Andrew's git / gitweb.git / remote-curl.c
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remote-curl.con commit remote-curl: define struct for CURLOPT_WRITEFUNCTION (cf2fb92)
   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};
 551
 552/*
 553 * A callback for CURLOPT_WRITEFUNCTION. The return value is the bytes consumed
 554 * from ptr.
 555 */
 556static size_t rpc_in(char *ptr, size_t eltsize,
 557                size_t nmemb, void *buffer_)
 558{
 559        size_t size = eltsize * nmemb;
 560        struct rpc_in_data *data = buffer_;
 561        if (size)
 562                data->rpc->any_written = 1;
 563        write_or_die(data->rpc->in, ptr, size);
 564        return size;
 565}
 566
 567static int run_slot(struct active_request_slot *slot,
 568                    struct slot_results *results)
 569{
 570        int err;
 571        struct slot_results results_buf;
 572
 573        if (!results)
 574                results = &results_buf;
 575
 576        err = run_one_slot(slot, results);
 577
 578        if (err != HTTP_OK && err != HTTP_REAUTH) {
 579                struct strbuf msg = STRBUF_INIT;
 580                if (results->http_code && results->http_code != 200)
 581                        strbuf_addf(&msg, "HTTP %ld", results->http_code);
 582                if (results->curl_result != CURLE_OK) {
 583                        if (msg.len)
 584                                strbuf_addch(&msg, ' ');
 585                        strbuf_addf(&msg, "curl %d", results->curl_result);
 586                        if (curl_errorstr[0]) {
 587                                strbuf_addch(&msg, ' ');
 588                                strbuf_addstr(&msg, curl_errorstr);
 589                        }
 590                }
 591                error("RPC failed; %s", msg.buf);
 592                strbuf_release(&msg);
 593        }
 594
 595        return err;
 596}
 597
 598static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 599{
 600        struct active_request_slot *slot;
 601        struct curl_slist *headers = http_copy_default_headers();
 602        struct strbuf buf = STRBUF_INIT;
 603        int err;
 604
 605        slot = get_active_slot();
 606
 607        headers = curl_slist_append(headers, rpc->hdr_content_type);
 608        headers = curl_slist_append(headers, rpc->hdr_accept);
 609
 610        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 611        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 612        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 613        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 614        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 615        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 616        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 617        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 618        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 619
 620        err = run_slot(slot, results);
 621
 622        curl_slist_free_all(headers);
 623        strbuf_release(&buf);
 624        return err;
 625}
 626
 627static curl_off_t xcurl_off_t(size_t len) {
 628        uintmax_t size = len;
 629        if (size > maximum_signed_value_of_type(curl_off_t))
 630                die("cannot handle pushes this big");
 631        return (curl_off_t)size;
 632}
 633
 634static int post_rpc(struct rpc_state *rpc)
 635{
 636        struct active_request_slot *slot;
 637        struct curl_slist *headers = http_copy_default_headers();
 638        int use_gzip = rpc->gzip_request;
 639        char *gzip_body = NULL;
 640        size_t gzip_size = 0;
 641        int err, large_request = 0;
 642        int needs_100_continue = 0;
 643        struct rpc_in_data rpc_in_data;
 644
 645        /* Try to load the entire request, if we can fit it into the
 646         * allocated buffer space we can use HTTP/1.0 and avoid the
 647         * chunked encoding mess.
 648         */
 649        while (1) {
 650                size_t left = rpc->alloc - rpc->len;
 651                char *buf = rpc->buf + rpc->len;
 652                int n;
 653
 654                if (left < LARGE_PACKET_MAX) {
 655                        large_request = 1;
 656                        use_gzip = 0;
 657                        break;
 658                }
 659
 660                n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 661                if (!n)
 662                        break;
 663                rpc->len += n;
 664        }
 665
 666        if (large_request) {
 667                struct slot_results results;
 668
 669                do {
 670                        err = probe_rpc(rpc, &results);
 671                        if (err == HTTP_REAUTH)
 672                                credential_fill(&http_auth);
 673                } while (err == HTTP_REAUTH);
 674                if (err != HTTP_OK)
 675                        return -1;
 676
 677                if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 678                        needs_100_continue = 1;
 679        }
 680
 681        headers = curl_slist_append(headers, rpc->hdr_content_type);
 682        headers = curl_slist_append(headers, rpc->hdr_accept);
 683        headers = curl_slist_append(headers, needs_100_continue ?
 684                "Expect: 100-continue" : "Expect:");
 685
 686        /* Add the extra Git-Protocol header */
 687        if (rpc->protocol_header)
 688                headers = curl_slist_append(headers, rpc->protocol_header);
 689
 690retry:
 691        slot = get_active_slot();
 692
 693        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 694        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 695        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 696        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 697
 698        if (large_request) {
 699                /* The request body is large and the size cannot be predicted.
 700                 * We must use chunked encoding to send it.
 701                 */
 702                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 703                rpc->initial_buffer = 1;
 704                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 705                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 706#ifndef NO_CURL_IOCTL
 707                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 708                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 709#endif
 710                if (options.verbosity > 1) {
 711                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 712                        fflush(stderr);
 713                }
 714
 715        } else if (gzip_body) {
 716                /*
 717                 * If we are looping to retry authentication, then the previous
 718                 * run will have set up the headers and gzip buffer already,
 719                 * and we just need to send it.
 720                 */
 721                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 722                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 723
 724        } else if (use_gzip && 1024 < rpc->len) {
 725                /* The client backend isn't giving us compressed data so
 726                 * we can try to deflate it ourselves, this may save on
 727                 * the transfer time.
 728                 */
 729                git_zstream stream;
 730                int ret;
 731
 732                git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 733                gzip_size = git_deflate_bound(&stream, rpc->len);
 734                gzip_body = xmalloc(gzip_size);
 735
 736                stream.next_in = (unsigned char *)rpc->buf;
 737                stream.avail_in = rpc->len;
 738                stream.next_out = (unsigned char *)gzip_body;
 739                stream.avail_out = gzip_size;
 740
 741                ret = git_deflate(&stream, Z_FINISH);
 742                if (ret != Z_STREAM_END)
 743                        die("cannot deflate request; zlib deflate error %d", ret);
 744
 745                ret = git_deflate_end_gently(&stream);
 746                if (ret != Z_OK)
 747                        die("cannot deflate request; zlib end error %d", ret);
 748
 749                gzip_size = stream.total_out;
 750
 751                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 752                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 753                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 754
 755                if (options.verbosity > 1) {
 756                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 757                                rpc->service_name,
 758                                (unsigned long)rpc->len, (unsigned long)gzip_size);
 759                        fflush(stderr);
 760                }
 761        } else {
 762                /* We know the complete request size in advance, use the
 763                 * more normal Content-Length approach.
 764                 */
 765                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 766                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(rpc->len));
 767                if (options.verbosity > 1) {
 768                        fprintf(stderr, "POST %s (%lu bytes)\n",
 769                                rpc->service_name, (unsigned long)rpc->len);
 770                        fflush(stderr);
 771                }
 772        }
 773
 774        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 775        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 776        rpc_in_data.rpc = rpc;
 777        curl_easy_setopt(slot->curl, CURLOPT_FILE, &rpc_in_data);
 778
 779
 780        rpc->any_written = 0;
 781        err = run_slot(slot, NULL);
 782        if (err == HTTP_REAUTH && !large_request) {
 783                credential_fill(&http_auth);
 784                goto retry;
 785        }
 786        if (err != HTTP_OK)
 787                err = -1;
 788
 789        if (!rpc->any_written)
 790                err = -1;
 791
 792        curl_slist_free_all(headers);
 793        free(gzip_body);
 794        return err;
 795}
 796
 797static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 798{
 799        const char *svc = rpc->service_name;
 800        struct strbuf buf = STRBUF_INIT;
 801        struct strbuf *preamble = rpc->stdin_preamble;
 802        struct child_process client = CHILD_PROCESS_INIT;
 803        int err = 0;
 804
 805        client.in = -1;
 806        client.out = -1;
 807        client.git_cmd = 1;
 808        client.argv = rpc->argv;
 809        if (start_command(&client))
 810                exit(1);
 811        if (preamble)
 812                write_or_die(client.in, preamble->buf, preamble->len);
 813        if (heads)
 814                write_or_die(client.in, heads->buf, heads->len);
 815
 816        rpc->alloc = http_post_buffer;
 817        rpc->buf = xmalloc(rpc->alloc);
 818        rpc->in = client.in;
 819        rpc->out = client.out;
 820        strbuf_init(&rpc->result, 0);
 821
 822        strbuf_addf(&buf, "%s%s", url.buf, svc);
 823        rpc->service_url = strbuf_detach(&buf, NULL);
 824
 825        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 826        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 827
 828        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 829        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 830
 831        if (get_protocol_http_header(heads->version, &buf))
 832                rpc->protocol_header = strbuf_detach(&buf, NULL);
 833        else
 834                rpc->protocol_header = NULL;
 835
 836        while (!err) {
 837                int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 838                if (!n)
 839                        break;
 840                rpc->pos = 0;
 841                rpc->len = n;
 842                err |= post_rpc(rpc);
 843        }
 844
 845        close(client.in);
 846        client.in = -1;
 847        if (!err) {
 848                strbuf_read(&rpc->result, client.out, 0);
 849        } else {
 850                char buf[4096];
 851                for (;;)
 852                        if (xread(client.out, buf, sizeof(buf)) <= 0)
 853                                break;
 854        }
 855
 856        close(client.out);
 857        client.out = -1;
 858
 859        err |= finish_command(&client);
 860        free(rpc->service_url);
 861        free(rpc->hdr_content_type);
 862        free(rpc->hdr_accept);
 863        free(rpc->protocol_header);
 864        free(rpc->buf);
 865        strbuf_release(&buf);
 866        return err;
 867}
 868
 869static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 870{
 871        struct walker *walker;
 872        char **targets;
 873        int ret, i;
 874
 875        ALLOC_ARRAY(targets, nr_heads);
 876        if (options.depth || options.deepen_since)
 877                die("dumb http transport does not support shallow capabilities");
 878        for (i = 0; i < nr_heads; i++)
 879                targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
 880
 881        walker = get_http_walker(url.buf);
 882        walker->get_verbosely = options.verbosity >= 3;
 883        walker->get_recover = 0;
 884        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 885        walker_free(walker);
 886
 887        for (i = 0; i < nr_heads; i++)
 888                free(targets[i]);
 889        free(targets);
 890
 891        return ret ? error("fetch failed.") : 0;
 892}
 893
 894static int fetch_git(struct discovery *heads,
 895        int nr_heads, struct ref **to_fetch)
 896{
 897        struct rpc_state rpc;
 898        struct strbuf preamble = STRBUF_INIT;
 899        int i, err;
 900        struct argv_array args = ARGV_ARRAY_INIT;
 901
 902        argv_array_pushl(&args, "fetch-pack", "--stateless-rpc",
 903                         "--stdin", "--lock-pack", NULL);
 904        if (options.followtags)
 905                argv_array_push(&args, "--include-tag");
 906        if (options.thin)
 907                argv_array_push(&args, "--thin");
 908        if (options.verbosity >= 3)
 909                argv_array_pushl(&args, "-v", "-v", NULL);
 910        if (options.check_self_contained_and_connected)
 911                argv_array_push(&args, "--check-self-contained-and-connected");
 912        if (options.cloning)
 913                argv_array_push(&args, "--cloning");
 914        if (options.update_shallow)
 915                argv_array_push(&args, "--update-shallow");
 916        if (!options.progress)
 917                argv_array_push(&args, "--no-progress");
 918        if (options.depth)
 919                argv_array_pushf(&args, "--depth=%lu", options.depth);
 920        if (options.deepen_since)
 921                argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since);
 922        for (i = 0; i < options.deepen_not.nr; i++)
 923                argv_array_pushf(&args, "--shallow-exclude=%s",
 924                                 options.deepen_not.items[i].string);
 925        if (options.deepen_relative && options.depth)
 926                argv_array_push(&args, "--deepen-relative");
 927        if (options.from_promisor)
 928                argv_array_push(&args, "--from-promisor");
 929        if (options.no_dependents)
 930                argv_array_push(&args, "--no-dependents");
 931        if (options.filter)
 932                argv_array_pushf(&args, "--filter=%s", options.filter);
 933        argv_array_push(&args, url.buf);
 934
 935        for (i = 0; i < nr_heads; i++) {
 936                struct ref *ref = to_fetch[i];
 937                if (!*ref->name)
 938                        die("cannot fetch by sha1 over smart http");
 939                packet_buf_write(&preamble, "%s %s\n",
 940                                 oid_to_hex(&ref->old_oid), ref->name);
 941        }
 942        packet_buf_flush(&preamble);
 943
 944        memset(&rpc, 0, sizeof(rpc));
 945        rpc.service_name = "git-upload-pack",
 946        rpc.argv = args.argv;
 947        rpc.stdin_preamble = &preamble;
 948        rpc.gzip_request = 1;
 949
 950        err = rpc_service(&rpc, heads);
 951        if (rpc.result.len)
 952                write_or_die(1, rpc.result.buf, rpc.result.len);
 953        strbuf_release(&rpc.result);
 954        strbuf_release(&preamble);
 955        argv_array_clear(&args);
 956        return err;
 957}
 958
 959static int fetch(int nr_heads, struct ref **to_fetch)
 960{
 961        struct discovery *d = discover_refs("git-upload-pack", 0);
 962        if (d->proto_git)
 963                return fetch_git(d, nr_heads, to_fetch);
 964        else
 965                return fetch_dumb(nr_heads, to_fetch);
 966}
 967
 968static void parse_fetch(struct strbuf *buf)
 969{
 970        struct ref **to_fetch = NULL;
 971        struct ref *list_head = NULL;
 972        struct ref **list = &list_head;
 973        int alloc_heads = 0, nr_heads = 0;
 974
 975        do {
 976                const char *p;
 977                if (skip_prefix(buf->buf, "fetch ", &p)) {
 978                        const char *name;
 979                        struct ref *ref;
 980                        struct object_id old_oid;
 981
 982                        if (get_oid_hex(p, &old_oid))
 983                                die("protocol error: expected sha/ref, got %s'", p);
 984                        if (p[GIT_SHA1_HEXSZ] == ' ')
 985                                name = p + GIT_SHA1_HEXSZ + 1;
 986                        else if (!p[GIT_SHA1_HEXSZ])
 987                                name = "";
 988                        else
 989                                die("protocol error: expected sha/ref, got %s'", p);
 990
 991                        ref = alloc_ref(name);
 992                        oidcpy(&ref->old_oid, &old_oid);
 993
 994                        *list = ref;
 995                        list = &ref->next;
 996
 997                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 998                        to_fetch[nr_heads++] = ref;
 999                }
1000                else
1001                        die("http transport does not support %s", buf->buf);
1002
1003                strbuf_reset(buf);
1004                if (strbuf_getline_lf(buf, stdin) == EOF)
1005                        return;
1006                if (!*buf->buf)
1007                        break;
1008        } while (1);
1009
1010        if (fetch(nr_heads, to_fetch))
1011                exit(128); /* error already reported */
1012        free_refs(list_head);
1013        free(to_fetch);
1014
1015        printf("\n");
1016        fflush(stdout);
1017        strbuf_reset(buf);
1018}
1019
1020static int push_dav(int nr_spec, char **specs)
1021{
1022        struct child_process child = CHILD_PROCESS_INIT;
1023        size_t i;
1024
1025        child.git_cmd = 1;
1026        argv_array_push(&child.args, "http-push");
1027        argv_array_push(&child.args, "--helper-status");
1028        if (options.dry_run)
1029                argv_array_push(&child.args, "--dry-run");
1030        if (options.verbosity > 1)
1031                argv_array_push(&child.args, "--verbose");
1032        argv_array_push(&child.args, url.buf);
1033        for (i = 0; i < nr_spec; i++)
1034                argv_array_push(&child.args, specs[i]);
1035
1036        if (run_command(&child))
1037                die("git-http-push failed");
1038        return 0;
1039}
1040
1041static int push_git(struct discovery *heads, int nr_spec, char **specs)
1042{
1043        struct rpc_state rpc;
1044        int i, err;
1045        struct argv_array args;
1046        struct string_list_item *cas_option;
1047        struct strbuf preamble = STRBUF_INIT;
1048
1049        argv_array_init(&args);
1050        argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
1051                         NULL);
1052
1053        if (options.thin)
1054                argv_array_push(&args, "--thin");
1055        if (options.dry_run)
1056                argv_array_push(&args, "--dry-run");
1057        if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
1058                argv_array_push(&args, "--signed=yes");
1059        else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
1060                argv_array_push(&args, "--signed=if-asked");
1061        if (options.verbosity == 0)
1062                argv_array_push(&args, "--quiet");
1063        else if (options.verbosity > 1)
1064                argv_array_push(&args, "--verbose");
1065        for (i = 0; i < options.push_options.nr; i++)
1066                argv_array_pushf(&args, "--push-option=%s",
1067                                 options.push_options.items[i].string);
1068        argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
1069        for_each_string_list_item(cas_option, &cas_options)
1070                argv_array_push(&args, cas_option->string);
1071        argv_array_push(&args, url.buf);
1072
1073        argv_array_push(&args, "--stdin");
1074        for (i = 0; i < nr_spec; i++)
1075                packet_buf_write(&preamble, "%s\n", specs[i]);
1076        packet_buf_flush(&preamble);
1077
1078        memset(&rpc, 0, sizeof(rpc));
1079        rpc.service_name = "git-receive-pack",
1080        rpc.argv = args.argv;
1081        rpc.stdin_preamble = &preamble;
1082
1083        err = rpc_service(&rpc, heads);
1084        if (rpc.result.len)
1085                write_or_die(1, rpc.result.buf, rpc.result.len);
1086        strbuf_release(&rpc.result);
1087        strbuf_release(&preamble);
1088        argv_array_clear(&args);
1089        return err;
1090}
1091
1092static int push(int nr_spec, char **specs)
1093{
1094        struct discovery *heads = discover_refs("git-receive-pack", 1);
1095        int ret;
1096
1097        if (heads->proto_git)
1098                ret = push_git(heads, nr_spec, specs);
1099        else
1100                ret = push_dav(nr_spec, specs);
1101        free_discovery(heads);
1102        return ret;
1103}
1104
1105static void parse_push(struct strbuf *buf)
1106{
1107        char **specs = NULL;
1108        int alloc_spec = 0, nr_spec = 0, i, ret;
1109
1110        do {
1111                if (starts_with(buf->buf, "push ")) {
1112                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
1113                        specs[nr_spec++] = xstrdup(buf->buf + 5);
1114                }
1115                else
1116                        die("http transport does not support %s", buf->buf);
1117
1118                strbuf_reset(buf);
1119                if (strbuf_getline_lf(buf, stdin) == EOF)
1120                        goto free_specs;
1121                if (!*buf->buf)
1122                        break;
1123        } while (1);
1124
1125        ret = push(nr_spec, specs);
1126        printf("\n");
1127        fflush(stdout);
1128
1129        if (ret)
1130                exit(128); /* error already reported */
1131
1132 free_specs:
1133        for (i = 0; i < nr_spec; i++)
1134                free(specs[i]);
1135        free(specs);
1136}
1137
1138/*
1139 * Used to represent the state of a connection to an HTTP server when
1140 * communicating using git's wire-protocol version 2.
1141 */
1142struct proxy_state {
1143        char *service_name;
1144        char *service_url;
1145        struct curl_slist *headers;
1146        struct strbuf request_buffer;
1147        int in;
1148        int out;
1149        struct packet_reader reader;
1150        size_t pos;
1151        int seen_flush;
1152};
1153
1154static void proxy_state_init(struct proxy_state *p, const char *service_name,
1155                             enum protocol_version version)
1156{
1157        struct strbuf buf = STRBUF_INIT;
1158
1159        memset(p, 0, sizeof(*p));
1160        p->service_name = xstrdup(service_name);
1161
1162        p->in = 0;
1163        p->out = 1;
1164        strbuf_init(&p->request_buffer, 0);
1165
1166        strbuf_addf(&buf, "%s%s", url.buf, p->service_name);
1167        p->service_url = strbuf_detach(&buf, NULL);
1168
1169        p->headers = http_copy_default_headers();
1170
1171        strbuf_addf(&buf, "Content-Type: application/x-%s-request", p->service_name);
1172        p->headers = curl_slist_append(p->headers, buf.buf);
1173        strbuf_reset(&buf);
1174
1175        strbuf_addf(&buf, "Accept: application/x-%s-result", p->service_name);
1176        p->headers = curl_slist_append(p->headers, buf.buf);
1177        strbuf_reset(&buf);
1178
1179        p->headers = curl_slist_append(p->headers, "Transfer-Encoding: chunked");
1180
1181        /* Add the Git-Protocol header */
1182        if (get_protocol_http_header(version, &buf))
1183                p->headers = curl_slist_append(p->headers, buf.buf);
1184
1185        packet_reader_init(&p->reader, p->in, NULL, 0,
1186                           PACKET_READ_GENTLE_ON_EOF);
1187
1188        strbuf_release(&buf);
1189}
1190
1191static void proxy_state_clear(struct proxy_state *p)
1192{
1193        free(p->service_name);
1194        free(p->service_url);
1195        curl_slist_free_all(p->headers);
1196        strbuf_release(&p->request_buffer);
1197}
1198
1199/*
1200 * CURLOPT_READFUNCTION callback function.
1201 * Attempts to copy over a single packet-line at a time into the
1202 * curl provided buffer.
1203 */
1204static size_t proxy_in(char *buffer, size_t eltsize,
1205                       size_t nmemb, void *userdata)
1206{
1207        size_t max;
1208        struct proxy_state *p = userdata;
1209        size_t avail = p->request_buffer.len - p->pos;
1210
1211
1212        if (eltsize != 1)
1213                BUG("curl read callback called with size = %"PRIuMAX" != 1",
1214                    (uintmax_t)eltsize);
1215        max = nmemb;
1216
1217        if (!avail) {
1218                if (p->seen_flush) {
1219                        p->seen_flush = 0;
1220                        return 0;
1221                }
1222
1223                strbuf_reset(&p->request_buffer);
1224                switch (packet_reader_read(&p->reader)) {
1225                case PACKET_READ_EOF:
1226                        die("unexpected EOF when reading from parent process");
1227                case PACKET_READ_NORMAL:
1228                        packet_buf_write_len(&p->request_buffer, p->reader.line,
1229                                             p->reader.pktlen);
1230                        break;
1231                case PACKET_READ_DELIM:
1232                        packet_buf_delim(&p->request_buffer);
1233                        break;
1234                case PACKET_READ_FLUSH:
1235                        packet_buf_flush(&p->request_buffer);
1236                        p->seen_flush = 1;
1237                        break;
1238                }
1239                p->pos = 0;
1240                avail = p->request_buffer.len;
1241        }
1242
1243        if (max < avail)
1244                avail = max;
1245        memcpy(buffer, p->request_buffer.buf + p->pos, avail);
1246        p->pos += avail;
1247        return avail;
1248}
1249
1250static size_t proxy_out(char *buffer, size_t eltsize,
1251                        size_t nmemb, void *userdata)
1252{
1253        size_t size;
1254        struct proxy_state *p = userdata;
1255
1256        if (eltsize != 1)
1257                BUG("curl read callback called with size = %"PRIuMAX" != 1",
1258                    (uintmax_t)eltsize);
1259        size = nmemb;
1260
1261        write_or_die(p->out, buffer, size);
1262        return size;
1263}
1264
1265/* Issues a request to the HTTP server configured in `p` */
1266static int proxy_request(struct proxy_state *p)
1267{
1268        struct active_request_slot *slot;
1269
1270        slot = get_active_slot();
1271
1272        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
1273        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1274        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
1275        curl_easy_setopt(slot->curl, CURLOPT_URL, p->service_url);
1276        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, p->headers);
1277
1278        /* Setup function to read request from client */
1279        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, proxy_in);
1280        curl_easy_setopt(slot->curl, CURLOPT_READDATA, p);
1281
1282        /* Setup function to write server response to client */
1283        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, proxy_out);
1284        curl_easy_setopt(slot->curl, CURLOPT_WRITEDATA, p);
1285
1286        if (run_slot(slot, NULL) != HTTP_OK)
1287                return -1;
1288
1289        return 0;
1290}
1291
1292static int stateless_connect(const char *service_name)
1293{
1294        struct discovery *discover;
1295        struct proxy_state p;
1296
1297        /*
1298         * Run the info/refs request and see if the server supports protocol
1299         * v2.  If and only if the server supports v2 can we successfully
1300         * establish a stateless connection, otherwise we need to tell the
1301         * client to fallback to using other transport helper functions to
1302         * complete their request.
1303         */
1304        discover = discover_refs(service_name, 0);
1305        if (discover->version != protocol_v2) {
1306                printf("fallback\n");
1307                fflush(stdout);
1308                return -1;
1309        } else {
1310                /* Stateless Connection established */
1311                printf("\n");
1312                fflush(stdout);
1313        }
1314
1315        proxy_state_init(&p, service_name, discover->version);
1316
1317        /*
1318         * Dump the capability listing that we got from the server earlier
1319         * during the info/refs request.
1320         */
1321        write_or_die(p.out, discover->buf, discover->len);
1322
1323        /* Peek the next packet line.  Until we see EOF keep sending POSTs */
1324        while (packet_reader_peek(&p.reader) != PACKET_READ_EOF) {
1325                if (proxy_request(&p)) {
1326                        /* We would have an err here */
1327                        break;
1328                }
1329        }
1330
1331        proxy_state_clear(&p);
1332        return 0;
1333}
1334
1335int cmd_main(int argc, const char **argv)
1336{
1337        struct strbuf buf = STRBUF_INIT;
1338        int nongit;
1339
1340        setup_git_directory_gently(&nongit);
1341        if (argc < 2) {
1342                error("remote-curl: usage: git remote-curl <remote> [<url>]");
1343                return 1;
1344        }
1345
1346        options.verbosity = 1;
1347        options.progress = !!isatty(2);
1348        options.thin = 1;
1349        string_list_init(&options.deepen_not, 1);
1350        string_list_init(&options.push_options, 1);
1351
1352        remote = remote_get(argv[1]);
1353
1354        if (argc > 2) {
1355                end_url_with_slash(&url, argv[2]);
1356        } else {
1357                end_url_with_slash(&url, remote->url[0]);
1358        }
1359
1360        http_init(remote, url.buf, 0);
1361
1362        do {
1363                const char *arg;
1364
1365                if (strbuf_getline_lf(&buf, stdin) == EOF) {
1366                        if (ferror(stdin))
1367                                error("remote-curl: error reading command stream from git");
1368                        return 1;
1369                }
1370                if (buf.len == 0)
1371                        break;
1372                if (starts_with(buf.buf, "fetch ")) {
1373                        if (nongit)
1374                                die("remote-curl: fetch attempted without a local repo");
1375                        parse_fetch(&buf);
1376
1377                } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1378                        int for_push = !!strstr(buf.buf + 4, "for-push");
1379                        output_refs(get_refs(for_push));
1380
1381                } else if (starts_with(buf.buf, "push ")) {
1382                        parse_push(&buf);
1383
1384                } else if (skip_prefix(buf.buf, "option ", &arg)) {
1385                        char *value = strchr(arg, ' ');
1386                        int result;
1387
1388                        if (value)
1389                                *value++ = '\0';
1390                        else
1391                                value = "true";
1392
1393                        result = set_option(arg, value);
1394                        if (!result)
1395                                printf("ok\n");
1396                        else if (result < 0)
1397                                printf("error invalid value\n");
1398                        else
1399                                printf("unsupported\n");
1400                        fflush(stdout);
1401
1402                } else if (!strcmp(buf.buf, "capabilities")) {
1403                        printf("stateless-connect\n");
1404                        printf("fetch\n");
1405                        printf("option\n");
1406                        printf("push\n");
1407                        printf("check-connectivity\n");
1408                        printf("\n");
1409                        fflush(stdout);
1410                } else if (skip_prefix(buf.buf, "stateless-connect ", &arg)) {
1411                        if (!stateless_connect(arg))
1412                                break;
1413                } else {
1414                        error("remote-curl: unknown command '%s' from git", buf.buf);
1415                        return 1;
1416                }
1417                strbuf_reset(&buf);
1418        } while (1);
1419
1420        http_cleanup();
1421
1422        return 0;
1423}