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         note_len = sprintf(note, "%s\t%s\t",
 185                            sha1_to_hex(commit ? commit->object.sha1 : sha1),
 186                            not_for_merge ? "not-for-merge" : "");
 187         if (*what) {
 188                 if (*kind)
 189                         note_len += sprintf(note + note_len, "%s ", kind);
 190                 note_len += sprintf(note + note_len, "'%s' of ", what);
 191         }
 192         note_len += sprintf(note + note_len, "%.*s", remote_len, remote);
 193         fprintf(fp, "%s\n", note);
 194         return update_local_ref(local_name, head, note, verbose, force);
 195 }
 196
 197 static char *keep;
 198 static void remove_keep(void)
 199 {
 200         if (keep && *keep)
 201                 unlink(keep);
 202 }
 203
 204 static void remove_keep_on_signal(int signo)
 205 {
 206         remove_keep();
 207         signal(SIGINT, SIG_DFL);
 208         raise(signo);
 209 }
 210
 211 static char *find_local_name(const char *remote_name, const char *refs,
 212                              int *force_p, int *not_for_merge_p)
 213 {
 214         const char *ref = refs;
 215         int len = strlen(remote_name);
 216
 217         while (ref) {
 218                 const char *next;
 219                 int single_force, not_for_merge;
 220
 221                 while (*ref == '\n')
 222                         ref++;
 223                 if (!*ref)
 224                         break;
 225                 next = strchr(ref, '\n');
 226
 227                 single_force = not_for_merge = 0;
 228                 if (*ref == '+') {
 229                         single_force = 1;
 230                         ref++;
 231                 }
 232                 if (*ref == '.') {
 233                         not_for_merge = 1;
 234                         ref++;
 235                         if (*ref == '+') {
 236                                 single_force = 1;
 237                                 ref++;
 238                         }
 239                 }
 240                 if (!strncmp(remote_name, ref, len) && ref[len] == ':') {
 241                         const char *local_part = ref + len + 1;
 242                         char *ret;
 243                         int retlen;
 244
 245                         if (!next)
 246                                 retlen = strlen(local_part);
 247                         else
 248                                 retlen = next - local_part;
 249                         ret = xmalloc(retlen + 1);
 250                         memcpy(ret, local_part, retlen);
 251                         ret[retlen] = 0;
 252                         *force_p = single_force;
 253                         *not_for_merge_p = not_for_merge;
 254                         return ret;
 255                 }
 256                 ref = next;
 257         }
 258         return NULL;
 259 }
 260
 261 static int fetch_native_store(FILE *fp,
 262                               const char *remote,
 263                               const char *remote_nick,
 264                               const char *refs,
 265                               int verbose, int force)
 266 {
 267         char buffer[1024];
 268         int err = 0;
 269
 270         signal(SIGINT, remove_keep_on_signal);
 271         atexit(remove_keep);
 272
 273         while (fgets(buffer, sizeof(buffer), stdin)) {
 274                 int len;
 275                 char *cp;
 276                 char *local_name;
 277                 int single_force, not_for_merge;
 278
 279                 for (cp = buffer; *cp && !isspace(*cp); cp++)
 280                         ;
 281                 if (*cp)
 282                         *cp++ = 0;
 283                 len = strlen(cp);
 284                 if (len && cp[len-1] == '\n')
 285                         cp[--len] = 0;
 286                 if (!strcmp(buffer, "failed"))
 287                         die("Fetch failure: %s", remote);
 288                 if (!strcmp(buffer, "pack"))
 289                         continue;
 290                 if (!strcmp(buffer, "keep")) {
 291                         char *od = get_object_directory();
 292                         int len = strlen(od) + strlen(cp) + 50;
 293                         keep = xmalloc(len);
 294                         sprintf(keep, "%s/pack/pack-%s.keep", od, cp);
 295                         continue;
 296                 }
 297
 298                 local_name = find_local_name(cp, refs,
 299                                              &single_force, &not_for_merge);
 300                 if (!local_name)
 301                         continue;
 302                 err |= append_fetch_head(fp,
 303                                          buffer, remote, cp, remote_nick,
 304                                          local_name, not_for_merge,
 305                                          verbose, force || single_force);
 306         }
 307         return err;
 308 }
 309
 310 static int parse_reflist(const char *reflist)
 311 {
 312         const char *ref;
 313
 314         printf("refs='");
 315         for (ref = reflist; ref; ) {
 316                 const char *next;
 317                 while (*ref && isspace(*ref))
 318                         ref++;
 319                 if (!*ref)
 320                         break;
 321                 for (next = ref; *next && !isspace(*next); next++)
 322                         ;
 323                 printf("\n%.*s", (int)(next - ref), ref);
 324                 ref = next;
 325         }
 326         printf("'\n");
 327
 328         printf("rref='");
 329         for (ref = reflist; ref; ) {
 330                 const char *next, *colon;
 331                 while (*ref && isspace(*ref))
 332                         ref++;
 333                 if (!*ref)
 334                         break;
 335                 for (next = ref; *next && !isspace(*next); next++)
 336                         ;
 337                 if (*ref == '.')
 338                         ref++;
 339                 if (*ref == '+')
 340                         ref++;
 341                 colon = strchr(ref, ':');
 342                 putchar('\n');
 343                 printf("%.*s", (int)((colon ? colon : next) - ref), ref);
 344                 ref = next;
 345         }
 346         printf("'\n");
 347         return 0;
 348 }
 349
 350 static int expand_refs_wildcard(const char *ls_remote_result, int numrefs,
 351                                 const char **refs)
 352 {
 353         int i, matchlen, replacelen;
 354         int found_one = 0;
 355         const char *remote = *refs++;
 356         numrefs--;
 357
 358         if (numrefs == 0) {
 359                 fprintf(stderr, "Nothing specified for fetching with remote.%s.fetch\n",
 360                         remote);
 361                 printf("empty\n");
 362         }
 363
 364         for (i = 0; i < numrefs; i++) {
 365                 const char *ref = refs[i];
 366                 const char *lref = ref;
 367                 const char *colon;
 368                 const char *tail;
 369                 const char *ls;
 370                 const char *next;
 371
 372                 if (*lref == '+')
 373                         lref++;
 374                 colon = strchr(lref, ':');
 375                 tail = lref + strlen(lref);
 376                 if (!(colon &&
 377                       2 < colon - lref &&
 378                       colon[-1] == '*' &&
 379                       colon[-2] == '/' &&
 380                       2 < tail - (colon + 1) &&
 381                       tail[-1] == '*' &&
 382                       tail[-2] == '/')) {
 383                         /* not a glob */
 384                         if (!found_one++)
 385                                 printf("explicit\n");
 386                         printf("%s\n", ref);
 387                         continue;
 388                 }
 389
 390                 /* glob */
 391                 if (!found_one++)
 392                         printf("glob\n");
 393
 394                 /* lref to colon-2 is remote hierarchy name;
 395                  * colon+1 to tail-2 is local.
 396                  */
 397                 matchlen = (colon-1) - lref;
 398                 replacelen = (tail-1) - (colon+1);
 399                 for (ls = ls_remote_result; ls; ls = next) {
 400                         const char *eol;
 401                         unsigned char sha1[20];
 402                         int namelen;
 403
 404                         while (*ls && isspace(*ls))
 405                                 ls++;
 406                         next = strchr(ls, '\n');
 407                         eol = !next ? (ls + strlen(ls)) : next;
 408                         if (!memcmp("^{}", eol-3, 3))
 409                                 continue;
 410                         if (eol - ls < 40)
 411                                 continue;
 412                         if (get_sha1_hex(ls, sha1))
 413                                 continue;
 414                         ls += 40;
 415                         while (ls < eol && isspace(*ls))
 416                                 ls++;
 417                         /* ls to next (or eol) is the name.
 418                          * is it identical to lref to colon-2?
 419                          */
 420                         if ((eol - ls) <= matchlen ||
 421                             strncmp(ls, lref, matchlen))
 422                                 continue;
 423
 424                         /* Yes, it is a match */
 425                         namelen = eol - ls;
 426                         if (lref != ref)
 427                                 putchar('+');
 428                         printf("%.*s:%.*s%.*s\n",
 429                                namelen, ls,
 430                                replacelen, colon + 1,
 431                                namelen - matchlen, ls + matchlen);
 432                 }
 433         }
 434         return 0;
 435 }
 436
 437 int cmd_fetch__tool(int argc, const char **argv, const char *prefix)
 438 {
 439         int verbose = 0;
 440         int force = 0;
 441
 442         while (1 < argc) {
 443                 const char *arg = argv[1];
 444                 if (!strcmp("-v", arg))
 445                         verbose = 1;
 446                 else if (!strcmp("-f", arg))
 447                         force = 1;
 448                 else
 449                         break;
 450                 argc--;
 451                 argv++;
 452         }
 453
 454         if (argc <= 1)
 455                 return error("Missing subcommand");
 456
 457         if (!strcmp("append-fetch-head", argv[1])) {
 458                 int result;
 459                 FILE *fp;
 460
 461                 if (argc != 8)
 462                         return error("append-fetch-head takes 6 args");
 463                 fp = fopen(git_path("FETCH_HEAD"), "a");
 464                 result = append_fetch_head(fp, argv[2], argv[3],
 465                                            argv[4], argv[5],
 466                                            argv[6], !!argv[7][0],
 467                                            verbose, force);
 468                 fclose(fp);
 469                 return result;
 470         }
 471         if (!strcmp("native-store", argv[1])) {
 472                 int result;
 473                 FILE *fp;
 474
 475                 if (argc != 5)
 476                         return error("fetch-native-store takes 3 args");
 477                 fp = fopen(git_path("FETCH_HEAD"), "a");
 478                 result = fetch_native_store(fp, argv[2], argv[3], argv[4],
 479                                             verbose, force);
 480                 fclose(fp);
 481                 return result;
 482         }
 483         if (!strcmp("parse-reflist", argv[1])) {
 484                 const char *reflist;
 485                 if (argc != 3)
 486                         return error("parse-reflist takes 1 arg");
 487                 reflist = argv[2];
 488                 if (!strcmp(reflist, "-"))
 489                         reflist = get_stdin();
 490                 return parse_reflist(reflist);
 491         }
 492         if (!strcmp("expand-refs-wildcard", argv[1])) {
 493                 const char *reflist;
 494                 if (argc < 4)
 495                         return error("expand-refs-wildcard takes at least 2 args");
 496                 reflist = argv[2];
 497                 if (!strcmp(reflist, "-"))
 498                         reflist = get_stdin();
 499                 return expand_refs_wildcard(reflist, argc - 3, argv + 3);
 500         }
 501
 502         return error("Unknown subcommand: %s", argv[1]);
 503 }