remote-curl.c

   1 #include "cache.h"
   2 #include "remote.h"
   3 #include "strbuf.h"
   4 #include "walker.h"
   5 #include "http.h"
   6 #include "exec_cmd.h"
   7 #include "run-command.h"
   8 #include "pkt-line.h"
   9 #include "sideband.h"
  10 #include "argv-array.h"
  11 #include "credential.h"
  12
  13 static struct remote *remote;
  14 /* always ends with a trailing slash */
  15 static struct strbuf url = STRBUF_INIT;
  16
  17 struct options {
  18         int verbosity;
  19         unsigned long depth;
  20         unsigned progress : 1,
  21                 followtags : 1,
  22                 dry_run : 1,
  23                 thin : 1;
  24 };
  25 static struct options options;
  26
  27 static int set_option(const char *name, const char *value)
  28 {
  29         if (!strcmp(name, "verbosity")) {
  30                 char *end;
  31                 int v = strtol(value, &end, 10);
  32                 if (value == end || *end)
  33                         return -1;
  34                 options.verbosity = v;
  35                 return 0;
  36         }
  37         else if (!strcmp(name, "progress")) {
  38                 if (!strcmp(value, "true"))
  39                         options.progress = 1;
  40                 else if (!strcmp(value, "false"))
  41                         options.progress = 0;
  42                 else
  43                         return -1;
  44                 return 0;
  45         }
  46         else if (!strcmp(name, "depth")) {
  47                 char *end;
  48                 unsigned long v = strtoul(value, &end, 10);
  49                 if (value == end || *end)
  50                         return -1;
  51                 options.depth = v;
  52                 return 0;
  53         }
  54         else if (!strcmp(name, "followtags")) {
  55                 if (!strcmp(value, "true"))
  56                         options.followtags = 1;
  57                 else if (!strcmp(value, "false"))
  58                         options.followtags = 0;
  59                 else
  60                         return -1;
  61                 return 0;
  62         }
  63         else if (!strcmp(name, "dry-run")) {
  64                 if (!strcmp(value, "true"))
  65                         options.dry_run = 1;
  66                 else if (!strcmp(value, "false"))
  67                         options.dry_run = 0;
  68                 else
  69                         return -1;
  70                 return 0;
  71         }
  72         else {
  73                 return 1 /* unsupported */;
  74         }
  75 }
  76
  77 struct discovery {
  78         const char *service;
  79         char *buf_alloc;
  80         char *buf;
  81         size_t len;
  82         struct ref *refs;
  83         unsigned proto_git : 1;
  84 };
  85 static struct discovery *last_discovery;
  86
  87 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
  88 {
  89         struct ref *list = NULL;
  90         get_remote_heads(-1, heads->buf, heads->len, &list,
  91                          for_push ? REF_NORMAL : 0, NULL);
  92         return list;
  93 }
  94
  95 static struct ref *parse_info_refs(struct discovery *heads)
  96 {
  97         char *data, *start, *mid;
  98         char *ref_name;
  99         int i = 0;
 100
 101         struct ref *refs = NULL;
 102         struct ref *ref = NULL;
 103         struct ref *last_ref = NULL;
 104
 105         data = heads->buf;
 106         start = NULL;
 107         mid = data;
 108         while (i < heads->len) {
 109                 if (!start) {
 110                         start = &data[i];
 111                 }
 112                 if (data[i] == '\t')
 113                         mid = &data[i];
 114                 if (data[i] == '\n') {
 115                         if (mid - start != 40)
 116                                 die("%sinfo/refs not valid: is this a git repository?",
 117                                     url.buf);
 118                         data[i] = 0;
 119                         ref_name = mid + 1;
 120                         ref = xmalloc(sizeof(struct ref) +
 121                                       strlen(ref_name) + 1);
 122                         memset(ref, 0, sizeof(struct ref));
 123                         strcpy(ref->name, ref_name);
 124                         get_sha1_hex(start, ref->old_sha1);
 125                         if (!refs)
 126                                 refs = ref;
 127                         if (last_ref)
 128                                 last_ref->next = ref;
 129                         last_ref = ref;
 130                         start = NULL;
 131                 }
 132                 i++;
 133         }
 134
 135         ref = alloc_ref("HEAD");
 136         if (!http_fetch_ref(url.buf, ref) &&
 137             !resolve_remote_symref(ref, refs)) {
 138                 ref->next = refs;
 139                 refs = ref;
 140         } else {
 141                 free(ref);
 142         }
 143
 144         return refs;
 145 }
 146
 147 static void free_discovery(struct discovery *d)
 148 {
 149         if (d) {
 150                 if (d == last_discovery)
 151                         last_discovery = NULL;
 152                 free(d->buf_alloc);
 153                 free_refs(d->refs);
 154                 free(d);
 155         }
 156 }
 157
 158 static int show_http_message(struct strbuf *type, struct strbuf *msg)
 159 {
 160         const char *p, *eol;
 161
 162         /*
 163          * We only show text/plain parts, as other types are likely
 164          * to be ugly to look at on the user's terminal.
 165          *
 166          * TODO should handle "; charset=XXX", and re-encode into
 167          * logoutputencoding
 168          */
 169         if (strcasecmp(type->buf, "text/plain"))
 170                 return -1;
 171
 172         strbuf_trim(msg);
 173         if (!msg->len)
 174                 return -1;
 175
 176         p = msg->buf;
 177         do {
 178                 eol = strchrnul(p, '\n');
 179                 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 180                 p = eol + 1;
 181         } while(*eol);
 182         return 0;
 183 }
 184
 185 static struct discovery* discover_refs(const char *service, int for_push)
 186 {
 187         struct strbuf exp = STRBUF_INIT;
 188         struct strbuf type = STRBUF_INIT;
 189         struct strbuf buffer = STRBUF_INIT;
 190         struct strbuf refs_url = STRBUF_INIT;
 191         struct strbuf effective_url = STRBUF_INIT;
 192         struct discovery *last = last_discovery;
 193         int http_ret, maybe_smart = 0;
 194         struct http_get_options options;
 195
 196         if (last && !strcmp(service, last->service))
 197                 return last;
 198         free_discovery(last);
 199
 200         strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 201         if ((!prefixcmp(url.buf, "http://") || !prefixcmp(url.buf, "https://")) &&
 202              git_env_bool("GIT_SMART_HTTP", 1)) {
 203                 maybe_smart = 1;
 204                 if (!strchr(url.buf, '?'))
 205                         strbuf_addch(&refs_url, '?');
 206                 else
 207                         strbuf_addch(&refs_url, '&');
 208                 strbuf_addf(&refs_url, "service=%s", service);
 209         }
 210
 211         memset(&options, 0, sizeof(options));
 212         options.content_type = &type;
 213         options.effective_url = &effective_url;
 214         options.base_url = &url;
 215         options.no_cache = 1;
 216         options.keep_error = 1;
 217
 218         http_ret = http_get_strbuf(refs_url.buf, &buffer, &options);
 219         switch (http_ret) {
 220         case HTTP_OK:
 221                 break;
 222         case HTTP_MISSING_TARGET:
 223                 show_http_message(&type, &buffer);
 224                 die("repository '%s' not found", url.buf);
 225         case HTTP_NOAUTH:
 226                 show_http_message(&type, &buffer);
 227                 die("Authentication failed for '%s'", url.buf);
 228         default:
 229                 show_http_message(&type, &buffer);
 230                 die("unable to access '%s': %s", url.buf, curl_errorstr);
 231         }
 232
 233         last= xcalloc(1, sizeof(*last_discovery));
 234         last->service = service;
 235         last->buf_alloc = strbuf_detach(&buffer, &last->len);
 236         last->buf = last->buf_alloc;
 237
 238         strbuf_addf(&exp, "application/x-%s-advertisement", service);
 239         if (maybe_smart &&
 240             (5 <= last->len && last->buf[4] == '#') &&
 241             !strbuf_cmp(&exp, &type)) {
 242                 char *line;
 243
 244                 /*
 245                  * smart HTTP response; validate that the service
 246                  * pkt-line matches our request.
 247                  */
 248                 line = packet_read_line_buf(&last->buf, &last->len, NULL);
 249
 250                 strbuf_reset(&exp);
 251                 strbuf_addf(&exp, "# service=%s", service);
 252                 if (strcmp(line, exp.buf))
 253                         die("invalid server response; got '%s'", line);
 254                 strbuf_release(&exp);
 255
 256                 /* The header can include additional metadata lines, up
 257                  * until a packet flush marker.  Ignore these now, but
 258                  * in the future we might start to scan them.
 259                  */
 260                 while (packet_read_line_buf(&last->buf, &last->len, NULL))
 261                         ;
 262
 263                 last->proto_git = 1;
 264         }
 265
 266         if (last->proto_git)
 267                 last->refs = parse_git_refs(last, for_push);
 268         else
 269                 last->refs = parse_info_refs(last);
 270
 271         strbuf_release(&refs_url);
 272         strbuf_release(&exp);
 273         strbuf_release(&type);
 274         strbuf_release(&effective_url);
 275         strbuf_release(&buffer);
 276         last_discovery = last;
 277         return last;
 278 }
 279
 280 static struct ref *get_refs(int for_push)
 281 {
 282         struct discovery *heads;
 283
 284         if (for_push)
 285                 heads = discover_refs("git-receive-pack", for_push);
 286         else
 287                 heads = discover_refs("git-upload-pack", for_push);
 288
 289         return heads->refs;
 290 }
 291
 292 static void output_refs(struct ref *refs)
 293 {
 294         struct ref *posn;
 295         for (posn = refs; posn; posn = posn->next) {
 296                 if (posn->symref)
 297                         printf("@%s %s\n", posn->symref, posn->name);
 298                 else
 299                         printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 300         }
 301         printf("\n");
 302         fflush(stdout);
 303 }
 304
 305 struct rpc_state {
 306         const char *service_name;
 307         const char **argv;
 308         struct strbuf *stdin_preamble;
 309         char *service_url;
 310         char *hdr_content_type;
 311         char *hdr_accept;
 312         char *buf;
 313         size_t alloc;
 314         size_t len;
 315         size_t pos;
 316         int in;
 317         int out;
 318         struct strbuf result;
 319         unsigned gzip_request : 1;
 320         unsigned initial_buffer : 1;
 321 };
 322
 323 static size_t rpc_out(void *ptr, size_t eltsize,
 324                 size_t nmemb, void *buffer_)
 325 {
 326         size_t max = eltsize * nmemb;
 327         struct rpc_state *rpc = buffer_;
 328         size_t avail = rpc->len - rpc->pos;
 329
 330         if (!avail) {
 331                 rpc->initial_buffer = 0;
 332                 avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 333                 if (!avail)
 334                         return 0;
 335                 rpc->pos = 0;
 336                 rpc->len = avail;
 337         }
 338
 339         if (max < avail)
 340                 avail = max;
 341         memcpy(ptr, rpc->buf + rpc->pos, avail);
 342         rpc->pos += avail;
 343         return avail;
 344 }
 345
 346 #ifndef NO_CURL_IOCTL
 347 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 348 {
 349         struct rpc_state *rpc = clientp;
 350
 351         switch (cmd) {
 352         case CURLIOCMD_NOP:
 353                 return CURLIOE_OK;
 354
 355         case CURLIOCMD_RESTARTREAD:
 356                 if (rpc->initial_buffer) {
 357                         rpc->pos = 0;
 358                         return CURLIOE_OK;
 359                 }
 360                 fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
 361                 return CURLIOE_FAILRESTART;
 362
 363         default:
 364                 return CURLIOE_UNKNOWNCMD;
 365         }
 366 }
 367 #endif
 368
 369 static size_t rpc_in(char *ptr, size_t eltsize,
 370                 size_t nmemb, void *buffer_)
 371 {
 372         size_t size = eltsize * nmemb;
 373         struct rpc_state *rpc = buffer_;
 374         write_or_die(rpc->in, ptr, size);
 375         return size;
 376 }
 377
 378 static int run_slot(struct active_request_slot *slot)
 379 {
 380         int err;
 381         struct slot_results results;
 382
 383         slot->results = &results;
 384         slot->curl_result = curl_easy_perform(slot->curl);
 385         finish_active_slot(slot);
 386
 387         err = handle_curl_result(&results);
 388         if (err != HTTP_OK && err != HTTP_REAUTH) {
 389                 error("RPC failed; result=%d, HTTP code = %ld",
 390                       results.curl_result, results.http_code);
 391         }
 392
 393         return err;
 394 }
 395
 396 static int probe_rpc(struct rpc_state *rpc)
 397 {
 398         struct active_request_slot *slot;
 399         struct curl_slist *headers = NULL;
 400         struct strbuf buf = STRBUF_INIT;
 401         int err;
 402
 403         slot = get_active_slot();
 404
 405         headers = curl_slist_append(headers, rpc->hdr_content_type);
 406         headers = curl_slist_append(headers, rpc->hdr_accept);
 407
 408         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 409         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 410         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 411         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 412         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 413         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 414         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 415         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 416         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 417
 418         err = run_slot(slot);
 419
 420         curl_slist_free_all(headers);
 421         strbuf_release(&buf);
 422         return err;
 423 }
 424
 425 static int post_rpc(struct rpc_state *rpc)
 426 {
 427         struct active_request_slot *slot;
 428         struct curl_slist *headers = NULL;
 429         int use_gzip = rpc->gzip_request;
 430         char *gzip_body = NULL;
 431         size_t gzip_size = 0;
 432         int err, large_request = 0;
 433
 434         /* Try to load the entire request, if we can fit it into the
 435          * allocated buffer space we can use HTTP/1.0 and avoid the
 436          * chunked encoding mess.
 437          */
 438         while (1) {
 439                 size_t left = rpc->alloc - rpc->len;
 440                 char *buf = rpc->buf + rpc->len;
 441                 int n;
 442
 443                 if (left < LARGE_PACKET_MAX) {
 444                         large_request = 1;
 445                         use_gzip = 0;
 446                         break;
 447                 }
 448
 449                 n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 450                 if (!n)
 451                         break;
 452                 rpc->len += n;
 453         }
 454
 455         if (large_request) {
 456                 do {
 457                         err = probe_rpc(rpc);
 458                         if (err == HTTP_REAUTH)
 459                                 credential_fill(&http_auth);
 460                 } while (err == HTTP_REAUTH);
 461                 if (err != HTTP_OK)
 462                         return -1;
 463         }
 464
 465         headers = curl_slist_append(headers, rpc->hdr_content_type);
 466         headers = curl_slist_append(headers, rpc->hdr_accept);
 467         headers = curl_slist_append(headers, "Expect:");
 468
 469 retry:
 470         slot = get_active_slot();
 471
 472         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 473         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 474         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 475         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 476
 477         if (large_request) {
 478                 /* The request body is large and the size cannot be predicted.
 479                  * We must use chunked encoding to send it.
 480                  */
 481                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 482                 rpc->initial_buffer = 1;
 483                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 484                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 485 #ifndef NO_CURL_IOCTL
 486                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 487                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 488 #endif
 489                 if (options.verbosity > 1) {
 490                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 491                         fflush(stderr);
 492                 }
 493
 494         } else if (gzip_body) {
 495                 /*
 496                  * If we are looping to retry authentication, then the previous
 497                  * run will have set up the headers and gzip buffer already,
 498                  * and we just need to send it.
 499                  */
 500                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 501                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 502
 503         } else if (use_gzip && 1024 < rpc->len) {
 504                 /* The client backend isn't giving us compressed data so
 505                  * we can try to deflate it ourselves, this may save on.
 506                  * the transfer time.
 507                  */
 508                 git_zstream stream;
 509                 int ret;
 510
 511                 memset(&stream, 0, sizeof(stream));
 512                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 513                 gzip_size = git_deflate_bound(&stream, rpc->len);
 514                 gzip_body = xmalloc(gzip_size);
 515
 516                 stream.next_in = (unsigned char *)rpc->buf;
 517                 stream.avail_in = rpc->len;
 518                 stream.next_out = (unsigned char *)gzip_body;
 519                 stream.avail_out = gzip_size;
 520
 521                 ret = git_deflate(&stream, Z_FINISH);
 522                 if (ret != Z_STREAM_END)
 523                         die("cannot deflate request; zlib deflate error %d", ret);
 524
 525                 ret = git_deflate_end_gently(&stream);
 526                 if (ret != Z_OK)
 527                         die("cannot deflate request; zlib end error %d", ret);
 528
 529                 gzip_size = stream.total_out;
 530
 531                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 532                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 533                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 534
 535                 if (options.verbosity > 1) {
 536                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 537                                 rpc->service_name,
 538                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
 539                         fflush(stderr);
 540                 }
 541         } else {
 542                 /* We know the complete request size in advance, use the
 543                  * more normal Content-Length approach.
 544                  */
 545                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 546                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 547                 if (options.verbosity > 1) {
 548                         fprintf(stderr, "POST %s (%lu bytes)\n",
 549                                 rpc->service_name, (unsigned long)rpc->len);
 550                         fflush(stderr);
 551                 }
 552         }
 553
 554         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 555         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 556         curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 557
 558         err = run_slot(slot);
 559         if (err == HTTP_REAUTH && !large_request) {
 560                 credential_fill(&http_auth);
 561                 goto retry;
 562         }
 563         if (err != HTTP_OK)
 564                 err = -1;
 565
 566         curl_slist_free_all(headers);
 567         free(gzip_body);
 568         return err;
 569 }
 570
 571 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 572 {
 573         const char *svc = rpc->service_name;
 574         struct strbuf buf = STRBUF_INIT;
 575         struct strbuf *preamble = rpc->stdin_preamble;
 576         struct child_process client;
 577         int err = 0;
 578
 579         memset(&client, 0, sizeof(client));
 580         client.in = -1;
 581         client.out = -1;
 582         client.git_cmd = 1;
 583         client.argv = rpc->argv;
 584         if (start_command(&client))
 585                 exit(1);
 586         if (preamble)
 587                 write_or_die(client.in, preamble->buf, preamble->len);
 588         if (heads)
 589                 write_or_die(client.in, heads->buf, heads->len);
 590
 591         rpc->alloc = http_post_buffer;
 592         rpc->buf = xmalloc(rpc->alloc);
 593         rpc->in = client.in;
 594         rpc->out = client.out;
 595         strbuf_init(&rpc->result, 0);
 596
 597         strbuf_addf(&buf, "%s%s", url.buf, svc);
 598         rpc->service_url = strbuf_detach(&buf, NULL);
 599
 600         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 601         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 602
 603         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 604         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 605
 606         while (!err) {
 607                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 608                 if (!n)
 609                         break;
 610                 rpc->pos = 0;
 611                 rpc->len = n;
 612                 err |= post_rpc(rpc);
 613         }
 614
 615         close(client.in);
 616         client.in = -1;
 617         if (!err) {
 618                 strbuf_read(&rpc->result, client.out, 0);
 619         } else {
 620                 char buf[4096];
 621                 for (;;)
 622                         if (xread(client.out, buf, sizeof(buf)) <= 0)
 623                                 break;
 624         }
 625
 626         close(client.out);
 627         client.out = -1;
 628
 629         err |= finish_command(&client);
 630         free(rpc->service_url);
 631         free(rpc->hdr_content_type);
 632         free(rpc->hdr_accept);
 633         free(rpc->buf);
 634         strbuf_release(&buf);
 635         return err;
 636 }
 637
 638 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 639 {
 640         struct walker *walker;
 641         char **targets = xmalloc(nr_heads * sizeof(char*));
 642         int ret, i;
 643
 644         if (options.depth)
 645                 die("dumb http transport does not support --depth");
 646         for (i = 0; i < nr_heads; i++)
 647                 targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 648
 649         walker = get_http_walker(url.buf);
 650         walker->get_all = 1;
 651         walker->get_tree = 1;
 652         walker->get_history = 1;
 653         walker->get_verbosely = options.verbosity >= 3;
 654         walker->get_recover = 0;
 655         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 656         walker_free(walker);
 657
 658         for (i = 0; i < nr_heads; i++)
 659                 free(targets[i]);
 660         free(targets);
 661
 662         return ret ? error("Fetch failed.") : 0;
 663 }
 664
 665 static int fetch_git(struct discovery *heads,
 666         int nr_heads, struct ref **to_fetch)
 667 {
 668         struct rpc_state rpc;
 669         struct strbuf preamble = STRBUF_INIT;
 670         char *depth_arg = NULL;
 671         int argc = 0, i, err;
 672         const char *argv[15];
 673
 674         argv[argc++] = "fetch-pack";
 675         argv[argc++] = "--stateless-rpc";
 676         argv[argc++] = "--stdin";
 677         argv[argc++] = "--lock-pack";
 678         if (options.followtags)
 679                 argv[argc++] = "--include-tag";
 680         if (options.thin)
 681                 argv[argc++] = "--thin";
 682         if (options.verbosity >= 3) {
 683                 argv[argc++] = "-v";
 684                 argv[argc++] = "-v";
 685         }
 686         if (!options.progress)
 687                 argv[argc++] = "--no-progress";
 688         if (options.depth) {
 689                 struct strbuf buf = STRBUF_INIT;
 690                 strbuf_addf(&buf, "--depth=%lu", options.depth);
 691                 depth_arg = strbuf_detach(&buf, NULL);
 692                 argv[argc++] = depth_arg;
 693         }
 694         argv[argc++] = url.buf;
 695         argv[argc++] = NULL;
 696
 697         for (i = 0; i < nr_heads; i++) {
 698                 struct ref *ref = to_fetch[i];
 699                 if (!ref->name || !*ref->name)
 700                         die("cannot fetch by sha1 over smart http");
 701                 packet_buf_write(&preamble, "%s\n", ref->name);
 702         }
 703         packet_buf_flush(&preamble);
 704
 705         memset(&rpc, 0, sizeof(rpc));
 706         rpc.service_name = "git-upload-pack",
 707         rpc.argv = argv;
 708         rpc.stdin_preamble = &preamble;
 709         rpc.gzip_request = 1;
 710
 711         err = rpc_service(&rpc, heads);
 712         if (rpc.result.len)
 713                 write_or_die(1, rpc.result.buf, rpc.result.len);
 714         strbuf_release(&rpc.result);
 715         strbuf_release(&preamble);
 716         free(depth_arg);
 717         return err;
 718 }
 719
 720 static int fetch(int nr_heads, struct ref **to_fetch)
 721 {
 722         struct discovery *d = discover_refs("git-upload-pack", 0);
 723         if (d->proto_git)
 724                 return fetch_git(d, nr_heads, to_fetch);
 725         else
 726                 return fetch_dumb(nr_heads, to_fetch);
 727 }
 728
 729 static void parse_fetch(struct strbuf *buf)
 730 {
 731         struct ref **to_fetch = NULL;
 732         struct ref *list_head = NULL;
 733         struct ref **list = &list_head;
 734         int alloc_heads = 0, nr_heads = 0;
 735
 736         do {
 737                 if (!prefixcmp(buf->buf, "fetch ")) {
 738                         char *p = buf->buf + strlen("fetch ");
 739                         char *name;
 740                         struct ref *ref;
 741                         unsigned char old_sha1[20];
 742
 743                         if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 744                                 die("protocol error: expected sha/ref, got %s'", p);
 745                         if (p[40] == ' ')
 746                                 name = p + 41;
 747                         else if (!p[40])
 748                                 name = "";
 749                         else
 750                                 die("protocol error: expected sha/ref, got %s'", p);
 751
 752                         ref = alloc_ref(name);
 753                         hashcpy(ref->old_sha1, old_sha1);
 754
 755                         *list = ref;
 756                         list = &ref->next;
 757
 758                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 759                         to_fetch[nr_heads++] = ref;
 760                 }
 761                 else
 762                         die("http transport does not support %s", buf->buf);
 763
 764                 strbuf_reset(buf);
 765                 if (strbuf_getline(buf, stdin, '\n') == EOF)
 766                         return;
 767                 if (!*buf->buf)
 768                         break;
 769         } while (1);
 770
 771         if (fetch(nr_heads, to_fetch))
 772                 exit(128); /* error already reported */
 773         free_refs(list_head);
 774         free(to_fetch);
 775
 776         printf("\n");
 777         fflush(stdout);
 778         strbuf_reset(buf);
 779 }
 780
 781 static int push_dav(int nr_spec, char **specs)
 782 {
 783         const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 784         int argc = 0, i;
 785
 786         argv[argc++] = "http-push";
 787         argv[argc++] = "--helper-status";
 788         if (options.dry_run)
 789                 argv[argc++] = "--dry-run";
 790         if (options.verbosity > 1)
 791                 argv[argc++] = "--verbose";
 792         argv[argc++] = url.buf;
 793         for (i = 0; i < nr_spec; i++)
 794                 argv[argc++] = specs[i];
 795         argv[argc++] = NULL;
 796
 797         if (run_command_v_opt(argv, RUN_GIT_CMD))
 798                 die("git-%s failed", argv[0]);
 799         free(argv);
 800         return 0;
 801 }
 802
 803 static int push_git(struct discovery *heads, int nr_spec, char **specs)
 804 {
 805         struct rpc_state rpc;
 806         int i, err;
 807         struct argv_array args;
 808
 809         argv_array_init(&args);
 810         argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 811                          NULL);
 812
 813         if (options.thin)
 814                 argv_array_push(&args, "--thin");
 815         if (options.dry_run)
 816                 argv_array_push(&args, "--dry-run");
 817         if (options.verbosity == 0)
 818                 argv_array_push(&args, "--quiet");
 819         else if (options.verbosity > 1)
 820                 argv_array_push(&args, "--verbose");
 821         argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 822         argv_array_push(&args, url.buf);
 823         for (i = 0; i < nr_spec; i++)
 824                 argv_array_push(&args, specs[i]);
 825
 826         memset(&rpc, 0, sizeof(rpc));
 827         rpc.service_name = "git-receive-pack",
 828         rpc.argv = args.argv;
 829
 830         err = rpc_service(&rpc, heads);
 831         if (rpc.result.len)
 832                 write_or_die(1, rpc.result.buf, rpc.result.len);
 833         strbuf_release(&rpc.result);
 834         argv_array_clear(&args);
 835         return err;
 836 }
 837
 838 static int push(int nr_spec, char **specs)
 839 {
 840         struct discovery *heads = discover_refs("git-receive-pack", 1);
 841         int ret;
 842
 843         if (heads->proto_git)
 844                 ret = push_git(heads, nr_spec, specs);
 845         else
 846                 ret = push_dav(nr_spec, specs);
 847         free_discovery(heads);
 848         return ret;
 849 }
 850
 851 static void parse_push(struct strbuf *buf)
 852 {
 853         char **specs = NULL;
 854         int alloc_spec = 0, nr_spec = 0, i, ret;
 855
 856         do {
 857                 if (!prefixcmp(buf->buf, "push ")) {
 858                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 859                         specs[nr_spec++] = xstrdup(buf->buf + 5);
 860                 }
 861                 else
 862                         die("http transport does not support %s", buf->buf);
 863
 864                 strbuf_reset(buf);
 865                 if (strbuf_getline(buf, stdin, '\n') == EOF)
 866                         goto free_specs;
 867                 if (!*buf->buf)
 868                         break;
 869         } while (1);
 870
 871         ret = push(nr_spec, specs);
 872         printf("\n");
 873         fflush(stdout);
 874
 875         if (ret)
 876                 exit(128); /* error already reported */
 877
 878  free_specs:
 879         for (i = 0; i < nr_spec; i++)
 880                 free(specs[i]);
 881         free(specs);
 882 }
 883
 884 int main(int argc, const char **argv)
 885 {
 886         struct strbuf buf = STRBUF_INIT;
 887         int nongit;
 888
 889         git_extract_argv0_path(argv[0]);
 890         setup_git_directory_gently(&nongit);
 891         if (argc < 2) {
 892                 fprintf(stderr, "Remote needed\n");
 893                 return 1;
 894         }
 895
 896         options.verbosity = 1;
 897         options.progress = !!isatty(2);
 898         options.thin = 1;
 899
 900         remote = remote_get(argv[1]);
 901
 902         if (argc > 2) {
 903                 end_url_with_slash(&url, argv[2]);
 904         } else {
 905                 end_url_with_slash(&url, remote->url[0]);
 906         }
 907
 908         http_init(remote, url.buf, 0);
 909
 910         do {
 911                 if (strbuf_getline(&buf, stdin, '\n') == EOF) {
 912                         if (ferror(stdin))
 913                                 fprintf(stderr, "Error reading command stream\n");
 914                         else
 915                                 fprintf(stderr, "Unexpected end of command stream\n");
 916                         return 1;
 917                 }
 918                 if (buf.len == 0)
 919                         break;
 920                 if (!prefixcmp(buf.buf, "fetch ")) {
 921                         if (nongit)
 922                                 die("Fetch attempted without a local repo");
 923                         parse_fetch(&buf);
 924
 925                 } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
 926                         int for_push = !!strstr(buf.buf + 4, "for-push");
 927                         output_refs(get_refs(for_push));
 928
 929                 } else if (!prefixcmp(buf.buf, "push ")) {
 930                         parse_push(&buf);
 931
 932                 } else if (!prefixcmp(buf.buf, "option ")) {
 933                         char *name = buf.buf + strlen("option ");
 934                         char *value = strchr(name, ' ');
 935                         int result;
 936
 937                         if (value)
 938                                 *value++ = '\0';
 939                         else
 940                                 value = "true";
 941
 942                         result = set_option(name, value);
 943                         if (!result)
 944                                 printf("ok\n");
 945                         else if (result < 0)
 946                                 printf("error invalid value\n");
 947                         else
 948                                 printf("unsupported\n");
 949                         fflush(stdout);
 950
 951                 } else if (!strcmp(buf.buf, "capabilities")) {
 952                         printf("fetch\n");
 953                         printf("option\n");
 954                         printf("push\n");
 955                         printf("\n");
 956                         fflush(stdout);
 957                 } else {
 958                         fprintf(stderr, "Unknown command '%s'\n", buf.buf);
 959                         return 1;
 960                 }
 961                 strbuf_reset(&buf);
 962         } while (1);
 963
 964         http_cleanup();
 965
 966         return 0;
 967 }