Andrew's git / gitweb.git / remote-curl.c
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remote-curl.con commit Merge branch 'pw/no-editor-in-rebase-i-implicit' (69dd6e5)
   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
 385        http_ret = http_get_strbuf(refs_url.buf, &buffer, &http_options);
 386        switch (http_ret) {
 387        case HTTP_OK:
 388                break;
 389        case HTTP_MISSING_TARGET:
 390                show_http_message(&type, &charset, &buffer);
 391                die("repository '%s' not found", url.buf);
 392        case HTTP_NOAUTH:
 393                show_http_message(&type, &charset, &buffer);
 394                die("Authentication failed for '%s'", url.buf);
 395        default:
 396                show_http_message(&type, &charset, &buffer);
 397                die("unable to access '%s': %s", url.buf, curl_errorstr);
 398        }
 399
 400        if (options.verbosity && !starts_with(refs_url.buf, url.buf))
 401                warning(_("redirecting to %s"), url.buf);
 402
 403        last= xcalloc(1, sizeof(*last_discovery));
 404        last->service = xstrdup(service);
 405        last->buf_alloc = strbuf_detach(&buffer, &last->len);
 406        last->buf = last->buf_alloc;
 407
 408        strbuf_addf(&exp, "application/x-%s-advertisement", service);
 409        if (maybe_smart &&
 410            (5 <= last->len && last->buf[4] == '#') &&
 411            !strbuf_cmp(&exp, &type)) {
 412                struct packet_reader reader;
 413                packet_reader_init(&reader, -1, last->buf, last->len,
 414                                   PACKET_READ_CHOMP_NEWLINE |
 415                                   PACKET_READ_DIE_ON_ERR_PACKET);
 416
 417                /*
 418                 * smart HTTP response; validate that the service
 419                 * pkt-line matches our request.
 420                 */
 421                if (packet_reader_read(&reader) != PACKET_READ_NORMAL)
 422                        die("invalid server response; expected service, got flush packet");
 423
 424                strbuf_reset(&exp);
 425                strbuf_addf(&exp, "# service=%s", service);
 426                if (strcmp(reader.line, exp.buf))
 427                        die("invalid server response; got '%s'", reader.line);
 428                strbuf_release(&exp);
 429
 430                /* The header can include additional metadata lines, up
 431                 * until a packet flush marker.  Ignore these now, but
 432                 * in the future we might start to scan them.
 433                 */
 434                for (;;) {
 435                        packet_reader_read(&reader);
 436                        if (reader.pktlen <= 0) {
 437                                break;
 438                        }
 439                }
 440
 441                last->buf = reader.src_buffer;
 442                last->len = reader.src_len;
 443
 444                last->proto_git = 1;
 445        } else if (maybe_smart &&
 446                   last->len > 5 && starts_with(last->buf + 4, "version 2")) {
 447                last->proto_git = 1;
 448        }
 449
 450        if (last->proto_git)
 451                last->refs = parse_git_refs(last, for_push);
 452        else
 453                last->refs = parse_info_refs(last);
 454
 455        strbuf_release(&refs_url);
 456        strbuf_release(&exp);
 457        strbuf_release(&type);
 458        strbuf_release(&charset);
 459        strbuf_release(&effective_url);
 460        strbuf_release(&buffer);
 461        strbuf_release(&protocol_header);
 462        string_list_clear(&extra_headers, 0);
 463        last_discovery = last;
 464        return last;
 465}
 466
 467static struct ref *get_refs(int for_push)
 468{
 469        struct discovery *heads;
 470
 471        if (for_push)
 472                heads = discover_refs("git-receive-pack", for_push);
 473        else
 474                heads = discover_refs("git-upload-pack", for_push);
 475
 476        return heads->refs;
 477}
 478
 479static void output_refs(struct ref *refs)
 480{
 481        struct ref *posn;
 482        for (posn = refs; posn; posn = posn->next) {
 483                if (posn->symref)
 484                        printf("@%s %s\n", posn->symref, posn->name);
 485                else
 486                        printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name);
 487        }
 488        printf("\n");
 489        fflush(stdout);
 490}
 491
 492struct rpc_state {
 493        const char *service_name;
 494        const char **argv;
 495        struct strbuf *stdin_preamble;
 496        char *service_url;
 497        char *hdr_content_type;
 498        char *hdr_accept;
 499        char *protocol_header;
 500        char *buf;
 501        size_t alloc;
 502        size_t len;
 503        size_t pos;
 504        int in;
 505        int out;
 506        int any_written;
 507        struct strbuf result;
 508        unsigned gzip_request : 1;
 509        unsigned initial_buffer : 1;
 510};
 511
 512static size_t rpc_out(void *ptr, size_t eltsize,
 513                size_t nmemb, void *buffer_)
 514{
 515        size_t max = eltsize * nmemb;
 516        struct rpc_state *rpc = buffer_;
 517        size_t avail = rpc->len - rpc->pos;
 518
 519        if (!avail) {
 520                rpc->initial_buffer = 0;
 521                avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 522                if (!avail)
 523                        return 0;
 524                rpc->pos = 0;
 525                rpc->len = avail;
 526        }
 527
 528        if (max < avail)
 529                avail = max;
 530        memcpy(ptr, rpc->buf + rpc->pos, avail);
 531        rpc->pos += avail;
 532        return avail;
 533}
 534
 535#ifndef NO_CURL_IOCTL
 536static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 537{
 538        struct rpc_state *rpc = clientp;
 539
 540        switch (cmd) {
 541        case CURLIOCMD_NOP:
 542                return CURLIOE_OK;
 543
 544        case CURLIOCMD_RESTARTREAD:
 545                if (rpc->initial_buffer) {
 546                        rpc->pos = 0;
 547                        return CURLIOE_OK;
 548                }
 549                error("unable to rewind rpc post data - try increasing http.postBuffer");
 550                return CURLIOE_FAILRESTART;
 551
 552        default:
 553                return CURLIOE_UNKNOWNCMD;
 554        }
 555}
 556#endif
 557
 558struct rpc_in_data {
 559        struct rpc_state *rpc;
 560        struct active_request_slot *slot;
 561};
 562
 563/*
 564 * A callback for CURLOPT_WRITEFUNCTION. The return value is the bytes consumed
 565 * from ptr.
 566 */
 567static size_t rpc_in(char *ptr, size_t eltsize,
 568                size_t nmemb, void *buffer_)
 569{
 570        size_t size = eltsize * nmemb;
 571        struct rpc_in_data *data = buffer_;
 572        long response_code;
 573
 574        if (curl_easy_getinfo(data->slot->curl, CURLINFO_RESPONSE_CODE,
 575                              &response_code) != CURLE_OK)
 576                return size;
 577        if (response_code >= 300)
 578                return size;
 579        if (size)
 580                data->rpc->any_written = 1;
 581        write_or_die(data->rpc->in, ptr, size);
 582        return size;
 583}
 584
 585static int run_slot(struct active_request_slot *slot,
 586                    struct slot_results *results)
 587{
 588        int err;
 589        struct slot_results results_buf;
 590
 591        if (!results)
 592                results = &results_buf;
 593
 594        err = run_one_slot(slot, results);
 595
 596        if (err != HTTP_OK && err != HTTP_REAUTH) {
 597                struct strbuf msg = STRBUF_INIT;
 598                if (results->http_code && results->http_code != 200)
 599                        strbuf_addf(&msg, "HTTP %ld", results->http_code);
 600                if (results->curl_result != CURLE_OK) {
 601                        if (msg.len)
 602                                strbuf_addch(&msg, ' ');
 603                        strbuf_addf(&msg, "curl %d", results->curl_result);
 604                        if (curl_errorstr[0]) {
 605                                strbuf_addch(&msg, ' ');
 606                                strbuf_addstr(&msg, curl_errorstr);
 607                        }
 608                }
 609                error("RPC failed; %s", msg.buf);
 610                strbuf_release(&msg);
 611        }
 612
 613        return err;
 614}
 615
 616static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 617{
 618        struct active_request_slot *slot;
 619        struct curl_slist *headers = http_copy_default_headers();
 620        struct strbuf buf = STRBUF_INIT;
 621        int err;
 622
 623        slot = get_active_slot();
 624
 625        headers = curl_slist_append(headers, rpc->hdr_content_type);
 626        headers = curl_slist_append(headers, rpc->hdr_accept);
 627
 628        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 629        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 630        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 631        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 632        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 633        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 634        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 635        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 636        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 637
 638        err = run_slot(slot, results);
 639
 640        curl_slist_free_all(headers);
 641        strbuf_release(&buf);
 642        return err;
 643}
 644
 645static curl_off_t xcurl_off_t(size_t len)
 646{
 647        uintmax_t size = len;
 648        if (size > maximum_signed_value_of_type(curl_off_t))
 649                die("cannot handle pushes this big");
 650        return (curl_off_t)size;
 651}
 652
 653static int post_rpc(struct rpc_state *rpc)
 654{
 655        struct active_request_slot *slot;
 656        struct curl_slist *headers = http_copy_default_headers();
 657        int use_gzip = rpc->gzip_request;
 658        char *gzip_body = NULL;
 659        size_t gzip_size = 0;
 660        int err, large_request = 0;
 661        int needs_100_continue = 0;
 662        struct rpc_in_data rpc_in_data;
 663
 664        /* Try to load the entire request, if we can fit it into the
 665         * allocated buffer space we can use HTTP/1.0 and avoid the
 666         * chunked encoding mess.
 667         */
 668        while (1) {
 669                size_t left = rpc->alloc - rpc->len;
 670                char *buf = rpc->buf + rpc->len;
 671                int n;
 672
 673                if (left < LARGE_PACKET_MAX) {
 674                        large_request = 1;
 675                        use_gzip = 0;
 676                        break;
 677                }
 678
 679                n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 680                if (!n)
 681                        break;
 682                rpc->len += n;
 683        }
 684
 685        if (large_request) {
 686                struct slot_results results;
 687
 688                do {
 689                        err = probe_rpc(rpc, &results);
 690                        if (err == HTTP_REAUTH)
 691                                credential_fill(&http_auth);
 692                } while (err == HTTP_REAUTH);
 693                if (err != HTTP_OK)
 694                        return -1;
 695
 696                if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 697                        needs_100_continue = 1;
 698        }
 699
 700        headers = curl_slist_append(headers, rpc->hdr_content_type);
 701        headers = curl_slist_append(headers, rpc->hdr_accept);
 702        headers = curl_slist_append(headers, needs_100_continue ?
 703                "Expect: 100-continue" : "Expect:");
 704
 705        /* Add the extra Git-Protocol header */
 706        if (rpc->protocol_header)
 707                headers = curl_slist_append(headers, rpc->protocol_header);
 708
 709retry:
 710        slot = get_active_slot();
 711
 712        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 713        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 714        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 715        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 716
 717        if (large_request) {
 718                /* The request body is large and the size cannot be predicted.
 719                 * We must use chunked encoding to send it.
 720                 */
 721                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 722                rpc->initial_buffer = 1;
 723                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 724                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 725#ifndef NO_CURL_IOCTL
 726                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 727                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 728#endif
 729                if (options.verbosity > 1) {
 730                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 731                        fflush(stderr);
 732                }
 733
 734        } else if (gzip_body) {
 735                /*
 736                 * If we are looping to retry authentication, then the previous
 737                 * run will have set up the headers and gzip buffer already,
 738                 * and we just need to send it.
 739                 */
 740                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 741                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 742
 743        } else if (use_gzip && 1024 < rpc->len) {
 744                /* The client backend isn't giving us compressed data so
 745                 * we can try to deflate it ourselves, this may save on
 746                 * the transfer time.
 747                 */
 748                git_zstream stream;
 749                int ret;
 750
 751                git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 752                gzip_size = git_deflate_bound(&stream, rpc->len);
 753                gzip_body = xmalloc(gzip_size);
 754
 755                stream.next_in = (unsigned char *)rpc->buf;
 756                stream.avail_in = rpc->len;
 757                stream.next_out = (unsigned char *)gzip_body;
 758                stream.avail_out = gzip_size;
 759
 760                ret = git_deflate(&stream, Z_FINISH);
 761                if (ret != Z_STREAM_END)
 762                        die("cannot deflate request; zlib deflate error %d", ret);
 763
 764                ret = git_deflate_end_gently(&stream);
 765                if (ret != Z_OK)
 766                        die("cannot deflate request; zlib end error %d", ret);
 767
 768                gzip_size = stream.total_out;
 769
 770                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 771                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 772                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 773
 774                if (options.verbosity > 1) {
 775                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 776                                rpc->service_name,
 777                                (unsigned long)rpc->len, (unsigned long)gzip_size);
 778                        fflush(stderr);
 779                }
 780        } else {
 781                /* We know the complete request size in advance, use the
 782                 * more normal Content-Length approach.
 783                 */
 784                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 785                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(rpc->len));
 786                if (options.verbosity > 1) {
 787                        fprintf(stderr, "POST %s (%lu bytes)\n",
 788                                rpc->service_name, (unsigned long)rpc->len);
 789                        fflush(stderr);
 790                }
 791        }
 792
 793        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 794        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 795        rpc_in_data.rpc = rpc;
 796        rpc_in_data.slot = slot;
 797        curl_easy_setopt(slot->curl, CURLOPT_FILE, &rpc_in_data);
 798        curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
 799
 800
 801        rpc->any_written = 0;
 802        err = run_slot(slot, NULL);
 803        if (err == HTTP_REAUTH && !large_request) {
 804                credential_fill(&http_auth);
 805                goto retry;
 806        }
 807        if (err != HTTP_OK)
 808                err = -1;
 809
 810        if (!rpc->any_written)
 811                err = -1;
 812
 813        curl_slist_free_all(headers);
 814        free(gzip_body);
 815        return err;
 816}
 817
 818static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 819{
 820        const char *svc = rpc->service_name;
 821        struct strbuf buf = STRBUF_INIT;
 822        struct strbuf *preamble = rpc->stdin_preamble;
 823        struct child_process client = CHILD_PROCESS_INIT;
 824        int err = 0;
 825
 826        client.in = -1;
 827        client.out = -1;
 828        client.git_cmd = 1;
 829        client.argv = rpc->argv;
 830        if (start_command(&client))
 831                exit(1);
 832        if (preamble)
 833                write_or_die(client.in, preamble->buf, preamble->len);
 834        if (heads)
 835                write_or_die(client.in, heads->buf, heads->len);
 836
 837        rpc->alloc = http_post_buffer;
 838        rpc->buf = xmalloc(rpc->alloc);
 839        rpc->in = client.in;
 840        rpc->out = client.out;
 841        strbuf_init(&rpc->result, 0);
 842
 843        strbuf_addf(&buf, "%s%s", url.buf, svc);
 844        rpc->service_url = strbuf_detach(&buf, NULL);
 845
 846        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 847        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 848
 849        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 850        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 851
 852        if (get_protocol_http_header(heads->version, &buf))
 853                rpc->protocol_header = strbuf_detach(&buf, NULL);
 854        else
 855                rpc->protocol_header = NULL;
 856
 857        while (!err) {
 858                int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 859                if (!n)
 860                        break;
 861                rpc->pos = 0;
 862                rpc->len = n;
 863                err |= post_rpc(rpc);
 864        }
 865
 866        close(client.in);
 867        client.in = -1;
 868        if (!err) {
 869                strbuf_read(&rpc->result, client.out, 0);
 870        } else {
 871                char buf[4096];
 872                for (;;)
 873                        if (xread(client.out, buf, sizeof(buf)) <= 0)
 874                                break;
 875        }
 876
 877        close(client.out);
 878        client.out = -1;
 879
 880        err |= finish_command(&client);
 881        free(rpc->service_url);
 882        free(rpc->hdr_content_type);
 883        free(rpc->hdr_accept);
 884        free(rpc->protocol_header);
 885        free(rpc->buf);
 886        strbuf_release(&buf);
 887        return err;
 888}
 889
 890static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 891{
 892        struct walker *walker;
 893        char **targets;
 894        int ret, i;
 895
 896        ALLOC_ARRAY(targets, nr_heads);
 897        if (options.depth || options.deepen_since)
 898                die("dumb http transport does not support shallow capabilities");
 899        for (i = 0; i < nr_heads; i++)
 900                targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
 901
 902        walker = get_http_walker(url.buf);
 903        walker->get_verbosely = options.verbosity >= 3;
 904        walker->get_recover = 0;
 905        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 906        walker_free(walker);
 907
 908        for (i = 0; i < nr_heads; i++)
 909                free(targets[i]);
 910        free(targets);
 911
 912        return ret ? error("fetch failed.") : 0;
 913}
 914
 915static int fetch_git(struct discovery *heads,
 916        int nr_heads, struct ref **to_fetch)
 917{
 918        struct rpc_state rpc;
 919        struct strbuf preamble = STRBUF_INIT;
 920        int i, err;
 921        struct argv_array args = ARGV_ARRAY_INIT;
 922
 923        argv_array_pushl(&args, "fetch-pack", "--stateless-rpc",
 924                         "--stdin", "--lock-pack", NULL);
 925        if (options.followtags)
 926                argv_array_push(&args, "--include-tag");
 927        if (options.thin)
 928                argv_array_push(&args, "--thin");
 929        if (options.verbosity >= 3)
 930                argv_array_pushl(&args, "-v", "-v", NULL);
 931        if (options.check_self_contained_and_connected)
 932                argv_array_push(&args, "--check-self-contained-and-connected");
 933        if (options.cloning)
 934                argv_array_push(&args, "--cloning");
 935        if (options.update_shallow)
 936                argv_array_push(&args, "--update-shallow");
 937        if (!options.progress)
 938                argv_array_push(&args, "--no-progress");
 939        if (options.depth)
 940                argv_array_pushf(&args, "--depth=%lu", options.depth);
 941        if (options.deepen_since)
 942                argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since);
 943        for (i = 0; i < options.deepen_not.nr; i++)
 944                argv_array_pushf(&args, "--shallow-exclude=%s",
 945                                 options.deepen_not.items[i].string);
 946        if (options.deepen_relative && options.depth)
 947                argv_array_push(&args, "--deepen-relative");
 948        if (options.from_promisor)
 949                argv_array_push(&args, "--from-promisor");
 950        if (options.no_dependents)
 951                argv_array_push(&args, "--no-dependents");
 952        if (options.filter)
 953                argv_array_pushf(&args, "--filter=%s", options.filter);
 954        argv_array_push(&args, url.buf);
 955
 956        for (i = 0; i < nr_heads; i++) {
 957                struct ref *ref = to_fetch[i];
 958                if (!*ref->name)
 959                        die("cannot fetch by sha1 over smart http");
 960                packet_buf_write(&preamble, "%s %s\n",
 961                                 oid_to_hex(&ref->old_oid), ref->name);
 962        }
 963        packet_buf_flush(&preamble);
 964
 965        memset(&rpc, 0, sizeof(rpc));
 966        rpc.service_name = "git-upload-pack",
 967        rpc.argv = args.argv;
 968        rpc.stdin_preamble = &preamble;
 969        rpc.gzip_request = 1;
 970
 971        err = rpc_service(&rpc, heads);
 972        if (rpc.result.len)
 973                write_or_die(1, rpc.result.buf, rpc.result.len);
 974        strbuf_release(&rpc.result);
 975        strbuf_release(&preamble);
 976        argv_array_clear(&args);
 977        return err;
 978}
 979
 980static int fetch(int nr_heads, struct ref **to_fetch)
 981{
 982        struct discovery *d = discover_refs("git-upload-pack", 0);
 983        if (d->proto_git)
 984                return fetch_git(d, nr_heads, to_fetch);
 985        else
 986                return fetch_dumb(nr_heads, to_fetch);
 987}
 988
 989static void parse_fetch(struct strbuf *buf)
 990{
 991        struct ref **to_fetch = NULL;
 992        struct ref *list_head = NULL;
 993        struct ref **list = &list_head;
 994        int alloc_heads = 0, nr_heads = 0;
 995
 996        do {
 997                const char *p;
 998                if (skip_prefix(buf->buf, "fetch ", &p)) {
 999                        const char *name;
1000                        struct ref *ref;
1001                        struct object_id old_oid;
1002
1003                        if (get_oid_hex(p, &old_oid))
1004                                die("protocol error: expected sha/ref, got %s'", p);
1005                        if (p[GIT_SHA1_HEXSZ] == ' ')
1006                                name = p + GIT_SHA1_HEXSZ + 1;
1007                        else if (!p[GIT_SHA1_HEXSZ])
1008                                name = "";
1009                        else
1010                                die("protocol error: expected sha/ref, got %s'", p);
1011
1012                        ref = alloc_ref(name);
1013                        oidcpy(&ref->old_oid, &old_oid);
1014
1015                        *list = ref;
1016                        list = &ref->next;
1017
1018                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
1019                        to_fetch[nr_heads++] = ref;
1020                }
1021                else
1022                        die("http transport does not support %s", buf->buf);
1023
1024                strbuf_reset(buf);
1025                if (strbuf_getline_lf(buf, stdin) == EOF)
1026                        return;
1027                if (!*buf->buf)
1028                        break;
1029        } while (1);
1030
1031        if (fetch(nr_heads, to_fetch))
1032                exit(128); /* error already reported */
1033        free_refs(list_head);
1034        free(to_fetch);
1035
1036        printf("\n");
1037        fflush(stdout);
1038        strbuf_reset(buf);
1039}
1040
1041static int push_dav(int nr_spec, char **specs)
1042{
1043        struct child_process child = CHILD_PROCESS_INIT;
1044        size_t i;
1045
1046        child.git_cmd = 1;
1047        argv_array_push(&child.args, "http-push");
1048        argv_array_push(&child.args, "--helper-status");
1049        if (options.dry_run)
1050                argv_array_push(&child.args, "--dry-run");
1051        if (options.verbosity > 1)
1052                argv_array_push(&child.args, "--verbose");
1053        argv_array_push(&child.args, url.buf);
1054        for (i = 0; i < nr_spec; i++)
1055                argv_array_push(&child.args, specs[i]);
1056
1057        if (run_command(&child))
1058                die("git-http-push failed");
1059        return 0;
1060}
1061
1062static int push_git(struct discovery *heads, int nr_spec, char **specs)
1063{
1064        struct rpc_state rpc;
1065        int i, err;
1066        struct argv_array args;
1067        struct string_list_item *cas_option;
1068        struct strbuf preamble = STRBUF_INIT;
1069
1070        argv_array_init(&args);
1071        argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
1072                         NULL);
1073
1074        if (options.thin)
1075                argv_array_push(&args, "--thin");
1076        if (options.dry_run)
1077                argv_array_push(&args, "--dry-run");
1078        if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
1079                argv_array_push(&args, "--signed=yes");
1080        else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
1081                argv_array_push(&args, "--signed=if-asked");
1082        if (options.verbosity == 0)
1083                argv_array_push(&args, "--quiet");
1084        else if (options.verbosity > 1)
1085                argv_array_push(&args, "--verbose");
1086        for (i = 0; i < options.push_options.nr; i++)
1087                argv_array_pushf(&args, "--push-option=%s",
1088                                 options.push_options.items[i].string);
1089        argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
1090        for_each_string_list_item(cas_option, &cas_options)
1091                argv_array_push(&args, cas_option->string);
1092        argv_array_push(&args, url.buf);
1093
1094        argv_array_push(&args, "--stdin");
1095        for (i = 0; i < nr_spec; i++)
1096                packet_buf_write(&preamble, "%s\n", specs[i]);
1097        packet_buf_flush(&preamble);
1098
1099        memset(&rpc, 0, sizeof(rpc));
1100        rpc.service_name = "git-receive-pack",
1101        rpc.argv = args.argv;
1102        rpc.stdin_preamble = &preamble;
1103
1104        err = rpc_service(&rpc, heads);
1105        if (rpc.result.len)
1106                write_or_die(1, rpc.result.buf, rpc.result.len);
1107        strbuf_release(&rpc.result);
1108        strbuf_release(&preamble);
1109        argv_array_clear(&args);
1110        return err;
1111}
1112
1113static int push(int nr_spec, char **specs)
1114{
1115        struct discovery *heads = discover_refs("git-receive-pack", 1);
1116        int ret;
1117
1118        if (heads->proto_git)
1119                ret = push_git(heads, nr_spec, specs);
1120        else
1121                ret = push_dav(nr_spec, specs);
1122        free_discovery(heads);
1123        return ret;
1124}
1125
1126static void parse_push(struct strbuf *buf)
1127{
1128        char **specs = NULL;
1129        int alloc_spec = 0, nr_spec = 0, i, ret;
1130
1131        do {
1132                if (starts_with(buf->buf, "push ")) {
1133                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
1134                        specs[nr_spec++] = xstrdup(buf->buf + 5);
1135                }
1136                else
1137                        die("http transport does not support %s", buf->buf);
1138
1139                strbuf_reset(buf);
1140                if (strbuf_getline_lf(buf, stdin) == EOF)
1141                        goto free_specs;
1142                if (!*buf->buf)
1143                        break;
1144        } while (1);
1145
1146        ret = push(nr_spec, specs);
1147        printf("\n");
1148        fflush(stdout);
1149
1150        if (ret)
1151                exit(128); /* error already reported */
1152
1153 free_specs:
1154        for (i = 0; i < nr_spec; i++)
1155                free(specs[i]);
1156        free(specs);
1157}
1158
1159/*
1160 * Used to represent the state of a connection to an HTTP server when
1161 * communicating using git's wire-protocol version 2.
1162 */
1163struct proxy_state {
1164        char *service_name;
1165        char *service_url;
1166        struct curl_slist *headers;
1167        struct strbuf request_buffer;
1168        int in;
1169        int out;
1170        struct packet_reader reader;
1171        size_t pos;
1172        int seen_flush;
1173};
1174
1175static void proxy_state_init(struct proxy_state *p, const char *service_name,
1176                             enum protocol_version version)
1177{
1178        struct strbuf buf = STRBUF_INIT;
1179
1180        memset(p, 0, sizeof(*p));
1181        p->service_name = xstrdup(service_name);
1182
1183        p->in = 0;
1184        p->out = 1;
1185        strbuf_init(&p->request_buffer, 0);
1186
1187        strbuf_addf(&buf, "%s%s", url.buf, p->service_name);
1188        p->service_url = strbuf_detach(&buf, NULL);
1189
1190        p->headers = http_copy_default_headers();
1191
1192        strbuf_addf(&buf, "Content-Type: application/x-%s-request", p->service_name);
1193        p->headers = curl_slist_append(p->headers, buf.buf);
1194        strbuf_reset(&buf);
1195
1196        strbuf_addf(&buf, "Accept: application/x-%s-result", p->service_name);
1197        p->headers = curl_slist_append(p->headers, buf.buf);
1198        strbuf_reset(&buf);
1199
1200        p->headers = curl_slist_append(p->headers, "Transfer-Encoding: chunked");
1201
1202        /* Add the Git-Protocol header */
1203        if (get_protocol_http_header(version, &buf))
1204                p->headers = curl_slist_append(p->headers, buf.buf);
1205
1206        packet_reader_init(&p->reader, p->in, NULL, 0,
1207                           PACKET_READ_GENTLE_ON_EOF |
1208                           PACKET_READ_DIE_ON_ERR_PACKET);
1209
1210        strbuf_release(&buf);
1211}
1212
1213static void proxy_state_clear(struct proxy_state *p)
1214{
1215        free(p->service_name);
1216        free(p->service_url);
1217        curl_slist_free_all(p->headers);
1218        strbuf_release(&p->request_buffer);
1219}
1220
1221/*
1222 * CURLOPT_READFUNCTION callback function.
1223 * Attempts to copy over a single packet-line at a time into the
1224 * curl provided buffer.
1225 */
1226static size_t proxy_in(char *buffer, size_t eltsize,
1227                       size_t nmemb, void *userdata)
1228{
1229        size_t max;
1230        struct proxy_state *p = userdata;
1231        size_t avail = p->request_buffer.len - p->pos;
1232
1233
1234        if (eltsize != 1)
1235                BUG("curl read callback called with size = %"PRIuMAX" != 1",
1236                    (uintmax_t)eltsize);
1237        max = nmemb;
1238
1239        if (!avail) {
1240                if (p->seen_flush) {
1241                        p->seen_flush = 0;
1242                        return 0;
1243                }
1244
1245                strbuf_reset(&p->request_buffer);
1246                switch (packet_reader_read(&p->reader)) {
1247                case PACKET_READ_EOF:
1248                        die("unexpected EOF when reading from parent process");
1249                case PACKET_READ_NORMAL:
1250                        packet_buf_write_len(&p->request_buffer, p->reader.line,
1251                                             p->reader.pktlen);
1252                        break;
1253                case PACKET_READ_DELIM:
1254                        packet_buf_delim(&p->request_buffer);
1255                        break;
1256                case PACKET_READ_FLUSH:
1257                        packet_buf_flush(&p->request_buffer);
1258                        p->seen_flush = 1;
1259                        break;
1260                }
1261                p->pos = 0;
1262                avail = p->request_buffer.len;
1263        }
1264
1265        if (max < avail)
1266                avail = max;
1267        memcpy(buffer, p->request_buffer.buf + p->pos, avail);
1268        p->pos += avail;
1269        return avail;
1270}
1271
1272static size_t proxy_out(char *buffer, size_t eltsize,
1273                        size_t nmemb, void *userdata)
1274{
1275        size_t size;
1276        struct proxy_state *p = userdata;
1277
1278        if (eltsize != 1)
1279                BUG("curl read callback called with size = %"PRIuMAX" != 1",
1280                    (uintmax_t)eltsize);
1281        size = nmemb;
1282
1283        write_or_die(p->out, buffer, size);
1284        return size;
1285}
1286
1287/* Issues a request to the HTTP server configured in `p` */
1288static int proxy_request(struct proxy_state *p)
1289{
1290        struct active_request_slot *slot;
1291
1292        slot = get_active_slot();
1293
1294        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
1295        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1296        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
1297        curl_easy_setopt(slot->curl, CURLOPT_URL, p->service_url);
1298        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, p->headers);
1299
1300        /* Setup function to read request from client */
1301        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, proxy_in);
1302        curl_easy_setopt(slot->curl, CURLOPT_READDATA, p);
1303
1304        /* Setup function to write server response to client */
1305        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, proxy_out);
1306        curl_easy_setopt(slot->curl, CURLOPT_WRITEDATA, p);
1307
1308        if (run_slot(slot, NULL) != HTTP_OK)
1309                return -1;
1310
1311        return 0;
1312}
1313
1314static int stateless_connect(const char *service_name)
1315{
1316        struct discovery *discover;
1317        struct proxy_state p;
1318
1319        /*
1320         * Run the info/refs request and see if the server supports protocol
1321         * v2.  If and only if the server supports v2 can we successfully
1322         * establish a stateless connection, otherwise we need to tell the
1323         * client to fallback to using other transport helper functions to
1324         * complete their request.
1325         */
1326        discover = discover_refs(service_name, 0);
1327        if (discover->version != protocol_v2) {
1328                printf("fallback\n");
1329                fflush(stdout);
1330                return -1;
1331        } else {
1332                /* Stateless Connection established */
1333                printf("\n");
1334                fflush(stdout);
1335        }
1336
1337        proxy_state_init(&p, service_name, discover->version);
1338
1339        /*
1340         * Dump the capability listing that we got from the server earlier
1341         * during the info/refs request.
1342         */
1343        write_or_die(p.out, discover->buf, discover->len);
1344
1345        /* Peek the next packet line.  Until we see EOF keep sending POSTs */
1346        while (packet_reader_peek(&p.reader) != PACKET_READ_EOF) {
1347                if (proxy_request(&p)) {
1348                        /* We would have an err here */
1349                        break;
1350                }
1351        }
1352
1353        proxy_state_clear(&p);
1354        return 0;
1355}
1356
1357int cmd_main(int argc, const char **argv)
1358{
1359        struct strbuf buf = STRBUF_INIT;
1360        int nongit;
1361
1362        setup_git_directory_gently(&nongit);
1363        if (argc < 2) {
1364                error("remote-curl: usage: git remote-curl <remote> [<url>]");
1365                return 1;
1366        }
1367
1368        options.verbosity = 1;
1369        options.progress = !!isatty(2);
1370        options.thin = 1;
1371        string_list_init(&options.deepen_not, 1);
1372        string_list_init(&options.push_options, 1);
1373
1374        remote = remote_get(argv[1]);
1375
1376        if (argc > 2) {
1377                end_url_with_slash(&url, argv[2]);
1378        } else {
1379                end_url_with_slash(&url, remote->url[0]);
1380        }
1381
1382        http_init(remote, url.buf, 0);
1383
1384        do {
1385                const char *arg;
1386
1387                if (strbuf_getline_lf(&buf, stdin) == EOF) {
1388                        if (ferror(stdin))
1389                                error("remote-curl: error reading command stream from git");
1390                        return 1;
1391                }
1392                if (buf.len == 0)
1393                        break;
1394                if (starts_with(buf.buf, "fetch ")) {
1395                        if (nongit)
1396                                die("remote-curl: fetch attempted without a local repo");
1397                        parse_fetch(&buf);
1398
1399                } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1400                        int for_push = !!strstr(buf.buf + 4, "for-push");
1401                        output_refs(get_refs(for_push));
1402
1403                } else if (starts_with(buf.buf, "push ")) {
1404                        parse_push(&buf);
1405
1406                } else if (skip_prefix(buf.buf, "option ", &arg)) {
1407                        char *value = strchr(arg, ' ');
1408                        int result;
1409
1410                        if (value)
1411                                *value++ = '\0';
1412                        else
1413                                value = "true";
1414
1415                        result = set_option(arg, value);
1416                        if (!result)
1417                                printf("ok\n");
1418                        else if (result < 0)
1419                                printf("error invalid value\n");
1420                        else
1421                                printf("unsupported\n");
1422                        fflush(stdout);
1423
1424                } else if (!strcmp(buf.buf, "capabilities")) {
1425                        printf("stateless-connect\n");
1426                        printf("fetch\n");
1427                        printf("option\n");
1428                        printf("push\n");
1429                        printf("check-connectivity\n");
1430                        printf("\n");
1431                        fflush(stdout);
1432                } else if (skip_prefix(buf.buf, "stateless-connect ", &arg)) {
1433                        if (!stateless_connect(arg))
1434                                break;
1435                } else {
1436                        error("remote-curl: unknown command '%s' from git", buf.buf);
1437                        return 1;
1438                }
1439                strbuf_reset(&buf);
1440        } while (1);
1441
1442        http_cleanup();
1443
1444        return 0;
1445}