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

   1 #include "cache.h"
   2 #include "remote.h"
   3 #include "strbuf.h"
   4 #include "walker.h"
   5 #include "http.h"
   6 #include "exec_cmd.h"
   7 #include "run-command.h"
   8 #include "pkt-line.h"
   9 #include "sideband.h"
  10
  11 static struct remote *remote;
  12 static const char *url; /* always ends with a trailing slash */
  13
  14 struct options {
  15         int verbosity;
  16         unsigned long depth;
  17         unsigned progress : 1,
  18                 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("%s not found: did you run git update-server-info on the"
 214                     " server?", refs_url);
 215         case HTTP_NOAUTH:
 216                 show_http_message(&type, &buffer);
 217                 die("Authentication failed");
 218         default:
 219                 show_http_message(&type, &buffer);
 220                 http_error(refs_url, http_ret);
 221                 die("HTTP request failed");
 222         }
 223
 224         last= xcalloc(1, sizeof(*last_discovery));
 225         last->service = service;
 226         last->buf_alloc = strbuf_detach(&buffer, &last->len);
 227         last->buf = last->buf_alloc;
 228
 229         strbuf_addf(&exp, "application/x-%s-advertisement", service);
 230         if (maybe_smart &&
 231             (5 <= last->len && last->buf[4] == '#') &&
 232             !strbuf_cmp(&exp, &type)) {
 233                 char *line;
 234
 235                 /*
 236                  * smart HTTP response; validate that the service
 237                  * pkt-line matches our request.
 238                  */
 239                 line = packet_read_line_buf(&last->buf, &last->len, NULL);
 240
 241                 strbuf_reset(&exp);
 242                 strbuf_addf(&exp, "# service=%s", service);
 243                 if (strcmp(line, exp.buf))
 244                         die("invalid server response; got '%s'", line);
 245                 strbuf_release(&exp);
 246
 247                 /* The header can include additional metadata lines, up
 248                  * until a packet flush marker.  Ignore these now, but
 249                  * in the future we might start to scan them.
 250                  */
 251                 while (packet_read_line_buf(&last->buf, &last->len, NULL))
 252                         ;
 253
 254                 last->proto_git = 1;
 255         }
 256
 257         if (last->proto_git)
 258                 last->refs = parse_git_refs(last, for_push);
 259         else
 260                 last->refs = parse_info_refs(last);
 261
 262         free(refs_url);
 263         strbuf_release(&exp);
 264         strbuf_release(&type);
 265         strbuf_release(&buffer);
 266         last_discovery = last;
 267         return last;
 268 }
 269
 270 static struct ref *get_refs(int for_push)
 271 {
 272         struct discovery *heads;
 273
 274         if (for_push)
 275                 heads = discover_refs("git-receive-pack", for_push);
 276         else
 277                 heads = discover_refs("git-upload-pack", for_push);
 278
 279         return heads->refs;
 280 }
 281
 282 static void output_refs(struct ref *refs)
 283 {
 284         struct ref *posn;
 285         for (posn = refs; posn; posn = posn->next) {
 286                 if (posn->symref)
 287                         printf("@%s %s\n", posn->symref, posn->name);
 288                 else
 289                         printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 290         }
 291         printf("\n");
 292         fflush(stdout);
 293 }
 294
 295 struct rpc_state {
 296         const char *service_name;
 297         const char **argv;
 298         struct strbuf *stdin_preamble;
 299         char *service_url;
 300         char *hdr_content_type;
 301         char *hdr_accept;
 302         char *buf;
 303         size_t alloc;
 304         size_t len;
 305         size_t pos;
 306         int in;
 307         int out;
 308         struct strbuf result;
 309         unsigned gzip_request : 1;
 310         unsigned initial_buffer : 1;
 311 };
 312
 313 static size_t rpc_out(void *ptr, size_t eltsize,
 314                 size_t nmemb, void *buffer_)
 315 {
 316         size_t max = eltsize * nmemb;
 317         struct rpc_state *rpc = buffer_;
 318         size_t avail = rpc->len - rpc->pos;
 319
 320         if (!avail) {
 321                 rpc->initial_buffer = 0;
 322                 avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 323                 if (!avail)
 324                         return 0;
 325                 rpc->pos = 0;
 326                 rpc->len = avail;
 327         }
 328
 329         if (max < avail)
 330                 avail = max;
 331         memcpy(ptr, rpc->buf + rpc->pos, avail);
 332         rpc->pos += avail;
 333         return avail;
 334 }
 335
 336 #ifndef NO_CURL_IOCTL
 337 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 338 {
 339         struct rpc_state *rpc = clientp;
 340
 341         switch (cmd) {
 342         case CURLIOCMD_NOP:
 343                 return CURLIOE_OK;
 344
 345         case CURLIOCMD_RESTARTREAD:
 346                 if (rpc->initial_buffer) {
 347                         rpc->pos = 0;
 348                         return CURLIOE_OK;
 349                 }
 350                 fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
 351                 return CURLIOE_FAILRESTART;
 352
 353         default:
 354                 return CURLIOE_UNKNOWNCMD;
 355         }
 356 }
 357 #endif
 358
 359 static size_t rpc_in(char *ptr, size_t eltsize,
 360                 size_t nmemb, void *buffer_)
 361 {
 362         size_t size = eltsize * nmemb;
 363         struct rpc_state *rpc = buffer_;
 364         write_or_die(rpc->in, ptr, size);
 365         return size;
 366 }
 367
 368 static int run_slot(struct active_request_slot *slot)
 369 {
 370         int err;
 371         struct slot_results results;
 372
 373         slot->results = &results;
 374         slot->curl_result = curl_easy_perform(slot->curl);
 375         finish_active_slot(slot);
 376
 377         err = handle_curl_result(&results);
 378         if (err != HTTP_OK && err != HTTP_REAUTH) {
 379                 error("RPC failed; result=%d, HTTP code = %ld",
 380                       results.curl_result, results.http_code);
 381         }
 382
 383         return err;
 384 }
 385
 386 static int probe_rpc(struct rpc_state *rpc)
 387 {
 388         struct active_request_slot *slot;
 389         struct curl_slist *headers = NULL;
 390         struct strbuf buf = STRBUF_INIT;
 391         int err;
 392
 393         slot = get_active_slot();
 394
 395         headers = curl_slist_append(headers, rpc->hdr_content_type);
 396         headers = curl_slist_append(headers, rpc->hdr_accept);
 397
 398         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 399         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 400         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 401         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 402         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 403         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 404         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 405         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 406         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 407
 408         err = run_slot(slot);
 409
 410         curl_slist_free_all(headers);
 411         strbuf_release(&buf);
 412         return err;
 413 }
 414
 415 static int post_rpc(struct rpc_state *rpc)
 416 {
 417         struct active_request_slot *slot;
 418         struct curl_slist *headers = NULL;
 419         int use_gzip = rpc->gzip_request;
 420         char *gzip_body = NULL;
 421         size_t gzip_size = 0;
 422         int err, large_request = 0;
 423
 424         /* Try to load the entire request, if we can fit it into the
 425          * allocated buffer space we can use HTTP/1.0 and avoid the
 426          * chunked encoding mess.
 427          */
 428         while (1) {
 429                 size_t left = rpc->alloc - rpc->len;
 430                 char *buf = rpc->buf + rpc->len;
 431                 int n;
 432
 433                 if (left < LARGE_PACKET_MAX) {
 434                         large_request = 1;
 435                         use_gzip = 0;
 436                         break;
 437                 }
 438
 439                 n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 440                 if (!n)
 441                         break;
 442                 rpc->len += n;
 443         }
 444
 445         if (large_request) {
 446                 do {
 447                         err = probe_rpc(rpc);
 448                 } while (err == HTTP_REAUTH);
 449                 if (err != HTTP_OK)
 450                         return -1;
 451         }
 452
 453         headers = curl_slist_append(headers, rpc->hdr_content_type);
 454         headers = curl_slist_append(headers, rpc->hdr_accept);
 455         headers = curl_slist_append(headers, "Expect:");
 456
 457 retry:
 458         slot = get_active_slot();
 459
 460         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 461         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 462         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 463         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 464
 465         if (large_request) {
 466                 /* The request body is large and the size cannot be predicted.
 467                  * We must use chunked encoding to send it.
 468                  */
 469                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 470                 rpc->initial_buffer = 1;
 471                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 472                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 473 #ifndef NO_CURL_IOCTL
 474                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 475                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 476 #endif
 477                 if (options.verbosity > 1) {
 478                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 479                         fflush(stderr);
 480                 }
 481
 482         } else if (gzip_body) {
 483                 /*
 484                  * If we are looping to retry authentication, then the previous
 485                  * run will have set up the headers and gzip buffer already,
 486                  * and we just need to send it.
 487                  */
 488                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 489                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 490
 491         } else if (use_gzip && 1024 < rpc->len) {
 492                 /* The client backend isn't giving us compressed data so
 493                  * we can try to deflate it ourselves, this may save on.
 494                  * the transfer time.
 495                  */
 496                 git_zstream stream;
 497                 int ret;
 498
 499                 memset(&stream, 0, sizeof(stream));
 500                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 501                 gzip_size = git_deflate_bound(&stream, rpc->len);
 502                 gzip_body = xmalloc(gzip_size);
 503
 504                 stream.next_in = (unsigned char *)rpc->buf;
 505                 stream.avail_in = rpc->len;
 506                 stream.next_out = (unsigned char *)gzip_body;
 507                 stream.avail_out = gzip_size;
 508
 509                 ret = git_deflate(&stream, Z_FINISH);
 510                 if (ret != Z_STREAM_END)
 511                         die("cannot deflate request; zlib deflate error %d", ret);
 512
 513                 ret = git_deflate_end_gently(&stream);
 514                 if (ret != Z_OK)
 515                         die("cannot deflate request; zlib end error %d", ret);
 516
 517                 gzip_size = stream.total_out;
 518
 519                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 520                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 521                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 522
 523                 if (options.verbosity > 1) {
 524                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 525                                 rpc->service_name,
 526                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
 527                         fflush(stderr);
 528                 }
 529         } else {
 530                 /* We know the complete request size in advance, use the
 531                  * more normal Content-Length approach.
 532                  */
 533                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 534                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 535                 if (options.verbosity > 1) {
 536                         fprintf(stderr, "POST %s (%lu bytes)\n",
 537                                 rpc->service_name, (unsigned long)rpc->len);
 538                         fflush(stderr);
 539                 }
 540         }
 541
 542         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 543         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 544         curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 545
 546         err = run_slot(slot);
 547         if (err == HTTP_REAUTH && !large_request)
 548                 goto retry;
 549         if (err != HTTP_OK)
 550                 err = -1;
 551
 552         curl_slist_free_all(headers);
 553         free(gzip_body);
 554         return err;
 555 }
 556
 557 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 558 {
 559         const char *svc = rpc->service_name;
 560         struct strbuf buf = STRBUF_INIT;
 561         struct strbuf *preamble = rpc->stdin_preamble;
 562         struct child_process client;
 563         int err = 0;
 564
 565         memset(&client, 0, sizeof(client));
 566         client.in = -1;
 567         client.out = -1;
 568         client.git_cmd = 1;
 569         client.argv = rpc->argv;
 570         if (start_command(&client))
 571                 exit(1);
 572         if (preamble)
 573                 write_or_die(client.in, preamble->buf, preamble->len);
 574         if (heads)
 575                 write_or_die(client.in, heads->buf, heads->len);
 576
 577         rpc->alloc = http_post_buffer;
 578         rpc->buf = xmalloc(rpc->alloc);
 579         rpc->in = client.in;
 580         rpc->out = client.out;
 581         strbuf_init(&rpc->result, 0);
 582
 583         strbuf_addf(&buf, "%s%s", url, svc);
 584         rpc->service_url = strbuf_detach(&buf, NULL);
 585
 586         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 587         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 588
 589         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 590         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 591
 592         while (!err) {
 593                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 594                 if (!n)
 595                         break;
 596                 rpc->pos = 0;
 597                 rpc->len = n;
 598                 err |= post_rpc(rpc);
 599         }
 600
 601         close(client.in);
 602         client.in = -1;
 603         if (!err) {
 604                 strbuf_read(&rpc->result, client.out, 0);
 605         } else {
 606                 char buf[4096];
 607                 for (;;)
 608                         if (xread(client.out, buf, sizeof(buf)) <= 0)
 609                                 break;
 610         }
 611
 612         close(client.out);
 613         client.out = -1;
 614
 615         err |= finish_command(&client);
 616         free(rpc->service_url);
 617         free(rpc->hdr_content_type);
 618         free(rpc->hdr_accept);
 619         free(rpc->buf);
 620         strbuf_release(&buf);
 621         return err;
 622 }
 623
 624 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 625 {
 626         struct walker *walker;
 627         char **targets = xmalloc(nr_heads * sizeof(char*));
 628         int ret, i;
 629
 630         if (options.depth)
 631                 die("dumb http transport does not support --depth");
 632         for (i = 0; i < nr_heads; i++)
 633                 targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 634
 635         walker = get_http_walker(url);
 636         walker->get_all = 1;
 637         walker->get_tree = 1;
 638         walker->get_history = 1;
 639         walker->get_verbosely = options.verbosity >= 3;
 640         walker->get_recover = 0;
 641         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 642         walker_free(walker);
 643
 644         for (i = 0; i < nr_heads; i++)
 645                 free(targets[i]);
 646         free(targets);
 647
 648         return ret ? error("Fetch failed.") : 0;
 649 }
 650
 651 static int fetch_git(struct discovery *heads,
 652         int nr_heads, struct ref **to_fetch)
 653 {
 654         struct rpc_state rpc;
 655         struct strbuf preamble = STRBUF_INIT;
 656         char *depth_arg = NULL;
 657         int argc = 0, i, err;
 658         const char *argv[15];
 659
 660         argv[argc++] = "fetch-pack";
 661         argv[argc++] = "--stateless-rpc";
 662         argv[argc++] = "--stdin";
 663         argv[argc++] = "--lock-pack";
 664         if (options.followtags)
 665                 argv[argc++] = "--include-tag";
 666         if (options.thin)
 667                 argv[argc++] = "--thin";
 668         if (options.verbosity >= 3) {
 669                 argv[argc++] = "-v";
 670                 argv[argc++] = "-v";
 671         }
 672         if (!options.progress)
 673                 argv[argc++] = "--no-progress";
 674         if (options.depth) {
 675                 struct strbuf buf = STRBUF_INIT;
 676                 strbuf_addf(&buf, "--depth=%lu", options.depth);
 677                 depth_arg = strbuf_detach(&buf, NULL);
 678                 argv[argc++] = depth_arg;
 679         }
 680         argv[argc++] = url;
 681         argv[argc++] = NULL;
 682
 683         for (i = 0; i < nr_heads; i++) {
 684                 struct ref *ref = to_fetch[i];
 685                 if (!ref->name || !*ref->name)
 686                         die("cannot fetch by sha1 over smart http");
 687                 packet_buf_write(&preamble, "%s\n", ref->name);
 688         }
 689         packet_buf_flush(&preamble);
 690
 691         memset(&rpc, 0, sizeof(rpc));
 692         rpc.service_name = "git-upload-pack",
 693         rpc.argv = argv;
 694         rpc.stdin_preamble = &preamble;
 695         rpc.gzip_request = 1;
 696
 697         err = rpc_service(&rpc, heads);
 698         if (rpc.result.len)
 699                 write_or_die(1, rpc.result.buf, rpc.result.len);
 700         strbuf_release(&rpc.result);
 701         strbuf_release(&preamble);
 702         free(depth_arg);
 703         return err;
 704 }
 705
 706 static int fetch(int nr_heads, struct ref **to_fetch)
 707 {
 708         struct discovery *d = discover_refs("git-upload-pack", 0);
 709         if (d->proto_git)
 710                 return fetch_git(d, nr_heads, to_fetch);
 711         else
 712                 return fetch_dumb(nr_heads, to_fetch);
 713 }
 714
 715 static void parse_fetch(struct strbuf *buf)
 716 {
 717         struct ref **to_fetch = NULL;
 718         struct ref *list_head = NULL;
 719         struct ref **list = &list_head;
 720         int alloc_heads = 0, nr_heads = 0;
 721
 722         do {
 723                 if (!prefixcmp(buf->buf, "fetch ")) {
 724                         char *p = buf->buf + strlen("fetch ");
 725                         char *name;
 726                         struct ref *ref;
 727                         unsigned char old_sha1[20];
 728
 729                         if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 730                                 die("protocol error: expected sha/ref, got %s'", p);
 731                         if (p[40] == ' ')
 732                                 name = p + 41;
 733                         else if (!p[40])
 734                                 name = "";
 735                         else
 736                                 die("protocol error: expected sha/ref, got %s'", p);
 737
 738                         ref = alloc_ref(name);
 739                         hashcpy(ref->old_sha1, old_sha1);
 740
 741                         *list = ref;
 742                         list = &ref->next;
 743
 744                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 745                         to_fetch[nr_heads++] = ref;
 746                 }
 747                 else
 748                         die("http transport does not support %s", buf->buf);
 749
 750                 strbuf_reset(buf);
 751                 if (strbuf_getline(buf, stdin, '\n') == EOF)
 752                         return;
 753                 if (!*buf->buf)
 754                         break;
 755         } while (1);
 756
 757         if (fetch(nr_heads, to_fetch))
 758                 exit(128); /* error already reported */
 759         free_refs(list_head);
 760         free(to_fetch);
 761
 762         printf("\n");
 763         fflush(stdout);
 764         strbuf_reset(buf);
 765 }
 766
 767 static int push_dav(int nr_spec, char **specs)
 768 {
 769         const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 770         int argc = 0, i;
 771
 772         argv[argc++] = "http-push";
 773         argv[argc++] = "--helper-status";
 774         if (options.dry_run)
 775                 argv[argc++] = "--dry-run";
 776         if (options.verbosity > 1)
 777                 argv[argc++] = "--verbose";
 778         argv[argc++] = url;
 779         for (i = 0; i < nr_spec; i++)
 780                 argv[argc++] = specs[i];
 781         argv[argc++] = NULL;
 782
 783         if (run_command_v_opt(argv, RUN_GIT_CMD))
 784                 die("git-%s failed", argv[0]);
 785         free(argv);
 786         return 0;
 787 }
 788
 789 static int push_git(struct discovery *heads, int nr_spec, char **specs)
 790 {
 791         struct rpc_state rpc;
 792         const char **argv;
 793         int argc = 0, i, err;
 794
 795         argv = xmalloc((10 + nr_spec) * sizeof(char*));
 796         argv[argc++] = "send-pack";
 797         argv[argc++] = "--stateless-rpc";
 798         argv[argc++] = "--helper-status";
 799         if (options.thin)
 800                 argv[argc++] = "--thin";
 801         if (options.dry_run)
 802                 argv[argc++] = "--dry-run";
 803         if (options.verbosity == 0)
 804                 argv[argc++] = "--quiet";
 805         else if (options.verbosity > 1)
 806                 argv[argc++] = "--verbose";
 807         argv[argc++] = options.progress ? "--progress" : "--no-progress";
 808         argv[argc++] = url;
 809         for (i = 0; i < nr_spec; i++)
 810                 argv[argc++] = specs[i];
 811         argv[argc++] = NULL;
 812
 813         memset(&rpc, 0, sizeof(rpc));
 814         rpc.service_name = "git-receive-pack",
 815         rpc.argv = argv;
 816
 817         err = rpc_service(&rpc, heads);
 818         if (rpc.result.len)
 819                 write_or_die(1, rpc.result.buf, rpc.result.len);
 820         strbuf_release(&rpc.result);
 821         free(argv);
 822         return err;
 823 }
 824
 825 static int push(int nr_spec, char **specs)
 826 {
 827         struct discovery *heads = discover_refs("git-receive-pack", 1);
 828         int ret;
 829
 830         if (heads->proto_git)
 831                 ret = push_git(heads, nr_spec, specs);
 832         else
 833                 ret = push_dav(nr_spec, specs);
 834         free_discovery(heads);
 835         return ret;
 836 }
 837
 838 static void parse_push(struct strbuf *buf)
 839 {
 840         char **specs = NULL;
 841         int alloc_spec = 0, nr_spec = 0, i, ret;
 842
 843         do {
 844                 if (!prefixcmp(buf->buf, "push ")) {
 845                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 846                         specs[nr_spec++] = xstrdup(buf->buf + 5);
 847                 }
 848                 else
 849                         die("http transport does not support %s", buf->buf);
 850
 851                 strbuf_reset(buf);
 852                 if (strbuf_getline(buf, stdin, '\n') == EOF)
 853                         goto free_specs;
 854                 if (!*buf->buf)
 855                         break;
 856         } while (1);
 857
 858         ret = push(nr_spec, specs);
 859         printf("\n");
 860         fflush(stdout);
 861
 862         if (ret)
 863                 exit(128); /* error already reported */
 864
 865  free_specs:
 866         for (i = 0; i < nr_spec; i++)
 867                 free(specs[i]);
 868         free(specs);
 869 }
 870
 871 int main(int argc, const char **argv)
 872 {
 873         struct strbuf buf = STRBUF_INIT;
 874         int nongit;
 875
 876         git_extract_argv0_path(argv[0]);
 877         setup_git_directory_gently(&nongit);
 878         if (argc < 2) {
 879                 fprintf(stderr, "Remote needed\n");
 880                 return 1;
 881         }
 882
 883         options.verbosity = 1;
 884         options.progress = !!isatty(2);
 885         options.thin = 1;
 886
 887         remote = remote_get(argv[1]);
 888
 889         if (argc > 2) {
 890                 end_url_with_slash(&buf, argv[2]);
 891         } else {
 892                 end_url_with_slash(&buf, remote->url[0]);
 893         }
 894
 895         url = strbuf_detach(&buf, NULL);
 896
 897         http_init(remote, url, 0);
 898
 899         do {
 900                 if (strbuf_getline(&buf, stdin, '\n') == EOF) {
 901                         if (ferror(stdin))
 902                                 fprintf(stderr, "Error reading command stream\n");
 903                         else
 904                                 fprintf(stderr, "Unexpected end of command stream\n");
 905                         return 1;
 906                 }
 907                 if (buf.len == 0)
 908                         break;
 909                 if (!prefixcmp(buf.buf, "fetch ")) {
 910                         if (nongit)
 911                                 die("Fetch attempted without a local repo");
 912                         parse_fetch(&buf);
 913
 914                 } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
 915                         int for_push = !!strstr(buf.buf + 4, "for-push");
 916                         output_refs(get_refs(for_push));
 917
 918                 } else if (!prefixcmp(buf.buf, "push ")) {
 919                         parse_push(&buf);
 920
 921                 } else if (!prefixcmp(buf.buf, "option ")) {
 922                         char *name = buf.buf + strlen("option ");
 923                         char *value = strchr(name, ' ');
 924                         int result;
 925
 926                         if (value)
 927                                 *value++ = '\0';
 928                         else
 929                                 value = "true";
 930
 931                         result = set_option(name, value);
 932                         if (!result)
 933                                 printf("ok\n");
 934                         else if (result < 0)
 935                                 printf("error invalid value\n");
 936                         else
 937                                 printf("unsupported\n");
 938                         fflush(stdout);
 939
 940                 } else if (!strcmp(buf.buf, "capabilities")) {
 941                         printf("fetch\n");
 942                         printf("option\n");
 943                         printf("push\n");
 944                         printf("\n");
 945                         fflush(stdout);
 946                 } else {
 947                         fprintf(stderr, "Unknown command '%s'\n", buf.buf);
 948                         return 1;
 949                 }
 950                 strbuf_reset(&buf);
 951         } while (1);
 952
 953         http_cleanup();
 954
 955         return 0;
 956 }