Andrew's git / gitweb.git / builtin-fetch.c
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builtin-fetch.con commit git-push: plumb in --mirror mode (94c89ba)
   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                           const 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                /*
  52                 * Not fetched to a tracking branch?  We need to fetch
  53                 * it anyway to allow this branch's "branch.$name.merge"
  54                 * to be honored by git-pull, but we do not have to
  55                 * fail if branch.$name.merge is misconfigured to point
  56                 * at a nonexisting branch.  If we were indeed called by
  57                 * git-pull, it will notice the misconfiguration because
  58                 * there is no entry in the resulting FETCH_HEAD marked
  59                 * for merging.
  60                 */
  61                refspec.src = branch->merge[i]->src;
  62                refspec.dst = NULL;
  63                refspec.pattern = 0;
  64                refspec.force = 0;
  65                get_fetch_map(remote_refs, &refspec, tail, 1);
  66                for (rm = *old_tail; rm; rm = rm->next)
  67                        rm->merge = 1;
  68        }
  69}
  70
  71static struct ref *get_ref_map(struct transport *transport,
  72                               struct refspec *refs, int ref_count, int tags,
  73                               int *autotags)
  74{
  75        int i;
  76        struct ref *rm;
  77        struct ref *ref_map = NULL;
  78        struct ref **tail = &ref_map;
  79
  80        const struct ref *remote_refs = transport_get_remote_refs(transport);
  81
  82        if (ref_count || tags) {
  83                for (i = 0; i < ref_count; i++) {
  84                        get_fetch_map(remote_refs, &refs[i], &tail, 0);
  85                        if (refs[i].dst && refs[i].dst[0])
  86                                *autotags = 1;
  87                }
  88                /* Merge everything on the command line, but not --tags */
  89                for (rm = ref_map; rm; rm = rm->next)
  90                        rm->merge = 1;
  91                if (tags) {
  92                        struct refspec refspec;
  93                        refspec.src = "refs/tags/";
  94                        refspec.dst = "refs/tags/";
  95                        refspec.pattern = 1;
  96                        refspec.force = 0;
  97                        get_fetch_map(remote_refs, &refspec, &tail, 0);
  98                }
  99        } else {
 100                /* Use the defaults */
 101                struct remote *remote = transport->remote;
 102                struct branch *branch = branch_get(NULL);
 103                int has_merge = branch_has_merge_config(branch);
 104                if (remote && (remote->fetch_refspec_nr || has_merge)) {
 105                        for (i = 0; i < remote->fetch_refspec_nr; i++) {
 106                                get_fetch_map(remote_refs, &remote->fetch[i], &tail, 0);
 107                                if (remote->fetch[i].dst &&
 108                                    remote->fetch[i].dst[0])
 109                                        *autotags = 1;
 110                                if (!i && !has_merge && ref_map &&
 111                                    !remote->fetch[0].pattern)
 112                                        ref_map->merge = 1;
 113                        }
 114                        /*
 115                         * if the remote we're fetching from is the same
 116                         * as given in branch.<name>.remote, we add the
 117                         * ref given in branch.<name>.merge, too.
 118                         */
 119                        if (has_merge &&
 120                            !strcmp(branch->remote_name, remote->name))
 121                                add_merge_config(&ref_map, remote_refs, branch, &tail);
 122                } else {
 123                        ref_map = get_remote_ref(remote_refs, "HEAD");
 124                        if (!ref_map)
 125                                die("Couldn't find remote ref HEAD");
 126                        ref_map->merge = 1;
 127                }
 128        }
 129        ref_remove_duplicates(ref_map);
 130
 131        return ref_map;
 132}
 133
 134static int s_update_ref(const char *action,
 135                        struct ref *ref,
 136                        int check_old)
 137{
 138        char msg[1024];
 139        char *rla = getenv("GIT_REFLOG_ACTION");
 140        static struct ref_lock *lock;
 141
 142        if (!rla)
 143                rla = default_rla;
 144        snprintf(msg, sizeof(msg), "%s: %s", rla, action);
 145        lock = lock_any_ref_for_update(ref->name,
 146                                       check_old ? ref->old_sha1 : NULL, 0);
 147        if (!lock)
 148                return 1;
 149        if (write_ref_sha1(lock, ref->new_sha1, msg) < 0)
 150                return 1;
 151        return 0;
 152}
 153
 154#define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3)
 155
 156static int update_local_ref(struct ref *ref,
 157                            const char *remote,
 158                            int verbose,
 159                            char *display)
 160{
 161        struct commit *current = NULL, *updated;
 162        enum object_type type;
 163        struct branch *current_branch = branch_get(NULL);
 164        const char *pretty_ref = ref->name + (
 165                !prefixcmp(ref->name, "refs/heads/") ? 11 :
 166                !prefixcmp(ref->name, "refs/tags/") ? 10 :
 167                !prefixcmp(ref->name, "refs/remotes/") ? 13 :
 168                0);
 169
 170        *display = 0;
 171        type = sha1_object_info(ref->new_sha1, NULL);
 172        if (type < 0)
 173                die("object %s not found", sha1_to_hex(ref->new_sha1));
 174
 175        if (!*ref->name) {
 176                /* Not storing */
 177                if (verbose)
 178                        sprintf(display, "* branch %s -> FETCH_HEAD", remote);
 179                return 0;
 180        }
 181
 182        if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
 183                if (verbose)
 184                        sprintf(display, "= %-*s %s -> %s", SUMMARY_WIDTH,
 185                                "[up to date]", remote, pretty_ref);
 186                return 0;
 187        }
 188
 189        if (current_branch &&
 190            !strcmp(ref->name, current_branch->name) &&
 191            !(update_head_ok || is_bare_repository()) &&
 192            !is_null_sha1(ref->old_sha1)) {
 193                /*
 194                 * If this is the head, and it's not okay to update
 195                 * the head, and the old value of the head isn't empty...
 196                 */
 197                sprintf(display, "! %-*s %s -> %s  (can't  fetch in current branch)",
 198                        SUMMARY_WIDTH, "[rejected]", remote, pretty_ref);
 199                return 1;
 200        }
 201
 202        if (!is_null_sha1(ref->old_sha1) &&
 203            !prefixcmp(ref->name, "refs/tags/")) {
 204                sprintf(display, "- %-*s %s -> %s",
 205                        SUMMARY_WIDTH, "[tag update]", remote, pretty_ref);
 206                return s_update_ref("updating tag", ref, 0);
 207        }
 208
 209        current = lookup_commit_reference_gently(ref->old_sha1, 1);
 210        updated = lookup_commit_reference_gently(ref->new_sha1, 1);
 211        if (!current || !updated) {
 212                const char *msg;
 213                const char *what;
 214                if (!strncmp(ref->name, "refs/tags/", 10)) {
 215                        msg = "storing tag";
 216                        what = "[new tag]";
 217                }
 218                else {
 219                        msg = "storing head";
 220                        what = "[new branch]";
 221                }
 222
 223                sprintf(display, "* %-*s %s -> %s",
 224                        SUMMARY_WIDTH, what, remote, pretty_ref);
 225                return s_update_ref(msg, ref, 0);
 226        }
 227
 228        if (in_merge_bases(current, &updated, 1)) {
 229                char quickref[83];
 230                strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 231                strcat(quickref, "..");
 232                strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 233                sprintf(display, "  %-*s %s -> %s  (fast forward)",
 234                        SUMMARY_WIDTH, quickref, remote, pretty_ref);
 235                return s_update_ref("fast forward", ref, 1);
 236        } else if (force || ref->force) {
 237                char quickref[84];
 238                strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 239                strcat(quickref, "...");
 240                strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 241                sprintf(display, "+ %-*s %s -> %s  (forced update)",
 242                        SUMMARY_WIDTH, quickref, remote, pretty_ref);
 243                return s_update_ref("forced-update", ref, 1);
 244        } else {
 245                sprintf(display, "! %-*s %s -> %s  (non fast forward)",
 246                        SUMMARY_WIDTH, "[rejected]", remote, pretty_ref);
 247                return 1;
 248        }
 249}
 250
 251static void store_updated_refs(const char *url, struct ref *ref_map)
 252{
 253        FILE *fp;
 254        struct commit *commit;
 255        int url_len, i, note_len, shown_url = 0;
 256        char note[1024];
 257        const char *what, *kind;
 258        struct ref *rm;
 259
 260        fp = fopen(git_path("FETCH_HEAD"), "a");
 261        for (rm = ref_map; rm; rm = rm->next) {
 262                struct ref *ref = NULL;
 263
 264                if (rm->peer_ref) {
 265                        ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
 266                        strcpy(ref->name, rm->peer_ref->name);
 267                        hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
 268                        hashcpy(ref->new_sha1, rm->old_sha1);
 269                        ref->force = rm->peer_ref->force;
 270                }
 271
 272                commit = lookup_commit_reference_gently(rm->old_sha1, 1);
 273                if (!commit)
 274                        rm->merge = 0;
 275
 276                if (!strcmp(rm->name, "HEAD")) {
 277                        kind = "";
 278                        what = "";
 279                }
 280                else if (!prefixcmp(rm->name, "refs/heads/")) {
 281                        kind = "branch";
 282                        what = rm->name + 11;
 283                }
 284                else if (!prefixcmp(rm->name, "refs/tags/")) {
 285                        kind = "tag";
 286                        what = rm->name + 10;
 287                }
 288                else if (!prefixcmp(rm->name, "refs/remotes/")) {
 289                        kind = "remote branch";
 290                        what = rm->name + 13;
 291                }
 292                else {
 293                        kind = "";
 294                        what = rm->name;
 295                }
 296
 297                url_len = strlen(url);
 298                for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 299                        ;
 300                url_len = i + 1;
 301                if (4 < i && !strncmp(".git", url + i - 3, 4))
 302                        url_len = i - 3;
 303
 304                note_len = 0;
 305                if (*what) {
 306                        if (*kind)
 307                                note_len += sprintf(note + note_len, "%s ",
 308                                                    kind);
 309                        note_len += sprintf(note + note_len, "'%s' of ", what);
 310                }
 311                note_len += sprintf(note + note_len, "%.*s", url_len, url);
 312                fprintf(fp, "%s\t%s\t%s\n",
 313                        sha1_to_hex(commit ? commit->object.sha1 :
 314                                    rm->old_sha1),
 315                        rm->merge ? "" : "not-for-merge",
 316                        note);
 317
 318                if (ref) {
 319                        update_local_ref(ref, what, verbose, note);
 320                        if (*note) {
 321                                if (!shown_url) {
 322                                        fprintf(stderr, "From %.*s\n",
 323                                                        url_len, url);
 324                                        shown_url = 1;
 325                                }
 326                                fprintf(stderr, " %s\n", note);
 327                        }
 328                }
 329        }
 330        fclose(fp);
 331}
 332
 333static int fetch_refs(struct transport *transport, struct ref *ref_map)
 334{
 335        int ret = transport_fetch_refs(transport, ref_map);
 336        if (!ret)
 337                store_updated_refs(transport->url, ref_map);
 338        transport_unlock_pack(transport);
 339        return ret;
 340}
 341
 342static int add_existing(const char *refname, const unsigned char *sha1,
 343                        int flag, void *cbdata)
 344{
 345        struct path_list *list = (struct path_list *)cbdata;
 346        path_list_insert(refname, list);
 347        return 0;
 348}
 349
 350static struct ref *find_non_local_tags(struct transport *transport,
 351                                       struct ref *fetch_map)
 352{
 353        static struct path_list existing_refs = { NULL, 0, 0, 0 };
 354        struct path_list new_refs = { NULL, 0, 0, 1 };
 355        char *ref_name;
 356        int ref_name_len;
 357        const unsigned char *ref_sha1;
 358        const struct ref *tag_ref;
 359        struct ref *rm = NULL;
 360        struct ref *ref_map = NULL;
 361        struct ref **tail = &ref_map;
 362        const struct ref *ref;
 363
 364        for_each_ref(add_existing, &existing_refs);
 365        for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
 366                if (prefixcmp(ref->name, "refs/tags"))
 367                        continue;
 368
 369                ref_name = xstrdup(ref->name);
 370                ref_name_len = strlen(ref_name);
 371                ref_sha1 = ref->old_sha1;
 372
 373                if (!strcmp(ref_name + ref_name_len - 3, "^{}")) {
 374                        ref_name[ref_name_len - 3] = 0;
 375                        tag_ref = transport_get_remote_refs(transport);
 376                        while (tag_ref) {
 377                                if (!strcmp(tag_ref->name, ref_name)) {
 378                                        ref_sha1 = tag_ref->old_sha1;
 379                                        break;
 380                                }
 381                                tag_ref = tag_ref->next;
 382                        }
 383                }
 384
 385                if (!path_list_has_path(&existing_refs, ref_name) &&
 386                    !path_list_has_path(&new_refs, ref_name) &&
 387                    lookup_object(ref->old_sha1)) {
 388                        path_list_insert(ref_name, &new_refs);
 389
 390                        rm = alloc_ref(strlen(ref_name) + 1);
 391                        strcpy(rm->name, ref_name);
 392                        rm->peer_ref = alloc_ref(strlen(ref_name) + 1);
 393                        strcpy(rm->peer_ref->name, ref_name);
 394                        hashcpy(rm->old_sha1, ref_sha1);
 395
 396                        *tail = rm;
 397                        tail = &rm->next;
 398                }
 399                free(ref_name);
 400        }
 401
 402        return ref_map;
 403}
 404
 405static int do_fetch(struct transport *transport,
 406                    struct refspec *refs, int ref_count)
 407{
 408        struct ref *ref_map, *fetch_map;
 409        struct ref *rm;
 410        int autotags = (transport->remote->fetch_tags == 1);
 411        if (transport->remote->fetch_tags == 2 && !no_tags)
 412                tags = 1;
 413        if (transport->remote->fetch_tags == -1)
 414                no_tags = 1;
 415
 416        if (!transport->get_refs_list || !transport->fetch)
 417                die("Don't know how to fetch from %s", transport->url);
 418
 419        /* if not appending, truncate FETCH_HEAD */
 420        if (!append)
 421                fclose(fopen(git_path("FETCH_HEAD"), "w"));
 422
 423        ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
 424
 425        for (rm = ref_map; rm; rm = rm->next) {
 426                if (rm->peer_ref)
 427                        read_ref(rm->peer_ref->name, rm->peer_ref->old_sha1);
 428        }
 429
 430        if (fetch_refs(transport, ref_map)) {
 431                free_refs(ref_map);
 432                return 1;
 433        }
 434
 435        fetch_map = ref_map;
 436
 437        /* if neither --no-tags nor --tags was specified, do automated tag
 438         * following ... */
 439        if (!(tags || no_tags) && autotags) {
 440                ref_map = find_non_local_tags(transport, fetch_map);
 441                if (ref_map) {
 442                        transport_set_option(transport, TRANS_OPT_DEPTH, "0");
 443                        fetch_refs(transport, ref_map);
 444                }
 445                free_refs(ref_map);
 446        }
 447
 448        free_refs(fetch_map);
 449
 450        return 0;
 451}
 452
 453static void set_option(const char *name, const char *value)
 454{
 455        int r = transport_set_option(transport, name, value);
 456        if (r < 0)
 457                die("Option \"%s\" value \"%s\" is not valid for %s\n",
 458                        name, value, transport->url);
 459        if (r > 0)
 460                warning("Option \"%s\" is ignored for %s\n",
 461                        name, transport->url);
 462}
 463
 464int cmd_fetch(int argc, const char **argv, const char *prefix)
 465{
 466        struct remote *remote;
 467        int i, j, rla_offset;
 468        static const char **refs = NULL;
 469        int ref_nr = 0;
 470        int cmd_len = 0;
 471        const char *depth = NULL, *upload_pack = NULL;
 472        int keep = 0;
 473
 474        for (i = 1; i < argc; i++) {
 475                const char *arg = argv[i];
 476                cmd_len += strlen(arg);
 477
 478                if (arg[0] != '-')
 479                        break;
 480                if (!strcmp(arg, "--append") || !strcmp(arg, "-a")) {
 481                        append = 1;
 482                        continue;
 483                }
 484                if (!prefixcmp(arg, "--upload-pack=")) {
 485                        upload_pack = arg + 14;
 486                        continue;
 487                }
 488                if (!strcmp(arg, "--upload-pack")) {
 489                        i++;
 490                        if (i == argc)
 491                                usage(fetch_usage);
 492                        upload_pack = argv[i];
 493                        continue;
 494                }
 495                if (!strcmp(arg, "--force") || !strcmp(arg, "-f")) {
 496                        force = 1;
 497                        continue;
 498                }
 499                if (!strcmp(arg, "--no-tags")) {
 500                        no_tags = 1;
 501                        continue;
 502                }
 503                if (!strcmp(arg, "--tags") || !strcmp(arg, "-t")) {
 504                        tags = 1;
 505                        continue;
 506                }
 507                if (!strcmp(arg, "--keep") || !strcmp(arg, "-k")) {
 508                        keep = 1;
 509                        continue;
 510                }
 511                if (!strcmp(arg, "--update-head-ok") || !strcmp(arg, "-u")) {
 512                        update_head_ok = 1;
 513                        continue;
 514                }
 515                if (!prefixcmp(arg, "--depth=")) {
 516                        depth = arg + 8;
 517                        continue;
 518                }
 519                if (!strcmp(arg, "--depth")) {
 520                        i++;
 521                        if (i == argc)
 522                                usage(fetch_usage);
 523                        depth = argv[i];
 524                        continue;
 525                }
 526                if (!strcmp(arg, "--quiet") || !strcmp(arg, "-q")) {
 527                        quiet = 1;
 528                        continue;
 529                }
 530                if (!strcmp(arg, "--verbose") || !strcmp(arg, "-v")) {
 531                        verbose++;
 532                        continue;
 533                }
 534                usage(fetch_usage);
 535        }
 536
 537        for (j = i; j < argc; j++)
 538                cmd_len += strlen(argv[j]);
 539
 540        default_rla = xmalloc(cmd_len + 5 + argc + 1);
 541        sprintf(default_rla, "fetch");
 542        rla_offset = strlen(default_rla);
 543        for (j = 1; j < argc; j++) {
 544                sprintf(default_rla + rla_offset, " %s", argv[j]);
 545                rla_offset += strlen(argv[j]) + 1;
 546        }
 547
 548        if (i == argc)
 549                remote = remote_get(NULL);
 550        else
 551                remote = remote_get(argv[i++]);
 552
 553        transport = transport_get(remote, remote->url[0]);
 554        if (verbose >= 2)
 555                transport->verbose = 1;
 556        if (quiet)
 557                transport->verbose = -1;
 558        if (upload_pack)
 559                set_option(TRANS_OPT_UPLOADPACK, upload_pack);
 560        if (keep)
 561                set_option(TRANS_OPT_KEEP, "yes");
 562        if (depth)
 563                set_option(TRANS_OPT_DEPTH, depth);
 564
 565        if (!transport->url)
 566                die("Where do you want to fetch from today?");
 567
 568        if (i < argc) {
 569                int j = 0;
 570                refs = xcalloc(argc - i + 1, sizeof(const char *));
 571                while (i < argc) {
 572                        if (!strcmp(argv[i], "tag")) {
 573                                char *ref;
 574                                i++;
 575                                ref = xmalloc(strlen(argv[i]) * 2 + 22);
 576                                strcpy(ref, "refs/tags/");
 577                                strcat(ref, argv[i]);
 578                                strcat(ref, ":refs/tags/");
 579                                strcat(ref, argv[i]);
 580                                refs[j++] = ref;
 581                        } else
 582                                refs[j++] = argv[i];
 583                        i++;
 584                }
 585                refs[j] = NULL;
 586                ref_nr = j;
 587        }
 588
 589        signal(SIGINT, unlock_pack_on_signal);
 590        atexit(unlock_pack);
 591        return do_fetch(transport, parse_ref_spec(ref_nr, refs), ref_nr);
 592}