remote-curl.c

   1 #include "cache.h"
   2 #include "remote.h"
   3 #include "strbuf.h"
   4 #include "walker.h"
   5 #include "http.h"
   6 #include "exec_cmd.h"
   7 #include "run-command.h"
   8 #include "pkt-line.h"
   9 #include "string-list.h"
  10 #include "sideband.h"
  11 #include "argv-array.h"
  12 #include "credential.h"
  13 #include "sha1-array.h"
  14 #include "send-pack.h"
  15
  16 static struct remote *remote;
  17 /* always ends with a trailing slash */
  18 static struct strbuf url = STRBUF_INIT;
  19
  20 struct options {
  21         int verbosity;
  22         unsigned long depth;
  23         char *deepen_since;
  24         struct string_list deepen_not;
  25         unsigned progress : 1,
  26                 check_self_contained_and_connected : 1,
  27                 cloning : 1,
  28                 update_shallow : 1,
  29                 followtags : 1,
  30                 dry_run : 1,
  31                 thin : 1,
  32                 /* One of the SEND_PACK_PUSH_CERT_* constants. */
  33                 push_cert : 2,
  34                 deepen_relative : 1;
  35 };
  36 static struct options options;
  37 static struct string_list cas_options = STRING_LIST_INIT_DUP;
  38
  39 static int set_option(const char *name, const char *value)
  40 {
  41         if (!strcmp(name, "verbosity")) {
  42                 char *end;
  43                 int v = strtol(value, &end, 10);
  44                 if (value == end || *end)
  45                         return -1;
  46                 options.verbosity = v;
  47                 return 0;
  48         }
  49         else if (!strcmp(name, "progress")) {
  50                 if (!strcmp(value, "true"))
  51                         options.progress = 1;
  52                 else if (!strcmp(value, "false"))
  53                         options.progress = 0;
  54                 else
  55                         return -1;
  56                 return 0;
  57         }
  58         else if (!strcmp(name, "depth")) {
  59                 char *end;
  60                 unsigned long v = strtoul(value, &end, 10);
  61                 if (value == end || *end)
  62                         return -1;
  63                 options.depth = v;
  64                 return 0;
  65         }
  66         else if (!strcmp(name, "deepen-since")) {
  67                 options.deepen_since = xstrdup(value);
  68                 return 0;
  69         }
  70         else if (!strcmp(name, "deepen-not")) {
  71                 string_list_append(&options.deepen_not, value);
  72                 return 0;
  73         }
  74         else if (!strcmp(name, "deepen-relative")) {
  75                 if (!strcmp(value, "true"))
  76                         options.deepen_relative = 1;
  77                 else if (!strcmp(value, "false"))
  78                         options.deepen_relative = 0;
  79                 else
  80                         return -1;
  81                 return 0;
  82         }
  83         else if (!strcmp(name, "followtags")) {
  84                 if (!strcmp(value, "true"))
  85                         options.followtags = 1;
  86                 else if (!strcmp(value, "false"))
  87                         options.followtags = 0;
  88                 else
  89                         return -1;
  90                 return 0;
  91         }
  92         else if (!strcmp(name, "dry-run")) {
  93                 if (!strcmp(value, "true"))
  94                         options.dry_run = 1;
  95                 else if (!strcmp(value, "false"))
  96                         options.dry_run = 0;
  97                 else
  98                         return -1;
  99                 return 0;
 100         }
 101         else if (!strcmp(name, "check-connectivity")) {
 102                 if (!strcmp(value, "true"))
 103                         options.check_self_contained_and_connected = 1;
 104                 else if (!strcmp(value, "false"))
 105                         options.check_self_contained_and_connected = 0;
 106                 else
 107                         return -1;
 108                 return 0;
 109         }
 110         else if (!strcmp(name, "cas")) {
 111                 struct strbuf val = STRBUF_INIT;
 112                 strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
 113                 string_list_append(&cas_options, val.buf);
 114                 strbuf_release(&val);
 115                 return 0;
 116         } else if (!strcmp(name, "cloning")) {
 117                 if (!strcmp(value, "true"))
 118                         options.cloning = 1;
 119                 else if (!strcmp(value, "false"))
 120                         options.cloning = 0;
 121                 else
 122                         return -1;
 123                 return 0;
 124         } else if (!strcmp(name, "update-shallow")) {
 125                 if (!strcmp(value, "true"))
 126                         options.update_shallow = 1;
 127                 else if (!strcmp(value, "false"))
 128                         options.update_shallow = 0;
 129                 else
 130                         return -1;
 131                 return 0;
 132         } else if (!strcmp(name, "pushcert")) {
 133                 if (!strcmp(value, "true"))
 134                         options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 135                 else if (!strcmp(value, "false"))
 136                         options.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 137                 else if (!strcmp(value, "if-asked"))
 138                         options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 139                 else
 140                         return -1;
 141                 return 0;
 142
 143 #if LIBCURL_VERSION_NUM >= 0x070a08
 144         } else if (!strcmp(name, "family")) {
 145                 if (!strcmp(value, "ipv4"))
 146                         git_curl_ipresolve = CURL_IPRESOLVE_V4;
 147                 else if (!strcmp(value, "ipv6"))
 148                         git_curl_ipresolve = CURL_IPRESOLVE_V6;
 149                 else if (!strcmp(value, "all"))
 150                         git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
 151                 else
 152                         return -1;
 153                 return 0;
 154 #endif /* LIBCURL_VERSION_NUM >= 0x070a08 */
 155         } else {
 156                 return 1 /* unsupported */;
 157         }
 158 }
 159
 160 struct discovery {
 161         const char *service;
 162         char *buf_alloc;
 163         char *buf;
 164         size_t len;
 165         struct ref *refs;
 166         struct sha1_array shallow;
 167         unsigned proto_git : 1;
 168 };
 169 static struct discovery *last_discovery;
 170
 171 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 172 {
 173         struct ref *list = NULL;
 174         get_remote_heads(-1, heads->buf, heads->len, &list,
 175                          for_push ? REF_NORMAL : 0, NULL, &heads->shallow);
 176         return list;
 177 }
 178
 179 static struct ref *parse_info_refs(struct discovery *heads)
 180 {
 181         char *data, *start, *mid;
 182         char *ref_name;
 183         int i = 0;
 184
 185         struct ref *refs = NULL;
 186         struct ref *ref = NULL;
 187         struct ref *last_ref = NULL;
 188
 189         data = heads->buf;
 190         start = NULL;
 191         mid = data;
 192         while (i < heads->len) {
 193                 if (!start) {
 194                         start = &data[i];
 195                 }
 196                 if (data[i] == '\t')
 197                         mid = &data[i];
 198                 if (data[i] == '\n') {
 199                         if (mid - start != 40)
 200                                 die("%sinfo/refs not valid: is this a git repository?",
 201                                     url.buf);
 202                         data[i] = 0;
 203                         ref_name = mid + 1;
 204                         ref = alloc_ref(ref_name);
 205                         get_oid_hex(start, &ref->old_oid);
 206                         if (!refs)
 207                                 refs = ref;
 208                         if (last_ref)
 209                                 last_ref->next = ref;
 210                         last_ref = ref;
 211                         start = NULL;
 212                 }
 213                 i++;
 214         }
 215
 216         ref = alloc_ref("HEAD");
 217         if (!http_fetch_ref(url.buf, ref) &&
 218             !resolve_remote_symref(ref, refs)) {
 219                 ref->next = refs;
 220                 refs = ref;
 221         } else {
 222                 free(ref);
 223         }
 224
 225         return refs;
 226 }
 227
 228 static void free_discovery(struct discovery *d)
 229 {
 230         if (d) {
 231                 if (d == last_discovery)
 232                         last_discovery = NULL;
 233                 free(d->shallow.sha1);
 234                 free(d->buf_alloc);
 235                 free_refs(d->refs);
 236                 free(d);
 237         }
 238 }
 239
 240 static int show_http_message(struct strbuf *type, struct strbuf *charset,
 241                              struct strbuf *msg)
 242 {
 243         const char *p, *eol;
 244
 245         /*
 246          * We only show text/plain parts, as other types are likely
 247          * to be ugly to look at on the user's terminal.
 248          */
 249         if (strcmp(type->buf, "text/plain"))
 250                 return -1;
 251         if (charset->len)
 252                 strbuf_reencode(msg, charset->buf, get_log_output_encoding());
 253
 254         strbuf_trim(msg);
 255         if (!msg->len)
 256                 return -1;
 257
 258         p = msg->buf;
 259         do {
 260                 eol = strchrnul(p, '\n');
 261                 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 262                 p = eol + 1;
 263         } while(*eol);
 264         return 0;
 265 }
 266
 267 static struct discovery *discover_refs(const char *service, int for_push)
 268 {
 269         struct strbuf exp = STRBUF_INIT;
 270         struct strbuf type = STRBUF_INIT;
 271         struct strbuf charset = STRBUF_INIT;
 272         struct strbuf buffer = STRBUF_INIT;
 273         struct strbuf refs_url = STRBUF_INIT;
 274         struct strbuf effective_url = STRBUF_INIT;
 275         struct discovery *last = last_discovery;
 276         int http_ret, maybe_smart = 0;
 277         struct http_get_options options;
 278
 279         if (last && !strcmp(service, last->service))
 280                 return last;
 281         free_discovery(last);
 282
 283         strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 284         if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 285              git_env_bool("GIT_SMART_HTTP", 1)) {
 286                 maybe_smart = 1;
 287                 if (!strchr(url.buf, '?'))
 288                         strbuf_addch(&refs_url, '?');
 289                 else
 290                         strbuf_addch(&refs_url, '&');
 291                 strbuf_addf(&refs_url, "service=%s", service);
 292         }
 293
 294         memset(&options, 0, sizeof(options));
 295         options.content_type = &type;
 296         options.charset = &charset;
 297         options.effective_url = &effective_url;
 298         options.base_url = &url;
 299         options.no_cache = 1;
 300         options.keep_error = 1;
 301
 302         http_ret = http_get_strbuf(refs_url.buf, &buffer, &options);
 303         switch (http_ret) {
 304         case HTTP_OK:
 305                 break;
 306         case HTTP_MISSING_TARGET:
 307                 show_http_message(&type, &charset, &buffer);
 308                 die("repository '%s' not found", url.buf);
 309         case HTTP_NOAUTH:
 310                 show_http_message(&type, &charset, &buffer);
 311                 die("Authentication failed for '%s'", url.buf);
 312         default:
 313                 show_http_message(&type, &charset, &buffer);
 314                 die("unable to access '%s': %s", url.buf, curl_errorstr);
 315         }
 316
 317         last= xcalloc(1, sizeof(*last_discovery));
 318         last->service = service;
 319         last->buf_alloc = strbuf_detach(&buffer, &last->len);
 320         last->buf = last->buf_alloc;
 321
 322         strbuf_addf(&exp, "application/x-%s-advertisement", service);
 323         if (maybe_smart &&
 324             (5 <= last->len && last->buf[4] == '#') &&
 325             !strbuf_cmp(&exp, &type)) {
 326                 char *line;
 327
 328                 /*
 329                  * smart HTTP response; validate that the service
 330                  * pkt-line matches our request.
 331                  */
 332                 line = packet_read_line_buf(&last->buf, &last->len, NULL);
 333
 334                 strbuf_reset(&exp);
 335                 strbuf_addf(&exp, "# service=%s", service);
 336                 if (strcmp(line, exp.buf))
 337                         die("invalid server response; got '%s'", line);
 338                 strbuf_release(&exp);
 339
 340                 /* The header can include additional metadata lines, up
 341                  * until a packet flush marker.  Ignore these now, but
 342                  * in the future we might start to scan them.
 343                  */
 344                 while (packet_read_line_buf(&last->buf, &last->len, NULL))
 345                         ;
 346
 347                 last->proto_git = 1;
 348         }
 349
 350         if (last->proto_git)
 351                 last->refs = parse_git_refs(last, for_push);
 352         else
 353                 last->refs = parse_info_refs(last);
 354
 355         strbuf_release(&refs_url);
 356         strbuf_release(&exp);
 357         strbuf_release(&type);
 358         strbuf_release(&charset);
 359         strbuf_release(&effective_url);
 360         strbuf_release(&buffer);
 361         last_discovery = last;
 362         return last;
 363 }
 364
 365 static struct ref *get_refs(int for_push)
 366 {
 367         struct discovery *heads;
 368
 369         if (for_push)
 370                 heads = discover_refs("git-receive-pack", for_push);
 371         else
 372                 heads = discover_refs("git-upload-pack", for_push);
 373
 374         return heads->refs;
 375 }
 376
 377 static void output_refs(struct ref *refs)
 378 {
 379         struct ref *posn;
 380         for (posn = refs; posn; posn = posn->next) {
 381                 if (posn->symref)
 382                         printf("@%s %s\n", posn->symref, posn->name);
 383                 else
 384                         printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name);
 385         }
 386         printf("\n");
 387         fflush(stdout);
 388 }
 389
 390 struct rpc_state {
 391         const char *service_name;
 392         const char **argv;
 393         struct strbuf *stdin_preamble;
 394         char *service_url;
 395         char *hdr_content_type;
 396         char *hdr_accept;
 397         char *buf;
 398         size_t alloc;
 399         size_t len;
 400         size_t pos;
 401         int in;
 402         int out;
 403         struct strbuf result;
 404         unsigned gzip_request : 1;
 405         unsigned initial_buffer : 1;
 406 };
 407
 408 static size_t rpc_out(void *ptr, size_t eltsize,
 409                 size_t nmemb, void *buffer_)
 410 {
 411         size_t max = eltsize * nmemb;
 412         struct rpc_state *rpc = buffer_;
 413         size_t avail = rpc->len - rpc->pos;
 414
 415         if (!avail) {
 416                 rpc->initial_buffer = 0;
 417                 avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 418                 if (!avail)
 419                         return 0;
 420                 rpc->pos = 0;
 421                 rpc->len = avail;
 422         }
 423
 424         if (max < avail)
 425                 avail = max;
 426         memcpy(ptr, rpc->buf + rpc->pos, avail);
 427         rpc->pos += avail;
 428         return avail;
 429 }
 430
 431 #ifndef NO_CURL_IOCTL
 432 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 433 {
 434         struct rpc_state *rpc = clientp;
 435
 436         switch (cmd) {
 437         case CURLIOCMD_NOP:
 438                 return CURLIOE_OK;
 439
 440         case CURLIOCMD_RESTARTREAD:
 441                 if (rpc->initial_buffer) {
 442                         rpc->pos = 0;
 443                         return CURLIOE_OK;
 444                 }
 445                 error("unable to rewind rpc post data - try increasing http.postBuffer");
 446                 return CURLIOE_FAILRESTART;
 447
 448         default:
 449                 return CURLIOE_UNKNOWNCMD;
 450         }
 451 }
 452 #endif
 453
 454 static size_t rpc_in(char *ptr, size_t eltsize,
 455                 size_t nmemb, void *buffer_)
 456 {
 457         size_t size = eltsize * nmemb;
 458         struct rpc_state *rpc = buffer_;
 459         write_or_die(rpc->in, ptr, size);
 460         return size;
 461 }
 462
 463 static int run_slot(struct active_request_slot *slot,
 464                     struct slot_results *results)
 465 {
 466         int err;
 467         struct slot_results results_buf;
 468
 469         if (!results)
 470                 results = &results_buf;
 471
 472         err = run_one_slot(slot, results);
 473
 474         if (err != HTTP_OK && err != HTTP_REAUTH) {
 475                 struct strbuf msg = STRBUF_INIT;
 476                 if (results->http_code && results->http_code != 200)
 477                         strbuf_addf(&msg, "HTTP %ld", results->http_code);
 478                 if (results->curl_result != CURLE_OK) {
 479                         if (msg.len)
 480                                 strbuf_addch(&msg, ' ');
 481                         strbuf_addf(&msg, "curl %d", results->curl_result);
 482                         if (curl_errorstr[0]) {
 483                                 strbuf_addch(&msg, ' ');
 484                                 strbuf_addstr(&msg, curl_errorstr);
 485                         }
 486                 }
 487                 error("RPC failed; %s", msg.buf);
 488                 strbuf_release(&msg);
 489         }
 490
 491         return err;
 492 }
 493
 494 static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 495 {
 496         struct active_request_slot *slot;
 497         struct curl_slist *headers = http_copy_default_headers();
 498         struct strbuf buf = STRBUF_INIT;
 499         int err;
 500
 501         slot = get_active_slot();
 502
 503         headers = curl_slist_append(headers, rpc->hdr_content_type);
 504         headers = curl_slist_append(headers, rpc->hdr_accept);
 505
 506         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 507         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 508         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 509         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 510         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 511         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 512         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 513         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 514         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 515
 516         err = run_slot(slot, results);
 517
 518         curl_slist_free_all(headers);
 519         strbuf_release(&buf);
 520         return err;
 521 }
 522
 523 static int post_rpc(struct rpc_state *rpc)
 524 {
 525         struct active_request_slot *slot;
 526         struct curl_slist *headers = http_copy_default_headers();
 527         int use_gzip = rpc->gzip_request;
 528         char *gzip_body = NULL;
 529         size_t gzip_size = 0;
 530         int err, large_request = 0;
 531         int needs_100_continue = 0;
 532
 533         /* Try to load the entire request, if we can fit it into the
 534          * allocated buffer space we can use HTTP/1.0 and avoid the
 535          * chunked encoding mess.
 536          */
 537         while (1) {
 538                 size_t left = rpc->alloc - rpc->len;
 539                 char *buf = rpc->buf + rpc->len;
 540                 int n;
 541
 542                 if (left < LARGE_PACKET_MAX) {
 543                         large_request = 1;
 544                         use_gzip = 0;
 545                         break;
 546                 }
 547
 548                 n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 549                 if (!n)
 550                         break;
 551                 rpc->len += n;
 552         }
 553
 554         if (large_request) {
 555                 struct slot_results results;
 556
 557                 do {
 558                         err = probe_rpc(rpc, &results);
 559                         if (err == HTTP_REAUTH)
 560                                 credential_fill(&http_auth);
 561                 } while (err == HTTP_REAUTH);
 562                 if (err != HTTP_OK)
 563                         return -1;
 564
 565                 if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 566                         needs_100_continue = 1;
 567         }
 568
 569         headers = curl_slist_append(headers, rpc->hdr_content_type);
 570         headers = curl_slist_append(headers, rpc->hdr_accept);
 571         headers = curl_slist_append(headers, needs_100_continue ?
 572                 "Expect: 100-continue" : "Expect:");
 573
 574 retry:
 575         slot = get_active_slot();
 576
 577         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 578         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 579         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 580         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 581
 582         if (large_request) {
 583                 /* The request body is large and the size cannot be predicted.
 584                  * We must use chunked encoding to send it.
 585                  */
 586                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 587                 rpc->initial_buffer = 1;
 588                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 589                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 590 #ifndef NO_CURL_IOCTL
 591                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 592                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 593 #endif
 594                 if (options.verbosity > 1) {
 595                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 596                         fflush(stderr);
 597                 }
 598
 599         } else if (gzip_body) {
 600                 /*
 601                  * If we are looping to retry authentication, then the previous
 602                  * run will have set up the headers and gzip buffer already,
 603                  * and we just need to send it.
 604                  */
 605                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 606                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 607
 608         } else if (use_gzip && 1024 < rpc->len) {
 609                 /* The client backend isn't giving us compressed data so
 610                  * we can try to deflate it ourselves, this may save on.
 611                  * the transfer time.
 612                  */
 613                 git_zstream stream;
 614                 int ret;
 615
 616                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 617                 gzip_size = git_deflate_bound(&stream, rpc->len);
 618                 gzip_body = xmalloc(gzip_size);
 619
 620                 stream.next_in = (unsigned char *)rpc->buf;
 621                 stream.avail_in = rpc->len;
 622                 stream.next_out = (unsigned char *)gzip_body;
 623                 stream.avail_out = gzip_size;
 624
 625                 ret = git_deflate(&stream, Z_FINISH);
 626                 if (ret != Z_STREAM_END)
 627                         die("cannot deflate request; zlib deflate error %d", ret);
 628
 629                 ret = git_deflate_end_gently(&stream);
 630                 if (ret != Z_OK)
 631                         die("cannot deflate request; zlib end error %d", ret);
 632
 633                 gzip_size = stream.total_out;
 634
 635                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 636                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 637                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 638
 639                 if (options.verbosity > 1) {
 640                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 641                                 rpc->service_name,
 642                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
 643                         fflush(stderr);
 644                 }
 645         } else {
 646                 /* We know the complete request size in advance, use the
 647                  * more normal Content-Length approach.
 648                  */
 649                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 650                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 651                 if (options.verbosity > 1) {
 652                         fprintf(stderr, "POST %s (%lu bytes)\n",
 653                                 rpc->service_name, (unsigned long)rpc->len);
 654                         fflush(stderr);
 655                 }
 656         }
 657
 658         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 659         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 660         curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 661
 662         err = run_slot(slot, NULL);
 663         if (err == HTTP_REAUTH && !large_request) {
 664                 credential_fill(&http_auth);
 665                 goto retry;
 666         }
 667         if (err != HTTP_OK)
 668                 err = -1;
 669
 670         curl_slist_free_all(headers);
 671         free(gzip_body);
 672         return err;
 673 }
 674
 675 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 676 {
 677         const char *svc = rpc->service_name;
 678         struct strbuf buf = STRBUF_INIT;
 679         struct strbuf *preamble = rpc->stdin_preamble;
 680         struct child_process client = CHILD_PROCESS_INIT;
 681         int err = 0;
 682
 683         client.in = -1;
 684         client.out = -1;
 685         client.git_cmd = 1;
 686         client.argv = rpc->argv;
 687         if (start_command(&client))
 688                 exit(1);
 689         if (preamble)
 690                 write_or_die(client.in, preamble->buf, preamble->len);
 691         if (heads)
 692                 write_or_die(client.in, heads->buf, heads->len);
 693
 694         rpc->alloc = http_post_buffer;
 695         rpc->buf = xmalloc(rpc->alloc);
 696         rpc->in = client.in;
 697         rpc->out = client.out;
 698         strbuf_init(&rpc->result, 0);
 699
 700         strbuf_addf(&buf, "%s%s", url.buf, svc);
 701         rpc->service_url = strbuf_detach(&buf, NULL);
 702
 703         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 704         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 705
 706         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 707         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 708
 709         while (!err) {
 710                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 711                 if (!n)
 712                         break;
 713                 rpc->pos = 0;
 714                 rpc->len = n;
 715                 err |= post_rpc(rpc);
 716         }
 717
 718         close(client.in);
 719         client.in = -1;
 720         if (!err) {
 721                 strbuf_read(&rpc->result, client.out, 0);
 722         } else {
 723                 char buf[4096];
 724                 for (;;)
 725                         if (xread(client.out, buf, sizeof(buf)) <= 0)
 726                                 break;
 727         }
 728
 729         close(client.out);
 730         client.out = -1;
 731
 732         err |= finish_command(&client);
 733         free(rpc->service_url);
 734         free(rpc->hdr_content_type);
 735         free(rpc->hdr_accept);
 736         free(rpc->buf);
 737         strbuf_release(&buf);
 738         return err;
 739 }
 740
 741 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 742 {
 743         struct walker *walker;
 744         char **targets;
 745         int ret, i;
 746
 747         ALLOC_ARRAY(targets, nr_heads);
 748         if (options.depth || options.deepen_since)
 749                 die("dumb http transport does not support shallow capabilities");
 750         for (i = 0; i < nr_heads; i++)
 751                 targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
 752
 753         walker = get_http_walker(url.buf);
 754         walker->get_all = 1;
 755         walker->get_tree = 1;
 756         walker->get_history = 1;
 757         walker->get_verbosely = options.verbosity >= 3;
 758         walker->get_recover = 0;
 759         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 760         walker_free(walker);
 761
 762         for (i = 0; i < nr_heads; i++)
 763                 free(targets[i]);
 764         free(targets);
 765
 766         return ret ? error("fetch failed.") : 0;
 767 }
 768
 769 static int fetch_git(struct discovery *heads,
 770         int nr_heads, struct ref **to_fetch)
 771 {
 772         struct rpc_state rpc;
 773         struct strbuf preamble = STRBUF_INIT;
 774         int i, err;
 775         struct argv_array args = ARGV_ARRAY_INIT;
 776
 777         argv_array_pushl(&args, "fetch-pack", "--stateless-rpc",
 778                          "--stdin", "--lock-pack", NULL);
 779         if (options.followtags)
 780                 argv_array_push(&args, "--include-tag");
 781         if (options.thin)
 782                 argv_array_push(&args, "--thin");
 783         if (options.verbosity >= 3)
 784                 argv_array_pushl(&args, "-v", "-v", NULL);
 785         if (options.check_self_contained_and_connected)
 786                 argv_array_push(&args, "--check-self-contained-and-connected");
 787         if (options.cloning)
 788                 argv_array_push(&args, "--cloning");
 789         if (options.update_shallow)
 790                 argv_array_push(&args, "--update-shallow");
 791         if (!options.progress)
 792                 argv_array_push(&args, "--no-progress");
 793         if (options.depth)
 794                 argv_array_pushf(&args, "--depth=%lu", options.depth);
 795         if (options.deepen_since)
 796                 argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since);
 797         for (i = 0; i < options.deepen_not.nr; i++)
 798                 argv_array_pushf(&args, "--shallow-exclude=%s",
 799                                  options.deepen_not.items[i].string);
 800         if (options.deepen_relative && options.depth)
 801                 argv_array_push(&args, "--deepen-relative");
 802         argv_array_push(&args, url.buf);
 803
 804         for (i = 0; i < nr_heads; i++) {
 805                 struct ref *ref = to_fetch[i];
 806                 if (!*ref->name)
 807                         die("cannot fetch by sha1 over smart http");
 808                 packet_buf_write(&preamble, "%s %s\n",
 809                                  oid_to_hex(&ref->old_oid), ref->name);
 810         }
 811         packet_buf_flush(&preamble);
 812
 813         memset(&rpc, 0, sizeof(rpc));
 814         rpc.service_name = "git-upload-pack",
 815         rpc.argv = args.argv;
 816         rpc.stdin_preamble = &preamble;
 817         rpc.gzip_request = 1;
 818
 819         err = rpc_service(&rpc, heads);
 820         if (rpc.result.len)
 821                 write_or_die(1, rpc.result.buf, rpc.result.len);
 822         strbuf_release(&rpc.result);
 823         strbuf_release(&preamble);
 824         argv_array_clear(&args);
 825         return err;
 826 }
 827
 828 static int fetch(int nr_heads, struct ref **to_fetch)
 829 {
 830         struct discovery *d = discover_refs("git-upload-pack", 0);
 831         if (d->proto_git)
 832                 return fetch_git(d, nr_heads, to_fetch);
 833         else
 834                 return fetch_dumb(nr_heads, to_fetch);
 835 }
 836
 837 static void parse_fetch(struct strbuf *buf)
 838 {
 839         struct ref **to_fetch = NULL;
 840         struct ref *list_head = NULL;
 841         struct ref **list = &list_head;
 842         int alloc_heads = 0, nr_heads = 0;
 843
 844         do {
 845                 const char *p;
 846                 if (skip_prefix(buf->buf, "fetch ", &p)) {
 847                         const char *name;
 848                         struct ref *ref;
 849                         struct object_id old_oid;
 850
 851                         if (get_oid_hex(p, &old_oid))
 852                                 die("protocol error: expected sha/ref, got %s'", p);
 853                         if (p[GIT_SHA1_HEXSZ] == ' ')
 854                                 name = p + GIT_SHA1_HEXSZ + 1;
 855                         else if (!p[GIT_SHA1_HEXSZ])
 856                                 name = "";
 857                         else
 858                                 die("protocol error: expected sha/ref, got %s'", p);
 859
 860                         ref = alloc_ref(name);
 861                         oidcpy(&ref->old_oid, &old_oid);
 862
 863                         *list = ref;
 864                         list = &ref->next;
 865
 866                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 867                         to_fetch[nr_heads++] = ref;
 868                 }
 869                 else
 870                         die("http transport does not support %s", buf->buf);
 871
 872                 strbuf_reset(buf);
 873                 if (strbuf_getline_lf(buf, stdin) == EOF)
 874                         return;
 875                 if (!*buf->buf)
 876                         break;
 877         } while (1);
 878
 879         if (fetch(nr_heads, to_fetch))
 880                 exit(128); /* error already reported */
 881         free_refs(list_head);
 882         free(to_fetch);
 883
 884         printf("\n");
 885         fflush(stdout);
 886         strbuf_reset(buf);
 887 }
 888
 889 static int push_dav(int nr_spec, char **specs)
 890 {
 891         struct child_process child = CHILD_PROCESS_INIT;
 892         size_t i;
 893
 894         child.git_cmd = 1;
 895         argv_array_push(&child.args, "http-push");
 896         argv_array_push(&child.args, "--helper-status");
 897         if (options.dry_run)
 898                 argv_array_push(&child.args, "--dry-run");
 899         if (options.verbosity > 1)
 900                 argv_array_push(&child.args, "--verbose");
 901         argv_array_push(&child.args, url.buf);
 902         for (i = 0; i < nr_spec; i++)
 903                 argv_array_push(&child.args, specs[i]);
 904
 905         if (run_command(&child))
 906                 die("git-http-push failed");
 907         return 0;
 908 }
 909
 910 static int push_git(struct discovery *heads, int nr_spec, char **specs)
 911 {
 912         struct rpc_state rpc;
 913         int i, err;
 914         struct argv_array args;
 915         struct string_list_item *cas_option;
 916         struct strbuf preamble = STRBUF_INIT;
 917
 918         argv_array_init(&args);
 919         argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 920                          NULL);
 921
 922         if (options.thin)
 923                 argv_array_push(&args, "--thin");
 924         if (options.dry_run)
 925                 argv_array_push(&args, "--dry-run");
 926         if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
 927                 argv_array_push(&args, "--signed=yes");
 928         else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
 929                 argv_array_push(&args, "--signed=if-asked");
 930         if (options.verbosity == 0)
 931                 argv_array_push(&args, "--quiet");
 932         else if (options.verbosity > 1)
 933                 argv_array_push(&args, "--verbose");
 934         argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 935         for_each_string_list_item(cas_option, &cas_options)
 936                 argv_array_push(&args, cas_option->string);
 937         argv_array_push(&args, url.buf);
 938
 939         argv_array_push(&args, "--stdin");
 940         for (i = 0; i < nr_spec; i++)
 941                 packet_buf_write(&preamble, "%s\n", specs[i]);
 942         packet_buf_flush(&preamble);
 943
 944         memset(&rpc, 0, sizeof(rpc));
 945         rpc.service_name = "git-receive-pack",
 946         rpc.argv = args.argv;
 947         rpc.stdin_preamble = &preamble;
 948
 949         err = rpc_service(&rpc, heads);
 950         if (rpc.result.len)
 951                 write_or_die(1, rpc.result.buf, rpc.result.len);
 952         strbuf_release(&rpc.result);
 953         strbuf_release(&preamble);
 954         argv_array_clear(&args);
 955         return err;
 956 }
 957
 958 static int push(int nr_spec, char **specs)
 959 {
 960         struct discovery *heads = discover_refs("git-receive-pack", 1);
 961         int ret;
 962
 963         if (heads->proto_git)
 964                 ret = push_git(heads, nr_spec, specs);
 965         else
 966                 ret = push_dav(nr_spec, specs);
 967         free_discovery(heads);
 968         return ret;
 969 }
 970
 971 static void parse_push(struct strbuf *buf)
 972 {
 973         char **specs = NULL;
 974         int alloc_spec = 0, nr_spec = 0, i, ret;
 975
 976         do {
 977                 if (starts_with(buf->buf, "push ")) {
 978                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 979                         specs[nr_spec++] = xstrdup(buf->buf + 5);
 980                 }
 981                 else
 982                         die("http transport does not support %s", buf->buf);
 983
 984                 strbuf_reset(buf);
 985                 if (strbuf_getline_lf(buf, stdin) == EOF)
 986                         goto free_specs;
 987                 if (!*buf->buf)
 988                         break;
 989         } while (1);
 990
 991         ret = push(nr_spec, specs);
 992         printf("\n");
 993         fflush(stdout);
 994
 995         if (ret)
 996                 exit(128); /* error already reported */
 997
 998  free_specs:
 999         for (i = 0; i < nr_spec; i++)
1000                 free(specs[i]);
1001         free(specs);
1002 }
1003
1004 int cmd_main(int argc, const char **argv)
1005 {
1006         struct strbuf buf = STRBUF_INIT;
1007         int nongit;
1008
1009         setup_git_directory_gently(&nongit);
1010         if (argc < 2) {
1011                 error("remote-curl: usage: git remote-curl <remote> [<url>]");
1012                 return 1;
1013         }
1014
1015         options.verbosity = 1;
1016         options.progress = !!isatty(2);
1017         options.thin = 1;
1018         string_list_init(&options.deepen_not, 1);
1019
1020         remote = remote_get(argv[1]);
1021
1022         if (argc > 2) {
1023                 end_url_with_slash(&url, argv[2]);
1024         } else {
1025                 end_url_with_slash(&url, remote->url[0]);
1026         }
1027
1028         http_init(remote, url.buf, 0);
1029
1030         do {
1031                 const char *arg;
1032
1033                 if (strbuf_getline_lf(&buf, stdin) == EOF) {
1034                         if (ferror(stdin))
1035                                 error("remote-curl: error reading command stream from git");
1036                         return 1;
1037                 }
1038                 if (buf.len == 0)
1039                         break;
1040                 if (starts_with(buf.buf, "fetch ")) {
1041                         if (nongit)
1042                                 die("remote-curl: fetch attempted without a local repo");
1043                         parse_fetch(&buf);
1044
1045                 } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1046                         int for_push = !!strstr(buf.buf + 4, "for-push");
1047                         output_refs(get_refs(for_push));
1048
1049                 } else if (starts_with(buf.buf, "push ")) {
1050                         parse_push(&buf);
1051
1052                 } else if (skip_prefix(buf.buf, "option ", &arg)) {
1053                         char *value = strchr(arg, ' ');
1054                         int result;
1055
1056                         if (value)
1057                                 *value++ = '\0';
1058                         else
1059                                 value = "true";
1060
1061                         result = set_option(arg, value);
1062                         if (!result)
1063                                 printf("ok\n");
1064                         else if (result < 0)
1065                                 printf("error invalid value\n");
1066                         else
1067                                 printf("unsupported\n");
1068                         fflush(stdout);
1069
1070                 } else if (!strcmp(buf.buf, "capabilities")) {
1071                         printf("fetch\n");
1072                         printf("option\n");
1073                         printf("push\n");
1074                         printf("check-connectivity\n");
1075                         printf("\n");
1076                         fflush(stdout);
1077                 } else {
1078                         error("remote-curl: unknown command '%s' from git", buf.buf);
1079                         return 1;
1080                 }
1081                 strbuf_reset(&buf);
1082         } while (1);
1083
1084         http_cleanup();
1085
1086         return 0;
1087 }