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