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         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_v2:
 189                 die("support for protocol v2 not implemented yet");
 190                 break;
 191         case protocol_v1:
 192         case protocol_v0:
 193                 get_remote_heads(&reader, &list, for_push ? REF_NORMAL : 0,
 194                                  NULL, &heads->shallow);
 195                 break;
 196         case protocol_unknown_version:
 197                 BUG("unknown protocol version");
 198         }
 199
 200         return list;
 201 }
 202
 203 static struct ref *parse_info_refs(struct discovery *heads)
 204 {
 205         char *data, *start, *mid;
 206         char *ref_name;
 207         int i = 0;
 208
 209         struct ref *refs = NULL;
 210         struct ref *ref = NULL;
 211         struct ref *last_ref = NULL;
 212
 213         data = heads->buf;
 214         start = NULL;
 215         mid = data;
 216         while (i < heads->len) {
 217                 if (!start) {
 218                         start = &data[i];
 219                 }
 220                 if (data[i] == '\t')
 221                         mid = &data[i];
 222                 if (data[i] == '\n') {
 223                         if (mid - start != 40)
 224                                 die("%sinfo/refs not valid: is this a git repository?",
 225                                     url.buf);
 226                         data[i] = 0;
 227                         ref_name = mid + 1;
 228                         ref = alloc_ref(ref_name);
 229                         get_oid_hex(start, &ref->old_oid);
 230                         if (!refs)
 231                                 refs = ref;
 232                         if (last_ref)
 233                                 last_ref->next = ref;
 234                         last_ref = ref;
 235                         start = NULL;
 236                 }
 237                 i++;
 238         }
 239
 240         ref = alloc_ref("HEAD");
 241         if (!http_fetch_ref(url.buf, ref) &&
 242             !resolve_remote_symref(ref, refs)) {
 243                 ref->next = refs;
 244                 refs = ref;
 245         } else {
 246                 free(ref);
 247         }
 248
 249         return refs;
 250 }
 251
 252 static void free_discovery(struct discovery *d)
 253 {
 254         if (d) {
 255                 if (d == last_discovery)
 256                         last_discovery = NULL;
 257                 free(d->shallow.oid);
 258                 free(d->buf_alloc);
 259                 free_refs(d->refs);
 260                 free(d->service);
 261                 free(d);
 262         }
 263 }
 264
 265 static int show_http_message(struct strbuf *type, struct strbuf *charset,
 266                              struct strbuf *msg)
 267 {
 268         const char *p, *eol;
 269
 270         /*
 271          * We only show text/plain parts, as other types are likely
 272          * to be ugly to look at on the user's terminal.
 273          */
 274         if (strcmp(type->buf, "text/plain"))
 275                 return -1;
 276         if (charset->len)
 277                 strbuf_reencode(msg, charset->buf, get_log_output_encoding());
 278
 279         strbuf_trim(msg);
 280         if (!msg->len)
 281                 return -1;
 282
 283         p = msg->buf;
 284         do {
 285                 eol = strchrnul(p, '\n');
 286                 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 287                 p = eol + 1;
 288         } while(*eol);
 289         return 0;
 290 }
 291
 292 static struct discovery *discover_refs(const char *service, int for_push)
 293 {
 294         struct strbuf exp = STRBUF_INIT;
 295         struct strbuf type = STRBUF_INIT;
 296         struct strbuf charset = STRBUF_INIT;
 297         struct strbuf buffer = STRBUF_INIT;
 298         struct strbuf refs_url = STRBUF_INIT;
 299         struct strbuf effective_url = STRBUF_INIT;
 300         struct discovery *last = last_discovery;
 301         int http_ret, maybe_smart = 0;
 302         struct http_get_options http_options;
 303
 304         if (last && !strcmp(service, last->service))
 305                 return last;
 306         free_discovery(last);
 307
 308         strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 309         if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 310              git_env_bool("GIT_SMART_HTTP", 1)) {
 311                 maybe_smart = 1;
 312                 if (!strchr(url.buf, '?'))
 313                         strbuf_addch(&refs_url, '?');
 314                 else
 315                         strbuf_addch(&refs_url, '&');
 316                 strbuf_addf(&refs_url, "service=%s", service);
 317         }
 318
 319         memset(&http_options, 0, sizeof(http_options));
 320         http_options.content_type = &type;
 321         http_options.charset = &charset;
 322         http_options.effective_url = &effective_url;
 323         http_options.base_url = &url;
 324         http_options.initial_request = 1;
 325         http_options.no_cache = 1;
 326         http_options.keep_error = 1;
 327
 328         http_ret = http_get_strbuf(refs_url.buf, &buffer, &http_options);
 329         switch (http_ret) {
 330         case HTTP_OK:
 331                 break;
 332         case HTTP_MISSING_TARGET:
 333                 show_http_message(&type, &charset, &buffer);
 334                 die("repository '%s' not found", url.buf);
 335         case HTTP_NOAUTH:
 336                 show_http_message(&type, &charset, &buffer);
 337                 die("Authentication failed for '%s'", url.buf);
 338         default:
 339                 show_http_message(&type, &charset, &buffer);
 340                 die("unable to access '%s': %s", url.buf, curl_errorstr);
 341         }
 342
 343         if (options.verbosity && !starts_with(refs_url.buf, url.buf))
 344                 warning(_("redirecting to %s"), url.buf);
 345
 346         last= xcalloc(1, sizeof(*last_discovery));
 347         last->service = xstrdup(service);
 348         last->buf_alloc = strbuf_detach(&buffer, &last->len);
 349         last->buf = last->buf_alloc;
 350
 351         strbuf_addf(&exp, "application/x-%s-advertisement", service);
 352         if (maybe_smart &&
 353             (5 <= last->len && last->buf[4] == '#') &&
 354             !strbuf_cmp(&exp, &type)) {
 355                 char *line;
 356
 357                 /*
 358                  * smart HTTP response; validate that the service
 359                  * pkt-line matches our request.
 360                  */
 361                 line = packet_read_line_buf(&last->buf, &last->len, NULL);
 362
 363                 strbuf_reset(&exp);
 364                 strbuf_addf(&exp, "# service=%s", service);
 365                 if (strcmp(line, exp.buf))
 366                         die("invalid server response; got '%s'", line);
 367                 strbuf_release(&exp);
 368
 369                 /* The header can include additional metadata lines, up
 370                  * until a packet flush marker.  Ignore these now, but
 371                  * in the future we might start to scan them.
 372                  */
 373                 while (packet_read_line_buf(&last->buf, &last->len, NULL))
 374                         ;
 375
 376                 last->proto_git = 1;
 377         }
 378
 379         if (last->proto_git)
 380                 last->refs = parse_git_refs(last, for_push);
 381         else
 382                 last->refs = parse_info_refs(last);
 383
 384         strbuf_release(&refs_url);
 385         strbuf_release(&exp);
 386         strbuf_release(&type);
 387         strbuf_release(&charset);
 388         strbuf_release(&effective_url);
 389         strbuf_release(&buffer);
 390         last_discovery = last;
 391         return last;
 392 }
 393
 394 static struct ref *get_refs(int for_push)
 395 {
 396         struct discovery *heads;
 397
 398         if (for_push)
 399                 heads = discover_refs("git-receive-pack", for_push);
 400         else
 401                 heads = discover_refs("git-upload-pack", for_push);
 402
 403         return heads->refs;
 404 }
 405
 406 static void output_refs(struct ref *refs)
 407 {
 408         struct ref *posn;
 409         for (posn = refs; posn; posn = posn->next) {
 410                 if (posn->symref)
 411                         printf("@%s %s\n", posn->symref, posn->name);
 412                 else
 413                         printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name);
 414         }
 415         printf("\n");
 416         fflush(stdout);
 417 }
 418
 419 struct rpc_state {
 420         const char *service_name;
 421         const char **argv;
 422         struct strbuf *stdin_preamble;
 423         char *service_url;
 424         char *hdr_content_type;
 425         char *hdr_accept;
 426         char *buf;
 427         size_t alloc;
 428         size_t len;
 429         size_t pos;
 430         int in;
 431         int out;
 432         int any_written;
 433         struct strbuf result;
 434         unsigned gzip_request : 1;
 435         unsigned initial_buffer : 1;
 436 };
 437
 438 static size_t rpc_out(void *ptr, size_t eltsize,
 439                 size_t nmemb, void *buffer_)
 440 {
 441         size_t max = eltsize * nmemb;
 442         struct rpc_state *rpc = buffer_;
 443         size_t avail = rpc->len - rpc->pos;
 444
 445         if (!avail) {
 446                 rpc->initial_buffer = 0;
 447                 avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 448                 if (!avail)
 449                         return 0;
 450                 rpc->pos = 0;
 451                 rpc->len = avail;
 452         }
 453
 454         if (max < avail)
 455                 avail = max;
 456         memcpy(ptr, rpc->buf + rpc->pos, avail);
 457         rpc->pos += avail;
 458         return avail;
 459 }
 460
 461 #ifndef NO_CURL_IOCTL
 462 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 463 {
 464         struct rpc_state *rpc = clientp;
 465
 466         switch (cmd) {
 467         case CURLIOCMD_NOP:
 468                 return CURLIOE_OK;
 469
 470         case CURLIOCMD_RESTARTREAD:
 471                 if (rpc->initial_buffer) {
 472                         rpc->pos = 0;
 473                         return CURLIOE_OK;
 474                 }
 475                 error("unable to rewind rpc post data - try increasing http.postBuffer");
 476                 return CURLIOE_FAILRESTART;
 477
 478         default:
 479                 return CURLIOE_UNKNOWNCMD;
 480         }
 481 }
 482 #endif
 483
 484 static size_t rpc_in(char *ptr, size_t eltsize,
 485                 size_t nmemb, void *buffer_)
 486 {
 487         size_t size = eltsize * nmemb;
 488         struct rpc_state *rpc = buffer_;
 489         if (size)
 490                 rpc->any_written = 1;
 491         write_or_die(rpc->in, ptr, size);
 492         return size;
 493 }
 494
 495 static int run_slot(struct active_request_slot *slot,
 496                     struct slot_results *results)
 497 {
 498         int err;
 499         struct slot_results results_buf;
 500
 501         if (!results)
 502                 results = &results_buf;
 503
 504         err = run_one_slot(slot, results);
 505
 506         if (err != HTTP_OK && err != HTTP_REAUTH) {
 507                 struct strbuf msg = STRBUF_INIT;
 508                 if (results->http_code && results->http_code != 200)
 509                         strbuf_addf(&msg, "HTTP %ld", results->http_code);
 510                 if (results->curl_result != CURLE_OK) {
 511                         if (msg.len)
 512                                 strbuf_addch(&msg, ' ');
 513                         strbuf_addf(&msg, "curl %d", results->curl_result);
 514                         if (curl_errorstr[0]) {
 515                                 strbuf_addch(&msg, ' ');
 516                                 strbuf_addstr(&msg, curl_errorstr);
 517                         }
 518                 }
 519                 error("RPC failed; %s", msg.buf);
 520                 strbuf_release(&msg);
 521         }
 522
 523         return err;
 524 }
 525
 526 static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 527 {
 528         struct active_request_slot *slot;
 529         struct curl_slist *headers = http_copy_default_headers();
 530         struct strbuf buf = STRBUF_INIT;
 531         int err;
 532
 533         slot = get_active_slot();
 534
 535         headers = curl_slist_append(headers, rpc->hdr_content_type);
 536         headers = curl_slist_append(headers, rpc->hdr_accept);
 537
 538         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 539         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 540         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 541         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 542         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 543         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 544         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 545         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 546         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 547
 548         err = run_slot(slot, results);
 549
 550         curl_slist_free_all(headers);
 551         strbuf_release(&buf);
 552         return err;
 553 }
 554
 555 static curl_off_t xcurl_off_t(ssize_t len) {
 556         if (len > maximum_signed_value_of_type(curl_off_t))
 557                 die("cannot handle pushes this big");
 558         return (curl_off_t) len;
 559 }
 560
 561 static int post_rpc(struct rpc_state *rpc)
 562 {
 563         struct active_request_slot *slot;
 564         struct curl_slist *headers = http_copy_default_headers();
 565         int use_gzip = rpc->gzip_request;
 566         char *gzip_body = NULL;
 567         size_t gzip_size = 0;
 568         int err, large_request = 0;
 569         int needs_100_continue = 0;
 570
 571         /* Try to load the entire request, if we can fit it into the
 572          * allocated buffer space we can use HTTP/1.0 and avoid the
 573          * chunked encoding mess.
 574          */
 575         while (1) {
 576                 size_t left = rpc->alloc - rpc->len;
 577                 char *buf = rpc->buf + rpc->len;
 578                 int n;
 579
 580                 if (left < LARGE_PACKET_MAX) {
 581                         large_request = 1;
 582                         use_gzip = 0;
 583                         break;
 584                 }
 585
 586                 n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 587                 if (!n)
 588                         break;
 589                 rpc->len += n;
 590         }
 591
 592         if (large_request) {
 593                 struct slot_results results;
 594
 595                 do {
 596                         err = probe_rpc(rpc, &results);
 597                         if (err == HTTP_REAUTH)
 598                                 credential_fill(&http_auth);
 599                 } while (err == HTTP_REAUTH);
 600                 if (err != HTTP_OK)
 601                         return -1;
 602
 603                 if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 604                         needs_100_continue = 1;
 605         }
 606
 607         headers = curl_slist_append(headers, rpc->hdr_content_type);
 608         headers = curl_slist_append(headers, rpc->hdr_accept);
 609         headers = curl_slist_append(headers, needs_100_continue ?
 610                 "Expect: 100-continue" : "Expect:");
 611
 612 retry:
 613         slot = get_active_slot();
 614
 615         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 616         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 617         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 618         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 619
 620         if (large_request) {
 621                 /* The request body is large and the size cannot be predicted.
 622                  * We must use chunked encoding to send it.
 623                  */
 624                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 625                 rpc->initial_buffer = 1;
 626                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 627                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 628 #ifndef NO_CURL_IOCTL
 629                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 630                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 631 #endif
 632                 if (options.verbosity > 1) {
 633                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 634                         fflush(stderr);
 635                 }
 636
 637         } else if (gzip_body) {
 638                 /*
 639                  * If we are looping to retry authentication, then the previous
 640                  * run will have set up the headers and gzip buffer already,
 641                  * and we just need to send it.
 642                  */
 643                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 644                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 645
 646         } else if (use_gzip && 1024 < rpc->len) {
 647                 /* The client backend isn't giving us compressed data so
 648                  * we can try to deflate it ourselves, this may save on.
 649                  * the transfer time.
 650                  */
 651                 git_zstream stream;
 652                 int ret;
 653
 654                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 655                 gzip_size = git_deflate_bound(&stream, rpc->len);
 656                 gzip_body = xmalloc(gzip_size);
 657
 658                 stream.next_in = (unsigned char *)rpc->buf;
 659                 stream.avail_in = rpc->len;
 660                 stream.next_out = (unsigned char *)gzip_body;
 661                 stream.avail_out = gzip_size;
 662
 663                 ret = git_deflate(&stream, Z_FINISH);
 664                 if (ret != Z_STREAM_END)
 665                         die("cannot deflate request; zlib deflate error %d", ret);
 666
 667                 ret = git_deflate_end_gently(&stream);
 668                 if (ret != Z_OK)
 669                         die("cannot deflate request; zlib end error %d", ret);
 670
 671                 gzip_size = stream.total_out;
 672
 673                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 674                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 675                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 676
 677                 if (options.verbosity > 1) {
 678                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 679                                 rpc->service_name,
 680                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
 681                         fflush(stderr);
 682                 }
 683         } else {
 684                 /* We know the complete request size in advance, use the
 685                  * more normal Content-Length approach.
 686                  */
 687                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 688                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(rpc->len));
 689                 if (options.verbosity > 1) {
 690                         fprintf(stderr, "POST %s (%lu bytes)\n",
 691                                 rpc->service_name, (unsigned long)rpc->len);
 692                         fflush(stderr);
 693                 }
 694         }
 695
 696         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 697         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 698         curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 699
 700
 701         rpc->any_written = 0;
 702         err = run_slot(slot, NULL);
 703         if (err == HTTP_REAUTH && !large_request) {
 704                 credential_fill(&http_auth);
 705                 goto retry;
 706         }
 707         if (err != HTTP_OK)
 708                 err = -1;
 709
 710         if (!rpc->any_written)
 711                 err = -1;
 712
 713         curl_slist_free_all(headers);
 714         free(gzip_body);
 715         return err;
 716 }
 717
 718 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 719 {
 720         const char *svc = rpc->service_name;
 721         struct strbuf buf = STRBUF_INIT;
 722         struct strbuf *preamble = rpc->stdin_preamble;
 723         struct child_process client = CHILD_PROCESS_INIT;
 724         int err = 0;
 725
 726         client.in = -1;
 727         client.out = -1;
 728         client.git_cmd = 1;
 729         client.argv = rpc->argv;
 730         if (start_command(&client))
 731                 exit(1);
 732         if (preamble)
 733                 write_or_die(client.in, preamble->buf, preamble->len);
 734         if (heads)
 735                 write_or_die(client.in, heads->buf, heads->len);
 736
 737         rpc->alloc = http_post_buffer;
 738         rpc->buf = xmalloc(rpc->alloc);
 739         rpc->in = client.in;
 740         rpc->out = client.out;
 741         strbuf_init(&rpc->result, 0);
 742
 743         strbuf_addf(&buf, "%s%s", url.buf, svc);
 744         rpc->service_url = strbuf_detach(&buf, NULL);
 745
 746         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 747         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 748
 749         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 750         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 751
 752         while (!err) {
 753                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 754                 if (!n)
 755                         break;
 756                 rpc->pos = 0;
 757                 rpc->len = n;
 758                 err |= post_rpc(rpc);
 759         }
 760
 761         close(client.in);
 762         client.in = -1;
 763         if (!err) {
 764                 strbuf_read(&rpc->result, client.out, 0);
 765         } else {
 766                 char buf[4096];
 767                 for (;;)
 768                         if (xread(client.out, buf, sizeof(buf)) <= 0)
 769                                 break;
 770         }
 771
 772         close(client.out);
 773         client.out = -1;
 774
 775         err |= finish_command(&client);
 776         free(rpc->service_url);
 777         free(rpc->hdr_content_type);
 778         free(rpc->hdr_accept);
 779         free(rpc->buf);
 780         strbuf_release(&buf);
 781         return err;
 782 }
 783
 784 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 785 {
 786         struct walker *walker;
 787         char **targets;
 788         int ret, i;
 789
 790         ALLOC_ARRAY(targets, nr_heads);
 791         if (options.depth || options.deepen_since)
 792                 die("dumb http transport does not support shallow capabilities");
 793         for (i = 0; i < nr_heads; i++)
 794                 targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
 795
 796         walker = get_http_walker(url.buf);
 797         walker->get_all = 1;
 798         walker->get_tree = 1;
 799         walker->get_history = 1;
 800         walker->get_verbosely = options.verbosity >= 3;
 801         walker->get_recover = 0;
 802         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 803         walker_free(walker);
 804
 805         for (i = 0; i < nr_heads; i++)
 806                 free(targets[i]);
 807         free(targets);
 808
 809         return ret ? error("fetch failed.") : 0;
 810 }
 811
 812 static int fetch_git(struct discovery *heads,
 813         int nr_heads, struct ref **to_fetch)
 814 {
 815         struct rpc_state rpc;
 816         struct strbuf preamble = STRBUF_INIT;
 817         int i, err;
 818         struct argv_array args = ARGV_ARRAY_INIT;
 819
 820         argv_array_pushl(&args, "fetch-pack", "--stateless-rpc",
 821                          "--stdin", "--lock-pack", NULL);
 822         if (options.followtags)
 823                 argv_array_push(&args, "--include-tag");
 824         if (options.thin)
 825                 argv_array_push(&args, "--thin");
 826         if (options.verbosity >= 3)
 827                 argv_array_pushl(&args, "-v", "-v", NULL);
 828         if (options.check_self_contained_and_connected)
 829                 argv_array_push(&args, "--check-self-contained-and-connected");
 830         if (options.cloning)
 831                 argv_array_push(&args, "--cloning");
 832         if (options.update_shallow)
 833                 argv_array_push(&args, "--update-shallow");
 834         if (!options.progress)
 835                 argv_array_push(&args, "--no-progress");
 836         if (options.depth)
 837                 argv_array_pushf(&args, "--depth=%lu", options.depth);
 838         if (options.deepen_since)
 839                 argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since);
 840         for (i = 0; i < options.deepen_not.nr; i++)
 841                 argv_array_pushf(&args, "--shallow-exclude=%s",
 842                                  options.deepen_not.items[i].string);
 843         if (options.deepen_relative && options.depth)
 844                 argv_array_push(&args, "--deepen-relative");
 845         argv_array_push(&args, url.buf);
 846
 847         for (i = 0; i < nr_heads; i++) {
 848                 struct ref *ref = to_fetch[i];
 849                 if (!*ref->name)
 850                         die("cannot fetch by sha1 over smart http");
 851                 packet_buf_write(&preamble, "%s %s\n",
 852                                  oid_to_hex(&ref->old_oid), ref->name);
 853         }
 854         packet_buf_flush(&preamble);
 855
 856         memset(&rpc, 0, sizeof(rpc));
 857         rpc.service_name = "git-upload-pack",
 858         rpc.argv = args.argv;
 859         rpc.stdin_preamble = &preamble;
 860         rpc.gzip_request = 1;
 861
 862         err = rpc_service(&rpc, heads);
 863         if (rpc.result.len)
 864                 write_or_die(1, rpc.result.buf, rpc.result.len);
 865         strbuf_release(&rpc.result);
 866         strbuf_release(&preamble);
 867         argv_array_clear(&args);
 868         return err;
 869 }
 870
 871 static int fetch(int nr_heads, struct ref **to_fetch)
 872 {
 873         struct discovery *d = discover_refs("git-upload-pack", 0);
 874         if (d->proto_git)
 875                 return fetch_git(d, nr_heads, to_fetch);
 876         else
 877                 return fetch_dumb(nr_heads, to_fetch);
 878 }
 879
 880 static void parse_fetch(struct strbuf *buf)
 881 {
 882         struct ref **to_fetch = NULL;
 883         struct ref *list_head = NULL;
 884         struct ref **list = &list_head;
 885         int alloc_heads = 0, nr_heads = 0;
 886
 887         do {
 888                 const char *p;
 889                 if (skip_prefix(buf->buf, "fetch ", &p)) {
 890                         const char *name;
 891                         struct ref *ref;
 892                         struct object_id old_oid;
 893
 894                         if (get_oid_hex(p, &old_oid))
 895                                 die("protocol error: expected sha/ref, got %s'", p);
 896                         if (p[GIT_SHA1_HEXSZ] == ' ')
 897                                 name = p + GIT_SHA1_HEXSZ + 1;
 898                         else if (!p[GIT_SHA1_HEXSZ])
 899                                 name = "";
 900                         else
 901                                 die("protocol error: expected sha/ref, got %s'", p);
 902
 903                         ref = alloc_ref(name);
 904                         oidcpy(&ref->old_oid, &old_oid);
 905
 906                         *list = ref;
 907                         list = &ref->next;
 908
 909                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 910                         to_fetch[nr_heads++] = ref;
 911                 }
 912                 else
 913                         die("http transport does not support %s", buf->buf);
 914
 915                 strbuf_reset(buf);
 916                 if (strbuf_getline_lf(buf, stdin) == EOF)
 917                         return;
 918                 if (!*buf->buf)
 919                         break;
 920         } while (1);
 921
 922         if (fetch(nr_heads, to_fetch))
 923                 exit(128); /* error already reported */
 924         free_refs(list_head);
 925         free(to_fetch);
 926
 927         printf("\n");
 928         fflush(stdout);
 929         strbuf_reset(buf);
 930 }
 931
 932 static int push_dav(int nr_spec, char **specs)
 933 {
 934         struct child_process child = CHILD_PROCESS_INIT;
 935         size_t i;
 936
 937         child.git_cmd = 1;
 938         argv_array_push(&child.args, "http-push");
 939         argv_array_push(&child.args, "--helper-status");
 940         if (options.dry_run)
 941                 argv_array_push(&child.args, "--dry-run");
 942         if (options.verbosity > 1)
 943                 argv_array_push(&child.args, "--verbose");
 944         argv_array_push(&child.args, url.buf);
 945         for (i = 0; i < nr_spec; i++)
 946                 argv_array_push(&child.args, specs[i]);
 947
 948         if (run_command(&child))
 949                 die("git-http-push failed");
 950         return 0;
 951 }
 952
 953 static int push_git(struct discovery *heads, int nr_spec, char **specs)
 954 {
 955         struct rpc_state rpc;
 956         int i, err;
 957         struct argv_array args;
 958         struct string_list_item *cas_option;
 959         struct strbuf preamble = STRBUF_INIT;
 960
 961         argv_array_init(&args);
 962         argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 963                          NULL);
 964
 965         if (options.thin)
 966                 argv_array_push(&args, "--thin");
 967         if (options.dry_run)
 968                 argv_array_push(&args, "--dry-run");
 969         if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
 970                 argv_array_push(&args, "--signed=yes");
 971         else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
 972                 argv_array_push(&args, "--signed=if-asked");
 973         if (options.verbosity == 0)
 974                 argv_array_push(&args, "--quiet");
 975         else if (options.verbosity > 1)
 976                 argv_array_push(&args, "--verbose");
 977         for (i = 0; i < options.push_options.nr; i++)
 978                 argv_array_pushf(&args, "--push-option=%s",
 979                                  options.push_options.items[i].string);
 980         argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 981         for_each_string_list_item(cas_option, &cas_options)
 982                 argv_array_push(&args, cas_option->string);
 983         argv_array_push(&args, url.buf);
 984
 985         argv_array_push(&args, "--stdin");
 986         for (i = 0; i < nr_spec; i++)
 987                 packet_buf_write(&preamble, "%s\n", specs[i]);
 988         packet_buf_flush(&preamble);
 989
 990         memset(&rpc, 0, sizeof(rpc));
 991         rpc.service_name = "git-receive-pack",
 992         rpc.argv = args.argv;
 993         rpc.stdin_preamble = &preamble;
 994
 995         err = rpc_service(&rpc, heads);
 996         if (rpc.result.len)
 997                 write_or_die(1, rpc.result.buf, rpc.result.len);
 998         strbuf_release(&rpc.result);
 999         strbuf_release(&preamble);
1000         argv_array_clear(&args);
1001         return err;
1002 }
1003
1004 static int push(int nr_spec, char **specs)
1005 {
1006         struct discovery *heads = discover_refs("git-receive-pack", 1);
1007         int ret;
1008
1009         if (heads->proto_git)
1010                 ret = push_git(heads, nr_spec, specs);
1011         else
1012                 ret = push_dav(nr_spec, specs);
1013         free_discovery(heads);
1014         return ret;
1015 }
1016
1017 static void parse_push(struct strbuf *buf)
1018 {
1019         char **specs = NULL;
1020         int alloc_spec = 0, nr_spec = 0, i, ret;
1021
1022         do {
1023                 if (starts_with(buf->buf, "push ")) {
1024                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
1025                         specs[nr_spec++] = xstrdup(buf->buf + 5);
1026                 }
1027                 else
1028                         die("http transport does not support %s", buf->buf);
1029
1030                 strbuf_reset(buf);
1031                 if (strbuf_getline_lf(buf, stdin) == EOF)
1032                         goto free_specs;
1033                 if (!*buf->buf)
1034                         break;
1035         } while (1);
1036
1037         ret = push(nr_spec, specs);
1038         printf("\n");
1039         fflush(stdout);
1040
1041         if (ret)
1042                 exit(128); /* error already reported */
1043
1044  free_specs:
1045         for (i = 0; i < nr_spec; i++)
1046                 free(specs[i]);
1047         free(specs);
1048 }
1049
1050 int cmd_main(int argc, const char **argv)
1051 {
1052         struct strbuf buf = STRBUF_INIT;
1053         int nongit;
1054
1055         setup_git_directory_gently(&nongit);
1056         if (argc < 2) {
1057                 error("remote-curl: usage: git remote-curl <remote> [<url>]");
1058                 return 1;
1059         }
1060
1061         options.verbosity = 1;
1062         options.progress = !!isatty(2);
1063         options.thin = 1;
1064         string_list_init(&options.deepen_not, 1);
1065         string_list_init(&options.push_options, 1);
1066
1067         remote = remote_get(argv[1]);
1068
1069         if (argc > 2) {
1070                 end_url_with_slash(&url, argv[2]);
1071         } else {
1072                 end_url_with_slash(&url, remote->url[0]);
1073         }
1074
1075         http_init(remote, url.buf, 0);
1076
1077         do {
1078                 const char *arg;
1079
1080                 if (strbuf_getline_lf(&buf, stdin) == EOF) {
1081                         if (ferror(stdin))
1082                                 error("remote-curl: error reading command stream from git");
1083                         return 1;
1084                 }
1085                 if (buf.len == 0)
1086                         break;
1087                 if (starts_with(buf.buf, "fetch ")) {
1088                         if (nongit)
1089                                 die("remote-curl: fetch attempted without a local repo");
1090                         parse_fetch(&buf);
1091
1092                 } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1093                         int for_push = !!strstr(buf.buf + 4, "for-push");
1094                         output_refs(get_refs(for_push));
1095
1096                 } else if (starts_with(buf.buf, "push ")) {
1097                         parse_push(&buf);
1098
1099                 } else if (skip_prefix(buf.buf, "option ", &arg)) {
1100                         char *value = strchr(arg, ' ');
1101                         int result;
1102
1103                         if (value)
1104                                 *value++ = '\0';
1105                         else
1106                                 value = "true";
1107
1108                         result = set_option(arg, value);
1109                         if (!result)
1110                                 printf("ok\n");
1111                         else if (result < 0)
1112                                 printf("error invalid value\n");
1113                         else
1114                                 printf("unsupported\n");
1115                         fflush(stdout);
1116
1117                 } else if (!strcmp(buf.buf, "capabilities")) {
1118                         printf("fetch\n");
1119                         printf("option\n");
1120                         printf("push\n");
1121                         printf("check-connectivity\n");
1122                         printf("\n");
1123                         fflush(stdout);
1124                 } else {
1125                         error("remote-curl: unknown command '%s' from git", buf.buf);
1126                         return 1;
1127                 }
1128                 strbuf_reset(&buf);
1129         } while (1);
1130
1131         http_cleanup();
1132
1133         return 0;
1134 }