git.oblomov.eu Git - git/blob - 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 #include "send-pack.h"
  15
  16 static struct remote *remote;
  17 /* always ends with a trailing slash */
  18 static struct strbuf url = STRBUF_INIT;
  19
  20 struct options {
  21         int verbosity;
  22         unsigned long depth;
  23         char *deepen_since;
  24         struct string_list deepen_not;
  25         unsigned progress : 1,
  26                 check_self_contained_and_connected : 1,
  27                 cloning : 1,
  28                 update_shallow : 1,
  29                 followtags : 1,
  30                 dry_run : 1,
  31                 thin : 1,
  32                 /* One of the SEND_PACK_PUSH_CERT_* constants. */
  33                 push_cert : 2;
  34 };
  35 static struct options options;
  36 static struct string_list cas_options = STRING_LIST_INIT_DUP;
  37
  38 static int set_option(const char *name, const char *value)
  39 {
  40         if (!strcmp(name, "verbosity")) {
  41                 char *end;
  42                 int v = strtol(value, &end, 10);
  43                 if (value == end || *end)
  44                         return -1;
  45                 options.verbosity = v;
  46                 return 0;
  47         }
  48         else if (!strcmp(name, "progress")) {
  49                 if (!strcmp(value, "true"))
  50                         options.progress = 1;
  51                 else if (!strcmp(value, "false"))
  52                         options.progress = 0;
  53                 else
  54                         return -1;
  55                 return 0;
  56         }
  57         else if (!strcmp(name, "depth")) {
  58                 char *end;
  59                 unsigned long v = strtoul(value, &end, 10);
  60                 if (value == end || *end)
  61                         return -1;
  62                 options.depth = v;
  63                 return 0;
  64         }
  65         else if (!strcmp(name, "deepen-since")) {
  66                 options.deepen_since = xstrdup(value);
  67                 return 0;
  68         }
  69         else if (!strcmp(name, "deepen-not")) {
  70                 string_list_append(&options.deepen_not, value);
  71                 return 0;
  72         }
  73         else if (!strcmp(name, "followtags")) {
  74                 if (!strcmp(value, "true"))
  75                         options.followtags = 1;
  76                 else if (!strcmp(value, "false"))
  77                         options.followtags = 0;
  78                 else
  79                         return -1;
  80                 return 0;
  81         }
  82         else if (!strcmp(name, "dry-run")) {
  83                 if (!strcmp(value, "true"))
  84                         options.dry_run = 1;
  85                 else if (!strcmp(value, "false"))
  86                         options.dry_run = 0;
  87                 else
  88                         return -1;
  89                 return 0;
  90         }
  91         else if (!strcmp(name, "check-connectivity")) {
  92                 if (!strcmp(value, "true"))
  93                         options.check_self_contained_and_connected = 1;
  94                 else if (!strcmp(value, "false"))
  95                         options.check_self_contained_and_connected = 0;
  96                 else
  97                         return -1;
  98                 return 0;
  99         }
 100         else if (!strcmp(name, "cas")) {
 101                 struct strbuf val = STRBUF_INIT;
 102                 strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
 103                 string_list_append(&cas_options, val.buf);
 104                 strbuf_release(&val);
 105                 return 0;
 106         } else if (!strcmp(name, "cloning")) {
 107                 if (!strcmp(value, "true"))
 108                         options.cloning = 1;
 109                 else if (!strcmp(value, "false"))
 110                         options.cloning = 0;
 111                 else
 112                         return -1;
 113                 return 0;
 114         } else if (!strcmp(name, "update-shallow")) {
 115                 if (!strcmp(value, "true"))
 116                         options.update_shallow = 1;
 117                 else if (!strcmp(value, "false"))
 118                         options.update_shallow = 0;
 119                 else
 120                         return -1;
 121                 return 0;
 122         } else if (!strcmp(name, "pushcert")) {
 123                 if (!strcmp(value, "true"))
 124                         options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 125                 else if (!strcmp(value, "false"))
 126                         options.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 127                 else if (!strcmp(value, "if-asked"))
 128                         options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 129                 else
 130                         return -1;
 131                 return 0;
 132         } else {
 133                 return 1 /* unsupported */;
 134         }
 135 }
 136
 137 struct discovery {
 138         const char *service;
 139         char *buf_alloc;
 140         char *buf;
 141         size_t len;
 142         struct ref *refs;
 143         struct sha1_array shallow;
 144         unsigned proto_git : 1;
 145 };
 146 static struct discovery *last_discovery;
 147
 148 static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 149 {
 150         struct ref *list = NULL;
 151         get_remote_heads(-1, heads->buf, heads->len, &list,
 152                          for_push ? REF_NORMAL : 0, NULL, &heads->shallow);
 153         return list;
 154 }
 155
 156 static struct ref *parse_info_refs(struct discovery *heads)
 157 {
 158         char *data, *start, *mid;
 159         char *ref_name;
 160         int i = 0;
 161
 162         struct ref *refs = NULL;
 163         struct ref *ref = NULL;
 164         struct ref *last_ref = NULL;
 165
 166         data = heads->buf;
 167         start = NULL;
 168         mid = data;
 169         while (i < heads->len) {
 170                 if (!start) {
 171                         start = &data[i];
 172                 }
 173                 if (data[i] == '\t')
 174                         mid = &data[i];
 175                 if (data[i] == '\n') {
 176                         if (mid - start != 40)
 177                                 die("%sinfo/refs not valid: is this a git repository?",
 178                                     url.buf);
 179                         data[i] = 0;
 180                         ref_name = mid + 1;
 181                         ref = alloc_ref(ref_name);
 182                         get_oid_hex(start, &ref->old_oid);
 183                         if (!refs)
 184                                 refs = ref;
 185                         if (last_ref)
 186                                 last_ref->next = ref;
 187                         last_ref = ref;
 188                         start = NULL;
 189                 }
 190                 i++;
 191         }
 192
 193         ref = alloc_ref("HEAD");
 194         if (!http_fetch_ref(url.buf, ref) &&
 195             !resolve_remote_symref(ref, refs)) {
 196                 ref->next = refs;
 197                 refs = ref;
 198         } else {
 199                 free(ref);
 200         }
 201
 202         return refs;
 203 }
 204
 205 static void free_discovery(struct discovery *d)
 206 {
 207         if (d) {
 208                 if (d == last_discovery)
 209                         last_discovery = NULL;
 210                 free(d->shallow.sha1);
 211                 free(d->buf_alloc);
 212                 free_refs(d->refs);
 213                 free(d);
 214         }
 215 }
 216
 217 static int show_http_message(struct strbuf *type, struct strbuf *charset,
 218                              struct strbuf *msg)
 219 {
 220         const char *p, *eol;
 221
 222         /*
 223          * We only show text/plain parts, as other types are likely
 224          * to be ugly to look at on the user's terminal.
 225          */
 226         if (strcmp(type->buf, "text/plain"))
 227                 return -1;
 228         if (charset->len)
 229                 strbuf_reencode(msg, charset->buf, get_log_output_encoding());
 230
 231         strbuf_trim(msg);
 232         if (!msg->len)
 233                 return -1;
 234
 235         p = msg->buf;
 236         do {
 237                 eol = strchrnul(p, '\n');
 238                 fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 239                 p = eol + 1;
 240         } while(*eol);
 241         return 0;
 242 }
 243
 244 static struct discovery *discover_refs(const char *service, int for_push)
 245 {
 246         struct strbuf exp = STRBUF_INIT;
 247         struct strbuf type = STRBUF_INIT;
 248         struct strbuf charset = STRBUF_INIT;
 249         struct strbuf buffer = STRBUF_INIT;
 250         struct strbuf refs_url = STRBUF_INIT;
 251         struct strbuf effective_url = STRBUF_INIT;
 252         struct discovery *last = last_discovery;
 253         int http_ret, maybe_smart = 0;
 254         struct http_get_options options;
 255
 256         if (last && !strcmp(service, last->service))
 257                 return last;
 258         free_discovery(last);
 259
 260         strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 261         if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 262              git_env_bool("GIT_SMART_HTTP", 1)) {
 263                 maybe_smart = 1;
 264                 if (!strchr(url.buf, '?'))
 265                         strbuf_addch(&refs_url, '?');
 266                 else
 267                         strbuf_addch(&refs_url, '&');
 268                 strbuf_addf(&refs_url, "service=%s", service);
 269         }
 270
 271         memset(&options, 0, sizeof(options));
 272         options.content_type = &type;
 273         options.charset = &charset;
 274         options.effective_url = &effective_url;
 275         options.base_url = &url;
 276         options.no_cache = 1;
 277         options.keep_error = 1;
 278
 279         http_ret = http_get_strbuf(refs_url.buf, &buffer, &options);
 280         switch (http_ret) {
 281         case HTTP_OK:
 282                 break;
 283         case HTTP_MISSING_TARGET:
 284                 show_http_message(&type, &charset, &buffer);
 285                 die("repository '%s' not found", url.buf);
 286         case HTTP_NOAUTH:
 287                 show_http_message(&type, &charset, &buffer);
 288                 die("Authentication failed for '%s'", url.buf);
 289         default:
 290                 show_http_message(&type, &charset, &buffer);
 291                 die("unable to access '%s': %s", url.buf, curl_errorstr);
 292         }
 293
 294         last= xcalloc(1, sizeof(*last_discovery));
 295         last->service = service;
 296         last->buf_alloc = strbuf_detach(&buffer, &last->len);
 297         last->buf = last->buf_alloc;
 298
 299         strbuf_addf(&exp, "application/x-%s-advertisement", service);
 300         if (maybe_smart &&
 301             (5 <= last->len && last->buf[4] == '#') &&
 302             !strbuf_cmp(&exp, &type)) {
 303                 char *line;
 304
 305                 /*
 306                  * smart HTTP response; validate that the service
 307                  * pkt-line matches our request.
 308                  */
 309                 line = packet_read_line_buf(&last->buf, &last->len, NULL);
 310
 311                 strbuf_reset(&exp);
 312                 strbuf_addf(&exp, "# service=%s", service);
 313                 if (strcmp(line, exp.buf))
 314                         die("invalid server response; got '%s'", line);
 315                 strbuf_release(&exp);
 316
 317                 /* The header can include additional metadata lines, up
 318                  * until a packet flush marker.  Ignore these now, but
 319                  * in the future we might start to scan them.
 320                  */
 321                 while (packet_read_line_buf(&last->buf, &last->len, NULL))
 322                         ;
 323
 324                 last->proto_git = 1;
 325         }
 326
 327         if (last->proto_git)
 328                 last->refs = parse_git_refs(last, for_push);
 329         else
 330                 last->refs = parse_info_refs(last);
 331
 332         strbuf_release(&refs_url);
 333         strbuf_release(&exp);
 334         strbuf_release(&type);
 335         strbuf_release(&charset);
 336         strbuf_release(&effective_url);
 337         strbuf_release(&buffer);
 338         last_discovery = last;
 339         return last;
 340 }
 341
 342 static struct ref *get_refs(int for_push)
 343 {
 344         struct discovery *heads;
 345
 346         if (for_push)
 347                 heads = discover_refs("git-receive-pack", for_push);
 348         else
 349                 heads = discover_refs("git-upload-pack", for_push);
 350
 351         return heads->refs;
 352 }
 353
 354 static void output_refs(struct ref *refs)
 355 {
 356         struct ref *posn;
 357         for (posn = refs; posn; posn = posn->next) {
 358                 if (posn->symref)
 359                         printf("@%s %s\n", posn->symref, posn->name);
 360                 else
 361                         printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name);
 362         }
 363         printf("\n");
 364         fflush(stdout);
 365 }
 366
 367 struct rpc_state {
 368         const char *service_name;
 369         const char **argv;
 370         struct strbuf *stdin_preamble;
 371         char *service_url;
 372         char *hdr_content_type;
 373         char *hdr_accept;
 374         char *buf;
 375         size_t alloc;
 376         size_t len;
 377         size_t pos;
 378         int in;
 379         int out;
 380         struct strbuf result;
 381         unsigned gzip_request : 1;
 382         unsigned initial_buffer : 1;
 383 };
 384
 385 static size_t rpc_out(void *ptr, size_t eltsize,
 386                 size_t nmemb, void *buffer_)
 387 {
 388         size_t max = eltsize * nmemb;
 389         struct rpc_state *rpc = buffer_;
 390         size_t avail = rpc->len - rpc->pos;
 391
 392         if (!avail) {
 393                 rpc->initial_buffer = 0;
 394                 avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 395                 if (!avail)
 396                         return 0;
 397                 rpc->pos = 0;
 398                 rpc->len = avail;
 399         }
 400
 401         if (max < avail)
 402                 avail = max;
 403         memcpy(ptr, rpc->buf + rpc->pos, avail);
 404         rpc->pos += avail;
 405         return avail;
 406 }
 407
 408 #ifndef NO_CURL_IOCTL
 409 static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 410 {
 411         struct rpc_state *rpc = clientp;
 412
 413         switch (cmd) {
 414         case CURLIOCMD_NOP:
 415                 return CURLIOE_OK;
 416
 417         case CURLIOCMD_RESTARTREAD:
 418                 if (rpc->initial_buffer) {
 419                         rpc->pos = 0;
 420                         return CURLIOE_OK;
 421                 }
 422                 error("unable to rewind rpc post data - try increasing http.postBuffer");
 423                 return CURLIOE_FAILRESTART;
 424
 425         default:
 426                 return CURLIOE_UNKNOWNCMD;
 427         }
 428 }
 429 #endif
 430
 431 static size_t rpc_in(char *ptr, size_t eltsize,
 432                 size_t nmemb, void *buffer_)
 433 {
 434         size_t size = eltsize * nmemb;
 435         struct rpc_state *rpc = buffer_;
 436         write_or_die(rpc->in, ptr, size);
 437         return size;
 438 }
 439
 440 static int run_slot(struct active_request_slot *slot,
 441                     struct slot_results *results)
 442 {
 443         int err;
 444         struct slot_results results_buf;
 445
 446         if (!results)
 447                 results = &results_buf;
 448
 449         err = run_one_slot(slot, results);
 450
 451         if (err != HTTP_OK && err != HTTP_REAUTH) {
 452                 error("RPC failed; result=%d, HTTP code = %ld",
 453                       results->curl_result, results->http_code);
 454         }
 455
 456         return err;
 457 }
 458
 459 static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 460 {
 461         struct active_request_slot *slot;
 462         struct curl_slist *headers = NULL;
 463         struct strbuf buf = STRBUF_INIT;
 464         int err;
 465
 466         slot = get_active_slot();
 467
 468         headers = curl_slist_append(headers, rpc->hdr_content_type);
 469         headers = curl_slist_append(headers, rpc->hdr_accept);
 470
 471         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 472         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 473         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 474         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 475         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 476         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 477         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 478         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 479         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 480
 481         err = run_slot(slot, results);
 482
 483         curl_slist_free_all(headers);
 484         strbuf_release(&buf);
 485         return err;
 486 }
 487
 488 static int post_rpc(struct rpc_state *rpc)
 489 {
 490         struct active_request_slot *slot;
 491         struct curl_slist *headers = NULL;
 492         int use_gzip = rpc->gzip_request;
 493         char *gzip_body = NULL;
 494         size_t gzip_size = 0;
 495         int err, large_request = 0;
 496         int needs_100_continue = 0;
 497
 498         /* Try to load the entire request, if we can fit it into the
 499          * allocated buffer space we can use HTTP/1.0 and avoid the
 500          * chunked encoding mess.
 501          */
 502         while (1) {
 503                 size_t left = rpc->alloc - rpc->len;
 504                 char *buf = rpc->buf + rpc->len;
 505                 int n;
 506
 507                 if (left < LARGE_PACKET_MAX) {
 508                         large_request = 1;
 509                         use_gzip = 0;
 510                         break;
 511                 }
 512
 513                 n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 514                 if (!n)
 515                         break;
 516                 rpc->len += n;
 517         }
 518
 519         if (large_request) {
 520                 struct slot_results results;
 521
 522                 do {
 523                         err = probe_rpc(rpc, &results);
 524                         if (err == HTTP_REAUTH)
 525                                 credential_fill(&http_auth);
 526                 } while (err == HTTP_REAUTH);
 527                 if (err != HTTP_OK)
 528                         return -1;
 529
 530                 if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 531                         needs_100_continue = 1;
 532         }
 533
 534         headers = curl_slist_append(headers, rpc->hdr_content_type);
 535         headers = curl_slist_append(headers, rpc->hdr_accept);
 536         headers = curl_slist_append(headers, needs_100_continue ?
 537                 "Expect: 100-continue" : "Expect:");
 538
 539 retry:
 540         slot = get_active_slot();
 541
 542         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 543         curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 544         curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 545         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 546
 547         if (large_request) {
 548                 /* The request body is large and the size cannot be predicted.
 549                  * We must use chunked encoding to send it.
 550                  */
 551                 headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 552                 rpc->initial_buffer = 1;
 553                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 554                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 555 #ifndef NO_CURL_IOCTL
 556                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 557                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 558 #endif
 559                 if (options.verbosity > 1) {
 560                         fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 561                         fflush(stderr);
 562                 }
 563
 564         } else if (gzip_body) {
 565                 /*
 566                  * If we are looping to retry authentication, then the previous
 567                  * run will have set up the headers and gzip buffer already,
 568                  * and we just need to send it.
 569                  */
 570                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 571                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 572
 573         } else if (use_gzip && 1024 < rpc->len) {
 574                 /* The client backend isn't giving us compressed data so
 575                  * we can try to deflate it ourselves, this may save on.
 576                  * the transfer time.
 577                  */
 578                 git_zstream stream;
 579                 int ret;
 580
 581                 git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 582                 gzip_size = git_deflate_bound(&stream, rpc->len);
 583                 gzip_body = xmalloc(gzip_size);
 584
 585                 stream.next_in = (unsigned char *)rpc->buf;
 586                 stream.avail_in = rpc->len;
 587                 stream.next_out = (unsigned char *)gzip_body;
 588                 stream.avail_out = gzip_size;
 589
 590                 ret = git_deflate(&stream, Z_FINISH);
 591                 if (ret != Z_STREAM_END)
 592                         die("cannot deflate request; zlib deflate error %d", ret);
 593
 594                 ret = git_deflate_end_gently(&stream);
 595                 if (ret != Z_OK)
 596                         die("cannot deflate request; zlib end error %d", ret);
 597
 598                 gzip_size = stream.total_out;
 599
 600                 headers = curl_slist_append(headers, "Content-Encoding: gzip");
 601                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 602                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 603
 604                 if (options.verbosity > 1) {
 605                         fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 606                                 rpc->service_name,
 607                                 (unsigned long)rpc->len, (unsigned long)gzip_size);
 608                         fflush(stderr);
 609                 }
 610         } else {
 611                 /* We know the complete request size in advance, use the
 612                  * more normal Content-Length approach.
 613                  */
 614                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 615                 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 616                 if (options.verbosity > 1) {
 617                         fprintf(stderr, "POST %s (%lu bytes)\n",
 618                                 rpc->service_name, (unsigned long)rpc->len);
 619                         fflush(stderr);
 620                 }
 621         }
 622
 623         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 624         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 625         curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 626
 627         err = run_slot(slot, NULL);
 628         if (err == HTTP_REAUTH && !large_request) {
 629                 credential_fill(&http_auth);
 630                 goto retry;
 631         }
 632         if (err != HTTP_OK)
 633                 err = -1;
 634
 635         curl_slist_free_all(headers);
 636         free(gzip_body);
 637         return err;
 638 }
 639
 640 static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 641 {
 642         const char *svc = rpc->service_name;
 643         struct strbuf buf = STRBUF_INIT;
 644         struct strbuf *preamble = rpc->stdin_preamble;
 645         struct child_process client = CHILD_PROCESS_INIT;
 646         int err = 0;
 647
 648         client.in = -1;
 649         client.out = -1;
 650         client.git_cmd = 1;
 651         client.argv = rpc->argv;
 652         if (start_command(&client))
 653                 exit(1);
 654         if (preamble)
 655                 write_or_die(client.in, preamble->buf, preamble->len);
 656         if (heads)
 657                 write_or_die(client.in, heads->buf, heads->len);
 658
 659         rpc->alloc = http_post_buffer;
 660         rpc->buf = xmalloc(rpc->alloc);
 661         rpc->in = client.in;
 662         rpc->out = client.out;
 663         strbuf_init(&rpc->result, 0);
 664
 665         strbuf_addf(&buf, "%s%s", url.buf, svc);
 666         rpc->service_url = strbuf_detach(&buf, NULL);
 667
 668         strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 669         rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 670
 671         strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 672         rpc->hdr_accept = strbuf_detach(&buf, NULL);
 673
 674         while (!err) {
 675                 int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 676                 if (!n)
 677                         break;
 678                 rpc->pos = 0;
 679                 rpc->len = n;
 680                 err |= post_rpc(rpc);
 681         }
 682
 683         close(client.in);
 684         client.in = -1;
 685         if (!err) {
 686                 strbuf_read(&rpc->result, client.out, 0);
 687         } else {
 688                 char buf[4096];
 689                 for (;;)
 690                         if (xread(client.out, buf, sizeof(buf)) <= 0)
 691                                 break;
 692         }
 693
 694         close(client.out);
 695         client.out = -1;
 696
 697         err |= finish_command(&client);
 698         free(rpc->service_url);
 699         free(rpc->hdr_content_type);
 700         free(rpc->hdr_accept);
 701         free(rpc->buf);
 702         strbuf_release(&buf);
 703         return err;
 704 }
 705
 706 static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 707 {
 708         struct walker *walker;
 709         char **targets = xmalloc(nr_heads * sizeof(char*));
 710         int ret, i;
 711
 712         if (options.depth || options.deepen_since)
 713                 die("dumb http transport does not support shallow capabilities");
 714         for (i = 0; i < nr_heads; i++)
 715                 targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
 716
 717         walker = get_http_walker(url.buf);
 718         walker->get_all = 1;
 719         walker->get_tree = 1;
 720         walker->get_history = 1;
 721         walker->get_verbosely = options.verbosity >= 3;
 722         walker->get_recover = 0;
 723         ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 724         walker_free(walker);
 725
 726         for (i = 0; i < nr_heads; i++)
 727                 free(targets[i]);
 728         free(targets);
 729
 730         return ret ? error("fetch failed.") : 0;
 731 }
 732
 733 static int fetch_git(struct discovery *heads,
 734         int nr_heads, struct ref **to_fetch)
 735 {
 736         struct rpc_state rpc;
 737         struct strbuf preamble = STRBUF_INIT;
 738         int i, err;
 739         struct argv_array args = ARGV_ARRAY_INIT;
 740
 741         argv_array_pushl(&args, "fetch-pack", "--stateless-rpc",
 742                          "--stdin", "--lock-pack", NULL);
 743         if (options.followtags)
 744                 argv_array_push(&args, "--include-tag");
 745         if (options.thin)
 746                 argv_array_push(&args, "--thin");
 747         if (options.verbosity >= 3)
 748                 argv_array_pushl(&args, "-v", "-v", NULL);
 749         if (options.check_self_contained_and_connected)
 750                 argv_array_push(&args, "--check-self-contained-and-connected");
 751         if (options.cloning)
 752                 argv_array_push(&args, "--cloning");
 753         if (options.update_shallow)
 754                 argv_array_push(&args, "--update-shallow");
 755         if (!options.progress)
 756                 argv_array_push(&args, "--no-progress");
 757         if (options.depth)
 758                 argv_array_pushf(&args, "--depth=%lu", options.depth);
 759         if (options.deepen_since)
 760                 argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since);
 761         for (i = 0; i < options.deepen_not.nr; i++)
 762                 argv_array_pushf(&args, "--shallow-exclude=%s",
 763                                  options.deepen_not.items[i].string);
 764         argv_array_push(&args, url.buf);
 765
 766         for (i = 0; i < nr_heads; i++) {
 767                 struct ref *ref = to_fetch[i];
 768                 if (!*ref->name)
 769                         die("cannot fetch by sha1 over smart http");
 770                 packet_buf_write(&preamble, "%s %s\n",
 771                                  oid_to_hex(&ref->old_oid), ref->name);
 772         }
 773         packet_buf_flush(&preamble);
 774
 775         memset(&rpc, 0, sizeof(rpc));
 776         rpc.service_name = "git-upload-pack",
 777         rpc.argv = args.argv;
 778         rpc.stdin_preamble = &preamble;
 779         rpc.gzip_request = 1;
 780
 781         err = rpc_service(&rpc, heads);
 782         if (rpc.result.len)
 783                 write_or_die(1, rpc.result.buf, rpc.result.len);
 784         strbuf_release(&rpc.result);
 785         strbuf_release(&preamble);
 786         argv_array_clear(&args);
 787         return err;
 788 }
 789
 790 static int fetch(int nr_heads, struct ref **to_fetch)
 791 {
 792         struct discovery *d = discover_refs("git-upload-pack", 0);
 793         if (d->proto_git)
 794                 return fetch_git(d, nr_heads, to_fetch);
 795         else
 796                 return fetch_dumb(nr_heads, to_fetch);
 797 }
 798
 799 static void parse_fetch(struct strbuf *buf)
 800 {
 801         struct ref **to_fetch = NULL;
 802         struct ref *list_head = NULL;
 803         struct ref **list = &list_head;
 804         int alloc_heads = 0, nr_heads = 0;
 805
 806         do {
 807                 const char *p;
 808                 if (skip_prefix(buf->buf, "fetch ", &p)) {
 809                         const char *name;
 810                         struct ref *ref;
 811                         struct object_id old_oid;
 812
 813                         if (get_oid_hex(p, &old_oid))
 814                                 die("protocol error: expected sha/ref, got %s'", p);
 815                         if (p[GIT_SHA1_HEXSZ] == ' ')
 816                                 name = p + GIT_SHA1_HEXSZ + 1;
 817                         else if (!p[GIT_SHA1_HEXSZ])
 818                                 name = "";
 819                         else
 820                                 die("protocol error: expected sha/ref, got %s'", p);
 821
 822                         ref = alloc_ref(name);
 823                         oidcpy(&ref->old_oid, &old_oid);
 824
 825                         *list = ref;
 826                         list = &ref->next;
 827
 828                         ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 829                         to_fetch[nr_heads++] = ref;
 830                 }
 831                 else
 832                         die("http transport does not support %s", buf->buf);
 833
 834                 strbuf_reset(buf);
 835                 if (strbuf_getline_lf(buf, stdin) == EOF)
 836                         return;
 837                 if (!*buf->buf)
 838                         break;
 839         } while (1);
 840
 841         if (fetch(nr_heads, to_fetch))
 842                 exit(128); /* error already reported */
 843         free_refs(list_head);
 844         free(to_fetch);
 845
 846         printf("\n");
 847         fflush(stdout);
 848         strbuf_reset(buf);
 849 }
 850
 851 static int push_dav(int nr_spec, char **specs)
 852 {
 853         const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 854         int argc = 0, i;
 855
 856         argv[argc++] = "http-push";
 857         argv[argc++] = "--helper-status";
 858         if (options.dry_run)
 859                 argv[argc++] = "--dry-run";
 860         if (options.verbosity > 1)
 861                 argv[argc++] = "--verbose";
 862         argv[argc++] = url.buf;
 863         for (i = 0; i < nr_spec; i++)
 864                 argv[argc++] = specs[i];
 865         argv[argc++] = NULL;
 866
 867         if (run_command_v_opt(argv, RUN_GIT_CMD))
 868                 die("git-%s failed", argv[0]);
 869         free(argv);
 870         return 0;
 871 }
 872
 873 static int push_git(struct discovery *heads, int nr_spec, char **specs)
 874 {
 875         struct rpc_state rpc;
 876         int i, err;
 877         struct argv_array args;
 878         struct string_list_item *cas_option;
 879         struct strbuf preamble = STRBUF_INIT;
 880
 881         argv_array_init(&args);
 882         argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 883                          NULL);
 884
 885         if (options.thin)
 886                 argv_array_push(&args, "--thin");
 887         if (options.dry_run)
 888                 argv_array_push(&args, "--dry-run");
 889         if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
 890                 argv_array_push(&args, "--signed=yes");
 891         else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
 892                 argv_array_push(&args, "--signed=if-asked");
 893         if (options.verbosity == 0)
 894                 argv_array_push(&args, "--quiet");
 895         else if (options.verbosity > 1)
 896                 argv_array_push(&args, "--verbose");
 897         argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 898         for_each_string_list_item(cas_option, &cas_options)
 899                 argv_array_push(&args, cas_option->string);
 900         argv_array_push(&args, url.buf);
 901
 902         argv_array_push(&args, "--stdin");
 903         for (i = 0; i < nr_spec; i++)
 904                 packet_buf_write(&preamble, "%s\n", specs[i]);
 905         packet_buf_flush(&preamble);
 906
 907         memset(&rpc, 0, sizeof(rpc));
 908         rpc.service_name = "git-receive-pack",
 909         rpc.argv = args.argv;
 910         rpc.stdin_preamble = &preamble;
 911
 912         err = rpc_service(&rpc, heads);
 913         if (rpc.result.len)
 914                 write_or_die(1, rpc.result.buf, rpc.result.len);
 915         strbuf_release(&rpc.result);
 916         strbuf_release(&preamble);
 917         argv_array_clear(&args);
 918         return err;
 919 }
 920
 921 static int push(int nr_spec, char **specs)
 922 {
 923         struct discovery *heads = discover_refs("git-receive-pack", 1);
 924         int ret;
 925
 926         if (heads->proto_git)
 927                 ret = push_git(heads, nr_spec, specs);
 928         else
 929                 ret = push_dav(nr_spec, specs);
 930         free_discovery(heads);
 931         return ret;
 932 }
 933
 934 static void parse_push(struct strbuf *buf)
 935 {
 936         char **specs = NULL;
 937         int alloc_spec = 0, nr_spec = 0, i, ret;
 938
 939         do {
 940                 if (starts_with(buf->buf, "push ")) {
 941                         ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 942                         specs[nr_spec++] = xstrdup(buf->buf + 5);
 943                 }
 944                 else
 945                         die("http transport does not support %s", buf->buf);
 946
 947                 strbuf_reset(buf);
 948                 if (strbuf_getline_lf(buf, stdin) == EOF)
 949                         goto free_specs;
 950                 if (!*buf->buf)
 951                         break;
 952         } while (1);
 953
 954         ret = push(nr_spec, specs);
 955         printf("\n");
 956         fflush(stdout);
 957
 958         if (ret)
 959                 exit(128); /* error already reported */
 960
 961  free_specs:
 962         for (i = 0; i < nr_spec; i++)
 963                 free(specs[i]);
 964         free(specs);
 965 }
 966
 967 int main(int argc, const char **argv)
 968 {
 969         struct strbuf buf = STRBUF_INIT;
 970         int nongit;
 971
 972         git_setup_gettext();
 973
 974         git_extract_argv0_path(argv[0]);
 975         setup_git_directory_gently(&nongit);
 976         if (argc < 2) {
 977                 error("remote-curl: usage: git remote-curl <remote> [<url>]");
 978                 return 1;
 979         }
 980
 981         options.verbosity = 1;
 982         options.progress = !!isatty(2);
 983         options.thin = 1;
 984         string_list_init(&options.deepen_not, 1);
 985
 986         remote = remote_get(argv[1]);
 987
 988         if (argc > 2) {
 989                 end_url_with_slash(&url, argv[2]);
 990         } else {
 991                 end_url_with_slash(&url, remote->url[0]);
 992         }
 993
 994         http_init(remote, url.buf, 0);
 995
 996         do {
 997                 const char *arg;
 998
 999                 if (strbuf_getline_lf(&buf, stdin) == EOF) {
1000                         if (ferror(stdin))
1001                                 error("remote-curl: error reading command stream from git");
1002                         return 1;
1003                 }
1004                 if (buf.len == 0)
1005                         break;
1006                 if (starts_with(buf.buf, "fetch ")) {
1007                         if (nongit)
1008                                 die("remote-curl: fetch attempted without a local repo");
1009                         parse_fetch(&buf);
1010
1011                 } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1012                         int for_push = !!strstr(buf.buf + 4, "for-push");
1013                         output_refs(get_refs(for_push));
1014
1015                 } else if (starts_with(buf.buf, "push ")) {
1016                         parse_push(&buf);
1017
1018                 } else if (skip_prefix(buf.buf, "option ", &arg)) {
1019                         char *value = strchr(arg, ' ');
1020                         int result;
1021
1022                         if (value)
1023                                 *value++ = '\0';
1024                         else
1025                                 value = "true";
1026
1027                         result = set_option(arg, value);
1028                         if (!result)
1029                                 printf("ok\n");
1030                         else if (result < 0)
1031                                 printf("error invalid value\n");
1032                         else
1033                                 printf("unsupported\n");
1034                         fflush(stdout);
1035
1036                 } else if (!strcmp(buf.buf, "capabilities")) {
1037                         printf("fetch\n");
1038                         printf("option\n");
1039                         printf("push\n");
1040                         printf("check-connectivity\n");
1041                         printf("\n");
1042                         fflush(stdout);
1043                 } else {
1044                         error("remote-curl: unknown command '%s' from git", buf.buf);
1045                         return 1;
1046                 }
1047                 strbuf_reset(&buf);
1048         } while (1);
1049
1050         http_cleanup();
1051
1052         return 0;
1053 }