contrib/examples/builtin-fetch--tool.c

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