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