Andrew's git / gitweb.git / remote.c
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remote.con commit Add a remote.*.mirror configuration option (84bb2df)
   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        struct strbuf 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
 262        /*
 263         * With "slash", e.g. "git fetch jgarzik/netdev-2.6" when
 264         * reading from $GIT_DIR/branches/jgarzik fetches "HEAD" from
 265         * the partial URL obtained from the branches file plus
 266         * "/netdev-2.6" and does not store it in any tracking ref.
 267         * #branch specifier in the file is ignored.
 268         *
 269         * Otherwise, the branches file would have URL and optionally
 270         * #branch specified.  The "master" (or specified) branch is
 271         * fetched and stored in the local branch of the same name.
 272         */
 273        strbuf_init(&branch, 0);
 274        frag = strchr(p, '#');
 275        if (frag) {
 276                *(frag++) = '\0';
 277                strbuf_addf(&branch, "refs/heads/%s", frag);
 278        } else
 279                strbuf_addstr(&branch, "refs/heads/master");
 280        if (!slash) {
 281                strbuf_addf(&branch, ":refs/heads/%s", remote->name);
 282        } else {
 283                strbuf_reset(&branch);
 284                strbuf_addstr(&branch, "HEAD:");
 285        }
 286        add_url_alias(remote, p);
 287        add_fetch_refspec(remote, strbuf_detach(&branch, 0));
 288        remote->fetch_tags = 1; /* always auto-follow */
 289}
 290
 291static int handle_config(const char *key, const char *value)
 292{
 293        const char *name;
 294        const char *subkey;
 295        struct remote *remote;
 296        struct branch *branch;
 297        if (!prefixcmp(key, "branch.")) {
 298                name = key + 7;
 299                subkey = strrchr(name, '.');
 300                if (!subkey)
 301                        return 0;
 302                branch = make_branch(name, subkey - name);
 303                if (!strcmp(subkey, ".remote")) {
 304                        if (!value)
 305                                return config_error_nonbool(key);
 306                        branch->remote_name = xstrdup(value);
 307                        if (branch == current_branch)
 308                                default_remote_name = branch->remote_name;
 309                } else if (!strcmp(subkey, ".merge")) {
 310                        if (!value)
 311                                return config_error_nonbool(key);
 312                        add_merge(branch, xstrdup(value));
 313                }
 314                return 0;
 315        }
 316        if (!prefixcmp(key, "url.")) {
 317                struct rewrite *rewrite;
 318                name = key + 4;
 319                subkey = strrchr(name, '.');
 320                if (!subkey)
 321                        return 0;
 322                rewrite = make_rewrite(name, subkey - name);
 323                if (!strcmp(subkey, ".insteadof")) {
 324                        if (!value)
 325                                return config_error_nonbool(key);
 326                        add_instead_of(rewrite, xstrdup(value));
 327                }
 328        }
 329        if (prefixcmp(key,  "remote."))
 330                return 0;
 331        name = key + 7;
 332        subkey = strrchr(name, '.');
 333        if (!subkey)
 334                return error("Config with no key for remote %s", name);
 335        if (*subkey == '/') {
 336                warning("Config remote shorthand cannot begin with '/': %s", name);
 337                return 0;
 338        }
 339        remote = make_remote(name, subkey - name);
 340        if (!strcmp(subkey, ".mirror"))
 341                remote->mirror = git_config_bool(key, value);
 342        else if (!strcmp(subkey, ".skipdefaultupdate"))
 343                remote->skip_default_update = git_config_bool(key, value);
 344
 345        else if (!strcmp(subkey, ".url")) {
 346                const char *v;
 347                if (git_config_string(&v, key, value))
 348                        return -1;
 349                add_url(remote, v);
 350        } else if (!strcmp(subkey, ".push")) {
 351                const char *v;
 352                if (git_config_string(&v, key, value))
 353                        return -1;
 354                add_push_refspec(remote, v);
 355        } else if (!strcmp(subkey, ".fetch")) {
 356                const char *v;
 357                if (git_config_string(&v, key, value))
 358                        return -1;
 359                add_fetch_refspec(remote, v);
 360        } else if (!strcmp(subkey, ".receivepack")) {
 361                const char *v;
 362                if (git_config_string(&v, key, value))
 363                        return -1;
 364                if (!remote->receivepack)
 365                        remote->receivepack = v;
 366                else
 367                        error("more than one receivepack given, using the first");
 368        } else if (!strcmp(subkey, ".uploadpack")) {
 369                const char *v;
 370                if (git_config_string(&v, key, value))
 371                        return -1;
 372                if (!remote->uploadpack)
 373                        remote->uploadpack = v;
 374                else
 375                        error("more than one uploadpack given, using the first");
 376        } else if (!strcmp(subkey, ".tagopt")) {
 377                if (!strcmp(value, "--no-tags"))
 378                        remote->fetch_tags = -1;
 379        } else if (!strcmp(subkey, ".proxy")) {
 380                return git_config_string((const char **)&remote->http_proxy,
 381                                         key, value);
 382        }
 383        return 0;
 384}
 385
 386static void alias_all_urls(void)
 387{
 388        int i, j;
 389        for (i = 0; i < remotes_nr; i++) {
 390                if (!remotes[i])
 391                        continue;
 392                for (j = 0; j < remotes[i]->url_nr; j++) {
 393                        remotes[i]->url[j] = alias_url(remotes[i]->url[j]);
 394                }
 395        }
 396}
 397
 398static void read_config(void)
 399{
 400        unsigned char sha1[20];
 401        const char *head_ref;
 402        int flag;
 403        if (default_remote_name) // did this already
 404                return;
 405        default_remote_name = xstrdup("origin");
 406        current_branch = NULL;
 407        head_ref = resolve_ref("HEAD", sha1, 0, &flag);
 408        if (head_ref && (flag & REF_ISSYMREF) &&
 409            !prefixcmp(head_ref, "refs/heads/")) {
 410                current_branch =
 411                        make_branch(head_ref + strlen("refs/heads/"), 0);
 412        }
 413        git_config(handle_config);
 414        alias_all_urls();
 415}
 416
 417static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
 418{
 419        int i;
 420        int st;
 421        struct refspec *rs = xcalloc(sizeof(*rs), nr_refspec);
 422
 423        for (i = 0; i < nr_refspec; i++) {
 424                size_t llen, rlen;
 425                int is_glob;
 426                const char *lhs, *rhs;
 427
 428                llen = rlen = is_glob = 0;
 429
 430                lhs = refspec[i];
 431                if (*lhs == '+') {
 432                        rs[i].force = 1;
 433                        lhs++;
 434                }
 435
 436                rhs = strrchr(lhs, ':');
 437                if (rhs) {
 438                        rhs++;
 439                        rlen = strlen(rhs);
 440                        is_glob = (2 <= rlen && !strcmp(rhs + rlen - 2, "/*"));
 441                        if (is_glob)
 442                                rlen -= 2;
 443                        rs[i].dst = xstrndup(rhs, rlen);
 444                }
 445
 446                llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
 447                if (2 <= llen && !memcmp(lhs + llen - 2, "/*", 2)) {
 448                        if ((rhs && !is_glob) || (!rhs && fetch))
 449                                goto invalid;
 450                        is_glob = 1;
 451                        llen -= 2;
 452                } else if (rhs && is_glob) {
 453                        goto invalid;
 454                }
 455
 456                rs[i].pattern = is_glob;
 457                rs[i].src = xstrndup(lhs, llen);
 458
 459                if (fetch) {
 460                        /*
 461                         * LHS
 462                         * - empty is allowed; it means HEAD.
 463                         * - otherwise it must be a valid looking ref.
 464                         */
 465                        if (!*rs[i].src)
 466                                ; /* empty is ok */
 467                        else {
 468                                st = check_ref_format(rs[i].src);
 469                                if (st && st != CHECK_REF_FORMAT_ONELEVEL)
 470                                        goto invalid;
 471                        }
 472                        /*
 473                         * RHS
 474                         * - missing is ok, and is same as empty.
 475                         * - empty is ok; it means not to store.
 476                         * - otherwise it must be a valid looking ref.
 477                         */
 478                        if (!rs[i].dst) {
 479                                ; /* ok */
 480                        } else if (!*rs[i].dst) {
 481                                ; /* ok */
 482                        } else {
 483                                st = check_ref_format(rs[i].dst);
 484                                if (st && st != CHECK_REF_FORMAT_ONELEVEL)
 485                                        goto invalid;
 486                        }
 487                } else {
 488                        /*
 489                         * LHS
 490                         * - empty is allowed; it means delete.
 491                         * - when wildcarded, it must be a valid looking ref.
 492                         * - otherwise, it must be an extended SHA-1, but
 493                         *   there is no existing way to validate this.
 494                         */
 495                        if (!*rs[i].src)
 496                                ; /* empty is ok */
 497                        else if (is_glob) {
 498                                st = check_ref_format(rs[i].src);
 499                                if (st && st != CHECK_REF_FORMAT_ONELEVEL)
 500                                        goto invalid;
 501                        }
 502                        else
 503                                ; /* anything goes, for now */
 504                        /*
 505                         * RHS
 506                         * - missing is allowed, but LHS then must be a
 507                         *   valid looking ref.
 508                         * - empty is not allowed.
 509                         * - otherwise it must be a valid looking ref.
 510                         */
 511                        if (!rs[i].dst) {
 512                                st = check_ref_format(rs[i].src);
 513                                if (st && st != CHECK_REF_FORMAT_ONELEVEL)
 514                                        goto invalid;
 515                        } else if (!*rs[i].dst) {
 516                                goto invalid;
 517                        } else {
 518                                st = check_ref_format(rs[i].dst);
 519                                if (st && st != CHECK_REF_FORMAT_ONELEVEL)
 520                                        goto invalid;
 521                        }
 522                }
 523        }
 524        return rs;
 525
 526 invalid:
 527        if (verify) {
 528                free(rs);
 529                return NULL;
 530        }
 531        die("Invalid refspec '%s'", refspec[i]);
 532}
 533
 534int valid_fetch_refspec(const char *fetch_refspec_str)
 535{
 536        const char *fetch_refspec[] = { fetch_refspec_str };
 537        struct refspec *refspec;
 538
 539        refspec = parse_refspec_internal(1, fetch_refspec, 1, 1);
 540        if (refspec)
 541                free(refspec);
 542        return !!refspec;
 543}
 544
 545struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec)
 546{
 547        return parse_refspec_internal(nr_refspec, refspec, 1, 0);
 548}
 549
 550struct refspec *parse_push_refspec(int nr_refspec, const char **refspec)
 551{
 552        return parse_refspec_internal(nr_refspec, refspec, 0, 0);
 553}
 554
 555static int valid_remote_nick(const char *name)
 556{
 557        if (!name[0] || /* not empty */
 558            (name[0] == '.' && /* not "." */
 559             (!name[1] || /* not ".." */
 560              (name[1] == '.' && !name[2]))))
 561                return 0;
 562        return !strchr(name, '/'); /* no slash */
 563}
 564
 565struct remote *remote_get(const char *name)
 566{
 567        struct remote *ret;
 568
 569        read_config();
 570        if (!name)
 571                name = default_remote_name;
 572        ret = make_remote(name, 0);
 573        if (valid_remote_nick(name)) {
 574                if (!ret->url)
 575                        read_remotes_file(ret);
 576                if (!ret->url)
 577                        read_branches_file(ret);
 578        }
 579        if (!ret->url)
 580                add_url_alias(ret, name);
 581        if (!ret->url)
 582                return NULL;
 583        ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
 584        ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
 585        return ret;
 586}
 587
 588int for_each_remote(each_remote_fn fn, void *priv)
 589{
 590        int i, result = 0;
 591        read_config();
 592        for (i = 0; i < remotes_nr && !result; i++) {
 593                struct remote *r = remotes[i];
 594                if (!r)
 595                        continue;
 596                if (!r->fetch)
 597                        r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
 598                                                       r->fetch_refspec);
 599                if (!r->push)
 600                        r->push = parse_push_refspec(r->push_refspec_nr,
 601                                                     r->push_refspec);
 602                result = fn(r, priv);
 603        }
 604        return result;
 605}
 606
 607void ref_remove_duplicates(struct ref *ref_map)
 608{
 609        struct ref **posn;
 610        struct ref *next;
 611        for (; ref_map; ref_map = ref_map->next) {
 612                if (!ref_map->peer_ref)
 613                        continue;
 614                posn = &ref_map->next;
 615                while (*posn) {
 616                        if ((*posn)->peer_ref &&
 617                            !strcmp((*posn)->peer_ref->name,
 618                                    ref_map->peer_ref->name)) {
 619                                if (strcmp((*posn)->name, ref_map->name))
 620                                        die("%s tracks both %s and %s",
 621                                            ref_map->peer_ref->name,
 622                                            (*posn)->name, ref_map->name);
 623                                next = (*posn)->next;
 624                                free((*posn)->peer_ref);
 625                                free(*posn);
 626                                *posn = next;
 627                        } else {
 628                                posn = &(*posn)->next;
 629                        }
 630                }
 631        }
 632}
 633
 634int remote_has_url(struct remote *remote, const char *url)
 635{
 636        int i;
 637        for (i = 0; i < remote->url_nr; i++) {
 638                if (!strcmp(remote->url[i], url))
 639                        return 1;
 640        }
 641        return 0;
 642}
 643
 644int remote_find_tracking(struct remote *remote, struct refspec *refspec)
 645{
 646        int find_src = refspec->src == NULL;
 647        char *needle, **result;
 648        int i;
 649
 650        if (find_src) {
 651                if (!refspec->dst)
 652                        return error("find_tracking: need either src or dst");
 653                needle = refspec->dst;
 654                result = &refspec->src;
 655        } else {
 656                needle = refspec->src;
 657                result = &refspec->dst;
 658        }
 659
 660        for (i = 0; i < remote->fetch_refspec_nr; i++) {
 661                struct refspec *fetch = &remote->fetch[i];
 662                const char *key = find_src ? fetch->dst : fetch->src;
 663                const char *value = find_src ? fetch->src : fetch->dst;
 664                if (!fetch->dst)
 665                        continue;
 666                if (fetch->pattern) {
 667                        if (!prefixcmp(needle, key) &&
 668                            needle[strlen(key)] == '/') {
 669                                *result = xmalloc(strlen(value) +
 670                                                  strlen(needle) -
 671                                                  strlen(key) + 1);
 672                                strcpy(*result, value);
 673                                strcpy(*result + strlen(value),
 674                                       needle + strlen(key));
 675                                refspec->force = fetch->force;
 676                                return 0;
 677                        }
 678                } else if (!strcmp(needle, key)) {
 679                        *result = xstrdup(value);
 680                        refspec->force = fetch->force;
 681                        return 0;
 682                }
 683        }
 684        return -1;
 685}
 686
 687struct ref *alloc_ref(unsigned namelen)
 688{
 689        struct ref *ret = xmalloc(sizeof(struct ref) + namelen);
 690        memset(ret, 0, sizeof(struct ref) + namelen);
 691        return ret;
 692}
 693
 694static struct ref *copy_ref(const struct ref *ref)
 695{
 696        struct ref *ret = xmalloc(sizeof(struct ref) + strlen(ref->name) + 1);
 697        memcpy(ret, ref, sizeof(struct ref) + strlen(ref->name) + 1);
 698        ret->next = NULL;
 699        return ret;
 700}
 701
 702struct ref *copy_ref_list(const struct ref *ref)
 703{
 704        struct ref *ret = NULL;
 705        struct ref **tail = &ret;
 706        while (ref) {
 707                *tail = copy_ref(ref);
 708                ref = ref->next;
 709                tail = &((*tail)->next);
 710        }
 711        return ret;
 712}
 713
 714void free_refs(struct ref *ref)
 715{
 716        struct ref *next;
 717        while (ref) {
 718                next = ref->next;
 719                free(ref->peer_ref);
 720                free(ref);
 721                ref = next;
 722        }
 723}
 724
 725static int count_refspec_match(const char *pattern,
 726                               struct ref *refs,
 727                               struct ref **matched_ref)
 728{
 729        int patlen = strlen(pattern);
 730        struct ref *matched_weak = NULL;
 731        struct ref *matched = NULL;
 732        int weak_match = 0;
 733        int match = 0;
 734
 735        for (weak_match = match = 0; refs; refs = refs->next) {
 736                char *name = refs->name;
 737                int namelen = strlen(name);
 738
 739                if (!refname_match(pattern, name, ref_rev_parse_rules))
 740                        continue;
 741
 742                /* A match is "weak" if it is with refs outside
 743                 * heads or tags, and did not specify the pattern
 744                 * in full (e.g. "refs/remotes/origin/master") or at
 745                 * least from the toplevel (e.g. "remotes/origin/master");
 746                 * otherwise "git push $URL master" would result in
 747                 * ambiguity between remotes/origin/master and heads/master
 748                 * at the remote site.
 749                 */
 750                if (namelen != patlen &&
 751                    patlen != namelen - 5 &&
 752                    prefixcmp(name, "refs/heads/") &&
 753                    prefixcmp(name, "refs/tags/")) {
 754                        /* We want to catch the case where only weak
 755                         * matches are found and there are multiple
 756                         * matches, and where more than one strong
 757                         * matches are found, as ambiguous.  One
 758                         * strong match with zero or more weak matches
 759                         * are acceptable as a unique match.
 760                         */
 761                        matched_weak = refs;
 762                        weak_match++;
 763                }
 764                else {
 765                        matched = refs;
 766                        match++;
 767                }
 768        }
 769        if (!matched) {
 770                *matched_ref = matched_weak;
 771                return weak_match;
 772        }
 773        else {
 774                *matched_ref = matched;
 775                return match;
 776        }
 777}
 778
 779static void tail_link_ref(struct ref *ref, struct ref ***tail)
 780{
 781        **tail = ref;
 782        while (ref->next)
 783                ref = ref->next;
 784        *tail = &ref->next;
 785}
 786
 787static struct ref *try_explicit_object_name(const char *name)
 788{
 789        unsigned char sha1[20];
 790        struct ref *ref;
 791        int len;
 792
 793        if (!*name) {
 794                ref = alloc_ref(20);
 795                strcpy(ref->name, "(delete)");
 796                hashclr(ref->new_sha1);
 797                return ref;
 798        }
 799        if (get_sha1(name, sha1))
 800                return NULL;
 801        len = strlen(name) + 1;
 802        ref = alloc_ref(len);
 803        memcpy(ref->name, name, len);
 804        hashcpy(ref->new_sha1, sha1);
 805        return ref;
 806}
 807
 808static struct ref *make_linked_ref(const char *name, struct ref ***tail)
 809{
 810        struct ref *ret;
 811        size_t len;
 812
 813        len = strlen(name) + 1;
 814        ret = alloc_ref(len);
 815        memcpy(ret->name, name, len);
 816        tail_link_ref(ret, tail);
 817        return ret;
 818}
 819
 820static int match_explicit(struct ref *src, struct ref *dst,
 821                          struct ref ***dst_tail,
 822                          struct refspec *rs,
 823                          int errs)
 824{
 825        struct ref *matched_src, *matched_dst;
 826
 827        const char *dst_value = rs->dst;
 828
 829        if (rs->pattern)
 830                return errs;
 831
 832        matched_src = matched_dst = NULL;
 833        switch (count_refspec_match(rs->src, src, &matched_src)) {
 834        case 1:
 835                break;
 836        case 0:
 837                /* The source could be in the get_sha1() format
 838                 * not a reference name.  :refs/other is a
 839                 * way to delete 'other' ref at the remote end.
 840                 */
 841                matched_src = try_explicit_object_name(rs->src);
 842                if (!matched_src)
 843                        error("src refspec %s does not match any.", rs->src);
 844                break;
 845        default:
 846                matched_src = NULL;
 847                error("src refspec %s matches more than one.", rs->src);
 848                break;
 849        }
 850
 851        if (!matched_src)
 852                errs = 1;
 853
 854        if (!dst_value) {
 855                unsigned char sha1[20];
 856                int flag;
 857
 858                if (!matched_src)
 859                        return errs;
 860                dst_value = resolve_ref(matched_src->name, sha1, 1, &flag);
 861                if (!dst_value ||
 862                    ((flag & REF_ISSYMREF) &&
 863                     prefixcmp(dst_value, "refs/heads/")))
 864                        die("%s cannot be resolved to branch.",
 865                            matched_src->name);
 866        }
 867
 868        switch (count_refspec_match(dst_value, dst, &matched_dst)) {
 869        case 1:
 870                break;
 871        case 0:
 872                if (!memcmp(dst_value, "refs/", 5))
 873                        matched_dst = make_linked_ref(dst_value, dst_tail);
 874                else
 875                        error("dst refspec %s does not match any "
 876                              "existing ref on the remote and does "
 877                              "not start with refs/.", dst_value);
 878                break;
 879        default:
 880                matched_dst = NULL;
 881                error("dst refspec %s matches more than one.",
 882                      dst_value);
 883                break;
 884        }
 885        if (errs || !matched_dst)
 886                return 1;
 887        if (matched_dst->peer_ref) {
 888                errs = 1;
 889                error("dst ref %s receives from more than one src.",
 890                      matched_dst->name);
 891        }
 892        else {
 893                matched_dst->peer_ref = matched_src;
 894                matched_dst->force = rs->force;
 895        }
 896        return errs;
 897}
 898
 899static int match_explicit_refs(struct ref *src, struct ref *dst,
 900                               struct ref ***dst_tail, struct refspec *rs,
 901                               int rs_nr)
 902{
 903        int i, errs;
 904        for (i = errs = 0; i < rs_nr; i++)
 905                errs |= match_explicit(src, dst, dst_tail, &rs[i], errs);
 906        return -errs;
 907}
 908
 909static const struct refspec *check_pattern_match(const struct refspec *rs,
 910                                                 int rs_nr,
 911                                                 const struct ref *src)
 912{
 913        int i;
 914        for (i = 0; i < rs_nr; i++) {
 915                if (rs[i].pattern &&
 916                    !prefixcmp(src->name, rs[i].src) &&
 917                    src->name[strlen(rs[i].src)] == '/')
 918                        return rs + i;
 919        }
 920        return NULL;
 921}
 922
 923/*
 924 * Note. This is used only by "push"; refspec matching rules for
 925 * push and fetch are subtly different, so do not try to reuse it
 926 * without thinking.
 927 */
 928int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
 929               int nr_refspec, const char **refspec, int flags)
 930{
 931        struct refspec *rs =
 932                parse_push_refspec(nr_refspec, (const char **) refspec);
 933        int send_all = flags & MATCH_REFS_ALL;
 934        int send_mirror = flags & MATCH_REFS_MIRROR;
 935
 936        if (match_explicit_refs(src, dst, dst_tail, rs, nr_refspec))
 937                return -1;
 938
 939        /* pick the remainder */
 940        for ( ; src; src = src->next) {
 941                struct ref *dst_peer;
 942                const struct refspec *pat = NULL;
 943                char *dst_name;
 944                if (src->peer_ref)
 945                        continue;
 946                if (nr_refspec) {
 947                        pat = check_pattern_match(rs, nr_refspec, src);
 948                        if (!pat)
 949                                continue;
 950                }
 951                else if (!send_mirror && prefixcmp(src->name, "refs/heads/"))
 952                        /*
 953                         * "matching refs"; traditionally we pushed everything
 954                         * including refs outside refs/heads/ hierarchy, but
 955                         * that does not make much sense these days.
 956                         */
 957                        continue;
 958
 959                if (pat) {
 960                        const char *dst_side = pat->dst ? pat->dst : pat->src;
 961                        dst_name = xmalloc(strlen(dst_side) +
 962                                           strlen(src->name) -
 963                                           strlen(pat->src) + 2);
 964                        strcpy(dst_name, dst_side);
 965                        strcat(dst_name, src->name + strlen(pat->src));
 966                } else
 967                        dst_name = xstrdup(src->name);
 968                dst_peer = find_ref_by_name(dst, dst_name);
 969                if (dst_peer && dst_peer->peer_ref)
 970                        /* We're already sending something to this ref. */
 971                        goto free_name;
 972
 973                if (!dst_peer && !nr_refspec && !(send_all || send_mirror))
 974                        /*
 975                         * Remote doesn't have it, and we have no
 976                         * explicit pattern, and we don't have
 977                         * --all nor --mirror.
 978                         */
 979                        goto free_name;
 980                if (!dst_peer) {
 981                        /* Create a new one and link it */
 982                        dst_peer = make_linked_ref(dst_name, dst_tail);
 983                        hashcpy(dst_peer->new_sha1, src->new_sha1);
 984                }
 985                dst_peer->peer_ref = src;
 986                if (pat)
 987                        dst_peer->force = pat->force;
 988        free_name:
 989                free(dst_name);
 990        }
 991        return 0;
 992}
 993
 994struct branch *branch_get(const char *name)
 995{
 996        struct branch *ret;
 997
 998        read_config();
 999        if (!name || !*name || !strcmp(name, "HEAD"))
1000                ret = current_branch;
1001        else
1002                ret = make_branch(name, 0);
1003        if (ret && ret->remote_name) {
1004                ret->remote = remote_get(ret->remote_name);
1005                if (ret->merge_nr) {
1006                        int i;
1007                        ret->merge = xcalloc(sizeof(*ret->merge),
1008                                             ret->merge_nr);
1009                        for (i = 0; i < ret->merge_nr; i++) {
1010                                ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1011                                ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1012                                remote_find_tracking(ret->remote,
1013                                                     ret->merge[i]);
1014                        }
1015                }
1016        }
1017        return ret;
1018}
1019
1020int branch_has_merge_config(struct branch *branch)
1021{
1022        return branch && !!branch->merge;
1023}
1024
1025int branch_merge_matches(struct branch *branch,
1026                                 int i,
1027                                 const char *refname)
1028{
1029        if (!branch || i < 0 || i >= branch->merge_nr)
1030                return 0;
1031        return refname_match(branch->merge[i]->src, refname, ref_fetch_rules);
1032}
1033
1034static struct ref *get_expanded_map(const struct ref *remote_refs,
1035                                    const struct refspec *refspec)
1036{
1037        const struct ref *ref;
1038        struct ref *ret = NULL;
1039        struct ref **tail = &ret;
1040
1041        int remote_prefix_len = strlen(refspec->src);
1042        int local_prefix_len = strlen(refspec->dst);
1043
1044        for (ref = remote_refs; ref; ref = ref->next) {
1045                if (strchr(ref->name, '^'))
1046                        continue; /* a dereference item */
1047                if (!prefixcmp(ref->name, refspec->src)) {
1048                        const char *match;
1049                        struct ref *cpy = copy_ref(ref);
1050                        match = ref->name + remote_prefix_len;
1051
1052                        cpy->peer_ref = alloc_ref(local_prefix_len +
1053                                                  strlen(match) + 1);
1054                        sprintf(cpy->peer_ref->name, "%s%s",
1055                                refspec->dst, match);
1056                        if (refspec->force)
1057                                cpy->peer_ref->force = 1;
1058                        *tail = cpy;
1059                        tail = &cpy->next;
1060                }
1061        }
1062
1063        return ret;
1064}
1065
1066static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1067{
1068        const struct ref *ref;
1069        for (ref = refs; ref; ref = ref->next) {
1070                if (refname_match(name, ref->name, ref_fetch_rules))
1071                        return ref;
1072        }
1073        return NULL;
1074}
1075
1076struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1077{
1078        const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1079
1080        if (!ref)
1081                return NULL;
1082
1083        return copy_ref(ref);
1084}
1085
1086static struct ref *get_local_ref(const char *name)
1087{
1088        struct ref *ret;
1089        if (!name)
1090                return NULL;
1091
1092        if (!prefixcmp(name, "refs/")) {
1093                ret = alloc_ref(strlen(name) + 1);
1094                strcpy(ret->name, name);
1095                return ret;
1096        }
1097
1098        if (!prefixcmp(name, "heads/") ||
1099            !prefixcmp(name, "tags/") ||
1100            !prefixcmp(name, "remotes/")) {
1101                ret = alloc_ref(strlen(name) + 6);
1102                sprintf(ret->name, "refs/%s", name);
1103                return ret;
1104        }
1105
1106        ret = alloc_ref(strlen(name) + 12);
1107        sprintf(ret->name, "refs/heads/%s", name);
1108        return ret;
1109}
1110
1111int get_fetch_map(const struct ref *remote_refs,
1112                  const struct refspec *refspec,
1113                  struct ref ***tail,
1114                  int missing_ok)
1115{
1116        struct ref *ref_map, **rmp;
1117
1118        if (refspec->pattern) {
1119                ref_map = get_expanded_map(remote_refs, refspec);
1120        } else {
1121                const char *name = refspec->src[0] ? refspec->src : "HEAD";
1122
1123                ref_map = get_remote_ref(remote_refs, name);
1124                if (!missing_ok && !ref_map)
1125                        die("Couldn't find remote ref %s", name);
1126                if (ref_map) {
1127                        ref_map->peer_ref = get_local_ref(refspec->dst);
1128                        if (ref_map->peer_ref && refspec->force)
1129                                ref_map->peer_ref->force = 1;
1130                }
1131        }
1132
1133        for (rmp = &ref_map; *rmp; ) {
1134                if ((*rmp)->peer_ref) {
1135                        int st = check_ref_format((*rmp)->peer_ref->name + 5);
1136                        if (st && st != CHECK_REF_FORMAT_ONELEVEL) {
1137                                struct ref *ignore = *rmp;
1138                                error("* Ignoring funny ref '%s' locally",
1139                                      (*rmp)->peer_ref->name);
1140                                *rmp = (*rmp)->next;
1141                                free(ignore->peer_ref);
1142                                free(ignore);
1143                                continue;
1144                        }
1145                }
1146                rmp = &((*rmp)->next);
1147        }
1148
1149        if (ref_map)
1150                tail_link_ref(ref_map, tail);
1151
1152        return 0;
1153}