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

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