remote.con commit add: make pathless 'add [-u|-A]' warning a file-global function (e24afab)
   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        "refs/tags/*",
  19        "refs/tags/*"
  20};
  21
  22const struct refspec *tag_refspec = &s_tag_refspec;
  23
  24struct counted_string {
  25        size_t len;
  26        const char *s;
  27};
  28struct rewrite {
  29        const char *base;
  30        size_t baselen;
  31        struct counted_string *instead_of;
  32        int instead_of_nr;
  33        int instead_of_alloc;
  34};
  35struct rewrites {
  36        struct rewrite **rewrite;
  37        int rewrite_alloc;
  38        int rewrite_nr;
  39};
  40
  41static struct remote **remotes;
  42static int remotes_alloc;
  43static int remotes_nr;
  44
  45static struct branch **branches;
  46static int branches_alloc;
  47static int branches_nr;
  48
  49static struct branch *current_branch;
  50static const char *default_remote_name;
  51static int explicit_default_remote_name;
  52
  53static struct rewrites rewrites;
  54static struct rewrites rewrites_push;
  55
  56#define BUF_SIZE (2048)
  57static char buffer[BUF_SIZE];
  58
  59static int valid_remote(const struct remote *remote)
  60{
  61        return (!!remote->url) || (!!remote->foreign_vcs);
  62}
  63
  64static const char *alias_url(const char *url, struct rewrites *r)
  65{
  66        int i, j;
  67        char *ret;
  68        struct counted_string *longest;
  69        int longest_i;
  70
  71        longest = NULL;
  72        longest_i = -1;
  73        for (i = 0; i < r->rewrite_nr; i++) {
  74                if (!r->rewrite[i])
  75                        continue;
  76                for (j = 0; j < r->rewrite[i]->instead_of_nr; j++) {
  77                        if (!prefixcmp(url, r->rewrite[i]->instead_of[j].s) &&
  78                            (!longest ||
  79                             longest->len < r->rewrite[i]->instead_of[j].len)) {
  80                                longest = &(r->rewrite[i]->instead_of[j]);
  81                                longest_i = i;
  82                        }
  83                }
  84        }
  85        if (!longest)
  86                return url;
  87
  88        ret = xmalloc(r->rewrite[longest_i]->baselen +
  89                     (strlen(url) - longest->len) + 1);
  90        strcpy(ret, r->rewrite[longest_i]->base);
  91        strcpy(ret + r->rewrite[longest_i]->baselen, url + longest->len);
  92        return ret;
  93}
  94
  95static void add_push_refspec(struct remote *remote, const char *ref)
  96{
  97        ALLOC_GROW(remote->push_refspec,
  98                   remote->push_refspec_nr + 1,
  99                   remote->push_refspec_alloc);
 100        remote->push_refspec[remote->push_refspec_nr++] = ref;
 101}
 102
 103static void add_fetch_refspec(struct remote *remote, const char *ref)
 104{
 105        ALLOC_GROW(remote->fetch_refspec,
 106                   remote->fetch_refspec_nr + 1,
 107                   remote->fetch_refspec_alloc);
 108        remote->fetch_refspec[remote->fetch_refspec_nr++] = ref;
 109}
 110
 111static void add_url(struct remote *remote, const char *url)
 112{
 113        ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
 114        remote->url[remote->url_nr++] = url;
 115}
 116
 117static void add_pushurl(struct remote *remote, const char *pushurl)
 118{
 119        ALLOC_GROW(remote->pushurl, remote->pushurl_nr + 1, remote->pushurl_alloc);
 120        remote->pushurl[remote->pushurl_nr++] = pushurl;
 121}
 122
 123static void add_pushurl_alias(struct remote *remote, const char *url)
 124{
 125        const char *pushurl = alias_url(url, &rewrites_push);
 126        if (pushurl != url)
 127                add_pushurl(remote, pushurl);
 128}
 129
 130static void add_url_alias(struct remote *remote, const char *url)
 131{
 132        add_url(remote, alias_url(url, &rewrites));
 133        add_pushurl_alias(remote, url);
 134}
 135
 136static struct remote *make_remote(const char *name, int len)
 137{
 138        struct remote *ret;
 139        int i;
 140
 141        for (i = 0; i < remotes_nr; i++) {
 142                if (len ? (!strncmp(name, remotes[i]->name, len) &&
 143                           !remotes[i]->name[len]) :
 144                    !strcmp(name, remotes[i]->name))
 145                        return remotes[i];
 146        }
 147
 148        ret = xcalloc(1, sizeof(struct remote));
 149        ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
 150        remotes[remotes_nr++] = ret;
 151        if (len)
 152                ret->name = xstrndup(name, len);
 153        else
 154                ret->name = xstrdup(name);
 155        return ret;
 156}
 157
 158static void add_merge(struct branch *branch, const char *name)
 159{
 160        ALLOC_GROW(branch->merge_name, branch->merge_nr + 1,
 161                   branch->merge_alloc);
 162        branch->merge_name[branch->merge_nr++] = name;
 163}
 164
 165static struct branch *make_branch(const char *name, int len)
 166{
 167        struct branch *ret;
 168        int i;
 169        char *refname;
 170
 171        for (i = 0; i < branches_nr; i++) {
 172                if (len ? (!strncmp(name, branches[i]->name, len) &&
 173                           !branches[i]->name[len]) :
 174                    !strcmp(name, branches[i]->name))
 175                        return branches[i];
 176        }
 177
 178        ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
 179        ret = xcalloc(1, sizeof(struct branch));
 180        branches[branches_nr++] = ret;
 181        if (len)
 182                ret->name = xstrndup(name, len);
 183        else
 184                ret->name = xstrdup(name);
 185        refname = xmalloc(strlen(name) + strlen("refs/heads/") + 1);
 186        strcpy(refname, "refs/heads/");
 187        strcpy(refname + strlen("refs/heads/"), ret->name);
 188        ret->refname = refname;
 189
 190        return ret;
 191}
 192
 193static struct rewrite *make_rewrite(struct rewrites *r, const char *base, int len)
 194{
 195        struct rewrite *ret;
 196        int i;
 197
 198        for (i = 0; i < r->rewrite_nr; i++) {
 199                if (len
 200                    ? (len == r->rewrite[i]->baselen &&
 201                       !strncmp(base, r->rewrite[i]->base, len))
 202                    : !strcmp(base, r->rewrite[i]->base))
 203                        return r->rewrite[i];
 204        }
 205
 206        ALLOC_GROW(r->rewrite, r->rewrite_nr + 1, r->rewrite_alloc);
 207        ret = xcalloc(1, sizeof(struct rewrite));
 208        r->rewrite[r->rewrite_nr++] = ret;
 209        if (len) {
 210                ret->base = xstrndup(base, len);
 211                ret->baselen = len;
 212        }
 213        else {
 214                ret->base = xstrdup(base);
 215                ret->baselen = strlen(base);
 216        }
 217        return ret;
 218}
 219
 220static void add_instead_of(struct rewrite *rewrite, const char *instead_of)
 221{
 222        ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
 223        rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
 224        rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
 225        rewrite->instead_of_nr++;
 226}
 227
 228static void read_remotes_file(struct remote *remote)
 229{
 230        FILE *f = fopen(git_path("remotes/%s", remote->name), "r");
 231
 232        if (!f)
 233                return;
 234        remote->origin = REMOTE_REMOTES;
 235        while (fgets(buffer, BUF_SIZE, f)) {
 236                int value_list;
 237                char *s, *p;
 238
 239                if (!prefixcmp(buffer, "URL:")) {
 240                        value_list = 0;
 241                        s = buffer + 4;
 242                } else if (!prefixcmp(buffer, "Push:")) {
 243                        value_list = 1;
 244                        s = buffer + 5;
 245                } else if (!prefixcmp(buffer, "Pull:")) {
 246                        value_list = 2;
 247                        s = buffer + 5;
 248                } else
 249                        continue;
 250
 251                while (isspace(*s))
 252                        s++;
 253                if (!*s)
 254                        continue;
 255
 256                p = s + strlen(s);
 257                while (isspace(p[-1]))
 258                        *--p = 0;
 259
 260                switch (value_list) {
 261                case 0:
 262                        add_url_alias(remote, xstrdup(s));
 263                        break;
 264                case 1:
 265                        add_push_refspec(remote, xstrdup(s));
 266                        break;
 267                case 2:
 268                        add_fetch_refspec(remote, xstrdup(s));
 269                        break;
 270                }
 271        }
 272        fclose(f);
 273}
 274
 275static void read_branches_file(struct remote *remote)
 276{
 277        const char *slash = strchr(remote->name, '/');
 278        char *frag;
 279        struct strbuf branch = STRBUF_INIT;
 280        int n = slash ? slash - remote->name : 1000;
 281        FILE *f = fopen(git_path("branches/%.*s", n, remote->name), "r");
 282        char *s, *p;
 283        int len;
 284
 285        if (!f)
 286                return;
 287        s = fgets(buffer, BUF_SIZE, f);
 288        fclose(f);
 289        if (!s)
 290                return;
 291        while (isspace(*s))
 292                s++;
 293        if (!*s)
 294                return;
 295        remote->origin = REMOTE_BRANCHES;
 296        p = s + strlen(s);
 297        while (isspace(p[-1]))
 298                *--p = 0;
 299        len = p - s;
 300        if (slash)
 301                len += strlen(slash);
 302        p = xmalloc(len + 1);
 303        strcpy(p, s);
 304        if (slash)
 305                strcat(p, slash);
 306
 307        /*
 308         * With "slash", e.g. "git fetch jgarzik/netdev-2.6" when
 309         * reading from $GIT_DIR/branches/jgarzik fetches "HEAD" from
 310         * the partial URL obtained from the branches file plus
 311         * "/netdev-2.6" and does not store it in any tracking ref.
 312         * #branch specifier in the file is ignored.
 313         *
 314         * Otherwise, the branches file would have URL and optionally
 315         * #branch specified.  The "master" (or specified) branch is
 316         * fetched and stored in the local branch of the same name.
 317         */
 318        frag = strchr(p, '#');
 319        if (frag) {
 320                *(frag++) = '\0';
 321                strbuf_addf(&branch, "refs/heads/%s", frag);
 322        } else
 323                strbuf_addstr(&branch, "refs/heads/master");
 324        if (!slash) {
 325                strbuf_addf(&branch, ":refs/heads/%s", remote->name);
 326        } else {
 327                strbuf_reset(&branch);
 328                strbuf_addstr(&branch, "HEAD:");
 329        }
 330        add_url_alias(remote, p);
 331        add_fetch_refspec(remote, strbuf_detach(&branch, NULL));
 332        /*
 333         * Cogito compatible push: push current HEAD to remote #branch
 334         * (master if missing)
 335         */
 336        strbuf_init(&branch, 0);
 337        strbuf_addstr(&branch, "HEAD");
 338        if (frag)
 339                strbuf_addf(&branch, ":refs/heads/%s", frag);
 340        else
 341                strbuf_addstr(&branch, ":refs/heads/master");
 342        add_push_refspec(remote, strbuf_detach(&branch, NULL));
 343        remote->fetch_tags = 1; /* always auto-follow */
 344}
 345
 346static int handle_config(const char *key, const char *value, void *cb)
 347{
 348        const char *name;
 349        const char *subkey;
 350        struct remote *remote;
 351        struct branch *branch;
 352        if (!prefixcmp(key, "branch.")) {
 353                name = key + 7;
 354                subkey = strrchr(name, '.');
 355                if (!subkey)
 356                        return 0;
 357                branch = make_branch(name, subkey - name);
 358                if (!strcmp(subkey, ".remote")) {
 359                        if (!value)
 360                                return config_error_nonbool(key);
 361                        branch->remote_name = xstrdup(value);
 362                        if (branch == current_branch) {
 363                                default_remote_name = branch->remote_name;
 364                                explicit_default_remote_name = 1;
 365                        }
 366                } else if (!strcmp(subkey, ".merge")) {
 367                        if (!value)
 368                                return config_error_nonbool(key);
 369                        add_merge(branch, xstrdup(value));
 370                }
 371                return 0;
 372        }
 373        if (!prefixcmp(key, "url.")) {
 374                struct rewrite *rewrite;
 375                name = key + 4;
 376                subkey = strrchr(name, '.');
 377                if (!subkey)
 378                        return 0;
 379                if (!strcmp(subkey, ".insteadof")) {
 380                        rewrite = make_rewrite(&rewrites, name, subkey - name);
 381                        if (!value)
 382                                return config_error_nonbool(key);
 383                        add_instead_of(rewrite, xstrdup(value));
 384                } else if (!strcmp(subkey, ".pushinsteadof")) {
 385                        rewrite = make_rewrite(&rewrites_push, name, subkey - name);
 386                        if (!value)
 387                                return config_error_nonbool(key);
 388                        add_instead_of(rewrite, xstrdup(value));
 389                }
 390        }
 391        if (prefixcmp(key,  "remote."))
 392                return 0;
 393        name = key + 7;
 394        if (*name == '/') {
 395                warning("Config remote shorthand cannot begin with '/': %s",
 396                        name);
 397                return 0;
 398        }
 399        subkey = strrchr(name, '.');
 400        if (!subkey)
 401                return 0;
 402        remote = make_remote(name, subkey - name);
 403        remote->origin = REMOTE_CONFIG;
 404        if (!strcmp(subkey, ".mirror"))
 405                remote->mirror = git_config_bool(key, value);
 406        else if (!strcmp(subkey, ".skipdefaultupdate"))
 407                remote->skip_default_update = git_config_bool(key, value);
 408        else if (!strcmp(subkey, ".skipfetchall"))
 409                remote->skip_default_update = 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 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                        /*
 569                         * LHS
 570                         * - empty is allowed; it means HEAD.
 571                         * - otherwise it must be a valid looking ref.
 572                         */
 573                        if (!*rs[i].src)
 574                                ; /* empty is ok */
 575                        else if (check_refname_format(rs[i].src, flags))
 576                                goto invalid;
 577                        /*
 578                         * RHS
 579                         * - missing is ok, and is same as empty.
 580                         * - empty is ok; it means not to store.
 581                         * - otherwise it must be a valid looking ref.
 582                         */
 583                        if (!rs[i].dst)
 584                                ; /* ok */
 585                        else if (!*rs[i].dst)
 586                                ; /* ok */
 587                        else if (check_refname_format(rs[i].dst, flags))
 588                                goto invalid;
 589                } else {
 590                        /*
 591                         * LHS
 592                         * - empty is allowed; it means delete.
 593                         * - when wildcarded, it must be a valid looking ref.
 594                         * - otherwise, it must be an extended SHA-1, but
 595                         *   there is no existing way to validate this.
 596                         */
 597                        if (!*rs[i].src)
 598                                ; /* empty is ok */
 599                        else if (is_glob) {
 600                                if (check_refname_format(rs[i].src, flags))
 601                                        goto invalid;
 602                        }
 603                        else
 604                                ; /* anything goes, for now */
 605                        /*
 606                         * RHS
 607                         * - missing is allowed, but LHS then must be a
 608                         *   valid looking ref.
 609                         * - empty is not allowed.
 610                         * - otherwise it must be a valid looking ref.
 611                         */
 612                        if (!rs[i].dst) {
 613                                if (check_refname_format(rs[i].src, flags))
 614                                        goto invalid;
 615                        } else if (!*rs[i].dst) {
 616                                goto invalid;
 617                        } else {
 618                                if (check_refname_format(rs[i].dst, flags))
 619                                        goto invalid;
 620                        }
 621                }
 622        }
 623        return rs;
 624
 625 invalid:
 626        if (verify) {
 627                /*
 628                 * nr_refspec must be greater than zero and i must be valid
 629                 * since it is only possible to reach this point from within
 630                 * the for loop above.
 631                 */
 632                free_refspecs(rs, i+1);
 633                return NULL;
 634        }
 635        die("Invalid refspec '%s'", refspec[i]);
 636}
 637
 638int valid_fetch_refspec(const char *fetch_refspec_str)
 639{
 640        struct refspec *refspec;
 641
 642        refspec = parse_refspec_internal(1, &fetch_refspec_str, 1, 1);
 643        free_refspecs(refspec, 1);
 644        return !!refspec;
 645}
 646
 647struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec)
 648{
 649        return parse_refspec_internal(nr_refspec, refspec, 1, 0);
 650}
 651
 652static struct refspec *parse_push_refspec(int nr_refspec, const char **refspec)
 653{
 654        return parse_refspec_internal(nr_refspec, refspec, 0, 0);
 655}
 656
 657void free_refspec(int nr_refspec, struct refspec *refspec)
 658{
 659        int i;
 660        for (i = 0; i < nr_refspec; i++) {
 661                free(refspec[i].src);
 662                free(refspec[i].dst);
 663        }
 664        free(refspec);
 665}
 666
 667static int valid_remote_nick(const char *name)
 668{
 669        if (!name[0] || is_dot_or_dotdot(name))
 670                return 0;
 671        return !strchr(name, '/'); /* no slash */
 672}
 673
 674struct remote *remote_get(const char *name)
 675{
 676        struct remote *ret;
 677        int name_given = 0;
 678
 679        read_config();
 680        if (name)
 681                name_given = 1;
 682        else {
 683                name = default_remote_name;
 684                name_given = explicit_default_remote_name;
 685        }
 686
 687        ret = make_remote(name, 0);
 688        if (valid_remote_nick(name)) {
 689                if (!valid_remote(ret))
 690                        read_remotes_file(ret);
 691                if (!valid_remote(ret))
 692                        read_branches_file(ret);
 693        }
 694        if (name_given && !valid_remote(ret))
 695                add_url_alias(ret, name);
 696        if (!valid_remote(ret))
 697                return NULL;
 698        ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
 699        ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
 700        return ret;
 701}
 702
 703int remote_is_configured(const char *name)
 704{
 705        int i;
 706        read_config();
 707
 708        for (i = 0; i < remotes_nr; i++)
 709                if (!strcmp(name, remotes[i]->name))
 710                        return 1;
 711        return 0;
 712}
 713
 714int for_each_remote(each_remote_fn fn, void *priv)
 715{
 716        int i, result = 0;
 717        read_config();
 718        for (i = 0; i < remotes_nr && !result; i++) {
 719                struct remote *r = remotes[i];
 720                if (!r)
 721                        continue;
 722                if (!r->fetch)
 723                        r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
 724                                                       r->fetch_refspec);
 725                if (!r->push)
 726                        r->push = parse_push_refspec(r->push_refspec_nr,
 727                                                     r->push_refspec);
 728                result = fn(r, priv);
 729        }
 730        return result;
 731}
 732
 733void ref_remove_duplicates(struct ref *ref_map)
 734{
 735        struct string_list refs = STRING_LIST_INIT_NODUP;
 736        struct string_list_item *item = NULL;
 737        struct ref *prev = NULL, *next = NULL;
 738        for (; ref_map; prev = ref_map, ref_map = next) {
 739                next = ref_map->next;
 740                if (!ref_map->peer_ref)
 741                        continue;
 742
 743                item = string_list_lookup(&refs, ref_map->peer_ref->name);
 744                if (item) {
 745                        if (strcmp(((struct ref *)item->util)->name,
 746                                   ref_map->name))
 747                                die("%s tracks both %s and %s",
 748                                    ref_map->peer_ref->name,
 749                                    ((struct ref *)item->util)->name,
 750                                    ref_map->name);
 751                        prev->next = ref_map->next;
 752                        free(ref_map->peer_ref);
 753                        free(ref_map);
 754                        ref_map = prev; /* skip this; we freed it */
 755                        continue;
 756                }
 757
 758                item = string_list_insert(&refs, ref_map->peer_ref->name);
 759                item->util = ref_map;
 760        }
 761        string_list_clear(&refs, 0);
 762}
 763
 764int remote_has_url(struct remote *remote, const char *url)
 765{
 766        int i;
 767        for (i = 0; i < remote->url_nr; i++) {
 768                if (!strcmp(remote->url[i], url))
 769                        return 1;
 770        }
 771        return 0;
 772}
 773
 774static int match_name_with_pattern(const char *key, const char *name,
 775                                   const char *value, char **result)
 776{
 777        const char *kstar = strchr(key, '*');
 778        size_t klen;
 779        size_t ksuffixlen;
 780        size_t namelen;
 781        int ret;
 782        if (!kstar)
 783                die("Key '%s' of pattern had no '*'", key);
 784        klen = kstar - key;
 785        ksuffixlen = strlen(kstar + 1);
 786        namelen = strlen(name);
 787        ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
 788                !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
 789        if (ret && value) {
 790                const char *vstar = strchr(value, '*');
 791                size_t vlen;
 792                size_t vsuffixlen;
 793                if (!vstar)
 794                        die("Value '%s' of pattern has no '*'", value);
 795                vlen = vstar - value;
 796                vsuffixlen = strlen(vstar + 1);
 797                *result = xmalloc(vlen + vsuffixlen +
 798                                  strlen(name) -
 799                                  klen - ksuffixlen + 1);
 800                strncpy(*result, value, vlen);
 801                strncpy(*result + vlen,
 802                        name + klen, namelen - klen - ksuffixlen);
 803                strcpy(*result + vlen + namelen - klen - ksuffixlen,
 804                       vstar + 1);
 805        }
 806        return ret;
 807}
 808
 809static int query_refspecs(struct refspec *refs, int ref_count, struct refspec *query)
 810{
 811        int i;
 812        int find_src = !query->src;
 813
 814        if (find_src && !query->dst)
 815                return error("query_refspecs: need either src or dst");
 816
 817        for (i = 0; i < ref_count; i++) {
 818                struct refspec *refspec = &refs[i];
 819                const char *key = find_src ? refspec->dst : refspec->src;
 820                const char *value = find_src ? refspec->src : refspec->dst;
 821                const char *needle = find_src ? query->dst : query->src;
 822                char **result = find_src ? &query->src : &query->dst;
 823
 824                if (!refspec->dst)
 825                        continue;
 826                if (refspec->pattern) {
 827                        if (match_name_with_pattern(key, needle, value, result)) {
 828                                query->force = refspec->force;
 829                                return 0;
 830                        }
 831                } else if (!strcmp(needle, key)) {
 832                        *result = xstrdup(value);
 833                        query->force = refspec->force;
 834                        return 0;
 835                }
 836        }
 837        return -1;
 838}
 839
 840char *apply_refspecs(struct refspec *refspecs, int nr_refspec,
 841                     const char *name)
 842{
 843        struct refspec query;
 844
 845        memset(&query, 0, sizeof(struct refspec));
 846        query.src = (char *)name;
 847
 848        if (query_refspecs(refspecs, nr_refspec, &query))
 849                return NULL;
 850
 851        return query.dst;
 852}
 853
 854int remote_find_tracking(struct remote *remote, struct refspec *refspec)
 855{
 856        return query_refspecs(remote->fetch, remote->fetch_refspec_nr, refspec);
 857}
 858
 859static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
 860                const char *name)
 861{
 862        size_t len = strlen(name);
 863        struct ref *ref = xcalloc(1, sizeof(struct ref) + prefixlen + len + 1);
 864        memcpy(ref->name, prefix, prefixlen);
 865        memcpy(ref->name + prefixlen, name, len);
 866        return ref;
 867}
 868
 869struct ref *alloc_ref(const char *name)
 870{
 871        return alloc_ref_with_prefix("", 0, name);
 872}
 873
 874struct ref *copy_ref(const struct ref *ref)
 875{
 876        struct ref *cpy;
 877        size_t len;
 878        if (!ref)
 879                return NULL;
 880        len = strlen(ref->name);
 881        cpy = xmalloc(sizeof(struct ref) + len + 1);
 882        memcpy(cpy, ref, sizeof(struct ref) + len + 1);
 883        cpy->next = NULL;
 884        cpy->symref = ref->symref ? xstrdup(ref->symref) : NULL;
 885        cpy->remote_status = ref->remote_status ? xstrdup(ref->remote_status) : NULL;
 886        cpy->peer_ref = copy_ref(ref->peer_ref);
 887        return cpy;
 888}
 889
 890struct ref *copy_ref_list(const struct ref *ref)
 891{
 892        struct ref *ret = NULL;
 893        struct ref **tail = &ret;
 894        while (ref) {
 895                *tail = copy_ref(ref);
 896                ref = ref->next;
 897                tail = &((*tail)->next);
 898        }
 899        return ret;
 900}
 901
 902static void free_ref(struct ref *ref)
 903{
 904        if (!ref)
 905                return;
 906        free_ref(ref->peer_ref);
 907        free(ref->remote_status);
 908        free(ref->symref);
 909        free(ref);
 910}
 911
 912void free_refs(struct ref *ref)
 913{
 914        struct ref *next;
 915        while (ref) {
 916                next = ref->next;
 917                free_ref(ref);
 918                ref = next;
 919        }
 920}
 921
 922int ref_compare_name(const void *va, const void *vb)
 923{
 924        const struct ref *a = va, *b = vb;
 925        return strcmp(a->name, b->name);
 926}
 927
 928static void *ref_list_get_next(const void *a)
 929{
 930        return ((const struct ref *)a)->next;
 931}
 932
 933static void ref_list_set_next(void *a, void *next)
 934{
 935        ((struct ref *)a)->next = next;
 936}
 937
 938void sort_ref_list(struct ref **l, int (*cmp)(const void *, const void *))
 939{
 940        *l = llist_mergesort(*l, ref_list_get_next, ref_list_set_next, cmp);
 941}
 942
 943static int count_refspec_match(const char *pattern,
 944                               struct ref *refs,
 945                               struct ref **matched_ref)
 946{
 947        int patlen = strlen(pattern);
 948        struct ref *matched_weak = NULL;
 949        struct ref *matched = NULL;
 950        int weak_match = 0;
 951        int match = 0;
 952
 953        for (weak_match = match = 0; refs; refs = refs->next) {
 954                char *name = refs->name;
 955                int namelen = strlen(name);
 956
 957                if (!refname_match(pattern, name, ref_rev_parse_rules))
 958                        continue;
 959
 960                /* A match is "weak" if it is with refs outside
 961                 * heads or tags, and did not specify the pattern
 962                 * in full (e.g. "refs/remotes/origin/master") or at
 963                 * least from the toplevel (e.g. "remotes/origin/master");
 964                 * otherwise "git push $URL master" would result in
 965                 * ambiguity between remotes/origin/master and heads/master
 966                 * at the remote site.
 967                 */
 968                if (namelen != patlen &&
 969                    patlen != namelen - 5 &&
 970                    prefixcmp(name, "refs/heads/") &&
 971                    prefixcmp(name, "refs/tags/")) {
 972                        /* We want to catch the case where only weak
 973                         * matches are found and there are multiple
 974                         * matches, and where more than one strong
 975                         * matches are found, as ambiguous.  One
 976                         * strong match with zero or more weak matches
 977                         * are acceptable as a unique match.
 978                         */
 979                        matched_weak = refs;
 980                        weak_match++;
 981                }
 982                else {
 983                        matched = refs;
 984                        match++;
 985                }
 986        }
 987        if (!matched) {
 988                *matched_ref = matched_weak;
 989                return weak_match;
 990        }
 991        else {
 992                *matched_ref = matched;
 993                return match;
 994        }
 995}
 996
 997static void tail_link_ref(struct ref *ref, struct ref ***tail)
 998{
 999        **tail = ref;
1000        while (ref->next)
1001                ref = ref->next;
1002        *tail = &ref->next;
1003}
1004
1005static struct ref *alloc_delete_ref(void)
1006{
1007        struct ref *ref = alloc_ref("(delete)");
1008        hashclr(ref->new_sha1);
1009        return ref;
1010}
1011
1012static struct ref *try_explicit_object_name(const char *name)
1013{
1014        unsigned char sha1[20];
1015        struct ref *ref;
1016
1017        if (!*name)
1018                return alloc_delete_ref();
1019        if (get_sha1(name, sha1))
1020                return NULL;
1021        ref = alloc_ref(name);
1022        hashcpy(ref->new_sha1, sha1);
1023        return ref;
1024}
1025
1026static struct ref *make_linked_ref(const char *name, struct ref ***tail)
1027{
1028        struct ref *ret = alloc_ref(name);
1029        tail_link_ref(ret, tail);
1030        return ret;
1031}
1032
1033static char *guess_ref(const char *name, struct ref *peer)
1034{
1035        struct strbuf buf = STRBUF_INIT;
1036        unsigned char sha1[20];
1037
1038        const char *r = resolve_ref_unsafe(peer->name, sha1, 1, NULL);
1039        if (!r)
1040                return NULL;
1041
1042        if (!prefixcmp(r, "refs/heads/"))
1043                strbuf_addstr(&buf, "refs/heads/");
1044        else if (!prefixcmp(r, "refs/tags/"))
1045                strbuf_addstr(&buf, "refs/tags/");
1046        else
1047                return NULL;
1048
1049        strbuf_addstr(&buf, name);
1050        return strbuf_detach(&buf, NULL);
1051}
1052
1053static int match_explicit(struct ref *src, struct ref *dst,
1054                          struct ref ***dst_tail,
1055                          struct refspec *rs)
1056{
1057        struct ref *matched_src, *matched_dst;
1058        int copy_src;
1059
1060        const char *dst_value = rs->dst;
1061        char *dst_guess;
1062
1063        if (rs->pattern || rs->matching)
1064                return 0;
1065
1066        matched_src = matched_dst = NULL;
1067        switch (count_refspec_match(rs->src, src, &matched_src)) {
1068        case 1:
1069                copy_src = 1;
1070                break;
1071        case 0:
1072                /* The source could be in the get_sha1() format
1073                 * not a reference name.  :refs/other is a
1074                 * way to delete 'other' ref at the remote end.
1075                 */
1076                matched_src = try_explicit_object_name(rs->src);
1077                if (!matched_src)
1078                        return error("src refspec %s does not match any.", rs->src);
1079                copy_src = 0;
1080                break;
1081        default:
1082                return error("src refspec %s matches more than one.", rs->src);
1083        }
1084
1085        if (!dst_value) {
1086                unsigned char sha1[20];
1087                int flag;
1088
1089                dst_value = resolve_ref_unsafe(matched_src->name, sha1, 1, &flag);
1090                if (!dst_value ||
1091                    ((flag & REF_ISSYMREF) &&
1092                     prefixcmp(dst_value, "refs/heads/")))
1093                        die("%s cannot be resolved to branch.",
1094                            matched_src->name);
1095        }
1096
1097        switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1098        case 1:
1099                break;
1100        case 0:
1101                if (!memcmp(dst_value, "refs/", 5))
1102                        matched_dst = make_linked_ref(dst_value, dst_tail);
1103                else if (is_null_sha1(matched_src->new_sha1))
1104                        error("unable to delete '%s': remote ref does not exist",
1105                              dst_value);
1106                else if ((dst_guess = guess_ref(dst_value, matched_src)))
1107                        matched_dst = make_linked_ref(dst_guess, dst_tail);
1108                else
1109                        error("unable to push to unqualified destination: %s\n"
1110                              "The destination refspec neither matches an "
1111                              "existing ref on the remote nor\n"
1112                              "begins with refs/, and we are unable to "
1113                              "guess a prefix based on the source ref.",
1114                              dst_value);
1115                break;
1116        default:
1117                matched_dst = NULL;
1118                error("dst refspec %s matches more than one.",
1119                      dst_value);
1120                break;
1121        }
1122        if (!matched_dst)
1123                return -1;
1124        if (matched_dst->peer_ref)
1125                return error("dst ref %s receives from more than one src.",
1126                      matched_dst->name);
1127        else {
1128                matched_dst->peer_ref = copy_src ? copy_ref(matched_src) : matched_src;
1129                matched_dst->force = rs->force;
1130        }
1131        return 0;
1132}
1133
1134static int match_explicit_refs(struct ref *src, struct ref *dst,
1135                               struct ref ***dst_tail, struct refspec *rs,
1136                               int rs_nr)
1137{
1138        int i, errs;
1139        for (i = errs = 0; i < rs_nr; i++)
1140                errs += match_explicit(src, dst, dst_tail, &rs[i]);
1141        return errs;
1142}
1143
1144static char *get_ref_match(const struct refspec *rs, int rs_nr, const struct ref *ref,
1145                int send_mirror, int direction, const struct refspec **ret_pat)
1146{
1147        const struct refspec *pat;
1148        char *name;
1149        int i;
1150        int matching_refs = -1;
1151        for (i = 0; i < rs_nr; i++) {
1152                if (rs[i].matching &&
1153                    (matching_refs == -1 || rs[i].force)) {
1154                        matching_refs = i;
1155                        continue;
1156                }
1157
1158                if (rs[i].pattern) {
1159                        const char *dst_side = rs[i].dst ? rs[i].dst : rs[i].src;
1160                        int match;
1161                        if (direction == FROM_SRC)
1162                                match = match_name_with_pattern(rs[i].src, ref->name, dst_side, &name);
1163                        else
1164                                match = match_name_with_pattern(dst_side, ref->name, rs[i].src, &name);
1165                        if (match) {
1166                                matching_refs = i;
1167                                break;
1168                        }
1169                }
1170        }
1171        if (matching_refs == -1)
1172                return NULL;
1173
1174        pat = rs + matching_refs;
1175        if (pat->matching) {
1176                /*
1177                 * "matching refs"; traditionally we pushed everything
1178                 * including refs outside refs/heads/ hierarchy, but
1179                 * that does not make much sense these days.
1180                 */
1181                if (!send_mirror && prefixcmp(ref->name, "refs/heads/"))
1182                        return NULL;
1183                name = xstrdup(ref->name);
1184        }
1185        if (ret_pat)
1186                *ret_pat = pat;
1187        return name;
1188}
1189
1190static struct ref **tail_ref(struct ref **head)
1191{
1192        struct ref **tail = head;
1193        while (*tail)
1194                tail = &((*tail)->next);
1195        return tail;
1196}
1197
1198/*
1199 * Given the set of refs the local repository has, the set of refs the
1200 * remote repository has, and the refspec used for push, determine
1201 * what remote refs we will update and with what value by setting
1202 * peer_ref (which object is being pushed) and force (if the push is
1203 * forced) in elements of "dst". The function may add new elements to
1204 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
1205 */
1206int match_push_refs(struct ref *src, struct ref **dst,
1207                    int nr_refspec, const char **refspec, int flags)
1208{
1209        struct refspec *rs;
1210        int send_all = flags & MATCH_REFS_ALL;
1211        int send_mirror = flags & MATCH_REFS_MIRROR;
1212        int send_prune = flags & MATCH_REFS_PRUNE;
1213        int errs;
1214        static const char *default_refspec[] = { ":", NULL };
1215        struct ref *ref, **dst_tail = tail_ref(dst);
1216
1217        if (!nr_refspec) {
1218                nr_refspec = 1;
1219                refspec = default_refspec;
1220        }
1221        rs = parse_push_refspec(nr_refspec, (const char **) refspec);
1222        errs = match_explicit_refs(src, *dst, &dst_tail, rs, nr_refspec);
1223
1224        /* pick the remainder */
1225        for (ref = src; ref; ref = ref->next) {
1226                struct ref *dst_peer;
1227                const struct refspec *pat = NULL;
1228                char *dst_name;
1229
1230                if (ref->peer_ref)
1231                        continue;
1232
1233                dst_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_SRC, &pat);
1234                if (!dst_name)
1235                        continue;
1236
1237                dst_peer = find_ref_by_name(*dst, dst_name);
1238                if (dst_peer) {
1239                        if (dst_peer->peer_ref)
1240                                /* We're already sending something to this ref. */
1241                                goto free_name;
1242                } else {
1243                        if (pat->matching && !(send_all || send_mirror))
1244                                /*
1245                                 * Remote doesn't have it, and we have no
1246                                 * explicit pattern, and we don't have
1247                                 * --all nor --mirror.
1248                                 */
1249                                goto free_name;
1250
1251                        /* Create a new one and link it */
1252                        dst_peer = make_linked_ref(dst_name, &dst_tail);
1253                        hashcpy(dst_peer->new_sha1, ref->new_sha1);
1254                }
1255                dst_peer->peer_ref = copy_ref(ref);
1256                dst_peer->force = pat->force;
1257        free_name:
1258                free(dst_name);
1259        }
1260        if (send_prune) {
1261                /* check for missing refs on the remote */
1262                for (ref = *dst; ref; ref = ref->next) {
1263                        char *src_name;
1264
1265                        if (ref->peer_ref)
1266                                /* We're already sending something to this ref. */
1267                                continue;
1268
1269                        src_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_DST, NULL);
1270                        if (src_name) {
1271                                if (!find_ref_by_name(src, src_name))
1272                                        ref->peer_ref = alloc_delete_ref();
1273                                free(src_name);
1274                        }
1275                }
1276        }
1277        if (errs)
1278                return -1;
1279        return 0;
1280}
1281
1282void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1283        int force_update)
1284{
1285        struct ref *ref;
1286
1287        for (ref = remote_refs; ref; ref = ref->next) {
1288                int force_ref_update = ref->force || force_update;
1289
1290                if (ref->peer_ref)
1291                        hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
1292                else if (!send_mirror)
1293                        continue;
1294
1295                ref->deletion = is_null_sha1(ref->new_sha1);
1296                if (!ref->deletion &&
1297                        !hashcmp(ref->old_sha1, ref->new_sha1)) {
1298                        ref->status = REF_STATUS_UPTODATE;
1299                        continue;
1300                }
1301
1302                /*
1303                 * Decide whether an individual refspec A:B can be
1304                 * pushed.  The push will succeed if any of the
1305                 * following are true:
1306                 *
1307                 * (1) the remote reference B does not exist
1308                 *
1309                 * (2) the remote reference B is being removed (i.e.,
1310                 *     pushing :B where no source is specified)
1311                 *
1312                 * (3) the destination is not under refs/tags/, and
1313                 *     if the old and new value is a commit, the new
1314                 *     is a descendant of the old.
1315                 *
1316                 * (4) it is forced using the +A:B notation, or by
1317                 *     passing the --force argument
1318                 */
1319
1320                if (!ref->deletion && !is_null_sha1(ref->old_sha1)) {
1321                        int why = 0; /* why would this push require --force? */
1322
1323                        if (!prefixcmp(ref->name, "refs/tags/"))
1324                                why = REF_STATUS_REJECT_ALREADY_EXISTS;
1325                        else if (!has_sha1_file(ref->old_sha1))
1326                                why = REF_STATUS_REJECT_FETCH_FIRST;
1327                        else if (!lookup_commit_reference_gently(ref->old_sha1, 1) ||
1328                                 !lookup_commit_reference_gently(ref->new_sha1, 1))
1329                                why = REF_STATUS_REJECT_NEEDS_FORCE;
1330                        else if (!ref_newer(ref->new_sha1, ref->old_sha1))
1331                                why = REF_STATUS_REJECT_NONFASTFORWARD;
1332
1333                        if (!force_ref_update)
1334                                ref->status = why;
1335                        else if (why)
1336                                ref->forced_update = 1;
1337                }
1338        }
1339}
1340
1341struct branch *branch_get(const char *name)
1342{
1343        struct branch *ret;
1344
1345        read_config();
1346        if (!name || !*name || !strcmp(name, "HEAD"))
1347                ret = current_branch;
1348        else
1349                ret = make_branch(name, 0);
1350        if (ret && ret->remote_name) {
1351                ret->remote = remote_get(ret->remote_name);
1352                if (ret->merge_nr) {
1353                        int i;
1354                        ret->merge = xcalloc(sizeof(*ret->merge),
1355                                             ret->merge_nr);
1356                        for (i = 0; i < ret->merge_nr; i++) {
1357                                ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1358                                ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1359                                if (remote_find_tracking(ret->remote, ret->merge[i])
1360                                    && !strcmp(ret->remote_name, "."))
1361                                        ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1362                        }
1363                }
1364        }
1365        return ret;
1366}
1367
1368int branch_has_merge_config(struct branch *branch)
1369{
1370        return branch && !!branch->merge;
1371}
1372
1373int branch_merge_matches(struct branch *branch,
1374                                 int i,
1375                                 const char *refname)
1376{
1377        if (!branch || i < 0 || i >= branch->merge_nr)
1378                return 0;
1379        return refname_match(branch->merge[i]->src, refname, ref_fetch_rules);
1380}
1381
1382static int ignore_symref_update(const char *refname)
1383{
1384        unsigned char sha1[20];
1385        int flag;
1386
1387        if (!resolve_ref_unsafe(refname, sha1, 0, &flag))
1388                return 0; /* non-existing refs are OK */
1389        return (flag & REF_ISSYMREF);
1390}
1391
1392static struct ref *get_expanded_map(const struct ref *remote_refs,
1393                                    const struct refspec *refspec)
1394{
1395        const struct ref *ref;
1396        struct ref *ret = NULL;
1397        struct ref **tail = &ret;
1398
1399        char *expn_name;
1400
1401        for (ref = remote_refs; ref; ref = ref->next) {
1402                if (strchr(ref->name, '^'))
1403                        continue; /* a dereference item */
1404                if (match_name_with_pattern(refspec->src, ref->name,
1405                                            refspec->dst, &expn_name) &&
1406                    !ignore_symref_update(expn_name)) {
1407                        struct ref *cpy = copy_ref(ref);
1408
1409                        cpy->peer_ref = alloc_ref(expn_name);
1410                        free(expn_name);
1411                        if (refspec->force)
1412                                cpy->peer_ref->force = 1;
1413                        *tail = cpy;
1414                        tail = &cpy->next;
1415                }
1416        }
1417
1418        return ret;
1419}
1420
1421static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1422{
1423        const struct ref *ref;
1424        for (ref = refs; ref; ref = ref->next) {
1425                if (refname_match(name, ref->name, ref_fetch_rules))
1426                        return ref;
1427        }
1428        return NULL;
1429}
1430
1431struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1432{
1433        const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1434
1435        if (!ref)
1436                return NULL;
1437
1438        return copy_ref(ref);
1439}
1440
1441static struct ref *get_local_ref(const char *name)
1442{
1443        if (!name || name[0] == '\0')
1444                return NULL;
1445
1446        if (!prefixcmp(name, "refs/"))
1447                return alloc_ref(name);
1448
1449        if (!prefixcmp(name, "heads/") ||
1450            !prefixcmp(name, "tags/") ||
1451            !prefixcmp(name, "remotes/"))
1452                return alloc_ref_with_prefix("refs/", 5, name);
1453
1454        return alloc_ref_with_prefix("refs/heads/", 11, name);
1455}
1456
1457int get_fetch_map(const struct ref *remote_refs,
1458                  const struct refspec *refspec,
1459                  struct ref ***tail,
1460                  int missing_ok)
1461{
1462        struct ref *ref_map, **rmp;
1463
1464        if (refspec->pattern) {
1465                ref_map = get_expanded_map(remote_refs, refspec);
1466        } else {
1467                const char *name = refspec->src[0] ? refspec->src : "HEAD";
1468
1469                ref_map = get_remote_ref(remote_refs, name);
1470                if (!missing_ok && !ref_map)
1471                        die("Couldn't find remote ref %s", name);
1472                if (ref_map) {
1473                        ref_map->peer_ref = get_local_ref(refspec->dst);
1474                        if (ref_map->peer_ref && refspec->force)
1475                                ref_map->peer_ref->force = 1;
1476                }
1477        }
1478
1479        for (rmp = &ref_map; *rmp; ) {
1480                if ((*rmp)->peer_ref) {
1481                        if (prefixcmp((*rmp)->peer_ref->name, "refs/") ||
1482                            check_refname_format((*rmp)->peer_ref->name, 0)) {
1483                                struct ref *ignore = *rmp;
1484                                error("* Ignoring funny ref '%s' locally",
1485                                      (*rmp)->peer_ref->name);
1486                                *rmp = (*rmp)->next;
1487                                free(ignore->peer_ref);
1488                                free(ignore);
1489                                continue;
1490                        }
1491                }
1492                rmp = &((*rmp)->next);
1493        }
1494
1495        if (ref_map)
1496                tail_link_ref(ref_map, tail);
1497
1498        return 0;
1499}
1500
1501int resolve_remote_symref(struct ref *ref, struct ref *list)
1502{
1503        if (!ref->symref)
1504                return 0;
1505        for (; list; list = list->next)
1506                if (!strcmp(ref->symref, list->name)) {
1507                        hashcpy(ref->old_sha1, list->old_sha1);
1508                        return 0;
1509                }
1510        return 1;
1511}
1512
1513static void unmark_and_free(struct commit_list *list, unsigned int mark)
1514{
1515        while (list) {
1516                struct commit_list *temp = list;
1517                temp->item->object.flags &= ~mark;
1518                list = temp->next;
1519                free(temp);
1520        }
1521}
1522
1523int ref_newer(const unsigned char *new_sha1, const unsigned char *old_sha1)
1524{
1525        struct object *o;
1526        struct commit *old, *new;
1527        struct commit_list *list, *used;
1528        int found = 0;
1529
1530        /*
1531         * Both new and old must be commit-ish and new is descendant of
1532         * old.  Otherwise we require --force.
1533         */
1534        o = deref_tag(parse_object(old_sha1), NULL, 0);
1535        if (!o || o->type != OBJ_COMMIT)
1536                return 0;
1537        old = (struct commit *) o;
1538
1539        o = deref_tag(parse_object(new_sha1), NULL, 0);
1540        if (!o || o->type != OBJ_COMMIT)
1541                return 0;
1542        new = (struct commit *) o;
1543
1544        if (parse_commit(new) < 0)
1545                return 0;
1546
1547        used = list = NULL;
1548        commit_list_insert(new, &list);
1549        while (list) {
1550                new = pop_most_recent_commit(&list, TMP_MARK);
1551                commit_list_insert(new, &used);
1552                if (new == old) {
1553                        found = 1;
1554                        break;
1555                }
1556        }
1557        unmark_and_free(list, TMP_MARK);
1558        unmark_and_free(used, TMP_MARK);
1559        return found;
1560}
1561
1562/*
1563 * Return true if there is anything to report, otherwise false.
1564 */
1565int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs)
1566{
1567        unsigned char sha1[20];
1568        struct commit *ours, *theirs;
1569        char symmetric[84];
1570        struct rev_info revs;
1571        const char *rev_argv[10], *base;
1572        int rev_argc;
1573
1574        /*
1575         * Nothing to report unless we are marked to build on top of
1576         * somebody else.
1577         */
1578        if (!branch ||
1579            !branch->merge || !branch->merge[0] || !branch->merge[0]->dst)
1580                return 0;
1581
1582        /*
1583         * If what we used to build on no longer exists, there is
1584         * nothing to report.
1585         */
1586        base = branch->merge[0]->dst;
1587        if (read_ref(base, sha1))
1588                return 0;
1589        theirs = lookup_commit_reference(sha1);
1590        if (!theirs)
1591                return 0;
1592
1593        if (read_ref(branch->refname, sha1))
1594                return 0;
1595        ours = lookup_commit_reference(sha1);
1596        if (!ours)
1597                return 0;
1598
1599        /* are we the same? */
1600        if (theirs == ours)
1601                return 0;
1602
1603        /* Run "rev-list --left-right ours...theirs" internally... */
1604        rev_argc = 0;
1605        rev_argv[rev_argc++] = NULL;
1606        rev_argv[rev_argc++] = "--left-right";
1607        rev_argv[rev_argc++] = symmetric;
1608        rev_argv[rev_argc++] = "--";
1609        rev_argv[rev_argc] = NULL;
1610
1611        strcpy(symmetric, sha1_to_hex(ours->object.sha1));
1612        strcpy(symmetric + 40, "...");
1613        strcpy(symmetric + 43, sha1_to_hex(theirs->object.sha1));
1614
1615        init_revisions(&revs, NULL);
1616        setup_revisions(rev_argc, rev_argv, &revs, NULL);
1617        prepare_revision_walk(&revs);
1618
1619        /* ... and count the commits on each side. */
1620        *num_ours = 0;
1621        *num_theirs = 0;
1622        while (1) {
1623                struct commit *c = get_revision(&revs);
1624                if (!c)
1625                        break;
1626                if (c->object.flags & SYMMETRIC_LEFT)
1627                        (*num_ours)++;
1628                else
1629                        (*num_theirs)++;
1630        }
1631
1632        /* clear object flags smudged by the above traversal */
1633        clear_commit_marks(ours, ALL_REV_FLAGS);
1634        clear_commit_marks(theirs, ALL_REV_FLAGS);
1635        return 1;
1636}
1637
1638/*
1639 * Return true when there is anything to report, otherwise false.
1640 */
1641int format_tracking_info(struct branch *branch, struct strbuf *sb)
1642{
1643        int num_ours, num_theirs;
1644        const char *base;
1645
1646        if (!stat_tracking_info(branch, &num_ours, &num_theirs))
1647                return 0;
1648
1649        base = branch->merge[0]->dst;
1650        base = shorten_unambiguous_ref(base, 0);
1651        if (!num_theirs) {
1652                strbuf_addf(sb,
1653                        Q_("Your branch is ahead of '%s' by %d commit.\n",
1654                           "Your branch is ahead of '%s' by %d commits.\n",
1655                           num_ours),
1656                        base, num_ours);
1657                if (advice_status_hints)
1658                        strbuf_addf(sb,
1659                                _("  (use \"git push\" to publish your local commits)\n"));
1660        } else if (!num_ours) {
1661                strbuf_addf(sb,
1662                        Q_("Your branch is behind '%s' by %d commit, "
1663                               "and can be fast-forwarded.\n",
1664                           "Your branch is behind '%s' by %d commits, "
1665                               "and can be fast-forwarded.\n",
1666                           num_theirs),
1667                        base, num_theirs);
1668                if (advice_status_hints)
1669                        strbuf_addf(sb,
1670                                _("  (use \"git pull\" to update your local branch)\n"));
1671        } else {
1672                strbuf_addf(sb,
1673                        Q_("Your branch and '%s' have diverged,\n"
1674                               "and have %d and %d different commit each, "
1675                               "respectively.\n",
1676                           "Your branch and '%s' have diverged,\n"
1677                               "and have %d and %d different commits each, "
1678                               "respectively.\n",
1679                           num_theirs),
1680                        base, num_ours, num_theirs);
1681                if (advice_status_hints)
1682                        strbuf_addf(sb,
1683                                _("  (use \"git pull\" to merge the remote branch into yours)\n"));
1684        }
1685        return 1;
1686}
1687
1688static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
1689{
1690        struct ref ***local_tail = cb_data;
1691        struct ref *ref;
1692        int len;
1693
1694        /* we already know it starts with refs/ to get here */
1695        if (check_refname_format(refname + 5, 0))
1696                return 0;
1697
1698        len = strlen(refname) + 1;
1699        ref = xcalloc(1, sizeof(*ref) + len);
1700        hashcpy(ref->new_sha1, sha1);
1701        memcpy(ref->name, refname, len);
1702        **local_tail = ref;
1703        *local_tail = &ref->next;
1704        return 0;
1705}
1706
1707struct ref *get_local_heads(void)
1708{
1709        struct ref *local_refs = NULL, **local_tail = &local_refs;
1710        for_each_ref(one_local_ref, &local_tail);
1711        return local_refs;
1712}
1713
1714struct ref *guess_remote_head(const struct ref *head,
1715                              const struct ref *refs,
1716                              int all)
1717{
1718        const struct ref *r;
1719        struct ref *list = NULL;
1720        struct ref **tail = &list;
1721
1722        if (!head)
1723                return NULL;
1724
1725        /*
1726         * Some transports support directly peeking at
1727         * where HEAD points; if that is the case, then
1728         * we don't have to guess.
1729         */
1730        if (head->symref)
1731                return copy_ref(find_ref_by_name(refs, head->symref));
1732
1733        /* If refs/heads/master could be right, it is. */
1734        if (!all) {
1735                r = find_ref_by_name(refs, "refs/heads/master");
1736                if (r && !hashcmp(r->old_sha1, head->old_sha1))
1737                        return copy_ref(r);
1738        }
1739
1740        /* Look for another ref that points there */
1741        for (r = refs; r; r = r->next) {
1742                if (r != head &&
1743                    !prefixcmp(r->name, "refs/heads/") &&
1744                    !hashcmp(r->old_sha1, head->old_sha1)) {
1745                        *tail = copy_ref(r);
1746                        tail = &((*tail)->next);
1747                        if (!all)
1748                                break;
1749                }
1750        }
1751
1752        return list;
1753}
1754
1755struct stale_heads_info {
1756        struct string_list *ref_names;
1757        struct ref **stale_refs_tail;
1758        struct refspec *refs;
1759        int ref_count;
1760};
1761
1762static int get_stale_heads_cb(const char *refname,
1763        const unsigned char *sha1, int flags, void *cb_data)
1764{
1765        struct stale_heads_info *info = cb_data;
1766        struct refspec query;
1767        memset(&query, 0, sizeof(struct refspec));
1768        query.dst = (char *)refname;
1769
1770        if (query_refspecs(info->refs, info->ref_count, &query))
1771                return 0; /* No matches */
1772
1773        /*
1774         * If we did find a suitable refspec and it's not a symref and
1775         * it's not in the list of refs that currently exist in that
1776         * remote we consider it to be stale.
1777         */
1778        if (!((flags & REF_ISSYMREF) ||
1779              string_list_has_string(info->ref_names, query.src))) {
1780                struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
1781                hashcpy(ref->new_sha1, sha1);
1782        }
1783
1784        free(query.src);
1785        return 0;
1786}
1787
1788struct ref *get_stale_heads(struct refspec *refs, int ref_count, struct ref *fetch_map)
1789{
1790        struct ref *ref, *stale_refs = NULL;
1791        struct string_list ref_names = STRING_LIST_INIT_NODUP;
1792        struct stale_heads_info info;
1793        info.ref_names = &ref_names;
1794        info.stale_refs_tail = &stale_refs;
1795        info.refs = refs;
1796        info.ref_count = ref_count;
1797        for (ref = fetch_map; ref; ref = ref->next)
1798                string_list_append(&ref_names, ref->name);
1799        sort_string_list(&ref_names);
1800        for_each_ref(get_stale_heads_cb, &info);
1801        string_list_clear(&ref_names, 0);
1802        return stale_refs;
1803}