Andrew's git - gitweb.git/blob - builtin-fetch--tool.c

   1#include "builtin.h"
   2#include "cache.h"
   3#include "refs.h"
   4#include "commit.h"
   5
   6#define CHUNK_SIZE 1024
   7
   8static char *get_stdin(void)
   9{
  10        size_t offset = 0;
  11        char *data = xmalloc(CHUNK_SIZE);
  12
  13        while (1) {
  14                ssize_t cnt = xread(0, data + offset, CHUNK_SIZE);
  15                if (cnt < 0)
  16                        die("error reading standard input: %s",
  17                            strerror(errno));
  18                if (cnt == 0) {
  19                        data[offset] = 0;
  20                        break;
  21                }
  22                offset += cnt;
  23                data = xrealloc(data, offset + CHUNK_SIZE);
  24        }
  25        return data;
  26}
  27
  28static void show_new(enum object_type type, unsigned char *sha1_new)
  29{
  30        fprintf(stderr, "  %s: %s\n", typename(type),
  31                find_unique_abbrev(sha1_new, DEFAULT_ABBREV));
  32}
  33
  34static int update_ref(const char *action,
  35                      const char *refname,
  36                      unsigned char *sha1,
  37                      unsigned char *oldval)
  38{
  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        snprintf(msg, sizeof(msg), "%s: %s", rla, action);
  46        lock = lock_any_ref_for_update(refname, oldval, 0);
  47        if (!lock)
  48                return 1;
  49        if (write_ref_sha1(lock, sha1, msg) < 0)
  50                return 1;
  51        return 0;
  52}
  53
  54static int update_local_ref(const char *name,
  55                            const char *new_head,
  56                            const char *note,
  57                            int verbose, int force)
  58{
  59        unsigned char sha1_old[20], sha1_new[20];
  60        char oldh[41], newh[41];
  61        struct commit *current, *updated;
  62        enum object_type type;
  63
  64        if (get_sha1_hex(new_head, sha1_new))
  65                die("malformed object name %s", new_head);
  66
  67        type = sha1_object_info(sha1_new, NULL);
  68        if (type < 0)
  69                die("object %s not found", new_head);
  70
  71        if (!*name) {
  72                /* Not storing */
  73                if (verbose) {
  74                        fprintf(stderr, "* fetched %s\n", note);
  75                        show_new(type, sha1_new);
  76                }
  77                return 0;
  78        }
  79
  80        if (get_sha1(name, sha1_old)) {
  81                char *msg;
  82        just_store:
  83                /* new ref */
  84                if (!strncmp(name, "refs/tags/", 10))
  85                        msg = "storing tag";
  86                else
  87                        msg = "storing head";
  88                fprintf(stderr, "* %s: storing %s\n",
  89                        name, note);
  90                show_new(type, sha1_new);
  91                return update_ref(msg, name, sha1_new, NULL);
  92        }
  93
  94        if (!hashcmp(sha1_old, sha1_new)) {
  95                if (verbose) {
  96                        fprintf(stderr, "* %s: same as %s\n", name, note);
  97                        show_new(type, sha1_new);
  98                }
  99                return 0;
 100        }
 101
 102        if (!strncmp(name, "refs/tags/", 10)) {
 103                fprintf(stderr, "* %s: updating with %s\n", name, note);
 104                show_new(type, sha1_new);
 105                return update_ref("updating tag", name, sha1_new, NULL);
 106        }
 107
 108        current = lookup_commit_reference(sha1_old);
 109        updated = lookup_commit_reference(sha1_new);
 110        if (!current || !updated)
 111                goto just_store;
 112
 113        strcpy(oldh, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 114        strcpy(newh, find_unique_abbrev(sha1_new, DEFAULT_ABBREV));
 115
 116        if (in_merge_bases(current, &updated, 1)) {
 117                fprintf(stderr, "* %s: fast forward to %s\n",
 118                        name, note);
 119                fprintf(stderr, "  old..new: %s..%s\n", oldh, newh);
 120                return update_ref("fast forward", name, sha1_new, sha1_old);
 121        }
 122        if (!force) {
 123                fprintf(stderr,
 124                        "* %s: not updating to non-fast forward %s\n",
 125                        name, note);
 126                fprintf(stderr,
 127                        "  old...new: %s...%s\n", oldh, newh);
 128                return 1;
 129        }
 130        fprintf(stderr,
 131                "* %s: forcing update to non-fast forward %s\n",
 132                name, note);
 133        fprintf(stderr, "  old...new: %s...%s\n", oldh, newh);
 134        return update_ref("forced-update", name, sha1_new, sha1_old);
 135}
 136
 137static int append_fetch_head(FILE *fp,
 138                             const char *head, const char *remote,
 139                             const char *remote_name, const char *remote_nick,
 140                             const char *local_name, int not_for_merge,
 141                             int verbose, int force)
 142{
 143        struct commit *commit;
 144        int remote_len, i, note_len;
 145        unsigned char sha1[20];
 146        char note[1024];
 147        const char *what, *kind;
 148
 149        if (get_sha1(head, sha1))
 150                return error("Not a valid object name: %s", head);
 151        commit = lookup_commit_reference(sha1);
 152        if (!commit)
 153                not_for_merge = 1;
 154
 155        if (!strcmp(remote_name, "HEAD")) {
 156                kind = "";
 157                what = "";
 158        }
 159        else if (!strncmp(remote_name, "refs/heads/", 11)) {
 160                kind = "branch";
 161                what = remote_name + 11;
 162        }
 163        else if (!strncmp(remote_name, "refs/tags/", 10)) {
 164                kind = "tag";
 165                what = remote_name + 10;
 166        }
 167        else if (!strncmp(remote_name, "refs/remotes/", 13)) {
 168                kind = "remote branch";
 169                what = remote_name + 13;
 170        }
 171        else {
 172                kind = "";
 173                what = remote_name;
 174        }
 175
 176        remote_len = strlen(remote);
 177        for (i = remote_len - 1; remote[i] == '/' && 0 <= i; i--)
 178                ;
 179        remote_len = i + 1;
 180        if (4 < i && !strncmp(".git", remote + i - 3, 4))
 181                remote_len = i - 3;
 182
 183        note_len = 0;
 184        if (*what) {
 185                if (*kind)
 186                        note_len += sprintf(note + note_len, "%s ", kind);
 187                note_len += sprintf(note + note_len, "'%s' of ", what);
 188        }
 189        note_len += sprintf(note + note_len, "%.*s", remote_len, remote);
 190        fprintf(fp, "%s\t%s\t%s\n",
 191                sha1_to_hex(commit ? commit->object.sha1 : sha1),
 192                not_for_merge ? "not-for-merge" : "",
 193                note);
 194        return update_local_ref(local_name, head, note, verbose, force);
 195}
 196
 197static char *keep;
 198static void remove_keep(void)
 199{
 200        if (keep && *keep)
 201                unlink(keep);
 202}
 203
 204static void remove_keep_on_signal(int signo)
 205{
 206        remove_keep();
 207        signal(SIGINT, SIG_DFL);
 208        raise(signo);
 209}
 210
 211static 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
 261static 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
 310static 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
 350static 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
 437static int pick_rref(int sha1_only, const char *rref, const char *ls_remote_result)
 438{
 439        int err = 0;
 440        int lrr_count = lrr_count, i, pass;
 441        const char *cp;
 442        struct lrr {
 443                const char *line;
 444                const char *name;
 445                int namelen;
 446                int shown;
 447        } *lrr_list = lrr_list;
 448
 449        for (pass = 0; pass < 2; pass++) {
 450                /* pass 0 counts and allocates, pass 1 fills... */
 451                cp = ls_remote_result;
 452                i = 0;
 453                while (1) {
 454                        const char *np;
 455                        while (*cp && isspace(*cp))
 456                                cp++;
 457                        if (!*cp)
 458                                break;
 459                        np = strchr(cp, '\n');
 460                        if (!np)
 461                                np = cp + strlen(cp);
 462                        if (pass) {
 463                                lrr_list[i].line = cp;
 464                                lrr_list[i].name = cp + 41;
 465                                lrr_list[i].namelen = np - (cp + 41);
 466                        }
 467                        i++;
 468                        cp = np;
 469                }
 470                if (!pass) {
 471                        lrr_count = i;
 472                        lrr_list = xcalloc(lrr_count, sizeof(*lrr_list));
 473                }
 474        }
 475
 476        while (1) {
 477                const char *next;
 478                int rreflen;
 479                int i;
 480
 481                while (*rref && isspace(*rref))
 482                        rref++;
 483                if (!*rref)
 484                        break;
 485                next = strchr(rref, '\n');
 486                if (!next)
 487                        next = rref + strlen(rref);
 488                rreflen = next - rref;
 489
 490                for (i = 0; i < lrr_count; i++) {
 491                        struct lrr *lrr = &(lrr_list[i]);
 492
 493                        if (rreflen == lrr->namelen &&
 494                            !memcmp(lrr->name, rref, rreflen)) {
 495                                if (!lrr->shown)
 496                                        printf("%.*s\n",
 497                                               sha1_only ? 40 : lrr->namelen + 41,
 498                                               lrr->line);
 499                                lrr->shown = 1;
 500                                break;
 501                        }
 502                }
 503                if (lrr_count <= i) {
 504                        error("pick-rref: %.*s not found", rreflen, rref);
 505                        err = 1;
 506                }
 507                rref = next;
 508        }
 509        free(lrr_list);
 510        return err;
 511}
 512
 513int cmd_fetch__tool(int argc, const char **argv, const char *prefix)
 514{
 515        int verbose = 0;
 516        int force = 0;
 517        int sopt = 0;
 518
 519        while (1 < argc) {
 520                const char *arg = argv[1];
 521                if (!strcmp("-v", arg))
 522                        verbose = 1;
 523                else if (!strcmp("-f", arg))
 524                        force = 1;
 525                else if (!strcmp("-s", arg))
 526                        sopt = 1;
 527                else
 528                        break;
 529                argc--;
 530                argv++;
 531        }
 532
 533        if (argc <= 1)
 534                return error("Missing subcommand");
 535
 536        if (!strcmp("append-fetch-head", argv[1])) {
 537                int result;
 538                FILE *fp;
 539
 540                if (argc != 8)
 541                        return error("append-fetch-head takes 6 args");
 542                fp = fopen(git_path("FETCH_HEAD"), "a");
 543                result = append_fetch_head(fp, argv[2], argv[3],
 544                                           argv[4], argv[5],
 545                                           argv[6], !!argv[7][0],
 546                                           verbose, force);
 547                fclose(fp);
 548                return result;
 549        }
 550        if (!strcmp("native-store", argv[1])) {
 551                int result;
 552                FILE *fp;
 553
 554                if (argc != 5)
 555                        return error("fetch-native-store takes 3 args");
 556                fp = fopen(git_path("FETCH_HEAD"), "a");
 557                result = fetch_native_store(fp, argv[2], argv[3], argv[4],
 558                                            verbose, force);
 559                fclose(fp);
 560                return result;
 561        }
 562        if (!strcmp("parse-reflist", argv[1])) {
 563                const char *reflist;
 564                if (argc != 3)
 565                        return error("parse-reflist takes 1 arg");
 566                reflist = argv[2];
 567                if (!strcmp(reflist, "-"))
 568                        reflist = get_stdin();
 569                return parse_reflist(reflist);
 570        }
 571        if (!strcmp("pick-rref", argv[1])) {
 572                const char *ls_remote_result;
 573                if (argc != 4)
 574                        return error("pick-rref takes 2 args");
 575                ls_remote_result = argv[3];
 576                if (!strcmp(ls_remote_result, "-"))
 577                        ls_remote_result = get_stdin();
 578                return pick_rref(sopt, argv[2], ls_remote_result);
 579        }
 580        if (!strcmp("expand-refs-wildcard", argv[1])) {
 581                const char *reflist;
 582                if (argc < 4)
 583                        return error("expand-refs-wildcard takes at least 2 args");
 584                reflist = argv[2];
 585                if (!strcmp(reflist, "-"))
 586                        reflist = get_stdin();
 587                return expand_refs_wildcard(reflist, argc - 3, argv + 3);
 588        }
 589
 590        return error("Unknown subcommand: %s", argv[1]);
 591}