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