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