Andrew's git / gitweb.git / transport.c
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transport.con commit Merge branch 'jk/test-path-utils-xsnprintf' (790dd33)
   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        data->conn = git_connect(data->fd, transport->url,
 167                                 for_push ? data->options.receivepack :
 168                                 data->options.uploadpack,
 169                                 flags);
 170
 171        return 0;
 172}
 173
 174static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
 175{
 176        struct git_transport_data *data = transport->data;
 177        struct ref *refs;
 178
 179        connect_setup(transport, for_push);
 180        get_remote_heads(data->fd[0], NULL, 0, &refs,
 181                         for_push ? REF_NORMAL : 0,
 182                         &data->extra_have,
 183                         &data->shallow);
 184        data->got_remote_heads = 1;
 185
 186        return refs;
 187}
 188
 189static int fetch_refs_via_pack(struct transport *transport,
 190                               int nr_heads, struct ref **to_fetch)
 191{
 192        struct git_transport_data *data = transport->data;
 193        struct ref *refs;
 194        char *dest = xstrdup(transport->url);
 195        struct fetch_pack_args args;
 196        struct ref *refs_tmp = NULL;
 197
 198        memset(&args, 0, sizeof(args));
 199        args.uploadpack = data->options.uploadpack;
 200        args.keep_pack = data->options.keep;
 201        args.lock_pack = 1;
 202        args.use_thin_pack = data->options.thin;
 203        args.include_tag = data->options.followtags;
 204        args.verbose = (transport->verbose > 1);
 205        args.quiet = (transport->verbose < 0);
 206        args.no_progress = !transport->progress;
 207        args.depth = data->options.depth;
 208        args.check_self_contained_and_connected =
 209                data->options.check_self_contained_and_connected;
 210        args.cloning = transport->cloning;
 211        args.update_shallow = data->options.update_shallow;
 212
 213        if (!data->got_remote_heads) {
 214                connect_setup(transport, 0);
 215                get_remote_heads(data->fd[0], NULL, 0, &refs_tmp, 0,
 216                                 NULL, &data->shallow);
 217                data->got_remote_heads = 1;
 218        }
 219
 220        refs = fetch_pack(&args, data->fd, data->conn,
 221                          refs_tmp ? refs_tmp : transport->remote_refs,
 222                          dest, to_fetch, nr_heads, &data->shallow,
 223                          &transport->pack_lockfile);
 224        close(data->fd[0]);
 225        close(data->fd[1]);
 226        if (finish_connect(data->conn)) {
 227                free_refs(refs);
 228                refs = NULL;
 229        }
 230        data->conn = NULL;
 231        data->got_remote_heads = 0;
 232        data->options.self_contained_and_connected =
 233                args.self_contained_and_connected;
 234
 235        free_refs(refs_tmp);
 236        free_refs(refs);
 237        free(dest);
 238        return (refs ? 0 : -1);
 239}
 240
 241static int push_had_errors(struct ref *ref)
 242{
 243        for (; ref; ref = ref->next) {
 244                switch (ref->status) {
 245                case REF_STATUS_NONE:
 246                case REF_STATUS_UPTODATE:
 247                case REF_STATUS_OK:
 248                        break;
 249                default:
 250                        return 1;
 251                }
 252        }
 253        return 0;
 254}
 255
 256int transport_refs_pushed(struct ref *ref)
 257{
 258        for (; ref; ref = ref->next) {
 259                switch(ref->status) {
 260                case REF_STATUS_NONE:
 261                case REF_STATUS_UPTODATE:
 262                        break;
 263                default:
 264                        return 1;
 265                }
 266        }
 267        return 0;
 268}
 269
 270void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 271{
 272        struct refspec rs;
 273
 274        if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 275                return;
 276
 277        rs.src = ref->name;
 278        rs.dst = NULL;
 279
 280        if (!remote_find_tracking(remote, &rs)) {
 281                if (verbose)
 282                        fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 283                if (ref->deletion) {
 284                        delete_ref(rs.dst, NULL, 0);
 285                } else
 286                        update_ref("update by push", rs.dst,
 287                                        ref->new_oid.hash, NULL, 0, 0);
 288                free(rs.dst);
 289        }
 290}
 291
 292static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg, int porcelain)
 293{
 294        if (porcelain) {
 295                if (from)
 296                        fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 297                else
 298                        fprintf(stdout, "%c\t:%s\t", flag, to->name);
 299                if (msg)
 300                        fprintf(stdout, "%s (%s)\n", summary, msg);
 301                else
 302                        fprintf(stdout, "%s\n", summary);
 303        } else {
 304                fprintf(stderr, " %c %-*s ", flag, TRANSPORT_SUMMARY_WIDTH, summary);
 305                if (from)
 306                        fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 307                else
 308                        fputs(prettify_refname(to->name), stderr);
 309                if (msg) {
 310                        fputs(" (", stderr);
 311                        fputs(msg, stderr);
 312                        fputc(')', stderr);
 313                }
 314                fputc('\n', stderr);
 315        }
 316}
 317
 318static const char *status_abbrev(unsigned char sha1[20])
 319{
 320        return find_unique_abbrev(sha1, DEFAULT_ABBREV);
 321}
 322
 323static void print_ok_ref_status(struct ref *ref, int porcelain)
 324{
 325        if (ref->deletion)
 326                print_ref_status('-', "[deleted]", ref, NULL, NULL, porcelain);
 327        else if (is_null_oid(&ref->old_oid))
 328                print_ref_status('*',
 329                        (starts_with(ref->name, "refs/tags/") ? "[new tag]" :
 330                        "[new branch]"),
 331                        ref, ref->peer_ref, NULL, porcelain);
 332        else {
 333                struct strbuf quickref = STRBUF_INIT;
 334                char type;
 335                const char *msg;
 336
 337                strbuf_addstr(&quickref, status_abbrev(ref->old_oid.hash));
 338                if (ref->forced_update) {
 339                        strbuf_addstr(&quickref, "...");
 340                        type = '+';
 341                        msg = "forced update";
 342                } else {
 343                        strbuf_addstr(&quickref, "..");
 344                        type = ' ';
 345                        msg = NULL;
 346                }
 347                strbuf_addstr(&quickref, status_abbrev(ref->new_oid.hash));
 348
 349                print_ref_status(type, quickref.buf, ref, ref->peer_ref, msg, porcelain);
 350                strbuf_release(&quickref);
 351        }
 352}
 353
 354static int print_one_push_status(struct ref *ref, const char *dest, int count, int porcelain)
 355{
 356        if (!count)
 357                fprintf(porcelain ? stdout : stderr, "To %s\n", dest);
 358
 359        switch(ref->status) {
 360        case REF_STATUS_NONE:
 361                print_ref_status('X', "[no match]", ref, NULL, NULL, porcelain);
 362                break;
 363        case REF_STATUS_REJECT_NODELETE:
 364                print_ref_status('!', "[rejected]", ref, NULL,
 365                                                 "remote does not support deleting refs", porcelain);
 366                break;
 367        case REF_STATUS_UPTODATE:
 368                print_ref_status('=', "[up to date]", ref,
 369                                                 ref->peer_ref, NULL, porcelain);
 370                break;
 371        case REF_STATUS_REJECT_NONFASTFORWARD:
 372                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 373                                                 "non-fast-forward", porcelain);
 374                break;
 375        case REF_STATUS_REJECT_ALREADY_EXISTS:
 376                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 377                                                 "already exists", porcelain);
 378                break;
 379        case REF_STATUS_REJECT_FETCH_FIRST:
 380                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 381                                                 "fetch first", porcelain);
 382                break;
 383        case REF_STATUS_REJECT_NEEDS_FORCE:
 384                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 385                                                 "needs force", porcelain);
 386                break;
 387        case REF_STATUS_REJECT_STALE:
 388                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 389                                                 "stale info", porcelain);
 390                break;
 391        case REF_STATUS_REJECT_SHALLOW:
 392                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 393                                                 "new shallow roots not allowed", porcelain);
 394                break;
 395        case REF_STATUS_REMOTE_REJECT:
 396                print_ref_status('!', "[remote rejected]", ref,
 397                                                 ref->deletion ? NULL : ref->peer_ref,
 398                                                 ref->remote_status, porcelain);
 399                break;
 400        case REF_STATUS_EXPECTING_REPORT:
 401                print_ref_status('!', "[remote failure]", ref,
 402                                                 ref->deletion ? NULL : ref->peer_ref,
 403                                                 "remote failed to report status", porcelain);
 404                break;
 405        case REF_STATUS_ATOMIC_PUSH_FAILED:
 406                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 407                                                 "atomic push failed", porcelain);
 408                break;
 409        case REF_STATUS_OK:
 410                print_ok_ref_status(ref, porcelain);
 411                break;
 412        }
 413
 414        return 1;
 415}
 416
 417void transport_print_push_status(const char *dest, struct ref *refs,
 418                                  int verbose, int porcelain, unsigned int *reject_reasons)
 419{
 420        struct ref *ref;
 421        int n = 0;
 422        unsigned char head_sha1[20];
 423        char *head;
 424
 425        head = resolve_refdup("HEAD", RESOLVE_REF_READING, head_sha1, NULL);
 426
 427        if (verbose) {
 428                for (ref = refs; ref; ref = ref->next)
 429                        if (ref->status == REF_STATUS_UPTODATE)
 430                                n += print_one_push_status(ref, dest, n, porcelain);
 431        }
 432
 433        for (ref = refs; ref; ref = ref->next)
 434                if (ref->status == REF_STATUS_OK)
 435                        n += print_one_push_status(ref, dest, n, porcelain);
 436
 437        *reject_reasons = 0;
 438        for (ref = refs; ref; ref = ref->next) {
 439                if (ref->status != REF_STATUS_NONE &&
 440                    ref->status != REF_STATUS_UPTODATE &&
 441                    ref->status != REF_STATUS_OK)
 442                        n += print_one_push_status(ref, dest, n, porcelain);
 443                if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
 444                        if (head != NULL && !strcmp(head, ref->name))
 445                                *reject_reasons |= REJECT_NON_FF_HEAD;
 446                        else
 447                                *reject_reasons |= REJECT_NON_FF_OTHER;
 448                } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
 449                        *reject_reasons |= REJECT_ALREADY_EXISTS;
 450                } else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
 451                        *reject_reasons |= REJECT_FETCH_FIRST;
 452                } else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
 453                        *reject_reasons |= REJECT_NEEDS_FORCE;
 454                }
 455        }
 456        free(head);
 457}
 458
 459void transport_verify_remote_names(int nr_heads, const char **heads)
 460{
 461        int i;
 462
 463        for (i = 0; i < nr_heads; i++) {
 464                const char *local = heads[i];
 465                const char *remote = strrchr(heads[i], ':');
 466
 467                if (*local == '+')
 468                        local++;
 469
 470                /* A matching refspec is okay.  */
 471                if (remote == local && remote[1] == '\0')
 472                        continue;
 473
 474                remote = remote ? (remote + 1) : local;
 475                if (check_refname_format(remote,
 476                                REFNAME_ALLOW_ONELEVEL|REFNAME_REFSPEC_PATTERN))
 477                        die("remote part of refspec is not a valid name in %s",
 478                                heads[i]);
 479        }
 480}
 481
 482static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 483{
 484        struct git_transport_data *data = transport->data;
 485        struct send_pack_args args;
 486        int ret;
 487
 488        if (!data->got_remote_heads) {
 489                struct ref *tmp_refs;
 490                connect_setup(transport, 1);
 491
 492                get_remote_heads(data->fd[0], NULL, 0, &tmp_refs, REF_NORMAL,
 493                                 NULL, &data->shallow);
 494                data->got_remote_heads = 1;
 495        }
 496
 497        memset(&args, 0, sizeof(args));
 498        args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 499        args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 500        args.use_thin_pack = data->options.thin;
 501        args.verbose = (transport->verbose > 0);
 502        args.quiet = (transport->verbose < 0);
 503        args.progress = transport->progress;
 504        args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 505        args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
 506        args.atomic = !!(flags & TRANSPORT_PUSH_ATOMIC);
 507        args.url = transport->url;
 508
 509        if (flags & TRANSPORT_PUSH_CERT_ALWAYS)
 510                args.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 511        else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED)
 512                args.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 513        else
 514                args.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 515
 516        ret = send_pack(&args, data->fd, data->conn, remote_refs,
 517                        &data->extra_have);
 518
 519        close(data->fd[1]);
 520        close(data->fd[0]);
 521        ret |= finish_connect(data->conn);
 522        data->conn = NULL;
 523        data->got_remote_heads = 0;
 524
 525        return ret;
 526}
 527
 528static int connect_git(struct transport *transport, const char *name,
 529                       const char *executable, int fd[2])
 530{
 531        struct git_transport_data *data = transport->data;
 532        data->conn = git_connect(data->fd, transport->url,
 533                                 executable, 0);
 534        fd[0] = data->fd[0];
 535        fd[1] = data->fd[1];
 536        return 0;
 537}
 538
 539static int disconnect_git(struct transport *transport)
 540{
 541        struct git_transport_data *data = transport->data;
 542        if (data->conn) {
 543                if (data->got_remote_heads)
 544                        packet_flush(data->fd[1]);
 545                close(data->fd[0]);
 546                close(data->fd[1]);
 547                finish_connect(data->conn);
 548        }
 549
 550        free(data);
 551        return 0;
 552}
 553
 554void transport_take_over(struct transport *transport,
 555                         struct child_process *child)
 556{
 557        struct git_transport_data *data;
 558
 559        if (!transport->smart_options)
 560                die("Bug detected: Taking over transport requires non-NULL "
 561                    "smart_options field.");
 562
 563        data = xcalloc(1, sizeof(*data));
 564        data->options = *transport->smart_options;
 565        data->conn = child;
 566        data->fd[0] = data->conn->out;
 567        data->fd[1] = data->conn->in;
 568        data->got_remote_heads = 0;
 569        transport->data = data;
 570
 571        transport->set_option = NULL;
 572        transport->get_refs_list = get_refs_via_connect;
 573        transport->fetch = fetch_refs_via_pack;
 574        transport->push = NULL;
 575        transport->push_refs = git_transport_push;
 576        transport->disconnect = disconnect_git;
 577        transport->smart_options = &(data->options);
 578
 579        transport->cannot_reuse = 1;
 580}
 581
 582static int is_file(const char *url)
 583{
 584        struct stat buf;
 585        if (stat(url, &buf))
 586                return 0;
 587        return S_ISREG(buf.st_mode);
 588}
 589
 590static int external_specification_len(const char *url)
 591{
 592        return strchr(url, ':') - url;
 593}
 594
 595static const struct string_list *protocol_whitelist(void)
 596{
 597        static int enabled = -1;
 598        static struct string_list allowed = STRING_LIST_INIT_DUP;
 599
 600        if (enabled < 0) {
 601                const char *v = getenv("GIT_ALLOW_PROTOCOL");
 602                if (v) {
 603                        string_list_split(&allowed, v, ':', -1);
 604                        string_list_sort(&allowed);
 605                        enabled = 1;
 606                } else {
 607                        enabled = 0;
 608                }
 609        }
 610
 611        return enabled ? &allowed : NULL;
 612}
 613
 614int is_transport_allowed(const char *type)
 615{
 616        const struct string_list *allowed = protocol_whitelist();
 617        return !allowed || string_list_has_string(allowed, type);
 618}
 619
 620void transport_check_allowed(const char *type)
 621{
 622        if (!is_transport_allowed(type))
 623                die("transport '%s' not allowed", type);
 624}
 625
 626int transport_restrict_protocols(void)
 627{
 628        return !!protocol_whitelist();
 629}
 630
 631struct transport *transport_get(struct remote *remote, const char *url)
 632{
 633        const char *helper;
 634        struct transport *ret = xcalloc(1, sizeof(*ret));
 635
 636        ret->progress = isatty(2);
 637
 638        if (!remote)
 639                die("No remote provided to transport_get()");
 640
 641        ret->got_remote_refs = 0;
 642        ret->remote = remote;
 643        helper = remote->foreign_vcs;
 644
 645        if (!url && remote->url)
 646                url = remote->url[0];
 647        ret->url = url;
 648
 649        /* maybe it is a foreign URL? */
 650        if (url) {
 651                const char *p = url;
 652
 653                while (is_urlschemechar(p == url, *p))
 654                        p++;
 655                if (starts_with(p, "::"))
 656                        helper = xstrndup(url, p - url);
 657        }
 658
 659        if (helper) {
 660                transport_helper_init(ret, helper);
 661        } else if (starts_with(url, "rsync:")) {
 662                die("git-over-rsync is no longer supported");
 663        } else if (url_is_local_not_ssh(url) && is_file(url) && is_bundle(url, 1)) {
 664                struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 665                transport_check_allowed("file");
 666                ret->data = data;
 667                ret->get_refs_list = get_refs_from_bundle;
 668                ret->fetch = fetch_refs_from_bundle;
 669                ret->disconnect = close_bundle;
 670                ret->smart_options = NULL;
 671        } else if (!is_url(url)
 672                || starts_with(url, "file://")
 673                || starts_with(url, "git://")
 674                || starts_with(url, "ssh://")
 675                || starts_with(url, "git+ssh://")
 676                || starts_with(url, "ssh+git://")) {
 677                /*
 678                 * These are builtin smart transports; "allowed" transports
 679                 * will be checked individually in git_connect.
 680                 */
 681                struct git_transport_data *data = xcalloc(1, sizeof(*data));
 682                ret->data = data;
 683                ret->set_option = NULL;
 684                ret->get_refs_list = get_refs_via_connect;
 685                ret->fetch = fetch_refs_via_pack;
 686                ret->push_refs = git_transport_push;
 687                ret->connect = connect_git;
 688                ret->disconnect = disconnect_git;
 689                ret->smart_options = &(data->options);
 690
 691                data->conn = NULL;
 692                data->got_remote_heads = 0;
 693        } else {
 694                /* Unknown protocol in URL. Pass to external handler. */
 695                int len = external_specification_len(url);
 696                char *handler = xmemdupz(url, len);
 697                transport_helper_init(ret, handler);
 698        }
 699
 700        if (ret->smart_options) {
 701                ret->smart_options->thin = 1;
 702                ret->smart_options->uploadpack = "git-upload-pack";
 703                if (remote->uploadpack)
 704                        ret->smart_options->uploadpack = remote->uploadpack;
 705                ret->smart_options->receivepack = "git-receive-pack";
 706                if (remote->receivepack)
 707                        ret->smart_options->receivepack = remote->receivepack;
 708        }
 709
 710        return ret;
 711}
 712
 713int transport_set_option(struct transport *transport,
 714                         const char *name, const char *value)
 715{
 716        int git_reports = 1, protocol_reports = 1;
 717
 718        if (transport->smart_options)
 719                git_reports = set_git_option(transport->smart_options,
 720                                             name, value);
 721
 722        if (transport->set_option)
 723                protocol_reports = transport->set_option(transport, name,
 724                                                        value);
 725
 726        /* If either report is 0, report 0 (success). */
 727        if (!git_reports || !protocol_reports)
 728                return 0;
 729        /* If either reports -1 (invalid value), report -1. */
 730        if ((git_reports == -1) || (protocol_reports == -1))
 731                return -1;
 732        /* Otherwise if both report unknown, report unknown. */
 733        return 1;
 734}
 735
 736void transport_set_verbosity(struct transport *transport, int verbosity,
 737        int force_progress)
 738{
 739        if (verbosity >= 1)
 740                transport->verbose = verbosity <= 3 ? verbosity : 3;
 741        if (verbosity < 0)
 742                transport->verbose = -1;
 743
 744        /**
 745         * Rules used to determine whether to report progress (processing aborts
 746         * when a rule is satisfied):
 747         *
 748         *   . Report progress, if force_progress is 1 (ie. --progress).
 749         *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
 750         *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
 751         *   . Report progress if isatty(2) is 1.
 752         **/
 753        if (force_progress >= 0)
 754                transport->progress = !!force_progress;
 755        else
 756                transport->progress = verbosity >= 0 && isatty(2);
 757}
 758
 759static void die_with_unpushed_submodules(struct string_list *needs_pushing)
 760{
 761        int i;
 762
 763        fprintf(stderr, "The following submodule paths contain changes that can\n"
 764                        "not be found on any remote:\n");
 765        for (i = 0; i < needs_pushing->nr; i++)
 766                printf("  %s\n", needs_pushing->items[i].string);
 767        fprintf(stderr, "\nPlease try\n\n"
 768                        "       git push --recurse-submodules=on-demand\n\n"
 769                        "or cd to the path and use\n\n"
 770                        "       git push\n\n"
 771                        "to push them to a remote.\n\n");
 772
 773        string_list_clear(needs_pushing, 0);
 774
 775        die("Aborting.");
 776}
 777
 778static int run_pre_push_hook(struct transport *transport,
 779                             struct ref *remote_refs)
 780{
 781        int ret = 0, x;
 782        struct ref *r;
 783        struct child_process proc = CHILD_PROCESS_INIT;
 784        struct strbuf buf;
 785        const char *argv[4];
 786
 787        if (!(argv[0] = find_hook("pre-push")))
 788                return 0;
 789
 790        argv[1] = transport->remote->name;
 791        argv[2] = transport->url;
 792        argv[3] = NULL;
 793
 794        proc.argv = argv;
 795        proc.in = -1;
 796
 797        if (start_command(&proc)) {
 798                finish_command(&proc);
 799                return -1;
 800        }
 801
 802        sigchain_push(SIGPIPE, SIG_IGN);
 803
 804        strbuf_init(&buf, 256);
 805
 806        for (r = remote_refs; r; r = r->next) {
 807                if (!r->peer_ref) continue;
 808                if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
 809                if (r->status == REF_STATUS_REJECT_STALE) continue;
 810                if (r->status == REF_STATUS_UPTODATE) continue;
 811
 812                strbuf_reset(&buf);
 813                strbuf_addf( &buf, "%s %s %s %s\n",
 814                         r->peer_ref->name, oid_to_hex(&r->new_oid),
 815                         r->name, oid_to_hex(&r->old_oid));
 816
 817                if (write_in_full(proc.in, buf.buf, buf.len) < 0) {
 818                        /* We do not mind if a hook does not read all refs. */
 819                        if (errno != EPIPE)
 820                                ret = -1;
 821                        break;
 822                }
 823        }
 824
 825        strbuf_release(&buf);
 826
 827        x = close(proc.in);
 828        if (!ret)
 829                ret = x;
 830
 831        sigchain_pop(SIGPIPE);
 832
 833        x = finish_command(&proc);
 834        if (!ret)
 835                ret = x;
 836
 837        return ret;
 838}
 839
 840int transport_push(struct transport *transport,
 841                   int refspec_nr, const char **refspec, int flags,
 842                   unsigned int *reject_reasons)
 843{
 844        *reject_reasons = 0;
 845        transport_verify_remote_names(refspec_nr, refspec);
 846
 847        if (transport->push) {
 848                /* Maybe FIXME. But no important transport uses this case. */
 849                if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
 850                        die("This transport does not support using --set-upstream");
 851
 852                return transport->push(transport, refspec_nr, refspec, flags);
 853        } else if (transport->push_refs) {
 854                struct ref *remote_refs;
 855                struct ref *local_refs = get_local_heads();
 856                int match_flags = MATCH_REFS_NONE;
 857                int verbose = (transport->verbose > 0);
 858                int quiet = (transport->verbose < 0);
 859                int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
 860                int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
 861                int push_ret, ret, err;
 862
 863                if (check_push_refs(local_refs, refspec_nr, refspec) < 0)
 864                        return -1;
 865
 866                remote_refs = transport->get_refs_list(transport, 1);
 867
 868                if (flags & TRANSPORT_PUSH_ALL)
 869                        match_flags |= MATCH_REFS_ALL;
 870                if (flags & TRANSPORT_PUSH_MIRROR)
 871                        match_flags |= MATCH_REFS_MIRROR;
 872                if (flags & TRANSPORT_PUSH_PRUNE)
 873                        match_flags |= MATCH_REFS_PRUNE;
 874                if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
 875                        match_flags |= MATCH_REFS_FOLLOW_TAGS;
 876
 877                if (match_push_refs(local_refs, &remote_refs,
 878                                    refspec_nr, refspec, match_flags)) {
 879                        return -1;
 880                }
 881
 882                if (transport->smart_options &&
 883                    transport->smart_options->cas &&
 884                    !is_empty_cas(transport->smart_options->cas))
 885                        apply_push_cas(transport->smart_options->cas,
 886                                       transport->remote, remote_refs);
 887
 888                set_ref_status_for_push(remote_refs,
 889                        flags & TRANSPORT_PUSH_MIRROR,
 890                        flags & TRANSPORT_PUSH_FORCE);
 891
 892                if (!(flags & TRANSPORT_PUSH_NO_HOOK))
 893                        if (run_pre_push_hook(transport, remote_refs))
 894                                return -1;
 895
 896                if ((flags & TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND) && !is_bare_repository()) {
 897                        struct ref *ref = remote_refs;
 898                        for (; ref; ref = ref->next)
 899                                if (!is_null_oid(&ref->new_oid) &&
 900                                    !push_unpushed_submodules(ref->new_oid.hash,
 901                                            transport->remote->name))
 902                                    die ("Failed to push all needed submodules!");
 903                }
 904
 905                if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
 906                              TRANSPORT_RECURSE_SUBMODULES_CHECK)) && !is_bare_repository()) {
 907                        struct ref *ref = remote_refs;
 908                        struct string_list needs_pushing = STRING_LIST_INIT_DUP;
 909
 910                        for (; ref; ref = ref->next)
 911                                if (!is_null_oid(&ref->new_oid) &&
 912                                    find_unpushed_submodules(ref->new_oid.hash,
 913                                            transport->remote->name, &needs_pushing))
 914                                        die_with_unpushed_submodules(&needs_pushing);
 915                }
 916
 917                push_ret = transport->push_refs(transport, remote_refs, flags);
 918                err = push_had_errors(remote_refs);
 919                ret = push_ret | err;
 920
 921                if (!quiet || err)
 922                        transport_print_push_status(transport->url, remote_refs,
 923                                        verbose | porcelain, porcelain,
 924                                        reject_reasons);
 925
 926                if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
 927                        set_upstreams(transport, remote_refs, pretend);
 928
 929                if (!(flags & TRANSPORT_PUSH_DRY_RUN)) {
 930                        struct ref *ref;
 931                        for (ref = remote_refs; ref; ref = ref->next)
 932                                transport_update_tracking_ref(transport->remote, ref, verbose);
 933                }
 934
 935                if (porcelain && !push_ret)
 936                        puts("Done");
 937                else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
 938                        fprintf(stderr, "Everything up-to-date\n");
 939
 940                return ret;
 941        }
 942        return 1;
 943}
 944
 945const struct ref *transport_get_remote_refs(struct transport *transport)
 946{
 947        if (!transport->got_remote_refs) {
 948                transport->remote_refs = transport->get_refs_list(transport, 0);
 949                transport->got_remote_refs = 1;
 950        }
 951
 952        return transport->remote_refs;
 953}
 954
 955int transport_fetch_refs(struct transport *transport, struct ref *refs)
 956{
 957        int rc;
 958        int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
 959        struct ref **heads = NULL;
 960        struct ref *rm;
 961
 962        for (rm = refs; rm; rm = rm->next) {
 963                nr_refs++;
 964                if (rm->peer_ref &&
 965                    !is_null_oid(&rm->old_oid) &&
 966                    !oidcmp(&rm->peer_ref->old_oid, &rm->old_oid))
 967                        continue;
 968                ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
 969                heads[nr_heads++] = rm;
 970        }
 971
 972        if (!nr_heads) {
 973                /*
 974                 * When deepening of a shallow repository is requested,
 975                 * then local and remote refs are likely to still be equal.
 976                 * Just feed them all to the fetch method in that case.
 977                 * This condition shouldn't be met in a non-deepening fetch
 978                 * (see builtin/fetch.c:quickfetch()).
 979                 */
 980                heads = xmalloc(nr_refs * sizeof(*heads));
 981                for (rm = refs; rm; rm = rm->next)
 982                        heads[nr_heads++] = rm;
 983        }
 984
 985        rc = transport->fetch(transport, nr_heads, heads);
 986
 987        free(heads);
 988        return rc;
 989}
 990
 991void transport_unlock_pack(struct transport *transport)
 992{
 993        if (transport->pack_lockfile) {
 994                unlink_or_warn(transport->pack_lockfile);
 995                free(transport->pack_lockfile);
 996                transport->pack_lockfile = NULL;
 997        }
 998}
 999
1000int transport_connect(struct transport *transport, const char *name,
1001                      const char *exec, int fd[2])
1002{
1003        if (transport->connect)
1004                return transport->connect(transport, name, exec, fd);
1005        else
1006                die("Operation not supported by protocol");
1007}
1008
1009int transport_disconnect(struct transport *transport)
1010{
1011        int ret = 0;
1012        if (transport->disconnect)
1013                ret = transport->disconnect(transport);
1014        free(transport);
1015        return ret;
1016}
1017
1018/*
1019 * Strip username (and password) from a URL and return
1020 * it in a newly allocated string.
1021 */
1022char *transport_anonymize_url(const char *url)
1023{
1024        char *anon_url, *scheme_prefix, *anon_part;
1025        size_t anon_len, prefix_len = 0;
1026
1027        anon_part = strchr(url, '@');
1028        if (url_is_local_not_ssh(url) || !anon_part)
1029                goto literal_copy;
1030
1031        anon_len = strlen(++anon_part);
1032        scheme_prefix = strstr(url, "://");
1033        if (!scheme_prefix) {
1034                if (!strchr(anon_part, ':'))
1035                        /* cannot be "me@there:/path/name" */
1036                        goto literal_copy;
1037        } else {
1038                const char *cp;
1039                /* make sure scheme is reasonable */
1040                for (cp = url; cp < scheme_prefix; cp++) {
1041                        switch (*cp) {
1042                                /* RFC 1738 2.1 */
1043                        case '+': case '.': case '-':
1044                                break; /* ok */
1045                        default:
1046                                if (isalnum(*cp))
1047                                        break;
1048                                /* it isn't */
1049                                goto literal_copy;
1050                        }
1051                }
1052                /* @ past the first slash does not count */
1053                cp = strchr(scheme_prefix + 3, '/');
1054                if (cp && cp < anon_part)
1055                        goto literal_copy;
1056                prefix_len = scheme_prefix - url + 3;
1057        }
1058        anon_url = xcalloc(1, 1 + prefix_len + anon_len);
1059        memcpy(anon_url, url, prefix_len);
1060        memcpy(anon_url + prefix_len, anon_part, anon_len);
1061        return anon_url;
1062literal_copy:
1063        return xstrdup(url);
1064}
1065
1066struct alternate_refs_data {
1067        alternate_ref_fn *fn;
1068        void *data;
1069};
1070
1071static int refs_from_alternate_cb(struct alternate_object_database *e,
1072                                  void *data)
1073{
1074        char *other;
1075        size_t len;
1076        struct remote *remote;
1077        struct transport *transport;
1078        const struct ref *extra;
1079        struct alternate_refs_data *cb = data;
1080
1081        e->name[-1] = '\0';
1082        other = xstrdup(real_path(e->base));
1083        e->name[-1] = '/';
1084        len = strlen(other);
1085
1086        while (other[len-1] == '/')
1087                other[--len] = '\0';
1088        if (len < 8 || memcmp(other + len - 8, "/objects", 8))
1089                goto out;
1090        /* Is this a git repository with refs? */
1091        memcpy(other + len - 8, "/refs", 6);
1092        if (!is_directory(other))
1093                goto out;
1094        other[len - 8] = '\0';
1095        remote = remote_get(other);
1096        transport = transport_get(remote, other);
1097        for (extra = transport_get_remote_refs(transport);
1098             extra;
1099             extra = extra->next)
1100                cb->fn(extra, cb->data);
1101        transport_disconnect(transport);
1102out:
1103        free(other);
1104        return 0;
1105}
1106
1107void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1108{
1109        struct alternate_refs_data cb;
1110        cb.fn = fn;
1111        cb.data = data;
1112        foreach_alt_odb(refs_from_alternate_cb, &cb);
1113}