Andrew's git / gitweb.git / remote-curl.c
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remote-curl.con commit fetch: don't redundantly NULL something calloc() gave us (aa59e0e)
   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        unsigned progress : 1,
  28                check_self_contained_and_connected : 1,
  29                cloning : 1,
  30                update_shallow : 1,
  31                followtags : 1,
  32                dry_run : 1,
  33                thin : 1,
  34                /* One of the SEND_PACK_PUSH_CERT_* constants. */
  35                push_cert : 2,
  36                deepen_relative : 1;
  37};
  38static struct options options;
  39static struct string_list cas_options = STRING_LIST_INIT_DUP;
  40
  41static int set_option(const char *name, const char *value)
  42{
  43        if (!strcmp(name, "verbosity")) {
  44                char *end;
  45                int v = strtol(value, &end, 10);
  46                if (value == end || *end)
  47                        return -1;
  48                options.verbosity = v;
  49                return 0;
  50        }
  51        else if (!strcmp(name, "progress")) {
  52                if (!strcmp(value, "true"))
  53                        options.progress = 1;
  54                else if (!strcmp(value, "false"))
  55                        options.progress = 0;
  56                else
  57                        return -1;
  58                return 0;
  59        }
  60        else if (!strcmp(name, "depth")) {
  61                char *end;
  62                unsigned long v = strtoul(value, &end, 10);
  63                if (value == end || *end)
  64                        return -1;
  65                options.depth = v;
  66                return 0;
  67        }
  68        else if (!strcmp(name, "deepen-since")) {
  69                options.deepen_since = xstrdup(value);
  70                return 0;
  71        }
  72        else if (!strcmp(name, "deepen-not")) {
  73                string_list_append(&options.deepen_not, value);
  74                return 0;
  75        }
  76        else if (!strcmp(name, "deepen-relative")) {
  77                if (!strcmp(value, "true"))
  78                        options.deepen_relative = 1;
  79                else if (!strcmp(value, "false"))
  80                        options.deepen_relative = 0;
  81                else
  82                        return -1;
  83                return 0;
  84        }
  85        else if (!strcmp(name, "followtags")) {
  86                if (!strcmp(value, "true"))
  87                        options.followtags = 1;
  88                else if (!strcmp(value, "false"))
  89                        options.followtags = 0;
  90                else
  91                        return -1;
  92                return 0;
  93        }
  94        else if (!strcmp(name, "dry-run")) {
  95                if (!strcmp(value, "true"))
  96                        options.dry_run = 1;
  97                else if (!strcmp(value, "false"))
  98                        options.dry_run = 0;
  99                else
 100                        return -1;
 101                return 0;
 102        }
 103        else if (!strcmp(name, "check-connectivity")) {
 104                if (!strcmp(value, "true"))
 105                        options.check_self_contained_and_connected = 1;
 106                else if (!strcmp(value, "false"))
 107                        options.check_self_contained_and_connected = 0;
 108                else
 109                        return -1;
 110                return 0;
 111        }
 112        else if (!strcmp(name, "cas")) {
 113                struct strbuf val = STRBUF_INIT;
 114                strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
 115                string_list_append(&cas_options, val.buf);
 116                strbuf_release(&val);
 117                return 0;
 118        } else if (!strcmp(name, "cloning")) {
 119                if (!strcmp(value, "true"))
 120                        options.cloning = 1;
 121                else if (!strcmp(value, "false"))
 122                        options.cloning = 0;
 123                else
 124                        return -1;
 125                return 0;
 126        } else if (!strcmp(name, "update-shallow")) {
 127                if (!strcmp(value, "true"))
 128                        options.update_shallow = 1;
 129                else if (!strcmp(value, "false"))
 130                        options.update_shallow = 0;
 131                else
 132                        return -1;
 133                return 0;
 134        } else if (!strcmp(name, "pushcert")) {
 135                if (!strcmp(value, "true"))
 136                        options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 137                else if (!strcmp(value, "false"))
 138                        options.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 139                else if (!strcmp(value, "if-asked"))
 140                        options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 141                else
 142                        return -1;
 143                return 0;
 144        } else if (!strcmp(name, "push-option")) {
 145                string_list_append(&options.push_options, value);
 146                return 0;
 147
 148#if LIBCURL_VERSION_NUM >= 0x070a08
 149        } else if (!strcmp(name, "family")) {
 150                if (!strcmp(value, "ipv4"))
 151                        git_curl_ipresolve = CURL_IPRESOLVE_V4;
 152                else if (!strcmp(value, "ipv6"))
 153                        git_curl_ipresolve = CURL_IPRESOLVE_V6;
 154                else if (!strcmp(value, "all"))
 155                        git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
 156                else
 157                        return -1;
 158                return 0;
 159#endif /* LIBCURL_VERSION_NUM >= 0x070a08 */
 160        } else {
 161                return 1 /* unsupported */;
 162        }
 163}
 164
 165struct discovery {
 166        const char *service;
 167        char *buf_alloc;
 168        char *buf;
 169        size_t len;
 170        struct ref *refs;
 171        struct oid_array shallow;
 172        unsigned proto_git : 1;
 173};
 174static struct discovery *last_discovery;
 175
 176static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 177{
 178        struct ref *list = NULL;
 179        get_remote_heads(-1, heads->buf, heads->len, &list,
 180                         for_push ? REF_NORMAL : 0, NULL, &heads->shallow);
 181        return list;
 182}
 183
 184static struct ref *parse_info_refs(struct discovery *heads)
 185{
 186        char *data, *start, *mid;
 187        char *ref_name;
 188        int i = 0;
 189
 190        struct ref *refs = NULL;
 191        struct ref *ref = NULL;
 192        struct ref *last_ref = NULL;
 193
 194        data = heads->buf;
 195        start = NULL;
 196        mid = data;
 197        while (i < heads->len) {
 198                if (!start) {
 199                        start = &data[i];
 200                }
 201                if (data[i] == '\t')
 202                        mid = &data[i];
 203                if (data[i] == '\n') {
 204                        if (mid - start != 40)
 205                                die("%sinfo/refs not valid: is this a git repository?",
 206                                    url.buf);
 207                        data[i] = 0;
 208                        ref_name = mid + 1;
 209                        ref = alloc_ref(ref_name);
 210                        get_oid_hex(start, &ref->old_oid);
 211                        if (!refs)
 212                                refs = ref;
 213                        if (last_ref)
 214                                last_ref->next = ref;
 215                        last_ref = ref;
 216                        start = NULL;
 217                }
 218                i++;
 219        }
 220
 221        ref = alloc_ref("HEAD");
 222        if (!http_fetch_ref(url.buf, ref) &&
 223            !resolve_remote_symref(ref, refs)) {
 224                ref->next = refs;
 225                refs = ref;
 226        } else {
 227                free(ref);
 228        }
 229
 230        return refs;
 231}
 232
 233static void free_discovery(struct discovery *d)
 234{
 235        if (d) {
 236                if (d == last_discovery)
 237                        last_discovery = NULL;
 238                free(d->shallow.oid);
 239                free(d->buf_alloc);
 240                free_refs(d->refs);
 241                free(d);
 242        }
 243}
 244
 245static int show_http_message(struct strbuf *type, struct strbuf *charset,
 246                             struct strbuf *msg)
 247{
 248        const char *p, *eol;
 249
 250        /*
 251         * We only show text/plain parts, as other types are likely
 252         * to be ugly to look at on the user's terminal.
 253         */
 254        if (strcmp(type->buf, "text/plain"))
 255                return -1;
 256        if (charset->len)
 257                strbuf_reencode(msg, charset->buf, get_log_output_encoding());
 258
 259        strbuf_trim(msg);
 260        if (!msg->len)
 261                return -1;
 262
 263        p = msg->buf;
 264        do {
 265                eol = strchrnul(p, '\n');
 266                fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 267                p = eol + 1;
 268        } while(*eol);
 269        return 0;
 270}
 271
 272static struct discovery *discover_refs(const char *service, int for_push)
 273{
 274        struct strbuf exp = STRBUF_INIT;
 275        struct strbuf type = STRBUF_INIT;
 276        struct strbuf charset = STRBUF_INIT;
 277        struct strbuf buffer = STRBUF_INIT;
 278        struct strbuf refs_url = STRBUF_INIT;
 279        struct strbuf effective_url = STRBUF_INIT;
 280        struct discovery *last = last_discovery;
 281        int http_ret, maybe_smart = 0;
 282        struct http_get_options http_options;
 283
 284        if (last && !strcmp(service, last->service))
 285                return last;
 286        free_discovery(last);
 287
 288        strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 289        if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 290             git_env_bool("GIT_SMART_HTTP", 1)) {
 291                maybe_smart = 1;
 292                if (!strchr(url.buf, '?'))
 293                        strbuf_addch(&refs_url, '?');
 294                else
 295                        strbuf_addch(&refs_url, '&');
 296                strbuf_addf(&refs_url, "service=%s", service);
 297        }
 298
 299        memset(&http_options, 0, sizeof(http_options));
 300        http_options.content_type = &type;
 301        http_options.charset = &charset;
 302        http_options.effective_url = &effective_url;
 303        http_options.base_url = &url;
 304        http_options.initial_request = 1;
 305        http_options.no_cache = 1;
 306        http_options.keep_error = 1;
 307
 308        http_ret = http_get_strbuf(refs_url.buf, &buffer, &http_options);
 309        switch (http_ret) {
 310        case HTTP_OK:
 311                break;
 312        case HTTP_MISSING_TARGET:
 313                show_http_message(&type, &charset, &buffer);
 314                die("repository '%s' not found", url.buf);
 315        case HTTP_NOAUTH:
 316                show_http_message(&type, &charset, &buffer);
 317                die("Authentication failed for '%s'", url.buf);
 318        default:
 319                show_http_message(&type, &charset, &buffer);
 320                die("unable to access '%s': %s", url.buf, curl_errorstr);
 321        }
 322
 323        if (options.verbosity && !starts_with(refs_url.buf, url.buf))
 324                warning(_("redirecting to %s"), url.buf);
 325
 326        last= xcalloc(1, sizeof(*last_discovery));
 327        last->service = service;
 328        last->buf_alloc = strbuf_detach(&buffer, &last->len);
 329        last->buf = last->buf_alloc;
 330
 331        strbuf_addf(&exp, "application/x-%s-advertisement", service);
 332        if (maybe_smart &&
 333            (5 <= last->len && last->buf[4] == '#') &&
 334            !strbuf_cmp(&exp, &type)) {
 335                char *line;
 336
 337                /*
 338                 * smart HTTP response; validate that the service
 339                 * pkt-line matches our request.
 340                 */
 341                line = packet_read_line_buf(&last->buf, &last->len, NULL);
 342
 343                strbuf_reset(&exp);
 344                strbuf_addf(&exp, "# service=%s", service);
 345                if (strcmp(line, exp.buf))
 346                        die("invalid server response; got '%s'", line);
 347                strbuf_release(&exp);
 348
 349                /* The header can include additional metadata lines, up
 350                 * until a packet flush marker.  Ignore these now, but
 351                 * in the future we might start to scan them.
 352                 */
 353                while (packet_read_line_buf(&last->buf, &last->len, NULL))
 354                        ;
 355
 356                last->proto_git = 1;
 357        }
 358
 359        if (last->proto_git)
 360                last->refs = parse_git_refs(last, for_push);
 361        else
 362                last->refs = parse_info_refs(last);
 363
 364        strbuf_release(&refs_url);
 365        strbuf_release(&exp);
 366        strbuf_release(&type);
 367        strbuf_release(&charset);
 368        strbuf_release(&effective_url);
 369        strbuf_release(&buffer);
 370        last_discovery = last;
 371        return last;
 372}
 373
 374static struct ref *get_refs(int for_push)
 375{
 376        struct discovery *heads;
 377
 378        if (for_push)
 379                heads = discover_refs("git-receive-pack", for_push);
 380        else
 381                heads = discover_refs("git-upload-pack", for_push);
 382
 383        return heads->refs;
 384}
 385
 386static void output_refs(struct ref *refs)
 387{
 388        struct ref *posn;
 389        for (posn = refs; posn; posn = posn->next) {
 390                if (posn->symref)
 391                        printf("@%s %s\n", posn->symref, posn->name);
 392                else
 393                        printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name);
 394        }
 395        printf("\n");
 396        fflush(stdout);
 397}
 398
 399struct rpc_state {
 400        const char *service_name;
 401        const char **argv;
 402        struct strbuf *stdin_preamble;
 403        char *service_url;
 404        char *hdr_content_type;
 405        char *hdr_accept;
 406        char *buf;
 407        size_t alloc;
 408        size_t len;
 409        size_t pos;
 410        int in;
 411        int out;
 412        int any_written;
 413        struct strbuf result;
 414        unsigned gzip_request : 1;
 415        unsigned initial_buffer : 1;
 416};
 417
 418static size_t rpc_out(void *ptr, size_t eltsize,
 419                size_t nmemb, void *buffer_)
 420{
 421        size_t max = eltsize * nmemb;
 422        struct rpc_state *rpc = buffer_;
 423        size_t avail = rpc->len - rpc->pos;
 424
 425        if (!avail) {
 426                rpc->initial_buffer = 0;
 427                avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 428                if (!avail)
 429                        return 0;
 430                rpc->pos = 0;
 431                rpc->len = avail;
 432        }
 433
 434        if (max < avail)
 435                avail = max;
 436        memcpy(ptr, rpc->buf + rpc->pos, avail);
 437        rpc->pos += avail;
 438        return avail;
 439}
 440
 441#ifndef NO_CURL_IOCTL
 442static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 443{
 444        struct rpc_state *rpc = clientp;
 445
 446        switch (cmd) {
 447        case CURLIOCMD_NOP:
 448                return CURLIOE_OK;
 449
 450        case CURLIOCMD_RESTARTREAD:
 451                if (rpc->initial_buffer) {
 452                        rpc->pos = 0;
 453                        return CURLIOE_OK;
 454                }
 455                error("unable to rewind rpc post data - try increasing http.postBuffer");
 456                return CURLIOE_FAILRESTART;
 457
 458        default:
 459                return CURLIOE_UNKNOWNCMD;
 460        }
 461}
 462#endif
 463
 464static size_t rpc_in(char *ptr, size_t eltsize,
 465                size_t nmemb, void *buffer_)
 466{
 467        size_t size = eltsize * nmemb;
 468        struct rpc_state *rpc = buffer_;
 469        if (size)
 470                rpc->any_written = 1;
 471        write_or_die(rpc->in, ptr, size);
 472        return size;
 473}
 474
 475static int run_slot(struct active_request_slot *slot,
 476                    struct slot_results *results)
 477{
 478        int err;
 479        struct slot_results results_buf;
 480
 481        if (!results)
 482                results = &results_buf;
 483
 484        err = run_one_slot(slot, results);
 485
 486        if (err != HTTP_OK && err != HTTP_REAUTH) {
 487                struct strbuf msg = STRBUF_INIT;
 488                if (results->http_code && results->http_code != 200)
 489                        strbuf_addf(&msg, "HTTP %ld", results->http_code);
 490                if (results->curl_result != CURLE_OK) {
 491                        if (msg.len)
 492                                strbuf_addch(&msg, ' ');
 493                        strbuf_addf(&msg, "curl %d", results->curl_result);
 494                        if (curl_errorstr[0]) {
 495                                strbuf_addch(&msg, ' ');
 496                                strbuf_addstr(&msg, curl_errorstr);
 497                        }
 498                }
 499                error("RPC failed; %s", msg.buf);
 500                strbuf_release(&msg);
 501        }
 502
 503        return err;
 504}
 505
 506static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 507{
 508        struct active_request_slot *slot;
 509        struct curl_slist *headers = http_copy_default_headers();
 510        struct strbuf buf = STRBUF_INIT;
 511        int err;
 512
 513        slot = get_active_slot();
 514
 515        headers = curl_slist_append(headers, rpc->hdr_content_type);
 516        headers = curl_slist_append(headers, rpc->hdr_accept);
 517
 518        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 519        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 520        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 521        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 522        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 523        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 524        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 525        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 526        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 527
 528        err = run_slot(slot, results);
 529
 530        curl_slist_free_all(headers);
 531        strbuf_release(&buf);
 532        return err;
 533}
 534
 535static curl_off_t xcurl_off_t(ssize_t len) {
 536        if (len > maximum_signed_value_of_type(curl_off_t))
 537                die("cannot handle pushes this big");
 538        return (curl_off_t) len;
 539}
 540
 541static int post_rpc(struct rpc_state *rpc)
 542{
 543        struct active_request_slot *slot;
 544        struct curl_slist *headers = http_copy_default_headers();
 545        int use_gzip = rpc->gzip_request;
 546        char *gzip_body = NULL;
 547        size_t gzip_size = 0;
 548        int err, large_request = 0;
 549        int needs_100_continue = 0;
 550
 551        /* Try to load the entire request, if we can fit it into the
 552         * allocated buffer space we can use HTTP/1.0 and avoid the
 553         * chunked encoding mess.
 554         */
 555        while (1) {
 556                size_t left = rpc->alloc - rpc->len;
 557                char *buf = rpc->buf + rpc->len;
 558                int n;
 559
 560                if (left < LARGE_PACKET_MAX) {
 561                        large_request = 1;
 562                        use_gzip = 0;
 563                        break;
 564                }
 565
 566                n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 567                if (!n)
 568                        break;
 569                rpc->len += n;
 570        }
 571
 572        if (large_request) {
 573                struct slot_results results;
 574
 575                do {
 576                        err = probe_rpc(rpc, &results);
 577                        if (err == HTTP_REAUTH)
 578                                credential_fill(&http_auth);
 579                } while (err == HTTP_REAUTH);
 580                if (err != HTTP_OK)
 581                        return -1;
 582
 583                if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 584                        needs_100_continue = 1;
 585        }
 586
 587        headers = curl_slist_append(headers, rpc->hdr_content_type);
 588        headers = curl_slist_append(headers, rpc->hdr_accept);
 589        headers = curl_slist_append(headers, needs_100_continue ?
 590                "Expect: 100-continue" : "Expect:");
 591
 592retry:
 593        slot = get_active_slot();
 594
 595        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 596        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 597        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 598        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 599
 600        if (large_request) {
 601                /* The request body is large and the size cannot be predicted.
 602                 * We must use chunked encoding to send it.
 603                 */
 604                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 605                rpc->initial_buffer = 1;
 606                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 607                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 608#ifndef NO_CURL_IOCTL
 609                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 610                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 611#endif
 612                if (options.verbosity > 1) {
 613                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 614                        fflush(stderr);
 615                }
 616
 617        } else if (gzip_body) {
 618                /*
 619                 * If we are looping to retry authentication, then the previous
 620                 * run will have set up the headers and gzip buffer already,
 621                 * and we just need to send it.
 622                 */
 623                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 624                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 625
 626        } else if (use_gzip && 1024 < rpc->len) {
 627                /* The client backend isn't giving us compressed data so
 628                 * we can try to deflate it ourselves, this may save on.
 629                 * the transfer time.
 630                 */
 631                git_zstream stream;
 632                int ret;
 633
 634                git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 635                gzip_size = git_deflate_bound(&stream, rpc->len);
 636                gzip_body = xmalloc(gzip_size);
 637
 638                stream.next_in = (unsigned char *)rpc->buf;
 639                stream.avail_in = rpc->len;
 640                stream.next_out = (unsigned char *)gzip_body;
 641                stream.avail_out = gzip_size;
 642
 643                ret = git_deflate(&stream, Z_FINISH);
 644                if (ret != Z_STREAM_END)
 645                        die("cannot deflate request; zlib deflate error %d", ret);
 646
 647                ret = git_deflate_end_gently(&stream);
 648                if (ret != Z_OK)
 649                        die("cannot deflate request; zlib end error %d", ret);
 650
 651                gzip_size = stream.total_out;
 652
 653                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 654                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 655                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 656
 657                if (options.verbosity > 1) {
 658                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 659                                rpc->service_name,
 660                                (unsigned long)rpc->len, (unsigned long)gzip_size);
 661                        fflush(stderr);
 662                }
 663        } else {
 664                /* We know the complete request size in advance, use the
 665                 * more normal Content-Length approach.
 666                 */
 667                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 668                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(rpc->len));
 669                if (options.verbosity > 1) {
 670                        fprintf(stderr, "POST %s (%lu bytes)\n",
 671                                rpc->service_name, (unsigned long)rpc->len);
 672                        fflush(stderr);
 673                }
 674        }
 675
 676        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 677        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 678        curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 679
 680
 681        rpc->any_written = 0;
 682        err = run_slot(slot, NULL);
 683        if (err == HTTP_REAUTH && !large_request) {
 684                credential_fill(&http_auth);
 685                goto retry;
 686        }
 687        if (err != HTTP_OK)
 688                err = -1;
 689
 690        if (!rpc->any_written)
 691                err = -1;
 692
 693        curl_slist_free_all(headers);
 694        free(gzip_body);
 695        return err;
 696}
 697
 698static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 699{
 700        const char *svc = rpc->service_name;
 701        struct strbuf buf = STRBUF_INIT;
 702        struct strbuf *preamble = rpc->stdin_preamble;
 703        struct child_process client = CHILD_PROCESS_INIT;
 704        int err = 0;
 705
 706        client.in = -1;
 707        client.out = -1;
 708        client.git_cmd = 1;
 709        client.argv = rpc->argv;
 710        if (start_command(&client))
 711                exit(1);
 712        if (preamble)
 713                write_or_die(client.in, preamble->buf, preamble->len);
 714        if (heads)
 715                write_or_die(client.in, heads->buf, heads->len);
 716
 717        rpc->alloc = http_post_buffer;
 718        rpc->buf = xmalloc(rpc->alloc);
 719        rpc->in = client.in;
 720        rpc->out = client.out;
 721        strbuf_init(&rpc->result, 0);
 722
 723        strbuf_addf(&buf, "%s%s", url.buf, svc);
 724        rpc->service_url = strbuf_detach(&buf, NULL);
 725
 726        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 727        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 728
 729        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 730        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 731
 732        while (!err) {
 733                int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 734                if (!n)
 735                        break;
 736                rpc->pos = 0;
 737                rpc->len = n;
 738                err |= post_rpc(rpc);
 739        }
 740
 741        close(client.in);
 742        client.in = -1;
 743        if (!err) {
 744                strbuf_read(&rpc->result, client.out, 0);
 745        } else {
 746                char buf[4096];
 747                for (;;)
 748                        if (xread(client.out, buf, sizeof(buf)) <= 0)
 749                                break;
 750        }
 751
 752        close(client.out);
 753        client.out = -1;
 754
 755        err |= finish_command(&client);
 756        free(rpc->service_url);
 757        free(rpc->hdr_content_type);
 758        free(rpc->hdr_accept);
 759        free(rpc->buf);
 760        strbuf_release(&buf);
 761        return err;
 762}
 763
 764static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 765{
 766        struct walker *walker;
 767        char **targets;
 768        int ret, i;
 769
 770        ALLOC_ARRAY(targets, nr_heads);
 771        if (options.depth || options.deepen_since)
 772                die("dumb http transport does not support shallow capabilities");
 773        for (i = 0; i < nr_heads; i++)
 774                targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
 775
 776        walker = get_http_walker(url.buf);
 777        walker->get_all = 1;
 778        walker->get_tree = 1;
 779        walker->get_history = 1;
 780        walker->get_verbosely = options.verbosity >= 3;
 781        walker->get_recover = 0;
 782        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 783        walker_free(walker);
 784
 785        for (i = 0; i < nr_heads; i++)
 786                free(targets[i]);
 787        free(targets);
 788
 789        return ret ? error("fetch failed.") : 0;
 790}
 791
 792static int fetch_git(struct discovery *heads,
 793        int nr_heads, struct ref **to_fetch)
 794{
 795        struct rpc_state rpc;
 796        struct strbuf preamble = STRBUF_INIT;
 797        int i, err;
 798        struct argv_array args = ARGV_ARRAY_INIT;
 799
 800        argv_array_pushl(&args, "fetch-pack", "--stateless-rpc",
 801                         "--stdin", "--lock-pack", NULL);
 802        if (options.followtags)
 803                argv_array_push(&args, "--include-tag");
 804        if (options.thin)
 805                argv_array_push(&args, "--thin");
 806        if (options.verbosity >= 3)
 807                argv_array_pushl(&args, "-v", "-v", NULL);
 808        if (options.check_self_contained_and_connected)
 809                argv_array_push(&args, "--check-self-contained-and-connected");
 810        if (options.cloning)
 811                argv_array_push(&args, "--cloning");
 812        if (options.update_shallow)
 813                argv_array_push(&args, "--update-shallow");
 814        if (!options.progress)
 815                argv_array_push(&args, "--no-progress");
 816        if (options.depth)
 817                argv_array_pushf(&args, "--depth=%lu", options.depth);
 818        if (options.deepen_since)
 819                argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since);
 820        for (i = 0; i < options.deepen_not.nr; i++)
 821                argv_array_pushf(&args, "--shallow-exclude=%s",
 822                                 options.deepen_not.items[i].string);
 823        if (options.deepen_relative && options.depth)
 824                argv_array_push(&args, "--deepen-relative");
 825        argv_array_push(&args, url.buf);
 826
 827        for (i = 0; i < nr_heads; i++) {
 828                struct ref *ref = to_fetch[i];
 829                if (!*ref->name)
 830                        die("cannot fetch by sha1 over smart http");
 831                packet_buf_write(&preamble, "%s %s\n",
 832                                 oid_to_hex(&ref->old_oid), ref->name);
 833        }
 834        packet_buf_flush(&preamble);
 835
 836        memset(&rpc, 0, sizeof(rpc));
 837        rpc.service_name = "git-upload-pack",
 838        rpc.argv = args.argv;
 839        rpc.stdin_preamble = &preamble;
 840        rpc.gzip_request = 1;
 841
 842        err = rpc_service(&rpc, heads);
 843        if (rpc.result.len)
 844                write_or_die(1, rpc.result.buf, rpc.result.len);
 845        strbuf_release(&rpc.result);
 846        strbuf_release(&preamble);
 847        argv_array_clear(&args);
 848        return err;
 849}
 850
 851static int fetch(int nr_heads, struct ref **to_fetch)
 852{
 853        struct discovery *d = discover_refs("git-upload-pack", 0);
 854        if (d->proto_git)
 855                return fetch_git(d, nr_heads, to_fetch);
 856        else
 857                return fetch_dumb(nr_heads, to_fetch);
 858}
 859
 860static void parse_fetch(struct strbuf *buf)
 861{
 862        struct ref **to_fetch = NULL;
 863        struct ref *list_head = NULL;
 864        struct ref **list = &list_head;
 865        int alloc_heads = 0, nr_heads = 0;
 866
 867        do {
 868                const char *p;
 869                if (skip_prefix(buf->buf, "fetch ", &p)) {
 870                        const char *name;
 871                        struct ref *ref;
 872                        struct object_id old_oid;
 873
 874                        if (get_oid_hex(p, &old_oid))
 875                                die("protocol error: expected sha/ref, got %s'", p);
 876                        if (p[GIT_SHA1_HEXSZ] == ' ')
 877                                name = p + GIT_SHA1_HEXSZ + 1;
 878                        else if (!p[GIT_SHA1_HEXSZ])
 879                                name = "";
 880                        else
 881                                die("protocol error: expected sha/ref, got %s'", p);
 882
 883                        ref = alloc_ref(name);
 884                        oidcpy(&ref->old_oid, &old_oid);
 885
 886                        *list = ref;
 887                        list = &ref->next;
 888
 889                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 890                        to_fetch[nr_heads++] = ref;
 891                }
 892                else
 893                        die("http transport does not support %s", buf->buf);
 894
 895                strbuf_reset(buf);
 896                if (strbuf_getline_lf(buf, stdin) == EOF)
 897                        return;
 898                if (!*buf->buf)
 899                        break;
 900        } while (1);
 901
 902        if (fetch(nr_heads, to_fetch))
 903                exit(128); /* error already reported */
 904        free_refs(list_head);
 905        free(to_fetch);
 906
 907        printf("\n");
 908        fflush(stdout);
 909        strbuf_reset(buf);
 910}
 911
 912static int push_dav(int nr_spec, char **specs)
 913{
 914        struct child_process child = CHILD_PROCESS_INIT;
 915        size_t i;
 916
 917        child.git_cmd = 1;
 918        argv_array_push(&child.args, "http-push");
 919        argv_array_push(&child.args, "--helper-status");
 920        if (options.dry_run)
 921                argv_array_push(&child.args, "--dry-run");
 922        if (options.verbosity > 1)
 923                argv_array_push(&child.args, "--verbose");
 924        argv_array_push(&child.args, url.buf);
 925        for (i = 0; i < nr_spec; i++)
 926                argv_array_push(&child.args, specs[i]);
 927
 928        if (run_command(&child))
 929                die("git-http-push failed");
 930        return 0;
 931}
 932
 933static int push_git(struct discovery *heads, int nr_spec, char **specs)
 934{
 935        struct rpc_state rpc;
 936        int i, err;
 937        struct argv_array args;
 938        struct string_list_item *cas_option;
 939        struct strbuf preamble = STRBUF_INIT;
 940
 941        argv_array_init(&args);
 942        argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 943                         NULL);
 944
 945        if (options.thin)
 946                argv_array_push(&args, "--thin");
 947        if (options.dry_run)
 948                argv_array_push(&args, "--dry-run");
 949        if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
 950                argv_array_push(&args, "--signed=yes");
 951        else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
 952                argv_array_push(&args, "--signed=if-asked");
 953        if (options.verbosity == 0)
 954                argv_array_push(&args, "--quiet");
 955        else if (options.verbosity > 1)
 956                argv_array_push(&args, "--verbose");
 957        for (i = 0; i < options.push_options.nr; i++)
 958                argv_array_pushf(&args, "--push-option=%s",
 959                                 options.push_options.items[i].string);
 960        argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 961        for_each_string_list_item(cas_option, &cas_options)
 962                argv_array_push(&args, cas_option->string);
 963        argv_array_push(&args, url.buf);
 964
 965        argv_array_push(&args, "--stdin");
 966        for (i = 0; i < nr_spec; i++)
 967                packet_buf_write(&preamble, "%s\n", specs[i]);
 968        packet_buf_flush(&preamble);
 969
 970        memset(&rpc, 0, sizeof(rpc));
 971        rpc.service_name = "git-receive-pack",
 972        rpc.argv = args.argv;
 973        rpc.stdin_preamble = &preamble;
 974
 975        err = rpc_service(&rpc, heads);
 976        if (rpc.result.len)
 977                write_or_die(1, rpc.result.buf, rpc.result.len);
 978        strbuf_release(&rpc.result);
 979        strbuf_release(&preamble);
 980        argv_array_clear(&args);
 981        return err;
 982}
 983
 984static int push(int nr_spec, char **specs)
 985{
 986        struct discovery *heads = discover_refs("git-receive-pack", 1);
 987        int ret;
 988
 989        if (heads->proto_git)
 990                ret = push_git(heads, nr_spec, specs);
 991        else
 992                ret = push_dav(nr_spec, specs);
 993        free_discovery(heads);
 994        return ret;
 995}
 996
 997static void parse_push(struct strbuf *buf)
 998{
 999        char **specs = NULL;
1000        int alloc_spec = 0, nr_spec = 0, i, ret;
1001
1002        do {
1003                if (starts_with(buf->buf, "push ")) {
1004                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
1005                        specs[nr_spec++] = xstrdup(buf->buf + 5);
1006                }
1007                else
1008                        die("http transport does not support %s", buf->buf);
1009
1010                strbuf_reset(buf);
1011                if (strbuf_getline_lf(buf, stdin) == EOF)
1012                        goto free_specs;
1013                if (!*buf->buf)
1014                        break;
1015        } while (1);
1016
1017        ret = push(nr_spec, specs);
1018        printf("\n");
1019        fflush(stdout);
1020
1021        if (ret)
1022                exit(128); /* error already reported */
1023
1024 free_specs:
1025        for (i = 0; i < nr_spec; i++)
1026                free(specs[i]);
1027        free(specs);
1028}
1029
1030int cmd_main(int argc, const char **argv)
1031{
1032        struct strbuf buf = STRBUF_INIT;
1033        int nongit;
1034
1035        setup_git_directory_gently(&nongit);
1036        if (argc < 2) {
1037                error("remote-curl: usage: git remote-curl <remote> [<url>]");
1038                return 1;
1039        }
1040
1041        options.verbosity = 1;
1042        options.progress = !!isatty(2);
1043        options.thin = 1;
1044        string_list_init(&options.deepen_not, 1);
1045        string_list_init(&options.push_options, 1);
1046
1047        remote = remote_get(argv[1]);
1048
1049        if (argc > 2) {
1050                end_url_with_slash(&url, argv[2]);
1051        } else {
1052                end_url_with_slash(&url, remote->url[0]);
1053        }
1054
1055        http_init(remote, url.buf, 0);
1056
1057        do {
1058                const char *arg;
1059
1060                if (strbuf_getline_lf(&buf, stdin) == EOF) {
1061                        if (ferror(stdin))
1062                                error("remote-curl: error reading command stream from git");
1063                        return 1;
1064                }
1065                if (buf.len == 0)
1066                        break;
1067                if (starts_with(buf.buf, "fetch ")) {
1068                        if (nongit)
1069                                die("remote-curl: fetch attempted without a local repo");
1070                        parse_fetch(&buf);
1071
1072                } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1073                        int for_push = !!strstr(buf.buf + 4, "for-push");
1074                        output_refs(get_refs(for_push));
1075
1076                } else if (starts_with(buf.buf, "push ")) {
1077                        parse_push(&buf);
1078
1079                } else if (skip_prefix(buf.buf, "option ", &arg)) {
1080                        char *value = strchr(arg, ' ');
1081                        int result;
1082
1083                        if (value)
1084                                *value++ = '\0';
1085                        else
1086                                value = "true";
1087
1088                        result = set_option(arg, value);
1089                        if (!result)
1090                                printf("ok\n");
1091                        else if (result < 0)
1092                                printf("error invalid value\n");
1093                        else
1094                                printf("unsupported\n");
1095                        fflush(stdout);
1096
1097                } else if (!strcmp(buf.buf, "capabilities")) {
1098                        printf("fetch\n");
1099                        printf("option\n");
1100                        printf("push\n");
1101                        printf("check-connectivity\n");
1102                        printf("\n");
1103                        fflush(stdout);
1104                } else {
1105                        error("remote-curl: unknown command '%s' from git", buf.buf);
1106                        return 1;
1107                }
1108                strbuf_reset(&buf);
1109        } while (1);
1110
1111        http_cleanup();
1112
1113        return 0;
1114}