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