builtin / fetch.con commit help: drop prepend function in favor of xstrfmt (acd47ee)
   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 const char *depth;
  41static const char *upload_pack;
  42static struct strbuf default_rla = STRBUF_INIT;
  43static struct transport *gtransport;
  44static struct transport *gsecondary;
  45static const char *submodule_prefix = "";
  46static const char *recurse_submodules_default;
  47static int shown_url = 0;
  48static int refmap_alloc, refmap_nr;
  49static const char **refmap_array;
  50
  51static int option_parse_recurse_submodules(const struct option *opt,
  52                                   const char *arg, int unset)
  53{
  54        if (unset) {
  55                recurse_submodules = RECURSE_SUBMODULES_OFF;
  56        } else {
  57                if (arg)
  58                        recurse_submodules = parse_fetch_recurse_submodules_arg(opt->long_name, arg);
  59                else
  60                        recurse_submodules = RECURSE_SUBMODULES_ON;
  61        }
  62        return 0;
  63}
  64
  65static int git_fetch_config(const char *k, const char *v, void *cb)
  66{
  67        if (!strcmp(k, "fetch.prune")) {
  68                fetch_prune_config = git_config_bool(k, v);
  69                return 0;
  70        }
  71        return git_default_config(k, v, cb);
  72}
  73
  74static int parse_refmap_arg(const struct option *opt, const char *arg, int unset)
  75{
  76        ALLOC_GROW(refmap_array, refmap_nr + 1, refmap_alloc);
  77
  78        /*
  79         * "git fetch --refmap='' origin foo"
  80         * can be used to tell the command not to store anywhere
  81         */
  82        if (*arg)
  83                refmap_array[refmap_nr++] = arg;
  84        return 0;
  85}
  86
  87static struct option builtin_fetch_options[] = {
  88        OPT__VERBOSITY(&verbosity),
  89        OPT_BOOL(0, "all", &all,
  90                 N_("fetch from all remotes")),
  91        OPT_BOOL('a', "append", &append,
  92                 N_("append to .git/FETCH_HEAD instead of overwriting")),
  93        OPT_STRING(0, "upload-pack", &upload_pack, N_("path"),
  94                   N_("path to upload pack on remote end")),
  95        OPT__FORCE(&force, N_("force overwrite of local branch")),
  96        OPT_BOOL('m', "multiple", &multiple,
  97                 N_("fetch from multiple remotes")),
  98        OPT_SET_INT('t', "tags", &tags,
  99                    N_("fetch all tags and associated objects"), TAGS_SET),
 100        OPT_SET_INT('n', NULL, &tags,
 101                    N_("do not fetch all tags (--no-tags)"), TAGS_UNSET),
 102        OPT_BOOL('p', "prune", &prune,
 103                 N_("prune remote-tracking branches no longer on remote")),
 104        { OPTION_CALLBACK, 0, "recurse-submodules", NULL, N_("on-demand"),
 105                    N_("control recursive fetching of submodules"),
 106                    PARSE_OPT_OPTARG, option_parse_recurse_submodules },
 107        OPT_BOOL(0, "dry-run", &dry_run,
 108                 N_("dry run")),
 109        OPT_BOOL('k', "keep", &keep, N_("keep downloaded pack")),
 110        OPT_BOOL('u', "update-head-ok", &update_head_ok,
 111                    N_("allow updating of HEAD ref")),
 112        OPT_BOOL(0, "progress", &progress, N_("force progress reporting")),
 113        OPT_STRING(0, "depth", &depth, N_("depth"),
 114                   N_("deepen history of shallow clone")),
 115        { OPTION_SET_INT, 0, "unshallow", &unshallow, NULL,
 116                   N_("convert to a complete repository"),
 117                   PARSE_OPT_NONEG | PARSE_OPT_NOARG, NULL, 1 },
 118        { OPTION_STRING, 0, "submodule-prefix", &submodule_prefix, N_("dir"),
 119                   N_("prepend this to submodule path output"), PARSE_OPT_HIDDEN },
 120        { OPTION_STRING, 0, "recurse-submodules-default",
 121                   &recurse_submodules_default, NULL,
 122                   N_("default mode for recursion"), PARSE_OPT_HIDDEN },
 123        OPT_BOOL(0, "update-shallow", &update_shallow,
 124                 N_("accept refs that update .git/shallow")),
 125        { OPTION_CALLBACK, 0, "refmap", NULL, N_("refmap"),
 126          N_("specify fetch refmap"), PARSE_OPT_NONEG, parse_refmap_arg },
 127        OPT_END()
 128};
 129
 130static void unlock_pack(void)
 131{
 132        if (gtransport)
 133                transport_unlock_pack(gtransport);
 134        if (gsecondary)
 135                transport_unlock_pack(gsecondary);
 136}
 137
 138static void unlock_pack_on_signal(int signo)
 139{
 140        unlock_pack();
 141        sigchain_pop(signo);
 142        raise(signo);
 143}
 144
 145static void add_merge_config(struct ref **head,
 146                           const struct ref *remote_refs,
 147                           struct branch *branch,
 148                           struct ref ***tail)
 149{
 150        int i;
 151
 152        for (i = 0; i < branch->merge_nr; i++) {
 153                struct ref *rm, **old_tail = *tail;
 154                struct refspec refspec;
 155
 156                for (rm = *head; rm; rm = rm->next) {
 157                        if (branch_merge_matches(branch, i, rm->name)) {
 158                                rm->fetch_head_status = FETCH_HEAD_MERGE;
 159                                break;
 160                        }
 161                }
 162                if (rm)
 163                        continue;
 164
 165                /*
 166                 * Not fetched to a remote-tracking branch?  We need to fetch
 167                 * it anyway to allow this branch's "branch.$name.merge"
 168                 * to be honored by 'git pull', but we do not have to
 169                 * fail if branch.$name.merge is misconfigured to point
 170                 * at a nonexisting branch.  If we were indeed called by
 171                 * 'git pull', it will notice the misconfiguration because
 172                 * there is no entry in the resulting FETCH_HEAD marked
 173                 * for merging.
 174                 */
 175                memset(&refspec, 0, sizeof(refspec));
 176                refspec.src = branch->merge[i]->src;
 177                get_fetch_map(remote_refs, &refspec, tail, 1);
 178                for (rm = *old_tail; rm; rm = rm->next)
 179                        rm->fetch_head_status = FETCH_HEAD_MERGE;
 180        }
 181}
 182
 183static int add_existing(const char *refname, const struct object_id *oid,
 184                        int flag, void *cbdata)
 185{
 186        struct string_list *list = (struct string_list *)cbdata;
 187        struct string_list_item *item = string_list_insert(list, refname);
 188        struct object_id *old_oid = xmalloc(sizeof(*old_oid));
 189
 190        oidcpy(old_oid, oid);
 191        item->util = old_oid;
 192        return 0;
 193}
 194
 195static int will_fetch(struct ref **head, const unsigned char *sha1)
 196{
 197        struct ref *rm = *head;
 198        while (rm) {
 199                if (!hashcmp(rm->old_sha1, sha1))
 200                        return 1;
 201                rm = rm->next;
 202        }
 203        return 0;
 204}
 205
 206static void find_non_local_tags(struct transport *transport,
 207                        struct ref **head,
 208                        struct ref ***tail)
 209{
 210        struct string_list existing_refs = STRING_LIST_INIT_DUP;
 211        struct string_list remote_refs = STRING_LIST_INIT_NODUP;
 212        const struct ref *ref;
 213        struct string_list_item *item = NULL;
 214
 215        for_each_ref(add_existing, &existing_refs);
 216        for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
 217                if (!starts_with(ref->name, "refs/tags/"))
 218                        continue;
 219
 220                /*
 221                 * The peeled ref always follows the matching base
 222                 * ref, so if we see a peeled ref that we don't want
 223                 * to fetch then we can mark the ref entry in the list
 224                 * as one to ignore by setting util to NULL.
 225                 */
 226                if (ends_with(ref->name, "^{}")) {
 227                        if (item && !has_sha1_file(ref->old_sha1) &&
 228                            !will_fetch(head, ref->old_sha1) &&
 229                            !has_sha1_file(item->util) &&
 230                            !will_fetch(head, item->util))
 231                                item->util = NULL;
 232                        item = NULL;
 233                        continue;
 234                }
 235
 236                /*
 237                 * If item is non-NULL here, then we previously saw a
 238                 * ref not followed by a peeled reference, so we need
 239                 * to check if it is a lightweight tag that we want to
 240                 * fetch.
 241                 */
 242                if (item && !has_sha1_file(item->util) &&
 243                    !will_fetch(head, item->util))
 244                        item->util = NULL;
 245
 246                item = NULL;
 247
 248                /* skip duplicates and refs that we already have */
 249                if (string_list_has_string(&remote_refs, ref->name) ||
 250                    string_list_has_string(&existing_refs, ref->name))
 251                        continue;
 252
 253                item = string_list_insert(&remote_refs, ref->name);
 254                item->util = (void *)ref->old_sha1;
 255        }
 256        string_list_clear(&existing_refs, 1);
 257
 258        /*
 259         * We may have a final lightweight tag that needs to be
 260         * checked to see if it needs fetching.
 261         */
 262        if (item && !has_sha1_file(item->util) &&
 263            !will_fetch(head, item->util))
 264                item->util = NULL;
 265
 266        /*
 267         * For all the tags in the remote_refs string list,
 268         * add them to the list of refs to be fetched
 269         */
 270        for_each_string_list_item(item, &remote_refs) {
 271                /* Unless we have already decided to ignore this item... */
 272                if (item->util)
 273                {
 274                        struct ref *rm = alloc_ref(item->string);
 275                        rm->peer_ref = alloc_ref(item->string);
 276                        hashcpy(rm->old_sha1, item->util);
 277                        **tail = rm;
 278                        *tail = &rm->next;
 279                }
 280        }
 281
 282        string_list_clear(&remote_refs, 0);
 283}
 284
 285static struct ref *get_ref_map(struct transport *transport,
 286                               struct refspec *refspecs, int refspec_count,
 287                               int tags, int *autotags)
 288{
 289        int i;
 290        struct ref *rm;
 291        struct ref *ref_map = NULL;
 292        struct ref **tail = &ref_map;
 293
 294        /* opportunistically-updated references: */
 295        struct ref *orefs = NULL, **oref_tail = &orefs;
 296
 297        const struct ref *remote_refs = transport_get_remote_refs(transport);
 298
 299        if (refspec_count) {
 300                struct refspec *fetch_refspec;
 301                int fetch_refspec_nr;
 302
 303                for (i = 0; i < refspec_count; i++) {
 304                        get_fetch_map(remote_refs, &refspecs[i], &tail, 0);
 305                        if (refspecs[i].dst && refspecs[i].dst[0])
 306                                *autotags = 1;
 307                }
 308                /* Merge everything on the command line (but not --tags) */
 309                for (rm = ref_map; rm; rm = rm->next)
 310                        rm->fetch_head_status = FETCH_HEAD_MERGE;
 311
 312                /*
 313                 * For any refs that we happen to be fetching via
 314                 * command-line arguments, the destination ref might
 315                 * have been missing or have been different than the
 316                 * remote-tracking ref that would be derived from the
 317                 * configured refspec.  In these cases, we want to
 318                 * take the opportunity to update their configured
 319                 * remote-tracking reference.  However, we do not want
 320                 * to mention these entries in FETCH_HEAD at all, as
 321                 * they would simply be duplicates of existing
 322                 * entries, so we set them FETCH_HEAD_IGNORE below.
 323                 *
 324                 * We compute these entries now, based only on the
 325                 * refspecs specified on the command line.  But we add
 326                 * them to the list following the refspecs resulting
 327                 * from the tags option so that one of the latter,
 328                 * which has FETCH_HEAD_NOT_FOR_MERGE, is not removed
 329                 * by ref_remove_duplicates() in favor of one of these
 330                 * opportunistic entries with FETCH_HEAD_IGNORE.
 331                 */
 332                if (refmap_array) {
 333                        fetch_refspec = parse_fetch_refspec(refmap_nr, refmap_array);
 334                        fetch_refspec_nr = refmap_nr;
 335                } else {
 336                        fetch_refspec = transport->remote->fetch;
 337                        fetch_refspec_nr = transport->remote->fetch_refspec_nr;
 338                }
 339
 340                for (i = 0; i < fetch_refspec_nr; i++)
 341                        get_fetch_map(ref_map, &fetch_refspec[i], &oref_tail, 1);
 342
 343                if (tags == TAGS_SET)
 344                        get_fetch_map(remote_refs, tag_refspec, &tail, 0);
 345        } else if (refmap_array) {
 346                die("--refmap option is only meaningful with command-line refspec(s).");
 347        } else {
 348                /* Use the defaults */
 349                struct remote *remote = transport->remote;
 350                struct branch *branch = branch_get(NULL);
 351                int has_merge = branch_has_merge_config(branch);
 352                if (remote &&
 353                    (remote->fetch_refspec_nr ||
 354                     /* Note: has_merge implies non-NULL branch->remote_name */
 355                     (has_merge && !strcmp(branch->remote_name, remote->name)))) {
 356                        for (i = 0; i < remote->fetch_refspec_nr; i++) {
 357                                get_fetch_map(remote_refs, &remote->fetch[i], &tail, 0);
 358                                if (remote->fetch[i].dst &&
 359                                    remote->fetch[i].dst[0])
 360                                        *autotags = 1;
 361                                if (!i && !has_merge && ref_map &&
 362                                    !remote->fetch[0].pattern)
 363                                        ref_map->fetch_head_status = FETCH_HEAD_MERGE;
 364                        }
 365                        /*
 366                         * if the remote we're fetching from is the same
 367                         * as given in branch.<name>.remote, we add the
 368                         * ref given in branch.<name>.merge, too.
 369                         *
 370                         * Note: has_merge implies non-NULL branch->remote_name
 371                         */
 372                        if (has_merge &&
 373                            !strcmp(branch->remote_name, remote->name))
 374                                add_merge_config(&ref_map, remote_refs, branch, &tail);
 375                } else {
 376                        ref_map = get_remote_ref(remote_refs, "HEAD");
 377                        if (!ref_map)
 378                                die(_("Couldn't find remote ref HEAD"));
 379                        ref_map->fetch_head_status = FETCH_HEAD_MERGE;
 380                        tail = &ref_map->next;
 381                }
 382        }
 383
 384        if (tags == TAGS_SET)
 385                /* also fetch all tags */
 386                get_fetch_map(remote_refs, tag_refspec, &tail, 0);
 387        else if (tags == TAGS_DEFAULT && *autotags)
 388                find_non_local_tags(transport, &ref_map, &tail);
 389
 390        /* Now append any refs to be updated opportunistically: */
 391        *tail = orefs;
 392        for (rm = orefs; rm; rm = rm->next) {
 393                rm->fetch_head_status = FETCH_HEAD_IGNORE;
 394                tail = &rm->next;
 395        }
 396
 397        return ref_remove_duplicates(ref_map);
 398}
 399
 400#define STORE_REF_ERROR_OTHER 1
 401#define STORE_REF_ERROR_DF_CONFLICT 2
 402
 403static int s_update_ref(const char *action,
 404                        struct ref *ref,
 405                        int check_old)
 406{
 407        char msg[1024];
 408        char *rla = getenv("GIT_REFLOG_ACTION");
 409        struct ref_transaction *transaction;
 410        struct strbuf err = STRBUF_INIT;
 411        int ret, df_conflict = 0;
 412
 413        if (dry_run)
 414                return 0;
 415        if (!rla)
 416                rla = default_rla.buf;
 417        snprintf(msg, sizeof(msg), "%s: %s", rla, action);
 418
 419        transaction = ref_transaction_begin(&err);
 420        if (!transaction ||
 421            ref_transaction_update(transaction, ref->name,
 422                                   ref->new_sha1,
 423                                   check_old ? ref->old_sha1 : NULL,
 424                                   0, msg, &err))
 425                goto fail;
 426
 427        ret = ref_transaction_commit(transaction, &err);
 428        if (ret) {
 429                df_conflict = (ret == TRANSACTION_NAME_CONFLICT);
 430                goto fail;
 431        }
 432
 433        ref_transaction_free(transaction);
 434        strbuf_release(&err);
 435        return 0;
 436fail:
 437        ref_transaction_free(transaction);
 438        error("%s", err.buf);
 439        strbuf_release(&err);
 440        return df_conflict ? STORE_REF_ERROR_DF_CONFLICT
 441                           : STORE_REF_ERROR_OTHER;
 442}
 443
 444#define REFCOL_WIDTH  10
 445
 446static int update_local_ref(struct ref *ref,
 447                            const char *remote,
 448                            const struct ref *remote_ref,
 449                            struct strbuf *display)
 450{
 451        struct commit *current = NULL, *updated;
 452        enum object_type type;
 453        struct branch *current_branch = branch_get(NULL);
 454        const char *pretty_ref = prettify_refname(ref->name);
 455
 456        type = sha1_object_info(ref->new_sha1, NULL);
 457        if (type < 0)
 458                die(_("object %s not found"), sha1_to_hex(ref->new_sha1));
 459
 460        if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
 461                if (verbosity > 0)
 462                        strbuf_addf(display, "= %-*s %-*s -> %s",
 463                                    TRANSPORT_SUMMARY(_("[up to date]")),
 464                                    REFCOL_WIDTH, remote, pretty_ref);
 465                return 0;
 466        }
 467
 468        if (current_branch &&
 469            !strcmp(ref->name, current_branch->name) &&
 470            !(update_head_ok || is_bare_repository()) &&
 471            !is_null_sha1(ref->old_sha1)) {
 472                /*
 473                 * If this is the head, and it's not okay to update
 474                 * the head, and the old value of the head isn't empty...
 475                 */
 476                strbuf_addf(display,
 477                            _("! %-*s %-*s -> %s  (can't fetch in current branch)"),
 478                            TRANSPORT_SUMMARY(_("[rejected]")),
 479                            REFCOL_WIDTH, remote, pretty_ref);
 480                return 1;
 481        }
 482
 483        if (!is_null_sha1(ref->old_sha1) &&
 484            starts_with(ref->name, "refs/tags/")) {
 485                int r;
 486                r = s_update_ref("updating tag", ref, 0);
 487                strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 488                            r ? '!' : '-',
 489                            TRANSPORT_SUMMARY(_("[tag update]")),
 490                            REFCOL_WIDTH, remote, pretty_ref,
 491                            r ? _("  (unable to update local ref)") : "");
 492                return r;
 493        }
 494
 495        current = lookup_commit_reference_gently(ref->old_sha1, 1);
 496        updated = lookup_commit_reference_gently(ref->new_sha1, 1);
 497        if (!current || !updated) {
 498                const char *msg;
 499                const char *what;
 500                int r;
 501                /*
 502                 * Nicely describe the new ref we're fetching.
 503                 * Base this on the remote's ref name, as it's
 504                 * more likely to follow a standard layout.
 505                 */
 506                const char *name = remote_ref ? remote_ref->name : "";
 507                if (starts_with(name, "refs/tags/")) {
 508                        msg = "storing tag";
 509                        what = _("[new tag]");
 510                } else if (starts_with(name, "refs/heads/")) {
 511                        msg = "storing head";
 512                        what = _("[new branch]");
 513                } else {
 514                        msg = "storing ref";
 515                        what = _("[new ref]");
 516                }
 517
 518                if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 519                    (recurse_submodules != RECURSE_SUBMODULES_ON))
 520                        check_for_new_submodule_commits(ref->new_sha1);
 521                r = s_update_ref(msg, ref, 0);
 522                strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 523                            r ? '!' : '*',
 524                            TRANSPORT_SUMMARY(what),
 525                            REFCOL_WIDTH, remote, pretty_ref,
 526                            r ? _("  (unable to update local ref)") : "");
 527                return r;
 528        }
 529
 530        if (in_merge_bases(current, updated)) {
 531                char quickref[83];
 532                int r;
 533                strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 534                strcat(quickref, "..");
 535                strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 536                if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 537                    (recurse_submodules != RECURSE_SUBMODULES_ON))
 538                        check_for_new_submodule_commits(ref->new_sha1);
 539                r = s_update_ref("fast-forward", ref, 1);
 540                strbuf_addf(display, "%c %-*s %-*s -> %s%s",
 541                            r ? '!' : ' ',
 542                            TRANSPORT_SUMMARY_WIDTH, quickref,
 543                            REFCOL_WIDTH, remote, pretty_ref,
 544                            r ? _("  (unable to update local ref)") : "");
 545                return r;
 546        } else if (force || ref->force) {
 547                char quickref[84];
 548                int r;
 549                strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
 550                strcat(quickref, "...");
 551                strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
 552                if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
 553                    (recurse_submodules != RECURSE_SUBMODULES_ON))
 554                        check_for_new_submodule_commits(ref->new_sha1);
 555                r = s_update_ref("forced-update", ref, 1);
 556                strbuf_addf(display, "%c %-*s %-*s -> %s  (%s)",
 557                            r ? '!' : '+',
 558                            TRANSPORT_SUMMARY_WIDTH, quickref,
 559                            REFCOL_WIDTH, remote, pretty_ref,
 560                            r ? _("unable to update local ref") : _("forced update"));
 561                return r;
 562        } else {
 563                strbuf_addf(display, "! %-*s %-*s -> %s  %s",
 564                            TRANSPORT_SUMMARY(_("[rejected]")),
 565                            REFCOL_WIDTH, remote, pretty_ref,
 566                            _("(non-fast-forward)"));
 567                return 1;
 568        }
 569}
 570
 571static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
 572{
 573        struct ref **rm = cb_data;
 574        struct ref *ref = *rm;
 575
 576        while (ref && ref->status == REF_STATUS_REJECT_SHALLOW)
 577                ref = ref->next;
 578        if (!ref)
 579                return -1; /* end of the list */
 580        *rm = ref->next;
 581        hashcpy(sha1, ref->old_sha1);
 582        return 0;
 583}
 584
 585static int store_updated_refs(const char *raw_url, const char *remote_name,
 586                struct ref *ref_map)
 587{
 588        FILE *fp;
 589        struct commit *commit;
 590        int url_len, i, rc = 0;
 591        struct strbuf note = STRBUF_INIT;
 592        const char *what, *kind;
 593        struct ref *rm;
 594        char *url;
 595        const char *filename = dry_run ? "/dev/null" : git_path_fetch_head();
 596        int want_status;
 597
 598        fp = fopen(filename, "a");
 599        if (!fp)
 600                return error(_("cannot open %s: %s\n"), filename, strerror(errno));
 601
 602        if (raw_url)
 603                url = transport_anonymize_url(raw_url);
 604        else
 605                url = xstrdup("foreign");
 606
 607        rm = ref_map;
 608        if (check_everything_connected(iterate_ref_map, 0, &rm)) {
 609                rc = error(_("%s did not send all necessary objects\n"), url);
 610                goto abort;
 611        }
 612
 613        /*
 614         * We do a pass for each fetch_head_status type in their enum order, so
 615         * merged entries are written before not-for-merge. That lets readers
 616         * use FETCH_HEAD as a refname to refer to the ref to be merged.
 617         */
 618        for (want_status = FETCH_HEAD_MERGE;
 619             want_status <= FETCH_HEAD_IGNORE;
 620             want_status++) {
 621                for (rm = ref_map; rm; rm = rm->next) {
 622                        struct ref *ref = NULL;
 623                        const char *merge_status_marker = "";
 624
 625                        if (rm->status == REF_STATUS_REJECT_SHALLOW) {
 626                                if (want_status == FETCH_HEAD_MERGE)
 627                                        warning(_("reject %s because shallow roots are not allowed to be updated"),
 628                                                rm->peer_ref ? rm->peer_ref->name : rm->name);
 629                                continue;
 630                        }
 631
 632                        commit = lookup_commit_reference_gently(rm->old_sha1, 1);
 633                        if (!commit)
 634                                rm->fetch_head_status = FETCH_HEAD_NOT_FOR_MERGE;
 635
 636                        if (rm->fetch_head_status != want_status)
 637                                continue;
 638
 639                        if (rm->peer_ref) {
 640                                ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
 641                                strcpy(ref->name, rm->peer_ref->name);
 642                                hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
 643                                hashcpy(ref->new_sha1, rm->old_sha1);
 644                                ref->force = rm->peer_ref->force;
 645                        }
 646
 647
 648                        if (!strcmp(rm->name, "HEAD")) {
 649                                kind = "";
 650                                what = "";
 651                        }
 652                        else if (starts_with(rm->name, "refs/heads/")) {
 653                                kind = "branch";
 654                                what = rm->name + 11;
 655                        }
 656                        else if (starts_with(rm->name, "refs/tags/")) {
 657                                kind = "tag";
 658                                what = rm->name + 10;
 659                        }
 660                        else if (starts_with(rm->name, "refs/remotes/")) {
 661                                kind = "remote-tracking branch";
 662                                what = rm->name + 13;
 663                        }
 664                        else {
 665                                kind = "";
 666                                what = rm->name;
 667                        }
 668
 669                        url_len = strlen(url);
 670                        for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 671                                ;
 672                        url_len = i + 1;
 673                        if (4 < i && !strncmp(".git", url + i - 3, 4))
 674                                url_len = i - 3;
 675
 676                        strbuf_reset(&note);
 677                        if (*what) {
 678                                if (*kind)
 679                                        strbuf_addf(&note, "%s ", kind);
 680                                strbuf_addf(&note, "'%s' of ", what);
 681                        }
 682                        switch (rm->fetch_head_status) {
 683                        case FETCH_HEAD_NOT_FOR_MERGE:
 684                                merge_status_marker = "not-for-merge";
 685                                /* fall-through */
 686                        case FETCH_HEAD_MERGE:
 687                                fprintf(fp, "%s\t%s\t%s",
 688                                        sha1_to_hex(rm->old_sha1),
 689                                        merge_status_marker,
 690                                        note.buf);
 691                                for (i = 0; i < url_len; ++i)
 692                                        if ('\n' == url[i])
 693                                                fputs("\\n", fp);
 694                                        else
 695                                                fputc(url[i], fp);
 696                                fputc('\n', fp);
 697                                break;
 698                        default:
 699                                /* do not write anything to FETCH_HEAD */
 700                                break;
 701                        }
 702
 703                        strbuf_reset(&note);
 704                        if (ref) {
 705                                rc |= update_local_ref(ref, what, rm, &note);
 706                                free(ref);
 707                        } else
 708                                strbuf_addf(&note, "* %-*s %-*s -> FETCH_HEAD",
 709                                            TRANSPORT_SUMMARY_WIDTH,
 710                                            *kind ? kind : "branch",
 711                                            REFCOL_WIDTH,
 712                                            *what ? what : "HEAD");
 713                        if (note.len) {
 714                                if (verbosity >= 0 && !shown_url) {
 715                                        fprintf(stderr, _("From %.*s\n"),
 716                                                        url_len, url);
 717                                        shown_url = 1;
 718                                }
 719                                if (verbosity >= 0)
 720                                        fprintf(stderr, " %s\n", note.buf);
 721                        }
 722                }
 723        }
 724
 725        if (rc & STORE_REF_ERROR_DF_CONFLICT)
 726                error(_("some local refs could not be updated; try running\n"
 727                      " 'git remote prune %s' to remove any old, conflicting "
 728                      "branches"), remote_name);
 729
 730 abort:
 731        strbuf_release(&note);
 732        free(url);
 733        fclose(fp);
 734        return rc;
 735}
 736
 737/*
 738 * We would want to bypass the object transfer altogether if
 739 * everything we are going to fetch already exists and is connected
 740 * locally.
 741 */
 742static int quickfetch(struct ref *ref_map)
 743{
 744        struct ref *rm = ref_map;
 745
 746        /*
 747         * If we are deepening a shallow clone we already have these
 748         * objects reachable.  Running rev-list here will return with
 749         * a good (0) exit status and we'll bypass the fetch that we
 750         * really need to perform.  Claiming failure now will ensure
 751         * we perform the network exchange to deepen our history.
 752         */
 753        if (depth)
 754                return -1;
 755        return check_everything_connected(iterate_ref_map, 1, &rm);
 756}
 757
 758static int fetch_refs(struct transport *transport, struct ref *ref_map)
 759{
 760        int ret = quickfetch(ref_map);
 761        if (ret)
 762                ret = transport_fetch_refs(transport, ref_map);
 763        if (!ret)
 764                ret |= store_updated_refs(transport->url,
 765                                transport->remote->name,
 766                                ref_map);
 767        transport_unlock_pack(transport);
 768        return ret;
 769}
 770
 771static int prune_refs(struct refspec *refs, int ref_count, struct ref *ref_map,
 772                const char *raw_url)
 773{
 774        int url_len, i, result = 0;
 775        struct ref *ref, *stale_refs = get_stale_heads(refs, ref_count, ref_map);
 776        char *url;
 777        const char *dangling_msg = dry_run
 778                ? _("   (%s will become dangling)")
 779                : _("   (%s has become dangling)");
 780
 781        if (raw_url)
 782                url = transport_anonymize_url(raw_url);
 783        else
 784                url = xstrdup("foreign");
 785
 786        url_len = strlen(url);
 787        for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 788                ;
 789
 790        url_len = i + 1;
 791        if (4 < i && !strncmp(".git", url + i - 3, 4))
 792                url_len = i - 3;
 793
 794        if (!dry_run) {
 795                struct string_list refnames = STRING_LIST_INIT_NODUP;
 796
 797                for (ref = stale_refs; ref; ref = ref->next)
 798                        string_list_append(&refnames, ref->name);
 799
 800                result = delete_refs(&refnames);
 801                string_list_clear(&refnames, 0);
 802        }
 803
 804        if (verbosity >= 0) {
 805                for (ref = stale_refs; ref; ref = ref->next) {
 806                        if (!shown_url) {
 807                                fprintf(stderr, _("From %.*s\n"), url_len, url);
 808                                shown_url = 1;
 809                        }
 810                        fprintf(stderr, " x %-*s %-*s -> %s\n",
 811                                TRANSPORT_SUMMARY(_("[deleted]")),
 812                                REFCOL_WIDTH, _("(none)"), prettify_refname(ref->name));
 813                        warn_dangling_symref(stderr, dangling_msg, ref->name);
 814                }
 815        }
 816
 817        free(url);
 818        free_refs(stale_refs);
 819        return result;
 820}
 821
 822static void check_not_current_branch(struct ref *ref_map)
 823{
 824        struct branch *current_branch = branch_get(NULL);
 825
 826        if (is_bare_repository() || !current_branch)
 827                return;
 828
 829        for (; ref_map; ref_map = ref_map->next)
 830                if (ref_map->peer_ref && !strcmp(current_branch->refname,
 831                                        ref_map->peer_ref->name))
 832                        die(_("Refusing to fetch into current branch %s "
 833                            "of non-bare repository"), current_branch->refname);
 834}
 835
 836static int truncate_fetch_head(void)
 837{
 838        const char *filename = git_path_fetch_head();
 839        FILE *fp = fopen(filename, "w");
 840
 841        if (!fp)
 842                return error(_("cannot open %s: %s\n"), filename, strerror(errno));
 843        fclose(fp);
 844        return 0;
 845}
 846
 847static void set_option(struct transport *transport, const char *name, const char *value)
 848{
 849        int r = transport_set_option(transport, name, value);
 850        if (r < 0)
 851                die(_("Option \"%s\" value \"%s\" is not valid for %s"),
 852                    name, value, transport->url);
 853        if (r > 0)
 854                warning(_("Option \"%s\" is ignored for %s\n"),
 855                        name, transport->url);
 856}
 857
 858static struct transport *prepare_transport(struct remote *remote)
 859{
 860        struct transport *transport;
 861        transport = transport_get(remote, NULL);
 862        transport_set_verbosity(transport, verbosity, progress);
 863        if (upload_pack)
 864                set_option(transport, TRANS_OPT_UPLOADPACK, upload_pack);
 865        if (keep)
 866                set_option(transport, TRANS_OPT_KEEP, "yes");
 867        if (depth)
 868                set_option(transport, TRANS_OPT_DEPTH, depth);
 869        if (update_shallow)
 870                set_option(transport, TRANS_OPT_UPDATE_SHALLOW, "yes");
 871        return transport;
 872}
 873
 874static void backfill_tags(struct transport *transport, struct ref *ref_map)
 875{
 876        if (transport->cannot_reuse) {
 877                gsecondary = prepare_transport(transport->remote);
 878                transport = gsecondary;
 879        }
 880
 881        transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
 882        transport_set_option(transport, TRANS_OPT_DEPTH, "0");
 883        fetch_refs(transport, ref_map);
 884
 885        if (gsecondary) {
 886                transport_disconnect(gsecondary);
 887                gsecondary = NULL;
 888        }
 889}
 890
 891static int do_fetch(struct transport *transport,
 892                    struct refspec *refs, int ref_count)
 893{
 894        struct string_list existing_refs = STRING_LIST_INIT_DUP;
 895        struct ref *ref_map;
 896        struct ref *rm;
 897        int autotags = (transport->remote->fetch_tags == 1);
 898        int retcode = 0;
 899
 900        for_each_ref(add_existing, &existing_refs);
 901
 902        if (tags == TAGS_DEFAULT) {
 903                if (transport->remote->fetch_tags == 2)
 904                        tags = TAGS_SET;
 905                if (transport->remote->fetch_tags == -1)
 906                        tags = TAGS_UNSET;
 907        }
 908
 909        if (!transport->get_refs_list || !transport->fetch)
 910                die(_("Don't know how to fetch from %s"), transport->url);
 911
 912        /* if not appending, truncate FETCH_HEAD */
 913        if (!append && !dry_run) {
 914                retcode = truncate_fetch_head();
 915                if (retcode)
 916                        goto cleanup;
 917        }
 918
 919        ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
 920        if (!update_head_ok)
 921                check_not_current_branch(ref_map);
 922
 923        for (rm = ref_map; rm; rm = rm->next) {
 924                if (rm->peer_ref) {
 925                        struct string_list_item *peer_item =
 926                                string_list_lookup(&existing_refs,
 927                                                   rm->peer_ref->name);
 928                        if (peer_item) {
 929                                struct object_id *old_oid = peer_item->util;
 930                                hashcpy(rm->peer_ref->old_sha1, old_oid->hash);
 931                        }
 932                }
 933        }
 934
 935        if (tags == TAGS_DEFAULT && autotags)
 936                transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
 937        if (prune) {
 938                /*
 939                 * We only prune based on refspecs specified
 940                 * explicitly (via command line or configuration); we
 941                 * don't care whether --tags was specified.
 942                 */
 943                if (ref_count) {
 944                        prune_refs(refs, ref_count, ref_map, transport->url);
 945                } else {
 946                        prune_refs(transport->remote->fetch,
 947                                   transport->remote->fetch_refspec_nr,
 948                                   ref_map,
 949                                   transport->url);
 950                }
 951        }
 952        if (fetch_refs(transport, ref_map)) {
 953                free_refs(ref_map);
 954                retcode = 1;
 955                goto cleanup;
 956        }
 957        free_refs(ref_map);
 958
 959        /* if neither --no-tags nor --tags was specified, do automated tag
 960         * following ... */
 961        if (tags == TAGS_DEFAULT && autotags) {
 962                struct ref **tail = &ref_map;
 963                ref_map = NULL;
 964                find_non_local_tags(transport, &ref_map, &tail);
 965                if (ref_map)
 966                        backfill_tags(transport, ref_map);
 967                free_refs(ref_map);
 968        }
 969
 970 cleanup:
 971        string_list_clear(&existing_refs, 1);
 972        return retcode;
 973}
 974
 975static int get_one_remote_for_fetch(struct remote *remote, void *priv)
 976{
 977        struct string_list *list = priv;
 978        if (!remote->skip_default_update)
 979                string_list_append(list, remote->name);
 980        return 0;
 981}
 982
 983struct remote_group_data {
 984        const char *name;
 985        struct string_list *list;
 986};
 987
 988static int get_remote_group(const char *key, const char *value, void *priv)
 989{
 990        struct remote_group_data *g = priv;
 991
 992        if (skip_prefix(key, "remotes.", &key) && !strcmp(key, g->name)) {
 993                /* split list by white space */
 994                while (*value) {
 995                        size_t wordlen = strcspn(value, " \t\n");
 996
 997                        if (wordlen >= 1)
 998                                string_list_append(g->list,
 999                                                   xstrndup(value, wordlen));
1000                        value += wordlen + (value[wordlen] != '\0');
1001                }
1002        }
1003
1004        return 0;
1005}
1006
1007static int add_remote_or_group(const char *name, struct string_list *list)
1008{
1009        int prev_nr = list->nr;
1010        struct remote_group_data g;
1011        g.name = name; g.list = list;
1012
1013        git_config(get_remote_group, &g);
1014        if (list->nr == prev_nr) {
1015                struct remote *remote;
1016                if (!remote_is_configured(name))
1017                        return 0;
1018                remote = remote_get(name);
1019                string_list_append(list, remote->name);
1020        }
1021        return 1;
1022}
1023
1024static void add_options_to_argv(struct argv_array *argv)
1025{
1026        if (dry_run)
1027                argv_array_push(argv, "--dry-run");
1028        if (prune != -1)
1029                argv_array_push(argv, prune ? "--prune" : "--no-prune");
1030        if (update_head_ok)
1031                argv_array_push(argv, "--update-head-ok");
1032        if (force)
1033                argv_array_push(argv, "--force");
1034        if (keep)
1035                argv_array_push(argv, "--keep");
1036        if (recurse_submodules == RECURSE_SUBMODULES_ON)
1037                argv_array_push(argv, "--recurse-submodules");
1038        else if (recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND)
1039                argv_array_push(argv, "--recurse-submodules=on-demand");
1040        if (tags == TAGS_SET)
1041                argv_array_push(argv, "--tags");
1042        else if (tags == TAGS_UNSET)
1043                argv_array_push(argv, "--no-tags");
1044        if (verbosity >= 2)
1045                argv_array_push(argv, "-v");
1046        if (verbosity >= 1)
1047                argv_array_push(argv, "-v");
1048        else if (verbosity < 0)
1049                argv_array_push(argv, "-q");
1050
1051}
1052
1053static int fetch_multiple(struct string_list *list)
1054{
1055        int i, result = 0;
1056        struct argv_array argv = ARGV_ARRAY_INIT;
1057
1058        if (!append && !dry_run) {
1059                int errcode = truncate_fetch_head();
1060                if (errcode)
1061                        return errcode;
1062        }
1063
1064        argv_array_pushl(&argv, "fetch", "--append", NULL);
1065        add_options_to_argv(&argv);
1066
1067        for (i = 0; i < list->nr; i++) {
1068                const char *name = list->items[i].string;
1069                argv_array_push(&argv, name);
1070                if (verbosity >= 0)
1071                        printf(_("Fetching %s\n"), name);
1072                if (run_command_v_opt(argv.argv, RUN_GIT_CMD)) {
1073                        error(_("Could not fetch %s"), name);
1074                        result = 1;
1075                }
1076                argv_array_pop(&argv);
1077        }
1078
1079        argv_array_clear(&argv);
1080        return result;
1081}
1082
1083static int fetch_one(struct remote *remote, int argc, const char **argv)
1084{
1085        static const char **refs = NULL;
1086        struct refspec *refspec;
1087        int ref_nr = 0;
1088        int exit_code;
1089
1090        if (!remote)
1091                die(_("No remote repository specified.  Please, specify either a URL or a\n"
1092                    "remote name from which new revisions should be fetched."));
1093
1094        gtransport = prepare_transport(remote);
1095
1096        if (prune < 0) {
1097                /* no command line request */
1098                if (0 <= gtransport->remote->prune)
1099                        prune = gtransport->remote->prune;
1100                else if (0 <= fetch_prune_config)
1101                        prune = fetch_prune_config;
1102                else
1103                        prune = PRUNE_BY_DEFAULT;
1104        }
1105
1106        if (argc > 0) {
1107                int j = 0;
1108                int i;
1109                refs = xcalloc(argc + 1, sizeof(const char *));
1110                for (i = 0; i < argc; i++) {
1111                        if (!strcmp(argv[i], "tag")) {
1112                                i++;
1113                                if (i >= argc)
1114                                        die(_("You need to specify a tag name."));
1115                                refs[j++] = xstrfmt("refs/tags/%s:refs/tags/%s",
1116                                                    argv[i], argv[i]);
1117                        } else
1118                                refs[j++] = argv[i];
1119                }
1120                refs[j] = NULL;
1121                ref_nr = j;
1122        }
1123
1124        sigchain_push_common(unlock_pack_on_signal);
1125        atexit(unlock_pack);
1126        refspec = parse_fetch_refspec(ref_nr, refs);
1127        exit_code = do_fetch(gtransport, refspec, ref_nr);
1128        free_refspec(ref_nr, refspec);
1129        transport_disconnect(gtransport);
1130        gtransport = NULL;
1131        return exit_code;
1132}
1133
1134int cmd_fetch(int argc, const char **argv, const char *prefix)
1135{
1136        int i;
1137        struct string_list list = STRING_LIST_INIT_NODUP;
1138        struct remote *remote;
1139        int result = 0;
1140        struct argv_array argv_gc_auto = ARGV_ARRAY_INIT;
1141
1142        packet_trace_identity("fetch");
1143
1144        /* Record the command line for the reflog */
1145        strbuf_addstr(&default_rla, "fetch");
1146        for (i = 1; i < argc; i++)
1147                strbuf_addf(&default_rla, " %s", argv[i]);
1148
1149        git_config(git_fetch_config, NULL);
1150
1151        argc = parse_options(argc, argv, prefix,
1152                             builtin_fetch_options, builtin_fetch_usage, 0);
1153
1154        if (unshallow) {
1155                if (depth)
1156                        die(_("--depth and --unshallow cannot be used together"));
1157                else if (!is_repository_shallow())
1158                        die(_("--unshallow on a complete repository does not make sense"));
1159                else
1160                        depth = xstrfmt("%d", INFINITE_DEPTH);
1161        }
1162
1163        /* no need to be strict, transport_set_option() will validate it again */
1164        if (depth && atoi(depth) < 1)
1165                die(_("depth %s is not a positive number"), depth);
1166
1167        if (recurse_submodules != RECURSE_SUBMODULES_OFF) {
1168                if (recurse_submodules_default) {
1169                        int arg = parse_fetch_recurse_submodules_arg("--recurse-submodules-default", recurse_submodules_default);
1170                        set_config_fetch_recurse_submodules(arg);
1171                }
1172                gitmodules_config();
1173                git_config(submodule_config, NULL);
1174        }
1175
1176        if (all) {
1177                if (argc == 1)
1178                        die(_("fetch --all does not take a repository argument"));
1179                else if (argc > 1)
1180                        die(_("fetch --all does not make sense with refspecs"));
1181                (void) for_each_remote(get_one_remote_for_fetch, &list);
1182                result = fetch_multiple(&list);
1183        } else if (argc == 0) {
1184                /* No arguments -- use default remote */
1185                remote = remote_get(NULL);
1186                result = fetch_one(remote, argc, argv);
1187        } else if (multiple) {
1188                /* All arguments are assumed to be remotes or groups */
1189                for (i = 0; i < argc; i++)
1190                        if (!add_remote_or_group(argv[i], &list))
1191                                die(_("No such remote or remote group: %s"), argv[i]);
1192                result = fetch_multiple(&list);
1193        } else {
1194                /* Single remote or group */
1195                (void) add_remote_or_group(argv[0], &list);
1196                if (list.nr > 1) {
1197                        /* More than one remote */
1198                        if (argc > 1)
1199                                die(_("Fetching a group and specifying refspecs does not make sense"));
1200                        result = fetch_multiple(&list);
1201                } else {
1202                        /* Zero or one remotes */
1203                        remote = remote_get(argv[0]);
1204                        result = fetch_one(remote, argc-1, argv+1);
1205                }
1206        }
1207
1208        if (!result && (recurse_submodules != RECURSE_SUBMODULES_OFF)) {
1209                struct argv_array options = ARGV_ARRAY_INIT;
1210
1211                add_options_to_argv(&options);
1212                result = fetch_populated_submodules(&options,
1213                                                    submodule_prefix,
1214                                                    recurse_submodules,
1215                                                    verbosity < 0);
1216                argv_array_clear(&options);
1217        }
1218
1219        /* All names were strdup()ed or strndup()ed */
1220        list.strdup_strings = 1;
1221        string_list_clear(&list, 0);
1222
1223        argv_array_pushl(&argv_gc_auto, "gc", "--auto", NULL);
1224        if (verbosity < 0)
1225                argv_array_push(&argv_gc_auto, "--quiet");
1226        run_command_v_opt(argv_gc_auto.argv, RUN_GIT_CMD);
1227        argv_array_clear(&argv_gc_auto);
1228
1229        return result;
1230}