Andrew's git / gitweb.git / remote-curl.c
?
remote-curl.con commit curl: anonymize URLs in error messages and warnings (c1284b2)
   1#include "cache.h"
   2#include "config.h"
   3#include "remote.h"
   4#include "connect.h"
   5#include "strbuf.h"
   6#include "walker.h"
   7#include "http.h"
   8#include "exec-cmd.h"
   9#include "run-command.h"
  10#include "pkt-line.h"
  11#include "string-list.h"
  12#include "sideband.h"
  13#include "argv-array.h"
  14#include "credential.h"
  15#include "sha1-array.h"
  16#include "send-pack.h"
  17#include "protocol.h"
  18#include "quote.h"
  19#include "transport.h"
  20
  21static struct remote *remote;
  22/* always ends with a trailing slash */
  23static struct strbuf url = STRBUF_INIT;
  24
  25struct options {
  26        int verbosity;
  27        unsigned long depth;
  28        char *deepen_since;
  29        struct string_list deepen_not;
  30        struct string_list push_options;
  31        char *filter;
  32        unsigned progress : 1,
  33                check_self_contained_and_connected : 1,
  34                cloning : 1,
  35                update_shallow : 1,
  36                followtags : 1,
  37                dry_run : 1,
  38                thin : 1,
  39                /* One of the SEND_PACK_PUSH_CERT_* constants. */
  40                push_cert : 2,
  41                deepen_relative : 1,
  42                from_promisor : 1,
  43                no_dependents : 1;
  44};
  45static struct options options;
  46static struct string_list cas_options = STRING_LIST_INIT_DUP;
  47
  48static int set_option(const char *name, const char *value)
  49{
  50        if (!strcmp(name, "verbosity")) {
  51                char *end;
  52                int v = strtol(value, &end, 10);
  53                if (value == end || *end)
  54                        return -1;
  55                options.verbosity = v;
  56                return 0;
  57        }
  58        else if (!strcmp(name, "progress")) {
  59                if (!strcmp(value, "true"))
  60                        options.progress = 1;
  61                else if (!strcmp(value, "false"))
  62                        options.progress = 0;
  63                else
  64                        return -1;
  65                return 0;
  66        }
  67        else if (!strcmp(name, "depth")) {
  68                char *end;
  69                unsigned long v = strtoul(value, &end, 10);
  70                if (value == end || *end)
  71                        return -1;
  72                options.depth = v;
  73                return 0;
  74        }
  75        else if (!strcmp(name, "deepen-since")) {
  76                options.deepen_since = xstrdup(value);
  77                return 0;
  78        }
  79        else if (!strcmp(name, "deepen-not")) {
  80                string_list_append(&options.deepen_not, value);
  81                return 0;
  82        }
  83        else if (!strcmp(name, "deepen-relative")) {
  84                if (!strcmp(value, "true"))
  85                        options.deepen_relative = 1;
  86                else if (!strcmp(value, "false"))
  87                        options.deepen_relative = 0;
  88                else
  89                        return -1;
  90                return 0;
  91        }
  92        else if (!strcmp(name, "followtags")) {
  93                if (!strcmp(value, "true"))
  94                        options.followtags = 1;
  95                else if (!strcmp(value, "false"))
  96                        options.followtags = 0;
  97                else
  98                        return -1;
  99                return 0;
 100        }
 101        else if (!strcmp(name, "dry-run")) {
 102                if (!strcmp(value, "true"))
 103                        options.dry_run = 1;
 104                else if (!strcmp(value, "false"))
 105                        options.dry_run = 0;
 106                else
 107                        return -1;
 108                return 0;
 109        }
 110        else if (!strcmp(name, "check-connectivity")) {
 111                if (!strcmp(value, "true"))
 112                        options.check_self_contained_and_connected = 1;
 113                else if (!strcmp(value, "false"))
 114                        options.check_self_contained_and_connected = 0;
 115                else
 116                        return -1;
 117                return 0;
 118        }
 119        else if (!strcmp(name, "cas")) {
 120                struct strbuf val = STRBUF_INIT;
 121                strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
 122                string_list_append(&cas_options, val.buf);
 123                strbuf_release(&val);
 124                return 0;
 125        } else if (!strcmp(name, "cloning")) {
 126                if (!strcmp(value, "true"))
 127                        options.cloning = 1;
 128                else if (!strcmp(value, "false"))
 129                        options.cloning = 0;
 130                else
 131                        return -1;
 132                return 0;
 133        } else if (!strcmp(name, "update-shallow")) {
 134                if (!strcmp(value, "true"))
 135                        options.update_shallow = 1;
 136                else if (!strcmp(value, "false"))
 137                        options.update_shallow = 0;
 138                else
 139                        return -1;
 140                return 0;
 141        } else if (!strcmp(name, "pushcert")) {
 142                if (!strcmp(value, "true"))
 143                        options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 144                else if (!strcmp(value, "false"))
 145                        options.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 146                else if (!strcmp(value, "if-asked"))
 147                        options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 148                else
 149                        return -1;
 150                return 0;
 151        } else if (!strcmp(name, "push-option")) {
 152                if (*value != '"')
 153                        string_list_append(&options.push_options, value);
 154                else {
 155                        struct strbuf unquoted = STRBUF_INIT;
 156                        if (unquote_c_style(&unquoted, value, NULL) < 0)
 157                                die("invalid quoting in push-option value");
 158                        string_list_append_nodup(&options.push_options,
 159                                                 strbuf_detach(&unquoted, NULL));
 160                }
 161                return 0;
 162
 163#if LIBCURL_VERSION_NUM >= 0x070a08
 164        } else if (!strcmp(name, "family")) {
 165                if (!strcmp(value, "ipv4"))
 166                        git_curl_ipresolve = CURL_IPRESOLVE_V4;
 167                else if (!strcmp(value, "ipv6"))
 168                        git_curl_ipresolve = CURL_IPRESOLVE_V6;
 169                else if (!strcmp(value, "all"))
 170                        git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
 171                else
 172                        return -1;
 173                return 0;
 174#endif /* LIBCURL_VERSION_NUM >= 0x070a08 */
 175        } else if (!strcmp(name, "from-promisor")) {
 176                options.from_promisor = 1;
 177                return 0;
 178        } else if (!strcmp(name, "no-dependents")) {
 179                options.no_dependents = 1;
 180                return 0;
 181        } else if (!strcmp(name, "filter")) {
 182                options.filter = xstrdup(value);
 183                return 0;
 184        } else {
 185                return 1 /* unsupported */;
 186        }
 187}
 188
 189struct discovery {
 190        char *service;
 191        char *buf_alloc;
 192        char *buf;
 193        size_t len;
 194        struct ref *refs;
 195        struct oid_array shallow;
 196        enum protocol_version version;
 197        unsigned proto_git : 1;
 198};
 199static struct discovery *last_discovery;
 200
 201static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 202{
 203        struct ref *list = NULL;
 204        struct packet_reader reader;
 205
 206        packet_reader_init(&reader, -1, heads->buf, heads->len,
 207                           PACKET_READ_CHOMP_NEWLINE |
 208                           PACKET_READ_GENTLE_ON_EOF);
 209
 210        heads->version = discover_version(&reader);
 211        switch (heads->version) {
 212        case protocol_v2:
 213                /*
 214                 * Do nothing.  This isn't a list of refs but rather a
 215                 * capability advertisement.  Client would have run
 216                 * 'stateless-connect' so we'll dump this capability listing
 217                 * and let them request the refs themselves.
 218                 */
 219                break;
 220        case protocol_v1:
 221        case protocol_v0:
 222                get_remote_heads(&reader, &list, for_push ? REF_NORMAL : 0,
 223                                 NULL, &heads->shallow);
 224                break;
 225        case protocol_unknown_version:
 226                BUG("unknown protocol version");
 227        }
 228
 229        return list;
 230}
 231
 232static struct ref *parse_info_refs(struct discovery *heads)
 233{
 234        char *data, *start, *mid;
 235        char *ref_name;
 236        int i = 0;
 237
 238        struct ref *refs = NULL;
 239        struct ref *ref = NULL;
 240        struct ref *last_ref = NULL;
 241
 242        data = heads->buf;
 243        start = NULL;
 244        mid = data;
 245        while (i < heads->len) {
 246                if (!start) {
 247                        start = &data[i];
 248                }
 249                if (data[i] == '\t')
 250                        mid = &data[i];
 251                if (data[i] == '\n') {
 252                        if (mid - start != 40)
 253                                die("%sinfo/refs not valid: is this a git repository?",
 254                                    transport_anonymize_url(url.buf));
 255                        data[i] = 0;
 256                        ref_name = mid + 1;
 257                        ref = alloc_ref(ref_name);
 258                        get_oid_hex(start, &ref->old_oid);
 259                        if (!refs)
 260                                refs = ref;
 261                        if (last_ref)
 262                                last_ref->next = ref;
 263                        last_ref = ref;
 264                        start = NULL;
 265                }
 266                i++;
 267        }
 268
 269        ref = alloc_ref("HEAD");
 270        if (!http_fetch_ref(url.buf, ref) &&
 271            !resolve_remote_symref(ref, refs)) {
 272                ref->next = refs;
 273                refs = ref;
 274        } else {
 275                free(ref);
 276        }
 277
 278        return refs;
 279}
 280
 281static void free_discovery(struct discovery *d)
 282{
 283        if (d) {
 284                if (d == last_discovery)
 285                        last_discovery = NULL;
 286                free(d->shallow.oid);
 287                free(d->buf_alloc);
 288                free_refs(d->refs);
 289                free(d->service);
 290                free(d);
 291        }
 292}
 293
 294static int show_http_message(struct strbuf *type, struct strbuf *charset,
 295                             struct strbuf *msg)
 296{
 297        const char *p, *eol;
 298
 299        /*
 300         * We only show text/plain parts, as other types are likely
 301         * to be ugly to look at on the user's terminal.
 302         */
 303        if (strcmp(type->buf, "text/plain"))
 304                return -1;
 305        if (charset->len)
 306                strbuf_reencode(msg, charset->buf, get_log_output_encoding());
 307
 308        strbuf_trim(msg);
 309        if (!msg->len)
 310                return -1;
 311
 312        p = msg->buf;
 313        do {
 314                eol = strchrnul(p, '\n');
 315                fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 316                p = eol + 1;
 317        } while(*eol);
 318        return 0;
 319}
 320
 321static int get_protocol_http_header(enum protocol_version version,
 322                                    struct strbuf *header)
 323{
 324        if (version > 0) {
 325                strbuf_addf(header, GIT_PROTOCOL_HEADER ": version=%d",
 326                            version);
 327
 328                return 1;
 329        }
 330
 331        return 0;
 332}
 333
 334static struct discovery *discover_refs(const char *service, int for_push)
 335{
 336        struct strbuf exp = STRBUF_INIT;
 337        struct strbuf type = STRBUF_INIT;
 338        struct strbuf charset = STRBUF_INIT;
 339        struct strbuf buffer = STRBUF_INIT;
 340        struct strbuf refs_url = STRBUF_INIT;
 341        struct strbuf effective_url = STRBUF_INIT;
 342        struct strbuf protocol_header = STRBUF_INIT;
 343        struct string_list extra_headers = STRING_LIST_INIT_DUP;
 344        struct discovery *last = last_discovery;
 345        int http_ret, maybe_smart = 0;
 346        struct http_get_options http_options;
 347        enum protocol_version version = get_protocol_version_config();
 348
 349        if (last && !strcmp(service, last->service))
 350                return last;
 351        free_discovery(last);
 352
 353        strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 354        if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 355             git_env_bool("GIT_SMART_HTTP", 1)) {
 356                maybe_smart = 1;
 357                if (!strchr(url.buf, '?'))
 358                        strbuf_addch(&refs_url, '?');
 359                else
 360                        strbuf_addch(&refs_url, '&');
 361                strbuf_addf(&refs_url, "service=%s", service);
 362        }
 363
 364        /*
 365         * NEEDSWORK: If we are trying to use protocol v2 and we are planning
 366         * to perform a push, then fallback to v0 since the client doesn't know
 367         * how to push yet using v2.
 368         */
 369        if (version == protocol_v2 && !strcmp("git-receive-pack", service))
 370                version = protocol_v0;
 371
 372        /* Add the extra Git-Protocol header */
 373        if (get_protocol_http_header(version, &protocol_header))
 374                string_list_append(&extra_headers, protocol_header.buf);
 375
 376        memset(&http_options, 0, sizeof(http_options));
 377        http_options.content_type = &type;
 378        http_options.charset = &charset;
 379        http_options.effective_url = &effective_url;
 380        http_options.base_url = &url;
 381        http_options.extra_headers = &extra_headers;
 382        http_options.initial_request = 1;
 383        http_options.no_cache = 1;
 384        http_options.keep_error = 1;
 385
 386        http_ret = http_get_strbuf(refs_url.buf, &buffer, &http_options);
 387        switch (http_ret) {
 388        case HTTP_OK:
 389                break;
 390        case HTTP_MISSING_TARGET:
 391                show_http_message(&type, &charset, &buffer);
 392                die("repository '%s' not found",
 393                    transport_anonymize_url(url.buf));
 394        case HTTP_NOAUTH:
 395                show_http_message(&type, &charset, &buffer);
 396                die("Authentication failed for '%s'",
 397                    transport_anonymize_url(url.buf));
 398        default:
 399                show_http_message(&type, &charset, &buffer);
 400                die("unable to access '%s': %s",
 401                    transport_anonymize_url(url.buf), curl_errorstr);
 402        }
 403
 404        if (options.verbosity && !starts_with(refs_url.buf, url.buf)) {
 405                char *u = transport_anonymize_url(url.buf);
 406                warning(_("redirecting to %s"), u);
 407                free(u);
 408        }
 409
 410        last= xcalloc(1, sizeof(*last_discovery));
 411        last->service = xstrdup(service);
 412        last->buf_alloc = strbuf_detach(&buffer, &last->len);
 413        last->buf = last->buf_alloc;
 414
 415        strbuf_addf(&exp, "application/x-%s-advertisement", service);
 416        if (maybe_smart &&
 417            (5 <= last->len && last->buf[4] == '#') &&
 418            !strbuf_cmp(&exp, &type)) {
 419                char *line;
 420
 421                /*
 422                 * smart HTTP response; validate that the service
 423                 * pkt-line matches our request.
 424                 */
 425                line = packet_read_line_buf(&last->buf, &last->len, NULL);
 426                if (!line)
 427                        die("invalid server response; expected service, got flush packet");
 428
 429                strbuf_reset(&exp);
 430                strbuf_addf(&exp, "# service=%s", service);
 431                if (strcmp(line, exp.buf))
 432                        die("invalid server response; got '%s'", line);
 433                strbuf_release(&exp);
 434
 435                /* The header can include additional metadata lines, up
 436                 * until a packet flush marker.  Ignore these now, but
 437                 * in the future we might start to scan them.
 438                 */
 439                while (packet_read_line_buf(&last->buf, &last->len, NULL))
 440                        ;
 441
 442                last->proto_git = 1;
 443        } else if (maybe_smart &&
 444                   last->len > 5 && starts_with(last->buf + 4, "version 2")) {
 445                last->proto_git = 1;
 446        }
 447
 448        if (last->proto_git)
 449                last->refs = parse_git_refs(last, for_push);
 450        else
 451                last->refs = parse_info_refs(last);
 452
 453        strbuf_release(&refs_url);
 454        strbuf_release(&exp);
 455        strbuf_release(&type);
 456        strbuf_release(&charset);
 457        strbuf_release(&effective_url);
 458        strbuf_release(&buffer);
 459        strbuf_release(&protocol_header);
 460        string_list_clear(&extra_headers, 0);
 461        last_discovery = last;
 462        return last;
 463}
 464
 465static struct ref *get_refs(int for_push)
 466{
 467        struct discovery *heads;
 468
 469        if (for_push)
 470                heads = discover_refs("git-receive-pack", for_push);
 471        else
 472                heads = discover_refs("git-upload-pack", for_push);
 473
 474        return heads->refs;
 475}
 476
 477static void output_refs(struct ref *refs)
 478{
 479        struct ref *posn;
 480        for (posn = refs; posn; posn = posn->next) {
 481                if (posn->symref)
 482                        printf("@%s %s\n", posn->symref, posn->name);
 483                else
 484                        printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name);
 485        }
 486        printf("\n");
 487        fflush(stdout);
 488}
 489
 490struct rpc_state {
 491        const char *service_name;
 492        const char **argv;
 493        struct strbuf *stdin_preamble;
 494        char *service_url;
 495        char *hdr_content_type;
 496        char *hdr_accept;
 497        char *protocol_header;
 498        char *buf;
 499        size_t alloc;
 500        size_t len;
 501        size_t pos;
 502        int in;
 503        int out;
 504        int any_written;
 505        struct strbuf result;
 506        unsigned gzip_request : 1;
 507        unsigned initial_buffer : 1;
 508};
 509
 510static size_t rpc_out(void *ptr, size_t eltsize,
 511                size_t nmemb, void *buffer_)
 512{
 513        size_t max = eltsize * nmemb;
 514        struct rpc_state *rpc = buffer_;
 515        size_t avail = rpc->len - rpc->pos;
 516
 517        if (!avail) {
 518                rpc->initial_buffer = 0;
 519                avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 520                if (!avail)
 521                        return 0;
 522                rpc->pos = 0;
 523                rpc->len = avail;
 524        }
 525
 526        if (max < avail)
 527                avail = max;
 528        memcpy(ptr, rpc->buf + rpc->pos, avail);
 529        rpc->pos += avail;
 530        return avail;
 531}
 532
 533#ifndef NO_CURL_IOCTL
 534static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 535{
 536        struct rpc_state *rpc = clientp;
 537
 538        switch (cmd) {
 539        case CURLIOCMD_NOP:
 540                return CURLIOE_OK;
 541
 542        case CURLIOCMD_RESTARTREAD:
 543                if (rpc->initial_buffer) {
 544                        rpc->pos = 0;
 545                        return CURLIOE_OK;
 546                }
 547                error("unable to rewind rpc post data - try increasing http.postBuffer");
 548                return CURLIOE_FAILRESTART;
 549
 550        default:
 551                return CURLIOE_UNKNOWNCMD;
 552        }
 553}
 554#endif
 555
 556static size_t rpc_in(char *ptr, size_t eltsize,
 557                size_t nmemb, void *buffer_)
 558{
 559        size_t size = eltsize * nmemb;
 560        struct rpc_state *rpc = buffer_;
 561        if (size)
 562                rpc->any_written = 1;
 563        write_or_die(rpc->in, ptr, size);
 564        return size;
 565}
 566
 567static int run_slot(struct active_request_slot *slot,
 568                    struct slot_results *results)
 569{
 570        int err;
 571        struct slot_results results_buf;
 572
 573        if (!results)
 574                results = &results_buf;
 575
 576        err = run_one_slot(slot, results);
 577
 578        if (err != HTTP_OK && err != HTTP_REAUTH) {
 579                struct strbuf msg = STRBUF_INIT;
 580                if (results->http_code && results->http_code != 200)
 581                        strbuf_addf(&msg, "HTTP %ld", results->http_code);
 582                if (results->curl_result != CURLE_OK) {
 583                        if (msg.len)
 584                                strbuf_addch(&msg, ' ');
 585                        strbuf_addf(&msg, "curl %d", results->curl_result);
 586                        if (curl_errorstr[0]) {
 587                                strbuf_addch(&msg, ' ');
 588                                strbuf_addstr(&msg, curl_errorstr);
 589                        }
 590                }
 591                error("RPC failed; %s", msg.buf);
 592                strbuf_release(&msg);
 593        }
 594
 595        return err;
 596}
 597
 598static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 599{
 600        struct active_request_slot *slot;
 601        struct curl_slist *headers = http_copy_default_headers();
 602        struct strbuf buf = STRBUF_INIT;
 603        int err;
 604
 605        slot = get_active_slot();
 606
 607        headers = curl_slist_append(headers, rpc->hdr_content_type);
 608        headers = curl_slist_append(headers, rpc->hdr_accept);
 609
 610        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 611        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 612        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 613        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 614        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 615        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 616        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 617        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 618        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 619
 620        err = run_slot(slot, results);
 621
 622        curl_slist_free_all(headers);
 623        strbuf_release(&buf);
 624        return err;
 625}
 626
 627static curl_off_t xcurl_off_t(ssize_t len) {
 628        if (len > maximum_signed_value_of_type(curl_off_t))
 629                die("cannot handle pushes this big");
 630        return (curl_off_t) len;
 631}
 632
 633static int post_rpc(struct rpc_state *rpc)
 634{
 635        struct active_request_slot *slot;
 636        struct curl_slist *headers = http_copy_default_headers();
 637        int use_gzip = rpc->gzip_request;
 638        char *gzip_body = NULL;
 639        size_t gzip_size = 0;
 640        int err, large_request = 0;
 641        int needs_100_continue = 0;
 642
 643        /* Try to load the entire request, if we can fit it into the
 644         * allocated buffer space we can use HTTP/1.0 and avoid the
 645         * chunked encoding mess.
 646         */
 647        while (1) {
 648                size_t left = rpc->alloc - rpc->len;
 649                char *buf = rpc->buf + rpc->len;
 650                int n;
 651
 652                if (left < LARGE_PACKET_MAX) {
 653                        large_request = 1;
 654                        use_gzip = 0;
 655                        break;
 656                }
 657
 658                n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 659                if (!n)
 660                        break;
 661                rpc->len += n;
 662        }
 663
 664        if (large_request) {
 665                struct slot_results results;
 666
 667                do {
 668                        err = probe_rpc(rpc, &results);
 669                        if (err == HTTP_REAUTH)
 670                                credential_fill(&http_auth);
 671                } while (err == HTTP_REAUTH);
 672                if (err != HTTP_OK)
 673                        return -1;
 674
 675                if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 676                        needs_100_continue = 1;
 677        }
 678
 679        headers = curl_slist_append(headers, rpc->hdr_content_type);
 680        headers = curl_slist_append(headers, rpc->hdr_accept);
 681        headers = curl_slist_append(headers, needs_100_continue ?
 682                "Expect: 100-continue" : "Expect:");
 683
 684        /* Add the extra Git-Protocol header */
 685        if (rpc->protocol_header)
 686                headers = curl_slist_append(headers, rpc->protocol_header);
 687
 688retry:
 689        slot = get_active_slot();
 690
 691        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 692        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 693        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 694        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 695
 696        if (large_request) {
 697                /* The request body is large and the size cannot be predicted.
 698                 * We must use chunked encoding to send it.
 699                 */
 700                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 701                rpc->initial_buffer = 1;
 702                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 703                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 704#ifndef NO_CURL_IOCTL
 705                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 706                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 707#endif
 708                if (options.verbosity > 1) {
 709                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 710                        fflush(stderr);
 711                }
 712
 713        } else if (gzip_body) {
 714                /*
 715                 * If we are looping to retry authentication, then the previous
 716                 * run will have set up the headers and gzip buffer already,
 717                 * and we just need to send it.
 718                 */
 719                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 720                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 721
 722        } else if (use_gzip && 1024 < rpc->len) {
 723                /* The client backend isn't giving us compressed data so
 724                 * we can try to deflate it ourselves, this may save on
 725                 * the transfer time.
 726                 */
 727                git_zstream stream;
 728                int ret;
 729
 730                git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 731                gzip_size = git_deflate_bound(&stream, rpc->len);
 732                gzip_body = xmalloc(gzip_size);
 733
 734                stream.next_in = (unsigned char *)rpc->buf;
 735                stream.avail_in = rpc->len;
 736                stream.next_out = (unsigned char *)gzip_body;
 737                stream.avail_out = gzip_size;
 738
 739                ret = git_deflate(&stream, Z_FINISH);
 740                if (ret != Z_STREAM_END)
 741                        die("cannot deflate request; zlib deflate error %d", ret);
 742
 743                ret = git_deflate_end_gently(&stream);
 744                if (ret != Z_OK)
 745                        die("cannot deflate request; zlib end error %d", ret);
 746
 747                gzip_size = stream.total_out;
 748
 749                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 750                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 751                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 752
 753                if (options.verbosity > 1) {
 754                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 755                                rpc->service_name,
 756                                (unsigned long)rpc->len, (unsigned long)gzip_size);
 757                        fflush(stderr);
 758                }
 759        } else {
 760                /* We know the complete request size in advance, use the
 761                 * more normal Content-Length approach.
 762                 */
 763                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 764                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(rpc->len));
 765                if (options.verbosity > 1) {
 766                        fprintf(stderr, "POST %s (%lu bytes)\n",
 767                                rpc->service_name, (unsigned long)rpc->len);
 768                        fflush(stderr);
 769                }
 770        }
 771
 772        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 773        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 774        curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 775
 776
 777        rpc->any_written = 0;
 778        err = run_slot(slot, NULL);
 779        if (err == HTTP_REAUTH && !large_request) {
 780                credential_fill(&http_auth);
 781                goto retry;
 782        }
 783        if (err != HTTP_OK)
 784                err = -1;
 785
 786        if (!rpc->any_written)
 787                err = -1;
 788
 789        curl_slist_free_all(headers);
 790        free(gzip_body);
 791        return err;
 792}
 793
 794static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 795{
 796        const char *svc = rpc->service_name;
 797        struct strbuf buf = STRBUF_INIT;
 798        struct strbuf *preamble = rpc->stdin_preamble;
 799        struct child_process client = CHILD_PROCESS_INIT;
 800        int err = 0;
 801
 802        client.in = -1;
 803        client.out = -1;
 804        client.git_cmd = 1;
 805        client.argv = rpc->argv;
 806        if (start_command(&client))
 807                exit(1);
 808        if (preamble)
 809                write_or_die(client.in, preamble->buf, preamble->len);
 810        if (heads)
 811                write_or_die(client.in, heads->buf, heads->len);
 812
 813        rpc->alloc = http_post_buffer;
 814        rpc->buf = xmalloc(rpc->alloc);
 815        rpc->in = client.in;
 816        rpc->out = client.out;
 817        strbuf_init(&rpc->result, 0);
 818
 819        strbuf_addf(&buf, "%s%s", url.buf, svc);
 820        rpc->service_url = strbuf_detach(&buf, NULL);
 821
 822        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 823        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 824
 825        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 826        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 827
 828        if (get_protocol_http_header(heads->version, &buf))
 829                rpc->protocol_header = strbuf_detach(&buf, NULL);
 830        else
 831                rpc->protocol_header = NULL;
 832
 833        while (!err) {
 834                int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 835                if (!n)
 836                        break;
 837                rpc->pos = 0;
 838                rpc->len = n;
 839                err |= post_rpc(rpc);
 840        }
 841
 842        close(client.in);
 843        client.in = -1;
 844        if (!err) {
 845                strbuf_read(&rpc->result, client.out, 0);
 846        } else {
 847                char buf[4096];
 848                for (;;)
 849                        if (xread(client.out, buf, sizeof(buf)) <= 0)
 850                                break;
 851        }
 852
 853        close(client.out);
 854        client.out = -1;
 855
 856        err |= finish_command(&client);
 857        free(rpc->service_url);
 858        free(rpc->hdr_content_type);
 859        free(rpc->hdr_accept);
 860        free(rpc->protocol_header);
 861        free(rpc->buf);
 862        strbuf_release(&buf);
 863        return err;
 864}
 865
 866static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 867{
 868        struct walker *walker;
 869        char **targets;
 870        int ret, i;
 871
 872        ALLOC_ARRAY(targets, nr_heads);
 873        if (options.depth || options.deepen_since)
 874                die("dumb http transport does not support shallow capabilities");
 875        for (i = 0; i < nr_heads; i++)
 876                targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
 877
 878        walker = get_http_walker(url.buf);
 879        walker->get_verbosely = options.verbosity >= 3;
 880        walker->get_recover = 0;
 881        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 882        walker_free(walker);
 883
 884        for (i = 0; i < nr_heads; i++)
 885                free(targets[i]);
 886        free(targets);
 887
 888        return ret ? error("fetch failed.") : 0;
 889}
 890
 891static int fetch_git(struct discovery *heads,
 892        int nr_heads, struct ref **to_fetch)
 893{
 894        struct rpc_state rpc;
 895        struct strbuf preamble = STRBUF_INIT;
 896        int i, err;
 897        struct argv_array args = ARGV_ARRAY_INIT;
 898
 899        argv_array_pushl(&args, "fetch-pack", "--stateless-rpc",
 900                         "--stdin", "--lock-pack", NULL);
 901        if (options.followtags)
 902                argv_array_push(&args, "--include-tag");
 903        if (options.thin)
 904                argv_array_push(&args, "--thin");
 905        if (options.verbosity >= 3)
 906                argv_array_pushl(&args, "-v", "-v", NULL);
 907        if (options.check_self_contained_and_connected)
 908                argv_array_push(&args, "--check-self-contained-and-connected");
 909        if (options.cloning)
 910                argv_array_push(&args, "--cloning");
 911        if (options.update_shallow)
 912                argv_array_push(&args, "--update-shallow");
 913        if (!options.progress)
 914                argv_array_push(&args, "--no-progress");
 915        if (options.depth)
 916                argv_array_pushf(&args, "--depth=%lu", options.depth);
 917        if (options.deepen_since)
 918                argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since);
 919        for (i = 0; i < options.deepen_not.nr; i++)
 920                argv_array_pushf(&args, "--shallow-exclude=%s",
 921                                 options.deepen_not.items[i].string);
 922        if (options.deepen_relative && options.depth)
 923                argv_array_push(&args, "--deepen-relative");
 924        if (options.from_promisor)
 925                argv_array_push(&args, "--from-promisor");
 926        if (options.no_dependents)
 927                argv_array_push(&args, "--no-dependents");
 928        if (options.filter)
 929                argv_array_pushf(&args, "--filter=%s", options.filter);
 930        argv_array_push(&args, url.buf);
 931
 932        for (i = 0; i < nr_heads; i++) {
 933                struct ref *ref = to_fetch[i];
 934                if (!*ref->name)
 935                        die("cannot fetch by sha1 over smart http");
 936                packet_buf_write(&preamble, "%s %s\n",
 937                                 oid_to_hex(&ref->old_oid), ref->name);
 938        }
 939        packet_buf_flush(&preamble);
 940
 941        memset(&rpc, 0, sizeof(rpc));
 942        rpc.service_name = "git-upload-pack",
 943        rpc.argv = args.argv;
 944        rpc.stdin_preamble = &preamble;
 945        rpc.gzip_request = 1;
 946
 947        err = rpc_service(&rpc, heads);
 948        if (rpc.result.len)
 949                write_or_die(1, rpc.result.buf, rpc.result.len);
 950        strbuf_release(&rpc.result);
 951        strbuf_release(&preamble);
 952        argv_array_clear(&args);
 953        return err;
 954}
 955
 956static int fetch(int nr_heads, struct ref **to_fetch)
 957{
 958        struct discovery *d = discover_refs("git-upload-pack", 0);
 959        if (d->proto_git)
 960                return fetch_git(d, nr_heads, to_fetch);
 961        else
 962                return fetch_dumb(nr_heads, to_fetch);
 963}
 964
 965static void parse_fetch(struct strbuf *buf)
 966{
 967        struct ref **to_fetch = NULL;
 968        struct ref *list_head = NULL;
 969        struct ref **list = &list_head;
 970        int alloc_heads = 0, nr_heads = 0;
 971
 972        do {
 973                const char *p;
 974                if (skip_prefix(buf->buf, "fetch ", &p)) {
 975                        const char *name;
 976                        struct ref *ref;
 977                        struct object_id old_oid;
 978
 979                        if (get_oid_hex(p, &old_oid))
 980                                die("protocol error: expected sha/ref, got %s'", p);
 981                        if (p[GIT_SHA1_HEXSZ] == ' ')
 982                                name = p + GIT_SHA1_HEXSZ + 1;
 983                        else if (!p[GIT_SHA1_HEXSZ])
 984                                name = "";
 985                        else
 986                                die("protocol error: expected sha/ref, got %s'", p);
 987
 988                        ref = alloc_ref(name);
 989                        oidcpy(&ref->old_oid, &old_oid);
 990
 991                        *list = ref;
 992                        list = &ref->next;
 993
 994                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 995                        to_fetch[nr_heads++] = ref;
 996                }
 997                else
 998                        die("http transport does not support %s", buf->buf);
 999
1000                strbuf_reset(buf);
1001                if (strbuf_getline_lf(buf, stdin) == EOF)
1002                        return;
1003                if (!*buf->buf)
1004                        break;
1005        } while (1);
1006
1007        if (fetch(nr_heads, to_fetch))
1008                exit(128); /* error already reported */
1009        free_refs(list_head);
1010        free(to_fetch);
1011
1012        printf("\n");
1013        fflush(stdout);
1014        strbuf_reset(buf);
1015}
1016
1017static int push_dav(int nr_spec, char **specs)
1018{
1019        struct child_process child = CHILD_PROCESS_INIT;
1020        size_t i;
1021
1022        child.git_cmd = 1;
1023        argv_array_push(&child.args, "http-push");
1024        argv_array_push(&child.args, "--helper-status");
1025        if (options.dry_run)
1026                argv_array_push(&child.args, "--dry-run");
1027        if (options.verbosity > 1)
1028                argv_array_push(&child.args, "--verbose");
1029        argv_array_push(&child.args, url.buf);
1030        for (i = 0; i < nr_spec; i++)
1031                argv_array_push(&child.args, specs[i]);
1032
1033        if (run_command(&child))
1034                die("git-http-push failed");
1035        return 0;
1036}
1037
1038static int push_git(struct discovery *heads, int nr_spec, char **specs)
1039{
1040        struct rpc_state rpc;
1041        int i, err;
1042        struct argv_array args;
1043        struct string_list_item *cas_option;
1044        struct strbuf preamble = STRBUF_INIT;
1045
1046        argv_array_init(&args);
1047        argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
1048                         NULL);
1049
1050        if (options.thin)
1051                argv_array_push(&args, "--thin");
1052        if (options.dry_run)
1053                argv_array_push(&args, "--dry-run");
1054        if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
1055                argv_array_push(&args, "--signed=yes");
1056        else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
1057                argv_array_push(&args, "--signed=if-asked");
1058        if (options.verbosity == 0)
1059                argv_array_push(&args, "--quiet");
1060        else if (options.verbosity > 1)
1061                argv_array_push(&args, "--verbose");
1062        for (i = 0; i < options.push_options.nr; i++)
1063                argv_array_pushf(&args, "--push-option=%s",
1064                                 options.push_options.items[i].string);
1065        argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
1066        for_each_string_list_item(cas_option, &cas_options)
1067                argv_array_push(&args, cas_option->string);
1068        argv_array_push(&args, url.buf);
1069
1070        argv_array_push(&args, "--stdin");
1071        for (i = 0; i < nr_spec; i++)
1072                packet_buf_write(&preamble, "%s\n", specs[i]);
1073        packet_buf_flush(&preamble);
1074
1075        memset(&rpc, 0, sizeof(rpc));
1076        rpc.service_name = "git-receive-pack",
1077        rpc.argv = args.argv;
1078        rpc.stdin_preamble = &preamble;
1079
1080        err = rpc_service(&rpc, heads);
1081        if (rpc.result.len)
1082                write_or_die(1, rpc.result.buf, rpc.result.len);
1083        strbuf_release(&rpc.result);
1084        strbuf_release(&preamble);
1085        argv_array_clear(&args);
1086        return err;
1087}
1088
1089static int push(int nr_spec, char **specs)
1090{
1091        struct discovery *heads = discover_refs("git-receive-pack", 1);
1092        int ret;
1093
1094        if (heads->proto_git)
1095                ret = push_git(heads, nr_spec, specs);
1096        else
1097                ret = push_dav(nr_spec, specs);
1098        free_discovery(heads);
1099        return ret;
1100}
1101
1102static void parse_push(struct strbuf *buf)
1103{
1104        char **specs = NULL;
1105        int alloc_spec = 0, nr_spec = 0, i, ret;
1106
1107        do {
1108                if (starts_with(buf->buf, "push ")) {
1109                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
1110                        specs[nr_spec++] = xstrdup(buf->buf + 5);
1111                }
1112                else
1113                        die("http transport does not support %s", buf->buf);
1114
1115                strbuf_reset(buf);
1116                if (strbuf_getline_lf(buf, stdin) == EOF)
1117                        goto free_specs;
1118                if (!*buf->buf)
1119                        break;
1120        } while (1);
1121
1122        ret = push(nr_spec, specs);
1123        printf("\n");
1124        fflush(stdout);
1125
1126        if (ret)
1127                exit(128); /* error already reported */
1128
1129 free_specs:
1130        for (i = 0; i < nr_spec; i++)
1131                free(specs[i]);
1132        free(specs);
1133}
1134
1135/*
1136 * Used to represent the state of a connection to an HTTP server when
1137 * communicating using git's wire-protocol version 2.
1138 */
1139struct proxy_state {
1140        char *service_name;
1141        char *service_url;
1142        struct curl_slist *headers;
1143        struct strbuf request_buffer;
1144        int in;
1145        int out;
1146        struct packet_reader reader;
1147        size_t pos;
1148        int seen_flush;
1149};
1150
1151static void proxy_state_init(struct proxy_state *p, const char *service_name,
1152                             enum protocol_version version)
1153{
1154        struct strbuf buf = STRBUF_INIT;
1155
1156        memset(p, 0, sizeof(*p));
1157        p->service_name = xstrdup(service_name);
1158
1159        p->in = 0;
1160        p->out = 1;
1161        strbuf_init(&p->request_buffer, 0);
1162
1163        strbuf_addf(&buf, "%s%s", url.buf, p->service_name);
1164        p->service_url = strbuf_detach(&buf, NULL);
1165
1166        p->headers = http_copy_default_headers();
1167
1168        strbuf_addf(&buf, "Content-Type: application/x-%s-request", p->service_name);
1169        p->headers = curl_slist_append(p->headers, buf.buf);
1170        strbuf_reset(&buf);
1171
1172        strbuf_addf(&buf, "Accept: application/x-%s-result", p->service_name);
1173        p->headers = curl_slist_append(p->headers, buf.buf);
1174        strbuf_reset(&buf);
1175
1176        p->headers = curl_slist_append(p->headers, "Transfer-Encoding: chunked");
1177
1178        /* Add the Git-Protocol header */
1179        if (get_protocol_http_header(version, &buf))
1180                p->headers = curl_slist_append(p->headers, buf.buf);
1181
1182        packet_reader_init(&p->reader, p->in, NULL, 0,
1183                           PACKET_READ_GENTLE_ON_EOF);
1184
1185        strbuf_release(&buf);
1186}
1187
1188static void proxy_state_clear(struct proxy_state *p)
1189{
1190        free(p->service_name);
1191        free(p->service_url);
1192        curl_slist_free_all(p->headers);
1193        strbuf_release(&p->request_buffer);
1194}
1195
1196/*
1197 * CURLOPT_READFUNCTION callback function.
1198 * Attempts to copy over a single packet-line at a time into the
1199 * curl provided buffer.
1200 */
1201static size_t proxy_in(char *buffer, size_t eltsize,
1202                       size_t nmemb, void *userdata)
1203{
1204        size_t max;
1205        struct proxy_state *p = userdata;
1206        size_t avail = p->request_buffer.len - p->pos;
1207
1208
1209        if (eltsize != 1)
1210                BUG("curl read callback called with size = %"PRIuMAX" != 1",
1211                    (uintmax_t)eltsize);
1212        max = nmemb;
1213
1214        if (!avail) {
1215                if (p->seen_flush) {
1216                        p->seen_flush = 0;
1217                        return 0;
1218                }
1219
1220                strbuf_reset(&p->request_buffer);
1221                switch (packet_reader_read(&p->reader)) {
1222                case PACKET_READ_EOF:
1223                        die("unexpected EOF when reading from parent process");
1224                case PACKET_READ_NORMAL:
1225                        packet_buf_write_len(&p->request_buffer, p->reader.line,
1226                                             p->reader.pktlen);
1227                        break;
1228                case PACKET_READ_DELIM:
1229                        packet_buf_delim(&p->request_buffer);
1230                        break;
1231                case PACKET_READ_FLUSH:
1232                        packet_buf_flush(&p->request_buffer);
1233                        p->seen_flush = 1;
1234                        break;
1235                }
1236                p->pos = 0;
1237                avail = p->request_buffer.len;
1238        }
1239
1240        if (max < avail)
1241                avail = max;
1242        memcpy(buffer, p->request_buffer.buf + p->pos, avail);
1243        p->pos += avail;
1244        return avail;
1245}
1246
1247static size_t proxy_out(char *buffer, size_t eltsize,
1248                        size_t nmemb, void *userdata)
1249{
1250        size_t size;
1251        struct proxy_state *p = userdata;
1252
1253        if (eltsize != 1)
1254                BUG("curl read callback called with size = %"PRIuMAX" != 1",
1255                    (uintmax_t)eltsize);
1256        size = nmemb;
1257
1258        write_or_die(p->out, buffer, size);
1259        return size;
1260}
1261
1262/* Issues a request to the HTTP server configured in `p` */
1263static int proxy_request(struct proxy_state *p)
1264{
1265        struct active_request_slot *slot;
1266
1267        slot = get_active_slot();
1268
1269        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
1270        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1271        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
1272        curl_easy_setopt(slot->curl, CURLOPT_URL, p->service_url);
1273        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, p->headers);
1274
1275        /* Setup function to read request from client */
1276        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, proxy_in);
1277        curl_easy_setopt(slot->curl, CURLOPT_READDATA, p);
1278
1279        /* Setup function to write server response to client */
1280        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, proxy_out);
1281        curl_easy_setopt(slot->curl, CURLOPT_WRITEDATA, p);
1282
1283        if (run_slot(slot, NULL) != HTTP_OK)
1284                return -1;
1285
1286        return 0;
1287}
1288
1289static int stateless_connect(const char *service_name)
1290{
1291        struct discovery *discover;
1292        struct proxy_state p;
1293
1294        /*
1295         * Run the info/refs request and see if the server supports protocol
1296         * v2.  If and only if the server supports v2 can we successfully
1297         * establish a stateless connection, otherwise we need to tell the
1298         * client to fallback to using other transport helper functions to
1299         * complete their request.
1300         */
1301        discover = discover_refs(service_name, 0);
1302        if (discover->version != protocol_v2) {
1303                printf("fallback\n");
1304                fflush(stdout);
1305                return -1;
1306        } else {
1307                /* Stateless Connection established */
1308                printf("\n");
1309                fflush(stdout);
1310        }
1311
1312        proxy_state_init(&p, service_name, discover->version);
1313
1314        /*
1315         * Dump the capability listing that we got from the server earlier
1316         * during the info/refs request.
1317         */
1318        write_or_die(p.out, discover->buf, discover->len);
1319
1320        /* Peek the next packet line.  Until we see EOF keep sending POSTs */
1321        while (packet_reader_peek(&p.reader) != PACKET_READ_EOF) {
1322                if (proxy_request(&p)) {
1323                        /* We would have an err here */
1324                        break;
1325                }
1326        }
1327
1328        proxy_state_clear(&p);
1329        return 0;
1330}
1331
1332int cmd_main(int argc, const char **argv)
1333{
1334        struct strbuf buf = STRBUF_INIT;
1335        int nongit;
1336
1337        setup_git_directory_gently(&nongit);
1338        if (argc < 2) {
1339                error("remote-curl: usage: git remote-curl <remote> [<url>]");
1340                return 1;
1341        }
1342
1343        options.verbosity = 1;
1344        options.progress = !!isatty(2);
1345        options.thin = 1;
1346        string_list_init(&options.deepen_not, 1);
1347        string_list_init(&options.push_options, 1);
1348
1349        remote = remote_get(argv[1]);
1350
1351        if (argc > 2) {
1352                end_url_with_slash(&url, argv[2]);
1353        } else {
1354                end_url_with_slash(&url, remote->url[0]);
1355        }
1356
1357        http_init(remote, url.buf, 0);
1358
1359        do {
1360                const char *arg;
1361
1362                if (strbuf_getline_lf(&buf, stdin) == EOF) {
1363                        if (ferror(stdin))
1364                                error("remote-curl: error reading command stream from git");
1365                        return 1;
1366                }
1367                if (buf.len == 0)
1368                        break;
1369                if (starts_with(buf.buf, "fetch ")) {
1370                        if (nongit)
1371                                die("remote-curl: fetch attempted without a local repo");
1372                        parse_fetch(&buf);
1373
1374                } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1375                        int for_push = !!strstr(buf.buf + 4, "for-push");
1376                        output_refs(get_refs(for_push));
1377
1378                } else if (starts_with(buf.buf, "push ")) {
1379                        parse_push(&buf);
1380
1381                } else if (skip_prefix(buf.buf, "option ", &arg)) {
1382                        char *value = strchr(arg, ' ');
1383                        int result;
1384
1385                        if (value)
1386                                *value++ = '\0';
1387                        else
1388                                value = "true";
1389
1390                        result = set_option(arg, value);
1391                        if (!result)
1392                                printf("ok\n");
1393                        else if (result < 0)
1394                                printf("error invalid value\n");
1395                        else
1396                                printf("unsupported\n");
1397                        fflush(stdout);
1398
1399                } else if (!strcmp(buf.buf, "capabilities")) {
1400                        printf("stateless-connect\n");
1401                        printf("fetch\n");
1402                        printf("option\n");
1403                        printf("push\n");
1404                        printf("check-connectivity\n");
1405                        printf("\n");
1406                        fflush(stdout);
1407                } else if (skip_prefix(buf.buf, "stateless-connect ", &arg)) {
1408                        if (!stateless_connect(arg))
1409                                break;
1410                } else {
1411                        error("remote-curl: unknown command '%s' from git", buf.buf);
1412                        return 1;
1413                }
1414                strbuf_reset(&buf);
1415        } while (1);
1416
1417        http_cleanup();
1418
1419        return 0;
1420}