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);
  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 fd, void *data)
 188 {
 189         struct discovery *heads = data;
 190         int err = 0;
 191         if (write_in_full(fd, heads->buf, heads->len) != heads->len)
 192                 err = 1;
 193         close(fd);
 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
 206         if (start_async(&async))
 207                 die("cannot start thread to parse advertised refs");
 208         get_remote_heads(async.out, &list, 0, NULL, 0, NULL);
 209         close(async.out);
 210         if (finish_async(&async))
 211                 die("ref parsing thread failed");
 212         return list;
 213 }
 214
 215 static struct ref *parse_info_refs(struct discovery *heads)
 216 {
 217         char *data, *start, *mid;
 218         char *ref_name;
 219         int i = 0;
 220
 221         struct ref *refs = NULL;
 222         struct ref *ref = NULL;
 223         struct ref *last_ref = NULL;
 224
 225         data = heads->buf;
 226         start = NULL;
 227         mid = data;
 228         while (i < heads->len) {
 229                 if (!start) {
 230                         start = &data[i];
 231                 }
 232                 if (data[i] == '\t')
 233                         mid = &data[i];
 234                 if (data[i] == '\n') {
 235                         data[i] = 0;
 236                         ref_name = mid + 1;
 237                         ref = xmalloc(sizeof(struct ref) +
 238                                       strlen(ref_name) + 1);
 239                         memset(ref, 0, sizeof(struct ref));
 240                         strcpy(ref->name, ref_name);
 241                         get_sha1_hex(start, ref->old_sha1);
 242                         if (!refs)
 243                                 refs = ref;
 244                         if (last_ref)
 245                                 last_ref->next = ref;
 246                         last_ref = ref;
 247                         start = NULL;
 248                 }
 249                 i++;
 250         }
 251
 252         init_walker();
 253         ref = alloc_ref("HEAD");
 254         if (!walker->fetch_ref(walker, ref) &&
 255             !resolve_remote_symref(ref, refs)) {
 256                 ref->next = refs;
 257                 refs = ref;
 258         } else {
 259                 free(ref);
 260         }
 261
 262         return refs;
 263 }
 264
 265 static struct ref *get_refs(int for_push)
 266 {
 267         struct discovery *heads;
 268
 269         if (for_push)
 270                 heads = discover_refs("git-receive-pack");
 271         else
 272                 heads = discover_refs("git-upload-pack");
 273
 274         if (heads->proto_git)
 275                 return parse_git_refs(heads);
 276         return parse_info_refs(heads);
 277 }
 278
 279 static void output_refs(struct ref *refs)
 280 {
 281         struct ref *posn;
 282         for (posn = refs; posn; posn = posn->next) {
 283                 if (posn->symref)
 284                         printf("@%s %s\n", posn->symref, posn->name);
 285                 else
 286                         printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 287         }
 288         printf("\n");
 289         fflush(stdout);
 290         free_refs(refs);
 291 }
 292
 293 struct rpc_state {
 294         const char *service_name;
 295         const char **argv;
 296         char *service_url;
 297         char *hdr_content_type;
 298         char *hdr_accept;
 299         char *buf;
 300         size_t alloc;
 301         size_t len;
 302         size_t pos;
 303         int in;
 304         int out;
 305         struct strbuf result;
 306         unsigned gzip_request : 1;
 307         unsigned initial_buffer : 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                 rpc->initial_buffer = 0;
 319                 avail = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
 320                 if (!avail)
 321                         return 0;
 322                 rpc->pos = 0;
 323                 rpc->len = avail;
 324         }
 325
 326         if (max < avail)
 327                 avail = max;
 328         memcpy(ptr, rpc->buf + rpc->pos, avail);
 329         rpc->pos += avail;
 330         return avail;
 331 }
 332
 333 #ifndef NO_CURL_IOCTL
 334 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 335 {
 336         struct rpc_state *rpc = clientp;
 337
 338         switch (cmd) {
 339         case CURLIOCMD_NOP:
 340                 return CURLIOE_OK;
 341
 342         case CURLIOCMD_RESTARTREAD:
 343                 if (rpc->initial_buffer) {
 344                         rpc->pos = 0;
 345                         return CURLIOE_OK;
 346                 }
 347                 fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
 348                 return CURLIOE_FAILRESTART;
 349
 350         default:
 351                 return CURLIOE_UNKNOWNCMD;
 352         }
 353 }
 354 #endif
 355
 356 static size_t rpc_in(const void *ptr, size_t eltsize,
 357                 size_t nmemb, void *buffer_)
 358 {
 359         size_t size = eltsize * nmemb;
 360         struct rpc_state *rpc = buffer_;
 361         write_or_die(rpc->in, ptr, size);
 362         return size;
 363 }
 364
 365 static int post_rpc(struct rpc_state *rpc)
 366 {
 367         struct active_request_slot *slot;
 368         struct slot_results results;
 369         struct curl_slist *headers = NULL;
 370         int use_gzip = rpc->gzip_request;
 371         char *gzip_body = NULL;
 372         int err = 0, large_request = 0;
 373
 374         /* Try to load the entire request, if we can fit it into the
 375          * allocated buffer space we can use HTTP/1.0 and avoid the
 376          * chunked encoding mess.
 377          */
 378         while (1) {
 379                 size_t left = rpc->alloc - rpc->len;
 380                 char *buf = rpc->buf + rpc->len;
 381                 int n;
 382
 383                 if (left < LARGE_PACKET_MAX) {
 384                         large_request = 1;
 385                         use_gzip = 0;
 386                         break;
 387                 }
 388
 389                 n = packet_read_line(rpc->out, buf, left);
 390                 if (!n)
 391                         break;
 392                 rpc->len += n;
 393         }
 394
 395         slot = get_active_slot();
 396         slot->results = &results;
 397
 398         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 399         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 400         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 401         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 402
 403         headers = curl_slist_append(headers, rpc->hdr_content_type);
 404         headers = curl_slist_append(headers, rpc->hdr_accept);
 405
 406         if (large_request) {
 407                 /* The request body is large and the size cannot be predicted.
 408                  * We must use chunked encoding to send it.
 409                  */
 410                 headers = curl_slist_append(headers, "Expect: 100-continue");
 411                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 412                 rpc->initial_buffer = 1;
 413                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 414                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 415 #ifndef NO_CURL_IOCTL
 416                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 417                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 418 #endif
 419                 if (options.verbosity > 1) {
 420                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 421                         fflush(stderr);
 422                 }
 423
 424         } else if (use_gzip && 1024 < rpc->len) {
 425                 /* The client backend isn't giving us compressed data so
 426                  * we can try to deflate it ourselves, this may save on.
 427                  * the transfer time.
 428                  */
 429                 size_t size;
 430                 z_stream stream;
 431                 int ret;
 432
 433                 memset(&stream, 0, sizeof(stream));
 434                 ret = deflateInit2(&stream, Z_BEST_COMPRESSION,
 435                                 Z_DEFLATED, (15 + 16),
 436                                 8, Z_DEFAULT_STRATEGY);
 437                 if (ret != Z_OK)
 438                         die("cannot deflate request; zlib init error %d", ret);
 439                 size = deflateBound(&stream, rpc->len);
 440                 gzip_body = xmalloc(size);
 441
 442                 stream.next_in = (unsigned char *)rpc->buf;
 443                 stream.avail_in = rpc->len;
 444                 stream.next_out = (unsigned char *)gzip_body;
 445                 stream.avail_out = size;
 446
 447                 ret = deflate(&stream, Z_FINISH);
 448                 if (ret != Z_STREAM_END)
 449                         die("cannot deflate request; zlib deflate error %d", ret);
 450
 451                 ret = deflateEnd(&stream);
 452                 if (ret != Z_OK)
 453                         die("cannot deflate request; zlib end error %d", ret);
 454
 455                 size = stream.total_out;
 456
 457                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 458                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 459                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, size);
 460
 461                 if (options.verbosity > 1) {
 462                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 463                                 rpc->service_name,
 464                                 (unsigned long)rpc->len, (unsigned long)size);
 465                         fflush(stderr);
 466                 }
 467         } else {
 468                 /* We know the complete request size in advance, use the
 469                  * more normal Content-Length approach.
 470                  */
 471                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 472                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 473                 if (options.verbosity > 1) {
 474                         fprintf(stderr, "POST %s (%lu bytes)\n",
 475                                 rpc->service_name, (unsigned long)rpc->len);
 476                         fflush(stderr);
 477                 }
 478         }
 479
 480         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 481         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 482         curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 483
 484         slot->curl_result = curl_easy_perform(slot->curl);
 485         finish_active_slot(slot);
 486
 487         if (results.curl_result != CURLE_OK) {
 488                 err |= error("RPC failed; result=%d, HTTP code = %ld",
 489                         results.curl_result, results.http_code);
 490         }
 491
 492         curl_slist_free_all(headers);
 493         free(gzip_body);
 494         return err;
 495 }
 496
 497 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 498 {
 499         const char *svc = rpc->service_name;
 500         struct strbuf buf = STRBUF_INIT;
 501         struct child_process client;
 502         int err = 0;
 503
 504         init_walker();
 505         memset(&client, 0, sizeof(client));
 506         client.in = -1;
 507         client.out = -1;
 508         client.git_cmd = 1;
 509         client.argv = rpc->argv;
 510         if (start_command(&client))
 511                 exit(1);
 512         if (heads)
 513                 write_or_die(client.in, heads->buf, heads->len);
 514
 515         rpc->alloc = http_post_buffer;
 516         rpc->buf = xmalloc(rpc->alloc);
 517         rpc->in = client.in;
 518         rpc->out = client.out;
 519         strbuf_init(&rpc->result, 0);
 520
 521         strbuf_addf(&buf, "%s/%s", url, svc);
 522         rpc->service_url = strbuf_detach(&buf, NULL);
 523
 524         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 525         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 526
 527         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 528         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 529
 530         while (!err) {
 531                 int n = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
 532                 if (!n)
 533                         break;
 534                 rpc->pos = 0;
 535                 rpc->len = n;
 536                 err |= post_rpc(rpc);
 537         }
 538         strbuf_read(&rpc->result, client.out, 0);
 539
 540         close(client.in);
 541         close(client.out);
 542         client.in = -1;
 543         client.out = -1;
 544
 545         err |= finish_command(&client);
 546         free(rpc->service_url);
 547         free(rpc->hdr_content_type);
 548         free(rpc->hdr_accept);
 549         free(rpc->buf);
 550         strbuf_release(&buf);
 551         return err;
 552 }
 553
 554 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 555 {
 556         char **targets = xmalloc(nr_heads * sizeof(char*));
 557         int ret, i;
 558
 559         if (options.depth)
 560                 die("dumb http transport does not support --depth");
 561         for (i = 0; i < nr_heads; i++)
 562                 targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 563
 564         init_walker();
 565         walker->get_all = 1;
 566         walker->get_tree = 1;
 567         walker->get_history = 1;
 568         walker->get_verbosely = options.verbosity >= 3;
 569         walker->get_recover = 0;
 570         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 571
 572         for (i = 0; i < nr_heads; i++)
 573                 free(targets[i]);
 574         free(targets);
 575
 576         return ret ? error("Fetch failed.") : 0;
 577 }
 578
 579 static int fetch_git(struct discovery *heads,
 580         int nr_heads, struct ref **to_fetch)
 581 {
 582         struct rpc_state rpc;
 583         char *depth_arg = NULL;
 584         const char **argv;
 585         int argc = 0, i, err;
 586
 587         argv = xmalloc((15 + nr_heads) * sizeof(char*));
 588         argv[argc++] = "fetch-pack";
 589         argv[argc++] = "--stateless-rpc";
 590         argv[argc++] = "--lock-pack";
 591         if (options.followtags)
 592                 argv[argc++] = "--include-tag";
 593         if (options.thin)
 594                 argv[argc++] = "--thin";
 595         if (options.verbosity >= 3) {
 596                 argv[argc++] = "-v";
 597                 argv[argc++] = "-v";
 598         }
 599         if (!options.progress)
 600                 argv[argc++] = "--no-progress";
 601         if (options.depth) {
 602                 struct strbuf buf = STRBUF_INIT;
 603                 strbuf_addf(&buf, "--depth=%lu", options.depth);
 604                 depth_arg = strbuf_detach(&buf, NULL);
 605                 argv[argc++] = depth_arg;
 606         }
 607         argv[argc++] = url;
 608         for (i = 0; i < nr_heads; i++) {
 609                 struct ref *ref = to_fetch[i];
 610                 if (!ref->name || !*ref->name)
 611                         die("cannot fetch by sha1 over smart http");
 612                 argv[argc++] = ref->name;
 613         }
 614         argv[argc++] = NULL;
 615
 616         memset(&rpc, 0, sizeof(rpc));
 617         rpc.service_name = "git-upload-pack",
 618         rpc.argv = argv;
 619         rpc.gzip_request = 1;
 620
 621         err = rpc_service(&rpc, heads);
 622         if (rpc.result.len)
 623                 safe_write(1, rpc.result.buf, rpc.result.len);
 624         strbuf_release(&rpc.result);
 625         free(argv);
 626         free(depth_arg);
 627         return err;
 628 }
 629
 630 static int fetch(int nr_heads, struct ref **to_fetch)
 631 {
 632         struct discovery *d = discover_refs("git-upload-pack");
 633         if (d->proto_git)
 634                 return fetch_git(d, nr_heads, to_fetch);
 635         else
 636                 return fetch_dumb(nr_heads, to_fetch);
 637 }
 638
 639 static void parse_fetch(struct strbuf *buf)
 640 {
 641         struct ref **to_fetch = NULL;
 642         struct ref *list_head = NULL;
 643         struct ref **list = &list_head;
 644         int alloc_heads = 0, nr_heads = 0;
 645
 646         do {
 647                 if (!prefixcmp(buf->buf, "fetch ")) {
 648                         char *p = buf->buf + strlen("fetch ");
 649                         char *name;
 650                         struct ref *ref;
 651                         unsigned char old_sha1[20];
 652
 653                         if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 654                                 die("protocol error: expected sha/ref, got %s'", p);
 655                         if (p[40] == ' ')
 656                                 name = p + 41;
 657                         else if (!p[40])
 658                                 name = "";
 659                         else
 660                                 die("protocol error: expected sha/ref, got %s'", p);
 661
 662                         ref = alloc_ref(name);
 663                         hashcpy(ref->old_sha1, old_sha1);
 664
 665                         *list = ref;
 666                         list = &ref->next;
 667
 668                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 669                         to_fetch[nr_heads++] = ref;
 670                 }
 671                 else
 672                         die("http transport does not support %s", buf->buf);
 673
 674                 strbuf_reset(buf);
 675                 if (strbuf_getline(buf, stdin, '\n') == EOF)
 676                         return;
 677                 if (!*buf->buf)
 678                         break;
 679         } while (1);
 680
 681         if (fetch(nr_heads, to_fetch))
 682                 exit(128); /* error already reported */
 683         free_refs(list_head);
 684         free(to_fetch);
 685
 686         printf("\n");
 687         fflush(stdout);
 688         strbuf_reset(buf);
 689 }
 690
 691 static int push_dav(int nr_spec, char **specs)
 692 {
 693         const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 694         int argc = 0, i;
 695
 696         argv[argc++] = "http-push";
 697         argv[argc++] = "--helper-status";
 698         if (options.dry_run)
 699                 argv[argc++] = "--dry-run";
 700         if (options.verbosity > 1)
 701                 argv[argc++] = "--verbose";
 702         argv[argc++] = url;
 703         for (i = 0; i < nr_spec; i++)
 704                 argv[argc++] = specs[i];
 705         argv[argc++] = NULL;
 706
 707         if (run_command_v_opt(argv, RUN_GIT_CMD))
 708                 die("git-%s failed", argv[0]);
 709         free(argv);
 710         return 0;
 711 }
 712
 713 static int push_git(struct discovery *heads, int nr_spec, char **specs)
 714 {
 715         struct rpc_state rpc;
 716         const char **argv;
 717         int argc = 0, i, err;
 718
 719         argv = xmalloc((10 + nr_spec) * sizeof(char*));
 720         argv[argc++] = "send-pack";
 721         argv[argc++] = "--stateless-rpc";
 722         argv[argc++] = "--helper-status";
 723         if (options.thin)
 724                 argv[argc++] = "--thin";
 725         if (options.dry_run)
 726                 argv[argc++] = "--dry-run";
 727         if (options.verbosity > 1)
 728                 argv[argc++] = "--verbose";
 729         argv[argc++] = url;
 730         for (i = 0; i < nr_spec; i++)
 731                 argv[argc++] = specs[i];
 732         argv[argc++] = NULL;
 733
 734         memset(&rpc, 0, sizeof(rpc));
 735         rpc.service_name = "git-receive-pack",
 736         rpc.argv = argv;
 737
 738         err = rpc_service(&rpc, heads);
 739         if (rpc.result.len)
 740                 safe_write(1, rpc.result.buf, rpc.result.len);
 741         strbuf_release(&rpc.result);
 742         free(argv);
 743         return err;
 744 }
 745
 746 static int push(int nr_spec, char **specs)
 747 {
 748         struct discovery *heads = discover_refs("git-receive-pack");
 749         int ret;
 750
 751         if (heads->proto_git)
 752                 ret = push_git(heads, nr_spec, specs);
 753         else
 754                 ret = push_dav(nr_spec, specs);
 755         free_discovery(heads);
 756         return ret;
 757 }
 758
 759 static void parse_push(struct strbuf *buf)
 760 {
 761         char **specs = NULL;
 762         int alloc_spec = 0, nr_spec = 0, i;
 763
 764         do {
 765                 if (!prefixcmp(buf->buf, "push ")) {
 766                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 767                         specs[nr_spec++] = xstrdup(buf->buf + 5);
 768                 }
 769                 else
 770                         die("http transport does not support %s", buf->buf);
 771
 772                 strbuf_reset(buf);
 773                 if (strbuf_getline(buf, stdin, '\n') == EOF)
 774                         return;
 775                 if (!*buf->buf)
 776                         break;
 777         } while (1);
 778
 779         if (push(nr_spec, specs))
 780                 exit(128); /* error already reported */
 781         for (i = 0; i < nr_spec; i++)
 782                 free(specs[i]);
 783         free(specs);
 784
 785         printf("\n");
 786         fflush(stdout);
 787 }
 788
 789 int main(int argc, const char **argv)
 790 {
 791         struct strbuf buf = STRBUF_INIT;
 792         int nongit;
 793
 794         git_extract_argv0_path(argv[0]);
 795         setup_git_directory_gently(&nongit);
 796         if (argc < 2) {
 797                 fprintf(stderr, "Remote needed\n");
 798                 return 1;
 799         }
 800
 801         options.verbosity = 1;
 802         options.progress = !!isatty(2);
 803         options.thin = 1;
 804
 805         remote = remote_get(argv[1]);
 806
 807         if (argc > 2) {
 808                 url = argv[2];
 809         } else {
 810                 url = remote->url[0];
 811         }
 812
 813         http_init(remote);
 814
 815         do {
 816                 if (strbuf_getline(&buf, stdin, '\n') == EOF)
 817                         break;
 818                 if (!prefixcmp(buf.buf, "fetch ")) {
 819                         if (nongit)
 820                                 die("Fetch attempted without a local repo");
 821                         parse_fetch(&buf);
 822
 823                 } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
 824                         int for_push = !!strstr(buf.buf + 4, "for-push");
 825                         output_refs(get_refs(for_push));
 826
 827                 } else if (!prefixcmp(buf.buf, "push ")) {
 828                         parse_push(&buf);
 829
 830                 } else if (!prefixcmp(buf.buf, "option ")) {
 831                         char *name = buf.buf + strlen("option ");
 832                         char *value = strchr(name, ' ');
 833                         int result;
 834
 835                         if (value)
 836                                 *value++ = '\0';
 837                         else
 838                                 value = "true";
 839
 840                         result = set_option(name, value);
 841                         if (!result)
 842                                 printf("ok\n");
 843                         else if (result < 0)
 844                                 printf("error invalid value\n");
 845                         else
 846                                 printf("unsupported\n");
 847                         fflush(stdout);
 848
 849                 } else if (!strcmp(buf.buf, "capabilities")) {
 850                         printf("fetch\n");
 851                         printf("option\n");
 852                         printf("push\n");
 853                         printf("\n");
 854                         fflush(stdout);
 855                 } else {
 856                         return 1;
 857                 }
 858                 strbuf_reset(&buf);
 859         } while (1);
 860
 861         http_cleanup();
 862
 863         return 0;
 864 }