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 "string-list.h"
  10 #include "sideband.h"
  11 #include "argv-array.h"
  12 #include "credential.h"
  13
  14 static struct remote *remote;
  15 /* always ends with a trailing slash */
  16 static struct strbuf url = STRBUF_INIT;
  17
  18 struct options {
  19         int verbosity;
  20         unsigned long depth;
  21         unsigned progress : 1,
  22                 check_self_contained_and_connected : 1,
  23                 followtags : 1,
  24                 dry_run : 1,
  25                 thin : 1;
  26 };
  27 static struct options options;
  28 static struct string_list cas_options = STRING_LIST_INIT_DUP;
  29
  30 static int set_option(const char *name, const char *value)
  31 {
  32         if (!strcmp(name, "verbosity")) {
  33                 char *end;
  34                 int v = strtol(value, &end, 10);
  35                 if (value == end || *end)
  36                         return -1;
  37                 options.verbosity = v;
  38                 return 0;
  39         }
  40         else if (!strcmp(name, "progress")) {
  41                 if (!strcmp(value, "true"))
  42                         options.progress = 1;
  43                 else if (!strcmp(value, "false"))
  44                         options.progress = 0;
  45                 else
  46                         return -1;
  47                 return 0;
  48         }
  49         else if (!strcmp(name, "depth")) {
  50                 char *end;
  51                 unsigned long v = strtoul(value, &end, 10);
  52                 if (value == end || *end)
  53                         return -1;
  54                 options.depth = v;
  55                 return 0;
  56         }
  57         else if (!strcmp(name, "followtags")) {
  58                 if (!strcmp(value, "true"))
  59                         options.followtags = 1;
  60                 else if (!strcmp(value, "false"))
  61                         options.followtags = 0;
  62                 else
  63                         return -1;
  64                 return 0;
  65         }
  66         else if (!strcmp(name, "dry-run")) {
  67                 if (!strcmp(value, "true"))
  68                         options.dry_run = 1;
  69                 else if (!strcmp(value, "false"))
  70                         options.dry_run = 0;
  71                 else
  72                         return -1;
  73                 return 0;
  74         }
  75         else if (!strcmp(name, "check-connectivity")) {
  76                 if (!strcmp(value, "true"))
  77                         options.check_self_contained_and_connected = 1;
  78                 else if (!strcmp(value, "false"))
  79                         options.check_self_contained_and_connected = 0;
  80                 else
  81                         return -1;
  82                 return 0;
  83         }
  84         else if (!strcmp(name, "cas")) {
  85                 struct strbuf val = STRBUF_INIT;
  86                 strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
  87                 string_list_append(&cas_options, val.buf);
  88                 strbuf_release(&val);
  89                 return 0;
  90         }
  91         else {
  92                 return 1 /* unsupported */;
  93         }
  94 }
  95
  96 struct discovery {
  97         const char *service;
  98         char *buf_alloc;
  99         char *buf;
 100         size_t len;
 101         struct ref *refs;
 102         unsigned proto_git : 1;
 103 };
 104 static struct discovery *last_discovery;
 105
 106 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 107 {
 108         struct ref *list = NULL;
 109         get_remote_heads(-1, heads->buf, heads->len, &list,
 110                          for_push ? REF_NORMAL : 0, NULL);
 111         return list;
 112 }
 113
 114 static struct ref *parse_info_refs(struct discovery *heads)
 115 {
 116         char *data, *start, *mid;
 117         char *ref_name;
 118         int i = 0;
 119
 120         struct ref *refs = NULL;
 121         struct ref *ref = NULL;
 122         struct ref *last_ref = NULL;
 123
 124         data = heads->buf;
 125         start = NULL;
 126         mid = data;
 127         while (i < heads->len) {
 128                 if (!start) {
 129                         start = &data[i];
 130                 }
 131                 if (data[i] == '\t')
 132                         mid = &data[i];
 133                 if (data[i] == '\n') {
 134                         if (mid - start != 40)
 135                                 die("%sinfo/refs not valid: is this a git repository?",
 136                                     url.buf);
 137                         data[i] = 0;
 138                         ref_name = mid + 1;
 139                         ref = xmalloc(sizeof(struct ref) +
 140                                       strlen(ref_name) + 1);
 141                         memset(ref, 0, sizeof(struct ref));
 142                         strcpy(ref->name, ref_name);
 143                         get_sha1_hex(start, ref->old_sha1);
 144                         if (!refs)
 145                                 refs = ref;
 146                         if (last_ref)
 147                                 last_ref->next = ref;
 148                         last_ref = ref;
 149                         start = NULL;
 150                 }
 151                 i++;
 152         }
 153
 154         ref = alloc_ref("HEAD");
 155         if (!http_fetch_ref(url.buf, ref) &&
 156             !resolve_remote_symref(ref, refs)) {
 157                 ref->next = refs;
 158                 refs = ref;
 159         } else {
 160                 free(ref);
 161         }
 162
 163         return refs;
 164 }
 165
 166 static void free_discovery(struct discovery *d)
 167 {
 168         if (d) {
 169                 if (d == last_discovery)
 170                         last_discovery = NULL;
 171                 free(d->buf_alloc);
 172                 free_refs(d->refs);
 173                 free(d);
 174         }
 175 }
 176
 177 static int show_http_message(struct strbuf *type, struct strbuf *msg)
 178 {
 179         const char *p, *eol;
 180
 181         /*
 182          * We only show text/plain parts, as other types are likely
 183          * to be ugly to look at on the user's terminal.
 184          *
 185          * TODO should handle "; charset=XXX", and re-encode into
 186          * logoutputencoding
 187          */
 188         if (strcasecmp(type->buf, "text/plain"))
 189                 return -1;
 190
 191         strbuf_trim(msg);
 192         if (!msg->len)
 193                 return -1;
 194
 195         p = msg->buf;
 196         do {
 197                 eol = strchrnul(p, '\n');
 198                 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 199                 p = eol + 1;
 200         } while(*eol);
 201         return 0;
 202 }
 203
 204 static struct discovery* discover_refs(const char *service, int for_push)
 205 {
 206         struct strbuf exp = STRBUF_INIT;
 207         struct strbuf type = STRBUF_INIT;
 208         struct strbuf buffer = STRBUF_INIT;
 209         struct strbuf refs_url = STRBUF_INIT;
 210         struct strbuf effective_url = STRBUF_INIT;
 211         struct discovery *last = last_discovery;
 212         int http_ret, maybe_smart = 0;
 213         struct http_get_options options;
 214
 215         if (last && !strcmp(service, last->service))
 216                 return last;
 217         free_discovery(last);
 218
 219         strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 220         if ((!prefixcmp(url.buf, "http://") || !prefixcmp(url.buf, "https://")) &&
 221              git_env_bool("GIT_SMART_HTTP", 1)) {
 222                 maybe_smart = 1;
 223                 if (!strchr(url.buf, '?'))
 224                         strbuf_addch(&refs_url, '?');
 225                 else
 226                         strbuf_addch(&refs_url, '&');
 227                 strbuf_addf(&refs_url, "service=%s", service);
 228         }
 229
 230         memset(&options, 0, sizeof(options));
 231         options.content_type = &type;
 232         options.effective_url = &effective_url;
 233         options.base_url = &url;
 234         options.no_cache = 1;
 235         options.keep_error = 1;
 236
 237         http_ret = http_get_strbuf(refs_url.buf, &buffer, &options);
 238         switch (http_ret) {
 239         case HTTP_OK:
 240                 break;
 241         case HTTP_MISSING_TARGET:
 242                 show_http_message(&type, &buffer);
 243                 die("repository '%s' not found", url.buf);
 244         case HTTP_NOAUTH:
 245                 show_http_message(&type, &buffer);
 246                 die("Authentication failed for '%s'", url.buf);
 247         default:
 248                 show_http_message(&type, &buffer);
 249                 die("unable to access '%s': %s", url.buf, curl_errorstr);
 250         }
 251
 252         last= xcalloc(1, sizeof(*last_discovery));
 253         last->service = service;
 254         last->buf_alloc = strbuf_detach(&buffer, &last->len);
 255         last->buf = last->buf_alloc;
 256
 257         strbuf_addf(&exp, "application/x-%s-advertisement", service);
 258         if (maybe_smart &&
 259             (5 <= last->len && last->buf[4] == '#') &&
 260             !strbuf_cmp(&exp, &type)) {
 261                 char *line;
 262
 263                 /*
 264                  * smart HTTP response; validate that the service
 265                  * pkt-line matches our request.
 266                  */
 267                 line = packet_read_line_buf(&last->buf, &last->len, NULL);
 268
 269                 strbuf_reset(&exp);
 270                 strbuf_addf(&exp, "# service=%s", service);
 271                 if (strcmp(line, exp.buf))
 272                         die("invalid server response; got '%s'", line);
 273                 strbuf_release(&exp);
 274
 275                 /* The header can include additional metadata lines, up
 276                  * until a packet flush marker.  Ignore these now, but
 277                  * in the future we might start to scan them.
 278                  */
 279                 while (packet_read_line_buf(&last->buf, &last->len, NULL))
 280                         ;
 281
 282                 last->proto_git = 1;
 283         }
 284
 285         if (last->proto_git)
 286                 last->refs = parse_git_refs(last, for_push);
 287         else
 288                 last->refs = parse_info_refs(last);
 289
 290         strbuf_release(&refs_url);
 291         strbuf_release(&exp);
 292         strbuf_release(&type);
 293         strbuf_release(&effective_url);
 294         strbuf_release(&buffer);
 295         last_discovery = last;
 296         return last;
 297 }
 298
 299 static struct ref *get_refs(int for_push)
 300 {
 301         struct discovery *heads;
 302
 303         if (for_push)
 304                 heads = discover_refs("git-receive-pack", for_push);
 305         else
 306                 heads = discover_refs("git-upload-pack", for_push);
 307
 308         return heads->refs;
 309 }
 310
 311 static void output_refs(struct ref *refs)
 312 {
 313         struct ref *posn;
 314         for (posn = refs; posn; posn = posn->next) {
 315                 if (posn->symref)
 316                         printf("@%s %s\n", posn->symref, posn->name);
 317                 else
 318                         printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 319         }
 320         printf("\n");
 321         fflush(stdout);
 322 }
 323
 324 struct rpc_state {
 325         const char *service_name;
 326         const char **argv;
 327         struct strbuf *stdin_preamble;
 328         char *service_url;
 329         char *hdr_content_type;
 330         char *hdr_accept;
 331         char *buf;
 332         size_t alloc;
 333         size_t len;
 334         size_t pos;
 335         int in;
 336         int out;
 337         struct strbuf result;
 338         unsigned gzip_request : 1;
 339         unsigned initial_buffer : 1;
 340 };
 341
 342 static size_t rpc_out(void *ptr, size_t eltsize,
 343                 size_t nmemb, void *buffer_)
 344 {
 345         size_t max = eltsize * nmemb;
 346         struct rpc_state *rpc = buffer_;
 347         size_t avail = rpc->len - rpc->pos;
 348
 349         if (!avail) {
 350                 rpc->initial_buffer = 0;
 351                 avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 352                 if (!avail)
 353                         return 0;
 354                 rpc->pos = 0;
 355                 rpc->len = avail;
 356         }
 357
 358         if (max < avail)
 359                 avail = max;
 360         memcpy(ptr, rpc->buf + rpc->pos, avail);
 361         rpc->pos += avail;
 362         return avail;
 363 }
 364
 365 #ifndef NO_CURL_IOCTL
 366 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 367 {
 368         struct rpc_state *rpc = clientp;
 369
 370         switch (cmd) {
 371         case CURLIOCMD_NOP:
 372                 return CURLIOE_OK;
 373
 374         case CURLIOCMD_RESTARTREAD:
 375                 if (rpc->initial_buffer) {
 376                         rpc->pos = 0;
 377                         return CURLIOE_OK;
 378                 }
 379                 fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
 380                 return CURLIOE_FAILRESTART;
 381
 382         default:
 383                 return CURLIOE_UNKNOWNCMD;
 384         }
 385 }
 386 #endif
 387
 388 static size_t rpc_in(char *ptr, size_t eltsize,
 389                 size_t nmemb, void *buffer_)
 390 {
 391         size_t size = eltsize * nmemb;
 392         struct rpc_state *rpc = buffer_;
 393         write_or_die(rpc->in, ptr, size);
 394         return size;
 395 }
 396
 397 static int run_slot(struct active_request_slot *slot)
 398 {
 399         int err;
 400         struct slot_results results;
 401
 402         slot->results = &results;
 403         slot->curl_result = curl_easy_perform(slot->curl);
 404         finish_active_slot(slot);
 405
 406         err = handle_curl_result(&results);
 407         if (err != HTTP_OK && err != HTTP_REAUTH) {
 408                 error("RPC failed; result=%d, HTTP code = %ld",
 409                       results.curl_result, results.http_code);
 410         }
 411
 412         return err;
 413 }
 414
 415 static int probe_rpc(struct rpc_state *rpc)
 416 {
 417         struct active_request_slot *slot;
 418         struct curl_slist *headers = NULL;
 419         struct strbuf buf = STRBUF_INIT;
 420         int err;
 421
 422         slot = get_active_slot();
 423
 424         headers = curl_slist_append(headers, rpc->hdr_content_type);
 425         headers = curl_slist_append(headers, rpc->hdr_accept);
 426
 427         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 428         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 429         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 430         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 431         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 432         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 433         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 434         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 435         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 436
 437         err = run_slot(slot);
 438
 439         curl_slist_free_all(headers);
 440         strbuf_release(&buf);
 441         return err;
 442 }
 443
 444 static int post_rpc(struct rpc_state *rpc)
 445 {
 446         struct active_request_slot *slot;
 447         struct curl_slist *headers = NULL;
 448         int use_gzip = rpc->gzip_request;
 449         char *gzip_body = NULL;
 450         size_t gzip_size = 0;
 451         int err, large_request = 0;
 452
 453         /* Try to load the entire request, if we can fit it into the
 454          * allocated buffer space we can use HTTP/1.0 and avoid the
 455          * chunked encoding mess.
 456          */
 457         while (1) {
 458                 size_t left = rpc->alloc - rpc->len;
 459                 char *buf = rpc->buf + rpc->len;
 460                 int n;
 461
 462                 if (left < LARGE_PACKET_MAX) {
 463                         large_request = 1;
 464                         use_gzip = 0;
 465                         break;
 466                 }
 467
 468                 n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 469                 if (!n)
 470                         break;
 471                 rpc->len += n;
 472         }
 473
 474         if (large_request) {
 475                 do {
 476                         err = probe_rpc(rpc);
 477                         if (err == HTTP_REAUTH)
 478                                 credential_fill(&http_auth);
 479                 } while (err == HTTP_REAUTH);
 480                 if (err != HTTP_OK)
 481                         return -1;
 482         }
 483
 484         headers = curl_slist_append(headers, rpc->hdr_content_type);
 485         headers = curl_slist_append(headers, rpc->hdr_accept);
 486         headers = curl_slist_append(headers, "Expect:");
 487
 488 retry:
 489         slot = get_active_slot();
 490
 491         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 492         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 493         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 494         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 495
 496         if (large_request) {
 497                 /* The request body is large and the size cannot be predicted.
 498                  * We must use chunked encoding to send it.
 499                  */
 500                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 501                 rpc->initial_buffer = 1;
 502                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 503                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 504 #ifndef NO_CURL_IOCTL
 505                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 506                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 507 #endif
 508                 if (options.verbosity > 1) {
 509                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 510                         fflush(stderr);
 511                 }
 512
 513         } else if (gzip_body) {
 514                 /*
 515                  * If we are looping to retry authentication, then the previous
 516                  * run will have set up the headers and gzip buffer already,
 517                  * and we just need to send it.
 518                  */
 519                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 520                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 521
 522         } else if (use_gzip && 1024 < rpc->len) {
 523                 /* The client backend isn't giving us compressed data so
 524                  * we can try to deflate it ourselves, this may save on.
 525                  * the transfer time.
 526                  */
 527                 git_zstream stream;
 528                 int ret;
 529
 530                 memset(&stream, 0, sizeof(stream));
 531                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 532                 gzip_size = git_deflate_bound(&stream, rpc->len);
 533                 gzip_body = xmalloc(gzip_size);
 534
 535                 stream.next_in = (unsigned char *)rpc->buf;
 536                 stream.avail_in = rpc->len;
 537                 stream.next_out = (unsigned char *)gzip_body;
 538                 stream.avail_out = gzip_size;
 539
 540                 ret = git_deflate(&stream, Z_FINISH);
 541                 if (ret != Z_STREAM_END)
 542                         die("cannot deflate request; zlib deflate error %d", ret);
 543
 544                 ret = git_deflate_end_gently(&stream);
 545                 if (ret != Z_OK)
 546                         die("cannot deflate request; zlib end error %d", ret);
 547
 548                 gzip_size = stream.total_out;
 549
 550                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 551                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 552                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 553
 554                 if (options.verbosity > 1) {
 555                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 556                                 rpc->service_name,
 557                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
 558                         fflush(stderr);
 559                 }
 560         } else {
 561                 /* We know the complete request size in advance, use the
 562                  * more normal Content-Length approach.
 563                  */
 564                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 565                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 566                 if (options.verbosity > 1) {
 567                         fprintf(stderr, "POST %s (%lu bytes)\n",
 568                                 rpc->service_name, (unsigned long)rpc->len);
 569                         fflush(stderr);
 570                 }
 571         }
 572
 573         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 574         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 575         curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 576
 577         err = run_slot(slot);
 578         if (err == HTTP_REAUTH && !large_request) {
 579                 credential_fill(&http_auth);
 580                 goto retry;
 581         }
 582         if (err != HTTP_OK)
 583                 err = -1;
 584
 585         curl_slist_free_all(headers);
 586         free(gzip_body);
 587         return err;
 588 }
 589
 590 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 591 {
 592         const char *svc = rpc->service_name;
 593         struct strbuf buf = STRBUF_INIT;
 594         struct strbuf *preamble = rpc->stdin_preamble;
 595         struct child_process client;
 596         int err = 0;
 597
 598         memset(&client, 0, sizeof(client));
 599         client.in = -1;
 600         client.out = -1;
 601         client.git_cmd = 1;
 602         client.argv = rpc->argv;
 603         if (start_command(&client))
 604                 exit(1);
 605         if (preamble)
 606                 write_or_die(client.in, preamble->buf, preamble->len);
 607         if (heads)
 608                 write_or_die(client.in, heads->buf, heads->len);
 609
 610         rpc->alloc = http_post_buffer;
 611         rpc->buf = xmalloc(rpc->alloc);
 612         rpc->in = client.in;
 613         rpc->out = client.out;
 614         strbuf_init(&rpc->result, 0);
 615
 616         strbuf_addf(&buf, "%s%s", url.buf, svc);
 617         rpc->service_url = strbuf_detach(&buf, NULL);
 618
 619         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 620         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 621
 622         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 623         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 624
 625         while (!err) {
 626                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 627                 if (!n)
 628                         break;
 629                 rpc->pos = 0;
 630                 rpc->len = n;
 631                 err |= post_rpc(rpc);
 632         }
 633
 634         close(client.in);
 635         client.in = -1;
 636         if (!err) {
 637                 strbuf_read(&rpc->result, client.out, 0);
 638         } else {
 639                 char buf[4096];
 640                 for (;;)
 641                         if (xread(client.out, buf, sizeof(buf)) <= 0)
 642                                 break;
 643         }
 644
 645         close(client.out);
 646         client.out = -1;
 647
 648         err |= finish_command(&client);
 649         free(rpc->service_url);
 650         free(rpc->hdr_content_type);
 651         free(rpc->hdr_accept);
 652         free(rpc->buf);
 653         strbuf_release(&buf);
 654         return err;
 655 }
 656
 657 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 658 {
 659         struct walker *walker;
 660         char **targets = xmalloc(nr_heads * sizeof(char*));
 661         int ret, i;
 662
 663         if (options.depth)
 664                 die("dumb http transport does not support --depth");
 665         for (i = 0; i < nr_heads; i++)
 666                 targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 667
 668         walker = get_http_walker(url.buf);
 669         walker->get_all = 1;
 670         walker->get_tree = 1;
 671         walker->get_history = 1;
 672         walker->get_verbosely = options.verbosity >= 3;
 673         walker->get_recover = 0;
 674         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 675         walker_free(walker);
 676
 677         for (i = 0; i < nr_heads; i++)
 678                 free(targets[i]);
 679         free(targets);
 680
 681         return ret ? error("Fetch failed.") : 0;
 682 }
 683
 684 static int fetch_git(struct discovery *heads,
 685         int nr_heads, struct ref **to_fetch)
 686 {
 687         struct rpc_state rpc;
 688         struct strbuf preamble = STRBUF_INIT;
 689         char *depth_arg = NULL;
 690         int argc = 0, i, err;
 691         const char *argv[16];
 692
 693         argv[argc++] = "fetch-pack";
 694         argv[argc++] = "--stateless-rpc";
 695         argv[argc++] = "--stdin";
 696         argv[argc++] = "--lock-pack";
 697         if (options.followtags)
 698                 argv[argc++] = "--include-tag";
 699         if (options.thin)
 700                 argv[argc++] = "--thin";
 701         if (options.verbosity >= 3) {
 702                 argv[argc++] = "-v";
 703                 argv[argc++] = "-v";
 704         }
 705         if (options.check_self_contained_and_connected)
 706                 argv[argc++] = "--check-self-contained-and-connected";
 707         if (!options.progress)
 708                 argv[argc++] = "--no-progress";
 709         if (options.depth) {
 710                 struct strbuf buf = STRBUF_INIT;
 711                 strbuf_addf(&buf, "--depth=%lu", options.depth);
 712                 depth_arg = strbuf_detach(&buf, NULL);
 713                 argv[argc++] = depth_arg;
 714         }
 715         argv[argc++] = url.buf;
 716         argv[argc++] = NULL;
 717
 718         for (i = 0; i < nr_heads; i++) {
 719                 struct ref *ref = to_fetch[i];
 720                 if (!ref->name || !*ref->name)
 721                         die("cannot fetch by sha1 over smart http");
 722                 packet_buf_write(&preamble, "%s\n", ref->name);
 723         }
 724         packet_buf_flush(&preamble);
 725
 726         memset(&rpc, 0, sizeof(rpc));
 727         rpc.service_name = "git-upload-pack",
 728         rpc.argv = argv;
 729         rpc.stdin_preamble = &preamble;
 730         rpc.gzip_request = 1;
 731
 732         err = rpc_service(&rpc, heads);
 733         if (rpc.result.len)
 734                 write_or_die(1, rpc.result.buf, rpc.result.len);
 735         strbuf_release(&rpc.result);
 736         strbuf_release(&preamble);
 737         free(depth_arg);
 738         return err;
 739 }
 740
 741 static int fetch(int nr_heads, struct ref **to_fetch)
 742 {
 743         struct discovery *d = discover_refs("git-upload-pack", 0);
 744         if (d->proto_git)
 745                 return fetch_git(d, nr_heads, to_fetch);
 746         else
 747                 return fetch_dumb(nr_heads, to_fetch);
 748 }
 749
 750 static void parse_fetch(struct strbuf *buf)
 751 {
 752         struct ref **to_fetch = NULL;
 753         struct ref *list_head = NULL;
 754         struct ref **list = &list_head;
 755         int alloc_heads = 0, nr_heads = 0;
 756
 757         do {
 758                 if (!prefixcmp(buf->buf, "fetch ")) {
 759                         char *p = buf->buf + strlen("fetch ");
 760                         char *name;
 761                         struct ref *ref;
 762                         unsigned char old_sha1[20];
 763
 764                         if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 765                                 die("protocol error: expected sha/ref, got %s'", p);
 766                         if (p[40] == ' ')
 767                                 name = p + 41;
 768                         else if (!p[40])
 769                                 name = "";
 770                         else
 771                                 die("protocol error: expected sha/ref, got %s'", p);
 772
 773                         ref = alloc_ref(name);
 774                         hashcpy(ref->old_sha1, old_sha1);
 775
 776                         *list = ref;
 777                         list = &ref->next;
 778
 779                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 780                         to_fetch[nr_heads++] = ref;
 781                 }
 782                 else
 783                         die("http transport does not support %s", buf->buf);
 784
 785                 strbuf_reset(buf);
 786                 if (strbuf_getline(buf, stdin, '\n') == EOF)
 787                         return;
 788                 if (!*buf->buf)
 789                         break;
 790         } while (1);
 791
 792         if (fetch(nr_heads, to_fetch))
 793                 exit(128); /* error already reported */
 794         free_refs(list_head);
 795         free(to_fetch);
 796
 797         printf("\n");
 798         fflush(stdout);
 799         strbuf_reset(buf);
 800 }
 801
 802 static int push_dav(int nr_spec, char **specs)
 803 {
 804         const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 805         int argc = 0, i;
 806
 807         argv[argc++] = "http-push";
 808         argv[argc++] = "--helper-status";
 809         if (options.dry_run)
 810                 argv[argc++] = "--dry-run";
 811         if (options.verbosity > 1)
 812                 argv[argc++] = "--verbose";
 813         argv[argc++] = url.buf;
 814         for (i = 0; i < nr_spec; i++)
 815                 argv[argc++] = specs[i];
 816         argv[argc++] = NULL;
 817
 818         if (run_command_v_opt(argv, RUN_GIT_CMD))
 819                 die("git-%s failed", argv[0]);
 820         free(argv);
 821         return 0;
 822 }
 823
 824 static int push_git(struct discovery *heads, int nr_spec, char **specs)
 825 {
 826         struct rpc_state rpc;
 827         int i, err;
 828         struct argv_array args;
 829         struct string_list_item *cas_option;
 830
 831         argv_array_init(&args);
 832         argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 833                          NULL);
 834
 835         if (options.thin)
 836                 argv_array_push(&args, "--thin");
 837         if (options.dry_run)
 838                 argv_array_push(&args, "--dry-run");
 839         if (options.verbosity == 0)
 840                 argv_array_push(&args, "--quiet");
 841         else if (options.verbosity > 1)
 842                 argv_array_push(&args, "--verbose");
 843         argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 844         for_each_string_list_item(cas_option, &cas_options)
 845                 argv_array_push(&args, cas_option->string);
 846         argv_array_push(&args, url.buf);
 847         for (i = 0; i < nr_spec; i++)
 848                 argv_array_push(&args, specs[i]);
 849
 850         memset(&rpc, 0, sizeof(rpc));
 851         rpc.service_name = "git-receive-pack",
 852         rpc.argv = args.argv;
 853
 854         err = rpc_service(&rpc, heads);
 855         if (rpc.result.len)
 856                 write_or_die(1, rpc.result.buf, rpc.result.len);
 857         strbuf_release(&rpc.result);
 858         argv_array_clear(&args);
 859         return err;
 860 }
 861
 862 static int push(int nr_spec, char **specs)
 863 {
 864         struct discovery *heads = discover_refs("git-receive-pack", 1);
 865         int ret;
 866
 867         if (heads->proto_git)
 868                 ret = push_git(heads, nr_spec, specs);
 869         else
 870                 ret = push_dav(nr_spec, specs);
 871         free_discovery(heads);
 872         return ret;
 873 }
 874
 875 static void parse_push(struct strbuf *buf)
 876 {
 877         char **specs = NULL;
 878         int alloc_spec = 0, nr_spec = 0, i, ret;
 879
 880         do {
 881                 if (!prefixcmp(buf->buf, "push ")) {
 882                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 883                         specs[nr_spec++] = xstrdup(buf->buf + 5);
 884                 }
 885                 else
 886                         die("http transport does not support %s", buf->buf);
 887
 888                 strbuf_reset(buf);
 889                 if (strbuf_getline(buf, stdin, '\n') == EOF)
 890                         goto free_specs;
 891                 if (!*buf->buf)
 892                         break;
 893         } while (1);
 894
 895         ret = push(nr_spec, specs);
 896         printf("\n");
 897         fflush(stdout);
 898
 899         if (ret)
 900                 exit(128); /* error already reported */
 901
 902  free_specs:
 903         for (i = 0; i < nr_spec; i++)
 904                 free(specs[i]);
 905         free(specs);
 906 }
 907
 908 int main(int argc, const char **argv)
 909 {
 910         struct strbuf buf = STRBUF_INIT;
 911         int nongit;
 912
 913         git_extract_argv0_path(argv[0]);
 914         setup_git_directory_gently(&nongit);
 915         if (argc < 2) {
 916                 fprintf(stderr, "Remote needed\n");
 917                 return 1;
 918         }
 919
 920         options.verbosity = 1;
 921         options.progress = !!isatty(2);
 922         options.thin = 1;
 923
 924         remote = remote_get(argv[1]);
 925
 926         if (argc > 2) {
 927                 end_url_with_slash(&url, argv[2]);
 928         } else {
 929                 end_url_with_slash(&url, remote->url[0]);
 930         }
 931
 932         http_init(remote, url.buf, 0);
 933
 934         do {
 935                 if (strbuf_getline(&buf, stdin, '\n') == EOF) {
 936                         if (ferror(stdin))
 937                                 fprintf(stderr, "Error reading command stream\n");
 938                         else
 939                                 fprintf(stderr, "Unexpected end of command stream\n");
 940                         return 1;
 941                 }
 942                 if (buf.len == 0)
 943                         break;
 944                 if (!prefixcmp(buf.buf, "fetch ")) {
 945                         if (nongit)
 946                                 die("Fetch attempted without a local repo");
 947                         parse_fetch(&buf);
 948
 949                 } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
 950                         int for_push = !!strstr(buf.buf + 4, "for-push");
 951                         output_refs(get_refs(for_push));
 952
 953                 } else if (!prefixcmp(buf.buf, "push ")) {
 954                         parse_push(&buf);
 955
 956                 } else if (!prefixcmp(buf.buf, "option ")) {
 957                         char *name = buf.buf + strlen("option ");
 958                         char *value = strchr(name, ' ');
 959                         int result;
 960
 961                         if (value)
 962                                 *value++ = '\0';
 963                         else
 964                                 value = "true";
 965
 966                         result = set_option(name, value);
 967                         if (!result)
 968                                 printf("ok\n");
 969                         else if (result < 0)
 970                                 printf("error invalid value\n");
 971                         else
 972                                 printf("unsupported\n");
 973                         fflush(stdout);
 974
 975                 } else if (!strcmp(buf.buf, "capabilities")) {
 976                         printf("fetch\n");
 977                         printf("option\n");
 978                         printf("push\n");
 979                         printf("check-connectivity\n");
 980                         printf("\n");
 981                         fflush(stdout);
 982                 } else {
 983                         fprintf(stderr, "Unknown command '%s'\n", buf.buf);
 984                         return 1;
 985                 }
 986                 strbuf_reset(&buf);
 987         } while (1);
 988
 989         http_cleanup();
 990
 991         return 0;
 992 }