remote-curl.c

   1 #include "cache.h"
   2 #include "config.h"
   3 #include "remote.h"
   4 #include "connect.h"
   5 #include "strbuf.h"
   6 #include "walker.h"
   7 #include "http.h"
   8 #include "exec_cmd.h"
   9 #include "run-command.h"
  10 #include "pkt-line.h"
  11 #include "string-list.h"
  12 #include "sideband.h"
  13 #include "argv-array.h"
  14 #include "credential.h"
  15 #include "sha1-array.h"
  16 #include "send-pack.h"
  17 #include "protocol.h"
  18
  19 static struct remote *remote;
  20 /* always ends with a trailing slash */
  21 static struct strbuf url = STRBUF_INIT;
  22
  23 struct options {
  24         int verbosity;
  25         unsigned long depth;
  26         char *deepen_since;
  27         struct string_list deepen_not;
  28         struct string_list push_options;
  29         unsigned progress : 1,
  30                 check_self_contained_and_connected : 1,
  31                 cloning : 1,
  32                 update_shallow : 1,
  33                 followtags : 1,
  34                 dry_run : 1,
  35                 thin : 1,
  36                 /* One of the SEND_PACK_PUSH_CERT_* constants. */
  37                 push_cert : 2,
  38                 deepen_relative : 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 {
 163                 return 1 /* unsupported */;
 164         }
 165 }
 166
 167 struct discovery {
 168         const char *service;
 169         char *buf_alloc;
 170         char *buf;
 171         size_t len;
 172         struct ref *refs;
 173         struct oid_array shallow;
 174         unsigned proto_git : 1;
 175 };
 176 static struct discovery *last_discovery;
 177
 178 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 179 {
 180         struct ref *list = NULL;
 181         struct packet_reader reader;
 182
 183         packet_reader_init(&reader, -1, heads->buf, heads->len,
 184                            PACKET_READ_CHOMP_NEWLINE |
 185                            PACKET_READ_GENTLE_ON_EOF);
 186
 187         switch (discover_version(&reader)) {
 188         case protocol_v2:
 189                 die("support for protocol v2 not implemented yet");
 190                 break;
 191         case protocol_v1:
 192         case protocol_v0:
 193                 get_remote_heads(&reader, &list, for_push ? REF_NORMAL : 0,
 194                                  NULL, &heads->shallow);
 195                 break;
 196         case protocol_unknown_version:
 197                 BUG("unknown protocol version");
 198         }
 199
 200         return list;
 201 }
 202
 203 static struct ref *parse_info_refs(struct discovery *heads)
 204 {
 205         char *data, *start, *mid;
 206         char *ref_name;
 207         int i = 0;
 208
 209         struct ref *refs = NULL;
 210         struct ref *ref = NULL;
 211         struct ref *last_ref = NULL;
 212
 213         data = heads->buf;
 214         start = NULL;
 215         mid = data;
 216         while (i < heads->len) {
 217                 if (!start) {
 218                         start = &data[i];
 219                 }
 220                 if (data[i] == '\t')
 221                         mid = &data[i];
 222                 if (data[i] == '\n') {
 223                         if (mid - start != 40)
 224                                 die("%sinfo/refs not valid: is this a git repository?",
 225                                     url.buf);
 226                         data[i] = 0;
 227                         ref_name = mid + 1;
 228                         ref = alloc_ref(ref_name);
 229                         get_oid_hex(start, &ref->old_oid);
 230                         if (!refs)
 231                                 refs = ref;
 232                         if (last_ref)
 233                                 last_ref->next = ref;
 234                         last_ref = ref;
 235                         start = NULL;
 236                 }
 237                 i++;
 238         }
 239
 240         ref = alloc_ref("HEAD");
 241         if (!http_fetch_ref(url.buf, ref) &&
 242             !resolve_remote_symref(ref, refs)) {
 243                 ref->next = refs;
 244                 refs = ref;
 245         } else {
 246                 free(ref);
 247         }
 248
 249         return refs;
 250 }
 251
 252 static void free_discovery(struct discovery *d)
 253 {
 254         if (d) {
 255                 if (d == last_discovery)
 256                         last_discovery = NULL;
 257                 free(d->shallow.oid);
 258                 free(d->buf_alloc);
 259                 free_refs(d->refs);
 260                 free(d);
 261         }
 262 }
 263
 264 static int show_http_message(struct strbuf *type, struct strbuf *charset,
 265                              struct strbuf *msg)
 266 {
 267         const char *p, *eol;
 268
 269         /*
 270          * We only show text/plain parts, as other types are likely
 271          * to be ugly to look at on the user's terminal.
 272          */
 273         if (strcmp(type->buf, "text/plain"))
 274                 return -1;
 275         if (charset->len)
 276                 strbuf_reencode(msg, charset->buf, get_log_output_encoding());
 277
 278         strbuf_trim(msg);
 279         if (!msg->len)
 280                 return -1;
 281
 282         p = msg->buf;
 283         do {
 284                 eol = strchrnul(p, '\n');
 285                 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 286                 p = eol + 1;
 287         } while(*eol);
 288         return 0;
 289 }
 290
 291 static struct discovery *discover_refs(const char *service, int for_push)
 292 {
 293         struct strbuf exp = STRBUF_INIT;
 294         struct strbuf type = STRBUF_INIT;
 295         struct strbuf charset = STRBUF_INIT;
 296         struct strbuf buffer = STRBUF_INIT;
 297         struct strbuf refs_url = STRBUF_INIT;
 298         struct strbuf effective_url = STRBUF_INIT;
 299         struct discovery *last = last_discovery;
 300         int http_ret, maybe_smart = 0;
 301         struct http_get_options http_options;
 302
 303         if (last && !strcmp(service, last->service))
 304                 return last;
 305         free_discovery(last);
 306
 307         strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 308         if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 309              git_env_bool("GIT_SMART_HTTP", 1)) {
 310                 maybe_smart = 1;
 311                 if (!strchr(url.buf, '?'))
 312                         strbuf_addch(&refs_url, '?');
 313                 else
 314                         strbuf_addch(&refs_url, '&');
 315                 strbuf_addf(&refs_url, "service=%s", service);
 316         }
 317
 318         memset(&http_options, 0, sizeof(http_options));
 319         http_options.content_type = &type;
 320         http_options.charset = &charset;
 321         http_options.effective_url = &effective_url;
 322         http_options.base_url = &url;
 323         http_options.initial_request = 1;
 324         http_options.no_cache = 1;
 325         http_options.keep_error = 1;
 326
 327         http_ret = http_get_strbuf(refs_url.buf, &buffer, &http_options);
 328         switch (http_ret) {
 329         case HTTP_OK:
 330                 break;
 331         case HTTP_MISSING_TARGET:
 332                 show_http_message(&type, &charset, &buffer);
 333                 die("repository '%s' not found", url.buf);
 334         case HTTP_NOAUTH:
 335                 show_http_message(&type, &charset, &buffer);
 336                 die("Authentication failed for '%s'", url.buf);
 337         default:
 338                 show_http_message(&type, &charset, &buffer);
 339                 die("unable to access '%s': %s", url.buf, curl_errorstr);
 340         }
 341
 342         if (options.verbosity && !starts_with(refs_url.buf, url.buf))
 343                 warning(_("redirecting to %s"), url.buf);
 344
 345         last= xcalloc(1, sizeof(*last_discovery));
 346         last->service = service;
 347         last->buf_alloc = strbuf_detach(&buffer, &last->len);
 348         last->buf = last->buf_alloc;
 349
 350         strbuf_addf(&exp, "application/x-%s-advertisement", service);
 351         if (maybe_smart &&
 352             (5 <= last->len && last->buf[4] == '#') &&
 353             !strbuf_cmp(&exp, &type)) {
 354                 char *line;
 355
 356                 /*
 357                  * smart HTTP response; validate that the service
 358                  * pkt-line matches our request.
 359                  */
 360                 line = packet_read_line_buf(&last->buf, &last->len, NULL);
 361
 362                 strbuf_reset(&exp);
 363                 strbuf_addf(&exp, "# service=%s", service);
 364                 if (strcmp(line, exp.buf))
 365                         die("invalid server response; got '%s'", line);
 366                 strbuf_release(&exp);
 367
 368                 /* The header can include additional metadata lines, up
 369                  * until a packet flush marker.  Ignore these now, but
 370                  * in the future we might start to scan them.
 371                  */
 372                 while (packet_read_line_buf(&last->buf, &last->len, NULL))
 373                         ;
 374
 375                 last->proto_git = 1;
 376         }
 377
 378         if (last->proto_git)
 379                 last->refs = parse_git_refs(last, for_push);
 380         else
 381                 last->refs = parse_info_refs(last);
 382
 383         strbuf_release(&refs_url);
 384         strbuf_release(&exp);
 385         strbuf_release(&type);
 386         strbuf_release(&charset);
 387         strbuf_release(&effective_url);
 388         strbuf_release(&buffer);
 389         last_discovery = last;
 390         return last;
 391 }
 392
 393 static struct ref *get_refs(int for_push)
 394 {
 395         struct discovery *heads;
 396
 397         if (for_push)
 398                 heads = discover_refs("git-receive-pack", for_push);
 399         else
 400                 heads = discover_refs("git-upload-pack", for_push);
 401
 402         return heads->refs;
 403 }
 404
 405 static void output_refs(struct ref *refs)
 406 {
 407         struct ref *posn;
 408         for (posn = refs; posn; posn = posn->next) {
 409                 if (posn->symref)
 410                         printf("@%s %s\n", posn->symref, posn->name);
 411                 else
 412                         printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name);
 413         }
 414         printf("\n");
 415         fflush(stdout);
 416 }
 417
 418 struct rpc_state {
 419         const char *service_name;
 420         const char **argv;
 421         struct strbuf *stdin_preamble;
 422         char *service_url;
 423         char *hdr_content_type;
 424         char *hdr_accept;
 425         char *buf;
 426         size_t alloc;
 427         size_t len;
 428         size_t pos;
 429         int in;
 430         int out;
 431         int any_written;
 432         struct strbuf result;
 433         unsigned gzip_request : 1;
 434         unsigned initial_buffer : 1;
 435 };
 436
 437 static size_t rpc_out(void *ptr, size_t eltsize,
 438                 size_t nmemb, void *buffer_)
 439 {
 440         size_t max = eltsize * nmemb;
 441         struct rpc_state *rpc = buffer_;
 442         size_t avail = rpc->len - rpc->pos;
 443
 444         if (!avail) {
 445                 rpc->initial_buffer = 0;
 446                 avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 447                 if (!avail)
 448                         return 0;
 449                 rpc->pos = 0;
 450                 rpc->len = avail;
 451         }
 452
 453         if (max < avail)
 454                 avail = max;
 455         memcpy(ptr, rpc->buf + rpc->pos, avail);
 456         rpc->pos += avail;
 457         return avail;
 458 }
 459
 460 #ifndef NO_CURL_IOCTL
 461 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 462 {
 463         struct rpc_state *rpc = clientp;
 464
 465         switch (cmd) {
 466         case CURLIOCMD_NOP:
 467                 return CURLIOE_OK;
 468
 469         case CURLIOCMD_RESTARTREAD:
 470                 if (rpc->initial_buffer) {
 471                         rpc->pos = 0;
 472                         return CURLIOE_OK;
 473                 }
 474                 error("unable to rewind rpc post data - try increasing http.postBuffer");
 475                 return CURLIOE_FAILRESTART;
 476
 477         default:
 478                 return CURLIOE_UNKNOWNCMD;
 479         }
 480 }
 481 #endif
 482
 483 static size_t rpc_in(char *ptr, size_t eltsize,
 484                 size_t nmemb, void *buffer_)
 485 {
 486         size_t size = eltsize * nmemb;
 487         struct rpc_state *rpc = buffer_;
 488         if (size)
 489                 rpc->any_written = 1;
 490         write_or_die(rpc->in, ptr, size);
 491         return size;
 492 }
 493
 494 static int run_slot(struct active_request_slot *slot,
 495                     struct slot_results *results)
 496 {
 497         int err;
 498         struct slot_results results_buf;
 499
 500         if (!results)
 501                 results = &results_buf;
 502
 503         err = run_one_slot(slot, results);
 504
 505         if (err != HTTP_OK && err != HTTP_REAUTH) {
 506                 struct strbuf msg = STRBUF_INIT;
 507                 if (results->http_code && results->http_code != 200)
 508                         strbuf_addf(&msg, "HTTP %ld", results->http_code);
 509                 if (results->curl_result != CURLE_OK) {
 510                         if (msg.len)
 511                                 strbuf_addch(&msg, ' ');
 512                         strbuf_addf(&msg, "curl %d", results->curl_result);
 513                         if (curl_errorstr[0]) {
 514                                 strbuf_addch(&msg, ' ');
 515                                 strbuf_addstr(&msg, curl_errorstr);
 516                         }
 517                 }
 518                 error("RPC failed; %s", msg.buf);
 519                 strbuf_release(&msg);
 520         }
 521
 522         return err;
 523 }
 524
 525 static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 526 {
 527         struct active_request_slot *slot;
 528         struct curl_slist *headers = http_copy_default_headers();
 529         struct strbuf buf = STRBUF_INIT;
 530         int err;
 531
 532         slot = get_active_slot();
 533
 534         headers = curl_slist_append(headers, rpc->hdr_content_type);
 535         headers = curl_slist_append(headers, rpc->hdr_accept);
 536
 537         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 538         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 539         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 540         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 541         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 542         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 543         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 544         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 545         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 546
 547         err = run_slot(slot, results);
 548
 549         curl_slist_free_all(headers);
 550         strbuf_release(&buf);
 551         return err;
 552 }
 553
 554 static curl_off_t xcurl_off_t(ssize_t len) {
 555         if (len > maximum_signed_value_of_type(curl_off_t))
 556                 die("cannot handle pushes this big");
 557         return (curl_off_t) len;
 558 }
 559
 560 static int post_rpc(struct rpc_state *rpc)
 561 {
 562         struct active_request_slot *slot;
 563         struct curl_slist *headers = http_copy_default_headers();
 564         int use_gzip = rpc->gzip_request;
 565         char *gzip_body = NULL;
 566         size_t gzip_size = 0;
 567         int err, large_request = 0;
 568         int needs_100_continue = 0;
 569
 570         /* Try to load the entire request, if we can fit it into the
 571          * allocated buffer space we can use HTTP/1.0 and avoid the
 572          * chunked encoding mess.
 573          */
 574         while (1) {
 575                 size_t left = rpc->alloc - rpc->len;
 576                 char *buf = rpc->buf + rpc->len;
 577                 int n;
 578
 579                 if (left < LARGE_PACKET_MAX) {
 580                         large_request = 1;
 581                         use_gzip = 0;
 582                         break;
 583                 }
 584
 585                 n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 586                 if (!n)
 587                         break;
 588                 rpc->len += n;
 589         }
 590
 591         if (large_request) {
 592                 struct slot_results results;
 593
 594                 do {
 595                         err = probe_rpc(rpc, &results);
 596                         if (err == HTTP_REAUTH)
 597                                 credential_fill(&http_auth);
 598                 } while (err == HTTP_REAUTH);
 599                 if (err != HTTP_OK)
 600                         return -1;
 601
 602                 if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 603                         needs_100_continue = 1;
 604         }
 605
 606         headers = curl_slist_append(headers, rpc->hdr_content_type);
 607         headers = curl_slist_append(headers, rpc->hdr_accept);
 608         headers = curl_slist_append(headers, needs_100_continue ?
 609                 "Expect: 100-continue" : "Expect:");
 610
 611 retry:
 612         slot = get_active_slot();
 613
 614         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 615         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 616         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 617         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 618
 619         if (large_request) {
 620                 /* The request body is large and the size cannot be predicted.
 621                  * We must use chunked encoding to send it.
 622                  */
 623                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 624                 rpc->initial_buffer = 1;
 625                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 626                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 627 #ifndef NO_CURL_IOCTL
 628                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 629                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 630 #endif
 631                 if (options.verbosity > 1) {
 632                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 633                         fflush(stderr);
 634                 }
 635
 636         } else if (gzip_body) {
 637                 /*
 638                  * If we are looping to retry authentication, then the previous
 639                  * run will have set up the headers and gzip buffer already,
 640                  * and we just need to send it.
 641                  */
 642                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 643                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 644
 645         } else if (use_gzip && 1024 < rpc->len) {
 646                 /* The client backend isn't giving us compressed data so
 647                  * we can try to deflate it ourselves, this may save on.
 648                  * the transfer time.
 649                  */
 650                 git_zstream stream;
 651                 int ret;
 652
 653                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 654                 gzip_size = git_deflate_bound(&stream, rpc->len);
 655                 gzip_body = xmalloc(gzip_size);
 656
 657                 stream.next_in = (unsigned char *)rpc->buf;
 658                 stream.avail_in = rpc->len;
 659                 stream.next_out = (unsigned char *)gzip_body;
 660                 stream.avail_out = gzip_size;
 661
 662                 ret = git_deflate(&stream, Z_FINISH);
 663                 if (ret != Z_STREAM_END)
 664                         die("cannot deflate request; zlib deflate error %d", ret);
 665
 666                 ret = git_deflate_end_gently(&stream);
 667                 if (ret != Z_OK)
 668                         die("cannot deflate request; zlib end error %d", ret);
 669
 670                 gzip_size = stream.total_out;
 671
 672                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 673                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 674                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 675
 676                 if (options.verbosity > 1) {
 677                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 678                                 rpc->service_name,
 679                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
 680                         fflush(stderr);
 681                 }
 682         } else {
 683                 /* We know the complete request size in advance, use the
 684                  * more normal Content-Length approach.
 685                  */
 686                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 687                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(rpc->len));
 688                 if (options.verbosity > 1) {
 689                         fprintf(stderr, "POST %s (%lu bytes)\n",
 690                                 rpc->service_name, (unsigned long)rpc->len);
 691                         fflush(stderr);
 692                 }
 693         }
 694
 695         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 696         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 697         curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 698
 699
 700         rpc->any_written = 0;
 701         err = run_slot(slot, NULL);
 702         if (err == HTTP_REAUTH && !large_request) {
 703                 credential_fill(&http_auth);
 704                 goto retry;
 705         }
 706         if (err != HTTP_OK)
 707                 err = -1;
 708
 709         if (!rpc->any_written)
 710                 err = -1;
 711
 712         curl_slist_free_all(headers);
 713         free(gzip_body);
 714         return err;
 715 }
 716
 717 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 718 {
 719         const char *svc = rpc->service_name;
 720         struct strbuf buf = STRBUF_INIT;
 721         struct strbuf *preamble = rpc->stdin_preamble;
 722         struct child_process client = CHILD_PROCESS_INIT;
 723         int err = 0;
 724
 725         client.in = -1;
 726         client.out = -1;
 727         client.git_cmd = 1;
 728         client.argv = rpc->argv;
 729         if (start_command(&client))
 730                 exit(1);
 731         if (preamble)
 732                 write_or_die(client.in, preamble->buf, preamble->len);
 733         if (heads)
 734                 write_or_die(client.in, heads->buf, heads->len);
 735
 736         rpc->alloc = http_post_buffer;
 737         rpc->buf = xmalloc(rpc->alloc);
 738         rpc->in = client.in;
 739         rpc->out = client.out;
 740         strbuf_init(&rpc->result, 0);
 741
 742         strbuf_addf(&buf, "%s%s", url.buf, svc);
 743         rpc->service_url = strbuf_detach(&buf, NULL);
 744
 745         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 746         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 747
 748         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 749         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 750
 751         while (!err) {
 752                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 753                 if (!n)
 754                         break;
 755                 rpc->pos = 0;
 756                 rpc->len = n;
 757                 err |= post_rpc(rpc);
 758         }
 759
 760         close(client.in);
 761         client.in = -1;
 762         if (!err) {
 763                 strbuf_read(&rpc->result, client.out, 0);
 764         } else {
 765                 char buf[4096];
 766                 for (;;)
 767                         if (xread(client.out, buf, sizeof(buf)) <= 0)
 768                                 break;
 769         }
 770
 771         close(client.out);
 772         client.out = -1;
 773
 774         err |= finish_command(&client);
 775         free(rpc->service_url);
 776         free(rpc->hdr_content_type);
 777         free(rpc->hdr_accept);
 778         free(rpc->buf);
 779         strbuf_release(&buf);
 780         return err;
 781 }
 782
 783 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 784 {
 785         struct walker *walker;
 786         char **targets;
 787         int ret, i;
 788
 789         ALLOC_ARRAY(targets, nr_heads);
 790         if (options.depth || options.deepen_since)
 791                 die("dumb http transport does not support shallow capabilities");
 792         for (i = 0; i < nr_heads; i++)
 793                 targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
 794
 795         walker = get_http_walker(url.buf);
 796         walker->get_all = 1;
 797         walker->get_tree = 1;
 798         walker->get_history = 1;
 799         walker->get_verbosely = options.verbosity >= 3;
 800         walker->get_recover = 0;
 801         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 802         walker_free(walker);
 803
 804         for (i = 0; i < nr_heads; i++)
 805                 free(targets[i]);
 806         free(targets);
 807
 808         return ret ? error("fetch failed.") : 0;
 809 }
 810
 811 static int fetch_git(struct discovery *heads,
 812         int nr_heads, struct ref **to_fetch)
 813 {
 814         struct rpc_state rpc;
 815         struct strbuf preamble = STRBUF_INIT;
 816         int i, err;
 817         struct argv_array args = ARGV_ARRAY_INIT;
 818
 819         argv_array_pushl(&args, "fetch-pack", "--stateless-rpc",
 820                          "--stdin", "--lock-pack", NULL);
 821         if (options.followtags)
 822                 argv_array_push(&args, "--include-tag");
 823         if (options.thin)
 824                 argv_array_push(&args, "--thin");
 825         if (options.verbosity >= 3)
 826                 argv_array_pushl(&args, "-v", "-v", NULL);
 827         if (options.check_self_contained_and_connected)
 828                 argv_array_push(&args, "--check-self-contained-and-connected");
 829         if (options.cloning)
 830                 argv_array_push(&args, "--cloning");
 831         if (options.update_shallow)
 832                 argv_array_push(&args, "--update-shallow");
 833         if (!options.progress)
 834                 argv_array_push(&args, "--no-progress");
 835         if (options.depth)
 836                 argv_array_pushf(&args, "--depth=%lu", options.depth);
 837         if (options.deepen_since)
 838                 argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since);
 839         for (i = 0; i < options.deepen_not.nr; i++)
 840                 argv_array_pushf(&args, "--shallow-exclude=%s",
 841                                  options.deepen_not.items[i].string);
 842         if (options.deepen_relative && options.depth)
 843                 argv_array_push(&args, "--deepen-relative");
 844         argv_array_push(&args, url.buf);
 845
 846         for (i = 0; i < nr_heads; i++) {
 847                 struct ref *ref = to_fetch[i];
 848                 if (!*ref->name)
 849                         die("cannot fetch by sha1 over smart http");
 850                 packet_buf_write(&preamble, "%s %s\n",
 851                                  oid_to_hex(&ref->old_oid), ref->name);
 852         }
 853         packet_buf_flush(&preamble);
 854
 855         memset(&rpc, 0, sizeof(rpc));
 856         rpc.service_name = "git-upload-pack",
 857         rpc.argv = args.argv;
 858         rpc.stdin_preamble = &preamble;
 859         rpc.gzip_request = 1;
 860
 861         err = rpc_service(&rpc, heads);
 862         if (rpc.result.len)
 863                 write_or_die(1, rpc.result.buf, rpc.result.len);
 864         strbuf_release(&rpc.result);
 865         strbuf_release(&preamble);
 866         argv_array_clear(&args);
 867         return err;
 868 }
 869
 870 static int fetch(int nr_heads, struct ref **to_fetch)
 871 {
 872         struct discovery *d = discover_refs("git-upload-pack", 0);
 873         if (d->proto_git)
 874                 return fetch_git(d, nr_heads, to_fetch);
 875         else
 876                 return fetch_dumb(nr_heads, to_fetch);
 877 }
 878
 879 static void parse_fetch(struct strbuf *buf)
 880 {
 881         struct ref **to_fetch = NULL;
 882         struct ref *list_head = NULL;
 883         struct ref **list = &list_head;
 884         int alloc_heads = 0, nr_heads = 0;
 885
 886         do {
 887                 const char *p;
 888                 if (skip_prefix(buf->buf, "fetch ", &p)) {
 889                         const char *name;
 890                         struct ref *ref;
 891                         struct object_id old_oid;
 892
 893                         if (get_oid_hex(p, &old_oid))
 894                                 die("protocol error: expected sha/ref, got %s'", p);
 895                         if (p[GIT_SHA1_HEXSZ] == ' ')
 896                                 name = p + GIT_SHA1_HEXSZ + 1;
 897                         else if (!p[GIT_SHA1_HEXSZ])
 898                                 name = "";
 899                         else
 900                                 die("protocol error: expected sha/ref, got %s'", p);
 901
 902                         ref = alloc_ref(name);
 903                         oidcpy(&ref->old_oid, &old_oid);
 904
 905                         *list = ref;
 906                         list = &ref->next;
 907
 908                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 909                         to_fetch[nr_heads++] = ref;
 910                 }
 911                 else
 912                         die("http transport does not support %s", buf->buf);
 913
 914                 strbuf_reset(buf);
 915                 if (strbuf_getline_lf(buf, stdin) == EOF)
 916                         return;
 917                 if (!*buf->buf)
 918                         break;
 919         } while (1);
 920
 921         if (fetch(nr_heads, to_fetch))
 922                 exit(128); /* error already reported */
 923         free_refs(list_head);
 924         free(to_fetch);
 925
 926         printf("\n");
 927         fflush(stdout);
 928         strbuf_reset(buf);
 929 }
 930
 931 static int push_dav(int nr_spec, char **specs)
 932 {
 933         struct child_process child = CHILD_PROCESS_INIT;
 934         size_t i;
 935
 936         child.git_cmd = 1;
 937         argv_array_push(&child.args, "http-push");
 938         argv_array_push(&child.args, "--helper-status");
 939         if (options.dry_run)
 940                 argv_array_push(&child.args, "--dry-run");
 941         if (options.verbosity > 1)
 942                 argv_array_push(&child.args, "--verbose");
 943         argv_array_push(&child.args, url.buf);
 944         for (i = 0; i < nr_spec; i++)
 945                 argv_array_push(&child.args, specs[i]);
 946
 947         if (run_command(&child))
 948                 die("git-http-push failed");
 949         return 0;
 950 }
 951
 952 static int push_git(struct discovery *heads, int nr_spec, char **specs)
 953 {
 954         struct rpc_state rpc;
 955         int i, err;
 956         struct argv_array args;
 957         struct string_list_item *cas_option;
 958         struct strbuf preamble = STRBUF_INIT;
 959
 960         argv_array_init(&args);
 961         argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 962                          NULL);
 963
 964         if (options.thin)
 965                 argv_array_push(&args, "--thin");
 966         if (options.dry_run)
 967                 argv_array_push(&args, "--dry-run");
 968         if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
 969                 argv_array_push(&args, "--signed=yes");
 970         else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
 971                 argv_array_push(&args, "--signed=if-asked");
 972         if (options.verbosity == 0)
 973                 argv_array_push(&args, "--quiet");
 974         else if (options.verbosity > 1)
 975                 argv_array_push(&args, "--verbose");
 976         for (i = 0; i < options.push_options.nr; i++)
 977                 argv_array_pushf(&args, "--push-option=%s",
 978                                  options.push_options.items[i].string);
 979         argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 980         for_each_string_list_item(cas_option, &cas_options)
 981                 argv_array_push(&args, cas_option->string);
 982         argv_array_push(&args, url.buf);
 983
 984         argv_array_push(&args, "--stdin");
 985         for (i = 0; i < nr_spec; i++)
 986                 packet_buf_write(&preamble, "%s\n", specs[i]);
 987         packet_buf_flush(&preamble);
 988
 989         memset(&rpc, 0, sizeof(rpc));
 990         rpc.service_name = "git-receive-pack",
 991         rpc.argv = args.argv;
 992         rpc.stdin_preamble = &preamble;
 993
 994         err = rpc_service(&rpc, heads);
 995         if (rpc.result.len)
 996                 write_or_die(1, rpc.result.buf, rpc.result.len);
 997         strbuf_release(&rpc.result);
 998         strbuf_release(&preamble);
 999         argv_array_clear(&args);
1000         return err;
1001 }
1002
1003 static int push(int nr_spec, char **specs)
1004 {
1005         struct discovery *heads = discover_refs("git-receive-pack", 1);
1006         int ret;
1007
1008         if (heads->proto_git)
1009                 ret = push_git(heads, nr_spec, specs);
1010         else
1011                 ret = push_dav(nr_spec, specs);
1012         free_discovery(heads);
1013         return ret;
1014 }
1015
1016 static void parse_push(struct strbuf *buf)
1017 {
1018         char **specs = NULL;
1019         int alloc_spec = 0, nr_spec = 0, i, ret;
1020
1021         do {
1022                 if (starts_with(buf->buf, "push ")) {
1023                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
1024                         specs[nr_spec++] = xstrdup(buf->buf + 5);
1025                 }
1026                 else
1027                         die("http transport does not support %s", buf->buf);
1028
1029                 strbuf_reset(buf);
1030                 if (strbuf_getline_lf(buf, stdin) == EOF)
1031                         goto free_specs;
1032                 if (!*buf->buf)
1033                         break;
1034         } while (1);
1035
1036         ret = push(nr_spec, specs);
1037         printf("\n");
1038         fflush(stdout);
1039
1040         if (ret)
1041                 exit(128); /* error already reported */
1042
1043  free_specs:
1044         for (i = 0; i < nr_spec; i++)
1045                 free(specs[i]);
1046         free(specs);
1047 }
1048
1049 int cmd_main(int argc, const char **argv)
1050 {
1051         struct strbuf buf = STRBUF_INIT;
1052         int nongit;
1053
1054         setup_git_directory_gently(&nongit);
1055         if (argc < 2) {
1056                 error("remote-curl: usage: git remote-curl <remote> [<url>]");
1057                 return 1;
1058         }
1059
1060         options.verbosity = 1;
1061         options.progress = !!isatty(2);
1062         options.thin = 1;
1063         string_list_init(&options.deepen_not, 1);
1064         string_list_init(&options.push_options, 1);
1065
1066         remote = remote_get(argv[1]);
1067
1068         if (argc > 2) {
1069                 end_url_with_slash(&url, argv[2]);
1070         } else {
1071                 end_url_with_slash(&url, remote->url[0]);
1072         }
1073
1074         http_init(remote, url.buf, 0);
1075
1076         do {
1077                 const char *arg;
1078
1079                 if (strbuf_getline_lf(&buf, stdin) == EOF) {
1080                         if (ferror(stdin))
1081                                 error("remote-curl: error reading command stream from git");
1082                         return 1;
1083                 }
1084                 if (buf.len == 0)
1085                         break;
1086                 if (starts_with(buf.buf, "fetch ")) {
1087                         if (nongit)
1088                                 die("remote-curl: fetch attempted without a local repo");
1089                         parse_fetch(&buf);
1090
1091                 } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1092                         int for_push = !!strstr(buf.buf + 4, "for-push");
1093                         output_refs(get_refs(for_push));
1094
1095                 } else if (starts_with(buf.buf, "push ")) {
1096                         parse_push(&buf);
1097
1098                 } else if (skip_prefix(buf.buf, "option ", &arg)) {
1099                         char *value = strchr(arg, ' ');
1100                         int result;
1101
1102                         if (value)
1103                                 *value++ = '\0';
1104                         else
1105                                 value = "true";
1106
1107                         result = set_option(arg, value);
1108                         if (!result)
1109                                 printf("ok\n");
1110                         else if (result < 0)
1111                                 printf("error invalid value\n");
1112                         else
1113                                 printf("unsupported\n");
1114                         fflush(stdout);
1115
1116                 } else if (!strcmp(buf.buf, "capabilities")) {
1117                         printf("fetch\n");
1118                         printf("option\n");
1119                         printf("push\n");
1120                         printf("check-connectivity\n");
1121                         printf("\n");
1122                         fflush(stdout);
1123                 } else {
1124                         error("remote-curl: unknown command '%s' from git", buf.buf);
1125                         return 1;
1126                 }
1127                 strbuf_reset(&buf);
1128         } while (1);
1129
1130         http_cleanup();
1131
1132         return 0;
1133 }