remote-curl.c

   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
  17 static struct remote *remote;
  18 /* always ends with a trailing slash */
  19 static struct strbuf url = STRBUF_INIT;
  20
  21 struct 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 };
  38 static struct options options;
  39 static struct string_list cas_options = STRING_LIST_INIT_DUP;
  40
  41 static 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
 165 struct 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 };
 174 static struct discovery *last_discovery;
 175
 176 static 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
 184 static 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
 233 static 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
 245 static 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
 272 static 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
 374 static 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
 386 static 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
 399 struct 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
 418 static 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
 442 static 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
 464 static 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
 475 static 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
 506 static 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
 535 static 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
 541 static 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
 592 retry:
 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
 698 static 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
 764 static 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
 792 static 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
 851 static 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
 860 static 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
 912 static 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
 933 static 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
 984 static 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
 997 static 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
1030 int 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 }