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 int s_update_ref(const char *action,
 135                         struct ref *ref,
 136                         int check_old)
 137 {
 138         char msg[1024];
 139         char *rla = getenv("GIT_REFLOG_ACTION");
 140         static struct ref_lock *lock;
 141
 142         if (!rla)
 143                 rla = default_rla;
 144         snprintf(msg, sizeof(msg), "%s: %s", rla, action);
 145         lock = lock_any_ref_for_update(ref->name,
 146                                        check_old ? ref->old_sha1 : NULL, 0);
 147         if (!lock)
 148                 return 1;
 149         if (write_ref_sha1(lock, ref->new_sha1, msg) < 0)
 150                 return 1;
 151         return 0;
 152 }
 153
 154 #define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)
 155 #define REFCOL_WIDTH  10
 156
 157 static int update_local_ref(struct ref *ref,
 158                             const char *remote,
 159                             int verbose,
 160                             char *display)
 161 {
 162         struct commit *current = NULL, *updated;
 163         enum object_type type;
 164         struct branch *current_branch = branch_get(NULL);
 165         const char *pretty_ref = ref->name + (
 166                 !prefixcmp(ref->name, "refs/heads/") ? 11 :
 167                 !prefixcmp(ref->name, "refs/tags/") ? 10 :
 168                 !prefixcmp(ref->name, "refs/remotes/") ? 13 :
 169                 0);
 170
 171         *display = 0;
 172         type = sha1_object_info(ref->new_sha1, NULL);
 173         if (type < 0)
 174                 die("object %s not found", sha1_to_hex(ref->new_sha1));
 175
 176         if (!*ref->name) {
 177                 /* Not storing */
 178                 if (verbose)
 179                         sprintf(display, "* branch %s -> FETCH_HEAD", remote);
 180                 return 0;
 181         }
 182
 183         if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
 184                 if (verbose)
 185                         sprintf(display, "= %-*s %-*s -> %s", SUMMARY_WIDTH,
 186                                 "[up to date]", REFCOL_WIDTH, remote,
 187                                 pretty_ref);
 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                 sprintf(display, "! %-*s %-*s -> %s  (can't fetch in current branch)",
 200                         SUMMARY_WIDTH, "[rejected]", REFCOL_WIDTH, remote,
 201                         pretty_ref);
 202                 return 1;
 203         }
 204
 205         if (!is_null_sha1(ref->old_sha1) &&
 206             !prefixcmp(ref->name, "refs/tags/")) {
 207                 sprintf(display, "- %-*s %-*s -> %s",
 208                         SUMMARY_WIDTH, "[tag update]", REFCOL_WIDTH, remote,
 209                         pretty_ref);
 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                 const char *msg;
 217                 const char *what;
 218                 if (!strncmp(ref->name, "refs/tags/", 10)) {
 219                         msg = "storing tag";
 220                         what = "[new tag]";
 221                 }
 222                 else {
 223                         msg = "storing head";
 224                         what = "[new branch]";
 225                 }
 226
 227                 sprintf(display, "* %-*s %-*s -> %s", SUMMARY_WIDTH, what,
 228                         REFCOL_WIDTH, remote, pretty_ref);
 229                 return s_update_ref(msg, ref, 0);
 230         }
 231
 232         if (in_merge_bases(current, &updated, 1)) {
 233                 char quickref[83];
 234                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 235                 strcat(quickref, "..");
 236                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 237                 sprintf(display, "  %-*s %-*s -> %s", SUMMARY_WIDTH, quickref,
 238                         REFCOL_WIDTH, remote, pretty_ref);
 239                 return s_update_ref("fast forward", ref, 1);
 240         } else if (force || ref->force) {
 241                 char quickref[84];
 242                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 243                 strcat(quickref, "...");
 244                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 245                 sprintf(display, "+ %-*s %-*s -> %s  (forced update)",
 246                         SUMMARY_WIDTH, quickref, REFCOL_WIDTH, remote, pretty_ref);
 247                 return s_update_ref("forced-update", ref, 1);
 248         } else {
 249                 sprintf(display, "! %-*s %-*s -> %s  (non fast forward)",
 250                         SUMMARY_WIDTH, "[rejected]", REFCOL_WIDTH, remote,
 251                         pretty_ref);
 252                 return 1;
 253         }
 254 }
 255
 256 static void store_updated_refs(const char *url, struct ref *ref_map)
 257 {
 258         FILE *fp;
 259         struct commit *commit;
 260         int url_len, i, note_len, shown_url = 0;
 261         char note[1024];
 262         const char *what, *kind;
 263         struct ref *rm;
 264
 265         fp = fopen(git_path("FETCH_HEAD"), "a");
 266         for (rm = ref_map; rm; rm = rm->next) {
 267                 struct ref *ref = NULL;
 268
 269                 if (rm->peer_ref) {
 270                         ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
 271                         strcpy(ref->name, rm->peer_ref->name);
 272                         hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
 273                         hashcpy(ref->new_sha1, rm->old_sha1);
 274                         ref->force = rm->peer_ref->force;
 275                 }
 276
 277                 commit = lookup_commit_reference_gently(rm->old_sha1, 1);
 278                 if (!commit)
 279                         rm->merge = 0;
 280
 281                 if (!strcmp(rm->name, "HEAD")) {
 282                         kind = "";
 283                         what = "";
 284                 }
 285                 else if (!prefixcmp(rm->name, "refs/heads/")) {
 286                         kind = "branch";
 287                         what = rm->name + 11;
 288                 }
 289                 else if (!prefixcmp(rm->name, "refs/tags/")) {
 290                         kind = "tag";
 291                         what = rm->name + 10;
 292                 }
 293                 else if (!prefixcmp(rm->name, "refs/remotes/")) {
 294                         kind = "remote branch";
 295                         what = rm->name + 13;
 296                 }
 297                 else {
 298                         kind = "";
 299                         what = rm->name;
 300                 }
 301
 302                 url_len = strlen(url);
 303                 for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 304                         ;
 305                 url_len = i + 1;
 306                 if (4 < i && !strncmp(".git", url + i - 3, 4))
 307                         url_len = i - 3;
 308
 309                 note_len = 0;
 310                 if (*what) {
 311                         if (*kind)
 312                                 note_len += sprintf(note + note_len, "%s ",
 313                                                     kind);
 314                         note_len += sprintf(note + note_len, "'%s' of ", what);
 315                 }
 316                 note_len += sprintf(note + note_len, "%.*s", url_len, url);
 317                 fprintf(fp, "%s\t%s\t%s\n",
 318                         sha1_to_hex(commit ? commit->object.sha1 :
 319                                     rm->old_sha1),
 320                         rm->merge ? "" : "not-for-merge",
 321                         note);
 322
 323                 if (ref) {
 324                         update_local_ref(ref, what, verbose, note);
 325                         if (*note) {
 326                                 if (!shown_url) {
 327                                         fprintf(stderr, "From %.*s\n",
 328                                                         url_len, url);
 329                                         shown_url = 1;
 330                                 }
 331                                 fprintf(stderr, " %s\n", note);
 332                         }
 333                 }
 334         }
 335         fclose(fp);
 336 }
 337
 338 static int fetch_refs(struct transport *transport, struct ref *ref_map)
 339 {
 340         int ret = transport_fetch_refs(transport, ref_map);
 341         if (!ret)
 342                 store_updated_refs(transport->url, ref_map);
 343         transport_unlock_pack(transport);
 344         return ret;
 345 }
 346
 347 static int add_existing(const char *refname, const unsigned char *sha1,
 348                         int flag, void *cbdata)
 349 {
 350         struct path_list *list = (struct path_list *)cbdata;
 351         path_list_insert(refname, list);
 352         return 0;
 353 }
 354
 355 static struct ref *find_non_local_tags(struct transport *transport,
 356                                        struct ref *fetch_map)
 357 {
 358         static struct path_list existing_refs = { NULL, 0, 0, 0 };
 359         struct path_list new_refs = { NULL, 0, 0, 1 };
 360         char *ref_name;
 361         int ref_name_len;
 362         unsigned char *ref_sha1;
 363         struct ref *tag_ref;
 364         struct ref *rm = NULL;
 365         struct ref *ref_map = NULL;
 366         struct ref **tail = &ref_map;
 367         struct ref *ref;
 368
 369         for_each_ref(add_existing, &existing_refs);
 370         for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
 371                 if (prefixcmp(ref->name, "refs/tags"))
 372                         continue;
 373
 374                 ref_name = xstrdup(ref->name);
 375                 ref_name_len = strlen(ref_name);
 376                 ref_sha1 = ref->old_sha1;
 377
 378                 if (!strcmp(ref_name + ref_name_len - 3, "^{}")) {
 379                         ref_name[ref_name_len - 3] = 0;
 380                         tag_ref = transport_get_remote_refs(transport);
 381                         while (tag_ref) {
 382                                 if (!strcmp(tag_ref->name, ref_name)) {
 383                                         ref_sha1 = tag_ref->old_sha1;
 384                                         break;
 385                                 }
 386                                 tag_ref = tag_ref->next;
 387                         }
 388                 }
 389
 390                 if (!path_list_has_path(&existing_refs, ref_name) &&
 391                     !path_list_has_path(&new_refs, ref_name) &&
 392                     lookup_object(ref->old_sha1)) {
 393                         path_list_insert(ref_name, &new_refs);
 394
 395                         rm = alloc_ref(strlen(ref_name) + 1);
 396                         strcpy(rm->name, ref_name);
 397                         rm->peer_ref = alloc_ref(strlen(ref_name) + 1);
 398                         strcpy(rm->peer_ref->name, ref_name);
 399                         hashcpy(rm->old_sha1, ref_sha1);
 400
 401                         *tail = rm;
 402                         tail = &rm->next;
 403                 }
 404                 free(ref_name);
 405         }
 406
 407         return ref_map;
 408 }
 409
 410 static int do_fetch(struct transport *transport,
 411                     struct refspec *refs, int ref_count)
 412 {
 413         struct ref *ref_map, *fetch_map;
 414         struct ref *rm;
 415         int autotags = (transport->remote->fetch_tags == 1);
 416         if (transport->remote->fetch_tags == 2 && !no_tags)
 417                 tags = 1;
 418         if (transport->remote->fetch_tags == -1)
 419                 no_tags = 1;
 420
 421         if (!transport->get_refs_list || !transport->fetch)
 422                 die("Don't know how to fetch from %s", transport->url);
 423
 424         /* if not appending, truncate FETCH_HEAD */
 425         if (!append)
 426                 fclose(fopen(git_path("FETCH_HEAD"), "w"));
 427
 428         ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
 429
 430         for (rm = ref_map; rm; rm = rm->next) {
 431                 if (rm->peer_ref)
 432                         read_ref(rm->peer_ref->name, rm->peer_ref->old_sha1);
 433         }
 434
 435         if (fetch_refs(transport, ref_map)) {
 436                 free_refs(ref_map);
 437                 return 1;
 438         }
 439
 440         fetch_map = ref_map;
 441
 442         /* if neither --no-tags nor --tags was specified, do automated tag
 443          * following ... */
 444         if (!(tags || no_tags) && autotags) {
 445                 ref_map = find_non_local_tags(transport, fetch_map);
 446                 if (ref_map) {
 447                         transport_set_option(transport, TRANS_OPT_DEPTH, "0");
 448                         fetch_refs(transport, ref_map);
 449                 }
 450                 free_refs(ref_map);
 451         }
 452
 453         free_refs(fetch_map);
 454
 455         return 0;
 456 }
 457
 458 static void set_option(const char *name, const char *value)
 459 {
 460         int r = transport_set_option(transport, name, value);
 461         if (r < 0)
 462                 die("Option \"%s\" value \"%s\" is not valid for %s\n",
 463                         name, value, transport->url);
 464         if (r > 0)
 465                 warning("Option \"%s\" is ignored for %s\n",
 466                         name, transport->url);
 467 }
 468
 469 int cmd_fetch(int argc, const char **argv, const char *prefix)
 470 {
 471         struct remote *remote;
 472         int i, j, rla_offset;
 473         static const char **refs = NULL;
 474         int ref_nr = 0;
 475         int cmd_len = 0;
 476         const char *depth = NULL, *upload_pack = NULL;
 477         int keep = 0;
 478
 479         for (i = 1; i < argc; i++) {
 480                 const char *arg = argv[i];
 481                 cmd_len += strlen(arg);
 482
 483                 if (arg[0] != '-')
 484                         break;
 485                 if (!strcmp(arg, "--append") || !strcmp(arg, "-a")) {
 486                         append = 1;
 487                         continue;
 488                 }
 489                 if (!prefixcmp(arg, "--upload-pack=")) {
 490                         upload_pack = arg + 14;
 491                         continue;
 492                 }
 493                 if (!strcmp(arg, "--upload-pack")) {
 494                         i++;
 495                         if (i == argc)
 496                                 usage(fetch_usage);
 497                         upload_pack = argv[i];
 498                         continue;
 499                 }
 500                 if (!strcmp(arg, "--force") || !strcmp(arg, "-f")) {
 501                         force = 1;
 502                         continue;
 503                 }
 504                 if (!strcmp(arg, "--no-tags")) {
 505                         no_tags = 1;
 506                         continue;
 507                 }
 508                 if (!strcmp(arg, "--tags") || !strcmp(arg, "-t")) {
 509                         tags = 1;
 510                         continue;
 511                 }
 512                 if (!strcmp(arg, "--keep") || !strcmp(arg, "-k")) {
 513                         keep = 1;
 514                         continue;
 515                 }
 516                 if (!strcmp(arg, "--update-head-ok") || !strcmp(arg, "-u")) {
 517                         update_head_ok = 1;
 518                         continue;
 519                 }
 520                 if (!prefixcmp(arg, "--depth=")) {
 521                         depth = arg + 8;
 522                         continue;
 523                 }
 524                 if (!strcmp(arg, "--depth")) {
 525                         i++;
 526                         if (i == argc)
 527                                 usage(fetch_usage);
 528                         depth = argv[i];
 529                         continue;
 530                 }
 531                 if (!strcmp(arg, "--quiet") || !strcmp(arg, "-q")) {
 532                         quiet = 1;
 533                         continue;
 534                 }
 535                 if (!strcmp(arg, "--verbose") || !strcmp(arg, "-v")) {
 536                         verbose++;
 537                         continue;
 538                 }
 539                 usage(fetch_usage);
 540         }
 541
 542         for (j = i; j < argc; j++)
 543                 cmd_len += strlen(argv[j]);
 544
 545         default_rla = xmalloc(cmd_len + 5 + argc + 1);
 546         sprintf(default_rla, "fetch");
 547         rla_offset = strlen(default_rla);
 548         for (j = 1; j < argc; j++) {
 549                 sprintf(default_rla + rla_offset, " %s", argv[j]);
 550                 rla_offset += strlen(argv[j]) + 1;
 551         }
 552
 553         if (i == argc)
 554                 remote = remote_get(NULL);
 555         else
 556                 remote = remote_get(argv[i++]);
 557
 558         transport = transport_get(remote, remote->url[0]);
 559         if (verbose >= 2)
 560                 transport->verbose = 1;
 561         if (quiet)
 562                 transport->verbose = -1;
 563         if (upload_pack)
 564                 set_option(TRANS_OPT_UPLOADPACK, upload_pack);
 565         if (keep)
 566                 set_option(TRANS_OPT_KEEP, "yes");
 567         if (depth)
 568                 set_option(TRANS_OPT_DEPTH, depth);
 569
 570         if (!transport->url)
 571                 die("Where do you want to fetch from today?");
 572
 573         if (i < argc) {
 574                 int j = 0;
 575                 refs = xcalloc(argc - i + 1, sizeof(const char *));
 576                 while (i < argc) {
 577                         if (!strcmp(argv[i], "tag")) {
 578                                 char *ref;
 579                                 i++;
 580                                 ref = xmalloc(strlen(argv[i]) * 2 + 22);
 581                                 strcpy(ref, "refs/tags/");
 582                                 strcat(ref, argv[i]);
 583                                 strcat(ref, ":refs/tags/");
 584                                 strcat(ref, argv[i]);
 585                                 refs[j++] = ref;
 586                         } else
 587                                 refs[j++] = argv[i];
 588                         i++;
 589                 }
 590                 refs[j] = NULL;
 591                 ref_nr = j;
 592         }
 593
 594         signal(SIGINT, unlock_pack_on_signal);
 595         atexit(unlock_pack);
 596         return do_fetch(transport, parse_ref_spec(ref_nr, refs), ref_nr);
 597 }