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