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