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 #include "argv-array.h"
  11 #include "credential.h"
  12
  13 static struct remote *remote;
  14 /* always ends with a trailing slash */
  15 static struct strbuf url = STRBUF_INIT;
  16
  17 struct options {
  18         int verbosity;
  19         unsigned long depth;
  20         unsigned progress : 1,
  21                 followtags : 1,
  22                 dry_run : 1,
  23                 thin : 1;
  24 };
  25 static struct options options;
  26
  27 static int set_option(const char *name, const char *value)
  28 {
  29         if (!strcmp(name, "verbosity")) {
  30                 char *end;
  31                 int v = strtol(value, &end, 10);
  32                 if (value == end || *end)
  33                         return -1;
  34                 options.verbosity = v;
  35                 return 0;
  36         }
  37         else if (!strcmp(name, "progress")) {
  38                 if (!strcmp(value, "true"))
  39                         options.progress = 1;
  40                 else if (!strcmp(value, "false"))
  41                         options.progress = 0;
  42                 else
  43                         return -1;
  44                 return 0;
  45         }
  46         else if (!strcmp(name, "depth")) {
  47                 char *end;
  48                 unsigned long v = strtoul(value, &end, 10);
  49                 if (value == end || *end)
  50                         return -1;
  51                 options.depth = v;
  52                 return 0;
  53         }
  54         else if (!strcmp(name, "followtags")) {
  55                 if (!strcmp(value, "true"))
  56                         options.followtags = 1;
  57                 else if (!strcmp(value, "false"))
  58                         options.followtags = 0;
  59                 else
  60                         return -1;
  61                 return 0;
  62         }
  63         else if (!strcmp(name, "dry-run")) {
  64                 if (!strcmp(value, "true"))
  65                         options.dry_run = 1;
  66                 else if (!strcmp(value, "false"))
  67                         options.dry_run = 0;
  68                 else
  69                         return -1;
  70                 return 0;
  71         }
  72         else {
  73                 return 1 /* unsupported */;
  74         }
  75 }
  76
  77 struct discovery {
  78         const char *service;
  79         char *buf_alloc;
  80         char *buf;
  81         size_t len;
  82         struct ref *refs;
  83         unsigned proto_git : 1;
  84 };
  85 static struct discovery *last_discovery;
  86
  87 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
  88 {
  89         struct ref *list = NULL;
  90         get_remote_heads(-1, heads->buf, heads->len, &list,
  91                          for_push ? REF_NORMAL : 0, NULL);
  92         return list;
  93 }
  94
  95 static struct ref *parse_info_refs(struct discovery *heads)
  96 {
  97         char *data, *start, *mid;
  98         char *ref_name;
  99         int i = 0;
 100
 101         struct ref *refs = NULL;
 102         struct ref *ref = NULL;
 103         struct ref *last_ref = NULL;
 104
 105         data = heads->buf;
 106         start = NULL;
 107         mid = data;
 108         while (i < heads->len) {
 109                 if (!start) {
 110                         start = &data[i];
 111                 }
 112                 if (data[i] == '\t')
 113                         mid = &data[i];
 114                 if (data[i] == '\n') {
 115                         if (mid - start != 40)
 116                                 die("%sinfo/refs not valid: is this a git repository?",
 117                                     url.buf);
 118                         data[i] = 0;
 119                         ref_name = mid + 1;
 120                         ref = xmalloc(sizeof(struct ref) +
 121                                       strlen(ref_name) + 1);
 122                         memset(ref, 0, sizeof(struct ref));
 123                         strcpy(ref->name, ref_name);
 124                         get_sha1_hex(start, ref->old_sha1);
 125                         if (!refs)
 126                                 refs = ref;
 127                         if (last_ref)
 128                                 last_ref->next = ref;
 129                         last_ref = ref;
 130                         start = NULL;
 131                 }
 132                 i++;
 133         }
 134
 135         ref = alloc_ref("HEAD");
 136         if (!http_fetch_ref(url.buf, ref) &&
 137             !resolve_remote_symref(ref, refs)) {
 138                 ref->next = refs;
 139                 refs = ref;
 140         } else {
 141                 free(ref);
 142         }
 143
 144         return refs;
 145 }
 146
 147 static void free_discovery(struct discovery *d)
 148 {
 149         if (d) {
 150                 if (d == last_discovery)
 151                         last_discovery = NULL;
 152                 free(d->buf_alloc);
 153                 free_refs(d->refs);
 154                 free(d);
 155         }
 156 }
 157
 158 static int show_http_message(struct strbuf *type, struct strbuf *msg)
 159 {
 160         const char *p, *eol;
 161
 162         /*
 163          * We only show text/plain parts, as other types are likely
 164          * to be ugly to look at on the user's terminal.
 165          *
 166          * TODO should handle "; charset=XXX", and re-encode into
 167          * logoutputencoding
 168          */
 169         if (strcasecmp(type->buf, "text/plain"))
 170                 return -1;
 171
 172         strbuf_trim(msg);
 173         if (!msg->len)
 174                 return -1;
 175
 176         p = msg->buf;
 177         do {
 178                 eol = strchrnul(p, '\n');
 179                 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 180                 p = eol + 1;
 181         } while(*eol);
 182         return 0;
 183 }
 184
 185 static struct discovery* discover_refs(const char *service, int for_push)
 186 {
 187         struct strbuf exp = STRBUF_INIT;
 188         struct strbuf type = STRBUF_INIT;
 189         struct strbuf buffer = STRBUF_INIT;
 190         struct strbuf refs_url = STRBUF_INIT;
 191         struct discovery *last = last_discovery;
 192         int http_ret, maybe_smart = 0;
 193         struct http_get_options options;
 194
 195         if (last && !strcmp(service, last->service))
 196                 return last;
 197         free_discovery(last);
 198
 199         strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 200         if ((!prefixcmp(url.buf, "http://") || !prefixcmp(url.buf, "https://")) &&
 201              git_env_bool("GIT_SMART_HTTP", 1)) {
 202                 maybe_smart = 1;
 203                 if (!strchr(url.buf, '?'))
 204                         strbuf_addch(&refs_url, '?');
 205                 else
 206                         strbuf_addch(&refs_url, '&');
 207                 strbuf_addf(&refs_url, "service=%s", service);
 208         }
 209
 210         memset(&options, 0, sizeof(options));
 211         options.content_type = &type;
 212         options.no_cache = 1;
 213         options.keep_error = 1;
 214
 215         http_ret = http_get_strbuf(refs_url.buf, &buffer, &options);
 216         switch (http_ret) {
 217         case HTTP_OK:
 218                 break;
 219         case HTTP_MISSING_TARGET:
 220                 show_http_message(&type, &buffer);
 221                 die("repository '%s' not found", url.buf);
 222         case HTTP_NOAUTH:
 223                 show_http_message(&type, &buffer);
 224                 die("Authentication failed for '%s'", url.buf);
 225         default:
 226                 show_http_message(&type, &buffer);
 227                 die("unable to access '%s': %s", url.buf, curl_errorstr);
 228         }
 229
 230         last= xcalloc(1, sizeof(*last_discovery));
 231         last->service = service;
 232         last->buf_alloc = strbuf_detach(&buffer, &last->len);
 233         last->buf = last->buf_alloc;
 234
 235         strbuf_addf(&exp, "application/x-%s-advertisement", service);
 236         if (maybe_smart &&
 237             (5 <= last->len && last->buf[4] == '#') &&
 238             !strbuf_cmp(&exp, &type)) {
 239                 char *line;
 240
 241                 /*
 242                  * smart HTTP response; validate that the service
 243                  * pkt-line matches our request.
 244                  */
 245                 line = packet_read_line_buf(&last->buf, &last->len, NULL);
 246
 247                 strbuf_reset(&exp);
 248                 strbuf_addf(&exp, "# service=%s", service);
 249                 if (strcmp(line, exp.buf))
 250                         die("invalid server response; got '%s'", line);
 251                 strbuf_release(&exp);
 252
 253                 /* The header can include additional metadata lines, up
 254                  * until a packet flush marker.  Ignore these now, but
 255                  * in the future we might start to scan them.
 256                  */
 257                 while (packet_read_line_buf(&last->buf, &last->len, NULL))
 258                         ;
 259
 260                 last->proto_git = 1;
 261         }
 262
 263         if (last->proto_git)
 264                 last->refs = parse_git_refs(last, for_push);
 265         else
 266                 last->refs = parse_info_refs(last);
 267
 268         strbuf_release(&refs_url);
 269         strbuf_release(&exp);
 270         strbuf_release(&type);
 271         strbuf_release(&buffer);
 272         last_discovery = last;
 273         return last;
 274 }
 275
 276 static struct ref *get_refs(int for_push)
 277 {
 278         struct discovery *heads;
 279
 280         if (for_push)
 281                 heads = discover_refs("git-receive-pack", for_push);
 282         else
 283                 heads = discover_refs("git-upload-pack", for_push);
 284
 285         return heads->refs;
 286 }
 287
 288 static void output_refs(struct ref *refs)
 289 {
 290         struct ref *posn;
 291         for (posn = refs; posn; posn = posn->next) {
 292                 if (posn->symref)
 293                         printf("@%s %s\n", posn->symref, posn->name);
 294                 else
 295                         printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 296         }
 297         printf("\n");
 298         fflush(stdout);
 299 }
 300
 301 struct rpc_state {
 302         const char *service_name;
 303         const char **argv;
 304         struct strbuf *stdin_preamble;
 305         char *service_url;
 306         char *hdr_content_type;
 307         char *hdr_accept;
 308         char *buf;
 309         size_t alloc;
 310         size_t len;
 311         size_t pos;
 312         int in;
 313         int out;
 314         struct strbuf result;
 315         unsigned gzip_request : 1;
 316         unsigned initial_buffer : 1;
 317 };
 318
 319 static size_t rpc_out(void *ptr, size_t eltsize,
 320                 size_t nmemb, void *buffer_)
 321 {
 322         size_t max = eltsize * nmemb;
 323         struct rpc_state *rpc = buffer_;
 324         size_t avail = rpc->len - rpc->pos;
 325
 326         if (!avail) {
 327                 rpc->initial_buffer = 0;
 328                 avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 329                 if (!avail)
 330                         return 0;
 331                 rpc->pos = 0;
 332                 rpc->len = avail;
 333         }
 334
 335         if (max < avail)
 336                 avail = max;
 337         memcpy(ptr, rpc->buf + rpc->pos, avail);
 338         rpc->pos += avail;
 339         return avail;
 340 }
 341
 342 #ifndef NO_CURL_IOCTL
 343 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 344 {
 345         struct rpc_state *rpc = clientp;
 346
 347         switch (cmd) {
 348         case CURLIOCMD_NOP:
 349                 return CURLIOE_OK;
 350
 351         case CURLIOCMD_RESTARTREAD:
 352                 if (rpc->initial_buffer) {
 353                         rpc->pos = 0;
 354                         return CURLIOE_OK;
 355                 }
 356                 fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
 357                 return CURLIOE_FAILRESTART;
 358
 359         default:
 360                 return CURLIOE_UNKNOWNCMD;
 361         }
 362 }
 363 #endif
 364
 365 static size_t rpc_in(char *ptr, size_t eltsize,
 366                 size_t nmemb, void *buffer_)
 367 {
 368         size_t size = eltsize * nmemb;
 369         struct rpc_state *rpc = buffer_;
 370         write_or_die(rpc->in, ptr, size);
 371         return size;
 372 }
 373
 374 static int run_slot(struct active_request_slot *slot)
 375 {
 376         int err;
 377         struct slot_results results;
 378
 379         slot->results = &results;
 380         slot->curl_result = curl_easy_perform(slot->curl);
 381         finish_active_slot(slot);
 382
 383         err = handle_curl_result(&results);
 384         if (err != HTTP_OK && err != HTTP_REAUTH) {
 385                 error("RPC failed; result=%d, HTTP code = %ld",
 386                       results.curl_result, results.http_code);
 387         }
 388
 389         return err;
 390 }
 391
 392 static int probe_rpc(struct rpc_state *rpc)
 393 {
 394         struct active_request_slot *slot;
 395         struct curl_slist *headers = NULL;
 396         struct strbuf buf = STRBUF_INIT;
 397         int err;
 398
 399         slot = get_active_slot();
 400
 401         headers = curl_slist_append(headers, rpc->hdr_content_type);
 402         headers = curl_slist_append(headers, rpc->hdr_accept);
 403
 404         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 405         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 406         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 407         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 408         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 409         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 410         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 411         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 412         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 413
 414         err = run_slot(slot);
 415
 416         curl_slist_free_all(headers);
 417         strbuf_release(&buf);
 418         return err;
 419 }
 420
 421 static int post_rpc(struct rpc_state *rpc)
 422 {
 423         struct active_request_slot *slot;
 424         struct curl_slist *headers = NULL;
 425         int use_gzip = rpc->gzip_request;
 426         char *gzip_body = NULL;
 427         size_t gzip_size = 0;
 428         int err, large_request = 0;
 429
 430         /* Try to load the entire request, if we can fit it into the
 431          * allocated buffer space we can use HTTP/1.0 and avoid the
 432          * chunked encoding mess.
 433          */
 434         while (1) {
 435                 size_t left = rpc->alloc - rpc->len;
 436                 char *buf = rpc->buf + rpc->len;
 437                 int n;
 438
 439                 if (left < LARGE_PACKET_MAX) {
 440                         large_request = 1;
 441                         use_gzip = 0;
 442                         break;
 443                 }
 444
 445                 n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 446                 if (!n)
 447                         break;
 448                 rpc->len += n;
 449         }
 450
 451         if (large_request) {
 452                 do {
 453                         err = probe_rpc(rpc);
 454                         if (err == HTTP_REAUTH)
 455                                 credential_fill(&http_auth);
 456                 } while (err == HTTP_REAUTH);
 457                 if (err != HTTP_OK)
 458                         return -1;
 459         }
 460
 461         headers = curl_slist_append(headers, rpc->hdr_content_type);
 462         headers = curl_slist_append(headers, rpc->hdr_accept);
 463         headers = curl_slist_append(headers, "Expect:");
 464
 465 retry:
 466         slot = get_active_slot();
 467
 468         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 469         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 470         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 471         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 472
 473         if (large_request) {
 474                 /* The request body is large and the size cannot be predicted.
 475                  * We must use chunked encoding to send it.
 476                  */
 477                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 478                 rpc->initial_buffer = 1;
 479                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 480                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 481 #ifndef NO_CURL_IOCTL
 482                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 483                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 484 #endif
 485                 if (options.verbosity > 1) {
 486                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 487                         fflush(stderr);
 488                 }
 489
 490         } else if (gzip_body) {
 491                 /*
 492                  * If we are looping to retry authentication, then the previous
 493                  * run will have set up the headers and gzip buffer already,
 494                  * and we just need to send it.
 495                  */
 496                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 497                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 498
 499         } else if (use_gzip && 1024 < rpc->len) {
 500                 /* The client backend isn't giving us compressed data so
 501                  * we can try to deflate it ourselves, this may save on.
 502                  * the transfer time.
 503                  */
 504                 git_zstream stream;
 505                 int ret;
 506
 507                 memset(&stream, 0, sizeof(stream));
 508                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 509                 gzip_size = git_deflate_bound(&stream, rpc->len);
 510                 gzip_body = xmalloc(gzip_size);
 511
 512                 stream.next_in = (unsigned char *)rpc->buf;
 513                 stream.avail_in = rpc->len;
 514                 stream.next_out = (unsigned char *)gzip_body;
 515                 stream.avail_out = gzip_size;
 516
 517                 ret = git_deflate(&stream, Z_FINISH);
 518                 if (ret != Z_STREAM_END)
 519                         die("cannot deflate request; zlib deflate error %d", ret);
 520
 521                 ret = git_deflate_end_gently(&stream);
 522                 if (ret != Z_OK)
 523                         die("cannot deflate request; zlib end error %d", ret);
 524
 525                 gzip_size = stream.total_out;
 526
 527                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 528                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 529                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 530
 531                 if (options.verbosity > 1) {
 532                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 533                                 rpc->service_name,
 534                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
 535                         fflush(stderr);
 536                 }
 537         } else {
 538                 /* We know the complete request size in advance, use the
 539                  * more normal Content-Length approach.
 540                  */
 541                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 542                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 543                 if (options.verbosity > 1) {
 544                         fprintf(stderr, "POST %s (%lu bytes)\n",
 545                                 rpc->service_name, (unsigned long)rpc->len);
 546                         fflush(stderr);
 547                 }
 548         }
 549
 550         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 551         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 552         curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 553
 554         err = run_slot(slot);
 555         if (err == HTTP_REAUTH && !large_request) {
 556                 credential_fill(&http_auth);
 557                 goto retry;
 558         }
 559         if (err != HTTP_OK)
 560                 err = -1;
 561
 562         curl_slist_free_all(headers);
 563         free(gzip_body);
 564         return err;
 565 }
 566
 567 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 568 {
 569         const char *svc = rpc->service_name;
 570         struct strbuf buf = STRBUF_INIT;
 571         struct strbuf *preamble = rpc->stdin_preamble;
 572         struct child_process client;
 573         int err = 0;
 574
 575         memset(&client, 0, sizeof(client));
 576         client.in = -1;
 577         client.out = -1;
 578         client.git_cmd = 1;
 579         client.argv = rpc->argv;
 580         if (start_command(&client))
 581                 exit(1);
 582         if (preamble)
 583                 write_or_die(client.in, preamble->buf, preamble->len);
 584         if (heads)
 585                 write_or_die(client.in, heads->buf, heads->len);
 586
 587         rpc->alloc = http_post_buffer;
 588         rpc->buf = xmalloc(rpc->alloc);
 589         rpc->in = client.in;
 590         rpc->out = client.out;
 591         strbuf_init(&rpc->result, 0);
 592
 593         strbuf_addf(&buf, "%s%s", url.buf, svc);
 594         rpc->service_url = strbuf_detach(&buf, NULL);
 595
 596         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 597         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 598
 599         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 600         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 601
 602         while (!err) {
 603                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 604                 if (!n)
 605                         break;
 606                 rpc->pos = 0;
 607                 rpc->len = n;
 608                 err |= post_rpc(rpc);
 609         }
 610
 611         close(client.in);
 612         client.in = -1;
 613         if (!err) {
 614                 strbuf_read(&rpc->result, client.out, 0);
 615         } else {
 616                 char buf[4096];
 617                 for (;;)
 618                         if (xread(client.out, buf, sizeof(buf)) <= 0)
 619                                 break;
 620         }
 621
 622         close(client.out);
 623         client.out = -1;
 624
 625         err |= finish_command(&client);
 626         free(rpc->service_url);
 627         free(rpc->hdr_content_type);
 628         free(rpc->hdr_accept);
 629         free(rpc->buf);
 630         strbuf_release(&buf);
 631         return err;
 632 }
 633
 634 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 635 {
 636         struct walker *walker;
 637         char **targets = xmalloc(nr_heads * sizeof(char*));
 638         int ret, i;
 639
 640         if (options.depth)
 641                 die("dumb http transport does not support --depth");
 642         for (i = 0; i < nr_heads; i++)
 643                 targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 644
 645         walker = get_http_walker(url.buf);
 646         walker->get_all = 1;
 647         walker->get_tree = 1;
 648         walker->get_history = 1;
 649         walker->get_verbosely = options.verbosity >= 3;
 650         walker->get_recover = 0;
 651         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 652         walker_free(walker);
 653
 654         for (i = 0; i < nr_heads; i++)
 655                 free(targets[i]);
 656         free(targets);
 657
 658         return ret ? error("Fetch failed.") : 0;
 659 }
 660
 661 static int fetch_git(struct discovery *heads,
 662         int nr_heads, struct ref **to_fetch)
 663 {
 664         struct rpc_state rpc;
 665         struct strbuf preamble = STRBUF_INIT;
 666         char *depth_arg = NULL;
 667         int argc = 0, i, err;
 668         const char *argv[15];
 669
 670         argv[argc++] = "fetch-pack";
 671         argv[argc++] = "--stateless-rpc";
 672         argv[argc++] = "--stdin";
 673         argv[argc++] = "--lock-pack";
 674         if (options.followtags)
 675                 argv[argc++] = "--include-tag";
 676         if (options.thin)
 677                 argv[argc++] = "--thin";
 678         if (options.verbosity >= 3) {
 679                 argv[argc++] = "-v";
 680                 argv[argc++] = "-v";
 681         }
 682         if (!options.progress)
 683                 argv[argc++] = "--no-progress";
 684         if (options.depth) {
 685                 struct strbuf buf = STRBUF_INIT;
 686                 strbuf_addf(&buf, "--depth=%lu", options.depth);
 687                 depth_arg = strbuf_detach(&buf, NULL);
 688                 argv[argc++] = depth_arg;
 689         }
 690         argv[argc++] = url.buf;
 691         argv[argc++] = NULL;
 692
 693         for (i = 0; i < nr_heads; i++) {
 694                 struct ref *ref = to_fetch[i];
 695                 if (!ref->name || !*ref->name)
 696                         die("cannot fetch by sha1 over smart http");
 697                 packet_buf_write(&preamble, "%s\n", ref->name);
 698         }
 699         packet_buf_flush(&preamble);
 700
 701         memset(&rpc, 0, sizeof(rpc));
 702         rpc.service_name = "git-upload-pack",
 703         rpc.argv = argv;
 704         rpc.stdin_preamble = &preamble;
 705         rpc.gzip_request = 1;
 706
 707         err = rpc_service(&rpc, heads);
 708         if (rpc.result.len)
 709                 write_or_die(1, rpc.result.buf, rpc.result.len);
 710         strbuf_release(&rpc.result);
 711         strbuf_release(&preamble);
 712         free(depth_arg);
 713         return err;
 714 }
 715
 716 static int fetch(int nr_heads, struct ref **to_fetch)
 717 {
 718         struct discovery *d = discover_refs("git-upload-pack", 0);
 719         if (d->proto_git)
 720                 return fetch_git(d, nr_heads, to_fetch);
 721         else
 722                 return fetch_dumb(nr_heads, to_fetch);
 723 }
 724
 725 static void parse_fetch(struct strbuf *buf)
 726 {
 727         struct ref **to_fetch = NULL;
 728         struct ref *list_head = NULL;
 729         struct ref **list = &list_head;
 730         int alloc_heads = 0, nr_heads = 0;
 731
 732         do {
 733                 if (!prefixcmp(buf->buf, "fetch ")) {
 734                         char *p = buf->buf + strlen("fetch ");
 735                         char *name;
 736                         struct ref *ref;
 737                         unsigned char old_sha1[20];
 738
 739                         if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 740                                 die("protocol error: expected sha/ref, got %s'", p);
 741                         if (p[40] == ' ')
 742                                 name = p + 41;
 743                         else if (!p[40])
 744                                 name = "";
 745                         else
 746                                 die("protocol error: expected sha/ref, got %s'", p);
 747
 748                         ref = alloc_ref(name);
 749                         hashcpy(ref->old_sha1, old_sha1);
 750
 751                         *list = ref;
 752                         list = &ref->next;
 753
 754                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 755                         to_fetch[nr_heads++] = ref;
 756                 }
 757                 else
 758                         die("http transport does not support %s", buf->buf);
 759
 760                 strbuf_reset(buf);
 761                 if (strbuf_getline(buf, stdin, '\n') == EOF)
 762                         return;
 763                 if (!*buf->buf)
 764                         break;
 765         } while (1);
 766
 767         if (fetch(nr_heads, to_fetch))
 768                 exit(128); /* error already reported */
 769         free_refs(list_head);
 770         free(to_fetch);
 771
 772         printf("\n");
 773         fflush(stdout);
 774         strbuf_reset(buf);
 775 }
 776
 777 static int push_dav(int nr_spec, char **specs)
 778 {
 779         const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 780         int argc = 0, i;
 781
 782         argv[argc++] = "http-push";
 783         argv[argc++] = "--helper-status";
 784         if (options.dry_run)
 785                 argv[argc++] = "--dry-run";
 786         if (options.verbosity > 1)
 787                 argv[argc++] = "--verbose";
 788         argv[argc++] = url.buf;
 789         for (i = 0; i < nr_spec; i++)
 790                 argv[argc++] = specs[i];
 791         argv[argc++] = NULL;
 792
 793         if (run_command_v_opt(argv, RUN_GIT_CMD))
 794                 die("git-%s failed", argv[0]);
 795         free(argv);
 796         return 0;
 797 }
 798
 799 static int push_git(struct discovery *heads, int nr_spec, char **specs)
 800 {
 801         struct rpc_state rpc;
 802         int i, err;
 803         struct argv_array args;
 804
 805         argv_array_init(&args);
 806         argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 807                          NULL);
 808
 809         if (options.thin)
 810                 argv_array_push(&args, "--thin");
 811         if (options.dry_run)
 812                 argv_array_push(&args, "--dry-run");
 813         if (options.verbosity == 0)
 814                 argv_array_push(&args, "--quiet");
 815         else if (options.verbosity > 1)
 816                 argv_array_push(&args, "--verbose");
 817         argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 818         argv_array_push(&args, url.buf);
 819         for (i = 0; i < nr_spec; i++)
 820                 argv_array_push(&args, specs[i]);
 821
 822         memset(&rpc, 0, sizeof(rpc));
 823         rpc.service_name = "git-receive-pack",
 824         rpc.argv = args.argv;
 825
 826         err = rpc_service(&rpc, heads);
 827         if (rpc.result.len)
 828                 write_or_die(1, rpc.result.buf, rpc.result.len);
 829         strbuf_release(&rpc.result);
 830         argv_array_clear(&args);
 831         return err;
 832 }
 833
 834 static int push(int nr_spec, char **specs)
 835 {
 836         struct discovery *heads = discover_refs("git-receive-pack", 1);
 837         int ret;
 838
 839         if (heads->proto_git)
 840                 ret = push_git(heads, nr_spec, specs);
 841         else
 842                 ret = push_dav(nr_spec, specs);
 843         free_discovery(heads);
 844         return ret;
 845 }
 846
 847 static void parse_push(struct strbuf *buf)
 848 {
 849         char **specs = NULL;
 850         int alloc_spec = 0, nr_spec = 0, i, ret;
 851
 852         do {
 853                 if (!prefixcmp(buf->buf, "push ")) {
 854                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 855                         specs[nr_spec++] = xstrdup(buf->buf + 5);
 856                 }
 857                 else
 858                         die("http transport does not support %s", buf->buf);
 859
 860                 strbuf_reset(buf);
 861                 if (strbuf_getline(buf, stdin, '\n') == EOF)
 862                         goto free_specs;
 863                 if (!*buf->buf)
 864                         break;
 865         } while (1);
 866
 867         ret = push(nr_spec, specs);
 868         printf("\n");
 869         fflush(stdout);
 870
 871         if (ret)
 872                 exit(128); /* error already reported */
 873
 874  free_specs:
 875         for (i = 0; i < nr_spec; i++)
 876                 free(specs[i]);
 877         free(specs);
 878 }
 879
 880 int main(int argc, const char **argv)
 881 {
 882         struct strbuf buf = STRBUF_INIT;
 883         int nongit;
 884
 885         git_extract_argv0_path(argv[0]);
 886         setup_git_directory_gently(&nongit);
 887         if (argc < 2) {
 888                 fprintf(stderr, "Remote needed\n");
 889                 return 1;
 890         }
 891
 892         options.verbosity = 1;
 893         options.progress = !!isatty(2);
 894         options.thin = 1;
 895
 896         remote = remote_get(argv[1]);
 897
 898         if (argc > 2) {
 899                 end_url_with_slash(&url, argv[2]);
 900         } else {
 901                 end_url_with_slash(&url, remote->url[0]);
 902         }
 903
 904         http_init(remote, url.buf, 0);
 905
 906         do {
 907                 if (strbuf_getline(&buf, stdin, '\n') == EOF) {
 908                         if (ferror(stdin))
 909                                 fprintf(stderr, "Error reading command stream\n");
 910                         else
 911                                 fprintf(stderr, "Unexpected end of command stream\n");
 912                         return 1;
 913                 }
 914                 if (buf.len == 0)
 915                         break;
 916                 if (!prefixcmp(buf.buf, "fetch ")) {
 917                         if (nongit)
 918                                 die("Fetch attempted without a local repo");
 919                         parse_fetch(&buf);
 920
 921                 } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
 922                         int for_push = !!strstr(buf.buf + 4, "for-push");
 923                         output_refs(get_refs(for_push));
 924
 925                 } else if (!prefixcmp(buf.buf, "push ")) {
 926                         parse_push(&buf);
 927
 928                 } else if (!prefixcmp(buf.buf, "option ")) {
 929                         char *name = buf.buf + strlen("option ");
 930                         char *value = strchr(name, ' ');
 931                         int result;
 932
 933                         if (value)
 934                                 *value++ = '\0';
 935                         else
 936                                 value = "true";
 937
 938                         result = set_option(name, value);
 939                         if (!result)
 940                                 printf("ok\n");
 941                         else if (result < 0)
 942                                 printf("error invalid value\n");
 943                         else
 944                                 printf("unsupported\n");
 945                         fflush(stdout);
 946
 947                 } else if (!strcmp(buf.buf, "capabilities")) {
 948                         printf("fetch\n");
 949                         printf("option\n");
 950                         printf("push\n");
 951                         printf("\n");
 952                         fflush(stdout);
 953                 } else {
 954                         fprintf(stderr, "Unknown command '%s'\n", buf.buf);
 955                         return 1;
 956                 }
 957                 strbuf_reset(&buf);
 958         } while (1);
 959
 960         http_cleanup();
 961
 962         return 0;
 963 }