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 "sideband.h"
  10
  11 static struct remote *remote;
  12 static const char *url;
  13 static struct walker *walker;
  14
  15 struct options {
  16         int verbosity;
  17         unsigned long depth;
  18         unsigned progress : 1,
  19                 followtags : 1,
  20                 dry_run : 1,
  21                 thin : 1;
  22 };
  23 static struct options options;
  24
  25 static void init_walker(void)
  26 {
  27         if (!walker)
  28                 walker = get_http_walker(url, remote);
  29 }
  30
  31 static int set_option(const char *name, const char *value)
  32 {
  33         if (!strcmp(name, "verbosity")) {
  34                 char *end;
  35                 int v = strtol(value, &end, 10);
  36                 if (value == end || *end)
  37                         return -1;
  38                 options.verbosity = v;
  39                 return 0;
  40         }
  41         else if (!strcmp(name, "progress")) {
  42                 if (!strcmp(value, "true"))
  43                         options.progress = 1;
  44                 else if (!strcmp(value, "false"))
  45                         options.progress = 0;
  46                 else
  47                         return -1;
  48                 return 0;
  49         }
  50         else if (!strcmp(name, "depth")) {
  51                 char *end;
  52                 unsigned long v = strtoul(value, &end, 10);
  53                 if (value == end || *end)
  54                         return -1;
  55                 options.depth = v;
  56                 return 0;
  57         }
  58         else if (!strcmp(name, "followtags")) {
  59                 if (!strcmp(value, "true"))
  60                         options.followtags = 1;
  61                 else if (!strcmp(value, "false"))
  62                         options.followtags = 0;
  63                 else
  64                         return -1;
  65                 return 0;
  66         }
  67         else if (!strcmp(name, "dry-run")) {
  68                 if (!strcmp(value, "true"))
  69                         options.dry_run = 1;
  70                 else if (!strcmp(value, "false"))
  71                         options.dry_run = 0;
  72                 else
  73                         return -1;
  74                 return 0;
  75         }
  76         else {
  77                 return 1 /* unsupported */;
  78         }
  79 }
  80
  81 struct discovery {
  82         const char *service;
  83         char *buf_alloc;
  84         char *buf;
  85         size_t len;
  86         unsigned proto_git : 1;
  87 };
  88 static struct discovery *last_discovery;
  89
  90 static void free_discovery(struct discovery *d)
  91 {
  92         if (d) {
  93                 if (d == last_discovery)
  94                         last_discovery = NULL;
  95                 free(d->buf_alloc);
  96                 free(d);
  97         }
  98 }
  99
 100 static struct discovery* discover_refs(const char *service)
 101 {
 102         struct strbuf buffer = STRBUF_INIT;
 103         struct discovery *last = last_discovery;
 104         char *refs_url;
 105         int http_ret, is_http = 0;
 106
 107         if (last && !strcmp(service, last->service))
 108                 return last;
 109         free_discovery(last);
 110
 111         strbuf_addf(&buffer, "%s/info/refs", url);
 112         if (!prefixcmp(url, "http://") || !prefixcmp(url, "https://")) {
 113                 is_http = 1;
 114                 if (!strchr(url, '?'))
 115                         strbuf_addch(&buffer, '?');
 116                 else
 117                         strbuf_addch(&buffer, '&');
 118                 strbuf_addf(&buffer, "service=%s", service);
 119         }
 120         refs_url = strbuf_detach(&buffer, NULL);
 121
 122         init_walker();
 123         http_ret = http_get_strbuf(refs_url, &buffer, HTTP_NO_CACHE);
 124         switch (http_ret) {
 125         case HTTP_OK:
 126                 break;
 127         case HTTP_MISSING_TARGET:
 128                 die("%s not found: did you run git update-server-info on the"
 129                     " server?", refs_url);
 130         default:
 131                 http_error(refs_url, http_ret);
 132                 die("HTTP request failed");
 133         }
 134
 135         last= xcalloc(1, sizeof(*last_discovery));
 136         last->service = service;
 137         last->buf_alloc = strbuf_detach(&buffer, &last->len);
 138         last->buf = last->buf_alloc;
 139
 140         if (is_http && 5 <= last->len && last->buf[4] == '#') {
 141                 /* smart HTTP response; validate that the service
 142                  * pkt-line matches our request.
 143                  */
 144                 struct strbuf exp = STRBUF_INIT;
 145
 146                 if (packet_get_line(&buffer, &last->buf, &last->len) <= 0)
 147                         die("%s has invalid packet header", refs_url);
 148                 if (buffer.len && buffer.buf[buffer.len - 1] == '\n')
 149                         strbuf_setlen(&buffer, buffer.len - 1);
 150
 151                 strbuf_addf(&exp, "# service=%s", service);
 152                 if (strbuf_cmp(&exp, &buffer))
 153                         die("invalid server response; got '%s'", buffer.buf);
 154                 strbuf_release(&exp);
 155
 156                 /* The header can include additional metadata lines, up
 157                  * until a packet flush marker.  Ignore these now, but
 158                  * in the future we might start to scan them.
 159                  */
 160                 strbuf_reset(&buffer);
 161                 while (packet_get_line(&buffer, &last->buf, &last->len) > 0)
 162                         strbuf_reset(&buffer);
 163
 164                 last->proto_git = 1;
 165         }
 166
 167         free(refs_url);
 168         strbuf_release(&buffer);
 169         last_discovery = last;
 170         return last;
 171 }
 172
 173 static int write_discovery(int fd, void *data)
 174 {
 175         struct discovery *heads = data;
 176         int err = 0;
 177         if (write_in_full(fd, heads->buf, heads->len) != heads->len)
 178                 err = 1;
 179         close(fd);
 180         return err;
 181 }
 182
 183 static struct ref *parse_git_refs(struct discovery *heads)
 184 {
 185         struct ref *list = NULL;
 186         struct async async;
 187
 188         memset(&async, 0, sizeof(async));
 189         async.proc = write_discovery;
 190         async.data = heads;
 191
 192         if (start_async(&async))
 193                 die("cannot start thread to parse advertised refs");
 194         get_remote_heads(async.out, &list, 0, NULL, 0, NULL);
 195         close(async.out);
 196         if (finish_async(&async))
 197                 die("ref parsing thread failed");
 198         return list;
 199 }
 200
 201 static struct ref *parse_info_refs(struct discovery *heads)
 202 {
 203         char *data, *start, *mid;
 204         char *ref_name;
 205         int i = 0;
 206
 207         struct ref *refs = NULL;
 208         struct ref *ref = NULL;
 209         struct ref *last_ref = NULL;
 210
 211         data = heads->buf;
 212         start = NULL;
 213         mid = data;
 214         while (i < heads->len) {
 215                 if (!start) {
 216                         start = &data[i];
 217                 }
 218                 if (data[i] == '\t')
 219                         mid = &data[i];
 220                 if (data[i] == '\n') {
 221                         data[i] = 0;
 222                         ref_name = mid + 1;
 223                         ref = xmalloc(sizeof(struct ref) +
 224                                       strlen(ref_name) + 1);
 225                         memset(ref, 0, sizeof(struct ref));
 226                         strcpy(ref->name, ref_name);
 227                         get_sha1_hex(start, ref->old_sha1);
 228                         if (!refs)
 229                                 refs = ref;
 230                         if (last_ref)
 231                                 last_ref->next = ref;
 232                         last_ref = ref;
 233                         start = NULL;
 234                 }
 235                 i++;
 236         }
 237
 238         init_walker();
 239         ref = alloc_ref("HEAD");
 240         if (!walker->fetch_ref(walker, ref) &&
 241             !resolve_remote_symref(ref, refs)) {
 242                 ref->next = refs;
 243                 refs = ref;
 244         } else {
 245                 free(ref);
 246         }
 247
 248         return refs;
 249 }
 250
 251 static struct ref *get_refs(int for_push)
 252 {
 253         struct discovery *heads;
 254
 255         if (for_push)
 256                 heads = discover_refs("git-receive-pack");
 257         else
 258                 heads = discover_refs("git-upload-pack");
 259
 260         if (heads->proto_git)
 261                 return parse_git_refs(heads);
 262         return parse_info_refs(heads);
 263 }
 264
 265 static void output_refs(struct ref *refs)
 266 {
 267         struct ref *posn;
 268         for (posn = refs; posn; posn = posn->next) {
 269                 if (posn->symref)
 270                         printf("@%s %s\n", posn->symref, posn->name);
 271                 else
 272                         printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 273         }
 274         printf("\n");
 275         fflush(stdout);
 276         free_refs(refs);
 277 }
 278
 279 struct rpc_state {
 280         const char *service_name;
 281         const char **argv;
 282         char *service_url;
 283         char *hdr_content_type;
 284         char *hdr_accept;
 285         char *buf;
 286         size_t alloc;
 287         size_t len;
 288         size_t pos;
 289         int in;
 290         int out;
 291         struct strbuf result;
 292         unsigned gzip_request : 1;
 293         unsigned initial_buffer : 1;
 294 };
 295
 296 static size_t rpc_out(void *ptr, size_t eltsize,
 297                 size_t nmemb, void *buffer_)
 298 {
 299         size_t max = eltsize * nmemb;
 300         struct rpc_state *rpc = buffer_;
 301         size_t avail = rpc->len - rpc->pos;
 302
 303         if (!avail) {
 304                 rpc->initial_buffer = 0;
 305                 avail = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
 306                 if (!avail)
 307                         return 0;
 308                 rpc->pos = 0;
 309                 rpc->len = avail;
 310         }
 311
 312         if (max < avail)
 313                 avail = max;
 314         memcpy(ptr, rpc->buf + rpc->pos, avail);
 315         rpc->pos += avail;
 316         return avail;
 317 }
 318
 319 #ifndef NO_CURL_IOCTL
 320 curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 321 {
 322         struct rpc_state *rpc = clientp;
 323
 324         switch (cmd) {
 325         case CURLIOCMD_NOP:
 326                 return CURLIOE_OK;
 327
 328         case CURLIOCMD_RESTARTREAD:
 329                 if (rpc->initial_buffer) {
 330                         rpc->pos = 0;
 331                         return CURLIOE_OK;
 332                 }
 333                 fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
 334                 return CURLIOE_FAILRESTART;
 335
 336         default:
 337                 return CURLIOE_UNKNOWNCMD;
 338         }
 339 }
 340 #endif
 341
 342 static size_t rpc_in(const void *ptr, size_t eltsize,
 343                 size_t nmemb, void *buffer_)
 344 {
 345         size_t size = eltsize * nmemb;
 346         struct rpc_state *rpc = buffer_;
 347         write_or_die(rpc->in, ptr, size);
 348         return size;
 349 }
 350
 351 static int post_rpc(struct rpc_state *rpc)
 352 {
 353         struct active_request_slot *slot;
 354         struct slot_results results;
 355         struct curl_slist *headers = NULL;
 356         int use_gzip = rpc->gzip_request;
 357         char *gzip_body = NULL;
 358         int err = 0, large_request = 0;
 359
 360         /* Try to load the entire request, if we can fit it into the
 361          * allocated buffer space we can use HTTP/1.0 and avoid the
 362          * chunked encoding mess.
 363          */
 364         while (1) {
 365                 size_t left = rpc->alloc - rpc->len;
 366                 char *buf = rpc->buf + rpc->len;
 367                 int n;
 368
 369                 if (left < LARGE_PACKET_MAX) {
 370                         large_request = 1;
 371                         use_gzip = 0;
 372                         break;
 373                 }
 374
 375                 n = packet_read_line(rpc->out, buf, left);
 376                 if (!n)
 377                         break;
 378                 rpc->len += n;
 379         }
 380
 381         slot = get_active_slot();
 382         slot->results = &results;
 383
 384         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 385         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 386         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 387         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 388
 389         headers = curl_slist_append(headers, rpc->hdr_content_type);
 390         headers = curl_slist_append(headers, rpc->hdr_accept);
 391
 392         if (large_request) {
 393                 /* The request body is large and the size cannot be predicted.
 394                  * We must use chunked encoding to send it.
 395                  */
 396                 headers = curl_slist_append(headers, "Expect: 100-continue");
 397                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 398                 rpc->initial_buffer = 1;
 399                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 400                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 401 #ifndef NO_CURL_IOCTL
 402                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 403                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 404 #endif
 405                 if (options.verbosity > 1) {
 406                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 407                         fflush(stderr);
 408                 }
 409
 410         } else if (use_gzip && 1024 < rpc->len) {
 411                 /* The client backend isn't giving us compressed data so
 412                  * we can try to deflate it ourselves, this may save on.
 413                  * the transfer time.
 414                  */
 415                 size_t size;
 416                 z_stream stream;
 417                 int ret;
 418
 419                 memset(&stream, 0, sizeof(stream));
 420                 ret = deflateInit2(&stream, Z_BEST_COMPRESSION,
 421                                 Z_DEFLATED, (15 + 16),
 422                                 8, Z_DEFAULT_STRATEGY);
 423                 if (ret != Z_OK)
 424                         die("cannot deflate request; zlib init error %d", ret);
 425                 size = deflateBound(&stream, rpc->len);
 426                 gzip_body = xmalloc(size);
 427
 428                 stream.next_in = (unsigned char *)rpc->buf;
 429                 stream.avail_in = rpc->len;
 430                 stream.next_out = (unsigned char *)gzip_body;
 431                 stream.avail_out = size;
 432
 433                 ret = deflate(&stream, Z_FINISH);
 434                 if (ret != Z_STREAM_END)
 435                         die("cannot deflate request; zlib deflate error %d", ret);
 436
 437                 ret = deflateEnd(&stream);
 438                 if (ret != Z_OK)
 439                         die("cannot deflate request; zlib end error %d", ret);
 440
 441                 size = stream.total_out;
 442
 443                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 444                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 445                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, size);
 446
 447                 if (options.verbosity > 1) {
 448                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 449                                 rpc->service_name,
 450                                 (unsigned long)rpc->len, (unsigned long)size);
 451                         fflush(stderr);
 452                 }
 453         } else {
 454                 /* We know the complete request size in advance, use the
 455                  * more normal Content-Length approach.
 456                  */
 457                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 458                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 459                 if (options.verbosity > 1) {
 460                         fprintf(stderr, "POST %s (%lu bytes)\n",
 461                                 rpc->service_name, (unsigned long)rpc->len);
 462                         fflush(stderr);
 463                 }
 464         }
 465
 466         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 467         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 468         curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 469
 470         slot->curl_result = curl_easy_perform(slot->curl);
 471         finish_active_slot(slot);
 472
 473         if (results.curl_result != CURLE_OK) {
 474                 err |= error("RPC failed; result=%d, HTTP code = %ld",
 475                         results.curl_result, results.http_code);
 476         }
 477
 478         curl_slist_free_all(headers);
 479         free(gzip_body);
 480         return err;
 481 }
 482
 483 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 484 {
 485         const char *svc = rpc->service_name;
 486         struct strbuf buf = STRBUF_INIT;
 487         struct child_process client;
 488         int err = 0;
 489
 490         init_walker();
 491         memset(&client, 0, sizeof(client));
 492         client.in = -1;
 493         client.out = -1;
 494         client.git_cmd = 1;
 495         client.argv = rpc->argv;
 496         if (start_command(&client))
 497                 exit(1);
 498         if (heads)
 499                 write_or_die(client.in, heads->buf, heads->len);
 500
 501         rpc->alloc = http_post_buffer;
 502         rpc->buf = xmalloc(rpc->alloc);
 503         rpc->in = client.in;
 504         rpc->out = client.out;
 505         strbuf_init(&rpc->result, 0);
 506
 507         strbuf_addf(&buf, "%s/%s", url, svc);
 508         rpc->service_url = strbuf_detach(&buf, NULL);
 509
 510         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 511         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 512
 513         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 514         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 515
 516         while (!err) {
 517                 int n = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
 518                 if (!n)
 519                         break;
 520                 rpc->pos = 0;
 521                 rpc->len = n;
 522                 err |= post_rpc(rpc);
 523         }
 524         strbuf_read(&rpc->result, client.out, 0);
 525
 526         close(client.in);
 527         close(client.out);
 528         client.in = -1;
 529         client.out = -1;
 530
 531         err |= finish_command(&client);
 532         free(rpc->service_url);
 533         free(rpc->hdr_content_type);
 534         free(rpc->hdr_accept);
 535         free(rpc->buf);
 536         strbuf_release(&buf);
 537         return err;
 538 }
 539
 540 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 541 {
 542         char **targets = xmalloc(nr_heads * sizeof(char*));
 543         int ret, i;
 544
 545         if (options.depth)
 546                 die("dumb http transport does not support --depth");
 547         for (i = 0; i < nr_heads; i++)
 548                 targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 549
 550         init_walker();
 551         walker->get_all = 1;
 552         walker->get_tree = 1;
 553         walker->get_history = 1;
 554         walker->get_verbosely = options.verbosity >= 3;
 555         walker->get_recover = 0;
 556         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 557
 558         for (i = 0; i < nr_heads; i++)
 559                 free(targets[i]);
 560         free(targets);
 561
 562         return ret ? error("Fetch failed.") : 0;
 563 }
 564
 565 static int fetch_git(struct discovery *heads,
 566         int nr_heads, struct ref **to_fetch)
 567 {
 568         struct rpc_state rpc;
 569         char *depth_arg = NULL;
 570         const char **argv;
 571         int argc = 0, i, err;
 572
 573         argv = xmalloc((15 + nr_heads) * sizeof(char*));
 574         argv[argc++] = "fetch-pack";
 575         argv[argc++] = "--stateless-rpc";
 576         argv[argc++] = "--lock-pack";
 577         if (options.followtags)
 578                 argv[argc++] = "--include-tag";
 579         if (options.thin)
 580                 argv[argc++] = "--thin";
 581         if (options.verbosity >= 3) {
 582                 argv[argc++] = "-v";
 583                 argv[argc++] = "-v";
 584         }
 585         if (!options.progress)
 586                 argv[argc++] = "--no-progress";
 587         if (options.depth) {
 588                 struct strbuf buf = STRBUF_INIT;
 589                 strbuf_addf(&buf, "--depth=%lu", options.depth);
 590                 depth_arg = strbuf_detach(&buf, NULL);
 591                 argv[argc++] = depth_arg;
 592         }
 593         argv[argc++] = url;
 594         for (i = 0; i < nr_heads; i++) {
 595                 struct ref *ref = to_fetch[i];
 596                 if (!ref->name || !*ref->name)
 597                         die("cannot fetch by sha1 over smart http");
 598                 argv[argc++] = ref->name;
 599         }
 600         argv[argc++] = NULL;
 601
 602         memset(&rpc, 0, sizeof(rpc));
 603         rpc.service_name = "git-upload-pack",
 604         rpc.argv = argv;
 605         rpc.gzip_request = 1;
 606
 607         err = rpc_service(&rpc, heads);
 608         if (rpc.result.len)
 609                 safe_write(1, rpc.result.buf, rpc.result.len);
 610         strbuf_release(&rpc.result);
 611         free(argv);
 612         free(depth_arg);
 613         return err;
 614 }
 615
 616 static int fetch(int nr_heads, struct ref **to_fetch)
 617 {
 618         struct discovery *d = discover_refs("git-upload-pack");
 619         if (d->proto_git)
 620                 return fetch_git(d, nr_heads, to_fetch);
 621         else
 622                 return fetch_dumb(nr_heads, to_fetch);
 623 }
 624
 625 static void parse_fetch(struct strbuf *buf)
 626 {
 627         struct ref **to_fetch = NULL;
 628         struct ref *list_head = NULL;
 629         struct ref **list = &list_head;
 630         int alloc_heads = 0, nr_heads = 0;
 631
 632         do {
 633                 if (!prefixcmp(buf->buf, "fetch ")) {
 634                         char *p = buf->buf + strlen("fetch ");
 635                         char *name;
 636                         struct ref *ref;
 637                         unsigned char old_sha1[20];
 638
 639                         if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 640                                 die("protocol error: expected sha/ref, got %s'", p);
 641                         if (p[40] == ' ')
 642                                 name = p + 41;
 643                         else if (!p[40])
 644                                 name = "";
 645                         else
 646                                 die("protocol error: expected sha/ref, got %s'", p);
 647
 648                         ref = alloc_ref(name);
 649                         hashcpy(ref->old_sha1, old_sha1);
 650
 651                         *list = ref;
 652                         list = &ref->next;
 653
 654                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 655                         to_fetch[nr_heads++] = ref;
 656                 }
 657                 else
 658                         die("http transport does not support %s", buf->buf);
 659
 660                 strbuf_reset(buf);
 661                 if (strbuf_getline(buf, stdin, '\n') == EOF)
 662                         return;
 663                 if (!*buf->buf)
 664                         break;
 665         } while (1);
 666
 667         if (fetch(nr_heads, to_fetch))
 668                 exit(128); /* error already reported */
 669         free_refs(list_head);
 670         free(to_fetch);
 671
 672         printf("\n");
 673         fflush(stdout);
 674         strbuf_reset(buf);
 675 }
 676
 677 static int push_dav(int nr_spec, char **specs)
 678 {
 679         const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 680         int argc = 0, i;
 681
 682         argv[argc++] = "http-push";
 683         argv[argc++] = "--helper-status";
 684         if (options.dry_run)
 685                 argv[argc++] = "--dry-run";
 686         if (options.verbosity > 1)
 687                 argv[argc++] = "--verbose";
 688         argv[argc++] = url;
 689         for (i = 0; i < nr_spec; i++)
 690                 argv[argc++] = specs[i];
 691         argv[argc++] = NULL;
 692
 693         if (run_command_v_opt(argv, RUN_GIT_CMD))
 694                 die("git-%s failed", argv[0]);
 695         free(argv);
 696         return 0;
 697 }
 698
 699 static int push_git(struct discovery *heads, int nr_spec, char **specs)
 700 {
 701         struct rpc_state rpc;
 702         const char **argv;
 703         int argc = 0, i, err;
 704
 705         argv = xmalloc((10 + nr_spec) * sizeof(char*));
 706         argv[argc++] = "send-pack";
 707         argv[argc++] = "--stateless-rpc";
 708         argv[argc++] = "--helper-status";
 709         if (options.thin)
 710                 argv[argc++] = "--thin";
 711         if (options.dry_run)
 712                 argv[argc++] = "--dry-run";
 713         if (options.verbosity > 1)
 714                 argv[argc++] = "--verbose";
 715         argv[argc++] = url;
 716         for (i = 0; i < nr_spec; i++)
 717                 argv[argc++] = specs[i];
 718         argv[argc++] = NULL;
 719
 720         memset(&rpc, 0, sizeof(rpc));
 721         rpc.service_name = "git-receive-pack",
 722         rpc.argv = argv;
 723
 724         err = rpc_service(&rpc, heads);
 725         if (rpc.result.len)
 726                 safe_write(1, rpc.result.buf, rpc.result.len);
 727         strbuf_release(&rpc.result);
 728         free(argv);
 729         return err;
 730 }
 731
 732 static int push(int nr_spec, char **specs)
 733 {
 734         struct discovery *heads = discover_refs("git-receive-pack");
 735         int ret;
 736
 737         if (heads->proto_git)
 738                 ret = push_git(heads, nr_spec, specs);
 739         else
 740                 ret = push_dav(nr_spec, specs);
 741         free_discovery(heads);
 742         return ret;
 743 }
 744
 745 static void parse_push(struct strbuf *buf)
 746 {
 747         char **specs = NULL;
 748         int alloc_spec = 0, nr_spec = 0, i;
 749
 750         do {
 751                 if (!prefixcmp(buf->buf, "push ")) {
 752                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 753                         specs[nr_spec++] = xstrdup(buf->buf + 5);
 754                 }
 755                 else
 756                         die("http transport does not support %s", buf->buf);
 757
 758                 strbuf_reset(buf);
 759                 if (strbuf_getline(buf, stdin, '\n') == EOF)
 760                         return;
 761                 if (!*buf->buf)
 762                         break;
 763         } while (1);
 764
 765         if (push(nr_spec, specs))
 766                 exit(128); /* error already reported */
 767         for (i = 0; i < nr_spec; i++)
 768                 free(specs[i]);
 769         free(specs);
 770
 771         printf("\n");
 772         fflush(stdout);
 773 }
 774
 775 int main(int argc, const char **argv)
 776 {
 777         struct strbuf buf = STRBUF_INIT;
 778         int nongit;
 779
 780         git_extract_argv0_path(argv[0]);
 781         setup_git_directory_gently(&nongit);
 782         if (argc < 2) {
 783                 fprintf(stderr, "Remote needed\n");
 784                 return 1;
 785         }
 786
 787         options.verbosity = 1;
 788         options.progress = !!isatty(2);
 789         options.thin = 1;
 790
 791         remote = remote_get(argv[1]);
 792
 793         if (argc > 2) {
 794                 url = argv[2];
 795         } else {
 796                 url = remote->url[0];
 797         }
 798
 799         do {
 800                 if (strbuf_getline(&buf, stdin, '\n') == EOF)
 801                         break;
 802                 if (!prefixcmp(buf.buf, "fetch ")) {
 803                         if (nongit)
 804                                 die("Fetch attempted without a local repo");
 805                         parse_fetch(&buf);
 806
 807                 } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
 808                         int for_push = !!strstr(buf.buf + 4, "for-push");
 809                         output_refs(get_refs(for_push));
 810
 811                 } else if (!prefixcmp(buf.buf, "push ")) {
 812                         parse_push(&buf);
 813
 814                 } else if (!prefixcmp(buf.buf, "option ")) {
 815                         char *name = buf.buf + strlen("option ");
 816                         char *value = strchr(name, ' ');
 817                         int result;
 818
 819                         if (value)
 820                                 *value++ = '\0';
 821                         else
 822                                 value = "true";
 823
 824                         result = set_option(name, value);
 825                         if (!result)
 826                                 printf("ok\n");
 827                         else if (result < 0)
 828                                 printf("error invalid value\n");
 829                         else
 830                                 printf("unsupported\n");
 831                         fflush(stdout);
 832
 833                 } else if (!strcmp(buf.buf, "capabilities")) {
 834                         printf("fetch\n");
 835                         printf("option\n");
 836                         printf("push\n");
 837                         printf("\n");
 838                         fflush(stdout);
 839                 } else {
 840                         return 1;
 841                 }
 842                 strbuf_reset(&buf);
 843         } while (1);
 844         return 0;
 845 }