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