builtin-fetch--tool.c

   1 #include "cache.h"
   2 #include "refs.h"
   3 #include "commit.h"
   4
   5 #define CHUNK_SIZE (1048576)
   6
   7 static char *get_stdin(void)
   8 {
   9         char *data = xmalloc(CHUNK_SIZE);
  10         int offset = 0, read = 0;
  11         read = xread(0, data, CHUNK_SIZE);
  12         while (read == CHUNK_SIZE) {
  13                 offset += CHUNK_SIZE;
  14                 data = xrealloc(data, offset + CHUNK_SIZE);
  15                 read = xread(0, data + offset, CHUNK_SIZE);
  16         }
  17         return data;
  18 }
  19
  20 static void show_new(char *type, unsigned char *sha1_new)
  21 {
  22         fprintf(stderr, "  %s: %s\n", type,
  23                 find_unique_abbrev(sha1_new, DEFAULT_ABBREV));
  24 }
  25
  26 static int update_ref(const char *action,
  27                       const char *refname,
  28                       unsigned char *sha1,
  29                       unsigned char *oldval)
  30 {
  31         int len;
  32         char msg[1024];
  33         char *rla = getenv("GIT_REFLOG_ACTION");
  34         static struct ref_lock *lock;
  35
  36         if (!rla)
  37                 rla = "(reflog update)";
  38         len = snprintf(msg, sizeof(msg), "%s: %s", rla, action);
  39         if (sizeof(msg) <= len)
  40                 die("insanely long action");
  41         lock = lock_any_ref_for_update(refname, oldval);
  42         if (!lock)
  43                 return 1;
  44         if (write_ref_sha1(lock, sha1, msg) < 0)
  45                 return 1;
  46         return 0;
  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         char type[20];
  55         unsigned char sha1_old[20], sha1_new[20];
  56         char oldh[41], newh[41];
  57         struct commit *current, *updated;
  58
  59         if (get_sha1_hex(new_head, sha1_new))
  60                 die("malformed object name %s", new_head);
  61         if (sha1_object_info(sha1_new, type, NULL))
  62                 die("object %s not found", new_head);
  63
  64         if (!*name) {
  65                 /* Not storing */
  66                 if (verbose) {
  67                         fprintf(stderr, "* fetched %s\n", note);
  68                         show_new(type, sha1_new);
  69                 }
  70                 return 0;
  71         }
  72
  73         if (get_sha1(name, sha1_old)) {
  74                 char *msg;
  75         just_store:
  76                 /* new ref */
  77                 if (!strncmp(name, "refs/tags/", 10))
  78                         msg = "storing tag";
  79                 else
  80                         msg = "storing head";
  81                 fprintf(stderr, "* %s: storing %s\n",
  82                         name, note);
  83                 show_new(type, sha1_new);
  84                 return update_ref(msg, name, sha1_new, NULL);
  85         }
  86
  87         if (!hashcmp(sha1_old, sha1_new)) {
  88                 if (verbose) {
  89                         fprintf(stderr, "* %s: same as %s\n", name, note);
  90                         show_new(type, sha1_new);
  91                 }
  92                 return 0;
  93         }
  94
  95         if (!strncmp(name, "refs/tags/", 10)) {
  96                 fprintf(stderr, "* %s: updating with %s\n", name, note);
  97                 show_new(type, sha1_new);
  98                 return update_ref("updating tag", name, sha1_new, NULL);
  99         }
 100
 101         current = lookup_commit_reference(sha1_old);
 102         updated = lookup_commit_reference(sha1_new);
 103         if (!current || !updated)
 104                 goto just_store;
 105
 106         strcpy(oldh, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 107         strcpy(newh, find_unique_abbrev(sha1_new, DEFAULT_ABBREV));
 108
 109         if (in_merge_bases(current, &updated, 1)) {
 110                 fprintf(stderr, "* %s: fast forward to %s\n",
 111                         name, note);
 112                 fprintf(stderr, "  old..new: %s..%s\n", oldh, newh);
 113                 return update_ref("fast forward", name, sha1_new, sha1_old);
 114         }
 115         if (!force) {
 116                 fprintf(stderr,
 117                         "* %s: not updating to non-fast forward %s\n",
 118                         name, note);
 119                 fprintf(stderr,
 120                         "  old...new: %s...%s\n", oldh, newh);
 121                 return 1;
 122         }
 123         fprintf(stderr,
 124                 "* %s: forcing update to non-fast forward %s\n",
 125                 name, note);
 126         fprintf(stderr, "  old...new: %s...%s\n", oldh, newh);
 127         return update_ref("forced-update", name, sha1_new, sha1_old);
 128 }
 129
 130 static int append_fetch_head(FILE *fp,
 131                              const char *head, const char *remote,
 132                              const char *remote_name, const char *remote_nick,
 133                              const char *local_name, int not_for_merge,
 134                              int verbose, int force)
 135 {
 136         struct commit *commit;
 137         int remote_len, i, note_len;
 138         unsigned char sha1[20];
 139         char note[1024];
 140         const char *what, *kind;
 141
 142         if (get_sha1(head, sha1))
 143                 return error("Not a valid object name: %s", head);
 144         commit = lookup_commit_reference(sha1);
 145         if (!commit)
 146                 not_for_merge = 1;
 147
 148         if (!strcmp(remote_name, "HEAD")) {
 149                 kind = "";
 150                 what = "";
 151         }
 152         else if (!strncmp(remote_name, "refs/heads/", 11)) {
 153                 kind = "branch";
 154                 what = remote_name + 11;
 155         }
 156         else if (!strncmp(remote_name, "refs/tags/", 10)) {
 157                 kind = "tag";
 158                 what = remote_name + 10;
 159         }
 160         else if (!strncmp(remote_name, "refs/remotes/", 13)) {
 161                 kind = "remote branch";
 162                 what = remote_name + 13;
 163         }
 164         else {
 165                 kind = "";
 166                 what = remote_name;
 167         }
 168
 169         remote_len = strlen(remote);
 170         for (i = remote_len - 1; remote[i] == '/' && 0 <= i; i--)
 171                 ;
 172         remote_len = i + 1;
 173         if (4 < i && !strncmp(".git", remote + i - 3, 4))
 174                 remote_len = i - 3;
 175         note_len = sprintf(note, "%s\t%s\t",
 176                            sha1_to_hex(commit ? commit->object.sha1 : sha1),
 177                            not_for_merge ? "not-for-merge" : "");
 178         if (*what) {
 179                 if (*kind)
 180                         note_len += sprintf(note + note_len, "%s ", kind);
 181                 note_len += sprintf(note + note_len, "'%s' of ", what);
 182         }
 183         note_len += sprintf(note + note_len, "%.*s", remote_len, remote);
 184         fprintf(fp, "%s\n", note);
 185         return update_local_ref(local_name, head, note, verbose, force);
 186 }
 187
 188 static char *keep;
 189 static void remove_keep(void)
 190 {
 191         if (keep && *keep)
 192                 unlink(keep);
 193 }
 194
 195 static void remove_keep_on_signal(int signo)
 196 {
 197         remove_keep();
 198         signal(SIGINT, SIG_DFL);
 199         raise(signo);
 200 }
 201
 202 static char *find_local_name(const char *remote_name, const char *refs,
 203                              int *force_p, int *not_for_merge_p)
 204 {
 205         const char *ref = refs;
 206         int len = strlen(remote_name);
 207
 208         while (ref) {
 209                 const char *next;
 210                 int single_force, not_for_merge;
 211
 212                 while (*ref == '\n')
 213                         ref++;
 214                 if (!*ref)
 215                         break;
 216                 next = strchr(ref, '\n');
 217
 218                 single_force = not_for_merge = 0;
 219                 if (*ref == '+') {
 220                         single_force = 1;
 221                         ref++;
 222                 }
 223                 if (*ref == '.') {
 224                         not_for_merge = 1;
 225                         ref++;
 226                         if (*ref == '+') {
 227                                 single_force = 1;
 228                                 ref++;
 229                         }
 230                 }
 231                 if (!strncmp(remote_name, ref, len) && ref[len] == ':') {
 232                         const char *local_part = ref + len + 1;
 233                         char *ret;
 234                         int retlen;
 235
 236                         if (!next)
 237                                 retlen = strlen(local_part);
 238                         else
 239                                 retlen = next - local_part;
 240                         ret = xmalloc(retlen + 1);
 241                         memcpy(ret, local_part, retlen);
 242                         ret[retlen] = 0;
 243                         *force_p = single_force;
 244                         *not_for_merge_p = not_for_merge;
 245                         return ret;
 246                 }
 247                 ref = next;
 248         }
 249         return NULL;
 250 }
 251
 252 static int fetch_native_store(FILE *fp,
 253                               const char *remote,
 254                               const char *remote_nick,
 255                               const char *refs,
 256                               int verbose, int force)
 257 {
 258         char buffer[1024];
 259         int err = 0;
 260
 261         signal(SIGINT, remove_keep_on_signal);
 262         atexit(remove_keep);
 263
 264         while (fgets(buffer, sizeof(buffer), stdin)) {
 265                 int len;
 266                 char *cp;
 267                 char *local_name;
 268                 int single_force, not_for_merge;
 269
 270                 for (cp = buffer; *cp && !isspace(*cp); cp++)
 271                         ;
 272                 if (*cp)
 273                         *cp++ = 0;
 274                 len = strlen(cp);
 275                 if (len && cp[len-1] == '\n')
 276                         cp[--len] = 0;
 277                 if (!strcmp(buffer, "failed"))
 278                         die("Fetch failure: %s", remote);
 279                 if (!strcmp(buffer, "pack"))
 280                         continue;
 281                 if (!strcmp(buffer, "keep")) {
 282                         char *od = get_object_directory();
 283                         int len = strlen(od) + strlen(cp) + 50;
 284                         keep = xmalloc(len);
 285                         sprintf(keep, "%s/pack/pack-%s.keep", od, cp);
 286                         continue;
 287                 }
 288
 289                 local_name = find_local_name(cp, refs,
 290                                              &single_force, &not_for_merge);
 291                 if (!local_name)
 292                         continue;
 293                 err |= append_fetch_head(fp,
 294                                          buffer, remote, cp, remote_nick,
 295                                          local_name, not_for_merge,
 296                                          verbose, force || single_force);
 297         }
 298         return err;
 299 }
 300
 301 static int parse_reflist(const char *reflist)
 302 {
 303         const char *ref;
 304
 305         printf("refs='");
 306         for (ref = reflist; ref; ) {
 307                 const char *next;
 308                 while (*ref && isspace(*ref))
 309                         ref++;
 310                 if (!*ref)
 311                         break;
 312                 for (next = ref; *next && !isspace(*next); next++)
 313                         ;
 314                 printf("\n%.*s", (int)(next - ref), ref);
 315                 ref = next;
 316         }
 317         printf("'\n");
 318
 319         printf("rref='");
 320         for (ref = reflist; ref; ) {
 321                 const char *next, *colon;
 322                 while (*ref && isspace(*ref))
 323                         ref++;
 324                 if (!*ref)
 325                         break;
 326                 for (next = ref; *next && !isspace(*next); next++)
 327                         ;
 328                 if (*ref == '.')
 329                         ref++;
 330                 if (*ref == '+')
 331                         ref++;
 332                 colon = strchr(ref, ':');
 333                 putchar('\n');
 334                 printf("%.*s", (int)((colon ? colon : next) - ref), ref);
 335                 ref = next;
 336         }
 337         printf("'\n");
 338         return 0;
 339 }
 340
 341 static int expand_refs_wildcard(const char *ls_remote_result, int numrefs,
 342                                 const char **refs)
 343 {
 344         int i, matchlen, replacelen;
 345         int found_one = 0;
 346         const char *remote = *refs++;
 347         numrefs--;
 348
 349         if (numrefs == 0) {
 350                 fprintf(stderr, "Nothing specified for fetching with remote.%s.fetch\n",
 351                         remote);
 352                 printf("empty\n");
 353         }
 354
 355         for (i = 0; i < numrefs; i++) {
 356                 const char *ref = refs[i];
 357                 const char *lref = ref;
 358                 const char *colon;
 359                 const char *tail;
 360                 const char *ls;
 361                 const char *next;
 362
 363                 if (*lref == '+')
 364                         lref++;
 365                 colon = strchr(lref, ':');
 366                 tail = lref + strlen(lref);
 367                 if (!(colon &&
 368                       2 < colon - lref &&
 369                       colon[-1] == '*' &&
 370                       colon[-2] == '/' &&
 371                       2 < tail - (colon + 1) &&
 372                       tail[-1] == '*' &&
 373                       tail[-2] == '/')) {
 374                         /* not a glob */
 375                         if (!found_one++)
 376                                 printf("explicit\n");
 377                         printf("%s\n", ref);
 378                         continue;
 379                 }
 380
 381                 /* glob */
 382                 if (!found_one++)
 383                         printf("glob\n");
 384
 385                 /* lref to colon-2 is remote hierarchy name;
 386                  * colon+1 to tail-2 is local.
 387                  */
 388                 matchlen = (colon-1) - lref;
 389                 replacelen = (tail-1) - (colon+1);
 390                 for (ls = ls_remote_result; ls; ls = next) {
 391                         const char *eol;
 392                         unsigned char sha1[20];
 393                         int namelen;
 394
 395                         while (*ls && isspace(*ls))
 396                                 ls++;
 397                         next = strchr(ls, '\n');
 398                         eol = !next ? (ls + strlen(ls)) : next;
 399                         if (!memcmp("^{}", eol-3, 3))
 400                                 continue;
 401                         if (get_sha1_hex(ls, sha1))
 402                                 continue;
 403                         ls += 40;
 404                         while (ls < eol && isspace(*ls))
 405                                 ls++;
 406                         /* ls to next (or eol) is the name.
 407                          * is it identical to lref to colon-2?
 408                          */
 409                         if ((eol - ls) <= matchlen ||
 410                             strncmp(ls, lref, matchlen))
 411                                 continue;
 412
 413                         /* Yes, it is a match */
 414                         namelen = eol - ls;
 415                         if (lref != ref)
 416                                 putchar('+');
 417                         printf("%.*s:%.*s%.*s\n",
 418                                namelen, ls,
 419                                replacelen, colon + 1,
 420                                namelen - matchlen, ls + matchlen);
 421                 }
 422         }
 423         return 0;
 424 }
 425
 426 int cmd_fetch__tool(int argc, const char **argv, const char *prefix)
 427 {
 428         int verbose = 0;
 429         int force = 0;
 430
 431         while (1 < argc) {
 432                 const char *arg = argv[1];
 433                 if (!strcmp("-v", arg))
 434                         verbose = 1;
 435                 else if (!strcmp("-f", arg))
 436                         force = 1;
 437                 else
 438                         break;
 439                 argc--;
 440                 argv++;
 441         }
 442
 443         if (argc <= 1)
 444                 return error("Missing subcommand");
 445
 446         if (!strcmp("append-fetch-head", argv[1])) {
 447                 int result;
 448                 FILE *fp;
 449
 450                 if (argc != 8)
 451                         return error("append-fetch-head takes 6 args");
 452                 fp = fopen(git_path("FETCH_HEAD"), "a");
 453                 result = append_fetch_head(fp, argv[2], argv[3],
 454                                            argv[4], argv[5],
 455                                            argv[6], !!argv[7][0],
 456                                            verbose, force);
 457                 fclose(fp);
 458                 return result;
 459         }
 460         if (!strcmp("update-local-ref", argv[1])) {
 461                 if (argc != 5)
 462                         return error("update-local-ref takes 3 args");
 463                 return update_local_ref(argv[2], argv[3], argv[4],
 464                                         verbose, force);
 465         }
 466         if (!strcmp("native-store", argv[1])) {
 467                 int result;
 468                 FILE *fp;
 469
 470                 if (argc != 5)
 471                         return error("fetch-native-store takes 3 args");
 472                 fp = fopen(git_path("FETCH_HEAD"), "a");
 473                 result = fetch_native_store(fp, argv[2], argv[3], argv[4],
 474                                             verbose, force);
 475                 fclose(fp);
 476                 return result;
 477         }
 478         if (!strcmp("parse-reflist", argv[1])) {
 479                 const char *reflist;
 480                 if (argc != 3)
 481                         return error("parse-reflist takes 1 arg");
 482                 reflist = argv[2];
 483                 if (!strcmp(reflist, "-"))
 484                         reflist = get_stdin();
 485                 return parse_reflist(reflist);
 486         }
 487         if (!strcmp("expand-refs-wildcard", argv[1])) {
 488                 const char *reflist;
 489                 if (argc < 4)
 490                         return error("expand-refs-wildcard takes at least 2 args");
 491                 reflist = argv[2];
 492                 if (!strcmp(reflist, "-"))
 493                         reflist = get_stdin();
 494                 return expand_refs_wildcard(reflist, argc - 3, argv + 3);
 495         }
 496
 497         return error("Unknown subcommand: %s", argv[1]);
 498 }