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