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         unsigned progress : 1,
  24                 check_self_contained_and_connected : 1,
  25                 cloning : 1,
  26                 update_shallow : 1,
  27                 followtags : 1,
  28                 dry_run : 1,
  29                 thin : 1,
  30                 /* One of the SEND_PACK_PUSH_CERT_* constants. */
  31                 push_cert : 2;
  32 };
  33 static struct options options;
  34 static struct string_list cas_options = STRING_LIST_INIT_DUP;
  35
  36 static int set_option(const char *name, const char *value)
  37 {
  38         if (!strcmp(name, "verbosity")) {
  39                 char *end;
  40                 int v = strtol(value, &end, 10);
  41                 if (value == end || *end)
  42                         return -1;
  43                 options.verbosity = v;
  44                 return 0;
  45         }
  46         else if (!strcmp(name, "progress")) {
  47                 if (!strcmp(value, "true"))
  48                         options.progress = 1;
  49                 else if (!strcmp(value, "false"))
  50                         options.progress = 0;
  51                 else
  52                         return -1;
  53                 return 0;
  54         }
  55         else if (!strcmp(name, "depth")) {
  56                 char *end;
  57                 unsigned long v = strtoul(value, &end, 10);
  58                 if (value == end || *end)
  59                         return -1;
  60                 options.depth = v;
  61                 return 0;
  62         }
  63         else if (!strcmp(name, "followtags")) {
  64                 if (!strcmp(value, "true"))
  65                         options.followtags = 1;
  66                 else if (!strcmp(value, "false"))
  67                         options.followtags = 0;
  68                 else
  69                         return -1;
  70                 return 0;
  71         }
  72         else if (!strcmp(name, "dry-run")) {
  73                 if (!strcmp(value, "true"))
  74                         options.dry_run = 1;
  75                 else if (!strcmp(value, "false"))
  76                         options.dry_run = 0;
  77                 else
  78                         return -1;
  79                 return 0;
  80         }
  81         else if (!strcmp(name, "check-connectivity")) {
  82                 if (!strcmp(value, "true"))
  83                         options.check_self_contained_and_connected = 1;
  84                 else if (!strcmp(value, "false"))
  85                         options.check_self_contained_and_connected = 0;
  86                 else
  87                         return -1;
  88                 return 0;
  89         }
  90         else if (!strcmp(name, "cas")) {
  91                 struct strbuf val = STRBUF_INIT;
  92                 strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
  93                 string_list_append(&cas_options, val.buf);
  94                 strbuf_release(&val);
  95                 return 0;
  96         } else if (!strcmp(name, "cloning")) {
  97                 if (!strcmp(value, "true"))
  98                         options.cloning = 1;
  99                 else if (!strcmp(value, "false"))
 100                         options.cloning = 0;
 101                 else
 102                         return -1;
 103                 return 0;
 104         } else if (!strcmp(name, "update-shallow")) {
 105                 if (!strcmp(value, "true"))
 106                         options.update_shallow = 1;
 107                 else if (!strcmp(value, "false"))
 108                         options.update_shallow = 0;
 109                 else
 110                         return -1;
 111                 return 0;
 112         } else if (!strcmp(name, "pushcert")) {
 113                 if (!strcmp(value, "true"))
 114                         options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 115                 else if (!strcmp(value, "false"))
 116                         options.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 117                 else if (!strcmp(value, "if-asked"))
 118                         options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 119                 else
 120                         return -1;
 121                 return 0;
 122         } else {
 123                 return 1 /* unsupported */;
 124         }
 125 }
 126
 127 struct discovery {
 128         const char *service;
 129         char *buf_alloc;
 130         char *buf;
 131         size_t len;
 132         struct ref *refs;
 133         struct sha1_array shallow;
 134         unsigned proto_git : 1;
 135 };
 136 static struct discovery *last_discovery;
 137
 138 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 139 {
 140         struct ref *list = NULL;
 141         get_remote_heads(-1, heads->buf, heads->len, &list,
 142                          for_push ? REF_NORMAL : 0, NULL, &heads->shallow);
 143         return list;
 144 }
 145
 146 static struct ref *parse_info_refs(struct discovery *heads)
 147 {
 148         char *data, *start, *mid;
 149         char *ref_name;
 150         int i = 0;
 151
 152         struct ref *refs = NULL;
 153         struct ref *ref = NULL;
 154         struct ref *last_ref = NULL;
 155
 156         data = heads->buf;
 157         start = NULL;
 158         mid = data;
 159         while (i < heads->len) {
 160                 if (!start) {
 161                         start = &data[i];
 162                 }
 163                 if (data[i] == '\t')
 164                         mid = &data[i];
 165                 if (data[i] == '\n') {
 166                         if (mid - start != 40)
 167                                 die("%sinfo/refs not valid: is this a git repository?",
 168                                     url.buf);
 169                         data[i] = 0;
 170                         ref_name = mid + 1;
 171                         ref = xmalloc(sizeof(struct ref) +
 172                                       strlen(ref_name) + 1);
 173                         memset(ref, 0, sizeof(struct ref));
 174                         strcpy(ref->name, ref_name);
 175                         get_sha1_hex(start, ref->old_sha1);
 176                         if (!refs)
 177                                 refs = ref;
 178                         if (last_ref)
 179                                 last_ref->next = ref;
 180                         last_ref = ref;
 181                         start = NULL;
 182                 }
 183                 i++;
 184         }
 185
 186         ref = alloc_ref("HEAD");
 187         if (!http_fetch_ref(url.buf, ref) &&
 188             !resolve_remote_symref(ref, refs)) {
 189                 ref->next = refs;
 190                 refs = ref;
 191         } else {
 192                 free(ref);
 193         }
 194
 195         return refs;
 196 }
 197
 198 static void free_discovery(struct discovery *d)
 199 {
 200         if (d) {
 201                 if (d == last_discovery)
 202                         last_discovery = NULL;
 203                 free(d->shallow.sha1);
 204                 free(d->buf_alloc);
 205                 free_refs(d->refs);
 206                 free(d);
 207         }
 208 }
 209
 210 static int show_http_message(struct strbuf *type, struct strbuf *charset,
 211                              struct strbuf *msg)
 212 {
 213         const char *p, *eol;
 214
 215         /*
 216          * We only show text/plain parts, as other types are likely
 217          * to be ugly to look at on the user's terminal.
 218          */
 219         if (strcmp(type->buf, "text/plain"))
 220                 return -1;
 221         if (charset->len)
 222                 strbuf_reencode(msg, charset->buf, get_log_output_encoding());
 223
 224         strbuf_trim(msg);
 225         if (!msg->len)
 226                 return -1;
 227
 228         p = msg->buf;
 229         do {
 230                 eol = strchrnul(p, '\n');
 231                 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 232                 p = eol + 1;
 233         } while(*eol);
 234         return 0;
 235 }
 236
 237 static struct discovery *discover_refs(const char *service, int for_push)
 238 {
 239         struct strbuf exp = STRBUF_INIT;
 240         struct strbuf type = STRBUF_INIT;
 241         struct strbuf charset = STRBUF_INIT;
 242         struct strbuf buffer = STRBUF_INIT;
 243         struct strbuf refs_url = STRBUF_INIT;
 244         struct strbuf effective_url = STRBUF_INIT;
 245         struct discovery *last = last_discovery;
 246         int http_ret, maybe_smart = 0;
 247         struct http_get_options options;
 248
 249         if (last && !strcmp(service, last->service))
 250                 return last;
 251         free_discovery(last);
 252
 253         strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 254         if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 255              git_env_bool("GIT_SMART_HTTP", 1)) {
 256                 maybe_smart = 1;
 257                 if (!strchr(url.buf, '?'))
 258                         strbuf_addch(&refs_url, '?');
 259                 else
 260                         strbuf_addch(&refs_url, '&');
 261                 strbuf_addf(&refs_url, "service=%s", service);
 262         }
 263
 264         memset(&options, 0, sizeof(options));
 265         options.content_type = &type;
 266         options.charset = &charset;
 267         options.effective_url = &effective_url;
 268         options.base_url = &url;
 269         options.no_cache = 1;
 270         options.keep_error = 1;
 271
 272         http_ret = http_get_strbuf(refs_url.buf, &buffer, &options);
 273         switch (http_ret) {
 274         case HTTP_OK:
 275                 break;
 276         case HTTP_MISSING_TARGET:
 277                 show_http_message(&type, &charset, &buffer);
 278                 die("repository '%s' not found", url.buf);
 279         case HTTP_NOAUTH:
 280                 show_http_message(&type, &charset, &buffer);
 281                 die("Authentication failed for '%s'", url.buf);
 282         default:
 283                 show_http_message(&type, &charset, &buffer);
 284                 die("unable to access '%s': %s", url.buf, curl_errorstr);
 285         }
 286
 287         last= xcalloc(1, sizeof(*last_discovery));
 288         last->service = service;
 289         last->buf_alloc = strbuf_detach(&buffer, &last->len);
 290         last->buf = last->buf_alloc;
 291
 292         strbuf_addf(&exp, "application/x-%s-advertisement", service);
 293         if (maybe_smart &&
 294             (5 <= last->len && last->buf[4] == '#') &&
 295             !strbuf_cmp(&exp, &type)) {
 296                 char *line;
 297
 298                 /*
 299                  * smart HTTP response; validate that the service
 300                  * pkt-line matches our request.
 301                  */
 302                 line = packet_read_line_buf(&last->buf, &last->len, NULL);
 303
 304                 strbuf_reset(&exp);
 305                 strbuf_addf(&exp, "# service=%s", service);
 306                 if (strcmp(line, exp.buf))
 307                         die("invalid server response; got '%s'", line);
 308                 strbuf_release(&exp);
 309
 310                 /* The header can include additional metadata lines, up
 311                  * until a packet flush marker.  Ignore these now, but
 312                  * in the future we might start to scan them.
 313                  */
 314                 while (packet_read_line_buf(&last->buf, &last->len, NULL))
 315                         ;
 316
 317                 last->proto_git = 1;
 318         }
 319
 320         if (last->proto_git)
 321                 last->refs = parse_git_refs(last, for_push);
 322         else
 323                 last->refs = parse_info_refs(last);
 324
 325         strbuf_release(&refs_url);
 326         strbuf_release(&exp);
 327         strbuf_release(&type);
 328         strbuf_release(&charset);
 329         strbuf_release(&effective_url);
 330         strbuf_release(&buffer);
 331         last_discovery = last;
 332         return last;
 333 }
 334
 335 static struct ref *get_refs(int for_push)
 336 {
 337         struct discovery *heads;
 338
 339         if (for_push)
 340                 heads = discover_refs("git-receive-pack", for_push);
 341         else
 342                 heads = discover_refs("git-upload-pack", for_push);
 343
 344         return heads->refs;
 345 }
 346
 347 static void output_refs(struct ref *refs)
 348 {
 349         struct ref *posn;
 350         for (posn = refs; posn; posn = posn->next) {
 351                 if (posn->symref)
 352                         printf("@%s %s\n", posn->symref, posn->name);
 353                 else
 354                         printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 355         }
 356         printf("\n");
 357         fflush(stdout);
 358 }
 359
 360 struct rpc_state {
 361         const char *service_name;
 362         const char **argv;
 363         struct strbuf *stdin_preamble;
 364         char *service_url;
 365         char *hdr_content_type;
 366         char *hdr_accept;
 367         char *buf;
 368         size_t alloc;
 369         size_t len;
 370         size_t pos;
 371         int in;
 372         int out;
 373         struct strbuf result;
 374         unsigned gzip_request : 1;
 375         unsigned initial_buffer : 1;
 376 };
 377
 378 static size_t rpc_out(void *ptr, size_t eltsize,
 379                 size_t nmemb, void *buffer_)
 380 {
 381         size_t max = eltsize * nmemb;
 382         struct rpc_state *rpc = buffer_;
 383         size_t avail = rpc->len - rpc->pos;
 384
 385         if (!avail) {
 386                 rpc->initial_buffer = 0;
 387                 avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 388                 if (!avail)
 389                         return 0;
 390                 rpc->pos = 0;
 391                 rpc->len = avail;
 392         }
 393
 394         if (max < avail)
 395                 avail = max;
 396         memcpy(ptr, rpc->buf + rpc->pos, avail);
 397         rpc->pos += avail;
 398         return avail;
 399 }
 400
 401 #ifndef NO_CURL_IOCTL
 402 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 403 {
 404         struct rpc_state *rpc = clientp;
 405
 406         switch (cmd) {
 407         case CURLIOCMD_NOP:
 408                 return CURLIOE_OK;
 409
 410         case CURLIOCMD_RESTARTREAD:
 411                 if (rpc->initial_buffer) {
 412                         rpc->pos = 0;
 413                         return CURLIOE_OK;
 414                 }
 415                 error("unable to rewind rpc post data - try increasing http.postBuffer");
 416                 return CURLIOE_FAILRESTART;
 417
 418         default:
 419                 return CURLIOE_UNKNOWNCMD;
 420         }
 421 }
 422 #endif
 423
 424 static size_t rpc_in(char *ptr, size_t eltsize,
 425                 size_t nmemb, void *buffer_)
 426 {
 427         size_t size = eltsize * nmemb;
 428         struct rpc_state *rpc = buffer_;
 429         write_or_die(rpc->in, ptr, size);
 430         return size;
 431 }
 432
 433 static int run_slot(struct active_request_slot *slot,
 434                     struct slot_results *results)
 435 {
 436         int err;
 437         struct slot_results results_buf;
 438
 439         if (!results)
 440                 results = &results_buf;
 441
 442         err = run_one_slot(slot, results);
 443
 444         if (err != HTTP_OK && err != HTTP_REAUTH) {
 445                 error("RPC failed; result=%d, HTTP code = %ld",
 446                       results->curl_result, results->http_code);
 447         }
 448
 449         return err;
 450 }
 451
 452 static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 453 {
 454         struct active_request_slot *slot;
 455         struct curl_slist *headers = NULL;
 456         struct strbuf buf = STRBUF_INIT;
 457         int err;
 458
 459         slot = get_active_slot();
 460
 461         headers = curl_slist_append(headers, rpc->hdr_content_type);
 462         headers = curl_slist_append(headers, rpc->hdr_accept);
 463
 464         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 465         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 466         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 467         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 468         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 469         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 470         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 471         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 472         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 473
 474         err = run_slot(slot, results);
 475
 476         curl_slist_free_all(headers);
 477         strbuf_release(&buf);
 478         return err;
 479 }
 480
 481 static int post_rpc(struct rpc_state *rpc)
 482 {
 483         struct active_request_slot *slot;
 484         struct curl_slist *headers = NULL;
 485         int use_gzip = rpc->gzip_request;
 486         char *gzip_body = NULL;
 487         size_t gzip_size = 0;
 488         int err, large_request = 0;
 489         int needs_100_continue = 0;
 490
 491         /* Try to load the entire request, if we can fit it into the
 492          * allocated buffer space we can use HTTP/1.0 and avoid the
 493          * chunked encoding mess.
 494          */
 495         while (1) {
 496                 size_t left = rpc->alloc - rpc->len;
 497                 char *buf = rpc->buf + rpc->len;
 498                 int n;
 499
 500                 if (left < LARGE_PACKET_MAX) {
 501                         large_request = 1;
 502                         use_gzip = 0;
 503                         break;
 504                 }
 505
 506                 n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 507                 if (!n)
 508                         break;
 509                 rpc->len += n;
 510         }
 511
 512         if (large_request) {
 513                 struct slot_results results;
 514
 515                 do {
 516                         err = probe_rpc(rpc, &results);
 517                         if (err == HTTP_REAUTH)
 518                                 credential_fill(&http_auth);
 519                 } while (err == HTTP_REAUTH);
 520                 if (err != HTTP_OK)
 521                         return -1;
 522
 523                 if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 524                         needs_100_continue = 1;
 525         }
 526
 527         headers = curl_slist_append(headers, rpc->hdr_content_type);
 528         headers = curl_slist_append(headers, rpc->hdr_accept);
 529         headers = curl_slist_append(headers, needs_100_continue ?
 530                 "Expect: 100-continue" : "Expect:");
 531
 532 retry:
 533         slot = get_active_slot();
 534
 535         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 536         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 537         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 538         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 539
 540         if (large_request) {
 541                 /* The request body is large and the size cannot be predicted.
 542                  * We must use chunked encoding to send it.
 543                  */
 544                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 545                 rpc->initial_buffer = 1;
 546                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 547                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 548 #ifndef NO_CURL_IOCTL
 549                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 550                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 551 #endif
 552                 if (options.verbosity > 1) {
 553                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 554                         fflush(stderr);
 555                 }
 556
 557         } else if (gzip_body) {
 558                 /*
 559                  * If we are looping to retry authentication, then the previous
 560                  * run will have set up the headers and gzip buffer already,
 561                  * and we just need to send it.
 562                  */
 563                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 564                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 565
 566         } else if (use_gzip && 1024 < rpc->len) {
 567                 /* The client backend isn't giving us compressed data so
 568                  * we can try to deflate it ourselves, this may save on.
 569                  * the transfer time.
 570                  */
 571                 git_zstream stream;
 572                 int ret;
 573
 574                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 575                 gzip_size = git_deflate_bound(&stream, rpc->len);
 576                 gzip_body = xmalloc(gzip_size);
 577
 578                 stream.next_in = (unsigned char *)rpc->buf;
 579                 stream.avail_in = rpc->len;
 580                 stream.next_out = (unsigned char *)gzip_body;
 581                 stream.avail_out = gzip_size;
 582
 583                 ret = git_deflate(&stream, Z_FINISH);
 584                 if (ret != Z_STREAM_END)
 585                         die("cannot deflate request; zlib deflate error %d", ret);
 586
 587                 ret = git_deflate_end_gently(&stream);
 588                 if (ret != Z_OK)
 589                         die("cannot deflate request; zlib end error %d", ret);
 590
 591                 gzip_size = stream.total_out;
 592
 593                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 594                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 595                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 596
 597                 if (options.verbosity > 1) {
 598                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 599                                 rpc->service_name,
 600                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
 601                         fflush(stderr);
 602                 }
 603         } else {
 604                 /* We know the complete request size in advance, use the
 605                  * more normal Content-Length approach.
 606                  */
 607                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 608                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 609                 if (options.verbosity > 1) {
 610                         fprintf(stderr, "POST %s (%lu bytes)\n",
 611                                 rpc->service_name, (unsigned long)rpc->len);
 612                         fflush(stderr);
 613                 }
 614         }
 615
 616         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 617         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 618         curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 619
 620         err = run_slot(slot, NULL);
 621         if (err == HTTP_REAUTH && !large_request) {
 622                 credential_fill(&http_auth);
 623                 goto retry;
 624         }
 625         if (err != HTTP_OK)
 626                 err = -1;
 627
 628         curl_slist_free_all(headers);
 629         free(gzip_body);
 630         return err;
 631 }
 632
 633 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 634 {
 635         const char *svc = rpc->service_name;
 636         struct strbuf buf = STRBUF_INIT;
 637         struct strbuf *preamble = rpc->stdin_preamble;
 638         struct child_process client = CHILD_PROCESS_INIT;
 639         int err = 0;
 640
 641         client.in = -1;
 642         client.out = -1;
 643         client.git_cmd = 1;
 644         client.argv = rpc->argv;
 645         if (start_command(&client))
 646                 exit(1);
 647         if (preamble)
 648                 write_or_die(client.in, preamble->buf, preamble->len);
 649         if (heads)
 650                 write_or_die(client.in, heads->buf, heads->len);
 651
 652         rpc->alloc = http_post_buffer;
 653         rpc->buf = xmalloc(rpc->alloc);
 654         rpc->in = client.in;
 655         rpc->out = client.out;
 656         strbuf_init(&rpc->result, 0);
 657
 658         strbuf_addf(&buf, "%s%s", url.buf, svc);
 659         rpc->service_url = strbuf_detach(&buf, NULL);
 660
 661         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 662         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 663
 664         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 665         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 666
 667         while (!err) {
 668                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 669                 if (!n)
 670                         break;
 671                 rpc->pos = 0;
 672                 rpc->len = n;
 673                 err |= post_rpc(rpc);
 674         }
 675
 676         close(client.in);
 677         client.in = -1;
 678         if (!err) {
 679                 strbuf_read(&rpc->result, client.out, 0);
 680         } else {
 681                 char buf[4096];
 682                 for (;;)
 683                         if (xread(client.out, buf, sizeof(buf)) <= 0)
 684                                 break;
 685         }
 686
 687         close(client.out);
 688         client.out = -1;
 689
 690         err |= finish_command(&client);
 691         free(rpc->service_url);
 692         free(rpc->hdr_content_type);
 693         free(rpc->hdr_accept);
 694         free(rpc->buf);
 695         strbuf_release(&buf);
 696         return err;
 697 }
 698
 699 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 700 {
 701         struct walker *walker;
 702         char **targets = xmalloc(nr_heads * sizeof(char*));
 703         int ret, i;
 704
 705         if (options.depth)
 706                 die("dumb http transport does not support --depth");
 707         for (i = 0; i < nr_heads; i++)
 708                 targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 709
 710         walker = get_http_walker(url.buf);
 711         walker->get_all = 1;
 712         walker->get_tree = 1;
 713         walker->get_history = 1;
 714         walker->get_verbosely = options.verbosity >= 3;
 715         walker->get_recover = 0;
 716         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 717         walker_free(walker);
 718
 719         for (i = 0; i < nr_heads; i++)
 720                 free(targets[i]);
 721         free(targets);
 722
 723         return ret ? error("fetch failed.") : 0;
 724 }
 725
 726 static int fetch_git(struct discovery *heads,
 727         int nr_heads, struct ref **to_fetch)
 728 {
 729         struct rpc_state rpc;
 730         struct strbuf preamble = STRBUF_INIT;
 731         char *depth_arg = NULL;
 732         int argc = 0, i, err;
 733         const char *argv[17];
 734
 735         argv[argc++] = "fetch-pack";
 736         argv[argc++] = "--stateless-rpc";
 737         argv[argc++] = "--stdin";
 738         argv[argc++] = "--lock-pack";
 739         if (options.followtags)
 740                 argv[argc++] = "--include-tag";
 741         if (options.thin)
 742                 argv[argc++] = "--thin";
 743         if (options.verbosity >= 3) {
 744                 argv[argc++] = "-v";
 745                 argv[argc++] = "-v";
 746         }
 747         if (options.check_self_contained_and_connected)
 748                 argv[argc++] = "--check-self-contained-and-connected";
 749         if (options.cloning)
 750                 argv[argc++] = "--cloning";
 751         if (options.update_shallow)
 752                 argv[argc++] = "--update-shallow";
 753         if (!options.progress)
 754                 argv[argc++] = "--no-progress";
 755         if (options.depth) {
 756                 struct strbuf buf = STRBUF_INIT;
 757                 strbuf_addf(&buf, "--depth=%lu", options.depth);
 758                 depth_arg = strbuf_detach(&buf, NULL);
 759                 argv[argc++] = depth_arg;
 760         }
 761         argv[argc++] = url.buf;
 762         argv[argc++] = NULL;
 763
 764         for (i = 0; i < nr_heads; i++) {
 765                 struct ref *ref = to_fetch[i];
 766                 if (!*ref->name)
 767                         die("cannot fetch by sha1 over smart http");
 768                 packet_buf_write(&preamble, "%s %s\n",
 769                                  sha1_to_hex(ref->old_sha1), ref->name);
 770         }
 771         packet_buf_flush(&preamble);
 772
 773         memset(&rpc, 0, sizeof(rpc));
 774         rpc.service_name = "git-upload-pack",
 775         rpc.argv = argv;
 776         rpc.stdin_preamble = &preamble;
 777         rpc.gzip_request = 1;
 778
 779         err = rpc_service(&rpc, heads);
 780         if (rpc.result.len)
 781                 write_or_die(1, rpc.result.buf, rpc.result.len);
 782         strbuf_release(&rpc.result);
 783         strbuf_release(&preamble);
 784         free(depth_arg);
 785         return err;
 786 }
 787
 788 static int fetch(int nr_heads, struct ref **to_fetch)
 789 {
 790         struct discovery *d = discover_refs("git-upload-pack", 0);
 791         if (d->proto_git)
 792                 return fetch_git(d, nr_heads, to_fetch);
 793         else
 794                 return fetch_dumb(nr_heads, to_fetch);
 795 }
 796
 797 static void parse_fetch(struct strbuf *buf)
 798 {
 799         struct ref **to_fetch = NULL;
 800         struct ref *list_head = NULL;
 801         struct ref **list = &list_head;
 802         int alloc_heads = 0, nr_heads = 0;
 803
 804         do {
 805                 const char *p;
 806                 if (skip_prefix(buf->buf, "fetch ", &p)) {
 807                         const char *name;
 808                         struct ref *ref;
 809                         unsigned char old_sha1[20];
 810
 811                         if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 812                                 die("protocol error: expected sha/ref, got %s'", p);
 813                         if (p[40] == ' ')
 814                                 name = p + 41;
 815                         else if (!p[40])
 816                                 name = "";
 817                         else
 818                                 die("protocol error: expected sha/ref, got %s'", p);
 819
 820                         ref = alloc_ref(name);
 821                         hashcpy(ref->old_sha1, old_sha1);
 822
 823                         *list = ref;
 824                         list = &ref->next;
 825
 826                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 827                         to_fetch[nr_heads++] = ref;
 828                 }
 829                 else
 830                         die("http transport does not support %s", buf->buf);
 831
 832                 strbuf_reset(buf);
 833                 if (strbuf_getline(buf, stdin, '\n') == EOF)
 834                         return;
 835                 if (!*buf->buf)
 836                         break;
 837         } while (1);
 838
 839         if (fetch(nr_heads, to_fetch))
 840                 exit(128); /* error already reported */
 841         free_refs(list_head);
 842         free(to_fetch);
 843
 844         printf("\n");
 845         fflush(stdout);
 846         strbuf_reset(buf);
 847 }
 848
 849 static int push_dav(int nr_spec, char **specs)
 850 {
 851         const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 852         int argc = 0, i;
 853
 854         argv[argc++] = "http-push";
 855         argv[argc++] = "--helper-status";
 856         if (options.dry_run)
 857                 argv[argc++] = "--dry-run";
 858         if (options.verbosity > 1)
 859                 argv[argc++] = "--verbose";
 860         argv[argc++] = url.buf;
 861         for (i = 0; i < nr_spec; i++)
 862                 argv[argc++] = specs[i];
 863         argv[argc++] = NULL;
 864
 865         if (run_command_v_opt(argv, RUN_GIT_CMD))
 866                 die("git-%s failed", argv[0]);
 867         free(argv);
 868         return 0;
 869 }
 870
 871 static int push_git(struct discovery *heads, int nr_spec, char **specs)
 872 {
 873         struct rpc_state rpc;
 874         int i, err;
 875         struct argv_array args;
 876         struct string_list_item *cas_option;
 877         struct strbuf preamble = STRBUF_INIT;
 878
 879         argv_array_init(&args);
 880         argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 881                          NULL);
 882
 883         if (options.thin)
 884                 argv_array_push(&args, "--thin");
 885         if (options.dry_run)
 886                 argv_array_push(&args, "--dry-run");
 887         if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
 888                 argv_array_push(&args, "--signed=yes");
 889         else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
 890                 argv_array_push(&args, "--signed=if-asked");
 891         if (options.verbosity == 0)
 892                 argv_array_push(&args, "--quiet");
 893         else if (options.verbosity > 1)
 894                 argv_array_push(&args, "--verbose");
 895         argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 896         for_each_string_list_item(cas_option, &cas_options)
 897                 argv_array_push(&args, cas_option->string);
 898         argv_array_push(&args, url.buf);
 899
 900         argv_array_push(&args, "--stdin");
 901         for (i = 0; i < nr_spec; i++)
 902                 packet_buf_write(&preamble, "%s\n", specs[i]);
 903         packet_buf_flush(&preamble);
 904
 905         memset(&rpc, 0, sizeof(rpc));
 906         rpc.service_name = "git-receive-pack",
 907         rpc.argv = args.argv;
 908         rpc.stdin_preamble = &preamble;
 909
 910         err = rpc_service(&rpc, heads);
 911         if (rpc.result.len)
 912                 write_or_die(1, rpc.result.buf, rpc.result.len);
 913         strbuf_release(&rpc.result);
 914         strbuf_release(&preamble);
 915         argv_array_clear(&args);
 916         return err;
 917 }
 918
 919 static int push(int nr_spec, char **specs)
 920 {
 921         struct discovery *heads = discover_refs("git-receive-pack", 1);
 922         int ret;
 923
 924         if (heads->proto_git)
 925                 ret = push_git(heads, nr_spec, specs);
 926         else
 927                 ret = push_dav(nr_spec, specs);
 928         free_discovery(heads);
 929         return ret;
 930 }
 931
 932 static void parse_push(struct strbuf *buf)
 933 {
 934         char **specs = NULL;
 935         int alloc_spec = 0, nr_spec = 0, i, ret;
 936
 937         do {
 938                 if (starts_with(buf->buf, "push ")) {
 939                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 940                         specs[nr_spec++] = xstrdup(buf->buf + 5);
 941                 }
 942                 else
 943                         die("http transport does not support %s", buf->buf);
 944
 945                 strbuf_reset(buf);
 946                 if (strbuf_getline(buf, stdin, '\n') == EOF)
 947                         goto free_specs;
 948                 if (!*buf->buf)
 949                         break;
 950         } while (1);
 951
 952         ret = push(nr_spec, specs);
 953         printf("\n");
 954         fflush(stdout);
 955
 956         if (ret)
 957                 exit(128); /* error already reported */
 958
 959  free_specs:
 960         for (i = 0; i < nr_spec; i++)
 961                 free(specs[i]);
 962         free(specs);
 963 }
 964
 965 int main(int argc, const char **argv)
 966 {
 967         struct strbuf buf = STRBUF_INIT;
 968         int nongit;
 969
 970         git_setup_gettext();
 971
 972         git_extract_argv0_path(argv[0]);
 973         setup_git_directory_gently(&nongit);
 974         if (argc < 2) {
 975                 error("remote-curl: usage: git remote-curl <remote> [<url>]");
 976                 return 1;
 977         }
 978
 979         options.verbosity = 1;
 980         options.progress = !!isatty(2);
 981         options.thin = 1;
 982
 983         remote = remote_get(argv[1]);
 984
 985         if (argc > 2) {
 986                 end_url_with_slash(&url, argv[2]);
 987         } else {
 988                 end_url_with_slash(&url, remote->url[0]);
 989         }
 990
 991         http_init(remote, url.buf, 0);
 992
 993         do {
 994                 const char *arg;
 995
 996                 if (strbuf_getline(&buf, stdin, '\n') == EOF) {
 997                         if (ferror(stdin))
 998                                 error("remote-curl: error reading command stream from git");
 999                         return 1;
1000                 }
1001                 if (buf.len == 0)
1002                         break;
1003                 if (starts_with(buf.buf, "fetch ")) {
1004                         if (nongit)
1005                                 die("remote-curl: fetch attempted without a local repo");
1006                         parse_fetch(&buf);
1007
1008                 } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1009                         int for_push = !!strstr(buf.buf + 4, "for-push");
1010                         output_refs(get_refs(for_push));
1011
1012                 } else if (starts_with(buf.buf, "push ")) {
1013                         parse_push(&buf);
1014
1015                 } else if (skip_prefix(buf.buf, "option ", &arg)) {
1016                         char *value = strchr(arg, ' ');
1017                         int result;
1018
1019                         if (value)
1020                                 *value++ = '\0';
1021                         else
1022                                 value = "true";
1023
1024                         result = set_option(arg, value);
1025                         if (!result)
1026                                 printf("ok\n");
1027                         else if (result < 0)
1028                                 printf("error invalid value\n");
1029                         else
1030                                 printf("unsupported\n");
1031                         fflush(stdout);
1032
1033                 } else if (!strcmp(buf.buf, "capabilities")) {
1034                         printf("fetch\n");
1035                         printf("option\n");
1036                         printf("push\n");
1037                         printf("check-connectivity\n");
1038                         printf("\n");
1039                         fflush(stdout);
1040                 } else {
1041                         error("remote-curl: unknown command '%s' from git", buf.buf);
1042                         return 1;
1043                 }
1044                 strbuf_reset(&buf);
1045         } while (1);
1046
1047         http_cleanup();
1048
1049         return 0;
1050 }