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