Andrew's git / gitweb.git / remote-curl.c
?
remote-curl.con commit *.[ch]: manually align parameter lists (ad6dad0)
   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#include "transport.h"
  20
  21static struct remote *remote;
  22/* always ends with a trailing slash */
  23static struct strbuf url = STRBUF_INIT;
  24
  25struct options {
  26        int verbosity;
  27        unsigned long depth;
  28        char *deepen_since;
  29        struct string_list deepen_not;
  30        struct string_list push_options;
  31        char *filter;
  32        unsigned progress : 1,
  33                check_self_contained_and_connected : 1,
  34                cloning : 1,
  35                update_shallow : 1,
  36                followtags : 1,
  37                dry_run : 1,
  38                thin : 1,
  39                /* One of the SEND_PACK_PUSH_CERT_* constants. */
  40                push_cert : 2,
  41                deepen_relative : 1,
  42                from_promisor : 1,
  43                no_dependents : 1;
  44};
  45static struct options options;
  46static struct string_list cas_options = STRING_LIST_INIT_DUP;
  47
  48static int set_option(const char *name, const char *value)
  49{
  50        if (!strcmp(name, "verbosity")) {
  51                char *end;
  52                int v = strtol(value, &end, 10);
  53                if (value == end || *end)
  54                        return -1;
  55                options.verbosity = v;
  56                return 0;
  57        }
  58        else if (!strcmp(name, "progress")) {
  59                if (!strcmp(value, "true"))
  60                        options.progress = 1;
  61                else if (!strcmp(value, "false"))
  62                        options.progress = 0;
  63                else
  64                        return -1;
  65                return 0;
  66        }
  67        else if (!strcmp(name, "depth")) {
  68                char *end;
  69                unsigned long v = strtoul(value, &end, 10);
  70                if (value == end || *end)
  71                        return -1;
  72                options.depth = v;
  73                return 0;
  74        }
  75        else if (!strcmp(name, "deepen-since")) {
  76                options.deepen_since = xstrdup(value);
  77                return 0;
  78        }
  79        else if (!strcmp(name, "deepen-not")) {
  80                string_list_append(&options.deepen_not, value);
  81                return 0;
  82        }
  83        else if (!strcmp(name, "deepen-relative")) {
  84                if (!strcmp(value, "true"))
  85                        options.deepen_relative = 1;
  86                else if (!strcmp(value, "false"))
  87                        options.deepen_relative = 0;
  88                else
  89                        return -1;
  90                return 0;
  91        }
  92        else if (!strcmp(name, "followtags")) {
  93                if (!strcmp(value, "true"))
  94                        options.followtags = 1;
  95                else if (!strcmp(value, "false"))
  96                        options.followtags = 0;
  97                else
  98                        return -1;
  99                return 0;
 100        }
 101        else if (!strcmp(name, "dry-run")) {
 102                if (!strcmp(value, "true"))
 103                        options.dry_run = 1;
 104                else if (!strcmp(value, "false"))
 105                        options.dry_run = 0;
 106                else
 107                        return -1;
 108                return 0;
 109        }
 110        else if (!strcmp(name, "check-connectivity")) {
 111                if (!strcmp(value, "true"))
 112                        options.check_self_contained_and_connected = 1;
 113                else if (!strcmp(value, "false"))
 114                        options.check_self_contained_and_connected = 0;
 115                else
 116                        return -1;
 117                return 0;
 118        }
 119        else if (!strcmp(name, "cas")) {
 120                struct strbuf val = STRBUF_INIT;
 121                strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
 122                string_list_append(&cas_options, val.buf);
 123                strbuf_release(&val);
 124                return 0;
 125        } else if (!strcmp(name, "cloning")) {
 126                if (!strcmp(value, "true"))
 127                        options.cloning = 1;
 128                else if (!strcmp(value, "false"))
 129                        options.cloning = 0;
 130                else
 131                        return -1;
 132                return 0;
 133        } else if (!strcmp(name, "update-shallow")) {
 134                if (!strcmp(value, "true"))
 135                        options.update_shallow = 1;
 136                else if (!strcmp(value, "false"))
 137                        options.update_shallow = 0;
 138                else
 139                        return -1;
 140                return 0;
 141        } else if (!strcmp(name, "pushcert")) {
 142                if (!strcmp(value, "true"))
 143                        options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 144                else if (!strcmp(value, "false"))
 145                        options.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 146                else if (!strcmp(value, "if-asked"))
 147                        options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 148                else
 149                        return -1;
 150                return 0;
 151        } else if (!strcmp(name, "push-option")) {
 152                if (*value != '"')
 153                        string_list_append(&options.push_options, value);
 154                else {
 155                        struct strbuf unquoted = STRBUF_INIT;
 156                        if (unquote_c_style(&unquoted, value, NULL) < 0)
 157                                die(_("invalid quoting in push-option value: '%s'"), value);
 158                        string_list_append_nodup(&options.push_options,
 159                                                 strbuf_detach(&unquoted, NULL));
 160                }
 161                return 0;
 162
 163#if LIBCURL_VERSION_NUM >= 0x070a08
 164        } else if (!strcmp(name, "family")) {
 165                if (!strcmp(value, "ipv4"))
 166                        git_curl_ipresolve = CURL_IPRESOLVE_V4;
 167                else if (!strcmp(value, "ipv6"))
 168                        git_curl_ipresolve = CURL_IPRESOLVE_V6;
 169                else if (!strcmp(value, "all"))
 170                        git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
 171                else
 172                        return -1;
 173                return 0;
 174#endif /* LIBCURL_VERSION_NUM >= 0x070a08 */
 175        } else if (!strcmp(name, "from-promisor")) {
 176                options.from_promisor = 1;
 177                return 0;
 178        } else if (!strcmp(name, "no-dependents")) {
 179                options.no_dependents = 1;
 180                return 0;
 181        } else if (!strcmp(name, "filter")) {
 182                options.filter = xstrdup(value);
 183                return 0;
 184        } else {
 185                return 1 /* unsupported */;
 186        }
 187}
 188
 189struct discovery {
 190        char *service;
 191        char *buf_alloc;
 192        char *buf;
 193        size_t len;
 194        struct ref *refs;
 195        struct oid_array shallow;
 196        enum protocol_version version;
 197        unsigned proto_git : 1;
 198};
 199static struct discovery *last_discovery;
 200
 201static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 202{
 203        struct ref *list = NULL;
 204        struct packet_reader reader;
 205
 206        packet_reader_init(&reader, -1, heads->buf, heads->len,
 207                           PACKET_READ_CHOMP_NEWLINE |
 208                           PACKET_READ_GENTLE_ON_EOF |
 209                           PACKET_READ_DIE_ON_ERR_PACKET);
 210
 211        heads->version = discover_version(&reader);
 212        switch (heads->version) {
 213        case protocol_v2:
 214                /*
 215                 * Do nothing.  This isn't a list of refs but rather a
 216                 * capability advertisement.  Client would have run
 217                 * 'stateless-connect' so we'll dump this capability listing
 218                 * and let them request the refs themselves.
 219                 */
 220                break;
 221        case protocol_v1:
 222        case protocol_v0:
 223                get_remote_heads(&reader, &list, for_push ? REF_NORMAL : 0,
 224                                 NULL, &heads->shallow);
 225                break;
 226        case protocol_unknown_version:
 227                BUG("unknown protocol version");
 228        }
 229
 230        return list;
 231}
 232
 233static struct ref *parse_info_refs(struct discovery *heads)
 234{
 235        char *data, *start, *mid;
 236        char *ref_name;
 237        int i = 0;
 238
 239        struct ref *refs = NULL;
 240        struct ref *ref = NULL;
 241        struct ref *last_ref = NULL;
 242
 243        data = heads->buf;
 244        start = NULL;
 245        mid = data;
 246        while (i < heads->len) {
 247                if (!start) {
 248                        start = &data[i];
 249                }
 250                if (data[i] == '\t')
 251                        mid = &data[i];
 252                if (data[i] == '\n') {
 253                        if (mid - start != 40)
 254                                die(_("%sinfo/refs not valid: is this a git repository?"),
 255                                    transport_anonymize_url(url.buf));
 256                        data[i] = 0;
 257                        ref_name = mid + 1;
 258                        ref = alloc_ref(ref_name);
 259                        get_oid_hex(start, &ref->old_oid);
 260                        if (!refs)
 261                                refs = ref;
 262                        if (last_ref)
 263                                last_ref->next = ref;
 264                        last_ref = ref;
 265                        start = NULL;
 266                }
 267                i++;
 268        }
 269
 270        ref = alloc_ref("HEAD");
 271        if (!http_fetch_ref(url.buf, ref) &&
 272            !resolve_remote_symref(ref, refs)) {
 273                ref->next = refs;
 274                refs = ref;
 275        } else {
 276                free(ref);
 277        }
 278
 279        return refs;
 280}
 281
 282static void free_discovery(struct discovery *d)
 283{
 284        if (d) {
 285                if (d == last_discovery)
 286                        last_discovery = NULL;
 287                free(d->shallow.oid);
 288                free(d->buf_alloc);
 289                free_refs(d->refs);
 290                free(d->service);
 291                free(d);
 292        }
 293}
 294
 295static int show_http_message(struct strbuf *type, struct strbuf *charset,
 296                             struct strbuf *msg)
 297{
 298        const char *p, *eol;
 299
 300        /*
 301         * We only show text/plain parts, as other types are likely
 302         * to be ugly to look at on the user's terminal.
 303         */
 304        if (strcmp(type->buf, "text/plain"))
 305                return -1;
 306        if (charset->len)
 307                strbuf_reencode(msg, charset->buf, get_log_output_encoding());
 308
 309        strbuf_trim(msg);
 310        if (!msg->len)
 311                return -1;
 312
 313        p = msg->buf;
 314        do {
 315                eol = strchrnul(p, '\n');
 316                fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 317                p = eol + 1;
 318        } while(*eol);
 319        return 0;
 320}
 321
 322static int get_protocol_http_header(enum protocol_version version,
 323                                    struct strbuf *header)
 324{
 325        if (version > 0) {
 326                strbuf_addf(header, GIT_PROTOCOL_HEADER ": version=%d",
 327                            version);
 328
 329                return 1;
 330        }
 331
 332        return 0;
 333}
 334
 335static void check_smart_http(struct discovery *d, const char *service,
 336                             struct strbuf *type)
 337{
 338        const char *p;
 339        struct packet_reader reader;
 340
 341        /*
 342         * If we don't see x-$service-advertisement, then it's not smart-http.
 343         * But once we do, we commit to it and assume any other protocol
 344         * violations are hard errors.
 345         */
 346        if (!skip_prefix(type->buf, "application/x-", &p) ||
 347            !skip_prefix(p, service, &p) ||
 348            strcmp(p, "-advertisement"))
 349                return;
 350
 351        packet_reader_init(&reader, -1, d->buf, d->len,
 352                           PACKET_READ_CHOMP_NEWLINE |
 353                           PACKET_READ_DIE_ON_ERR_PACKET);
 354        if (packet_reader_read(&reader) != PACKET_READ_NORMAL)
 355                die(_("invalid server response; expected service, got flush packet"));
 356
 357        if (skip_prefix(reader.line, "# service=", &p) && !strcmp(p, service)) {
 358                /*
 359                 * The header can include additional metadata lines, up
 360                 * until a packet flush marker.  Ignore these now, but
 361                 * in the future we might start to scan them.
 362                 */
 363                for (;;) {
 364                        packet_reader_read(&reader);
 365                        if (reader.pktlen <= 0) {
 366                                break;
 367                        }
 368                }
 369
 370                /*
 371                 * v0 smart http; callers expect us to soak up the
 372                 * service and header packets
 373                 */
 374                d->buf = reader.src_buffer;
 375                d->len = reader.src_len;
 376                d->proto_git = 1;
 377
 378        } else if (!strcmp(reader.line, "version 2")) {
 379                /*
 380                 * v2 smart http; do not consume version packet, which will
 381                 * be handled elsewhere.
 382                 */
 383                d->proto_git = 1;
 384
 385        } else {
 386                die(_("invalid server response; got '%s'"), reader.line);
 387        }
 388}
 389
 390static struct discovery *discover_refs(const char *service, int for_push)
 391{
 392        struct strbuf type = STRBUF_INIT;
 393        struct strbuf charset = STRBUF_INIT;
 394        struct strbuf buffer = STRBUF_INIT;
 395        struct strbuf refs_url = STRBUF_INIT;
 396        struct strbuf effective_url = STRBUF_INIT;
 397        struct strbuf protocol_header = STRBUF_INIT;
 398        struct string_list extra_headers = STRING_LIST_INIT_DUP;
 399        struct discovery *last = last_discovery;
 400        int http_ret, maybe_smart = 0;
 401        struct http_get_options http_options;
 402        enum protocol_version version = get_protocol_version_config();
 403
 404        if (last && !strcmp(service, last->service))
 405                return last;
 406        free_discovery(last);
 407
 408        strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 409        if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 410             git_env_bool("GIT_SMART_HTTP", 1)) {
 411                maybe_smart = 1;
 412                if (!strchr(url.buf, '?'))
 413                        strbuf_addch(&refs_url, '?');
 414                else
 415                        strbuf_addch(&refs_url, '&');
 416                strbuf_addf(&refs_url, "service=%s", service);
 417        }
 418
 419        /*
 420         * NEEDSWORK: If we are trying to use protocol v2 and we are planning
 421         * to perform a push, then fallback to v0 since the client doesn't know
 422         * how to push yet using v2.
 423         */
 424        if (version == protocol_v2 && !strcmp("git-receive-pack", service))
 425                version = protocol_v0;
 426
 427        /* Add the extra Git-Protocol header */
 428        if (get_protocol_http_header(version, &protocol_header))
 429                string_list_append(&extra_headers, protocol_header.buf);
 430
 431        memset(&http_options, 0, sizeof(http_options));
 432        http_options.content_type = &type;
 433        http_options.charset = &charset;
 434        http_options.effective_url = &effective_url;
 435        http_options.base_url = &url;
 436        http_options.extra_headers = &extra_headers;
 437        http_options.initial_request = 1;
 438        http_options.no_cache = 1;
 439
 440        http_ret = http_get_strbuf(refs_url.buf, &buffer, &http_options);
 441        switch (http_ret) {
 442        case HTTP_OK:
 443                break;
 444        case HTTP_MISSING_TARGET:
 445                show_http_message(&type, &charset, &buffer);
 446                die(_("repository '%s' not found"),
 447                    transport_anonymize_url(url.buf));
 448        case HTTP_NOAUTH:
 449                show_http_message(&type, &charset, &buffer);
 450                die(_("Authentication failed for '%s'"),
 451                    transport_anonymize_url(url.buf));
 452        default:
 453                show_http_message(&type, &charset, &buffer);
 454                die(_("unable to access '%s': %s"),
 455                    transport_anonymize_url(url.buf), curl_errorstr);
 456        }
 457
 458        if (options.verbosity && !starts_with(refs_url.buf, url.buf)) {
 459                char *u = transport_anonymize_url(url.buf);
 460                warning(_("redirecting to %s"), u);
 461                free(u);
 462        }
 463
 464        last= xcalloc(1, sizeof(*last_discovery));
 465        last->service = xstrdup(service);
 466        last->buf_alloc = strbuf_detach(&buffer, &last->len);
 467        last->buf = last->buf_alloc;
 468
 469        if (maybe_smart)
 470                check_smart_http(last, service, &type);
 471
 472        if (last->proto_git)
 473                last->refs = parse_git_refs(last, for_push);
 474        else
 475                last->refs = parse_info_refs(last);
 476
 477        strbuf_release(&refs_url);
 478        strbuf_release(&type);
 479        strbuf_release(&charset);
 480        strbuf_release(&effective_url);
 481        strbuf_release(&buffer);
 482        strbuf_release(&protocol_header);
 483        string_list_clear(&extra_headers, 0);
 484        last_discovery = last;
 485        return last;
 486}
 487
 488static struct ref *get_refs(int for_push)
 489{
 490        struct discovery *heads;
 491
 492        if (for_push)
 493                heads = discover_refs("git-receive-pack", for_push);
 494        else
 495                heads = discover_refs("git-upload-pack", for_push);
 496
 497        return heads->refs;
 498}
 499
 500static void output_refs(struct ref *refs)
 501{
 502        struct ref *posn;
 503        for (posn = refs; posn; posn = posn->next) {
 504                if (posn->symref)
 505                        printf("@%s %s\n", posn->symref, posn->name);
 506                else
 507                        printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name);
 508        }
 509        printf("\n");
 510        fflush(stdout);
 511}
 512
 513struct rpc_state {
 514        const char *service_name;
 515        char *service_url;
 516        char *hdr_content_type;
 517        char *hdr_accept;
 518        char *protocol_header;
 519        char *buf;
 520        size_t alloc;
 521        size_t len;
 522        size_t pos;
 523        int in;
 524        int out;
 525        int any_written;
 526        unsigned gzip_request : 1;
 527        unsigned initial_buffer : 1;
 528
 529        /*
 530         * Whenever a pkt-line is read into buf, append the 4 characters
 531         * denoting its length before appending the payload.
 532         */
 533        unsigned write_line_lengths : 1;
 534
 535        /*
 536         * Used by rpc_out; initialize to 0. This is true if a flush has been
 537         * read, but the corresponding line length (if write_line_lengths is
 538         * true) and EOF have not been sent to libcurl. Since each flush marks
 539         * the end of a request, each flush must be completely sent before any
 540         * further reading occurs.
 541         */
 542        unsigned flush_read_but_not_sent : 1;
 543};
 544
 545/*
 546 * Appends the result of reading from rpc->out to the string represented by
 547 * rpc->buf and rpc->len if there is enough space. Returns 1 if there was
 548 * enough space, 0 otherwise.
 549 *
 550 * If rpc->write_line_lengths is true, appends the line length as a 4-byte
 551 * hexadecimal string before appending the result described above.
 552 *
 553 * Writes the total number of bytes appended into appended.
 554 */
 555static int rpc_read_from_out(struct rpc_state *rpc, int options,
 556                             size_t *appended,
 557                             enum packet_read_status *status) {
 558        size_t left;
 559        char *buf;
 560        int pktlen_raw;
 561
 562        if (rpc->write_line_lengths) {
 563                left = rpc->alloc - rpc->len - 4;
 564                buf = rpc->buf + rpc->len + 4;
 565        } else {
 566                left = rpc->alloc - rpc->len;
 567                buf = rpc->buf + rpc->len;
 568        }
 569
 570        if (left < LARGE_PACKET_MAX)
 571                return 0;
 572
 573        *status = packet_read_with_status(rpc->out, NULL, NULL, buf,
 574                        left, &pktlen_raw, options);
 575        if (*status != PACKET_READ_EOF) {
 576                *appended = pktlen_raw + (rpc->write_line_lengths ? 4 : 0);
 577                rpc->len += *appended;
 578        }
 579
 580        if (rpc->write_line_lengths) {
 581                switch (*status) {
 582                case PACKET_READ_EOF:
 583                        if (!(options & PACKET_READ_GENTLE_ON_EOF))
 584                                die(_("shouldn't have EOF when not gentle on EOF"));
 585                        break;
 586                case PACKET_READ_NORMAL:
 587                        set_packet_header(buf - 4, *appended);
 588                        break;
 589                case PACKET_READ_DELIM:
 590                        memcpy(buf - 4, "0001", 4);
 591                        break;
 592                case PACKET_READ_FLUSH:
 593                        memcpy(buf - 4, "0000", 4);
 594                        break;
 595                }
 596        }
 597
 598        return 1;
 599}
 600
 601static size_t rpc_out(void *ptr, size_t eltsize,
 602                size_t nmemb, void *buffer_)
 603{
 604        size_t max = eltsize * nmemb;
 605        struct rpc_state *rpc = buffer_;
 606        size_t avail = rpc->len - rpc->pos;
 607        enum packet_read_status status;
 608
 609        if (!avail) {
 610                rpc->initial_buffer = 0;
 611                rpc->len = 0;
 612                rpc->pos = 0;
 613                if (!rpc->flush_read_but_not_sent) {
 614                        if (!rpc_read_from_out(rpc, 0, &avail, &status))
 615                                BUG("The entire rpc->buf should be larger than LARGE_PACKET_MAX");
 616                        if (status == PACKET_READ_FLUSH)
 617                                rpc->flush_read_but_not_sent = 1;
 618                }
 619                /*
 620                 * If flush_read_but_not_sent is true, we have already read one
 621                 * full request but have not fully sent it + EOF, which is why
 622                 * we need to refrain from reading.
 623                 */
 624        }
 625        if (rpc->flush_read_but_not_sent) {
 626                if (!avail) {
 627                        /*
 628                         * The line length either does not need to be sent at
 629                         * all or has already been completely sent. Now we can
 630                         * return 0, indicating EOF, meaning that the flush has
 631                         * been fully sent.
 632                         */
 633                        rpc->flush_read_but_not_sent = 0;
 634                        return 0;
 635                }
 636                /*
 637                 * If avail is non-zerp, the line length for the flush still
 638                 * hasn't been fully sent. Proceed with sending the line
 639                 * length.
 640                 */
 641        }
 642
 643        if (max < avail)
 644                avail = max;
 645        memcpy(ptr, rpc->buf + rpc->pos, avail);
 646        rpc->pos += avail;
 647        return avail;
 648}
 649
 650#ifndef NO_CURL_IOCTL
 651static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 652{
 653        struct rpc_state *rpc = clientp;
 654
 655        switch (cmd) {
 656        case CURLIOCMD_NOP:
 657                return CURLIOE_OK;
 658
 659        case CURLIOCMD_RESTARTREAD:
 660                if (rpc->initial_buffer) {
 661                        rpc->pos = 0;
 662                        return CURLIOE_OK;
 663                }
 664                error(_("unable to rewind rpc post data - try increasing http.postBuffer"));
 665                return CURLIOE_FAILRESTART;
 666
 667        default:
 668                return CURLIOE_UNKNOWNCMD;
 669        }
 670}
 671#endif
 672
 673struct rpc_in_data {
 674        struct rpc_state *rpc;
 675        struct active_request_slot *slot;
 676};
 677
 678/*
 679 * A callback for CURLOPT_WRITEFUNCTION. The return value is the bytes consumed
 680 * from ptr.
 681 */
 682static size_t rpc_in(char *ptr, size_t eltsize,
 683                size_t nmemb, void *buffer_)
 684{
 685        size_t size = eltsize * nmemb;
 686        struct rpc_in_data *data = buffer_;
 687        long response_code;
 688
 689        if (curl_easy_getinfo(data->slot->curl, CURLINFO_RESPONSE_CODE,
 690                              &response_code) != CURLE_OK)
 691                return size;
 692        if (response_code >= 300)
 693                return size;
 694        if (size)
 695                data->rpc->any_written = 1;
 696        write_or_die(data->rpc->in, ptr, size);
 697        return size;
 698}
 699
 700static int run_slot(struct active_request_slot *slot,
 701                    struct slot_results *results)
 702{
 703        int err;
 704        struct slot_results results_buf;
 705
 706        if (!results)
 707                results = &results_buf;
 708
 709        err = run_one_slot(slot, results);
 710
 711        if (err != HTTP_OK && err != HTTP_REAUTH) {
 712                struct strbuf msg = STRBUF_INIT;
 713                if (results->http_code && results->http_code != 200)
 714                        strbuf_addf(&msg, "HTTP %ld", results->http_code);
 715                if (results->curl_result != CURLE_OK) {
 716                        if (msg.len)
 717                                strbuf_addch(&msg, ' ');
 718                        strbuf_addf(&msg, "curl %d", results->curl_result);
 719                        if (curl_errorstr[0]) {
 720                                strbuf_addch(&msg, ' ');
 721                                strbuf_addstr(&msg, curl_errorstr);
 722                        }
 723                }
 724                error(_("RPC failed; %s"), msg.buf);
 725                strbuf_release(&msg);
 726        }
 727
 728        return err;
 729}
 730
 731static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 732{
 733        struct active_request_slot *slot;
 734        struct curl_slist *headers = http_copy_default_headers();
 735        struct strbuf buf = STRBUF_INIT;
 736        int err;
 737
 738        slot = get_active_slot();
 739
 740        headers = curl_slist_append(headers, rpc->hdr_content_type);
 741        headers = curl_slist_append(headers, rpc->hdr_accept);
 742
 743        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 744        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 745        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 746        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 747        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 748        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 749        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 750        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 751        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 752
 753        err = run_slot(slot, results);
 754
 755        curl_slist_free_all(headers);
 756        strbuf_release(&buf);
 757        return err;
 758}
 759
 760static curl_off_t xcurl_off_t(size_t len)
 761{
 762        uintmax_t size = len;
 763        if (size > maximum_signed_value_of_type(curl_off_t))
 764                die(_("cannot handle pushes this big"));
 765        return (curl_off_t)size;
 766}
 767
 768/*
 769 * If flush_received is true, do not attempt to read any more; just use what's
 770 * in rpc->buf.
 771 */
 772static int post_rpc(struct rpc_state *rpc, int flush_received)
 773{
 774        struct active_request_slot *slot;
 775        struct curl_slist *headers = http_copy_default_headers();
 776        int use_gzip = rpc->gzip_request;
 777        char *gzip_body = NULL;
 778        size_t gzip_size = 0;
 779        int err, large_request = 0;
 780        int needs_100_continue = 0;
 781        struct rpc_in_data rpc_in_data;
 782
 783        /* Try to load the entire request, if we can fit it into the
 784         * allocated buffer space we can use HTTP/1.0 and avoid the
 785         * chunked encoding mess.
 786         */
 787        if (!flush_received) {
 788                while (1) {
 789                        size_t n;
 790                        enum packet_read_status status;
 791
 792                        if (!rpc_read_from_out(rpc, 0, &n, &status)) {
 793                                large_request = 1;
 794                                use_gzip = 0;
 795                                break;
 796                        }
 797                        if (status == PACKET_READ_FLUSH)
 798                                break;
 799                }
 800        }
 801
 802        if (large_request) {
 803                struct slot_results results;
 804
 805                do {
 806                        err = probe_rpc(rpc, &results);
 807                        if (err == HTTP_REAUTH)
 808                                credential_fill(&http_auth);
 809                } while (err == HTTP_REAUTH);
 810                if (err != HTTP_OK)
 811                        return -1;
 812
 813                if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 814                        needs_100_continue = 1;
 815        }
 816
 817        headers = curl_slist_append(headers, rpc->hdr_content_type);
 818        headers = curl_slist_append(headers, rpc->hdr_accept);
 819        headers = curl_slist_append(headers, needs_100_continue ?
 820                "Expect: 100-continue" : "Expect:");
 821
 822        /* Add the extra Git-Protocol header */
 823        if (rpc->protocol_header)
 824                headers = curl_slist_append(headers, rpc->protocol_header);
 825
 826retry:
 827        slot = get_active_slot();
 828
 829        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 830        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 831        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 832        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 833
 834        if (large_request) {
 835                /* The request body is large and the size cannot be predicted.
 836                 * We must use chunked encoding to send it.
 837                 */
 838                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 839                rpc->initial_buffer = 1;
 840                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 841                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 842#ifndef NO_CURL_IOCTL
 843                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 844                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 845#endif
 846                if (options.verbosity > 1) {
 847                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 848                        fflush(stderr);
 849                }
 850
 851        } else if (gzip_body) {
 852                /*
 853                 * If we are looping to retry authentication, then the previous
 854                 * run will have set up the headers and gzip buffer already,
 855                 * and we just need to send it.
 856                 */
 857                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 858                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 859
 860        } else if (use_gzip && 1024 < rpc->len) {
 861                /* The client backend isn't giving us compressed data so
 862                 * we can try to deflate it ourselves, this may save on
 863                 * the transfer time.
 864                 */
 865                git_zstream stream;
 866                int ret;
 867
 868                git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 869                gzip_size = git_deflate_bound(&stream, rpc->len);
 870                gzip_body = xmalloc(gzip_size);
 871
 872                stream.next_in = (unsigned char *)rpc->buf;
 873                stream.avail_in = rpc->len;
 874                stream.next_out = (unsigned char *)gzip_body;
 875                stream.avail_out = gzip_size;
 876
 877                ret = git_deflate(&stream, Z_FINISH);
 878                if (ret != Z_STREAM_END)
 879                        die(_("cannot deflate request; zlib deflate error %d"), ret);
 880
 881                ret = git_deflate_end_gently(&stream);
 882                if (ret != Z_OK)
 883                        die(_("cannot deflate request; zlib end error %d"), ret);
 884
 885                gzip_size = stream.total_out;
 886
 887                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 888                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 889                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 890
 891                if (options.verbosity > 1) {
 892                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 893                                rpc->service_name,
 894                                (unsigned long)rpc->len, (unsigned long)gzip_size);
 895                        fflush(stderr);
 896                }
 897        } else {
 898                /* We know the complete request size in advance, use the
 899                 * more normal Content-Length approach.
 900                 */
 901                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 902                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(rpc->len));
 903                if (options.verbosity > 1) {
 904                        fprintf(stderr, "POST %s (%lu bytes)\n",
 905                                rpc->service_name, (unsigned long)rpc->len);
 906                        fflush(stderr);
 907                }
 908        }
 909
 910        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 911        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 912        rpc_in_data.rpc = rpc;
 913        rpc_in_data.slot = slot;
 914        curl_easy_setopt(slot->curl, CURLOPT_FILE, &rpc_in_data);
 915        curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
 916
 917
 918        rpc->any_written = 0;
 919        err = run_slot(slot, NULL);
 920        if (err == HTTP_REAUTH && !large_request) {
 921                credential_fill(&http_auth);
 922                goto retry;
 923        }
 924        if (err != HTTP_OK)
 925                err = -1;
 926
 927        if (!rpc->any_written)
 928                err = -1;
 929
 930        curl_slist_free_all(headers);
 931        free(gzip_body);
 932        return err;
 933}
 934
 935static int rpc_service(struct rpc_state *rpc, struct discovery *heads,
 936                       const char **client_argv, const struct strbuf *preamble,
 937                       struct strbuf *rpc_result)
 938{
 939        const char *svc = rpc->service_name;
 940        struct strbuf buf = STRBUF_INIT;
 941        struct child_process client = CHILD_PROCESS_INIT;
 942        int err = 0;
 943
 944        client.in = -1;
 945        client.out = -1;
 946        client.git_cmd = 1;
 947        client.argv = client_argv;
 948        if (start_command(&client))
 949                exit(1);
 950        write_or_die(client.in, preamble->buf, preamble->len);
 951        if (heads)
 952                write_or_die(client.in, heads->buf, heads->len);
 953
 954        rpc->alloc = http_post_buffer;
 955        rpc->buf = xmalloc(rpc->alloc);
 956        rpc->in = client.in;
 957        rpc->out = client.out;
 958
 959        strbuf_addf(&buf, "%s%s", url.buf, svc);
 960        rpc->service_url = strbuf_detach(&buf, NULL);
 961
 962        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 963        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 964
 965        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 966        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 967
 968        if (get_protocol_http_header(heads->version, &buf))
 969                rpc->protocol_header = strbuf_detach(&buf, NULL);
 970        else
 971                rpc->protocol_header = NULL;
 972
 973        while (!err) {
 974                int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 975                if (!n)
 976                        break;
 977                rpc->pos = 0;
 978                rpc->len = n;
 979                err |= post_rpc(rpc, 0);
 980        }
 981
 982        close(client.in);
 983        client.in = -1;
 984        if (!err) {
 985                strbuf_read(rpc_result, client.out, 0);
 986        } else {
 987                char buf[4096];
 988                for (;;)
 989                        if (xread(client.out, buf, sizeof(buf)) <= 0)
 990                                break;
 991        }
 992
 993        close(client.out);
 994        client.out = -1;
 995
 996        err |= finish_command(&client);
 997        free(rpc->service_url);
 998        free(rpc->hdr_content_type);
 999        free(rpc->hdr_accept);
1000        free(rpc->protocol_header);
1001        free(rpc->buf);
1002        strbuf_release(&buf);
1003        return err;
1004}
1005
1006static int fetch_dumb(int nr_heads, struct ref **to_fetch)
1007{
1008        struct walker *walker;
1009        char **targets;
1010        int ret, i;
1011
1012        ALLOC_ARRAY(targets, nr_heads);
1013        if (options.depth || options.deepen_since)
1014                die(_("dumb http transport does not support shallow capabilities"));
1015        for (i = 0; i < nr_heads; i++)
1016                targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
1017
1018        walker = get_http_walker(url.buf);
1019        walker->get_verbosely = options.verbosity >= 3;
1020        walker->get_recover = 0;
1021        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
1022        walker_free(walker);
1023
1024        for (i = 0; i < nr_heads; i++)
1025                free(targets[i]);
1026        free(targets);
1027
1028        return ret ? error(_("fetch failed.")) : 0;
1029}
1030
1031static int fetch_git(struct discovery *heads,
1032        int nr_heads, struct ref **to_fetch)
1033{
1034        struct rpc_state rpc;
1035        struct strbuf preamble = STRBUF_INIT;
1036        int i, err;
1037        struct argv_array args = ARGV_ARRAY_INIT;
1038        struct strbuf rpc_result = STRBUF_INIT;
1039
1040        argv_array_pushl(&args, "fetch-pack", "--stateless-rpc",
1041                         "--stdin", "--lock-pack", NULL);
1042        if (options.followtags)
1043                argv_array_push(&args, "--include-tag");
1044        if (options.thin)
1045                argv_array_push(&args, "--thin");
1046        if (options.verbosity >= 3)
1047                argv_array_pushl(&args, "-v", "-v", NULL);
1048        if (options.check_self_contained_and_connected)
1049                argv_array_push(&args, "--check-self-contained-and-connected");
1050        if (options.cloning)
1051                argv_array_push(&args, "--cloning");
1052        if (options.update_shallow)
1053                argv_array_push(&args, "--update-shallow");
1054        if (!options.progress)
1055                argv_array_push(&args, "--no-progress");
1056        if (options.depth)
1057                argv_array_pushf(&args, "--depth=%lu", options.depth);
1058        if (options.deepen_since)
1059                argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since);
1060        for (i = 0; i < options.deepen_not.nr; i++)
1061                argv_array_pushf(&args, "--shallow-exclude=%s",
1062                                 options.deepen_not.items[i].string);
1063        if (options.deepen_relative && options.depth)
1064                argv_array_push(&args, "--deepen-relative");
1065        if (options.from_promisor)
1066                argv_array_push(&args, "--from-promisor");
1067        if (options.no_dependents)
1068                argv_array_push(&args, "--no-dependents");
1069        if (options.filter)
1070                argv_array_pushf(&args, "--filter=%s", options.filter);
1071        argv_array_push(&args, url.buf);
1072
1073        for (i = 0; i < nr_heads; i++) {
1074                struct ref *ref = to_fetch[i];
1075                if (!*ref->name)
1076                        die(_("cannot fetch by sha1 over smart http"));
1077                packet_buf_write(&preamble, "%s %s\n",
1078                                 oid_to_hex(&ref->old_oid), ref->name);
1079        }
1080        packet_buf_flush(&preamble);
1081
1082        memset(&rpc, 0, sizeof(rpc));
1083        rpc.service_name = "git-upload-pack",
1084        rpc.gzip_request = 1;
1085
1086        err = rpc_service(&rpc, heads, args.argv, &preamble, &rpc_result);
1087        if (rpc_result.len)
1088                write_or_die(1, rpc_result.buf, rpc_result.len);
1089        strbuf_release(&rpc_result);
1090        strbuf_release(&preamble);
1091        argv_array_clear(&args);
1092        return err;
1093}
1094
1095static int fetch(int nr_heads, struct ref **to_fetch)
1096{
1097        struct discovery *d = discover_refs("git-upload-pack", 0);
1098        if (d->proto_git)
1099                return fetch_git(d, nr_heads, to_fetch);
1100        else
1101                return fetch_dumb(nr_heads, to_fetch);
1102}
1103
1104static void parse_fetch(struct strbuf *buf)
1105{
1106        struct ref **to_fetch = NULL;
1107        struct ref *list_head = NULL;
1108        struct ref **list = &list_head;
1109        int alloc_heads = 0, nr_heads = 0;
1110
1111        do {
1112                const char *p;
1113                if (skip_prefix(buf->buf, "fetch ", &p)) {
1114                        const char *name;
1115                        struct ref *ref;
1116                        struct object_id old_oid;
1117
1118                        if (get_oid_hex(p, &old_oid))
1119                                die(_("protocol error: expected sha/ref, got %s'"), p);
1120                        if (p[GIT_SHA1_HEXSZ] == ' ')
1121                                name = p + GIT_SHA1_HEXSZ + 1;
1122                        else if (!p[GIT_SHA1_HEXSZ])
1123                                name = "";
1124                        else
1125                                die(_("protocol error: expected sha/ref, got %s'"), p);
1126
1127                        ref = alloc_ref(name);
1128                        oidcpy(&ref->old_oid, &old_oid);
1129
1130                        *list = ref;
1131                        list = &ref->next;
1132
1133                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
1134                        to_fetch[nr_heads++] = ref;
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                        return;
1142                if (!*buf->buf)
1143                        break;
1144        } while (1);
1145
1146        if (fetch(nr_heads, to_fetch))
1147                exit(128); /* error already reported */
1148        free_refs(list_head);
1149        free(to_fetch);
1150
1151        printf("\n");
1152        fflush(stdout);
1153        strbuf_reset(buf);
1154}
1155
1156static int push_dav(int nr_spec, char **specs)
1157{
1158        struct child_process child = CHILD_PROCESS_INIT;
1159        size_t i;
1160
1161        child.git_cmd = 1;
1162        argv_array_push(&child.args, "http-push");
1163        argv_array_push(&child.args, "--helper-status");
1164        if (options.dry_run)
1165                argv_array_push(&child.args, "--dry-run");
1166        if (options.verbosity > 1)
1167                argv_array_push(&child.args, "--verbose");
1168        argv_array_push(&child.args, url.buf);
1169        for (i = 0; i < nr_spec; i++)
1170                argv_array_push(&child.args, specs[i]);
1171
1172        if (run_command(&child))
1173                die(_("git-http-push failed"));
1174        return 0;
1175}
1176
1177static int push_git(struct discovery *heads, int nr_spec, char **specs)
1178{
1179        struct rpc_state rpc;
1180        int i, err;
1181        struct argv_array args;
1182        struct string_list_item *cas_option;
1183        struct strbuf preamble = STRBUF_INIT;
1184        struct strbuf rpc_result = STRBUF_INIT;
1185
1186        argv_array_init(&args);
1187        argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
1188                         NULL);
1189
1190        if (options.thin)
1191                argv_array_push(&args, "--thin");
1192        if (options.dry_run)
1193                argv_array_push(&args, "--dry-run");
1194        if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
1195                argv_array_push(&args, "--signed=yes");
1196        else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
1197                argv_array_push(&args, "--signed=if-asked");
1198        if (options.verbosity == 0)
1199                argv_array_push(&args, "--quiet");
1200        else if (options.verbosity > 1)
1201                argv_array_push(&args, "--verbose");
1202        for (i = 0; i < options.push_options.nr; i++)
1203                argv_array_pushf(&args, "--push-option=%s",
1204                                 options.push_options.items[i].string);
1205        argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
1206        for_each_string_list_item(cas_option, &cas_options)
1207                argv_array_push(&args, cas_option->string);
1208        argv_array_push(&args, url.buf);
1209
1210        argv_array_push(&args, "--stdin");
1211        for (i = 0; i < nr_spec; i++)
1212                packet_buf_write(&preamble, "%s\n", specs[i]);
1213        packet_buf_flush(&preamble);
1214
1215        memset(&rpc, 0, sizeof(rpc));
1216        rpc.service_name = "git-receive-pack",
1217
1218        err = rpc_service(&rpc, heads, args.argv, &preamble, &rpc_result);
1219        if (rpc_result.len)
1220                write_or_die(1, rpc_result.buf, rpc_result.len);
1221        strbuf_release(&rpc_result);
1222        strbuf_release(&preamble);
1223        argv_array_clear(&args);
1224        return err;
1225}
1226
1227static int push(int nr_spec, char **specs)
1228{
1229        struct discovery *heads = discover_refs("git-receive-pack", 1);
1230        int ret;
1231
1232        if (heads->proto_git)
1233                ret = push_git(heads, nr_spec, specs);
1234        else
1235                ret = push_dav(nr_spec, specs);
1236        free_discovery(heads);
1237        return ret;
1238}
1239
1240static void parse_push(struct strbuf *buf)
1241{
1242        char **specs = NULL;
1243        int alloc_spec = 0, nr_spec = 0, i, ret;
1244
1245        do {
1246                if (starts_with(buf->buf, "push ")) {
1247                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
1248                        specs[nr_spec++] = xstrdup(buf->buf + 5);
1249                }
1250                else
1251                        die(_("http transport does not support %s"), buf->buf);
1252
1253                strbuf_reset(buf);
1254                if (strbuf_getline_lf(buf, stdin) == EOF)
1255                        goto free_specs;
1256                if (!*buf->buf)
1257                        break;
1258        } while (1);
1259
1260        ret = push(nr_spec, specs);
1261        printf("\n");
1262        fflush(stdout);
1263
1264        if (ret)
1265                exit(128); /* error already reported */
1266
1267 free_specs:
1268        for (i = 0; i < nr_spec; i++)
1269                free(specs[i]);
1270        free(specs);
1271}
1272
1273static int stateless_connect(const char *service_name)
1274{
1275        struct discovery *discover;
1276        struct rpc_state rpc;
1277        struct strbuf buf = STRBUF_INIT;
1278
1279        /*
1280         * Run the info/refs request and see if the server supports protocol
1281         * v2.  If and only if the server supports v2 can we successfully
1282         * establish a stateless connection, otherwise we need to tell the
1283         * client to fallback to using other transport helper functions to
1284         * complete their request.
1285         */
1286        discover = discover_refs(service_name, 0);
1287        if (discover->version != protocol_v2) {
1288                printf("fallback\n");
1289                fflush(stdout);
1290                return -1;
1291        } else {
1292                /* Stateless Connection established */
1293                printf("\n");
1294                fflush(stdout);
1295        }
1296
1297        rpc.service_name = service_name;
1298        rpc.service_url = xstrfmt("%s%s", url.buf, rpc.service_name);
1299        rpc.hdr_content_type = xstrfmt("Content-Type: application/x-%s-request", rpc.service_name);
1300        rpc.hdr_accept = xstrfmt("Accept: application/x-%s-result", rpc.service_name);
1301        if (get_protocol_http_header(discover->version, &buf)) {
1302                rpc.protocol_header = strbuf_detach(&buf, NULL);
1303        } else {
1304                rpc.protocol_header = NULL;
1305                strbuf_release(&buf);
1306        }
1307        rpc.buf = xmalloc(http_post_buffer);
1308        rpc.alloc = http_post_buffer;
1309        rpc.len = 0;
1310        rpc.pos = 0;
1311        rpc.in = 1;
1312        rpc.out = 0;
1313        rpc.any_written = 0;
1314        rpc.gzip_request = 1;
1315        rpc.initial_buffer = 0;
1316        rpc.write_line_lengths = 1;
1317        rpc.flush_read_but_not_sent = 0;
1318
1319        /*
1320         * Dump the capability listing that we got from the server earlier
1321         * during the info/refs request.
1322         */
1323        write_or_die(rpc.in, discover->buf, discover->len);
1324
1325        /* Until we see EOF keep sending POSTs */
1326        while (1) {
1327                size_t avail;
1328                enum packet_read_status status;
1329
1330                if (!rpc_read_from_out(&rpc, PACKET_READ_GENTLE_ON_EOF, &avail,
1331                                       &status))
1332                        BUG("The entire rpc->buf should be larger than LARGE_PACKET_MAX");
1333                if (status == PACKET_READ_EOF)
1334                        break;
1335                if (post_rpc(&rpc, status == PACKET_READ_FLUSH))
1336                        /* We would have an err here */
1337                        break;
1338                /* Reset the buffer for next request */
1339                rpc.len = 0;
1340        }
1341
1342        free(rpc.service_url);
1343        free(rpc.hdr_content_type);
1344        free(rpc.hdr_accept);
1345        free(rpc.protocol_header);
1346        free(rpc.buf);
1347        strbuf_release(&buf);
1348
1349        return 0;
1350}
1351
1352int cmd_main(int argc, const char **argv)
1353{
1354        struct strbuf buf = STRBUF_INIT;
1355        int nongit;
1356
1357        setup_git_directory_gently(&nongit);
1358        if (argc < 2) {
1359                error(_("remote-curl: usage: git remote-curl <remote> [<url>]"));
1360                return 1;
1361        }
1362
1363        options.verbosity = 1;
1364        options.progress = !!isatty(2);
1365        options.thin = 1;
1366        string_list_init(&options.deepen_not, 1);
1367        string_list_init(&options.push_options, 1);
1368
1369        /*
1370         * Just report "remote-curl" here (folding all the various aliases
1371         * ("git-remote-http", "git-remote-https", and etc.) here since they
1372         * are all just copies of the same actual executable.
1373         */
1374        trace2_cmd_name("remote-curl");
1375
1376        remote = remote_get(argv[1]);
1377
1378        if (argc > 2) {
1379                end_url_with_slash(&url, argv[2]);
1380        } else {
1381                end_url_with_slash(&url, remote->url[0]);
1382        }
1383
1384        http_init(remote, url.buf, 0);
1385
1386        do {
1387                const char *arg;
1388
1389                if (strbuf_getline_lf(&buf, stdin) == EOF) {
1390                        if (ferror(stdin))
1391                                error(_("remote-curl: error reading command stream from git"));
1392                        return 1;
1393                }
1394                if (buf.len == 0)
1395                        break;
1396                if (starts_with(buf.buf, "fetch ")) {
1397                        if (nongit)
1398                                die(_("remote-curl: fetch attempted without a local repo"));
1399                        parse_fetch(&buf);
1400
1401                } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1402                        int for_push = !!strstr(buf.buf + 4, "for-push");
1403                        output_refs(get_refs(for_push));
1404
1405                } else if (starts_with(buf.buf, "push ")) {
1406                        parse_push(&buf);
1407
1408                } else if (skip_prefix(buf.buf, "option ", &arg)) {
1409                        char *value = strchr(arg, ' ');
1410                        int result;
1411
1412                        if (value)
1413                                *value++ = '\0';
1414                        else
1415                                value = "true";
1416
1417                        result = set_option(arg, value);
1418                        if (!result)
1419                                printf("ok\n");
1420                        else if (result < 0)
1421                                printf("error invalid value\n");
1422                        else
1423                                printf("unsupported\n");
1424                        fflush(stdout);
1425
1426                } else if (!strcmp(buf.buf, "capabilities")) {
1427                        printf("stateless-connect\n");
1428                        printf("fetch\n");
1429                        printf("option\n");
1430                        printf("push\n");
1431                        printf("check-connectivity\n");
1432                        printf("\n");
1433                        fflush(stdout);
1434                } else if (skip_prefix(buf.buf, "stateless-connect ", &arg)) {
1435                        if (!stateless_connect(arg))
1436                                break;
1437                } else {
1438                        error(_("remote-curl: unknown command '%s' from git"), buf.buf);
1439                        return 1;
1440                }
1441                strbuf_reset(&buf);
1442        } while (1);
1443
1444        http_cleanup();
1445
1446        return 0;
1447}