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 #include "send-pack.h"
  15
  16 static struct remote *remote;
  17 /* always ends with a trailing slash */
  18 static struct strbuf url = STRBUF_INIT;
  19
  20 struct options {
  21         int verbosity;
  22         unsigned long depth;
  23         char *deepen_since;
  24         unsigned progress : 1,
  25                 check_self_contained_and_connected : 1,
  26                 cloning : 1,
  27                 update_shallow : 1,
  28                 followtags : 1,
  29                 dry_run : 1,
  30                 thin : 1,
  31                 /* One of the SEND_PACK_PUSH_CERT_* constants. */
  32                 push_cert : 2;
  33 };
  34 static struct options options;
  35 static struct string_list cas_options = STRING_LIST_INIT_DUP;
  36
  37 static int set_option(const char *name, const char *value)
  38 {
  39         if (!strcmp(name, "verbosity")) {
  40                 char *end;
  41                 int v = strtol(value, &end, 10);
  42                 if (value == end || *end)
  43                         return -1;
  44                 options.verbosity = v;
  45                 return 0;
  46         }
  47         else if (!strcmp(name, "progress")) {
  48                 if (!strcmp(value, "true"))
  49                         options.progress = 1;
  50                 else if (!strcmp(value, "false"))
  51                         options.progress = 0;
  52                 else
  53                         return -1;
  54                 return 0;
  55         }
  56         else if (!strcmp(name, "depth")) {
  57                 char *end;
  58                 unsigned long v = strtoul(value, &end, 10);
  59                 if (value == end || *end)
  60                         return -1;
  61                 options.depth = v;
  62                 return 0;
  63         }
  64         else if (!strcmp(name, "deepen-since")) {
  65                 options.deepen_since = xstrdup(value);
  66                 return 0;
  67         }
  68         else if (!strcmp(name, "followtags")) {
  69                 if (!strcmp(value, "true"))
  70                         options.followtags = 1;
  71                 else if (!strcmp(value, "false"))
  72                         options.followtags = 0;
  73                 else
  74                         return -1;
  75                 return 0;
  76         }
  77         else if (!strcmp(name, "dry-run")) {
  78                 if (!strcmp(value, "true"))
  79                         options.dry_run = 1;
  80                 else if (!strcmp(value, "false"))
  81                         options.dry_run = 0;
  82                 else
  83                         return -1;
  84                 return 0;
  85         }
  86         else if (!strcmp(name, "check-connectivity")) {
  87                 if (!strcmp(value, "true"))
  88                         options.check_self_contained_and_connected = 1;
  89                 else if (!strcmp(value, "false"))
  90                         options.check_self_contained_and_connected = 0;
  91                 else
  92                         return -1;
  93                 return 0;
  94         }
  95         else if (!strcmp(name, "cas")) {
  96                 struct strbuf val = STRBUF_INIT;
  97                 strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
  98                 string_list_append(&cas_options, val.buf);
  99                 strbuf_release(&val);
 100                 return 0;
 101         } else if (!strcmp(name, "cloning")) {
 102                 if (!strcmp(value, "true"))
 103                         options.cloning = 1;
 104                 else if (!strcmp(value, "false"))
 105                         options.cloning = 0;
 106                 else
 107                         return -1;
 108                 return 0;
 109         } else if (!strcmp(name, "update-shallow")) {
 110                 if (!strcmp(value, "true"))
 111                         options.update_shallow = 1;
 112                 else if (!strcmp(value, "false"))
 113                         options.update_shallow = 0;
 114                 else
 115                         return -1;
 116                 return 0;
 117         } else if (!strcmp(name, "pushcert")) {
 118                 if (!strcmp(value, "true"))
 119                         options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 120                 else if (!strcmp(value, "false"))
 121                         options.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 122                 else if (!strcmp(value, "if-asked"))
 123                         options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 124                 else
 125                         return -1;
 126                 return 0;
 127         } else {
 128                 return 1 /* unsupported */;
 129         }
 130 }
 131
 132 struct discovery {
 133         const char *service;
 134         char *buf_alloc;
 135         char *buf;
 136         size_t len;
 137         struct ref *refs;
 138         struct sha1_array shallow;
 139         unsigned proto_git : 1;
 140 };
 141 static struct discovery *last_discovery;
 142
 143 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 144 {
 145         struct ref *list = NULL;
 146         get_remote_heads(-1, heads->buf, heads->len, &list,
 147                          for_push ? REF_NORMAL : 0, NULL, &heads->shallow);
 148         return list;
 149 }
 150
 151 static struct ref *parse_info_refs(struct discovery *heads)
 152 {
 153         char *data, *start, *mid;
 154         char *ref_name;
 155         int i = 0;
 156
 157         struct ref *refs = NULL;
 158         struct ref *ref = NULL;
 159         struct ref *last_ref = NULL;
 160
 161         data = heads->buf;
 162         start = NULL;
 163         mid = data;
 164         while (i < heads->len) {
 165                 if (!start) {
 166                         start = &data[i];
 167                 }
 168                 if (data[i] == '\t')
 169                         mid = &data[i];
 170                 if (data[i] == '\n') {
 171                         if (mid - start != 40)
 172                                 die("%sinfo/refs not valid: is this a git repository?",
 173                                     url.buf);
 174                         data[i] = 0;
 175                         ref_name = mid + 1;
 176                         ref = alloc_ref(ref_name);
 177                         get_oid_hex(start, &ref->old_oid);
 178                         if (!refs)
 179                                 refs = ref;
 180                         if (last_ref)
 181                                 last_ref->next = ref;
 182                         last_ref = ref;
 183                         start = NULL;
 184                 }
 185                 i++;
 186         }
 187
 188         ref = alloc_ref("HEAD");
 189         if (!http_fetch_ref(url.buf, ref) &&
 190             !resolve_remote_symref(ref, refs)) {
 191                 ref->next = refs;
 192                 refs = ref;
 193         } else {
 194                 free(ref);
 195         }
 196
 197         return refs;
 198 }
 199
 200 static void free_discovery(struct discovery *d)
 201 {
 202         if (d) {
 203                 if (d == last_discovery)
 204                         last_discovery = NULL;
 205                 free(d->shallow.sha1);
 206                 free(d->buf_alloc);
 207                 free_refs(d->refs);
 208                 free(d);
 209         }
 210 }
 211
 212 static int show_http_message(struct strbuf *type, struct strbuf *charset,
 213                              struct strbuf *msg)
 214 {
 215         const char *p, *eol;
 216
 217         /*
 218          * We only show text/plain parts, as other types are likely
 219          * to be ugly to look at on the user's terminal.
 220          */
 221         if (strcmp(type->buf, "text/plain"))
 222                 return -1;
 223         if (charset->len)
 224                 strbuf_reencode(msg, charset->buf, get_log_output_encoding());
 225
 226         strbuf_trim(msg);
 227         if (!msg->len)
 228                 return -1;
 229
 230         p = msg->buf;
 231         do {
 232                 eol = strchrnul(p, '\n');
 233                 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 234                 p = eol + 1;
 235         } while(*eol);
 236         return 0;
 237 }
 238
 239 static struct discovery *discover_refs(const char *service, int for_push)
 240 {
 241         struct strbuf exp = STRBUF_INIT;
 242         struct strbuf type = STRBUF_INIT;
 243         struct strbuf charset = STRBUF_INIT;
 244         struct strbuf buffer = STRBUF_INIT;
 245         struct strbuf refs_url = STRBUF_INIT;
 246         struct strbuf effective_url = STRBUF_INIT;
 247         struct discovery *last = last_discovery;
 248         int http_ret, maybe_smart = 0;
 249         struct http_get_options options;
 250
 251         if (last && !strcmp(service, last->service))
 252                 return last;
 253         free_discovery(last);
 254
 255         strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 256         if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 257              git_env_bool("GIT_SMART_HTTP", 1)) {
 258                 maybe_smart = 1;
 259                 if (!strchr(url.buf, '?'))
 260                         strbuf_addch(&refs_url, '?');
 261                 else
 262                         strbuf_addch(&refs_url, '&');
 263                 strbuf_addf(&refs_url, "service=%s", service);
 264         }
 265
 266         memset(&options, 0, sizeof(options));
 267         options.content_type = &type;
 268         options.charset = &charset;
 269         options.effective_url = &effective_url;
 270         options.base_url = &url;
 271         options.no_cache = 1;
 272         options.keep_error = 1;
 273
 274         http_ret = http_get_strbuf(refs_url.buf, &buffer, &options);
 275         switch (http_ret) {
 276         case HTTP_OK:
 277                 break;
 278         case HTTP_MISSING_TARGET:
 279                 show_http_message(&type, &charset, &buffer);
 280                 die("repository '%s' not found", url.buf);
 281         case HTTP_NOAUTH:
 282                 show_http_message(&type, &charset, &buffer);
 283                 die("Authentication failed for '%s'", url.buf);
 284         default:
 285                 show_http_message(&type, &charset, &buffer);
 286                 die("unable to access '%s': %s", url.buf, curl_errorstr);
 287         }
 288
 289         last= xcalloc(1, sizeof(*last_discovery));
 290         last->service = service;
 291         last->buf_alloc = strbuf_detach(&buffer, &last->len);
 292         last->buf = last->buf_alloc;
 293
 294         strbuf_addf(&exp, "application/x-%s-advertisement", service);
 295         if (maybe_smart &&
 296             (5 <= last->len && last->buf[4] == '#') &&
 297             !strbuf_cmp(&exp, &type)) {
 298                 char *line;
 299
 300                 /*
 301                  * smart HTTP response; validate that the service
 302                  * pkt-line matches our request.
 303                  */
 304                 line = packet_read_line_buf(&last->buf, &last->len, NULL);
 305
 306                 strbuf_reset(&exp);
 307                 strbuf_addf(&exp, "# service=%s", service);
 308                 if (strcmp(line, exp.buf))
 309                         die("invalid server response; got '%s'", line);
 310                 strbuf_release(&exp);
 311
 312                 /* The header can include additional metadata lines, up
 313                  * until a packet flush marker.  Ignore these now, but
 314                  * in the future we might start to scan them.
 315                  */
 316                 while (packet_read_line_buf(&last->buf, &last->len, NULL))
 317                         ;
 318
 319                 last->proto_git = 1;
 320         }
 321
 322         if (last->proto_git)
 323                 last->refs = parse_git_refs(last, for_push);
 324         else
 325                 last->refs = parse_info_refs(last);
 326
 327         strbuf_release(&refs_url);
 328         strbuf_release(&exp);
 329         strbuf_release(&type);
 330         strbuf_release(&charset);
 331         strbuf_release(&effective_url);
 332         strbuf_release(&buffer);
 333         last_discovery = last;
 334         return last;
 335 }
 336
 337 static struct ref *get_refs(int for_push)
 338 {
 339         struct discovery *heads;
 340
 341         if (for_push)
 342                 heads = discover_refs("git-receive-pack", for_push);
 343         else
 344                 heads = discover_refs("git-upload-pack", for_push);
 345
 346         return heads->refs;
 347 }
 348
 349 static void output_refs(struct ref *refs)
 350 {
 351         struct ref *posn;
 352         for (posn = refs; posn; posn = posn->next) {
 353                 if (posn->symref)
 354                         printf("@%s %s\n", posn->symref, posn->name);
 355                 else
 356                         printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name);
 357         }
 358         printf("\n");
 359         fflush(stdout);
 360 }
 361
 362 struct rpc_state {
 363         const char *service_name;
 364         const char **argv;
 365         struct strbuf *stdin_preamble;
 366         char *service_url;
 367         char *hdr_content_type;
 368         char *hdr_accept;
 369         char *buf;
 370         size_t alloc;
 371         size_t len;
 372         size_t pos;
 373         int in;
 374         int out;
 375         struct strbuf result;
 376         unsigned gzip_request : 1;
 377         unsigned initial_buffer : 1;
 378 };
 379
 380 static size_t rpc_out(void *ptr, size_t eltsize,
 381                 size_t nmemb, void *buffer_)
 382 {
 383         size_t max = eltsize * nmemb;
 384         struct rpc_state *rpc = buffer_;
 385         size_t avail = rpc->len - rpc->pos;
 386
 387         if (!avail) {
 388                 rpc->initial_buffer = 0;
 389                 avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 390                 if (!avail)
 391                         return 0;
 392                 rpc->pos = 0;
 393                 rpc->len = avail;
 394         }
 395
 396         if (max < avail)
 397                 avail = max;
 398         memcpy(ptr, rpc->buf + rpc->pos, avail);
 399         rpc->pos += avail;
 400         return avail;
 401 }
 402
 403 #ifndef NO_CURL_IOCTL
 404 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 405 {
 406         struct rpc_state *rpc = clientp;
 407
 408         switch (cmd) {
 409         case CURLIOCMD_NOP:
 410                 return CURLIOE_OK;
 411
 412         case CURLIOCMD_RESTARTREAD:
 413                 if (rpc->initial_buffer) {
 414                         rpc->pos = 0;
 415                         return CURLIOE_OK;
 416                 }
 417                 error("unable to rewind rpc post data - try increasing http.postBuffer");
 418                 return CURLIOE_FAILRESTART;
 419
 420         default:
 421                 return CURLIOE_UNKNOWNCMD;
 422         }
 423 }
 424 #endif
 425
 426 static size_t rpc_in(char *ptr, size_t eltsize,
 427                 size_t nmemb, void *buffer_)
 428 {
 429         size_t size = eltsize * nmemb;
 430         struct rpc_state *rpc = buffer_;
 431         write_or_die(rpc->in, ptr, size);
 432         return size;
 433 }
 434
 435 static int run_slot(struct active_request_slot *slot,
 436                     struct slot_results *results)
 437 {
 438         int err;
 439         struct slot_results results_buf;
 440
 441         if (!results)
 442                 results = &results_buf;
 443
 444         err = run_one_slot(slot, results);
 445
 446         if (err != HTTP_OK && err != HTTP_REAUTH) {
 447                 error("RPC failed; result=%d, HTTP code = %ld",
 448                       results->curl_result, results->http_code);
 449         }
 450
 451         return err;
 452 }
 453
 454 static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 455 {
 456         struct active_request_slot *slot;
 457         struct curl_slist *headers = NULL;
 458         struct strbuf buf = STRBUF_INIT;
 459         int err;
 460
 461         slot = get_active_slot();
 462
 463         headers = curl_slist_append(headers, rpc->hdr_content_type);
 464         headers = curl_slist_append(headers, rpc->hdr_accept);
 465
 466         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 467         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 468         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 469         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 470         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 471         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 472         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 473         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 474         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 475
 476         err = run_slot(slot, results);
 477
 478         curl_slist_free_all(headers);
 479         strbuf_release(&buf);
 480         return err;
 481 }
 482
 483 static int post_rpc(struct rpc_state *rpc)
 484 {
 485         struct active_request_slot *slot;
 486         struct curl_slist *headers = NULL;
 487         int use_gzip = rpc->gzip_request;
 488         char *gzip_body = NULL;
 489         size_t gzip_size = 0;
 490         int err, large_request = 0;
 491         int needs_100_continue = 0;
 492
 493         /* Try to load the entire request, if we can fit it into the
 494          * allocated buffer space we can use HTTP/1.0 and avoid the
 495          * chunked encoding mess.
 496          */
 497         while (1) {
 498                 size_t left = rpc->alloc - rpc->len;
 499                 char *buf = rpc->buf + rpc->len;
 500                 int n;
 501
 502                 if (left < LARGE_PACKET_MAX) {
 503                         large_request = 1;
 504                         use_gzip = 0;
 505                         break;
 506                 }
 507
 508                 n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 509                 if (!n)
 510                         break;
 511                 rpc->len += n;
 512         }
 513
 514         if (large_request) {
 515                 struct slot_results results;
 516
 517                 do {
 518                         err = probe_rpc(rpc, &results);
 519                         if (err == HTTP_REAUTH)
 520                                 credential_fill(&http_auth);
 521                 } while (err == HTTP_REAUTH);
 522                 if (err != HTTP_OK)
 523                         return -1;
 524
 525                 if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 526                         needs_100_continue = 1;
 527         }
 528
 529         headers = curl_slist_append(headers, rpc->hdr_content_type);
 530         headers = curl_slist_append(headers, rpc->hdr_accept);
 531         headers = curl_slist_append(headers, needs_100_continue ?
 532                 "Expect: 100-continue" : "Expect:");
 533
 534 retry:
 535         slot = get_active_slot();
 536
 537         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 538         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 539         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 540         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 541
 542         if (large_request) {
 543                 /* The request body is large and the size cannot be predicted.
 544                  * We must use chunked encoding to send it.
 545                  */
 546                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 547                 rpc->initial_buffer = 1;
 548                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 549                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 550 #ifndef NO_CURL_IOCTL
 551                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 552                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 553 #endif
 554                 if (options.verbosity > 1) {
 555                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 556                         fflush(stderr);
 557                 }
 558
 559         } else if (gzip_body) {
 560                 /*
 561                  * If we are looping to retry authentication, then the previous
 562                  * run will have set up the headers and gzip buffer already,
 563                  * and we just need to send it.
 564                  */
 565                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 566                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 567
 568         } else if (use_gzip && 1024 < rpc->len) {
 569                 /* The client backend isn't giving us compressed data so
 570                  * we can try to deflate it ourselves, this may save on.
 571                  * the transfer time.
 572                  */
 573                 git_zstream stream;
 574                 int ret;
 575
 576                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 577                 gzip_size = git_deflate_bound(&stream, rpc->len);
 578                 gzip_body = xmalloc(gzip_size);
 579
 580                 stream.next_in = (unsigned char *)rpc->buf;
 581                 stream.avail_in = rpc->len;
 582                 stream.next_out = (unsigned char *)gzip_body;
 583                 stream.avail_out = gzip_size;
 584
 585                 ret = git_deflate(&stream, Z_FINISH);
 586                 if (ret != Z_STREAM_END)
 587                         die("cannot deflate request; zlib deflate error %d", ret);
 588
 589                 ret = git_deflate_end_gently(&stream);
 590                 if (ret != Z_OK)
 591                         die("cannot deflate request; zlib end error %d", ret);
 592
 593                 gzip_size = stream.total_out;
 594
 595                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 596                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 597                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 598
 599                 if (options.verbosity > 1) {
 600                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 601                                 rpc->service_name,
 602                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
 603                         fflush(stderr);
 604                 }
 605         } else {
 606                 /* We know the complete request size in advance, use the
 607                  * more normal Content-Length approach.
 608                  */
 609                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 610                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 611                 if (options.verbosity > 1) {
 612                         fprintf(stderr, "POST %s (%lu bytes)\n",
 613                                 rpc->service_name, (unsigned long)rpc->len);
 614                         fflush(stderr);
 615                 }
 616         }
 617
 618         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 619         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 620         curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 621
 622         err = run_slot(slot, NULL);
 623         if (err == HTTP_REAUTH && !large_request) {
 624                 credential_fill(&http_auth);
 625                 goto retry;
 626         }
 627         if (err != HTTP_OK)
 628                 err = -1;
 629
 630         curl_slist_free_all(headers);
 631         free(gzip_body);
 632         return err;
 633 }
 634
 635 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 636 {
 637         const char *svc = rpc->service_name;
 638         struct strbuf buf = STRBUF_INIT;
 639         struct strbuf *preamble = rpc->stdin_preamble;
 640         struct child_process client = CHILD_PROCESS_INIT;
 641         int err = 0;
 642
 643         client.in = -1;
 644         client.out = -1;
 645         client.git_cmd = 1;
 646         client.argv = rpc->argv;
 647         if (start_command(&client))
 648                 exit(1);
 649         if (preamble)
 650                 write_or_die(client.in, preamble->buf, preamble->len);
 651         if (heads)
 652                 write_or_die(client.in, heads->buf, heads->len);
 653
 654         rpc->alloc = http_post_buffer;
 655         rpc->buf = xmalloc(rpc->alloc);
 656         rpc->in = client.in;
 657         rpc->out = client.out;
 658         strbuf_init(&rpc->result, 0);
 659
 660         strbuf_addf(&buf, "%s%s", url.buf, svc);
 661         rpc->service_url = strbuf_detach(&buf, NULL);
 662
 663         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 664         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 665
 666         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 667         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 668
 669         while (!err) {
 670                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 671                 if (!n)
 672                         break;
 673                 rpc->pos = 0;
 674                 rpc->len = n;
 675                 err |= post_rpc(rpc);
 676         }
 677
 678         close(client.in);
 679         client.in = -1;
 680         if (!err) {
 681                 strbuf_read(&rpc->result, client.out, 0);
 682         } else {
 683                 char buf[4096];
 684                 for (;;)
 685                         if (xread(client.out, buf, sizeof(buf)) <= 0)
 686                                 break;
 687         }
 688
 689         close(client.out);
 690         client.out = -1;
 691
 692         err |= finish_command(&client);
 693         free(rpc->service_url);
 694         free(rpc->hdr_content_type);
 695         free(rpc->hdr_accept);
 696         free(rpc->buf);
 697         strbuf_release(&buf);
 698         return err;
 699 }
 700
 701 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 702 {
 703         struct walker *walker;
 704         char **targets = xmalloc(nr_heads * sizeof(char*));
 705         int ret, i;
 706
 707         if (options.depth || options.deepen_since)
 708                 die("dumb http transport does not support shallow capabilities");
 709         for (i = 0; i < nr_heads; i++)
 710                 targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
 711
 712         walker = get_http_walker(url.buf);
 713         walker->get_all = 1;
 714         walker->get_tree = 1;
 715         walker->get_history = 1;
 716         walker->get_verbosely = options.verbosity >= 3;
 717         walker->get_recover = 0;
 718         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 719         walker_free(walker);
 720
 721         for (i = 0; i < nr_heads; i++)
 722                 free(targets[i]);
 723         free(targets);
 724
 725         return ret ? error("fetch failed.") : 0;
 726 }
 727
 728 static int fetch_git(struct discovery *heads,
 729         int nr_heads, struct ref **to_fetch)
 730 {
 731         struct rpc_state rpc;
 732         struct strbuf preamble = STRBUF_INIT;
 733         int i, err;
 734         struct argv_array args = ARGV_ARRAY_INIT;
 735
 736         argv_array_pushl(&args, "fetch-pack", "--stateless-rpc",
 737                          "--stdin", "--lock-pack", NULL);
 738         if (options.followtags)
 739                 argv_array_push(&args, "--include-tag");
 740         if (options.thin)
 741                 argv_array_push(&args, "--thin");
 742         if (options.verbosity >= 3)
 743                 argv_array_pushl(&args, "-v", "-v", NULL);
 744         if (options.check_self_contained_and_connected)
 745                 argv_array_push(&args, "--check-self-contained-and-connected");
 746         if (options.cloning)
 747                 argv_array_push(&args, "--cloning");
 748         if (options.update_shallow)
 749                 argv_array_push(&args, "--update-shallow");
 750         if (!options.progress)
 751                 argv_array_push(&args, "--no-progress");
 752         if (options.depth)
 753                 argv_array_pushf(&args, "--depth=%lu", options.depth);
 754         if (options.deepen_since)
 755                 argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since);
 756         argv_array_push(&args, url.buf);
 757
 758         for (i = 0; i < nr_heads; i++) {
 759                 struct ref *ref = to_fetch[i];
 760                 if (!*ref->name)
 761                         die("cannot fetch by sha1 over smart http");
 762                 packet_buf_write(&preamble, "%s %s\n",
 763                                  oid_to_hex(&ref->old_oid), ref->name);
 764         }
 765         packet_buf_flush(&preamble);
 766
 767         memset(&rpc, 0, sizeof(rpc));
 768         rpc.service_name = "git-upload-pack",
 769         rpc.argv = args.argv;
 770         rpc.stdin_preamble = &preamble;
 771         rpc.gzip_request = 1;
 772
 773         err = rpc_service(&rpc, heads);
 774         if (rpc.result.len)
 775                 write_or_die(1, rpc.result.buf, rpc.result.len);
 776         strbuf_release(&rpc.result);
 777         strbuf_release(&preamble);
 778         argv_array_clear(&args);
 779         return err;
 780 }
 781
 782 static int fetch(int nr_heads, struct ref **to_fetch)
 783 {
 784         struct discovery *d = discover_refs("git-upload-pack", 0);
 785         if (d->proto_git)
 786                 return fetch_git(d, nr_heads, to_fetch);
 787         else
 788                 return fetch_dumb(nr_heads, to_fetch);
 789 }
 790
 791 static void parse_fetch(struct strbuf *buf)
 792 {
 793         struct ref **to_fetch = NULL;
 794         struct ref *list_head = NULL;
 795         struct ref **list = &list_head;
 796         int alloc_heads = 0, nr_heads = 0;
 797
 798         do {
 799                 const char *p;
 800                 if (skip_prefix(buf->buf, "fetch ", &p)) {
 801                         const char *name;
 802                         struct ref *ref;
 803                         struct object_id old_oid;
 804
 805                         if (get_oid_hex(p, &old_oid))
 806                                 die("protocol error: expected sha/ref, got %s'", p);
 807                         if (p[GIT_SHA1_HEXSZ] == ' ')
 808                                 name = p + GIT_SHA1_HEXSZ + 1;
 809                         else if (!p[GIT_SHA1_HEXSZ])
 810                                 name = "";
 811                         else
 812                                 die("protocol error: expected sha/ref, got %s'", p);
 813
 814                         ref = alloc_ref(name);
 815                         oidcpy(&ref->old_oid, &old_oid);
 816
 817                         *list = ref;
 818                         list = &ref->next;
 819
 820                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 821                         to_fetch[nr_heads++] = ref;
 822                 }
 823                 else
 824                         die("http transport does not support %s", buf->buf);
 825
 826                 strbuf_reset(buf);
 827                 if (strbuf_getline_lf(buf, stdin) == EOF)
 828                         return;
 829                 if (!*buf->buf)
 830                         break;
 831         } while (1);
 832
 833         if (fetch(nr_heads, to_fetch))
 834                 exit(128); /* error already reported */
 835         free_refs(list_head);
 836         free(to_fetch);
 837
 838         printf("\n");
 839         fflush(stdout);
 840         strbuf_reset(buf);
 841 }
 842
 843 static int push_dav(int nr_spec, char **specs)
 844 {
 845         const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 846         int argc = 0, i;
 847
 848         argv[argc++] = "http-push";
 849         argv[argc++] = "--helper-status";
 850         if (options.dry_run)
 851                 argv[argc++] = "--dry-run";
 852         if (options.verbosity > 1)
 853                 argv[argc++] = "--verbose";
 854         argv[argc++] = url.buf;
 855         for (i = 0; i < nr_spec; i++)
 856                 argv[argc++] = specs[i];
 857         argv[argc++] = NULL;
 858
 859         if (run_command_v_opt(argv, RUN_GIT_CMD))
 860                 die("git-%s failed", argv[0]);
 861         free(argv);
 862         return 0;
 863 }
 864
 865 static int push_git(struct discovery *heads, int nr_spec, char **specs)
 866 {
 867         struct rpc_state rpc;
 868         int i, err;
 869         struct argv_array args;
 870         struct string_list_item *cas_option;
 871         struct strbuf preamble = STRBUF_INIT;
 872
 873         argv_array_init(&args);
 874         argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 875                          NULL);
 876
 877         if (options.thin)
 878                 argv_array_push(&args, "--thin");
 879         if (options.dry_run)
 880                 argv_array_push(&args, "--dry-run");
 881         if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
 882                 argv_array_push(&args, "--signed=yes");
 883         else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
 884                 argv_array_push(&args, "--signed=if-asked");
 885         if (options.verbosity == 0)
 886                 argv_array_push(&args, "--quiet");
 887         else if (options.verbosity > 1)
 888                 argv_array_push(&args, "--verbose");
 889         argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 890         for_each_string_list_item(cas_option, &cas_options)
 891                 argv_array_push(&args, cas_option->string);
 892         argv_array_push(&args, url.buf);
 893
 894         argv_array_push(&args, "--stdin");
 895         for (i = 0; i < nr_spec; i++)
 896                 packet_buf_write(&preamble, "%s\n", specs[i]);
 897         packet_buf_flush(&preamble);
 898
 899         memset(&rpc, 0, sizeof(rpc));
 900         rpc.service_name = "git-receive-pack",
 901         rpc.argv = args.argv;
 902         rpc.stdin_preamble = &preamble;
 903
 904         err = rpc_service(&rpc, heads);
 905         if (rpc.result.len)
 906                 write_or_die(1, rpc.result.buf, rpc.result.len);
 907         strbuf_release(&rpc.result);
 908         strbuf_release(&preamble);
 909         argv_array_clear(&args);
 910         return err;
 911 }
 912
 913 static int push(int nr_spec, char **specs)
 914 {
 915         struct discovery *heads = discover_refs("git-receive-pack", 1);
 916         int ret;
 917
 918         if (heads->proto_git)
 919                 ret = push_git(heads, nr_spec, specs);
 920         else
 921                 ret = push_dav(nr_spec, specs);
 922         free_discovery(heads);
 923         return ret;
 924 }
 925
 926 static void parse_push(struct strbuf *buf)
 927 {
 928         char **specs = NULL;
 929         int alloc_spec = 0, nr_spec = 0, i, ret;
 930
 931         do {
 932                 if (starts_with(buf->buf, "push ")) {
 933                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 934                         specs[nr_spec++] = xstrdup(buf->buf + 5);
 935                 }
 936                 else
 937                         die("http transport does not support %s", buf->buf);
 938
 939                 strbuf_reset(buf);
 940                 if (strbuf_getline_lf(buf, stdin) == EOF)
 941                         goto free_specs;
 942                 if (!*buf->buf)
 943                         break;
 944         } while (1);
 945
 946         ret = push(nr_spec, specs);
 947         printf("\n");
 948         fflush(stdout);
 949
 950         if (ret)
 951                 exit(128); /* error already reported */
 952
 953  free_specs:
 954         for (i = 0; i < nr_spec; i++)
 955                 free(specs[i]);
 956         free(specs);
 957 }
 958
 959 int main(int argc, const char **argv)
 960 {
 961         struct strbuf buf = STRBUF_INIT;
 962         int nongit;
 963
 964         git_setup_gettext();
 965
 966         git_extract_argv0_path(argv[0]);
 967         setup_git_directory_gently(&nongit);
 968         if (argc < 2) {
 969                 error("remote-curl: usage: git remote-curl <remote> [<url>]");
 970                 return 1;
 971         }
 972
 973         options.verbosity = 1;
 974         options.progress = !!isatty(2);
 975         options.thin = 1;
 976
 977         remote = remote_get(argv[1]);
 978
 979         if (argc > 2) {
 980                 end_url_with_slash(&url, argv[2]);
 981         } else {
 982                 end_url_with_slash(&url, remote->url[0]);
 983         }
 984
 985         http_init(remote, url.buf, 0);
 986
 987         do {
 988                 const char *arg;
 989
 990                 if (strbuf_getline_lf(&buf, stdin) == EOF) {
 991                         if (ferror(stdin))
 992                                 error("remote-curl: error reading command stream from git");
 993                         return 1;
 994                 }
 995                 if (buf.len == 0)
 996                         break;
 997                 if (starts_with(buf.buf, "fetch ")) {
 998                         if (nongit)
 999                                 die("remote-curl: fetch attempted without a local repo");
1000                         parse_fetch(&buf);
1001
1002                 } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1003                         int for_push = !!strstr(buf.buf + 4, "for-push");
1004                         output_refs(get_refs(for_push));
1005
1006                 } else if (starts_with(buf.buf, "push ")) {
1007                         parse_push(&buf);
1008
1009                 } else if (skip_prefix(buf.buf, "option ", &arg)) {
1010                         char *value = strchr(arg, ' ');
1011                         int result;
1012
1013                         if (value)
1014                                 *value++ = '\0';
1015                         else
1016                                 value = "true";
1017
1018                         result = set_option(arg, value);
1019                         if (!result)
1020                                 printf("ok\n");
1021                         else if (result < 0)
1022                                 printf("error invalid value\n");
1023                         else
1024                                 printf("unsupported\n");
1025                         fflush(stdout);
1026
1027                 } else if (!strcmp(buf.buf, "capabilities")) {
1028                         printf("fetch\n");
1029                         printf("option\n");
1030                         printf("push\n");
1031                         printf("check-connectivity\n");
1032                         printf("\n");
1033                         fflush(stdout);
1034                 } else {
1035                         error("remote-curl: unknown command '%s' from git", buf.buf);
1036                         return 1;
1037                 }
1038                 strbuf_reset(&buf);
1039         } while (1);
1040
1041         http_cleanup();
1042
1043         return 0;
1044 }