Andrew's git / gitweb.git / remote-curl.c
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remote-curl.con commit various: tighten constness of some local variables (33de80b)
   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
  20static struct remote *remote;
  21/* always ends with a trailing slash */
  22static struct strbuf url = STRBUF_INIT;
  23
  24struct options {
  25        int verbosity;
  26        unsigned long depth;
  27        char *deepen_since;
  28        struct string_list deepen_not;
  29        struct string_list push_options;
  30        char *filter;
  31        unsigned progress : 1,
  32                check_self_contained_and_connected : 1,
  33                cloning : 1,
  34                update_shallow : 1,
  35                followtags : 1,
  36                dry_run : 1,
  37                thin : 1,
  38                /* One of the SEND_PACK_PUSH_CERT_* constants. */
  39                push_cert : 2,
  40                deepen_relative : 1,
  41                from_promisor : 1,
  42                no_dependents : 1;
  43};
  44static struct options options;
  45static struct string_list cas_options = STRING_LIST_INIT_DUP;
  46
  47static int set_option(const char *name, const char *value)
  48{
  49        if (!strcmp(name, "verbosity")) {
  50                char *end;
  51                int v = strtol(value, &end, 10);
  52                if (value == end || *end)
  53                        return -1;
  54                options.verbosity = v;
  55                return 0;
  56        }
  57        else if (!strcmp(name, "progress")) {
  58                if (!strcmp(value, "true"))
  59                        options.progress = 1;
  60                else if (!strcmp(value, "false"))
  61                        options.progress = 0;
  62                else
  63                        return -1;
  64                return 0;
  65        }
  66        else if (!strcmp(name, "depth")) {
  67                char *end;
  68                unsigned long v = strtoul(value, &end, 10);
  69                if (value == end || *end)
  70                        return -1;
  71                options.depth = v;
  72                return 0;
  73        }
  74        else if (!strcmp(name, "deepen-since")) {
  75                options.deepen_since = xstrdup(value);
  76                return 0;
  77        }
  78        else if (!strcmp(name, "deepen-not")) {
  79                string_list_append(&options.deepen_not, value);
  80                return 0;
  81        }
  82        else if (!strcmp(name, "deepen-relative")) {
  83                if (!strcmp(value, "true"))
  84                        options.deepen_relative = 1;
  85                else if (!strcmp(value, "false"))
  86                        options.deepen_relative = 0;
  87                else
  88                        return -1;
  89                return 0;
  90        }
  91        else if (!strcmp(name, "followtags")) {
  92                if (!strcmp(value, "true"))
  93                        options.followtags = 1;
  94                else if (!strcmp(value, "false"))
  95                        options.followtags = 0;
  96                else
  97                        return -1;
  98                return 0;
  99        }
 100        else if (!strcmp(name, "dry-run")) {
 101                if (!strcmp(value, "true"))
 102                        options.dry_run = 1;
 103                else if (!strcmp(value, "false"))
 104                        options.dry_run = 0;
 105                else
 106                        return -1;
 107                return 0;
 108        }
 109        else if (!strcmp(name, "check-connectivity")) {
 110                if (!strcmp(value, "true"))
 111                        options.check_self_contained_and_connected = 1;
 112                else if (!strcmp(value, "false"))
 113                        options.check_self_contained_and_connected = 0;
 114                else
 115                        return -1;
 116                return 0;
 117        }
 118        else if (!strcmp(name, "cas")) {
 119                struct strbuf val = STRBUF_INIT;
 120                strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
 121                string_list_append(&cas_options, val.buf);
 122                strbuf_release(&val);
 123                return 0;
 124        } else if (!strcmp(name, "cloning")) {
 125                if (!strcmp(value, "true"))
 126                        options.cloning = 1;
 127                else if (!strcmp(value, "false"))
 128                        options.cloning = 0;
 129                else
 130                        return -1;
 131                return 0;
 132        } else if (!strcmp(name, "update-shallow")) {
 133                if (!strcmp(value, "true"))
 134                        options.update_shallow = 1;
 135                else if (!strcmp(value, "false"))
 136                        options.update_shallow = 0;
 137                else
 138                        return -1;
 139                return 0;
 140        } else if (!strcmp(name, "pushcert")) {
 141                if (!strcmp(value, "true"))
 142                        options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 143                else if (!strcmp(value, "false"))
 144                        options.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 145                else if (!strcmp(value, "if-asked"))
 146                        options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 147                else
 148                        return -1;
 149                return 0;
 150        } else if (!strcmp(name, "push-option")) {
 151                if (*value != '"')
 152                        string_list_append(&options.push_options, value);
 153                else {
 154                        struct strbuf unquoted = STRBUF_INIT;
 155                        if (unquote_c_style(&unquoted, value, NULL) < 0)
 156                                die("invalid quoting in push-option value");
 157                        string_list_append_nodup(&options.push_options,
 158                                                 strbuf_detach(&unquoted, NULL));
 159                }
 160                return 0;
 161
 162#if LIBCURL_VERSION_NUM >= 0x070a08
 163        } else if (!strcmp(name, "family")) {
 164                if (!strcmp(value, "ipv4"))
 165                        git_curl_ipresolve = CURL_IPRESOLVE_V4;
 166                else if (!strcmp(value, "ipv6"))
 167                        git_curl_ipresolve = CURL_IPRESOLVE_V6;
 168                else if (!strcmp(value, "all"))
 169                        git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
 170                else
 171                        return -1;
 172                return 0;
 173#endif /* LIBCURL_VERSION_NUM >= 0x070a08 */
 174        } else if (!strcmp(name, "from-promisor")) {
 175                options.from_promisor = 1;
 176                return 0;
 177        } else if (!strcmp(name, "no-dependents")) {
 178                options.no_dependents = 1;
 179                return 0;
 180        } else if (!strcmp(name, "filter")) {
 181                options.filter = xstrdup(value);
 182                return 0;
 183        } else {
 184                return 1 /* unsupported */;
 185        }
 186}
 187
 188struct discovery {
 189        char *service;
 190        char *buf_alloc;
 191        char *buf;
 192        size_t len;
 193        struct ref *refs;
 194        struct oid_array shallow;
 195        enum protocol_version version;
 196        unsigned proto_git : 1;
 197};
 198static struct discovery *last_discovery;
 199
 200static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 201{
 202        struct ref *list = NULL;
 203        struct packet_reader reader;
 204
 205        packet_reader_init(&reader, -1, heads->buf, heads->len,
 206                           PACKET_READ_CHOMP_NEWLINE |
 207                           PACKET_READ_GENTLE_ON_EOF);
 208
 209        heads->version = discover_version(&reader);
 210        switch (heads->version) {
 211        case protocol_v2:
 212                /*
 213                 * Do nothing.  This isn't a list of refs but rather a
 214                 * capability advertisement.  Client would have run
 215                 * 'stateless-connect' so we'll dump this capability listing
 216                 * and let them request the refs themselves.
 217                 */
 218                break;
 219        case protocol_v1:
 220        case protocol_v0:
 221                get_remote_heads(&reader, &list, for_push ? REF_NORMAL : 0,
 222                                 NULL, &heads->shallow);
 223                break;
 224        case protocol_unknown_version:
 225                BUG("unknown protocol version");
 226        }
 227
 228        return list;
 229}
 230
 231static struct ref *parse_info_refs(struct discovery *heads)
 232{
 233        char *data, *start, *mid;
 234        char *ref_name;
 235        int i = 0;
 236
 237        struct ref *refs = NULL;
 238        struct ref *ref = NULL;
 239        struct ref *last_ref = NULL;
 240
 241        data = heads->buf;
 242        start = NULL;
 243        mid = data;
 244        while (i < heads->len) {
 245                if (!start) {
 246                        start = &data[i];
 247                }
 248                if (data[i] == '\t')
 249                        mid = &data[i];
 250                if (data[i] == '\n') {
 251                        if (mid - start != 40)
 252                                die("%sinfo/refs not valid: is this a git repository?",
 253                                    url.buf);
 254                        data[i] = 0;
 255                        ref_name = mid + 1;
 256                        ref = alloc_ref(ref_name);
 257                        get_oid_hex(start, &ref->old_oid);
 258                        if (!refs)
 259                                refs = ref;
 260                        if (last_ref)
 261                                last_ref->next = ref;
 262                        last_ref = ref;
 263                        start = NULL;
 264                }
 265                i++;
 266        }
 267
 268        ref = alloc_ref("HEAD");
 269        if (!http_fetch_ref(url.buf, ref) &&
 270            !resolve_remote_symref(ref, refs)) {
 271                ref->next = refs;
 272                refs = ref;
 273        } else {
 274                free(ref);
 275        }
 276
 277        return refs;
 278}
 279
 280static void free_discovery(struct discovery *d)
 281{
 282        if (d) {
 283                if (d == last_discovery)
 284                        last_discovery = NULL;
 285                free(d->shallow.oid);
 286                free(d->buf_alloc);
 287                free_refs(d->refs);
 288                free(d->service);
 289                free(d);
 290        }
 291}
 292
 293static int show_http_message(struct strbuf *type, struct strbuf *charset,
 294                             struct strbuf *msg)
 295{
 296        const char *p, *eol;
 297
 298        /*
 299         * We only show text/plain parts, as other types are likely
 300         * to be ugly to look at on the user's terminal.
 301         */
 302        if (strcmp(type->buf, "text/plain"))
 303                return -1;
 304        if (charset->len)
 305                strbuf_reencode(msg, charset->buf, get_log_output_encoding());
 306
 307        strbuf_trim(msg);
 308        if (!msg->len)
 309                return -1;
 310
 311        p = msg->buf;
 312        do {
 313                eol = strchrnul(p, '\n');
 314                fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 315                p = eol + 1;
 316        } while(*eol);
 317        return 0;
 318}
 319
 320static int get_protocol_http_header(enum protocol_version version,
 321                                    struct strbuf *header)
 322{
 323        if (version > 0) {
 324                strbuf_addf(header, GIT_PROTOCOL_HEADER ": version=%d",
 325                            version);
 326
 327                return 1;
 328        }
 329
 330        return 0;
 331}
 332
 333static struct discovery *discover_refs(const char *service, int for_push)
 334{
 335        struct strbuf exp = STRBUF_INIT;
 336        struct strbuf type = STRBUF_INIT;
 337        struct strbuf charset = STRBUF_INIT;
 338        struct strbuf buffer = STRBUF_INIT;
 339        struct strbuf refs_url = STRBUF_INIT;
 340        struct strbuf effective_url = STRBUF_INIT;
 341        struct strbuf protocol_header = STRBUF_INIT;
 342        struct string_list extra_headers = STRING_LIST_INIT_DUP;
 343        struct discovery *last = last_discovery;
 344        int http_ret, maybe_smart = 0;
 345        struct http_get_options http_options;
 346        enum protocol_version version = get_protocol_version_config();
 347
 348        if (last && !strcmp(service, last->service))
 349                return last;
 350        free_discovery(last);
 351
 352        strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 353        if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 354             git_env_bool("GIT_SMART_HTTP", 1)) {
 355                maybe_smart = 1;
 356                if (!strchr(url.buf, '?'))
 357                        strbuf_addch(&refs_url, '?');
 358                else
 359                        strbuf_addch(&refs_url, '&');
 360                strbuf_addf(&refs_url, "service=%s", service);
 361        }
 362
 363        /*
 364         * NEEDSWORK: If we are trying to use protocol v2 and we are planning
 365         * to perform a push, then fallback to v0 since the client doesn't know
 366         * how to push yet using v2.
 367         */
 368        if (version == protocol_v2 && !strcmp("git-receive-pack", service))
 369                version = protocol_v0;
 370
 371        /* Add the extra Git-Protocol header */
 372        if (get_protocol_http_header(version, &protocol_header))
 373                string_list_append(&extra_headers, protocol_header.buf);
 374
 375        memset(&http_options, 0, sizeof(http_options));
 376        http_options.content_type = &type;
 377        http_options.charset = &charset;
 378        http_options.effective_url = &effective_url;
 379        http_options.base_url = &url;
 380        http_options.extra_headers = &extra_headers;
 381        http_options.initial_request = 1;
 382        http_options.no_cache = 1;
 383
 384        http_ret = http_get_strbuf(refs_url.buf, &buffer, &http_options);
 385        switch (http_ret) {
 386        case HTTP_OK:
 387                break;
 388        case HTTP_MISSING_TARGET:
 389                show_http_message(&type, &charset, &buffer);
 390                die("repository '%s' not found", url.buf);
 391        case HTTP_NOAUTH:
 392                show_http_message(&type, &charset, &buffer);
 393                die("Authentication failed for '%s'", url.buf);
 394        default:
 395                show_http_message(&type, &charset, &buffer);
 396                die("unable to access '%s': %s", url.buf, curl_errorstr);
 397        }
 398
 399        if (options.verbosity && !starts_with(refs_url.buf, url.buf))
 400                warning(_("redirecting to %s"), url.buf);
 401
 402        last= xcalloc(1, sizeof(*last_discovery));
 403        last->service = xstrdup(service);
 404        last->buf_alloc = strbuf_detach(&buffer, &last->len);
 405        last->buf = last->buf_alloc;
 406
 407        strbuf_addf(&exp, "application/x-%s-advertisement", service);
 408        if (maybe_smart &&
 409            (5 <= last->len && last->buf[4] == '#') &&
 410            !strbuf_cmp(&exp, &type)) {
 411                char *line;
 412
 413                /*
 414                 * smart HTTP response; validate that the service
 415                 * pkt-line matches our request.
 416                 */
 417                line = packet_read_line_buf(&last->buf, &last->len, NULL);
 418                if (!line)
 419                        die("invalid server response; expected service, got flush packet");
 420
 421                strbuf_reset(&exp);
 422                strbuf_addf(&exp, "# service=%s", service);
 423                if (strcmp(line, exp.buf))
 424                        die("invalid server response; got '%s'", line);
 425                strbuf_release(&exp);
 426
 427                /* The header can include additional metadata lines, up
 428                 * until a packet flush marker.  Ignore these now, but
 429                 * in the future we might start to scan them.
 430                 */
 431                while (packet_read_line_buf(&last->buf, &last->len, NULL))
 432                        ;
 433
 434                last->proto_git = 1;
 435        } else if (maybe_smart &&
 436                   last->len > 5 && starts_with(last->buf + 4, "version 2")) {
 437                last->proto_git = 1;
 438        }
 439
 440        if (last->proto_git)
 441                last->refs = parse_git_refs(last, for_push);
 442        else
 443                last->refs = parse_info_refs(last);
 444
 445        strbuf_release(&refs_url);
 446        strbuf_release(&exp);
 447        strbuf_release(&type);
 448        strbuf_release(&charset);
 449        strbuf_release(&effective_url);
 450        strbuf_release(&buffer);
 451        strbuf_release(&protocol_header);
 452        string_list_clear(&extra_headers, 0);
 453        last_discovery = last;
 454        return last;
 455}
 456
 457static struct ref *get_refs(int for_push)
 458{
 459        struct discovery *heads;
 460
 461        if (for_push)
 462                heads = discover_refs("git-receive-pack", for_push);
 463        else
 464                heads = discover_refs("git-upload-pack", for_push);
 465
 466        return heads->refs;
 467}
 468
 469static void output_refs(struct ref *refs)
 470{
 471        struct ref *posn;
 472        for (posn = refs; posn; posn = posn->next) {
 473                if (posn->symref)
 474                        printf("@%s %s\n", posn->symref, posn->name);
 475                else
 476                        printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name);
 477        }
 478        printf("\n");
 479        fflush(stdout);
 480}
 481
 482struct rpc_state {
 483        const char *service_name;
 484        const char **argv;
 485        struct strbuf *stdin_preamble;
 486        char *service_url;
 487        char *hdr_content_type;
 488        char *hdr_accept;
 489        char *protocol_header;
 490        char *buf;
 491        size_t alloc;
 492        size_t len;
 493        size_t pos;
 494        int in;
 495        int out;
 496        int any_written;
 497        struct strbuf result;
 498        unsigned gzip_request : 1;
 499        unsigned initial_buffer : 1;
 500};
 501
 502static size_t rpc_out(void *ptr, size_t eltsize,
 503                size_t nmemb, void *buffer_)
 504{
 505        size_t max = eltsize * nmemb;
 506        struct rpc_state *rpc = buffer_;
 507        size_t avail = rpc->len - rpc->pos;
 508
 509        if (!avail) {
 510                rpc->initial_buffer = 0;
 511                avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 512                if (!avail)
 513                        return 0;
 514                rpc->pos = 0;
 515                rpc->len = avail;
 516        }
 517
 518        if (max < avail)
 519                avail = max;
 520        memcpy(ptr, rpc->buf + rpc->pos, avail);
 521        rpc->pos += avail;
 522        return avail;
 523}
 524
 525#ifndef NO_CURL_IOCTL
 526static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 527{
 528        struct rpc_state *rpc = clientp;
 529
 530        switch (cmd) {
 531        case CURLIOCMD_NOP:
 532                return CURLIOE_OK;
 533
 534        case CURLIOCMD_RESTARTREAD:
 535                if (rpc->initial_buffer) {
 536                        rpc->pos = 0;
 537                        return CURLIOE_OK;
 538                }
 539                error("unable to rewind rpc post data - try increasing http.postBuffer");
 540                return CURLIOE_FAILRESTART;
 541
 542        default:
 543                return CURLIOE_UNKNOWNCMD;
 544        }
 545}
 546#endif
 547
 548struct rpc_in_data {
 549        struct rpc_state *rpc;
 550        struct active_request_slot *slot;
 551};
 552
 553/*
 554 * A callback for CURLOPT_WRITEFUNCTION. The return value is the bytes consumed
 555 * from ptr.
 556 */
 557static size_t rpc_in(char *ptr, size_t eltsize,
 558                size_t nmemb, void *buffer_)
 559{
 560        size_t size = eltsize * nmemb;
 561        struct rpc_in_data *data = buffer_;
 562        long response_code;
 563
 564        if (curl_easy_getinfo(data->slot->curl, CURLINFO_RESPONSE_CODE,
 565                              &response_code) != CURLE_OK)
 566                return size;
 567        if (response_code >= 300)
 568                return size;
 569        if (size)
 570                data->rpc->any_written = 1;
 571        write_or_die(data->rpc->in, ptr, size);
 572        return size;
 573}
 574
 575static int run_slot(struct active_request_slot *slot,
 576                    struct slot_results *results)
 577{
 578        int err;
 579        struct slot_results results_buf;
 580
 581        if (!results)
 582                results = &results_buf;
 583
 584        err = run_one_slot(slot, results);
 585
 586        if (err != HTTP_OK && err != HTTP_REAUTH) {
 587                struct strbuf msg = STRBUF_INIT;
 588                if (results->http_code && results->http_code != 200)
 589                        strbuf_addf(&msg, "HTTP %ld", results->http_code);
 590                if (results->curl_result != CURLE_OK) {
 591                        if (msg.len)
 592                                strbuf_addch(&msg, ' ');
 593                        strbuf_addf(&msg, "curl %d", results->curl_result);
 594                        if (curl_errorstr[0]) {
 595                                strbuf_addch(&msg, ' ');
 596                                strbuf_addstr(&msg, curl_errorstr);
 597                        }
 598                }
 599                error("RPC failed; %s", msg.buf);
 600                strbuf_release(&msg);
 601        }
 602
 603        return err;
 604}
 605
 606static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 607{
 608        struct active_request_slot *slot;
 609        struct curl_slist *headers = http_copy_default_headers();
 610        struct strbuf buf = STRBUF_INIT;
 611        int err;
 612
 613        slot = get_active_slot();
 614
 615        headers = curl_slist_append(headers, rpc->hdr_content_type);
 616        headers = curl_slist_append(headers, rpc->hdr_accept);
 617
 618        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 619        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 620        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 621        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 622        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 623        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 624        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 625        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 626        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 627
 628        err = run_slot(slot, results);
 629
 630        curl_slist_free_all(headers);
 631        strbuf_release(&buf);
 632        return err;
 633}
 634
 635static curl_off_t xcurl_off_t(size_t len)
 636{
 637        uintmax_t size = len;
 638        if (size > maximum_signed_value_of_type(curl_off_t))
 639                die("cannot handle pushes this big");
 640        return (curl_off_t)size;
 641}
 642
 643static int post_rpc(struct rpc_state *rpc)
 644{
 645        struct active_request_slot *slot;
 646        struct curl_slist *headers = http_copy_default_headers();
 647        int use_gzip = rpc->gzip_request;
 648        char *gzip_body = NULL;
 649        size_t gzip_size = 0;
 650        int err, large_request = 0;
 651        int needs_100_continue = 0;
 652        struct rpc_in_data rpc_in_data;
 653
 654        /* Try to load the entire request, if we can fit it into the
 655         * allocated buffer space we can use HTTP/1.0 and avoid the
 656         * chunked encoding mess.
 657         */
 658        while (1) {
 659                size_t left = rpc->alloc - rpc->len;
 660                char *buf = rpc->buf + rpc->len;
 661                int n;
 662
 663                if (left < LARGE_PACKET_MAX) {
 664                        large_request = 1;
 665                        use_gzip = 0;
 666                        break;
 667                }
 668
 669                n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 670                if (!n)
 671                        break;
 672                rpc->len += n;
 673        }
 674
 675        if (large_request) {
 676                struct slot_results results;
 677
 678                do {
 679                        err = probe_rpc(rpc, &results);
 680                        if (err == HTTP_REAUTH)
 681                                credential_fill(&http_auth);
 682                } while (err == HTTP_REAUTH);
 683                if (err != HTTP_OK)
 684                        return -1;
 685
 686                if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 687                        needs_100_continue = 1;
 688        }
 689
 690        headers = curl_slist_append(headers, rpc->hdr_content_type);
 691        headers = curl_slist_append(headers, rpc->hdr_accept);
 692        headers = curl_slist_append(headers, needs_100_continue ?
 693                "Expect: 100-continue" : "Expect:");
 694
 695        /* Add the extra Git-Protocol header */
 696        if (rpc->protocol_header)
 697                headers = curl_slist_append(headers, rpc->protocol_header);
 698
 699retry:
 700        slot = get_active_slot();
 701
 702        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 703        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 704        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 705        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 706
 707        if (large_request) {
 708                /* The request body is large and the size cannot be predicted.
 709                 * We must use chunked encoding to send it.
 710                 */
 711                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 712                rpc->initial_buffer = 1;
 713                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 714                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 715#ifndef NO_CURL_IOCTL
 716                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 717                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 718#endif
 719                if (options.verbosity > 1) {
 720                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 721                        fflush(stderr);
 722                }
 723
 724        } else if (gzip_body) {
 725                /*
 726                 * If we are looping to retry authentication, then the previous
 727                 * run will have set up the headers and gzip buffer already,
 728                 * and we just need to send it.
 729                 */
 730                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 731                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 732
 733        } else if (use_gzip && 1024 < rpc->len) {
 734                /* The client backend isn't giving us compressed data so
 735                 * we can try to deflate it ourselves, this may save on
 736                 * the transfer time.
 737                 */
 738                git_zstream stream;
 739                int ret;
 740
 741                git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 742                gzip_size = git_deflate_bound(&stream, rpc->len);
 743                gzip_body = xmalloc(gzip_size);
 744
 745                stream.next_in = (unsigned char *)rpc->buf;
 746                stream.avail_in = rpc->len;
 747                stream.next_out = (unsigned char *)gzip_body;
 748                stream.avail_out = gzip_size;
 749
 750                ret = git_deflate(&stream, Z_FINISH);
 751                if (ret != Z_STREAM_END)
 752                        die("cannot deflate request; zlib deflate error %d", ret);
 753
 754                ret = git_deflate_end_gently(&stream);
 755                if (ret != Z_OK)
 756                        die("cannot deflate request; zlib end error %d", ret);
 757
 758                gzip_size = stream.total_out;
 759
 760                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 761                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 762                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 763
 764                if (options.verbosity > 1) {
 765                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 766                                rpc->service_name,
 767                                (unsigned long)rpc->len, (unsigned long)gzip_size);
 768                        fflush(stderr);
 769                }
 770        } else {
 771                /* We know the complete request size in advance, use the
 772                 * more normal Content-Length approach.
 773                 */
 774                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 775                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(rpc->len));
 776                if (options.verbosity > 1) {
 777                        fprintf(stderr, "POST %s (%lu bytes)\n",
 778                                rpc->service_name, (unsigned long)rpc->len);
 779                        fflush(stderr);
 780                }
 781        }
 782
 783        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 784        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 785        rpc_in_data.rpc = rpc;
 786        rpc_in_data.slot = slot;
 787        curl_easy_setopt(slot->curl, CURLOPT_FILE, &rpc_in_data);
 788        curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
 789
 790
 791        rpc->any_written = 0;
 792        err = run_slot(slot, NULL);
 793        if (err == HTTP_REAUTH && !large_request) {
 794                credential_fill(&http_auth);
 795                goto retry;
 796        }
 797        if (err != HTTP_OK)
 798                err = -1;
 799
 800        if (!rpc->any_written)
 801                err = -1;
 802
 803        curl_slist_free_all(headers);
 804        free(gzip_body);
 805        return err;
 806}
 807
 808static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 809{
 810        const char *svc = rpc->service_name;
 811        struct strbuf buf = STRBUF_INIT;
 812        struct strbuf *preamble = rpc->stdin_preamble;
 813        struct child_process client = CHILD_PROCESS_INIT;
 814        int err = 0;
 815
 816        client.in = -1;
 817        client.out = -1;
 818        client.git_cmd = 1;
 819        client.argv = rpc->argv;
 820        if (start_command(&client))
 821                exit(1);
 822        if (preamble)
 823                write_or_die(client.in, preamble->buf, preamble->len);
 824        if (heads)
 825                write_or_die(client.in, heads->buf, heads->len);
 826
 827        rpc->alloc = http_post_buffer;
 828        rpc->buf = xmalloc(rpc->alloc);
 829        rpc->in = client.in;
 830        rpc->out = client.out;
 831        strbuf_init(&rpc->result, 0);
 832
 833        strbuf_addf(&buf, "%s%s", url.buf, svc);
 834        rpc->service_url = strbuf_detach(&buf, NULL);
 835
 836        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 837        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 838
 839        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 840        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 841
 842        if (get_protocol_http_header(heads->version, &buf))
 843                rpc->protocol_header = strbuf_detach(&buf, NULL);
 844        else
 845                rpc->protocol_header = NULL;
 846
 847        while (!err) {
 848                int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 849                if (!n)
 850                        break;
 851                rpc->pos = 0;
 852                rpc->len = n;
 853                err |= post_rpc(rpc);
 854        }
 855
 856        close(client.in);
 857        client.in = -1;
 858        if (!err) {
 859                strbuf_read(&rpc->result, client.out, 0);
 860        } else {
 861                char buf[4096];
 862                for (;;)
 863                        if (xread(client.out, buf, sizeof(buf)) <= 0)
 864                                break;
 865        }
 866
 867        close(client.out);
 868        client.out = -1;
 869
 870        err |= finish_command(&client);
 871        free(rpc->service_url);
 872        free(rpc->hdr_content_type);
 873        free(rpc->hdr_accept);
 874        free(rpc->protocol_header);
 875        free(rpc->buf);
 876        strbuf_release(&buf);
 877        return err;
 878}
 879
 880static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 881{
 882        struct walker *walker;
 883        char **targets;
 884        int ret, i;
 885
 886        ALLOC_ARRAY(targets, nr_heads);
 887        if (options.depth || options.deepen_since)
 888                die("dumb http transport does not support shallow capabilities");
 889        for (i = 0; i < nr_heads; i++)
 890                targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
 891
 892        walker = get_http_walker(url.buf);
 893        walker->get_verbosely = options.verbosity >= 3;
 894        walker->get_recover = 0;
 895        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 896        walker_free(walker);
 897
 898        for (i = 0; i < nr_heads; i++)
 899                free(targets[i]);
 900        free(targets);
 901
 902        return ret ? error("fetch failed.") : 0;
 903}
 904
 905static int fetch_git(struct discovery *heads,
 906        int nr_heads, struct ref **to_fetch)
 907{
 908        struct rpc_state rpc;
 909        struct strbuf preamble = STRBUF_INIT;
 910        int i, err;
 911        struct argv_array args = ARGV_ARRAY_INIT;
 912
 913        argv_array_pushl(&args, "fetch-pack", "--stateless-rpc",
 914                         "--stdin", "--lock-pack", NULL);
 915        if (options.followtags)
 916                argv_array_push(&args, "--include-tag");
 917        if (options.thin)
 918                argv_array_push(&args, "--thin");
 919        if (options.verbosity >= 3)
 920                argv_array_pushl(&args, "-v", "-v", NULL);
 921        if (options.check_self_contained_and_connected)
 922                argv_array_push(&args, "--check-self-contained-and-connected");
 923        if (options.cloning)
 924                argv_array_push(&args, "--cloning");
 925        if (options.update_shallow)
 926                argv_array_push(&args, "--update-shallow");
 927        if (!options.progress)
 928                argv_array_push(&args, "--no-progress");
 929        if (options.depth)
 930                argv_array_pushf(&args, "--depth=%lu", options.depth);
 931        if (options.deepen_since)
 932                argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since);
 933        for (i = 0; i < options.deepen_not.nr; i++)
 934                argv_array_pushf(&args, "--shallow-exclude=%s",
 935                                 options.deepen_not.items[i].string);
 936        if (options.deepen_relative && options.depth)
 937                argv_array_push(&args, "--deepen-relative");
 938        if (options.from_promisor)
 939                argv_array_push(&args, "--from-promisor");
 940        if (options.no_dependents)
 941                argv_array_push(&args, "--no-dependents");
 942        if (options.filter)
 943                argv_array_pushf(&args, "--filter=%s", options.filter);
 944        argv_array_push(&args, url.buf);
 945
 946        for (i = 0; i < nr_heads; i++) {
 947                struct ref *ref = to_fetch[i];
 948                if (!*ref->name)
 949                        die("cannot fetch by sha1 over smart http");
 950                packet_buf_write(&preamble, "%s %s\n",
 951                                 oid_to_hex(&ref->old_oid), ref->name);
 952        }
 953        packet_buf_flush(&preamble);
 954
 955        memset(&rpc, 0, sizeof(rpc));
 956        rpc.service_name = "git-upload-pack",
 957        rpc.argv = args.argv;
 958        rpc.stdin_preamble = &preamble;
 959        rpc.gzip_request = 1;
 960
 961        err = rpc_service(&rpc, heads);
 962        if (rpc.result.len)
 963                write_or_die(1, rpc.result.buf, rpc.result.len);
 964        strbuf_release(&rpc.result);
 965        strbuf_release(&preamble);
 966        argv_array_clear(&args);
 967        return err;
 968}
 969
 970static int fetch(int nr_heads, struct ref **to_fetch)
 971{
 972        struct discovery *d = discover_refs("git-upload-pack", 0);
 973        if (d->proto_git)
 974                return fetch_git(d, nr_heads, to_fetch);
 975        else
 976                return fetch_dumb(nr_heads, to_fetch);
 977}
 978
 979static void parse_fetch(struct strbuf *buf)
 980{
 981        struct ref **to_fetch = NULL;
 982        struct ref *list_head = NULL;
 983        struct ref **list = &list_head;
 984        int alloc_heads = 0, nr_heads = 0;
 985
 986        do {
 987                const char *p;
 988                if (skip_prefix(buf->buf, "fetch ", &p)) {
 989                        const char *name;
 990                        struct ref *ref;
 991                        struct object_id old_oid;
 992
 993                        if (get_oid_hex(p, &old_oid))
 994                                die("protocol error: expected sha/ref, got %s'", p);
 995                        if (p[GIT_SHA1_HEXSZ] == ' ')
 996                                name = p + GIT_SHA1_HEXSZ + 1;
 997                        else if (!p[GIT_SHA1_HEXSZ])
 998                                name = "";
 999                        else
1000                                die("protocol error: expected sha/ref, got %s'", p);
1001
1002                        ref = alloc_ref(name);
1003                        oidcpy(&ref->old_oid, &old_oid);
1004
1005                        *list = ref;
1006                        list = &ref->next;
1007
1008                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
1009                        to_fetch[nr_heads++] = ref;
1010                }
1011                else
1012                        die("http transport does not support %s", buf->buf);
1013
1014                strbuf_reset(buf);
1015                if (strbuf_getline_lf(buf, stdin) == EOF)
1016                        return;
1017                if (!*buf->buf)
1018                        break;
1019        } while (1);
1020
1021        if (fetch(nr_heads, to_fetch))
1022                exit(128); /* error already reported */
1023        free_refs(list_head);
1024        free(to_fetch);
1025
1026        printf("\n");
1027        fflush(stdout);
1028        strbuf_reset(buf);
1029}
1030
1031static int push_dav(int nr_spec, char **specs)
1032{
1033        struct child_process child = CHILD_PROCESS_INIT;
1034        size_t i;
1035
1036        child.git_cmd = 1;
1037        argv_array_push(&child.args, "http-push");
1038        argv_array_push(&child.args, "--helper-status");
1039        if (options.dry_run)
1040                argv_array_push(&child.args, "--dry-run");
1041        if (options.verbosity > 1)
1042                argv_array_push(&child.args, "--verbose");
1043        argv_array_push(&child.args, url.buf);
1044        for (i = 0; i < nr_spec; i++)
1045                argv_array_push(&child.args, specs[i]);
1046
1047        if (run_command(&child))
1048                die("git-http-push failed");
1049        return 0;
1050}
1051
1052static int push_git(struct discovery *heads, int nr_spec, char **specs)
1053{
1054        struct rpc_state rpc;
1055        int i, err;
1056        struct argv_array args;
1057        struct string_list_item *cas_option;
1058        struct strbuf preamble = STRBUF_INIT;
1059
1060        argv_array_init(&args);
1061        argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
1062                         NULL);
1063
1064        if (options.thin)
1065                argv_array_push(&args, "--thin");
1066        if (options.dry_run)
1067                argv_array_push(&args, "--dry-run");
1068        if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
1069                argv_array_push(&args, "--signed=yes");
1070        else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
1071                argv_array_push(&args, "--signed=if-asked");
1072        if (options.verbosity == 0)
1073                argv_array_push(&args, "--quiet");
1074        else if (options.verbosity > 1)
1075                argv_array_push(&args, "--verbose");
1076        for (i = 0; i < options.push_options.nr; i++)
1077                argv_array_pushf(&args, "--push-option=%s",
1078                                 options.push_options.items[i].string);
1079        argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
1080        for_each_string_list_item(cas_option, &cas_options)
1081                argv_array_push(&args, cas_option->string);
1082        argv_array_push(&args, url.buf);
1083
1084        argv_array_push(&args, "--stdin");
1085        for (i = 0; i < nr_spec; i++)
1086                packet_buf_write(&preamble, "%s\n", specs[i]);
1087        packet_buf_flush(&preamble);
1088
1089        memset(&rpc, 0, sizeof(rpc));
1090        rpc.service_name = "git-receive-pack",
1091        rpc.argv = args.argv;
1092        rpc.stdin_preamble = &preamble;
1093
1094        err = rpc_service(&rpc, heads);
1095        if (rpc.result.len)
1096                write_or_die(1, rpc.result.buf, rpc.result.len);
1097        strbuf_release(&rpc.result);
1098        strbuf_release(&preamble);
1099        argv_array_clear(&args);
1100        return err;
1101}
1102
1103static int push(int nr_spec, char **specs)
1104{
1105        struct discovery *heads = discover_refs("git-receive-pack", 1);
1106        int ret;
1107
1108        if (heads->proto_git)
1109                ret = push_git(heads, nr_spec, specs);
1110        else
1111                ret = push_dav(nr_spec, specs);
1112        free_discovery(heads);
1113        return ret;
1114}
1115
1116static void parse_push(struct strbuf *buf)
1117{
1118        char **specs = NULL;
1119        int alloc_spec = 0, nr_spec = 0, i, ret;
1120
1121        do {
1122                if (starts_with(buf->buf, "push ")) {
1123                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
1124                        specs[nr_spec++] = xstrdup(buf->buf + 5);
1125                }
1126                else
1127                        die("http transport does not support %s", buf->buf);
1128
1129                strbuf_reset(buf);
1130                if (strbuf_getline_lf(buf, stdin) == EOF)
1131                        goto free_specs;
1132                if (!*buf->buf)
1133                        break;
1134        } while (1);
1135
1136        ret = push(nr_spec, specs);
1137        printf("\n");
1138        fflush(stdout);
1139
1140        if (ret)
1141                exit(128); /* error already reported */
1142
1143 free_specs:
1144        for (i = 0; i < nr_spec; i++)
1145                free(specs[i]);
1146        free(specs);
1147}
1148
1149/*
1150 * Used to represent the state of a connection to an HTTP server when
1151 * communicating using git's wire-protocol version 2.
1152 */
1153struct proxy_state {
1154        char *service_name;
1155        char *service_url;
1156        struct curl_slist *headers;
1157        struct strbuf request_buffer;
1158        int in;
1159        int out;
1160        struct packet_reader reader;
1161        size_t pos;
1162        int seen_flush;
1163};
1164
1165static void proxy_state_init(struct proxy_state *p, const char *service_name,
1166                             enum protocol_version version)
1167{
1168        struct strbuf buf = STRBUF_INIT;
1169
1170        memset(p, 0, sizeof(*p));
1171        p->service_name = xstrdup(service_name);
1172
1173        p->in = 0;
1174        p->out = 1;
1175        strbuf_init(&p->request_buffer, 0);
1176
1177        strbuf_addf(&buf, "%s%s", url.buf, p->service_name);
1178        p->service_url = strbuf_detach(&buf, NULL);
1179
1180        p->headers = http_copy_default_headers();
1181
1182        strbuf_addf(&buf, "Content-Type: application/x-%s-request", p->service_name);
1183        p->headers = curl_slist_append(p->headers, buf.buf);
1184        strbuf_reset(&buf);
1185
1186        strbuf_addf(&buf, "Accept: application/x-%s-result", p->service_name);
1187        p->headers = curl_slist_append(p->headers, buf.buf);
1188        strbuf_reset(&buf);
1189
1190        p->headers = curl_slist_append(p->headers, "Transfer-Encoding: chunked");
1191
1192        /* Add the Git-Protocol header */
1193        if (get_protocol_http_header(version, &buf))
1194                p->headers = curl_slist_append(p->headers, buf.buf);
1195
1196        packet_reader_init(&p->reader, p->in, NULL, 0,
1197                           PACKET_READ_GENTLE_ON_EOF);
1198
1199        strbuf_release(&buf);
1200}
1201
1202static void proxy_state_clear(struct proxy_state *p)
1203{
1204        free(p->service_name);
1205        free(p->service_url);
1206        curl_slist_free_all(p->headers);
1207        strbuf_release(&p->request_buffer);
1208}
1209
1210/*
1211 * CURLOPT_READFUNCTION callback function.
1212 * Attempts to copy over a single packet-line at a time into the
1213 * curl provided buffer.
1214 */
1215static size_t proxy_in(char *buffer, size_t eltsize,
1216                       size_t nmemb, void *userdata)
1217{
1218        size_t max;
1219        struct proxy_state *p = userdata;
1220        size_t avail = p->request_buffer.len - p->pos;
1221
1222
1223        if (eltsize != 1)
1224                BUG("curl read callback called with size = %"PRIuMAX" != 1",
1225                    (uintmax_t)eltsize);
1226        max = nmemb;
1227
1228        if (!avail) {
1229                if (p->seen_flush) {
1230                        p->seen_flush = 0;
1231                        return 0;
1232                }
1233
1234                strbuf_reset(&p->request_buffer);
1235                switch (packet_reader_read(&p->reader)) {
1236                case PACKET_READ_EOF:
1237                        die("unexpected EOF when reading from parent process");
1238                case PACKET_READ_NORMAL:
1239                        packet_buf_write_len(&p->request_buffer, p->reader.line,
1240                                             p->reader.pktlen);
1241                        break;
1242                case PACKET_READ_DELIM:
1243                        packet_buf_delim(&p->request_buffer);
1244                        break;
1245                case PACKET_READ_FLUSH:
1246                        packet_buf_flush(&p->request_buffer);
1247                        p->seen_flush = 1;
1248                        break;
1249                }
1250                p->pos = 0;
1251                avail = p->request_buffer.len;
1252        }
1253
1254        if (max < avail)
1255                avail = max;
1256        memcpy(buffer, p->request_buffer.buf + p->pos, avail);
1257        p->pos += avail;
1258        return avail;
1259}
1260
1261static size_t proxy_out(char *buffer, size_t eltsize,
1262                        size_t nmemb, void *userdata)
1263{
1264        size_t size;
1265        struct proxy_state *p = userdata;
1266
1267        if (eltsize != 1)
1268                BUG("curl read callback called with size = %"PRIuMAX" != 1",
1269                    (uintmax_t)eltsize);
1270        size = nmemb;
1271
1272        write_or_die(p->out, buffer, size);
1273        return size;
1274}
1275
1276/* Issues a request to the HTTP server configured in `p` */
1277static int proxy_request(struct proxy_state *p)
1278{
1279        struct active_request_slot *slot;
1280
1281        slot = get_active_slot();
1282
1283        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
1284        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1285        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
1286        curl_easy_setopt(slot->curl, CURLOPT_URL, p->service_url);
1287        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, p->headers);
1288
1289        /* Setup function to read request from client */
1290        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, proxy_in);
1291        curl_easy_setopt(slot->curl, CURLOPT_READDATA, p);
1292
1293        /* Setup function to write server response to client */
1294        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, proxy_out);
1295        curl_easy_setopt(slot->curl, CURLOPT_WRITEDATA, p);
1296
1297        if (run_slot(slot, NULL) != HTTP_OK)
1298                return -1;
1299
1300        return 0;
1301}
1302
1303static int stateless_connect(const char *service_name)
1304{
1305        struct discovery *discover;
1306        struct proxy_state p;
1307
1308        /*
1309         * Run the info/refs request and see if the server supports protocol
1310         * v2.  If and only if the server supports v2 can we successfully
1311         * establish a stateless connection, otherwise we need to tell the
1312         * client to fallback to using other transport helper functions to
1313         * complete their request.
1314         */
1315        discover = discover_refs(service_name, 0);
1316        if (discover->version != protocol_v2) {
1317                printf("fallback\n");
1318                fflush(stdout);
1319                return -1;
1320        } else {
1321                /* Stateless Connection established */
1322                printf("\n");
1323                fflush(stdout);
1324        }
1325
1326        proxy_state_init(&p, service_name, discover->version);
1327
1328        /*
1329         * Dump the capability listing that we got from the server earlier
1330         * during the info/refs request.
1331         */
1332        write_or_die(p.out, discover->buf, discover->len);
1333
1334        /* Peek the next packet line.  Until we see EOF keep sending POSTs */
1335        while (packet_reader_peek(&p.reader) != PACKET_READ_EOF) {
1336                if (proxy_request(&p)) {
1337                        /* We would have an err here */
1338                        break;
1339                }
1340        }
1341
1342        proxy_state_clear(&p);
1343        return 0;
1344}
1345
1346int cmd_main(int argc, const char **argv)
1347{
1348        struct strbuf buf = STRBUF_INIT;
1349        int nongit;
1350
1351        setup_git_directory_gently(&nongit);
1352        if (argc < 2) {
1353                error("remote-curl: usage: git remote-curl <remote> [<url>]");
1354                return 1;
1355        }
1356
1357        options.verbosity = 1;
1358        options.progress = !!isatty(2);
1359        options.thin = 1;
1360        string_list_init(&options.deepen_not, 1);
1361        string_list_init(&options.push_options, 1);
1362
1363        remote = remote_get(argv[1]);
1364
1365        if (argc > 2) {
1366                end_url_with_slash(&url, argv[2]);
1367        } else {
1368                end_url_with_slash(&url, remote->url[0]);
1369        }
1370
1371        http_init(remote, url.buf, 0);
1372
1373        do {
1374                const char *arg;
1375
1376                if (strbuf_getline_lf(&buf, stdin) == EOF) {
1377                        if (ferror(stdin))
1378                                error("remote-curl: error reading command stream from git");
1379                        return 1;
1380                }
1381                if (buf.len == 0)
1382                        break;
1383                if (starts_with(buf.buf, "fetch ")) {
1384                        if (nongit)
1385                                die("remote-curl: fetch attempted without a local repo");
1386                        parse_fetch(&buf);
1387
1388                } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1389                        int for_push = !!strstr(buf.buf + 4, "for-push");
1390                        output_refs(get_refs(for_push));
1391
1392                } else if (starts_with(buf.buf, "push ")) {
1393                        parse_push(&buf);
1394
1395                } else if (skip_prefix(buf.buf, "option ", &arg)) {
1396                        char *value = strchr(arg, ' ');
1397                        int result;
1398
1399                        if (value)
1400                                *value++ = '\0';
1401                        else
1402                                value = "true";
1403
1404                        result = set_option(arg, value);
1405                        if (!result)
1406                                printf("ok\n");
1407                        else if (result < 0)
1408                                printf("error invalid value\n");
1409                        else
1410                                printf("unsupported\n");
1411                        fflush(stdout);
1412
1413                } else if (!strcmp(buf.buf, "capabilities")) {
1414                        printf("stateless-connect\n");
1415                        printf("fetch\n");
1416                        printf("option\n");
1417                        printf("push\n");
1418                        printf("check-connectivity\n");
1419                        printf("\n");
1420                        fflush(stdout);
1421                } else if (skip_prefix(buf.buf, "stateless-connect ", &arg)) {
1422                        if (!stateless_connect(arg))
1423                                break;
1424                } else {
1425                        error("remote-curl: unknown command '%s' from git", buf.buf);
1426                        return 1;
1427                }
1428                strbuf_reset(&buf);
1429        } while (1);
1430
1431        http_cleanup();
1432
1433        return 0;
1434}