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 buffer = STRBUF_INIT;
  96         struct discovery *last = last_discovery;
  97         char *refs_url;
  98         int http_ret, maybe_smart = 0;
  99
 100         if (last && !strcmp(service, last->service))
 101                 return last;
 102         free_discovery(last);
 103
 104         strbuf_addf(&buffer, "%sinfo/refs", url);
 105         if ((!prefixcmp(url, "http://") || !prefixcmp(url, "https://")) &&
 106              git_env_bool("GIT_SMART_HTTP", 1)) {
 107                 maybe_smart = 1;
 108                 if (!strchr(url, '?'))
 109                         strbuf_addch(&buffer, '?');
 110                 else
 111                         strbuf_addch(&buffer, '&');
 112                 strbuf_addf(&buffer, "service=%s", service);
 113         }
 114         refs_url = strbuf_detach(&buffer, NULL);
 115
 116         http_ret = http_get_strbuf(refs_url, &buffer, HTTP_NO_CACHE);
 117         switch (http_ret) {
 118         case HTTP_OK:
 119                 break;
 120         case HTTP_MISSING_TARGET:
 121                 die("%s not found: did you run git update-server-info on the"
 122                     " server?", refs_url);
 123         case HTTP_NOAUTH:
 124                 die("Authentication failed");
 125         default:
 126                 http_error(refs_url, http_ret);
 127                 die("HTTP request failed");
 128         }
 129
 130         last= xcalloc(1, sizeof(*last_discovery));
 131         last->service = service;
 132         last->buf_alloc = strbuf_detach(&buffer, &last->len);
 133         last->buf = last->buf_alloc;
 134
 135         if (maybe_smart && 5 <= last->len && last->buf[4] == '#') {
 136                 /* smart HTTP response; validate that the service
 137                  * pkt-line matches our request.
 138                  */
 139                 struct strbuf exp = STRBUF_INIT;
 140
 141                 if (packet_get_line(&buffer, &last->buf, &last->len) <= 0)
 142                         die("%s has invalid packet header", refs_url);
 143                 if (buffer.len && buffer.buf[buffer.len - 1] == '\n')
 144                         strbuf_setlen(&buffer, buffer.len - 1);
 145
 146                 strbuf_addf(&exp, "# service=%s", service);
 147                 if (strbuf_cmp(&exp, &buffer))
 148                         die("invalid server response; got '%s'", buffer.buf);
 149                 strbuf_release(&exp);
 150
 151                 /* The header can include additional metadata lines, up
 152                  * until a packet flush marker.  Ignore these now, but
 153                  * in the future we might start to scan them.
 154                  */
 155                 strbuf_reset(&buffer);
 156                 while (packet_get_line(&buffer, &last->buf, &last->len) > 0)
 157                         strbuf_reset(&buffer);
 158
 159                 last->proto_git = 1;
 160         }
 161
 162         free(refs_url);
 163         strbuf_release(&buffer);
 164         last_discovery = last;
 165         return last;
 166 }
 167
 168 static int write_discovery(int in, int out, void *data)
 169 {
 170         struct discovery *heads = data;
 171         int err = 0;
 172         if (write_in_full(out, heads->buf, heads->len) != heads->len)
 173                 err = 1;
 174         close(out);
 175         return err;
 176 }
 177
 178 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 179 {
 180         struct ref *list = NULL;
 181         struct async async;
 182
 183         memset(&async, 0, sizeof(async));
 184         async.proc = write_discovery;
 185         async.data = heads;
 186         async.out = -1;
 187
 188         if (start_async(&async))
 189                 die("cannot start thread to parse advertised refs");
 190         get_remote_heads(async.out, &list,
 191                         for_push ? REF_NORMAL : 0, NULL);
 192         close(async.out);
 193         if (finish_async(&async))
 194                 die("ref parsing thread failed");
 195         return list;
 196 }
 197
 198 static struct ref *parse_info_refs(struct discovery *heads)
 199 {
 200         char *data, *start, *mid;
 201         char *ref_name;
 202         int i = 0;
 203
 204         struct ref *refs = NULL;
 205         struct ref *ref = NULL;
 206         struct ref *last_ref = NULL;
 207
 208         data = heads->buf;
 209         start = NULL;
 210         mid = data;
 211         while (i < heads->len) {
 212                 if (!start) {
 213                         start = &data[i];
 214                 }
 215                 if (data[i] == '\t')
 216                         mid = &data[i];
 217                 if (data[i] == '\n') {
 218                         if (mid - start != 40)
 219                                 die("%sinfo/refs not valid: is this a git repository?", url);
 220                         data[i] = 0;
 221                         ref_name = mid + 1;
 222                         ref = xmalloc(sizeof(struct ref) +
 223                                       strlen(ref_name) + 1);
 224                         memset(ref, 0, sizeof(struct ref));
 225                         strcpy(ref->name, ref_name);
 226                         get_sha1_hex(start, ref->old_sha1);
 227                         if (!refs)
 228                                 refs = ref;
 229                         if (last_ref)
 230                                 last_ref->next = ref;
 231                         last_ref = ref;
 232                         start = NULL;
 233                 }
 234                 i++;
 235         }
 236
 237         ref = alloc_ref("HEAD");
 238         if (!http_fetch_ref(url, ref) &&
 239             !resolve_remote_symref(ref, refs)) {
 240                 ref->next = refs;
 241                 refs = ref;
 242         } else {
 243                 free(ref);
 244         }
 245
 246         return refs;
 247 }
 248
 249 static struct ref *get_refs(int for_push)
 250 {
 251         struct discovery *heads;
 252
 253         if (for_push)
 254                 heads = discover_refs("git-receive-pack");
 255         else
 256                 heads = discover_refs("git-upload-pack");
 257
 258         if (heads->proto_git)
 259                 return parse_git_refs(heads, for_push);
 260         return parse_info_refs(heads);
 261 }
 262
 263 static void output_refs(struct ref *refs)
 264 {
 265         struct ref *posn;
 266         for (posn = refs; posn; posn = posn->next) {
 267                 if (posn->symref)
 268                         printf("@%s %s\n", posn->symref, posn->name);
 269                 else
 270                         printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 271         }
 272         printf("\n");
 273         fflush(stdout);
 274         free_refs(refs);
 275 }
 276
 277 struct rpc_state {
 278         const char *service_name;
 279         const char **argv;
 280         struct strbuf *stdin_preamble;
 281         char *service_url;
 282         char *hdr_content_type;
 283         char *hdr_accept;
 284         char *buf;
 285         size_t alloc;
 286         size_t len;
 287         size_t pos;
 288         int in;
 289         int out;
 290         struct strbuf result;
 291         unsigned gzip_request : 1;
 292         unsigned initial_buffer : 1;
 293 };
 294
 295 static size_t rpc_out(void *ptr, size_t eltsize,
 296                 size_t nmemb, void *buffer_)
 297 {
 298         size_t max = eltsize * nmemb;
 299         struct rpc_state *rpc = buffer_;
 300         size_t avail = rpc->len - rpc->pos;
 301
 302         if (!avail) {
 303                 rpc->initial_buffer = 0;
 304                 avail = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
 305                 if (!avail)
 306                         return 0;
 307                 rpc->pos = 0;
 308                 rpc->len = avail;
 309         }
 310
 311         if (max < avail)
 312                 avail = max;
 313         memcpy(ptr, rpc->buf + rpc->pos, avail);
 314         rpc->pos += avail;
 315         return avail;
 316 }
 317
 318 #ifndef NO_CURL_IOCTL
 319 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 320 {
 321         struct rpc_state *rpc = clientp;
 322
 323         switch (cmd) {
 324         case CURLIOCMD_NOP:
 325                 return CURLIOE_OK;
 326
 327         case CURLIOCMD_RESTARTREAD:
 328                 if (rpc->initial_buffer) {
 329                         rpc->pos = 0;
 330                         return CURLIOE_OK;
 331                 }
 332                 fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
 333                 return CURLIOE_FAILRESTART;
 334
 335         default:
 336                 return CURLIOE_UNKNOWNCMD;
 337         }
 338 }
 339 #endif
 340
 341 static size_t rpc_in(char *ptr, size_t eltsize,
 342                 size_t nmemb, void *buffer_)
 343 {
 344         size_t size = eltsize * nmemb;
 345         struct rpc_state *rpc = buffer_;
 346         write_or_die(rpc->in, ptr, size);
 347         return size;
 348 }
 349
 350 static int run_slot(struct active_request_slot *slot)
 351 {
 352         int err;
 353         struct slot_results results;
 354
 355         slot->results = &results;
 356         slot->curl_result = curl_easy_perform(slot->curl);
 357         finish_active_slot(slot);
 358
 359         err = handle_curl_result(slot);
 360         if (err != HTTP_OK && err != HTTP_REAUTH) {
 361                 error("RPC failed; result=%d, HTTP code = %ld",
 362                       results.curl_result, results.http_code);
 363         }
 364
 365         return err;
 366 }
 367
 368 static int probe_rpc(struct rpc_state *rpc)
 369 {
 370         struct active_request_slot *slot;
 371         struct curl_slist *headers = NULL;
 372         struct strbuf buf = STRBUF_INIT;
 373         int err;
 374
 375         slot = get_active_slot();
 376
 377         headers = curl_slist_append(headers, rpc->hdr_content_type);
 378         headers = curl_slist_append(headers, rpc->hdr_accept);
 379
 380         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 381         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 382         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 383         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 384         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 385         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 386         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 387         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 388         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 389
 390         err = run_slot(slot);
 391
 392         curl_slist_free_all(headers);
 393         strbuf_release(&buf);
 394         return err;
 395 }
 396
 397 static int post_rpc(struct rpc_state *rpc)
 398 {
 399         struct active_request_slot *slot;
 400         struct curl_slist *headers = NULL;
 401         int use_gzip = rpc->gzip_request;
 402         char *gzip_body = NULL;
 403         int err, large_request = 0;
 404
 405         /* Try to load the entire request, if we can fit it into the
 406          * allocated buffer space we can use HTTP/1.0 and avoid the
 407          * chunked encoding mess.
 408          */
 409         while (1) {
 410                 size_t left = rpc->alloc - rpc->len;
 411                 char *buf = rpc->buf + rpc->len;
 412                 int n;
 413
 414                 if (left < LARGE_PACKET_MAX) {
 415                         large_request = 1;
 416                         use_gzip = 0;
 417                         break;
 418                 }
 419
 420                 n = packet_read_line(rpc->out, buf, left);
 421                 if (!n)
 422                         break;
 423                 rpc->len += n;
 424         }
 425
 426         if (large_request) {
 427                 do {
 428                         err = probe_rpc(rpc);
 429                 } while (err == HTTP_REAUTH);
 430                 if (err != HTTP_OK)
 431                         return -1;
 432         }
 433
 434         slot = get_active_slot();
 435
 436         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 437         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 438         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 439         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 440
 441         headers = curl_slist_append(headers, rpc->hdr_content_type);
 442         headers = curl_slist_append(headers, rpc->hdr_accept);
 443         headers = curl_slist_append(headers, "Expect:");
 444
 445         if (large_request) {
 446                 /* The request body is large and the size cannot be predicted.
 447                  * We must use chunked encoding to send it.
 448                  */
 449                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 450                 rpc->initial_buffer = 1;
 451                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 452                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 453 #ifndef NO_CURL_IOCTL
 454                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 455                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 456 #endif
 457                 if (options.verbosity > 1) {
 458                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 459                         fflush(stderr);
 460                 }
 461
 462         } else if (use_gzip && 1024 < rpc->len) {
 463                 /* The client backend isn't giving us compressed data so
 464                  * we can try to deflate it ourselves, this may save on.
 465                  * the transfer time.
 466                  */
 467                 size_t size;
 468                 git_zstream stream;
 469                 int ret;
 470
 471                 memset(&stream, 0, sizeof(stream));
 472                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 473                 size = git_deflate_bound(&stream, rpc->len);
 474                 gzip_body = xmalloc(size);
 475
 476                 stream.next_in = (unsigned char *)rpc->buf;
 477                 stream.avail_in = rpc->len;
 478                 stream.next_out = (unsigned char *)gzip_body;
 479                 stream.avail_out = size;
 480
 481                 ret = git_deflate(&stream, Z_FINISH);
 482                 if (ret != Z_STREAM_END)
 483                         die("cannot deflate request; zlib deflate error %d", ret);
 484
 485                 ret = git_deflate_end_gently(&stream);
 486                 if (ret != Z_OK)
 487                         die("cannot deflate request; zlib end error %d", ret);
 488
 489                 size = stream.total_out;
 490
 491                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 492                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 493                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, size);
 494
 495                 if (options.verbosity > 1) {
 496                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 497                                 rpc->service_name,
 498                                 (unsigned long)rpc->len, (unsigned long)size);
 499                         fflush(stderr);
 500                 }
 501         } else {
 502                 /* We know the complete request size in advance, use the
 503                  * more normal Content-Length approach.
 504                  */
 505                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 506                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 507                 if (options.verbosity > 1) {
 508                         fprintf(stderr, "POST %s (%lu bytes)\n",
 509                                 rpc->service_name, (unsigned long)rpc->len);
 510                         fflush(stderr);
 511                 }
 512         }
 513
 514         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 515         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 516         curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 517
 518         do {
 519                 err = run_slot(slot);
 520         } while (err == HTTP_REAUTH && !large_request && !use_gzip);
 521         if (err != HTTP_OK)
 522                 err = -1;
 523
 524         curl_slist_free_all(headers);
 525         free(gzip_body);
 526         return err;
 527 }
 528
 529 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 530 {
 531         const char *svc = rpc->service_name;
 532         struct strbuf buf = STRBUF_INIT;
 533         struct strbuf *preamble = rpc->stdin_preamble;
 534         struct child_process client;
 535         int err = 0;
 536
 537         memset(&client, 0, sizeof(client));
 538         client.in = -1;
 539         client.out = -1;
 540         client.git_cmd = 1;
 541         client.argv = rpc->argv;
 542         if (start_command(&client))
 543                 exit(1);
 544         if (preamble)
 545                 write_or_die(client.in, preamble->buf, preamble->len);
 546         if (heads)
 547                 write_or_die(client.in, heads->buf, heads->len);
 548
 549         rpc->alloc = http_post_buffer;
 550         rpc->buf = xmalloc(rpc->alloc);
 551         rpc->in = client.in;
 552         rpc->out = client.out;
 553         strbuf_init(&rpc->result, 0);
 554
 555         strbuf_addf(&buf, "%s%s", url, svc);
 556         rpc->service_url = strbuf_detach(&buf, NULL);
 557
 558         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 559         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 560
 561         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 562         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 563
 564         while (!err) {
 565                 int n = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
 566                 if (!n)
 567                         break;
 568                 rpc->pos = 0;
 569                 rpc->len = n;
 570                 err |= post_rpc(rpc);
 571         }
 572
 573         close(client.in);
 574         client.in = -1;
 575         if (!err) {
 576                 strbuf_read(&rpc->result, client.out, 0);
 577         } else {
 578                 char buf[4096];
 579                 for (;;)
 580                         if (xread(client.out, buf, sizeof(buf)) <= 0)
 581                                 break;
 582         }
 583
 584         close(client.out);
 585         client.out = -1;
 586
 587         err |= finish_command(&client);
 588         free(rpc->service_url);
 589         free(rpc->hdr_content_type);
 590         free(rpc->hdr_accept);
 591         free(rpc->buf);
 592         strbuf_release(&buf);
 593         return err;
 594 }
 595
 596 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 597 {
 598         struct walker *walker;
 599         char **targets = xmalloc(nr_heads * sizeof(char*));
 600         int ret, i;
 601
 602         if (options.depth)
 603                 die("dumb http transport does not support --depth");
 604         for (i = 0; i < nr_heads; i++)
 605                 targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 606
 607         walker = get_http_walker(url);
 608         walker->get_all = 1;
 609         walker->get_tree = 1;
 610         walker->get_history = 1;
 611         walker->get_verbosely = options.verbosity >= 3;
 612         walker->get_recover = 0;
 613         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 614         walker_free(walker);
 615
 616         for (i = 0; i < nr_heads; i++)
 617                 free(targets[i]);
 618         free(targets);
 619
 620         return ret ? error("Fetch failed.") : 0;
 621 }
 622
 623 static int fetch_git(struct discovery *heads,
 624         int nr_heads, struct ref **to_fetch)
 625 {
 626         struct rpc_state rpc;
 627         struct strbuf preamble = STRBUF_INIT;
 628         char *depth_arg = NULL;
 629         int argc = 0, i, err;
 630         const char *argv[15];
 631
 632         argv[argc++] = "fetch-pack";
 633         argv[argc++] = "--stateless-rpc";
 634         argv[argc++] = "--stdin";
 635         argv[argc++] = "--lock-pack";
 636         if (options.followtags)
 637                 argv[argc++] = "--include-tag";
 638         if (options.thin)
 639                 argv[argc++] = "--thin";
 640         if (options.verbosity >= 3) {
 641                 argv[argc++] = "-v";
 642                 argv[argc++] = "-v";
 643         }
 644         if (!options.progress)
 645                 argv[argc++] = "--no-progress";
 646         if (options.depth) {
 647                 struct strbuf buf = STRBUF_INIT;
 648                 strbuf_addf(&buf, "--depth=%lu", options.depth);
 649                 depth_arg = strbuf_detach(&buf, NULL);
 650                 argv[argc++] = depth_arg;
 651         }
 652         argv[argc++] = url;
 653         argv[argc++] = NULL;
 654
 655         for (i = 0; i < nr_heads; i++) {
 656                 struct ref *ref = to_fetch[i];
 657                 if (!ref->name || !*ref->name)
 658                         die("cannot fetch by sha1 over smart http");
 659                 packet_buf_write(&preamble, "%s\n", ref->name);
 660         }
 661         packet_buf_flush(&preamble);
 662
 663         memset(&rpc, 0, sizeof(rpc));
 664         rpc.service_name = "git-upload-pack",
 665         rpc.argv = argv;
 666         rpc.stdin_preamble = &preamble;
 667         rpc.gzip_request = 1;
 668
 669         err = rpc_service(&rpc, heads);
 670         if (rpc.result.len)
 671                 safe_write(1, rpc.result.buf, rpc.result.len);
 672         strbuf_release(&rpc.result);
 673         strbuf_release(&preamble);
 674         free(depth_arg);
 675         return err;
 676 }
 677
 678 static int fetch(int nr_heads, struct ref **to_fetch)
 679 {
 680         struct discovery *d = discover_refs("git-upload-pack");
 681         if (d->proto_git)
 682                 return fetch_git(d, nr_heads, to_fetch);
 683         else
 684                 return fetch_dumb(nr_heads, to_fetch);
 685 }
 686
 687 static void parse_fetch(struct strbuf *buf)
 688 {
 689         struct ref **to_fetch = NULL;
 690         struct ref *list_head = NULL;
 691         struct ref **list = &list_head;
 692         int alloc_heads = 0, nr_heads = 0;
 693
 694         do {
 695                 if (!prefixcmp(buf->buf, "fetch ")) {
 696                         char *p = buf->buf + strlen("fetch ");
 697                         char *name;
 698                         struct ref *ref;
 699                         unsigned char old_sha1[20];
 700
 701                         if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 702                                 die("protocol error: expected sha/ref, got %s'", p);
 703                         if (p[40] == ' ')
 704                                 name = p + 41;
 705                         else if (!p[40])
 706                                 name = "";
 707                         else
 708                                 die("protocol error: expected sha/ref, got %s'", p);
 709
 710                         ref = alloc_ref(name);
 711                         hashcpy(ref->old_sha1, old_sha1);
 712
 713                         *list = ref;
 714                         list = &ref->next;
 715
 716                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 717                         to_fetch[nr_heads++] = ref;
 718                 }
 719                 else
 720                         die("http transport does not support %s", buf->buf);
 721
 722                 strbuf_reset(buf);
 723                 if (strbuf_getline(buf, stdin, '\n') == EOF)
 724                         return;
 725                 if (!*buf->buf)
 726                         break;
 727         } while (1);
 728
 729         if (fetch(nr_heads, to_fetch))
 730                 exit(128); /* error already reported */
 731         free_refs(list_head);
 732         free(to_fetch);
 733
 734         printf("\n");
 735         fflush(stdout);
 736         strbuf_reset(buf);
 737 }
 738
 739 static int push_dav(int nr_spec, char **specs)
 740 {
 741         const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 742         int argc = 0, i;
 743
 744         argv[argc++] = "http-push";
 745         argv[argc++] = "--helper-status";
 746         if (options.dry_run)
 747                 argv[argc++] = "--dry-run";
 748         if (options.verbosity > 1)
 749                 argv[argc++] = "--verbose";
 750         argv[argc++] = url;
 751         for (i = 0; i < nr_spec; i++)
 752                 argv[argc++] = specs[i];
 753         argv[argc++] = NULL;
 754
 755         if (run_command_v_opt(argv, RUN_GIT_CMD))
 756                 die("git-%s failed", argv[0]);
 757         free(argv);
 758         return 0;
 759 }
 760
 761 static int push_git(struct discovery *heads, int nr_spec, char **specs)
 762 {
 763         struct rpc_state rpc;
 764         const char **argv;
 765         int argc = 0, i, err;
 766
 767         argv = xmalloc((10 + nr_spec) * sizeof(char*));
 768         argv[argc++] = "send-pack";
 769         argv[argc++] = "--stateless-rpc";
 770         argv[argc++] = "--helper-status";
 771         if (options.thin)
 772                 argv[argc++] = "--thin";
 773         if (options.dry_run)
 774                 argv[argc++] = "--dry-run";
 775         if (options.verbosity == 0)
 776                 argv[argc++] = "--quiet";
 777         else if (options.verbosity > 1)
 778                 argv[argc++] = "--verbose";
 779         argv[argc++] = options.progress ? "--progress" : "--no-progress";
 780         argv[argc++] = url;
 781         for (i = 0; i < nr_spec; i++)
 782                 argv[argc++] = specs[i];
 783         argv[argc++] = NULL;
 784
 785         memset(&rpc, 0, sizeof(rpc));
 786         rpc.service_name = "git-receive-pack",
 787         rpc.argv = argv;
 788
 789         err = rpc_service(&rpc, heads);
 790         if (rpc.result.len)
 791                 safe_write(1, rpc.result.buf, rpc.result.len);
 792         strbuf_release(&rpc.result);
 793         free(argv);
 794         return err;
 795 }
 796
 797 static int push(int nr_spec, char **specs)
 798 {
 799         struct discovery *heads = discover_refs("git-receive-pack");
 800         int ret;
 801
 802         if (heads->proto_git)
 803                 ret = push_git(heads, nr_spec, specs);
 804         else
 805                 ret = push_dav(nr_spec, specs);
 806         free_discovery(heads);
 807         return ret;
 808 }
 809
 810 static void parse_push(struct strbuf *buf)
 811 {
 812         char **specs = NULL;
 813         int alloc_spec = 0, nr_spec = 0, i, ret;
 814
 815         do {
 816                 if (!prefixcmp(buf->buf, "push ")) {
 817                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 818                         specs[nr_spec++] = xstrdup(buf->buf + 5);
 819                 }
 820                 else
 821                         die("http transport does not support %s", buf->buf);
 822
 823                 strbuf_reset(buf);
 824                 if (strbuf_getline(buf, stdin, '\n') == EOF)
 825                         goto free_specs;
 826                 if (!*buf->buf)
 827                         break;
 828         } while (1);
 829
 830         ret = push(nr_spec, specs);
 831         printf("\n");
 832         fflush(stdout);
 833
 834         if (ret)
 835                 exit(128); /* error already reported */
 836
 837  free_specs:
 838         for (i = 0; i < nr_spec; i++)
 839                 free(specs[i]);
 840         free(specs);
 841 }
 842
 843 int main(int argc, const char **argv)
 844 {
 845         struct strbuf buf = STRBUF_INIT;
 846         int nongit;
 847
 848         git_extract_argv0_path(argv[0]);
 849         setup_git_directory_gently(&nongit);
 850         if (argc < 2) {
 851                 fprintf(stderr, "Remote needed\n");
 852                 return 1;
 853         }
 854
 855         options.verbosity = 1;
 856         options.progress = !!isatty(2);
 857         options.thin = 1;
 858
 859         remote = remote_get(argv[1]);
 860
 861         if (argc > 2) {
 862                 end_url_with_slash(&buf, argv[2]);
 863         } else {
 864                 end_url_with_slash(&buf, remote->url[0]);
 865         }
 866
 867         url = strbuf_detach(&buf, NULL);
 868
 869         http_init(remote, url, 0);
 870
 871         do {
 872                 if (strbuf_getline(&buf, stdin, '\n') == EOF) {
 873                         if (ferror(stdin))
 874                                 fprintf(stderr, "Error reading command stream\n");
 875                         else
 876                                 fprintf(stderr, "Unexpected end of command stream\n");
 877                         return 1;
 878                 }
 879                 if (buf.len == 0)
 880                         break;
 881                 if (!prefixcmp(buf.buf, "fetch ")) {
 882                         if (nongit)
 883                                 die("Fetch attempted without a local repo");
 884                         parse_fetch(&buf);
 885
 886                 } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
 887                         int for_push = !!strstr(buf.buf + 4, "for-push");
 888                         output_refs(get_refs(for_push));
 889
 890                 } else if (!prefixcmp(buf.buf, "push ")) {
 891                         parse_push(&buf);
 892
 893                 } else if (!prefixcmp(buf.buf, "option ")) {
 894                         char *name = buf.buf + strlen("option ");
 895                         char *value = strchr(name, ' ');
 896                         int result;
 897
 898                         if (value)
 899                                 *value++ = '\0';
 900                         else
 901                                 value = "true";
 902
 903                         result = set_option(name, value);
 904                         if (!result)
 905                                 printf("ok\n");
 906                         else if (result < 0)
 907                                 printf("error invalid value\n");
 908                         else
 909                                 printf("unsupported\n");
 910                         fflush(stdout);
 911
 912                 } else if (!strcmp(buf.buf, "capabilities")) {
 913                         printf("fetch\n");
 914                         printf("option\n");
 915                         printf("push\n");
 916                         printf("\n");
 917                         fflush(stdout);
 918                 } else {
 919                         fprintf(stderr, "Unknown command '%s'\n", buf.buf);
 920                         return 1;
 921                 }
 922                 strbuf_reset(&buf);
 923         } while (1);
 924
 925         http_cleanup();
 926
 927         return 0;
 928 }