remote.con commit Merge branch 'va/mailinfo-doc-typofix' (5bfc50d)
   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#include "argv-array.h"
  12
  13enum map_direction { FROM_SRC, FROM_DST };
  14
  15static struct refspec s_tag_refspec = {
  16        0,
  17        1,
  18        0,
  19        0,
  20        "refs/tags/*",
  21        "refs/tags/*"
  22};
  23
  24const struct refspec *tag_refspec = &s_tag_refspec;
  25
  26struct counted_string {
  27        size_t len;
  28        const char *s;
  29};
  30struct rewrite {
  31        const char *base;
  32        size_t baselen;
  33        struct counted_string *instead_of;
  34        int instead_of_nr;
  35        int instead_of_alloc;
  36};
  37struct rewrites {
  38        struct rewrite **rewrite;
  39        int rewrite_alloc;
  40        int rewrite_nr;
  41};
  42
  43static struct remote **remotes;
  44static int remotes_alloc;
  45static int remotes_nr;
  46static struct hashmap remotes_hash;
  47
  48static struct branch **branches;
  49static int branches_alloc;
  50static int branches_nr;
  51
  52static struct branch *current_branch;
  53static const char *pushremote_name;
  54
  55static struct rewrites rewrites;
  56static struct rewrites rewrites_push;
  57
  58static int valid_remote(const struct remote *remote)
  59{
  60        return (!!remote->url) || (!!remote->foreign_vcs);
  61}
  62
  63static const char *alias_url(const char *url, struct rewrites *r)
  64{
  65        int i, j;
  66        struct counted_string *longest;
  67        int longest_i;
  68
  69        longest = NULL;
  70        longest_i = -1;
  71        for (i = 0; i < r->rewrite_nr; i++) {
  72                if (!r->rewrite[i])
  73                        continue;
  74                for (j = 0; j < r->rewrite[i]->instead_of_nr; j++) {
  75                        if (starts_with(url, r->rewrite[i]->instead_of[j].s) &&
  76                            (!longest ||
  77                             longest->len < r->rewrite[i]->instead_of[j].len)) {
  78                                longest = &(r->rewrite[i]->instead_of[j]);
  79                                longest_i = i;
  80                        }
  81                }
  82        }
  83        if (!longest)
  84                return url;
  85
  86        return xstrfmt("%s%s", r->rewrite[longest_i]->base, url + longest->len);
  87}
  88
  89static void add_push_refspec(struct remote *remote, const char *ref)
  90{
  91        ALLOC_GROW(remote->push_refspec,
  92                   remote->push_refspec_nr + 1,
  93                   remote->push_refspec_alloc);
  94        remote->push_refspec[remote->push_refspec_nr++] = ref;
  95}
  96
  97static void add_fetch_refspec(struct remote *remote, const char *ref)
  98{
  99        ALLOC_GROW(remote->fetch_refspec,
 100                   remote->fetch_refspec_nr + 1,
 101                   remote->fetch_refspec_alloc);
 102        remote->fetch_refspec[remote->fetch_refspec_nr++] = ref;
 103}
 104
 105static void add_url(struct remote *remote, const char *url)
 106{
 107        ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
 108        remote->url[remote->url_nr++] = url;
 109}
 110
 111static void add_pushurl(struct remote *remote, const char *pushurl)
 112{
 113        ALLOC_GROW(remote->pushurl, remote->pushurl_nr + 1, remote->pushurl_alloc);
 114        remote->pushurl[remote->pushurl_nr++] = pushurl;
 115}
 116
 117static void add_pushurl_alias(struct remote *remote, const char *url)
 118{
 119        const char *pushurl = alias_url(url, &rewrites_push);
 120        if (pushurl != url)
 121                add_pushurl(remote, pushurl);
 122}
 123
 124static void add_url_alias(struct remote *remote, const char *url)
 125{
 126        add_url(remote, alias_url(url, &rewrites));
 127        add_pushurl_alias(remote, url);
 128}
 129
 130struct remotes_hash_key {
 131        const char *str;
 132        int len;
 133};
 134
 135static int remotes_hash_cmp(const struct remote *a, const struct remote *b, const struct remotes_hash_key *key)
 136{
 137        if (key)
 138                return strncmp(a->name, key->str, key->len) || a->name[key->len];
 139        else
 140                return strcmp(a->name, b->name);
 141}
 142
 143static inline void init_remotes_hash(void)
 144{
 145        if (!remotes_hash.cmpfn)
 146                hashmap_init(&remotes_hash, (hashmap_cmp_fn)remotes_hash_cmp, 0);
 147}
 148
 149static struct remote *make_remote(const char *name, int len)
 150{
 151        struct remote *ret, *replaced;
 152        struct remotes_hash_key lookup;
 153        struct hashmap_entry lookup_entry;
 154
 155        if (!len)
 156                len = strlen(name);
 157
 158        init_remotes_hash();
 159        lookup.str = name;
 160        lookup.len = len;
 161        hashmap_entry_init(&lookup_entry, memhash(name, len));
 162
 163        if ((ret = hashmap_get(&remotes_hash, &lookup_entry, &lookup)) != NULL)
 164                return ret;
 165
 166        ret = xcalloc(1, sizeof(struct remote));
 167        ret->prune = -1;  /* unspecified */
 168        ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
 169        remotes[remotes_nr++] = ret;
 170        ret->name = xstrndup(name, len);
 171
 172        hashmap_entry_init(ret, lookup_entry.hash);
 173        replaced = hashmap_put(&remotes_hash, ret);
 174        assert(replaced == NULL);  /* no previous entry overwritten */
 175        return ret;
 176}
 177
 178static void add_merge(struct branch *branch, const char *name)
 179{
 180        ALLOC_GROW(branch->merge_name, branch->merge_nr + 1,
 181                   branch->merge_alloc);
 182        branch->merge_name[branch->merge_nr++] = name;
 183}
 184
 185static struct branch *make_branch(const char *name, int len)
 186{
 187        struct branch *ret;
 188        int i;
 189
 190        for (i = 0; i < branches_nr; i++) {
 191                if (len ? (!strncmp(name, branches[i]->name, len) &&
 192                           !branches[i]->name[len]) :
 193                    !strcmp(name, branches[i]->name))
 194                        return branches[i];
 195        }
 196
 197        ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
 198        ret = xcalloc(1, sizeof(struct branch));
 199        branches[branches_nr++] = ret;
 200        if (len)
 201                ret->name = xstrndup(name, len);
 202        else
 203                ret->name = xstrdup(name);
 204        ret->refname = xstrfmt("refs/heads/%s", ret->name);
 205
 206        return ret;
 207}
 208
 209static struct rewrite *make_rewrite(struct rewrites *r, const char *base, int len)
 210{
 211        struct rewrite *ret;
 212        int i;
 213
 214        for (i = 0; i < r->rewrite_nr; i++) {
 215                if (len
 216                    ? (len == r->rewrite[i]->baselen &&
 217                       !strncmp(base, r->rewrite[i]->base, len))
 218                    : !strcmp(base, r->rewrite[i]->base))
 219                        return r->rewrite[i];
 220        }
 221
 222        ALLOC_GROW(r->rewrite, r->rewrite_nr + 1, r->rewrite_alloc);
 223        ret = xcalloc(1, sizeof(struct rewrite));
 224        r->rewrite[r->rewrite_nr++] = ret;
 225        if (len) {
 226                ret->base = xstrndup(base, len);
 227                ret->baselen = len;
 228        }
 229        else {
 230                ret->base = xstrdup(base);
 231                ret->baselen = strlen(base);
 232        }
 233        return ret;
 234}
 235
 236static void add_instead_of(struct rewrite *rewrite, const char *instead_of)
 237{
 238        ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
 239        rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
 240        rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
 241        rewrite->instead_of_nr++;
 242}
 243
 244static const char *skip_spaces(const char *s)
 245{
 246        while (isspace(*s))
 247                s++;
 248        return s;
 249}
 250
 251static void read_remotes_file(struct remote *remote)
 252{
 253        struct strbuf buf = STRBUF_INIT;
 254        FILE *f = fopen(git_path("remotes/%s", remote->name), "r");
 255
 256        if (!f)
 257                return;
 258        remote->origin = REMOTE_REMOTES;
 259        while (strbuf_getline(&buf, f) != EOF) {
 260                const char *v;
 261
 262                strbuf_rtrim(&buf);
 263
 264                if (skip_prefix(buf.buf, "URL:", &v))
 265                        add_url_alias(remote, xstrdup(skip_spaces(v)));
 266                else if (skip_prefix(buf.buf, "Push:", &v))
 267                        add_push_refspec(remote, xstrdup(skip_spaces(v)));
 268                else if (skip_prefix(buf.buf, "Pull:", &v))
 269                        add_fetch_refspec(remote, xstrdup(skip_spaces(v)));
 270        }
 271        strbuf_release(&buf);
 272        fclose(f);
 273}
 274
 275static void read_branches_file(struct remote *remote)
 276{
 277        char *frag;
 278        struct strbuf buf = STRBUF_INIT;
 279        FILE *f = fopen(git_path("branches/%s", remote->name), "r");
 280
 281        if (!f)
 282                return;
 283
 284        strbuf_getline_lf(&buf, f);
 285        fclose(f);
 286        strbuf_trim(&buf);
 287        if (!buf.len) {
 288                strbuf_release(&buf);
 289                return;
 290        }
 291
 292        remote->origin = REMOTE_BRANCHES;
 293
 294        /*
 295         * The branches file would have URL and optionally
 296         * #branch specified.  The "master" (or specified) branch is
 297         * fetched and stored in the local branch matching the
 298         * remote name.
 299         */
 300        frag = strchr(buf.buf, '#');
 301        if (frag)
 302                *(frag++) = '\0';
 303        else
 304                frag = "master";
 305
 306        add_url_alias(remote, strbuf_detach(&buf, NULL));
 307        add_fetch_refspec(remote, xstrfmt("refs/heads/%s:refs/heads/%s",
 308                                          frag, remote->name));
 309
 310        /*
 311         * Cogito compatible push: push current HEAD to remote #branch
 312         * (master if missing)
 313         */
 314        add_push_refspec(remote, xstrfmt("HEAD:refs/heads/%s", frag));
 315        remote->fetch_tags = 1; /* always auto-follow */
 316}
 317
 318static int handle_config(const char *key, const char *value, void *cb)
 319{
 320        const char *name;
 321        int namelen;
 322        const char *subkey;
 323        struct remote *remote;
 324        struct branch *branch;
 325        if (parse_config_key(key, "branch", &name, &namelen, &subkey) >= 0) {
 326                if (!name)
 327                        return 0;
 328                branch = make_branch(name, namelen);
 329                if (!strcmp(subkey, "remote")) {
 330                        return git_config_string(&branch->remote_name, key, value);
 331                } else if (!strcmp(subkey, "pushremote")) {
 332                        return git_config_string(&branch->pushremote_name, key, value);
 333                } else if (!strcmp(subkey, "merge")) {
 334                        if (!value)
 335                                return config_error_nonbool(key);
 336                        add_merge(branch, xstrdup(value));
 337                }
 338                return 0;
 339        }
 340        if (parse_config_key(key, "url", &name, &namelen, &subkey) >= 0) {
 341                struct rewrite *rewrite;
 342                if (!name)
 343                        return 0;
 344                if (!strcmp(subkey, "insteadof")) {
 345                        rewrite = make_rewrite(&rewrites, name, namelen);
 346                        if (!value)
 347                                return config_error_nonbool(key);
 348                        add_instead_of(rewrite, xstrdup(value));
 349                } else if (!strcmp(subkey, "pushinsteadof")) {
 350                        rewrite = make_rewrite(&rewrites_push, name, namelen);
 351                        if (!value)
 352                                return config_error_nonbool(key);
 353                        add_instead_of(rewrite, xstrdup(value));
 354                }
 355        }
 356
 357        if (parse_config_key(key, "remote", &name, &namelen, &subkey) < 0)
 358                return 0;
 359
 360        /* Handle remote.* variables */
 361        if (!name && !strcmp(subkey, "pushdefault"))
 362                return git_config_string(&pushremote_name, key, value);
 363
 364        if (!name)
 365                return 0;
 366        /* Handle remote.<name>.* variables */
 367        if (*name == '/') {
 368                warning("Config remote shorthand cannot begin with '/': %s",
 369                        name);
 370                return 0;
 371        }
 372        remote = make_remote(name, namelen);
 373        remote->origin = REMOTE_CONFIG;
 374        if (!strcmp(subkey, "mirror"))
 375                remote->mirror = git_config_bool(key, value);
 376        else if (!strcmp(subkey, "skipdefaultupdate"))
 377                remote->skip_default_update = git_config_bool(key, value);
 378        else if (!strcmp(subkey, "skipfetchall"))
 379                remote->skip_default_update = git_config_bool(key, value);
 380        else if (!strcmp(subkey, "prune"))
 381                remote->prune = git_config_bool(key, value);
 382        else if (!strcmp(subkey, "url")) {
 383                const char *v;
 384                if (git_config_string(&v, key, value))
 385                        return -1;
 386                add_url(remote, v);
 387        } else if (!strcmp(subkey, "pushurl")) {
 388                const char *v;
 389                if (git_config_string(&v, key, value))
 390                        return -1;
 391                add_pushurl(remote, v);
 392        } else if (!strcmp(subkey, "push")) {
 393                const char *v;
 394                if (git_config_string(&v, key, value))
 395                        return -1;
 396                add_push_refspec(remote, v);
 397        } else if (!strcmp(subkey, "fetch")) {
 398                const char *v;
 399                if (git_config_string(&v, key, value))
 400                        return -1;
 401                add_fetch_refspec(remote, v);
 402        } else if (!strcmp(subkey, "receivepack")) {
 403                const char *v;
 404                if (git_config_string(&v, key, value))
 405                        return -1;
 406                if (!remote->receivepack)
 407                        remote->receivepack = v;
 408                else
 409                        error("more than one receivepack given, using the first");
 410        } else if (!strcmp(subkey, "uploadpack")) {
 411                const char *v;
 412                if (git_config_string(&v, key, value))
 413                        return -1;
 414                if (!remote->uploadpack)
 415                        remote->uploadpack = v;
 416                else
 417                        error("more than one uploadpack given, using the first");
 418        } else if (!strcmp(subkey, "tagopt")) {
 419                if (!strcmp(value, "--no-tags"))
 420                        remote->fetch_tags = -1;
 421                else if (!strcmp(value, "--tags"))
 422                        remote->fetch_tags = 2;
 423        } else if (!strcmp(subkey, "proxy")) {
 424                return git_config_string((const char **)&remote->http_proxy,
 425                                         key, value);
 426        } else if (!strcmp(subkey, "proxyauthmethod")) {
 427                return git_config_string((const char **)&remote->http_proxy_authmethod,
 428                                         key, value);
 429        } else if (!strcmp(subkey, "vcs")) {
 430                return git_config_string(&remote->foreign_vcs, key, value);
 431        }
 432        return 0;
 433}
 434
 435static void alias_all_urls(void)
 436{
 437        int i, j;
 438        for (i = 0; i < remotes_nr; i++) {
 439                int add_pushurl_aliases;
 440                if (!remotes[i])
 441                        continue;
 442                for (j = 0; j < remotes[i]->pushurl_nr; j++) {
 443                        remotes[i]->pushurl[j] = alias_url(remotes[i]->pushurl[j], &rewrites);
 444                }
 445                add_pushurl_aliases = remotes[i]->pushurl_nr == 0;
 446                for (j = 0; j < remotes[i]->url_nr; j++) {
 447                        if (add_pushurl_aliases)
 448                                add_pushurl_alias(remotes[i], remotes[i]->url[j]);
 449                        remotes[i]->url[j] = alias_url(remotes[i]->url[j], &rewrites);
 450                }
 451        }
 452}
 453
 454static void read_config(void)
 455{
 456        static int loaded;
 457        struct object_id oid;
 458        int flag;
 459
 460        if (loaded)
 461                return;
 462        loaded = 1;
 463
 464        current_branch = NULL;
 465        if (startup_info->have_repository) {
 466                const char *head_ref = resolve_ref_unsafe("HEAD", 0, oid.hash, &flag);
 467                if (head_ref && (flag & REF_ISSYMREF) &&
 468                    skip_prefix(head_ref, "refs/heads/", &head_ref)) {
 469                        current_branch = make_branch(head_ref, 0);
 470                }
 471        }
 472        git_config(handle_config, NULL);
 473        alias_all_urls();
 474}
 475
 476/*
 477 * This function frees a refspec array.
 478 * Warning: code paths should be checked to ensure that the src
 479 *          and dst pointers are always freeable pointers as well
 480 *          as the refspec pointer itself.
 481 */
 482static void free_refspecs(struct refspec *refspec, int nr_refspec)
 483{
 484        int i;
 485
 486        if (!refspec)
 487                return;
 488
 489        for (i = 0; i < nr_refspec; i++) {
 490                free(refspec[i].src);
 491                free(refspec[i].dst);
 492        }
 493        free(refspec);
 494}
 495
 496static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
 497{
 498        int i;
 499        struct refspec *rs = xcalloc(nr_refspec, sizeof(*rs));
 500
 501        for (i = 0; i < nr_refspec; i++) {
 502                size_t llen;
 503                int is_glob;
 504                const char *lhs, *rhs;
 505                int flags;
 506
 507                is_glob = 0;
 508
 509                lhs = refspec[i];
 510                if (*lhs == '+') {
 511                        rs[i].force = 1;
 512                        lhs++;
 513                }
 514
 515                rhs = strrchr(lhs, ':');
 516
 517                /*
 518                 * Before going on, special case ":" (or "+:") as a refspec
 519                 * for pushing matching refs.
 520                 */
 521                if (!fetch && rhs == lhs && rhs[1] == '\0') {
 522                        rs[i].matching = 1;
 523                        continue;
 524                }
 525
 526                if (rhs) {
 527                        size_t rlen = strlen(++rhs);
 528                        is_glob = (1 <= rlen && strchr(rhs, '*'));
 529                        rs[i].dst = xstrndup(rhs, rlen);
 530                }
 531
 532                llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
 533                if (1 <= llen && memchr(lhs, '*', llen)) {
 534                        if ((rhs && !is_glob) || (!rhs && fetch))
 535                                goto invalid;
 536                        is_glob = 1;
 537                } else if (rhs && is_glob) {
 538                        goto invalid;
 539                }
 540
 541                rs[i].pattern = is_glob;
 542                rs[i].src = xstrndup(lhs, llen);
 543                flags = REFNAME_ALLOW_ONELEVEL | (is_glob ? REFNAME_REFSPEC_PATTERN : 0);
 544
 545                if (fetch) {
 546                        struct object_id unused;
 547
 548                        /* LHS */
 549                        if (!*rs[i].src)
 550                                ; /* empty is ok; it means "HEAD" */
 551                        else if (llen == GIT_SHA1_HEXSZ && !get_oid_hex(rs[i].src, &unused))
 552                                rs[i].exact_sha1 = 1; /* ok */
 553                        else if (!check_refname_format(rs[i].src, flags))
 554                                ; /* valid looking ref is ok */
 555                        else
 556                                goto invalid;
 557                        /* RHS */
 558                        if (!rs[i].dst)
 559                                ; /* missing is ok; it is the same as empty */
 560                        else if (!*rs[i].dst)
 561                                ; /* empty is ok; it means "do not store" */
 562                        else if (!check_refname_format(rs[i].dst, flags))
 563                                ; /* valid looking ref is ok */
 564                        else
 565                                goto invalid;
 566                } else {
 567                        /*
 568                         * LHS
 569                         * - empty is allowed; it means delete.
 570                         * - when wildcarded, it must be a valid looking ref.
 571                         * - otherwise, it must be an extended SHA-1, but
 572                         *   there is no existing way to validate this.
 573                         */
 574                        if (!*rs[i].src)
 575                                ; /* empty is ok */
 576                        else if (is_glob) {
 577                                if (check_refname_format(rs[i].src, flags))
 578                                        goto invalid;
 579                        }
 580                        else
 581                                ; /* anything goes, for now */
 582                        /*
 583                         * RHS
 584                         * - missing is allowed, but LHS then must be a
 585                         *   valid looking ref.
 586                         * - empty is not allowed.
 587                         * - otherwise it must be a valid looking ref.
 588                         */
 589                        if (!rs[i].dst) {
 590                                if (check_refname_format(rs[i].src, flags))
 591                                        goto invalid;
 592                        } else if (!*rs[i].dst) {
 593                                goto invalid;
 594                        } else {
 595                                if (check_refname_format(rs[i].dst, flags))
 596                                        goto invalid;
 597                        }
 598                }
 599        }
 600        return rs;
 601
 602 invalid:
 603        if (verify) {
 604                /*
 605                 * nr_refspec must be greater than zero and i must be valid
 606                 * since it is only possible to reach this point from within
 607                 * the for loop above.
 608                 */
 609                free_refspecs(rs, i+1);
 610                return NULL;
 611        }
 612        die("Invalid refspec '%s'", refspec[i]);
 613}
 614
 615int valid_fetch_refspec(const char *fetch_refspec_str)
 616{
 617        struct refspec *refspec;
 618
 619        refspec = parse_refspec_internal(1, &fetch_refspec_str, 1, 1);
 620        free_refspecs(refspec, 1);
 621        return !!refspec;
 622}
 623
 624struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec)
 625{
 626        return parse_refspec_internal(nr_refspec, refspec, 1, 0);
 627}
 628
 629static struct refspec *parse_push_refspec(int nr_refspec, const char **refspec)
 630{
 631        return parse_refspec_internal(nr_refspec, refspec, 0, 0);
 632}
 633
 634void free_refspec(int nr_refspec, struct refspec *refspec)
 635{
 636        int i;
 637        for (i = 0; i < nr_refspec; i++) {
 638                free(refspec[i].src);
 639                free(refspec[i].dst);
 640        }
 641        free(refspec);
 642}
 643
 644static int valid_remote_nick(const char *name)
 645{
 646        if (!name[0] || is_dot_or_dotdot(name))
 647                return 0;
 648        return !strchr(name, '/'); /* no slash */
 649}
 650
 651const char *remote_for_branch(struct branch *branch, int *explicit)
 652{
 653        if (branch && branch->remote_name) {
 654                if (explicit)
 655                        *explicit = 1;
 656                return branch->remote_name;
 657        }
 658        if (explicit)
 659                *explicit = 0;
 660        return "origin";
 661}
 662
 663const char *pushremote_for_branch(struct branch *branch, int *explicit)
 664{
 665        if (branch && branch->pushremote_name) {
 666                if (explicit)
 667                        *explicit = 1;
 668                return branch->pushremote_name;
 669        }
 670        if (pushremote_name) {
 671                if (explicit)
 672                        *explicit = 1;
 673                return pushremote_name;
 674        }
 675        return remote_for_branch(branch, explicit);
 676}
 677
 678static struct remote *remote_get_1(const char *name,
 679                                   const char *(*get_default)(struct branch *, int *))
 680{
 681        struct remote *ret;
 682        int name_given = 0;
 683
 684        read_config();
 685
 686        if (name)
 687                name_given = 1;
 688        else
 689                name = get_default(current_branch, &name_given);
 690
 691        ret = make_remote(name, 0);
 692        if (valid_remote_nick(name)) {
 693                if (!valid_remote(ret))
 694                        read_remotes_file(ret);
 695                if (!valid_remote(ret))
 696                        read_branches_file(ret);
 697        }
 698        if (name_given && !valid_remote(ret))
 699                add_url_alias(ret, name);
 700        if (!valid_remote(ret))
 701                return NULL;
 702        ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
 703        ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
 704        return ret;
 705}
 706
 707struct remote *remote_get(const char *name)
 708{
 709        return remote_get_1(name, remote_for_branch);
 710}
 711
 712struct remote *pushremote_get(const char *name)
 713{
 714        return remote_get_1(name, pushremote_for_branch);
 715}
 716
 717int remote_is_configured(struct remote *remote)
 718{
 719        return remote && remote->origin;
 720}
 721
 722int for_each_remote(each_remote_fn fn, void *priv)
 723{
 724        int i, result = 0;
 725        read_config();
 726        for (i = 0; i < remotes_nr && !result; i++) {
 727                struct remote *r = remotes[i];
 728                if (!r)
 729                        continue;
 730                if (!r->fetch)
 731                        r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
 732                                                       r->fetch_refspec);
 733                if (!r->push)
 734                        r->push = parse_push_refspec(r->push_refspec_nr,
 735                                                     r->push_refspec);
 736                result = fn(r, priv);
 737        }
 738        return result;
 739}
 740
 741static void handle_duplicate(struct ref *ref1, struct ref *ref2)
 742{
 743        if (strcmp(ref1->name, ref2->name)) {
 744                if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
 745                    ref2->fetch_head_status != FETCH_HEAD_IGNORE) {
 746                        die(_("Cannot fetch both %s and %s to %s"),
 747                            ref1->name, ref2->name, ref2->peer_ref->name);
 748                } else if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
 749                           ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
 750                        warning(_("%s usually tracks %s, not %s"),
 751                                ref2->peer_ref->name, ref2->name, ref1->name);
 752                } else if (ref1->fetch_head_status == FETCH_HEAD_IGNORE &&
 753                           ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
 754                        die(_("%s tracks both %s and %s"),
 755                            ref2->peer_ref->name, ref1->name, ref2->name);
 756                } else {
 757                        /*
 758                         * This last possibility doesn't occur because
 759                         * FETCH_HEAD_IGNORE entries always appear at
 760                         * the end of the list.
 761                         */
 762                        die(_("Internal error"));
 763                }
 764        }
 765        free(ref2->peer_ref);
 766        free(ref2);
 767}
 768
 769struct ref *ref_remove_duplicates(struct ref *ref_map)
 770{
 771        struct string_list refs = STRING_LIST_INIT_NODUP;
 772        struct ref *retval = NULL;
 773        struct ref **p = &retval;
 774
 775        while (ref_map) {
 776                struct ref *ref = ref_map;
 777
 778                ref_map = ref_map->next;
 779                ref->next = NULL;
 780
 781                if (!ref->peer_ref) {
 782                        *p = ref;
 783                        p = &ref->next;
 784                } else {
 785                        struct string_list_item *item =
 786                                string_list_insert(&refs, ref->peer_ref->name);
 787
 788                        if (item->util) {
 789                                /* Entry already existed */
 790                                handle_duplicate((struct ref *)item->util, ref);
 791                        } else {
 792                                *p = ref;
 793                                p = &ref->next;
 794                                item->util = ref;
 795                        }
 796                }
 797        }
 798
 799        string_list_clear(&refs, 0);
 800        return retval;
 801}
 802
 803int remote_has_url(struct remote *remote, const char *url)
 804{
 805        int i;
 806        for (i = 0; i < remote->url_nr; i++) {
 807                if (!strcmp(remote->url[i], url))
 808                        return 1;
 809        }
 810        return 0;
 811}
 812
 813static int match_name_with_pattern(const char *key, const char *name,
 814                                   const char *value, char **result)
 815{
 816        const char *kstar = strchr(key, '*');
 817        size_t klen;
 818        size_t ksuffixlen;
 819        size_t namelen;
 820        int ret;
 821        if (!kstar)
 822                die("Key '%s' of pattern had no '*'", key);
 823        klen = kstar - key;
 824        ksuffixlen = strlen(kstar + 1);
 825        namelen = strlen(name);
 826        ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
 827                !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
 828        if (ret && value) {
 829                struct strbuf sb = STRBUF_INIT;
 830                const char *vstar = strchr(value, '*');
 831                if (!vstar)
 832                        die("Value '%s' of pattern has no '*'", value);
 833                strbuf_add(&sb, value, vstar - value);
 834                strbuf_add(&sb, name + klen, namelen - klen - ksuffixlen);
 835                strbuf_addstr(&sb, vstar + 1);
 836                *result = strbuf_detach(&sb, NULL);
 837        }
 838        return ret;
 839}
 840
 841static void query_refspecs_multiple(struct refspec *refs, int ref_count, struct refspec *query, struct string_list *results)
 842{
 843        int i;
 844        int find_src = !query->src;
 845
 846        if (find_src && !query->dst)
 847                error("query_refspecs_multiple: need either src or dst");
 848
 849        for (i = 0; i < ref_count; i++) {
 850                struct refspec *refspec = &refs[i];
 851                const char *key = find_src ? refspec->dst : refspec->src;
 852                const char *value = find_src ? refspec->src : refspec->dst;
 853                const char *needle = find_src ? query->dst : query->src;
 854                char **result = find_src ? &query->src : &query->dst;
 855
 856                if (!refspec->dst)
 857                        continue;
 858                if (refspec->pattern) {
 859                        if (match_name_with_pattern(key, needle, value, result))
 860                                string_list_append_nodup(results, *result);
 861                } else if (!strcmp(needle, key)) {
 862                        string_list_append(results, value);
 863                }
 864        }
 865}
 866
 867int query_refspecs(struct refspec *refs, int ref_count, struct refspec *query)
 868{
 869        int i;
 870        int find_src = !query->src;
 871        const char *needle = find_src ? query->dst : query->src;
 872        char **result = find_src ? &query->src : &query->dst;
 873
 874        if (find_src && !query->dst)
 875                return error("query_refspecs: need either src or dst");
 876
 877        for (i = 0; i < ref_count; i++) {
 878                struct refspec *refspec = &refs[i];
 879                const char *key = find_src ? refspec->dst : refspec->src;
 880                const char *value = find_src ? refspec->src : refspec->dst;
 881
 882                if (!refspec->dst)
 883                        continue;
 884                if (refspec->pattern) {
 885                        if (match_name_with_pattern(key, needle, value, result)) {
 886                                query->force = refspec->force;
 887                                return 0;
 888                        }
 889                } else if (!strcmp(needle, key)) {
 890                        *result = xstrdup(value);
 891                        query->force = refspec->force;
 892                        return 0;
 893                }
 894        }
 895        return -1;
 896}
 897
 898char *apply_refspecs(struct refspec *refspecs, int nr_refspec,
 899                     const char *name)
 900{
 901        struct refspec query;
 902
 903        memset(&query, 0, sizeof(struct refspec));
 904        query.src = (char *)name;
 905
 906        if (query_refspecs(refspecs, nr_refspec, &query))
 907                return NULL;
 908
 909        return query.dst;
 910}
 911
 912int remote_find_tracking(struct remote *remote, struct refspec *refspec)
 913{
 914        return query_refspecs(remote->fetch, remote->fetch_refspec_nr, refspec);
 915}
 916
 917static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
 918                const char *name)
 919{
 920        size_t len = strlen(name);
 921        struct ref *ref = xcalloc(1, st_add4(sizeof(*ref), prefixlen, len, 1));
 922        memcpy(ref->name, prefix, prefixlen);
 923        memcpy(ref->name + prefixlen, name, len);
 924        return ref;
 925}
 926
 927struct ref *alloc_ref(const char *name)
 928{
 929        return alloc_ref_with_prefix("", 0, name);
 930}
 931
 932struct ref *copy_ref(const struct ref *ref)
 933{
 934        struct ref *cpy;
 935        size_t len;
 936        if (!ref)
 937                return NULL;
 938        len = st_add3(sizeof(struct ref), strlen(ref->name), 1);
 939        cpy = xmalloc(len);
 940        memcpy(cpy, ref, len);
 941        cpy->next = NULL;
 942        cpy->symref = xstrdup_or_null(ref->symref);
 943        cpy->remote_status = xstrdup_or_null(ref->remote_status);
 944        cpy->peer_ref = copy_ref(ref->peer_ref);
 945        return cpy;
 946}
 947
 948struct ref *copy_ref_list(const struct ref *ref)
 949{
 950        struct ref *ret = NULL;
 951        struct ref **tail = &ret;
 952        while (ref) {
 953                *tail = copy_ref(ref);
 954                ref = ref->next;
 955                tail = &((*tail)->next);
 956        }
 957        return ret;
 958}
 959
 960static void free_ref(struct ref *ref)
 961{
 962        if (!ref)
 963                return;
 964        free_ref(ref->peer_ref);
 965        free(ref->remote_status);
 966        free(ref->symref);
 967        free(ref);
 968}
 969
 970void free_refs(struct ref *ref)
 971{
 972        struct ref *next;
 973        while (ref) {
 974                next = ref->next;
 975                free_ref(ref);
 976                ref = next;
 977        }
 978}
 979
 980int ref_compare_name(const void *va, const void *vb)
 981{
 982        const struct ref *a = va, *b = vb;
 983        return strcmp(a->name, b->name);
 984}
 985
 986static void *ref_list_get_next(const void *a)
 987{
 988        return ((const struct ref *)a)->next;
 989}
 990
 991static void ref_list_set_next(void *a, void *next)
 992{
 993        ((struct ref *)a)->next = next;
 994}
 995
 996void sort_ref_list(struct ref **l, int (*cmp)(const void *, const void *))
 997{
 998        *l = llist_mergesort(*l, ref_list_get_next, ref_list_set_next, cmp);
 999}
1000
1001int count_refspec_match(const char *pattern,
1002                        struct ref *refs,
1003                        struct ref **matched_ref)
1004{
1005        int patlen = strlen(pattern);
1006        struct ref *matched_weak = NULL;
1007        struct ref *matched = NULL;
1008        int weak_match = 0;
1009        int match = 0;
1010
1011        for (weak_match = match = 0; refs; refs = refs->next) {
1012                char *name = refs->name;
1013                int namelen = strlen(name);
1014
1015                if (!refname_match(pattern, name))
1016                        continue;
1017
1018                /* A match is "weak" if it is with refs outside
1019                 * heads or tags, and did not specify the pattern
1020                 * in full (e.g. "refs/remotes/origin/master") or at
1021                 * least from the toplevel (e.g. "remotes/origin/master");
1022                 * otherwise "git push $URL master" would result in
1023                 * ambiguity between remotes/origin/master and heads/master
1024                 * at the remote site.
1025                 */
1026                if (namelen != patlen &&
1027                    patlen != namelen - 5 &&
1028                    !starts_with(name, "refs/heads/") &&
1029                    !starts_with(name, "refs/tags/")) {
1030                        /* We want to catch the case where only weak
1031                         * matches are found and there are multiple
1032                         * matches, and where more than one strong
1033                         * matches are found, as ambiguous.  One
1034                         * strong match with zero or more weak matches
1035                         * are acceptable as a unique match.
1036                         */
1037                        matched_weak = refs;
1038                        weak_match++;
1039                }
1040                else {
1041                        matched = refs;
1042                        match++;
1043                }
1044        }
1045        if (!matched) {
1046                if (matched_ref)
1047                        *matched_ref = matched_weak;
1048                return weak_match;
1049        }
1050        else {
1051                if (matched_ref)
1052                        *matched_ref = matched;
1053                return match;
1054        }
1055}
1056
1057static void tail_link_ref(struct ref *ref, struct ref ***tail)
1058{
1059        **tail = ref;
1060        while (ref->next)
1061                ref = ref->next;
1062        *tail = &ref->next;
1063}
1064
1065static struct ref *alloc_delete_ref(void)
1066{
1067        struct ref *ref = alloc_ref("(delete)");
1068        oidclr(&ref->new_oid);
1069        return ref;
1070}
1071
1072static int try_explicit_object_name(const char *name,
1073                                    struct ref **match)
1074{
1075        struct object_id oid;
1076
1077        if (!*name) {
1078                if (match)
1079                        *match = alloc_delete_ref();
1080                return 0;
1081        }
1082
1083        if (get_sha1(name, oid.hash))
1084                return -1;
1085
1086        if (match) {
1087                *match = alloc_ref(name);
1088                oidcpy(&(*match)->new_oid, &oid);
1089        }
1090        return 0;
1091}
1092
1093static struct ref *make_linked_ref(const char *name, struct ref ***tail)
1094{
1095        struct ref *ret = alloc_ref(name);
1096        tail_link_ref(ret, tail);
1097        return ret;
1098}
1099
1100static char *guess_ref(const char *name, struct ref *peer)
1101{
1102        struct strbuf buf = STRBUF_INIT;
1103        struct object_id oid;
1104
1105        const char *r = resolve_ref_unsafe(peer->name, RESOLVE_REF_READING,
1106                                           oid.hash, NULL);
1107        if (!r)
1108                return NULL;
1109
1110        if (starts_with(r, "refs/heads/"))
1111                strbuf_addstr(&buf, "refs/heads/");
1112        else if (starts_with(r, "refs/tags/"))
1113                strbuf_addstr(&buf, "refs/tags/");
1114        else
1115                return NULL;
1116
1117        strbuf_addstr(&buf, name);
1118        return strbuf_detach(&buf, NULL);
1119}
1120
1121static int match_explicit_lhs(struct ref *src,
1122                              struct refspec *rs,
1123                              struct ref **match,
1124                              int *allocated_match)
1125{
1126        switch (count_refspec_match(rs->src, src, match)) {
1127        case 1:
1128                if (allocated_match)
1129                        *allocated_match = 0;
1130                return 0;
1131        case 0:
1132                /* The source could be in the get_sha1() format
1133                 * not a reference name.  :refs/other is a
1134                 * way to delete 'other' ref at the remote end.
1135                 */
1136                if (try_explicit_object_name(rs->src, match) < 0)
1137                        return error("src refspec %s does not match any.", rs->src);
1138                if (allocated_match)
1139                        *allocated_match = 1;
1140                return 0;
1141        default:
1142                return error("src refspec %s matches more than one.", rs->src);
1143        }
1144}
1145
1146static int match_explicit(struct ref *src, struct ref *dst,
1147                          struct ref ***dst_tail,
1148                          struct refspec *rs)
1149{
1150        struct ref *matched_src, *matched_dst;
1151        int allocated_src;
1152
1153        const char *dst_value = rs->dst;
1154        char *dst_guess;
1155
1156        if (rs->pattern || rs->matching)
1157                return 0;
1158
1159        matched_src = matched_dst = NULL;
1160        if (match_explicit_lhs(src, rs, &matched_src, &allocated_src) < 0)
1161                return -1;
1162
1163        if (!dst_value) {
1164                struct object_id oid;
1165                int flag;
1166
1167                dst_value = resolve_ref_unsafe(matched_src->name,
1168                                               RESOLVE_REF_READING,
1169                                               oid.hash, &flag);
1170                if (!dst_value ||
1171                    ((flag & REF_ISSYMREF) &&
1172                     !starts_with(dst_value, "refs/heads/")))
1173                        die("%s cannot be resolved to branch.",
1174                            matched_src->name);
1175        }
1176
1177        switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1178        case 1:
1179                break;
1180        case 0:
1181                if (starts_with(dst_value, "refs/"))
1182                        matched_dst = make_linked_ref(dst_value, dst_tail);
1183                else if (is_null_oid(&matched_src->new_oid))
1184                        error("unable to delete '%s': remote ref does not exist",
1185                              dst_value);
1186                else if ((dst_guess = guess_ref(dst_value, matched_src)))
1187                        matched_dst = make_linked_ref(dst_guess, dst_tail);
1188                else
1189                        error("unable to push to unqualified destination: %s\n"
1190                              "The destination refspec neither matches an "
1191                              "existing ref on the remote nor\n"
1192                              "begins with refs/, and we are unable to "
1193                              "guess a prefix based on the source ref.",
1194                              dst_value);
1195                break;
1196        default:
1197                matched_dst = NULL;
1198                error("dst refspec %s matches more than one.",
1199                      dst_value);
1200                break;
1201        }
1202        if (!matched_dst)
1203                return -1;
1204        if (matched_dst->peer_ref)
1205                return error("dst ref %s receives from more than one src.",
1206                      matched_dst->name);
1207        else {
1208                matched_dst->peer_ref = allocated_src ?
1209                                        matched_src :
1210                                        copy_ref(matched_src);
1211                matched_dst->force = rs->force;
1212        }
1213        return 0;
1214}
1215
1216static int match_explicit_refs(struct ref *src, struct ref *dst,
1217                               struct ref ***dst_tail, struct refspec *rs,
1218                               int rs_nr)
1219{
1220        int i, errs;
1221        for (i = errs = 0; i < rs_nr; i++)
1222                errs += match_explicit(src, dst, dst_tail, &rs[i]);
1223        return errs;
1224}
1225
1226static char *get_ref_match(const struct refspec *rs, int rs_nr, const struct ref *ref,
1227                int send_mirror, int direction, const struct refspec **ret_pat)
1228{
1229        const struct refspec *pat;
1230        char *name;
1231        int i;
1232        int matching_refs = -1;
1233        for (i = 0; i < rs_nr; i++) {
1234                if (rs[i].matching &&
1235                    (matching_refs == -1 || rs[i].force)) {
1236                        matching_refs = i;
1237                        continue;
1238                }
1239
1240                if (rs[i].pattern) {
1241                        const char *dst_side = rs[i].dst ? rs[i].dst : rs[i].src;
1242                        int match;
1243                        if (direction == FROM_SRC)
1244                                match = match_name_with_pattern(rs[i].src, ref->name, dst_side, &name);
1245                        else
1246                                match = match_name_with_pattern(dst_side, ref->name, rs[i].src, &name);
1247                        if (match) {
1248                                matching_refs = i;
1249                                break;
1250                        }
1251                }
1252        }
1253        if (matching_refs == -1)
1254                return NULL;
1255
1256        pat = rs + matching_refs;
1257        if (pat->matching) {
1258                /*
1259                 * "matching refs"; traditionally we pushed everything
1260                 * including refs outside refs/heads/ hierarchy, but
1261                 * that does not make much sense these days.
1262                 */
1263                if (!send_mirror && !starts_with(ref->name, "refs/heads/"))
1264                        return NULL;
1265                name = xstrdup(ref->name);
1266        }
1267        if (ret_pat)
1268                *ret_pat = pat;
1269        return name;
1270}
1271
1272static struct ref **tail_ref(struct ref **head)
1273{
1274        struct ref **tail = head;
1275        while (*tail)
1276                tail = &((*tail)->next);
1277        return tail;
1278}
1279
1280struct tips {
1281        struct commit **tip;
1282        int nr, alloc;
1283};
1284
1285static void add_to_tips(struct tips *tips, const struct object_id *oid)
1286{
1287        struct commit *commit;
1288
1289        if (is_null_oid(oid))
1290                return;
1291        commit = lookup_commit_reference_gently(oid->hash, 1);
1292        if (!commit || (commit->object.flags & TMP_MARK))
1293                return;
1294        commit->object.flags |= TMP_MARK;
1295        ALLOC_GROW(tips->tip, tips->nr + 1, tips->alloc);
1296        tips->tip[tips->nr++] = commit;
1297}
1298
1299static void add_missing_tags(struct ref *src, struct ref **dst, struct ref ***dst_tail)
1300{
1301        struct string_list dst_tag = STRING_LIST_INIT_NODUP;
1302        struct string_list src_tag = STRING_LIST_INIT_NODUP;
1303        struct string_list_item *item;
1304        struct ref *ref;
1305        struct tips sent_tips;
1306
1307        /*
1308         * Collect everything we know they would have at the end of
1309         * this push, and collect all tags they have.
1310         */
1311        memset(&sent_tips, 0, sizeof(sent_tips));
1312        for (ref = *dst; ref; ref = ref->next) {
1313                if (ref->peer_ref &&
1314                    !is_null_oid(&ref->peer_ref->new_oid))
1315                        add_to_tips(&sent_tips, &ref->peer_ref->new_oid);
1316                else
1317                        add_to_tips(&sent_tips, &ref->old_oid);
1318                if (starts_with(ref->name, "refs/tags/"))
1319                        string_list_append(&dst_tag, ref->name);
1320        }
1321        clear_commit_marks_many(sent_tips.nr, sent_tips.tip, TMP_MARK);
1322
1323        string_list_sort(&dst_tag);
1324
1325        /* Collect tags they do not have. */
1326        for (ref = src; ref; ref = ref->next) {
1327                if (!starts_with(ref->name, "refs/tags/"))
1328                        continue; /* not a tag */
1329                if (string_list_has_string(&dst_tag, ref->name))
1330                        continue; /* they already have it */
1331                if (sha1_object_info(ref->new_oid.hash, NULL) != OBJ_TAG)
1332                        continue; /* be conservative */
1333                item = string_list_append(&src_tag, ref->name);
1334                item->util = ref;
1335        }
1336        string_list_clear(&dst_tag, 0);
1337
1338        /*
1339         * At this point, src_tag lists tags that are missing from
1340         * dst, and sent_tips lists the tips we are pushing or those
1341         * that we know they already have. An element in the src_tag
1342         * that is an ancestor of any of the sent_tips needs to be
1343         * sent to the other side.
1344         */
1345        if (sent_tips.nr) {
1346                for_each_string_list_item(item, &src_tag) {
1347                        struct ref *ref = item->util;
1348                        struct ref *dst_ref;
1349                        struct commit *commit;
1350
1351                        if (is_null_oid(&ref->new_oid))
1352                                continue;
1353                        commit = lookup_commit_reference_gently(ref->new_oid.hash, 1);
1354                        if (!commit)
1355                                /* not pushing a commit, which is not an error */
1356                                continue;
1357
1358                        /*
1359                         * Is this tag, which they do not have, reachable from
1360                         * any of the commits we are sending?
1361                         */
1362                        if (!in_merge_bases_many(commit, sent_tips.nr, sent_tips.tip))
1363                                continue;
1364
1365                        /* Add it in */
1366                        dst_ref = make_linked_ref(ref->name, dst_tail);
1367                        oidcpy(&dst_ref->new_oid, &ref->new_oid);
1368                        dst_ref->peer_ref = copy_ref(ref);
1369                }
1370        }
1371        string_list_clear(&src_tag, 0);
1372        free(sent_tips.tip);
1373}
1374
1375struct ref *find_ref_by_name(const struct ref *list, const char *name)
1376{
1377        for ( ; list; list = list->next)
1378                if (!strcmp(list->name, name))
1379                        return (struct ref *)list;
1380        return NULL;
1381}
1382
1383static void prepare_ref_index(struct string_list *ref_index, struct ref *ref)
1384{
1385        for ( ; ref; ref = ref->next)
1386                string_list_append_nodup(ref_index, ref->name)->util = ref;
1387
1388        string_list_sort(ref_index);
1389}
1390
1391/*
1392 * Given only the set of local refs, sanity-check the set of push
1393 * refspecs. We can't catch all errors that match_push_refs would,
1394 * but we can catch some errors early before even talking to the
1395 * remote side.
1396 */
1397int check_push_refs(struct ref *src, int nr_refspec, const char **refspec_names)
1398{
1399        struct refspec *refspec = parse_push_refspec(nr_refspec, refspec_names);
1400        int ret = 0;
1401        int i;
1402
1403        for (i = 0; i < nr_refspec; i++) {
1404                struct refspec *rs = refspec + i;
1405
1406                if (rs->pattern || rs->matching)
1407                        continue;
1408
1409                ret |= match_explicit_lhs(src, rs, NULL, NULL);
1410        }
1411
1412        free_refspec(nr_refspec, refspec);
1413        return ret;
1414}
1415
1416/*
1417 * Given the set of refs the local repository has, the set of refs the
1418 * remote repository has, and the refspec used for push, determine
1419 * what remote refs we will update and with what value by setting
1420 * peer_ref (which object is being pushed) and force (if the push is
1421 * forced) in elements of "dst". The function may add new elements to
1422 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
1423 */
1424int match_push_refs(struct ref *src, struct ref **dst,
1425                    int nr_refspec, const char **refspec, int flags)
1426{
1427        struct refspec *rs;
1428        int send_all = flags & MATCH_REFS_ALL;
1429        int send_mirror = flags & MATCH_REFS_MIRROR;
1430        int send_prune = flags & MATCH_REFS_PRUNE;
1431        int errs;
1432        static const char *default_refspec[] = { ":", NULL };
1433        struct ref *ref, **dst_tail = tail_ref(dst);
1434        struct string_list dst_ref_index = STRING_LIST_INIT_NODUP;
1435
1436        if (!nr_refspec) {
1437                nr_refspec = 1;
1438                refspec = default_refspec;
1439        }
1440        rs = parse_push_refspec(nr_refspec, (const char **) refspec);
1441        errs = match_explicit_refs(src, *dst, &dst_tail, rs, nr_refspec);
1442
1443        /* pick the remainder */
1444        for (ref = src; ref; ref = ref->next) {
1445                struct string_list_item *dst_item;
1446                struct ref *dst_peer;
1447                const struct refspec *pat = NULL;
1448                char *dst_name;
1449
1450                dst_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_SRC, &pat);
1451                if (!dst_name)
1452                        continue;
1453
1454                if (!dst_ref_index.nr)
1455                        prepare_ref_index(&dst_ref_index, *dst);
1456
1457                dst_item = string_list_lookup(&dst_ref_index, dst_name);
1458                dst_peer = dst_item ? dst_item->util : NULL;
1459                if (dst_peer) {
1460                        if (dst_peer->peer_ref)
1461                                /* We're already sending something to this ref. */
1462                                goto free_name;
1463                } else {
1464                        if (pat->matching && !(send_all || send_mirror))
1465                                /*
1466                                 * Remote doesn't have it, and we have no
1467                                 * explicit pattern, and we don't have
1468                                 * --all or --mirror.
1469                                 */
1470                                goto free_name;
1471
1472                        /* Create a new one and link it */
1473                        dst_peer = make_linked_ref(dst_name, &dst_tail);
1474                        oidcpy(&dst_peer->new_oid, &ref->new_oid);
1475                        string_list_insert(&dst_ref_index,
1476                                dst_peer->name)->util = dst_peer;
1477                }
1478                dst_peer->peer_ref = copy_ref(ref);
1479                dst_peer->force = pat->force;
1480        free_name:
1481                free(dst_name);
1482        }
1483
1484        string_list_clear(&dst_ref_index, 0);
1485
1486        if (flags & MATCH_REFS_FOLLOW_TAGS)
1487                add_missing_tags(src, dst, &dst_tail);
1488
1489        if (send_prune) {
1490                struct string_list src_ref_index = STRING_LIST_INIT_NODUP;
1491                /* check for missing refs on the remote */
1492                for (ref = *dst; ref; ref = ref->next) {
1493                        char *src_name;
1494
1495                        if (ref->peer_ref)
1496                                /* We're already sending something to this ref. */
1497                                continue;
1498
1499                        src_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_DST, NULL);
1500                        if (src_name) {
1501                                if (!src_ref_index.nr)
1502                                        prepare_ref_index(&src_ref_index, src);
1503                                if (!string_list_has_string(&src_ref_index,
1504                                            src_name))
1505                                        ref->peer_ref = alloc_delete_ref();
1506                                free(src_name);
1507                        }
1508                }
1509                string_list_clear(&src_ref_index, 0);
1510        }
1511        if (errs)
1512                return -1;
1513        return 0;
1514}
1515
1516void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1517                             int force_update)
1518{
1519        struct ref *ref;
1520
1521        for (ref = remote_refs; ref; ref = ref->next) {
1522                int force_ref_update = ref->force || force_update;
1523                int reject_reason = 0;
1524
1525                if (ref->peer_ref)
1526                        oidcpy(&ref->new_oid, &ref->peer_ref->new_oid);
1527                else if (!send_mirror)
1528                        continue;
1529
1530                ref->deletion = is_null_oid(&ref->new_oid);
1531                if (!ref->deletion &&
1532                        !oidcmp(&ref->old_oid, &ref->new_oid)) {
1533                        ref->status = REF_STATUS_UPTODATE;
1534                        continue;
1535                }
1536
1537                /*
1538                 * If the remote ref has moved and is now different
1539                 * from what we expect, reject any push.
1540                 *
1541                 * It also is an error if the user told us to check
1542                 * with the remote-tracking branch to find the value
1543                 * to expect, but we did not have such a tracking
1544                 * branch.
1545                 */
1546                if (ref->expect_old_sha1) {
1547                        if (ref->expect_old_no_trackback ||
1548                            oidcmp(&ref->old_oid, &ref->old_oid_expect))
1549                                reject_reason = REF_STATUS_REJECT_STALE;
1550                        else
1551                                /* If the ref isn't stale then force the update. */
1552                                force_ref_update = 1;
1553                }
1554
1555                /*
1556                 * If the update isn't already rejected then check
1557                 * the usual "must fast-forward" rules.
1558                 *
1559                 * Decide whether an individual refspec A:B can be
1560                 * pushed.  The push will succeed if any of the
1561                 * following are true:
1562                 *
1563                 * (1) the remote reference B does not exist
1564                 *
1565                 * (2) the remote reference B is being removed (i.e.,
1566                 *     pushing :B where no source is specified)
1567                 *
1568                 * (3) the destination is not under refs/tags/, and
1569                 *     if the old and new value is a commit, the new
1570                 *     is a descendant of the old.
1571                 *
1572                 * (4) it is forced using the +A:B notation, or by
1573                 *     passing the --force argument
1574                 */
1575
1576                if (!reject_reason && !ref->deletion && !is_null_oid(&ref->old_oid)) {
1577                        if (starts_with(ref->name, "refs/tags/"))
1578                                reject_reason = REF_STATUS_REJECT_ALREADY_EXISTS;
1579                        else if (!has_object_file(&ref->old_oid))
1580                                reject_reason = REF_STATUS_REJECT_FETCH_FIRST;
1581                        else if (!lookup_commit_reference_gently(ref->old_oid.hash, 1) ||
1582                                 !lookup_commit_reference_gently(ref->new_oid.hash, 1))
1583                                reject_reason = REF_STATUS_REJECT_NEEDS_FORCE;
1584                        else if (!ref_newer(&ref->new_oid, &ref->old_oid))
1585                                reject_reason = REF_STATUS_REJECT_NONFASTFORWARD;
1586                }
1587
1588                /*
1589                 * "--force" will defeat any rejection implemented
1590                 * by the rules above.
1591                 */
1592                if (!force_ref_update)
1593                        ref->status = reject_reason;
1594                else if (reject_reason)
1595                        ref->forced_update = 1;
1596        }
1597}
1598
1599static void set_merge(struct branch *ret)
1600{
1601        struct remote *remote;
1602        char *ref;
1603        struct object_id oid;
1604        int i;
1605
1606        if (!ret)
1607                return; /* no branch */
1608        if (ret->merge)
1609                return; /* already run */
1610        if (!ret->remote_name || !ret->merge_nr) {
1611                /*
1612                 * no merge config; let's make sure we don't confuse callers
1613                 * with a non-zero merge_nr but a NULL merge
1614                 */
1615                ret->merge_nr = 0;
1616                return;
1617        }
1618
1619        remote = remote_get(ret->remote_name);
1620
1621        ret->merge = xcalloc(ret->merge_nr, sizeof(*ret->merge));
1622        for (i = 0; i < ret->merge_nr; i++) {
1623                ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1624                ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1625                if (!remote_find_tracking(remote, ret->merge[i]) ||
1626                    strcmp(ret->remote_name, "."))
1627                        continue;
1628                if (dwim_ref(ret->merge_name[i], strlen(ret->merge_name[i]),
1629                             oid.hash, &ref) == 1)
1630                        ret->merge[i]->dst = ref;
1631                else
1632                        ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1633        }
1634}
1635
1636struct branch *branch_get(const char *name)
1637{
1638        struct branch *ret;
1639
1640        read_config();
1641        if (!name || !*name || !strcmp(name, "HEAD"))
1642                ret = current_branch;
1643        else
1644                ret = make_branch(name, 0);
1645        set_merge(ret);
1646        return ret;
1647}
1648
1649int branch_has_merge_config(struct branch *branch)
1650{
1651        return branch && !!branch->merge;
1652}
1653
1654int branch_merge_matches(struct branch *branch,
1655                                 int i,
1656                                 const char *refname)
1657{
1658        if (!branch || i < 0 || i >= branch->merge_nr)
1659                return 0;
1660        return refname_match(branch->merge[i]->src, refname);
1661}
1662
1663__attribute__((format (printf,2,3)))
1664static const char *error_buf(struct strbuf *err, const char *fmt, ...)
1665{
1666        if (err) {
1667                va_list ap;
1668                va_start(ap, fmt);
1669                strbuf_vaddf(err, fmt, ap);
1670                va_end(ap);
1671        }
1672        return NULL;
1673}
1674
1675const char *branch_get_upstream(struct branch *branch, struct strbuf *err)
1676{
1677        if (!branch)
1678                return error_buf(err, _("HEAD does not point to a branch"));
1679
1680        if (!branch->merge || !branch->merge[0]) {
1681                /*
1682                 * no merge config; is it because the user didn't define any,
1683                 * or because it is not a real branch, and get_branch
1684                 * auto-vivified it?
1685                 */
1686                if (!ref_exists(branch->refname))
1687                        return error_buf(err, _("no such branch: '%s'"),
1688                                         branch->name);
1689                return error_buf(err,
1690                                 _("no upstream configured for branch '%s'"),
1691                                 branch->name);
1692        }
1693
1694        if (!branch->merge[0]->dst)
1695                return error_buf(err,
1696                                 _("upstream branch '%s' not stored as a remote-tracking branch"),
1697                                 branch->merge[0]->src);
1698
1699        return branch->merge[0]->dst;
1700}
1701
1702static const char *tracking_for_push_dest(struct remote *remote,
1703                                          const char *refname,
1704                                          struct strbuf *err)
1705{
1706        char *ret;
1707
1708        ret = apply_refspecs(remote->fetch, remote->fetch_refspec_nr, refname);
1709        if (!ret)
1710                return error_buf(err,
1711                                 _("push destination '%s' on remote '%s' has no local tracking branch"),
1712                                 refname, remote->name);
1713        return ret;
1714}
1715
1716static const char *branch_get_push_1(struct branch *branch, struct strbuf *err)
1717{
1718        struct remote *remote;
1719
1720        if (!branch)
1721                return error_buf(err, _("HEAD does not point to a branch"));
1722
1723        remote = remote_get(pushremote_for_branch(branch, NULL));
1724        if (!remote)
1725                return error_buf(err,
1726                                 _("branch '%s' has no remote for pushing"),
1727                                 branch->name);
1728
1729        if (remote->push_refspec_nr) {
1730                char *dst;
1731                const char *ret;
1732
1733                dst = apply_refspecs(remote->push, remote->push_refspec_nr,
1734                                     branch->refname);
1735                if (!dst)
1736                        return error_buf(err,
1737                                         _("push refspecs for '%s' do not include '%s'"),
1738                                         remote->name, branch->name);
1739
1740                ret = tracking_for_push_dest(remote, dst, err);
1741                free(dst);
1742                return ret;
1743        }
1744
1745        if (remote->mirror)
1746                return tracking_for_push_dest(remote, branch->refname, err);
1747
1748        switch (push_default) {
1749        case PUSH_DEFAULT_NOTHING:
1750                return error_buf(err, _("push has no destination (push.default is 'nothing')"));
1751
1752        case PUSH_DEFAULT_MATCHING:
1753        case PUSH_DEFAULT_CURRENT:
1754                return tracking_for_push_dest(remote, branch->refname, err);
1755
1756        case PUSH_DEFAULT_UPSTREAM:
1757                return branch_get_upstream(branch, err);
1758
1759        case PUSH_DEFAULT_UNSPECIFIED:
1760        case PUSH_DEFAULT_SIMPLE:
1761                {
1762                        const char *up, *cur;
1763
1764                        up = branch_get_upstream(branch, err);
1765                        if (!up)
1766                                return NULL;
1767                        cur = tracking_for_push_dest(remote, branch->refname, err);
1768                        if (!cur)
1769                                return NULL;
1770                        if (strcmp(cur, up))
1771                                return error_buf(err,
1772                                                 _("cannot resolve 'simple' push to a single destination"));
1773                        return cur;
1774                }
1775        }
1776
1777        die("BUG: unhandled push situation");
1778}
1779
1780const char *branch_get_push(struct branch *branch, struct strbuf *err)
1781{
1782        if (!branch->push_tracking_ref)
1783                branch->push_tracking_ref = branch_get_push_1(branch, err);
1784        return branch->push_tracking_ref;
1785}
1786
1787static int ignore_symref_update(const char *refname)
1788{
1789        struct object_id oid;
1790        int flag;
1791
1792        if (!resolve_ref_unsafe(refname, 0, oid.hash, &flag))
1793                return 0; /* non-existing refs are OK */
1794        return (flag & REF_ISSYMREF);
1795}
1796
1797/*
1798 * Create and return a list of (struct ref) consisting of copies of
1799 * each remote_ref that matches refspec.  refspec must be a pattern.
1800 * Fill in the copies' peer_ref to describe the local tracking refs to
1801 * which they map.  Omit any references that would map to an existing
1802 * local symbolic ref.
1803 */
1804static struct ref *get_expanded_map(const struct ref *remote_refs,
1805                                    const struct refspec *refspec)
1806{
1807        const struct ref *ref;
1808        struct ref *ret = NULL;
1809        struct ref **tail = &ret;
1810
1811        for (ref = remote_refs; ref; ref = ref->next) {
1812                char *expn_name = NULL;
1813
1814                if (strchr(ref->name, '^'))
1815                        continue; /* a dereference item */
1816                if (match_name_with_pattern(refspec->src, ref->name,
1817                                            refspec->dst, &expn_name) &&
1818                    !ignore_symref_update(expn_name)) {
1819                        struct ref *cpy = copy_ref(ref);
1820
1821                        cpy->peer_ref = alloc_ref(expn_name);
1822                        if (refspec->force)
1823                                cpy->peer_ref->force = 1;
1824                        *tail = cpy;
1825                        tail = &cpy->next;
1826                }
1827                free(expn_name);
1828        }
1829
1830        return ret;
1831}
1832
1833static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1834{
1835        const struct ref *ref;
1836        for (ref = refs; ref; ref = ref->next) {
1837                if (refname_match(name, ref->name))
1838                        return ref;
1839        }
1840        return NULL;
1841}
1842
1843struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1844{
1845        const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1846
1847        if (!ref)
1848                return NULL;
1849
1850        return copy_ref(ref);
1851}
1852
1853static struct ref *get_local_ref(const char *name)
1854{
1855        if (!name || name[0] == '\0')
1856                return NULL;
1857
1858        if (starts_with(name, "refs/"))
1859                return alloc_ref(name);
1860
1861        if (starts_with(name, "heads/") ||
1862            starts_with(name, "tags/") ||
1863            starts_with(name, "remotes/"))
1864                return alloc_ref_with_prefix("refs/", 5, name);
1865
1866        return alloc_ref_with_prefix("refs/heads/", 11, name);
1867}
1868
1869int get_fetch_map(const struct ref *remote_refs,
1870                  const struct refspec *refspec,
1871                  struct ref ***tail,
1872                  int missing_ok)
1873{
1874        struct ref *ref_map, **rmp;
1875
1876        if (refspec->pattern) {
1877                ref_map = get_expanded_map(remote_refs, refspec);
1878        } else {
1879                const char *name = refspec->src[0] ? refspec->src : "HEAD";
1880
1881                if (refspec->exact_sha1) {
1882                        ref_map = alloc_ref(name);
1883                        get_oid_hex(name, &ref_map->old_oid);
1884                } else {
1885                        ref_map = get_remote_ref(remote_refs, name);
1886                }
1887                if (!missing_ok && !ref_map)
1888                        die("Couldn't find remote ref %s", name);
1889                if (ref_map) {
1890                        ref_map->peer_ref = get_local_ref(refspec->dst);
1891                        if (ref_map->peer_ref && refspec->force)
1892                                ref_map->peer_ref->force = 1;
1893                }
1894        }
1895
1896        for (rmp = &ref_map; *rmp; ) {
1897                if ((*rmp)->peer_ref) {
1898                        if (!starts_with((*rmp)->peer_ref->name, "refs/") ||
1899                            check_refname_format((*rmp)->peer_ref->name, 0)) {
1900                                struct ref *ignore = *rmp;
1901                                error("* Ignoring funny ref '%s' locally",
1902                                      (*rmp)->peer_ref->name);
1903                                *rmp = (*rmp)->next;
1904                                free(ignore->peer_ref);
1905                                free(ignore);
1906                                continue;
1907                        }
1908                }
1909                rmp = &((*rmp)->next);
1910        }
1911
1912        if (ref_map)
1913                tail_link_ref(ref_map, tail);
1914
1915        return 0;
1916}
1917
1918int resolve_remote_symref(struct ref *ref, struct ref *list)
1919{
1920        if (!ref->symref)
1921                return 0;
1922        for (; list; list = list->next)
1923                if (!strcmp(ref->symref, list->name)) {
1924                        oidcpy(&ref->old_oid, &list->old_oid);
1925                        return 0;
1926                }
1927        return 1;
1928}
1929
1930static void unmark_and_free(struct commit_list *list, unsigned int mark)
1931{
1932        while (list) {
1933                struct commit *commit = pop_commit(&list);
1934                commit->object.flags &= ~mark;
1935        }
1936}
1937
1938int ref_newer(const struct object_id *new_oid, const struct object_id *old_oid)
1939{
1940        struct object *o;
1941        struct commit *old, *new;
1942        struct commit_list *list, *used;
1943        int found = 0;
1944
1945        /*
1946         * Both new and old must be commit-ish and new is descendant of
1947         * old.  Otherwise we require --force.
1948         */
1949        o = deref_tag(parse_object(old_oid->hash), NULL, 0);
1950        if (!o || o->type != OBJ_COMMIT)
1951                return 0;
1952        old = (struct commit *) o;
1953
1954        o = deref_tag(parse_object(new_oid->hash), NULL, 0);
1955        if (!o || o->type != OBJ_COMMIT)
1956                return 0;
1957        new = (struct commit *) o;
1958
1959        if (parse_commit(new) < 0)
1960                return 0;
1961
1962        used = list = NULL;
1963        commit_list_insert(new, &list);
1964        while (list) {
1965                new = pop_most_recent_commit(&list, TMP_MARK);
1966                commit_list_insert(new, &used);
1967                if (new == old) {
1968                        found = 1;
1969                        break;
1970                }
1971        }
1972        unmark_and_free(list, TMP_MARK);
1973        unmark_and_free(used, TMP_MARK);
1974        return found;
1975}
1976
1977/*
1978 * Compare a branch with its upstream, and save their differences (number
1979 * of commits) in *num_ours and *num_theirs. The name of the upstream branch
1980 * (or NULL if no upstream is defined) is returned via *upstream_name, if it
1981 * is not itself NULL.
1982 *
1983 * Returns -1 if num_ours and num_theirs could not be filled in (e.g., no
1984 * upstream defined, or ref does not exist), 0 otherwise.
1985 */
1986int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs,
1987                       const char **upstream_name)
1988{
1989        struct object_id oid;
1990        struct commit *ours, *theirs;
1991        struct rev_info revs;
1992        const char *base;
1993        struct argv_array argv = ARGV_ARRAY_INIT;
1994
1995        /* Cannot stat unless we are marked to build on top of somebody else. */
1996        base = branch_get_upstream(branch, NULL);
1997        if (upstream_name)
1998                *upstream_name = base;
1999        if (!base)
2000                return -1;
2001
2002        /* Cannot stat if what we used to build on no longer exists */
2003        if (read_ref(base, oid.hash))
2004                return -1;
2005        theirs = lookup_commit_reference(oid.hash);
2006        if (!theirs)
2007                return -1;
2008
2009        if (read_ref(branch->refname, oid.hash))
2010                return -1;
2011        ours = lookup_commit_reference(oid.hash);
2012        if (!ours)
2013                return -1;
2014
2015        /* are we the same? */
2016        if (theirs == ours) {
2017                *num_theirs = *num_ours = 0;
2018                return 0;
2019        }
2020
2021        /* Run "rev-list --left-right ours...theirs" internally... */
2022        argv_array_push(&argv, ""); /* ignored */
2023        argv_array_push(&argv, "--left-right");
2024        argv_array_pushf(&argv, "%s...%s",
2025                         oid_to_hex(&ours->object.oid),
2026                         oid_to_hex(&theirs->object.oid));
2027        argv_array_push(&argv, "--");
2028
2029        init_revisions(&revs, NULL);
2030        setup_revisions(argv.argc, argv.argv, &revs, NULL);
2031        if (prepare_revision_walk(&revs))
2032                die("revision walk setup failed");
2033
2034        /* ... and count the commits on each side. */
2035        *num_ours = 0;
2036        *num_theirs = 0;
2037        while (1) {
2038                struct commit *c = get_revision(&revs);
2039                if (!c)
2040                        break;
2041                if (c->object.flags & SYMMETRIC_LEFT)
2042                        (*num_ours)++;
2043                else
2044                        (*num_theirs)++;
2045        }
2046
2047        /* clear object flags smudged by the above traversal */
2048        clear_commit_marks(ours, ALL_REV_FLAGS);
2049        clear_commit_marks(theirs, ALL_REV_FLAGS);
2050
2051        argv_array_clear(&argv);
2052        return 0;
2053}
2054
2055/*
2056 * Return true when there is anything to report, otherwise false.
2057 */
2058int format_tracking_info(struct branch *branch, struct strbuf *sb)
2059{
2060        int ours, theirs;
2061        const char *full_base;
2062        char *base;
2063        int upstream_is_gone = 0;
2064
2065        if (stat_tracking_info(branch, &ours, &theirs, &full_base) < 0) {
2066                if (!full_base)
2067                        return 0;
2068                upstream_is_gone = 1;
2069        }
2070
2071        base = shorten_unambiguous_ref(full_base, 0);
2072        if (upstream_is_gone) {
2073                strbuf_addf(sb,
2074                        _("Your branch is based on '%s', but the upstream is gone.\n"),
2075                        base);
2076                if (advice_status_hints)
2077                        strbuf_addf(sb,
2078                                _("  (use \"git branch --unset-upstream\" to fixup)\n"));
2079        } else if (!ours && !theirs) {
2080                strbuf_addf(sb,
2081                        _("Your branch is up-to-date with '%s'.\n"),
2082                        base);
2083        } else if (!theirs) {
2084                strbuf_addf(sb,
2085                        Q_("Your branch is ahead of '%s' by %d commit.\n",
2086                           "Your branch is ahead of '%s' by %d commits.\n",
2087                           ours),
2088                        base, ours);
2089                if (advice_status_hints)
2090                        strbuf_addf(sb,
2091                                _("  (use \"git push\" to publish your local commits)\n"));
2092        } else if (!ours) {
2093                strbuf_addf(sb,
2094                        Q_("Your branch is behind '%s' by %d commit, "
2095                               "and can be fast-forwarded.\n",
2096                           "Your branch is behind '%s' by %d commits, "
2097                               "and can be fast-forwarded.\n",
2098                           theirs),
2099                        base, theirs);
2100                if (advice_status_hints)
2101                        strbuf_addf(sb,
2102                                _("  (use \"git pull\" to update your local branch)\n"));
2103        } else {
2104                strbuf_addf(sb,
2105                        Q_("Your branch and '%s' have diverged,\n"
2106                               "and have %d and %d different commit each, "
2107                               "respectively.\n",
2108                           "Your branch and '%s' have diverged,\n"
2109                               "and have %d and %d different commits each, "
2110                               "respectively.\n",
2111                           ours + theirs),
2112                        base, ours, theirs);
2113                if (advice_status_hints)
2114                        strbuf_addf(sb,
2115                                _("  (use \"git pull\" to merge the remote branch into yours)\n"));
2116        }
2117        free(base);
2118        return 1;
2119}
2120
2121static int one_local_ref(const char *refname, const struct object_id *oid,
2122                         int flag, void *cb_data)
2123{
2124        struct ref ***local_tail = cb_data;
2125        struct ref *ref;
2126
2127        /* we already know it starts with refs/ to get here */
2128        if (check_refname_format(refname + 5, 0))
2129                return 0;
2130
2131        ref = alloc_ref(refname);
2132        oidcpy(&ref->new_oid, oid);
2133        **local_tail = ref;
2134        *local_tail = &ref->next;
2135        return 0;
2136}
2137
2138struct ref *get_local_heads(void)
2139{
2140        struct ref *local_refs = NULL, **local_tail = &local_refs;
2141
2142        for_each_ref(one_local_ref, &local_tail);
2143        return local_refs;
2144}
2145
2146struct ref *guess_remote_head(const struct ref *head,
2147                              const struct ref *refs,
2148                              int all)
2149{
2150        const struct ref *r;
2151        struct ref *list = NULL;
2152        struct ref **tail = &list;
2153
2154        if (!head)
2155                return NULL;
2156
2157        /*
2158         * Some transports support directly peeking at
2159         * where HEAD points; if that is the case, then
2160         * we don't have to guess.
2161         */
2162        if (head->symref)
2163                return copy_ref(find_ref_by_name(refs, head->symref));
2164
2165        /* If refs/heads/master could be right, it is. */
2166        if (!all) {
2167                r = find_ref_by_name(refs, "refs/heads/master");
2168                if (r && !oidcmp(&r->old_oid, &head->old_oid))
2169                        return copy_ref(r);
2170        }
2171
2172        /* Look for another ref that points there */
2173        for (r = refs; r; r = r->next) {
2174                if (r != head &&
2175                    starts_with(r->name, "refs/heads/") &&
2176                    !oidcmp(&r->old_oid, &head->old_oid)) {
2177                        *tail = copy_ref(r);
2178                        tail = &((*tail)->next);
2179                        if (!all)
2180                                break;
2181                }
2182        }
2183
2184        return list;
2185}
2186
2187struct stale_heads_info {
2188        struct string_list *ref_names;
2189        struct ref **stale_refs_tail;
2190        struct refspec *refs;
2191        int ref_count;
2192};
2193
2194static int get_stale_heads_cb(const char *refname, const struct object_id *oid,
2195                              int flags, void *cb_data)
2196{
2197        struct stale_heads_info *info = cb_data;
2198        struct string_list matches = STRING_LIST_INIT_DUP;
2199        struct refspec query;
2200        int i, stale = 1;
2201        memset(&query, 0, sizeof(struct refspec));
2202        query.dst = (char *)refname;
2203
2204        query_refspecs_multiple(info->refs, info->ref_count, &query, &matches);
2205        if (matches.nr == 0)
2206                goto clean_exit; /* No matches */
2207
2208        /*
2209         * If we did find a suitable refspec and it's not a symref and
2210         * it's not in the list of refs that currently exist in that
2211         * remote, we consider it to be stale. In order to deal with
2212         * overlapping refspecs, we need to go over all of the
2213         * matching refs.
2214         */
2215        if (flags & REF_ISSYMREF)
2216                goto clean_exit;
2217
2218        for (i = 0; stale && i < matches.nr; i++)
2219                if (string_list_has_string(info->ref_names, matches.items[i].string))
2220                        stale = 0;
2221
2222        if (stale) {
2223                struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
2224                oidcpy(&ref->new_oid, oid);
2225        }
2226
2227clean_exit:
2228        string_list_clear(&matches, 0);
2229        return 0;
2230}
2231
2232struct ref *get_stale_heads(struct refspec *refs, int ref_count, struct ref *fetch_map)
2233{
2234        struct ref *ref, *stale_refs = NULL;
2235        struct string_list ref_names = STRING_LIST_INIT_NODUP;
2236        struct stale_heads_info info;
2237
2238        info.ref_names = &ref_names;
2239        info.stale_refs_tail = &stale_refs;
2240        info.refs = refs;
2241        info.ref_count = ref_count;
2242        for (ref = fetch_map; ref; ref = ref->next)
2243                string_list_append(&ref_names, ref->name);
2244        string_list_sort(&ref_names);
2245        for_each_ref(get_stale_heads_cb, &info);
2246        string_list_clear(&ref_names, 0);
2247        return stale_refs;
2248}
2249
2250/*
2251 * Compare-and-swap
2252 */
2253static void clear_cas_option(struct push_cas_option *cas)
2254{
2255        int i;
2256
2257        for (i = 0; i < cas->nr; i++)
2258                free(cas->entry[i].refname);
2259        free(cas->entry);
2260        memset(cas, 0, sizeof(*cas));
2261}
2262
2263static struct push_cas *add_cas_entry(struct push_cas_option *cas,
2264                                      const char *refname,
2265                                      size_t refnamelen)
2266{
2267        struct push_cas *entry;
2268        ALLOC_GROW(cas->entry, cas->nr + 1, cas->alloc);
2269        entry = &cas->entry[cas->nr++];
2270        memset(entry, 0, sizeof(*entry));
2271        entry->refname = xmemdupz(refname, refnamelen);
2272        return entry;
2273}
2274
2275int parse_push_cas_option(struct push_cas_option *cas, const char *arg, int unset)
2276{
2277        const char *colon;
2278        struct push_cas *entry;
2279
2280        if (unset) {
2281                /* "--no-<option>" */
2282                clear_cas_option(cas);
2283                return 0;
2284        }
2285
2286        if (!arg) {
2287                /* just "--<option>" */
2288                cas->use_tracking_for_rest = 1;
2289                return 0;
2290        }
2291
2292        /* "--<option>=refname" or "--<option>=refname:value" */
2293        colon = strchrnul(arg, ':');
2294        entry = add_cas_entry(cas, arg, colon - arg);
2295        if (!*colon)
2296                entry->use_tracking = 1;
2297        else if (get_sha1(colon + 1, entry->expect))
2298                return error("cannot parse expected object name '%s'", colon + 1);
2299        return 0;
2300}
2301
2302int parseopt_push_cas_option(const struct option *opt, const char *arg, int unset)
2303{
2304        return parse_push_cas_option(opt->value, arg, unset);
2305}
2306
2307int is_empty_cas(const struct push_cas_option *cas)
2308{
2309        return !cas->use_tracking_for_rest && !cas->nr;
2310}
2311
2312/*
2313 * Look at remote.fetch refspec and see if we have a remote
2314 * tracking branch for the refname there.  Fill its current
2315 * value in sha1[].
2316 * If we cannot do so, return negative to signal an error.
2317 */
2318static int remote_tracking(struct remote *remote, const char *refname,
2319                           struct object_id *oid)
2320{
2321        char *dst;
2322
2323        dst = apply_refspecs(remote->fetch, remote->fetch_refspec_nr, refname);
2324        if (!dst)
2325                return -1; /* no tracking ref for refname at remote */
2326        if (read_ref(dst, oid->hash))
2327                return -1; /* we know what the tracking ref is but we cannot read it */
2328        return 0;
2329}
2330
2331static void apply_cas(struct push_cas_option *cas,
2332                      struct remote *remote,
2333                      struct ref *ref)
2334{
2335        int i;
2336
2337        /* Find an explicit --<option>=<name>[:<value>] entry */
2338        for (i = 0; i < cas->nr; i++) {
2339                struct push_cas *entry = &cas->entry[i];
2340                if (!refname_match(entry->refname, ref->name))
2341                        continue;
2342                ref->expect_old_sha1 = 1;
2343                if (!entry->use_tracking)
2344                        hashcpy(ref->old_oid_expect.hash, cas->entry[i].expect);
2345                else if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
2346                        ref->expect_old_no_trackback = 1;
2347                return;
2348        }
2349
2350        /* Are we using "--<option>" to cover all? */
2351        if (!cas->use_tracking_for_rest)
2352                return;
2353
2354        ref->expect_old_sha1 = 1;
2355        if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
2356                ref->expect_old_no_trackback = 1;
2357}
2358
2359void apply_push_cas(struct push_cas_option *cas,
2360                    struct remote *remote,
2361                    struct ref *remote_refs)
2362{
2363        struct ref *ref;
2364        for (ref = remote_refs; ref; ref = ref->next)
2365                apply_cas(cas, remote, ref);
2366}