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