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