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