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                            const 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         const 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
 156 static int update_local_ref(struct ref *ref,
 157                             const char *remote,
 158                             int verbose,
 159                             char *display)
 160 {
 161         struct commit *current = NULL, *updated;
 162         enum object_type type;
 163         struct branch *current_branch = branch_get(NULL);
 164         const char *pretty_ref = ref->name + (
 165                 !prefixcmp(ref->name, "refs/heads/") ? 11 :
 166                 !prefixcmp(ref->name, "refs/tags/") ? 10 :
 167                 !prefixcmp(ref->name, "refs/remotes/") ? 13 :
 168                 0);
 169
 170         *display = 0;
 171         type = sha1_object_info(ref->new_sha1, NULL);
 172         if (type < 0)
 173                 die("object %s not found", sha1_to_hex(ref->new_sha1));
 174
 175         if (!*ref->name) {
 176                 /* Not storing */
 177                 if (verbose)
 178                         sprintf(display, "* branch %s -> FETCH_HEAD", remote);
 179                 return 0;
 180         }
 181
 182         if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
 183                 if (verbose)
 184                         sprintf(display, "= %-*s %s -> %s", SUMMARY_WIDTH,
 185                                 "[up to date]", remote, pretty_ref);
 186                 return 0;
 187         }
 188
 189         if (current_branch &&
 190             !strcmp(ref->name, current_branch->name) &&
 191             !(update_head_ok || is_bare_repository()) &&
 192             !is_null_sha1(ref->old_sha1)) {
 193                 /*
 194                  * If this is the head, and it's not okay to update
 195                  * the head, and the old value of the head isn't empty...
 196                  */
 197                 sprintf(display, "! %-*s %s -> %s  (can't  fetch in current branch)",
 198                         SUMMARY_WIDTH, "[rejected]", remote, pretty_ref);
 199                 return 1;
 200         }
 201
 202         if (!is_null_sha1(ref->old_sha1) &&
 203             !prefixcmp(ref->name, "refs/tags/")) {
 204                 sprintf(display, "- %-*s %s -> %s",
 205                         SUMMARY_WIDTH, "[tag update]", remote, pretty_ref);
 206                 return s_update_ref("updating tag", ref, 0);
 207         }
 208
 209         current = lookup_commit_reference_gently(ref->old_sha1, 1);
 210         updated = lookup_commit_reference_gently(ref->new_sha1, 1);
 211         if (!current || !updated) {
 212                 const char *msg;
 213                 const char *what;
 214                 if (!strncmp(ref->name, "refs/tags/", 10)) {
 215                         msg = "storing tag";
 216                         what = "[new tag]";
 217                 }
 218                 else {
 219                         msg = "storing head";
 220                         what = "[new branch]";
 221                 }
 222
 223                 sprintf(display, "* %-*s %s -> %s",
 224                         SUMMARY_WIDTH, what, remote, pretty_ref);
 225                 return s_update_ref(msg, ref, 0);
 226         }
 227
 228         if (in_merge_bases(current, &updated, 1)) {
 229                 char quickref[83];
 230                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 231                 strcat(quickref, "..");
 232                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 233                 sprintf(display, "  %-*s %s -> %s  (fast forward)",
 234                         SUMMARY_WIDTH, quickref, remote, pretty_ref);
 235                 return s_update_ref("fast forward", ref, 1);
 236         } else if (force || ref->force) {
 237                 char quickref[84];
 238                 strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 239                 strcat(quickref, "...");
 240                 strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 241                 sprintf(display, "+ %-*s %s -> %s  (forced update)",
 242                         SUMMARY_WIDTH, quickref, remote, pretty_ref);
 243                 return s_update_ref("forced-update", ref, 1);
 244         } else {
 245                 sprintf(display, "! %-*s %s -> %s  (non fast forward)",
 246                         SUMMARY_WIDTH, "[rejected]", remote, pretty_ref);
 247                 return 1;
 248         }
 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, shown_url = 0;
 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, what, verbose, note);
 320                         if (*note) {
 321                                 if (!shown_url) {
 322                                         fprintf(stderr, "From %.*s\n",
 323                                                         url_len, url);
 324                                         shown_url = 1;
 325                                 }
 326                                 fprintf(stderr, " %s\n", note);
 327                         }
 328                 }
 329         }
 330         fclose(fp);
 331 }
 332
 333 static int fetch_refs(struct transport *transport, struct ref *ref_map)
 334 {
 335         int ret = transport_fetch_refs(transport, ref_map);
 336         if (!ret)
 337                 store_updated_refs(transport->url, ref_map);
 338         transport_unlock_pack(transport);
 339         return ret;
 340 }
 341
 342 static int add_existing(const char *refname, const unsigned char *sha1,
 343                         int flag, void *cbdata)
 344 {
 345         struct path_list *list = (struct path_list *)cbdata;
 346         path_list_insert(refname, list);
 347         return 0;
 348 }
 349
 350 static struct ref *find_non_local_tags(struct transport *transport,
 351                                        struct ref *fetch_map)
 352 {
 353         static struct path_list existing_refs = { NULL, 0, 0, 0 };
 354         struct path_list new_refs = { NULL, 0, 0, 1 };
 355         char *ref_name;
 356         int ref_name_len;
 357         const unsigned char *ref_sha1;
 358         const struct ref *tag_ref;
 359         struct ref *rm = NULL;
 360         struct ref *ref_map = NULL;
 361         struct ref **tail = &ref_map;
 362         const struct ref *ref;
 363
 364         for_each_ref(add_existing, &existing_refs);
 365         for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
 366                 if (prefixcmp(ref->name, "refs/tags"))
 367                         continue;
 368
 369                 ref_name = xstrdup(ref->name);
 370                 ref_name_len = strlen(ref_name);
 371                 ref_sha1 = ref->old_sha1;
 372
 373                 if (!strcmp(ref_name + ref_name_len - 3, "^{}")) {
 374                         ref_name[ref_name_len - 3] = 0;
 375                         tag_ref = transport_get_remote_refs(transport);
 376                         while (tag_ref) {
 377                                 if (!strcmp(tag_ref->name, ref_name)) {
 378                                         ref_sha1 = tag_ref->old_sha1;
 379                                         break;
 380                                 }
 381                                 tag_ref = tag_ref->next;
 382                         }
 383                 }
 384
 385                 if (!path_list_has_path(&existing_refs, ref_name) &&
 386                     !path_list_has_path(&new_refs, ref_name) &&
 387                     lookup_object(ref->old_sha1)) {
 388                         path_list_insert(ref_name, &new_refs);
 389
 390                         rm = alloc_ref(strlen(ref_name) + 1);
 391                         strcpy(rm->name, ref_name);
 392                         rm->peer_ref = alloc_ref(strlen(ref_name) + 1);
 393                         strcpy(rm->peer_ref->name, ref_name);
 394                         hashcpy(rm->old_sha1, ref_sha1);
 395
 396                         *tail = rm;
 397                         tail = &rm->next;
 398                 }
 399                 free(ref_name);
 400         }
 401
 402         return ref_map;
 403 }
 404
 405 static int do_fetch(struct transport *transport,
 406                     struct refspec *refs, int ref_count)
 407 {
 408         struct ref *ref_map, *fetch_map;
 409         struct ref *rm;
 410         int autotags = (transport->remote->fetch_tags == 1);
 411         if (transport->remote->fetch_tags == 2 && !no_tags)
 412                 tags = 1;
 413         if (transport->remote->fetch_tags == -1)
 414                 no_tags = 1;
 415
 416         if (!transport->get_refs_list || !transport->fetch)
 417                 die("Don't know how to fetch from %s", transport->url);
 418
 419         /* if not appending, truncate FETCH_HEAD */
 420         if (!append)
 421                 fclose(fopen(git_path("FETCH_HEAD"), "w"));
 422
 423         ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
 424
 425         for (rm = ref_map; rm; rm = rm->next) {
 426                 if (rm->peer_ref)
 427                         read_ref(rm->peer_ref->name, rm->peer_ref->old_sha1);
 428         }
 429
 430         if (fetch_refs(transport, ref_map)) {
 431                 free_refs(ref_map);
 432                 return 1;
 433         }
 434
 435         fetch_map = ref_map;
 436
 437         /* if neither --no-tags nor --tags was specified, do automated tag
 438          * following ... */
 439         if (!(tags || no_tags) && autotags) {
 440                 ref_map = find_non_local_tags(transport, fetch_map);
 441                 if (ref_map) {
 442                         transport_set_option(transport, TRANS_OPT_DEPTH, "0");
 443                         fetch_refs(transport, ref_map);
 444                 }
 445                 free_refs(ref_map);
 446         }
 447
 448         free_refs(fetch_map);
 449
 450         return 0;
 451 }
 452
 453 static void set_option(const char *name, const char *value)
 454 {
 455         int r = transport_set_option(transport, name, value);
 456         if (r < 0)
 457                 die("Option \"%s\" value \"%s\" is not valid for %s\n",
 458                         name, value, transport->url);
 459         if (r > 0)
 460                 warning("Option \"%s\" is ignored for %s\n",
 461                         name, transport->url);
 462 }
 463
 464 int cmd_fetch(int argc, const char **argv, const char *prefix)
 465 {
 466         struct remote *remote;
 467         int i, j, rla_offset;
 468         static const char **refs = NULL;
 469         int ref_nr = 0;
 470         int cmd_len = 0;
 471         const char *depth = NULL, *upload_pack = NULL;
 472         int keep = 0;
 473
 474         for (i = 1; i < argc; i++) {
 475                 const char *arg = argv[i];
 476                 cmd_len += strlen(arg);
 477
 478                 if (arg[0] != '-')
 479                         break;
 480                 if (!strcmp(arg, "--append") || !strcmp(arg, "-a")) {
 481                         append = 1;
 482                         continue;
 483                 }
 484                 if (!prefixcmp(arg, "--upload-pack=")) {
 485                         upload_pack = arg + 14;
 486                         continue;
 487                 }
 488                 if (!strcmp(arg, "--upload-pack")) {
 489                         i++;
 490                         if (i == argc)
 491                                 usage(fetch_usage);
 492                         upload_pack = argv[i];
 493                         continue;
 494                 }
 495                 if (!strcmp(arg, "--force") || !strcmp(arg, "-f")) {
 496                         force = 1;
 497                         continue;
 498                 }
 499                 if (!strcmp(arg, "--no-tags")) {
 500                         no_tags = 1;
 501                         continue;
 502                 }
 503                 if (!strcmp(arg, "--tags") || !strcmp(arg, "-t")) {
 504                         tags = 1;
 505                         continue;
 506                 }
 507                 if (!strcmp(arg, "--keep") || !strcmp(arg, "-k")) {
 508                         keep = 1;
 509                         continue;
 510                 }
 511                 if (!strcmp(arg, "--update-head-ok") || !strcmp(arg, "-u")) {
 512                         update_head_ok = 1;
 513                         continue;
 514                 }
 515                 if (!prefixcmp(arg, "--depth=")) {
 516                         depth = arg + 8;
 517                         continue;
 518                 }
 519                 if (!strcmp(arg, "--depth")) {
 520                         i++;
 521                         if (i == argc)
 522                                 usage(fetch_usage);
 523                         depth = argv[i];
 524                         continue;
 525                 }
 526                 if (!strcmp(arg, "--quiet") || !strcmp(arg, "-q")) {
 527                         quiet = 1;
 528                         continue;
 529                 }
 530                 if (!strcmp(arg, "--verbose") || !strcmp(arg, "-v")) {
 531                         verbose++;
 532                         continue;
 533                 }
 534                 usage(fetch_usage);
 535         }
 536
 537         for (j = i; j < argc; j++)
 538                 cmd_len += strlen(argv[j]);
 539
 540         default_rla = xmalloc(cmd_len + 5 + argc + 1);
 541         sprintf(default_rla, "fetch");
 542         rla_offset = strlen(default_rla);
 543         for (j = 1; j < argc; j++) {
 544                 sprintf(default_rla + rla_offset, " %s", argv[j]);
 545                 rla_offset += strlen(argv[j]) + 1;
 546         }
 547
 548         if (i == argc)
 549                 remote = remote_get(NULL);
 550         else
 551                 remote = remote_get(argv[i++]);
 552
 553         transport = transport_get(remote, remote->url[0]);
 554         if (verbose >= 2)
 555                 transport->verbose = 1;
 556         if (quiet)
 557                 transport->verbose = -1;
 558         if (upload_pack)
 559                 set_option(TRANS_OPT_UPLOADPACK, upload_pack);
 560         if (keep)
 561                 set_option(TRANS_OPT_KEEP, "yes");
 562         if (depth)
 563                 set_option(TRANS_OPT_DEPTH, depth);
 564
 565         if (!transport->url)
 566                 die("Where do you want to fetch from today?");
 567
 568         if (i < argc) {
 569                 int j = 0;
 570                 refs = xcalloc(argc - i + 1, sizeof(const char *));
 571                 while (i < argc) {
 572                         if (!strcmp(argv[i], "tag")) {
 573                                 char *ref;
 574                                 i++;
 575                                 ref = xmalloc(strlen(argv[i]) * 2 + 22);
 576                                 strcpy(ref, "refs/tags/");
 577                                 strcat(ref, argv[i]);
 578                                 strcat(ref, ":refs/tags/");
 579                                 strcat(ref, argv[i]);
 580                                 refs[j++] = ref;
 581                         } else
 582                                 refs[j++] = argv[i];
 583                         i++;
 584                 }
 585                 refs[j] = NULL;
 586                 ref_nr = j;
 587         }
 588
 589         signal(SIGINT, unlock_pack_on_signal);
 590         atexit(unlock_pack);
 591         return do_fetch(transport, parse_ref_spec(ref_nr, refs), ref_nr);
 592 }