Andrew's git / gitweb.git / remote-curl.c
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remote-curl.con commit pack-protocol.txt: accept error packets in any context (2d103c3)
   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                           PACKET_READ_DIE_ON_ERR_PACKET);
 209
 210        heads->version = discover_version(&reader);
 211        switch (heads->version) {
 212        case protocol_v2:
 213                /*
 214                 * Do nothing.  This isn't a list of refs but rather a
 215                 * capability advertisement.  Client would have run
 216                 * 'stateless-connect' so we'll dump this capability listing
 217                 * and let them request the refs themselves.
 218                 */
 219                break;
 220        case protocol_v1:
 221        case protocol_v0:
 222                get_remote_heads(&reader, &list, for_push ? REF_NORMAL : 0,
 223                                 NULL, &heads->shallow);
 224                break;
 225        case protocol_unknown_version:
 226                BUG("unknown protocol version");
 227        }
 228
 229        return list;
 230}
 231
 232static struct ref *parse_info_refs(struct discovery *heads)
 233{
 234        char *data, *start, *mid;
 235        char *ref_name;
 236        int i = 0;
 237
 238        struct ref *refs = NULL;
 239        struct ref *ref = NULL;
 240        struct ref *last_ref = NULL;
 241
 242        data = heads->buf;
 243        start = NULL;
 244        mid = data;
 245        while (i < heads->len) {
 246                if (!start) {
 247                        start = &data[i];
 248                }
 249                if (data[i] == '\t')
 250                        mid = &data[i];
 251                if (data[i] == '\n') {
 252                        if (mid - start != 40)
 253                                die("%sinfo/refs not valid: is this a git repository?",
 254                                    url.buf);
 255                        data[i] = 0;
 256                        ref_name = mid + 1;
 257                        ref = alloc_ref(ref_name);
 258                        get_oid_hex(start, &ref->old_oid);
 259                        if (!refs)
 260                                refs = ref;
 261                        if (last_ref)
 262                                last_ref->next = ref;
 263                        last_ref = ref;
 264                        start = NULL;
 265                }
 266                i++;
 267        }
 268
 269        ref = alloc_ref("HEAD");
 270        if (!http_fetch_ref(url.buf, ref) &&
 271            !resolve_remote_symref(ref, refs)) {
 272                ref->next = refs;
 273                refs = ref;
 274        } else {
 275                free(ref);
 276        }
 277
 278        return refs;
 279}
 280
 281static void free_discovery(struct discovery *d)
 282{
 283        if (d) {
 284                if (d == last_discovery)
 285                        last_discovery = NULL;
 286                free(d->shallow.oid);
 287                free(d->buf_alloc);
 288                free_refs(d->refs);
 289                free(d->service);
 290                free(d);
 291        }
 292}
 293
 294static int show_http_message(struct strbuf *type, struct strbuf *charset,
 295                             struct strbuf *msg)
 296{
 297        const char *p, *eol;
 298
 299        /*
 300         * We only show text/plain parts, as other types are likely
 301         * to be ugly to look at on the user's terminal.
 302         */
 303        if (strcmp(type->buf, "text/plain"))
 304                return -1;
 305        if (charset->len)
 306                strbuf_reencode(msg, charset->buf, get_log_output_encoding());
 307
 308        strbuf_trim(msg);
 309        if (!msg->len)
 310                return -1;
 311
 312        p = msg->buf;
 313        do {
 314                eol = strchrnul(p, '\n');
 315                fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 316                p = eol + 1;
 317        } while(*eol);
 318        return 0;
 319}
 320
 321static int get_protocol_http_header(enum protocol_version version,
 322                                    struct strbuf *header)
 323{
 324        if (version > 0) {
 325                strbuf_addf(header, GIT_PROTOCOL_HEADER ": version=%d",
 326                            version);
 327
 328                return 1;
 329        }
 330
 331        return 0;
 332}
 333
 334static struct discovery *discover_refs(const char *service, int for_push)
 335{
 336        struct strbuf exp = STRBUF_INIT;
 337        struct strbuf type = STRBUF_INIT;
 338        struct strbuf charset = STRBUF_INIT;
 339        struct strbuf buffer = STRBUF_INIT;
 340        struct strbuf refs_url = STRBUF_INIT;
 341        struct strbuf effective_url = STRBUF_INIT;
 342        struct strbuf protocol_header = STRBUF_INIT;
 343        struct string_list extra_headers = STRING_LIST_INIT_DUP;
 344        struct discovery *last = last_discovery;
 345        int http_ret, maybe_smart = 0;
 346        struct http_get_options http_options;
 347        enum protocol_version version = get_protocol_version_config();
 348
 349        if (last && !strcmp(service, last->service))
 350                return last;
 351        free_discovery(last);
 352
 353        strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 354        if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 355             git_env_bool("GIT_SMART_HTTP", 1)) {
 356                maybe_smart = 1;
 357                if (!strchr(url.buf, '?'))
 358                        strbuf_addch(&refs_url, '?');
 359                else
 360                        strbuf_addch(&refs_url, '&');
 361                strbuf_addf(&refs_url, "service=%s", service);
 362        }
 363
 364        /*
 365         * NEEDSWORK: If we are trying to use protocol v2 and we are planning
 366         * to perform a push, then fallback to v0 since the client doesn't know
 367         * how to push yet using v2.
 368         */
 369        if (version == protocol_v2 && !strcmp("git-receive-pack", service))
 370                version = protocol_v0;
 371
 372        /* Add the extra Git-Protocol header */
 373        if (get_protocol_http_header(version, &protocol_header))
 374                string_list_append(&extra_headers, protocol_header.buf);
 375
 376        memset(&http_options, 0, sizeof(http_options));
 377        http_options.content_type = &type;
 378        http_options.charset = &charset;
 379        http_options.effective_url = &effective_url;
 380        http_options.base_url = &url;
 381        http_options.extra_headers = &extra_headers;
 382        http_options.initial_request = 1;
 383        http_options.no_cache = 1;
 384        http_options.keep_error = 1;
 385
 386        http_ret = http_get_strbuf(refs_url.buf, &buffer, &http_options);
 387        switch (http_ret) {
 388        case HTTP_OK:
 389                break;
 390        case HTTP_MISSING_TARGET:
 391                show_http_message(&type, &charset, &buffer);
 392                die("repository '%s' not found", url.buf);
 393        case HTTP_NOAUTH:
 394                show_http_message(&type, &charset, &buffer);
 395                die("Authentication failed for '%s'", url.buf);
 396        default:
 397                show_http_message(&type, &charset, &buffer);
 398                die("unable to access '%s': %s", url.buf, curl_errorstr);
 399        }
 400
 401        if (options.verbosity && !starts_with(refs_url.buf, url.buf))
 402                warning(_("redirecting to %s"), url.buf);
 403
 404        last= xcalloc(1, sizeof(*last_discovery));
 405        last->service = xstrdup(service);
 406        last->buf_alloc = strbuf_detach(&buffer, &last->len);
 407        last->buf = last->buf_alloc;
 408
 409        strbuf_addf(&exp, "application/x-%s-advertisement", service);
 410        if (maybe_smart &&
 411            (5 <= last->len && last->buf[4] == '#') &&
 412            !strbuf_cmp(&exp, &type)) {
 413                struct packet_reader reader;
 414                packet_reader_init(&reader, -1, last->buf, last->len,
 415                                   PACKET_READ_CHOMP_NEWLINE |
 416                                   PACKET_READ_DIE_ON_ERR_PACKET);
 417
 418                /*
 419                 * smart HTTP response; validate that the service
 420                 * pkt-line matches our request.
 421                 */
 422                if (packet_reader_read(&reader) != PACKET_READ_NORMAL)
 423                        die("invalid server response; expected service, got flush packet");
 424
 425                strbuf_reset(&exp);
 426                strbuf_addf(&exp, "# service=%s", service);
 427                if (strcmp(reader.line, exp.buf))
 428                        die("invalid server response; got '%s'", reader.line);
 429                strbuf_release(&exp);
 430
 431                /* The header can include additional metadata lines, up
 432                 * until a packet flush marker.  Ignore these now, but
 433                 * in the future we might start to scan them.
 434                 */
 435                for (;;) {
 436                        packet_reader_read(&reader);
 437                        if (reader.pktlen <= 0) {
 438                                break;
 439                        }
 440                }
 441
 442                last->buf = reader.src_buffer;
 443                last->len = reader.src_len;
 444
 445                last->proto_git = 1;
 446        } else if (maybe_smart &&
 447                   last->len > 5 && starts_with(last->buf + 4, "version 2")) {
 448                last->proto_git = 1;
 449        }
 450
 451        if (last->proto_git)
 452                last->refs = parse_git_refs(last, for_push);
 453        else
 454                last->refs = parse_info_refs(last);
 455
 456        strbuf_release(&refs_url);
 457        strbuf_release(&exp);
 458        strbuf_release(&type);
 459        strbuf_release(&charset);
 460        strbuf_release(&effective_url);
 461        strbuf_release(&buffer);
 462        strbuf_release(&protocol_header);
 463        string_list_clear(&extra_headers, 0);
 464        last_discovery = last;
 465        return last;
 466}
 467
 468static struct ref *get_refs(int for_push)
 469{
 470        struct discovery *heads;
 471
 472        if (for_push)
 473                heads = discover_refs("git-receive-pack", for_push);
 474        else
 475                heads = discover_refs("git-upload-pack", for_push);
 476
 477        return heads->refs;
 478}
 479
 480static void output_refs(struct ref *refs)
 481{
 482        struct ref *posn;
 483        for (posn = refs; posn; posn = posn->next) {
 484                if (posn->symref)
 485                        printf("@%s %s\n", posn->symref, posn->name);
 486                else
 487                        printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name);
 488        }
 489        printf("\n");
 490        fflush(stdout);
 491}
 492
 493struct rpc_state {
 494        const char *service_name;
 495        const char **argv;
 496        struct strbuf *stdin_preamble;
 497        char *service_url;
 498        char *hdr_content_type;
 499        char *hdr_accept;
 500        char *protocol_header;
 501        char *buf;
 502        size_t alloc;
 503        size_t len;
 504        size_t pos;
 505        int in;
 506        int out;
 507        int any_written;
 508        struct strbuf result;
 509        unsigned gzip_request : 1;
 510        unsigned initial_buffer : 1;
 511};
 512
 513static size_t rpc_out(void *ptr, size_t eltsize,
 514                size_t nmemb, void *buffer_)
 515{
 516        size_t max = eltsize * nmemb;
 517        struct rpc_state *rpc = buffer_;
 518        size_t avail = rpc->len - rpc->pos;
 519
 520        if (!avail) {
 521                rpc->initial_buffer = 0;
 522                avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 523                if (!avail)
 524                        return 0;
 525                rpc->pos = 0;
 526                rpc->len = avail;
 527        }
 528
 529        if (max < avail)
 530                avail = max;
 531        memcpy(ptr, rpc->buf + rpc->pos, avail);
 532        rpc->pos += avail;
 533        return avail;
 534}
 535
 536#ifndef NO_CURL_IOCTL
 537static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 538{
 539        struct rpc_state *rpc = clientp;
 540
 541        switch (cmd) {
 542        case CURLIOCMD_NOP:
 543                return CURLIOE_OK;
 544
 545        case CURLIOCMD_RESTARTREAD:
 546                if (rpc->initial_buffer) {
 547                        rpc->pos = 0;
 548                        return CURLIOE_OK;
 549                }
 550                error("unable to rewind rpc post data - try increasing http.postBuffer");
 551                return CURLIOE_FAILRESTART;
 552
 553        default:
 554                return CURLIOE_UNKNOWNCMD;
 555        }
 556}
 557#endif
 558
 559static size_t rpc_in(char *ptr, size_t eltsize,
 560                size_t nmemb, void *buffer_)
 561{
 562        size_t size = eltsize * nmemb;
 563        struct rpc_state *rpc = buffer_;
 564        if (size)
 565                rpc->any_written = 1;
 566        write_or_die(rpc->in, ptr, size);
 567        return size;
 568}
 569
 570static int run_slot(struct active_request_slot *slot,
 571                    struct slot_results *results)
 572{
 573        int err;
 574        struct slot_results results_buf;
 575
 576        if (!results)
 577                results = &results_buf;
 578
 579        err = run_one_slot(slot, results);
 580
 581        if (err != HTTP_OK && err != HTTP_REAUTH) {
 582                struct strbuf msg = STRBUF_INIT;
 583                if (results->http_code && results->http_code != 200)
 584                        strbuf_addf(&msg, "HTTP %ld", results->http_code);
 585                if (results->curl_result != CURLE_OK) {
 586                        if (msg.len)
 587                                strbuf_addch(&msg, ' ');
 588                        strbuf_addf(&msg, "curl %d", results->curl_result);
 589                        if (curl_errorstr[0]) {
 590                                strbuf_addch(&msg, ' ');
 591                                strbuf_addstr(&msg, curl_errorstr);
 592                        }
 593                }
 594                error("RPC failed; %s", msg.buf);
 595                strbuf_release(&msg);
 596        }
 597
 598        return err;
 599}
 600
 601static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 602{
 603        struct active_request_slot *slot;
 604        struct curl_slist *headers = http_copy_default_headers();
 605        struct strbuf buf = STRBUF_INIT;
 606        int err;
 607
 608        slot = get_active_slot();
 609
 610        headers = curl_slist_append(headers, rpc->hdr_content_type);
 611        headers = curl_slist_append(headers, rpc->hdr_accept);
 612
 613        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 614        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 615        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 616        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 617        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 618        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 619        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 620        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 621        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 622
 623        err = run_slot(slot, results);
 624
 625        curl_slist_free_all(headers);
 626        strbuf_release(&buf);
 627        return err;
 628}
 629
 630static curl_off_t xcurl_off_t(size_t len) {
 631        uintmax_t size = len;
 632        if (size > maximum_signed_value_of_type(curl_off_t))
 633                die("cannot handle pushes this big");
 634        return (curl_off_t)size;
 635}
 636
 637static int post_rpc(struct rpc_state *rpc)
 638{
 639        struct active_request_slot *slot;
 640        struct curl_slist *headers = http_copy_default_headers();
 641        int use_gzip = rpc->gzip_request;
 642        char *gzip_body = NULL;
 643        size_t gzip_size = 0;
 644        int err, large_request = 0;
 645        int needs_100_continue = 0;
 646
 647        /* Try to load the entire request, if we can fit it into the
 648         * allocated buffer space we can use HTTP/1.0 and avoid the
 649         * chunked encoding mess.
 650         */
 651        while (1) {
 652                size_t left = rpc->alloc - rpc->len;
 653                char *buf = rpc->buf + rpc->len;
 654                int n;
 655
 656                if (left < LARGE_PACKET_MAX) {
 657                        large_request = 1;
 658                        use_gzip = 0;
 659                        break;
 660                }
 661
 662                n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 663                if (!n)
 664                        break;
 665                rpc->len += n;
 666        }
 667
 668        if (large_request) {
 669                struct slot_results results;
 670
 671                do {
 672                        err = probe_rpc(rpc, &results);
 673                        if (err == HTTP_REAUTH)
 674                                credential_fill(&http_auth);
 675                } while (err == HTTP_REAUTH);
 676                if (err != HTTP_OK)
 677                        return -1;
 678
 679                if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 680                        needs_100_continue = 1;
 681        }
 682
 683        headers = curl_slist_append(headers, rpc->hdr_content_type);
 684        headers = curl_slist_append(headers, rpc->hdr_accept);
 685        headers = curl_slist_append(headers, needs_100_continue ?
 686                "Expect: 100-continue" : "Expect:");
 687
 688        /* Add the extra Git-Protocol header */
 689        if (rpc->protocol_header)
 690                headers = curl_slist_append(headers, rpc->protocol_header);
 691
 692retry:
 693        slot = get_active_slot();
 694
 695        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 696        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 697        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 698        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 699
 700        if (large_request) {
 701                /* The request body is large and the size cannot be predicted.
 702                 * We must use chunked encoding to send it.
 703                 */
 704                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 705                rpc->initial_buffer = 1;
 706                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 707                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 708#ifndef NO_CURL_IOCTL
 709                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 710                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 711#endif
 712                if (options.verbosity > 1) {
 713                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 714                        fflush(stderr);
 715                }
 716
 717        } else if (gzip_body) {
 718                /*
 719                 * If we are looping to retry authentication, then the previous
 720                 * run will have set up the headers and gzip buffer already,
 721                 * and we just need to send it.
 722                 */
 723                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 724                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 725
 726        } else if (use_gzip && 1024 < rpc->len) {
 727                /* The client backend isn't giving us compressed data so
 728                 * we can try to deflate it ourselves, this may save on
 729                 * the transfer time.
 730                 */
 731                git_zstream stream;
 732                int ret;
 733
 734                git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 735                gzip_size = git_deflate_bound(&stream, rpc->len);
 736                gzip_body = xmalloc(gzip_size);
 737
 738                stream.next_in = (unsigned char *)rpc->buf;
 739                stream.avail_in = rpc->len;
 740                stream.next_out = (unsigned char *)gzip_body;
 741                stream.avail_out = gzip_size;
 742
 743                ret = git_deflate(&stream, Z_FINISH);
 744                if (ret != Z_STREAM_END)
 745                        die("cannot deflate request; zlib deflate error %d", ret);
 746
 747                ret = git_deflate_end_gently(&stream);
 748                if (ret != Z_OK)
 749                        die("cannot deflate request; zlib end error %d", ret);
 750
 751                gzip_size = stream.total_out;
 752
 753                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 754                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 755                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 756
 757                if (options.verbosity > 1) {
 758                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 759                                rpc->service_name,
 760                                (unsigned long)rpc->len, (unsigned long)gzip_size);
 761                        fflush(stderr);
 762                }
 763        } else {
 764                /* We know the complete request size in advance, use the
 765                 * more normal Content-Length approach.
 766                 */
 767                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 768                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(rpc->len));
 769                if (options.verbosity > 1) {
 770                        fprintf(stderr, "POST %s (%lu bytes)\n",
 771                                rpc->service_name, (unsigned long)rpc->len);
 772                        fflush(stderr);
 773                }
 774        }
 775
 776        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 777        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 778        curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 779
 780
 781        rpc->any_written = 0;
 782        err = run_slot(slot, NULL);
 783        if (err == HTTP_REAUTH && !large_request) {
 784                credential_fill(&http_auth);
 785                goto retry;
 786        }
 787        if (err != HTTP_OK)
 788                err = -1;
 789
 790        if (!rpc->any_written)
 791                err = -1;
 792
 793        curl_slist_free_all(headers);
 794        free(gzip_body);
 795        return err;
 796}
 797
 798static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 799{
 800        const char *svc = rpc->service_name;
 801        struct strbuf buf = STRBUF_INIT;
 802        struct strbuf *preamble = rpc->stdin_preamble;
 803        struct child_process client = CHILD_PROCESS_INIT;
 804        int err = 0;
 805
 806        client.in = -1;
 807        client.out = -1;
 808        client.git_cmd = 1;
 809        client.argv = rpc->argv;
 810        if (start_command(&client))
 811                exit(1);
 812        if (preamble)
 813                write_or_die(client.in, preamble->buf, preamble->len);
 814        if (heads)
 815                write_or_die(client.in, heads->buf, heads->len);
 816
 817        rpc->alloc = http_post_buffer;
 818        rpc->buf = xmalloc(rpc->alloc);
 819        rpc->in = client.in;
 820        rpc->out = client.out;
 821        strbuf_init(&rpc->result, 0);
 822
 823        strbuf_addf(&buf, "%s%s", url.buf, svc);
 824        rpc->service_url = strbuf_detach(&buf, NULL);
 825
 826        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 827        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 828
 829        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 830        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 831
 832        if (get_protocol_http_header(heads->version, &buf))
 833                rpc->protocol_header = strbuf_detach(&buf, NULL);
 834        else
 835                rpc->protocol_header = NULL;
 836
 837        while (!err) {
 838                int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 839                if (!n)
 840                        break;
 841                rpc->pos = 0;
 842                rpc->len = n;
 843                err |= post_rpc(rpc);
 844        }
 845
 846        close(client.in);
 847        client.in = -1;
 848        if (!err) {
 849                strbuf_read(&rpc->result, client.out, 0);
 850        } else {
 851                char buf[4096];
 852                for (;;)
 853                        if (xread(client.out, buf, sizeof(buf)) <= 0)
 854                                break;
 855        }
 856
 857        close(client.out);
 858        client.out = -1;
 859
 860        err |= finish_command(&client);
 861        free(rpc->service_url);
 862        free(rpc->hdr_content_type);
 863        free(rpc->hdr_accept);
 864        free(rpc->protocol_header);
 865        free(rpc->buf);
 866        strbuf_release(&buf);
 867        return err;
 868}
 869
 870static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 871{
 872        struct walker *walker;
 873        char **targets;
 874        int ret, i;
 875
 876        ALLOC_ARRAY(targets, nr_heads);
 877        if (options.depth || options.deepen_since)
 878                die("dumb http transport does not support shallow capabilities");
 879        for (i = 0; i < nr_heads; i++)
 880                targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
 881
 882        walker = get_http_walker(url.buf);
 883        walker->get_verbosely = options.verbosity >= 3;
 884        walker->get_recover = 0;
 885        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 886        walker_free(walker);
 887
 888        for (i = 0; i < nr_heads; i++)
 889                free(targets[i]);
 890        free(targets);
 891
 892        return ret ? error("fetch failed.") : 0;
 893}
 894
 895static int fetch_git(struct discovery *heads,
 896        int nr_heads, struct ref **to_fetch)
 897{
 898        struct rpc_state rpc;
 899        struct strbuf preamble = STRBUF_INIT;
 900        int i, err;
 901        struct argv_array args = ARGV_ARRAY_INIT;
 902
 903        argv_array_pushl(&args, "fetch-pack", "--stateless-rpc",
 904                         "--stdin", "--lock-pack", NULL);
 905        if (options.followtags)
 906                argv_array_push(&args, "--include-tag");
 907        if (options.thin)
 908                argv_array_push(&args, "--thin");
 909        if (options.verbosity >= 3)
 910                argv_array_pushl(&args, "-v", "-v", NULL);
 911        if (options.check_self_contained_and_connected)
 912                argv_array_push(&args, "--check-self-contained-and-connected");
 913        if (options.cloning)
 914                argv_array_push(&args, "--cloning");
 915        if (options.update_shallow)
 916                argv_array_push(&args, "--update-shallow");
 917        if (!options.progress)
 918                argv_array_push(&args, "--no-progress");
 919        if (options.depth)
 920                argv_array_pushf(&args, "--depth=%lu", options.depth);
 921        if (options.deepen_since)
 922                argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since);
 923        for (i = 0; i < options.deepen_not.nr; i++)
 924                argv_array_pushf(&args, "--shallow-exclude=%s",
 925                                 options.deepen_not.items[i].string);
 926        if (options.deepen_relative && options.depth)
 927                argv_array_push(&args, "--deepen-relative");
 928        if (options.from_promisor)
 929                argv_array_push(&args, "--from-promisor");
 930        if (options.no_dependents)
 931                argv_array_push(&args, "--no-dependents");
 932        if (options.filter)
 933                argv_array_pushf(&args, "--filter=%s", options.filter);
 934        argv_array_push(&args, url.buf);
 935
 936        for (i = 0; i < nr_heads; i++) {
 937                struct ref *ref = to_fetch[i];
 938                if (!*ref->name)
 939                        die("cannot fetch by sha1 over smart http");
 940                packet_buf_write(&preamble, "%s %s\n",
 941                                 oid_to_hex(&ref->old_oid), ref->name);
 942        }
 943        packet_buf_flush(&preamble);
 944
 945        memset(&rpc, 0, sizeof(rpc));
 946        rpc.service_name = "git-upload-pack",
 947        rpc.argv = args.argv;
 948        rpc.stdin_preamble = &preamble;
 949        rpc.gzip_request = 1;
 950
 951        err = rpc_service(&rpc, heads);
 952        if (rpc.result.len)
 953                write_or_die(1, rpc.result.buf, rpc.result.len);
 954        strbuf_release(&rpc.result);
 955        strbuf_release(&preamble);
 956        argv_array_clear(&args);
 957        return err;
 958}
 959
 960static int fetch(int nr_heads, struct ref **to_fetch)
 961{
 962        struct discovery *d = discover_refs("git-upload-pack", 0);
 963        if (d->proto_git)
 964                return fetch_git(d, nr_heads, to_fetch);
 965        else
 966                return fetch_dumb(nr_heads, to_fetch);
 967}
 968
 969static void parse_fetch(struct strbuf *buf)
 970{
 971        struct ref **to_fetch = NULL;
 972        struct ref *list_head = NULL;
 973        struct ref **list = &list_head;
 974        int alloc_heads = 0, nr_heads = 0;
 975
 976        do {
 977                const char *p;
 978                if (skip_prefix(buf->buf, "fetch ", &p)) {
 979                        const char *name;
 980                        struct ref *ref;
 981                        struct object_id old_oid;
 982
 983                        if (get_oid_hex(p, &old_oid))
 984                                die("protocol error: expected sha/ref, got %s'", p);
 985                        if (p[GIT_SHA1_HEXSZ] == ' ')
 986                                name = p + GIT_SHA1_HEXSZ + 1;
 987                        else if (!p[GIT_SHA1_HEXSZ])
 988                                name = "";
 989                        else
 990                                die("protocol error: expected sha/ref, got %s'", p);
 991
 992                        ref = alloc_ref(name);
 993                        oidcpy(&ref->old_oid, &old_oid);
 994
 995                        *list = ref;
 996                        list = &ref->next;
 997
 998                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 999                        to_fetch[nr_heads++] = ref;
1000                }
1001                else
1002                        die("http transport does not support %s", buf->buf);
1003
1004                strbuf_reset(buf);
1005                if (strbuf_getline_lf(buf, stdin) == EOF)
1006                        return;
1007                if (!*buf->buf)
1008                        break;
1009        } while (1);
1010
1011        if (fetch(nr_heads, to_fetch))
1012                exit(128); /* error already reported */
1013        free_refs(list_head);
1014        free(to_fetch);
1015
1016        printf("\n");
1017        fflush(stdout);
1018        strbuf_reset(buf);
1019}
1020
1021static int push_dav(int nr_spec, char **specs)
1022{
1023        struct child_process child = CHILD_PROCESS_INIT;
1024        size_t i;
1025
1026        child.git_cmd = 1;
1027        argv_array_push(&child.args, "http-push");
1028        argv_array_push(&child.args, "--helper-status");
1029        if (options.dry_run)
1030                argv_array_push(&child.args, "--dry-run");
1031        if (options.verbosity > 1)
1032                argv_array_push(&child.args, "--verbose");
1033        argv_array_push(&child.args, url.buf);
1034        for (i = 0; i < nr_spec; i++)
1035                argv_array_push(&child.args, specs[i]);
1036
1037        if (run_command(&child))
1038                die("git-http-push failed");
1039        return 0;
1040}
1041
1042static int push_git(struct discovery *heads, int nr_spec, char **specs)
1043{
1044        struct rpc_state rpc;
1045        int i, err;
1046        struct argv_array args;
1047        struct string_list_item *cas_option;
1048        struct strbuf preamble = STRBUF_INIT;
1049
1050        argv_array_init(&args);
1051        argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
1052                         NULL);
1053
1054        if (options.thin)
1055                argv_array_push(&args, "--thin");
1056        if (options.dry_run)
1057                argv_array_push(&args, "--dry-run");
1058        if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
1059                argv_array_push(&args, "--signed=yes");
1060        else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
1061                argv_array_push(&args, "--signed=if-asked");
1062        if (options.verbosity == 0)
1063                argv_array_push(&args, "--quiet");
1064        else if (options.verbosity > 1)
1065                argv_array_push(&args, "--verbose");
1066        for (i = 0; i < options.push_options.nr; i++)
1067                argv_array_pushf(&args, "--push-option=%s",
1068                                 options.push_options.items[i].string);
1069        argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
1070        for_each_string_list_item(cas_option, &cas_options)
1071                argv_array_push(&args, cas_option->string);
1072        argv_array_push(&args, url.buf);
1073
1074        argv_array_push(&args, "--stdin");
1075        for (i = 0; i < nr_spec; i++)
1076                packet_buf_write(&preamble, "%s\n", specs[i]);
1077        packet_buf_flush(&preamble);
1078
1079        memset(&rpc, 0, sizeof(rpc));
1080        rpc.service_name = "git-receive-pack",
1081        rpc.argv = args.argv;
1082        rpc.stdin_preamble = &preamble;
1083
1084        err = rpc_service(&rpc, heads);
1085        if (rpc.result.len)
1086                write_or_die(1, rpc.result.buf, rpc.result.len);
1087        strbuf_release(&rpc.result);
1088        strbuf_release(&preamble);
1089        argv_array_clear(&args);
1090        return err;
1091}
1092
1093static int push(int nr_spec, char **specs)
1094{
1095        struct discovery *heads = discover_refs("git-receive-pack", 1);
1096        int ret;
1097
1098        if (heads->proto_git)
1099                ret = push_git(heads, nr_spec, specs);
1100        else
1101                ret = push_dav(nr_spec, specs);
1102        free_discovery(heads);
1103        return ret;
1104}
1105
1106static void parse_push(struct strbuf *buf)
1107{
1108        char **specs = NULL;
1109        int alloc_spec = 0, nr_spec = 0, i, ret;
1110
1111        do {
1112                if (starts_with(buf->buf, "push ")) {
1113                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
1114                        specs[nr_spec++] = xstrdup(buf->buf + 5);
1115                }
1116                else
1117                        die("http transport does not support %s", buf->buf);
1118
1119                strbuf_reset(buf);
1120                if (strbuf_getline_lf(buf, stdin) == EOF)
1121                        goto free_specs;
1122                if (!*buf->buf)
1123                        break;
1124        } while (1);
1125
1126        ret = push(nr_spec, specs);
1127        printf("\n");
1128        fflush(stdout);
1129
1130        if (ret)
1131                exit(128); /* error already reported */
1132
1133 free_specs:
1134        for (i = 0; i < nr_spec; i++)
1135                free(specs[i]);
1136        free(specs);
1137}
1138
1139/*
1140 * Used to represent the state of a connection to an HTTP server when
1141 * communicating using git's wire-protocol version 2.
1142 */
1143struct proxy_state {
1144        char *service_name;
1145        char *service_url;
1146        struct curl_slist *headers;
1147        struct strbuf request_buffer;
1148        int in;
1149        int out;
1150        struct packet_reader reader;
1151        size_t pos;
1152        int seen_flush;
1153};
1154
1155static void proxy_state_init(struct proxy_state *p, const char *service_name,
1156                             enum protocol_version version)
1157{
1158        struct strbuf buf = STRBUF_INIT;
1159
1160        memset(p, 0, sizeof(*p));
1161        p->service_name = xstrdup(service_name);
1162
1163        p->in = 0;
1164        p->out = 1;
1165        strbuf_init(&p->request_buffer, 0);
1166
1167        strbuf_addf(&buf, "%s%s", url.buf, p->service_name);
1168        p->service_url = strbuf_detach(&buf, NULL);
1169
1170        p->headers = http_copy_default_headers();
1171
1172        strbuf_addf(&buf, "Content-Type: application/x-%s-request", p->service_name);
1173        p->headers = curl_slist_append(p->headers, buf.buf);
1174        strbuf_reset(&buf);
1175
1176        strbuf_addf(&buf, "Accept: application/x-%s-result", p->service_name);
1177        p->headers = curl_slist_append(p->headers, buf.buf);
1178        strbuf_reset(&buf);
1179
1180        p->headers = curl_slist_append(p->headers, "Transfer-Encoding: chunked");
1181
1182        /* Add the Git-Protocol header */
1183        if (get_protocol_http_header(version, &buf))
1184                p->headers = curl_slist_append(p->headers, buf.buf);
1185
1186        packet_reader_init(&p->reader, p->in, NULL, 0,
1187                           PACKET_READ_GENTLE_ON_EOF |
1188                           PACKET_READ_DIE_ON_ERR_PACKET);
1189
1190        strbuf_release(&buf);
1191}
1192
1193static void proxy_state_clear(struct proxy_state *p)
1194{
1195        free(p->service_name);
1196        free(p->service_url);
1197        curl_slist_free_all(p->headers);
1198        strbuf_release(&p->request_buffer);
1199}
1200
1201/*
1202 * CURLOPT_READFUNCTION callback function.
1203 * Attempts to copy over a single packet-line at a time into the
1204 * curl provided buffer.
1205 */
1206static size_t proxy_in(char *buffer, size_t eltsize,
1207                       size_t nmemb, void *userdata)
1208{
1209        size_t max;
1210        struct proxy_state *p = userdata;
1211        size_t avail = p->request_buffer.len - p->pos;
1212
1213
1214        if (eltsize != 1)
1215                BUG("curl read callback called with size = %"PRIuMAX" != 1",
1216                    (uintmax_t)eltsize);
1217        max = nmemb;
1218
1219        if (!avail) {
1220                if (p->seen_flush) {
1221                        p->seen_flush = 0;
1222                        return 0;
1223                }
1224
1225                strbuf_reset(&p->request_buffer);
1226                switch (packet_reader_read(&p->reader)) {
1227                case PACKET_READ_EOF:
1228                        die("unexpected EOF when reading from parent process");
1229                case PACKET_READ_NORMAL:
1230                        packet_buf_write_len(&p->request_buffer, p->reader.line,
1231                                             p->reader.pktlen);
1232                        break;
1233                case PACKET_READ_DELIM:
1234                        packet_buf_delim(&p->request_buffer);
1235                        break;
1236                case PACKET_READ_FLUSH:
1237                        packet_buf_flush(&p->request_buffer);
1238                        p->seen_flush = 1;
1239                        break;
1240                }
1241                p->pos = 0;
1242                avail = p->request_buffer.len;
1243        }
1244
1245        if (max < avail)
1246                avail = max;
1247        memcpy(buffer, p->request_buffer.buf + p->pos, avail);
1248        p->pos += avail;
1249        return avail;
1250}
1251
1252static size_t proxy_out(char *buffer, size_t eltsize,
1253                        size_t nmemb, void *userdata)
1254{
1255        size_t size;
1256        struct proxy_state *p = userdata;
1257
1258        if (eltsize != 1)
1259                BUG("curl read callback called with size = %"PRIuMAX" != 1",
1260                    (uintmax_t)eltsize);
1261        size = nmemb;
1262
1263        write_or_die(p->out, buffer, size);
1264        return size;
1265}
1266
1267/* Issues a request to the HTTP server configured in `p` */
1268static int proxy_request(struct proxy_state *p)
1269{
1270        struct active_request_slot *slot;
1271
1272        slot = get_active_slot();
1273
1274        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
1275        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1276        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
1277        curl_easy_setopt(slot->curl, CURLOPT_URL, p->service_url);
1278        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, p->headers);
1279
1280        /* Setup function to read request from client */
1281        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, proxy_in);
1282        curl_easy_setopt(slot->curl, CURLOPT_READDATA, p);
1283
1284        /* Setup function to write server response to client */
1285        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, proxy_out);
1286        curl_easy_setopt(slot->curl, CURLOPT_WRITEDATA, p);
1287
1288        if (run_slot(slot, NULL) != HTTP_OK)
1289                return -1;
1290
1291        return 0;
1292}
1293
1294static int stateless_connect(const char *service_name)
1295{
1296        struct discovery *discover;
1297        struct proxy_state p;
1298
1299        /*
1300         * Run the info/refs request and see if the server supports protocol
1301         * v2.  If and only if the server supports v2 can we successfully
1302         * establish a stateless connection, otherwise we need to tell the
1303         * client to fallback to using other transport helper functions to
1304         * complete their request.
1305         */
1306        discover = discover_refs(service_name, 0);
1307        if (discover->version != protocol_v2) {
1308                printf("fallback\n");
1309                fflush(stdout);
1310                return -1;
1311        } else {
1312                /* Stateless Connection established */
1313                printf("\n");
1314                fflush(stdout);
1315        }
1316
1317        proxy_state_init(&p, service_name, discover->version);
1318
1319        /*
1320         * Dump the capability listing that we got from the server earlier
1321         * during the info/refs request.
1322         */
1323        write_or_die(p.out, discover->buf, discover->len);
1324
1325        /* Peek the next packet line.  Until we see EOF keep sending POSTs */
1326        while (packet_reader_peek(&p.reader) != PACKET_READ_EOF) {
1327                if (proxy_request(&p)) {
1328                        /* We would have an err here */
1329                        break;
1330                }
1331        }
1332
1333        proxy_state_clear(&p);
1334        return 0;
1335}
1336
1337int cmd_main(int argc, const char **argv)
1338{
1339        struct strbuf buf = STRBUF_INIT;
1340        int nongit;
1341
1342        setup_git_directory_gently(&nongit);
1343        if (argc < 2) {
1344                error("remote-curl: usage: git remote-curl <remote> [<url>]");
1345                return 1;
1346        }
1347
1348        options.verbosity = 1;
1349        options.progress = !!isatty(2);
1350        options.thin = 1;
1351        string_list_init(&options.deepen_not, 1);
1352        string_list_init(&options.push_options, 1);
1353
1354        remote = remote_get(argv[1]);
1355
1356        if (argc > 2) {
1357                end_url_with_slash(&url, argv[2]);
1358        } else {
1359                end_url_with_slash(&url, remote->url[0]);
1360        }
1361
1362        http_init(remote, url.buf, 0);
1363
1364        do {
1365                const char *arg;
1366
1367                if (strbuf_getline_lf(&buf, stdin) == EOF) {
1368                        if (ferror(stdin))
1369                                error("remote-curl: error reading command stream from git");
1370                        return 1;
1371                }
1372                if (buf.len == 0)
1373                        break;
1374                if (starts_with(buf.buf, "fetch ")) {
1375                        if (nongit)
1376                                die("remote-curl: fetch attempted without a local repo");
1377                        parse_fetch(&buf);
1378
1379                } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1380                        int for_push = !!strstr(buf.buf + 4, "for-push");
1381                        output_refs(get_refs(for_push));
1382
1383                } else if (starts_with(buf.buf, "push ")) {
1384                        parse_push(&buf);
1385
1386                } else if (skip_prefix(buf.buf, "option ", &arg)) {
1387                        char *value = strchr(arg, ' ');
1388                        int result;
1389
1390                        if (value)
1391                                *value++ = '\0';
1392                        else
1393                                value = "true";
1394
1395                        result = set_option(arg, value);
1396                        if (!result)
1397                                printf("ok\n");
1398                        else if (result < 0)
1399                                printf("error invalid value\n");
1400                        else
1401                                printf("unsupported\n");
1402                        fflush(stdout);
1403
1404                } else if (!strcmp(buf.buf, "capabilities")) {
1405                        printf("stateless-connect\n");
1406                        printf("fetch\n");
1407                        printf("option\n");
1408                        printf("push\n");
1409                        printf("check-connectivity\n");
1410                        printf("\n");
1411                        fflush(stdout);
1412                } else if (skip_prefix(buf.buf, "stateless-connect ", &arg)) {
1413                        if (!stateless_connect(arg))
1414                                break;
1415                } else {
1416                        error("remote-curl: unknown command '%s' from git", buf.buf);
1417                        return 1;
1418                }
1419                strbuf_reset(&buf);
1420        } while (1);
1421
1422        http_cleanup();
1423
1424        return 0;
1425}