Andrew's git / gitweb.git / remote-curl.c
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remote-curl.con commit Merge branch 'jh/trace2' (32038fe)
   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 void check_smart_http(struct discovery *d, const char *service,
 335                             struct strbuf *type)
 336{
 337        const char *p;
 338        struct packet_reader reader;
 339
 340        /*
 341         * If we don't see x-$service-advertisement, then it's not smart-http.
 342         * But once we do, we commit to it and assume any other protocol
 343         * violations are hard errors.
 344         */
 345        if (!skip_prefix(type->buf, "application/x-", &p) ||
 346            !skip_prefix(p, service, &p) ||
 347            strcmp(p, "-advertisement"))
 348                return;
 349
 350        packet_reader_init(&reader, -1, d->buf, d->len,
 351                           PACKET_READ_CHOMP_NEWLINE |
 352                           PACKET_READ_DIE_ON_ERR_PACKET);
 353        if (packet_reader_read(&reader) != PACKET_READ_NORMAL)
 354                die("invalid server response; expected service, got flush packet");
 355
 356        if (skip_prefix(reader.line, "# service=", &p) && !strcmp(p, service)) {
 357                /*
 358                 * The header can include additional metadata lines, up
 359                 * until a packet flush marker.  Ignore these now, but
 360                 * in the future we might start to scan them.
 361                 */
 362                for (;;) {
 363                        packet_reader_read(&reader);
 364                        if (reader.pktlen <= 0) {
 365                                break;
 366                        }
 367                }
 368
 369                /*
 370                 * v0 smart http; callers expect us to soak up the
 371                 * service and header packets
 372                 */
 373                d->buf = reader.src_buffer;
 374                d->len = reader.src_len;
 375                d->proto_git = 1;
 376
 377        } else if (!strcmp(reader.line, "version 2")) {
 378                /*
 379                 * v2 smart http; do not consume version packet, which will
 380                 * be handled elsewhere.
 381                 */
 382                d->proto_git = 1;
 383
 384        } else {
 385                die("invalid server response; got '%s'", reader.line);
 386        }
 387}
 388
 389static struct discovery *discover_refs(const char *service, int for_push)
 390{
 391        struct strbuf type = STRBUF_INIT;
 392        struct strbuf charset = STRBUF_INIT;
 393        struct strbuf buffer = STRBUF_INIT;
 394        struct strbuf refs_url = STRBUF_INIT;
 395        struct strbuf effective_url = STRBUF_INIT;
 396        struct strbuf protocol_header = STRBUF_INIT;
 397        struct string_list extra_headers = STRING_LIST_INIT_DUP;
 398        struct discovery *last = last_discovery;
 399        int http_ret, maybe_smart = 0;
 400        struct http_get_options http_options;
 401        enum protocol_version version = get_protocol_version_config();
 402
 403        if (last && !strcmp(service, last->service))
 404                return last;
 405        free_discovery(last);
 406
 407        strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 408        if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 409             git_env_bool("GIT_SMART_HTTP", 1)) {
 410                maybe_smart = 1;
 411                if (!strchr(url.buf, '?'))
 412                        strbuf_addch(&refs_url, '?');
 413                else
 414                        strbuf_addch(&refs_url, '&');
 415                strbuf_addf(&refs_url, "service=%s", service);
 416        }
 417
 418        /*
 419         * NEEDSWORK: If we are trying to use protocol v2 and we are planning
 420         * to perform a push, then fallback to v0 since the client doesn't know
 421         * how to push yet using v2.
 422         */
 423        if (version == protocol_v2 && !strcmp("git-receive-pack", service))
 424                version = protocol_v0;
 425
 426        /* Add the extra Git-Protocol header */
 427        if (get_protocol_http_header(version, &protocol_header))
 428                string_list_append(&extra_headers, protocol_header.buf);
 429
 430        memset(&http_options, 0, sizeof(http_options));
 431        http_options.content_type = &type;
 432        http_options.charset = &charset;
 433        http_options.effective_url = &effective_url;
 434        http_options.base_url = &url;
 435        http_options.extra_headers = &extra_headers;
 436        http_options.initial_request = 1;
 437        http_options.no_cache = 1;
 438
 439        http_ret = http_get_strbuf(refs_url.buf, &buffer, &http_options);
 440        switch (http_ret) {
 441        case HTTP_OK:
 442                break;
 443        case HTTP_MISSING_TARGET:
 444                show_http_message(&type, &charset, &buffer);
 445                die("repository '%s' not found", url.buf);
 446        case HTTP_NOAUTH:
 447                show_http_message(&type, &charset, &buffer);
 448                die("Authentication failed for '%s'", url.buf);
 449        default:
 450                show_http_message(&type, &charset, &buffer);
 451                die("unable to access '%s': %s", url.buf, curl_errorstr);
 452        }
 453
 454        if (options.verbosity && !starts_with(refs_url.buf, url.buf))
 455                warning(_("redirecting to %s"), url.buf);
 456
 457        last= xcalloc(1, sizeof(*last_discovery));
 458        last->service = xstrdup(service);
 459        last->buf_alloc = strbuf_detach(&buffer, &last->len);
 460        last->buf = last->buf_alloc;
 461
 462        if (maybe_smart)
 463                check_smart_http(last, service, &type);
 464
 465        if (last->proto_git)
 466                last->refs = parse_git_refs(last, for_push);
 467        else
 468                last->refs = parse_info_refs(last);
 469
 470        strbuf_release(&refs_url);
 471        strbuf_release(&type);
 472        strbuf_release(&charset);
 473        strbuf_release(&effective_url);
 474        strbuf_release(&buffer);
 475        strbuf_release(&protocol_header);
 476        string_list_clear(&extra_headers, 0);
 477        last_discovery = last;
 478        return last;
 479}
 480
 481static struct ref *get_refs(int for_push)
 482{
 483        struct discovery *heads;
 484
 485        if (for_push)
 486                heads = discover_refs("git-receive-pack", for_push);
 487        else
 488                heads = discover_refs("git-upload-pack", for_push);
 489
 490        return heads->refs;
 491}
 492
 493static void output_refs(struct ref *refs)
 494{
 495        struct ref *posn;
 496        for (posn = refs; posn; posn = posn->next) {
 497                if (posn->symref)
 498                        printf("@%s %s\n", posn->symref, posn->name);
 499                else
 500                        printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name);
 501        }
 502        printf("\n");
 503        fflush(stdout);
 504}
 505
 506struct rpc_state {
 507        const char *service_name;
 508        const char **argv;
 509        struct strbuf *stdin_preamble;
 510        char *service_url;
 511        char *hdr_content_type;
 512        char *hdr_accept;
 513        char *protocol_header;
 514        char *buf;
 515        size_t alloc;
 516        size_t len;
 517        size_t pos;
 518        int in;
 519        int out;
 520        int any_written;
 521        struct strbuf result;
 522        unsigned gzip_request : 1;
 523        unsigned initial_buffer : 1;
 524};
 525
 526static size_t rpc_out(void *ptr, size_t eltsize,
 527                size_t nmemb, void *buffer_)
 528{
 529        size_t max = eltsize * nmemb;
 530        struct rpc_state *rpc = buffer_;
 531        size_t avail = rpc->len - rpc->pos;
 532
 533        if (!avail) {
 534                rpc->initial_buffer = 0;
 535                avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 536                if (!avail)
 537                        return 0;
 538                rpc->pos = 0;
 539                rpc->len = avail;
 540        }
 541
 542        if (max < avail)
 543                avail = max;
 544        memcpy(ptr, rpc->buf + rpc->pos, avail);
 545        rpc->pos += avail;
 546        return avail;
 547}
 548
 549#ifndef NO_CURL_IOCTL
 550static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 551{
 552        struct rpc_state *rpc = clientp;
 553
 554        switch (cmd) {
 555        case CURLIOCMD_NOP:
 556                return CURLIOE_OK;
 557
 558        case CURLIOCMD_RESTARTREAD:
 559                if (rpc->initial_buffer) {
 560                        rpc->pos = 0;
 561                        return CURLIOE_OK;
 562                }
 563                error("unable to rewind rpc post data - try increasing http.postBuffer");
 564                return CURLIOE_FAILRESTART;
 565
 566        default:
 567                return CURLIOE_UNKNOWNCMD;
 568        }
 569}
 570#endif
 571
 572struct rpc_in_data {
 573        struct rpc_state *rpc;
 574        struct active_request_slot *slot;
 575};
 576
 577/*
 578 * A callback for CURLOPT_WRITEFUNCTION. The return value is the bytes consumed
 579 * from ptr.
 580 */
 581static size_t rpc_in(char *ptr, size_t eltsize,
 582                size_t nmemb, void *buffer_)
 583{
 584        size_t size = eltsize * nmemb;
 585        struct rpc_in_data *data = buffer_;
 586        long response_code;
 587
 588        if (curl_easy_getinfo(data->slot->curl, CURLINFO_RESPONSE_CODE,
 589                              &response_code) != CURLE_OK)
 590                return size;
 591        if (response_code >= 300)
 592                return size;
 593        if (size)
 594                data->rpc->any_written = 1;
 595        write_or_die(data->rpc->in, ptr, size);
 596        return size;
 597}
 598
 599static int run_slot(struct active_request_slot *slot,
 600                    struct slot_results *results)
 601{
 602        int err;
 603        struct slot_results results_buf;
 604
 605        if (!results)
 606                results = &results_buf;
 607
 608        err = run_one_slot(slot, results);
 609
 610        if (err != HTTP_OK && err != HTTP_REAUTH) {
 611                struct strbuf msg = STRBUF_INIT;
 612                if (results->http_code && results->http_code != 200)
 613                        strbuf_addf(&msg, "HTTP %ld", results->http_code);
 614                if (results->curl_result != CURLE_OK) {
 615                        if (msg.len)
 616                                strbuf_addch(&msg, ' ');
 617                        strbuf_addf(&msg, "curl %d", results->curl_result);
 618                        if (curl_errorstr[0]) {
 619                                strbuf_addch(&msg, ' ');
 620                                strbuf_addstr(&msg, curl_errorstr);
 621                        }
 622                }
 623                error("RPC failed; %s", msg.buf);
 624                strbuf_release(&msg);
 625        }
 626
 627        return err;
 628}
 629
 630static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 631{
 632        struct active_request_slot *slot;
 633        struct curl_slist *headers = http_copy_default_headers();
 634        struct strbuf buf = STRBUF_INIT;
 635        int err;
 636
 637        slot = get_active_slot();
 638
 639        headers = curl_slist_append(headers, rpc->hdr_content_type);
 640        headers = curl_slist_append(headers, rpc->hdr_accept);
 641
 642        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 643        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 644        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 645        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 646        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 647        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 648        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 649        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 650        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 651
 652        err = run_slot(slot, results);
 653
 654        curl_slist_free_all(headers);
 655        strbuf_release(&buf);
 656        return err;
 657}
 658
 659static curl_off_t xcurl_off_t(size_t len)
 660{
 661        uintmax_t size = len;
 662        if (size > maximum_signed_value_of_type(curl_off_t))
 663                die("cannot handle pushes this big");
 664        return (curl_off_t)size;
 665}
 666
 667static int post_rpc(struct rpc_state *rpc)
 668{
 669        struct active_request_slot *slot;
 670        struct curl_slist *headers = http_copy_default_headers();
 671        int use_gzip = rpc->gzip_request;
 672        char *gzip_body = NULL;
 673        size_t gzip_size = 0;
 674        int err, large_request = 0;
 675        int needs_100_continue = 0;
 676        struct rpc_in_data rpc_in_data;
 677
 678        /* Try to load the entire request, if we can fit it into the
 679         * allocated buffer space we can use HTTP/1.0 and avoid the
 680         * chunked encoding mess.
 681         */
 682        while (1) {
 683                size_t left = rpc->alloc - rpc->len;
 684                char *buf = rpc->buf + rpc->len;
 685                int n;
 686
 687                if (left < LARGE_PACKET_MAX) {
 688                        large_request = 1;
 689                        use_gzip = 0;
 690                        break;
 691                }
 692
 693                n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 694                if (!n)
 695                        break;
 696                rpc->len += n;
 697        }
 698
 699        if (large_request) {
 700                struct slot_results results;
 701
 702                do {
 703                        err = probe_rpc(rpc, &results);
 704                        if (err == HTTP_REAUTH)
 705                                credential_fill(&http_auth);
 706                } while (err == HTTP_REAUTH);
 707                if (err != HTTP_OK)
 708                        return -1;
 709
 710                if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 711                        needs_100_continue = 1;
 712        }
 713
 714        headers = curl_slist_append(headers, rpc->hdr_content_type);
 715        headers = curl_slist_append(headers, rpc->hdr_accept);
 716        headers = curl_slist_append(headers, needs_100_continue ?
 717                "Expect: 100-continue" : "Expect:");
 718
 719        /* Add the extra Git-Protocol header */
 720        if (rpc->protocol_header)
 721                headers = curl_slist_append(headers, rpc->protocol_header);
 722
 723retry:
 724        slot = get_active_slot();
 725
 726        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 727        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 728        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 729        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 730
 731        if (large_request) {
 732                /* The request body is large and the size cannot be predicted.
 733                 * We must use chunked encoding to send it.
 734                 */
 735                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 736                rpc->initial_buffer = 1;
 737                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 738                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 739#ifndef NO_CURL_IOCTL
 740                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 741                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 742#endif
 743                if (options.verbosity > 1) {
 744                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 745                        fflush(stderr);
 746                }
 747
 748        } else if (gzip_body) {
 749                /*
 750                 * If we are looping to retry authentication, then the previous
 751                 * run will have set up the headers and gzip buffer already,
 752                 * and we just need to send it.
 753                 */
 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        } else if (use_gzip && 1024 < rpc->len) {
 758                /* The client backend isn't giving us compressed data so
 759                 * we can try to deflate it ourselves, this may save on
 760                 * the transfer time.
 761                 */
 762                git_zstream stream;
 763                int ret;
 764
 765                git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 766                gzip_size = git_deflate_bound(&stream, rpc->len);
 767                gzip_body = xmalloc(gzip_size);
 768
 769                stream.next_in = (unsigned char *)rpc->buf;
 770                stream.avail_in = rpc->len;
 771                stream.next_out = (unsigned char *)gzip_body;
 772                stream.avail_out = gzip_size;
 773
 774                ret = git_deflate(&stream, Z_FINISH);
 775                if (ret != Z_STREAM_END)
 776                        die("cannot deflate request; zlib deflate error %d", ret);
 777
 778                ret = git_deflate_end_gently(&stream);
 779                if (ret != Z_OK)
 780                        die("cannot deflate request; zlib end error %d", ret);
 781
 782                gzip_size = stream.total_out;
 783
 784                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 785                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 786                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 787
 788                if (options.verbosity > 1) {
 789                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 790                                rpc->service_name,
 791                                (unsigned long)rpc->len, (unsigned long)gzip_size);
 792                        fflush(stderr);
 793                }
 794        } else {
 795                /* We know the complete request size in advance, use the
 796                 * more normal Content-Length approach.
 797                 */
 798                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 799                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(rpc->len));
 800                if (options.verbosity > 1) {
 801                        fprintf(stderr, "POST %s (%lu bytes)\n",
 802                                rpc->service_name, (unsigned long)rpc->len);
 803                        fflush(stderr);
 804                }
 805        }
 806
 807        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 808        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 809        rpc_in_data.rpc = rpc;
 810        rpc_in_data.slot = slot;
 811        curl_easy_setopt(slot->curl, CURLOPT_FILE, &rpc_in_data);
 812        curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
 813
 814
 815        rpc->any_written = 0;
 816        err = run_slot(slot, NULL);
 817        if (err == HTTP_REAUTH && !large_request) {
 818                credential_fill(&http_auth);
 819                goto retry;
 820        }
 821        if (err != HTTP_OK)
 822                err = -1;
 823
 824        if (!rpc->any_written)
 825                err = -1;
 826
 827        curl_slist_free_all(headers);
 828        free(gzip_body);
 829        return err;
 830}
 831
 832static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 833{
 834        const char *svc = rpc->service_name;
 835        struct strbuf buf = STRBUF_INIT;
 836        struct strbuf *preamble = rpc->stdin_preamble;
 837        struct child_process client = CHILD_PROCESS_INIT;
 838        int err = 0;
 839
 840        client.in = -1;
 841        client.out = -1;
 842        client.git_cmd = 1;
 843        client.argv = rpc->argv;
 844        if (start_command(&client))
 845                exit(1);
 846        if (preamble)
 847                write_or_die(client.in, preamble->buf, preamble->len);
 848        if (heads)
 849                write_or_die(client.in, heads->buf, heads->len);
 850
 851        rpc->alloc = http_post_buffer;
 852        rpc->buf = xmalloc(rpc->alloc);
 853        rpc->in = client.in;
 854        rpc->out = client.out;
 855        strbuf_init(&rpc->result, 0);
 856
 857        strbuf_addf(&buf, "%s%s", url.buf, svc);
 858        rpc->service_url = strbuf_detach(&buf, NULL);
 859
 860        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 861        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 862
 863        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 864        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 865
 866        if (get_protocol_http_header(heads->version, &buf))
 867                rpc->protocol_header = strbuf_detach(&buf, NULL);
 868        else
 869                rpc->protocol_header = NULL;
 870
 871        while (!err) {
 872                int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 873                if (!n)
 874                        break;
 875                rpc->pos = 0;
 876                rpc->len = n;
 877                err |= post_rpc(rpc);
 878        }
 879
 880        close(client.in);
 881        client.in = -1;
 882        if (!err) {
 883                strbuf_read(&rpc->result, client.out, 0);
 884        } else {
 885                char buf[4096];
 886                for (;;)
 887                        if (xread(client.out, buf, sizeof(buf)) <= 0)
 888                                break;
 889        }
 890
 891        close(client.out);
 892        client.out = -1;
 893
 894        err |= finish_command(&client);
 895        free(rpc->service_url);
 896        free(rpc->hdr_content_type);
 897        free(rpc->hdr_accept);
 898        free(rpc->protocol_header);
 899        free(rpc->buf);
 900        strbuf_release(&buf);
 901        return err;
 902}
 903
 904static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 905{
 906        struct walker *walker;
 907        char **targets;
 908        int ret, i;
 909
 910        ALLOC_ARRAY(targets, nr_heads);
 911        if (options.depth || options.deepen_since)
 912                die("dumb http transport does not support shallow capabilities");
 913        for (i = 0; i < nr_heads; i++)
 914                targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
 915
 916        walker = get_http_walker(url.buf);
 917        walker->get_verbosely = options.verbosity >= 3;
 918        walker->get_recover = 0;
 919        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 920        walker_free(walker);
 921
 922        for (i = 0; i < nr_heads; i++)
 923                free(targets[i]);
 924        free(targets);
 925
 926        return ret ? error("fetch failed.") : 0;
 927}
 928
 929static int fetch_git(struct discovery *heads,
 930        int nr_heads, struct ref **to_fetch)
 931{
 932        struct rpc_state rpc;
 933        struct strbuf preamble = STRBUF_INIT;
 934        int i, err;
 935        struct argv_array args = ARGV_ARRAY_INIT;
 936
 937        argv_array_pushl(&args, "fetch-pack", "--stateless-rpc",
 938                         "--stdin", "--lock-pack", NULL);
 939        if (options.followtags)
 940                argv_array_push(&args, "--include-tag");
 941        if (options.thin)
 942                argv_array_push(&args, "--thin");
 943        if (options.verbosity >= 3)
 944                argv_array_pushl(&args, "-v", "-v", NULL);
 945        if (options.check_self_contained_and_connected)
 946                argv_array_push(&args, "--check-self-contained-and-connected");
 947        if (options.cloning)
 948                argv_array_push(&args, "--cloning");
 949        if (options.update_shallow)
 950                argv_array_push(&args, "--update-shallow");
 951        if (!options.progress)
 952                argv_array_push(&args, "--no-progress");
 953        if (options.depth)
 954                argv_array_pushf(&args, "--depth=%lu", options.depth);
 955        if (options.deepen_since)
 956                argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since);
 957        for (i = 0; i < options.deepen_not.nr; i++)
 958                argv_array_pushf(&args, "--shallow-exclude=%s",
 959                                 options.deepen_not.items[i].string);
 960        if (options.deepen_relative && options.depth)
 961                argv_array_push(&args, "--deepen-relative");
 962        if (options.from_promisor)
 963                argv_array_push(&args, "--from-promisor");
 964        if (options.no_dependents)
 965                argv_array_push(&args, "--no-dependents");
 966        if (options.filter)
 967                argv_array_pushf(&args, "--filter=%s", options.filter);
 968        argv_array_push(&args, url.buf);
 969
 970        for (i = 0; i < nr_heads; i++) {
 971                struct ref *ref = to_fetch[i];
 972                if (!*ref->name)
 973                        die("cannot fetch by sha1 over smart http");
 974                packet_buf_write(&preamble, "%s %s\n",
 975                                 oid_to_hex(&ref->old_oid), ref->name);
 976        }
 977        packet_buf_flush(&preamble);
 978
 979        memset(&rpc, 0, sizeof(rpc));
 980        rpc.service_name = "git-upload-pack",
 981        rpc.argv = args.argv;
 982        rpc.stdin_preamble = &preamble;
 983        rpc.gzip_request = 1;
 984
 985        err = rpc_service(&rpc, heads);
 986        if (rpc.result.len)
 987                write_or_die(1, rpc.result.buf, rpc.result.len);
 988        strbuf_release(&rpc.result);
 989        strbuf_release(&preamble);
 990        argv_array_clear(&args);
 991        return err;
 992}
 993
 994static int fetch(int nr_heads, struct ref **to_fetch)
 995{
 996        struct discovery *d = discover_refs("git-upload-pack", 0);
 997        if (d->proto_git)
 998                return fetch_git(d, nr_heads, to_fetch);
 999        else
1000                return fetch_dumb(nr_heads, to_fetch);
1001}
1002
1003static void parse_fetch(struct strbuf *buf)
1004{
1005        struct ref **to_fetch = NULL;
1006        struct ref *list_head = NULL;
1007        struct ref **list = &list_head;
1008        int alloc_heads = 0, nr_heads = 0;
1009
1010        do {
1011                const char *p;
1012                if (skip_prefix(buf->buf, "fetch ", &p)) {
1013                        const char *name;
1014                        struct ref *ref;
1015                        struct object_id old_oid;
1016
1017                        if (get_oid_hex(p, &old_oid))
1018                                die("protocol error: expected sha/ref, got %s'", p);
1019                        if (p[GIT_SHA1_HEXSZ] == ' ')
1020                                name = p + GIT_SHA1_HEXSZ + 1;
1021                        else if (!p[GIT_SHA1_HEXSZ])
1022                                name = "";
1023                        else
1024                                die("protocol error: expected sha/ref, got %s'", p);
1025
1026                        ref = alloc_ref(name);
1027                        oidcpy(&ref->old_oid, &old_oid);
1028
1029                        *list = ref;
1030                        list = &ref->next;
1031
1032                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
1033                        to_fetch[nr_heads++] = ref;
1034                }
1035                else
1036                        die("http transport does not support %s", buf->buf);
1037
1038                strbuf_reset(buf);
1039                if (strbuf_getline_lf(buf, stdin) == EOF)
1040                        return;
1041                if (!*buf->buf)
1042                        break;
1043        } while (1);
1044
1045        if (fetch(nr_heads, to_fetch))
1046                exit(128); /* error already reported */
1047        free_refs(list_head);
1048        free(to_fetch);
1049
1050        printf("\n");
1051        fflush(stdout);
1052        strbuf_reset(buf);
1053}
1054
1055static int push_dav(int nr_spec, char **specs)
1056{
1057        struct child_process child = CHILD_PROCESS_INIT;
1058        size_t i;
1059
1060        child.git_cmd = 1;
1061        argv_array_push(&child.args, "http-push");
1062        argv_array_push(&child.args, "--helper-status");
1063        if (options.dry_run)
1064                argv_array_push(&child.args, "--dry-run");
1065        if (options.verbosity > 1)
1066                argv_array_push(&child.args, "--verbose");
1067        argv_array_push(&child.args, url.buf);
1068        for (i = 0; i < nr_spec; i++)
1069                argv_array_push(&child.args, specs[i]);
1070
1071        if (run_command(&child))
1072                die("git-http-push failed");
1073        return 0;
1074}
1075
1076static int push_git(struct discovery *heads, int nr_spec, char **specs)
1077{
1078        struct rpc_state rpc;
1079        int i, err;
1080        struct argv_array args;
1081        struct string_list_item *cas_option;
1082        struct strbuf preamble = STRBUF_INIT;
1083
1084        argv_array_init(&args);
1085        argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
1086                         NULL);
1087
1088        if (options.thin)
1089                argv_array_push(&args, "--thin");
1090        if (options.dry_run)
1091                argv_array_push(&args, "--dry-run");
1092        if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
1093                argv_array_push(&args, "--signed=yes");
1094        else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
1095                argv_array_push(&args, "--signed=if-asked");
1096        if (options.verbosity == 0)
1097                argv_array_push(&args, "--quiet");
1098        else if (options.verbosity > 1)
1099                argv_array_push(&args, "--verbose");
1100        for (i = 0; i < options.push_options.nr; i++)
1101                argv_array_pushf(&args, "--push-option=%s",
1102                                 options.push_options.items[i].string);
1103        argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
1104        for_each_string_list_item(cas_option, &cas_options)
1105                argv_array_push(&args, cas_option->string);
1106        argv_array_push(&args, url.buf);
1107
1108        argv_array_push(&args, "--stdin");
1109        for (i = 0; i < nr_spec; i++)
1110                packet_buf_write(&preamble, "%s\n", specs[i]);
1111        packet_buf_flush(&preamble);
1112
1113        memset(&rpc, 0, sizeof(rpc));
1114        rpc.service_name = "git-receive-pack",
1115        rpc.argv = args.argv;
1116        rpc.stdin_preamble = &preamble;
1117
1118        err = rpc_service(&rpc, heads);
1119        if (rpc.result.len)
1120                write_or_die(1, rpc.result.buf, rpc.result.len);
1121        strbuf_release(&rpc.result);
1122        strbuf_release(&preamble);
1123        argv_array_clear(&args);
1124        return err;
1125}
1126
1127static int push(int nr_spec, char **specs)
1128{
1129        struct discovery *heads = discover_refs("git-receive-pack", 1);
1130        int ret;
1131
1132        if (heads->proto_git)
1133                ret = push_git(heads, nr_spec, specs);
1134        else
1135                ret = push_dav(nr_spec, specs);
1136        free_discovery(heads);
1137        return ret;
1138}
1139
1140static void parse_push(struct strbuf *buf)
1141{
1142        char **specs = NULL;
1143        int alloc_spec = 0, nr_spec = 0, i, ret;
1144
1145        do {
1146                if (starts_with(buf->buf, "push ")) {
1147                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
1148                        specs[nr_spec++] = xstrdup(buf->buf + 5);
1149                }
1150                else
1151                        die("http transport does not support %s", buf->buf);
1152
1153                strbuf_reset(buf);
1154                if (strbuf_getline_lf(buf, stdin) == EOF)
1155                        goto free_specs;
1156                if (!*buf->buf)
1157                        break;
1158        } while (1);
1159
1160        ret = push(nr_spec, specs);
1161        printf("\n");
1162        fflush(stdout);
1163
1164        if (ret)
1165                exit(128); /* error already reported */
1166
1167 free_specs:
1168        for (i = 0; i < nr_spec; i++)
1169                free(specs[i]);
1170        free(specs);
1171}
1172
1173/*
1174 * Used to represent the state of a connection to an HTTP server when
1175 * communicating using git's wire-protocol version 2.
1176 */
1177struct proxy_state {
1178        char *service_name;
1179        char *service_url;
1180        struct curl_slist *headers;
1181        struct strbuf request_buffer;
1182        int in;
1183        int out;
1184        struct packet_reader reader;
1185        size_t pos;
1186        int seen_flush;
1187};
1188
1189static void proxy_state_init(struct proxy_state *p, const char *service_name,
1190                             enum protocol_version version)
1191{
1192        struct strbuf buf = STRBUF_INIT;
1193
1194        memset(p, 0, sizeof(*p));
1195        p->service_name = xstrdup(service_name);
1196
1197        p->in = 0;
1198        p->out = 1;
1199        strbuf_init(&p->request_buffer, 0);
1200
1201        strbuf_addf(&buf, "%s%s", url.buf, p->service_name);
1202        p->service_url = strbuf_detach(&buf, NULL);
1203
1204        p->headers = http_copy_default_headers();
1205
1206        strbuf_addf(&buf, "Content-Type: application/x-%s-request", p->service_name);
1207        p->headers = curl_slist_append(p->headers, buf.buf);
1208        strbuf_reset(&buf);
1209
1210        strbuf_addf(&buf, "Accept: application/x-%s-result", p->service_name);
1211        p->headers = curl_slist_append(p->headers, buf.buf);
1212        strbuf_reset(&buf);
1213
1214        p->headers = curl_slist_append(p->headers, "Transfer-Encoding: chunked");
1215
1216        /* Add the Git-Protocol header */
1217        if (get_protocol_http_header(version, &buf))
1218                p->headers = curl_slist_append(p->headers, buf.buf);
1219
1220        packet_reader_init(&p->reader, p->in, NULL, 0,
1221                           PACKET_READ_GENTLE_ON_EOF |
1222                           PACKET_READ_DIE_ON_ERR_PACKET);
1223
1224        strbuf_release(&buf);
1225}
1226
1227static void proxy_state_clear(struct proxy_state *p)
1228{
1229        free(p->service_name);
1230        free(p->service_url);
1231        curl_slist_free_all(p->headers);
1232        strbuf_release(&p->request_buffer);
1233}
1234
1235/*
1236 * CURLOPT_READFUNCTION callback function.
1237 * Attempts to copy over a single packet-line at a time into the
1238 * curl provided buffer.
1239 */
1240static size_t proxy_in(char *buffer, size_t eltsize,
1241                       size_t nmemb, void *userdata)
1242{
1243        size_t max;
1244        struct proxy_state *p = userdata;
1245        size_t avail = p->request_buffer.len - p->pos;
1246
1247
1248        if (eltsize != 1)
1249                BUG("curl read callback called with size = %"PRIuMAX" != 1",
1250                    (uintmax_t)eltsize);
1251        max = nmemb;
1252
1253        if (!avail) {
1254                if (p->seen_flush) {
1255                        p->seen_flush = 0;
1256                        return 0;
1257                }
1258
1259                strbuf_reset(&p->request_buffer);
1260                switch (packet_reader_read(&p->reader)) {
1261                case PACKET_READ_EOF:
1262                        die("unexpected EOF when reading from parent process");
1263                case PACKET_READ_NORMAL:
1264                        packet_buf_write_len(&p->request_buffer, p->reader.line,
1265                                             p->reader.pktlen);
1266                        break;
1267                case PACKET_READ_DELIM:
1268                        packet_buf_delim(&p->request_buffer);
1269                        break;
1270                case PACKET_READ_FLUSH:
1271                        packet_buf_flush(&p->request_buffer);
1272                        p->seen_flush = 1;
1273                        break;
1274                }
1275                p->pos = 0;
1276                avail = p->request_buffer.len;
1277        }
1278
1279        if (max < avail)
1280                avail = max;
1281        memcpy(buffer, p->request_buffer.buf + p->pos, avail);
1282        p->pos += avail;
1283        return avail;
1284}
1285
1286static size_t proxy_out(char *buffer, size_t eltsize,
1287                        size_t nmemb, void *userdata)
1288{
1289        size_t size;
1290        struct proxy_state *p = userdata;
1291
1292        if (eltsize != 1)
1293                BUG("curl read callback called with size = %"PRIuMAX" != 1",
1294                    (uintmax_t)eltsize);
1295        size = nmemb;
1296
1297        write_or_die(p->out, buffer, size);
1298        return size;
1299}
1300
1301/* Issues a request to the HTTP server configured in `p` */
1302static int proxy_request(struct proxy_state *p)
1303{
1304        struct active_request_slot *slot;
1305
1306        slot = get_active_slot();
1307
1308        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
1309        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1310        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
1311        curl_easy_setopt(slot->curl, CURLOPT_URL, p->service_url);
1312        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, p->headers);
1313
1314        /* Setup function to read request from client */
1315        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, proxy_in);
1316        curl_easy_setopt(slot->curl, CURLOPT_READDATA, p);
1317
1318        /* Setup function to write server response to client */
1319        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, proxy_out);
1320        curl_easy_setopt(slot->curl, CURLOPT_WRITEDATA, p);
1321
1322        if (run_slot(slot, NULL) != HTTP_OK)
1323                return -1;
1324
1325        return 0;
1326}
1327
1328static int stateless_connect(const char *service_name)
1329{
1330        struct discovery *discover;
1331        struct proxy_state p;
1332
1333        /*
1334         * Run the info/refs request and see if the server supports protocol
1335         * v2.  If and only if the server supports v2 can we successfully
1336         * establish a stateless connection, otherwise we need to tell the
1337         * client to fallback to using other transport helper functions to
1338         * complete their request.
1339         */
1340        discover = discover_refs(service_name, 0);
1341        if (discover->version != protocol_v2) {
1342                printf("fallback\n");
1343                fflush(stdout);
1344                return -1;
1345        } else {
1346                /* Stateless Connection established */
1347                printf("\n");
1348                fflush(stdout);
1349        }
1350
1351        proxy_state_init(&p, service_name, discover->version);
1352
1353        /*
1354         * Dump the capability listing that we got from the server earlier
1355         * during the info/refs request.
1356         */
1357        write_or_die(p.out, discover->buf, discover->len);
1358
1359        /* Peek the next packet line.  Until we see EOF keep sending POSTs */
1360        while (packet_reader_peek(&p.reader) != PACKET_READ_EOF) {
1361                if (proxy_request(&p)) {
1362                        /* We would have an err here */
1363                        break;
1364                }
1365        }
1366
1367        proxy_state_clear(&p);
1368        return 0;
1369}
1370
1371int cmd_main(int argc, const char **argv)
1372{
1373        struct strbuf buf = STRBUF_INIT;
1374        int nongit;
1375
1376        setup_git_directory_gently(&nongit);
1377        if (argc < 2) {
1378                error("remote-curl: usage: git remote-curl <remote> [<url>]");
1379                return 1;
1380        }
1381
1382        options.verbosity = 1;
1383        options.progress = !!isatty(2);
1384        options.thin = 1;
1385        string_list_init(&options.deepen_not, 1);
1386        string_list_init(&options.push_options, 1);
1387
1388        /*
1389         * Just report "remote-curl" here (folding all the various aliases
1390         * ("git-remote-http", "git-remote-https", and etc.) here since they
1391         * are all just copies of the same actual executable.
1392         */
1393        trace2_cmd_name("remote-curl");
1394
1395        remote = remote_get(argv[1]);
1396
1397        if (argc > 2) {
1398                end_url_with_slash(&url, argv[2]);
1399        } else {
1400                end_url_with_slash(&url, remote->url[0]);
1401        }
1402
1403        http_init(remote, url.buf, 0);
1404
1405        do {
1406                const char *arg;
1407
1408                if (strbuf_getline_lf(&buf, stdin) == EOF) {
1409                        if (ferror(stdin))
1410                                error("remote-curl: error reading command stream from git");
1411                        return 1;
1412                }
1413                if (buf.len == 0)
1414                        break;
1415                if (starts_with(buf.buf, "fetch ")) {
1416                        if (nongit)
1417                                die("remote-curl: fetch attempted without a local repo");
1418                        parse_fetch(&buf);
1419
1420                } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1421                        int for_push = !!strstr(buf.buf + 4, "for-push");
1422                        output_refs(get_refs(for_push));
1423
1424                } else if (starts_with(buf.buf, "push ")) {
1425                        parse_push(&buf);
1426
1427                } else if (skip_prefix(buf.buf, "option ", &arg)) {
1428                        char *value = strchr(arg, ' ');
1429                        int result;
1430
1431                        if (value)
1432                                *value++ = '\0';
1433                        else
1434                                value = "true";
1435
1436                        result = set_option(arg, value);
1437                        if (!result)
1438                                printf("ok\n");
1439                        else if (result < 0)
1440                                printf("error invalid value\n");
1441                        else
1442                                printf("unsupported\n");
1443                        fflush(stdout);
1444
1445                } else if (!strcmp(buf.buf, "capabilities")) {
1446                        printf("stateless-connect\n");
1447                        printf("fetch\n");
1448                        printf("option\n");
1449                        printf("push\n");
1450                        printf("check-connectivity\n");
1451                        printf("\n");
1452                        fflush(stdout);
1453                } else if (skip_prefix(buf.buf, "stateless-connect ", &arg)) {
1454                        if (!stateless_connect(arg))
1455                                break;
1456                } else {
1457                        error("remote-curl: unknown command '%s' from git", buf.buf);
1458                        return 1;
1459                }
1460                strbuf_reset(&buf);
1461        } while (1);
1462
1463        http_cleanup();
1464
1465        return 0;
1466}