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 #include "quote.h"
  17
  18 static struct remote *remote;
  19 /* always ends with a trailing slash */
  20 static struct strbuf url = STRBUF_INIT;
  21
  22 struct options {
  23         int verbosity;
  24         unsigned long depth;
  25         char *deepen_since;
  26         struct string_list deepen_not;
  27         struct string_list push_options;
  28         char *filter;
  29         unsigned progress : 1,
  30                 check_self_contained_and_connected : 1,
  31                 cloning : 1,
  32                 update_shallow : 1,
  33                 followtags : 1,
  34                 dry_run : 1,
  35                 thin : 1,
  36                 /* One of the SEND_PACK_PUSH_CERT_* constants. */
  37                 push_cert : 2,
  38                 deepen_relative : 1,
  39                 from_promisor : 1,
  40                 no_dependents : 1;
  41 };
  42 static struct options options;
  43 static struct string_list cas_options = STRING_LIST_INIT_DUP;
  44
  45 static int set_option(const char *name, const char *value)
  46 {
  47         if (!strcmp(name, "verbosity")) {
  48                 char *end;
  49                 int v = strtol(value, &end, 10);
  50                 if (value == end || *end)
  51                         return -1;
  52                 options.verbosity = v;
  53                 return 0;
  54         }
  55         else if (!strcmp(name, "progress")) {
  56                 if (!strcmp(value, "true"))
  57                         options.progress = 1;
  58                 else if (!strcmp(value, "false"))
  59                         options.progress = 0;
  60                 else
  61                         return -1;
  62                 return 0;
  63         }
  64         else if (!strcmp(name, "depth")) {
  65                 char *end;
  66                 unsigned long v = strtoul(value, &end, 10);
  67                 if (value == end || *end)
  68                         return -1;
  69                 options.depth = v;
  70                 return 0;
  71         }
  72         else if (!strcmp(name, "deepen-since")) {
  73                 options.deepen_since = xstrdup(value);
  74                 return 0;
  75         }
  76         else if (!strcmp(name, "deepen-not")) {
  77                 string_list_append(&options.deepen_not, value);
  78                 return 0;
  79         }
  80         else if (!strcmp(name, "deepen-relative")) {
  81                 if (!strcmp(value, "true"))
  82                         options.deepen_relative = 1;
  83                 else if (!strcmp(value, "false"))
  84                         options.deepen_relative = 0;
  85                 else
  86                         return -1;
  87                 return 0;
  88         }
  89         else if (!strcmp(name, "followtags")) {
  90                 if (!strcmp(value, "true"))
  91                         options.followtags = 1;
  92                 else if (!strcmp(value, "false"))
  93                         options.followtags = 0;
  94                 else
  95                         return -1;
  96                 return 0;
  97         }
  98         else if (!strcmp(name, "dry-run")) {
  99                 if (!strcmp(value, "true"))
 100                         options.dry_run = 1;
 101                 else if (!strcmp(value, "false"))
 102                         options.dry_run = 0;
 103                 else
 104                         return -1;
 105                 return 0;
 106         }
 107         else if (!strcmp(name, "check-connectivity")) {
 108                 if (!strcmp(value, "true"))
 109                         options.check_self_contained_and_connected = 1;
 110                 else if (!strcmp(value, "false"))
 111                         options.check_self_contained_and_connected = 0;
 112                 else
 113                         return -1;
 114                 return 0;
 115         }
 116         else if (!strcmp(name, "cas")) {
 117                 struct strbuf val = STRBUF_INIT;
 118                 strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
 119                 string_list_append(&cas_options, val.buf);
 120                 strbuf_release(&val);
 121                 return 0;
 122         } else if (!strcmp(name, "cloning")) {
 123                 if (!strcmp(value, "true"))
 124                         options.cloning = 1;
 125                 else if (!strcmp(value, "false"))
 126                         options.cloning = 0;
 127                 else
 128                         return -1;
 129                 return 0;
 130         } else if (!strcmp(name, "update-shallow")) {
 131                 if (!strcmp(value, "true"))
 132                         options.update_shallow = 1;
 133                 else if (!strcmp(value, "false"))
 134                         options.update_shallow = 0;
 135                 else
 136                         return -1;
 137                 return 0;
 138         } else if (!strcmp(name, "pushcert")) {
 139                 if (!strcmp(value, "true"))
 140                         options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 141                 else if (!strcmp(value, "false"))
 142                         options.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 143                 else if (!strcmp(value, "if-asked"))
 144                         options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 145                 else
 146                         return -1;
 147                 return 0;
 148         } else if (!strcmp(name, "push-option")) {
 149                 if (*value != '"')
 150                         string_list_append(&options.push_options, value);
 151                 else {
 152                         struct strbuf unquoted = STRBUF_INIT;
 153                         if (unquote_c_style(&unquoted, value, NULL) < 0)
 154                                 die("invalid quoting in push-option value");
 155                         string_list_append_nodup(&options.push_options,
 156                                                  strbuf_detach(&unquoted, NULL));
 157                 }
 158                 return 0;
 159
 160 #if LIBCURL_VERSION_NUM >= 0x070a08
 161         } else if (!strcmp(name, "family")) {
 162                 if (!strcmp(value, "ipv4"))
 163                         git_curl_ipresolve = CURL_IPRESOLVE_V4;
 164                 else if (!strcmp(value, "ipv6"))
 165                         git_curl_ipresolve = CURL_IPRESOLVE_V6;
 166                 else if (!strcmp(value, "all"))
 167                         git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
 168                 else
 169                         return -1;
 170                 return 0;
 171 #endif /* LIBCURL_VERSION_NUM >= 0x070a08 */
 172         } else if (!strcmp(name, "from-promisor")) {
 173                 options.from_promisor = 1;
 174                 return 0;
 175         } else if (!strcmp(name, "no-dependents")) {
 176                 options.no_dependents = 1;
 177                 return 0;
 178         } else if (!strcmp(name, "filter")) {
 179                 options.filter = xstrdup(value);;
 180                 return 0;
 181         } else {
 182                 return 1 /* unsupported */;
 183         }
 184 }
 185
 186 struct discovery {
 187         const char *service;
 188         char *buf_alloc;
 189         char *buf;
 190         size_t len;
 191         struct ref *refs;
 192         struct oid_array shallow;
 193         unsigned proto_git : 1;
 194 };
 195 static struct discovery *last_discovery;
 196
 197 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 198 {
 199         struct ref *list = NULL;
 200         get_remote_heads(-1, heads->buf, heads->len, &list,
 201                          for_push ? REF_NORMAL : 0, NULL, &heads->shallow);
 202         return list;
 203 }
 204
 205 static struct ref *parse_info_refs(struct discovery *heads)
 206 {
 207         char *data, *start, *mid;
 208         char *ref_name;
 209         int i = 0;
 210
 211         struct ref *refs = NULL;
 212         struct ref *ref = NULL;
 213         struct ref *last_ref = NULL;
 214
 215         data = heads->buf;
 216         start = NULL;
 217         mid = data;
 218         while (i < heads->len) {
 219                 if (!start) {
 220                         start = &data[i];
 221                 }
 222                 if (data[i] == '\t')
 223                         mid = &data[i];
 224                 if (data[i] == '\n') {
 225                         if (mid - start != 40)
 226                                 die("%sinfo/refs not valid: is this a git repository?",
 227                                     url.buf);
 228                         data[i] = 0;
 229                         ref_name = mid + 1;
 230                         ref = alloc_ref(ref_name);
 231                         get_oid_hex(start, &ref->old_oid);
 232                         if (!refs)
 233                                 refs = ref;
 234                         if (last_ref)
 235                                 last_ref->next = ref;
 236                         last_ref = ref;
 237                         start = NULL;
 238                 }
 239                 i++;
 240         }
 241
 242         ref = alloc_ref("HEAD");
 243         if (!http_fetch_ref(url.buf, ref) &&
 244             !resolve_remote_symref(ref, refs)) {
 245                 ref->next = refs;
 246                 refs = ref;
 247         } else {
 248                 free(ref);
 249         }
 250
 251         return refs;
 252 }
 253
 254 static void free_discovery(struct discovery *d)
 255 {
 256         if (d) {
 257                 if (d == last_discovery)
 258                         last_discovery = NULL;
 259                 free(d->shallow.oid);
 260                 free(d->buf_alloc);
 261                 free_refs(d->refs);
 262                 free(d);
 263         }
 264 }
 265
 266 static int show_http_message(struct strbuf *type, struct strbuf *charset,
 267                              struct strbuf *msg)
 268 {
 269         const char *p, *eol;
 270
 271         /*
 272          * We only show text/plain parts, as other types are likely
 273          * to be ugly to look at on the user's terminal.
 274          */
 275         if (strcmp(type->buf, "text/plain"))
 276                 return -1;
 277         if (charset->len)
 278                 strbuf_reencode(msg, charset->buf, get_log_output_encoding());
 279
 280         strbuf_trim(msg);
 281         if (!msg->len)
 282                 return -1;
 283
 284         p = msg->buf;
 285         do {
 286                 eol = strchrnul(p, '\n');
 287                 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 288                 p = eol + 1;
 289         } while(*eol);
 290         return 0;
 291 }
 292
 293 static struct discovery *discover_refs(const char *service, int for_push)
 294 {
 295         struct strbuf exp = STRBUF_INIT;
 296         struct strbuf type = STRBUF_INIT;
 297         struct strbuf charset = STRBUF_INIT;
 298         struct strbuf buffer = STRBUF_INIT;
 299         struct strbuf refs_url = STRBUF_INIT;
 300         struct strbuf effective_url = STRBUF_INIT;
 301         struct discovery *last = last_discovery;
 302         int http_ret, maybe_smart = 0;
 303         struct http_get_options http_options;
 304
 305         if (last && !strcmp(service, last->service))
 306                 return last;
 307         free_discovery(last);
 308
 309         strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 310         if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 311              git_env_bool("GIT_SMART_HTTP", 1)) {
 312                 maybe_smart = 1;
 313                 if (!strchr(url.buf, '?'))
 314                         strbuf_addch(&refs_url, '?');
 315                 else
 316                         strbuf_addch(&refs_url, '&');
 317                 strbuf_addf(&refs_url, "service=%s", service);
 318         }
 319
 320         memset(&http_options, 0, sizeof(http_options));
 321         http_options.content_type = &type;
 322         http_options.charset = &charset;
 323         http_options.effective_url = &effective_url;
 324         http_options.base_url = &url;
 325         http_options.initial_request = 1;
 326         http_options.no_cache = 1;
 327         http_options.keep_error = 1;
 328
 329         http_ret = http_get_strbuf(refs_url.buf, &buffer, &http_options);
 330         switch (http_ret) {
 331         case HTTP_OK:
 332                 break;
 333         case HTTP_MISSING_TARGET:
 334                 show_http_message(&type, &charset, &buffer);
 335                 die("repository '%s' not found", url.buf);
 336         case HTTP_NOAUTH:
 337                 show_http_message(&type, &charset, &buffer);
 338                 die("Authentication failed for '%s'", url.buf);
 339         default:
 340                 show_http_message(&type, &charset, &buffer);
 341                 die("unable to access '%s': %s", url.buf, curl_errorstr);
 342         }
 343
 344         if (options.verbosity && !starts_with(refs_url.buf, url.buf))
 345                 warning(_("redirecting to %s"), url.buf);
 346
 347         last= xcalloc(1, sizeof(*last_discovery));
 348         last->service = service;
 349         last->buf_alloc = strbuf_detach(&buffer, &last->len);
 350         last->buf = last->buf_alloc;
 351
 352         strbuf_addf(&exp, "application/x-%s-advertisement", service);
 353         if (maybe_smart &&
 354             (5 <= last->len && last->buf[4] == '#') &&
 355             !strbuf_cmp(&exp, &type)) {
 356                 char *line;
 357
 358                 /*
 359                  * smart HTTP response; validate that the service
 360                  * pkt-line matches our request.
 361                  */
 362                 line = packet_read_line_buf(&last->buf, &last->len, NULL);
 363                 if (!line)
 364                         die("invalid server response; expected service, got flush packet");
 365
 366                 strbuf_reset(&exp);
 367                 strbuf_addf(&exp, "# service=%s", service);
 368                 if (strcmp(line, exp.buf))
 369                         die("invalid server response; got '%s'", line);
 370                 strbuf_release(&exp);
 371
 372                 /* The header can include additional metadata lines, up
 373                  * until a packet flush marker.  Ignore these now, but
 374                  * in the future we might start to scan them.
 375                  */
 376                 while (packet_read_line_buf(&last->buf, &last->len, NULL))
 377                         ;
 378
 379                 last->proto_git = 1;
 380         }
 381
 382         if (last->proto_git)
 383                 last->refs = parse_git_refs(last, for_push);
 384         else
 385                 last->refs = parse_info_refs(last);
 386
 387         strbuf_release(&refs_url);
 388         strbuf_release(&exp);
 389         strbuf_release(&type);
 390         strbuf_release(&charset);
 391         strbuf_release(&effective_url);
 392         strbuf_release(&buffer);
 393         last_discovery = last;
 394         return last;
 395 }
 396
 397 static struct ref *get_refs(int for_push)
 398 {
 399         struct discovery *heads;
 400
 401         if (for_push)
 402                 heads = discover_refs("git-receive-pack", for_push);
 403         else
 404                 heads = discover_refs("git-upload-pack", for_push);
 405
 406         return heads->refs;
 407 }
 408
 409 static void output_refs(struct ref *refs)
 410 {
 411         struct ref *posn;
 412         for (posn = refs; posn; posn = posn->next) {
 413                 if (posn->symref)
 414                         printf("@%s %s\n", posn->symref, posn->name);
 415                 else
 416                         printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name);
 417         }
 418         printf("\n");
 419         fflush(stdout);
 420 }
 421
 422 struct rpc_state {
 423         const char *service_name;
 424         const char **argv;
 425         struct strbuf *stdin_preamble;
 426         char *service_url;
 427         char *hdr_content_type;
 428         char *hdr_accept;
 429         char *buf;
 430         size_t alloc;
 431         size_t len;
 432         size_t pos;
 433         int in;
 434         int out;
 435         int any_written;
 436         struct strbuf result;
 437         unsigned gzip_request : 1;
 438         unsigned initial_buffer : 1;
 439 };
 440
 441 static size_t rpc_out(void *ptr, size_t eltsize,
 442                 size_t nmemb, void *buffer_)
 443 {
 444         size_t max = eltsize * nmemb;
 445         struct rpc_state *rpc = buffer_;
 446         size_t avail = rpc->len - rpc->pos;
 447
 448         if (!avail) {
 449                 rpc->initial_buffer = 0;
 450                 avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 451                 if (!avail)
 452                         return 0;
 453                 rpc->pos = 0;
 454                 rpc->len = avail;
 455         }
 456
 457         if (max < avail)
 458                 avail = max;
 459         memcpy(ptr, rpc->buf + rpc->pos, avail);
 460         rpc->pos += avail;
 461         return avail;
 462 }
 463
 464 #ifndef NO_CURL_IOCTL
 465 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 466 {
 467         struct rpc_state *rpc = clientp;
 468
 469         switch (cmd) {
 470         case CURLIOCMD_NOP:
 471                 return CURLIOE_OK;
 472
 473         case CURLIOCMD_RESTARTREAD:
 474                 if (rpc->initial_buffer) {
 475                         rpc->pos = 0;
 476                         return CURLIOE_OK;
 477                 }
 478                 error("unable to rewind rpc post data - try increasing http.postBuffer");
 479                 return CURLIOE_FAILRESTART;
 480
 481         default:
 482                 return CURLIOE_UNKNOWNCMD;
 483         }
 484 }
 485 #endif
 486
 487 static size_t rpc_in(char *ptr, size_t eltsize,
 488                 size_t nmemb, void *buffer_)
 489 {
 490         size_t size = eltsize * nmemb;
 491         struct rpc_state *rpc = buffer_;
 492         if (size)
 493                 rpc->any_written = 1;
 494         write_or_die(rpc->in, ptr, size);
 495         return size;
 496 }
 497
 498 static int run_slot(struct active_request_slot *slot,
 499                     struct slot_results *results)
 500 {
 501         int err;
 502         struct slot_results results_buf;
 503
 504         if (!results)
 505                 results = &results_buf;
 506
 507         err = run_one_slot(slot, results);
 508
 509         if (err != HTTP_OK && err != HTTP_REAUTH) {
 510                 struct strbuf msg = STRBUF_INIT;
 511                 if (results->http_code && results->http_code != 200)
 512                         strbuf_addf(&msg, "HTTP %ld", results->http_code);
 513                 if (results->curl_result != CURLE_OK) {
 514                         if (msg.len)
 515                                 strbuf_addch(&msg, ' ');
 516                         strbuf_addf(&msg, "curl %d", results->curl_result);
 517                         if (curl_errorstr[0]) {
 518                                 strbuf_addch(&msg, ' ');
 519                                 strbuf_addstr(&msg, curl_errorstr);
 520                         }
 521                 }
 522                 error("RPC failed; %s", msg.buf);
 523                 strbuf_release(&msg);
 524         }
 525
 526         return err;
 527 }
 528
 529 static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 530 {
 531         struct active_request_slot *slot;
 532         struct curl_slist *headers = http_copy_default_headers();
 533         struct strbuf buf = STRBUF_INIT;
 534         int err;
 535
 536         slot = get_active_slot();
 537
 538         headers = curl_slist_append(headers, rpc->hdr_content_type);
 539         headers = curl_slist_append(headers, rpc->hdr_accept);
 540
 541         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 542         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 543         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 544         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 545         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 546         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 547         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 548         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 549         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 550
 551         err = run_slot(slot, results);
 552
 553         curl_slist_free_all(headers);
 554         strbuf_release(&buf);
 555         return err;
 556 }
 557
 558 static curl_off_t xcurl_off_t(ssize_t len) {
 559         if (len > maximum_signed_value_of_type(curl_off_t))
 560                 die("cannot handle pushes this big");
 561         return (curl_off_t) len;
 562 }
 563
 564 static int post_rpc(struct rpc_state *rpc)
 565 {
 566         struct active_request_slot *slot;
 567         struct curl_slist *headers = http_copy_default_headers();
 568         int use_gzip = rpc->gzip_request;
 569         char *gzip_body = NULL;
 570         size_t gzip_size = 0;
 571         int err, large_request = 0;
 572         int needs_100_continue = 0;
 573
 574         /* Try to load the entire request, if we can fit it into the
 575          * allocated buffer space we can use HTTP/1.0 and avoid the
 576          * chunked encoding mess.
 577          */
 578         while (1) {
 579                 size_t left = rpc->alloc - rpc->len;
 580                 char *buf = rpc->buf + rpc->len;
 581                 int n;
 582
 583                 if (left < LARGE_PACKET_MAX) {
 584                         large_request = 1;
 585                         use_gzip = 0;
 586                         break;
 587                 }
 588
 589                 n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 590                 if (!n)
 591                         break;
 592                 rpc->len += n;
 593         }
 594
 595         if (large_request) {
 596                 struct slot_results results;
 597
 598                 do {
 599                         err = probe_rpc(rpc, &results);
 600                         if (err == HTTP_REAUTH)
 601                                 credential_fill(&http_auth);
 602                 } while (err == HTTP_REAUTH);
 603                 if (err != HTTP_OK)
 604                         return -1;
 605
 606                 if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 607                         needs_100_continue = 1;
 608         }
 609
 610         headers = curl_slist_append(headers, rpc->hdr_content_type);
 611         headers = curl_slist_append(headers, rpc->hdr_accept);
 612         headers = curl_slist_append(headers, needs_100_continue ?
 613                 "Expect: 100-continue" : "Expect:");
 614
 615 retry:
 616         slot = get_active_slot();
 617
 618         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 619         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 620         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 621         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 622
 623         if (large_request) {
 624                 /* The request body is large and the size cannot be predicted.
 625                  * We must use chunked encoding to send it.
 626                  */
 627                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 628                 rpc->initial_buffer = 1;
 629                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 630                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 631 #ifndef NO_CURL_IOCTL
 632                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 633                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 634 #endif
 635                 if (options.verbosity > 1) {
 636                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 637                         fflush(stderr);
 638                 }
 639
 640         } else if (gzip_body) {
 641                 /*
 642                  * If we are looping to retry authentication, then the previous
 643                  * run will have set up the headers and gzip buffer already,
 644                  * and we just need to send it.
 645                  */
 646                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 647                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 648
 649         } else if (use_gzip && 1024 < rpc->len) {
 650                 /* The client backend isn't giving us compressed data so
 651                  * we can try to deflate it ourselves, this may save on.
 652                  * the transfer time.
 653                  */
 654                 git_zstream stream;
 655                 int ret;
 656
 657                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 658                 gzip_size = git_deflate_bound(&stream, rpc->len);
 659                 gzip_body = xmalloc(gzip_size);
 660
 661                 stream.next_in = (unsigned char *)rpc->buf;
 662                 stream.avail_in = rpc->len;
 663                 stream.next_out = (unsigned char *)gzip_body;
 664                 stream.avail_out = gzip_size;
 665
 666                 ret = git_deflate(&stream, Z_FINISH);
 667                 if (ret != Z_STREAM_END)
 668                         die("cannot deflate request; zlib deflate error %d", ret);
 669
 670                 ret = git_deflate_end_gently(&stream);
 671                 if (ret != Z_OK)
 672                         die("cannot deflate request; zlib end error %d", ret);
 673
 674                 gzip_size = stream.total_out;
 675
 676                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 677                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 678                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 679
 680                 if (options.verbosity > 1) {
 681                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 682                                 rpc->service_name,
 683                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
 684                         fflush(stderr);
 685                 }
 686         } else {
 687                 /* We know the complete request size in advance, use the
 688                  * more normal Content-Length approach.
 689                  */
 690                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 691                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(rpc->len));
 692                 if (options.verbosity > 1) {
 693                         fprintf(stderr, "POST %s (%lu bytes)\n",
 694                                 rpc->service_name, (unsigned long)rpc->len);
 695                         fflush(stderr);
 696                 }
 697         }
 698
 699         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 700         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 701         curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 702
 703
 704         rpc->any_written = 0;
 705         err = run_slot(slot, NULL);
 706         if (err == HTTP_REAUTH && !large_request) {
 707                 credential_fill(&http_auth);
 708                 goto retry;
 709         }
 710         if (err != HTTP_OK)
 711                 err = -1;
 712
 713         if (!rpc->any_written)
 714                 err = -1;
 715
 716         curl_slist_free_all(headers);
 717         free(gzip_body);
 718         return err;
 719 }
 720
 721 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 722 {
 723         const char *svc = rpc->service_name;
 724         struct strbuf buf = STRBUF_INIT;
 725         struct strbuf *preamble = rpc->stdin_preamble;
 726         struct child_process client = CHILD_PROCESS_INIT;
 727         int err = 0;
 728
 729         client.in = -1;
 730         client.out = -1;
 731         client.git_cmd = 1;
 732         client.argv = rpc->argv;
 733         if (start_command(&client))
 734                 exit(1);
 735         if (preamble)
 736                 write_or_die(client.in, preamble->buf, preamble->len);
 737         if (heads)
 738                 write_or_die(client.in, heads->buf, heads->len);
 739
 740         rpc->alloc = http_post_buffer;
 741         rpc->buf = xmalloc(rpc->alloc);
 742         rpc->in = client.in;
 743         rpc->out = client.out;
 744         strbuf_init(&rpc->result, 0);
 745
 746         strbuf_addf(&buf, "%s%s", url.buf, svc);
 747         rpc->service_url = strbuf_detach(&buf, NULL);
 748
 749         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 750         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 751
 752         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 753         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 754
 755         while (!err) {
 756                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 757                 if (!n)
 758                         break;
 759                 rpc->pos = 0;
 760                 rpc->len = n;
 761                 err |= post_rpc(rpc);
 762         }
 763
 764         close(client.in);
 765         client.in = -1;
 766         if (!err) {
 767                 strbuf_read(&rpc->result, client.out, 0);
 768         } else {
 769                 char buf[4096];
 770                 for (;;)
 771                         if (xread(client.out, buf, sizeof(buf)) <= 0)
 772                                 break;
 773         }
 774
 775         close(client.out);
 776         client.out = -1;
 777
 778         err |= finish_command(&client);
 779         free(rpc->service_url);
 780         free(rpc->hdr_content_type);
 781         free(rpc->hdr_accept);
 782         free(rpc->buf);
 783         strbuf_release(&buf);
 784         return err;
 785 }
 786
 787 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 788 {
 789         struct walker *walker;
 790         char **targets;
 791         int ret, i;
 792
 793         ALLOC_ARRAY(targets, nr_heads);
 794         if (options.depth || options.deepen_since)
 795                 die("dumb http transport does not support shallow capabilities");
 796         for (i = 0; i < nr_heads; i++)
 797                 targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
 798
 799         walker = get_http_walker(url.buf);
 800         walker->get_all = 1;
 801         walker->get_tree = 1;
 802         walker->get_history = 1;
 803         walker->get_verbosely = options.verbosity >= 3;
 804         walker->get_recover = 0;
 805         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 806         walker_free(walker);
 807
 808         for (i = 0; i < nr_heads; i++)
 809                 free(targets[i]);
 810         free(targets);
 811
 812         return ret ? error("fetch failed.") : 0;
 813 }
 814
 815 static int fetch_git(struct discovery *heads,
 816         int nr_heads, struct ref **to_fetch)
 817 {
 818         struct rpc_state rpc;
 819         struct strbuf preamble = STRBUF_INIT;
 820         int i, err;
 821         struct argv_array args = ARGV_ARRAY_INIT;
 822
 823         argv_array_pushl(&args, "fetch-pack", "--stateless-rpc",
 824                          "--stdin", "--lock-pack", NULL);
 825         if (options.followtags)
 826                 argv_array_push(&args, "--include-tag");
 827         if (options.thin)
 828                 argv_array_push(&args, "--thin");
 829         if (options.verbosity >= 3)
 830                 argv_array_pushl(&args, "-v", "-v", NULL);
 831         if (options.check_self_contained_and_connected)
 832                 argv_array_push(&args, "--check-self-contained-and-connected");
 833         if (options.cloning)
 834                 argv_array_push(&args, "--cloning");
 835         if (options.update_shallow)
 836                 argv_array_push(&args, "--update-shallow");
 837         if (!options.progress)
 838                 argv_array_push(&args, "--no-progress");
 839         if (options.depth)
 840                 argv_array_pushf(&args, "--depth=%lu", options.depth);
 841         if (options.deepen_since)
 842                 argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since);
 843         for (i = 0; i < options.deepen_not.nr; i++)
 844                 argv_array_pushf(&args, "--shallow-exclude=%s",
 845                                  options.deepen_not.items[i].string);
 846         if (options.deepen_relative && options.depth)
 847                 argv_array_push(&args, "--deepen-relative");
 848         if (options.from_promisor)
 849                 argv_array_push(&args, "--from-promisor");
 850         if (options.no_dependents)
 851                 argv_array_push(&args, "--no-dependents");
 852         if (options.filter)
 853                 argv_array_pushf(&args, "--filter=%s", options.filter);
 854         argv_array_push(&args, url.buf);
 855
 856         for (i = 0; i < nr_heads; i++) {
 857                 struct ref *ref = to_fetch[i];
 858                 if (!*ref->name)
 859                         die("cannot fetch by sha1 over smart http");
 860                 packet_buf_write(&preamble, "%s %s\n",
 861                                  oid_to_hex(&ref->old_oid), ref->name);
 862         }
 863         packet_buf_flush(&preamble);
 864
 865         memset(&rpc, 0, sizeof(rpc));
 866         rpc.service_name = "git-upload-pack",
 867         rpc.argv = args.argv;
 868         rpc.stdin_preamble = &preamble;
 869         rpc.gzip_request = 1;
 870
 871         err = rpc_service(&rpc, heads);
 872         if (rpc.result.len)
 873                 write_or_die(1, rpc.result.buf, rpc.result.len);
 874         strbuf_release(&rpc.result);
 875         strbuf_release(&preamble);
 876         argv_array_clear(&args);
 877         return err;
 878 }
 879
 880 static int fetch(int nr_heads, struct ref **to_fetch)
 881 {
 882         struct discovery *d = discover_refs("git-upload-pack", 0);
 883         if (d->proto_git)
 884                 return fetch_git(d, nr_heads, to_fetch);
 885         else
 886                 return fetch_dumb(nr_heads, to_fetch);
 887 }
 888
 889 static void parse_fetch(struct strbuf *buf)
 890 {
 891         struct ref **to_fetch = NULL;
 892         struct ref *list_head = NULL;
 893         struct ref **list = &list_head;
 894         int alloc_heads = 0, nr_heads = 0;
 895
 896         do {
 897                 const char *p;
 898                 if (skip_prefix(buf->buf, "fetch ", &p)) {
 899                         const char *name;
 900                         struct ref *ref;
 901                         struct object_id old_oid;
 902
 903                         if (get_oid_hex(p, &old_oid))
 904                                 die("protocol error: expected sha/ref, got %s'", p);
 905                         if (p[GIT_SHA1_HEXSZ] == ' ')
 906                                 name = p + GIT_SHA1_HEXSZ + 1;
 907                         else if (!p[GIT_SHA1_HEXSZ])
 908                                 name = "";
 909                         else
 910                                 die("protocol error: expected sha/ref, got %s'", p);
 911
 912                         ref = alloc_ref(name);
 913                         oidcpy(&ref->old_oid, &old_oid);
 914
 915                         *list = ref;
 916                         list = &ref->next;
 917
 918                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 919                         to_fetch[nr_heads++] = ref;
 920                 }
 921                 else
 922                         die("http transport does not support %s", buf->buf);
 923
 924                 strbuf_reset(buf);
 925                 if (strbuf_getline_lf(buf, stdin) == EOF)
 926                         return;
 927                 if (!*buf->buf)
 928                         break;
 929         } while (1);
 930
 931         if (fetch(nr_heads, to_fetch))
 932                 exit(128); /* error already reported */
 933         free_refs(list_head);
 934         free(to_fetch);
 935
 936         printf("\n");
 937         fflush(stdout);
 938         strbuf_reset(buf);
 939 }
 940
 941 static int push_dav(int nr_spec, char **specs)
 942 {
 943         struct child_process child = CHILD_PROCESS_INIT;
 944         size_t i;
 945
 946         child.git_cmd = 1;
 947         argv_array_push(&child.args, "http-push");
 948         argv_array_push(&child.args, "--helper-status");
 949         if (options.dry_run)
 950                 argv_array_push(&child.args, "--dry-run");
 951         if (options.verbosity > 1)
 952                 argv_array_push(&child.args, "--verbose");
 953         argv_array_push(&child.args, url.buf);
 954         for (i = 0; i < nr_spec; i++)
 955                 argv_array_push(&child.args, specs[i]);
 956
 957         if (run_command(&child))
 958                 die("git-http-push failed");
 959         return 0;
 960 }
 961
 962 static int push_git(struct discovery *heads, int nr_spec, char **specs)
 963 {
 964         struct rpc_state rpc;
 965         int i, err;
 966         struct argv_array args;
 967         struct string_list_item *cas_option;
 968         struct strbuf preamble = STRBUF_INIT;
 969
 970         argv_array_init(&args);
 971         argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 972                          NULL);
 973
 974         if (options.thin)
 975                 argv_array_push(&args, "--thin");
 976         if (options.dry_run)
 977                 argv_array_push(&args, "--dry-run");
 978         if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
 979                 argv_array_push(&args, "--signed=yes");
 980         else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
 981                 argv_array_push(&args, "--signed=if-asked");
 982         if (options.verbosity == 0)
 983                 argv_array_push(&args, "--quiet");
 984         else if (options.verbosity > 1)
 985                 argv_array_push(&args, "--verbose");
 986         for (i = 0; i < options.push_options.nr; i++)
 987                 argv_array_pushf(&args, "--push-option=%s",
 988                                  options.push_options.items[i].string);
 989         argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 990         for_each_string_list_item(cas_option, &cas_options)
 991                 argv_array_push(&args, cas_option->string);
 992         argv_array_push(&args, url.buf);
 993
 994         argv_array_push(&args, "--stdin");
 995         for (i = 0; i < nr_spec; i++)
 996                 packet_buf_write(&preamble, "%s\n", specs[i]);
 997         packet_buf_flush(&preamble);
 998
 999         memset(&rpc, 0, sizeof(rpc));
1000         rpc.service_name = "git-receive-pack",
1001         rpc.argv = args.argv;
1002         rpc.stdin_preamble = &preamble;
1003
1004         err = rpc_service(&rpc, heads);
1005         if (rpc.result.len)
1006                 write_or_die(1, rpc.result.buf, rpc.result.len);
1007         strbuf_release(&rpc.result);
1008         strbuf_release(&preamble);
1009         argv_array_clear(&args);
1010         return err;
1011 }
1012
1013 static int push(int nr_spec, char **specs)
1014 {
1015         struct discovery *heads = discover_refs("git-receive-pack", 1);
1016         int ret;
1017
1018         if (heads->proto_git)
1019                 ret = push_git(heads, nr_spec, specs);
1020         else
1021                 ret = push_dav(nr_spec, specs);
1022         free_discovery(heads);
1023         return ret;
1024 }
1025
1026 static void parse_push(struct strbuf *buf)
1027 {
1028         char **specs = NULL;
1029         int alloc_spec = 0, nr_spec = 0, i, ret;
1030
1031         do {
1032                 if (starts_with(buf->buf, "push ")) {
1033                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
1034                         specs[nr_spec++] = xstrdup(buf->buf + 5);
1035                 }
1036                 else
1037                         die("http transport does not support %s", buf->buf);
1038
1039                 strbuf_reset(buf);
1040                 if (strbuf_getline_lf(buf, stdin) == EOF)
1041                         goto free_specs;
1042                 if (!*buf->buf)
1043                         break;
1044         } while (1);
1045
1046         ret = push(nr_spec, specs);
1047         printf("\n");
1048         fflush(stdout);
1049
1050         if (ret)
1051                 exit(128); /* error already reported */
1052
1053  free_specs:
1054         for (i = 0; i < nr_spec; i++)
1055                 free(specs[i]);
1056         free(specs);
1057 }
1058
1059 int cmd_main(int argc, const char **argv)
1060 {
1061         struct strbuf buf = STRBUF_INIT;
1062         int nongit;
1063
1064         setup_git_directory_gently(&nongit);
1065         if (argc < 2) {
1066                 error("remote-curl: usage: git remote-curl <remote> [<url>]");
1067                 return 1;
1068         }
1069
1070         options.verbosity = 1;
1071         options.progress = !!isatty(2);
1072         options.thin = 1;
1073         string_list_init(&options.deepen_not, 1);
1074         string_list_init(&options.push_options, 1);
1075
1076         remote = remote_get(argv[1]);
1077
1078         if (argc > 2) {
1079                 end_url_with_slash(&url, argv[2]);
1080         } else {
1081                 end_url_with_slash(&url, remote->url[0]);
1082         }
1083
1084         http_init(remote, url.buf, 0);
1085
1086         do {
1087                 const char *arg;
1088
1089                 if (strbuf_getline_lf(&buf, stdin) == EOF) {
1090                         if (ferror(stdin))
1091                                 error("remote-curl: error reading command stream from git");
1092                         return 1;
1093                 }
1094                 if (buf.len == 0)
1095                         break;
1096                 if (starts_with(buf.buf, "fetch ")) {
1097                         if (nongit)
1098                                 die("remote-curl: fetch attempted without a local repo");
1099                         parse_fetch(&buf);
1100
1101                 } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1102                         int for_push = !!strstr(buf.buf + 4, "for-push");
1103                         output_refs(get_refs(for_push));
1104
1105                 } else if (starts_with(buf.buf, "push ")) {
1106                         parse_push(&buf);
1107
1108                 } else if (skip_prefix(buf.buf, "option ", &arg)) {
1109                         char *value = strchr(arg, ' ');
1110                         int result;
1111
1112                         if (value)
1113                                 *value++ = '\0';
1114                         else
1115                                 value = "true";
1116
1117                         result = set_option(arg, value);
1118                         if (!result)
1119                                 printf("ok\n");
1120                         else if (result < 0)
1121                                 printf("error invalid value\n");
1122                         else
1123                                 printf("unsupported\n");
1124                         fflush(stdout);
1125
1126                 } else if (!strcmp(buf.buf, "capabilities")) {
1127                         printf("fetch\n");
1128                         printf("option\n");
1129                         printf("push\n");
1130                         printf("check-connectivity\n");
1131                         printf("\n");
1132                         fflush(stdout);
1133                 } else {
1134                         error("remote-curl: unknown command '%s' from git", buf.buf);
1135                         return 1;
1136                 }
1137                 strbuf_reset(&buf);
1138         } while (1);
1139
1140         http_cleanup();
1141
1142         return 0;
1143 }