remote.con commit Merge branch 'ss/blame-textconv-fake-working-tree' (92622e6)
   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
  11static struct refspec s_tag_refspec = {
  12        0,
  13        1,
  14        0,
  15        "refs/tags/*",
  16        "refs/tags/*"
  17};
  18
  19const struct refspec *tag_refspec = &s_tag_refspec;
  20
  21struct counted_string {
  22        size_t len;
  23        const char *s;
  24};
  25struct rewrite {
  26        const char *base;
  27        size_t baselen;
  28        struct counted_string *instead_of;
  29        int instead_of_nr;
  30        int instead_of_alloc;
  31};
  32struct rewrites {
  33        struct rewrite **rewrite;
  34        int rewrite_alloc;
  35        int rewrite_nr;
  36};
  37
  38static struct remote **remotes;
  39static int remotes_alloc;
  40static int remotes_nr;
  41
  42static struct branch **branches;
  43static int branches_alloc;
  44static int branches_nr;
  45
  46static struct branch *current_branch;
  47static const char *default_remote_name;
  48static int explicit_default_remote_name;
  49
  50static struct rewrites rewrites;
  51static struct rewrites rewrites_push;
  52
  53#define BUF_SIZE (2048)
  54static char buffer[BUF_SIZE];
  55
  56static int valid_remote(const struct remote *remote)
  57{
  58        return (!!remote->url) || (!!remote->foreign_vcs);
  59}
  60
  61static const char *alias_url(const char *url, struct rewrites *r)
  62{
  63        int i, j;
  64        char *ret;
  65        struct counted_string *longest;
  66        int longest_i;
  67
  68        longest = NULL;
  69        longest_i = -1;
  70        for (i = 0; i < r->rewrite_nr; i++) {
  71                if (!r->rewrite[i])
  72                        continue;
  73                for (j = 0; j < r->rewrite[i]->instead_of_nr; j++) {
  74                        if (!prefixcmp(url, r->rewrite[i]->instead_of[j].s) &&
  75                            (!longest ||
  76                             longest->len < r->rewrite[i]->instead_of[j].len)) {
  77                                longest = &(r->rewrite[i]->instead_of[j]);
  78                                longest_i = i;
  79                        }
  80                }
  81        }
  82        if (!longest)
  83                return url;
  84
  85        ret = xmalloc(r->rewrite[longest_i]->baselen +
  86                     (strlen(url) - longest->len) + 1);
  87        strcpy(ret, r->rewrite[longest_i]->base);
  88        strcpy(ret + r->rewrite[longest_i]->baselen, url + longest->len);
  89        return ret;
  90}
  91
  92static void add_push_refspec(struct remote *remote, const char *ref)
  93{
  94        ALLOC_GROW(remote->push_refspec,
  95                   remote->push_refspec_nr + 1,
  96                   remote->push_refspec_alloc);
  97        remote->push_refspec[remote->push_refspec_nr++] = ref;
  98}
  99
 100static void add_fetch_refspec(struct remote *remote, const char *ref)
 101{
 102        ALLOC_GROW(remote->fetch_refspec,
 103                   remote->fetch_refspec_nr + 1,
 104                   remote->fetch_refspec_alloc);
 105        remote->fetch_refspec[remote->fetch_refspec_nr++] = ref;
 106}
 107
 108static void add_url(struct remote *remote, const char *url)
 109{
 110        ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
 111        remote->url[remote->url_nr++] = url;
 112}
 113
 114static void add_pushurl(struct remote *remote, const char *pushurl)
 115{
 116        ALLOC_GROW(remote->pushurl, remote->pushurl_nr + 1, remote->pushurl_alloc);
 117        remote->pushurl[remote->pushurl_nr++] = pushurl;
 118}
 119
 120static void add_pushurl_alias(struct remote *remote, const char *url)
 121{
 122        const char *pushurl = alias_url(url, &rewrites_push);
 123        if (pushurl != url)
 124                add_pushurl(remote, pushurl);
 125}
 126
 127static void add_url_alias(struct remote *remote, const char *url)
 128{
 129        add_url(remote, alias_url(url, &rewrites));
 130        add_pushurl_alias(remote, url);
 131}
 132
 133static struct remote *make_remote(const char *name, int len)
 134{
 135        struct remote *ret;
 136        int i;
 137
 138        for (i = 0; i < remotes_nr; i++) {
 139                if (len ? (!strncmp(name, remotes[i]->name, len) &&
 140                           !remotes[i]->name[len]) :
 141                    !strcmp(name, remotes[i]->name))
 142                        return remotes[i];
 143        }
 144
 145        ret = xcalloc(1, sizeof(struct remote));
 146        ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
 147        remotes[remotes_nr++] = ret;
 148        if (len)
 149                ret->name = xstrndup(name, len);
 150        else
 151                ret->name = xstrdup(name);
 152        return ret;
 153}
 154
 155static void add_merge(struct branch *branch, const char *name)
 156{
 157        ALLOC_GROW(branch->merge_name, branch->merge_nr + 1,
 158                   branch->merge_alloc);
 159        branch->merge_name[branch->merge_nr++] = name;
 160}
 161
 162static struct branch *make_branch(const char *name, int len)
 163{
 164        struct branch *ret;
 165        int i;
 166        char *refname;
 167
 168        for (i = 0; i < branches_nr; i++) {
 169                if (len ? (!strncmp(name, branches[i]->name, len) &&
 170                           !branches[i]->name[len]) :
 171                    !strcmp(name, branches[i]->name))
 172                        return branches[i];
 173        }
 174
 175        ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
 176        ret = xcalloc(1, sizeof(struct branch));
 177        branches[branches_nr++] = ret;
 178        if (len)
 179                ret->name = xstrndup(name, len);
 180        else
 181                ret->name = xstrdup(name);
 182        refname = xmalloc(strlen(name) + strlen("refs/heads/") + 1);
 183        strcpy(refname, "refs/heads/");
 184        strcpy(refname + strlen("refs/heads/"), ret->name);
 185        ret->refname = refname;
 186
 187        return ret;
 188}
 189
 190static struct rewrite *make_rewrite(struct rewrites *r, const char *base, int len)
 191{
 192        struct rewrite *ret;
 193        int i;
 194
 195        for (i = 0; i < r->rewrite_nr; i++) {
 196                if (len
 197                    ? (len == r->rewrite[i]->baselen &&
 198                       !strncmp(base, r->rewrite[i]->base, len))
 199                    : !strcmp(base, r->rewrite[i]->base))
 200                        return r->rewrite[i];
 201        }
 202
 203        ALLOC_GROW(r->rewrite, r->rewrite_nr + 1, r->rewrite_alloc);
 204        ret = xcalloc(1, sizeof(struct rewrite));
 205        r->rewrite[r->rewrite_nr++] = ret;
 206        if (len) {
 207                ret->base = xstrndup(base, len);
 208                ret->baselen = len;
 209        }
 210        else {
 211                ret->base = xstrdup(base);
 212                ret->baselen = strlen(base);
 213        }
 214        return ret;
 215}
 216
 217static void add_instead_of(struct rewrite *rewrite, const char *instead_of)
 218{
 219        ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
 220        rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
 221        rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
 222        rewrite->instead_of_nr++;
 223}
 224
 225static void read_remotes_file(struct remote *remote)
 226{
 227        FILE *f = fopen(git_path("remotes/%s", remote->name), "r");
 228
 229        if (!f)
 230                return;
 231        remote->origin = REMOTE_REMOTES;
 232        while (fgets(buffer, BUF_SIZE, f)) {
 233                int value_list;
 234                char *s, *p;
 235
 236                if (!prefixcmp(buffer, "URL:")) {
 237                        value_list = 0;
 238                        s = buffer + 4;
 239                } else if (!prefixcmp(buffer, "Push:")) {
 240                        value_list = 1;
 241                        s = buffer + 5;
 242                } else if (!prefixcmp(buffer, "Pull:")) {
 243                        value_list = 2;
 244                        s = buffer + 5;
 245                } else
 246                        continue;
 247
 248                while (isspace(*s))
 249                        s++;
 250                if (!*s)
 251                        continue;
 252
 253                p = s + strlen(s);
 254                while (isspace(p[-1]))
 255                        *--p = 0;
 256
 257                switch (value_list) {
 258                case 0:
 259                        add_url_alias(remote, xstrdup(s));
 260                        break;
 261                case 1:
 262                        add_push_refspec(remote, xstrdup(s));
 263                        break;
 264                case 2:
 265                        add_fetch_refspec(remote, xstrdup(s));
 266                        break;
 267                }
 268        }
 269        fclose(f);
 270}
 271
 272static void read_branches_file(struct remote *remote)
 273{
 274        const char *slash = strchr(remote->name, '/');
 275        char *frag;
 276        struct strbuf branch = STRBUF_INIT;
 277        int n = slash ? slash - remote->name : 1000;
 278        FILE *f = fopen(git_path("branches/%.*s", n, remote->name), "r");
 279        char *s, *p;
 280        int len;
 281
 282        if (!f)
 283                return;
 284        s = fgets(buffer, BUF_SIZE, f);
 285        fclose(f);
 286        if (!s)
 287                return;
 288        while (isspace(*s))
 289                s++;
 290        if (!*s)
 291                return;
 292        remote->origin = REMOTE_BRANCHES;
 293        p = s + strlen(s);
 294        while (isspace(p[-1]))
 295                *--p = 0;
 296        len = p - s;
 297        if (slash)
 298                len += strlen(slash);
 299        p = xmalloc(len + 1);
 300        strcpy(p, s);
 301        if (slash)
 302                strcat(p, slash);
 303
 304        /*
 305         * With "slash", e.g. "git fetch jgarzik/netdev-2.6" when
 306         * reading from $GIT_DIR/branches/jgarzik fetches "HEAD" from
 307         * the partial URL obtained from the branches file plus
 308         * "/netdev-2.6" and does not store it in any tracking ref.
 309         * #branch specifier in the file is ignored.
 310         *
 311         * Otherwise, the branches file would have URL and optionally
 312         * #branch specified.  The "master" (or specified) branch is
 313         * fetched and stored in the local branch of the same name.
 314         */
 315        frag = strchr(p, '#');
 316        if (frag) {
 317                *(frag++) = '\0';
 318                strbuf_addf(&branch, "refs/heads/%s", frag);
 319        } else
 320                strbuf_addstr(&branch, "refs/heads/master");
 321        if (!slash) {
 322                strbuf_addf(&branch, ":refs/heads/%s", remote->name);
 323        } else {
 324                strbuf_reset(&branch);
 325                strbuf_addstr(&branch, "HEAD:");
 326        }
 327        add_url_alias(remote, p);
 328        add_fetch_refspec(remote, strbuf_detach(&branch, NULL));
 329        /*
 330         * Cogito compatible push: push current HEAD to remote #branch
 331         * (master if missing)
 332         */
 333        strbuf_init(&branch, 0);
 334        strbuf_addstr(&branch, "HEAD");
 335        if (frag)
 336                strbuf_addf(&branch, ":refs/heads/%s", frag);
 337        else
 338                strbuf_addstr(&branch, ":refs/heads/master");
 339        add_push_refspec(remote, strbuf_detach(&branch, NULL));
 340        remote->fetch_tags = 1; /* always auto-follow */
 341}
 342
 343static int handle_config(const char *key, const char *value, void *cb)
 344{
 345        const char *name;
 346        const char *subkey;
 347        struct remote *remote;
 348        struct branch *branch;
 349        if (!prefixcmp(key, "branch.")) {
 350                name = key + 7;
 351                subkey = strrchr(name, '.');
 352                if (!subkey)
 353                        return 0;
 354                branch = make_branch(name, subkey - name);
 355                if (!strcmp(subkey, ".remote")) {
 356                        if (!value)
 357                                return config_error_nonbool(key);
 358                        branch->remote_name = xstrdup(value);
 359                        if (branch == current_branch) {
 360                                default_remote_name = branch->remote_name;
 361                                explicit_default_remote_name = 1;
 362                        }
 363                } else if (!strcmp(subkey, ".merge")) {
 364                        if (!value)
 365                                return config_error_nonbool(key);
 366                        add_merge(branch, xstrdup(value));
 367                }
 368                return 0;
 369        }
 370        if (!prefixcmp(key, "url.")) {
 371                struct rewrite *rewrite;
 372                name = key + 4;
 373                subkey = strrchr(name, '.');
 374                if (!subkey)
 375                        return 0;
 376                if (!strcmp(subkey, ".insteadof")) {
 377                        rewrite = make_rewrite(&rewrites, name, subkey - name);
 378                        if (!value)
 379                                return config_error_nonbool(key);
 380                        add_instead_of(rewrite, xstrdup(value));
 381                } else if (!strcmp(subkey, ".pushinsteadof")) {
 382                        rewrite = make_rewrite(&rewrites_push, name, subkey - name);
 383                        if (!value)
 384                                return config_error_nonbool(key);
 385                        add_instead_of(rewrite, xstrdup(value));
 386                }
 387        }
 388        if (prefixcmp(key,  "remote."))
 389                return 0;
 390        name = key + 7;
 391        if (*name == '/') {
 392                warning("Config remote shorthand cannot begin with '/': %s",
 393                        name);
 394                return 0;
 395        }
 396        subkey = strrchr(name, '.');
 397        if (!subkey)
 398                return 0;
 399        remote = make_remote(name, subkey - name);
 400        remote->origin = REMOTE_CONFIG;
 401        if (!strcmp(subkey, ".mirror"))
 402                remote->mirror = git_config_bool(key, value);
 403        else if (!strcmp(subkey, ".skipdefaultupdate"))
 404                remote->skip_default_update = git_config_bool(key, value);
 405        else if (!strcmp(subkey, ".skipfetchall"))
 406                remote->skip_default_update = git_config_bool(key, value);
 407        else if (!strcmp(subkey, ".url")) {
 408                const char *v;
 409                if (git_config_string(&v, key, value))
 410                        return -1;
 411                add_url(remote, v);
 412        } else if (!strcmp(subkey, ".pushurl")) {
 413                const char *v;
 414                if (git_config_string(&v, key, value))
 415                        return -1;
 416                add_pushurl(remote, v);
 417        } else if (!strcmp(subkey, ".push")) {
 418                const char *v;
 419                if (git_config_string(&v, key, value))
 420                        return -1;
 421                add_push_refspec(remote, v);
 422        } else if (!strcmp(subkey, ".fetch")) {
 423                const char *v;
 424                if (git_config_string(&v, key, value))
 425                        return -1;
 426                add_fetch_refspec(remote, v);
 427        } else if (!strcmp(subkey, ".receivepack")) {
 428                const char *v;
 429                if (git_config_string(&v, key, value))
 430                        return -1;
 431                if (!remote->receivepack)
 432                        remote->receivepack = v;
 433                else
 434                        error("more than one receivepack given, using the first");
 435        } else if (!strcmp(subkey, ".uploadpack")) {
 436                const char *v;
 437                if (git_config_string(&v, key, value))
 438                        return -1;
 439                if (!remote->uploadpack)
 440                        remote->uploadpack = v;
 441                else
 442                        error("more than one uploadpack given, using the first");
 443        } else if (!strcmp(subkey, ".tagopt")) {
 444                if (!strcmp(value, "--no-tags"))
 445                        remote->fetch_tags = -1;
 446                else if (!strcmp(value, "--tags"))
 447                        remote->fetch_tags = 2;
 448        } else if (!strcmp(subkey, ".proxy")) {
 449                return git_config_string((const char **)&remote->http_proxy,
 450                                         key, value);
 451        } else if (!strcmp(subkey, ".vcs")) {
 452                return git_config_string(&remote->foreign_vcs, key, value);
 453        }
 454        return 0;
 455}
 456
 457static void alias_all_urls(void)
 458{
 459        int i, j;
 460        for (i = 0; i < remotes_nr; i++) {
 461                int add_pushurl_aliases;
 462                if (!remotes[i])
 463                        continue;
 464                for (j = 0; j < remotes[i]->pushurl_nr; j++) {
 465                        remotes[i]->pushurl[j] = alias_url(remotes[i]->pushurl[j], &rewrites);
 466                }
 467                add_pushurl_aliases = remotes[i]->pushurl_nr == 0;
 468                for (j = 0; j < remotes[i]->url_nr; j++) {
 469                        if (add_pushurl_aliases)
 470                                add_pushurl_alias(remotes[i], remotes[i]->url[j]);
 471                        remotes[i]->url[j] = alias_url(remotes[i]->url[j], &rewrites);
 472                }
 473        }
 474}
 475
 476static void read_config(void)
 477{
 478        unsigned char sha1[20];
 479        const char *head_ref;
 480        int flag;
 481        if (default_remote_name) /* did this already */
 482                return;
 483        default_remote_name = xstrdup("origin");
 484        current_branch = NULL;
 485        head_ref = resolve_ref("HEAD", sha1, 0, &flag);
 486        if (head_ref && (flag & REF_ISSYMREF) &&
 487            !prefixcmp(head_ref, "refs/heads/")) {
 488                current_branch =
 489                        make_branch(head_ref + strlen("refs/heads/"), 0);
 490        }
 491        git_config(handle_config, NULL);
 492        alias_all_urls();
 493}
 494
 495/*
 496 * This function frees a refspec array.
 497 * Warning: code paths should be checked to ensure that the src
 498 *          and dst pointers are always freeable pointers as well
 499 *          as the refspec pointer itself.
 500 */
 501static void free_refspecs(struct refspec *refspec, int nr_refspec)
 502{
 503        int i;
 504
 505        if (!refspec)
 506                return;
 507
 508        for (i = 0; i < nr_refspec; i++) {
 509                free(refspec[i].src);
 510                free(refspec[i].dst);
 511        }
 512        free(refspec);
 513}
 514
 515static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
 516{
 517        int i;
 518        struct refspec *rs = xcalloc(sizeof(*rs), nr_refspec);
 519
 520        for (i = 0; i < nr_refspec; i++) {
 521                size_t llen;
 522                int is_glob;
 523                const char *lhs, *rhs;
 524                int flags;
 525
 526                is_glob = 0;
 527
 528                lhs = refspec[i];
 529                if (*lhs == '+') {
 530                        rs[i].force = 1;
 531                        lhs++;
 532                }
 533
 534                rhs = strrchr(lhs, ':');
 535
 536                /*
 537                 * Before going on, special case ":" (or "+:") as a refspec
 538                 * for matching refs.
 539                 */
 540                if (!fetch && rhs == lhs && rhs[1] == '\0') {
 541                        rs[i].matching = 1;
 542                        continue;
 543                }
 544
 545                if (rhs) {
 546                        size_t rlen = strlen(++rhs);
 547                        is_glob = (1 <= rlen && strchr(rhs, '*'));
 548                        rs[i].dst = xstrndup(rhs, rlen);
 549                }
 550
 551                llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
 552                if (1 <= llen && memchr(lhs, '*', llen)) {
 553                        if ((rhs && !is_glob) || (!rhs && fetch))
 554                                goto invalid;
 555                        is_glob = 1;
 556                } else if (rhs && is_glob) {
 557                        goto invalid;
 558                }
 559
 560                rs[i].pattern = is_glob;
 561                rs[i].src = xstrndup(lhs, llen);
 562                flags = REFNAME_ALLOW_ONELEVEL | (is_glob ? REFNAME_REFSPEC_PATTERN : 0);
 563
 564                if (fetch) {
 565                        /*
 566                         * LHS
 567                         * - empty is allowed; it means HEAD.
 568                         * - otherwise it must be a valid looking ref.
 569                         */
 570                        if (!*rs[i].src)
 571                                ; /* empty is ok */
 572                        else if (check_refname_format(rs[i].src, flags))
 573                                goto invalid;
 574                        /*
 575                         * RHS
 576                         * - missing is ok, and is same as empty.
 577                         * - empty is ok; it means not to store.
 578                         * - otherwise it must be a valid looking ref.
 579                         */
 580                        if (!rs[i].dst)
 581                                ; /* ok */
 582                        else if (!*rs[i].dst)
 583                                ; /* ok */
 584                        else if (check_refname_format(rs[i].dst, flags))
 585                                goto invalid;
 586                } else {
 587                        /*
 588                         * LHS
 589                         * - empty is allowed; it means delete.
 590                         * - when wildcarded, it must be a valid looking ref.
 591                         * - otherwise, it must be an extended SHA-1, but
 592                         *   there is no existing way to validate this.
 593                         */
 594                        if (!*rs[i].src)
 595                                ; /* empty is ok */
 596                        else if (is_glob) {
 597                                if (check_refname_format(rs[i].src, flags))
 598                                        goto invalid;
 599                        }
 600                        else
 601                                ; /* anything goes, for now */
 602                        /*
 603                         * RHS
 604                         * - missing is allowed, but LHS then must be a
 605                         *   valid looking ref.
 606                         * - empty is not allowed.
 607                         * - otherwise it must be a valid looking ref.
 608                         */
 609                        if (!rs[i].dst) {
 610                                if (check_refname_format(rs[i].src, flags))
 611                                        goto invalid;
 612                        } else if (!*rs[i].dst) {
 613                                goto invalid;
 614                        } else {
 615                                if (check_refname_format(rs[i].dst, flags))
 616                                        goto invalid;
 617                        }
 618                }
 619        }
 620        return rs;
 621
 622 invalid:
 623        if (verify) {
 624                /*
 625                 * nr_refspec must be greater than zero and i must be valid
 626                 * since it is only possible to reach this point from within
 627                 * the for loop above.
 628                 */
 629                free_refspecs(rs, i+1);
 630                return NULL;
 631        }
 632        die("Invalid refspec '%s'", refspec[i]);
 633}
 634
 635int valid_fetch_refspec(const char *fetch_refspec_str)
 636{
 637        struct refspec *refspec;
 638
 639        refspec = parse_refspec_internal(1, &fetch_refspec_str, 1, 1);
 640        free_refspecs(refspec, 1);
 641        return !!refspec;
 642}
 643
 644struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec)
 645{
 646        return parse_refspec_internal(nr_refspec, refspec, 1, 0);
 647}
 648
 649static struct refspec *parse_push_refspec(int nr_refspec, const char **refspec)
 650{
 651        return parse_refspec_internal(nr_refspec, refspec, 0, 0);
 652}
 653
 654void free_refspec(int nr_refspec, struct refspec *refspec)
 655{
 656        int i;
 657        for (i = 0; i < nr_refspec; i++) {
 658                free(refspec[i].src);
 659                free(refspec[i].dst);
 660        }
 661        free(refspec);
 662}
 663
 664static int valid_remote_nick(const char *name)
 665{
 666        if (!name[0] || is_dot_or_dotdot(name))
 667                return 0;
 668        return !strchr(name, '/'); /* no slash */
 669}
 670
 671struct remote *remote_get(const char *name)
 672{
 673        struct remote *ret;
 674        int name_given = 0;
 675
 676        read_config();
 677        if (name)
 678                name_given = 1;
 679        else {
 680                name = default_remote_name;
 681                name_given = explicit_default_remote_name;
 682        }
 683
 684        ret = make_remote(name, 0);
 685        if (valid_remote_nick(name)) {
 686                if (!valid_remote(ret))
 687                        read_remotes_file(ret);
 688                if (!valid_remote(ret))
 689                        read_branches_file(ret);
 690        }
 691        if (name_given && !valid_remote(ret))
 692                add_url_alias(ret, name);
 693        if (!valid_remote(ret))
 694                return NULL;
 695        ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
 696        ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
 697        return ret;
 698}
 699
 700int remote_is_configured(const char *name)
 701{
 702        int i;
 703        read_config();
 704
 705        for (i = 0; i < remotes_nr; i++)
 706                if (!strcmp(name, remotes[i]->name))
 707                        return 1;
 708        return 0;
 709}
 710
 711int for_each_remote(each_remote_fn fn, void *priv)
 712{
 713        int i, result = 0;
 714        read_config();
 715        for (i = 0; i < remotes_nr && !result; i++) {
 716                struct remote *r = remotes[i];
 717                if (!r)
 718                        continue;
 719                if (!r->fetch)
 720                        r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
 721                                                       r->fetch_refspec);
 722                if (!r->push)
 723                        r->push = parse_push_refspec(r->push_refspec_nr,
 724                                                     r->push_refspec);
 725                result = fn(r, priv);
 726        }
 727        return result;
 728}
 729
 730void ref_remove_duplicates(struct ref *ref_map)
 731{
 732        struct string_list refs = STRING_LIST_INIT_NODUP;
 733        struct string_list_item *item = NULL;
 734        struct ref *prev = NULL, *next = NULL;
 735        for (; ref_map; prev = ref_map, ref_map = next) {
 736                next = ref_map->next;
 737                if (!ref_map->peer_ref)
 738                        continue;
 739
 740                item = string_list_lookup(&refs, ref_map->peer_ref->name);
 741                if (item) {
 742                        if (strcmp(((struct ref *)item->util)->name,
 743                                   ref_map->name))
 744                                die("%s tracks both %s and %s",
 745                                    ref_map->peer_ref->name,
 746                                    ((struct ref *)item->util)->name,
 747                                    ref_map->name);
 748                        prev->next = ref_map->next;
 749                        free(ref_map->peer_ref);
 750                        free(ref_map);
 751                        ref_map = prev; /* skip this; we freed it */
 752                        continue;
 753                }
 754
 755                item = string_list_insert(&refs, ref_map->peer_ref->name);
 756                item->util = ref_map;
 757        }
 758        string_list_clear(&refs, 0);
 759}
 760
 761int remote_has_url(struct remote *remote, const char *url)
 762{
 763        int i;
 764        for (i = 0; i < remote->url_nr; i++) {
 765                if (!strcmp(remote->url[i], url))
 766                        return 1;
 767        }
 768        return 0;
 769}
 770
 771static int match_name_with_pattern(const char *key, const char *name,
 772                                   const char *value, char **result)
 773{
 774        const char *kstar = strchr(key, '*');
 775        size_t klen;
 776        size_t ksuffixlen;
 777        size_t namelen;
 778        int ret;
 779        if (!kstar)
 780                die("Key '%s' of pattern had no '*'", key);
 781        klen = kstar - key;
 782        ksuffixlen = strlen(kstar + 1);
 783        namelen = strlen(name);
 784        ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
 785                !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
 786        if (ret && value) {
 787                const char *vstar = strchr(value, '*');
 788                size_t vlen;
 789                size_t vsuffixlen;
 790                if (!vstar)
 791                        die("Value '%s' of pattern has no '*'", value);
 792                vlen = vstar - value;
 793                vsuffixlen = strlen(vstar + 1);
 794                *result = xmalloc(vlen + vsuffixlen +
 795                                  strlen(name) -
 796                                  klen - ksuffixlen + 1);
 797                strncpy(*result, value, vlen);
 798                strncpy(*result + vlen,
 799                        name + klen, namelen - klen - ksuffixlen);
 800                strcpy(*result + vlen + namelen - klen - ksuffixlen,
 801                       vstar + 1);
 802        }
 803        return ret;
 804}
 805
 806static int query_refspecs(struct refspec *refs, int ref_count, struct refspec *query)
 807{
 808        int i;
 809        int find_src = !query->src;
 810
 811        if (find_src && !query->dst)
 812                return error("query_refspecs: need either src or dst");
 813
 814        for (i = 0; i < ref_count; i++) {
 815                struct refspec *refspec = &refs[i];
 816                const char *key = find_src ? refspec->dst : refspec->src;
 817                const char *value = find_src ? refspec->src : refspec->dst;
 818                const char *needle = find_src ? query->dst : query->src;
 819                char **result = find_src ? &query->src : &query->dst;
 820
 821                if (!refspec->dst)
 822                        continue;
 823                if (refspec->pattern) {
 824                        if (match_name_with_pattern(key, needle, value, result)) {
 825                                query->force = refspec->force;
 826                                return 0;
 827                        }
 828                } else if (!strcmp(needle, key)) {
 829                        *result = xstrdup(value);
 830                        query->force = refspec->force;
 831                        return 0;
 832                }
 833        }
 834        return -1;
 835}
 836
 837char *apply_refspecs(struct refspec *refspecs, int nr_refspec,
 838                     const char *name)
 839{
 840        struct refspec query;
 841
 842        memset(&query, 0, sizeof(struct refspec));
 843        query.src = (char *)name;
 844
 845        if (query_refspecs(refspecs, nr_refspec, &query))
 846                return NULL;
 847
 848        return query.dst;
 849}
 850
 851int remote_find_tracking(struct remote *remote, struct refspec *refspec)
 852{
 853        return query_refspecs(remote->fetch, remote->fetch_refspec_nr, refspec);
 854}
 855
 856static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
 857                const char *name)
 858{
 859        size_t len = strlen(name);
 860        struct ref *ref = xcalloc(1, sizeof(struct ref) + prefixlen + len + 1);
 861        memcpy(ref->name, prefix, prefixlen);
 862        memcpy(ref->name + prefixlen, name, len);
 863        return ref;
 864}
 865
 866struct ref *alloc_ref(const char *name)
 867{
 868        return alloc_ref_with_prefix("", 0, name);
 869}
 870
 871struct ref *copy_ref(const struct ref *ref)
 872{
 873        struct ref *cpy;
 874        size_t len;
 875        if (!ref)
 876                return NULL;
 877        len = strlen(ref->name);
 878        cpy = xmalloc(sizeof(struct ref) + len + 1);
 879        memcpy(cpy, ref, sizeof(struct ref) + len + 1);
 880        cpy->next = NULL;
 881        cpy->symref = ref->symref ? xstrdup(ref->symref) : NULL;
 882        cpy->remote_status = ref->remote_status ? xstrdup(ref->remote_status) : NULL;
 883        cpy->peer_ref = copy_ref(ref->peer_ref);
 884        return cpy;
 885}
 886
 887struct ref *copy_ref_list(const struct ref *ref)
 888{
 889        struct ref *ret = NULL;
 890        struct ref **tail = &ret;
 891        while (ref) {
 892                *tail = copy_ref(ref);
 893                ref = ref->next;
 894                tail = &((*tail)->next);
 895        }
 896        return ret;
 897}
 898
 899static void free_ref(struct ref *ref)
 900{
 901        if (!ref)
 902                return;
 903        free_ref(ref->peer_ref);
 904        free(ref->remote_status);
 905        free(ref->symref);
 906        free(ref);
 907}
 908
 909void free_refs(struct ref *ref)
 910{
 911        struct ref *next;
 912        while (ref) {
 913                next = ref->next;
 914                free_ref(ref);
 915                ref = next;
 916        }
 917}
 918
 919static int count_refspec_match(const char *pattern,
 920                               struct ref *refs,
 921                               struct ref **matched_ref)
 922{
 923        int patlen = strlen(pattern);
 924        struct ref *matched_weak = NULL;
 925        struct ref *matched = NULL;
 926        int weak_match = 0;
 927        int match = 0;
 928
 929        for (weak_match = match = 0; refs; refs = refs->next) {
 930                char *name = refs->name;
 931                int namelen = strlen(name);
 932
 933                if (!refname_match(pattern, name, ref_rev_parse_rules))
 934                        continue;
 935
 936                /* A match is "weak" if it is with refs outside
 937                 * heads or tags, and did not specify the pattern
 938                 * in full (e.g. "refs/remotes/origin/master") or at
 939                 * least from the toplevel (e.g. "remotes/origin/master");
 940                 * otherwise "git push $URL master" would result in
 941                 * ambiguity between remotes/origin/master and heads/master
 942                 * at the remote site.
 943                 */
 944                if (namelen != patlen &&
 945                    patlen != namelen - 5 &&
 946                    prefixcmp(name, "refs/heads/") &&
 947                    prefixcmp(name, "refs/tags/")) {
 948                        /* We want to catch the case where only weak
 949                         * matches are found and there are multiple
 950                         * matches, and where more than one strong
 951                         * matches are found, as ambiguous.  One
 952                         * strong match with zero or more weak matches
 953                         * are acceptable as a unique match.
 954                         */
 955                        matched_weak = refs;
 956                        weak_match++;
 957                }
 958                else {
 959                        matched = refs;
 960                        match++;
 961                }
 962        }
 963        if (!matched) {
 964                *matched_ref = matched_weak;
 965                return weak_match;
 966        }
 967        else {
 968                *matched_ref = matched;
 969                return match;
 970        }
 971}
 972
 973static void tail_link_ref(struct ref *ref, struct ref ***tail)
 974{
 975        **tail = ref;
 976        while (ref->next)
 977                ref = ref->next;
 978        *tail = &ref->next;
 979}
 980
 981static struct ref *try_explicit_object_name(const char *name)
 982{
 983        unsigned char sha1[20];
 984        struct ref *ref;
 985
 986        if (!*name) {
 987                ref = alloc_ref("(delete)");
 988                hashclr(ref->new_sha1);
 989                return ref;
 990        }
 991        if (get_sha1(name, sha1))
 992                return NULL;
 993        ref = alloc_ref(name);
 994        hashcpy(ref->new_sha1, sha1);
 995        return ref;
 996}
 997
 998static struct ref *make_linked_ref(const char *name, struct ref ***tail)
 999{
1000        struct ref *ret = alloc_ref(name);
1001        tail_link_ref(ret, tail);
1002        return ret;
1003}
1004
1005static char *guess_ref(const char *name, struct ref *peer)
1006{
1007        struct strbuf buf = STRBUF_INIT;
1008        unsigned char sha1[20];
1009
1010        const char *r = resolve_ref(peer->name, sha1, 1, NULL);
1011        if (!r)
1012                return NULL;
1013
1014        if (!prefixcmp(r, "refs/heads/"))
1015                strbuf_addstr(&buf, "refs/heads/");
1016        else if (!prefixcmp(r, "refs/tags/"))
1017                strbuf_addstr(&buf, "refs/tags/");
1018        else
1019                return NULL;
1020
1021        strbuf_addstr(&buf, name);
1022        return strbuf_detach(&buf, NULL);
1023}
1024
1025static int match_explicit(struct ref *src, struct ref *dst,
1026                          struct ref ***dst_tail,
1027                          struct refspec *rs)
1028{
1029        struct ref *matched_src, *matched_dst;
1030        int copy_src;
1031
1032        const char *dst_value = rs->dst;
1033        char *dst_guess;
1034
1035        if (rs->pattern || rs->matching)
1036                return 0;
1037
1038        matched_src = matched_dst = NULL;
1039        switch (count_refspec_match(rs->src, src, &matched_src)) {
1040        case 1:
1041                copy_src = 1;
1042                break;
1043        case 0:
1044                /* The source could be in the get_sha1() format
1045                 * not a reference name.  :refs/other is a
1046                 * way to delete 'other' ref at the remote end.
1047                 */
1048                matched_src = try_explicit_object_name(rs->src);
1049                if (!matched_src)
1050                        return error("src refspec %s does not match any.", rs->src);
1051                copy_src = 0;
1052                break;
1053        default:
1054                return error("src refspec %s matches more than one.", rs->src);
1055        }
1056
1057        if (!dst_value) {
1058                unsigned char sha1[20];
1059                int flag;
1060
1061                dst_value = resolve_ref(matched_src->name, sha1, 1, &flag);
1062                if (!dst_value ||
1063                    ((flag & REF_ISSYMREF) &&
1064                     prefixcmp(dst_value, "refs/heads/")))
1065                        die("%s cannot be resolved to branch.",
1066                            matched_src->name);
1067        }
1068
1069        switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1070        case 1:
1071                break;
1072        case 0:
1073                if (!memcmp(dst_value, "refs/", 5))
1074                        matched_dst = make_linked_ref(dst_value, dst_tail);
1075                else if ((dst_guess = guess_ref(dst_value, matched_src)))
1076                        matched_dst = make_linked_ref(dst_guess, dst_tail);
1077                else
1078                        error("unable to push to unqualified destination: %s\n"
1079                              "The destination refspec neither matches an "
1080                              "existing ref on the remote nor\n"
1081                              "begins with refs/, and we are unable to "
1082                              "guess a prefix based on the source ref.",
1083                              dst_value);
1084                break;
1085        default:
1086                matched_dst = NULL;
1087                error("dst refspec %s matches more than one.",
1088                      dst_value);
1089                break;
1090        }
1091        if (!matched_dst)
1092                return -1;
1093        if (matched_dst->peer_ref)
1094                return error("dst ref %s receives from more than one src.",
1095                      matched_dst->name);
1096        else {
1097                matched_dst->peer_ref = copy_src ? copy_ref(matched_src) : matched_src;
1098                matched_dst->force = rs->force;
1099        }
1100        return 0;
1101}
1102
1103static int match_explicit_refs(struct ref *src, struct ref *dst,
1104                               struct ref ***dst_tail, struct refspec *rs,
1105                               int rs_nr)
1106{
1107        int i, errs;
1108        for (i = errs = 0; i < rs_nr; i++)
1109                errs += match_explicit(src, dst, dst_tail, &rs[i]);
1110        return errs;
1111}
1112
1113static const struct refspec *check_pattern_match(const struct refspec *rs,
1114                                                 int rs_nr,
1115                                                 const struct ref *src)
1116{
1117        int i;
1118        int matching_refs = -1;
1119        for (i = 0; i < rs_nr; i++) {
1120                if (rs[i].matching &&
1121                    (matching_refs == -1 || rs[i].force)) {
1122                        matching_refs = i;
1123                        continue;
1124                }
1125
1126                if (rs[i].pattern && match_name_with_pattern(rs[i].src, src->name,
1127                                                             NULL, NULL))
1128                        return rs + i;
1129        }
1130        if (matching_refs != -1)
1131                return rs + matching_refs;
1132        else
1133                return NULL;
1134}
1135
1136static struct ref **tail_ref(struct ref **head)
1137{
1138        struct ref **tail = head;
1139        while (*tail)
1140                tail = &((*tail)->next);
1141        return tail;
1142}
1143
1144/*
1145 * Given the set of refs the local repository has, the set of refs the
1146 * remote repository has, and the refspec used for push, determine
1147 * what remote refs we will update and with what value by setting
1148 * peer_ref (which object is being pushed) and force (if the push is
1149 * forced) in elements of "dst". The function may add new elements to
1150 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
1151 */
1152int match_push_refs(struct ref *src, struct ref **dst,
1153                    int nr_refspec, const char **refspec, int flags)
1154{
1155        struct refspec *rs;
1156        int send_all = flags & MATCH_REFS_ALL;
1157        int send_mirror = flags & MATCH_REFS_MIRROR;
1158        int errs;
1159        static const char *default_refspec[] = { ":", NULL };
1160        struct ref **dst_tail = tail_ref(dst);
1161
1162        if (!nr_refspec) {
1163                nr_refspec = 1;
1164                refspec = default_refspec;
1165        }
1166        rs = parse_push_refspec(nr_refspec, (const char **) refspec);
1167        errs = match_explicit_refs(src, *dst, &dst_tail, rs, nr_refspec);
1168
1169        /* pick the remainder */
1170        for ( ; src; src = src->next) {
1171                struct ref *dst_peer;
1172                const struct refspec *pat = NULL;
1173                char *dst_name;
1174                if (src->peer_ref)
1175                        continue;
1176
1177                pat = check_pattern_match(rs, nr_refspec, src);
1178                if (!pat)
1179                        continue;
1180
1181                if (pat->matching) {
1182                        /*
1183                         * "matching refs"; traditionally we pushed everything
1184                         * including refs outside refs/heads/ hierarchy, but
1185                         * that does not make much sense these days.
1186                         */
1187                        if (!send_mirror && prefixcmp(src->name, "refs/heads/"))
1188                                continue;
1189                        dst_name = xstrdup(src->name);
1190
1191                } else {
1192                        const char *dst_side = pat->dst ? pat->dst : pat->src;
1193                        if (!match_name_with_pattern(pat->src, src->name,
1194                                                     dst_side, &dst_name))
1195                                die("Didn't think it matches any more");
1196                }
1197                dst_peer = find_ref_by_name(*dst, dst_name);
1198                if (dst_peer) {
1199                        if (dst_peer->peer_ref)
1200                                /* We're already sending something to this ref. */
1201                                goto free_name;
1202
1203                } else {
1204                        if (pat->matching && !(send_all || send_mirror))
1205                                /*
1206                                 * Remote doesn't have it, and we have no
1207                                 * explicit pattern, and we don't have
1208                                 * --all nor --mirror.
1209                                 */
1210                                goto free_name;
1211
1212                        /* Create a new one and link it */
1213                        dst_peer = make_linked_ref(dst_name, &dst_tail);
1214                        hashcpy(dst_peer->new_sha1, src->new_sha1);
1215                }
1216                dst_peer->peer_ref = copy_ref(src);
1217                dst_peer->force = pat->force;
1218        free_name:
1219                free(dst_name);
1220        }
1221        if (errs)
1222                return -1;
1223        return 0;
1224}
1225
1226void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1227        int force_update)
1228{
1229        struct ref *ref;
1230
1231        for (ref = remote_refs; ref; ref = ref->next) {
1232                if (ref->peer_ref)
1233                        hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
1234                else if (!send_mirror)
1235                        continue;
1236
1237                ref->deletion = is_null_sha1(ref->new_sha1);
1238                if (!ref->deletion &&
1239                        !hashcmp(ref->old_sha1, ref->new_sha1)) {
1240                        ref->status = REF_STATUS_UPTODATE;
1241                        continue;
1242                }
1243
1244                /* This part determines what can overwrite what.
1245                 * The rules are:
1246                 *
1247                 * (0) you can always use --force or +A:B notation to
1248                 *     selectively force individual ref pairs.
1249                 *
1250                 * (1) if the old thing does not exist, it is OK.
1251                 *
1252                 * (2) if you do not have the old thing, you are not allowed
1253                 *     to overwrite it; you would not know what you are losing
1254                 *     otherwise.
1255                 *
1256                 * (3) if both new and old are commit-ish, and new is a
1257                 *     descendant of old, it is OK.
1258                 *
1259                 * (4) regardless of all of the above, removing :B is
1260                 *     always allowed.
1261                 */
1262
1263                ref->nonfastforward =
1264                        !ref->deletion &&
1265                        !is_null_sha1(ref->old_sha1) &&
1266                        (!has_sha1_file(ref->old_sha1)
1267                          || !ref_newer(ref->new_sha1, ref->old_sha1));
1268
1269                if (ref->nonfastforward && !ref->force && !force_update) {
1270                        ref->status = REF_STATUS_REJECT_NONFASTFORWARD;
1271                        continue;
1272                }
1273        }
1274}
1275
1276struct branch *branch_get(const char *name)
1277{
1278        struct branch *ret;
1279
1280        read_config();
1281        if (!name || !*name || !strcmp(name, "HEAD"))
1282                ret = current_branch;
1283        else
1284                ret = make_branch(name, 0);
1285        if (ret && ret->remote_name) {
1286                ret->remote = remote_get(ret->remote_name);
1287                if (ret->merge_nr) {
1288                        int i;
1289                        ret->merge = xcalloc(sizeof(*ret->merge),
1290                                             ret->merge_nr);
1291                        for (i = 0; i < ret->merge_nr; i++) {
1292                                ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1293                                ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1294                                if (remote_find_tracking(ret->remote, ret->merge[i])
1295                                    && !strcmp(ret->remote_name, "."))
1296                                        ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1297                        }
1298                }
1299        }
1300        return ret;
1301}
1302
1303int branch_has_merge_config(struct branch *branch)
1304{
1305        return branch && !!branch->merge;
1306}
1307
1308int branch_merge_matches(struct branch *branch,
1309                                 int i,
1310                                 const char *refname)
1311{
1312        if (!branch || i < 0 || i >= branch->merge_nr)
1313                return 0;
1314        return refname_match(branch->merge[i]->src, refname, ref_fetch_rules);
1315}
1316
1317static struct ref *get_expanded_map(const struct ref *remote_refs,
1318                                    const struct refspec *refspec)
1319{
1320        const struct ref *ref;
1321        struct ref *ret = NULL;
1322        struct ref **tail = &ret;
1323
1324        char *expn_name;
1325
1326        for (ref = remote_refs; ref; ref = ref->next) {
1327                if (strchr(ref->name, '^'))
1328                        continue; /* a dereference item */
1329                if (match_name_with_pattern(refspec->src, ref->name,
1330                                            refspec->dst, &expn_name)) {
1331                        struct ref *cpy = copy_ref(ref);
1332
1333                        cpy->peer_ref = alloc_ref(expn_name);
1334                        free(expn_name);
1335                        if (refspec->force)
1336                                cpy->peer_ref->force = 1;
1337                        *tail = cpy;
1338                        tail = &cpy->next;
1339                }
1340        }
1341
1342        return ret;
1343}
1344
1345static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1346{
1347        const struct ref *ref;
1348        for (ref = refs; ref; ref = ref->next) {
1349                if (refname_match(name, ref->name, ref_fetch_rules))
1350                        return ref;
1351        }
1352        return NULL;
1353}
1354
1355struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1356{
1357        const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1358
1359        if (!ref)
1360                return NULL;
1361
1362        return copy_ref(ref);
1363}
1364
1365static struct ref *get_local_ref(const char *name)
1366{
1367        if (!name || name[0] == '\0')
1368                return NULL;
1369
1370        if (!prefixcmp(name, "refs/"))
1371                return alloc_ref(name);
1372
1373        if (!prefixcmp(name, "heads/") ||
1374            !prefixcmp(name, "tags/") ||
1375            !prefixcmp(name, "remotes/"))
1376                return alloc_ref_with_prefix("refs/", 5, name);
1377
1378        return alloc_ref_with_prefix("refs/heads/", 11, name);
1379}
1380
1381int get_fetch_map(const struct ref *remote_refs,
1382                  const struct refspec *refspec,
1383                  struct ref ***tail,
1384                  int missing_ok)
1385{
1386        struct ref *ref_map, **rmp;
1387
1388        if (refspec->pattern) {
1389                ref_map = get_expanded_map(remote_refs, refspec);
1390        } else {
1391                const char *name = refspec->src[0] ? refspec->src : "HEAD";
1392
1393                ref_map = get_remote_ref(remote_refs, name);
1394                if (!missing_ok && !ref_map)
1395                        die("Couldn't find remote ref %s", name);
1396                if (ref_map) {
1397                        ref_map->peer_ref = get_local_ref(refspec->dst);
1398                        if (ref_map->peer_ref && refspec->force)
1399                                ref_map->peer_ref->force = 1;
1400                }
1401        }
1402
1403        for (rmp = &ref_map; *rmp; ) {
1404                if ((*rmp)->peer_ref) {
1405                        if (check_refname_format((*rmp)->peer_ref->name + 5,
1406                                REFNAME_ALLOW_ONELEVEL)) {
1407                                struct ref *ignore = *rmp;
1408                                error("* Ignoring funny ref '%s' locally",
1409                                      (*rmp)->peer_ref->name);
1410                                *rmp = (*rmp)->next;
1411                                free(ignore->peer_ref);
1412                                free(ignore);
1413                                continue;
1414                        }
1415                }
1416                rmp = &((*rmp)->next);
1417        }
1418
1419        if (ref_map)
1420                tail_link_ref(ref_map, tail);
1421
1422        return 0;
1423}
1424
1425int resolve_remote_symref(struct ref *ref, struct ref *list)
1426{
1427        if (!ref->symref)
1428                return 0;
1429        for (; list; list = list->next)
1430                if (!strcmp(ref->symref, list->name)) {
1431                        hashcpy(ref->old_sha1, list->old_sha1);
1432                        return 0;
1433                }
1434        return 1;
1435}
1436
1437static void unmark_and_free(struct commit_list *list, unsigned int mark)
1438{
1439        while (list) {
1440                struct commit_list *temp = list;
1441                temp->item->object.flags &= ~mark;
1442                list = temp->next;
1443                free(temp);
1444        }
1445}
1446
1447int ref_newer(const unsigned char *new_sha1, const unsigned char *old_sha1)
1448{
1449        struct object *o;
1450        struct commit *old, *new;
1451        struct commit_list *list, *used;
1452        int found = 0;
1453
1454        /* Both new and old must be commit-ish and new is descendant of
1455         * old.  Otherwise we require --force.
1456         */
1457        o = deref_tag(parse_object(old_sha1), NULL, 0);
1458        if (!o || o->type != OBJ_COMMIT)
1459                return 0;
1460        old = (struct commit *) o;
1461
1462        o = deref_tag(parse_object(new_sha1), NULL, 0);
1463        if (!o || o->type != OBJ_COMMIT)
1464                return 0;
1465        new = (struct commit *) o;
1466
1467        if (parse_commit(new) < 0)
1468                return 0;
1469
1470        used = list = NULL;
1471        commit_list_insert(new, &list);
1472        while (list) {
1473                new = pop_most_recent_commit(&list, TMP_MARK);
1474                commit_list_insert(new, &used);
1475                if (new == old) {
1476                        found = 1;
1477                        break;
1478                }
1479        }
1480        unmark_and_free(list, TMP_MARK);
1481        unmark_and_free(used, TMP_MARK);
1482        return found;
1483}
1484
1485/*
1486 * Return true if there is anything to report, otherwise false.
1487 */
1488int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs)
1489{
1490        unsigned char sha1[20];
1491        struct commit *ours, *theirs;
1492        char symmetric[84];
1493        struct rev_info revs;
1494        const char *rev_argv[10], *base;
1495        int rev_argc;
1496
1497        /*
1498         * Nothing to report unless we are marked to build on top of
1499         * somebody else.
1500         */
1501        if (!branch ||
1502            !branch->merge || !branch->merge[0] || !branch->merge[0]->dst)
1503                return 0;
1504
1505        /*
1506         * If what we used to build on no longer exists, there is
1507         * nothing to report.
1508         */
1509        base = branch->merge[0]->dst;
1510        if (!resolve_ref(base, sha1, 1, NULL))
1511                return 0;
1512        theirs = lookup_commit_reference(sha1);
1513        if (!theirs)
1514                return 0;
1515
1516        if (!resolve_ref(branch->refname, sha1, 1, NULL))
1517                return 0;
1518        ours = lookup_commit_reference(sha1);
1519        if (!ours)
1520                return 0;
1521
1522        /* are we the same? */
1523        if (theirs == ours)
1524                return 0;
1525
1526        /* Run "rev-list --left-right ours...theirs" internally... */
1527        rev_argc = 0;
1528        rev_argv[rev_argc++] = NULL;
1529        rev_argv[rev_argc++] = "--left-right";
1530        rev_argv[rev_argc++] = symmetric;
1531        rev_argv[rev_argc++] = "--";
1532        rev_argv[rev_argc] = NULL;
1533
1534        strcpy(symmetric, sha1_to_hex(ours->object.sha1));
1535        strcpy(symmetric + 40, "...");
1536        strcpy(symmetric + 43, sha1_to_hex(theirs->object.sha1));
1537
1538        init_revisions(&revs, NULL);
1539        setup_revisions(rev_argc, rev_argv, &revs, NULL);
1540        prepare_revision_walk(&revs);
1541
1542        /* ... and count the commits on each side. */
1543        *num_ours = 0;
1544        *num_theirs = 0;
1545        while (1) {
1546                struct commit *c = get_revision(&revs);
1547                if (!c)
1548                        break;
1549                if (c->object.flags & SYMMETRIC_LEFT)
1550                        (*num_ours)++;
1551                else
1552                        (*num_theirs)++;
1553        }
1554
1555        /* clear object flags smudged by the above traversal */
1556        clear_commit_marks(ours, ALL_REV_FLAGS);
1557        clear_commit_marks(theirs, ALL_REV_FLAGS);
1558        return 1;
1559}
1560
1561/*
1562 * Return true when there is anything to report, otherwise false.
1563 */
1564int format_tracking_info(struct branch *branch, struct strbuf *sb)
1565{
1566        int num_ours, num_theirs;
1567        const char *base;
1568
1569        if (!stat_tracking_info(branch, &num_ours, &num_theirs))
1570                return 0;
1571
1572        base = branch->merge[0]->dst;
1573        base = shorten_unambiguous_ref(base, 0);
1574        if (!num_theirs)
1575                strbuf_addf(sb, "Your branch is ahead of '%s' "
1576                            "by %d commit%s.\n",
1577                            base, num_ours, (num_ours == 1) ? "" : "s");
1578        else if (!num_ours)
1579                strbuf_addf(sb, "Your branch is behind '%s' "
1580                            "by %d commit%s, "
1581                            "and can be fast-forwarded.\n",
1582                            base, num_theirs, (num_theirs == 1) ? "" : "s");
1583        else
1584                strbuf_addf(sb, "Your branch and '%s' have diverged,\n"
1585                            "and have %d and %d different commit(s) each, "
1586                            "respectively.\n",
1587                            base, num_ours, num_theirs);
1588        return 1;
1589}
1590
1591static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
1592{
1593        struct ref ***local_tail = cb_data;
1594        struct ref *ref;
1595        int len;
1596
1597        /* we already know it starts with refs/ to get here */
1598        if (check_refname_format(refname + 5, 0))
1599                return 0;
1600
1601        len = strlen(refname) + 1;
1602        ref = xcalloc(1, sizeof(*ref) + len);
1603        hashcpy(ref->new_sha1, sha1);
1604        memcpy(ref->name, refname, len);
1605        **local_tail = ref;
1606        *local_tail = &ref->next;
1607        return 0;
1608}
1609
1610struct ref *get_local_heads(void)
1611{
1612        struct ref *local_refs = NULL, **local_tail = &local_refs;
1613        for_each_ref(one_local_ref, &local_tail);
1614        return local_refs;
1615}
1616
1617struct ref *guess_remote_head(const struct ref *head,
1618                              const struct ref *refs,
1619                              int all)
1620{
1621        const struct ref *r;
1622        struct ref *list = NULL;
1623        struct ref **tail = &list;
1624
1625        if (!head)
1626                return NULL;
1627
1628        /*
1629         * Some transports support directly peeking at
1630         * where HEAD points; if that is the case, then
1631         * we don't have to guess.
1632         */
1633        if (head->symref)
1634                return copy_ref(find_ref_by_name(refs, head->symref));
1635
1636        /* If refs/heads/master could be right, it is. */
1637        if (!all) {
1638                r = find_ref_by_name(refs, "refs/heads/master");
1639                if (r && !hashcmp(r->old_sha1, head->old_sha1))
1640                        return copy_ref(r);
1641        }
1642
1643        /* Look for another ref that points there */
1644        for (r = refs; r; r = r->next) {
1645                if (r != head &&
1646                    !prefixcmp(r->name, "refs/heads/") &&
1647                    !hashcmp(r->old_sha1, head->old_sha1)) {
1648                        *tail = copy_ref(r);
1649                        tail = &((*tail)->next);
1650                        if (!all)
1651                                break;
1652                }
1653        }
1654
1655        return list;
1656}
1657
1658struct stale_heads_info {
1659        struct string_list *ref_names;
1660        struct ref **stale_refs_tail;
1661        struct refspec *refs;
1662        int ref_count;
1663};
1664
1665static int get_stale_heads_cb(const char *refname,
1666        const unsigned char *sha1, int flags, void *cb_data)
1667{
1668        struct stale_heads_info *info = cb_data;
1669        struct refspec query;
1670        memset(&query, 0, sizeof(struct refspec));
1671        query.dst = (char *)refname;
1672
1673        if (query_refspecs(info->refs, info->ref_count, &query))
1674                return 0; /* No matches */
1675
1676        /*
1677         * If we did find a suitable refspec and it's not a symref and
1678         * it's not in the list of refs that currently exist in that
1679         * remote we consider it to be stale.
1680         */
1681        if (!((flags & REF_ISSYMREF) ||
1682              string_list_has_string(info->ref_names, query.src))) {
1683                struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
1684                hashcpy(ref->new_sha1, sha1);
1685        }
1686
1687        free(query.src);
1688        return 0;
1689}
1690
1691struct ref *get_stale_heads(struct refspec *refs, int ref_count, struct ref *fetch_map)
1692{
1693        struct ref *ref, *stale_refs = NULL;
1694        struct string_list ref_names = STRING_LIST_INIT_NODUP;
1695        struct stale_heads_info info;
1696        info.ref_names = &ref_names;
1697        info.stale_refs_tail = &stale_refs;
1698        info.refs = refs;
1699        info.ref_count = ref_count;
1700        for (ref = fetch_map; ref; ref = ref->next)
1701                string_list_append(&ref_names, ref->name);
1702        sort_string_list(&ref_names);
1703        for_each_ref(get_stale_heads_cb, &info);
1704        string_list_clear(&ref_names, 0);
1705        return stale_refs;
1706}