builtin-fetch--tool.c

   1 #include "builtin.h"
   2 #include "cache.h"
   3 #include "refs.h"
   4 #include "commit.h"
   5
   6 #define CHUNK_SIZE 1024
   7
   8 static char *get_stdin(void)
   9 {
  10         size_t offset = 0;
  11         char *data = xmalloc(CHUNK_SIZE);
  12
  13         while (1) {
  14                 ssize_t cnt = xread(0, data + offset, CHUNK_SIZE);
  15                 if (cnt < 0)
  16                         die("error reading standard input: %s",
  17                             strerror(errno));
  18                 if (cnt == 0) {
  19                         data[offset] = 0;
  20                         break;
  21                 }
  22                 offset += cnt;
  23                 data = xrealloc(data, offset + CHUNK_SIZE);
  24         }
  25         return data;
  26 }
  27
  28 static void show_new(enum object_type type, unsigned char *sha1_new)
  29 {
  30         fprintf(stderr, "  %s: %s\n", typename(type),
  31                 find_unique_abbrev(sha1_new, DEFAULT_ABBREV));
  32 }
  33
  34 static int update_ref_env(const char *action,
  35                       const char *refname,
  36                       unsigned char *sha1,
  37                       unsigned char *oldval)
  38 {
  39         char msg[1024];
  40         char *rla = getenv("GIT_REFLOG_ACTION");
  41
  42         if (!rla)
  43                 rla = "(reflog update)";
  44         if (snprintf(msg, sizeof(msg), "%s: %s", rla, action) >= sizeof(msg))
  45                 warning("reflog message too long: %.*s...", 50, msg);
  46         return update_ref(msg, refname, sha1, oldval, 0, QUIET_ON_ERR);
  47 }
  48
  49 static int update_local_ref(const char *name,
  50                             const char *new_head,
  51                             const char *note,
  52                             int verbose, int force)
  53 {
  54         unsigned char sha1_old[20], sha1_new[20];
  55         char oldh[41], newh[41];
  56         struct commit *current, *updated;
  57         enum object_type type;
  58
  59         if (get_sha1_hex(new_head, sha1_new))
  60                 die("malformed object name %s", new_head);
  61
  62         type = sha1_object_info(sha1_new, NULL);
  63         if (type < 0)
  64                 die("object %s not found", new_head);
  65
  66         if (!*name) {
  67                 /* Not storing */
  68                 if (verbose) {
  69                         fprintf(stderr, "* fetched %s\n", note);
  70                         show_new(type, sha1_new);
  71                 }
  72                 return 0;
  73         }
  74
  75         if (get_sha1(name, sha1_old)) {
  76                 char *msg;
  77         just_store:
  78                 /* new ref */
  79                 if (!strncmp(name, "refs/tags/", 10))
  80                         msg = "storing tag";
  81                 else
  82                         msg = "storing head";
  83                 fprintf(stderr, "* %s: storing %s\n",
  84                         name, note);
  85                 show_new(type, sha1_new);
  86                 return update_ref_env(msg, name, sha1_new, NULL);
  87         }
  88
  89         if (!hashcmp(sha1_old, sha1_new)) {
  90                 if (verbose) {
  91                         fprintf(stderr, "* %s: same as %s\n", name, note);
  92                         show_new(type, sha1_new);
  93                 }
  94                 return 0;
  95         }
  96
  97         if (!strncmp(name, "refs/tags/", 10)) {
  98                 fprintf(stderr, "* %s: updating with %s\n", name, note);
  99                 show_new(type, sha1_new);
 100                 return update_ref_env("updating tag", name, sha1_new, NULL);
 101         }
 102
 103         current = lookup_commit_reference(sha1_old);
 104         updated = lookup_commit_reference(sha1_new);
 105         if (!current || !updated)
 106                 goto just_store;
 107
 108         strcpy(oldh, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 109         strcpy(newh, find_unique_abbrev(sha1_new, DEFAULT_ABBREV));
 110
 111         if (in_merge_bases(current, &updated, 1)) {
 112                 fprintf(stderr, "* %s: fast forward to %s\n",
 113                         name, note);
 114                 fprintf(stderr, "  old..new: %s..%s\n", oldh, newh);
 115                 return update_ref_env("fast forward", name, sha1_new, sha1_old);
 116         }
 117         if (!force) {
 118                 fprintf(stderr,
 119                         "* %s: not updating to non-fast forward %s\n",
 120                         name, note);
 121                 fprintf(stderr,
 122                         "  old...new: %s...%s\n", oldh, newh);
 123                 return 1;
 124         }
 125         fprintf(stderr,
 126                 "* %s: forcing update to non-fast forward %s\n",
 127                 name, note);
 128         fprintf(stderr, "  old...new: %s...%s\n", oldh, newh);
 129         return update_ref_env("forced-update", name, sha1_new, sha1_old);
 130 }
 131
 132 static int append_fetch_head(FILE *fp,
 133                              const char *head, const char *remote,
 134                              const char *remote_name, const char *remote_nick,
 135                              const char *local_name, int not_for_merge,
 136                              int verbose, int force)
 137 {
 138         struct commit *commit;
 139         int remote_len, i, note_len;
 140         unsigned char sha1[20];
 141         char note[1024];
 142         const char *what, *kind;
 143
 144         if (get_sha1(head, sha1))
 145                 return error("Not a valid object name: %s", head);
 146         commit = lookup_commit_reference(sha1);
 147         if (!commit)
 148                 not_for_merge = 1;
 149
 150         if (!strcmp(remote_name, "HEAD")) {
 151                 kind = "";
 152                 what = "";
 153         }
 154         else if (!strncmp(remote_name, "refs/heads/", 11)) {
 155                 kind = "branch";
 156                 what = remote_name + 11;
 157         }
 158         else if (!strncmp(remote_name, "refs/tags/", 10)) {
 159                 kind = "tag";
 160                 what = remote_name + 10;
 161         }
 162         else if (!strncmp(remote_name, "refs/remotes/", 13)) {
 163                 kind = "remote branch";
 164                 what = remote_name + 13;
 165         }
 166         else {
 167                 kind = "";
 168                 what = remote_name;
 169         }
 170
 171         remote_len = strlen(remote);
 172         for (i = remote_len - 1; remote[i] == '/' && 0 <= i; i--)
 173                 ;
 174         remote_len = i + 1;
 175         if (4 < i && !strncmp(".git", remote + i - 3, 4))
 176                 remote_len = i - 3;
 177
 178         note_len = 0;
 179         if (*what) {
 180                 if (*kind)
 181                         note_len += sprintf(note + note_len, "%s ", kind);
 182                 note_len += sprintf(note + note_len, "'%s' of ", what);
 183         }
 184         note_len += sprintf(note + note_len, "%.*s", remote_len, remote);
 185         fprintf(fp, "%s\t%s\t%s\n",
 186                 sha1_to_hex(commit ? commit->object.sha1 : sha1),
 187                 not_for_merge ? "not-for-merge" : "",
 188                 note);
 189         return update_local_ref(local_name, head, note, verbose, force);
 190 }
 191
 192 static char *keep;
 193 static void remove_keep(void)
 194 {
 195         if (keep && *keep)
 196                 unlink(keep);
 197 }
 198
 199 static void remove_keep_on_signal(int signo)
 200 {
 201         remove_keep();
 202         signal(SIGINT, SIG_DFL);
 203         raise(signo);
 204 }
 205
 206 static char *find_local_name(const char *remote_name, const char *refs,
 207                              int *force_p, int *not_for_merge_p)
 208 {
 209         const char *ref = refs;
 210         int len = strlen(remote_name);
 211
 212         while (ref) {
 213                 const char *next;
 214                 int single_force, not_for_merge;
 215
 216                 while (*ref == '\n')
 217                         ref++;
 218                 if (!*ref)
 219                         break;
 220                 next = strchr(ref, '\n');
 221
 222                 single_force = not_for_merge = 0;
 223                 if (*ref == '+') {
 224                         single_force = 1;
 225                         ref++;
 226                 }
 227                 if (*ref == '.') {
 228                         not_for_merge = 1;
 229                         ref++;
 230                         if (*ref == '+') {
 231                                 single_force = 1;
 232                                 ref++;
 233                         }
 234                 }
 235                 if (!strncmp(remote_name, ref, len) && ref[len] == ':') {
 236                         const char *local_part = ref + len + 1;
 237                         char *ret;
 238                         int retlen;
 239
 240                         if (!next)
 241                                 retlen = strlen(local_part);
 242                         else
 243                                 retlen = next - local_part;
 244                         ret = xmalloc(retlen + 1);
 245                         memcpy(ret, local_part, retlen);
 246                         ret[retlen] = 0;
 247                         *force_p = single_force;
 248                         *not_for_merge_p = not_for_merge;
 249                         return ret;
 250                 }
 251                 ref = next;
 252         }
 253         return NULL;
 254 }
 255
 256 static int fetch_native_store(FILE *fp,
 257                               const char *remote,
 258                               const char *remote_nick,
 259                               const char *refs,
 260                               int verbose, int force)
 261 {
 262         char buffer[1024];
 263         int err = 0;
 264
 265         signal(SIGINT, remove_keep_on_signal);
 266         atexit(remove_keep);
 267
 268         while (fgets(buffer, sizeof(buffer), stdin)) {
 269                 int len;
 270                 char *cp;
 271                 char *local_name;
 272                 int single_force, not_for_merge;
 273
 274                 for (cp = buffer; *cp && !isspace(*cp); cp++)
 275                         ;
 276                 if (*cp)
 277                         *cp++ = 0;
 278                 len = strlen(cp);
 279                 if (len && cp[len-1] == '\n')
 280                         cp[--len] = 0;
 281                 if (!strcmp(buffer, "failed"))
 282                         die("Fetch failure: %s", remote);
 283                 if (!strcmp(buffer, "pack"))
 284                         continue;
 285                 if (!strcmp(buffer, "keep")) {
 286                         char *od = get_object_directory();
 287                         int len = strlen(od) + strlen(cp) + 50;
 288                         keep = xmalloc(len);
 289                         sprintf(keep, "%s/pack/pack-%s.keep", od, cp);
 290                         continue;
 291                 }
 292
 293                 local_name = find_local_name(cp, refs,
 294                                              &single_force, &not_for_merge);
 295                 if (!local_name)
 296                         continue;
 297                 err |= append_fetch_head(fp,
 298                                          buffer, remote, cp, remote_nick,
 299                                          local_name, not_for_merge,
 300                                          verbose, force || single_force);
 301         }
 302         return err;
 303 }
 304
 305 static int parse_reflist(const char *reflist)
 306 {
 307         const char *ref;
 308
 309         printf("refs='");
 310         for (ref = reflist; ref; ) {
 311                 const char *next;
 312                 while (*ref && isspace(*ref))
 313                         ref++;
 314                 if (!*ref)
 315                         break;
 316                 for (next = ref; *next && !isspace(*next); next++)
 317                         ;
 318                 printf("\n%.*s", (int)(next - ref), ref);
 319                 ref = next;
 320         }
 321         printf("'\n");
 322
 323         printf("rref='");
 324         for (ref = reflist; ref; ) {
 325                 const char *next, *colon;
 326                 while (*ref && isspace(*ref))
 327                         ref++;
 328                 if (!*ref)
 329                         break;
 330                 for (next = ref; *next && !isspace(*next); next++)
 331                         ;
 332                 if (*ref == '.')
 333                         ref++;
 334                 if (*ref == '+')
 335                         ref++;
 336                 colon = strchr(ref, ':');
 337                 putchar('\n');
 338                 printf("%.*s", (int)((colon ? colon : next) - ref), ref);
 339                 ref = next;
 340         }
 341         printf("'\n");
 342         return 0;
 343 }
 344
 345 static int expand_refs_wildcard(const char *ls_remote_result, int numrefs,
 346                                 const char **refs)
 347 {
 348         int i, matchlen, replacelen;
 349         int found_one = 0;
 350         const char *remote = *refs++;
 351         numrefs--;
 352
 353         if (numrefs == 0) {
 354                 fprintf(stderr, "Nothing specified for fetching with remote.%s.fetch\n",
 355                         remote);
 356                 printf("empty\n");
 357         }
 358
 359         for (i = 0; i < numrefs; i++) {
 360                 const char *ref = refs[i];
 361                 const char *lref = ref;
 362                 const char *colon;
 363                 const char *tail;
 364                 const char *ls;
 365                 const char *next;
 366
 367                 if (*lref == '+')
 368                         lref++;
 369                 colon = strchr(lref, ':');
 370                 tail = lref + strlen(lref);
 371                 if (!(colon &&
 372                       2 < colon - lref &&
 373                       colon[-1] == '*' &&
 374                       colon[-2] == '/' &&
 375                       2 < tail - (colon + 1) &&
 376                       tail[-1] == '*' &&
 377                       tail[-2] == '/')) {
 378                         /* not a glob */
 379                         if (!found_one++)
 380                                 printf("explicit\n");
 381                         printf("%s\n", ref);
 382                         continue;
 383                 }
 384
 385                 /* glob */
 386                 if (!found_one++)
 387                         printf("glob\n");
 388
 389                 /* lref to colon-2 is remote hierarchy name;
 390                  * colon+1 to tail-2 is local.
 391                  */
 392                 matchlen = (colon-1) - lref;
 393                 replacelen = (tail-1) - (colon+1);
 394                 for (ls = ls_remote_result; ls; ls = next) {
 395                         const char *eol;
 396                         unsigned char sha1[20];
 397                         int namelen;
 398
 399                         while (*ls && isspace(*ls))
 400                                 ls++;
 401                         next = strchr(ls, '\n');
 402                         eol = !next ? (ls + strlen(ls)) : next;
 403                         if (!memcmp("^{}", eol-3, 3))
 404                                 continue;
 405                         if (eol - ls < 40)
 406                                 continue;
 407                         if (get_sha1_hex(ls, sha1))
 408                                 continue;
 409                         ls += 40;
 410                         while (ls < eol && isspace(*ls))
 411                                 ls++;
 412                         /* ls to next (or eol) is the name.
 413                          * is it identical to lref to colon-2?
 414                          */
 415                         if ((eol - ls) <= matchlen ||
 416                             strncmp(ls, lref, matchlen))
 417                                 continue;
 418
 419                         /* Yes, it is a match */
 420                         namelen = eol - ls;
 421                         if (lref != ref)
 422                                 putchar('+');
 423                         printf("%.*s:%.*s%.*s\n",
 424                                namelen, ls,
 425                                replacelen, colon + 1,
 426                                namelen - matchlen, ls + matchlen);
 427                 }
 428         }
 429         return 0;
 430 }
 431
 432 static int pick_rref(int sha1_only, const char *rref, const char *ls_remote_result)
 433 {
 434         int err = 0;
 435         int lrr_count = lrr_count, i, pass;
 436         const char *cp;
 437         struct lrr {
 438                 const char *line;
 439                 const char *name;
 440                 int namelen;
 441                 int shown;
 442         } *lrr_list = lrr_list;
 443
 444         for (pass = 0; pass < 2; pass++) {
 445                 /* pass 0 counts and allocates, pass 1 fills... */
 446                 cp = ls_remote_result;
 447                 i = 0;
 448                 while (1) {
 449                         const char *np;
 450                         while (*cp && isspace(*cp))
 451                                 cp++;
 452                         if (!*cp)
 453                                 break;
 454                         np = strchr(cp, '\n');
 455                         if (!np)
 456                                 np = cp + strlen(cp);
 457                         if (pass) {
 458                                 lrr_list[i].line = cp;
 459                                 lrr_list[i].name = cp + 41;
 460                                 lrr_list[i].namelen = np - (cp + 41);
 461                         }
 462                         i++;
 463                         cp = np;
 464                 }
 465                 if (!pass) {
 466                         lrr_count = i;
 467                         lrr_list = xcalloc(lrr_count, sizeof(*lrr_list));
 468                 }
 469         }
 470
 471         while (1) {
 472                 const char *next;
 473                 int rreflen;
 474                 int i;
 475
 476                 while (*rref && isspace(*rref))
 477                         rref++;
 478                 if (!*rref)
 479                         break;
 480                 next = strchr(rref, '\n');
 481                 if (!next)
 482                         next = rref + strlen(rref);
 483                 rreflen = next - rref;
 484
 485                 for (i = 0; i < lrr_count; i++) {
 486                         struct lrr *lrr = &(lrr_list[i]);
 487
 488                         if (rreflen == lrr->namelen &&
 489                             !memcmp(lrr->name, rref, rreflen)) {
 490                                 if (!lrr->shown)
 491                                         printf("%.*s\n",
 492                                                sha1_only ? 40 : lrr->namelen + 41,
 493                                                lrr->line);
 494                                 lrr->shown = 1;
 495                                 break;
 496                         }
 497                 }
 498                 if (lrr_count <= i) {
 499                         error("pick-rref: %.*s not found", rreflen, rref);
 500                         err = 1;
 501                 }
 502                 rref = next;
 503         }
 504         free(lrr_list);
 505         return err;
 506 }
 507
 508 int cmd_fetch__tool(int argc, const char **argv, const char *prefix)
 509 {
 510         int verbose = 0;
 511         int force = 0;
 512         int sopt = 0;
 513
 514         while (1 < argc) {
 515                 const char *arg = argv[1];
 516                 if (!strcmp("-v", arg))
 517                         verbose = 1;
 518                 else if (!strcmp("-f", arg))
 519                         force = 1;
 520                 else if (!strcmp("-s", arg))
 521                         sopt = 1;
 522                 else
 523                         break;
 524                 argc--;
 525                 argv++;
 526         }
 527
 528         if (argc <= 1)
 529                 return error("Missing subcommand");
 530
 531         if (!strcmp("append-fetch-head", argv[1])) {
 532                 int result;
 533                 FILE *fp;
 534
 535                 if (argc != 8)
 536                         return error("append-fetch-head takes 6 args");
 537                 fp = fopen(git_path("FETCH_HEAD"), "a");
 538                 result = append_fetch_head(fp, argv[2], argv[3],
 539                                            argv[4], argv[5],
 540                                            argv[6], !!argv[7][0],
 541                                            verbose, force);
 542                 fclose(fp);
 543                 return result;
 544         }
 545         if (!strcmp("native-store", argv[1])) {
 546                 int result;
 547                 FILE *fp;
 548
 549                 if (argc != 5)
 550                         return error("fetch-native-store takes 3 args");
 551                 fp = fopen(git_path("FETCH_HEAD"), "a");
 552                 result = fetch_native_store(fp, argv[2], argv[3], argv[4],
 553                                             verbose, force);
 554                 fclose(fp);
 555                 return result;
 556         }
 557         if (!strcmp("parse-reflist", argv[1])) {
 558                 const char *reflist;
 559                 if (argc != 3)
 560                         return error("parse-reflist takes 1 arg");
 561                 reflist = argv[2];
 562                 if (!strcmp(reflist, "-"))
 563                         reflist = get_stdin();
 564                 return parse_reflist(reflist);
 565         }
 566         if (!strcmp("pick-rref", argv[1])) {
 567                 const char *ls_remote_result;
 568                 if (argc != 4)
 569                         return error("pick-rref takes 2 args");
 570                 ls_remote_result = argv[3];
 571                 if (!strcmp(ls_remote_result, "-"))
 572                         ls_remote_result = get_stdin();
 573                 return pick_rref(sopt, argv[2], ls_remote_result);
 574         }
 575         if (!strcmp("expand-refs-wildcard", argv[1])) {
 576                 const char *reflist;
 577                 if (argc < 4)
 578                         return error("expand-refs-wildcard takes at least 2 args");
 579                 reflist = argv[2];
 580                 if (!strcmp(reflist, "-"))
 581                         reflist = get_stdin();
 582                 return expand_refs_wildcard(reflist, argc - 3, argv + 3);
 583         }
 584
 585         return error("Unknown subcommand: %s", argv[1]);
 586 }