Andrew's git - gitweb.git/blob

   1/*
   2 * "git fetch"
   3 */
   4#include "cache.h"
   5#include "refs.h"
   6#include "commit.h"
   7#include "builtin.h"
   8#include "path-list.h"
   9#include "remote.h"
  10#include "transport.h"
  11
  12static const char fetch_usage[] = "git-fetch [-a | --append] [--upload-pack <upload-pack>] [-f | --force] [--no-tags] [-t | --tags] [-k | --keep] [-u | --update-head-ok] [--depth <depth>] [-v | --verbose] [<repository> <refspec>...]";
  13
  14static int append, force, tags, no_tags, update_head_ok, verbose, quiet;
  15static char *default_rla = NULL;
  16static struct transport *transport;
  17
  18static void unlock_pack(void)
  19{
  20        if (transport)
  21                transport_unlock_pack(transport);
  22}
  23
  24static void unlock_pack_on_signal(int signo)
  25{
  26        unlock_pack();
  27        signal(SIGINT, SIG_DFL);
  28        raise(signo);
  29}
  30
  31static void add_merge_config(struct ref **head,
  32                           struct ref *remote_refs,
  33                           struct branch *branch,
  34                           struct ref ***tail)
  35{
  36        int i;
  37
  38        for (i = 0; i < branch->merge_nr; i++) {
  39                struct ref *rm, **old_tail = *tail;
  40                struct refspec refspec;
  41
  42                for (rm = *head; rm; rm = rm->next) {
  43                        if (branch_merge_matches(branch, i, rm->name)) {
  44                                rm->merge = 1;
  45                                break;
  46                        }
  47                }
  48                if (rm)
  49                        continue;
  50
  51                /* Not fetched to a tracking branch?  We need to fetch
  52                 * it anyway to allow this branch's "branch.$name.merge"
  53                 * to be honored by git-pull.
  54                 */
  55                refspec.src = branch->merge[i]->src;
  56                refspec.dst = NULL;
  57                refspec.pattern = 0;
  58                refspec.force = 0;
  59                get_fetch_map(remote_refs, &refspec, tail);
  60                for (rm = *old_tail; rm; rm = rm->next)
  61                        rm->merge = 1;
  62        }
  63}
  64
  65static struct ref *get_ref_map(struct transport *transport,
  66                               struct refspec *refs, int ref_count, int tags,
  67                               int *autotags)
  68{
  69        int i;
  70        struct ref *rm;
  71        struct ref *ref_map = NULL;
  72        struct ref **tail = &ref_map;
  73
  74        struct ref *remote_refs = transport_get_remote_refs(transport);
  75
  76        if (ref_count || tags) {
  77                for (i = 0; i < ref_count; i++) {
  78                        get_fetch_map(remote_refs, &refs[i], &tail);
  79                        if (refs[i].dst && refs[i].dst[0])
  80                                *autotags = 1;
  81                }
  82                /* Merge everything on the command line, but not --tags */
  83                for (rm = ref_map; rm; rm = rm->next)
  84                        rm->merge = 1;
  85                if (tags) {
  86                        struct refspec refspec;
  87                        refspec.src = "refs/tags/";
  88                        refspec.dst = "refs/tags/";
  89                        refspec.pattern = 1;
  90                        refspec.force = 0;
  91                        get_fetch_map(remote_refs, &refspec, &tail);
  92                }
  93        } else {
  94                /* Use the defaults */
  95                struct remote *remote = transport->remote;
  96                struct branch *branch = branch_get(NULL);
  97                int has_merge = branch_has_merge_config(branch);
  98                if (remote && (remote->fetch_refspec_nr || has_merge)) {
  99                        for (i = 0; i < remote->fetch_refspec_nr; i++) {
 100                                get_fetch_map(remote_refs, &remote->fetch[i], &tail);
 101                                if (remote->fetch[i].dst &&
 102                                    remote->fetch[i].dst[0])
 103                                        *autotags = 1;
 104                                if (!i && !has_merge && ref_map &&
 105                                    !remote->fetch[0].pattern)
 106                                        ref_map->merge = 1;
 107                        }
 108                        if (has_merge)
 109                                add_merge_config(&ref_map, remote_refs, branch, &tail);
 110                } else {
 111                        ref_map = get_remote_ref(remote_refs, "HEAD");
 112                        ref_map->merge = 1;
 113                }
 114        }
 115        ref_remove_duplicates(ref_map);
 116
 117        return ref_map;
 118}
 119
 120static void show_new(enum object_type type, unsigned char *sha1_new)
 121{
 122        fprintf(stderr, "  %s: %s\n", typename(type),
 123                find_unique_abbrev(sha1_new, DEFAULT_ABBREV));
 124}
 125
 126static int s_update_ref(const char *action,
 127                        struct ref *ref,
 128                        int check_old)
 129{
 130        char msg[1024];
 131        char *rla = getenv("GIT_REFLOG_ACTION");
 132        static struct ref_lock *lock;
 133
 134        if (!rla)
 135                rla = default_rla;
 136        snprintf(msg, sizeof(msg), "%s: %s", rla, action);
 137        lock = lock_any_ref_for_update(ref->name,
 138                                       check_old ? ref->old_sha1 : NULL, 0);
 139        if (!lock)
 140                return 1;
 141        if (write_ref_sha1(lock, ref->new_sha1, msg) < 0)
 142                return 1;
 143        return 0;
 144}
 145
 146static int update_local_ref(struct ref *ref,
 147                            const char *note,
 148                            int verbose)
 149{
 150        char oldh[41], newh[41];
 151        struct commit *current = NULL, *updated;
 152        enum object_type type;
 153        struct branch *current_branch = branch_get(NULL);
 154
 155        type = sha1_object_info(ref->new_sha1, NULL);
 156        if (type < 0)
 157                die("object %s not found", sha1_to_hex(ref->new_sha1));
 158
 159        if (!*ref->name) {
 160                /* Not storing */
 161                if (verbose) {
 162                        fprintf(stderr, "* fetched %s\n", note);
 163                        show_new(type, ref->new_sha1);
 164                }
 165                return 0;
 166        }
 167
 168        if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
 169                if (verbose) {
 170                        fprintf(stderr, "* %s: same as %s\n",
 171                                ref->name, note);
 172                        show_new(type, ref->new_sha1);
 173                }
 174                return 0;
 175        }
 176
 177        if (current_branch &&
 178            !strcmp(ref->name, current_branch->name) &&
 179            !(update_head_ok || is_bare_repository()) &&
 180            !is_null_sha1(ref->old_sha1)) {
 181                /*
 182                 * If this is the head, and it's not okay to update
 183                 * the head, and the old value of the head isn't empty...
 184                 */
 185                fprintf(stderr,
 186                        " * %s: Cannot fetch into the current branch.\n",
 187                        ref->name);
 188                return 1;
 189        }
 190
 191        if (!is_null_sha1(ref->old_sha1) &&
 192            !prefixcmp(ref->name, "refs/tags/")) {
 193                fprintf(stderr, "* %s: updating with %s\n",
 194                        ref->name, note);
 195                show_new(type, ref->new_sha1);
 196                return s_update_ref("updating tag", ref, 0);
 197        }
 198
 199        current = lookup_commit_reference(ref->old_sha1);
 200        updated = lookup_commit_reference(ref->new_sha1);
 201        if (!current || !updated) {
 202                char *msg;
 203                if (!strncmp(ref->name, "refs/tags/", 10))
 204                        msg = "storing tag";
 205                else
 206                        msg = "storing head";
 207                fprintf(stderr, "* %s: storing %s\n",
 208                        ref->name, note);
 209                show_new(type, ref->new_sha1);
 210                return s_update_ref(msg, ref, 0);
 211        }
 212
 213        strcpy(oldh, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 214        strcpy(newh, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 215
 216        if (in_merge_bases(current, &updated, 1)) {
 217                fprintf(stderr, "* %s: fast forward to %s\n",
 218                        ref->name, note);
 219                fprintf(stderr, "  old..new: %s..%s\n", oldh, newh);
 220                return s_update_ref("fast forward", ref, 1);
 221        }
 222        if (!force && !ref->force) {
 223                fprintf(stderr,
 224                        "* %s: not updating to non-fast forward %s\n",
 225                        ref->name, note);
 226                fprintf(stderr,
 227                        "  old...new: %s...%s\n", oldh, newh);
 228                return 1;
 229        }
 230        fprintf(stderr,
 231                "* %s: forcing update to non-fast forward %s\n",
 232                ref->name, note);
 233        fprintf(stderr, "  old...new: %s...%s\n", oldh, newh);
 234        return s_update_ref("forced-update", ref, 1);
 235}
 236
 237static void store_updated_refs(const char *url, struct ref *ref_map)
 238{
 239        FILE *fp;
 240        struct commit *commit;
 241        int url_len, i, note_len;
 242        char note[1024];
 243        const char *what, *kind;
 244        struct ref *rm;
 245
 246        fp = fopen(git_path("FETCH_HEAD"), "a");
 247        for (rm = ref_map; rm; rm = rm->next) {
 248                struct ref *ref = NULL;
 249
 250                if (rm->peer_ref) {
 251                        ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
 252                        strcpy(ref->name, rm->peer_ref->name);
 253                        hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
 254                        hashcpy(ref->new_sha1, rm->old_sha1);
 255                        ref->force = rm->peer_ref->force;
 256                }
 257
 258                commit = lookup_commit_reference(rm->old_sha1);
 259                if (!commit)
 260                        rm->merge = 0;
 261
 262                if (!strcmp(rm->name, "HEAD")) {
 263                        kind = "";
 264                        what = "";
 265                }
 266                else if (!prefixcmp(rm->name, "refs/heads/")) {
 267                        kind = "branch";
 268                        what = rm->name + 11;
 269                }
 270                else if (!prefixcmp(rm->name, "refs/tags/")) {
 271                        kind = "tag";
 272                        what = rm->name + 10;
 273                }
 274                else if (!prefixcmp(rm->name, "refs/remotes/")) {
 275                        kind = "remote branch";
 276                        what = rm->name + 13;
 277                }
 278                else {
 279                        kind = "";
 280                        what = rm->name;
 281                }
 282
 283                url_len = strlen(url);
 284                for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 285                        ;
 286                url_len = i + 1;
 287                if (4 < i && !strncmp(".git", url + i - 3, 4))
 288                        url_len = i - 3;
 289
 290                note_len = 0;
 291                if (*what) {
 292                        if (*kind)
 293                                note_len += sprintf(note + note_len, "%s ",
 294                                                    kind);
 295                        note_len += sprintf(note + note_len, "'%s' of ", what);
 296                }
 297                note_len += sprintf(note + note_len, "%.*s", url_len, url);
 298                fprintf(fp, "%s\t%s\t%s\n",
 299                        sha1_to_hex(commit ? commit->object.sha1 :
 300                                    rm->old_sha1),
 301                        rm->merge ? "" : "not-for-merge",
 302                        note);
 303
 304                if (ref)
 305                        update_local_ref(ref, note, verbose);
 306        }
 307        fclose(fp);
 308}
 309
 310static int fetch_refs(struct transport *transport, struct ref *ref_map)
 311{
 312        int ret = transport_fetch_refs(transport, ref_map);
 313        if (!ret)
 314                store_updated_refs(transport->url, ref_map);
 315        transport_unlock_pack(transport);
 316        return ret;
 317}
 318
 319static int add_existing(const char *refname, const unsigned char *sha1,
 320                        int flag, void *cbdata)
 321{
 322        struct path_list *list = (struct path_list *)cbdata;
 323        path_list_insert(refname, list);
 324        return 0;
 325}
 326
 327static struct ref *find_non_local_tags(struct transport *transport,
 328                                       struct ref *fetch_map)
 329{
 330        static struct path_list existing_refs = { NULL, 0, 0, 0 };
 331        struct path_list new_refs = { NULL, 0, 0, 1 };
 332        char *ref_name;
 333        int ref_name_len;
 334        unsigned char *ref_sha1;
 335        struct ref *tag_ref;
 336        struct ref *rm = NULL;
 337        struct ref *ref_map = NULL;
 338        struct ref **tail = &ref_map;
 339        struct ref *ref;
 340
 341        for_each_ref(add_existing, &existing_refs);
 342        for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
 343                if (prefixcmp(ref->name, "refs/tags"))
 344                        continue;
 345
 346                ref_name = xstrdup(ref->name);
 347                ref_name_len = strlen(ref_name);
 348                ref_sha1 = ref->old_sha1;
 349
 350                if (!strcmp(ref_name + ref_name_len - 3, "^{}")) {
 351                        ref_name[ref_name_len - 3] = 0;
 352                        tag_ref = transport_get_remote_refs(transport);
 353                        while (tag_ref) {
 354                                if (!strcmp(tag_ref->name, ref_name)) {
 355                                        ref_sha1 = tag_ref->old_sha1;
 356                                        break;
 357                                }
 358                                tag_ref = tag_ref->next;
 359                        }
 360                }
 361
 362                if (!path_list_has_path(&existing_refs, ref_name) &&
 363                    !path_list_has_path(&new_refs, ref_name) &&
 364                    lookup_object(ref->old_sha1)) {
 365                        fprintf(stderr, "Auto-following %s\n",
 366                                ref_name);
 367
 368                        path_list_insert(ref_name, &new_refs);
 369
 370                        rm = alloc_ref(strlen(ref_name) + 1);
 371                        strcpy(rm->name, ref_name);
 372                        rm->peer_ref = alloc_ref(strlen(ref_name) + 1);
 373                        strcpy(rm->peer_ref->name, ref_name);
 374                        hashcpy(rm->old_sha1, ref_sha1);
 375
 376                        *tail = rm;
 377                        tail = &rm->next;
 378                }
 379                free(ref_name);
 380        }
 381
 382        return ref_map;
 383}
 384
 385static int do_fetch(struct transport *transport,
 386                    struct refspec *refs, int ref_count)
 387{
 388        struct ref *ref_map, *fetch_map;
 389        struct ref *rm;
 390        int autotags = (transport->remote->fetch_tags == 1);
 391        if (transport->remote->fetch_tags == 2 && !no_tags)
 392                tags = 1;
 393        if (transport->remote->fetch_tags == -1)
 394                no_tags = 1;
 395
 396        if (!transport->get_refs_list || !transport->fetch)
 397                die("Don't know how to fetch from %s", transport->url);
 398
 399        /* if not appending, truncate FETCH_HEAD */
 400        if (!append)
 401                fclose(fopen(git_path("FETCH_HEAD"), "w"));
 402
 403        ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
 404
 405        for (rm = ref_map; rm; rm = rm->next) {
 406                if (rm->peer_ref)
 407                        read_ref(rm->peer_ref->name, rm->peer_ref->old_sha1);
 408        }
 409
 410        if (fetch_refs(transport, ref_map)) {
 411                free_refs(ref_map);
 412                return 1;
 413        }
 414
 415        fetch_map = ref_map;
 416
 417        /* if neither --no-tags nor --tags was specified, do automated tag
 418         * following ... */
 419        if (!(tags || no_tags) && autotags) {
 420                ref_map = find_non_local_tags(transport, fetch_map);
 421                if (ref_map) {
 422                        transport_set_option(transport, TRANS_OPT_DEPTH, "0");
 423                        fetch_refs(transport, ref_map);
 424                }
 425                free_refs(ref_map);
 426        }
 427
 428        free_refs(fetch_map);
 429
 430        return 0;
 431}
 432
 433static void set_option(const char *name, const char *value)
 434{
 435        int r = transport_set_option(transport, name, value);
 436        if (r < 0)
 437                die("Option \"%s\" value \"%s\" is not valid for %s\n",
 438                        name, value, transport->url);
 439        if (r > 0)
 440                warning("Option \"%s\" is ignored for %s\n",
 441                        name, transport->url);
 442}
 443
 444int cmd_fetch(int argc, const char **argv, const char *prefix)
 445{
 446        struct remote *remote;
 447        int i, j, rla_offset;
 448        static const char **refs = NULL;
 449        int ref_nr = 0;
 450        int cmd_len = 0;
 451        const char *depth = NULL, *upload_pack = NULL;
 452        int keep = 0;
 453
 454        for (i = 1; i < argc; i++) {
 455                const char *arg = argv[i];
 456                cmd_len += strlen(arg);
 457
 458                if (arg[0] != '-')
 459                        break;
 460                if (!strcmp(arg, "--append") || !strcmp(arg, "-a")) {
 461                        append = 1;
 462                        continue;
 463                }
 464                if (!prefixcmp(arg, "--upload-pack=")) {
 465                        upload_pack = arg + 14;
 466                        continue;
 467                }
 468                if (!strcmp(arg, "--upload-pack")) {
 469                        i++;
 470                        if (i == argc)
 471                                usage(fetch_usage);
 472                        upload_pack = argv[i];
 473                        continue;
 474                }
 475                if (!strcmp(arg, "--force") || !strcmp(arg, "-f")) {
 476                        force = 1;
 477                        continue;
 478                }
 479                if (!strcmp(arg, "--no-tags")) {
 480                        no_tags = 1;
 481                        continue;
 482                }
 483                if (!strcmp(arg, "--tags") || !strcmp(arg, "-t")) {
 484                        tags = 1;
 485                        continue;
 486                }
 487                if (!strcmp(arg, "--keep") || !strcmp(arg, "-k")) {
 488                        keep = 1;
 489                        continue;
 490                }
 491                if (!strcmp(arg, "--update-head-ok") || !strcmp(arg, "-u")) {
 492                        update_head_ok = 1;
 493                        continue;
 494                }
 495                if (!prefixcmp(arg, "--depth=")) {
 496                        depth = arg + 8;
 497                        continue;
 498                }
 499                if (!strcmp(arg, "--depth")) {
 500                        i++;
 501                        if (i == argc)
 502                                usage(fetch_usage);
 503                        depth = argv[i];
 504                        continue;
 505                }
 506                if (!strcmp(arg, "--quiet")) {
 507                        quiet = 1;
 508                        continue;
 509                }
 510                if (!strcmp(arg, "--verbose") || !strcmp(arg, "-v")) {
 511                        verbose++;
 512                        continue;
 513                }
 514                usage(fetch_usage);
 515        }
 516
 517        for (j = i; j < argc; j++)
 518                cmd_len += strlen(argv[j]);
 519
 520        default_rla = xmalloc(cmd_len + 5 + argc + 1);
 521        sprintf(default_rla, "fetch");
 522        rla_offset = strlen(default_rla);
 523        for (j = 1; j < argc; j++) {
 524                sprintf(default_rla + rla_offset, " %s", argv[j]);
 525                rla_offset += strlen(argv[j]) + 1;
 526        }
 527
 528        if (i == argc)
 529                remote = remote_get(NULL);
 530        else
 531                remote = remote_get(argv[i++]);
 532
 533        transport = transport_get(remote, remote->url[0]);
 534        if (verbose >= 2)
 535                transport->verbose = 1;
 536        if (quiet)
 537                transport->verbose = -1;
 538        if (upload_pack)
 539                set_option(TRANS_OPT_UPLOADPACK, upload_pack);
 540        if (keep)
 541                set_option(TRANS_OPT_KEEP, "yes");
 542        if (depth)
 543                set_option(TRANS_OPT_DEPTH, depth);
 544
 545        if (!transport->url)
 546                die("Where do you want to fetch from today?");
 547
 548        if (i < argc) {
 549                int j = 0;
 550                refs = xcalloc(argc - i + 1, sizeof(const char *));
 551                while (i < argc) {
 552                        if (!strcmp(argv[i], "tag")) {
 553                                char *ref;
 554                                i++;
 555                                ref = xmalloc(strlen(argv[i]) * 2 + 22);
 556                                strcpy(ref, "refs/tags/");
 557                                strcat(ref, argv[i]);
 558                                strcat(ref, ":refs/tags/");
 559                                strcat(ref, argv[i]);
 560                                refs[j++] = ref;
 561                        } else
 562                                refs[j++] = argv[i];
 563                        i++;
 564                }
 565                refs[j] = NULL;
 566                ref_nr = j;
 567        }
 568
 569        signal(SIGINT, unlock_pack_on_signal);
 570        atexit(unlock_pack);
 571        return do_fetch(transport, parse_ref_spec(ref_nr, refs), ref_nr);
 572}