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