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