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 int get_protocol_http_header(enum protocol_version version,
 295                                     struct strbuf *header)
 296 {
 297         if (version > 0) {
 298                 strbuf_addf(header, GIT_PROTOCOL_HEADER ": version=%d",
 299                             version);
 300
 301                 return 1;
 302         }
 303
 304         return 0;
 305 }
 306
 307 static struct discovery *discover_refs(const char *service, int for_push)
 308 {
 309         struct strbuf exp = STRBUF_INIT;
 310         struct strbuf type = STRBUF_INIT;
 311         struct strbuf charset = STRBUF_INIT;
 312         struct strbuf buffer = STRBUF_INIT;
 313         struct strbuf refs_url = STRBUF_INIT;
 314         struct strbuf effective_url = STRBUF_INIT;
 315         struct strbuf protocol_header = STRBUF_INIT;
 316         struct string_list extra_headers = STRING_LIST_INIT_DUP;
 317         struct discovery *last = last_discovery;
 318         int http_ret, maybe_smart = 0;
 319         struct http_get_options http_options;
 320
 321         if (last && !strcmp(service, last->service))
 322                 return last;
 323         free_discovery(last);
 324
 325         strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 326         if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 327              git_env_bool("GIT_SMART_HTTP", 1)) {
 328                 maybe_smart = 1;
 329                 if (!strchr(url.buf, '?'))
 330                         strbuf_addch(&refs_url, '?');
 331                 else
 332                         strbuf_addch(&refs_url, '&');
 333                 strbuf_addf(&refs_url, "service=%s", service);
 334         }
 335
 336         /* Add the extra Git-Protocol header */
 337         if (get_protocol_http_header(get_protocol_version_config(), &protocol_header))
 338                 string_list_append(&extra_headers, protocol_header.buf);
 339
 340         memset(&http_options, 0, sizeof(http_options));
 341         http_options.content_type = &type;
 342         http_options.charset = &charset;
 343         http_options.effective_url = &effective_url;
 344         http_options.base_url = &url;
 345         http_options.extra_headers = &extra_headers;
 346         http_options.initial_request = 1;
 347         http_options.no_cache = 1;
 348         http_options.keep_error = 1;
 349
 350         http_ret = http_get_strbuf(refs_url.buf, &buffer, &http_options);
 351         switch (http_ret) {
 352         case HTTP_OK:
 353                 break;
 354         case HTTP_MISSING_TARGET:
 355                 show_http_message(&type, &charset, &buffer);
 356                 die("repository '%s' not found", url.buf);
 357         case HTTP_NOAUTH:
 358                 show_http_message(&type, &charset, &buffer);
 359                 die("Authentication failed for '%s'", url.buf);
 360         default:
 361                 show_http_message(&type, &charset, &buffer);
 362                 die("unable to access '%s': %s", url.buf, curl_errorstr);
 363         }
 364
 365         if (options.verbosity && !starts_with(refs_url.buf, url.buf))
 366                 warning(_("redirecting to %s"), url.buf);
 367
 368         last= xcalloc(1, sizeof(*last_discovery));
 369         last->service = xstrdup(service);
 370         last->buf_alloc = strbuf_detach(&buffer, &last->len);
 371         last->buf = last->buf_alloc;
 372
 373         strbuf_addf(&exp, "application/x-%s-advertisement", service);
 374         if (maybe_smart &&
 375             (5 <= last->len && last->buf[4] == '#') &&
 376             !strbuf_cmp(&exp, &type)) {
 377                 char *line;
 378
 379                 /*
 380                  * smart HTTP response; validate that the service
 381                  * pkt-line matches our request.
 382                  */
 383                 line = packet_read_line_buf(&last->buf, &last->len, NULL);
 384
 385                 strbuf_reset(&exp);
 386                 strbuf_addf(&exp, "# service=%s", service);
 387                 if (strcmp(line, exp.buf))
 388                         die("invalid server response; got '%s'", line);
 389                 strbuf_release(&exp);
 390
 391                 /* The header can include additional metadata lines, up
 392                  * until a packet flush marker.  Ignore these now, but
 393                  * in the future we might start to scan them.
 394                  */
 395                 while (packet_read_line_buf(&last->buf, &last->len, NULL))
 396                         ;
 397
 398                 last->proto_git = 1;
 399         } else if (maybe_smart &&
 400                    last->len > 5 && starts_with(last->buf + 4, "version 2")) {
 401                 last->proto_git = 1;
 402         }
 403
 404         if (last->proto_git)
 405                 last->refs = parse_git_refs(last, for_push);
 406         else
 407                 last->refs = parse_info_refs(last);
 408
 409         strbuf_release(&refs_url);
 410         strbuf_release(&exp);
 411         strbuf_release(&type);
 412         strbuf_release(&charset);
 413         strbuf_release(&effective_url);
 414         strbuf_release(&buffer);
 415         strbuf_release(&protocol_header);
 416         string_list_clear(&extra_headers, 0);
 417         last_discovery = last;
 418         return last;
 419 }
 420
 421 static struct ref *get_refs(int for_push)
 422 {
 423         struct discovery *heads;
 424
 425         if (for_push)
 426                 heads = discover_refs("git-receive-pack", for_push);
 427         else
 428                 heads = discover_refs("git-upload-pack", for_push);
 429
 430         return heads->refs;
 431 }
 432
 433 static void output_refs(struct ref *refs)
 434 {
 435         struct ref *posn;
 436         for (posn = refs; posn; posn = posn->next) {
 437                 if (posn->symref)
 438                         printf("@%s %s\n", posn->symref, posn->name);
 439                 else
 440                         printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name);
 441         }
 442         printf("\n");
 443         fflush(stdout);
 444 }
 445
 446 struct rpc_state {
 447         const char *service_name;
 448         const char **argv;
 449         struct strbuf *stdin_preamble;
 450         char *service_url;
 451         char *hdr_content_type;
 452         char *hdr_accept;
 453         char *protocol_header;
 454         char *buf;
 455         size_t alloc;
 456         size_t len;
 457         size_t pos;
 458         int in;
 459         int out;
 460         int any_written;
 461         struct strbuf result;
 462         unsigned gzip_request : 1;
 463         unsigned initial_buffer : 1;
 464 };
 465
 466 static size_t rpc_out(void *ptr, size_t eltsize,
 467                 size_t nmemb, void *buffer_)
 468 {
 469         size_t max = eltsize * nmemb;
 470         struct rpc_state *rpc = buffer_;
 471         size_t avail = rpc->len - rpc->pos;
 472
 473         if (!avail) {
 474                 rpc->initial_buffer = 0;
 475                 avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 476                 if (!avail)
 477                         return 0;
 478                 rpc->pos = 0;
 479                 rpc->len = avail;
 480         }
 481
 482         if (max < avail)
 483                 avail = max;
 484         memcpy(ptr, rpc->buf + rpc->pos, avail);
 485         rpc->pos += avail;
 486         return avail;
 487 }
 488
 489 #ifndef NO_CURL_IOCTL
 490 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 491 {
 492         struct rpc_state *rpc = clientp;
 493
 494         switch (cmd) {
 495         case CURLIOCMD_NOP:
 496                 return CURLIOE_OK;
 497
 498         case CURLIOCMD_RESTARTREAD:
 499                 if (rpc->initial_buffer) {
 500                         rpc->pos = 0;
 501                         return CURLIOE_OK;
 502                 }
 503                 error("unable to rewind rpc post data - try increasing http.postBuffer");
 504                 return CURLIOE_FAILRESTART;
 505
 506         default:
 507                 return CURLIOE_UNKNOWNCMD;
 508         }
 509 }
 510 #endif
 511
 512 static size_t rpc_in(char *ptr, size_t eltsize,
 513                 size_t nmemb, void *buffer_)
 514 {
 515         size_t size = eltsize * nmemb;
 516         struct rpc_state *rpc = buffer_;
 517         if (size)
 518                 rpc->any_written = 1;
 519         write_or_die(rpc->in, ptr, size);
 520         return size;
 521 }
 522
 523 static int run_slot(struct active_request_slot *slot,
 524                     struct slot_results *results)
 525 {
 526         int err;
 527         struct slot_results results_buf;
 528
 529         if (!results)
 530                 results = &results_buf;
 531
 532         err = run_one_slot(slot, results);
 533
 534         if (err != HTTP_OK && err != HTTP_REAUTH) {
 535                 struct strbuf msg = STRBUF_INIT;
 536                 if (results->http_code && results->http_code != 200)
 537                         strbuf_addf(&msg, "HTTP %ld", results->http_code);
 538                 if (results->curl_result != CURLE_OK) {
 539                         if (msg.len)
 540                                 strbuf_addch(&msg, ' ');
 541                         strbuf_addf(&msg, "curl %d", results->curl_result);
 542                         if (curl_errorstr[0]) {
 543                                 strbuf_addch(&msg, ' ');
 544                                 strbuf_addstr(&msg, curl_errorstr);
 545                         }
 546                 }
 547                 error("RPC failed; %s", msg.buf);
 548                 strbuf_release(&msg);
 549         }
 550
 551         return err;
 552 }
 553
 554 static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 555 {
 556         struct active_request_slot *slot;
 557         struct curl_slist *headers = http_copy_default_headers();
 558         struct strbuf buf = STRBUF_INIT;
 559         int err;
 560
 561         slot = get_active_slot();
 562
 563         headers = curl_slist_append(headers, rpc->hdr_content_type);
 564         headers = curl_slist_append(headers, rpc->hdr_accept);
 565
 566         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 567         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 568         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 569         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 570         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 571         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 572         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 573         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 574         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 575
 576         err = run_slot(slot, results);
 577
 578         curl_slist_free_all(headers);
 579         strbuf_release(&buf);
 580         return err;
 581 }
 582
 583 static curl_off_t xcurl_off_t(ssize_t len) {
 584         if (len > maximum_signed_value_of_type(curl_off_t))
 585                 die("cannot handle pushes this big");
 586         return (curl_off_t) len;
 587 }
 588
 589 static int post_rpc(struct rpc_state *rpc)
 590 {
 591         struct active_request_slot *slot;
 592         struct curl_slist *headers = http_copy_default_headers();
 593         int use_gzip = rpc->gzip_request;
 594         char *gzip_body = NULL;
 595         size_t gzip_size = 0;
 596         int err, large_request = 0;
 597         int needs_100_continue = 0;
 598
 599         /* Try to load the entire request, if we can fit it into the
 600          * allocated buffer space we can use HTTP/1.0 and avoid the
 601          * chunked encoding mess.
 602          */
 603         while (1) {
 604                 size_t left = rpc->alloc - rpc->len;
 605                 char *buf = rpc->buf + rpc->len;
 606                 int n;
 607
 608                 if (left < LARGE_PACKET_MAX) {
 609                         large_request = 1;
 610                         use_gzip = 0;
 611                         break;
 612                 }
 613
 614                 n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 615                 if (!n)
 616                         break;
 617                 rpc->len += n;
 618         }
 619
 620         if (large_request) {
 621                 struct slot_results results;
 622
 623                 do {
 624                         err = probe_rpc(rpc, &results);
 625                         if (err == HTTP_REAUTH)
 626                                 credential_fill(&http_auth);
 627                 } while (err == HTTP_REAUTH);
 628                 if (err != HTTP_OK)
 629                         return -1;
 630
 631                 if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 632                         needs_100_continue = 1;
 633         }
 634
 635         headers = curl_slist_append(headers, rpc->hdr_content_type);
 636         headers = curl_slist_append(headers, rpc->hdr_accept);
 637         headers = curl_slist_append(headers, needs_100_continue ?
 638                 "Expect: 100-continue" : "Expect:");
 639
 640         /* Add the extra Git-Protocol header */
 641         if (rpc->protocol_header)
 642                 headers = curl_slist_append(headers, rpc->protocol_header);
 643
 644 retry:
 645         slot = get_active_slot();
 646
 647         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 648         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 649         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 650         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 651
 652         if (large_request) {
 653                 /* The request body is large and the size cannot be predicted.
 654                  * We must use chunked encoding to send it.
 655                  */
 656                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 657                 rpc->initial_buffer = 1;
 658                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 659                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 660 #ifndef NO_CURL_IOCTL
 661                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 662                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 663 #endif
 664                 if (options.verbosity > 1) {
 665                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 666                         fflush(stderr);
 667                 }
 668
 669         } else if (gzip_body) {
 670                 /*
 671                  * If we are looping to retry authentication, then the previous
 672                  * run will have set up the headers and gzip buffer already,
 673                  * and we just need to send it.
 674                  */
 675                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 676                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 677
 678         } else if (use_gzip && 1024 < rpc->len) {
 679                 /* The client backend isn't giving us compressed data so
 680                  * we can try to deflate it ourselves, this may save on.
 681                  * the transfer time.
 682                  */
 683                 git_zstream stream;
 684                 int ret;
 685
 686                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 687                 gzip_size = git_deflate_bound(&stream, rpc->len);
 688                 gzip_body = xmalloc(gzip_size);
 689
 690                 stream.next_in = (unsigned char *)rpc->buf;
 691                 stream.avail_in = rpc->len;
 692                 stream.next_out = (unsigned char *)gzip_body;
 693                 stream.avail_out = gzip_size;
 694
 695                 ret = git_deflate(&stream, Z_FINISH);
 696                 if (ret != Z_STREAM_END)
 697                         die("cannot deflate request; zlib deflate error %d", ret);
 698
 699                 ret = git_deflate_end_gently(&stream);
 700                 if (ret != Z_OK)
 701                         die("cannot deflate request; zlib end error %d", ret);
 702
 703                 gzip_size = stream.total_out;
 704
 705                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 706                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 707                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 708
 709                 if (options.verbosity > 1) {
 710                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 711                                 rpc->service_name,
 712                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
 713                         fflush(stderr);
 714                 }
 715         } else {
 716                 /* We know the complete request size in advance, use the
 717                  * more normal Content-Length approach.
 718                  */
 719                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 720                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(rpc->len));
 721                 if (options.verbosity > 1) {
 722                         fprintf(stderr, "POST %s (%lu bytes)\n",
 723                                 rpc->service_name, (unsigned long)rpc->len);
 724                         fflush(stderr);
 725                 }
 726         }
 727
 728         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 729         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 730         curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 731
 732
 733         rpc->any_written = 0;
 734         err = run_slot(slot, NULL);
 735         if (err == HTTP_REAUTH && !large_request) {
 736                 credential_fill(&http_auth);
 737                 goto retry;
 738         }
 739         if (err != HTTP_OK)
 740                 err = -1;
 741
 742         if (!rpc->any_written)
 743                 err = -1;
 744
 745         curl_slist_free_all(headers);
 746         free(gzip_body);
 747         return err;
 748 }
 749
 750 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 751 {
 752         const char *svc = rpc->service_name;
 753         struct strbuf buf = STRBUF_INIT;
 754         struct strbuf *preamble = rpc->stdin_preamble;
 755         struct child_process client = CHILD_PROCESS_INIT;
 756         int err = 0;
 757
 758         client.in = -1;
 759         client.out = -1;
 760         client.git_cmd = 1;
 761         client.argv = rpc->argv;
 762         if (start_command(&client))
 763                 exit(1);
 764         if (preamble)
 765                 write_or_die(client.in, preamble->buf, preamble->len);
 766         if (heads)
 767                 write_or_die(client.in, heads->buf, heads->len);
 768
 769         rpc->alloc = http_post_buffer;
 770         rpc->buf = xmalloc(rpc->alloc);
 771         rpc->in = client.in;
 772         rpc->out = client.out;
 773         strbuf_init(&rpc->result, 0);
 774
 775         strbuf_addf(&buf, "%s%s", url.buf, svc);
 776         rpc->service_url = strbuf_detach(&buf, NULL);
 777
 778         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 779         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 780
 781         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 782         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 783
 784         if (get_protocol_http_header(heads->version, &buf))
 785                 rpc->protocol_header = strbuf_detach(&buf, NULL);
 786         else
 787                 rpc->protocol_header = NULL;
 788
 789         while (!err) {
 790                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 791                 if (!n)
 792                         break;
 793                 rpc->pos = 0;
 794                 rpc->len = n;
 795                 err |= post_rpc(rpc);
 796         }
 797
 798         close(client.in);
 799         client.in = -1;
 800         if (!err) {
 801                 strbuf_read(&rpc->result, client.out, 0);
 802         } else {
 803                 char buf[4096];
 804                 for (;;)
 805                         if (xread(client.out, buf, sizeof(buf)) <= 0)
 806                                 break;
 807         }
 808
 809         close(client.out);
 810         client.out = -1;
 811
 812         err |= finish_command(&client);
 813         free(rpc->service_url);
 814         free(rpc->hdr_content_type);
 815         free(rpc->hdr_accept);
 816         free(rpc->protocol_header);
 817         free(rpc->buf);
 818         strbuf_release(&buf);
 819         return err;
 820 }
 821
 822 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 823 {
 824         struct walker *walker;
 825         char **targets;
 826         int ret, i;
 827
 828         ALLOC_ARRAY(targets, nr_heads);
 829         if (options.depth || options.deepen_since)
 830                 die("dumb http transport does not support shallow capabilities");
 831         for (i = 0; i < nr_heads; i++)
 832                 targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
 833
 834         walker = get_http_walker(url.buf);
 835         walker->get_all = 1;
 836         walker->get_tree = 1;
 837         walker->get_history = 1;
 838         walker->get_verbosely = options.verbosity >= 3;
 839         walker->get_recover = 0;
 840         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 841         walker_free(walker);
 842
 843         for (i = 0; i < nr_heads; i++)
 844                 free(targets[i]);
 845         free(targets);
 846
 847         return ret ? error("fetch failed.") : 0;
 848 }
 849
 850 static int fetch_git(struct discovery *heads,
 851         int nr_heads, struct ref **to_fetch)
 852 {
 853         struct rpc_state rpc;
 854         struct strbuf preamble = STRBUF_INIT;
 855         int i, err;
 856         struct argv_array args = ARGV_ARRAY_INIT;
 857
 858         argv_array_pushl(&args, "fetch-pack", "--stateless-rpc",
 859                          "--stdin", "--lock-pack", NULL);
 860         if (options.followtags)
 861                 argv_array_push(&args, "--include-tag");
 862         if (options.thin)
 863                 argv_array_push(&args, "--thin");
 864         if (options.verbosity >= 3)
 865                 argv_array_pushl(&args, "-v", "-v", NULL);
 866         if (options.check_self_contained_and_connected)
 867                 argv_array_push(&args, "--check-self-contained-and-connected");
 868         if (options.cloning)
 869                 argv_array_push(&args, "--cloning");
 870         if (options.update_shallow)
 871                 argv_array_push(&args, "--update-shallow");
 872         if (!options.progress)
 873                 argv_array_push(&args, "--no-progress");
 874         if (options.depth)
 875                 argv_array_pushf(&args, "--depth=%lu", options.depth);
 876         if (options.deepen_since)
 877                 argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since);
 878         for (i = 0; i < options.deepen_not.nr; i++)
 879                 argv_array_pushf(&args, "--shallow-exclude=%s",
 880                                  options.deepen_not.items[i].string);
 881         if (options.deepen_relative && options.depth)
 882                 argv_array_push(&args, "--deepen-relative");
 883         argv_array_push(&args, url.buf);
 884
 885         for (i = 0; i < nr_heads; i++) {
 886                 struct ref *ref = to_fetch[i];
 887                 if (!*ref->name)
 888                         die("cannot fetch by sha1 over smart http");
 889                 packet_buf_write(&preamble, "%s %s\n",
 890                                  oid_to_hex(&ref->old_oid), ref->name);
 891         }
 892         packet_buf_flush(&preamble);
 893
 894         memset(&rpc, 0, sizeof(rpc));
 895         rpc.service_name = "git-upload-pack",
 896         rpc.argv = args.argv;
 897         rpc.stdin_preamble = &preamble;
 898         rpc.gzip_request = 1;
 899
 900         err = rpc_service(&rpc, heads);
 901         if (rpc.result.len)
 902                 write_or_die(1, rpc.result.buf, rpc.result.len);
 903         strbuf_release(&rpc.result);
 904         strbuf_release(&preamble);
 905         argv_array_clear(&args);
 906         return err;
 907 }
 908
 909 static int fetch(int nr_heads, struct ref **to_fetch)
 910 {
 911         struct discovery *d = discover_refs("git-upload-pack", 0);
 912         if (d->proto_git)
 913                 return fetch_git(d, nr_heads, to_fetch);
 914         else
 915                 return fetch_dumb(nr_heads, to_fetch);
 916 }
 917
 918 static void parse_fetch(struct strbuf *buf)
 919 {
 920         struct ref **to_fetch = NULL;
 921         struct ref *list_head = NULL;
 922         struct ref **list = &list_head;
 923         int alloc_heads = 0, nr_heads = 0;
 924
 925         do {
 926                 const char *p;
 927                 if (skip_prefix(buf->buf, "fetch ", &p)) {
 928                         const char *name;
 929                         struct ref *ref;
 930                         struct object_id old_oid;
 931
 932                         if (get_oid_hex(p, &old_oid))
 933                                 die("protocol error: expected sha/ref, got %s'", p);
 934                         if (p[GIT_SHA1_HEXSZ] == ' ')
 935                                 name = p + GIT_SHA1_HEXSZ + 1;
 936                         else if (!p[GIT_SHA1_HEXSZ])
 937                                 name = "";
 938                         else
 939                                 die("protocol error: expected sha/ref, got %s'", p);
 940
 941                         ref = alloc_ref(name);
 942                         oidcpy(&ref->old_oid, &old_oid);
 943
 944                         *list = ref;
 945                         list = &ref->next;
 946
 947                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 948                         to_fetch[nr_heads++] = ref;
 949                 }
 950                 else
 951                         die("http transport does not support %s", buf->buf);
 952
 953                 strbuf_reset(buf);
 954                 if (strbuf_getline_lf(buf, stdin) == EOF)
 955                         return;
 956                 if (!*buf->buf)
 957                         break;
 958         } while (1);
 959
 960         if (fetch(nr_heads, to_fetch))
 961                 exit(128); /* error already reported */
 962         free_refs(list_head);
 963         free(to_fetch);
 964
 965         printf("\n");
 966         fflush(stdout);
 967         strbuf_reset(buf);
 968 }
 969
 970 static int push_dav(int nr_spec, char **specs)
 971 {
 972         struct child_process child = CHILD_PROCESS_INIT;
 973         size_t i;
 974
 975         child.git_cmd = 1;
 976         argv_array_push(&child.args, "http-push");
 977         argv_array_push(&child.args, "--helper-status");
 978         if (options.dry_run)
 979                 argv_array_push(&child.args, "--dry-run");
 980         if (options.verbosity > 1)
 981                 argv_array_push(&child.args, "--verbose");
 982         argv_array_push(&child.args, url.buf);
 983         for (i = 0; i < nr_spec; i++)
 984                 argv_array_push(&child.args, specs[i]);
 985
 986         if (run_command(&child))
 987                 die("git-http-push failed");
 988         return 0;
 989 }
 990
 991 static int push_git(struct discovery *heads, int nr_spec, char **specs)
 992 {
 993         struct rpc_state rpc;
 994         int i, err;
 995         struct argv_array args;
 996         struct string_list_item *cas_option;
 997         struct strbuf preamble = STRBUF_INIT;
 998
 999         argv_array_init(&args);
1000         argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
1001                          NULL);
1002
1003         if (options.thin)
1004                 argv_array_push(&args, "--thin");
1005         if (options.dry_run)
1006                 argv_array_push(&args, "--dry-run");
1007         if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
1008                 argv_array_push(&args, "--signed=yes");
1009         else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
1010                 argv_array_push(&args, "--signed=if-asked");
1011         if (options.verbosity == 0)
1012                 argv_array_push(&args, "--quiet");
1013         else if (options.verbosity > 1)
1014                 argv_array_push(&args, "--verbose");
1015         for (i = 0; i < options.push_options.nr; i++)
1016                 argv_array_pushf(&args, "--push-option=%s",
1017                                  options.push_options.items[i].string);
1018         argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
1019         for_each_string_list_item(cas_option, &cas_options)
1020                 argv_array_push(&args, cas_option->string);
1021         argv_array_push(&args, url.buf);
1022
1023         argv_array_push(&args, "--stdin");
1024         for (i = 0; i < nr_spec; i++)
1025                 packet_buf_write(&preamble, "%s\n", specs[i]);
1026         packet_buf_flush(&preamble);
1027
1028         memset(&rpc, 0, sizeof(rpc));
1029         rpc.service_name = "git-receive-pack",
1030         rpc.argv = args.argv;
1031         rpc.stdin_preamble = &preamble;
1032
1033         err = rpc_service(&rpc, heads);
1034         if (rpc.result.len)
1035                 write_or_die(1, rpc.result.buf, rpc.result.len);
1036         strbuf_release(&rpc.result);
1037         strbuf_release(&preamble);
1038         argv_array_clear(&args);
1039         return err;
1040 }
1041
1042 static int push(int nr_spec, char **specs)
1043 {
1044         struct discovery *heads = discover_refs("git-receive-pack", 1);
1045         int ret;
1046
1047         if (heads->proto_git)
1048                 ret = push_git(heads, nr_spec, specs);
1049         else
1050                 ret = push_dav(nr_spec, specs);
1051         free_discovery(heads);
1052         return ret;
1053 }
1054
1055 static void parse_push(struct strbuf *buf)
1056 {
1057         char **specs = NULL;
1058         int alloc_spec = 0, nr_spec = 0, i, ret;
1059
1060         do {
1061                 if (starts_with(buf->buf, "push ")) {
1062                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
1063                         specs[nr_spec++] = xstrdup(buf->buf + 5);
1064                 }
1065                 else
1066                         die("http transport does not support %s", buf->buf);
1067
1068                 strbuf_reset(buf);
1069                 if (strbuf_getline_lf(buf, stdin) == EOF)
1070                         goto free_specs;
1071                 if (!*buf->buf)
1072                         break;
1073         } while (1);
1074
1075         ret = push(nr_spec, specs);
1076         printf("\n");
1077         fflush(stdout);
1078
1079         if (ret)
1080                 exit(128); /* error already reported */
1081
1082  free_specs:
1083         for (i = 0; i < nr_spec; i++)
1084                 free(specs[i]);
1085         free(specs);
1086 }
1087
1088 int cmd_main(int argc, const char **argv)
1089 {
1090         struct strbuf buf = STRBUF_INIT;
1091         int nongit;
1092
1093         setup_git_directory_gently(&nongit);
1094         if (argc < 2) {
1095                 error("remote-curl: usage: git remote-curl <remote> [<url>]");
1096                 return 1;
1097         }
1098
1099         options.verbosity = 1;
1100         options.progress = !!isatty(2);
1101         options.thin = 1;
1102         string_list_init(&options.deepen_not, 1);
1103         string_list_init(&options.push_options, 1);
1104
1105         remote = remote_get(argv[1]);
1106
1107         if (argc > 2) {
1108                 end_url_with_slash(&url, argv[2]);
1109         } else {
1110                 end_url_with_slash(&url, remote->url[0]);
1111         }
1112
1113         http_init(remote, url.buf, 0);
1114
1115         do {
1116                 const char *arg;
1117
1118                 if (strbuf_getline_lf(&buf, stdin) == EOF) {
1119                         if (ferror(stdin))
1120                                 error("remote-curl: error reading command stream from git");
1121                         return 1;
1122                 }
1123                 if (buf.len == 0)
1124                         break;
1125                 if (starts_with(buf.buf, "fetch ")) {
1126                         if (nongit)
1127                                 die("remote-curl: fetch attempted without a local repo");
1128                         parse_fetch(&buf);
1129
1130                 } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1131                         int for_push = !!strstr(buf.buf + 4, "for-push");
1132                         output_refs(get_refs(for_push));
1133
1134                 } else if (starts_with(buf.buf, "push ")) {
1135                         parse_push(&buf);
1136
1137                 } else if (skip_prefix(buf.buf, "option ", &arg)) {
1138                         char *value = strchr(arg, ' ');
1139                         int result;
1140
1141                         if (value)
1142                                 *value++ = '\0';
1143                         else
1144                                 value = "true";
1145
1146                         result = set_option(arg, value);
1147                         if (!result)
1148                                 printf("ok\n");
1149                         else if (result < 0)
1150                                 printf("error invalid value\n");
1151                         else
1152                                 printf("unsupported\n");
1153                         fflush(stdout);
1154
1155                 } else if (!strcmp(buf.buf, "capabilities")) {
1156                         printf("fetch\n");
1157                         printf("option\n");
1158                         printf("push\n");
1159                         printf("check-connectivity\n");
1160                         printf("\n");
1161                         fflush(stdout);
1162                 } else {
1163                         error("remote-curl: unknown command '%s' from git", buf.buf);
1164                         return 1;
1165                 }
1166                 strbuf_reset(&buf);
1167         } while (1);
1168
1169         http_cleanup();
1170
1171         return 0;
1172 }