remote-curl.c

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