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 #include "sha1-array.h"
  14
  15 static struct remote *remote;
  16 /* always ends with a trailing slash */
  17 static struct strbuf url = STRBUF_INIT;
  18
  19 struct options {
  20         int verbosity;
  21         unsigned long depth;
  22         unsigned progress : 1,
  23                 check_self_contained_and_connected : 1,
  24                 cloning : 1,
  25                 update_shallow : 1,
  26                 followtags : 1,
  27                 dry_run : 1,
  28                 thin : 1;
  29 };
  30 static struct options options;
  31 static struct string_list cas_options = STRING_LIST_INIT_DUP;
  32
  33 static int set_option(const char *name, const char *value)
  34 {
  35         if (!strcmp(name, "verbosity")) {
  36                 char *end;
  37                 int v = strtol(value, &end, 10);
  38                 if (value == end || *end)
  39                         return -1;
  40                 options.verbosity = v;
  41                 return 0;
  42         }
  43         else if (!strcmp(name, "progress")) {
  44                 if (!strcmp(value, "true"))
  45                         options.progress = 1;
  46                 else if (!strcmp(value, "false"))
  47                         options.progress = 0;
  48                 else
  49                         return -1;
  50                 return 0;
  51         }
  52         else if (!strcmp(name, "depth")) {
  53                 char *end;
  54                 unsigned long v = strtoul(value, &end, 10);
  55                 if (value == end || *end)
  56                         return -1;
  57                 options.depth = v;
  58                 return 0;
  59         }
  60         else if (!strcmp(name, "followtags")) {
  61                 if (!strcmp(value, "true"))
  62                         options.followtags = 1;
  63                 else if (!strcmp(value, "false"))
  64                         options.followtags = 0;
  65                 else
  66                         return -1;
  67                 return 0;
  68         }
  69         else if (!strcmp(name, "dry-run")) {
  70                 if (!strcmp(value, "true"))
  71                         options.dry_run = 1;
  72                 else if (!strcmp(value, "false"))
  73                         options.dry_run = 0;
  74                 else
  75                         return -1;
  76                 return 0;
  77         }
  78         else if (!strcmp(name, "check-connectivity")) {
  79                 if (!strcmp(value, "true"))
  80                         options.check_self_contained_and_connected = 1;
  81                 else if (!strcmp(value, "false"))
  82                         options.check_self_contained_and_connected = 0;
  83                 else
  84                         return -1;
  85                 return 0;
  86         }
  87         else if (!strcmp(name, "cas")) {
  88                 struct strbuf val = STRBUF_INIT;
  89                 strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
  90                 string_list_append(&cas_options, val.buf);
  91                 strbuf_release(&val);
  92                 return 0;
  93         } else if (!strcmp(name, "cloning")) {
  94                 if (!strcmp(value, "true"))
  95                         options.cloning = 1;
  96                 else if (!strcmp(value, "false"))
  97                         options.cloning = 0;
  98                 else
  99                         return -1;
 100                 return 0;
 101         } else if (!strcmp(name, "update-shallow")) {
 102                 if (!strcmp(value, "true"))
 103                         options.update_shallow = 1;
 104                 else if (!strcmp(value, "false"))
 105                         options.update_shallow = 0;
 106                 else
 107                         return -1;
 108                 return 0;
 109         } else {
 110                 return 1 /* unsupported */;
 111         }
 112 }
 113
 114 struct discovery {
 115         const char *service;
 116         char *buf_alloc;
 117         char *buf;
 118         size_t len;
 119         struct ref *refs;
 120         struct sha1_array shallow;
 121         unsigned proto_git : 1;
 122 };
 123 static struct discovery *last_discovery;
 124
 125 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 126 {
 127         struct ref *list = NULL;
 128         get_remote_heads(-1, heads->buf, heads->len, &list,
 129                          for_push ? REF_NORMAL : 0, NULL, &heads->shallow);
 130         return list;
 131 }
 132
 133 static struct ref *parse_info_refs(struct discovery *heads)
 134 {
 135         char *data, *start, *mid;
 136         char *ref_name;
 137         int i = 0;
 138
 139         struct ref *refs = NULL;
 140         struct ref *ref = NULL;
 141         struct ref *last_ref = NULL;
 142
 143         data = heads->buf;
 144         start = NULL;
 145         mid = data;
 146         while (i < heads->len) {
 147                 if (!start) {
 148                         start = &data[i];
 149                 }
 150                 if (data[i] == '\t')
 151                         mid = &data[i];
 152                 if (data[i] == '\n') {
 153                         if (mid - start != 40)
 154                                 die("%sinfo/refs not valid: is this a git repository?",
 155                                     url.buf);
 156                         data[i] = 0;
 157                         ref_name = mid + 1;
 158                         ref = xmalloc(sizeof(struct ref) +
 159                                       strlen(ref_name) + 1);
 160                         memset(ref, 0, sizeof(struct ref));
 161                         strcpy(ref->name, ref_name);
 162                         get_sha1_hex(start, ref->old_sha1);
 163                         if (!refs)
 164                                 refs = ref;
 165                         if (last_ref)
 166                                 last_ref->next = ref;
 167                         last_ref = ref;
 168                         start = NULL;
 169                 }
 170                 i++;
 171         }
 172
 173         ref = alloc_ref("HEAD");
 174         if (!http_fetch_ref(url.buf, ref) &&
 175             !resolve_remote_symref(ref, refs)) {
 176                 ref->next = refs;
 177                 refs = ref;
 178         } else {
 179                 free(ref);
 180         }
 181
 182         return refs;
 183 }
 184
 185 static void free_discovery(struct discovery *d)
 186 {
 187         if (d) {
 188                 if (d == last_discovery)
 189                         last_discovery = NULL;
 190                 free(d->shallow.sha1);
 191                 free(d->buf_alloc);
 192                 free_refs(d->refs);
 193                 free(d);
 194         }
 195 }
 196
 197 static int show_http_message(struct strbuf *type, struct strbuf *msg)
 198 {
 199         const char *p, *eol;
 200
 201         /*
 202          * We only show text/plain parts, as other types are likely
 203          * to be ugly to look at on the user's terminal.
 204          *
 205          * TODO should handle "; charset=XXX", and re-encode into
 206          * logoutputencoding
 207          */
 208         if (strcasecmp(type->buf, "text/plain"))
 209                 return -1;
 210
 211         strbuf_trim(msg);
 212         if (!msg->len)
 213                 return -1;
 214
 215         p = msg->buf;
 216         do {
 217                 eol = strchrnul(p, '\n');
 218                 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 219                 p = eol + 1;
 220         } while(*eol);
 221         return 0;
 222 }
 223
 224 static struct discovery* discover_refs(const char *service, int for_push)
 225 {
 226         struct strbuf exp = STRBUF_INIT;
 227         struct strbuf type = STRBUF_INIT;
 228         struct strbuf buffer = STRBUF_INIT;
 229         struct strbuf refs_url = STRBUF_INIT;
 230         struct strbuf effective_url = STRBUF_INIT;
 231         struct discovery *last = last_discovery;
 232         int http_ret, maybe_smart = 0;
 233         struct http_get_options options;
 234
 235         if (last && !strcmp(service, last->service))
 236                 return last;
 237         free_discovery(last);
 238
 239         strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 240         if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 241              git_env_bool("GIT_SMART_HTTP", 1)) {
 242                 maybe_smart = 1;
 243                 if (!strchr(url.buf, '?'))
 244                         strbuf_addch(&refs_url, '?');
 245                 else
 246                         strbuf_addch(&refs_url, '&');
 247                 strbuf_addf(&refs_url, "service=%s", service);
 248         }
 249
 250         memset(&options, 0, sizeof(options));
 251         options.content_type = &type;
 252         options.effective_url = &effective_url;
 253         options.base_url = &url;
 254         options.no_cache = 1;
 255         options.keep_error = 1;
 256
 257         http_ret = http_get_strbuf(refs_url.buf, &buffer, &options);
 258         switch (http_ret) {
 259         case HTTP_OK:
 260                 break;
 261         case HTTP_MISSING_TARGET:
 262                 show_http_message(&type, &buffer);
 263                 die("repository '%s' not found", url.buf);
 264         case HTTP_NOAUTH:
 265                 show_http_message(&type, &buffer);
 266                 die("Authentication failed for '%s'", url.buf);
 267         default:
 268                 show_http_message(&type, &buffer);
 269                 die("unable to access '%s': %s", url.buf, curl_errorstr);
 270         }
 271
 272         last= xcalloc(1, sizeof(*last_discovery));
 273         last->service = service;
 274         last->buf_alloc = strbuf_detach(&buffer, &last->len);
 275         last->buf = last->buf_alloc;
 276
 277         strbuf_addf(&exp, "application/x-%s-advertisement", service);
 278         if (maybe_smart &&
 279             (5 <= last->len && last->buf[4] == '#') &&
 280             !strbuf_cmp(&exp, &type)) {
 281                 char *line;
 282
 283                 /*
 284                  * smart HTTP response; validate that the service
 285                  * pkt-line matches our request.
 286                  */
 287                 line = packet_read_line_buf(&last->buf, &last->len, NULL);
 288
 289                 strbuf_reset(&exp);
 290                 strbuf_addf(&exp, "# service=%s", service);
 291                 if (strcmp(line, exp.buf))
 292                         die("invalid server response; got '%s'", line);
 293                 strbuf_release(&exp);
 294
 295                 /* The header can include additional metadata lines, up
 296                  * until a packet flush marker.  Ignore these now, but
 297                  * in the future we might start to scan them.
 298                  */
 299                 while (packet_read_line_buf(&last->buf, &last->len, NULL))
 300                         ;
 301
 302                 last->proto_git = 1;
 303         }
 304
 305         if (last->proto_git)
 306                 last->refs = parse_git_refs(last, for_push);
 307         else
 308                 last->refs = parse_info_refs(last);
 309
 310         strbuf_release(&refs_url);
 311         strbuf_release(&exp);
 312         strbuf_release(&type);
 313         strbuf_release(&effective_url);
 314         strbuf_release(&buffer);
 315         last_discovery = last;
 316         return last;
 317 }
 318
 319 static struct ref *get_refs(int for_push)
 320 {
 321         struct discovery *heads;
 322
 323         if (for_push)
 324                 heads = discover_refs("git-receive-pack", for_push);
 325         else
 326                 heads = discover_refs("git-upload-pack", for_push);
 327
 328         return heads->refs;
 329 }
 330
 331 static void output_refs(struct ref *refs)
 332 {
 333         struct ref *posn;
 334         for (posn = refs; posn; posn = posn->next) {
 335                 if (posn->symref)
 336                         printf("@%s %s\n", posn->symref, posn->name);
 337                 else
 338                         printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 339         }
 340         printf("\n");
 341         fflush(stdout);
 342 }
 343
 344 struct rpc_state {
 345         const char *service_name;
 346         const char **argv;
 347         struct strbuf *stdin_preamble;
 348         char *service_url;
 349         char *hdr_content_type;
 350         char *hdr_accept;
 351         char *buf;
 352         size_t alloc;
 353         size_t len;
 354         size_t pos;
 355         int in;
 356         int out;
 357         struct strbuf result;
 358         unsigned gzip_request : 1;
 359         unsigned initial_buffer : 1;
 360 };
 361
 362 static size_t rpc_out(void *ptr, size_t eltsize,
 363                 size_t nmemb, void *buffer_)
 364 {
 365         size_t max = eltsize * nmemb;
 366         struct rpc_state *rpc = buffer_;
 367         size_t avail = rpc->len - rpc->pos;
 368
 369         if (!avail) {
 370                 rpc->initial_buffer = 0;
 371                 avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 372                 if (!avail)
 373                         return 0;
 374                 rpc->pos = 0;
 375                 rpc->len = avail;
 376         }
 377
 378         if (max < avail)
 379                 avail = max;
 380         memcpy(ptr, rpc->buf + rpc->pos, avail);
 381         rpc->pos += avail;
 382         return avail;
 383 }
 384
 385 #ifndef NO_CURL_IOCTL
 386 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 387 {
 388         struct rpc_state *rpc = clientp;
 389
 390         switch (cmd) {
 391         case CURLIOCMD_NOP:
 392                 return CURLIOE_OK;
 393
 394         case CURLIOCMD_RESTARTREAD:
 395                 if (rpc->initial_buffer) {
 396                         rpc->pos = 0;
 397                         return CURLIOE_OK;
 398                 }
 399                 fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
 400                 return CURLIOE_FAILRESTART;
 401
 402         default:
 403                 return CURLIOE_UNKNOWNCMD;
 404         }
 405 }
 406 #endif
 407
 408 static size_t rpc_in(char *ptr, size_t eltsize,
 409                 size_t nmemb, void *buffer_)
 410 {
 411         size_t size = eltsize * nmemb;
 412         struct rpc_state *rpc = buffer_;
 413         write_or_die(rpc->in, ptr, size);
 414         return size;
 415 }
 416
 417 static int run_slot(struct active_request_slot *slot,
 418                     struct slot_results *results)
 419 {
 420         int err;
 421         struct slot_results results_buf;
 422
 423         if (!results)
 424                 results = &results_buf;
 425
 426         err = run_one_slot(slot, results);
 427
 428         if (err != HTTP_OK && err != HTTP_REAUTH) {
 429                 error("RPC failed; result=%d, HTTP code = %ld",
 430                       results->curl_result, results->http_code);
 431         }
 432
 433         return err;
 434 }
 435
 436 static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 437 {
 438         struct active_request_slot *slot;
 439         struct curl_slist *headers = NULL;
 440         struct strbuf buf = STRBUF_INIT;
 441         int err;
 442
 443         slot = get_active_slot();
 444
 445         headers = curl_slist_append(headers, rpc->hdr_content_type);
 446         headers = curl_slist_append(headers, rpc->hdr_accept);
 447
 448         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 449         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 450         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 451         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 452         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 453         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 454         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 455         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 456         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 457
 458         err = run_slot(slot, results);
 459
 460         curl_slist_free_all(headers);
 461         strbuf_release(&buf);
 462         return err;
 463 }
 464
 465 static int post_rpc(struct rpc_state *rpc)
 466 {
 467         struct active_request_slot *slot;
 468         struct curl_slist *headers = NULL;
 469         int use_gzip = rpc->gzip_request;
 470         char *gzip_body = NULL;
 471         size_t gzip_size = 0;
 472         int err, large_request = 0;
 473         int needs_100_continue = 0;
 474
 475         /* Try to load the entire request, if we can fit it into the
 476          * allocated buffer space we can use HTTP/1.0 and avoid the
 477          * chunked encoding mess.
 478          */
 479         while (1) {
 480                 size_t left = rpc->alloc - rpc->len;
 481                 char *buf = rpc->buf + rpc->len;
 482                 int n;
 483
 484                 if (left < LARGE_PACKET_MAX) {
 485                         large_request = 1;
 486                         use_gzip = 0;
 487                         break;
 488                 }
 489
 490                 n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 491                 if (!n)
 492                         break;
 493                 rpc->len += n;
 494         }
 495
 496         if (large_request) {
 497                 struct slot_results results;
 498
 499                 do {
 500                         err = probe_rpc(rpc, &results);
 501                         if (err == HTTP_REAUTH)
 502                                 credential_fill(&http_auth);
 503                 } while (err == HTTP_REAUTH);
 504                 if (err != HTTP_OK)
 505                         return -1;
 506
 507                 if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 508                         needs_100_continue = 1;
 509         }
 510
 511         headers = curl_slist_append(headers, rpc->hdr_content_type);
 512         headers = curl_slist_append(headers, rpc->hdr_accept);
 513         headers = curl_slist_append(headers, needs_100_continue ?
 514                 "Expect: 100-continue" : "Expect:");
 515
 516 retry:
 517         slot = get_active_slot();
 518
 519         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 520         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 521         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 522         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 523
 524         if (large_request) {
 525                 /* The request body is large and the size cannot be predicted.
 526                  * We must use chunked encoding to send it.
 527                  */
 528                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 529                 rpc->initial_buffer = 1;
 530                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 531                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 532 #ifndef NO_CURL_IOCTL
 533                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 534                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 535 #endif
 536                 if (options.verbosity > 1) {
 537                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 538                         fflush(stderr);
 539                 }
 540
 541         } else if (gzip_body) {
 542                 /*
 543                  * If we are looping to retry authentication, then the previous
 544                  * run will have set up the headers and gzip buffer already,
 545                  * and we just need to send it.
 546                  */
 547                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 548                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 549
 550         } else if (use_gzip && 1024 < rpc->len) {
 551                 /* The client backend isn't giving us compressed data so
 552                  * we can try to deflate it ourselves, this may save on.
 553                  * the transfer time.
 554                  */
 555                 git_zstream stream;
 556                 int ret;
 557
 558                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 559                 gzip_size = git_deflate_bound(&stream, rpc->len);
 560                 gzip_body = xmalloc(gzip_size);
 561
 562                 stream.next_in = (unsigned char *)rpc->buf;
 563                 stream.avail_in = rpc->len;
 564                 stream.next_out = (unsigned char *)gzip_body;
 565                 stream.avail_out = gzip_size;
 566
 567                 ret = git_deflate(&stream, Z_FINISH);
 568                 if (ret != Z_STREAM_END)
 569                         die("cannot deflate request; zlib deflate error %d", ret);
 570
 571                 ret = git_deflate_end_gently(&stream);
 572                 if (ret != Z_OK)
 573                         die("cannot deflate request; zlib end error %d", ret);
 574
 575                 gzip_size = stream.total_out;
 576
 577                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 578                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 579                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 580
 581                 if (options.verbosity > 1) {
 582                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 583                                 rpc->service_name,
 584                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
 585                         fflush(stderr);
 586                 }
 587         } else {
 588                 /* We know the complete request size in advance, use the
 589                  * more normal Content-Length approach.
 590                  */
 591                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 592                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 593                 if (options.verbosity > 1) {
 594                         fprintf(stderr, "POST %s (%lu bytes)\n",
 595                                 rpc->service_name, (unsigned long)rpc->len);
 596                         fflush(stderr);
 597                 }
 598         }
 599
 600         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 601         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 602         curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 603
 604         err = run_slot(slot, NULL);
 605         if (err == HTTP_REAUTH && !large_request) {
 606                 credential_fill(&http_auth);
 607                 goto retry;
 608         }
 609         if (err != HTTP_OK)
 610                 err = -1;
 611
 612         curl_slist_free_all(headers);
 613         free(gzip_body);
 614         return err;
 615 }
 616
 617 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 618 {
 619         const char *svc = rpc->service_name;
 620         struct strbuf buf = STRBUF_INIT;
 621         struct strbuf *preamble = rpc->stdin_preamble;
 622         struct child_process client;
 623         int err = 0;
 624
 625         memset(&client, 0, sizeof(client));
 626         client.in = -1;
 627         client.out = -1;
 628         client.git_cmd = 1;
 629         client.argv = rpc->argv;
 630         if (start_command(&client))
 631                 exit(1);
 632         if (preamble)
 633                 write_or_die(client.in, preamble->buf, preamble->len);
 634         if (heads)
 635                 write_or_die(client.in, heads->buf, heads->len);
 636
 637         rpc->alloc = http_post_buffer;
 638         rpc->buf = xmalloc(rpc->alloc);
 639         rpc->in = client.in;
 640         rpc->out = client.out;
 641         strbuf_init(&rpc->result, 0);
 642
 643         strbuf_addf(&buf, "%s%s", url.buf, svc);
 644         rpc->service_url = strbuf_detach(&buf, NULL);
 645
 646         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 647         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 648
 649         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 650         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 651
 652         while (!err) {
 653                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 654                 if (!n)
 655                         break;
 656                 rpc->pos = 0;
 657                 rpc->len = n;
 658                 err |= post_rpc(rpc);
 659         }
 660
 661         close(client.in);
 662         client.in = -1;
 663         if (!err) {
 664                 strbuf_read(&rpc->result, client.out, 0);
 665         } else {
 666                 char buf[4096];
 667                 for (;;)
 668                         if (xread(client.out, buf, sizeof(buf)) <= 0)
 669                                 break;
 670         }
 671
 672         close(client.out);
 673         client.out = -1;
 674
 675         err |= finish_command(&client);
 676         free(rpc->service_url);
 677         free(rpc->hdr_content_type);
 678         free(rpc->hdr_accept);
 679         free(rpc->buf);
 680         strbuf_release(&buf);
 681         return err;
 682 }
 683
 684 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 685 {
 686         struct walker *walker;
 687         char **targets = xmalloc(nr_heads * sizeof(char*));
 688         int ret, i;
 689
 690         if (options.depth)
 691                 die("dumb http transport does not support --depth");
 692         for (i = 0; i < nr_heads; i++)
 693                 targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 694
 695         walker = get_http_walker(url.buf);
 696         walker->get_all = 1;
 697         walker->get_tree = 1;
 698         walker->get_history = 1;
 699         walker->get_verbosely = options.verbosity >= 3;
 700         walker->get_recover = 0;
 701         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 702         walker_free(walker);
 703
 704         for (i = 0; i < nr_heads; i++)
 705                 free(targets[i]);
 706         free(targets);
 707
 708         return ret ? error("Fetch failed.") : 0;
 709 }
 710
 711 static int fetch_git(struct discovery *heads,
 712         int nr_heads, struct ref **to_fetch)
 713 {
 714         struct rpc_state rpc;
 715         struct strbuf preamble = STRBUF_INIT;
 716         char *depth_arg = NULL;
 717         int argc = 0, i, err;
 718         const char *argv[17];
 719
 720         argv[argc++] = "fetch-pack";
 721         argv[argc++] = "--stateless-rpc";
 722         argv[argc++] = "--stdin";
 723         argv[argc++] = "--lock-pack";
 724         if (options.followtags)
 725                 argv[argc++] = "--include-tag";
 726         if (options.thin)
 727                 argv[argc++] = "--thin";
 728         if (options.verbosity >= 3) {
 729                 argv[argc++] = "-v";
 730                 argv[argc++] = "-v";
 731         }
 732         if (options.check_self_contained_and_connected)
 733                 argv[argc++] = "--check-self-contained-and-connected";
 734         if (options.cloning)
 735                 argv[argc++] = "--cloning";
 736         if (options.update_shallow)
 737                 argv[argc++] = "--update-shallow";
 738         if (!options.progress)
 739                 argv[argc++] = "--no-progress";
 740         if (options.depth) {
 741                 struct strbuf buf = STRBUF_INIT;
 742                 strbuf_addf(&buf, "--depth=%lu", options.depth);
 743                 depth_arg = strbuf_detach(&buf, NULL);
 744                 argv[argc++] = depth_arg;
 745         }
 746         argv[argc++] = url.buf;
 747         argv[argc++] = NULL;
 748
 749         for (i = 0; i < nr_heads; i++) {
 750                 struct ref *ref = to_fetch[i];
 751                 if (!ref->name || !*ref->name)
 752                         die("cannot fetch by sha1 over smart http");
 753                 packet_buf_write(&preamble, "%s %s\n",
 754                                  sha1_to_hex(ref->old_sha1), ref->name);
 755         }
 756         packet_buf_flush(&preamble);
 757
 758         memset(&rpc, 0, sizeof(rpc));
 759         rpc.service_name = "git-upload-pack",
 760         rpc.argv = argv;
 761         rpc.stdin_preamble = &preamble;
 762         rpc.gzip_request = 1;
 763
 764         err = rpc_service(&rpc, heads);
 765         if (rpc.result.len)
 766                 write_or_die(1, rpc.result.buf, rpc.result.len);
 767         strbuf_release(&rpc.result);
 768         strbuf_release(&preamble);
 769         free(depth_arg);
 770         return err;
 771 }
 772
 773 static int fetch(int nr_heads, struct ref **to_fetch)
 774 {
 775         struct discovery *d = discover_refs("git-upload-pack", 0);
 776         if (d->proto_git)
 777                 return fetch_git(d, nr_heads, to_fetch);
 778         else
 779                 return fetch_dumb(nr_heads, to_fetch);
 780 }
 781
 782 static void parse_fetch(struct strbuf *buf)
 783 {
 784         struct ref **to_fetch = NULL;
 785         struct ref *list_head = NULL;
 786         struct ref **list = &list_head;
 787         int alloc_heads = 0, nr_heads = 0;
 788
 789         do {
 790                 if (starts_with(buf->buf, "fetch ")) {
 791                         char *p = buf->buf + strlen("fetch ");
 792                         char *name;
 793                         struct ref *ref;
 794                         unsigned char old_sha1[20];
 795
 796                         if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 797                                 die("protocol error: expected sha/ref, got %s'", p);
 798                         if (p[40] == ' ')
 799                                 name = p + 41;
 800                         else if (!p[40])
 801                                 name = "";
 802                         else
 803                                 die("protocol error: expected sha/ref, got %s'", p);
 804
 805                         ref = alloc_ref(name);
 806                         hashcpy(ref->old_sha1, old_sha1);
 807
 808                         *list = ref;
 809                         list = &ref->next;
 810
 811                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 812                         to_fetch[nr_heads++] = ref;
 813                 }
 814                 else
 815                         die("http transport does not support %s", buf->buf);
 816
 817                 strbuf_reset(buf);
 818                 if (strbuf_getline(buf, stdin, '\n') == EOF)
 819                         return;
 820                 if (!*buf->buf)
 821                         break;
 822         } while (1);
 823
 824         if (fetch(nr_heads, to_fetch))
 825                 exit(128); /* error already reported */
 826         free_refs(list_head);
 827         free(to_fetch);
 828
 829         printf("\n");
 830         fflush(stdout);
 831         strbuf_reset(buf);
 832 }
 833
 834 static int push_dav(int nr_spec, char **specs)
 835 {
 836         const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 837         int argc = 0, i;
 838
 839         argv[argc++] = "http-push";
 840         argv[argc++] = "--helper-status";
 841         if (options.dry_run)
 842                 argv[argc++] = "--dry-run";
 843         if (options.verbosity > 1)
 844                 argv[argc++] = "--verbose";
 845         argv[argc++] = url.buf;
 846         for (i = 0; i < nr_spec; i++)
 847                 argv[argc++] = specs[i];
 848         argv[argc++] = NULL;
 849
 850         if (run_command_v_opt(argv, RUN_GIT_CMD))
 851                 die("git-%s failed", argv[0]);
 852         free(argv);
 853         return 0;
 854 }
 855
 856 static int push_git(struct discovery *heads, int nr_spec, char **specs)
 857 {
 858         struct rpc_state rpc;
 859         int i, err;
 860         struct argv_array args;
 861         struct string_list_item *cas_option;
 862
 863         argv_array_init(&args);
 864         argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 865                          NULL);
 866
 867         if (options.thin)
 868                 argv_array_push(&args, "--thin");
 869         if (options.dry_run)
 870                 argv_array_push(&args, "--dry-run");
 871         if (options.verbosity == 0)
 872                 argv_array_push(&args, "--quiet");
 873         else if (options.verbosity > 1)
 874                 argv_array_push(&args, "--verbose");
 875         argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 876         for_each_string_list_item(cas_option, &cas_options)
 877                 argv_array_push(&args, cas_option->string);
 878         argv_array_push(&args, url.buf);
 879         for (i = 0; i < nr_spec; i++)
 880                 argv_array_push(&args, specs[i]);
 881
 882         memset(&rpc, 0, sizeof(rpc));
 883         rpc.service_name = "git-receive-pack",
 884         rpc.argv = args.argv;
 885
 886         err = rpc_service(&rpc, heads);
 887         if (rpc.result.len)
 888                 write_or_die(1, rpc.result.buf, rpc.result.len);
 889         strbuf_release(&rpc.result);
 890         argv_array_clear(&args);
 891         return err;
 892 }
 893
 894 static int push(int nr_spec, char **specs)
 895 {
 896         struct discovery *heads = discover_refs("git-receive-pack", 1);
 897         int ret;
 898
 899         if (heads->proto_git)
 900                 ret = push_git(heads, nr_spec, specs);
 901         else
 902                 ret = push_dav(nr_spec, specs);
 903         free_discovery(heads);
 904         return ret;
 905 }
 906
 907 static void parse_push(struct strbuf *buf)
 908 {
 909         char **specs = NULL;
 910         int alloc_spec = 0, nr_spec = 0, i, ret;
 911
 912         do {
 913                 if (starts_with(buf->buf, "push ")) {
 914                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 915                         specs[nr_spec++] = xstrdup(buf->buf + 5);
 916                 }
 917                 else
 918                         die("http transport does not support %s", buf->buf);
 919
 920                 strbuf_reset(buf);
 921                 if (strbuf_getline(buf, stdin, '\n') == EOF)
 922                         goto free_specs;
 923                 if (!*buf->buf)
 924                         break;
 925         } while (1);
 926
 927         ret = push(nr_spec, specs);
 928         printf("\n");
 929         fflush(stdout);
 930
 931         if (ret)
 932                 exit(128); /* error already reported */
 933
 934  free_specs:
 935         for (i = 0; i < nr_spec; i++)
 936                 free(specs[i]);
 937         free(specs);
 938 }
 939
 940 int main(int argc, const char **argv)
 941 {
 942         struct strbuf buf = STRBUF_INIT;
 943         int nongit;
 944
 945         git_extract_argv0_path(argv[0]);
 946         setup_git_directory_gently(&nongit);
 947         if (argc < 2) {
 948                 fprintf(stderr, "Remote needed\n");
 949                 return 1;
 950         }
 951
 952         options.verbosity = 1;
 953         options.progress = !!isatty(2);
 954         options.thin = 1;
 955
 956         remote = remote_get(argv[1]);
 957
 958         if (argc > 2) {
 959                 end_url_with_slash(&url, argv[2]);
 960         } else {
 961                 end_url_with_slash(&url, remote->url[0]);
 962         }
 963
 964         http_init(remote, url.buf, 0);
 965
 966         do {
 967                 if (strbuf_getline(&buf, stdin, '\n') == EOF) {
 968                         if (ferror(stdin))
 969                                 fprintf(stderr, "Error reading command stream\n");
 970                         else
 971                                 fprintf(stderr, "Unexpected end of command stream\n");
 972                         return 1;
 973                 }
 974                 if (buf.len == 0)
 975                         break;
 976                 if (starts_with(buf.buf, "fetch ")) {
 977                         if (nongit)
 978                                 die("Fetch attempted without a local repo");
 979                         parse_fetch(&buf);
 980
 981                 } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
 982                         int for_push = !!strstr(buf.buf + 4, "for-push");
 983                         output_refs(get_refs(for_push));
 984
 985                 } else if (starts_with(buf.buf, "push ")) {
 986                         parse_push(&buf);
 987
 988                 } else if (starts_with(buf.buf, "option ")) {
 989                         char *name = buf.buf + strlen("option ");
 990                         char *value = strchr(name, ' ');
 991                         int result;
 992
 993                         if (value)
 994                                 *value++ = '\0';
 995                         else
 996                                 value = "true";
 997
 998                         result = set_option(name, value);
 999                         if (!result)
1000                                 printf("ok\n");
1001                         else if (result < 0)
1002                                 printf("error invalid value\n");
1003                         else
1004                                 printf("unsupported\n");
1005                         fflush(stdout);
1006
1007                 } else if (!strcmp(buf.buf, "capabilities")) {
1008                         printf("fetch\n");
1009                         printf("option\n");
1010                         printf("push\n");
1011                         printf("check-connectivity\n");
1012                         printf("\n");
1013                         fflush(stdout);
1014                 } else {
1015                         fprintf(stderr, "Unknown command '%s'\n", buf.buf);
1016                         return 1;
1017                 }
1018                 strbuf_reset(&buf);
1019         } while (1);
1020
1021         http_cleanup();
1022
1023         return 0;
1024 }