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
  15 static struct remote *remote;
  16 /* always ends with a trailing slash */
  17 static struct strbuf url = STRBUF_INIT;
  18
  19 struct options {
  20         int verbosity;
  21         unsigned long depth;
  22         unsigned progress : 1,
  23                 check_self_contained_and_connected : 1,
  24                 cloning : 1,
  25                 update_shallow : 1,
  26                 followtags : 1,
  27                 dry_run : 1,
  28                 thin : 1,
  29                 push_cert : 1;
  30 };
  31 static struct options options;
  32 static struct string_list cas_options = STRING_LIST_INIT_DUP;
  33
  34 static int set_option(const char *name, const char *value)
  35 {
  36         if (!strcmp(name, "verbosity")) {
  37                 char *end;
  38                 int v = strtol(value, &end, 10);
  39                 if (value == end || *end)
  40                         return -1;
  41                 options.verbosity = v;
  42                 return 0;
  43         }
  44         else if (!strcmp(name, "progress")) {
  45                 if (!strcmp(value, "true"))
  46                         options.progress = 1;
  47                 else if (!strcmp(value, "false"))
  48                         options.progress = 0;
  49                 else
  50                         return -1;
  51                 return 0;
  52         }
  53         else if (!strcmp(name, "depth")) {
  54                 char *end;
  55                 unsigned long v = strtoul(value, &end, 10);
  56                 if (value == end || *end)
  57                         return -1;
  58                 options.depth = v;
  59                 return 0;
  60         }
  61         else if (!strcmp(name, "followtags")) {
  62                 if (!strcmp(value, "true"))
  63                         options.followtags = 1;
  64                 else if (!strcmp(value, "false"))
  65                         options.followtags = 0;
  66                 else
  67                         return -1;
  68                 return 0;
  69         }
  70         else if (!strcmp(name, "dry-run")) {
  71                 if (!strcmp(value, "true"))
  72                         options.dry_run = 1;
  73                 else if (!strcmp(value, "false"))
  74                         options.dry_run = 0;
  75                 else
  76                         return -1;
  77                 return 0;
  78         }
  79         else if (!strcmp(name, "check-connectivity")) {
  80                 if (!strcmp(value, "true"))
  81                         options.check_self_contained_and_connected = 1;
  82                 else if (!strcmp(value, "false"))
  83                         options.check_self_contained_and_connected = 0;
  84                 else
  85                         return -1;
  86                 return 0;
  87         }
  88         else if (!strcmp(name, "cas")) {
  89                 struct strbuf val = STRBUF_INIT;
  90                 strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
  91                 string_list_append(&cas_options, val.buf);
  92                 strbuf_release(&val);
  93                 return 0;
  94         } else if (!strcmp(name, "cloning")) {
  95                 if (!strcmp(value, "true"))
  96                         options.cloning = 1;
  97                 else if (!strcmp(value, "false"))
  98                         options.cloning = 0;
  99                 else
 100                         return -1;
 101                 return 0;
 102         } else if (!strcmp(name, "update-shallow")) {
 103                 if (!strcmp(value, "true"))
 104                         options.update_shallow = 1;
 105                 else if (!strcmp(value, "false"))
 106                         options.update_shallow = 0;
 107                 else
 108                         return -1;
 109                 return 0;
 110         } else if (!strcmp(name, "pushcert")) {
 111                 if (!strcmp(value, "true"))
 112                         options.push_cert = 1;
 113                 else if (!strcmp(value, "false"))
 114                         options.push_cert = 0;
 115                 else
 116                         return -1;
 117                 return 0;
 118         } else {
 119                 return 1 /* unsupported */;
 120         }
 121 }
 122
 123 struct discovery {
 124         const char *service;
 125         char *buf_alloc;
 126         char *buf;
 127         size_t len;
 128         struct ref *refs;
 129         struct sha1_array shallow;
 130         unsigned proto_git : 1;
 131 };
 132 static struct discovery *last_discovery;
 133
 134 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 135 {
 136         struct ref *list = NULL;
 137         get_remote_heads(-1, heads->buf, heads->len, &list,
 138                          for_push ? REF_NORMAL : 0, NULL, &heads->shallow);
 139         return list;
 140 }
 141
 142 static struct ref *parse_info_refs(struct discovery *heads)
 143 {
 144         char *data, *start, *mid;
 145         char *ref_name;
 146         int i = 0;
 147
 148         struct ref *refs = NULL;
 149         struct ref *ref = NULL;
 150         struct ref *last_ref = NULL;
 151
 152         data = heads->buf;
 153         start = NULL;
 154         mid = data;
 155         while (i < heads->len) {
 156                 if (!start) {
 157                         start = &data[i];
 158                 }
 159                 if (data[i] == '\t')
 160                         mid = &data[i];
 161                 if (data[i] == '\n') {
 162                         if (mid - start != 40)
 163                                 die("%sinfo/refs not valid: is this a git repository?",
 164                                     url.buf);
 165                         data[i] = 0;
 166                         ref_name = mid + 1;
 167                         ref = xmalloc(sizeof(struct ref) +
 168                                       strlen(ref_name) + 1);
 169                         memset(ref, 0, sizeof(struct ref));
 170                         strcpy(ref->name, ref_name);
 171                         get_sha1_hex(start, ref->old_sha1);
 172                         if (!refs)
 173                                 refs = ref;
 174                         if (last_ref)
 175                                 last_ref->next = ref;
 176                         last_ref = ref;
 177                         start = NULL;
 178                 }
 179                 i++;
 180         }
 181
 182         ref = alloc_ref("HEAD");
 183         if (!http_fetch_ref(url.buf, ref) &&
 184             !resolve_remote_symref(ref, refs)) {
 185                 ref->next = refs;
 186                 refs = ref;
 187         } else {
 188                 free(ref);
 189         }
 190
 191         return refs;
 192 }
 193
 194 static void free_discovery(struct discovery *d)
 195 {
 196         if (d) {
 197                 if (d == last_discovery)
 198                         last_discovery = NULL;
 199                 free(d->shallow.sha1);
 200                 free(d->buf_alloc);
 201                 free_refs(d->refs);
 202                 free(d);
 203         }
 204 }
 205
 206 static int show_http_message(struct strbuf *type, struct strbuf *charset,
 207                              struct strbuf *msg)
 208 {
 209         const char *p, *eol;
 210
 211         /*
 212          * We only show text/plain parts, as other types are likely
 213          * to be ugly to look at on the user's terminal.
 214          */
 215         if (strcmp(type->buf, "text/plain"))
 216                 return -1;
 217         if (charset->len)
 218                 strbuf_reencode(msg, charset->buf, get_log_output_encoding());
 219
 220         strbuf_trim(msg);
 221         if (!msg->len)
 222                 return -1;
 223
 224         p = msg->buf;
 225         do {
 226                 eol = strchrnul(p, '\n');
 227                 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 228                 p = eol + 1;
 229         } while(*eol);
 230         return 0;
 231 }
 232
 233 static struct discovery *discover_refs(const char *service, int for_push)
 234 {
 235         struct strbuf exp = STRBUF_INIT;
 236         struct strbuf type = STRBUF_INIT;
 237         struct strbuf charset = STRBUF_INIT;
 238         struct strbuf buffer = STRBUF_INIT;
 239         struct strbuf refs_url = STRBUF_INIT;
 240         struct strbuf effective_url = STRBUF_INIT;
 241         struct discovery *last = last_discovery;
 242         int http_ret, maybe_smart = 0;
 243         struct http_get_options options;
 244
 245         if (last && !strcmp(service, last->service))
 246                 return last;
 247         free_discovery(last);
 248
 249         strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 250         if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 251              git_env_bool("GIT_SMART_HTTP", 1)) {
 252                 maybe_smart = 1;
 253                 if (!strchr(url.buf, '?'))
 254                         strbuf_addch(&refs_url, '?');
 255                 else
 256                         strbuf_addch(&refs_url, '&');
 257                 strbuf_addf(&refs_url, "service=%s", service);
 258         }
 259
 260         memset(&options, 0, sizeof(options));
 261         options.content_type = &type;
 262         options.charset = &charset;
 263         options.effective_url = &effective_url;
 264         options.base_url = &url;
 265         options.no_cache = 1;
 266         options.keep_error = 1;
 267
 268         http_ret = http_get_strbuf(refs_url.buf, &buffer, &options);
 269         switch (http_ret) {
 270         case HTTP_OK:
 271                 break;
 272         case HTTP_MISSING_TARGET:
 273                 show_http_message(&type, &charset, &buffer);
 274                 die("repository '%s' not found", url.buf);
 275         case HTTP_NOAUTH:
 276                 show_http_message(&type, &charset, &buffer);
 277                 die("Authentication failed for '%s'", url.buf);
 278         default:
 279                 show_http_message(&type, &charset, &buffer);
 280                 die("unable to access '%s': %s", url.buf, curl_errorstr);
 281         }
 282
 283         last= xcalloc(1, sizeof(*last_discovery));
 284         last->service = service;
 285         last->buf_alloc = strbuf_detach(&buffer, &last->len);
 286         last->buf = last->buf_alloc;
 287
 288         strbuf_addf(&exp, "application/x-%s-advertisement", service);
 289         if (maybe_smart &&
 290             (5 <= last->len && last->buf[4] == '#') &&
 291             !strbuf_cmp(&exp, &type)) {
 292                 char *line;
 293
 294                 /*
 295                  * smart HTTP response; validate that the service
 296                  * pkt-line matches our request.
 297                  */
 298                 line = packet_read_line_buf(&last->buf, &last->len, NULL);
 299
 300                 strbuf_reset(&exp);
 301                 strbuf_addf(&exp, "# service=%s", service);
 302                 if (strcmp(line, exp.buf))
 303                         die("invalid server response; got '%s'", line);
 304                 strbuf_release(&exp);
 305
 306                 /* The header can include additional metadata lines, up
 307                  * until a packet flush marker.  Ignore these now, but
 308                  * in the future we might start to scan them.
 309                  */
 310                 while (packet_read_line_buf(&last->buf, &last->len, NULL))
 311                         ;
 312
 313                 last->proto_git = 1;
 314         }
 315
 316         if (last->proto_git)
 317                 last->refs = parse_git_refs(last, for_push);
 318         else
 319                 last->refs = parse_info_refs(last);
 320
 321         strbuf_release(&refs_url);
 322         strbuf_release(&exp);
 323         strbuf_release(&type);
 324         strbuf_release(&charset);
 325         strbuf_release(&effective_url);
 326         strbuf_release(&buffer);
 327         last_discovery = last;
 328         return last;
 329 }
 330
 331 static struct ref *get_refs(int for_push)
 332 {
 333         struct discovery *heads;
 334
 335         if (for_push)
 336                 heads = discover_refs("git-receive-pack", for_push);
 337         else
 338                 heads = discover_refs("git-upload-pack", for_push);
 339
 340         return heads->refs;
 341 }
 342
 343 static void output_refs(struct ref *refs)
 344 {
 345         struct ref *posn;
 346         for (posn = refs; posn; posn = posn->next) {
 347                 if (posn->symref)
 348                         printf("@%s %s\n", posn->symref, posn->name);
 349                 else
 350                         printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 351         }
 352         printf("\n");
 353         fflush(stdout);
 354 }
 355
 356 struct rpc_state {
 357         const char *service_name;
 358         const char **argv;
 359         struct strbuf *stdin_preamble;
 360         char *service_url;
 361         char *hdr_content_type;
 362         char *hdr_accept;
 363         char *buf;
 364         size_t alloc;
 365         size_t len;
 366         size_t pos;
 367         int in;
 368         int out;
 369         struct strbuf result;
 370         unsigned gzip_request : 1;
 371         unsigned initial_buffer : 1;
 372 };
 373
 374 static size_t rpc_out(void *ptr, size_t eltsize,
 375                 size_t nmemb, void *buffer_)
 376 {
 377         size_t max = eltsize * nmemb;
 378         struct rpc_state *rpc = buffer_;
 379         size_t avail = rpc->len - rpc->pos;
 380
 381         if (!avail) {
 382                 rpc->initial_buffer = 0;
 383                 avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 384                 if (!avail)
 385                         return 0;
 386                 rpc->pos = 0;
 387                 rpc->len = avail;
 388         }
 389
 390         if (max < avail)
 391                 avail = max;
 392         memcpy(ptr, rpc->buf + rpc->pos, avail);
 393         rpc->pos += avail;
 394         return avail;
 395 }
 396
 397 #ifndef NO_CURL_IOCTL
 398 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 399 {
 400         struct rpc_state *rpc = clientp;
 401
 402         switch (cmd) {
 403         case CURLIOCMD_NOP:
 404                 return CURLIOE_OK;
 405
 406         case CURLIOCMD_RESTARTREAD:
 407                 if (rpc->initial_buffer) {
 408                         rpc->pos = 0;
 409                         return CURLIOE_OK;
 410                 }
 411                 error("unable to rewind rpc post data - try increasing http.postBuffer");
 412                 return CURLIOE_FAILRESTART;
 413
 414         default:
 415                 return CURLIOE_UNKNOWNCMD;
 416         }
 417 }
 418 #endif
 419
 420 static size_t rpc_in(char *ptr, size_t eltsize,
 421                 size_t nmemb, void *buffer_)
 422 {
 423         size_t size = eltsize * nmemb;
 424         struct rpc_state *rpc = buffer_;
 425         write_or_die(rpc->in, ptr, size);
 426         return size;
 427 }
 428
 429 static int run_slot(struct active_request_slot *slot,
 430                     struct slot_results *results)
 431 {
 432         int err;
 433         struct slot_results results_buf;
 434
 435         if (!results)
 436                 results = &results_buf;
 437
 438         err = run_one_slot(slot, results);
 439
 440         if (err != HTTP_OK && err != HTTP_REAUTH) {
 441                 error("RPC failed; result=%d, HTTP code = %ld",
 442                       results->curl_result, results->http_code);
 443         }
 444
 445         return err;
 446 }
 447
 448 static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 449 {
 450         struct active_request_slot *slot;
 451         struct curl_slist *headers = NULL;
 452         struct strbuf buf = STRBUF_INIT;
 453         int err;
 454
 455         slot = get_active_slot();
 456
 457         headers = curl_slist_append(headers, rpc->hdr_content_type);
 458         headers = curl_slist_append(headers, rpc->hdr_accept);
 459
 460         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 461         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 462         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 463         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 464         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 465         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 466         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 467         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 468         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 469
 470         err = run_slot(slot, results);
 471
 472         curl_slist_free_all(headers);
 473         strbuf_release(&buf);
 474         return err;
 475 }
 476
 477 static int post_rpc(struct rpc_state *rpc)
 478 {
 479         struct active_request_slot *slot;
 480         struct curl_slist *headers = NULL;
 481         int use_gzip = rpc->gzip_request;
 482         char *gzip_body = NULL;
 483         size_t gzip_size = 0;
 484         int err, large_request = 0;
 485         int needs_100_continue = 0;
 486
 487         /* Try to load the entire request, if we can fit it into the
 488          * allocated buffer space we can use HTTP/1.0 and avoid the
 489          * chunked encoding mess.
 490          */
 491         while (1) {
 492                 size_t left = rpc->alloc - rpc->len;
 493                 char *buf = rpc->buf + rpc->len;
 494                 int n;
 495
 496                 if (left < LARGE_PACKET_MAX) {
 497                         large_request = 1;
 498                         use_gzip = 0;
 499                         break;
 500                 }
 501
 502                 n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 503                 if (!n)
 504                         break;
 505                 rpc->len += n;
 506         }
 507
 508         if (large_request) {
 509                 struct slot_results results;
 510
 511                 do {
 512                         err = probe_rpc(rpc, &results);
 513                         if (err == HTTP_REAUTH)
 514                                 credential_fill(&http_auth);
 515                 } while (err == HTTP_REAUTH);
 516                 if (err != HTTP_OK)
 517                         return -1;
 518
 519                 if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 520                         needs_100_continue = 1;
 521         }
 522
 523         headers = curl_slist_append(headers, rpc->hdr_content_type);
 524         headers = curl_slist_append(headers, rpc->hdr_accept);
 525         headers = curl_slist_append(headers, needs_100_continue ?
 526                 "Expect: 100-continue" : "Expect:");
 527
 528 retry:
 529         slot = get_active_slot();
 530
 531         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 532         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 533         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 534         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 535
 536         if (large_request) {
 537                 /* The request body is large and the size cannot be predicted.
 538                  * We must use chunked encoding to send it.
 539                  */
 540                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 541                 rpc->initial_buffer = 1;
 542                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 543                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 544 #ifndef NO_CURL_IOCTL
 545                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 546                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 547 #endif
 548                 if (options.verbosity > 1) {
 549                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 550                         fflush(stderr);
 551                 }
 552
 553         } else if (gzip_body) {
 554                 /*
 555                  * If we are looping to retry authentication, then the previous
 556                  * run will have set up the headers and gzip buffer already,
 557                  * and we just need to send it.
 558                  */
 559                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 560                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 561
 562         } else if (use_gzip && 1024 < rpc->len) {
 563                 /* The client backend isn't giving us compressed data so
 564                  * we can try to deflate it ourselves, this may save on.
 565                  * the transfer time.
 566                  */
 567                 git_zstream stream;
 568                 int ret;
 569
 570                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 571                 gzip_size = git_deflate_bound(&stream, rpc->len);
 572                 gzip_body = xmalloc(gzip_size);
 573
 574                 stream.next_in = (unsigned char *)rpc->buf;
 575                 stream.avail_in = rpc->len;
 576                 stream.next_out = (unsigned char *)gzip_body;
 577                 stream.avail_out = gzip_size;
 578
 579                 ret = git_deflate(&stream, Z_FINISH);
 580                 if (ret != Z_STREAM_END)
 581                         die("cannot deflate request; zlib deflate error %d", ret);
 582
 583                 ret = git_deflate_end_gently(&stream);
 584                 if (ret != Z_OK)
 585                         die("cannot deflate request; zlib end error %d", ret);
 586
 587                 gzip_size = stream.total_out;
 588
 589                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 590                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 591                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 592
 593                 if (options.verbosity > 1) {
 594                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 595                                 rpc->service_name,
 596                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
 597                         fflush(stderr);
 598                 }
 599         } else {
 600                 /* We know the complete request size in advance, use the
 601                  * more normal Content-Length approach.
 602                  */
 603                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 604                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 605                 if (options.verbosity > 1) {
 606                         fprintf(stderr, "POST %s (%lu bytes)\n",
 607                                 rpc->service_name, (unsigned long)rpc->len);
 608                         fflush(stderr);
 609                 }
 610         }
 611
 612         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 613         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 614         curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 615
 616         err = run_slot(slot, NULL);
 617         if (err == HTTP_REAUTH && !large_request) {
 618                 credential_fill(&http_auth);
 619                 goto retry;
 620         }
 621         if (err != HTTP_OK)
 622                 err = -1;
 623
 624         curl_slist_free_all(headers);
 625         free(gzip_body);
 626         return err;
 627 }
 628
 629 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 630 {
 631         const char *svc = rpc->service_name;
 632         struct strbuf buf = STRBUF_INIT;
 633         struct strbuf *preamble = rpc->stdin_preamble;
 634         struct child_process client = CHILD_PROCESS_INIT;
 635         int err = 0;
 636
 637         client.in = -1;
 638         client.out = -1;
 639         client.git_cmd = 1;
 640         client.argv = rpc->argv;
 641         if (start_command(&client))
 642                 exit(1);
 643         if (preamble)
 644                 write_or_die(client.in, preamble->buf, preamble->len);
 645         if (heads)
 646                 write_or_die(client.in, heads->buf, heads->len);
 647
 648         rpc->alloc = http_post_buffer;
 649         rpc->buf = xmalloc(rpc->alloc);
 650         rpc->in = client.in;
 651         rpc->out = client.out;
 652         strbuf_init(&rpc->result, 0);
 653
 654         strbuf_addf(&buf, "%s%s", url.buf, svc);
 655         rpc->service_url = strbuf_detach(&buf, NULL);
 656
 657         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 658         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 659
 660         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 661         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 662
 663         while (!err) {
 664                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 665                 if (!n)
 666                         break;
 667                 rpc->pos = 0;
 668                 rpc->len = n;
 669                 err |= post_rpc(rpc);
 670         }
 671
 672         close(client.in);
 673         client.in = -1;
 674         if (!err) {
 675                 strbuf_read(&rpc->result, client.out, 0);
 676         } else {
 677                 char buf[4096];
 678                 for (;;)
 679                         if (xread(client.out, buf, sizeof(buf)) <= 0)
 680                                 break;
 681         }
 682
 683         close(client.out);
 684         client.out = -1;
 685
 686         err |= finish_command(&client);
 687         free(rpc->service_url);
 688         free(rpc->hdr_content_type);
 689         free(rpc->hdr_accept);
 690         free(rpc->buf);
 691         strbuf_release(&buf);
 692         return err;
 693 }
 694
 695 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 696 {
 697         struct walker *walker;
 698         char **targets = xmalloc(nr_heads * sizeof(char*));
 699         int ret, i;
 700
 701         if (options.depth)
 702                 die("dumb http transport does not support --depth");
 703         for (i = 0; i < nr_heads; i++)
 704                 targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 705
 706         walker = get_http_walker(url.buf);
 707         walker->get_all = 1;
 708         walker->get_tree = 1;
 709         walker->get_history = 1;
 710         walker->get_verbosely = options.verbosity >= 3;
 711         walker->get_recover = 0;
 712         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 713         walker_free(walker);
 714
 715         for (i = 0; i < nr_heads; i++)
 716                 free(targets[i]);
 717         free(targets);
 718
 719         return ret ? error("fetch failed.") : 0;
 720 }
 721
 722 static int fetch_git(struct discovery *heads,
 723         int nr_heads, struct ref **to_fetch)
 724 {
 725         struct rpc_state rpc;
 726         struct strbuf preamble = STRBUF_INIT;
 727         char *depth_arg = NULL;
 728         int argc = 0, i, err;
 729         const char *argv[17];
 730
 731         argv[argc++] = "fetch-pack";
 732         argv[argc++] = "--stateless-rpc";
 733         argv[argc++] = "--stdin";
 734         argv[argc++] = "--lock-pack";
 735         if (options.followtags)
 736                 argv[argc++] = "--include-tag";
 737         if (options.thin)
 738                 argv[argc++] = "--thin";
 739         if (options.verbosity >= 3) {
 740                 argv[argc++] = "-v";
 741                 argv[argc++] = "-v";
 742         }
 743         if (options.check_self_contained_and_connected)
 744                 argv[argc++] = "--check-self-contained-and-connected";
 745         if (options.cloning)
 746                 argv[argc++] = "--cloning";
 747         if (options.update_shallow)
 748                 argv[argc++] = "--update-shallow";
 749         if (!options.progress)
 750                 argv[argc++] = "--no-progress";
 751         if (options.depth) {
 752                 struct strbuf buf = STRBUF_INIT;
 753                 strbuf_addf(&buf, "--depth=%lu", options.depth);
 754                 depth_arg = strbuf_detach(&buf, NULL);
 755                 argv[argc++] = depth_arg;
 756         }
 757         argv[argc++] = url.buf;
 758         argv[argc++] = NULL;
 759
 760         for (i = 0; i < nr_heads; i++) {
 761                 struct ref *ref = to_fetch[i];
 762                 if (!*ref->name)
 763                         die("cannot fetch by sha1 over smart http");
 764                 packet_buf_write(&preamble, "%s %s\n",
 765                                  sha1_to_hex(ref->old_sha1), ref->name);
 766         }
 767         packet_buf_flush(&preamble);
 768
 769         memset(&rpc, 0, sizeof(rpc));
 770         rpc.service_name = "git-upload-pack",
 771         rpc.argv = argv;
 772         rpc.stdin_preamble = &preamble;
 773         rpc.gzip_request = 1;
 774
 775         err = rpc_service(&rpc, heads);
 776         if (rpc.result.len)
 777                 write_or_die(1, rpc.result.buf, rpc.result.len);
 778         strbuf_release(&rpc.result);
 779         strbuf_release(&preamble);
 780         free(depth_arg);
 781         return err;
 782 }
 783
 784 static int fetch(int nr_heads, struct ref **to_fetch)
 785 {
 786         struct discovery *d = discover_refs("git-upload-pack", 0);
 787         if (d->proto_git)
 788                 return fetch_git(d, nr_heads, to_fetch);
 789         else
 790                 return fetch_dumb(nr_heads, to_fetch);
 791 }
 792
 793 static void parse_fetch(struct strbuf *buf)
 794 {
 795         struct ref **to_fetch = NULL;
 796         struct ref *list_head = NULL;
 797         struct ref **list = &list_head;
 798         int alloc_heads = 0, nr_heads = 0;
 799
 800         do {
 801                 const char *p;
 802                 if (skip_prefix(buf->buf, "fetch ", &p)) {
 803                         const char *name;
 804                         struct ref *ref;
 805                         unsigned char old_sha1[20];
 806
 807                         if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 808                                 die("protocol error: expected sha/ref, got %s'", p);
 809                         if (p[40] == ' ')
 810                                 name = p + 41;
 811                         else if (!p[40])
 812                                 name = "";
 813                         else
 814                                 die("protocol error: expected sha/ref, got %s'", p);
 815
 816                         ref = alloc_ref(name);
 817                         hashcpy(ref->old_sha1, old_sha1);
 818
 819                         *list = ref;
 820                         list = &ref->next;
 821
 822                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 823                         to_fetch[nr_heads++] = ref;
 824                 }
 825                 else
 826                         die("http transport does not support %s", buf->buf);
 827
 828                 strbuf_reset(buf);
 829                 if (strbuf_getline(buf, stdin, '\n') == EOF)
 830                         return;
 831                 if (!*buf->buf)
 832                         break;
 833         } while (1);
 834
 835         if (fetch(nr_heads, to_fetch))
 836                 exit(128); /* error already reported */
 837         free_refs(list_head);
 838         free(to_fetch);
 839
 840         printf("\n");
 841         fflush(stdout);
 842         strbuf_reset(buf);
 843 }
 844
 845 static int push_dav(int nr_spec, char **specs)
 846 {
 847         const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 848         int argc = 0, i;
 849
 850         argv[argc++] = "http-push";
 851         argv[argc++] = "--helper-status";
 852         if (options.dry_run)
 853                 argv[argc++] = "--dry-run";
 854         if (options.verbosity > 1)
 855                 argv[argc++] = "--verbose";
 856         argv[argc++] = url.buf;
 857         for (i = 0; i < nr_spec; i++)
 858                 argv[argc++] = specs[i];
 859         argv[argc++] = NULL;
 860
 861         if (run_command_v_opt(argv, RUN_GIT_CMD))
 862                 die("git-%s failed", argv[0]);
 863         free(argv);
 864         return 0;
 865 }
 866
 867 static int push_git(struct discovery *heads, int nr_spec, char **specs)
 868 {
 869         struct rpc_state rpc;
 870         int i, err;
 871         struct argv_array args;
 872         struct string_list_item *cas_option;
 873         struct strbuf preamble = STRBUF_INIT;
 874
 875         argv_array_init(&args);
 876         argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 877                          NULL);
 878
 879         if (options.thin)
 880                 argv_array_push(&args, "--thin");
 881         if (options.dry_run)
 882                 argv_array_push(&args, "--dry-run");
 883         if (options.push_cert)
 884                 argv_array_push(&args, "--signed");
 885         if (options.verbosity == 0)
 886                 argv_array_push(&args, "--quiet");
 887         else if (options.verbosity > 1)
 888                 argv_array_push(&args, "--verbose");
 889         argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 890         for_each_string_list_item(cas_option, &cas_options)
 891                 argv_array_push(&args, cas_option->string);
 892         argv_array_push(&args, url.buf);
 893
 894         argv_array_push(&args, "--stdin");
 895         for (i = 0; i < nr_spec; i++)
 896                 packet_buf_write(&preamble, "%s\n", specs[i]);
 897         packet_buf_flush(&preamble);
 898
 899         memset(&rpc, 0, sizeof(rpc));
 900         rpc.service_name = "git-receive-pack",
 901         rpc.argv = args.argv;
 902         rpc.stdin_preamble = &preamble;
 903
 904         err = rpc_service(&rpc, heads);
 905         if (rpc.result.len)
 906                 write_or_die(1, rpc.result.buf, rpc.result.len);
 907         strbuf_release(&rpc.result);
 908         strbuf_release(&preamble);
 909         argv_array_clear(&args);
 910         return err;
 911 }
 912
 913 static int push(int nr_spec, char **specs)
 914 {
 915         struct discovery *heads = discover_refs("git-receive-pack", 1);
 916         int ret;
 917
 918         if (heads->proto_git)
 919                 ret = push_git(heads, nr_spec, specs);
 920         else
 921                 ret = push_dav(nr_spec, specs);
 922         free_discovery(heads);
 923         return ret;
 924 }
 925
 926 static void parse_push(struct strbuf *buf)
 927 {
 928         char **specs = NULL;
 929         int alloc_spec = 0, nr_spec = 0, i, ret;
 930
 931         do {
 932                 if (starts_with(buf->buf, "push ")) {
 933                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 934                         specs[nr_spec++] = xstrdup(buf->buf + 5);
 935                 }
 936                 else
 937                         die("http transport does not support %s", buf->buf);
 938
 939                 strbuf_reset(buf);
 940                 if (strbuf_getline(buf, stdin, '\n') == EOF)
 941                         goto free_specs;
 942                 if (!*buf->buf)
 943                         break;
 944         } while (1);
 945
 946         ret = push(nr_spec, specs);
 947         printf("\n");
 948         fflush(stdout);
 949
 950         if (ret)
 951                 exit(128); /* error already reported */
 952
 953  free_specs:
 954         for (i = 0; i < nr_spec; i++)
 955                 free(specs[i]);
 956         free(specs);
 957 }
 958
 959 int main(int argc, const char **argv)
 960 {
 961         struct strbuf buf = STRBUF_INIT;
 962         int nongit;
 963
 964         git_extract_argv0_path(argv[0]);
 965         setup_git_directory_gently(&nongit);
 966         if (argc < 2) {
 967                 error("remote-curl: usage: git remote-curl <remote> [<url>]");
 968                 return 1;
 969         }
 970
 971         options.verbosity = 1;
 972         options.progress = !!isatty(2);
 973         options.thin = 1;
 974
 975         remote = remote_get(argv[1]);
 976
 977         if (argc > 2) {
 978                 end_url_with_slash(&url, argv[2]);
 979         } else {
 980                 end_url_with_slash(&url, remote->url[0]);
 981         }
 982
 983         http_init(remote, url.buf, 0);
 984
 985         do {
 986                 const char *arg;
 987
 988                 if (strbuf_getline(&buf, stdin, '\n') == EOF) {
 989                         if (ferror(stdin))
 990                                 error("remote-curl: error reading command stream from git");
 991                         return 1;
 992                 }
 993                 if (buf.len == 0)
 994                         break;
 995                 if (starts_with(buf.buf, "fetch ")) {
 996                         if (nongit)
 997                                 die("remote-curl: fetch attempted without a local repo");
 998                         parse_fetch(&buf);
 999
1000                 } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1001                         int for_push = !!strstr(buf.buf + 4, "for-push");
1002                         output_refs(get_refs(for_push));
1003
1004                 } else if (starts_with(buf.buf, "push ")) {
1005                         parse_push(&buf);
1006
1007                 } else if (skip_prefix(buf.buf, "option ", &arg)) {
1008                         char *value = strchr(arg, ' ');
1009                         int result;
1010
1011                         if (value)
1012                                 *value++ = '\0';
1013                         else
1014                                 value = "true";
1015
1016                         result = set_option(arg, value);
1017                         if (!result)
1018                                 printf("ok\n");
1019                         else if (result < 0)
1020                                 printf("error invalid value\n");
1021                         else
1022                                 printf("unsupported\n");
1023                         fflush(stdout);
1024
1025                 } else if (!strcmp(buf.buf, "capabilities")) {
1026                         printf("fetch\n");
1027                         printf("option\n");
1028                         printf("push\n");
1029                         printf("check-connectivity\n");
1030                         printf("\n");
1031                         fflush(stdout);
1032                 } else {
1033                         error("remote-curl: unknown command '%s' from git", buf.buf);
1034                         return 1;
1035                 }
1036                 strbuf_reset(&buf);
1037         } while (1);
1038
1039         http_cleanup();
1040
1041         return 0;
1042 }