git.oblomov.eu Git - git/blob - remote-curl.c

   1 #include "cache.h"
   2 #include "remote.h"
   3 #include "strbuf.h"
   4 #include "walker.h"
   5 #include "http.h"
   6 #include "exec_cmd.h"
   7 #include "run-command.h"
   8 #include "pkt-line.h"
   9 #include "sideband.h"
  10
  11 static struct remote *remote;
  12 static const char *url; /* always ends with a trailing slash */
  13
  14 struct options {
  15         int verbosity;
  16         unsigned long depth;
  17         unsigned progress : 1,
  18                 check_self_contained_and_connected : 1,
  19                 followtags : 1,
  20                 dry_run : 1,
  21                 thin : 1;
  22 };
  23 static struct options options;
  24
  25 static int set_option(const char *name, const char *value)
  26 {
  27         if (!strcmp(name, "verbosity")) {
  28                 char *end;
  29                 int v = strtol(value, &end, 10);
  30                 if (value == end || *end)
  31                         return -1;
  32                 options.verbosity = v;
  33                 return 0;
  34         }
  35         else if (!strcmp(name, "progress")) {
  36                 if (!strcmp(value, "true"))
  37                         options.progress = 1;
  38                 else if (!strcmp(value, "false"))
  39                         options.progress = 0;
  40                 else
  41                         return -1;
  42                 return 0;
  43         }
  44         else if (!strcmp(name, "depth")) {
  45                 char *end;
  46                 unsigned long v = strtoul(value, &end, 10);
  47                 if (value == end || *end)
  48                         return -1;
  49                 options.depth = v;
  50                 return 0;
  51         }
  52         else if (!strcmp(name, "followtags")) {
  53                 if (!strcmp(value, "true"))
  54                         options.followtags = 1;
  55                 else if (!strcmp(value, "false"))
  56                         options.followtags = 0;
  57                 else
  58                         return -1;
  59                 return 0;
  60         }
  61         else if (!strcmp(name, "dry-run")) {
  62                 if (!strcmp(value, "true"))
  63                         options.dry_run = 1;
  64                 else if (!strcmp(value, "false"))
  65                         options.dry_run = 0;
  66                 else
  67                         return -1;
  68                 return 0;
  69         }
  70         else if (!strcmp(name, "check-connectivity")) {
  71                 if (!strcmp(value, "true"))
  72                         options.check_self_contained_and_connected = 1;
  73                 else if (!strcmp(value, "false"))
  74                         options.check_self_contained_and_connected = 0;
  75                 else
  76                         return -1;
  77                 return 0;
  78         }
  79         else {
  80                 return 1 /* unsupported */;
  81         }
  82 }
  83
  84 struct discovery {
  85         const char *service;
  86         char *buf_alloc;
  87         char *buf;
  88         size_t len;
  89         struct ref *refs;
  90         unsigned proto_git : 1;
  91 };
  92 static struct discovery *last_discovery;
  93
  94 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
  95 {
  96         struct ref *list = NULL;
  97         get_remote_heads(-1, heads->buf, heads->len, &list,
  98                          for_push ? REF_NORMAL : 0, NULL);
  99         return list;
 100 }
 101
 102 static struct ref *parse_info_refs(struct discovery *heads)
 103 {
 104         char *data, *start, *mid;
 105         char *ref_name;
 106         int i = 0;
 107
 108         struct ref *refs = NULL;
 109         struct ref *ref = NULL;
 110         struct ref *last_ref = NULL;
 111
 112         data = heads->buf;
 113         start = NULL;
 114         mid = data;
 115         while (i < heads->len) {
 116                 if (!start) {
 117                         start = &data[i];
 118                 }
 119                 if (data[i] == '\t')
 120                         mid = &data[i];
 121                 if (data[i] == '\n') {
 122                         if (mid - start != 40)
 123                                 die("%sinfo/refs not valid: is this a git repository?", url);
 124                         data[i] = 0;
 125                         ref_name = mid + 1;
 126                         ref = xmalloc(sizeof(struct ref) +
 127                                       strlen(ref_name) + 1);
 128                         memset(ref, 0, sizeof(struct ref));
 129                         strcpy(ref->name, ref_name);
 130                         get_sha1_hex(start, ref->old_sha1);
 131                         if (!refs)
 132                                 refs = ref;
 133                         if (last_ref)
 134                                 last_ref->next = ref;
 135                         last_ref = ref;
 136                         start = NULL;
 137                 }
 138                 i++;
 139         }
 140
 141         ref = alloc_ref("HEAD");
 142         if (!http_fetch_ref(url, ref) &&
 143             !resolve_remote_symref(ref, refs)) {
 144                 ref->next = refs;
 145                 refs = ref;
 146         } else {
 147                 free(ref);
 148         }
 149
 150         return refs;
 151 }
 152
 153 static void free_discovery(struct discovery *d)
 154 {
 155         if (d) {
 156                 if (d == last_discovery)
 157                         last_discovery = NULL;
 158                 free(d->buf_alloc);
 159                 free_refs(d->refs);
 160                 free(d);
 161         }
 162 }
 163
 164 static int show_http_message(struct strbuf *type, struct strbuf *msg)
 165 {
 166         const char *p, *eol;
 167
 168         /*
 169          * We only show text/plain parts, as other types are likely
 170          * to be ugly to look at on the user's terminal.
 171          *
 172          * TODO should handle "; charset=XXX", and re-encode into
 173          * logoutputencoding
 174          */
 175         if (strcasecmp(type->buf, "text/plain"))
 176                 return -1;
 177
 178         strbuf_trim(msg);
 179         if (!msg->len)
 180                 return -1;
 181
 182         p = msg->buf;
 183         do {
 184                 eol = strchrnul(p, '\n');
 185                 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 186                 p = eol + 1;
 187         } while(*eol);
 188         return 0;
 189 }
 190
 191 static struct discovery* discover_refs(const char *service, int for_push)
 192 {
 193         struct strbuf exp = STRBUF_INIT;
 194         struct strbuf type = STRBUF_INIT;
 195         struct strbuf buffer = STRBUF_INIT;
 196         struct discovery *last = last_discovery;
 197         char *refs_url;
 198         int http_ret, maybe_smart = 0;
 199
 200         if (last && !strcmp(service, last->service))
 201                 return last;
 202         free_discovery(last);
 203
 204         strbuf_addf(&buffer, "%sinfo/refs", url);
 205         if ((!prefixcmp(url, "http://") || !prefixcmp(url, "https://")) &&
 206              git_env_bool("GIT_SMART_HTTP", 1)) {
 207                 maybe_smart = 1;
 208                 if (!strchr(url, '?'))
 209                         strbuf_addch(&buffer, '?');
 210                 else
 211                         strbuf_addch(&buffer, '&');
 212                 strbuf_addf(&buffer, "service=%s", service);
 213         }
 214         refs_url = strbuf_detach(&buffer, NULL);
 215
 216         http_ret = http_get_strbuf(refs_url, &type, &buffer,
 217                                    HTTP_NO_CACHE | HTTP_KEEP_ERROR);
 218         switch (http_ret) {
 219         case HTTP_OK:
 220                 break;
 221         case HTTP_MISSING_TARGET:
 222                 show_http_message(&type, &buffer);
 223                 die("repository '%s' not found", url);
 224         case HTTP_NOAUTH:
 225                 show_http_message(&type, &buffer);
 226                 die("Authentication failed for '%s'", url);
 227         default:
 228                 show_http_message(&type, &buffer);
 229                 die("unable to access '%s': %s", url, curl_errorstr);
 230         }
 231
 232         last= xcalloc(1, sizeof(*last_discovery));
 233         last->service = service;
 234         last->buf_alloc = strbuf_detach(&buffer, &last->len);
 235         last->buf = last->buf_alloc;
 236
 237         strbuf_addf(&exp, "application/x-%s-advertisement", service);
 238         if (maybe_smart &&
 239             (5 <= last->len && last->buf[4] == '#') &&
 240             !strbuf_cmp(&exp, &type)) {
 241                 char *line;
 242
 243                 /*
 244                  * smart HTTP response; validate that the service
 245                  * pkt-line matches our request.
 246                  */
 247                 line = packet_read_line_buf(&last->buf, &last->len, NULL);
 248
 249                 strbuf_reset(&exp);
 250                 strbuf_addf(&exp, "# service=%s", service);
 251                 if (strcmp(line, exp.buf))
 252                         die("invalid server response; got '%s'", line);
 253                 strbuf_release(&exp);
 254
 255                 /* The header can include additional metadata lines, up
 256                  * until a packet flush marker.  Ignore these now, but
 257                  * in the future we might start to scan them.
 258                  */
 259                 while (packet_read_line_buf(&last->buf, &last->len, NULL))
 260                         ;
 261
 262                 last->proto_git = 1;
 263         }
 264
 265         if (last->proto_git)
 266                 last->refs = parse_git_refs(last, for_push);
 267         else
 268                 last->refs = parse_info_refs(last);
 269
 270         free(refs_url);
 271         strbuf_release(&exp);
 272         strbuf_release(&type);
 273         strbuf_release(&buffer);
 274         last_discovery = last;
 275         return last;
 276 }
 277
 278 static struct ref *get_refs(int for_push)
 279 {
 280         struct discovery *heads;
 281
 282         if (for_push)
 283                 heads = discover_refs("git-receive-pack", for_push);
 284         else
 285                 heads = discover_refs("git-upload-pack", for_push);
 286
 287         return heads->refs;
 288 }
 289
 290 static void output_refs(struct ref *refs)
 291 {
 292         struct ref *posn;
 293         for (posn = refs; posn; posn = posn->next) {
 294                 if (posn->symref)
 295                         printf("@%s %s\n", posn->symref, posn->name);
 296                 else
 297                         printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 298         }
 299         printf("\n");
 300         fflush(stdout);
 301 }
 302
 303 struct rpc_state {
 304         const char *service_name;
 305         const char **argv;
 306         struct strbuf *stdin_preamble;
 307         char *service_url;
 308         char *hdr_content_type;
 309         char *hdr_accept;
 310         char *buf;
 311         size_t alloc;
 312         size_t len;
 313         size_t pos;
 314         int in;
 315         int out;
 316         struct strbuf result;
 317         unsigned gzip_request : 1;
 318         unsigned initial_buffer : 1;
 319 };
 320
 321 static size_t rpc_out(void *ptr, size_t eltsize,
 322                 size_t nmemb, void *buffer_)
 323 {
 324         size_t max = eltsize * nmemb;
 325         struct rpc_state *rpc = buffer_;
 326         size_t avail = rpc->len - rpc->pos;
 327
 328         if (!avail) {
 329                 rpc->initial_buffer = 0;
 330                 avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 331                 if (!avail)
 332                         return 0;
 333                 rpc->pos = 0;
 334                 rpc->len = avail;
 335         }
 336
 337         if (max < avail)
 338                 avail = max;
 339         memcpy(ptr, rpc->buf + rpc->pos, avail);
 340         rpc->pos += avail;
 341         return avail;
 342 }
 343
 344 #ifndef NO_CURL_IOCTL
 345 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 346 {
 347         struct rpc_state *rpc = clientp;
 348
 349         switch (cmd) {
 350         case CURLIOCMD_NOP:
 351                 return CURLIOE_OK;
 352
 353         case CURLIOCMD_RESTARTREAD:
 354                 if (rpc->initial_buffer) {
 355                         rpc->pos = 0;
 356                         return CURLIOE_OK;
 357                 }
 358                 fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
 359                 return CURLIOE_FAILRESTART;
 360
 361         default:
 362                 return CURLIOE_UNKNOWNCMD;
 363         }
 364 }
 365 #endif
 366
 367 static size_t rpc_in(char *ptr, size_t eltsize,
 368                 size_t nmemb, void *buffer_)
 369 {
 370         size_t size = eltsize * nmemb;
 371         struct rpc_state *rpc = buffer_;
 372         write_or_die(rpc->in, ptr, size);
 373         return size;
 374 }
 375
 376 static int run_slot(struct active_request_slot *slot)
 377 {
 378         int err;
 379         struct slot_results results;
 380
 381         slot->results = &results;
 382         slot->curl_result = curl_easy_perform(slot->curl);
 383         finish_active_slot(slot);
 384
 385         err = handle_curl_result(&results);
 386         if (err != HTTP_OK && err != HTTP_REAUTH) {
 387                 error("RPC failed; result=%d, HTTP code = %ld",
 388                       results.curl_result, results.http_code);
 389         }
 390
 391         return err;
 392 }
 393
 394 static int probe_rpc(struct rpc_state *rpc)
 395 {
 396         struct active_request_slot *slot;
 397         struct curl_slist *headers = NULL;
 398         struct strbuf buf = STRBUF_INIT;
 399         int err;
 400
 401         slot = get_active_slot();
 402
 403         headers = curl_slist_append(headers, rpc->hdr_content_type);
 404         headers = curl_slist_append(headers, rpc->hdr_accept);
 405
 406         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 407         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 408         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 409         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 410         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 411         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 412         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 413         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 414         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 415
 416         err = run_slot(slot);
 417
 418         curl_slist_free_all(headers);
 419         strbuf_release(&buf);
 420         return err;
 421 }
 422
 423 static int post_rpc(struct rpc_state *rpc)
 424 {
 425         struct active_request_slot *slot;
 426         struct curl_slist *headers = NULL;
 427         int use_gzip = rpc->gzip_request;
 428         char *gzip_body = NULL;
 429         size_t gzip_size = 0;
 430         int err, large_request = 0;
 431
 432         /* Try to load the entire request, if we can fit it into the
 433          * allocated buffer space we can use HTTP/1.0 and avoid the
 434          * chunked encoding mess.
 435          */
 436         while (1) {
 437                 size_t left = rpc->alloc - rpc->len;
 438                 char *buf = rpc->buf + rpc->len;
 439                 int n;
 440
 441                 if (left < LARGE_PACKET_MAX) {
 442                         large_request = 1;
 443                         use_gzip = 0;
 444                         break;
 445                 }
 446
 447                 n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 448                 if (!n)
 449                         break;
 450                 rpc->len += n;
 451         }
 452
 453         if (large_request) {
 454                 do {
 455                         err = probe_rpc(rpc);
 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                 goto retry;
 557         if (err != HTTP_OK)
 558                 err = -1;
 559
 560         curl_slist_free_all(headers);
 561         free(gzip_body);
 562         return err;
 563 }
 564
 565 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 566 {
 567         const char *svc = rpc->service_name;
 568         struct strbuf buf = STRBUF_INIT;
 569         struct strbuf *preamble = rpc->stdin_preamble;
 570         struct child_process client;
 571         int err = 0;
 572
 573         memset(&client, 0, sizeof(client));
 574         client.in = -1;
 575         client.out = -1;
 576         client.git_cmd = 1;
 577         client.argv = rpc->argv;
 578         if (start_command(&client))
 579                 exit(1);
 580         if (preamble)
 581                 write_or_die(client.in, preamble->buf, preamble->len);
 582         if (heads)
 583                 write_or_die(client.in, heads->buf, heads->len);
 584
 585         rpc->alloc = http_post_buffer;
 586         rpc->buf = xmalloc(rpc->alloc);
 587         rpc->in = client.in;
 588         rpc->out = client.out;
 589         strbuf_init(&rpc->result, 0);
 590
 591         strbuf_addf(&buf, "%s%s", url, svc);
 592         rpc->service_url = strbuf_detach(&buf, NULL);
 593
 594         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 595         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 596
 597         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 598         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 599
 600         while (!err) {
 601                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 602                 if (!n)
 603                         break;
 604                 rpc->pos = 0;
 605                 rpc->len = n;
 606                 err |= post_rpc(rpc);
 607         }
 608
 609         close(client.in);
 610         client.in = -1;
 611         if (!err) {
 612                 strbuf_read(&rpc->result, client.out, 0);
 613         } else {
 614                 char buf[4096];
 615                 for (;;)
 616                         if (xread(client.out, buf, sizeof(buf)) <= 0)
 617                                 break;
 618         }
 619
 620         close(client.out);
 621         client.out = -1;
 622
 623         err |= finish_command(&client);
 624         free(rpc->service_url);
 625         free(rpc->hdr_content_type);
 626         free(rpc->hdr_accept);
 627         free(rpc->buf);
 628         strbuf_release(&buf);
 629         return err;
 630 }
 631
 632 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 633 {
 634         struct walker *walker;
 635         char **targets = xmalloc(nr_heads * sizeof(char*));
 636         int ret, i;
 637
 638         if (options.depth)
 639                 die("dumb http transport does not support --depth");
 640         for (i = 0; i < nr_heads; i++)
 641                 targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 642
 643         walker = get_http_walker(url);
 644         walker->get_all = 1;
 645         walker->get_tree = 1;
 646         walker->get_history = 1;
 647         walker->get_verbosely = options.verbosity >= 3;
 648         walker->get_recover = 0;
 649         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 650         walker_free(walker);
 651
 652         for (i = 0; i < nr_heads; i++)
 653                 free(targets[i]);
 654         free(targets);
 655
 656         return ret ? error("Fetch failed.") : 0;
 657 }
 658
 659 static int fetch_git(struct discovery *heads,
 660         int nr_heads, struct ref **to_fetch)
 661 {
 662         struct rpc_state rpc;
 663         struct strbuf preamble = STRBUF_INIT;
 664         char *depth_arg = NULL;
 665         int argc = 0, i, err;
 666         const char *argv[16];
 667
 668         argv[argc++] = "fetch-pack";
 669         argv[argc++] = "--stateless-rpc";
 670         argv[argc++] = "--stdin";
 671         argv[argc++] = "--lock-pack";
 672         if (options.followtags)
 673                 argv[argc++] = "--include-tag";
 674         if (options.thin)
 675                 argv[argc++] = "--thin";
 676         if (options.verbosity >= 3) {
 677                 argv[argc++] = "-v";
 678                 argv[argc++] = "-v";
 679         }
 680         if (options.check_self_contained_and_connected)
 681                 argv[argc++] = "--check-self-contained-and-connected";
 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;
 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;
 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         const char **argv;
 803         int argc = 0, i, err;
 804
 805         argv = xmalloc((10 + nr_spec) * sizeof(char*));
 806         argv[argc++] = "send-pack";
 807         argv[argc++] = "--stateless-rpc";
 808         argv[argc++] = "--helper-status";
 809         if (options.thin)
 810                 argv[argc++] = "--thin";
 811         if (options.dry_run)
 812                 argv[argc++] = "--dry-run";
 813         if (options.verbosity == 0)
 814                 argv[argc++] = "--quiet";
 815         else if (options.verbosity > 1)
 816                 argv[argc++] = "--verbose";
 817         argv[argc++] = options.progress ? "--progress" : "--no-progress";
 818         argv[argc++] = url;
 819         for (i = 0; i < nr_spec; i++)
 820                 argv[argc++] = specs[i];
 821         argv[argc++] = NULL;
 822
 823         memset(&rpc, 0, sizeof(rpc));
 824         rpc.service_name = "git-receive-pack",
 825         rpc.argv = 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         free(argv);
 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 }