f74bd78144b1fb96af74b73cb4e8818047c99d74
   1/*
   2 * "git fetch"
   3 */
   4#include "cache.h"
   5#include "config.h"
   6#include "repository.h"
   7#include "refs.h"
   8#include "refspec.h"
   9#include "object-store.h"
  10#include "commit.h"
  11#include "builtin.h"
  12#include "string-list.h"
  13#include "remote.h"
  14#include "transport.h"
  15#include "run-command.h"
  16#include "parse-options.h"
  17#include "sigchain.h"
  18#include "submodule-config.h"
  19#include "submodule.h"
  20#include "connected.h"
  21#include "argv-array.h"
  22#include "utf8.h"
  23#include "packfile.h"
  24#include "list-objects-filter-options.h"
  25#include "commit-reach.h"
  26#include "promisor-remote.h"
  27
  28static const char * const builtin_fetch_usage[] = {
  29        N_("git fetch [<options>] [<repository> [<refspec>...]]"),
  30        N_("git fetch [<options>] <group>"),
  31        N_("git fetch --multiple [<options>] [(<repository> | <group>)...]"),
  32        N_("git fetch --all [<options>]"),
  33        NULL
  34};
  35
  36enum {
  37        TAGS_UNSET = 0,
  38        TAGS_DEFAULT = 1,
  39        TAGS_SET = 2
  40};
  41
  42static int fetch_prune_config = -1; /* unspecified */
  43static int prune = -1; /* unspecified */
  44#define PRUNE_BY_DEFAULT 0 /* do we prune by default? */
  45
  46static int fetch_prune_tags_config = -1; /* unspecified */
  47static int prune_tags = -1; /* unspecified */
  48#define PRUNE_TAGS_BY_DEFAULT 0 /* do we prune tags by default? */
  49
  50static int all, append, dry_run, force, keep, multiple, update_head_ok, verbosity, deepen_relative;
  51static int progress = -1;
  52static int tags = TAGS_DEFAULT, unshallow, update_shallow, deepen;
  53static int max_children = 1;
  54static enum transport_family family;
  55static const char *depth;
  56static const char *deepen_since;
  57static const char *upload_pack;
  58static struct string_list deepen_not = STRING_LIST_INIT_NODUP;
  59static struct strbuf default_rla = STRBUF_INIT;
  60static struct transport *gtransport;
  61static struct transport *gsecondary;
  62static const char *submodule_prefix = "";
  63static int recurse_submodules = RECURSE_SUBMODULES_DEFAULT;
  64static int recurse_submodules_default = RECURSE_SUBMODULES_ON_DEMAND;
  65static int shown_url = 0;
  66static struct refspec refmap = REFSPEC_INIT_FETCH;
  67static struct list_objects_filter_options filter_options;
  68static struct string_list server_options = STRING_LIST_INIT_DUP;
  69static struct string_list negotiation_tip = STRING_LIST_INIT_NODUP;
  70
  71static int git_fetch_config(const char *k, const char *v, void *cb)
  72{
  73        if (!strcmp(k, "fetch.prune")) {
  74                fetch_prune_config = git_config_bool(k, v);
  75                return 0;
  76        }
  77
  78        if (!strcmp(k, "fetch.prunetags")) {
  79                fetch_prune_tags_config = git_config_bool(k, v);
  80                return 0;
  81        }
  82
  83        if (!strcmp(k, "submodule.recurse")) {
  84                int r = git_config_bool(k, v) ?
  85                        RECURSE_SUBMODULES_ON : RECURSE_SUBMODULES_OFF;
  86                recurse_submodules = r;
  87        }
  88
  89        if (!strcmp(k, "submodule.fetchjobs")) {
  90                max_children = parse_submodule_fetchjobs(k, v);
  91                return 0;
  92        } else if (!strcmp(k, "fetch.recursesubmodules")) {
  93                recurse_submodules = parse_fetch_recurse_submodules_arg(k, v);
  94                return 0;
  95        }
  96
  97        return git_default_config(k, v, cb);
  98}
  99
 100static int parse_refmap_arg(const struct option *opt, const char *arg, int unset)
 101{
 102        BUG_ON_OPT_NEG(unset);
 103
 104        /*
 105         * "git fetch --refmap='' origin foo"
 106         * can be used to tell the command not to store anywhere
 107         */
 108        refspec_append(&refmap, arg);
 109
 110        return 0;
 111}
 112
 113static struct option builtin_fetch_options[] = {
 114        OPT__VERBOSITY(&verbosity),
 115        OPT_BOOL(0, "all", &all,
 116                 N_("fetch from all remotes")),
 117        OPT_BOOL('a', "append", &append,
 118                 N_("append to .git/FETCH_HEAD instead of overwriting")),
 119        OPT_STRING(0, "upload-pack", &upload_pack, N_("path"),
 120                   N_("path to upload pack on remote end")),
 121        OPT__FORCE(&force, N_("force overwrite of local reference"), 0),
 122        OPT_BOOL('m', "multiple", &multiple,
 123                 N_("fetch from multiple remotes")),
 124        OPT_SET_INT('t', "tags", &tags,
 125                    N_("fetch all tags and associated objects"), TAGS_SET),
 126        OPT_SET_INT('n', NULL, &tags,
 127                    N_("do not fetch all tags (--no-tags)"), TAGS_UNSET),
 128        OPT_INTEGER('j', "jobs", &max_children,
 129                    N_("number of submodules fetched in parallel")),
 130        OPT_BOOL('p', "prune", &prune,
 131                 N_("prune remote-tracking branches no longer on remote")),
 132        OPT_BOOL('P', "prune-tags", &prune_tags,
 133                 N_("prune local tags no longer on remote and clobber changed tags")),
 134        { OPTION_CALLBACK, 0, "recurse-submodules", &recurse_submodules, N_("on-demand"),
 135                    N_("control recursive fetching of submodules"),
 136                    PARSE_OPT_OPTARG, option_fetch_parse_recurse_submodules },
 137        OPT_BOOL(0, "dry-run", &dry_run,
 138                 N_("dry run")),
 139        OPT_BOOL('k', "keep", &keep, N_("keep downloaded pack")),
 140        OPT_BOOL('u', "update-head-ok", &update_head_ok,
 141                    N_("allow updating of HEAD ref")),
 142        OPT_BOOL(0, "progress", &progress, N_("force progress reporting")),
 143        OPT_STRING(0, "depth", &depth, N_("depth"),
 144                   N_("deepen history of shallow clone")),
 145        OPT_STRING(0, "shallow-since", &deepen_since, N_("time"),
 146                   N_("deepen history of shallow repository based on time")),
 147        OPT_STRING_LIST(0, "shallow-exclude", &deepen_not, N_("revision"),
 148                        N_("deepen history of shallow clone, excluding rev")),
 149        OPT_INTEGER(0, "deepen", &deepen_relative,
 150                    N_("deepen history of shallow clone")),
 151        OPT_SET_INT_F(0, "unshallow", &unshallow,
 152                      N_("convert to a complete repository"),
 153                      1, PARSE_OPT_NONEG),
 154        { OPTION_STRING, 0, "submodule-prefix", &submodule_prefix, N_("dir"),
 155                   N_("prepend this to submodule path output"), PARSE_OPT_HIDDEN },
 156        { OPTION_CALLBACK, 0, "recurse-submodules-default",
 157                   &recurse_submodules_default, N_("on-demand"),
 158                   N_("default for recursive fetching of submodules "
 159                      "(lower priority than config files)"),
 160                   PARSE_OPT_HIDDEN, option_fetch_parse_recurse_submodules },
 161        OPT_BOOL(0, "update-shallow", &update_shallow,
 162                 N_("accept refs that update .git/shallow")),
 163        { OPTION_CALLBACK, 0, "refmap", NULL, N_("refmap"),
 164          N_("specify fetch refmap"), PARSE_OPT_NONEG, parse_refmap_arg },
 165        OPT_STRING_LIST('o', "server-option", &server_options, N_("server-specific"), N_("option to transmit")),
 166        OPT_SET_INT('4', "ipv4", &family, N_("use IPv4 addresses only"),
 167                        TRANSPORT_FAMILY_IPV4),
 168        OPT_SET_INT('6', "ipv6", &family, N_("use IPv6 addresses only"),
 169                        TRANSPORT_FAMILY_IPV6),
 170        OPT_STRING_LIST(0, "negotiation-tip", &negotiation_tip, N_("revision"),
 171                        N_("report that we have only objects reachable from this object")),
 172        OPT_PARSE_LIST_OBJECTS_FILTER(&filter_options),
 173        OPT_END()
 174};
 175
 176static void unlock_pack(void)
 177{
 178        if (gtransport)
 179                transport_unlock_pack(gtransport);
 180        if (gsecondary)
 181                transport_unlock_pack(gsecondary);
 182}
 183
 184static void unlock_pack_on_signal(int signo)
 185{
 186        unlock_pack();
 187        sigchain_pop(signo);
 188        raise(signo);
 189}
 190
 191static void add_merge_config(struct ref **head,
 192                           const struct ref *remote_refs,
 193                           struct branch *branch,
 194                           struct ref ***tail)
 195{
 196        int i;
 197
 198        for (i = 0; i < branch->merge_nr; i++) {
 199                struct ref *rm, **old_tail = *tail;
 200                struct refspec_item refspec;
 201
 202                for (rm = *head; rm; rm = rm->next) {
 203                        if (branch_merge_matches(branch, i, rm->name)) {
 204                                rm->fetch_head_status = FETCH_HEAD_MERGE;
 205                                break;
 206                        }
 207                }
 208                if (rm)
 209                        continue;
 210
 211                /*
 212                 * Not fetched to a remote-tracking branch?  We need to fetch
 213                 * it anyway to allow this branch's "branch.$name.merge"
 214                 * to be honored by 'git pull', but we do not have to
 215                 * fail if branch.$name.merge is misconfigured to point
 216                 * at a nonexisting branch.  If we were indeed called by
 217                 * 'git pull', it will notice the misconfiguration because
 218                 * there is no entry in the resulting FETCH_HEAD marked
 219                 * for merging.
 220                 */
 221                memset(&refspec, 0, sizeof(refspec));
 222                refspec.src = branch->merge[i]->src;
 223                get_fetch_map(remote_refs, &refspec, tail, 1);
 224                for (rm = *old_tail; rm; rm = rm->next)
 225                        rm->fetch_head_status = FETCH_HEAD_MERGE;
 226        }
 227}
 228
 229static int will_fetch(struct ref **head, const unsigned char *sha1)
 230{
 231        struct ref *rm = *head;
 232        while (rm) {
 233                if (hasheq(rm->old_oid.hash, sha1))
 234                        return 1;
 235                rm = rm->next;
 236        }
 237        return 0;
 238}
 239
 240struct refname_hash_entry {
 241        struct hashmap_entry ent; /* must be the first member */
 242        struct object_id oid;
 243        char refname[FLEX_ARRAY];
 244};
 245
 246static int refname_hash_entry_cmp(const void *hashmap_cmp_fn_data,
 247                                  const void *e1_,
 248                                  const void *e2_,
 249                                  const void *keydata)
 250{
 251        const struct refname_hash_entry *e1 = e1_;
 252        const struct refname_hash_entry *e2 = e2_;
 253
 254        return strcmp(e1->refname, keydata ? keydata : e2->refname);
 255}
 256
 257static struct refname_hash_entry *refname_hash_add(struct hashmap *map,
 258                                                   const char *refname,
 259                                                   const struct object_id *oid)
 260{
 261        struct refname_hash_entry *ent;
 262        size_t len = strlen(refname);
 263
 264        FLEX_ALLOC_MEM(ent, refname, refname, len);
 265        hashmap_entry_init(ent, strhash(refname));
 266        oidcpy(&ent->oid, oid);
 267        hashmap_add(map, ent);
 268        return ent;
 269}
 270
 271static int add_one_refname(const char *refname,
 272                           const struct object_id *oid,
 273                           int flag, void *cbdata)
 274{
 275        struct hashmap *refname_map = cbdata;
 276
 277        (void) refname_hash_add(refname_map, refname, oid);
 278        return 0;
 279}
 280
 281static void refname_hash_init(struct hashmap *map)
 282{
 283        hashmap_init(map, refname_hash_entry_cmp, NULL, 0);
 284}
 285
 286static int refname_hash_exists(struct hashmap *map, const char *refname)
 287{
 288        return !!hashmap_get_from_hash(map, strhash(refname), refname);
 289}
 290
 291static void find_non_local_tags(const struct ref *refs,
 292                                struct ref **head,
 293                                struct ref ***tail)
 294{
 295        struct hashmap existing_refs;
 296        struct hashmap remote_refs;
 297        struct string_list remote_refs_list = STRING_LIST_INIT_NODUP;
 298        struct string_list_item *remote_ref_item;
 299        const struct ref *ref;
 300        struct refname_hash_entry *item = NULL;
 301
 302        refname_hash_init(&existing_refs);
 303        refname_hash_init(&remote_refs);
 304
 305        for_each_ref(add_one_refname, &existing_refs);
 306        for (ref = refs; ref; ref = ref->next) {
 307                if (!starts_with(ref->name, "refs/tags/"))
 308                        continue;
 309
 310                /*
 311                 * The peeled ref always follows the matching base
 312                 * ref, so if we see a peeled ref that we don't want
 313                 * to fetch then we can mark the ref entry in the list
 314                 * as one to ignore by setting util to NULL.
 315                 */
 316                if (ends_with(ref->name, "^{}")) {
 317                        if (item &&
 318                            !has_object_file_with_flags(&ref->old_oid,
 319                                                        OBJECT_INFO_QUICK) &&
 320                            !will_fetch(head, ref->old_oid.hash) &&
 321                            !has_object_file_with_flags(&item->oid, OBJECT_INFO_QUICK) &&
 322                            !will_fetch(head, item->oid.hash))
 323                                oidclr(&item->oid);
 324                        item = NULL;
 325                        continue;
 326                }
 327
 328                /*
 329                 * If item is non-NULL here, then we previously saw a
 330                 * ref not followed by a peeled reference, so we need
 331                 * to check if it is a lightweight tag that we want to
 332                 * fetch.
 333                 */
 334                if (item &&
 335                    !has_object_file_with_flags(&item->oid, OBJECT_INFO_QUICK) &&
 336                    !will_fetch(head, item->oid.hash))
 337                        oidclr(&item->oid);
 338
 339                item = NULL;
 340
 341                /* skip duplicates and refs that we already have */
 342                if (refname_hash_exists(&remote_refs, ref->name) ||
 343                    refname_hash_exists(&existing_refs, ref->name))
 344                        continue;
 345
 346                item = refname_hash_add(&remote_refs, ref->name, &ref->old_oid);
 347                string_list_insert(&remote_refs_list, ref->name);
 348        }
 349        hashmap_free(&existing_refs, 1);
 350
 351        /*
 352         * We may have a final lightweight tag that needs to be
 353         * checked to see if it needs fetching.
 354         */
 355        if (item &&
 356            !has_object_file_with_flags(&item->oid, OBJECT_INFO_QUICK) &&
 357            !will_fetch(head, item->oid.hash))
 358                oidclr(&item->oid);
 359
 360        /*
 361         * For all the tags in the remote_refs_list,
 362         * add them to the list of refs to be fetched
 363         */
 364        for_each_string_list_item(remote_ref_item, &remote_refs_list) {
 365                const char *refname = remote_ref_item->string;
 366
 367                item = hashmap_get_from_hash(&remote_refs, strhash(refname), refname);
 368                if (!item)
 369                        BUG("unseen remote ref?");
 370
 371                /* Unless we have already decided to ignore this item... */
 372                if (!is_null_oid(&item->oid)) {
 373                        struct ref *rm = alloc_ref(item->refname);
 374                        rm->peer_ref = alloc_ref(item->refname);
 375                        oidcpy(&rm->old_oid, &item->oid);
 376                        **tail = rm;
 377                        *tail = &rm->next;
 378                }
 379        }
 380        hashmap_free(&remote_refs, 1);
 381        string_list_clear(&remote_refs_list, 0);
 382}
 383
 384static struct ref *get_ref_map(struct remote *remote,
 385                               const struct ref *remote_refs,
 386                               struct refspec *rs,
 387                               int tags, int *autotags)
 388{
 389        int i;
 390        struct ref *rm;
 391        struct ref *ref_map = NULL;
 392        struct ref **tail = &ref_map;
 393
 394        /* opportunistically-updated references: */
 395        struct ref *orefs = NULL, **oref_tail = &orefs;
 396
 397        struct hashmap existing_refs;
 398
 399        if (rs->nr) {
 400                struct refspec *fetch_refspec;
 401
 402                for (i = 0; i < rs->nr; i++) {
 403                        get_fetch_map(remote_refs, &rs->items[i], &tail, 0);
 404                        if (rs->items[i].dst && rs->items[i].dst[0])
 405                                *autotags = 1;
 406                }
 407                /* Merge everything on the command line (but not --tags) */
 408                for (rm = ref_map; rm; rm = rm->next)
 409                        rm->fetch_head_status = FETCH_HEAD_MERGE;
 410
 411                /*
 412                 * For any refs that we happen to be fetching via
 413                 * command-line arguments, the destination ref might
 414                 * have been missing or have been different than the
 415                 * remote-tracking ref that would be derived from the
 416                 * configured refspec.  In these cases, we want to
 417                 * take the opportunity to update their configured
 418                 * remote-tracking reference.  However, we do not want
 419                 * to mention these entries in FETCH_HEAD at all, as
 420                 * they would simply be duplicates of existing
 421                 * entries, so we set them FETCH_HEAD_IGNORE below.
 422                 *
 423                 * We compute these entries now, based only on the
 424                 * refspecs specified on the command line.  But we add
 425                 * them to the list following the refspecs resulting
 426                 * from the tags option so that one of the latter,
 427                 * which has FETCH_HEAD_NOT_FOR_MERGE, is not removed
 428                 * by ref_remove_duplicates() in favor of one of these
 429                 * opportunistic entries with FETCH_HEAD_IGNORE.
 430                 */
 431                if (refmap.nr)
 432                        fetch_refspec = &refmap;
 433                else
 434                        fetch_refspec = &remote->fetch;
 435
 436                for (i = 0; i < fetch_refspec->nr; i++)
 437                        get_fetch_map(ref_map, &fetch_refspec->items[i], &oref_tail, 1);
 438        } else if (refmap.nr) {
 439                die("--refmap option is only meaningful with command-line refspec(s).");
 440        } else {
 441                /* Use the defaults */
 442                struct branch *branch = branch_get(NULL);
 443                int has_merge = branch_has_merge_config(branch);
 444                if (remote &&
 445                    (remote->fetch.nr ||
 446                     /* Note: has_merge implies non-NULL branch->remote_name */
 447                     (has_merge && !strcmp(branch->remote_name, remote->name)))) {
 448                        for (i = 0; i < remote->fetch.nr; i++) {
 449                                get_fetch_map(remote_refs, &remote->fetch.items[i], &tail, 0);
 450                                if (remote->fetch.items[i].dst &&
 451                                    remote->fetch.items[i].dst[0])
 452                                        *autotags = 1;
 453                                if (!i && !has_merge && ref_map &&
 454                                    !remote->fetch.items[0].pattern)
 455                                        ref_map->fetch_head_status = FETCH_HEAD_MERGE;
 456                        }
 457                        /*
 458                         * if the remote we're fetching from is the same
 459                         * as given in branch.<name>.remote, we add the
 460                         * ref given in branch.<name>.merge, too.
 461                         *
 462                         * Note: has_merge implies non-NULL branch->remote_name
 463                         */
 464                        if (has_merge &&
 465                            !strcmp(branch->remote_name, remote->name))
 466                                add_merge_config(&ref_map, remote_refs, branch, &tail);
 467                } else {
 468                        ref_map = get_remote_ref(remote_refs, "HEAD");
 469                        if (!ref_map)
 470                                die(_("Couldn't find remote ref HEAD"));
 471                        ref_map->fetch_head_status = FETCH_HEAD_MERGE;
 472                        tail = &ref_map->next;
 473                }
 474        }
 475
 476        if (tags == TAGS_SET)
 477                /* also fetch all tags */
 478                get_fetch_map(remote_refs, tag_refspec, &tail, 0);
 479        else if (tags == TAGS_DEFAULT && *autotags)
 480                find_non_local_tags(remote_refs, &ref_map, &tail);
 481
 482        /* Now append any refs to be updated opportunistically: */
 483        *tail = orefs;
 484        for (rm = orefs; rm; rm = rm->next) {
 485                rm->fetch_head_status = FETCH_HEAD_IGNORE;
 486                tail = &rm->next;
 487        }
 488
 489        ref_map = ref_remove_duplicates(ref_map);
 490
 491        refname_hash_init(&existing_refs);
 492        for_each_ref(add_one_refname, &existing_refs);
 493
 494        for (rm = ref_map; rm; rm = rm->next) {
 495                if (rm->peer_ref) {
 496                        const char *refname = rm->peer_ref->name;
 497                        struct refname_hash_entry *peer_item;
 498
 499                        peer_item = hashmap_get_from_hash(&existing_refs,
 500                                                          strhash(refname),
 501                                                          refname);
 502                        if (peer_item) {
 503                                struct object_id *old_oid = &peer_item->oid;
 504                                oidcpy(&rm->peer_ref->old_oid, old_oid);
 505                        }
 506                }
 507        }
 508        hashmap_free(&existing_refs, 1);
 509
 510        return ref_map;
 511}
 512
 513#define STORE_REF_ERROR_OTHER 1
 514#define STORE_REF_ERROR_DF_CONFLICT 2
 515
 516static int s_update_ref(const char *action,
 517                        struct ref *ref,
 518                        int check_old)
 519{
 520        char *msg;
 521        char *rla = getenv("GIT_REFLOG_ACTION");
 522        struct ref_transaction *transaction;
 523        struct strbuf err = STRBUF_INIT;
 524        int ret, df_conflict = 0;
 525
 526        if (dry_run)
 527                return 0;
 528        if (!rla)
 529                rla = default_rla.buf;
 530        msg = xstrfmt("%s: %s", rla, action);
 531
 532        transaction = ref_transaction_begin(&err);
 533        if (!transaction ||
 534            ref_transaction_update(transaction, ref->name,
 535                                   &ref->new_oid,
 536                                   check_old ? &ref->old_oid : NULL,
 537                                   0, msg, &err))
 538                goto fail;
 539
 540        ret = ref_transaction_commit(transaction, &err);
 541        if (ret) {
 542                df_conflict = (ret == TRANSACTION_NAME_CONFLICT);
 543                goto fail;
 544        }
 545
 546        ref_transaction_free(transaction);
 547        strbuf_release(&err);
 548        free(msg);
 549        return 0;
 550fail:
 551        ref_transaction_free(transaction);
 552        error("%s", err.buf);
 553        strbuf_release(&err);
 554        free(msg);
 555        return df_conflict ? STORE_REF_ERROR_DF_CONFLICT
 556                           : STORE_REF_ERROR_OTHER;
 557}
 558
 559static int refcol_width = 10;
 560static int compact_format;
 561
 562static void adjust_refcol_width(const struct ref *ref)
 563{
 564        int max, rlen, llen, len;
 565
 566        /* uptodate lines are only shown on high verbosity level */
 567        if (!verbosity && oideq(&ref->peer_ref->old_oid, &ref->old_oid))
 568                return;
 569
 570        max    = term_columns();
 571        rlen   = utf8_strwidth(prettify_refname(ref->name));
 572
 573        llen   = utf8_strwidth(prettify_refname(ref->peer_ref->name));
 574
 575        /*
 576         * rough estimation to see if the output line is too long and
 577         * should not be counted (we can't do precise calculation
 578         * anyway because we don't know if the error explanation part
 579         * will be printed in update_local_ref)
 580         */
 581        if (compact_format) {
 582                llen = 0;
 583                max = max * 2 / 3;
 584        }
 585        len = 21 /* flag and summary */ + rlen + 4 /* -> */ + llen;
 586        if (len >= max)
 587                return;
 588
 589        /*
 590         * Not precise calculation for compact mode because '*' can
 591         * appear on the left hand side of '->' and shrink the column
 592         * back.
 593         */
 594        if (refcol_width < rlen)
 595                refcol_width = rlen;
 596}
 597
 598static void prepare_format_display(struct ref *ref_map)
 599{
 600        struct ref *rm;
 601        const char *format = "full";
 602
 603        git_config_get_string_const("fetch.output", &format);
 604        if (!strcasecmp(format, "full"))
 605                compact_format = 0;
 606        else if (!strcasecmp(format, "compact"))
 607                compact_format = 1;
 608        else
 609                die(_("configuration fetch.output contains invalid value %s"),
 610                    format);
 611
 612        for (rm = ref_map; rm; rm = rm->next) {
 613                if (rm->status == REF_STATUS_REJECT_SHALLOW ||
 614                    !rm->peer_ref ||
 615                    !strcmp(rm->name, "HEAD"))
 616                        continue;
 617
 618                adjust_refcol_width(rm);
 619        }
 620}
 621
 622static void print_remote_to_local(struct strbuf *display,
 623                                  const char *remote, const char *local)
 624{
 625        strbuf_addf(display, "%-*s -> %s", refcol_width, remote, local);
 626}
 627
 628static int find_and_replace(struct strbuf *haystack,
 629                            const char *needle,
 630                            const char *placeholder)
 631{
 632        const char *p = NULL;
 633        int plen, nlen;
 634
 635        nlen = strlen(needle);
 636        if (ends_with(haystack->buf, needle))
 637                p = haystack->buf + haystack->len - nlen;
 638        else
 639                p = strstr(haystack->buf, needle);
 640        if (!p)
 641                return 0;
 642
 643        if (p > haystack->buf && p[-1] != '/')
 644                return 0;
 645
 646        plen = strlen(p);
 647        if (plen > nlen && p[nlen] != '/')
 648                return 0;
 649
 650        strbuf_splice(haystack, p - haystack->buf, nlen,
 651                      placeholder, strlen(placeholder));
 652        return 1;
 653}
 654
 655static void print_compact(struct strbuf *display,
 656                          const char *remote, const char *local)
 657{
 658        struct strbuf r = STRBUF_INIT;
 659        struct strbuf l = STRBUF_INIT;
 660
 661        if (!strcmp(remote, local)) {
 662                strbuf_addf(display, "%-*s -> *", refcol_width, remote);
 663                return;
 664        }
 665
 666        strbuf_addstr(&r, remote);
 667        strbuf_addstr(&l, local);
 668
 669        if (!find_and_replace(&r, local, "*"))
 670                find_and_replace(&l, remote, "*");
 671        print_remote_to_local(display, r.buf, l.buf);
 672
 673        strbuf_release(&r);
 674        strbuf_release(&l);
 675}
 676
 677static void format_display(struct strbuf *display, char code,
 678                           const char *summary, const char *error,
 679                           const char *remote, const char *local,
 680                           int summary_width)
 681{
 682        int width = (summary_width + strlen(summary) - gettext_width(summary));
 683
 684        strbuf_addf(display, "%c %-*s ", code, width, summary);
 685        if (!compact_format)
 686                print_remote_to_local(display, remote, local);
 687        else
 688                print_compact(display, remote, local);
 689        if (error)
 690                strbuf_addf(display, "  (%s)", error);
 691}
 692
 693static int update_local_ref(struct ref *ref,
 694                            const char *remote,
 695                            const struct ref *remote_ref,
 696                            struct strbuf *display,
 697                            int summary_width)
 698{
 699        struct commit *current = NULL, *updated;
 700        enum object_type type;
 701        struct branch *current_branch = branch_get(NULL);
 702        const char *pretty_ref = prettify_refname(ref->name);
 703
 704        type = oid_object_info(the_repository, &ref->new_oid, NULL);
 705        if (type < 0)
 706                die(_("object %s not found"), oid_to_hex(&ref->new_oid));
 707
 708        if (oideq(&ref->old_oid, &ref->new_oid)) {
 709                if (verbosity > 0)
 710                        format_display(display, '=', _("[up to date]"), NULL,
 711                                       remote, pretty_ref, summary_width);
 712                return 0;
 713        }
 714
 715        if (current_branch &&
 716            !strcmp(ref->name, current_branch->name) &&
 717            !(update_head_ok || is_bare_repository()) &&
 718            !is_null_oid(&ref->old_oid)) {
 719                /*
 720                 * If this is the head, and it's not okay to update
 721                 * the head, and the old value of the head isn't empty...
 722                 */
 723                format_display(display, '!', _("[rejected]"),
 724                               _("can't fetch in current branch"),
 725                               remote, pretty_ref, summary_width);
 726                return 1;
 727        }
 728
 729        if (!is_null_oid(&ref->old_oid) &&
 730            starts_with(ref->name, "refs/tags/")) {
 731                if (force || ref->force) {
 732                        int r;
 733                        r = s_update_ref("updating tag", ref, 0);
 734                        format_display(display, r ? '!' : 't', _("[tag update]"),
 735                                       r ? _("unable to update local ref") : NULL,
 736                                       remote, pretty_ref, summary_width);
 737                        return r;
 738                } else {
 739                        format_display(display, '!', _("[rejected]"), _("would clobber existing tag"),
 740                                       remote, pretty_ref, summary_width);
 741                        return 1;
 742                }
 743        }
 744
 745        current = lookup_commit_reference_gently(the_repository,
 746                                                 &ref->old_oid, 1);
 747        updated = lookup_commit_reference_gently(the_repository,
 748                                                 &ref->new_oid, 1);
 749        if (!current || !updated) {
 750                const char *msg;
 751                const char *what;
 752                int r;
 753                /*
 754                 * Nicely describe the new ref we're fetching.
 755                 * Base this on the remote's ref name, as it's
 756                 * more likely to follow a standard layout.
 757                 */
 758                const char *name = remote_ref ? remote_ref->name : "";
 759                if (starts_with(name, "refs/tags/")) {
 760                        msg = "storing tag";
 761                        what = _("[new tag]");
 762                } else if (starts_with(name, "refs/heads/")) {
 763                        msg = "storing head";
 764                        what = _("[new branch]");
 765                } else {
 766                        msg = "storing ref";
 767                        what = _("[new ref]");
 768                }
 769
 770                r = s_update_ref(msg, ref, 0);
 771                format_display(display, r ? '!' : '*', what,
 772                               r ? _("unable to update local ref") : NULL,
 773                               remote, pretty_ref, summary_width);
 774                return r;
 775        }
 776
 777        if (in_merge_bases(current, updated)) {
 778                struct strbuf quickref = STRBUF_INIT;
 779                int r;
 780                strbuf_add_unique_abbrev(&quickref, &current->object.oid, DEFAULT_ABBREV);
 781                strbuf_addstr(&quickref, "..");
 782                strbuf_add_unique_abbrev(&quickref, &ref->new_oid, DEFAULT_ABBREV);
 783                r = s_update_ref("fast-forward", ref, 1);
 784                format_display(display, r ? '!' : ' ', quickref.buf,
 785                               r ? _("unable to update local ref") : NULL,
 786                               remote, pretty_ref, summary_width);
 787                strbuf_release(&quickref);
 788                return r;
 789        } else if (force || ref->force) {
 790                struct strbuf quickref = STRBUF_INIT;
 791                int r;
 792                strbuf_add_unique_abbrev(&quickref, &current->object.oid, DEFAULT_ABBREV);
 793                strbuf_addstr(&quickref, "...");
 794                strbuf_add_unique_abbrev(&quickref, &ref->new_oid, DEFAULT_ABBREV);
 795                r = s_update_ref("forced-update", ref, 1);
 796                format_display(display, r ? '!' : '+', quickref.buf,
 797                               r ? _("unable to update local ref") : _("forced update"),
 798                               remote, pretty_ref, summary_width);
 799                strbuf_release(&quickref);
 800                return r;
 801        } else {
 802                format_display(display, '!', _("[rejected]"), _("non-fast-forward"),
 803                               remote, pretty_ref, summary_width);
 804                return 1;
 805        }
 806}
 807
 808static int iterate_ref_map(void *cb_data, struct object_id *oid)
 809{
 810        struct ref **rm = cb_data;
 811        struct ref *ref = *rm;
 812
 813        while (ref && ref->status == REF_STATUS_REJECT_SHALLOW)
 814                ref = ref->next;
 815        if (!ref)
 816                return -1; /* end of the list */
 817        *rm = ref->next;
 818        oidcpy(oid, &ref->old_oid);
 819        return 0;
 820}
 821
 822static int store_updated_refs(const char *raw_url, const char *remote_name,
 823                              int connectivity_checked, struct ref *ref_map)
 824{
 825        FILE *fp;
 826        struct commit *commit;
 827        int url_len, i, rc = 0;
 828        struct strbuf note = STRBUF_INIT;
 829        const char *what, *kind;
 830        struct ref *rm;
 831        char *url;
 832        const char *filename = dry_run ? "/dev/null" : git_path_fetch_head(the_repository);
 833        int want_status;
 834        int summary_width = transport_summary_width(ref_map);
 835
 836        fp = fopen(filename, "a");
 837        if (!fp)
 838                return error_errno(_("cannot open %s"), filename);
 839
 840        if (raw_url)
 841                url = transport_anonymize_url(raw_url);
 842        else
 843                url = xstrdup("foreign");
 844
 845        if (!connectivity_checked) {
 846                rm = ref_map;
 847                if (check_connected(iterate_ref_map, &rm, NULL)) {
 848                        rc = error(_("%s did not send all necessary objects\n"), url);
 849                        goto abort;
 850                }
 851        }
 852
 853        prepare_format_display(ref_map);
 854
 855        /*
 856         * We do a pass for each fetch_head_status type in their enum order, so
 857         * merged entries are written before not-for-merge. That lets readers
 858         * use FETCH_HEAD as a refname to refer to the ref to be merged.
 859         */
 860        for (want_status = FETCH_HEAD_MERGE;
 861             want_status <= FETCH_HEAD_IGNORE;
 862             want_status++) {
 863                for (rm = ref_map; rm; rm = rm->next) {
 864                        struct ref *ref = NULL;
 865                        const char *merge_status_marker = "";
 866
 867                        if (rm->status == REF_STATUS_REJECT_SHALLOW) {
 868                                if (want_status == FETCH_HEAD_MERGE)
 869                                        warning(_("reject %s because shallow roots are not allowed to be updated"),
 870                                                rm->peer_ref ? rm->peer_ref->name : rm->name);
 871                                continue;
 872                        }
 873
 874                        commit = lookup_commit_reference_gently(the_repository,
 875                                                                &rm->old_oid,
 876                                                                1);
 877                        if (!commit)
 878                                rm->fetch_head_status = FETCH_HEAD_NOT_FOR_MERGE;
 879
 880                        if (rm->fetch_head_status != want_status)
 881                                continue;
 882
 883                        if (rm->peer_ref) {
 884                                ref = alloc_ref(rm->peer_ref->name);
 885                                oidcpy(&ref->old_oid, &rm->peer_ref->old_oid);
 886                                oidcpy(&ref->new_oid, &rm->old_oid);
 887                                ref->force = rm->peer_ref->force;
 888                        }
 889
 890                        if (recurse_submodules != RECURSE_SUBMODULES_OFF)
 891                                check_for_new_submodule_commits(&rm->old_oid);
 892
 893                        if (!strcmp(rm->name, "HEAD")) {
 894                                kind = "";
 895                                what = "";
 896                        }
 897                        else if (starts_with(rm->name, "refs/heads/")) {
 898                                kind = "branch";
 899                                what = rm->name + 11;
 900                        }
 901                        else if (starts_with(rm->name, "refs/tags/")) {
 902                                kind = "tag";
 903                                what = rm->name + 10;
 904                        }
 905                        else if (starts_with(rm->name, "refs/remotes/")) {
 906                                kind = "remote-tracking branch";
 907                                what = rm->name + 13;
 908                        }
 909                        else {
 910                                kind = "";
 911                                what = rm->name;
 912                        }
 913
 914                        url_len = strlen(url);
 915                        for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 916                                ;
 917                        url_len = i + 1;
 918                        if (4 < i && !strncmp(".git", url + i - 3, 4))
 919                                url_len = i - 3;
 920
 921                        strbuf_reset(&note);
 922                        if (*what) {
 923                                if (*kind)
 924                                        strbuf_addf(&note, "%s ", kind);
 925                                strbuf_addf(&note, "'%s' of ", what);
 926                        }
 927                        switch (rm->fetch_head_status) {
 928                        case FETCH_HEAD_NOT_FOR_MERGE:
 929                                merge_status_marker = "not-for-merge";
 930                                /* fall-through */
 931                        case FETCH_HEAD_MERGE:
 932                                fprintf(fp, "%s\t%s\t%s",
 933                                        oid_to_hex(&rm->old_oid),
 934                                        merge_status_marker,
 935                                        note.buf);
 936                                for (i = 0; i < url_len; ++i)
 937                                        if ('\n' == url[i])
 938                                                fputs("\\n", fp);
 939                                        else
 940                                                fputc(url[i], fp);
 941                                fputc('\n', fp);
 942                                break;
 943                        default:
 944                                /* do not write anything to FETCH_HEAD */
 945                                break;
 946                        }
 947
 948                        strbuf_reset(&note);
 949                        if (ref) {
 950                                rc |= update_local_ref(ref, what, rm, &note,
 951                                                       summary_width);
 952                                free(ref);
 953                        } else
 954                                format_display(&note, '*',
 955                                               *kind ? kind : "branch", NULL,
 956                                               *what ? what : "HEAD",
 957                                               "FETCH_HEAD", summary_width);
 958                        if (note.len) {
 959                                if (verbosity >= 0 && !shown_url) {
 960                                        fprintf(stderr, _("From %.*s\n"),
 961                                                        url_len, url);
 962                                        shown_url = 1;
 963                                }
 964                                if (verbosity >= 0)
 965                                        fprintf(stderr, " %s\n", note.buf);
 966                        }
 967                }
 968        }
 969
 970        if (rc & STORE_REF_ERROR_DF_CONFLICT)
 971                error(_("some local refs could not be updated; try running\n"
 972                      " 'git remote prune %s' to remove any old, conflicting "
 973                      "branches"), remote_name);
 974
 975 abort:
 976        strbuf_release(&note);
 977        free(url);
 978        fclose(fp);
 979        return rc;
 980}
 981
 982/*
 983 * We would want to bypass the object transfer altogether if
 984 * everything we are going to fetch already exists and is connected
 985 * locally.
 986 */
 987static int check_exist_and_connected(struct ref *ref_map)
 988{
 989        struct ref *rm = ref_map;
 990        struct check_connected_options opt = CHECK_CONNECTED_INIT;
 991        struct ref *r;
 992
 993        /*
 994         * If we are deepening a shallow clone we already have these
 995         * objects reachable.  Running rev-list here will return with
 996         * a good (0) exit status and we'll bypass the fetch that we
 997         * really need to perform.  Claiming failure now will ensure
 998         * we perform the network exchange to deepen our history.
 999         */
1000        if (deepen)
1001                return -1;
1002
1003        /*
1004         * check_connected() allows objects to merely be promised, but
1005         * we need all direct targets to exist.
1006         */
1007        for (r = rm; r; r = r->next) {
1008                if (!has_object_file(&r->old_oid))
1009                        return -1;
1010        }
1011
1012        opt.quiet = 1;
1013        return check_connected(iterate_ref_map, &rm, &opt);
1014}
1015
1016static int fetch_refs(struct transport *transport, struct ref *ref_map)
1017{
1018        int ret = check_exist_and_connected(ref_map);
1019        if (ret)
1020                ret = transport_fetch_refs(transport, ref_map);
1021        if (!ret)
1022                /*
1023                 * Keep the new pack's ".keep" file around to allow the caller
1024                 * time to update refs to reference the new objects.
1025                 */
1026                return 0;
1027        transport_unlock_pack(transport);
1028        return ret;
1029}
1030
1031/* Update local refs based on the ref values fetched from a remote */
1032static int consume_refs(struct transport *transport, struct ref *ref_map)
1033{
1034        int connectivity_checked = transport->smart_options
1035                ? transport->smart_options->connectivity_checked : 0;
1036        int ret = store_updated_refs(transport->url,
1037                                     transport->remote->name,
1038                                     connectivity_checked,
1039                                     ref_map);
1040        transport_unlock_pack(transport);
1041        return ret;
1042}
1043
1044static int prune_refs(struct refspec *rs, struct ref *ref_map,
1045                      const char *raw_url)
1046{
1047        int url_len, i, result = 0;
1048        struct ref *ref, *stale_refs = get_stale_heads(rs, ref_map);
1049        char *url;
1050        int summary_width = transport_summary_width(stale_refs);
1051        const char *dangling_msg = dry_run
1052                ? _("   (%s will become dangling)")
1053                : _("   (%s has become dangling)");
1054
1055        if (raw_url)
1056                url = transport_anonymize_url(raw_url);
1057        else
1058                url = xstrdup("foreign");
1059
1060        url_len = strlen(url);
1061        for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
1062                ;
1063
1064        url_len = i + 1;
1065        if (4 < i && !strncmp(".git", url + i - 3, 4))
1066                url_len = i - 3;
1067
1068        if (!dry_run) {
1069                struct string_list refnames = STRING_LIST_INIT_NODUP;
1070
1071                for (ref = stale_refs; ref; ref = ref->next)
1072                        string_list_append(&refnames, ref->name);
1073
1074                result = delete_refs("fetch: prune", &refnames, 0);
1075                string_list_clear(&refnames, 0);
1076        }
1077
1078        if (verbosity >= 0) {
1079                for (ref = stale_refs; ref; ref = ref->next) {
1080                        struct strbuf sb = STRBUF_INIT;
1081                        if (!shown_url) {
1082                                fprintf(stderr, _("From %.*s\n"), url_len, url);
1083                                shown_url = 1;
1084                        }
1085                        format_display(&sb, '-', _("[deleted]"), NULL,
1086                                       _("(none)"), prettify_refname(ref->name),
1087                                       summary_width);
1088                        fprintf(stderr, " %s\n",sb.buf);
1089                        strbuf_release(&sb);
1090                        warn_dangling_symref(stderr, dangling_msg, ref->name);
1091                }
1092        }
1093
1094        free(url);
1095        free_refs(stale_refs);
1096        return result;
1097}
1098
1099static void check_not_current_branch(struct ref *ref_map)
1100{
1101        struct branch *current_branch = branch_get(NULL);
1102
1103        if (is_bare_repository() || !current_branch)
1104                return;
1105
1106        for (; ref_map; ref_map = ref_map->next)
1107                if (ref_map->peer_ref && !strcmp(current_branch->refname,
1108                                        ref_map->peer_ref->name))
1109                        die(_("Refusing to fetch into current branch %s "
1110                            "of non-bare repository"), current_branch->refname);
1111}
1112
1113static int truncate_fetch_head(void)
1114{
1115        const char *filename = git_path_fetch_head(the_repository);
1116        FILE *fp = fopen_for_writing(filename);
1117
1118        if (!fp)
1119                return error_errno(_("cannot open %s"), filename);
1120        fclose(fp);
1121        return 0;
1122}
1123
1124static void set_option(struct transport *transport, const char *name, const char *value)
1125{
1126        int r = transport_set_option(transport, name, value);
1127        if (r < 0)
1128                die(_("Option \"%s\" value \"%s\" is not valid for %s"),
1129                    name, value, transport->url);
1130        if (r > 0)
1131                warning(_("Option \"%s\" is ignored for %s\n"),
1132                        name, transport->url);
1133}
1134
1135
1136static int add_oid(const char *refname, const struct object_id *oid, int flags,
1137                   void *cb_data)
1138{
1139        struct oid_array *oids = cb_data;
1140
1141        oid_array_append(oids, oid);
1142        return 0;
1143}
1144
1145static void add_negotiation_tips(struct git_transport_options *smart_options)
1146{
1147        struct oid_array *oids = xcalloc(1, sizeof(*oids));
1148        int i;
1149
1150        for (i = 0; i < negotiation_tip.nr; i++) {
1151                const char *s = negotiation_tip.items[i].string;
1152                int old_nr;
1153                if (!has_glob_specials(s)) {
1154                        struct object_id oid;
1155                        if (get_oid(s, &oid))
1156                                die("%s is not a valid object", s);
1157                        oid_array_append(oids, &oid);
1158                        continue;
1159                }
1160                old_nr = oids->nr;
1161                for_each_glob_ref(add_oid, s, oids);
1162                if (old_nr == oids->nr)
1163                        warning("Ignoring --negotiation-tip=%s because it does not match any refs",
1164                                s);
1165        }
1166        smart_options->negotiation_tips = oids;
1167}
1168
1169static struct transport *prepare_transport(struct remote *remote, int deepen)
1170{
1171        struct transport *transport;
1172
1173        transport = transport_get(remote, NULL);
1174        transport_set_verbosity(transport, verbosity, progress);
1175        transport->family = family;
1176        if (upload_pack)
1177                set_option(transport, TRANS_OPT_UPLOADPACK, upload_pack);
1178        if (keep)
1179                set_option(transport, TRANS_OPT_KEEP, "yes");
1180        if (depth)
1181                set_option(transport, TRANS_OPT_DEPTH, depth);
1182        if (deepen && deepen_since)
1183                set_option(transport, TRANS_OPT_DEEPEN_SINCE, deepen_since);
1184        if (deepen && deepen_not.nr)
1185                set_option(transport, TRANS_OPT_DEEPEN_NOT,
1186                           (const char *)&deepen_not);
1187        if (deepen_relative)
1188                set_option(transport, TRANS_OPT_DEEPEN_RELATIVE, "yes");
1189        if (update_shallow)
1190                set_option(transport, TRANS_OPT_UPDATE_SHALLOW, "yes");
1191        if (filter_options.choice) {
1192                struct strbuf expanded_filter_spec = STRBUF_INIT;
1193                expand_list_objects_filter_spec(&filter_options,
1194                                                &expanded_filter_spec);
1195                set_option(transport, TRANS_OPT_LIST_OBJECTS_FILTER,
1196                           expanded_filter_spec.buf);
1197                set_option(transport, TRANS_OPT_FROM_PROMISOR, "1");
1198                strbuf_release(&expanded_filter_spec);
1199        }
1200        if (negotiation_tip.nr) {
1201                if (transport->smart_options)
1202                        add_negotiation_tips(transport->smart_options);
1203                else
1204                        warning("Ignoring --negotiation-tip because the protocol does not support it.");
1205        }
1206        return transport;
1207}
1208
1209static void backfill_tags(struct transport *transport, struct ref *ref_map)
1210{
1211        int cannot_reuse;
1212
1213        /*
1214         * Once we have set TRANS_OPT_DEEPEN_SINCE, we can't unset it
1215         * when remote helper is used (setting it to an empty string
1216         * is not unsetting). We could extend the remote helper
1217         * protocol for that, but for now, just force a new connection
1218         * without deepen-since. Similar story for deepen-not.
1219         */
1220        cannot_reuse = transport->cannot_reuse ||
1221                deepen_since || deepen_not.nr;
1222        if (cannot_reuse) {
1223                gsecondary = prepare_transport(transport->remote, 0);
1224                transport = gsecondary;
1225        }
1226
1227        transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
1228        transport_set_option(transport, TRANS_OPT_DEPTH, "0");
1229        transport_set_option(transport, TRANS_OPT_DEEPEN_RELATIVE, NULL);
1230        if (!fetch_refs(transport, ref_map))
1231                consume_refs(transport, ref_map);
1232
1233        if (gsecondary) {
1234                transport_disconnect(gsecondary);
1235                gsecondary = NULL;
1236        }
1237}
1238
1239static int do_fetch(struct transport *transport,
1240                    struct refspec *rs)
1241{
1242        struct ref *ref_map;
1243        int autotags = (transport->remote->fetch_tags == 1);
1244        int retcode = 0;
1245        const struct ref *remote_refs;
1246        struct argv_array ref_prefixes = ARGV_ARRAY_INIT;
1247        int must_list_refs = 1;
1248
1249        if (tags == TAGS_DEFAULT) {
1250                if (transport->remote->fetch_tags == 2)
1251                        tags = TAGS_SET;
1252                if (transport->remote->fetch_tags == -1)
1253                        tags = TAGS_UNSET;
1254        }
1255
1256        /* if not appending, truncate FETCH_HEAD */
1257        if (!append && !dry_run) {
1258                retcode = truncate_fetch_head();
1259                if (retcode)
1260                        goto cleanup;
1261        }
1262
1263        if (rs->nr) {
1264                int i;
1265
1266                refspec_ref_prefixes(rs, &ref_prefixes);
1267
1268                /*
1269                 * We can avoid listing refs if all of them are exact
1270                 * OIDs
1271                 */
1272                must_list_refs = 0;
1273                for (i = 0; i < rs->nr; i++) {
1274                        if (!rs->items[i].exact_sha1) {
1275                                must_list_refs = 1;
1276                                break;
1277                        }
1278                }
1279        } else if (transport->remote && transport->remote->fetch.nr)
1280                refspec_ref_prefixes(&transport->remote->fetch, &ref_prefixes);
1281
1282        if (tags == TAGS_SET || tags == TAGS_DEFAULT) {
1283                must_list_refs = 1;
1284                if (ref_prefixes.argc)
1285                        argv_array_push(&ref_prefixes, "refs/tags/");
1286        }
1287
1288        if (must_list_refs)
1289                remote_refs = transport_get_remote_refs(transport, &ref_prefixes);
1290        else
1291                remote_refs = NULL;
1292
1293        argv_array_clear(&ref_prefixes);
1294
1295        ref_map = get_ref_map(transport->remote, remote_refs, rs,
1296                              tags, &autotags);
1297        if (!update_head_ok)
1298                check_not_current_branch(ref_map);
1299
1300        if (tags == TAGS_DEFAULT && autotags)
1301                transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
1302        if (prune) {
1303                /*
1304                 * We only prune based on refspecs specified
1305                 * explicitly (via command line or configuration); we
1306                 * don't care whether --tags was specified.
1307                 */
1308                if (rs->nr) {
1309                        prune_refs(rs, ref_map, transport->url);
1310                } else {
1311                        prune_refs(&transport->remote->fetch,
1312                                   ref_map,
1313                                   transport->url);
1314                }
1315        }
1316        if (fetch_refs(transport, ref_map) || consume_refs(transport, ref_map)) {
1317                free_refs(ref_map);
1318                retcode = 1;
1319                goto cleanup;
1320        }
1321        free_refs(ref_map);
1322
1323        /* if neither --no-tags nor --tags was specified, do automated tag
1324         * following ... */
1325        if (tags == TAGS_DEFAULT && autotags) {
1326                struct ref **tail = &ref_map;
1327                ref_map = NULL;
1328                find_non_local_tags(remote_refs, &ref_map, &tail);
1329                if (ref_map)
1330                        backfill_tags(transport, ref_map);
1331                free_refs(ref_map);
1332        }
1333
1334 cleanup:
1335        return retcode;
1336}
1337
1338static int get_one_remote_for_fetch(struct remote *remote, void *priv)
1339{
1340        struct string_list *list = priv;
1341        if (!remote->skip_default_update)
1342                string_list_append(list, remote->name);
1343        return 0;
1344}
1345
1346struct remote_group_data {
1347        const char *name;
1348        struct string_list *list;
1349};
1350
1351static int get_remote_group(const char *key, const char *value, void *priv)
1352{
1353        struct remote_group_data *g = priv;
1354
1355        if (skip_prefix(key, "remotes.", &key) && !strcmp(key, g->name)) {
1356                /* split list by white space */
1357                while (*value) {
1358                        size_t wordlen = strcspn(value, " \t\n");
1359
1360                        if (wordlen >= 1)
1361                                string_list_append_nodup(g->list,
1362                                                   xstrndup(value, wordlen));
1363                        value += wordlen + (value[wordlen] != '\0');
1364                }
1365        }
1366
1367        return 0;
1368}
1369
1370static int add_remote_or_group(const char *name, struct string_list *list)
1371{
1372        int prev_nr = list->nr;
1373        struct remote_group_data g;
1374        g.name = name; g.list = list;
1375
1376        git_config(get_remote_group, &g);
1377        if (list->nr == prev_nr) {
1378                struct remote *remote = remote_get(name);
1379                if (!remote_is_configured(remote, 0))
1380                        return 0;
1381                string_list_append(list, remote->name);
1382        }
1383        return 1;
1384}
1385
1386static void add_options_to_argv(struct argv_array *argv)
1387{
1388        if (dry_run)
1389                argv_array_push(argv, "--dry-run");
1390        if (prune != -1)
1391                argv_array_push(argv, prune ? "--prune" : "--no-prune");
1392        if (prune_tags != -1)
1393                argv_array_push(argv, prune_tags ? "--prune-tags" : "--no-prune-tags");
1394        if (update_head_ok)
1395                argv_array_push(argv, "--update-head-ok");
1396        if (force)
1397                argv_array_push(argv, "--force");
1398        if (keep)
1399                argv_array_push(argv, "--keep");
1400        if (recurse_submodules == RECURSE_SUBMODULES_ON)
1401                argv_array_push(argv, "--recurse-submodules");
1402        else if (recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND)
1403                argv_array_push(argv, "--recurse-submodules=on-demand");
1404        if (tags == TAGS_SET)
1405                argv_array_push(argv, "--tags");
1406        else if (tags == TAGS_UNSET)
1407                argv_array_push(argv, "--no-tags");
1408        if (verbosity >= 2)
1409                argv_array_push(argv, "-v");
1410        if (verbosity >= 1)
1411                argv_array_push(argv, "-v");
1412        else if (verbosity < 0)
1413                argv_array_push(argv, "-q");
1414
1415}
1416
1417static int fetch_multiple(struct string_list *list)
1418{
1419        int i, result = 0;
1420        struct argv_array argv = ARGV_ARRAY_INIT;
1421
1422        if (!append && !dry_run) {
1423                int errcode = truncate_fetch_head();
1424                if (errcode)
1425                        return errcode;
1426        }
1427
1428        argv_array_pushl(&argv, "fetch", "--append", NULL);
1429        add_options_to_argv(&argv);
1430
1431        for (i = 0; i < list->nr; i++) {
1432                const char *name = list->items[i].string;
1433                argv_array_push(&argv, name);
1434                if (verbosity >= 0)
1435                        printf(_("Fetching %s\n"), name);
1436                if (run_command_v_opt(argv.argv, RUN_GIT_CMD)) {
1437                        error(_("Could not fetch %s"), name);
1438                        result = 1;
1439                }
1440                argv_array_pop(&argv);
1441        }
1442
1443        argv_array_clear(&argv);
1444        return result;
1445}
1446
1447/*
1448 * Fetching from the promisor remote should use the given filter-spec
1449 * or inherit the default filter-spec from the config.
1450 */
1451static inline void fetch_one_setup_partial(struct remote *remote)
1452{
1453        /*
1454         * Explicit --no-filter argument overrides everything, regardless
1455         * of any prior partial clones and fetches.
1456         */
1457        if (filter_options.no_filter)
1458                return;
1459
1460        /*
1461         * If no prior partial clone/fetch and the current fetch DID NOT
1462         * request a partial-fetch, do a normal fetch.
1463         */
1464        if (!has_promisor_remote() && !filter_options.choice)
1465                return;
1466
1467        /*
1468         * If this is the FIRST partial-fetch request, we enable partial
1469         * on this repo and remember the given filter-spec as the default
1470         * for subsequent fetches to this remote.
1471         */
1472        if (!has_promisor_remote() && filter_options.choice) {
1473                partial_clone_register(remote->name, &filter_options);
1474                return;
1475        }
1476
1477        /*
1478         * We are currently limited to only ONE promisor remote and only
1479         * allow partial-fetches from the promisor remote.
1480         */
1481        if (!promisor_remote_find(remote->name)) {
1482                if (filter_options.choice)
1483                        die(_("--filter can only be used with the remote "
1484                              "configured in extensions.partialClone"));
1485                return;
1486        }
1487
1488        /*
1489         * Do a partial-fetch from the promisor remote using either the
1490         * explicitly given filter-spec or inherit the filter-spec from
1491         * the config.
1492         */
1493        if (!filter_options.choice)
1494                partial_clone_get_default_filter_spec(&filter_options);
1495        return;
1496}
1497
1498static int fetch_one(struct remote *remote, int argc, const char **argv, int prune_tags_ok)
1499{
1500        struct refspec rs = REFSPEC_INIT_FETCH;
1501        int i;
1502        int exit_code;
1503        int maybe_prune_tags;
1504        int remote_via_config = remote_is_configured(remote, 0);
1505
1506        if (!remote)
1507                die(_("No remote repository specified.  Please, specify either a URL or a\n"
1508                    "remote name from which new revisions should be fetched."));
1509
1510        gtransport = prepare_transport(remote, 1);
1511
1512        if (prune < 0) {
1513                /* no command line request */
1514                if (0 <= remote->prune)
1515                        prune = remote->prune;
1516                else if (0 <= fetch_prune_config)
1517                        prune = fetch_prune_config;
1518                else
1519                        prune = PRUNE_BY_DEFAULT;
1520        }
1521
1522        if (prune_tags < 0) {
1523                /* no command line request */
1524                if (0 <= remote->prune_tags)
1525                        prune_tags = remote->prune_tags;
1526                else if (0 <= fetch_prune_tags_config)
1527                        prune_tags = fetch_prune_tags_config;
1528                else
1529                        prune_tags = PRUNE_TAGS_BY_DEFAULT;
1530        }
1531
1532        maybe_prune_tags = prune_tags_ok && prune_tags;
1533        if (maybe_prune_tags && remote_via_config)
1534                refspec_append(&remote->fetch, TAG_REFSPEC);
1535
1536        if (maybe_prune_tags && (argc || !remote_via_config))
1537                refspec_append(&rs, TAG_REFSPEC);
1538
1539        for (i = 0; i < argc; i++) {
1540                if (!strcmp(argv[i], "tag")) {
1541                        char *tag;
1542                        i++;
1543                        if (i >= argc)
1544                                die(_("You need to specify a tag name."));
1545
1546                        tag = xstrfmt("refs/tags/%s:refs/tags/%s",
1547                                      argv[i], argv[i]);
1548                        refspec_append(&rs, tag);
1549                        free(tag);
1550                } else {
1551                        refspec_append(&rs, argv[i]);
1552                }
1553        }
1554
1555        if (server_options.nr)
1556                gtransport->server_options = &server_options;
1557
1558        sigchain_push_common(unlock_pack_on_signal);
1559        atexit(unlock_pack);
1560        sigchain_push(SIGPIPE, SIG_IGN);
1561        exit_code = do_fetch(gtransport, &rs);
1562        sigchain_pop(SIGPIPE);
1563        refspec_clear(&rs);
1564        transport_disconnect(gtransport);
1565        gtransport = NULL;
1566        return exit_code;
1567}
1568
1569int cmd_fetch(int argc, const char **argv, const char *prefix)
1570{
1571        int i;
1572        struct string_list list = STRING_LIST_INIT_DUP;
1573        struct remote *remote = NULL;
1574        int result = 0;
1575        int prune_tags_ok = 1;
1576        struct argv_array argv_gc_auto = ARGV_ARRAY_INIT;
1577
1578        packet_trace_identity("fetch");
1579
1580        fetch_if_missing = 0;
1581
1582        /* Record the command line for the reflog */
1583        strbuf_addstr(&default_rla, "fetch");
1584        for (i = 1; i < argc; i++)
1585                strbuf_addf(&default_rla, " %s", argv[i]);
1586
1587        fetch_config_from_gitmodules(&max_children, &recurse_submodules);
1588        git_config(git_fetch_config, NULL);
1589
1590        argc = parse_options(argc, argv, prefix,
1591                             builtin_fetch_options, builtin_fetch_usage, 0);
1592
1593        if (deepen_relative) {
1594                if (deepen_relative < 0)
1595                        die(_("Negative depth in --deepen is not supported"));
1596                if (depth)
1597                        die(_("--deepen and --depth are mutually exclusive"));
1598                depth = xstrfmt("%d", deepen_relative);
1599        }
1600        if (unshallow) {
1601                if (depth)
1602                        die(_("--depth and --unshallow cannot be used together"));
1603                else if (!is_repository_shallow(the_repository))
1604                        die(_("--unshallow on a complete repository does not make sense"));
1605                else
1606                        depth = xstrfmt("%d", INFINITE_DEPTH);
1607        }
1608
1609        /* no need to be strict, transport_set_option() will validate it again */
1610        if (depth && atoi(depth) < 1)
1611                die(_("depth %s is not a positive number"), depth);
1612        if (depth || deepen_since || deepen_not.nr)
1613                deepen = 1;
1614
1615        if (filter_options.choice && !has_promisor_remote())
1616                die("--filter can only be used when extensions.partialClone is set");
1617
1618        if (all) {
1619                if (argc == 1)
1620                        die(_("fetch --all does not take a repository argument"));
1621                else if (argc > 1)
1622                        die(_("fetch --all does not make sense with refspecs"));
1623                (void) for_each_remote(get_one_remote_for_fetch, &list);
1624        } else if (argc == 0) {
1625                /* No arguments -- use default remote */
1626                remote = remote_get(NULL);
1627        } else if (multiple) {
1628                /* All arguments are assumed to be remotes or groups */
1629                for (i = 0; i < argc; i++)
1630                        if (!add_remote_or_group(argv[i], &list))
1631                                die(_("No such remote or remote group: %s"), argv[i]);
1632        } else {
1633                /* Single remote or group */
1634                (void) add_remote_or_group(argv[0], &list);
1635                if (list.nr > 1) {
1636                        /* More than one remote */
1637                        if (argc > 1)
1638                                die(_("Fetching a group and specifying refspecs does not make sense"));
1639                } else {
1640                        /* Zero or one remotes */
1641                        remote = remote_get(argv[0]);
1642                        prune_tags_ok = (argc == 1);
1643                        argc--;
1644                        argv++;
1645                }
1646        }
1647
1648        if (remote) {
1649                if (filter_options.choice || has_promisor_remote())
1650                        fetch_one_setup_partial(remote);
1651                result = fetch_one(remote, argc, argv, prune_tags_ok);
1652        } else {
1653                if (filter_options.choice)
1654                        die(_("--filter can only be used with the remote "
1655                              "configured in extensions.partialclone"));
1656                /* TODO should this also die if we have a previous partial-clone? */
1657                result = fetch_multiple(&list);
1658        }
1659
1660        if (!result && (recurse_submodules != RECURSE_SUBMODULES_OFF)) {
1661                struct argv_array options = ARGV_ARRAY_INIT;
1662
1663                add_options_to_argv(&options);
1664                result = fetch_populated_submodules(the_repository,
1665                                                    &options,
1666                                                    submodule_prefix,
1667                                                    recurse_submodules,
1668                                                    recurse_submodules_default,
1669                                                    verbosity < 0,
1670                                                    max_children);
1671                argv_array_clear(&options);
1672        }
1673
1674        string_list_clear(&list, 0);
1675
1676        close_all_packs(the_repository->objects);
1677
1678        argv_array_pushl(&argv_gc_auto, "gc", "--auto", NULL);
1679        if (verbosity < 0)
1680                argv_array_push(&argv_gc_auto, "--quiet");
1681        run_command_v_opt(argv_gc_auto.argv, RUN_GIT_CMD);
1682        argv_array_clear(&argv_gc_auto);
1683
1684        return result;
1685}