Andrew's git / gitweb.git / transport.c
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transport.con commit Git/SVN: die when there is no commit metadata (523a33c)
   1#include "cache.h"
   2#include "transport.h"
   3#include "run-command.h"
   4#include "pkt-line.h"
   5#include "fetch-pack.h"
   6#include "remote.h"
   7#include "connect.h"
   8#include "send-pack.h"
   9#include "walker.h"
  10#include "bundle.h"
  11#include "dir.h"
  12#include "refs.h"
  13#include "branch.h"
  14#include "url.h"
  15#include "submodule.h"
  16#include "string-list.h"
  17#include "sha1-array.h"
  18#include "sigchain.h"
  19
  20static void set_upstreams(struct transport *transport, struct ref *refs,
  21        int pretend)
  22{
  23        struct ref *ref;
  24        for (ref = refs; ref; ref = ref->next) {
  25                const char *localname;
  26                const char *tmp;
  27                const char *remotename;
  28                unsigned char sha[20];
  29                int flag = 0;
  30                /*
  31                 * Check suitability for tracking. Must be successful /
  32                 * already up-to-date ref create/modify (not delete).
  33                 */
  34                if (ref->status != REF_STATUS_OK &&
  35                        ref->status != REF_STATUS_UPTODATE)
  36                        continue;
  37                if (!ref->peer_ref)
  38                        continue;
  39                if (is_null_oid(&ref->new_oid))
  40                        continue;
  41
  42                /* Follow symbolic refs (mainly for HEAD). */
  43                localname = ref->peer_ref->name;
  44                remotename = ref->name;
  45                tmp = resolve_ref_unsafe(localname, RESOLVE_REF_READING,
  46                                         sha, &flag);
  47                if (tmp && flag & REF_ISSYMREF &&
  48                        starts_with(tmp, "refs/heads/"))
  49                        localname = tmp;
  50
  51                /* Both source and destination must be local branches. */
  52                if (!localname || !starts_with(localname, "refs/heads/"))
  53                        continue;
  54                if (!remotename || !starts_with(remotename, "refs/heads/"))
  55                        continue;
  56
  57                if (!pretend)
  58                        install_branch_config(BRANCH_CONFIG_VERBOSE,
  59                                localname + 11, transport->remote->name,
  60                                remotename);
  61                else
  62                        printf("Would set upstream of '%s' to '%s' of '%s'\n",
  63                                localname + 11, remotename + 11,
  64                                transport->remote->name);
  65        }
  66}
  67
  68struct bundle_transport_data {
  69        int fd;
  70        struct bundle_header header;
  71};
  72
  73static struct ref *get_refs_from_bundle(struct transport *transport, int for_push)
  74{
  75        struct bundle_transport_data *data = transport->data;
  76        struct ref *result = NULL;
  77        int i;
  78
  79        if (for_push)
  80                return NULL;
  81
  82        if (data->fd > 0)
  83                close(data->fd);
  84        data->fd = read_bundle_header(transport->url, &data->header);
  85        if (data->fd < 0)
  86                die ("Could not read bundle '%s'.", transport->url);
  87        for (i = 0; i < data->header.references.nr; i++) {
  88                struct ref_list_entry *e = data->header.references.list + i;
  89                struct ref *ref = alloc_ref(e->name);
  90                hashcpy(ref->old_oid.hash, e->sha1);
  91                ref->next = result;
  92                result = ref;
  93        }
  94        return result;
  95}
  96
  97static int fetch_refs_from_bundle(struct transport *transport,
  98                               int nr_heads, struct ref **to_fetch)
  99{
 100        struct bundle_transport_data *data = transport->data;
 101        return unbundle(&data->header, data->fd,
 102                        transport->progress ? BUNDLE_VERBOSE : 0);
 103}
 104
 105static int close_bundle(struct transport *transport)
 106{
 107        struct bundle_transport_data *data = transport->data;
 108        if (data->fd > 0)
 109                close(data->fd);
 110        free(data);
 111        return 0;
 112}
 113
 114struct git_transport_data {
 115        struct git_transport_options options;
 116        struct child_process *conn;
 117        int fd[2];
 118        unsigned got_remote_heads : 1;
 119        struct sha1_array extra_have;
 120        struct sha1_array shallow;
 121};
 122
 123static int set_git_option(struct git_transport_options *opts,
 124                          const char *name, const char *value)
 125{
 126        if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 127                opts->uploadpack = value;
 128                return 0;
 129        } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 130                opts->receivepack = value;
 131                return 0;
 132        } else if (!strcmp(name, TRANS_OPT_THIN)) {
 133                opts->thin = !!value;
 134                return 0;
 135        } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
 136                opts->followtags = !!value;
 137                return 0;
 138        } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 139                opts->keep = !!value;
 140                return 0;
 141        } else if (!strcmp(name, TRANS_OPT_UPDATE_SHALLOW)) {
 142                opts->update_shallow = !!value;
 143                return 0;
 144        } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 145                if (!value)
 146                        opts->depth = 0;
 147                else {
 148                        char *end;
 149                        opts->depth = strtol(value, &end, 0);
 150                        if (*end)
 151                                die("transport: invalid depth option '%s'", value);
 152                }
 153                return 0;
 154        }
 155        return 1;
 156}
 157
 158static int connect_setup(struct transport *transport, int for_push)
 159{
 160        struct git_transport_data *data = transport->data;
 161        int flags = transport->verbose > 0 ? CONNECT_VERBOSE : 0;
 162
 163        if (data->conn)
 164                return 0;
 165
 166        switch (transport->family) {
 167        case TRANSPORT_FAMILY_ALL: break;
 168        case TRANSPORT_FAMILY_IPV4: flags |= CONNECT_IPV4; break;
 169        case TRANSPORT_FAMILY_IPV6: flags |= CONNECT_IPV6; break;
 170        }
 171
 172        data->conn = git_connect(data->fd, transport->url,
 173                                 for_push ? data->options.receivepack :
 174                                 data->options.uploadpack,
 175                                 flags);
 176
 177        return 0;
 178}
 179
 180static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
 181{
 182        struct git_transport_data *data = transport->data;
 183        struct ref *refs;
 184
 185        connect_setup(transport, for_push);
 186        get_remote_heads(data->fd[0], NULL, 0, &refs,
 187                         for_push ? REF_NORMAL : 0,
 188                         &data->extra_have,
 189                         &data->shallow);
 190        data->got_remote_heads = 1;
 191
 192        return refs;
 193}
 194
 195static int fetch_refs_via_pack(struct transport *transport,
 196                               int nr_heads, struct ref **to_fetch)
 197{
 198        struct git_transport_data *data = transport->data;
 199        struct ref *refs;
 200        char *dest = xstrdup(transport->url);
 201        struct fetch_pack_args args;
 202        struct ref *refs_tmp = NULL;
 203
 204        memset(&args, 0, sizeof(args));
 205        args.uploadpack = data->options.uploadpack;
 206        args.keep_pack = data->options.keep;
 207        args.lock_pack = 1;
 208        args.use_thin_pack = data->options.thin;
 209        args.include_tag = data->options.followtags;
 210        args.verbose = (transport->verbose > 1);
 211        args.quiet = (transport->verbose < 0);
 212        args.no_progress = !transport->progress;
 213        args.depth = data->options.depth;
 214        args.check_self_contained_and_connected =
 215                data->options.check_self_contained_and_connected;
 216        args.cloning = transport->cloning;
 217        args.update_shallow = data->options.update_shallow;
 218
 219        if (!data->got_remote_heads) {
 220                connect_setup(transport, 0);
 221                get_remote_heads(data->fd[0], NULL, 0, &refs_tmp, 0,
 222                                 NULL, &data->shallow);
 223                data->got_remote_heads = 1;
 224        }
 225
 226        refs = fetch_pack(&args, data->fd, data->conn,
 227                          refs_tmp ? refs_tmp : transport->remote_refs,
 228                          dest, to_fetch, nr_heads, &data->shallow,
 229                          &transport->pack_lockfile);
 230        close(data->fd[0]);
 231        close(data->fd[1]);
 232        if (finish_connect(data->conn)) {
 233                free_refs(refs);
 234                refs = NULL;
 235        }
 236        data->conn = NULL;
 237        data->got_remote_heads = 0;
 238        data->options.self_contained_and_connected =
 239                args.self_contained_and_connected;
 240
 241        free_refs(refs_tmp);
 242        free_refs(refs);
 243        free(dest);
 244        return (refs ? 0 : -1);
 245}
 246
 247static int push_had_errors(struct ref *ref)
 248{
 249        for (; ref; ref = ref->next) {
 250                switch (ref->status) {
 251                case REF_STATUS_NONE:
 252                case REF_STATUS_UPTODATE:
 253                case REF_STATUS_OK:
 254                        break;
 255                default:
 256                        return 1;
 257                }
 258        }
 259        return 0;
 260}
 261
 262int transport_refs_pushed(struct ref *ref)
 263{
 264        for (; ref; ref = ref->next) {
 265                switch(ref->status) {
 266                case REF_STATUS_NONE:
 267                case REF_STATUS_UPTODATE:
 268                        break;
 269                default:
 270                        return 1;
 271                }
 272        }
 273        return 0;
 274}
 275
 276void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 277{
 278        struct refspec rs;
 279
 280        if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 281                return;
 282
 283        rs.src = ref->name;
 284        rs.dst = NULL;
 285
 286        if (!remote_find_tracking(remote, &rs)) {
 287                if (verbose)
 288                        fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 289                if (ref->deletion) {
 290                        delete_ref(rs.dst, NULL, 0);
 291                } else
 292                        update_ref("update by push", rs.dst,
 293                                        ref->new_oid.hash, NULL, 0, 0);
 294                free(rs.dst);
 295        }
 296}
 297
 298static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg, int porcelain)
 299{
 300        if (porcelain) {
 301                if (from)
 302                        fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 303                else
 304                        fprintf(stdout, "%c\t:%s\t", flag, to->name);
 305                if (msg)
 306                        fprintf(stdout, "%s (%s)\n", summary, msg);
 307                else
 308                        fprintf(stdout, "%s\n", summary);
 309        } else {
 310                fprintf(stderr, " %c %-*s ", flag, TRANSPORT_SUMMARY_WIDTH, summary);
 311                if (from)
 312                        fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 313                else
 314                        fputs(prettify_refname(to->name), stderr);
 315                if (msg) {
 316                        fputs(" (", stderr);
 317                        fputs(msg, stderr);
 318                        fputc(')', stderr);
 319                }
 320                fputc('\n', stderr);
 321        }
 322}
 323
 324static const char *status_abbrev(unsigned char sha1[20])
 325{
 326        return find_unique_abbrev(sha1, DEFAULT_ABBREV);
 327}
 328
 329static void print_ok_ref_status(struct ref *ref, int porcelain)
 330{
 331        if (ref->deletion)
 332                print_ref_status('-', "[deleted]", ref, NULL, NULL, porcelain);
 333        else if (is_null_oid(&ref->old_oid))
 334                print_ref_status('*',
 335                        (starts_with(ref->name, "refs/tags/") ? "[new tag]" :
 336                        "[new branch]"),
 337                        ref, ref->peer_ref, NULL, porcelain);
 338        else {
 339                struct strbuf quickref = STRBUF_INIT;
 340                char type;
 341                const char *msg;
 342
 343                strbuf_addstr(&quickref, status_abbrev(ref->old_oid.hash));
 344                if (ref->forced_update) {
 345                        strbuf_addstr(&quickref, "...");
 346                        type = '+';
 347                        msg = "forced update";
 348                } else {
 349                        strbuf_addstr(&quickref, "..");
 350                        type = ' ';
 351                        msg = NULL;
 352                }
 353                strbuf_addstr(&quickref, status_abbrev(ref->new_oid.hash));
 354
 355                print_ref_status(type, quickref.buf, ref, ref->peer_ref, msg, porcelain);
 356                strbuf_release(&quickref);
 357        }
 358}
 359
 360static int print_one_push_status(struct ref *ref, const char *dest, int count, int porcelain)
 361{
 362        if (!count)
 363                fprintf(porcelain ? stdout : stderr, "To %s\n", dest);
 364
 365        switch(ref->status) {
 366        case REF_STATUS_NONE:
 367                print_ref_status('X', "[no match]", ref, NULL, NULL, porcelain);
 368                break;
 369        case REF_STATUS_REJECT_NODELETE:
 370                print_ref_status('!', "[rejected]", ref, NULL,
 371                                                 "remote does not support deleting refs", porcelain);
 372                break;
 373        case REF_STATUS_UPTODATE:
 374                print_ref_status('=', "[up to date]", ref,
 375                                                 ref->peer_ref, NULL, porcelain);
 376                break;
 377        case REF_STATUS_REJECT_NONFASTFORWARD:
 378                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 379                                                 "non-fast-forward", porcelain);
 380                break;
 381        case REF_STATUS_REJECT_ALREADY_EXISTS:
 382                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 383                                                 "already exists", porcelain);
 384                break;
 385        case REF_STATUS_REJECT_FETCH_FIRST:
 386                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 387                                                 "fetch first", porcelain);
 388                break;
 389        case REF_STATUS_REJECT_NEEDS_FORCE:
 390                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 391                                                 "needs force", porcelain);
 392                break;
 393        case REF_STATUS_REJECT_STALE:
 394                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 395                                                 "stale info", porcelain);
 396                break;
 397        case REF_STATUS_REJECT_SHALLOW:
 398                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 399                                                 "new shallow roots not allowed", porcelain);
 400                break;
 401        case REF_STATUS_REMOTE_REJECT:
 402                print_ref_status('!', "[remote rejected]", ref,
 403                                                 ref->deletion ? NULL : ref->peer_ref,
 404                                                 ref->remote_status, porcelain);
 405                break;
 406        case REF_STATUS_EXPECTING_REPORT:
 407                print_ref_status('!', "[remote failure]", ref,
 408                                                 ref->deletion ? NULL : ref->peer_ref,
 409                                                 "remote failed to report status", porcelain);
 410                break;
 411        case REF_STATUS_ATOMIC_PUSH_FAILED:
 412                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 413                                                 "atomic push failed", porcelain);
 414                break;
 415        case REF_STATUS_OK:
 416                print_ok_ref_status(ref, porcelain);
 417                break;
 418        }
 419
 420        return 1;
 421}
 422
 423void transport_print_push_status(const char *dest, struct ref *refs,
 424                                  int verbose, int porcelain, unsigned int *reject_reasons)
 425{
 426        struct ref *ref;
 427        int n = 0;
 428        unsigned char head_sha1[20];
 429        char *head;
 430
 431        head = resolve_refdup("HEAD", RESOLVE_REF_READING, head_sha1, NULL);
 432
 433        if (verbose) {
 434                for (ref = refs; ref; ref = ref->next)
 435                        if (ref->status == REF_STATUS_UPTODATE)
 436                                n += print_one_push_status(ref, dest, n, porcelain);
 437        }
 438
 439        for (ref = refs; ref; ref = ref->next)
 440                if (ref->status == REF_STATUS_OK)
 441                        n += print_one_push_status(ref, dest, n, porcelain);
 442
 443        *reject_reasons = 0;
 444        for (ref = refs; ref; ref = ref->next) {
 445                if (ref->status != REF_STATUS_NONE &&
 446                    ref->status != REF_STATUS_UPTODATE &&
 447                    ref->status != REF_STATUS_OK)
 448                        n += print_one_push_status(ref, dest, n, porcelain);
 449                if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
 450                        if (head != NULL && !strcmp(head, ref->name))
 451                                *reject_reasons |= REJECT_NON_FF_HEAD;
 452                        else
 453                                *reject_reasons |= REJECT_NON_FF_OTHER;
 454                } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
 455                        *reject_reasons |= REJECT_ALREADY_EXISTS;
 456                } else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
 457                        *reject_reasons |= REJECT_FETCH_FIRST;
 458                } else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
 459                        *reject_reasons |= REJECT_NEEDS_FORCE;
 460                }
 461        }
 462        free(head);
 463}
 464
 465void transport_verify_remote_names(int nr_heads, const char **heads)
 466{
 467        int i;
 468
 469        for (i = 0; i < nr_heads; i++) {
 470                const char *local = heads[i];
 471                const char *remote = strrchr(heads[i], ':');
 472
 473                if (*local == '+')
 474                        local++;
 475
 476                /* A matching refspec is okay.  */
 477                if (remote == local && remote[1] == '\0')
 478                        continue;
 479
 480                remote = remote ? (remote + 1) : local;
 481                if (check_refname_format(remote,
 482                                REFNAME_ALLOW_ONELEVEL|REFNAME_REFSPEC_PATTERN))
 483                        die("remote part of refspec is not a valid name in %s",
 484                                heads[i]);
 485        }
 486}
 487
 488static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 489{
 490        struct git_transport_data *data = transport->data;
 491        struct send_pack_args args;
 492        int ret;
 493
 494        if (!data->got_remote_heads) {
 495                struct ref *tmp_refs;
 496                connect_setup(transport, 1);
 497
 498                get_remote_heads(data->fd[0], NULL, 0, &tmp_refs, REF_NORMAL,
 499                                 NULL, &data->shallow);
 500                data->got_remote_heads = 1;
 501        }
 502
 503        memset(&args, 0, sizeof(args));
 504        args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 505        args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 506        args.use_thin_pack = data->options.thin;
 507        args.verbose = (transport->verbose > 0);
 508        args.quiet = (transport->verbose < 0);
 509        args.progress = transport->progress;
 510        args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 511        args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
 512        args.atomic = !!(flags & TRANSPORT_PUSH_ATOMIC);
 513        args.url = transport->url;
 514
 515        if (flags & TRANSPORT_PUSH_CERT_ALWAYS)
 516                args.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 517        else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED)
 518                args.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 519        else
 520                args.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 521
 522        ret = send_pack(&args, data->fd, data->conn, remote_refs,
 523                        &data->extra_have);
 524
 525        close(data->fd[1]);
 526        close(data->fd[0]);
 527        ret |= finish_connect(data->conn);
 528        data->conn = NULL;
 529        data->got_remote_heads = 0;
 530
 531        return ret;
 532}
 533
 534static int connect_git(struct transport *transport, const char *name,
 535                       const char *executable, int fd[2])
 536{
 537        struct git_transport_data *data = transport->data;
 538        data->conn = git_connect(data->fd, transport->url,
 539                                 executable, 0);
 540        fd[0] = data->fd[0];
 541        fd[1] = data->fd[1];
 542        return 0;
 543}
 544
 545static int disconnect_git(struct transport *transport)
 546{
 547        struct git_transport_data *data = transport->data;
 548        if (data->conn) {
 549                if (data->got_remote_heads)
 550                        packet_flush(data->fd[1]);
 551                close(data->fd[0]);
 552                close(data->fd[1]);
 553                finish_connect(data->conn);
 554        }
 555
 556        free(data);
 557        return 0;
 558}
 559
 560void transport_take_over(struct transport *transport,
 561                         struct child_process *child)
 562{
 563        struct git_transport_data *data;
 564
 565        if (!transport->smart_options)
 566                die("Bug detected: Taking over transport requires non-NULL "
 567                    "smart_options field.");
 568
 569        data = xcalloc(1, sizeof(*data));
 570        data->options = *transport->smart_options;
 571        data->conn = child;
 572        data->fd[0] = data->conn->out;
 573        data->fd[1] = data->conn->in;
 574        data->got_remote_heads = 0;
 575        transport->data = data;
 576
 577        transport->set_option = NULL;
 578        transport->get_refs_list = get_refs_via_connect;
 579        transport->fetch = fetch_refs_via_pack;
 580        transport->push = NULL;
 581        transport->push_refs = git_transport_push;
 582        transport->disconnect = disconnect_git;
 583        transport->smart_options = &(data->options);
 584
 585        transport->cannot_reuse = 1;
 586}
 587
 588static int is_file(const char *url)
 589{
 590        struct stat buf;
 591        if (stat(url, &buf))
 592                return 0;
 593        return S_ISREG(buf.st_mode);
 594}
 595
 596static int external_specification_len(const char *url)
 597{
 598        return strchr(url, ':') - url;
 599}
 600
 601static const struct string_list *protocol_whitelist(void)
 602{
 603        static int enabled = -1;
 604        static struct string_list allowed = STRING_LIST_INIT_DUP;
 605
 606        if (enabled < 0) {
 607                const char *v = getenv("GIT_ALLOW_PROTOCOL");
 608                if (v) {
 609                        string_list_split(&allowed, v, ':', -1);
 610                        string_list_sort(&allowed);
 611                        enabled = 1;
 612                } else {
 613                        enabled = 0;
 614                }
 615        }
 616
 617        return enabled ? &allowed : NULL;
 618}
 619
 620int is_transport_allowed(const char *type)
 621{
 622        const struct string_list *allowed = protocol_whitelist();
 623        return !allowed || string_list_has_string(allowed, type);
 624}
 625
 626void transport_check_allowed(const char *type)
 627{
 628        if (!is_transport_allowed(type))
 629                die("transport '%s' not allowed", type);
 630}
 631
 632int transport_restrict_protocols(void)
 633{
 634        return !!protocol_whitelist();
 635}
 636
 637struct transport *transport_get(struct remote *remote, const char *url)
 638{
 639        const char *helper;
 640        struct transport *ret = xcalloc(1, sizeof(*ret));
 641
 642        ret->progress = isatty(2);
 643
 644        if (!remote)
 645                die("No remote provided to transport_get()");
 646
 647        ret->got_remote_refs = 0;
 648        ret->remote = remote;
 649        helper = remote->foreign_vcs;
 650
 651        if (!url && remote->url)
 652                url = remote->url[0];
 653        ret->url = url;
 654
 655        /* maybe it is a foreign URL? */
 656        if (url) {
 657                const char *p = url;
 658
 659                while (is_urlschemechar(p == url, *p))
 660                        p++;
 661                if (starts_with(p, "::"))
 662                        helper = xstrndup(url, p - url);
 663        }
 664
 665        if (helper) {
 666                transport_helper_init(ret, helper);
 667        } else if (starts_with(url, "rsync:")) {
 668                die("git-over-rsync is no longer supported");
 669        } else if (url_is_local_not_ssh(url) && is_file(url) && is_bundle(url, 1)) {
 670                struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 671                transport_check_allowed("file");
 672                ret->data = data;
 673                ret->get_refs_list = get_refs_from_bundle;
 674                ret->fetch = fetch_refs_from_bundle;
 675                ret->disconnect = close_bundle;
 676                ret->smart_options = NULL;
 677        } else if (!is_url(url)
 678                || starts_with(url, "file://")
 679                || starts_with(url, "git://")
 680                || starts_with(url, "ssh://")
 681                || starts_with(url, "git+ssh://") /* deprecated - do not use */
 682                || starts_with(url, "ssh+git://") /* deprecated - do not use */
 683                ) {
 684                /*
 685                 * These are builtin smart transports; "allowed" transports
 686                 * will be checked individually in git_connect.
 687                 */
 688                struct git_transport_data *data = xcalloc(1, sizeof(*data));
 689                ret->data = data;
 690                ret->set_option = NULL;
 691                ret->get_refs_list = get_refs_via_connect;
 692                ret->fetch = fetch_refs_via_pack;
 693                ret->push_refs = git_transport_push;
 694                ret->connect = connect_git;
 695                ret->disconnect = disconnect_git;
 696                ret->smart_options = &(data->options);
 697
 698                data->conn = NULL;
 699                data->got_remote_heads = 0;
 700        } else {
 701                /* Unknown protocol in URL. Pass to external handler. */
 702                int len = external_specification_len(url);
 703                char *handler = xmemdupz(url, len);
 704                transport_helper_init(ret, handler);
 705        }
 706
 707        if (ret->smart_options) {
 708                ret->smart_options->thin = 1;
 709                ret->smart_options->uploadpack = "git-upload-pack";
 710                if (remote->uploadpack)
 711                        ret->smart_options->uploadpack = remote->uploadpack;
 712                ret->smart_options->receivepack = "git-receive-pack";
 713                if (remote->receivepack)
 714                        ret->smart_options->receivepack = remote->receivepack;
 715        }
 716
 717        return ret;
 718}
 719
 720int transport_set_option(struct transport *transport,
 721                         const char *name, const char *value)
 722{
 723        int git_reports = 1, protocol_reports = 1;
 724
 725        if (transport->smart_options)
 726                git_reports = set_git_option(transport->smart_options,
 727                                             name, value);
 728
 729        if (transport->set_option)
 730                protocol_reports = transport->set_option(transport, name,
 731                                                        value);
 732
 733        /* If either report is 0, report 0 (success). */
 734        if (!git_reports || !protocol_reports)
 735                return 0;
 736        /* If either reports -1 (invalid value), report -1. */
 737        if ((git_reports == -1) || (protocol_reports == -1))
 738                return -1;
 739        /* Otherwise if both report unknown, report unknown. */
 740        return 1;
 741}
 742
 743void transport_set_verbosity(struct transport *transport, int verbosity,
 744        int force_progress)
 745{
 746        if (verbosity >= 1)
 747                transport->verbose = verbosity <= 3 ? verbosity : 3;
 748        if (verbosity < 0)
 749                transport->verbose = -1;
 750
 751        /**
 752         * Rules used to determine whether to report progress (processing aborts
 753         * when a rule is satisfied):
 754         *
 755         *   . Report progress, if force_progress is 1 (ie. --progress).
 756         *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
 757         *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
 758         *   . Report progress if isatty(2) is 1.
 759         **/
 760        if (force_progress >= 0)
 761                transport->progress = !!force_progress;
 762        else
 763                transport->progress = verbosity >= 0 && isatty(2);
 764}
 765
 766static void die_with_unpushed_submodules(struct string_list *needs_pushing)
 767{
 768        int i;
 769
 770        fprintf(stderr, "The following submodule paths contain changes that can\n"
 771                        "not be found on any remote:\n");
 772        for (i = 0; i < needs_pushing->nr; i++)
 773                printf("  %s\n", needs_pushing->items[i].string);
 774        fprintf(stderr, "\nPlease try\n\n"
 775                        "       git push --recurse-submodules=on-demand\n\n"
 776                        "or cd to the path and use\n\n"
 777                        "       git push\n\n"
 778                        "to push them to a remote.\n\n");
 779
 780        string_list_clear(needs_pushing, 0);
 781
 782        die("Aborting.");
 783}
 784
 785static int run_pre_push_hook(struct transport *transport,
 786                             struct ref *remote_refs)
 787{
 788        int ret = 0, x;
 789        struct ref *r;
 790        struct child_process proc = CHILD_PROCESS_INIT;
 791        struct strbuf buf;
 792        const char *argv[4];
 793
 794        if (!(argv[0] = find_hook("pre-push")))
 795                return 0;
 796
 797        argv[1] = transport->remote->name;
 798        argv[2] = transport->url;
 799        argv[3] = NULL;
 800
 801        proc.argv = argv;
 802        proc.in = -1;
 803
 804        if (start_command(&proc)) {
 805                finish_command(&proc);
 806                return -1;
 807        }
 808
 809        sigchain_push(SIGPIPE, SIG_IGN);
 810
 811        strbuf_init(&buf, 256);
 812
 813        for (r = remote_refs; r; r = r->next) {
 814                if (!r->peer_ref) continue;
 815                if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
 816                if (r->status == REF_STATUS_REJECT_STALE) continue;
 817                if (r->status == REF_STATUS_UPTODATE) continue;
 818
 819                strbuf_reset(&buf);
 820                strbuf_addf( &buf, "%s %s %s %s\n",
 821                         r->peer_ref->name, oid_to_hex(&r->new_oid),
 822                         r->name, oid_to_hex(&r->old_oid));
 823
 824                if (write_in_full(proc.in, buf.buf, buf.len) < 0) {
 825                        /* We do not mind if a hook does not read all refs. */
 826                        if (errno != EPIPE)
 827                                ret = -1;
 828                        break;
 829                }
 830        }
 831
 832        strbuf_release(&buf);
 833
 834        x = close(proc.in);
 835        if (!ret)
 836                ret = x;
 837
 838        sigchain_pop(SIGPIPE);
 839
 840        x = finish_command(&proc);
 841        if (!ret)
 842                ret = x;
 843
 844        return ret;
 845}
 846
 847int transport_push(struct transport *transport,
 848                   int refspec_nr, const char **refspec, int flags,
 849                   unsigned int *reject_reasons)
 850{
 851        *reject_reasons = 0;
 852        transport_verify_remote_names(refspec_nr, refspec);
 853
 854        if (transport->push) {
 855                /* Maybe FIXME. But no important transport uses this case. */
 856                if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
 857                        die("This transport does not support using --set-upstream");
 858
 859                return transport->push(transport, refspec_nr, refspec, flags);
 860        } else if (transport->push_refs) {
 861                struct ref *remote_refs;
 862                struct ref *local_refs = get_local_heads();
 863                int match_flags = MATCH_REFS_NONE;
 864                int verbose = (transport->verbose > 0);
 865                int quiet = (transport->verbose < 0);
 866                int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
 867                int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
 868                int push_ret, ret, err;
 869
 870                if (check_push_refs(local_refs, refspec_nr, refspec) < 0)
 871                        return -1;
 872
 873                remote_refs = transport->get_refs_list(transport, 1);
 874
 875                if (flags & TRANSPORT_PUSH_ALL)
 876                        match_flags |= MATCH_REFS_ALL;
 877                if (flags & TRANSPORT_PUSH_MIRROR)
 878                        match_flags |= MATCH_REFS_MIRROR;
 879                if (flags & TRANSPORT_PUSH_PRUNE)
 880                        match_flags |= MATCH_REFS_PRUNE;
 881                if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
 882                        match_flags |= MATCH_REFS_FOLLOW_TAGS;
 883
 884                if (match_push_refs(local_refs, &remote_refs,
 885                                    refspec_nr, refspec, match_flags)) {
 886                        return -1;
 887                }
 888
 889                if (transport->smart_options &&
 890                    transport->smart_options->cas &&
 891                    !is_empty_cas(transport->smart_options->cas))
 892                        apply_push_cas(transport->smart_options->cas,
 893                                       transport->remote, remote_refs);
 894
 895                set_ref_status_for_push(remote_refs,
 896                        flags & TRANSPORT_PUSH_MIRROR,
 897                        flags & TRANSPORT_PUSH_FORCE);
 898
 899                if (!(flags & TRANSPORT_PUSH_NO_HOOK))
 900                        if (run_pre_push_hook(transport, remote_refs))
 901                                return -1;
 902
 903                if ((flags & TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND) && !is_bare_repository()) {
 904                        struct ref *ref = remote_refs;
 905                        for (; ref; ref = ref->next)
 906                                if (!is_null_oid(&ref->new_oid) &&
 907                                    !push_unpushed_submodules(ref->new_oid.hash,
 908                                            transport->remote->name))
 909                                    die ("Failed to push all needed submodules!");
 910                }
 911
 912                if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
 913                              TRANSPORT_RECURSE_SUBMODULES_CHECK)) && !is_bare_repository()) {
 914                        struct ref *ref = remote_refs;
 915                        struct string_list needs_pushing = STRING_LIST_INIT_DUP;
 916
 917                        for (; ref; ref = ref->next)
 918                                if (!is_null_oid(&ref->new_oid) &&
 919                                    find_unpushed_submodules(ref->new_oid.hash,
 920                                            transport->remote->name, &needs_pushing))
 921                                        die_with_unpushed_submodules(&needs_pushing);
 922                }
 923
 924                push_ret = transport->push_refs(transport, remote_refs, flags);
 925                err = push_had_errors(remote_refs);
 926                ret = push_ret | err;
 927
 928                if (!quiet || err)
 929                        transport_print_push_status(transport->url, remote_refs,
 930                                        verbose | porcelain, porcelain,
 931                                        reject_reasons);
 932
 933                if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
 934                        set_upstreams(transport, remote_refs, pretend);
 935
 936                if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
 937                        struct ref *ref;
 938                        for (ref = remote_refs; ref; ref = ref->next)
 939                                transport_update_tracking_ref(transport->remote, ref, verbose);
 940                }
 941
 942                if (porcelain && !push_ret)
 943                        puts("Done");
 944                else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
 945                        fprintf(stderr, "Everything up-to-date\n");
 946
 947                return ret;
 948        }
 949        return 1;
 950}
 951
 952const struct ref *transport_get_remote_refs(struct transport *transport)
 953{
 954        if (!transport->got_remote_refs) {
 955                transport->remote_refs = transport->get_refs_list(transport, 0);
 956                transport->got_remote_refs = 1;
 957        }
 958
 959        return transport->remote_refs;
 960}
 961
 962int transport_fetch_refs(struct transport *transport, struct ref *refs)
 963{
 964        int rc;
 965        int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
 966        struct ref **heads = NULL;
 967        struct ref *rm;
 968
 969        for (rm = refs; rm; rm = rm->next) {
 970                nr_refs++;
 971                if (rm->peer_ref &&
 972                    !is_null_oid(&rm->old_oid) &&
 973                    !oidcmp(&rm->peer_ref->old_oid, &rm->old_oid))
 974                        continue;
 975                ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
 976                heads[nr_heads++] = rm;
 977        }
 978
 979        if (!nr_heads) {
 980                /*
 981                 * When deepening of a shallow repository is requested,
 982                 * then local and remote refs are likely to still be equal.
 983                 * Just feed them all to the fetch method in that case.
 984                 * This condition shouldn't be met in a non-deepening fetch
 985                 * (see builtin/fetch.c:quickfetch()).
 986                 */
 987                ALLOC_ARRAY(heads, nr_refs);
 988                for (rm = refs; rm; rm = rm->next)
 989                        heads[nr_heads++] = rm;
 990        }
 991
 992        rc = transport->fetch(transport, nr_heads, heads);
 993
 994        free(heads);
 995        return rc;
 996}
 997
 998void transport_unlock_pack(struct transport *transport)
 999{
1000        if (transport->pack_lockfile) {
1001                unlink_or_warn(transport->pack_lockfile);
1002                free(transport->pack_lockfile);
1003                transport->pack_lockfile = NULL;
1004        }
1005}
1006
1007int transport_connect(struct transport *transport, const char *name,
1008                      const char *exec, int fd[2])
1009{
1010        if (transport->connect)
1011                return transport->connect(transport, name, exec, fd);
1012        else
1013                die("Operation not supported by protocol");
1014}
1015
1016int transport_disconnect(struct transport *transport)
1017{
1018        int ret = 0;
1019        if (transport->disconnect)
1020                ret = transport->disconnect(transport);
1021        free(transport);
1022        return ret;
1023}
1024
1025/*
1026 * Strip username (and password) from a URL and return
1027 * it in a newly allocated string.
1028 */
1029char *transport_anonymize_url(const char *url)
1030{
1031        char *scheme_prefix, *anon_part;
1032        size_t anon_len, prefix_len = 0;
1033
1034        anon_part = strchr(url, '@');
1035        if (url_is_local_not_ssh(url) || !anon_part)
1036                goto literal_copy;
1037
1038        anon_len = strlen(++anon_part);
1039        scheme_prefix = strstr(url, "://");
1040        if (!scheme_prefix) {
1041                if (!strchr(anon_part, ':'))
1042                        /* cannot be "me@there:/path/name" */
1043                        goto literal_copy;
1044        } else {
1045                const char *cp;
1046                /* make sure scheme is reasonable */
1047                for (cp = url; cp < scheme_prefix; cp++) {
1048                        switch (*cp) {
1049                                /* RFC 1738 2.1 */
1050                        case '+': case '.': case '-':
1051                                break; /* ok */
1052                        default:
1053                                if (isalnum(*cp))
1054                                        break;
1055                                /* it isn't */
1056                                goto literal_copy;
1057                        }
1058                }
1059                /* @ past the first slash does not count */
1060                cp = strchr(scheme_prefix + 3, '/');
1061                if (cp && cp < anon_part)
1062                        goto literal_copy;
1063                prefix_len = scheme_prefix - url + 3;
1064        }
1065        return xstrfmt("%.*s%.*s", (int)prefix_len, url,
1066                       (int)anon_len, anon_part);
1067literal_copy:
1068        return xstrdup(url);
1069}
1070
1071struct alternate_refs_data {
1072        alternate_ref_fn *fn;
1073        void *data;
1074};
1075
1076static int refs_from_alternate_cb(struct alternate_object_database *e,
1077                                  void *data)
1078{
1079        char *other;
1080        size_t len;
1081        struct remote *remote;
1082        struct transport *transport;
1083        const struct ref *extra;
1084        struct alternate_refs_data *cb = data;
1085
1086        e->name[-1] = '\0';
1087        other = xstrdup(real_path(e->base));
1088        e->name[-1] = '/';
1089        len = strlen(other);
1090
1091        while (other[len-1] == '/')
1092                other[--len] = '\0';
1093        if (len < 8 || memcmp(other + len - 8, "/objects", 8))
1094                goto out;
1095        /* Is this a git repository with refs? */
1096        memcpy(other + len - 8, "/refs", 6);
1097        if (!is_directory(other))
1098                goto out;
1099        other[len - 8] = '\0';
1100        remote = remote_get(other);
1101        transport = transport_get(remote, other);
1102        for (extra = transport_get_remote_refs(transport);
1103             extra;
1104             extra = extra->next)
1105                cb->fn(extra, cb->data);
1106        transport_disconnect(transport);
1107out:
1108        free(other);
1109        return 0;
1110}
1111
1112void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1113{
1114        struct alternate_refs_data cb;
1115        cb.fn = fn;
1116        cb.data = data;
1117        foreach_alt_odb(refs_from_alternate_cb, &cb);
1118}