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 "string-list.h"
  10 #include "sideband.h"
  11 #include "argv-array.h"
  12
  13 static struct remote *remote;
  14 static const char *url; /* always ends with a trailing slash */
  15
  16 struct options {
  17         int verbosity;
  18         unsigned long depth;
  19         unsigned progress : 1,
  20                 check_self_contained_and_connected : 1,
  21                 followtags : 1,
  22                 dry_run : 1,
  23                 thin : 1;
  24 };
  25 static struct options options;
  26 static struct string_list cas_options = STRING_LIST_INIT_DUP;
  27
  28 static int set_option(const char *name, const char *value)
  29 {
  30         if (!strcmp(name, "verbosity")) {
  31                 char *end;
  32                 int v = strtol(value, &end, 10);
  33                 if (value == end || *end)
  34                         return -1;
  35                 options.verbosity = v;
  36                 return 0;
  37         }
  38         else if (!strcmp(name, "progress")) {
  39                 if (!strcmp(value, "true"))
  40                         options.progress = 1;
  41                 else if (!strcmp(value, "false"))
  42                         options.progress = 0;
  43                 else
  44                         return -1;
  45                 return 0;
  46         }
  47         else if (!strcmp(name, "depth")) {
  48                 char *end;
  49                 unsigned long v = strtoul(value, &end, 10);
  50                 if (value == end || *end)
  51                         return -1;
  52                 options.depth = v;
  53                 return 0;
  54         }
  55         else if (!strcmp(name, "followtags")) {
  56                 if (!strcmp(value, "true"))
  57                         options.followtags = 1;
  58                 else if (!strcmp(value, "false"))
  59                         options.followtags = 0;
  60                 else
  61                         return -1;
  62                 return 0;
  63         }
  64         else if (!strcmp(name, "dry-run")) {
  65                 if (!strcmp(value, "true"))
  66                         options.dry_run = 1;
  67                 else if (!strcmp(value, "false"))
  68                         options.dry_run = 0;
  69                 else
  70                         return -1;
  71                 return 0;
  72         }
  73         else if (!strcmp(name, "check-connectivity")) {
  74                 if (!strcmp(value, "true"))
  75                         options.check_self_contained_and_connected = 1;
  76                 else if (!strcmp(value, "false"))
  77                         options.check_self_contained_and_connected = 0;
  78                 else
  79                         return -1;
  80                 return 0;
  81         }
  82         else if (!strcmp(name, "cas")) {
  83                 struct strbuf val = STRBUF_INIT;
  84                 strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
  85                 string_list_append(&cas_options, val.buf);
  86                 strbuf_release(&val);
  87                 return 0;
  88         }
  89         else {
  90                 return 1 /* unsupported */;
  91         }
  92 }
  93
  94 struct discovery {
  95         const char *service;
  96         char *buf_alloc;
  97         char *buf;
  98         size_t len;
  99         struct ref *refs;
 100         unsigned proto_git : 1;
 101 };
 102 static struct discovery *last_discovery;
 103
 104 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 105 {
 106         struct ref *list = NULL;
 107         get_remote_heads(-1, heads->buf, heads->len, &list,
 108                          for_push ? REF_NORMAL : 0, NULL);
 109         return list;
 110 }
 111
 112 static struct ref *parse_info_refs(struct discovery *heads)
 113 {
 114         char *data, *start, *mid;
 115         char *ref_name;
 116         int i = 0;
 117
 118         struct ref *refs = NULL;
 119         struct ref *ref = NULL;
 120         struct ref *last_ref = NULL;
 121
 122         data = heads->buf;
 123         start = NULL;
 124         mid = data;
 125         while (i < heads->len) {
 126                 if (!start) {
 127                         start = &data[i];
 128                 }
 129                 if (data[i] == '\t')
 130                         mid = &data[i];
 131                 if (data[i] == '\n') {
 132                         if (mid - start != 40)
 133                                 die("%sinfo/refs not valid: is this a git repository?", url);
 134                         data[i] = 0;
 135                         ref_name = mid + 1;
 136                         ref = xmalloc(sizeof(struct ref) +
 137                                       strlen(ref_name) + 1);
 138                         memset(ref, 0, sizeof(struct ref));
 139                         strcpy(ref->name, ref_name);
 140                         get_sha1_hex(start, ref->old_sha1);
 141                         if (!refs)
 142                                 refs = ref;
 143                         if (last_ref)
 144                                 last_ref->next = ref;
 145                         last_ref = ref;
 146                         start = NULL;
 147                 }
 148                 i++;
 149         }
 150
 151         ref = alloc_ref("HEAD");
 152         if (!http_fetch_ref(url, ref) &&
 153             !resolve_remote_symref(ref, refs)) {
 154                 ref->next = refs;
 155                 refs = ref;
 156         } else {
 157                 free(ref);
 158         }
 159
 160         return refs;
 161 }
 162
 163 static void free_discovery(struct discovery *d)
 164 {
 165         if (d) {
 166                 if (d == last_discovery)
 167                         last_discovery = NULL;
 168                 free(d->buf_alloc);
 169                 free_refs(d->refs);
 170                 free(d);
 171         }
 172 }
 173
 174 static int show_http_message(struct strbuf *type, struct strbuf *msg)
 175 {
 176         const char *p, *eol;
 177
 178         /*
 179          * We only show text/plain parts, as other types are likely
 180          * to be ugly to look at on the user's terminal.
 181          *
 182          * TODO should handle "; charset=XXX", and re-encode into
 183          * logoutputencoding
 184          */
 185         if (strcasecmp(type->buf, "text/plain"))
 186                 return -1;
 187
 188         strbuf_trim(msg);
 189         if (!msg->len)
 190                 return -1;
 191
 192         p = msg->buf;
 193         do {
 194                 eol = strchrnul(p, '\n');
 195                 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 196                 p = eol + 1;
 197         } while(*eol);
 198         return 0;
 199 }
 200
 201 static struct discovery* discover_refs(const char *service, int for_push)
 202 {
 203         struct strbuf exp = STRBUF_INIT;
 204         struct strbuf type = STRBUF_INIT;
 205         struct strbuf buffer = STRBUF_INIT;
 206         struct discovery *last = last_discovery;
 207         char *refs_url;
 208         int http_ret, maybe_smart = 0;
 209
 210         if (last && !strcmp(service, last->service))
 211                 return last;
 212         free_discovery(last);
 213
 214         strbuf_addf(&buffer, "%sinfo/refs", url);
 215         if ((!prefixcmp(url, "http://") || !prefixcmp(url, "https://")) &&
 216              git_env_bool("GIT_SMART_HTTP", 1)) {
 217                 maybe_smart = 1;
 218                 if (!strchr(url, '?'))
 219                         strbuf_addch(&buffer, '?');
 220                 else
 221                         strbuf_addch(&buffer, '&');
 222                 strbuf_addf(&buffer, "service=%s", service);
 223         }
 224         refs_url = strbuf_detach(&buffer, NULL);
 225
 226         http_ret = http_get_strbuf(refs_url, &type, &buffer,
 227                                    HTTP_NO_CACHE | HTTP_KEEP_ERROR);
 228         switch (http_ret) {
 229         case HTTP_OK:
 230                 break;
 231         case HTTP_MISSING_TARGET:
 232                 show_http_message(&type, &buffer);
 233                 die("repository '%s' not found", url);
 234         case HTTP_NOAUTH:
 235                 show_http_message(&type, &buffer);
 236                 die("Authentication failed for '%s'", url);
 237         default:
 238                 show_http_message(&type, &buffer);
 239                 die("unable to access '%s': %s", url, curl_errorstr);
 240         }
 241
 242         last= xcalloc(1, sizeof(*last_discovery));
 243         last->service = service;
 244         last->buf_alloc = strbuf_detach(&buffer, &last->len);
 245         last->buf = last->buf_alloc;
 246
 247         strbuf_addf(&exp, "application/x-%s-advertisement", service);
 248         if (maybe_smart &&
 249             (5 <= last->len && last->buf[4] == '#') &&
 250             !strbuf_cmp(&exp, &type)) {
 251                 char *line;
 252
 253                 /*
 254                  * smart HTTP response; validate that the service
 255                  * pkt-line matches our request.
 256                  */
 257                 line = packet_read_line_buf(&last->buf, &last->len, NULL);
 258
 259                 strbuf_reset(&exp);
 260                 strbuf_addf(&exp, "# service=%s", service);
 261                 if (strcmp(line, exp.buf))
 262                         die("invalid server response; got '%s'", line);
 263                 strbuf_release(&exp);
 264
 265                 /* The header can include additional metadata lines, up
 266                  * until a packet flush marker.  Ignore these now, but
 267                  * in the future we might start to scan them.
 268                  */
 269                 while (packet_read_line_buf(&last->buf, &last->len, NULL))
 270                         ;
 271
 272                 last->proto_git = 1;
 273         }
 274
 275         if (last->proto_git)
 276                 last->refs = parse_git_refs(last, for_push);
 277         else
 278                 last->refs = parse_info_refs(last);
 279
 280         free(refs_url);
 281         strbuf_release(&exp);
 282         strbuf_release(&type);
 283         strbuf_release(&buffer);
 284         last_discovery = last;
 285         return last;
 286 }
 287
 288 static struct ref *get_refs(int for_push)
 289 {
 290         struct discovery *heads;
 291
 292         if (for_push)
 293                 heads = discover_refs("git-receive-pack", for_push);
 294         else
 295                 heads = discover_refs("git-upload-pack", for_push);
 296
 297         return heads->refs;
 298 }
 299
 300 static void output_refs(struct ref *refs)
 301 {
 302         struct ref *posn;
 303         for (posn = refs; posn; posn = posn->next) {
 304                 if (posn->symref)
 305                         printf("@%s %s\n", posn->symref, posn->name);
 306                 else
 307                         printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 308         }
 309         printf("\n");
 310         fflush(stdout);
 311 }
 312
 313 struct rpc_state {
 314         const char *service_name;
 315         const char **argv;
 316         struct strbuf *stdin_preamble;
 317         char *service_url;
 318         char *hdr_content_type;
 319         char *hdr_accept;
 320         char *buf;
 321         size_t alloc;
 322         size_t len;
 323         size_t pos;
 324         int in;
 325         int out;
 326         struct strbuf result;
 327         unsigned gzip_request : 1;
 328         unsigned initial_buffer : 1;
 329 };
 330
 331 static size_t rpc_out(void *ptr, size_t eltsize,
 332                 size_t nmemb, void *buffer_)
 333 {
 334         size_t max = eltsize * nmemb;
 335         struct rpc_state *rpc = buffer_;
 336         size_t avail = rpc->len - rpc->pos;
 337
 338         if (!avail) {
 339                 rpc->initial_buffer = 0;
 340                 avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 341                 if (!avail)
 342                         return 0;
 343                 rpc->pos = 0;
 344                 rpc->len = avail;
 345         }
 346
 347         if (max < avail)
 348                 avail = max;
 349         memcpy(ptr, rpc->buf + rpc->pos, avail);
 350         rpc->pos += avail;
 351         return avail;
 352 }
 353
 354 #ifndef NO_CURL_IOCTL
 355 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 356 {
 357         struct rpc_state *rpc = clientp;
 358
 359         switch (cmd) {
 360         case CURLIOCMD_NOP:
 361                 return CURLIOE_OK;
 362
 363         case CURLIOCMD_RESTARTREAD:
 364                 if (rpc->initial_buffer) {
 365                         rpc->pos = 0;
 366                         return CURLIOE_OK;
 367                 }
 368                 fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
 369                 return CURLIOE_FAILRESTART;
 370
 371         default:
 372                 return CURLIOE_UNKNOWNCMD;
 373         }
 374 }
 375 #endif
 376
 377 static size_t rpc_in(char *ptr, size_t eltsize,
 378                 size_t nmemb, void *buffer_)
 379 {
 380         size_t size = eltsize * nmemb;
 381         struct rpc_state *rpc = buffer_;
 382         write_or_die(rpc->in, ptr, size);
 383         return size;
 384 }
 385
 386 static int run_slot(struct active_request_slot *slot)
 387 {
 388         int err;
 389         struct slot_results results;
 390
 391         slot->results = &results;
 392         slot->curl_result = curl_easy_perform(slot->curl);
 393         finish_active_slot(slot);
 394
 395         err = handle_curl_result(&results);
 396         if (err != HTTP_OK && err != HTTP_REAUTH) {
 397                 error("RPC failed; result=%d, HTTP code = %ld",
 398                       results.curl_result, results.http_code);
 399         }
 400
 401         return err;
 402 }
 403
 404 static int probe_rpc(struct rpc_state *rpc)
 405 {
 406         struct active_request_slot *slot;
 407         struct curl_slist *headers = NULL;
 408         struct strbuf buf = STRBUF_INIT;
 409         int err;
 410
 411         slot = get_active_slot();
 412
 413         headers = curl_slist_append(headers, rpc->hdr_content_type);
 414         headers = curl_slist_append(headers, rpc->hdr_accept);
 415
 416         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 417         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 418         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 419         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 420         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 421         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 422         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 423         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 424         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 425
 426         err = run_slot(slot);
 427
 428         curl_slist_free_all(headers);
 429         strbuf_release(&buf);
 430         return err;
 431 }
 432
 433 static int post_rpc(struct rpc_state *rpc)
 434 {
 435         struct active_request_slot *slot;
 436         struct curl_slist *headers = NULL;
 437         int use_gzip = rpc->gzip_request;
 438         char *gzip_body = NULL;
 439         size_t gzip_size = 0;
 440         int err, large_request = 0;
 441
 442         /* Try to load the entire request, if we can fit it into the
 443          * allocated buffer space we can use HTTP/1.0 and avoid the
 444          * chunked encoding mess.
 445          */
 446         while (1) {
 447                 size_t left = rpc->alloc - rpc->len;
 448                 char *buf = rpc->buf + rpc->len;
 449                 int n;
 450
 451                 if (left < LARGE_PACKET_MAX) {
 452                         large_request = 1;
 453                         use_gzip = 0;
 454                         break;
 455                 }
 456
 457                 n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 458                 if (!n)
 459                         break;
 460                 rpc->len += n;
 461         }
 462
 463         if (large_request) {
 464                 do {
 465                         err = probe_rpc(rpc);
 466                 } while (err == HTTP_REAUTH);
 467                 if (err != HTTP_OK)
 468                         return -1;
 469         }
 470
 471         headers = curl_slist_append(headers, rpc->hdr_content_type);
 472         headers = curl_slist_append(headers, rpc->hdr_accept);
 473         headers = curl_slist_append(headers, "Expect:");
 474
 475 retry:
 476         slot = get_active_slot();
 477
 478         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 479         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 480         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 481         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 482
 483         if (large_request) {
 484                 /* The request body is large and the size cannot be predicted.
 485                  * We must use chunked encoding to send it.
 486                  */
 487                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 488                 rpc->initial_buffer = 1;
 489                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 490                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 491 #ifndef NO_CURL_IOCTL
 492                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 493                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 494 #endif
 495                 if (options.verbosity > 1) {
 496                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 497                         fflush(stderr);
 498                 }
 499
 500         } else if (gzip_body) {
 501                 /*
 502                  * If we are looping to retry authentication, then the previous
 503                  * run will have set up the headers and gzip buffer already,
 504                  * and we just need to send it.
 505                  */
 506                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 507                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 508
 509         } else if (use_gzip && 1024 < rpc->len) {
 510                 /* The client backend isn't giving us compressed data so
 511                  * we can try to deflate it ourselves, this may save on.
 512                  * the transfer time.
 513                  */
 514                 git_zstream stream;
 515                 int ret;
 516
 517                 memset(&stream, 0, sizeof(stream));
 518                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 519                 gzip_size = git_deflate_bound(&stream, rpc->len);
 520                 gzip_body = xmalloc(gzip_size);
 521
 522                 stream.next_in = (unsigned char *)rpc->buf;
 523                 stream.avail_in = rpc->len;
 524                 stream.next_out = (unsigned char *)gzip_body;
 525                 stream.avail_out = gzip_size;
 526
 527                 ret = git_deflate(&stream, Z_FINISH);
 528                 if (ret != Z_STREAM_END)
 529                         die("cannot deflate request; zlib deflate error %d", ret);
 530
 531                 ret = git_deflate_end_gently(&stream);
 532                 if (ret != Z_OK)
 533                         die("cannot deflate request; zlib end error %d", ret);
 534
 535                 gzip_size = stream.total_out;
 536
 537                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 538                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 539                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 540
 541                 if (options.verbosity > 1) {
 542                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 543                                 rpc->service_name,
 544                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
 545                         fflush(stderr);
 546                 }
 547         } else {
 548                 /* We know the complete request size in advance, use the
 549                  * more normal Content-Length approach.
 550                  */
 551                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 552                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 553                 if (options.verbosity > 1) {
 554                         fprintf(stderr, "POST %s (%lu bytes)\n",
 555                                 rpc->service_name, (unsigned long)rpc->len);
 556                         fflush(stderr);
 557                 }
 558         }
 559
 560         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 561         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 562         curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 563
 564         err = run_slot(slot);
 565         if (err == HTTP_REAUTH && !large_request)
 566                 goto retry;
 567         if (err != HTTP_OK)
 568                 err = -1;
 569
 570         curl_slist_free_all(headers);
 571         free(gzip_body);
 572         return err;
 573 }
 574
 575 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 576 {
 577         const char *svc = rpc->service_name;
 578         struct strbuf buf = STRBUF_INIT;
 579         struct strbuf *preamble = rpc->stdin_preamble;
 580         struct child_process client;
 581         int err = 0;
 582
 583         memset(&client, 0, sizeof(client));
 584         client.in = -1;
 585         client.out = -1;
 586         client.git_cmd = 1;
 587         client.argv = rpc->argv;
 588         if (start_command(&client))
 589                 exit(1);
 590         if (preamble)
 591                 write_or_die(client.in, preamble->buf, preamble->len);
 592         if (heads)
 593                 write_or_die(client.in, heads->buf, heads->len);
 594
 595         rpc->alloc = http_post_buffer;
 596         rpc->buf = xmalloc(rpc->alloc);
 597         rpc->in = client.in;
 598         rpc->out = client.out;
 599         strbuf_init(&rpc->result, 0);
 600
 601         strbuf_addf(&buf, "%s%s", url, svc);
 602         rpc->service_url = strbuf_detach(&buf, NULL);
 603
 604         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 605         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 606
 607         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 608         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 609
 610         while (!err) {
 611                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 612                 if (!n)
 613                         break;
 614                 rpc->pos = 0;
 615                 rpc->len = n;
 616                 err |= post_rpc(rpc);
 617         }
 618
 619         close(client.in);
 620         client.in = -1;
 621         if (!err) {
 622                 strbuf_read(&rpc->result, client.out, 0);
 623         } else {
 624                 char buf[4096];
 625                 for (;;)
 626                         if (xread(client.out, buf, sizeof(buf)) <= 0)
 627                                 break;
 628         }
 629
 630         close(client.out);
 631         client.out = -1;
 632
 633         err |= finish_command(&client);
 634         free(rpc->service_url);
 635         free(rpc->hdr_content_type);
 636         free(rpc->hdr_accept);
 637         free(rpc->buf);
 638         strbuf_release(&buf);
 639         return err;
 640 }
 641
 642 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 643 {
 644         struct walker *walker;
 645         char **targets = xmalloc(nr_heads * sizeof(char*));
 646         int ret, i;
 647
 648         if (options.depth)
 649                 die("dumb http transport does not support --depth");
 650         for (i = 0; i < nr_heads; i++)
 651                 targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 652
 653         walker = get_http_walker(url);
 654         walker->get_all = 1;
 655         walker->get_tree = 1;
 656         walker->get_history = 1;
 657         walker->get_verbosely = options.verbosity >= 3;
 658         walker->get_recover = 0;
 659         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 660         walker_free(walker);
 661
 662         for (i = 0; i < nr_heads; i++)
 663                 free(targets[i]);
 664         free(targets);
 665
 666         return ret ? error("Fetch failed.") : 0;
 667 }
 668
 669 static int fetch_git(struct discovery *heads,
 670         int nr_heads, struct ref **to_fetch)
 671 {
 672         struct rpc_state rpc;
 673         struct strbuf preamble = STRBUF_INIT;
 674         char *depth_arg = NULL;
 675         int argc = 0, i, err;
 676         const char *argv[16];
 677
 678         argv[argc++] = "fetch-pack";
 679         argv[argc++] = "--stateless-rpc";
 680         argv[argc++] = "--stdin";
 681         argv[argc++] = "--lock-pack";
 682         if (options.followtags)
 683                 argv[argc++] = "--include-tag";
 684         if (options.thin)
 685                 argv[argc++] = "--thin";
 686         if (options.verbosity >= 3) {
 687                 argv[argc++] = "-v";
 688                 argv[argc++] = "-v";
 689         }
 690         if (options.check_self_contained_and_connected)
 691                 argv[argc++] = "--check-self-contained-and-connected";
 692         if (!options.progress)
 693                 argv[argc++] = "--no-progress";
 694         if (options.depth) {
 695                 struct strbuf buf = STRBUF_INIT;
 696                 strbuf_addf(&buf, "--depth=%lu", options.depth);
 697                 depth_arg = strbuf_detach(&buf, NULL);
 698                 argv[argc++] = depth_arg;
 699         }
 700         argv[argc++] = url;
 701         argv[argc++] = NULL;
 702
 703         for (i = 0; i < nr_heads; i++) {
 704                 struct ref *ref = to_fetch[i];
 705                 if (!ref->name || !*ref->name)
 706                         die("cannot fetch by sha1 over smart http");
 707                 packet_buf_write(&preamble, "%s\n", ref->name);
 708         }
 709         packet_buf_flush(&preamble);
 710
 711         memset(&rpc, 0, sizeof(rpc));
 712         rpc.service_name = "git-upload-pack",
 713         rpc.argv = argv;
 714         rpc.stdin_preamble = &preamble;
 715         rpc.gzip_request = 1;
 716
 717         err = rpc_service(&rpc, heads);
 718         if (rpc.result.len)
 719                 write_or_die(1, rpc.result.buf, rpc.result.len);
 720         strbuf_release(&rpc.result);
 721         strbuf_release(&preamble);
 722         free(depth_arg);
 723         return err;
 724 }
 725
 726 static int fetch(int nr_heads, struct ref **to_fetch)
 727 {
 728         struct discovery *d = discover_refs("git-upload-pack", 0);
 729         if (d->proto_git)
 730                 return fetch_git(d, nr_heads, to_fetch);
 731         else
 732                 return fetch_dumb(nr_heads, to_fetch);
 733 }
 734
 735 static void parse_fetch(struct strbuf *buf)
 736 {
 737         struct ref **to_fetch = NULL;
 738         struct ref *list_head = NULL;
 739         struct ref **list = &list_head;
 740         int alloc_heads = 0, nr_heads = 0;
 741
 742         do {
 743                 if (!prefixcmp(buf->buf, "fetch ")) {
 744                         char *p = buf->buf + strlen("fetch ");
 745                         char *name;
 746                         struct ref *ref;
 747                         unsigned char old_sha1[20];
 748
 749                         if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 750                                 die("protocol error: expected sha/ref, got %s'", p);
 751                         if (p[40] == ' ')
 752                                 name = p + 41;
 753                         else if (!p[40])
 754                                 name = "";
 755                         else
 756                                 die("protocol error: expected sha/ref, got %s'", p);
 757
 758                         ref = alloc_ref(name);
 759                         hashcpy(ref->old_sha1, old_sha1);
 760
 761                         *list = ref;
 762                         list = &ref->next;
 763
 764                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 765                         to_fetch[nr_heads++] = ref;
 766                 }
 767                 else
 768                         die("http transport does not support %s", buf->buf);
 769
 770                 strbuf_reset(buf);
 771                 if (strbuf_getline(buf, stdin, '\n') == EOF)
 772                         return;
 773                 if (!*buf->buf)
 774                         break;
 775         } while (1);
 776
 777         if (fetch(nr_heads, to_fetch))
 778                 exit(128); /* error already reported */
 779         free_refs(list_head);
 780         free(to_fetch);
 781
 782         printf("\n");
 783         fflush(stdout);
 784         strbuf_reset(buf);
 785 }
 786
 787 static int push_dav(int nr_spec, char **specs)
 788 {
 789         const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 790         int argc = 0, i;
 791
 792         argv[argc++] = "http-push";
 793         argv[argc++] = "--helper-status";
 794         if (options.dry_run)
 795                 argv[argc++] = "--dry-run";
 796         if (options.verbosity > 1)
 797                 argv[argc++] = "--verbose";
 798         argv[argc++] = url;
 799         for (i = 0; i < nr_spec; i++)
 800                 argv[argc++] = specs[i];
 801         argv[argc++] = NULL;
 802
 803         if (run_command_v_opt(argv, RUN_GIT_CMD))
 804                 die("git-%s failed", argv[0]);
 805         free(argv);
 806         return 0;
 807 }
 808
 809 static int push_git(struct discovery *heads, int nr_spec, char **specs)
 810 {
 811         struct rpc_state rpc;
 812         int i, err;
 813         struct argv_array args;
 814         struct string_list_item *cas_option;
 815
 816         argv_array_init(&args);
 817         argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 818                          NULL);
 819
 820         if (options.thin)
 821                 argv_array_push(&args, "--thin");
 822         if (options.dry_run)
 823                 argv_array_push(&args, "--dry-run");
 824         if (options.verbosity == 0)
 825                 argv_array_push(&args, "--quiet");
 826         else if (options.verbosity > 1)
 827                 argv_array_push(&args, "--verbose");
 828         argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 829         for_each_string_list_item(cas_option, &cas_options)
 830                 argv_array_push(&args, cas_option->string);
 831         argv_array_push(&args, url);
 832         for (i = 0; i < nr_spec; i++)
 833                 argv_array_push(&args, specs[i]);
 834
 835         memset(&rpc, 0, sizeof(rpc));
 836         rpc.service_name = "git-receive-pack",
 837         rpc.argv = args.argv;
 838
 839         err = rpc_service(&rpc, heads);
 840         if (rpc.result.len)
 841                 write_or_die(1, rpc.result.buf, rpc.result.len);
 842         strbuf_release(&rpc.result);
 843         argv_array_clear(&args);
 844         return err;
 845 }
 846
 847 static int push(int nr_spec, char **specs)
 848 {
 849         struct discovery *heads = discover_refs("git-receive-pack", 1);
 850         int ret;
 851
 852         if (heads->proto_git)
 853                 ret = push_git(heads, nr_spec, specs);
 854         else
 855                 ret = push_dav(nr_spec, specs);
 856         free_discovery(heads);
 857         return ret;
 858 }
 859
 860 static void parse_push(struct strbuf *buf)
 861 {
 862         char **specs = NULL;
 863         int alloc_spec = 0, nr_spec = 0, i, ret;
 864
 865         do {
 866                 if (!prefixcmp(buf->buf, "push ")) {
 867                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 868                         specs[nr_spec++] = xstrdup(buf->buf + 5);
 869                 }
 870                 else
 871                         die("http transport does not support %s", buf->buf);
 872
 873                 strbuf_reset(buf);
 874                 if (strbuf_getline(buf, stdin, '\n') == EOF)
 875                         goto free_specs;
 876                 if (!*buf->buf)
 877                         break;
 878         } while (1);
 879
 880         ret = push(nr_spec, specs);
 881         printf("\n");
 882         fflush(stdout);
 883
 884         if (ret)
 885                 exit(128); /* error already reported */
 886
 887  free_specs:
 888         for (i = 0; i < nr_spec; i++)
 889                 free(specs[i]);
 890         free(specs);
 891 }
 892
 893 int main(int argc, const char **argv)
 894 {
 895         struct strbuf buf = STRBUF_INIT;
 896         int nongit;
 897
 898         git_extract_argv0_path(argv[0]);
 899         setup_git_directory_gently(&nongit);
 900         if (argc < 2) {
 901                 fprintf(stderr, "Remote needed\n");
 902                 return 1;
 903         }
 904
 905         options.verbosity = 1;
 906         options.progress = !!isatty(2);
 907         options.thin = 1;
 908
 909         remote = remote_get(argv[1]);
 910
 911         if (argc > 2) {
 912                 end_url_with_slash(&buf, argv[2]);
 913         } else {
 914                 end_url_with_slash(&buf, remote->url[0]);
 915         }
 916
 917         url = strbuf_detach(&buf, NULL);
 918
 919         http_init(remote, url, 0);
 920
 921         do {
 922                 if (strbuf_getline(&buf, stdin, '\n') == EOF) {
 923                         if (ferror(stdin))
 924                                 fprintf(stderr, "Error reading command stream\n");
 925                         else
 926                                 fprintf(stderr, "Unexpected end of command stream\n");
 927                         return 1;
 928                 }
 929                 if (buf.len == 0)
 930                         break;
 931                 if (!prefixcmp(buf.buf, "fetch ")) {
 932                         if (nongit)
 933                                 die("Fetch attempted without a local repo");
 934                         parse_fetch(&buf);
 935
 936                 } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
 937                         int for_push = !!strstr(buf.buf + 4, "for-push");
 938                         output_refs(get_refs(for_push));
 939
 940                 } else if (!prefixcmp(buf.buf, "push ")) {
 941                         parse_push(&buf);
 942
 943                 } else if (!prefixcmp(buf.buf, "option ")) {
 944                         char *name = buf.buf + strlen("option ");
 945                         char *value = strchr(name, ' ');
 946                         int result;
 947
 948                         if (value)
 949                                 *value++ = '\0';
 950                         else
 951                                 value = "true";
 952
 953                         result = set_option(name, value);
 954                         if (!result)
 955                                 printf("ok\n");
 956                         else if (result < 0)
 957                                 printf("error invalid value\n");
 958                         else
 959                                 printf("unsupported\n");
 960                         fflush(stdout);
 961
 962                 } else if (!strcmp(buf.buf, "capabilities")) {
 963                         printf("fetch\n");
 964                         printf("option\n");
 965                         printf("push\n");
 966                         printf("check-connectivity\n");
 967                         printf("\n");
 968                         fflush(stdout);
 969                 } else {
 970                         fprintf(stderr, "Unknown command '%s'\n", buf.buf);
 971                         return 1;
 972                 }
 973                 strbuf_reset(&buf);
 974         } while (1);
 975
 976         http_cleanup();
 977
 978         return 0;
 979 }