transport-helper.con commit Merge branch 'ks/t7508-indent-fix' (6968ca9)
   1#include "cache.h"
   2#include "transport.h"
   3#include "quote.h"
   4#include "run-command.h"
   5#include "commit.h"
   6#include "diff.h"
   7#include "revision.h"
   8#include "remote.h"
   9#include "string-list.h"
  10#include "thread-utils.h"
  11#include "sigchain.h"
  12#include "argv-array.h"
  13#include "refs.h"
  14
  15static int debug;
  16
  17struct helper_data {
  18        const char *name;
  19        struct child_process *helper;
  20        FILE *out;
  21        unsigned fetch : 1,
  22                import : 1,
  23                bidi_import : 1,
  24                export : 1,
  25                option : 1,
  26                push : 1,
  27                connect : 1,
  28                signed_tags : 1,
  29                check_connectivity : 1,
  30                no_disconnect_req : 1,
  31                no_private_update : 1;
  32        char *export_marks;
  33        char *import_marks;
  34        /* These go from remote name (as in "list") to private name */
  35        struct refspec *refspecs;
  36        int refspec_nr;
  37        /* Transport options for fetch-pack/send-pack (should one of
  38         * those be invoked).
  39         */
  40        struct git_transport_options transport_options;
  41};
  42
  43static void sendline(struct helper_data *helper, struct strbuf *buffer)
  44{
  45        if (debug)
  46                fprintf(stderr, "Debug: Remote helper: -> %s", buffer->buf);
  47        if (write_in_full(helper->helper->in, buffer->buf, buffer->len)
  48                != buffer->len)
  49                die_errno("Full write to remote helper failed");
  50}
  51
  52static int recvline_fh(FILE *helper, struct strbuf *buffer, const char *name)
  53{
  54        strbuf_reset(buffer);
  55        if (debug)
  56                fprintf(stderr, "Debug: Remote helper: Waiting...\n");
  57        if (strbuf_getline(buffer, helper) == EOF) {
  58                if (debug)
  59                        fprintf(stderr, "Debug: Remote helper quit.\n");
  60                return 1;
  61        }
  62
  63        if (debug)
  64                fprintf(stderr, "Debug: Remote helper: <- %s\n", buffer->buf);
  65        return 0;
  66}
  67
  68static int recvline(struct helper_data *helper, struct strbuf *buffer)
  69{
  70        return recvline_fh(helper->out, buffer, helper->name);
  71}
  72
  73static void write_constant(int fd, const char *str)
  74{
  75        if (debug)
  76                fprintf(stderr, "Debug: Remote helper: -> %s", str);
  77        if (write_in_full(fd, str, strlen(str)) != strlen(str))
  78                die_errno("Full write to remote helper failed");
  79}
  80
  81static const char *remove_ext_force(const char *url)
  82{
  83        if (url) {
  84                const char *colon = strchr(url, ':');
  85                if (colon && colon[1] == ':')
  86                        return colon + 2;
  87        }
  88        return url;
  89}
  90
  91static void do_take_over(struct transport *transport)
  92{
  93        struct helper_data *data;
  94        data = (struct helper_data *)transport->data;
  95        transport_take_over(transport, data->helper);
  96        fclose(data->out);
  97        free(data);
  98}
  99
 100static void standard_options(struct transport *t);
 101
 102static struct child_process *get_helper(struct transport *transport)
 103{
 104        struct helper_data *data = transport->data;
 105        struct strbuf buf = STRBUF_INIT;
 106        struct child_process *helper;
 107        const char **refspecs = NULL;
 108        int refspec_nr = 0;
 109        int refspec_alloc = 0;
 110        int duped;
 111        int code;
 112
 113        if (data->helper)
 114                return data->helper;
 115
 116        helper = xmalloc(sizeof(*helper));
 117        child_process_init(helper);
 118        helper->in = -1;
 119        helper->out = -1;
 120        helper->err = 0;
 121        argv_array_pushf(&helper->args, "git-remote-%s", data->name);
 122        argv_array_push(&helper->args, transport->remote->name);
 123        argv_array_push(&helper->args, remove_ext_force(transport->url));
 124        helper->git_cmd = 0;
 125        helper->silent_exec_failure = 1;
 126
 127        if (have_git_dir())
 128                argv_array_pushf(&helper->env_array, "%s=%s",
 129                                 GIT_DIR_ENVIRONMENT, get_git_dir());
 130
 131        code = start_command(helper);
 132        if (code < 0 && errno == ENOENT)
 133                die("Unable to find remote helper for '%s'", data->name);
 134        else if (code != 0)
 135                exit(code);
 136
 137        data->helper = helper;
 138        data->no_disconnect_req = 0;
 139
 140        /*
 141         * Open the output as FILE* so strbuf_getline_*() family of
 142         * functions can be used.
 143         * Do this with duped fd because fclose() will close the fd,
 144         * and stuff like taking over will require the fd to remain.
 145         */
 146        duped = dup(helper->out);
 147        if (duped < 0)
 148                die_errno("Can't dup helper output fd");
 149        data->out = xfdopen(duped, "r");
 150
 151        write_constant(helper->in, "capabilities\n");
 152
 153        while (1) {
 154                const char *capname, *arg;
 155                int mandatory = 0;
 156                if (recvline(data, &buf))
 157                        exit(128);
 158
 159                if (!*buf.buf)
 160                        break;
 161
 162                if (*buf.buf == '*') {
 163                        capname = buf.buf + 1;
 164                        mandatory = 1;
 165                } else
 166                        capname = buf.buf;
 167
 168                if (debug)
 169                        fprintf(stderr, "Debug: Got cap %s\n", capname);
 170                if (!strcmp(capname, "fetch"))
 171                        data->fetch = 1;
 172                else if (!strcmp(capname, "option"))
 173                        data->option = 1;
 174                else if (!strcmp(capname, "push"))
 175                        data->push = 1;
 176                else if (!strcmp(capname, "import"))
 177                        data->import = 1;
 178                else if (!strcmp(capname, "bidi-import"))
 179                        data->bidi_import = 1;
 180                else if (!strcmp(capname, "export"))
 181                        data->export = 1;
 182                else if (!strcmp(capname, "check-connectivity"))
 183                        data->check_connectivity = 1;
 184                else if (!data->refspecs && skip_prefix(capname, "refspec ", &arg)) {
 185                        ALLOC_GROW(refspecs,
 186                                   refspec_nr + 1,
 187                                   refspec_alloc);
 188                        refspecs[refspec_nr++] = xstrdup(arg);
 189                } else if (!strcmp(capname, "connect")) {
 190                        data->connect = 1;
 191                } else if (!strcmp(capname, "signed-tags")) {
 192                        data->signed_tags = 1;
 193                } else if (skip_prefix(capname, "export-marks ", &arg)) {
 194                        data->export_marks = xstrdup(arg);
 195                } else if (skip_prefix(capname, "import-marks ", &arg)) {
 196                        data->import_marks = xstrdup(arg);
 197                } else if (starts_with(capname, "no-private-update")) {
 198                        data->no_private_update = 1;
 199                } else if (mandatory) {
 200                        die("Unknown mandatory capability %s. This remote "
 201                            "helper probably needs newer version of Git.",
 202                            capname);
 203                }
 204        }
 205        if (refspecs) {
 206                int i;
 207                data->refspec_nr = refspec_nr;
 208                data->refspecs = parse_fetch_refspec(refspec_nr, refspecs);
 209                for (i = 0; i < refspec_nr; i++)
 210                        free((char *)refspecs[i]);
 211                free(refspecs);
 212        } else if (data->import || data->bidi_import || data->export) {
 213                warning("This remote helper should implement refspec capability.");
 214        }
 215        strbuf_release(&buf);
 216        if (debug)
 217                fprintf(stderr, "Debug: Capabilities complete.\n");
 218        standard_options(transport);
 219        return data->helper;
 220}
 221
 222static int disconnect_helper(struct transport *transport)
 223{
 224        struct helper_data *data = transport->data;
 225        int res = 0;
 226
 227        if (data->helper) {
 228                if (debug)
 229                        fprintf(stderr, "Debug: Disconnecting.\n");
 230                if (!data->no_disconnect_req) {
 231                        /*
 232                         * Ignore write errors; there's nothing we can do,
 233                         * since we're about to close the pipe anyway. And the
 234                         * most likely error is EPIPE due to the helper dying
 235                         * to report an error itself.
 236                         */
 237                        sigchain_push(SIGPIPE, SIG_IGN);
 238                        xwrite(data->helper->in, "\n", 1);
 239                        sigchain_pop(SIGPIPE);
 240                }
 241                close(data->helper->in);
 242                close(data->helper->out);
 243                fclose(data->out);
 244                res = finish_command(data->helper);
 245                FREE_AND_NULL(data->helper);
 246        }
 247        return res;
 248}
 249
 250static const char *unsupported_options[] = {
 251        TRANS_OPT_UPLOADPACK,
 252        TRANS_OPT_RECEIVEPACK,
 253        TRANS_OPT_THIN,
 254        TRANS_OPT_KEEP
 255        };
 256
 257static const char *boolean_options[] = {
 258        TRANS_OPT_THIN,
 259        TRANS_OPT_KEEP,
 260        TRANS_OPT_FOLLOWTAGS,
 261        TRANS_OPT_DEEPEN_RELATIVE
 262        };
 263
 264static int strbuf_set_helper_option(struct helper_data *data,
 265                                    struct strbuf *buf)
 266{
 267        int ret;
 268
 269        sendline(data, buf);
 270        if (recvline(data, buf))
 271                exit(128);
 272
 273        if (!strcmp(buf->buf, "ok"))
 274                ret = 0;
 275        else if (starts_with(buf->buf, "error"))
 276                ret = -1;
 277        else if (!strcmp(buf->buf, "unsupported"))
 278                ret = 1;
 279        else {
 280                warning("%s unexpectedly said: '%s'", data->name, buf->buf);
 281                ret = 1;
 282        }
 283        return ret;
 284}
 285
 286static int string_list_set_helper_option(struct helper_data *data,
 287                                         const char *name,
 288                                         struct string_list *list)
 289{
 290        struct strbuf buf = STRBUF_INIT;
 291        int i, ret = 0;
 292
 293        for (i = 0; i < list->nr; i++) {
 294                strbuf_addf(&buf, "option %s ", name);
 295                quote_c_style(list->items[i].string, &buf, NULL, 0);
 296                strbuf_addch(&buf, '\n');
 297
 298                if ((ret = strbuf_set_helper_option(data, &buf)))
 299                        break;
 300                strbuf_reset(&buf);
 301        }
 302        strbuf_release(&buf);
 303        return ret;
 304}
 305
 306static int set_helper_option(struct transport *transport,
 307                          const char *name, const char *value)
 308{
 309        struct helper_data *data = transport->data;
 310        struct strbuf buf = STRBUF_INIT;
 311        int i, ret, is_bool = 0;
 312
 313        get_helper(transport);
 314
 315        if (!data->option)
 316                return 1;
 317
 318        if (!strcmp(name, "deepen-not"))
 319                return string_list_set_helper_option(data, name,
 320                                                     (struct string_list *)value);
 321
 322        for (i = 0; i < ARRAY_SIZE(unsupported_options); i++) {
 323                if (!strcmp(name, unsupported_options[i]))
 324                        return 1;
 325        }
 326
 327        for (i = 0; i < ARRAY_SIZE(boolean_options); i++) {
 328                if (!strcmp(name, boolean_options[i])) {
 329                        is_bool = 1;
 330                        break;
 331                }
 332        }
 333
 334        strbuf_addf(&buf, "option %s ", name);
 335        if (is_bool)
 336                strbuf_addstr(&buf, value ? "true" : "false");
 337        else
 338                quote_c_style(value, &buf, NULL, 0);
 339        strbuf_addch(&buf, '\n');
 340
 341        ret = strbuf_set_helper_option(data, &buf);
 342        strbuf_release(&buf);
 343        return ret;
 344}
 345
 346static void standard_options(struct transport *t)
 347{
 348        char buf[16];
 349        int v = t->verbose;
 350
 351        set_helper_option(t, "progress", t->progress ? "true" : "false");
 352
 353        xsnprintf(buf, sizeof(buf), "%d", v + 1);
 354        set_helper_option(t, "verbosity", buf);
 355
 356        switch (t->family) {
 357        case TRANSPORT_FAMILY_ALL:
 358                /*
 359                 * this is already the default,
 360                 * do not break old remote helpers by setting "all" here
 361                 */
 362                break;
 363        case TRANSPORT_FAMILY_IPV4:
 364                set_helper_option(t, "family", "ipv4");
 365                break;
 366        case TRANSPORT_FAMILY_IPV6:
 367                set_helper_option(t, "family", "ipv6");
 368                break;
 369        }
 370}
 371
 372static int release_helper(struct transport *transport)
 373{
 374        int res = 0;
 375        struct helper_data *data = transport->data;
 376        free_refspec(data->refspec_nr, data->refspecs);
 377        data->refspecs = NULL;
 378        res = disconnect_helper(transport);
 379        free(transport->data);
 380        return res;
 381}
 382
 383static int fetch_with_fetch(struct transport *transport,
 384                            int nr_heads, struct ref **to_fetch)
 385{
 386        struct helper_data *data = transport->data;
 387        int i;
 388        struct strbuf buf = STRBUF_INIT;
 389
 390        for (i = 0; i < nr_heads; i++) {
 391                const struct ref *posn = to_fetch[i];
 392                if (posn->status & REF_STATUS_UPTODATE)
 393                        continue;
 394
 395                strbuf_addf(&buf, "fetch %s %s\n",
 396                            oid_to_hex(&posn->old_oid),
 397                            posn->symref ? posn->symref : posn->name);
 398        }
 399
 400        strbuf_addch(&buf, '\n');
 401        sendline(data, &buf);
 402
 403        while (1) {
 404                if (recvline(data, &buf))
 405                        exit(128);
 406
 407                if (starts_with(buf.buf, "lock ")) {
 408                        const char *name = buf.buf + 5;
 409                        if (transport->pack_lockfile)
 410                                warning("%s also locked %s", data->name, name);
 411                        else
 412                                transport->pack_lockfile = xstrdup(name);
 413                }
 414                else if (data->check_connectivity &&
 415                         data->transport_options.check_self_contained_and_connected &&
 416                         !strcmp(buf.buf, "connectivity-ok"))
 417                        data->transport_options.self_contained_and_connected = 1;
 418                else if (!buf.len)
 419                        break;
 420                else
 421                        warning("%s unexpectedly said: '%s'", data->name, buf.buf);
 422        }
 423        strbuf_release(&buf);
 424        return 0;
 425}
 426
 427static int get_importer(struct transport *transport, struct child_process *fastimport)
 428{
 429        struct child_process *helper = get_helper(transport);
 430        struct helper_data *data = transport->data;
 431        int cat_blob_fd, code;
 432        child_process_init(fastimport);
 433        fastimport->in = helper->out;
 434        argv_array_push(&fastimport->args, "fast-import");
 435        argv_array_push(&fastimport->args, debug ? "--stats" : "--quiet");
 436
 437        if (data->bidi_import) {
 438                cat_blob_fd = xdup(helper->in);
 439                argv_array_pushf(&fastimport->args, "--cat-blob-fd=%d", cat_blob_fd);
 440        }
 441        fastimport->git_cmd = 1;
 442
 443        code = start_command(fastimport);
 444        return code;
 445}
 446
 447static int get_exporter(struct transport *transport,
 448                        struct child_process *fastexport,
 449                        struct string_list *revlist_args)
 450{
 451        struct helper_data *data = transport->data;
 452        struct child_process *helper = get_helper(transport);
 453        int i;
 454
 455        child_process_init(fastexport);
 456
 457        /* we need to duplicate helper->in because we want to use it after
 458         * fastexport is done with it. */
 459        fastexport->out = dup(helper->in);
 460        argv_array_push(&fastexport->args, "fast-export");
 461        argv_array_push(&fastexport->args, "--use-done-feature");
 462        argv_array_push(&fastexport->args, data->signed_tags ?
 463                "--signed-tags=verbatim" : "--signed-tags=warn-strip");
 464        if (data->export_marks)
 465                argv_array_pushf(&fastexport->args, "--export-marks=%s.tmp", data->export_marks);
 466        if (data->import_marks)
 467                argv_array_pushf(&fastexport->args, "--import-marks=%s", data->import_marks);
 468
 469        for (i = 0; i < revlist_args->nr; i++)
 470                argv_array_push(&fastexport->args, revlist_args->items[i].string);
 471
 472        fastexport->git_cmd = 1;
 473        return start_command(fastexport);
 474}
 475
 476static int fetch_with_import(struct transport *transport,
 477                             int nr_heads, struct ref **to_fetch)
 478{
 479        struct child_process fastimport;
 480        struct helper_data *data = transport->data;
 481        int i;
 482        struct ref *posn;
 483        struct strbuf buf = STRBUF_INIT;
 484
 485        get_helper(transport);
 486
 487        if (get_importer(transport, &fastimport))
 488                die("Couldn't run fast-import");
 489
 490        for (i = 0; i < nr_heads; i++) {
 491                posn = to_fetch[i];
 492                if (posn->status & REF_STATUS_UPTODATE)
 493                        continue;
 494
 495                strbuf_addf(&buf, "import %s\n",
 496                            posn->symref ? posn->symref : posn->name);
 497                sendline(data, &buf);
 498                strbuf_reset(&buf);
 499        }
 500
 501        write_constant(data->helper->in, "\n");
 502        /*
 503         * remote-helpers that advertise the bidi-import capability are required to
 504         * buffer the complete batch of import commands until this newline before
 505         * sending data to fast-import.
 506         * These helpers read back data from fast-import on their stdin, which could
 507         * be mixed with import commands, otherwise.
 508         */
 509
 510        if (finish_command(&fastimport))
 511                die("Error while running fast-import");
 512
 513        /*
 514         * The fast-import stream of a remote helper that advertises
 515         * the "refspec" capability writes to the refs named after the
 516         * right hand side of the first refspec matching each ref we
 517         * were fetching.
 518         *
 519         * (If no "refspec" capability was specified, for historical
 520         * reasons we default to the equivalent of *:*.)
 521         *
 522         * Store the result in to_fetch[i].old_sha1.  Callers such
 523         * as "git fetch" can use the value to write feedback to the
 524         * terminal, populate FETCH_HEAD, and determine what new value
 525         * should be written to peer_ref if the update is a
 526         * fast-forward or this is a forced update.
 527         */
 528        for (i = 0; i < nr_heads; i++) {
 529                char *private, *name;
 530                posn = to_fetch[i];
 531                if (posn->status & REF_STATUS_UPTODATE)
 532                        continue;
 533                name = posn->symref ? posn->symref : posn->name;
 534                if (data->refspecs)
 535                        private = apply_refspecs(data->refspecs, data->refspec_nr, name);
 536                else
 537                        private = xstrdup(name);
 538                if (private) {
 539                        if (read_ref(private, posn->old_oid.hash) < 0)
 540                                die("Could not read ref %s", private);
 541                        free(private);
 542                }
 543        }
 544        strbuf_release(&buf);
 545        return 0;
 546}
 547
 548static int process_connect_service(struct transport *transport,
 549                                   const char *name, const char *exec)
 550{
 551        struct helper_data *data = transport->data;
 552        struct strbuf cmdbuf = STRBUF_INIT;
 553        struct child_process *helper;
 554        int r, duped, ret = 0;
 555        FILE *input;
 556
 557        helper = get_helper(transport);
 558
 559        /*
 560         * Yes, dup the pipe another time, as we need unbuffered version
 561         * of input pipe as FILE*. fclose() closes the underlying fd and
 562         * stream buffering only can be changed before first I/O operation
 563         * on it.
 564         */
 565        duped = dup(helper->out);
 566        if (duped < 0)
 567                die_errno("Can't dup helper output fd");
 568        input = xfdopen(duped, "r");
 569        setvbuf(input, NULL, _IONBF, 0);
 570
 571        /*
 572         * Handle --upload-pack and friends. This is fire and forget...
 573         * just warn if it fails.
 574         */
 575        if (strcmp(name, exec)) {
 576                r = set_helper_option(transport, "servpath", exec);
 577                if (r > 0)
 578                        warning("Setting remote service path not supported by protocol.");
 579                else if (r < 0)
 580                        warning("Invalid remote service path.");
 581        }
 582
 583        if (data->connect)
 584                strbuf_addf(&cmdbuf, "connect %s\n", name);
 585        else
 586                goto exit;
 587
 588        sendline(data, &cmdbuf);
 589        if (recvline_fh(input, &cmdbuf, name))
 590                exit(128);
 591
 592        if (!strcmp(cmdbuf.buf, "")) {
 593                data->no_disconnect_req = 1;
 594                if (debug)
 595                        fprintf(stderr, "Debug: Smart transport connection "
 596                                "ready.\n");
 597                ret = 1;
 598        } else if (!strcmp(cmdbuf.buf, "fallback")) {
 599                if (debug)
 600                        fprintf(stderr, "Debug: Falling back to dumb "
 601                                "transport.\n");
 602        } else
 603                die("Unknown response to connect: %s",
 604                        cmdbuf.buf);
 605
 606exit:
 607        fclose(input);
 608        return ret;
 609}
 610
 611static int process_connect(struct transport *transport,
 612                                     int for_push)
 613{
 614        struct helper_data *data = transport->data;
 615        const char *name;
 616        const char *exec;
 617
 618        name = for_push ? "git-receive-pack" : "git-upload-pack";
 619        if (for_push)
 620                exec = data->transport_options.receivepack;
 621        else
 622                exec = data->transport_options.uploadpack;
 623
 624        return process_connect_service(transport, name, exec);
 625}
 626
 627static int connect_helper(struct transport *transport, const char *name,
 628                   const char *exec, int fd[2])
 629{
 630        struct helper_data *data = transport->data;
 631
 632        /* Get_helper so connect is inited. */
 633        get_helper(transport);
 634        if (!data->connect)
 635                die("Operation not supported by protocol.");
 636
 637        if (!process_connect_service(transport, name, exec))
 638                die("Can't connect to subservice %s.", name);
 639
 640        fd[0] = data->helper->out;
 641        fd[1] = data->helper->in;
 642        return 0;
 643}
 644
 645static int fetch(struct transport *transport,
 646                 int nr_heads, struct ref **to_fetch)
 647{
 648        struct helper_data *data = transport->data;
 649        int i, count;
 650
 651        if (process_connect(transport, 0)) {
 652                do_take_over(transport);
 653                return transport->fetch(transport, nr_heads, to_fetch);
 654        }
 655
 656        count = 0;
 657        for (i = 0; i < nr_heads; i++)
 658                if (!(to_fetch[i]->status & REF_STATUS_UPTODATE))
 659                        count++;
 660
 661        if (!count)
 662                return 0;
 663
 664        if (data->check_connectivity &&
 665            data->transport_options.check_self_contained_and_connected)
 666                set_helper_option(transport, "check-connectivity", "true");
 667
 668        if (transport->cloning)
 669                set_helper_option(transport, "cloning", "true");
 670
 671        if (data->transport_options.update_shallow)
 672                set_helper_option(transport, "update-shallow", "true");
 673
 674        if (data->fetch)
 675                return fetch_with_fetch(transport, nr_heads, to_fetch);
 676
 677        if (data->import)
 678                return fetch_with_import(transport, nr_heads, to_fetch);
 679
 680        return -1;
 681}
 682
 683static int push_update_ref_status(struct strbuf *buf,
 684                                   struct ref **ref,
 685                                   struct ref *remote_refs)
 686{
 687        char *refname, *msg;
 688        int status, forced = 0;
 689
 690        if (starts_with(buf->buf, "ok ")) {
 691                status = REF_STATUS_OK;
 692                refname = buf->buf + 3;
 693        } else if (starts_with(buf->buf, "error ")) {
 694                status = REF_STATUS_REMOTE_REJECT;
 695                refname = buf->buf + 6;
 696        } else
 697                die("expected ok/error, helper said '%s'", buf->buf);
 698
 699        msg = strchr(refname, ' ');
 700        if (msg) {
 701                struct strbuf msg_buf = STRBUF_INIT;
 702                const char *end;
 703
 704                *msg++ = '\0';
 705                if (!unquote_c_style(&msg_buf, msg, &end))
 706                        msg = strbuf_detach(&msg_buf, NULL);
 707                else
 708                        msg = xstrdup(msg);
 709                strbuf_release(&msg_buf);
 710
 711                if (!strcmp(msg, "no match")) {
 712                        status = REF_STATUS_NONE;
 713                        FREE_AND_NULL(msg);
 714                }
 715                else if (!strcmp(msg, "up to date")) {
 716                        status = REF_STATUS_UPTODATE;
 717                        FREE_AND_NULL(msg);
 718                }
 719                else if (!strcmp(msg, "non-fast forward")) {
 720                        status = REF_STATUS_REJECT_NONFASTFORWARD;
 721                        FREE_AND_NULL(msg);
 722                }
 723                else if (!strcmp(msg, "already exists")) {
 724                        status = REF_STATUS_REJECT_ALREADY_EXISTS;
 725                        FREE_AND_NULL(msg);
 726                }
 727                else if (!strcmp(msg, "fetch first")) {
 728                        status = REF_STATUS_REJECT_FETCH_FIRST;
 729                        FREE_AND_NULL(msg);
 730                }
 731                else if (!strcmp(msg, "needs force")) {
 732                        status = REF_STATUS_REJECT_NEEDS_FORCE;
 733                        FREE_AND_NULL(msg);
 734                }
 735                else if (!strcmp(msg, "stale info")) {
 736                        status = REF_STATUS_REJECT_STALE;
 737                        FREE_AND_NULL(msg);
 738                }
 739                else if (!strcmp(msg, "forced update")) {
 740                        forced = 1;
 741                        FREE_AND_NULL(msg);
 742                }
 743        }
 744
 745        if (*ref)
 746                *ref = find_ref_by_name(*ref, refname);
 747        if (!*ref)
 748                *ref = find_ref_by_name(remote_refs, refname);
 749        if (!*ref) {
 750                warning("helper reported unexpected status of %s", refname);
 751                return 1;
 752        }
 753
 754        if ((*ref)->status != REF_STATUS_NONE) {
 755                /*
 756                 * Earlier, the ref was marked not to be pushed, so ignore the ref
 757                 * status reported by the remote helper if the latter is 'no match'.
 758                 */
 759                if (status == REF_STATUS_NONE)
 760                        return 1;
 761        }
 762
 763        (*ref)->status = status;
 764        (*ref)->forced_update |= forced;
 765        (*ref)->remote_status = msg;
 766        return !(status == REF_STATUS_OK);
 767}
 768
 769static int push_update_refs_status(struct helper_data *data,
 770                                    struct ref *remote_refs,
 771                                    int flags)
 772{
 773        struct strbuf buf = STRBUF_INIT;
 774        struct ref *ref = remote_refs;
 775        int ret = 0;
 776
 777        for (;;) {
 778                char *private;
 779
 780                if (recvline(data, &buf)) {
 781                        ret = 1;
 782                        break;
 783                }
 784
 785                if (!buf.len)
 786                        break;
 787
 788                if (push_update_ref_status(&buf, &ref, remote_refs))
 789                        continue;
 790
 791                if (flags & TRANSPORT_PUSH_DRY_RUN || !data->refspecs || data->no_private_update)
 792                        continue;
 793
 794                /* propagate back the update to the remote namespace */
 795                private = apply_refspecs(data->refspecs, data->refspec_nr, ref->name);
 796                if (!private)
 797                        continue;
 798                update_ref("update by helper", private, ref->new_oid.hash, NULL, 0, 0);
 799                free(private);
 800        }
 801        strbuf_release(&buf);
 802        return ret;
 803}
 804
 805static void set_common_push_options(struct transport *transport,
 806                                   const char *name, int flags)
 807{
 808        if (flags & TRANSPORT_PUSH_DRY_RUN) {
 809                if (set_helper_option(transport, "dry-run", "true") != 0)
 810                        die("helper %s does not support dry-run", name);
 811        } else if (flags & TRANSPORT_PUSH_CERT_ALWAYS) {
 812                if (set_helper_option(transport, TRANS_OPT_PUSH_CERT, "true") != 0)
 813                        die("helper %s does not support --signed", name);
 814        } else if (flags & TRANSPORT_PUSH_CERT_IF_ASKED) {
 815                if (set_helper_option(transport, TRANS_OPT_PUSH_CERT, "if-asked") != 0)
 816                        die("helper %s does not support --signed=if-asked", name);
 817        }
 818
 819        if (flags & TRANSPORT_PUSH_OPTIONS) {
 820                struct string_list_item *item;
 821                for_each_string_list_item(item, transport->push_options)
 822                        if (set_helper_option(transport, "push-option", item->string) != 0)
 823                                die("helper %s does not support 'push-option'", name);
 824        }
 825}
 826
 827static int push_refs_with_push(struct transport *transport,
 828                               struct ref *remote_refs, int flags)
 829{
 830        int force_all = flags & TRANSPORT_PUSH_FORCE;
 831        int mirror = flags & TRANSPORT_PUSH_MIRROR;
 832        struct helper_data *data = transport->data;
 833        struct strbuf buf = STRBUF_INIT;
 834        struct ref *ref;
 835        struct string_list cas_options = STRING_LIST_INIT_DUP;
 836        struct string_list_item *cas_option;
 837
 838        get_helper(transport);
 839        if (!data->push)
 840                return 1;
 841
 842        for (ref = remote_refs; ref; ref = ref->next) {
 843                if (!ref->peer_ref && !mirror)
 844                        continue;
 845
 846                /* Check for statuses set by set_ref_status_for_push() */
 847                switch (ref->status) {
 848                case REF_STATUS_REJECT_NONFASTFORWARD:
 849                case REF_STATUS_REJECT_STALE:
 850                case REF_STATUS_REJECT_ALREADY_EXISTS:
 851                case REF_STATUS_UPTODATE:
 852                        continue;
 853                default:
 854                        ; /* do nothing */
 855                }
 856
 857                if (force_all)
 858                        ref->force = 1;
 859
 860                strbuf_addstr(&buf, "push ");
 861                if (!ref->deletion) {
 862                        if (ref->force)
 863                                strbuf_addch(&buf, '+');
 864                        if (ref->peer_ref)
 865                                strbuf_addstr(&buf, ref->peer_ref->name);
 866                        else
 867                                strbuf_addstr(&buf, oid_to_hex(&ref->new_oid));
 868                }
 869                strbuf_addch(&buf, ':');
 870                strbuf_addstr(&buf, ref->name);
 871                strbuf_addch(&buf, '\n');
 872
 873                /*
 874                 * The "--force-with-lease" options without explicit
 875                 * values to expect have already been expanded into
 876                 * the ref->old_oid_expect[] field; we can ignore
 877                 * transport->smart_options->cas altogether and instead
 878                 * can enumerate them from the refs.
 879                 */
 880                if (ref->expect_old_sha1) {
 881                        struct strbuf cas = STRBUF_INIT;
 882                        strbuf_addf(&cas, "%s:%s",
 883                                    ref->name, oid_to_hex(&ref->old_oid_expect));
 884                        string_list_append(&cas_options, strbuf_detach(&cas, NULL));
 885                }
 886        }
 887        if (buf.len == 0) {
 888                string_list_clear(&cas_options, 0);
 889                return 0;
 890        }
 891
 892        for_each_string_list_item(cas_option, &cas_options)
 893                set_helper_option(transport, "cas", cas_option->string);
 894        set_common_push_options(transport, data->name, flags);
 895
 896        strbuf_addch(&buf, '\n');
 897        sendline(data, &buf);
 898        strbuf_release(&buf);
 899
 900        return push_update_refs_status(data, remote_refs, flags);
 901}
 902
 903static int push_refs_with_export(struct transport *transport,
 904                struct ref *remote_refs, int flags)
 905{
 906        struct ref *ref;
 907        struct child_process *helper, exporter;
 908        struct helper_data *data = transport->data;
 909        struct string_list revlist_args = STRING_LIST_INIT_DUP;
 910        struct strbuf buf = STRBUF_INIT;
 911
 912        if (!data->refspecs)
 913                die("remote-helper doesn't support push; refspec needed");
 914
 915        set_common_push_options(transport, data->name, flags);
 916        if (flags & TRANSPORT_PUSH_FORCE) {
 917                if (set_helper_option(transport, "force", "true") != 0)
 918                        warning("helper %s does not support 'force'", data->name);
 919        }
 920
 921        helper = get_helper(transport);
 922
 923        write_constant(helper->in, "export\n");
 924
 925        for (ref = remote_refs; ref; ref = ref->next) {
 926                char *private;
 927                struct object_id oid;
 928
 929                private = apply_refspecs(data->refspecs, data->refspec_nr, ref->name);
 930                if (private && !get_sha1(private, oid.hash)) {
 931                        strbuf_addf(&buf, "^%s", private);
 932                        string_list_append(&revlist_args, strbuf_detach(&buf, NULL));
 933                        oidcpy(&ref->old_oid, &oid);
 934                }
 935                free(private);
 936
 937                if (ref->peer_ref) {
 938                        if (strcmp(ref->name, ref->peer_ref->name)) {
 939                                if (!ref->deletion) {
 940                                        const char *name;
 941                                        int flag;
 942
 943                                        /* Follow symbolic refs (mainly for HEAD). */
 944                                        name = resolve_ref_unsafe(
 945                                                 ref->peer_ref->name,
 946                                                 RESOLVE_REF_READING,
 947                                                 oid.hash, &flag);
 948                                        if (!name || !(flag & REF_ISSYMREF))
 949                                                name = ref->peer_ref->name;
 950
 951                                        strbuf_addf(&buf, "%s:%s", name, ref->name);
 952                                } else
 953                                        strbuf_addf(&buf, ":%s", ref->name);
 954
 955                                string_list_append(&revlist_args, "--refspec");
 956                                string_list_append(&revlist_args, buf.buf);
 957                                strbuf_release(&buf);
 958                        }
 959                        if (!ref->deletion)
 960                                string_list_append(&revlist_args, ref->peer_ref->name);
 961                }
 962        }
 963
 964        if (get_exporter(transport, &exporter, &revlist_args))
 965                die("Couldn't run fast-export");
 966
 967        string_list_clear(&revlist_args, 1);
 968
 969        if (finish_command(&exporter))
 970                die("Error while running fast-export");
 971        if (push_update_refs_status(data, remote_refs, flags))
 972                return 1;
 973
 974        if (data->export_marks) {
 975                strbuf_addf(&buf, "%s.tmp", data->export_marks);
 976                rename(buf.buf, data->export_marks);
 977                strbuf_release(&buf);
 978        }
 979
 980        return 0;
 981}
 982
 983static int push_refs(struct transport *transport,
 984                struct ref *remote_refs, int flags)
 985{
 986        struct helper_data *data = transport->data;
 987
 988        if (process_connect(transport, 1)) {
 989                do_take_over(transport);
 990                return transport->push_refs(transport, remote_refs, flags);
 991        }
 992
 993        if (!remote_refs) {
 994                fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
 995                        "Perhaps you should specify a branch such as 'master'.\n");
 996                return 0;
 997        }
 998
 999        if (data->push)
1000                return push_refs_with_push(transport, remote_refs, flags);
1001
1002        if (data->export)
1003                return push_refs_with_export(transport, remote_refs, flags);
1004
1005        return -1;
1006}
1007
1008
1009static int has_attribute(const char *attrs, const char *attr) {
1010        int len;
1011        if (!attrs)
1012                return 0;
1013
1014        len = strlen(attr);
1015        for (;;) {
1016                const char *space = strchrnul(attrs, ' ');
1017                if (len == space - attrs && !strncmp(attrs, attr, len))
1018                        return 1;
1019                if (!*space)
1020                        return 0;
1021                attrs = space + 1;
1022        }
1023}
1024
1025static struct ref *get_refs_list(struct transport *transport, int for_push)
1026{
1027        struct helper_data *data = transport->data;
1028        struct child_process *helper;
1029        struct ref *ret = NULL;
1030        struct ref **tail = &ret;
1031        struct ref *posn;
1032        struct strbuf buf = STRBUF_INIT;
1033
1034        helper = get_helper(transport);
1035
1036        if (process_connect(transport, for_push)) {
1037                do_take_over(transport);
1038                return transport->get_refs_list(transport, for_push);
1039        }
1040
1041        if (data->push && for_push)
1042                write_str_in_full(helper->in, "list for-push\n");
1043        else
1044                write_str_in_full(helper->in, "list\n");
1045
1046        while (1) {
1047                char *eov, *eon;
1048                if (recvline(data, &buf))
1049                        exit(128);
1050
1051                if (!*buf.buf)
1052                        break;
1053
1054                eov = strchr(buf.buf, ' ');
1055                if (!eov)
1056                        die("Malformed response in ref list: %s", buf.buf);
1057                eon = strchr(eov + 1, ' ');
1058                *eov = '\0';
1059                if (eon)
1060                        *eon = '\0';
1061                *tail = alloc_ref(eov + 1);
1062                if (buf.buf[0] == '@')
1063                        (*tail)->symref = xstrdup(buf.buf + 1);
1064                else if (buf.buf[0] != '?')
1065                        get_oid_hex(buf.buf, &(*tail)->old_oid);
1066                if (eon) {
1067                        if (has_attribute(eon + 1, "unchanged")) {
1068                                (*tail)->status |= REF_STATUS_UPTODATE;
1069                                if (read_ref((*tail)->name,
1070                                             (*tail)->old_oid.hash) < 0)
1071                                        die(_("Could not read ref %s"),
1072                                            (*tail)->name);
1073                        }
1074                }
1075                tail = &((*tail)->next);
1076        }
1077        if (debug)
1078                fprintf(stderr, "Debug: Read ref listing.\n");
1079        strbuf_release(&buf);
1080
1081        for (posn = ret; posn; posn = posn->next)
1082                resolve_remote_symref(posn, ret);
1083
1084        return ret;
1085}
1086
1087int transport_helper_init(struct transport *transport, const char *name)
1088{
1089        struct helper_data *data = xcalloc(1, sizeof(*data));
1090        data->name = name;
1091
1092        transport_check_allowed(name);
1093
1094        if (getenv("GIT_TRANSPORT_HELPER_DEBUG"))
1095                debug = 1;
1096
1097        transport->data = data;
1098        transport->set_option = set_helper_option;
1099        transport->get_refs_list = get_refs_list;
1100        transport->fetch = fetch;
1101        transport->push_refs = push_refs;
1102        transport->disconnect = release_helper;
1103        transport->connect = connect_helper;
1104        transport->smart_options = &(data->transport_options);
1105        return 0;
1106}
1107
1108/*
1109 * Linux pipes can buffer 65536 bytes at once (and most platforms can
1110 * buffer less), so attempt reads and writes with up to that size.
1111 */
1112#define BUFFERSIZE 65536
1113/* This should be enough to hold debugging message. */
1114#define PBUFFERSIZE 8192
1115
1116/* Print bidirectional transfer loop debug message. */
1117__attribute__((format (printf, 1, 2)))
1118static void transfer_debug(const char *fmt, ...)
1119{
1120        va_list args;
1121        char msgbuf[PBUFFERSIZE];
1122        static int debug_enabled = -1;
1123
1124        if (debug_enabled < 0)
1125                debug_enabled = getenv("GIT_TRANSLOOP_DEBUG") ? 1 : 0;
1126        if (!debug_enabled)
1127                return;
1128
1129        va_start(args, fmt);
1130        vsnprintf(msgbuf, PBUFFERSIZE, fmt, args);
1131        va_end(args);
1132        fprintf(stderr, "Transfer loop debugging: %s\n", msgbuf);
1133}
1134
1135/* Stream state: More data may be coming in this direction. */
1136#define SSTATE_TRANSFERRING 0
1137/*
1138 * Stream state: No more data coming in this direction, flushing rest of
1139 * data.
1140 */
1141#define SSTATE_FLUSHING 1
1142/* Stream state: Transfer in this direction finished. */
1143#define SSTATE_FINISHED 2
1144
1145#define STATE_NEEDS_READING(state) ((state) <= SSTATE_TRANSFERRING)
1146#define STATE_NEEDS_WRITING(state) ((state) <= SSTATE_FLUSHING)
1147#define STATE_NEEDS_CLOSING(state) ((state) == SSTATE_FLUSHING)
1148
1149/* Unidirectional transfer. */
1150struct unidirectional_transfer {
1151        /* Source */
1152        int src;
1153        /* Destination */
1154        int dest;
1155        /* Is source socket? */
1156        int src_is_sock;
1157        /* Is destination socket? */
1158        int dest_is_sock;
1159        /* Transfer state (TRANSFERRING/FLUSHING/FINISHED) */
1160        int state;
1161        /* Buffer. */
1162        char buf[BUFFERSIZE];
1163        /* Buffer used. */
1164        size_t bufuse;
1165        /* Name of source. */
1166        const char *src_name;
1167        /* Name of destination. */
1168        const char *dest_name;
1169};
1170
1171/* Closes the target (for writing) if transfer has finished. */
1172static void udt_close_if_finished(struct unidirectional_transfer *t)
1173{
1174        if (STATE_NEEDS_CLOSING(t->state) && !t->bufuse) {
1175                t->state = SSTATE_FINISHED;
1176                if (t->dest_is_sock)
1177                        shutdown(t->dest, SHUT_WR);
1178                else
1179                        close(t->dest);
1180                transfer_debug("Closed %s.", t->dest_name);
1181        }
1182}
1183
1184/*
1185 * Tries to read data from source into buffer. If buffer is full,
1186 * no data is read. Returns 0 on success, -1 on error.
1187 */
1188static int udt_do_read(struct unidirectional_transfer *t)
1189{
1190        ssize_t bytes;
1191
1192        if (t->bufuse == BUFFERSIZE)
1193                return 0;       /* No space for more. */
1194
1195        transfer_debug("%s is readable", t->src_name);
1196        bytes = read(t->src, t->buf + t->bufuse, BUFFERSIZE - t->bufuse);
1197        if (bytes < 0 && errno != EWOULDBLOCK && errno != EAGAIN &&
1198                errno != EINTR) {
1199                error_errno("read(%s) failed", t->src_name);
1200                return -1;
1201        } else if (bytes == 0) {
1202                transfer_debug("%s EOF (with %i bytes in buffer)",
1203                        t->src_name, (int)t->bufuse);
1204                t->state = SSTATE_FLUSHING;
1205        } else if (bytes > 0) {
1206                t->bufuse += bytes;
1207                transfer_debug("Read %i bytes from %s (buffer now at %i)",
1208                        (int)bytes, t->src_name, (int)t->bufuse);
1209        }
1210        return 0;
1211}
1212
1213/* Tries to write data from buffer into destination. If buffer is empty,
1214 * no data is written. Returns 0 on success, -1 on error.
1215 */
1216static int udt_do_write(struct unidirectional_transfer *t)
1217{
1218        ssize_t bytes;
1219
1220        if (t->bufuse == 0)
1221                return 0;       /* Nothing to write. */
1222
1223        transfer_debug("%s is writable", t->dest_name);
1224        bytes = xwrite(t->dest, t->buf, t->bufuse);
1225        if (bytes < 0 && errno != EWOULDBLOCK) {
1226                error_errno("write(%s) failed", t->dest_name);
1227                return -1;
1228        } else if (bytes > 0) {
1229                t->bufuse -= bytes;
1230                if (t->bufuse)
1231                        memmove(t->buf, t->buf + bytes, t->bufuse);
1232                transfer_debug("Wrote %i bytes to %s (buffer now at %i)",
1233                        (int)bytes, t->dest_name, (int)t->bufuse);
1234        }
1235        return 0;
1236}
1237
1238
1239/* State of bidirectional transfer loop. */
1240struct bidirectional_transfer_state {
1241        /* Direction from program to git. */
1242        struct unidirectional_transfer ptg;
1243        /* Direction from git to program. */
1244        struct unidirectional_transfer gtp;
1245};
1246
1247static void *udt_copy_task_routine(void *udt)
1248{
1249        struct unidirectional_transfer *t = (struct unidirectional_transfer *)udt;
1250        while (t->state != SSTATE_FINISHED) {
1251                if (STATE_NEEDS_READING(t->state))
1252                        if (udt_do_read(t))
1253                                return NULL;
1254                if (STATE_NEEDS_WRITING(t->state))
1255                        if (udt_do_write(t))
1256                                return NULL;
1257                if (STATE_NEEDS_CLOSING(t->state))
1258                        udt_close_if_finished(t);
1259        }
1260        return udt;     /* Just some non-NULL value. */
1261}
1262
1263#ifndef NO_PTHREADS
1264
1265/*
1266 * Join thread, with appropriate errors on failure. Name is name for the
1267 * thread (for error messages). Returns 0 on success, 1 on failure.
1268 */
1269static int tloop_join(pthread_t thread, const char *name)
1270{
1271        int err;
1272        void *tret;
1273        err = pthread_join(thread, &tret);
1274        if (!tret) {
1275                error("%s thread failed", name);
1276                return 1;
1277        }
1278        if (err) {
1279                error("%s thread failed to join: %s", name, strerror(err));
1280                return 1;
1281        }
1282        return 0;
1283}
1284
1285/*
1286 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1287 * -1 on failure.
1288 */
1289static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s)
1290{
1291        pthread_t gtp_thread;
1292        pthread_t ptg_thread;
1293        int err;
1294        int ret = 0;
1295        err = pthread_create(&gtp_thread, NULL, udt_copy_task_routine,
1296                &s->gtp);
1297        if (err)
1298                die("Can't start thread for copying data: %s", strerror(err));
1299        err = pthread_create(&ptg_thread, NULL, udt_copy_task_routine,
1300                &s->ptg);
1301        if (err)
1302                die("Can't start thread for copying data: %s", strerror(err));
1303
1304        ret |= tloop_join(gtp_thread, "Git to program copy");
1305        ret |= tloop_join(ptg_thread, "Program to git copy");
1306        return ret;
1307}
1308#else
1309
1310/* Close the source and target (for writing) for transfer. */
1311static void udt_kill_transfer(struct unidirectional_transfer *t)
1312{
1313        t->state = SSTATE_FINISHED;
1314        /*
1315         * Socket read end left open isn't a disaster if nobody
1316         * attempts to read from it (mingw compat headers do not
1317         * have SHUT_RD)...
1318         *
1319         * We can't fully close the socket since otherwise gtp
1320         * task would first close the socket it sends data to
1321         * while closing the ptg file descriptors.
1322         */
1323        if (!t->src_is_sock)
1324                close(t->src);
1325        if (t->dest_is_sock)
1326                shutdown(t->dest, SHUT_WR);
1327        else
1328                close(t->dest);
1329}
1330
1331/*
1332 * Join process, with appropriate errors on failure. Name is name for the
1333 * process (for error messages). Returns 0 on success, 1 on failure.
1334 */
1335static int tloop_join(pid_t pid, const char *name)
1336{
1337        int tret;
1338        if (waitpid(pid, &tret, 0) < 0) {
1339                error_errno("%s process failed to wait", name);
1340                return 1;
1341        }
1342        if (!WIFEXITED(tret) || WEXITSTATUS(tret)) {
1343                error("%s process failed", name);
1344                return 1;
1345        }
1346        return 0;
1347}
1348
1349/*
1350 * Spawn the transfer tasks and then wait for them. Returns 0 on success,
1351 * -1 on failure.
1352 */
1353static int tloop_spawnwait_tasks(struct bidirectional_transfer_state *s)
1354{
1355        pid_t pid1, pid2;
1356        int ret = 0;
1357
1358        /* Fork thread #1: git to program. */
1359        pid1 = fork();
1360        if (pid1 < 0)
1361                die_errno("Can't start thread for copying data");
1362        else if (pid1 == 0) {
1363                udt_kill_transfer(&s->ptg);
1364                exit(udt_copy_task_routine(&s->gtp) ? 0 : 1);
1365        }
1366
1367        /* Fork thread #2: program to git. */
1368        pid2 = fork();
1369        if (pid2 < 0)
1370                die_errno("Can't start thread for copying data");
1371        else if (pid2 == 0) {
1372                udt_kill_transfer(&s->gtp);
1373                exit(udt_copy_task_routine(&s->ptg) ? 0 : 1);
1374        }
1375
1376        /*
1377         * Close both streams in parent as to not interfere with
1378         * end of file detection and wait for both tasks to finish.
1379         */
1380        udt_kill_transfer(&s->gtp);
1381        udt_kill_transfer(&s->ptg);
1382        ret |= tloop_join(pid1, "Git to program copy");
1383        ret |= tloop_join(pid2, "Program to git copy");
1384        return ret;
1385}
1386#endif
1387
1388/*
1389 * Copies data from stdin to output and from input to stdout simultaneously.
1390 * Additionally filtering through given filter. If filter is NULL, uses
1391 * identity filter.
1392 */
1393int bidirectional_transfer_loop(int input, int output)
1394{
1395        struct bidirectional_transfer_state state;
1396
1397        /* Fill the state fields. */
1398        state.ptg.src = input;
1399        state.ptg.dest = 1;
1400        state.ptg.src_is_sock = (input == output);
1401        state.ptg.dest_is_sock = 0;
1402        state.ptg.state = SSTATE_TRANSFERRING;
1403        state.ptg.bufuse = 0;
1404        state.ptg.src_name = "remote input";
1405        state.ptg.dest_name = "stdout";
1406
1407        state.gtp.src = 0;
1408        state.gtp.dest = output;
1409        state.gtp.src_is_sock = 0;
1410        state.gtp.dest_is_sock = (input == output);
1411        state.gtp.state = SSTATE_TRANSFERRING;
1412        state.gtp.bufuse = 0;
1413        state.gtp.src_name = "stdin";
1414        state.gtp.dest_name = "remote output";
1415
1416        return tloop_spawnwait_tasks(&state);
1417}