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         unsigned progress : 1,
  24                 check_self_contained_and_connected : 1,
  25                 cloning : 1,
  26                 update_shallow : 1,
  27                 followtags : 1,
  28                 dry_run : 1,
  29                 thin : 1,
  30                 /* One of the SEND_PACK_PUSH_CERT_* constants. */
  31                 push_cert : 2;
  32 };
  33 static struct options options;
  34 static struct string_list cas_options = STRING_LIST_INIT_DUP;
  35
  36 static int set_option(const char *name, const char *value)
  37 {
  38         if (!strcmp(name, "verbosity")) {
  39                 char *end;
  40                 int v = strtol(value, &end, 10);
  41                 if (value == end || *end)
  42                         return -1;
  43                 options.verbosity = v;
  44                 return 0;
  45         }
  46         else if (!strcmp(name, "progress")) {
  47                 if (!strcmp(value, "true"))
  48                         options.progress = 1;
  49                 else if (!strcmp(value, "false"))
  50                         options.progress = 0;
  51                 else
  52                         return -1;
  53                 return 0;
  54         }
  55         else if (!strcmp(name, "depth")) {
  56                 char *end;
  57                 unsigned long v = strtoul(value, &end, 10);
  58                 if (value == end || *end)
  59                         return -1;
  60                 options.depth = v;
  61                 return 0;
  62         }
  63         else if (!strcmp(name, "followtags")) {
  64                 if (!strcmp(value, "true"))
  65                         options.followtags = 1;
  66                 else if (!strcmp(value, "false"))
  67                         options.followtags = 0;
  68                 else
  69                         return -1;
  70                 return 0;
  71         }
  72         else if (!strcmp(name, "dry-run")) {
  73                 if (!strcmp(value, "true"))
  74                         options.dry_run = 1;
  75                 else if (!strcmp(value, "false"))
  76                         options.dry_run = 0;
  77                 else
  78                         return -1;
  79                 return 0;
  80         }
  81         else if (!strcmp(name, "check-connectivity")) {
  82                 if (!strcmp(value, "true"))
  83                         options.check_self_contained_and_connected = 1;
  84                 else if (!strcmp(value, "false"))
  85                         options.check_self_contained_and_connected = 0;
  86                 else
  87                         return -1;
  88                 return 0;
  89         }
  90         else if (!strcmp(name, "cas")) {
  91                 struct strbuf val = STRBUF_INIT;
  92                 strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
  93                 string_list_append(&cas_options, val.buf);
  94                 strbuf_release(&val);
  95                 return 0;
  96         } else if (!strcmp(name, "cloning")) {
  97                 if (!strcmp(value, "true"))
  98                         options.cloning = 1;
  99                 else if (!strcmp(value, "false"))
 100                         options.cloning = 0;
 101                 else
 102                         return -1;
 103                 return 0;
 104         } else if (!strcmp(name, "update-shallow")) {
 105                 if (!strcmp(value, "true"))
 106                         options.update_shallow = 1;
 107                 else if (!strcmp(value, "false"))
 108                         options.update_shallow = 0;
 109                 else
 110                         return -1;
 111                 return 0;
 112         } else if (!strcmp(name, "pushcert")) {
 113                 if (!strcmp(value, "true"))
 114                         options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 115                 else if (!strcmp(value, "false"))
 116                         options.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 117                 else if (!strcmp(value, "if-asked"))
 118                         options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 119                 else
 120                         return -1;
 121                 return 0;
 122
 123 #if LIBCURL_VERSION_NUM >= 0x070a08
 124         } else if (!strcmp(name, "family")) {
 125                 if (!strcmp(value, "ipv4"))
 126                         git_curl_ipresolve = CURL_IPRESOLVE_V4;
 127                 else if (!strcmp(value, "ipv6"))
 128                         git_curl_ipresolve = CURL_IPRESOLVE_V6;
 129                 else if (!strcmp(value, "all"))
 130                         git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
 131                 else
 132                         return -1;
 133                 return 0;
 134 #endif /* LIBCURL_VERSION_NUM >= 0x070a08 */
 135         } else {
 136                 return 1 /* unsupported */;
 137         }
 138 }
 139
 140 struct discovery {
 141         const char *service;
 142         char *buf_alloc;
 143         char *buf;
 144         size_t len;
 145         struct ref *refs;
 146         struct sha1_array shallow;
 147         unsigned proto_git : 1;
 148 };
 149 static struct discovery *last_discovery;
 150
 151 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 152 {
 153         struct ref *list = NULL;
 154         get_remote_heads(-1, heads->buf, heads->len, &list,
 155                          for_push ? REF_NORMAL : 0, NULL, &heads->shallow);
 156         return list;
 157 }
 158
 159 static struct ref *parse_info_refs(struct discovery *heads)
 160 {
 161         char *data, *start, *mid;
 162         char *ref_name;
 163         int i = 0;
 164
 165         struct ref *refs = NULL;
 166         struct ref *ref = NULL;
 167         struct ref *last_ref = NULL;
 168
 169         data = heads->buf;
 170         start = NULL;
 171         mid = data;
 172         while (i < heads->len) {
 173                 if (!start) {
 174                         start = &data[i];
 175                 }
 176                 if (data[i] == '\t')
 177                         mid = &data[i];
 178                 if (data[i] == '\n') {
 179                         if (mid - start != 40)
 180                                 die("%sinfo/refs not valid: is this a git repository?",
 181                                     url.buf);
 182                         data[i] = 0;
 183                         ref_name = mid + 1;
 184                         ref = alloc_ref(ref_name);
 185                         get_oid_hex(start, &ref->old_oid);
 186                         if (!refs)
 187                                 refs = ref;
 188                         if (last_ref)
 189                                 last_ref->next = ref;
 190                         last_ref = ref;
 191                         start = NULL;
 192                 }
 193                 i++;
 194         }
 195
 196         ref = alloc_ref("HEAD");
 197         if (!http_fetch_ref(url.buf, ref) &&
 198             !resolve_remote_symref(ref, refs)) {
 199                 ref->next = refs;
 200                 refs = ref;
 201         } else {
 202                 free(ref);
 203         }
 204
 205         return refs;
 206 }
 207
 208 static void free_discovery(struct discovery *d)
 209 {
 210         if (d) {
 211                 if (d == last_discovery)
 212                         last_discovery = NULL;
 213                 free(d->shallow.sha1);
 214                 free(d->buf_alloc);
 215                 free_refs(d->refs);
 216                 free(d);
 217         }
 218 }
 219
 220 static int show_http_message(struct strbuf *type, struct strbuf *charset,
 221                              struct strbuf *msg)
 222 {
 223         const char *p, *eol;
 224
 225         /*
 226          * We only show text/plain parts, as other types are likely
 227          * to be ugly to look at on the user's terminal.
 228          */
 229         if (strcmp(type->buf, "text/plain"))
 230                 return -1;
 231         if (charset->len)
 232                 strbuf_reencode(msg, charset->buf, get_log_output_encoding());
 233
 234         strbuf_trim(msg);
 235         if (!msg->len)
 236                 return -1;
 237
 238         p = msg->buf;
 239         do {
 240                 eol = strchrnul(p, '\n');
 241                 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 242                 p = eol + 1;
 243         } while(*eol);
 244         return 0;
 245 }
 246
 247 static struct discovery *discover_refs(const char *service, int for_push)
 248 {
 249         struct strbuf exp = STRBUF_INIT;
 250         struct strbuf type = STRBUF_INIT;
 251         struct strbuf charset = STRBUF_INIT;
 252         struct strbuf buffer = STRBUF_INIT;
 253         struct strbuf refs_url = STRBUF_INIT;
 254         struct strbuf effective_url = STRBUF_INIT;
 255         struct discovery *last = last_discovery;
 256         int http_ret, maybe_smart = 0;
 257         struct http_get_options options;
 258
 259         if (last && !strcmp(service, last->service))
 260                 return last;
 261         free_discovery(last);
 262
 263         strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 264         if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 265              git_env_bool("GIT_SMART_HTTP", 1)) {
 266                 maybe_smart = 1;
 267                 if (!strchr(url.buf, '?'))
 268                         strbuf_addch(&refs_url, '?');
 269                 else
 270                         strbuf_addch(&refs_url, '&');
 271                 strbuf_addf(&refs_url, "service=%s", service);
 272         }
 273
 274         memset(&options, 0, sizeof(options));
 275         options.content_type = &type;
 276         options.charset = &charset;
 277         options.effective_url = &effective_url;
 278         options.base_url = &url;
 279         options.no_cache = 1;
 280         options.keep_error = 1;
 281
 282         http_ret = http_get_strbuf(refs_url.buf, &buffer, &options);
 283         switch (http_ret) {
 284         case HTTP_OK:
 285                 break;
 286         case HTTP_MISSING_TARGET:
 287                 show_http_message(&type, &charset, &buffer);
 288                 die("repository '%s' not found", url.buf);
 289         case HTTP_NOAUTH:
 290                 show_http_message(&type, &charset, &buffer);
 291                 die("Authentication failed for '%s'", url.buf);
 292         default:
 293                 show_http_message(&type, &charset, &buffer);
 294                 die("unable to access '%s': %s", url.buf, curl_errorstr);
 295         }
 296
 297         last= xcalloc(1, sizeof(*last_discovery));
 298         last->service = service;
 299         last->buf_alloc = strbuf_detach(&buffer, &last->len);
 300         last->buf = last->buf_alloc;
 301
 302         strbuf_addf(&exp, "application/x-%s-advertisement", service);
 303         if (maybe_smart &&
 304             (5 <= last->len && last->buf[4] == '#') &&
 305             !strbuf_cmp(&exp, &type)) {
 306                 char *line;
 307
 308                 /*
 309                  * smart HTTP response; validate that the service
 310                  * pkt-line matches our request.
 311                  */
 312                 line = packet_read_line_buf(&last->buf, &last->len, NULL);
 313
 314                 strbuf_reset(&exp);
 315                 strbuf_addf(&exp, "# service=%s", service);
 316                 if (strcmp(line, exp.buf))
 317                         die("invalid server response; got '%s'", line);
 318                 strbuf_release(&exp);
 319
 320                 /* The header can include additional metadata lines, up
 321                  * until a packet flush marker.  Ignore these now, but
 322                  * in the future we might start to scan them.
 323                  */
 324                 while (packet_read_line_buf(&last->buf, &last->len, NULL))
 325                         ;
 326
 327                 last->proto_git = 1;
 328         }
 329
 330         if (last->proto_git)
 331                 last->refs = parse_git_refs(last, for_push);
 332         else
 333                 last->refs = parse_info_refs(last);
 334
 335         strbuf_release(&refs_url);
 336         strbuf_release(&exp);
 337         strbuf_release(&type);
 338         strbuf_release(&charset);
 339         strbuf_release(&effective_url);
 340         strbuf_release(&buffer);
 341         last_discovery = last;
 342         return last;
 343 }
 344
 345 static struct ref *get_refs(int for_push)
 346 {
 347         struct discovery *heads;
 348
 349         if (for_push)
 350                 heads = discover_refs("git-receive-pack", for_push);
 351         else
 352                 heads = discover_refs("git-upload-pack", for_push);
 353
 354         return heads->refs;
 355 }
 356
 357 static void output_refs(struct ref *refs)
 358 {
 359         struct ref *posn;
 360         for (posn = refs; posn; posn = posn->next) {
 361                 if (posn->symref)
 362                         printf("@%s %s\n", posn->symref, posn->name);
 363                 else
 364                         printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name);
 365         }
 366         printf("\n");
 367         fflush(stdout);
 368 }
 369
 370 struct rpc_state {
 371         const char *service_name;
 372         const char **argv;
 373         struct strbuf *stdin_preamble;
 374         char *service_url;
 375         char *hdr_content_type;
 376         char *hdr_accept;
 377         char *buf;
 378         size_t alloc;
 379         size_t len;
 380         size_t pos;
 381         int in;
 382         int out;
 383         struct strbuf result;
 384         unsigned gzip_request : 1;
 385         unsigned initial_buffer : 1;
 386 };
 387
 388 static size_t rpc_out(void *ptr, size_t eltsize,
 389                 size_t nmemb, void *buffer_)
 390 {
 391         size_t max = eltsize * nmemb;
 392         struct rpc_state *rpc = buffer_;
 393         size_t avail = rpc->len - rpc->pos;
 394
 395         if (!avail) {
 396                 rpc->initial_buffer = 0;
 397                 avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 398                 if (!avail)
 399                         return 0;
 400                 rpc->pos = 0;
 401                 rpc->len = avail;
 402         }
 403
 404         if (max < avail)
 405                 avail = max;
 406         memcpy(ptr, rpc->buf + rpc->pos, avail);
 407         rpc->pos += avail;
 408         return avail;
 409 }
 410
 411 #ifndef NO_CURL_IOCTL
 412 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 413 {
 414         struct rpc_state *rpc = clientp;
 415
 416         switch (cmd) {
 417         case CURLIOCMD_NOP:
 418                 return CURLIOE_OK;
 419
 420         case CURLIOCMD_RESTARTREAD:
 421                 if (rpc->initial_buffer) {
 422                         rpc->pos = 0;
 423                         return CURLIOE_OK;
 424                 }
 425                 error("unable to rewind rpc post data - try increasing http.postBuffer");
 426                 return CURLIOE_FAILRESTART;
 427
 428         default:
 429                 return CURLIOE_UNKNOWNCMD;
 430         }
 431 }
 432 #endif
 433
 434 static size_t rpc_in(char *ptr, size_t eltsize,
 435                 size_t nmemb, void *buffer_)
 436 {
 437         size_t size = eltsize * nmemb;
 438         struct rpc_state *rpc = buffer_;
 439         write_or_die(rpc->in, ptr, size);
 440         return size;
 441 }
 442
 443 static int run_slot(struct active_request_slot *slot,
 444                     struct slot_results *results)
 445 {
 446         int err;
 447         struct slot_results results_buf;
 448
 449         if (!results)
 450                 results = &results_buf;
 451
 452         err = run_one_slot(slot, results);
 453
 454         if (err != HTTP_OK && err != HTTP_REAUTH) {
 455                 struct strbuf msg = STRBUF_INIT;
 456                 if (results->http_code && results->http_code != 200)
 457                         strbuf_addf(&msg, "HTTP %ld", results->http_code);
 458                 if (results->curl_result != CURLE_OK) {
 459                         if (msg.len)
 460                                 strbuf_addch(&msg, ' ');
 461                         strbuf_addf(&msg, "curl %d", results->curl_result);
 462                         if (curl_errorstr[0]) {
 463                                 strbuf_addch(&msg, ' ');
 464                                 strbuf_addstr(&msg, curl_errorstr);
 465                         }
 466                 }
 467                 error("RPC failed; %s", msg.buf);
 468                 strbuf_release(&msg);
 469         }
 470
 471         return err;
 472 }
 473
 474 static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 475 {
 476         struct active_request_slot *slot;
 477         struct curl_slist *headers = NULL;
 478         struct strbuf buf = STRBUF_INIT;
 479         int err;
 480
 481         slot = get_active_slot();
 482
 483         headers = curl_slist_append(headers, rpc->hdr_content_type);
 484         headers = curl_slist_append(headers, rpc->hdr_accept);
 485
 486         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 487         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 488         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 489         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 490         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 491         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 492         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 493         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 494         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 495
 496         err = run_slot(slot, results);
 497
 498         curl_slist_free_all(headers);
 499         strbuf_release(&buf);
 500         return err;
 501 }
 502
 503 static int post_rpc(struct rpc_state *rpc)
 504 {
 505         struct active_request_slot *slot;
 506         struct curl_slist *headers = NULL;
 507         int use_gzip = rpc->gzip_request;
 508         char *gzip_body = NULL;
 509         size_t gzip_size = 0;
 510         int err, large_request = 0;
 511         int needs_100_continue = 0;
 512
 513         /* Try to load the entire request, if we can fit it into the
 514          * allocated buffer space we can use HTTP/1.0 and avoid the
 515          * chunked encoding mess.
 516          */
 517         while (1) {
 518                 size_t left = rpc->alloc - rpc->len;
 519                 char *buf = rpc->buf + rpc->len;
 520                 int n;
 521
 522                 if (left < LARGE_PACKET_MAX) {
 523                         large_request = 1;
 524                         use_gzip = 0;
 525                         break;
 526                 }
 527
 528                 n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 529                 if (!n)
 530                         break;
 531                 rpc->len += n;
 532         }
 533
 534         if (large_request) {
 535                 struct slot_results results;
 536
 537                 do {
 538                         err = probe_rpc(rpc, &results);
 539                         if (err == HTTP_REAUTH)
 540                                 credential_fill(&http_auth);
 541                 } while (err == HTTP_REAUTH);
 542                 if (err != HTTP_OK)
 543                         return -1;
 544
 545                 if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 546                         needs_100_continue = 1;
 547         }
 548
 549         headers = curl_slist_append(headers, rpc->hdr_content_type);
 550         headers = curl_slist_append(headers, rpc->hdr_accept);
 551         headers = curl_slist_append(headers, needs_100_continue ?
 552                 "Expect: 100-continue" : "Expect:");
 553
 554 retry:
 555         slot = get_active_slot();
 556
 557         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 558         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 559         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 560         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 561
 562         if (large_request) {
 563                 /* The request body is large and the size cannot be predicted.
 564                  * We must use chunked encoding to send it.
 565                  */
 566                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 567                 rpc->initial_buffer = 1;
 568                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 569                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 570 #ifndef NO_CURL_IOCTL
 571                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 572                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 573 #endif
 574                 if (options.verbosity > 1) {
 575                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 576                         fflush(stderr);
 577                 }
 578
 579         } else if (gzip_body) {
 580                 /*
 581                  * If we are looping to retry authentication, then the previous
 582                  * run will have set up the headers and gzip buffer already,
 583                  * and we just need to send it.
 584                  */
 585                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 586                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 587
 588         } else if (use_gzip && 1024 < rpc->len) {
 589                 /* The client backend isn't giving us compressed data so
 590                  * we can try to deflate it ourselves, this may save on.
 591                  * the transfer time.
 592                  */
 593                 git_zstream stream;
 594                 int ret;
 595
 596                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 597                 gzip_size = git_deflate_bound(&stream, rpc->len);
 598                 gzip_body = xmalloc(gzip_size);
 599
 600                 stream.next_in = (unsigned char *)rpc->buf;
 601                 stream.avail_in = rpc->len;
 602                 stream.next_out = (unsigned char *)gzip_body;
 603                 stream.avail_out = gzip_size;
 604
 605                 ret = git_deflate(&stream, Z_FINISH);
 606                 if (ret != Z_STREAM_END)
 607                         die("cannot deflate request; zlib deflate error %d", ret);
 608
 609                 ret = git_deflate_end_gently(&stream);
 610                 if (ret != Z_OK)
 611                         die("cannot deflate request; zlib end error %d", ret);
 612
 613                 gzip_size = stream.total_out;
 614
 615                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 616                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 617                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 618
 619                 if (options.verbosity > 1) {
 620                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 621                                 rpc->service_name,
 622                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
 623                         fflush(stderr);
 624                 }
 625         } else {
 626                 /* We know the complete request size in advance, use the
 627                  * more normal Content-Length approach.
 628                  */
 629                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 630                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 631                 if (options.verbosity > 1) {
 632                         fprintf(stderr, "POST %s (%lu bytes)\n",
 633                                 rpc->service_name, (unsigned long)rpc->len);
 634                         fflush(stderr);
 635                 }
 636         }
 637
 638         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 639         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 640         curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 641
 642         err = run_slot(slot, NULL);
 643         if (err == HTTP_REAUTH && !large_request) {
 644                 credential_fill(&http_auth);
 645                 goto retry;
 646         }
 647         if (err != HTTP_OK)
 648                 err = -1;
 649
 650         curl_slist_free_all(headers);
 651         free(gzip_body);
 652         return err;
 653 }
 654
 655 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 656 {
 657         const char *svc = rpc->service_name;
 658         struct strbuf buf = STRBUF_INIT;
 659         struct strbuf *preamble = rpc->stdin_preamble;
 660         struct child_process client = CHILD_PROCESS_INIT;
 661         int err = 0;
 662
 663         client.in = -1;
 664         client.out = -1;
 665         client.git_cmd = 1;
 666         client.argv = rpc->argv;
 667         if (start_command(&client))
 668                 exit(1);
 669         if (preamble)
 670                 write_or_die(client.in, preamble->buf, preamble->len);
 671         if (heads)
 672                 write_or_die(client.in, heads->buf, heads->len);
 673
 674         rpc->alloc = http_post_buffer;
 675         rpc->buf = xmalloc(rpc->alloc);
 676         rpc->in = client.in;
 677         rpc->out = client.out;
 678         strbuf_init(&rpc->result, 0);
 679
 680         strbuf_addf(&buf, "%s%s", url.buf, svc);
 681         rpc->service_url = strbuf_detach(&buf, NULL);
 682
 683         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 684         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 685
 686         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 687         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 688
 689         while (!err) {
 690                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 691                 if (!n)
 692                         break;
 693                 rpc->pos = 0;
 694                 rpc->len = n;
 695                 err |= post_rpc(rpc);
 696         }
 697
 698         close(client.in);
 699         client.in = -1;
 700         if (!err) {
 701                 strbuf_read(&rpc->result, client.out, 0);
 702         } else {
 703                 char buf[4096];
 704                 for (;;)
 705                         if (xread(client.out, buf, sizeof(buf)) <= 0)
 706                                 break;
 707         }
 708
 709         close(client.out);
 710         client.out = -1;
 711
 712         err |= finish_command(&client);
 713         free(rpc->service_url);
 714         free(rpc->hdr_content_type);
 715         free(rpc->hdr_accept);
 716         free(rpc->buf);
 717         strbuf_release(&buf);
 718         return err;
 719 }
 720
 721 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 722 {
 723         struct walker *walker;
 724         char **targets;
 725         int ret, i;
 726
 727         ALLOC_ARRAY(targets, nr_heads);
 728         if (options.depth)
 729                 die("dumb http transport does not support --depth");
 730         for (i = 0; i < nr_heads; i++)
 731                 targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
 732
 733         walker = get_http_walker(url.buf);
 734         walker->get_all = 1;
 735         walker->get_tree = 1;
 736         walker->get_history = 1;
 737         walker->get_verbosely = options.verbosity >= 3;
 738         walker->get_recover = 0;
 739         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 740         walker_free(walker);
 741
 742         for (i = 0; i < nr_heads; i++)
 743                 free(targets[i]);
 744         free(targets);
 745
 746         return ret ? error("fetch failed.") : 0;
 747 }
 748
 749 static int fetch_git(struct discovery *heads,
 750         int nr_heads, struct ref **to_fetch)
 751 {
 752         struct rpc_state rpc;
 753         struct strbuf preamble = STRBUF_INIT;
 754         char *depth_arg = NULL;
 755         int argc = 0, i, err;
 756         const char *argv[17];
 757
 758         argv[argc++] = "fetch-pack";
 759         argv[argc++] = "--stateless-rpc";
 760         argv[argc++] = "--stdin";
 761         argv[argc++] = "--lock-pack";
 762         if (options.followtags)
 763                 argv[argc++] = "--include-tag";
 764         if (options.thin)
 765                 argv[argc++] = "--thin";
 766         if (options.verbosity >= 3) {
 767                 argv[argc++] = "-v";
 768                 argv[argc++] = "-v";
 769         }
 770         if (options.check_self_contained_and_connected)
 771                 argv[argc++] = "--check-self-contained-and-connected";
 772         if (options.cloning)
 773                 argv[argc++] = "--cloning";
 774         if (options.update_shallow)
 775                 argv[argc++] = "--update-shallow";
 776         if (!options.progress)
 777                 argv[argc++] = "--no-progress";
 778         if (options.depth) {
 779                 struct strbuf buf = STRBUF_INIT;
 780                 strbuf_addf(&buf, "--depth=%lu", options.depth);
 781                 depth_arg = strbuf_detach(&buf, NULL);
 782                 argv[argc++] = depth_arg;
 783         }
 784         argv[argc++] = url.buf;
 785         argv[argc++] = NULL;
 786
 787         for (i = 0; i < nr_heads; i++) {
 788                 struct ref *ref = to_fetch[i];
 789                 if (!*ref->name)
 790                         die("cannot fetch by sha1 over smart http");
 791                 packet_buf_write(&preamble, "%s %s\n",
 792                                  oid_to_hex(&ref->old_oid), ref->name);
 793         }
 794         packet_buf_flush(&preamble);
 795
 796         memset(&rpc, 0, sizeof(rpc));
 797         rpc.service_name = "git-upload-pack",
 798         rpc.argv = argv;
 799         rpc.stdin_preamble = &preamble;
 800         rpc.gzip_request = 1;
 801
 802         err = rpc_service(&rpc, heads);
 803         if (rpc.result.len)
 804                 write_or_die(1, rpc.result.buf, rpc.result.len);
 805         strbuf_release(&rpc.result);
 806         strbuf_release(&preamble);
 807         free(depth_arg);
 808         return err;
 809 }
 810
 811 static int fetch(int nr_heads, struct ref **to_fetch)
 812 {
 813         struct discovery *d = discover_refs("git-upload-pack", 0);
 814         if (d->proto_git)
 815                 return fetch_git(d, nr_heads, to_fetch);
 816         else
 817                 return fetch_dumb(nr_heads, to_fetch);
 818 }
 819
 820 static void parse_fetch(struct strbuf *buf)
 821 {
 822         struct ref **to_fetch = NULL;
 823         struct ref *list_head = NULL;
 824         struct ref **list = &list_head;
 825         int alloc_heads = 0, nr_heads = 0;
 826
 827         do {
 828                 const char *p;
 829                 if (skip_prefix(buf->buf, "fetch ", &p)) {
 830                         const char *name;
 831                         struct ref *ref;
 832                         struct object_id old_oid;
 833
 834                         if (get_oid_hex(p, &old_oid))
 835                                 die("protocol error: expected sha/ref, got %s'", p);
 836                         if (p[GIT_SHA1_HEXSZ] == ' ')
 837                                 name = p + GIT_SHA1_HEXSZ + 1;
 838                         else if (!p[GIT_SHA1_HEXSZ])
 839                                 name = "";
 840                         else
 841                                 die("protocol error: expected sha/ref, got %s'", p);
 842
 843                         ref = alloc_ref(name);
 844                         oidcpy(&ref->old_oid, &old_oid);
 845
 846                         *list = ref;
 847                         list = &ref->next;
 848
 849                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 850                         to_fetch[nr_heads++] = ref;
 851                 }
 852                 else
 853                         die("http transport does not support %s", buf->buf);
 854
 855                 strbuf_reset(buf);
 856                 if (strbuf_getline_lf(buf, stdin) == EOF)
 857                         return;
 858                 if (!*buf->buf)
 859                         break;
 860         } while (1);
 861
 862         if (fetch(nr_heads, to_fetch))
 863                 exit(128); /* error already reported */
 864         free_refs(list_head);
 865         free(to_fetch);
 866
 867         printf("\n");
 868         fflush(stdout);
 869         strbuf_reset(buf);
 870 }
 871
 872 static int push_dav(int nr_spec, char **specs)
 873 {
 874         struct child_process child = CHILD_PROCESS_INIT;
 875         size_t i;
 876
 877         child.git_cmd = 1;
 878         argv_array_push(&child.args, "http-push");
 879         argv_array_push(&child.args, "--helper-status");
 880         if (options.dry_run)
 881                 argv_array_push(&child.args, "--dry-run");
 882         if (options.verbosity > 1)
 883                 argv_array_push(&child.args, "--verbose");
 884         argv_array_push(&child.args, url.buf);
 885         for (i = 0; i < nr_spec; i++)
 886                 argv_array_push(&child.args, specs[i]);
 887
 888         if (run_command(&child))
 889                 die("git-http-push failed");
 890         return 0;
 891 }
 892
 893 static int push_git(struct discovery *heads, int nr_spec, char **specs)
 894 {
 895         struct rpc_state rpc;
 896         int i, err;
 897         struct argv_array args;
 898         struct string_list_item *cas_option;
 899         struct strbuf preamble = STRBUF_INIT;
 900
 901         argv_array_init(&args);
 902         argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 903                          NULL);
 904
 905         if (options.thin)
 906                 argv_array_push(&args, "--thin");
 907         if (options.dry_run)
 908                 argv_array_push(&args, "--dry-run");
 909         if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
 910                 argv_array_push(&args, "--signed=yes");
 911         else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
 912                 argv_array_push(&args, "--signed=if-asked");
 913         if (options.verbosity == 0)
 914                 argv_array_push(&args, "--quiet");
 915         else if (options.verbosity > 1)
 916                 argv_array_push(&args, "--verbose");
 917         argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 918         for_each_string_list_item(cas_option, &cas_options)
 919                 argv_array_push(&args, cas_option->string);
 920         argv_array_push(&args, url.buf);
 921
 922         argv_array_push(&args, "--stdin");
 923         for (i = 0; i < nr_spec; i++)
 924                 packet_buf_write(&preamble, "%s\n", specs[i]);
 925         packet_buf_flush(&preamble);
 926
 927         memset(&rpc, 0, sizeof(rpc));
 928         rpc.service_name = "git-receive-pack",
 929         rpc.argv = args.argv;
 930         rpc.stdin_preamble = &preamble;
 931
 932         err = rpc_service(&rpc, heads);
 933         if (rpc.result.len)
 934                 write_or_die(1, rpc.result.buf, rpc.result.len);
 935         strbuf_release(&rpc.result);
 936         strbuf_release(&preamble);
 937         argv_array_clear(&args);
 938         return err;
 939 }
 940
 941 static int push(int nr_spec, char **specs)
 942 {
 943         struct discovery *heads = discover_refs("git-receive-pack", 1);
 944         int ret;
 945
 946         if (heads->proto_git)
 947                 ret = push_git(heads, nr_spec, specs);
 948         else
 949                 ret = push_dav(nr_spec, specs);
 950         free_discovery(heads);
 951         return ret;
 952 }
 953
 954 static void parse_push(struct strbuf *buf)
 955 {
 956         char **specs = NULL;
 957         int alloc_spec = 0, nr_spec = 0, i, ret;
 958
 959         do {
 960                 if (starts_with(buf->buf, "push ")) {
 961                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 962                         specs[nr_spec++] = xstrdup(buf->buf + 5);
 963                 }
 964                 else
 965                         die("http transport does not support %s", buf->buf);
 966
 967                 strbuf_reset(buf);
 968                 if (strbuf_getline_lf(buf, stdin) == EOF)
 969                         goto free_specs;
 970                 if (!*buf->buf)
 971                         break;
 972         } while (1);
 973
 974         ret = push(nr_spec, specs);
 975         printf("\n");
 976         fflush(stdout);
 977
 978         if (ret)
 979                 exit(128); /* error already reported */
 980
 981  free_specs:
 982         for (i = 0; i < nr_spec; i++)
 983                 free(specs[i]);
 984         free(specs);
 985 }
 986
 987 int main(int argc, const char **argv)
 988 {
 989         struct strbuf buf = STRBUF_INIT;
 990         int nongit;
 991
 992         git_setup_gettext();
 993
 994         git_extract_argv0_path(argv[0]);
 995         setup_git_directory_gently(&nongit);
 996         if (argc < 2) {
 997                 error("remote-curl: usage: git remote-curl <remote> [<url>]");
 998                 return 1;
 999         }
1000
1001         options.verbosity = 1;
1002         options.progress = !!isatty(2);
1003         options.thin = 1;
1004
1005         remote = remote_get(argv[1]);
1006
1007         if (argc > 2) {
1008                 end_url_with_slash(&url, argv[2]);
1009         } else {
1010                 end_url_with_slash(&url, remote->url[0]);
1011         }
1012
1013         http_init(remote, url.buf, 0);
1014
1015         do {
1016                 const char *arg;
1017
1018                 if (strbuf_getline_lf(&buf, stdin) == EOF) {
1019                         if (ferror(stdin))
1020                                 error("remote-curl: error reading command stream from git");
1021                         return 1;
1022                 }
1023                 if (buf.len == 0)
1024                         break;
1025                 if (starts_with(buf.buf, "fetch ")) {
1026                         if (nongit)
1027                                 die("remote-curl: fetch attempted without a local repo");
1028                         parse_fetch(&buf);
1029
1030                 } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1031                         int for_push = !!strstr(buf.buf + 4, "for-push");
1032                         output_refs(get_refs(for_push));
1033
1034                 } else if (starts_with(buf.buf, "push ")) {
1035                         parse_push(&buf);
1036
1037                 } else if (skip_prefix(buf.buf, "option ", &arg)) {
1038                         char *value = strchr(arg, ' ');
1039                         int result;
1040
1041                         if (value)
1042                                 *value++ = '\0';
1043                         else
1044                                 value = "true";
1045
1046                         result = set_option(arg, value);
1047                         if (!result)
1048                                 printf("ok\n");
1049                         else if (result < 0)
1050                                 printf("error invalid value\n");
1051                         else
1052                                 printf("unsupported\n");
1053                         fflush(stdout);
1054
1055                 } else if (!strcmp(buf.buf, "capabilities")) {
1056                         printf("fetch\n");
1057                         printf("option\n");
1058                         printf("push\n");
1059                         printf("check-connectivity\n");
1060                         printf("\n");
1061                         fflush(stdout);
1062                 } else {
1063                         error("remote-curl: unknown command '%s' from git", buf.buf);
1064                         return 1;
1065                 }
1066                 strbuf_reset(&buf);
1067         } while (1);
1068
1069         http_cleanup();
1070
1071         return 0;
1072 }