remote-curl.c

   1 #include "git-compat-util.h"
   2 #include "git-curl-compat.h"
   3 #include "config.h"
   4 #include "environment.h"
   5 #include "gettext.h"
   6 #include "hex.h"
   7 #include "remote.h"
   8 #include "connect.h"
   9 #include "strbuf.h"
  10 #include "walker.h"
  11 #include "http.h"
  12 #include "run-command.h"
  13 #include "pkt-line.h"
  14 #include "string-list.h"
  15 #include "strvec.h"
  16 #include "credential.h"
  17 #include "oid-array.h"
  18 #include "send-pack.h"
  19 #include "setup.h"
  20 #include "protocol.h"
  21 #include "quote.h"
  22 #include "trace2.h"
  23 #include "transport.h"
  24 #include "url.h"
  25 #include "write-or-die.h"
  26
  27 static struct remote *remote;
  28 /* always ends with a trailing slash */
  29 static struct strbuf url = STRBUF_INIT;
  30
  31 struct options {
  32         int verbosity;
  33         unsigned long depth;
  34         char *deepen_since;
  35         struct string_list deepen_not;
  36         struct string_list push_options;
  37         char *filter;
  38         unsigned progress : 1,
  39                 check_self_contained_and_connected : 1,
  40                 cloning : 1,
  41                 update_shallow : 1,
  42                 followtags : 1,
  43                 dry_run : 1,
  44                 thin : 1,
  45                 /* One of the SEND_PACK_PUSH_CERT_* constants. */
  46                 push_cert : 2,
  47                 deepen_relative : 1,
  48
  49                 /* see documentation of corresponding flag in fetch-pack.h */
  50                 from_promisor : 1,
  51
  52                 refetch : 1,
  53                 atomic : 1,
  54                 object_format : 1,
  55                 force_if_includes : 1;
  56         const struct git_hash_algo *hash_algo;
  57 };
  58 static struct options options;
  59 static struct string_list cas_options = STRING_LIST_INIT_DUP;
  60
  61 static int set_option(const char *name, const char *value)
  62 {
  63         if (!strcmp(name, "verbosity")) {
  64                 char *end;
  65                 int v = strtol(value, &end, 10);
  66                 if (value == end || *end)
  67                         return -1;
  68                 options.verbosity = v;
  69                 return 0;
  70         }
  71         else if (!strcmp(name, "progress")) {
  72                 if (!strcmp(value, "true"))
  73                         options.progress = 1;
  74                 else if (!strcmp(value, "false"))
  75                         options.progress = 0;
  76                 else
  77                         return -1;
  78                 return 0;
  79         }
  80         else if (!strcmp(name, "depth")) {
  81                 char *end;
  82                 unsigned long v = strtoul(value, &end, 10);
  83                 if (value == end || *end)
  84                         return -1;
  85                 options.depth = v;
  86                 return 0;
  87         }
  88         else if (!strcmp(name, "deepen-since")) {
  89                 options.deepen_since = xstrdup(value);
  90                 return 0;
  91         }
  92         else if (!strcmp(name, "deepen-not")) {
  93                 string_list_append(&options.deepen_not, value);
  94                 return 0;
  95         }
  96         else if (!strcmp(name, "deepen-relative")) {
  97                 if (!strcmp(value, "true"))
  98                         options.deepen_relative = 1;
  99                 else if (!strcmp(value, "false"))
 100                         options.deepen_relative = 0;
 101                 else
 102                         return -1;
 103                 return 0;
 104         }
 105         else if (!strcmp(name, "followtags")) {
 106                 if (!strcmp(value, "true"))
 107                         options.followtags = 1;
 108                 else if (!strcmp(value, "false"))
 109                         options.followtags = 0;
 110                 else
 111                         return -1;
 112                 return 0;
 113         }
 114         else if (!strcmp(name, "dry-run")) {
 115                 if (!strcmp(value, "true"))
 116                         options.dry_run = 1;
 117                 else if (!strcmp(value, "false"))
 118                         options.dry_run = 0;
 119                 else
 120                         return -1;
 121                 return 0;
 122         }
 123         else if (!strcmp(name, "check-connectivity")) {
 124                 if (!strcmp(value, "true"))
 125                         options.check_self_contained_and_connected = 1;
 126                 else if (!strcmp(value, "false"))
 127                         options.check_self_contained_and_connected = 0;
 128                 else
 129                         return -1;
 130                 return 0;
 131         }
 132         else if (!strcmp(name, "cas")) {
 133                 struct strbuf val = STRBUF_INIT;
 134                 strbuf_addstr(&val, "--force-with-lease=");
 135                 if (*value != '"')
 136                         strbuf_addstr(&val, value);
 137                 else if (unquote_c_style(&val, value, NULL))
 138                         return -1;
 139                 string_list_append(&cas_options, val.buf);
 140                 strbuf_release(&val);
 141                 return 0;
 142         } else if (!strcmp(name, TRANS_OPT_FORCE_IF_INCLUDES)) {
 143                 if (!strcmp(value, "true"))
 144                         options.force_if_includes = 1;
 145                 else if (!strcmp(value, "false"))
 146                         options.force_if_includes = 0;
 147                 else
 148                         return -1;
 149                 return 0;
 150         } else if (!strcmp(name, "cloning")) {
 151                 if (!strcmp(value, "true"))
 152                         options.cloning = 1;
 153                 else if (!strcmp(value, "false"))
 154                         options.cloning = 0;
 155                 else
 156                         return -1;
 157                 return 0;
 158         } else if (!strcmp(name, "update-shallow")) {
 159                 if (!strcmp(value, "true"))
 160                         options.update_shallow = 1;
 161                 else if (!strcmp(value, "false"))
 162                         options.update_shallow = 0;
 163                 else
 164                         return -1;
 165                 return 0;
 166         } else if (!strcmp(name, "pushcert")) {
 167                 if (!strcmp(value, "true"))
 168                         options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 169                 else if (!strcmp(value, "false"))
 170                         options.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 171                 else if (!strcmp(value, "if-asked"))
 172                         options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 173                 else
 174                         return -1;
 175                 return 0;
 176         } else if (!strcmp(name, "atomic")) {
 177                 if (!strcmp(value, "true"))
 178                         options.atomic = 1;
 179                 else if (!strcmp(value, "false"))
 180                         options.atomic = 0;
 181                 else
 182                         return -1;
 183                 return 0;
 184         } else if (!strcmp(name, "push-option")) {
 185                 if (*value != '"')
 186                         string_list_append(&options.push_options, value);
 187                 else {
 188                         struct strbuf unquoted = STRBUF_INIT;
 189                         if (unquote_c_style(&unquoted, value, NULL) < 0)
 190                                 die(_("invalid quoting in push-option value: '%s'"), value);
 191                         string_list_append_nodup(&options.push_options,
 192                                                  strbuf_detach(&unquoted, NULL));
 193                 }
 194                 return 0;
 195         } else if (!strcmp(name, "family")) {
 196                 if (!strcmp(value, "ipv4"))
 197                         git_curl_ipresolve = CURL_IPRESOLVE_V4;
 198                 else if (!strcmp(value, "ipv6"))
 199                         git_curl_ipresolve = CURL_IPRESOLVE_V6;
 200                 else if (!strcmp(value, "all"))
 201                         git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
 202                 else
 203                         return -1;
 204                 return 0;
 205         } else if (!strcmp(name, "from-promisor")) {
 206                 options.from_promisor = 1;
 207                 return 0;
 208         } else if (!strcmp(name, "refetch")) {
 209                 options.refetch = 1;
 210                 return 0;
 211         } else if (!strcmp(name, "filter")) {
 212                 options.filter = xstrdup(value);
 213                 return 0;
 214         } else if (!strcmp(name, "object-format")) {
 215                 options.object_format = 1;
 216                 if (strcmp(value, "true"))
 217                         die(_("unknown value for object-format: %s"), value);
 218                 return 0;
 219         } else {
 220                 return 1 /* unsupported */;
 221         }
 222 }
 223
 224 struct discovery {
 225         char *service;
 226         char *buf_alloc;
 227         char *buf;
 228         size_t len;
 229         struct ref *refs;
 230         struct oid_array shallow;
 231         enum protocol_version version;
 232         unsigned proto_git : 1;
 233 };
 234 static struct discovery *last_discovery;
 235
 236 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 237 {
 238         struct ref *list = NULL;
 239         struct packet_reader reader;
 240
 241         packet_reader_init(&reader, -1, heads->buf, heads->len,
 242                            PACKET_READ_CHOMP_NEWLINE |
 243                            PACKET_READ_GENTLE_ON_EOF |
 244                            PACKET_READ_DIE_ON_ERR_PACKET);
 245
 246         heads->version = discover_version(&reader);
 247         switch (heads->version) {
 248         case protocol_v2:
 249                 /*
 250                  * Do nothing.  This isn't a list of refs but rather a
 251                  * capability advertisement.  Client would have run
 252                  * 'stateless-connect' so we'll dump this capability listing
 253                  * and let them request the refs themselves.
 254                  */
 255                 break;
 256         case protocol_v1:
 257         case protocol_v0:
 258                 get_remote_heads(&reader, &list, for_push ? REF_NORMAL : 0,
 259                                  NULL, &heads->shallow);
 260                 options.hash_algo = reader.hash_algo;
 261                 break;
 262         case protocol_unknown_version:
 263                 BUG("unknown protocol version");
 264         }
 265
 266         return list;
 267 }
 268
 269 static const struct git_hash_algo *detect_hash_algo(struct discovery *heads)
 270 {
 271         const char *p = memchr(heads->buf, '\t', heads->len);
 272         int algo;
 273         if (!p)
 274                 return the_hash_algo;
 275
 276         algo = hash_algo_by_length((p - heads->buf) / 2);
 277         if (algo == GIT_HASH_UNKNOWN)
 278                 return NULL;
 279         return &hash_algos[algo];
 280 }
 281
 282 static struct ref *parse_info_refs(struct discovery *heads)
 283 {
 284         char *data, *start, *mid;
 285         char *ref_name;
 286         int i = 0;
 287
 288         struct ref *refs = NULL;
 289         struct ref *ref = NULL;
 290         struct ref *last_ref = NULL;
 291
 292         options.hash_algo = detect_hash_algo(heads);
 293         if (!options.hash_algo)
 294                 die("%sinfo/refs not valid: could not determine hash algorithm; "
 295                     "is this a git repository?",
 296                     transport_anonymize_url(url.buf));
 297
 298         data = heads->buf;
 299         start = NULL;
 300         mid = data;
 301         while (i < heads->len) {
 302                 if (!start) {
 303                         start = &data[i];
 304                 }
 305                 if (data[i] == '\t')
 306                         mid = &data[i];
 307                 if (data[i] == '\n') {
 308                         if (mid - start != options.hash_algo->hexsz)
 309                                 die(_("%sinfo/refs not valid: is this a git repository?"),
 310                                     transport_anonymize_url(url.buf));
 311                         data[i] = 0;
 312                         ref_name = mid + 1;
 313                         ref = alloc_ref(ref_name);
 314                         get_oid_hex_algop(start, &ref->old_oid, options.hash_algo);
 315                         if (!refs)
 316                                 refs = ref;
 317                         if (last_ref)
 318                                 last_ref->next = ref;
 319                         last_ref = ref;
 320                         start = NULL;
 321                 }
 322                 i++;
 323         }
 324
 325         ref = alloc_ref("HEAD");
 326         if (!http_fetch_ref(url.buf, ref) &&
 327             !resolve_remote_symref(ref, refs)) {
 328                 ref->next = refs;
 329                 refs = ref;
 330         } else {
 331                 free(ref);
 332         }
 333
 334         return refs;
 335 }
 336
 337 static void free_discovery(struct discovery *d)
 338 {
 339         if (d) {
 340                 if (d == last_discovery)
 341                         last_discovery = NULL;
 342                 free(d->shallow.oid);
 343                 free(d->buf_alloc);
 344                 free_refs(d->refs);
 345                 free(d->service);
 346                 free(d);
 347         }
 348 }
 349
 350 static int show_http_message(struct strbuf *type, struct strbuf *charset,
 351                              struct strbuf *msg)
 352 {
 353         const char *p, *eol;
 354
 355         /*
 356          * We only show text/plain parts, as other types are likely
 357          * to be ugly to look at on the user's terminal.
 358          */
 359         if (strcmp(type->buf, "text/plain"))
 360                 return -1;
 361         if (charset->len)
 362                 strbuf_reencode(msg, charset->buf, get_log_output_encoding());
 363
 364         strbuf_trim(msg);
 365         if (!msg->len)
 366                 return -1;
 367
 368         p = msg->buf;
 369         do {
 370                 eol = strchrnul(p, '\n');
 371                 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 372                 p = eol + 1;
 373         } while(*eol);
 374         return 0;
 375 }
 376
 377 static int get_protocol_http_header(enum protocol_version version,
 378                                     struct strbuf *header)
 379 {
 380         if (version > 0) {
 381                 strbuf_addf(header, GIT_PROTOCOL_HEADER ": version=%d",
 382                             version);
 383
 384                 return 1;
 385         }
 386
 387         return 0;
 388 }
 389
 390 static void check_smart_http(struct discovery *d, const char *service,
 391                              struct strbuf *type)
 392 {
 393         const char *p;
 394         struct packet_reader reader;
 395
 396         /*
 397          * If we don't see x-$service-advertisement, then it's not smart-http.
 398          * But once we do, we commit to it and assume any other protocol
 399          * violations are hard errors.
 400          */
 401         if (!skip_prefix(type->buf, "application/x-", &p) ||
 402             !skip_prefix(p, service, &p) ||
 403             strcmp(p, "-advertisement"))
 404                 return;
 405
 406         packet_reader_init(&reader, -1, d->buf, d->len,
 407                            PACKET_READ_CHOMP_NEWLINE |
 408                            PACKET_READ_DIE_ON_ERR_PACKET);
 409         if (packet_reader_read(&reader) != PACKET_READ_NORMAL)
 410                 die(_("invalid server response; expected service, got flush packet"));
 411
 412         if (skip_prefix(reader.line, "# service=", &p) && !strcmp(p, service)) {
 413                 /*
 414                  * The header can include additional metadata lines, up
 415                  * until a packet flush marker.  Ignore these now, but
 416                  * in the future we might start to scan them.
 417                  */
 418                 for (;;) {
 419                         packet_reader_read(&reader);
 420                         if (reader.pktlen <= 0) {
 421                                 break;
 422                         }
 423                 }
 424
 425                 /*
 426                  * v0 smart http; callers expect us to soak up the
 427                  * service and header packets
 428                  */
 429                 d->buf = reader.src_buffer;
 430                 d->len = reader.src_len;
 431                 d->proto_git = 1;
 432
 433         } else if (!strcmp(reader.line, "version 2")) {
 434                 /*
 435                  * v2 smart http; do not consume version packet, which will
 436                  * be handled elsewhere.
 437                  */
 438                 d->proto_git = 1;
 439
 440         } else {
 441                 die(_("invalid server response; got '%s'"), reader.line);
 442         }
 443 }
 444
 445 static struct discovery *discover_refs(const char *service, int for_push)
 446 {
 447         struct strbuf type = STRBUF_INIT;
 448         struct strbuf charset = STRBUF_INIT;
 449         struct strbuf buffer = STRBUF_INIT;
 450         struct strbuf refs_url = STRBUF_INIT;
 451         struct strbuf effective_url = STRBUF_INIT;
 452         struct strbuf protocol_header = STRBUF_INIT;
 453         struct string_list extra_headers = STRING_LIST_INIT_DUP;
 454         struct discovery *last = last_discovery;
 455         int http_ret, maybe_smart = 0;
 456         struct http_get_options http_options;
 457         enum protocol_version version = get_protocol_version_config();
 458
 459         if (last && !strcmp(service, last->service))
 460                 return last;
 461         free_discovery(last);
 462
 463         strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 464         if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 465              git_env_bool("GIT_SMART_HTTP", 1)) {
 466                 maybe_smart = 1;
 467                 if (!strchr(url.buf, '?'))
 468                         strbuf_addch(&refs_url, '?');
 469                 else
 470                         strbuf_addch(&refs_url, '&');
 471                 strbuf_addf(&refs_url, "service=%s", service);
 472         }
 473
 474         /*
 475          * NEEDSWORK: If we are trying to use protocol v2 and we are planning
 476          * to perform any operation that doesn't involve upload-pack (i.e., a
 477          * fetch, ls-remote, etc), then fallback to v0 since we don't know how
 478          * to do anything else (like push or remote archive) via v2.
 479          */
 480         if (version == protocol_v2 && strcmp("git-upload-pack", service))
 481                 version = protocol_v0;
 482
 483         /* Add the extra Git-Protocol header */
 484         if (get_protocol_http_header(version, &protocol_header))
 485                 string_list_append(&extra_headers, protocol_header.buf);
 486
 487         memset(&http_options, 0, sizeof(http_options));
 488         http_options.content_type = &type;
 489         http_options.charset = &charset;
 490         http_options.effective_url = &effective_url;
 491         http_options.base_url = &url;
 492         http_options.extra_headers = &extra_headers;
 493         http_options.initial_request = 1;
 494         http_options.no_cache = 1;
 495
 496         http_ret = http_get_strbuf(refs_url.buf, &buffer, &http_options);
 497         switch (http_ret) {
 498         case HTTP_OK:
 499                 break;
 500         case HTTP_MISSING_TARGET:
 501                 show_http_message(&type, &charset, &buffer);
 502                 die(_("repository '%s' not found"),
 503                     transport_anonymize_url(url.buf));
 504         case HTTP_NOAUTH:
 505                 show_http_message(&type, &charset, &buffer);
 506                 die(_("Authentication failed for '%s'"),
 507                     transport_anonymize_url(url.buf));
 508         case HTTP_NOMATCHPUBLICKEY:
 509                 show_http_message(&type, &charset, &buffer);
 510                 die(_("unable to access '%s' with http.pinnedPubkey configuration: %s"),
 511                     transport_anonymize_url(url.buf), curl_errorstr);
 512         default:
 513                 show_http_message(&type, &charset, &buffer);
 514                 die(_("unable to access '%s': %s"),
 515                     transport_anonymize_url(url.buf), curl_errorstr);
 516         }
 517
 518         if (options.verbosity && !starts_with(refs_url.buf, url.buf)) {
 519                 char *u = transport_anonymize_url(url.buf);
 520                 warning(_("redirecting to %s"), u);
 521                 free(u);
 522         }
 523
 524         last= xcalloc(1, sizeof(*last_discovery));
 525         last->service = xstrdup(service);
 526         last->buf_alloc = strbuf_detach(&buffer, &last->len);
 527         last->buf = last->buf_alloc;
 528
 529         if (maybe_smart)
 530                 check_smart_http(last, service, &type);
 531
 532         if (last->proto_git)
 533                 last->refs = parse_git_refs(last, for_push);
 534         else
 535                 last->refs = parse_info_refs(last);
 536
 537         strbuf_release(&refs_url);
 538         strbuf_release(&type);
 539         strbuf_release(&charset);
 540         strbuf_release(&effective_url);
 541         strbuf_release(&buffer);
 542         strbuf_release(&protocol_header);
 543         string_list_clear(&extra_headers, 0);
 544         last_discovery = last;
 545         return last;
 546 }
 547
 548 static struct ref *get_refs(int for_push)
 549 {
 550         struct discovery *heads;
 551
 552         if (for_push)
 553                 heads = discover_refs("git-receive-pack", for_push);
 554         else
 555                 heads = discover_refs("git-upload-pack", for_push);
 556
 557         return heads->refs;
 558 }
 559
 560 static void output_refs(struct ref *refs)
 561 {
 562         struct ref *posn;
 563         if (options.object_format && options.hash_algo) {
 564                 printf(":object-format %s\n", options.hash_algo->name);
 565                 repo_set_hash_algo(the_repository,
 566                                 hash_algo_by_ptr(options.hash_algo));
 567         }
 568         for (posn = refs; posn; posn = posn->next) {
 569                 if (posn->symref)
 570                         printf("@%s %s\n", posn->symref, posn->name);
 571                 else
 572                         printf("%s %s\n", hash_to_hex_algop(posn->old_oid.hash,
 573                                                             options.hash_algo),
 574                                           posn->name);
 575         }
 576         printf("\n");
 577         fflush(stdout);
 578 }
 579
 580 struct rpc_state {
 581         const char *service_name;
 582         char *service_url;
 583         char *hdr_content_type;
 584         char *hdr_accept;
 585         char *hdr_accept_language;
 586         char *protocol_header;
 587         char *buf;
 588         size_t alloc;
 589         size_t len;
 590         size_t pos;
 591         int in;
 592         int out;
 593         int any_written;
 594         unsigned gzip_request : 1;
 595         unsigned initial_buffer : 1;
 596
 597         /*
 598          * Whenever a pkt-line is read into buf, append the 4 characters
 599          * denoting its length before appending the payload.
 600          */
 601         unsigned write_line_lengths : 1;
 602
 603         /*
 604          * Used by rpc_out; initialize to 0. This is true if a flush has been
 605          * read, but the corresponding line length (if write_line_lengths is
 606          * true) and EOF have not been sent to libcurl. Since each flush marks
 607          * the end of a request, each flush must be completely sent before any
 608          * further reading occurs.
 609          */
 610         unsigned flush_read_but_not_sent : 1;
 611 };
 612
 613 #define RPC_STATE_INIT { 0 }
 614
 615 /*
 616  * Appends the result of reading from rpc->out to the string represented by
 617  * rpc->buf and rpc->len if there is enough space. Returns 1 if there was
 618  * enough space, 0 otherwise.
 619  *
 620  * If rpc->write_line_lengths is true, appends the line length as a 4-byte
 621  * hexadecimal string before appending the result described above.
 622  *
 623  * Writes the total number of bytes appended into appended.
 624  */
 625 static int rpc_read_from_out(struct rpc_state *rpc, int options,
 626                              size_t *appended,
 627                              enum packet_read_status *status) {
 628         size_t left;
 629         char *buf;
 630         int pktlen_raw;
 631
 632         if (rpc->write_line_lengths) {
 633                 left = rpc->alloc - rpc->len - 4;
 634                 buf = rpc->buf + rpc->len + 4;
 635         } else {
 636                 left = rpc->alloc - rpc->len;
 637                 buf = rpc->buf + rpc->len;
 638         }
 639
 640         if (left < LARGE_PACKET_MAX)
 641                 return 0;
 642
 643         *status = packet_read_with_status(rpc->out, NULL, NULL, buf,
 644                         left, &pktlen_raw, options);
 645         if (*status != PACKET_READ_EOF) {
 646                 *appended = pktlen_raw + (rpc->write_line_lengths ? 4 : 0);
 647                 rpc->len += *appended;
 648         }
 649
 650         if (rpc->write_line_lengths) {
 651                 switch (*status) {
 652                 case PACKET_READ_EOF:
 653                         if (!(options & PACKET_READ_GENTLE_ON_EOF))
 654                                 die(_("shouldn't have EOF when not gentle on EOF"));
 655                         break;
 656                 case PACKET_READ_NORMAL:
 657                         set_packet_header(buf - 4, *appended);
 658                         break;
 659                 case PACKET_READ_DELIM:
 660                         memcpy(buf - 4, "0001", 4);
 661                         break;
 662                 case PACKET_READ_FLUSH:
 663                         memcpy(buf - 4, "0000", 4);
 664                         break;
 665                 case PACKET_READ_RESPONSE_END:
 666                         die(_("remote server sent unexpected response end packet"));
 667                 }
 668         }
 669
 670         return 1;
 671 }
 672
 673 static size_t rpc_out(void *ptr, size_t eltsize,
 674                 size_t nmemb, void *buffer_)
 675 {
 676         size_t max = eltsize * nmemb;
 677         struct rpc_state *rpc = buffer_;
 678         size_t avail = rpc->len - rpc->pos;
 679         enum packet_read_status status;
 680
 681         if (!avail) {
 682                 rpc->initial_buffer = 0;
 683                 rpc->len = 0;
 684                 rpc->pos = 0;
 685                 if (!rpc->flush_read_but_not_sent) {
 686                         if (!rpc_read_from_out(rpc, 0, &avail, &status))
 687                                 BUG("The entire rpc->buf should be larger than LARGE_PACKET_MAX");
 688                         if (status == PACKET_READ_FLUSH)
 689                                 rpc->flush_read_but_not_sent = 1;
 690                 }
 691                 /*
 692                  * If flush_read_but_not_sent is true, we have already read one
 693                  * full request but have not fully sent it + EOF, which is why
 694                  * we need to refrain from reading.
 695                  */
 696         }
 697         if (rpc->flush_read_but_not_sent) {
 698                 if (!avail) {
 699                         /*
 700                          * The line length either does not need to be sent at
 701                          * all or has already been completely sent. Now we can
 702                          * return 0, indicating EOF, meaning that the flush has
 703                          * been fully sent.
 704                          */
 705                         rpc->flush_read_but_not_sent = 0;
 706                         return 0;
 707                 }
 708                 /*
 709                  * If avail is non-zero, the line length for the flush still
 710                  * hasn't been fully sent. Proceed with sending the line
 711                  * length.
 712                  */
 713         }
 714
 715         if (max < avail)
 716                 avail = max;
 717         memcpy(ptr, rpc->buf + rpc->pos, avail);
 718         rpc->pos += avail;
 719         return avail;
 720 }
 721
 722 static int rpc_seek(void *clientp, curl_off_t offset, int origin)
 723 {
 724         struct rpc_state *rpc = clientp;
 725
 726         if (origin != SEEK_SET)
 727                 BUG("rpc_seek only handles SEEK_SET, not %d", origin);
 728
 729         if (rpc->initial_buffer) {
 730                 if (offset < 0 || offset > rpc->len) {
 731                         error("curl seek would be outside of rpc buffer");
 732                         return CURL_SEEKFUNC_FAIL;
 733                 }
 734                 rpc->pos = offset;
 735                 return CURL_SEEKFUNC_OK;
 736         }
 737         error(_("unable to rewind rpc post data - try increasing http.postBuffer"));
 738         return CURL_SEEKFUNC_FAIL;
 739 }
 740
 741 struct check_pktline_state {
 742         char len_buf[4];
 743         int len_filled;
 744         int remaining;
 745 };
 746
 747 static void check_pktline(struct check_pktline_state *state, const char *ptr, size_t size)
 748 {
 749         while (size) {
 750                 if (!state->remaining) {
 751                         int digits_remaining = 4 - state->len_filled;
 752                         if (digits_remaining > size)
 753                                 digits_remaining = size;
 754                         memcpy(&state->len_buf[state->len_filled], ptr, digits_remaining);
 755                         state->len_filled += digits_remaining;
 756                         ptr += digits_remaining;
 757                         size -= digits_remaining;
 758
 759                         if (state->len_filled == 4) {
 760                                 state->remaining = packet_length(state->len_buf,
 761                                                                  sizeof(state->len_buf));
 762                                 if (state->remaining < 0) {
 763                                         die(_("remote-curl: bad line length character: %.4s"), state->len_buf);
 764                                 } else if (state->remaining == 2) {
 765                                         die(_("remote-curl: unexpected response end packet"));
 766                                 } else if (state->remaining < 4) {
 767                                         state->remaining = 0;
 768                                 } else {
 769                                         state->remaining -= 4;
 770                                 }
 771                                 state->len_filled = 0;
 772                         }
 773                 }
 774
 775                 if (state->remaining) {
 776                         int remaining = state->remaining;
 777                         if (remaining > size)
 778                                 remaining = size;
 779                         ptr += remaining;
 780                         size -= remaining;
 781                         state->remaining -= remaining;
 782                 }
 783         }
 784 }
 785
 786 struct rpc_in_data {
 787         struct rpc_state *rpc;
 788         struct active_request_slot *slot;
 789         int check_pktline;
 790         struct check_pktline_state pktline_state;
 791 };
 792
 793 /*
 794  * A callback for CURLOPT_WRITEFUNCTION. The return value is the bytes consumed
 795  * from ptr.
 796  */
 797 static size_t rpc_in(char *ptr, size_t eltsize,
 798                 size_t nmemb, void *buffer_)
 799 {
 800         size_t size = eltsize * nmemb;
 801         struct rpc_in_data *data = buffer_;
 802         long response_code;
 803
 804         if (curl_easy_getinfo(data->slot->curl, CURLINFO_RESPONSE_CODE,
 805                               &response_code) != CURLE_OK)
 806                 return size;
 807         if (response_code >= 300)
 808                 return size;
 809         if (size)
 810                 data->rpc->any_written = 1;
 811         if (data->check_pktline)
 812                 check_pktline(&data->pktline_state, ptr, size);
 813         write_or_die(data->rpc->in, ptr, size);
 814         return size;
 815 }
 816
 817 static int run_slot(struct active_request_slot *slot,
 818                     struct slot_results *results)
 819 {
 820         int err;
 821         struct slot_results results_buf;
 822
 823         if (!results)
 824                 results = &results_buf;
 825
 826         err = run_one_slot(slot, results);
 827
 828         if (err != HTTP_OK && err != HTTP_REAUTH) {
 829                 struct strbuf msg = STRBUF_INIT;
 830                 if (results->http_code && results->http_code != 200)
 831                         strbuf_addf(&msg, "HTTP %ld", results->http_code);
 832                 if (results->curl_result != CURLE_OK) {
 833                         if (msg.len)
 834                                 strbuf_addch(&msg, ' ');
 835                         strbuf_addf(&msg, "curl %d", results->curl_result);
 836                         if (curl_errorstr[0]) {
 837                                 strbuf_addch(&msg, ' ');
 838                                 strbuf_addstr(&msg, curl_errorstr);
 839                         }
 840                 }
 841                 error(_("RPC failed; %s"), msg.buf);
 842                 strbuf_release(&msg);
 843         }
 844
 845         return err;
 846 }
 847
 848 static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 849 {
 850         struct active_request_slot *slot;
 851         struct curl_slist *headers = http_copy_default_headers();
 852         struct strbuf buf = STRBUF_INIT;
 853         int err;
 854
 855         slot = get_active_slot();
 856
 857         headers = curl_slist_append(headers, rpc->hdr_content_type);
 858         headers = curl_slist_append(headers, rpc->hdr_accept);
 859
 860         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 861         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 862         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 863         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 864         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 865         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 866         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 867         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 868         curl_easy_setopt(slot->curl, CURLOPT_WRITEDATA, &buf);
 869
 870         err = run_slot(slot, results);
 871
 872         curl_slist_free_all(headers);
 873         strbuf_release(&buf);
 874         return err;
 875 }
 876
 877 static curl_off_t xcurl_off_t(size_t len)
 878 {
 879         uintmax_t size = len;
 880         if (size > maximum_signed_value_of_type(curl_off_t))
 881                 die(_("cannot handle pushes this big"));
 882         return (curl_off_t)size;
 883 }
 884
 885 /*
 886  * If flush_received is true, do not attempt to read any more; just use what's
 887  * in rpc->buf.
 888  */
 889 static int post_rpc(struct rpc_state *rpc, int stateless_connect, int flush_received)
 890 {
 891         struct active_request_slot *slot;
 892         struct curl_slist *headers = http_copy_default_headers();
 893         int use_gzip = rpc->gzip_request;
 894         char *gzip_body = NULL;
 895         size_t gzip_size = 0;
 896         int err, large_request = 0;
 897         int needs_100_continue = 0;
 898         struct rpc_in_data rpc_in_data;
 899
 900         /* Try to load the entire request, if we can fit it into the
 901          * allocated buffer space we can use HTTP/1.0 and avoid the
 902          * chunked encoding mess.
 903          */
 904         if (!flush_received) {
 905                 while (1) {
 906                         size_t n;
 907                         enum packet_read_status status;
 908
 909                         if (!rpc_read_from_out(rpc, 0, &n, &status)) {
 910                                 large_request = 1;
 911                                 use_gzip = 0;
 912                                 break;
 913                         }
 914                         if (status == PACKET_READ_FLUSH)
 915                                 break;
 916                 }
 917         }
 918
 919         if (large_request) {
 920                 struct slot_results results;
 921
 922                 do {
 923                         err = probe_rpc(rpc, &results);
 924                         if (err == HTTP_REAUTH)
 925                                 credential_fill(&http_auth);
 926                 } while (err == HTTP_REAUTH);
 927                 if (err != HTTP_OK)
 928                         return -1;
 929
 930                 if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 931                         needs_100_continue = 1;
 932         }
 933
 934         headers = curl_slist_append(headers, rpc->hdr_content_type);
 935         headers = curl_slist_append(headers, rpc->hdr_accept);
 936         headers = curl_slist_append(headers, needs_100_continue ?
 937                 "Expect: 100-continue" : "Expect:");
 938
 939         /* Add Accept-Language header */
 940         if (rpc->hdr_accept_language)
 941                 headers = curl_slist_append(headers, rpc->hdr_accept_language);
 942
 943         /* Add the extra Git-Protocol header */
 944         if (rpc->protocol_header)
 945                 headers = curl_slist_append(headers, rpc->protocol_header);
 946
 947 retry:
 948         slot = get_active_slot();
 949
 950         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 951         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 952         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 953         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 954
 955         if (large_request) {
 956                 /* The request body is large and the size cannot be predicted.
 957                  * We must use chunked encoding to send it.
 958                  */
 959 #ifdef GIT_CURL_NEED_TRANSFER_ENCODING_HEADER
 960                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 961 #endif
 962                 rpc->initial_buffer = 1;
 963                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 964                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 965                 curl_easy_setopt(slot->curl, CURLOPT_SEEKFUNCTION, rpc_seek);
 966                 curl_easy_setopt(slot->curl, CURLOPT_SEEKDATA, rpc);
 967                 if (options.verbosity > 1) {
 968                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 969                         fflush(stderr);
 970                 }
 971
 972         } else if (gzip_body) {
 973                 /*
 974                  * If we are looping to retry authentication, then the previous
 975                  * run will have set up the headers and gzip buffer already,
 976                  * and we just need to send it.
 977                  */
 978                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 979                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 980
 981         } else if (use_gzip && 1024 < rpc->len) {
 982                 /* The client backend isn't giving us compressed data so
 983                  * we can try to deflate it ourselves, this may save on
 984                  * the transfer time.
 985                  */
 986                 git_zstream stream;
 987                 int ret;
 988
 989                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 990                 gzip_size = git_deflate_bound(&stream, rpc->len);
 991                 gzip_body = xmalloc(gzip_size);
 992
 993                 stream.next_in = (unsigned char *)rpc->buf;
 994                 stream.avail_in = rpc->len;
 995                 stream.next_out = (unsigned char *)gzip_body;
 996                 stream.avail_out = gzip_size;
 997
 998                 ret = git_deflate(&stream, Z_FINISH);
 999                 if (ret != Z_STREAM_END)
1000                         die(_("cannot deflate request; zlib deflate error %d"), ret);
1001
1002                 ret = git_deflate_end_gently(&stream);
1003                 if (ret != Z_OK)
1004                         die(_("cannot deflate request; zlib end error %d"), ret);
1005
1006                 gzip_size = stream.total_out;
1007
1008                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
1009                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
1010                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
1011
1012                 if (options.verbosity > 1) {
1013                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
1014                                 rpc->service_name,
1015                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
1016                         fflush(stderr);
1017                 }
1018         } else {
1019                 /* We know the complete request size in advance, use the
1020                  * more normal Content-Length approach.
1021                  */
1022                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
1023                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(rpc->len));
1024                 if (options.verbosity > 1) {
1025                         fprintf(stderr, "POST %s (%lu bytes)\n",
1026                                 rpc->service_name, (unsigned long)rpc->len);
1027                         fflush(stderr);
1028                 }
1029         }
1030
1031         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1032         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
1033         rpc_in_data.rpc = rpc;
1034         rpc_in_data.slot = slot;
1035         rpc_in_data.check_pktline = stateless_connect;
1036         memset(&rpc_in_data.pktline_state, 0, sizeof(rpc_in_data.pktline_state));
1037         curl_easy_setopt(slot->curl, CURLOPT_WRITEDATA, &rpc_in_data);
1038         curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1039
1040
1041         rpc->any_written = 0;
1042         err = run_slot(slot, NULL);
1043         if (err == HTTP_REAUTH && !large_request) {
1044                 credential_fill(&http_auth);
1045                 goto retry;
1046         }
1047         if (err != HTTP_OK)
1048                 err = -1;
1049
1050         if (!rpc->any_written)
1051                 err = -1;
1052
1053         if (rpc_in_data.pktline_state.len_filled)
1054                 err = error(_("%d bytes of length header were received"), rpc_in_data.pktline_state.len_filled);
1055         if (rpc_in_data.pktline_state.remaining)
1056                 err = error(_("%d bytes of body are still expected"), rpc_in_data.pktline_state.remaining);
1057
1058         if (stateless_connect)
1059                 packet_response_end(rpc->in);
1060
1061         curl_slist_free_all(headers);
1062         free(gzip_body);
1063         return err;
1064 }
1065
1066 static int rpc_service(struct rpc_state *rpc, struct discovery *heads,
1067                        const char **client_argv, const struct strbuf *preamble,
1068                        struct strbuf *rpc_result)
1069 {
1070         const char *svc = rpc->service_name;
1071         struct strbuf buf = STRBUF_INIT;
1072         struct child_process client = CHILD_PROCESS_INIT;
1073         int err = 0;
1074
1075         client.in = -1;
1076         client.out = -1;
1077         client.git_cmd = 1;
1078         strvec_pushv(&client.args, client_argv);
1079         if (start_command(&client))
1080                 exit(1);
1081         write_or_die(client.in, preamble->buf, preamble->len);
1082         if (heads)
1083                 write_or_die(client.in, heads->buf, heads->len);
1084
1085         rpc->alloc = http_post_buffer;
1086         rpc->buf = xmalloc(rpc->alloc);
1087         rpc->in = client.in;
1088         rpc->out = client.out;
1089
1090         strbuf_addf(&buf, "%s%s", url.buf, svc);
1091         rpc->service_url = strbuf_detach(&buf, NULL);
1092
1093         rpc->hdr_accept_language = xstrdup_or_null(http_get_accept_language_header());
1094
1095         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
1096         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
1097
1098         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
1099         rpc->hdr_accept = strbuf_detach(&buf, NULL);
1100
1101         if (get_protocol_http_header(heads->version, &buf))
1102                 rpc->protocol_header = strbuf_detach(&buf, NULL);
1103         else
1104                 rpc->protocol_header = NULL;
1105
1106         while (!err) {
1107                 int n = packet_read(rpc->out, rpc->buf, rpc->alloc, 0);
1108                 if (!n)
1109                         break;
1110                 rpc->pos = 0;
1111                 rpc->len = n;
1112                 err |= post_rpc(rpc, 0, 0);
1113         }
1114
1115         close(client.in);
1116         client.in = -1;
1117         if (!err) {
1118                 strbuf_read(rpc_result, client.out, 0);
1119         } else {
1120                 char buf[4096];
1121                 for (;;)
1122                         if (xread(client.out, buf, sizeof(buf)) <= 0)
1123                                 break;
1124         }
1125
1126         close(client.out);
1127         client.out = -1;
1128
1129         err |= finish_command(&client);
1130         free(rpc->service_url);
1131         free(rpc->hdr_content_type);
1132         free(rpc->hdr_accept);
1133         free(rpc->hdr_accept_language);
1134         free(rpc->protocol_header);
1135         free(rpc->buf);
1136         strbuf_release(&buf);
1137         return err;
1138 }
1139
1140 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
1141 {
1142         struct walker *walker;
1143         char **targets;
1144         int ret, i;
1145
1146         ALLOC_ARRAY(targets, nr_heads);
1147         if (options.depth || options.deepen_since)
1148                 die(_("dumb http transport does not support shallow capabilities"));
1149         for (i = 0; i < nr_heads; i++)
1150                 targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
1151
1152         walker = get_http_walker(url.buf);
1153         walker->get_verbosely = options.verbosity >= 3;
1154         walker->get_progress = options.progress;
1155         walker->get_recover = 0;
1156         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
1157         walker_free(walker);
1158
1159         for (i = 0; i < nr_heads; i++)
1160                 free(targets[i]);
1161         free(targets);
1162
1163         return ret ? error(_("fetch failed.")) : 0;
1164 }
1165
1166 static int fetch_git(struct discovery *heads,
1167         int nr_heads, struct ref **to_fetch)
1168 {
1169         struct rpc_state rpc = RPC_STATE_INIT;
1170         struct strbuf preamble = STRBUF_INIT;
1171         int i, err;
1172         struct strvec args = STRVEC_INIT;
1173         struct strbuf rpc_result = STRBUF_INIT;
1174
1175         strvec_pushl(&args, "fetch-pack", "--stateless-rpc",
1176                      "--stdin", "--lock-pack", NULL);
1177         if (options.followtags)
1178                 strvec_push(&args, "--include-tag");
1179         if (options.thin)
1180                 strvec_push(&args, "--thin");
1181         if (options.verbosity >= 3)
1182                 strvec_pushl(&args, "-v", "-v", NULL);
1183         if (options.check_self_contained_and_connected)
1184                 strvec_push(&args, "--check-self-contained-and-connected");
1185         if (options.cloning)
1186                 strvec_push(&args, "--cloning");
1187         if (options.update_shallow)
1188                 strvec_push(&args, "--update-shallow");
1189         if (!options.progress)
1190                 strvec_push(&args, "--no-progress");
1191         if (options.depth)
1192                 strvec_pushf(&args, "--depth=%lu", options.depth);
1193         if (options.deepen_since)
1194                 strvec_pushf(&args, "--shallow-since=%s", options.deepen_since);
1195         for (i = 0; i < options.deepen_not.nr; i++)
1196                 strvec_pushf(&args, "--shallow-exclude=%s",
1197                              options.deepen_not.items[i].string);
1198         if (options.deepen_relative && options.depth)
1199                 strvec_push(&args, "--deepen-relative");
1200         if (options.from_promisor)
1201                 strvec_push(&args, "--from-promisor");
1202         if (options.refetch)
1203                 strvec_push(&args, "--refetch");
1204         if (options.filter)
1205                 strvec_pushf(&args, "--filter=%s", options.filter);
1206         strvec_push(&args, url.buf);
1207
1208         for (i = 0; i < nr_heads; i++) {
1209                 struct ref *ref = to_fetch[i];
1210                 if (!*ref->name)
1211                         die(_("cannot fetch by sha1 over smart http"));
1212                 packet_buf_write(&preamble, "%s %s\n",
1213                                  oid_to_hex(&ref->old_oid), ref->name);
1214         }
1215         packet_buf_flush(&preamble);
1216
1217         memset(&rpc, 0, sizeof(rpc));
1218         rpc.service_name = "git-upload-pack",
1219         rpc.gzip_request = 1;
1220
1221         err = rpc_service(&rpc, heads, args.v, &preamble, &rpc_result);
1222         if (rpc_result.len)
1223                 write_or_die(1, rpc_result.buf, rpc_result.len);
1224         strbuf_release(&rpc_result);
1225         strbuf_release(&preamble);
1226         strvec_clear(&args);
1227         return err;
1228 }
1229
1230 static int fetch(int nr_heads, struct ref **to_fetch)
1231 {
1232         struct discovery *d = discover_refs("git-upload-pack", 0);
1233         if (d->proto_git)
1234                 return fetch_git(d, nr_heads, to_fetch);
1235         else
1236                 return fetch_dumb(nr_heads, to_fetch);
1237 }
1238
1239 static void parse_fetch(struct strbuf *buf)
1240 {
1241         struct ref **to_fetch = NULL;
1242         struct ref *list_head = NULL;
1243         struct ref **list = &list_head;
1244         int alloc_heads = 0, nr_heads = 0;
1245
1246         do {
1247                 const char *p;
1248                 if (skip_prefix(buf->buf, "fetch ", &p)) {
1249                         const char *name;
1250                         struct ref *ref;
1251                         struct object_id old_oid;
1252                         const char *q;
1253
1254                         if (parse_oid_hex(p, &old_oid, &q))
1255                                 die(_("protocol error: expected sha/ref, got '%s'"), p);
1256                         if (*q == ' ')
1257                                 name = q + 1;
1258                         else if (!*q)
1259                                 name = "";
1260                         else
1261                                 die(_("protocol error: expected sha/ref, got '%s'"), p);
1262
1263                         ref = alloc_ref(name);
1264                         oidcpy(&ref->old_oid, &old_oid);
1265
1266                         *list = ref;
1267                         list = &ref->next;
1268
1269                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
1270                         to_fetch[nr_heads++] = ref;
1271                 }
1272                 else
1273                         die(_("http transport does not support %s"), buf->buf);
1274
1275                 strbuf_reset(buf);
1276                 if (strbuf_getline_lf(buf, stdin) == EOF)
1277                         return;
1278                 if (!*buf->buf)
1279                         break;
1280         } while (1);
1281
1282         if (fetch(nr_heads, to_fetch))
1283                 exit(128); /* error already reported */
1284         free_refs(list_head);
1285         free(to_fetch);
1286
1287         printf("\n");
1288         fflush(stdout);
1289         strbuf_reset(buf);
1290 }
1291
1292 static void parse_get(const char *arg)
1293 {
1294         struct strbuf url = STRBUF_INIT;
1295         struct strbuf path = STRBUF_INIT;
1296         const char *space;
1297
1298         space = strchr(arg, ' ');
1299
1300         if (!space)
1301                 die(_("protocol error: expected '<url> <path>', missing space"));
1302
1303         strbuf_add(&url, arg, space - arg);
1304         strbuf_addstr(&path, space + 1);
1305
1306         if (http_get_file(url.buf, path.buf, NULL))
1307                 die(_("failed to download file at URL '%s'"), url.buf);
1308
1309         strbuf_release(&url);
1310         strbuf_release(&path);
1311         printf("\n");
1312         fflush(stdout);
1313 }
1314
1315 static int push_dav(int nr_spec, const char **specs)
1316 {
1317         struct child_process child = CHILD_PROCESS_INIT;
1318         size_t i;
1319
1320         child.git_cmd = 1;
1321         strvec_push(&child.args, "http-push");
1322         strvec_push(&child.args, "--helper-status");
1323         if (options.dry_run)
1324                 strvec_push(&child.args, "--dry-run");
1325         if (options.verbosity > 1)
1326                 strvec_push(&child.args, "--verbose");
1327         strvec_push(&child.args, url.buf);
1328         for (i = 0; i < nr_spec; i++)
1329                 strvec_push(&child.args, specs[i]);
1330
1331         if (run_command(&child))
1332                 die(_("git-http-push failed"));
1333         return 0;
1334 }
1335
1336 static int push_git(struct discovery *heads, int nr_spec, const char **specs)
1337 {
1338         struct rpc_state rpc = RPC_STATE_INIT;
1339         int i, err;
1340         struct strvec args;
1341         struct string_list_item *cas_option;
1342         struct strbuf preamble = STRBUF_INIT;
1343         struct strbuf rpc_result = STRBUF_INIT;
1344
1345         strvec_init(&args);
1346         strvec_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
1347                      NULL);
1348
1349         if (options.thin)
1350                 strvec_push(&args, "--thin");
1351         if (options.dry_run)
1352                 strvec_push(&args, "--dry-run");
1353         if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
1354                 strvec_push(&args, "--signed=yes");
1355         else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
1356                 strvec_push(&args, "--signed=if-asked");
1357         if (options.atomic)
1358                 strvec_push(&args, "--atomic");
1359         if (options.verbosity == 0)
1360                 strvec_push(&args, "--quiet");
1361         else if (options.verbosity > 1)
1362                 strvec_push(&args, "--verbose");
1363         for (i = 0; i < options.push_options.nr; i++)
1364                 strvec_pushf(&args, "--push-option=%s",
1365                              options.push_options.items[i].string);
1366         strvec_push(&args, options.progress ? "--progress" : "--no-progress");
1367         for_each_string_list_item(cas_option, &cas_options)
1368                 strvec_push(&args, cas_option->string);
1369         strvec_push(&args, url.buf);
1370
1371         if (options.force_if_includes)
1372                 strvec_push(&args, "--force-if-includes");
1373
1374         strvec_push(&args, "--stdin");
1375         for (i = 0; i < nr_spec; i++)
1376                 packet_buf_write(&preamble, "%s\n", specs[i]);
1377         packet_buf_flush(&preamble);
1378
1379         memset(&rpc, 0, sizeof(rpc));
1380         rpc.service_name = "git-receive-pack",
1381
1382         err = rpc_service(&rpc, heads, args.v, &preamble, &rpc_result);
1383         if (rpc_result.len)
1384                 write_or_die(1, rpc_result.buf, rpc_result.len);
1385         strbuf_release(&rpc_result);
1386         strbuf_release(&preamble);
1387         strvec_clear(&args);
1388         return err;
1389 }
1390
1391 static int push(int nr_spec, const char **specs)
1392 {
1393         struct discovery *heads = discover_refs("git-receive-pack", 1);
1394         int ret;
1395
1396         if (heads->proto_git)
1397                 ret = push_git(heads, nr_spec, specs);
1398         else
1399                 ret = push_dav(nr_spec, specs);
1400         free_discovery(heads);
1401         return ret;
1402 }
1403
1404 static void parse_push(struct strbuf *buf)
1405 {
1406         struct strvec specs = STRVEC_INIT;
1407         int ret;
1408
1409         do {
1410                 const char *arg;
1411                 if (skip_prefix(buf->buf, "push ", &arg))
1412                         strvec_push(&specs, arg);
1413                 else
1414                         die(_("http transport does not support %s"), buf->buf);
1415
1416                 strbuf_reset(buf);
1417                 if (strbuf_getline_lf(buf, stdin) == EOF)
1418                         goto free_specs;
1419                 if (!*buf->buf)
1420                         break;
1421         } while (1);
1422
1423         ret = push(specs.nr, specs.v);
1424         printf("\n");
1425         fflush(stdout);
1426
1427         if (ret)
1428                 exit(128); /* error already reported */
1429
1430 free_specs:
1431         strvec_clear(&specs);
1432 }
1433
1434 static int stateless_connect(const char *service_name)
1435 {
1436         struct discovery *discover;
1437         struct rpc_state rpc = RPC_STATE_INIT;
1438         struct strbuf buf = STRBUF_INIT;
1439         const char *accept_language;
1440
1441         /*
1442          * Run the info/refs request and see if the server supports protocol
1443          * v2.  If and only if the server supports v2 can we successfully
1444          * establish a stateless connection, otherwise we need to tell the
1445          * client to fallback to using other transport helper functions to
1446          * complete their request.
1447          *
1448          * The "git-upload-archive" service is a read-only operation. Fallback
1449          * to use "git-upload-pack" service to discover protocol version.
1450          */
1451         if (!strcmp(service_name, "git-upload-archive"))
1452                 discover = discover_refs("git-upload-pack", 0);
1453         else
1454                 discover = discover_refs(service_name, 0);
1455         if (discover->version != protocol_v2) {
1456                 printf("fallback\n");
1457                 fflush(stdout);
1458                 return -1;
1459         } else {
1460                 /* Stateless Connection established */
1461                 printf("\n");
1462                 fflush(stdout);
1463         }
1464         accept_language = http_get_accept_language_header();
1465         if (accept_language)
1466                 rpc.hdr_accept_language = xstrfmt("%s", accept_language);
1467
1468         rpc.service_name = service_name;
1469         rpc.service_url = xstrfmt("%s%s", url.buf, rpc.service_name);
1470         rpc.hdr_content_type = xstrfmt("Content-Type: application/x-%s-request", rpc.service_name);
1471         rpc.hdr_accept = xstrfmt("Accept: application/x-%s-result", rpc.service_name);
1472         if (get_protocol_http_header(discover->version, &buf)) {
1473                 rpc.protocol_header = strbuf_detach(&buf, NULL);
1474         } else {
1475                 rpc.protocol_header = NULL;
1476                 strbuf_release(&buf);
1477         }
1478         rpc.buf = xmalloc(http_post_buffer);
1479         rpc.alloc = http_post_buffer;
1480         rpc.len = 0;
1481         rpc.pos = 0;
1482         rpc.in = 1;
1483         rpc.out = 0;
1484         rpc.any_written = 0;
1485         rpc.gzip_request = 1;
1486         rpc.initial_buffer = 0;
1487         rpc.write_line_lengths = 1;
1488         rpc.flush_read_but_not_sent = 0;
1489
1490         /*
1491          * Dump the capability listing that we got from the server earlier
1492          * during the info/refs request. This does not work with the
1493          * "git-upload-archive" service.
1494          */
1495         if (strcmp(service_name, "git-upload-archive"))
1496                 write_or_die(rpc.in, discover->buf, discover->len);
1497
1498         /* Until we see EOF keep sending POSTs */
1499         while (1) {
1500                 size_t avail;
1501                 enum packet_read_status status;
1502
1503                 if (!rpc_read_from_out(&rpc, PACKET_READ_GENTLE_ON_EOF, &avail,
1504                                        &status))
1505                         BUG("The entire rpc->buf should be larger than LARGE_PACKET_MAX");
1506                 if (status == PACKET_READ_EOF)
1507                         break;
1508                 if (post_rpc(&rpc, 1, status == PACKET_READ_FLUSH))
1509                         /* We would have an err here */
1510                         break;
1511                 /* Reset the buffer for next request */
1512                 rpc.len = 0;
1513         }
1514
1515         free(rpc.service_url);
1516         free(rpc.hdr_content_type);
1517         free(rpc.hdr_accept);
1518         free(rpc.hdr_accept_language);
1519         free(rpc.protocol_header);
1520         free(rpc.buf);
1521         strbuf_release(&buf);
1522
1523         return 0;
1524 }
1525
1526 int cmd_main(int argc, const char **argv)
1527 {
1528         struct strbuf buf = STRBUF_INIT;
1529         int nongit;
1530         int ret = 1;
1531
1532         setup_git_directory_gently(&nongit);
1533         if (argc < 2) {
1534                 error(_("remote-curl: usage: git remote-curl <remote> [<url>]"));
1535                 goto cleanup;
1536         }
1537
1538         options.verbosity = 1;
1539         options.progress = !!isatty(2);
1540         options.thin = 1;
1541         string_list_init_dup(&options.deepen_not);
1542         string_list_init_dup(&options.push_options);
1543
1544         /*
1545          * Just report "remote-curl" here (folding all the various aliases
1546          * ("git-remote-http", "git-remote-https", and etc.) here since they
1547          * are all just copies of the same actual executable.
1548          */
1549         trace2_cmd_name("remote-curl");
1550
1551         remote = remote_get(argv[1]);
1552
1553         if (argc > 2) {
1554                 end_url_with_slash(&url, argv[2]);
1555         } else {
1556                 end_url_with_slash(&url, remote->url[0]);
1557         }
1558
1559         http_init(remote, url.buf, 0);
1560
1561         do {
1562                 const char *arg;
1563
1564                 if (strbuf_getline_lf(&buf, stdin) == EOF) {
1565                         if (ferror(stdin))
1566                                 error(_("remote-curl: error reading command stream from git"));
1567                         goto cleanup;
1568                 }
1569                 if (buf.len == 0)
1570                         break;
1571                 if (starts_with(buf.buf, "fetch ")) {
1572                         if (nongit) {
1573                                 setup_git_directory_gently(&nongit);
1574                                 if (nongit)
1575                                         die(_("remote-curl: fetch attempted without a local repo"));
1576                         }
1577                         parse_fetch(&buf);
1578
1579                 } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1580                         int for_push = !!strstr(buf.buf + 4, "for-push");
1581                         output_refs(get_refs(for_push));
1582
1583                 } else if (starts_with(buf.buf, "push ")) {
1584                         parse_push(&buf);
1585
1586                 } else if (skip_prefix(buf.buf, "option ", &arg)) {
1587                         char *value = strchr(arg, ' ');
1588                         int result;
1589
1590                         if (value)
1591                                 *value++ = '\0';
1592                         else
1593                                 value = "true";
1594
1595                         result = set_option(arg, value);
1596                         if (!result)
1597                                 printf("ok\n");
1598                         else if (result < 0)
1599                                 printf("error invalid value\n");
1600                         else
1601                                 printf("unsupported\n");
1602                         fflush(stdout);
1603
1604                 } else if (skip_prefix(buf.buf, "get ", &arg)) {
1605                         parse_get(arg);
1606                         fflush(stdout);
1607
1608                 } else if (!strcmp(buf.buf, "capabilities")) {
1609                         printf("stateless-connect\n");
1610                         printf("fetch\n");
1611                         printf("get\n");
1612                         printf("option\n");
1613                         printf("push\n");
1614                         printf("check-connectivity\n");
1615                         printf("object-format\n");
1616                         printf("\n");
1617                         fflush(stdout);
1618                 } else if (skip_prefix(buf.buf, "stateless-connect ", &arg)) {
1619                         if (!stateless_connect(arg))
1620                                 break;
1621                 } else {
1622                         error(_("remote-curl: unknown command '%s' from git"), buf.buf);
1623                         goto cleanup;
1624                 }
1625                 strbuf_reset(&buf);
1626         } while (1);
1627
1628         http_cleanup();
1629         ret = 0;
1630 cleanup:
1631         strbuf_release(&buf);
1632
1633         return ret;
1634 }