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 #include "quote.h"
  19 #include "transport.h"
  20
  21 static struct remote *remote;
  22 /* always ends with a trailing slash */
  23 static struct strbuf url = STRBUF_INIT;
  24
  25 struct options {
  26         int verbosity;
  27         unsigned long depth;
  28         char *deepen_since;
  29         struct string_list deepen_not;
  30         struct string_list push_options;
  31         char *filter;
  32         unsigned progress : 1,
  33                 check_self_contained_and_connected : 1,
  34                 cloning : 1,
  35                 update_shallow : 1,
  36                 followtags : 1,
  37                 dry_run : 1,
  38                 thin : 1,
  39                 /* One of the SEND_PACK_PUSH_CERT_* constants. */
  40                 push_cert : 2,
  41                 deepen_relative : 1,
  42                 from_promisor : 1,
  43                 no_dependents : 1;
  44 };
  45 static struct options options;
  46 static struct string_list cas_options = STRING_LIST_INIT_DUP;
  47
  48 static int set_option(const char *name, const char *value)
  49 {
  50         if (!strcmp(name, "verbosity")) {
  51                 char *end;
  52                 int v = strtol(value, &end, 10);
  53                 if (value == end || *end)
  54                         return -1;
  55                 options.verbosity = v;
  56                 return 0;
  57         }
  58         else if (!strcmp(name, "progress")) {
  59                 if (!strcmp(value, "true"))
  60                         options.progress = 1;
  61                 else if (!strcmp(value, "false"))
  62                         options.progress = 0;
  63                 else
  64                         return -1;
  65                 return 0;
  66         }
  67         else if (!strcmp(name, "depth")) {
  68                 char *end;
  69                 unsigned long v = strtoul(value, &end, 10);
  70                 if (value == end || *end)
  71                         return -1;
  72                 options.depth = v;
  73                 return 0;
  74         }
  75         else if (!strcmp(name, "deepen-since")) {
  76                 options.deepen_since = xstrdup(value);
  77                 return 0;
  78         }
  79         else if (!strcmp(name, "deepen-not")) {
  80                 string_list_append(&options.deepen_not, value);
  81                 return 0;
  82         }
  83         else if (!strcmp(name, "deepen-relative")) {
  84                 if (!strcmp(value, "true"))
  85                         options.deepen_relative = 1;
  86                 else if (!strcmp(value, "false"))
  87                         options.deepen_relative = 0;
  88                 else
  89                         return -1;
  90                 return 0;
  91         }
  92         else if (!strcmp(name, "followtags")) {
  93                 if (!strcmp(value, "true"))
  94                         options.followtags = 1;
  95                 else if (!strcmp(value, "false"))
  96                         options.followtags = 0;
  97                 else
  98                         return -1;
  99                 return 0;
 100         }
 101         else if (!strcmp(name, "dry-run")) {
 102                 if (!strcmp(value, "true"))
 103                         options.dry_run = 1;
 104                 else if (!strcmp(value, "false"))
 105                         options.dry_run = 0;
 106                 else
 107                         return -1;
 108                 return 0;
 109         }
 110         else if (!strcmp(name, "check-connectivity")) {
 111                 if (!strcmp(value, "true"))
 112                         options.check_self_contained_and_connected = 1;
 113                 else if (!strcmp(value, "false"))
 114                         options.check_self_contained_and_connected = 0;
 115                 else
 116                         return -1;
 117                 return 0;
 118         }
 119         else if (!strcmp(name, "cas")) {
 120                 struct strbuf val = STRBUF_INIT;
 121                 strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
 122                 string_list_append(&cas_options, val.buf);
 123                 strbuf_release(&val);
 124                 return 0;
 125         } else if (!strcmp(name, "cloning")) {
 126                 if (!strcmp(value, "true"))
 127                         options.cloning = 1;
 128                 else if (!strcmp(value, "false"))
 129                         options.cloning = 0;
 130                 else
 131                         return -1;
 132                 return 0;
 133         } else if (!strcmp(name, "update-shallow")) {
 134                 if (!strcmp(value, "true"))
 135                         options.update_shallow = 1;
 136                 else if (!strcmp(value, "false"))
 137                         options.update_shallow = 0;
 138                 else
 139                         return -1;
 140                 return 0;
 141         } else if (!strcmp(name, "pushcert")) {
 142                 if (!strcmp(value, "true"))
 143                         options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 144                 else if (!strcmp(value, "false"))
 145                         options.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 146                 else if (!strcmp(value, "if-asked"))
 147                         options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 148                 else
 149                         return -1;
 150                 return 0;
 151         } else if (!strcmp(name, "push-option")) {
 152                 if (*value != '"')
 153                         string_list_append(&options.push_options, value);
 154                 else {
 155                         struct strbuf unquoted = STRBUF_INIT;
 156                         if (unquote_c_style(&unquoted, value, NULL) < 0)
 157                                 die(_("invalid quoting in push-option value: '%s'"), value);
 158                         string_list_append_nodup(&options.push_options,
 159                                                  strbuf_detach(&unquoted, NULL));
 160                 }
 161                 return 0;
 162
 163 #if LIBCURL_VERSION_NUM >= 0x070a08
 164         } else if (!strcmp(name, "family")) {
 165                 if (!strcmp(value, "ipv4"))
 166                         git_curl_ipresolve = CURL_IPRESOLVE_V4;
 167                 else if (!strcmp(value, "ipv6"))
 168                         git_curl_ipresolve = CURL_IPRESOLVE_V6;
 169                 else if (!strcmp(value, "all"))
 170                         git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
 171                 else
 172                         return -1;
 173                 return 0;
 174 #endif /* LIBCURL_VERSION_NUM >= 0x070a08 */
 175         } else if (!strcmp(name, "from-promisor")) {
 176                 options.from_promisor = 1;
 177                 return 0;
 178         } else if (!strcmp(name, "no-dependents")) {
 179                 options.no_dependents = 1;
 180                 return 0;
 181         } else if (!strcmp(name, "filter")) {
 182                 options.filter = xstrdup(value);
 183                 return 0;
 184         } else {
 185                 return 1 /* unsupported */;
 186         }
 187 }
 188
 189 struct discovery {
 190         char *service;
 191         char *buf_alloc;
 192         char *buf;
 193         size_t len;
 194         struct ref *refs;
 195         struct oid_array shallow;
 196         enum protocol_version version;
 197         unsigned proto_git : 1;
 198 };
 199 static struct discovery *last_discovery;
 200
 201 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 202 {
 203         struct ref *list = NULL;
 204         struct packet_reader reader;
 205
 206         packet_reader_init(&reader, -1, heads->buf, heads->len,
 207                            PACKET_READ_CHOMP_NEWLINE |
 208                            PACKET_READ_GENTLE_ON_EOF |
 209                            PACKET_READ_DIE_ON_ERR_PACKET);
 210
 211         heads->version = discover_version(&reader);
 212         switch (heads->version) {
 213         case protocol_v2:
 214                 /*
 215                  * Do nothing.  This isn't a list of refs but rather a
 216                  * capability advertisement.  Client would have run
 217                  * 'stateless-connect' so we'll dump this capability listing
 218                  * and let them request the refs themselves.
 219                  */
 220                 break;
 221         case protocol_v1:
 222         case protocol_v0:
 223                 get_remote_heads(&reader, &list, for_push ? REF_NORMAL : 0,
 224                                  NULL, &heads->shallow);
 225                 break;
 226         case protocol_unknown_version:
 227                 BUG("unknown protocol version");
 228         }
 229
 230         return list;
 231 }
 232
 233 static struct ref *parse_info_refs(struct discovery *heads)
 234 {
 235         char *data, *start, *mid;
 236         char *ref_name;
 237         int i = 0;
 238
 239         struct ref *refs = NULL;
 240         struct ref *ref = NULL;
 241         struct ref *last_ref = NULL;
 242
 243         data = heads->buf;
 244         start = NULL;
 245         mid = data;
 246         while (i < heads->len) {
 247                 if (!start) {
 248                         start = &data[i];
 249                 }
 250                 if (data[i] == '\t')
 251                         mid = &data[i];
 252                 if (data[i] == '\n') {
 253                         if (mid - start != the_hash_algo->hexsz)
 254                                 die(_("%sinfo/refs not valid: is this a git repository?"),
 255                                     transport_anonymize_url(url.buf));
 256                         data[i] = 0;
 257                         ref_name = mid + 1;
 258                         ref = alloc_ref(ref_name);
 259                         get_oid_hex(start, &ref->old_oid);
 260                         if (!refs)
 261                                 refs = ref;
 262                         if (last_ref)
 263                                 last_ref->next = ref;
 264                         last_ref = ref;
 265                         start = NULL;
 266                 }
 267                 i++;
 268         }
 269
 270         ref = alloc_ref("HEAD");
 271         if (!http_fetch_ref(url.buf, ref) &&
 272             !resolve_remote_symref(ref, refs)) {
 273                 ref->next = refs;
 274                 refs = ref;
 275         } else {
 276                 free(ref);
 277         }
 278
 279         return refs;
 280 }
 281
 282 static void free_discovery(struct discovery *d)
 283 {
 284         if (d) {
 285                 if (d == last_discovery)
 286                         last_discovery = NULL;
 287                 free(d->shallow.oid);
 288                 free(d->buf_alloc);
 289                 free_refs(d->refs);
 290                 free(d->service);
 291                 free(d);
 292         }
 293 }
 294
 295 static int show_http_message(struct strbuf *type, struct strbuf *charset,
 296                              struct strbuf *msg)
 297 {
 298         const char *p, *eol;
 299
 300         /*
 301          * We only show text/plain parts, as other types are likely
 302          * to be ugly to look at on the user's terminal.
 303          */
 304         if (strcmp(type->buf, "text/plain"))
 305                 return -1;
 306         if (charset->len)
 307                 strbuf_reencode(msg, charset->buf, get_log_output_encoding());
 308
 309         strbuf_trim(msg);
 310         if (!msg->len)
 311                 return -1;
 312
 313         p = msg->buf;
 314         do {
 315                 eol = strchrnul(p, '\n');
 316                 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 317                 p = eol + 1;
 318         } while(*eol);
 319         return 0;
 320 }
 321
 322 static int get_protocol_http_header(enum protocol_version version,
 323                                     struct strbuf *header)
 324 {
 325         if (version > 0) {
 326                 strbuf_addf(header, GIT_PROTOCOL_HEADER ": version=%d",
 327                             version);
 328
 329                 return 1;
 330         }
 331
 332         return 0;
 333 }
 334
 335 static void check_smart_http(struct discovery *d, const char *service,
 336                              struct strbuf *type)
 337 {
 338         const char *p;
 339         struct packet_reader reader;
 340
 341         /*
 342          * If we don't see x-$service-advertisement, then it's not smart-http.
 343          * But once we do, we commit to it and assume any other protocol
 344          * violations are hard errors.
 345          */
 346         if (!skip_prefix(type->buf, "application/x-", &p) ||
 347             !skip_prefix(p, service, &p) ||
 348             strcmp(p, "-advertisement"))
 349                 return;
 350
 351         packet_reader_init(&reader, -1, d->buf, d->len,
 352                            PACKET_READ_CHOMP_NEWLINE |
 353                            PACKET_READ_DIE_ON_ERR_PACKET);
 354         if (packet_reader_read(&reader) != PACKET_READ_NORMAL)
 355                 die(_("invalid server response; expected service, got flush packet"));
 356
 357         if (skip_prefix(reader.line, "# service=", &p) && !strcmp(p, service)) {
 358                 /*
 359                  * The header can include additional metadata lines, up
 360                  * until a packet flush marker.  Ignore these now, but
 361                  * in the future we might start to scan them.
 362                  */
 363                 for (;;) {
 364                         packet_reader_read(&reader);
 365                         if (reader.pktlen <= 0) {
 366                                 break;
 367                         }
 368                 }
 369
 370                 /*
 371                  * v0 smart http; callers expect us to soak up the
 372                  * service and header packets
 373                  */
 374                 d->buf = reader.src_buffer;
 375                 d->len = reader.src_len;
 376                 d->proto_git = 1;
 377
 378         } else if (!strcmp(reader.line, "version 2")) {
 379                 /*
 380                  * v2 smart http; do not consume version packet, which will
 381                  * be handled elsewhere.
 382                  */
 383                 d->proto_git = 1;
 384
 385         } else {
 386                 die(_("invalid server response; got '%s'"), reader.line);
 387         }
 388 }
 389
 390 static struct discovery *discover_refs(const char *service, int for_push)
 391 {
 392         struct strbuf type = STRBUF_INIT;
 393         struct strbuf charset = STRBUF_INIT;
 394         struct strbuf buffer = STRBUF_INIT;
 395         struct strbuf refs_url = STRBUF_INIT;
 396         struct strbuf effective_url = STRBUF_INIT;
 397         struct strbuf protocol_header = STRBUF_INIT;
 398         struct string_list extra_headers = STRING_LIST_INIT_DUP;
 399         struct discovery *last = last_discovery;
 400         int http_ret, maybe_smart = 0;
 401         struct http_get_options http_options;
 402         enum protocol_version version = get_protocol_version_config();
 403
 404         if (last && !strcmp(service, last->service))
 405                 return last;
 406         free_discovery(last);
 407
 408         strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 409         if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 410              git_env_bool("GIT_SMART_HTTP", 1)) {
 411                 maybe_smart = 1;
 412                 if (!strchr(url.buf, '?'))
 413                         strbuf_addch(&refs_url, '?');
 414                 else
 415                         strbuf_addch(&refs_url, '&');
 416                 strbuf_addf(&refs_url, "service=%s", service);
 417         }
 418
 419         /*
 420          * NEEDSWORK: If we are trying to use protocol v2 and we are planning
 421          * to perform a push, then fallback to v0 since the client doesn't know
 422          * how to push yet using v2.
 423          */
 424         if (version == protocol_v2 && !strcmp("git-receive-pack", service))
 425                 version = protocol_v0;
 426
 427         /* Add the extra Git-Protocol header */
 428         if (get_protocol_http_header(version, &protocol_header))
 429                 string_list_append(&extra_headers, protocol_header.buf);
 430
 431         memset(&http_options, 0, sizeof(http_options));
 432         http_options.content_type = &type;
 433         http_options.charset = &charset;
 434         http_options.effective_url = &effective_url;
 435         http_options.base_url = &url;
 436         http_options.extra_headers = &extra_headers;
 437         http_options.initial_request = 1;
 438         http_options.no_cache = 1;
 439
 440         http_ret = http_get_strbuf(refs_url.buf, &buffer, &http_options);
 441         switch (http_ret) {
 442         case HTTP_OK:
 443                 break;
 444         case HTTP_MISSING_TARGET:
 445                 show_http_message(&type, &charset, &buffer);
 446                 die(_("repository '%s' not found"),
 447                     transport_anonymize_url(url.buf));
 448         case HTTP_NOAUTH:
 449                 show_http_message(&type, &charset, &buffer);
 450                 die(_("Authentication failed for '%s'"),
 451                     transport_anonymize_url(url.buf));
 452         default:
 453                 show_http_message(&type, &charset, &buffer);
 454                 die(_("unable to access '%s': %s"),
 455                     transport_anonymize_url(url.buf), curl_errorstr);
 456         }
 457
 458         if (options.verbosity && !starts_with(refs_url.buf, url.buf)) {
 459                 char *u = transport_anonymize_url(url.buf);
 460                 warning(_("redirecting to %s"), u);
 461                 free(u);
 462         }
 463
 464         last= xcalloc(1, sizeof(*last_discovery));
 465         last->service = xstrdup(service);
 466         last->buf_alloc = strbuf_detach(&buffer, &last->len);
 467         last->buf = last->buf_alloc;
 468
 469         if (maybe_smart)
 470                 check_smart_http(last, service, &type);
 471
 472         if (last->proto_git)
 473                 last->refs = parse_git_refs(last, for_push);
 474         else
 475                 last->refs = parse_info_refs(last);
 476
 477         strbuf_release(&refs_url);
 478         strbuf_release(&type);
 479         strbuf_release(&charset);
 480         strbuf_release(&effective_url);
 481         strbuf_release(&buffer);
 482         strbuf_release(&protocol_header);
 483         string_list_clear(&extra_headers, 0);
 484         last_discovery = last;
 485         return last;
 486 }
 487
 488 static struct ref *get_refs(int for_push)
 489 {
 490         struct discovery *heads;
 491
 492         if (for_push)
 493                 heads = discover_refs("git-receive-pack", for_push);
 494         else
 495                 heads = discover_refs("git-upload-pack", for_push);
 496
 497         return heads->refs;
 498 }
 499
 500 static void output_refs(struct ref *refs)
 501 {
 502         struct ref *posn;
 503         for (posn = refs; posn; posn = posn->next) {
 504                 if (posn->symref)
 505                         printf("@%s %s\n", posn->symref, posn->name);
 506                 else
 507                         printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name);
 508         }
 509         printf("\n");
 510         fflush(stdout);
 511 }
 512
 513 struct rpc_state {
 514         const char *service_name;
 515         char *service_url;
 516         char *hdr_content_type;
 517         char *hdr_accept;
 518         char *protocol_header;
 519         char *buf;
 520         size_t alloc;
 521         size_t len;
 522         size_t pos;
 523         int in;
 524         int out;
 525         int any_written;
 526         unsigned gzip_request : 1;
 527         unsigned initial_buffer : 1;
 528
 529         /*
 530          * Whenever a pkt-line is read into buf, append the 4 characters
 531          * denoting its length before appending the payload.
 532          */
 533         unsigned write_line_lengths : 1;
 534
 535         /*
 536          * Used by rpc_out; initialize to 0. This is true if a flush has been
 537          * read, but the corresponding line length (if write_line_lengths is
 538          * true) and EOF have not been sent to libcurl. Since each flush marks
 539          * the end of a request, each flush must be completely sent before any
 540          * further reading occurs.
 541          */
 542         unsigned flush_read_but_not_sent : 1;
 543 };
 544
 545 /*
 546  * Appends the result of reading from rpc->out to the string represented by
 547  * rpc->buf and rpc->len if there is enough space. Returns 1 if there was
 548  * enough space, 0 otherwise.
 549  *
 550  * If rpc->write_line_lengths is true, appends the line length as a 4-byte
 551  * hexadecimal string before appending the result described above.
 552  *
 553  * Writes the total number of bytes appended into appended.
 554  */
 555 static int rpc_read_from_out(struct rpc_state *rpc, int options,
 556                              size_t *appended,
 557                              enum packet_read_status *status) {
 558         size_t left;
 559         char *buf;
 560         int pktlen_raw;
 561
 562         if (rpc->write_line_lengths) {
 563                 left = rpc->alloc - rpc->len - 4;
 564                 buf = rpc->buf + rpc->len + 4;
 565         } else {
 566                 left = rpc->alloc - rpc->len;
 567                 buf = rpc->buf + rpc->len;
 568         }
 569
 570         if (left < LARGE_PACKET_MAX)
 571                 return 0;
 572
 573         *status = packet_read_with_status(rpc->out, NULL, NULL, buf,
 574                         left, &pktlen_raw, options);
 575         if (*status != PACKET_READ_EOF) {
 576                 *appended = pktlen_raw + (rpc->write_line_lengths ? 4 : 0);
 577                 rpc->len += *appended;
 578         }
 579
 580         if (rpc->write_line_lengths) {
 581                 switch (*status) {
 582                 case PACKET_READ_EOF:
 583                         if (!(options & PACKET_READ_GENTLE_ON_EOF))
 584                                 die(_("shouldn't have EOF when not gentle on EOF"));
 585                         break;
 586                 case PACKET_READ_NORMAL:
 587                         set_packet_header(buf - 4, *appended);
 588                         break;
 589                 case PACKET_READ_DELIM:
 590                         memcpy(buf - 4, "0001", 4);
 591                         break;
 592                 case PACKET_READ_FLUSH:
 593                         memcpy(buf - 4, "0000", 4);
 594                         break;
 595                 }
 596         }
 597
 598         return 1;
 599 }
 600
 601 static size_t rpc_out(void *ptr, size_t eltsize,
 602                 size_t nmemb, void *buffer_)
 603 {
 604         size_t max = eltsize * nmemb;
 605         struct rpc_state *rpc = buffer_;
 606         size_t avail = rpc->len - rpc->pos;
 607         enum packet_read_status status;
 608
 609         if (!avail) {
 610                 rpc->initial_buffer = 0;
 611                 rpc->len = 0;
 612                 rpc->pos = 0;
 613                 if (!rpc->flush_read_but_not_sent) {
 614                         if (!rpc_read_from_out(rpc, 0, &avail, &status))
 615                                 BUG("The entire rpc->buf should be larger than LARGE_PACKET_MAX");
 616                         if (status == PACKET_READ_FLUSH)
 617                                 rpc->flush_read_but_not_sent = 1;
 618                 }
 619                 /*
 620                  * If flush_read_but_not_sent is true, we have already read one
 621                  * full request but have not fully sent it + EOF, which is why
 622                  * we need to refrain from reading.
 623                  */
 624         }
 625         if (rpc->flush_read_but_not_sent) {
 626                 if (!avail) {
 627                         /*
 628                          * The line length either does not need to be sent at
 629                          * all or has already been completely sent. Now we can
 630                          * return 0, indicating EOF, meaning that the flush has
 631                          * been fully sent.
 632                          */
 633                         rpc->flush_read_but_not_sent = 0;
 634                         return 0;
 635                 }
 636                 /*
 637                  * If avail is non-zerp, the line length for the flush still
 638                  * hasn't been fully sent. Proceed with sending the line
 639                  * length.
 640                  */
 641         }
 642
 643         if (max < avail)
 644                 avail = max;
 645         memcpy(ptr, rpc->buf + rpc->pos, avail);
 646         rpc->pos += avail;
 647         return avail;
 648 }
 649
 650 #ifndef NO_CURL_IOCTL
 651 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 652 {
 653         struct rpc_state *rpc = clientp;
 654
 655         switch (cmd) {
 656         case CURLIOCMD_NOP:
 657                 return CURLIOE_OK;
 658
 659         case CURLIOCMD_RESTARTREAD:
 660                 if (rpc->initial_buffer) {
 661                         rpc->pos = 0;
 662                         return CURLIOE_OK;
 663                 }
 664                 error(_("unable to rewind rpc post data - try increasing http.postBuffer"));
 665                 return CURLIOE_FAILRESTART;
 666
 667         default:
 668                 return CURLIOE_UNKNOWNCMD;
 669         }
 670 }
 671 #endif
 672
 673 struct rpc_in_data {
 674         struct rpc_state *rpc;
 675         struct active_request_slot *slot;
 676 };
 677
 678 /*
 679  * A callback for CURLOPT_WRITEFUNCTION. The return value is the bytes consumed
 680  * from ptr.
 681  */
 682 static size_t rpc_in(char *ptr, size_t eltsize,
 683                 size_t nmemb, void *buffer_)
 684 {
 685         size_t size = eltsize * nmemb;
 686         struct rpc_in_data *data = buffer_;
 687         long response_code;
 688
 689         if (curl_easy_getinfo(data->slot->curl, CURLINFO_RESPONSE_CODE,
 690                               &response_code) != CURLE_OK)
 691                 return size;
 692         if (response_code >= 300)
 693                 return size;
 694         if (size)
 695                 data->rpc->any_written = 1;
 696         write_or_die(data->rpc->in, ptr, size);
 697         return size;
 698 }
 699
 700 static int run_slot(struct active_request_slot *slot,
 701                     struct slot_results *results)
 702 {
 703         int err;
 704         struct slot_results results_buf;
 705
 706         if (!results)
 707                 results = &results_buf;
 708
 709         err = run_one_slot(slot, results);
 710
 711         if (err != HTTP_OK && err != HTTP_REAUTH) {
 712                 struct strbuf msg = STRBUF_INIT;
 713                 if (results->http_code && results->http_code != 200)
 714                         strbuf_addf(&msg, "HTTP %ld", results->http_code);
 715                 if (results->curl_result != CURLE_OK) {
 716                         if (msg.len)
 717                                 strbuf_addch(&msg, ' ');
 718                         strbuf_addf(&msg, "curl %d", results->curl_result);
 719                         if (curl_errorstr[0]) {
 720                                 strbuf_addch(&msg, ' ');
 721                                 strbuf_addstr(&msg, curl_errorstr);
 722                         }
 723                 }
 724                 error(_("RPC failed; %s"), msg.buf);
 725                 strbuf_release(&msg);
 726         }
 727
 728         return err;
 729 }
 730
 731 static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 732 {
 733         struct active_request_slot *slot;
 734         struct curl_slist *headers = http_copy_default_headers();
 735         struct strbuf buf = STRBUF_INIT;
 736         int err;
 737
 738         slot = get_active_slot();
 739
 740         headers = curl_slist_append(headers, rpc->hdr_content_type);
 741         headers = curl_slist_append(headers, rpc->hdr_accept);
 742
 743         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 744         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 745         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 746         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 747         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 748         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 749         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 750         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 751         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 752
 753         err = run_slot(slot, results);
 754
 755         curl_slist_free_all(headers);
 756         strbuf_release(&buf);
 757         return err;
 758 }
 759
 760 static curl_off_t xcurl_off_t(size_t len)
 761 {
 762         uintmax_t size = len;
 763         if (size > maximum_signed_value_of_type(curl_off_t))
 764                 die(_("cannot handle pushes this big"));
 765         return (curl_off_t)size;
 766 }
 767
 768 /*
 769  * If flush_received is true, do not attempt to read any more; just use what's
 770  * in rpc->buf.
 771  */
 772 static int post_rpc(struct rpc_state *rpc, int flush_received)
 773 {
 774         struct active_request_slot *slot;
 775         struct curl_slist *headers = http_copy_default_headers();
 776         int use_gzip = rpc->gzip_request;
 777         char *gzip_body = NULL;
 778         size_t gzip_size = 0;
 779         int err, large_request = 0;
 780         int needs_100_continue = 0;
 781         struct rpc_in_data rpc_in_data;
 782
 783         /* Try to load the entire request, if we can fit it into the
 784          * allocated buffer space we can use HTTP/1.0 and avoid the
 785          * chunked encoding mess.
 786          */
 787         if (!flush_received) {
 788                 while (1) {
 789                         size_t n;
 790                         enum packet_read_status status;
 791
 792                         if (!rpc_read_from_out(rpc, 0, &n, &status)) {
 793                                 large_request = 1;
 794                                 use_gzip = 0;
 795                                 break;
 796                         }
 797                         if (status == PACKET_READ_FLUSH)
 798                                 break;
 799                 }
 800         }
 801
 802         if (large_request) {
 803                 struct slot_results results;
 804
 805                 do {
 806                         err = probe_rpc(rpc, &results);
 807                         if (err == HTTP_REAUTH)
 808                                 credential_fill(&http_auth);
 809                 } while (err == HTTP_REAUTH);
 810                 if (err != HTTP_OK)
 811                         return -1;
 812
 813                 if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 814                         needs_100_continue = 1;
 815         }
 816
 817         headers = curl_slist_append(headers, rpc->hdr_content_type);
 818         headers = curl_slist_append(headers, rpc->hdr_accept);
 819         headers = curl_slist_append(headers, needs_100_continue ?
 820                 "Expect: 100-continue" : "Expect:");
 821
 822         /* Add the extra Git-Protocol header */
 823         if (rpc->protocol_header)
 824                 headers = curl_slist_append(headers, rpc->protocol_header);
 825
 826 retry:
 827         slot = get_active_slot();
 828
 829         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 830         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 831         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 832         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 833
 834         if (large_request) {
 835                 /* The request body is large and the size cannot be predicted.
 836                  * We must use chunked encoding to send it.
 837                  */
 838                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 839                 rpc->initial_buffer = 1;
 840                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 841                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 842 #ifndef NO_CURL_IOCTL
 843                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 844                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 845 #endif
 846                 if (options.verbosity > 1) {
 847                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 848                         fflush(stderr);
 849                 }
 850
 851         } else if (gzip_body) {
 852                 /*
 853                  * If we are looping to retry authentication, then the previous
 854                  * run will have set up the headers and gzip buffer already,
 855                  * and we just need to send it.
 856                  */
 857                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 858                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 859
 860         } else if (use_gzip && 1024 < rpc->len) {
 861                 /* The client backend isn't giving us compressed data so
 862                  * we can try to deflate it ourselves, this may save on
 863                  * the transfer time.
 864                  */
 865                 git_zstream stream;
 866                 int ret;
 867
 868                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 869                 gzip_size = git_deflate_bound(&stream, rpc->len);
 870                 gzip_body = xmalloc(gzip_size);
 871
 872                 stream.next_in = (unsigned char *)rpc->buf;
 873                 stream.avail_in = rpc->len;
 874                 stream.next_out = (unsigned char *)gzip_body;
 875                 stream.avail_out = gzip_size;
 876
 877                 ret = git_deflate(&stream, Z_FINISH);
 878                 if (ret != Z_STREAM_END)
 879                         die(_("cannot deflate request; zlib deflate error %d"), ret);
 880
 881                 ret = git_deflate_end_gently(&stream);
 882                 if (ret != Z_OK)
 883                         die(_("cannot deflate request; zlib end error %d"), ret);
 884
 885                 gzip_size = stream.total_out;
 886
 887                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 888                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 889                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 890
 891                 if (options.verbosity > 1) {
 892                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 893                                 rpc->service_name,
 894                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
 895                         fflush(stderr);
 896                 }
 897         } else {
 898                 /* We know the complete request size in advance, use the
 899                  * more normal Content-Length approach.
 900                  */
 901                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 902                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(rpc->len));
 903                 if (options.verbosity > 1) {
 904                         fprintf(stderr, "POST %s (%lu bytes)\n",
 905                                 rpc->service_name, (unsigned long)rpc->len);
 906                         fflush(stderr);
 907                 }
 908         }
 909
 910         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 911         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 912         rpc_in_data.rpc = rpc;
 913         rpc_in_data.slot = slot;
 914         curl_easy_setopt(slot->curl, CURLOPT_FILE, &rpc_in_data);
 915         curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
 916
 917
 918         rpc->any_written = 0;
 919         err = run_slot(slot, NULL);
 920         if (err == HTTP_REAUTH && !large_request) {
 921                 credential_fill(&http_auth);
 922                 goto retry;
 923         }
 924         if (err != HTTP_OK)
 925                 err = -1;
 926
 927         if (!rpc->any_written)
 928                 err = -1;
 929
 930         curl_slist_free_all(headers);
 931         free(gzip_body);
 932         return err;
 933 }
 934
 935 static int rpc_service(struct rpc_state *rpc, struct discovery *heads,
 936                        const char **client_argv, const struct strbuf *preamble,
 937                        struct strbuf *rpc_result)
 938 {
 939         const char *svc = rpc->service_name;
 940         struct strbuf buf = STRBUF_INIT;
 941         struct child_process client = CHILD_PROCESS_INIT;
 942         int err = 0;
 943
 944         client.in = -1;
 945         client.out = -1;
 946         client.git_cmd = 1;
 947         client.argv = client_argv;
 948         if (start_command(&client))
 949                 exit(1);
 950         write_or_die(client.in, preamble->buf, preamble->len);
 951         if (heads)
 952                 write_or_die(client.in, heads->buf, heads->len);
 953
 954         rpc->alloc = http_post_buffer;
 955         rpc->buf = xmalloc(rpc->alloc);
 956         rpc->in = client.in;
 957         rpc->out = client.out;
 958
 959         strbuf_addf(&buf, "%s%s", url.buf, svc);
 960         rpc->service_url = strbuf_detach(&buf, NULL);
 961
 962         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 963         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 964
 965         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 966         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 967
 968         if (get_protocol_http_header(heads->version, &buf))
 969                 rpc->protocol_header = strbuf_detach(&buf, NULL);
 970         else
 971                 rpc->protocol_header = NULL;
 972
 973         while (!err) {
 974                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 975                 if (!n)
 976                         break;
 977                 rpc->pos = 0;
 978                 rpc->len = n;
 979                 err |= post_rpc(rpc, 0);
 980         }
 981
 982         close(client.in);
 983         client.in = -1;
 984         if (!err) {
 985                 strbuf_read(rpc_result, client.out, 0);
 986         } else {
 987                 char buf[4096];
 988                 for (;;)
 989                         if (xread(client.out, buf, sizeof(buf)) <= 0)
 990                                 break;
 991         }
 992
 993         close(client.out);
 994         client.out = -1;
 995
 996         err |= finish_command(&client);
 997         free(rpc->service_url);
 998         free(rpc->hdr_content_type);
 999         free(rpc->hdr_accept);
1000         free(rpc->protocol_header);
1001         free(rpc->buf);
1002         strbuf_release(&buf);
1003         return err;
1004 }
1005
1006 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
1007 {
1008         struct walker *walker;
1009         char **targets;
1010         int ret, i;
1011
1012         ALLOC_ARRAY(targets, nr_heads);
1013         if (options.depth || options.deepen_since)
1014                 die(_("dumb http transport does not support shallow capabilities"));
1015         for (i = 0; i < nr_heads; i++)
1016                 targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
1017
1018         walker = get_http_walker(url.buf);
1019         walker->get_verbosely = options.verbosity >= 3;
1020         walker->get_recover = 0;
1021         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
1022         walker_free(walker);
1023
1024         for (i = 0; i < nr_heads; i++)
1025                 free(targets[i]);
1026         free(targets);
1027
1028         return ret ? error(_("fetch failed.")) : 0;
1029 }
1030
1031 static int fetch_git(struct discovery *heads,
1032         int nr_heads, struct ref **to_fetch)
1033 {
1034         struct rpc_state rpc;
1035         struct strbuf preamble = STRBUF_INIT;
1036         int i, err;
1037         struct argv_array args = ARGV_ARRAY_INIT;
1038         struct strbuf rpc_result = STRBUF_INIT;
1039
1040         argv_array_pushl(&args, "fetch-pack", "--stateless-rpc",
1041                          "--stdin", "--lock-pack", NULL);
1042         if (options.followtags)
1043                 argv_array_push(&args, "--include-tag");
1044         if (options.thin)
1045                 argv_array_push(&args, "--thin");
1046         if (options.verbosity >= 3)
1047                 argv_array_pushl(&args, "-v", "-v", NULL);
1048         if (options.check_self_contained_and_connected)
1049                 argv_array_push(&args, "--check-self-contained-and-connected");
1050         if (options.cloning)
1051                 argv_array_push(&args, "--cloning");
1052         if (options.update_shallow)
1053                 argv_array_push(&args, "--update-shallow");
1054         if (!options.progress)
1055                 argv_array_push(&args, "--no-progress");
1056         if (options.depth)
1057                 argv_array_pushf(&args, "--depth=%lu", options.depth);
1058         if (options.deepen_since)
1059                 argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since);
1060         for (i = 0; i < options.deepen_not.nr; i++)
1061                 argv_array_pushf(&args, "--shallow-exclude=%s",
1062                                  options.deepen_not.items[i].string);
1063         if (options.deepen_relative && options.depth)
1064                 argv_array_push(&args, "--deepen-relative");
1065         if (options.from_promisor)
1066                 argv_array_push(&args, "--from-promisor");
1067         if (options.no_dependents)
1068                 argv_array_push(&args, "--no-dependents");
1069         if (options.filter)
1070                 argv_array_pushf(&args, "--filter=%s", options.filter);
1071         argv_array_push(&args, url.buf);
1072
1073         for (i = 0; i < nr_heads; i++) {
1074                 struct ref *ref = to_fetch[i];
1075                 if (!*ref->name)
1076                         die(_("cannot fetch by sha1 over smart http"));
1077                 packet_buf_write(&preamble, "%s %s\n",
1078                                  oid_to_hex(&ref->old_oid), ref->name);
1079         }
1080         packet_buf_flush(&preamble);
1081
1082         memset(&rpc, 0, sizeof(rpc));
1083         rpc.service_name = "git-upload-pack",
1084         rpc.gzip_request = 1;
1085
1086         err = rpc_service(&rpc, heads, args.argv, &preamble, &rpc_result);
1087         if (rpc_result.len)
1088                 write_or_die(1, rpc_result.buf, rpc_result.len);
1089         strbuf_release(&rpc_result);
1090         strbuf_release(&preamble);
1091         argv_array_clear(&args);
1092         return err;
1093 }
1094
1095 static int fetch(int nr_heads, struct ref **to_fetch)
1096 {
1097         struct discovery *d = discover_refs("git-upload-pack", 0);
1098         if (d->proto_git)
1099                 return fetch_git(d, nr_heads, to_fetch);
1100         else
1101                 return fetch_dumb(nr_heads, to_fetch);
1102 }
1103
1104 static void parse_fetch(struct strbuf *buf)
1105 {
1106         struct ref **to_fetch = NULL;
1107         struct ref *list_head = NULL;
1108         struct ref **list = &list_head;
1109         int alloc_heads = 0, nr_heads = 0;
1110
1111         do {
1112                 const char *p;
1113                 if (skip_prefix(buf->buf, "fetch ", &p)) {
1114                         const char *name;
1115                         struct ref *ref;
1116                         struct object_id old_oid;
1117                         const char *q;
1118
1119                         if (parse_oid_hex(p, &old_oid, &q))
1120                                 die(_("protocol error: expected sha/ref, got '%s'"), p);
1121                         if (*q == ' ')
1122                                 name = q + 1;
1123                         else if (!*q)
1124                                 name = "";
1125                         else
1126                                 die(_("protocol error: expected sha/ref, got '%s'"), p);
1127
1128                         ref = alloc_ref(name);
1129                         oidcpy(&ref->old_oid, &old_oid);
1130
1131                         *list = ref;
1132                         list = &ref->next;
1133
1134                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
1135                         to_fetch[nr_heads++] = ref;
1136                 }
1137                 else
1138                         die(_("http transport does not support %s"), buf->buf);
1139
1140                 strbuf_reset(buf);
1141                 if (strbuf_getline_lf(buf, stdin) == EOF)
1142                         return;
1143                 if (!*buf->buf)
1144                         break;
1145         } while (1);
1146
1147         if (fetch(nr_heads, to_fetch))
1148                 exit(128); /* error already reported */
1149         free_refs(list_head);
1150         free(to_fetch);
1151
1152         printf("\n");
1153         fflush(stdout);
1154         strbuf_reset(buf);
1155 }
1156
1157 static int push_dav(int nr_spec, char **specs)
1158 {
1159         struct child_process child = CHILD_PROCESS_INIT;
1160         size_t i;
1161
1162         child.git_cmd = 1;
1163         argv_array_push(&child.args, "http-push");
1164         argv_array_push(&child.args, "--helper-status");
1165         if (options.dry_run)
1166                 argv_array_push(&child.args, "--dry-run");
1167         if (options.verbosity > 1)
1168                 argv_array_push(&child.args, "--verbose");
1169         argv_array_push(&child.args, url.buf);
1170         for (i = 0; i < nr_spec; i++)
1171                 argv_array_push(&child.args, specs[i]);
1172
1173         if (run_command(&child))
1174                 die(_("git-http-push failed"));
1175         return 0;
1176 }
1177
1178 static int push_git(struct discovery *heads, int nr_spec, char **specs)
1179 {
1180         struct rpc_state rpc;
1181         int i, err;
1182         struct argv_array args;
1183         struct string_list_item *cas_option;
1184         struct strbuf preamble = STRBUF_INIT;
1185         struct strbuf rpc_result = STRBUF_INIT;
1186
1187         argv_array_init(&args);
1188         argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
1189                          NULL);
1190
1191         if (options.thin)
1192                 argv_array_push(&args, "--thin");
1193         if (options.dry_run)
1194                 argv_array_push(&args, "--dry-run");
1195         if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
1196                 argv_array_push(&args, "--signed=yes");
1197         else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
1198                 argv_array_push(&args, "--signed=if-asked");
1199         if (options.verbosity == 0)
1200                 argv_array_push(&args, "--quiet");
1201         else if (options.verbosity > 1)
1202                 argv_array_push(&args, "--verbose");
1203         for (i = 0; i < options.push_options.nr; i++)
1204                 argv_array_pushf(&args, "--push-option=%s",
1205                                  options.push_options.items[i].string);
1206         argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
1207         for_each_string_list_item(cas_option, &cas_options)
1208                 argv_array_push(&args, cas_option->string);
1209         argv_array_push(&args, url.buf);
1210
1211         argv_array_push(&args, "--stdin");
1212         for (i = 0; i < nr_spec; i++)
1213                 packet_buf_write(&preamble, "%s\n", specs[i]);
1214         packet_buf_flush(&preamble);
1215
1216         memset(&rpc, 0, sizeof(rpc));
1217         rpc.service_name = "git-receive-pack",
1218
1219         err = rpc_service(&rpc, heads, args.argv, &preamble, &rpc_result);
1220         if (rpc_result.len)
1221                 write_or_die(1, rpc_result.buf, rpc_result.len);
1222         strbuf_release(&rpc_result);
1223         strbuf_release(&preamble);
1224         argv_array_clear(&args);
1225         return err;
1226 }
1227
1228 static int push(int nr_spec, char **specs)
1229 {
1230         struct discovery *heads = discover_refs("git-receive-pack", 1);
1231         int ret;
1232
1233         if (heads->proto_git)
1234                 ret = push_git(heads, nr_spec, specs);
1235         else
1236                 ret = push_dav(nr_spec, specs);
1237         free_discovery(heads);
1238         return ret;
1239 }
1240
1241 static void parse_push(struct strbuf *buf)
1242 {
1243         char **specs = NULL;
1244         int alloc_spec = 0, nr_spec = 0, i, ret;
1245
1246         do {
1247                 if (starts_with(buf->buf, "push ")) {
1248                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
1249                         specs[nr_spec++] = xstrdup(buf->buf + 5);
1250                 }
1251                 else
1252                         die(_("http transport does not support %s"), buf->buf);
1253
1254                 strbuf_reset(buf);
1255                 if (strbuf_getline_lf(buf, stdin) == EOF)
1256                         goto free_specs;
1257                 if (!*buf->buf)
1258                         break;
1259         } while (1);
1260
1261         ret = push(nr_spec, specs);
1262         printf("\n");
1263         fflush(stdout);
1264
1265         if (ret)
1266                 exit(128); /* error already reported */
1267
1268  free_specs:
1269         for (i = 0; i < nr_spec; i++)
1270                 free(specs[i]);
1271         free(specs);
1272 }
1273
1274 static int stateless_connect(const char *service_name)
1275 {
1276         struct discovery *discover;
1277         struct rpc_state rpc;
1278         struct strbuf buf = STRBUF_INIT;
1279
1280         /*
1281          * Run the info/refs request and see if the server supports protocol
1282          * v2.  If and only if the server supports v2 can we successfully
1283          * establish a stateless connection, otherwise we need to tell the
1284          * client to fallback to using other transport helper functions to
1285          * complete their request.
1286          */
1287         discover = discover_refs(service_name, 0);
1288         if (discover->version != protocol_v2) {
1289                 printf("fallback\n");
1290                 fflush(stdout);
1291                 return -1;
1292         } else {
1293                 /* Stateless Connection established */
1294                 printf("\n");
1295                 fflush(stdout);
1296         }
1297
1298         rpc.service_name = service_name;
1299         rpc.service_url = xstrfmt("%s%s", url.buf, rpc.service_name);
1300         rpc.hdr_content_type = xstrfmt("Content-Type: application/x-%s-request", rpc.service_name);
1301         rpc.hdr_accept = xstrfmt("Accept: application/x-%s-result", rpc.service_name);
1302         if (get_protocol_http_header(discover->version, &buf)) {
1303                 rpc.protocol_header = strbuf_detach(&buf, NULL);
1304         } else {
1305                 rpc.protocol_header = NULL;
1306                 strbuf_release(&buf);
1307         }
1308         rpc.buf = xmalloc(http_post_buffer);
1309         rpc.alloc = http_post_buffer;
1310         rpc.len = 0;
1311         rpc.pos = 0;
1312         rpc.in = 1;
1313         rpc.out = 0;
1314         rpc.any_written = 0;
1315         rpc.gzip_request = 1;
1316         rpc.initial_buffer = 0;
1317         rpc.write_line_lengths = 1;
1318         rpc.flush_read_but_not_sent = 0;
1319
1320         /*
1321          * Dump the capability listing that we got from the server earlier
1322          * during the info/refs request.
1323          */
1324         write_or_die(rpc.in, discover->buf, discover->len);
1325
1326         /* Until we see EOF keep sending POSTs */
1327         while (1) {
1328                 size_t avail;
1329                 enum packet_read_status status;
1330
1331                 if (!rpc_read_from_out(&rpc, PACKET_READ_GENTLE_ON_EOF, &avail,
1332                                        &status))
1333                         BUG("The entire rpc->buf should be larger than LARGE_PACKET_MAX");
1334                 if (status == PACKET_READ_EOF)
1335                         break;
1336                 if (post_rpc(&rpc, status == PACKET_READ_FLUSH))
1337                         /* We would have an err here */
1338                         break;
1339                 /* Reset the buffer for next request */
1340                 rpc.len = 0;
1341         }
1342
1343         free(rpc.service_url);
1344         free(rpc.hdr_content_type);
1345         free(rpc.hdr_accept);
1346         free(rpc.protocol_header);
1347         free(rpc.buf);
1348         strbuf_release(&buf);
1349
1350         return 0;
1351 }
1352
1353 int cmd_main(int argc, const char **argv)
1354 {
1355         struct strbuf buf = STRBUF_INIT;
1356         int nongit;
1357
1358         setup_git_directory_gently(&nongit);
1359         if (argc < 2) {
1360                 error(_("remote-curl: usage: git remote-curl <remote> [<url>]"));
1361                 return 1;
1362         }
1363
1364         options.verbosity = 1;
1365         options.progress = !!isatty(2);
1366         options.thin = 1;
1367         string_list_init(&options.deepen_not, 1);
1368         string_list_init(&options.push_options, 1);
1369
1370         /*
1371          * Just report "remote-curl" here (folding all the various aliases
1372          * ("git-remote-http", "git-remote-https", and etc.) here since they
1373          * are all just copies of the same actual executable.
1374          */
1375         trace2_cmd_name("remote-curl");
1376
1377         remote = remote_get(argv[1]);
1378
1379         if (argc > 2) {
1380                 end_url_with_slash(&url, argv[2]);
1381         } else {
1382                 end_url_with_slash(&url, remote->url[0]);
1383         }
1384
1385         http_init(remote, url.buf, 0);
1386
1387         do {
1388                 const char *arg;
1389
1390                 if (strbuf_getline_lf(&buf, stdin) == EOF) {
1391                         if (ferror(stdin))
1392                                 error(_("remote-curl: error reading command stream from git"));
1393                         return 1;
1394                 }
1395                 if (buf.len == 0)
1396                         break;
1397                 if (starts_with(buf.buf, "fetch ")) {
1398                         if (nongit)
1399                                 die(_("remote-curl: fetch attempted without a local repo"));
1400                         parse_fetch(&buf);
1401
1402                 } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1403                         int for_push = !!strstr(buf.buf + 4, "for-push");
1404                         output_refs(get_refs(for_push));
1405
1406                 } else if (starts_with(buf.buf, "push ")) {
1407                         parse_push(&buf);
1408
1409                 } else if (skip_prefix(buf.buf, "option ", &arg)) {
1410                         char *value = strchr(arg, ' ');
1411                         int result;
1412
1413                         if (value)
1414                                 *value++ = '\0';
1415                         else
1416                                 value = "true";
1417
1418                         result = set_option(arg, value);
1419                         if (!result)
1420                                 printf("ok\n");
1421                         else if (result < 0)
1422                                 printf("error invalid value\n");
1423                         else
1424                                 printf("unsupported\n");
1425                         fflush(stdout);
1426
1427                 } else if (!strcmp(buf.buf, "capabilities")) {
1428                         printf("stateless-connect\n");
1429                         printf("fetch\n");
1430                         printf("option\n");
1431                         printf("push\n");
1432                         printf("check-connectivity\n");
1433                         printf("\n");
1434                         fflush(stdout);
1435                 } else if (skip_prefix(buf.buf, "stateless-connect ", &arg)) {
1436                         if (!stateless_connect(arg))
1437                                 break;
1438                 } else {
1439                         error(_("remote-curl: unknown command '%s' from git"), buf.buf);
1440                         return 1;
1441                 }
1442                 strbuf_reset(&buf);
1443         } while (1);
1444
1445         http_cleanup();
1446
1447         return 0;
1448 }