Andrew's git / gitweb.git / remote.c
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remote.con commit handle_duplicate(): mark error message for translation (76ea671)
   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
 748static void handle_duplicate(struct ref *ref1, struct ref *ref2)
 749{
 750        if (strcmp(ref1->name, ref2->name))
 751                die(_("%s tracks both %s and %s"),
 752                    ref2->peer_ref->name, ref1->name, ref2->name);
 753        free(ref2->peer_ref);
 754        free(ref2);
 755}
 756
 757struct ref *ref_remove_duplicates(struct ref *ref_map)
 758{
 759        struct string_list refs = STRING_LIST_INIT_NODUP;
 760        struct ref *retval = NULL;
 761        struct ref **p = &retval;
 762
 763        while (ref_map) {
 764                struct ref *ref = ref_map;
 765
 766                ref_map = ref_map->next;
 767                ref->next = NULL;
 768
 769                if (!ref->peer_ref) {
 770                        *p = ref;
 771                        p = &ref->next;
 772                } else {
 773                        struct string_list_item *item =
 774                                string_list_insert(&refs, ref->peer_ref->name);
 775
 776                        if (item->util) {
 777                                /* Entry already existed */
 778                                handle_duplicate((struct ref *)item->util, ref);
 779                        } else {
 780                                *p = ref;
 781                                p = &ref->next;
 782                                item->util = ref;
 783                        }
 784                }
 785        }
 786
 787        string_list_clear(&refs, 0);
 788        return retval;
 789}
 790
 791int remote_has_url(struct remote *remote, const char *url)
 792{
 793        int i;
 794        for (i = 0; i < remote->url_nr; i++) {
 795                if (!strcmp(remote->url[i], url))
 796                        return 1;
 797        }
 798        return 0;
 799}
 800
 801static int match_name_with_pattern(const char *key, const char *name,
 802                                   const char *value, char **result)
 803{
 804        const char *kstar = strchr(key, '*');
 805        size_t klen;
 806        size_t ksuffixlen;
 807        size_t namelen;
 808        int ret;
 809        if (!kstar)
 810                die("Key '%s' of pattern had no '*'", key);
 811        klen = kstar - key;
 812        ksuffixlen = strlen(kstar + 1);
 813        namelen = strlen(name);
 814        ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
 815                !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
 816        if (ret && value) {
 817                const char *vstar = strchr(value, '*');
 818                size_t vlen;
 819                size_t vsuffixlen;
 820                if (!vstar)
 821                        die("Value '%s' of pattern has no '*'", value);
 822                vlen = vstar - value;
 823                vsuffixlen = strlen(vstar + 1);
 824                *result = xmalloc(vlen + vsuffixlen +
 825                                  strlen(name) -
 826                                  klen - ksuffixlen + 1);
 827                strncpy(*result, value, vlen);
 828                strncpy(*result + vlen,
 829                        name + klen, namelen - klen - ksuffixlen);
 830                strcpy(*result + vlen + namelen - klen - ksuffixlen,
 831                       vstar + 1);
 832        }
 833        return ret;
 834}
 835
 836static int query_refspecs(struct refspec *refs, int ref_count, struct refspec *query)
 837{
 838        int i;
 839        int find_src = !query->src;
 840        const char *needle = find_src ? query->dst : query->src;
 841        char **result = find_src ? &query->src : &query->dst;
 842
 843        if (find_src && !query->dst)
 844                return error("query_refspecs: need either src or dst");
 845
 846        for (i = 0; i < ref_count; i++) {
 847                struct refspec *refspec = &refs[i];
 848                const char *key = find_src ? refspec->dst : refspec->src;
 849                const char *value = find_src ? refspec->src : refspec->dst;
 850
 851                if (!refspec->dst)
 852                        continue;
 853                if (refspec->pattern) {
 854                        if (match_name_with_pattern(key, needle, value, result)) {
 855                                query->force = refspec->force;
 856                                return 0;
 857                        }
 858                } else if (!strcmp(needle, key)) {
 859                        *result = xstrdup(value);
 860                        query->force = refspec->force;
 861                        return 0;
 862                }
 863        }
 864        return -1;
 865}
 866
 867char *apply_refspecs(struct refspec *refspecs, int nr_refspec,
 868                     const char *name)
 869{
 870        struct refspec query;
 871
 872        memset(&query, 0, sizeof(struct refspec));
 873        query.src = (char *)name;
 874
 875        if (query_refspecs(refspecs, nr_refspec, &query))
 876                return NULL;
 877
 878        return query.dst;
 879}
 880
 881int remote_find_tracking(struct remote *remote, struct refspec *refspec)
 882{
 883        return query_refspecs(remote->fetch, remote->fetch_refspec_nr, refspec);
 884}
 885
 886static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
 887                const char *name)
 888{
 889        size_t len = strlen(name);
 890        struct ref *ref = xcalloc(1, sizeof(struct ref) + prefixlen + len + 1);
 891        memcpy(ref->name, prefix, prefixlen);
 892        memcpy(ref->name + prefixlen, name, len);
 893        return ref;
 894}
 895
 896struct ref *alloc_ref(const char *name)
 897{
 898        return alloc_ref_with_prefix("", 0, name);
 899}
 900
 901struct ref *copy_ref(const struct ref *ref)
 902{
 903        struct ref *cpy;
 904        size_t len;
 905        if (!ref)
 906                return NULL;
 907        len = strlen(ref->name);
 908        cpy = xmalloc(sizeof(struct ref) + len + 1);
 909        memcpy(cpy, ref, sizeof(struct ref) + len + 1);
 910        cpy->next = NULL;
 911        cpy->symref = ref->symref ? xstrdup(ref->symref) : NULL;
 912        cpy->remote_status = ref->remote_status ? xstrdup(ref->remote_status) : NULL;
 913        cpy->peer_ref = copy_ref(ref->peer_ref);
 914        return cpy;
 915}
 916
 917struct ref *copy_ref_list(const struct ref *ref)
 918{
 919        struct ref *ret = NULL;
 920        struct ref **tail = &ret;
 921        while (ref) {
 922                *tail = copy_ref(ref);
 923                ref = ref->next;
 924                tail = &((*tail)->next);
 925        }
 926        return ret;
 927}
 928
 929static void free_ref(struct ref *ref)
 930{
 931        if (!ref)
 932                return;
 933        free_ref(ref->peer_ref);
 934        free(ref->remote_status);
 935        free(ref->symref);
 936        free(ref);
 937}
 938
 939void free_refs(struct ref *ref)
 940{
 941        struct ref *next;
 942        while (ref) {
 943                next = ref->next;
 944                free_ref(ref);
 945                ref = next;
 946        }
 947}
 948
 949int ref_compare_name(const void *va, const void *vb)
 950{
 951        const struct ref *a = va, *b = vb;
 952        return strcmp(a->name, b->name);
 953}
 954
 955static void *ref_list_get_next(const void *a)
 956{
 957        return ((const struct ref *)a)->next;
 958}
 959
 960static void ref_list_set_next(void *a, void *next)
 961{
 962        ((struct ref *)a)->next = next;
 963}
 964
 965void sort_ref_list(struct ref **l, int (*cmp)(const void *, const void *))
 966{
 967        *l = llist_mergesort(*l, ref_list_get_next, ref_list_set_next, cmp);
 968}
 969
 970static int count_refspec_match(const char *pattern,
 971                               struct ref *refs,
 972                               struct ref **matched_ref)
 973{
 974        int patlen = strlen(pattern);
 975        struct ref *matched_weak = NULL;
 976        struct ref *matched = NULL;
 977        int weak_match = 0;
 978        int match = 0;
 979
 980        for (weak_match = match = 0; refs; refs = refs->next) {
 981                char *name = refs->name;
 982                int namelen = strlen(name);
 983
 984                if (!refname_match(pattern, name, ref_rev_parse_rules))
 985                        continue;
 986
 987                /* A match is "weak" if it is with refs outside
 988                 * heads or tags, and did not specify the pattern
 989                 * in full (e.g. "refs/remotes/origin/master") or at
 990                 * least from the toplevel (e.g. "remotes/origin/master");
 991                 * otherwise "git push $URL master" would result in
 992                 * ambiguity between remotes/origin/master and heads/master
 993                 * at the remote site.
 994                 */
 995                if (namelen != patlen &&
 996                    patlen != namelen - 5 &&
 997                    prefixcmp(name, "refs/heads/") &&
 998                    prefixcmp(name, "refs/tags/")) {
 999                        /* We want to catch the case where only weak
1000                         * matches are found and there are multiple
1001                         * matches, and where more than one strong
1002                         * matches are found, as ambiguous.  One
1003                         * strong match with zero or more weak matches
1004                         * are acceptable as a unique match.
1005                         */
1006                        matched_weak = refs;
1007                        weak_match++;
1008                }
1009                else {
1010                        matched = refs;
1011                        match++;
1012                }
1013        }
1014        if (!matched) {
1015                *matched_ref = matched_weak;
1016                return weak_match;
1017        }
1018        else {
1019                *matched_ref = matched;
1020                return match;
1021        }
1022}
1023
1024static void tail_link_ref(struct ref *ref, struct ref ***tail)
1025{
1026        **tail = ref;
1027        while (ref->next)
1028                ref = ref->next;
1029        *tail = &ref->next;
1030}
1031
1032static struct ref *alloc_delete_ref(void)
1033{
1034        struct ref *ref = alloc_ref("(delete)");
1035        hashclr(ref->new_sha1);
1036        return ref;
1037}
1038
1039static struct ref *try_explicit_object_name(const char *name)
1040{
1041        unsigned char sha1[20];
1042        struct ref *ref;
1043
1044        if (!*name)
1045                return alloc_delete_ref();
1046        if (get_sha1(name, sha1))
1047                return NULL;
1048        ref = alloc_ref(name);
1049        hashcpy(ref->new_sha1, sha1);
1050        return ref;
1051}
1052
1053static struct ref *make_linked_ref(const char *name, struct ref ***tail)
1054{
1055        struct ref *ret = alloc_ref(name);
1056        tail_link_ref(ret, tail);
1057        return ret;
1058}
1059
1060static char *guess_ref(const char *name, struct ref *peer)
1061{
1062        struct strbuf buf = STRBUF_INIT;
1063        unsigned char sha1[20];
1064
1065        const char *r = resolve_ref_unsafe(peer->name, sha1, 1, NULL);
1066        if (!r)
1067                return NULL;
1068
1069        if (!prefixcmp(r, "refs/heads/"))
1070                strbuf_addstr(&buf, "refs/heads/");
1071        else if (!prefixcmp(r, "refs/tags/"))
1072                strbuf_addstr(&buf, "refs/tags/");
1073        else
1074                return NULL;
1075
1076        strbuf_addstr(&buf, name);
1077        return strbuf_detach(&buf, NULL);
1078}
1079
1080static int match_explicit(struct ref *src, struct ref *dst,
1081                          struct ref ***dst_tail,
1082                          struct refspec *rs)
1083{
1084        struct ref *matched_src, *matched_dst;
1085        int copy_src;
1086
1087        const char *dst_value = rs->dst;
1088        char *dst_guess;
1089
1090        if (rs->pattern || rs->matching)
1091                return 0;
1092
1093        matched_src = matched_dst = NULL;
1094        switch (count_refspec_match(rs->src, src, &matched_src)) {
1095        case 1:
1096                copy_src = 1;
1097                break;
1098        case 0:
1099                /* The source could be in the get_sha1() format
1100                 * not a reference name.  :refs/other is a
1101                 * way to delete 'other' ref at the remote end.
1102                 */
1103                matched_src = try_explicit_object_name(rs->src);
1104                if (!matched_src)
1105                        return error("src refspec %s does not match any.", rs->src);
1106                copy_src = 0;
1107                break;
1108        default:
1109                return error("src refspec %s matches more than one.", rs->src);
1110        }
1111
1112        if (!dst_value) {
1113                unsigned char sha1[20];
1114                int flag;
1115
1116                dst_value = resolve_ref_unsafe(matched_src->name, sha1, 1, &flag);
1117                if (!dst_value ||
1118                    ((flag & REF_ISSYMREF) &&
1119                     prefixcmp(dst_value, "refs/heads/")))
1120                        die("%s cannot be resolved to branch.",
1121                            matched_src->name);
1122        }
1123
1124        switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1125        case 1:
1126                break;
1127        case 0:
1128                if (!memcmp(dst_value, "refs/", 5))
1129                        matched_dst = make_linked_ref(dst_value, dst_tail);
1130                else if (is_null_sha1(matched_src->new_sha1))
1131                        error("unable to delete '%s': remote ref does not exist",
1132                              dst_value);
1133                else if ((dst_guess = guess_ref(dst_value, matched_src)))
1134                        matched_dst = make_linked_ref(dst_guess, dst_tail);
1135                else
1136                        error("unable to push to unqualified destination: %s\n"
1137                              "The destination refspec neither matches an "
1138                              "existing ref on the remote nor\n"
1139                              "begins with refs/, and we are unable to "
1140                              "guess a prefix based on the source ref.",
1141                              dst_value);
1142                break;
1143        default:
1144                matched_dst = NULL;
1145                error("dst refspec %s matches more than one.",
1146                      dst_value);
1147                break;
1148        }
1149        if (!matched_dst)
1150                return -1;
1151        if (matched_dst->peer_ref)
1152                return error("dst ref %s receives from more than one src.",
1153                      matched_dst->name);
1154        else {
1155                matched_dst->peer_ref = copy_src ? copy_ref(matched_src) : matched_src;
1156                matched_dst->force = rs->force;
1157        }
1158        return 0;
1159}
1160
1161static int match_explicit_refs(struct ref *src, struct ref *dst,
1162                               struct ref ***dst_tail, struct refspec *rs,
1163                               int rs_nr)
1164{
1165        int i, errs;
1166        for (i = errs = 0; i < rs_nr; i++)
1167                errs += match_explicit(src, dst, dst_tail, &rs[i]);
1168        return errs;
1169}
1170
1171static char *get_ref_match(const struct refspec *rs, int rs_nr, const struct ref *ref,
1172                int send_mirror, int direction, const struct refspec **ret_pat)
1173{
1174        const struct refspec *pat;
1175        char *name;
1176        int i;
1177        int matching_refs = -1;
1178        for (i = 0; i < rs_nr; i++) {
1179                if (rs[i].matching &&
1180                    (matching_refs == -1 || rs[i].force)) {
1181                        matching_refs = i;
1182                        continue;
1183                }
1184
1185                if (rs[i].pattern) {
1186                        const char *dst_side = rs[i].dst ? rs[i].dst : rs[i].src;
1187                        int match;
1188                        if (direction == FROM_SRC)
1189                                match = match_name_with_pattern(rs[i].src, ref->name, dst_side, &name);
1190                        else
1191                                match = match_name_with_pattern(dst_side, ref->name, rs[i].src, &name);
1192                        if (match) {
1193                                matching_refs = i;
1194                                break;
1195                        }
1196                }
1197        }
1198        if (matching_refs == -1)
1199                return NULL;
1200
1201        pat = rs + matching_refs;
1202        if (pat->matching) {
1203                /*
1204                 * "matching refs"; traditionally we pushed everything
1205                 * including refs outside refs/heads/ hierarchy, but
1206                 * that does not make much sense these days.
1207                 */
1208                if (!send_mirror && prefixcmp(ref->name, "refs/heads/"))
1209                        return NULL;
1210                name = xstrdup(ref->name);
1211        }
1212        if (ret_pat)
1213                *ret_pat = pat;
1214        return name;
1215}
1216
1217static struct ref **tail_ref(struct ref **head)
1218{
1219        struct ref **tail = head;
1220        while (*tail)
1221                tail = &((*tail)->next);
1222        return tail;
1223}
1224
1225struct tips {
1226        struct commit **tip;
1227        int nr, alloc;
1228};
1229
1230static void add_to_tips(struct tips *tips, const unsigned char *sha1)
1231{
1232        struct commit *commit;
1233
1234        if (is_null_sha1(sha1))
1235                return;
1236        commit = lookup_commit_reference_gently(sha1, 1);
1237        if (!commit || (commit->object.flags & TMP_MARK))
1238                return;
1239        commit->object.flags |= TMP_MARK;
1240        ALLOC_GROW(tips->tip, tips->nr + 1, tips->alloc);
1241        tips->tip[tips->nr++] = commit;
1242}
1243
1244static void add_missing_tags(struct ref *src, struct ref **dst, struct ref ***dst_tail)
1245{
1246        struct string_list dst_tag = STRING_LIST_INIT_NODUP;
1247        struct string_list src_tag = STRING_LIST_INIT_NODUP;
1248        struct string_list_item *item;
1249        struct ref *ref;
1250        struct tips sent_tips;
1251
1252        /*
1253         * Collect everything we know they would have at the end of
1254         * this push, and collect all tags they have.
1255         */
1256        memset(&sent_tips, 0, sizeof(sent_tips));
1257        for (ref = *dst; ref; ref = ref->next) {
1258                if (ref->peer_ref &&
1259                    !is_null_sha1(ref->peer_ref->new_sha1))
1260                        add_to_tips(&sent_tips, ref->peer_ref->new_sha1);
1261                else
1262                        add_to_tips(&sent_tips, ref->old_sha1);
1263                if (!prefixcmp(ref->name, "refs/tags/"))
1264                        string_list_append(&dst_tag, ref->name);
1265        }
1266        clear_commit_marks_many(sent_tips.nr, sent_tips.tip, TMP_MARK);
1267
1268        sort_string_list(&dst_tag);
1269
1270        /* Collect tags they do not have. */
1271        for (ref = src; ref; ref = ref->next) {
1272                if (prefixcmp(ref->name, "refs/tags/"))
1273                        continue; /* not a tag */
1274                if (string_list_has_string(&dst_tag, ref->name))
1275                        continue; /* they already have it */
1276                if (sha1_object_info(ref->new_sha1, NULL) != OBJ_TAG)
1277                        continue; /* be conservative */
1278                item = string_list_append(&src_tag, ref->name);
1279                item->util = ref;
1280        }
1281        string_list_clear(&dst_tag, 0);
1282
1283        /*
1284         * At this point, src_tag lists tags that are missing from
1285         * dst, and sent_tips lists the tips we are pushing or those
1286         * that we know they already have. An element in the src_tag
1287         * that is an ancestor of any of the sent_tips needs to be
1288         * sent to the other side.
1289         */
1290        if (sent_tips.nr) {
1291                for_each_string_list_item(item, &src_tag) {
1292                        struct ref *ref = item->util;
1293                        struct ref *dst_ref;
1294                        struct commit *commit;
1295
1296                        if (is_null_sha1(ref->new_sha1))
1297                                continue;
1298                        commit = lookup_commit_reference_gently(ref->new_sha1, 1);
1299                        if (!commit)
1300                                /* not pushing a commit, which is not an error */
1301                                continue;
1302
1303                        /*
1304                         * Is this tag, which they do not have, reachable from
1305                         * any of the commits we are sending?
1306                         */
1307                        if (!in_merge_bases_many(commit, sent_tips.nr, sent_tips.tip))
1308                                continue;
1309
1310                        /* Add it in */
1311                        dst_ref = make_linked_ref(ref->name, dst_tail);
1312                        hashcpy(dst_ref->new_sha1, ref->new_sha1);
1313                        dst_ref->peer_ref = copy_ref(ref);
1314                }
1315        }
1316        string_list_clear(&src_tag, 0);
1317        free(sent_tips.tip);
1318}
1319
1320struct ref *find_ref_by_name(const struct ref *list, const char *name)
1321{
1322        for ( ; list; list = list->next)
1323                if (!strcmp(list->name, name))
1324                        return (struct ref *)list;
1325        return NULL;
1326}
1327
1328static void prepare_ref_index(struct string_list *ref_index, struct ref *ref)
1329{
1330        for ( ; ref; ref = ref->next)
1331                string_list_append_nodup(ref_index, ref->name)->util = ref;
1332
1333        sort_string_list(ref_index);
1334}
1335
1336/*
1337 * Given the set of refs the local repository has, the set of refs the
1338 * remote repository has, and the refspec used for push, determine
1339 * what remote refs we will update and with what value by setting
1340 * peer_ref (which object is being pushed) and force (if the push is
1341 * forced) in elements of "dst". The function may add new elements to
1342 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
1343 */
1344int match_push_refs(struct ref *src, struct ref **dst,
1345                    int nr_refspec, const char **refspec, int flags)
1346{
1347        struct refspec *rs;
1348        int send_all = flags & MATCH_REFS_ALL;
1349        int send_mirror = flags & MATCH_REFS_MIRROR;
1350        int send_prune = flags & MATCH_REFS_PRUNE;
1351        int errs;
1352        static const char *default_refspec[] = { ":", NULL };
1353        struct ref *ref, **dst_tail = tail_ref(dst);
1354        struct string_list dst_ref_index = STRING_LIST_INIT_NODUP;
1355
1356        if (!nr_refspec) {
1357                nr_refspec = 1;
1358                refspec = default_refspec;
1359        }
1360        rs = parse_push_refspec(nr_refspec, (const char **) refspec);
1361        errs = match_explicit_refs(src, *dst, &dst_tail, rs, nr_refspec);
1362
1363        /* pick the remainder */
1364        for (ref = src; ref; ref = ref->next) {
1365                struct string_list_item *dst_item;
1366                struct ref *dst_peer;
1367                const struct refspec *pat = NULL;
1368                char *dst_name;
1369
1370                dst_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_SRC, &pat);
1371                if (!dst_name)
1372                        continue;
1373
1374                if (!dst_ref_index.nr)
1375                        prepare_ref_index(&dst_ref_index, *dst);
1376
1377                dst_item = string_list_lookup(&dst_ref_index, dst_name);
1378                dst_peer = dst_item ? dst_item->util : NULL;
1379                if (dst_peer) {
1380                        if (dst_peer->peer_ref)
1381                                /* We're already sending something to this ref. */
1382                                goto free_name;
1383                } else {
1384                        if (pat->matching && !(send_all || send_mirror))
1385                                /*
1386                                 * Remote doesn't have it, and we have no
1387                                 * explicit pattern, and we don't have
1388                                 * --all nor --mirror.
1389                                 */
1390                                goto free_name;
1391
1392                        /* Create a new one and link it */
1393                        dst_peer = make_linked_ref(dst_name, &dst_tail);
1394                        hashcpy(dst_peer->new_sha1, ref->new_sha1);
1395                        string_list_insert(&dst_ref_index,
1396                                dst_peer->name)->util = dst_peer;
1397                }
1398                dst_peer->peer_ref = copy_ref(ref);
1399                dst_peer->force = pat->force;
1400        free_name:
1401                free(dst_name);
1402        }
1403
1404        string_list_clear(&dst_ref_index, 0);
1405
1406        if (flags & MATCH_REFS_FOLLOW_TAGS)
1407                add_missing_tags(src, dst, &dst_tail);
1408
1409        if (send_prune) {
1410                struct string_list src_ref_index = STRING_LIST_INIT_NODUP;
1411                /* check for missing refs on the remote */
1412                for (ref = *dst; ref; ref = ref->next) {
1413                        char *src_name;
1414
1415                        if (ref->peer_ref)
1416                                /* We're already sending something to this ref. */
1417                                continue;
1418
1419                        src_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_DST, NULL);
1420                        if (src_name) {
1421                                if (!src_ref_index.nr)
1422                                        prepare_ref_index(&src_ref_index, src);
1423                                if (!string_list_has_string(&src_ref_index,
1424                                            src_name))
1425                                        ref->peer_ref = alloc_delete_ref();
1426                                free(src_name);
1427                        }
1428                }
1429                string_list_clear(&src_ref_index, 0);
1430        }
1431        if (errs)
1432                return -1;
1433        return 0;
1434}
1435
1436void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1437                             int force_update)
1438{
1439        struct ref *ref;
1440
1441        for (ref = remote_refs; ref; ref = ref->next) {
1442                int force_ref_update = ref->force || force_update;
1443                int reject_reason = 0;
1444
1445                if (ref->peer_ref)
1446                        hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
1447                else if (!send_mirror)
1448                        continue;
1449
1450                ref->deletion = is_null_sha1(ref->new_sha1);
1451                if (!ref->deletion &&
1452                        !hashcmp(ref->old_sha1, ref->new_sha1)) {
1453                        ref->status = REF_STATUS_UPTODATE;
1454                        continue;
1455                }
1456
1457                /*
1458                 * Bypass the usual "must fast-forward" check but
1459                 * replace it with a weaker "the old value must be
1460                 * this value we observed".  If the remote ref has
1461                 * moved and is now different from what we expect,
1462                 * reject any push.
1463                 *
1464                 * It also is an error if the user told us to check
1465                 * with the remote-tracking branch to find the value
1466                 * to expect, but we did not have such a tracking
1467                 * branch.
1468                 */
1469                if (ref->expect_old_sha1) {
1470                        if (ref->expect_old_no_trackback ||
1471                            hashcmp(ref->old_sha1, ref->old_sha1_expect))
1472                                reject_reason = REF_STATUS_REJECT_STALE;
1473                }
1474
1475                /*
1476                 * The usual "must fast-forward" rules.
1477                 *
1478                 * Decide whether an individual refspec A:B can be
1479                 * pushed.  The push will succeed if any of the
1480                 * following are true:
1481                 *
1482                 * (1) the remote reference B does not exist
1483                 *
1484                 * (2) the remote reference B is being removed (i.e.,
1485                 *     pushing :B where no source is specified)
1486                 *
1487                 * (3) the destination is not under refs/tags/, and
1488                 *     if the old and new value is a commit, the new
1489                 *     is a descendant of the old.
1490                 *
1491                 * (4) it is forced using the +A:B notation, or by
1492                 *     passing the --force argument
1493                 */
1494
1495                else if (!ref->deletion && !is_null_sha1(ref->old_sha1)) {
1496                        if (!prefixcmp(ref->name, "refs/tags/"))
1497                                reject_reason = REF_STATUS_REJECT_ALREADY_EXISTS;
1498                        else if (!has_sha1_file(ref->old_sha1))
1499                                reject_reason = REF_STATUS_REJECT_FETCH_FIRST;
1500                        else if (!lookup_commit_reference_gently(ref->old_sha1, 1) ||
1501                                 !lookup_commit_reference_gently(ref->new_sha1, 1))
1502                                reject_reason = REF_STATUS_REJECT_NEEDS_FORCE;
1503                        else if (!ref_newer(ref->new_sha1, ref->old_sha1))
1504                                reject_reason = REF_STATUS_REJECT_NONFASTFORWARD;
1505                }
1506
1507                /*
1508                 * "--force" will defeat any rejection implemented
1509                 * by the rules above.
1510                 */
1511                if (!force_ref_update)
1512                        ref->status = reject_reason;
1513                else if (reject_reason)
1514                        ref->forced_update = 1;
1515        }
1516}
1517
1518struct branch *branch_get(const char *name)
1519{
1520        struct branch *ret;
1521
1522        read_config();
1523        if (!name || !*name || !strcmp(name, "HEAD"))
1524                ret = current_branch;
1525        else
1526                ret = make_branch(name, 0);
1527        if (ret && ret->remote_name) {
1528                ret->remote = remote_get(ret->remote_name);
1529                if (ret->merge_nr) {
1530                        int i;
1531                        ret->merge = xcalloc(ret->merge_nr, sizeof(*ret->merge));
1532                        for (i = 0; i < ret->merge_nr; i++) {
1533                                ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1534                                ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1535                                if (remote_find_tracking(ret->remote, ret->merge[i])
1536                                    && !strcmp(ret->remote_name, "."))
1537                                        ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1538                        }
1539                }
1540        }
1541        return ret;
1542}
1543
1544int branch_has_merge_config(struct branch *branch)
1545{
1546        return branch && !!branch->merge;
1547}
1548
1549int branch_merge_matches(struct branch *branch,
1550                                 int i,
1551                                 const char *refname)
1552{
1553        if (!branch || i < 0 || i >= branch->merge_nr)
1554                return 0;
1555        return refname_match(branch->merge[i]->src, refname, ref_fetch_rules);
1556}
1557
1558static int ignore_symref_update(const char *refname)
1559{
1560        unsigned char sha1[20];
1561        int flag;
1562
1563        if (!resolve_ref_unsafe(refname, sha1, 0, &flag))
1564                return 0; /* non-existing refs are OK */
1565        return (flag & REF_ISSYMREF);
1566}
1567
1568/*
1569 * Create and return a list of (struct ref) consisting of copies of
1570 * each remote_ref that matches refspec.  refspec must be a pattern.
1571 * Fill in the copies' peer_ref to describe the local tracking refs to
1572 * which they map.  Omit any references that would map to an existing
1573 * local symbolic ref.
1574 */
1575static struct ref *get_expanded_map(const struct ref *remote_refs,
1576                                    const struct refspec *refspec)
1577{
1578        const struct ref *ref;
1579        struct ref *ret = NULL;
1580        struct ref **tail = &ret;
1581
1582        for (ref = remote_refs; ref; ref = ref->next) {
1583                char *expn_name = NULL;
1584
1585                if (strchr(ref->name, '^'))
1586                        continue; /* a dereference item */
1587                if (match_name_with_pattern(refspec->src, ref->name,
1588                                            refspec->dst, &expn_name) &&
1589                    !ignore_symref_update(expn_name)) {
1590                        struct ref *cpy = copy_ref(ref);
1591
1592                        cpy->peer_ref = alloc_ref(expn_name);
1593                        if (refspec->force)
1594                                cpy->peer_ref->force = 1;
1595                        *tail = cpy;
1596                        tail = &cpy->next;
1597                }
1598                free(expn_name);
1599        }
1600
1601        return ret;
1602}
1603
1604static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1605{
1606        const struct ref *ref;
1607        for (ref = refs; ref; ref = ref->next) {
1608                if (refname_match(name, ref->name, ref_fetch_rules))
1609                        return ref;
1610        }
1611        return NULL;
1612}
1613
1614struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1615{
1616        const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1617
1618        if (!ref)
1619                return NULL;
1620
1621        return copy_ref(ref);
1622}
1623
1624static struct ref *get_local_ref(const char *name)
1625{
1626        if (!name || name[0] == '\0')
1627                return NULL;
1628
1629        if (!prefixcmp(name, "refs/"))
1630                return alloc_ref(name);
1631
1632        if (!prefixcmp(name, "heads/") ||
1633            !prefixcmp(name, "tags/") ||
1634            !prefixcmp(name, "remotes/"))
1635                return alloc_ref_with_prefix("refs/", 5, name);
1636
1637        return alloc_ref_with_prefix("refs/heads/", 11, name);
1638}
1639
1640int get_fetch_map(const struct ref *remote_refs,
1641                  const struct refspec *refspec,
1642                  struct ref ***tail,
1643                  int missing_ok)
1644{
1645        struct ref *ref_map, **rmp;
1646
1647        if (refspec->pattern) {
1648                ref_map = get_expanded_map(remote_refs, refspec);
1649        } else {
1650                const char *name = refspec->src[0] ? refspec->src : "HEAD";
1651
1652                if (refspec->exact_sha1) {
1653                        ref_map = alloc_ref(name);
1654                        get_sha1_hex(name, ref_map->old_sha1);
1655                } else {
1656                        ref_map = get_remote_ref(remote_refs, name);
1657                }
1658                if (!missing_ok && !ref_map)
1659                        die("Couldn't find remote ref %s", name);
1660                if (ref_map) {
1661                        ref_map->peer_ref = get_local_ref(refspec->dst);
1662                        if (ref_map->peer_ref && refspec->force)
1663                                ref_map->peer_ref->force = 1;
1664                }
1665        }
1666
1667        for (rmp = &ref_map; *rmp; ) {
1668                if ((*rmp)->peer_ref) {
1669                        if (prefixcmp((*rmp)->peer_ref->name, "refs/") ||
1670                            check_refname_format((*rmp)->peer_ref->name, 0)) {
1671                                struct ref *ignore = *rmp;
1672                                error("* Ignoring funny ref '%s' locally",
1673                                      (*rmp)->peer_ref->name);
1674                                *rmp = (*rmp)->next;
1675                                free(ignore->peer_ref);
1676                                free(ignore);
1677                                continue;
1678                        }
1679                }
1680                rmp = &((*rmp)->next);
1681        }
1682
1683        if (ref_map)
1684                tail_link_ref(ref_map, tail);
1685
1686        return 0;
1687}
1688
1689int resolve_remote_symref(struct ref *ref, struct ref *list)
1690{
1691        if (!ref->symref)
1692                return 0;
1693        for (; list; list = list->next)
1694                if (!strcmp(ref->symref, list->name)) {
1695                        hashcpy(ref->old_sha1, list->old_sha1);
1696                        return 0;
1697                }
1698        return 1;
1699}
1700
1701static void unmark_and_free(struct commit_list *list, unsigned int mark)
1702{
1703        while (list) {
1704                struct commit_list *temp = list;
1705                temp->item->object.flags &= ~mark;
1706                list = temp->next;
1707                free(temp);
1708        }
1709}
1710
1711int ref_newer(const unsigned char *new_sha1, const unsigned char *old_sha1)
1712{
1713        struct object *o;
1714        struct commit *old, *new;
1715        struct commit_list *list, *used;
1716        int found = 0;
1717
1718        /*
1719         * Both new and old must be commit-ish and new is descendant of
1720         * old.  Otherwise we require --force.
1721         */
1722        o = deref_tag(parse_object(old_sha1), NULL, 0);
1723        if (!o || o->type != OBJ_COMMIT)
1724                return 0;
1725        old = (struct commit *) o;
1726
1727        o = deref_tag(parse_object(new_sha1), NULL, 0);
1728        if (!o || o->type != OBJ_COMMIT)
1729                return 0;
1730        new = (struct commit *) o;
1731
1732        if (parse_commit(new) < 0)
1733                return 0;
1734
1735        used = list = NULL;
1736        commit_list_insert(new, &list);
1737        while (list) {
1738                new = pop_most_recent_commit(&list, TMP_MARK);
1739                commit_list_insert(new, &used);
1740                if (new == old) {
1741                        found = 1;
1742                        break;
1743                }
1744        }
1745        unmark_and_free(list, TMP_MARK);
1746        unmark_and_free(used, TMP_MARK);
1747        return found;
1748}
1749
1750/*
1751 * Compare a branch with its upstream, and save their differences (number
1752 * of commits) in *num_ours and *num_theirs.
1753 *
1754 * Return 0 if branch has no upstream (no base), -1 if upstream is missing
1755 * (with "gone" base), otherwise 1 (with base).
1756 */
1757int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs)
1758{
1759        unsigned char sha1[20];
1760        struct commit *ours, *theirs;
1761        char symmetric[84];
1762        struct rev_info revs;
1763        const char *rev_argv[10], *base;
1764        int rev_argc;
1765
1766        /* Cannot stat unless we are marked to build on top of somebody else. */
1767        if (!branch ||
1768            !branch->merge || !branch->merge[0] || !branch->merge[0]->dst)
1769                return 0;
1770
1771        /* Cannot stat if what we used to build on no longer exists */
1772        base = branch->merge[0]->dst;
1773        if (read_ref(base, sha1))
1774                return -1;
1775        theirs = lookup_commit_reference(sha1);
1776        if (!theirs)
1777                return -1;
1778
1779        if (read_ref(branch->refname, sha1))
1780                return -1;
1781        ours = lookup_commit_reference(sha1);
1782        if (!ours)
1783                return -1;
1784
1785        /* are we the same? */
1786        if (theirs == ours) {
1787                *num_theirs = *num_ours = 0;
1788                return 1;
1789        }
1790
1791        /* Run "rev-list --left-right ours...theirs" internally... */
1792        rev_argc = 0;
1793        rev_argv[rev_argc++] = NULL;
1794        rev_argv[rev_argc++] = "--left-right";
1795        rev_argv[rev_argc++] = symmetric;
1796        rev_argv[rev_argc++] = "--";
1797        rev_argv[rev_argc] = NULL;
1798
1799        strcpy(symmetric, sha1_to_hex(ours->object.sha1));
1800        strcpy(symmetric + 40, "...");
1801        strcpy(symmetric + 43, sha1_to_hex(theirs->object.sha1));
1802
1803        init_revisions(&revs, NULL);
1804        setup_revisions(rev_argc, rev_argv, &revs, NULL);
1805        prepare_revision_walk(&revs);
1806
1807        /* ... and count the commits on each side. */
1808        *num_ours = 0;
1809        *num_theirs = 0;
1810        while (1) {
1811                struct commit *c = get_revision(&revs);
1812                if (!c)
1813                        break;
1814                if (c->object.flags & SYMMETRIC_LEFT)
1815                        (*num_ours)++;
1816                else
1817                        (*num_theirs)++;
1818        }
1819
1820        /* clear object flags smudged by the above traversal */
1821        clear_commit_marks(ours, ALL_REV_FLAGS);
1822        clear_commit_marks(theirs, ALL_REV_FLAGS);
1823        return 1;
1824}
1825
1826/*
1827 * Return true when there is anything to report, otherwise false.
1828 */
1829int format_tracking_info(struct branch *branch, struct strbuf *sb)
1830{
1831        int ours, theirs;
1832        const char *base;
1833        int upstream_is_gone = 0;
1834
1835        switch (stat_tracking_info(branch, &ours, &theirs)) {
1836        case 0:
1837                /* no base */
1838                return 0;
1839        case -1:
1840                /* with "gone" base */
1841                upstream_is_gone = 1;
1842                break;
1843        default:
1844                /* with base */
1845                break;
1846        }
1847
1848        base = branch->merge[0]->dst;
1849        base = shorten_unambiguous_ref(base, 0);
1850        if (upstream_is_gone) {
1851                strbuf_addf(sb,
1852                        _("Your branch is based on '%s', but the upstream is gone.\n"),
1853                        base);
1854                if (advice_status_hints)
1855                        strbuf_addf(sb,
1856                                _("  (use \"git branch --unset-upstream\" to fixup)\n"));
1857        } else if (!ours && !theirs) {
1858                strbuf_addf(sb,
1859                        _("Your branch is up-to-date with '%s'.\n"),
1860                        base);
1861        } else if (!theirs) {
1862                strbuf_addf(sb,
1863                        Q_("Your branch is ahead of '%s' by %d commit.\n",
1864                           "Your branch is ahead of '%s' by %d commits.\n",
1865                           ours),
1866                        base, ours);
1867                if (advice_status_hints)
1868                        strbuf_addf(sb,
1869                                _("  (use \"git push\" to publish your local commits)\n"));
1870        } else if (!ours) {
1871                strbuf_addf(sb,
1872                        Q_("Your branch is behind '%s' by %d commit, "
1873                               "and can be fast-forwarded.\n",
1874                           "Your branch is behind '%s' by %d commits, "
1875                               "and can be fast-forwarded.\n",
1876                           theirs),
1877                        base, theirs);
1878                if (advice_status_hints)
1879                        strbuf_addf(sb,
1880                                _("  (use \"git pull\" to update your local branch)\n"));
1881        } else {
1882                strbuf_addf(sb,
1883                        Q_("Your branch and '%s' have diverged,\n"
1884                               "and have %d and %d different commit each, "
1885                               "respectively.\n",
1886                           "Your branch and '%s' have diverged,\n"
1887                               "and have %d and %d different commits each, "
1888                               "respectively.\n",
1889                           theirs),
1890                        base, ours, theirs);
1891                if (advice_status_hints)
1892                        strbuf_addf(sb,
1893                                _("  (use \"git pull\" to merge the remote branch into yours)\n"));
1894        }
1895        return 1;
1896}
1897
1898static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
1899{
1900        struct ref ***local_tail = cb_data;
1901        struct ref *ref;
1902        int len;
1903
1904        /* we already know it starts with refs/ to get here */
1905        if (check_refname_format(refname + 5, 0))
1906                return 0;
1907
1908        len = strlen(refname) + 1;
1909        ref = xcalloc(1, sizeof(*ref) + len);
1910        hashcpy(ref->new_sha1, sha1);
1911        memcpy(ref->name, refname, len);
1912        **local_tail = ref;
1913        *local_tail = &ref->next;
1914        return 0;
1915}
1916
1917struct ref *get_local_heads(void)
1918{
1919        struct ref *local_refs = NULL, **local_tail = &local_refs;
1920        for_each_ref(one_local_ref, &local_tail);
1921        return local_refs;
1922}
1923
1924struct ref *guess_remote_head(const struct ref *head,
1925                              const struct ref *refs,
1926                              int all)
1927{
1928        const struct ref *r;
1929        struct ref *list = NULL;
1930        struct ref **tail = &list;
1931
1932        if (!head)
1933                return NULL;
1934
1935        /*
1936         * Some transports support directly peeking at
1937         * where HEAD points; if that is the case, then
1938         * we don't have to guess.
1939         */
1940        if (head->symref)
1941                return copy_ref(find_ref_by_name(refs, head->symref));
1942
1943        /* If refs/heads/master could be right, it is. */
1944        if (!all) {
1945                r = find_ref_by_name(refs, "refs/heads/master");
1946                if (r && !hashcmp(r->old_sha1, head->old_sha1))
1947                        return copy_ref(r);
1948        }
1949
1950        /* Look for another ref that points there */
1951        for (r = refs; r; r = r->next) {
1952                if (r != head &&
1953                    !prefixcmp(r->name, "refs/heads/") &&
1954                    !hashcmp(r->old_sha1, head->old_sha1)) {
1955                        *tail = copy_ref(r);
1956                        tail = &((*tail)->next);
1957                        if (!all)
1958                                break;
1959                }
1960        }
1961
1962        return list;
1963}
1964
1965struct stale_heads_info {
1966        struct string_list *ref_names;
1967        struct ref **stale_refs_tail;
1968        struct refspec *refs;
1969        int ref_count;
1970};
1971
1972static int get_stale_heads_cb(const char *refname,
1973        const unsigned char *sha1, int flags, void *cb_data)
1974{
1975        struct stale_heads_info *info = cb_data;
1976        struct refspec query;
1977        memset(&query, 0, sizeof(struct refspec));
1978        query.dst = (char *)refname;
1979
1980        if (query_refspecs(info->refs, info->ref_count, &query))
1981                return 0; /* No matches */
1982
1983        /*
1984         * If we did find a suitable refspec and it's not a symref and
1985         * it's not in the list of refs that currently exist in that
1986         * remote we consider it to be stale.
1987         */
1988        if (!((flags & REF_ISSYMREF) ||
1989              string_list_has_string(info->ref_names, query.src))) {
1990                struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
1991                hashcpy(ref->new_sha1, sha1);
1992        }
1993
1994        free(query.src);
1995        return 0;
1996}
1997
1998struct ref *get_stale_heads(struct refspec *refs, int ref_count, struct ref *fetch_map)
1999{
2000        struct ref *ref, *stale_refs = NULL;
2001        struct string_list ref_names = STRING_LIST_INIT_NODUP;
2002        struct stale_heads_info info;
2003        info.ref_names = &ref_names;
2004        info.stale_refs_tail = &stale_refs;
2005        info.refs = refs;
2006        info.ref_count = ref_count;
2007        for (ref = fetch_map; ref; ref = ref->next)
2008                string_list_append(&ref_names, ref->name);
2009        sort_string_list(&ref_names);
2010        for_each_ref(get_stale_heads_cb, &info);
2011        string_list_clear(&ref_names, 0);
2012        return stale_refs;
2013}
2014
2015/*
2016 * Compare-and-swap
2017 */
2018void clear_cas_option(struct push_cas_option *cas)
2019{
2020        int i;
2021
2022        for (i = 0; i < cas->nr; i++)
2023                free(cas->entry[i].refname);
2024        free(cas->entry);
2025        memset(cas, 0, sizeof(*cas));
2026}
2027
2028static struct push_cas *add_cas_entry(struct push_cas_option *cas,
2029                                      const char *refname,
2030                                      size_t refnamelen)
2031{
2032        struct push_cas *entry;
2033        ALLOC_GROW(cas->entry, cas->nr + 1, cas->alloc);
2034        entry = &cas->entry[cas->nr++];
2035        memset(entry, 0, sizeof(*entry));
2036        entry->refname = xmemdupz(refname, refnamelen);
2037        return entry;
2038}
2039
2040int parse_push_cas_option(struct push_cas_option *cas, const char *arg, int unset)
2041{
2042        const char *colon;
2043        struct push_cas *entry;
2044
2045        if (unset) {
2046                /* "--no-<option>" */
2047                clear_cas_option(cas);
2048                return 0;
2049        }
2050
2051        if (!arg) {
2052                /* just "--<option>" */
2053                cas->use_tracking_for_rest = 1;
2054                return 0;
2055        }
2056
2057        /* "--<option>=refname" or "--<option>=refname:value" */
2058        colon = strchrnul(arg, ':');
2059        entry = add_cas_entry(cas, arg, colon - arg);
2060        if (!*colon)
2061                entry->use_tracking = 1;
2062        else if (get_sha1(colon + 1, entry->expect))
2063                return error("cannot parse expected object name '%s'", colon + 1);
2064        return 0;
2065}
2066
2067int parseopt_push_cas_option(const struct option *opt, const char *arg, int unset)
2068{
2069        return parse_push_cas_option(opt->value, arg, unset);
2070}
2071
2072int is_empty_cas(const struct push_cas_option *cas)
2073{
2074        return !cas->use_tracking_for_rest && !cas->nr;
2075}
2076
2077/*
2078 * Look at remote.fetch refspec and see if we have a remote
2079 * tracking branch for the refname there.  Fill its current
2080 * value in sha1[].
2081 * If we cannot do so, return negative to signal an error.
2082 */
2083static int remote_tracking(struct remote *remote, const char *refname,
2084                           unsigned char sha1[20])
2085{
2086        char *dst;
2087
2088        dst = apply_refspecs(remote->fetch, remote->fetch_refspec_nr, refname);
2089        if (!dst)
2090                return -1; /* no tracking ref for refname at remote */
2091        if (read_ref(dst, sha1))
2092                return -1; /* we know what the tracking ref is but we cannot read it */
2093        return 0;
2094}
2095
2096static void apply_cas(struct push_cas_option *cas,
2097                      struct remote *remote,
2098                      struct ref *ref)
2099{
2100        int i;
2101
2102        /* Find an explicit --<option>=<name>[:<value>] entry */
2103        for (i = 0; i < cas->nr; i++) {
2104                struct push_cas *entry = &cas->entry[i];
2105                if (!refname_match(entry->refname, ref->name, ref_rev_parse_rules))
2106                        continue;
2107                ref->expect_old_sha1 = 1;
2108                if (!entry->use_tracking)
2109                        hashcpy(ref->old_sha1_expect, cas->entry[i].expect);
2110                else if (remote_tracking(remote, ref->name, ref->old_sha1_expect))
2111                        ref->expect_old_no_trackback = 1;
2112                return;
2113        }
2114
2115        /* Are we using "--<option>" to cover all? */
2116        if (!cas->use_tracking_for_rest)
2117                return;
2118
2119        ref->expect_old_sha1 = 1;
2120        if (remote_tracking(remote, ref->name, ref->old_sha1_expect))
2121                ref->expect_old_no_trackback = 1;
2122}
2123
2124void apply_push_cas(struct push_cas_option *cas,
2125                    struct remote *remote,
2126                    struct ref *remote_refs)
2127{
2128        struct ref *ref;
2129        for (ref = remote_refs; ref; ref = ref->next)
2130                apply_cas(cas, remote, ref);
2131}