remote-curl.c

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