git.oblomov.eu Git - git/blob - remote-curl.c

   1 #include "cache.h"
   2 #include "remote.h"
   3 #include "strbuf.h"
   4 #include "walker.h"
   5 #include "http.h"
   6 #include "exec_cmd.h"
   7 #include "run-command.h"
   8 #include "pkt-line.h"
   9 #include "sideband.h"
  10
  11 static struct remote *remote;
  12 static const char *url;
  13 static struct walker *walker;
  14
  15 struct options {
  16         int verbosity;
  17         unsigned long depth;
  18         unsigned progress : 1,
  19                 followtags : 1,
  20                 dry_run : 1,
  21                 thin : 1;
  22 };
  23 static struct options options;
  24
  25 static void init_walker(void)
  26 {
  27         if (!walker)
  28                 walker = get_http_walker(url, remote);
  29 }
  30
  31 static int set_option(const char *name, const char *value)
  32 {
  33         if (!strcmp(name, "verbosity")) {
  34                 char *end;
  35                 int v = strtol(value, &end, 10);
  36                 if (value == end || *end)
  37                         return -1;
  38                 options.verbosity = v;
  39                 return 0;
  40         }
  41         else if (!strcmp(name, "progress")) {
  42                 if (!strcmp(value, "true"))
  43                         options.progress = 1;
  44                 else if (!strcmp(value, "false"))
  45                         options.progress = 0;
  46                 else
  47                         return -1;
  48                 return 0;
  49         }
  50         else if (!strcmp(name, "depth")) {
  51                 char *end;
  52                 unsigned long v = strtoul(value, &end, 10);
  53                 if (value == end || *end)
  54                         return -1;
  55                 options.depth = v;
  56                 return 0;
  57         }
  58         else if (!strcmp(name, "followtags")) {
  59                 if (!strcmp(value, "true"))
  60                         options.followtags = 1;
  61                 else if (!strcmp(value, "false"))
  62                         options.followtags = 0;
  63                 else
  64                         return -1;
  65                 return 0;
  66         }
  67         else if (!strcmp(name, "dry-run")) {
  68                 if (!strcmp(value, "true"))
  69                         options.dry_run = 1;
  70                 else if (!strcmp(value, "false"))
  71                         options.dry_run = 0;
  72                 else
  73                         return -1;
  74                 return 0;
  75         }
  76         else {
  77                 return 1 /* unsupported */;
  78         }
  79 }
  80
  81 struct discovery {
  82         const char *service;
  83         char *buf_alloc;
  84         char *buf;
  85         size_t len;
  86         unsigned proto_git : 1;
  87 };
  88 static struct discovery *last_discovery;
  89
  90 static void free_discovery(struct discovery *d)
  91 {
  92         if (d) {
  93                 if (d == last_discovery)
  94                         last_discovery = NULL;
  95                 free(d->buf_alloc);
  96                 free(d);
  97         }
  98 }
  99
 100 static struct discovery* discover_refs(const char *service)
 101 {
 102         struct strbuf buffer = STRBUF_INIT;
 103         struct discovery *last = last_discovery;
 104         char *refs_url;
 105         int http_ret, is_http = 0, proto_git_candidate = 1;
 106
 107         if (last && !strcmp(service, last->service))
 108                 return last;
 109         free_discovery(last);
 110
 111         strbuf_addf(&buffer, "%s/info/refs", url);
 112         if (!prefixcmp(url, "http://") || !prefixcmp(url, "https://")) {
 113                 is_http = 1;
 114                 if (!strchr(url, '?'))
 115                         strbuf_addch(&buffer, '?');
 116                 else
 117                         strbuf_addch(&buffer, '&');
 118                 strbuf_addf(&buffer, "service=%s", service);
 119         }
 120         refs_url = strbuf_detach(&buffer, NULL);
 121
 122         init_walker();
 123         http_ret = http_get_strbuf(refs_url, &buffer, HTTP_NO_CACHE);
 124
 125         /* try again with "plain" url (no ? or & appended) */
 126         if (http_ret != HTTP_OK) {
 127                 free(refs_url);
 128                 strbuf_reset(&buffer);
 129
 130                 proto_git_candidate = 0;
 131                 strbuf_addf(&buffer, "%s/info/refs", url);
 132                 refs_url = strbuf_detach(&buffer, NULL);
 133
 134                 http_ret = http_get_strbuf(refs_url, &buffer, HTTP_NO_CACHE);
 135         }
 136
 137         switch (http_ret) {
 138         case HTTP_OK:
 139                 break;
 140         case HTTP_MISSING_TARGET:
 141                 die("%s not found: did you run git update-server-info on the"
 142                     " server?", refs_url);
 143         default:
 144                 http_error(refs_url, http_ret);
 145                 die("HTTP request failed");
 146         }
 147
 148         last= xcalloc(1, sizeof(*last_discovery));
 149         last->service = service;
 150         last->buf_alloc = strbuf_detach(&buffer, &last->len);
 151         last->buf = last->buf_alloc;
 152
 153         if (is_http && proto_git_candidate
 154                 && 5 <= last->len && last->buf[4] == '#') {
 155                 /* smart HTTP response; validate that the service
 156                  * pkt-line matches our request.
 157                  */
 158                 struct strbuf exp = STRBUF_INIT;
 159
 160                 if (packet_get_line(&buffer, &last->buf, &last->len) <= 0)
 161                         die("%s has invalid packet header", refs_url);
 162                 if (buffer.len && buffer.buf[buffer.len - 1] == '\n')
 163                         strbuf_setlen(&buffer, buffer.len - 1);
 164
 165                 strbuf_addf(&exp, "# service=%s", service);
 166                 if (strbuf_cmp(&exp, &buffer))
 167                         die("invalid server response; got '%s'", buffer.buf);
 168                 strbuf_release(&exp);
 169
 170                 /* The header can include additional metadata lines, up
 171                  * until a packet flush marker.  Ignore these now, but
 172                  * in the future we might start to scan them.
 173                  */
 174                 strbuf_reset(&buffer);
 175                 while (packet_get_line(&buffer, &last->buf, &last->len) > 0)
 176                         strbuf_reset(&buffer);
 177
 178                 last->proto_git = 1;
 179         }
 180
 181         free(refs_url);
 182         strbuf_release(&buffer);
 183         last_discovery = last;
 184         return last;
 185 }
 186
 187 static int write_discovery(int in, int out, void *data)
 188 {
 189         struct discovery *heads = data;
 190         int err = 0;
 191         if (write_in_full(out, heads->buf, heads->len) != heads->len)
 192                 err = 1;
 193         close(out);
 194         return err;
 195 }
 196
 197 static struct ref *parse_git_refs(struct discovery *heads)
 198 {
 199         struct ref *list = NULL;
 200         struct async async;
 201
 202         memset(&async, 0, sizeof(async));
 203         async.proc = write_discovery;
 204         async.data = heads;
 205         async.out = -1;
 206
 207         if (start_async(&async))
 208                 die("cannot start thread to parse advertised refs");
 209         get_remote_heads(async.out, &list, 0, NULL, 0, NULL);
 210         close(async.out);
 211         if (finish_async(&async))
 212                 die("ref parsing thread failed");
 213         return list;
 214 }
 215
 216 static struct ref *parse_info_refs(struct discovery *heads)
 217 {
 218         char *data, *start, *mid;
 219         char *ref_name;
 220         int i = 0;
 221
 222         struct ref *refs = NULL;
 223         struct ref *ref = NULL;
 224         struct ref *last_ref = NULL;
 225
 226         data = heads->buf;
 227         start = NULL;
 228         mid = data;
 229         while (i < heads->len) {
 230                 if (!start) {
 231                         start = &data[i];
 232                 }
 233                 if (data[i] == '\t')
 234                         mid = &data[i];
 235                 if (data[i] == '\n') {
 236                         data[i] = 0;
 237                         ref_name = mid + 1;
 238                         ref = xmalloc(sizeof(struct ref) +
 239                                       strlen(ref_name) + 1);
 240                         memset(ref, 0, sizeof(struct ref));
 241                         strcpy(ref->name, ref_name);
 242                         get_sha1_hex(start, ref->old_sha1);
 243                         if (!refs)
 244                                 refs = ref;
 245                         if (last_ref)
 246                                 last_ref->next = ref;
 247                         last_ref = ref;
 248                         start = NULL;
 249                 }
 250                 i++;
 251         }
 252
 253         init_walker();
 254         ref = alloc_ref("HEAD");
 255         if (!walker->fetch_ref(walker, ref) &&
 256             !resolve_remote_symref(ref, refs)) {
 257                 ref->next = refs;
 258                 refs = ref;
 259         } else {
 260                 free(ref);
 261         }
 262
 263         return refs;
 264 }
 265
 266 static struct ref *get_refs(int for_push)
 267 {
 268         struct discovery *heads;
 269
 270         if (for_push)
 271                 heads = discover_refs("git-receive-pack");
 272         else
 273                 heads = discover_refs("git-upload-pack");
 274
 275         if (heads->proto_git)
 276                 return parse_git_refs(heads);
 277         return parse_info_refs(heads);
 278 }
 279
 280 static void output_refs(struct ref *refs)
 281 {
 282         struct ref *posn;
 283         for (posn = refs; posn; posn = posn->next) {
 284                 if (posn->symref)
 285                         printf("@%s %s\n", posn->symref, posn->name);
 286                 else
 287                         printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 288         }
 289         printf("\n");
 290         fflush(stdout);
 291         free_refs(refs);
 292 }
 293
 294 struct rpc_state {
 295         const char *service_name;
 296         const char **argv;
 297         char *service_url;
 298         char *hdr_content_type;
 299         char *hdr_accept;
 300         char *buf;
 301         size_t alloc;
 302         size_t len;
 303         size_t pos;
 304         int in;
 305         int out;
 306         struct strbuf result;
 307         unsigned gzip_request : 1;
 308         unsigned initial_buffer : 1;
 309 };
 310
 311 static size_t rpc_out(void *ptr, size_t eltsize,
 312                 size_t nmemb, void *buffer_)
 313 {
 314         size_t max = eltsize * nmemb;
 315         struct rpc_state *rpc = buffer_;
 316         size_t avail = rpc->len - rpc->pos;
 317
 318         if (!avail) {
 319                 rpc->initial_buffer = 0;
 320                 avail = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
 321                 if (!avail)
 322                         return 0;
 323                 rpc->pos = 0;
 324                 rpc->len = avail;
 325         }
 326
 327         if (max < avail)
 328                 avail = max;
 329         memcpy(ptr, rpc->buf + rpc->pos, avail);
 330         rpc->pos += avail;
 331         return avail;
 332 }
 333
 334 #ifndef NO_CURL_IOCTL
 335 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 336 {
 337         struct rpc_state *rpc = clientp;
 338
 339         switch (cmd) {
 340         case CURLIOCMD_NOP:
 341                 return CURLIOE_OK;
 342
 343         case CURLIOCMD_RESTARTREAD:
 344                 if (rpc->initial_buffer) {
 345                         rpc->pos = 0;
 346                         return CURLIOE_OK;
 347                 }
 348                 fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
 349                 return CURLIOE_FAILRESTART;
 350
 351         default:
 352                 return CURLIOE_UNKNOWNCMD;
 353         }
 354 }
 355 #endif
 356
 357 static size_t rpc_in(const void *ptr, size_t eltsize,
 358                 size_t nmemb, void *buffer_)
 359 {
 360         size_t size = eltsize * nmemb;
 361         struct rpc_state *rpc = buffer_;
 362         write_or_die(rpc->in, ptr, size);
 363         return size;
 364 }
 365
 366 static int run_slot(struct active_request_slot *slot)
 367 {
 368         int err = 0;
 369         struct slot_results results;
 370
 371         slot->results = &results;
 372         slot->curl_result = curl_easy_perform(slot->curl);
 373         finish_active_slot(slot);
 374
 375         if (results.curl_result != CURLE_OK) {
 376                 err |= error("RPC failed; result=%d, HTTP code = %ld",
 377                         results.curl_result, results.http_code);
 378         }
 379
 380         return err;
 381 }
 382
 383 static int probe_rpc(struct rpc_state *rpc)
 384 {
 385         struct active_request_slot *slot;
 386         struct curl_slist *headers = NULL;
 387         struct strbuf buf = STRBUF_INIT;
 388         int err;
 389
 390         slot = get_active_slot();
 391
 392         headers = curl_slist_append(headers, rpc->hdr_content_type);
 393         headers = curl_slist_append(headers, rpc->hdr_accept);
 394
 395         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 396         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 397         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 398         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 399         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 400         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 401         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 402         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 403         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 404
 405         err = run_slot(slot);
 406
 407         curl_slist_free_all(headers);
 408         strbuf_release(&buf);
 409         return err;
 410 }
 411
 412 static int post_rpc(struct rpc_state *rpc)
 413 {
 414         struct active_request_slot *slot;
 415         struct curl_slist *headers = NULL;
 416         int use_gzip = rpc->gzip_request;
 417         char *gzip_body = NULL;
 418         int err, large_request = 0;
 419
 420         /* Try to load the entire request, if we can fit it into the
 421          * allocated buffer space we can use HTTP/1.0 and avoid the
 422          * chunked encoding mess.
 423          */
 424         while (1) {
 425                 size_t left = rpc->alloc - rpc->len;
 426                 char *buf = rpc->buf + rpc->len;
 427                 int n;
 428
 429                 if (left < LARGE_PACKET_MAX) {
 430                         large_request = 1;
 431                         use_gzip = 0;
 432                         break;
 433                 }
 434
 435                 n = packet_read_line(rpc->out, buf, left);
 436                 if (!n)
 437                         break;
 438                 rpc->len += n;
 439         }
 440
 441         if (large_request) {
 442                 err = probe_rpc(rpc);
 443                 if (err)
 444                         return err;
 445         }
 446
 447         slot = get_active_slot();
 448
 449         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 450         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 451         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 452         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 453
 454         headers = curl_slist_append(headers, rpc->hdr_content_type);
 455         headers = curl_slist_append(headers, rpc->hdr_accept);
 456         headers = curl_slist_append(headers, "Expect:");
 457
 458         if (large_request) {
 459                 /* The request body is large and the size cannot be predicted.
 460                  * We must use chunked encoding to send it.
 461                  */
 462                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 463                 rpc->initial_buffer = 1;
 464                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 465                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 466 #ifndef NO_CURL_IOCTL
 467                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 468                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 469 #endif
 470                 if (options.verbosity > 1) {
 471                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 472                         fflush(stderr);
 473                 }
 474
 475         } else if (use_gzip && 1024 < rpc->len) {
 476                 /* The client backend isn't giving us compressed data so
 477                  * we can try to deflate it ourselves, this may save on.
 478                  * the transfer time.
 479                  */
 480                 size_t size;
 481                 z_stream stream;
 482                 int ret;
 483
 484                 memset(&stream, 0, sizeof(stream));
 485                 ret = deflateInit2(&stream, Z_BEST_COMPRESSION,
 486                                 Z_DEFLATED, (15 + 16),
 487                                 8, Z_DEFAULT_STRATEGY);
 488                 if (ret != Z_OK)
 489                         die("cannot deflate request; zlib init error %d", ret);
 490                 size = deflateBound(&stream, rpc->len);
 491                 gzip_body = xmalloc(size);
 492
 493                 stream.next_in = (unsigned char *)rpc->buf;
 494                 stream.avail_in = rpc->len;
 495                 stream.next_out = (unsigned char *)gzip_body;
 496                 stream.avail_out = size;
 497
 498                 ret = deflate(&stream, Z_FINISH);
 499                 if (ret != Z_STREAM_END)
 500                         die("cannot deflate request; zlib deflate error %d", ret);
 501
 502                 ret = deflateEnd(&stream);
 503                 if (ret != Z_OK)
 504                         die("cannot deflate request; zlib end error %d", ret);
 505
 506                 size = stream.total_out;
 507
 508                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 509                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 510                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, size);
 511
 512                 if (options.verbosity > 1) {
 513                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 514                                 rpc->service_name,
 515                                 (unsigned long)rpc->len, (unsigned long)size);
 516                         fflush(stderr);
 517                 }
 518         } else {
 519                 /* We know the complete request size in advance, use the
 520                  * more normal Content-Length approach.
 521                  */
 522                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 523                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 524                 if (options.verbosity > 1) {
 525                         fprintf(stderr, "POST %s (%lu bytes)\n",
 526                                 rpc->service_name, (unsigned long)rpc->len);
 527                         fflush(stderr);
 528                 }
 529         }
 530
 531         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 532         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 533         curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 534
 535         err = run_slot(slot);
 536
 537         curl_slist_free_all(headers);
 538         free(gzip_body);
 539         return err;
 540 }
 541
 542 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 543 {
 544         const char *svc = rpc->service_name;
 545         struct strbuf buf = STRBUF_INIT;
 546         struct child_process client;
 547         int err = 0;
 548
 549         init_walker();
 550         memset(&client, 0, sizeof(client));
 551         client.in = -1;
 552         client.out = -1;
 553         client.git_cmd = 1;
 554         client.argv = rpc->argv;
 555         if (start_command(&client))
 556                 exit(1);
 557         if (heads)
 558                 write_or_die(client.in, heads->buf, heads->len);
 559
 560         rpc->alloc = http_post_buffer;
 561         rpc->buf = xmalloc(rpc->alloc);
 562         rpc->in = client.in;
 563         rpc->out = client.out;
 564         strbuf_init(&rpc->result, 0);
 565
 566         strbuf_addf(&buf, "%s/%s", url, svc);
 567         rpc->service_url = strbuf_detach(&buf, NULL);
 568
 569         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 570         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 571
 572         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 573         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 574
 575         while (!err) {
 576                 int n = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
 577                 if (!n)
 578                         break;
 579                 rpc->pos = 0;
 580                 rpc->len = n;
 581                 err |= post_rpc(rpc);
 582         }
 583         strbuf_read(&rpc->result, client.out, 0);
 584
 585         close(client.in);
 586         close(client.out);
 587         client.in = -1;
 588         client.out = -1;
 589
 590         err |= finish_command(&client);
 591         free(rpc->service_url);
 592         free(rpc->hdr_content_type);
 593         free(rpc->hdr_accept);
 594         free(rpc->buf);
 595         strbuf_release(&buf);
 596         return err;
 597 }
 598
 599 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 600 {
 601         char **targets = xmalloc(nr_heads * sizeof(char*));
 602         int ret, i;
 603
 604         if (options.depth)
 605                 die("dumb http transport does not support --depth");
 606         for (i = 0; i < nr_heads; i++)
 607                 targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 608
 609         init_walker();
 610         walker->get_all = 1;
 611         walker->get_tree = 1;
 612         walker->get_history = 1;
 613         walker->get_verbosely = options.verbosity >= 3;
 614         walker->get_recover = 0;
 615         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 616
 617         for (i = 0; i < nr_heads; i++)
 618                 free(targets[i]);
 619         free(targets);
 620
 621         return ret ? error("Fetch failed.") : 0;
 622 }
 623
 624 static int fetch_git(struct discovery *heads,
 625         int nr_heads, struct ref **to_fetch)
 626 {
 627         struct rpc_state rpc;
 628         char *depth_arg = NULL;
 629         const char **argv;
 630         int argc = 0, i, err;
 631
 632         argv = xmalloc((15 + nr_heads) * sizeof(char*));
 633         argv[argc++] = "fetch-pack";
 634         argv[argc++] = "--stateless-rpc";
 635         argv[argc++] = "--lock-pack";
 636         if (options.followtags)
 637                 argv[argc++] = "--include-tag";
 638         if (options.thin)
 639                 argv[argc++] = "--thin";
 640         if (options.verbosity >= 3) {
 641                 argv[argc++] = "-v";
 642                 argv[argc++] = "-v";
 643         }
 644         if (!options.progress)
 645                 argv[argc++] = "--no-progress";
 646         if (options.depth) {
 647                 struct strbuf buf = STRBUF_INIT;
 648                 strbuf_addf(&buf, "--depth=%lu", options.depth);
 649                 depth_arg = strbuf_detach(&buf, NULL);
 650                 argv[argc++] = depth_arg;
 651         }
 652         argv[argc++] = url;
 653         for (i = 0; i < nr_heads; i++) {
 654                 struct ref *ref = to_fetch[i];
 655                 if (!ref->name || !*ref->name)
 656                         die("cannot fetch by sha1 over smart http");
 657                 argv[argc++] = ref->name;
 658         }
 659         argv[argc++] = NULL;
 660
 661         memset(&rpc, 0, sizeof(rpc));
 662         rpc.service_name = "git-upload-pack",
 663         rpc.argv = argv;
 664         rpc.gzip_request = 1;
 665
 666         err = rpc_service(&rpc, heads);
 667         if (rpc.result.len)
 668                 safe_write(1, rpc.result.buf, rpc.result.len);
 669         strbuf_release(&rpc.result);
 670         free(argv);
 671         free(depth_arg);
 672         return err;
 673 }
 674
 675 static int fetch(int nr_heads, struct ref **to_fetch)
 676 {
 677         struct discovery *d = discover_refs("git-upload-pack");
 678         if (d->proto_git)
 679                 return fetch_git(d, nr_heads, to_fetch);
 680         else
 681                 return fetch_dumb(nr_heads, to_fetch);
 682 }
 683
 684 static void parse_fetch(struct strbuf *buf)
 685 {
 686         struct ref **to_fetch = NULL;
 687         struct ref *list_head = NULL;
 688         struct ref **list = &list_head;
 689         int alloc_heads = 0, nr_heads = 0;
 690
 691         do {
 692                 if (!prefixcmp(buf->buf, "fetch ")) {
 693                         char *p = buf->buf + strlen("fetch ");
 694                         char *name;
 695                         struct ref *ref;
 696                         unsigned char old_sha1[20];
 697
 698                         if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 699                                 die("protocol error: expected sha/ref, got %s'", p);
 700                         if (p[40] == ' ')
 701                                 name = p + 41;
 702                         else if (!p[40])
 703                                 name = "";
 704                         else
 705                                 die("protocol error: expected sha/ref, got %s'", p);
 706
 707                         ref = alloc_ref(name);
 708                         hashcpy(ref->old_sha1, old_sha1);
 709
 710                         *list = ref;
 711                         list = &ref->next;
 712
 713                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 714                         to_fetch[nr_heads++] = ref;
 715                 }
 716                 else
 717                         die("http transport does not support %s", buf->buf);
 718
 719                 strbuf_reset(buf);
 720                 if (strbuf_getline(buf, stdin, '\n') == EOF)
 721                         return;
 722                 if (!*buf->buf)
 723                         break;
 724         } while (1);
 725
 726         if (fetch(nr_heads, to_fetch))
 727                 exit(128); /* error already reported */
 728         free_refs(list_head);
 729         free(to_fetch);
 730
 731         printf("\n");
 732         fflush(stdout);
 733         strbuf_reset(buf);
 734 }
 735
 736 static int push_dav(int nr_spec, char **specs)
 737 {
 738         const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 739         int argc = 0, i;
 740
 741         argv[argc++] = "http-push";
 742         argv[argc++] = "--helper-status";
 743         if (options.dry_run)
 744                 argv[argc++] = "--dry-run";
 745         if (options.verbosity > 1)
 746                 argv[argc++] = "--verbose";
 747         argv[argc++] = url;
 748         for (i = 0; i < nr_spec; i++)
 749                 argv[argc++] = specs[i];
 750         argv[argc++] = NULL;
 751
 752         if (run_command_v_opt(argv, RUN_GIT_CMD))
 753                 die("git-%s failed", argv[0]);
 754         free(argv);
 755         return 0;
 756 }
 757
 758 static int push_git(struct discovery *heads, int nr_spec, char **specs)
 759 {
 760         struct rpc_state rpc;
 761         const char **argv;
 762         int argc = 0, i, err;
 763
 764         argv = xmalloc((10 + nr_spec) * sizeof(char*));
 765         argv[argc++] = "send-pack";
 766         argv[argc++] = "--stateless-rpc";
 767         argv[argc++] = "--helper-status";
 768         if (options.thin)
 769                 argv[argc++] = "--thin";
 770         if (options.dry_run)
 771                 argv[argc++] = "--dry-run";
 772         if (options.verbosity > 1)
 773                 argv[argc++] = "--verbose";
 774         argv[argc++] = url;
 775         for (i = 0; i < nr_spec; i++)
 776                 argv[argc++] = specs[i];
 777         argv[argc++] = NULL;
 778
 779         memset(&rpc, 0, sizeof(rpc));
 780         rpc.service_name = "git-receive-pack",
 781         rpc.argv = argv;
 782
 783         err = rpc_service(&rpc, heads);
 784         if (rpc.result.len)
 785                 safe_write(1, rpc.result.buf, rpc.result.len);
 786         strbuf_release(&rpc.result);
 787         free(argv);
 788         return err;
 789 }
 790
 791 static int push(int nr_spec, char **specs)
 792 {
 793         struct discovery *heads = discover_refs("git-receive-pack");
 794         int ret;
 795
 796         if (heads->proto_git)
 797                 ret = push_git(heads, nr_spec, specs);
 798         else
 799                 ret = push_dav(nr_spec, specs);
 800         free_discovery(heads);
 801         return ret;
 802 }
 803
 804 static void parse_push(struct strbuf *buf)
 805 {
 806         char **specs = NULL;
 807         int alloc_spec = 0, nr_spec = 0, i;
 808
 809         do {
 810                 if (!prefixcmp(buf->buf, "push ")) {
 811                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 812                         specs[nr_spec++] = xstrdup(buf->buf + 5);
 813                 }
 814                 else
 815                         die("http transport does not support %s", buf->buf);
 816
 817                 strbuf_reset(buf);
 818                 if (strbuf_getline(buf, stdin, '\n') == EOF)
 819                         return;
 820                 if (!*buf->buf)
 821                         break;
 822         } while (1);
 823
 824         if (push(nr_spec, specs))
 825                 exit(128); /* error already reported */
 826         for (i = 0; i < nr_spec; i++)
 827                 free(specs[i]);
 828         free(specs);
 829
 830         printf("\n");
 831         fflush(stdout);
 832 }
 833
 834 int main(int argc, const char **argv)
 835 {
 836         struct strbuf buf = STRBUF_INIT;
 837         int nongit;
 838
 839         git_extract_argv0_path(argv[0]);
 840         setup_git_directory_gently(&nongit);
 841         if (argc < 2) {
 842                 fprintf(stderr, "Remote needed\n");
 843                 return 1;
 844         }
 845
 846         options.verbosity = 1;
 847         options.progress = !!isatty(2);
 848         options.thin = 1;
 849
 850         remote = remote_get(argv[1]);
 851
 852         if (argc > 2) {
 853                 url = argv[2];
 854         } else {
 855                 url = remote->url[0];
 856         }
 857
 858         do {
 859                 if (strbuf_getline(&buf, stdin, '\n') == EOF)
 860                         break;
 861                 if (!prefixcmp(buf.buf, "fetch ")) {
 862                         if (nongit)
 863                                 die("Fetch attempted without a local repo");
 864                         parse_fetch(&buf);
 865
 866                 } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
 867                         int for_push = !!strstr(buf.buf + 4, "for-push");
 868                         output_refs(get_refs(for_push));
 869
 870                 } else if (!prefixcmp(buf.buf, "push ")) {
 871                         parse_push(&buf);
 872
 873                 } else if (!prefixcmp(buf.buf, "option ")) {
 874                         char *name = buf.buf + strlen("option ");
 875                         char *value = strchr(name, ' ');
 876                         int result;
 877
 878                         if (value)
 879                                 *value++ = '\0';
 880                         else
 881                                 value = "true";
 882
 883                         result = set_option(name, value);
 884                         if (!result)
 885                                 printf("ok\n");
 886                         else if (result < 0)
 887                                 printf("error invalid value\n");
 888                         else
 889                                 printf("unsupported\n");
 890                         fflush(stdout);
 891
 892                 } else if (!strcmp(buf.buf, "capabilities")) {
 893                         printf("fetch\n");
 894                         printf("option\n");
 895                         printf("push\n");
 896                         printf("\n");
 897                         fflush(stdout);
 898                 } else {
 899                         return 1;
 900                 }
 901                 strbuf_reset(&buf);
 902         } while (1);
 903         return 0;
 904 }