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
  12 static struct remote *remote;
  13 static const char *url; /* always ends with a trailing slash */
  14
  15 struct options {
  16         int verbosity;
  17         unsigned long depth;
  18         unsigned progress : 1,
  19                 check_self_contained_and_connected : 1,
  20                 followtags : 1,
  21                 dry_run : 1,
  22                 thin : 1;
  23 };
  24 static struct options options;
  25
  26 static int set_option(const char *name, const char *value)
  27 {
  28         if (!strcmp(name, "verbosity")) {
  29                 char *end;
  30                 int v = strtol(value, &end, 10);
  31                 if (value == end || *end)
  32                         return -1;
  33                 options.verbosity = v;
  34                 return 0;
  35         }
  36         else if (!strcmp(name, "progress")) {
  37                 if (!strcmp(value, "true"))
  38                         options.progress = 1;
  39                 else if (!strcmp(value, "false"))
  40                         options.progress = 0;
  41                 else
  42                         return -1;
  43                 return 0;
  44         }
  45         else if (!strcmp(name, "depth")) {
  46                 char *end;
  47                 unsigned long v = strtoul(value, &end, 10);
  48                 if (value == end || *end)
  49                         return -1;
  50                 options.depth = v;
  51                 return 0;
  52         }
  53         else if (!strcmp(name, "followtags")) {
  54                 if (!strcmp(value, "true"))
  55                         options.followtags = 1;
  56                 else if (!strcmp(value, "false"))
  57                         options.followtags = 0;
  58                 else
  59                         return -1;
  60                 return 0;
  61         }
  62         else if (!strcmp(name, "dry-run")) {
  63                 if (!strcmp(value, "true"))
  64                         options.dry_run = 1;
  65                 else if (!strcmp(value, "false"))
  66                         options.dry_run = 0;
  67                 else
  68                         return -1;
  69                 return 0;
  70         }
  71         else if (!strcmp(name, "check-connectivity")) {
  72                 if (!strcmp(value, "true"))
  73                         options.check_self_contained_and_connected = 1;
  74                 else if (!strcmp(value, "false"))
  75                         options.check_self_contained_and_connected = 0;
  76                 else
  77                         return -1;
  78                 return 0;
  79         }
  80         else {
  81                 return 1 /* unsupported */;
  82         }
  83 }
  84
  85 struct discovery {
  86         const char *service;
  87         char *buf_alloc;
  88         char *buf;
  89         size_t len;
  90         struct ref *refs;
  91         unsigned proto_git : 1;
  92 };
  93 static struct discovery *last_discovery;
  94
  95 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
  96 {
  97         struct ref *list = NULL;
  98         get_remote_heads(-1, heads->buf, heads->len, &list,
  99                          for_push ? REF_NORMAL : 0, NULL);
 100         return list;
 101 }
 102
 103 static struct ref *parse_info_refs(struct discovery *heads)
 104 {
 105         char *data, *start, *mid;
 106         char *ref_name;
 107         int i = 0;
 108
 109         struct ref *refs = NULL;
 110         struct ref *ref = NULL;
 111         struct ref *last_ref = NULL;
 112
 113         data = heads->buf;
 114         start = NULL;
 115         mid = data;
 116         while (i < heads->len) {
 117                 if (!start) {
 118                         start = &data[i];
 119                 }
 120                 if (data[i] == '\t')
 121                         mid = &data[i];
 122                 if (data[i] == '\n') {
 123                         if (mid - start != 40)
 124                                 die("%sinfo/refs not valid: is this a git repository?", url);
 125                         data[i] = 0;
 126                         ref_name = mid + 1;
 127                         ref = xmalloc(sizeof(struct ref) +
 128                                       strlen(ref_name) + 1);
 129                         memset(ref, 0, sizeof(struct ref));
 130                         strcpy(ref->name, ref_name);
 131                         get_sha1_hex(start, ref->old_sha1);
 132                         if (!refs)
 133                                 refs = ref;
 134                         if (last_ref)
 135                                 last_ref->next = ref;
 136                         last_ref = ref;
 137                         start = NULL;
 138                 }
 139                 i++;
 140         }
 141
 142         ref = alloc_ref("HEAD");
 143         if (!http_fetch_ref(url, ref) &&
 144             !resolve_remote_symref(ref, refs)) {
 145                 ref->next = refs;
 146                 refs = ref;
 147         } else {
 148                 free(ref);
 149         }
 150
 151         return refs;
 152 }
 153
 154 static void free_discovery(struct discovery *d)
 155 {
 156         if (d) {
 157                 if (d == last_discovery)
 158                         last_discovery = NULL;
 159                 free(d->buf_alloc);
 160                 free_refs(d->refs);
 161                 free(d);
 162         }
 163 }
 164
 165 static int show_http_message(struct strbuf *type, struct strbuf *msg)
 166 {
 167         const char *p, *eol;
 168
 169         /*
 170          * We only show text/plain parts, as other types are likely
 171          * to be ugly to look at on the user's terminal.
 172          *
 173          * TODO should handle "; charset=XXX", and re-encode into
 174          * logoutputencoding
 175          */
 176         if (strcasecmp(type->buf, "text/plain"))
 177                 return -1;
 178
 179         strbuf_trim(msg);
 180         if (!msg->len)
 181                 return -1;
 182
 183         p = msg->buf;
 184         do {
 185                 eol = strchrnul(p, '\n');
 186                 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 187                 p = eol + 1;
 188         } while(*eol);
 189         return 0;
 190 }
 191
 192 static struct discovery* discover_refs(const char *service, int for_push)
 193 {
 194         struct strbuf exp = STRBUF_INIT;
 195         struct strbuf type = STRBUF_INIT;
 196         struct strbuf buffer = STRBUF_INIT;
 197         struct discovery *last = last_discovery;
 198         char *refs_url;
 199         int http_ret, maybe_smart = 0;
 200
 201         if (last && !strcmp(service, last->service))
 202                 return last;
 203         free_discovery(last);
 204
 205         strbuf_addf(&buffer, "%sinfo/refs", url);
 206         if ((!prefixcmp(url, "http://") || !prefixcmp(url, "https://")) &&
 207              git_env_bool("GIT_SMART_HTTP", 1)) {
 208                 maybe_smart = 1;
 209                 if (!strchr(url, '?'))
 210                         strbuf_addch(&buffer, '?');
 211                 else
 212                         strbuf_addch(&buffer, '&');
 213                 strbuf_addf(&buffer, "service=%s", service);
 214         }
 215         refs_url = strbuf_detach(&buffer, NULL);
 216
 217         http_ret = http_get_strbuf(refs_url, &type, &buffer,
 218                                    HTTP_NO_CACHE | HTTP_KEEP_ERROR);
 219         switch (http_ret) {
 220         case HTTP_OK:
 221                 break;
 222         case HTTP_MISSING_TARGET:
 223                 show_http_message(&type, &buffer);
 224                 die("repository '%s' not found", url);
 225         case HTTP_NOAUTH:
 226                 show_http_message(&type, &buffer);
 227                 die("Authentication failed for '%s'", url);
 228         default:
 229                 show_http_message(&type, &buffer);
 230                 die("unable to access '%s': %s", url, curl_errorstr);
 231         }
 232
 233         last= xcalloc(1, sizeof(*last_discovery));
 234         last->service = service;
 235         last->buf_alloc = strbuf_detach(&buffer, &last->len);
 236         last->buf = last->buf_alloc;
 237
 238         strbuf_addf(&exp, "application/x-%s-advertisement", service);
 239         if (maybe_smart &&
 240             (5 <= last->len && last->buf[4] == '#') &&
 241             !strbuf_cmp(&exp, &type)) {
 242                 char *line;
 243
 244                 /*
 245                  * smart HTTP response; validate that the service
 246                  * pkt-line matches our request.
 247                  */
 248                 line = packet_read_line_buf(&last->buf, &last->len, NULL);
 249
 250                 strbuf_reset(&exp);
 251                 strbuf_addf(&exp, "# service=%s", service);
 252                 if (strcmp(line, exp.buf))
 253                         die("invalid server response; got '%s'", line);
 254                 strbuf_release(&exp);
 255
 256                 /* The header can include additional metadata lines, up
 257                  * until a packet flush marker.  Ignore these now, but
 258                  * in the future we might start to scan them.
 259                  */
 260                 while (packet_read_line_buf(&last->buf, &last->len, NULL))
 261                         ;
 262
 263                 last->proto_git = 1;
 264         }
 265
 266         if (last->proto_git)
 267                 last->refs = parse_git_refs(last, for_push);
 268         else
 269                 last->refs = parse_info_refs(last);
 270
 271         free(refs_url);
 272         strbuf_release(&exp);
 273         strbuf_release(&type);
 274         strbuf_release(&buffer);
 275         last_discovery = last;
 276         return last;
 277 }
 278
 279 static struct ref *get_refs(int for_push)
 280 {
 281         struct discovery *heads;
 282
 283         if (for_push)
 284                 heads = discover_refs("git-receive-pack", for_push);
 285         else
 286                 heads = discover_refs("git-upload-pack", for_push);
 287
 288         return heads->refs;
 289 }
 290
 291 static void output_refs(struct ref *refs)
 292 {
 293         struct ref *posn;
 294         for (posn = refs; posn; posn = posn->next) {
 295                 if (posn->symref)
 296                         printf("@%s %s\n", posn->symref, posn->name);
 297                 else
 298                         printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 299         }
 300         printf("\n");
 301         fflush(stdout);
 302 }
 303
 304 struct rpc_state {
 305         const char *service_name;
 306         const char **argv;
 307         struct strbuf *stdin_preamble;
 308         char *service_url;
 309         char *hdr_content_type;
 310         char *hdr_accept;
 311         char *buf;
 312         size_t alloc;
 313         size_t len;
 314         size_t pos;
 315         int in;
 316         int out;
 317         struct strbuf result;
 318         unsigned gzip_request : 1;
 319         unsigned initial_buffer : 1;
 320 };
 321
 322 static size_t rpc_out(void *ptr, size_t eltsize,
 323                 size_t nmemb, void *buffer_)
 324 {
 325         size_t max = eltsize * nmemb;
 326         struct rpc_state *rpc = buffer_;
 327         size_t avail = rpc->len - rpc->pos;
 328
 329         if (!avail) {
 330                 rpc->initial_buffer = 0;
 331                 avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 332                 if (!avail)
 333                         return 0;
 334                 rpc->pos = 0;
 335                 rpc->len = avail;
 336         }
 337
 338         if (max < avail)
 339                 avail = max;
 340         memcpy(ptr, rpc->buf + rpc->pos, avail);
 341         rpc->pos += avail;
 342         return avail;
 343 }
 344
 345 #ifndef NO_CURL_IOCTL
 346 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 347 {
 348         struct rpc_state *rpc = clientp;
 349
 350         switch (cmd) {
 351         case CURLIOCMD_NOP:
 352                 return CURLIOE_OK;
 353
 354         case CURLIOCMD_RESTARTREAD:
 355                 if (rpc->initial_buffer) {
 356                         rpc->pos = 0;
 357                         return CURLIOE_OK;
 358                 }
 359                 fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
 360                 return CURLIOE_FAILRESTART;
 361
 362         default:
 363                 return CURLIOE_UNKNOWNCMD;
 364         }
 365 }
 366 #endif
 367
 368 static size_t rpc_in(char *ptr, size_t eltsize,
 369                 size_t nmemb, void *buffer_)
 370 {
 371         size_t size = eltsize * nmemb;
 372         struct rpc_state *rpc = buffer_;
 373         write_or_die(rpc->in, ptr, size);
 374         return size;
 375 }
 376
 377 static int run_slot(struct active_request_slot *slot)
 378 {
 379         int err;
 380         struct slot_results results;
 381
 382         slot->results = &results;
 383         slot->curl_result = curl_easy_perform(slot->curl);
 384         finish_active_slot(slot);
 385
 386         err = handle_curl_result(&results);
 387         if (err != HTTP_OK && err != HTTP_REAUTH) {
 388                 error("RPC failed; result=%d, HTTP code = %ld",
 389                       results.curl_result, results.http_code);
 390         }
 391
 392         return err;
 393 }
 394
 395 static int probe_rpc(struct rpc_state *rpc)
 396 {
 397         struct active_request_slot *slot;
 398         struct curl_slist *headers = NULL;
 399         struct strbuf buf = STRBUF_INIT;
 400         int err;
 401
 402         slot = get_active_slot();
 403
 404         headers = curl_slist_append(headers, rpc->hdr_content_type);
 405         headers = curl_slist_append(headers, rpc->hdr_accept);
 406
 407         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 408         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 409         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 410         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 411         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 412         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 413         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 414         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 415         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 416
 417         err = run_slot(slot);
 418
 419         curl_slist_free_all(headers);
 420         strbuf_release(&buf);
 421         return err;
 422 }
 423
 424 static int post_rpc(struct rpc_state *rpc)
 425 {
 426         struct active_request_slot *slot;
 427         struct curl_slist *headers = NULL;
 428         int use_gzip = rpc->gzip_request;
 429         char *gzip_body = NULL;
 430         size_t gzip_size = 0;
 431         int err, large_request = 0;
 432
 433         /* Try to load the entire request, if we can fit it into the
 434          * allocated buffer space we can use HTTP/1.0 and avoid the
 435          * chunked encoding mess.
 436          */
 437         while (1) {
 438                 size_t left = rpc->alloc - rpc->len;
 439                 char *buf = rpc->buf + rpc->len;
 440                 int n;
 441
 442                 if (left < LARGE_PACKET_MAX) {
 443                         large_request = 1;
 444                         use_gzip = 0;
 445                         break;
 446                 }
 447
 448                 n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 449                 if (!n)
 450                         break;
 451                 rpc->len += n;
 452         }
 453
 454         if (large_request) {
 455                 do {
 456                         err = probe_rpc(rpc);
 457                 } while (err == HTTP_REAUTH);
 458                 if (err != HTTP_OK)
 459                         return -1;
 460         }
 461
 462         headers = curl_slist_append(headers, rpc->hdr_content_type);
 463         headers = curl_slist_append(headers, rpc->hdr_accept);
 464         headers = curl_slist_append(headers, "Expect:");
 465
 466 retry:
 467         slot = get_active_slot();
 468
 469         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 470         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 471         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 472         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 473
 474         if (large_request) {
 475                 /* The request body is large and the size cannot be predicted.
 476                  * We must use chunked encoding to send it.
 477                  */
 478                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 479                 rpc->initial_buffer = 1;
 480                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 481                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 482 #ifndef NO_CURL_IOCTL
 483                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 484                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 485 #endif
 486                 if (options.verbosity > 1) {
 487                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 488                         fflush(stderr);
 489                 }
 490
 491         } else if (gzip_body) {
 492                 /*
 493                  * If we are looping to retry authentication, then the previous
 494                  * run will have set up the headers and gzip buffer already,
 495                  * and we just need to send it.
 496                  */
 497                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 498                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 499
 500         } else if (use_gzip && 1024 < rpc->len) {
 501                 /* The client backend isn't giving us compressed data so
 502                  * we can try to deflate it ourselves, this may save on.
 503                  * the transfer time.
 504                  */
 505                 git_zstream stream;
 506                 int ret;
 507
 508                 memset(&stream, 0, sizeof(stream));
 509                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 510                 gzip_size = git_deflate_bound(&stream, rpc->len);
 511                 gzip_body = xmalloc(gzip_size);
 512
 513                 stream.next_in = (unsigned char *)rpc->buf;
 514                 stream.avail_in = rpc->len;
 515                 stream.next_out = (unsigned char *)gzip_body;
 516                 stream.avail_out = gzip_size;
 517
 518                 ret = git_deflate(&stream, Z_FINISH);
 519                 if (ret != Z_STREAM_END)
 520                         die("cannot deflate request; zlib deflate error %d", ret);
 521
 522                 ret = git_deflate_end_gently(&stream);
 523                 if (ret != Z_OK)
 524                         die("cannot deflate request; zlib end error %d", ret);
 525
 526                 gzip_size = stream.total_out;
 527
 528                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 529                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 530                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 531
 532                 if (options.verbosity > 1) {
 533                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 534                                 rpc->service_name,
 535                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
 536                         fflush(stderr);
 537                 }
 538         } else {
 539                 /* We know the complete request size in advance, use the
 540                  * more normal Content-Length approach.
 541                  */
 542                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 543                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 544                 if (options.verbosity > 1) {
 545                         fprintf(stderr, "POST %s (%lu bytes)\n",
 546                                 rpc->service_name, (unsigned long)rpc->len);
 547                         fflush(stderr);
 548                 }
 549         }
 550
 551         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 552         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 553         curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 554
 555         err = run_slot(slot);
 556         if (err == HTTP_REAUTH && !large_request)
 557                 goto retry;
 558         if (err != HTTP_OK)
 559                 err = -1;
 560
 561         curl_slist_free_all(headers);
 562         free(gzip_body);
 563         return err;
 564 }
 565
 566 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 567 {
 568         const char *svc = rpc->service_name;
 569         struct strbuf buf = STRBUF_INIT;
 570         struct strbuf *preamble = rpc->stdin_preamble;
 571         struct child_process client;
 572         int err = 0;
 573
 574         memset(&client, 0, sizeof(client));
 575         client.in = -1;
 576         client.out = -1;
 577         client.git_cmd = 1;
 578         client.argv = rpc->argv;
 579         if (start_command(&client))
 580                 exit(1);
 581         if (preamble)
 582                 write_or_die(client.in, preamble->buf, preamble->len);
 583         if (heads)
 584                 write_or_die(client.in, heads->buf, heads->len);
 585
 586         rpc->alloc = http_post_buffer;
 587         rpc->buf = xmalloc(rpc->alloc);
 588         rpc->in = client.in;
 589         rpc->out = client.out;
 590         strbuf_init(&rpc->result, 0);
 591
 592         strbuf_addf(&buf, "%s%s", url, svc);
 593         rpc->service_url = strbuf_detach(&buf, NULL);
 594
 595         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 596         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 597
 598         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 599         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 600
 601         while (!err) {
 602                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 603                 if (!n)
 604                         break;
 605                 rpc->pos = 0;
 606                 rpc->len = n;
 607                 err |= post_rpc(rpc);
 608         }
 609
 610         close(client.in);
 611         client.in = -1;
 612         if (!err) {
 613                 strbuf_read(&rpc->result, client.out, 0);
 614         } else {
 615                 char buf[4096];
 616                 for (;;)
 617                         if (xread(client.out, buf, sizeof(buf)) <= 0)
 618                                 break;
 619         }
 620
 621         close(client.out);
 622         client.out = -1;
 623
 624         err |= finish_command(&client);
 625         free(rpc->service_url);
 626         free(rpc->hdr_content_type);
 627         free(rpc->hdr_accept);
 628         free(rpc->buf);
 629         strbuf_release(&buf);
 630         return err;
 631 }
 632
 633 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 634 {
 635         struct walker *walker;
 636         char **targets = xmalloc(nr_heads * sizeof(char*));
 637         int ret, i;
 638
 639         if (options.depth)
 640                 die("dumb http transport does not support --depth");
 641         for (i = 0; i < nr_heads; i++)
 642                 targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 643
 644         walker = get_http_walker(url);
 645         walker->get_all = 1;
 646         walker->get_tree = 1;
 647         walker->get_history = 1;
 648         walker->get_verbosely = options.verbosity >= 3;
 649         walker->get_recover = 0;
 650         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 651         walker_free(walker);
 652
 653         for (i = 0; i < nr_heads; i++)
 654                 free(targets[i]);
 655         free(targets);
 656
 657         return ret ? error("Fetch failed.") : 0;
 658 }
 659
 660 static int fetch_git(struct discovery *heads,
 661         int nr_heads, struct ref **to_fetch)
 662 {
 663         struct rpc_state rpc;
 664         struct strbuf preamble = STRBUF_INIT;
 665         char *depth_arg = NULL;
 666         int argc = 0, i, err;
 667         const char *argv[16];
 668
 669         argv[argc++] = "fetch-pack";
 670         argv[argc++] = "--stateless-rpc";
 671         argv[argc++] = "--stdin";
 672         argv[argc++] = "--lock-pack";
 673         if (options.followtags)
 674                 argv[argc++] = "--include-tag";
 675         if (options.thin)
 676                 argv[argc++] = "--thin";
 677         if (options.verbosity >= 3) {
 678                 argv[argc++] = "-v";
 679                 argv[argc++] = "-v";
 680         }
 681         if (options.check_self_contained_and_connected)
 682                 argv[argc++] = "--check-self-contained-and-connected";
 683         if (!options.progress)
 684                 argv[argc++] = "--no-progress";
 685         if (options.depth) {
 686                 struct strbuf buf = STRBUF_INIT;
 687                 strbuf_addf(&buf, "--depth=%lu", options.depth);
 688                 depth_arg = strbuf_detach(&buf, NULL);
 689                 argv[argc++] = depth_arg;
 690         }
 691         argv[argc++] = url;
 692         argv[argc++] = NULL;
 693
 694         for (i = 0; i < nr_heads; i++) {
 695                 struct ref *ref = to_fetch[i];
 696                 if (!ref->name || !*ref->name)
 697                         die("cannot fetch by sha1 over smart http");
 698                 packet_buf_write(&preamble, "%s\n", ref->name);
 699         }
 700         packet_buf_flush(&preamble);
 701
 702         memset(&rpc, 0, sizeof(rpc));
 703         rpc.service_name = "git-upload-pack",
 704         rpc.argv = argv;
 705         rpc.stdin_preamble = &preamble;
 706         rpc.gzip_request = 1;
 707
 708         err = rpc_service(&rpc, heads);
 709         if (rpc.result.len)
 710                 write_or_die(1, rpc.result.buf, rpc.result.len);
 711         strbuf_release(&rpc.result);
 712         strbuf_release(&preamble);
 713         free(depth_arg);
 714         return err;
 715 }
 716
 717 static int fetch(int nr_heads, struct ref **to_fetch)
 718 {
 719         struct discovery *d = discover_refs("git-upload-pack", 0);
 720         if (d->proto_git)
 721                 return fetch_git(d, nr_heads, to_fetch);
 722         else
 723                 return fetch_dumb(nr_heads, to_fetch);
 724 }
 725
 726 static void parse_fetch(struct strbuf *buf)
 727 {
 728         struct ref **to_fetch = NULL;
 729         struct ref *list_head = NULL;
 730         struct ref **list = &list_head;
 731         int alloc_heads = 0, nr_heads = 0;
 732
 733         do {
 734                 if (!prefixcmp(buf->buf, "fetch ")) {
 735                         char *p = buf->buf + strlen("fetch ");
 736                         char *name;
 737                         struct ref *ref;
 738                         unsigned char old_sha1[20];
 739
 740                         if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 741                                 die("protocol error: expected sha/ref, got %s'", p);
 742                         if (p[40] == ' ')
 743                                 name = p + 41;
 744                         else if (!p[40])
 745                                 name = "";
 746                         else
 747                                 die("protocol error: expected sha/ref, got %s'", p);
 748
 749                         ref = alloc_ref(name);
 750                         hashcpy(ref->old_sha1, old_sha1);
 751
 752                         *list = ref;
 753                         list = &ref->next;
 754
 755                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 756                         to_fetch[nr_heads++] = ref;
 757                 }
 758                 else
 759                         die("http transport does not support %s", buf->buf);
 760
 761                 strbuf_reset(buf);
 762                 if (strbuf_getline(buf, stdin, '\n') == EOF)
 763                         return;
 764                 if (!*buf->buf)
 765                         break;
 766         } while (1);
 767
 768         if (fetch(nr_heads, to_fetch))
 769                 exit(128); /* error already reported */
 770         free_refs(list_head);
 771         free(to_fetch);
 772
 773         printf("\n");
 774         fflush(stdout);
 775         strbuf_reset(buf);
 776 }
 777
 778 static int push_dav(int nr_spec, char **specs)
 779 {
 780         const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 781         int argc = 0, i;
 782
 783         argv[argc++] = "http-push";
 784         argv[argc++] = "--helper-status";
 785         if (options.dry_run)
 786                 argv[argc++] = "--dry-run";
 787         if (options.verbosity > 1)
 788                 argv[argc++] = "--verbose";
 789         argv[argc++] = url;
 790         for (i = 0; i < nr_spec; i++)
 791                 argv[argc++] = specs[i];
 792         argv[argc++] = NULL;
 793
 794         if (run_command_v_opt(argv, RUN_GIT_CMD))
 795                 die("git-%s failed", argv[0]);
 796         free(argv);
 797         return 0;
 798 }
 799
 800 static int push_git(struct discovery *heads, int nr_spec, char **specs)
 801 {
 802         struct rpc_state rpc;
 803         int i, err;
 804         struct argv_array args;
 805
 806         argv_array_init(&args);
 807         argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 808                          NULL);
 809
 810         if (options.thin)
 811                 argv_array_push(&args, "--thin");
 812         if (options.dry_run)
 813                 argv_array_push(&args, "--dry-run");
 814         if (options.verbosity == 0)
 815                 argv_array_push(&args, "--quiet");
 816         else if (options.verbosity > 1)
 817                 argv_array_push(&args, "--verbose");
 818         argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 819         argv_array_push(&args, url);
 820         for (i = 0; i < nr_spec; i++)
 821                 argv_array_push(&args, specs[i]);
 822
 823         memset(&rpc, 0, sizeof(rpc));
 824         rpc.service_name = "git-receive-pack",
 825         rpc.argv = args.argv;
 826
 827         err = rpc_service(&rpc, heads);
 828         if (rpc.result.len)
 829                 write_or_die(1, rpc.result.buf, rpc.result.len);
 830         strbuf_release(&rpc.result);
 831         argv_array_clear(&args);
 832         return err;
 833 }
 834
 835 static int push(int nr_spec, char **specs)
 836 {
 837         struct discovery *heads = discover_refs("git-receive-pack", 1);
 838         int ret;
 839
 840         if (heads->proto_git)
 841                 ret = push_git(heads, nr_spec, specs);
 842         else
 843                 ret = push_dav(nr_spec, specs);
 844         free_discovery(heads);
 845         return ret;
 846 }
 847
 848 static void parse_push(struct strbuf *buf)
 849 {
 850         char **specs = NULL;
 851         int alloc_spec = 0, nr_spec = 0, i, ret;
 852
 853         do {
 854                 if (!prefixcmp(buf->buf, "push ")) {
 855                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 856                         specs[nr_spec++] = xstrdup(buf->buf + 5);
 857                 }
 858                 else
 859                         die("http transport does not support %s", buf->buf);
 860
 861                 strbuf_reset(buf);
 862                 if (strbuf_getline(buf, stdin, '\n') == EOF)
 863                         goto free_specs;
 864                 if (!*buf->buf)
 865                         break;
 866         } while (1);
 867
 868         ret = push(nr_spec, specs);
 869         printf("\n");
 870         fflush(stdout);
 871
 872         if (ret)
 873                 exit(128); /* error already reported */
 874
 875  free_specs:
 876         for (i = 0; i < nr_spec; i++)
 877                 free(specs[i]);
 878         free(specs);
 879 }
 880
 881 int main(int argc, const char **argv)
 882 {
 883         struct strbuf buf = STRBUF_INIT;
 884         int nongit;
 885
 886         git_extract_argv0_path(argv[0]);
 887         setup_git_directory_gently(&nongit);
 888         if (argc < 2) {
 889                 fprintf(stderr, "Remote needed\n");
 890                 return 1;
 891         }
 892
 893         options.verbosity = 1;
 894         options.progress = !!isatty(2);
 895         options.thin = 1;
 896
 897         remote = remote_get(argv[1]);
 898
 899         if (argc > 2) {
 900                 end_url_with_slash(&buf, argv[2]);
 901         } else {
 902                 end_url_with_slash(&buf, remote->url[0]);
 903         }
 904
 905         url = strbuf_detach(&buf, NULL);
 906
 907         http_init(remote, url, 0);
 908
 909         do {
 910                 if (strbuf_getline(&buf, stdin, '\n') == EOF) {
 911                         if (ferror(stdin))
 912                                 fprintf(stderr, "Error reading command stream\n");
 913                         else
 914                                 fprintf(stderr, "Unexpected end of command stream\n");
 915                         return 1;
 916                 }
 917                 if (buf.len == 0)
 918                         break;
 919                 if (!prefixcmp(buf.buf, "fetch ")) {
 920                         if (nongit)
 921                                 die("Fetch attempted without a local repo");
 922                         parse_fetch(&buf);
 923
 924                 } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
 925                         int for_push = !!strstr(buf.buf + 4, "for-push");
 926                         output_refs(get_refs(for_push));
 927
 928                 } else if (!prefixcmp(buf.buf, "push ")) {
 929                         parse_push(&buf);
 930
 931                 } else if (!prefixcmp(buf.buf, "option ")) {
 932                         char *name = buf.buf + strlen("option ");
 933                         char *value = strchr(name, ' ');
 934                         int result;
 935
 936                         if (value)
 937                                 *value++ = '\0';
 938                         else
 939                                 value = "true";
 940
 941                         result = set_option(name, value);
 942                         if (!result)
 943                                 printf("ok\n");
 944                         else if (result < 0)
 945                                 printf("error invalid value\n");
 946                         else
 947                                 printf("unsupported\n");
 948                         fflush(stdout);
 949
 950                 } else if (!strcmp(buf.buf, "capabilities")) {
 951                         printf("fetch\n");
 952                         printf("option\n");
 953                         printf("push\n");
 954                         printf("check-connectivity\n");
 955                         printf("\n");
 956                         fflush(stdout);
 957                 } else {
 958                         fprintf(stderr, "Unknown command '%s'\n", buf.buf);
 959                         return 1;
 960                 }
 961                 strbuf_reset(&buf);
 962         } while (1);
 963
 964         http_cleanup();
 965
 966         return 0;
 967 }