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