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