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