builtin / fetch.con commit Merge branch 'tg/glossary-overlay' (b024a14)
   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
  27static const char * const builtin_fetch_usage[] = {
  28        N_("git fetch [<options>] [<repository> [<refspec>...]]"),
  29        N_("git fetch [<options>] <group>"),
  30        N_("git fetch --multiple [<options>] [(<repository> | <group>)...]"),
  31        N_("git fetch --all [<options>]"),
  32        NULL
  33};
  34
  35enum {
  36        TAGS_UNSET = 0,
  37        TAGS_DEFAULT = 1,
  38        TAGS_SET = 2
  39};
  40
  41static int fetch_prune_config = -1; /* unspecified */
  42static int prune = -1; /* unspecified */
  43#define PRUNE_BY_DEFAULT 0 /* do we prune by default? */
  44
  45static int fetch_prune_tags_config = -1; /* unspecified */
  46static int prune_tags = -1; /* unspecified */
  47#define PRUNE_TAGS_BY_DEFAULT 0 /* do we prune tags by default? */
  48
  49static int all, append, dry_run, force, keep, multiple, update_head_ok, verbosity, deepen_relative;
  50static int progress = -1;
  51static int tags = TAGS_DEFAULT, unshallow, update_shallow, deepen;
  52static int max_children = 1;
  53static enum transport_family family;
  54static const char *depth;
  55static const char *deepen_since;
  56static const char *upload_pack;
  57static struct string_list deepen_not = STRING_LIST_INIT_NODUP;
  58static struct strbuf default_rla = STRBUF_INIT;
  59static struct transport *gtransport;
  60static struct transport *gsecondary;
  61static const char *submodule_prefix = "";
  62static int recurse_submodules = RECURSE_SUBMODULES_DEFAULT;
  63static int recurse_submodules_default = RECURSE_SUBMODULES_ON_DEMAND;
  64static int shown_url = 0;
  65static struct refspec refmap = REFSPEC_INIT_FETCH;
  66static struct list_objects_filter_options filter_options;
  67static struct string_list server_options = STRING_LIST_INIT_DUP;
  68static struct string_list negotiation_tip = STRING_LIST_INIT_NODUP;
  69
  70static int git_fetch_config(const char *k, const char *v, void *cb)
  71{
  72        if (!strcmp(k, "fetch.prune")) {
  73                fetch_prune_config = git_config_bool(k, v);
  74                return 0;
  75        }
  76
  77        if (!strcmp(k, "fetch.prunetags")) {
  78                fetch_prune_tags_config = git_config_bool(k, v);
  79                return 0;
  80        }
  81
  82        if (!strcmp(k, "submodule.recurse")) {
  83                int r = git_config_bool(k, v) ?
  84                        RECURSE_SUBMODULES_ON : RECURSE_SUBMODULES_OFF;
  85                recurse_submodules = r;
  86        }
  87
  88        if (!strcmp(k, "submodule.fetchjobs")) {
  89                max_children = parse_submodule_fetchjobs(k, v);
  90                return 0;
  91        } else if (!strcmp(k, "fetch.recursesubmodules")) {
  92                recurse_submodules = parse_fetch_recurse_submodules_arg(k, v);
  93                return 0;
  94        }
  95
  96        return git_default_config(k, v, cb);
  97}
  98
  99static int parse_refmap_arg(const struct option *opt, const char *arg, int unset)
 100{
 101        BUG_ON_OPT_NEG(unset);
 102
 103        /*
 104         * "git fetch --refmap='' origin foo"
 105         * can be used to tell the command not to store anywhere
 106         */
 107        refspec_append(&refmap, arg);
 108
 109        return 0;
 110}
 111
 112static struct option builtin_fetch_options[] = {
 113        OPT__VERBOSITY(&verbosity),
 114        OPT_BOOL(0, "all", &all,
 115                 N_("fetch from all remotes")),
 116        OPT_BOOL('a', "append", &append,
 117                 N_("append to .git/FETCH_HEAD instead of overwriting")),
 118        OPT_STRING(0, "upload-pack", &upload_pack, N_("path"),
 119                   N_("path to upload pack on remote end")),
 120        OPT__FORCE(&force, N_("force overwrite of local reference"), 0),
 121        OPT_BOOL('m', "multiple", &multiple,
 122                 N_("fetch from multiple remotes")),
 123        OPT_SET_INT('t', "tags", &tags,
 124                    N_("fetch all tags and associated objects"), TAGS_SET),
 125        OPT_SET_INT('n', NULL, &tags,
 126                    N_("do not fetch all tags (--no-tags)"), TAGS_UNSET),
 127        OPT_INTEGER('j', "jobs", &max_children,
 128                    N_("number of submodules fetched in parallel")),
 129        OPT_BOOL('p', "prune", &prune,
 130                 N_("prune remote-tracking branches no longer on remote")),
 131        OPT_BOOL('P', "prune-tags", &prune_tags,
 132                 N_("prune local tags no longer on remote and clobber changed tags")),
 133        { OPTION_CALLBACK, 0, "recurse-submodules", &recurse_submodules, N_("on-demand"),
 134                    N_("control recursive fetching of submodules"),
 135                    PARSE_OPT_OPTARG, option_fetch_parse_recurse_submodules },
 136        OPT_BOOL(0, "dry-run", &dry_run,
 137                 N_("dry run")),
 138        OPT_BOOL('k', "keep", &keep, N_("keep downloaded pack")),
 139        OPT_BOOL('u', "update-head-ok", &update_head_ok,
 140                    N_("allow updating of HEAD ref")),
 141        OPT_BOOL(0, "progress", &progress, N_("force progress reporting")),
 142        OPT_STRING(0, "depth", &depth, N_("depth"),
 143                   N_("deepen history of shallow clone")),
 144        OPT_STRING(0, "shallow-since", &deepen_since, N_("time"),
 145                   N_("deepen history of shallow repository based on time")),
 146        OPT_STRING_LIST(0, "shallow-exclude", &deepen_not, N_("revision"),
 147                        N_("deepen history of shallow clone, excluding rev")),
 148        OPT_INTEGER(0, "deepen", &deepen_relative,
 149                    N_("deepen history of shallow clone")),
 150        OPT_SET_INT_F(0, "unshallow", &unshallow,
 151                      N_("convert to a complete repository"),
 152                      1, PARSE_OPT_NONEG),
 153        { OPTION_STRING, 0, "submodule-prefix", &submodule_prefix, N_("dir"),
 154                   N_("prepend this to submodule path output"), PARSE_OPT_HIDDEN },
 155        { OPTION_CALLBACK, 0, "recurse-submodules-default",
 156                   &recurse_submodules_default, N_("on-demand"),
 157                   N_("default for recursive fetching of submodules "
 158                      "(lower priority than config files)"),
 159                   PARSE_OPT_HIDDEN, option_fetch_parse_recurse_submodules },
 160        OPT_BOOL(0, "update-shallow", &update_shallow,
 161                 N_("accept refs that update .git/shallow")),
 162        { OPTION_CALLBACK, 0, "refmap", NULL, N_("refmap"),
 163          N_("specify fetch refmap"), PARSE_OPT_NONEG, parse_refmap_arg },
 164        OPT_STRING_LIST('o', "server-option", &server_options, N_("server-specific"), N_("option to transmit")),
 165        OPT_SET_INT('4', "ipv4", &family, N_("use IPv4 addresses only"),
 166                        TRANSPORT_FAMILY_IPV4),
 167        OPT_SET_INT('6', "ipv6", &family, N_("use IPv6 addresses only"),
 168                        TRANSPORT_FAMILY_IPV6),
 169        OPT_STRING_LIST(0, "negotiation-tip", &negotiation_tip, N_("revision"),
 170                        N_("report that we have only objects reachable from this object")),
 171        OPT_PARSE_LIST_OBJECTS_FILTER(&filter_options),
 172        OPT_END()
 173};
 174
 175static void unlock_pack(void)
 176{
 177        if (gtransport)
 178                transport_unlock_pack(gtransport);
 179        if (gsecondary)
 180                transport_unlock_pack(gsecondary);
 181}
 182
 183static void unlock_pack_on_signal(int signo)
 184{
 185        unlock_pack();
 186        sigchain_pop(signo);
 187        raise(signo);
 188}
 189
 190static void add_merge_config(struct ref **head,
 191                           const struct ref *remote_refs,
 192                           struct branch *branch,
 193                           struct ref ***tail)
 194{
 195        int i;
 196
 197        for (i = 0; i < branch->merge_nr; i++) {
 198                struct ref *rm, **old_tail = *tail;
 199                struct refspec_item refspec;
 200
 201                for (rm = *head; rm; rm = rm->next) {
 202                        if (branch_merge_matches(branch, i, rm->name)) {
 203                                rm->fetch_head_status = FETCH_HEAD_MERGE;
 204                                break;
 205                        }
 206                }
 207                if (rm)
 208                        continue;
 209
 210                /*
 211                 * Not fetched to a remote-tracking branch?  We need to fetch
 212                 * it anyway to allow this branch's "branch.$name.merge"
 213                 * to be honored by 'git pull', but we do not have to
 214                 * fail if branch.$name.merge is misconfigured to point
 215                 * at a nonexisting branch.  If we were indeed called by
 216                 * 'git pull', it will notice the misconfiguration because
 217                 * there is no entry in the resulting FETCH_HEAD marked
 218                 * for merging.
 219                 */
 220                memset(&refspec, 0, sizeof(refspec));
 221                refspec.src = branch->merge[i]->src;
 222                get_fetch_map(remote_refs, &refspec, tail, 1);
 223                for (rm = *old_tail; rm; rm = rm->next)
 224                        rm->fetch_head_status = FETCH_HEAD_MERGE;
 225        }
 226}
 227
 228static int will_fetch(struct ref **head, const unsigned char *sha1)
 229{
 230        struct ref *rm = *head;
 231        while (rm) {
 232                if (hasheq(rm->old_oid.hash, sha1))
 233                        return 1;
 234                rm = rm->next;
 235        }
 236        return 0;
 237}
 238
 239struct refname_hash_entry {
 240        struct hashmap_entry ent; /* must be the first member */
 241        struct object_id oid;
 242        char refname[FLEX_ARRAY];
 243};
 244
 245static int refname_hash_entry_cmp(const void *hashmap_cmp_fn_data,
 246                                  const void *e1_,
 247                                  const void *e2_,
 248                                  const void *keydata)
 249{
 250        const struct refname_hash_entry *e1 = e1_;
 251        const struct refname_hash_entry *e2 = e2_;
 252
 253        return strcmp(e1->refname, keydata ? keydata : e2->refname);
 254}
 255
 256static struct refname_hash_entry *refname_hash_add(struct hashmap *map,
 257                                                   const char *refname,
 258                                                   const struct object_id *oid)
 259{
 260        struct refname_hash_entry *ent;
 261        size_t len = strlen(refname);
 262
 263        FLEX_ALLOC_MEM(ent, refname, refname, len);
 264        hashmap_entry_init(ent, strhash(refname));
 265        oidcpy(&ent->oid, oid);
 266        hashmap_add(map, ent);
 267        return ent;
 268}
 269
 270static int add_one_refname(const char *refname,
 271                           const struct object_id *oid,
 272                           int flag, void *cbdata)
 273{
 274        struct hashmap *refname_map = cbdata;
 275
 276        (void) refname_hash_add(refname_map, refname, oid);
 277        return 0;
 278}
 279
 280static void refname_hash_init(struct hashmap *map)
 281{
 282        hashmap_init(map, refname_hash_entry_cmp, NULL, 0);
 283}
 284
 285static int refname_hash_exists(struct hashmap *map, const char *refname)
 286{
 287        return !!hashmap_get_from_hash(map, strhash(refname), refname);
 288}
 289
 290static void find_non_local_tags(const struct ref *refs,
 291                                struct ref **head,
 292                                struct ref ***tail)
 293{
 294        struct hashmap existing_refs;
 295        struct hashmap remote_refs;
 296        struct string_list remote_refs_list = STRING_LIST_INIT_NODUP;
 297        struct string_list_item *remote_ref_item;
 298        const struct ref *ref;
 299        struct refname_hash_entry *item = NULL;
 300
 301        refname_hash_init(&existing_refs);
 302        refname_hash_init(&remote_refs);
 303
 304        for_each_ref(add_one_refname, &existing_refs);
 305        for (ref = refs; ref; ref = ref->next) {
 306                if (!starts_with(ref->name, "refs/tags/"))
 307                        continue;
 308
 309                /*
 310                 * The peeled ref always follows the matching base
 311                 * ref, so if we see a peeled ref that we don't want
 312                 * to fetch then we can mark the ref entry in the list
 313                 * as one to ignore by setting util to NULL.
 314                 */
 315                if (ends_with(ref->name, "^{}")) {
 316                        if (item &&
 317                            !has_object_file_with_flags(&ref->old_oid,
 318                                                        OBJECT_INFO_QUICK) &&
 319                            !will_fetch(head, ref->old_oid.hash) &&
 320                            !has_object_file_with_flags(&item->oid, OBJECT_INFO_QUICK) &&
 321                            !will_fetch(head, item->oid.hash))
 322                                oidclr(&item->oid);
 323                        item = NULL;
 324                        continue;
 325                }
 326
 327                /*
 328                 * If item is non-NULL here, then we previously saw a
 329                 * ref not followed by a peeled reference, so we need
 330                 * to check if it is a lightweight tag that we want to
 331                 * fetch.
 332                 */
 333                if (item &&
 334                    !has_object_file_with_flags(&item->oid, OBJECT_INFO_QUICK) &&
 335                    !will_fetch(head, item->oid.hash))
 336                        oidclr(&item->oid);
 337
 338                item = NULL;
 339
 340                /* skip duplicates and refs that we already have */
 341                if (refname_hash_exists(&remote_refs, ref->name) ||
 342                    refname_hash_exists(&existing_refs, ref->name))
 343                        continue;
 344
 345                item = refname_hash_add(&remote_refs, ref->name, &ref->old_oid);
 346                string_list_insert(&remote_refs_list, ref->name);
 347        }
 348        hashmap_free(&existing_refs, 1);
 349
 350        /*
 351         * We may have a final lightweight tag that needs to be
 352         * checked to see if it needs fetching.
 353         */
 354        if (item &&
 355            !has_object_file_with_flags(&item->oid, OBJECT_INFO_QUICK) &&
 356            !will_fetch(head, item->oid.hash))
 357                oidclr(&item->oid);
 358
 359        /*
 360         * For all the tags in the remote_refs_list,
 361         * add them to the list of refs to be fetched
 362         */
 363        for_each_string_list_item(remote_ref_item, &remote_refs_list) {
 364                const char *refname = remote_ref_item->string;
 365
 366                item = hashmap_get_from_hash(&remote_refs, strhash(refname), refname);
 367                if (!item)
 368                        BUG("unseen remote ref?");
 369
 370                /* Unless we have already decided to ignore this item... */
 371                if (!is_null_oid(&item->oid)) {
 372                        struct ref *rm = alloc_ref(item->refname);
 373                        rm->peer_ref = alloc_ref(item->refname);
 374                        oidcpy(&rm->old_oid, &item->oid);
 375                        **tail = rm;
 376                        *tail = &rm->next;
 377                }
 378        }
 379        hashmap_free(&remote_refs, 1);
 380        string_list_clear(&remote_refs_list, 0);
 381}
 382
 383static struct ref *get_ref_map(struct remote *remote,
 384                               const struct ref *remote_refs,
 385                               struct refspec *rs,
 386                               int tags, int *autotags)
 387{
 388        int i;
 389        struct ref *rm;
 390        struct ref *ref_map = NULL;
 391        struct ref **tail = &ref_map;
 392
 393        /* opportunistically-updated references: */
 394        struct ref *orefs = NULL, **oref_tail = &orefs;
 395
 396        struct hashmap existing_refs;
 397
 398        if (rs->nr) {
 399                struct refspec *fetch_refspec;
 400
 401                for (i = 0; i < rs->nr; i++) {
 402                        get_fetch_map(remote_refs, &rs->items[i], &tail, 0);
 403                        if (rs->items[i].dst && rs->items[i].dst[0])
 404                                *autotags = 1;
 405                }
 406                /* Merge everything on the command line (but not --tags) */
 407                for (rm = ref_map; rm; rm = rm->next)
 408                        rm->fetch_head_status = FETCH_HEAD_MERGE;
 409
 410                /*
 411                 * For any refs that we happen to be fetching via
 412                 * command-line arguments, the destination ref might
 413                 * have been missing or have been different than the
 414                 * remote-tracking ref that would be derived from the
 415                 * configured refspec.  In these cases, we want to
 416                 * take the opportunity to update their configured
 417                 * remote-tracking reference.  However, we do not want
 418                 * to mention these entries in FETCH_HEAD at all, as
 419                 * they would simply be duplicates of existing
 420                 * entries, so we set them FETCH_HEAD_IGNORE below.
 421                 *
 422                 * We compute these entries now, based only on the
 423                 * refspecs specified on the command line.  But we add
 424                 * them to the list following the refspecs resulting
 425                 * from the tags option so that one of the latter,
 426                 * which has FETCH_HEAD_NOT_FOR_MERGE, is not removed
 427                 * by ref_remove_duplicates() in favor of one of these
 428                 * opportunistic entries with FETCH_HEAD_IGNORE.
 429                 */
 430                if (refmap.nr)
 431                        fetch_refspec = &refmap;
 432                else
 433                        fetch_refspec = &remote->fetch;
 434
 435                for (i = 0; i < fetch_refspec->nr; i++)
 436                        get_fetch_map(ref_map, &fetch_refspec->items[i], &oref_tail, 1);
 437        } else if (refmap.nr) {
 438                die("--refmap option is only meaningful with command-line refspec(s).");
 439        } else {
 440                /* Use the defaults */
 441                struct branch *branch = branch_get(NULL);
 442                int has_merge = branch_has_merge_config(branch);
 443                if (remote &&
 444                    (remote->fetch.nr ||
 445                     /* Note: has_merge implies non-NULL branch->remote_name */
 446                     (has_merge && !strcmp(branch->remote_name, remote->name)))) {
 447                        for (i = 0; i < remote->fetch.nr; i++) {
 448                                get_fetch_map(remote_refs, &remote->fetch.items[i], &tail, 0);
 449                                if (remote->fetch.items[i].dst &&
 450                                    remote->fetch.items[i].dst[0])
 451                                        *autotags = 1;
 452                                if (!i && !has_merge && ref_map &&
 453                                    !remote->fetch.items[0].pattern)
 454                                        ref_map->fetch_head_status = FETCH_HEAD_MERGE;
 455                        }
 456                        /*
 457                         * if the remote we're fetching from is the same
 458                         * as given in branch.<name>.remote, we add the
 459                         * ref given in branch.<name>.merge, too.
 460                         *
 461                         * Note: has_merge implies non-NULL branch->remote_name
 462                         */
 463                        if (has_merge &&
 464                            !strcmp(branch->remote_name, remote->name))
 465                                add_merge_config(&ref_map, remote_refs, branch, &tail);
 466                } else {
 467                        ref_map = get_remote_ref(remote_refs, "HEAD");
 468                        if (!ref_map)
 469                                die(_("Couldn't find remote ref HEAD"));
 470                        ref_map->fetch_head_status = FETCH_HEAD_MERGE;
 471                        tail = &ref_map->next;
 472                }
 473        }
 474
 475        if (tags == TAGS_SET)
 476                /* also fetch all tags */
 477                get_fetch_map(remote_refs, tag_refspec, &tail, 0);
 478        else if (tags == TAGS_DEFAULT && *autotags)
 479                find_non_local_tags(remote_refs, &ref_map, &tail);
 480
 481        /* Now append any refs to be updated opportunistically: */
 482        *tail = orefs;
 483        for (rm = orefs; rm; rm = rm->next) {
 484                rm->fetch_head_status = FETCH_HEAD_IGNORE;
 485                tail = &rm->next;
 486        }
 487
 488        ref_map = ref_remove_duplicates(ref_map);
 489
 490        refname_hash_init(&existing_refs);
 491        for_each_ref(add_one_refname, &existing_refs);
 492
 493        for (rm = ref_map; rm; rm = rm->next) {
 494                if (rm->peer_ref) {
 495                        const char *refname = rm->peer_ref->name;
 496                        struct refname_hash_entry *peer_item;
 497
 498                        peer_item = hashmap_get_from_hash(&existing_refs,
 499                                                          strhash(refname),
 500                                                          refname);
 501                        if (peer_item) {
 502                                struct object_id *old_oid = &peer_item->oid;
 503                                oidcpy(&rm->peer_ref->old_oid, old_oid);
 504                        }
 505                }
 506        }
 507        hashmap_free(&existing_refs, 1);
 508
 509        return ref_map;
 510}
 511
 512#define STORE_REF_ERROR_OTHER 1
 513#define STORE_REF_ERROR_DF_CONFLICT 2
 514
 515static int s_update_ref(const char *action,
 516                        struct ref *ref,
 517                        int check_old)
 518{
 519        char *msg;
 520        char *rla = getenv("GIT_REFLOG_ACTION");
 521        struct ref_transaction *transaction;
 522        struct strbuf err = STRBUF_INIT;
 523        int ret, df_conflict = 0;
 524
 525        if (dry_run)
 526                return 0;
 527        if (!rla)
 528                rla = default_rla.buf;
 529        msg = xstrfmt("%s: %s", rla, action);
 530
 531        transaction = ref_transaction_begin(&err);
 532        if (!transaction ||
 533            ref_transaction_update(transaction, ref->name,
 534                                   &ref->new_oid,
 535                                   check_old ? &ref->old_oid : NULL,
 536                                   0, msg, &err))
 537                goto fail;
 538
 539        ret = ref_transaction_commit(transaction, &err);
 540        if (ret) {
 541                df_conflict = (ret == TRANSACTION_NAME_CONFLICT);
 542                goto fail;
 543        }
 544
 545        ref_transaction_free(transaction);
 546        strbuf_release(&err);
 547        free(msg);
 548        return 0;
 549fail:
 550        ref_transaction_free(transaction);
 551        error("%s", err.buf);
 552        strbuf_release(&err);
 553        free(msg);
 554        return df_conflict ? STORE_REF_ERROR_DF_CONFLICT
 555                           : STORE_REF_ERROR_OTHER;
 556}
 557
 558static int refcol_width = 10;
 559static int compact_format;
 560
 561static void adjust_refcol_width(const struct ref *ref)
 562{
 563        int max, rlen, llen, len;
 564
 565        /* uptodate lines are only shown on high verbosity level */
 566        if (!verbosity && oideq(&ref->peer_ref->old_oid, &ref->old_oid))
 567                return;
 568
 569        max    = term_columns();
 570        rlen   = utf8_strwidth(prettify_refname(ref->name));
 571
 572        llen   = utf8_strwidth(prettify_refname(ref->peer_ref->name));
 573
 574        /*
 575         * rough estimation to see if the output line is too long and
 576         * should not be counted (we can't do precise calculation
 577         * anyway because we don't know if the error explanation part
 578         * will be printed in update_local_ref)
 579         */
 580        if (compact_format) {
 581                llen = 0;
 582                max = max * 2 / 3;
 583        }
 584        len = 21 /* flag and summary */ + rlen + 4 /* -> */ + llen;
 585        if (len >= max)
 586                return;
 587
 588        /*
 589         * Not precise calculation for compact mode because '*' can
 590         * appear on the left hand side of '->' and shrink the column
 591         * back.
 592         */
 593        if (refcol_width < rlen)
 594                refcol_width = rlen;
 595}
 596
 597static void prepare_format_display(struct ref *ref_map)
 598{
 599        struct ref *rm;
 600        const char *format = "full";
 601
 602        git_config_get_string_const("fetch.output", &format);
 603        if (!strcasecmp(format, "full"))
 604                compact_format = 0;
 605        else if (!strcasecmp(format, "compact"))
 606                compact_format = 1;
 607        else
 608                die(_("configuration fetch.output contains invalid value %s"),
 609                    format);
 610
 611        for (rm = ref_map; rm; rm = rm->next) {
 612                if (rm->status == REF_STATUS_REJECT_SHALLOW ||
 613                    !rm->peer_ref ||
 614                    !strcmp(rm->name, "HEAD"))
 615                        continue;
 616
 617                adjust_refcol_width(rm);
 618        }
 619}
 620
 621static void print_remote_to_local(struct strbuf *display,
 622                                  const char *remote, const char *local)
 623{
 624        strbuf_addf(display, "%-*s -> %s", refcol_width, remote, local);
 625}
 626
 627static int find_and_replace(struct strbuf *haystack,
 628                            const char *needle,
 629                            const char *placeholder)
 630{
 631        const char *p = NULL;
 632        int plen, nlen;
 633
 634        nlen = strlen(needle);
 635        if (ends_with(haystack->buf, needle))
 636                p = haystack->buf + haystack->len - nlen;
 637        else
 638                p = strstr(haystack->buf, needle);
 639        if (!p)
 640                return 0;
 641
 642        if (p > haystack->buf && p[-1] != '/')
 643                return 0;
 644
 645        plen = strlen(p);
 646        if (plen > nlen && p[nlen] != '/')
 647                return 0;
 648
 649        strbuf_splice(haystack, p - haystack->buf, nlen,
 650                      placeholder, strlen(placeholder));
 651        return 1;
 652}
 653
 654static void print_compact(struct strbuf *display,
 655                          const char *remote, const char *local)
 656{
 657        struct strbuf r = STRBUF_INIT;
 658        struct strbuf l = STRBUF_INIT;
 659
 660        if (!strcmp(remote, local)) {
 661                strbuf_addf(display, "%-*s -> *", refcol_width, remote);
 662                return;
 663        }
 664
 665        strbuf_addstr(&r, remote);
 666        strbuf_addstr(&l, local);
 667
 668        if (!find_and_replace(&r, local, "*"))
 669                find_and_replace(&l, remote, "*");
 670        print_remote_to_local(display, r.buf, l.buf);
 671
 672        strbuf_release(&r);
 673        strbuf_release(&l);
 674}
 675
 676static void format_display(struct strbuf *display, char code,
 677                           const char *summary, const char *error,
 678                           const char *remote, const char *local,
 679                           int summary_width)
 680{
 681        int width = (summary_width + strlen(summary) - gettext_width(summary));
 682
 683        strbuf_addf(display, "%c %-*s ", code, width, summary);
 684        if (!compact_format)
 685                print_remote_to_local(display, remote, local);
 686        else
 687                print_compact(display, remote, local);
 688        if (error)
 689                strbuf_addf(display, "  (%s)", error);
 690}
 691
 692static int update_local_ref(struct ref *ref,
 693                            const char *remote,
 694                            const struct ref *remote_ref,
 695                            struct strbuf *display,
 696                            int summary_width)
 697{
 698        struct commit *current = NULL, *updated;
 699        enum object_type type;
 700        struct branch *current_branch = branch_get(NULL);
 701        const char *pretty_ref = prettify_refname(ref->name);
 702
 703        type = oid_object_info(the_repository, &ref->new_oid, NULL);
 704        if (type < 0)
 705                die(_("object %s not found"), oid_to_hex(&ref->new_oid));
 706
 707        if (oideq(&ref->old_oid, &ref->new_oid)) {
 708                if (verbosity > 0)
 709                        format_display(display, '=', _("[up to date]"), NULL,
 710                                       remote, pretty_ref, summary_width);
 711                return 0;
 712        }
 713
 714        if (current_branch &&
 715            !strcmp(ref->name, current_branch->name) &&
 716            !(update_head_ok || is_bare_repository()) &&
 717            !is_null_oid(&ref->old_oid)) {
 718                /*
 719                 * If this is the head, and it's not okay to update
 720                 * the head, and the old value of the head isn't empty...
 721                 */
 722                format_display(display, '!', _("[rejected]"),
 723                               _("can't fetch in current branch"),
 724                               remote, pretty_ref, summary_width);
 725                return 1;
 726        }
 727
 728        if (!is_null_oid(&ref->old_oid) &&
 729            starts_with(ref->name, "refs/tags/")) {
 730                if (force || ref->force) {
 731                        int r;
 732                        r = s_update_ref("updating tag", ref, 0);
 733                        format_display(display, r ? '!' : 't', _("[tag update]"),
 734                                       r ? _("unable to update local ref") : NULL,
 735                                       remote, pretty_ref, summary_width);
 736                        return r;
 737                } else {
 738                        format_display(display, '!', _("[rejected]"), _("would clobber existing tag"),
 739                                       remote, pretty_ref, summary_width);
 740                        return 1;
 741                }
 742        }
 743
 744        current = lookup_commit_reference_gently(the_repository,
 745                                                 &ref->old_oid, 1);
 746        updated = lookup_commit_reference_gently(the_repository,
 747                                                 &ref->new_oid, 1);
 748        if (!current || !updated) {
 749                const char *msg;
 750                const char *what;
 751                int r;
 752                /*
 753                 * Nicely describe the new ref we're fetching.
 754                 * Base this on the remote's ref name, as it's
 755                 * more likely to follow a standard layout.
 756                 */
 757                const char *name = remote_ref ? remote_ref->name : "";
 758                if (starts_with(name, "refs/tags/")) {
 759                        msg = "storing tag";
 760                        what = _("[new tag]");
 761                } else if (starts_with(name, "refs/heads/")) {
 762                        msg = "storing head";
 763                        what = _("[new branch]");
 764                } else {
 765                        msg = "storing ref";
 766                        what = _("[new ref]");
 767                }
 768
 769                r = s_update_ref(msg, ref, 0);
 770                format_display(display, r ? '!' : '*', what,
 771                               r ? _("unable to update local ref") : NULL,
 772                               remote, pretty_ref, summary_width);
 773                return r;
 774        }
 775
 776        if (in_merge_bases(current, updated)) {
 777                struct strbuf quickref = STRBUF_INIT;
 778                int r;
 779                strbuf_add_unique_abbrev(&quickref, &current->object.oid, DEFAULT_ABBREV);
 780                strbuf_addstr(&quickref, "..");
 781                strbuf_add_unique_abbrev(&quickref, &ref->new_oid, DEFAULT_ABBREV);
 782                r = s_update_ref("fast-forward", ref, 1);
 783                format_display(display, r ? '!' : ' ', quickref.buf,
 784                               r ? _("unable to update local ref") : NULL,
 785                               remote, pretty_ref, summary_width);
 786                strbuf_release(&quickref);
 787                return r;
 788        } else if (force || ref->force) {
 789                struct strbuf quickref = STRBUF_INIT;
 790                int r;
 791                strbuf_add_unique_abbrev(&quickref, &current->object.oid, DEFAULT_ABBREV);
 792                strbuf_addstr(&quickref, "...");
 793                strbuf_add_unique_abbrev(&quickref, &ref->new_oid, DEFAULT_ABBREV);
 794                r = s_update_ref("forced-update", ref, 1);
 795                format_display(display, r ? '!' : '+', quickref.buf,
 796                               r ? _("unable to update local ref") : _("forced update"),
 797                               remote, pretty_ref, summary_width);
 798                strbuf_release(&quickref);
 799                return r;
 800        } else {
 801                format_display(display, '!', _("[rejected]"), _("non-fast-forward"),
 802                               remote, pretty_ref, summary_width);
 803                return 1;
 804        }
 805}
 806
 807static int iterate_ref_map(void *cb_data, struct object_id *oid)
 808{
 809        struct ref **rm = cb_data;
 810        struct ref *ref = *rm;
 811
 812        while (ref && ref->status == REF_STATUS_REJECT_SHALLOW)
 813                ref = ref->next;
 814        if (!ref)
 815                return -1; /* end of the list */
 816        *rm = ref->next;
 817        oidcpy(oid, &ref->old_oid);
 818        return 0;
 819}
 820
 821static int store_updated_refs(const char *raw_url, const char *remote_name,
 822                              int connectivity_checked, struct ref *ref_map)
 823{
 824        FILE *fp;
 825        struct commit *commit;
 826        int url_len, i, rc = 0;
 827        struct strbuf note = STRBUF_INIT;
 828        const char *what, *kind;
 829        struct ref *rm;
 830        char *url;
 831        const char *filename = dry_run ? "/dev/null" : git_path_fetch_head(the_repository);
 832        int want_status;
 833        int summary_width = transport_summary_width(ref_map);
 834
 835        fp = fopen(filename, "a");
 836        if (!fp)
 837                return error_errno(_("cannot open %s"), filename);
 838
 839        if (raw_url)
 840                url = transport_anonymize_url(raw_url);
 841        else
 842                url = xstrdup("foreign");
 843
 844        if (!connectivity_checked) {
 845                rm = ref_map;
 846                if (check_connected(iterate_ref_map, &rm, NULL)) {
 847                        rc = error(_("%s did not send all necessary objects\n"), url);
 848                        goto abort;
 849                }
 850        }
 851
 852        prepare_format_display(ref_map);
 853
 854        /*
 855         * We do a pass for each fetch_head_status type in their enum order, so
 856         * merged entries are written before not-for-merge. That lets readers
 857         * use FETCH_HEAD as a refname to refer to the ref to be merged.
 858         */
 859        for (want_status = FETCH_HEAD_MERGE;
 860             want_status <= FETCH_HEAD_IGNORE;
 861             want_status++) {
 862                for (rm = ref_map; rm; rm = rm->next) {
 863                        struct ref *ref = NULL;
 864                        const char *merge_status_marker = "";
 865
 866                        if (rm->status == REF_STATUS_REJECT_SHALLOW) {
 867                                if (want_status == FETCH_HEAD_MERGE)
 868                                        warning(_("reject %s because shallow roots are not allowed to be updated"),
 869                                                rm->peer_ref ? rm->peer_ref->name : rm->name);
 870                                continue;
 871                        }
 872
 873                        commit = lookup_commit_reference_gently(the_repository,
 874                                                                &rm->old_oid,
 875                                                                1);
 876                        if (!commit)
 877                                rm->fetch_head_status = FETCH_HEAD_NOT_FOR_MERGE;
 878
 879                        if (rm->fetch_head_status != want_status)
 880                                continue;
 881
 882                        if (rm->peer_ref) {
 883                                ref = alloc_ref(rm->peer_ref->name);
 884                                oidcpy(&ref->old_oid, &rm->peer_ref->old_oid);
 885                                oidcpy(&ref->new_oid, &rm->old_oid);
 886                                ref->force = rm->peer_ref->force;
 887                        }
 888
 889                        if (recurse_submodules != RECURSE_SUBMODULES_OFF)
 890                                check_for_new_submodule_commits(&rm->old_oid);
 891
 892                        if (!strcmp(rm->name, "HEAD")) {
 893                                kind = "";
 894                                what = "";
 895                        }
 896                        else if (starts_with(rm->name, "refs/heads/")) {
 897                                kind = "branch";
 898                                what = rm->name + 11;
 899                        }
 900                        else if (starts_with(rm->name, "refs/tags/")) {
 901                                kind = "tag";
 902                                what = rm->name + 10;
 903                        }
 904                        else if (starts_with(rm->name, "refs/remotes/")) {
 905                                kind = "remote-tracking branch";
 906                                what = rm->name + 13;
 907                        }
 908                        else {
 909                                kind = "";
 910                                what = rm->name;
 911                        }
 912
 913                        url_len = strlen(url);
 914                        for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
 915                                ;
 916                        url_len = i + 1;
 917                        if (4 < i && !strncmp(".git", url + i - 3, 4))
 918                                url_len = i - 3;
 919
 920                        strbuf_reset(&note);
 921                        if (*what) {
 922                                if (*kind)
 923                                        strbuf_addf(&note, "%s ", kind);
 924                                strbuf_addf(&note, "'%s' of ", what);
 925                        }
 926                        switch (rm->fetch_head_status) {
 927                        case FETCH_HEAD_NOT_FOR_MERGE:
 928                                merge_status_marker = "not-for-merge";
 929                                /* fall-through */
 930                        case FETCH_HEAD_MERGE:
 931                                fprintf(fp, "%s\t%s\t%s",
 932                                        oid_to_hex(&rm->old_oid),
 933                                        merge_status_marker,
 934                                        note.buf);
 935                                for (i = 0; i < url_len; ++i)
 936                                        if ('\n' == url[i])
 937                                                fputs("\\n", fp);
 938                                        else
 939                                                fputc(url[i], fp);
 940                                fputc('\n', fp);
 941                                break;
 942                        default:
 943                                /* do not write anything to FETCH_HEAD */
 944                                break;
 945                        }
 946
 947                        strbuf_reset(&note);
 948                        if (ref) {
 949                                rc |= update_local_ref(ref, what, rm, &note,
 950                                                       summary_width);
 951                                free(ref);
 952                        } else
 953                                format_display(&note, '*',
 954                                               *kind ? kind : "branch", NULL,
 955                                               *what ? what : "HEAD",
 956                                               "FETCH_HEAD", summary_width);
 957                        if (note.len) {
 958                                if (verbosity >= 0 && !shown_url) {
 959                                        fprintf(stderr, _("From %.*s\n"),
 960                                                        url_len, url);
 961                                        shown_url = 1;
 962                                }
 963                                if (verbosity >= 0)
 964                                        fprintf(stderr, " %s\n", note.buf);
 965                        }
 966                }
 967        }
 968
 969        if (rc & STORE_REF_ERROR_DF_CONFLICT)
 970                error(_("some local refs could not be updated; try running\n"
 971                      " 'git remote prune %s' to remove any old, conflicting "
 972                      "branches"), remote_name);
 973
 974 abort:
 975        strbuf_release(&note);
 976        free(url);
 977        fclose(fp);
 978        return rc;
 979}
 980
 981/*
 982 * We would want to bypass the object transfer altogether if
 983 * everything we are going to fetch already exists and is connected
 984 * locally.
 985 */
 986static int check_exist_and_connected(struct ref *ref_map)
 987{
 988        struct ref *rm = ref_map;
 989        struct check_connected_options opt = CHECK_CONNECTED_INIT;
 990        struct ref *r;
 991
 992        /*
 993         * If we are deepening a shallow clone we already have these
 994         * objects reachable.  Running rev-list here will return with
 995         * a good (0) exit status and we'll bypass the fetch that we
 996         * really need to perform.  Claiming failure now will ensure
 997         * we perform the network exchange to deepen our history.
 998         */
 999        if (deepen)
1000                return -1;
1001
1002        /*
1003         * check_connected() allows objects to merely be promised, but
1004         * we need all direct targets to exist.
1005         */
1006        for (r = rm; r; r = r->next) {
1007                if (!has_object_file(&r->old_oid))
1008                        return -1;
1009        }
1010
1011        opt.quiet = 1;
1012        return check_connected(iterate_ref_map, &rm, &opt);
1013}
1014
1015static int fetch_refs(struct transport *transport, struct ref *ref_map)
1016{
1017        int ret = check_exist_and_connected(ref_map);
1018        if (ret)
1019                ret = transport_fetch_refs(transport, ref_map);
1020        if (!ret)
1021                /*
1022                 * Keep the new pack's ".keep" file around to allow the caller
1023                 * time to update refs to reference the new objects.
1024                 */
1025                return 0;
1026        transport_unlock_pack(transport);
1027        return ret;
1028}
1029
1030/* Update local refs based on the ref values fetched from a remote */
1031static int consume_refs(struct transport *transport, struct ref *ref_map)
1032{
1033        int connectivity_checked = transport->smart_options
1034                ? transport->smart_options->connectivity_checked : 0;
1035        int ret = store_updated_refs(transport->url,
1036                                     transport->remote->name,
1037                                     connectivity_checked,
1038                                     ref_map);
1039        transport_unlock_pack(transport);
1040        return ret;
1041}
1042
1043static int prune_refs(struct refspec *rs, struct ref *ref_map,
1044                      const char *raw_url)
1045{
1046        int url_len, i, result = 0;
1047        struct ref *ref, *stale_refs = get_stale_heads(rs, ref_map);
1048        char *url;
1049        int summary_width = transport_summary_width(stale_refs);
1050        const char *dangling_msg = dry_run
1051                ? _("   (%s will become dangling)")
1052                : _("   (%s has become dangling)");
1053
1054        if (raw_url)
1055                url = transport_anonymize_url(raw_url);
1056        else
1057                url = xstrdup("foreign");
1058
1059        url_len = strlen(url);
1060        for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
1061                ;
1062
1063        url_len = i + 1;
1064        if (4 < i && !strncmp(".git", url + i - 3, 4))
1065                url_len = i - 3;
1066
1067        if (!dry_run) {
1068                struct string_list refnames = STRING_LIST_INIT_NODUP;
1069
1070                for (ref = stale_refs; ref; ref = ref->next)
1071                        string_list_append(&refnames, ref->name);
1072
1073                result = delete_refs("fetch: prune", &refnames, 0);
1074                string_list_clear(&refnames, 0);
1075        }
1076
1077        if (verbosity >= 0) {
1078                for (ref = stale_refs; ref; ref = ref->next) {
1079                        struct strbuf sb = STRBUF_INIT;
1080                        if (!shown_url) {
1081                                fprintf(stderr, _("From %.*s\n"), url_len, url);
1082                                shown_url = 1;
1083                        }
1084                        format_display(&sb, '-', _("[deleted]"), NULL,
1085                                       _("(none)"), prettify_refname(ref->name),
1086                                       summary_width);
1087                        fprintf(stderr, " %s\n",sb.buf);
1088                        strbuf_release(&sb);
1089                        warn_dangling_symref(stderr, dangling_msg, ref->name);
1090                }
1091        }
1092
1093        free(url);
1094        free_refs(stale_refs);
1095        return result;
1096}
1097
1098static void check_not_current_branch(struct ref *ref_map)
1099{
1100        struct branch *current_branch = branch_get(NULL);
1101
1102        if (is_bare_repository() || !current_branch)
1103                return;
1104
1105        for (; ref_map; ref_map = ref_map->next)
1106                if (ref_map->peer_ref && !strcmp(current_branch->refname,
1107                                        ref_map->peer_ref->name))
1108                        die(_("Refusing to fetch into current branch %s "
1109                            "of non-bare repository"), current_branch->refname);
1110}
1111
1112static int truncate_fetch_head(void)
1113{
1114        const char *filename = git_path_fetch_head(the_repository);
1115        FILE *fp = fopen_for_writing(filename);
1116
1117        if (!fp)
1118                return error_errno(_("cannot open %s"), filename);
1119        fclose(fp);
1120        return 0;
1121}
1122
1123static void set_option(struct transport *transport, const char *name, const char *value)
1124{
1125        int r = transport_set_option(transport, name, value);
1126        if (r < 0)
1127                die(_("Option \"%s\" value \"%s\" is not valid for %s"),
1128                    name, value, transport->url);
1129        if (r > 0)
1130                warning(_("Option \"%s\" is ignored for %s\n"),
1131                        name, transport->url);
1132}
1133
1134
1135static int add_oid(const char *refname, const struct object_id *oid, int flags,
1136                   void *cb_data)
1137{
1138        struct oid_array *oids = cb_data;
1139
1140        oid_array_append(oids, oid);
1141        return 0;
1142}
1143
1144static void add_negotiation_tips(struct git_transport_options *smart_options)
1145{
1146        struct oid_array *oids = xcalloc(1, sizeof(*oids));
1147        int i;
1148
1149        for (i = 0; i < negotiation_tip.nr; i++) {
1150                const char *s = negotiation_tip.items[i].string;
1151                int old_nr;
1152                if (!has_glob_specials(s)) {
1153                        struct object_id oid;
1154                        if (get_oid(s, &oid))
1155                                die("%s is not a valid object", s);
1156                        oid_array_append(oids, &oid);
1157                        continue;
1158                }
1159                old_nr = oids->nr;
1160                for_each_glob_ref(add_oid, s, oids);
1161                if (old_nr == oids->nr)
1162                        warning("Ignoring --negotiation-tip=%s because it does not match any refs",
1163                                s);
1164        }
1165        smart_options->negotiation_tips = oids;
1166}
1167
1168static struct transport *prepare_transport(struct remote *remote, int deepen)
1169{
1170        struct transport *transport;
1171
1172        transport = transport_get(remote, NULL);
1173        transport_set_verbosity(transport, verbosity, progress);
1174        transport->family = family;
1175        if (upload_pack)
1176                set_option(transport, TRANS_OPT_UPLOADPACK, upload_pack);
1177        if (keep)
1178                set_option(transport, TRANS_OPT_KEEP, "yes");
1179        if (depth)
1180                set_option(transport, TRANS_OPT_DEPTH, depth);
1181        if (deepen && deepen_since)
1182                set_option(transport, TRANS_OPT_DEEPEN_SINCE, deepen_since);
1183        if (deepen && deepen_not.nr)
1184                set_option(transport, TRANS_OPT_DEEPEN_NOT,
1185                           (const char *)&deepen_not);
1186        if (deepen_relative)
1187                set_option(transport, TRANS_OPT_DEEPEN_RELATIVE, "yes");
1188        if (update_shallow)
1189                set_option(transport, TRANS_OPT_UPDATE_SHALLOW, "yes");
1190        if (filter_options.choice) {
1191                struct strbuf expanded_filter_spec = STRBUF_INIT;
1192                expand_list_objects_filter_spec(&filter_options,
1193                                                &expanded_filter_spec);
1194                set_option(transport, TRANS_OPT_LIST_OBJECTS_FILTER,
1195                           expanded_filter_spec.buf);
1196                set_option(transport, TRANS_OPT_FROM_PROMISOR, "1");
1197                strbuf_release(&expanded_filter_spec);
1198        }
1199        if (negotiation_tip.nr) {
1200                if (transport->smart_options)
1201                        add_negotiation_tips(transport->smart_options);
1202                else
1203                        warning("Ignoring --negotiation-tip because the protocol does not support it.");
1204        }
1205        return transport;
1206}
1207
1208static void backfill_tags(struct transport *transport, struct ref *ref_map)
1209{
1210        int cannot_reuse;
1211
1212        /*
1213         * Once we have set TRANS_OPT_DEEPEN_SINCE, we can't unset it
1214         * when remote helper is used (setting it to an empty string
1215         * is not unsetting). We could extend the remote helper
1216         * protocol for that, but for now, just force a new connection
1217         * without deepen-since. Similar story for deepen-not.
1218         */
1219        cannot_reuse = transport->cannot_reuse ||
1220                deepen_since || deepen_not.nr;
1221        if (cannot_reuse) {
1222                gsecondary = prepare_transport(transport->remote, 0);
1223                transport = gsecondary;
1224        }
1225
1226        transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
1227        transport_set_option(transport, TRANS_OPT_DEPTH, "0");
1228        transport_set_option(transport, TRANS_OPT_DEEPEN_RELATIVE, NULL);
1229        if (!fetch_refs(transport, ref_map))
1230                consume_refs(transport, ref_map);
1231
1232        if (gsecondary) {
1233                transport_disconnect(gsecondary);
1234                gsecondary = NULL;
1235        }
1236}
1237
1238static int do_fetch(struct transport *transport,
1239                    struct refspec *rs)
1240{
1241        struct ref *ref_map;
1242        int autotags = (transport->remote->fetch_tags == 1);
1243        int retcode = 0;
1244        const struct ref *remote_refs;
1245        struct argv_array ref_prefixes = ARGV_ARRAY_INIT;
1246        int must_list_refs = 1;
1247
1248        if (tags == TAGS_DEFAULT) {
1249                if (transport->remote->fetch_tags == 2)
1250                        tags = TAGS_SET;
1251                if (transport->remote->fetch_tags == -1)
1252                        tags = TAGS_UNSET;
1253        }
1254
1255        /* if not appending, truncate FETCH_HEAD */
1256        if (!append && !dry_run) {
1257                retcode = truncate_fetch_head();
1258                if (retcode)
1259                        goto cleanup;
1260        }
1261
1262        if (rs->nr) {
1263                int i;
1264
1265                refspec_ref_prefixes(rs, &ref_prefixes);
1266
1267                /*
1268                 * We can avoid listing refs if all of them are exact
1269                 * OIDs
1270                 */
1271                must_list_refs = 0;
1272                for (i = 0; i < rs->nr; i++) {
1273                        if (!rs->items[i].exact_sha1) {
1274                                must_list_refs = 1;
1275                                break;
1276                        }
1277                }
1278        } else if (transport->remote && transport->remote->fetch.nr)
1279                refspec_ref_prefixes(&transport->remote->fetch, &ref_prefixes);
1280
1281        if (tags == TAGS_SET || tags == TAGS_DEFAULT) {
1282                must_list_refs = 1;
1283                if (ref_prefixes.argc)
1284                        argv_array_push(&ref_prefixes, "refs/tags/");
1285        }
1286
1287        if (must_list_refs)
1288                remote_refs = transport_get_remote_refs(transport, &ref_prefixes);
1289        else
1290                remote_refs = NULL;
1291
1292        argv_array_clear(&ref_prefixes);
1293
1294        ref_map = get_ref_map(transport->remote, remote_refs, rs,
1295                              tags, &autotags);
1296        if (!update_head_ok)
1297                check_not_current_branch(ref_map);
1298
1299        if (tags == TAGS_DEFAULT && autotags)
1300                transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
1301        if (prune) {
1302                /*
1303                 * We only prune based on refspecs specified
1304                 * explicitly (via command line or configuration); we
1305                 * don't care whether --tags was specified.
1306                 */
1307                if (rs->nr) {
1308                        prune_refs(rs, ref_map, transport->url);
1309                } else {
1310                        prune_refs(&transport->remote->fetch,
1311                                   ref_map,
1312                                   transport->url);
1313                }
1314        }
1315        if (fetch_refs(transport, ref_map) || consume_refs(transport, ref_map)) {
1316                free_refs(ref_map);
1317                retcode = 1;
1318                goto cleanup;
1319        }
1320        free_refs(ref_map);
1321
1322        /* if neither --no-tags nor --tags was specified, do automated tag
1323         * following ... */
1324        if (tags == TAGS_DEFAULT && autotags) {
1325                struct ref **tail = &ref_map;
1326                ref_map = NULL;
1327                find_non_local_tags(remote_refs, &ref_map, &tail);
1328                if (ref_map)
1329                        backfill_tags(transport, ref_map);
1330                free_refs(ref_map);
1331        }
1332
1333 cleanup:
1334        return retcode;
1335}
1336
1337static int get_one_remote_for_fetch(struct remote *remote, void *priv)
1338{
1339        struct string_list *list = priv;
1340        if (!remote->skip_default_update)
1341                string_list_append(list, remote->name);
1342        return 0;
1343}
1344
1345struct remote_group_data {
1346        const char *name;
1347        struct string_list *list;
1348};
1349
1350static int get_remote_group(const char *key, const char *value, void *priv)
1351{
1352        struct remote_group_data *g = priv;
1353
1354        if (skip_prefix(key, "remotes.", &key) && !strcmp(key, g->name)) {
1355                /* split list by white space */
1356                while (*value) {
1357                        size_t wordlen = strcspn(value, " \t\n");
1358
1359                        if (wordlen >= 1)
1360                                string_list_append_nodup(g->list,
1361                                                   xstrndup(value, wordlen));
1362                        value += wordlen + (value[wordlen] != '\0');
1363                }
1364        }
1365
1366        return 0;
1367}
1368
1369static int add_remote_or_group(const char *name, struct string_list *list)
1370{
1371        int prev_nr = list->nr;
1372        struct remote_group_data g;
1373        g.name = name; g.list = list;
1374
1375        git_config(get_remote_group, &g);
1376        if (list->nr == prev_nr) {
1377                struct remote *remote = remote_get(name);
1378                if (!remote_is_configured(remote, 0))
1379                        return 0;
1380                string_list_append(list, remote->name);
1381        }
1382        return 1;
1383}
1384
1385static void add_options_to_argv(struct argv_array *argv)
1386{
1387        if (dry_run)
1388                argv_array_push(argv, "--dry-run");
1389        if (prune != -1)
1390                argv_array_push(argv, prune ? "--prune" : "--no-prune");
1391        if (prune_tags != -1)
1392                argv_array_push(argv, prune_tags ? "--prune-tags" : "--no-prune-tags");
1393        if (update_head_ok)
1394                argv_array_push(argv, "--update-head-ok");
1395        if (force)
1396                argv_array_push(argv, "--force");
1397        if (keep)
1398                argv_array_push(argv, "--keep");
1399        if (recurse_submodules == RECURSE_SUBMODULES_ON)
1400                argv_array_push(argv, "--recurse-submodules");
1401        else if (recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND)
1402                argv_array_push(argv, "--recurse-submodules=on-demand");
1403        if (tags == TAGS_SET)
1404                argv_array_push(argv, "--tags");
1405        else if (tags == TAGS_UNSET)
1406                argv_array_push(argv, "--no-tags");
1407        if (verbosity >= 2)
1408                argv_array_push(argv, "-v");
1409        if (verbosity >= 1)
1410                argv_array_push(argv, "-v");
1411        else if (verbosity < 0)
1412                argv_array_push(argv, "-q");
1413
1414}
1415
1416static int fetch_multiple(struct string_list *list)
1417{
1418        int i, result = 0;
1419        struct argv_array argv = ARGV_ARRAY_INIT;
1420
1421        if (!append && !dry_run) {
1422                int errcode = truncate_fetch_head();
1423                if (errcode)
1424                        return errcode;
1425        }
1426
1427        argv_array_pushl(&argv, "fetch", "--append", NULL);
1428        add_options_to_argv(&argv);
1429
1430        for (i = 0; i < list->nr; i++) {
1431                const char *name = list->items[i].string;
1432                argv_array_push(&argv, name);
1433                if (verbosity >= 0)
1434                        printf(_("Fetching %s\n"), name);
1435                if (run_command_v_opt(argv.argv, RUN_GIT_CMD)) {
1436                        error(_("Could not fetch %s"), name);
1437                        result = 1;
1438                }
1439                argv_array_pop(&argv);
1440        }
1441
1442        argv_array_clear(&argv);
1443        return result;
1444}
1445
1446/*
1447 * Fetching from the promisor remote should use the given filter-spec
1448 * or inherit the default filter-spec from the config.
1449 */
1450static inline void fetch_one_setup_partial(struct remote *remote)
1451{
1452        /*
1453         * Explicit --no-filter argument overrides everything, regardless
1454         * of any prior partial clones and fetches.
1455         */
1456        if (filter_options.no_filter)
1457                return;
1458
1459        /*
1460         * If no prior partial clone/fetch and the current fetch DID NOT
1461         * request a partial-fetch, do a normal fetch.
1462         */
1463        if (!repository_format_partial_clone && !filter_options.choice)
1464                return;
1465
1466        /*
1467         * If this is the FIRST partial-fetch request, we enable partial
1468         * on this repo and remember the given filter-spec as the default
1469         * for subsequent fetches to this remote.
1470         */
1471        if (!repository_format_partial_clone && filter_options.choice) {
1472                partial_clone_register(remote->name, &filter_options);
1473                return;
1474        }
1475
1476        /*
1477         * We are currently limited to only ONE promisor remote and only
1478         * allow partial-fetches from the promisor remote.
1479         */
1480        if (strcmp(remote->name, repository_format_partial_clone)) {
1481                if (filter_options.choice)
1482                        die(_("--filter can only be used with the remote "
1483                              "configured in extensions.partialClone"));
1484                return;
1485        }
1486
1487        /*
1488         * Do a partial-fetch from the promisor remote using either the
1489         * explicitly given filter-spec or inherit the filter-spec from
1490         * the config.
1491         */
1492        if (!filter_options.choice)
1493                partial_clone_get_default_filter_spec(&filter_options);
1494        return;
1495}
1496
1497static int fetch_one(struct remote *remote, int argc, const char **argv, int prune_tags_ok)
1498{
1499        struct refspec rs = REFSPEC_INIT_FETCH;
1500        int i;
1501        int exit_code;
1502        int maybe_prune_tags;
1503        int remote_via_config = remote_is_configured(remote, 0);
1504
1505        if (!remote)
1506                die(_("No remote repository specified.  Please, specify either a URL or a\n"
1507                    "remote name from which new revisions should be fetched."));
1508
1509        gtransport = prepare_transport(remote, 1);
1510
1511        if (prune < 0) {
1512                /* no command line request */
1513                if (0 <= remote->prune)
1514                        prune = remote->prune;
1515                else if (0 <= fetch_prune_config)
1516                        prune = fetch_prune_config;
1517                else
1518                        prune = PRUNE_BY_DEFAULT;
1519        }
1520
1521        if (prune_tags < 0) {
1522                /* no command line request */
1523                if (0 <= remote->prune_tags)
1524                        prune_tags = remote->prune_tags;
1525                else if (0 <= fetch_prune_tags_config)
1526                        prune_tags = fetch_prune_tags_config;
1527                else
1528                        prune_tags = PRUNE_TAGS_BY_DEFAULT;
1529        }
1530
1531        maybe_prune_tags = prune_tags_ok && prune_tags;
1532        if (maybe_prune_tags && remote_via_config)
1533                refspec_append(&remote->fetch, TAG_REFSPEC);
1534
1535        if (maybe_prune_tags && (argc || !remote_via_config))
1536                refspec_append(&rs, TAG_REFSPEC);
1537
1538        for (i = 0; i < argc; i++) {
1539                if (!strcmp(argv[i], "tag")) {
1540                        char *tag;
1541                        i++;
1542                        if (i >= argc)
1543                                die(_("You need to specify a tag name."));
1544
1545                        tag = xstrfmt("refs/tags/%s:refs/tags/%s",
1546                                      argv[i], argv[i]);
1547                        refspec_append(&rs, tag);
1548                        free(tag);
1549                } else {
1550                        refspec_append(&rs, argv[i]);
1551                }
1552        }
1553
1554        if (server_options.nr)
1555                gtransport->server_options = &server_options;
1556
1557        sigchain_push_common(unlock_pack_on_signal);
1558        atexit(unlock_pack);
1559        sigchain_push(SIGPIPE, SIG_IGN);
1560        exit_code = do_fetch(gtransport, &rs);
1561        sigchain_pop(SIGPIPE);
1562        refspec_clear(&rs);
1563        transport_disconnect(gtransport);
1564        gtransport = NULL;
1565        return exit_code;
1566}
1567
1568int cmd_fetch(int argc, const char **argv, const char *prefix)
1569{
1570        int i;
1571        struct string_list list = STRING_LIST_INIT_DUP;
1572        struct remote *remote = NULL;
1573        int result = 0;
1574        int prune_tags_ok = 1;
1575        struct argv_array argv_gc_auto = ARGV_ARRAY_INIT;
1576
1577        packet_trace_identity("fetch");
1578
1579        fetch_if_missing = 0;
1580
1581        /* Record the command line for the reflog */
1582        strbuf_addstr(&default_rla, "fetch");
1583        for (i = 1; i < argc; i++)
1584                strbuf_addf(&default_rla, " %s", argv[i]);
1585
1586        fetch_config_from_gitmodules(&max_children, &recurse_submodules);
1587        git_config(git_fetch_config, NULL);
1588
1589        argc = parse_options(argc, argv, prefix,
1590                             builtin_fetch_options, builtin_fetch_usage, 0);
1591
1592        if (deepen_relative) {
1593                if (deepen_relative < 0)
1594                        die(_("Negative depth in --deepen is not supported"));
1595                if (depth)
1596                        die(_("--deepen and --depth are mutually exclusive"));
1597                depth = xstrfmt("%d", deepen_relative);
1598        }
1599        if (unshallow) {
1600                if (depth)
1601                        die(_("--depth and --unshallow cannot be used together"));
1602                else if (!is_repository_shallow(the_repository))
1603                        die(_("--unshallow on a complete repository does not make sense"));
1604                else
1605                        depth = xstrfmt("%d", INFINITE_DEPTH);
1606        }
1607
1608        /* no need to be strict, transport_set_option() will validate it again */
1609        if (depth && atoi(depth) < 1)
1610                die(_("depth %s is not a positive number"), depth);
1611        if (depth || deepen_since || deepen_not.nr)
1612                deepen = 1;
1613
1614        if (filter_options.choice && !repository_format_partial_clone)
1615                die("--filter can only be used when extensions.partialClone is set");
1616
1617        if (all) {
1618                if (argc == 1)
1619                        die(_("fetch --all does not take a repository argument"));
1620                else if (argc > 1)
1621                        die(_("fetch --all does not make sense with refspecs"));
1622                (void) for_each_remote(get_one_remote_for_fetch, &list);
1623        } else if (argc == 0) {
1624                /* No arguments -- use default remote */
1625                remote = remote_get(NULL);
1626        } else if (multiple) {
1627                /* All arguments are assumed to be remotes or groups */
1628                for (i = 0; i < argc; i++)
1629                        if (!add_remote_or_group(argv[i], &list))
1630                                die(_("No such remote or remote group: %s"), argv[i]);
1631        } else {
1632                /* Single remote or group */
1633                (void) add_remote_or_group(argv[0], &list);
1634                if (list.nr > 1) {
1635                        /* More than one remote */
1636                        if (argc > 1)
1637                                die(_("Fetching a group and specifying refspecs does not make sense"));
1638                } else {
1639                        /* Zero or one remotes */
1640                        remote = remote_get(argv[0]);
1641                        prune_tags_ok = (argc == 1);
1642                        argc--;
1643                        argv++;
1644                }
1645        }
1646
1647        if (remote) {
1648                if (filter_options.choice || repository_format_partial_clone)
1649                        fetch_one_setup_partial(remote);
1650                result = fetch_one(remote, argc, argv, prune_tags_ok);
1651        } else {
1652                if (filter_options.choice)
1653                        die(_("--filter can only be used with the remote "
1654                              "configured in extensions.partialclone"));
1655                /* TODO should this also die if we have a previous partial-clone? */
1656                result = fetch_multiple(&list);
1657        }
1658
1659        if (!result && (recurse_submodules != RECURSE_SUBMODULES_OFF)) {
1660                struct argv_array options = ARGV_ARRAY_INIT;
1661
1662                add_options_to_argv(&options);
1663                result = fetch_populated_submodules(the_repository,
1664                                                    &options,
1665                                                    submodule_prefix,
1666                                                    recurse_submodules,
1667                                                    recurse_submodules_default,
1668                                                    verbosity < 0,
1669                                                    max_children);
1670                argv_array_clear(&options);
1671        }
1672
1673        string_list_clear(&list, 0);
1674
1675        close_all_packs(the_repository->objects);
1676
1677        argv_array_pushl(&argv_gc_auto, "gc", "--auto", NULL);
1678        if (verbosity < 0)
1679                argv_array_push(&argv_gc_auto, "--quiet");
1680        run_command_v_opt(argv_gc_auto.argv, RUN_GIT_CMD);
1681        argv_array_clear(&argv_gc_auto);
1682
1683        return result;
1684}