Andrew's git / gitweb.git / remote-curl.c
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remote-curl.con commit commit-graph: compute generation numbers (3258c66)
   1#include "cache.h"
   2#include "config.h"
   3#include "remote.h"
   4#include "strbuf.h"
   5#include "walker.h"
   6#include "http.h"
   7#include "exec_cmd.h"
   8#include "run-command.h"
   9#include "pkt-line.h"
  10#include "string-list.h"
  11#include "sideband.h"
  12#include "argv-array.h"
  13#include "credential.h"
  14#include "sha1-array.h"
  15#include "send-pack.h"
  16
  17static struct remote *remote;
  18/* always ends with a trailing slash */
  19static struct strbuf url = STRBUF_INIT;
  20
  21struct options {
  22        int verbosity;
  23        unsigned long depth;
  24        char *deepen_since;
  25        struct string_list deepen_not;
  26        struct string_list push_options;
  27        char *filter;
  28        unsigned progress : 1,
  29                check_self_contained_and_connected : 1,
  30                cloning : 1,
  31                update_shallow : 1,
  32                followtags : 1,
  33                dry_run : 1,
  34                thin : 1,
  35                /* One of the SEND_PACK_PUSH_CERT_* constants. */
  36                push_cert : 2,
  37                deepen_relative : 1,
  38                from_promisor : 1,
  39                no_dependents : 1;
  40};
  41static struct options options;
  42static struct string_list cas_options = STRING_LIST_INIT_DUP;
  43
  44static int set_option(const char *name, const char *value)
  45{
  46        if (!strcmp(name, "verbosity")) {
  47                char *end;
  48                int v = strtol(value, &end, 10);
  49                if (value == end || *end)
  50                        return -1;
  51                options.verbosity = v;
  52                return 0;
  53        }
  54        else if (!strcmp(name, "progress")) {
  55                if (!strcmp(value, "true"))
  56                        options.progress = 1;
  57                else if (!strcmp(value, "false"))
  58                        options.progress = 0;
  59                else
  60                        return -1;
  61                return 0;
  62        }
  63        else if (!strcmp(name, "depth")) {
  64                char *end;
  65                unsigned long v = strtoul(value, &end, 10);
  66                if (value == end || *end)
  67                        return -1;
  68                options.depth = v;
  69                return 0;
  70        }
  71        else if (!strcmp(name, "deepen-since")) {
  72                options.deepen_since = xstrdup(value);
  73                return 0;
  74        }
  75        else if (!strcmp(name, "deepen-not")) {
  76                string_list_append(&options.deepen_not, value);
  77                return 0;
  78        }
  79        else if (!strcmp(name, "deepen-relative")) {
  80                if (!strcmp(value, "true"))
  81                        options.deepen_relative = 1;
  82                else if (!strcmp(value, "false"))
  83                        options.deepen_relative = 0;
  84                else
  85                        return -1;
  86                return 0;
  87        }
  88        else if (!strcmp(name, "followtags")) {
  89                if (!strcmp(value, "true"))
  90                        options.followtags = 1;
  91                else if (!strcmp(value, "false"))
  92                        options.followtags = 0;
  93                else
  94                        return -1;
  95                return 0;
  96        }
  97        else if (!strcmp(name, "dry-run")) {
  98                if (!strcmp(value, "true"))
  99                        options.dry_run = 1;
 100                else if (!strcmp(value, "false"))
 101                        options.dry_run = 0;
 102                else
 103                        return -1;
 104                return 0;
 105        }
 106        else if (!strcmp(name, "check-connectivity")) {
 107                if (!strcmp(value, "true"))
 108                        options.check_self_contained_and_connected = 1;
 109                else if (!strcmp(value, "false"))
 110                        options.check_self_contained_and_connected = 0;
 111                else
 112                        return -1;
 113                return 0;
 114        }
 115        else if (!strcmp(name, "cas")) {
 116                struct strbuf val = STRBUF_INIT;
 117                strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
 118                string_list_append(&cas_options, val.buf);
 119                strbuf_release(&val);
 120                return 0;
 121        } else if (!strcmp(name, "cloning")) {
 122                if (!strcmp(value, "true"))
 123                        options.cloning = 1;
 124                else if (!strcmp(value, "false"))
 125                        options.cloning = 0;
 126                else
 127                        return -1;
 128                return 0;
 129        } else if (!strcmp(name, "update-shallow")) {
 130                if (!strcmp(value, "true"))
 131                        options.update_shallow = 1;
 132                else if (!strcmp(value, "false"))
 133                        options.update_shallow = 0;
 134                else
 135                        return -1;
 136                return 0;
 137        } else if (!strcmp(name, "pushcert")) {
 138                if (!strcmp(value, "true"))
 139                        options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 140                else if (!strcmp(value, "false"))
 141                        options.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 142                else if (!strcmp(value, "if-asked"))
 143                        options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 144                else
 145                        return -1;
 146                return 0;
 147        } else if (!strcmp(name, "push-option")) {
 148                string_list_append(&options.push_options, value);
 149                return 0;
 150
 151#if LIBCURL_VERSION_NUM >= 0x070a08
 152        } else if (!strcmp(name, "family")) {
 153                if (!strcmp(value, "ipv4"))
 154                        git_curl_ipresolve = CURL_IPRESOLVE_V4;
 155                else if (!strcmp(value, "ipv6"))
 156                        git_curl_ipresolve = CURL_IPRESOLVE_V6;
 157                else if (!strcmp(value, "all"))
 158                        git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
 159                else
 160                        return -1;
 161                return 0;
 162#endif /* LIBCURL_VERSION_NUM >= 0x070a08 */
 163        } else if (!strcmp(name, "from-promisor")) {
 164                options.from_promisor = 1;
 165                return 0;
 166        } else if (!strcmp(name, "no-dependents")) {
 167                options.no_dependents = 1;
 168                return 0;
 169        } else if (!strcmp(name, "filter")) {
 170                options.filter = xstrdup(value);;
 171                return 0;
 172        } else {
 173                return 1 /* unsupported */;
 174        }
 175}
 176
 177struct discovery {
 178        const char *service;
 179        char *buf_alloc;
 180        char *buf;
 181        size_t len;
 182        struct ref *refs;
 183        struct oid_array shallow;
 184        unsigned proto_git : 1;
 185};
 186static struct discovery *last_discovery;
 187
 188static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 189{
 190        struct ref *list = NULL;
 191        get_remote_heads(-1, heads->buf, heads->len, &list,
 192                         for_push ? REF_NORMAL : 0, NULL, &heads->shallow);
 193        return list;
 194}
 195
 196static struct ref *parse_info_refs(struct discovery *heads)
 197{
 198        char *data, *start, *mid;
 199        char *ref_name;
 200        int i = 0;
 201
 202        struct ref *refs = NULL;
 203        struct ref *ref = NULL;
 204        struct ref *last_ref = NULL;
 205
 206        data = heads->buf;
 207        start = NULL;
 208        mid = data;
 209        while (i < heads->len) {
 210                if (!start) {
 211                        start = &data[i];
 212                }
 213                if (data[i] == '\t')
 214                        mid = &data[i];
 215                if (data[i] == '\n') {
 216                        if (mid - start != 40)
 217                                die("%sinfo/refs not valid: is this a git repository?",
 218                                    url.buf);
 219                        data[i] = 0;
 220                        ref_name = mid + 1;
 221                        ref = alloc_ref(ref_name);
 222                        get_oid_hex(start, &ref->old_oid);
 223                        if (!refs)
 224                                refs = ref;
 225                        if (last_ref)
 226                                last_ref->next = ref;
 227                        last_ref = ref;
 228                        start = NULL;
 229                }
 230                i++;
 231        }
 232
 233        ref = alloc_ref("HEAD");
 234        if (!http_fetch_ref(url.buf, ref) &&
 235            !resolve_remote_symref(ref, refs)) {
 236                ref->next = refs;
 237                refs = ref;
 238        } else {
 239                free(ref);
 240        }
 241
 242        return refs;
 243}
 244
 245static void free_discovery(struct discovery *d)
 246{
 247        if (d) {
 248                if (d == last_discovery)
 249                        last_discovery = NULL;
 250                free(d->shallow.oid);
 251                free(d->buf_alloc);
 252                free_refs(d->refs);
 253                free(d);
 254        }
 255}
 256
 257static int show_http_message(struct strbuf *type, struct strbuf *charset,
 258                             struct strbuf *msg)
 259{
 260        const char *p, *eol;
 261
 262        /*
 263         * We only show text/plain parts, as other types are likely
 264         * to be ugly to look at on the user's terminal.
 265         */
 266        if (strcmp(type->buf, "text/plain"))
 267                return -1;
 268        if (charset->len)
 269                strbuf_reencode(msg, charset->buf, get_log_output_encoding());
 270
 271        strbuf_trim(msg);
 272        if (!msg->len)
 273                return -1;
 274
 275        p = msg->buf;
 276        do {
 277                eol = strchrnul(p, '\n');
 278                fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 279                p = eol + 1;
 280        } while(*eol);
 281        return 0;
 282}
 283
 284static struct discovery *discover_refs(const char *service, int for_push)
 285{
 286        struct strbuf exp = STRBUF_INIT;
 287        struct strbuf type = STRBUF_INIT;
 288        struct strbuf charset = STRBUF_INIT;
 289        struct strbuf buffer = STRBUF_INIT;
 290        struct strbuf refs_url = STRBUF_INIT;
 291        struct strbuf effective_url = STRBUF_INIT;
 292        struct discovery *last = last_discovery;
 293        int http_ret, maybe_smart = 0;
 294        struct http_get_options http_options;
 295
 296        if (last && !strcmp(service, last->service))
 297                return last;
 298        free_discovery(last);
 299
 300        strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 301        if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 302             git_env_bool("GIT_SMART_HTTP", 1)) {
 303                maybe_smart = 1;
 304                if (!strchr(url.buf, '?'))
 305                        strbuf_addch(&refs_url, '?');
 306                else
 307                        strbuf_addch(&refs_url, '&');
 308                strbuf_addf(&refs_url, "service=%s", service);
 309        }
 310
 311        memset(&http_options, 0, sizeof(http_options));
 312        http_options.content_type = &type;
 313        http_options.charset = &charset;
 314        http_options.effective_url = &effective_url;
 315        http_options.base_url = &url;
 316        http_options.initial_request = 1;
 317        http_options.no_cache = 1;
 318        http_options.keep_error = 1;
 319
 320        http_ret = http_get_strbuf(refs_url.buf, &buffer, &http_options);
 321        switch (http_ret) {
 322        case HTTP_OK:
 323                break;
 324        case HTTP_MISSING_TARGET:
 325                show_http_message(&type, &charset, &buffer);
 326                die("repository '%s' not found", url.buf);
 327        case HTTP_NOAUTH:
 328                show_http_message(&type, &charset, &buffer);
 329                die("Authentication failed for '%s'", url.buf);
 330        default:
 331                show_http_message(&type, &charset, &buffer);
 332                die("unable to access '%s': %s", url.buf, curl_errorstr);
 333        }
 334
 335        if (options.verbosity && !starts_with(refs_url.buf, url.buf))
 336                warning(_("redirecting to %s"), url.buf);
 337
 338        last= xcalloc(1, sizeof(*last_discovery));
 339        last->service = service;
 340        last->buf_alloc = strbuf_detach(&buffer, &last->len);
 341        last->buf = last->buf_alloc;
 342
 343        strbuf_addf(&exp, "application/x-%s-advertisement", service);
 344        if (maybe_smart &&
 345            (5 <= last->len && last->buf[4] == '#') &&
 346            !strbuf_cmp(&exp, &type)) {
 347                char *line;
 348
 349                /*
 350                 * smart HTTP response; validate that the service
 351                 * pkt-line matches our request.
 352                 */
 353                line = packet_read_line_buf(&last->buf, &last->len, NULL);
 354
 355                strbuf_reset(&exp);
 356                strbuf_addf(&exp, "# service=%s", service);
 357                if (strcmp(line, exp.buf))
 358                        die("invalid server response; got '%s'", line);
 359                strbuf_release(&exp);
 360
 361                /* The header can include additional metadata lines, up
 362                 * until a packet flush marker.  Ignore these now, but
 363                 * in the future we might start to scan them.
 364                 */
 365                while (packet_read_line_buf(&last->buf, &last->len, NULL))
 366                        ;
 367
 368                last->proto_git = 1;
 369        }
 370
 371        if (last->proto_git)
 372                last->refs = parse_git_refs(last, for_push);
 373        else
 374                last->refs = parse_info_refs(last);
 375
 376        strbuf_release(&refs_url);
 377        strbuf_release(&exp);
 378        strbuf_release(&type);
 379        strbuf_release(&charset);
 380        strbuf_release(&effective_url);
 381        strbuf_release(&buffer);
 382        last_discovery = last;
 383        return last;
 384}
 385
 386static struct ref *get_refs(int for_push)
 387{
 388        struct discovery *heads;
 389
 390        if (for_push)
 391                heads = discover_refs("git-receive-pack", for_push);
 392        else
 393                heads = discover_refs("git-upload-pack", for_push);
 394
 395        return heads->refs;
 396}
 397
 398static void output_refs(struct ref *refs)
 399{
 400        struct ref *posn;
 401        for (posn = refs; posn; posn = posn->next) {
 402                if (posn->symref)
 403                        printf("@%s %s\n", posn->symref, posn->name);
 404                else
 405                        printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name);
 406        }
 407        printf("\n");
 408        fflush(stdout);
 409}
 410
 411struct rpc_state {
 412        const char *service_name;
 413        const char **argv;
 414        struct strbuf *stdin_preamble;
 415        char *service_url;
 416        char *hdr_content_type;
 417        char *hdr_accept;
 418        char *buf;
 419        size_t alloc;
 420        size_t len;
 421        size_t pos;
 422        int in;
 423        int out;
 424        int any_written;
 425        struct strbuf result;
 426        unsigned gzip_request : 1;
 427        unsigned initial_buffer : 1;
 428};
 429
 430static size_t rpc_out(void *ptr, size_t eltsize,
 431                size_t nmemb, void *buffer_)
 432{
 433        size_t max = eltsize * nmemb;
 434        struct rpc_state *rpc = buffer_;
 435        size_t avail = rpc->len - rpc->pos;
 436
 437        if (!avail) {
 438                rpc->initial_buffer = 0;
 439                avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 440                if (!avail)
 441                        return 0;
 442                rpc->pos = 0;
 443                rpc->len = avail;
 444        }
 445
 446        if (max < avail)
 447                avail = max;
 448        memcpy(ptr, rpc->buf + rpc->pos, avail);
 449        rpc->pos += avail;
 450        return avail;
 451}
 452
 453#ifndef NO_CURL_IOCTL
 454static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 455{
 456        struct rpc_state *rpc = clientp;
 457
 458        switch (cmd) {
 459        case CURLIOCMD_NOP:
 460                return CURLIOE_OK;
 461
 462        case CURLIOCMD_RESTARTREAD:
 463                if (rpc->initial_buffer) {
 464                        rpc->pos = 0;
 465                        return CURLIOE_OK;
 466                }
 467                error("unable to rewind rpc post data - try increasing http.postBuffer");
 468                return CURLIOE_FAILRESTART;
 469
 470        default:
 471                return CURLIOE_UNKNOWNCMD;
 472        }
 473}
 474#endif
 475
 476static size_t rpc_in(char *ptr, size_t eltsize,
 477                size_t nmemb, void *buffer_)
 478{
 479        size_t size = eltsize * nmemb;
 480        struct rpc_state *rpc = buffer_;
 481        if (size)
 482                rpc->any_written = 1;
 483        write_or_die(rpc->in, ptr, size);
 484        return size;
 485}
 486
 487static int run_slot(struct active_request_slot *slot,
 488                    struct slot_results *results)
 489{
 490        int err;
 491        struct slot_results results_buf;
 492
 493        if (!results)
 494                results = &results_buf;
 495
 496        err = run_one_slot(slot, results);
 497
 498        if (err != HTTP_OK && err != HTTP_REAUTH) {
 499                struct strbuf msg = STRBUF_INIT;
 500                if (results->http_code && results->http_code != 200)
 501                        strbuf_addf(&msg, "HTTP %ld", results->http_code);
 502                if (results->curl_result != CURLE_OK) {
 503                        if (msg.len)
 504                                strbuf_addch(&msg, ' ');
 505                        strbuf_addf(&msg, "curl %d", results->curl_result);
 506                        if (curl_errorstr[0]) {
 507                                strbuf_addch(&msg, ' ');
 508                                strbuf_addstr(&msg, curl_errorstr);
 509                        }
 510                }
 511                error("RPC failed; %s", msg.buf);
 512                strbuf_release(&msg);
 513        }
 514
 515        return err;
 516}
 517
 518static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 519{
 520        struct active_request_slot *slot;
 521        struct curl_slist *headers = http_copy_default_headers();
 522        struct strbuf buf = STRBUF_INIT;
 523        int err;
 524
 525        slot = get_active_slot();
 526
 527        headers = curl_slist_append(headers, rpc->hdr_content_type);
 528        headers = curl_slist_append(headers, rpc->hdr_accept);
 529
 530        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 531        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 532        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 533        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 534        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 535        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 536        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 537        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 538        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 539
 540        err = run_slot(slot, results);
 541
 542        curl_slist_free_all(headers);
 543        strbuf_release(&buf);
 544        return err;
 545}
 546
 547static curl_off_t xcurl_off_t(ssize_t len) {
 548        if (len > maximum_signed_value_of_type(curl_off_t))
 549                die("cannot handle pushes this big");
 550        return (curl_off_t) len;
 551}
 552
 553static int post_rpc(struct rpc_state *rpc)
 554{
 555        struct active_request_slot *slot;
 556        struct curl_slist *headers = http_copy_default_headers();
 557        int use_gzip = rpc->gzip_request;
 558        char *gzip_body = NULL;
 559        size_t gzip_size = 0;
 560        int err, large_request = 0;
 561        int needs_100_continue = 0;
 562
 563        /* Try to load the entire request, if we can fit it into the
 564         * allocated buffer space we can use HTTP/1.0 and avoid the
 565         * chunked encoding mess.
 566         */
 567        while (1) {
 568                size_t left = rpc->alloc - rpc->len;
 569                char *buf = rpc->buf + rpc->len;
 570                int n;
 571
 572                if (left < LARGE_PACKET_MAX) {
 573                        large_request = 1;
 574                        use_gzip = 0;
 575                        break;
 576                }
 577
 578                n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 579                if (!n)
 580                        break;
 581                rpc->len += n;
 582        }
 583
 584        if (large_request) {
 585                struct slot_results results;
 586
 587                do {
 588                        err = probe_rpc(rpc, &results);
 589                        if (err == HTTP_REAUTH)
 590                                credential_fill(&http_auth);
 591                } while (err == HTTP_REAUTH);
 592                if (err != HTTP_OK)
 593                        return -1;
 594
 595                if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 596                        needs_100_continue = 1;
 597        }
 598
 599        headers = curl_slist_append(headers, rpc->hdr_content_type);
 600        headers = curl_slist_append(headers, rpc->hdr_accept);
 601        headers = curl_slist_append(headers, needs_100_continue ?
 602                "Expect: 100-continue" : "Expect:");
 603
 604retry:
 605        slot = get_active_slot();
 606
 607        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 608        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 609        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 610        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 611
 612        if (large_request) {
 613                /* The request body is large and the size cannot be predicted.
 614                 * We must use chunked encoding to send it.
 615                 */
 616                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 617                rpc->initial_buffer = 1;
 618                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 619                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 620#ifndef NO_CURL_IOCTL
 621                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 622                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 623#endif
 624                if (options.verbosity > 1) {
 625                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 626                        fflush(stderr);
 627                }
 628
 629        } else if (gzip_body) {
 630                /*
 631                 * If we are looping to retry authentication, then the previous
 632                 * run will have set up the headers and gzip buffer already,
 633                 * and we just need to send it.
 634                 */
 635                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 636                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 637
 638        } else if (use_gzip && 1024 < rpc->len) {
 639                /* The client backend isn't giving us compressed data so
 640                 * we can try to deflate it ourselves, this may save on.
 641                 * the transfer time.
 642                 */
 643                git_zstream stream;
 644                int ret;
 645
 646                git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 647                gzip_size = git_deflate_bound(&stream, rpc->len);
 648                gzip_body = xmalloc(gzip_size);
 649
 650                stream.next_in = (unsigned char *)rpc->buf;
 651                stream.avail_in = rpc->len;
 652                stream.next_out = (unsigned char *)gzip_body;
 653                stream.avail_out = gzip_size;
 654
 655                ret = git_deflate(&stream, Z_FINISH);
 656                if (ret != Z_STREAM_END)
 657                        die("cannot deflate request; zlib deflate error %d", ret);
 658
 659                ret = git_deflate_end_gently(&stream);
 660                if (ret != Z_OK)
 661                        die("cannot deflate request; zlib end error %d", ret);
 662
 663                gzip_size = stream.total_out;
 664
 665                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 666                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 667                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 668
 669                if (options.verbosity > 1) {
 670                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 671                                rpc->service_name,
 672                                (unsigned long)rpc->len, (unsigned long)gzip_size);
 673                        fflush(stderr);
 674                }
 675        } else {
 676                /* We know the complete request size in advance, use the
 677                 * more normal Content-Length approach.
 678                 */
 679                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 680                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(rpc->len));
 681                if (options.verbosity > 1) {
 682                        fprintf(stderr, "POST %s (%lu bytes)\n",
 683                                rpc->service_name, (unsigned long)rpc->len);
 684                        fflush(stderr);
 685                }
 686        }
 687
 688        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 689        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 690        curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 691
 692
 693        rpc->any_written = 0;
 694        err = run_slot(slot, NULL);
 695        if (err == HTTP_REAUTH && !large_request) {
 696                credential_fill(&http_auth);
 697                goto retry;
 698        }
 699        if (err != HTTP_OK)
 700                err = -1;
 701
 702        if (!rpc->any_written)
 703                err = -1;
 704
 705        curl_slist_free_all(headers);
 706        free(gzip_body);
 707        return err;
 708}
 709
 710static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 711{
 712        const char *svc = rpc->service_name;
 713        struct strbuf buf = STRBUF_INIT;
 714        struct strbuf *preamble = rpc->stdin_preamble;
 715        struct child_process client = CHILD_PROCESS_INIT;
 716        int err = 0;
 717
 718        client.in = -1;
 719        client.out = -1;
 720        client.git_cmd = 1;
 721        client.argv = rpc->argv;
 722        if (start_command(&client))
 723                exit(1);
 724        if (preamble)
 725                write_or_die(client.in, preamble->buf, preamble->len);
 726        if (heads)
 727                write_or_die(client.in, heads->buf, heads->len);
 728
 729        rpc->alloc = http_post_buffer;
 730        rpc->buf = xmalloc(rpc->alloc);
 731        rpc->in = client.in;
 732        rpc->out = client.out;
 733        strbuf_init(&rpc->result, 0);
 734
 735        strbuf_addf(&buf, "%s%s", url.buf, svc);
 736        rpc->service_url = strbuf_detach(&buf, NULL);
 737
 738        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 739        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 740
 741        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 742        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 743
 744        while (!err) {
 745                int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 746                if (!n)
 747                        break;
 748                rpc->pos = 0;
 749                rpc->len = n;
 750                err |= post_rpc(rpc);
 751        }
 752
 753        close(client.in);
 754        client.in = -1;
 755        if (!err) {
 756                strbuf_read(&rpc->result, client.out, 0);
 757        } else {
 758                char buf[4096];
 759                for (;;)
 760                        if (xread(client.out, buf, sizeof(buf)) <= 0)
 761                                break;
 762        }
 763
 764        close(client.out);
 765        client.out = -1;
 766
 767        err |= finish_command(&client);
 768        free(rpc->service_url);
 769        free(rpc->hdr_content_type);
 770        free(rpc->hdr_accept);
 771        free(rpc->buf);
 772        strbuf_release(&buf);
 773        return err;
 774}
 775
 776static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 777{
 778        struct walker *walker;
 779        char **targets;
 780        int ret, i;
 781
 782        ALLOC_ARRAY(targets, nr_heads);
 783        if (options.depth || options.deepen_since)
 784                die("dumb http transport does not support shallow capabilities");
 785        for (i = 0; i < nr_heads; i++)
 786                targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
 787
 788        walker = get_http_walker(url.buf);
 789        walker->get_all = 1;
 790        walker->get_tree = 1;
 791        walker->get_history = 1;
 792        walker->get_verbosely = options.verbosity >= 3;
 793        walker->get_recover = 0;
 794        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 795        walker_free(walker);
 796
 797        for (i = 0; i < nr_heads; i++)
 798                free(targets[i]);
 799        free(targets);
 800
 801        return ret ? error("fetch failed.") : 0;
 802}
 803
 804static int fetch_git(struct discovery *heads,
 805        int nr_heads, struct ref **to_fetch)
 806{
 807        struct rpc_state rpc;
 808        struct strbuf preamble = STRBUF_INIT;
 809        int i, err;
 810        struct argv_array args = ARGV_ARRAY_INIT;
 811
 812        argv_array_pushl(&args, "fetch-pack", "--stateless-rpc",
 813                         "--stdin", "--lock-pack", NULL);
 814        if (options.followtags)
 815                argv_array_push(&args, "--include-tag");
 816        if (options.thin)
 817                argv_array_push(&args, "--thin");
 818        if (options.verbosity >= 3)
 819                argv_array_pushl(&args, "-v", "-v", NULL);
 820        if (options.check_self_contained_and_connected)
 821                argv_array_push(&args, "--check-self-contained-and-connected");
 822        if (options.cloning)
 823                argv_array_push(&args, "--cloning");
 824        if (options.update_shallow)
 825                argv_array_push(&args, "--update-shallow");
 826        if (!options.progress)
 827                argv_array_push(&args, "--no-progress");
 828        if (options.depth)
 829                argv_array_pushf(&args, "--depth=%lu", options.depth);
 830        if (options.deepen_since)
 831                argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since);
 832        for (i = 0; i < options.deepen_not.nr; i++)
 833                argv_array_pushf(&args, "--shallow-exclude=%s",
 834                                 options.deepen_not.items[i].string);
 835        if (options.deepen_relative && options.depth)
 836                argv_array_push(&args, "--deepen-relative");
 837        if (options.from_promisor)
 838                argv_array_push(&args, "--from-promisor");
 839        if (options.no_dependents)
 840                argv_array_push(&args, "--no-dependents");
 841        if (options.filter)
 842                argv_array_pushf(&args, "--filter=%s", options.filter);
 843        argv_array_push(&args, url.buf);
 844
 845        for (i = 0; i < nr_heads; i++) {
 846                struct ref *ref = to_fetch[i];
 847                if (!*ref->name)
 848                        die("cannot fetch by sha1 over smart http");
 849                packet_buf_write(&preamble, "%s %s\n",
 850                                 oid_to_hex(&ref->old_oid), ref->name);
 851        }
 852        packet_buf_flush(&preamble);
 853
 854        memset(&rpc, 0, sizeof(rpc));
 855        rpc.service_name = "git-upload-pack",
 856        rpc.argv = args.argv;
 857        rpc.stdin_preamble = &preamble;
 858        rpc.gzip_request = 1;
 859
 860        err = rpc_service(&rpc, heads);
 861        if (rpc.result.len)
 862                write_or_die(1, rpc.result.buf, rpc.result.len);
 863        strbuf_release(&rpc.result);
 864        strbuf_release(&preamble);
 865        argv_array_clear(&args);
 866        return err;
 867}
 868
 869static int fetch(int nr_heads, struct ref **to_fetch)
 870{
 871        struct discovery *d = discover_refs("git-upload-pack", 0);
 872        if (d->proto_git)
 873                return fetch_git(d, nr_heads, to_fetch);
 874        else
 875                return fetch_dumb(nr_heads, to_fetch);
 876}
 877
 878static void parse_fetch(struct strbuf *buf)
 879{
 880        struct ref **to_fetch = NULL;
 881        struct ref *list_head = NULL;
 882        struct ref **list = &list_head;
 883        int alloc_heads = 0, nr_heads = 0;
 884
 885        do {
 886                const char *p;
 887                if (skip_prefix(buf->buf, "fetch ", &p)) {
 888                        const char *name;
 889                        struct ref *ref;
 890                        struct object_id old_oid;
 891
 892                        if (get_oid_hex(p, &old_oid))
 893                                die("protocol error: expected sha/ref, got %s'", p);
 894                        if (p[GIT_SHA1_HEXSZ] == ' ')
 895                                name = p + GIT_SHA1_HEXSZ + 1;
 896                        else if (!p[GIT_SHA1_HEXSZ])
 897                                name = "";
 898                        else
 899                                die("protocol error: expected sha/ref, got %s'", p);
 900
 901                        ref = alloc_ref(name);
 902                        oidcpy(&ref->old_oid, &old_oid);
 903
 904                        *list = ref;
 905                        list = &ref->next;
 906
 907                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 908                        to_fetch[nr_heads++] = ref;
 909                }
 910                else
 911                        die("http transport does not support %s", buf->buf);
 912
 913                strbuf_reset(buf);
 914                if (strbuf_getline_lf(buf, stdin) == EOF)
 915                        return;
 916                if (!*buf->buf)
 917                        break;
 918        } while (1);
 919
 920        if (fetch(nr_heads, to_fetch))
 921                exit(128); /* error already reported */
 922        free_refs(list_head);
 923        free(to_fetch);
 924
 925        printf("\n");
 926        fflush(stdout);
 927        strbuf_reset(buf);
 928}
 929
 930static int push_dav(int nr_spec, char **specs)
 931{
 932        struct child_process child = CHILD_PROCESS_INIT;
 933        size_t i;
 934
 935        child.git_cmd = 1;
 936        argv_array_push(&child.args, "http-push");
 937        argv_array_push(&child.args, "--helper-status");
 938        if (options.dry_run)
 939                argv_array_push(&child.args, "--dry-run");
 940        if (options.verbosity > 1)
 941                argv_array_push(&child.args, "--verbose");
 942        argv_array_push(&child.args, url.buf);
 943        for (i = 0; i < nr_spec; i++)
 944                argv_array_push(&child.args, specs[i]);
 945
 946        if (run_command(&child))
 947                die("git-http-push failed");
 948        return 0;
 949}
 950
 951static int push_git(struct discovery *heads, int nr_spec, char **specs)
 952{
 953        struct rpc_state rpc;
 954        int i, err;
 955        struct argv_array args;
 956        struct string_list_item *cas_option;
 957        struct strbuf preamble = STRBUF_INIT;
 958
 959        argv_array_init(&args);
 960        argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 961                         NULL);
 962
 963        if (options.thin)
 964                argv_array_push(&args, "--thin");
 965        if (options.dry_run)
 966                argv_array_push(&args, "--dry-run");
 967        if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
 968                argv_array_push(&args, "--signed=yes");
 969        else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
 970                argv_array_push(&args, "--signed=if-asked");
 971        if (options.verbosity == 0)
 972                argv_array_push(&args, "--quiet");
 973        else if (options.verbosity > 1)
 974                argv_array_push(&args, "--verbose");
 975        for (i = 0; i < options.push_options.nr; i++)
 976                argv_array_pushf(&args, "--push-option=%s",
 977                                 options.push_options.items[i].string);
 978        argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 979        for_each_string_list_item(cas_option, &cas_options)
 980                argv_array_push(&args, cas_option->string);
 981        argv_array_push(&args, url.buf);
 982
 983        argv_array_push(&args, "--stdin");
 984        for (i = 0; i < nr_spec; i++)
 985                packet_buf_write(&preamble, "%s\n", specs[i]);
 986        packet_buf_flush(&preamble);
 987
 988        memset(&rpc, 0, sizeof(rpc));
 989        rpc.service_name = "git-receive-pack",
 990        rpc.argv = args.argv;
 991        rpc.stdin_preamble = &preamble;
 992
 993        err = rpc_service(&rpc, heads);
 994        if (rpc.result.len)
 995                write_or_die(1, rpc.result.buf, rpc.result.len);
 996        strbuf_release(&rpc.result);
 997        strbuf_release(&preamble);
 998        argv_array_clear(&args);
 999        return err;
1000}
1001
1002static int push(int nr_spec, char **specs)
1003{
1004        struct discovery *heads = discover_refs("git-receive-pack", 1);
1005        int ret;
1006
1007        if (heads->proto_git)
1008                ret = push_git(heads, nr_spec, specs);
1009        else
1010                ret = push_dav(nr_spec, specs);
1011        free_discovery(heads);
1012        return ret;
1013}
1014
1015static void parse_push(struct strbuf *buf)
1016{
1017        char **specs = NULL;
1018        int alloc_spec = 0, nr_spec = 0, i, ret;
1019
1020        do {
1021                if (starts_with(buf->buf, "push ")) {
1022                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
1023                        specs[nr_spec++] = xstrdup(buf->buf + 5);
1024                }
1025                else
1026                        die("http transport does not support %s", buf->buf);
1027
1028                strbuf_reset(buf);
1029                if (strbuf_getline_lf(buf, stdin) == EOF)
1030                        goto free_specs;
1031                if (!*buf->buf)
1032                        break;
1033        } while (1);
1034
1035        ret = push(nr_spec, specs);
1036        printf("\n");
1037        fflush(stdout);
1038
1039        if (ret)
1040                exit(128); /* error already reported */
1041
1042 free_specs:
1043        for (i = 0; i < nr_spec; i++)
1044                free(specs[i]);
1045        free(specs);
1046}
1047
1048int cmd_main(int argc, const char **argv)
1049{
1050        struct strbuf buf = STRBUF_INIT;
1051        int nongit;
1052
1053        setup_git_directory_gently(&nongit);
1054        if (argc < 2) {
1055                error("remote-curl: usage: git remote-curl <remote> [<url>]");
1056                return 1;
1057        }
1058
1059        options.verbosity = 1;
1060        options.progress = !!isatty(2);
1061        options.thin = 1;
1062        string_list_init(&options.deepen_not, 1);
1063        string_list_init(&options.push_options, 1);
1064
1065        remote = remote_get(argv[1]);
1066
1067        if (argc > 2) {
1068                end_url_with_slash(&url, argv[2]);
1069        } else {
1070                end_url_with_slash(&url, remote->url[0]);
1071        }
1072
1073        http_init(remote, url.buf, 0);
1074
1075        do {
1076                const char *arg;
1077
1078                if (strbuf_getline_lf(&buf, stdin) == EOF) {
1079                        if (ferror(stdin))
1080                                error("remote-curl: error reading command stream from git");
1081                        return 1;
1082                }
1083                if (buf.len == 0)
1084                        break;
1085                if (starts_with(buf.buf, "fetch ")) {
1086                        if (nongit)
1087                                die("remote-curl: fetch attempted without a local repo");
1088                        parse_fetch(&buf);
1089
1090                } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1091                        int for_push = !!strstr(buf.buf + 4, "for-push");
1092                        output_refs(get_refs(for_push));
1093
1094                } else if (starts_with(buf.buf, "push ")) {
1095                        parse_push(&buf);
1096
1097                } else if (skip_prefix(buf.buf, "option ", &arg)) {
1098                        char *value = strchr(arg, ' ');
1099                        int result;
1100
1101                        if (value)
1102                                *value++ = '\0';
1103                        else
1104                                value = "true";
1105
1106                        result = set_option(arg, value);
1107                        if (!result)
1108                                printf("ok\n");
1109                        else if (result < 0)
1110                                printf("error invalid value\n");
1111                        else
1112                                printf("unsupported\n");
1113                        fflush(stdout);
1114
1115                } else if (!strcmp(buf.buf, "capabilities")) {
1116                        printf("fetch\n");
1117                        printf("option\n");
1118                        printf("push\n");
1119                        printf("check-connectivity\n");
1120                        printf("\n");
1121                        fflush(stdout);
1122                } else {
1123                        error("remote-curl: unknown command '%s' from git", buf.buf);
1124                        return 1;
1125                }
1126                strbuf_reset(&buf);
1127        } while (1);
1128
1129        http_cleanup();
1130
1131        return 0;
1132}