remote-curl.c

   1 #include "cache.h"
   2 #include "remote.h"
   3 #include "strbuf.h"
   4 #include "walker.h"
   5 #include "http.h"
   6 #include "exec_cmd.h"
   7 #include "run-command.h"
   8 #include "pkt-line.h"
   9 #include "sideband.h"
  10 #include "argv-array.h"
  11
  12 static struct remote *remote;
  13 static const char *url; /* always ends with a trailing slash */
  14
  15 struct options {
  16         int verbosity;
  17         unsigned long depth;
  18         unsigned progress : 1,
  19                 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 {
  71                 return 1 /* unsupported */;
  72         }
  73 }
  74
  75 struct discovery {
  76         const char *service;
  77         char *buf_alloc;
  78         char *buf;
  79         size_t len;
  80         struct ref *refs;
  81         unsigned proto_git : 1;
  82 };
  83 static struct discovery *last_discovery;
  84
  85 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
  86 {
  87         struct ref *list = NULL;
  88         get_remote_heads(-1, heads->buf, heads->len, &list,
  89                          for_push ? REF_NORMAL : 0, NULL);
  90         return list;
  91 }
  92
  93 static struct ref *parse_info_refs(struct discovery *heads)
  94 {
  95         char *data, *start, *mid;
  96         char *ref_name;
  97         int i = 0;
  98
  99         struct ref *refs = NULL;
 100         struct ref *ref = NULL;
 101         struct ref *last_ref = NULL;
 102
 103         data = heads->buf;
 104         start = NULL;
 105         mid = data;
 106         while (i < heads->len) {
 107                 if (!start) {
 108                         start = &data[i];
 109                 }
 110                 if (data[i] == '\t')
 111                         mid = &data[i];
 112                 if (data[i] == '\n') {
 113                         if (mid - start != 40)
 114                                 die("%sinfo/refs not valid: is this a git repository?", url);
 115                         data[i] = 0;
 116                         ref_name = mid + 1;
 117                         ref = xmalloc(sizeof(struct ref) +
 118                                       strlen(ref_name) + 1);
 119                         memset(ref, 0, sizeof(struct ref));
 120                         strcpy(ref->name, ref_name);
 121                         get_sha1_hex(start, ref->old_sha1);
 122                         if (!refs)
 123                                 refs = ref;
 124                         if (last_ref)
 125                                 last_ref->next = ref;
 126                         last_ref = ref;
 127                         start = NULL;
 128                 }
 129                 i++;
 130         }
 131
 132         ref = alloc_ref("HEAD");
 133         if (!http_fetch_ref(url, ref) &&
 134             !resolve_remote_symref(ref, refs)) {
 135                 ref->next = refs;
 136                 refs = ref;
 137         } else {
 138                 free(ref);
 139         }
 140
 141         return refs;
 142 }
 143
 144 static void free_discovery(struct discovery *d)
 145 {
 146         if (d) {
 147                 if (d == last_discovery)
 148                         last_discovery = NULL;
 149                 free(d->buf_alloc);
 150                 free_refs(d->refs);
 151                 free(d);
 152         }
 153 }
 154
 155 static int show_http_message(struct strbuf *type, struct strbuf *msg)
 156 {
 157         const char *p, *eol;
 158
 159         /*
 160          * We only show text/plain parts, as other types are likely
 161          * to be ugly to look at on the user's terminal.
 162          *
 163          * TODO should handle "; charset=XXX", and re-encode into
 164          * logoutputencoding
 165          */
 166         if (strcasecmp(type->buf, "text/plain"))
 167                 return -1;
 168
 169         strbuf_trim(msg);
 170         if (!msg->len)
 171                 return -1;
 172
 173         p = msg->buf;
 174         do {
 175                 eol = strchrnul(p, '\n');
 176                 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 177                 p = eol + 1;
 178         } while(*eol);
 179         return 0;
 180 }
 181
 182 static struct discovery* discover_refs(const char *service, int for_push)
 183 {
 184         struct strbuf exp = STRBUF_INIT;
 185         struct strbuf type = STRBUF_INIT;
 186         struct strbuf buffer = STRBUF_INIT;
 187         struct discovery *last = last_discovery;
 188         char *refs_url;
 189         int http_ret, maybe_smart = 0;
 190
 191         if (last && !strcmp(service, last->service))
 192                 return last;
 193         free_discovery(last);
 194
 195         strbuf_addf(&buffer, "%sinfo/refs", url);
 196         if ((!prefixcmp(url, "http://") || !prefixcmp(url, "https://")) &&
 197              git_env_bool("GIT_SMART_HTTP", 1)) {
 198                 maybe_smart = 1;
 199                 if (!strchr(url, '?'))
 200                         strbuf_addch(&buffer, '?');
 201                 else
 202                         strbuf_addch(&buffer, '&');
 203                 strbuf_addf(&buffer, "service=%s", service);
 204         }
 205         refs_url = strbuf_detach(&buffer, NULL);
 206
 207         http_ret = http_get_strbuf(refs_url, &type, &buffer,
 208                                    HTTP_NO_CACHE | HTTP_KEEP_ERROR);
 209         switch (http_ret) {
 210         case HTTP_OK:
 211                 break;
 212         case HTTP_MISSING_TARGET:
 213                 show_http_message(&type, &buffer);
 214                 die("repository '%s' not found", url);
 215         case HTTP_NOAUTH:
 216                 show_http_message(&type, &buffer);
 217                 die("Authentication failed for '%s'", url);
 218         default:
 219                 show_http_message(&type, &buffer);
 220                 die("unable to access '%s': %s", url, curl_errorstr);
 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                     struct slot_results *results)
 369 {
 370         int err;
 371         struct slot_results results_buf;
 372
 373         if (!results)
 374                 results = &results_buf;
 375
 376         slot->results = results;
 377         slot->curl_result = curl_easy_perform(slot->curl);
 378         finish_active_slot(slot);
 379
 380         err = handle_curl_result(results);
 381         if (err != HTTP_OK && err != HTTP_REAUTH) {
 382                 error("RPC failed; result=%d, HTTP code = %ld",
 383                       results->curl_result, results->http_code);
 384         }
 385
 386         return err;
 387 }
 388
 389 static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 390 {
 391         struct active_request_slot *slot;
 392         struct curl_slist *headers = NULL;
 393         struct strbuf buf = STRBUF_INIT;
 394         int err;
 395
 396         slot = get_active_slot();
 397
 398         headers = curl_slist_append(headers, rpc->hdr_content_type);
 399         headers = curl_slist_append(headers, rpc->hdr_accept);
 400
 401         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 402         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 403         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 404         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 405         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 406         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 407         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 408         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 409         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 410
 411         err = run_slot(slot, results);
 412
 413         curl_slist_free_all(headers);
 414         strbuf_release(&buf);
 415         return err;
 416 }
 417
 418 static int post_rpc(struct rpc_state *rpc)
 419 {
 420         struct active_request_slot *slot;
 421         struct curl_slist *headers = NULL;
 422         int use_gzip = rpc->gzip_request;
 423         char *gzip_body = NULL;
 424         size_t gzip_size = 0;
 425         int err, large_request = 0;
 426         int needs_100_continue = 0;
 427
 428         /* Try to load the entire request, if we can fit it into the
 429          * allocated buffer space we can use HTTP/1.0 and avoid the
 430          * chunked encoding mess.
 431          */
 432         while (1) {
 433                 size_t left = rpc->alloc - rpc->len;
 434                 char *buf = rpc->buf + rpc->len;
 435                 int n;
 436
 437                 if (left < LARGE_PACKET_MAX) {
 438                         large_request = 1;
 439                         use_gzip = 0;
 440                         break;
 441                 }
 442
 443                 n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 444                 if (!n)
 445                         break;
 446                 rpc->len += n;
 447         }
 448
 449         if (large_request) {
 450                 struct slot_results results;
 451
 452                 do {
 453                         err = probe_rpc(rpc, &results);
 454                 } while (err == HTTP_REAUTH);
 455                 if (err != HTTP_OK)
 456                         return -1;
 457
 458                 if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 459                         needs_100_continue = 1;
 460         }
 461
 462         headers = curl_slist_append(headers, rpc->hdr_content_type);
 463         headers = curl_slist_append(headers, rpc->hdr_accept);
 464         headers = curl_slist_append(headers, needs_100_continue ?
 465                 "Expect: 100-continue" : "Expect:");
 466
 467 retry:
 468         slot = get_active_slot();
 469
 470         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 471         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 472         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 473         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 474
 475         if (large_request) {
 476                 /* The request body is large and the size cannot be predicted.
 477                  * We must use chunked encoding to send it.
 478                  */
 479                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 480                 rpc->initial_buffer = 1;
 481                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 482                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 483 #ifndef NO_CURL_IOCTL
 484                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 485                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 486 #endif
 487                 if (options.verbosity > 1) {
 488                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 489                         fflush(stderr);
 490                 }
 491
 492         } else if (gzip_body) {
 493                 /*
 494                  * If we are looping to retry authentication, then the previous
 495                  * run will have set up the headers and gzip buffer already,
 496                  * and we just need to send it.
 497                  */
 498                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 499                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 500
 501         } else if (use_gzip && 1024 < rpc->len) {
 502                 /* The client backend isn't giving us compressed data so
 503                  * we can try to deflate it ourselves, this may save on.
 504                  * the transfer time.
 505                  */
 506                 git_zstream stream;
 507                 int ret;
 508
 509                 memset(&stream, 0, sizeof(stream));
 510                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 511                 gzip_size = git_deflate_bound(&stream, rpc->len);
 512                 gzip_body = xmalloc(gzip_size);
 513
 514                 stream.next_in = (unsigned char *)rpc->buf;
 515                 stream.avail_in = rpc->len;
 516                 stream.next_out = (unsigned char *)gzip_body;
 517                 stream.avail_out = gzip_size;
 518
 519                 ret = git_deflate(&stream, Z_FINISH);
 520                 if (ret != Z_STREAM_END)
 521                         die("cannot deflate request; zlib deflate error %d", ret);
 522
 523                 ret = git_deflate_end_gently(&stream);
 524                 if (ret != Z_OK)
 525                         die("cannot deflate request; zlib end error %d", ret);
 526
 527                 gzip_size = stream.total_out;
 528
 529                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 530                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 531                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 532
 533                 if (options.verbosity > 1) {
 534                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 535                                 rpc->service_name,
 536                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
 537                         fflush(stderr);
 538                 }
 539         } else {
 540                 /* We know the complete request size in advance, use the
 541                  * more normal Content-Length approach.
 542                  */
 543                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 544                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 545                 if (options.verbosity > 1) {
 546                         fprintf(stderr, "POST %s (%lu bytes)\n",
 547                                 rpc->service_name, (unsigned long)rpc->len);
 548                         fflush(stderr);
 549                 }
 550         }
 551
 552         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 553         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 554         curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 555
 556         err = run_slot(slot, NULL);
 557         if (err == HTTP_REAUTH && !large_request)
 558                 goto retry;
 559         if (err != HTTP_OK)
 560                 err = -1;
 561
 562         curl_slist_free_all(headers);
 563         free(gzip_body);
 564         return err;
 565 }
 566
 567 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 568 {
 569         const char *svc = rpc->service_name;
 570         struct strbuf buf = STRBUF_INIT;
 571         struct strbuf *preamble = rpc->stdin_preamble;
 572         struct child_process client;
 573         int err = 0;
 574
 575         memset(&client, 0, sizeof(client));
 576         client.in = -1;
 577         client.out = -1;
 578         client.git_cmd = 1;
 579         client.argv = rpc->argv;
 580         if (start_command(&client))
 581                 exit(1);
 582         if (preamble)
 583                 write_or_die(client.in, preamble->buf, preamble->len);
 584         if (heads)
 585                 write_or_die(client.in, heads->buf, heads->len);
 586
 587         rpc->alloc = http_post_buffer;
 588         rpc->buf = xmalloc(rpc->alloc);
 589         rpc->in = client.in;
 590         rpc->out = client.out;
 591         strbuf_init(&rpc->result, 0);
 592
 593         strbuf_addf(&buf, "%s%s", url, svc);
 594         rpc->service_url = strbuf_detach(&buf, NULL);
 595
 596         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 597         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 598
 599         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 600         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 601
 602         while (!err) {
 603                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 604                 if (!n)
 605                         break;
 606                 rpc->pos = 0;
 607                 rpc->len = n;
 608                 err |= post_rpc(rpc);
 609         }
 610
 611         close(client.in);
 612         client.in = -1;
 613         if (!err) {
 614                 strbuf_read(&rpc->result, client.out, 0);
 615         } else {
 616                 char buf[4096];
 617                 for (;;)
 618                         if (xread(client.out, buf, sizeof(buf)) <= 0)
 619                                 break;
 620         }
 621
 622         close(client.out);
 623         client.out = -1;
 624
 625         err |= finish_command(&client);
 626         free(rpc->service_url);
 627         free(rpc->hdr_content_type);
 628         free(rpc->hdr_accept);
 629         free(rpc->buf);
 630         strbuf_release(&buf);
 631         return err;
 632 }
 633
 634 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 635 {
 636         struct walker *walker;
 637         char **targets = xmalloc(nr_heads * sizeof(char*));
 638         int ret, i;
 639
 640         if (options.depth)
 641                 die("dumb http transport does not support --depth");
 642         for (i = 0; i < nr_heads; i++)
 643                 targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 644
 645         walker = get_http_walker(url);
 646         walker->get_all = 1;
 647         walker->get_tree = 1;
 648         walker->get_history = 1;
 649         walker->get_verbosely = options.verbosity >= 3;
 650         walker->get_recover = 0;
 651         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 652         walker_free(walker);
 653
 654         for (i = 0; i < nr_heads; i++)
 655                 free(targets[i]);
 656         free(targets);
 657
 658         return ret ? error("Fetch failed.") : 0;
 659 }
 660
 661 static int fetch_git(struct discovery *heads,
 662         int nr_heads, struct ref **to_fetch)
 663 {
 664         struct rpc_state rpc;
 665         struct strbuf preamble = STRBUF_INIT;
 666         char *depth_arg = NULL;
 667         int argc = 0, i, err;
 668         const char *argv[15];
 669
 670         argv[argc++] = "fetch-pack";
 671         argv[argc++] = "--stateless-rpc";
 672         argv[argc++] = "--stdin";
 673         argv[argc++] = "--lock-pack";
 674         if (options.followtags)
 675                 argv[argc++] = "--include-tag";
 676         if (options.thin)
 677                 argv[argc++] = "--thin";
 678         if (options.verbosity >= 3) {
 679                 argv[argc++] = "-v";
 680                 argv[argc++] = "-v";
 681         }
 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         int i, err;
 803         struct argv_array args;
 804
 805         argv_array_init(&args);
 806         argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 807                          NULL);
 808
 809         if (options.thin)
 810                 argv_array_push(&args, "--thin");
 811         if (options.dry_run)
 812                 argv_array_push(&args, "--dry-run");
 813         if (options.verbosity == 0)
 814                 argv_array_push(&args, "--quiet");
 815         else if (options.verbosity > 1)
 816                 argv_array_push(&args, "--verbose");
 817         argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 818         argv_array_push(&args, url);
 819         for (i = 0; i < nr_spec; i++)
 820                 argv_array_push(&args, specs[i]);
 821
 822         memset(&rpc, 0, sizeof(rpc));
 823         rpc.service_name = "git-receive-pack",
 824         rpc.argv = args.argv;
 825
 826         err = rpc_service(&rpc, heads);
 827         if (rpc.result.len)
 828                 write_or_die(1, rpc.result.buf, rpc.result.len);
 829         strbuf_release(&rpc.result);
 830         argv_array_clear(&args);
 831         return err;
 832 }
 833
 834 static int push(int nr_spec, char **specs)
 835 {
 836         struct discovery *heads = discover_refs("git-receive-pack", 1);
 837         int ret;
 838
 839         if (heads->proto_git)
 840                 ret = push_git(heads, nr_spec, specs);
 841         else
 842                 ret = push_dav(nr_spec, specs);
 843         free_discovery(heads);
 844         return ret;
 845 }
 846
 847 static void parse_push(struct strbuf *buf)
 848 {
 849         char **specs = NULL;
 850         int alloc_spec = 0, nr_spec = 0, i, ret;
 851
 852         do {
 853                 if (!prefixcmp(buf->buf, "push ")) {
 854                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 855                         specs[nr_spec++] = xstrdup(buf->buf + 5);
 856                 }
 857                 else
 858                         die("http transport does not support %s", buf->buf);
 859
 860                 strbuf_reset(buf);
 861                 if (strbuf_getline(buf, stdin, '\n') == EOF)
 862                         goto free_specs;
 863                 if (!*buf->buf)
 864                         break;
 865         } while (1);
 866
 867         ret = push(nr_spec, specs);
 868         printf("\n");
 869         fflush(stdout);
 870
 871         if (ret)
 872                 exit(128); /* error already reported */
 873
 874  free_specs:
 875         for (i = 0; i < nr_spec; i++)
 876                 free(specs[i]);
 877         free(specs);
 878 }
 879
 880 int main(int argc, const char **argv)
 881 {
 882         struct strbuf buf = STRBUF_INIT;
 883         int nongit;
 884
 885         git_extract_argv0_path(argv[0]);
 886         setup_git_directory_gently(&nongit);
 887         if (argc < 2) {
 888                 fprintf(stderr, "Remote needed\n");
 889                 return 1;
 890         }
 891
 892         options.verbosity = 1;
 893         options.progress = !!isatty(2);
 894         options.thin = 1;
 895
 896         remote = remote_get(argv[1]);
 897
 898         if (argc > 2) {
 899                 end_url_with_slash(&buf, argv[2]);
 900         } else {
 901                 end_url_with_slash(&buf, remote->url[0]);
 902         }
 903
 904         url = strbuf_detach(&buf, NULL);
 905
 906         http_init(remote, url, 0);
 907
 908         do {
 909                 if (strbuf_getline(&buf, stdin, '\n') == EOF) {
 910                         if (ferror(stdin))
 911                                 fprintf(stderr, "Error reading command stream\n");
 912                         else
 913                                 fprintf(stderr, "Unexpected end of command stream\n");
 914                         return 1;
 915                 }
 916                 if (buf.len == 0)
 917                         break;
 918                 if (!prefixcmp(buf.buf, "fetch ")) {
 919                         if (nongit)
 920                                 die("Fetch attempted without a local repo");
 921                         parse_fetch(&buf);
 922
 923                 } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
 924                         int for_push = !!strstr(buf.buf + 4, "for-push");
 925                         output_refs(get_refs(for_push));
 926
 927                 } else if (!prefixcmp(buf.buf, "push ")) {
 928                         parse_push(&buf);
 929
 930                 } else if (!prefixcmp(buf.buf, "option ")) {
 931                         char *name = buf.buf + strlen("option ");
 932                         char *value = strchr(name, ' ');
 933                         int result;
 934
 935                         if (value)
 936                                 *value++ = '\0';
 937                         else
 938                                 value = "true";
 939
 940                         result = set_option(name, value);
 941                         if (!result)
 942                                 printf("ok\n");
 943                         else if (result < 0)
 944                                 printf("error invalid value\n");
 945                         else
 946                                 printf("unsupported\n");
 947                         fflush(stdout);
 948
 949                 } else if (!strcmp(buf.buf, "capabilities")) {
 950                         printf("fetch\n");
 951                         printf("option\n");
 952                         printf("push\n");
 953                         printf("\n");
 954                         fflush(stdout);
 955                 } else {
 956                         fprintf(stderr, "Unknown command '%s'\n", buf.buf);
 957                         return 1;
 958                 }
 959                 strbuf_reset(&buf);
 960         } while (1);
 961
 962         http_cleanup();
 963
 964         return 0;
 965 }