git.oblomov.eu Git - git/blob - remote-curl.c

   1 #include "cache.h"
   2 #include "remote.h"
   3 #include "strbuf.h"
   4 #include "walker.h"
   5 #include "http.h"
   6 #include "exec_cmd.h"
   7 #include "run-command.h"
   8 #include "pkt-line.h"
   9 #include "string-list.h"
  10 #include "sideband.h"
  11 #include "argv-array.h"
  12 #include "credential.h"
  13 #include "sha1-array.h"
  14 #include "send-pack.h"
  15
  16 static struct remote *remote;
  17 /* always ends with a trailing slash */
  18 static struct strbuf url = STRBUF_INIT;
  19
  20 struct options {
  21         int verbosity;
  22         unsigned long depth;
  23         char *deepen_since;
  24         struct string_list deepen_not;
  25         unsigned progress : 1,
  26                 check_self_contained_and_connected : 1,
  27                 cloning : 1,
  28                 update_shallow : 1,
  29                 followtags : 1,
  30                 dry_run : 1,
  31                 thin : 1,
  32                 /* One of the SEND_PACK_PUSH_CERT_* constants. */
  33                 push_cert : 2,
  34                 deepen_relative : 1;
  35 };
  36 static struct options options;
  37 static struct string_list cas_options = STRING_LIST_INIT_DUP;
  38
  39 static int set_option(const char *name, const char *value)
  40 {
  41         if (!strcmp(name, "verbosity")) {
  42                 char *end;
  43                 int v = strtol(value, &end, 10);
  44                 if (value == end || *end)
  45                         return -1;
  46                 options.verbosity = v;
  47                 return 0;
  48         }
  49         else if (!strcmp(name, "progress")) {
  50                 if (!strcmp(value, "true"))
  51                         options.progress = 1;
  52                 else if (!strcmp(value, "false"))
  53                         options.progress = 0;
  54                 else
  55                         return -1;
  56                 return 0;
  57         }
  58         else if (!strcmp(name, "depth")) {
  59                 char *end;
  60                 unsigned long v = strtoul(value, &end, 10);
  61                 if (value == end || *end)
  62                         return -1;
  63                 options.depth = v;
  64                 return 0;
  65         }
  66         else if (!strcmp(name, "deepen-since")) {
  67                 options.deepen_since = xstrdup(value);
  68                 return 0;
  69         }
  70         else if (!strcmp(name, "deepen-not")) {
  71                 string_list_append(&options.deepen_not, value);
  72                 return 0;
  73         }
  74         else if (!strcmp(name, "deepen-relative")) {
  75                 if (!strcmp(value, "true"))
  76                         options.deepen_relative = 1;
  77                 else if (!strcmp(value, "false"))
  78                         options.deepen_relative = 0;
  79                 else
  80                         return -1;
  81                 return 0;
  82         }
  83         else if (!strcmp(name, "followtags")) {
  84                 if (!strcmp(value, "true"))
  85                         options.followtags = 1;
  86                 else if (!strcmp(value, "false"))
  87                         options.followtags = 0;
  88                 else
  89                         return -1;
  90                 return 0;
  91         }
  92         else if (!strcmp(name, "dry-run")) {
  93                 if (!strcmp(value, "true"))
  94                         options.dry_run = 1;
  95                 else if (!strcmp(value, "false"))
  96                         options.dry_run = 0;
  97                 else
  98                         return -1;
  99                 return 0;
 100         }
 101         else if (!strcmp(name, "check-connectivity")) {
 102                 if (!strcmp(value, "true"))
 103                         options.check_self_contained_and_connected = 1;
 104                 else if (!strcmp(value, "false"))
 105                         options.check_self_contained_and_connected = 0;
 106                 else
 107                         return -1;
 108                 return 0;
 109         }
 110         else if (!strcmp(name, "cas")) {
 111                 struct strbuf val = STRBUF_INIT;
 112                 strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
 113                 string_list_append(&cas_options, val.buf);
 114                 strbuf_release(&val);
 115                 return 0;
 116         } else if (!strcmp(name, "cloning")) {
 117                 if (!strcmp(value, "true"))
 118                         options.cloning = 1;
 119                 else if (!strcmp(value, "false"))
 120                         options.cloning = 0;
 121                 else
 122                         return -1;
 123                 return 0;
 124         } else if (!strcmp(name, "update-shallow")) {
 125                 if (!strcmp(value, "true"))
 126                         options.update_shallow = 1;
 127                 else if (!strcmp(value, "false"))
 128                         options.update_shallow = 0;
 129                 else
 130                         return -1;
 131                 return 0;
 132         } else if (!strcmp(name, "pushcert")) {
 133                 if (!strcmp(value, "true"))
 134                         options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 135                 else if (!strcmp(value, "false"))
 136                         options.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 137                 else if (!strcmp(value, "if-asked"))
 138                         options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 139                 else
 140                         return -1;
 141                 return 0;
 142         } else {
 143                 return 1 /* unsupported */;
 144         }
 145 }
 146
 147 struct discovery {
 148         const char *service;
 149         char *buf_alloc;
 150         char *buf;
 151         size_t len;
 152         struct ref *refs;
 153         struct sha1_array shallow;
 154         unsigned proto_git : 1;
 155 };
 156 static struct discovery *last_discovery;
 157
 158 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 159 {
 160         struct ref *list = NULL;
 161         get_remote_heads(-1, heads->buf, heads->len, &list,
 162                          for_push ? REF_NORMAL : 0, NULL, &heads->shallow);
 163         return list;
 164 }
 165
 166 static struct ref *parse_info_refs(struct discovery *heads)
 167 {
 168         char *data, *start, *mid;
 169         char *ref_name;
 170         int i = 0;
 171
 172         struct ref *refs = NULL;
 173         struct ref *ref = NULL;
 174         struct ref *last_ref = NULL;
 175
 176         data = heads->buf;
 177         start = NULL;
 178         mid = data;
 179         while (i < heads->len) {
 180                 if (!start) {
 181                         start = &data[i];
 182                 }
 183                 if (data[i] == '\t')
 184                         mid = &data[i];
 185                 if (data[i] == '\n') {
 186                         if (mid - start != 40)
 187                                 die("%sinfo/refs not valid: is this a git repository?",
 188                                     url.buf);
 189                         data[i] = 0;
 190                         ref_name = mid + 1;
 191                         ref = alloc_ref(ref_name);
 192                         get_oid_hex(start, &ref->old_oid);
 193                         if (!refs)
 194                                 refs = ref;
 195                         if (last_ref)
 196                                 last_ref->next = ref;
 197                         last_ref = ref;
 198                         start = NULL;
 199                 }
 200                 i++;
 201         }
 202
 203         ref = alloc_ref("HEAD");
 204         if (!http_fetch_ref(url.buf, ref) &&
 205             !resolve_remote_symref(ref, refs)) {
 206                 ref->next = refs;
 207                 refs = ref;
 208         } else {
 209                 free(ref);
 210         }
 211
 212         return refs;
 213 }
 214
 215 static void free_discovery(struct discovery *d)
 216 {
 217         if (d) {
 218                 if (d == last_discovery)
 219                         last_discovery = NULL;
 220                 free(d->shallow.sha1);
 221                 free(d->buf_alloc);
 222                 free_refs(d->refs);
 223                 free(d);
 224         }
 225 }
 226
 227 static int show_http_message(struct strbuf *type, struct strbuf *charset,
 228                              struct strbuf *msg)
 229 {
 230         const char *p, *eol;
 231
 232         /*
 233          * We only show text/plain parts, as other types are likely
 234          * to be ugly to look at on the user's terminal.
 235          */
 236         if (strcmp(type->buf, "text/plain"))
 237                 return -1;
 238         if (charset->len)
 239                 strbuf_reencode(msg, charset->buf, get_log_output_encoding());
 240
 241         strbuf_trim(msg);
 242         if (!msg->len)
 243                 return -1;
 244
 245         p = msg->buf;
 246         do {
 247                 eol = strchrnul(p, '\n');
 248                 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 249                 p = eol + 1;
 250         } while(*eol);
 251         return 0;
 252 }
 253
 254 static struct discovery *discover_refs(const char *service, int for_push)
 255 {
 256         struct strbuf exp = STRBUF_INIT;
 257         struct strbuf type = STRBUF_INIT;
 258         struct strbuf charset = STRBUF_INIT;
 259         struct strbuf buffer = STRBUF_INIT;
 260         struct strbuf refs_url = STRBUF_INIT;
 261         struct strbuf effective_url = STRBUF_INIT;
 262         struct discovery *last = last_discovery;
 263         int http_ret, maybe_smart = 0;
 264         struct http_get_options options;
 265
 266         if (last && !strcmp(service, last->service))
 267                 return last;
 268         free_discovery(last);
 269
 270         strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 271         if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 272              git_env_bool("GIT_SMART_HTTP", 1)) {
 273                 maybe_smart = 1;
 274                 if (!strchr(url.buf, '?'))
 275                         strbuf_addch(&refs_url, '?');
 276                 else
 277                         strbuf_addch(&refs_url, '&');
 278                 strbuf_addf(&refs_url, "service=%s", service);
 279         }
 280
 281         memset(&options, 0, sizeof(options));
 282         options.content_type = &type;
 283         options.charset = &charset;
 284         options.effective_url = &effective_url;
 285         options.base_url = &url;
 286         options.no_cache = 1;
 287         options.keep_error = 1;
 288
 289         http_ret = http_get_strbuf(refs_url.buf, &buffer, &options);
 290         switch (http_ret) {
 291         case HTTP_OK:
 292                 break;
 293         case HTTP_MISSING_TARGET:
 294                 show_http_message(&type, &charset, &buffer);
 295                 die("repository '%s' not found", url.buf);
 296         case HTTP_NOAUTH:
 297                 show_http_message(&type, &charset, &buffer);
 298                 die("Authentication failed for '%s'", url.buf);
 299         default:
 300                 show_http_message(&type, &charset, &buffer);
 301                 die("unable to access '%s': %s", url.buf, curl_errorstr);
 302         }
 303
 304         last= xcalloc(1, sizeof(*last_discovery));
 305         last->service = service;
 306         last->buf_alloc = strbuf_detach(&buffer, &last->len);
 307         last->buf = last->buf_alloc;
 308
 309         strbuf_addf(&exp, "application/x-%s-advertisement", service);
 310         if (maybe_smart &&
 311             (5 <= last->len && last->buf[4] == '#') &&
 312             !strbuf_cmp(&exp, &type)) {
 313                 char *line;
 314
 315                 /*
 316                  * smart HTTP response; validate that the service
 317                  * pkt-line matches our request.
 318                  */
 319                 line = packet_read_line_buf(&last->buf, &last->len, NULL);
 320
 321                 strbuf_reset(&exp);
 322                 strbuf_addf(&exp, "# service=%s", service);
 323                 if (strcmp(line, exp.buf))
 324                         die("invalid server response; got '%s'", line);
 325                 strbuf_release(&exp);
 326
 327                 /* The header can include additional metadata lines, up
 328                  * until a packet flush marker.  Ignore these now, but
 329                  * in the future we might start to scan them.
 330                  */
 331                 while (packet_read_line_buf(&last->buf, &last->len, NULL))
 332                         ;
 333
 334                 last->proto_git = 1;
 335         }
 336
 337         if (last->proto_git)
 338                 last->refs = parse_git_refs(last, for_push);
 339         else
 340                 last->refs = parse_info_refs(last);
 341
 342         strbuf_release(&refs_url);
 343         strbuf_release(&exp);
 344         strbuf_release(&type);
 345         strbuf_release(&charset);
 346         strbuf_release(&effective_url);
 347         strbuf_release(&buffer);
 348         last_discovery = last;
 349         return last;
 350 }
 351
 352 static struct ref *get_refs(int for_push)
 353 {
 354         struct discovery *heads;
 355
 356         if (for_push)
 357                 heads = discover_refs("git-receive-pack", for_push);
 358         else
 359                 heads = discover_refs("git-upload-pack", for_push);
 360
 361         return heads->refs;
 362 }
 363
 364 static void output_refs(struct ref *refs)
 365 {
 366         struct ref *posn;
 367         for (posn = refs; posn; posn = posn->next) {
 368                 if (posn->symref)
 369                         printf("@%s %s\n", posn->symref, posn->name);
 370                 else
 371                         printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name);
 372         }
 373         printf("\n");
 374         fflush(stdout);
 375 }
 376
 377 struct rpc_state {
 378         const char *service_name;
 379         const char **argv;
 380         struct strbuf *stdin_preamble;
 381         char *service_url;
 382         char *hdr_content_type;
 383         char *hdr_accept;
 384         char *buf;
 385         size_t alloc;
 386         size_t len;
 387         size_t pos;
 388         int in;
 389         int out;
 390         struct strbuf result;
 391         unsigned gzip_request : 1;
 392         unsigned initial_buffer : 1;
 393 };
 394
 395 static size_t rpc_out(void *ptr, size_t eltsize,
 396                 size_t nmemb, void *buffer_)
 397 {
 398         size_t max = eltsize * nmemb;
 399         struct rpc_state *rpc = buffer_;
 400         size_t avail = rpc->len - rpc->pos;
 401
 402         if (!avail) {
 403                 rpc->initial_buffer = 0;
 404                 avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 405                 if (!avail)
 406                         return 0;
 407                 rpc->pos = 0;
 408                 rpc->len = avail;
 409         }
 410
 411         if (max < avail)
 412                 avail = max;
 413         memcpy(ptr, rpc->buf + rpc->pos, avail);
 414         rpc->pos += avail;
 415         return avail;
 416 }
 417
 418 #ifndef NO_CURL_IOCTL
 419 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 420 {
 421         struct rpc_state *rpc = clientp;
 422
 423         switch (cmd) {
 424         case CURLIOCMD_NOP:
 425                 return CURLIOE_OK;
 426
 427         case CURLIOCMD_RESTARTREAD:
 428                 if (rpc->initial_buffer) {
 429                         rpc->pos = 0;
 430                         return CURLIOE_OK;
 431                 }
 432                 error("unable to rewind rpc post data - try increasing http.postBuffer");
 433                 return CURLIOE_FAILRESTART;
 434
 435         default:
 436                 return CURLIOE_UNKNOWNCMD;
 437         }
 438 }
 439 #endif
 440
 441 static size_t rpc_in(char *ptr, size_t eltsize,
 442                 size_t nmemb, void *buffer_)
 443 {
 444         size_t size = eltsize * nmemb;
 445         struct rpc_state *rpc = buffer_;
 446         write_or_die(rpc->in, ptr, size);
 447         return size;
 448 }
 449
 450 static int run_slot(struct active_request_slot *slot,
 451                     struct slot_results *results)
 452 {
 453         int err;
 454         struct slot_results results_buf;
 455
 456         if (!results)
 457                 results = &results_buf;
 458
 459         err = run_one_slot(slot, results);
 460
 461         if (err != HTTP_OK && err != HTTP_REAUTH) {
 462                 error("RPC failed; result=%d, HTTP code = %ld",
 463                       results->curl_result, results->http_code);
 464         }
 465
 466         return err;
 467 }
 468
 469 static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 470 {
 471         struct active_request_slot *slot;
 472         struct curl_slist *headers = NULL;
 473         struct strbuf buf = STRBUF_INIT;
 474         int err;
 475
 476         slot = get_active_slot();
 477
 478         headers = curl_slist_append(headers, rpc->hdr_content_type);
 479         headers = curl_slist_append(headers, rpc->hdr_accept);
 480
 481         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 482         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 483         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 484         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 485         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 486         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 487         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 488         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 489         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 490
 491         err = run_slot(slot, results);
 492
 493         curl_slist_free_all(headers);
 494         strbuf_release(&buf);
 495         return err;
 496 }
 497
 498 static int post_rpc(struct rpc_state *rpc)
 499 {
 500         struct active_request_slot *slot;
 501         struct curl_slist *headers = NULL;
 502         int use_gzip = rpc->gzip_request;
 503         char *gzip_body = NULL;
 504         size_t gzip_size = 0;
 505         int err, large_request = 0;
 506         int needs_100_continue = 0;
 507
 508         /* Try to load the entire request, if we can fit it into the
 509          * allocated buffer space we can use HTTP/1.0 and avoid the
 510          * chunked encoding mess.
 511          */
 512         while (1) {
 513                 size_t left = rpc->alloc - rpc->len;
 514                 char *buf = rpc->buf + rpc->len;
 515                 int n;
 516
 517                 if (left < LARGE_PACKET_MAX) {
 518                         large_request = 1;
 519                         use_gzip = 0;
 520                         break;
 521                 }
 522
 523                 n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 524                 if (!n)
 525                         break;
 526                 rpc->len += n;
 527         }
 528
 529         if (large_request) {
 530                 struct slot_results results;
 531
 532                 do {
 533                         err = probe_rpc(rpc, &results);
 534                         if (err == HTTP_REAUTH)
 535                                 credential_fill(&http_auth);
 536                 } while (err == HTTP_REAUTH);
 537                 if (err != HTTP_OK)
 538                         return -1;
 539
 540                 if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 541                         needs_100_continue = 1;
 542         }
 543
 544         headers = curl_slist_append(headers, rpc->hdr_content_type);
 545         headers = curl_slist_append(headers, rpc->hdr_accept);
 546         headers = curl_slist_append(headers, needs_100_continue ?
 547                 "Expect: 100-continue" : "Expect:");
 548
 549 retry:
 550         slot = get_active_slot();
 551
 552         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 553         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 554         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 555         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 556
 557         if (large_request) {
 558                 /* The request body is large and the size cannot be predicted.
 559                  * We must use chunked encoding to send it.
 560                  */
 561                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 562                 rpc->initial_buffer = 1;
 563                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 564                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 565 #ifndef NO_CURL_IOCTL
 566                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 567                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 568 #endif
 569                 if (options.verbosity > 1) {
 570                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 571                         fflush(stderr);
 572                 }
 573
 574         } else if (gzip_body) {
 575                 /*
 576                  * If we are looping to retry authentication, then the previous
 577                  * run will have set up the headers and gzip buffer already,
 578                  * and we just need to send it.
 579                  */
 580                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 581                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 582
 583         } else if (use_gzip && 1024 < rpc->len) {
 584                 /* The client backend isn't giving us compressed data so
 585                  * we can try to deflate it ourselves, this may save on.
 586                  * the transfer time.
 587                  */
 588                 git_zstream stream;
 589                 int ret;
 590
 591                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 592                 gzip_size = git_deflate_bound(&stream, rpc->len);
 593                 gzip_body = xmalloc(gzip_size);
 594
 595                 stream.next_in = (unsigned char *)rpc->buf;
 596                 stream.avail_in = rpc->len;
 597                 stream.next_out = (unsigned char *)gzip_body;
 598                 stream.avail_out = gzip_size;
 599
 600                 ret = git_deflate(&stream, Z_FINISH);
 601                 if (ret != Z_STREAM_END)
 602                         die("cannot deflate request; zlib deflate error %d", ret);
 603
 604                 ret = git_deflate_end_gently(&stream);
 605                 if (ret != Z_OK)
 606                         die("cannot deflate request; zlib end error %d", ret);
 607
 608                 gzip_size = stream.total_out;
 609
 610                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 611                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 612                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 613
 614                 if (options.verbosity > 1) {
 615                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 616                                 rpc->service_name,
 617                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
 618                         fflush(stderr);
 619                 }
 620         } else {
 621                 /* We know the complete request size in advance, use the
 622                  * more normal Content-Length approach.
 623                  */
 624                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 625                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 626                 if (options.verbosity > 1) {
 627                         fprintf(stderr, "POST %s (%lu bytes)\n",
 628                                 rpc->service_name, (unsigned long)rpc->len);
 629                         fflush(stderr);
 630                 }
 631         }
 632
 633         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 634         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 635         curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 636
 637         err = run_slot(slot, NULL);
 638         if (err == HTTP_REAUTH && !large_request) {
 639                 credential_fill(&http_auth);
 640                 goto retry;
 641         }
 642         if (err != HTTP_OK)
 643                 err = -1;
 644
 645         curl_slist_free_all(headers);
 646         free(gzip_body);
 647         return err;
 648 }
 649
 650 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 651 {
 652         const char *svc = rpc->service_name;
 653         struct strbuf buf = STRBUF_INIT;
 654         struct strbuf *preamble = rpc->stdin_preamble;
 655         struct child_process client = CHILD_PROCESS_INIT;
 656         int err = 0;
 657
 658         client.in = -1;
 659         client.out = -1;
 660         client.git_cmd = 1;
 661         client.argv = rpc->argv;
 662         if (start_command(&client))
 663                 exit(1);
 664         if (preamble)
 665                 write_or_die(client.in, preamble->buf, preamble->len);
 666         if (heads)
 667                 write_or_die(client.in, heads->buf, heads->len);
 668
 669         rpc->alloc = http_post_buffer;
 670         rpc->buf = xmalloc(rpc->alloc);
 671         rpc->in = client.in;
 672         rpc->out = client.out;
 673         strbuf_init(&rpc->result, 0);
 674
 675         strbuf_addf(&buf, "%s%s", url.buf, svc);
 676         rpc->service_url = strbuf_detach(&buf, NULL);
 677
 678         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 679         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 680
 681         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 682         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 683
 684         while (!err) {
 685                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 686                 if (!n)
 687                         break;
 688                 rpc->pos = 0;
 689                 rpc->len = n;
 690                 err |= post_rpc(rpc);
 691         }
 692
 693         close(client.in);
 694         client.in = -1;
 695         if (!err) {
 696                 strbuf_read(&rpc->result, client.out, 0);
 697         } else {
 698                 char buf[4096];
 699                 for (;;)
 700                         if (xread(client.out, buf, sizeof(buf)) <= 0)
 701                                 break;
 702         }
 703
 704         close(client.out);
 705         client.out = -1;
 706
 707         err |= finish_command(&client);
 708         free(rpc->service_url);
 709         free(rpc->hdr_content_type);
 710         free(rpc->hdr_accept);
 711         free(rpc->buf);
 712         strbuf_release(&buf);
 713         return err;
 714 }
 715
 716 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 717 {
 718         struct walker *walker;
 719         char **targets = xmalloc(nr_heads * sizeof(char*));
 720         int ret, i;
 721
 722         if (options.depth || options.deepen_since)
 723                 die("dumb http transport does not support shallow capabilities");
 724         for (i = 0; i < nr_heads; i++)
 725                 targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
 726
 727         walker = get_http_walker(url.buf);
 728         walker->get_all = 1;
 729         walker->get_tree = 1;
 730         walker->get_history = 1;
 731         walker->get_verbosely = options.verbosity >= 3;
 732         walker->get_recover = 0;
 733         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 734         walker_free(walker);
 735
 736         for (i = 0; i < nr_heads; i++)
 737                 free(targets[i]);
 738         free(targets);
 739
 740         return ret ? error("fetch failed.") : 0;
 741 }
 742
 743 static int fetch_git(struct discovery *heads,
 744         int nr_heads, struct ref **to_fetch)
 745 {
 746         struct rpc_state rpc;
 747         struct strbuf preamble = STRBUF_INIT;
 748         int i, err;
 749         struct argv_array args = ARGV_ARRAY_INIT;
 750
 751         argv_array_pushl(&args, "fetch-pack", "--stateless-rpc",
 752                          "--stdin", "--lock-pack", NULL);
 753         if (options.followtags)
 754                 argv_array_push(&args, "--include-tag");
 755         if (options.thin)
 756                 argv_array_push(&args, "--thin");
 757         if (options.verbosity >= 3)
 758                 argv_array_pushl(&args, "-v", "-v", NULL);
 759         if (options.check_self_contained_and_connected)
 760                 argv_array_push(&args, "--check-self-contained-and-connected");
 761         if (options.cloning)
 762                 argv_array_push(&args, "--cloning");
 763         if (options.update_shallow)
 764                 argv_array_push(&args, "--update-shallow");
 765         if (!options.progress)
 766                 argv_array_push(&args, "--no-progress");
 767         if (options.depth)
 768                 argv_array_pushf(&args, "--depth=%lu", options.depth);
 769         if (options.deepen_since)
 770                 argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since);
 771         for (i = 0; i < options.deepen_not.nr; i++)
 772                 argv_array_pushf(&args, "--shallow-exclude=%s",
 773                                  options.deepen_not.items[i].string);
 774         if (options.deepen_relative && options.depth)
 775                 argv_array_push(&args, "--deepen-relative");
 776         argv_array_push(&args, url.buf);
 777
 778         for (i = 0; i < nr_heads; i++) {
 779                 struct ref *ref = to_fetch[i];
 780                 if (!*ref->name)
 781                         die("cannot fetch by sha1 over smart http");
 782                 packet_buf_write(&preamble, "%s %s\n",
 783                                  oid_to_hex(&ref->old_oid), ref->name);
 784         }
 785         packet_buf_flush(&preamble);
 786
 787         memset(&rpc, 0, sizeof(rpc));
 788         rpc.service_name = "git-upload-pack",
 789         rpc.argv = args.argv;
 790         rpc.stdin_preamble = &preamble;
 791         rpc.gzip_request = 1;
 792
 793         err = rpc_service(&rpc, heads);
 794         if (rpc.result.len)
 795                 write_or_die(1, rpc.result.buf, rpc.result.len);
 796         strbuf_release(&rpc.result);
 797         strbuf_release(&preamble);
 798         argv_array_clear(&args);
 799         return err;
 800 }
 801
 802 static int fetch(int nr_heads, struct ref **to_fetch)
 803 {
 804         struct discovery *d = discover_refs("git-upload-pack", 0);
 805         if (d->proto_git)
 806                 return fetch_git(d, nr_heads, to_fetch);
 807         else
 808                 return fetch_dumb(nr_heads, to_fetch);
 809 }
 810
 811 static void parse_fetch(struct strbuf *buf)
 812 {
 813         struct ref **to_fetch = NULL;
 814         struct ref *list_head = NULL;
 815         struct ref **list = &list_head;
 816         int alloc_heads = 0, nr_heads = 0;
 817
 818         do {
 819                 const char *p;
 820                 if (skip_prefix(buf->buf, "fetch ", &p)) {
 821                         const char *name;
 822                         struct ref *ref;
 823                         struct object_id old_oid;
 824
 825                         if (get_oid_hex(p, &old_oid))
 826                                 die("protocol error: expected sha/ref, got %s'", p);
 827                         if (p[GIT_SHA1_HEXSZ] == ' ')
 828                                 name = p + GIT_SHA1_HEXSZ + 1;
 829                         else if (!p[GIT_SHA1_HEXSZ])
 830                                 name = "";
 831                         else
 832                                 die("protocol error: expected sha/ref, got %s'", p);
 833
 834                         ref = alloc_ref(name);
 835                         oidcpy(&ref->old_oid, &old_oid);
 836
 837                         *list = ref;
 838                         list = &ref->next;
 839
 840                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 841                         to_fetch[nr_heads++] = ref;
 842                 }
 843                 else
 844                         die("http transport does not support %s", buf->buf);
 845
 846                 strbuf_reset(buf);
 847                 if (strbuf_getline_lf(buf, stdin) == EOF)
 848                         return;
 849                 if (!*buf->buf)
 850                         break;
 851         } while (1);
 852
 853         if (fetch(nr_heads, to_fetch))
 854                 exit(128); /* error already reported */
 855         free_refs(list_head);
 856         free(to_fetch);
 857
 858         printf("\n");
 859         fflush(stdout);
 860         strbuf_reset(buf);
 861 }
 862
 863 static int push_dav(int nr_spec, char **specs)
 864 {
 865         const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 866         int argc = 0, i;
 867
 868         argv[argc++] = "http-push";
 869         argv[argc++] = "--helper-status";
 870         if (options.dry_run)
 871                 argv[argc++] = "--dry-run";
 872         if (options.verbosity > 1)
 873                 argv[argc++] = "--verbose";
 874         argv[argc++] = url.buf;
 875         for (i = 0; i < nr_spec; i++)
 876                 argv[argc++] = specs[i];
 877         argv[argc++] = NULL;
 878
 879         if (run_command_v_opt(argv, RUN_GIT_CMD))
 880                 die("git-%s failed", argv[0]);
 881         free(argv);
 882         return 0;
 883 }
 884
 885 static int push_git(struct discovery *heads, int nr_spec, char **specs)
 886 {
 887         struct rpc_state rpc;
 888         int i, err;
 889         struct argv_array args;
 890         struct string_list_item *cas_option;
 891         struct strbuf preamble = STRBUF_INIT;
 892
 893         argv_array_init(&args);
 894         argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 895                          NULL);
 896
 897         if (options.thin)
 898                 argv_array_push(&args, "--thin");
 899         if (options.dry_run)
 900                 argv_array_push(&args, "--dry-run");
 901         if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
 902                 argv_array_push(&args, "--signed=yes");
 903         else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
 904                 argv_array_push(&args, "--signed=if-asked");
 905         if (options.verbosity == 0)
 906                 argv_array_push(&args, "--quiet");
 907         else if (options.verbosity > 1)
 908                 argv_array_push(&args, "--verbose");
 909         argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 910         for_each_string_list_item(cas_option, &cas_options)
 911                 argv_array_push(&args, cas_option->string);
 912         argv_array_push(&args, url.buf);
 913
 914         argv_array_push(&args, "--stdin");
 915         for (i = 0; i < nr_spec; i++)
 916                 packet_buf_write(&preamble, "%s\n", specs[i]);
 917         packet_buf_flush(&preamble);
 918
 919         memset(&rpc, 0, sizeof(rpc));
 920         rpc.service_name = "git-receive-pack",
 921         rpc.argv = args.argv;
 922         rpc.stdin_preamble = &preamble;
 923
 924         err = rpc_service(&rpc, heads);
 925         if (rpc.result.len)
 926                 write_or_die(1, rpc.result.buf, rpc.result.len);
 927         strbuf_release(&rpc.result);
 928         strbuf_release(&preamble);
 929         argv_array_clear(&args);
 930         return err;
 931 }
 932
 933 static int push(int nr_spec, char **specs)
 934 {
 935         struct discovery *heads = discover_refs("git-receive-pack", 1);
 936         int ret;
 937
 938         if (heads->proto_git)
 939                 ret = push_git(heads, nr_spec, specs);
 940         else
 941                 ret = push_dav(nr_spec, specs);
 942         free_discovery(heads);
 943         return ret;
 944 }
 945
 946 static void parse_push(struct strbuf *buf)
 947 {
 948         char **specs = NULL;
 949         int alloc_spec = 0, nr_spec = 0, i, ret;
 950
 951         do {
 952                 if (starts_with(buf->buf, "push ")) {
 953                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 954                         specs[nr_spec++] = xstrdup(buf->buf + 5);
 955                 }
 956                 else
 957                         die("http transport does not support %s", buf->buf);
 958
 959                 strbuf_reset(buf);
 960                 if (strbuf_getline_lf(buf, stdin) == EOF)
 961                         goto free_specs;
 962                 if (!*buf->buf)
 963                         break;
 964         } while (1);
 965
 966         ret = push(nr_spec, specs);
 967         printf("\n");
 968         fflush(stdout);
 969
 970         if (ret)
 971                 exit(128); /* error already reported */
 972
 973  free_specs:
 974         for (i = 0; i < nr_spec; i++)
 975                 free(specs[i]);
 976         free(specs);
 977 }
 978
 979 int main(int argc, const char **argv)
 980 {
 981         struct strbuf buf = STRBUF_INIT;
 982         int nongit;
 983
 984         git_setup_gettext();
 985
 986         git_extract_argv0_path(argv[0]);
 987         setup_git_directory_gently(&nongit);
 988         if (argc < 2) {
 989                 error("remote-curl: usage: git remote-curl <remote> [<url>]");
 990                 return 1;
 991         }
 992
 993         options.verbosity = 1;
 994         options.progress = !!isatty(2);
 995         options.thin = 1;
 996         string_list_init(&options.deepen_not, 1);
 997
 998         remote = remote_get(argv[1]);
 999
1000         if (argc > 2) {
1001                 end_url_with_slash(&url, argv[2]);
1002         } else {
1003                 end_url_with_slash(&url, remote->url[0]);
1004         }
1005
1006         http_init(remote, url.buf, 0);
1007
1008         do {
1009                 const char *arg;
1010
1011                 if (strbuf_getline_lf(&buf, stdin) == EOF) {
1012                         if (ferror(stdin))
1013                                 error("remote-curl: error reading command stream from git");
1014                         return 1;
1015                 }
1016                 if (buf.len == 0)
1017                         break;
1018                 if (starts_with(buf.buf, "fetch ")) {
1019                         if (nongit)
1020                                 die("remote-curl: fetch attempted without a local repo");
1021                         parse_fetch(&buf);
1022
1023                 } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1024                         int for_push = !!strstr(buf.buf + 4, "for-push");
1025                         output_refs(get_refs(for_push));
1026
1027                 } else if (starts_with(buf.buf, "push ")) {
1028                         parse_push(&buf);
1029
1030                 } else if (skip_prefix(buf.buf, "option ", &arg)) {
1031                         char *value = strchr(arg, ' ');
1032                         int result;
1033
1034                         if (value)
1035                                 *value++ = '\0';
1036                         else
1037                                 value = "true";
1038
1039                         result = set_option(arg, value);
1040                         if (!result)
1041                                 printf("ok\n");
1042                         else if (result < 0)
1043                                 printf("error invalid value\n");
1044                         else
1045                                 printf("unsupported\n");
1046                         fflush(stdout);
1047
1048                 } else if (!strcmp(buf.buf, "capabilities")) {
1049                         printf("fetch\n");
1050                         printf("option\n");
1051                         printf("push\n");
1052                         printf("check-connectivity\n");
1053                         printf("\n");
1054                         fflush(stdout);
1055                 } else {
1056                         error("remote-curl: unknown command '%s' from git", buf.buf);
1057                         return 1;
1058                 }
1059                 strbuf_reset(&buf);
1060         } while (1);
1061
1062         http_cleanup();
1063
1064         return 0;
1065 }