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
  12 static struct remote *remote;
  13 static const char *url; /* always ends with a trailing slash */
  14
  15 struct options {
  16         int verbosity;
  17         unsigned long depth;
  18         unsigned progress : 1,
  19                 followtags : 1,
  20                 dry_run : 1,
  21                 thin : 1;
  22 };
  23 static struct options options;
  24 static struct string_list cas_options = STRING_LIST_INIT_DUP;
  25
  26 static int set_option(const char *name, const char *value)
  27 {
  28         if (!strcmp(name, "verbosity")) {
  29                 char *end;
  30                 int v = strtol(value, &end, 10);
  31                 if (value == end || *end)
  32                         return -1;
  33                 options.verbosity = v;
  34                 return 0;
  35         }
  36         else if (!strcmp(name, "progress")) {
  37                 if (!strcmp(value, "true"))
  38                         options.progress = 1;
  39                 else if (!strcmp(value, "false"))
  40                         options.progress = 0;
  41                 else
  42                         return -1;
  43                 return 0;
  44         }
  45         else if (!strcmp(name, "depth")) {
  46                 char *end;
  47                 unsigned long v = strtoul(value, &end, 10);
  48                 if (value == end || *end)
  49                         return -1;
  50                 options.depth = v;
  51                 return 0;
  52         }
  53         else if (!strcmp(name, "followtags")) {
  54                 if (!strcmp(value, "true"))
  55                         options.followtags = 1;
  56                 else if (!strcmp(value, "false"))
  57                         options.followtags = 0;
  58                 else
  59                         return -1;
  60                 return 0;
  61         }
  62         else if (!strcmp(name, "dry-run")) {
  63                 if (!strcmp(value, "true"))
  64                         options.dry_run = 1;
  65                 else if (!strcmp(value, "false"))
  66                         options.dry_run = 0;
  67                 else
  68                         return -1;
  69                 return 0;
  70         }
  71         else if (!strcmp(name, "cas")) {
  72                 struct strbuf val = STRBUF_INIT;
  73                 strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
  74                 string_list_append(&cas_options, val.buf);
  75                 strbuf_release(&val);
  76                 return 0;
  77         }
  78         else {
  79                 return 1 /* unsupported */;
  80         }
  81 }
  82
  83 struct discovery {
  84         const char *service;
  85         char *buf_alloc;
  86         char *buf;
  87         size_t len;
  88         struct ref *refs;
  89         unsigned proto_git : 1;
  90 };
  91 static struct discovery *last_discovery;
  92
  93 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
  94 {
  95         struct ref *list = NULL;
  96         get_remote_heads(-1, heads->buf, heads->len, &list,
  97                          for_push ? REF_NORMAL : 0, NULL);
  98         return list;
  99 }
 100
 101 static struct ref *parse_info_refs(struct discovery *heads)
 102 {
 103         char *data, *start, *mid;
 104         char *ref_name;
 105         int i = 0;
 106
 107         struct ref *refs = NULL;
 108         struct ref *ref = NULL;
 109         struct ref *last_ref = NULL;
 110
 111         data = heads->buf;
 112         start = NULL;
 113         mid = data;
 114         while (i < heads->len) {
 115                 if (!start) {
 116                         start = &data[i];
 117                 }
 118                 if (data[i] == '\t')
 119                         mid = &data[i];
 120                 if (data[i] == '\n') {
 121                         if (mid - start != 40)
 122                                 die("%sinfo/refs not valid: is this a git repository?", url);
 123                         data[i] = 0;
 124                         ref_name = mid + 1;
 125                         ref = xmalloc(sizeof(struct ref) +
 126                                       strlen(ref_name) + 1);
 127                         memset(ref, 0, sizeof(struct ref));
 128                         strcpy(ref->name, ref_name);
 129                         get_sha1_hex(start, ref->old_sha1);
 130                         if (!refs)
 131                                 refs = ref;
 132                         if (last_ref)
 133                                 last_ref->next = ref;
 134                         last_ref = ref;
 135                         start = NULL;
 136                 }
 137                 i++;
 138         }
 139
 140         ref = alloc_ref("HEAD");
 141         if (!http_fetch_ref(url, ref) &&
 142             !resolve_remote_symref(ref, refs)) {
 143                 ref->next = refs;
 144                 refs = ref;
 145         } else {
 146                 free(ref);
 147         }
 148
 149         return refs;
 150 }
 151
 152 static void free_discovery(struct discovery *d)
 153 {
 154         if (d) {
 155                 if (d == last_discovery)
 156                         last_discovery = NULL;
 157                 free(d->buf_alloc);
 158                 free_refs(d->refs);
 159                 free(d);
 160         }
 161 }
 162
 163 static int show_http_message(struct strbuf *type, struct strbuf *msg)
 164 {
 165         const char *p, *eol;
 166
 167         /*
 168          * We only show text/plain parts, as other types are likely
 169          * to be ugly to look at on the user's terminal.
 170          *
 171          * TODO should handle "; charset=XXX", and re-encode into
 172          * logoutputencoding
 173          */
 174         if (strcasecmp(type->buf, "text/plain"))
 175                 return -1;
 176
 177         strbuf_trim(msg);
 178         if (!msg->len)
 179                 return -1;
 180
 181         p = msg->buf;
 182         do {
 183                 eol = strchrnul(p, '\n');
 184                 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 185                 p = eol + 1;
 186         } while(*eol);
 187         return 0;
 188 }
 189
 190 static struct discovery* discover_refs(const char *service, int for_push)
 191 {
 192         struct strbuf exp = STRBUF_INIT;
 193         struct strbuf type = STRBUF_INIT;
 194         struct strbuf buffer = STRBUF_INIT;
 195         struct discovery *last = last_discovery;
 196         char *refs_url;
 197         int http_ret, maybe_smart = 0;
 198
 199         if (last && !strcmp(service, last->service))
 200                 return last;
 201         free_discovery(last);
 202
 203         strbuf_addf(&buffer, "%sinfo/refs", url);
 204         if ((!prefixcmp(url, "http://") || !prefixcmp(url, "https://")) &&
 205              git_env_bool("GIT_SMART_HTTP", 1)) {
 206                 maybe_smart = 1;
 207                 if (!strchr(url, '?'))
 208                         strbuf_addch(&buffer, '?');
 209                 else
 210                         strbuf_addch(&buffer, '&');
 211                 strbuf_addf(&buffer, "service=%s", service);
 212         }
 213         refs_url = strbuf_detach(&buffer, NULL);
 214
 215         http_ret = http_get_strbuf(refs_url, &type, &buffer,
 216                                    HTTP_NO_CACHE | HTTP_KEEP_ERROR);
 217         switch (http_ret) {
 218         case HTTP_OK:
 219                 break;
 220         case HTTP_MISSING_TARGET:
 221                 show_http_message(&type, &buffer);
 222                 die("repository '%s' not found", url);
 223         case HTTP_NOAUTH:
 224                 show_http_message(&type, &buffer);
 225                 die("Authentication failed for '%s'", url);
 226         default:
 227                 show_http_message(&type, &buffer);
 228                 die("unable to access '%s': %s", url, curl_errorstr);
 229         }
 230
 231         last= xcalloc(1, sizeof(*last_discovery));
 232         last->service = service;
 233         last->buf_alloc = strbuf_detach(&buffer, &last->len);
 234         last->buf = last->buf_alloc;
 235
 236         strbuf_addf(&exp, "application/x-%s-advertisement", service);
 237         if (maybe_smart &&
 238             (5 <= last->len && last->buf[4] == '#') &&
 239             !strbuf_cmp(&exp, &type)) {
 240                 char *line;
 241
 242                 /*
 243                  * smart HTTP response; validate that the service
 244                  * pkt-line matches our request.
 245                  */
 246                 line = packet_read_line_buf(&last->buf, &last->len, NULL);
 247
 248                 strbuf_reset(&exp);
 249                 strbuf_addf(&exp, "# service=%s", service);
 250                 if (strcmp(line, exp.buf))
 251                         die("invalid server response; got '%s'", line);
 252                 strbuf_release(&exp);
 253
 254                 /* The header can include additional metadata lines, up
 255                  * until a packet flush marker.  Ignore these now, but
 256                  * in the future we might start to scan them.
 257                  */
 258                 while (packet_read_line_buf(&last->buf, &last->len, NULL))
 259                         ;
 260
 261                 last->proto_git = 1;
 262         }
 263
 264         if (last->proto_git)
 265                 last->refs = parse_git_refs(last, for_push);
 266         else
 267                 last->refs = parse_info_refs(last);
 268
 269         free(refs_url);
 270         strbuf_release(&exp);
 271         strbuf_release(&type);
 272         strbuf_release(&buffer);
 273         last_discovery = last;
 274         return last;
 275 }
 276
 277 static struct ref *get_refs(int for_push)
 278 {
 279         struct discovery *heads;
 280
 281         if (for_push)
 282                 heads = discover_refs("git-receive-pack", for_push);
 283         else
 284                 heads = discover_refs("git-upload-pack", for_push);
 285
 286         return heads->refs;
 287 }
 288
 289 static void output_refs(struct ref *refs)
 290 {
 291         struct ref *posn;
 292         for (posn = refs; posn; posn = posn->next) {
 293                 if (posn->symref)
 294                         printf("@%s %s\n", posn->symref, posn->name);
 295                 else
 296                         printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 297         }
 298         printf("\n");
 299         fflush(stdout);
 300 }
 301
 302 struct rpc_state {
 303         const char *service_name;
 304         const char **argv;
 305         struct strbuf *stdin_preamble;
 306         char *service_url;
 307         char *hdr_content_type;
 308         char *hdr_accept;
 309         char *buf;
 310         size_t alloc;
 311         size_t len;
 312         size_t pos;
 313         int in;
 314         int out;
 315         struct strbuf result;
 316         unsigned gzip_request : 1;
 317         unsigned initial_buffer : 1;
 318 };
 319
 320 static size_t rpc_out(void *ptr, size_t eltsize,
 321                 size_t nmemb, void *buffer_)
 322 {
 323         size_t max = eltsize * nmemb;
 324         struct rpc_state *rpc = buffer_;
 325         size_t avail = rpc->len - rpc->pos;
 326
 327         if (!avail) {
 328                 rpc->initial_buffer = 0;
 329                 avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 330                 if (!avail)
 331                         return 0;
 332                 rpc->pos = 0;
 333                 rpc->len = avail;
 334         }
 335
 336         if (max < avail)
 337                 avail = max;
 338         memcpy(ptr, rpc->buf + rpc->pos, avail);
 339         rpc->pos += avail;
 340         return avail;
 341 }
 342
 343 #ifndef NO_CURL_IOCTL
 344 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 345 {
 346         struct rpc_state *rpc = clientp;
 347
 348         switch (cmd) {
 349         case CURLIOCMD_NOP:
 350                 return CURLIOE_OK;
 351
 352         case CURLIOCMD_RESTARTREAD:
 353                 if (rpc->initial_buffer) {
 354                         rpc->pos = 0;
 355                         return CURLIOE_OK;
 356                 }
 357                 fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
 358                 return CURLIOE_FAILRESTART;
 359
 360         default:
 361                 return CURLIOE_UNKNOWNCMD;
 362         }
 363 }
 364 #endif
 365
 366 static size_t rpc_in(char *ptr, size_t eltsize,
 367                 size_t nmemb, void *buffer_)
 368 {
 369         size_t size = eltsize * nmemb;
 370         struct rpc_state *rpc = buffer_;
 371         write_or_die(rpc->in, ptr, size);
 372         return size;
 373 }
 374
 375 static int run_slot(struct active_request_slot *slot)
 376 {
 377         int err;
 378         struct slot_results results;
 379
 380         slot->results = &results;
 381         slot->curl_result = curl_easy_perform(slot->curl);
 382         finish_active_slot(slot);
 383
 384         err = handle_curl_result(&results);
 385         if (err != HTTP_OK && err != HTTP_REAUTH) {
 386                 error("RPC failed; result=%d, HTTP code = %ld",
 387                       results.curl_result, results.http_code);
 388         }
 389
 390         return err;
 391 }
 392
 393 static int probe_rpc(struct rpc_state *rpc)
 394 {
 395         struct active_request_slot *slot;
 396         struct curl_slist *headers = NULL;
 397         struct strbuf buf = STRBUF_INIT;
 398         int err;
 399
 400         slot = get_active_slot();
 401
 402         headers = curl_slist_append(headers, rpc->hdr_content_type);
 403         headers = curl_slist_append(headers, rpc->hdr_accept);
 404
 405         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 406         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 407         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 408         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 409         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 410         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 411         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 412         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 413         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 414
 415         err = run_slot(slot);
 416
 417         curl_slist_free_all(headers);
 418         strbuf_release(&buf);
 419         return err;
 420 }
 421
 422 static int post_rpc(struct rpc_state *rpc)
 423 {
 424         struct active_request_slot *slot;
 425         struct curl_slist *headers = NULL;
 426         int use_gzip = rpc->gzip_request;
 427         char *gzip_body = NULL;
 428         size_t gzip_size = 0;
 429         int err, large_request = 0;
 430
 431         /* Try to load the entire request, if we can fit it into the
 432          * allocated buffer space we can use HTTP/1.0 and avoid the
 433          * chunked encoding mess.
 434          */
 435         while (1) {
 436                 size_t left = rpc->alloc - rpc->len;
 437                 char *buf = rpc->buf + rpc->len;
 438                 int n;
 439
 440                 if (left < LARGE_PACKET_MAX) {
 441                         large_request = 1;
 442                         use_gzip = 0;
 443                         break;
 444                 }
 445
 446                 n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 447                 if (!n)
 448                         break;
 449                 rpc->len += n;
 450         }
 451
 452         if (large_request) {
 453                 do {
 454                         err = probe_rpc(rpc);
 455                 } while (err == HTTP_REAUTH);
 456                 if (err != HTTP_OK)
 457                         return -1;
 458         }
 459
 460         headers = curl_slist_append(headers, rpc->hdr_content_type);
 461         headers = curl_slist_append(headers, rpc->hdr_accept);
 462         headers = curl_slist_append(headers, "Expect:");
 463
 464 retry:
 465         slot = get_active_slot();
 466
 467         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 468         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 469         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 470         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 471
 472         if (large_request) {
 473                 /* The request body is large and the size cannot be predicted.
 474                  * We must use chunked encoding to send it.
 475                  */
 476                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 477                 rpc->initial_buffer = 1;
 478                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 479                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 480 #ifndef NO_CURL_IOCTL
 481                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 482                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 483 #endif
 484                 if (options.verbosity > 1) {
 485                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 486                         fflush(stderr);
 487                 }
 488
 489         } else if (gzip_body) {
 490                 /*
 491                  * If we are looping to retry authentication, then the previous
 492                  * run will have set up the headers and gzip buffer already,
 493                  * and we just need to send it.
 494                  */
 495                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 496                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 497
 498         } else if (use_gzip && 1024 < rpc->len) {
 499                 /* The client backend isn't giving us compressed data so
 500                  * we can try to deflate it ourselves, this may save on.
 501                  * the transfer time.
 502                  */
 503                 git_zstream stream;
 504                 int ret;
 505
 506                 memset(&stream, 0, sizeof(stream));
 507                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 508                 gzip_size = git_deflate_bound(&stream, rpc->len);
 509                 gzip_body = xmalloc(gzip_size);
 510
 511                 stream.next_in = (unsigned char *)rpc->buf;
 512                 stream.avail_in = rpc->len;
 513                 stream.next_out = (unsigned char *)gzip_body;
 514                 stream.avail_out = gzip_size;
 515
 516                 ret = git_deflate(&stream, Z_FINISH);
 517                 if (ret != Z_STREAM_END)
 518                         die("cannot deflate request; zlib deflate error %d", ret);
 519
 520                 ret = git_deflate_end_gently(&stream);
 521                 if (ret != Z_OK)
 522                         die("cannot deflate request; zlib end error %d", ret);
 523
 524                 gzip_size = stream.total_out;
 525
 526                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 527                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 528                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 529
 530                 if (options.verbosity > 1) {
 531                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 532                                 rpc->service_name,
 533                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
 534                         fflush(stderr);
 535                 }
 536         } else {
 537                 /* We know the complete request size in advance, use the
 538                  * more normal Content-Length approach.
 539                  */
 540                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 541                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 542                 if (options.verbosity > 1) {
 543                         fprintf(stderr, "POST %s (%lu bytes)\n",
 544                                 rpc->service_name, (unsigned long)rpc->len);
 545                         fflush(stderr);
 546                 }
 547         }
 548
 549         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 550         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 551         curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 552
 553         err = run_slot(slot);
 554         if (err == HTTP_REAUTH && !large_request)
 555                 goto retry;
 556         if (err != HTTP_OK)
 557                 err = -1;
 558
 559         curl_slist_free_all(headers);
 560         free(gzip_body);
 561         return err;
 562 }
 563
 564 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 565 {
 566         const char *svc = rpc->service_name;
 567         struct strbuf buf = STRBUF_INIT;
 568         struct strbuf *preamble = rpc->stdin_preamble;
 569         struct child_process client;
 570         int err = 0;
 571
 572         memset(&client, 0, sizeof(client));
 573         client.in = -1;
 574         client.out = -1;
 575         client.git_cmd = 1;
 576         client.argv = rpc->argv;
 577         if (start_command(&client))
 578                 exit(1);
 579         if (preamble)
 580                 write_or_die(client.in, preamble->buf, preamble->len);
 581         if (heads)
 582                 write_or_die(client.in, heads->buf, heads->len);
 583
 584         rpc->alloc = http_post_buffer;
 585         rpc->buf = xmalloc(rpc->alloc);
 586         rpc->in = client.in;
 587         rpc->out = client.out;
 588         strbuf_init(&rpc->result, 0);
 589
 590         strbuf_addf(&buf, "%s%s", url, svc);
 591         rpc->service_url = strbuf_detach(&buf, NULL);
 592
 593         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 594         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 595
 596         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 597         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 598
 599         while (!err) {
 600                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 601                 if (!n)
 602                         break;
 603                 rpc->pos = 0;
 604                 rpc->len = n;
 605                 err |= post_rpc(rpc);
 606         }
 607
 608         close(client.in);
 609         client.in = -1;
 610         if (!err) {
 611                 strbuf_read(&rpc->result, client.out, 0);
 612         } else {
 613                 char buf[4096];
 614                 for (;;)
 615                         if (xread(client.out, buf, sizeof(buf)) <= 0)
 616                                 break;
 617         }
 618
 619         close(client.out);
 620         client.out = -1;
 621
 622         err |= finish_command(&client);
 623         free(rpc->service_url);
 624         free(rpc->hdr_content_type);
 625         free(rpc->hdr_accept);
 626         free(rpc->buf);
 627         strbuf_release(&buf);
 628         return err;
 629 }
 630
 631 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 632 {
 633         struct walker *walker;
 634         char **targets = xmalloc(nr_heads * sizeof(char*));
 635         int ret, i;
 636
 637         if (options.depth)
 638                 die("dumb http transport does not support --depth");
 639         for (i = 0; i < nr_heads; i++)
 640                 targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 641
 642         walker = get_http_walker(url);
 643         walker->get_all = 1;
 644         walker->get_tree = 1;
 645         walker->get_history = 1;
 646         walker->get_verbosely = options.verbosity >= 3;
 647         walker->get_recover = 0;
 648         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 649         walker_free(walker);
 650
 651         for (i = 0; i < nr_heads; i++)
 652                 free(targets[i]);
 653         free(targets);
 654
 655         return ret ? error("Fetch failed.") : 0;
 656 }
 657
 658 static int fetch_git(struct discovery *heads,
 659         int nr_heads, struct ref **to_fetch)
 660 {
 661         struct rpc_state rpc;
 662         struct strbuf preamble = STRBUF_INIT;
 663         char *depth_arg = NULL;
 664         int argc = 0, i, err;
 665         const char *argv[15];
 666
 667         argv[argc++] = "fetch-pack";
 668         argv[argc++] = "--stateless-rpc";
 669         argv[argc++] = "--stdin";
 670         argv[argc++] = "--lock-pack";
 671         if (options.followtags)
 672                 argv[argc++] = "--include-tag";
 673         if (options.thin)
 674                 argv[argc++] = "--thin";
 675         if (options.verbosity >= 3) {
 676                 argv[argc++] = "-v";
 677                 argv[argc++] = "-v";
 678         }
 679         if (!options.progress)
 680                 argv[argc++] = "--no-progress";
 681         if (options.depth) {
 682                 struct strbuf buf = STRBUF_INIT;
 683                 strbuf_addf(&buf, "--depth=%lu", options.depth);
 684                 depth_arg = strbuf_detach(&buf, NULL);
 685                 argv[argc++] = depth_arg;
 686         }
 687         argv[argc++] = url;
 688         argv[argc++] = NULL;
 689
 690         for (i = 0; i < nr_heads; i++) {
 691                 struct ref *ref = to_fetch[i];
 692                 if (!ref->name || !*ref->name)
 693                         die("cannot fetch by sha1 over smart http");
 694                 packet_buf_write(&preamble, "%s\n", ref->name);
 695         }
 696         packet_buf_flush(&preamble);
 697
 698         memset(&rpc, 0, sizeof(rpc));
 699         rpc.service_name = "git-upload-pack",
 700         rpc.argv = argv;
 701         rpc.stdin_preamble = &preamble;
 702         rpc.gzip_request = 1;
 703
 704         err = rpc_service(&rpc, heads);
 705         if (rpc.result.len)
 706                 write_or_die(1, rpc.result.buf, rpc.result.len);
 707         strbuf_release(&rpc.result);
 708         strbuf_release(&preamble);
 709         free(depth_arg);
 710         return err;
 711 }
 712
 713 static int fetch(int nr_heads, struct ref **to_fetch)
 714 {
 715         struct discovery *d = discover_refs("git-upload-pack", 0);
 716         if (d->proto_git)
 717                 return fetch_git(d, nr_heads, to_fetch);
 718         else
 719                 return fetch_dumb(nr_heads, to_fetch);
 720 }
 721
 722 static void parse_fetch(struct strbuf *buf)
 723 {
 724         struct ref **to_fetch = NULL;
 725         struct ref *list_head = NULL;
 726         struct ref **list = &list_head;
 727         int alloc_heads = 0, nr_heads = 0;
 728
 729         do {
 730                 if (!prefixcmp(buf->buf, "fetch ")) {
 731                         char *p = buf->buf + strlen("fetch ");
 732                         char *name;
 733                         struct ref *ref;
 734                         unsigned char old_sha1[20];
 735
 736                         if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 737                                 die("protocol error: expected sha/ref, got %s'", p);
 738                         if (p[40] == ' ')
 739                                 name = p + 41;
 740                         else if (!p[40])
 741                                 name = "";
 742                         else
 743                                 die("protocol error: expected sha/ref, got %s'", p);
 744
 745                         ref = alloc_ref(name);
 746                         hashcpy(ref->old_sha1, old_sha1);
 747
 748                         *list = ref;
 749                         list = &ref->next;
 750
 751                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 752                         to_fetch[nr_heads++] = ref;
 753                 }
 754                 else
 755                         die("http transport does not support %s", buf->buf);
 756
 757                 strbuf_reset(buf);
 758                 if (strbuf_getline(buf, stdin, '\n') == EOF)
 759                         return;
 760                 if (!*buf->buf)
 761                         break;
 762         } while (1);
 763
 764         if (fetch(nr_heads, to_fetch))
 765                 exit(128); /* error already reported */
 766         free_refs(list_head);
 767         free(to_fetch);
 768
 769         printf("\n");
 770         fflush(stdout);
 771         strbuf_reset(buf);
 772 }
 773
 774 static int push_dav(int nr_spec, char **specs)
 775 {
 776         const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 777         int argc = 0, i;
 778
 779         argv[argc++] = "http-push";
 780         argv[argc++] = "--helper-status";
 781         if (options.dry_run)
 782                 argv[argc++] = "--dry-run";
 783         if (options.verbosity > 1)
 784                 argv[argc++] = "--verbose";
 785         argv[argc++] = url;
 786         for (i = 0; i < nr_spec; i++)
 787                 argv[argc++] = specs[i];
 788         argv[argc++] = NULL;
 789
 790         if (run_command_v_opt(argv, RUN_GIT_CMD))
 791                 die("git-%s failed", argv[0]);
 792         free(argv);
 793         return 0;
 794 }
 795
 796 static int push_git(struct discovery *heads, int nr_spec, char **specs)
 797 {
 798         struct rpc_state rpc;
 799         const char **argv;
 800         int argc = 0, i, err;
 801         struct string_list_item *cas_option;
 802
 803         argv = xmalloc((10 + nr_spec + cas_options.nr) * sizeof(char *));
 804         argv[argc++] = "send-pack";
 805         argv[argc++] = "--stateless-rpc";
 806         argv[argc++] = "--helper-status";
 807         if (options.thin)
 808                 argv[argc++] = "--thin";
 809         if (options.dry_run)
 810                 argv[argc++] = "--dry-run";
 811         if (options.verbosity == 0)
 812                 argv[argc++] = "--quiet";
 813         else if (options.verbosity > 1)
 814                 argv[argc++] = "--verbose";
 815         argv[argc++] = options.progress ? "--progress" : "--no-progress";
 816
 817         for_each_string_list_item(cas_option, &cas_options)
 818                 argv[argc++] = cas_option->string;
 819
 820         argv[argc++] = url;
 821         for (i = 0; i < nr_spec; i++)
 822                 argv[argc++] = specs[i];
 823         argv[argc++] = NULL;
 824
 825         memset(&rpc, 0, sizeof(rpc));
 826         rpc.service_name = "git-receive-pack",
 827         rpc.argv = argv;
 828
 829         err = rpc_service(&rpc, heads);
 830         if (rpc.result.len)
 831                 write_or_die(1, rpc.result.buf, rpc.result.len);
 832         strbuf_release(&rpc.result);
 833         free(argv);
 834         return err;
 835 }
 836
 837 static int push(int nr_spec, char **specs)
 838 {
 839         struct discovery *heads = discover_refs("git-receive-pack", 1);
 840         int ret;
 841
 842         if (heads->proto_git)
 843                 ret = push_git(heads, nr_spec, specs);
 844         else
 845                 ret = push_dav(nr_spec, specs);
 846         free_discovery(heads);
 847         return ret;
 848 }
 849
 850 static void parse_push(struct strbuf *buf)
 851 {
 852         char **specs = NULL;
 853         int alloc_spec = 0, nr_spec = 0, i, ret;
 854
 855         do {
 856                 if (!prefixcmp(buf->buf, "push ")) {
 857                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 858                         specs[nr_spec++] = xstrdup(buf->buf + 5);
 859                 }
 860                 else
 861                         die("http transport does not support %s", buf->buf);
 862
 863                 strbuf_reset(buf);
 864                 if (strbuf_getline(buf, stdin, '\n') == EOF)
 865                         goto free_specs;
 866                 if (!*buf->buf)
 867                         break;
 868         } while (1);
 869
 870         ret = push(nr_spec, specs);
 871         printf("\n");
 872         fflush(stdout);
 873
 874         if (ret)
 875                 exit(128); /* error already reported */
 876
 877  free_specs:
 878         for (i = 0; i < nr_spec; i++)
 879                 free(specs[i]);
 880         free(specs);
 881 }
 882
 883 int main(int argc, const char **argv)
 884 {
 885         struct strbuf buf = STRBUF_INIT;
 886         int nongit;
 887
 888         git_extract_argv0_path(argv[0]);
 889         setup_git_directory_gently(&nongit);
 890         if (argc < 2) {
 891                 fprintf(stderr, "Remote needed\n");
 892                 return 1;
 893         }
 894
 895         options.verbosity = 1;
 896         options.progress = !!isatty(2);
 897         options.thin = 1;
 898
 899         remote = remote_get(argv[1]);
 900
 901         if (argc > 2) {
 902                 end_url_with_slash(&buf, argv[2]);
 903         } else {
 904                 end_url_with_slash(&buf, remote->url[0]);
 905         }
 906
 907         url = strbuf_detach(&buf, NULL);
 908
 909         http_init(remote, url, 0);
 910
 911         do {
 912                 if (strbuf_getline(&buf, stdin, '\n') == EOF) {
 913                         if (ferror(stdin))
 914                                 fprintf(stderr, "Error reading command stream\n");
 915                         else
 916                                 fprintf(stderr, "Unexpected end of command stream\n");
 917                         return 1;
 918                 }
 919                 if (buf.len == 0)
 920                         break;
 921                 if (!prefixcmp(buf.buf, "fetch ")) {
 922                         if (nongit)
 923                                 die("Fetch attempted without a local repo");
 924                         parse_fetch(&buf);
 925
 926                 } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
 927                         int for_push = !!strstr(buf.buf + 4, "for-push");
 928                         output_refs(get_refs(for_push));
 929
 930                 } else if (!prefixcmp(buf.buf, "push ")) {
 931                         parse_push(&buf);
 932
 933                 } else if (!prefixcmp(buf.buf, "option ")) {
 934                         char *name = buf.buf + strlen("option ");
 935                         char *value = strchr(name, ' ');
 936                         int result;
 937
 938                         if (value)
 939                                 *value++ = '\0';
 940                         else
 941                                 value = "true";
 942
 943                         result = set_option(name, value);
 944                         if (!result)
 945                                 printf("ok\n");
 946                         else if (result < 0)
 947                                 printf("error invalid value\n");
 948                         else
 949                                 printf("unsupported\n");
 950                         fflush(stdout);
 951
 952                 } else if (!strcmp(buf.buf, "capabilities")) {
 953                         printf("fetch\n");
 954                         printf("option\n");
 955                         printf("push\n");
 956                         printf("\n");
 957                         fflush(stdout);
 958                 } else {
 959                         fprintf(stderr, "Unknown command '%s'\n", buf.buf);
 960                         return 1;
 961                 }
 962                 strbuf_reset(&buf);
 963         } while (1);
 964
 965         http_cleanup();
 966
 967         return 0;
 968 }