builtin-fetch.c

   1 /*
   2  * "git fetch"
   3  */
   4 #include "cache.h"
   5 #include "refs.h"
   6 #include "commit.h"
   7 #include "builtin.h"
   8 #include "path-list.h"
   9 #include "remote.h"
  10 #include "transport.h"
  11
  12 static const char fetch_usage[] = "git-fetch [-a | --append] [--upload-pack <upload-pack>] [-f | --force] [--no-tags] [-t | --tags] [-k | --keep] [-u | --update-head-ok] [--depth <depth>] [-v | --verbose] [<repository> <refspec>...]";
  13
  14 static int append, force, tags, no_tags, update_head_ok, verbose, quiet;
  15 static char *default_rla = NULL;
  16 static struct transport *transport;
  17
  18 static void unlock_pack(void)
  19 {
  20         if (transport)
  21                 transport_unlock_pack(transport);
  22 }
  23
  24 static void unlock_pack_on_signal(int signo)
  25 {
  26         unlock_pack();
  27         signal(SIGINT, SIG_DFL);
  28         raise(signo);
  29 }
  30
  31 static void add_merge_config(struct ref **head,
  32                            struct ref *remote_refs,
  33                            struct branch *branch,
  34                            struct ref ***tail)
  35 {
  36         int i;
  37
  38         for (i = 0; i < branch->merge_nr; i++) {
  39                 struct ref *rm, **old_tail = *tail;
  40                 struct refspec refspec;
  41
  42                 for (rm = *head; rm; rm = rm->next) {
  43                         if (branch_merge_matches(branch, i, rm->name)) {
  44                                 rm->merge = 1;
  45                                 break;
  46                         }
  47                 }
  48                 if (rm)
  49                         continue;
  50
  51                 /*
  52                  * Not fetched to a tracking branch?  We need to fetch
  53                  * it anyway to allow this branch's "branch.$name.merge"
  54                  * to be honored by git-pull, but we do not have to
  55                  * fail if branch.$name.merge is misconfigured to point
  56                  * at a nonexisting branch.  If we were indeed called by
  57                  * git-pull, it will notice the misconfiguration because
  58                  * there is no entry in the resulting FETCH_HEAD marked
  59                  * for merging.
  60                  */
  61                 refspec.src = branch->merge[i]->src;
  62                 refspec.dst = NULL;
  63                 refspec.pattern = 0;
  64                 refspec.force = 0;
  65                 get_fetch_map(remote_refs, &refspec, tail, 1);
  66                 for (rm = *old_tail; rm; rm = rm->next)
  67                         rm->merge = 1;
  68         }
  69 }
  70
  71 static struct ref *get_ref_map(struct transport *transport,
  72                                struct refspec *refs, int ref_count, int tags,
  73                                int *autotags)
  74 {
  75         int i;
  76         struct ref *rm;
  77         struct ref *ref_map = NULL;
  78         struct ref **tail = &ref_map;
  79
  80         struct ref *remote_refs = transport_get_remote_refs(transport);
  81
  82         if (ref_count || tags) {
  83                 for (i = 0; i < ref_count; i++) {
  84                         get_fetch_map(remote_refs, &refs[i], &tail, 0);
  85                         if (refs[i].dst && refs[i].dst[0])
  86                                 *autotags = 1;
  87                 }
  88                 /* Merge everything on the command line, but not --tags */
  89                 for (rm = ref_map; rm; rm = rm->next)
  90                         rm->merge = 1;
  91                 if (tags) {
  92                         struct refspec refspec;
  93                         refspec.src = "refs/tags/";
  94                         refspec.dst = "refs/tags/";
  95                         refspec.pattern = 1;
  96                         refspec.force = 0;
  97                         get_fetch_map(remote_refs, &refspec, &tail, 0);
  98                 }
  99         } else {
 100                 /* Use the defaults */
 101                 struct remote *remote = transport->remote;
 102                 struct branch *branch = branch_get(NULL);
 103                 int has_merge = branch_has_merge_config(branch);
 104                 if (remote && (remote->fetch_refspec_nr || has_merge)) {
 105                         for (i = 0; i < remote->fetch_refspec_nr; i++) {
 106                                 get_fetch_map(remote_refs, &remote->fetch[i], &tail, 0);
 107                                 if (remote->fetch[i].dst &&
 108                                     remote->fetch[i].dst[0])
 109                                         *autotags = 1;
 110                                 if (!i && !has_merge && ref_map &&
 111                                     !remote->fetch[0].pattern)
 112                                         ref_map->merge = 1;
 113                         }
 114                         /*
 115                          * if the remote we're fetching from is the same
 116                          * as given in branch.<name>.remote, we add the
 117                          * ref given in branch.<name>.merge, too.
 118                          */
 119                         if (has_merge &&
 120                             !strcmp(branch->remote_name, remote->name))
 121                                 add_merge_config(&ref_map, remote_refs, branch, &tail);
 122                 } else {
 123                         ref_map = get_remote_ref(remote_refs, "HEAD");
 124                         if (!ref_map)
 125                                 die("Couldn't find remote ref HEAD");
 126                         ref_map->merge = 1;
 127                 }
 128         }
 129         ref_remove_duplicates(ref_map);
 130
 131         return ref_map;
 132 }
 133
 134 static void show_new(enum object_type type, unsigned char *sha1_new)
 135 {
 136         fprintf(stderr, "  %s: %s\n", typename(type),
 137                 find_unique_abbrev(sha1_new, DEFAULT_ABBREV));
 138 }
 139
 140 static int s_update_ref(const char *action,
 141                         struct ref *ref,
 142                         int check_old)
 143 {
 144         char msg[1024];
 145         char *rla = getenv("GIT_REFLOG_ACTION");
 146         static struct ref_lock *lock;
 147
 148         if (!rla)
 149                 rla = default_rla;
 150         snprintf(msg, sizeof(msg), "%s: %s", rla, action);
 151         lock = lock_any_ref_for_update(ref->name,
 152                                        check_old ? ref->old_sha1 : NULL, 0);
 153         if (!lock)
 154                 return 1;
 155         if (write_ref_sha1(lock, ref->new_sha1, msg) < 0)
 156                 return 1;
 157         return 0;
 158 }
 159
 160 static int update_local_ref(struct ref *ref,
 161                             const char *note,
 162                             int verbose)
 163 {
 164         char oldh[41], newh[41];
 165         struct commit *current = NULL, *updated;
 166         enum object_type type;
 167         struct branch *current_branch = branch_get(NULL);
 168
 169         type = sha1_object_info(ref->new_sha1, NULL);
 170         if (type < 0)
 171                 die("object %s not found", sha1_to_hex(ref->new_sha1));
 172
 173         if (!*ref->name) {
 174                 /* Not storing */
 175                 if (verbose) {
 176                         fprintf(stderr, "* fetched %s\n", note);
 177                         show_new(type, ref->new_sha1);
 178                 }
 179                 return 0;
 180         }
 181
 182         if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
 183                 if (verbose) {
 184                         fprintf(stderr, "* %s: same as %s\n",
 185                                 ref->name, note);
 186                         show_new(type, ref->new_sha1);
 187                 }
 188                 return 0;
 189         }
 190
 191         if (current_branch &&
 192             !strcmp(ref->name, current_branch->name) &&
 193             !(update_head_ok || is_bare_repository()) &&
 194             !is_null_sha1(ref->old_sha1)) {
 195                 /*
 196                  * If this is the head, and it's not okay to update
 197                  * the head, and the old value of the head isn't empty...
 198                  */
 199                 fprintf(stderr,
 200                         " * %s: Cannot fetch into the current branch.\n",
 201                         ref->name);
 202                 return 1;
 203         }
 204
 205         if (!is_null_sha1(ref->old_sha1) &&
 206             !prefixcmp(ref->name, "refs/tags/")) {
 207                 fprintf(stderr, "* %s: updating with %s\n",
 208                         ref->name, note);
 209                 show_new(type, ref->new_sha1);
 210                 return s_update_ref("updating tag", ref, 0);
 211         }
 212
 213         current = lookup_commit_reference_gently(ref->old_sha1, 1);
 214         updated = lookup_commit_reference_gently(ref->new_sha1, 1);
 215         if (!current || !updated) {
 216                 char *msg;
 217                 if (!strncmp(ref->name, "refs/tags/", 10))
 218                         msg = "storing tag";
 219                 else
 220                         msg = "storing head";
 221                 fprintf(stderr, "* %s: storing %s\n",
 222                         ref->name, note);
 223                 show_new(type, ref->new_sha1);
 224                 return s_update_ref(msg, ref, 0);
 225         }
 226
 227         strcpy(oldh, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 228         strcpy(newh, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 229
 230         if (in_merge_bases(current, &updated, 1)) {
 231                 fprintf(stderr, "* %s: fast forward to %s\n",
 232                         ref->name, note);
 233                 fprintf(stderr, "  old..new: %s..%s\n", oldh, newh);
 234                 return s_update_ref("fast forward", ref, 1);
 235         }
 236         if (!force && !ref->force) {
 237                 fprintf(stderr,
 238                         "* %s: not updating to non-fast forward %s\n",
 239                         ref->name, note);
 240                 fprintf(stderr,
 241                         "  old...new: %s...%s\n", oldh, newh);
 242                 return 1;
 243         }
 244         fprintf(stderr,
 245                 "* %s: forcing update to non-fast forward %s\n",
 246                 ref->name, note);
 247         fprintf(stderr, "  old...new: %s...%s\n", oldh, newh);
 248         return s_update_ref("forced-update", ref, 1);
 249 }
 250
 251 static void store_updated_refs(const char *url, struct ref *ref_map)
 252 {
 253         FILE *fp;
 254         struct commit *commit;
 255         int url_len, i, note_len;
 256         char note[1024];
 257         const char *what, *kind;
 258         struct ref *rm;
 259
 260         fp = fopen(git_path("FETCH_HEAD"), "a");
 261         for (rm = ref_map; rm; rm = rm->next) {
 262                 struct ref *ref = NULL;
 263
 264                 if (rm->peer_ref) {
 265                         ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
 266                         strcpy(ref->name, rm->peer_ref->name);
 267                         hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
 268                         hashcpy(ref->new_sha1, rm->old_sha1);
 269                         ref->force = rm->peer_ref->force;
 270                 }
 271
 272                 commit = lookup_commit_reference_gently(rm->old_sha1, 1);
 273                 if (!commit)
 274                         rm->merge = 0;
 275
 276                 if (!strcmp(rm->name, "HEAD")) {
 277                         kind = "";
 278                         what = "";
 279                 }
 280                 else if (!prefixcmp(rm->name, "refs/heads/")) {
 281                         kind = "branch";
 282                         what = rm->name + 11;
 283                 }
 284                 else if (!prefixcmp(rm->name, "refs/tags/")) {
 285                         kind = "tag";
 286                         what = rm->name + 10;
 287                 }
 288                 else if (!prefixcmp(rm->name, "refs/remotes/")) {
 289                         kind = "remote branch";
 290                         what = rm->name + 13;
 291                 }
 292                 else {
 293                         kind = "";
 294                         what = rm->name;
 295                 }
 296
 297                 url_len = strlen(url);
 298                 for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 299                         ;
 300                 url_len = i + 1;
 301                 if (4 < i && !strncmp(".git", url + i - 3, 4))
 302                         url_len = i - 3;
 303
 304                 note_len = 0;
 305                 if (*what) {
 306                         if (*kind)
 307                                 note_len += sprintf(note + note_len, "%s ",
 308                                                     kind);
 309                         note_len += sprintf(note + note_len, "'%s' of ", what);
 310                 }
 311                 note_len += sprintf(note + note_len, "%.*s", url_len, url);
 312                 fprintf(fp, "%s\t%s\t%s\n",
 313                         sha1_to_hex(commit ? commit->object.sha1 :
 314                                     rm->old_sha1),
 315                         rm->merge ? "" : "not-for-merge",
 316                         note);
 317
 318                 if (ref)
 319                         update_local_ref(ref, note, verbose);
 320         }
 321         fclose(fp);
 322 }
 323
 324 static int fetch_refs(struct transport *transport, struct ref *ref_map)
 325 {
 326         int ret = transport_fetch_refs(transport, ref_map);
 327         if (!ret)
 328                 store_updated_refs(transport->url, ref_map);
 329         transport_unlock_pack(transport);
 330         return ret;
 331 }
 332
 333 static int add_existing(const char *refname, const unsigned char *sha1,
 334                         int flag, void *cbdata)
 335 {
 336         struct path_list *list = (struct path_list *)cbdata;
 337         path_list_insert(refname, list);
 338         return 0;
 339 }
 340
 341 static struct ref *find_non_local_tags(struct transport *transport,
 342                                        struct ref *fetch_map)
 343 {
 344         static struct path_list existing_refs = { NULL, 0, 0, 0 };
 345         struct path_list new_refs = { NULL, 0, 0, 1 };
 346         char *ref_name;
 347         int ref_name_len;
 348         unsigned char *ref_sha1;
 349         struct ref *tag_ref;
 350         struct ref *rm = NULL;
 351         struct ref *ref_map = NULL;
 352         struct ref **tail = &ref_map;
 353         struct ref *ref;
 354
 355         for_each_ref(add_existing, &existing_refs);
 356         for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
 357                 if (prefixcmp(ref->name, "refs/tags"))
 358                         continue;
 359
 360                 ref_name = xstrdup(ref->name);
 361                 ref_name_len = strlen(ref_name);
 362                 ref_sha1 = ref->old_sha1;
 363
 364                 if (!strcmp(ref_name + ref_name_len - 3, "^{}")) {
 365                         ref_name[ref_name_len - 3] = 0;
 366                         tag_ref = transport_get_remote_refs(transport);
 367                         while (tag_ref) {
 368                                 if (!strcmp(tag_ref->name, ref_name)) {
 369                                         ref_sha1 = tag_ref->old_sha1;
 370                                         break;
 371                                 }
 372                                 tag_ref = tag_ref->next;
 373                         }
 374                 }
 375
 376                 if (!path_list_has_path(&existing_refs, ref_name) &&
 377                     !path_list_has_path(&new_refs, ref_name) &&
 378                     lookup_object(ref->old_sha1)) {
 379                         fprintf(stderr, "Auto-following %s\n",
 380                                 ref_name);
 381
 382                         path_list_insert(ref_name, &new_refs);
 383
 384                         rm = alloc_ref(strlen(ref_name) + 1);
 385                         strcpy(rm->name, ref_name);
 386                         rm->peer_ref = alloc_ref(strlen(ref_name) + 1);
 387                         strcpy(rm->peer_ref->name, ref_name);
 388                         hashcpy(rm->old_sha1, ref_sha1);
 389
 390                         *tail = rm;
 391                         tail = &rm->next;
 392                 }
 393                 free(ref_name);
 394         }
 395
 396         return ref_map;
 397 }
 398
 399 static int do_fetch(struct transport *transport,
 400                     struct refspec *refs, int ref_count)
 401 {
 402         struct ref *ref_map, *fetch_map;
 403         struct ref *rm;
 404         int autotags = (transport->remote->fetch_tags == 1);
 405         if (transport->remote->fetch_tags == 2 && !no_tags)
 406                 tags = 1;
 407         if (transport->remote->fetch_tags == -1)
 408                 no_tags = 1;
 409
 410         if (!transport->get_refs_list || !transport->fetch)
 411                 die("Don't know how to fetch from %s", transport->url);
 412
 413         /* if not appending, truncate FETCH_HEAD */
 414         if (!append)
 415                 fclose(fopen(git_path("FETCH_HEAD"), "w"));
 416
 417         ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
 418
 419         for (rm = ref_map; rm; rm = rm->next) {
 420                 if (rm->peer_ref)
 421                         read_ref(rm->peer_ref->name, rm->peer_ref->old_sha1);
 422         }
 423
 424         if (fetch_refs(transport, ref_map)) {
 425                 free_refs(ref_map);
 426                 return 1;
 427         }
 428
 429         fetch_map = ref_map;
 430
 431         /* if neither --no-tags nor --tags was specified, do automated tag
 432          * following ... */
 433         if (!(tags || no_tags) && autotags) {
 434                 ref_map = find_non_local_tags(transport, fetch_map);
 435                 if (ref_map) {
 436                         transport_set_option(transport, TRANS_OPT_DEPTH, "0");
 437                         fetch_refs(transport, ref_map);
 438                 }
 439                 free_refs(ref_map);
 440         }
 441
 442         free_refs(fetch_map);
 443
 444         return 0;
 445 }
 446
 447 static void set_option(const char *name, const char *value)
 448 {
 449         int r = transport_set_option(transport, name, value);
 450         if (r < 0)
 451                 die("Option \"%s\" value \"%s\" is not valid for %s\n",
 452                         name, value, transport->url);
 453         if (r > 0)
 454                 warning("Option \"%s\" is ignored for %s\n",
 455                         name, transport->url);
 456 }
 457
 458 int cmd_fetch(int argc, const char **argv, const char *prefix)
 459 {
 460         struct remote *remote;
 461         int i, j, rla_offset;
 462         static const char **refs = NULL;
 463         int ref_nr = 0;
 464         int cmd_len = 0;
 465         const char *depth = NULL, *upload_pack = NULL;
 466         int keep = 0;
 467
 468         for (i = 1; i < argc; i++) {
 469                 const char *arg = argv[i];
 470                 cmd_len += strlen(arg);
 471
 472                 if (arg[0] != '-')
 473                         break;
 474                 if (!strcmp(arg, "--append") || !strcmp(arg, "-a")) {
 475                         append = 1;
 476                         continue;
 477                 }
 478                 if (!prefixcmp(arg, "--upload-pack=")) {
 479                         upload_pack = arg + 14;
 480                         continue;
 481                 }
 482                 if (!strcmp(arg, "--upload-pack")) {
 483                         i++;
 484                         if (i == argc)
 485                                 usage(fetch_usage);
 486                         upload_pack = argv[i];
 487                         continue;
 488                 }
 489                 if (!strcmp(arg, "--force") || !strcmp(arg, "-f")) {
 490                         force = 1;
 491                         continue;
 492                 }
 493                 if (!strcmp(arg, "--no-tags")) {
 494                         no_tags = 1;
 495                         continue;
 496                 }
 497                 if (!strcmp(arg, "--tags") || !strcmp(arg, "-t")) {
 498                         tags = 1;
 499                         continue;
 500                 }
 501                 if (!strcmp(arg, "--keep") || !strcmp(arg, "-k")) {
 502                         keep = 1;
 503                         continue;
 504                 }
 505                 if (!strcmp(arg, "--update-head-ok") || !strcmp(arg, "-u")) {
 506                         update_head_ok = 1;
 507                         continue;
 508                 }
 509                 if (!prefixcmp(arg, "--depth=")) {
 510                         depth = arg + 8;
 511                         continue;
 512                 }
 513                 if (!strcmp(arg, "--depth")) {
 514                         i++;
 515                         if (i == argc)
 516                                 usage(fetch_usage);
 517                         depth = argv[i];
 518                         continue;
 519                 }
 520                 if (!strcmp(arg, "--quiet")) {
 521                         quiet = 1;
 522                         continue;
 523                 }
 524                 if (!strcmp(arg, "--verbose") || !strcmp(arg, "-v")) {
 525                         verbose++;
 526                         continue;
 527                 }
 528                 usage(fetch_usage);
 529         }
 530
 531         for (j = i; j < argc; j++)
 532                 cmd_len += strlen(argv[j]);
 533
 534         default_rla = xmalloc(cmd_len + 5 + argc + 1);
 535         sprintf(default_rla, "fetch");
 536         rla_offset = strlen(default_rla);
 537         for (j = 1; j < argc; j++) {
 538                 sprintf(default_rla + rla_offset, " %s", argv[j]);
 539                 rla_offset += strlen(argv[j]) + 1;
 540         }
 541
 542         if (i == argc)
 543                 remote = remote_get(NULL);
 544         else
 545                 remote = remote_get(argv[i++]);
 546
 547         transport = transport_get(remote, remote->url[0]);
 548         if (verbose >= 2)
 549                 transport->verbose = 1;
 550         if (quiet)
 551                 transport->verbose = -1;
 552         if (upload_pack)
 553                 set_option(TRANS_OPT_UPLOADPACK, upload_pack);
 554         if (keep)
 555                 set_option(TRANS_OPT_KEEP, "yes");
 556         if (depth)
 557                 set_option(TRANS_OPT_DEPTH, depth);
 558
 559         if (!transport->url)
 560                 die("Where do you want to fetch from today?");
 561
 562         if (i < argc) {
 563                 int j = 0;
 564                 refs = xcalloc(argc - i + 1, sizeof(const char *));
 565                 while (i < argc) {
 566                         if (!strcmp(argv[i], "tag")) {
 567                                 char *ref;
 568                                 i++;
 569                                 ref = xmalloc(strlen(argv[i]) * 2 + 22);
 570                                 strcpy(ref, "refs/tags/");
 571                                 strcat(ref, argv[i]);
 572                                 strcat(ref, ":refs/tags/");
 573                                 strcat(ref, argv[i]);
 574                                 refs[j++] = ref;
 575                         } else
 576                                 refs[j++] = argv[i];
 577                         i++;
 578                 }
 579                 refs[j] = NULL;
 580                 ref_nr = j;
 581         }
 582
 583         signal(SIGINT, unlock_pack_on_signal);
 584         atexit(unlock_pack);
 585         return do_fetch(transport, parse_ref_spec(ref_nr, refs), ref_nr);
 586 }