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         struct strbuf *stdin_preamble;
 294         char *service_url;
 295         char *hdr_content_type;
 296         char *hdr_accept;
 297         char *buf;
 298         size_t alloc;
 299         size_t len;
 300         size_t pos;
 301         int in;
 302         int out;
 303         struct strbuf result;
 304         unsigned gzip_request : 1;
 305         unsigned initial_buffer : 1;
 306 };
 307
 308 static size_t rpc_out(void *ptr, size_t eltsize,
 309                 size_t nmemb, void *buffer_)
 310 {
 311         size_t max = eltsize * nmemb;
 312         struct rpc_state *rpc = buffer_;
 313         size_t avail = rpc->len - rpc->pos;
 314
 315         if (!avail) {
 316                 rpc->initial_buffer = 0;
 317                 avail = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
 318                 if (!avail)
 319                         return 0;
 320                 rpc->pos = 0;
 321                 rpc->len = avail;
 322         }
 323
 324         if (max < avail)
 325                 avail = max;
 326         memcpy(ptr, rpc->buf + rpc->pos, avail);
 327         rpc->pos += avail;
 328         return avail;
 329 }
 330
 331 #ifndef NO_CURL_IOCTL
 332 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 333 {
 334         struct rpc_state *rpc = clientp;
 335
 336         switch (cmd) {
 337         case CURLIOCMD_NOP:
 338                 return CURLIOE_OK;
 339
 340         case CURLIOCMD_RESTARTREAD:
 341                 if (rpc->initial_buffer) {
 342                         rpc->pos = 0;
 343                         return CURLIOE_OK;
 344                 }
 345                 fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
 346                 return CURLIOE_FAILRESTART;
 347
 348         default:
 349                 return CURLIOE_UNKNOWNCMD;
 350         }
 351 }
 352 #endif
 353
 354 static size_t rpc_in(char *ptr, size_t eltsize,
 355                 size_t nmemb, void *buffer_)
 356 {
 357         size_t size = eltsize * nmemb;
 358         struct rpc_state *rpc = buffer_;
 359         write_or_die(rpc->in, ptr, size);
 360         return size;
 361 }
 362
 363 static int run_slot(struct active_request_slot *slot)
 364 {
 365         int err = 0;
 366         struct slot_results results;
 367
 368         slot->results = &results;
 369         slot->curl_result = curl_easy_perform(slot->curl);
 370         finish_active_slot(slot);
 371
 372         if (results.curl_result != CURLE_OK) {
 373                 err |= error("RPC failed; result=%d, HTTP code = %ld",
 374                         results.curl_result, results.http_code);
 375         }
 376
 377         return err;
 378 }
 379
 380 static int probe_rpc(struct rpc_state *rpc)
 381 {
 382         struct active_request_slot *slot;
 383         struct curl_slist *headers = NULL;
 384         struct strbuf buf = STRBUF_INIT;
 385         int err;
 386
 387         slot = get_active_slot();
 388
 389         headers = curl_slist_append(headers, rpc->hdr_content_type);
 390         headers = curl_slist_append(headers, rpc->hdr_accept);
 391
 392         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 393         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 394         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 395         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 396         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 397         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 398         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 399         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 400         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 401
 402         err = run_slot(slot);
 403
 404         curl_slist_free_all(headers);
 405         strbuf_release(&buf);
 406         return err;
 407 }
 408
 409 static int post_rpc(struct rpc_state *rpc)
 410 {
 411         struct active_request_slot *slot;
 412         struct curl_slist *headers = NULL;
 413         int use_gzip = rpc->gzip_request;
 414         char *gzip_body = NULL;
 415         int err, large_request = 0;
 416
 417         /* Try to load the entire request, if we can fit it into the
 418          * allocated buffer space we can use HTTP/1.0 and avoid the
 419          * chunked encoding mess.
 420          */
 421         while (1) {
 422                 size_t left = rpc->alloc - rpc->len;
 423                 char *buf = rpc->buf + rpc->len;
 424                 int n;
 425
 426                 if (left < LARGE_PACKET_MAX) {
 427                         large_request = 1;
 428                         use_gzip = 0;
 429                         break;
 430                 }
 431
 432                 n = packet_read_line(rpc->out, buf, left);
 433                 if (!n)
 434                         break;
 435                 rpc->len += n;
 436         }
 437
 438         if (large_request) {
 439                 err = probe_rpc(rpc);
 440                 if (err)
 441                         return err;
 442         }
 443
 444         slot = get_active_slot();
 445
 446         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 447         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 448         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 449         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 450
 451         headers = curl_slist_append(headers, rpc->hdr_content_type);
 452         headers = curl_slist_append(headers, rpc->hdr_accept);
 453         headers = curl_slist_append(headers, "Expect:");
 454
 455         if (large_request) {
 456                 /* The request body is large and the size cannot be predicted.
 457                  * We must use chunked encoding to send it.
 458                  */
 459                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 460                 rpc->initial_buffer = 1;
 461                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 462                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 463 #ifndef NO_CURL_IOCTL
 464                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 465                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 466 #endif
 467                 if (options.verbosity > 1) {
 468                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 469                         fflush(stderr);
 470                 }
 471
 472         } else if (use_gzip && 1024 < rpc->len) {
 473                 /* The client backend isn't giving us compressed data so
 474                  * we can try to deflate it ourselves, this may save on.
 475                  * the transfer time.
 476                  */
 477                 size_t size;
 478                 git_zstream stream;
 479                 int ret;
 480
 481                 memset(&stream, 0, sizeof(stream));
 482                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 483                 size = git_deflate_bound(&stream, rpc->len);
 484                 gzip_body = xmalloc(size);
 485
 486                 stream.next_in = (unsigned char *)rpc->buf;
 487                 stream.avail_in = rpc->len;
 488                 stream.next_out = (unsigned char *)gzip_body;
 489                 stream.avail_out = size;
 490
 491                 ret = git_deflate(&stream, Z_FINISH);
 492                 if (ret != Z_STREAM_END)
 493                         die("cannot deflate request; zlib deflate error %d", ret);
 494
 495                 ret = git_deflate_end_gently(&stream);
 496                 if (ret != Z_OK)
 497                         die("cannot deflate request; zlib end error %d", ret);
 498
 499                 size = stream.total_out;
 500
 501                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 502                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 503                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, size);
 504
 505                 if (options.verbosity > 1) {
 506                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 507                                 rpc->service_name,
 508                                 (unsigned long)rpc->len, (unsigned long)size);
 509                         fflush(stderr);
 510                 }
 511         } else {
 512                 /* We know the complete request size in advance, use the
 513                  * more normal Content-Length approach.
 514                  */
 515                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 516                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 517                 if (options.verbosity > 1) {
 518                         fprintf(stderr, "POST %s (%lu bytes)\n",
 519                                 rpc->service_name, (unsigned long)rpc->len);
 520                         fflush(stderr);
 521                 }
 522         }
 523
 524         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 525         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 526         curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 527
 528         err = run_slot(slot);
 529
 530         curl_slist_free_all(headers);
 531         free(gzip_body);
 532         return err;
 533 }
 534
 535 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 536 {
 537         const char *svc = rpc->service_name;
 538         struct strbuf buf = STRBUF_INIT;
 539         struct strbuf *preamble = rpc->stdin_preamble;
 540         struct child_process client;
 541         int err = 0;
 542
 543         memset(&client, 0, sizeof(client));
 544         client.in = -1;
 545         client.out = -1;
 546         client.git_cmd = 1;
 547         client.argv = rpc->argv;
 548         if (start_command(&client))
 549                 exit(1);
 550         if (preamble)
 551                 write_or_die(client.in, preamble->buf, preamble->len);
 552         if (heads)
 553                 write_or_die(client.in, heads->buf, heads->len);
 554
 555         rpc->alloc = http_post_buffer;
 556         rpc->buf = xmalloc(rpc->alloc);
 557         rpc->in = client.in;
 558         rpc->out = client.out;
 559         strbuf_init(&rpc->result, 0);
 560
 561         strbuf_addf(&buf, "%s%s", url, svc);
 562         rpc->service_url = strbuf_detach(&buf, NULL);
 563
 564         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 565         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 566
 567         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 568         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 569
 570         while (!err) {
 571                 int n = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
 572                 if (!n)
 573                         break;
 574                 rpc->pos = 0;
 575                 rpc->len = n;
 576                 err |= post_rpc(rpc);
 577         }
 578
 579         close(client.in);
 580         client.in = -1;
 581         if (!err) {
 582                 strbuf_read(&rpc->result, client.out, 0);
 583         } else {
 584                 char buf[4096];
 585                 for (;;)
 586                         if (xread(client.out, buf, sizeof(buf)) <= 0)
 587                                 break;
 588         }
 589
 590         close(client.out);
 591         client.out = -1;
 592
 593         err |= finish_command(&client);
 594         free(rpc->service_url);
 595         free(rpc->hdr_content_type);
 596         free(rpc->hdr_accept);
 597         free(rpc->buf);
 598         strbuf_release(&buf);
 599         return err;
 600 }
 601
 602 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 603 {
 604         struct walker *walker;
 605         char **targets = xmalloc(nr_heads * sizeof(char*));
 606         int ret, i;
 607
 608         if (options.depth)
 609                 die("dumb http transport does not support --depth");
 610         for (i = 0; i < nr_heads; i++)
 611                 targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 612
 613         walker = get_http_walker(url);
 614         walker->get_all = 1;
 615         walker->get_tree = 1;
 616         walker->get_history = 1;
 617         walker->get_verbosely = options.verbosity >= 3;
 618         walker->get_recover = 0;
 619         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 620         walker_free(walker);
 621
 622         for (i = 0; i < nr_heads; i++)
 623                 free(targets[i]);
 624         free(targets);
 625
 626         return ret ? error("Fetch failed.") : 0;
 627 }
 628
 629 static int fetch_git(struct discovery *heads,
 630         int nr_heads, struct ref **to_fetch)
 631 {
 632         struct rpc_state rpc;
 633         struct strbuf preamble = STRBUF_INIT;
 634         char *depth_arg = NULL;
 635         int argc = 0, i, err;
 636         const char *argv[15];
 637
 638         argv[argc++] = "fetch-pack";
 639         argv[argc++] = "--stateless-rpc";
 640         argv[argc++] = "--stdin";
 641         argv[argc++] = "--lock-pack";
 642         if (options.followtags)
 643                 argv[argc++] = "--include-tag";
 644         if (options.thin)
 645                 argv[argc++] = "--thin";
 646         if (options.verbosity >= 3) {
 647                 argv[argc++] = "-v";
 648                 argv[argc++] = "-v";
 649         }
 650         if (!options.progress)
 651                 argv[argc++] = "--no-progress";
 652         if (options.depth) {
 653                 struct strbuf buf = STRBUF_INIT;
 654                 strbuf_addf(&buf, "--depth=%lu", options.depth);
 655                 depth_arg = strbuf_detach(&buf, NULL);
 656                 argv[argc++] = depth_arg;
 657         }
 658         argv[argc++] = url;
 659         argv[argc++] = NULL;
 660
 661         for (i = 0; i < nr_heads; i++) {
 662                 struct ref *ref = to_fetch[i];
 663                 if (!ref->name || !*ref->name)
 664                         die("cannot fetch by sha1 over smart http");
 665                 packet_buf_write(&preamble, "%s\n", ref->name);
 666         }
 667         packet_buf_flush(&preamble);
 668
 669         memset(&rpc, 0, sizeof(rpc));
 670         rpc.service_name = "git-upload-pack",
 671         rpc.argv = argv;
 672         rpc.stdin_preamble = &preamble;
 673         rpc.gzip_request = 1;
 674
 675         err = rpc_service(&rpc, heads);
 676         if (rpc.result.len)
 677                 safe_write(1, rpc.result.buf, rpc.result.len);
 678         strbuf_release(&rpc.result);
 679         strbuf_release(&preamble);
 680         free(depth_arg);
 681         return err;
 682 }
 683
 684 static int fetch(int nr_heads, struct ref **to_fetch)
 685 {
 686         struct discovery *d = discover_refs("git-upload-pack");
 687         if (d->proto_git)
 688                 return fetch_git(d, nr_heads, to_fetch);
 689         else
 690                 return fetch_dumb(nr_heads, to_fetch);
 691 }
 692
 693 static void parse_fetch(struct strbuf *buf)
 694 {
 695         struct ref **to_fetch = NULL;
 696         struct ref *list_head = NULL;
 697         struct ref **list = &list_head;
 698         int alloc_heads = 0, nr_heads = 0;
 699
 700         do {
 701                 if (!prefixcmp(buf->buf, "fetch ")) {
 702                         char *p = buf->buf + strlen("fetch ");
 703                         char *name;
 704                         struct ref *ref;
 705                         unsigned char old_sha1[20];
 706
 707                         if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 708                                 die("protocol error: expected sha/ref, got %s'", p);
 709                         if (p[40] == ' ')
 710                                 name = p + 41;
 711                         else if (!p[40])
 712                                 name = "";
 713                         else
 714                                 die("protocol error: expected sha/ref, got %s'", p);
 715
 716                         ref = alloc_ref(name);
 717                         hashcpy(ref->old_sha1, old_sha1);
 718
 719                         *list = ref;
 720                         list = &ref->next;
 721
 722                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 723                         to_fetch[nr_heads++] = ref;
 724                 }
 725                 else
 726                         die("http transport does not support %s", buf->buf);
 727
 728                 strbuf_reset(buf);
 729                 if (strbuf_getline(buf, stdin, '\n') == EOF)
 730                         return;
 731                 if (!*buf->buf)
 732                         break;
 733         } while (1);
 734
 735         if (fetch(nr_heads, to_fetch))
 736                 exit(128); /* error already reported */
 737         free_refs(list_head);
 738         free(to_fetch);
 739
 740         printf("\n");
 741         fflush(stdout);
 742         strbuf_reset(buf);
 743 }
 744
 745 static int push_dav(int nr_spec, char **specs)
 746 {
 747         const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 748         int argc = 0, i;
 749
 750         argv[argc++] = "http-push";
 751         argv[argc++] = "--helper-status";
 752         if (options.dry_run)
 753                 argv[argc++] = "--dry-run";
 754         if (options.verbosity > 1)
 755                 argv[argc++] = "--verbose";
 756         argv[argc++] = url;
 757         for (i = 0; i < nr_spec; i++)
 758                 argv[argc++] = specs[i];
 759         argv[argc++] = NULL;
 760
 761         if (run_command_v_opt(argv, RUN_GIT_CMD))
 762                 die("git-%s failed", argv[0]);
 763         free(argv);
 764         return 0;
 765 }
 766
 767 static int push_git(struct discovery *heads, int nr_spec, char **specs)
 768 {
 769         struct rpc_state rpc;
 770         const char **argv;
 771         int argc = 0, i, err;
 772
 773         argv = xmalloc((10 + nr_spec) * sizeof(char*));
 774         argv[argc++] = "send-pack";
 775         argv[argc++] = "--stateless-rpc";
 776         argv[argc++] = "--helper-status";
 777         if (options.thin)
 778                 argv[argc++] = "--thin";
 779         if (options.dry_run)
 780                 argv[argc++] = "--dry-run";
 781         if (options.verbosity > 1)
 782                 argv[argc++] = "--verbose";
 783         argv[argc++] = url;
 784         for (i = 0; i < nr_spec; i++)
 785                 argv[argc++] = specs[i];
 786         argv[argc++] = NULL;
 787
 788         memset(&rpc, 0, sizeof(rpc));
 789         rpc.service_name = "git-receive-pack",
 790         rpc.argv = argv;
 791
 792         err = rpc_service(&rpc, heads);
 793         if (rpc.result.len)
 794                 safe_write(1, rpc.result.buf, rpc.result.len);
 795         strbuf_release(&rpc.result);
 796         free(argv);
 797         return err;
 798 }
 799
 800 static int push(int nr_spec, char **specs)
 801 {
 802         struct discovery *heads = discover_refs("git-receive-pack");
 803         int ret;
 804
 805         if (heads->proto_git)
 806                 ret = push_git(heads, nr_spec, specs);
 807         else
 808                 ret = push_dav(nr_spec, specs);
 809         free_discovery(heads);
 810         return ret;
 811 }
 812
 813 static void parse_push(struct strbuf *buf)
 814 {
 815         char **specs = NULL;
 816         int alloc_spec = 0, nr_spec = 0, i;
 817
 818         do {
 819                 if (!prefixcmp(buf->buf, "push ")) {
 820                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 821                         specs[nr_spec++] = xstrdup(buf->buf + 5);
 822                 }
 823                 else
 824                         die("http transport does not support %s", buf->buf);
 825
 826                 strbuf_reset(buf);
 827                 if (strbuf_getline(buf, stdin, '\n') == EOF)
 828                         goto free_specs;
 829                 if (!*buf->buf)
 830                         break;
 831         } while (1);
 832
 833         if (push(nr_spec, specs))
 834                 exit(128); /* error already reported */
 835
 836         printf("\n");
 837         fflush(stdout);
 838
 839  free_specs:
 840         for (i = 0; i < nr_spec; i++)
 841                 free(specs[i]);
 842         free(specs);
 843 }
 844
 845 int main(int argc, const char **argv)
 846 {
 847         struct strbuf buf = STRBUF_INIT;
 848         int nongit;
 849
 850         git_extract_argv0_path(argv[0]);
 851         setup_git_directory_gently(&nongit);
 852         if (argc < 2) {
 853                 fprintf(stderr, "Remote needed\n");
 854                 return 1;
 855         }
 856
 857         options.verbosity = 1;
 858         options.progress = !!isatty(2);
 859         options.thin = 1;
 860
 861         remote = remote_get(argv[1]);
 862
 863         if (argc > 2) {
 864                 end_url_with_slash(&buf, argv[2]);
 865         } else {
 866                 end_url_with_slash(&buf, remote->url[0]);
 867         }
 868
 869         url = strbuf_detach(&buf, NULL);
 870
 871         http_init(remote, url, 0);
 872
 873         do {
 874                 if (strbuf_getline(&buf, stdin, '\n') == EOF) {
 875                         if (ferror(stdin))
 876                                 fprintf(stderr, "Error reading command stream\n");
 877                         else
 878                                 fprintf(stderr, "Unexpected end of command stream\n");
 879                         return 1;
 880                 }
 881                 if (buf.len == 0)
 882                         break;
 883                 if (!prefixcmp(buf.buf, "fetch ")) {
 884                         if (nongit)
 885                                 die("Fetch attempted without a local repo");
 886                         parse_fetch(&buf);
 887
 888                 } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
 889                         int for_push = !!strstr(buf.buf + 4, "for-push");
 890                         output_refs(get_refs(for_push));
 891
 892                 } else if (!prefixcmp(buf.buf, "push ")) {
 893                         parse_push(&buf);
 894
 895                 } else if (!prefixcmp(buf.buf, "option ")) {
 896                         char *name = buf.buf + strlen("option ");
 897                         char *value = strchr(name, ' ');
 898                         int result;
 899
 900                         if (value)
 901                                 *value++ = '\0';
 902                         else
 903                                 value = "true";
 904
 905                         result = set_option(name, value);
 906                         if (!result)
 907                                 printf("ok\n");
 908                         else if (result < 0)
 909                                 printf("error invalid value\n");
 910                         else
 911                                 printf("unsupported\n");
 912                         fflush(stdout);
 913
 914                 } else if (!strcmp(buf.buf, "capabilities")) {
 915                         printf("fetch\n");
 916                         printf("option\n");
 917                         printf("push\n");
 918                         printf("\n");
 919                         fflush(stdout);
 920                 } else {
 921                         fprintf(stderr, "Unknown command '%s'\n", buf.buf);
 922                         return 1;
 923                 }
 924                 strbuf_reset(&buf);
 925         } while (1);
 926
 927         http_cleanup();
 928
 929         return 0;
 930 }