git.oblomov.eu Git - git/blob - remote.c

   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
   9 static struct refspec s_tag_refspec = {
  10         0,
  11         1,
  12         0,
  13         "refs/tags/*",
  14         "refs/tags/*"
  15 };
  16
  17 const struct refspec *tag_refspec = &s_tag_refspec;
  18
  19 struct counted_string {
  20         size_t len;
  21         const char *s;
  22 };
  23 struct rewrite {
  24         const char *base;
  25         size_t baselen;
  26         struct counted_string *instead_of;
  27         int instead_of_nr;
  28         int instead_of_alloc;
  29 };
  30
  31 static struct remote **remotes;
  32 static int remotes_alloc;
  33 static int remotes_nr;
  34
  35 static struct branch **branches;
  36 static int branches_alloc;
  37 static int branches_nr;
  38
  39 static struct branch *current_branch;
  40 static const char *default_remote_name;
  41
  42 static struct rewrite **rewrite;
  43 static int rewrite_alloc;
  44 static int rewrite_nr;
  45
  46 #define BUF_SIZE (2048)
  47 static char buffer[BUF_SIZE];
  48
  49 static const char *alias_url(const char *url)
  50 {
  51         int i, j;
  52         char *ret;
  53         struct counted_string *longest;
  54         int longest_i;
  55
  56         longest = NULL;
  57         longest_i = -1;
  58         for (i = 0; i < rewrite_nr; i++) {
  59                 if (!rewrite[i])
  60                         continue;
  61                 for (j = 0; j < rewrite[i]->instead_of_nr; j++) {
  62                         if (!prefixcmp(url, rewrite[i]->instead_of[j].s) &&
  63                             (!longest ||
  64                              longest->len < rewrite[i]->instead_of[j].len)) {
  65                                 longest = &(rewrite[i]->instead_of[j]);
  66                                 longest_i = i;
  67                         }
  68                 }
  69         }
  70         if (!longest)
  71                 return url;
  72
  73         ret = xmalloc(rewrite[longest_i]->baselen +
  74                      (strlen(url) - longest->len) + 1);
  75         strcpy(ret, rewrite[longest_i]->base);
  76         strcpy(ret + rewrite[longest_i]->baselen, url + longest->len);
  77         return ret;
  78 }
  79
  80 static void add_push_refspec(struct remote *remote, const char *ref)
  81 {
  82         ALLOC_GROW(remote->push_refspec,
  83                    remote->push_refspec_nr + 1,
  84                    remote->push_refspec_alloc);
  85         remote->push_refspec[remote->push_refspec_nr++] = ref;
  86 }
  87
  88 static void add_fetch_refspec(struct remote *remote, const char *ref)
  89 {
  90         ALLOC_GROW(remote->fetch_refspec,
  91                    remote->fetch_refspec_nr + 1,
  92                    remote->fetch_refspec_alloc);
  93         remote->fetch_refspec[remote->fetch_refspec_nr++] = ref;
  94 }
  95
  96 static void add_url(struct remote *remote, const char *url)
  97 {
  98         ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
  99         remote->url[remote->url_nr++] = url;
 100 }
 101
 102 static void add_url_alias(struct remote *remote, const char *url)
 103 {
 104         add_url(remote, alias_url(url));
 105 }
 106
 107 static struct remote *make_remote(const char *name, int len)
 108 {
 109         struct remote *ret;
 110         int i;
 111
 112         for (i = 0; i < remotes_nr; i++) {
 113                 if (len ? (!strncmp(name, remotes[i]->name, len) &&
 114                            !remotes[i]->name[len]) :
 115                     !strcmp(name, remotes[i]->name))
 116                         return remotes[i];
 117         }
 118
 119         ret = xcalloc(1, sizeof(struct remote));
 120         ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
 121         remotes[remotes_nr++] = ret;
 122         if (len)
 123                 ret->name = xstrndup(name, len);
 124         else
 125                 ret->name = xstrdup(name);
 126         return ret;
 127 }
 128
 129 static void add_merge(struct branch *branch, const char *name)
 130 {
 131         ALLOC_GROW(branch->merge_name, branch->merge_nr + 1,
 132                    branch->merge_alloc);
 133         branch->merge_name[branch->merge_nr++] = name;
 134 }
 135
 136 static struct branch *make_branch(const char *name, int len)
 137 {
 138         struct branch *ret;
 139         int i;
 140         char *refname;
 141
 142         for (i = 0; i < branches_nr; i++) {
 143                 if (len ? (!strncmp(name, branches[i]->name, len) &&
 144                            !branches[i]->name[len]) :
 145                     !strcmp(name, branches[i]->name))
 146                         return branches[i];
 147         }
 148
 149         ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
 150         ret = xcalloc(1, sizeof(struct branch));
 151         branches[branches_nr++] = ret;
 152         if (len)
 153                 ret->name = xstrndup(name, len);
 154         else
 155                 ret->name = xstrdup(name);
 156         refname = xmalloc(strlen(name) + strlen("refs/heads/") + 1);
 157         strcpy(refname, "refs/heads/");
 158         strcpy(refname + strlen("refs/heads/"), ret->name);
 159         ret->refname = refname;
 160
 161         return ret;
 162 }
 163
 164 static struct rewrite *make_rewrite(const char *base, int len)
 165 {
 166         struct rewrite *ret;
 167         int i;
 168
 169         for (i = 0; i < rewrite_nr; i++) {
 170                 if (len
 171                     ? (len == rewrite[i]->baselen &&
 172                        !strncmp(base, rewrite[i]->base, len))
 173                     : !strcmp(base, rewrite[i]->base))
 174                         return rewrite[i];
 175         }
 176
 177         ALLOC_GROW(rewrite, rewrite_nr + 1, rewrite_alloc);
 178         ret = xcalloc(1, sizeof(struct rewrite));
 179         rewrite[rewrite_nr++] = ret;
 180         if (len) {
 181                 ret->base = xstrndup(base, len);
 182                 ret->baselen = len;
 183         }
 184         else {
 185                 ret->base = xstrdup(base);
 186                 ret->baselen = strlen(base);
 187         }
 188         return ret;
 189 }
 190
 191 static void add_instead_of(struct rewrite *rewrite, const char *instead_of)
 192 {
 193         ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
 194         rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
 195         rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
 196         rewrite->instead_of_nr++;
 197 }
 198
 199 static void read_remotes_file(struct remote *remote)
 200 {
 201         FILE *f = fopen(git_path("remotes/%s", remote->name), "r");
 202
 203         if (!f)
 204                 return;
 205         remote->origin = REMOTE_REMOTES;
 206         while (fgets(buffer, BUF_SIZE, f)) {
 207                 int value_list;
 208                 char *s, *p;
 209
 210                 if (!prefixcmp(buffer, "URL:")) {
 211                         value_list = 0;
 212                         s = buffer + 4;
 213                 } else if (!prefixcmp(buffer, "Push:")) {
 214                         value_list = 1;
 215                         s = buffer + 5;
 216                 } else if (!prefixcmp(buffer, "Pull:")) {
 217                         value_list = 2;
 218                         s = buffer + 5;
 219                 } else
 220                         continue;
 221
 222                 while (isspace(*s))
 223                         s++;
 224                 if (!*s)
 225                         continue;
 226
 227                 p = s + strlen(s);
 228                 while (isspace(p[-1]))
 229                         *--p = 0;
 230
 231                 switch (value_list) {
 232                 case 0:
 233                         add_url_alias(remote, xstrdup(s));
 234                         break;
 235                 case 1:
 236                         add_push_refspec(remote, xstrdup(s));
 237                         break;
 238                 case 2:
 239                         add_fetch_refspec(remote, xstrdup(s));
 240                         break;
 241                 }
 242         }
 243         fclose(f);
 244 }
 245
 246 static void read_branches_file(struct remote *remote)
 247 {
 248         const char *slash = strchr(remote->name, '/');
 249         char *frag;
 250         struct strbuf branch = STRBUF_INIT;
 251         int n = slash ? slash - remote->name : 1000;
 252         FILE *f = fopen(git_path("branches/%.*s", n, remote->name), "r");
 253         char *s, *p;
 254         int len;
 255
 256         if (!f)
 257                 return;
 258         s = fgets(buffer, BUF_SIZE, f);
 259         fclose(f);
 260         if (!s)
 261                 return;
 262         while (isspace(*s))
 263                 s++;
 264         if (!*s)
 265                 return;
 266         remote->origin = REMOTE_BRANCHES;
 267         p = s + strlen(s);
 268         while (isspace(p[-1]))
 269                 *--p = 0;
 270         len = p - s;
 271         if (slash)
 272                 len += strlen(slash);
 273         p = xmalloc(len + 1);
 274         strcpy(p, s);
 275         if (slash)
 276                 strcat(p, slash);
 277
 278         /*
 279          * With "slash", e.g. "git fetch jgarzik/netdev-2.6" when
 280          * reading from $GIT_DIR/branches/jgarzik fetches "HEAD" from
 281          * the partial URL obtained from the branches file plus
 282          * "/netdev-2.6" and does not store it in any tracking ref.
 283          * #branch specifier in the file is ignored.
 284          *
 285          * Otherwise, the branches file would have URL and optionally
 286          * #branch specified.  The "master" (or specified) branch is
 287          * fetched and stored in the local branch of the same name.
 288          */
 289         frag = strchr(p, '#');
 290         if (frag) {
 291                 *(frag++) = '\0';
 292                 strbuf_addf(&branch, "refs/heads/%s", frag);
 293         } else
 294                 strbuf_addstr(&branch, "refs/heads/master");
 295         if (!slash) {
 296                 strbuf_addf(&branch, ":refs/heads/%s", remote->name);
 297         } else {
 298                 strbuf_reset(&branch);
 299                 strbuf_addstr(&branch, "HEAD:");
 300         }
 301         add_url_alias(remote, p);
 302         add_fetch_refspec(remote, strbuf_detach(&branch, 0));
 303         /*
 304          * Cogito compatible push: push current HEAD to remote #branch
 305          * (master if missing)
 306          */
 307         strbuf_init(&branch, 0);
 308         strbuf_addstr(&branch, "HEAD");
 309         if (frag)
 310                 strbuf_addf(&branch, ":refs/heads/%s", frag);
 311         else
 312                 strbuf_addstr(&branch, ":refs/heads/master");
 313         add_push_refspec(remote, strbuf_detach(&branch, 0));
 314         remote->fetch_tags = 1; /* always auto-follow */
 315 }
 316
 317 static int handle_config(const char *key, const char *value, void *cb)
 318 {
 319         const char *name;
 320         const char *subkey;
 321         struct remote *remote;
 322         struct branch *branch;
 323         if (!prefixcmp(key, "branch.")) {
 324                 name = key + 7;
 325                 subkey = strrchr(name, '.');
 326                 if (!subkey)
 327                         return 0;
 328                 branch = make_branch(name, subkey - name);
 329                 if (!strcmp(subkey, ".remote")) {
 330                         if (!value)
 331                                 return config_error_nonbool(key);
 332                         branch->remote_name = xstrdup(value);
 333                         if (branch == current_branch)
 334                                 default_remote_name = branch->remote_name;
 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 (!prefixcmp(key, "url.")) {
 343                 struct rewrite *rewrite;
 344                 name = key + 4;
 345                 subkey = strrchr(name, '.');
 346                 if (!subkey)
 347                         return 0;
 348                 rewrite = make_rewrite(name, subkey - name);
 349                 if (!strcmp(subkey, ".insteadof")) {
 350                         if (!value)
 351                                 return config_error_nonbool(key);
 352                         add_instead_of(rewrite, xstrdup(value));
 353                 }
 354         }
 355         if (prefixcmp(key,  "remote."))
 356                 return 0;
 357         name = key + 7;
 358         if (*name == '/') {
 359                 warning("Config remote shorthand cannot begin with '/': %s",
 360                         name);
 361                 return 0;
 362         }
 363         subkey = strrchr(name, '.');
 364         if (!subkey)
 365                 return error("Config with no key for remote %s", name);
 366         remote = make_remote(name, subkey - name);
 367         remote->origin = REMOTE_CONFIG;
 368         if (!strcmp(subkey, ".mirror"))
 369                 remote->mirror = git_config_bool(key, value);
 370         else if (!strcmp(subkey, ".skipdefaultupdate"))
 371                 remote->skip_default_update = git_config_bool(key, value);
 372
 373         else if (!strcmp(subkey, ".url")) {
 374                 const char *v;
 375                 if (git_config_string(&v, key, value))
 376                         return -1;
 377                 add_url(remote, v);
 378         } else if (!strcmp(subkey, ".push")) {
 379                 const char *v;
 380                 if (git_config_string(&v, key, value))
 381                         return -1;
 382                 add_push_refspec(remote, v);
 383         } else if (!strcmp(subkey, ".fetch")) {
 384                 const char *v;
 385                 if (git_config_string(&v, key, value))
 386                         return -1;
 387                 add_fetch_refspec(remote, v);
 388         } else if (!strcmp(subkey, ".receivepack")) {
 389                 const char *v;
 390                 if (git_config_string(&v, key, value))
 391                         return -1;
 392                 if (!remote->receivepack)
 393                         remote->receivepack = v;
 394                 else
 395                         error("more than one receivepack given, using the first");
 396         } else if (!strcmp(subkey, ".uploadpack")) {
 397                 const char *v;
 398                 if (git_config_string(&v, key, value))
 399                         return -1;
 400                 if (!remote->uploadpack)
 401                         remote->uploadpack = v;
 402                 else
 403                         error("more than one uploadpack given, using the first");
 404         } else if (!strcmp(subkey, ".tagopt")) {
 405                 if (!strcmp(value, "--no-tags"))
 406                         remote->fetch_tags = -1;
 407         } else if (!strcmp(subkey, ".proxy")) {
 408                 return git_config_string((const char **)&remote->http_proxy,
 409                                          key, value);
 410         }
 411         return 0;
 412 }
 413
 414 static void alias_all_urls(void)
 415 {
 416         int i, j;
 417         for (i = 0; i < remotes_nr; i++) {
 418                 if (!remotes[i])
 419                         continue;
 420                 for (j = 0; j < remotes[i]->url_nr; j++) {
 421                         remotes[i]->url[j] = alias_url(remotes[i]->url[j]);
 422                 }
 423         }
 424 }
 425
 426 static void read_config(void)
 427 {
 428         unsigned char sha1[20];
 429         const char *head_ref;
 430         int flag;
 431         if (default_remote_name) // did this already
 432                 return;
 433         default_remote_name = xstrdup("origin");
 434         current_branch = NULL;
 435         head_ref = resolve_ref("HEAD", sha1, 0, &flag);
 436         if (head_ref && (flag & REF_ISSYMREF) &&
 437             !prefixcmp(head_ref, "refs/heads/")) {
 438                 current_branch =
 439                         make_branch(head_ref + strlen("refs/heads/"), 0);
 440         }
 441         git_config(handle_config, NULL);
 442         alias_all_urls();
 443 }
 444
 445 /*
 446  * We need to make sure the tracking branches are well formed, but a
 447  * wildcard refspec in "struct refspec" must have a trailing slash. We
 448  * temporarily drop the trailing '/' while calling check_ref_format(),
 449  * and put it back.  The caller knows that a CHECK_REF_FORMAT_ONELEVEL
 450  * error return is Ok for a wildcard refspec.
 451  */
 452 static int verify_refname(char *name, int is_glob)
 453 {
 454         int result;
 455
 456         result = check_ref_format(name);
 457         if (is_glob && result == CHECK_REF_FORMAT_WILDCARD)
 458                 result = CHECK_REF_FORMAT_OK;
 459         return result;
 460 }
 461
 462 /*
 463  * This function frees a refspec array.
 464  * Warning: code paths should be checked to ensure that the src
 465  *          and dst pointers are always freeable pointers as well
 466  *          as the refspec pointer itself.
 467  */
 468 static void free_refspecs(struct refspec *refspec, int nr_refspec)
 469 {
 470         int i;
 471
 472         if (!refspec)
 473                 return;
 474
 475         for (i = 0; i < nr_refspec; i++) {
 476                 free(refspec[i].src);
 477                 free(refspec[i].dst);
 478         }
 479         free(refspec);
 480 }
 481
 482 static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
 483 {
 484         int i;
 485         int st;
 486         struct refspec *rs = xcalloc(sizeof(*rs), nr_refspec);
 487
 488         for (i = 0; i < nr_refspec; i++) {
 489                 size_t llen;
 490                 int is_glob;
 491                 const char *lhs, *rhs;
 492
 493                 llen = is_glob = 0;
 494
 495                 lhs = refspec[i];
 496                 if (*lhs == '+') {
 497                         rs[i].force = 1;
 498                         lhs++;
 499                 }
 500
 501                 rhs = strrchr(lhs, ':');
 502
 503                 /*
 504                  * Before going on, special case ":" (or "+:") as a refspec
 505                  * for matching refs.
 506                  */
 507                 if (!fetch && rhs == lhs && rhs[1] == '\0') {
 508                         rs[i].matching = 1;
 509                         continue;
 510                 }
 511
 512                 if (rhs) {
 513                         size_t rlen = strlen(++rhs);
 514                         is_glob = (1 <= rlen && strchr(rhs, '*'));
 515                         rs[i].dst = xstrndup(rhs, rlen);
 516                 }
 517
 518                 llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
 519                 if (1 <= llen && memchr(lhs, '*', llen)) {
 520                         if ((rhs && !is_glob) || (!rhs && fetch))
 521                                 goto invalid;
 522                         is_glob = 1;
 523                 } else if (rhs && is_glob) {
 524                         goto invalid;
 525                 }
 526
 527                 rs[i].pattern = is_glob;
 528                 rs[i].src = xstrndup(lhs, llen);
 529
 530                 if (fetch) {
 531                         /*
 532                          * LHS
 533                          * - empty is allowed; it means HEAD.
 534                          * - otherwise it must be a valid looking ref.
 535                          */
 536                         if (!*rs[i].src)
 537                                 ; /* empty is ok */
 538                         else {
 539                                 st = verify_refname(rs[i].src, is_glob);
 540                                 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
 541                                         goto invalid;
 542                         }
 543                         /*
 544                          * RHS
 545                          * - missing is ok, and is same as empty.
 546                          * - empty is ok; it means not to store.
 547                          * - otherwise it must be a valid looking ref.
 548                          */
 549                         if (!rs[i].dst) {
 550                                 ; /* ok */
 551                         } else if (!*rs[i].dst) {
 552                                 ; /* ok */
 553                         } else {
 554                                 st = verify_refname(rs[i].dst, is_glob);
 555                                 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
 556                                         goto invalid;
 557                         }
 558                 } else {
 559                         /*
 560                          * LHS
 561                          * - empty is allowed; it means delete.
 562                          * - when wildcarded, it must be a valid looking ref.
 563                          * - otherwise, it must be an extended SHA-1, but
 564                          *   there is no existing way to validate this.
 565                          */
 566                         if (!*rs[i].src)
 567                                 ; /* empty is ok */
 568                         else if (is_glob) {
 569                                 st = verify_refname(rs[i].src, is_glob);
 570                                 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
 571                                         goto invalid;
 572                         }
 573                         else
 574                                 ; /* anything goes, for now */
 575                         /*
 576                          * RHS
 577                          * - missing is allowed, but LHS then must be a
 578                          *   valid looking ref.
 579                          * - empty is not allowed.
 580                          * - otherwise it must be a valid looking ref.
 581                          */
 582                         if (!rs[i].dst) {
 583                                 st = verify_refname(rs[i].src, is_glob);
 584                                 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
 585                                         goto invalid;
 586                         } else if (!*rs[i].dst) {
 587                                 goto invalid;
 588                         } else {
 589                                 st = verify_refname(rs[i].dst, is_glob);
 590                                 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
 591                                         goto invalid;
 592                         }
 593                 }
 594         }
 595         return rs;
 596
 597  invalid:
 598         if (verify) {
 599                 /*
 600                  * nr_refspec must be greater than zero and i must be valid
 601                  * since it is only possible to reach this point from within
 602                  * the for loop above.
 603                  */
 604                 free_refspecs(rs, i+1);
 605                 return NULL;
 606         }
 607         die("Invalid refspec '%s'", refspec[i]);
 608 }
 609
 610 int valid_fetch_refspec(const char *fetch_refspec_str)
 611 {
 612         const char *fetch_refspec[] = { fetch_refspec_str };
 613         struct refspec *refspec;
 614
 615         refspec = parse_refspec_internal(1, fetch_refspec, 1, 1);
 616         free_refspecs(refspec, 1);
 617         return !!refspec;
 618 }
 619
 620 struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec)
 621 {
 622         return parse_refspec_internal(nr_refspec, refspec, 1, 0);
 623 }
 624
 625 static struct refspec *parse_push_refspec(int nr_refspec, const char **refspec)
 626 {
 627         return parse_refspec_internal(nr_refspec, refspec, 0, 0);
 628 }
 629
 630 static int valid_remote_nick(const char *name)
 631 {
 632         if (!name[0] || is_dot_or_dotdot(name))
 633                 return 0;
 634         return !strchr(name, '/'); /* no slash */
 635 }
 636
 637 struct remote *remote_get(const char *name)
 638 {
 639         struct remote *ret;
 640
 641         read_config();
 642         if (!name)
 643                 name = default_remote_name;
 644         ret = make_remote(name, 0);
 645         if (valid_remote_nick(name)) {
 646                 if (!ret->url)
 647                         read_remotes_file(ret);
 648                 if (!ret->url)
 649                         read_branches_file(ret);
 650         }
 651         if (!ret->url)
 652                 add_url_alias(ret, name);
 653         if (!ret->url)
 654                 return NULL;
 655         ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
 656         ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
 657         return ret;
 658 }
 659
 660 int for_each_remote(each_remote_fn fn, void *priv)
 661 {
 662         int i, result = 0;
 663         read_config();
 664         for (i = 0; i < remotes_nr && !result; i++) {
 665                 struct remote *r = remotes[i];
 666                 if (!r)
 667                         continue;
 668                 if (!r->fetch)
 669                         r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
 670                                                        r->fetch_refspec);
 671                 if (!r->push)
 672                         r->push = parse_push_refspec(r->push_refspec_nr,
 673                                                      r->push_refspec);
 674                 result = fn(r, priv);
 675         }
 676         return result;
 677 }
 678
 679 void ref_remove_duplicates(struct ref *ref_map)
 680 {
 681         struct ref **posn;
 682         struct ref *next;
 683         for (; ref_map; ref_map = ref_map->next) {
 684                 if (!ref_map->peer_ref)
 685                         continue;
 686                 posn = &ref_map->next;
 687                 while (*posn) {
 688                         if ((*posn)->peer_ref &&
 689                             !strcmp((*posn)->peer_ref->name,
 690                                     ref_map->peer_ref->name)) {
 691                                 if (strcmp((*posn)->name, ref_map->name))
 692                                         die("%s tracks both %s and %s",
 693                                             ref_map->peer_ref->name,
 694                                             (*posn)->name, ref_map->name);
 695                                 next = (*posn)->next;
 696                                 free((*posn)->peer_ref);
 697                                 free(*posn);
 698                                 *posn = next;
 699                         } else {
 700                                 posn = &(*posn)->next;
 701                         }
 702                 }
 703         }
 704 }
 705
 706 int remote_has_url(struct remote *remote, const char *url)
 707 {
 708         int i;
 709         for (i = 0; i < remote->url_nr; i++) {
 710                 if (!strcmp(remote->url[i], url))
 711                         return 1;
 712         }
 713         return 0;
 714 }
 715
 716 static int match_name_with_pattern(const char *key, const char *name,
 717                                    const char *value, char **result)
 718 {
 719         const char *kstar = strchr(key, '*');
 720         size_t klen;
 721         size_t ksuffixlen;
 722         size_t namelen;
 723         int ret;
 724         if (!kstar)
 725                 die("Key '%s' of pattern had no '*'", key);
 726         klen = kstar - key;
 727         ksuffixlen = strlen(kstar + 1);
 728         namelen = strlen(name);
 729         ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
 730                 !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
 731         if (ret && value) {
 732                 const char *vstar = strchr(value, '*');
 733                 size_t vlen;
 734                 size_t vsuffixlen;
 735                 if (!vstar)
 736                         die("Value '%s' of pattern has no '*'", value);
 737                 vlen = vstar - value;
 738                 vsuffixlen = strlen(vstar + 1);
 739                 *result = xmalloc(vlen + vsuffixlen +
 740                                   strlen(name) -
 741                                   klen - ksuffixlen + 1);
 742                 strncpy(*result, value, vlen);
 743                 strncpy(*result + vlen,
 744                         name + klen, namelen - klen - ksuffixlen);
 745                 strcpy(*result + vlen + namelen - klen - ksuffixlen,
 746                        vstar + 1);
 747         }
 748         return ret;
 749 }
 750
 751 int remote_find_tracking(struct remote *remote, struct refspec *refspec)
 752 {
 753         int find_src = refspec->src == NULL;
 754         char *needle, **result;
 755         int i;
 756
 757         if (find_src) {
 758                 if (!refspec->dst)
 759                         return error("find_tracking: need either src or dst");
 760                 needle = refspec->dst;
 761                 result = &refspec->src;
 762         } else {
 763                 needle = refspec->src;
 764                 result = &refspec->dst;
 765         }
 766
 767         for (i = 0; i < remote->fetch_refspec_nr; i++) {
 768                 struct refspec *fetch = &remote->fetch[i];
 769                 const char *key = find_src ? fetch->dst : fetch->src;
 770                 const char *value = find_src ? fetch->src : fetch->dst;
 771                 if (!fetch->dst)
 772                         continue;
 773                 if (fetch->pattern) {
 774                         if (match_name_with_pattern(key, needle, value, result)) {
 775                                 refspec->force = fetch->force;
 776                                 return 0;
 777                         }
 778                 } else if (!strcmp(needle, key)) {
 779                         *result = xstrdup(value);
 780                         refspec->force = fetch->force;
 781                         return 0;
 782                 }
 783         }
 784         return -1;
 785 }
 786
 787 static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
 788                 const char *name)
 789 {
 790         size_t len = strlen(name);
 791         struct ref *ref = xcalloc(1, sizeof(struct ref) + prefixlen + len + 1);
 792         memcpy(ref->name, prefix, prefixlen);
 793         memcpy(ref->name + prefixlen, name, len);
 794         return ref;
 795 }
 796
 797 struct ref *alloc_ref(const char *name)
 798 {
 799         return alloc_ref_with_prefix("", 0, name);
 800 }
 801
 802 static struct ref *copy_ref(const struct ref *ref)
 803 {
 804         struct ref *ret = xmalloc(sizeof(struct ref) + strlen(ref->name) + 1);
 805         memcpy(ret, ref, sizeof(struct ref) + strlen(ref->name) + 1);
 806         ret->next = NULL;
 807         return ret;
 808 }
 809
 810 struct ref *copy_ref_list(const struct ref *ref)
 811 {
 812         struct ref *ret = NULL;
 813         struct ref **tail = &ret;
 814         while (ref) {
 815                 *tail = copy_ref(ref);
 816                 ref = ref->next;
 817                 tail = &((*tail)->next);
 818         }
 819         return ret;
 820 }
 821
 822 static void free_ref(struct ref *ref)
 823 {
 824         if (!ref)
 825                 return;
 826         free(ref->remote_status);
 827         free(ref->symref);
 828         free(ref);
 829 }
 830
 831 void free_refs(struct ref *ref)
 832 {
 833         struct ref *next;
 834         while (ref) {
 835                 next = ref->next;
 836                 free(ref->peer_ref);
 837                 free_ref(ref);
 838                 ref = next;
 839         }
 840 }
 841
 842 static int count_refspec_match(const char *pattern,
 843                                struct ref *refs,
 844                                struct ref **matched_ref)
 845 {
 846         int patlen = strlen(pattern);
 847         struct ref *matched_weak = NULL;
 848         struct ref *matched = NULL;
 849         int weak_match = 0;
 850         int match = 0;
 851
 852         for (weak_match = match = 0; refs; refs = refs->next) {
 853                 char *name = refs->name;
 854                 int namelen = strlen(name);
 855
 856                 if (!refname_match(pattern, name, ref_rev_parse_rules))
 857                         continue;
 858
 859                 /* A match is "weak" if it is with refs outside
 860                  * heads or tags, and did not specify the pattern
 861                  * in full (e.g. "refs/remotes/origin/master") or at
 862                  * least from the toplevel (e.g. "remotes/origin/master");
 863                  * otherwise "git push $URL master" would result in
 864                  * ambiguity between remotes/origin/master and heads/master
 865                  * at the remote site.
 866                  */
 867                 if (namelen != patlen &&
 868                     patlen != namelen - 5 &&
 869                     prefixcmp(name, "refs/heads/") &&
 870                     prefixcmp(name, "refs/tags/")) {
 871                         /* We want to catch the case where only weak
 872                          * matches are found and there are multiple
 873                          * matches, and where more than one strong
 874                          * matches are found, as ambiguous.  One
 875                          * strong match with zero or more weak matches
 876                          * are acceptable as a unique match.
 877                          */
 878                         matched_weak = refs;
 879                         weak_match++;
 880                 }
 881                 else {
 882                         matched = refs;
 883                         match++;
 884                 }
 885         }
 886         if (!matched) {
 887                 *matched_ref = matched_weak;
 888                 return weak_match;
 889         }
 890         else {
 891                 *matched_ref = matched;
 892                 return match;
 893         }
 894 }
 895
 896 static void tail_link_ref(struct ref *ref, struct ref ***tail)
 897 {
 898         **tail = ref;
 899         while (ref->next)
 900                 ref = ref->next;
 901         *tail = &ref->next;
 902 }
 903
 904 static struct ref *try_explicit_object_name(const char *name)
 905 {
 906         unsigned char sha1[20];
 907         struct ref *ref;
 908
 909         if (!*name) {
 910                 ref = alloc_ref("(delete)");
 911                 hashclr(ref->new_sha1);
 912                 return ref;
 913         }
 914         if (get_sha1(name, sha1))
 915                 return NULL;
 916         ref = alloc_ref(name);
 917         hashcpy(ref->new_sha1, sha1);
 918         return ref;
 919 }
 920
 921 static struct ref *make_linked_ref(const char *name, struct ref ***tail)
 922 {
 923         struct ref *ret = alloc_ref(name);
 924         tail_link_ref(ret, tail);
 925         return ret;
 926 }
 927
 928 static char *guess_ref(const char *name, struct ref *peer)
 929 {
 930         struct strbuf buf = STRBUF_INIT;
 931         unsigned char sha1[20];
 932
 933         const char *r = resolve_ref(peer->name, sha1, 1, NULL);
 934         if (!r)
 935                 return NULL;
 936
 937         if (!prefixcmp(r, "refs/heads/"))
 938                 strbuf_addstr(&buf, "refs/heads/");
 939         else if (!prefixcmp(r, "refs/tags/"))
 940                 strbuf_addstr(&buf, "refs/tags/");
 941         else
 942                 return NULL;
 943
 944         strbuf_addstr(&buf, name);
 945         return strbuf_detach(&buf, NULL);
 946 }
 947
 948 static int match_explicit(struct ref *src, struct ref *dst,
 949                           struct ref ***dst_tail,
 950                           struct refspec *rs)
 951 {
 952         struct ref *matched_src, *matched_dst;
 953
 954         const char *dst_value = rs->dst;
 955         char *dst_guess;
 956
 957         if (rs->pattern || rs->matching)
 958                 return 0;
 959
 960         matched_src = matched_dst = NULL;
 961         switch (count_refspec_match(rs->src, src, &matched_src)) {
 962         case 1:
 963                 break;
 964         case 0:
 965                 /* The source could be in the get_sha1() format
 966                  * not a reference name.  :refs/other is a
 967                  * way to delete 'other' ref at the remote end.
 968                  */
 969                 matched_src = try_explicit_object_name(rs->src);
 970                 if (!matched_src)
 971                         return error("src refspec %s does not match any.", rs->src);
 972                 break;
 973         default:
 974                 return error("src refspec %s matches more than one.", rs->src);
 975         }
 976
 977         if (!dst_value) {
 978                 unsigned char sha1[20];
 979                 int flag;
 980
 981                 dst_value = resolve_ref(matched_src->name, sha1, 1, &flag);
 982                 if (!dst_value ||
 983                     ((flag & REF_ISSYMREF) &&
 984                      prefixcmp(dst_value, "refs/heads/")))
 985                         die("%s cannot be resolved to branch.",
 986                             matched_src->name);
 987         }
 988
 989         switch (count_refspec_match(dst_value, dst, &matched_dst)) {
 990         case 1:
 991                 break;
 992         case 0:
 993                 if (!memcmp(dst_value, "refs/", 5))
 994                         matched_dst = make_linked_ref(dst_value, dst_tail);
 995                 else if((dst_guess = guess_ref(dst_value, matched_src)))
 996                         matched_dst = make_linked_ref(dst_guess, dst_tail);
 997                 else
 998                         error("unable to push to unqualified destination: %s\n"
 999                               "The destination refspec neither matches an "
1000                               "existing ref on the remote nor\n"
1001                               "begins with refs/, and we are unable to "
1002                               "guess a prefix based on the source ref.",
1003                               dst_value);
1004                 break;
1005         default:
1006                 matched_dst = NULL;
1007                 error("dst refspec %s matches more than one.",
1008                       dst_value);
1009                 break;
1010         }
1011         if (!matched_dst)
1012                 return -1;
1013         if (matched_dst->peer_ref)
1014                 return error("dst ref %s receives from more than one src.",
1015                       matched_dst->name);
1016         else {
1017                 matched_dst->peer_ref = matched_src;
1018                 matched_dst->force = rs->force;
1019         }
1020         return 0;
1021 }
1022
1023 static int match_explicit_refs(struct ref *src, struct ref *dst,
1024                                struct ref ***dst_tail, struct refspec *rs,
1025                                int rs_nr)
1026 {
1027         int i, errs;
1028         for (i = errs = 0; i < rs_nr; i++)
1029                 errs += match_explicit(src, dst, dst_tail, &rs[i]);
1030         return errs;
1031 }
1032
1033 static const struct refspec *check_pattern_match(const struct refspec *rs,
1034                                                  int rs_nr,
1035                                                  const struct ref *src)
1036 {
1037         int i;
1038         int matching_refs = -1;
1039         for (i = 0; i < rs_nr; i++) {
1040                 if (rs[i].matching &&
1041                     (matching_refs == -1 || rs[i].force)) {
1042                         matching_refs = i;
1043                         continue;
1044                 }
1045
1046                 if (rs[i].pattern && match_name_with_pattern(rs[i].src, src->name,
1047                                                              NULL, NULL))
1048                         return rs + i;
1049         }
1050         if (matching_refs != -1)
1051                 return rs + matching_refs;
1052         else
1053                 return NULL;
1054 }
1055
1056 /*
1057  * Note. This is used only by "push"; refspec matching rules for
1058  * push and fetch are subtly different, so do not try to reuse it
1059  * without thinking.
1060  */
1061 int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
1062                int nr_refspec, const char **refspec, int flags)
1063 {
1064         struct refspec *rs;
1065         int send_all = flags & MATCH_REFS_ALL;
1066         int send_mirror = flags & MATCH_REFS_MIRROR;
1067         static const char *default_refspec[] = { ":", 0 };
1068
1069         if (!nr_refspec) {
1070                 nr_refspec = 1;
1071                 refspec = default_refspec;
1072         }
1073         rs = parse_push_refspec(nr_refspec, (const char **) refspec);
1074         if (match_explicit_refs(src, dst, dst_tail, rs, nr_refspec))
1075                 return -1;
1076
1077         /* pick the remainder */
1078         for ( ; src; src = src->next) {
1079                 struct ref *dst_peer;
1080                 const struct refspec *pat = NULL;
1081                 char *dst_name;
1082                 if (src->peer_ref)
1083                         continue;
1084
1085                 pat = check_pattern_match(rs, nr_refspec, src);
1086                 if (!pat)
1087                         continue;
1088
1089                 if (pat->matching) {
1090                         /*
1091                          * "matching refs"; traditionally we pushed everything
1092                          * including refs outside refs/heads/ hierarchy, but
1093                          * that does not make much sense these days.
1094                          */
1095                         if (!send_mirror && prefixcmp(src->name, "refs/heads/"))
1096                                 continue;
1097                         dst_name = xstrdup(src->name);
1098
1099                 } else {
1100                         const char *dst_side = pat->dst ? pat->dst : pat->src;
1101                         if (!match_name_with_pattern(pat->src, src->name,
1102                                                      dst_side, &dst_name))
1103                                 die("Didn't think it matches any more");
1104                 }
1105                 dst_peer = find_ref_by_name(dst, dst_name);
1106                 if (dst_peer) {
1107                         if (dst_peer->peer_ref)
1108                                 /* We're already sending something to this ref. */
1109                                 goto free_name;
1110
1111                 } else {
1112                         if (pat->matching && !(send_all || send_mirror))
1113                                 /*
1114                                  * Remote doesn't have it, and we have no
1115                                  * explicit pattern, and we don't have
1116                                  * --all nor --mirror.
1117                                  */
1118                                 goto free_name;
1119
1120                         /* Create a new one and link it */
1121                         dst_peer = make_linked_ref(dst_name, dst_tail);
1122                         hashcpy(dst_peer->new_sha1, src->new_sha1);
1123                 }
1124                 dst_peer->peer_ref = src;
1125                 dst_peer->force = pat->force;
1126         free_name:
1127                 free(dst_name);
1128         }
1129         return 0;
1130 }
1131
1132 struct branch *branch_get(const char *name)
1133 {
1134         struct branch *ret;
1135
1136         read_config();
1137         if (!name || !*name || !strcmp(name, "HEAD"))
1138                 ret = current_branch;
1139         else
1140                 ret = make_branch(name, 0);
1141         if (ret && ret->remote_name) {
1142                 ret->remote = remote_get(ret->remote_name);
1143                 if (ret->merge_nr) {
1144                         int i;
1145                         ret->merge = xcalloc(sizeof(*ret->merge),
1146                                              ret->merge_nr);
1147                         for (i = 0; i < ret->merge_nr; i++) {
1148                                 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1149                                 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1150                                 remote_find_tracking(ret->remote,
1151                                                      ret->merge[i]);
1152                         }
1153                 }
1154         }
1155         return ret;
1156 }
1157
1158 int branch_has_merge_config(struct branch *branch)
1159 {
1160         return branch && !!branch->merge;
1161 }
1162
1163 int branch_merge_matches(struct branch *branch,
1164                                  int i,
1165                                  const char *refname)
1166 {
1167         if (!branch || i < 0 || i >= branch->merge_nr)
1168                 return 0;
1169         return refname_match(branch->merge[i]->src, refname, ref_fetch_rules);
1170 }
1171
1172 static struct ref *get_expanded_map(const struct ref *remote_refs,
1173                                     const struct refspec *refspec)
1174 {
1175         const struct ref *ref;
1176         struct ref *ret = NULL;
1177         struct ref **tail = &ret;
1178
1179         char *expn_name;
1180
1181         for (ref = remote_refs; ref; ref = ref->next) {
1182                 if (strchr(ref->name, '^'))
1183                         continue; /* a dereference item */
1184                 if (match_name_with_pattern(refspec->src, ref->name,
1185                                             refspec->dst, &expn_name)) {
1186                         struct ref *cpy = copy_ref(ref);
1187
1188                         cpy->peer_ref = alloc_ref(expn_name);
1189                         free(expn_name);
1190                         if (refspec->force)
1191                                 cpy->peer_ref->force = 1;
1192                         *tail = cpy;
1193                         tail = &cpy->next;
1194                 }
1195         }
1196
1197         return ret;
1198 }
1199
1200 static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1201 {
1202         const struct ref *ref;
1203         for (ref = refs; ref; ref = ref->next) {
1204                 if (refname_match(name, ref->name, ref_fetch_rules))
1205                         return ref;
1206         }
1207         return NULL;
1208 }
1209
1210 struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1211 {
1212         const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1213
1214         if (!ref)
1215                 return NULL;
1216
1217         return copy_ref(ref);
1218 }
1219
1220 static struct ref *get_local_ref(const char *name)
1221 {
1222         if (!name)
1223                 return NULL;
1224
1225         if (!prefixcmp(name, "refs/"))
1226                 return alloc_ref(name);
1227
1228         if (!prefixcmp(name, "heads/") ||
1229             !prefixcmp(name, "tags/") ||
1230             !prefixcmp(name, "remotes/"))
1231                 return alloc_ref_with_prefix("refs/", 5, name);
1232
1233         return alloc_ref_with_prefix("refs/heads/", 11, name);
1234 }
1235
1236 int get_fetch_map(const struct ref *remote_refs,
1237                   const struct refspec *refspec,
1238                   struct ref ***tail,
1239                   int missing_ok)
1240 {
1241         struct ref *ref_map, **rmp;
1242
1243         if (refspec->pattern) {
1244                 ref_map = get_expanded_map(remote_refs, refspec);
1245         } else {
1246                 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1247
1248                 ref_map = get_remote_ref(remote_refs, name);
1249                 if (!missing_ok && !ref_map)
1250                         die("Couldn't find remote ref %s", name);
1251                 if (ref_map) {
1252                         ref_map->peer_ref = get_local_ref(refspec->dst);
1253                         if (ref_map->peer_ref && refspec->force)
1254                                 ref_map->peer_ref->force = 1;
1255                 }
1256         }
1257
1258         for (rmp = &ref_map; *rmp; ) {
1259                 if ((*rmp)->peer_ref) {
1260                         int st = check_ref_format((*rmp)->peer_ref->name + 5);
1261                         if (st && st != CHECK_REF_FORMAT_ONELEVEL) {
1262                                 struct ref *ignore = *rmp;
1263                                 error("* Ignoring funny ref '%s' locally",
1264                                       (*rmp)->peer_ref->name);
1265                                 *rmp = (*rmp)->next;
1266                                 free(ignore->peer_ref);
1267                                 free(ignore);
1268                                 continue;
1269                         }
1270                 }
1271                 rmp = &((*rmp)->next);
1272         }
1273
1274         if (ref_map)
1275                 tail_link_ref(ref_map, tail);
1276
1277         return 0;
1278 }
1279
1280 int resolve_remote_symref(struct ref *ref, struct ref *list)
1281 {
1282         if (!ref->symref)
1283                 return 0;
1284         for (; list; list = list->next)
1285                 if (!strcmp(ref->symref, list->name)) {
1286                         hashcpy(ref->old_sha1, list->old_sha1);
1287                         return 0;
1288                 }
1289         return 1;
1290 }
1291
1292 /*
1293  * Return true if there is anything to report, otherwise false.
1294  */
1295 int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs)
1296 {
1297         unsigned char sha1[20];
1298         struct commit *ours, *theirs;
1299         char symmetric[84];
1300         struct rev_info revs;
1301         const char *rev_argv[10], *base;
1302         int rev_argc;
1303
1304         /*
1305          * Nothing to report unless we are marked to build on top of
1306          * somebody else.
1307          */
1308         if (!branch ||
1309             !branch->merge || !branch->merge[0] || !branch->merge[0]->dst)
1310                 return 0;
1311
1312         /*
1313          * If what we used to build on no longer exists, there is
1314          * nothing to report.
1315          */
1316         base = branch->merge[0]->dst;
1317         if (!resolve_ref(base, sha1, 1, NULL))
1318                 return 0;
1319         theirs = lookup_commit(sha1);
1320         if (!theirs)
1321                 return 0;
1322
1323         if (!resolve_ref(branch->refname, sha1, 1, NULL))
1324                 return 0;
1325         ours = lookup_commit(sha1);
1326         if (!ours)
1327                 return 0;
1328
1329         /* are we the same? */
1330         if (theirs == ours)
1331                 return 0;
1332
1333         /* Run "rev-list --left-right ours...theirs" internally... */
1334         rev_argc = 0;
1335         rev_argv[rev_argc++] = NULL;
1336         rev_argv[rev_argc++] = "--left-right";
1337         rev_argv[rev_argc++] = symmetric;
1338         rev_argv[rev_argc++] = "--";
1339         rev_argv[rev_argc] = NULL;
1340
1341         strcpy(symmetric, sha1_to_hex(ours->object.sha1));
1342         strcpy(symmetric + 40, "...");
1343         strcpy(symmetric + 43, sha1_to_hex(theirs->object.sha1));
1344
1345         init_revisions(&revs, NULL);
1346         setup_revisions(rev_argc, rev_argv, &revs, NULL);
1347         prepare_revision_walk(&revs);
1348
1349         /* ... and count the commits on each side. */
1350         *num_ours = 0;
1351         *num_theirs = 0;
1352         while (1) {
1353                 struct commit *c = get_revision(&revs);
1354                 if (!c)
1355                         break;
1356                 if (c->object.flags & SYMMETRIC_LEFT)
1357                         (*num_ours)++;
1358                 else
1359                         (*num_theirs)++;
1360         }
1361
1362         /* clear object flags smudged by the above traversal */
1363         clear_commit_marks(ours, ALL_REV_FLAGS);
1364         clear_commit_marks(theirs, ALL_REV_FLAGS);
1365         return 1;
1366 }
1367
1368 /*
1369  * Return true when there is anything to report, otherwise false.
1370  */
1371 int format_tracking_info(struct branch *branch, struct strbuf *sb)
1372 {
1373         int num_ours, num_theirs;
1374         const char *base;
1375
1376         if (!stat_tracking_info(branch, &num_ours, &num_theirs))
1377                 return 0;
1378
1379         base = branch->merge[0]->dst;
1380         if (!prefixcmp(base, "refs/remotes/")) {
1381                 base += strlen("refs/remotes/");
1382         }
1383         if (!num_theirs)
1384                 strbuf_addf(sb, "Your branch is ahead of '%s' "
1385                             "by %d commit%s.\n",
1386                             base, num_ours, (num_ours == 1) ? "" : "s");
1387         else if (!num_ours)
1388                 strbuf_addf(sb, "Your branch is behind '%s' "
1389                             "by %d commit%s, "
1390                             "and can be fast-forwarded.\n",
1391                             base, num_theirs, (num_theirs == 1) ? "" : "s");
1392         else
1393                 strbuf_addf(sb, "Your branch and '%s' have diverged,\n"
1394                             "and have %d and %d different commit(s) each, "
1395                             "respectively.\n",
1396                             base, num_ours, num_theirs);
1397         return 1;
1398 }