Andrew's git / gitweb.git / remote-curl.c
?
remote-curl.con commit t4042: abstract away SHA-1-specific constants (e4c5652)
   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        http_options.keep_error = 1;
 384
 385        http_ret = http_get_strbuf(refs_url.buf, &buffer, &http_options);
 386        switch (http_ret) {
 387        case HTTP_OK:
 388                break;
 389        case HTTP_MISSING_TARGET:
 390                show_http_message(&type, &charset, &buffer);
 391                die("repository '%s' not found", url.buf);
 392        case HTTP_NOAUTH:
 393                show_http_message(&type, &charset, &buffer);
 394                die("Authentication failed for '%s'", url.buf);
 395        default:
 396                show_http_message(&type, &charset, &buffer);
 397                die("unable to access '%s': %s", url.buf, curl_errorstr);
 398        }
 399
 400        if (options.verbosity && !starts_with(refs_url.buf, url.buf))
 401                warning(_("redirecting to %s"), url.buf);
 402
 403        last= xcalloc(1, sizeof(*last_discovery));
 404        last->service = xstrdup(service);
 405        last->buf_alloc = strbuf_detach(&buffer, &last->len);
 406        last->buf = last->buf_alloc;
 407
 408        strbuf_addf(&exp, "application/x-%s-advertisement", service);
 409        if (maybe_smart &&
 410            (5 <= last->len && last->buf[4] == '#') &&
 411            !strbuf_cmp(&exp, &type)) {
 412                char *line;
 413
 414                /*
 415                 * smart HTTP response; validate that the service
 416                 * pkt-line matches our request.
 417                 */
 418                line = packet_read_line_buf(&last->buf, &last->len, NULL);
 419                if (!line)
 420                        die("invalid server response; expected service, got flush packet");
 421
 422                strbuf_reset(&exp);
 423                strbuf_addf(&exp, "# service=%s", service);
 424                if (strcmp(line, exp.buf))
 425                        die("invalid server response; got '%s'", line);
 426                strbuf_release(&exp);
 427
 428                /* The header can include additional metadata lines, up
 429                 * until a packet flush marker.  Ignore these now, but
 430                 * in the future we might start to scan them.
 431                 */
 432                while (packet_read_line_buf(&last->buf, &last->len, NULL))
 433                        ;
 434
 435                last->proto_git = 1;
 436        } else if (maybe_smart &&
 437                   last->len > 5 && starts_with(last->buf + 4, "version 2")) {
 438                last->proto_git = 1;
 439        }
 440
 441        if (last->proto_git)
 442                last->refs = parse_git_refs(last, for_push);
 443        else
 444                last->refs = parse_info_refs(last);
 445
 446        strbuf_release(&refs_url);
 447        strbuf_release(&exp);
 448        strbuf_release(&type);
 449        strbuf_release(&charset);
 450        strbuf_release(&effective_url);
 451        strbuf_release(&buffer);
 452        strbuf_release(&protocol_header);
 453        string_list_clear(&extra_headers, 0);
 454        last_discovery = last;
 455        return last;
 456}
 457
 458static struct ref *get_refs(int for_push)
 459{
 460        struct discovery *heads;
 461
 462        if (for_push)
 463                heads = discover_refs("git-receive-pack", for_push);
 464        else
 465                heads = discover_refs("git-upload-pack", for_push);
 466
 467        return heads->refs;
 468}
 469
 470static void output_refs(struct ref *refs)
 471{
 472        struct ref *posn;
 473        for (posn = refs; posn; posn = posn->next) {
 474                if (posn->symref)
 475                        printf("@%s %s\n", posn->symref, posn->name);
 476                else
 477                        printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name);
 478        }
 479        printf("\n");
 480        fflush(stdout);
 481}
 482
 483struct rpc_state {
 484        const char *service_name;
 485        const char **argv;
 486        struct strbuf *stdin_preamble;
 487        char *service_url;
 488        char *hdr_content_type;
 489        char *hdr_accept;
 490        char *protocol_header;
 491        char *buf;
 492        size_t alloc;
 493        size_t len;
 494        size_t pos;
 495        int in;
 496        int out;
 497        int any_written;
 498        struct strbuf result;
 499        unsigned gzip_request : 1;
 500        unsigned initial_buffer : 1;
 501};
 502
 503static size_t rpc_out(void *ptr, size_t eltsize,
 504                size_t nmemb, void *buffer_)
 505{
 506        size_t max = eltsize * nmemb;
 507        struct rpc_state *rpc = buffer_;
 508        size_t avail = rpc->len - rpc->pos;
 509
 510        if (!avail) {
 511                rpc->initial_buffer = 0;
 512                avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 513                if (!avail)
 514                        return 0;
 515                rpc->pos = 0;
 516                rpc->len = avail;
 517        }
 518
 519        if (max < avail)
 520                avail = max;
 521        memcpy(ptr, rpc->buf + rpc->pos, avail);
 522        rpc->pos += avail;
 523        return avail;
 524}
 525
 526#ifndef NO_CURL_IOCTL
 527static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 528{
 529        struct rpc_state *rpc = clientp;
 530
 531        switch (cmd) {
 532        case CURLIOCMD_NOP:
 533                return CURLIOE_OK;
 534
 535        case CURLIOCMD_RESTARTREAD:
 536                if (rpc->initial_buffer) {
 537                        rpc->pos = 0;
 538                        return CURLIOE_OK;
 539                }
 540                error("unable to rewind rpc post data - try increasing http.postBuffer");
 541                return CURLIOE_FAILRESTART;
 542
 543        default:
 544                return CURLIOE_UNKNOWNCMD;
 545        }
 546}
 547#endif
 548
 549static size_t rpc_in(char *ptr, size_t eltsize,
 550                size_t nmemb, void *buffer_)
 551{
 552        size_t size = eltsize * nmemb;
 553        struct rpc_state *rpc = buffer_;
 554        if (size)
 555                rpc->any_written = 1;
 556        write_or_die(rpc->in, ptr, size);
 557        return size;
 558}
 559
 560static int run_slot(struct active_request_slot *slot,
 561                    struct slot_results *results)
 562{
 563        int err;
 564        struct slot_results results_buf;
 565
 566        if (!results)
 567                results = &results_buf;
 568
 569        err = run_one_slot(slot, results);
 570
 571        if (err != HTTP_OK && err != HTTP_REAUTH) {
 572                struct strbuf msg = STRBUF_INIT;
 573                if (results->http_code && results->http_code != 200)
 574                        strbuf_addf(&msg, "HTTP %ld", results->http_code);
 575                if (results->curl_result != CURLE_OK) {
 576                        if (msg.len)
 577                                strbuf_addch(&msg, ' ');
 578                        strbuf_addf(&msg, "curl %d", results->curl_result);
 579                        if (curl_errorstr[0]) {
 580                                strbuf_addch(&msg, ' ');
 581                                strbuf_addstr(&msg, curl_errorstr);
 582                        }
 583                }
 584                error("RPC failed; %s", msg.buf);
 585                strbuf_release(&msg);
 586        }
 587
 588        return err;
 589}
 590
 591static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 592{
 593        struct active_request_slot *slot;
 594        struct curl_slist *headers = http_copy_default_headers();
 595        struct strbuf buf = STRBUF_INIT;
 596        int err;
 597
 598        slot = get_active_slot();
 599
 600        headers = curl_slist_append(headers, rpc->hdr_content_type);
 601        headers = curl_slist_append(headers, rpc->hdr_accept);
 602
 603        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 604        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 605        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 606        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 607        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 608        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 609        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 610        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 611        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 612
 613        err = run_slot(slot, results);
 614
 615        curl_slist_free_all(headers);
 616        strbuf_release(&buf);
 617        return err;
 618}
 619
 620static curl_off_t xcurl_off_t(ssize_t len) {
 621        if (len > maximum_signed_value_of_type(curl_off_t))
 622                die("cannot handle pushes this big");
 623        return (curl_off_t) len;
 624}
 625
 626static int post_rpc(struct rpc_state *rpc)
 627{
 628        struct active_request_slot *slot;
 629        struct curl_slist *headers = http_copy_default_headers();
 630        int use_gzip = rpc->gzip_request;
 631        char *gzip_body = NULL;
 632        size_t gzip_size = 0;
 633        int err, large_request = 0;
 634        int needs_100_continue = 0;
 635
 636        /* Try to load the entire request, if we can fit it into the
 637         * allocated buffer space we can use HTTP/1.0 and avoid the
 638         * chunked encoding mess.
 639         */
 640        while (1) {
 641                size_t left = rpc->alloc - rpc->len;
 642                char *buf = rpc->buf + rpc->len;
 643                int n;
 644
 645                if (left < LARGE_PACKET_MAX) {
 646                        large_request = 1;
 647                        use_gzip = 0;
 648                        break;
 649                }
 650
 651                n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 652                if (!n)
 653                        break;
 654                rpc->len += n;
 655        }
 656
 657        if (large_request) {
 658                struct slot_results results;
 659
 660                do {
 661                        err = probe_rpc(rpc, &results);
 662                        if (err == HTTP_REAUTH)
 663                                credential_fill(&http_auth);
 664                } while (err == HTTP_REAUTH);
 665                if (err != HTTP_OK)
 666                        return -1;
 667
 668                if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 669                        needs_100_continue = 1;
 670        }
 671
 672        headers = curl_slist_append(headers, rpc->hdr_content_type);
 673        headers = curl_slist_append(headers, rpc->hdr_accept);
 674        headers = curl_slist_append(headers, needs_100_continue ?
 675                "Expect: 100-continue" : "Expect:");
 676
 677        /* Add the extra Git-Protocol header */
 678        if (rpc->protocol_header)
 679                headers = curl_slist_append(headers, rpc->protocol_header);
 680
 681retry:
 682        slot = get_active_slot();
 683
 684        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 685        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 686        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 687        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 688
 689        if (large_request) {
 690                /* The request body is large and the size cannot be predicted.
 691                 * We must use chunked encoding to send it.
 692                 */
 693                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 694                rpc->initial_buffer = 1;
 695                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 696                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 697#ifndef NO_CURL_IOCTL
 698                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 699                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 700#endif
 701                if (options.verbosity > 1) {
 702                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 703                        fflush(stderr);
 704                }
 705
 706        } else if (gzip_body) {
 707                /*
 708                 * If we are looping to retry authentication, then the previous
 709                 * run will have set up the headers and gzip buffer already,
 710                 * and we just need to send it.
 711                 */
 712                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 713                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 714
 715        } else if (use_gzip && 1024 < rpc->len) {
 716                /* The client backend isn't giving us compressed data so
 717                 * we can try to deflate it ourselves, this may save on.
 718                 * the transfer time.
 719                 */
 720                git_zstream stream;
 721                int ret;
 722
 723                git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 724                gzip_size = git_deflate_bound(&stream, rpc->len);
 725                gzip_body = xmalloc(gzip_size);
 726
 727                stream.next_in = (unsigned char *)rpc->buf;
 728                stream.avail_in = rpc->len;
 729                stream.next_out = (unsigned char *)gzip_body;
 730                stream.avail_out = gzip_size;
 731
 732                ret = git_deflate(&stream, Z_FINISH);
 733                if (ret != Z_STREAM_END)
 734                        die("cannot deflate request; zlib deflate error %d", ret);
 735
 736                ret = git_deflate_end_gently(&stream);
 737                if (ret != Z_OK)
 738                        die("cannot deflate request; zlib end error %d", ret);
 739
 740                gzip_size = stream.total_out;
 741
 742                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 743                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 744                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 745
 746                if (options.verbosity > 1) {
 747                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 748                                rpc->service_name,
 749                                (unsigned long)rpc->len, (unsigned long)gzip_size);
 750                        fflush(stderr);
 751                }
 752        } else {
 753                /* We know the complete request size in advance, use the
 754                 * more normal Content-Length approach.
 755                 */
 756                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 757                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(rpc->len));
 758                if (options.verbosity > 1) {
 759                        fprintf(stderr, "POST %s (%lu bytes)\n",
 760                                rpc->service_name, (unsigned long)rpc->len);
 761                        fflush(stderr);
 762                }
 763        }
 764
 765        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 766        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 767        curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 768
 769
 770        rpc->any_written = 0;
 771        err = run_slot(slot, NULL);
 772        if (err == HTTP_REAUTH && !large_request) {
 773                credential_fill(&http_auth);
 774                goto retry;
 775        }
 776        if (err != HTTP_OK)
 777                err = -1;
 778
 779        if (!rpc->any_written)
 780                err = -1;
 781
 782        curl_slist_free_all(headers);
 783        free(gzip_body);
 784        return err;
 785}
 786
 787static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 788{
 789        const char *svc = rpc->service_name;
 790        struct strbuf buf = STRBUF_INIT;
 791        struct strbuf *preamble = rpc->stdin_preamble;
 792        struct child_process client = CHILD_PROCESS_INIT;
 793        int err = 0;
 794
 795        client.in = -1;
 796        client.out = -1;
 797        client.git_cmd = 1;
 798        client.argv = rpc->argv;
 799        if (start_command(&client))
 800                exit(1);
 801        if (preamble)
 802                write_or_die(client.in, preamble->buf, preamble->len);
 803        if (heads)
 804                write_or_die(client.in, heads->buf, heads->len);
 805
 806        rpc->alloc = http_post_buffer;
 807        rpc->buf = xmalloc(rpc->alloc);
 808        rpc->in = client.in;
 809        rpc->out = client.out;
 810        strbuf_init(&rpc->result, 0);
 811
 812        strbuf_addf(&buf, "%s%s", url.buf, svc);
 813        rpc->service_url = strbuf_detach(&buf, NULL);
 814
 815        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 816        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 817
 818        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 819        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 820
 821        if (get_protocol_http_header(heads->version, &buf))
 822                rpc->protocol_header = strbuf_detach(&buf, NULL);
 823        else
 824                rpc->protocol_header = NULL;
 825
 826        while (!err) {
 827                int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 828                if (!n)
 829                        break;
 830                rpc->pos = 0;
 831                rpc->len = n;
 832                err |= post_rpc(rpc);
 833        }
 834
 835        close(client.in);
 836        client.in = -1;
 837        if (!err) {
 838                strbuf_read(&rpc->result, client.out, 0);
 839        } else {
 840                char buf[4096];
 841                for (;;)
 842                        if (xread(client.out, buf, sizeof(buf)) <= 0)
 843                                break;
 844        }
 845
 846        close(client.out);
 847        client.out = -1;
 848
 849        err |= finish_command(&client);
 850        free(rpc->service_url);
 851        free(rpc->hdr_content_type);
 852        free(rpc->hdr_accept);
 853        free(rpc->protocol_header);
 854        free(rpc->buf);
 855        strbuf_release(&buf);
 856        return err;
 857}
 858
 859static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 860{
 861        struct walker *walker;
 862        char **targets;
 863        int ret, i;
 864
 865        ALLOC_ARRAY(targets, nr_heads);
 866        if (options.depth || options.deepen_since)
 867                die("dumb http transport does not support shallow capabilities");
 868        for (i = 0; i < nr_heads; i++)
 869                targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
 870
 871        walker = get_http_walker(url.buf);
 872        walker->get_verbosely = options.verbosity >= 3;
 873        walker->get_recover = 0;
 874        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 875        walker_free(walker);
 876
 877        for (i = 0; i < nr_heads; i++)
 878                free(targets[i]);
 879        free(targets);
 880
 881        return ret ? error("fetch failed.") : 0;
 882}
 883
 884static int fetch_git(struct discovery *heads,
 885        int nr_heads, struct ref **to_fetch)
 886{
 887        struct rpc_state rpc;
 888        struct strbuf preamble = STRBUF_INIT;
 889        int i, err;
 890        struct argv_array args = ARGV_ARRAY_INIT;
 891
 892        argv_array_pushl(&args, "fetch-pack", "--stateless-rpc",
 893                         "--stdin", "--lock-pack", NULL);
 894        if (options.followtags)
 895                argv_array_push(&args, "--include-tag");
 896        if (options.thin)
 897                argv_array_push(&args, "--thin");
 898        if (options.verbosity >= 3)
 899                argv_array_pushl(&args, "-v", "-v", NULL);
 900        if (options.check_self_contained_and_connected)
 901                argv_array_push(&args, "--check-self-contained-and-connected");
 902        if (options.cloning)
 903                argv_array_push(&args, "--cloning");
 904        if (options.update_shallow)
 905                argv_array_push(&args, "--update-shallow");
 906        if (!options.progress)
 907                argv_array_push(&args, "--no-progress");
 908        if (options.depth)
 909                argv_array_pushf(&args, "--depth=%lu", options.depth);
 910        if (options.deepen_since)
 911                argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since);
 912        for (i = 0; i < options.deepen_not.nr; i++)
 913                argv_array_pushf(&args, "--shallow-exclude=%s",
 914                                 options.deepen_not.items[i].string);
 915        if (options.deepen_relative && options.depth)
 916                argv_array_push(&args, "--deepen-relative");
 917        if (options.from_promisor)
 918                argv_array_push(&args, "--from-promisor");
 919        if (options.no_dependents)
 920                argv_array_push(&args, "--no-dependents");
 921        if (options.filter)
 922                argv_array_pushf(&args, "--filter=%s", options.filter);
 923        argv_array_push(&args, url.buf);
 924
 925        for (i = 0; i < nr_heads; i++) {
 926                struct ref *ref = to_fetch[i];
 927                if (!*ref->name)
 928                        die("cannot fetch by sha1 over smart http");
 929                packet_buf_write(&preamble, "%s %s\n",
 930                                 oid_to_hex(&ref->old_oid), ref->name);
 931        }
 932        packet_buf_flush(&preamble);
 933
 934        memset(&rpc, 0, sizeof(rpc));
 935        rpc.service_name = "git-upload-pack",
 936        rpc.argv = args.argv;
 937        rpc.stdin_preamble = &preamble;
 938        rpc.gzip_request = 1;
 939
 940        err = rpc_service(&rpc, heads);
 941        if (rpc.result.len)
 942                write_or_die(1, rpc.result.buf, rpc.result.len);
 943        strbuf_release(&rpc.result);
 944        strbuf_release(&preamble);
 945        argv_array_clear(&args);
 946        return err;
 947}
 948
 949static int fetch(int nr_heads, struct ref **to_fetch)
 950{
 951        struct discovery *d = discover_refs("git-upload-pack", 0);
 952        if (d->proto_git)
 953                return fetch_git(d, nr_heads, to_fetch);
 954        else
 955                return fetch_dumb(nr_heads, to_fetch);
 956}
 957
 958static void parse_fetch(struct strbuf *buf)
 959{
 960        struct ref **to_fetch = NULL;
 961        struct ref *list_head = NULL;
 962        struct ref **list = &list_head;
 963        int alloc_heads = 0, nr_heads = 0;
 964
 965        do {
 966                const char *p;
 967                if (skip_prefix(buf->buf, "fetch ", &p)) {
 968                        const char *name;
 969                        struct ref *ref;
 970                        struct object_id old_oid;
 971
 972                        if (get_oid_hex(p, &old_oid))
 973                                die("protocol error: expected sha/ref, got %s'", p);
 974                        if (p[GIT_SHA1_HEXSZ] == ' ')
 975                                name = p + GIT_SHA1_HEXSZ + 1;
 976                        else if (!p[GIT_SHA1_HEXSZ])
 977                                name = "";
 978                        else
 979                                die("protocol error: expected sha/ref, got %s'", p);
 980
 981                        ref = alloc_ref(name);
 982                        oidcpy(&ref->old_oid, &old_oid);
 983
 984                        *list = ref;
 985                        list = &ref->next;
 986
 987                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 988                        to_fetch[nr_heads++] = ref;
 989                }
 990                else
 991                        die("http transport does not support %s", buf->buf);
 992
 993                strbuf_reset(buf);
 994                if (strbuf_getline_lf(buf, stdin) == EOF)
 995                        return;
 996                if (!*buf->buf)
 997                        break;
 998        } while (1);
 999
1000        if (fetch(nr_heads, to_fetch))
1001                exit(128); /* error already reported */
1002        free_refs(list_head);
1003        free(to_fetch);
1004
1005        printf("\n");
1006        fflush(stdout);
1007        strbuf_reset(buf);
1008}
1009
1010static int push_dav(int nr_spec, char **specs)
1011{
1012        struct child_process child = CHILD_PROCESS_INIT;
1013        size_t i;
1014
1015        child.git_cmd = 1;
1016        argv_array_push(&child.args, "http-push");
1017        argv_array_push(&child.args, "--helper-status");
1018        if (options.dry_run)
1019                argv_array_push(&child.args, "--dry-run");
1020        if (options.verbosity > 1)
1021                argv_array_push(&child.args, "--verbose");
1022        argv_array_push(&child.args, url.buf);
1023        for (i = 0; i < nr_spec; i++)
1024                argv_array_push(&child.args, specs[i]);
1025
1026        if (run_command(&child))
1027                die("git-http-push failed");
1028        return 0;
1029}
1030
1031static int push_git(struct discovery *heads, int nr_spec, char **specs)
1032{
1033        struct rpc_state rpc;
1034        int i, err;
1035        struct argv_array args;
1036        struct string_list_item *cas_option;
1037        struct strbuf preamble = STRBUF_INIT;
1038
1039        argv_array_init(&args);
1040        argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
1041                         NULL);
1042
1043        if (options.thin)
1044                argv_array_push(&args, "--thin");
1045        if (options.dry_run)
1046                argv_array_push(&args, "--dry-run");
1047        if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
1048                argv_array_push(&args, "--signed=yes");
1049        else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
1050                argv_array_push(&args, "--signed=if-asked");
1051        if (options.verbosity == 0)
1052                argv_array_push(&args, "--quiet");
1053        else if (options.verbosity > 1)
1054                argv_array_push(&args, "--verbose");
1055        for (i = 0; i < options.push_options.nr; i++)
1056                argv_array_pushf(&args, "--push-option=%s",
1057                                 options.push_options.items[i].string);
1058        argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
1059        for_each_string_list_item(cas_option, &cas_options)
1060                argv_array_push(&args, cas_option->string);
1061        argv_array_push(&args, url.buf);
1062
1063        argv_array_push(&args, "--stdin");
1064        for (i = 0; i < nr_spec; i++)
1065                packet_buf_write(&preamble, "%s\n", specs[i]);
1066        packet_buf_flush(&preamble);
1067
1068        memset(&rpc, 0, sizeof(rpc));
1069        rpc.service_name = "git-receive-pack",
1070        rpc.argv = args.argv;
1071        rpc.stdin_preamble = &preamble;
1072
1073        err = rpc_service(&rpc, heads);
1074        if (rpc.result.len)
1075                write_or_die(1, rpc.result.buf, rpc.result.len);
1076        strbuf_release(&rpc.result);
1077        strbuf_release(&preamble);
1078        argv_array_clear(&args);
1079        return err;
1080}
1081
1082static int push(int nr_spec, char **specs)
1083{
1084        struct discovery *heads = discover_refs("git-receive-pack", 1);
1085        int ret;
1086
1087        if (heads->proto_git)
1088                ret = push_git(heads, nr_spec, specs);
1089        else
1090                ret = push_dav(nr_spec, specs);
1091        free_discovery(heads);
1092        return ret;
1093}
1094
1095static void parse_push(struct strbuf *buf)
1096{
1097        char **specs = NULL;
1098        int alloc_spec = 0, nr_spec = 0, i, ret;
1099
1100        do {
1101                if (starts_with(buf->buf, "push ")) {
1102                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
1103                        specs[nr_spec++] = xstrdup(buf->buf + 5);
1104                }
1105                else
1106                        die("http transport does not support %s", buf->buf);
1107
1108                strbuf_reset(buf);
1109                if (strbuf_getline_lf(buf, stdin) == EOF)
1110                        goto free_specs;
1111                if (!*buf->buf)
1112                        break;
1113        } while (1);
1114
1115        ret = push(nr_spec, specs);
1116        printf("\n");
1117        fflush(stdout);
1118
1119        if (ret)
1120                exit(128); /* error already reported */
1121
1122 free_specs:
1123        for (i = 0; i < nr_spec; i++)
1124                free(specs[i]);
1125        free(specs);
1126}
1127
1128/*
1129 * Used to represent the state of a connection to an HTTP server when
1130 * communicating using git's wire-protocol version 2.
1131 */
1132struct proxy_state {
1133        char *service_name;
1134        char *service_url;
1135        struct curl_slist *headers;
1136        struct strbuf request_buffer;
1137        int in;
1138        int out;
1139        struct packet_reader reader;
1140        size_t pos;
1141        int seen_flush;
1142};
1143
1144static void proxy_state_init(struct proxy_state *p, const char *service_name,
1145                             enum protocol_version version)
1146{
1147        struct strbuf buf = STRBUF_INIT;
1148
1149        memset(p, 0, sizeof(*p));
1150        p->service_name = xstrdup(service_name);
1151
1152        p->in = 0;
1153        p->out = 1;
1154        strbuf_init(&p->request_buffer, 0);
1155
1156        strbuf_addf(&buf, "%s%s", url.buf, p->service_name);
1157        p->service_url = strbuf_detach(&buf, NULL);
1158
1159        p->headers = http_copy_default_headers();
1160
1161        strbuf_addf(&buf, "Content-Type: application/x-%s-request", p->service_name);
1162        p->headers = curl_slist_append(p->headers, buf.buf);
1163        strbuf_reset(&buf);
1164
1165        strbuf_addf(&buf, "Accept: application/x-%s-result", p->service_name);
1166        p->headers = curl_slist_append(p->headers, buf.buf);
1167        strbuf_reset(&buf);
1168
1169        p->headers = curl_slist_append(p->headers, "Transfer-Encoding: chunked");
1170
1171        /* Add the Git-Protocol header */
1172        if (get_protocol_http_header(version, &buf))
1173                p->headers = curl_slist_append(p->headers, buf.buf);
1174
1175        packet_reader_init(&p->reader, p->in, NULL, 0,
1176                           PACKET_READ_GENTLE_ON_EOF);
1177
1178        strbuf_release(&buf);
1179}
1180
1181static void proxy_state_clear(struct proxy_state *p)
1182{
1183        free(p->service_name);
1184        free(p->service_url);
1185        curl_slist_free_all(p->headers);
1186        strbuf_release(&p->request_buffer);
1187}
1188
1189/*
1190 * CURLOPT_READFUNCTION callback function.
1191 * Attempts to copy over a single packet-line at a time into the
1192 * curl provided buffer.
1193 */
1194static size_t proxy_in(char *buffer, size_t eltsize,
1195                       size_t nmemb, void *userdata)
1196{
1197        size_t max;
1198        struct proxy_state *p = userdata;
1199        size_t avail = p->request_buffer.len - p->pos;
1200
1201
1202        if (eltsize != 1)
1203                BUG("curl read callback called with size = %"PRIuMAX" != 1",
1204                    (uintmax_t)eltsize);
1205        max = nmemb;
1206
1207        if (!avail) {
1208                if (p->seen_flush) {
1209                        p->seen_flush = 0;
1210                        return 0;
1211                }
1212
1213                strbuf_reset(&p->request_buffer);
1214                switch (packet_reader_read(&p->reader)) {
1215                case PACKET_READ_EOF:
1216                        die("unexpected EOF when reading from parent process");
1217                case PACKET_READ_NORMAL:
1218                        packet_buf_write_len(&p->request_buffer, p->reader.line,
1219                                             p->reader.pktlen);
1220                        break;
1221                case PACKET_READ_DELIM:
1222                        packet_buf_delim(&p->request_buffer);
1223                        break;
1224                case PACKET_READ_FLUSH:
1225                        packet_buf_flush(&p->request_buffer);
1226                        p->seen_flush = 1;
1227                        break;
1228                }
1229                p->pos = 0;
1230                avail = p->request_buffer.len;
1231        }
1232
1233        if (max < avail)
1234                avail = max;
1235        memcpy(buffer, p->request_buffer.buf + p->pos, avail);
1236        p->pos += avail;
1237        return avail;
1238}
1239
1240static size_t proxy_out(char *buffer, size_t eltsize,
1241                        size_t nmemb, void *userdata)
1242{
1243        size_t size;
1244        struct proxy_state *p = userdata;
1245
1246        if (eltsize != 1)
1247                BUG("curl read callback called with size = %"PRIuMAX" != 1",
1248                    (uintmax_t)eltsize);
1249        size = nmemb;
1250
1251        write_or_die(p->out, buffer, size);
1252        return size;
1253}
1254
1255/* Issues a request to the HTTP server configured in `p` */
1256static int proxy_request(struct proxy_state *p)
1257{
1258        struct active_request_slot *slot;
1259
1260        slot = get_active_slot();
1261
1262        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1263        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
1264        curl_easy_setopt(slot->curl, CURLOPT_URL, p->service_url);
1265        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, p->headers);
1266
1267        /* Setup function to read request from client */
1268        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, proxy_in);
1269        curl_easy_setopt(slot->curl, CURLOPT_READDATA, p);
1270
1271        /* Setup function to write server response to client */
1272        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, proxy_out);
1273        curl_easy_setopt(slot->curl, CURLOPT_WRITEDATA, p);
1274
1275        if (run_slot(slot, NULL) != HTTP_OK)
1276                return -1;
1277
1278        return 0;
1279}
1280
1281static int stateless_connect(const char *service_name)
1282{
1283        struct discovery *discover;
1284        struct proxy_state p;
1285
1286        /*
1287         * Run the info/refs request and see if the server supports protocol
1288         * v2.  If and only if the server supports v2 can we successfully
1289         * establish a stateless connection, otherwise we need to tell the
1290         * client to fallback to using other transport helper functions to
1291         * complete their request.
1292         */
1293        discover = discover_refs(service_name, 0);
1294        if (discover->version != protocol_v2) {
1295                printf("fallback\n");
1296                fflush(stdout);
1297                return -1;
1298        } else {
1299                /* Stateless Connection established */
1300                printf("\n");
1301                fflush(stdout);
1302        }
1303
1304        proxy_state_init(&p, service_name, discover->version);
1305
1306        /*
1307         * Dump the capability listing that we got from the server earlier
1308         * during the info/refs request.
1309         */
1310        write_or_die(p.out, discover->buf, discover->len);
1311
1312        /* Peek the next packet line.  Until we see EOF keep sending POSTs */
1313        while (packet_reader_peek(&p.reader) != PACKET_READ_EOF) {
1314                if (proxy_request(&p)) {
1315                        /* We would have an err here */
1316                        break;
1317                }
1318        }
1319
1320        proxy_state_clear(&p);
1321        return 0;
1322}
1323
1324int cmd_main(int argc, const char **argv)
1325{
1326        struct strbuf buf = STRBUF_INIT;
1327        int nongit;
1328
1329        setup_git_directory_gently(&nongit);
1330        if (argc < 2) {
1331                error("remote-curl: usage: git remote-curl <remote> [<url>]");
1332                return 1;
1333        }
1334
1335        options.verbosity = 1;
1336        options.progress = !!isatty(2);
1337        options.thin = 1;
1338        string_list_init(&options.deepen_not, 1);
1339        string_list_init(&options.push_options, 1);
1340
1341        remote = remote_get(argv[1]);
1342
1343        if (argc > 2) {
1344                end_url_with_slash(&url, argv[2]);
1345        } else {
1346                end_url_with_slash(&url, remote->url[0]);
1347        }
1348
1349        http_init(remote, url.buf, 0);
1350
1351        do {
1352                const char *arg;
1353
1354                if (strbuf_getline_lf(&buf, stdin) == EOF) {
1355                        if (ferror(stdin))
1356                                error("remote-curl: error reading command stream from git");
1357                        return 1;
1358                }
1359                if (buf.len == 0)
1360                        break;
1361                if (starts_with(buf.buf, "fetch ")) {
1362                        if (nongit)
1363                                die("remote-curl: fetch attempted without a local repo");
1364                        parse_fetch(&buf);
1365
1366                } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1367                        int for_push = !!strstr(buf.buf + 4, "for-push");
1368                        output_refs(get_refs(for_push));
1369
1370                } else if (starts_with(buf.buf, "push ")) {
1371                        parse_push(&buf);
1372
1373                } else if (skip_prefix(buf.buf, "option ", &arg)) {
1374                        char *value = strchr(arg, ' ');
1375                        int result;
1376
1377                        if (value)
1378                                *value++ = '\0';
1379                        else
1380                                value = "true";
1381
1382                        result = set_option(arg, value);
1383                        if (!result)
1384                                printf("ok\n");
1385                        else if (result < 0)
1386                                printf("error invalid value\n");
1387                        else
1388                                printf("unsupported\n");
1389                        fflush(stdout);
1390
1391                } else if (!strcmp(buf.buf, "capabilities")) {
1392                        printf("stateless-connect\n");
1393                        printf("fetch\n");
1394                        printf("option\n");
1395                        printf("push\n");
1396                        printf("check-connectivity\n");
1397                        printf("\n");
1398                        fflush(stdout);
1399                } else if (skip_prefix(buf.buf, "stateless-connect ", &arg)) {
1400                        if (!stateless_connect(arg))
1401                                break;
1402                } else {
1403                        error("remote-curl: unknown command '%s' from git", buf.buf);
1404                        return 1;
1405                }
1406                strbuf_reset(&buf);
1407        } while (1);
1408
1409        http_cleanup();
1410
1411        return 0;
1412}