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