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

   1 #include "cache.h"
   2 #include "remote.h"
   3 #include "strbuf.h"
   4 #include "walker.h"
   5 #include "http.h"
   6 #include "exec_cmd.h"
   7 #include "run-command.h"
   8 #include "pkt-line.h"
   9 #include "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 http_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(&http_options, 0, sizeof(http_options));
 275         http_options.content_type = &type;
 276         http_options.charset = &charset;
 277         http_options.effective_url = &effective_url;
 278         http_options.base_url = &url;
 279         http_options.initial_request = 1;
 280         http_options.no_cache = 1;
 281         http_options.keep_error = 1;
 282
 283         http_ret = http_get_strbuf(refs_url.buf, &buffer, &http_options);
 284         switch (http_ret) {
 285         case HTTP_OK:
 286                 break;
 287         case HTTP_MISSING_TARGET:
 288                 show_http_message(&type, &charset, &buffer);
 289                 die("repository '%s' not found", url.buf);
 290         case HTTP_NOAUTH:
 291                 show_http_message(&type, &charset, &buffer);
 292                 die("Authentication failed for '%s'", url.buf);
 293         default:
 294                 show_http_message(&type, &charset, &buffer);
 295                 die("unable to access '%s': %s", url.buf, curl_errorstr);
 296         }
 297
 298         if (options.verbosity && !starts_with(refs_url.buf, url.buf))
 299                 warning(_("redirecting to %s"), url.buf);
 300
 301         last= xcalloc(1, sizeof(*last_discovery));
 302         last->service = service;
 303         last->buf_alloc = strbuf_detach(&buffer, &last->len);
 304         last->buf = last->buf_alloc;
 305
 306         strbuf_addf(&exp, "application/x-%s-advertisement", service);
 307         if (maybe_smart &&
 308             (5 <= last->len && last->buf[4] == '#') &&
 309             !strbuf_cmp(&exp, &type)) {
 310                 char *line;
 311
 312                 /*
 313                  * smart HTTP response; validate that the service
 314                  * pkt-line matches our request.
 315                  */
 316                 line = packet_read_line_buf(&last->buf, &last->len, NULL);
 317
 318                 strbuf_reset(&exp);
 319                 strbuf_addf(&exp, "# service=%s", service);
 320                 if (strcmp(line, exp.buf))
 321                         die("invalid server response; got '%s'", line);
 322                 strbuf_release(&exp);
 323
 324                 /* The header can include additional metadata lines, up
 325                  * until a packet flush marker.  Ignore these now, but
 326                  * in the future we might start to scan them.
 327                  */
 328                 while (packet_read_line_buf(&last->buf, &last->len, NULL))
 329                         ;
 330
 331                 last->proto_git = 1;
 332         }
 333
 334         if (last->proto_git)
 335                 last->refs = parse_git_refs(last, for_push);
 336         else
 337                 last->refs = parse_info_refs(last);
 338
 339         strbuf_release(&refs_url);
 340         strbuf_release(&exp);
 341         strbuf_release(&type);
 342         strbuf_release(&charset);
 343         strbuf_release(&effective_url);
 344         strbuf_release(&buffer);
 345         last_discovery = last;
 346         return last;
 347 }
 348
 349 static struct ref *get_refs(int for_push)
 350 {
 351         struct discovery *heads;
 352
 353         if (for_push)
 354                 heads = discover_refs("git-receive-pack", for_push);
 355         else
 356                 heads = discover_refs("git-upload-pack", for_push);
 357
 358         return heads->refs;
 359 }
 360
 361 static void output_refs(struct ref *refs)
 362 {
 363         struct ref *posn;
 364         for (posn = refs; posn; posn = posn->next) {
 365                 if (posn->symref)
 366                         printf("@%s %s\n", posn->symref, posn->name);
 367                 else
 368                         printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name);
 369         }
 370         printf("\n");
 371         fflush(stdout);
 372 }
 373
 374 struct rpc_state {
 375         const char *service_name;
 376         const char **argv;
 377         struct strbuf *stdin_preamble;
 378         char *service_url;
 379         char *hdr_content_type;
 380         char *hdr_accept;
 381         char *buf;
 382         size_t alloc;
 383         size_t len;
 384         size_t pos;
 385         int in;
 386         int out;
 387         struct strbuf result;
 388         unsigned gzip_request : 1;
 389         unsigned initial_buffer : 1;
 390 };
 391
 392 static size_t rpc_out(void *ptr, size_t eltsize,
 393                 size_t nmemb, void *buffer_)
 394 {
 395         size_t max = eltsize * nmemb;
 396         struct rpc_state *rpc = buffer_;
 397         size_t avail = rpc->len - rpc->pos;
 398
 399         if (!avail) {
 400                 rpc->initial_buffer = 0;
 401                 avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 402                 if (!avail)
 403                         return 0;
 404                 rpc->pos = 0;
 405                 rpc->len = avail;
 406         }
 407
 408         if (max < avail)
 409                 avail = max;
 410         memcpy(ptr, rpc->buf + rpc->pos, avail);
 411         rpc->pos += avail;
 412         return avail;
 413 }
 414
 415 #ifndef NO_CURL_IOCTL
 416 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 417 {
 418         struct rpc_state *rpc = clientp;
 419
 420         switch (cmd) {
 421         case CURLIOCMD_NOP:
 422                 return CURLIOE_OK;
 423
 424         case CURLIOCMD_RESTARTREAD:
 425                 if (rpc->initial_buffer) {
 426                         rpc->pos = 0;
 427                         return CURLIOE_OK;
 428                 }
 429                 error("unable to rewind rpc post data - try increasing http.postBuffer");
 430                 return CURLIOE_FAILRESTART;
 431
 432         default:
 433                 return CURLIOE_UNKNOWNCMD;
 434         }
 435 }
 436 #endif
 437
 438 static size_t rpc_in(char *ptr, size_t eltsize,
 439                 size_t nmemb, void *buffer_)
 440 {
 441         size_t size = eltsize * nmemb;
 442         struct rpc_state *rpc = buffer_;
 443         write_or_die(rpc->in, ptr, size);
 444         return size;
 445 }
 446
 447 static int run_slot(struct active_request_slot *slot,
 448                     struct slot_results *results)
 449 {
 450         int err;
 451         struct slot_results results_buf;
 452
 453         if (!results)
 454                 results = &results_buf;
 455
 456         err = run_one_slot(slot, results);
 457
 458         if (err != HTTP_OK && err != HTTP_REAUTH) {
 459                 struct strbuf msg = STRBUF_INIT;
 460                 if (results->http_code && results->http_code != 200)
 461                         strbuf_addf(&msg, "HTTP %ld", results->http_code);
 462                 if (results->curl_result != CURLE_OK) {
 463                         if (msg.len)
 464                                 strbuf_addch(&msg, ' ');
 465                         strbuf_addf(&msg, "curl %d", results->curl_result);
 466                         if (curl_errorstr[0]) {
 467                                 strbuf_addch(&msg, ' ');
 468                                 strbuf_addstr(&msg, curl_errorstr);
 469                         }
 470                 }
 471                 error("RPC failed; %s", msg.buf);
 472                 strbuf_release(&msg);
 473         }
 474
 475         return err;
 476 }
 477
 478 static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 479 {
 480         struct active_request_slot *slot;
 481         struct curl_slist *headers = http_copy_default_headers();
 482         struct strbuf buf = STRBUF_INIT;
 483         int err;
 484
 485         slot = get_active_slot();
 486
 487         headers = curl_slist_append(headers, rpc->hdr_content_type);
 488         headers = curl_slist_append(headers, rpc->hdr_accept);
 489
 490         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 491         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 492         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 493         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 494         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 495         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 496         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 497         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 498         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 499
 500         err = run_slot(slot, results);
 501
 502         curl_slist_free_all(headers);
 503         strbuf_release(&buf);
 504         return err;
 505 }
 506
 507 static int post_rpc(struct rpc_state *rpc)
 508 {
 509         struct active_request_slot *slot;
 510         struct curl_slist *headers = http_copy_default_headers();
 511         int use_gzip = rpc->gzip_request;
 512         char *gzip_body = NULL;
 513         size_t gzip_size = 0;
 514         int err, large_request = 0;
 515         int needs_100_continue = 0;
 516
 517         /* Try to load the entire request, if we can fit it into the
 518          * allocated buffer space we can use HTTP/1.0 and avoid the
 519          * chunked encoding mess.
 520          */
 521         while (1) {
 522                 size_t left = rpc->alloc - rpc->len;
 523                 char *buf = rpc->buf + rpc->len;
 524                 int n;
 525
 526                 if (left < LARGE_PACKET_MAX) {
 527                         large_request = 1;
 528                         use_gzip = 0;
 529                         break;
 530                 }
 531
 532                 n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 533                 if (!n)
 534                         break;
 535                 rpc->len += n;
 536         }
 537
 538         if (large_request) {
 539                 struct slot_results results;
 540
 541                 do {
 542                         err = probe_rpc(rpc, &results);
 543                         if (err == HTTP_REAUTH)
 544                                 credential_fill(&http_auth);
 545                 } while (err == HTTP_REAUTH);
 546                 if (err != HTTP_OK)
 547                         return -1;
 548
 549                 if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 550                         needs_100_continue = 1;
 551         }
 552
 553         headers = curl_slist_append(headers, rpc->hdr_content_type);
 554         headers = curl_slist_append(headers, rpc->hdr_accept);
 555         headers = curl_slist_append(headers, needs_100_continue ?
 556                 "Expect: 100-continue" : "Expect:");
 557
 558 retry:
 559         slot = get_active_slot();
 560
 561         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 562         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 563         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 564         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 565
 566         if (large_request) {
 567                 /* The request body is large and the size cannot be predicted.
 568                  * We must use chunked encoding to send it.
 569                  */
 570                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 571                 rpc->initial_buffer = 1;
 572                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 573                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 574 #ifndef NO_CURL_IOCTL
 575                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 576                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 577 #endif
 578                 if (options.verbosity > 1) {
 579                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 580                         fflush(stderr);
 581                 }
 582
 583         } else if (gzip_body) {
 584                 /*
 585                  * If we are looping to retry authentication, then the previous
 586                  * run will have set up the headers and gzip buffer already,
 587                  * and we just need to send it.
 588                  */
 589                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 590                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 591
 592         } else if (use_gzip && 1024 < rpc->len) {
 593                 /* The client backend isn't giving us compressed data so
 594                  * we can try to deflate it ourselves, this may save on.
 595                  * the transfer time.
 596                  */
 597                 git_zstream stream;
 598                 int ret;
 599
 600                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 601                 gzip_size = git_deflate_bound(&stream, rpc->len);
 602                 gzip_body = xmalloc(gzip_size);
 603
 604                 stream.next_in = (unsigned char *)rpc->buf;
 605                 stream.avail_in = rpc->len;
 606                 stream.next_out = (unsigned char *)gzip_body;
 607                 stream.avail_out = gzip_size;
 608
 609                 ret = git_deflate(&stream, Z_FINISH);
 610                 if (ret != Z_STREAM_END)
 611                         die("cannot deflate request; zlib deflate error %d", ret);
 612
 613                 ret = git_deflate_end_gently(&stream);
 614                 if (ret != Z_OK)
 615                         die("cannot deflate request; zlib end error %d", ret);
 616
 617                 gzip_size = stream.total_out;
 618
 619                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 620                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 621                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 622
 623                 if (options.verbosity > 1) {
 624                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 625                                 rpc->service_name,
 626                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
 627                         fflush(stderr);
 628                 }
 629         } else {
 630                 /* We know the complete request size in advance, use the
 631                  * more normal Content-Length approach.
 632                  */
 633                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 634                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 635                 if (options.verbosity > 1) {
 636                         fprintf(stderr, "POST %s (%lu bytes)\n",
 637                                 rpc->service_name, (unsigned long)rpc->len);
 638                         fflush(stderr);
 639                 }
 640         }
 641
 642         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 643         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 644         curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 645
 646         err = run_slot(slot, NULL);
 647         if (err == HTTP_REAUTH && !large_request) {
 648                 credential_fill(&http_auth);
 649                 goto retry;
 650         }
 651         if (err != HTTP_OK)
 652                 err = -1;
 653
 654         curl_slist_free_all(headers);
 655         free(gzip_body);
 656         return err;
 657 }
 658
 659 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 660 {
 661         const char *svc = rpc->service_name;
 662         struct strbuf buf = STRBUF_INIT;
 663         struct strbuf *preamble = rpc->stdin_preamble;
 664         struct child_process client = CHILD_PROCESS_INIT;
 665         int err = 0;
 666
 667         client.in = -1;
 668         client.out = -1;
 669         client.git_cmd = 1;
 670         client.argv = rpc->argv;
 671         if (start_command(&client))
 672                 exit(1);
 673         if (preamble)
 674                 write_or_die(client.in, preamble->buf, preamble->len);
 675         if (heads)
 676                 write_or_die(client.in, heads->buf, heads->len);
 677
 678         rpc->alloc = http_post_buffer;
 679         rpc->buf = xmalloc(rpc->alloc);
 680         rpc->in = client.in;
 681         rpc->out = client.out;
 682         strbuf_init(&rpc->result, 0);
 683
 684         strbuf_addf(&buf, "%s%s", url.buf, svc);
 685         rpc->service_url = strbuf_detach(&buf, NULL);
 686
 687         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 688         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 689
 690         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 691         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 692
 693         while (!err) {
 694                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 695                 if (!n)
 696                         break;
 697                 rpc->pos = 0;
 698                 rpc->len = n;
 699                 err |= post_rpc(rpc);
 700         }
 701
 702         close(client.in);
 703         client.in = -1;
 704         if (!err) {
 705                 strbuf_read(&rpc->result, client.out, 0);
 706         } else {
 707                 char buf[4096];
 708                 for (;;)
 709                         if (xread(client.out, buf, sizeof(buf)) <= 0)
 710                                 break;
 711         }
 712
 713         close(client.out);
 714         client.out = -1;
 715
 716         err |= finish_command(&client);
 717         free(rpc->service_url);
 718         free(rpc->hdr_content_type);
 719         free(rpc->hdr_accept);
 720         free(rpc->buf);
 721         strbuf_release(&buf);
 722         return err;
 723 }
 724
 725 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 726 {
 727         struct walker *walker;
 728         char **targets;
 729         int ret, i;
 730
 731         ALLOC_ARRAY(targets, nr_heads);
 732         if (options.depth)
 733                 die("dumb http transport does not support --depth");
 734         for (i = 0; i < nr_heads; i++)
 735                 targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
 736
 737         walker = get_http_walker(url.buf);
 738         walker->get_all = 1;
 739         walker->get_tree = 1;
 740         walker->get_history = 1;
 741         walker->get_verbosely = options.verbosity >= 3;
 742         walker->get_recover = 0;
 743         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 744         walker_free(walker);
 745
 746         for (i = 0; i < nr_heads; i++)
 747                 free(targets[i]);
 748         free(targets);
 749
 750         return ret ? error("fetch failed.") : 0;
 751 }
 752
 753 static int fetch_git(struct discovery *heads,
 754         int nr_heads, struct ref **to_fetch)
 755 {
 756         struct rpc_state rpc;
 757         struct strbuf preamble = STRBUF_INIT;
 758         char *depth_arg = NULL;
 759         int argc = 0, i, err;
 760         const char *argv[17];
 761
 762         argv[argc++] = "fetch-pack";
 763         argv[argc++] = "--stateless-rpc";
 764         argv[argc++] = "--stdin";
 765         argv[argc++] = "--lock-pack";
 766         if (options.followtags)
 767                 argv[argc++] = "--include-tag";
 768         if (options.thin)
 769                 argv[argc++] = "--thin";
 770         if (options.verbosity >= 3) {
 771                 argv[argc++] = "-v";
 772                 argv[argc++] = "-v";
 773         }
 774         if (options.check_self_contained_and_connected)
 775                 argv[argc++] = "--check-self-contained-and-connected";
 776         if (options.cloning)
 777                 argv[argc++] = "--cloning";
 778         if (options.update_shallow)
 779                 argv[argc++] = "--update-shallow";
 780         if (!options.progress)
 781                 argv[argc++] = "--no-progress";
 782         if (options.depth) {
 783                 struct strbuf buf = STRBUF_INIT;
 784                 strbuf_addf(&buf, "--depth=%lu", options.depth);
 785                 depth_arg = strbuf_detach(&buf, NULL);
 786                 argv[argc++] = depth_arg;
 787         }
 788         argv[argc++] = url.buf;
 789         argv[argc++] = NULL;
 790
 791         for (i = 0; i < nr_heads; i++) {
 792                 struct ref *ref = to_fetch[i];
 793                 if (!*ref->name)
 794                         die("cannot fetch by sha1 over smart http");
 795                 packet_buf_write(&preamble, "%s %s\n",
 796                                  oid_to_hex(&ref->old_oid), ref->name);
 797         }
 798         packet_buf_flush(&preamble);
 799
 800         memset(&rpc, 0, sizeof(rpc));
 801         rpc.service_name = "git-upload-pack",
 802         rpc.argv = argv;
 803         rpc.stdin_preamble = &preamble;
 804         rpc.gzip_request = 1;
 805
 806         err = rpc_service(&rpc, heads);
 807         if (rpc.result.len)
 808                 write_or_die(1, rpc.result.buf, rpc.result.len);
 809         strbuf_release(&rpc.result);
 810         strbuf_release(&preamble);
 811         free(depth_arg);
 812         return err;
 813 }
 814
 815 static int fetch(int nr_heads, struct ref **to_fetch)
 816 {
 817         struct discovery *d = discover_refs("git-upload-pack", 0);
 818         if (d->proto_git)
 819                 return fetch_git(d, nr_heads, to_fetch);
 820         else
 821                 return fetch_dumb(nr_heads, to_fetch);
 822 }
 823
 824 static void parse_fetch(struct strbuf *buf)
 825 {
 826         struct ref **to_fetch = NULL;
 827         struct ref *list_head = NULL;
 828         struct ref **list = &list_head;
 829         int alloc_heads = 0, nr_heads = 0;
 830
 831         do {
 832                 const char *p;
 833                 if (skip_prefix(buf->buf, "fetch ", &p)) {
 834                         const char *name;
 835                         struct ref *ref;
 836                         struct object_id old_oid;
 837
 838                         if (get_oid_hex(p, &old_oid))
 839                                 die("protocol error: expected sha/ref, got %s'", p);
 840                         if (p[GIT_SHA1_HEXSZ] == ' ')
 841                                 name = p + GIT_SHA1_HEXSZ + 1;
 842                         else if (!p[GIT_SHA1_HEXSZ])
 843                                 name = "";
 844                         else
 845                                 die("protocol error: expected sha/ref, got %s'", p);
 846
 847                         ref = alloc_ref(name);
 848                         oidcpy(&ref->old_oid, &old_oid);
 849
 850                         *list = ref;
 851                         list = &ref->next;
 852
 853                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 854                         to_fetch[nr_heads++] = ref;
 855                 }
 856                 else
 857                         die("http transport does not support %s", buf->buf);
 858
 859                 strbuf_reset(buf);
 860                 if (strbuf_getline_lf(buf, stdin) == EOF)
 861                         return;
 862                 if (!*buf->buf)
 863                         break;
 864         } while (1);
 865
 866         if (fetch(nr_heads, to_fetch))
 867                 exit(128); /* error already reported */
 868         free_refs(list_head);
 869         free(to_fetch);
 870
 871         printf("\n");
 872         fflush(stdout);
 873         strbuf_reset(buf);
 874 }
 875
 876 static int push_dav(int nr_spec, char **specs)
 877 {
 878         struct child_process child = CHILD_PROCESS_INIT;
 879         size_t i;
 880
 881         child.git_cmd = 1;
 882         argv_array_push(&child.args, "http-push");
 883         argv_array_push(&child.args, "--helper-status");
 884         if (options.dry_run)
 885                 argv_array_push(&child.args, "--dry-run");
 886         if (options.verbosity > 1)
 887                 argv_array_push(&child.args, "--verbose");
 888         argv_array_push(&child.args, url.buf);
 889         for (i = 0; i < nr_spec; i++)
 890                 argv_array_push(&child.args, specs[i]);
 891
 892         if (run_command(&child))
 893                 die("git-http-push failed");
 894         return 0;
 895 }
 896
 897 static int push_git(struct discovery *heads, int nr_spec, char **specs)
 898 {
 899         struct rpc_state rpc;
 900         int i, err;
 901         struct argv_array args;
 902         struct string_list_item *cas_option;
 903         struct strbuf preamble = STRBUF_INIT;
 904
 905         argv_array_init(&args);
 906         argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 907                          NULL);
 908
 909         if (options.thin)
 910                 argv_array_push(&args, "--thin");
 911         if (options.dry_run)
 912                 argv_array_push(&args, "--dry-run");
 913         if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
 914                 argv_array_push(&args, "--signed=yes");
 915         else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
 916                 argv_array_push(&args, "--signed=if-asked");
 917         if (options.verbosity == 0)
 918                 argv_array_push(&args, "--quiet");
 919         else if (options.verbosity > 1)
 920                 argv_array_push(&args, "--verbose");
 921         argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 922         for_each_string_list_item(cas_option, &cas_options)
 923                 argv_array_push(&args, cas_option->string);
 924         argv_array_push(&args, url.buf);
 925
 926         argv_array_push(&args, "--stdin");
 927         for (i = 0; i < nr_spec; i++)
 928                 packet_buf_write(&preamble, "%s\n", specs[i]);
 929         packet_buf_flush(&preamble);
 930
 931         memset(&rpc, 0, sizeof(rpc));
 932         rpc.service_name = "git-receive-pack",
 933         rpc.argv = args.argv;
 934         rpc.stdin_preamble = &preamble;
 935
 936         err = rpc_service(&rpc, heads);
 937         if (rpc.result.len)
 938                 write_or_die(1, rpc.result.buf, rpc.result.len);
 939         strbuf_release(&rpc.result);
 940         strbuf_release(&preamble);
 941         argv_array_clear(&args);
 942         return err;
 943 }
 944
 945 static int push(int nr_spec, char **specs)
 946 {
 947         struct discovery *heads = discover_refs("git-receive-pack", 1);
 948         int ret;
 949
 950         if (heads->proto_git)
 951                 ret = push_git(heads, nr_spec, specs);
 952         else
 953                 ret = push_dav(nr_spec, specs);
 954         free_discovery(heads);
 955         return ret;
 956 }
 957
 958 static void parse_push(struct strbuf *buf)
 959 {
 960         char **specs = NULL;
 961         int alloc_spec = 0, nr_spec = 0, i, ret;
 962
 963         do {
 964                 if (starts_with(buf->buf, "push ")) {
 965                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 966                         specs[nr_spec++] = xstrdup(buf->buf + 5);
 967                 }
 968                 else
 969                         die("http transport does not support %s", buf->buf);
 970
 971                 strbuf_reset(buf);
 972                 if (strbuf_getline_lf(buf, stdin) == EOF)
 973                         goto free_specs;
 974                 if (!*buf->buf)
 975                         break;
 976         } while (1);
 977
 978         ret = push(nr_spec, specs);
 979         printf("\n");
 980         fflush(stdout);
 981
 982         if (ret)
 983                 exit(128); /* error already reported */
 984
 985  free_specs:
 986         for (i = 0; i < nr_spec; i++)
 987                 free(specs[i]);
 988         free(specs);
 989 }
 990
 991 int cmd_main(int argc, const char **argv)
 992 {
 993         struct strbuf buf = STRBUF_INIT;
 994         int nongit;
 995
 996         setup_git_directory_gently(&nongit);
 997         if (argc < 2) {
 998                 error("remote-curl: usage: git remote-curl <remote> [<url>]");
 999                 return 1;
1000         }
1001
1002         options.verbosity = 1;
1003         options.progress = !!isatty(2);
1004         options.thin = 1;
1005
1006         remote = remote_get(argv[1]);
1007
1008         if (argc > 2) {
1009                 end_url_with_slash(&url, argv[2]);
1010         } else {
1011                 end_url_with_slash(&url, remote->url[0]);
1012         }
1013
1014         http_init(remote, url.buf, 0);
1015
1016         do {
1017                 const char *arg;
1018
1019                 if (strbuf_getline_lf(&buf, stdin) == EOF) {
1020                         if (ferror(stdin))
1021                                 error("remote-curl: error reading command stream from git");
1022                         return 1;
1023                 }
1024                 if (buf.len == 0)
1025                         break;
1026                 if (starts_with(buf.buf, "fetch ")) {
1027                         if (nongit)
1028                                 die("remote-curl: fetch attempted without a local repo");
1029                         parse_fetch(&buf);
1030
1031                 } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1032                         int for_push = !!strstr(buf.buf + 4, "for-push");
1033                         output_refs(get_refs(for_push));
1034
1035                 } else if (starts_with(buf.buf, "push ")) {
1036                         parse_push(&buf);
1037
1038                 } else if (skip_prefix(buf.buf, "option ", &arg)) {
1039                         char *value = strchr(arg, ' ');
1040                         int result;
1041
1042                         if (value)
1043                                 *value++ = '\0';
1044                         else
1045                                 value = "true";
1046
1047                         result = set_option(arg, value);
1048                         if (!result)
1049                                 printf("ok\n");
1050                         else if (result < 0)
1051                                 printf("error invalid value\n");
1052                         else
1053                                 printf("unsupported\n");
1054                         fflush(stdout);
1055
1056                 } else if (!strcmp(buf.buf, "capabilities")) {
1057                         printf("fetch\n");
1058                         printf("option\n");
1059                         printf("push\n");
1060                         printf("check-connectivity\n");
1061                         printf("\n");
1062                         fflush(stdout);
1063                 } else {
1064                         error("remote-curl: unknown command '%s' from git", buf.buf);
1065                         return 1;
1066                 }
1067                 strbuf_reset(&buf);
1068         } while (1);
1069
1070         http_cleanup();
1071
1072         return 0;
1073 }