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