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
  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, "%s/info/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) {
 119                 free(refs_url);
 120                 strbuf_reset(&buffer);
 121
 122                 proto_git_candidate = 0;
 123                 strbuf_addf(&buffer, "%s/info/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         default:
 136                 http_error(refs_url, http_ret);
 137                 die("HTTP request failed");
 138         }
 139
 140         last= xcalloc(1, sizeof(*last_discovery));
 141         last->service = service;
 142         last->buf_alloc = strbuf_detach(&buffer, &last->len);
 143         last->buf = last->buf_alloc;
 144
 145         if (is_http && proto_git_candidate
 146                 && 5 <= last->len && last->buf[4] == '#') {
 147                 /* smart HTTP response; validate that the service
 148                  * pkt-line matches our request.
 149                  */
 150                 struct strbuf exp = STRBUF_INIT;
 151
 152                 if (packet_get_line(&buffer, &last->buf, &last->len) <= 0)
 153                         die("%s has invalid packet header", refs_url);
 154                 if (buffer.len && buffer.buf[buffer.len - 1] == '\n')
 155                         strbuf_setlen(&buffer, buffer.len - 1);
 156
 157                 strbuf_addf(&exp, "# service=%s", service);
 158                 if (strbuf_cmp(&exp, &buffer))
 159                         die("invalid server response; got '%s'", buffer.buf);
 160                 strbuf_release(&exp);
 161
 162                 /* The header can include additional metadata lines, up
 163                  * until a packet flush marker.  Ignore these now, but
 164                  * in the future we might start to scan them.
 165                  */
 166                 strbuf_reset(&buffer);
 167                 while (packet_get_line(&buffer, &last->buf, &last->len) > 0)
 168                         strbuf_reset(&buffer);
 169
 170                 last->proto_git = 1;
 171         }
 172
 173         free(refs_url);
 174         strbuf_release(&buffer);
 175         last_discovery = last;
 176         return last;
 177 }
 178
 179 static int write_discovery(int fd, void *data)
 180 {
 181         struct discovery *heads = data;
 182         int err = 0;
 183         if (write_in_full(fd, heads->buf, heads->len) != heads->len)
 184                 err = 1;
 185         close(fd);
 186         return err;
 187 }
 188
 189 static struct ref *parse_git_refs(struct discovery *heads)
 190 {
 191         struct ref *list = NULL;
 192         struct async async;
 193
 194         memset(&async, 0, sizeof(async));
 195         async.proc = write_discovery;
 196         async.data = heads;
 197
 198         if (start_async(&async))
 199                 die("cannot start thread to parse advertised refs");
 200         get_remote_heads(async.out, &list, 0, NULL, 0, NULL);
 201         close(async.out);
 202         if (finish_async(&async))
 203                 die("ref parsing thread failed");
 204         return list;
 205 }
 206
 207 static struct ref *parse_info_refs(struct discovery *heads)
 208 {
 209         char *data, *start, *mid;
 210         char *ref_name;
 211         int i = 0;
 212
 213         struct ref *refs = NULL;
 214         struct ref *ref = NULL;
 215         struct ref *last_ref = NULL;
 216
 217         data = heads->buf;
 218         start = NULL;
 219         mid = data;
 220         while (i < heads->len) {
 221                 if (!start) {
 222                         start = &data[i];
 223                 }
 224                 if (data[i] == '\t')
 225                         mid = &data[i];
 226                 if (data[i] == '\n') {
 227                         data[i] = 0;
 228                         ref_name = mid + 1;
 229                         ref = xmalloc(sizeof(struct ref) +
 230                                       strlen(ref_name) + 1);
 231                         memset(ref, 0, sizeof(struct ref));
 232                         strcpy(ref->name, ref_name);
 233                         get_sha1_hex(start, ref->old_sha1);
 234                         if (!refs)
 235                                 refs = ref;
 236                         if (last_ref)
 237                                 last_ref->next = ref;
 238                         last_ref = ref;
 239                         start = NULL;
 240                 }
 241                 i++;
 242         }
 243
 244         ref = alloc_ref("HEAD");
 245         if (!http_fetch_ref(url, ref) &&
 246             !resolve_remote_symref(ref, refs)) {
 247                 ref->next = refs;
 248                 refs = ref;
 249         } else {
 250                 free(ref);
 251         }
 252
 253         return refs;
 254 }
 255
 256 static struct ref *get_refs(int for_push)
 257 {
 258         struct discovery *heads;
 259
 260         if (for_push)
 261                 heads = discover_refs("git-receive-pack");
 262         else
 263                 heads = discover_refs("git-upload-pack");
 264
 265         if (heads->proto_git)
 266                 return parse_git_refs(heads);
 267         return parse_info_refs(heads);
 268 }
 269
 270 static void output_refs(struct ref *refs)
 271 {
 272         struct ref *posn;
 273         for (posn = refs; posn; posn = posn->next) {
 274                 if (posn->symref)
 275                         printf("@%s %s\n", posn->symref, posn->name);
 276                 else
 277                         printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 278         }
 279         printf("\n");
 280         fflush(stdout);
 281         free_refs(refs);
 282 }
 283
 284 struct rpc_state {
 285         const char *service_name;
 286         const char **argv;
 287         char *service_url;
 288         char *hdr_content_type;
 289         char *hdr_accept;
 290         char *buf;
 291         size_t alloc;
 292         size_t len;
 293         size_t pos;
 294         int in;
 295         int out;
 296         struct strbuf result;
 297         unsigned gzip_request : 1;
 298         unsigned initial_buffer : 1;
 299 };
 300
 301 static size_t rpc_out(void *ptr, size_t eltsize,
 302                 size_t nmemb, void *buffer_)
 303 {
 304         size_t max = eltsize * nmemb;
 305         struct rpc_state *rpc = buffer_;
 306         size_t avail = rpc->len - rpc->pos;
 307
 308         if (!avail) {
 309                 rpc->initial_buffer = 0;
 310                 avail = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
 311                 if (!avail)
 312                         return 0;
 313                 rpc->pos = 0;
 314                 rpc->len = avail;
 315         }
 316
 317         if (max < avail)
 318                 avail = max;
 319         memcpy(ptr, rpc->buf + rpc->pos, avail);
 320         rpc->pos += avail;
 321         return avail;
 322 }
 323
 324 #ifndef NO_CURL_IOCTL
 325 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 326 {
 327         struct rpc_state *rpc = clientp;
 328
 329         switch (cmd) {
 330         case CURLIOCMD_NOP:
 331                 return CURLIOE_OK;
 332
 333         case CURLIOCMD_RESTARTREAD:
 334                 if (rpc->initial_buffer) {
 335                         rpc->pos = 0;
 336                         return CURLIOE_OK;
 337                 }
 338                 fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
 339                 return CURLIOE_FAILRESTART;
 340
 341         default:
 342                 return CURLIOE_UNKNOWNCMD;
 343         }
 344 }
 345 #endif
 346
 347 static size_t rpc_in(const void *ptr, size_t eltsize,
 348                 size_t nmemb, void *buffer_)
 349 {
 350         size_t size = eltsize * nmemb;
 351         struct rpc_state *rpc = buffer_;
 352         write_or_die(rpc->in, ptr, size);
 353         return size;
 354 }
 355
 356 static int post_rpc(struct rpc_state *rpc)
 357 {
 358         struct active_request_slot *slot;
 359         struct slot_results results;
 360         struct curl_slist *headers = NULL;
 361         int use_gzip = rpc->gzip_request;
 362         char *gzip_body = NULL;
 363         int err = 0, large_request = 0;
 364
 365         /* Try to load the entire request, if we can fit it into the
 366          * allocated buffer space we can use HTTP/1.0 and avoid the
 367          * chunked encoding mess.
 368          */
 369         while (1) {
 370                 size_t left = rpc->alloc - rpc->len;
 371                 char *buf = rpc->buf + rpc->len;
 372                 int n;
 373
 374                 if (left < LARGE_PACKET_MAX) {
 375                         large_request = 1;
 376                         use_gzip = 0;
 377                         break;
 378                 }
 379
 380                 n = packet_read_line(rpc->out, buf, left);
 381                 if (!n)
 382                         break;
 383                 rpc->len += n;
 384         }
 385
 386         slot = get_active_slot();
 387         slot->results = &results;
 388
 389         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 390         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 391         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 392         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 393
 394         headers = curl_slist_append(headers, rpc->hdr_content_type);
 395         headers = curl_slist_append(headers, rpc->hdr_accept);
 396
 397         if (large_request) {
 398                 /* The request body is large and the size cannot be predicted.
 399                  * We must use chunked encoding to send it.
 400                  */
 401                 headers = curl_slist_append(headers, "Expect: 100-continue");
 402                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 403                 rpc->initial_buffer = 1;
 404                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 405                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 406 #ifndef NO_CURL_IOCTL
 407                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 408                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 409 #endif
 410                 if (options.verbosity > 1) {
 411                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 412                         fflush(stderr);
 413                 }
 414
 415         } else if (use_gzip && 1024 < rpc->len) {
 416                 /* The client backend isn't giving us compressed data so
 417                  * we can try to deflate it ourselves, this may save on.
 418                  * the transfer time.
 419                  */
 420                 size_t size;
 421                 z_stream stream;
 422                 int ret;
 423
 424                 memset(&stream, 0, sizeof(stream));
 425                 ret = deflateInit2(&stream, Z_BEST_COMPRESSION,
 426                                 Z_DEFLATED, (15 + 16),
 427                                 8, Z_DEFAULT_STRATEGY);
 428                 if (ret != Z_OK)
 429                         die("cannot deflate request; zlib init error %d", ret);
 430                 size = deflateBound(&stream, rpc->len);
 431                 gzip_body = xmalloc(size);
 432
 433                 stream.next_in = (unsigned char *)rpc->buf;
 434                 stream.avail_in = rpc->len;
 435                 stream.next_out = (unsigned char *)gzip_body;
 436                 stream.avail_out = size;
 437
 438                 ret = deflate(&stream, Z_FINISH);
 439                 if (ret != Z_STREAM_END)
 440                         die("cannot deflate request; zlib deflate error %d", ret);
 441
 442                 ret = deflateEnd(&stream);
 443                 if (ret != Z_OK)
 444                         die("cannot deflate request; zlib end error %d", ret);
 445
 446                 size = stream.total_out;
 447
 448                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 449                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 450                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, size);
 451
 452                 if (options.verbosity > 1) {
 453                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 454                                 rpc->service_name,
 455                                 (unsigned long)rpc->len, (unsigned long)size);
 456                         fflush(stderr);
 457                 }
 458         } else {
 459                 /* We know the complete request size in advance, use the
 460                  * more normal Content-Length approach.
 461                  */
 462                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 463                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 464                 if (options.verbosity > 1) {
 465                         fprintf(stderr, "POST %s (%lu bytes)\n",
 466                                 rpc->service_name, (unsigned long)rpc->len);
 467                         fflush(stderr);
 468                 }
 469         }
 470
 471         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 472         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 473         curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 474
 475         slot->curl_result = curl_easy_perform(slot->curl);
 476         finish_active_slot(slot);
 477
 478         if (results.curl_result != CURLE_OK) {
 479                 err |= error("RPC failed; result=%d, HTTP code = %ld",
 480                         results.curl_result, results.http_code);
 481         }
 482
 483         curl_slist_free_all(headers);
 484         free(gzip_body);
 485         return err;
 486 }
 487
 488 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 489 {
 490         const char *svc = rpc->service_name;
 491         struct strbuf buf = STRBUF_INIT;
 492         struct child_process client;
 493         int err = 0;
 494
 495         memset(&client, 0, sizeof(client));
 496         client.in = -1;
 497         client.out = -1;
 498         client.git_cmd = 1;
 499         client.argv = rpc->argv;
 500         if (start_command(&client))
 501                 exit(1);
 502         if (heads)
 503                 write_or_die(client.in, heads->buf, heads->len);
 504
 505         rpc->alloc = http_post_buffer;
 506         rpc->buf = xmalloc(rpc->alloc);
 507         rpc->in = client.in;
 508         rpc->out = client.out;
 509         strbuf_init(&rpc->result, 0);
 510
 511         strbuf_addf(&buf, "%s/%s", url, svc);
 512         rpc->service_url = strbuf_detach(&buf, NULL);
 513
 514         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 515         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 516
 517         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 518         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 519
 520         while (!err) {
 521                 int n = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
 522                 if (!n)
 523                         break;
 524                 rpc->pos = 0;
 525                 rpc->len = n;
 526                 err |= post_rpc(rpc);
 527         }
 528         strbuf_read(&rpc->result, client.out, 0);
 529
 530         close(client.in);
 531         close(client.out);
 532         client.in = -1;
 533         client.out = -1;
 534
 535         err |= finish_command(&client);
 536         free(rpc->service_url);
 537         free(rpc->hdr_content_type);
 538         free(rpc->hdr_accept);
 539         free(rpc->buf);
 540         strbuf_release(&buf);
 541         return err;
 542 }
 543
 544 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 545 {
 546         struct walker *walker;
 547         char **targets = xmalloc(nr_heads * sizeof(char*));
 548         int ret, i;
 549
 550         if (options.depth)
 551                 die("dumb http transport does not support --depth");
 552         for (i = 0; i < nr_heads; i++)
 553                 targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 554
 555         walker = get_http_walker(url);
 556         walker->get_all = 1;
 557         walker->get_tree = 1;
 558         walker->get_history = 1;
 559         walker->get_verbosely = options.verbosity >= 3;
 560         walker->get_recover = 0;
 561         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 562         walker_free(walker);
 563
 564         for (i = 0; i < nr_heads; i++)
 565                 free(targets[i]);
 566         free(targets);
 567
 568         return ret ? error("Fetch failed.") : 0;
 569 }
 570
 571 static int fetch_git(struct discovery *heads,
 572         int nr_heads, struct ref **to_fetch)
 573 {
 574         struct rpc_state rpc;
 575         char *depth_arg = NULL;
 576         const char **argv;
 577         int argc = 0, i, err;
 578
 579         argv = xmalloc((15 + nr_heads) * sizeof(char*));
 580         argv[argc++] = "fetch-pack";
 581         argv[argc++] = "--stateless-rpc";
 582         argv[argc++] = "--lock-pack";
 583         if (options.followtags)
 584                 argv[argc++] = "--include-tag";
 585         if (options.thin)
 586                 argv[argc++] = "--thin";
 587         if (options.verbosity >= 3) {
 588                 argv[argc++] = "-v";
 589                 argv[argc++] = "-v";
 590         }
 591         if (!options.progress)
 592                 argv[argc++] = "--no-progress";
 593         if (options.depth) {
 594                 struct strbuf buf = STRBUF_INIT;
 595                 strbuf_addf(&buf, "--depth=%lu", options.depth);
 596                 depth_arg = strbuf_detach(&buf, NULL);
 597                 argv[argc++] = depth_arg;
 598         }
 599         argv[argc++] = url;
 600         for (i = 0; i < nr_heads; i++) {
 601                 struct ref *ref = to_fetch[i];
 602                 if (!ref->name || !*ref->name)
 603                         die("cannot fetch by sha1 over smart http");
 604                 argv[argc++] = ref->name;
 605         }
 606         argv[argc++] = NULL;
 607
 608         memset(&rpc, 0, sizeof(rpc));
 609         rpc.service_name = "git-upload-pack",
 610         rpc.argv = argv;
 611         rpc.gzip_request = 1;
 612
 613         err = rpc_service(&rpc, heads);
 614         if (rpc.result.len)
 615                 safe_write(1, rpc.result.buf, rpc.result.len);
 616         strbuf_release(&rpc.result);
 617         free(argv);
 618         free(depth_arg);
 619         return err;
 620 }
 621
 622 static int fetch(int nr_heads, struct ref **to_fetch)
 623 {
 624         struct discovery *d = discover_refs("git-upload-pack");
 625         if (d->proto_git)
 626                 return fetch_git(d, nr_heads, to_fetch);
 627         else
 628                 return fetch_dumb(nr_heads, to_fetch);
 629 }
 630
 631 static void parse_fetch(struct strbuf *buf)
 632 {
 633         struct ref **to_fetch = NULL;
 634         struct ref *list_head = NULL;
 635         struct ref **list = &list_head;
 636         int alloc_heads = 0, nr_heads = 0;
 637
 638         do {
 639                 if (!prefixcmp(buf->buf, "fetch ")) {
 640                         char *p = buf->buf + strlen("fetch ");
 641                         char *name;
 642                         struct ref *ref;
 643                         unsigned char old_sha1[20];
 644
 645                         if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 646                                 die("protocol error: expected sha/ref, got %s'", p);
 647                         if (p[40] == ' ')
 648                                 name = p + 41;
 649                         else if (!p[40])
 650                                 name = "";
 651                         else
 652                                 die("protocol error: expected sha/ref, got %s'", p);
 653
 654                         ref = alloc_ref(name);
 655                         hashcpy(ref->old_sha1, old_sha1);
 656
 657                         *list = ref;
 658                         list = &ref->next;
 659
 660                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 661                         to_fetch[nr_heads++] = ref;
 662                 }
 663                 else
 664                         die("http transport does not support %s", buf->buf);
 665
 666                 strbuf_reset(buf);
 667                 if (strbuf_getline(buf, stdin, '\n') == EOF)
 668                         return;
 669                 if (!*buf->buf)
 670                         break;
 671         } while (1);
 672
 673         if (fetch(nr_heads, to_fetch))
 674                 exit(128); /* error already reported */
 675         free_refs(list_head);
 676         free(to_fetch);
 677
 678         printf("\n");
 679         fflush(stdout);
 680         strbuf_reset(buf);
 681 }
 682
 683 static int push_dav(int nr_spec, char **specs)
 684 {
 685         const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 686         int argc = 0, i;
 687
 688         argv[argc++] = "http-push";
 689         argv[argc++] = "--helper-status";
 690         if (options.dry_run)
 691                 argv[argc++] = "--dry-run";
 692         if (options.verbosity > 1)
 693                 argv[argc++] = "--verbose";
 694         argv[argc++] = url;
 695         for (i = 0; i < nr_spec; i++)
 696                 argv[argc++] = specs[i];
 697         argv[argc++] = NULL;
 698
 699         if (run_command_v_opt(argv, RUN_GIT_CMD))
 700                 die("git-%s failed", argv[0]);
 701         free(argv);
 702         return 0;
 703 }
 704
 705 static int push_git(struct discovery *heads, int nr_spec, char **specs)
 706 {
 707         struct rpc_state rpc;
 708         const char **argv;
 709         int argc = 0, i, err;
 710
 711         argv = xmalloc((10 + nr_spec) * sizeof(char*));
 712         argv[argc++] = "send-pack";
 713         argv[argc++] = "--stateless-rpc";
 714         argv[argc++] = "--helper-status";
 715         if (options.thin)
 716                 argv[argc++] = "--thin";
 717         if (options.dry_run)
 718                 argv[argc++] = "--dry-run";
 719         if (options.verbosity > 1)
 720                 argv[argc++] = "--verbose";
 721         argv[argc++] = url;
 722         for (i = 0; i < nr_spec; i++)
 723                 argv[argc++] = specs[i];
 724         argv[argc++] = NULL;
 725
 726         memset(&rpc, 0, sizeof(rpc));
 727         rpc.service_name = "git-receive-pack",
 728         rpc.argv = argv;
 729
 730         err = rpc_service(&rpc, heads);
 731         if (rpc.result.len)
 732                 safe_write(1, rpc.result.buf, rpc.result.len);
 733         strbuf_release(&rpc.result);
 734         free(argv);
 735         return err;
 736 }
 737
 738 static int push(int nr_spec, char **specs)
 739 {
 740         struct discovery *heads = discover_refs("git-receive-pack");
 741         int ret;
 742
 743         if (heads->proto_git)
 744                 ret = push_git(heads, nr_spec, specs);
 745         else
 746                 ret = push_dav(nr_spec, specs);
 747         free_discovery(heads);
 748         return ret;
 749 }
 750
 751 static void parse_push(struct strbuf *buf)
 752 {
 753         char **specs = NULL;
 754         int alloc_spec = 0, nr_spec = 0, i;
 755
 756         do {
 757                 if (!prefixcmp(buf->buf, "push ")) {
 758                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 759                         specs[nr_spec++] = xstrdup(buf->buf + 5);
 760                 }
 761                 else
 762                         die("http transport does not support %s", buf->buf);
 763
 764                 strbuf_reset(buf);
 765                 if (strbuf_getline(buf, stdin, '\n') == EOF)
 766                         return;
 767                 if (!*buf->buf)
 768                         break;
 769         } while (1);
 770
 771         if (push(nr_spec, specs))
 772                 exit(128); /* error already reported */
 773         for (i = 0; i < nr_spec; i++)
 774                 free(specs[i]);
 775         free(specs);
 776
 777         printf("\n");
 778         fflush(stdout);
 779 }
 780
 781 int main(int argc, const char **argv)
 782 {
 783         struct strbuf buf = STRBUF_INIT;
 784         int nongit;
 785
 786         git_extract_argv0_path(argv[0]);
 787         setup_git_directory_gently(&nongit);
 788         if (argc < 2) {
 789                 fprintf(stderr, "Remote needed\n");
 790                 return 1;
 791         }
 792
 793         options.verbosity = 1;
 794         options.progress = !!isatty(2);
 795         options.thin = 1;
 796
 797         remote = remote_get(argv[1]);
 798
 799         if (argc > 2) {
 800                 url = argv[2];
 801         } else {
 802                 url = remote->url[0];
 803         }
 804
 805         http_init(remote);
 806
 807         do {
 808                 if (strbuf_getline(&buf, stdin, '\n') == EOF)
 809                         break;
 810                 if (!prefixcmp(buf.buf, "fetch ")) {
 811                         if (nongit)
 812                                 die("Fetch attempted without a local repo");
 813                         parse_fetch(&buf);
 814
 815                 } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
 816                         int for_push = !!strstr(buf.buf + 4, "for-push");
 817                         output_refs(get_refs(for_push));
 818
 819                 } else if (!prefixcmp(buf.buf, "push ")) {
 820                         parse_push(&buf);
 821
 822                 } else if (!prefixcmp(buf.buf, "option ")) {
 823                         char *name = buf.buf + strlen("option ");
 824                         char *value = strchr(name, ' ');
 825                         int result;
 826
 827                         if (value)
 828                                 *value++ = '\0';
 829                         else
 830                                 value = "true";
 831
 832                         result = set_option(name, value);
 833                         if (!result)
 834                                 printf("ok\n");
 835                         else if (result < 0)
 836                                 printf("error invalid value\n");
 837                         else
 838                                 printf("unsupported\n");
 839                         fflush(stdout);
 840
 841                 } else if (!strcmp(buf.buf, "capabilities")) {
 842                         printf("fetch\n");
 843                         printf("option\n");
 844                         printf("push\n");
 845                         printf("\n");
 846                         fflush(stdout);
 847                 } else {
 848                         return 1;
 849                 }
 850                 strbuf_reset(&buf);
 851         } while (1);
 852
 853         http_cleanup();
 854
 855         return 0;
 856 }