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;
  13 static struct walker *walker;
  14
  15 struct options {
  16         int verbosity;
  17         unsigned long depth;
  18         unsigned progress : 1,
  19                 followtags : 1,
  20                 dry_run : 1,
  21                 thin : 1;
  22 };
  23 static struct options options;
  24
  25 static void init_walker(void)
  26 {
  27         if (!walker)
  28                 walker = get_http_walker(url, remote);
  29 }
  30
  31 static int set_option(const char *name, const char *value)
  32 {
  33         if (!strcmp(name, "verbosity")) {
  34                 char *end;
  35                 int v = strtol(value, &end, 10);
  36                 if (value == end || *end)
  37                         return -1;
  38                 options.verbosity = v;
  39                 return 0;
  40         }
  41         else if (!strcmp(name, "progress")) {
  42                 if (!strcmp(value, "true"))
  43                         options.progress = 1;
  44                 else if (!strcmp(value, "false"))
  45                         options.progress = 0;
  46                 else
  47                         return -1;
  48                 return 0;
  49         }
  50         else if (!strcmp(name, "depth")) {
  51                 char *end;
  52                 unsigned long v = strtoul(value, &end, 10);
  53                 if (value == end || *end)
  54                         return -1;
  55                 options.depth = v;
  56                 return 0;
  57         }
  58         else if (!strcmp(name, "followtags")) {
  59                 if (!strcmp(value, "true"))
  60                         options.followtags = 1;
  61                 else if (!strcmp(value, "false"))
  62                         options.followtags = 0;
  63                 else
  64                         return -1;
  65                 return 0;
  66         }
  67         else if (!strcmp(name, "dry-run")) {
  68                 if (!strcmp(value, "true"))
  69                         options.dry_run = 1;
  70                 else if (!strcmp(value, "false"))
  71                         options.dry_run = 0;
  72                 else
  73                         return -1;
  74                 return 0;
  75         }
  76         else {
  77                 return 1 /* unsupported */;
  78         }
  79 }
  80
  81 struct discovery {
  82         const char *service;
  83         char *buf_alloc;
  84         char *buf;
  85         size_t len;
  86         unsigned proto_git : 1;
  87 };
  88 static struct discovery *last_discovery;
  89
  90 static void free_discovery(struct discovery *d)
  91 {
  92         if (d) {
  93                 if (d == last_discovery)
  94                         last_discovery = NULL;
  95                 free(d->buf_alloc);
  96                 free(d);
  97         }
  98 }
  99
 100 static struct discovery* discover_refs(const char *service)
 101 {
 102         struct strbuf buffer = STRBUF_INIT;
 103         struct discovery *last = last_discovery;
 104         char *refs_url;
 105         int http_ret, is_http = 0, proto_git_candidate = 1;
 106
 107         if (last && !strcmp(service, last->service))
 108                 return last;
 109         free_discovery(last);
 110
 111         strbuf_addf(&buffer, "%s/info/refs", url);
 112         if (!prefixcmp(url, "http://") || !prefixcmp(url, "https://")) {
 113                 is_http = 1;
 114                 if (!strchr(url, '?'))
 115                         strbuf_addch(&buffer, '?');
 116                 else
 117                         strbuf_addch(&buffer, '&');
 118                 strbuf_addf(&buffer, "service=%s", service);
 119         }
 120         refs_url = strbuf_detach(&buffer, NULL);
 121
 122         init_walker();
 123         http_ret = http_get_strbuf(refs_url, &buffer, HTTP_NO_CACHE);
 124
 125         /* try again with "plain" url (no ? or & appended) */
 126         if (http_ret != HTTP_OK) {
 127                 free(refs_url);
 128                 strbuf_reset(&buffer);
 129
 130                 proto_git_candidate = 0;
 131                 strbuf_addf(&buffer, "%s/info/refs", url);
 132                 refs_url = strbuf_detach(&buffer, NULL);
 133
 134                 http_ret = http_get_strbuf(refs_url, &buffer, HTTP_NO_CACHE);
 135         }
 136
 137         switch (http_ret) {
 138         case HTTP_OK:
 139                 break;
 140         case HTTP_MISSING_TARGET:
 141                 die("%s not found: did you run git update-server-info on the"
 142                     " server?", refs_url);
 143         default:
 144                 http_error(refs_url, http_ret);
 145                 die("HTTP request failed");
 146         }
 147
 148         last= xcalloc(1, sizeof(*last_discovery));
 149         last->service = service;
 150         last->buf_alloc = strbuf_detach(&buffer, &last->len);
 151         last->buf = last->buf_alloc;
 152
 153         if (is_http && proto_git_candidate
 154                 && 5 <= last->len && last->buf[4] == '#') {
 155                 /* smart HTTP response; validate that the service
 156                  * pkt-line matches our request.
 157                  */
 158                 struct strbuf exp = STRBUF_INIT;
 159
 160                 if (packet_get_line(&buffer, &last->buf, &last->len) <= 0)
 161                         die("%s has invalid packet header", refs_url);
 162                 if (buffer.len && buffer.buf[buffer.len - 1] == '\n')
 163                         strbuf_setlen(&buffer, buffer.len - 1);
 164
 165                 strbuf_addf(&exp, "# service=%s", service);
 166                 if (strbuf_cmp(&exp, &buffer))
 167                         die("invalid server response; got '%s'", buffer.buf);
 168                 strbuf_release(&exp);
 169
 170                 /* The header can include additional metadata lines, up
 171                  * until a packet flush marker.  Ignore these now, but
 172                  * in the future we might start to scan them.
 173                  */
 174                 strbuf_reset(&buffer);
 175                 while (packet_get_line(&buffer, &last->buf, &last->len) > 0)
 176                         strbuf_reset(&buffer);
 177
 178                 last->proto_git = 1;
 179         }
 180
 181         free(refs_url);
 182         strbuf_release(&buffer);
 183         last_discovery = last;
 184         return last;
 185 }
 186
 187 static int write_discovery(int in, int out, void *data)
 188 {
 189         struct discovery *heads = data;
 190         int err = 0;
 191         if (write_in_full(out, heads->buf, heads->len) != heads->len)
 192                 err = 1;
 193         close(out);
 194         return err;
 195 }
 196
 197 static struct ref *parse_git_refs(struct discovery *heads)
 198 {
 199         struct ref *list = NULL;
 200         struct async async;
 201
 202         memset(&async, 0, sizeof(async));
 203         async.proc = write_discovery;
 204         async.data = heads;
 205         async.out = -1;
 206
 207         if (start_async(&async))
 208                 die("cannot start thread to parse advertised refs");
 209         get_remote_heads(async.out, &list, 0, NULL, 0, NULL);
 210         close(async.out);
 211         if (finish_async(&async))
 212                 die("ref parsing thread failed");
 213         return list;
 214 }
 215
 216 static struct ref *parse_info_refs(struct discovery *heads)
 217 {
 218         char *data, *start, *mid;
 219         char *ref_name;
 220         int i = 0;
 221
 222         struct ref *refs = NULL;
 223         struct ref *ref = NULL;
 224         struct ref *last_ref = NULL;
 225
 226         data = heads->buf;
 227         start = NULL;
 228         mid = data;
 229         while (i < heads->len) {
 230                 if (!start) {
 231                         start = &data[i];
 232                 }
 233                 if (data[i] == '\t')
 234                         mid = &data[i];
 235                 if (data[i] == '\n') {
 236                         data[i] = 0;
 237                         ref_name = mid + 1;
 238                         ref = xmalloc(sizeof(struct ref) +
 239                                       strlen(ref_name) + 1);
 240                         memset(ref, 0, sizeof(struct ref));
 241                         strcpy(ref->name, ref_name);
 242                         get_sha1_hex(start, ref->old_sha1);
 243                         if (!refs)
 244                                 refs = ref;
 245                         if (last_ref)
 246                                 last_ref->next = ref;
 247                         last_ref = ref;
 248                         start = NULL;
 249                 }
 250                 i++;
 251         }
 252
 253         init_walker();
 254         ref = alloc_ref("HEAD");
 255         if (!walker->fetch_ref(walker, ref) &&
 256             !resolve_remote_symref(ref, refs)) {
 257                 ref->next = refs;
 258                 refs = ref;
 259         } else {
 260                 free(ref);
 261         }
 262
 263         return refs;
 264 }
 265
 266 static struct ref *get_refs(int for_push)
 267 {
 268         struct discovery *heads;
 269
 270         if (for_push)
 271                 heads = discover_refs("git-receive-pack");
 272         else
 273                 heads = discover_refs("git-upload-pack");
 274
 275         if (heads->proto_git)
 276                 return parse_git_refs(heads);
 277         return parse_info_refs(heads);
 278 }
 279
 280 static void output_refs(struct ref *refs)
 281 {
 282         struct ref *posn;
 283         for (posn = refs; posn; posn = posn->next) {
 284                 if (posn->symref)
 285                         printf("@%s %s\n", posn->symref, posn->name);
 286                 else
 287                         printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 288         }
 289         printf("\n");
 290         fflush(stdout);
 291         free_refs(refs);
 292 }
 293
 294 struct rpc_state {
 295         const char *service_name;
 296         const char **argv;
 297         char *service_url;
 298         char *hdr_content_type;
 299         char *hdr_accept;
 300         char *buf;
 301         size_t alloc;
 302         size_t len;
 303         size_t pos;
 304         int in;
 305         int out;
 306         struct strbuf result;
 307         unsigned gzip_request : 1;
 308 };
 309
 310 static size_t rpc_out(void *ptr, size_t eltsize,
 311                 size_t nmemb, void *buffer_)
 312 {
 313         size_t max = eltsize * nmemb;
 314         struct rpc_state *rpc = buffer_;
 315         size_t avail = rpc->len - rpc->pos;
 316
 317         if (!avail) {
 318                 avail = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
 319                 if (!avail)
 320                         return 0;
 321                 rpc->pos = 0;
 322                 rpc->len = avail;
 323         }
 324
 325         if (max < avail)
 326                 avail = max;
 327         memcpy(ptr, rpc->buf + rpc->pos, avail);
 328         rpc->pos += avail;
 329         return avail;
 330 }
 331
 332 static size_t rpc_in(const void *ptr, size_t eltsize,
 333                 size_t nmemb, void *buffer_)
 334 {
 335         size_t size = eltsize * nmemb;
 336         struct rpc_state *rpc = buffer_;
 337         write_or_die(rpc->in, ptr, size);
 338         return size;
 339 }
 340
 341 static int post_rpc(struct rpc_state *rpc)
 342 {
 343         struct active_request_slot *slot;
 344         struct slot_results results;
 345         struct curl_slist *headers = NULL;
 346         int use_gzip = rpc->gzip_request;
 347         char *gzip_body = NULL;
 348         int err = 0, large_request = 0;
 349
 350         /* Try to load the entire request, if we can fit it into the
 351          * allocated buffer space we can use HTTP/1.0 and avoid the
 352          * chunked encoding mess.
 353          */
 354         while (1) {
 355                 size_t left = rpc->alloc - rpc->len;
 356                 char *buf = rpc->buf + rpc->len;
 357                 int n;
 358
 359                 if (left < LARGE_PACKET_MAX) {
 360                         large_request = 1;
 361                         use_gzip = 0;
 362                         break;
 363                 }
 364
 365                 n = packet_read_line(rpc->out, buf, left);
 366                 if (!n)
 367                         break;
 368                 rpc->len += n;
 369         }
 370
 371         slot = get_active_slot();
 372         slot->results = &results;
 373
 374         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 375         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 376         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 377         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 378
 379         headers = curl_slist_append(headers, rpc->hdr_content_type);
 380         headers = curl_slist_append(headers, rpc->hdr_accept);
 381
 382         if (large_request) {
 383                 /* The request body is large and the size cannot be predicted.
 384                  * We must use chunked encoding to send it.
 385                  */
 386                 headers = curl_slist_append(headers, "Expect: 100-continue");
 387                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 388                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 389                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 390                 if (options.verbosity > 1) {
 391                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 392                         fflush(stderr);
 393                 }
 394
 395         } else if (use_gzip && 1024 < rpc->len) {
 396                 /* The client backend isn't giving us compressed data so
 397                  * we can try to deflate it ourselves, this may save on.
 398                  * the transfer time.
 399                  */
 400                 size_t size;
 401                 z_stream stream;
 402                 int ret;
 403
 404                 memset(&stream, 0, sizeof(stream));
 405                 ret = deflateInit2(&stream, Z_BEST_COMPRESSION,
 406                                 Z_DEFLATED, (15 + 16),
 407                                 8, Z_DEFAULT_STRATEGY);
 408                 if (ret != Z_OK)
 409                         die("cannot deflate request; zlib init error %d", ret);
 410                 size = deflateBound(&stream, rpc->len);
 411                 gzip_body = xmalloc(size);
 412
 413                 stream.next_in = (unsigned char *)rpc->buf;
 414                 stream.avail_in = rpc->len;
 415                 stream.next_out = (unsigned char *)gzip_body;
 416                 stream.avail_out = size;
 417
 418                 ret = deflate(&stream, Z_FINISH);
 419                 if (ret != Z_STREAM_END)
 420                         die("cannot deflate request; zlib deflate error %d", ret);
 421
 422                 ret = deflateEnd(&stream);
 423                 if (ret != Z_OK)
 424                         die("cannot deflate request; zlib end error %d", ret);
 425
 426                 size = stream.total_out;
 427
 428                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 429                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 430                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, size);
 431
 432                 if (options.verbosity > 1) {
 433                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 434                                 rpc->service_name,
 435                                 (unsigned long)rpc->len, (unsigned long)size);
 436                         fflush(stderr);
 437                 }
 438         } else {
 439                 /* We know the complete request size in advance, use the
 440                  * more normal Content-Length approach.
 441                  */
 442                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 443                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 444                 if (options.verbosity > 1) {
 445                         fprintf(stderr, "POST %s (%lu bytes)\n",
 446                                 rpc->service_name, (unsigned long)rpc->len);
 447                         fflush(stderr);
 448                 }
 449         }
 450
 451         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 452         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 453         curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 454
 455         slot->curl_result = curl_easy_perform(slot->curl);
 456         finish_active_slot(slot);
 457
 458         if (results.curl_result != CURLE_OK) {
 459                 err |= error("RPC failed; result=%d, HTTP code = %ld",
 460                         results.curl_result, results.http_code);
 461         }
 462
 463         curl_slist_free_all(headers);
 464         free(gzip_body);
 465         return err;
 466 }
 467
 468 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 469 {
 470         const char *svc = rpc->service_name;
 471         struct strbuf buf = STRBUF_INIT;
 472         struct child_process client;
 473         int err = 0;
 474
 475         init_walker();
 476         memset(&client, 0, sizeof(client));
 477         client.in = -1;
 478         client.out = -1;
 479         client.git_cmd = 1;
 480         client.argv = rpc->argv;
 481         if (start_command(&client))
 482                 exit(1);
 483         if (heads)
 484                 write_or_die(client.in, heads->buf, heads->len);
 485
 486         rpc->alloc = http_post_buffer;
 487         rpc->buf = xmalloc(rpc->alloc);
 488         rpc->in = client.in;
 489         rpc->out = client.out;
 490         strbuf_init(&rpc->result, 0);
 491
 492         strbuf_addf(&buf, "%s/%s", url, svc);
 493         rpc->service_url = strbuf_detach(&buf, NULL);
 494
 495         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 496         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 497
 498         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 499         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 500
 501         while (!err) {
 502                 int n = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
 503                 if (!n)
 504                         break;
 505                 rpc->pos = 0;
 506                 rpc->len = n;
 507                 err |= post_rpc(rpc);
 508         }
 509         strbuf_read(&rpc->result, client.out, 0);
 510
 511         close(client.in);
 512         close(client.out);
 513         client.in = -1;
 514         client.out = -1;
 515
 516         err |= finish_command(&client);
 517         free(rpc->service_url);
 518         free(rpc->hdr_content_type);
 519         free(rpc->hdr_accept);
 520         free(rpc->buf);
 521         strbuf_release(&buf);
 522         return err;
 523 }
 524
 525 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 526 {
 527         char **targets = xmalloc(nr_heads * sizeof(char*));
 528         int ret, i;
 529
 530         if (options.depth)
 531                 die("dumb http transport does not support --depth");
 532         for (i = 0; i < nr_heads; i++)
 533                 targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 534
 535         init_walker();
 536         walker->get_all = 1;
 537         walker->get_tree = 1;
 538         walker->get_history = 1;
 539         walker->get_verbosely = options.verbosity >= 3;
 540         walker->get_recover = 0;
 541         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 542
 543         for (i = 0; i < nr_heads; i++)
 544                 free(targets[i]);
 545         free(targets);
 546
 547         return ret ? error("Fetch failed.") : 0;
 548 }
 549
 550 static int fetch_git(struct discovery *heads,
 551         int nr_heads, struct ref **to_fetch)
 552 {
 553         struct rpc_state rpc;
 554         char *depth_arg = NULL;
 555         const char **argv;
 556         int argc = 0, i, err;
 557
 558         argv = xmalloc((15 + nr_heads) * sizeof(char*));
 559         argv[argc++] = "fetch-pack";
 560         argv[argc++] = "--stateless-rpc";
 561         argv[argc++] = "--lock-pack";
 562         if (options.followtags)
 563                 argv[argc++] = "--include-tag";
 564         if (options.thin)
 565                 argv[argc++] = "--thin";
 566         if (options.verbosity >= 3) {
 567                 argv[argc++] = "-v";
 568                 argv[argc++] = "-v";
 569         }
 570         if (!options.progress)
 571                 argv[argc++] = "--no-progress";
 572         if (options.depth) {
 573                 struct strbuf buf = STRBUF_INIT;
 574                 strbuf_addf(&buf, "--depth=%lu", options.depth);
 575                 depth_arg = strbuf_detach(&buf, NULL);
 576                 argv[argc++] = depth_arg;
 577         }
 578         argv[argc++] = url;
 579         for (i = 0; i < nr_heads; i++) {
 580                 struct ref *ref = to_fetch[i];
 581                 if (!ref->name || !*ref->name)
 582                         die("cannot fetch by sha1 over smart http");
 583                 argv[argc++] = ref->name;
 584         }
 585         argv[argc++] = NULL;
 586
 587         memset(&rpc, 0, sizeof(rpc));
 588         rpc.service_name = "git-upload-pack",
 589         rpc.argv = argv;
 590         rpc.gzip_request = 1;
 591
 592         err = rpc_service(&rpc, heads);
 593         if (rpc.result.len)
 594                 safe_write(1, rpc.result.buf, rpc.result.len);
 595         strbuf_release(&rpc.result);
 596         free(argv);
 597         free(depth_arg);
 598         return err;
 599 }
 600
 601 static int fetch(int nr_heads, struct ref **to_fetch)
 602 {
 603         struct discovery *d = discover_refs("git-upload-pack");
 604         if (d->proto_git)
 605                 return fetch_git(d, nr_heads, to_fetch);
 606         else
 607                 return fetch_dumb(nr_heads, to_fetch);
 608 }
 609
 610 static void parse_fetch(struct strbuf *buf)
 611 {
 612         struct ref **to_fetch = NULL;
 613         struct ref *list_head = NULL;
 614         struct ref **list = &list_head;
 615         int alloc_heads = 0, nr_heads = 0;
 616
 617         do {
 618                 if (!prefixcmp(buf->buf, "fetch ")) {
 619                         char *p = buf->buf + strlen("fetch ");
 620                         char *name;
 621                         struct ref *ref;
 622                         unsigned char old_sha1[20];
 623
 624                         if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 625                                 die("protocol error: expected sha/ref, got %s'", p);
 626                         if (p[40] == ' ')
 627                                 name = p + 41;
 628                         else if (!p[40])
 629                                 name = "";
 630                         else
 631                                 die("protocol error: expected sha/ref, got %s'", p);
 632
 633                         ref = alloc_ref(name);
 634                         hashcpy(ref->old_sha1, old_sha1);
 635
 636                         *list = ref;
 637                         list = &ref->next;
 638
 639                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 640                         to_fetch[nr_heads++] = ref;
 641                 }
 642                 else
 643                         die("http transport does not support %s", buf->buf);
 644
 645                 strbuf_reset(buf);
 646                 if (strbuf_getline(buf, stdin, '\n') == EOF)
 647                         return;
 648                 if (!*buf->buf)
 649                         break;
 650         } while (1);
 651
 652         if (fetch(nr_heads, to_fetch))
 653                 exit(128); /* error already reported */
 654         free_refs(list_head);
 655         free(to_fetch);
 656
 657         printf("\n");
 658         fflush(stdout);
 659         strbuf_reset(buf);
 660 }
 661
 662 static int push_dav(int nr_spec, char **specs)
 663 {
 664         const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 665         int argc = 0, i;
 666
 667         argv[argc++] = "http-push";
 668         argv[argc++] = "--helper-status";
 669         if (options.dry_run)
 670                 argv[argc++] = "--dry-run";
 671         if (options.verbosity > 1)
 672                 argv[argc++] = "--verbose";
 673         argv[argc++] = url;
 674         for (i = 0; i < nr_spec; i++)
 675                 argv[argc++] = specs[i];
 676         argv[argc++] = NULL;
 677
 678         if (run_command_v_opt(argv, RUN_GIT_CMD))
 679                 die("git-%s failed", argv[0]);
 680         free(argv);
 681         return 0;
 682 }
 683
 684 static int push_git(struct discovery *heads, int nr_spec, char **specs)
 685 {
 686         struct rpc_state rpc;
 687         const char **argv;
 688         int argc = 0, i, err;
 689
 690         argv = xmalloc((10 + nr_spec) * sizeof(char*));
 691         argv[argc++] = "send-pack";
 692         argv[argc++] = "--stateless-rpc";
 693         argv[argc++] = "--helper-status";
 694         if (options.thin)
 695                 argv[argc++] = "--thin";
 696         if (options.dry_run)
 697                 argv[argc++] = "--dry-run";
 698         if (options.verbosity > 1)
 699                 argv[argc++] = "--verbose";
 700         argv[argc++] = url;
 701         for (i = 0; i < nr_spec; i++)
 702                 argv[argc++] = specs[i];
 703         argv[argc++] = NULL;
 704
 705         memset(&rpc, 0, sizeof(rpc));
 706         rpc.service_name = "git-receive-pack",
 707         rpc.argv = argv;
 708
 709         err = rpc_service(&rpc, heads);
 710         if (rpc.result.len)
 711                 safe_write(1, rpc.result.buf, rpc.result.len);
 712         strbuf_release(&rpc.result);
 713         free(argv);
 714         return err;
 715 }
 716
 717 static int push(int nr_spec, char **specs)
 718 {
 719         struct discovery *heads = discover_refs("git-receive-pack");
 720         int ret;
 721
 722         if (heads->proto_git)
 723                 ret = push_git(heads, nr_spec, specs);
 724         else
 725                 ret = push_dav(nr_spec, specs);
 726         free_discovery(heads);
 727         return ret;
 728 }
 729
 730 static void parse_push(struct strbuf *buf)
 731 {
 732         char **specs = NULL;
 733         int alloc_spec = 0, nr_spec = 0, i;
 734
 735         do {
 736                 if (!prefixcmp(buf->buf, "push ")) {
 737                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 738                         specs[nr_spec++] = xstrdup(buf->buf + 5);
 739                 }
 740                 else
 741                         die("http transport does not support %s", buf->buf);
 742
 743                 strbuf_reset(buf);
 744                 if (strbuf_getline(buf, stdin, '\n') == EOF)
 745                         return;
 746                 if (!*buf->buf)
 747                         break;
 748         } while (1);
 749
 750         if (push(nr_spec, specs))
 751                 exit(128); /* error already reported */
 752         for (i = 0; i < nr_spec; i++)
 753                 free(specs[i]);
 754         free(specs);
 755
 756         printf("\n");
 757         fflush(stdout);
 758 }
 759
 760 int main(int argc, const char **argv)
 761 {
 762         struct strbuf buf = STRBUF_INIT;
 763         int nongit;
 764
 765         git_extract_argv0_path(argv[0]);
 766         setup_git_directory_gently(&nongit);
 767         if (argc < 2) {
 768                 fprintf(stderr, "Remote needed\n");
 769                 return 1;
 770         }
 771
 772         options.verbosity = 1;
 773         options.progress = !!isatty(2);
 774         options.thin = 1;
 775
 776         remote = remote_get(argv[1]);
 777
 778         if (argc > 2) {
 779                 url = argv[2];
 780         } else {
 781                 url = remote->url[0];
 782         }
 783
 784         do {
 785                 if (strbuf_getline(&buf, stdin, '\n') == EOF)
 786                         break;
 787                 if (!prefixcmp(buf.buf, "fetch ")) {
 788                         if (nongit)
 789                                 die("Fetch attempted without a local repo");
 790                         parse_fetch(&buf);
 791
 792                 } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
 793                         int for_push = !!strstr(buf.buf + 4, "for-push");
 794                         output_refs(get_refs(for_push));
 795
 796                 } else if (!prefixcmp(buf.buf, "push ")) {
 797                         parse_push(&buf);
 798
 799                 } else if (!prefixcmp(buf.buf, "option ")) {
 800                         char *name = buf.buf + strlen("option ");
 801                         char *value = strchr(name, ' ');
 802                         int result;
 803
 804                         if (value)
 805                                 *value++ = '\0';
 806                         else
 807                                 value = "true";
 808
 809                         result = set_option(name, value);
 810                         if (!result)
 811                                 printf("ok\n");
 812                         else if (result < 0)
 813                                 printf("error invalid value\n");
 814                         else
 815                                 printf("unsupported\n");
 816                         fflush(stdout);
 817
 818                 } else if (!strcmp(buf.buf, "capabilities")) {
 819                         printf("fetch\n");
 820                         printf("option\n");
 821                         printf("push\n");
 822                         printf("\n");
 823                         fflush(stdout);
 824                 } else {
 825                         return 1;
 826                 }
 827                 strbuf_reset(&buf);
 828         } while (1);
 829         return 0;
 830 }