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         char *filter;
  28         unsigned progress : 1,
  29                 check_self_contained_and_connected : 1,
  30                 cloning : 1,
  31                 update_shallow : 1,
  32                 followtags : 1,
  33                 dry_run : 1,
  34                 thin : 1,
  35                 /* One of the SEND_PACK_PUSH_CERT_* constants. */
  36                 push_cert : 2,
  37                 deepen_relative : 1,
  38                 from_promisor : 1,
  39                 no_dependents : 1;
  40 };
  41 static struct options options;
  42 static struct string_list cas_options = STRING_LIST_INIT_DUP;
  43
  44 static int set_option(const char *name, const char *value)
  45 {
  46         if (!strcmp(name, "verbosity")) {
  47                 char *end;
  48                 int v = strtol(value, &end, 10);
  49                 if (value == end || *end)
  50                         return -1;
  51                 options.verbosity = v;
  52                 return 0;
  53         }
  54         else if (!strcmp(name, "progress")) {
  55                 if (!strcmp(value, "true"))
  56                         options.progress = 1;
  57                 else if (!strcmp(value, "false"))
  58                         options.progress = 0;
  59                 else
  60                         return -1;
  61                 return 0;
  62         }
  63         else if (!strcmp(name, "depth")) {
  64                 char *end;
  65                 unsigned long v = strtoul(value, &end, 10);
  66                 if (value == end || *end)
  67                         return -1;
  68                 options.depth = v;
  69                 return 0;
  70         }
  71         else if (!strcmp(name, "deepen-since")) {
  72                 options.deepen_since = xstrdup(value);
  73                 return 0;
  74         }
  75         else if (!strcmp(name, "deepen-not")) {
  76                 string_list_append(&options.deepen_not, value);
  77                 return 0;
  78         }
  79         else if (!strcmp(name, "deepen-relative")) {
  80                 if (!strcmp(value, "true"))
  81                         options.deepen_relative = 1;
  82                 else if (!strcmp(value, "false"))
  83                         options.deepen_relative = 0;
  84                 else
  85                         return -1;
  86                 return 0;
  87         }
  88         else if (!strcmp(name, "followtags")) {
  89                 if (!strcmp(value, "true"))
  90                         options.followtags = 1;
  91                 else if (!strcmp(value, "false"))
  92                         options.followtags = 0;
  93                 else
  94                         return -1;
  95                 return 0;
  96         }
  97         else if (!strcmp(name, "dry-run")) {
  98                 if (!strcmp(value, "true"))
  99                         options.dry_run = 1;
 100                 else if (!strcmp(value, "false"))
 101                         options.dry_run = 0;
 102                 else
 103                         return -1;
 104                 return 0;
 105         }
 106         else if (!strcmp(name, "check-connectivity")) {
 107                 if (!strcmp(value, "true"))
 108                         options.check_self_contained_and_connected = 1;
 109                 else if (!strcmp(value, "false"))
 110                         options.check_self_contained_and_connected = 0;
 111                 else
 112                         return -1;
 113                 return 0;
 114         }
 115         else if (!strcmp(name, "cas")) {
 116                 struct strbuf val = STRBUF_INIT;
 117                 strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
 118                 string_list_append(&cas_options, val.buf);
 119                 strbuf_release(&val);
 120                 return 0;
 121         } else if (!strcmp(name, "cloning")) {
 122                 if (!strcmp(value, "true"))
 123                         options.cloning = 1;
 124                 else if (!strcmp(value, "false"))
 125                         options.cloning = 0;
 126                 else
 127                         return -1;
 128                 return 0;
 129         } else if (!strcmp(name, "update-shallow")) {
 130                 if (!strcmp(value, "true"))
 131                         options.update_shallow = 1;
 132                 else if (!strcmp(value, "false"))
 133                         options.update_shallow = 0;
 134                 else
 135                         return -1;
 136                 return 0;
 137         } else if (!strcmp(name, "pushcert")) {
 138                 if (!strcmp(value, "true"))
 139                         options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 140                 else if (!strcmp(value, "false"))
 141                         options.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 142                 else if (!strcmp(value, "if-asked"))
 143                         options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 144                 else
 145                         return -1;
 146                 return 0;
 147         } else if (!strcmp(name, "push-option")) {
 148                 string_list_append(&options.push_options, value);
 149                 return 0;
 150
 151 #if LIBCURL_VERSION_NUM >= 0x070a08
 152         } else if (!strcmp(name, "family")) {
 153                 if (!strcmp(value, "ipv4"))
 154                         git_curl_ipresolve = CURL_IPRESOLVE_V4;
 155                 else if (!strcmp(value, "ipv6"))
 156                         git_curl_ipresolve = CURL_IPRESOLVE_V6;
 157                 else if (!strcmp(value, "all"))
 158                         git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
 159                 else
 160                         return -1;
 161                 return 0;
 162 #endif /* LIBCURL_VERSION_NUM >= 0x070a08 */
 163         } else if (!strcmp(name, "from-promisor")) {
 164                 options.from_promisor = 1;
 165                 return 0;
 166         } else if (!strcmp(name, "no-dependents")) {
 167                 options.no_dependents = 1;
 168                 return 0;
 169         } else if (!strcmp(name, "filter")) {
 170                 options.filter = xstrdup(value);;
 171                 return 0;
 172         } else {
 173                 return 1 /* unsupported */;
 174         }
 175 }
 176
 177 struct discovery {
 178         const char *service;
 179         char *buf_alloc;
 180         char *buf;
 181         size_t len;
 182         struct ref *refs;
 183         struct oid_array shallow;
 184         unsigned proto_git : 1;
 185 };
 186 static struct discovery *last_discovery;
 187
 188 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 189 {
 190         struct ref *list = NULL;
 191         get_remote_heads(-1, heads->buf, heads->len, &list,
 192                          for_push ? REF_NORMAL : 0, NULL, &heads->shallow);
 193         return list;
 194 }
 195
 196 static struct ref *parse_info_refs(struct discovery *heads)
 197 {
 198         char *data, *start, *mid;
 199         char *ref_name;
 200         int i = 0;
 201
 202         struct ref *refs = NULL;
 203         struct ref *ref = NULL;
 204         struct ref *last_ref = NULL;
 205
 206         data = heads->buf;
 207         start = NULL;
 208         mid = data;
 209         while (i < heads->len) {
 210                 if (!start) {
 211                         start = &data[i];
 212                 }
 213                 if (data[i] == '\t')
 214                         mid = &data[i];
 215                 if (data[i] == '\n') {
 216                         if (mid - start != 40)
 217                                 die("%sinfo/refs not valid: is this a git repository?",
 218                                     url.buf);
 219                         data[i] = 0;
 220                         ref_name = mid + 1;
 221                         ref = alloc_ref(ref_name);
 222                         get_oid_hex(start, &ref->old_oid);
 223                         if (!refs)
 224                                 refs = ref;
 225                         if (last_ref)
 226                                 last_ref->next = ref;
 227                         last_ref = ref;
 228                         start = NULL;
 229                 }
 230                 i++;
 231         }
 232
 233         ref = alloc_ref("HEAD");
 234         if (!http_fetch_ref(url.buf, ref) &&
 235             !resolve_remote_symref(ref, refs)) {
 236                 ref->next = refs;
 237                 refs = ref;
 238         } else {
 239                 free(ref);
 240         }
 241
 242         return refs;
 243 }
 244
 245 static void free_discovery(struct discovery *d)
 246 {
 247         if (d) {
 248                 if (d == last_discovery)
 249                         last_discovery = NULL;
 250                 free(d->shallow.oid);
 251                 free(d->buf_alloc);
 252                 free_refs(d->refs);
 253                 free(d);
 254         }
 255 }
 256
 257 static int show_http_message(struct strbuf *type, struct strbuf *charset,
 258                              struct strbuf *msg)
 259 {
 260         const char *p, *eol;
 261
 262         /*
 263          * We only show text/plain parts, as other types are likely
 264          * to be ugly to look at on the user's terminal.
 265          */
 266         if (strcmp(type->buf, "text/plain"))
 267                 return -1;
 268         if (charset->len)
 269                 strbuf_reencode(msg, charset->buf, get_log_output_encoding());
 270
 271         strbuf_trim(msg);
 272         if (!msg->len)
 273                 return -1;
 274
 275         p = msg->buf;
 276         do {
 277                 eol = strchrnul(p, '\n');
 278                 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 279                 p = eol + 1;
 280         } while(*eol);
 281         return 0;
 282 }
 283
 284 static struct discovery *discover_refs(const char *service, int for_push)
 285 {
 286         struct strbuf exp = STRBUF_INIT;
 287         struct strbuf type = STRBUF_INIT;
 288         struct strbuf charset = STRBUF_INIT;
 289         struct strbuf buffer = STRBUF_INIT;
 290         struct strbuf refs_url = STRBUF_INIT;
 291         struct strbuf effective_url = STRBUF_INIT;
 292         struct discovery *last = last_discovery;
 293         int http_ret, maybe_smart = 0;
 294         struct http_get_options http_options;
 295
 296         if (last && !strcmp(service, last->service))
 297                 return last;
 298         free_discovery(last);
 299
 300         strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 301         if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 302              git_env_bool("GIT_SMART_HTTP", 1)) {
 303                 maybe_smart = 1;
 304                 if (!strchr(url.buf, '?'))
 305                         strbuf_addch(&refs_url, '?');
 306                 else
 307                         strbuf_addch(&refs_url, '&');
 308                 strbuf_addf(&refs_url, "service=%s", service);
 309         }
 310
 311         memset(&http_options, 0, sizeof(http_options));
 312         http_options.content_type = &type;
 313         http_options.charset = &charset;
 314         http_options.effective_url = &effective_url;
 315         http_options.base_url = &url;
 316         http_options.initial_request = 1;
 317         http_options.no_cache = 1;
 318         http_options.keep_error = 1;
 319
 320         http_ret = http_get_strbuf(refs_url.buf, &buffer, &http_options);
 321         switch (http_ret) {
 322         case HTTP_OK:
 323                 break;
 324         case HTTP_MISSING_TARGET:
 325                 show_http_message(&type, &charset, &buffer);
 326                 die("repository '%s' not found", url.buf);
 327         case HTTP_NOAUTH:
 328                 show_http_message(&type, &charset, &buffer);
 329                 die("Authentication failed for '%s'", url.buf);
 330         default:
 331                 show_http_message(&type, &charset, &buffer);
 332                 die("unable to access '%s': %s", url.buf, curl_errorstr);
 333         }
 334
 335         if (options.verbosity && !starts_with(refs_url.buf, url.buf))
 336                 warning(_("redirecting to %s"), url.buf);
 337
 338         last= xcalloc(1, sizeof(*last_discovery));
 339         last->service = service;
 340         last->buf_alloc = strbuf_detach(&buffer, &last->len);
 341         last->buf = last->buf_alloc;
 342
 343         strbuf_addf(&exp, "application/x-%s-advertisement", service);
 344         if (maybe_smart &&
 345             (5 <= last->len && last->buf[4] == '#') &&
 346             !strbuf_cmp(&exp, &type)) {
 347                 char *line;
 348
 349                 /*
 350                  * smart HTTP response; validate that the service
 351                  * pkt-line matches our request.
 352                  */
 353                 line = packet_read_line_buf(&last->buf, &last->len, NULL);
 354                 if (!line)
 355                         die("invalid server response; expected service, got flush packet");
 356
 357                 strbuf_reset(&exp);
 358                 strbuf_addf(&exp, "# service=%s", service);
 359                 if (strcmp(line, exp.buf))
 360                         die("invalid server response; got '%s'", line);
 361                 strbuf_release(&exp);
 362
 363                 /* The header can include additional metadata lines, up
 364                  * until a packet flush marker.  Ignore these now, but
 365                  * in the future we might start to scan them.
 366                  */
 367                 while (packet_read_line_buf(&last->buf, &last->len, NULL))
 368                         ;
 369
 370                 last->proto_git = 1;
 371         }
 372
 373         if (last->proto_git)
 374                 last->refs = parse_git_refs(last, for_push);
 375         else
 376                 last->refs = parse_info_refs(last);
 377
 378         strbuf_release(&refs_url);
 379         strbuf_release(&exp);
 380         strbuf_release(&type);
 381         strbuf_release(&charset);
 382         strbuf_release(&effective_url);
 383         strbuf_release(&buffer);
 384         last_discovery = last;
 385         return last;
 386 }
 387
 388 static struct ref *get_refs(int for_push)
 389 {
 390         struct discovery *heads;
 391
 392         if (for_push)
 393                 heads = discover_refs("git-receive-pack", for_push);
 394         else
 395                 heads = discover_refs("git-upload-pack", for_push);
 396
 397         return heads->refs;
 398 }
 399
 400 static void output_refs(struct ref *refs)
 401 {
 402         struct ref *posn;
 403         for (posn = refs; posn; posn = posn->next) {
 404                 if (posn->symref)
 405                         printf("@%s %s\n", posn->symref, posn->name);
 406                 else
 407                         printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name);
 408         }
 409         printf("\n");
 410         fflush(stdout);
 411 }
 412
 413 struct rpc_state {
 414         const char *service_name;
 415         const char **argv;
 416         struct strbuf *stdin_preamble;
 417         char *service_url;
 418         char *hdr_content_type;
 419         char *hdr_accept;
 420         char *buf;
 421         size_t alloc;
 422         size_t len;
 423         size_t pos;
 424         int in;
 425         int out;
 426         int any_written;
 427         struct strbuf result;
 428         unsigned gzip_request : 1;
 429         unsigned initial_buffer : 1;
 430 };
 431
 432 static size_t rpc_out(void *ptr, size_t eltsize,
 433                 size_t nmemb, void *buffer_)
 434 {
 435         size_t max = eltsize * nmemb;
 436         struct rpc_state *rpc = buffer_;
 437         size_t avail = rpc->len - rpc->pos;
 438
 439         if (!avail) {
 440                 rpc->initial_buffer = 0;
 441                 avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 442                 if (!avail)
 443                         return 0;
 444                 rpc->pos = 0;
 445                 rpc->len = avail;
 446         }
 447
 448         if (max < avail)
 449                 avail = max;
 450         memcpy(ptr, rpc->buf + rpc->pos, avail);
 451         rpc->pos += avail;
 452         return avail;
 453 }
 454
 455 #ifndef NO_CURL_IOCTL
 456 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 457 {
 458         struct rpc_state *rpc = clientp;
 459
 460         switch (cmd) {
 461         case CURLIOCMD_NOP:
 462                 return CURLIOE_OK;
 463
 464         case CURLIOCMD_RESTARTREAD:
 465                 if (rpc->initial_buffer) {
 466                         rpc->pos = 0;
 467                         return CURLIOE_OK;
 468                 }
 469                 error("unable to rewind rpc post data - try increasing http.postBuffer");
 470                 return CURLIOE_FAILRESTART;
 471
 472         default:
 473                 return CURLIOE_UNKNOWNCMD;
 474         }
 475 }
 476 #endif
 477
 478 static size_t rpc_in(char *ptr, size_t eltsize,
 479                 size_t nmemb, void *buffer_)
 480 {
 481         size_t size = eltsize * nmemb;
 482         struct rpc_state *rpc = buffer_;
 483         if (size)
 484                 rpc->any_written = 1;
 485         write_or_die(rpc->in, ptr, size);
 486         return size;
 487 }
 488
 489 static int run_slot(struct active_request_slot *slot,
 490                     struct slot_results *results)
 491 {
 492         int err;
 493         struct slot_results results_buf;
 494
 495         if (!results)
 496                 results = &results_buf;
 497
 498         err = run_one_slot(slot, results);
 499
 500         if (err != HTTP_OK && err != HTTP_REAUTH) {
 501                 struct strbuf msg = STRBUF_INIT;
 502                 if (results->http_code && results->http_code != 200)
 503                         strbuf_addf(&msg, "HTTP %ld", results->http_code);
 504                 if (results->curl_result != CURLE_OK) {
 505                         if (msg.len)
 506                                 strbuf_addch(&msg, ' ');
 507                         strbuf_addf(&msg, "curl %d", results->curl_result);
 508                         if (curl_errorstr[0]) {
 509                                 strbuf_addch(&msg, ' ');
 510                                 strbuf_addstr(&msg, curl_errorstr);
 511                         }
 512                 }
 513                 error("RPC failed; %s", msg.buf);
 514                 strbuf_release(&msg);
 515         }
 516
 517         return err;
 518 }
 519
 520 static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 521 {
 522         struct active_request_slot *slot;
 523         struct curl_slist *headers = http_copy_default_headers();
 524         struct strbuf buf = STRBUF_INIT;
 525         int err;
 526
 527         slot = get_active_slot();
 528
 529         headers = curl_slist_append(headers, rpc->hdr_content_type);
 530         headers = curl_slist_append(headers, rpc->hdr_accept);
 531
 532         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 533         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 534         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 535         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 536         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 537         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 538         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 539         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 540         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 541
 542         err = run_slot(slot, results);
 543
 544         curl_slist_free_all(headers);
 545         strbuf_release(&buf);
 546         return err;
 547 }
 548
 549 static curl_off_t xcurl_off_t(ssize_t len) {
 550         if (len > maximum_signed_value_of_type(curl_off_t))
 551                 die("cannot handle pushes this big");
 552         return (curl_off_t) len;
 553 }
 554
 555 static int post_rpc(struct rpc_state *rpc)
 556 {
 557         struct active_request_slot *slot;
 558         struct curl_slist *headers = http_copy_default_headers();
 559         int use_gzip = rpc->gzip_request;
 560         char *gzip_body = NULL;
 561         size_t gzip_size = 0;
 562         int err, large_request = 0;
 563         int needs_100_continue = 0;
 564
 565         /* Try to load the entire request, if we can fit it into the
 566          * allocated buffer space we can use HTTP/1.0 and avoid the
 567          * chunked encoding mess.
 568          */
 569         while (1) {
 570                 size_t left = rpc->alloc - rpc->len;
 571                 char *buf = rpc->buf + rpc->len;
 572                 int n;
 573
 574                 if (left < LARGE_PACKET_MAX) {
 575                         large_request = 1;
 576                         use_gzip = 0;
 577                         break;
 578                 }
 579
 580                 n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 581                 if (!n)
 582                         break;
 583                 rpc->len += n;
 584         }
 585
 586         if (large_request) {
 587                 struct slot_results results;
 588
 589                 do {
 590                         err = probe_rpc(rpc, &results);
 591                         if (err == HTTP_REAUTH)
 592                                 credential_fill(&http_auth);
 593                 } while (err == HTTP_REAUTH);
 594                 if (err != HTTP_OK)
 595                         return -1;
 596
 597                 if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 598                         needs_100_continue = 1;
 599         }
 600
 601         headers = curl_slist_append(headers, rpc->hdr_content_type);
 602         headers = curl_slist_append(headers, rpc->hdr_accept);
 603         headers = curl_slist_append(headers, needs_100_continue ?
 604                 "Expect: 100-continue" : "Expect:");
 605
 606 retry:
 607         slot = get_active_slot();
 608
 609         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 610         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 611         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 612         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 613
 614         if (large_request) {
 615                 /* The request body is large and the size cannot be predicted.
 616                  * We must use chunked encoding to send it.
 617                  */
 618                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 619                 rpc->initial_buffer = 1;
 620                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 621                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 622 #ifndef NO_CURL_IOCTL
 623                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 624                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 625 #endif
 626                 if (options.verbosity > 1) {
 627                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 628                         fflush(stderr);
 629                 }
 630
 631         } else if (gzip_body) {
 632                 /*
 633                  * If we are looping to retry authentication, then the previous
 634                  * run will have set up the headers and gzip buffer already,
 635                  * and we just need to send it.
 636                  */
 637                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 638                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 639
 640         } else if (use_gzip && 1024 < rpc->len) {
 641                 /* The client backend isn't giving us compressed data so
 642                  * we can try to deflate it ourselves, this may save on.
 643                  * the transfer time.
 644                  */
 645                 git_zstream stream;
 646                 int ret;
 647
 648                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 649                 gzip_size = git_deflate_bound(&stream, rpc->len);
 650                 gzip_body = xmalloc(gzip_size);
 651
 652                 stream.next_in = (unsigned char *)rpc->buf;
 653                 stream.avail_in = rpc->len;
 654                 stream.next_out = (unsigned char *)gzip_body;
 655                 stream.avail_out = gzip_size;
 656
 657                 ret = git_deflate(&stream, Z_FINISH);
 658                 if (ret != Z_STREAM_END)
 659                         die("cannot deflate request; zlib deflate error %d", ret);
 660
 661                 ret = git_deflate_end_gently(&stream);
 662                 if (ret != Z_OK)
 663                         die("cannot deflate request; zlib end error %d", ret);
 664
 665                 gzip_size = stream.total_out;
 666
 667                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 668                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 669                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 670
 671                 if (options.verbosity > 1) {
 672                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 673                                 rpc->service_name,
 674                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
 675                         fflush(stderr);
 676                 }
 677         } else {
 678                 /* We know the complete request size in advance, use the
 679                  * more normal Content-Length approach.
 680                  */
 681                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 682                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(rpc->len));
 683                 if (options.verbosity > 1) {
 684                         fprintf(stderr, "POST %s (%lu bytes)\n",
 685                                 rpc->service_name, (unsigned long)rpc->len);
 686                         fflush(stderr);
 687                 }
 688         }
 689
 690         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 691         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 692         curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 693
 694
 695         rpc->any_written = 0;
 696         err = run_slot(slot, NULL);
 697         if (err == HTTP_REAUTH && !large_request) {
 698                 credential_fill(&http_auth);
 699                 goto retry;
 700         }
 701         if (err != HTTP_OK)
 702                 err = -1;
 703
 704         if (!rpc->any_written)
 705                 err = -1;
 706
 707         curl_slist_free_all(headers);
 708         free(gzip_body);
 709         return err;
 710 }
 711
 712 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 713 {
 714         const char *svc = rpc->service_name;
 715         struct strbuf buf = STRBUF_INIT;
 716         struct strbuf *preamble = rpc->stdin_preamble;
 717         struct child_process client = CHILD_PROCESS_INIT;
 718         int err = 0;
 719
 720         client.in = -1;
 721         client.out = -1;
 722         client.git_cmd = 1;
 723         client.argv = rpc->argv;
 724         if (start_command(&client))
 725                 exit(1);
 726         if (preamble)
 727                 write_or_die(client.in, preamble->buf, preamble->len);
 728         if (heads)
 729                 write_or_die(client.in, heads->buf, heads->len);
 730
 731         rpc->alloc = http_post_buffer;
 732         rpc->buf = xmalloc(rpc->alloc);
 733         rpc->in = client.in;
 734         rpc->out = client.out;
 735         strbuf_init(&rpc->result, 0);
 736
 737         strbuf_addf(&buf, "%s%s", url.buf, svc);
 738         rpc->service_url = strbuf_detach(&buf, NULL);
 739
 740         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 741         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 742
 743         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 744         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 745
 746         while (!err) {
 747                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 748                 if (!n)
 749                         break;
 750                 rpc->pos = 0;
 751                 rpc->len = n;
 752                 err |= post_rpc(rpc);
 753         }
 754
 755         close(client.in);
 756         client.in = -1;
 757         if (!err) {
 758                 strbuf_read(&rpc->result, client.out, 0);
 759         } else {
 760                 char buf[4096];
 761                 for (;;)
 762                         if (xread(client.out, buf, sizeof(buf)) <= 0)
 763                                 break;
 764         }
 765
 766         close(client.out);
 767         client.out = -1;
 768
 769         err |= finish_command(&client);
 770         free(rpc->service_url);
 771         free(rpc->hdr_content_type);
 772         free(rpc->hdr_accept);
 773         free(rpc->buf);
 774         strbuf_release(&buf);
 775         return err;
 776 }
 777
 778 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 779 {
 780         struct walker *walker;
 781         char **targets;
 782         int ret, i;
 783
 784         ALLOC_ARRAY(targets, nr_heads);
 785         if (options.depth || options.deepen_since)
 786                 die("dumb http transport does not support shallow capabilities");
 787         for (i = 0; i < nr_heads; i++)
 788                 targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
 789
 790         walker = get_http_walker(url.buf);
 791         walker->get_all = 1;
 792         walker->get_tree = 1;
 793         walker->get_history = 1;
 794         walker->get_verbosely = options.verbosity >= 3;
 795         walker->get_recover = 0;
 796         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 797         walker_free(walker);
 798
 799         for (i = 0; i < nr_heads; i++)
 800                 free(targets[i]);
 801         free(targets);
 802
 803         return ret ? error("fetch failed.") : 0;
 804 }
 805
 806 static int fetch_git(struct discovery *heads,
 807         int nr_heads, struct ref **to_fetch)
 808 {
 809         struct rpc_state rpc;
 810         struct strbuf preamble = STRBUF_INIT;
 811         int i, err;
 812         struct argv_array args = ARGV_ARRAY_INIT;
 813
 814         argv_array_pushl(&args, "fetch-pack", "--stateless-rpc",
 815                          "--stdin", "--lock-pack", NULL);
 816         if (options.followtags)
 817                 argv_array_push(&args, "--include-tag");
 818         if (options.thin)
 819                 argv_array_push(&args, "--thin");
 820         if (options.verbosity >= 3)
 821                 argv_array_pushl(&args, "-v", "-v", NULL);
 822         if (options.check_self_contained_and_connected)
 823                 argv_array_push(&args, "--check-self-contained-and-connected");
 824         if (options.cloning)
 825                 argv_array_push(&args, "--cloning");
 826         if (options.update_shallow)
 827                 argv_array_push(&args, "--update-shallow");
 828         if (!options.progress)
 829                 argv_array_push(&args, "--no-progress");
 830         if (options.depth)
 831                 argv_array_pushf(&args, "--depth=%lu", options.depth);
 832         if (options.deepen_since)
 833                 argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since);
 834         for (i = 0; i < options.deepen_not.nr; i++)
 835                 argv_array_pushf(&args, "--shallow-exclude=%s",
 836                                  options.deepen_not.items[i].string);
 837         if (options.deepen_relative && options.depth)
 838                 argv_array_push(&args, "--deepen-relative");
 839         if (options.from_promisor)
 840                 argv_array_push(&args, "--from-promisor");
 841         if (options.no_dependents)
 842                 argv_array_push(&args, "--no-dependents");
 843         if (options.filter)
 844                 argv_array_pushf(&args, "--filter=%s", options.filter);
 845         argv_array_push(&args, url.buf);
 846
 847         for (i = 0; i < nr_heads; i++) {
 848                 struct ref *ref = to_fetch[i];
 849                 if (!*ref->name)
 850                         die("cannot fetch by sha1 over smart http");
 851                 packet_buf_write(&preamble, "%s %s\n",
 852                                  oid_to_hex(&ref->old_oid), ref->name);
 853         }
 854         packet_buf_flush(&preamble);
 855
 856         memset(&rpc, 0, sizeof(rpc));
 857         rpc.service_name = "git-upload-pack",
 858         rpc.argv = args.argv;
 859         rpc.stdin_preamble = &preamble;
 860         rpc.gzip_request = 1;
 861
 862         err = rpc_service(&rpc, heads);
 863         if (rpc.result.len)
 864                 write_or_die(1, rpc.result.buf, rpc.result.len);
 865         strbuf_release(&rpc.result);
 866         strbuf_release(&preamble);
 867         argv_array_clear(&args);
 868         return err;
 869 }
 870
 871 static int fetch(int nr_heads, struct ref **to_fetch)
 872 {
 873         struct discovery *d = discover_refs("git-upload-pack", 0);
 874         if (d->proto_git)
 875                 return fetch_git(d, nr_heads, to_fetch);
 876         else
 877                 return fetch_dumb(nr_heads, to_fetch);
 878 }
 879
 880 static void parse_fetch(struct strbuf *buf)
 881 {
 882         struct ref **to_fetch = NULL;
 883         struct ref *list_head = NULL;
 884         struct ref **list = &list_head;
 885         int alloc_heads = 0, nr_heads = 0;
 886
 887         do {
 888                 const char *p;
 889                 if (skip_prefix(buf->buf, "fetch ", &p)) {
 890                         const char *name;
 891                         struct ref *ref;
 892                         struct object_id old_oid;
 893
 894                         if (get_oid_hex(p, &old_oid))
 895                                 die("protocol error: expected sha/ref, got %s'", p);
 896                         if (p[GIT_SHA1_HEXSZ] == ' ')
 897                                 name = p + GIT_SHA1_HEXSZ + 1;
 898                         else if (!p[GIT_SHA1_HEXSZ])
 899                                 name = "";
 900                         else
 901                                 die("protocol error: expected sha/ref, got %s'", p);
 902
 903                         ref = alloc_ref(name);
 904                         oidcpy(&ref->old_oid, &old_oid);
 905
 906                         *list = ref;
 907                         list = &ref->next;
 908
 909                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 910                         to_fetch[nr_heads++] = ref;
 911                 }
 912                 else
 913                         die("http transport does not support %s", buf->buf);
 914
 915                 strbuf_reset(buf);
 916                 if (strbuf_getline_lf(buf, stdin) == EOF)
 917                         return;
 918                 if (!*buf->buf)
 919                         break;
 920         } while (1);
 921
 922         if (fetch(nr_heads, to_fetch))
 923                 exit(128); /* error already reported */
 924         free_refs(list_head);
 925         free(to_fetch);
 926
 927         printf("\n");
 928         fflush(stdout);
 929         strbuf_reset(buf);
 930 }
 931
 932 static int push_dav(int nr_spec, char **specs)
 933 {
 934         struct child_process child = CHILD_PROCESS_INIT;
 935         size_t i;
 936
 937         child.git_cmd = 1;
 938         argv_array_push(&child.args, "http-push");
 939         argv_array_push(&child.args, "--helper-status");
 940         if (options.dry_run)
 941                 argv_array_push(&child.args, "--dry-run");
 942         if (options.verbosity > 1)
 943                 argv_array_push(&child.args, "--verbose");
 944         argv_array_push(&child.args, url.buf);
 945         for (i = 0; i < nr_spec; i++)
 946                 argv_array_push(&child.args, specs[i]);
 947
 948         if (run_command(&child))
 949                 die("git-http-push failed");
 950         return 0;
 951 }
 952
 953 static int push_git(struct discovery *heads, int nr_spec, char **specs)
 954 {
 955         struct rpc_state rpc;
 956         int i, err;
 957         struct argv_array args;
 958         struct string_list_item *cas_option;
 959         struct strbuf preamble = STRBUF_INIT;
 960
 961         argv_array_init(&args);
 962         argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 963                          NULL);
 964
 965         if (options.thin)
 966                 argv_array_push(&args, "--thin");
 967         if (options.dry_run)
 968                 argv_array_push(&args, "--dry-run");
 969         if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
 970                 argv_array_push(&args, "--signed=yes");
 971         else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
 972                 argv_array_push(&args, "--signed=if-asked");
 973         if (options.verbosity == 0)
 974                 argv_array_push(&args, "--quiet");
 975         else if (options.verbosity > 1)
 976                 argv_array_push(&args, "--verbose");
 977         for (i = 0; i < options.push_options.nr; i++)
 978                 argv_array_pushf(&args, "--push-option=%s",
 979                                  options.push_options.items[i].string);
 980         argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 981         for_each_string_list_item(cas_option, &cas_options)
 982                 argv_array_push(&args, cas_option->string);
 983         argv_array_push(&args, url.buf);
 984
 985         argv_array_push(&args, "--stdin");
 986         for (i = 0; i < nr_spec; i++)
 987                 packet_buf_write(&preamble, "%s\n", specs[i]);
 988         packet_buf_flush(&preamble);
 989
 990         memset(&rpc, 0, sizeof(rpc));
 991         rpc.service_name = "git-receive-pack",
 992         rpc.argv = args.argv;
 993         rpc.stdin_preamble = &preamble;
 994
 995         err = rpc_service(&rpc, heads);
 996         if (rpc.result.len)
 997                 write_or_die(1, rpc.result.buf, rpc.result.len);
 998         strbuf_release(&rpc.result);
 999         strbuf_release(&preamble);
1000         argv_array_clear(&args);
1001         return err;
1002 }
1003
1004 static int push(int nr_spec, char **specs)
1005 {
1006         struct discovery *heads = discover_refs("git-receive-pack", 1);
1007         int ret;
1008
1009         if (heads->proto_git)
1010                 ret = push_git(heads, nr_spec, specs);
1011         else
1012                 ret = push_dav(nr_spec, specs);
1013         free_discovery(heads);
1014         return ret;
1015 }
1016
1017 static void parse_push(struct strbuf *buf)
1018 {
1019         char **specs = NULL;
1020         int alloc_spec = 0, nr_spec = 0, i, ret;
1021
1022         do {
1023                 if (starts_with(buf->buf, "push ")) {
1024                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
1025                         specs[nr_spec++] = xstrdup(buf->buf + 5);
1026                 }
1027                 else
1028                         die("http transport does not support %s", buf->buf);
1029
1030                 strbuf_reset(buf);
1031                 if (strbuf_getline_lf(buf, stdin) == EOF)
1032                         goto free_specs;
1033                 if (!*buf->buf)
1034                         break;
1035         } while (1);
1036
1037         ret = push(nr_spec, specs);
1038         printf("\n");
1039         fflush(stdout);
1040
1041         if (ret)
1042                 exit(128); /* error already reported */
1043
1044  free_specs:
1045         for (i = 0; i < nr_spec; i++)
1046                 free(specs[i]);
1047         free(specs);
1048 }
1049
1050 int cmd_main(int argc, const char **argv)
1051 {
1052         struct strbuf buf = STRBUF_INIT;
1053         int nongit;
1054
1055         setup_git_directory_gently(&nongit);
1056         if (argc < 2) {
1057                 error("remote-curl: usage: git remote-curl <remote> [<url>]");
1058                 return 1;
1059         }
1060
1061         options.verbosity = 1;
1062         options.progress = !!isatty(2);
1063         options.thin = 1;
1064         string_list_init(&options.deepen_not, 1);
1065         string_list_init(&options.push_options, 1);
1066
1067         remote = remote_get(argv[1]);
1068
1069         if (argc > 2) {
1070                 end_url_with_slash(&url, argv[2]);
1071         } else {
1072                 end_url_with_slash(&url, remote->url[0]);
1073         }
1074
1075         http_init(remote, url.buf, 0);
1076
1077         do {
1078                 const char *arg;
1079
1080                 if (strbuf_getline_lf(&buf, stdin) == EOF) {
1081                         if (ferror(stdin))
1082                                 error("remote-curl: error reading command stream from git");
1083                         return 1;
1084                 }
1085                 if (buf.len == 0)
1086                         break;
1087                 if (starts_with(buf.buf, "fetch ")) {
1088                         if (nongit)
1089                                 die("remote-curl: fetch attempted without a local repo");
1090                         parse_fetch(&buf);
1091
1092                 } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1093                         int for_push = !!strstr(buf.buf + 4, "for-push");
1094                         output_refs(get_refs(for_push));
1095
1096                 } else if (starts_with(buf.buf, "push ")) {
1097                         parse_push(&buf);
1098
1099                 } else if (skip_prefix(buf.buf, "option ", &arg)) {
1100                         char *value = strchr(arg, ' ');
1101                         int result;
1102
1103                         if (value)
1104                                 *value++ = '\0';
1105                         else
1106                                 value = "true";
1107
1108                         result = set_option(arg, value);
1109                         if (!result)
1110                                 printf("ok\n");
1111                         else if (result < 0)
1112                                 printf("error invalid value\n");
1113                         else
1114                                 printf("unsupported\n");
1115                         fflush(stdout);
1116
1117                 } else if (!strcmp(buf.buf, "capabilities")) {
1118                         printf("fetch\n");
1119                         printf("option\n");
1120                         printf("push\n");
1121                         printf("check-connectivity\n");
1122                         printf("\n");
1123                         fflush(stdout);
1124                 } else {
1125                         error("remote-curl: unknown command '%s' from git", buf.buf);
1126                         return 1;
1127                 }
1128                 strbuf_reset(&buf);
1129         } while (1);
1130
1131         http_cleanup();
1132
1133         return 0;
1134 }