 471                struct remote *r = remotes[i];
 472                if (!r)
 473                        continue;
 474                if (!r->fetch)
 475                        r->fetch = parse_ref_spec(r->fetch_refspec_nr,
 476                                        r->fetch_refspec);
 477                if (!r->push)
 478                        r->push = parse_ref_spec(r->push_refspec_nr,
 479                                        r->push_refspec);
 480                result = fn(r, priv);
 481        }
 482        return result;
 483}
 484
 485void ref_remove_duplicates(struct ref *ref_map)
 486{
 487        struct ref **posn;
 488        struct ref *next;
 489        for (; ref_map; ref_map = ref_map->next) {
 490                if (!ref_map->peer_ref)
 491                        continue;
 492                posn = &ref_map->next;
 493                while (*posn) {
 494                        if ((*posn)->peer_ref &&
 495                            !strcmp((*posn)->peer_ref->name,
 496                                    ref_map->peer_ref->name)) {
 497                                if (strcmp((*posn)->name, ref_map->name))
 498                                        die("%s tracks both %s and %s",
 499                                            ref_map->peer_ref->name,
 500                                            (*posn)->name, ref_map->name);
 501                                next = (*posn)->next;
 502                                free((*posn)->peer_ref);
 503                                free(*posn);
 504                                *posn = next;
 505                        } else {
 506                                posn = &(*posn)->next;
 507                        }
 508                }
 509        }
 510}
 511
 512int remote_has_url(struct remote *remote, const char *url)
 513{
 514        int i;
 515        for (i = 0; i < remote->url_nr; i++) {
 516                if (!strcmp(remote->url[i], url))
 517                        return 1;
 518        }
 519        return 0;
 520}
 521
 522int remote_find_tracking(struct remote *remote, struct refspec *refspec)
 523{
 524        int find_src = refspec->src == NULL;
 525        char *needle, **result;
 526        int i;
 527
 528        if (find_src) {
 529                if (!refspec->dst)
 530                        return error("find_tracking: need either src or dst");
 531                needle = refspec->dst;
 532                result = &refspec->src;
 533        } else {
 534                needle = refspec->src;
 535                result = &refspec->dst;
 536        }
 537
 538        for (i = 0; i < remote->fetch_refspec_nr; i++) {
 539                struct refspec *fetch = &remote->fetch[i];
 540                const char *key = find_src ? fetch->dst : fetch->src;
 541                const char *value = find_src ? fetch->src : fetch->dst;
 542                if (!fetch->dst)
 543                        continue;
 544                if (fetch->pattern) {
 545                        if (!prefixcmp(needle, key)) {
 546                                *result = xmalloc(strlen(value) +
 547                                                  strlen(needle) -
 548                                                  strlen(key) + 1);
 549                                strcpy(*result, value);
 550                                strcpy(*result + strlen(value),
 551                                       needle + strlen(key));
 552                                refspec->force = fetch->force;
 553                                return 0;
 554                        }
 555                } else if (!strcmp(needle, key)) {
 556                        *result = xstrdup(value);
 557                        refspec->force = fetch->force;
 558                        return 0;
 559                }
 560        }
 561        return -1;
 562}
 563
 564struct ref *alloc_ref(unsigned namelen)
 565{
 566        struct ref *ret = xmalloc(sizeof(struct ref) + namelen);
 567        memset(ret, 0, sizeof(struct ref) + namelen);
 568        return ret;
 569}
 570
 571static struct ref *copy_ref(const struct ref *ref)
 572{
 573        struct ref *ret = xmalloc(sizeof(struct ref) + strlen(ref->name) + 1);
 574        memcpy(ret, ref, sizeof(struct ref) + strlen(ref->name) + 1);
 575        ret->next = NULL;
 576        return ret;
 577}
 578
 579struct ref *copy_ref_list(const struct ref *ref)
 580{
 581        struct ref *ret = NULL;
 582        struct ref **tail = &ret;
 583        while (ref) {
 584                *tail = copy_ref(ref);
 585                ref = ref->next;
 586                tail = &((*tail)->next);
 587        }
 588        return ret;
 589}
 590
 591void free_refs(struct ref *ref)
 592{
 593        struct ref *next;
 594        while (ref) {
 595                next = ref->next;
 596                if (ref->peer_ref)
 597                        free(ref->peer_ref);
 598                free(ref);
 599                ref = next;
 600        }
 601}
 602
 603static int count_refspec_match(const char *pattern,
 604                               struct ref *refs,
 605                               struct ref **matched_ref)
 606{
 607        int patlen = strlen(pattern);
 608        struct ref *matched_weak = NULL;
 609        struct ref *matched = NULL;
 610        int weak_match = 0;
 611        int match = 0;
 612
 613        for (weak_match = match = 0; refs; refs = refs->next) {
 614                char *name = refs->name;
 615                int namelen = strlen(name);
 616
 617                if (!refname_match(pattern, name, ref_rev_parse_rules))
 618                        continue;
 619
 620                /* A match is "weak" if it is with refs outside
 621                 * heads or tags, and did not specify the pattern
 622                 * in full (e.g. "refs/remotes/origin/master") or at
 623                 * least from the toplevel (e.g. "remotes/origin/master");
 624                 * otherwise "git push $URL master" would result in
 625                 * ambiguity between remotes/origin/master and heads/master
 626                 * at the remote site.
 627                 */
 628                if (namelen != patlen &&
 629                    patlen != namelen - 5 &&
 630                    prefixcmp(name, "refs/heads/") &&
 631                    prefixcmp(name, "refs/tags/")) {
 632                        /* We want to catch the case where only weak
 633                         * matches are found and there are multiple
 634                         * matches, and where more than one strong
 635                         * matches are found, as ambiguous.  One
 636                         * strong match with zero or more weak matches
 637                         * are acceptable as a unique match.
 638                         */
 639                        matched_weak = refs;
 640                        weak_match++;
 641                }
 642                else {
 643                        matched = refs;
 644                        match++;
 645                }
 646        }
 647        if (!matched) {
 648                *matched_ref = matched_weak;
 649                return weak_match;
 650        }
 651        else {
 652                *matched_ref = matched;
 653                return match;
 654        }
 655}
 656
 657static void tail_link_ref(struct ref *ref, struct ref ***tail)
 658{
 659        **tail = ref;
 660        while (ref->next)
 661                ref = ref->next;
 662        *tail = &ref->next;
 663}
 664
 665static struct ref *try_explicit_object_name(const char *name)
 666{
 667        unsigned char sha1[20];
 668        struct ref *ref;
 669        int len;
 670
 671        if (!*name) {
 672                ref = alloc_ref(20);
 673                strcpy(ref->name, "(delete)");
 674                hashclr(ref->new_sha1);
 675                return ref;
 676        }
 677        if (get_sha1(name, sha1))
 678                return NULL;
 679        len = strlen(name) + 1;
 680        ref = alloc_ref(len);
 681        memcpy(ref->name, name, len);
 682        hashcpy(ref->new_sha1, sha1);
 683        return ref;
 684}
 685
 686static struct ref *make_linked_ref(const char *name, struct ref ***tail)
 687{
 688        struct ref *ret;
 689        size_t len;
 690
 691        len = strlen(name) + 1;
 692        ret = alloc_ref(len);
 693        memcpy(ret->name, name, len);
 694        tail_link_ref(ret, tail);
 695        return ret;
 696}
 697
 698static int match_explicit(struct ref *src, struct ref *dst,
 699                          struct ref ***dst_tail,
 700                          struct refspec *rs,
 701                          int errs)
 702{
 703        struct ref *matched_src, *matched_dst;
 704
 705        const char *dst_value = rs->dst;
 706
 707        if (rs->pattern)
 708                return errs;
 709
 710        matched_src = matched_dst = NULL;
 711        switch (count_refspec_match(rs->src, src, &matched_src)) {
 712        case 1:
 713                break;
 714        case 0:
 715                /* The source could be in the get_sha1() format
 716                 * not a reference name.  :refs/other is a
 717                 * way to delete 'other' ref at the remote end.
 718                 */
 719                matched_src = try_explicit_object_name(rs->src);
 720                if (!matched_src)
 721                        error("src refspec %s does not match any.", rs->src);
 722                break;
 723        default:
 724                matched_src = NULL;
 725                error("src refspec %s matches more than one.", rs->src);
 726                break;
 727        }
 728
 729        if (!matched_src)
 730                errs = 1;
 731
 732        if (!dst_value) {
 733                if (!matched_src)
 734                        return errs;
 735                dst_value = matched_src->name;
 736        }
 737
 738        switch (count_refspec_match(dst_value, dst, &matched_dst)) {
 739        case 1:
 740                break;
 741        case 0:
 742                if (!memcmp(dst_value, "refs/", 5))
 743                        matched_dst = make_linked_ref(dst_value, dst_tail);
 744                else
 745                        error("dst refspec %s does not match any "
 746                              "existing ref on the remote and does "
 747                              "not start with refs/.", dst_value);
 748                break;
 749        default:
 750                matched_dst = NULL;
 751                error("dst refspec %s matches more than one.",
 752                      dst_value);
 753                break;
 754        }
 755        if (errs || !matched_dst)
 756                return 1;
 757        if (matched_dst->peer_ref) {
 758                errs = 1;
 759                error("dst ref %s receives from more than one src.",
 760                      matched_dst->name);
 761        }
 762        else {
 763                matched_dst->peer_ref = matched_src;
 764                matched_dst->force = rs->force;
 765        }
 766        return errs;
 767}
 768
 769static int match_explicit_refs(struct ref *src, struct ref *dst,
 770                               struct ref ***dst_tail, struct refspec *rs,
 771                               int rs_nr)
 772{
 773        int i, errs;
 774        for (i = errs = 0; i < rs_nr; i++)
 775                errs |= match_explicit(src, dst, dst_tail, &rs[i], errs);
 776        return -errs;
 777}
 778
 779static const struct refspec *check_pattern_match(const struct refspec *rs,
 780                                                 int rs_nr,
 781                                                 const struct ref *src)
 782{
 783        int i;
 784        for (i = 0; i < rs_nr; i++) {
 785                if (rs[i].pattern && !prefixcmp(src->name, rs[i].src))
 786                        return rs + i;
 787        }
 788        return NULL;
 789}
 790
 791/*
 792 * Note. This is used only by "push"; refspec matching rules for
 793 * push and fetch are subtly different, so do not try to reuse it
 794 * without thinking.
 795 */
 796int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
 797               int nr_refspec, const char **refspec, int flags)
 798{
 799        struct refspec *rs =
 800                parse_ref_spec(nr_refspec, (const char **) refspec);
 801        int send_all = flags & MATCH_REFS_ALL;
 802        int send_mirror = flags & MATCH_REFS_MIRROR;
 803
 804        if (match_explicit_refs(src, dst, dst_tail, rs, nr_refspec))
 805                return -1;
 806
 807        /* pick the remainder */
 808        for ( ; src; src = src->next) {
 809                struct ref *dst_peer;
 810                const struct refspec *pat = NULL;
 811                char *dst_name;
 812                if (src->peer_ref)
 813                        continue;
 814                if (nr_refspec) {
 815                        pat = check_pattern_match(rs, nr_refspec, src);
 816                        if (!pat)
 817                                continue;
 818                }
 819                else if (!send_mirror && prefixcmp(src->name, "refs/heads/"))
 820                        /*
 821                         * "matching refs"; traditionally we pushed everything
 822                         * including refs outside refs/heads/ hierarchy, but
 823                         * that does not make much sense these days.
 824                         */
 825                        continue;
 826
 827                if (pat) {
 828                        const char *dst_side = pat->dst ? pat->dst : pat->src;
 829                        dst_name = xmalloc(strlen(dst_side) +
 830                                           strlen(src->name) -
 831                                           strlen(pat->src) + 2);
 832                        strcpy(dst_name, dst_side);
 833                        strcat(dst_name, src->name + strlen(pat->src));
 834                } else
 835                        dst_name = xstrdup(src->name);
 836                dst_peer = find_ref_by_name(dst, dst_name);
 837                if (dst_peer && dst_peer->peer_ref)
 838                        /* We're already sending something to this ref. */
 839                        goto free_name;
 840
 841                if (!dst_peer && !nr_refspec && !(send_all || send_mirror))
 842                        /*
 843                         * Remote doesn't have it, and we have no
 844                         * explicit pattern, and we don't have
 845                         * --all nor --mirror.
 846                         */
 847                        goto free_name;
 848                if (!dst_peer) {
 849                        /* Create a new one and link it */
 850                        dst_peer = make_linked_ref(dst_name, dst_tail);
 851                        hashcpy(dst_peer->new_sha1, src->new_sha1);
 852                }
 853                dst_peer->peer_ref = src;
 854                if (pat)
 855                        dst_peer->force = pat->force;
 856        free_name:
 857                free(dst_name);
 858        }
 859        return 0;
 860}
 861
 862struct branch *branch_get(const char *name)
 863{
 864        struct branch *ret;
 865
 866        read_config();
 867        if (!name || !*name || !strcmp(name, "HEAD"))
 868                ret = current_branch;
 869        else
 870                ret = make_branch(name, 0);
 871        if (ret && ret->remote_name) {
 872                ret->remote = remote_get(ret->remote_name);
 873                if (ret->merge_nr) {
 874                        int i;
 875                        ret->merge = xcalloc(sizeof(*ret->merge),
 876                                             ret->merge_nr);
 877                        for (i = 0; i < ret->merge_nr; i++) {
 878                                ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
 879                                ret->merge[i]->src = xstrdup(ret->merge_name[i]);
 880                                remote_find_tracking(ret->remote,
 881                                                     ret->merge[i]);
 882                        }
 883                }
 884        }
 885        return ret;
 886}
 887
 888int branch_has_merge_config(struct branch *branch)
 889{
 890        return branch && !!branch->merge;
 891}
 892
 893int branch_merge_matches(struct branch *branch,
 894                                 int i,
 895                                 const char *refname)
 896{
 897        if (!branch || i < 0 || i >= branch->merge_nr)
 898                return 0;
 899        return refname_match(branch->merge[i]->src, refname, ref_fetch_rules);
 900}
 901
 902static struct ref *get_expanded_map(const struct ref *remote_refs,
 903                                    const struct refspec *refspec)
 904{
 905        const struct ref *ref;
 906        struct ref *ret = NULL;
 907        struct ref **tail = &ret;
 908
 909        int remote_prefix_len = strlen(refspec->src);
 910        int local_prefix_len = strlen(refspec->dst);
 911
 912        for (ref = remote_refs; ref; ref = ref->next) {
 913                if (strchr(ref->name, '^'))
 914                        continue; /* a dereference item */
 915                if (!prefixcmp(ref->name, refspec->src)) {
 916                        const char *match;
 917                        struct ref *cpy = copy_ref(ref);
 918                        match = ref->name + remote_prefix_len;
 919
 920                        cpy->peer_ref = alloc_ref(local_prefix_len +
 921                                                  strlen(match) + 1);
 922                        sprintf(cpy->peer_ref->name, "%s%s",
 923                                refspec->dst, match);
 924                        if (refspec->force)
 925                                cpy->peer_ref->force = 1;
 926                        *tail = cpy;
 927                        tail = &cpy->next;
 928                }
 929        }
 930
 931        return ret;
 932}
 933
 934static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
 935{
 936        const struct ref *ref;
 937        for (ref = refs; ref; ref = ref->next) {
 938                if (refname_match(name, ref->name, ref_fetch_rules))
 939                        return ref;
 940        }
 941        return NULL;
 942}
 943
 944struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
 945{
 946        const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
 947
 948        if (!ref)
 949                return NULL;
 950
 951        return copy_ref(ref);
 952}
 953
 954static struct ref *get_local_ref(const char *name)
 955{
 956        struct ref *ret;
 957        if (!name)
 958                return NULL;
 959
 960        if (!prefixcmp(name, "refs/")) {
 961                ret = alloc_ref(strlen(name) + 1);
 962                strcpy(ret->name, name);
 963                return ret;
 964        }
 965
 966        if (!prefixcmp(name, "heads/") ||
 967            !prefixcmp(name, "tags/") ||
 968            !prefixcmp(name, "remotes/")) {
 969                ret = alloc_ref(strlen(name) + 6);
 970                sprintf(ret->name, "refs/%s", name);
 971                return ret;
 972        }
 973
 974        ret = alloc_ref(strlen(name) + 12);
 975        sprintf(ret->name, "refs/heads/%s", name);
 976        return ret;
 977}
 978
 979int get_fetch_map(const struct ref *remote_refs,
 980                  const struct refspec *refspec,
 981                  struct ref ***tail,
 982                  int missing_ok)
 983{
 984        struct ref *ref_map, *rm;
 985
 986        if (refspec->pattern) {
 987                ref_map = get_expanded_map(remote_refs, refspec);
 988        } else {
 989                const char *name = refspec->src[0] ? refspec->src : "HEAD";
 990
 991                ref_map = get_remote_ref(remote_refs, name);
 992                if (!missing_ok && !ref_map)
 993                        die("Couldn't find remote ref %s", name);
 994                if (ref_map) {
 995                        ref_map->peer_ref = get_local_ref(refspec->dst);
 996                        if (ref_map->peer_ref && refspec->force)
 997                                ref_map->peer_ref->force = 1;
 998                }
 999        }
1000
1001        for (rm = ref_map; rm; rm = rm->next) {
1002                if (rm->peer_ref && check_ref_format(rm->peer_ref->name + 5))
1003                        die("* refusing to create funny ref '%s' locally",
1004                            rm->peer_ref->name);
1005        }
1006
1007        if (ref_map)
1008                tail_link_ref(ref_map, tail);
1009
1010        return 0;
1011}