builtin / fetch.con commit Merge branch 'js/import-tars-hardlinks' into maint (5e09f1d)
   1/*
   2 * "git fetch"
   3 */
   4#include "cache.h"
   5#include "refs.h"
   6#include "commit.h"
   7#include "builtin.h"
   8#include "string-list.h"
   9#include "remote.h"
  10#include "transport.h"
  11#include "run-command.h"
  12#include "parse-options.h"
  13#include "sigchain.h"
  14#include "submodule-config.h"
  15#include "submodule.h"
  16#include "connected.h"
  17#include "argv-array.h"
  18
  19static const char * const builtin_fetch_usage[] = {
  20        N_("git fetch [<options>] [<repository> [<refspec>...]]"),
  21        N_("git fetch [<options>] <group>"),
  22        N_("git fetch --multiple [<options>] [(<repository> | <group>)...]"),
  23        N_("git fetch --all [<options>]"),
  24        NULL
  25};
  26
  27enum {
  28        TAGS_UNSET = 0,
  29        TAGS_DEFAULT = 1,
  30        TAGS_SET = 2
  31};
  32
  33static int fetch_prune_config = -1; /* unspecified */
  34static int prune = -1; /* unspecified */
  35#define PRUNE_BY_DEFAULT 0 /* do we prune by default? */
  36
  37static int all, append, dry_run, force, keep, multiple, update_head_ok, verbosity;
  38static int progress = -1, recurse_submodules = RECURSE_SUBMODULES_DEFAULT;
  39static int tags = TAGS_DEFAULT, unshallow, update_shallow;
  40static int max_children = -1;
  41static enum transport_family family;
  42static const char *depth;
  43static const char *upload_pack;
  44static struct strbuf default_rla = STRBUF_INIT;
  45static struct transport *gtransport;
  46static struct transport *gsecondary;
  47static const char *submodule_prefix = "";
  48static const char *recurse_submodules_default;
  49static int shown_url = 0;
  50static int refmap_alloc, refmap_nr;
  51static const char **refmap_array;
  52
  53static int option_parse_recurse_submodules(const struct option *opt,
  54                                   const char *arg, int unset)
  55{
  56        if (unset) {
  57                recurse_submodules = RECURSE_SUBMODULES_OFF;
  58        } else {
  59                if (arg)
  60                        recurse_submodules = parse_fetch_recurse_submodules_arg(opt->long_name, arg);
  61                else
  62                        recurse_submodules = RECURSE_SUBMODULES_ON;
  63        }
  64        return 0;
  65}
  66
  67static int git_fetch_config(const char *k, const char *v, void *cb)
  68{
  69        if (!strcmp(k, "fetch.prune")) {
  70                fetch_prune_config = git_config_bool(k, v);
  71                return 0;
  72        }
  73        return git_default_config(k, v, cb);
  74}
  75
  76static int parse_refmap_arg(const struct option *opt, const char *arg, int unset)
  77{
  78        ALLOC_GROW(refmap_array, refmap_nr + 1, refmap_alloc);
  79
  80        /*
  81         * "git fetch --refmap='' origin foo"
  82         * can be used to tell the command not to store anywhere
  83         */
  84        if (*arg)
  85                refmap_array[refmap_nr++] = arg;
  86        return 0;
  87}
  88
  89static struct option builtin_fetch_options[] = {
  90        OPT__VERBOSITY(&verbosity),
  91        OPT_BOOL(0, "all", &all,
  92                 N_("fetch from all remotes")),
  93        OPT_BOOL('a', "append", &append,
  94                 N_("append to .git/FETCH_HEAD instead of overwriting")),
  95        OPT_STRING(0, "upload-pack", &upload_pack, N_("path"),
  96                   N_("path to upload pack on remote end")),
  97        OPT__FORCE(&force, N_("force overwrite of local branch")),
  98        OPT_BOOL('m', "multiple", &multiple,
  99                 N_("fetch from multiple remotes")),
 100        OPT_SET_INT('t', "tags", &tags,
 101                    N_("fetch all tags and associated objects"), TAGS_SET),
 102        OPT_SET_INT('n', NULL, &tags,
 103                    N_("do not fetch all tags (--no-tags)"), TAGS_UNSET),
 104        OPT_INTEGER('j', "jobs", &max_children,
 105                    N_("number of submodules fetched in parallel")),
 106        OPT_BOOL('p', "prune", &prune,
 107                 N_("prune remote-tracking branches no longer on remote")),
 108        { OPTION_CALLBACK, 0, "recurse-submodules", NULL, N_("on-demand"),
 109                    N_("control recursive fetching of submodules"),
 110                    PARSE_OPT_OPTARG, option_parse_recurse_submodules },
 111        OPT_BOOL(0, "dry-run", &dry_run,
 112                 N_("dry run")),
 113        OPT_BOOL('k', "keep", &keep, N_("keep downloaded pack")),
 114        OPT_BOOL('u', "update-head-ok", &update_head_ok,
 115                    N_("allow updating of HEAD ref")),
 116        OPT_BOOL(0, "progress", &progress, N_("force progress reporting")),
 117        OPT_STRING(0, "depth", &depth, N_("depth"),
 118                   N_("deepen history of shallow clone")),
 119        { OPTION_SET_INT, 0, "unshallow", &unshallow, NULL,
 120                   N_("convert to a complete repository"),
 121                   PARSE_OPT_NONEG | PARSE_OPT_NOARG, NULL, 1 },
 122        { OPTION_STRING, 0, "submodule-prefix", &submodule_prefix, N_("dir"),
 123                   N_("prepend this to submodule path output"), PARSE_OPT_HIDDEN },
 124        { OPTION_STRING, 0, "recurse-submodules-default",
 125                   &recurse_submodules_default, NULL,
 126                   N_("default mode for recursion"), PARSE_OPT_HIDDEN },
 127        OPT_BOOL(0, "update-shallow", &update_shallow,
 128                 N_("accept refs that update .git/shallow")),
 129        { OPTION_CALLBACK, 0, "refmap", NULL, N_("refmap"),
 130          N_("specify fetch refmap"), PARSE_OPT_NONEG, parse_refmap_arg },
 131        OPT_SET_INT('4', "ipv4", &family, N_("use IPv4 addresses only"),
 132                        TRANSPORT_FAMILY_IPV4),
 133        OPT_SET_INT('6', "ipv6", &family, N_("use IPv6 addresses only"),
 134                        TRANSPORT_FAMILY_IPV6),
 135        OPT_END()
 136};
 137
 138static void unlock_pack(void)
 139{
 140        if (gtransport)
 141                transport_unlock_pack(gtransport);
 142        if (gsecondary)
 143                transport_unlock_pack(gsecondary);
 144}
 145
 146static void unlock_pack_on_signal(int signo)
 147{
 148        unlock_pack();
 149        sigchain_pop(signo);
 150        raise(signo);
 151}
 152
 153static void add_merge_config(struct ref **head,
 154                           const struct ref *remote_refs,
 155                           struct branch *branch,
 156                           struct ref ***tail)
 157{
 158        int i;
 159
 160        for (i = 0; i < branch->merge_nr; i++) {
 161                struct ref *rm, **old_tail = *tail;
 162                struct refspec refspec;
 163
 164                for (rm = *head; rm; rm = rm->next) {
 165                        if (branch_merge_matches(branch, i, rm->name)) {
 166                                rm->fetch_head_status = FETCH_HEAD_MERGE;
 167                                break;
 168                        }
 169                }
 170                if (rm)
 171                        continue;
 172
 173                /*
 174                 * Not fetched to a remote-tracking branch?  We need to fetch
 175                 * it anyway to allow this branch's "branch.$name.merge"
 176                 * to be honored by 'git pull', but we do not have to
 177                 * fail if branch.$name.merge is misconfigured to point
 178                 * at a nonexisting branch.  If we were indeed called by
 179                 * 'git pull', it will notice the misconfiguration because
 180                 * there is no entry in the resulting FETCH_HEAD marked
 181                 * for merging.
 182                 */
 183                memset(&refspec, 0, sizeof(refspec));
 184                refspec.src = branch->merge[i]->src;
 185                get_fetch_map(remote_refs, &refspec, tail, 1);
 186                for (rm = *old_tail; rm; rm = rm->next)
 187                        rm->fetch_head_status = FETCH_HEAD_MERGE;
 188        }
 189}
 190
 191static int add_existing(const char *refname, const struct object_id *oid,
 192                        int flag, void *cbdata)
 193{
 194        struct string_list *list = (struct string_list *)cbdata;
 195        struct string_list_item *item = string_list_insert(list, refname);
 196        struct object_id *old_oid = xmalloc(sizeof(*old_oid));
 197
 198        oidcpy(old_oid, oid);
 199        item->util = old_oid;
 200        return 0;
 201}
 202
 203static int will_fetch(struct ref **head, const unsigned char *sha1)
 204{
 205        struct ref *rm = *head;
 206        while (rm) {
 207                if (!hashcmp(rm->old_oid.hash, sha1))
 208                        return 1;
 209                rm = rm->next;
 210        }
 211        return 0;
 212}
 213
 214static void find_non_local_tags(struct transport *transport,
 215                        struct ref **head,
 216                        struct ref ***tail)
 217{
 218        struct string_list existing_refs = STRING_LIST_INIT_DUP;
 219        struct string_list remote_refs = STRING_LIST_INIT_NODUP;
 220        const struct ref *ref;
 221        struct string_list_item *item = NULL;
 222
 223        for_each_ref(add_existing, &existing_refs);
 224        for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
 225                if (!starts_with(ref->name, "refs/tags/"))
 226                        continue;
 227
 228                /*
 229                 * The peeled ref always follows the matching base
 230                 * ref, so if we see a peeled ref that we don't want
 231                 * to fetch then we can mark the ref entry in the list
 232                 * as one to ignore by setting util to NULL.
 233                 */
 234                if (ends_with(ref->name, "^{}")) {
 235                        if (item && !has_object_file(&ref->old_oid) &&
 236                            !will_fetch(head, ref->old_oid.hash) &&
 237                            !has_sha1_file(item->util) &&
 238                            !will_fetch(head, item->util))
 239                                item->util = NULL;
 240                        item = NULL;
 241                        continue;
 242                }
 243
 244                /*
 245                 * If item is non-NULL here, then we previously saw a
 246                 * ref not followed by a peeled reference, so we need
 247                 * to check if it is a lightweight tag that we want to
 248                 * fetch.
 249                 */
 250                if (item && !has_sha1_file(item->util) &&
 251                    !will_fetch(head, item->util))
 252                        item->util = NULL;
 253
 254                item = NULL;
 255
 256                /* skip duplicates and refs that we already have */
 257                if (string_list_has_string(&remote_refs, ref->name) ||
 258                    string_list_has_string(&existing_refs, ref->name))
 259                        continue;
 260
 261                item = string_list_insert(&remote_refs, ref->name);
 262                item->util = (void *)&ref->old_oid;
 263        }
 264        string_list_clear(&existing_refs, 1);
 265
 266        /*
 267         * We may have a final lightweight tag that needs to be
 268         * checked to see if it needs fetching.
 269         */
 270        if (item && !has_sha1_file(item->util) &&
 271            !will_fetch(head, item->util))
 272                item->util = NULL;
 273
 274        /*
 275         * For all the tags in the remote_refs string list,
 276         * add them to the list of refs to be fetched
 277         */
 278        for_each_string_list_item(item, &remote_refs) {
 279                /* Unless we have already decided to ignore this item... */
 280                if (item->util)
 281                {
 282                        struct ref *rm = alloc_ref(item->string);
 283                        rm->peer_ref = alloc_ref(item->string);
 284                        oidcpy(&rm->old_oid, item->util);
 285                        **tail = rm;
 286                        *tail = &rm->next;
 287                }
 288        }
 289
 290        string_list_clear(&remote_refs, 0);
 291}
 292
 293static struct ref *get_ref_map(struct transport *transport,
 294                               struct refspec *refspecs, int refspec_count,
 295                               int tags, int *autotags)
 296{
 297        int i;
 298        struct ref *rm;
 299        struct ref *ref_map = NULL;
 300        struct ref **tail = &ref_map;
 301
 302        /* opportunistically-updated references: */
 303        struct ref *orefs = NULL, **oref_tail = &orefs;
 304
 305        const struct ref *remote_refs = transport_get_remote_refs(transport);
 306
 307        if (refspec_count) {
 308                struct refspec *fetch_refspec;
 309                int fetch_refspec_nr;
 310
 311                for (i = 0; i < refspec_count; i++) {
 312                        get_fetch_map(remote_refs, &refspecs[i], &tail, 0);
 313                        if (refspecs[i].dst && refspecs[i].dst[0])
 314                                *autotags = 1;
 315                }
 316                /* Merge everything on the command line (but not --tags) */
 317                for (rm = ref_map; rm; rm = rm->next)
 318                        rm->fetch_head_status = FETCH_HEAD_MERGE;
 319
 320                /*
 321                 * For any refs that we happen to be fetching via
 322                 * command-line arguments, the destination ref might
 323                 * have been missing or have been different than the
 324                 * remote-tracking ref that would be derived from the
 325                 * configured refspec.  In these cases, we want to
 326                 * take the opportunity to update their configured
 327                 * remote-tracking reference.  However, we do not want
 328                 * to mention these entries in FETCH_HEAD at all, as
 329                 * they would simply be duplicates of existing
 330                 * entries, so we set them FETCH_HEAD_IGNORE below.
 331                 *
 332                 * We compute these entries now, based only on the
 333                 * refspecs specified on the command line.  But we add
 334                 * them to the list following the refspecs resulting
 335                 * from the tags option so that one of the latter,
 336                 * which has FETCH_HEAD_NOT_FOR_MERGE, is not removed
 337                 * by ref_remove_duplicates() in favor of one of these
 338                 * opportunistic entries with FETCH_HEAD_IGNORE.
 339                 */
 340                if (refmap_array) {
 341                        fetch_refspec = parse_fetch_refspec(refmap_nr, refmap_array);
 342                        fetch_refspec_nr = refmap_nr;
 343                } else {
 344                        fetch_refspec = transport->remote->fetch;
 345                        fetch_refspec_nr = transport->remote->fetch_refspec_nr;
 346                }
 347
 348                for (i = 0; i < fetch_refspec_nr; i++)
 349                        get_fetch_map(ref_map, &fetch_refspec[i], &oref_tail, 1);
 350
 351                if (tags == TAGS_SET)
 352                        get_fetch_map(remote_refs, tag_refspec, &tail, 0);
 353        } else if (refmap_array) {
 354                die("--refmap option is only meaningful with command-line refspec(s).");
 355        } else {
 356                /* Use the defaults */
 357                struct remote *remote = transport->remote;
 358                struct branch *branch = branch_get(NULL);
 359                int has_merge = branch_has_merge_config(branch);
 360                if (remote &&
 361                    (remote->fetch_refspec_nr ||
 362                     /* Note: has_merge implies non-NULL branch->remote_name */
 363                     (has_merge && !strcmp(branch->remote_name, remote->name)))) {
 364                        for (i = 0; i < remote->fetch_refspec_nr; i++) {
 365                                get_fetch_map(remote_refs, &remote->fetch[i], &tail, 0);
 366                                if (remote->fetch[i].dst &&
 367                                    remote->fetch[i].dst[0])
 368                                        *autotags = 1;
 369                                if (!i && !has_merge && ref_map &&
 370                                    !remote->fetch[0].pattern)
 371                                        ref_map->fetch_head_status = FETCH_HEAD_MERGE;
 372                        }
 373                        /*
 374                         * if the remote we're fetching from is the same
 375                         * as given in branch.<name>.remote, we add the
 376                         * ref given in branch.<name>.merge, too.
 377                         *
 378                         * Note: has_merge implies non-NULL branch->remote_name
 379                         */
 380                        if (has_merge &&
 381                            !strcmp(branch->remote_name, remote->name))
 382                                add_merge_config(&ref_map, remote_refs, branch, &tail);
 383                } else {
 384                        ref_map = get_remote_ref(remote_refs, "HEAD");
 385                        if (!ref_map)
 386                                die(_("Couldn't find remote ref HEAD"));
 387                        ref_map->fetch_head_status = FETCH_HEAD_MERGE;
 388                        tail = &ref_map->next;
 389                }
 390        }
 391
 392        if (tags == TAGS_SET)
 393                /* also fetch all tags */
 394                get_fetch_map(remote_refs, tag_refspec, &tail, 0);
 395        else if (tags == TAGS_DEFAULT && *autotags)
 396                find_non_local_tags(transport, &ref_map, &tail);
 397
 398        /* Now append any refs to be updated opportunistically: */
 399        *tail = orefs;
 400        for (rm = orefs; rm; rm = rm->next) {
 401                rm->fetch_head_status = FETCH_HEAD_IGNORE;
 402                tail = &rm->next;
 403        }
 404
 405        return ref_remove_duplicates(ref_map);
 406}
 407
 408#define STORE_REF_ERROR_OTHER 1
 409#define STORE_REF_ERROR_DF_CONFLICT 2
 410
 411static int s_update_ref(const char *action,
 412                        struct ref *ref,
 413                        int check_old)
 414{
 415        char msg[1024];
 416        char *rla = getenv("GIT_REFLOG_ACTION");
 417        struct ref_transaction *transaction;
 418        struct strbuf err = STRBUF_INIT;
 419        int ret, df_conflict = 0;
 420
 421        if (dry_run)
 422                return 0;
 423        if (!rla)
 424                rla = default_rla.buf;
 425        snprintf(msg, sizeof(msg), "%s: %s", rla, action);
 426
 427        transaction = ref_transaction_begin(&err);
 428        if (!transaction ||
 429            ref_transaction_update(transaction, ref->name,
 430                                   ref->new_oid.hash,
 431                                   check_old ? ref->old_oid.hash : NULL,
 432                                   0, msg, &err))
 433                goto fail;
 434
 435        ret = ref_transaction_commit(transaction, &err);
 436        if (ret) {
 437                df_conflict = (ret == TRANSACTION_NAME_CONFLICT);
 438                goto fail;
 439        }
 440
 441        ref_transaction_free(transaction);
 442        strbuf_release(&err);
 443        return 0;
 444fail:
 445        ref_transaction_free(transaction);
 446        error("%s", err.buf);
 447        strbuf_release(&err);
 448        return df_conflict ? STORE_REF_ERROR_DF_CONFLICT
 449                           : STORE_REF_ERROR_OTHER;
 450}
 451
 452#define REFCOL_WIDTH  10
 453
 454static int update_local_ref(struct ref *ref,
 455                            const char *remote,
 456                            const struct ref *remote_ref,
 457                            struct strbuf *display)
 458{
 459        struct commit *current = NULL, *updated;
 460        enum object_type type;
 461        struct branch *current_branch = branch_get(NULL);
 462        const char *pretty_ref = prettify_refname(ref->name);
 463
 464        type = sha1_object_info(ref->new_oid.hash, NULL);
 465        if (type < 0)
 466                die(_("object %s not found"), oid_to_hex(&ref->new_oid));
 467
 468        if (!oidcmp(&ref->old_oid, &ref->new_oid)) {
 469                if (verbosity > 0)
 470                        strbuf_addf(display, "= %-*s %-*s -> %s",
 471                                    TRANSPORT_SUMMARY(_("[up to date]")),
 472                                    REFCOL_WIDTH, remote, pretty_ref);
 473                return 0;
 474        }
 475
 476        if (current_branch &&
 477            !strcmp(ref->name, current_branch->name) &&
 478            !(update_head_ok || is_bare_repository()) &&
 479            !is_null_oid(&ref->old_oid)) {
 480                /*
 481                 * If this is the head, and it's not okay to update
 482                 * the head, and the old value of the head isn't empty...
 483                 */
 484                strbuf_addf(display,
 485                            _("! %-*s %-*s -> %s  (can't fetch in current branch)"),
 486                            TRANSPORT_SUMMARY(_("[rejected]")),
 487                            REFCOL_WIDTH, remote, pretty_ref);
 488                return 1;
 489        }
 490
 491        if (!is_null_oid(&ref->old_oid) &&
 492            starts_with(ref->name, "refs/tags/")) {
 493                int r;
 494                r = s_update_ref("updating tag", ref, 0);
 495                strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 496                            r ? '!' : '-',
 497                            TRANSPORT_SUMMARY(_("[tag update]")),
 498                            REFCOL_WIDTH, remote, pretty_ref,
 499                            r ? _("  (unable to update local ref)") : "");
 500                return r;
 501        }
 502
 503        current = lookup_commit_reference_gently(ref->old_oid.hash, 1);
 504        updated = lookup_commit_reference_gently(ref->new_oid.hash, 1);
 505        if (!current || !updated) {
 506                const char *msg;
 507                const char *what;
 508                int r;
 509                /*
 510                 * Nicely describe the new ref we're fetching.
 511                 * Base this on the remote's ref name, as it's
 512                 * more likely to follow a standard layout.
 513                 */
 514                const char *name = remote_ref ? remote_ref->name : "";
 515                if (starts_with(name, "refs/tags/")) {
 516                        msg = "storing tag";
 517                        what = _("[new tag]");
 518                } else if (starts_with(name, "refs/heads/")) {
 519                        msg = "storing head";
 520                        what = _("[new branch]");
 521                } else {
 522                        msg = "storing ref";
 523                        what = _("[new ref]");
 524                }
 525
 526                if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 527                    (recurse_submodules != RECURSE_SUBMODULES_ON))
 528                        check_for_new_submodule_commits(ref->new_oid.hash);
 529                r = s_update_ref(msg, ref, 0);
 530                strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 531                            r ? '!' : '*',
 532                            TRANSPORT_SUMMARY(what),
 533                            REFCOL_WIDTH, remote, pretty_ref,
 534                            r ? _("  (unable to update local ref)") : "");
 535                return r;
 536        }
 537
 538        if (in_merge_bases(current, updated)) {
 539                struct strbuf quickref = STRBUF_INIT;
 540                int r;
 541                strbuf_add_unique_abbrev(&quickref, current->object.oid.hash, DEFAULT_ABBREV);
 542                strbuf_addstr(&quickref, "..");
 543                strbuf_add_unique_abbrev(&quickref, ref->new_oid.hash, DEFAULT_ABBREV);
 544                if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 545                    (recurse_submodules != RECURSE_SUBMODULES_ON))
 546                        check_for_new_submodule_commits(ref->new_oid.hash);
 547                r = s_update_ref("fast-forward", ref, 1);
 548                strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 549                            r ? '!' : ' ',
 550                            TRANSPORT_SUMMARY_WIDTH, quickref.buf,
 551                            REFCOL_WIDTH, remote, pretty_ref,
 552                            r ? _("  (unable to update local ref)") : "");
 553                strbuf_release(&quickref);
 554                return r;
 555        } else if (force || ref->force) {
 556                struct strbuf quickref = STRBUF_INIT;
 557                int r;
 558                strbuf_add_unique_abbrev(&quickref, current->object.oid.hash, DEFAULT_ABBREV);
 559                strbuf_addstr(&quickref, "...");
 560                strbuf_add_unique_abbrev(&quickref, ref->new_oid.hash, DEFAULT_ABBREV);
 561                if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 562                    (recurse_submodules != RECURSE_SUBMODULES_ON))
 563                        check_for_new_submodule_commits(ref->new_oid.hash);
 564                r = s_update_ref("forced-update", ref, 1);
 565                strbuf_addf(display, "%c %-*s %-*s -> %s  (%s)",
 566                            r ? '!' : '+',
 567                            TRANSPORT_SUMMARY_WIDTH, quickref.buf,
 568                            REFCOL_WIDTH, remote, pretty_ref,
 569                            r ? _("unable to update local ref") : _("forced update"));
 570                strbuf_release(&quickref);
 571                return r;
 572        } else {
 573                strbuf_addf(display, "! %-*s %-*s -> %s  %s",
 574                            TRANSPORT_SUMMARY(_("[rejected]")),
 575                            REFCOL_WIDTH, remote, pretty_ref,
 576                            _("(non-fast-forward)"));
 577                return 1;
 578        }
 579}
 580
 581static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
 582{
 583        struct ref **rm = cb_data;
 584        struct ref *ref = *rm;
 585
 586        while (ref && ref->status == REF_STATUS_REJECT_SHALLOW)
 587                ref = ref->next;
 588        if (!ref)
 589                return -1; /* end of the list */
 590        *rm = ref->next;
 591        hashcpy(sha1, ref->old_oid.hash);
 592        return 0;
 593}
 594
 595static int store_updated_refs(const char *raw_url, const char *remote_name,
 596                struct ref *ref_map)
 597{
 598        FILE *fp;
 599        struct commit *commit;
 600        int url_len, i, rc = 0;
 601        struct strbuf note = STRBUF_INIT;
 602        const char *what, *kind;
 603        struct ref *rm;
 604        char *url;
 605        const char *filename = dry_run ? "/dev/null" : git_path_fetch_head();
 606        int want_status;
 607
 608        fp = fopen(filename, "a");
 609        if (!fp)
 610                return error_errno(_("cannot open %s"), filename);
 611
 612        if (raw_url)
 613                url = transport_anonymize_url(raw_url);
 614        else
 615                url = xstrdup("foreign");
 616
 617        rm = ref_map;
 618        if (check_everything_connected(iterate_ref_map, 0, &rm)) {
 619                rc = error(_("%s did not send all necessary objects\n"), url);
 620                goto abort;
 621        }
 622
 623        /*
 624         * We do a pass for each fetch_head_status type in their enum order, so
 625         * merged entries are written before not-for-merge. That lets readers
 626         * use FETCH_HEAD as a refname to refer to the ref to be merged.
 627         */
 628        for (want_status = FETCH_HEAD_MERGE;
 629             want_status <= FETCH_HEAD_IGNORE;
 630             want_status++) {
 631                for (rm = ref_map; rm; rm = rm->next) {
 632                        struct ref *ref = NULL;
 633                        const char *merge_status_marker = "";
 634
 635                        if (rm->status == REF_STATUS_REJECT_SHALLOW) {
 636                                if (want_status == FETCH_HEAD_MERGE)
 637                                        warning(_("reject %s because shallow roots are not allowed to be updated"),
 638                                                rm->peer_ref ? rm->peer_ref->name : rm->name);
 639                                continue;
 640                        }
 641
 642                        commit = lookup_commit_reference_gently(rm->old_oid.hash, 1);
 643                        if (!commit)
 644                                rm->fetch_head_status = FETCH_HEAD_NOT_FOR_MERGE;
 645
 646                        if (rm->fetch_head_status != want_status)
 647                                continue;
 648
 649                        if (rm->peer_ref) {
 650                                ref = alloc_ref(rm->peer_ref->name);
 651                                oidcpy(&ref->old_oid, &rm->peer_ref->old_oid);
 652                                oidcpy(&ref->new_oid, &rm->old_oid);
 653                                ref->force = rm->peer_ref->force;
 654                        }
 655
 656
 657                        if (!strcmp(rm->name, "HEAD")) {
 658                                kind = "";
 659                                what = "";
 660                        }
 661                        else if (starts_with(rm->name, "refs/heads/")) {
 662                                kind = "branch";
 663                                what = rm->name + 11;
 664                        }
 665                        else if (starts_with(rm->name, "refs/tags/")) {
 666                                kind = "tag";
 667                                what = rm->name + 10;
 668                        }
 669                        else if (starts_with(rm->name, "refs/remotes/")) {
 670                                kind = "remote-tracking branch";
 671                                what = rm->name + 13;
 672                        }
 673                        else {
 674                                kind = "";
 675                                what = rm->name;
 676                        }
 677
 678                        url_len = strlen(url);
 679                        for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 680                                ;
 681                        url_len = i + 1;
 682                        if (4 < i && !strncmp(".git", url + i - 3, 4))
 683                                url_len = i - 3;
 684
 685                        strbuf_reset(&note);
 686                        if (*what) {
 687                                if (*kind)
 688                                        strbuf_addf(&note, "%s ", kind);
 689                                strbuf_addf(&note, "'%s' of ", what);
 690                        }
 691                        switch (rm->fetch_head_status) {
 692                        case FETCH_HEAD_NOT_FOR_MERGE:
 693                                merge_status_marker = "not-for-merge";
 694                                /* fall-through */
 695                        case FETCH_HEAD_MERGE:
 696                                fprintf(fp, "%s\t%s\t%s",
 697                                        oid_to_hex(&rm->old_oid),
 698                                        merge_status_marker,
 699                                        note.buf);
 700                                for (i = 0; i < url_len; ++i)
 701                                        if ('\n' == url[i])
 702                                                fputs("\\n", fp);
 703                                        else
 704                                                fputc(url[i], fp);
 705                                fputc('\n', fp);
 706                                break;
 707                        default:
 708                                /* do not write anything to FETCH_HEAD */
 709                                break;
 710                        }
 711
 712                        strbuf_reset(&note);
 713                        if (ref) {
 714                                rc |= update_local_ref(ref, what, rm, &note);
 715                                free(ref);
 716                        } else
 717                                strbuf_addf(&note, "* %-*s %-*s -> FETCH_HEAD",
 718                                            TRANSPORT_SUMMARY_WIDTH,
 719                                            *kind ? kind : "branch",
 720                                            REFCOL_WIDTH,
 721                                            *what ? what : "HEAD");
 722                        if (note.len) {
 723                                if (verbosity >= 0 && !shown_url) {
 724                                        fprintf(stderr, _("From %.*s\n"),
 725                                                        url_len, url);
 726                                        shown_url = 1;
 727                                }
 728                                if (verbosity >= 0)
 729                                        fprintf(stderr, " %s\n", note.buf);
 730                        }
 731                }
 732        }
 733
 734        if (rc & STORE_REF_ERROR_DF_CONFLICT)
 735                error(_("some local refs could not be updated; try running\n"
 736                      " 'git remote prune %s' to remove any old, conflicting "
 737                      "branches"), remote_name);
 738
 739 abort:
 740        strbuf_release(&note);
 741        free(url);
 742        fclose(fp);
 743        return rc;
 744}
 745
 746/*
 747 * We would want to bypass the object transfer altogether if
 748 * everything we are going to fetch already exists and is connected
 749 * locally.
 750 */
 751static int quickfetch(struct ref *ref_map)
 752{
 753        struct ref *rm = ref_map;
 754
 755        /*
 756         * If we are deepening a shallow clone we already have these
 757         * objects reachable.  Running rev-list here will return with
 758         * a good (0) exit status and we'll bypass the fetch that we
 759         * really need to perform.  Claiming failure now will ensure
 760         * we perform the network exchange to deepen our history.
 761         */
 762        if (depth)
 763                return -1;
 764        return check_everything_connected(iterate_ref_map, 1, &rm);
 765}
 766
 767static int fetch_refs(struct transport *transport, struct ref *ref_map)
 768{
 769        int ret = quickfetch(ref_map);
 770        if (ret)
 771                ret = transport_fetch_refs(transport, ref_map);
 772        if (!ret)
 773                ret |= store_updated_refs(transport->url,
 774                                transport->remote->name,
 775                                ref_map);
 776        transport_unlock_pack(transport);
 777        return ret;
 778}
 779
 780static int prune_refs(struct refspec *refs, int ref_count, struct ref *ref_map,
 781                const char *raw_url)
 782{
 783        int url_len, i, result = 0;
 784        struct ref *ref, *stale_refs = get_stale_heads(refs, ref_count, ref_map);
 785        char *url;
 786        const char *dangling_msg = dry_run
 787                ? _("   (%s will become dangling)")
 788                : _("   (%s has become dangling)");
 789
 790        if (raw_url)
 791                url = transport_anonymize_url(raw_url);
 792        else
 793                url = xstrdup("foreign");
 794
 795        url_len = strlen(url);
 796        for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 797                ;
 798
 799        url_len = i + 1;
 800        if (4 < i && !strncmp(".git", url + i - 3, 4))
 801                url_len = i - 3;
 802
 803        if (!dry_run) {
 804                struct string_list refnames = STRING_LIST_INIT_NODUP;
 805
 806                for (ref = stale_refs; ref; ref = ref->next)
 807                        string_list_append(&refnames, ref->name);
 808
 809                result = delete_refs(&refnames);
 810                string_list_clear(&refnames, 0);
 811        }
 812
 813        if (verbosity >= 0) {
 814                for (ref = stale_refs; ref; ref = ref->next) {
 815                        if (!shown_url) {
 816                                fprintf(stderr, _("From %.*s\n"), url_len, url);
 817                                shown_url = 1;
 818                        }
 819                        fprintf(stderr, " x %-*s %-*s -> %s\n",
 820                                TRANSPORT_SUMMARY(_("[deleted]")),
 821                                REFCOL_WIDTH, _("(none)"), prettify_refname(ref->name));
 822                        warn_dangling_symref(stderr, dangling_msg, ref->name);
 823                }
 824        }
 825
 826        free(url);
 827        free_refs(stale_refs);
 828        return result;
 829}
 830
 831static void check_not_current_branch(struct ref *ref_map)
 832{
 833        struct branch *current_branch = branch_get(NULL);
 834
 835        if (is_bare_repository() || !current_branch)
 836                return;
 837
 838        for (; ref_map; ref_map = ref_map->next)
 839                if (ref_map->peer_ref && !strcmp(current_branch->refname,
 840                                        ref_map->peer_ref->name))
 841                        die(_("Refusing to fetch into current branch %s "
 842                            "of non-bare repository"), current_branch->refname);
 843}
 844
 845static int truncate_fetch_head(void)
 846{
 847        const char *filename = git_path_fetch_head();
 848        FILE *fp = fopen_for_writing(filename);
 849
 850        if (!fp)
 851                return error_errno(_("cannot open %s"), filename);
 852        fclose(fp);
 853        return 0;
 854}
 855
 856static void set_option(struct transport *transport, const char *name, const char *value)
 857{
 858        int r = transport_set_option(transport, name, value);
 859        if (r < 0)
 860                die(_("Option \"%s\" value \"%s\" is not valid for %s"),
 861                    name, value, transport->url);
 862        if (r > 0)
 863                warning(_("Option \"%s\" is ignored for %s\n"),
 864                        name, transport->url);
 865}
 866
 867static struct transport *prepare_transport(struct remote *remote)
 868{
 869        struct transport *transport;
 870        transport = transport_get(remote, NULL);
 871        transport_set_verbosity(transport, verbosity, progress);
 872        transport->family = family;
 873        if (upload_pack)
 874                set_option(transport, TRANS_OPT_UPLOADPACK, upload_pack);
 875        if (keep)
 876                set_option(transport, TRANS_OPT_KEEP, "yes");
 877        if (depth)
 878                set_option(transport, TRANS_OPT_DEPTH, depth);
 879        if (update_shallow)
 880                set_option(transport, TRANS_OPT_UPDATE_SHALLOW, "yes");
 881        return transport;
 882}
 883
 884static void backfill_tags(struct transport *transport, struct ref *ref_map)
 885{
 886        if (transport->cannot_reuse) {
 887                gsecondary = prepare_transport(transport->remote);
 888                transport = gsecondary;
 889        }
 890
 891        transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
 892        transport_set_option(transport, TRANS_OPT_DEPTH, "0");
 893        fetch_refs(transport, ref_map);
 894
 895        if (gsecondary) {
 896                transport_disconnect(gsecondary);
 897                gsecondary = NULL;
 898        }
 899}
 900
 901static int do_fetch(struct transport *transport,
 902                    struct refspec *refs, int ref_count)
 903{
 904        struct string_list existing_refs = STRING_LIST_INIT_DUP;
 905        struct ref *ref_map;
 906        struct ref *rm;
 907        int autotags = (transport->remote->fetch_tags == 1);
 908        int retcode = 0;
 909
 910        for_each_ref(add_existing, &existing_refs);
 911
 912        if (tags == TAGS_DEFAULT) {
 913                if (transport->remote->fetch_tags == 2)
 914                        tags = TAGS_SET;
 915                if (transport->remote->fetch_tags == -1)
 916                        tags = TAGS_UNSET;
 917        }
 918
 919        if (!transport->get_refs_list || !transport->fetch)
 920                die(_("Don't know how to fetch from %s"), transport->url);
 921
 922        /* if not appending, truncate FETCH_HEAD */
 923        if (!append && !dry_run) {
 924                retcode = truncate_fetch_head();
 925                if (retcode)
 926                        goto cleanup;
 927        }
 928
 929        ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
 930        if (!update_head_ok)
 931                check_not_current_branch(ref_map);
 932
 933        for (rm = ref_map; rm; rm = rm->next) {
 934                if (rm->peer_ref) {
 935                        struct string_list_item *peer_item =
 936                                string_list_lookup(&existing_refs,
 937                                                   rm->peer_ref->name);
 938                        if (peer_item) {
 939                                struct object_id *old_oid = peer_item->util;
 940                                oidcpy(&rm->peer_ref->old_oid, old_oid);
 941                        }
 942                }
 943        }
 944
 945        if (tags == TAGS_DEFAULT && autotags)
 946                transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 947        if (prune) {
 948                /*
 949                 * We only prune based on refspecs specified
 950                 * explicitly (via command line or configuration); we
 951                 * don't care whether --tags was specified.
 952                 */
 953                if (ref_count) {
 954                        prune_refs(refs, ref_count, ref_map, transport->url);
 955                } else {
 956                        prune_refs(transport->remote->fetch,
 957                                   transport->remote->fetch_refspec_nr,
 958                                   ref_map,
 959                                   transport->url);
 960                }
 961        }
 962        if (fetch_refs(transport, ref_map)) {
 963                free_refs(ref_map);
 964                retcode = 1;
 965                goto cleanup;
 966        }
 967        free_refs(ref_map);
 968
 969        /* if neither --no-tags nor --tags was specified, do automated tag
 970         * following ... */
 971        if (tags == TAGS_DEFAULT && autotags) {
 972                struct ref **tail = &ref_map;
 973                ref_map = NULL;
 974                find_non_local_tags(transport, &ref_map, &tail);
 975                if (ref_map)
 976                        backfill_tags(transport, ref_map);
 977                free_refs(ref_map);
 978        }
 979
 980 cleanup:
 981        string_list_clear(&existing_refs, 1);
 982        return retcode;
 983}
 984
 985static int get_one_remote_for_fetch(struct remote *remote, void *priv)
 986{
 987        struct string_list *list = priv;
 988        if (!remote->skip_default_update)
 989                string_list_append(list, remote->name);
 990        return 0;
 991}
 992
 993struct remote_group_data {
 994        const char *name;
 995        struct string_list *list;
 996};
 997
 998static int get_remote_group(const char *key, const char *value, void *priv)
 999{
1000        struct remote_group_data *g = priv;
1001
1002        if (skip_prefix(key, "remotes.", &key) && !strcmp(key, g->name)) {
1003                /* split list by white space */
1004                while (*value) {
1005                        size_t wordlen = strcspn(value, " \t\n");
1006
1007                        if (wordlen >= 1)
1008                                string_list_append_nodup(g->list,
1009                                                   xstrndup(value, wordlen));
1010                        value += wordlen + (value[wordlen] != '\0');
1011                }
1012        }
1013
1014        return 0;
1015}
1016
1017static int add_remote_or_group(const char *name, struct string_list *list)
1018{
1019        int prev_nr = list->nr;
1020        struct remote_group_data g;
1021        g.name = name; g.list = list;
1022
1023        git_config(get_remote_group, &g);
1024        if (list->nr == prev_nr) {
1025                struct remote *remote = remote_get(name);
1026                if (!remote_is_configured(remote))
1027                        return 0;
1028                string_list_append(list, remote->name);
1029        }
1030        return 1;
1031}
1032
1033static void add_options_to_argv(struct argv_array *argv)
1034{
1035        if (dry_run)
1036                argv_array_push(argv, "--dry-run");
1037        if (prune != -1)
1038                argv_array_push(argv, prune ? "--prune" : "--no-prune");
1039        if (update_head_ok)
1040                argv_array_push(argv, "--update-head-ok");
1041        if (force)
1042                argv_array_push(argv, "--force");
1043        if (keep)
1044                argv_array_push(argv, "--keep");
1045        if (recurse_submodules == RECURSE_SUBMODULES_ON)
1046                argv_array_push(argv, "--recurse-submodules");
1047        else if (recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND)
1048                argv_array_push(argv, "--recurse-submodules=on-demand");
1049        if (tags == TAGS_SET)
1050                argv_array_push(argv, "--tags");
1051        else if (tags == TAGS_UNSET)
1052                argv_array_push(argv, "--no-tags");
1053        if (verbosity >= 2)
1054                argv_array_push(argv, "-v");
1055        if (verbosity >= 1)
1056                argv_array_push(argv, "-v");
1057        else if (verbosity < 0)
1058                argv_array_push(argv, "-q");
1059
1060}
1061
1062static int fetch_multiple(struct string_list *list)
1063{
1064        int i, result = 0;
1065        struct argv_array argv = ARGV_ARRAY_INIT;
1066
1067        if (!append && !dry_run) {
1068                int errcode = truncate_fetch_head();
1069                if (errcode)
1070                        return errcode;
1071        }
1072
1073        argv_array_pushl(&argv, "fetch", "--append", NULL);
1074        add_options_to_argv(&argv);
1075
1076        for (i = 0; i < list->nr; i++) {
1077                const char *name = list->items[i].string;
1078                argv_array_push(&argv, name);
1079                if (verbosity >= 0)
1080                        printf(_("Fetching %s\n"), name);
1081                if (run_command_v_opt(argv.argv, RUN_GIT_CMD)) {
1082                        error(_("Could not fetch %s"), name);
1083                        result = 1;
1084                }
1085                argv_array_pop(&argv);
1086        }
1087
1088        argv_array_clear(&argv);
1089        return result;
1090}
1091
1092static int fetch_one(struct remote *remote, int argc, const char **argv)
1093{
1094        static const char **refs = NULL;
1095        struct refspec *refspec;
1096        int ref_nr = 0;
1097        int exit_code;
1098
1099        if (!remote)
1100                die(_("No remote repository specified.  Please, specify either a URL or a\n"
1101                    "remote name from which new revisions should be fetched."));
1102
1103        gtransport = prepare_transport(remote);
1104
1105        if (prune < 0) {
1106                /* no command line request */
1107                if (0 <= gtransport->remote->prune)
1108                        prune = gtransport->remote->prune;
1109                else if (0 <= fetch_prune_config)
1110                        prune = fetch_prune_config;
1111                else
1112                        prune = PRUNE_BY_DEFAULT;
1113        }
1114
1115        if (argc > 0) {
1116                int j = 0;
1117                int i;
1118                refs = xcalloc(st_add(argc, 1), sizeof(const char *));
1119                for (i = 0; i < argc; i++) {
1120                        if (!strcmp(argv[i], "tag")) {
1121                                i++;
1122                                if (i >= argc)
1123                                        die(_("You need to specify a tag name."));
1124                                refs[j++] = xstrfmt("refs/tags/%s:refs/tags/%s",
1125                                                    argv[i], argv[i]);
1126                        } else
1127                                refs[j++] = argv[i];
1128                }
1129                refs[j] = NULL;
1130                ref_nr = j;
1131        }
1132
1133        sigchain_push_common(unlock_pack_on_signal);
1134        atexit(unlock_pack);
1135        refspec = parse_fetch_refspec(ref_nr, refs);
1136        exit_code = do_fetch(gtransport, refspec, ref_nr);
1137        free_refspec(ref_nr, refspec);
1138        transport_disconnect(gtransport);
1139        gtransport = NULL;
1140        return exit_code;
1141}
1142
1143int cmd_fetch(int argc, const char **argv, const char *prefix)
1144{
1145        int i;
1146        struct string_list list = STRING_LIST_INIT_DUP;
1147        struct remote *remote;
1148        int result = 0;
1149        struct argv_array argv_gc_auto = ARGV_ARRAY_INIT;
1150
1151        packet_trace_identity("fetch");
1152
1153        /* Record the command line for the reflog */
1154        strbuf_addstr(&default_rla, "fetch");
1155        for (i = 1; i < argc; i++)
1156                strbuf_addf(&default_rla, " %s", argv[i]);
1157
1158        git_config(git_fetch_config, NULL);
1159
1160        argc = parse_options(argc, argv, prefix,
1161                             builtin_fetch_options, builtin_fetch_usage, 0);
1162
1163        if (unshallow) {
1164                if (depth)
1165                        die(_("--depth and --unshallow cannot be used together"));
1166                else if (!is_repository_shallow())
1167                        die(_("--unshallow on a complete repository does not make sense"));
1168                else
1169                        depth = xstrfmt("%d", INFINITE_DEPTH);
1170        }
1171
1172        /* no need to be strict, transport_set_option() will validate it again */
1173        if (depth && atoi(depth) < 1)
1174                die(_("depth %s is not a positive number"), depth);
1175
1176        if (recurse_submodules != RECURSE_SUBMODULES_OFF) {
1177                if (recurse_submodules_default) {
1178                        int arg = parse_fetch_recurse_submodules_arg("--recurse-submodules-default", recurse_submodules_default);
1179                        set_config_fetch_recurse_submodules(arg);
1180                }
1181                gitmodules_config();
1182                git_config(submodule_config, NULL);
1183        }
1184
1185        if (all) {
1186                if (argc == 1)
1187                        die(_("fetch --all does not take a repository argument"));
1188                else if (argc > 1)
1189                        die(_("fetch --all does not make sense with refspecs"));
1190                (void) for_each_remote(get_one_remote_for_fetch, &list);
1191                result = fetch_multiple(&list);
1192        } else if (argc == 0) {
1193                /* No arguments -- use default remote */
1194                remote = remote_get(NULL);
1195                result = fetch_one(remote, argc, argv);
1196        } else if (multiple) {
1197                /* All arguments are assumed to be remotes or groups */
1198                for (i = 0; i < argc; i++)
1199                        if (!add_remote_or_group(argv[i], &list))
1200                                die(_("No such remote or remote group: %s"), argv[i]);
1201                result = fetch_multiple(&list);
1202        } else {
1203                /* Single remote or group */
1204                (void) add_remote_or_group(argv[0], &list);
1205                if (list.nr > 1) {
1206                        /* More than one remote */
1207                        if (argc > 1)
1208                                die(_("Fetching a group and specifying refspecs does not make sense"));
1209                        result = fetch_multiple(&list);
1210                } else {
1211                        /* Zero or one remotes */
1212                        remote = remote_get(argv[0]);
1213                        result = fetch_one(remote, argc-1, argv+1);
1214                }
1215        }
1216
1217        if (!result && (recurse_submodules != RECURSE_SUBMODULES_OFF)) {
1218                struct argv_array options = ARGV_ARRAY_INIT;
1219
1220                add_options_to_argv(&options);
1221                result = fetch_populated_submodules(&options,
1222                                                    submodule_prefix,
1223                                                    recurse_submodules,
1224                                                    verbosity < 0,
1225                                                    max_children);
1226                argv_array_clear(&options);
1227        }
1228
1229        string_list_clear(&list, 0);
1230
1231        close_all_packs();
1232
1233        argv_array_pushl(&argv_gc_auto, "gc", "--auto", NULL);
1234        if (verbosity < 0)
1235                argv_array_push(&argv_gc_auto, "--quiet");
1236        run_command_v_opt(argv_gc_auto.argv, RUN_GIT_CMD);
1237        argv_array_clear(&argv_gc_auto);
1238
1239        return result;
1240}