Andrew's git / gitweb.git / transport.c
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transport.con commit rebase-interactive: append_todo_help() changes (af1fc3a)
   1#include "cache.h"
   2#include "config.h"
   3#include "transport.h"
   4#include "run-command.h"
   5#include "pkt-line.h"
   6#include "fetch-pack.h"
   7#include "remote.h"
   8#include "connect.h"
   9#include "send-pack.h"
  10#include "walker.h"
  11#include "bundle.h"
  12#include "dir.h"
  13#include "refs.h"
  14#include "refspec.h"
  15#include "branch.h"
  16#include "url.h"
  17#include "submodule.h"
  18#include "string-list.h"
  19#include "sha1-array.h"
  20#include "sigchain.h"
  21#include "transport-internal.h"
  22#include "protocol.h"
  23#include "object-store.h"
  24#include "color.h"
  25
  26static int transport_use_color = -1;
  27static char transport_colors[][COLOR_MAXLEN] = {
  28        GIT_COLOR_RESET,
  29        GIT_COLOR_RED           /* REJECTED */
  30};
  31
  32enum color_transport {
  33        TRANSPORT_COLOR_RESET = 0,
  34        TRANSPORT_COLOR_REJECTED = 1
  35};
  36
  37static int transport_color_config(void)
  38{
  39        const char *keys[] = {
  40                "color.transport.reset",
  41                "color.transport.rejected"
  42        }, *key = "color.transport";
  43        char *value;
  44        int i;
  45        static int initialized;
  46
  47        if (initialized)
  48                return 0;
  49        initialized = 1;
  50
  51        if (!git_config_get_string(key, &value))
  52                transport_use_color = git_config_colorbool(key, value);
  53
  54        if (!want_color_stderr(transport_use_color))
  55                return 0;
  56
  57        for (i = 0; i < ARRAY_SIZE(keys); i++)
  58                if (!git_config_get_string(keys[i], &value)) {
  59                        if (!value)
  60                                return config_error_nonbool(keys[i]);
  61                        if (color_parse(value, transport_colors[i]) < 0)
  62                                return -1;
  63                }
  64
  65        return 0;
  66}
  67
  68static const char *transport_get_color(enum color_transport ix)
  69{
  70        if (want_color_stderr(transport_use_color))
  71                return transport_colors[ix];
  72        return "";
  73}
  74
  75static void set_upstreams(struct transport *transport, struct ref *refs,
  76        int pretend)
  77{
  78        struct ref *ref;
  79        for (ref = refs; ref; ref = ref->next) {
  80                const char *localname;
  81                const char *tmp;
  82                const char *remotename;
  83                int flag = 0;
  84                /*
  85                 * Check suitability for tracking. Must be successful /
  86                 * already up-to-date ref create/modify (not delete).
  87                 */
  88                if (ref->status != REF_STATUS_OK &&
  89                        ref->status != REF_STATUS_UPTODATE)
  90                        continue;
  91                if (!ref->peer_ref)
  92                        continue;
  93                if (is_null_oid(&ref->new_oid))
  94                        continue;
  95
  96                /* Follow symbolic refs (mainly for HEAD). */
  97                localname = ref->peer_ref->name;
  98                remotename = ref->name;
  99                tmp = resolve_ref_unsafe(localname, RESOLVE_REF_READING,
 100                                         NULL, &flag);
 101                if (tmp && flag & REF_ISSYMREF &&
 102                        starts_with(tmp, "refs/heads/"))
 103                        localname = tmp;
 104
 105                /* Both source and destination must be local branches. */
 106                if (!localname || !starts_with(localname, "refs/heads/"))
 107                        continue;
 108                if (!remotename || !starts_with(remotename, "refs/heads/"))
 109                        continue;
 110
 111                if (!pretend)
 112                        install_branch_config(BRANCH_CONFIG_VERBOSE,
 113                                localname + 11, transport->remote->name,
 114                                remotename);
 115                else
 116                        printf(_("Would set upstream of '%s' to '%s' of '%s'\n"),
 117                                localname + 11, remotename + 11,
 118                                transport->remote->name);
 119        }
 120}
 121
 122struct bundle_transport_data {
 123        int fd;
 124        struct bundle_header header;
 125};
 126
 127static struct ref *get_refs_from_bundle(struct transport *transport,
 128                                        int for_push,
 129                                        const struct argv_array *ref_prefixes)
 130{
 131        struct bundle_transport_data *data = transport->data;
 132        struct ref *result = NULL;
 133        int i;
 134
 135        if (for_push)
 136                return NULL;
 137
 138        if (data->fd > 0)
 139                close(data->fd);
 140        data->fd = read_bundle_header(transport->url, &data->header);
 141        if (data->fd < 0)
 142                die(_("could not read bundle '%s'"), transport->url);
 143        for (i = 0; i < data->header.references.nr; i++) {
 144                struct ref_list_entry *e = data->header.references.list + i;
 145                struct ref *ref = alloc_ref(e->name);
 146                oidcpy(&ref->old_oid, &e->oid);
 147                ref->next = result;
 148                result = ref;
 149        }
 150        return result;
 151}
 152
 153static int fetch_refs_from_bundle(struct transport *transport,
 154                               int nr_heads, struct ref **to_fetch)
 155{
 156        struct bundle_transport_data *data = transport->data;
 157        return unbundle(the_repository, &data->header, data->fd,
 158                        transport->progress ? BUNDLE_VERBOSE : 0);
 159}
 160
 161static int close_bundle(struct transport *transport)
 162{
 163        struct bundle_transport_data *data = transport->data;
 164        if (data->fd > 0)
 165                close(data->fd);
 166        free(data);
 167        return 0;
 168}
 169
 170struct git_transport_data {
 171        struct git_transport_options options;
 172        struct child_process *conn;
 173        int fd[2];
 174        unsigned got_remote_heads : 1;
 175        enum protocol_version version;
 176        struct oid_array extra_have;
 177        struct oid_array shallow;
 178};
 179
 180static int set_git_option(struct git_transport_options *opts,
 181                          const char *name, const char *value)
 182{
 183        if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 184                opts->uploadpack = value;
 185                return 0;
 186        } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 187                opts->receivepack = value;
 188                return 0;
 189        } else if (!strcmp(name, TRANS_OPT_THIN)) {
 190                opts->thin = !!value;
 191                return 0;
 192        } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
 193                opts->followtags = !!value;
 194                return 0;
 195        } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 196                opts->keep = !!value;
 197                return 0;
 198        } else if (!strcmp(name, TRANS_OPT_UPDATE_SHALLOW)) {
 199                opts->update_shallow = !!value;
 200                return 0;
 201        } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 202                if (!value)
 203                        opts->depth = 0;
 204                else {
 205                        char *end;
 206                        opts->depth = strtol(value, &end, 0);
 207                        if (*end)
 208                                die(_("transport: invalid depth option '%s'"), value);
 209                }
 210                return 0;
 211        } else if (!strcmp(name, TRANS_OPT_DEEPEN_SINCE)) {
 212                opts->deepen_since = value;
 213                return 0;
 214        } else if (!strcmp(name, TRANS_OPT_DEEPEN_NOT)) {
 215                opts->deepen_not = (const struct string_list *)value;
 216                return 0;
 217        } else if (!strcmp(name, TRANS_OPT_DEEPEN_RELATIVE)) {
 218                opts->deepen_relative = !!value;
 219                return 0;
 220        } else if (!strcmp(name, TRANS_OPT_FROM_PROMISOR)) {
 221                opts->from_promisor = !!value;
 222                return 0;
 223        } else if (!strcmp(name, TRANS_OPT_NO_DEPENDENTS)) {
 224                opts->no_dependents = !!value;
 225                return 0;
 226        } else if (!strcmp(name, TRANS_OPT_LIST_OBJECTS_FILTER)) {
 227                parse_list_objects_filter(&opts->filter_options, value);
 228                return 0;
 229        }
 230        return 1;
 231}
 232
 233static int connect_setup(struct transport *transport, int for_push)
 234{
 235        struct git_transport_data *data = transport->data;
 236        int flags = transport->verbose > 0 ? CONNECT_VERBOSE : 0;
 237
 238        if (data->conn)
 239                return 0;
 240
 241        switch (transport->family) {
 242        case TRANSPORT_FAMILY_ALL: break;
 243        case TRANSPORT_FAMILY_IPV4: flags |= CONNECT_IPV4; break;
 244        case TRANSPORT_FAMILY_IPV6: flags |= CONNECT_IPV6; break;
 245        }
 246
 247        data->conn = git_connect(data->fd, transport->url,
 248                                 for_push ? data->options.receivepack :
 249                                 data->options.uploadpack,
 250                                 flags);
 251
 252        return 0;
 253}
 254
 255/*
 256 * Obtains the protocol version from the transport and writes it to
 257 * transport->data->version, first connecting if not already connected.
 258 *
 259 * If the protocol version is one that allows skipping the listing of remote
 260 * refs, and must_list_refs is 0, the listing of remote refs is skipped and
 261 * this function returns NULL. Otherwise, this function returns the list of
 262 * remote refs.
 263 */
 264static struct ref *handshake(struct transport *transport, int for_push,
 265                             const struct argv_array *ref_prefixes,
 266                             int must_list_refs)
 267{
 268        struct git_transport_data *data = transport->data;
 269        struct ref *refs = NULL;
 270        struct packet_reader reader;
 271
 272        connect_setup(transport, for_push);
 273
 274        packet_reader_init(&reader, data->fd[0], NULL, 0,
 275                           PACKET_READ_CHOMP_NEWLINE |
 276                           PACKET_READ_GENTLE_ON_EOF);
 277
 278        data->version = discover_version(&reader);
 279        switch (data->version) {
 280        case protocol_v2:
 281                if (must_list_refs)
 282                        get_remote_refs(data->fd[1], &reader, &refs, for_push,
 283                                        ref_prefixes,
 284                                        transport->server_options);
 285                break;
 286        case protocol_v1:
 287        case protocol_v0:
 288                get_remote_heads(&reader, &refs,
 289                                 for_push ? REF_NORMAL : 0,
 290                                 &data->extra_have,
 291                                 &data->shallow);
 292                break;
 293        case protocol_unknown_version:
 294                BUG("unknown protocol version");
 295        }
 296        data->got_remote_heads = 1;
 297
 298        if (reader.line_peeked)
 299                BUG("buffer must be empty at the end of handshake()");
 300
 301        return refs;
 302}
 303
 304static struct ref *get_refs_via_connect(struct transport *transport, int for_push,
 305                                        const struct argv_array *ref_prefixes)
 306{
 307        return handshake(transport, for_push, ref_prefixes, 1);
 308}
 309
 310static int fetch_refs_via_pack(struct transport *transport,
 311                               int nr_heads, struct ref **to_fetch)
 312{
 313        int ret = 0;
 314        struct git_transport_data *data = transport->data;
 315        struct ref *refs = NULL;
 316        char *dest = xstrdup(transport->url);
 317        struct fetch_pack_args args;
 318        struct ref *refs_tmp = NULL;
 319
 320        memset(&args, 0, sizeof(args));
 321        args.uploadpack = data->options.uploadpack;
 322        args.keep_pack = data->options.keep;
 323        args.lock_pack = 1;
 324        args.use_thin_pack = data->options.thin;
 325        args.include_tag = data->options.followtags;
 326        args.verbose = (transport->verbose > 1);
 327        args.quiet = (transport->verbose < 0);
 328        args.no_progress = !transport->progress;
 329        args.depth = data->options.depth;
 330        args.deepen_since = data->options.deepen_since;
 331        args.deepen_not = data->options.deepen_not;
 332        args.deepen_relative = data->options.deepen_relative;
 333        args.check_self_contained_and_connected =
 334                data->options.check_self_contained_and_connected;
 335        args.cloning = transport->cloning;
 336        args.update_shallow = data->options.update_shallow;
 337        args.from_promisor = data->options.from_promisor;
 338        args.no_dependents = data->options.no_dependents;
 339        args.filter_options = data->options.filter_options;
 340        args.stateless_rpc = transport->stateless_rpc;
 341        args.server_options = transport->server_options;
 342        args.negotiation_tips = data->options.negotiation_tips;
 343
 344        if (!data->got_remote_heads) {
 345                int i;
 346                int must_list_refs = 0;
 347                for (i = 0; i < nr_heads; i++) {
 348                        if (!to_fetch[i]->exact_oid) {
 349                                must_list_refs = 1;
 350                                break;
 351                        }
 352                }
 353                refs_tmp = handshake(transport, 0, NULL, must_list_refs);
 354        }
 355
 356        switch (data->version) {
 357        case protocol_v2:
 358                refs = fetch_pack(&args, data->fd, data->conn,
 359                                  refs_tmp ? refs_tmp : transport->remote_refs,
 360                                  dest, to_fetch, nr_heads, &data->shallow,
 361                                  &transport->pack_lockfile, data->version);
 362                break;
 363        case protocol_v1:
 364        case protocol_v0:
 365                refs = fetch_pack(&args, data->fd, data->conn,
 366                                  refs_tmp ? refs_tmp : transport->remote_refs,
 367                                  dest, to_fetch, nr_heads, &data->shallow,
 368                                  &transport->pack_lockfile, data->version);
 369                break;
 370        case protocol_unknown_version:
 371                BUG("unknown protocol version");
 372        }
 373
 374        close(data->fd[0]);
 375        close(data->fd[1]);
 376        if (finish_connect(data->conn))
 377                ret = -1;
 378        data->conn = NULL;
 379        data->got_remote_heads = 0;
 380        data->options.self_contained_and_connected =
 381                args.self_contained_and_connected;
 382        data->options.connectivity_checked = args.connectivity_checked;
 383
 384        if (refs == NULL)
 385                ret = -1;
 386        if (report_unmatched_refs(to_fetch, nr_heads))
 387                ret = -1;
 388
 389        free_refs(refs_tmp);
 390        free_refs(refs);
 391        free(dest);
 392        return ret;
 393}
 394
 395static int push_had_errors(struct ref *ref)
 396{
 397        for (; ref; ref = ref->next) {
 398                switch (ref->status) {
 399                case REF_STATUS_NONE:
 400                case REF_STATUS_UPTODATE:
 401                case REF_STATUS_OK:
 402                        break;
 403                default:
 404                        return 1;
 405                }
 406        }
 407        return 0;
 408}
 409
 410int transport_refs_pushed(struct ref *ref)
 411{
 412        for (; ref; ref = ref->next) {
 413                switch(ref->status) {
 414                case REF_STATUS_NONE:
 415                case REF_STATUS_UPTODATE:
 416                        break;
 417                default:
 418                        return 1;
 419                }
 420        }
 421        return 0;
 422}
 423
 424void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 425{
 426        struct refspec_item rs;
 427
 428        if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 429                return;
 430
 431        rs.src = ref->name;
 432        rs.dst = NULL;
 433
 434        if (!remote_find_tracking(remote, &rs)) {
 435                if (verbose)
 436                        fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 437                if (ref->deletion) {
 438                        delete_ref(NULL, rs.dst, NULL, 0);
 439                } else
 440                        update_ref("update by push", rs.dst, &ref->new_oid,
 441                                   NULL, 0, 0);
 442                free(rs.dst);
 443        }
 444}
 445
 446static void print_ref_status(char flag, const char *summary,
 447                             struct ref *to, struct ref *from, const char *msg,
 448                             int porcelain, int summary_width)
 449{
 450        if (porcelain) {
 451                if (from)
 452                        fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 453                else
 454                        fprintf(stdout, "%c\t:%s\t", flag, to->name);
 455                if (msg)
 456                        fprintf(stdout, "%s (%s)\n", summary, msg);
 457                else
 458                        fprintf(stdout, "%s\n", summary);
 459        } else {
 460                const char *red = "", *reset = "";
 461                if (push_had_errors(to)) {
 462                        red = transport_get_color(TRANSPORT_COLOR_REJECTED);
 463                        reset = transport_get_color(TRANSPORT_COLOR_RESET);
 464                }
 465                fprintf(stderr, " %s%c %-*s%s ", red, flag, summary_width,
 466                        summary, reset);
 467                if (from)
 468                        fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 469                else
 470                        fputs(prettify_refname(to->name), stderr);
 471                if (msg) {
 472                        fputs(" (", stderr);
 473                        fputs(msg, stderr);
 474                        fputc(')', stderr);
 475                }
 476                fputc('\n', stderr);
 477        }
 478}
 479
 480static void print_ok_ref_status(struct ref *ref, int porcelain, int summary_width)
 481{
 482        if (ref->deletion)
 483                print_ref_status('-', "[deleted]", ref, NULL, NULL,
 484                                 porcelain, summary_width);
 485        else if (is_null_oid(&ref->old_oid))
 486                print_ref_status('*',
 487                        (starts_with(ref->name, "refs/tags/") ? "[new tag]" :
 488                        "[new branch]"),
 489                        ref, ref->peer_ref, NULL, porcelain, summary_width);
 490        else {
 491                struct strbuf quickref = STRBUF_INIT;
 492                char type;
 493                const char *msg;
 494
 495                strbuf_add_unique_abbrev(&quickref, &ref->old_oid,
 496                                         DEFAULT_ABBREV);
 497                if (ref->forced_update) {
 498                        strbuf_addstr(&quickref, "...");
 499                        type = '+';
 500                        msg = "forced update";
 501                } else {
 502                        strbuf_addstr(&quickref, "..");
 503                        type = ' ';
 504                        msg = NULL;
 505                }
 506                strbuf_add_unique_abbrev(&quickref, &ref->new_oid,
 507                                         DEFAULT_ABBREV);
 508
 509                print_ref_status(type, quickref.buf, ref, ref->peer_ref, msg,
 510                                 porcelain, summary_width);
 511                strbuf_release(&quickref);
 512        }
 513}
 514
 515static int print_one_push_status(struct ref *ref, const char *dest, int count,
 516                                 int porcelain, int summary_width)
 517{
 518        if (!count) {
 519                char *url = transport_anonymize_url(dest);
 520                fprintf(porcelain ? stdout : stderr, "To %s\n", url);
 521                free(url);
 522        }
 523
 524        switch(ref->status) {
 525        case REF_STATUS_NONE:
 526                print_ref_status('X', "[no match]", ref, NULL, NULL,
 527                                 porcelain, summary_width);
 528                break;
 529        case REF_STATUS_REJECT_NODELETE:
 530                print_ref_status('!', "[rejected]", ref, NULL,
 531                                 "remote does not support deleting refs",
 532                                 porcelain, summary_width);
 533                break;
 534        case REF_STATUS_UPTODATE:
 535                print_ref_status('=', "[up to date]", ref,
 536                                 ref->peer_ref, NULL, porcelain, summary_width);
 537                break;
 538        case REF_STATUS_REJECT_NONFASTFORWARD:
 539                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 540                                 "non-fast-forward", porcelain, summary_width);
 541                break;
 542        case REF_STATUS_REJECT_ALREADY_EXISTS:
 543                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 544                                 "already exists", porcelain, summary_width);
 545                break;
 546        case REF_STATUS_REJECT_FETCH_FIRST:
 547                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 548                                 "fetch first", porcelain, summary_width);
 549                break;
 550        case REF_STATUS_REJECT_NEEDS_FORCE:
 551                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 552                                 "needs force", porcelain, summary_width);
 553                break;
 554        case REF_STATUS_REJECT_STALE:
 555                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 556                                 "stale info", porcelain, summary_width);
 557                break;
 558        case REF_STATUS_REJECT_SHALLOW:
 559                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 560                                 "new shallow roots not allowed",
 561                                 porcelain, summary_width);
 562                break;
 563        case REF_STATUS_REMOTE_REJECT:
 564                print_ref_status('!', "[remote rejected]", ref,
 565                                 ref->deletion ? NULL : ref->peer_ref,
 566                                 ref->remote_status, porcelain, summary_width);
 567                break;
 568        case REF_STATUS_EXPECTING_REPORT:
 569                print_ref_status('!', "[remote failure]", ref,
 570                                 ref->deletion ? NULL : ref->peer_ref,
 571                                 "remote failed to report status",
 572                                 porcelain, summary_width);
 573                break;
 574        case REF_STATUS_ATOMIC_PUSH_FAILED:
 575                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 576                                 "atomic push failed", porcelain, summary_width);
 577                break;
 578        case REF_STATUS_OK:
 579                print_ok_ref_status(ref, porcelain, summary_width);
 580                break;
 581        }
 582
 583        return 1;
 584}
 585
 586static int measure_abbrev(const struct object_id *oid, int sofar)
 587{
 588        char hex[GIT_MAX_HEXSZ + 1];
 589        int w = find_unique_abbrev_r(hex, oid, DEFAULT_ABBREV);
 590
 591        return (w < sofar) ? sofar : w;
 592}
 593
 594int transport_summary_width(const struct ref *refs)
 595{
 596        int maxw = -1;
 597
 598        for (; refs; refs = refs->next) {
 599                maxw = measure_abbrev(&refs->old_oid, maxw);
 600                maxw = measure_abbrev(&refs->new_oid, maxw);
 601        }
 602        if (maxw < 0)
 603                maxw = FALLBACK_DEFAULT_ABBREV;
 604        return (2 * maxw + 3);
 605}
 606
 607void transport_print_push_status(const char *dest, struct ref *refs,
 608                                  int verbose, int porcelain, unsigned int *reject_reasons)
 609{
 610        struct ref *ref;
 611        int n = 0;
 612        char *head;
 613        int summary_width = transport_summary_width(refs);
 614
 615        if (transport_color_config() < 0)
 616                warning(_("could not parse transport.color.* config"));
 617
 618        head = resolve_refdup("HEAD", RESOLVE_REF_READING, NULL, NULL);
 619
 620        if (verbose) {
 621                for (ref = refs; ref; ref = ref->next)
 622                        if (ref->status == REF_STATUS_UPTODATE)
 623                                n += print_one_push_status(ref, dest, n,
 624                                                           porcelain, summary_width);
 625        }
 626
 627        for (ref = refs; ref; ref = ref->next)
 628                if (ref->status == REF_STATUS_OK)
 629                        n += print_one_push_status(ref, dest, n,
 630                                                   porcelain, summary_width);
 631
 632        *reject_reasons = 0;
 633        for (ref = refs; ref; ref = ref->next) {
 634                if (ref->status != REF_STATUS_NONE &&
 635                    ref->status != REF_STATUS_UPTODATE &&
 636                    ref->status != REF_STATUS_OK)
 637                        n += print_one_push_status(ref, dest, n,
 638                                                   porcelain, summary_width);
 639                if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
 640                        if (head != NULL && !strcmp(head, ref->name))
 641                                *reject_reasons |= REJECT_NON_FF_HEAD;
 642                        else
 643                                *reject_reasons |= REJECT_NON_FF_OTHER;
 644                } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
 645                        *reject_reasons |= REJECT_ALREADY_EXISTS;
 646                } else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
 647                        *reject_reasons |= REJECT_FETCH_FIRST;
 648                } else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
 649                        *reject_reasons |= REJECT_NEEDS_FORCE;
 650                }
 651        }
 652        free(head);
 653}
 654
 655static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 656{
 657        struct git_transport_data *data = transport->data;
 658        struct send_pack_args args;
 659        int ret = 0;
 660
 661        if (transport_color_config() < 0)
 662                return -1;
 663
 664        if (!data->got_remote_heads)
 665                get_refs_via_connect(transport, 1, NULL);
 666
 667        memset(&args, 0, sizeof(args));
 668        args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 669        args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 670        args.use_thin_pack = data->options.thin;
 671        args.verbose = (transport->verbose > 0);
 672        args.quiet = (transport->verbose < 0);
 673        args.progress = transport->progress;
 674        args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 675        args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
 676        args.atomic = !!(flags & TRANSPORT_PUSH_ATOMIC);
 677        args.push_options = transport->push_options;
 678        args.url = transport->url;
 679
 680        if (flags & TRANSPORT_PUSH_CERT_ALWAYS)
 681                args.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 682        else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED)
 683                args.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 684        else
 685                args.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 686
 687        switch (data->version) {
 688        case protocol_v2:
 689                die(_("support for protocol v2 not implemented yet"));
 690                break;
 691        case protocol_v1:
 692        case protocol_v0:
 693                ret = send_pack(&args, data->fd, data->conn, remote_refs,
 694                                &data->extra_have);
 695                break;
 696        case protocol_unknown_version:
 697                BUG("unknown protocol version");
 698        }
 699
 700        close(data->fd[1]);
 701        close(data->fd[0]);
 702        ret |= finish_connect(data->conn);
 703        data->conn = NULL;
 704        data->got_remote_heads = 0;
 705
 706        return ret;
 707}
 708
 709static int connect_git(struct transport *transport, const char *name,
 710                       const char *executable, int fd[2])
 711{
 712        struct git_transport_data *data = transport->data;
 713        data->conn = git_connect(data->fd, transport->url,
 714                                 executable, 0);
 715        fd[0] = data->fd[0];
 716        fd[1] = data->fd[1];
 717        return 0;
 718}
 719
 720static int disconnect_git(struct transport *transport)
 721{
 722        struct git_transport_data *data = transport->data;
 723        if (data->conn) {
 724                if (data->got_remote_heads)
 725                        packet_flush(data->fd[1]);
 726                close(data->fd[0]);
 727                close(data->fd[1]);
 728                finish_connect(data->conn);
 729        }
 730
 731        free(data);
 732        return 0;
 733}
 734
 735static struct transport_vtable taken_over_vtable = {
 736        1,
 737        NULL,
 738        get_refs_via_connect,
 739        fetch_refs_via_pack,
 740        git_transport_push,
 741        NULL,
 742        disconnect_git
 743};
 744
 745void transport_take_over(struct transport *transport,
 746                         struct child_process *child)
 747{
 748        struct git_transport_data *data;
 749
 750        if (!transport->smart_options)
 751                BUG("taking over transport requires non-NULL "
 752                    "smart_options field.");
 753
 754        data = xcalloc(1, sizeof(*data));
 755        data->options = *transport->smart_options;
 756        data->conn = child;
 757        data->fd[0] = data->conn->out;
 758        data->fd[1] = data->conn->in;
 759        data->got_remote_heads = 0;
 760        transport->data = data;
 761
 762        transport->vtable = &taken_over_vtable;
 763        transport->smart_options = &(data->options);
 764
 765        transport->cannot_reuse = 1;
 766}
 767
 768static int is_file(const char *url)
 769{
 770        struct stat buf;
 771        if (stat(url, &buf))
 772                return 0;
 773        return S_ISREG(buf.st_mode);
 774}
 775
 776static int external_specification_len(const char *url)
 777{
 778        return strchr(url, ':') - url;
 779}
 780
 781static const struct string_list *protocol_whitelist(void)
 782{
 783        static int enabled = -1;
 784        static struct string_list allowed = STRING_LIST_INIT_DUP;
 785
 786        if (enabled < 0) {
 787                const char *v = getenv("GIT_ALLOW_PROTOCOL");
 788                if (v) {
 789                        string_list_split(&allowed, v, ':', -1);
 790                        string_list_sort(&allowed);
 791                        enabled = 1;
 792                } else {
 793                        enabled = 0;
 794                }
 795        }
 796
 797        return enabled ? &allowed : NULL;
 798}
 799
 800enum protocol_allow_config {
 801        PROTOCOL_ALLOW_NEVER = 0,
 802        PROTOCOL_ALLOW_USER_ONLY,
 803        PROTOCOL_ALLOW_ALWAYS
 804};
 805
 806static enum protocol_allow_config parse_protocol_config(const char *key,
 807                                                        const char *value)
 808{
 809        if (!strcasecmp(value, "always"))
 810                return PROTOCOL_ALLOW_ALWAYS;
 811        else if (!strcasecmp(value, "never"))
 812                return PROTOCOL_ALLOW_NEVER;
 813        else if (!strcasecmp(value, "user"))
 814                return PROTOCOL_ALLOW_USER_ONLY;
 815
 816        die(_("unknown value for config '%s': %s"), key, value);
 817}
 818
 819static enum protocol_allow_config get_protocol_config(const char *type)
 820{
 821        char *key = xstrfmt("protocol.%s.allow", type);
 822        char *value;
 823
 824        /* first check the per-protocol config */
 825        if (!git_config_get_string(key, &value)) {
 826                enum protocol_allow_config ret =
 827                        parse_protocol_config(key, value);
 828                free(key);
 829                free(value);
 830                return ret;
 831        }
 832        free(key);
 833
 834        /* if defined, fallback to user-defined default for unknown protocols */
 835        if (!git_config_get_string("protocol.allow", &value)) {
 836                enum protocol_allow_config ret =
 837                        parse_protocol_config("protocol.allow", value);
 838                free(value);
 839                return ret;
 840        }
 841
 842        /* fallback to built-in defaults */
 843        /* known safe */
 844        if (!strcmp(type, "http") ||
 845            !strcmp(type, "https") ||
 846            !strcmp(type, "git") ||
 847            !strcmp(type, "ssh") ||
 848            !strcmp(type, "file"))
 849                return PROTOCOL_ALLOW_ALWAYS;
 850
 851        /* known scary; err on the side of caution */
 852        if (!strcmp(type, "ext"))
 853                return PROTOCOL_ALLOW_NEVER;
 854
 855        /* unknown; by default let them be used only directly by the user */
 856        return PROTOCOL_ALLOW_USER_ONLY;
 857}
 858
 859int is_transport_allowed(const char *type, int from_user)
 860{
 861        const struct string_list *whitelist = protocol_whitelist();
 862        if (whitelist)
 863                return string_list_has_string(whitelist, type);
 864
 865        switch (get_protocol_config(type)) {
 866        case PROTOCOL_ALLOW_ALWAYS:
 867                return 1;
 868        case PROTOCOL_ALLOW_NEVER:
 869                return 0;
 870        case PROTOCOL_ALLOW_USER_ONLY:
 871                if (from_user < 0)
 872                        from_user = git_env_bool("GIT_PROTOCOL_FROM_USER", 1);
 873                return from_user;
 874        }
 875
 876        BUG("invalid protocol_allow_config type");
 877}
 878
 879void transport_check_allowed(const char *type)
 880{
 881        if (!is_transport_allowed(type, -1))
 882                die(_("transport '%s' not allowed"), type);
 883}
 884
 885static struct transport_vtable bundle_vtable = {
 886        0,
 887        NULL,
 888        get_refs_from_bundle,
 889        fetch_refs_from_bundle,
 890        NULL,
 891        NULL,
 892        close_bundle
 893};
 894
 895static struct transport_vtable builtin_smart_vtable = {
 896        1,
 897        NULL,
 898        get_refs_via_connect,
 899        fetch_refs_via_pack,
 900        git_transport_push,
 901        connect_git,
 902        disconnect_git
 903};
 904
 905struct transport *transport_get(struct remote *remote, const char *url)
 906{
 907        const char *helper;
 908        struct transport *ret = xcalloc(1, sizeof(*ret));
 909
 910        ret->progress = isatty(2);
 911
 912        if (!remote)
 913                BUG("No remote provided to transport_get()");
 914
 915        ret->got_remote_refs = 0;
 916        ret->remote = remote;
 917        helper = remote->foreign_vcs;
 918
 919        if (!url && remote->url)
 920                url = remote->url[0];
 921        ret->url = url;
 922
 923        /* maybe it is a foreign URL? */
 924        if (url) {
 925                const char *p = url;
 926
 927                while (is_urlschemechar(p == url, *p))
 928                        p++;
 929                if (starts_with(p, "::"))
 930                        helper = xstrndup(url, p - url);
 931        }
 932
 933        if (helper) {
 934                transport_helper_init(ret, helper);
 935        } else if (starts_with(url, "rsync:")) {
 936                die(_("git-over-rsync is no longer supported"));
 937        } else if (url_is_local_not_ssh(url) && is_file(url) && is_bundle(url, 1)) {
 938                struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 939                transport_check_allowed("file");
 940                ret->data = data;
 941                ret->vtable = &bundle_vtable;
 942                ret->smart_options = NULL;
 943        } else if (!is_url(url)
 944                || starts_with(url, "file://")
 945                || starts_with(url, "git://")
 946                || starts_with(url, "ssh://")
 947                || starts_with(url, "git+ssh://") /* deprecated - do not use */
 948                || starts_with(url, "ssh+git://") /* deprecated - do not use */
 949                ) {
 950                /*
 951                 * These are builtin smart transports; "allowed" transports
 952                 * will be checked individually in git_connect.
 953                 */
 954                struct git_transport_data *data = xcalloc(1, sizeof(*data));
 955                ret->data = data;
 956                ret->vtable = &builtin_smart_vtable;
 957                ret->smart_options = &(data->options);
 958
 959                data->conn = NULL;
 960                data->got_remote_heads = 0;
 961        } else {
 962                /* Unknown protocol in URL. Pass to external handler. */
 963                int len = external_specification_len(url);
 964                char *handler = xmemdupz(url, len);
 965                transport_helper_init(ret, handler);
 966        }
 967
 968        if (ret->smart_options) {
 969                ret->smart_options->thin = 1;
 970                ret->smart_options->uploadpack = "git-upload-pack";
 971                if (remote->uploadpack)
 972                        ret->smart_options->uploadpack = remote->uploadpack;
 973                ret->smart_options->receivepack = "git-receive-pack";
 974                if (remote->receivepack)
 975                        ret->smart_options->receivepack = remote->receivepack;
 976        }
 977
 978        return ret;
 979}
 980
 981int transport_set_option(struct transport *transport,
 982                         const char *name, const char *value)
 983{
 984        int git_reports = 1, protocol_reports = 1;
 985
 986        if (transport->smart_options)
 987                git_reports = set_git_option(transport->smart_options,
 988                                             name, value);
 989
 990        if (transport->vtable->set_option)
 991                protocol_reports = transport->vtable->set_option(transport,
 992                                                                 name, value);
 993
 994        /* If either report is 0, report 0 (success). */
 995        if (!git_reports || !protocol_reports)
 996                return 0;
 997        /* If either reports -1 (invalid value), report -1. */
 998        if ((git_reports == -1) || (protocol_reports == -1))
 999                return -1;
1000        /* Otherwise if both report unknown, report unknown. */
1001        return 1;
1002}
1003
1004void transport_set_verbosity(struct transport *transport, int verbosity,
1005        int force_progress)
1006{
1007        if (verbosity >= 1)
1008                transport->verbose = verbosity <= 3 ? verbosity : 3;
1009        if (verbosity < 0)
1010                transport->verbose = -1;
1011
1012        /**
1013         * Rules used to determine whether to report progress (processing aborts
1014         * when a rule is satisfied):
1015         *
1016         *   . Report progress, if force_progress is 1 (ie. --progress).
1017         *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
1018         *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
1019         *   . Report progress if isatty(2) is 1.
1020         **/
1021        if (force_progress >= 0)
1022                transport->progress = !!force_progress;
1023        else
1024                transport->progress = verbosity >= 0 && isatty(2);
1025}
1026
1027static void die_with_unpushed_submodules(struct string_list *needs_pushing)
1028{
1029        int i;
1030
1031        fprintf(stderr, _("The following submodule paths contain changes that can\n"
1032                        "not be found on any remote:\n"));
1033        for (i = 0; i < needs_pushing->nr; i++)
1034                fprintf(stderr, "  %s\n", needs_pushing->items[i].string);
1035        fprintf(stderr, _("\nPlease try\n\n"
1036                          "     git push --recurse-submodules=on-demand\n\n"
1037                          "or cd to the path and use\n\n"
1038                          "     git push\n\n"
1039                          "to push them to a remote.\n\n"));
1040
1041        string_list_clear(needs_pushing, 0);
1042
1043        die(_("Aborting."));
1044}
1045
1046static int run_pre_push_hook(struct transport *transport,
1047                             struct ref *remote_refs)
1048{
1049        int ret = 0, x;
1050        struct ref *r;
1051        struct child_process proc = CHILD_PROCESS_INIT;
1052        struct strbuf buf;
1053        const char *argv[4];
1054
1055        if (!(argv[0] = find_hook("pre-push")))
1056                return 0;
1057
1058        argv[1] = transport->remote->name;
1059        argv[2] = transport->url;
1060        argv[3] = NULL;
1061
1062        proc.argv = argv;
1063        proc.in = -1;
1064
1065        if (start_command(&proc)) {
1066                finish_command(&proc);
1067                return -1;
1068        }
1069
1070        sigchain_push(SIGPIPE, SIG_IGN);
1071
1072        strbuf_init(&buf, 256);
1073
1074        for (r = remote_refs; r; r = r->next) {
1075                if (!r->peer_ref) continue;
1076                if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
1077                if (r->status == REF_STATUS_REJECT_STALE) continue;
1078                if (r->status == REF_STATUS_UPTODATE) continue;
1079
1080                strbuf_reset(&buf);
1081                strbuf_addf( &buf, "%s %s %s %s\n",
1082                         r->peer_ref->name, oid_to_hex(&r->new_oid),
1083                         r->name, oid_to_hex(&r->old_oid));
1084
1085                if (write_in_full(proc.in, buf.buf, buf.len) < 0) {
1086                        /* We do not mind if a hook does not read all refs. */
1087                        if (errno != EPIPE)
1088                                ret = -1;
1089                        break;
1090                }
1091        }
1092
1093        strbuf_release(&buf);
1094
1095        x = close(proc.in);
1096        if (!ret)
1097                ret = x;
1098
1099        sigchain_pop(SIGPIPE);
1100
1101        x = finish_command(&proc);
1102        if (!ret)
1103                ret = x;
1104
1105        return ret;
1106}
1107
1108int transport_push(struct repository *r,
1109                   struct transport *transport,
1110                   struct refspec *rs, int flags,
1111                   unsigned int *reject_reasons)
1112{
1113        *reject_reasons = 0;
1114
1115        if (transport_color_config() < 0)
1116                return -1;
1117
1118        if (transport->vtable->push_refs) {
1119                struct ref *remote_refs;
1120                struct ref *local_refs = get_local_heads();
1121                int match_flags = MATCH_REFS_NONE;
1122                int verbose = (transport->verbose > 0);
1123                int quiet = (transport->verbose < 0);
1124                int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
1125                int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
1126                int push_ret, ret, err;
1127                struct argv_array ref_prefixes = ARGV_ARRAY_INIT;
1128
1129                if (check_push_refs(local_refs, rs) < 0)
1130                        return -1;
1131
1132                refspec_ref_prefixes(rs, &ref_prefixes);
1133
1134                remote_refs = transport->vtable->get_refs_list(transport, 1,
1135                                                               &ref_prefixes);
1136
1137                argv_array_clear(&ref_prefixes);
1138
1139                if (flags & TRANSPORT_PUSH_ALL)
1140                        match_flags |= MATCH_REFS_ALL;
1141                if (flags & TRANSPORT_PUSH_MIRROR)
1142                        match_flags |= MATCH_REFS_MIRROR;
1143                if (flags & TRANSPORT_PUSH_PRUNE)
1144                        match_flags |= MATCH_REFS_PRUNE;
1145                if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
1146                        match_flags |= MATCH_REFS_FOLLOW_TAGS;
1147
1148                if (match_push_refs(local_refs, &remote_refs, rs, match_flags))
1149                        return -1;
1150
1151                if (transport->smart_options &&
1152                    transport->smart_options->cas &&
1153                    !is_empty_cas(transport->smart_options->cas))
1154                        apply_push_cas(transport->smart_options->cas,
1155                                       transport->remote, remote_refs);
1156
1157                set_ref_status_for_push(remote_refs,
1158                        flags & TRANSPORT_PUSH_MIRROR,
1159                        flags & TRANSPORT_PUSH_FORCE);
1160
1161                if (!(flags & TRANSPORT_PUSH_NO_HOOK))
1162                        if (run_pre_push_hook(transport, remote_refs))
1163                                return -1;
1164
1165                if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1166                              TRANSPORT_RECURSE_SUBMODULES_ONLY)) &&
1167                    !is_bare_repository()) {
1168                        struct ref *ref = remote_refs;
1169                        struct oid_array commits = OID_ARRAY_INIT;
1170
1171                        for (; ref; ref = ref->next)
1172                                if (!is_null_oid(&ref->new_oid))
1173                                        oid_array_append(&commits,
1174                                                          &ref->new_oid);
1175
1176                        if (!push_unpushed_submodules(r,
1177                                                      &commits,
1178                                                      transport->remote,
1179                                                      rs,
1180                                                      transport->push_options,
1181                                                      pretend)) {
1182                                oid_array_clear(&commits);
1183                                die(_("failed to push all needed submodules"));
1184                        }
1185                        oid_array_clear(&commits);
1186                }
1187
1188                if (((flags & TRANSPORT_RECURSE_SUBMODULES_CHECK) ||
1189                     ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1190                                TRANSPORT_RECURSE_SUBMODULES_ONLY)) &&
1191                      !pretend)) && !is_bare_repository()) {
1192                        struct ref *ref = remote_refs;
1193                        struct string_list needs_pushing = STRING_LIST_INIT_DUP;
1194                        struct oid_array commits = OID_ARRAY_INIT;
1195
1196                        for (; ref; ref = ref->next)
1197                                if (!is_null_oid(&ref->new_oid))
1198                                        oid_array_append(&commits,
1199                                                          &ref->new_oid);
1200
1201                        if (find_unpushed_submodules(r,
1202                                                     &commits,
1203                                                     transport->remote->name,
1204                                                     &needs_pushing)) {
1205                                oid_array_clear(&commits);
1206                                die_with_unpushed_submodules(&needs_pushing);
1207                        }
1208                        string_list_clear(&needs_pushing, 0);
1209                        oid_array_clear(&commits);
1210                }
1211
1212                if (!(flags & TRANSPORT_RECURSE_SUBMODULES_ONLY))
1213                        push_ret = transport->vtable->push_refs(transport, remote_refs, flags);
1214                else
1215                        push_ret = 0;
1216                err = push_had_errors(remote_refs);
1217                ret = push_ret | err;
1218
1219                if (!quiet || err)
1220                        transport_print_push_status(transport->url, remote_refs,
1221                                        verbose | porcelain, porcelain,
1222                                        reject_reasons);
1223
1224                if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1225                        set_upstreams(transport, remote_refs, pretend);
1226
1227                if (!(flags & (TRANSPORT_PUSH_DRY_RUN |
1228                               TRANSPORT_RECURSE_SUBMODULES_ONLY))) {
1229                        struct ref *ref;
1230                        for (ref = remote_refs; ref; ref = ref->next)
1231                                transport_update_tracking_ref(transport->remote, ref, verbose);
1232                }
1233
1234                if (porcelain && !push_ret)
1235                        puts("Done");
1236                else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
1237                        fprintf(stderr, "Everything up-to-date\n");
1238
1239                return ret;
1240        }
1241        return 1;
1242}
1243
1244const struct ref *transport_get_remote_refs(struct transport *transport,
1245                                            const struct argv_array *ref_prefixes)
1246{
1247        if (!transport->got_remote_refs) {
1248                transport->remote_refs =
1249                        transport->vtable->get_refs_list(transport, 0,
1250                                                         ref_prefixes);
1251                transport->got_remote_refs = 1;
1252        }
1253
1254        return transport->remote_refs;
1255}
1256
1257int transport_fetch_refs(struct transport *transport, struct ref *refs)
1258{
1259        int rc;
1260        int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1261        struct ref **heads = NULL;
1262        struct ref *rm;
1263
1264        if (!transport->vtable->fetch_without_list)
1265                /*
1266                 * Some transports (e.g. the built-in bundle transport and the
1267                 * transport helper interface) do not work when fetching is
1268                 * done immediately after transport creation. List the remote
1269                 * refs anyway (if not already listed) as a workaround.
1270                 */
1271                transport_get_remote_refs(transport, NULL);
1272
1273        for (rm = refs; rm; rm = rm->next) {
1274                nr_refs++;
1275                if (rm->peer_ref &&
1276                    !is_null_oid(&rm->old_oid) &&
1277                    oideq(&rm->peer_ref->old_oid, &rm->old_oid))
1278                        continue;
1279                ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1280                heads[nr_heads++] = rm;
1281        }
1282
1283        if (!nr_heads) {
1284                /*
1285                 * When deepening of a shallow repository is requested,
1286                 * then local and remote refs are likely to still be equal.
1287                 * Just feed them all to the fetch method in that case.
1288                 * This condition shouldn't be met in a non-deepening fetch
1289                 * (see builtin/fetch.c:quickfetch()).
1290                 */
1291                ALLOC_ARRAY(heads, nr_refs);
1292                for (rm = refs; rm; rm = rm->next)
1293                        heads[nr_heads++] = rm;
1294        }
1295
1296        rc = transport->vtable->fetch(transport, nr_heads, heads);
1297
1298        free(heads);
1299        return rc;
1300}
1301
1302void transport_unlock_pack(struct transport *transport)
1303{
1304        if (transport->pack_lockfile) {
1305                unlink_or_warn(transport->pack_lockfile);
1306                FREE_AND_NULL(transport->pack_lockfile);
1307        }
1308}
1309
1310int transport_connect(struct transport *transport, const char *name,
1311                      const char *exec, int fd[2])
1312{
1313        if (transport->vtable->connect)
1314                return transport->vtable->connect(transport, name, exec, fd);
1315        else
1316                die(_("operation not supported by protocol"));
1317}
1318
1319int transport_disconnect(struct transport *transport)
1320{
1321        int ret = 0;
1322        if (transport->vtable->disconnect)
1323                ret = transport->vtable->disconnect(transport);
1324        free(transport);
1325        return ret;
1326}
1327
1328/*
1329 * Strip username (and password) from a URL and return
1330 * it in a newly allocated string.
1331 */
1332char *transport_anonymize_url(const char *url)
1333{
1334        char *scheme_prefix, *anon_part;
1335        size_t anon_len, prefix_len = 0;
1336
1337        anon_part = strchr(url, '@');
1338        if (url_is_local_not_ssh(url) || !anon_part)
1339                goto literal_copy;
1340
1341        anon_len = strlen(++anon_part);
1342        scheme_prefix = strstr(url, "://");
1343        if (!scheme_prefix) {
1344                if (!strchr(anon_part, ':'))
1345                        /* cannot be "me@there:/path/name" */
1346                        goto literal_copy;
1347        } else {
1348                const char *cp;
1349                /* make sure scheme is reasonable */
1350                for (cp = url; cp < scheme_prefix; cp++) {
1351                        switch (*cp) {
1352                                /* RFC 1738 2.1 */
1353                        case '+': case '.': case '-':
1354                                break; /* ok */
1355                        default:
1356                                if (isalnum(*cp))
1357                                        break;
1358                                /* it isn't */
1359                                goto literal_copy;
1360                        }
1361                }
1362                /* @ past the first slash does not count */
1363                cp = strchr(scheme_prefix + 3, '/');
1364                if (cp && cp < anon_part)
1365                        goto literal_copy;
1366                prefix_len = scheme_prefix - url + 3;
1367        }
1368        return xstrfmt("%.*s%.*s", (int)prefix_len, url,
1369                       (int)anon_len, anon_part);
1370literal_copy:
1371        return xstrdup(url);
1372}
1373
1374static void fill_alternate_refs_command(struct child_process *cmd,
1375                                        const char *repo_path)
1376{
1377        const char *value;
1378
1379        if (!git_config_get_value("core.alternateRefsCommand", &value)) {
1380                cmd->use_shell = 1;
1381
1382                argv_array_push(&cmd->args, value);
1383                argv_array_push(&cmd->args, repo_path);
1384        } else {
1385                cmd->git_cmd = 1;
1386
1387                argv_array_pushf(&cmd->args, "--git-dir=%s", repo_path);
1388                argv_array_push(&cmd->args, "for-each-ref");
1389                argv_array_push(&cmd->args, "--format=%(objectname)");
1390
1391                if (!git_config_get_value("core.alternateRefsPrefixes", &value)) {
1392                        argv_array_push(&cmd->args, "--");
1393                        argv_array_split(&cmd->args, value);
1394                }
1395        }
1396
1397        cmd->env = local_repo_env;
1398        cmd->out = -1;
1399}
1400
1401static void read_alternate_refs(const char *path,
1402                                alternate_ref_fn *cb,
1403                                void *data)
1404{
1405        struct child_process cmd = CHILD_PROCESS_INIT;
1406        struct strbuf line = STRBUF_INIT;
1407        FILE *fh;
1408
1409        fill_alternate_refs_command(&cmd, path);
1410
1411        if (start_command(&cmd))
1412                return;
1413
1414        fh = xfdopen(cmd.out, "r");
1415        while (strbuf_getline_lf(&line, fh) != EOF) {
1416                struct object_id oid;
1417                const char *p;
1418
1419                if (parse_oid_hex(line.buf, &oid, &p) || *p) {
1420                        warning(_("invalid line while parsing alternate refs: %s"),
1421                                line.buf);
1422                        break;
1423                }
1424
1425                cb(&oid, data);
1426        }
1427
1428        fclose(fh);
1429        finish_command(&cmd);
1430}
1431
1432struct alternate_refs_data {
1433        alternate_ref_fn *fn;
1434        void *data;
1435};
1436
1437static int refs_from_alternate_cb(struct object_directory *e,
1438                                  void *data)
1439{
1440        struct strbuf path = STRBUF_INIT;
1441        size_t base_len;
1442        struct alternate_refs_data *cb = data;
1443
1444        if (!strbuf_realpath(&path, e->path, 0))
1445                goto out;
1446        if (!strbuf_strip_suffix(&path, "/objects"))
1447                goto out;
1448        base_len = path.len;
1449
1450        /* Is this a git repository with refs? */
1451        strbuf_addstr(&path, "/refs");
1452        if (!is_directory(path.buf))
1453                goto out;
1454        strbuf_setlen(&path, base_len);
1455
1456        read_alternate_refs(path.buf, cb->fn, cb->data);
1457
1458out:
1459        strbuf_release(&path);
1460        return 0;
1461}
1462
1463void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1464{
1465        struct alternate_refs_data cb;
1466        cb.fn = fn;
1467        cb.data = data;
1468        foreach_alt_odb(refs_from_alternate_cb, &cb);
1469}