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         const char *service;
 169         char *buf_alloc;
 170         char *buf;
 171         size_t len;
 172         struct ref *refs;
 173         struct oid_array shallow;
 174         unsigned proto_git : 1;
 175 };
 176 static struct discovery *last_discovery;
 177
 178 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 179 {
 180         struct ref *list = NULL;
 181         struct packet_reader reader;
 182
 183         packet_reader_init(&reader, -1, heads->buf, heads->len,
 184                            PACKET_READ_CHOMP_NEWLINE |
 185                            PACKET_READ_GENTLE_ON_EOF);
 186
 187         switch (discover_version(&reader)) {
 188         case protocol_v1:
 189         case protocol_v0:
 190                 get_remote_heads(&reader, &list, for_push ? REF_NORMAL : 0,
 191                                  NULL, &heads->shallow);
 192                 break;
 193         case protocol_unknown_version:
 194                 BUG("unknown protocol version");
 195         }
 196
 197         return list;
 198 }
 199
 200 static struct ref *parse_info_refs(struct discovery *heads)
 201 {
 202         char *data, *start, *mid;
 203         char *ref_name;
 204         int i = 0;
 205
 206         struct ref *refs = NULL;
 207         struct ref *ref = NULL;
 208         struct ref *last_ref = NULL;
 209
 210         data = heads->buf;
 211         start = NULL;
 212         mid = data;
 213         while (i < heads->len) {
 214                 if (!start) {
 215                         start = &data[i];
 216                 }
 217                 if (data[i] == '\t')
 218                         mid = &data[i];
 219                 if (data[i] == '\n') {
 220                         if (mid - start != 40)
 221                                 die("%sinfo/refs not valid: is this a git repository?",
 222                                     url.buf);
 223                         data[i] = 0;
 224                         ref_name = mid + 1;
 225                         ref = alloc_ref(ref_name);
 226                         get_oid_hex(start, &ref->old_oid);
 227                         if (!refs)
 228                                 refs = ref;
 229                         if (last_ref)
 230                                 last_ref->next = ref;
 231                         last_ref = ref;
 232                         start = NULL;
 233                 }
 234                 i++;
 235         }
 236
 237         ref = alloc_ref("HEAD");
 238         if (!http_fetch_ref(url.buf, ref) &&
 239             !resolve_remote_symref(ref, refs)) {
 240                 ref->next = refs;
 241                 refs = ref;
 242         } else {
 243                 free(ref);
 244         }
 245
 246         return refs;
 247 }
 248
 249 static void free_discovery(struct discovery *d)
 250 {
 251         if (d) {
 252                 if (d == last_discovery)
 253                         last_discovery = NULL;
 254                 free(d->shallow.oid);
 255                 free(d->buf_alloc);
 256                 free_refs(d->refs);
 257                 free(d);
 258         }
 259 }
 260
 261 static int show_http_message(struct strbuf *type, struct strbuf *charset,
 262                              struct strbuf *msg)
 263 {
 264         const char *p, *eol;
 265
 266         /*
 267          * We only show text/plain parts, as other types are likely
 268          * to be ugly to look at on the user's terminal.
 269          */
 270         if (strcmp(type->buf, "text/plain"))
 271                 return -1;
 272         if (charset->len)
 273                 strbuf_reencode(msg, charset->buf, get_log_output_encoding());
 274
 275         strbuf_trim(msg);
 276         if (!msg->len)
 277                 return -1;
 278
 279         p = msg->buf;
 280         do {
 281                 eol = strchrnul(p, '\n');
 282                 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 283                 p = eol + 1;
 284         } while(*eol);
 285         return 0;
 286 }
 287
 288 static struct discovery *discover_refs(const char *service, int for_push)
 289 {
 290         struct strbuf exp = STRBUF_INIT;
 291         struct strbuf type = STRBUF_INIT;
 292         struct strbuf charset = STRBUF_INIT;
 293         struct strbuf buffer = STRBUF_INIT;
 294         struct strbuf refs_url = STRBUF_INIT;
 295         struct strbuf effective_url = STRBUF_INIT;
 296         struct discovery *last = last_discovery;
 297         int http_ret, maybe_smart = 0;
 298         struct http_get_options http_options;
 299
 300         if (last && !strcmp(service, last->service))
 301                 return last;
 302         free_discovery(last);
 303
 304         strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 305         if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 306              git_env_bool("GIT_SMART_HTTP", 1)) {
 307                 maybe_smart = 1;
 308                 if (!strchr(url.buf, '?'))
 309                         strbuf_addch(&refs_url, '?');
 310                 else
 311                         strbuf_addch(&refs_url, '&');
 312                 strbuf_addf(&refs_url, "service=%s", service);
 313         }
 314
 315         memset(&http_options, 0, sizeof(http_options));
 316         http_options.content_type = &type;
 317         http_options.charset = &charset;
 318         http_options.effective_url = &effective_url;
 319         http_options.base_url = &url;
 320         http_options.initial_request = 1;
 321         http_options.no_cache = 1;
 322         http_options.keep_error = 1;
 323
 324         http_ret = http_get_strbuf(refs_url.buf, &buffer, &http_options);
 325         switch (http_ret) {
 326         case HTTP_OK:
 327                 break;
 328         case HTTP_MISSING_TARGET:
 329                 show_http_message(&type, &charset, &buffer);
 330                 die("repository '%s' not found", url.buf);
 331         case HTTP_NOAUTH:
 332                 show_http_message(&type, &charset, &buffer);
 333                 die("Authentication failed for '%s'", url.buf);
 334         default:
 335                 show_http_message(&type, &charset, &buffer);
 336                 die("unable to access '%s': %s", url.buf, curl_errorstr);
 337         }
 338
 339         if (options.verbosity && !starts_with(refs_url.buf, url.buf))
 340                 warning(_("redirecting to %s"), url.buf);
 341
 342         last= xcalloc(1, sizeof(*last_discovery));
 343         last->service = service;
 344         last->buf_alloc = strbuf_detach(&buffer, &last->len);
 345         last->buf = last->buf_alloc;
 346
 347         strbuf_addf(&exp, "application/x-%s-advertisement", service);
 348         if (maybe_smart &&
 349             (5 <= last->len && last->buf[4] == '#') &&
 350             !strbuf_cmp(&exp, &type)) {
 351                 char *line;
 352
 353                 /*
 354                  * smart HTTP response; validate that the service
 355                  * pkt-line matches our request.
 356                  */
 357                 line = packet_read_line_buf(&last->buf, &last->len, NULL);
 358
 359                 strbuf_reset(&exp);
 360                 strbuf_addf(&exp, "# service=%s", service);
 361                 if (strcmp(line, exp.buf))
 362                         die("invalid server response; got '%s'", line);
 363                 strbuf_release(&exp);
 364
 365                 /* The header can include additional metadata lines, up
 366                  * until a packet flush marker.  Ignore these now, but
 367                  * in the future we might start to scan them.
 368                  */
 369                 while (packet_read_line_buf(&last->buf, &last->len, NULL))
 370                         ;
 371
 372                 last->proto_git = 1;
 373         }
 374
 375         if (last->proto_git)
 376                 last->refs = parse_git_refs(last, for_push);
 377         else
 378                 last->refs = parse_info_refs(last);
 379
 380         strbuf_release(&refs_url);
 381         strbuf_release(&exp);
 382         strbuf_release(&type);
 383         strbuf_release(&charset);
 384         strbuf_release(&effective_url);
 385         strbuf_release(&buffer);
 386         last_discovery = last;
 387         return last;
 388 }
 389
 390 static struct ref *get_refs(int for_push)
 391 {
 392         struct discovery *heads;
 393
 394         if (for_push)
 395                 heads = discover_refs("git-receive-pack", for_push);
 396         else
 397                 heads = discover_refs("git-upload-pack", for_push);
 398
 399         return heads->refs;
 400 }
 401
 402 static void output_refs(struct ref *refs)
 403 {
 404         struct ref *posn;
 405         for (posn = refs; posn; posn = posn->next) {
 406                 if (posn->symref)
 407                         printf("@%s %s\n", posn->symref, posn->name);
 408                 else
 409                         printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name);
 410         }
 411         printf("\n");
 412         fflush(stdout);
 413 }
 414
 415 struct rpc_state {
 416         const char *service_name;
 417         const char **argv;
 418         struct strbuf *stdin_preamble;
 419         char *service_url;
 420         char *hdr_content_type;
 421         char *hdr_accept;
 422         char *buf;
 423         size_t alloc;
 424         size_t len;
 425         size_t pos;
 426         int in;
 427         int out;
 428         int any_written;
 429         struct strbuf result;
 430         unsigned gzip_request : 1;
 431         unsigned initial_buffer : 1;
 432 };
 433
 434 static size_t rpc_out(void *ptr, size_t eltsize,
 435                 size_t nmemb, void *buffer_)
 436 {
 437         size_t max = eltsize * nmemb;
 438         struct rpc_state *rpc = buffer_;
 439         size_t avail = rpc->len - rpc->pos;
 440
 441         if (!avail) {
 442                 rpc->initial_buffer = 0;
 443                 avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 444                 if (!avail)
 445                         return 0;
 446                 rpc->pos = 0;
 447                 rpc->len = avail;
 448         }
 449
 450         if (max < avail)
 451                 avail = max;
 452         memcpy(ptr, rpc->buf + rpc->pos, avail);
 453         rpc->pos += avail;
 454         return avail;
 455 }
 456
 457 #ifndef NO_CURL_IOCTL
 458 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 459 {
 460         struct rpc_state *rpc = clientp;
 461
 462         switch (cmd) {
 463         case CURLIOCMD_NOP:
 464                 return CURLIOE_OK;
 465
 466         case CURLIOCMD_RESTARTREAD:
 467                 if (rpc->initial_buffer) {
 468                         rpc->pos = 0;
 469                         return CURLIOE_OK;
 470                 }
 471                 error("unable to rewind rpc post data - try increasing http.postBuffer");
 472                 return CURLIOE_FAILRESTART;
 473
 474         default:
 475                 return CURLIOE_UNKNOWNCMD;
 476         }
 477 }
 478 #endif
 479
 480 static size_t rpc_in(char *ptr, size_t eltsize,
 481                 size_t nmemb, void *buffer_)
 482 {
 483         size_t size = eltsize * nmemb;
 484         struct rpc_state *rpc = buffer_;
 485         if (size)
 486                 rpc->any_written = 1;
 487         write_or_die(rpc->in, ptr, size);
 488         return size;
 489 }
 490
 491 static int run_slot(struct active_request_slot *slot,
 492                     struct slot_results *results)
 493 {
 494         int err;
 495         struct slot_results results_buf;
 496
 497         if (!results)
 498                 results = &results_buf;
 499
 500         err = run_one_slot(slot, results);
 501
 502         if (err != HTTP_OK && err != HTTP_REAUTH) {
 503                 struct strbuf msg = STRBUF_INIT;
 504                 if (results->http_code && results->http_code != 200)
 505                         strbuf_addf(&msg, "HTTP %ld", results->http_code);
 506                 if (results->curl_result != CURLE_OK) {
 507                         if (msg.len)
 508                                 strbuf_addch(&msg, ' ');
 509                         strbuf_addf(&msg, "curl %d", results->curl_result);
 510                         if (curl_errorstr[0]) {
 511                                 strbuf_addch(&msg, ' ');
 512                                 strbuf_addstr(&msg, curl_errorstr);
 513                         }
 514                 }
 515                 error("RPC failed; %s", msg.buf);
 516                 strbuf_release(&msg);
 517         }
 518
 519         return err;
 520 }
 521
 522 static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 523 {
 524         struct active_request_slot *slot;
 525         struct curl_slist *headers = http_copy_default_headers();
 526         struct strbuf buf = STRBUF_INIT;
 527         int err;
 528
 529         slot = get_active_slot();
 530
 531         headers = curl_slist_append(headers, rpc->hdr_content_type);
 532         headers = curl_slist_append(headers, rpc->hdr_accept);
 533
 534         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 535         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 536         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 537         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 538         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 539         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 540         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 541         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 542         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 543
 544         err = run_slot(slot, results);
 545
 546         curl_slist_free_all(headers);
 547         strbuf_release(&buf);
 548         return err;
 549 }
 550
 551 static curl_off_t xcurl_off_t(ssize_t len) {
 552         if (len > maximum_signed_value_of_type(curl_off_t))
 553                 die("cannot handle pushes this big");
 554         return (curl_off_t) len;
 555 }
 556
 557 static int post_rpc(struct rpc_state *rpc)
 558 {
 559         struct active_request_slot *slot;
 560         struct curl_slist *headers = http_copy_default_headers();
 561         int use_gzip = rpc->gzip_request;
 562         char *gzip_body = NULL;
 563         size_t gzip_size = 0;
 564         int err, large_request = 0;
 565         int needs_100_continue = 0;
 566
 567         /* Try to load the entire request, if we can fit it into the
 568          * allocated buffer space we can use HTTP/1.0 and avoid the
 569          * chunked encoding mess.
 570          */
 571         while (1) {
 572                 size_t left = rpc->alloc - rpc->len;
 573                 char *buf = rpc->buf + rpc->len;
 574                 int n;
 575
 576                 if (left < LARGE_PACKET_MAX) {
 577                         large_request = 1;
 578                         use_gzip = 0;
 579                         break;
 580                 }
 581
 582                 n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 583                 if (!n)
 584                         break;
 585                 rpc->len += n;
 586         }
 587
 588         if (large_request) {
 589                 struct slot_results results;
 590
 591                 do {
 592                         err = probe_rpc(rpc, &results);
 593                         if (err == HTTP_REAUTH)
 594                                 credential_fill(&http_auth);
 595                 } while (err == HTTP_REAUTH);
 596                 if (err != HTTP_OK)
 597                         return -1;
 598
 599                 if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 600                         needs_100_continue = 1;
 601         }
 602
 603         headers = curl_slist_append(headers, rpc->hdr_content_type);
 604         headers = curl_slist_append(headers, rpc->hdr_accept);
 605         headers = curl_slist_append(headers, needs_100_continue ?
 606                 "Expect: 100-continue" : "Expect:");
 607
 608 retry:
 609         slot = get_active_slot();
 610
 611         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 612         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 613         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 614         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 615
 616         if (large_request) {
 617                 /* The request body is large and the size cannot be predicted.
 618                  * We must use chunked encoding to send it.
 619                  */
 620                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 621                 rpc->initial_buffer = 1;
 622                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 623                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 624 #ifndef NO_CURL_IOCTL
 625                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 626                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 627 #endif
 628                 if (options.verbosity > 1) {
 629                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 630                         fflush(stderr);
 631                 }
 632
 633         } else if (gzip_body) {
 634                 /*
 635                  * If we are looping to retry authentication, then the previous
 636                  * run will have set up the headers and gzip buffer already,
 637                  * and we just need to send it.
 638                  */
 639                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 640                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 641
 642         } else if (use_gzip && 1024 < rpc->len) {
 643                 /* The client backend isn't giving us compressed data so
 644                  * we can try to deflate it ourselves, this may save on.
 645                  * the transfer time.
 646                  */
 647                 git_zstream stream;
 648                 int ret;
 649
 650                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 651                 gzip_size = git_deflate_bound(&stream, rpc->len);
 652                 gzip_body = xmalloc(gzip_size);
 653
 654                 stream.next_in = (unsigned char *)rpc->buf;
 655                 stream.avail_in = rpc->len;
 656                 stream.next_out = (unsigned char *)gzip_body;
 657                 stream.avail_out = gzip_size;
 658
 659                 ret = git_deflate(&stream, Z_FINISH);
 660                 if (ret != Z_STREAM_END)
 661                         die("cannot deflate request; zlib deflate error %d", ret);
 662
 663                 ret = git_deflate_end_gently(&stream);
 664                 if (ret != Z_OK)
 665                         die("cannot deflate request; zlib end error %d", ret);
 666
 667                 gzip_size = stream.total_out;
 668
 669                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 670                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 671                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 672
 673                 if (options.verbosity > 1) {
 674                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 675                                 rpc->service_name,
 676                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
 677                         fflush(stderr);
 678                 }
 679         } else {
 680                 /* We know the complete request size in advance, use the
 681                  * more normal Content-Length approach.
 682                  */
 683                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 684                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(rpc->len));
 685                 if (options.verbosity > 1) {
 686                         fprintf(stderr, "POST %s (%lu bytes)\n",
 687                                 rpc->service_name, (unsigned long)rpc->len);
 688                         fflush(stderr);
 689                 }
 690         }
 691
 692         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 693         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 694         curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 695
 696
 697         rpc->any_written = 0;
 698         err = run_slot(slot, NULL);
 699         if (err == HTTP_REAUTH && !large_request) {
 700                 credential_fill(&http_auth);
 701                 goto retry;
 702         }
 703         if (err != HTTP_OK)
 704                 err = -1;
 705
 706         if (!rpc->any_written)
 707                 err = -1;
 708
 709         curl_slist_free_all(headers);
 710         free(gzip_body);
 711         return err;
 712 }
 713
 714 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 715 {
 716         const char *svc = rpc->service_name;
 717         struct strbuf buf = STRBUF_INIT;
 718         struct strbuf *preamble = rpc->stdin_preamble;
 719         struct child_process client = CHILD_PROCESS_INIT;
 720         int err = 0;
 721
 722         client.in = -1;
 723         client.out = -1;
 724         client.git_cmd = 1;
 725         client.argv = rpc->argv;
 726         if (start_command(&client))
 727                 exit(1);
 728         if (preamble)
 729                 write_or_die(client.in, preamble->buf, preamble->len);
 730         if (heads)
 731                 write_or_die(client.in, heads->buf, heads->len);
 732
 733         rpc->alloc = http_post_buffer;
 734         rpc->buf = xmalloc(rpc->alloc);
 735         rpc->in = client.in;
 736         rpc->out = client.out;
 737         strbuf_init(&rpc->result, 0);
 738
 739         strbuf_addf(&buf, "%s%s", url.buf, svc);
 740         rpc->service_url = strbuf_detach(&buf, NULL);
 741
 742         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 743         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 744
 745         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 746         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 747
 748         while (!err) {
 749                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 750                 if (!n)
 751                         break;
 752                 rpc->pos = 0;
 753                 rpc->len = n;
 754                 err |= post_rpc(rpc);
 755         }
 756
 757         close(client.in);
 758         client.in = -1;
 759         if (!err) {
 760                 strbuf_read(&rpc->result, client.out, 0);
 761         } else {
 762                 char buf[4096];
 763                 for (;;)
 764                         if (xread(client.out, buf, sizeof(buf)) <= 0)
 765                                 break;
 766         }
 767
 768         close(client.out);
 769         client.out = -1;
 770
 771         err |= finish_command(&client);
 772         free(rpc->service_url);
 773         free(rpc->hdr_content_type);
 774         free(rpc->hdr_accept);
 775         free(rpc->buf);
 776         strbuf_release(&buf);
 777         return err;
 778 }
 779
 780 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 781 {
 782         struct walker *walker;
 783         char **targets;
 784         int ret, i;
 785
 786         ALLOC_ARRAY(targets, nr_heads);
 787         if (options.depth || options.deepen_since)
 788                 die("dumb http transport does not support shallow capabilities");
 789         for (i = 0; i < nr_heads; i++)
 790                 targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
 791
 792         walker = get_http_walker(url.buf);
 793         walker->get_all = 1;
 794         walker->get_tree = 1;
 795         walker->get_history = 1;
 796         walker->get_verbosely = options.verbosity >= 3;
 797         walker->get_recover = 0;
 798         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 799         walker_free(walker);
 800
 801         for (i = 0; i < nr_heads; i++)
 802                 free(targets[i]);
 803         free(targets);
 804
 805         return ret ? error("fetch failed.") : 0;
 806 }
 807
 808 static int fetch_git(struct discovery *heads,
 809         int nr_heads, struct ref **to_fetch)
 810 {
 811         struct rpc_state rpc;
 812         struct strbuf preamble = STRBUF_INIT;
 813         int i, err;
 814         struct argv_array args = ARGV_ARRAY_INIT;
 815
 816         argv_array_pushl(&args, "fetch-pack", "--stateless-rpc",
 817                          "--stdin", "--lock-pack", NULL);
 818         if (options.followtags)
 819                 argv_array_push(&args, "--include-tag");
 820         if (options.thin)
 821                 argv_array_push(&args, "--thin");
 822         if (options.verbosity >= 3)
 823                 argv_array_pushl(&args, "-v", "-v", NULL);
 824         if (options.check_self_contained_and_connected)
 825                 argv_array_push(&args, "--check-self-contained-and-connected");
 826         if (options.cloning)
 827                 argv_array_push(&args, "--cloning");
 828         if (options.update_shallow)
 829                 argv_array_push(&args, "--update-shallow");
 830         if (!options.progress)
 831                 argv_array_push(&args, "--no-progress");
 832         if (options.depth)
 833                 argv_array_pushf(&args, "--depth=%lu", options.depth);
 834         if (options.deepen_since)
 835                 argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since);
 836         for (i = 0; i < options.deepen_not.nr; i++)
 837                 argv_array_pushf(&args, "--shallow-exclude=%s",
 838                                  options.deepen_not.items[i].string);
 839         if (options.deepen_relative && options.depth)
 840                 argv_array_push(&args, "--deepen-relative");
 841         argv_array_push(&args, url.buf);
 842
 843         for (i = 0; i < nr_heads; i++) {
 844                 struct ref *ref = to_fetch[i];
 845                 if (!*ref->name)
 846                         die("cannot fetch by sha1 over smart http");
 847                 packet_buf_write(&preamble, "%s %s\n",
 848                                  oid_to_hex(&ref->old_oid), ref->name);
 849         }
 850         packet_buf_flush(&preamble);
 851
 852         memset(&rpc, 0, sizeof(rpc));
 853         rpc.service_name = "git-upload-pack",
 854         rpc.argv = args.argv;
 855         rpc.stdin_preamble = &preamble;
 856         rpc.gzip_request = 1;
 857
 858         err = rpc_service(&rpc, heads);
 859         if (rpc.result.len)
 860                 write_or_die(1, rpc.result.buf, rpc.result.len);
 861         strbuf_release(&rpc.result);
 862         strbuf_release(&preamble);
 863         argv_array_clear(&args);
 864         return err;
 865 }
 866
 867 static int fetch(int nr_heads, struct ref **to_fetch)
 868 {
 869         struct discovery *d = discover_refs("git-upload-pack", 0);
 870         if (d->proto_git)
 871                 return fetch_git(d, nr_heads, to_fetch);
 872         else
 873                 return fetch_dumb(nr_heads, to_fetch);
 874 }
 875
 876 static void parse_fetch(struct strbuf *buf)
 877 {
 878         struct ref **to_fetch = NULL;
 879         struct ref *list_head = NULL;
 880         struct ref **list = &list_head;
 881         int alloc_heads = 0, nr_heads = 0;
 882
 883         do {
 884                 const char *p;
 885                 if (skip_prefix(buf->buf, "fetch ", &p)) {
 886                         const char *name;
 887                         struct ref *ref;
 888                         struct object_id old_oid;
 889
 890                         if (get_oid_hex(p, &old_oid))
 891                                 die("protocol error: expected sha/ref, got %s'", p);
 892                         if (p[GIT_SHA1_HEXSZ] == ' ')
 893                                 name = p + GIT_SHA1_HEXSZ + 1;
 894                         else if (!p[GIT_SHA1_HEXSZ])
 895                                 name = "";
 896                         else
 897                                 die("protocol error: expected sha/ref, got %s'", p);
 898
 899                         ref = alloc_ref(name);
 900                         oidcpy(&ref->old_oid, &old_oid);
 901
 902                         *list = ref;
 903                         list = &ref->next;
 904
 905                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 906                         to_fetch[nr_heads++] = ref;
 907                 }
 908                 else
 909                         die("http transport does not support %s", buf->buf);
 910
 911                 strbuf_reset(buf);
 912                 if (strbuf_getline_lf(buf, stdin) == EOF)
 913                         return;
 914                 if (!*buf->buf)
 915                         break;
 916         } while (1);
 917
 918         if (fetch(nr_heads, to_fetch))
 919                 exit(128); /* error already reported */
 920         free_refs(list_head);
 921         free(to_fetch);
 922
 923         printf("\n");
 924         fflush(stdout);
 925         strbuf_reset(buf);
 926 }
 927
 928 static int push_dav(int nr_spec, char **specs)
 929 {
 930         struct child_process child = CHILD_PROCESS_INIT;
 931         size_t i;
 932
 933         child.git_cmd = 1;
 934         argv_array_push(&child.args, "http-push");
 935         argv_array_push(&child.args, "--helper-status");
 936         if (options.dry_run)
 937                 argv_array_push(&child.args, "--dry-run");
 938         if (options.verbosity > 1)
 939                 argv_array_push(&child.args, "--verbose");
 940         argv_array_push(&child.args, url.buf);
 941         for (i = 0; i < nr_spec; i++)
 942                 argv_array_push(&child.args, specs[i]);
 943
 944         if (run_command(&child))
 945                 die("git-http-push failed");
 946         return 0;
 947 }
 948
 949 static int push_git(struct discovery *heads, int nr_spec, char **specs)
 950 {
 951         struct rpc_state rpc;
 952         int i, err;
 953         struct argv_array args;
 954         struct string_list_item *cas_option;
 955         struct strbuf preamble = STRBUF_INIT;
 956
 957         argv_array_init(&args);
 958         argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 959                          NULL);
 960
 961         if (options.thin)
 962                 argv_array_push(&args, "--thin");
 963         if (options.dry_run)
 964                 argv_array_push(&args, "--dry-run");
 965         if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
 966                 argv_array_push(&args, "--signed=yes");
 967         else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
 968                 argv_array_push(&args, "--signed=if-asked");
 969         if (options.verbosity == 0)
 970                 argv_array_push(&args, "--quiet");
 971         else if (options.verbosity > 1)
 972                 argv_array_push(&args, "--verbose");
 973         for (i = 0; i < options.push_options.nr; i++)
 974                 argv_array_pushf(&args, "--push-option=%s",
 975                                  options.push_options.items[i].string);
 976         argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 977         for_each_string_list_item(cas_option, &cas_options)
 978                 argv_array_push(&args, cas_option->string);
 979         argv_array_push(&args, url.buf);
 980
 981         argv_array_push(&args, "--stdin");
 982         for (i = 0; i < nr_spec; i++)
 983                 packet_buf_write(&preamble, "%s\n", specs[i]);
 984         packet_buf_flush(&preamble);
 985
 986         memset(&rpc, 0, sizeof(rpc));
 987         rpc.service_name = "git-receive-pack",
 988         rpc.argv = args.argv;
 989         rpc.stdin_preamble = &preamble;
 990
 991         err = rpc_service(&rpc, heads);
 992         if (rpc.result.len)
 993                 write_or_die(1, rpc.result.buf, rpc.result.len);
 994         strbuf_release(&rpc.result);
 995         strbuf_release(&preamble);
 996         argv_array_clear(&args);
 997         return err;
 998 }
 999
1000 static int push(int nr_spec, char **specs)
1001 {
1002         struct discovery *heads = discover_refs("git-receive-pack", 1);
1003         int ret;
1004
1005         if (heads->proto_git)
1006                 ret = push_git(heads, nr_spec, specs);
1007         else
1008                 ret = push_dav(nr_spec, specs);
1009         free_discovery(heads);
1010         return ret;
1011 }
1012
1013 static void parse_push(struct strbuf *buf)
1014 {
1015         char **specs = NULL;
1016         int alloc_spec = 0, nr_spec = 0, i, ret;
1017
1018         do {
1019                 if (starts_with(buf->buf, "push ")) {
1020                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
1021                         specs[nr_spec++] = xstrdup(buf->buf + 5);
1022                 }
1023                 else
1024                         die("http transport does not support %s", buf->buf);
1025
1026                 strbuf_reset(buf);
1027                 if (strbuf_getline_lf(buf, stdin) == EOF)
1028                         goto free_specs;
1029                 if (!*buf->buf)
1030                         break;
1031         } while (1);
1032
1033         ret = push(nr_spec, specs);
1034         printf("\n");
1035         fflush(stdout);
1036
1037         if (ret)
1038                 exit(128); /* error already reported */
1039
1040  free_specs:
1041         for (i = 0; i < nr_spec; i++)
1042                 free(specs[i]);
1043         free(specs);
1044 }
1045
1046 int cmd_main(int argc, const char **argv)
1047 {
1048         struct strbuf buf = STRBUF_INIT;
1049         int nongit;
1050
1051         setup_git_directory_gently(&nongit);
1052         if (argc < 2) {
1053                 error("remote-curl: usage: git remote-curl <remote> [<url>]");
1054                 return 1;
1055         }
1056
1057         options.verbosity = 1;
1058         options.progress = !!isatty(2);
1059         options.thin = 1;
1060         string_list_init(&options.deepen_not, 1);
1061         string_list_init(&options.push_options, 1);
1062
1063         remote = remote_get(argv[1]);
1064
1065         if (argc > 2) {
1066                 end_url_with_slash(&url, argv[2]);
1067         } else {
1068                 end_url_with_slash(&url, remote->url[0]);
1069         }
1070
1071         http_init(remote, url.buf, 0);
1072
1073         do {
1074                 const char *arg;
1075
1076                 if (strbuf_getline_lf(&buf, stdin) == EOF) {
1077                         if (ferror(stdin))
1078                                 error("remote-curl: error reading command stream from git");
1079                         return 1;
1080                 }
1081                 if (buf.len == 0)
1082                         break;
1083                 if (starts_with(buf.buf, "fetch ")) {
1084                         if (nongit)
1085                                 die("remote-curl: fetch attempted without a local repo");
1086                         parse_fetch(&buf);
1087
1088                 } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1089                         int for_push = !!strstr(buf.buf + 4, "for-push");
1090                         output_refs(get_refs(for_push));
1091
1092                 } else if (starts_with(buf.buf, "push ")) {
1093                         parse_push(&buf);
1094
1095                 } else if (skip_prefix(buf.buf, "option ", &arg)) {
1096                         char *value = strchr(arg, ' ');
1097                         int result;
1098
1099                         if (value)
1100                                 *value++ = '\0';
1101                         else
1102                                 value = "true";
1103
1104                         result = set_option(arg, value);
1105                         if (!result)
1106                                 printf("ok\n");
1107                         else if (result < 0)
1108                                 printf("error invalid value\n");
1109                         else
1110                                 printf("unsupported\n");
1111                         fflush(stdout);
1112
1113                 } else if (!strcmp(buf.buf, "capabilities")) {
1114                         printf("fetch\n");
1115                         printf("option\n");
1116                         printf("push\n");
1117                         printf("check-connectivity\n");
1118                         printf("\n");
1119                         fflush(stdout);
1120                 } else {
1121                         error("remote-curl: unknown command '%s' from git", buf.buf);
1122                         return 1;
1123                 }
1124                 strbuf_reset(&buf);
1125         } while (1);
1126
1127         http_cleanup();
1128
1129         return 0;
1130 }