builtin-fetch--tool.c

   1 #include "cache.h"
   2 #include "refs.h"
   3 #include "commit.h"
   4
   5 #define CHUNK_SIZE 1024
   6
   7 static char *get_stdin(void)
   8 {
   9         int offset = 0;
  10         char *data = xmalloc(CHUNK_SIZE);
  11
  12         while (1) {
  13                 int cnt = xread(0, data + offset, CHUNK_SIZE);
  14                 if (cnt < 0)
  15                         die("error reading standard input: %s",
  16                             strerror(errno));
  17                 if (cnt == 0) {
  18                         data[offset] = 0;
  19                         break;
  20                 }
  21                 offset += cnt;
  22                 data = xrealloc(data, offset + CHUNK_SIZE);
  23         }
  24         return data;
  25 }
  26
  27 static void show_new(enum object_type type, unsigned char *sha1_new)
  28 {
  29         fprintf(stderr, "  %s: %s\n", typename(type),
  30                 find_unique_abbrev(sha1_new, DEFAULT_ABBREV));
  31 }
  32
  33 static int update_ref(const char *action,
  34                       const char *refname,
  35                       unsigned char *sha1,
  36                       unsigned char *oldval)
  37 {
  38         int len;
  39         char msg[1024];
  40         char *rla = getenv("GIT_REFLOG_ACTION");
  41         static struct ref_lock *lock;
  42
  43         if (!rla)
  44                 rla = "(reflog update)";
  45         len = snprintf(msg, sizeof(msg), "%s: %s", rla, action);
  46         if (sizeof(msg) <= len)
  47                 die("insanely long action");
  48         lock = lock_any_ref_for_update(refname, oldval);
  49         if (!lock)
  50                 return 1;
  51         if (write_ref_sha1(lock, sha1, msg) < 0)
  52                 return 1;
  53         return 0;
  54 }
  55
  56 static int update_local_ref(const char *name,
  57                             const char *new_head,
  58                             const char *note,
  59                             int verbose, int force)
  60 {
  61         unsigned char sha1_old[20], sha1_new[20];
  62         char oldh[41], newh[41];
  63         struct commit *current, *updated;
  64         enum object_type type;
  65
  66         if (get_sha1_hex(new_head, sha1_new))
  67                 die("malformed object name %s", new_head);
  68
  69         type = sha1_object_info(sha1_new, NULL);
  70         if (type < 0)
  71                 die("object %s not found", new_head);
  72
  73         if (!*name) {
  74                 /* Not storing */
  75                 if (verbose) {
  76                         fprintf(stderr, "* fetched %s\n", note);
  77                         show_new(type, sha1_new);
  78                 }
  79                 return 0;
  80         }
  81
  82         if (get_sha1(name, sha1_old)) {
  83                 char *msg;
  84         just_store:
  85                 /* new ref */
  86                 if (!strncmp(name, "refs/tags/", 10))
  87                         msg = "storing tag";
  88                 else
  89                         msg = "storing head";
  90                 fprintf(stderr, "* %s: storing %s\n",
  91                         name, note);
  92                 show_new(type, sha1_new);
  93                 return update_ref(msg, name, sha1_new, NULL);
  94         }
  95
  96         if (!hashcmp(sha1_old, sha1_new)) {
  97                 if (verbose) {
  98                         fprintf(stderr, "* %s: same as %s\n", name, note);
  99                         show_new(type, sha1_new);
 100                 }
 101                 return 0;
 102         }
 103
 104         if (!strncmp(name, "refs/tags/", 10)) {
 105                 fprintf(stderr, "* %s: updating with %s\n", name, note);
 106                 show_new(type, sha1_new);
 107                 return update_ref("updating tag", name, sha1_new, NULL);
 108         }
 109
 110         current = lookup_commit_reference(sha1_old);
 111         updated = lookup_commit_reference(sha1_new);
 112         if (!current || !updated)
 113                 goto just_store;
 114
 115         strcpy(oldh, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 116         strcpy(newh, find_unique_abbrev(sha1_new, DEFAULT_ABBREV));
 117
 118         if (in_merge_bases(current, &updated, 1)) {
 119                 fprintf(stderr, "* %s: fast forward to %s\n",
 120                         name, note);
 121                 fprintf(stderr, "  old..new: %s..%s\n", oldh, newh);
 122                 return update_ref("fast forward", name, sha1_new, sha1_old);
 123         }
 124         if (!force) {
 125                 fprintf(stderr,
 126                         "* %s: not updating to non-fast forward %s\n",
 127                         name, note);
 128                 fprintf(stderr,
 129                         "  old...new: %s...%s\n", oldh, newh);
 130                 return 1;
 131         }
 132         fprintf(stderr,
 133                 "* %s: forcing update to non-fast forward %s\n",
 134                 name, note);
 135         fprintf(stderr, "  old...new: %s...%s\n", oldh, newh);
 136         return update_ref("forced-update", name, sha1_new, sha1_old);
 137 }
 138
 139 static int append_fetch_head(FILE *fp,
 140                              const char *head, const char *remote,
 141                              const char *remote_name, const char *remote_nick,
 142                              const char *local_name, int not_for_merge,
 143                              int verbose, int force)
 144 {
 145         struct commit *commit;
 146         int remote_len, i, note_len;
 147         unsigned char sha1[20];
 148         char note[1024];
 149         const char *what, *kind;
 150
 151         if (get_sha1(head, sha1))
 152                 return error("Not a valid object name: %s", head);
 153         commit = lookup_commit_reference(sha1);
 154         if (!commit)
 155                 not_for_merge = 1;
 156
 157         if (!strcmp(remote_name, "HEAD")) {
 158                 kind = "";
 159                 what = "";
 160         }
 161         else if (!strncmp(remote_name, "refs/heads/", 11)) {
 162                 kind = "branch";
 163                 what = remote_name + 11;
 164         }
 165         else if (!strncmp(remote_name, "refs/tags/", 10)) {
 166                 kind = "tag";
 167                 what = remote_name + 10;
 168         }
 169         else if (!strncmp(remote_name, "refs/remotes/", 13)) {
 170                 kind = "remote branch";
 171                 what = remote_name + 13;
 172         }
 173         else {
 174                 kind = "";
 175                 what = remote_name;
 176         }
 177
 178         remote_len = strlen(remote);
 179         for (i = remote_len - 1; remote[i] == '/' && 0 <= i; i--)
 180                 ;
 181         remote_len = i + 1;
 182         if (4 < i && !strncmp(".git", remote + i - 3, 4))
 183                 remote_len = i - 3;
 184
 185         note_len = 0;
 186         if (*what) {
 187                 if (*kind)
 188                         note_len += sprintf(note + note_len, "%s ", kind);
 189                 note_len += sprintf(note + note_len, "'%s' of ", what);
 190         }
 191         note_len += sprintf(note + note_len, "%.*s", remote_len, remote);
 192         fprintf(fp, "%s\t%s\t%s\n",
 193                 sha1_to_hex(commit ? commit->object.sha1 : sha1),
 194                 not_for_merge ? "not-for-merge" : "",
 195                 note);
 196         return update_local_ref(local_name, head, note, verbose, force);
 197 }
 198
 199 static char *keep;
 200 static void remove_keep(void)
 201 {
 202         if (keep && *keep)
 203                 unlink(keep);
 204 }
 205
 206 static void remove_keep_on_signal(int signo)
 207 {
 208         remove_keep();
 209         signal(SIGINT, SIG_DFL);
 210         raise(signo);
 211 }
 212
 213 static char *find_local_name(const char *remote_name, const char *refs,
 214                              int *force_p, int *not_for_merge_p)
 215 {
 216         const char *ref = refs;
 217         int len = strlen(remote_name);
 218
 219         while (ref) {
 220                 const char *next;
 221                 int single_force, not_for_merge;
 222
 223                 while (*ref == '\n')
 224                         ref++;
 225                 if (!*ref)
 226                         break;
 227                 next = strchr(ref, '\n');
 228
 229                 single_force = not_for_merge = 0;
 230                 if (*ref == '+') {
 231                         single_force = 1;
 232                         ref++;
 233                 }
 234                 if (*ref == '.') {
 235                         not_for_merge = 1;
 236                         ref++;
 237                         if (*ref == '+') {
 238                                 single_force = 1;
 239                                 ref++;
 240                         }
 241                 }
 242                 if (!strncmp(remote_name, ref, len) && ref[len] == ':') {
 243                         const char *local_part = ref + len + 1;
 244                         char *ret;
 245                         int retlen;
 246
 247                         if (!next)
 248                                 retlen = strlen(local_part);
 249                         else
 250                                 retlen = next - local_part;
 251                         ret = xmalloc(retlen + 1);
 252                         memcpy(ret, local_part, retlen);
 253                         ret[retlen] = 0;
 254                         *force_p = single_force;
 255                         *not_for_merge_p = not_for_merge;
 256                         return ret;
 257                 }
 258                 ref = next;
 259         }
 260         return NULL;
 261 }
 262
 263 static int fetch_native_store(FILE *fp,
 264                               const char *remote,
 265                               const char *remote_nick,
 266                               const char *refs,
 267                               int verbose, int force)
 268 {
 269         char buffer[1024];
 270         int err = 0;
 271
 272         signal(SIGINT, remove_keep_on_signal);
 273         atexit(remove_keep);
 274
 275         while (fgets(buffer, sizeof(buffer), stdin)) {
 276                 int len;
 277                 char *cp;
 278                 char *local_name;
 279                 int single_force, not_for_merge;
 280
 281                 for (cp = buffer; *cp && !isspace(*cp); cp++)
 282                         ;
 283                 if (*cp)
 284                         *cp++ = 0;
 285                 len = strlen(cp);
 286                 if (len && cp[len-1] == '\n')
 287                         cp[--len] = 0;
 288                 if (!strcmp(buffer, "failed"))
 289                         die("Fetch failure: %s", remote);
 290                 if (!strcmp(buffer, "pack"))
 291                         continue;
 292                 if (!strcmp(buffer, "keep")) {
 293                         char *od = get_object_directory();
 294                         int len = strlen(od) + strlen(cp) + 50;
 295                         keep = xmalloc(len);
 296                         sprintf(keep, "%s/pack/pack-%s.keep", od, cp);
 297                         continue;
 298                 }
 299
 300                 local_name = find_local_name(cp, refs,
 301                                              &single_force, &not_for_merge);
 302                 if (!local_name)
 303                         continue;
 304                 err |= append_fetch_head(fp,
 305                                          buffer, remote, cp, remote_nick,
 306                                          local_name, not_for_merge,
 307                                          verbose, force || single_force);
 308         }
 309         return err;
 310 }
 311
 312 static int parse_reflist(const char *reflist)
 313 {
 314         const char *ref;
 315
 316         printf("refs='");
 317         for (ref = reflist; ref; ) {
 318                 const char *next;
 319                 while (*ref && isspace(*ref))
 320                         ref++;
 321                 if (!*ref)
 322                         break;
 323                 for (next = ref; *next && !isspace(*next); next++)
 324                         ;
 325                 printf("\n%.*s", (int)(next - ref), ref);
 326                 ref = next;
 327         }
 328         printf("'\n");
 329
 330         printf("rref='");
 331         for (ref = reflist; ref; ) {
 332                 const char *next, *colon;
 333                 while (*ref && isspace(*ref))
 334                         ref++;
 335                 if (!*ref)
 336                         break;
 337                 for (next = ref; *next && !isspace(*next); next++)
 338                         ;
 339                 if (*ref == '.')
 340                         ref++;
 341                 if (*ref == '+')
 342                         ref++;
 343                 colon = strchr(ref, ':');
 344                 putchar('\n');
 345                 printf("%.*s", (int)((colon ? colon : next) - ref), ref);
 346                 ref = next;
 347         }
 348         printf("'\n");
 349         return 0;
 350 }
 351
 352 static int expand_refs_wildcard(const char *ls_remote_result, int numrefs,
 353                                 const char **refs)
 354 {
 355         int i, matchlen, replacelen;
 356         int found_one = 0;
 357         const char *remote = *refs++;
 358         numrefs--;
 359
 360         if (numrefs == 0) {
 361                 fprintf(stderr, "Nothing specified for fetching with remote.%s.fetch\n",
 362                         remote);
 363                 printf("empty\n");
 364         }
 365
 366         for (i = 0; i < numrefs; i++) {
 367                 const char *ref = refs[i];
 368                 const char *lref = ref;
 369                 const char *colon;
 370                 const char *tail;
 371                 const char *ls;
 372                 const char *next;
 373
 374                 if (*lref == '+')
 375                         lref++;
 376                 colon = strchr(lref, ':');
 377                 tail = lref + strlen(lref);
 378                 if (!(colon &&
 379                       2 < colon - lref &&
 380                       colon[-1] == '*' &&
 381                       colon[-2] == '/' &&
 382                       2 < tail - (colon + 1) &&
 383                       tail[-1] == '*' &&
 384                       tail[-2] == '/')) {
 385                         /* not a glob */
 386                         if (!found_one++)
 387                                 printf("explicit\n");
 388                         printf("%s\n", ref);
 389                         continue;
 390                 }
 391
 392                 /* glob */
 393                 if (!found_one++)
 394                         printf("glob\n");
 395
 396                 /* lref to colon-2 is remote hierarchy name;
 397                  * colon+1 to tail-2 is local.
 398                  */
 399                 matchlen = (colon-1) - lref;
 400                 replacelen = (tail-1) - (colon+1);
 401                 for (ls = ls_remote_result; ls; ls = next) {
 402                         const char *eol;
 403                         unsigned char sha1[20];
 404                         int namelen;
 405
 406                         while (*ls && isspace(*ls))
 407                                 ls++;
 408                         next = strchr(ls, '\n');
 409                         eol = !next ? (ls + strlen(ls)) : next;
 410                         if (!memcmp("^{}", eol-3, 3))
 411                                 continue;
 412                         if (eol - ls < 40)
 413                                 continue;
 414                         if (get_sha1_hex(ls, sha1))
 415                                 continue;
 416                         ls += 40;
 417                         while (ls < eol && isspace(*ls))
 418                                 ls++;
 419                         /* ls to next (or eol) is the name.
 420                          * is it identical to lref to colon-2?
 421                          */
 422                         if ((eol - ls) <= matchlen ||
 423                             strncmp(ls, lref, matchlen))
 424                                 continue;
 425
 426                         /* Yes, it is a match */
 427                         namelen = eol - ls;
 428                         if (lref != ref)
 429                                 putchar('+');
 430                         printf("%.*s:%.*s%.*s\n",
 431                                namelen, ls,
 432                                replacelen, colon + 1,
 433                                namelen - matchlen, ls + matchlen);
 434                 }
 435         }
 436         return 0;
 437 }
 438
 439 int cmd_fetch__tool(int argc, const char **argv, const char *prefix)
 440 {
 441         int verbose = 0;
 442         int force = 0;
 443
 444         while (1 < argc) {
 445                 const char *arg = argv[1];
 446                 if (!strcmp("-v", arg))
 447                         verbose = 1;
 448                 else if (!strcmp("-f", arg))
 449                         force = 1;
 450                 else
 451                         break;
 452                 argc--;
 453                 argv++;
 454         }
 455
 456         if (argc <= 1)
 457                 return error("Missing subcommand");
 458
 459         if (!strcmp("append-fetch-head", argv[1])) {
 460                 int result;
 461                 FILE *fp;
 462
 463                 if (argc != 8)
 464                         return error("append-fetch-head takes 6 args");
 465                 fp = fopen(git_path("FETCH_HEAD"), "a");
 466                 result = append_fetch_head(fp, argv[2], argv[3],
 467                                            argv[4], argv[5],
 468                                            argv[6], !!argv[7][0],
 469                                            verbose, force);
 470                 fclose(fp);
 471                 return result;
 472         }
 473         if (!strcmp("native-store", argv[1])) {
 474                 int result;
 475                 FILE *fp;
 476
 477                 if (argc != 5)
 478                         return error("fetch-native-store takes 3 args");
 479                 fp = fopen(git_path("FETCH_HEAD"), "a");
 480                 result = fetch_native_store(fp, argv[2], argv[3], argv[4],
 481                                             verbose, force);
 482                 fclose(fp);
 483                 return result;
 484         }
 485         if (!strcmp("parse-reflist", argv[1])) {
 486                 const char *reflist;
 487                 if (argc != 3)
 488                         return error("parse-reflist takes 1 arg");
 489                 reflist = argv[2];
 490                 if (!strcmp(reflist, "-"))
 491                         reflist = get_stdin();
 492                 return parse_reflist(reflist);
 493         }
 494         if (!strcmp("expand-refs-wildcard", argv[1])) {
 495                 const char *reflist;
 496                 if (argc < 4)
 497                         return error("expand-refs-wildcard takes at least 2 args");
 498                 reflist = argv[2];
 499                 if (!strcmp(reflist, "-"))
 500                         reflist = get_stdin();
 501                 return expand_refs_wildcard(reflist, argc - 3, argv + 3);
 502         }
 503
 504         return error("Unknown subcommand: %s", argv[1]);
 505 }