git.oblomov.eu Git - git/blob - remote-curl.c

   1 #include "cache.h"
   2 #include "config.h"
   3 #include "remote.h"
   4 #include "connect.h"
   5 #include "strbuf.h"
   6 #include "walker.h"
   7 #include "http.h"
   8 #include "exec_cmd.h"
   9 #include "run-command.h"
  10 #include "pkt-line.h"
  11 #include "string-list.h"
  12 #include "sideband.h"
  13 #include "argv-array.h"
  14 #include "credential.h"
  15 #include "sha1-array.h"
  16 #include "send-pack.h"
  17 #include "protocol.h"
  18
  19 static struct remote *remote;
  20 /* always ends with a trailing slash */
  21 static struct strbuf url = STRBUF_INIT;
  22
  23 struct options {
  24         int verbosity;
  25         unsigned long depth;
  26         char *deepen_since;
  27         struct string_list deepen_not;
  28         struct string_list push_options;
  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 };
  40 static struct options options;
  41 static struct string_list cas_options = STRING_LIST_INIT_DUP;
  42
  43 static int set_option(const char *name, const char *value)
  44 {
  45         if (!strcmp(name, "verbosity")) {
  46                 char *end;
  47                 int v = strtol(value, &end, 10);
  48                 if (value == end || *end)
  49                         return -1;
  50                 options.verbosity = v;
  51                 return 0;
  52         }
  53         else if (!strcmp(name, "progress")) {
  54                 if (!strcmp(value, "true"))
  55                         options.progress = 1;
  56                 else if (!strcmp(value, "false"))
  57                         options.progress = 0;
  58                 else
  59                         return -1;
  60                 return 0;
  61         }
  62         else if (!strcmp(name, "depth")) {
  63                 char *end;
  64                 unsigned long v = strtoul(value, &end, 10);
  65                 if (value == end || *end)
  66                         return -1;
  67                 options.depth = v;
  68                 return 0;
  69         }
  70         else if (!strcmp(name, "deepen-since")) {
  71                 options.deepen_since = xstrdup(value);
  72                 return 0;
  73         }
  74         else if (!strcmp(name, "deepen-not")) {
  75                 string_list_append(&options.deepen_not, value);
  76                 return 0;
  77         }
  78         else if (!strcmp(name, "deepen-relative")) {
  79                 if (!strcmp(value, "true"))
  80                         options.deepen_relative = 1;
  81                 else if (!strcmp(value, "false"))
  82                         options.deepen_relative = 0;
  83                 else
  84                         return -1;
  85                 return 0;
  86         }
  87         else if (!strcmp(name, "followtags")) {
  88                 if (!strcmp(value, "true"))
  89                         options.followtags = 1;
  90                 else if (!strcmp(value, "false"))
  91                         options.followtags = 0;
  92                 else
  93                         return -1;
  94                 return 0;
  95         }
  96         else if (!strcmp(name, "dry-run")) {
  97                 if (!strcmp(value, "true"))
  98                         options.dry_run = 1;
  99                 else if (!strcmp(value, "false"))
 100                         options.dry_run = 0;
 101                 else
 102                         return -1;
 103                 return 0;
 104         }
 105         else if (!strcmp(name, "check-connectivity")) {
 106                 if (!strcmp(value, "true"))
 107                         options.check_self_contained_and_connected = 1;
 108                 else if (!strcmp(value, "false"))
 109                         options.check_self_contained_and_connected = 0;
 110                 else
 111                         return -1;
 112                 return 0;
 113         }
 114         else if (!strcmp(name, "cas")) {
 115                 struct strbuf val = STRBUF_INIT;
 116                 strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
 117                 string_list_append(&cas_options, val.buf);
 118                 strbuf_release(&val);
 119                 return 0;
 120         } else if (!strcmp(name, "cloning")) {
 121                 if (!strcmp(value, "true"))
 122                         options.cloning = 1;
 123                 else if (!strcmp(value, "false"))
 124                         options.cloning = 0;
 125                 else
 126                         return -1;
 127                 return 0;
 128         } else if (!strcmp(name, "update-shallow")) {
 129                 if (!strcmp(value, "true"))
 130                         options.update_shallow = 1;
 131                 else if (!strcmp(value, "false"))
 132                         options.update_shallow = 0;
 133                 else
 134                         return -1;
 135                 return 0;
 136         } else if (!strcmp(name, "pushcert")) {
 137                 if (!strcmp(value, "true"))
 138                         options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 139                 else if (!strcmp(value, "false"))
 140                         options.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 141                 else if (!strcmp(value, "if-asked"))
 142                         options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 143                 else
 144                         return -1;
 145                 return 0;
 146         } else if (!strcmp(name, "push-option")) {
 147                 string_list_append(&options.push_options, value);
 148                 return 0;
 149
 150 #if LIBCURL_VERSION_NUM >= 0x070a08
 151         } else if (!strcmp(name, "family")) {
 152                 if (!strcmp(value, "ipv4"))
 153                         git_curl_ipresolve = CURL_IPRESOLVE_V4;
 154                 else if (!strcmp(value, "ipv6"))
 155                         git_curl_ipresolve = CURL_IPRESOLVE_V6;
 156                 else if (!strcmp(value, "all"))
 157                         git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
 158                 else
 159                         return -1;
 160                 return 0;
 161 #endif /* LIBCURL_VERSION_NUM >= 0x070a08 */
 162         } else {
 163                 return 1 /* unsupported */;
 164         }
 165 }
 166
 167 struct discovery {
 168         char *service;
 169         char *buf_alloc;
 170         char *buf;
 171         size_t len;
 172         struct ref *refs;
 173         struct oid_array shallow;
 174         enum protocol_version version;
 175         unsigned proto_git : 1;
 176 };
 177 static struct discovery *last_discovery;
 178
 179 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 180 {
 181         struct ref *list = NULL;
 182         struct packet_reader reader;
 183
 184         packet_reader_init(&reader, -1, heads->buf, heads->len,
 185                            PACKET_READ_CHOMP_NEWLINE |
 186                            PACKET_READ_GENTLE_ON_EOF);
 187
 188         heads->version = discover_version(&reader);
 189         switch (heads->version) {
 190         case protocol_v2:
 191                 die("support for protocol v2 not implemented yet");
 192                 break;
 193         case protocol_v1:
 194         case protocol_v0:
 195                 get_remote_heads(&reader, &list, for_push ? REF_NORMAL : 0,
 196                                  NULL, &heads->shallow);
 197                 break;
 198         case protocol_unknown_version:
 199                 BUG("unknown protocol version");
 200         }
 201
 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->service);
 263                 free(d);
 264         }
 265 }
 266
 267 static int show_http_message(struct strbuf *type, struct strbuf *charset,
 268                              struct strbuf *msg)
 269 {
 270         const char *p, *eol;
 271
 272         /*
 273          * We only show text/plain parts, as other types are likely
 274          * to be ugly to look at on the user's terminal.
 275          */
 276         if (strcmp(type->buf, "text/plain"))
 277                 return -1;
 278         if (charset->len)
 279                 strbuf_reencode(msg, charset->buf, get_log_output_encoding());
 280
 281         strbuf_trim(msg);
 282         if (!msg->len)
 283                 return -1;
 284
 285         p = msg->buf;
 286         do {
 287                 eol = strchrnul(p, '\n');
 288                 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 289                 p = eol + 1;
 290         } while(*eol);
 291         return 0;
 292 }
 293
 294 static struct discovery *discover_refs(const char *service, int for_push)
 295 {
 296         struct strbuf exp = STRBUF_INIT;
 297         struct strbuf type = STRBUF_INIT;
 298         struct strbuf charset = STRBUF_INIT;
 299         struct strbuf buffer = STRBUF_INIT;
 300         struct strbuf refs_url = STRBUF_INIT;
 301         struct strbuf effective_url = STRBUF_INIT;
 302         struct discovery *last = last_discovery;
 303         int http_ret, maybe_smart = 0;
 304         struct http_get_options http_options;
 305
 306         if (last && !strcmp(service, last->service))
 307                 return last;
 308         free_discovery(last);
 309
 310         strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 311         if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 312              git_env_bool("GIT_SMART_HTTP", 1)) {
 313                 maybe_smart = 1;
 314                 if (!strchr(url.buf, '?'))
 315                         strbuf_addch(&refs_url, '?');
 316                 else
 317                         strbuf_addch(&refs_url, '&');
 318                 strbuf_addf(&refs_url, "service=%s", service);
 319         }
 320
 321         memset(&http_options, 0, sizeof(http_options));
 322         http_options.content_type = &type;
 323         http_options.charset = &charset;
 324         http_options.effective_url = &effective_url;
 325         http_options.base_url = &url;
 326         http_options.initial_request = 1;
 327         http_options.no_cache = 1;
 328         http_options.keep_error = 1;
 329
 330         http_ret = http_get_strbuf(refs_url.buf, &buffer, &http_options);
 331         switch (http_ret) {
 332         case HTTP_OK:
 333                 break;
 334         case HTTP_MISSING_TARGET:
 335                 show_http_message(&type, &charset, &buffer);
 336                 die("repository '%s' not found", url.buf);
 337         case HTTP_NOAUTH:
 338                 show_http_message(&type, &charset, &buffer);
 339                 die("Authentication failed for '%s'", url.buf);
 340         default:
 341                 show_http_message(&type, &charset, &buffer);
 342                 die("unable to access '%s': %s", url.buf, curl_errorstr);
 343         }
 344
 345         if (options.verbosity && !starts_with(refs_url.buf, url.buf))
 346                 warning(_("redirecting to %s"), url.buf);
 347
 348         last= xcalloc(1, sizeof(*last_discovery));
 349         last->service = xstrdup(service);
 350         last->buf_alloc = strbuf_detach(&buffer, &last->len);
 351         last->buf = last->buf_alloc;
 352
 353         strbuf_addf(&exp, "application/x-%s-advertisement", service);
 354         if (maybe_smart &&
 355             (5 <= last->len && last->buf[4] == '#') &&
 356             !strbuf_cmp(&exp, &type)) {
 357                 char *line;
 358
 359                 /*
 360                  * smart HTTP response; validate that the service
 361                  * pkt-line matches our request.
 362                  */
 363                 line = packet_read_line_buf(&last->buf, &last->len, NULL);
 364
 365                 strbuf_reset(&exp);
 366                 strbuf_addf(&exp, "# service=%s", service);
 367                 if (strcmp(line, exp.buf))
 368                         die("invalid server response; got '%s'", line);
 369                 strbuf_release(&exp);
 370
 371                 /* The header can include additional metadata lines, up
 372                  * until a packet flush marker.  Ignore these now, but
 373                  * in the future we might start to scan them.
 374                  */
 375                 while (packet_read_line_buf(&last->buf, &last->len, NULL))
 376                         ;
 377
 378                 last->proto_git = 1;
 379         }
 380
 381         if (last->proto_git)
 382                 last->refs = parse_git_refs(last, for_push);
 383         else
 384                 last->refs = parse_info_refs(last);
 385
 386         strbuf_release(&refs_url);
 387         strbuf_release(&exp);
 388         strbuf_release(&type);
 389         strbuf_release(&charset);
 390         strbuf_release(&effective_url);
 391         strbuf_release(&buffer);
 392         last_discovery = last;
 393         return last;
 394 }
 395
 396 static struct ref *get_refs(int for_push)
 397 {
 398         struct discovery *heads;
 399
 400         if (for_push)
 401                 heads = discover_refs("git-receive-pack", for_push);
 402         else
 403                 heads = discover_refs("git-upload-pack", for_push);
 404
 405         return heads->refs;
 406 }
 407
 408 static void output_refs(struct ref *refs)
 409 {
 410         struct ref *posn;
 411         for (posn = refs; posn; posn = posn->next) {
 412                 if (posn->symref)
 413                         printf("@%s %s\n", posn->symref, posn->name);
 414                 else
 415                         printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name);
 416         }
 417         printf("\n");
 418         fflush(stdout);
 419 }
 420
 421 struct rpc_state {
 422         const char *service_name;
 423         const char **argv;
 424         struct strbuf *stdin_preamble;
 425         char *service_url;
 426         char *hdr_content_type;
 427         char *hdr_accept;
 428         char *buf;
 429         size_t alloc;
 430         size_t len;
 431         size_t pos;
 432         int in;
 433         int out;
 434         int any_written;
 435         struct strbuf result;
 436         unsigned gzip_request : 1;
 437         unsigned initial_buffer : 1;
 438 };
 439
 440 static size_t rpc_out(void *ptr, size_t eltsize,
 441                 size_t nmemb, void *buffer_)
 442 {
 443         size_t max = eltsize * nmemb;
 444         struct rpc_state *rpc = buffer_;
 445         size_t avail = rpc->len - rpc->pos;
 446
 447         if (!avail) {
 448                 rpc->initial_buffer = 0;
 449                 avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 450                 if (!avail)
 451                         return 0;
 452                 rpc->pos = 0;
 453                 rpc->len = avail;
 454         }
 455
 456         if (max < avail)
 457                 avail = max;
 458         memcpy(ptr, rpc->buf + rpc->pos, avail);
 459         rpc->pos += avail;
 460         return avail;
 461 }
 462
 463 #ifndef NO_CURL_IOCTL
 464 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 465 {
 466         struct rpc_state *rpc = clientp;
 467
 468         switch (cmd) {
 469         case CURLIOCMD_NOP:
 470                 return CURLIOE_OK;
 471
 472         case CURLIOCMD_RESTARTREAD:
 473                 if (rpc->initial_buffer) {
 474                         rpc->pos = 0;
 475                         return CURLIOE_OK;
 476                 }
 477                 error("unable to rewind rpc post data - try increasing http.postBuffer");
 478                 return CURLIOE_FAILRESTART;
 479
 480         default:
 481                 return CURLIOE_UNKNOWNCMD;
 482         }
 483 }
 484 #endif
 485
 486 static size_t rpc_in(char *ptr, size_t eltsize,
 487                 size_t nmemb, void *buffer_)
 488 {
 489         size_t size = eltsize * nmemb;
 490         struct rpc_state *rpc = buffer_;
 491         if (size)
 492                 rpc->any_written = 1;
 493         write_or_die(rpc->in, ptr, size);
 494         return size;
 495 }
 496
 497 static int run_slot(struct active_request_slot *slot,
 498                     struct slot_results *results)
 499 {
 500         int err;
 501         struct slot_results results_buf;
 502
 503         if (!results)
 504                 results = &results_buf;
 505
 506         err = run_one_slot(slot, results);
 507
 508         if (err != HTTP_OK && err != HTTP_REAUTH) {
 509                 struct strbuf msg = STRBUF_INIT;
 510                 if (results->http_code && results->http_code != 200)
 511                         strbuf_addf(&msg, "HTTP %ld", results->http_code);
 512                 if (results->curl_result != CURLE_OK) {
 513                         if (msg.len)
 514                                 strbuf_addch(&msg, ' ');
 515                         strbuf_addf(&msg, "curl %d", results->curl_result);
 516                         if (curl_errorstr[0]) {
 517                                 strbuf_addch(&msg, ' ');
 518                                 strbuf_addstr(&msg, curl_errorstr);
 519                         }
 520                 }
 521                 error("RPC failed; %s", msg.buf);
 522                 strbuf_release(&msg);
 523         }
 524
 525         return err;
 526 }
 527
 528 static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 529 {
 530         struct active_request_slot *slot;
 531         struct curl_slist *headers = http_copy_default_headers();
 532         struct strbuf buf = STRBUF_INIT;
 533         int err;
 534
 535         slot = get_active_slot();
 536
 537         headers = curl_slist_append(headers, rpc->hdr_content_type);
 538         headers = curl_slist_append(headers, rpc->hdr_accept);
 539
 540         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 541         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 542         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 543         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 544         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 545         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 546         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 547         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 548         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 549
 550         err = run_slot(slot, results);
 551
 552         curl_slist_free_all(headers);
 553         strbuf_release(&buf);
 554         return err;
 555 }
 556
 557 static curl_off_t xcurl_off_t(ssize_t len) {
 558         if (len > maximum_signed_value_of_type(curl_off_t))
 559                 die("cannot handle pushes this big");
 560         return (curl_off_t) len;
 561 }
 562
 563 static int post_rpc(struct rpc_state *rpc)
 564 {
 565         struct active_request_slot *slot;
 566         struct curl_slist *headers = http_copy_default_headers();
 567         int use_gzip = rpc->gzip_request;
 568         char *gzip_body = NULL;
 569         size_t gzip_size = 0;
 570         int err, large_request = 0;
 571         int needs_100_continue = 0;
 572
 573         /* Try to load the entire request, if we can fit it into the
 574          * allocated buffer space we can use HTTP/1.0 and avoid the
 575          * chunked encoding mess.
 576          */
 577         while (1) {
 578                 size_t left = rpc->alloc - rpc->len;
 579                 char *buf = rpc->buf + rpc->len;
 580                 int n;
 581
 582                 if (left < LARGE_PACKET_MAX) {
 583                         large_request = 1;
 584                         use_gzip = 0;
 585                         break;
 586                 }
 587
 588                 n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 589                 if (!n)
 590                         break;
 591                 rpc->len += n;
 592         }
 593
 594         if (large_request) {
 595                 struct slot_results results;
 596
 597                 do {
 598                         err = probe_rpc(rpc, &results);
 599                         if (err == HTTP_REAUTH)
 600                                 credential_fill(&http_auth);
 601                 } while (err == HTTP_REAUTH);
 602                 if (err != HTTP_OK)
 603                         return -1;
 604
 605                 if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 606                         needs_100_continue = 1;
 607         }
 608
 609         headers = curl_slist_append(headers, rpc->hdr_content_type);
 610         headers = curl_slist_append(headers, rpc->hdr_accept);
 611         headers = curl_slist_append(headers, needs_100_continue ?
 612                 "Expect: 100-continue" : "Expect:");
 613
 614 retry:
 615         slot = get_active_slot();
 616
 617         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 618         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 619         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 620         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 621
 622         if (large_request) {
 623                 /* The request body is large and the size cannot be predicted.
 624                  * We must use chunked encoding to send it.
 625                  */
 626                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 627                 rpc->initial_buffer = 1;
 628                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 629                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 630 #ifndef NO_CURL_IOCTL
 631                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 632                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 633 #endif
 634                 if (options.verbosity > 1) {
 635                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 636                         fflush(stderr);
 637                 }
 638
 639         } else if (gzip_body) {
 640                 /*
 641                  * If we are looping to retry authentication, then the previous
 642                  * run will have set up the headers and gzip buffer already,
 643                  * and we just need to send it.
 644                  */
 645                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 646                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 647
 648         } else if (use_gzip && 1024 < rpc->len) {
 649                 /* The client backend isn't giving us compressed data so
 650                  * we can try to deflate it ourselves, this may save on.
 651                  * the transfer time.
 652                  */
 653                 git_zstream stream;
 654                 int ret;
 655
 656                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 657                 gzip_size = git_deflate_bound(&stream, rpc->len);
 658                 gzip_body = xmalloc(gzip_size);
 659
 660                 stream.next_in = (unsigned char *)rpc->buf;
 661                 stream.avail_in = rpc->len;
 662                 stream.next_out = (unsigned char *)gzip_body;
 663                 stream.avail_out = gzip_size;
 664
 665                 ret = git_deflate(&stream, Z_FINISH);
 666                 if (ret != Z_STREAM_END)
 667                         die("cannot deflate request; zlib deflate error %d", ret);
 668
 669                 ret = git_deflate_end_gently(&stream);
 670                 if (ret != Z_OK)
 671                         die("cannot deflate request; zlib end error %d", ret);
 672
 673                 gzip_size = stream.total_out;
 674
 675                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 676                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 677                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 678
 679                 if (options.verbosity > 1) {
 680                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 681                                 rpc->service_name,
 682                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
 683                         fflush(stderr);
 684                 }
 685         } else {
 686                 /* We know the complete request size in advance, use the
 687                  * more normal Content-Length approach.
 688                  */
 689                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 690                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(rpc->len));
 691                 if (options.verbosity > 1) {
 692                         fprintf(stderr, "POST %s (%lu bytes)\n",
 693                                 rpc->service_name, (unsigned long)rpc->len);
 694                         fflush(stderr);
 695                 }
 696         }
 697
 698         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 699         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 700         curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 701
 702
 703         rpc->any_written = 0;
 704         err = run_slot(slot, NULL);
 705         if (err == HTTP_REAUTH && !large_request) {
 706                 credential_fill(&http_auth);
 707                 goto retry;
 708         }
 709         if (err != HTTP_OK)
 710                 err = -1;
 711
 712         if (!rpc->any_written)
 713                 err = -1;
 714
 715         curl_slist_free_all(headers);
 716         free(gzip_body);
 717         return err;
 718 }
 719
 720 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 721 {
 722         const char *svc = rpc->service_name;
 723         struct strbuf buf = STRBUF_INIT;
 724         struct strbuf *preamble = rpc->stdin_preamble;
 725         struct child_process client = CHILD_PROCESS_INIT;
 726         int err = 0;
 727
 728         client.in = -1;
 729         client.out = -1;
 730         client.git_cmd = 1;
 731         client.argv = rpc->argv;
 732         if (start_command(&client))
 733                 exit(1);
 734         if (preamble)
 735                 write_or_die(client.in, preamble->buf, preamble->len);
 736         if (heads)
 737                 write_or_die(client.in, heads->buf, heads->len);
 738
 739         rpc->alloc = http_post_buffer;
 740         rpc->buf = xmalloc(rpc->alloc);
 741         rpc->in = client.in;
 742         rpc->out = client.out;
 743         strbuf_init(&rpc->result, 0);
 744
 745         strbuf_addf(&buf, "%s%s", url.buf, svc);
 746         rpc->service_url = strbuf_detach(&buf, NULL);
 747
 748         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 749         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 750
 751         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 752         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 753
 754         while (!err) {
 755                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 756                 if (!n)
 757                         break;
 758                 rpc->pos = 0;
 759                 rpc->len = n;
 760                 err |= post_rpc(rpc);
 761         }
 762
 763         close(client.in);
 764         client.in = -1;
 765         if (!err) {
 766                 strbuf_read(&rpc->result, client.out, 0);
 767         } else {
 768                 char buf[4096];
 769                 for (;;)
 770                         if (xread(client.out, buf, sizeof(buf)) <= 0)
 771                                 break;
 772         }
 773
 774         close(client.out);
 775         client.out = -1;
 776
 777         err |= finish_command(&client);
 778         free(rpc->service_url);
 779         free(rpc->hdr_content_type);
 780         free(rpc->hdr_accept);
 781         free(rpc->buf);
 782         strbuf_release(&buf);
 783         return err;
 784 }
 785
 786 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 787 {
 788         struct walker *walker;
 789         char **targets;
 790         int ret, i;
 791
 792         ALLOC_ARRAY(targets, nr_heads);
 793         if (options.depth || options.deepen_since)
 794                 die("dumb http transport does not support shallow capabilities");
 795         for (i = 0; i < nr_heads; i++)
 796                 targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
 797
 798         walker = get_http_walker(url.buf);
 799         walker->get_all = 1;
 800         walker->get_tree = 1;
 801         walker->get_history = 1;
 802         walker->get_verbosely = options.verbosity >= 3;
 803         walker->get_recover = 0;
 804         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 805         walker_free(walker);
 806
 807         for (i = 0; i < nr_heads; i++)
 808                 free(targets[i]);
 809         free(targets);
 810
 811         return ret ? error("fetch failed.") : 0;
 812 }
 813
 814 static int fetch_git(struct discovery *heads,
 815         int nr_heads, struct ref **to_fetch)
 816 {
 817         struct rpc_state rpc;
 818         struct strbuf preamble = STRBUF_INIT;
 819         int i, err;
 820         struct argv_array args = ARGV_ARRAY_INIT;
 821
 822         argv_array_pushl(&args, "fetch-pack", "--stateless-rpc",
 823                          "--stdin", "--lock-pack", NULL);
 824         if (options.followtags)
 825                 argv_array_push(&args, "--include-tag");
 826         if (options.thin)
 827                 argv_array_push(&args, "--thin");
 828         if (options.verbosity >= 3)
 829                 argv_array_pushl(&args, "-v", "-v", NULL);
 830         if (options.check_self_contained_and_connected)
 831                 argv_array_push(&args, "--check-self-contained-and-connected");
 832         if (options.cloning)
 833                 argv_array_push(&args, "--cloning");
 834         if (options.update_shallow)
 835                 argv_array_push(&args, "--update-shallow");
 836         if (!options.progress)
 837                 argv_array_push(&args, "--no-progress");
 838         if (options.depth)
 839                 argv_array_pushf(&args, "--depth=%lu", options.depth);
 840         if (options.deepen_since)
 841                 argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since);
 842         for (i = 0; i < options.deepen_not.nr; i++)
 843                 argv_array_pushf(&args, "--shallow-exclude=%s",
 844                                  options.deepen_not.items[i].string);
 845         if (options.deepen_relative && options.depth)
 846                 argv_array_push(&args, "--deepen-relative");
 847         argv_array_push(&args, url.buf);
 848
 849         for (i = 0; i < nr_heads; i++) {
 850                 struct ref *ref = to_fetch[i];
 851                 if (!*ref->name)
 852                         die("cannot fetch by sha1 over smart http");
 853                 packet_buf_write(&preamble, "%s %s\n",
 854                                  oid_to_hex(&ref->old_oid), ref->name);
 855         }
 856         packet_buf_flush(&preamble);
 857
 858         memset(&rpc, 0, sizeof(rpc));
 859         rpc.service_name = "git-upload-pack",
 860         rpc.argv = args.argv;
 861         rpc.stdin_preamble = &preamble;
 862         rpc.gzip_request = 1;
 863
 864         err = rpc_service(&rpc, heads);
 865         if (rpc.result.len)
 866                 write_or_die(1, rpc.result.buf, rpc.result.len);
 867         strbuf_release(&rpc.result);
 868         strbuf_release(&preamble);
 869         argv_array_clear(&args);
 870         return err;
 871 }
 872
 873 static int fetch(int nr_heads, struct ref **to_fetch)
 874 {
 875         struct discovery *d = discover_refs("git-upload-pack", 0);
 876         if (d->proto_git)
 877                 return fetch_git(d, nr_heads, to_fetch);
 878         else
 879                 return fetch_dumb(nr_heads, to_fetch);
 880 }
 881
 882 static void parse_fetch(struct strbuf *buf)
 883 {
 884         struct ref **to_fetch = NULL;
 885         struct ref *list_head = NULL;
 886         struct ref **list = &list_head;
 887         int alloc_heads = 0, nr_heads = 0;
 888
 889         do {
 890                 const char *p;
 891                 if (skip_prefix(buf->buf, "fetch ", &p)) {
 892                         const char *name;
 893                         struct ref *ref;
 894                         struct object_id old_oid;
 895
 896                         if (get_oid_hex(p, &old_oid))
 897                                 die("protocol error: expected sha/ref, got %s'", p);
 898                         if (p[GIT_SHA1_HEXSZ] == ' ')
 899                                 name = p + GIT_SHA1_HEXSZ + 1;
 900                         else if (!p[GIT_SHA1_HEXSZ])
 901                                 name = "";
 902                         else
 903                                 die("protocol error: expected sha/ref, got %s'", p);
 904
 905                         ref = alloc_ref(name);
 906                         oidcpy(&ref->old_oid, &old_oid);
 907
 908                         *list = ref;
 909                         list = &ref->next;
 910
 911                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 912                         to_fetch[nr_heads++] = ref;
 913                 }
 914                 else
 915                         die("http transport does not support %s", buf->buf);
 916
 917                 strbuf_reset(buf);
 918                 if (strbuf_getline_lf(buf, stdin) == EOF)
 919                         return;
 920                 if (!*buf->buf)
 921                         break;
 922         } while (1);
 923
 924         if (fetch(nr_heads, to_fetch))
 925                 exit(128); /* error already reported */
 926         free_refs(list_head);
 927         free(to_fetch);
 928
 929         printf("\n");
 930         fflush(stdout);
 931         strbuf_reset(buf);
 932 }
 933
 934 static int push_dav(int nr_spec, char **specs)
 935 {
 936         struct child_process child = CHILD_PROCESS_INIT;
 937         size_t i;
 938
 939         child.git_cmd = 1;
 940         argv_array_push(&child.args, "http-push");
 941         argv_array_push(&child.args, "--helper-status");
 942         if (options.dry_run)
 943                 argv_array_push(&child.args, "--dry-run");
 944         if (options.verbosity > 1)
 945                 argv_array_push(&child.args, "--verbose");
 946         argv_array_push(&child.args, url.buf);
 947         for (i = 0; i < nr_spec; i++)
 948                 argv_array_push(&child.args, specs[i]);
 949
 950         if (run_command(&child))
 951                 die("git-http-push failed");
 952         return 0;
 953 }
 954
 955 static int push_git(struct discovery *heads, int nr_spec, char **specs)
 956 {
 957         struct rpc_state rpc;
 958         int i, err;
 959         struct argv_array args;
 960         struct string_list_item *cas_option;
 961         struct strbuf preamble = STRBUF_INIT;
 962
 963         argv_array_init(&args);
 964         argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 965                          NULL);
 966
 967         if (options.thin)
 968                 argv_array_push(&args, "--thin");
 969         if (options.dry_run)
 970                 argv_array_push(&args, "--dry-run");
 971         if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
 972                 argv_array_push(&args, "--signed=yes");
 973         else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
 974                 argv_array_push(&args, "--signed=if-asked");
 975         if (options.verbosity == 0)
 976                 argv_array_push(&args, "--quiet");
 977         else if (options.verbosity > 1)
 978                 argv_array_push(&args, "--verbose");
 979         for (i = 0; i < options.push_options.nr; i++)
 980                 argv_array_pushf(&args, "--push-option=%s",
 981                                  options.push_options.items[i].string);
 982         argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 983         for_each_string_list_item(cas_option, &cas_options)
 984                 argv_array_push(&args, cas_option->string);
 985         argv_array_push(&args, url.buf);
 986
 987         argv_array_push(&args, "--stdin");
 988         for (i = 0; i < nr_spec; i++)
 989                 packet_buf_write(&preamble, "%s\n", specs[i]);
 990         packet_buf_flush(&preamble);
 991
 992         memset(&rpc, 0, sizeof(rpc));
 993         rpc.service_name = "git-receive-pack",
 994         rpc.argv = args.argv;
 995         rpc.stdin_preamble = &preamble;
 996
 997         err = rpc_service(&rpc, heads);
 998         if (rpc.result.len)
 999                 write_or_die(1, rpc.result.buf, rpc.result.len);
1000         strbuf_release(&rpc.result);
1001         strbuf_release(&preamble);
1002         argv_array_clear(&args);
1003         return err;
1004 }
1005
1006 static int push(int nr_spec, char **specs)
1007 {
1008         struct discovery *heads = discover_refs("git-receive-pack", 1);
1009         int ret;
1010
1011         if (heads->proto_git)
1012                 ret = push_git(heads, nr_spec, specs);
1013         else
1014                 ret = push_dav(nr_spec, specs);
1015         free_discovery(heads);
1016         return ret;
1017 }
1018
1019 static void parse_push(struct strbuf *buf)
1020 {
1021         char **specs = NULL;
1022         int alloc_spec = 0, nr_spec = 0, i, ret;
1023
1024         do {
1025                 if (starts_with(buf->buf, "push ")) {
1026                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
1027                         specs[nr_spec++] = xstrdup(buf->buf + 5);
1028                 }
1029                 else
1030                         die("http transport does not support %s", buf->buf);
1031
1032                 strbuf_reset(buf);
1033                 if (strbuf_getline_lf(buf, stdin) == EOF)
1034                         goto free_specs;
1035                 if (!*buf->buf)
1036                         break;
1037         } while (1);
1038
1039         ret = push(nr_spec, specs);
1040         printf("\n");
1041         fflush(stdout);
1042
1043         if (ret)
1044                 exit(128); /* error already reported */
1045
1046  free_specs:
1047         for (i = 0; i < nr_spec; i++)
1048                 free(specs[i]);
1049         free(specs);
1050 }
1051
1052 int cmd_main(int argc, const char **argv)
1053 {
1054         struct strbuf buf = STRBUF_INIT;
1055         int nongit;
1056
1057         setup_git_directory_gently(&nongit);
1058         if (argc < 2) {
1059                 error("remote-curl: usage: git remote-curl <remote> [<url>]");
1060                 return 1;
1061         }
1062
1063         options.verbosity = 1;
1064         options.progress = !!isatty(2);
1065         options.thin = 1;
1066         string_list_init(&options.deepen_not, 1);
1067         string_list_init(&options.push_options, 1);
1068
1069         remote = remote_get(argv[1]);
1070
1071         if (argc > 2) {
1072                 end_url_with_slash(&url, argv[2]);
1073         } else {
1074                 end_url_with_slash(&url, remote->url[0]);
1075         }
1076
1077         http_init(remote, url.buf, 0);
1078
1079         do {
1080                 const char *arg;
1081
1082                 if (strbuf_getline_lf(&buf, stdin) == EOF) {
1083                         if (ferror(stdin))
1084                                 error("remote-curl: error reading command stream from git");
1085                         return 1;
1086                 }
1087                 if (buf.len == 0)
1088                         break;
1089                 if (starts_with(buf.buf, "fetch ")) {
1090                         if (nongit)
1091                                 die("remote-curl: fetch attempted without a local repo");
1092                         parse_fetch(&buf);
1093
1094                 } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1095                         int for_push = !!strstr(buf.buf + 4, "for-push");
1096                         output_refs(get_refs(for_push));
1097
1098                 } else if (starts_with(buf.buf, "push ")) {
1099                         parse_push(&buf);
1100
1101                 } else if (skip_prefix(buf.buf, "option ", &arg)) {
1102                         char *value = strchr(arg, ' ');
1103                         int result;
1104
1105                         if (value)
1106                                 *value++ = '\0';
1107                         else
1108                                 value = "true";
1109
1110                         result = set_option(arg, value);
1111                         if (!result)
1112                                 printf("ok\n");
1113                         else if (result < 0)
1114                                 printf("error invalid value\n");
1115                         else
1116                                 printf("unsupported\n");
1117                         fflush(stdout);
1118
1119                 } else if (!strcmp(buf.buf, "capabilities")) {
1120                         printf("fetch\n");
1121                         printf("option\n");
1122                         printf("push\n");
1123                         printf("check-connectivity\n");
1124                         printf("\n");
1125                         fflush(stdout);
1126                 } else {
1127                         error("remote-curl: unknown command '%s' from git", buf.buf);
1128                         return 1;
1129                 }
1130                 strbuf_reset(&buf);
1131         } while (1);
1132
1133         http_cleanup();
1134
1135         return 0;
1136 }