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; /* always ends with a trailing slash */
  13
  14 struct options {
  15         int verbosity;
  16         unsigned long depth;
  17         unsigned progress : 1,
  18                 followtags : 1,
  19                 dry_run : 1,
  20                 thin : 1;
  21 };
  22 static struct options options;
  23
  24 static int set_option(const char *name, const char *value)
  25 {
  26         if (!strcmp(name, "verbosity")) {
  27                 char *end;
  28                 int v = strtol(value, &end, 10);
  29                 if (value == end || *end)
  30                         return -1;
  31                 options.verbosity = v;
  32                 return 0;
  33         }
  34         else if (!strcmp(name, "progress")) {
  35                 if (!strcmp(value, "true"))
  36                         options.progress = 1;
  37                 else if (!strcmp(value, "false"))
  38                         options.progress = 0;
  39                 else
  40                         return -1;
  41                 return 0;
  42         }
  43         else if (!strcmp(name, "depth")) {
  44                 char *end;
  45                 unsigned long v = strtoul(value, &end, 10);
  46                 if (value == end || *end)
  47                         return -1;
  48                 options.depth = v;
  49                 return 0;
  50         }
  51         else if (!strcmp(name, "followtags")) {
  52                 if (!strcmp(value, "true"))
  53                         options.followtags = 1;
  54                 else if (!strcmp(value, "false"))
  55                         options.followtags = 0;
  56                 else
  57                         return -1;
  58                 return 0;
  59         }
  60         else if (!strcmp(name, "dry-run")) {
  61                 if (!strcmp(value, "true"))
  62                         options.dry_run = 1;
  63                 else if (!strcmp(value, "false"))
  64                         options.dry_run = 0;
  65                 else
  66                         return -1;
  67                 return 0;
  68         }
  69         else {
  70                 return 1 /* unsupported */;
  71         }
  72 }
  73
  74 struct discovery {
  75         const char *service;
  76         char *buf_alloc;
  77         char *buf;
  78         size_t len;
  79         unsigned proto_git : 1;
  80 };
  81 static struct discovery *last_discovery;
  82
  83 static void free_discovery(struct discovery *d)
  84 {
  85         if (d) {
  86                 if (d == last_discovery)
  87                         last_discovery = NULL;
  88                 free(d->buf_alloc);
  89                 free(d);
  90         }
  91 }
  92
  93 static struct discovery* discover_refs(const char *service)
  94 {
  95         struct strbuf exp = STRBUF_INIT;
  96         struct strbuf type = STRBUF_INIT;
  97         struct strbuf buffer = STRBUF_INIT;
  98         struct discovery *last = last_discovery;
  99         char *refs_url;
 100         int http_ret, maybe_smart = 0;
 101
 102         if (last && !strcmp(service, last->service))
 103                 return last;
 104         free_discovery(last);
 105
 106         strbuf_addf(&buffer, "%sinfo/refs", url);
 107         if ((!prefixcmp(url, "http://") || !prefixcmp(url, "https://")) &&
 108              git_env_bool("GIT_SMART_HTTP", 1)) {
 109                 maybe_smart = 1;
 110                 if (!strchr(url, '?'))
 111                         strbuf_addch(&buffer, '?');
 112                 else
 113                         strbuf_addch(&buffer, '&');
 114                 strbuf_addf(&buffer, "service=%s", service);
 115         }
 116         refs_url = strbuf_detach(&buffer, NULL);
 117
 118         http_ret = http_get_strbuf(refs_url, &type, &buffer, HTTP_NO_CACHE);
 119         switch (http_ret) {
 120         case HTTP_OK:
 121                 break;
 122         case HTTP_MISSING_TARGET:
 123                 die("%s not found: did you run git update-server-info on the"
 124                     " server?", refs_url);
 125         case HTTP_NOAUTH:
 126                 die("Authentication failed");
 127         default:
 128                 http_error(refs_url, http_ret);
 129                 die("HTTP request failed");
 130         }
 131
 132         last= xcalloc(1, sizeof(*last_discovery));
 133         last->service = service;
 134         last->buf_alloc = strbuf_detach(&buffer, &last->len);
 135         last->buf = last->buf_alloc;
 136
 137         strbuf_addf(&exp, "application/x-%s-advertisement", service);
 138         if (maybe_smart &&
 139             (5 <= last->len && last->buf[4] == '#') &&
 140             !strbuf_cmp(&exp, &type)) {
 141                 /*
 142                  * smart HTTP response; validate that the service
 143                  * pkt-line matches our request.
 144                  */
 145                 if (packet_get_line(&buffer, &last->buf, &last->len) <= 0)
 146                         die("%s has invalid packet header", refs_url);
 147                 if (buffer.len && buffer.buf[buffer.len - 1] == '\n')
 148                         strbuf_setlen(&buffer, buffer.len - 1);
 149
 150                 strbuf_reset(&exp);
 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(&exp);
 169         strbuf_release(&type);
 170         strbuf_release(&buffer);
 171         last_discovery = last;
 172         return last;
 173 }
 174
 175 static int write_discovery(int in, int out, void *data)
 176 {
 177         struct discovery *heads = data;
 178         int err = 0;
 179         if (write_in_full(out, heads->buf, heads->len) != heads->len)
 180                 err = 1;
 181         close(out);
 182         return err;
 183 }
 184
 185 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 186 {
 187         struct ref *list = NULL;
 188         struct async async;
 189
 190         memset(&async, 0, sizeof(async));
 191         async.proc = write_discovery;
 192         async.data = heads;
 193         async.out = -1;
 194
 195         if (start_async(&async))
 196                 die("cannot start thread to parse advertised refs");
 197         get_remote_heads(async.out, &list,
 198                         for_push ? REF_NORMAL : 0, NULL);
 199         close(async.out);
 200         if (finish_async(&async))
 201                 die("ref parsing thread failed");
 202         return list;
 203 }
 204
 205 static struct ref *parse_info_refs(struct discovery *heads)
 206 {
 207         char *data, *start, *mid;
 208         char *ref_name;
 209         int i = 0;
 210
 211         struct ref *refs = NULL;
 212         struct ref *ref = NULL;
 213         struct ref *last_ref = NULL;
 214
 215         data = heads->buf;
 216         start = NULL;
 217         mid = data;
 218         while (i < heads->len) {
 219                 if (!start) {
 220                         start = &data[i];
 221                 }
 222                 if (data[i] == '\t')
 223                         mid = &data[i];
 224                 if (data[i] == '\n') {
 225                         if (mid - start != 40)
 226                                 die("%sinfo/refs not valid: is this a git repository?", url);
 227                         data[i] = 0;
 228                         ref_name = mid + 1;
 229                         ref = xmalloc(sizeof(struct ref) +
 230                                       strlen(ref_name) + 1);
 231                         memset(ref, 0, sizeof(struct ref));
 232                         strcpy(ref->name, ref_name);
 233                         get_sha1_hex(start, ref->old_sha1);
 234                         if (!refs)
 235                                 refs = ref;
 236                         if (last_ref)
 237                                 last_ref->next = ref;
 238                         last_ref = ref;
 239                         start = NULL;
 240                 }
 241                 i++;
 242         }
 243
 244         ref = alloc_ref("HEAD");
 245         if (!http_fetch_ref(url, ref) &&
 246             !resolve_remote_symref(ref, refs)) {
 247                 ref->next = refs;
 248                 refs = ref;
 249         } else {
 250                 free(ref);
 251         }
 252
 253         return refs;
 254 }
 255
 256 static struct ref *get_refs(int for_push)
 257 {
 258         struct discovery *heads;
 259
 260         if (for_push)
 261                 heads = discover_refs("git-receive-pack");
 262         else
 263                 heads = discover_refs("git-upload-pack");
 264
 265         if (heads->proto_git)
 266                 return parse_git_refs(heads, for_push);
 267         return parse_info_refs(heads);
 268 }
 269
 270 static void output_refs(struct ref *refs)
 271 {
 272         struct ref *posn;
 273         for (posn = refs; posn; posn = posn->next) {
 274                 if (posn->symref)
 275                         printf("@%s %s\n", posn->symref, posn->name);
 276                 else
 277                         printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 278         }
 279         printf("\n");
 280         fflush(stdout);
 281         free_refs(refs);
 282 }
 283
 284 struct rpc_state {
 285         const char *service_name;
 286         const char **argv;
 287         struct strbuf *stdin_preamble;
 288         char *service_url;
 289         char *hdr_content_type;
 290         char *hdr_accept;
 291         char *buf;
 292         size_t alloc;
 293         size_t len;
 294         size_t pos;
 295         int in;
 296         int out;
 297         struct strbuf result;
 298         unsigned gzip_request : 1;
 299         unsigned initial_buffer : 1;
 300 };
 301
 302 static size_t rpc_out(void *ptr, size_t eltsize,
 303                 size_t nmemb, void *buffer_)
 304 {
 305         size_t max = eltsize * nmemb;
 306         struct rpc_state *rpc = buffer_;
 307         size_t avail = rpc->len - rpc->pos;
 308
 309         if (!avail) {
 310                 rpc->initial_buffer = 0;
 311                 avail = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
 312                 if (!avail)
 313                         return 0;
 314                 rpc->pos = 0;
 315                 rpc->len = avail;
 316         }
 317
 318         if (max < avail)
 319                 avail = max;
 320         memcpy(ptr, rpc->buf + rpc->pos, avail);
 321         rpc->pos += avail;
 322         return avail;
 323 }
 324
 325 #ifndef NO_CURL_IOCTL
 326 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 327 {
 328         struct rpc_state *rpc = clientp;
 329
 330         switch (cmd) {
 331         case CURLIOCMD_NOP:
 332                 return CURLIOE_OK;
 333
 334         case CURLIOCMD_RESTARTREAD:
 335                 if (rpc->initial_buffer) {
 336                         rpc->pos = 0;
 337                         return CURLIOE_OK;
 338                 }
 339                 fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
 340                 return CURLIOE_FAILRESTART;
 341
 342         default:
 343                 return CURLIOE_UNKNOWNCMD;
 344         }
 345 }
 346 #endif
 347
 348 static size_t rpc_in(char *ptr, size_t eltsize,
 349                 size_t nmemb, void *buffer_)
 350 {
 351         size_t size = eltsize * nmemb;
 352         struct rpc_state *rpc = buffer_;
 353         write_or_die(rpc->in, ptr, size);
 354         return size;
 355 }
 356
 357 static int run_slot(struct active_request_slot *slot)
 358 {
 359         int err;
 360         struct slot_results results;
 361
 362         slot->results = &results;
 363         slot->curl_result = curl_easy_perform(slot->curl);
 364         finish_active_slot(slot);
 365
 366         err = handle_curl_result(&results);
 367         if (err != HTTP_OK && err != HTTP_REAUTH) {
 368                 error("RPC failed; result=%d, HTTP code = %ld",
 369                       results.curl_result, results.http_code);
 370         }
 371
 372         return err;
 373 }
 374
 375 static int probe_rpc(struct rpc_state *rpc)
 376 {
 377         struct active_request_slot *slot;
 378         struct curl_slist *headers = NULL;
 379         struct strbuf buf = STRBUF_INIT;
 380         int err;
 381
 382         slot = get_active_slot();
 383
 384         headers = curl_slist_append(headers, rpc->hdr_content_type);
 385         headers = curl_slist_append(headers, rpc->hdr_accept);
 386
 387         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 388         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 389         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 390         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 391         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 392         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 393         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 394         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 395         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 396
 397         err = run_slot(slot);
 398
 399         curl_slist_free_all(headers);
 400         strbuf_release(&buf);
 401         return err;
 402 }
 403
 404 static int post_rpc(struct rpc_state *rpc)
 405 {
 406         struct active_request_slot *slot;
 407         struct curl_slist *headers = NULL;
 408         int use_gzip = rpc->gzip_request;
 409         char *gzip_body = NULL;
 410         size_t gzip_size = 0;
 411         int err, large_request = 0;
 412
 413         /* Try to load the entire request, if we can fit it into the
 414          * allocated buffer space we can use HTTP/1.0 and avoid the
 415          * chunked encoding mess.
 416          */
 417         while (1) {
 418                 size_t left = rpc->alloc - rpc->len;
 419                 char *buf = rpc->buf + rpc->len;
 420                 int n;
 421
 422                 if (left < LARGE_PACKET_MAX) {
 423                         large_request = 1;
 424                         use_gzip = 0;
 425                         break;
 426                 }
 427
 428                 n = packet_read_line(rpc->out, buf, left);
 429                 if (!n)
 430                         break;
 431                 rpc->len += n;
 432         }
 433
 434         if (large_request) {
 435                 do {
 436                         err = probe_rpc(rpc);
 437                 } while (err == HTTP_REAUTH);
 438                 if (err != HTTP_OK)
 439                         return -1;
 440         }
 441
 442         headers = curl_slist_append(headers, rpc->hdr_content_type);
 443         headers = curl_slist_append(headers, rpc->hdr_accept);
 444         headers = curl_slist_append(headers, "Expect:");
 445
 446 retry:
 447         slot = get_active_slot();
 448
 449         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 450         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 451         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 452         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 453
 454         if (large_request) {
 455                 /* The request body is large and the size cannot be predicted.
 456                  * We must use chunked encoding to send it.
 457                  */
 458                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 459                 rpc->initial_buffer = 1;
 460                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 461                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 462 #ifndef NO_CURL_IOCTL
 463                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 464                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 465 #endif
 466                 if (options.verbosity > 1) {
 467                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 468                         fflush(stderr);
 469                 }
 470
 471         } else if (gzip_body) {
 472                 /*
 473                  * If we are looping to retry authentication, then the previous
 474                  * run will have set up the headers and gzip buffer already,
 475                  * and we just need to send it.
 476                  */
 477                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 478                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 479
 480         } else if (use_gzip && 1024 < rpc->len) {
 481                 /* The client backend isn't giving us compressed data so
 482                  * we can try to deflate it ourselves, this may save on.
 483                  * the transfer time.
 484                  */
 485                 git_zstream stream;
 486                 int ret;
 487
 488                 memset(&stream, 0, sizeof(stream));
 489                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 490                 gzip_size = git_deflate_bound(&stream, rpc->len);
 491                 gzip_body = xmalloc(gzip_size);
 492
 493                 stream.next_in = (unsigned char *)rpc->buf;
 494                 stream.avail_in = rpc->len;
 495                 stream.next_out = (unsigned char *)gzip_body;
 496                 stream.avail_out = gzip_size;
 497
 498                 ret = git_deflate(&stream, Z_FINISH);
 499                 if (ret != Z_STREAM_END)
 500                         die("cannot deflate request; zlib deflate error %d", ret);
 501
 502                 ret = git_deflate_end_gently(&stream);
 503                 if (ret != Z_OK)
 504                         die("cannot deflate request; zlib end error %d", ret);
 505
 506                 gzip_size = stream.total_out;
 507
 508                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 509                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 510                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 511
 512                 if (options.verbosity > 1) {
 513                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 514                                 rpc->service_name,
 515                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
 516                         fflush(stderr);
 517                 }
 518         } else {
 519                 /* We know the complete request size in advance, use the
 520                  * more normal Content-Length approach.
 521                  */
 522                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 523                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 524                 if (options.verbosity > 1) {
 525                         fprintf(stderr, "POST %s (%lu bytes)\n",
 526                                 rpc->service_name, (unsigned long)rpc->len);
 527                         fflush(stderr);
 528                 }
 529         }
 530
 531         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 532         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 533         curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 534
 535         err = run_slot(slot);
 536         if (err == HTTP_REAUTH && !large_request)
 537                 goto retry;
 538         if (err != HTTP_OK)
 539                 err = -1;
 540
 541         curl_slist_free_all(headers);
 542         free(gzip_body);
 543         return err;
 544 }
 545
 546 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 547 {
 548         const char *svc = rpc->service_name;
 549         struct strbuf buf = STRBUF_INIT;
 550         struct strbuf *preamble = rpc->stdin_preamble;
 551         struct child_process client;
 552         int err = 0;
 553
 554         memset(&client, 0, sizeof(client));
 555         client.in = -1;
 556         client.out = -1;
 557         client.git_cmd = 1;
 558         client.argv = rpc->argv;
 559         if (start_command(&client))
 560                 exit(1);
 561         if (preamble)
 562                 write_or_die(client.in, preamble->buf, preamble->len);
 563         if (heads)
 564                 write_or_die(client.in, heads->buf, heads->len);
 565
 566         rpc->alloc = http_post_buffer;
 567         rpc->buf = xmalloc(rpc->alloc);
 568         rpc->in = client.in;
 569         rpc->out = client.out;
 570         strbuf_init(&rpc->result, 0);
 571
 572         strbuf_addf(&buf, "%s%s", url, svc);
 573         rpc->service_url = strbuf_detach(&buf, NULL);
 574
 575         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 576         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 577
 578         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 579         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 580
 581         while (!err) {
 582                 int n = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
 583                 if (!n)
 584                         break;
 585                 rpc->pos = 0;
 586                 rpc->len = n;
 587                 err |= post_rpc(rpc);
 588         }
 589
 590         close(client.in);
 591         client.in = -1;
 592         if (!err) {
 593                 strbuf_read(&rpc->result, client.out, 0);
 594         } else {
 595                 char buf[4096];
 596                 for (;;)
 597                         if (xread(client.out, buf, sizeof(buf)) <= 0)
 598                                 break;
 599         }
 600
 601         close(client.out);
 602         client.out = -1;
 603
 604         err |= finish_command(&client);
 605         free(rpc->service_url);
 606         free(rpc->hdr_content_type);
 607         free(rpc->hdr_accept);
 608         free(rpc->buf);
 609         strbuf_release(&buf);
 610         return err;
 611 }
 612
 613 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 614 {
 615         struct walker *walker;
 616         char **targets = xmalloc(nr_heads * sizeof(char*));
 617         int ret, i;
 618
 619         if (options.depth)
 620                 die("dumb http transport does not support --depth");
 621         for (i = 0; i < nr_heads; i++)
 622                 targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 623
 624         walker = get_http_walker(url);
 625         walker->get_all = 1;
 626         walker->get_tree = 1;
 627         walker->get_history = 1;
 628         walker->get_verbosely = options.verbosity >= 3;
 629         walker->get_recover = 0;
 630         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 631         walker_free(walker);
 632
 633         for (i = 0; i < nr_heads; i++)
 634                 free(targets[i]);
 635         free(targets);
 636
 637         return ret ? error("Fetch failed.") : 0;
 638 }
 639
 640 static int fetch_git(struct discovery *heads,
 641         int nr_heads, struct ref **to_fetch)
 642 {
 643         struct rpc_state rpc;
 644         struct strbuf preamble = STRBUF_INIT;
 645         char *depth_arg = NULL;
 646         int argc = 0, i, err;
 647         const char *argv[15];
 648
 649         argv[argc++] = "fetch-pack";
 650         argv[argc++] = "--stateless-rpc";
 651         argv[argc++] = "--stdin";
 652         argv[argc++] = "--lock-pack";
 653         if (options.followtags)
 654                 argv[argc++] = "--include-tag";
 655         if (options.thin)
 656                 argv[argc++] = "--thin";
 657         if (options.verbosity >= 3) {
 658                 argv[argc++] = "-v";
 659                 argv[argc++] = "-v";
 660         }
 661         if (!options.progress)
 662                 argv[argc++] = "--no-progress";
 663         if (options.depth) {
 664                 struct strbuf buf = STRBUF_INIT;
 665                 strbuf_addf(&buf, "--depth=%lu", options.depth);
 666                 depth_arg = strbuf_detach(&buf, NULL);
 667                 argv[argc++] = depth_arg;
 668         }
 669         argv[argc++] = url;
 670         argv[argc++] = NULL;
 671
 672         for (i = 0; i < nr_heads; i++) {
 673                 struct ref *ref = to_fetch[i];
 674                 if (!ref->name || !*ref->name)
 675                         die("cannot fetch by sha1 over smart http");
 676                 packet_buf_write(&preamble, "%s\n", ref->name);
 677         }
 678         packet_buf_flush(&preamble);
 679
 680         memset(&rpc, 0, sizeof(rpc));
 681         rpc.service_name = "git-upload-pack",
 682         rpc.argv = argv;
 683         rpc.stdin_preamble = &preamble;
 684         rpc.gzip_request = 1;
 685
 686         err = rpc_service(&rpc, heads);
 687         if (rpc.result.len)
 688                 safe_write(1, rpc.result.buf, rpc.result.len);
 689         strbuf_release(&rpc.result);
 690         strbuf_release(&preamble);
 691         free(depth_arg);
 692         return err;
 693 }
 694
 695 static int fetch(int nr_heads, struct ref **to_fetch)
 696 {
 697         struct discovery *d = discover_refs("git-upload-pack");
 698         if (d->proto_git)
 699                 return fetch_git(d, nr_heads, to_fetch);
 700         else
 701                 return fetch_dumb(nr_heads, to_fetch);
 702 }
 703
 704 static void parse_fetch(struct strbuf *buf)
 705 {
 706         struct ref **to_fetch = NULL;
 707         struct ref *list_head = NULL;
 708         struct ref **list = &list_head;
 709         int alloc_heads = 0, nr_heads = 0;
 710
 711         do {
 712                 if (!prefixcmp(buf->buf, "fetch ")) {
 713                         char *p = buf->buf + strlen("fetch ");
 714                         char *name;
 715                         struct ref *ref;
 716                         unsigned char old_sha1[20];
 717
 718                         if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 719                                 die("protocol error: expected sha/ref, got %s'", p);
 720                         if (p[40] == ' ')
 721                                 name = p + 41;
 722                         else if (!p[40])
 723                                 name = "";
 724                         else
 725                                 die("protocol error: expected sha/ref, got %s'", p);
 726
 727                         ref = alloc_ref(name);
 728                         hashcpy(ref->old_sha1, old_sha1);
 729
 730                         *list = ref;
 731                         list = &ref->next;
 732
 733                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 734                         to_fetch[nr_heads++] = ref;
 735                 }
 736                 else
 737                         die("http transport does not support %s", buf->buf);
 738
 739                 strbuf_reset(buf);
 740                 if (strbuf_getline(buf, stdin, '\n') == EOF)
 741                         return;
 742                 if (!*buf->buf)
 743                         break;
 744         } while (1);
 745
 746         if (fetch(nr_heads, to_fetch))
 747                 exit(128); /* error already reported */
 748         free_refs(list_head);
 749         free(to_fetch);
 750
 751         printf("\n");
 752         fflush(stdout);
 753         strbuf_reset(buf);
 754 }
 755
 756 static int push_dav(int nr_spec, char **specs)
 757 {
 758         const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 759         int argc = 0, i;
 760
 761         argv[argc++] = "http-push";
 762         argv[argc++] = "--helper-status";
 763         if (options.dry_run)
 764                 argv[argc++] = "--dry-run";
 765         if (options.verbosity > 1)
 766                 argv[argc++] = "--verbose";
 767         argv[argc++] = url;
 768         for (i = 0; i < nr_spec; i++)
 769                 argv[argc++] = specs[i];
 770         argv[argc++] = NULL;
 771
 772         if (run_command_v_opt(argv, RUN_GIT_CMD))
 773                 die("git-%s failed", argv[0]);
 774         free(argv);
 775         return 0;
 776 }
 777
 778 static int push_git(struct discovery *heads, int nr_spec, char **specs)
 779 {
 780         struct rpc_state rpc;
 781         const char **argv;
 782         int argc = 0, i, err;
 783
 784         argv = xmalloc((10 + nr_spec) * sizeof(char*));
 785         argv[argc++] = "send-pack";
 786         argv[argc++] = "--stateless-rpc";
 787         argv[argc++] = "--helper-status";
 788         if (options.thin)
 789                 argv[argc++] = "--thin";
 790         if (options.dry_run)
 791                 argv[argc++] = "--dry-run";
 792         if (options.verbosity == 0)
 793                 argv[argc++] = "--quiet";
 794         else if (options.verbosity > 1)
 795                 argv[argc++] = "--verbose";
 796         argv[argc++] = options.progress ? "--progress" : "--no-progress";
 797         argv[argc++] = url;
 798         for (i = 0; i < nr_spec; i++)
 799                 argv[argc++] = specs[i];
 800         argv[argc++] = NULL;
 801
 802         memset(&rpc, 0, sizeof(rpc));
 803         rpc.service_name = "git-receive-pack",
 804         rpc.argv = argv;
 805
 806         err = rpc_service(&rpc, heads);
 807         if (rpc.result.len)
 808                 safe_write(1, rpc.result.buf, rpc.result.len);
 809         strbuf_release(&rpc.result);
 810         free(argv);
 811         return err;
 812 }
 813
 814 static int push(int nr_spec, char **specs)
 815 {
 816         struct discovery *heads = discover_refs("git-receive-pack");
 817         int ret;
 818
 819         if (heads->proto_git)
 820                 ret = push_git(heads, nr_spec, specs);
 821         else
 822                 ret = push_dav(nr_spec, specs);
 823         free_discovery(heads);
 824         return ret;
 825 }
 826
 827 static void parse_push(struct strbuf *buf)
 828 {
 829         char **specs = NULL;
 830         int alloc_spec = 0, nr_spec = 0, i, ret;
 831
 832         do {
 833                 if (!prefixcmp(buf->buf, "push ")) {
 834                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 835                         specs[nr_spec++] = xstrdup(buf->buf + 5);
 836                 }
 837                 else
 838                         die("http transport does not support %s", buf->buf);
 839
 840                 strbuf_reset(buf);
 841                 if (strbuf_getline(buf, stdin, '\n') == EOF)
 842                         goto free_specs;
 843                 if (!*buf->buf)
 844                         break;
 845         } while (1);
 846
 847         ret = push(nr_spec, specs);
 848         printf("\n");
 849         fflush(stdout);
 850
 851         if (ret)
 852                 exit(128); /* error already reported */
 853
 854  free_specs:
 855         for (i = 0; i < nr_spec; i++)
 856                 free(specs[i]);
 857         free(specs);
 858 }
 859
 860 int main(int argc, const char **argv)
 861 {
 862         struct strbuf buf = STRBUF_INIT;
 863         int nongit;
 864
 865         git_extract_argv0_path(argv[0]);
 866         setup_git_directory_gently(&nongit);
 867         if (argc < 2) {
 868                 fprintf(stderr, "Remote needed\n");
 869                 return 1;
 870         }
 871
 872         options.verbosity = 1;
 873         options.progress = !!isatty(2);
 874         options.thin = 1;
 875
 876         remote = remote_get(argv[1]);
 877
 878         if (argc > 2) {
 879                 end_url_with_slash(&buf, argv[2]);
 880         } else {
 881                 end_url_with_slash(&buf, remote->url[0]);
 882         }
 883
 884         url = strbuf_detach(&buf, NULL);
 885
 886         http_init(remote, url, 0);
 887
 888         do {
 889                 if (strbuf_getline(&buf, stdin, '\n') == EOF) {
 890                         if (ferror(stdin))
 891                                 fprintf(stderr, "Error reading command stream\n");
 892                         else
 893                                 fprintf(stderr, "Unexpected end of command stream\n");
 894                         return 1;
 895                 }
 896                 if (buf.len == 0)
 897                         break;
 898                 if (!prefixcmp(buf.buf, "fetch ")) {
 899                         if (nongit)
 900                                 die("Fetch attempted without a local repo");
 901                         parse_fetch(&buf);
 902
 903                 } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
 904                         int for_push = !!strstr(buf.buf + 4, "for-push");
 905                         output_refs(get_refs(for_push));
 906
 907                 } else if (!prefixcmp(buf.buf, "push ")) {
 908                         parse_push(&buf);
 909
 910                 } else if (!prefixcmp(buf.buf, "option ")) {
 911                         char *name = buf.buf + strlen("option ");
 912                         char *value = strchr(name, ' ');
 913                         int result;
 914
 915                         if (value)
 916                                 *value++ = '\0';
 917                         else
 918                                 value = "true";
 919
 920                         result = set_option(name, value);
 921                         if (!result)
 922                                 printf("ok\n");
 923                         else if (result < 0)
 924                                 printf("error invalid value\n");
 925                         else
 926                                 printf("unsupported\n");
 927                         fflush(stdout);
 928
 929                 } else if (!strcmp(buf.buf, "capabilities")) {
 930                         printf("fetch\n");
 931                         printf("option\n");
 932                         printf("push\n");
 933                         printf("\n");
 934                         fflush(stdout);
 935                 } else {
 936                         fprintf(stderr, "Unknown command '%s'\n", buf.buf);
 937                         return 1;
 938                 }
 939                 strbuf_reset(&buf);
 940         } while (1);
 941
 942         http_cleanup();
 943
 944         return 0;
 945 }