remote-curl.c

   1 #include "cache.h"
   2 #include "config.h"
   3 #include "remote.h"
   4 #include "strbuf.h"
   5 #include "walker.h"
   6 #include "http.h"
   7 #include "exec_cmd.h"
   8 #include "run-command.h"
   9 #include "pkt-line.h"
  10 #include "string-list.h"
  11 #include "sideband.h"
  12 #include "argv-array.h"
  13 #include "credential.h"
  14 #include "sha1-array.h"
  15 #include "send-pack.h"
  16
  17 static struct remote *remote;
  18 /* always ends with a trailing slash */
  19 static struct strbuf url = STRBUF_INIT;
  20
  21 struct options {
  22         int verbosity;
  23         unsigned long depth;
  24         char *deepen_since;
  25         struct string_list deepen_not;
  26         struct string_list push_options;
  27         unsigned progress : 1,
  28                 check_self_contained_and_connected : 1,
  29                 cloning : 1,
  30                 update_shallow : 1,
  31                 followtags : 1,
  32                 dry_run : 1,
  33                 thin : 1,
  34                 /* One of the SEND_PACK_PUSH_CERT_* constants. */
  35                 push_cert : 2,
  36                 deepen_relative : 1,
  37                 from_promisor : 1,
  38                 no_dependents : 1;
  39 };
  40 static struct options options;
  41 static struct string_list cas_options = STRING_LIST_INIT_DUP;
  42
  43 static int set_option(const char *name, const char *value)
  44 {
  45         if (!strcmp(name, "verbosity")) {
  46                 char *end;
  47                 int v = strtol(value, &end, 10);
  48                 if (value == end || *end)
  49                         return -1;
  50                 options.verbosity = v;
  51                 return 0;
  52         }
  53         else if (!strcmp(name, "progress")) {
  54                 if (!strcmp(value, "true"))
  55                         options.progress = 1;
  56                 else if (!strcmp(value, "false"))
  57                         options.progress = 0;
  58                 else
  59                         return -1;
  60                 return 0;
  61         }
  62         else if (!strcmp(name, "depth")) {
  63                 char *end;
  64                 unsigned long v = strtoul(value, &end, 10);
  65                 if (value == end || *end)
  66                         return -1;
  67                 options.depth = v;
  68                 return 0;
  69         }
  70         else if (!strcmp(name, "deepen-since")) {
  71                 options.deepen_since = xstrdup(value);
  72                 return 0;
  73         }
  74         else if (!strcmp(name, "deepen-not")) {
  75                 string_list_append(&options.deepen_not, value);
  76                 return 0;
  77         }
  78         else if (!strcmp(name, "deepen-relative")) {
  79                 if (!strcmp(value, "true"))
  80                         options.deepen_relative = 1;
  81                 else if (!strcmp(value, "false"))
  82                         options.deepen_relative = 0;
  83                 else
  84                         return -1;
  85                 return 0;
  86         }
  87         else if (!strcmp(name, "followtags")) {
  88                 if (!strcmp(value, "true"))
  89                         options.followtags = 1;
  90                 else if (!strcmp(value, "false"))
  91                         options.followtags = 0;
  92                 else
  93                         return -1;
  94                 return 0;
  95         }
  96         else if (!strcmp(name, "dry-run")) {
  97                 if (!strcmp(value, "true"))
  98                         options.dry_run = 1;
  99                 else if (!strcmp(value, "false"))
 100                         options.dry_run = 0;
 101                 else
 102                         return -1;
 103                 return 0;
 104         }
 105         else if (!strcmp(name, "check-connectivity")) {
 106                 if (!strcmp(value, "true"))
 107                         options.check_self_contained_and_connected = 1;
 108                 else if (!strcmp(value, "false"))
 109                         options.check_self_contained_and_connected = 0;
 110                 else
 111                         return -1;
 112                 return 0;
 113         }
 114         else if (!strcmp(name, "cas")) {
 115                 struct strbuf val = STRBUF_INIT;
 116                 strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
 117                 string_list_append(&cas_options, val.buf);
 118                 strbuf_release(&val);
 119                 return 0;
 120         } else if (!strcmp(name, "cloning")) {
 121                 if (!strcmp(value, "true"))
 122                         options.cloning = 1;
 123                 else if (!strcmp(value, "false"))
 124                         options.cloning = 0;
 125                 else
 126                         return -1;
 127                 return 0;
 128         } else if (!strcmp(name, "update-shallow")) {
 129                 if (!strcmp(value, "true"))
 130                         options.update_shallow = 1;
 131                 else if (!strcmp(value, "false"))
 132                         options.update_shallow = 0;
 133                 else
 134                         return -1;
 135                 return 0;
 136         } else if (!strcmp(name, "pushcert")) {
 137                 if (!strcmp(value, "true"))
 138                         options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 139                 else if (!strcmp(value, "false"))
 140                         options.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 141                 else if (!strcmp(value, "if-asked"))
 142                         options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 143                 else
 144                         return -1;
 145                 return 0;
 146         } else if (!strcmp(name, "push-option")) {
 147                 string_list_append(&options.push_options, value);
 148                 return 0;
 149
 150 #if LIBCURL_VERSION_NUM >= 0x070a08
 151         } else if (!strcmp(name, "family")) {
 152                 if (!strcmp(value, "ipv4"))
 153                         git_curl_ipresolve = CURL_IPRESOLVE_V4;
 154                 else if (!strcmp(value, "ipv6"))
 155                         git_curl_ipresolve = CURL_IPRESOLVE_V6;
 156                 else if (!strcmp(value, "all"))
 157                         git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
 158                 else
 159                         return -1;
 160                 return 0;
 161 #endif /* LIBCURL_VERSION_NUM >= 0x070a08 */
 162         } else if (!strcmp(name, "from-promisor")) {
 163                 options.from_promisor = 1;
 164                 return 0;
 165         } else if (!strcmp(name, "no-dependents")) {
 166                 options.no_dependents = 1;
 167                 return 0;
 168         } else {
 169                 return 1 /* unsupported */;
 170         }
 171 }
 172
 173 struct discovery {
 174         const char *service;
 175         char *buf_alloc;
 176         char *buf;
 177         size_t len;
 178         struct ref *refs;
 179         struct oid_array shallow;
 180         unsigned proto_git : 1;
 181 };
 182 static struct discovery *last_discovery;
 183
 184 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 185 {
 186         struct ref *list = NULL;
 187         get_remote_heads(-1, heads->buf, heads->len, &list,
 188                          for_push ? REF_NORMAL : 0, NULL, &heads->shallow);
 189         return list;
 190 }
 191
 192 static struct ref *parse_info_refs(struct discovery *heads)
 193 {
 194         char *data, *start, *mid;
 195         char *ref_name;
 196         int i = 0;
 197
 198         struct ref *refs = NULL;
 199         struct ref *ref = NULL;
 200         struct ref *last_ref = NULL;
 201
 202         data = heads->buf;
 203         start = NULL;
 204         mid = data;
 205         while (i < heads->len) {
 206                 if (!start) {
 207                         start = &data[i];
 208                 }
 209                 if (data[i] == '\t')
 210                         mid = &data[i];
 211                 if (data[i] == '\n') {
 212                         if (mid - start != 40)
 213                                 die("%sinfo/refs not valid: is this a git repository?",
 214                                     url.buf);
 215                         data[i] = 0;
 216                         ref_name = mid + 1;
 217                         ref = alloc_ref(ref_name);
 218                         get_oid_hex(start, &ref->old_oid);
 219                         if (!refs)
 220                                 refs = ref;
 221                         if (last_ref)
 222                                 last_ref->next = ref;
 223                         last_ref = ref;
 224                         start = NULL;
 225                 }
 226                 i++;
 227         }
 228
 229         ref = alloc_ref("HEAD");
 230         if (!http_fetch_ref(url.buf, ref) &&
 231             !resolve_remote_symref(ref, refs)) {
 232                 ref->next = refs;
 233                 refs = ref;
 234         } else {
 235                 free(ref);
 236         }
 237
 238         return refs;
 239 }
 240
 241 static void free_discovery(struct discovery *d)
 242 {
 243         if (d) {
 244                 if (d == last_discovery)
 245                         last_discovery = NULL;
 246                 free(d->shallow.oid);
 247                 free(d->buf_alloc);
 248                 free_refs(d->refs);
 249                 free(d);
 250         }
 251 }
 252
 253 static int show_http_message(struct strbuf *type, struct strbuf *charset,
 254                              struct strbuf *msg)
 255 {
 256         const char *p, *eol;
 257
 258         /*
 259          * We only show text/plain parts, as other types are likely
 260          * to be ugly to look at on the user's terminal.
 261          */
 262         if (strcmp(type->buf, "text/plain"))
 263                 return -1;
 264         if (charset->len)
 265                 strbuf_reencode(msg, charset->buf, get_log_output_encoding());
 266
 267         strbuf_trim(msg);
 268         if (!msg->len)
 269                 return -1;
 270
 271         p = msg->buf;
 272         do {
 273                 eol = strchrnul(p, '\n');
 274                 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 275                 p = eol + 1;
 276         } while(*eol);
 277         return 0;
 278 }
 279
 280 static struct discovery *discover_refs(const char *service, int for_push)
 281 {
 282         struct strbuf exp = STRBUF_INIT;
 283         struct strbuf type = STRBUF_INIT;
 284         struct strbuf charset = STRBUF_INIT;
 285         struct strbuf buffer = STRBUF_INIT;
 286         struct strbuf refs_url = STRBUF_INIT;
 287         struct strbuf effective_url = STRBUF_INIT;
 288         struct discovery *last = last_discovery;
 289         int http_ret, maybe_smart = 0;
 290         struct http_get_options http_options;
 291
 292         if (last && !strcmp(service, last->service))
 293                 return last;
 294         free_discovery(last);
 295
 296         strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 297         if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 298              git_env_bool("GIT_SMART_HTTP", 1)) {
 299                 maybe_smart = 1;
 300                 if (!strchr(url.buf, '?'))
 301                         strbuf_addch(&refs_url, '?');
 302                 else
 303                         strbuf_addch(&refs_url, '&');
 304                 strbuf_addf(&refs_url, "service=%s", service);
 305         }
 306
 307         memset(&http_options, 0, sizeof(http_options));
 308         http_options.content_type = &type;
 309         http_options.charset = &charset;
 310         http_options.effective_url = &effective_url;
 311         http_options.base_url = &url;
 312         http_options.initial_request = 1;
 313         http_options.no_cache = 1;
 314         http_options.keep_error = 1;
 315
 316         http_ret = http_get_strbuf(refs_url.buf, &buffer, &http_options);
 317         switch (http_ret) {
 318         case HTTP_OK:
 319                 break;
 320         case HTTP_MISSING_TARGET:
 321                 show_http_message(&type, &charset, &buffer);
 322                 die("repository '%s' not found", url.buf);
 323         case HTTP_NOAUTH:
 324                 show_http_message(&type, &charset, &buffer);
 325                 die("Authentication failed for '%s'", url.buf);
 326         default:
 327                 show_http_message(&type, &charset, &buffer);
 328                 die("unable to access '%s': %s", url.buf, curl_errorstr);
 329         }
 330
 331         if (options.verbosity && !starts_with(refs_url.buf, url.buf))
 332                 warning(_("redirecting to %s"), url.buf);
 333
 334         last= xcalloc(1, sizeof(*last_discovery));
 335         last->service = service;
 336         last->buf_alloc = strbuf_detach(&buffer, &last->len);
 337         last->buf = last->buf_alloc;
 338
 339         strbuf_addf(&exp, "application/x-%s-advertisement", service);
 340         if (maybe_smart &&
 341             (5 <= last->len && last->buf[4] == '#') &&
 342             !strbuf_cmp(&exp, &type)) {
 343                 char *line;
 344
 345                 /*
 346                  * smart HTTP response; validate that the service
 347                  * pkt-line matches our request.
 348                  */
 349                 line = packet_read_line_buf(&last->buf, &last->len, NULL);
 350
 351                 strbuf_reset(&exp);
 352                 strbuf_addf(&exp, "# service=%s", service);
 353                 if (strcmp(line, exp.buf))
 354                         die("invalid server response; got '%s'", line);
 355                 strbuf_release(&exp);
 356
 357                 /* The header can include additional metadata lines, up
 358                  * until a packet flush marker.  Ignore these now, but
 359                  * in the future we might start to scan them.
 360                  */
 361                 while (packet_read_line_buf(&last->buf, &last->len, NULL))
 362                         ;
 363
 364                 last->proto_git = 1;
 365         }
 366
 367         if (last->proto_git)
 368                 last->refs = parse_git_refs(last, for_push);
 369         else
 370                 last->refs = parse_info_refs(last);
 371
 372         strbuf_release(&refs_url);
 373         strbuf_release(&exp);
 374         strbuf_release(&type);
 375         strbuf_release(&charset);
 376         strbuf_release(&effective_url);
 377         strbuf_release(&buffer);
 378         last_discovery = last;
 379         return last;
 380 }
 381
 382 static struct ref *get_refs(int for_push)
 383 {
 384         struct discovery *heads;
 385
 386         if (for_push)
 387                 heads = discover_refs("git-receive-pack", for_push);
 388         else
 389                 heads = discover_refs("git-upload-pack", for_push);
 390
 391         return heads->refs;
 392 }
 393
 394 static void output_refs(struct ref *refs)
 395 {
 396         struct ref *posn;
 397         for (posn = refs; posn; posn = posn->next) {
 398                 if (posn->symref)
 399                         printf("@%s %s\n", posn->symref, posn->name);
 400                 else
 401                         printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name);
 402         }
 403         printf("\n");
 404         fflush(stdout);
 405 }
 406
 407 struct rpc_state {
 408         const char *service_name;
 409         const char **argv;
 410         struct strbuf *stdin_preamble;
 411         char *service_url;
 412         char *hdr_content_type;
 413         char *hdr_accept;
 414         char *buf;
 415         size_t alloc;
 416         size_t len;
 417         size_t pos;
 418         int in;
 419         int out;
 420         int any_written;
 421         struct strbuf result;
 422         unsigned gzip_request : 1;
 423         unsigned initial_buffer : 1;
 424 };
 425
 426 static size_t rpc_out(void *ptr, size_t eltsize,
 427                 size_t nmemb, void *buffer_)
 428 {
 429         size_t max = eltsize * nmemb;
 430         struct rpc_state *rpc = buffer_;
 431         size_t avail = rpc->len - rpc->pos;
 432
 433         if (!avail) {
 434                 rpc->initial_buffer = 0;
 435                 avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 436                 if (!avail)
 437                         return 0;
 438                 rpc->pos = 0;
 439                 rpc->len = avail;
 440         }
 441
 442         if (max < avail)
 443                 avail = max;
 444         memcpy(ptr, rpc->buf + rpc->pos, avail);
 445         rpc->pos += avail;
 446         return avail;
 447 }
 448
 449 #ifndef NO_CURL_IOCTL
 450 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 451 {
 452         struct rpc_state *rpc = clientp;
 453
 454         switch (cmd) {
 455         case CURLIOCMD_NOP:
 456                 return CURLIOE_OK;
 457
 458         case CURLIOCMD_RESTARTREAD:
 459                 if (rpc->initial_buffer) {
 460                         rpc->pos = 0;
 461                         return CURLIOE_OK;
 462                 }
 463                 error("unable to rewind rpc post data - try increasing http.postBuffer");
 464                 return CURLIOE_FAILRESTART;
 465
 466         default:
 467                 return CURLIOE_UNKNOWNCMD;
 468         }
 469 }
 470 #endif
 471
 472 static size_t rpc_in(char *ptr, size_t eltsize,
 473                 size_t nmemb, void *buffer_)
 474 {
 475         size_t size = eltsize * nmemb;
 476         struct rpc_state *rpc = buffer_;
 477         if (size)
 478                 rpc->any_written = 1;
 479         write_or_die(rpc->in, ptr, size);
 480         return size;
 481 }
 482
 483 static int run_slot(struct active_request_slot *slot,
 484                     struct slot_results *results)
 485 {
 486         int err;
 487         struct slot_results results_buf;
 488
 489         if (!results)
 490                 results = &results_buf;
 491
 492         err = run_one_slot(slot, results);
 493
 494         if (err != HTTP_OK && err != HTTP_REAUTH) {
 495                 struct strbuf msg = STRBUF_INIT;
 496                 if (results->http_code && results->http_code != 200)
 497                         strbuf_addf(&msg, "HTTP %ld", results->http_code);
 498                 if (results->curl_result != CURLE_OK) {
 499                         if (msg.len)
 500                                 strbuf_addch(&msg, ' ');
 501                         strbuf_addf(&msg, "curl %d", results->curl_result);
 502                         if (curl_errorstr[0]) {
 503                                 strbuf_addch(&msg, ' ');
 504                                 strbuf_addstr(&msg, curl_errorstr);
 505                         }
 506                 }
 507                 error("RPC failed; %s", msg.buf);
 508                 strbuf_release(&msg);
 509         }
 510
 511         return err;
 512 }
 513
 514 static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 515 {
 516         struct active_request_slot *slot;
 517         struct curl_slist *headers = http_copy_default_headers();
 518         struct strbuf buf = STRBUF_INIT;
 519         int err;
 520
 521         slot = get_active_slot();
 522
 523         headers = curl_slist_append(headers, rpc->hdr_content_type);
 524         headers = curl_slist_append(headers, rpc->hdr_accept);
 525
 526         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 527         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 528         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 529         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 530         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 531         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 532         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 533         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 534         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 535
 536         err = run_slot(slot, results);
 537
 538         curl_slist_free_all(headers);
 539         strbuf_release(&buf);
 540         return err;
 541 }
 542
 543 static curl_off_t xcurl_off_t(ssize_t len) {
 544         if (len > maximum_signed_value_of_type(curl_off_t))
 545                 die("cannot handle pushes this big");
 546         return (curl_off_t) len;
 547 }
 548
 549 static int post_rpc(struct rpc_state *rpc)
 550 {
 551         struct active_request_slot *slot;
 552         struct curl_slist *headers = http_copy_default_headers();
 553         int use_gzip = rpc->gzip_request;
 554         char *gzip_body = NULL;
 555         size_t gzip_size = 0;
 556         int err, large_request = 0;
 557         int needs_100_continue = 0;
 558
 559         /* Try to load the entire request, if we can fit it into the
 560          * allocated buffer space we can use HTTP/1.0 and avoid the
 561          * chunked encoding mess.
 562          */
 563         while (1) {
 564                 size_t left = rpc->alloc - rpc->len;
 565                 char *buf = rpc->buf + rpc->len;
 566                 int n;
 567
 568                 if (left < LARGE_PACKET_MAX) {
 569                         large_request = 1;
 570                         use_gzip = 0;
 571                         break;
 572                 }
 573
 574                 n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 575                 if (!n)
 576                         break;
 577                 rpc->len += n;
 578         }
 579
 580         if (large_request) {
 581                 struct slot_results results;
 582
 583                 do {
 584                         err = probe_rpc(rpc, &results);
 585                         if (err == HTTP_REAUTH)
 586                                 credential_fill(&http_auth);
 587                 } while (err == HTTP_REAUTH);
 588                 if (err != HTTP_OK)
 589                         return -1;
 590
 591                 if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 592                         needs_100_continue = 1;
 593         }
 594
 595         headers = curl_slist_append(headers, rpc->hdr_content_type);
 596         headers = curl_slist_append(headers, rpc->hdr_accept);
 597         headers = curl_slist_append(headers, needs_100_continue ?
 598                 "Expect: 100-continue" : "Expect:");
 599
 600 retry:
 601         slot = get_active_slot();
 602
 603         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 604         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 605         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 606         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 607
 608         if (large_request) {
 609                 /* The request body is large and the size cannot be predicted.
 610                  * We must use chunked encoding to send it.
 611                  */
 612                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 613                 rpc->initial_buffer = 1;
 614                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 615                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 616 #ifndef NO_CURL_IOCTL
 617                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 618                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 619 #endif
 620                 if (options.verbosity > 1) {
 621                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 622                         fflush(stderr);
 623                 }
 624
 625         } else if (gzip_body) {
 626                 /*
 627                  * If we are looping to retry authentication, then the previous
 628                  * run will have set up the headers and gzip buffer already,
 629                  * and we just need to send it.
 630                  */
 631                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 632                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 633
 634         } else if (use_gzip && 1024 < rpc->len) {
 635                 /* The client backend isn't giving us compressed data so
 636                  * we can try to deflate it ourselves, this may save on.
 637                  * the transfer time.
 638                  */
 639                 git_zstream stream;
 640                 int ret;
 641
 642                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 643                 gzip_size = git_deflate_bound(&stream, rpc->len);
 644                 gzip_body = xmalloc(gzip_size);
 645
 646                 stream.next_in = (unsigned char *)rpc->buf;
 647                 stream.avail_in = rpc->len;
 648                 stream.next_out = (unsigned char *)gzip_body;
 649                 stream.avail_out = gzip_size;
 650
 651                 ret = git_deflate(&stream, Z_FINISH);
 652                 if (ret != Z_STREAM_END)
 653                         die("cannot deflate request; zlib deflate error %d", ret);
 654
 655                 ret = git_deflate_end_gently(&stream);
 656                 if (ret != Z_OK)
 657                         die("cannot deflate request; zlib end error %d", ret);
 658
 659                 gzip_size = stream.total_out;
 660
 661                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 662                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 663                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 664
 665                 if (options.verbosity > 1) {
 666                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 667                                 rpc->service_name,
 668                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
 669                         fflush(stderr);
 670                 }
 671         } else {
 672                 /* We know the complete request size in advance, use the
 673                  * more normal Content-Length approach.
 674                  */
 675                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 676                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(rpc->len));
 677                 if (options.verbosity > 1) {
 678                         fprintf(stderr, "POST %s (%lu bytes)\n",
 679                                 rpc->service_name, (unsigned long)rpc->len);
 680                         fflush(stderr);
 681                 }
 682         }
 683
 684         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 685         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 686         curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 687
 688
 689         rpc->any_written = 0;
 690         err = run_slot(slot, NULL);
 691         if (err == HTTP_REAUTH && !large_request) {
 692                 credential_fill(&http_auth);
 693                 goto retry;
 694         }
 695         if (err != HTTP_OK)
 696                 err = -1;
 697
 698         if (!rpc->any_written)
 699                 err = -1;
 700
 701         curl_slist_free_all(headers);
 702         free(gzip_body);
 703         return err;
 704 }
 705
 706 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 707 {
 708         const char *svc = rpc->service_name;
 709         struct strbuf buf = STRBUF_INIT;
 710         struct strbuf *preamble = rpc->stdin_preamble;
 711         struct child_process client = CHILD_PROCESS_INIT;
 712         int err = 0;
 713
 714         client.in = -1;
 715         client.out = -1;
 716         client.git_cmd = 1;
 717         client.argv = rpc->argv;
 718         if (start_command(&client))
 719                 exit(1);
 720         if (preamble)
 721                 write_or_die(client.in, preamble->buf, preamble->len);
 722         if (heads)
 723                 write_or_die(client.in, heads->buf, heads->len);
 724
 725         rpc->alloc = http_post_buffer;
 726         rpc->buf = xmalloc(rpc->alloc);
 727         rpc->in = client.in;
 728         rpc->out = client.out;
 729         strbuf_init(&rpc->result, 0);
 730
 731         strbuf_addf(&buf, "%s%s", url.buf, svc);
 732         rpc->service_url = strbuf_detach(&buf, NULL);
 733
 734         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 735         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 736
 737         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 738         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 739
 740         while (!err) {
 741                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 742                 if (!n)
 743                         break;
 744                 rpc->pos = 0;
 745                 rpc->len = n;
 746                 err |= post_rpc(rpc);
 747         }
 748
 749         close(client.in);
 750         client.in = -1;
 751         if (!err) {
 752                 strbuf_read(&rpc->result, client.out, 0);
 753         } else {
 754                 char buf[4096];
 755                 for (;;)
 756                         if (xread(client.out, buf, sizeof(buf)) <= 0)
 757                                 break;
 758         }
 759
 760         close(client.out);
 761         client.out = -1;
 762
 763         err |= finish_command(&client);
 764         free(rpc->service_url);
 765         free(rpc->hdr_content_type);
 766         free(rpc->hdr_accept);
 767         free(rpc->buf);
 768         strbuf_release(&buf);
 769         return err;
 770 }
 771
 772 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 773 {
 774         struct walker *walker;
 775         char **targets;
 776         int ret, i;
 777
 778         ALLOC_ARRAY(targets, nr_heads);
 779         if (options.depth || options.deepen_since)
 780                 die("dumb http transport does not support shallow capabilities");
 781         for (i = 0; i < nr_heads; i++)
 782                 targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
 783
 784         walker = get_http_walker(url.buf);
 785         walker->get_all = 1;
 786         walker->get_tree = 1;
 787         walker->get_history = 1;
 788         walker->get_verbosely = options.verbosity >= 3;
 789         walker->get_recover = 0;
 790         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 791         walker_free(walker);
 792
 793         for (i = 0; i < nr_heads; i++)
 794                 free(targets[i]);
 795         free(targets);
 796
 797         return ret ? error("fetch failed.") : 0;
 798 }
 799
 800 static int fetch_git(struct discovery *heads,
 801         int nr_heads, struct ref **to_fetch)
 802 {
 803         struct rpc_state rpc;
 804         struct strbuf preamble = STRBUF_INIT;
 805         int i, err;
 806         struct argv_array args = ARGV_ARRAY_INIT;
 807
 808         argv_array_pushl(&args, "fetch-pack", "--stateless-rpc",
 809                          "--stdin", "--lock-pack", NULL);
 810         if (options.followtags)
 811                 argv_array_push(&args, "--include-tag");
 812         if (options.thin)
 813                 argv_array_push(&args, "--thin");
 814         if (options.verbosity >= 3)
 815                 argv_array_pushl(&args, "-v", "-v", NULL);
 816         if (options.check_self_contained_and_connected)
 817                 argv_array_push(&args, "--check-self-contained-and-connected");
 818         if (options.cloning)
 819                 argv_array_push(&args, "--cloning");
 820         if (options.update_shallow)
 821                 argv_array_push(&args, "--update-shallow");
 822         if (!options.progress)
 823                 argv_array_push(&args, "--no-progress");
 824         if (options.depth)
 825                 argv_array_pushf(&args, "--depth=%lu", options.depth);
 826         if (options.deepen_since)
 827                 argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since);
 828         for (i = 0; i < options.deepen_not.nr; i++)
 829                 argv_array_pushf(&args, "--shallow-exclude=%s",
 830                                  options.deepen_not.items[i].string);
 831         if (options.deepen_relative && options.depth)
 832                 argv_array_push(&args, "--deepen-relative");
 833         if (options.from_promisor)
 834                 argv_array_push(&args, "--from-promisor");
 835         if (options.no_dependents)
 836                 argv_array_push(&args, "--no-dependents");
 837         argv_array_push(&args, url.buf);
 838
 839         for (i = 0; i < nr_heads; i++) {
 840                 struct ref *ref = to_fetch[i];
 841                 if (!*ref->name)
 842                         die("cannot fetch by sha1 over smart http");
 843                 packet_buf_write(&preamble, "%s %s\n",
 844                                  oid_to_hex(&ref->old_oid), ref->name);
 845         }
 846         packet_buf_flush(&preamble);
 847
 848         memset(&rpc, 0, sizeof(rpc));
 849         rpc.service_name = "git-upload-pack",
 850         rpc.argv = args.argv;
 851         rpc.stdin_preamble = &preamble;
 852         rpc.gzip_request = 1;
 853
 854         err = rpc_service(&rpc, heads);
 855         if (rpc.result.len)
 856                 write_or_die(1, rpc.result.buf, rpc.result.len);
 857         strbuf_release(&rpc.result);
 858         strbuf_release(&preamble);
 859         argv_array_clear(&args);
 860         return err;
 861 }
 862
 863 static int fetch(int nr_heads, struct ref **to_fetch)
 864 {
 865         struct discovery *d = discover_refs("git-upload-pack", 0);
 866         if (d->proto_git)
 867                 return fetch_git(d, nr_heads, to_fetch);
 868         else
 869                 return fetch_dumb(nr_heads, to_fetch);
 870 }
 871
 872 static void parse_fetch(struct strbuf *buf)
 873 {
 874         struct ref **to_fetch = NULL;
 875         struct ref *list_head = NULL;
 876         struct ref **list = &list_head;
 877         int alloc_heads = 0, nr_heads = 0;
 878
 879         do {
 880                 const char *p;
 881                 if (skip_prefix(buf->buf, "fetch ", &p)) {
 882                         const char *name;
 883                         struct ref *ref;
 884                         struct object_id old_oid;
 885
 886                         if (get_oid_hex(p, &old_oid))
 887                                 die("protocol error: expected sha/ref, got %s'", p);
 888                         if (p[GIT_SHA1_HEXSZ] == ' ')
 889                                 name = p + GIT_SHA1_HEXSZ + 1;
 890                         else if (!p[GIT_SHA1_HEXSZ])
 891                                 name = "";
 892                         else
 893                                 die("protocol error: expected sha/ref, got %s'", p);
 894
 895                         ref = alloc_ref(name);
 896                         oidcpy(&ref->old_oid, &old_oid);
 897
 898                         *list = ref;
 899                         list = &ref->next;
 900
 901                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 902                         to_fetch[nr_heads++] = ref;
 903                 }
 904                 else
 905                         die("http transport does not support %s", buf->buf);
 906
 907                 strbuf_reset(buf);
 908                 if (strbuf_getline_lf(buf, stdin) == EOF)
 909                         return;
 910                 if (!*buf->buf)
 911                         break;
 912         } while (1);
 913
 914         if (fetch(nr_heads, to_fetch))
 915                 exit(128); /* error already reported */
 916         free_refs(list_head);
 917         free(to_fetch);
 918
 919         printf("\n");
 920         fflush(stdout);
 921         strbuf_reset(buf);
 922 }
 923
 924 static int push_dav(int nr_spec, char **specs)
 925 {
 926         struct child_process child = CHILD_PROCESS_INIT;
 927         size_t i;
 928
 929         child.git_cmd = 1;
 930         argv_array_push(&child.args, "http-push");
 931         argv_array_push(&child.args, "--helper-status");
 932         if (options.dry_run)
 933                 argv_array_push(&child.args, "--dry-run");
 934         if (options.verbosity > 1)
 935                 argv_array_push(&child.args, "--verbose");
 936         argv_array_push(&child.args, url.buf);
 937         for (i = 0; i < nr_spec; i++)
 938                 argv_array_push(&child.args, specs[i]);
 939
 940         if (run_command(&child))
 941                 die("git-http-push failed");
 942         return 0;
 943 }
 944
 945 static int push_git(struct discovery *heads, int nr_spec, char **specs)
 946 {
 947         struct rpc_state rpc;
 948         int i, err;
 949         struct argv_array args;
 950         struct string_list_item *cas_option;
 951         struct strbuf preamble = STRBUF_INIT;
 952
 953         argv_array_init(&args);
 954         argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 955                          NULL);
 956
 957         if (options.thin)
 958                 argv_array_push(&args, "--thin");
 959         if (options.dry_run)
 960                 argv_array_push(&args, "--dry-run");
 961         if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
 962                 argv_array_push(&args, "--signed=yes");
 963         else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
 964                 argv_array_push(&args, "--signed=if-asked");
 965         if (options.verbosity == 0)
 966                 argv_array_push(&args, "--quiet");
 967         else if (options.verbosity > 1)
 968                 argv_array_push(&args, "--verbose");
 969         for (i = 0; i < options.push_options.nr; i++)
 970                 argv_array_pushf(&args, "--push-option=%s",
 971                                  options.push_options.items[i].string);
 972         argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 973         for_each_string_list_item(cas_option, &cas_options)
 974                 argv_array_push(&args, cas_option->string);
 975         argv_array_push(&args, url.buf);
 976
 977         argv_array_push(&args, "--stdin");
 978         for (i = 0; i < nr_spec; i++)
 979                 packet_buf_write(&preamble, "%s\n", specs[i]);
 980         packet_buf_flush(&preamble);
 981
 982         memset(&rpc, 0, sizeof(rpc));
 983         rpc.service_name = "git-receive-pack",
 984         rpc.argv = args.argv;
 985         rpc.stdin_preamble = &preamble;
 986
 987         err = rpc_service(&rpc, heads);
 988         if (rpc.result.len)
 989                 write_or_die(1, rpc.result.buf, rpc.result.len);
 990         strbuf_release(&rpc.result);
 991         strbuf_release(&preamble);
 992         argv_array_clear(&args);
 993         return err;
 994 }
 995
 996 static int push(int nr_spec, char **specs)
 997 {
 998         struct discovery *heads = discover_refs("git-receive-pack", 1);
 999         int ret;
1000
1001         if (heads->proto_git)
1002                 ret = push_git(heads, nr_spec, specs);
1003         else
1004                 ret = push_dav(nr_spec, specs);
1005         free_discovery(heads);
1006         return ret;
1007 }
1008
1009 static void parse_push(struct strbuf *buf)
1010 {
1011         char **specs = NULL;
1012         int alloc_spec = 0, nr_spec = 0, i, ret;
1013
1014         do {
1015                 if (starts_with(buf->buf, "push ")) {
1016                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
1017                         specs[nr_spec++] = xstrdup(buf->buf + 5);
1018                 }
1019                 else
1020                         die("http transport does not support %s", buf->buf);
1021
1022                 strbuf_reset(buf);
1023                 if (strbuf_getline_lf(buf, stdin) == EOF)
1024                         goto free_specs;
1025                 if (!*buf->buf)
1026                         break;
1027         } while (1);
1028
1029         ret = push(nr_spec, specs);
1030         printf("\n");
1031         fflush(stdout);
1032
1033         if (ret)
1034                 exit(128); /* error already reported */
1035
1036  free_specs:
1037         for (i = 0; i < nr_spec; i++)
1038                 free(specs[i]);
1039         free(specs);
1040 }
1041
1042 int cmd_main(int argc, const char **argv)
1043 {
1044         struct strbuf buf = STRBUF_INIT;
1045         int nongit;
1046
1047         setup_git_directory_gently(&nongit);
1048         if (argc < 2) {
1049                 error("remote-curl: usage: git remote-curl <remote> [<url>]");
1050                 return 1;
1051         }
1052
1053         options.verbosity = 1;
1054         options.progress = !!isatty(2);
1055         options.thin = 1;
1056         string_list_init(&options.deepen_not, 1);
1057         string_list_init(&options.push_options, 1);
1058
1059         remote = remote_get(argv[1]);
1060
1061         if (argc > 2) {
1062                 end_url_with_slash(&url, argv[2]);
1063         } else {
1064                 end_url_with_slash(&url, remote->url[0]);
1065         }
1066
1067         http_init(remote, url.buf, 0);
1068
1069         do {
1070                 const char *arg;
1071
1072                 if (strbuf_getline_lf(&buf, stdin) == EOF) {
1073                         if (ferror(stdin))
1074                                 error("remote-curl: error reading command stream from git");
1075                         return 1;
1076                 }
1077                 if (buf.len == 0)
1078                         break;
1079                 if (starts_with(buf.buf, "fetch ")) {
1080                         if (nongit)
1081                                 die("remote-curl: fetch attempted without a local repo");
1082                         parse_fetch(&buf);
1083
1084                 } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1085                         int for_push = !!strstr(buf.buf + 4, "for-push");
1086                         output_refs(get_refs(for_push));
1087
1088                 } else if (starts_with(buf.buf, "push ")) {
1089                         parse_push(&buf);
1090
1091                 } else if (skip_prefix(buf.buf, "option ", &arg)) {
1092                         char *value = strchr(arg, ' ');
1093                         int result;
1094
1095                         if (value)
1096                                 *value++ = '\0';
1097                         else
1098                                 value = "true";
1099
1100                         result = set_option(arg, value);
1101                         if (!result)
1102                                 printf("ok\n");
1103                         else if (result < 0)
1104                                 printf("error invalid value\n");
1105                         else
1106                                 printf("unsupported\n");
1107                         fflush(stdout);
1108
1109                 } else if (!strcmp(buf.buf, "capabilities")) {
1110                         printf("fetch\n");
1111                         printf("option\n");
1112                         printf("push\n");
1113                         printf("check-connectivity\n");
1114                         printf("\n");
1115                         fflush(stdout);
1116                 } else {
1117                         error("remote-curl: unknown command '%s' from git", buf.buf);
1118                         return 1;
1119                 }
1120                 strbuf_reset(&buf);
1121         } while (1);
1122
1123         http_cleanup();
1124
1125         return 0;
1126 }