Andrew's git / gitweb.git / remote.c
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remote.con commit tests: don't rely on strerror text when testing rmdir failure (11b5390)
   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#include "mergesort.h"
  11
  12enum map_direction { FROM_SRC, FROM_DST };
  13
  14static struct refspec s_tag_refspec = {
  15        0,
  16        1,
  17        0,
  18        0,
  19        "refs/tags/*",
  20        "refs/tags/*"
  21};
  22
  23const struct refspec *tag_refspec = &s_tag_refspec;
  24
  25struct counted_string {
  26        size_t len;
  27        const char *s;
  28};
  29struct rewrite {
  30        const char *base;
  31        size_t baselen;
  32        struct counted_string *instead_of;
  33        int instead_of_nr;
  34        int instead_of_alloc;
  35};
  36struct rewrites {
  37        struct rewrite **rewrite;
  38        int rewrite_alloc;
  39        int rewrite_nr;
  40};
  41
  42static struct remote **remotes;
  43static int remotes_alloc;
  44static int remotes_nr;
  45
  46static struct branch **branches;
  47static int branches_alloc;
  48static int branches_nr;
  49
  50static struct branch *current_branch;
  51static const char *default_remote_name;
  52static const char *pushremote_name;
  53static int explicit_default_remote_name;
  54
  55static struct rewrites rewrites;
  56static struct rewrites rewrites_push;
  57
  58#define BUF_SIZE (2048)
  59static char buffer[BUF_SIZE];
  60
  61static int valid_remote(const struct remote *remote)
  62{
  63        return (!!remote->url) || (!!remote->foreign_vcs);
  64}
  65
  66static const char *alias_url(const char *url, struct rewrites *r)
  67{
  68        int i, j;
  69        char *ret;
  70        struct counted_string *longest;
  71        int longest_i;
  72
  73        longest = NULL;
  74        longest_i = -1;
  75        for (i = 0; i < r->rewrite_nr; i++) {
  76                if (!r->rewrite[i])
  77                        continue;
  78                for (j = 0; j < r->rewrite[i]->instead_of_nr; j++) {
  79                        if (starts_with(url, r->rewrite[i]->instead_of[j].s) &&
  80                            (!longest ||
  81                             longest->len < r->rewrite[i]->instead_of[j].len)) {
  82                                longest = &(r->rewrite[i]->instead_of[j]);
  83                                longest_i = i;
  84                        }
  85                }
  86        }
  87        if (!longest)
  88                return url;
  89
  90        ret = xmalloc(r->rewrite[longest_i]->baselen +
  91                     (strlen(url) - longest->len) + 1);
  92        strcpy(ret, r->rewrite[longest_i]->base);
  93        strcpy(ret + r->rewrite[longest_i]->baselen, url + longest->len);
  94        return ret;
  95}
  96
  97static void add_push_refspec(struct remote *remote, const char *ref)
  98{
  99        ALLOC_GROW(remote->push_refspec,
 100                   remote->push_refspec_nr + 1,
 101                   remote->push_refspec_alloc);
 102        remote->push_refspec[remote->push_refspec_nr++] = ref;
 103}
 104
 105static void add_fetch_refspec(struct remote *remote, const char *ref)
 106{
 107        ALLOC_GROW(remote->fetch_refspec,
 108                   remote->fetch_refspec_nr + 1,
 109                   remote->fetch_refspec_alloc);
 110        remote->fetch_refspec[remote->fetch_refspec_nr++] = ref;
 111}
 112
 113static void add_url(struct remote *remote, const char *url)
 114{
 115        ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
 116        remote->url[remote->url_nr++] = url;
 117}
 118
 119static void add_pushurl(struct remote *remote, const char *pushurl)
 120{
 121        ALLOC_GROW(remote->pushurl, remote->pushurl_nr + 1, remote->pushurl_alloc);
 122        remote->pushurl[remote->pushurl_nr++] = pushurl;
 123}
 124
 125static void add_pushurl_alias(struct remote *remote, const char *url)
 126{
 127        const char *pushurl = alias_url(url, &rewrites_push);
 128        if (pushurl != url)
 129                add_pushurl(remote, pushurl);
 130}
 131
 132static void add_url_alias(struct remote *remote, const char *url)
 133{
 134        add_url(remote, alias_url(url, &rewrites));
 135        add_pushurl_alias(remote, url);
 136}
 137
 138static struct remote *make_remote(const char *name, int len)
 139{
 140        struct remote *ret;
 141        int i;
 142
 143        for (i = 0; i < remotes_nr; i++) {
 144                if (len ? (!strncmp(name, remotes[i]->name, len) &&
 145                           !remotes[i]->name[len]) :
 146                    !strcmp(name, remotes[i]->name))
 147                        return remotes[i];
 148        }
 149
 150        ret = xcalloc(1, sizeof(struct remote));
 151        ret->prune = -1;  /* unspecified */
 152        ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
 153        remotes[remotes_nr++] = ret;
 154        if (len)
 155                ret->name = xstrndup(name, len);
 156        else
 157                ret->name = xstrdup(name);
 158        return ret;
 159}
 160
 161static void add_merge(struct branch *branch, const char *name)
 162{
 163        ALLOC_GROW(branch->merge_name, branch->merge_nr + 1,
 164                   branch->merge_alloc);
 165        branch->merge_name[branch->merge_nr++] = name;
 166}
 167
 168static struct branch *make_branch(const char *name, int len)
 169{
 170        struct branch *ret;
 171        int i;
 172        char *refname;
 173
 174        for (i = 0; i < branches_nr; i++) {
 175                if (len ? (!strncmp(name, branches[i]->name, len) &&
 176                           !branches[i]->name[len]) :
 177                    !strcmp(name, branches[i]->name))
 178                        return branches[i];
 179        }
 180
 181        ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
 182        ret = xcalloc(1, sizeof(struct branch));
 183        branches[branches_nr++] = ret;
 184        if (len)
 185                ret->name = xstrndup(name, len);
 186        else
 187                ret->name = xstrdup(name);
 188        refname = xmalloc(strlen(name) + strlen("refs/heads/") + 1);
 189        strcpy(refname, "refs/heads/");
 190        strcpy(refname + strlen("refs/heads/"), ret->name);
 191        ret->refname = refname;
 192
 193        return ret;
 194}
 195
 196static struct rewrite *make_rewrite(struct rewrites *r, const char *base, int len)
 197{
 198        struct rewrite *ret;
 199        int i;
 200
 201        for (i = 0; i < r->rewrite_nr; i++) {
 202                if (len
 203                    ? (len == r->rewrite[i]->baselen &&
 204                       !strncmp(base, r->rewrite[i]->base, len))
 205                    : !strcmp(base, r->rewrite[i]->base))
 206                        return r->rewrite[i];
 207        }
 208
 209        ALLOC_GROW(r->rewrite, r->rewrite_nr + 1, r->rewrite_alloc);
 210        ret = xcalloc(1, sizeof(struct rewrite));
 211        r->rewrite[r->rewrite_nr++] = ret;
 212        if (len) {
 213                ret->base = xstrndup(base, len);
 214                ret->baselen = len;
 215        }
 216        else {
 217                ret->base = xstrdup(base);
 218                ret->baselen = strlen(base);
 219        }
 220        return ret;
 221}
 222
 223static void add_instead_of(struct rewrite *rewrite, const char *instead_of)
 224{
 225        ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
 226        rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
 227        rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
 228        rewrite->instead_of_nr++;
 229}
 230
 231static void read_remotes_file(struct remote *remote)
 232{
 233        FILE *f = fopen(git_path("remotes/%s", remote->name), "r");
 234
 235        if (!f)
 236                return;
 237        remote->origin = REMOTE_REMOTES;
 238        while (fgets(buffer, BUF_SIZE, f)) {
 239                int value_list;
 240                char *s, *p;
 241
 242                if (starts_with(buffer, "URL:")) {
 243                        value_list = 0;
 244                        s = buffer + 4;
 245                } else if (starts_with(buffer, "Push:")) {
 246                        value_list = 1;
 247                        s = buffer + 5;
 248                } else if (starts_with(buffer, "Pull:")) {
 249                        value_list = 2;
 250                        s = buffer + 5;
 251                } else
 252                        continue;
 253
 254                while (isspace(*s))
 255                        s++;
 256                if (!*s)
 257                        continue;
 258
 259                p = s + strlen(s);
 260                while (isspace(p[-1]))
 261                        *--p = 0;
 262
 263                switch (value_list) {
 264                case 0:
 265                        add_url_alias(remote, xstrdup(s));
 266                        break;
 267                case 1:
 268                        add_push_refspec(remote, xstrdup(s));
 269                        break;
 270                case 2:
 271                        add_fetch_refspec(remote, xstrdup(s));
 272                        break;
 273                }
 274        }
 275        fclose(f);
 276}
 277
 278static void read_branches_file(struct remote *remote)
 279{
 280        char *frag;
 281        struct strbuf branch = STRBUF_INIT;
 282        int n = 1000;
 283        FILE *f = fopen(git_path("branches/%.*s", n, remote->name), "r");
 284        char *s, *p;
 285        int len;
 286
 287        if (!f)
 288                return;
 289        s = fgets(buffer, BUF_SIZE, f);
 290        fclose(f);
 291        if (!s)
 292                return;
 293        while (isspace(*s))
 294                s++;
 295        if (!*s)
 296                return;
 297        remote->origin = REMOTE_BRANCHES;
 298        p = s + strlen(s);
 299        while (isspace(p[-1]))
 300                *--p = 0;
 301        len = p - s;
 302        p = xmalloc(len + 1);
 303        strcpy(p, s);
 304
 305        /*
 306         * The branches file would have URL and optionally
 307         * #branch specified.  The "master" (or specified) branch is
 308         * fetched and stored in the local branch of the same name.
 309         */
 310        frag = strchr(p, '#');
 311        if (frag) {
 312                *(frag++) = '\0';
 313                strbuf_addf(&branch, "refs/heads/%s", frag);
 314        } else
 315                strbuf_addstr(&branch, "refs/heads/master");
 316
 317        strbuf_addf(&branch, ":refs/heads/%s", remote->name);
 318        add_url_alias(remote, p);
 319        add_fetch_refspec(remote, strbuf_detach(&branch, NULL));
 320        /*
 321         * Cogito compatible push: push current HEAD to remote #branch
 322         * (master if missing)
 323         */
 324        strbuf_init(&branch, 0);
 325        strbuf_addstr(&branch, "HEAD");
 326        if (frag)
 327                strbuf_addf(&branch, ":refs/heads/%s", frag);
 328        else
 329                strbuf_addstr(&branch, ":refs/heads/master");
 330        add_push_refspec(remote, strbuf_detach(&branch, NULL));
 331        remote->fetch_tags = 1; /* always auto-follow */
 332}
 333
 334static int handle_config(const char *key, const char *value, void *cb)
 335{
 336        const char *name;
 337        const char *subkey;
 338        struct remote *remote;
 339        struct branch *branch;
 340        if (starts_with(key, "branch.")) {
 341                name = key + 7;
 342                subkey = strrchr(name, '.');
 343                if (!subkey)
 344                        return 0;
 345                branch = make_branch(name, subkey - name);
 346                if (!strcmp(subkey, ".remote")) {
 347                        if (git_config_string(&branch->remote_name, key, value))
 348                                return -1;
 349                        if (branch == current_branch) {
 350                                default_remote_name = branch->remote_name;
 351                                explicit_default_remote_name = 1;
 352                        }
 353                } else if (!strcmp(subkey, ".pushremote")) {
 354                        if (branch == current_branch)
 355                                if (git_config_string(&pushremote_name, key, value))
 356                                        return -1;
 357                } else if (!strcmp(subkey, ".merge")) {
 358                        if (!value)
 359                                return config_error_nonbool(key);
 360                        add_merge(branch, xstrdup(value));
 361                }
 362                return 0;
 363        }
 364        if (starts_with(key, "url.")) {
 365                struct rewrite *rewrite;
 366                name = key + 4;
 367                subkey = strrchr(name, '.');
 368                if (!subkey)
 369                        return 0;
 370                if (!strcmp(subkey, ".insteadof")) {
 371                        rewrite = make_rewrite(&rewrites, name, subkey - name);
 372                        if (!value)
 373                                return config_error_nonbool(key);
 374                        add_instead_of(rewrite, xstrdup(value));
 375                } else if (!strcmp(subkey, ".pushinsteadof")) {
 376                        rewrite = make_rewrite(&rewrites_push, name, subkey - name);
 377                        if (!value)
 378                                return config_error_nonbool(key);
 379                        add_instead_of(rewrite, xstrdup(value));
 380                }
 381        }
 382
 383        if (!starts_with(key,  "remote."))
 384                return 0;
 385        name = key + 7;
 386
 387        /* Handle remote.* variables */
 388        if (!strcmp(name, "pushdefault"))
 389                return git_config_string(&pushremote_name, key, value);
 390
 391        /* Handle remote.<name>.* variables */
 392        if (*name == '/') {
 393                warning("Config remote shorthand cannot begin with '/': %s",
 394                        name);
 395                return 0;
 396        }
 397        subkey = strrchr(name, '.');
 398        if (!subkey)
 399                return 0;
 400        remote = make_remote(name, subkey - name);
 401        remote->origin = REMOTE_CONFIG;
 402        if (!strcmp(subkey, ".mirror"))
 403                remote->mirror = git_config_bool(key, value);
 404        else if (!strcmp(subkey, ".skipdefaultupdate"))
 405                remote->skip_default_update = git_config_bool(key, value);
 406        else if (!strcmp(subkey, ".skipfetchall"))
 407                remote->skip_default_update = git_config_bool(key, value);
 408        else if (!strcmp(subkey, ".prune"))
 409                remote->prune = git_config_bool(key, value);
 410        else if (!strcmp(subkey, ".url")) {
 411                const char *v;
 412                if (git_config_string(&v, key, value))
 413                        return -1;
 414                add_url(remote, v);
 415        } else if (!strcmp(subkey, ".pushurl")) {
 416                const char *v;
 417                if (git_config_string(&v, key, value))
 418                        return -1;
 419                add_pushurl(remote, v);
 420        } else if (!strcmp(subkey, ".push")) {
 421                const char *v;
 422                if (git_config_string(&v, key, value))
 423                        return -1;
 424                add_push_refspec(remote, v);
 425        } else if (!strcmp(subkey, ".fetch")) {
 426                const char *v;
 427                if (git_config_string(&v, key, value))
 428                        return -1;
 429                add_fetch_refspec(remote, v);
 430        } else if (!strcmp(subkey, ".receivepack")) {
 431                const char *v;
 432                if (git_config_string(&v, key, value))
 433                        return -1;
 434                if (!remote->receivepack)
 435                        remote->receivepack = v;
 436                else
 437                        error("more than one receivepack given, using the first");
 438        } else if (!strcmp(subkey, ".uploadpack")) {
 439                const char *v;
 440                if (git_config_string(&v, key, value))
 441                        return -1;
 442                if (!remote->uploadpack)
 443                        remote->uploadpack = v;
 444                else
 445                        error("more than one uploadpack given, using the first");
 446        } else if (!strcmp(subkey, ".tagopt")) {
 447                if (!strcmp(value, "--no-tags"))
 448                        remote->fetch_tags = -1;
 449                else if (!strcmp(value, "--tags"))
 450                        remote->fetch_tags = 2;
 451        } else if (!strcmp(subkey, ".proxy")) {
 452                return git_config_string((const char **)&remote->http_proxy,
 453                                         key, value);
 454        } else if (!strcmp(subkey, ".vcs")) {
 455                return git_config_string(&remote->foreign_vcs, key, value);
 456        }
 457        return 0;
 458}
 459
 460static void alias_all_urls(void)
 461{
 462        int i, j;
 463        for (i = 0; i < remotes_nr; i++) {
 464                int add_pushurl_aliases;
 465                if (!remotes[i])
 466                        continue;
 467                for (j = 0; j < remotes[i]->pushurl_nr; j++) {
 468                        remotes[i]->pushurl[j] = alias_url(remotes[i]->pushurl[j], &rewrites);
 469                }
 470                add_pushurl_aliases = remotes[i]->pushurl_nr == 0;
 471                for (j = 0; j < remotes[i]->url_nr; j++) {
 472                        if (add_pushurl_aliases)
 473                                add_pushurl_alias(remotes[i], remotes[i]->url[j]);
 474                        remotes[i]->url[j] = alias_url(remotes[i]->url[j], &rewrites);
 475                }
 476        }
 477}
 478
 479static void read_config(void)
 480{
 481        unsigned char sha1[20];
 482        const char *head_ref;
 483        int flag;
 484        if (default_remote_name) /* did this already */
 485                return;
 486        default_remote_name = "origin";
 487        current_branch = NULL;
 488        head_ref = resolve_ref_unsafe("HEAD", sha1, 0, &flag);
 489        if (head_ref && (flag & REF_ISSYMREF) &&
 490            starts_with(head_ref, "refs/heads/")) {
 491                current_branch =
 492                        make_branch(head_ref + strlen("refs/heads/"), 0);
 493        }
 494        git_config(handle_config, NULL);
 495        alias_all_urls();
 496}
 497
 498/*
 499 * This function frees a refspec array.
 500 * Warning: code paths should be checked to ensure that the src
 501 *          and dst pointers are always freeable pointers as well
 502 *          as the refspec pointer itself.
 503 */
 504static void free_refspecs(struct refspec *refspec, int nr_refspec)
 505{
 506        int i;
 507
 508        if (!refspec)
 509                return;
 510
 511        for (i = 0; i < nr_refspec; i++) {
 512                free(refspec[i].src);
 513                free(refspec[i].dst);
 514        }
 515        free(refspec);
 516}
 517
 518static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
 519{
 520        int i;
 521        struct refspec *rs = xcalloc(sizeof(*rs), nr_refspec);
 522
 523        for (i = 0; i < nr_refspec; i++) {
 524                size_t llen;
 525                int is_glob;
 526                const char *lhs, *rhs;
 527                int flags;
 528
 529                is_glob = 0;
 530
 531                lhs = refspec[i];
 532                if (*lhs == '+') {
 533                        rs[i].force = 1;
 534                        lhs++;
 535                }
 536
 537                rhs = strrchr(lhs, ':');
 538
 539                /*
 540                 * Before going on, special case ":" (or "+:") as a refspec
 541                 * for pushing matching refs.
 542                 */
 543                if (!fetch && rhs == lhs && rhs[1] == '\0') {
 544                        rs[i].matching = 1;
 545                        continue;
 546                }
 547
 548                if (rhs) {
 549                        size_t rlen = strlen(++rhs);
 550                        is_glob = (1 <= rlen && strchr(rhs, '*'));
 551                        rs[i].dst = xstrndup(rhs, rlen);
 552                }
 553
 554                llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
 555                if (1 <= llen && memchr(lhs, '*', llen)) {
 556                        if ((rhs && !is_glob) || (!rhs && fetch))
 557                                goto invalid;
 558                        is_glob = 1;
 559                } else if (rhs && is_glob) {
 560                        goto invalid;
 561                }
 562
 563                rs[i].pattern = is_glob;
 564                rs[i].src = xstrndup(lhs, llen);
 565                flags = REFNAME_ALLOW_ONELEVEL | (is_glob ? REFNAME_REFSPEC_PATTERN : 0);
 566
 567                if (fetch) {
 568                        unsigned char unused[40];
 569
 570                        /* LHS */
 571                        if (!*rs[i].src)
 572                                ; /* empty is ok; it means "HEAD" */
 573                        else if (llen == 40 && !get_sha1_hex(rs[i].src, unused))
 574                                rs[i].exact_sha1 = 1; /* ok */
 575                        else if (!check_refname_format(rs[i].src, flags))
 576                                ; /* valid looking ref is ok */
 577                        else
 578                                goto invalid;
 579                        /* RHS */
 580                        if (!rs[i].dst)
 581                                ; /* missing is ok; it is the same as empty */
 582                        else if (!*rs[i].dst)
 583                                ; /* empty is ok; it means "do not store" */
 584                        else if (!check_refname_format(rs[i].dst, flags))
 585                                ; /* valid looking ref is ok */
 586                        else
 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
 673static struct remote *remote_get_1(const char *name, const char *pushremote_name)
 674{
 675        struct remote *ret;
 676        int name_given = 0;
 677
 678        if (name)
 679                name_given = 1;
 680        else {
 681                if (pushremote_name) {
 682                        name = pushremote_name;
 683                        name_given = 1;
 684                } else {
 685                        name = default_remote_name;
 686                        name_given = explicit_default_remote_name;
 687                }
 688        }
 689
 690        ret = make_remote(name, 0);
 691        if (valid_remote_nick(name)) {
 692                if (!valid_remote(ret))
 693                        read_remotes_file(ret);
 694                if (!valid_remote(ret))
 695                        read_branches_file(ret);
 696        }
 697        if (name_given && !valid_remote(ret))
 698                add_url_alias(ret, name);
 699        if (!valid_remote(ret))
 700                return NULL;
 701        ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
 702        ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
 703        return ret;
 704}
 705
 706struct remote *remote_get(const char *name)
 707{
 708        read_config();
 709        return remote_get_1(name, NULL);
 710}
 711
 712struct remote *pushremote_get(const char *name)
 713{
 714        read_config();
 715        return remote_get_1(name, pushremote_name);
 716}
 717
 718int remote_is_configured(const char *name)
 719{
 720        int i;
 721        read_config();
 722
 723        for (i = 0; i < remotes_nr; i++)
 724                if (!strcmp(name, remotes[i]->name))
 725                        return 1;
 726        return 0;
 727}
 728
 729int for_each_remote(each_remote_fn fn, void *priv)
 730{
 731        int i, result = 0;
 732        read_config();
 733        for (i = 0; i < remotes_nr && !result; i++) {
 734                struct remote *r = remotes[i];
 735                if (!r)
 736                        continue;
 737                if (!r->fetch)
 738                        r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
 739                                                       r->fetch_refspec);
 740                if (!r->push)
 741                        r->push = parse_push_refspec(r->push_refspec_nr,
 742                                                     r->push_refspec);
 743                result = fn(r, priv);
 744        }
 745        return result;
 746}
 747
 748static void handle_duplicate(struct ref *ref1, struct ref *ref2)
 749{
 750        if (strcmp(ref1->name, ref2->name)) {
 751                if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
 752                    ref2->fetch_head_status != FETCH_HEAD_IGNORE) {
 753                        die(_("Cannot fetch both %s and %s to %s"),
 754                            ref1->name, ref2->name, ref2->peer_ref->name);
 755                } else if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
 756                           ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
 757                        warning(_("%s usually tracks %s, not %s"),
 758                                ref2->peer_ref->name, ref2->name, ref1->name);
 759                } else if (ref1->fetch_head_status == FETCH_HEAD_IGNORE &&
 760                           ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
 761                        die(_("%s tracks both %s and %s"),
 762                            ref2->peer_ref->name, ref1->name, ref2->name);
 763                } else {
 764                        /*
 765                         * This last possibility doesn't occur because
 766                         * FETCH_HEAD_IGNORE entries always appear at
 767                         * the end of the list.
 768                         */
 769                        die(_("Internal error"));
 770                }
 771        }
 772        free(ref2->peer_ref);
 773        free(ref2);
 774}
 775
 776struct ref *ref_remove_duplicates(struct ref *ref_map)
 777{
 778        struct string_list refs = STRING_LIST_INIT_NODUP;
 779        struct ref *retval = NULL;
 780        struct ref **p = &retval;
 781
 782        while (ref_map) {
 783                struct ref *ref = ref_map;
 784
 785                ref_map = ref_map->next;
 786                ref->next = NULL;
 787
 788                if (!ref->peer_ref) {
 789                        *p = ref;
 790                        p = &ref->next;
 791                } else {
 792                        struct string_list_item *item =
 793                                string_list_insert(&refs, ref->peer_ref->name);
 794
 795                        if (item->util) {
 796                                /* Entry already existed */
 797                                handle_duplicate((struct ref *)item->util, ref);
 798                        } else {
 799                                *p = ref;
 800                                p = &ref->next;
 801                                item->util = ref;
 802                        }
 803                }
 804        }
 805
 806        string_list_clear(&refs, 0);
 807        return retval;
 808}
 809
 810int remote_has_url(struct remote *remote, const char *url)
 811{
 812        int i;
 813        for (i = 0; i < remote->url_nr; i++) {
 814                if (!strcmp(remote->url[i], url))
 815                        return 1;
 816        }
 817        return 0;
 818}
 819
 820static int match_name_with_pattern(const char *key, const char *name,
 821                                   const char *value, char **result)
 822{
 823        const char *kstar = strchr(key, '*');
 824        size_t klen;
 825        size_t ksuffixlen;
 826        size_t namelen;
 827        int ret;
 828        if (!kstar)
 829                die("Key '%s' of pattern had no '*'", key);
 830        klen = kstar - key;
 831        ksuffixlen = strlen(kstar + 1);
 832        namelen = strlen(name);
 833        ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
 834                !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
 835        if (ret && value) {
 836                const char *vstar = strchr(value, '*');
 837                size_t vlen;
 838                size_t vsuffixlen;
 839                if (!vstar)
 840                        die("Value '%s' of pattern has no '*'", value);
 841                vlen = vstar - value;
 842                vsuffixlen = strlen(vstar + 1);
 843                *result = xmalloc(vlen + vsuffixlen +
 844                                  strlen(name) -
 845                                  klen - ksuffixlen + 1);
 846                strncpy(*result, value, vlen);
 847                strncpy(*result + vlen,
 848                        name + klen, namelen - klen - ksuffixlen);
 849                strcpy(*result + vlen + namelen - klen - ksuffixlen,
 850                       vstar + 1);
 851        }
 852        return ret;
 853}
 854
 855int query_refspecs(struct refspec *refs, int ref_count, struct refspec *query)
 856{
 857        int i;
 858        int find_src = !query->src;
 859        const char *needle = find_src ? query->dst : query->src;
 860        char **result = find_src ? &query->src : &query->dst;
 861
 862        if (find_src && !query->dst)
 863                return error("query_refspecs: need either src or dst");
 864
 865        for (i = 0; i < ref_count; i++) {
 866                struct refspec *refspec = &refs[i];
 867                const char *key = find_src ? refspec->dst : refspec->src;
 868                const char *value = find_src ? refspec->src : refspec->dst;
 869
 870                if (!refspec->dst)
 871                        continue;
 872                if (refspec->pattern) {
 873                        if (match_name_with_pattern(key, needle, value, result)) {
 874                                query->force = refspec->force;
 875                                return 0;
 876                        }
 877                } else if (!strcmp(needle, key)) {
 878                        *result = xstrdup(value);
 879                        query->force = refspec->force;
 880                        return 0;
 881                }
 882        }
 883        return -1;
 884}
 885
 886char *apply_refspecs(struct refspec *refspecs, int nr_refspec,
 887                     const char *name)
 888{
 889        struct refspec query;
 890
 891        memset(&query, 0, sizeof(struct refspec));
 892        query.src = (char *)name;
 893
 894        if (query_refspecs(refspecs, nr_refspec, &query))
 895                return NULL;
 896
 897        return query.dst;
 898}
 899
 900int remote_find_tracking(struct remote *remote, struct refspec *refspec)
 901{
 902        return query_refspecs(remote->fetch, remote->fetch_refspec_nr, refspec);
 903}
 904
 905static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
 906                const char *name)
 907{
 908        size_t len = strlen(name);
 909        struct ref *ref = xcalloc(1, sizeof(struct ref) + prefixlen + len + 1);
 910        memcpy(ref->name, prefix, prefixlen);
 911        memcpy(ref->name + prefixlen, name, len);
 912        return ref;
 913}
 914
 915struct ref *alloc_ref(const char *name)
 916{
 917        return alloc_ref_with_prefix("", 0, name);
 918}
 919
 920struct ref *copy_ref(const struct ref *ref)
 921{
 922        struct ref *cpy;
 923        size_t len;
 924        if (!ref)
 925                return NULL;
 926        len = strlen(ref->name);
 927        cpy = xmalloc(sizeof(struct ref) + len + 1);
 928        memcpy(cpy, ref, sizeof(struct ref) + len + 1);
 929        cpy->next = NULL;
 930        cpy->symref = ref->symref ? xstrdup(ref->symref) : NULL;
 931        cpy->remote_status = ref->remote_status ? xstrdup(ref->remote_status) : NULL;
 932        cpy->peer_ref = copy_ref(ref->peer_ref);
 933        return cpy;
 934}
 935
 936struct ref *copy_ref_list(const struct ref *ref)
 937{
 938        struct ref *ret = NULL;
 939        struct ref **tail = &ret;
 940        while (ref) {
 941                *tail = copy_ref(ref);
 942                ref = ref->next;
 943                tail = &((*tail)->next);
 944        }
 945        return ret;
 946}
 947
 948static void free_ref(struct ref *ref)
 949{
 950        if (!ref)
 951                return;
 952        free_ref(ref->peer_ref);
 953        free(ref->remote_status);
 954        free(ref->symref);
 955        free(ref);
 956}
 957
 958void free_refs(struct ref *ref)
 959{
 960        struct ref *next;
 961        while (ref) {
 962                next = ref->next;
 963                free_ref(ref);
 964                ref = next;
 965        }
 966}
 967
 968int ref_compare_name(const void *va, const void *vb)
 969{
 970        const struct ref *a = va, *b = vb;
 971        return strcmp(a->name, b->name);
 972}
 973
 974static void *ref_list_get_next(const void *a)
 975{
 976        return ((const struct ref *)a)->next;
 977}
 978
 979static void ref_list_set_next(void *a, void *next)
 980{
 981        ((struct ref *)a)->next = next;
 982}
 983
 984void sort_ref_list(struct ref **l, int (*cmp)(const void *, const void *))
 985{
 986        *l = llist_mergesort(*l, ref_list_get_next, ref_list_set_next, cmp);
 987}
 988
 989int count_refspec_match(const char *pattern,
 990                        struct ref *refs,
 991                        struct ref **matched_ref)
 992{
 993        int patlen = strlen(pattern);
 994        struct ref *matched_weak = NULL;
 995        struct ref *matched = NULL;
 996        int weak_match = 0;
 997        int match = 0;
 998
 999        for (weak_match = match = 0; refs; refs = refs->next) {
1000                char *name = refs->name;
1001                int namelen = strlen(name);
1002
1003                if (!refname_match(pattern, name))
1004                        continue;
1005
1006                /* A match is "weak" if it is with refs outside
1007                 * heads or tags, and did not specify the pattern
1008                 * in full (e.g. "refs/remotes/origin/master") or at
1009                 * least from the toplevel (e.g. "remotes/origin/master");
1010                 * otherwise "git push $URL master" would result in
1011                 * ambiguity between remotes/origin/master and heads/master
1012                 * at the remote site.
1013                 */
1014                if (namelen != patlen &&
1015                    patlen != namelen - 5 &&
1016                    !starts_with(name, "refs/heads/") &&
1017                    !starts_with(name, "refs/tags/")) {
1018                        /* We want to catch the case where only weak
1019                         * matches are found and there are multiple
1020                         * matches, and where more than one strong
1021                         * matches are found, as ambiguous.  One
1022                         * strong match with zero or more weak matches
1023                         * are acceptable as a unique match.
1024                         */
1025                        matched_weak = refs;
1026                        weak_match++;
1027                }
1028                else {
1029                        matched = refs;
1030                        match++;
1031                }
1032        }
1033        if (!matched) {
1034                *matched_ref = matched_weak;
1035                return weak_match;
1036        }
1037        else {
1038                *matched_ref = matched;
1039                return match;
1040        }
1041}
1042
1043static void tail_link_ref(struct ref *ref, struct ref ***tail)
1044{
1045        **tail = ref;
1046        while (ref->next)
1047                ref = ref->next;
1048        *tail = &ref->next;
1049}
1050
1051static struct ref *alloc_delete_ref(void)
1052{
1053        struct ref *ref = alloc_ref("(delete)");
1054        hashclr(ref->new_sha1);
1055        return ref;
1056}
1057
1058static struct ref *try_explicit_object_name(const char *name)
1059{
1060        unsigned char sha1[20];
1061        struct ref *ref;
1062
1063        if (!*name)
1064                return alloc_delete_ref();
1065        if (get_sha1(name, sha1))
1066                return NULL;
1067        ref = alloc_ref(name);
1068        hashcpy(ref->new_sha1, sha1);
1069        return ref;
1070}
1071
1072static struct ref *make_linked_ref(const char *name, struct ref ***tail)
1073{
1074        struct ref *ret = alloc_ref(name);
1075        tail_link_ref(ret, tail);
1076        return ret;
1077}
1078
1079static char *guess_ref(const char *name, struct ref *peer)
1080{
1081        struct strbuf buf = STRBUF_INIT;
1082        unsigned char sha1[20];
1083
1084        const char *r = resolve_ref_unsafe(peer->name, sha1, 1, NULL);
1085        if (!r)
1086                return NULL;
1087
1088        if (starts_with(r, "refs/heads/"))
1089                strbuf_addstr(&buf, "refs/heads/");
1090        else if (starts_with(r, "refs/tags/"))
1091                strbuf_addstr(&buf, "refs/tags/");
1092        else
1093                return NULL;
1094
1095        strbuf_addstr(&buf, name);
1096        return strbuf_detach(&buf, NULL);
1097}
1098
1099static int match_explicit(struct ref *src, struct ref *dst,
1100                          struct ref ***dst_tail,
1101                          struct refspec *rs)
1102{
1103        struct ref *matched_src, *matched_dst;
1104        int copy_src;
1105
1106        const char *dst_value = rs->dst;
1107        char *dst_guess;
1108
1109        if (rs->pattern || rs->matching)
1110                return 0;
1111
1112        matched_src = matched_dst = NULL;
1113        switch (count_refspec_match(rs->src, src, &matched_src)) {
1114        case 1:
1115                copy_src = 1;
1116                break;
1117        case 0:
1118                /* The source could be in the get_sha1() format
1119                 * not a reference name.  :refs/other is a
1120                 * way to delete 'other' ref at the remote end.
1121                 */
1122                matched_src = try_explicit_object_name(rs->src);
1123                if (!matched_src)
1124                        return error("src refspec %s does not match any.", rs->src);
1125                copy_src = 0;
1126                break;
1127        default:
1128                return error("src refspec %s matches more than one.", rs->src);
1129        }
1130
1131        if (!dst_value) {
1132                unsigned char sha1[20];
1133                int flag;
1134
1135                dst_value = resolve_ref_unsafe(matched_src->name, sha1, 1, &flag);
1136                if (!dst_value ||
1137                    ((flag & REF_ISSYMREF) &&
1138                     !starts_with(dst_value, "refs/heads/")))
1139                        die("%s cannot be resolved to branch.",
1140                            matched_src->name);
1141        }
1142
1143        switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1144        case 1:
1145                break;
1146        case 0:
1147                if (!memcmp(dst_value, "refs/", 5))
1148                        matched_dst = make_linked_ref(dst_value, dst_tail);
1149                else if (is_null_sha1(matched_src->new_sha1))
1150                        error("unable to delete '%s': remote ref does not exist",
1151                              dst_value);
1152                else if ((dst_guess = guess_ref(dst_value, matched_src)))
1153                        matched_dst = make_linked_ref(dst_guess, dst_tail);
1154                else
1155                        error("unable to push to unqualified destination: %s\n"
1156                              "The destination refspec neither matches an "
1157                              "existing ref on the remote nor\n"
1158                              "begins with refs/, and we are unable to "
1159                              "guess a prefix based on the source ref.",
1160                              dst_value);
1161                break;
1162        default:
1163                matched_dst = NULL;
1164                error("dst refspec %s matches more than one.",
1165                      dst_value);
1166                break;
1167        }
1168        if (!matched_dst)
1169                return -1;
1170        if (matched_dst->peer_ref)
1171                return error("dst ref %s receives from more than one src.",
1172                      matched_dst->name);
1173        else {
1174                matched_dst->peer_ref = copy_src ? copy_ref(matched_src) : matched_src;
1175                matched_dst->force = rs->force;
1176        }
1177        return 0;
1178}
1179
1180static int match_explicit_refs(struct ref *src, struct ref *dst,
1181                               struct ref ***dst_tail, struct refspec *rs,
1182                               int rs_nr)
1183{
1184        int i, errs;
1185        for (i = errs = 0; i < rs_nr; i++)
1186                errs += match_explicit(src, dst, dst_tail, &rs[i]);
1187        return errs;
1188}
1189
1190static char *get_ref_match(const struct refspec *rs, int rs_nr, const struct ref *ref,
1191                int send_mirror, int direction, const struct refspec **ret_pat)
1192{
1193        const struct refspec *pat;
1194        char *name;
1195        int i;
1196        int matching_refs = -1;
1197        for (i = 0; i < rs_nr; i++) {
1198                if (rs[i].matching &&
1199                    (matching_refs == -1 || rs[i].force)) {
1200                        matching_refs = i;
1201                        continue;
1202                }
1203
1204                if (rs[i].pattern) {
1205                        const char *dst_side = rs[i].dst ? rs[i].dst : rs[i].src;
1206                        int match;
1207                        if (direction == FROM_SRC)
1208                                match = match_name_with_pattern(rs[i].src, ref->name, dst_side, &name);
1209                        else
1210                                match = match_name_with_pattern(dst_side, ref->name, rs[i].src, &name);
1211                        if (match) {
1212                                matching_refs = i;
1213                                break;
1214                        }
1215                }
1216        }
1217        if (matching_refs == -1)
1218                return NULL;
1219
1220        pat = rs + matching_refs;
1221        if (pat->matching) {
1222                /*
1223                 * "matching refs"; traditionally we pushed everything
1224                 * including refs outside refs/heads/ hierarchy, but
1225                 * that does not make much sense these days.
1226                 */
1227                if (!send_mirror && !starts_with(ref->name, "refs/heads/"))
1228                        return NULL;
1229                name = xstrdup(ref->name);
1230        }
1231        if (ret_pat)
1232                *ret_pat = pat;
1233        return name;
1234}
1235
1236static struct ref **tail_ref(struct ref **head)
1237{
1238        struct ref **tail = head;
1239        while (*tail)
1240                tail = &((*tail)->next);
1241        return tail;
1242}
1243
1244struct tips {
1245        struct commit **tip;
1246        int nr, alloc;
1247};
1248
1249static void add_to_tips(struct tips *tips, const unsigned char *sha1)
1250{
1251        struct commit *commit;
1252
1253        if (is_null_sha1(sha1))
1254                return;
1255        commit = lookup_commit_reference_gently(sha1, 1);
1256        if (!commit || (commit->object.flags & TMP_MARK))
1257                return;
1258        commit->object.flags |= TMP_MARK;
1259        ALLOC_GROW(tips->tip, tips->nr + 1, tips->alloc);
1260        tips->tip[tips->nr++] = commit;
1261}
1262
1263static void add_missing_tags(struct ref *src, struct ref **dst, struct ref ***dst_tail)
1264{
1265        struct string_list dst_tag = STRING_LIST_INIT_NODUP;
1266        struct string_list src_tag = STRING_LIST_INIT_NODUP;
1267        struct string_list_item *item;
1268        struct ref *ref;
1269        struct tips sent_tips;
1270
1271        /*
1272         * Collect everything we know they would have at the end of
1273         * this push, and collect all tags they have.
1274         */
1275        memset(&sent_tips, 0, sizeof(sent_tips));
1276        for (ref = *dst; ref; ref = ref->next) {
1277                if (ref->peer_ref &&
1278                    !is_null_sha1(ref->peer_ref->new_sha1))
1279                        add_to_tips(&sent_tips, ref->peer_ref->new_sha1);
1280                else
1281                        add_to_tips(&sent_tips, ref->old_sha1);
1282                if (starts_with(ref->name, "refs/tags/"))
1283                        string_list_append(&dst_tag, ref->name);
1284        }
1285        clear_commit_marks_many(sent_tips.nr, sent_tips.tip, TMP_MARK);
1286
1287        sort_string_list(&dst_tag);
1288
1289        /* Collect tags they do not have. */
1290        for (ref = src; ref; ref = ref->next) {
1291                if (!starts_with(ref->name, "refs/tags/"))
1292                        continue; /* not a tag */
1293                if (string_list_has_string(&dst_tag, ref->name))
1294                        continue; /* they already have it */
1295                if (sha1_object_info(ref->new_sha1, NULL) != OBJ_TAG)
1296                        continue; /* be conservative */
1297                item = string_list_append(&src_tag, ref->name);
1298                item->util = ref;
1299        }
1300        string_list_clear(&dst_tag, 0);
1301
1302        /*
1303         * At this point, src_tag lists tags that are missing from
1304         * dst, and sent_tips lists the tips we are pushing or those
1305         * that we know they already have. An element in the src_tag
1306         * that is an ancestor of any of the sent_tips needs to be
1307         * sent to the other side.
1308         */
1309        if (sent_tips.nr) {
1310                for_each_string_list_item(item, &src_tag) {
1311                        struct ref *ref = item->util;
1312                        struct ref *dst_ref;
1313                        struct commit *commit;
1314
1315                        if (is_null_sha1(ref->new_sha1))
1316                                continue;
1317                        commit = lookup_commit_reference_gently(ref->new_sha1, 1);
1318                        if (!commit)
1319                                /* not pushing a commit, which is not an error */
1320                                continue;
1321
1322                        /*
1323                         * Is this tag, which they do not have, reachable from
1324                         * any of the commits we are sending?
1325                         */
1326                        if (!in_merge_bases_many(commit, sent_tips.nr, sent_tips.tip))
1327                                continue;
1328
1329                        /* Add it in */
1330                        dst_ref = make_linked_ref(ref->name, dst_tail);
1331                        hashcpy(dst_ref->new_sha1, ref->new_sha1);
1332                        dst_ref->peer_ref = copy_ref(ref);
1333                }
1334        }
1335        string_list_clear(&src_tag, 0);
1336        free(sent_tips.tip);
1337}
1338
1339struct ref *find_ref_by_name(const struct ref *list, const char *name)
1340{
1341        for ( ; list; list = list->next)
1342                if (!strcmp(list->name, name))
1343                        return (struct ref *)list;
1344        return NULL;
1345}
1346
1347static void prepare_ref_index(struct string_list *ref_index, struct ref *ref)
1348{
1349        for ( ; ref; ref = ref->next)
1350                string_list_append_nodup(ref_index, ref->name)->util = ref;
1351
1352        sort_string_list(ref_index);
1353}
1354
1355/*
1356 * Given the set of refs the local repository has, the set of refs the
1357 * remote repository has, and the refspec used for push, determine
1358 * what remote refs we will update and with what value by setting
1359 * peer_ref (which object is being pushed) and force (if the push is
1360 * forced) in elements of "dst". The function may add new elements to
1361 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
1362 */
1363int match_push_refs(struct ref *src, struct ref **dst,
1364                    int nr_refspec, const char **refspec, int flags)
1365{
1366        struct refspec *rs;
1367        int send_all = flags & MATCH_REFS_ALL;
1368        int send_mirror = flags & MATCH_REFS_MIRROR;
1369        int send_prune = flags & MATCH_REFS_PRUNE;
1370        int errs;
1371        static const char *default_refspec[] = { ":", NULL };
1372        struct ref *ref, **dst_tail = tail_ref(dst);
1373        struct string_list dst_ref_index = STRING_LIST_INIT_NODUP;
1374
1375        if (!nr_refspec) {
1376                nr_refspec = 1;
1377                refspec = default_refspec;
1378        }
1379        rs = parse_push_refspec(nr_refspec, (const char **) refspec);
1380        errs = match_explicit_refs(src, *dst, &dst_tail, rs, nr_refspec);
1381
1382        /* pick the remainder */
1383        for (ref = src; ref; ref = ref->next) {
1384                struct string_list_item *dst_item;
1385                struct ref *dst_peer;
1386                const struct refspec *pat = NULL;
1387                char *dst_name;
1388
1389                dst_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_SRC, &pat);
1390                if (!dst_name)
1391                        continue;
1392
1393                if (!dst_ref_index.nr)
1394                        prepare_ref_index(&dst_ref_index, *dst);
1395
1396                dst_item = string_list_lookup(&dst_ref_index, dst_name);
1397                dst_peer = dst_item ? dst_item->util : NULL;
1398                if (dst_peer) {
1399                        if (dst_peer->peer_ref)
1400                                /* We're already sending something to this ref. */
1401                                goto free_name;
1402                } else {
1403                        if (pat->matching && !(send_all || send_mirror))
1404                                /*
1405                                 * Remote doesn't have it, and we have no
1406                                 * explicit pattern, and we don't have
1407                                 * --all nor --mirror.
1408                                 */
1409                                goto free_name;
1410
1411                        /* Create a new one and link it */
1412                        dst_peer = make_linked_ref(dst_name, &dst_tail);
1413                        hashcpy(dst_peer->new_sha1, ref->new_sha1);
1414                        string_list_insert(&dst_ref_index,
1415                                dst_peer->name)->util = dst_peer;
1416                }
1417                dst_peer->peer_ref = copy_ref(ref);
1418                dst_peer->force = pat->force;
1419        free_name:
1420                free(dst_name);
1421        }
1422
1423        string_list_clear(&dst_ref_index, 0);
1424
1425        if (flags & MATCH_REFS_FOLLOW_TAGS)
1426                add_missing_tags(src, dst, &dst_tail);
1427
1428        if (send_prune) {
1429                struct string_list src_ref_index = STRING_LIST_INIT_NODUP;
1430                /* check for missing refs on the remote */
1431                for (ref = *dst; ref; ref = ref->next) {
1432                        char *src_name;
1433
1434                        if (ref->peer_ref)
1435                                /* We're already sending something to this ref. */
1436                                continue;
1437
1438                        src_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_DST, NULL);
1439                        if (src_name) {
1440                                if (!src_ref_index.nr)
1441                                        prepare_ref_index(&src_ref_index, src);
1442                                if (!string_list_has_string(&src_ref_index,
1443                                            src_name))
1444                                        ref->peer_ref = alloc_delete_ref();
1445                                free(src_name);
1446                        }
1447                }
1448                string_list_clear(&src_ref_index, 0);
1449        }
1450        if (errs)
1451                return -1;
1452        return 0;
1453}
1454
1455void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1456                             int force_update)
1457{
1458        struct ref *ref;
1459
1460        for (ref = remote_refs; ref; ref = ref->next) {
1461                int force_ref_update = ref->force || force_update;
1462                int reject_reason = 0;
1463
1464                if (ref->peer_ref)
1465                        hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
1466                else if (!send_mirror)
1467                        continue;
1468
1469                ref->deletion = is_null_sha1(ref->new_sha1);
1470                if (!ref->deletion &&
1471                        !hashcmp(ref->old_sha1, ref->new_sha1)) {
1472                        ref->status = REF_STATUS_UPTODATE;
1473                        continue;
1474                }
1475
1476                /*
1477                 * Bypass the usual "must fast-forward" check but
1478                 * replace it with a weaker "the old value must be
1479                 * this value we observed".  If the remote ref has
1480                 * moved and is now different from what we expect,
1481                 * reject any push.
1482                 *
1483                 * It also is an error if the user told us to check
1484                 * with the remote-tracking branch to find the value
1485                 * to expect, but we did not have such a tracking
1486                 * branch.
1487                 */
1488                if (ref->expect_old_sha1) {
1489                        if (ref->expect_old_no_trackback ||
1490                            hashcmp(ref->old_sha1, ref->old_sha1_expect))
1491                                reject_reason = REF_STATUS_REJECT_STALE;
1492                }
1493
1494                /*
1495                 * The usual "must fast-forward" rules.
1496                 *
1497                 * Decide whether an individual refspec A:B can be
1498                 * pushed.  The push will succeed if any of the
1499                 * following are true:
1500                 *
1501                 * (1) the remote reference B does not exist
1502                 *
1503                 * (2) the remote reference B is being removed (i.e.,
1504                 *     pushing :B where no source is specified)
1505                 *
1506                 * (3) the destination is not under refs/tags/, and
1507                 *     if the old and new value is a commit, the new
1508                 *     is a descendant of the old.
1509                 *
1510                 * (4) it is forced using the +A:B notation, or by
1511                 *     passing the --force argument
1512                 */
1513
1514                else if (!ref->deletion && !is_null_sha1(ref->old_sha1)) {
1515                        if (starts_with(ref->name, "refs/tags/"))
1516                                reject_reason = REF_STATUS_REJECT_ALREADY_EXISTS;
1517                        else if (!has_sha1_file(ref->old_sha1))
1518                                reject_reason = REF_STATUS_REJECT_FETCH_FIRST;
1519                        else if (!lookup_commit_reference_gently(ref->old_sha1, 1) ||
1520                                 !lookup_commit_reference_gently(ref->new_sha1, 1))
1521                                reject_reason = REF_STATUS_REJECT_NEEDS_FORCE;
1522                        else if (!ref_newer(ref->new_sha1, ref->old_sha1))
1523                                reject_reason = REF_STATUS_REJECT_NONFASTFORWARD;
1524                }
1525
1526                /*
1527                 * "--force" will defeat any rejection implemented
1528                 * by the rules above.
1529                 */
1530                if (!force_ref_update)
1531                        ref->status = reject_reason;
1532                else if (reject_reason)
1533                        ref->forced_update = 1;
1534        }
1535}
1536
1537struct branch *branch_get(const char *name)
1538{
1539        struct branch *ret;
1540
1541        read_config();
1542        if (!name || !*name || !strcmp(name, "HEAD"))
1543                ret = current_branch;
1544        else
1545                ret = make_branch(name, 0);
1546        if (ret && ret->remote_name) {
1547                ret->remote = remote_get(ret->remote_name);
1548                if (ret->merge_nr) {
1549                        int i;
1550                        ret->merge = xcalloc(ret->merge_nr, sizeof(*ret->merge));
1551                        for (i = 0; i < ret->merge_nr; i++) {
1552                                ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1553                                ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1554                                if (remote_find_tracking(ret->remote, ret->merge[i])
1555                                    && !strcmp(ret->remote_name, "."))
1556                                        ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1557                        }
1558                }
1559        }
1560        return ret;
1561}
1562
1563int branch_has_merge_config(struct branch *branch)
1564{
1565        return branch && !!branch->merge;
1566}
1567
1568int branch_merge_matches(struct branch *branch,
1569                                 int i,
1570                                 const char *refname)
1571{
1572        if (!branch || i < 0 || i >= branch->merge_nr)
1573                return 0;
1574        return refname_match(branch->merge[i]->src, refname);
1575}
1576
1577static int ignore_symref_update(const char *refname)
1578{
1579        unsigned char sha1[20];
1580        int flag;
1581
1582        if (!resolve_ref_unsafe(refname, sha1, 0, &flag))
1583                return 0; /* non-existing refs are OK */
1584        return (flag & REF_ISSYMREF);
1585}
1586
1587/*
1588 * Create and return a list of (struct ref) consisting of copies of
1589 * each remote_ref that matches refspec.  refspec must be a pattern.
1590 * Fill in the copies' peer_ref to describe the local tracking refs to
1591 * which they map.  Omit any references that would map to an existing
1592 * local symbolic ref.
1593 */
1594static struct ref *get_expanded_map(const struct ref *remote_refs,
1595                                    const struct refspec *refspec)
1596{
1597        const struct ref *ref;
1598        struct ref *ret = NULL;
1599        struct ref **tail = &ret;
1600
1601        for (ref = remote_refs; ref; ref = ref->next) {
1602                char *expn_name = NULL;
1603
1604                if (strchr(ref->name, '^'))
1605                        continue; /* a dereference item */
1606                if (match_name_with_pattern(refspec->src, ref->name,
1607                                            refspec->dst, &expn_name) &&
1608                    !ignore_symref_update(expn_name)) {
1609                        struct ref *cpy = copy_ref(ref);
1610
1611                        cpy->peer_ref = alloc_ref(expn_name);
1612                        if (refspec->force)
1613                                cpy->peer_ref->force = 1;
1614                        *tail = cpy;
1615                        tail = &cpy->next;
1616                }
1617                free(expn_name);
1618        }
1619
1620        return ret;
1621}
1622
1623static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1624{
1625        const struct ref *ref;
1626        for (ref = refs; ref; ref = ref->next) {
1627                if (refname_match(name, ref->name))
1628                        return ref;
1629        }
1630        return NULL;
1631}
1632
1633struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1634{
1635        const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1636
1637        if (!ref)
1638                return NULL;
1639
1640        return copy_ref(ref);
1641}
1642
1643static struct ref *get_local_ref(const char *name)
1644{
1645        if (!name || name[0] == '\0')
1646                return NULL;
1647
1648        if (starts_with(name, "refs/"))
1649                return alloc_ref(name);
1650
1651        if (starts_with(name, "heads/") ||
1652            starts_with(name, "tags/") ||
1653            starts_with(name, "remotes/"))
1654                return alloc_ref_with_prefix("refs/", 5, name);
1655
1656        return alloc_ref_with_prefix("refs/heads/", 11, name);
1657}
1658
1659int get_fetch_map(const struct ref *remote_refs,
1660                  const struct refspec *refspec,
1661                  struct ref ***tail,
1662                  int missing_ok)
1663{
1664        struct ref *ref_map, **rmp;
1665
1666        if (refspec->pattern) {
1667                ref_map = get_expanded_map(remote_refs, refspec);
1668        } else {
1669                const char *name = refspec->src[0] ? refspec->src : "HEAD";
1670
1671                if (refspec->exact_sha1) {
1672                        ref_map = alloc_ref(name);
1673                        get_sha1_hex(name, ref_map->old_sha1);
1674                } else {
1675                        ref_map = get_remote_ref(remote_refs, name);
1676                }
1677                if (!missing_ok && !ref_map)
1678                        die("Couldn't find remote ref %s", name);
1679                if (ref_map) {
1680                        ref_map->peer_ref = get_local_ref(refspec->dst);
1681                        if (ref_map->peer_ref && refspec->force)
1682                                ref_map->peer_ref->force = 1;
1683                }
1684        }
1685
1686        for (rmp = &ref_map; *rmp; ) {
1687                if ((*rmp)->peer_ref) {
1688                        if (!starts_with((*rmp)->peer_ref->name, "refs/") ||
1689                            check_refname_format((*rmp)->peer_ref->name, 0)) {
1690                                struct ref *ignore = *rmp;
1691                                error("* Ignoring funny ref '%s' locally",
1692                                      (*rmp)->peer_ref->name);
1693                                *rmp = (*rmp)->next;
1694                                free(ignore->peer_ref);
1695                                free(ignore);
1696                                continue;
1697                        }
1698                }
1699                rmp = &((*rmp)->next);
1700        }
1701
1702        if (ref_map)
1703                tail_link_ref(ref_map, tail);
1704
1705        return 0;
1706}
1707
1708int resolve_remote_symref(struct ref *ref, struct ref *list)
1709{
1710        if (!ref->symref)
1711                return 0;
1712        for (; list; list = list->next)
1713                if (!strcmp(ref->symref, list->name)) {
1714                        hashcpy(ref->old_sha1, list->old_sha1);
1715                        return 0;
1716                }
1717        return 1;
1718}
1719
1720static void unmark_and_free(struct commit_list *list, unsigned int mark)
1721{
1722        while (list) {
1723                struct commit_list *temp = list;
1724                temp->item->object.flags &= ~mark;
1725                list = temp->next;
1726                free(temp);
1727        }
1728}
1729
1730int ref_newer(const unsigned char *new_sha1, const unsigned char *old_sha1)
1731{
1732        struct object *o;
1733        struct commit *old, *new;
1734        struct commit_list *list, *used;
1735        int found = 0;
1736
1737        /*
1738         * Both new and old must be commit-ish and new is descendant of
1739         * old.  Otherwise we require --force.
1740         */
1741        o = deref_tag(parse_object(old_sha1), NULL, 0);
1742        if (!o || o->type != OBJ_COMMIT)
1743                return 0;
1744        old = (struct commit *) o;
1745
1746        o = deref_tag(parse_object(new_sha1), NULL, 0);
1747        if (!o || o->type != OBJ_COMMIT)
1748                return 0;
1749        new = (struct commit *) o;
1750
1751        if (parse_commit(new) < 0)
1752                return 0;
1753
1754        used = list = NULL;
1755        commit_list_insert(new, &list);
1756        while (list) {
1757                new = pop_most_recent_commit(&list, TMP_MARK);
1758                commit_list_insert(new, &used);
1759                if (new == old) {
1760                        found = 1;
1761                        break;
1762                }
1763        }
1764        unmark_and_free(list, TMP_MARK);
1765        unmark_and_free(used, TMP_MARK);
1766        return found;
1767}
1768
1769/*
1770 * Compare a branch with its upstream, and save their differences (number
1771 * of commits) in *num_ours and *num_theirs.
1772 *
1773 * Return 0 if branch has no upstream (no base), -1 if upstream is missing
1774 * (with "gone" base), otherwise 1 (with base).
1775 */
1776int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs)
1777{
1778        unsigned char sha1[20];
1779        struct commit *ours, *theirs;
1780        char symmetric[84];
1781        struct rev_info revs;
1782        const char *rev_argv[10], *base;
1783        int rev_argc;
1784
1785        /* Cannot stat unless we are marked to build on top of somebody else. */
1786        if (!branch ||
1787            !branch->merge || !branch->merge[0] || !branch->merge[0]->dst)
1788                return 0;
1789
1790        /* Cannot stat if what we used to build on no longer exists */
1791        base = branch->merge[0]->dst;
1792        if (read_ref(base, sha1))
1793                return -1;
1794        theirs = lookup_commit_reference(sha1);
1795        if (!theirs)
1796                return -1;
1797
1798        if (read_ref(branch->refname, sha1))
1799                return -1;
1800        ours = lookup_commit_reference(sha1);
1801        if (!ours)
1802                return -1;
1803
1804        /* are we the same? */
1805        if (theirs == ours) {
1806                *num_theirs = *num_ours = 0;
1807                return 1;
1808        }
1809
1810        /* Run "rev-list --left-right ours...theirs" internally... */
1811        rev_argc = 0;
1812        rev_argv[rev_argc++] = NULL;
1813        rev_argv[rev_argc++] = "--left-right";
1814        rev_argv[rev_argc++] = symmetric;
1815        rev_argv[rev_argc++] = "--";
1816        rev_argv[rev_argc] = NULL;
1817
1818        strcpy(symmetric, sha1_to_hex(ours->object.sha1));
1819        strcpy(symmetric + 40, "...");
1820        strcpy(symmetric + 43, sha1_to_hex(theirs->object.sha1));
1821
1822        init_revisions(&revs, NULL);
1823        setup_revisions(rev_argc, rev_argv, &revs, NULL);
1824        prepare_revision_walk(&revs);
1825
1826        /* ... and count the commits on each side. */
1827        *num_ours = 0;
1828        *num_theirs = 0;
1829        while (1) {
1830                struct commit *c = get_revision(&revs);
1831                if (!c)
1832                        break;
1833                if (c->object.flags & SYMMETRIC_LEFT)
1834                        (*num_ours)++;
1835                else
1836                        (*num_theirs)++;
1837        }
1838
1839        /* clear object flags smudged by the above traversal */
1840        clear_commit_marks(ours, ALL_REV_FLAGS);
1841        clear_commit_marks(theirs, ALL_REV_FLAGS);
1842        return 1;
1843}
1844
1845/*
1846 * Return true when there is anything to report, otherwise false.
1847 */
1848int format_tracking_info(struct branch *branch, struct strbuf *sb)
1849{
1850        int ours, theirs;
1851        const char *base;
1852        int upstream_is_gone = 0;
1853
1854        switch (stat_tracking_info(branch, &ours, &theirs)) {
1855        case 0:
1856                /* no base */
1857                return 0;
1858        case -1:
1859                /* with "gone" base */
1860                upstream_is_gone = 1;
1861                break;
1862        default:
1863                /* with base */
1864                break;
1865        }
1866
1867        base = branch->merge[0]->dst;
1868        base = shorten_unambiguous_ref(base, 0);
1869        if (upstream_is_gone) {
1870                strbuf_addf(sb,
1871                        _("Your branch is based on '%s', but the upstream is gone.\n"),
1872                        base);
1873                if (advice_status_hints)
1874                        strbuf_addf(sb,
1875                                _("  (use \"git branch --unset-upstream\" to fixup)\n"));
1876        } else if (!ours && !theirs) {
1877                strbuf_addf(sb,
1878                        _("Your branch is up-to-date with '%s'.\n"),
1879                        base);
1880        } else if (!theirs) {
1881                strbuf_addf(sb,
1882                        Q_("Your branch is ahead of '%s' by %d commit.\n",
1883                           "Your branch is ahead of '%s' by %d commits.\n",
1884                           ours),
1885                        base, ours);
1886                if (advice_status_hints)
1887                        strbuf_addf(sb,
1888                                _("  (use \"git push\" to publish your local commits)\n"));
1889        } else if (!ours) {
1890                strbuf_addf(sb,
1891                        Q_("Your branch is behind '%s' by %d commit, "
1892                               "and can be fast-forwarded.\n",
1893                           "Your branch is behind '%s' by %d commits, "
1894                               "and can be fast-forwarded.\n",
1895                           theirs),
1896                        base, theirs);
1897                if (advice_status_hints)
1898                        strbuf_addf(sb,
1899                                _("  (use \"git pull\" to update your local branch)\n"));
1900        } else {
1901                strbuf_addf(sb,
1902                        Q_("Your branch and '%s' have diverged,\n"
1903                               "and have %d and %d different commit each, "
1904                               "respectively.\n",
1905                           "Your branch and '%s' have diverged,\n"
1906                               "and have %d and %d different commits each, "
1907                               "respectively.\n",
1908                           theirs),
1909                        base, ours, theirs);
1910                if (advice_status_hints)
1911                        strbuf_addf(sb,
1912                                _("  (use \"git pull\" to merge the remote branch into yours)\n"));
1913        }
1914        return 1;
1915}
1916
1917static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
1918{
1919        struct ref ***local_tail = cb_data;
1920        struct ref *ref;
1921        int len;
1922
1923        /* we already know it starts with refs/ to get here */
1924        if (check_refname_format(refname + 5, 0))
1925                return 0;
1926
1927        len = strlen(refname) + 1;
1928        ref = xcalloc(1, sizeof(*ref) + len);
1929        hashcpy(ref->new_sha1, sha1);
1930        memcpy(ref->name, refname, len);
1931        **local_tail = ref;
1932        *local_tail = &ref->next;
1933        return 0;
1934}
1935
1936struct ref *get_local_heads(void)
1937{
1938        struct ref *local_refs = NULL, **local_tail = &local_refs;
1939        for_each_ref(one_local_ref, &local_tail);
1940        return local_refs;
1941}
1942
1943struct ref *guess_remote_head(const struct ref *head,
1944                              const struct ref *refs,
1945                              int all)
1946{
1947        const struct ref *r;
1948        struct ref *list = NULL;
1949        struct ref **tail = &list;
1950
1951        if (!head)
1952                return NULL;
1953
1954        /*
1955         * Some transports support directly peeking at
1956         * where HEAD points; if that is the case, then
1957         * we don't have to guess.
1958         */
1959        if (head->symref)
1960                return copy_ref(find_ref_by_name(refs, head->symref));
1961
1962        /* If refs/heads/master could be right, it is. */
1963        if (!all) {
1964                r = find_ref_by_name(refs, "refs/heads/master");
1965                if (r && !hashcmp(r->old_sha1, head->old_sha1))
1966                        return copy_ref(r);
1967        }
1968
1969        /* Look for another ref that points there */
1970        for (r = refs; r; r = r->next) {
1971                if (r != head &&
1972                    starts_with(r->name, "refs/heads/") &&
1973                    !hashcmp(r->old_sha1, head->old_sha1)) {
1974                        *tail = copy_ref(r);
1975                        tail = &((*tail)->next);
1976                        if (!all)
1977                                break;
1978                }
1979        }
1980
1981        return list;
1982}
1983
1984struct stale_heads_info {
1985        struct string_list *ref_names;
1986        struct ref **stale_refs_tail;
1987        struct refspec *refs;
1988        int ref_count;
1989};
1990
1991static int get_stale_heads_cb(const char *refname,
1992        const unsigned char *sha1, int flags, void *cb_data)
1993{
1994        struct stale_heads_info *info = cb_data;
1995        struct refspec query;
1996        memset(&query, 0, sizeof(struct refspec));
1997        query.dst = (char *)refname;
1998
1999        if (query_refspecs(info->refs, info->ref_count, &query))
2000                return 0; /* No matches */
2001
2002        /*
2003         * If we did find a suitable refspec and it's not a symref and
2004         * it's not in the list of refs that currently exist in that
2005         * remote we consider it to be stale.
2006         */
2007        if (!((flags & REF_ISSYMREF) ||
2008              string_list_has_string(info->ref_names, query.src))) {
2009                struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
2010                hashcpy(ref->new_sha1, sha1);
2011        }
2012
2013        free(query.src);
2014        return 0;
2015}
2016
2017struct ref *get_stale_heads(struct refspec *refs, int ref_count, struct ref *fetch_map)
2018{
2019        struct ref *ref, *stale_refs = NULL;
2020        struct string_list ref_names = STRING_LIST_INIT_NODUP;
2021        struct stale_heads_info info;
2022        info.ref_names = &ref_names;
2023        info.stale_refs_tail = &stale_refs;
2024        info.refs = refs;
2025        info.ref_count = ref_count;
2026        for (ref = fetch_map; ref; ref = ref->next)
2027                string_list_append(&ref_names, ref->name);
2028        sort_string_list(&ref_names);
2029        for_each_ref(get_stale_heads_cb, &info);
2030        string_list_clear(&ref_names, 0);
2031        return stale_refs;
2032}
2033
2034/*
2035 * Compare-and-swap
2036 */
2037void clear_cas_option(struct push_cas_option *cas)
2038{
2039        int i;
2040
2041        for (i = 0; i < cas->nr; i++)
2042                free(cas->entry[i].refname);
2043        free(cas->entry);
2044        memset(cas, 0, sizeof(*cas));
2045}
2046
2047static struct push_cas *add_cas_entry(struct push_cas_option *cas,
2048                                      const char *refname,
2049                                      size_t refnamelen)
2050{
2051        struct push_cas *entry;
2052        ALLOC_GROW(cas->entry, cas->nr + 1, cas->alloc);
2053        entry = &cas->entry[cas->nr++];
2054        memset(entry, 0, sizeof(*entry));
2055        entry->refname = xmemdupz(refname, refnamelen);
2056        return entry;
2057}
2058
2059int parse_push_cas_option(struct push_cas_option *cas, const char *arg, int unset)
2060{
2061        const char *colon;
2062        struct push_cas *entry;
2063
2064        if (unset) {
2065                /* "--no-<option>" */
2066                clear_cas_option(cas);
2067                return 0;
2068        }
2069
2070        if (!arg) {
2071                /* just "--<option>" */
2072                cas->use_tracking_for_rest = 1;
2073                return 0;
2074        }
2075
2076        /* "--<option>=refname" or "--<option>=refname:value" */
2077        colon = strchrnul(arg, ':');
2078        entry = add_cas_entry(cas, arg, colon - arg);
2079        if (!*colon)
2080                entry->use_tracking = 1;
2081        else if (get_sha1(colon + 1, entry->expect))
2082                return error("cannot parse expected object name '%s'", colon + 1);
2083        return 0;
2084}
2085
2086int parseopt_push_cas_option(const struct option *opt, const char *arg, int unset)
2087{
2088        return parse_push_cas_option(opt->value, arg, unset);
2089}
2090
2091int is_empty_cas(const struct push_cas_option *cas)
2092{
2093        return !cas->use_tracking_for_rest && !cas->nr;
2094}
2095
2096/*
2097 * Look at remote.fetch refspec and see if we have a remote
2098 * tracking branch for the refname there.  Fill its current
2099 * value in sha1[].
2100 * If we cannot do so, return negative to signal an error.
2101 */
2102static int remote_tracking(struct remote *remote, const char *refname,
2103                           unsigned char sha1[20])
2104{
2105        char *dst;
2106
2107        dst = apply_refspecs(remote->fetch, remote->fetch_refspec_nr, refname);
2108        if (!dst)
2109                return -1; /* no tracking ref for refname at remote */
2110        if (read_ref(dst, sha1))
2111                return -1; /* we know what the tracking ref is but we cannot read it */
2112        return 0;
2113}
2114
2115static void apply_cas(struct push_cas_option *cas,
2116                      struct remote *remote,
2117                      struct ref *ref)
2118{
2119        int i;
2120
2121        /* Find an explicit --<option>=<name>[:<value>] entry */
2122        for (i = 0; i < cas->nr; i++) {
2123                struct push_cas *entry = &cas->entry[i];
2124                if (!refname_match(entry->refname, ref->name))
2125                        continue;
2126                ref->expect_old_sha1 = 1;
2127                if (!entry->use_tracking)
2128                        hashcpy(ref->old_sha1_expect, cas->entry[i].expect);
2129                else if (remote_tracking(remote, ref->name, ref->old_sha1_expect))
2130                        ref->expect_old_no_trackback = 1;
2131                return;
2132        }
2133
2134        /* Are we using "--<option>" to cover all? */
2135        if (!cas->use_tracking_for_rest)
2136                return;
2137
2138        ref->expect_old_sha1 = 1;
2139        if (remote_tracking(remote, ref->name, ref->old_sha1_expect))
2140                ref->expect_old_no_trackback = 1;
2141}
2142
2143void apply_push_cas(struct push_cas_option *cas,
2144                    struct remote *remote,
2145                    struct ref *remote_refs)
2146{
2147        struct ref *ref;
2148        for (ref = remote_refs; ref; ref = ref->next)
2149                apply_cas(cas, remote, ref);
2150}