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 "string-list.h"
  10 #include "sideband.h"
  11 #include "argv-array.h"
  12 #include "credential.h"
  13 #include "sha1-array.h"
  14
  15 static struct remote *remote;
  16 /* always ends with a trailing slash */
  17 static struct strbuf url = STRBUF_INIT;
  18
  19 struct options {
  20         int verbosity;
  21         unsigned long depth;
  22         unsigned progress : 1,
  23                 check_self_contained_and_connected : 1,
  24                 cloning : 1,
  25                 update_shallow : 1,
  26                 followtags : 1,
  27                 dry_run : 1,
  28                 thin : 1;
  29 };
  30 static struct options options;
  31 static struct string_list cas_options = STRING_LIST_INIT_DUP;
  32
  33 static int set_option(const char *name, const char *value)
  34 {
  35         if (!strcmp(name, "verbosity")) {
  36                 char *end;
  37                 int v = strtol(value, &end, 10);
  38                 if (value == end || *end)
  39                         return -1;
  40                 options.verbosity = v;
  41                 return 0;
  42         }
  43         else if (!strcmp(name, "progress")) {
  44                 if (!strcmp(value, "true"))
  45                         options.progress = 1;
  46                 else if (!strcmp(value, "false"))
  47                         options.progress = 0;
  48                 else
  49                         return -1;
  50                 return 0;
  51         }
  52         else if (!strcmp(name, "depth")) {
  53                 char *end;
  54                 unsigned long v = strtoul(value, &end, 10);
  55                 if (value == end || *end)
  56                         return -1;
  57                 options.depth = v;
  58                 return 0;
  59         }
  60         else if (!strcmp(name, "followtags")) {
  61                 if (!strcmp(value, "true"))
  62                         options.followtags = 1;
  63                 else if (!strcmp(value, "false"))
  64                         options.followtags = 0;
  65                 else
  66                         return -1;
  67                 return 0;
  68         }
  69         else if (!strcmp(name, "dry-run")) {
  70                 if (!strcmp(value, "true"))
  71                         options.dry_run = 1;
  72                 else if (!strcmp(value, "false"))
  73                         options.dry_run = 0;
  74                 else
  75                         return -1;
  76                 return 0;
  77         }
  78         else if (!strcmp(name, "check-connectivity")) {
  79                 if (!strcmp(value, "true"))
  80                         options.check_self_contained_and_connected = 1;
  81                 else if (!strcmp(value, "false"))
  82                         options.check_self_contained_and_connected = 0;
  83                 else
  84                         return -1;
  85                 return 0;
  86         }
  87         else if (!strcmp(name, "cas")) {
  88                 struct strbuf val = STRBUF_INIT;
  89                 strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
  90                 string_list_append(&cas_options, val.buf);
  91                 strbuf_release(&val);
  92                 return 0;
  93         } else if (!strcmp(name, "cloning")) {
  94                 if (!strcmp(value, "true"))
  95                         options.cloning = 1;
  96                 else if (!strcmp(value, "false"))
  97                         options.cloning = 0;
  98                 else
  99                         return -1;
 100                 return 0;
 101         } else if (!strcmp(name, "update-shallow")) {
 102                 if (!strcmp(value, "true"))
 103                         options.update_shallow = 1;
 104                 else if (!strcmp(value, "false"))
 105                         options.update_shallow = 0;
 106                 else
 107                         return -1;
 108                 return 0;
 109         } else {
 110                 return 1 /* unsupported */;
 111         }
 112 }
 113
 114 struct discovery {
 115         const char *service;
 116         char *buf_alloc;
 117         char *buf;
 118         size_t len;
 119         struct ref *refs;
 120         struct sha1_array shallow;
 121         unsigned proto_git : 1;
 122 };
 123 static struct discovery *last_discovery;
 124
 125 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 126 {
 127         struct ref *list = NULL;
 128         get_remote_heads(-1, heads->buf, heads->len, &list,
 129                          for_push ? REF_NORMAL : 0, NULL, &heads->shallow);
 130         return list;
 131 }
 132
 133 static struct ref *parse_info_refs(struct discovery *heads)
 134 {
 135         char *data, *start, *mid;
 136         char *ref_name;
 137         int i = 0;
 138
 139         struct ref *refs = NULL;
 140         struct ref *ref = NULL;
 141         struct ref *last_ref = NULL;
 142
 143         data = heads->buf;
 144         start = NULL;
 145         mid = data;
 146         while (i < heads->len) {
 147                 if (!start) {
 148                         start = &data[i];
 149                 }
 150                 if (data[i] == '\t')
 151                         mid = &data[i];
 152                 if (data[i] == '\n') {
 153                         if (mid - start != 40)
 154                                 die("%sinfo/refs not valid: is this a git repository?",
 155                                     url.buf);
 156                         data[i] = 0;
 157                         ref_name = mid + 1;
 158                         ref = xmalloc(sizeof(struct ref) +
 159                                       strlen(ref_name) + 1);
 160                         memset(ref, 0, sizeof(struct ref));
 161                         strcpy(ref->name, ref_name);
 162                         get_sha1_hex(start, ref->old_sha1);
 163                         if (!refs)
 164                                 refs = ref;
 165                         if (last_ref)
 166                                 last_ref->next = ref;
 167                         last_ref = ref;
 168                         start = NULL;
 169                 }
 170                 i++;
 171         }
 172
 173         ref = alloc_ref("HEAD");
 174         if (!http_fetch_ref(url.buf, ref) &&
 175             !resolve_remote_symref(ref, refs)) {
 176                 ref->next = refs;
 177                 refs = ref;
 178         } else {
 179                 free(ref);
 180         }
 181
 182         return refs;
 183 }
 184
 185 static void free_discovery(struct discovery *d)
 186 {
 187         if (d) {
 188                 if (d == last_discovery)
 189                         last_discovery = NULL;
 190                 free(d->shallow.sha1);
 191                 free(d->buf_alloc);
 192                 free_refs(d->refs);
 193                 free(d);
 194         }
 195 }
 196
 197 static int show_http_message(struct strbuf *type, struct strbuf *msg)
 198 {
 199         const char *p, *eol;
 200
 201         /*
 202          * We only show text/plain parts, as other types are likely
 203          * to be ugly to look at on the user's terminal.
 204          *
 205          * TODO should handle "; charset=XXX", and re-encode into
 206          * logoutputencoding
 207          */
 208         if (strcasecmp(type->buf, "text/plain"))
 209                 return -1;
 210
 211         strbuf_trim(msg);
 212         if (!msg->len)
 213                 return -1;
 214
 215         p = msg->buf;
 216         do {
 217                 eol = strchrnul(p, '\n');
 218                 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 219                 p = eol + 1;
 220         } while(*eol);
 221         return 0;
 222 }
 223
 224 static struct discovery* discover_refs(const char *service, int for_push)
 225 {
 226         struct strbuf exp = STRBUF_INIT;
 227         struct strbuf type = STRBUF_INIT;
 228         struct strbuf buffer = STRBUF_INIT;
 229         struct strbuf refs_url = STRBUF_INIT;
 230         struct strbuf effective_url = STRBUF_INIT;
 231         struct discovery *last = last_discovery;
 232         int http_ret, maybe_smart = 0;
 233         struct http_get_options options;
 234
 235         if (last && !strcmp(service, last->service))
 236                 return last;
 237         free_discovery(last);
 238
 239         strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 240         if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 241              git_env_bool("GIT_SMART_HTTP", 1)) {
 242                 maybe_smart = 1;
 243                 if (!strchr(url.buf, '?'))
 244                         strbuf_addch(&refs_url, '?');
 245                 else
 246                         strbuf_addch(&refs_url, '&');
 247                 strbuf_addf(&refs_url, "service=%s", service);
 248         }
 249
 250         memset(&options, 0, sizeof(options));
 251         options.content_type = &type;
 252         options.effective_url = &effective_url;
 253         options.base_url = &url;
 254         options.no_cache = 1;
 255         options.keep_error = 1;
 256
 257         http_ret = http_get_strbuf(refs_url.buf, &buffer, &options);
 258         switch (http_ret) {
 259         case HTTP_OK:
 260                 break;
 261         case HTTP_MISSING_TARGET:
 262                 show_http_message(&type, &buffer);
 263                 die("repository '%s' not found", url.buf);
 264         case HTTP_NOAUTH:
 265                 show_http_message(&type, &buffer);
 266                 die("Authentication failed for '%s'", url.buf);
 267         default:
 268                 show_http_message(&type, &buffer);
 269                 die("unable to access '%s': %s", url.buf, curl_errorstr);
 270         }
 271
 272         last= xcalloc(1, sizeof(*last_discovery));
 273         last->service = service;
 274         last->buf_alloc = strbuf_detach(&buffer, &last->len);
 275         last->buf = last->buf_alloc;
 276
 277         strbuf_addf(&exp, "application/x-%s-advertisement", service);
 278         if (maybe_smart &&
 279             (5 <= last->len && last->buf[4] == '#') &&
 280             !strbuf_cmp(&exp, &type)) {
 281                 char *line;
 282
 283                 /*
 284                  * smart HTTP response; validate that the service
 285                  * pkt-line matches our request.
 286                  */
 287                 line = packet_read_line_buf(&last->buf, &last->len, NULL);
 288
 289                 strbuf_reset(&exp);
 290                 strbuf_addf(&exp, "# service=%s", service);
 291                 if (strcmp(line, exp.buf))
 292                         die("invalid server response; got '%s'", line);
 293                 strbuf_release(&exp);
 294
 295                 /* The header can include additional metadata lines, up
 296                  * until a packet flush marker.  Ignore these now, but
 297                  * in the future we might start to scan them.
 298                  */
 299                 while (packet_read_line_buf(&last->buf, &last->len, NULL))
 300                         ;
 301
 302                 last->proto_git = 1;
 303         }
 304
 305         if (last->proto_git)
 306                 last->refs = parse_git_refs(last, for_push);
 307         else
 308                 last->refs = parse_info_refs(last);
 309
 310         strbuf_release(&refs_url);
 311         strbuf_release(&exp);
 312         strbuf_release(&type);
 313         strbuf_release(&effective_url);
 314         strbuf_release(&buffer);
 315         last_discovery = last;
 316         return last;
 317 }
 318
 319 static struct ref *get_refs(int for_push)
 320 {
 321         struct discovery *heads;
 322
 323         if (for_push)
 324                 heads = discover_refs("git-receive-pack", for_push);
 325         else
 326                 heads = discover_refs("git-upload-pack", for_push);
 327
 328         return heads->refs;
 329 }
 330
 331 static void output_refs(struct ref *refs)
 332 {
 333         struct ref *posn;
 334         for (posn = refs; posn; posn = posn->next) {
 335                 if (posn->symref)
 336                         printf("@%s %s\n", posn->symref, posn->name);
 337                 else
 338                         printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 339         }
 340         printf("\n");
 341         fflush(stdout);
 342 }
 343
 344 struct rpc_state {
 345         const char *service_name;
 346         const char **argv;
 347         struct strbuf *stdin_preamble;
 348         char *service_url;
 349         char *hdr_content_type;
 350         char *hdr_accept;
 351         char *buf;
 352         size_t alloc;
 353         size_t len;
 354         size_t pos;
 355         int in;
 356         int out;
 357         struct strbuf result;
 358         unsigned gzip_request : 1;
 359         unsigned initial_buffer : 1;
 360 };
 361
 362 static size_t rpc_out(void *ptr, size_t eltsize,
 363                 size_t nmemb, void *buffer_)
 364 {
 365         size_t max = eltsize * nmemb;
 366         struct rpc_state *rpc = buffer_;
 367         size_t avail = rpc->len - rpc->pos;
 368
 369         if (!avail) {
 370                 rpc->initial_buffer = 0;
 371                 avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 372                 if (!avail)
 373                         return 0;
 374                 rpc->pos = 0;
 375                 rpc->len = avail;
 376         }
 377
 378         if (max < avail)
 379                 avail = max;
 380         memcpy(ptr, rpc->buf + rpc->pos, avail);
 381         rpc->pos += avail;
 382         return avail;
 383 }
 384
 385 #ifndef NO_CURL_IOCTL
 386 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 387 {
 388         struct rpc_state *rpc = clientp;
 389
 390         switch (cmd) {
 391         case CURLIOCMD_NOP:
 392                 return CURLIOE_OK;
 393
 394         case CURLIOCMD_RESTARTREAD:
 395                 if (rpc->initial_buffer) {
 396                         rpc->pos = 0;
 397                         return CURLIOE_OK;
 398                 }
 399                 fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
 400                 return CURLIOE_FAILRESTART;
 401
 402         default:
 403                 return CURLIOE_UNKNOWNCMD;
 404         }
 405 }
 406 #endif
 407
 408 static size_t rpc_in(char *ptr, size_t eltsize,
 409                 size_t nmemb, void *buffer_)
 410 {
 411         size_t size = eltsize * nmemb;
 412         struct rpc_state *rpc = buffer_;
 413         write_or_die(rpc->in, ptr, size);
 414         return size;
 415 }
 416
 417 static int run_slot(struct active_request_slot *slot,
 418                     struct slot_results *results)
 419 {
 420         int err;
 421         struct slot_results results_buf;
 422
 423         if (!results)
 424                 results = &results_buf;
 425
 426         slot->results = results;
 427         slot->curl_result = curl_easy_perform(slot->curl);
 428         finish_active_slot(slot);
 429
 430         err = handle_curl_result(results);
 431         if (err != HTTP_OK && err != HTTP_REAUTH) {
 432                 error("RPC failed; result=%d, HTTP code = %ld",
 433                       results->curl_result, results->http_code);
 434         }
 435
 436         return err;
 437 }
 438
 439 static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 440 {
 441         struct active_request_slot *slot;
 442         struct curl_slist *headers = NULL;
 443         struct strbuf buf = STRBUF_INIT;
 444         int err;
 445
 446         slot = get_active_slot();
 447
 448         headers = curl_slist_append(headers, rpc->hdr_content_type);
 449         headers = curl_slist_append(headers, rpc->hdr_accept);
 450
 451         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 452         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 453         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 454         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 455         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 456         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 457         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 458         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 459         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 460
 461         err = run_slot(slot, results);
 462
 463         curl_slist_free_all(headers);
 464         strbuf_release(&buf);
 465         return err;
 466 }
 467
 468 static int post_rpc(struct rpc_state *rpc)
 469 {
 470         struct active_request_slot *slot;
 471         struct curl_slist *headers = NULL;
 472         int use_gzip = rpc->gzip_request;
 473         char *gzip_body = NULL;
 474         size_t gzip_size = 0;
 475         int err, large_request = 0;
 476         int needs_100_continue = 0;
 477
 478         /* Try to load the entire request, if we can fit it into the
 479          * allocated buffer space we can use HTTP/1.0 and avoid the
 480          * chunked encoding mess.
 481          */
 482         while (1) {
 483                 size_t left = rpc->alloc - rpc->len;
 484                 char *buf = rpc->buf + rpc->len;
 485                 int n;
 486
 487                 if (left < LARGE_PACKET_MAX) {
 488                         large_request = 1;
 489                         use_gzip = 0;
 490                         break;
 491                 }
 492
 493                 n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 494                 if (!n)
 495                         break;
 496                 rpc->len += n;
 497         }
 498
 499         if (large_request) {
 500                 struct slot_results results;
 501
 502                 do {
 503                         err = probe_rpc(rpc, &results);
 504                         if (err == HTTP_REAUTH)
 505                                 credential_fill(&http_auth);
 506                 } while (err == HTTP_REAUTH);
 507                 if (err != HTTP_OK)
 508                         return -1;
 509
 510                 if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 511                         needs_100_continue = 1;
 512         }
 513
 514         headers = curl_slist_append(headers, rpc->hdr_content_type);
 515         headers = curl_slist_append(headers, rpc->hdr_accept);
 516         headers = curl_slist_append(headers, needs_100_continue ?
 517                 "Expect: 100-continue" : "Expect:");
 518
 519 retry:
 520         slot = get_active_slot();
 521
 522         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 523         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 524         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 525         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 526
 527         if (large_request) {
 528                 /* The request body is large and the size cannot be predicted.
 529                  * We must use chunked encoding to send it.
 530                  */
 531                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 532                 rpc->initial_buffer = 1;
 533                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 534                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 535 #ifndef NO_CURL_IOCTL
 536                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 537                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 538 #endif
 539                 if (options.verbosity > 1) {
 540                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 541                         fflush(stderr);
 542                 }
 543
 544         } else if (gzip_body) {
 545                 /*
 546                  * If we are looping to retry authentication, then the previous
 547                  * run will have set up the headers and gzip buffer already,
 548                  * and we just need to send it.
 549                  */
 550                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 551                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 552
 553         } else if (use_gzip && 1024 < rpc->len) {
 554                 /* The client backend isn't giving us compressed data so
 555                  * we can try to deflate it ourselves, this may save on.
 556                  * the transfer time.
 557                  */
 558                 git_zstream stream;
 559                 int ret;
 560
 561                 memset(&stream, 0, sizeof(stream));
 562                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 563                 gzip_size = git_deflate_bound(&stream, rpc->len);
 564                 gzip_body = xmalloc(gzip_size);
 565
 566                 stream.next_in = (unsigned char *)rpc->buf;
 567                 stream.avail_in = rpc->len;
 568                 stream.next_out = (unsigned char *)gzip_body;
 569                 stream.avail_out = gzip_size;
 570
 571                 ret = git_deflate(&stream, Z_FINISH);
 572                 if (ret != Z_STREAM_END)
 573                         die("cannot deflate request; zlib deflate error %d", ret);
 574
 575                 ret = git_deflate_end_gently(&stream);
 576                 if (ret != Z_OK)
 577                         die("cannot deflate request; zlib end error %d", ret);
 578
 579                 gzip_size = stream.total_out;
 580
 581                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 582                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 583                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 584
 585                 if (options.verbosity > 1) {
 586                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 587                                 rpc->service_name,
 588                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
 589                         fflush(stderr);
 590                 }
 591         } else {
 592                 /* We know the complete request size in advance, use the
 593                  * more normal Content-Length approach.
 594                  */
 595                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 596                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 597                 if (options.verbosity > 1) {
 598                         fprintf(stderr, "POST %s (%lu bytes)\n",
 599                                 rpc->service_name, (unsigned long)rpc->len);
 600                         fflush(stderr);
 601                 }
 602         }
 603
 604         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 605         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 606         curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 607
 608         err = run_slot(slot, NULL);
 609         if (err == HTTP_REAUTH && !large_request) {
 610                 credential_fill(&http_auth);
 611                 goto retry;
 612         }
 613         if (err != HTTP_OK)
 614                 err = -1;
 615
 616         curl_slist_free_all(headers);
 617         free(gzip_body);
 618         return err;
 619 }
 620
 621 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 622 {
 623         const char *svc = rpc->service_name;
 624         struct strbuf buf = STRBUF_INIT;
 625         struct strbuf *preamble = rpc->stdin_preamble;
 626         struct child_process client;
 627         int err = 0;
 628
 629         memset(&client, 0, sizeof(client));
 630         client.in = -1;
 631         client.out = -1;
 632         client.git_cmd = 1;
 633         client.argv = rpc->argv;
 634         if (start_command(&client))
 635                 exit(1);
 636         if (preamble)
 637                 write_or_die(client.in, preamble->buf, preamble->len);
 638         if (heads)
 639                 write_or_die(client.in, heads->buf, heads->len);
 640
 641         rpc->alloc = http_post_buffer;
 642         rpc->buf = xmalloc(rpc->alloc);
 643         rpc->in = client.in;
 644         rpc->out = client.out;
 645         strbuf_init(&rpc->result, 0);
 646
 647         strbuf_addf(&buf, "%s%s", url.buf, svc);
 648         rpc->service_url = strbuf_detach(&buf, NULL);
 649
 650         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 651         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 652
 653         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 654         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 655
 656         while (!err) {
 657                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 658                 if (!n)
 659                         break;
 660                 rpc->pos = 0;
 661                 rpc->len = n;
 662                 err |= post_rpc(rpc);
 663         }
 664
 665         close(client.in);
 666         client.in = -1;
 667         if (!err) {
 668                 strbuf_read(&rpc->result, client.out, 0);
 669         } else {
 670                 char buf[4096];
 671                 for (;;)
 672                         if (xread(client.out, buf, sizeof(buf)) <= 0)
 673                                 break;
 674         }
 675
 676         close(client.out);
 677         client.out = -1;
 678
 679         err |= finish_command(&client);
 680         free(rpc->service_url);
 681         free(rpc->hdr_content_type);
 682         free(rpc->hdr_accept);
 683         free(rpc->buf);
 684         strbuf_release(&buf);
 685         return err;
 686 }
 687
 688 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 689 {
 690         struct walker *walker;
 691         char **targets = xmalloc(nr_heads * sizeof(char*));
 692         int ret, i;
 693
 694         if (options.depth)
 695                 die("dumb http transport does not support --depth");
 696         for (i = 0; i < nr_heads; i++)
 697                 targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 698
 699         walker = get_http_walker(url.buf);
 700         walker->get_all = 1;
 701         walker->get_tree = 1;
 702         walker->get_history = 1;
 703         walker->get_verbosely = options.verbosity >= 3;
 704         walker->get_recover = 0;
 705         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 706         walker_free(walker);
 707
 708         for (i = 0; i < nr_heads; i++)
 709                 free(targets[i]);
 710         free(targets);
 711
 712         return ret ? error("Fetch failed.") : 0;
 713 }
 714
 715 static int fetch_git(struct discovery *heads,
 716         int nr_heads, struct ref **to_fetch)
 717 {
 718         struct rpc_state rpc;
 719         struct strbuf preamble = STRBUF_INIT;
 720         char *depth_arg = NULL;
 721         int argc = 0, i, err;
 722         const char *argv[17];
 723
 724         argv[argc++] = "fetch-pack";
 725         argv[argc++] = "--stateless-rpc";
 726         argv[argc++] = "--stdin";
 727         argv[argc++] = "--lock-pack";
 728         if (options.followtags)
 729                 argv[argc++] = "--include-tag";
 730         if (options.thin)
 731                 argv[argc++] = "--thin";
 732         if (options.verbosity >= 3) {
 733                 argv[argc++] = "-v";
 734                 argv[argc++] = "-v";
 735         }
 736         if (options.check_self_contained_and_connected)
 737                 argv[argc++] = "--check-self-contained-and-connected";
 738         if (options.cloning)
 739                 argv[argc++] = "--cloning";
 740         if (options.update_shallow)
 741                 argv[argc++] = "--update-shallow";
 742         if (!options.progress)
 743                 argv[argc++] = "--no-progress";
 744         if (options.depth) {
 745                 struct strbuf buf = STRBUF_INIT;
 746                 strbuf_addf(&buf, "--depth=%lu", options.depth);
 747                 depth_arg = strbuf_detach(&buf, NULL);
 748                 argv[argc++] = depth_arg;
 749         }
 750         argv[argc++] = url.buf;
 751         argv[argc++] = NULL;
 752
 753         for (i = 0; i < nr_heads; i++) {
 754                 struct ref *ref = to_fetch[i];
 755                 if (!ref->name || !*ref->name)
 756                         die("cannot fetch by sha1 over smart http");
 757                 packet_buf_write(&preamble, "%s %s\n",
 758                                  sha1_to_hex(ref->old_sha1), ref->name);
 759         }
 760         packet_buf_flush(&preamble);
 761
 762         memset(&rpc, 0, sizeof(rpc));
 763         rpc.service_name = "git-upload-pack",
 764         rpc.argv = argv;
 765         rpc.stdin_preamble = &preamble;
 766         rpc.gzip_request = 1;
 767
 768         err = rpc_service(&rpc, heads);
 769         if (rpc.result.len)
 770                 write_or_die(1, rpc.result.buf, rpc.result.len);
 771         strbuf_release(&rpc.result);
 772         strbuf_release(&preamble);
 773         free(depth_arg);
 774         return err;
 775 }
 776
 777 static int fetch(int nr_heads, struct ref **to_fetch)
 778 {
 779         struct discovery *d = discover_refs("git-upload-pack", 0);
 780         if (d->proto_git)
 781                 return fetch_git(d, nr_heads, to_fetch);
 782         else
 783                 return fetch_dumb(nr_heads, to_fetch);
 784 }
 785
 786 static void parse_fetch(struct strbuf *buf)
 787 {
 788         struct ref **to_fetch = NULL;
 789         struct ref *list_head = NULL;
 790         struct ref **list = &list_head;
 791         int alloc_heads = 0, nr_heads = 0;
 792
 793         do {
 794                 if (starts_with(buf->buf, "fetch ")) {
 795                         char *p = buf->buf + strlen("fetch ");
 796                         char *name;
 797                         struct ref *ref;
 798                         unsigned char old_sha1[20];
 799
 800                         if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 801                                 die("protocol error: expected sha/ref, got %s'", p);
 802                         if (p[40] == ' ')
 803                                 name = p + 41;
 804                         else if (!p[40])
 805                                 name = "";
 806                         else
 807                                 die("protocol error: expected sha/ref, got %s'", p);
 808
 809                         ref = alloc_ref(name);
 810                         hashcpy(ref->old_sha1, old_sha1);
 811
 812                         *list = ref;
 813                         list = &ref->next;
 814
 815                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 816                         to_fetch[nr_heads++] = ref;
 817                 }
 818                 else
 819                         die("http transport does not support %s", buf->buf);
 820
 821                 strbuf_reset(buf);
 822                 if (strbuf_getline(buf, stdin, '\n') == EOF)
 823                         return;
 824                 if (!*buf->buf)
 825                         break;
 826         } while (1);
 827
 828         if (fetch(nr_heads, to_fetch))
 829                 exit(128); /* error already reported */
 830         free_refs(list_head);
 831         free(to_fetch);
 832
 833         printf("\n");
 834         fflush(stdout);
 835         strbuf_reset(buf);
 836 }
 837
 838 static int push_dav(int nr_spec, char **specs)
 839 {
 840         const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 841         int argc = 0, i;
 842
 843         argv[argc++] = "http-push";
 844         argv[argc++] = "--helper-status";
 845         if (options.dry_run)
 846                 argv[argc++] = "--dry-run";
 847         if (options.verbosity > 1)
 848                 argv[argc++] = "--verbose";
 849         argv[argc++] = url.buf;
 850         for (i = 0; i < nr_spec; i++)
 851                 argv[argc++] = specs[i];
 852         argv[argc++] = NULL;
 853
 854         if (run_command_v_opt(argv, RUN_GIT_CMD))
 855                 die("git-%s failed", argv[0]);
 856         free(argv);
 857         return 0;
 858 }
 859
 860 static int push_git(struct discovery *heads, int nr_spec, char **specs)
 861 {
 862         struct rpc_state rpc;
 863         int i, err;
 864         struct argv_array args;
 865         struct string_list_item *cas_option;
 866
 867         argv_array_init(&args);
 868         argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 869                          NULL);
 870
 871         if (options.thin)
 872                 argv_array_push(&args, "--thin");
 873         if (options.dry_run)
 874                 argv_array_push(&args, "--dry-run");
 875         if (options.verbosity == 0)
 876                 argv_array_push(&args, "--quiet");
 877         else if (options.verbosity > 1)
 878                 argv_array_push(&args, "--verbose");
 879         argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 880         for_each_string_list_item(cas_option, &cas_options)
 881                 argv_array_push(&args, cas_option->string);
 882         argv_array_push(&args, url.buf);
 883         for (i = 0; i < nr_spec; i++)
 884                 argv_array_push(&args, specs[i]);
 885
 886         memset(&rpc, 0, sizeof(rpc));
 887         rpc.service_name = "git-receive-pack",
 888         rpc.argv = args.argv;
 889
 890         err = rpc_service(&rpc, heads);
 891         if (rpc.result.len)
 892                 write_or_die(1, rpc.result.buf, rpc.result.len);
 893         strbuf_release(&rpc.result);
 894         argv_array_clear(&args);
 895         return err;
 896 }
 897
 898 static int push(int nr_spec, char **specs)
 899 {
 900         struct discovery *heads = discover_refs("git-receive-pack", 1);
 901         int ret;
 902
 903         if (heads->proto_git)
 904                 ret = push_git(heads, nr_spec, specs);
 905         else
 906                 ret = push_dav(nr_spec, specs);
 907         free_discovery(heads);
 908         return ret;
 909 }
 910
 911 static void parse_push(struct strbuf *buf)
 912 {
 913         char **specs = NULL;
 914         int alloc_spec = 0, nr_spec = 0, i, ret;
 915
 916         do {
 917                 if (starts_with(buf->buf, "push ")) {
 918                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 919                         specs[nr_spec++] = xstrdup(buf->buf + 5);
 920                 }
 921                 else
 922                         die("http transport does not support %s", buf->buf);
 923
 924                 strbuf_reset(buf);
 925                 if (strbuf_getline(buf, stdin, '\n') == EOF)
 926                         goto free_specs;
 927                 if (!*buf->buf)
 928                         break;
 929         } while (1);
 930
 931         ret = push(nr_spec, specs);
 932         printf("\n");
 933         fflush(stdout);
 934
 935         if (ret)
 936                 exit(128); /* error already reported */
 937
 938  free_specs:
 939         for (i = 0; i < nr_spec; i++)
 940                 free(specs[i]);
 941         free(specs);
 942 }
 943
 944 int main(int argc, const char **argv)
 945 {
 946         struct strbuf buf = STRBUF_INIT;
 947         int nongit;
 948
 949         git_extract_argv0_path(argv[0]);
 950         setup_git_directory_gently(&nongit);
 951         if (argc < 2) {
 952                 fprintf(stderr, "Remote needed\n");
 953                 return 1;
 954         }
 955
 956         options.verbosity = 1;
 957         options.progress = !!isatty(2);
 958         options.thin = 1;
 959
 960         remote = remote_get(argv[1]);
 961
 962         if (argc > 2) {
 963                 end_url_with_slash(&url, argv[2]);
 964         } else {
 965                 end_url_with_slash(&url, remote->url[0]);
 966         }
 967
 968         http_init(remote, url.buf, 0);
 969
 970         do {
 971                 if (strbuf_getline(&buf, stdin, '\n') == EOF) {
 972                         if (ferror(stdin))
 973                                 fprintf(stderr, "Error reading command stream\n");
 974                         else
 975                                 fprintf(stderr, "Unexpected end of command stream\n");
 976                         return 1;
 977                 }
 978                 if (buf.len == 0)
 979                         break;
 980                 if (starts_with(buf.buf, "fetch ")) {
 981                         if (nongit)
 982                                 die("Fetch attempted without a local repo");
 983                         parse_fetch(&buf);
 984
 985                 } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
 986                         int for_push = !!strstr(buf.buf + 4, "for-push");
 987                         output_refs(get_refs(for_push));
 988
 989                 } else if (starts_with(buf.buf, "push ")) {
 990                         parse_push(&buf);
 991
 992                 } else if (starts_with(buf.buf, "option ")) {
 993                         char *name = buf.buf + strlen("option ");
 994                         char *value = strchr(name, ' ');
 995                         int result;
 996
 997                         if (value)
 998                                 *value++ = '\0';
 999                         else
1000                                 value = "true";
1001
1002                         result = set_option(name, value);
1003                         if (!result)
1004                                 printf("ok\n");
1005                         else if (result < 0)
1006                                 printf("error invalid value\n");
1007                         else
1008                                 printf("unsupported\n");
1009                         fflush(stdout);
1010
1011                 } else if (!strcmp(buf.buf, "capabilities")) {
1012                         printf("fetch\n");
1013                         printf("option\n");
1014                         printf("push\n");
1015                         printf("check-connectivity\n");
1016                         printf("\n");
1017                         fflush(stdout);
1018                 } else {
1019                         fprintf(stderr, "Unknown command '%s'\n", buf.buf);
1020                         return 1;
1021                 }
1022                 strbuf_reset(&buf);
1023         } while (1);
1024
1025         http_cleanup();
1026
1027         return 0;
1028 }