remote.con commit Merge branch 'master' into git-po (508d124)
   1#include "cache.h"
   2#include "remote.h"
   3#include "refs.h"
   4#include "commit.h"
   5#include "diff.h"
   6#include "revision.h"
   7#include "dir.h"
   8#include "tag.h"
   9#include "string-list.h"
  10
  11enum map_direction { FROM_SRC, FROM_DST };
  12
  13static struct refspec s_tag_refspec = {
  14        0,
  15        1,
  16        0,
  17        "refs/tags/*",
  18        "refs/tags/*"
  19};
  20
  21const struct refspec *tag_refspec = &s_tag_refspec;
  22
  23struct counted_string {
  24        size_t len;
  25        const char *s;
  26};
  27struct rewrite {
  28        const char *base;
  29        size_t baselen;
  30        struct counted_string *instead_of;
  31        int instead_of_nr;
  32        int instead_of_alloc;
  33};
  34struct rewrites {
  35        struct rewrite **rewrite;
  36        int rewrite_alloc;
  37        int rewrite_nr;
  38};
  39
  40static struct remote **remotes;
  41static int remotes_alloc;
  42static int remotes_nr;
  43
  44static struct branch **branches;
  45static int branches_alloc;
  46static int branches_nr;
  47
  48static struct branch *current_branch;
  49static const char *default_remote_name;
  50static int explicit_default_remote_name;
  51
  52static struct rewrites rewrites;
  53static struct rewrites rewrites_push;
  54
  55#define BUF_SIZE (2048)
  56static char buffer[BUF_SIZE];
  57
  58static int valid_remote(const struct remote *remote)
  59{
  60        return (!!remote->url) || (!!remote->foreign_vcs);
  61}
  62
  63static const char *alias_url(const char *url, struct rewrites *r)
  64{
  65        int i, j;
  66        char *ret;
  67        struct counted_string *longest;
  68        int longest_i;
  69
  70        longest = NULL;
  71        longest_i = -1;
  72        for (i = 0; i < r->rewrite_nr; i++) {
  73                if (!r->rewrite[i])
  74                        continue;
  75                for (j = 0; j < r->rewrite[i]->instead_of_nr; j++) {
  76                        if (!prefixcmp(url, r->rewrite[i]->instead_of[j].s) &&
  77                            (!longest ||
  78                             longest->len < r->rewrite[i]->instead_of[j].len)) {
  79                                longest = &(r->rewrite[i]->instead_of[j]);
  80                                longest_i = i;
  81                        }
  82                }
  83        }
  84        if (!longest)
  85                return url;
  86
  87        ret = xmalloc(r->rewrite[longest_i]->baselen +
  88                     (strlen(url) - longest->len) + 1);
  89        strcpy(ret, r->rewrite[longest_i]->base);
  90        strcpy(ret + r->rewrite[longest_i]->baselen, url + longest->len);
  91        return ret;
  92}
  93
  94static void add_push_refspec(struct remote *remote, const char *ref)
  95{
  96        ALLOC_GROW(remote->push_refspec,
  97                   remote->push_refspec_nr + 1,
  98                   remote->push_refspec_alloc);
  99        remote->push_refspec[remote->push_refspec_nr++] = ref;
 100}
 101
 102static void add_fetch_refspec(struct remote *remote, const char *ref)
 103{
 104        ALLOC_GROW(remote->fetch_refspec,
 105                   remote->fetch_refspec_nr + 1,
 106                   remote->fetch_refspec_alloc);
 107        remote->fetch_refspec[remote->fetch_refspec_nr++] = ref;
 108}
 109
 110static void add_url(struct remote *remote, const char *url)
 111{
 112        ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
 113        remote->url[remote->url_nr++] = url;
 114}
 115
 116static void add_pushurl(struct remote *remote, const char *pushurl)
 117{
 118        ALLOC_GROW(remote->pushurl, remote->pushurl_nr + 1, remote->pushurl_alloc);
 119        remote->pushurl[remote->pushurl_nr++] = pushurl;
 120}
 121
 122static void add_pushurl_alias(struct remote *remote, const char *url)
 123{
 124        const char *pushurl = alias_url(url, &rewrites_push);
 125        if (pushurl != url)
 126                add_pushurl(remote, pushurl);
 127}
 128
 129static void add_url_alias(struct remote *remote, const char *url)
 130{
 131        add_url(remote, alias_url(url, &rewrites));
 132        add_pushurl_alias(remote, url);
 133}
 134
 135static struct remote *make_remote(const char *name, int len)
 136{
 137        struct remote *ret;
 138        int i;
 139
 140        for (i = 0; i < remotes_nr; i++) {
 141                if (len ? (!strncmp(name, remotes[i]->name, len) &&
 142                           !remotes[i]->name[len]) :
 143                    !strcmp(name, remotes[i]->name))
 144                        return remotes[i];
 145        }
 146
 147        ret = xcalloc(1, sizeof(struct remote));
 148        ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
 149        remotes[remotes_nr++] = ret;
 150        if (len)
 151                ret->name = xstrndup(name, len);
 152        else
 153                ret->name = xstrdup(name);
 154        return ret;
 155}
 156
 157static void add_merge(struct branch *branch, const char *name)
 158{
 159        ALLOC_GROW(branch->merge_name, branch->merge_nr + 1,
 160                   branch->merge_alloc);
 161        branch->merge_name[branch->merge_nr++] = name;
 162}
 163
 164static struct branch *make_branch(const char *name, int len)
 165{
 166        struct branch *ret;
 167        int i;
 168        char *refname;
 169
 170        for (i = 0; i < branches_nr; i++) {
 171                if (len ? (!strncmp(name, branches[i]->name, len) &&
 172                           !branches[i]->name[len]) :
 173                    !strcmp(name, branches[i]->name))
 174                        return branches[i];
 175        }
 176
 177        ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
 178        ret = xcalloc(1, sizeof(struct branch));
 179        branches[branches_nr++] = ret;
 180        if (len)
 181                ret->name = xstrndup(name, len);
 182        else
 183                ret->name = xstrdup(name);
 184        refname = xmalloc(strlen(name) + strlen("refs/heads/") + 1);
 185        strcpy(refname, "refs/heads/");
 186        strcpy(refname + strlen("refs/heads/"), ret->name);
 187        ret->refname = refname;
 188
 189        return ret;
 190}
 191
 192static struct rewrite *make_rewrite(struct rewrites *r, const char *base, int len)
 193{
 194        struct rewrite *ret;
 195        int i;
 196
 197        for (i = 0; i < r->rewrite_nr; i++) {
 198                if (len
 199                    ? (len == r->rewrite[i]->baselen &&
 200                       !strncmp(base, r->rewrite[i]->base, len))
 201                    : !strcmp(base, r->rewrite[i]->base))
 202                        return r->rewrite[i];
 203        }
 204
 205        ALLOC_GROW(r->rewrite, r->rewrite_nr + 1, r->rewrite_alloc);
 206        ret = xcalloc(1, sizeof(struct rewrite));
 207        r->rewrite[r->rewrite_nr++] = ret;
 208        if (len) {
 209                ret->base = xstrndup(base, len);
 210                ret->baselen = len;
 211        }
 212        else {
 213                ret->base = xstrdup(base);
 214                ret->baselen = strlen(base);
 215        }
 216        return ret;
 217}
 218
 219static void add_instead_of(struct rewrite *rewrite, const char *instead_of)
 220{
 221        ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
 222        rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
 223        rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
 224        rewrite->instead_of_nr++;
 225}
 226
 227static void read_remotes_file(struct remote *remote)
 228{
 229        FILE *f = fopen(git_path("remotes/%s", remote->name), "r");
 230
 231        if (!f)
 232                return;
 233        remote->origin = REMOTE_REMOTES;
 234        while (fgets(buffer, BUF_SIZE, f)) {
 235                int value_list;
 236                char *s, *p;
 237
 238                if (!prefixcmp(buffer, "URL:")) {
 239                        value_list = 0;
 240                        s = buffer + 4;
 241                } else if (!prefixcmp(buffer, "Push:")) {
 242                        value_list = 1;
 243                        s = buffer + 5;
 244                } else if (!prefixcmp(buffer, "Pull:")) {
 245                        value_list = 2;
 246                        s = buffer + 5;
 247                } else
 248                        continue;
 249
 250                while (isspace(*s))
 251                        s++;
 252                if (!*s)
 253                        continue;
 254
 255                p = s + strlen(s);
 256                while (isspace(p[-1]))
 257                        *--p = 0;
 258
 259                switch (value_list) {
 260                case 0:
 261                        add_url_alias(remote, xstrdup(s));
 262                        break;
 263                case 1:
 264                        add_push_refspec(remote, xstrdup(s));
 265                        break;
 266                case 2:
 267                        add_fetch_refspec(remote, xstrdup(s));
 268                        break;
 269                }
 270        }
 271        fclose(f);
 272}
 273
 274static void read_branches_file(struct remote *remote)
 275{
 276        const char *slash = strchr(remote->name, '/');
 277        char *frag;
 278        struct strbuf branch = STRBUF_INIT;
 279        int n = slash ? slash - remote->name : 1000;
 280        FILE *f = fopen(git_path("branches/%.*s", n, remote->name), "r");
 281        char *s, *p;
 282        int len;
 283
 284        if (!f)
 285                return;
 286        s = fgets(buffer, BUF_SIZE, f);
 287        fclose(f);
 288        if (!s)
 289                return;
 290        while (isspace(*s))
 291                s++;
 292        if (!*s)
 293                return;
 294        remote->origin = REMOTE_BRANCHES;
 295        p = s + strlen(s);
 296        while (isspace(p[-1]))
 297                *--p = 0;
 298        len = p - s;
 299        if (slash)
 300                len += strlen(slash);
 301        p = xmalloc(len + 1);
 302        strcpy(p, s);
 303        if (slash)
 304                strcat(p, slash);
 305
 306        /*
 307         * With "slash", e.g. "git fetch jgarzik/netdev-2.6" when
 308         * reading from $GIT_DIR/branches/jgarzik fetches "HEAD" from
 309         * the partial URL obtained from the branches file plus
 310         * "/netdev-2.6" and does not store it in any tracking ref.
 311         * #branch specifier in the file is ignored.
 312         *
 313         * Otherwise, the branches file would have URL and optionally
 314         * #branch specified.  The "master" (or specified) branch is
 315         * fetched and stored in the local branch of the same name.
 316         */
 317        frag = strchr(p, '#');
 318        if (frag) {
 319                *(frag++) = '\0';
 320                strbuf_addf(&branch, "refs/heads/%s", frag);
 321        } else
 322                strbuf_addstr(&branch, "refs/heads/master");
 323        if (!slash) {
 324                strbuf_addf(&branch, ":refs/heads/%s", remote->name);
 325        } else {
 326                strbuf_reset(&branch);
 327                strbuf_addstr(&branch, "HEAD:");
 328        }
 329        add_url_alias(remote, p);
 330        add_fetch_refspec(remote, strbuf_detach(&branch, NULL));
 331        /*
 332         * Cogito compatible push: push current HEAD to remote #branch
 333         * (master if missing)
 334         */
 335        strbuf_init(&branch, 0);
 336        strbuf_addstr(&branch, "HEAD");
 337        if (frag)
 338                strbuf_addf(&branch, ":refs/heads/%s", frag);
 339        else
 340                strbuf_addstr(&branch, ":refs/heads/master");
 341        add_push_refspec(remote, strbuf_detach(&branch, NULL));
 342        remote->fetch_tags = 1; /* always auto-follow */
 343}
 344
 345static int handle_config(const char *key, const char *value, void *cb)
 346{
 347        const char *name;
 348        const char *subkey;
 349        struct remote *remote;
 350        struct branch *branch;
 351        if (!prefixcmp(key, "branch.")) {
 352                name = key + 7;
 353                subkey = strrchr(name, '.');
 354                if (!subkey)
 355                        return 0;
 356                branch = make_branch(name, subkey - name);
 357                if (!strcmp(subkey, ".remote")) {
 358                        if (!value)
 359                                return config_error_nonbool(key);
 360                        branch->remote_name = xstrdup(value);
 361                        if (branch == current_branch) {
 362                                default_remote_name = branch->remote_name;
 363                                explicit_default_remote_name = 1;
 364                        }
 365                } else if (!strcmp(subkey, ".merge")) {
 366                        if (!value)
 367                                return config_error_nonbool(key);
 368                        add_merge(branch, xstrdup(value));
 369                }
 370                return 0;
 371        }
 372        if (!prefixcmp(key, "url.")) {
 373                struct rewrite *rewrite;
 374                name = key + 4;
 375                subkey = strrchr(name, '.');
 376                if (!subkey)
 377                        return 0;
 378                if (!strcmp(subkey, ".insteadof")) {
 379                        rewrite = make_rewrite(&rewrites, name, subkey - name);
 380                        if (!value)
 381                                return config_error_nonbool(key);
 382                        add_instead_of(rewrite, xstrdup(value));
 383                } else if (!strcmp(subkey, ".pushinsteadof")) {
 384                        rewrite = make_rewrite(&rewrites_push, name, subkey - name);
 385                        if (!value)
 386                                return config_error_nonbool(key);
 387                        add_instead_of(rewrite, xstrdup(value));
 388                }
 389        }
 390        if (prefixcmp(key,  "remote."))
 391                return 0;
 392        name = key + 7;
 393        if (*name == '/') {
 394                warning("Config remote shorthand cannot begin with '/': %s",
 395                        name);
 396                return 0;
 397        }
 398        subkey = strrchr(name, '.');
 399        if (!subkey)
 400                return 0;
 401        remote = make_remote(name, subkey - name);
 402        remote->origin = REMOTE_CONFIG;
 403        if (!strcmp(subkey, ".mirror"))
 404                remote->mirror = git_config_bool(key, value);
 405        else if (!strcmp(subkey, ".skipdefaultupdate"))
 406                remote->skip_default_update = git_config_bool(key, value);
 407        else if (!strcmp(subkey, ".skipfetchall"))
 408                remote->skip_default_update = git_config_bool(key, value);
 409        else if (!strcmp(subkey, ".url")) {
 410                const char *v;
 411                if (git_config_string(&v, key, value))
 412                        return -1;
 413                add_url(remote, v);
 414        } else if (!strcmp(subkey, ".pushurl")) {
 415                const char *v;
 416                if (git_config_string(&v, key, value))
 417                        return -1;
 418                add_pushurl(remote, v);
 419        } else if (!strcmp(subkey, ".push")) {
 420                const char *v;
 421                if (git_config_string(&v, key, value))
 422                        return -1;
 423                add_push_refspec(remote, v);
 424        } else if (!strcmp(subkey, ".fetch")) {
 425                const char *v;
 426                if (git_config_string(&v, key, value))
 427                        return -1;
 428                add_fetch_refspec(remote, v);
 429        } else if (!strcmp(subkey, ".receivepack")) {
 430                const char *v;
 431                if (git_config_string(&v, key, value))
 432                        return -1;
 433                if (!remote->receivepack)
 434                        remote->receivepack = v;
 435                else
 436                        error("more than one receivepack given, using the first");
 437        } else if (!strcmp(subkey, ".uploadpack")) {
 438                const char *v;
 439                if (git_config_string(&v, key, value))
 440                        return -1;
 441                if (!remote->uploadpack)
 442                        remote->uploadpack = v;
 443                else
 444                        error("more than one uploadpack given, using the first");
 445        } else if (!strcmp(subkey, ".tagopt")) {
 446                if (!strcmp(value, "--no-tags"))
 447                        remote->fetch_tags = -1;
 448                else if (!strcmp(value, "--tags"))
 449                        remote->fetch_tags = 2;
 450        } else if (!strcmp(subkey, ".proxy")) {
 451                return git_config_string((const char **)&remote->http_proxy,
 452                                         key, value);
 453        } else if (!strcmp(subkey, ".vcs")) {
 454                return git_config_string(&remote->foreign_vcs, key, value);
 455        }
 456        return 0;
 457}
 458
 459static void alias_all_urls(void)
 460{
 461        int i, j;
 462        for (i = 0; i < remotes_nr; i++) {
 463                int add_pushurl_aliases;
 464                if (!remotes[i])
 465                        continue;
 466                for (j = 0; j < remotes[i]->pushurl_nr; j++) {
 467                        remotes[i]->pushurl[j] = alias_url(remotes[i]->pushurl[j], &rewrites);
 468                }
 469                add_pushurl_aliases = remotes[i]->pushurl_nr == 0;
 470                for (j = 0; j < remotes[i]->url_nr; j++) {
 471                        if (add_pushurl_aliases)
 472                                add_pushurl_alias(remotes[i], remotes[i]->url[j]);
 473                        remotes[i]->url[j] = alias_url(remotes[i]->url[j], &rewrites);
 474                }
 475        }
 476}
 477
 478static void read_config(void)
 479{
 480        unsigned char sha1[20];
 481        const char *head_ref;
 482        int flag;
 483        if (default_remote_name) /* did this already */
 484                return;
 485        default_remote_name = xstrdup("origin");
 486        current_branch = NULL;
 487        head_ref = resolve_ref_unsafe("HEAD", sha1, 0, &flag);
 488        if (head_ref && (flag & REF_ISSYMREF) &&
 489            !prefixcmp(head_ref, "refs/heads/")) {
 490                current_branch =
 491                        make_branch(head_ref + strlen("refs/heads/"), 0);
 492        }
 493        git_config(handle_config, NULL);
 494        alias_all_urls();
 495}
 496
 497/*
 498 * This function frees a refspec array.
 499 * Warning: code paths should be checked to ensure that the src
 500 *          and dst pointers are always freeable pointers as well
 501 *          as the refspec pointer itself.
 502 */
 503static void free_refspecs(struct refspec *refspec, int nr_refspec)
 504{
 505        int i;
 506
 507        if (!refspec)
 508                return;
 509
 510        for (i = 0; i < nr_refspec; i++) {
 511                free(refspec[i].src);
 512                free(refspec[i].dst);
 513        }
 514        free(refspec);
 515}
 516
 517static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
 518{
 519        int i;
 520        struct refspec *rs = xcalloc(sizeof(*rs), nr_refspec);
 521
 522        for (i = 0; i < nr_refspec; i++) {
 523                size_t llen;
 524                int is_glob;
 525                const char *lhs, *rhs;
 526                int flags;
 527
 528                is_glob = 0;
 529
 530                lhs = refspec[i];
 531                if (*lhs == '+') {
 532                        rs[i].force = 1;
 533                        lhs++;
 534                }
 535
 536                rhs = strrchr(lhs, ':');
 537
 538                /*
 539                 * Before going on, special case ":" (or "+:") as a refspec
 540                 * for matching refs.
 541                 */
 542                if (!fetch && rhs == lhs && rhs[1] == '\0') {
 543                        rs[i].matching = 1;
 544                        continue;
 545                }
 546
 547                if (rhs) {
 548                        size_t rlen = strlen(++rhs);
 549                        is_glob = (1 <= rlen && strchr(rhs, '*'));
 550                        rs[i].dst = xstrndup(rhs, rlen);
 551                }
 552
 553                llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
 554                if (1 <= llen && memchr(lhs, '*', llen)) {
 555                        if ((rhs && !is_glob) || (!rhs && fetch))
 556                                goto invalid;
 557                        is_glob = 1;
 558                } else if (rhs && is_glob) {
 559                        goto invalid;
 560                }
 561
 562                rs[i].pattern = is_glob;
 563                rs[i].src = xstrndup(lhs, llen);
 564                flags = REFNAME_ALLOW_ONELEVEL | (is_glob ? REFNAME_REFSPEC_PATTERN : 0);
 565
 566                if (fetch) {
 567                        /*
 568                         * LHS
 569                         * - empty is allowed; it means HEAD.
 570                         * - otherwise it must be a valid looking ref.
 571                         */
 572                        if (!*rs[i].src)
 573                                ; /* empty is ok */
 574                        else if (check_refname_format(rs[i].src, flags))
 575                                goto invalid;
 576                        /*
 577                         * RHS
 578                         * - missing is ok, and is same as empty.
 579                         * - empty is ok; it means not to store.
 580                         * - otherwise it must be a valid looking ref.
 581                         */
 582                        if (!rs[i].dst)
 583                                ; /* ok */
 584                        else if (!*rs[i].dst)
 585                                ; /* ok */
 586                        else if (check_refname_format(rs[i].dst, flags))
 587                                goto invalid;
 588                } else {
 589                        /*
 590                         * LHS
 591                         * - empty is allowed; it means delete.
 592                         * - when wildcarded, it must be a valid looking ref.
 593                         * - otherwise, it must be an extended SHA-1, but
 594                         *   there is no existing way to validate this.
 595                         */
 596                        if (!*rs[i].src)
 597                                ; /* empty is ok */
 598                        else if (is_glob) {
 599                                if (check_refname_format(rs[i].src, flags))
 600                                        goto invalid;
 601                        }
 602                        else
 603                                ; /* anything goes, for now */
 604                        /*
 605                         * RHS
 606                         * - missing is allowed, but LHS then must be a
 607                         *   valid looking ref.
 608                         * - empty is not allowed.
 609                         * - otherwise it must be a valid looking ref.
 610                         */
 611                        if (!rs[i].dst) {
 612                                if (check_refname_format(rs[i].src, flags))
 613                                        goto invalid;
 614                        } else if (!*rs[i].dst) {
 615                                goto invalid;
 616                        } else {
 617                                if (check_refname_format(rs[i].dst, flags))
 618                                        goto invalid;
 619                        }
 620                }
 621        }
 622        return rs;
 623
 624 invalid:
 625        if (verify) {
 626                /*
 627                 * nr_refspec must be greater than zero and i must be valid
 628                 * since it is only possible to reach this point from within
 629                 * the for loop above.
 630                 */
 631                free_refspecs(rs, i+1);
 632                return NULL;
 633        }
 634        die("Invalid refspec '%s'", refspec[i]);
 635}
 636
 637int valid_fetch_refspec(const char *fetch_refspec_str)
 638{
 639        struct refspec *refspec;
 640
 641        refspec = parse_refspec_internal(1, &fetch_refspec_str, 1, 1);
 642        free_refspecs(refspec, 1);
 643        return !!refspec;
 644}
 645
 646struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec)
 647{
 648        return parse_refspec_internal(nr_refspec, refspec, 1, 0);
 649}
 650
 651static struct refspec *parse_push_refspec(int nr_refspec, const char **refspec)
 652{
 653        return parse_refspec_internal(nr_refspec, refspec, 0, 0);
 654}
 655
 656void free_refspec(int nr_refspec, struct refspec *refspec)
 657{
 658        int i;
 659        for (i = 0; i < nr_refspec; i++) {
 660                free(refspec[i].src);
 661                free(refspec[i].dst);
 662        }
 663        free(refspec);
 664}
 665
 666static int valid_remote_nick(const char *name)
 667{
 668        if (!name[0] || is_dot_or_dotdot(name))
 669                return 0;
 670        return !strchr(name, '/'); /* no slash */
 671}
 672
 673struct remote *remote_get(const char *name)
 674{
 675        struct remote *ret;
 676        int name_given = 0;
 677
 678        read_config();
 679        if (name)
 680                name_given = 1;
 681        else {
 682                name = default_remote_name;
 683                name_given = explicit_default_remote_name;
 684        }
 685
 686        ret = make_remote(name, 0);
 687        if (valid_remote_nick(name)) {
 688                if (!valid_remote(ret))
 689                        read_remotes_file(ret);
 690                if (!valid_remote(ret))
 691                        read_branches_file(ret);
 692        }
 693        if (name_given && !valid_remote(ret))
 694                add_url_alias(ret, name);
 695        if (!valid_remote(ret))
 696                return NULL;
 697        ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
 698        ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
 699        return ret;
 700}
 701
 702int remote_is_configured(const char *name)
 703{
 704        int i;
 705        read_config();
 706
 707        for (i = 0; i < remotes_nr; i++)
 708                if (!strcmp(name, remotes[i]->name))
 709                        return 1;
 710        return 0;
 711}
 712
 713int for_each_remote(each_remote_fn fn, void *priv)
 714{
 715        int i, result = 0;
 716        read_config();
 717        for (i = 0; i < remotes_nr && !result; i++) {
 718                struct remote *r = remotes[i];
 719                if (!r)
 720                        continue;
 721                if (!r->fetch)
 722                        r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
 723                                                       r->fetch_refspec);
 724                if (!r->push)
 725                        r->push = parse_push_refspec(r->push_refspec_nr,
 726                                                     r->push_refspec);
 727                result = fn(r, priv);
 728        }
 729        return result;
 730}
 731
 732void ref_remove_duplicates(struct ref *ref_map)
 733{
 734        struct string_list refs = STRING_LIST_INIT_NODUP;
 735        struct string_list_item *item = NULL;
 736        struct ref *prev = NULL, *next = NULL;
 737        for (; ref_map; prev = ref_map, ref_map = next) {
 738                next = ref_map->next;
 739                if (!ref_map->peer_ref)
 740                        continue;
 741
 742                item = string_list_lookup(&refs, ref_map->peer_ref->name);
 743                if (item) {
 744                        if (strcmp(((struct ref *)item->util)->name,
 745                                   ref_map->name))
 746                                die("%s tracks both %s and %s",
 747                                    ref_map->peer_ref->name,
 748                                    ((struct ref *)item->util)->name,
 749                                    ref_map->name);
 750                        prev->next = ref_map->next;
 751                        free(ref_map->peer_ref);
 752                        free(ref_map);
 753                        ref_map = prev; /* skip this; we freed it */
 754                        continue;
 755                }
 756
 757                item = string_list_insert(&refs, ref_map->peer_ref->name);
 758                item->util = ref_map;
 759        }
 760        string_list_clear(&refs, 0);
 761}
 762
 763int remote_has_url(struct remote *remote, const char *url)
 764{
 765        int i;
 766        for (i = 0; i < remote->url_nr; i++) {
 767                if (!strcmp(remote->url[i], url))
 768                        return 1;
 769        }
 770        return 0;
 771}
 772
 773static int match_name_with_pattern(const char *key, const char *name,
 774                                   const char *value, char **result)
 775{
 776        const char *kstar = strchr(key, '*');
 777        size_t klen;
 778        size_t ksuffixlen;
 779        size_t namelen;
 780        int ret;
 781        if (!kstar)
 782                die("Key '%s' of pattern had no '*'", key);
 783        klen = kstar - key;
 784        ksuffixlen = strlen(kstar + 1);
 785        namelen = strlen(name);
 786        ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
 787                !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
 788        if (ret && value) {
 789                const char *vstar = strchr(value, '*');
 790                size_t vlen;
 791                size_t vsuffixlen;
 792                if (!vstar)
 793                        die("Value '%s' of pattern has no '*'", value);
 794                vlen = vstar - value;
 795                vsuffixlen = strlen(vstar + 1);
 796                *result = xmalloc(vlen + vsuffixlen +
 797                                  strlen(name) -
 798                                  klen - ksuffixlen + 1);
 799                strncpy(*result, value, vlen);
 800                strncpy(*result + vlen,
 801                        name + klen, namelen - klen - ksuffixlen);
 802                strcpy(*result + vlen + namelen - klen - ksuffixlen,
 803                       vstar + 1);
 804        }
 805        return ret;
 806}
 807
 808static int query_refspecs(struct refspec *refs, int ref_count, struct refspec *query)
 809{
 810        int i;
 811        int find_src = !query->src;
 812
 813        if (find_src && !query->dst)
 814                return error("query_refspecs: need either src or dst");
 815
 816        for (i = 0; i < ref_count; i++) {
 817                struct refspec *refspec = &refs[i];
 818                const char *key = find_src ? refspec->dst : refspec->src;
 819                const char *value = find_src ? refspec->src : refspec->dst;
 820                const char *needle = find_src ? query->dst : query->src;
 821                char **result = find_src ? &query->src : &query->dst;
 822
 823                if (!refspec->dst)
 824                        continue;
 825                if (refspec->pattern) {
 826                        if (match_name_with_pattern(key, needle, value, result)) {
 827                                query->force = refspec->force;
 828                                return 0;
 829                        }
 830                } else if (!strcmp(needle, key)) {
 831                        *result = xstrdup(value);
 832                        query->force = refspec->force;
 833                        return 0;
 834                }
 835        }
 836        return -1;
 837}
 838
 839char *apply_refspecs(struct refspec *refspecs, int nr_refspec,
 840                     const char *name)
 841{
 842        struct refspec query;
 843
 844        memset(&query, 0, sizeof(struct refspec));
 845        query.src = (char *)name;
 846
 847        if (query_refspecs(refspecs, nr_refspec, &query))
 848                return NULL;
 849
 850        return query.dst;
 851}
 852
 853int remote_find_tracking(struct remote *remote, struct refspec *refspec)
 854{
 855        return query_refspecs(remote->fetch, remote->fetch_refspec_nr, refspec);
 856}
 857
 858static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
 859                const char *name)
 860{
 861        size_t len = strlen(name);
 862        struct ref *ref = xcalloc(1, sizeof(struct ref) + prefixlen + len + 1);
 863        memcpy(ref->name, prefix, prefixlen);
 864        memcpy(ref->name + prefixlen, name, len);
 865        return ref;
 866}
 867
 868struct ref *alloc_ref(const char *name)
 869{
 870        return alloc_ref_with_prefix("", 0, name);
 871}
 872
 873struct ref *copy_ref(const struct ref *ref)
 874{
 875        struct ref *cpy;
 876        size_t len;
 877        if (!ref)
 878                return NULL;
 879        len = strlen(ref->name);
 880        cpy = xmalloc(sizeof(struct ref) + len + 1);
 881        memcpy(cpy, ref, sizeof(struct ref) + len + 1);
 882        cpy->next = NULL;
 883        cpy->symref = ref->symref ? xstrdup(ref->symref) : NULL;
 884        cpy->remote_status = ref->remote_status ? xstrdup(ref->remote_status) : NULL;
 885        cpy->peer_ref = copy_ref(ref->peer_ref);
 886        return cpy;
 887}
 888
 889struct ref *copy_ref_list(const struct ref *ref)
 890{
 891        struct ref *ret = NULL;
 892        struct ref **tail = &ret;
 893        while (ref) {
 894                *tail = copy_ref(ref);
 895                ref = ref->next;
 896                tail = &((*tail)->next);
 897        }
 898        return ret;
 899}
 900
 901static void free_ref(struct ref *ref)
 902{
 903        if (!ref)
 904                return;
 905        free_ref(ref->peer_ref);
 906        free(ref->remote_status);
 907        free(ref->symref);
 908        free(ref);
 909}
 910
 911void free_refs(struct ref *ref)
 912{
 913        struct ref *next;
 914        while (ref) {
 915                next = ref->next;
 916                free_ref(ref);
 917                ref = next;
 918        }
 919}
 920
 921static int count_refspec_match(const char *pattern,
 922                               struct ref *refs,
 923                               struct ref **matched_ref)
 924{
 925        int patlen = strlen(pattern);
 926        struct ref *matched_weak = NULL;
 927        struct ref *matched = NULL;
 928        int weak_match = 0;
 929        int match = 0;
 930
 931        for (weak_match = match = 0; refs; refs = refs->next) {
 932                char *name = refs->name;
 933                int namelen = strlen(name);
 934
 935                if (!refname_match(pattern, name, ref_rev_parse_rules))
 936                        continue;
 937
 938                /* A match is "weak" if it is with refs outside
 939                 * heads or tags, and did not specify the pattern
 940                 * in full (e.g. "refs/remotes/origin/master") or at
 941                 * least from the toplevel (e.g. "remotes/origin/master");
 942                 * otherwise "git push $URL master" would result in
 943                 * ambiguity between remotes/origin/master and heads/master
 944                 * at the remote site.
 945                 */
 946                if (namelen != patlen &&
 947                    patlen != namelen - 5 &&
 948                    prefixcmp(name, "refs/heads/") &&
 949                    prefixcmp(name, "refs/tags/")) {
 950                        /* We want to catch the case where only weak
 951                         * matches are found and there are multiple
 952                         * matches, and where more than one strong
 953                         * matches are found, as ambiguous.  One
 954                         * strong match with zero or more weak matches
 955                         * are acceptable as a unique match.
 956                         */
 957                        matched_weak = refs;
 958                        weak_match++;
 959                }
 960                else {
 961                        matched = refs;
 962                        match++;
 963                }
 964        }
 965        if (!matched) {
 966                *matched_ref = matched_weak;
 967                return weak_match;
 968        }
 969        else {
 970                *matched_ref = matched;
 971                return match;
 972        }
 973}
 974
 975static void tail_link_ref(struct ref *ref, struct ref ***tail)
 976{
 977        **tail = ref;
 978        while (ref->next)
 979                ref = ref->next;
 980        *tail = &ref->next;
 981}
 982
 983static struct ref *alloc_delete_ref(void)
 984{
 985        struct ref *ref = alloc_ref("(delete)");
 986        hashclr(ref->new_sha1);
 987        return ref;
 988}
 989
 990static struct ref *try_explicit_object_name(const char *name)
 991{
 992        unsigned char sha1[20];
 993        struct ref *ref;
 994
 995        if (!*name)
 996                return alloc_delete_ref();
 997        if (get_sha1(name, sha1))
 998                return NULL;
 999        ref = alloc_ref(name);
1000        hashcpy(ref->new_sha1, sha1);
1001        return ref;
1002}
1003
1004static struct ref *make_linked_ref(const char *name, struct ref ***tail)
1005{
1006        struct ref *ret = alloc_ref(name);
1007        tail_link_ref(ret, tail);
1008        return ret;
1009}
1010
1011static char *guess_ref(const char *name, struct ref *peer)
1012{
1013        struct strbuf buf = STRBUF_INIT;
1014        unsigned char sha1[20];
1015
1016        const char *r = resolve_ref_unsafe(peer->name, sha1, 1, NULL);
1017        if (!r)
1018                return NULL;
1019
1020        if (!prefixcmp(r, "refs/heads/"))
1021                strbuf_addstr(&buf, "refs/heads/");
1022        else if (!prefixcmp(r, "refs/tags/"))
1023                strbuf_addstr(&buf, "refs/tags/");
1024        else
1025                return NULL;
1026
1027        strbuf_addstr(&buf, name);
1028        return strbuf_detach(&buf, NULL);
1029}
1030
1031static int match_explicit(struct ref *src, struct ref *dst,
1032                          struct ref ***dst_tail,
1033                          struct refspec *rs)
1034{
1035        struct ref *matched_src, *matched_dst;
1036        int copy_src;
1037
1038        const char *dst_value = rs->dst;
1039        char *dst_guess;
1040
1041        if (rs->pattern || rs->matching)
1042                return 0;
1043
1044        matched_src = matched_dst = NULL;
1045        switch (count_refspec_match(rs->src, src, &matched_src)) {
1046        case 1:
1047                copy_src = 1;
1048                break;
1049        case 0:
1050                /* The source could be in the get_sha1() format
1051                 * not a reference name.  :refs/other is a
1052                 * way to delete 'other' ref at the remote end.
1053                 */
1054                matched_src = try_explicit_object_name(rs->src);
1055                if (!matched_src)
1056                        return error("src refspec %s does not match any.", rs->src);
1057                copy_src = 0;
1058                break;
1059        default:
1060                return error("src refspec %s matches more than one.", rs->src);
1061        }
1062
1063        if (!dst_value) {
1064                unsigned char sha1[20];
1065                int flag;
1066
1067                dst_value = resolve_ref_unsafe(matched_src->name, sha1, 1, &flag);
1068                if (!dst_value ||
1069                    ((flag & REF_ISSYMREF) &&
1070                     prefixcmp(dst_value, "refs/heads/")))
1071                        die("%s cannot be resolved to branch.",
1072                            matched_src->name);
1073        }
1074
1075        switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1076        case 1:
1077                break;
1078        case 0:
1079                if (!memcmp(dst_value, "refs/", 5))
1080                        matched_dst = make_linked_ref(dst_value, dst_tail);
1081                else if ((dst_guess = guess_ref(dst_value, matched_src)))
1082                        matched_dst = make_linked_ref(dst_guess, dst_tail);
1083                else
1084                        error("unable to push to unqualified destination: %s\n"
1085                              "The destination refspec neither matches an "
1086                              "existing ref on the remote nor\n"
1087                              "begins with refs/, and we are unable to "
1088                              "guess a prefix based on the source ref.",
1089                              dst_value);
1090                break;
1091        default:
1092                matched_dst = NULL;
1093                error("dst refspec %s matches more than one.",
1094                      dst_value);
1095                break;
1096        }
1097        if (!matched_dst)
1098                return -1;
1099        if (matched_dst->peer_ref)
1100                return error("dst ref %s receives from more than one src.",
1101                      matched_dst->name);
1102        else {
1103                matched_dst->peer_ref = copy_src ? copy_ref(matched_src) : matched_src;
1104                matched_dst->force = rs->force;
1105        }
1106        return 0;
1107}
1108
1109static int match_explicit_refs(struct ref *src, struct ref *dst,
1110                               struct ref ***dst_tail, struct refspec *rs,
1111                               int rs_nr)
1112{
1113        int i, errs;
1114        for (i = errs = 0; i < rs_nr; i++)
1115                errs += match_explicit(src, dst, dst_tail, &rs[i]);
1116        return errs;
1117}
1118
1119static char *get_ref_match(const struct refspec *rs, int rs_nr, const struct ref *ref,
1120                int send_mirror, int direction, const struct refspec **ret_pat)
1121{
1122        const struct refspec *pat;
1123        char *name;
1124        int i;
1125        int matching_refs = -1;
1126        for (i = 0; i < rs_nr; i++) {
1127                if (rs[i].matching &&
1128                    (matching_refs == -1 || rs[i].force)) {
1129                        matching_refs = i;
1130                        continue;
1131                }
1132
1133                if (rs[i].pattern) {
1134                        const char *dst_side = rs[i].dst ? rs[i].dst : rs[i].src;
1135                        int match;
1136                        if (direction == FROM_SRC)
1137                                match = match_name_with_pattern(rs[i].src, ref->name, dst_side, &name);
1138                        else
1139                                match = match_name_with_pattern(dst_side, ref->name, rs[i].src, &name);
1140                        if (match) {
1141                                matching_refs = i;
1142                                break;
1143                        }
1144                }
1145        }
1146        if (matching_refs == -1)
1147                return NULL;
1148
1149        pat = rs + matching_refs;
1150        if (pat->matching) {
1151                /*
1152                 * "matching refs"; traditionally we pushed everything
1153                 * including refs outside refs/heads/ hierarchy, but
1154                 * that does not make much sense these days.
1155                 */
1156                if (!send_mirror && prefixcmp(ref->name, "refs/heads/"))
1157                        return NULL;
1158                name = xstrdup(ref->name);
1159        }
1160        if (ret_pat)
1161                *ret_pat = pat;
1162        return name;
1163}
1164
1165static struct ref **tail_ref(struct ref **head)
1166{
1167        struct ref **tail = head;
1168        while (*tail)
1169                tail = &((*tail)->next);
1170        return tail;
1171}
1172
1173/*
1174 * Given the set of refs the local repository has, the set of refs the
1175 * remote repository has, and the refspec used for push, determine
1176 * what remote refs we will update and with what value by setting
1177 * peer_ref (which object is being pushed) and force (if the push is
1178 * forced) in elements of "dst". The function may add new elements to
1179 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
1180 */
1181int match_push_refs(struct ref *src, struct ref **dst,
1182                    int nr_refspec, const char **refspec, int flags)
1183{
1184        struct refspec *rs;
1185        int send_all = flags & MATCH_REFS_ALL;
1186        int send_mirror = flags & MATCH_REFS_MIRROR;
1187        int send_prune = flags & MATCH_REFS_PRUNE;
1188        int errs;
1189        static const char *default_refspec[] = { ":", NULL };
1190        struct ref *ref, **dst_tail = tail_ref(dst);
1191
1192        if (!nr_refspec) {
1193                nr_refspec = 1;
1194                refspec = default_refspec;
1195        }
1196        rs = parse_push_refspec(nr_refspec, (const char **) refspec);
1197        errs = match_explicit_refs(src, *dst, &dst_tail, rs, nr_refspec);
1198
1199        /* pick the remainder */
1200        for (ref = src; ref; ref = ref->next) {
1201                struct ref *dst_peer;
1202                const struct refspec *pat = NULL;
1203                char *dst_name;
1204
1205                if (ref->peer_ref)
1206                        continue;
1207
1208                dst_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_SRC, &pat);
1209                if (!dst_name)
1210                        continue;
1211
1212                dst_peer = find_ref_by_name(*dst, dst_name);
1213                if (dst_peer) {
1214                        if (dst_peer->peer_ref)
1215                                /* We're already sending something to this ref. */
1216                                goto free_name;
1217                } else {
1218                        if (pat->matching && !(send_all || send_mirror))
1219                                /*
1220                                 * Remote doesn't have it, and we have no
1221                                 * explicit pattern, and we don't have
1222                                 * --all nor --mirror.
1223                                 */
1224                                goto free_name;
1225
1226                        /* Create a new one and link it */
1227                        dst_peer = make_linked_ref(dst_name, &dst_tail);
1228                        hashcpy(dst_peer->new_sha1, ref->new_sha1);
1229                }
1230                dst_peer->peer_ref = copy_ref(ref);
1231                dst_peer->force = pat->force;
1232        free_name:
1233                free(dst_name);
1234        }
1235        if (send_prune) {
1236                /* check for missing refs on the remote */
1237                for (ref = *dst; ref; ref = ref->next) {
1238                        char *src_name;
1239
1240                        if (ref->peer_ref)
1241                                /* We're already sending something to this ref. */
1242                                continue;
1243
1244                        src_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_DST, NULL);
1245                        if (src_name) {
1246                                if (!find_ref_by_name(src, src_name))
1247                                        ref->peer_ref = alloc_delete_ref();
1248                                free(src_name);
1249                        }
1250                }
1251        }
1252        if (errs)
1253                return -1;
1254        return 0;
1255}
1256
1257void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1258        int force_update)
1259{
1260        struct ref *ref;
1261
1262        for (ref = remote_refs; ref; ref = ref->next) {
1263                if (ref->peer_ref)
1264                        hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
1265                else if (!send_mirror)
1266                        continue;
1267
1268                ref->deletion = is_null_sha1(ref->new_sha1);
1269                if (!ref->deletion &&
1270                        !hashcmp(ref->old_sha1, ref->new_sha1)) {
1271                        ref->status = REF_STATUS_UPTODATE;
1272                        continue;
1273                }
1274
1275                /* This part determines what can overwrite what.
1276                 * The rules are:
1277                 *
1278                 * (0) you can always use --force or +A:B notation to
1279                 *     selectively force individual ref pairs.
1280                 *
1281                 * (1) if the old thing does not exist, it is OK.
1282                 *
1283                 * (2) if you do not have the old thing, you are not allowed
1284                 *     to overwrite it; you would not know what you are losing
1285                 *     otherwise.
1286                 *
1287                 * (3) if both new and old are commit-ish, and new is a
1288                 *     descendant of old, it is OK.
1289                 *
1290                 * (4) regardless of all of the above, removing :B is
1291                 *     always allowed.
1292                 */
1293
1294                ref->nonfastforward =
1295                        !ref->deletion &&
1296                        !is_null_sha1(ref->old_sha1) &&
1297                        (!has_sha1_file(ref->old_sha1)
1298                          || !ref_newer(ref->new_sha1, ref->old_sha1));
1299
1300                if (ref->nonfastforward && !ref->force && !force_update) {
1301                        ref->status = REF_STATUS_REJECT_NONFASTFORWARD;
1302                        continue;
1303                }
1304        }
1305}
1306
1307struct branch *branch_get(const char *name)
1308{
1309        struct branch *ret;
1310
1311        read_config();
1312        if (!name || !*name || !strcmp(name, "HEAD"))
1313                ret = current_branch;
1314        else
1315                ret = make_branch(name, 0);
1316        if (ret && ret->remote_name) {
1317                ret->remote = remote_get(ret->remote_name);
1318                if (ret->merge_nr) {
1319                        int i;
1320                        ret->merge = xcalloc(sizeof(*ret->merge),
1321                                             ret->merge_nr);
1322                        for (i = 0; i < ret->merge_nr; i++) {
1323                                ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1324                                ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1325                                if (remote_find_tracking(ret->remote, ret->merge[i])
1326                                    && !strcmp(ret->remote_name, "."))
1327                                        ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1328                        }
1329                }
1330        }
1331        return ret;
1332}
1333
1334int branch_has_merge_config(struct branch *branch)
1335{
1336        return branch && !!branch->merge;
1337}
1338
1339int branch_merge_matches(struct branch *branch,
1340                                 int i,
1341                                 const char *refname)
1342{
1343        if (!branch || i < 0 || i >= branch->merge_nr)
1344                return 0;
1345        return refname_match(branch->merge[i]->src, refname, ref_fetch_rules);
1346}
1347
1348static struct ref *get_expanded_map(const struct ref *remote_refs,
1349                                    const struct refspec *refspec)
1350{
1351        const struct ref *ref;
1352        struct ref *ret = NULL;
1353        struct ref **tail = &ret;
1354
1355        char *expn_name;
1356
1357        for (ref = remote_refs; ref; ref = ref->next) {
1358                if (strchr(ref->name, '^'))
1359                        continue; /* a dereference item */
1360                if (match_name_with_pattern(refspec->src, ref->name,
1361                                            refspec->dst, &expn_name)) {
1362                        struct ref *cpy = copy_ref(ref);
1363
1364                        cpy->peer_ref = alloc_ref(expn_name);
1365                        free(expn_name);
1366                        if (refspec->force)
1367                                cpy->peer_ref->force = 1;
1368                        *tail = cpy;
1369                        tail = &cpy->next;
1370                }
1371        }
1372
1373        return ret;
1374}
1375
1376static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1377{
1378        const struct ref *ref;
1379        for (ref = refs; ref; ref = ref->next) {
1380                if (refname_match(name, ref->name, ref_fetch_rules))
1381                        return ref;
1382        }
1383        return NULL;
1384}
1385
1386struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1387{
1388        const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1389
1390        if (!ref)
1391                return NULL;
1392
1393        return copy_ref(ref);
1394}
1395
1396static struct ref *get_local_ref(const char *name)
1397{
1398        if (!name || name[0] == '\0')
1399                return NULL;
1400
1401        if (!prefixcmp(name, "refs/"))
1402                return alloc_ref(name);
1403
1404        if (!prefixcmp(name, "heads/") ||
1405            !prefixcmp(name, "tags/") ||
1406            !prefixcmp(name, "remotes/"))
1407                return alloc_ref_with_prefix("refs/", 5, name);
1408
1409        return alloc_ref_with_prefix("refs/heads/", 11, name);
1410}
1411
1412int get_fetch_map(const struct ref *remote_refs,
1413                  const struct refspec *refspec,
1414                  struct ref ***tail,
1415                  int missing_ok)
1416{
1417        struct ref *ref_map, **rmp;
1418
1419        if (refspec->pattern) {
1420                ref_map = get_expanded_map(remote_refs, refspec);
1421        } else {
1422                const char *name = refspec->src[0] ? refspec->src : "HEAD";
1423
1424                ref_map = get_remote_ref(remote_refs, name);
1425                if (!missing_ok && !ref_map)
1426                        die("Couldn't find remote ref %s", name);
1427                if (ref_map) {
1428                        ref_map->peer_ref = get_local_ref(refspec->dst);
1429                        if (ref_map->peer_ref && refspec->force)
1430                                ref_map->peer_ref->force = 1;
1431                }
1432        }
1433
1434        for (rmp = &ref_map; *rmp; ) {
1435                if ((*rmp)->peer_ref) {
1436                        if (check_refname_format((*rmp)->peer_ref->name + 5,
1437                                REFNAME_ALLOW_ONELEVEL)) {
1438                                struct ref *ignore = *rmp;
1439                                error("* Ignoring funny ref '%s' locally",
1440                                      (*rmp)->peer_ref->name);
1441                                *rmp = (*rmp)->next;
1442                                free(ignore->peer_ref);
1443                                free(ignore);
1444                                continue;
1445                        }
1446                }
1447                rmp = &((*rmp)->next);
1448        }
1449
1450        if (ref_map)
1451                tail_link_ref(ref_map, tail);
1452
1453        return 0;
1454}
1455
1456int resolve_remote_symref(struct ref *ref, struct ref *list)
1457{
1458        if (!ref->symref)
1459                return 0;
1460        for (; list; list = list->next)
1461                if (!strcmp(ref->symref, list->name)) {
1462                        hashcpy(ref->old_sha1, list->old_sha1);
1463                        return 0;
1464                }
1465        return 1;
1466}
1467
1468static void unmark_and_free(struct commit_list *list, unsigned int mark)
1469{
1470        while (list) {
1471                struct commit_list *temp = list;
1472                temp->item->object.flags &= ~mark;
1473                list = temp->next;
1474                free(temp);
1475        }
1476}
1477
1478int ref_newer(const unsigned char *new_sha1, const unsigned char *old_sha1)
1479{
1480        struct object *o;
1481        struct commit *old, *new;
1482        struct commit_list *list, *used;
1483        int found = 0;
1484
1485        /* Both new and old must be commit-ish and new is descendant of
1486         * old.  Otherwise we require --force.
1487         */
1488        o = deref_tag(parse_object(old_sha1), NULL, 0);
1489        if (!o || o->type != OBJ_COMMIT)
1490                return 0;
1491        old = (struct commit *) o;
1492
1493        o = deref_tag(parse_object(new_sha1), NULL, 0);
1494        if (!o || o->type != OBJ_COMMIT)
1495                return 0;
1496        new = (struct commit *) o;
1497
1498        if (parse_commit(new) < 0)
1499                return 0;
1500
1501        used = list = NULL;
1502        commit_list_insert(new, &list);
1503        while (list) {
1504                new = pop_most_recent_commit(&list, TMP_MARK);
1505                commit_list_insert(new, &used);
1506                if (new == old) {
1507                        found = 1;
1508                        break;
1509                }
1510        }
1511        unmark_and_free(list, TMP_MARK);
1512        unmark_and_free(used, TMP_MARK);
1513        return found;
1514}
1515
1516/*
1517 * Return true if there is anything to report, otherwise false.
1518 */
1519int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs)
1520{
1521        unsigned char sha1[20];
1522        struct commit *ours, *theirs;
1523        char symmetric[84];
1524        struct rev_info revs;
1525        const char *rev_argv[10], *base;
1526        int rev_argc;
1527
1528        /*
1529         * Nothing to report unless we are marked to build on top of
1530         * somebody else.
1531         */
1532        if (!branch ||
1533            !branch->merge || !branch->merge[0] || !branch->merge[0]->dst)
1534                return 0;
1535
1536        /*
1537         * If what we used to build on no longer exists, there is
1538         * nothing to report.
1539         */
1540        base = branch->merge[0]->dst;
1541        if (read_ref(base, sha1))
1542                return 0;
1543        theirs = lookup_commit_reference(sha1);
1544        if (!theirs)
1545                return 0;
1546
1547        if (read_ref(branch->refname, sha1))
1548                return 0;
1549        ours = lookup_commit_reference(sha1);
1550        if (!ours)
1551                return 0;
1552
1553        /* are we the same? */
1554        if (theirs == ours)
1555                return 0;
1556
1557        /* Run "rev-list --left-right ours...theirs" internally... */
1558        rev_argc = 0;
1559        rev_argv[rev_argc++] = NULL;
1560        rev_argv[rev_argc++] = "--left-right";
1561        rev_argv[rev_argc++] = symmetric;
1562        rev_argv[rev_argc++] = "--";
1563        rev_argv[rev_argc] = NULL;
1564
1565        strcpy(symmetric, sha1_to_hex(ours->object.sha1));
1566        strcpy(symmetric + 40, "...");
1567        strcpy(symmetric + 43, sha1_to_hex(theirs->object.sha1));
1568
1569        init_revisions(&revs, NULL);
1570        setup_revisions(rev_argc, rev_argv, &revs, NULL);
1571        prepare_revision_walk(&revs);
1572
1573        /* ... and count the commits on each side. */
1574        *num_ours = 0;
1575        *num_theirs = 0;
1576        while (1) {
1577                struct commit *c = get_revision(&revs);
1578                if (!c)
1579                        break;
1580                if (c->object.flags & SYMMETRIC_LEFT)
1581                        (*num_ours)++;
1582                else
1583                        (*num_theirs)++;
1584        }
1585
1586        /* clear object flags smudged by the above traversal */
1587        clear_commit_marks(ours, ALL_REV_FLAGS);
1588        clear_commit_marks(theirs, ALL_REV_FLAGS);
1589        return 1;
1590}
1591
1592/*
1593 * Return true when there is anything to report, otherwise false.
1594 */
1595int format_tracking_info(struct branch *branch, struct strbuf *sb)
1596{
1597        int num_ours, num_theirs;
1598        const char *base;
1599
1600        if (!stat_tracking_info(branch, &num_ours, &num_theirs))
1601                return 0;
1602
1603        base = branch->merge[0]->dst;
1604        base = shorten_unambiguous_ref(base, 0);
1605        if (!num_theirs)
1606                strbuf_addf(sb,
1607                        Q_("Your branch is ahead of '%s' by %d commit.\n",
1608                           "Your branch is ahead of '%s' by %d commits.\n",
1609                           num_ours),
1610                        base, num_ours);
1611        else if (!num_ours)
1612                strbuf_addf(sb,
1613                        Q_("Your branch is behind '%s' by %d commit, "
1614                               "and can be fast-forwarded.\n",
1615                           "Your branch is behind '%s' by %d commits, "
1616                               "and can be fast-forwarded.\n",
1617                           num_theirs),
1618                        base, num_theirs);
1619        else
1620                strbuf_addf(sb,
1621                        Q_("Your branch and '%s' have diverged,\n"
1622                               "and have %d and %d different commit each, "
1623                               "respectively.\n",
1624                           "Your branch and '%s' have diverged,\n"
1625                               "and have %d and %d different commits each, "
1626                               "respectively.\n",
1627                           num_theirs),
1628                        base, num_ours, num_theirs);
1629        return 1;
1630}
1631
1632static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
1633{
1634        struct ref ***local_tail = cb_data;
1635        struct ref *ref;
1636        int len;
1637
1638        /* we already know it starts with refs/ to get here */
1639        if (check_refname_format(refname + 5, 0))
1640                return 0;
1641
1642        len = strlen(refname) + 1;
1643        ref = xcalloc(1, sizeof(*ref) + len);
1644        hashcpy(ref->new_sha1, sha1);
1645        memcpy(ref->name, refname, len);
1646        **local_tail = ref;
1647        *local_tail = &ref->next;
1648        return 0;
1649}
1650
1651struct ref *get_local_heads(void)
1652{
1653        struct ref *local_refs = NULL, **local_tail = &local_refs;
1654        for_each_ref(one_local_ref, &local_tail);
1655        return local_refs;
1656}
1657
1658struct ref *guess_remote_head(const struct ref *head,
1659                              const struct ref *refs,
1660                              int all)
1661{
1662        const struct ref *r;
1663        struct ref *list = NULL;
1664        struct ref **tail = &list;
1665
1666        if (!head)
1667                return NULL;
1668
1669        /*
1670         * Some transports support directly peeking at
1671         * where HEAD points; if that is the case, then
1672         * we don't have to guess.
1673         */
1674        if (head->symref)
1675                return copy_ref(find_ref_by_name(refs, head->symref));
1676
1677        /* If refs/heads/master could be right, it is. */
1678        if (!all) {
1679                r = find_ref_by_name(refs, "refs/heads/master");
1680                if (r && !hashcmp(r->old_sha1, head->old_sha1))
1681                        return copy_ref(r);
1682        }
1683
1684        /* Look for another ref that points there */
1685        for (r = refs; r; r = r->next) {
1686                if (r != head &&
1687                    !prefixcmp(r->name, "refs/heads/") &&
1688                    !hashcmp(r->old_sha1, head->old_sha1)) {
1689                        *tail = copy_ref(r);
1690                        tail = &((*tail)->next);
1691                        if (!all)
1692                                break;
1693                }
1694        }
1695
1696        return list;
1697}
1698
1699struct stale_heads_info {
1700        struct string_list *ref_names;
1701        struct ref **stale_refs_tail;
1702        struct refspec *refs;
1703        int ref_count;
1704};
1705
1706static int get_stale_heads_cb(const char *refname,
1707        const unsigned char *sha1, int flags, void *cb_data)
1708{
1709        struct stale_heads_info *info = cb_data;
1710        struct refspec query;
1711        memset(&query, 0, sizeof(struct refspec));
1712        query.dst = (char *)refname;
1713
1714        if (query_refspecs(info->refs, info->ref_count, &query))
1715                return 0; /* No matches */
1716
1717        /*
1718         * If we did find a suitable refspec and it's not a symref and
1719         * it's not in the list of refs that currently exist in that
1720         * remote we consider it to be stale.
1721         */
1722        if (!((flags & REF_ISSYMREF) ||
1723              string_list_has_string(info->ref_names, query.src))) {
1724                struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
1725                hashcpy(ref->new_sha1, sha1);
1726        }
1727
1728        free(query.src);
1729        return 0;
1730}
1731
1732struct ref *get_stale_heads(struct refspec *refs, int ref_count, struct ref *fetch_map)
1733{
1734        struct ref *ref, *stale_refs = NULL;
1735        struct string_list ref_names = STRING_LIST_INIT_NODUP;
1736        struct stale_heads_info info;
1737        info.ref_names = &ref_names;
1738        info.stale_refs_tail = &stale_refs;
1739        info.refs = refs;
1740        info.ref_count = ref_count;
1741        for (ref = fetch_map; ref; ref = ref->next)
1742                string_list_append(&ref_names, ref->name);
1743        sort_string_list(&ref_names);
1744        for_each_ref(get_stale_heads_cb, &info);
1745        string_list_clear(&ref_names, 0);
1746        return stale_refs;
1747}