Andrew's git / gitweb.git / transport.c
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transport.con commit submodule--helper: convert push_check to use struct refspec (9c8361b)
   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(&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
 255static struct ref *get_refs_via_connect(struct transport *transport, int for_push,
 256                                        const struct argv_array *ref_prefixes)
 257{
 258        struct git_transport_data *data = transport->data;
 259        struct ref *refs = NULL;
 260        struct packet_reader reader;
 261
 262        connect_setup(transport, for_push);
 263
 264        packet_reader_init(&reader, data->fd[0], NULL, 0,
 265                           PACKET_READ_CHOMP_NEWLINE |
 266                           PACKET_READ_GENTLE_ON_EOF);
 267
 268        data->version = discover_version(&reader);
 269        switch (data->version) {
 270        case protocol_v2:
 271                get_remote_refs(data->fd[1], &reader, &refs, for_push,
 272                                ref_prefixes);
 273                break;
 274        case protocol_v1:
 275        case protocol_v0:
 276                get_remote_heads(&reader, &refs,
 277                                 for_push ? REF_NORMAL : 0,
 278                                 &data->extra_have,
 279                                 &data->shallow);
 280                break;
 281        case protocol_unknown_version:
 282                BUG("unknown protocol version");
 283        }
 284        data->got_remote_heads = 1;
 285
 286        return refs;
 287}
 288
 289static int fetch_refs_via_pack(struct transport *transport,
 290                               int nr_heads, struct ref **to_fetch)
 291{
 292        int ret = 0;
 293        struct git_transport_data *data = transport->data;
 294        struct ref *refs = NULL;
 295        char *dest = xstrdup(transport->url);
 296        struct fetch_pack_args args;
 297        struct ref *refs_tmp = NULL;
 298
 299        memset(&args, 0, sizeof(args));
 300        args.uploadpack = data->options.uploadpack;
 301        args.keep_pack = data->options.keep;
 302        args.lock_pack = 1;
 303        args.use_thin_pack = data->options.thin;
 304        args.include_tag = data->options.followtags;
 305        args.verbose = (transport->verbose > 1);
 306        args.quiet = (transport->verbose < 0);
 307        args.no_progress = !transport->progress;
 308        args.depth = data->options.depth;
 309        args.deepen_since = data->options.deepen_since;
 310        args.deepen_not = data->options.deepen_not;
 311        args.deepen_relative = data->options.deepen_relative;
 312        args.check_self_contained_and_connected =
 313                data->options.check_self_contained_and_connected;
 314        args.cloning = transport->cloning;
 315        args.update_shallow = data->options.update_shallow;
 316        args.from_promisor = data->options.from_promisor;
 317        args.no_dependents = data->options.no_dependents;
 318        args.filter_options = data->options.filter_options;
 319        args.stateless_rpc = transport->stateless_rpc;
 320
 321        if (!data->got_remote_heads)
 322                refs_tmp = get_refs_via_connect(transport, 0, NULL);
 323
 324        switch (data->version) {
 325        case protocol_v2:
 326                refs = fetch_pack(&args, data->fd, data->conn,
 327                                  refs_tmp ? refs_tmp : transport->remote_refs,
 328                                  dest, to_fetch, nr_heads, &data->shallow,
 329                                  &transport->pack_lockfile, data->version);
 330                break;
 331        case protocol_v1:
 332        case protocol_v0:
 333                refs = fetch_pack(&args, data->fd, data->conn,
 334                                  refs_tmp ? refs_tmp : transport->remote_refs,
 335                                  dest, to_fetch, nr_heads, &data->shallow,
 336                                  &transport->pack_lockfile, data->version);
 337                break;
 338        case protocol_unknown_version:
 339                BUG("unknown protocol version");
 340        }
 341
 342        close(data->fd[0]);
 343        close(data->fd[1]);
 344        if (finish_connect(data->conn))
 345                ret = -1;
 346        data->conn = NULL;
 347        data->got_remote_heads = 0;
 348        data->options.self_contained_and_connected =
 349                args.self_contained_and_connected;
 350
 351        if (refs == NULL)
 352                ret = -1;
 353        if (report_unmatched_refs(to_fetch, nr_heads))
 354                ret = -1;
 355
 356        free_refs(refs_tmp);
 357        free_refs(refs);
 358        free(dest);
 359        return ret;
 360}
 361
 362static int push_had_errors(struct ref *ref)
 363{
 364        for (; ref; ref = ref->next) {
 365                switch (ref->status) {
 366                case REF_STATUS_NONE:
 367                case REF_STATUS_UPTODATE:
 368                case REF_STATUS_OK:
 369                        break;
 370                default:
 371                        return 1;
 372                }
 373        }
 374        return 0;
 375}
 376
 377int transport_refs_pushed(struct ref *ref)
 378{
 379        for (; ref; ref = ref->next) {
 380                switch(ref->status) {
 381                case REF_STATUS_NONE:
 382                case REF_STATUS_UPTODATE:
 383                        break;
 384                default:
 385                        return 1;
 386                }
 387        }
 388        return 0;
 389}
 390
 391void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 392{
 393        struct refspec_item rs;
 394
 395        if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 396                return;
 397
 398        rs.src = ref->name;
 399        rs.dst = NULL;
 400
 401        if (!remote_find_tracking(remote, &rs)) {
 402                if (verbose)
 403                        fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 404                if (ref->deletion) {
 405                        delete_ref(NULL, rs.dst, NULL, 0);
 406                } else
 407                        update_ref("update by push", rs.dst, &ref->new_oid,
 408                                   NULL, 0, 0);
 409                free(rs.dst);
 410        }
 411}
 412
 413static void print_ref_status(char flag, const char *summary,
 414                             struct ref *to, struct ref *from, const char *msg,
 415                             int porcelain, int summary_width)
 416{
 417        if (porcelain) {
 418                if (from)
 419                        fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 420                else
 421                        fprintf(stdout, "%c\t:%s\t", flag, to->name);
 422                if (msg)
 423                        fprintf(stdout, "%s (%s)\n", summary, msg);
 424                else
 425                        fprintf(stdout, "%s\n", summary);
 426        } else {
 427                const char *red = "", *reset = "";
 428                if (push_had_errors(to)) {
 429                        red = transport_get_color(TRANSPORT_COLOR_REJECTED);
 430                        reset = transport_get_color(TRANSPORT_COLOR_RESET);
 431                }
 432                fprintf(stderr, " %s%c %-*s%s ", red, flag, summary_width,
 433                        summary, reset);
 434                if (from)
 435                        fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 436                else
 437                        fputs(prettify_refname(to->name), stderr);
 438                if (msg) {
 439                        fputs(" (", stderr);
 440                        fputs(msg, stderr);
 441                        fputc(')', stderr);
 442                }
 443                fputc('\n', stderr);
 444        }
 445}
 446
 447static void print_ok_ref_status(struct ref *ref, int porcelain, int summary_width)
 448{
 449        if (ref->deletion)
 450                print_ref_status('-', "[deleted]", ref, NULL, NULL,
 451                                 porcelain, summary_width);
 452        else if (is_null_oid(&ref->old_oid))
 453                print_ref_status('*',
 454                        (starts_with(ref->name, "refs/tags/") ? "[new tag]" :
 455                        "[new branch]"),
 456                        ref, ref->peer_ref, NULL, porcelain, summary_width);
 457        else {
 458                struct strbuf quickref = STRBUF_INIT;
 459                char type;
 460                const char *msg;
 461
 462                strbuf_add_unique_abbrev(&quickref, &ref->old_oid,
 463                                         DEFAULT_ABBREV);
 464                if (ref->forced_update) {
 465                        strbuf_addstr(&quickref, "...");
 466                        type = '+';
 467                        msg = "forced update";
 468                } else {
 469                        strbuf_addstr(&quickref, "..");
 470                        type = ' ';
 471                        msg = NULL;
 472                }
 473                strbuf_add_unique_abbrev(&quickref, &ref->new_oid,
 474                                         DEFAULT_ABBREV);
 475
 476                print_ref_status(type, quickref.buf, ref, ref->peer_ref, msg,
 477                                 porcelain, summary_width);
 478                strbuf_release(&quickref);
 479        }
 480}
 481
 482static int print_one_push_status(struct ref *ref, const char *dest, int count,
 483                                 int porcelain, int summary_width)
 484{
 485        if (!count) {
 486                char *url = transport_anonymize_url(dest);
 487                fprintf(porcelain ? stdout : stderr, "To %s\n", url);
 488                free(url);
 489        }
 490
 491        switch(ref->status) {
 492        case REF_STATUS_NONE:
 493                print_ref_status('X', "[no match]", ref, NULL, NULL,
 494                                 porcelain, summary_width);
 495                break;
 496        case REF_STATUS_REJECT_NODELETE:
 497                print_ref_status('!', "[rejected]", ref, NULL,
 498                                 "remote does not support deleting refs",
 499                                 porcelain, summary_width);
 500                break;
 501        case REF_STATUS_UPTODATE:
 502                print_ref_status('=', "[up to date]", ref,
 503                                 ref->peer_ref, NULL, porcelain, summary_width);
 504                break;
 505        case REF_STATUS_REJECT_NONFASTFORWARD:
 506                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 507                                 "non-fast-forward", porcelain, summary_width);
 508                break;
 509        case REF_STATUS_REJECT_ALREADY_EXISTS:
 510                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 511                                 "already exists", porcelain, summary_width);
 512                break;
 513        case REF_STATUS_REJECT_FETCH_FIRST:
 514                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 515                                 "fetch first", porcelain, summary_width);
 516                break;
 517        case REF_STATUS_REJECT_NEEDS_FORCE:
 518                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 519                                 "needs force", porcelain, summary_width);
 520                break;
 521        case REF_STATUS_REJECT_STALE:
 522                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 523                                 "stale info", porcelain, summary_width);
 524                break;
 525        case REF_STATUS_REJECT_SHALLOW:
 526                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 527                                 "new shallow roots not allowed",
 528                                 porcelain, summary_width);
 529                break;
 530        case REF_STATUS_REMOTE_REJECT:
 531                print_ref_status('!', "[remote rejected]", ref,
 532                                 ref->deletion ? NULL : ref->peer_ref,
 533                                 ref->remote_status, porcelain, summary_width);
 534                break;
 535        case REF_STATUS_EXPECTING_REPORT:
 536                print_ref_status('!', "[remote failure]", ref,
 537                                 ref->deletion ? NULL : ref->peer_ref,
 538                                 "remote failed to report status",
 539                                 porcelain, summary_width);
 540                break;
 541        case REF_STATUS_ATOMIC_PUSH_FAILED:
 542                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 543                                 "atomic push failed", porcelain, summary_width);
 544                break;
 545        case REF_STATUS_OK:
 546                print_ok_ref_status(ref, porcelain, summary_width);
 547                break;
 548        }
 549
 550        return 1;
 551}
 552
 553static int measure_abbrev(const struct object_id *oid, int sofar)
 554{
 555        char hex[GIT_MAX_HEXSZ + 1];
 556        int w = find_unique_abbrev_r(hex, oid, DEFAULT_ABBREV);
 557
 558        return (w < sofar) ? sofar : w;
 559}
 560
 561int transport_summary_width(const struct ref *refs)
 562{
 563        int maxw = -1;
 564
 565        for (; refs; refs = refs->next) {
 566                maxw = measure_abbrev(&refs->old_oid, maxw);
 567                maxw = measure_abbrev(&refs->new_oid, maxw);
 568        }
 569        if (maxw < 0)
 570                maxw = FALLBACK_DEFAULT_ABBREV;
 571        return (2 * maxw + 3);
 572}
 573
 574void transport_print_push_status(const char *dest, struct ref *refs,
 575                                  int verbose, int porcelain, unsigned int *reject_reasons)
 576{
 577        struct ref *ref;
 578        int n = 0;
 579        char *head;
 580        int summary_width = transport_summary_width(refs);
 581
 582        if (transport_color_config() < 0)
 583                warning(_("could not parse transport.color.* config"));
 584
 585        head = resolve_refdup("HEAD", RESOLVE_REF_READING, NULL, NULL);
 586
 587        if (verbose) {
 588                for (ref = refs; ref; ref = ref->next)
 589                        if (ref->status == REF_STATUS_UPTODATE)
 590                                n += print_one_push_status(ref, dest, n,
 591                                                           porcelain, summary_width);
 592        }
 593
 594        for (ref = refs; ref; ref = ref->next)
 595                if (ref->status == REF_STATUS_OK)
 596                        n += print_one_push_status(ref, dest, n,
 597                                                   porcelain, summary_width);
 598
 599        *reject_reasons = 0;
 600        for (ref = refs; ref; ref = ref->next) {
 601                if (ref->status != REF_STATUS_NONE &&
 602                    ref->status != REF_STATUS_UPTODATE &&
 603                    ref->status != REF_STATUS_OK)
 604                        n += print_one_push_status(ref, dest, n,
 605                                                   porcelain, summary_width);
 606                if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
 607                        if (head != NULL && !strcmp(head, ref->name))
 608                                *reject_reasons |= REJECT_NON_FF_HEAD;
 609                        else
 610                                *reject_reasons |= REJECT_NON_FF_OTHER;
 611                } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
 612                        *reject_reasons |= REJECT_ALREADY_EXISTS;
 613                } else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
 614                        *reject_reasons |= REJECT_FETCH_FIRST;
 615                } else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
 616                        *reject_reasons |= REJECT_NEEDS_FORCE;
 617                }
 618        }
 619        free(head);
 620}
 621
 622void transport_verify_remote_names(int nr_heads, const char **heads)
 623{
 624        int i;
 625
 626        for (i = 0; i < nr_heads; i++) {
 627                const char *local = heads[i];
 628                const char *remote = strrchr(heads[i], ':');
 629
 630                if (*local == '+')
 631                        local++;
 632
 633                /* A matching refspec is okay.  */
 634                if (remote == local && remote[1] == '\0')
 635                        continue;
 636
 637                remote = remote ? (remote + 1) : local;
 638                if (check_refname_format(remote,
 639                                REFNAME_ALLOW_ONELEVEL|REFNAME_REFSPEC_PATTERN))
 640                        die("remote part of refspec is not a valid name in %s",
 641                                heads[i]);
 642        }
 643}
 644
 645static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 646{
 647        struct git_transport_data *data = transport->data;
 648        struct send_pack_args args;
 649        int ret = 0;
 650
 651        if (transport_color_config() < 0)
 652                return -1;
 653
 654        if (!data->got_remote_heads)
 655                get_refs_via_connect(transport, 1, NULL);
 656
 657        memset(&args, 0, sizeof(args));
 658        args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 659        args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 660        args.use_thin_pack = data->options.thin;
 661        args.verbose = (transport->verbose > 0);
 662        args.quiet = (transport->verbose < 0);
 663        args.progress = transport->progress;
 664        args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 665        args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
 666        args.atomic = !!(flags & TRANSPORT_PUSH_ATOMIC);
 667        args.push_options = transport->push_options;
 668        args.url = transport->url;
 669
 670        if (flags & TRANSPORT_PUSH_CERT_ALWAYS)
 671                args.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 672        else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED)
 673                args.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 674        else
 675                args.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 676
 677        switch (data->version) {
 678        case protocol_v2:
 679                die("support for protocol v2 not implemented yet");
 680                break;
 681        case protocol_v1:
 682        case protocol_v0:
 683                ret = send_pack(&args, data->fd, data->conn, remote_refs,
 684                                &data->extra_have);
 685                break;
 686        case protocol_unknown_version:
 687                BUG("unknown protocol version");
 688        }
 689
 690        close(data->fd[1]);
 691        close(data->fd[0]);
 692        ret |= finish_connect(data->conn);
 693        data->conn = NULL;
 694        data->got_remote_heads = 0;
 695
 696        return ret;
 697}
 698
 699static int connect_git(struct transport *transport, const char *name,
 700                       const char *executable, int fd[2])
 701{
 702        struct git_transport_data *data = transport->data;
 703        data->conn = git_connect(data->fd, transport->url,
 704                                 executable, 0);
 705        fd[0] = data->fd[0];
 706        fd[1] = data->fd[1];
 707        return 0;
 708}
 709
 710static int disconnect_git(struct transport *transport)
 711{
 712        struct git_transport_data *data = transport->data;
 713        if (data->conn) {
 714                if (data->got_remote_heads)
 715                        packet_flush(data->fd[1]);
 716                close(data->fd[0]);
 717                close(data->fd[1]);
 718                finish_connect(data->conn);
 719        }
 720
 721        free(data);
 722        return 0;
 723}
 724
 725static struct transport_vtable taken_over_vtable = {
 726        NULL,
 727        get_refs_via_connect,
 728        fetch_refs_via_pack,
 729        git_transport_push,
 730        NULL,
 731        disconnect_git
 732};
 733
 734void transport_take_over(struct transport *transport,
 735                         struct child_process *child)
 736{
 737        struct git_transport_data *data;
 738
 739        if (!transport->smart_options)
 740                die("BUG: taking over transport requires non-NULL "
 741                    "smart_options field.");
 742
 743        data = xcalloc(1, sizeof(*data));
 744        data->options = *transport->smart_options;
 745        data->conn = child;
 746        data->fd[0] = data->conn->out;
 747        data->fd[1] = data->conn->in;
 748        data->got_remote_heads = 0;
 749        transport->data = data;
 750
 751        transport->vtable = &taken_over_vtable;
 752        transport->smart_options = &(data->options);
 753
 754        transport->cannot_reuse = 1;
 755}
 756
 757static int is_file(const char *url)
 758{
 759        struct stat buf;
 760        if (stat(url, &buf))
 761                return 0;
 762        return S_ISREG(buf.st_mode);
 763}
 764
 765static int external_specification_len(const char *url)
 766{
 767        return strchr(url, ':') - url;
 768}
 769
 770static const struct string_list *protocol_whitelist(void)
 771{
 772        static int enabled = -1;
 773        static struct string_list allowed = STRING_LIST_INIT_DUP;
 774
 775        if (enabled < 0) {
 776                const char *v = getenv("GIT_ALLOW_PROTOCOL");
 777                if (v) {
 778                        string_list_split(&allowed, v, ':', -1);
 779                        string_list_sort(&allowed);
 780                        enabled = 1;
 781                } else {
 782                        enabled = 0;
 783                }
 784        }
 785
 786        return enabled ? &allowed : NULL;
 787}
 788
 789enum protocol_allow_config {
 790        PROTOCOL_ALLOW_NEVER = 0,
 791        PROTOCOL_ALLOW_USER_ONLY,
 792        PROTOCOL_ALLOW_ALWAYS
 793};
 794
 795static enum protocol_allow_config parse_protocol_config(const char *key,
 796                                                        const char *value)
 797{
 798        if (!strcasecmp(value, "always"))
 799                return PROTOCOL_ALLOW_ALWAYS;
 800        else if (!strcasecmp(value, "never"))
 801                return PROTOCOL_ALLOW_NEVER;
 802        else if (!strcasecmp(value, "user"))
 803                return PROTOCOL_ALLOW_USER_ONLY;
 804
 805        die("unknown value for config '%s': %s", key, value);
 806}
 807
 808static enum protocol_allow_config get_protocol_config(const char *type)
 809{
 810        char *key = xstrfmt("protocol.%s.allow", type);
 811        char *value;
 812
 813        /* first check the per-protocol config */
 814        if (!git_config_get_string(key, &value)) {
 815                enum protocol_allow_config ret =
 816                        parse_protocol_config(key, value);
 817                free(key);
 818                free(value);
 819                return ret;
 820        }
 821        free(key);
 822
 823        /* if defined, fallback to user-defined default for unknown protocols */
 824        if (!git_config_get_string("protocol.allow", &value)) {
 825                enum protocol_allow_config ret =
 826                        parse_protocol_config("protocol.allow", value);
 827                free(value);
 828                return ret;
 829        }
 830
 831        /* fallback to built-in defaults */
 832        /* known safe */
 833        if (!strcmp(type, "http") ||
 834            !strcmp(type, "https") ||
 835            !strcmp(type, "git") ||
 836            !strcmp(type, "ssh") ||
 837            !strcmp(type, "file"))
 838                return PROTOCOL_ALLOW_ALWAYS;
 839
 840        /* known scary; err on the side of caution */
 841        if (!strcmp(type, "ext"))
 842                return PROTOCOL_ALLOW_NEVER;
 843
 844        /* unknown; by default let them be used only directly by the user */
 845        return PROTOCOL_ALLOW_USER_ONLY;
 846}
 847
 848int is_transport_allowed(const char *type, int from_user)
 849{
 850        const struct string_list *whitelist = protocol_whitelist();
 851        if (whitelist)
 852                return string_list_has_string(whitelist, type);
 853
 854        switch (get_protocol_config(type)) {
 855        case PROTOCOL_ALLOW_ALWAYS:
 856                return 1;
 857        case PROTOCOL_ALLOW_NEVER:
 858                return 0;
 859        case PROTOCOL_ALLOW_USER_ONLY:
 860                if (from_user < 0)
 861                        from_user = git_env_bool("GIT_PROTOCOL_FROM_USER", 1);
 862                return from_user;
 863        }
 864
 865        die("BUG: invalid protocol_allow_config type");
 866}
 867
 868void transport_check_allowed(const char *type)
 869{
 870        if (!is_transport_allowed(type, -1))
 871                die("transport '%s' not allowed", type);
 872}
 873
 874static struct transport_vtable bundle_vtable = {
 875        NULL,
 876        get_refs_from_bundle,
 877        fetch_refs_from_bundle,
 878        NULL,
 879        NULL,
 880        close_bundle
 881};
 882
 883static struct transport_vtable builtin_smart_vtable = {
 884        NULL,
 885        get_refs_via_connect,
 886        fetch_refs_via_pack,
 887        git_transport_push,
 888        connect_git,
 889        disconnect_git
 890};
 891
 892struct transport *transport_get(struct remote *remote, const char *url)
 893{
 894        const char *helper;
 895        struct transport *ret = xcalloc(1, sizeof(*ret));
 896
 897        ret->progress = isatty(2);
 898
 899        if (!remote)
 900                die("No remote provided to transport_get()");
 901
 902        ret->got_remote_refs = 0;
 903        ret->remote = remote;
 904        helper = remote->foreign_vcs;
 905
 906        if (!url && remote->url)
 907                url = remote->url[0];
 908        ret->url = url;
 909
 910        /* maybe it is a foreign URL? */
 911        if (url) {
 912                const char *p = url;
 913
 914                while (is_urlschemechar(p == url, *p))
 915                        p++;
 916                if (starts_with(p, "::"))
 917                        helper = xstrndup(url, p - url);
 918        }
 919
 920        if (helper) {
 921                transport_helper_init(ret, helper);
 922        } else if (starts_with(url, "rsync:")) {
 923                die("git-over-rsync is no longer supported");
 924        } else if (url_is_local_not_ssh(url) && is_file(url) && is_bundle(url, 1)) {
 925                struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 926                transport_check_allowed("file");
 927                ret->data = data;
 928                ret->vtable = &bundle_vtable;
 929                ret->smart_options = NULL;
 930        } else if (!is_url(url)
 931                || starts_with(url, "file://")
 932                || starts_with(url, "git://")
 933                || starts_with(url, "ssh://")
 934                || starts_with(url, "git+ssh://") /* deprecated - do not use */
 935                || starts_with(url, "ssh+git://") /* deprecated - do not use */
 936                ) {
 937                /*
 938                 * These are builtin smart transports; "allowed" transports
 939                 * will be checked individually in git_connect.
 940                 */
 941                struct git_transport_data *data = xcalloc(1, sizeof(*data));
 942                ret->data = data;
 943                ret->vtable = &builtin_smart_vtable;
 944                ret->smart_options = &(data->options);
 945
 946                data->conn = NULL;
 947                data->got_remote_heads = 0;
 948        } else {
 949                /* Unknown protocol in URL. Pass to external handler. */
 950                int len = external_specification_len(url);
 951                char *handler = xmemdupz(url, len);
 952                transport_helper_init(ret, handler);
 953        }
 954
 955        if (ret->smart_options) {
 956                ret->smart_options->thin = 1;
 957                ret->smart_options->uploadpack = "git-upload-pack";
 958                if (remote->uploadpack)
 959                        ret->smart_options->uploadpack = remote->uploadpack;
 960                ret->smart_options->receivepack = "git-receive-pack";
 961                if (remote->receivepack)
 962                        ret->smart_options->receivepack = remote->receivepack;
 963        }
 964
 965        return ret;
 966}
 967
 968int transport_set_option(struct transport *transport,
 969                         const char *name, const char *value)
 970{
 971        int git_reports = 1, protocol_reports = 1;
 972
 973        if (transport->smart_options)
 974                git_reports = set_git_option(transport->smart_options,
 975                                             name, value);
 976
 977        if (transport->vtable->set_option)
 978                protocol_reports = transport->vtable->set_option(transport,
 979                                                                 name, value);
 980
 981        /* If either report is 0, report 0 (success). */
 982        if (!git_reports || !protocol_reports)
 983                return 0;
 984        /* If either reports -1 (invalid value), report -1. */
 985        if ((git_reports == -1) || (protocol_reports == -1))
 986                return -1;
 987        /* Otherwise if both report unknown, report unknown. */
 988        return 1;
 989}
 990
 991void transport_set_verbosity(struct transport *transport, int verbosity,
 992        int force_progress)
 993{
 994        if (verbosity >= 1)
 995                transport->verbose = verbosity <= 3 ? verbosity : 3;
 996        if (verbosity < 0)
 997                transport->verbose = -1;
 998
 999        /**
1000         * Rules used to determine whether to report progress (processing aborts
1001         * when a rule is satisfied):
1002         *
1003         *   . Report progress, if force_progress is 1 (ie. --progress).
1004         *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
1005         *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
1006         *   . Report progress if isatty(2) is 1.
1007         **/
1008        if (force_progress >= 0)
1009                transport->progress = !!force_progress;
1010        else
1011                transport->progress = verbosity >= 0 && isatty(2);
1012}
1013
1014static void die_with_unpushed_submodules(struct string_list *needs_pushing)
1015{
1016        int i;
1017
1018        fprintf(stderr, _("The following submodule paths contain changes that can\n"
1019                        "not be found on any remote:\n"));
1020        for (i = 0; i < needs_pushing->nr; i++)
1021                fprintf(stderr, "  %s\n", needs_pushing->items[i].string);
1022        fprintf(stderr, _("\nPlease try\n\n"
1023                          "     git push --recurse-submodules=on-demand\n\n"
1024                          "or cd to the path and use\n\n"
1025                          "     git push\n\n"
1026                          "to push them to a remote.\n\n"));
1027
1028        string_list_clear(needs_pushing, 0);
1029
1030        die(_("Aborting."));
1031}
1032
1033static int run_pre_push_hook(struct transport *transport,
1034                             struct ref *remote_refs)
1035{
1036        int ret = 0, x;
1037        struct ref *r;
1038        struct child_process proc = CHILD_PROCESS_INIT;
1039        struct strbuf buf;
1040        const char *argv[4];
1041
1042        if (!(argv[0] = find_hook("pre-push")))
1043                return 0;
1044
1045        argv[1] = transport->remote->name;
1046        argv[2] = transport->url;
1047        argv[3] = NULL;
1048
1049        proc.argv = argv;
1050        proc.in = -1;
1051
1052        if (start_command(&proc)) {
1053                finish_command(&proc);
1054                return -1;
1055        }
1056
1057        sigchain_push(SIGPIPE, SIG_IGN);
1058
1059        strbuf_init(&buf, 256);
1060
1061        for (r = remote_refs; r; r = r->next) {
1062                if (!r->peer_ref) continue;
1063                if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
1064                if (r->status == REF_STATUS_REJECT_STALE) continue;
1065                if (r->status == REF_STATUS_UPTODATE) continue;
1066
1067                strbuf_reset(&buf);
1068                strbuf_addf( &buf, "%s %s %s %s\n",
1069                         r->peer_ref->name, oid_to_hex(&r->new_oid),
1070                         r->name, oid_to_hex(&r->old_oid));
1071
1072                if (write_in_full(proc.in, buf.buf, buf.len) < 0) {
1073                        /* We do not mind if a hook does not read all refs. */
1074                        if (errno != EPIPE)
1075                                ret = -1;
1076                        break;
1077                }
1078        }
1079
1080        strbuf_release(&buf);
1081
1082        x = close(proc.in);
1083        if (!ret)
1084                ret = x;
1085
1086        sigchain_pop(SIGPIPE);
1087
1088        x = finish_command(&proc);
1089        if (!ret)
1090                ret = x;
1091
1092        return ret;
1093}
1094
1095int transport_push(struct transport *transport,
1096                   int refspec_nr, const char **refspec, int flags,
1097                   unsigned int *reject_reasons)
1098{
1099        *reject_reasons = 0;
1100        transport_verify_remote_names(refspec_nr, refspec);
1101
1102        if (transport_color_config() < 0)
1103                return -1;
1104
1105        if (transport->vtable->push_refs) {
1106                struct ref *remote_refs;
1107                struct ref *local_refs = get_local_heads();
1108                int match_flags = MATCH_REFS_NONE;
1109                int verbose = (transport->verbose > 0);
1110                int quiet = (transport->verbose < 0);
1111                int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
1112                int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
1113                int push_ret, ret, err;
1114                struct refspec_item *tmp_rs;
1115                struct argv_array ref_prefixes = ARGV_ARRAY_INIT;
1116                int i;
1117
1118                if (check_push_refs(local_refs, refspec_nr, refspec) < 0)
1119                        return -1;
1120
1121                tmp_rs = parse_push_refspec(refspec_nr, refspec);
1122                for (i = 0; i < refspec_nr; i++) {
1123                        const char *prefix = NULL;
1124
1125                        if (tmp_rs[i].dst)
1126                                prefix = tmp_rs[i].dst;
1127                        else if (tmp_rs[i].src && !tmp_rs[i].exact_sha1)
1128                                prefix = tmp_rs[i].src;
1129
1130                        if (prefix) {
1131                                const char *glob = strchr(prefix, '*');
1132                                if (glob)
1133                                        argv_array_pushf(&ref_prefixes, "%.*s",
1134                                                         (int)(glob - prefix),
1135                                                         prefix);
1136                                else
1137                                        expand_ref_prefix(&ref_prefixes, prefix);
1138                        }
1139                }
1140
1141                remote_refs = transport->vtable->get_refs_list(transport, 1,
1142                                                               &ref_prefixes);
1143
1144                argv_array_clear(&ref_prefixes);
1145                free_refspec(refspec_nr, tmp_rs);
1146
1147                if (flags & TRANSPORT_PUSH_ALL)
1148                        match_flags |= MATCH_REFS_ALL;
1149                if (flags & TRANSPORT_PUSH_MIRROR)
1150                        match_flags |= MATCH_REFS_MIRROR;
1151                if (flags & TRANSPORT_PUSH_PRUNE)
1152                        match_flags |= MATCH_REFS_PRUNE;
1153                if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
1154                        match_flags |= MATCH_REFS_FOLLOW_TAGS;
1155
1156                if (match_push_refs(local_refs, &remote_refs,
1157                                    refspec_nr, refspec, match_flags)) {
1158                        return -1;
1159                }
1160
1161                if (transport->smart_options &&
1162                    transport->smart_options->cas &&
1163                    !is_empty_cas(transport->smart_options->cas))
1164                        apply_push_cas(transport->smart_options->cas,
1165                                       transport->remote, remote_refs);
1166
1167                set_ref_status_for_push(remote_refs,
1168                        flags & TRANSPORT_PUSH_MIRROR,
1169                        flags & TRANSPORT_PUSH_FORCE);
1170
1171                if (!(flags & TRANSPORT_PUSH_NO_HOOK))
1172                        if (run_pre_push_hook(transport, remote_refs))
1173                                return -1;
1174
1175                if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1176                              TRANSPORT_RECURSE_SUBMODULES_ONLY)) &&
1177                    !is_bare_repository()) {
1178                        struct ref *ref = remote_refs;
1179                        struct oid_array commits = OID_ARRAY_INIT;
1180
1181                        for (; ref; ref = ref->next)
1182                                if (!is_null_oid(&ref->new_oid))
1183                                        oid_array_append(&commits,
1184                                                          &ref->new_oid);
1185
1186                        if (!push_unpushed_submodules(&commits,
1187                                                      transport->remote,
1188                                                      refspec, refspec_nr,
1189                                                      transport->push_options,
1190                                                      pretend)) {
1191                                oid_array_clear(&commits);
1192                                die("Failed to push all needed submodules!");
1193                        }
1194                        oid_array_clear(&commits);
1195                }
1196
1197                if (((flags & TRANSPORT_RECURSE_SUBMODULES_CHECK) ||
1198                     ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1199                                TRANSPORT_RECURSE_SUBMODULES_ONLY)) &&
1200                      !pretend)) && !is_bare_repository()) {
1201                        struct ref *ref = remote_refs;
1202                        struct string_list needs_pushing = STRING_LIST_INIT_DUP;
1203                        struct oid_array commits = OID_ARRAY_INIT;
1204
1205                        for (; ref; ref = ref->next)
1206                                if (!is_null_oid(&ref->new_oid))
1207                                        oid_array_append(&commits,
1208                                                          &ref->new_oid);
1209
1210                        if (find_unpushed_submodules(&commits, transport->remote->name,
1211                                                &needs_pushing)) {
1212                                oid_array_clear(&commits);
1213                                die_with_unpushed_submodules(&needs_pushing);
1214                        }
1215                        string_list_clear(&needs_pushing, 0);
1216                        oid_array_clear(&commits);
1217                }
1218
1219                if (!(flags & TRANSPORT_RECURSE_SUBMODULES_ONLY))
1220                        push_ret = transport->vtable->push_refs(transport, remote_refs, flags);
1221                else
1222                        push_ret = 0;
1223                err = push_had_errors(remote_refs);
1224                ret = push_ret | err;
1225
1226                if (!quiet || err)
1227                        transport_print_push_status(transport->url, remote_refs,
1228                                        verbose | porcelain, porcelain,
1229                                        reject_reasons);
1230
1231                if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1232                        set_upstreams(transport, remote_refs, pretend);
1233
1234                if (!(flags & (TRANSPORT_PUSH_DRY_RUN |
1235                               TRANSPORT_RECURSE_SUBMODULES_ONLY))) {
1236                        struct ref *ref;
1237                        for (ref = remote_refs; ref; ref = ref->next)
1238                                transport_update_tracking_ref(transport->remote, ref, verbose);
1239                }
1240
1241                if (porcelain && !push_ret)
1242                        puts("Done");
1243                else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
1244                        fprintf(stderr, "Everything up-to-date\n");
1245
1246                return ret;
1247        }
1248        return 1;
1249}
1250
1251const struct ref *transport_get_remote_refs(struct transport *transport,
1252                                            const struct argv_array *ref_prefixes)
1253{
1254        if (!transport->got_remote_refs) {
1255                transport->remote_refs =
1256                        transport->vtable->get_refs_list(transport, 0,
1257                                                         ref_prefixes);
1258                transport->got_remote_refs = 1;
1259        }
1260
1261        return transport->remote_refs;
1262}
1263
1264int transport_fetch_refs(struct transport *transport, struct ref *refs)
1265{
1266        int rc;
1267        int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1268        struct ref **heads = NULL;
1269        struct ref *rm;
1270
1271        for (rm = refs; rm; rm = rm->next) {
1272                nr_refs++;
1273                if (rm->peer_ref &&
1274                    !is_null_oid(&rm->old_oid) &&
1275                    !oidcmp(&rm->peer_ref->old_oid, &rm->old_oid))
1276                        continue;
1277                ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1278                heads[nr_heads++] = rm;
1279        }
1280
1281        if (!nr_heads) {
1282                /*
1283                 * When deepening of a shallow repository is requested,
1284                 * then local and remote refs are likely to still be equal.
1285                 * Just feed them all to the fetch method in that case.
1286                 * This condition shouldn't be met in a non-deepening fetch
1287                 * (see builtin/fetch.c:quickfetch()).
1288                 */
1289                ALLOC_ARRAY(heads, nr_refs);
1290                for (rm = refs; rm; rm = rm->next)
1291                        heads[nr_heads++] = rm;
1292        }
1293
1294        rc = transport->vtable->fetch(transport, nr_heads, heads);
1295
1296        free(heads);
1297        return rc;
1298}
1299
1300void transport_unlock_pack(struct transport *transport)
1301{
1302        if (transport->pack_lockfile) {
1303                unlink_or_warn(transport->pack_lockfile);
1304                FREE_AND_NULL(transport->pack_lockfile);
1305        }
1306}
1307
1308int transport_connect(struct transport *transport, const char *name,
1309                      const char *exec, int fd[2])
1310{
1311        if (transport->vtable->connect)
1312                return transport->vtable->connect(transport, name, exec, fd);
1313        else
1314                die("Operation not supported by protocol");
1315}
1316
1317int transport_disconnect(struct transport *transport)
1318{
1319        int ret = 0;
1320        if (transport->vtable->disconnect)
1321                ret = transport->vtable->disconnect(transport);
1322        free(transport);
1323        return ret;
1324}
1325
1326/*
1327 * Strip username (and password) from a URL and return
1328 * it in a newly allocated string.
1329 */
1330char *transport_anonymize_url(const char *url)
1331{
1332        char *scheme_prefix, *anon_part;
1333        size_t anon_len, prefix_len = 0;
1334
1335        anon_part = strchr(url, '@');
1336        if (url_is_local_not_ssh(url) || !anon_part)
1337                goto literal_copy;
1338
1339        anon_len = strlen(++anon_part);
1340        scheme_prefix = strstr(url, "://");
1341        if (!scheme_prefix) {
1342                if (!strchr(anon_part, ':'))
1343                        /* cannot be "me@there:/path/name" */
1344                        goto literal_copy;
1345        } else {
1346                const char *cp;
1347                /* make sure scheme is reasonable */
1348                for (cp = url; cp < scheme_prefix; cp++) {
1349                        switch (*cp) {
1350                                /* RFC 1738 2.1 */
1351                        case '+': case '.': case '-':
1352                                break; /* ok */
1353                        default:
1354                                if (isalnum(*cp))
1355                                        break;
1356                                /* it isn't */
1357                                goto literal_copy;
1358                        }
1359                }
1360                /* @ past the first slash does not count */
1361                cp = strchr(scheme_prefix + 3, '/');
1362                if (cp && cp < anon_part)
1363                        goto literal_copy;
1364                prefix_len = scheme_prefix - url + 3;
1365        }
1366        return xstrfmt("%.*s%.*s", (int)prefix_len, url,
1367                       (int)anon_len, anon_part);
1368literal_copy:
1369        return xstrdup(url);
1370}
1371
1372static void read_alternate_refs(const char *path,
1373                                alternate_ref_fn *cb,
1374                                void *data)
1375{
1376        struct child_process cmd = CHILD_PROCESS_INIT;
1377        struct strbuf line = STRBUF_INIT;
1378        FILE *fh;
1379
1380        cmd.git_cmd = 1;
1381        argv_array_pushf(&cmd.args, "--git-dir=%s", path);
1382        argv_array_push(&cmd.args, "for-each-ref");
1383        argv_array_push(&cmd.args, "--format=%(objectname) %(refname)");
1384        cmd.env = local_repo_env;
1385        cmd.out = -1;
1386
1387        if (start_command(&cmd))
1388                return;
1389
1390        fh = xfdopen(cmd.out, "r");
1391        while (strbuf_getline_lf(&line, fh) != EOF) {
1392                struct object_id oid;
1393
1394                if (get_oid_hex(line.buf, &oid) ||
1395                    line.buf[GIT_SHA1_HEXSZ] != ' ') {
1396                        warning("invalid line while parsing alternate refs: %s",
1397                                line.buf);
1398                        break;
1399                }
1400
1401                cb(line.buf + GIT_SHA1_HEXSZ + 1, &oid, data);
1402        }
1403
1404        fclose(fh);
1405        finish_command(&cmd);
1406}
1407
1408struct alternate_refs_data {
1409        alternate_ref_fn *fn;
1410        void *data;
1411};
1412
1413static int refs_from_alternate_cb(struct alternate_object_database *e,
1414                                  void *data)
1415{
1416        struct strbuf path = STRBUF_INIT;
1417        size_t base_len;
1418        struct alternate_refs_data *cb = data;
1419
1420        if (!strbuf_realpath(&path, e->path, 0))
1421                goto out;
1422        if (!strbuf_strip_suffix(&path, "/objects"))
1423                goto out;
1424        base_len = path.len;
1425
1426        /* Is this a git repository with refs? */
1427        strbuf_addstr(&path, "/refs");
1428        if (!is_directory(path.buf))
1429                goto out;
1430        strbuf_setlen(&path, base_len);
1431
1432        read_alternate_refs(path.buf, cb->fn, cb->data);
1433
1434out:
1435        strbuf_release(&path);
1436        return 0;
1437}
1438
1439void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1440{
1441        struct alternate_refs_data cb;
1442        cb.fn = fn;
1443        cb.data = data;
1444        foreach_alt_odb(refs_from_alternate_cb, &cb);
1445}