remote.c

   1 #include "cache.h"
   2 #include "remote.h"
   3 #include "refs.h"
   4
   5 static struct remote **remotes;
   6 static int allocated_remotes;
   7
   8 static struct branch **branches;
   9 static int allocated_branches;
  10
  11 static struct branch *current_branch;
  12 static const char *default_remote_name;
  13
  14 #define BUF_SIZE (2048)
  15 static char buffer[BUF_SIZE];
  16
  17 static void add_push_refspec(struct remote *remote, const char *ref)
  18 {
  19         int nr = remote->push_refspec_nr + 1;
  20         remote->push_refspec =
  21                 xrealloc(remote->push_refspec, nr * sizeof(char *));
  22         remote->push_refspec[nr-1] = ref;
  23         remote->push_refspec_nr = nr;
  24 }
  25
  26 static void add_fetch_refspec(struct remote *remote, const char *ref)
  27 {
  28         int nr = remote->fetch_refspec_nr + 1;
  29         remote->fetch_refspec =
  30                 xrealloc(remote->fetch_refspec, nr * sizeof(char *));
  31         remote->fetch_refspec[nr-1] = ref;
  32         remote->fetch_refspec_nr = nr;
  33 }
  34
  35 static void add_url(struct remote *remote, const char *url)
  36 {
  37         int nr = remote->url_nr + 1;
  38         remote->url =
  39                 xrealloc(remote->url, nr * sizeof(char *));
  40         remote->url[nr-1] = url;
  41         remote->url_nr = nr;
  42 }
  43
  44 static struct remote *make_remote(const char *name, int len)
  45 {
  46         int i, empty = -1;
  47
  48         for (i = 0; i < allocated_remotes; i++) {
  49                 if (!remotes[i]) {
  50                         if (empty < 0)
  51                                 empty = i;
  52                 } else {
  53                         if (len ? (!strncmp(name, remotes[i]->name, len) &&
  54                                    !remotes[i]->name[len]) :
  55                             !strcmp(name, remotes[i]->name))
  56                                 return remotes[i];
  57                 }
  58         }
  59
  60         if (empty < 0) {
  61                 empty = allocated_remotes;
  62                 allocated_remotes += allocated_remotes ? allocated_remotes : 1;
  63                 remotes = xrealloc(remotes,
  64                                    sizeof(*remotes) * allocated_remotes);
  65                 memset(remotes + empty, 0,
  66                        (allocated_remotes - empty) * sizeof(*remotes));
  67         }
  68         remotes[empty] = xcalloc(1, sizeof(struct remote));
  69         if (len)
  70                 remotes[empty]->name = xstrndup(name, len);
  71         else
  72                 remotes[empty]->name = xstrdup(name);
  73         return remotes[empty];
  74 }
  75
  76 static void add_merge(struct branch *branch, const char *name)
  77 {
  78         int nr = branch->merge_nr + 1;
  79         branch->merge_name =
  80                 xrealloc(branch->merge_name, nr * sizeof(char *));
  81         branch->merge_name[nr-1] = name;
  82         branch->merge_nr = nr;
  83 }
  84
  85 static struct branch *make_branch(const char *name, int len)
  86 {
  87         int i, empty = -1;
  88         char *refname;
  89
  90         for (i = 0; i < allocated_branches; i++) {
  91                 if (!branches[i]) {
  92                         if (empty < 0)
  93                                 empty = i;
  94                 } else {
  95                         if (len ? (!strncmp(name, branches[i]->name, len) &&
  96                                    !branches[i]->name[len]) :
  97                             !strcmp(name, branches[i]->name))
  98                                 return branches[i];
  99                 }
 100         }
 101
 102         if (empty < 0) {
 103                 empty = allocated_branches;
 104                 allocated_branches += allocated_branches ? allocated_branches : 1;
 105                 branches = xrealloc(branches,
 106                                    sizeof(*branches) * allocated_branches);
 107                 memset(branches + empty, 0,
 108                        (allocated_branches - empty) * sizeof(*branches));
 109         }
 110         branches[empty] = xcalloc(1, sizeof(struct branch));
 111         if (len)
 112                 branches[empty]->name = xstrndup(name, len);
 113         else
 114                 branches[empty]->name = xstrdup(name);
 115         refname = malloc(strlen(name) + strlen("refs/heads/") + 1);
 116         strcpy(refname, "refs/heads/");
 117         strcpy(refname + strlen("refs/heads/"),
 118                branches[empty]->name);
 119         branches[empty]->refname = refname;
 120
 121         return branches[empty];
 122 }
 123
 124 static void read_remotes_file(struct remote *remote)
 125 {
 126         FILE *f = fopen(git_path("remotes/%s", remote->name), "r");
 127
 128         if (!f)
 129                 return;
 130         while (fgets(buffer, BUF_SIZE, f)) {
 131                 int value_list;
 132                 char *s, *p;
 133
 134                 if (!prefixcmp(buffer, "URL:")) {
 135                         value_list = 0;
 136                         s = buffer + 4;
 137                 } else if (!prefixcmp(buffer, "Push:")) {
 138                         value_list = 1;
 139                         s = buffer + 5;
 140                 } else if (!prefixcmp(buffer, "Pull:")) {
 141                         value_list = 2;
 142                         s = buffer + 5;
 143                 } else
 144                         continue;
 145
 146                 while (isspace(*s))
 147                         s++;
 148                 if (!*s)
 149                         continue;
 150
 151                 p = s + strlen(s);
 152                 while (isspace(p[-1]))
 153                         *--p = 0;
 154
 155                 switch (value_list) {
 156                 case 0:
 157                         add_url(remote, xstrdup(s));
 158                         break;
 159                 case 1:
 160                         add_push_refspec(remote, xstrdup(s));
 161                         break;
 162                 case 2:
 163                         add_fetch_refspec(remote, xstrdup(s));
 164                         break;
 165                 }
 166         }
 167         fclose(f);
 168 }
 169
 170 static void read_branches_file(struct remote *remote)
 171 {
 172         const char *slash = strchr(remote->name, '/');
 173         char *frag;
 174         char *branch;
 175         int n = slash ? slash - remote->name : 1000;
 176         FILE *f = fopen(git_path("branches/%.*s", n, remote->name), "r");
 177         char *s, *p;
 178         int len;
 179
 180         if (!f)
 181                 return;
 182         s = fgets(buffer, BUF_SIZE, f);
 183         fclose(f);
 184         if (!s)
 185                 return;
 186         while (isspace(*s))
 187                 s++;
 188         if (!*s)
 189                 return;
 190         p = s + strlen(s);
 191         while (isspace(p[-1]))
 192                 *--p = 0;
 193         len = p - s;
 194         if (slash)
 195                 len += strlen(slash);
 196         p = xmalloc(len + 1);
 197         strcpy(p, s);
 198         if (slash)
 199                 strcat(p, slash);
 200         frag = strchr(p, '#');
 201         if (frag) {
 202                 *(frag++) = '\0';
 203                 branch = xmalloc(strlen(frag) + 12);
 204                 strcpy(branch, "refs/heads/");
 205                 strcat(branch, frag);
 206         } else {
 207                 branch = "refs/heads/master";
 208         }
 209         add_url(remote, p);
 210         add_fetch_refspec(remote, branch);
 211         remote->fetch_tags = 1; /* always auto-follow */
 212 }
 213
 214 static int handle_config(const char *key, const char *value)
 215 {
 216         const char *name;
 217         const char *subkey;
 218         struct remote *remote;
 219         struct branch *branch;
 220         if (!prefixcmp(key, "branch.")) {
 221                 name = key + 7;
 222                 subkey = strrchr(name, '.');
 223                 branch = make_branch(name, subkey - name);
 224                 if (!subkey)
 225                         return 0;
 226                 if (!value)
 227                         return 0;
 228                 if (!strcmp(subkey, ".remote")) {
 229                         branch->remote_name = xstrdup(value);
 230                         if (branch == current_branch)
 231                                 default_remote_name = branch->remote_name;
 232                 } else if (!strcmp(subkey, ".merge"))
 233                         add_merge(branch, xstrdup(value));
 234                 return 0;
 235         }
 236         if (prefixcmp(key,  "remote."))
 237                 return 0;
 238         name = key + 7;
 239         subkey = strrchr(name, '.');
 240         if (!subkey)
 241                 return error("Config with no key for remote %s", name);
 242         if (*subkey == '/') {
 243                 warning("Config remote shorthand cannot begin with '/': %s", name);
 244                 return 0;
 245         }
 246         remote = make_remote(name, subkey - name);
 247         if (!value) {
 248                 /* if we ever have a boolean variable, e.g. "remote.*.disabled"
 249                  * [remote "frotz"]
 250                  *      disabled
 251                  * is a valid way to set it to true; we get NULL in value so
 252                  * we need to handle it here.
 253                  *
 254                  * if (!strcmp(subkey, ".disabled")) {
 255                  *      val = git_config_bool(key, value);
 256                  *      return 0;
 257                  * } else
 258                  *
 259                  */
 260                 return 0; /* ignore unknown booleans */
 261         }
 262         if (!strcmp(subkey, ".url")) {
 263                 add_url(remote, xstrdup(value));
 264         } else if (!strcmp(subkey, ".push")) {
 265                 add_push_refspec(remote, xstrdup(value));
 266         } else if (!strcmp(subkey, ".fetch")) {
 267                 add_fetch_refspec(remote, xstrdup(value));
 268         } else if (!strcmp(subkey, ".receivepack")) {
 269                 if (!remote->receivepack)
 270                         remote->receivepack = xstrdup(value);
 271                 else
 272                         error("more than one receivepack given, using the first");
 273         } else if (!strcmp(subkey, ".uploadpack")) {
 274                 if (!remote->uploadpack)
 275                         remote->uploadpack = xstrdup(value);
 276                 else
 277                         error("more than one uploadpack given, using the first");
 278         } else if (!strcmp(subkey, ".tagopt")) {
 279                 if (!strcmp(value, "--no-tags"))
 280                         remote->fetch_tags = -1;
 281         } else if (!strcmp(subkey, ".proxy")) {
 282                 remote->http_proxy = xstrdup(value);
 283         }
 284         return 0;
 285 }
 286
 287 static void read_config(void)
 288 {
 289         unsigned char sha1[20];
 290         const char *head_ref;
 291         int flag;
 292         if (default_remote_name) // did this already
 293                 return;
 294         default_remote_name = xstrdup("origin");
 295         current_branch = NULL;
 296         head_ref = resolve_ref("HEAD", sha1, 0, &flag);
 297         if (head_ref && (flag & REF_ISSYMREF) &&
 298             !prefixcmp(head_ref, "refs/heads/")) {
 299                 current_branch =
 300                         make_branch(head_ref + strlen("refs/heads/"), 0);
 301         }
 302         git_config(handle_config);
 303 }
 304
 305 struct refspec *parse_ref_spec(int nr_refspec, const char **refspec)
 306 {
 307         int i;
 308         struct refspec *rs = xcalloc(sizeof(*rs), nr_refspec);
 309         for (i = 0; i < nr_refspec; i++) {
 310                 const char *sp, *ep, *gp;
 311                 sp = refspec[i];
 312                 if (*sp == '+') {
 313                         rs[i].force = 1;
 314                         sp++;
 315                 }
 316                 gp = strchr(sp, '*');
 317                 ep = strchr(sp, ':');
 318                 if (gp && ep && gp > ep)
 319                         gp = NULL;
 320                 if (ep) {
 321                         if (ep[1]) {
 322                                 const char *glob = strchr(ep + 1, '*');
 323                                 if (!glob)
 324                                         gp = NULL;
 325                                 if (gp)
 326                                         rs[i].dst = xstrndup(ep + 1,
 327                                                              glob - ep - 1);
 328                                 else
 329                                         rs[i].dst = xstrdup(ep + 1);
 330                         }
 331                 } else {
 332                         ep = sp + strlen(sp);
 333                 }
 334                 if (gp) {
 335                         rs[i].pattern = 1;
 336                         ep = gp;
 337                 }
 338                 rs[i].src = xstrndup(sp, ep - sp);
 339         }
 340         return rs;
 341 }
 342
 343 struct remote *remote_get(const char *name)
 344 {
 345         struct remote *ret;
 346
 347         read_config();
 348         if (!name)
 349                 name = default_remote_name;
 350         ret = make_remote(name, 0);
 351         if (name[0] != '/') {
 352                 if (!ret->url)
 353                         read_remotes_file(ret);
 354                 if (!ret->url)
 355                         read_branches_file(ret);
 356         }
 357         if (!ret->url)
 358                 add_url(ret, name);
 359         if (!ret->url)
 360                 return NULL;
 361         ret->fetch = parse_ref_spec(ret->fetch_refspec_nr, ret->fetch_refspec);
 362         ret->push = parse_ref_spec(ret->push_refspec_nr, ret->push_refspec);
 363         return ret;
 364 }
 365
 366 int for_each_remote(each_remote_fn fn, void *priv)
 367 {
 368         int i, result = 0;
 369         read_config();
 370         for (i = 0; i < allocated_remotes && !result; i++) {
 371                 struct remote *r = remotes[i];
 372                 if (!r)
 373                         continue;
 374                 if (!r->fetch)
 375                         r->fetch = parse_ref_spec(r->fetch_refspec_nr,
 376                                         r->fetch_refspec);
 377                 if (!r->push)
 378                         r->push = parse_ref_spec(r->push_refspec_nr,
 379                                         r->push_refspec);
 380                 result = fn(r, priv);
 381         }
 382         return result;
 383 }
 384
 385 void ref_remove_duplicates(struct ref *ref_map)
 386 {
 387         struct ref **posn;
 388         struct ref *next;
 389         for (; ref_map; ref_map = ref_map->next) {
 390                 if (!ref_map->peer_ref)
 391                         continue;
 392                 posn = &ref_map->next;
 393                 while (*posn) {
 394                         if ((*posn)->peer_ref &&
 395                             !strcmp((*posn)->peer_ref->name,
 396                                     ref_map->peer_ref->name)) {
 397                                 if (strcmp((*posn)->name, ref_map->name))
 398                                         die("%s tracks both %s and %s",
 399                                             ref_map->peer_ref->name,
 400                                             (*posn)->name, ref_map->name);
 401                                 next = (*posn)->next;
 402                                 free((*posn)->peer_ref);
 403                                 free(*posn);
 404                                 *posn = next;
 405                         } else {
 406                                 posn = &(*posn)->next;
 407                         }
 408                 }
 409         }
 410 }
 411
 412 int remote_has_url(struct remote *remote, const char *url)
 413 {
 414         int i;
 415         for (i = 0; i < remote->url_nr; i++) {
 416                 if (!strcmp(remote->url[i], url))
 417                         return 1;
 418         }
 419         return 0;
 420 }
 421
 422 /*
 423  * Returns true if, under the matching rules for fetching, name is the
 424  * same as the given full name.
 425  */
 426 static int ref_matches_abbrev(const char *name, const char *full)
 427 {
 428         if (!prefixcmp(name, "refs/") || !strcmp(name, "HEAD"))
 429                 return !strcmp(name, full);
 430         if (prefixcmp(full, "refs/"))
 431                 return 0;
 432         if (!prefixcmp(name, "heads/") ||
 433             !prefixcmp(name, "tags/") ||
 434             !prefixcmp(name, "remotes/"))
 435                 return !strcmp(name, full + 5);
 436         if (prefixcmp(full + 5, "heads/"))
 437                 return 0;
 438         return !strcmp(full + 11, name);
 439 }
 440
 441 int remote_find_tracking(struct remote *remote, struct refspec *refspec)
 442 {
 443         int find_src = refspec->src == NULL;
 444         char *needle, **result;
 445         int i;
 446
 447         if (find_src) {
 448                 if (!refspec->dst)
 449                         return error("find_tracking: need either src or dst");
 450                 needle = refspec->dst;
 451                 result = &refspec->src;
 452         } else {
 453                 needle = refspec->src;
 454                 result = &refspec->dst;
 455         }
 456
 457         for (i = 0; i < remote->fetch_refspec_nr; i++) {
 458                 struct refspec *fetch = &remote->fetch[i];
 459                 const char *key = find_src ? fetch->dst : fetch->src;
 460                 const char *value = find_src ? fetch->src : fetch->dst;
 461                 if (!fetch->dst)
 462                         continue;
 463                 if (fetch->pattern) {
 464                         if (!prefixcmp(needle, key)) {
 465                                 *result = xmalloc(strlen(value) +
 466                                                   strlen(needle) -
 467                                                   strlen(key) + 1);
 468                                 strcpy(*result, value);
 469                                 strcpy(*result + strlen(value),
 470                                        needle + strlen(key));
 471                                 refspec->force = fetch->force;
 472                                 return 0;
 473                         }
 474                 } else if (!strcmp(needle, key)) {
 475                         *result = xstrdup(value);
 476                         refspec->force = fetch->force;
 477                         return 0;
 478                 }
 479         }
 480         return -1;
 481 }
 482
 483 struct ref *alloc_ref(unsigned namelen)
 484 {
 485         struct ref *ret = xmalloc(sizeof(struct ref) + namelen);
 486         memset(ret, 0, sizeof(struct ref) + namelen);
 487         return ret;
 488 }
 489
 490 static struct ref *copy_ref(const struct ref *ref)
 491 {
 492         struct ref *ret = xmalloc(sizeof(struct ref) + strlen(ref->name) + 1);
 493         memcpy(ret, ref, sizeof(struct ref) + strlen(ref->name) + 1);
 494         ret->next = NULL;
 495         return ret;
 496 }
 497
 498 struct ref *copy_ref_list(const struct ref *ref)
 499 {
 500         struct ref *ret = NULL;
 501         struct ref **tail = &ret;
 502         while (ref) {
 503                 *tail = copy_ref(ref);
 504                 ref = ref->next;
 505                 tail = &((*tail)->next);
 506         }
 507         return ret;
 508 }
 509
 510 void free_refs(struct ref *ref)
 511 {
 512         struct ref *next;
 513         while (ref) {
 514                 next = ref->next;
 515                 if (ref->peer_ref)
 516                         free(ref->peer_ref);
 517                 free(ref);
 518                 ref = next;
 519         }
 520 }
 521
 522 static int count_refspec_match(const char *pattern,
 523                                struct ref *refs,
 524                                struct ref **matched_ref)
 525 {
 526         int patlen = strlen(pattern);
 527         struct ref *matched_weak = NULL;
 528         struct ref *matched = NULL;
 529         int weak_match = 0;
 530         int match = 0;
 531
 532         for (weak_match = match = 0; refs; refs = refs->next) {
 533                 char *name = refs->name;
 534                 int namelen = strlen(name);
 535
 536                 if (namelen < patlen ||
 537                     memcmp(name + namelen - patlen, pattern, patlen))
 538                         continue;
 539                 if (namelen != patlen && name[namelen - patlen - 1] != '/')
 540                         continue;
 541
 542                 /* A match is "weak" if it is with refs outside
 543                  * heads or tags, and did not specify the pattern
 544                  * in full (e.g. "refs/remotes/origin/master") or at
 545                  * least from the toplevel (e.g. "remotes/origin/master");
 546                  * otherwise "git push $URL master" would result in
 547                  * ambiguity between remotes/origin/master and heads/master
 548                  * at the remote site.
 549                  */
 550                 if (namelen != patlen &&
 551                     patlen != namelen - 5 &&
 552                     prefixcmp(name, "refs/heads/") &&
 553                     prefixcmp(name, "refs/tags/")) {
 554                         /* We want to catch the case where only weak
 555                          * matches are found and there are multiple
 556                          * matches, and where more than one strong
 557                          * matches are found, as ambiguous.  One
 558                          * strong match with zero or more weak matches
 559                          * are acceptable as a unique match.
 560                          */
 561                         matched_weak = refs;
 562                         weak_match++;
 563                 }
 564                 else {
 565                         matched = refs;
 566                         match++;
 567                 }
 568         }
 569         if (!matched) {
 570                 *matched_ref = matched_weak;
 571                 return weak_match;
 572         }
 573         else {
 574                 *matched_ref = matched;
 575                 return match;
 576         }
 577 }
 578
 579 static void tail_link_ref(struct ref *ref, struct ref ***tail)
 580 {
 581         **tail = ref;
 582         while (ref->next)
 583                 ref = ref->next;
 584         *tail = &ref->next;
 585 }
 586
 587 static struct ref *try_explicit_object_name(const char *name)
 588 {
 589         unsigned char sha1[20];
 590         struct ref *ref;
 591         int len;
 592
 593         if (!*name) {
 594                 ref = alloc_ref(20);
 595                 strcpy(ref->name, "(delete)");
 596                 hashclr(ref->new_sha1);
 597                 return ref;
 598         }
 599         if (get_sha1(name, sha1))
 600                 return NULL;
 601         len = strlen(name) + 1;
 602         ref = alloc_ref(len);
 603         memcpy(ref->name, name, len);
 604         hashcpy(ref->new_sha1, sha1);
 605         return ref;
 606 }
 607
 608 static struct ref *make_linked_ref(const char *name, struct ref ***tail)
 609 {
 610         struct ref *ret;
 611         size_t len;
 612
 613         len = strlen(name) + 1;
 614         ret = alloc_ref(len);
 615         memcpy(ret->name, name, len);
 616         tail_link_ref(ret, tail);
 617         return ret;
 618 }
 619
 620 static int match_explicit(struct ref *src, struct ref *dst,
 621                           struct ref ***dst_tail,
 622                           struct refspec *rs,
 623                           int errs)
 624 {
 625         struct ref *matched_src, *matched_dst;
 626
 627         const char *dst_value = rs->dst;
 628
 629         if (rs->pattern)
 630                 return errs;
 631
 632         matched_src = matched_dst = NULL;
 633         switch (count_refspec_match(rs->src, src, &matched_src)) {
 634         case 1:
 635                 break;
 636         case 0:
 637                 /* The source could be in the get_sha1() format
 638                  * not a reference name.  :refs/other is a
 639                  * way to delete 'other' ref at the remote end.
 640                  */
 641                 matched_src = try_explicit_object_name(rs->src);
 642                 if (!matched_src)
 643                         error("src refspec %s does not match any.", rs->src);
 644                 break;
 645         default:
 646                 matched_src = NULL;
 647                 error("src refspec %s matches more than one.", rs->src);
 648                 break;
 649         }
 650
 651         if (!matched_src)
 652                 errs = 1;
 653
 654         if (!dst_value) {
 655                 if (!matched_src)
 656                         return errs;
 657                 dst_value = matched_src->name;
 658         }
 659
 660         switch (count_refspec_match(dst_value, dst, &matched_dst)) {
 661         case 1:
 662                 break;
 663         case 0:
 664                 if (!memcmp(dst_value, "refs/", 5))
 665                         matched_dst = make_linked_ref(dst_value, dst_tail);
 666                 else
 667                         error("dst refspec %s does not match any "
 668                               "existing ref on the remote and does "
 669                               "not start with refs/.", dst_value);
 670                 break;
 671         default:
 672                 matched_dst = NULL;
 673                 error("dst refspec %s matches more than one.",
 674                       dst_value);
 675                 break;
 676         }
 677         if (errs || !matched_dst)
 678                 return 1;
 679         if (matched_dst->peer_ref) {
 680                 errs = 1;
 681                 error("dst ref %s receives from more than one src.",
 682                       matched_dst->name);
 683         }
 684         else {
 685                 matched_dst->peer_ref = matched_src;
 686                 matched_dst->force = rs->force;
 687         }
 688         return errs;
 689 }
 690
 691 static int match_explicit_refs(struct ref *src, struct ref *dst,
 692                                struct ref ***dst_tail, struct refspec *rs,
 693                                int rs_nr)
 694 {
 695         int i, errs;
 696         for (i = errs = 0; i < rs_nr; i++)
 697                 errs |= match_explicit(src, dst, dst_tail, &rs[i], errs);
 698         return -errs;
 699 }
 700
 701 static const struct refspec *check_pattern_match(const struct refspec *rs,
 702                                                  int rs_nr,
 703                                                  const struct ref *src)
 704 {
 705         int i;
 706         for (i = 0; i < rs_nr; i++) {
 707                 if (rs[i].pattern && !prefixcmp(src->name, rs[i].src))
 708                         return rs + i;
 709         }
 710         return NULL;
 711 }
 712
 713 /*
 714  * Note. This is used only by "push"; refspec matching rules for
 715  * push and fetch are subtly different, so do not try to reuse it
 716  * without thinking.
 717  */
 718 int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
 719                int nr_refspec, const char **refspec, int flags)
 720 {
 721         struct refspec *rs =
 722                 parse_ref_spec(nr_refspec, (const char **) refspec);
 723         int send_all = flags & MATCH_REFS_ALL;
 724         int send_mirror = flags & MATCH_REFS_MIRROR;
 725
 726         if (match_explicit_refs(src, dst, dst_tail, rs, nr_refspec))
 727                 return -1;
 728
 729         /* pick the remainder */
 730         for ( ; src; src = src->next) {
 731                 struct ref *dst_peer;
 732                 const struct refspec *pat = NULL;
 733                 char *dst_name;
 734                 if (src->peer_ref)
 735                         continue;
 736                 if (nr_refspec) {
 737                         pat = check_pattern_match(rs, nr_refspec, src);
 738                         if (!pat)
 739                                 continue;
 740                 }
 741                 else if (!send_mirror && prefixcmp(src->name, "refs/heads/"))
 742                         /*
 743                          * "matching refs"; traditionally we pushed everything
 744                          * including refs outside refs/heads/ hierarchy, but
 745                          * that does not make much sense these days.
 746                          */
 747                         continue;
 748
 749                 if (pat) {
 750                         const char *dst_side = pat->dst ? pat->dst : pat->src;
 751                         dst_name = xmalloc(strlen(dst_side) +
 752                                            strlen(src->name) -
 753                                            strlen(pat->src) + 2);
 754                         strcpy(dst_name, dst_side);
 755                         strcat(dst_name, src->name + strlen(pat->src));
 756                 } else
 757                         dst_name = xstrdup(src->name);
 758                 dst_peer = find_ref_by_name(dst, dst_name);
 759                 if (dst_peer && dst_peer->peer_ref)
 760                         /* We're already sending something to this ref. */
 761                         goto free_name;
 762
 763                 if (!dst_peer && !nr_refspec && !(send_all || send_mirror))
 764                         /*
 765                          * Remote doesn't have it, and we have no
 766                          * explicit pattern, and we don't have
 767                          * --all nor --mirror.
 768                          */
 769                         goto free_name;
 770                 if (!dst_peer) {
 771                         /* Create a new one and link it */
 772                         dst_peer = make_linked_ref(dst_name, dst_tail);
 773                         hashcpy(dst_peer->new_sha1, src->new_sha1);
 774                 }
 775                 dst_peer->peer_ref = src;
 776                 if (pat)
 777                         dst_peer->force = pat->force;
 778         free_name:
 779                 free(dst_name);
 780         }
 781         return 0;
 782 }
 783
 784 struct branch *branch_get(const char *name)
 785 {
 786         struct branch *ret;
 787
 788         read_config();
 789         if (!name || !*name || !strcmp(name, "HEAD"))
 790                 ret = current_branch;
 791         else
 792                 ret = make_branch(name, 0);
 793         if (ret && ret->remote_name) {
 794                 ret->remote = remote_get(ret->remote_name);
 795                 if (ret->merge_nr) {
 796                         int i;
 797                         ret->merge = xcalloc(sizeof(*ret->merge),
 798                                              ret->merge_nr);
 799                         for (i = 0; i < ret->merge_nr; i++) {
 800                                 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
 801                                 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
 802                                 remote_find_tracking(ret->remote,
 803                                                      ret->merge[i]);
 804                         }
 805                 }
 806         }
 807         return ret;
 808 }
 809
 810 int branch_has_merge_config(struct branch *branch)
 811 {
 812         return branch && !!branch->merge;
 813 }
 814
 815 int branch_merge_matches(struct branch *branch,
 816                                  int i,
 817                                  const char *refname)
 818 {
 819         if (!branch || i < 0 || i >= branch->merge_nr)
 820                 return 0;
 821         return ref_matches_abbrev(branch->merge[i]->src, refname);
 822 }
 823
 824 static struct ref *get_expanded_map(const struct ref *remote_refs,
 825                                     const struct refspec *refspec)
 826 {
 827         const struct ref *ref;
 828         struct ref *ret = NULL;
 829         struct ref **tail = &ret;
 830
 831         int remote_prefix_len = strlen(refspec->src);
 832         int local_prefix_len = strlen(refspec->dst);
 833
 834         for (ref = remote_refs; ref; ref = ref->next) {
 835                 if (strchr(ref->name, '^'))
 836                         continue; /* a dereference item */
 837                 if (!prefixcmp(ref->name, refspec->src)) {
 838                         const char *match;
 839                         struct ref *cpy = copy_ref(ref);
 840                         match = ref->name + remote_prefix_len;
 841
 842                         cpy->peer_ref = alloc_ref(local_prefix_len +
 843                                                   strlen(match) + 1);
 844                         sprintf(cpy->peer_ref->name, "%s%s",
 845                                 refspec->dst, match);
 846                         if (refspec->force)
 847                                 cpy->peer_ref->force = 1;
 848                         *tail = cpy;
 849                         tail = &cpy->next;
 850                 }
 851         }
 852
 853         return ret;
 854 }
 855
 856 static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
 857 {
 858         const struct ref *ref;
 859         for (ref = refs; ref; ref = ref->next) {
 860                 if (ref_matches_abbrev(name, ref->name))
 861                         return ref;
 862         }
 863         return NULL;
 864 }
 865
 866 struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
 867 {
 868         const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
 869
 870         if (!ref)
 871                 return NULL;
 872
 873         return copy_ref(ref);
 874 }
 875
 876 static struct ref *get_local_ref(const char *name)
 877 {
 878         struct ref *ret;
 879         if (!name)
 880                 return NULL;
 881
 882         if (!prefixcmp(name, "refs/")) {
 883                 ret = alloc_ref(strlen(name) + 1);
 884                 strcpy(ret->name, name);
 885                 return ret;
 886         }
 887
 888         if (!prefixcmp(name, "heads/") ||
 889             !prefixcmp(name, "tags/") ||
 890             !prefixcmp(name, "remotes/")) {
 891                 ret = alloc_ref(strlen(name) + 6);
 892                 sprintf(ret->name, "refs/%s", name);
 893                 return ret;
 894         }
 895
 896         ret = alloc_ref(strlen(name) + 12);
 897         sprintf(ret->name, "refs/heads/%s", name);
 898         return ret;
 899 }
 900
 901 int get_fetch_map(const struct ref *remote_refs,
 902                   const struct refspec *refspec,
 903                   struct ref ***tail,
 904                   int missing_ok)
 905 {
 906         struct ref *ref_map, *rm;
 907
 908         if (refspec->pattern) {
 909                 ref_map = get_expanded_map(remote_refs, refspec);
 910         } else {
 911                 const char *name = refspec->src[0] ? refspec->src : "HEAD";
 912
 913                 ref_map = get_remote_ref(remote_refs, name);
 914                 if (!missing_ok && !ref_map)
 915                         die("Couldn't find remote ref %s", name);
 916                 if (ref_map) {
 917                         ref_map->peer_ref = get_local_ref(refspec->dst);
 918                         if (ref_map->peer_ref && refspec->force)
 919                                 ref_map->peer_ref->force = 1;
 920                 }
 921         }
 922
 923         for (rm = ref_map; rm; rm = rm->next) {
 924                 if (rm->peer_ref && check_ref_format(rm->peer_ref->name + 5))
 925                         die("* refusing to create funny ref '%s' locally",
 926                             rm->peer_ref->name);
 927         }
 928
 929         if (ref_map)
 930                 tail_link_ref(ref_map, tail);
 931
 932         return 0;
 933 }