Andrew's git / gitweb.git / transport.c
?
transport.con commit Merge branch 'lw/daemon-log-destination' (f9bcd75)
   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 "branch.h"
  15#include "url.h"
  16#include "submodule.h"
  17#include "string-list.h"
  18#include "sha1-array.h"
  19#include "sigchain.h"
  20#include "transport-internal.h"
  21#include "object-store.h"
  22
  23static void set_upstreams(struct transport *transport, struct ref *refs,
  24        int pretend)
  25{
  26        struct ref *ref;
  27        for (ref = refs; ref; ref = ref->next) {
  28                const char *localname;
  29                const char *tmp;
  30                const char *remotename;
  31                int flag = 0;
  32                /*
  33                 * Check suitability for tracking. Must be successful /
  34                 * already up-to-date ref create/modify (not delete).
  35                 */
  36                if (ref->status != REF_STATUS_OK &&
  37                        ref->status != REF_STATUS_UPTODATE)
  38                        continue;
  39                if (!ref->peer_ref)
  40                        continue;
  41                if (is_null_oid(&ref->new_oid))
  42                        continue;
  43
  44                /* Follow symbolic refs (mainly for HEAD). */
  45                localname = ref->peer_ref->name;
  46                remotename = ref->name;
  47                tmp = resolve_ref_unsafe(localname, RESOLVE_REF_READING,
  48                                         NULL, &flag);
  49                if (tmp && flag & REF_ISSYMREF &&
  50                        starts_with(tmp, "refs/heads/"))
  51                        localname = tmp;
  52
  53                /* Both source and destination must be local branches. */
  54                if (!localname || !starts_with(localname, "refs/heads/"))
  55                        continue;
  56                if (!remotename || !starts_with(remotename, "refs/heads/"))
  57                        continue;
  58
  59                if (!pretend)
  60                        install_branch_config(BRANCH_CONFIG_VERBOSE,
  61                                localname + 11, transport->remote->name,
  62                                remotename);
  63                else
  64                        printf(_("Would set upstream of '%s' to '%s' of '%s'\n"),
  65                                localname + 11, remotename + 11,
  66                                transport->remote->name);
  67        }
  68}
  69
  70struct bundle_transport_data {
  71        int fd;
  72        struct bundle_header header;
  73};
  74
  75static struct ref *get_refs_from_bundle(struct transport *transport, int for_push)
  76{
  77        struct bundle_transport_data *data = transport->data;
  78        struct ref *result = NULL;
  79        int i;
  80
  81        if (for_push)
  82                return NULL;
  83
  84        if (data->fd > 0)
  85                close(data->fd);
  86        data->fd = read_bundle_header(transport->url, &data->header);
  87        if (data->fd < 0)
  88                die ("Could not read bundle '%s'.", transport->url);
  89        for (i = 0; i < data->header.references.nr; i++) {
  90                struct ref_list_entry *e = data->header.references.list + i;
  91                struct ref *ref = alloc_ref(e->name);
  92                oidcpy(&ref->old_oid, &e->oid);
  93                ref->next = result;
  94                result = ref;
  95        }
  96        return result;
  97}
  98
  99static int fetch_refs_from_bundle(struct transport *transport,
 100                               int nr_heads, struct ref **to_fetch)
 101{
 102        struct bundle_transport_data *data = transport->data;
 103        return unbundle(&data->header, data->fd,
 104                        transport->progress ? BUNDLE_VERBOSE : 0);
 105}
 106
 107static int close_bundle(struct transport *transport)
 108{
 109        struct bundle_transport_data *data = transport->data;
 110        if (data->fd > 0)
 111                close(data->fd);
 112        free(data);
 113        return 0;
 114}
 115
 116struct git_transport_data {
 117        struct git_transport_options options;
 118        struct child_process *conn;
 119        int fd[2];
 120        unsigned got_remote_heads : 1;
 121        struct oid_array extra_have;
 122        struct oid_array shallow;
 123};
 124
 125static int set_git_option(struct git_transport_options *opts,
 126                          const char *name, const char *value)
 127{
 128        if (!strcmp(name, TRANS_OPT_UPLOADPACK)) {
 129                opts->uploadpack = value;
 130                return 0;
 131        } else if (!strcmp(name, TRANS_OPT_RECEIVEPACK)) {
 132                opts->receivepack = value;
 133                return 0;
 134        } else if (!strcmp(name, TRANS_OPT_THIN)) {
 135                opts->thin = !!value;
 136                return 0;
 137        } else if (!strcmp(name, TRANS_OPT_FOLLOWTAGS)) {
 138                opts->followtags = !!value;
 139                return 0;
 140        } else if (!strcmp(name, TRANS_OPT_KEEP)) {
 141                opts->keep = !!value;
 142                return 0;
 143        } else if (!strcmp(name, TRANS_OPT_UPDATE_SHALLOW)) {
 144                opts->update_shallow = !!value;
 145                return 0;
 146        } else if (!strcmp(name, TRANS_OPT_DEPTH)) {
 147                if (!value)
 148                        opts->depth = 0;
 149                else {
 150                        char *end;
 151                        opts->depth = strtol(value, &end, 0);
 152                        if (*end)
 153                                die(_("transport: invalid depth option '%s'"), value);
 154                }
 155                return 0;
 156        } else if (!strcmp(name, TRANS_OPT_DEEPEN_SINCE)) {
 157                opts->deepen_since = value;
 158                return 0;
 159        } else if (!strcmp(name, TRANS_OPT_DEEPEN_NOT)) {
 160                opts->deepen_not = (const struct string_list *)value;
 161                return 0;
 162        } else if (!strcmp(name, TRANS_OPT_DEEPEN_RELATIVE)) {
 163                opts->deepen_relative = !!value;
 164                return 0;
 165        } else if (!strcmp(name, TRANS_OPT_FROM_PROMISOR)) {
 166                opts->from_promisor = !!value;
 167                return 0;
 168        } else if (!strcmp(name, TRANS_OPT_NO_DEPENDENTS)) {
 169                opts->no_dependents = !!value;
 170                return 0;
 171        } else if (!strcmp(name, TRANS_OPT_LIST_OBJECTS_FILTER)) {
 172                parse_list_objects_filter(&opts->filter_options, value);
 173                return 0;
 174        }
 175        return 1;
 176}
 177
 178static int connect_setup(struct transport *transport, int for_push)
 179{
 180        struct git_transport_data *data = transport->data;
 181        int flags = transport->verbose > 0 ? CONNECT_VERBOSE : 0;
 182
 183        if (data->conn)
 184                return 0;
 185
 186        switch (transport->family) {
 187        case TRANSPORT_FAMILY_ALL: break;
 188        case TRANSPORT_FAMILY_IPV4: flags |= CONNECT_IPV4; break;
 189        case TRANSPORT_FAMILY_IPV6: flags |= CONNECT_IPV6; break;
 190        }
 191
 192        data->conn = git_connect(data->fd, transport->url,
 193                                 for_push ? data->options.receivepack :
 194                                 data->options.uploadpack,
 195                                 flags);
 196
 197        return 0;
 198}
 199
 200static struct ref *get_refs_via_connect(struct transport *transport, int for_push)
 201{
 202        struct git_transport_data *data = transport->data;
 203        struct ref *refs;
 204
 205        connect_setup(transport, for_push);
 206        get_remote_heads(data->fd[0], NULL, 0, &refs,
 207                         for_push ? REF_NORMAL : 0,
 208                         &data->extra_have,
 209                         &data->shallow);
 210        data->got_remote_heads = 1;
 211
 212        return refs;
 213}
 214
 215static int fetch_refs_via_pack(struct transport *transport,
 216                               int nr_heads, struct ref **to_fetch)
 217{
 218        int ret = 0;
 219        struct git_transport_data *data = transport->data;
 220        struct ref *refs;
 221        char *dest = xstrdup(transport->url);
 222        struct fetch_pack_args args;
 223        struct ref *refs_tmp = NULL;
 224
 225        memset(&args, 0, sizeof(args));
 226        args.uploadpack = data->options.uploadpack;
 227        args.keep_pack = data->options.keep;
 228        args.lock_pack = 1;
 229        args.use_thin_pack = data->options.thin;
 230        args.include_tag = data->options.followtags;
 231        args.verbose = (transport->verbose > 1);
 232        args.quiet = (transport->verbose < 0);
 233        args.no_progress = !transport->progress;
 234        args.depth = data->options.depth;
 235        args.deepen_since = data->options.deepen_since;
 236        args.deepen_not = data->options.deepen_not;
 237        args.deepen_relative = data->options.deepen_relative;
 238        args.check_self_contained_and_connected =
 239                data->options.check_self_contained_and_connected;
 240        args.cloning = transport->cloning;
 241        args.update_shallow = data->options.update_shallow;
 242        args.from_promisor = data->options.from_promisor;
 243        args.no_dependents = data->options.no_dependents;
 244        args.filter_options = data->options.filter_options;
 245
 246        if (!data->got_remote_heads) {
 247                connect_setup(transport, 0);
 248                get_remote_heads(data->fd[0], NULL, 0, &refs_tmp, 0,
 249                                 NULL, &data->shallow);
 250                data->got_remote_heads = 1;
 251        }
 252
 253        refs = fetch_pack(&args, data->fd, data->conn,
 254                          refs_tmp ? refs_tmp : transport->remote_refs,
 255                          dest, to_fetch, nr_heads, &data->shallow,
 256                          &transport->pack_lockfile);
 257        close(data->fd[0]);
 258        close(data->fd[1]);
 259        if (finish_connect(data->conn))
 260                ret = -1;
 261        data->conn = NULL;
 262        data->got_remote_heads = 0;
 263        data->options.self_contained_and_connected =
 264                args.self_contained_and_connected;
 265
 266        if (refs == NULL)
 267                ret = -1;
 268        if (report_unmatched_refs(to_fetch, nr_heads))
 269                ret = -1;
 270
 271        free_refs(refs_tmp);
 272        free_refs(refs);
 273        free(dest);
 274        return ret;
 275}
 276
 277static int push_had_errors(struct ref *ref)
 278{
 279        for (; ref; ref = ref->next) {
 280                switch (ref->status) {
 281                case REF_STATUS_NONE:
 282                case REF_STATUS_UPTODATE:
 283                case REF_STATUS_OK:
 284                        break;
 285                default:
 286                        return 1;
 287                }
 288        }
 289        return 0;
 290}
 291
 292int transport_refs_pushed(struct ref *ref)
 293{
 294        for (; ref; ref = ref->next) {
 295                switch(ref->status) {
 296                case REF_STATUS_NONE:
 297                case REF_STATUS_UPTODATE:
 298                        break;
 299                default:
 300                        return 1;
 301                }
 302        }
 303        return 0;
 304}
 305
 306void transport_update_tracking_ref(struct remote *remote, struct ref *ref, int verbose)
 307{
 308        struct refspec rs;
 309
 310        if (ref->status != REF_STATUS_OK && ref->status != REF_STATUS_UPTODATE)
 311                return;
 312
 313        rs.src = ref->name;
 314        rs.dst = NULL;
 315
 316        if (!remote_find_tracking(remote, &rs)) {
 317                if (verbose)
 318                        fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
 319                if (ref->deletion) {
 320                        delete_ref(NULL, rs.dst, NULL, 0);
 321                } else
 322                        update_ref("update by push", rs.dst, &ref->new_oid,
 323                                   NULL, 0, 0);
 324                free(rs.dst);
 325        }
 326}
 327
 328static void print_ref_status(char flag, const char *summary,
 329                             struct ref *to, struct ref *from, const char *msg,
 330                             int porcelain, int summary_width)
 331{
 332        if (porcelain) {
 333                if (from)
 334                        fprintf(stdout, "%c\t%s:%s\t", flag, from->name, to->name);
 335                else
 336                        fprintf(stdout, "%c\t:%s\t", flag, to->name);
 337                if (msg)
 338                        fprintf(stdout, "%s (%s)\n", summary, msg);
 339                else
 340                        fprintf(stdout, "%s\n", summary);
 341        } else {
 342                fprintf(stderr, " %c %-*s ", flag, summary_width, summary);
 343                if (from)
 344                        fprintf(stderr, "%s -> %s", prettify_refname(from->name), prettify_refname(to->name));
 345                else
 346                        fputs(prettify_refname(to->name), stderr);
 347                if (msg) {
 348                        fputs(" (", stderr);
 349                        fputs(msg, stderr);
 350                        fputc(')', stderr);
 351                }
 352                fputc('\n', stderr);
 353        }
 354}
 355
 356static void print_ok_ref_status(struct ref *ref, int porcelain, int summary_width)
 357{
 358        if (ref->deletion)
 359                print_ref_status('-', "[deleted]", ref, NULL, NULL,
 360                                 porcelain, summary_width);
 361        else if (is_null_oid(&ref->old_oid))
 362                print_ref_status('*',
 363                        (starts_with(ref->name, "refs/tags/") ? "[new tag]" :
 364                        "[new branch]"),
 365                        ref, ref->peer_ref, NULL, porcelain, summary_width);
 366        else {
 367                struct strbuf quickref = STRBUF_INIT;
 368                char type;
 369                const char *msg;
 370
 371                strbuf_add_unique_abbrev(&quickref, &ref->old_oid,
 372                                         DEFAULT_ABBREV);
 373                if (ref->forced_update) {
 374                        strbuf_addstr(&quickref, "...");
 375                        type = '+';
 376                        msg = "forced update";
 377                } else {
 378                        strbuf_addstr(&quickref, "..");
 379                        type = ' ';
 380                        msg = NULL;
 381                }
 382                strbuf_add_unique_abbrev(&quickref, &ref->new_oid,
 383                                         DEFAULT_ABBREV);
 384
 385                print_ref_status(type, quickref.buf, ref, ref->peer_ref, msg,
 386                                 porcelain, summary_width);
 387                strbuf_release(&quickref);
 388        }
 389}
 390
 391static int print_one_push_status(struct ref *ref, const char *dest, int count,
 392                                 int porcelain, int summary_width)
 393{
 394        if (!count) {
 395                char *url = transport_anonymize_url(dest);
 396                fprintf(porcelain ? stdout : stderr, "To %s\n", url);
 397                free(url);
 398        }
 399
 400        switch(ref->status) {
 401        case REF_STATUS_NONE:
 402                print_ref_status('X', "[no match]", ref, NULL, NULL,
 403                                 porcelain, summary_width);
 404                break;
 405        case REF_STATUS_REJECT_NODELETE:
 406                print_ref_status('!', "[rejected]", ref, NULL,
 407                                 "remote does not support deleting refs",
 408                                 porcelain, summary_width);
 409                break;
 410        case REF_STATUS_UPTODATE:
 411                print_ref_status('=', "[up to date]", ref,
 412                                 ref->peer_ref, NULL, porcelain, summary_width);
 413                break;
 414        case REF_STATUS_REJECT_NONFASTFORWARD:
 415                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 416                                 "non-fast-forward", porcelain, summary_width);
 417                break;
 418        case REF_STATUS_REJECT_ALREADY_EXISTS:
 419                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 420                                 "already exists", porcelain, summary_width);
 421                break;
 422        case REF_STATUS_REJECT_FETCH_FIRST:
 423                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 424                                 "fetch first", porcelain, summary_width);
 425                break;
 426        case REF_STATUS_REJECT_NEEDS_FORCE:
 427                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 428                                 "needs force", porcelain, summary_width);
 429                break;
 430        case REF_STATUS_REJECT_STALE:
 431                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 432                                 "stale info", porcelain, summary_width);
 433                break;
 434        case REF_STATUS_REJECT_SHALLOW:
 435                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 436                                 "new shallow roots not allowed",
 437                                 porcelain, summary_width);
 438                break;
 439        case REF_STATUS_REMOTE_REJECT:
 440                print_ref_status('!', "[remote rejected]", ref,
 441                                 ref->deletion ? NULL : ref->peer_ref,
 442                                 ref->remote_status, porcelain, summary_width);
 443                break;
 444        case REF_STATUS_EXPECTING_REPORT:
 445                print_ref_status('!', "[remote failure]", ref,
 446                                 ref->deletion ? NULL : ref->peer_ref,
 447                                 "remote failed to report status",
 448                                 porcelain, summary_width);
 449                break;
 450        case REF_STATUS_ATOMIC_PUSH_FAILED:
 451                print_ref_status('!', "[rejected]", ref, ref->peer_ref,
 452                                 "atomic push failed", porcelain, summary_width);
 453                break;
 454        case REF_STATUS_OK:
 455                print_ok_ref_status(ref, porcelain, summary_width);
 456                break;
 457        }
 458
 459        return 1;
 460}
 461
 462static int measure_abbrev(const struct object_id *oid, int sofar)
 463{
 464        char hex[GIT_MAX_HEXSZ + 1];
 465        int w = find_unique_abbrev_r(hex, oid, DEFAULT_ABBREV);
 466
 467        return (w < sofar) ? sofar : w;
 468}
 469
 470int transport_summary_width(const struct ref *refs)
 471{
 472        int maxw = -1;
 473
 474        for (; refs; refs = refs->next) {
 475                maxw = measure_abbrev(&refs->old_oid, maxw);
 476                maxw = measure_abbrev(&refs->new_oid, maxw);
 477        }
 478        if (maxw < 0)
 479                maxw = FALLBACK_DEFAULT_ABBREV;
 480        return (2 * maxw + 3);
 481}
 482
 483void transport_print_push_status(const char *dest, struct ref *refs,
 484                                  int verbose, int porcelain, unsigned int *reject_reasons)
 485{
 486        struct ref *ref;
 487        int n = 0;
 488        char *head;
 489        int summary_width = transport_summary_width(refs);
 490
 491        head = resolve_refdup("HEAD", RESOLVE_REF_READING, NULL, NULL);
 492
 493        if (verbose) {
 494                for (ref = refs; ref; ref = ref->next)
 495                        if (ref->status == REF_STATUS_UPTODATE)
 496                                n += print_one_push_status(ref, dest, n,
 497                                                           porcelain, summary_width);
 498        }
 499
 500        for (ref = refs; ref; ref = ref->next)
 501                if (ref->status == REF_STATUS_OK)
 502                        n += print_one_push_status(ref, dest, n,
 503                                                   porcelain, summary_width);
 504
 505        *reject_reasons = 0;
 506        for (ref = refs; ref; ref = ref->next) {
 507                if (ref->status != REF_STATUS_NONE &&
 508                    ref->status != REF_STATUS_UPTODATE &&
 509                    ref->status != REF_STATUS_OK)
 510                        n += print_one_push_status(ref, dest, n,
 511                                                   porcelain, summary_width);
 512                if (ref->status == REF_STATUS_REJECT_NONFASTFORWARD) {
 513                        if (head != NULL && !strcmp(head, ref->name))
 514                                *reject_reasons |= REJECT_NON_FF_HEAD;
 515                        else
 516                                *reject_reasons |= REJECT_NON_FF_OTHER;
 517                } else if (ref->status == REF_STATUS_REJECT_ALREADY_EXISTS) {
 518                        *reject_reasons |= REJECT_ALREADY_EXISTS;
 519                } else if (ref->status == REF_STATUS_REJECT_FETCH_FIRST) {
 520                        *reject_reasons |= REJECT_FETCH_FIRST;
 521                } else if (ref->status == REF_STATUS_REJECT_NEEDS_FORCE) {
 522                        *reject_reasons |= REJECT_NEEDS_FORCE;
 523                }
 524        }
 525        free(head);
 526}
 527
 528void transport_verify_remote_names(int nr_heads, const char **heads)
 529{
 530        int i;
 531
 532        for (i = 0; i < nr_heads; i++) {
 533                const char *local = heads[i];
 534                const char *remote = strrchr(heads[i], ':');
 535
 536                if (*local == '+')
 537                        local++;
 538
 539                /* A matching refspec is okay.  */
 540                if (remote == local && remote[1] == '\0')
 541                        continue;
 542
 543                remote = remote ? (remote + 1) : local;
 544                if (check_refname_format(remote,
 545                                REFNAME_ALLOW_ONELEVEL|REFNAME_REFSPEC_PATTERN))
 546                        die("remote part of refspec is not a valid name in %s",
 547                                heads[i]);
 548        }
 549}
 550
 551static int git_transport_push(struct transport *transport, struct ref *remote_refs, int flags)
 552{
 553        struct git_transport_data *data = transport->data;
 554        struct send_pack_args args;
 555        int ret;
 556
 557        if (!data->got_remote_heads) {
 558                struct ref *tmp_refs;
 559                connect_setup(transport, 1);
 560
 561                get_remote_heads(data->fd[0], NULL, 0, &tmp_refs, REF_NORMAL,
 562                                 NULL, &data->shallow);
 563                data->got_remote_heads = 1;
 564        }
 565
 566        memset(&args, 0, sizeof(args));
 567        args.send_mirror = !!(flags & TRANSPORT_PUSH_MIRROR);
 568        args.force_update = !!(flags & TRANSPORT_PUSH_FORCE);
 569        args.use_thin_pack = data->options.thin;
 570        args.verbose = (transport->verbose > 0);
 571        args.quiet = (transport->verbose < 0);
 572        args.progress = transport->progress;
 573        args.dry_run = !!(flags & TRANSPORT_PUSH_DRY_RUN);
 574        args.porcelain = !!(flags & TRANSPORT_PUSH_PORCELAIN);
 575        args.atomic = !!(flags & TRANSPORT_PUSH_ATOMIC);
 576        args.push_options = transport->push_options;
 577        args.url = transport->url;
 578
 579        if (flags & TRANSPORT_PUSH_CERT_ALWAYS)
 580                args.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 581        else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED)
 582                args.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 583        else
 584                args.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 585
 586        ret = send_pack(&args, data->fd, data->conn, remote_refs,
 587                        &data->extra_have);
 588
 589        close(data->fd[1]);
 590        close(data->fd[0]);
 591        ret |= finish_connect(data->conn);
 592        data->conn = NULL;
 593        data->got_remote_heads = 0;
 594
 595        return ret;
 596}
 597
 598static int connect_git(struct transport *transport, const char *name,
 599                       const char *executable, int fd[2])
 600{
 601        struct git_transport_data *data = transport->data;
 602        data->conn = git_connect(data->fd, transport->url,
 603                                 executable, 0);
 604        fd[0] = data->fd[0];
 605        fd[1] = data->fd[1];
 606        return 0;
 607}
 608
 609static int disconnect_git(struct transport *transport)
 610{
 611        struct git_transport_data *data = transport->data;
 612        if (data->conn) {
 613                if (data->got_remote_heads)
 614                        packet_flush(data->fd[1]);
 615                close(data->fd[0]);
 616                close(data->fd[1]);
 617                finish_connect(data->conn);
 618        }
 619
 620        free(data);
 621        return 0;
 622}
 623
 624static struct transport_vtable taken_over_vtable = {
 625        NULL,
 626        get_refs_via_connect,
 627        fetch_refs_via_pack,
 628        git_transport_push,
 629        NULL,
 630        disconnect_git
 631};
 632
 633void transport_take_over(struct transport *transport,
 634                         struct child_process *child)
 635{
 636        struct git_transport_data *data;
 637
 638        if (!transport->smart_options)
 639                die("BUG: taking over transport requires non-NULL "
 640                    "smart_options field.");
 641
 642        data = xcalloc(1, sizeof(*data));
 643        data->options = *transport->smart_options;
 644        data->conn = child;
 645        data->fd[0] = data->conn->out;
 646        data->fd[1] = data->conn->in;
 647        data->got_remote_heads = 0;
 648        transport->data = data;
 649
 650        transport->vtable = &taken_over_vtable;
 651        transport->smart_options = &(data->options);
 652
 653        transport->cannot_reuse = 1;
 654}
 655
 656static int is_file(const char *url)
 657{
 658        struct stat buf;
 659        if (stat(url, &buf))
 660                return 0;
 661        return S_ISREG(buf.st_mode);
 662}
 663
 664static int external_specification_len(const char *url)
 665{
 666        return strchr(url, ':') - url;
 667}
 668
 669static const struct string_list *protocol_whitelist(void)
 670{
 671        static int enabled = -1;
 672        static struct string_list allowed = STRING_LIST_INIT_DUP;
 673
 674        if (enabled < 0) {
 675                const char *v = getenv("GIT_ALLOW_PROTOCOL");
 676                if (v) {
 677                        string_list_split(&allowed, v, ':', -1);
 678                        string_list_sort(&allowed);
 679                        enabled = 1;
 680                } else {
 681                        enabled = 0;
 682                }
 683        }
 684
 685        return enabled ? &allowed : NULL;
 686}
 687
 688enum protocol_allow_config {
 689        PROTOCOL_ALLOW_NEVER = 0,
 690        PROTOCOL_ALLOW_USER_ONLY,
 691        PROTOCOL_ALLOW_ALWAYS
 692};
 693
 694static enum protocol_allow_config parse_protocol_config(const char *key,
 695                                                        const char *value)
 696{
 697        if (!strcasecmp(value, "always"))
 698                return PROTOCOL_ALLOW_ALWAYS;
 699        else if (!strcasecmp(value, "never"))
 700                return PROTOCOL_ALLOW_NEVER;
 701        else if (!strcasecmp(value, "user"))
 702                return PROTOCOL_ALLOW_USER_ONLY;
 703
 704        die("unknown value for config '%s': %s", key, value);
 705}
 706
 707static enum protocol_allow_config get_protocol_config(const char *type)
 708{
 709        char *key = xstrfmt("protocol.%s.allow", type);
 710        char *value;
 711
 712        /* first check the per-protocol config */
 713        if (!git_config_get_string(key, &value)) {
 714                enum protocol_allow_config ret =
 715                        parse_protocol_config(key, value);
 716                free(key);
 717                free(value);
 718                return ret;
 719        }
 720        free(key);
 721
 722        /* if defined, fallback to user-defined default for unknown protocols */
 723        if (!git_config_get_string("protocol.allow", &value)) {
 724                enum protocol_allow_config ret =
 725                        parse_protocol_config("protocol.allow", value);
 726                free(value);
 727                return ret;
 728        }
 729
 730        /* fallback to built-in defaults */
 731        /* known safe */
 732        if (!strcmp(type, "http") ||
 733            !strcmp(type, "https") ||
 734            !strcmp(type, "git") ||
 735            !strcmp(type, "ssh") ||
 736            !strcmp(type, "file"))
 737                return PROTOCOL_ALLOW_ALWAYS;
 738
 739        /* known scary; err on the side of caution */
 740        if (!strcmp(type, "ext"))
 741                return PROTOCOL_ALLOW_NEVER;
 742
 743        /* unknown; by default let them be used only directly by the user */
 744        return PROTOCOL_ALLOW_USER_ONLY;
 745}
 746
 747int is_transport_allowed(const char *type, int from_user)
 748{
 749        const struct string_list *whitelist = protocol_whitelist();
 750        if (whitelist)
 751                return string_list_has_string(whitelist, type);
 752
 753        switch (get_protocol_config(type)) {
 754        case PROTOCOL_ALLOW_ALWAYS:
 755                return 1;
 756        case PROTOCOL_ALLOW_NEVER:
 757                return 0;
 758        case PROTOCOL_ALLOW_USER_ONLY:
 759                if (from_user < 0)
 760                        from_user = git_env_bool("GIT_PROTOCOL_FROM_USER", 1);
 761                return from_user;
 762        }
 763
 764        die("BUG: invalid protocol_allow_config type");
 765}
 766
 767void transport_check_allowed(const char *type)
 768{
 769        if (!is_transport_allowed(type, -1))
 770                die("transport '%s' not allowed", type);
 771}
 772
 773static struct transport_vtable bundle_vtable = {
 774        NULL,
 775        get_refs_from_bundle,
 776        fetch_refs_from_bundle,
 777        NULL,
 778        NULL,
 779        close_bundle
 780};
 781
 782static struct transport_vtable builtin_smart_vtable = {
 783        NULL,
 784        get_refs_via_connect,
 785        fetch_refs_via_pack,
 786        git_transport_push,
 787        connect_git,
 788        disconnect_git
 789};
 790
 791struct transport *transport_get(struct remote *remote, const char *url)
 792{
 793        const char *helper;
 794        struct transport *ret = xcalloc(1, sizeof(*ret));
 795
 796        ret->progress = isatty(2);
 797
 798        if (!remote)
 799                die("No remote provided to transport_get()");
 800
 801        ret->got_remote_refs = 0;
 802        ret->remote = remote;
 803        helper = remote->foreign_vcs;
 804
 805        if (!url && remote->url)
 806                url = remote->url[0];
 807        ret->url = url;
 808
 809        /* maybe it is a foreign URL? */
 810        if (url) {
 811                const char *p = url;
 812
 813                while (is_urlschemechar(p == url, *p))
 814                        p++;
 815                if (starts_with(p, "::"))
 816                        helper = xstrndup(url, p - url);
 817        }
 818
 819        if (helper) {
 820                transport_helper_init(ret, helper);
 821        } else if (starts_with(url, "rsync:")) {
 822                die("git-over-rsync is no longer supported");
 823        } else if (url_is_local_not_ssh(url) && is_file(url) && is_bundle(url, 1)) {
 824                struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
 825                transport_check_allowed("file");
 826                ret->data = data;
 827                ret->vtable = &bundle_vtable;
 828                ret->smart_options = NULL;
 829        } else if (!is_url(url)
 830                || starts_with(url, "file://")
 831                || starts_with(url, "git://")
 832                || starts_with(url, "ssh://")
 833                || starts_with(url, "git+ssh://") /* deprecated - do not use */
 834                || starts_with(url, "ssh+git://") /* deprecated - do not use */
 835                ) {
 836                /*
 837                 * These are builtin smart transports; "allowed" transports
 838                 * will be checked individually in git_connect.
 839                 */
 840                struct git_transport_data *data = xcalloc(1, sizeof(*data));
 841                ret->data = data;
 842                ret->vtable = &builtin_smart_vtable;
 843                ret->smart_options = &(data->options);
 844
 845                data->conn = NULL;
 846                data->got_remote_heads = 0;
 847        } else {
 848                /* Unknown protocol in URL. Pass to external handler. */
 849                int len = external_specification_len(url);
 850                char *handler = xmemdupz(url, len);
 851                transport_helper_init(ret, handler);
 852        }
 853
 854        if (ret->smart_options) {
 855                ret->smart_options->thin = 1;
 856                ret->smart_options->uploadpack = "git-upload-pack";
 857                if (remote->uploadpack)
 858                        ret->smart_options->uploadpack = remote->uploadpack;
 859                ret->smart_options->receivepack = "git-receive-pack";
 860                if (remote->receivepack)
 861                        ret->smart_options->receivepack = remote->receivepack;
 862        }
 863
 864        return ret;
 865}
 866
 867int transport_set_option(struct transport *transport,
 868                         const char *name, const char *value)
 869{
 870        int git_reports = 1, protocol_reports = 1;
 871
 872        if (transport->smart_options)
 873                git_reports = set_git_option(transport->smart_options,
 874                                             name, value);
 875
 876        if (transport->vtable->set_option)
 877                protocol_reports = transport->vtable->set_option(transport,
 878                                                                 name, value);
 879
 880        /* If either report is 0, report 0 (success). */
 881        if (!git_reports || !protocol_reports)
 882                return 0;
 883        /* If either reports -1 (invalid value), report -1. */
 884        if ((git_reports == -1) || (protocol_reports == -1))
 885                return -1;
 886        /* Otherwise if both report unknown, report unknown. */
 887        return 1;
 888}
 889
 890void transport_set_verbosity(struct transport *transport, int verbosity,
 891        int force_progress)
 892{
 893        if (verbosity >= 1)
 894                transport->verbose = verbosity <= 3 ? verbosity : 3;
 895        if (verbosity < 0)
 896                transport->verbose = -1;
 897
 898        /**
 899         * Rules used to determine whether to report progress (processing aborts
 900         * when a rule is satisfied):
 901         *
 902         *   . Report progress, if force_progress is 1 (ie. --progress).
 903         *   . Don't report progress, if force_progress is 0 (ie. --no-progress).
 904         *   . Don't report progress, if verbosity < 0 (ie. -q/--quiet ).
 905         *   . Report progress if isatty(2) is 1.
 906         **/
 907        if (force_progress >= 0)
 908                transport->progress = !!force_progress;
 909        else
 910                transport->progress = verbosity >= 0 && isatty(2);
 911}
 912
 913static void die_with_unpushed_submodules(struct string_list *needs_pushing)
 914{
 915        int i;
 916
 917        fprintf(stderr, _("The following submodule paths contain changes that can\n"
 918                        "not be found on any remote:\n"));
 919        for (i = 0; i < needs_pushing->nr; i++)
 920                fprintf(stderr, "  %s\n", needs_pushing->items[i].string);
 921        fprintf(stderr, _("\nPlease try\n\n"
 922                          "     git push --recurse-submodules=on-demand\n\n"
 923                          "or cd to the path and use\n\n"
 924                          "     git push\n\n"
 925                          "to push them to a remote.\n\n"));
 926
 927        string_list_clear(needs_pushing, 0);
 928
 929        die(_("Aborting."));
 930}
 931
 932static int run_pre_push_hook(struct transport *transport,
 933                             struct ref *remote_refs)
 934{
 935        int ret = 0, x;
 936        struct ref *r;
 937        struct child_process proc = CHILD_PROCESS_INIT;
 938        struct strbuf buf;
 939        const char *argv[4];
 940
 941        if (!(argv[0] = find_hook("pre-push")))
 942                return 0;
 943
 944        argv[1] = transport->remote->name;
 945        argv[2] = transport->url;
 946        argv[3] = NULL;
 947
 948        proc.argv = argv;
 949        proc.in = -1;
 950
 951        if (start_command(&proc)) {
 952                finish_command(&proc);
 953                return -1;
 954        }
 955
 956        sigchain_push(SIGPIPE, SIG_IGN);
 957
 958        strbuf_init(&buf, 256);
 959
 960        for (r = remote_refs; r; r = r->next) {
 961                if (!r->peer_ref) continue;
 962                if (r->status == REF_STATUS_REJECT_NONFASTFORWARD) continue;
 963                if (r->status == REF_STATUS_REJECT_STALE) continue;
 964                if (r->status == REF_STATUS_UPTODATE) continue;
 965
 966                strbuf_reset(&buf);
 967                strbuf_addf( &buf, "%s %s %s %s\n",
 968                         r->peer_ref->name, oid_to_hex(&r->new_oid),
 969                         r->name, oid_to_hex(&r->old_oid));
 970
 971                if (write_in_full(proc.in, buf.buf, buf.len) < 0) {
 972                        /* We do not mind if a hook does not read all refs. */
 973                        if (errno != EPIPE)
 974                                ret = -1;
 975                        break;
 976                }
 977        }
 978
 979        strbuf_release(&buf);
 980
 981        x = close(proc.in);
 982        if (!ret)
 983                ret = x;
 984
 985        sigchain_pop(SIGPIPE);
 986
 987        x = finish_command(&proc);
 988        if (!ret)
 989                ret = x;
 990
 991        return ret;
 992}
 993
 994int transport_push(struct transport *transport,
 995                   int refspec_nr, const char **refspec, int flags,
 996                   unsigned int *reject_reasons)
 997{
 998        *reject_reasons = 0;
 999        transport_verify_remote_names(refspec_nr, refspec);
1000
1001        if (transport->vtable->push_refs) {
1002                struct ref *remote_refs;
1003                struct ref *local_refs = get_local_heads();
1004                int match_flags = MATCH_REFS_NONE;
1005                int verbose = (transport->verbose > 0);
1006                int quiet = (transport->verbose < 0);
1007                int porcelain = flags & TRANSPORT_PUSH_PORCELAIN;
1008                int pretend = flags & TRANSPORT_PUSH_DRY_RUN;
1009                int push_ret, ret, err;
1010
1011                if (check_push_refs(local_refs, refspec_nr, refspec) < 0)
1012                        return -1;
1013
1014                remote_refs = transport->vtable->get_refs_list(transport, 1);
1015
1016                if (flags & TRANSPORT_PUSH_ALL)
1017                        match_flags |= MATCH_REFS_ALL;
1018                if (flags & TRANSPORT_PUSH_MIRROR)
1019                        match_flags |= MATCH_REFS_MIRROR;
1020                if (flags & TRANSPORT_PUSH_PRUNE)
1021                        match_flags |= MATCH_REFS_PRUNE;
1022                if (flags & TRANSPORT_PUSH_FOLLOW_TAGS)
1023                        match_flags |= MATCH_REFS_FOLLOW_TAGS;
1024
1025                if (match_push_refs(local_refs, &remote_refs,
1026                                    refspec_nr, refspec, match_flags)) {
1027                        return -1;
1028                }
1029
1030                if (transport->smart_options &&
1031                    transport->smart_options->cas &&
1032                    !is_empty_cas(transport->smart_options->cas))
1033                        apply_push_cas(transport->smart_options->cas,
1034                                       transport->remote, remote_refs);
1035
1036                set_ref_status_for_push(remote_refs,
1037                        flags & TRANSPORT_PUSH_MIRROR,
1038                        flags & TRANSPORT_PUSH_FORCE);
1039
1040                if (!(flags & TRANSPORT_PUSH_NO_HOOK))
1041                        if (run_pre_push_hook(transport, remote_refs))
1042                                return -1;
1043
1044                if ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1045                              TRANSPORT_RECURSE_SUBMODULES_ONLY)) &&
1046                    !is_bare_repository()) {
1047                        struct ref *ref = remote_refs;
1048                        struct oid_array commits = OID_ARRAY_INIT;
1049
1050                        for (; ref; ref = ref->next)
1051                                if (!is_null_oid(&ref->new_oid))
1052                                        oid_array_append(&commits,
1053                                                          &ref->new_oid);
1054
1055                        if (!push_unpushed_submodules(&commits,
1056                                                      transport->remote,
1057                                                      refspec, refspec_nr,
1058                                                      transport->push_options,
1059                                                      pretend)) {
1060                                oid_array_clear(&commits);
1061                                die("Failed to push all needed submodules!");
1062                        }
1063                        oid_array_clear(&commits);
1064                }
1065
1066                if (((flags & TRANSPORT_RECURSE_SUBMODULES_CHECK) ||
1067                     ((flags & (TRANSPORT_RECURSE_SUBMODULES_ON_DEMAND |
1068                                TRANSPORT_RECURSE_SUBMODULES_ONLY)) &&
1069                      !pretend)) && !is_bare_repository()) {
1070                        struct ref *ref = remote_refs;
1071                        struct string_list needs_pushing = STRING_LIST_INIT_DUP;
1072                        struct oid_array commits = OID_ARRAY_INIT;
1073
1074                        for (; ref; ref = ref->next)
1075                                if (!is_null_oid(&ref->new_oid))
1076                                        oid_array_append(&commits,
1077                                                          &ref->new_oid);
1078
1079                        if (find_unpushed_submodules(&commits, transport->remote->name,
1080                                                &needs_pushing)) {
1081                                oid_array_clear(&commits);
1082                                die_with_unpushed_submodules(&needs_pushing);
1083                        }
1084                        string_list_clear(&needs_pushing, 0);
1085                        oid_array_clear(&commits);
1086                }
1087
1088                if (!(flags & TRANSPORT_RECURSE_SUBMODULES_ONLY))
1089                        push_ret = transport->vtable->push_refs(transport, remote_refs, flags);
1090                else
1091                        push_ret = 0;
1092                err = push_had_errors(remote_refs);
1093                ret = push_ret | err;
1094
1095                if (!quiet || err)
1096                        transport_print_push_status(transport->url, remote_refs,
1097                                        verbose | porcelain, porcelain,
1098                                        reject_reasons);
1099
1100                if (flags & TRANSPORT_PUSH_SET_UPSTREAM)
1101                        set_upstreams(transport, remote_refs, pretend);
1102
1103                if (!(flags & (TRANSPORT_PUSH_DRY_RUN |
1104                               TRANSPORT_RECURSE_SUBMODULES_ONLY))) {
1105                        struct ref *ref;
1106                        for (ref = remote_refs; ref; ref = ref->next)
1107                                transport_update_tracking_ref(transport->remote, ref, verbose);
1108                }
1109
1110                if (porcelain && !push_ret)
1111                        puts("Done");
1112                else if (!quiet && !ret && !transport_refs_pushed(remote_refs))
1113                        fprintf(stderr, "Everything up-to-date\n");
1114
1115                return ret;
1116        }
1117        return 1;
1118}
1119
1120const struct ref *transport_get_remote_refs(struct transport *transport)
1121{
1122        if (!transport->got_remote_refs) {
1123                transport->remote_refs = transport->vtable->get_refs_list(transport, 0);
1124                transport->got_remote_refs = 1;
1125        }
1126
1127        return transport->remote_refs;
1128}
1129
1130int transport_fetch_refs(struct transport *transport, struct ref *refs)
1131{
1132        int rc;
1133        int nr_heads = 0, nr_alloc = 0, nr_refs = 0;
1134        struct ref **heads = NULL;
1135        struct ref *rm;
1136
1137        for (rm = refs; rm; rm = rm->next) {
1138                nr_refs++;
1139                if (rm->peer_ref &&
1140                    !is_null_oid(&rm->old_oid) &&
1141                    !oidcmp(&rm->peer_ref->old_oid, &rm->old_oid))
1142                        continue;
1143                ALLOC_GROW(heads, nr_heads + 1, nr_alloc);
1144                heads[nr_heads++] = rm;
1145        }
1146
1147        if (!nr_heads) {
1148                /*
1149                 * When deepening of a shallow repository is requested,
1150                 * then local and remote refs are likely to still be equal.
1151                 * Just feed them all to the fetch method in that case.
1152                 * This condition shouldn't be met in a non-deepening fetch
1153                 * (see builtin/fetch.c:quickfetch()).
1154                 */
1155                ALLOC_ARRAY(heads, nr_refs);
1156                for (rm = refs; rm; rm = rm->next)
1157                        heads[nr_heads++] = rm;
1158        }
1159
1160        rc = transport->vtable->fetch(transport, nr_heads, heads);
1161
1162        free(heads);
1163        return rc;
1164}
1165
1166void transport_unlock_pack(struct transport *transport)
1167{
1168        if (transport->pack_lockfile) {
1169                unlink_or_warn(transport->pack_lockfile);
1170                FREE_AND_NULL(transport->pack_lockfile);
1171        }
1172}
1173
1174int transport_connect(struct transport *transport, const char *name,
1175                      const char *exec, int fd[2])
1176{
1177        if (transport->vtable->connect)
1178                return transport->vtable->connect(transport, name, exec, fd);
1179        else
1180                die("Operation not supported by protocol");
1181}
1182
1183int transport_disconnect(struct transport *transport)
1184{
1185        int ret = 0;
1186        if (transport->vtable->disconnect)
1187                ret = transport->vtable->disconnect(transport);
1188        free(transport);
1189        return ret;
1190}
1191
1192/*
1193 * Strip username (and password) from a URL and return
1194 * it in a newly allocated string.
1195 */
1196char *transport_anonymize_url(const char *url)
1197{
1198        char *scheme_prefix, *anon_part;
1199        size_t anon_len, prefix_len = 0;
1200
1201        anon_part = strchr(url, '@');
1202        if (url_is_local_not_ssh(url) || !anon_part)
1203                goto literal_copy;
1204
1205        anon_len = strlen(++anon_part);
1206        scheme_prefix = strstr(url, "://");
1207        if (!scheme_prefix) {
1208                if (!strchr(anon_part, ':'))
1209                        /* cannot be "me@there:/path/name" */
1210                        goto literal_copy;
1211        } else {
1212                const char *cp;
1213                /* make sure scheme is reasonable */
1214                for (cp = url; cp < scheme_prefix; cp++) {
1215                        switch (*cp) {
1216                                /* RFC 1738 2.1 */
1217                        case '+': case '.': case '-':
1218                                break; /* ok */
1219                        default:
1220                                if (isalnum(*cp))
1221                                        break;
1222                                /* it isn't */
1223                                goto literal_copy;
1224                        }
1225                }
1226                /* @ past the first slash does not count */
1227                cp = strchr(scheme_prefix + 3, '/');
1228                if (cp && cp < anon_part)
1229                        goto literal_copy;
1230                prefix_len = scheme_prefix - url + 3;
1231        }
1232        return xstrfmt("%.*s%.*s", (int)prefix_len, url,
1233                       (int)anon_len, anon_part);
1234literal_copy:
1235        return xstrdup(url);
1236}
1237
1238static void read_alternate_refs(const char *path,
1239                                alternate_ref_fn *cb,
1240                                void *data)
1241{
1242        struct child_process cmd = CHILD_PROCESS_INIT;
1243        struct strbuf line = STRBUF_INIT;
1244        FILE *fh;
1245
1246        cmd.git_cmd = 1;
1247        argv_array_pushf(&cmd.args, "--git-dir=%s", path);
1248        argv_array_push(&cmd.args, "for-each-ref");
1249        argv_array_push(&cmd.args, "--format=%(objectname) %(refname)");
1250        cmd.env = local_repo_env;
1251        cmd.out = -1;
1252
1253        if (start_command(&cmd))
1254                return;
1255
1256        fh = xfdopen(cmd.out, "r");
1257        while (strbuf_getline_lf(&line, fh) != EOF) {
1258                struct object_id oid;
1259
1260                if (get_oid_hex(line.buf, &oid) ||
1261                    line.buf[GIT_SHA1_HEXSZ] != ' ') {
1262                        warning("invalid line while parsing alternate refs: %s",
1263                                line.buf);
1264                        break;
1265                }
1266
1267                cb(line.buf + GIT_SHA1_HEXSZ + 1, &oid, data);
1268        }
1269
1270        fclose(fh);
1271        finish_command(&cmd);
1272}
1273
1274struct alternate_refs_data {
1275        alternate_ref_fn *fn;
1276        void *data;
1277};
1278
1279static int refs_from_alternate_cb(struct alternate_object_database *e,
1280                                  void *data)
1281{
1282        struct strbuf path = STRBUF_INIT;
1283        size_t base_len;
1284        struct alternate_refs_data *cb = data;
1285
1286        if (!strbuf_realpath(&path, e->path, 0))
1287                goto out;
1288        if (!strbuf_strip_suffix(&path, "/objects"))
1289                goto out;
1290        base_len = path.len;
1291
1292        /* Is this a git repository with refs? */
1293        strbuf_addstr(&path, "/refs");
1294        if (!is_directory(path.buf))
1295                goto out;
1296        strbuf_setlen(&path, base_len);
1297
1298        read_alternate_refs(path.buf, cb->fn, cb->data);
1299
1300out:
1301        strbuf_release(&path);
1302        return 0;
1303}
1304
1305void for_each_alternate_ref(alternate_ref_fn fn, void *data)
1306{
1307        struct alternate_refs_data cb;
1308        cb.fn = fn;
1309        cb.data = data;
1310        foreach_alt_odb(refs_from_alternate_cb, &cb);
1311}