Andrew's git / gitweb.git / remote.c
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remote.con commit get_expanded_map(): avoid memory leak (e31a17f)
   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 (!prefixcmp(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 (!prefixcmp(buffer, "URL:")) {
 243                        value_list = 0;
 244                        s = buffer + 4;
 245                } else if (!prefixcmp(buffer, "Push:")) {
 246                        value_list = 1;
 247                        s = buffer + 5;
 248                } else if (!prefixcmp(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 (!prefixcmp(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 (!prefixcmp(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 (prefixcmp(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 = xstrdup("origin");
 487        current_branch = NULL;
 488        head_ref = resolve_ref_unsafe("HEAD", sha1, 0, &flag);
 489        if (head_ref && (flag & REF_ISSYMREF) &&
 490            !prefixcmp(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
 748void ref_remove_duplicates(struct ref *ref_map)
 749{
 750        struct string_list refs = STRING_LIST_INIT_NODUP;
 751        struct string_list_item *item = NULL;
 752        struct ref *prev = NULL, *next = NULL;
 753        for (; ref_map; prev = ref_map, ref_map = next) {
 754                next = ref_map->next;
 755                if (!ref_map->peer_ref)
 756                        continue;
 757
 758                item = string_list_lookup(&refs, ref_map->peer_ref->name);
 759                if (item) {
 760                        if (strcmp(((struct ref *)item->util)->name,
 761                                   ref_map->name))
 762                                die("%s tracks both %s and %s",
 763                                    ref_map->peer_ref->name,
 764                                    ((struct ref *)item->util)->name,
 765                                    ref_map->name);
 766                        prev->next = ref_map->next;
 767                        free(ref_map->peer_ref);
 768                        free(ref_map);
 769                        ref_map = prev; /* skip this; we freed it */
 770                        continue;
 771                }
 772
 773                item = string_list_insert(&refs, ref_map->peer_ref->name);
 774                item->util = ref_map;
 775        }
 776        string_list_clear(&refs, 0);
 777}
 778
 779int remote_has_url(struct remote *remote, const char *url)
 780{
 781        int i;
 782        for (i = 0; i < remote->url_nr; i++) {
 783                if (!strcmp(remote->url[i], url))
 784                        return 1;
 785        }
 786        return 0;
 787}
 788
 789static int match_name_with_pattern(const char *key, const char *name,
 790                                   const char *value, char **result)
 791{
 792        const char *kstar = strchr(key, '*');
 793        size_t klen;
 794        size_t ksuffixlen;
 795        size_t namelen;
 796        int ret;
 797        if (!kstar)
 798                die("Key '%s' of pattern had no '*'", key);
 799        klen = kstar - key;
 800        ksuffixlen = strlen(kstar + 1);
 801        namelen = strlen(name);
 802        ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
 803                !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
 804        if (ret && value) {
 805                const char *vstar = strchr(value, '*');
 806                size_t vlen;
 807                size_t vsuffixlen;
 808                if (!vstar)
 809                        die("Value '%s' of pattern has no '*'", value);
 810                vlen = vstar - value;
 811                vsuffixlen = strlen(vstar + 1);
 812                *result = xmalloc(vlen + vsuffixlen +
 813                                  strlen(name) -
 814                                  klen - ksuffixlen + 1);
 815                strncpy(*result, value, vlen);
 816                strncpy(*result + vlen,
 817                        name + klen, namelen - klen - ksuffixlen);
 818                strcpy(*result + vlen + namelen - klen - ksuffixlen,
 819                       vstar + 1);
 820        }
 821        return ret;
 822}
 823
 824static int query_refspecs(struct refspec *refs, int ref_count, struct refspec *query)
 825{
 826        int i;
 827        int find_src = !query->src;
 828
 829        if (find_src && !query->dst)
 830                return error("query_refspecs: need either src or dst");
 831
 832        for (i = 0; i < ref_count; i++) {
 833                struct refspec *refspec = &refs[i];
 834                const char *key = find_src ? refspec->dst : refspec->src;
 835                const char *value = find_src ? refspec->src : refspec->dst;
 836                const char *needle = find_src ? query->dst : query->src;
 837                char **result = find_src ? &query->src : &query->dst;
 838
 839                if (!refspec->dst)
 840                        continue;
 841                if (refspec->pattern) {
 842                        if (match_name_with_pattern(key, needle, value, result)) {
 843                                query->force = refspec->force;
 844                                return 0;
 845                        }
 846                } else if (!strcmp(needle, key)) {
 847                        *result = xstrdup(value);
 848                        query->force = refspec->force;
 849                        return 0;
 850                }
 851        }
 852        return -1;
 853}
 854
 855char *apply_refspecs(struct refspec *refspecs, int nr_refspec,
 856                     const char *name)
 857{
 858        struct refspec query;
 859
 860        memset(&query, 0, sizeof(struct refspec));
 861        query.src = (char *)name;
 862
 863        if (query_refspecs(refspecs, nr_refspec, &query))
 864                return NULL;
 865
 866        return query.dst;
 867}
 868
 869int remote_find_tracking(struct remote *remote, struct refspec *refspec)
 870{
 871        return query_refspecs(remote->fetch, remote->fetch_refspec_nr, refspec);
 872}
 873
 874static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
 875                const char *name)
 876{
 877        size_t len = strlen(name);
 878        struct ref *ref = xcalloc(1, sizeof(struct ref) + prefixlen + len + 1);
 879        memcpy(ref->name, prefix, prefixlen);
 880        memcpy(ref->name + prefixlen, name, len);
 881        return ref;
 882}
 883
 884struct ref *alloc_ref(const char *name)
 885{
 886        return alloc_ref_with_prefix("", 0, name);
 887}
 888
 889struct ref *copy_ref(const struct ref *ref)
 890{
 891        struct ref *cpy;
 892        size_t len;
 893        if (!ref)
 894                return NULL;
 895        len = strlen(ref->name);
 896        cpy = xmalloc(sizeof(struct ref) + len + 1);
 897        memcpy(cpy, ref, sizeof(struct ref) + len + 1);
 898        cpy->next = NULL;
 899        cpy->symref = ref->symref ? xstrdup(ref->symref) : NULL;
 900        cpy->remote_status = ref->remote_status ? xstrdup(ref->remote_status) : NULL;
 901        cpy->peer_ref = copy_ref(ref->peer_ref);
 902        return cpy;
 903}
 904
 905struct ref *copy_ref_list(const struct ref *ref)
 906{
 907        struct ref *ret = NULL;
 908        struct ref **tail = &ret;
 909        while (ref) {
 910                *tail = copy_ref(ref);
 911                ref = ref->next;
 912                tail = &((*tail)->next);
 913        }
 914        return ret;
 915}
 916
 917static void free_ref(struct ref *ref)
 918{
 919        if (!ref)
 920                return;
 921        free_ref(ref->peer_ref);
 922        free(ref->remote_status);
 923        free(ref->symref);
 924        free(ref);
 925}
 926
 927void free_refs(struct ref *ref)
 928{
 929        struct ref *next;
 930        while (ref) {
 931                next = ref->next;
 932                free_ref(ref);
 933                ref = next;
 934        }
 935}
 936
 937int ref_compare_name(const void *va, const void *vb)
 938{
 939        const struct ref *a = va, *b = vb;
 940        return strcmp(a->name, b->name);
 941}
 942
 943static void *ref_list_get_next(const void *a)
 944{
 945        return ((const struct ref *)a)->next;
 946}
 947
 948static void ref_list_set_next(void *a, void *next)
 949{
 950        ((struct ref *)a)->next = next;
 951}
 952
 953void sort_ref_list(struct ref **l, int (*cmp)(const void *, const void *))
 954{
 955        *l = llist_mergesort(*l, ref_list_get_next, ref_list_set_next, cmp);
 956}
 957
 958static int count_refspec_match(const char *pattern,
 959                               struct ref *refs,
 960                               struct ref **matched_ref)
 961{
 962        int patlen = strlen(pattern);
 963        struct ref *matched_weak = NULL;
 964        struct ref *matched = NULL;
 965        int weak_match = 0;
 966        int match = 0;
 967
 968        for (weak_match = match = 0; refs; refs = refs->next) {
 969                char *name = refs->name;
 970                int namelen = strlen(name);
 971
 972                if (!refname_match(pattern, name, ref_rev_parse_rules))
 973                        continue;
 974
 975                /* A match is "weak" if it is with refs outside
 976                 * heads or tags, and did not specify the pattern
 977                 * in full (e.g. "refs/remotes/origin/master") or at
 978                 * least from the toplevel (e.g. "remotes/origin/master");
 979                 * otherwise "git push $URL master" would result in
 980                 * ambiguity between remotes/origin/master and heads/master
 981                 * at the remote site.
 982                 */
 983                if (namelen != patlen &&
 984                    patlen != namelen - 5 &&
 985                    prefixcmp(name, "refs/heads/") &&
 986                    prefixcmp(name, "refs/tags/")) {
 987                        /* We want to catch the case where only weak
 988                         * matches are found and there are multiple
 989                         * matches, and where more than one strong
 990                         * matches are found, as ambiguous.  One
 991                         * strong match with zero or more weak matches
 992                         * are acceptable as a unique match.
 993                         */
 994                        matched_weak = refs;
 995                        weak_match++;
 996                }
 997                else {
 998                        matched = refs;
 999                        match++;
1000                }
1001        }
1002        if (!matched) {
1003                *matched_ref = matched_weak;
1004                return weak_match;
1005        }
1006        else {
1007                *matched_ref = matched;
1008                return match;
1009        }
1010}
1011
1012static void tail_link_ref(struct ref *ref, struct ref ***tail)
1013{
1014        **tail = ref;
1015        while (ref->next)
1016                ref = ref->next;
1017        *tail = &ref->next;
1018}
1019
1020static struct ref *alloc_delete_ref(void)
1021{
1022        struct ref *ref = alloc_ref("(delete)");
1023        hashclr(ref->new_sha1);
1024        return ref;
1025}
1026
1027static struct ref *try_explicit_object_name(const char *name)
1028{
1029        unsigned char sha1[20];
1030        struct ref *ref;
1031
1032        if (!*name)
1033                return alloc_delete_ref();
1034        if (get_sha1(name, sha1))
1035                return NULL;
1036        ref = alloc_ref(name);
1037        hashcpy(ref->new_sha1, sha1);
1038        return ref;
1039}
1040
1041static struct ref *make_linked_ref(const char *name, struct ref ***tail)
1042{
1043        struct ref *ret = alloc_ref(name);
1044        tail_link_ref(ret, tail);
1045        return ret;
1046}
1047
1048static char *guess_ref(const char *name, struct ref *peer)
1049{
1050        struct strbuf buf = STRBUF_INIT;
1051        unsigned char sha1[20];
1052
1053        const char *r = resolve_ref_unsafe(peer->name, sha1, 1, NULL);
1054        if (!r)
1055                return NULL;
1056
1057        if (!prefixcmp(r, "refs/heads/"))
1058                strbuf_addstr(&buf, "refs/heads/");
1059        else if (!prefixcmp(r, "refs/tags/"))
1060                strbuf_addstr(&buf, "refs/tags/");
1061        else
1062                return NULL;
1063
1064        strbuf_addstr(&buf, name);
1065        return strbuf_detach(&buf, NULL);
1066}
1067
1068static int match_explicit(struct ref *src, struct ref *dst,
1069                          struct ref ***dst_tail,
1070                          struct refspec *rs)
1071{
1072        struct ref *matched_src, *matched_dst;
1073        int copy_src;
1074
1075        const char *dst_value = rs->dst;
1076        char *dst_guess;
1077
1078        if (rs->pattern || rs->matching)
1079                return 0;
1080
1081        matched_src = matched_dst = NULL;
1082        switch (count_refspec_match(rs->src, src, &matched_src)) {
1083        case 1:
1084                copy_src = 1;
1085                break;
1086        case 0:
1087                /* The source could be in the get_sha1() format
1088                 * not a reference name.  :refs/other is a
1089                 * way to delete 'other' ref at the remote end.
1090                 */
1091                matched_src = try_explicit_object_name(rs->src);
1092                if (!matched_src)
1093                        return error("src refspec %s does not match any.", rs->src);
1094                copy_src = 0;
1095                break;
1096        default:
1097                return error("src refspec %s matches more than one.", rs->src);
1098        }
1099
1100        if (!dst_value) {
1101                unsigned char sha1[20];
1102                int flag;
1103
1104                dst_value = resolve_ref_unsafe(matched_src->name, sha1, 1, &flag);
1105                if (!dst_value ||
1106                    ((flag & REF_ISSYMREF) &&
1107                     prefixcmp(dst_value, "refs/heads/")))
1108                        die("%s cannot be resolved to branch.",
1109                            matched_src->name);
1110        }
1111
1112        switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1113        case 1:
1114                break;
1115        case 0:
1116                if (!memcmp(dst_value, "refs/", 5))
1117                        matched_dst = make_linked_ref(dst_value, dst_tail);
1118                else if (is_null_sha1(matched_src->new_sha1))
1119                        error("unable to delete '%s': remote ref does not exist",
1120                              dst_value);
1121                else if ((dst_guess = guess_ref(dst_value, matched_src)))
1122                        matched_dst = make_linked_ref(dst_guess, dst_tail);
1123                else
1124                        error("unable to push to unqualified destination: %s\n"
1125                              "The destination refspec neither matches an "
1126                              "existing ref on the remote nor\n"
1127                              "begins with refs/, and we are unable to "
1128                              "guess a prefix based on the source ref.",
1129                              dst_value);
1130                break;
1131        default:
1132                matched_dst = NULL;
1133                error("dst refspec %s matches more than one.",
1134                      dst_value);
1135                break;
1136        }
1137        if (!matched_dst)
1138                return -1;
1139        if (matched_dst->peer_ref)
1140                return error("dst ref %s receives from more than one src.",
1141                      matched_dst->name);
1142        else {
1143                matched_dst->peer_ref = copy_src ? copy_ref(matched_src) : matched_src;
1144                matched_dst->force = rs->force;
1145        }
1146        return 0;
1147}
1148
1149static int match_explicit_refs(struct ref *src, struct ref *dst,
1150                               struct ref ***dst_tail, struct refspec *rs,
1151                               int rs_nr)
1152{
1153        int i, errs;
1154        for (i = errs = 0; i < rs_nr; i++)
1155                errs += match_explicit(src, dst, dst_tail, &rs[i]);
1156        return errs;
1157}
1158
1159static char *get_ref_match(const struct refspec *rs, int rs_nr, const struct ref *ref,
1160                int send_mirror, int direction, const struct refspec **ret_pat)
1161{
1162        const struct refspec *pat;
1163        char *name;
1164        int i;
1165        int matching_refs = -1;
1166        for (i = 0; i < rs_nr; i++) {
1167                if (rs[i].matching &&
1168                    (matching_refs == -1 || rs[i].force)) {
1169                        matching_refs = i;
1170                        continue;
1171                }
1172
1173                if (rs[i].pattern) {
1174                        const char *dst_side = rs[i].dst ? rs[i].dst : rs[i].src;
1175                        int match;
1176                        if (direction == FROM_SRC)
1177                                match = match_name_with_pattern(rs[i].src, ref->name, dst_side, &name);
1178                        else
1179                                match = match_name_with_pattern(dst_side, ref->name, rs[i].src, &name);
1180                        if (match) {
1181                                matching_refs = i;
1182                                break;
1183                        }
1184                }
1185        }
1186        if (matching_refs == -1)
1187                return NULL;
1188
1189        pat = rs + matching_refs;
1190        if (pat->matching) {
1191                /*
1192                 * "matching refs"; traditionally we pushed everything
1193                 * including refs outside refs/heads/ hierarchy, but
1194                 * that does not make much sense these days.
1195                 */
1196                if (!send_mirror && prefixcmp(ref->name, "refs/heads/"))
1197                        return NULL;
1198                name = xstrdup(ref->name);
1199        }
1200        if (ret_pat)
1201                *ret_pat = pat;
1202        return name;
1203}
1204
1205static struct ref **tail_ref(struct ref **head)
1206{
1207        struct ref **tail = head;
1208        while (*tail)
1209                tail = &((*tail)->next);
1210        return tail;
1211}
1212
1213struct tips {
1214        struct commit **tip;
1215        int nr, alloc;
1216};
1217
1218static void add_to_tips(struct tips *tips, const unsigned char *sha1)
1219{
1220        struct commit *commit;
1221
1222        if (is_null_sha1(sha1))
1223                return;
1224        commit = lookup_commit_reference_gently(sha1, 1);
1225        if (!commit || (commit->object.flags & TMP_MARK))
1226                return;
1227        commit->object.flags |= TMP_MARK;
1228        ALLOC_GROW(tips->tip, tips->nr + 1, tips->alloc);
1229        tips->tip[tips->nr++] = commit;
1230}
1231
1232static void add_missing_tags(struct ref *src, struct ref **dst, struct ref ***dst_tail)
1233{
1234        struct string_list dst_tag = STRING_LIST_INIT_NODUP;
1235        struct string_list src_tag = STRING_LIST_INIT_NODUP;
1236        struct string_list_item *item;
1237        struct ref *ref;
1238        struct tips sent_tips;
1239
1240        /*
1241         * Collect everything we know they would have at the end of
1242         * this push, and collect all tags they have.
1243         */
1244        memset(&sent_tips, 0, sizeof(sent_tips));
1245        for (ref = *dst; ref; ref = ref->next) {
1246                if (ref->peer_ref &&
1247                    !is_null_sha1(ref->peer_ref->new_sha1))
1248                        add_to_tips(&sent_tips, ref->peer_ref->new_sha1);
1249                else
1250                        add_to_tips(&sent_tips, ref->old_sha1);
1251                if (!prefixcmp(ref->name, "refs/tags/"))
1252                        string_list_append(&dst_tag, ref->name);
1253        }
1254        clear_commit_marks_many(sent_tips.nr, sent_tips.tip, TMP_MARK);
1255
1256        sort_string_list(&dst_tag);
1257
1258        /* Collect tags they do not have. */
1259        for (ref = src; ref; ref = ref->next) {
1260                if (prefixcmp(ref->name, "refs/tags/"))
1261                        continue; /* not a tag */
1262                if (string_list_has_string(&dst_tag, ref->name))
1263                        continue; /* they already have it */
1264                if (sha1_object_info(ref->new_sha1, NULL) != OBJ_TAG)
1265                        continue; /* be conservative */
1266                item = string_list_append(&src_tag, ref->name);
1267                item->util = ref;
1268        }
1269        string_list_clear(&dst_tag, 0);
1270
1271        /*
1272         * At this point, src_tag lists tags that are missing from
1273         * dst, and sent_tips lists the tips we are pushing or those
1274         * that we know they already have. An element in the src_tag
1275         * that is an ancestor of any of the sent_tips needs to be
1276         * sent to the other side.
1277         */
1278        if (sent_tips.nr) {
1279                for_each_string_list_item(item, &src_tag) {
1280                        struct ref *ref = item->util;
1281                        struct ref *dst_ref;
1282                        struct commit *commit;
1283
1284                        if (is_null_sha1(ref->new_sha1))
1285                                continue;
1286                        commit = lookup_commit_reference_gently(ref->new_sha1, 1);
1287                        if (!commit)
1288                                /* not pushing a commit, which is not an error */
1289                                continue;
1290
1291                        /*
1292                         * Is this tag, which they do not have, reachable from
1293                         * any of the commits we are sending?
1294                         */
1295                        if (!in_merge_bases_many(commit, sent_tips.nr, sent_tips.tip))
1296                                continue;
1297
1298                        /* Add it in */
1299                        dst_ref = make_linked_ref(ref->name, dst_tail);
1300                        hashcpy(dst_ref->new_sha1, ref->new_sha1);
1301                        dst_ref->peer_ref = copy_ref(ref);
1302                }
1303        }
1304        string_list_clear(&src_tag, 0);
1305        free(sent_tips.tip);
1306}
1307
1308struct ref *find_ref_by_name(const struct ref *list, const char *name)
1309{
1310        for ( ; list; list = list->next)
1311                if (!strcmp(list->name, name))
1312                        return (struct ref *)list;
1313        return NULL;
1314}
1315
1316static void prepare_ref_index(struct string_list *ref_index, struct ref *ref)
1317{
1318        for ( ; ref; ref = ref->next)
1319                string_list_append_nodup(ref_index, ref->name)->util = ref;
1320
1321        sort_string_list(ref_index);
1322}
1323
1324/*
1325 * Given the set of refs the local repository has, the set of refs the
1326 * remote repository has, and the refspec used for push, determine
1327 * what remote refs we will update and with what value by setting
1328 * peer_ref (which object is being pushed) and force (if the push is
1329 * forced) in elements of "dst". The function may add new elements to
1330 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
1331 */
1332int match_push_refs(struct ref *src, struct ref **dst,
1333                    int nr_refspec, const char **refspec, int flags)
1334{
1335        struct refspec *rs;
1336        int send_all = flags & MATCH_REFS_ALL;
1337        int send_mirror = flags & MATCH_REFS_MIRROR;
1338        int send_prune = flags & MATCH_REFS_PRUNE;
1339        int errs;
1340        static const char *default_refspec[] = { ":", NULL };
1341        struct ref *ref, **dst_tail = tail_ref(dst);
1342        struct string_list dst_ref_index = STRING_LIST_INIT_NODUP;
1343
1344        if (!nr_refspec) {
1345                nr_refspec = 1;
1346                refspec = default_refspec;
1347        }
1348        rs = parse_push_refspec(nr_refspec, (const char **) refspec);
1349        errs = match_explicit_refs(src, *dst, &dst_tail, rs, nr_refspec);
1350
1351        /* pick the remainder */
1352        for (ref = src; ref; ref = ref->next) {
1353                struct string_list_item *dst_item;
1354                struct ref *dst_peer;
1355                const struct refspec *pat = NULL;
1356                char *dst_name;
1357
1358                dst_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_SRC, &pat);
1359                if (!dst_name)
1360                        continue;
1361
1362                if (!dst_ref_index.nr)
1363                        prepare_ref_index(&dst_ref_index, *dst);
1364
1365                dst_item = string_list_lookup(&dst_ref_index, dst_name);
1366                dst_peer = dst_item ? dst_item->util : NULL;
1367                if (dst_peer) {
1368                        if (dst_peer->peer_ref)
1369                                /* We're already sending something to this ref. */
1370                                goto free_name;
1371                } else {
1372                        if (pat->matching && !(send_all || send_mirror))
1373                                /*
1374                                 * Remote doesn't have it, and we have no
1375                                 * explicit pattern, and we don't have
1376                                 * --all nor --mirror.
1377                                 */
1378                                goto free_name;
1379
1380                        /* Create a new one and link it */
1381                        dst_peer = make_linked_ref(dst_name, &dst_tail);
1382                        hashcpy(dst_peer->new_sha1, ref->new_sha1);
1383                        string_list_insert(&dst_ref_index,
1384                                dst_peer->name)->util = dst_peer;
1385                }
1386                dst_peer->peer_ref = copy_ref(ref);
1387                dst_peer->force = pat->force;
1388        free_name:
1389                free(dst_name);
1390        }
1391
1392        string_list_clear(&dst_ref_index, 0);
1393
1394        if (flags & MATCH_REFS_FOLLOW_TAGS)
1395                add_missing_tags(src, dst, &dst_tail);
1396
1397        if (send_prune) {
1398                struct string_list src_ref_index = STRING_LIST_INIT_NODUP;
1399                /* check for missing refs on the remote */
1400                for (ref = *dst; ref; ref = ref->next) {
1401                        char *src_name;
1402
1403                        if (ref->peer_ref)
1404                                /* We're already sending something to this ref. */
1405                                continue;
1406
1407                        src_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_DST, NULL);
1408                        if (src_name) {
1409                                if (!src_ref_index.nr)
1410                                        prepare_ref_index(&src_ref_index, src);
1411                                if (!string_list_has_string(&src_ref_index,
1412                                            src_name))
1413                                        ref->peer_ref = alloc_delete_ref();
1414                                free(src_name);
1415                        }
1416                }
1417                string_list_clear(&src_ref_index, 0);
1418        }
1419        if (errs)
1420                return -1;
1421        return 0;
1422}
1423
1424void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1425                             int force_update)
1426{
1427        struct ref *ref;
1428
1429        for (ref = remote_refs; ref; ref = ref->next) {
1430                int force_ref_update = ref->force || force_update;
1431                int reject_reason = 0;
1432
1433                if (ref->peer_ref)
1434                        hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
1435                else if (!send_mirror)
1436                        continue;
1437
1438                ref->deletion = is_null_sha1(ref->new_sha1);
1439                if (!ref->deletion &&
1440                        !hashcmp(ref->old_sha1, ref->new_sha1)) {
1441                        ref->status = REF_STATUS_UPTODATE;
1442                        continue;
1443                }
1444
1445                /*
1446                 * Bypass the usual "must fast-forward" check but
1447                 * replace it with a weaker "the old value must be
1448                 * this value we observed".  If the remote ref has
1449                 * moved and is now different from what we expect,
1450                 * reject any push.
1451                 *
1452                 * It also is an error if the user told us to check
1453                 * with the remote-tracking branch to find the value
1454                 * to expect, but we did not have such a tracking
1455                 * branch.
1456                 */
1457                if (ref->expect_old_sha1) {
1458                        if (ref->expect_old_no_trackback ||
1459                            hashcmp(ref->old_sha1, ref->old_sha1_expect))
1460                                reject_reason = REF_STATUS_REJECT_STALE;
1461                }
1462
1463                /*
1464                 * The usual "must fast-forward" rules.
1465                 *
1466                 * Decide whether an individual refspec A:B can be
1467                 * pushed.  The push will succeed if any of the
1468                 * following are true:
1469                 *
1470                 * (1) the remote reference B does not exist
1471                 *
1472                 * (2) the remote reference B is being removed (i.e.,
1473                 *     pushing :B where no source is specified)
1474                 *
1475                 * (3) the destination is not under refs/tags/, and
1476                 *     if the old and new value is a commit, the new
1477                 *     is a descendant of the old.
1478                 *
1479                 * (4) it is forced using the +A:B notation, or by
1480                 *     passing the --force argument
1481                 */
1482
1483                else if (!ref->deletion && !is_null_sha1(ref->old_sha1)) {
1484                        if (!prefixcmp(ref->name, "refs/tags/"))
1485                                reject_reason = REF_STATUS_REJECT_ALREADY_EXISTS;
1486                        else if (!has_sha1_file(ref->old_sha1))
1487                                reject_reason = REF_STATUS_REJECT_FETCH_FIRST;
1488                        else if (!lookup_commit_reference_gently(ref->old_sha1, 1) ||
1489                                 !lookup_commit_reference_gently(ref->new_sha1, 1))
1490                                reject_reason = REF_STATUS_REJECT_NEEDS_FORCE;
1491                        else if (!ref_newer(ref->new_sha1, ref->old_sha1))
1492                                reject_reason = REF_STATUS_REJECT_NONFASTFORWARD;
1493                }
1494
1495                /*
1496                 * "--force" will defeat any rejection implemented
1497                 * by the rules above.
1498                 */
1499                if (!force_ref_update)
1500                        ref->status = reject_reason;
1501                else if (reject_reason)
1502                        ref->forced_update = 1;
1503        }
1504}
1505
1506struct branch *branch_get(const char *name)
1507{
1508        struct branch *ret;
1509
1510        read_config();
1511        if (!name || !*name || !strcmp(name, "HEAD"))
1512                ret = current_branch;
1513        else
1514                ret = make_branch(name, 0);
1515        if (ret && ret->remote_name) {
1516                ret->remote = remote_get(ret->remote_name);
1517                if (ret->merge_nr) {
1518                        int i;
1519                        ret->merge = xcalloc(ret->merge_nr, sizeof(*ret->merge));
1520                        for (i = 0; i < ret->merge_nr; i++) {
1521                                ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1522                                ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1523                                if (remote_find_tracking(ret->remote, ret->merge[i])
1524                                    && !strcmp(ret->remote_name, "."))
1525                                        ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1526                        }
1527                }
1528        }
1529        return ret;
1530}
1531
1532int branch_has_merge_config(struct branch *branch)
1533{
1534        return branch && !!branch->merge;
1535}
1536
1537int branch_merge_matches(struct branch *branch,
1538                                 int i,
1539                                 const char *refname)
1540{
1541        if (!branch || i < 0 || i >= branch->merge_nr)
1542                return 0;
1543        return refname_match(branch->merge[i]->src, refname, ref_fetch_rules);
1544}
1545
1546static int ignore_symref_update(const char *refname)
1547{
1548        unsigned char sha1[20];
1549        int flag;
1550
1551        if (!resolve_ref_unsafe(refname, sha1, 0, &flag))
1552                return 0; /* non-existing refs are OK */
1553        return (flag & REF_ISSYMREF);
1554}
1555
1556/*
1557 * Create and return a list of (struct ref) consisting of copies of
1558 * each remote_ref that matches refspec.  refspec must be a pattern.
1559 * Fill in the copies' peer_ref to describe the local tracking refs to
1560 * which they map.  Omit any references that would map to an existing
1561 * local symbolic ref.
1562 */
1563static struct ref *get_expanded_map(const struct ref *remote_refs,
1564                                    const struct refspec *refspec)
1565{
1566        const struct ref *ref;
1567        struct ref *ret = NULL;
1568        struct ref **tail = &ret;
1569
1570        for (ref = remote_refs; ref; ref = ref->next) {
1571                char *expn_name = NULL;
1572
1573                if (strchr(ref->name, '^'))
1574                        continue; /* a dereference item */
1575                if (match_name_with_pattern(refspec->src, ref->name,
1576                                            refspec->dst, &expn_name) &&
1577                    !ignore_symref_update(expn_name)) {
1578                        struct ref *cpy = copy_ref(ref);
1579
1580                        cpy->peer_ref = alloc_ref(expn_name);
1581                        if (refspec->force)
1582                                cpy->peer_ref->force = 1;
1583                        *tail = cpy;
1584                        tail = &cpy->next;
1585                }
1586                free(expn_name);
1587        }
1588
1589        return ret;
1590}
1591
1592static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1593{
1594        const struct ref *ref;
1595        for (ref = refs; ref; ref = ref->next) {
1596                if (refname_match(name, ref->name, ref_fetch_rules))
1597                        return ref;
1598        }
1599        return NULL;
1600}
1601
1602struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1603{
1604        const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1605
1606        if (!ref)
1607                return NULL;
1608
1609        return copy_ref(ref);
1610}
1611
1612static struct ref *get_local_ref(const char *name)
1613{
1614        if (!name || name[0] == '\0')
1615                return NULL;
1616
1617        if (!prefixcmp(name, "refs/"))
1618                return alloc_ref(name);
1619
1620        if (!prefixcmp(name, "heads/") ||
1621            !prefixcmp(name, "tags/") ||
1622            !prefixcmp(name, "remotes/"))
1623                return alloc_ref_with_prefix("refs/", 5, name);
1624
1625        return alloc_ref_with_prefix("refs/heads/", 11, name);
1626}
1627
1628int get_fetch_map(const struct ref *remote_refs,
1629                  const struct refspec *refspec,
1630                  struct ref ***tail,
1631                  int missing_ok)
1632{
1633        struct ref *ref_map, **rmp;
1634
1635        if (refspec->pattern) {
1636                ref_map = get_expanded_map(remote_refs, refspec);
1637        } else {
1638                const char *name = refspec->src[0] ? refspec->src : "HEAD";
1639
1640                if (refspec->exact_sha1) {
1641                        ref_map = alloc_ref(name);
1642                        get_sha1_hex(name, ref_map->old_sha1);
1643                } else {
1644                        ref_map = get_remote_ref(remote_refs, name);
1645                }
1646                if (!missing_ok && !ref_map)
1647                        die("Couldn't find remote ref %s", name);
1648                if (ref_map) {
1649                        ref_map->peer_ref = get_local_ref(refspec->dst);
1650                        if (ref_map->peer_ref && refspec->force)
1651                                ref_map->peer_ref->force = 1;
1652                }
1653        }
1654
1655        for (rmp = &ref_map; *rmp; ) {
1656                if ((*rmp)->peer_ref) {
1657                        if (prefixcmp((*rmp)->peer_ref->name, "refs/") ||
1658                            check_refname_format((*rmp)->peer_ref->name, 0)) {
1659                                struct ref *ignore = *rmp;
1660                                error("* Ignoring funny ref '%s' locally",
1661                                      (*rmp)->peer_ref->name);
1662                                *rmp = (*rmp)->next;
1663                                free(ignore->peer_ref);
1664                                free(ignore);
1665                                continue;
1666                        }
1667                }
1668                rmp = &((*rmp)->next);
1669        }
1670
1671        if (ref_map)
1672                tail_link_ref(ref_map, tail);
1673
1674        return 0;
1675}
1676
1677int resolve_remote_symref(struct ref *ref, struct ref *list)
1678{
1679        if (!ref->symref)
1680                return 0;
1681        for (; list; list = list->next)
1682                if (!strcmp(ref->symref, list->name)) {
1683                        hashcpy(ref->old_sha1, list->old_sha1);
1684                        return 0;
1685                }
1686        return 1;
1687}
1688
1689static void unmark_and_free(struct commit_list *list, unsigned int mark)
1690{
1691        while (list) {
1692                struct commit_list *temp = list;
1693                temp->item->object.flags &= ~mark;
1694                list = temp->next;
1695                free(temp);
1696        }
1697}
1698
1699int ref_newer(const unsigned char *new_sha1, const unsigned char *old_sha1)
1700{
1701        struct object *o;
1702        struct commit *old, *new;
1703        struct commit_list *list, *used;
1704        int found = 0;
1705
1706        /*
1707         * Both new and old must be commit-ish and new is descendant of
1708         * old.  Otherwise we require --force.
1709         */
1710        o = deref_tag(parse_object(old_sha1), NULL, 0);
1711        if (!o || o->type != OBJ_COMMIT)
1712                return 0;
1713        old = (struct commit *) o;
1714
1715        o = deref_tag(parse_object(new_sha1), NULL, 0);
1716        if (!o || o->type != OBJ_COMMIT)
1717                return 0;
1718        new = (struct commit *) o;
1719
1720        if (parse_commit(new) < 0)
1721                return 0;
1722
1723        used = list = NULL;
1724        commit_list_insert(new, &list);
1725        while (list) {
1726                new = pop_most_recent_commit(&list, TMP_MARK);
1727                commit_list_insert(new, &used);
1728                if (new == old) {
1729                        found = 1;
1730                        break;
1731                }
1732        }
1733        unmark_and_free(list, TMP_MARK);
1734        unmark_and_free(used, TMP_MARK);
1735        return found;
1736}
1737
1738/*
1739 * Compare a branch with its upstream, and save their differences (number
1740 * of commits) in *num_ours and *num_theirs.
1741 *
1742 * Return 0 if branch has no upstream (no base), -1 if upstream is missing
1743 * (with "gone" base), otherwise 1 (with base).
1744 */
1745int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs)
1746{
1747        unsigned char sha1[20];
1748        struct commit *ours, *theirs;
1749        char symmetric[84];
1750        struct rev_info revs;
1751        const char *rev_argv[10], *base;
1752        int rev_argc;
1753
1754        /* Cannot stat unless we are marked to build on top of somebody else. */
1755        if (!branch ||
1756            !branch->merge || !branch->merge[0] || !branch->merge[0]->dst)
1757                return 0;
1758
1759        /* Cannot stat if what we used to build on no longer exists */
1760        base = branch->merge[0]->dst;
1761        if (read_ref(base, sha1))
1762                return -1;
1763        theirs = lookup_commit_reference(sha1);
1764        if (!theirs)
1765                return -1;
1766
1767        if (read_ref(branch->refname, sha1))
1768                return -1;
1769        ours = lookup_commit_reference(sha1);
1770        if (!ours)
1771                return -1;
1772
1773        /* are we the same? */
1774        if (theirs == ours) {
1775                *num_theirs = *num_ours = 0;
1776                return 1;
1777        }
1778
1779        /* Run "rev-list --left-right ours...theirs" internally... */
1780        rev_argc = 0;
1781        rev_argv[rev_argc++] = NULL;
1782        rev_argv[rev_argc++] = "--left-right";
1783        rev_argv[rev_argc++] = symmetric;
1784        rev_argv[rev_argc++] = "--";
1785        rev_argv[rev_argc] = NULL;
1786
1787        strcpy(symmetric, sha1_to_hex(ours->object.sha1));
1788        strcpy(symmetric + 40, "...");
1789        strcpy(symmetric + 43, sha1_to_hex(theirs->object.sha1));
1790
1791        init_revisions(&revs, NULL);
1792        setup_revisions(rev_argc, rev_argv, &revs, NULL);
1793        prepare_revision_walk(&revs);
1794
1795        /* ... and count the commits on each side. */
1796        *num_ours = 0;
1797        *num_theirs = 0;
1798        while (1) {
1799                struct commit *c = get_revision(&revs);
1800                if (!c)
1801                        break;
1802                if (c->object.flags & SYMMETRIC_LEFT)
1803                        (*num_ours)++;
1804                else
1805                        (*num_theirs)++;
1806        }
1807
1808        /* clear object flags smudged by the above traversal */
1809        clear_commit_marks(ours, ALL_REV_FLAGS);
1810        clear_commit_marks(theirs, ALL_REV_FLAGS);
1811        return 1;
1812}
1813
1814/*
1815 * Return true when there is anything to report, otherwise false.
1816 */
1817int format_tracking_info(struct branch *branch, struct strbuf *sb)
1818{
1819        int ours, theirs;
1820        const char *base;
1821        int upstream_is_gone = 0;
1822
1823        switch (stat_tracking_info(branch, &ours, &theirs)) {
1824        case 0:
1825                /* no base */
1826                return 0;
1827        case -1:
1828                /* with "gone" base */
1829                upstream_is_gone = 1;
1830                break;
1831        default:
1832                /* with base */
1833                break;
1834        }
1835
1836        base = branch->merge[0]->dst;
1837        base = shorten_unambiguous_ref(base, 0);
1838        if (upstream_is_gone) {
1839                strbuf_addf(sb,
1840                        _("Your branch is based on '%s', but the upstream is gone.\n"),
1841                        base);
1842                if (advice_status_hints)
1843                        strbuf_addf(sb,
1844                                _("  (use \"git branch --unset-upstream\" to fixup)\n"));
1845        } else if (!ours && !theirs) {
1846                strbuf_addf(sb,
1847                        _("Your branch is up-to-date with '%s'.\n"),
1848                        base);
1849        } else if (!theirs) {
1850                strbuf_addf(sb,
1851                        Q_("Your branch is ahead of '%s' by %d commit.\n",
1852                           "Your branch is ahead of '%s' by %d commits.\n",
1853                           ours),
1854                        base, ours);
1855                if (advice_status_hints)
1856                        strbuf_addf(sb,
1857                                _("  (use \"git push\" to publish your local commits)\n"));
1858        } else if (!ours) {
1859                strbuf_addf(sb,
1860                        Q_("Your branch is behind '%s' by %d commit, "
1861                               "and can be fast-forwarded.\n",
1862                           "Your branch is behind '%s' by %d commits, "
1863                               "and can be fast-forwarded.\n",
1864                           theirs),
1865                        base, theirs);
1866                if (advice_status_hints)
1867                        strbuf_addf(sb,
1868                                _("  (use \"git pull\" to update your local branch)\n"));
1869        } else {
1870                strbuf_addf(sb,
1871                        Q_("Your branch and '%s' have diverged,\n"
1872                               "and have %d and %d different commit each, "
1873                               "respectively.\n",
1874                           "Your branch and '%s' have diverged,\n"
1875                               "and have %d and %d different commits each, "
1876                               "respectively.\n",
1877                           theirs),
1878                        base, ours, theirs);
1879                if (advice_status_hints)
1880                        strbuf_addf(sb,
1881                                _("  (use \"git pull\" to merge the remote branch into yours)\n"));
1882        }
1883        return 1;
1884}
1885
1886static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
1887{
1888        struct ref ***local_tail = cb_data;
1889        struct ref *ref;
1890        int len;
1891
1892        /* we already know it starts with refs/ to get here */
1893        if (check_refname_format(refname + 5, 0))
1894                return 0;
1895
1896        len = strlen(refname) + 1;
1897        ref = xcalloc(1, sizeof(*ref) + len);
1898        hashcpy(ref->new_sha1, sha1);
1899        memcpy(ref->name, refname, len);
1900        **local_tail = ref;
1901        *local_tail = &ref->next;
1902        return 0;
1903}
1904
1905struct ref *get_local_heads(void)
1906{
1907        struct ref *local_refs = NULL, **local_tail = &local_refs;
1908        for_each_ref(one_local_ref, &local_tail);
1909        return local_refs;
1910}
1911
1912struct ref *guess_remote_head(const struct ref *head,
1913                              const struct ref *refs,
1914                              int all)
1915{
1916        const struct ref *r;
1917        struct ref *list = NULL;
1918        struct ref **tail = &list;
1919
1920        if (!head)
1921                return NULL;
1922
1923        /*
1924         * Some transports support directly peeking at
1925         * where HEAD points; if that is the case, then
1926         * we don't have to guess.
1927         */
1928        if (head->symref)
1929                return copy_ref(find_ref_by_name(refs, head->symref));
1930
1931        /* If refs/heads/master could be right, it is. */
1932        if (!all) {
1933                r = find_ref_by_name(refs, "refs/heads/master");
1934                if (r && !hashcmp(r->old_sha1, head->old_sha1))
1935                        return copy_ref(r);
1936        }
1937
1938        /* Look for another ref that points there */
1939        for (r = refs; r; r = r->next) {
1940                if (r != head &&
1941                    !prefixcmp(r->name, "refs/heads/") &&
1942                    !hashcmp(r->old_sha1, head->old_sha1)) {
1943                        *tail = copy_ref(r);
1944                        tail = &((*tail)->next);
1945                        if (!all)
1946                                break;
1947                }
1948        }
1949
1950        return list;
1951}
1952
1953struct stale_heads_info {
1954        struct string_list *ref_names;
1955        struct ref **stale_refs_tail;
1956        struct refspec *refs;
1957        int ref_count;
1958};
1959
1960static int get_stale_heads_cb(const char *refname,
1961        const unsigned char *sha1, int flags, void *cb_data)
1962{
1963        struct stale_heads_info *info = cb_data;
1964        struct refspec query;
1965        memset(&query, 0, sizeof(struct refspec));
1966        query.dst = (char *)refname;
1967
1968        if (query_refspecs(info->refs, info->ref_count, &query))
1969                return 0; /* No matches */
1970
1971        /*
1972         * If we did find a suitable refspec and it's not a symref and
1973         * it's not in the list of refs that currently exist in that
1974         * remote we consider it to be stale.
1975         */
1976        if (!((flags & REF_ISSYMREF) ||
1977              string_list_has_string(info->ref_names, query.src))) {
1978                struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
1979                hashcpy(ref->new_sha1, sha1);
1980        }
1981
1982        free(query.src);
1983        return 0;
1984}
1985
1986struct ref *get_stale_heads(struct refspec *refs, int ref_count, struct ref *fetch_map)
1987{
1988        struct ref *ref, *stale_refs = NULL;
1989        struct string_list ref_names = STRING_LIST_INIT_NODUP;
1990        struct stale_heads_info info;
1991        info.ref_names = &ref_names;
1992        info.stale_refs_tail = &stale_refs;
1993        info.refs = refs;
1994        info.ref_count = ref_count;
1995        for (ref = fetch_map; ref; ref = ref->next)
1996                string_list_append(&ref_names, ref->name);
1997        sort_string_list(&ref_names);
1998        for_each_ref(get_stale_heads_cb, &info);
1999        string_list_clear(&ref_names, 0);
2000        return stale_refs;
2001}
2002
2003/*
2004 * Compare-and-swap
2005 */
2006void clear_cas_option(struct push_cas_option *cas)
2007{
2008        int i;
2009
2010        for (i = 0; i < cas->nr; i++)
2011                free(cas->entry[i].refname);
2012        free(cas->entry);
2013        memset(cas, 0, sizeof(*cas));
2014}
2015
2016static struct push_cas *add_cas_entry(struct push_cas_option *cas,
2017                                      const char *refname,
2018                                      size_t refnamelen)
2019{
2020        struct push_cas *entry;
2021        ALLOC_GROW(cas->entry, cas->nr + 1, cas->alloc);
2022        entry = &cas->entry[cas->nr++];
2023        memset(entry, 0, sizeof(*entry));
2024        entry->refname = xmemdupz(refname, refnamelen);
2025        return entry;
2026}
2027
2028int parse_push_cas_option(struct push_cas_option *cas, const char *arg, int unset)
2029{
2030        const char *colon;
2031        struct push_cas *entry;
2032
2033        if (unset) {
2034                /* "--no-<option>" */
2035                clear_cas_option(cas);
2036                return 0;
2037        }
2038
2039        if (!arg) {
2040                /* just "--<option>" */
2041                cas->use_tracking_for_rest = 1;
2042                return 0;
2043        }
2044
2045        /* "--<option>=refname" or "--<option>=refname:value" */
2046        colon = strchrnul(arg, ':');
2047        entry = add_cas_entry(cas, arg, colon - arg);
2048        if (!*colon)
2049                entry->use_tracking = 1;
2050        else if (get_sha1(colon + 1, entry->expect))
2051                return error("cannot parse expected object name '%s'", colon + 1);
2052        return 0;
2053}
2054
2055int parseopt_push_cas_option(const struct option *opt, const char *arg, int unset)
2056{
2057        return parse_push_cas_option(opt->value, arg, unset);
2058}
2059
2060int is_empty_cas(const struct push_cas_option *cas)
2061{
2062        return !cas->use_tracking_for_rest && !cas->nr;
2063}
2064
2065/*
2066 * Look at remote.fetch refspec and see if we have a remote
2067 * tracking branch for the refname there.  Fill its current
2068 * value in sha1[].
2069 * If we cannot do so, return negative to signal an error.
2070 */
2071static int remote_tracking(struct remote *remote, const char *refname,
2072                           unsigned char sha1[20])
2073{
2074        char *dst;
2075
2076        dst = apply_refspecs(remote->fetch, remote->fetch_refspec_nr, refname);
2077        if (!dst)
2078                return -1; /* no tracking ref for refname at remote */
2079        if (read_ref(dst, sha1))
2080                return -1; /* we know what the tracking ref is but we cannot read it */
2081        return 0;
2082}
2083
2084static void apply_cas(struct push_cas_option *cas,
2085                      struct remote *remote,
2086                      struct ref *ref)
2087{
2088        int i;
2089
2090        /* Find an explicit --<option>=<name>[:<value>] entry */
2091        for (i = 0; i < cas->nr; i++) {
2092                struct push_cas *entry = &cas->entry[i];
2093                if (!refname_match(entry->refname, ref->name, ref_rev_parse_rules))
2094                        continue;
2095                ref->expect_old_sha1 = 1;
2096                if (!entry->use_tracking)
2097                        hashcpy(ref->old_sha1_expect, cas->entry[i].expect);
2098                else if (remote_tracking(remote, ref->name, ref->old_sha1_expect))
2099                        ref->expect_old_no_trackback = 1;
2100                return;
2101        }
2102
2103        /* Are we using "--<option>" to cover all? */
2104        if (!cas->use_tracking_for_rest)
2105                return;
2106
2107        ref->expect_old_sha1 = 1;
2108        if (remote_tracking(remote, ref->name, ref->old_sha1_expect))
2109                ref->expect_old_no_trackback = 1;
2110}
2111
2112void apply_push_cas(struct push_cas_option *cas,
2113                    struct remote *remote,
2114                    struct ref *remote_refs)
2115{
2116        struct ref *ref;
2117        for (ref = remote_refs; ref; ref = ref->next)
2118                apply_cas(cas, remote, ref);
2119}