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

   1#include "cache.h"
   2#include "refs.h"
   3#include "commit.h"
   4
   5#define CHUNK_SIZE 1024
   6
   7static 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
  27static 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
  33static 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
  56static 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
 139static 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
 199static char *keep;
 200static void remove_keep(void)
 201{
 202        if (keep && *keep)
 203                unlink(keep);
 204}
 205
 206static void remove_keep_on_signal(int signo)
 207{
 208        remove_keep();
 209        signal(SIGINT, SIG_DFL);
 210        raise(signo);
 211}
 212
 213static 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
 263static 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
 312static 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
 352static 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
 439int 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}