remote.con commit Merge branch 'ah/log-decorate-default-to-auto' into maint (fb11de9)
   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->configured_in_repo = 1;
 259        remote->origin = REMOTE_REMOTES;
 260        while (strbuf_getline(&buf, f) != EOF) {
 261                const char *v;
 262
 263                strbuf_rtrim(&buf);
 264
 265                if (skip_prefix(buf.buf, "URL:", &v))
 266                        add_url_alias(remote, xstrdup(skip_spaces(v)));
 267                else if (skip_prefix(buf.buf, "Push:", &v))
 268                        add_push_refspec(remote, xstrdup(skip_spaces(v)));
 269                else if (skip_prefix(buf.buf, "Pull:", &v))
 270                        add_fetch_refspec(remote, xstrdup(skip_spaces(v)));
 271        }
 272        strbuf_release(&buf);
 273        fclose(f);
 274}
 275
 276static void read_branches_file(struct remote *remote)
 277{
 278        char *frag;
 279        struct strbuf buf = STRBUF_INIT;
 280        FILE *f = fopen(git_path("branches/%s", remote->name), "r");
 281
 282        if (!f)
 283                return;
 284
 285        strbuf_getline_lf(&buf, f);
 286        fclose(f);
 287        strbuf_trim(&buf);
 288        if (!buf.len) {
 289                strbuf_release(&buf);
 290                return;
 291        }
 292
 293        remote->configured_in_repo = 1;
 294        remote->origin = REMOTE_BRANCHES;
 295
 296        /*
 297         * The branches file would have URL and optionally
 298         * #branch specified.  The "master" (or specified) branch is
 299         * fetched and stored in the local branch matching the
 300         * remote name.
 301         */
 302        frag = strchr(buf.buf, '#');
 303        if (frag)
 304                *(frag++) = '\0';
 305        else
 306                frag = "master";
 307
 308        add_url_alias(remote, strbuf_detach(&buf, NULL));
 309        add_fetch_refspec(remote, xstrfmt("refs/heads/%s:refs/heads/%s",
 310                                          frag, remote->name));
 311
 312        /*
 313         * Cogito compatible push: push current HEAD to remote #branch
 314         * (master if missing)
 315         */
 316        add_push_refspec(remote, xstrfmt("HEAD:refs/heads/%s", frag));
 317        remote->fetch_tags = 1; /* always auto-follow */
 318}
 319
 320static int handle_config(const char *key, const char *value, void *cb)
 321{
 322        const char *name;
 323        int namelen;
 324        const char *subkey;
 325        struct remote *remote;
 326        struct branch *branch;
 327        if (parse_config_key(key, "branch", &name, &namelen, &subkey) >= 0) {
 328                if (!name)
 329                        return 0;
 330                branch = make_branch(name, namelen);
 331                if (!strcmp(subkey, "remote")) {
 332                        return git_config_string(&branch->remote_name, key, value);
 333                } else if (!strcmp(subkey, "pushremote")) {
 334                        return git_config_string(&branch->pushremote_name, key, value);
 335                } else if (!strcmp(subkey, "merge")) {
 336                        if (!value)
 337                                return config_error_nonbool(key);
 338                        add_merge(branch, xstrdup(value));
 339                }
 340                return 0;
 341        }
 342        if (parse_config_key(key, "url", &name, &namelen, &subkey) >= 0) {
 343                struct rewrite *rewrite;
 344                if (!name)
 345                        return 0;
 346                if (!strcmp(subkey, "insteadof")) {
 347                        rewrite = make_rewrite(&rewrites, name, namelen);
 348                        if (!value)
 349                                return config_error_nonbool(key);
 350                        add_instead_of(rewrite, xstrdup(value));
 351                } else if (!strcmp(subkey, "pushinsteadof")) {
 352                        rewrite = make_rewrite(&rewrites_push, name, namelen);
 353                        if (!value)
 354                                return config_error_nonbool(key);
 355                        add_instead_of(rewrite, xstrdup(value));
 356                }
 357        }
 358
 359        if (parse_config_key(key, "remote", &name, &namelen, &subkey) < 0)
 360                return 0;
 361
 362        /* Handle remote.* variables */
 363        if (!name && !strcmp(subkey, "pushdefault"))
 364                return git_config_string(&pushremote_name, key, value);
 365
 366        if (!name)
 367                return 0;
 368        /* Handle remote.<name>.* variables */
 369        if (*name == '/') {
 370                warning("Config remote shorthand cannot begin with '/': %s",
 371                        name);
 372                return 0;
 373        }
 374        remote = make_remote(name, namelen);
 375        remote->origin = REMOTE_CONFIG;
 376        if (current_config_scope() == CONFIG_SCOPE_REPO)
 377                remote->configured_in_repo = 1;
 378        if (!strcmp(subkey, "mirror"))
 379                remote->mirror = git_config_bool(key, value);
 380        else if (!strcmp(subkey, "skipdefaultupdate"))
 381                remote->skip_default_update = git_config_bool(key, value);
 382        else if (!strcmp(subkey, "skipfetchall"))
 383                remote->skip_default_update = git_config_bool(key, value);
 384        else if (!strcmp(subkey, "prune"))
 385                remote->prune = git_config_bool(key, value);
 386        else if (!strcmp(subkey, "url")) {
 387                const char *v;
 388                if (git_config_string(&v, key, value))
 389                        return -1;
 390                add_url(remote, v);
 391        } else if (!strcmp(subkey, "pushurl")) {
 392                const char *v;
 393                if (git_config_string(&v, key, value))
 394                        return -1;
 395                add_pushurl(remote, v);
 396        } else if (!strcmp(subkey, "push")) {
 397                const char *v;
 398                if (git_config_string(&v, key, value))
 399                        return -1;
 400                add_push_refspec(remote, v);
 401        } else if (!strcmp(subkey, "fetch")) {
 402                const char *v;
 403                if (git_config_string(&v, key, value))
 404                        return -1;
 405                add_fetch_refspec(remote, v);
 406        } else if (!strcmp(subkey, "receivepack")) {
 407                const char *v;
 408                if (git_config_string(&v, key, value))
 409                        return -1;
 410                if (!remote->receivepack)
 411                        remote->receivepack = v;
 412                else
 413                        error("more than one receivepack given, using the first");
 414        } else if (!strcmp(subkey, "uploadpack")) {
 415                const char *v;
 416                if (git_config_string(&v, key, value))
 417                        return -1;
 418                if (!remote->uploadpack)
 419                        remote->uploadpack = v;
 420                else
 421                        error("more than one uploadpack given, using the first");
 422        } else if (!strcmp(subkey, "tagopt")) {
 423                if (!strcmp(value, "--no-tags"))
 424                        remote->fetch_tags = -1;
 425                else if (!strcmp(value, "--tags"))
 426                        remote->fetch_tags = 2;
 427        } else if (!strcmp(subkey, "proxy")) {
 428                return git_config_string((const char **)&remote->http_proxy,
 429                                         key, value);
 430        } else if (!strcmp(subkey, "proxyauthmethod")) {
 431                return git_config_string((const char **)&remote->http_proxy_authmethod,
 432                                         key, value);
 433        } else if (!strcmp(subkey, "vcs")) {
 434                return git_config_string(&remote->foreign_vcs, key, value);
 435        }
 436        return 0;
 437}
 438
 439static void alias_all_urls(void)
 440{
 441        int i, j;
 442        for (i = 0; i < remotes_nr; i++) {
 443                int add_pushurl_aliases;
 444                if (!remotes[i])
 445                        continue;
 446                for (j = 0; j < remotes[i]->pushurl_nr; j++) {
 447                        remotes[i]->pushurl[j] = alias_url(remotes[i]->pushurl[j], &rewrites);
 448                }
 449                add_pushurl_aliases = remotes[i]->pushurl_nr == 0;
 450                for (j = 0; j < remotes[i]->url_nr; j++) {
 451                        if (add_pushurl_aliases)
 452                                add_pushurl_alias(remotes[i], remotes[i]->url[j]);
 453                        remotes[i]->url[j] = alias_url(remotes[i]->url[j], &rewrites);
 454                }
 455        }
 456}
 457
 458static void read_config(void)
 459{
 460        static int loaded;
 461        struct object_id oid;
 462        int flag;
 463
 464        if (loaded)
 465                return;
 466        loaded = 1;
 467
 468        current_branch = NULL;
 469        if (startup_info->have_repository) {
 470                const char *head_ref = resolve_ref_unsafe("HEAD", 0, oid.hash, &flag);
 471                if (head_ref && (flag & REF_ISSYMREF) &&
 472                    skip_prefix(head_ref, "refs/heads/", &head_ref)) {
 473                        current_branch = make_branch(head_ref, 0);
 474                }
 475        }
 476        git_config(handle_config, NULL);
 477        alias_all_urls();
 478}
 479
 480/*
 481 * This function frees a refspec array.
 482 * Warning: code paths should be checked to ensure that the src
 483 *          and dst pointers are always freeable pointers as well
 484 *          as the refspec pointer itself.
 485 */
 486static void free_refspecs(struct refspec *refspec, int nr_refspec)
 487{
 488        int i;
 489
 490        if (!refspec)
 491                return;
 492
 493        for (i = 0; i < nr_refspec; i++) {
 494                free(refspec[i].src);
 495                free(refspec[i].dst);
 496        }
 497        free(refspec);
 498}
 499
 500static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
 501{
 502        int i;
 503        struct refspec *rs = xcalloc(nr_refspec, sizeof(*rs));
 504
 505        for (i = 0; i < nr_refspec; i++) {
 506                size_t llen;
 507                int is_glob;
 508                const char *lhs, *rhs;
 509                int flags;
 510
 511                is_glob = 0;
 512
 513                lhs = refspec[i];
 514                if (*lhs == '+') {
 515                        rs[i].force = 1;
 516                        lhs++;
 517                }
 518
 519                rhs = strrchr(lhs, ':');
 520
 521                /*
 522                 * Before going on, special case ":" (or "+:") as a refspec
 523                 * for pushing matching refs.
 524                 */
 525                if (!fetch && rhs == lhs && rhs[1] == '\0') {
 526                        rs[i].matching = 1;
 527                        continue;
 528                }
 529
 530                if (rhs) {
 531                        size_t rlen = strlen(++rhs);
 532                        is_glob = (1 <= rlen && strchr(rhs, '*'));
 533                        rs[i].dst = xstrndup(rhs, rlen);
 534                }
 535
 536                llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
 537                if (1 <= llen && memchr(lhs, '*', llen)) {
 538                        if ((rhs && !is_glob) || (!rhs && fetch))
 539                                goto invalid;
 540                        is_glob = 1;
 541                } else if (rhs && is_glob) {
 542                        goto invalid;
 543                }
 544
 545                rs[i].pattern = is_glob;
 546                rs[i].src = xstrndup(lhs, llen);
 547                flags = REFNAME_ALLOW_ONELEVEL | (is_glob ? REFNAME_REFSPEC_PATTERN : 0);
 548
 549                if (fetch) {
 550                        struct object_id unused;
 551
 552                        /* LHS */
 553                        if (!*rs[i].src)
 554                                ; /* empty is ok; it means "HEAD" */
 555                        else if (llen == GIT_SHA1_HEXSZ && !get_oid_hex(rs[i].src, &unused))
 556                                rs[i].exact_sha1 = 1; /* ok */
 557                        else if (!check_refname_format(rs[i].src, flags))
 558                                ; /* valid looking ref is ok */
 559                        else
 560                                goto invalid;
 561                        /* RHS */
 562                        if (!rs[i].dst)
 563                                ; /* missing is ok; it is the same as empty */
 564                        else if (!*rs[i].dst)
 565                                ; /* empty is ok; it means "do not store" */
 566                        else if (!check_refname_format(rs[i].dst, flags))
 567                                ; /* valid looking ref is ok */
 568                        else
 569                                goto invalid;
 570                } else {
 571                        /*
 572                         * LHS
 573                         * - empty is allowed; it means delete.
 574                         * - when wildcarded, it must be a valid looking ref.
 575                         * - otherwise, it must be an extended SHA-1, but
 576                         *   there is no existing way to validate this.
 577                         */
 578                        if (!*rs[i].src)
 579                                ; /* empty is ok */
 580                        else if (is_glob) {
 581                                if (check_refname_format(rs[i].src, flags))
 582                                        goto invalid;
 583                        }
 584                        else
 585                                ; /* anything goes, for now */
 586                        /*
 587                         * RHS
 588                         * - missing is allowed, but LHS then must be a
 589                         *   valid looking ref.
 590                         * - empty is not allowed.
 591                         * - otherwise it must be a valid looking ref.
 592                         */
 593                        if (!rs[i].dst) {
 594                                if (check_refname_format(rs[i].src, flags))
 595                                        goto invalid;
 596                        } else if (!*rs[i].dst) {
 597                                goto invalid;
 598                        } else {
 599                                if (check_refname_format(rs[i].dst, flags))
 600                                        goto invalid;
 601                        }
 602                }
 603        }
 604        return rs;
 605
 606 invalid:
 607        if (verify) {
 608                /*
 609                 * nr_refspec must be greater than zero and i must be valid
 610                 * since it is only possible to reach this point from within
 611                 * the for loop above.
 612                 */
 613                free_refspecs(rs, i+1);
 614                return NULL;
 615        }
 616        die("Invalid refspec '%s'", refspec[i]);
 617}
 618
 619int valid_fetch_refspec(const char *fetch_refspec_str)
 620{
 621        struct refspec *refspec;
 622
 623        refspec = parse_refspec_internal(1, &fetch_refspec_str, 1, 1);
 624        free_refspecs(refspec, 1);
 625        return !!refspec;
 626}
 627
 628struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec)
 629{
 630        return parse_refspec_internal(nr_refspec, refspec, 1, 0);
 631}
 632
 633struct refspec *parse_push_refspec(int nr_refspec, const char **refspec)
 634{
 635        return parse_refspec_internal(nr_refspec, refspec, 0, 0);
 636}
 637
 638void free_refspec(int nr_refspec, struct refspec *refspec)
 639{
 640        int i;
 641        for (i = 0; i < nr_refspec; i++) {
 642                free(refspec[i].src);
 643                free(refspec[i].dst);
 644        }
 645        free(refspec);
 646}
 647
 648static int valid_remote_nick(const char *name)
 649{
 650        if (!name[0] || is_dot_or_dotdot(name))
 651                return 0;
 652        return !strchr(name, '/'); /* no slash */
 653}
 654
 655const char *remote_for_branch(struct branch *branch, int *explicit)
 656{
 657        if (branch && branch->remote_name) {
 658                if (explicit)
 659                        *explicit = 1;
 660                return branch->remote_name;
 661        }
 662        if (explicit)
 663                *explicit = 0;
 664        return "origin";
 665}
 666
 667const char *pushremote_for_branch(struct branch *branch, int *explicit)
 668{
 669        if (branch && branch->pushremote_name) {
 670                if (explicit)
 671                        *explicit = 1;
 672                return branch->pushremote_name;
 673        }
 674        if (pushremote_name) {
 675                if (explicit)
 676                        *explicit = 1;
 677                return pushremote_name;
 678        }
 679        return remote_for_branch(branch, explicit);
 680}
 681
 682static struct remote *remote_get_1(const char *name,
 683                                   const char *(*get_default)(struct branch *, int *))
 684{
 685        struct remote *ret;
 686        int name_given = 0;
 687
 688        read_config();
 689
 690        if (name)
 691                name_given = 1;
 692        else
 693                name = get_default(current_branch, &name_given);
 694
 695        ret = make_remote(name, 0);
 696        if (valid_remote_nick(name) && have_git_dir()) {
 697                if (!valid_remote(ret))
 698                        read_remotes_file(ret);
 699                if (!valid_remote(ret))
 700                        read_branches_file(ret);
 701        }
 702        if (name_given && !valid_remote(ret))
 703                add_url_alias(ret, name);
 704        if (!valid_remote(ret))
 705                return NULL;
 706        ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
 707        ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
 708        return ret;
 709}
 710
 711struct remote *remote_get(const char *name)
 712{
 713        return remote_get_1(name, remote_for_branch);
 714}
 715
 716struct remote *pushremote_get(const char *name)
 717{
 718        return remote_get_1(name, pushremote_for_branch);
 719}
 720
 721int remote_is_configured(struct remote *remote, int in_repo)
 722{
 723        if (!remote)
 724                return 0;
 725        if (in_repo)
 726                return remote->configured_in_repo;
 727        return !!remote->origin;
 728}
 729
 730int for_each_remote(each_remote_fn fn, void *priv)
 731{
 732        int i, result = 0;
 733        read_config();
 734        for (i = 0; i < remotes_nr && !result; i++) {
 735                struct remote *r = remotes[i];
 736                if (!r)
 737                        continue;
 738                if (!r->fetch)
 739                        r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
 740                                                       r->fetch_refspec);
 741                if (!r->push)
 742                        r->push = parse_push_refspec(r->push_refspec_nr,
 743                                                     r->push_refspec);
 744                result = fn(r, priv);
 745        }
 746        return result;
 747}
 748
 749static void handle_duplicate(struct ref *ref1, struct ref *ref2)
 750{
 751        if (strcmp(ref1->name, ref2->name)) {
 752                if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
 753                    ref2->fetch_head_status != FETCH_HEAD_IGNORE) {
 754                        die(_("Cannot fetch both %s and %s to %s"),
 755                            ref1->name, ref2->name, ref2->peer_ref->name);
 756                } else if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
 757                           ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
 758                        warning(_("%s usually tracks %s, not %s"),
 759                                ref2->peer_ref->name, ref2->name, ref1->name);
 760                } else if (ref1->fetch_head_status == FETCH_HEAD_IGNORE &&
 761                           ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
 762                        die(_("%s tracks both %s and %s"),
 763                            ref2->peer_ref->name, ref1->name, ref2->name);
 764                } else {
 765                        /*
 766                         * This last possibility doesn't occur because
 767                         * FETCH_HEAD_IGNORE entries always appear at
 768                         * the end of the list.
 769                         */
 770                        die(_("Internal error"));
 771                }
 772        }
 773        free(ref2->peer_ref);
 774        free(ref2);
 775}
 776
 777struct ref *ref_remove_duplicates(struct ref *ref_map)
 778{
 779        struct string_list refs = STRING_LIST_INIT_NODUP;
 780        struct ref *retval = NULL;
 781        struct ref **p = &retval;
 782
 783        while (ref_map) {
 784                struct ref *ref = ref_map;
 785
 786                ref_map = ref_map->next;
 787                ref->next = NULL;
 788
 789                if (!ref->peer_ref) {
 790                        *p = ref;
 791                        p = &ref->next;
 792                } else {
 793                        struct string_list_item *item =
 794                                string_list_insert(&refs, ref->peer_ref->name);
 795
 796                        if (item->util) {
 797                                /* Entry already existed */
 798                                handle_duplicate((struct ref *)item->util, ref);
 799                        } else {
 800                                *p = ref;
 801                                p = &ref->next;
 802                                item->util = ref;
 803                        }
 804                }
 805        }
 806
 807        string_list_clear(&refs, 0);
 808        return retval;
 809}
 810
 811int remote_has_url(struct remote *remote, const char *url)
 812{
 813        int i;
 814        for (i = 0; i < remote->url_nr; i++) {
 815                if (!strcmp(remote->url[i], url))
 816                        return 1;
 817        }
 818        return 0;
 819}
 820
 821static int match_name_with_pattern(const char *key, const char *name,
 822                                   const char *value, char **result)
 823{
 824        const char *kstar = strchr(key, '*');
 825        size_t klen;
 826        size_t ksuffixlen;
 827        size_t namelen;
 828        int ret;
 829        if (!kstar)
 830                die("Key '%s' of pattern had no '*'", key);
 831        klen = kstar - key;
 832        ksuffixlen = strlen(kstar + 1);
 833        namelen = strlen(name);
 834        ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
 835                !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
 836        if (ret && value) {
 837                struct strbuf sb = STRBUF_INIT;
 838                const char *vstar = strchr(value, '*');
 839                if (!vstar)
 840                        die("Value '%s' of pattern has no '*'", value);
 841                strbuf_add(&sb, value, vstar - value);
 842                strbuf_add(&sb, name + klen, namelen - klen - ksuffixlen);
 843                strbuf_addstr(&sb, vstar + 1);
 844                *result = strbuf_detach(&sb, NULL);
 845        }
 846        return ret;
 847}
 848
 849static void query_refspecs_multiple(struct refspec *refs, int ref_count, struct refspec *query, struct string_list *results)
 850{
 851        int i;
 852        int find_src = !query->src;
 853
 854        if (find_src && !query->dst)
 855                error("query_refspecs_multiple: need either src or dst");
 856
 857        for (i = 0; i < ref_count; i++) {
 858                struct refspec *refspec = &refs[i];
 859                const char *key = find_src ? refspec->dst : refspec->src;
 860                const char *value = find_src ? refspec->src : refspec->dst;
 861                const char *needle = find_src ? query->dst : query->src;
 862                char **result = find_src ? &query->src : &query->dst;
 863
 864                if (!refspec->dst)
 865                        continue;
 866                if (refspec->pattern) {
 867                        if (match_name_with_pattern(key, needle, value, result))
 868                                string_list_append_nodup(results, *result);
 869                } else if (!strcmp(needle, key)) {
 870                        string_list_append(results, value);
 871                }
 872        }
 873}
 874
 875int query_refspecs(struct refspec *refs, int ref_count, struct refspec *query)
 876{
 877        int i;
 878        int find_src = !query->src;
 879        const char *needle = find_src ? query->dst : query->src;
 880        char **result = find_src ? &query->src : &query->dst;
 881
 882        if (find_src && !query->dst)
 883                return error("query_refspecs: need either src or dst");
 884
 885        for (i = 0; i < ref_count; i++) {
 886                struct refspec *refspec = &refs[i];
 887                const char *key = find_src ? refspec->dst : refspec->src;
 888                const char *value = find_src ? refspec->src : refspec->dst;
 889
 890                if (!refspec->dst)
 891                        continue;
 892                if (refspec->pattern) {
 893                        if (match_name_with_pattern(key, needle, value, result)) {
 894                                query->force = refspec->force;
 895                                return 0;
 896                        }
 897                } else if (!strcmp(needle, key)) {
 898                        *result = xstrdup(value);
 899                        query->force = refspec->force;
 900                        return 0;
 901                }
 902        }
 903        return -1;
 904}
 905
 906char *apply_refspecs(struct refspec *refspecs, int nr_refspec,
 907                     const char *name)
 908{
 909        struct refspec query;
 910
 911        memset(&query, 0, sizeof(struct refspec));
 912        query.src = (char *)name;
 913
 914        if (query_refspecs(refspecs, nr_refspec, &query))
 915                return NULL;
 916
 917        return query.dst;
 918}
 919
 920int remote_find_tracking(struct remote *remote, struct refspec *refspec)
 921{
 922        return query_refspecs(remote->fetch, remote->fetch_refspec_nr, refspec);
 923}
 924
 925static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
 926                const char *name)
 927{
 928        size_t len = strlen(name);
 929        struct ref *ref = xcalloc(1, st_add4(sizeof(*ref), prefixlen, len, 1));
 930        memcpy(ref->name, prefix, prefixlen);
 931        memcpy(ref->name + prefixlen, name, len);
 932        return ref;
 933}
 934
 935struct ref *alloc_ref(const char *name)
 936{
 937        return alloc_ref_with_prefix("", 0, name);
 938}
 939
 940struct ref *copy_ref(const struct ref *ref)
 941{
 942        struct ref *cpy;
 943        size_t len;
 944        if (!ref)
 945                return NULL;
 946        len = st_add3(sizeof(struct ref), strlen(ref->name), 1);
 947        cpy = xmalloc(len);
 948        memcpy(cpy, ref, len);
 949        cpy->next = NULL;
 950        cpy->symref = xstrdup_or_null(ref->symref);
 951        cpy->remote_status = xstrdup_or_null(ref->remote_status);
 952        cpy->peer_ref = copy_ref(ref->peer_ref);
 953        return cpy;
 954}
 955
 956struct ref *copy_ref_list(const struct ref *ref)
 957{
 958        struct ref *ret = NULL;
 959        struct ref **tail = &ret;
 960        while (ref) {
 961                *tail = copy_ref(ref);
 962                ref = ref->next;
 963                tail = &((*tail)->next);
 964        }
 965        return ret;
 966}
 967
 968static void free_ref(struct ref *ref)
 969{
 970        if (!ref)
 971                return;
 972        free_ref(ref->peer_ref);
 973        free(ref->remote_status);
 974        free(ref->symref);
 975        free(ref);
 976}
 977
 978void free_refs(struct ref *ref)
 979{
 980        struct ref *next;
 981        while (ref) {
 982                next = ref->next;
 983                free_ref(ref);
 984                ref = next;
 985        }
 986}
 987
 988int ref_compare_name(const void *va, const void *vb)
 989{
 990        const struct ref *a = va, *b = vb;
 991        return strcmp(a->name, b->name);
 992}
 993
 994static void *ref_list_get_next(const void *a)
 995{
 996        return ((const struct ref *)a)->next;
 997}
 998
 999static void ref_list_set_next(void *a, void *next)
1000{
1001        ((struct ref *)a)->next = next;
1002}
1003
1004void sort_ref_list(struct ref **l, int (*cmp)(const void *, const void *))
1005{
1006        *l = llist_mergesort(*l, ref_list_get_next, ref_list_set_next, cmp);
1007}
1008
1009int count_refspec_match(const char *pattern,
1010                        struct ref *refs,
1011                        struct ref **matched_ref)
1012{
1013        int patlen = strlen(pattern);
1014        struct ref *matched_weak = NULL;
1015        struct ref *matched = NULL;
1016        int weak_match = 0;
1017        int match = 0;
1018
1019        for (weak_match = match = 0; refs; refs = refs->next) {
1020                char *name = refs->name;
1021                int namelen = strlen(name);
1022
1023                if (!refname_match(pattern, name))
1024                        continue;
1025
1026                /* A match is "weak" if it is with refs outside
1027                 * heads or tags, and did not specify the pattern
1028                 * in full (e.g. "refs/remotes/origin/master") or at
1029                 * least from the toplevel (e.g. "remotes/origin/master");
1030                 * otherwise "git push $URL master" would result in
1031                 * ambiguity between remotes/origin/master and heads/master
1032                 * at the remote site.
1033                 */
1034                if (namelen != patlen &&
1035                    patlen != namelen - 5 &&
1036                    !starts_with(name, "refs/heads/") &&
1037                    !starts_with(name, "refs/tags/")) {
1038                        /* We want to catch the case where only weak
1039                         * matches are found and there are multiple
1040                         * matches, and where more than one strong
1041                         * matches are found, as ambiguous.  One
1042                         * strong match with zero or more weak matches
1043                         * are acceptable as a unique match.
1044                         */
1045                        matched_weak = refs;
1046                        weak_match++;
1047                }
1048                else {
1049                        matched = refs;
1050                        match++;
1051                }
1052        }
1053        if (!matched) {
1054                if (matched_ref)
1055                        *matched_ref = matched_weak;
1056                return weak_match;
1057        }
1058        else {
1059                if (matched_ref)
1060                        *matched_ref = matched;
1061                return match;
1062        }
1063}
1064
1065static void tail_link_ref(struct ref *ref, struct ref ***tail)
1066{
1067        **tail = ref;
1068        while (ref->next)
1069                ref = ref->next;
1070        *tail = &ref->next;
1071}
1072
1073static struct ref *alloc_delete_ref(void)
1074{
1075        struct ref *ref = alloc_ref("(delete)");
1076        oidclr(&ref->new_oid);
1077        return ref;
1078}
1079
1080static int try_explicit_object_name(const char *name,
1081                                    struct ref **match)
1082{
1083        struct object_id oid;
1084
1085        if (!*name) {
1086                if (match)
1087                        *match = alloc_delete_ref();
1088                return 0;
1089        }
1090
1091        if (get_sha1(name, oid.hash))
1092                return -1;
1093
1094        if (match) {
1095                *match = alloc_ref(name);
1096                oidcpy(&(*match)->new_oid, &oid);
1097        }
1098        return 0;
1099}
1100
1101static struct ref *make_linked_ref(const char *name, struct ref ***tail)
1102{
1103        struct ref *ret = alloc_ref(name);
1104        tail_link_ref(ret, tail);
1105        return ret;
1106}
1107
1108static char *guess_ref(const char *name, struct ref *peer)
1109{
1110        struct strbuf buf = STRBUF_INIT;
1111        struct object_id oid;
1112
1113        const char *r = resolve_ref_unsafe(peer->name, RESOLVE_REF_READING,
1114                                           oid.hash, NULL);
1115        if (!r)
1116                return NULL;
1117
1118        if (starts_with(r, "refs/heads/"))
1119                strbuf_addstr(&buf, "refs/heads/");
1120        else if (starts_with(r, "refs/tags/"))
1121                strbuf_addstr(&buf, "refs/tags/");
1122        else
1123                return NULL;
1124
1125        strbuf_addstr(&buf, name);
1126        return strbuf_detach(&buf, NULL);
1127}
1128
1129static int match_explicit_lhs(struct ref *src,
1130                              struct refspec *rs,
1131                              struct ref **match,
1132                              int *allocated_match)
1133{
1134        switch (count_refspec_match(rs->src, src, match)) {
1135        case 1:
1136                if (allocated_match)
1137                        *allocated_match = 0;
1138                return 0;
1139        case 0:
1140                /* The source could be in the get_sha1() format
1141                 * not a reference name.  :refs/other is a
1142                 * way to delete 'other' ref at the remote end.
1143                 */
1144                if (try_explicit_object_name(rs->src, match) < 0)
1145                        return error("src refspec %s does not match any.", rs->src);
1146                if (allocated_match)
1147                        *allocated_match = 1;
1148                return 0;
1149        default:
1150                return error("src refspec %s matches more than one.", rs->src);
1151        }
1152}
1153
1154static int match_explicit(struct ref *src, struct ref *dst,
1155                          struct ref ***dst_tail,
1156                          struct refspec *rs)
1157{
1158        struct ref *matched_src, *matched_dst;
1159        int allocated_src;
1160
1161        const char *dst_value = rs->dst;
1162        char *dst_guess;
1163
1164        if (rs->pattern || rs->matching)
1165                return 0;
1166
1167        matched_src = matched_dst = NULL;
1168        if (match_explicit_lhs(src, rs, &matched_src, &allocated_src) < 0)
1169                return -1;
1170
1171        if (!dst_value) {
1172                struct object_id oid;
1173                int flag;
1174
1175                dst_value = resolve_ref_unsafe(matched_src->name,
1176                                               RESOLVE_REF_READING,
1177                                               oid.hash, &flag);
1178                if (!dst_value ||
1179                    ((flag & REF_ISSYMREF) &&
1180                     !starts_with(dst_value, "refs/heads/")))
1181                        die("%s cannot be resolved to branch.",
1182                            matched_src->name);
1183        }
1184
1185        switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1186        case 1:
1187                break;
1188        case 0:
1189                if (starts_with(dst_value, "refs/"))
1190                        matched_dst = make_linked_ref(dst_value, dst_tail);
1191                else if (is_null_oid(&matched_src->new_oid))
1192                        error("unable to delete '%s': remote ref does not exist",
1193                              dst_value);
1194                else if ((dst_guess = guess_ref(dst_value, matched_src)))
1195                        matched_dst = make_linked_ref(dst_guess, dst_tail);
1196                else
1197                        error("unable to push to unqualified destination: %s\n"
1198                              "The destination refspec neither matches an "
1199                              "existing ref on the remote nor\n"
1200                              "begins with refs/, and we are unable to "
1201                              "guess a prefix based on the source ref.",
1202                              dst_value);
1203                break;
1204        default:
1205                matched_dst = NULL;
1206                error("dst refspec %s matches more than one.",
1207                      dst_value);
1208                break;
1209        }
1210        if (!matched_dst)
1211                return -1;
1212        if (matched_dst->peer_ref)
1213                return error("dst ref %s receives from more than one src.",
1214                      matched_dst->name);
1215        else {
1216                matched_dst->peer_ref = allocated_src ?
1217                                        matched_src :
1218                                        copy_ref(matched_src);
1219                matched_dst->force = rs->force;
1220        }
1221        return 0;
1222}
1223
1224static int match_explicit_refs(struct ref *src, struct ref *dst,
1225                               struct ref ***dst_tail, struct refspec *rs,
1226                               int rs_nr)
1227{
1228        int i, errs;
1229        for (i = errs = 0; i < rs_nr; i++)
1230                errs += match_explicit(src, dst, dst_tail, &rs[i]);
1231        return errs;
1232}
1233
1234static char *get_ref_match(const struct refspec *rs, int rs_nr, const struct ref *ref,
1235                int send_mirror, int direction, const struct refspec **ret_pat)
1236{
1237        const struct refspec *pat;
1238        char *name;
1239        int i;
1240        int matching_refs = -1;
1241        for (i = 0; i < rs_nr; i++) {
1242                if (rs[i].matching &&
1243                    (matching_refs == -1 || rs[i].force)) {
1244                        matching_refs = i;
1245                        continue;
1246                }
1247
1248                if (rs[i].pattern) {
1249                        const char *dst_side = rs[i].dst ? rs[i].dst : rs[i].src;
1250                        int match;
1251                        if (direction == FROM_SRC)
1252                                match = match_name_with_pattern(rs[i].src, ref->name, dst_side, &name);
1253                        else
1254                                match = match_name_with_pattern(dst_side, ref->name, rs[i].src, &name);
1255                        if (match) {
1256                                matching_refs = i;
1257                                break;
1258                        }
1259                }
1260        }
1261        if (matching_refs == -1)
1262                return NULL;
1263
1264        pat = rs + matching_refs;
1265        if (pat->matching) {
1266                /*
1267                 * "matching refs"; traditionally we pushed everything
1268                 * including refs outside refs/heads/ hierarchy, but
1269                 * that does not make much sense these days.
1270                 */
1271                if (!send_mirror && !starts_with(ref->name, "refs/heads/"))
1272                        return NULL;
1273                name = xstrdup(ref->name);
1274        }
1275        if (ret_pat)
1276                *ret_pat = pat;
1277        return name;
1278}
1279
1280static struct ref **tail_ref(struct ref **head)
1281{
1282        struct ref **tail = head;
1283        while (*tail)
1284                tail = &((*tail)->next);
1285        return tail;
1286}
1287
1288struct tips {
1289        struct commit **tip;
1290        int nr, alloc;
1291};
1292
1293static void add_to_tips(struct tips *tips, const struct object_id *oid)
1294{
1295        struct commit *commit;
1296
1297        if (is_null_oid(oid))
1298                return;
1299        commit = lookup_commit_reference_gently(oid->hash, 1);
1300        if (!commit || (commit->object.flags & TMP_MARK))
1301                return;
1302        commit->object.flags |= TMP_MARK;
1303        ALLOC_GROW(tips->tip, tips->nr + 1, tips->alloc);
1304        tips->tip[tips->nr++] = commit;
1305}
1306
1307static void add_missing_tags(struct ref *src, struct ref **dst, struct ref ***dst_tail)
1308{
1309        struct string_list dst_tag = STRING_LIST_INIT_NODUP;
1310        struct string_list src_tag = STRING_LIST_INIT_NODUP;
1311        struct string_list_item *item;
1312        struct ref *ref;
1313        struct tips sent_tips;
1314
1315        /*
1316         * Collect everything we know they would have at the end of
1317         * this push, and collect all tags they have.
1318         */
1319        memset(&sent_tips, 0, sizeof(sent_tips));
1320        for (ref = *dst; ref; ref = ref->next) {
1321                if (ref->peer_ref &&
1322                    !is_null_oid(&ref->peer_ref->new_oid))
1323                        add_to_tips(&sent_tips, &ref->peer_ref->new_oid);
1324                else
1325                        add_to_tips(&sent_tips, &ref->old_oid);
1326                if (starts_with(ref->name, "refs/tags/"))
1327                        string_list_append(&dst_tag, ref->name);
1328        }
1329        clear_commit_marks_many(sent_tips.nr, sent_tips.tip, TMP_MARK);
1330
1331        string_list_sort(&dst_tag);
1332
1333        /* Collect tags they do not have. */
1334        for (ref = src; ref; ref = ref->next) {
1335                if (!starts_with(ref->name, "refs/tags/"))
1336                        continue; /* not a tag */
1337                if (string_list_has_string(&dst_tag, ref->name))
1338                        continue; /* they already have it */
1339                if (sha1_object_info(ref->new_oid.hash, NULL) != OBJ_TAG)
1340                        continue; /* be conservative */
1341                item = string_list_append(&src_tag, ref->name);
1342                item->util = ref;
1343        }
1344        string_list_clear(&dst_tag, 0);
1345
1346        /*
1347         * At this point, src_tag lists tags that are missing from
1348         * dst, and sent_tips lists the tips we are pushing or those
1349         * that we know they already have. An element in the src_tag
1350         * that is an ancestor of any of the sent_tips needs to be
1351         * sent to the other side.
1352         */
1353        if (sent_tips.nr) {
1354                for_each_string_list_item(item, &src_tag) {
1355                        struct ref *ref = item->util;
1356                        struct ref *dst_ref;
1357                        struct commit *commit;
1358
1359                        if (is_null_oid(&ref->new_oid))
1360                                continue;
1361                        commit = lookup_commit_reference_gently(ref->new_oid.hash, 1);
1362                        if (!commit)
1363                                /* not pushing a commit, which is not an error */
1364                                continue;
1365
1366                        /*
1367                         * Is this tag, which they do not have, reachable from
1368                         * any of the commits we are sending?
1369                         */
1370                        if (!in_merge_bases_many(commit, sent_tips.nr, sent_tips.tip))
1371                                continue;
1372
1373                        /* Add it in */
1374                        dst_ref = make_linked_ref(ref->name, dst_tail);
1375                        oidcpy(&dst_ref->new_oid, &ref->new_oid);
1376                        dst_ref->peer_ref = copy_ref(ref);
1377                }
1378        }
1379        string_list_clear(&src_tag, 0);
1380        free(sent_tips.tip);
1381}
1382
1383struct ref *find_ref_by_name(const struct ref *list, const char *name)
1384{
1385        for ( ; list; list = list->next)
1386                if (!strcmp(list->name, name))
1387                        return (struct ref *)list;
1388        return NULL;
1389}
1390
1391static void prepare_ref_index(struct string_list *ref_index, struct ref *ref)
1392{
1393        for ( ; ref; ref = ref->next)
1394                string_list_append_nodup(ref_index, ref->name)->util = ref;
1395
1396        string_list_sort(ref_index);
1397}
1398
1399/*
1400 * Given only the set of local refs, sanity-check the set of push
1401 * refspecs. We can't catch all errors that match_push_refs would,
1402 * but we can catch some errors early before even talking to the
1403 * remote side.
1404 */
1405int check_push_refs(struct ref *src, int nr_refspec, const char **refspec_names)
1406{
1407        struct refspec *refspec = parse_push_refspec(nr_refspec, refspec_names);
1408        int ret = 0;
1409        int i;
1410
1411        for (i = 0; i < nr_refspec; i++) {
1412                struct refspec *rs = refspec + i;
1413
1414                if (rs->pattern || rs->matching)
1415                        continue;
1416
1417                ret |= match_explicit_lhs(src, rs, NULL, NULL);
1418        }
1419
1420        free_refspec(nr_refspec, refspec);
1421        return ret;
1422}
1423
1424/*
1425 * Given the set of refs the local repository has, the set of refs the
1426 * remote repository has, and the refspec used for push, determine
1427 * what remote refs we will update and with what value by setting
1428 * peer_ref (which object is being pushed) and force (if the push is
1429 * forced) in elements of "dst". The function may add new elements to
1430 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
1431 */
1432int match_push_refs(struct ref *src, struct ref **dst,
1433                    int nr_refspec, const char **refspec, int flags)
1434{
1435        struct refspec *rs;
1436        int send_all = flags & MATCH_REFS_ALL;
1437        int send_mirror = flags & MATCH_REFS_MIRROR;
1438        int send_prune = flags & MATCH_REFS_PRUNE;
1439        int errs;
1440        static const char *default_refspec[] = { ":", NULL };
1441        struct ref *ref, **dst_tail = tail_ref(dst);
1442        struct string_list dst_ref_index = STRING_LIST_INIT_NODUP;
1443
1444        if (!nr_refspec) {
1445                nr_refspec = 1;
1446                refspec = default_refspec;
1447        }
1448        rs = parse_push_refspec(nr_refspec, (const char **) refspec);
1449        errs = match_explicit_refs(src, *dst, &dst_tail, rs, nr_refspec);
1450
1451        /* pick the remainder */
1452        for (ref = src; ref; ref = ref->next) {
1453                struct string_list_item *dst_item;
1454                struct ref *dst_peer;
1455                const struct refspec *pat = NULL;
1456                char *dst_name;
1457
1458                dst_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_SRC, &pat);
1459                if (!dst_name)
1460                        continue;
1461
1462                if (!dst_ref_index.nr)
1463                        prepare_ref_index(&dst_ref_index, *dst);
1464
1465                dst_item = string_list_lookup(&dst_ref_index, dst_name);
1466                dst_peer = dst_item ? dst_item->util : NULL;
1467                if (dst_peer) {
1468                        if (dst_peer->peer_ref)
1469                                /* We're already sending something to this ref. */
1470                                goto free_name;
1471                } else {
1472                        if (pat->matching && !(send_all || send_mirror))
1473                                /*
1474                                 * Remote doesn't have it, and we have no
1475                                 * explicit pattern, and we don't have
1476                                 * --all or --mirror.
1477                                 */
1478                                goto free_name;
1479
1480                        /* Create a new one and link it */
1481                        dst_peer = make_linked_ref(dst_name, &dst_tail);
1482                        oidcpy(&dst_peer->new_oid, &ref->new_oid);
1483                        string_list_insert(&dst_ref_index,
1484                                dst_peer->name)->util = dst_peer;
1485                }
1486                dst_peer->peer_ref = copy_ref(ref);
1487                dst_peer->force = pat->force;
1488        free_name:
1489                free(dst_name);
1490        }
1491
1492        string_list_clear(&dst_ref_index, 0);
1493
1494        if (flags & MATCH_REFS_FOLLOW_TAGS)
1495                add_missing_tags(src, dst, &dst_tail);
1496
1497        if (send_prune) {
1498                struct string_list src_ref_index = STRING_LIST_INIT_NODUP;
1499                /* check for missing refs on the remote */
1500                for (ref = *dst; ref; ref = ref->next) {
1501                        char *src_name;
1502
1503                        if (ref->peer_ref)
1504                                /* We're already sending something to this ref. */
1505                                continue;
1506
1507                        src_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_DST, NULL);
1508                        if (src_name) {
1509                                if (!src_ref_index.nr)
1510                                        prepare_ref_index(&src_ref_index, src);
1511                                if (!string_list_has_string(&src_ref_index,
1512                                            src_name))
1513                                        ref->peer_ref = alloc_delete_ref();
1514                                free(src_name);
1515                        }
1516                }
1517                string_list_clear(&src_ref_index, 0);
1518        }
1519        if (errs)
1520                return -1;
1521        return 0;
1522}
1523
1524void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1525                             int force_update)
1526{
1527        struct ref *ref;
1528
1529        for (ref = remote_refs; ref; ref = ref->next) {
1530                int force_ref_update = ref->force || force_update;
1531                int reject_reason = 0;
1532
1533                if (ref->peer_ref)
1534                        oidcpy(&ref->new_oid, &ref->peer_ref->new_oid);
1535                else if (!send_mirror)
1536                        continue;
1537
1538                ref->deletion = is_null_oid(&ref->new_oid);
1539                if (!ref->deletion &&
1540                        !oidcmp(&ref->old_oid, &ref->new_oid)) {
1541                        ref->status = REF_STATUS_UPTODATE;
1542                        continue;
1543                }
1544
1545                /*
1546                 * If the remote ref has moved and is now different
1547                 * from what we expect, reject any push.
1548                 *
1549                 * It also is an error if the user told us to check
1550                 * with the remote-tracking branch to find the value
1551                 * to expect, but we did not have such a tracking
1552                 * branch.
1553                 */
1554                if (ref->expect_old_sha1) {
1555                        if (oidcmp(&ref->old_oid, &ref->old_oid_expect))
1556                                reject_reason = REF_STATUS_REJECT_STALE;
1557                        else
1558                                /* If the ref isn't stale then force the update. */
1559                                force_ref_update = 1;
1560                }
1561
1562                /*
1563                 * If the update isn't already rejected then check
1564                 * the usual "must fast-forward" rules.
1565                 *
1566                 * Decide whether an individual refspec A:B can be
1567                 * pushed.  The push will succeed if any of the
1568                 * following are true:
1569                 *
1570                 * (1) the remote reference B does not exist
1571                 *
1572                 * (2) the remote reference B is being removed (i.e.,
1573                 *     pushing :B where no source is specified)
1574                 *
1575                 * (3) the destination is not under refs/tags/, and
1576                 *     if the old and new value is a commit, the new
1577                 *     is a descendant of the old.
1578                 *
1579                 * (4) it is forced using the +A:B notation, or by
1580                 *     passing the --force argument
1581                 */
1582
1583                if (!reject_reason && !ref->deletion && !is_null_oid(&ref->old_oid)) {
1584                        if (starts_with(ref->name, "refs/tags/"))
1585                                reject_reason = REF_STATUS_REJECT_ALREADY_EXISTS;
1586                        else if (!has_object_file(&ref->old_oid))
1587                                reject_reason = REF_STATUS_REJECT_FETCH_FIRST;
1588                        else if (!lookup_commit_reference_gently(ref->old_oid.hash, 1) ||
1589                                 !lookup_commit_reference_gently(ref->new_oid.hash, 1))
1590                                reject_reason = REF_STATUS_REJECT_NEEDS_FORCE;
1591                        else if (!ref_newer(&ref->new_oid, &ref->old_oid))
1592                                reject_reason = REF_STATUS_REJECT_NONFASTFORWARD;
1593                }
1594
1595                /*
1596                 * "--force" will defeat any rejection implemented
1597                 * by the rules above.
1598                 */
1599                if (!force_ref_update)
1600                        ref->status = reject_reason;
1601                else if (reject_reason)
1602                        ref->forced_update = 1;
1603        }
1604}
1605
1606static void set_merge(struct branch *ret)
1607{
1608        struct remote *remote;
1609        char *ref;
1610        struct object_id oid;
1611        int i;
1612
1613        if (!ret)
1614                return; /* no branch */
1615        if (ret->merge)
1616                return; /* already run */
1617        if (!ret->remote_name || !ret->merge_nr) {
1618                /*
1619                 * no merge config; let's make sure we don't confuse callers
1620                 * with a non-zero merge_nr but a NULL merge
1621                 */
1622                ret->merge_nr = 0;
1623                return;
1624        }
1625
1626        remote = remote_get(ret->remote_name);
1627
1628        ret->merge = xcalloc(ret->merge_nr, sizeof(*ret->merge));
1629        for (i = 0; i < ret->merge_nr; i++) {
1630                ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1631                ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1632                if (!remote_find_tracking(remote, ret->merge[i]) ||
1633                    strcmp(ret->remote_name, "."))
1634                        continue;
1635                if (dwim_ref(ret->merge_name[i], strlen(ret->merge_name[i]),
1636                             oid.hash, &ref) == 1)
1637                        ret->merge[i]->dst = ref;
1638                else
1639                        ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1640        }
1641}
1642
1643struct branch *branch_get(const char *name)
1644{
1645        struct branch *ret;
1646
1647        read_config();
1648        if (!name || !*name || !strcmp(name, "HEAD"))
1649                ret = current_branch;
1650        else
1651                ret = make_branch(name, 0);
1652        set_merge(ret);
1653        return ret;
1654}
1655
1656int branch_has_merge_config(struct branch *branch)
1657{
1658        return branch && !!branch->merge;
1659}
1660
1661int branch_merge_matches(struct branch *branch,
1662                                 int i,
1663                                 const char *refname)
1664{
1665        if (!branch || i < 0 || i >= branch->merge_nr)
1666                return 0;
1667        return refname_match(branch->merge[i]->src, refname);
1668}
1669
1670__attribute__((format (printf,2,3)))
1671static const char *error_buf(struct strbuf *err, const char *fmt, ...)
1672{
1673        if (err) {
1674                va_list ap;
1675                va_start(ap, fmt);
1676                strbuf_vaddf(err, fmt, ap);
1677                va_end(ap);
1678        }
1679        return NULL;
1680}
1681
1682const char *branch_get_upstream(struct branch *branch, struct strbuf *err)
1683{
1684        if (!branch)
1685                return error_buf(err, _("HEAD does not point to a branch"));
1686
1687        if (!branch->merge || !branch->merge[0]) {
1688                /*
1689                 * no merge config; is it because the user didn't define any,
1690                 * or because it is not a real branch, and get_branch
1691                 * auto-vivified it?
1692                 */
1693                if (!ref_exists(branch->refname))
1694                        return error_buf(err, _("no such branch: '%s'"),
1695                                         branch->name);
1696                return error_buf(err,
1697                                 _("no upstream configured for branch '%s'"),
1698                                 branch->name);
1699        }
1700
1701        if (!branch->merge[0]->dst)
1702                return error_buf(err,
1703                                 _("upstream branch '%s' not stored as a remote-tracking branch"),
1704                                 branch->merge[0]->src);
1705
1706        return branch->merge[0]->dst;
1707}
1708
1709static const char *tracking_for_push_dest(struct remote *remote,
1710                                          const char *refname,
1711                                          struct strbuf *err)
1712{
1713        char *ret;
1714
1715        ret = apply_refspecs(remote->fetch, remote->fetch_refspec_nr, refname);
1716        if (!ret)
1717                return error_buf(err,
1718                                 _("push destination '%s' on remote '%s' has no local tracking branch"),
1719                                 refname, remote->name);
1720        return ret;
1721}
1722
1723static const char *branch_get_push_1(struct branch *branch, struct strbuf *err)
1724{
1725        struct remote *remote;
1726
1727        remote = remote_get(pushremote_for_branch(branch, NULL));
1728        if (!remote)
1729                return error_buf(err,
1730                                 _("branch '%s' has no remote for pushing"),
1731                                 branch->name);
1732
1733        if (remote->push_refspec_nr) {
1734                char *dst;
1735                const char *ret;
1736
1737                dst = apply_refspecs(remote->push, remote->push_refspec_nr,
1738                                     branch->refname);
1739                if (!dst)
1740                        return error_buf(err,
1741                                         _("push refspecs for '%s' do not include '%s'"),
1742                                         remote->name, branch->name);
1743
1744                ret = tracking_for_push_dest(remote, dst, err);
1745                free(dst);
1746                return ret;
1747        }
1748
1749        if (remote->mirror)
1750                return tracking_for_push_dest(remote, branch->refname, err);
1751
1752        switch (push_default) {
1753        case PUSH_DEFAULT_NOTHING:
1754                return error_buf(err, _("push has no destination (push.default is 'nothing')"));
1755
1756        case PUSH_DEFAULT_MATCHING:
1757        case PUSH_DEFAULT_CURRENT:
1758                return tracking_for_push_dest(remote, branch->refname, err);
1759
1760        case PUSH_DEFAULT_UPSTREAM:
1761                return branch_get_upstream(branch, err);
1762
1763        case PUSH_DEFAULT_UNSPECIFIED:
1764        case PUSH_DEFAULT_SIMPLE:
1765                {
1766                        const char *up, *cur;
1767
1768                        up = branch_get_upstream(branch, err);
1769                        if (!up)
1770                                return NULL;
1771                        cur = tracking_for_push_dest(remote, branch->refname, err);
1772                        if (!cur)
1773                                return NULL;
1774                        if (strcmp(cur, up))
1775                                return error_buf(err,
1776                                                 _("cannot resolve 'simple' push to a single destination"));
1777                        return cur;
1778                }
1779        }
1780
1781        die("BUG: unhandled push situation");
1782}
1783
1784const char *branch_get_push(struct branch *branch, struct strbuf *err)
1785{
1786        if (!branch)
1787                return error_buf(err, _("HEAD does not point to a branch"));
1788
1789        if (!branch->push_tracking_ref)
1790                branch->push_tracking_ref = branch_get_push_1(branch, err);
1791        return branch->push_tracking_ref;
1792}
1793
1794static int ignore_symref_update(const char *refname)
1795{
1796        struct object_id oid;
1797        int flag;
1798
1799        if (!resolve_ref_unsafe(refname, 0, oid.hash, &flag))
1800                return 0; /* non-existing refs are OK */
1801        return (flag & REF_ISSYMREF);
1802}
1803
1804/*
1805 * Create and return a list of (struct ref) consisting of copies of
1806 * each remote_ref that matches refspec.  refspec must be a pattern.
1807 * Fill in the copies' peer_ref to describe the local tracking refs to
1808 * which they map.  Omit any references that would map to an existing
1809 * local symbolic ref.
1810 */
1811static struct ref *get_expanded_map(const struct ref *remote_refs,
1812                                    const struct refspec *refspec)
1813{
1814        const struct ref *ref;
1815        struct ref *ret = NULL;
1816        struct ref **tail = &ret;
1817
1818        for (ref = remote_refs; ref; ref = ref->next) {
1819                char *expn_name = NULL;
1820
1821                if (strchr(ref->name, '^'))
1822                        continue; /* a dereference item */
1823                if (match_name_with_pattern(refspec->src, ref->name,
1824                                            refspec->dst, &expn_name) &&
1825                    !ignore_symref_update(expn_name)) {
1826                        struct ref *cpy = copy_ref(ref);
1827
1828                        cpy->peer_ref = alloc_ref(expn_name);
1829                        if (refspec->force)
1830                                cpy->peer_ref->force = 1;
1831                        *tail = cpy;
1832                        tail = &cpy->next;
1833                }
1834                free(expn_name);
1835        }
1836
1837        return ret;
1838}
1839
1840static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1841{
1842        const struct ref *ref;
1843        for (ref = refs; ref; ref = ref->next) {
1844                if (refname_match(name, ref->name))
1845                        return ref;
1846        }
1847        return NULL;
1848}
1849
1850struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1851{
1852        const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1853
1854        if (!ref)
1855                return NULL;
1856
1857        return copy_ref(ref);
1858}
1859
1860static struct ref *get_local_ref(const char *name)
1861{
1862        if (!name || name[0] == '\0')
1863                return NULL;
1864
1865        if (starts_with(name, "refs/"))
1866                return alloc_ref(name);
1867
1868        if (starts_with(name, "heads/") ||
1869            starts_with(name, "tags/") ||
1870            starts_with(name, "remotes/"))
1871                return alloc_ref_with_prefix("refs/", 5, name);
1872
1873        return alloc_ref_with_prefix("refs/heads/", 11, name);
1874}
1875
1876int get_fetch_map(const struct ref *remote_refs,
1877                  const struct refspec *refspec,
1878                  struct ref ***tail,
1879                  int missing_ok)
1880{
1881        struct ref *ref_map, **rmp;
1882
1883        if (refspec->pattern) {
1884                ref_map = get_expanded_map(remote_refs, refspec);
1885        } else {
1886                const char *name = refspec->src[0] ? refspec->src : "HEAD";
1887
1888                if (refspec->exact_sha1) {
1889                        ref_map = alloc_ref(name);
1890                        get_oid_hex(name, &ref_map->old_oid);
1891                } else {
1892                        ref_map = get_remote_ref(remote_refs, name);
1893                }
1894                if (!missing_ok && !ref_map)
1895                        die("Couldn't find remote ref %s", name);
1896                if (ref_map) {
1897                        ref_map->peer_ref = get_local_ref(refspec->dst);
1898                        if (ref_map->peer_ref && refspec->force)
1899                                ref_map->peer_ref->force = 1;
1900                }
1901        }
1902
1903        for (rmp = &ref_map; *rmp; ) {
1904                if ((*rmp)->peer_ref) {
1905                        if (!starts_with((*rmp)->peer_ref->name, "refs/") ||
1906                            check_refname_format((*rmp)->peer_ref->name, 0)) {
1907                                struct ref *ignore = *rmp;
1908                                error("* Ignoring funny ref '%s' locally",
1909                                      (*rmp)->peer_ref->name);
1910                                *rmp = (*rmp)->next;
1911                                free(ignore->peer_ref);
1912                                free(ignore);
1913                                continue;
1914                        }
1915                }
1916                rmp = &((*rmp)->next);
1917        }
1918
1919        if (ref_map)
1920                tail_link_ref(ref_map, tail);
1921
1922        return 0;
1923}
1924
1925int resolve_remote_symref(struct ref *ref, struct ref *list)
1926{
1927        if (!ref->symref)
1928                return 0;
1929        for (; list; list = list->next)
1930                if (!strcmp(ref->symref, list->name)) {
1931                        oidcpy(&ref->old_oid, &list->old_oid);
1932                        return 0;
1933                }
1934        return 1;
1935}
1936
1937static void unmark_and_free(struct commit_list *list, unsigned int mark)
1938{
1939        while (list) {
1940                struct commit *commit = pop_commit(&list);
1941                commit->object.flags &= ~mark;
1942        }
1943}
1944
1945int ref_newer(const struct object_id *new_oid, const struct object_id *old_oid)
1946{
1947        struct object *o;
1948        struct commit *old, *new;
1949        struct commit_list *list, *used;
1950        int found = 0;
1951
1952        /*
1953         * Both new and old must be commit-ish and new is descendant of
1954         * old.  Otherwise we require --force.
1955         */
1956        o = deref_tag(parse_object(old_oid->hash), NULL, 0);
1957        if (!o || o->type != OBJ_COMMIT)
1958                return 0;
1959        old = (struct commit *) o;
1960
1961        o = deref_tag(parse_object(new_oid->hash), NULL, 0);
1962        if (!o || o->type != OBJ_COMMIT)
1963                return 0;
1964        new = (struct commit *) o;
1965
1966        if (parse_commit(new) < 0)
1967                return 0;
1968
1969        used = list = NULL;
1970        commit_list_insert(new, &list);
1971        while (list) {
1972                new = pop_most_recent_commit(&list, TMP_MARK);
1973                commit_list_insert(new, &used);
1974                if (new == old) {
1975                        found = 1;
1976                        break;
1977                }
1978        }
1979        unmark_and_free(list, TMP_MARK);
1980        unmark_and_free(used, TMP_MARK);
1981        return found;
1982}
1983
1984/*
1985 * Compare a branch with its upstream, and save their differences (number
1986 * of commits) in *num_ours and *num_theirs. The name of the upstream branch
1987 * (or NULL if no upstream is defined) is returned via *upstream_name, if it
1988 * is not itself NULL.
1989 *
1990 * Returns -1 if num_ours and num_theirs could not be filled in (e.g., no
1991 * upstream defined, or ref does not exist), 0 otherwise.
1992 */
1993int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs,
1994                       const char **upstream_name)
1995{
1996        struct object_id oid;
1997        struct commit *ours, *theirs;
1998        struct rev_info revs;
1999        const char *base;
2000        struct argv_array argv = ARGV_ARRAY_INIT;
2001
2002        /* Cannot stat unless we are marked to build on top of somebody else. */
2003        base = branch_get_upstream(branch, NULL);
2004        if (upstream_name)
2005                *upstream_name = base;
2006        if (!base)
2007                return -1;
2008
2009        /* Cannot stat if what we used to build on no longer exists */
2010        if (read_ref(base, oid.hash))
2011                return -1;
2012        theirs = lookup_commit_reference(oid.hash);
2013        if (!theirs)
2014                return -1;
2015
2016        if (read_ref(branch->refname, oid.hash))
2017                return -1;
2018        ours = lookup_commit_reference(oid.hash);
2019        if (!ours)
2020                return -1;
2021
2022        /* are we the same? */
2023        if (theirs == ours) {
2024                *num_theirs = *num_ours = 0;
2025                return 0;
2026        }
2027
2028        /* Run "rev-list --left-right ours...theirs" internally... */
2029        argv_array_push(&argv, ""); /* ignored */
2030        argv_array_push(&argv, "--left-right");
2031        argv_array_pushf(&argv, "%s...%s",
2032                         oid_to_hex(&ours->object.oid),
2033                         oid_to_hex(&theirs->object.oid));
2034        argv_array_push(&argv, "--");
2035
2036        init_revisions(&revs, NULL);
2037        setup_revisions(argv.argc, argv.argv, &revs, NULL);
2038        if (prepare_revision_walk(&revs))
2039                die("revision walk setup failed");
2040
2041        /* ... and count the commits on each side. */
2042        *num_ours = 0;
2043        *num_theirs = 0;
2044        while (1) {
2045                struct commit *c = get_revision(&revs);
2046                if (!c)
2047                        break;
2048                if (c->object.flags & SYMMETRIC_LEFT)
2049                        (*num_ours)++;
2050                else
2051                        (*num_theirs)++;
2052        }
2053
2054        /* clear object flags smudged by the above traversal */
2055        clear_commit_marks(ours, ALL_REV_FLAGS);
2056        clear_commit_marks(theirs, ALL_REV_FLAGS);
2057
2058        argv_array_clear(&argv);
2059        return 0;
2060}
2061
2062/*
2063 * Return true when there is anything to report, otherwise false.
2064 */
2065int format_tracking_info(struct branch *branch, struct strbuf *sb)
2066{
2067        int ours, theirs;
2068        const char *full_base;
2069        char *base;
2070        int upstream_is_gone = 0;
2071
2072        if (stat_tracking_info(branch, &ours, &theirs, &full_base) < 0) {
2073                if (!full_base)
2074                        return 0;
2075                upstream_is_gone = 1;
2076        }
2077
2078        base = shorten_unambiguous_ref(full_base, 0);
2079        if (upstream_is_gone) {
2080                strbuf_addf(sb,
2081                        _("Your branch is based on '%s', but the upstream is gone.\n"),
2082                        base);
2083                if (advice_status_hints)
2084                        strbuf_addstr(sb,
2085                                _("  (use \"git branch --unset-upstream\" to fixup)\n"));
2086        } else if (!ours && !theirs) {
2087                strbuf_addf(sb,
2088                        _("Your branch is up-to-date with '%s'.\n"),
2089                        base);
2090        } else if (!theirs) {
2091                strbuf_addf(sb,
2092                        Q_("Your branch is ahead of '%s' by %d commit.\n",
2093                           "Your branch is ahead of '%s' by %d commits.\n",
2094                           ours),
2095                        base, ours);
2096                if (advice_status_hints)
2097                        strbuf_addstr(sb,
2098                                _("  (use \"git push\" to publish your local commits)\n"));
2099        } else if (!ours) {
2100                strbuf_addf(sb,
2101                        Q_("Your branch is behind '%s' by %d commit, "
2102                               "and can be fast-forwarded.\n",
2103                           "Your branch is behind '%s' by %d commits, "
2104                               "and can be fast-forwarded.\n",
2105                           theirs),
2106                        base, theirs);
2107                if (advice_status_hints)
2108                        strbuf_addstr(sb,
2109                                _("  (use \"git pull\" to update your local branch)\n"));
2110        } else {
2111                strbuf_addf(sb,
2112                        Q_("Your branch and '%s' have diverged,\n"
2113                               "and have %d and %d different commit each, "
2114                               "respectively.\n",
2115                           "Your branch and '%s' have diverged,\n"
2116                               "and have %d and %d different commits each, "
2117                               "respectively.\n",
2118                           ours + theirs),
2119                        base, ours, theirs);
2120                if (advice_status_hints)
2121                        strbuf_addstr(sb,
2122                                _("  (use \"git pull\" to merge the remote branch into yours)\n"));
2123        }
2124        free(base);
2125        return 1;
2126}
2127
2128static int one_local_ref(const char *refname, const struct object_id *oid,
2129                         int flag, void *cb_data)
2130{
2131        struct ref ***local_tail = cb_data;
2132        struct ref *ref;
2133
2134        /* we already know it starts with refs/ to get here */
2135        if (check_refname_format(refname + 5, 0))
2136                return 0;
2137
2138        ref = alloc_ref(refname);
2139        oidcpy(&ref->new_oid, oid);
2140        **local_tail = ref;
2141        *local_tail = &ref->next;
2142        return 0;
2143}
2144
2145struct ref *get_local_heads(void)
2146{
2147        struct ref *local_refs = NULL, **local_tail = &local_refs;
2148
2149        for_each_ref(one_local_ref, &local_tail);
2150        return local_refs;
2151}
2152
2153struct ref *guess_remote_head(const struct ref *head,
2154                              const struct ref *refs,
2155                              int all)
2156{
2157        const struct ref *r;
2158        struct ref *list = NULL;
2159        struct ref **tail = &list;
2160
2161        if (!head)
2162                return NULL;
2163
2164        /*
2165         * Some transports support directly peeking at
2166         * where HEAD points; if that is the case, then
2167         * we don't have to guess.
2168         */
2169        if (head->symref)
2170                return copy_ref(find_ref_by_name(refs, head->symref));
2171
2172        /* If refs/heads/master could be right, it is. */
2173        if (!all) {
2174                r = find_ref_by_name(refs, "refs/heads/master");
2175                if (r && !oidcmp(&r->old_oid, &head->old_oid))
2176                        return copy_ref(r);
2177        }
2178
2179        /* Look for another ref that points there */
2180        for (r = refs; r; r = r->next) {
2181                if (r != head &&
2182                    starts_with(r->name, "refs/heads/") &&
2183                    !oidcmp(&r->old_oid, &head->old_oid)) {
2184                        *tail = copy_ref(r);
2185                        tail = &((*tail)->next);
2186                        if (!all)
2187                                break;
2188                }
2189        }
2190
2191        return list;
2192}
2193
2194struct stale_heads_info {
2195        struct string_list *ref_names;
2196        struct ref **stale_refs_tail;
2197        struct refspec *refs;
2198        int ref_count;
2199};
2200
2201static int get_stale_heads_cb(const char *refname, const struct object_id *oid,
2202                              int flags, void *cb_data)
2203{
2204        struct stale_heads_info *info = cb_data;
2205        struct string_list matches = STRING_LIST_INIT_DUP;
2206        struct refspec query;
2207        int i, stale = 1;
2208        memset(&query, 0, sizeof(struct refspec));
2209        query.dst = (char *)refname;
2210
2211        query_refspecs_multiple(info->refs, info->ref_count, &query, &matches);
2212        if (matches.nr == 0)
2213                goto clean_exit; /* No matches */
2214
2215        /*
2216         * If we did find a suitable refspec and it's not a symref and
2217         * it's not in the list of refs that currently exist in that
2218         * remote, we consider it to be stale. In order to deal with
2219         * overlapping refspecs, we need to go over all of the
2220         * matching refs.
2221         */
2222        if (flags & REF_ISSYMREF)
2223                goto clean_exit;
2224
2225        for (i = 0; stale && i < matches.nr; i++)
2226                if (string_list_has_string(info->ref_names, matches.items[i].string))
2227                        stale = 0;
2228
2229        if (stale) {
2230                struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
2231                oidcpy(&ref->new_oid, oid);
2232        }
2233
2234clean_exit:
2235        string_list_clear(&matches, 0);
2236        return 0;
2237}
2238
2239struct ref *get_stale_heads(struct refspec *refs, int ref_count, struct ref *fetch_map)
2240{
2241        struct ref *ref, *stale_refs = NULL;
2242        struct string_list ref_names = STRING_LIST_INIT_NODUP;
2243        struct stale_heads_info info;
2244
2245        info.ref_names = &ref_names;
2246        info.stale_refs_tail = &stale_refs;
2247        info.refs = refs;
2248        info.ref_count = ref_count;
2249        for (ref = fetch_map; ref; ref = ref->next)
2250                string_list_append(&ref_names, ref->name);
2251        string_list_sort(&ref_names);
2252        for_each_ref(get_stale_heads_cb, &info);
2253        string_list_clear(&ref_names, 0);
2254        return stale_refs;
2255}
2256
2257/*
2258 * Compare-and-swap
2259 */
2260static void clear_cas_option(struct push_cas_option *cas)
2261{
2262        int i;
2263
2264        for (i = 0; i < cas->nr; i++)
2265                free(cas->entry[i].refname);
2266        free(cas->entry);
2267        memset(cas, 0, sizeof(*cas));
2268}
2269
2270static struct push_cas *add_cas_entry(struct push_cas_option *cas,
2271                                      const char *refname,
2272                                      size_t refnamelen)
2273{
2274        struct push_cas *entry;
2275        ALLOC_GROW(cas->entry, cas->nr + 1, cas->alloc);
2276        entry = &cas->entry[cas->nr++];
2277        memset(entry, 0, sizeof(*entry));
2278        entry->refname = xmemdupz(refname, refnamelen);
2279        return entry;
2280}
2281
2282static int parse_push_cas_option(struct push_cas_option *cas, const char *arg, int unset)
2283{
2284        const char *colon;
2285        struct push_cas *entry;
2286
2287        if (unset) {
2288                /* "--no-<option>" */
2289                clear_cas_option(cas);
2290                return 0;
2291        }
2292
2293        if (!arg) {
2294                /* just "--<option>" */
2295                cas->use_tracking_for_rest = 1;
2296                return 0;
2297        }
2298
2299        /* "--<option>=refname" or "--<option>=refname:value" */
2300        colon = strchrnul(arg, ':');
2301        entry = add_cas_entry(cas, arg, colon - arg);
2302        if (!*colon)
2303                entry->use_tracking = 1;
2304        else if (!colon[1])
2305                hashclr(entry->expect);
2306        else if (get_sha1(colon + 1, entry->expect))
2307                return error("cannot parse expected object name '%s'", colon + 1);
2308        return 0;
2309}
2310
2311int parseopt_push_cas_option(const struct option *opt, const char *arg, int unset)
2312{
2313        return parse_push_cas_option(opt->value, arg, unset);
2314}
2315
2316int is_empty_cas(const struct push_cas_option *cas)
2317{
2318        return !cas->use_tracking_for_rest && !cas->nr;
2319}
2320
2321/*
2322 * Look at remote.fetch refspec and see if we have a remote
2323 * tracking branch for the refname there.  Fill its current
2324 * value in sha1[].
2325 * If we cannot do so, return negative to signal an error.
2326 */
2327static int remote_tracking(struct remote *remote, const char *refname,
2328                           struct object_id *oid)
2329{
2330        char *dst;
2331
2332        dst = apply_refspecs(remote->fetch, remote->fetch_refspec_nr, refname);
2333        if (!dst)
2334                return -1; /* no tracking ref for refname at remote */
2335        if (read_ref(dst, oid->hash))
2336                return -1; /* we know what the tracking ref is but we cannot read it */
2337        return 0;
2338}
2339
2340static void apply_cas(struct push_cas_option *cas,
2341                      struct remote *remote,
2342                      struct ref *ref)
2343{
2344        int i;
2345
2346        /* Find an explicit --<option>=<name>[:<value>] entry */
2347        for (i = 0; i < cas->nr; i++) {
2348                struct push_cas *entry = &cas->entry[i];
2349                if (!refname_match(entry->refname, ref->name))
2350                        continue;
2351                ref->expect_old_sha1 = 1;
2352                if (!entry->use_tracking)
2353                        hashcpy(ref->old_oid_expect.hash, cas->entry[i].expect);
2354                else if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
2355                        oidclr(&ref->old_oid_expect);
2356                return;
2357        }
2358
2359        /* Are we using "--<option>" to cover all? */
2360        if (!cas->use_tracking_for_rest)
2361                return;
2362
2363        ref->expect_old_sha1 = 1;
2364        if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
2365                oidclr(&ref->old_oid_expect);
2366}
2367
2368void apply_push_cas(struct push_cas_option *cas,
2369                    struct remote *remote,
2370                    struct ref *remote_refs)
2371{
2372        struct ref *ref;
2373        for (ref = remote_refs; ref; ref = ref->next)
2374                apply_cas(cas, remote, ref);
2375}