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_uri(struct remote *remote, const char *uri)
  36 {
  37         int nr = remote->uri_nr + 1;
  38         remote->uri =
  39                 xrealloc(remote->uri, nr * sizeof(char *));
  40         remote->uri[nr-1] = uri;
  41         remote->uri_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_uri(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_uri(remote, p);
 210         add_fetch_refspec(remote, branch);
 211 }
 212
 213 static int handle_config(const char *key, const char *value)
 214 {
 215         const char *name;
 216         const char *subkey;
 217         struct remote *remote;
 218         struct branch *branch;
 219         if (!prefixcmp(key, "branch.")) {
 220                 name = key + 7;
 221                 subkey = strrchr(name, '.');
 222                 branch = make_branch(name, subkey - name);
 223                 if (!subkey)
 224                         return 0;
 225                 if (!value)
 226                         return 0;
 227                 if (!strcmp(subkey, ".remote")) {
 228                         branch->remote_name = xstrdup(value);
 229                         if (branch == current_branch)
 230                                 default_remote_name = branch->remote_name;
 231                 } else if (!strcmp(subkey, ".merge"))
 232                         add_merge(branch, xstrdup(value));
 233                 return 0;
 234         }
 235         if (prefixcmp(key,  "remote."))
 236                 return 0;
 237         name = key + 7;
 238         subkey = strrchr(name, '.');
 239         if (!subkey)
 240                 return error("Config with no key for remote %s", name);
 241         if (*subkey == '/') {
 242                 warning("Config remote shorthand cannot begin with '/': %s", name);
 243                 return 0;
 244         }
 245         remote = make_remote(name, subkey - name);
 246         if (!value) {
 247                 /* if we ever have a boolean variable, e.g. "remote.*.disabled"
 248                  * [remote "frotz"]
 249                  *      disabled
 250                  * is a valid way to set it to true; we get NULL in value so
 251                  * we need to handle it here.
 252                  *
 253                  * if (!strcmp(subkey, ".disabled")) {
 254                  *      val = git_config_bool(key, value);
 255                  *      return 0;
 256                  * } else
 257                  *
 258                  */
 259                 return 0; /* ignore unknown booleans */
 260         }
 261         if (!strcmp(subkey, ".url")) {
 262                 add_uri(remote, xstrdup(value));
 263         } else if (!strcmp(subkey, ".push")) {
 264                 add_push_refspec(remote, xstrdup(value));
 265         } else if (!strcmp(subkey, ".fetch")) {
 266                 add_fetch_refspec(remote, xstrdup(value));
 267         } else if (!strcmp(subkey, ".receivepack")) {
 268                 if (!remote->receivepack)
 269                         remote->receivepack = xstrdup(value);
 270                 else
 271                         error("more than one receivepack given, using the first");
 272         } else if (!strcmp(subkey, ".uploadpack")) {
 273                 if (!remote->uploadpack)
 274                         remote->uploadpack = xstrdup(value);
 275                 else
 276                         error("more than one uploadpack given, using the first");
 277         }
 278         return 0;
 279 }
 280
 281 static void read_config(void)
 282 {
 283         unsigned char sha1[20];
 284         const char *head_ref;
 285         int flag;
 286         if (default_remote_name) // did this already
 287                 return;
 288         default_remote_name = xstrdup("origin");
 289         current_branch = NULL;
 290         head_ref = resolve_ref("HEAD", sha1, 0, &flag);
 291         if (head_ref && (flag & REF_ISSYMREF) &&
 292             !prefixcmp(head_ref, "refs/heads/")) {
 293                 current_branch =
 294                         make_branch(head_ref + strlen("refs/heads/"), 0);
 295         }
 296         git_config(handle_config);
 297 }
 298
 299 static struct refspec *parse_ref_spec(int nr_refspec, const char **refspec)
 300 {
 301         int i;
 302         struct refspec *rs = xcalloc(sizeof(*rs), nr_refspec);
 303         for (i = 0; i < nr_refspec; i++) {
 304                 const char *sp, *ep, *gp;
 305                 sp = refspec[i];
 306                 if (*sp == '+') {
 307                         rs[i].force = 1;
 308                         sp++;
 309                 }
 310                 gp = strchr(sp, '*');
 311                 ep = strchr(sp, ':');
 312                 if (gp && ep && gp > ep)
 313                         gp = NULL;
 314                 if (ep) {
 315                         if (ep[1]) {
 316                                 const char *glob = strchr(ep + 1, '*');
 317                                 if (!glob)
 318                                         gp = NULL;
 319                                 if (gp)
 320                                         rs[i].dst = xstrndup(ep + 1,
 321                                                              glob - ep - 1);
 322                                 else
 323                                         rs[i].dst = xstrdup(ep + 1);
 324                         }
 325                 } else {
 326                         ep = sp + strlen(sp);
 327                 }
 328                 if (gp) {
 329                         rs[i].pattern = 1;
 330                         ep = gp;
 331                 }
 332                 rs[i].src = xstrndup(sp, ep - sp);
 333         }
 334         return rs;
 335 }
 336
 337 struct remote *remote_get(const char *name)
 338 {
 339         struct remote *ret;
 340
 341         read_config();
 342         if (!name)
 343                 name = default_remote_name;
 344         ret = make_remote(name, 0);
 345         if (name[0] != '/') {
 346                 if (!ret->uri)
 347                         read_remotes_file(ret);
 348                 if (!ret->uri)
 349                         read_branches_file(ret);
 350         }
 351         if (!ret->uri)
 352                 add_uri(ret, name);
 353         if (!ret->uri)
 354                 return NULL;
 355         ret->fetch = parse_ref_spec(ret->fetch_refspec_nr, ret->fetch_refspec);
 356         ret->push = parse_ref_spec(ret->push_refspec_nr, ret->push_refspec);
 357         return ret;
 358 }
 359
 360 int for_each_remote(each_remote_fn fn, void *priv)
 361 {
 362         int i, result = 0;
 363         read_config();
 364         for (i = 0; i < allocated_remotes && !result; i++) {
 365                 struct remote *r = remotes[i];
 366                 if (!r)
 367                         continue;
 368                 if (!r->fetch)
 369                         r->fetch = parse_ref_spec(r->fetch_refspec_nr,
 370                                         r->fetch_refspec);
 371                 if (!r->push)
 372                         r->push = parse_ref_spec(r->push_refspec_nr,
 373                                         r->push_refspec);
 374                 result = fn(r, priv);
 375         }
 376         return result;
 377 }
 378
 379 int remote_has_uri(struct remote *remote, const char *uri)
 380 {
 381         int i;
 382         for (i = 0; i < remote->uri_nr; i++) {
 383                 if (!strcmp(remote->uri[i], uri))
 384                         return 1;
 385         }
 386         return 0;
 387 }
 388
 389 /*
 390  * Returns true if, under the matching rules for fetching, name is the
 391  * same as the given full name.
 392  */
 393 static int ref_matches_abbrev(const char *name, const char *full)
 394 {
 395         if (!prefixcmp(name, "refs/") || !strcmp(name, "HEAD"))
 396                 return !strcmp(name, full);
 397         if (prefixcmp(full, "refs/"))
 398                 return 0;
 399         if (!prefixcmp(name, "heads/") ||
 400             !prefixcmp(name, "tags/") ||
 401             !prefixcmp(name, "remotes/"))
 402                 return !strcmp(name, full + 5);
 403         if (prefixcmp(full + 5, "heads/"))
 404                 return 0;
 405         return !strcmp(full + 11, name);
 406 }
 407
 408 int remote_find_tracking(struct remote *remote, struct refspec *refspec)
 409 {
 410         int find_src = refspec->src == NULL;
 411         char *needle, **result;
 412         int i;
 413
 414         if (find_src) {
 415                 if (refspec->dst == NULL)
 416                         return error("find_tracking: need either src or dst");
 417                 needle = refspec->dst;
 418                 result = &refspec->src;
 419         } else {
 420                 needle = refspec->src;
 421                 result = &refspec->dst;
 422         }
 423
 424         for (i = 0; i < remote->fetch_refspec_nr; i++) {
 425                 struct refspec *fetch = &remote->fetch[i];
 426                 const char *key = find_src ? fetch->dst : fetch->src;
 427                 const char *value = find_src ? fetch->src : fetch->dst;
 428                 if (!fetch->dst)
 429                         continue;
 430                 if (fetch->pattern) {
 431                         if (!prefixcmp(needle, key)) {
 432                                 *result = xmalloc(strlen(value) +
 433                                                   strlen(needle) -
 434                                                   strlen(key) + 1);
 435                                 strcpy(*result, value);
 436                                 strcpy(*result + strlen(value),
 437                                        needle + strlen(key));
 438                                 refspec->force = fetch->force;
 439                                 return 0;
 440                         }
 441                 } else if (!strcmp(needle, key)) {
 442                         *result = xstrdup(value);
 443                         refspec->force = fetch->force;
 444                         return 0;
 445                 }
 446         }
 447         return -1;
 448 }
 449
 450 struct ref *alloc_ref(unsigned namelen)
 451 {
 452         struct ref *ret = xmalloc(sizeof(struct ref) + namelen);
 453         memset(ret, 0, sizeof(struct ref) + namelen);
 454         return ret;
 455 }
 456
 457 void free_refs(struct ref *ref)
 458 {
 459         struct ref *next;
 460         while (ref) {
 461                 next = ref->next;
 462                 if (ref->peer_ref)
 463                         free(ref->peer_ref);
 464                 free(ref);
 465                 ref = next;
 466         }
 467 }
 468
 469 static int count_refspec_match(const char *pattern,
 470                                struct ref *refs,
 471                                struct ref **matched_ref)
 472 {
 473         int patlen = strlen(pattern);
 474         struct ref *matched_weak = NULL;
 475         struct ref *matched = NULL;
 476         int weak_match = 0;
 477         int match = 0;
 478
 479         for (weak_match = match = 0; refs; refs = refs->next) {
 480                 char *name = refs->name;
 481                 int namelen = strlen(name);
 482
 483                 if (namelen < patlen ||
 484                     memcmp(name + namelen - patlen, pattern, patlen))
 485                         continue;
 486                 if (namelen != patlen && name[namelen - patlen - 1] != '/')
 487                         continue;
 488
 489                 /* A match is "weak" if it is with refs outside
 490                  * heads or tags, and did not specify the pattern
 491                  * in full (e.g. "refs/remotes/origin/master") or at
 492                  * least from the toplevel (e.g. "remotes/origin/master");
 493                  * otherwise "git push $URL master" would result in
 494                  * ambiguity between remotes/origin/master and heads/master
 495                  * at the remote site.
 496                  */
 497                 if (namelen != patlen &&
 498                     patlen != namelen - 5 &&
 499                     prefixcmp(name, "refs/heads/") &&
 500                     prefixcmp(name, "refs/tags/")) {
 501                         /* We want to catch the case where only weak
 502                          * matches are found and there are multiple
 503                          * matches, and where more than one strong
 504                          * matches are found, as ambiguous.  One
 505                          * strong match with zero or more weak matches
 506                          * are acceptable as a unique match.
 507                          */
 508                         matched_weak = refs;
 509                         weak_match++;
 510                 }
 511                 else {
 512                         matched = refs;
 513                         match++;
 514                 }
 515         }
 516         if (!matched) {
 517                 *matched_ref = matched_weak;
 518                 return weak_match;
 519         }
 520         else {
 521                 *matched_ref = matched;
 522                 return match;
 523         }
 524 }
 525
 526 static void tail_link_ref(struct ref *ref, struct ref ***tail)
 527 {
 528         **tail = ref;
 529         while (ref->next)
 530                 ref = ref->next;
 531         *tail = &ref->next;
 532 }
 533
 534 static struct ref *try_explicit_object_name(const char *name)
 535 {
 536         unsigned char sha1[20];
 537         struct ref *ref;
 538         int len;
 539
 540         if (!*name) {
 541                 ref = alloc_ref(20);
 542                 strcpy(ref->name, "(delete)");
 543                 hashclr(ref->new_sha1);
 544                 return ref;
 545         }
 546         if (get_sha1(name, sha1))
 547                 return NULL;
 548         len = strlen(name) + 1;
 549         ref = alloc_ref(len);
 550         memcpy(ref->name, name, len);
 551         hashcpy(ref->new_sha1, sha1);
 552         return ref;
 553 }
 554
 555 static struct ref *make_linked_ref(const char *name, struct ref ***tail)
 556 {
 557         struct ref *ret;
 558         size_t len;
 559
 560         len = strlen(name) + 1;
 561         ret = alloc_ref(len);
 562         memcpy(ret->name, name, len);
 563         tail_link_ref(ret, tail);
 564         return ret;
 565 }
 566
 567 static int match_explicit(struct ref *src, struct ref *dst,
 568                           struct ref ***dst_tail,
 569                           struct refspec *rs,
 570                           int errs)
 571 {
 572         struct ref *matched_src, *matched_dst;
 573
 574         const char *dst_value = rs->dst;
 575
 576         if (rs->pattern)
 577                 return errs;
 578
 579         matched_src = matched_dst = NULL;
 580         switch (count_refspec_match(rs->src, src, &matched_src)) {
 581         case 1:
 582                 break;
 583         case 0:
 584                 /* The source could be in the get_sha1() format
 585                  * not a reference name.  :refs/other is a
 586                  * way to delete 'other' ref at the remote end.
 587                  */
 588                 matched_src = try_explicit_object_name(rs->src);
 589                 if (matched_src)
 590                         break;
 591                 error("src refspec %s does not match any.",
 592                       rs->src);
 593                 break;
 594         default:
 595                 matched_src = NULL;
 596                 error("src refspec %s matches more than one.",
 597                       rs->src);
 598                 break;
 599         }
 600
 601         if (!matched_src)
 602                 errs = 1;
 603
 604         if (dst_value == NULL)
 605                 dst_value = matched_src->name;
 606
 607         switch (count_refspec_match(dst_value, dst, &matched_dst)) {
 608         case 1:
 609                 break;
 610         case 0:
 611                 if (!memcmp(dst_value, "refs/", 5))
 612                         matched_dst = make_linked_ref(dst_value, dst_tail);
 613                 else
 614                         error("dst refspec %s does not match any "
 615                               "existing ref on the remote and does "
 616                               "not start with refs/.", dst_value);
 617                 break;
 618         default:
 619                 matched_dst = NULL;
 620                 error("dst refspec %s matches more than one.",
 621                       dst_value);
 622                 break;
 623         }
 624         if (errs || matched_dst == NULL)
 625                 return 1;
 626         if (matched_dst->peer_ref) {
 627                 errs = 1;
 628                 error("dst ref %s receives from more than one src.",
 629                       matched_dst->name);
 630         }
 631         else {
 632                 matched_dst->peer_ref = matched_src;
 633                 matched_dst->force = rs->force;
 634         }
 635         return errs;
 636 }
 637
 638 static int match_explicit_refs(struct ref *src, struct ref *dst,
 639                                struct ref ***dst_tail, struct refspec *rs,
 640                                int rs_nr)
 641 {
 642         int i, errs;
 643         for (i = errs = 0; i < rs_nr; i++)
 644                 errs |= match_explicit(src, dst, dst_tail, &rs[i], errs);
 645         return -errs;
 646 }
 647
 648 static struct ref *find_ref_by_name(struct ref *list, const char *name)
 649 {
 650         for ( ; list; list = list->next)
 651                 if (!strcmp(list->name, name))
 652                         return list;
 653         return NULL;
 654 }
 655
 656 static const struct refspec *check_pattern_match(const struct refspec *rs,
 657                                                  int rs_nr,
 658                                                  const struct ref *src)
 659 {
 660         int i;
 661         for (i = 0; i < rs_nr; i++) {
 662                 if (rs[i].pattern && !prefixcmp(src->name, rs[i].src))
 663                         return rs + i;
 664         }
 665         return NULL;
 666 }
 667
 668 /*
 669  * Note. This is used only by "push"; refspec matching rules for
 670  * push and fetch are subtly different, so do not try to reuse it
 671  * without thinking.
 672  */
 673 int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
 674                int nr_refspec, char **refspec, int all)
 675 {
 676         struct refspec *rs =
 677                 parse_ref_spec(nr_refspec, (const char **) refspec);
 678
 679         if (match_explicit_refs(src, dst, dst_tail, rs, nr_refspec))
 680                 return -1;
 681
 682         /* pick the remainder */
 683         for ( ; src; src = src->next) {
 684                 struct ref *dst_peer;
 685                 const struct refspec *pat = NULL;
 686                 char *dst_name;
 687                 if (src->peer_ref)
 688                         continue;
 689                 if (nr_refspec) {
 690                         pat = check_pattern_match(rs, nr_refspec, src);
 691                         if (!pat)
 692                                 continue;
 693                 }
 694                 else if (prefixcmp(src->name, "refs/heads/"))
 695                         /*
 696                          * "matching refs"; traditionally we pushed everything
 697                          * including refs outside refs/heads/ hierarchy, but
 698                          * that does not make much sense these days.
 699                          */
 700                         continue;
 701
 702                 if (pat) {
 703                         const char *dst_side = pat->dst ? pat->dst : pat->src;
 704                         dst_name = xmalloc(strlen(dst_side) +
 705                                            strlen(src->name) -
 706                                            strlen(pat->src) + 2);
 707                         strcpy(dst_name, dst_side);
 708                         strcat(dst_name, src->name + strlen(pat->src));
 709                 } else
 710                         dst_name = xstrdup(src->name);
 711                 dst_peer = find_ref_by_name(dst, dst_name);
 712                 if (dst_peer && dst_peer->peer_ref)
 713                         /* We're already sending something to this ref. */
 714                         goto free_name;
 715                 if (!dst_peer && !nr_refspec && !all)
 716                         /* Remote doesn't have it, and we have no
 717                          * explicit pattern, and we don't have
 718                          * --all. */
 719                         goto free_name;
 720                 if (!dst_peer) {
 721                         /* Create a new one and link it */
 722                         dst_peer = make_linked_ref(dst_name, dst_tail);
 723                         hashcpy(dst_peer->new_sha1, src->new_sha1);
 724                 }
 725                 dst_peer->peer_ref = src;
 726         free_name:
 727                 free(dst_name);
 728         }
 729         return 0;
 730 }
 731
 732 struct branch *branch_get(const char *name)
 733 {
 734         struct branch *ret;
 735
 736         read_config();
 737         if (!name || !*name || !strcmp(name, "HEAD"))
 738                 ret = current_branch;
 739         else
 740                 ret = make_branch(name, 0);
 741         if (ret && ret->remote_name) {
 742                 ret->remote = remote_get(ret->remote_name);
 743                 if (ret->merge_nr) {
 744                         int i;
 745                         ret->merge = xcalloc(sizeof(*ret->merge),
 746                                              ret->merge_nr);
 747                         for (i = 0; i < ret->merge_nr; i++) {
 748                                 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
 749                                 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
 750                                 remote_find_tracking(ret->remote,
 751                                                      ret->merge[i]);
 752                         }
 753                 }
 754         }
 755         return ret;
 756 }
 757
 758 int branch_has_merge_config(struct branch *branch)
 759 {
 760         return branch && !!branch->merge;
 761 }
 762
 763 int branch_merges(struct branch *branch, const char *refname)
 764 {
 765         int i;
 766         if (!branch)
 767                 return 0;
 768         for (i = 0; i < branch->merge_nr; i++) {
 769                 if (ref_matches_abbrev(branch->merge[i]->src, refname))
 770                         return 1;
 771         }
 772         return 0;
 773 }