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; /* 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         struct ref *refs;
  80         unsigned proto_git : 1;
  81 };
  82 static struct discovery *last_discovery;
  83
  84 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
  85 {
  86         struct ref *list = NULL;
  87         get_remote_heads(-1, heads->buf, heads->len, &list,
  88                          for_push ? REF_NORMAL : 0, NULL);
  89         return list;
  90 }
  91
  92 static struct ref *parse_info_refs(struct discovery *heads)
  93 {
  94         char *data, *start, *mid;
  95         char *ref_name;
  96         int i = 0;
  97
  98         struct ref *refs = NULL;
  99         struct ref *ref = NULL;
 100         struct ref *last_ref = NULL;
 101
 102         data = heads->buf;
 103         start = NULL;
 104         mid = data;
 105         while (i < heads->len) {
 106                 if (!start) {
 107                         start = &data[i];
 108                 }
 109                 if (data[i] == '\t')
 110                         mid = &data[i];
 111                 if (data[i] == '\n') {
 112                         if (mid - start != 40)
 113                                 die("%sinfo/refs not valid: is this a git repository?", url);
 114                         data[i] = 0;
 115                         ref_name = mid + 1;
 116                         ref = xmalloc(sizeof(struct ref) +
 117                                       strlen(ref_name) + 1);
 118                         memset(ref, 0, sizeof(struct ref));
 119                         strcpy(ref->name, ref_name);
 120                         get_sha1_hex(start, ref->old_sha1);
 121                         if (!refs)
 122                                 refs = ref;
 123                         if (last_ref)
 124                                 last_ref->next = ref;
 125                         last_ref = ref;
 126                         start = NULL;
 127                 }
 128                 i++;
 129         }
 130
 131         ref = alloc_ref("HEAD");
 132         if (!http_fetch_ref(url, ref) &&
 133             !resolve_remote_symref(ref, refs)) {
 134                 ref->next = refs;
 135                 refs = ref;
 136         } else {
 137                 free(ref);
 138         }
 139
 140         return refs;
 141 }
 142
 143 static void free_discovery(struct discovery *d)
 144 {
 145         if (d) {
 146                 if (d == last_discovery)
 147                         last_discovery = NULL;
 148                 free(d->buf_alloc);
 149                 free_refs(d->refs);
 150                 free(d);
 151         }
 152 }
 153
 154 static int show_http_message(struct strbuf *type, struct strbuf *msg)
 155 {
 156         const char *p, *eol;
 157
 158         /*
 159          * We only show text/plain parts, as other types are likely
 160          * to be ugly to look at on the user's terminal.
 161          *
 162          * TODO should handle "; charset=XXX", and re-encode into
 163          * logoutputencoding
 164          */
 165         if (strcasecmp(type->buf, "text/plain"))
 166                 return -1;
 167
 168         strbuf_trim(msg);
 169         if (!msg->len)
 170                 return -1;
 171
 172         p = msg->buf;
 173         do {
 174                 eol = strchrnul(p, '\n');
 175                 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 176                 p = eol + 1;
 177         } while(*eol);
 178         return 0;
 179 }
 180
 181 static struct discovery* discover_refs(const char *service, int for_push)
 182 {
 183         struct strbuf exp = STRBUF_INIT;
 184         struct strbuf type = STRBUF_INIT;
 185         struct strbuf buffer = STRBUF_INIT;
 186         struct discovery *last = last_discovery;
 187         char *refs_url;
 188         int http_ret, maybe_smart = 0;
 189
 190         if (last && !strcmp(service, last->service))
 191                 return last;
 192         free_discovery(last);
 193
 194         strbuf_addf(&buffer, "%sinfo/refs", url);
 195         if ((!prefixcmp(url, "http://") || !prefixcmp(url, "https://")) &&
 196              git_env_bool("GIT_SMART_HTTP", 1)) {
 197                 maybe_smart = 1;
 198                 if (!strchr(url, '?'))
 199                         strbuf_addch(&buffer, '?');
 200                 else
 201                         strbuf_addch(&buffer, '&');
 202                 strbuf_addf(&buffer, "service=%s", service);
 203         }
 204         refs_url = strbuf_detach(&buffer, NULL);
 205
 206         http_ret = http_get_strbuf(refs_url, &type, &buffer,
 207                                    HTTP_NO_CACHE | HTTP_KEEP_ERROR);
 208         switch (http_ret) {
 209         case HTTP_OK:
 210                 break;
 211         case HTTP_MISSING_TARGET:
 212                 if (!show_http_message(&type, &buffer))
 213                         die("repository '%s' not found", url);
 214                 die("%s not found: did you run git update-server-info on the"
 215                     " server?", refs_url);
 216         case HTTP_NOAUTH:
 217                 show_http_message(&type, &buffer);
 218                 die("Authentication failed");
 219         default:
 220                 show_http_message(&type, &buffer);
 221                 http_error(refs_url, http_ret);
 222                 die("HTTP request failed");
 223         }
 224
 225         last= xcalloc(1, sizeof(*last_discovery));
 226         last->service = service;
 227         last->buf_alloc = strbuf_detach(&buffer, &last->len);
 228         last->buf = last->buf_alloc;
 229
 230         strbuf_addf(&exp, "application/x-%s-advertisement", service);
 231         if (maybe_smart &&
 232             (5 <= last->len && last->buf[4] == '#') &&
 233             !strbuf_cmp(&exp, &type)) {
 234                 char *line;
 235
 236                 /*
 237                  * smart HTTP response; validate that the service
 238                  * pkt-line matches our request.
 239                  */
 240                 line = packet_read_line_buf(&last->buf, &last->len, NULL);
 241
 242                 strbuf_reset(&exp);
 243                 strbuf_addf(&exp, "# service=%s", service);
 244                 if (strcmp(line, exp.buf))
 245                         die("invalid server response; got '%s'", line);
 246                 strbuf_release(&exp);
 247
 248                 /* The header can include additional metadata lines, up
 249                  * until a packet flush marker.  Ignore these now, but
 250                  * in the future we might start to scan them.
 251                  */
 252                 while (packet_read_line_buf(&last->buf, &last->len, NULL))
 253                         ;
 254
 255                 last->proto_git = 1;
 256         }
 257
 258         if (last->proto_git)
 259                 last->refs = parse_git_refs(last, for_push);
 260         else
 261                 last->refs = parse_info_refs(last);
 262
 263         free(refs_url);
 264         strbuf_release(&exp);
 265         strbuf_release(&type);
 266         strbuf_release(&buffer);
 267         last_discovery = last;
 268         return last;
 269 }
 270
 271 static struct ref *get_refs(int for_push)
 272 {
 273         struct discovery *heads;
 274
 275         if (for_push)
 276                 heads = discover_refs("git-receive-pack", for_push);
 277         else
 278                 heads = discover_refs("git-upload-pack", for_push);
 279
 280         return heads->refs;
 281 }
 282
 283 static void output_refs(struct ref *refs)
 284 {
 285         struct ref *posn;
 286         for (posn = refs; posn; posn = posn->next) {
 287                 if (posn->symref)
 288                         printf("@%s %s\n", posn->symref, posn->name);
 289                 else
 290                         printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 291         }
 292         printf("\n");
 293         fflush(stdout);
 294 }
 295
 296 struct rpc_state {
 297         const char *service_name;
 298         const char **argv;
 299         struct strbuf *stdin_preamble;
 300         char *service_url;
 301         char *hdr_content_type;
 302         char *hdr_accept;
 303         char *buf;
 304         size_t alloc;
 305         size_t len;
 306         size_t pos;
 307         int in;
 308         int out;
 309         struct strbuf result;
 310         unsigned gzip_request : 1;
 311         unsigned initial_buffer : 1;
 312 };
 313
 314 static size_t rpc_out(void *ptr, size_t eltsize,
 315                 size_t nmemb, void *buffer_)
 316 {
 317         size_t max = eltsize * nmemb;
 318         struct rpc_state *rpc = buffer_;
 319         size_t avail = rpc->len - rpc->pos;
 320
 321         if (!avail) {
 322                 rpc->initial_buffer = 0;
 323                 avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 324                 if (!avail)
 325                         return 0;
 326                 rpc->pos = 0;
 327                 rpc->len = avail;
 328         }
 329
 330         if (max < avail)
 331                 avail = max;
 332         memcpy(ptr, rpc->buf + rpc->pos, avail);
 333         rpc->pos += avail;
 334         return avail;
 335 }
 336
 337 #ifndef NO_CURL_IOCTL
 338 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 339 {
 340         struct rpc_state *rpc = clientp;
 341
 342         switch (cmd) {
 343         case CURLIOCMD_NOP:
 344                 return CURLIOE_OK;
 345
 346         case CURLIOCMD_RESTARTREAD:
 347                 if (rpc->initial_buffer) {
 348                         rpc->pos = 0;
 349                         return CURLIOE_OK;
 350                 }
 351                 fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
 352                 return CURLIOE_FAILRESTART;
 353
 354         default:
 355                 return CURLIOE_UNKNOWNCMD;
 356         }
 357 }
 358 #endif
 359
 360 static size_t rpc_in(char *ptr, size_t eltsize,
 361                 size_t nmemb, void *buffer_)
 362 {
 363         size_t size = eltsize * nmemb;
 364         struct rpc_state *rpc = buffer_;
 365         write_or_die(rpc->in, ptr, size);
 366         return size;
 367 }
 368
 369 static int run_slot(struct active_request_slot *slot)
 370 {
 371         int err;
 372         struct slot_results results;
 373
 374         slot->results = &results;
 375         slot->curl_result = curl_easy_perform(slot->curl);
 376         finish_active_slot(slot);
 377
 378         err = handle_curl_result(&results);
 379         if (err != HTTP_OK && err != HTTP_REAUTH) {
 380                 error("RPC failed; result=%d, HTTP code = %ld",
 381                       results.curl_result, results.http_code);
 382         }
 383
 384         return err;
 385 }
 386
 387 static int probe_rpc(struct rpc_state *rpc)
 388 {
 389         struct active_request_slot *slot;
 390         struct curl_slist *headers = NULL;
 391         struct strbuf buf = STRBUF_INIT;
 392         int err;
 393
 394         slot = get_active_slot();
 395
 396         headers = curl_slist_append(headers, rpc->hdr_content_type);
 397         headers = curl_slist_append(headers, rpc->hdr_accept);
 398
 399         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 400         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 401         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 402         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 403         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 404         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 405         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 406         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 407         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 408
 409         err = run_slot(slot);
 410
 411         curl_slist_free_all(headers);
 412         strbuf_release(&buf);
 413         return err;
 414 }
 415
 416 static int post_rpc(struct rpc_state *rpc)
 417 {
 418         struct active_request_slot *slot;
 419         struct curl_slist *headers = NULL;
 420         int use_gzip = rpc->gzip_request;
 421         char *gzip_body = NULL;
 422         size_t gzip_size = 0;
 423         int err, large_request = 0;
 424
 425         /* Try to load the entire request, if we can fit it into the
 426          * allocated buffer space we can use HTTP/1.0 and avoid the
 427          * chunked encoding mess.
 428          */
 429         while (1) {
 430                 size_t left = rpc->alloc - rpc->len;
 431                 char *buf = rpc->buf + rpc->len;
 432                 int n;
 433
 434                 if (left < LARGE_PACKET_MAX) {
 435                         large_request = 1;
 436                         use_gzip = 0;
 437                         break;
 438                 }
 439
 440                 n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 441                 if (!n)
 442                         break;
 443                 rpc->len += n;
 444         }
 445
 446         if (large_request) {
 447                 do {
 448                         err = probe_rpc(rpc);
 449                 } while (err == HTTP_REAUTH);
 450                 if (err != HTTP_OK)
 451                         return -1;
 452         }
 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 retry:
 459         slot = get_active_slot();
 460
 461         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 462         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 463         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 464         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 465
 466         if (large_request) {
 467                 /* The request body is large and the size cannot be predicted.
 468                  * We must use chunked encoding to send it.
 469                  */
 470                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 471                 rpc->initial_buffer = 1;
 472                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 473                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 474 #ifndef NO_CURL_IOCTL
 475                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 476                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 477 #endif
 478                 if (options.verbosity > 1) {
 479                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 480                         fflush(stderr);
 481                 }
 482
 483         } else if (gzip_body) {
 484                 /*
 485                  * If we are looping to retry authentication, then the previous
 486                  * run will have set up the headers and gzip buffer already,
 487                  * and we just need to send it.
 488                  */
 489                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 490                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 491
 492         } else if (use_gzip && 1024 < rpc->len) {
 493                 /* The client backend isn't giving us compressed data so
 494                  * we can try to deflate it ourselves, this may save on.
 495                  * the transfer time.
 496                  */
 497                 git_zstream stream;
 498                 int ret;
 499
 500                 memset(&stream, 0, sizeof(stream));
 501                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 502                 gzip_size = git_deflate_bound(&stream, rpc->len);
 503                 gzip_body = xmalloc(gzip_size);
 504
 505                 stream.next_in = (unsigned char *)rpc->buf;
 506                 stream.avail_in = rpc->len;
 507                 stream.next_out = (unsigned char *)gzip_body;
 508                 stream.avail_out = gzip_size;
 509
 510                 ret = git_deflate(&stream, Z_FINISH);
 511                 if (ret != Z_STREAM_END)
 512                         die("cannot deflate request; zlib deflate error %d", ret);
 513
 514                 ret = git_deflate_end_gently(&stream);
 515                 if (ret != Z_OK)
 516                         die("cannot deflate request; zlib end error %d", ret);
 517
 518                 gzip_size = stream.total_out;
 519
 520                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 521                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 522                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 523
 524                 if (options.verbosity > 1) {
 525                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 526                                 rpc->service_name,
 527                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
 528                         fflush(stderr);
 529                 }
 530         } else {
 531                 /* We know the complete request size in advance, use the
 532                  * more normal Content-Length approach.
 533                  */
 534                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 535                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 536                 if (options.verbosity > 1) {
 537                         fprintf(stderr, "POST %s (%lu bytes)\n",
 538                                 rpc->service_name, (unsigned long)rpc->len);
 539                         fflush(stderr);
 540                 }
 541         }
 542
 543         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 544         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 545         curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 546
 547         err = run_slot(slot);
 548         if (err == HTTP_REAUTH && !large_request)
 549                 goto retry;
 550         if (err != HTTP_OK)
 551                 err = -1;
 552
 553         curl_slist_free_all(headers);
 554         free(gzip_body);
 555         return err;
 556 }
 557
 558 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 559 {
 560         const char *svc = rpc->service_name;
 561         struct strbuf buf = STRBUF_INIT;
 562         struct strbuf *preamble = rpc->stdin_preamble;
 563         struct child_process client;
 564         int err = 0;
 565
 566         memset(&client, 0, sizeof(client));
 567         client.in = -1;
 568         client.out = -1;
 569         client.git_cmd = 1;
 570         client.argv = rpc->argv;
 571         if (start_command(&client))
 572                 exit(1);
 573         if (preamble)
 574                 write_or_die(client.in, preamble->buf, preamble->len);
 575         if (heads)
 576                 write_or_die(client.in, heads->buf, heads->len);
 577
 578         rpc->alloc = http_post_buffer;
 579         rpc->buf = xmalloc(rpc->alloc);
 580         rpc->in = client.in;
 581         rpc->out = client.out;
 582         strbuf_init(&rpc->result, 0);
 583
 584         strbuf_addf(&buf, "%s%s", url, svc);
 585         rpc->service_url = strbuf_detach(&buf, NULL);
 586
 587         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 588         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 589
 590         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 591         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 592
 593         while (!err) {
 594                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 595                 if (!n)
 596                         break;
 597                 rpc->pos = 0;
 598                 rpc->len = n;
 599                 err |= post_rpc(rpc);
 600         }
 601
 602         close(client.in);
 603         client.in = -1;
 604         if (!err) {
 605                 strbuf_read(&rpc->result, client.out, 0);
 606         } else {
 607                 char buf[4096];
 608                 for (;;)
 609                         if (xread(client.out, buf, sizeof(buf)) <= 0)
 610                                 break;
 611         }
 612
 613         close(client.out);
 614         client.out = -1;
 615
 616         err |= finish_command(&client);
 617         free(rpc->service_url);
 618         free(rpc->hdr_content_type);
 619         free(rpc->hdr_accept);
 620         free(rpc->buf);
 621         strbuf_release(&buf);
 622         return err;
 623 }
 624
 625 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 626 {
 627         struct walker *walker;
 628         char **targets = xmalloc(nr_heads * sizeof(char*));
 629         int ret, i;
 630
 631         if (options.depth)
 632                 die("dumb http transport does not support --depth");
 633         for (i = 0; i < nr_heads; i++)
 634                 targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 635
 636         walker = get_http_walker(url);
 637         walker->get_all = 1;
 638         walker->get_tree = 1;
 639         walker->get_history = 1;
 640         walker->get_verbosely = options.verbosity >= 3;
 641         walker->get_recover = 0;
 642         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 643         walker_free(walker);
 644
 645         for (i = 0; i < nr_heads; i++)
 646                 free(targets[i]);
 647         free(targets);
 648
 649         return ret ? error("Fetch failed.") : 0;
 650 }
 651
 652 static int fetch_git(struct discovery *heads,
 653         int nr_heads, struct ref **to_fetch)
 654 {
 655         struct rpc_state rpc;
 656         struct strbuf preamble = STRBUF_INIT;
 657         char *depth_arg = NULL;
 658         int argc = 0, i, err;
 659         const char *argv[15];
 660
 661         argv[argc++] = "fetch-pack";
 662         argv[argc++] = "--stateless-rpc";
 663         argv[argc++] = "--stdin";
 664         argv[argc++] = "--lock-pack";
 665         if (options.followtags)
 666                 argv[argc++] = "--include-tag";
 667         if (options.thin)
 668                 argv[argc++] = "--thin";
 669         if (options.verbosity >= 3) {
 670                 argv[argc++] = "-v";
 671                 argv[argc++] = "-v";
 672         }
 673         if (!options.progress)
 674                 argv[argc++] = "--no-progress";
 675         if (options.depth) {
 676                 struct strbuf buf = STRBUF_INIT;
 677                 strbuf_addf(&buf, "--depth=%lu", options.depth);
 678                 depth_arg = strbuf_detach(&buf, NULL);
 679                 argv[argc++] = depth_arg;
 680         }
 681         argv[argc++] = url;
 682         argv[argc++] = NULL;
 683
 684         for (i = 0; i < nr_heads; i++) {
 685                 struct ref *ref = to_fetch[i];
 686                 if (!ref->name || !*ref->name)
 687                         die("cannot fetch by sha1 over smart http");
 688                 packet_buf_write(&preamble, "%s\n", ref->name);
 689         }
 690         packet_buf_flush(&preamble);
 691
 692         memset(&rpc, 0, sizeof(rpc));
 693         rpc.service_name = "git-upload-pack",
 694         rpc.argv = argv;
 695         rpc.stdin_preamble = &preamble;
 696         rpc.gzip_request = 1;
 697
 698         err = rpc_service(&rpc, heads);
 699         if (rpc.result.len)
 700                 write_or_die(1, rpc.result.buf, rpc.result.len);
 701         strbuf_release(&rpc.result);
 702         strbuf_release(&preamble);
 703         free(depth_arg);
 704         return err;
 705 }
 706
 707 static int fetch(int nr_heads, struct ref **to_fetch)
 708 {
 709         struct discovery *d = discover_refs("git-upload-pack", 0);
 710         if (d->proto_git)
 711                 return fetch_git(d, nr_heads, to_fetch);
 712         else
 713                 return fetch_dumb(nr_heads, to_fetch);
 714 }
 715
 716 static void parse_fetch(struct strbuf *buf)
 717 {
 718         struct ref **to_fetch = NULL;
 719         struct ref *list_head = NULL;
 720         struct ref **list = &list_head;
 721         int alloc_heads = 0, nr_heads = 0;
 722
 723         do {
 724                 if (!prefixcmp(buf->buf, "fetch ")) {
 725                         char *p = buf->buf + strlen("fetch ");
 726                         char *name;
 727                         struct ref *ref;
 728                         unsigned char old_sha1[20];
 729
 730                         if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 731                                 die("protocol error: expected sha/ref, got %s'", p);
 732                         if (p[40] == ' ')
 733                                 name = p + 41;
 734                         else if (!p[40])
 735                                 name = "";
 736                         else
 737                                 die("protocol error: expected sha/ref, got %s'", p);
 738
 739                         ref = alloc_ref(name);
 740                         hashcpy(ref->old_sha1, old_sha1);
 741
 742                         *list = ref;
 743                         list = &ref->next;
 744
 745                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 746                         to_fetch[nr_heads++] = ref;
 747                 }
 748                 else
 749                         die("http transport does not support %s", buf->buf);
 750
 751                 strbuf_reset(buf);
 752                 if (strbuf_getline(buf, stdin, '\n') == EOF)
 753                         return;
 754                 if (!*buf->buf)
 755                         break;
 756         } while (1);
 757
 758         if (fetch(nr_heads, to_fetch))
 759                 exit(128); /* error already reported */
 760         free_refs(list_head);
 761         free(to_fetch);
 762
 763         printf("\n");
 764         fflush(stdout);
 765         strbuf_reset(buf);
 766 }
 767
 768 static int push_dav(int nr_spec, char **specs)
 769 {
 770         const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 771         int argc = 0, i;
 772
 773         argv[argc++] = "http-push";
 774         argv[argc++] = "--helper-status";
 775         if (options.dry_run)
 776                 argv[argc++] = "--dry-run";
 777         if (options.verbosity > 1)
 778                 argv[argc++] = "--verbose";
 779         argv[argc++] = url;
 780         for (i = 0; i < nr_spec; i++)
 781                 argv[argc++] = specs[i];
 782         argv[argc++] = NULL;
 783
 784         if (run_command_v_opt(argv, RUN_GIT_CMD))
 785                 die("git-%s failed", argv[0]);
 786         free(argv);
 787         return 0;
 788 }
 789
 790 static int push_git(struct discovery *heads, int nr_spec, char **specs)
 791 {
 792         struct rpc_state rpc;
 793         const char **argv;
 794         int argc = 0, i, err;
 795
 796         argv = xmalloc((10 + nr_spec) * sizeof(char*));
 797         argv[argc++] = "send-pack";
 798         argv[argc++] = "--stateless-rpc";
 799         argv[argc++] = "--helper-status";
 800         if (options.thin)
 801                 argv[argc++] = "--thin";
 802         if (options.dry_run)
 803                 argv[argc++] = "--dry-run";
 804         if (options.verbosity == 0)
 805                 argv[argc++] = "--quiet";
 806         else if (options.verbosity > 1)
 807                 argv[argc++] = "--verbose";
 808         argv[argc++] = options.progress ? "--progress" : "--no-progress";
 809         argv[argc++] = url;
 810         for (i = 0; i < nr_spec; i++)
 811                 argv[argc++] = specs[i];
 812         argv[argc++] = NULL;
 813
 814         memset(&rpc, 0, sizeof(rpc));
 815         rpc.service_name = "git-receive-pack",
 816         rpc.argv = argv;
 817
 818         err = rpc_service(&rpc, heads);
 819         if (rpc.result.len)
 820                 write_or_die(1, rpc.result.buf, rpc.result.len);
 821         strbuf_release(&rpc.result);
 822         free(argv);
 823         return err;
 824 }
 825
 826 static int push(int nr_spec, char **specs)
 827 {
 828         struct discovery *heads = discover_refs("git-receive-pack", 1);
 829         int ret;
 830
 831         if (heads->proto_git)
 832                 ret = push_git(heads, nr_spec, specs);
 833         else
 834                 ret = push_dav(nr_spec, specs);
 835         free_discovery(heads);
 836         return ret;
 837 }
 838
 839 static void parse_push(struct strbuf *buf)
 840 {
 841         char **specs = NULL;
 842         int alloc_spec = 0, nr_spec = 0, i, ret;
 843
 844         do {
 845                 if (!prefixcmp(buf->buf, "push ")) {
 846                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 847                         specs[nr_spec++] = xstrdup(buf->buf + 5);
 848                 }
 849                 else
 850                         die("http transport does not support %s", buf->buf);
 851
 852                 strbuf_reset(buf);
 853                 if (strbuf_getline(buf, stdin, '\n') == EOF)
 854                         goto free_specs;
 855                 if (!*buf->buf)
 856                         break;
 857         } while (1);
 858
 859         ret = push(nr_spec, specs);
 860         printf("\n");
 861         fflush(stdout);
 862
 863         if (ret)
 864                 exit(128); /* error already reported */
 865
 866  free_specs:
 867         for (i = 0; i < nr_spec; i++)
 868                 free(specs[i]);
 869         free(specs);
 870 }
 871
 872 int main(int argc, const char **argv)
 873 {
 874         struct strbuf buf = STRBUF_INIT;
 875         int nongit;
 876
 877         git_extract_argv0_path(argv[0]);
 878         setup_git_directory_gently(&nongit);
 879         if (argc < 2) {
 880                 fprintf(stderr, "Remote needed\n");
 881                 return 1;
 882         }
 883
 884         options.verbosity = 1;
 885         options.progress = !!isatty(2);
 886         options.thin = 1;
 887
 888         remote = remote_get(argv[1]);
 889
 890         if (argc > 2) {
 891                 end_url_with_slash(&buf, argv[2]);
 892         } else {
 893                 end_url_with_slash(&buf, remote->url[0]);
 894         }
 895
 896         url = strbuf_detach(&buf, NULL);
 897
 898         http_init(remote, url, 0);
 899
 900         do {
 901                 if (strbuf_getline(&buf, stdin, '\n') == EOF) {
 902                         if (ferror(stdin))
 903                                 fprintf(stderr, "Error reading command stream\n");
 904                         else
 905                                 fprintf(stderr, "Unexpected end of command stream\n");
 906                         return 1;
 907                 }
 908                 if (buf.len == 0)
 909                         break;
 910                 if (!prefixcmp(buf.buf, "fetch ")) {
 911                         if (nongit)
 912                                 die("Fetch attempted without a local repo");
 913                         parse_fetch(&buf);
 914
 915                 } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
 916                         int for_push = !!strstr(buf.buf + 4, "for-push");
 917                         output_refs(get_refs(for_push));
 918
 919                 } else if (!prefixcmp(buf.buf, "push ")) {
 920                         parse_push(&buf);
 921
 922                 } else if (!prefixcmp(buf.buf, "option ")) {
 923                         char *name = buf.buf + strlen("option ");
 924                         char *value = strchr(name, ' ');
 925                         int result;
 926
 927                         if (value)
 928                                 *value++ = '\0';
 929                         else
 930                                 value = "true";
 931
 932                         result = set_option(name, value);
 933                         if (!result)
 934                                 printf("ok\n");
 935                         else if (result < 0)
 936                                 printf("error invalid value\n");
 937                         else
 938                                 printf("unsupported\n");
 939                         fflush(stdout);
 940
 941                 } else if (!strcmp(buf.buf, "capabilities")) {
 942                         printf("fetch\n");
 943                         printf("option\n");
 944                         printf("push\n");
 945                         printf("\n");
 946                         fflush(stdout);
 947                 } else {
 948                         fprintf(stderr, "Unknown command '%s'\n", buf.buf);
 949                         return 1;
 950                 }
 951                 strbuf_reset(&buf);
 952         } while (1);
 953
 954         http_cleanup();
 955
 956         return 0;
 957 }