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                 error("RPC failed; result=%d, HTTP code = %ld",
 456                       results->curl_result, results->http_code);
 457         }
 458
 459         return err;
 460 }
 461
 462 static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 463 {
 464         struct active_request_slot *slot;
 465         struct curl_slist *headers = NULL;
 466         struct strbuf buf = STRBUF_INIT;
 467         int err;
 468
 469         slot = get_active_slot();
 470
 471         headers = curl_slist_append(headers, rpc->hdr_content_type);
 472         headers = curl_slist_append(headers, rpc->hdr_accept);
 473
 474         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 475         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 476         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 477         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 478         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 479         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 480         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 481         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 482         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 483
 484         err = run_slot(slot, results);
 485
 486         curl_slist_free_all(headers);
 487         strbuf_release(&buf);
 488         return err;
 489 }
 490
 491 static int post_rpc(struct rpc_state *rpc)
 492 {
 493         struct active_request_slot *slot;
 494         struct curl_slist *headers = NULL;
 495         int use_gzip = rpc->gzip_request;
 496         char *gzip_body = NULL;
 497         size_t gzip_size = 0;
 498         int err, large_request = 0;
 499         int needs_100_continue = 0;
 500
 501         /* Try to load the entire request, if we can fit it into the
 502          * allocated buffer space we can use HTTP/1.0 and avoid the
 503          * chunked encoding mess.
 504          */
 505         while (1) {
 506                 size_t left = rpc->alloc - rpc->len;
 507                 char *buf = rpc->buf + rpc->len;
 508                 int n;
 509
 510                 if (left < LARGE_PACKET_MAX) {
 511                         large_request = 1;
 512                         use_gzip = 0;
 513                         break;
 514                 }
 515
 516                 n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 517                 if (!n)
 518                         break;
 519                 rpc->len += n;
 520         }
 521
 522         if (large_request) {
 523                 struct slot_results results;
 524
 525                 do {
 526                         err = probe_rpc(rpc, &results);
 527                         if (err == HTTP_REAUTH)
 528                                 credential_fill(&http_auth);
 529                 } while (err == HTTP_REAUTH);
 530                 if (err != HTTP_OK)
 531                         return -1;
 532
 533                 if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 534                         needs_100_continue = 1;
 535         }
 536
 537         headers = curl_slist_append(headers, rpc->hdr_content_type);
 538         headers = curl_slist_append(headers, rpc->hdr_accept);
 539         headers = curl_slist_append(headers, needs_100_continue ?
 540                 "Expect: 100-continue" : "Expect:");
 541
 542 retry:
 543         slot = get_active_slot();
 544
 545         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 546         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 547         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 548         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 549
 550         if (large_request) {
 551                 /* The request body is large and the size cannot be predicted.
 552                  * We must use chunked encoding to send it.
 553                  */
 554                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 555                 rpc->initial_buffer = 1;
 556                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 557                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 558 #ifndef NO_CURL_IOCTL
 559                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 560                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 561 #endif
 562                 if (options.verbosity > 1) {
 563                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 564                         fflush(stderr);
 565                 }
 566
 567         } else if (gzip_body) {
 568                 /*
 569                  * If we are looping to retry authentication, then the previous
 570                  * run will have set up the headers and gzip buffer already,
 571                  * and we just need to send it.
 572                  */
 573                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 574                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 575
 576         } else if (use_gzip && 1024 < rpc->len) {
 577                 /* The client backend isn't giving us compressed data so
 578                  * we can try to deflate it ourselves, this may save on.
 579                  * the transfer time.
 580                  */
 581                 git_zstream stream;
 582                 int ret;
 583
 584                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 585                 gzip_size = git_deflate_bound(&stream, rpc->len);
 586                 gzip_body = xmalloc(gzip_size);
 587
 588                 stream.next_in = (unsigned char *)rpc->buf;
 589                 stream.avail_in = rpc->len;
 590                 stream.next_out = (unsigned char *)gzip_body;
 591                 stream.avail_out = gzip_size;
 592
 593                 ret = git_deflate(&stream, Z_FINISH);
 594                 if (ret != Z_STREAM_END)
 595                         die("cannot deflate request; zlib deflate error %d", ret);
 596
 597                 ret = git_deflate_end_gently(&stream);
 598                 if (ret != Z_OK)
 599                         die("cannot deflate request; zlib end error %d", ret);
 600
 601                 gzip_size = stream.total_out;
 602
 603                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 604                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 605                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 606
 607                 if (options.verbosity > 1) {
 608                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 609                                 rpc->service_name,
 610                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
 611                         fflush(stderr);
 612                 }
 613         } else {
 614                 /* We know the complete request size in advance, use the
 615                  * more normal Content-Length approach.
 616                  */
 617                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 618                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 619                 if (options.verbosity > 1) {
 620                         fprintf(stderr, "POST %s (%lu bytes)\n",
 621                                 rpc->service_name, (unsigned long)rpc->len);
 622                         fflush(stderr);
 623                 }
 624         }
 625
 626         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 627         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 628         curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 629
 630         err = run_slot(slot, NULL);
 631         if (err == HTTP_REAUTH && !large_request) {
 632                 credential_fill(&http_auth);
 633                 goto retry;
 634         }
 635         if (err != HTTP_OK)
 636                 err = -1;
 637
 638         curl_slist_free_all(headers);
 639         free(gzip_body);
 640         return err;
 641 }
 642
 643 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 644 {
 645         const char *svc = rpc->service_name;
 646         struct strbuf buf = STRBUF_INIT;
 647         struct strbuf *preamble = rpc->stdin_preamble;
 648         struct child_process client = CHILD_PROCESS_INIT;
 649         int err = 0;
 650
 651         client.in = -1;
 652         client.out = -1;
 653         client.git_cmd = 1;
 654         client.argv = rpc->argv;
 655         if (start_command(&client))
 656                 exit(1);
 657         if (preamble)
 658                 write_or_die(client.in, preamble->buf, preamble->len);
 659         if (heads)
 660                 write_or_die(client.in, heads->buf, heads->len);
 661
 662         rpc->alloc = http_post_buffer;
 663         rpc->buf = xmalloc(rpc->alloc);
 664         rpc->in = client.in;
 665         rpc->out = client.out;
 666         strbuf_init(&rpc->result, 0);
 667
 668         strbuf_addf(&buf, "%s%s", url.buf, svc);
 669         rpc->service_url = strbuf_detach(&buf, NULL);
 670
 671         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 672         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 673
 674         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 675         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 676
 677         while (!err) {
 678                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 679                 if (!n)
 680                         break;
 681                 rpc->pos = 0;
 682                 rpc->len = n;
 683                 err |= post_rpc(rpc);
 684         }
 685
 686         close(client.in);
 687         client.in = -1;
 688         if (!err) {
 689                 strbuf_read(&rpc->result, client.out, 0);
 690         } else {
 691                 char buf[4096];
 692                 for (;;)
 693                         if (xread(client.out, buf, sizeof(buf)) <= 0)
 694                                 break;
 695         }
 696
 697         close(client.out);
 698         client.out = -1;
 699
 700         err |= finish_command(&client);
 701         free(rpc->service_url);
 702         free(rpc->hdr_content_type);
 703         free(rpc->hdr_accept);
 704         free(rpc->buf);
 705         strbuf_release(&buf);
 706         return err;
 707 }
 708
 709 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 710 {
 711         struct walker *walker;
 712         char **targets = xmalloc(nr_heads * sizeof(char*));
 713         int ret, i;
 714
 715         if (options.depth)
 716                 die("dumb http transport does not support --depth");
 717         for (i = 0; i < nr_heads; i++)
 718                 targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
 719
 720         walker = get_http_walker(url.buf);
 721         walker->get_all = 1;
 722         walker->get_tree = 1;
 723         walker->get_history = 1;
 724         walker->get_verbosely = options.verbosity >= 3;
 725         walker->get_recover = 0;
 726         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 727         walker_free(walker);
 728
 729         for (i = 0; i < nr_heads; i++)
 730                 free(targets[i]);
 731         free(targets);
 732
 733         return ret ? error("fetch failed.") : 0;
 734 }
 735
 736 static int fetch_git(struct discovery *heads,
 737         int nr_heads, struct ref **to_fetch)
 738 {
 739         struct rpc_state rpc;
 740         struct strbuf preamble = STRBUF_INIT;
 741         char *depth_arg = NULL;
 742         int argc = 0, i, err;
 743         const char *argv[17];
 744
 745         argv[argc++] = "fetch-pack";
 746         argv[argc++] = "--stateless-rpc";
 747         argv[argc++] = "--stdin";
 748         argv[argc++] = "--lock-pack";
 749         if (options.followtags)
 750                 argv[argc++] = "--include-tag";
 751         if (options.thin)
 752                 argv[argc++] = "--thin";
 753         if (options.verbosity >= 3) {
 754                 argv[argc++] = "-v";
 755                 argv[argc++] = "-v";
 756         }
 757         if (options.check_self_contained_and_connected)
 758                 argv[argc++] = "--check-self-contained-and-connected";
 759         if (options.cloning)
 760                 argv[argc++] = "--cloning";
 761         if (options.update_shallow)
 762                 argv[argc++] = "--update-shallow";
 763         if (!options.progress)
 764                 argv[argc++] = "--no-progress";
 765         if (options.depth) {
 766                 struct strbuf buf = STRBUF_INIT;
 767                 strbuf_addf(&buf, "--depth=%lu", options.depth);
 768                 depth_arg = strbuf_detach(&buf, NULL);
 769                 argv[argc++] = depth_arg;
 770         }
 771         argv[argc++] = url.buf;
 772         argv[argc++] = NULL;
 773
 774         for (i = 0; i < nr_heads; i++) {
 775                 struct ref *ref = to_fetch[i];
 776                 if (!*ref->name)
 777                         die("cannot fetch by sha1 over smart http");
 778                 packet_buf_write(&preamble, "%s %s\n",
 779                                  oid_to_hex(&ref->old_oid), ref->name);
 780         }
 781         packet_buf_flush(&preamble);
 782
 783         memset(&rpc, 0, sizeof(rpc));
 784         rpc.service_name = "git-upload-pack",
 785         rpc.argv = argv;
 786         rpc.stdin_preamble = &preamble;
 787         rpc.gzip_request = 1;
 788
 789         err = rpc_service(&rpc, heads);
 790         if (rpc.result.len)
 791                 write_or_die(1, rpc.result.buf, rpc.result.len);
 792         strbuf_release(&rpc.result);
 793         strbuf_release(&preamble);
 794         free(depth_arg);
 795         return err;
 796 }
 797
 798 static int fetch(int nr_heads, struct ref **to_fetch)
 799 {
 800         struct discovery *d = discover_refs("git-upload-pack", 0);
 801         if (d->proto_git)
 802                 return fetch_git(d, nr_heads, to_fetch);
 803         else
 804                 return fetch_dumb(nr_heads, to_fetch);
 805 }
 806
 807 static void parse_fetch(struct strbuf *buf)
 808 {
 809         struct ref **to_fetch = NULL;
 810         struct ref *list_head = NULL;
 811         struct ref **list = &list_head;
 812         int alloc_heads = 0, nr_heads = 0;
 813
 814         do {
 815                 const char *p;
 816                 if (skip_prefix(buf->buf, "fetch ", &p)) {
 817                         const char *name;
 818                         struct ref *ref;
 819                         struct object_id old_oid;
 820
 821                         if (get_oid_hex(p, &old_oid))
 822                                 die("protocol error: expected sha/ref, got %s'", p);
 823                         if (p[GIT_SHA1_HEXSZ] == ' ')
 824                                 name = p + GIT_SHA1_HEXSZ + 1;
 825                         else if (!p[GIT_SHA1_HEXSZ])
 826                                 name = "";
 827                         else
 828                                 die("protocol error: expected sha/ref, got %s'", p);
 829
 830                         ref = alloc_ref(name);
 831                         oidcpy(&ref->old_oid, &old_oid);
 832
 833                         *list = ref;
 834                         list = &ref->next;
 835
 836                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 837                         to_fetch[nr_heads++] = ref;
 838                 }
 839                 else
 840                         die("http transport does not support %s", buf->buf);
 841
 842                 strbuf_reset(buf);
 843                 if (strbuf_getline_lf(buf, stdin) == EOF)
 844                         return;
 845                 if (!*buf->buf)
 846                         break;
 847         } while (1);
 848
 849         if (fetch(nr_heads, to_fetch))
 850                 exit(128); /* error already reported */
 851         free_refs(list_head);
 852         free(to_fetch);
 853
 854         printf("\n");
 855         fflush(stdout);
 856         strbuf_reset(buf);
 857 }
 858
 859 static int push_dav(int nr_spec, char **specs)
 860 {
 861         const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 862         int argc = 0, i;
 863
 864         argv[argc++] = "http-push";
 865         argv[argc++] = "--helper-status";
 866         if (options.dry_run)
 867                 argv[argc++] = "--dry-run";
 868         if (options.verbosity > 1)
 869                 argv[argc++] = "--verbose";
 870         argv[argc++] = url.buf;
 871         for (i = 0; i < nr_spec; i++)
 872                 argv[argc++] = specs[i];
 873         argv[argc++] = NULL;
 874
 875         if (run_command_v_opt(argv, RUN_GIT_CMD))
 876                 die("git-%s failed", argv[0]);
 877         free(argv);
 878         return 0;
 879 }
 880
 881 static int push_git(struct discovery *heads, int nr_spec, char **specs)
 882 {
 883         struct rpc_state rpc;
 884         int i, err;
 885         struct argv_array args;
 886         struct string_list_item *cas_option;
 887         struct strbuf preamble = STRBUF_INIT;
 888
 889         argv_array_init(&args);
 890         argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 891                          NULL);
 892
 893         if (options.thin)
 894                 argv_array_push(&args, "--thin");
 895         if (options.dry_run)
 896                 argv_array_push(&args, "--dry-run");
 897         if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
 898                 argv_array_push(&args, "--signed=yes");
 899         else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
 900                 argv_array_push(&args, "--signed=if-asked");
 901         if (options.verbosity == 0)
 902                 argv_array_push(&args, "--quiet");
 903         else if (options.verbosity > 1)
 904                 argv_array_push(&args, "--verbose");
 905         argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 906         for_each_string_list_item(cas_option, &cas_options)
 907                 argv_array_push(&args, cas_option->string);
 908         argv_array_push(&args, url.buf);
 909
 910         argv_array_push(&args, "--stdin");
 911         for (i = 0; i < nr_spec; i++)
 912                 packet_buf_write(&preamble, "%s\n", specs[i]);
 913         packet_buf_flush(&preamble);
 914
 915         memset(&rpc, 0, sizeof(rpc));
 916         rpc.service_name = "git-receive-pack",
 917         rpc.argv = args.argv;
 918         rpc.stdin_preamble = &preamble;
 919
 920         err = rpc_service(&rpc, heads);
 921         if (rpc.result.len)
 922                 write_or_die(1, rpc.result.buf, rpc.result.len);
 923         strbuf_release(&rpc.result);
 924         strbuf_release(&preamble);
 925         argv_array_clear(&args);
 926         return err;
 927 }
 928
 929 static int push(int nr_spec, char **specs)
 930 {
 931         struct discovery *heads = discover_refs("git-receive-pack", 1);
 932         int ret;
 933
 934         if (heads->proto_git)
 935                 ret = push_git(heads, nr_spec, specs);
 936         else
 937                 ret = push_dav(nr_spec, specs);
 938         free_discovery(heads);
 939         return ret;
 940 }
 941
 942 static void parse_push(struct strbuf *buf)
 943 {
 944         char **specs = NULL;
 945         int alloc_spec = 0, nr_spec = 0, i, ret;
 946
 947         do {
 948                 if (starts_with(buf->buf, "push ")) {
 949                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 950                         specs[nr_spec++] = xstrdup(buf->buf + 5);
 951                 }
 952                 else
 953                         die("http transport does not support %s", buf->buf);
 954
 955                 strbuf_reset(buf);
 956                 if (strbuf_getline_lf(buf, stdin) == EOF)
 957                         goto free_specs;
 958                 if (!*buf->buf)
 959                         break;
 960         } while (1);
 961
 962         ret = push(nr_spec, specs);
 963         printf("\n");
 964         fflush(stdout);
 965
 966         if (ret)
 967                 exit(128); /* error already reported */
 968
 969  free_specs:
 970         for (i = 0; i < nr_spec; i++)
 971                 free(specs[i]);
 972         free(specs);
 973 }
 974
 975 int main(int argc, const char **argv)
 976 {
 977         struct strbuf buf = STRBUF_INIT;
 978         int nongit;
 979
 980         git_setup_gettext();
 981
 982         git_extract_argv0_path(argv[0]);
 983         setup_git_directory_gently(&nongit);
 984         if (argc < 2) {
 985                 error("remote-curl: usage: git remote-curl <remote> [<url>]");
 986                 return 1;
 987         }
 988
 989         options.verbosity = 1;
 990         options.progress = !!isatty(2);
 991         options.thin = 1;
 992
 993         remote = remote_get(argv[1]);
 994
 995         if (argc > 2) {
 996                 end_url_with_slash(&url, argv[2]);
 997         } else {
 998                 end_url_with_slash(&url, remote->url[0]);
 999         }
1000
1001         http_init(remote, url.buf, 0);
1002
1003         do {
1004                 const char *arg;
1005
1006                 if (strbuf_getline_lf(&buf, stdin) == EOF) {
1007                         if (ferror(stdin))
1008                                 error("remote-curl: error reading command stream from git");
1009                         return 1;
1010                 }
1011                 if (buf.len == 0)
1012                         break;
1013                 if (starts_with(buf.buf, "fetch ")) {
1014                         if (nongit)
1015                                 die("remote-curl: fetch attempted without a local repo");
1016                         parse_fetch(&buf);
1017
1018                 } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1019                         int for_push = !!strstr(buf.buf + 4, "for-push");
1020                         output_refs(get_refs(for_push));
1021
1022                 } else if (starts_with(buf.buf, "push ")) {
1023                         parse_push(&buf);
1024
1025                 } else if (skip_prefix(buf.buf, "option ", &arg)) {
1026                         char *value = strchr(arg, ' ');
1027                         int result;
1028
1029                         if (value)
1030                                 *value++ = '\0';
1031                         else
1032                                 value = "true";
1033
1034                         result = set_option(arg, value);
1035                         if (!result)
1036                                 printf("ok\n");
1037                         else if (result < 0)
1038                                 printf("error invalid value\n");
1039                         else
1040                                 printf("unsupported\n");
1041                         fflush(stdout);
1042
1043                 } else if (!strcmp(buf.buf, "capabilities")) {
1044                         printf("fetch\n");
1045                         printf("option\n");
1046                         printf("push\n");
1047                         printf("check-connectivity\n");
1048                         printf("\n");
1049                         fflush(stdout);
1050                 } else {
1051                         error("remote-curl: unknown command '%s' from git", buf.buf);
1052                         return 1;
1053                 }
1054                 strbuf_reset(&buf);
1055         } while (1);
1056
1057         http_cleanup();
1058
1059         return 0;
1060 }