remote-curl.c

   1 #include "cache.h"
   2 #include "remote.h"
   3 #include "strbuf.h"
   4 #include "walker.h"
   5 #include "http.h"
   6 #include "exec_cmd.h"
   7 #include "run-command.h"
   8 #include "pkt-line.h"
   9 #include "sideband.h"
  10
  11 static struct remote *remote;
  12 static const char *url; /* always ends with a trailing slash */
  13
  14 struct options {
  15         int verbosity;
  16         unsigned long depth;
  17         unsigned progress : 1,
  18                 followtags : 1,
  19                 dry_run : 1,
  20                 thin : 1;
  21 };
  22 static struct options options;
  23
  24 static int set_option(const char *name, const char *value)
  25 {
  26         if (!strcmp(name, "verbosity")) {
  27                 char *end;
  28                 int v = strtol(value, &end, 10);
  29                 if (value == end || *end)
  30                         return -1;
  31                 options.verbosity = v;
  32                 return 0;
  33         }
  34         else if (!strcmp(name, "progress")) {
  35                 if (!strcmp(value, "true"))
  36                         options.progress = 1;
  37                 else if (!strcmp(value, "false"))
  38                         options.progress = 0;
  39                 else
  40                         return -1;
  41                 return 0;
  42         }
  43         else if (!strcmp(name, "depth")) {
  44                 char *end;
  45                 unsigned long v = strtoul(value, &end, 10);
  46                 if (value == end || *end)
  47                         return -1;
  48                 options.depth = v;
  49                 return 0;
  50         }
  51         else if (!strcmp(name, "followtags")) {
  52                 if (!strcmp(value, "true"))
  53                         options.followtags = 1;
  54                 else if (!strcmp(value, "false"))
  55                         options.followtags = 0;
  56                 else
  57                         return -1;
  58                 return 0;
  59         }
  60         else if (!strcmp(name, "dry-run")) {
  61                 if (!strcmp(value, "true"))
  62                         options.dry_run = 1;
  63                 else if (!strcmp(value, "false"))
  64                         options.dry_run = 0;
  65                 else
  66                         return -1;
  67                 return 0;
  68         }
  69         else {
  70                 return 1 /* unsupported */;
  71         }
  72 }
  73
  74 struct discovery {
  75         const char *service;
  76         char *buf_alloc;
  77         char *buf;
  78         size_t len;
  79         unsigned proto_git : 1;
  80 };
  81 static struct discovery *last_discovery;
  82
  83 static void free_discovery(struct discovery *d)
  84 {
  85         if (d) {
  86                 if (d == last_discovery)
  87                         last_discovery = NULL;
  88                 free(d->buf_alloc);
  89                 free(d);
  90         }
  91 }
  92
  93 static struct discovery* discover_refs(const char *service)
  94 {
  95         struct strbuf exp = STRBUF_INIT;
  96         struct strbuf type = STRBUF_INIT;
  97         struct strbuf buffer = STRBUF_INIT;
  98         struct discovery *last = last_discovery;
  99         char *refs_url;
 100         int http_ret, maybe_smart = 0;
 101
 102         if (last && !strcmp(service, last->service))
 103                 return last;
 104         free_discovery(last);
 105
 106         strbuf_addf(&buffer, "%sinfo/refs", url);
 107         if ((!prefixcmp(url, "http://") || !prefixcmp(url, "https://")) &&
 108              git_env_bool("GIT_SMART_HTTP", 1)) {
 109                 maybe_smart = 1;
 110                 if (!strchr(url, '?'))
 111                         strbuf_addch(&buffer, '?');
 112                 else
 113                         strbuf_addch(&buffer, '&');
 114                 strbuf_addf(&buffer, "service=%s", service);
 115         }
 116         refs_url = strbuf_detach(&buffer, NULL);
 117
 118         http_ret = http_get_strbuf(refs_url, &type, &buffer, HTTP_NO_CACHE);
 119         switch (http_ret) {
 120         case HTTP_OK:
 121                 break;
 122         case HTTP_MISSING_TARGET:
 123                 die("%s not found: did you run git update-server-info on the"
 124                     " server?", refs_url);
 125         case HTTP_NOAUTH:
 126                 die("Authentication failed");
 127         default:
 128                 http_error(refs_url, http_ret);
 129                 die("HTTP request failed");
 130         }
 131
 132         last= xcalloc(1, sizeof(*last_discovery));
 133         last->service = service;
 134         last->buf_alloc = strbuf_detach(&buffer, &last->len);
 135         last->buf = last->buf_alloc;
 136
 137         strbuf_addf(&exp, "application/x-%s-advertisement", service);
 138         if (maybe_smart &&
 139             (5 <= last->len && last->buf[4] == '#') &&
 140             !strbuf_cmp(&exp, &type)) {
 141                 char *line;
 142
 143                 /*
 144                  * smart HTTP response; validate that the service
 145                  * pkt-line matches our request.
 146                  */
 147                 line = packet_read_line_buf(&last->buf, &last->len, NULL);
 148
 149                 strbuf_reset(&exp);
 150                 strbuf_addf(&exp, "# service=%s", service);
 151                 if (strcmp(line, exp.buf))
 152                         die("invalid server response; got '%s'", line);
 153                 strbuf_release(&exp);
 154
 155                 /* The header can include additional metadata lines, up
 156                  * until a packet flush marker.  Ignore these now, but
 157                  * in the future we might start to scan them.
 158                  */
 159                 while (packet_read_line_buf(&last->buf, &last->len, NULL))
 160                         ;
 161
 162                 last->proto_git = 1;
 163         }
 164
 165         free(refs_url);
 166         strbuf_release(&exp);
 167         strbuf_release(&type);
 168         strbuf_release(&buffer);
 169         last_discovery = last;
 170         return last;
 171 }
 172
 173 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 174 {
 175         struct ref *list = NULL;
 176         get_remote_heads(-1, heads->buf, heads->len, &list,
 177                          for_push ? REF_NORMAL : 0, NULL);
 178         return list;
 179 }
 180
 181 static struct ref *parse_info_refs(struct discovery *heads)
 182 {
 183         char *data, *start, *mid;
 184         char *ref_name;
 185         int i = 0;
 186
 187         struct ref *refs = NULL;
 188         struct ref *ref = NULL;
 189         struct ref *last_ref = NULL;
 190
 191         data = heads->buf;
 192         start = NULL;
 193         mid = data;
 194         while (i < heads->len) {
 195                 if (!start) {
 196                         start = &data[i];
 197                 }
 198                 if (data[i] == '\t')
 199                         mid = &data[i];
 200                 if (data[i] == '\n') {
 201                         if (mid - start != 40)
 202                                 die("%sinfo/refs not valid: is this a git repository?", url);
 203                         data[i] = 0;
 204                         ref_name = mid + 1;
 205                         ref = xmalloc(sizeof(struct ref) +
 206                                       strlen(ref_name) + 1);
 207                         memset(ref, 0, sizeof(struct ref));
 208                         strcpy(ref->name, ref_name);
 209                         get_sha1_hex(start, ref->old_sha1);
 210                         if (!refs)
 211                                 refs = ref;
 212                         if (last_ref)
 213                                 last_ref->next = ref;
 214                         last_ref = ref;
 215                         start = NULL;
 216                 }
 217                 i++;
 218         }
 219
 220         ref = alloc_ref("HEAD");
 221         if (!http_fetch_ref(url, ref) &&
 222             !resolve_remote_symref(ref, refs)) {
 223                 ref->next = refs;
 224                 refs = ref;
 225         } else {
 226                 free(ref);
 227         }
 228
 229         return refs;
 230 }
 231
 232 static struct ref *get_refs(int for_push)
 233 {
 234         struct discovery *heads;
 235
 236         if (for_push)
 237                 heads = discover_refs("git-receive-pack");
 238         else
 239                 heads = discover_refs("git-upload-pack");
 240
 241         if (heads->proto_git)
 242                 return parse_git_refs(heads, for_push);
 243         return parse_info_refs(heads);
 244 }
 245
 246 static void output_refs(struct ref *refs)
 247 {
 248         struct ref *posn;
 249         for (posn = refs; posn; posn = posn->next) {
 250                 if (posn->symref)
 251                         printf("@%s %s\n", posn->symref, posn->name);
 252                 else
 253                         printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 254         }
 255         printf("\n");
 256         fflush(stdout);
 257         free_refs(refs);
 258 }
 259
 260 struct rpc_state {
 261         const char *service_name;
 262         const char **argv;
 263         struct strbuf *stdin_preamble;
 264         char *service_url;
 265         char *hdr_content_type;
 266         char *hdr_accept;
 267         char *buf;
 268         size_t alloc;
 269         size_t len;
 270         size_t pos;
 271         int in;
 272         int out;
 273         struct strbuf result;
 274         unsigned gzip_request : 1;
 275         unsigned initial_buffer : 1;
 276 };
 277
 278 static size_t rpc_out(void *ptr, size_t eltsize,
 279                 size_t nmemb, void *buffer_)
 280 {
 281         size_t max = eltsize * nmemb;
 282         struct rpc_state *rpc = buffer_;
 283         size_t avail = rpc->len - rpc->pos;
 284
 285         if (!avail) {
 286                 rpc->initial_buffer = 0;
 287                 avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 288                 if (!avail)
 289                         return 0;
 290                 rpc->pos = 0;
 291                 rpc->len = avail;
 292         }
 293
 294         if (max < avail)
 295                 avail = max;
 296         memcpy(ptr, rpc->buf + rpc->pos, avail);
 297         rpc->pos += avail;
 298         return avail;
 299 }
 300
 301 #ifndef NO_CURL_IOCTL
 302 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 303 {
 304         struct rpc_state *rpc = clientp;
 305
 306         switch (cmd) {
 307         case CURLIOCMD_NOP:
 308                 return CURLIOE_OK;
 309
 310         case CURLIOCMD_RESTARTREAD:
 311                 if (rpc->initial_buffer) {
 312                         rpc->pos = 0;
 313                         return CURLIOE_OK;
 314                 }
 315                 fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
 316                 return CURLIOE_FAILRESTART;
 317
 318         default:
 319                 return CURLIOE_UNKNOWNCMD;
 320         }
 321 }
 322 #endif
 323
 324 static size_t rpc_in(char *ptr, size_t eltsize,
 325                 size_t nmemb, void *buffer_)
 326 {
 327         size_t size = eltsize * nmemb;
 328         struct rpc_state *rpc = buffer_;
 329         write_or_die(rpc->in, ptr, size);
 330         return size;
 331 }
 332
 333 static int run_slot(struct active_request_slot *slot)
 334 {
 335         int err;
 336         struct slot_results results;
 337
 338         slot->results = &results;
 339         slot->curl_result = curl_easy_perform(slot->curl);
 340         finish_active_slot(slot);
 341
 342         err = handle_curl_result(&results);
 343         if (err != HTTP_OK && err != HTTP_REAUTH) {
 344                 error("RPC failed; result=%d, HTTP code = %ld",
 345                       results.curl_result, results.http_code);
 346         }
 347
 348         return err;
 349 }
 350
 351 static int probe_rpc(struct rpc_state *rpc)
 352 {
 353         struct active_request_slot *slot;
 354         struct curl_slist *headers = NULL;
 355         struct strbuf buf = STRBUF_INIT;
 356         int err;
 357
 358         slot = get_active_slot();
 359
 360         headers = curl_slist_append(headers, rpc->hdr_content_type);
 361         headers = curl_slist_append(headers, rpc->hdr_accept);
 362
 363         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 364         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 365         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 366         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 367         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 368         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 369         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 370         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 371         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 372
 373         err = run_slot(slot);
 374
 375         curl_slist_free_all(headers);
 376         strbuf_release(&buf);
 377         return err;
 378 }
 379
 380 static int post_rpc(struct rpc_state *rpc)
 381 {
 382         struct active_request_slot *slot;
 383         struct curl_slist *headers = NULL;
 384         int use_gzip = rpc->gzip_request;
 385         char *gzip_body = NULL;
 386         size_t gzip_size = 0;
 387         int err, large_request = 0;
 388
 389         /* Try to load the entire request, if we can fit it into the
 390          * allocated buffer space we can use HTTP/1.0 and avoid the
 391          * chunked encoding mess.
 392          */
 393         while (1) {
 394                 size_t left = rpc->alloc - rpc->len;
 395                 char *buf = rpc->buf + rpc->len;
 396                 int n;
 397
 398                 if (left < LARGE_PACKET_MAX) {
 399                         large_request = 1;
 400                         use_gzip = 0;
 401                         break;
 402                 }
 403
 404                 n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 405                 if (!n)
 406                         break;
 407                 rpc->len += n;
 408         }
 409
 410         if (large_request) {
 411                 do {
 412                         err = probe_rpc(rpc);
 413                 } while (err == HTTP_REAUTH);
 414                 if (err != HTTP_OK)
 415                         return -1;
 416         }
 417
 418         headers = curl_slist_append(headers, rpc->hdr_content_type);
 419         headers = curl_slist_append(headers, rpc->hdr_accept);
 420         headers = curl_slist_append(headers, "Expect:");
 421
 422 retry:
 423         slot = get_active_slot();
 424
 425         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 426         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 427         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 428         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 429
 430         if (large_request) {
 431                 /* The request body is large and the size cannot be predicted.
 432                  * We must use chunked encoding to send it.
 433                  */
 434                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 435                 rpc->initial_buffer = 1;
 436                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 437                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 438 #ifndef NO_CURL_IOCTL
 439                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 440                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 441 #endif
 442                 if (options.verbosity > 1) {
 443                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 444                         fflush(stderr);
 445                 }
 446
 447         } else if (gzip_body) {
 448                 /*
 449                  * If we are looping to retry authentication, then the previous
 450                  * run will have set up the headers and gzip buffer already,
 451                  * and we just need to send it.
 452                  */
 453                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 454                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 455
 456         } else if (use_gzip && 1024 < rpc->len) {
 457                 /* The client backend isn't giving us compressed data so
 458                  * we can try to deflate it ourselves, this may save on.
 459                  * the transfer time.
 460                  */
 461                 git_zstream stream;
 462                 int ret;
 463
 464                 memset(&stream, 0, sizeof(stream));
 465                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 466                 gzip_size = git_deflate_bound(&stream, rpc->len);
 467                 gzip_body = xmalloc(gzip_size);
 468
 469                 stream.next_in = (unsigned char *)rpc->buf;
 470                 stream.avail_in = rpc->len;
 471                 stream.next_out = (unsigned char *)gzip_body;
 472                 stream.avail_out = gzip_size;
 473
 474                 ret = git_deflate(&stream, Z_FINISH);
 475                 if (ret != Z_STREAM_END)
 476                         die("cannot deflate request; zlib deflate error %d", ret);
 477
 478                 ret = git_deflate_end_gently(&stream);
 479                 if (ret != Z_OK)
 480                         die("cannot deflate request; zlib end error %d", ret);
 481
 482                 gzip_size = stream.total_out;
 483
 484                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 485                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 486                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 487
 488                 if (options.verbosity > 1) {
 489                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 490                                 rpc->service_name,
 491                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
 492                         fflush(stderr);
 493                 }
 494         } else {
 495                 /* We know the complete request size in advance, use the
 496                  * more normal Content-Length approach.
 497                  */
 498                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 499                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 500                 if (options.verbosity > 1) {
 501                         fprintf(stderr, "POST %s (%lu bytes)\n",
 502                                 rpc->service_name, (unsigned long)rpc->len);
 503                         fflush(stderr);
 504                 }
 505         }
 506
 507         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 508         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 509         curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 510
 511         err = run_slot(slot);
 512         if (err == HTTP_REAUTH && !large_request)
 513                 goto retry;
 514         if (err != HTTP_OK)
 515                 err = -1;
 516
 517         curl_slist_free_all(headers);
 518         free(gzip_body);
 519         return err;
 520 }
 521
 522 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 523 {
 524         const char *svc = rpc->service_name;
 525         struct strbuf buf = STRBUF_INIT;
 526         struct strbuf *preamble = rpc->stdin_preamble;
 527         struct child_process client;
 528         int err = 0;
 529
 530         memset(&client, 0, sizeof(client));
 531         client.in = -1;
 532         client.out = -1;
 533         client.git_cmd = 1;
 534         client.argv = rpc->argv;
 535         if (start_command(&client))
 536                 exit(1);
 537         if (preamble)
 538                 write_or_die(client.in, preamble->buf, preamble->len);
 539         if (heads)
 540                 write_or_die(client.in, heads->buf, heads->len);
 541
 542         rpc->alloc = http_post_buffer;
 543         rpc->buf = xmalloc(rpc->alloc);
 544         rpc->in = client.in;
 545         rpc->out = client.out;
 546         strbuf_init(&rpc->result, 0);
 547
 548         strbuf_addf(&buf, "%s%s", url, svc);
 549         rpc->service_url = strbuf_detach(&buf, NULL);
 550
 551         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 552         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 553
 554         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 555         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 556
 557         while (!err) {
 558                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 559                 if (!n)
 560                         break;
 561                 rpc->pos = 0;
 562                 rpc->len = n;
 563                 err |= post_rpc(rpc);
 564         }
 565
 566         close(client.in);
 567         client.in = -1;
 568         if (!err) {
 569                 strbuf_read(&rpc->result, client.out, 0);
 570         } else {
 571                 char buf[4096];
 572                 for (;;)
 573                         if (xread(client.out, buf, sizeof(buf)) <= 0)
 574                                 break;
 575         }
 576
 577         close(client.out);
 578         client.out = -1;
 579
 580         err |= finish_command(&client);
 581         free(rpc->service_url);
 582         free(rpc->hdr_content_type);
 583         free(rpc->hdr_accept);
 584         free(rpc->buf);
 585         strbuf_release(&buf);
 586         return err;
 587 }
 588
 589 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 590 {
 591         struct walker *walker;
 592         char **targets = xmalloc(nr_heads * sizeof(char*));
 593         int ret, i;
 594
 595         if (options.depth)
 596                 die("dumb http transport does not support --depth");
 597         for (i = 0; i < nr_heads; i++)
 598                 targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 599
 600         walker = get_http_walker(url);
 601         walker->get_all = 1;
 602         walker->get_tree = 1;
 603         walker->get_history = 1;
 604         walker->get_verbosely = options.verbosity >= 3;
 605         walker->get_recover = 0;
 606         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 607         walker_free(walker);
 608
 609         for (i = 0; i < nr_heads; i++)
 610                 free(targets[i]);
 611         free(targets);
 612
 613         return ret ? error("Fetch failed.") : 0;
 614 }
 615
 616 static int fetch_git(struct discovery *heads,
 617         int nr_heads, struct ref **to_fetch)
 618 {
 619         struct rpc_state rpc;
 620         struct strbuf preamble = STRBUF_INIT;
 621         char *depth_arg = NULL;
 622         int argc = 0, i, err;
 623         const char *argv[15];
 624
 625         argv[argc++] = "fetch-pack";
 626         argv[argc++] = "--stateless-rpc";
 627         argv[argc++] = "--stdin";
 628         argv[argc++] = "--lock-pack";
 629         if (options.followtags)
 630                 argv[argc++] = "--include-tag";
 631         if (options.thin)
 632                 argv[argc++] = "--thin";
 633         if (options.verbosity >= 3) {
 634                 argv[argc++] = "-v";
 635                 argv[argc++] = "-v";
 636         }
 637         if (!options.progress)
 638                 argv[argc++] = "--no-progress";
 639         if (options.depth) {
 640                 struct strbuf buf = STRBUF_INIT;
 641                 strbuf_addf(&buf, "--depth=%lu", options.depth);
 642                 depth_arg = strbuf_detach(&buf, NULL);
 643                 argv[argc++] = depth_arg;
 644         }
 645         argv[argc++] = url;
 646         argv[argc++] = NULL;
 647
 648         for (i = 0; i < nr_heads; i++) {
 649                 struct ref *ref = to_fetch[i];
 650                 if (!ref->name || !*ref->name)
 651                         die("cannot fetch by sha1 over smart http");
 652                 packet_buf_write(&preamble, "%s\n", ref->name);
 653         }
 654         packet_buf_flush(&preamble);
 655
 656         memset(&rpc, 0, sizeof(rpc));
 657         rpc.service_name = "git-upload-pack",
 658         rpc.argv = argv;
 659         rpc.stdin_preamble = &preamble;
 660         rpc.gzip_request = 1;
 661
 662         err = rpc_service(&rpc, heads);
 663         if (rpc.result.len)
 664                 write_or_die(1, rpc.result.buf, rpc.result.len);
 665         strbuf_release(&rpc.result);
 666         strbuf_release(&preamble);
 667         free(depth_arg);
 668         return err;
 669 }
 670
 671 static int fetch(int nr_heads, struct ref **to_fetch)
 672 {
 673         struct discovery *d = discover_refs("git-upload-pack");
 674         if (d->proto_git)
 675                 return fetch_git(d, nr_heads, to_fetch);
 676         else
 677                 return fetch_dumb(nr_heads, to_fetch);
 678 }
 679
 680 static void parse_fetch(struct strbuf *buf)
 681 {
 682         struct ref **to_fetch = NULL;
 683         struct ref *list_head = NULL;
 684         struct ref **list = &list_head;
 685         int alloc_heads = 0, nr_heads = 0;
 686
 687         do {
 688                 if (!prefixcmp(buf->buf, "fetch ")) {
 689                         char *p = buf->buf + strlen("fetch ");
 690                         char *name;
 691                         struct ref *ref;
 692                         unsigned char old_sha1[20];
 693
 694                         if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 695                                 die("protocol error: expected sha/ref, got %s'", p);
 696                         if (p[40] == ' ')
 697                                 name = p + 41;
 698                         else if (!p[40])
 699                                 name = "";
 700                         else
 701                                 die("protocol error: expected sha/ref, got %s'", p);
 702
 703                         ref = alloc_ref(name);
 704                         hashcpy(ref->old_sha1, old_sha1);
 705
 706                         *list = ref;
 707                         list = &ref->next;
 708
 709                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 710                         to_fetch[nr_heads++] = ref;
 711                 }
 712                 else
 713                         die("http transport does not support %s", buf->buf);
 714
 715                 strbuf_reset(buf);
 716                 if (strbuf_getline(buf, stdin, '\n') == EOF)
 717                         return;
 718                 if (!*buf->buf)
 719                         break;
 720         } while (1);
 721
 722         if (fetch(nr_heads, to_fetch))
 723                 exit(128); /* error already reported */
 724         free_refs(list_head);
 725         free(to_fetch);
 726
 727         printf("\n");
 728         fflush(stdout);
 729         strbuf_reset(buf);
 730 }
 731
 732 static int push_dav(int nr_spec, char **specs)
 733 {
 734         const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 735         int argc = 0, i;
 736
 737         argv[argc++] = "http-push";
 738         argv[argc++] = "--helper-status";
 739         if (options.dry_run)
 740                 argv[argc++] = "--dry-run";
 741         if (options.verbosity > 1)
 742                 argv[argc++] = "--verbose";
 743         argv[argc++] = url;
 744         for (i = 0; i < nr_spec; i++)
 745                 argv[argc++] = specs[i];
 746         argv[argc++] = NULL;
 747
 748         if (run_command_v_opt(argv, RUN_GIT_CMD))
 749                 die("git-%s failed", argv[0]);
 750         free(argv);
 751         return 0;
 752 }
 753
 754 static int push_git(struct discovery *heads, int nr_spec, char **specs)
 755 {
 756         struct rpc_state rpc;
 757         const char **argv;
 758         int argc = 0, i, err;
 759
 760         argv = xmalloc((10 + nr_spec) * sizeof(char*));
 761         argv[argc++] = "send-pack";
 762         argv[argc++] = "--stateless-rpc";
 763         argv[argc++] = "--helper-status";
 764         if (options.thin)
 765                 argv[argc++] = "--thin";
 766         if (options.dry_run)
 767                 argv[argc++] = "--dry-run";
 768         if (options.verbosity == 0)
 769                 argv[argc++] = "--quiet";
 770         else if (options.verbosity > 1)
 771                 argv[argc++] = "--verbose";
 772         argv[argc++] = options.progress ? "--progress" : "--no-progress";
 773         argv[argc++] = url;
 774         for (i = 0; i < nr_spec; i++)
 775                 argv[argc++] = specs[i];
 776         argv[argc++] = NULL;
 777
 778         memset(&rpc, 0, sizeof(rpc));
 779         rpc.service_name = "git-receive-pack",
 780         rpc.argv = argv;
 781
 782         err = rpc_service(&rpc, heads);
 783         if (rpc.result.len)
 784                 write_or_die(1, rpc.result.buf, rpc.result.len);
 785         strbuf_release(&rpc.result);
 786         free(argv);
 787         return err;
 788 }
 789
 790 static int push(int nr_spec, char **specs)
 791 {
 792         struct discovery *heads = discover_refs("git-receive-pack");
 793         int ret;
 794
 795         if (heads->proto_git)
 796                 ret = push_git(heads, nr_spec, specs);
 797         else
 798                 ret = push_dav(nr_spec, specs);
 799         free_discovery(heads);
 800         return ret;
 801 }
 802
 803 static void parse_push(struct strbuf *buf)
 804 {
 805         char **specs = NULL;
 806         int alloc_spec = 0, nr_spec = 0, i, ret;
 807
 808         do {
 809                 if (!prefixcmp(buf->buf, "push ")) {
 810                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 811                         specs[nr_spec++] = xstrdup(buf->buf + 5);
 812                 }
 813                 else
 814                         die("http transport does not support %s", buf->buf);
 815
 816                 strbuf_reset(buf);
 817                 if (strbuf_getline(buf, stdin, '\n') == EOF)
 818                         goto free_specs;
 819                 if (!*buf->buf)
 820                         break;
 821         } while (1);
 822
 823         ret = push(nr_spec, specs);
 824         printf("\n");
 825         fflush(stdout);
 826
 827         if (ret)
 828                 exit(128); /* error already reported */
 829
 830  free_specs:
 831         for (i = 0; i < nr_spec; i++)
 832                 free(specs[i]);
 833         free(specs);
 834 }
 835
 836 int main(int argc, const char **argv)
 837 {
 838         struct strbuf buf = STRBUF_INIT;
 839         int nongit;
 840
 841         git_extract_argv0_path(argv[0]);
 842         setup_git_directory_gently(&nongit);
 843         if (argc < 2) {
 844                 fprintf(stderr, "Remote needed\n");
 845                 return 1;
 846         }
 847
 848         options.verbosity = 1;
 849         options.progress = !!isatty(2);
 850         options.thin = 1;
 851
 852         remote = remote_get(argv[1]);
 853
 854         if (argc > 2) {
 855                 end_url_with_slash(&buf, argv[2]);
 856         } else {
 857                 end_url_with_slash(&buf, remote->url[0]);
 858         }
 859
 860         url = strbuf_detach(&buf, NULL);
 861
 862         http_init(remote, url, 0);
 863
 864         do {
 865                 if (strbuf_getline(&buf, stdin, '\n') == EOF) {
 866                         if (ferror(stdin))
 867                                 fprintf(stderr, "Error reading command stream\n");
 868                         else
 869                                 fprintf(stderr, "Unexpected end of command stream\n");
 870                         return 1;
 871                 }
 872                 if (buf.len == 0)
 873                         break;
 874                 if (!prefixcmp(buf.buf, "fetch ")) {
 875                         if (nongit)
 876                                 die("Fetch attempted without a local repo");
 877                         parse_fetch(&buf);
 878
 879                 } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
 880                         int for_push = !!strstr(buf.buf + 4, "for-push");
 881                         output_refs(get_refs(for_push));
 882
 883                 } else if (!prefixcmp(buf.buf, "push ")) {
 884                         parse_push(&buf);
 885
 886                 } else if (!prefixcmp(buf.buf, "option ")) {
 887                         char *name = buf.buf + strlen("option ");
 888                         char *value = strchr(name, ' ');
 889                         int result;
 890
 891                         if (value)
 892                                 *value++ = '\0';
 893                         else
 894                                 value = "true";
 895
 896                         result = set_option(name, value);
 897                         if (!result)
 898                                 printf("ok\n");
 899                         else if (result < 0)
 900                                 printf("error invalid value\n");
 901                         else
 902                                 printf("unsupported\n");
 903                         fflush(stdout);
 904
 905                 } else if (!strcmp(buf.buf, "capabilities")) {
 906                         printf("fetch\n");
 907                         printf("option\n");
 908                         printf("push\n");
 909                         printf("\n");
 910                         fflush(stdout);
 911                 } else {
 912                         fprintf(stderr, "Unknown command '%s'\n", buf.buf);
 913                         return 1;
 914                 }
 915                 strbuf_reset(&buf);
 916         } while (1);
 917
 918         http_cleanup();
 919
 920         return 0;
 921 }