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) {
 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         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 in, int out, void *data)
 180 {
 181         struct discovery *heads = data;
 182         int err = 0;
 183         if (write_in_full(out, heads->buf, heads->len) != heads->len)
 184                 err = 1;
 185         close(out);
 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         async.out = -1;
 198
 199         if (start_async(&async))
 200                 die("cannot start thread to parse advertised refs");
 201         get_remote_heads(async.out, &list, 0, NULL, 0, NULL);
 202         close(async.out);
 203         if (finish_async(&async))
 204                 die("ref parsing thread failed");
 205         return list;
 206 }
 207
 208 static struct ref *parse_info_refs(struct discovery *heads)
 209 {
 210         char *data, *start, *mid;
 211         char *ref_name;
 212         int i = 0;
 213
 214         struct ref *refs = NULL;
 215         struct ref *ref = NULL;
 216         struct ref *last_ref = NULL;
 217
 218         data = heads->buf;
 219         start = NULL;
 220         mid = data;
 221         while (i < heads->len) {
 222                 if (!start) {
 223                         start = &data[i];
 224                 }
 225                 if (data[i] == '\t')
 226                         mid = &data[i];
 227                 if (data[i] == '\n') {
 228                         data[i] = 0;
 229                         ref_name = mid + 1;
 230                         ref = xmalloc(sizeof(struct ref) +
 231                                       strlen(ref_name) + 1);
 232                         memset(ref, 0, sizeof(struct ref));
 233                         strcpy(ref->name, ref_name);
 234                         get_sha1_hex(start, ref->old_sha1);
 235                         if (!refs)
 236                                 refs = ref;
 237                         if (last_ref)
 238                                 last_ref->next = ref;
 239                         last_ref = ref;
 240                         start = NULL;
 241                 }
 242                 i++;
 243         }
 244
 245         ref = alloc_ref("HEAD");
 246         if (!http_fetch_ref(url, ref) &&
 247             !resolve_remote_symref(ref, refs)) {
 248                 ref->next = refs;
 249                 refs = ref;
 250         } else {
 251                 free(ref);
 252         }
 253
 254         return refs;
 255 }
 256
 257 static struct ref *get_refs(int for_push)
 258 {
 259         struct discovery *heads;
 260
 261         if (for_push)
 262                 heads = discover_refs("git-receive-pack");
 263         else
 264                 heads = discover_refs("git-upload-pack");
 265
 266         if (heads->proto_git)
 267                 return parse_git_refs(heads);
 268         return parse_info_refs(heads);
 269 }
 270
 271 static void output_refs(struct ref *refs)
 272 {
 273         struct ref *posn;
 274         for (posn = refs; posn; posn = posn->next) {
 275                 if (posn->symref)
 276                         printf("@%s %s\n", posn->symref, posn->name);
 277                 else
 278                         printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 279         }
 280         printf("\n");
 281         fflush(stdout);
 282         free_refs(refs);
 283 }
 284
 285 struct rpc_state {
 286         const char *service_name;
 287         const char **argv;
 288         char *service_url;
 289         char *hdr_content_type;
 290         char *hdr_accept;
 291         char *buf;
 292         size_t alloc;
 293         size_t len;
 294         size_t pos;
 295         int in;
 296         int out;
 297         struct strbuf result;
 298         unsigned gzip_request : 1;
 299         unsigned initial_buffer : 1;
 300 };
 301
 302 static size_t rpc_out(void *ptr, size_t eltsize,
 303                 size_t nmemb, void *buffer_)
 304 {
 305         size_t max = eltsize * nmemb;
 306         struct rpc_state *rpc = buffer_;
 307         size_t avail = rpc->len - rpc->pos;
 308
 309         if (!avail) {
 310                 rpc->initial_buffer = 0;
 311                 avail = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
 312                 if (!avail)
 313                         return 0;
 314                 rpc->pos = 0;
 315                 rpc->len = avail;
 316         }
 317
 318         if (max < avail)
 319                 avail = max;
 320         memcpy(ptr, rpc->buf + rpc->pos, avail);
 321         rpc->pos += avail;
 322         return avail;
 323 }
 324
 325 #ifndef NO_CURL_IOCTL
 326 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 327 {
 328         struct rpc_state *rpc = clientp;
 329
 330         switch (cmd) {
 331         case CURLIOCMD_NOP:
 332                 return CURLIOE_OK;
 333
 334         case CURLIOCMD_RESTARTREAD:
 335                 if (rpc->initial_buffer) {
 336                         rpc->pos = 0;
 337                         return CURLIOE_OK;
 338                 }
 339                 fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
 340                 return CURLIOE_FAILRESTART;
 341
 342         default:
 343                 return CURLIOE_UNKNOWNCMD;
 344         }
 345 }
 346 #endif
 347
 348 static size_t rpc_in(const void *ptr, size_t eltsize,
 349                 size_t nmemb, void *buffer_)
 350 {
 351         size_t size = eltsize * nmemb;
 352         struct rpc_state *rpc = buffer_;
 353         write_or_die(rpc->in, ptr, size);
 354         return size;
 355 }
 356
 357 static int post_rpc(struct rpc_state *rpc)
 358 {
 359         struct active_request_slot *slot;
 360         struct slot_results results;
 361         struct curl_slist *headers = NULL;
 362         int use_gzip = rpc->gzip_request;
 363         char *gzip_body = NULL;
 364         int err = 0, large_request = 0;
 365
 366         /* Try to load the entire request, if we can fit it into the
 367          * allocated buffer space we can use HTTP/1.0 and avoid the
 368          * chunked encoding mess.
 369          */
 370         while (1) {
 371                 size_t left = rpc->alloc - rpc->len;
 372                 char *buf = rpc->buf + rpc->len;
 373                 int n;
 374
 375                 if (left < LARGE_PACKET_MAX) {
 376                         large_request = 1;
 377                         use_gzip = 0;
 378                         break;
 379                 }
 380
 381                 n = packet_read_line(rpc->out, buf, left);
 382                 if (!n)
 383                         break;
 384                 rpc->len += n;
 385         }
 386
 387         slot = get_active_slot();
 388         slot->results = &results;
 389
 390         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 391         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 392         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 393         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 394
 395         headers = curl_slist_append(headers, rpc->hdr_content_type);
 396         headers = curl_slist_append(headers, rpc->hdr_accept);
 397
 398         if (large_request) {
 399                 /* The request body is large and the size cannot be predicted.
 400                  * We must use chunked encoding to send it.
 401                  */
 402                 headers = curl_slist_append(headers, "Expect: 100-continue");
 403                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 404                 rpc->initial_buffer = 1;
 405                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 406                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 407 #ifndef NO_CURL_IOCTL
 408                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 409                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 410 #endif
 411                 if (options.verbosity > 1) {
 412                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 413                         fflush(stderr);
 414                 }
 415
 416         } else if (use_gzip && 1024 < rpc->len) {
 417                 /* The client backend isn't giving us compressed data so
 418                  * we can try to deflate it ourselves, this may save on.
 419                  * the transfer time.
 420                  */
 421                 size_t size;
 422                 z_stream stream;
 423                 int ret;
 424
 425                 memset(&stream, 0, sizeof(stream));
 426                 ret = deflateInit2(&stream, Z_BEST_COMPRESSION,
 427                                 Z_DEFLATED, (15 + 16),
 428                                 8, Z_DEFAULT_STRATEGY);
 429                 if (ret != Z_OK)
 430                         die("cannot deflate request; zlib init error %d", ret);
 431                 size = deflateBound(&stream, rpc->len);
 432                 gzip_body = xmalloc(size);
 433
 434                 stream.next_in = (unsigned char *)rpc->buf;
 435                 stream.avail_in = rpc->len;
 436                 stream.next_out = (unsigned char *)gzip_body;
 437                 stream.avail_out = size;
 438
 439                 ret = deflate(&stream, Z_FINISH);
 440                 if (ret != Z_STREAM_END)
 441                         die("cannot deflate request; zlib deflate error %d", ret);
 442
 443                 ret = deflateEnd(&stream);
 444                 if (ret != Z_OK)
 445                         die("cannot deflate request; zlib end error %d", ret);
 446
 447                 size = stream.total_out;
 448
 449                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 450                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 451                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, size);
 452
 453                 if (options.verbosity > 1) {
 454                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 455                                 rpc->service_name,
 456                                 (unsigned long)rpc->len, (unsigned long)size);
 457                         fflush(stderr);
 458                 }
 459         } else {
 460                 /* We know the complete request size in advance, use the
 461                  * more normal Content-Length approach.
 462                  */
 463                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 464                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 465                 if (options.verbosity > 1) {
 466                         fprintf(stderr, "POST %s (%lu bytes)\n",
 467                                 rpc->service_name, (unsigned long)rpc->len);
 468                         fflush(stderr);
 469                 }
 470         }
 471
 472         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 473         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 474         curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 475
 476         slot->curl_result = curl_easy_perform(slot->curl);
 477         finish_active_slot(slot);
 478
 479         if (results.curl_result != CURLE_OK) {
 480                 err |= error("RPC failed; result=%d, HTTP code = %ld",
 481                         results.curl_result, results.http_code);
 482         }
 483
 484         curl_slist_free_all(headers);
 485         free(gzip_body);
 486         return err;
 487 }
 488
 489 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 490 {
 491         const char *svc = rpc->service_name;
 492         struct strbuf buf = STRBUF_INIT;
 493         struct child_process client;
 494         int err = 0;
 495
 496         memset(&client, 0, sizeof(client));
 497         client.in = -1;
 498         client.out = -1;
 499         client.git_cmd = 1;
 500         client.argv = rpc->argv;
 501         if (start_command(&client))
 502                 exit(1);
 503         if (heads)
 504                 write_or_die(client.in, heads->buf, heads->len);
 505
 506         rpc->alloc = http_post_buffer;
 507         rpc->buf = xmalloc(rpc->alloc);
 508         rpc->in = client.in;
 509         rpc->out = client.out;
 510         strbuf_init(&rpc->result, 0);
 511
 512         strbuf_addf(&buf, "%s%s", url, svc);
 513         rpc->service_url = strbuf_detach(&buf, NULL);
 514
 515         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 516         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 517
 518         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 519         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 520
 521         while (!err) {
 522                 int n = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
 523                 if (!n)
 524                         break;
 525                 rpc->pos = 0;
 526                 rpc->len = n;
 527                 err |= post_rpc(rpc);
 528         }
 529         strbuf_read(&rpc->result, client.out, 0);
 530
 531         close(client.in);
 532         close(client.out);
 533         client.in = -1;
 534         client.out = -1;
 535
 536         err |= finish_command(&client);
 537         free(rpc->service_url);
 538         free(rpc->hdr_content_type);
 539         free(rpc->hdr_accept);
 540         free(rpc->buf);
 541         strbuf_release(&buf);
 542         return err;
 543 }
 544
 545 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 546 {
 547         struct walker *walker;
 548         char **targets = xmalloc(nr_heads * sizeof(char*));
 549         int ret, i;
 550
 551         if (options.depth)
 552                 die("dumb http transport does not support --depth");
 553         for (i = 0; i < nr_heads; i++)
 554                 targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 555
 556         walker = get_http_walker(url);
 557         walker->get_all = 1;
 558         walker->get_tree = 1;
 559         walker->get_history = 1;
 560         walker->get_verbosely = options.verbosity >= 3;
 561         walker->get_recover = 0;
 562         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 563         walker_free(walker);
 564
 565         for (i = 0; i < nr_heads; i++)
 566                 free(targets[i]);
 567         free(targets);
 568
 569         return ret ? error("Fetch failed.") : 0;
 570 }
 571
 572 static int fetch_git(struct discovery *heads,
 573         int nr_heads, struct ref **to_fetch)
 574 {
 575         struct rpc_state rpc;
 576         char *depth_arg = NULL;
 577         const char **argv;
 578         int argc = 0, i, err;
 579
 580         argv = xmalloc((15 + nr_heads) * sizeof(char*));
 581         argv[argc++] = "fetch-pack";
 582         argv[argc++] = "--stateless-rpc";
 583         argv[argc++] = "--lock-pack";
 584         if (options.followtags)
 585                 argv[argc++] = "--include-tag";
 586         if (options.thin)
 587                 argv[argc++] = "--thin";
 588         if (options.verbosity >= 3) {
 589                 argv[argc++] = "-v";
 590                 argv[argc++] = "-v";
 591         }
 592         if (!options.progress)
 593                 argv[argc++] = "--no-progress";
 594         if (options.depth) {
 595                 struct strbuf buf = STRBUF_INIT;
 596                 strbuf_addf(&buf, "--depth=%lu", options.depth);
 597                 depth_arg = strbuf_detach(&buf, NULL);
 598                 argv[argc++] = depth_arg;
 599         }
 600         argv[argc++] = url;
 601         for (i = 0; i < nr_heads; i++) {
 602                 struct ref *ref = to_fetch[i];
 603                 if (!ref->name || !*ref->name)
 604                         die("cannot fetch by sha1 over smart http");
 605                 argv[argc++] = ref->name;
 606         }
 607         argv[argc++] = NULL;
 608
 609         memset(&rpc, 0, sizeof(rpc));
 610         rpc.service_name = "git-upload-pack",
 611         rpc.argv = argv;
 612         rpc.gzip_request = 1;
 613
 614         err = rpc_service(&rpc, heads);
 615         if (rpc.result.len)
 616                 safe_write(1, rpc.result.buf, rpc.result.len);
 617         strbuf_release(&rpc.result);
 618         free(argv);
 619         free(depth_arg);
 620         return err;
 621 }
 622
 623 static int fetch(int nr_heads, struct ref **to_fetch)
 624 {
 625         struct discovery *d = discover_refs("git-upload-pack");
 626         if (d->proto_git)
 627                 return fetch_git(d, nr_heads, to_fetch);
 628         else
 629                 return fetch_dumb(nr_heads, to_fetch);
 630 }
 631
 632 static void parse_fetch(struct strbuf *buf)
 633 {
 634         struct ref **to_fetch = NULL;
 635         struct ref *list_head = NULL;
 636         struct ref **list = &list_head;
 637         int alloc_heads = 0, nr_heads = 0;
 638
 639         do {
 640                 if (!prefixcmp(buf->buf, "fetch ")) {
 641                         char *p = buf->buf + strlen("fetch ");
 642                         char *name;
 643                         struct ref *ref;
 644                         unsigned char old_sha1[20];
 645
 646                         if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 647                                 die("protocol error: expected sha/ref, got %s'", p);
 648                         if (p[40] == ' ')
 649                                 name = p + 41;
 650                         else if (!p[40])
 651                                 name = "";
 652                         else
 653                                 die("protocol error: expected sha/ref, got %s'", p);
 654
 655                         ref = alloc_ref(name);
 656                         hashcpy(ref->old_sha1, old_sha1);
 657
 658                         *list = ref;
 659                         list = &ref->next;
 660
 661                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 662                         to_fetch[nr_heads++] = ref;
 663                 }
 664                 else
 665                         die("http transport does not support %s", buf->buf);
 666
 667                 strbuf_reset(buf);
 668                 if (strbuf_getline(buf, stdin, '\n') == EOF)
 669                         return;
 670                 if (!*buf->buf)
 671                         break;
 672         } while (1);
 673
 674         if (fetch(nr_heads, to_fetch))
 675                 exit(128); /* error already reported */
 676         free_refs(list_head);
 677         free(to_fetch);
 678
 679         printf("\n");
 680         fflush(stdout);
 681         strbuf_reset(buf);
 682 }
 683
 684 static int push_dav(int nr_spec, char **specs)
 685 {
 686         const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 687         int argc = 0, i;
 688
 689         argv[argc++] = "http-push";
 690         argv[argc++] = "--helper-status";
 691         if (options.dry_run)
 692                 argv[argc++] = "--dry-run";
 693         if (options.verbosity > 1)
 694                 argv[argc++] = "--verbose";
 695         argv[argc++] = url;
 696         for (i = 0; i < nr_spec; i++)
 697                 argv[argc++] = specs[i];
 698         argv[argc++] = NULL;
 699
 700         if (run_command_v_opt(argv, RUN_GIT_CMD))
 701                 die("git-%s failed", argv[0]);
 702         free(argv);
 703         return 0;
 704 }
 705
 706 static int push_git(struct discovery *heads, int nr_spec, char **specs)
 707 {
 708         struct rpc_state rpc;
 709         const char **argv;
 710         int argc = 0, i, err;
 711
 712         argv = xmalloc((10 + nr_spec) * sizeof(char*));
 713         argv[argc++] = "send-pack";
 714         argv[argc++] = "--stateless-rpc";
 715         argv[argc++] = "--helper-status";
 716         if (options.thin)
 717                 argv[argc++] = "--thin";
 718         if (options.dry_run)
 719                 argv[argc++] = "--dry-run";
 720         if (options.verbosity > 1)
 721                 argv[argc++] = "--verbose";
 722         argv[argc++] = url;
 723         for (i = 0; i < nr_spec; i++)
 724                 argv[argc++] = specs[i];
 725         argv[argc++] = NULL;
 726
 727         memset(&rpc, 0, sizeof(rpc));
 728         rpc.service_name = "git-receive-pack",
 729         rpc.argv = argv;
 730
 731         err = rpc_service(&rpc, heads);
 732         if (rpc.result.len)
 733                 safe_write(1, rpc.result.buf, rpc.result.len);
 734         strbuf_release(&rpc.result);
 735         free(argv);
 736         return err;
 737 }
 738
 739 static int push(int nr_spec, char **specs)
 740 {
 741         struct discovery *heads = discover_refs("git-receive-pack");
 742         int ret;
 743
 744         if (heads->proto_git)
 745                 ret = push_git(heads, nr_spec, specs);
 746         else
 747                 ret = push_dav(nr_spec, specs);
 748         free_discovery(heads);
 749         return ret;
 750 }
 751
 752 static void parse_push(struct strbuf *buf)
 753 {
 754         char **specs = NULL;
 755         int alloc_spec = 0, nr_spec = 0, i;
 756
 757         do {
 758                 if (!prefixcmp(buf->buf, "push ")) {
 759                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 760                         specs[nr_spec++] = xstrdup(buf->buf + 5);
 761                 }
 762                 else
 763                         die("http transport does not support %s", buf->buf);
 764
 765                 strbuf_reset(buf);
 766                 if (strbuf_getline(buf, stdin, '\n') == EOF)
 767                         return;
 768                 if (!*buf->buf)
 769                         break;
 770         } while (1);
 771
 772         if (push(nr_spec, specs))
 773                 exit(128); /* error already reported */
 774         for (i = 0; i < nr_spec; i++)
 775                 free(specs[i]);
 776         free(specs);
 777
 778         printf("\n");
 779         fflush(stdout);
 780 }
 781
 782 int main(int argc, const char **argv)
 783 {
 784         struct strbuf buf = STRBUF_INIT;
 785         int nongit;
 786
 787         git_extract_argv0_path(argv[0]);
 788         setup_git_directory_gently(&nongit);
 789         if (argc < 2) {
 790                 fprintf(stderr, "Remote needed\n");
 791                 return 1;
 792         }
 793
 794         options.verbosity = 1;
 795         options.progress = !!isatty(2);
 796         options.thin = 1;
 797
 798         remote = remote_get(argv[1]);
 799
 800         if (argc > 2) {
 801                 end_url_with_slash(&buf, argv[2]);
 802         } else {
 803                 end_url_with_slash(&buf, remote->url[0]);
 804         }
 805
 806         url = strbuf_detach(&buf, NULL);
 807
 808         http_init(remote);
 809
 810         do {
 811                 if (strbuf_getline(&buf, stdin, '\n') == EOF)
 812                         break;
 813                 if (!prefixcmp(buf.buf, "fetch ")) {
 814                         if (nongit)
 815                                 die("Fetch attempted without a local repo");
 816                         parse_fetch(&buf);
 817
 818                 } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
 819                         int for_push = !!strstr(buf.buf + 4, "for-push");
 820                         output_refs(get_refs(for_push));
 821
 822                 } else if (!prefixcmp(buf.buf, "push ")) {
 823                         parse_push(&buf);
 824
 825                 } else if (!prefixcmp(buf.buf, "option ")) {
 826                         char *name = buf.buf + strlen("option ");
 827                         char *value = strchr(name, ' ');
 828                         int result;
 829
 830                         if (value)
 831                                 *value++ = '\0';
 832                         else
 833                                 value = "true";
 834
 835                         result = set_option(name, value);
 836                         if (!result)
 837                                 printf("ok\n");
 838                         else if (result < 0)
 839                                 printf("error invalid value\n");
 840                         else
 841                                 printf("unsupported\n");
 842                         fflush(stdout);
 843
 844                 } else if (!strcmp(buf.buf, "capabilities")) {
 845                         printf("fetch\n");
 846                         printf("option\n");
 847                         printf("push\n");
 848                         printf("\n");
 849                         fflush(stdout);
 850                 } else {
 851                         return 1;
 852                 }
 853                 strbuf_reset(&buf);
 854         } while (1);
 855
 856         http_cleanup();
 857
 858         return 0;
 859 }