Andrew's git / gitweb.git / remote-curl.c
?
remote-curl.con commit http: respect protocol.*.allow=user for http-alternates (abcbdc0)
   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
  16static struct remote *remote;
  17/* always ends with a trailing slash */
  18static struct strbuf url = STRBUF_INIT;
  19
  20struct options {
  21        int verbosity;
  22        unsigned long depth;
  23        unsigned progress : 1,
  24                check_self_contained_and_connected : 1,
  25                cloning : 1,
  26                update_shallow : 1,
  27                followtags : 1,
  28                dry_run : 1,
  29                thin : 1,
  30                /* One of the SEND_PACK_PUSH_CERT_* constants. */
  31                push_cert : 2;
  32};
  33static struct options options;
  34static struct string_list cas_options = STRING_LIST_INIT_DUP;
  35
  36static int set_option(const char *name, const char *value)
  37{
  38        if (!strcmp(name, "verbosity")) {
  39                char *end;
  40                int v = strtol(value, &end, 10);
  41                if (value == end || *end)
  42                        return -1;
  43                options.verbosity = v;
  44                return 0;
  45        }
  46        else if (!strcmp(name, "progress")) {
  47                if (!strcmp(value, "true"))
  48                        options.progress = 1;
  49                else if (!strcmp(value, "false"))
  50                        options.progress = 0;
  51                else
  52                        return -1;
  53                return 0;
  54        }
  55        else if (!strcmp(name, "depth")) {
  56                char *end;
  57                unsigned long v = strtoul(value, &end, 10);
  58                if (value == end || *end)
  59                        return -1;
  60                options.depth = v;
  61                return 0;
  62        }
  63        else if (!strcmp(name, "followtags")) {
  64                if (!strcmp(value, "true"))
  65                        options.followtags = 1;
  66                else if (!strcmp(value, "false"))
  67                        options.followtags = 0;
  68                else
  69                        return -1;
  70                return 0;
  71        }
  72        else if (!strcmp(name, "dry-run")) {
  73                if (!strcmp(value, "true"))
  74                        options.dry_run = 1;
  75                else if (!strcmp(value, "false"))
  76                        options.dry_run = 0;
  77                else
  78                        return -1;
  79                return 0;
  80        }
  81        else if (!strcmp(name, "check-connectivity")) {
  82                if (!strcmp(value, "true"))
  83                        options.check_self_contained_and_connected = 1;
  84                else if (!strcmp(value, "false"))
  85                        options.check_self_contained_and_connected = 0;
  86                else
  87                        return -1;
  88                return 0;
  89        }
  90        else if (!strcmp(name, "cas")) {
  91                struct strbuf val = STRBUF_INIT;
  92                strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
  93                string_list_append(&cas_options, val.buf);
  94                strbuf_release(&val);
  95                return 0;
  96        } else if (!strcmp(name, "cloning")) {
  97                if (!strcmp(value, "true"))
  98                        options.cloning = 1;
  99                else if (!strcmp(value, "false"))
 100                        options.cloning = 0;
 101                else
 102                        return -1;
 103                return 0;
 104        } else if (!strcmp(name, "update-shallow")) {
 105                if (!strcmp(value, "true"))
 106                        options.update_shallow = 1;
 107                else if (!strcmp(value, "false"))
 108                        options.update_shallow = 0;
 109                else
 110                        return -1;
 111                return 0;
 112        } else if (!strcmp(name, "pushcert")) {
 113                if (!strcmp(value, "true"))
 114                        options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 115                else if (!strcmp(value, "false"))
 116                        options.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 117                else if (!strcmp(value, "if-asked"))
 118                        options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 119                else
 120                        return -1;
 121                return 0;
 122
 123#if LIBCURL_VERSION_NUM >= 0x070a08
 124        } else if (!strcmp(name, "family")) {
 125                if (!strcmp(value, "ipv4"))
 126                        git_curl_ipresolve = CURL_IPRESOLVE_V4;
 127                else if (!strcmp(value, "ipv6"))
 128                        git_curl_ipresolve = CURL_IPRESOLVE_V6;
 129                else if (!strcmp(value, "all"))
 130                        git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
 131                else
 132                        return -1;
 133                return 0;
 134#endif /* LIBCURL_VERSION_NUM >= 0x070a08 */
 135        } else {
 136                return 1 /* unsupported */;
 137        }
 138}
 139
 140struct discovery {
 141        const char *service;
 142        char *buf_alloc;
 143        char *buf;
 144        size_t len;
 145        struct ref *refs;
 146        struct sha1_array shallow;
 147        unsigned proto_git : 1;
 148};
 149static struct discovery *last_discovery;
 150
 151static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 152{
 153        struct ref *list = NULL;
 154        get_remote_heads(-1, heads->buf, heads->len, &list,
 155                         for_push ? REF_NORMAL : 0, NULL, &heads->shallow);
 156        return list;
 157}
 158
 159static struct ref *parse_info_refs(struct discovery *heads)
 160{
 161        char *data, *start, *mid;
 162        char *ref_name;
 163        int i = 0;
 164
 165        struct ref *refs = NULL;
 166        struct ref *ref = NULL;
 167        struct ref *last_ref = NULL;
 168
 169        data = heads->buf;
 170        start = NULL;
 171        mid = data;
 172        while (i < heads->len) {
 173                if (!start) {
 174                        start = &data[i];
 175                }
 176                if (data[i] == '\t')
 177                        mid = &data[i];
 178                if (data[i] == '\n') {
 179                        if (mid - start != 40)
 180                                die("%sinfo/refs not valid: is this a git repository?",
 181                                    url.buf);
 182                        data[i] = 0;
 183                        ref_name = mid + 1;
 184                        ref = alloc_ref(ref_name);
 185                        get_oid_hex(start, &ref->old_oid);
 186                        if (!refs)
 187                                refs = ref;
 188                        if (last_ref)
 189                                last_ref->next = ref;
 190                        last_ref = ref;
 191                        start = NULL;
 192                }
 193                i++;
 194        }
 195
 196        ref = alloc_ref("HEAD");
 197        if (!http_fetch_ref(url.buf, ref) &&
 198            !resolve_remote_symref(ref, refs)) {
 199                ref->next = refs;
 200                refs = ref;
 201        } else {
 202                free(ref);
 203        }
 204
 205        return refs;
 206}
 207
 208static void free_discovery(struct discovery *d)
 209{
 210        if (d) {
 211                if (d == last_discovery)
 212                        last_discovery = NULL;
 213                free(d->shallow.sha1);
 214                free(d->buf_alloc);
 215                free_refs(d->refs);
 216                free(d);
 217        }
 218}
 219
 220static int show_http_message(struct strbuf *type, struct strbuf *charset,
 221                             struct strbuf *msg)
 222{
 223        const char *p, *eol;
 224
 225        /*
 226         * We only show text/plain parts, as other types are likely
 227         * to be ugly to look at on the user's terminal.
 228         */
 229        if (strcmp(type->buf, "text/plain"))
 230                return -1;
 231        if (charset->len)
 232                strbuf_reencode(msg, charset->buf, get_log_output_encoding());
 233
 234        strbuf_trim(msg);
 235        if (!msg->len)
 236                return -1;
 237
 238        p = msg->buf;
 239        do {
 240                eol = strchrnul(p, '\n');
 241                fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 242                p = eol + 1;
 243        } while(*eol);
 244        return 0;
 245}
 246
 247static struct discovery *discover_refs(const char *service, int for_push)
 248{
 249        struct strbuf exp = STRBUF_INIT;
 250        struct strbuf type = STRBUF_INIT;
 251        struct strbuf charset = STRBUF_INIT;
 252        struct strbuf buffer = STRBUF_INIT;
 253        struct strbuf refs_url = STRBUF_INIT;
 254        struct strbuf effective_url = STRBUF_INIT;
 255        struct discovery *last = last_discovery;
 256        int http_ret, maybe_smart = 0;
 257        struct http_get_options http_options;
 258
 259        if (last && !strcmp(service, last->service))
 260                return last;
 261        free_discovery(last);
 262
 263        strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 264        if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 265             git_env_bool("GIT_SMART_HTTP", 1)) {
 266                maybe_smart = 1;
 267                if (!strchr(url.buf, '?'))
 268                        strbuf_addch(&refs_url, '?');
 269                else
 270                        strbuf_addch(&refs_url, '&');
 271                strbuf_addf(&refs_url, "service=%s", service);
 272        }
 273
 274        memset(&http_options, 0, sizeof(http_options));
 275        http_options.content_type = &type;
 276        http_options.charset = &charset;
 277        http_options.effective_url = &effective_url;
 278        http_options.base_url = &url;
 279        http_options.initial_request = 1;
 280        http_options.no_cache = 1;
 281        http_options.keep_error = 1;
 282
 283        http_ret = http_get_strbuf(refs_url.buf, &buffer, &http_options);
 284        switch (http_ret) {
 285        case HTTP_OK:
 286                break;
 287        case HTTP_MISSING_TARGET:
 288                show_http_message(&type, &charset, &buffer);
 289                die("repository '%s' not found", url.buf);
 290        case HTTP_NOAUTH:
 291                show_http_message(&type, &charset, &buffer);
 292                die("Authentication failed for '%s'", url.buf);
 293        default:
 294                show_http_message(&type, &charset, &buffer);
 295                die("unable to access '%s': %s", url.buf, curl_errorstr);
 296        }
 297
 298        if (options.verbosity && !starts_with(refs_url.buf, url.buf))
 299                warning(_("redirecting to %s"), url.buf);
 300
 301        last= xcalloc(1, sizeof(*last_discovery));
 302        last->service = service;
 303        last->buf_alloc = strbuf_detach(&buffer, &last->len);
 304        last->buf = last->buf_alloc;
 305
 306        strbuf_addf(&exp, "application/x-%s-advertisement", service);
 307        if (maybe_smart &&
 308            (5 <= last->len && last->buf[4] == '#') &&
 309            !strbuf_cmp(&exp, &type)) {
 310                char *line;
 311
 312                /*
 313                 * smart HTTP response; validate that the service
 314                 * pkt-line matches our request.
 315                 */
 316                line = packet_read_line_buf(&last->buf, &last->len, NULL);
 317
 318                strbuf_reset(&exp);
 319                strbuf_addf(&exp, "# service=%s", service);
 320                if (strcmp(line, exp.buf))
 321                        die("invalid server response; got '%s'", line);
 322                strbuf_release(&exp);
 323
 324                /* The header can include additional metadata lines, up
 325                 * until a packet flush marker.  Ignore these now, but
 326                 * in the future we might start to scan them.
 327                 */
 328                while (packet_read_line_buf(&last->buf, &last->len, NULL))
 329                        ;
 330
 331                last->proto_git = 1;
 332        }
 333
 334        if (last->proto_git)
 335                last->refs = parse_git_refs(last, for_push);
 336        else
 337                last->refs = parse_info_refs(last);
 338
 339        strbuf_release(&refs_url);
 340        strbuf_release(&exp);
 341        strbuf_release(&type);
 342        strbuf_release(&charset);
 343        strbuf_release(&effective_url);
 344        strbuf_release(&buffer);
 345        last_discovery = last;
 346        return last;
 347}
 348
 349static struct ref *get_refs(int for_push)
 350{
 351        struct discovery *heads;
 352
 353        if (for_push)
 354                heads = discover_refs("git-receive-pack", for_push);
 355        else
 356                heads = discover_refs("git-upload-pack", for_push);
 357
 358        return heads->refs;
 359}
 360
 361static void output_refs(struct ref *refs)
 362{
 363        struct ref *posn;
 364        for (posn = refs; posn; posn = posn->next) {
 365                if (posn->symref)
 366                        printf("@%s %s\n", posn->symref, posn->name);
 367                else
 368                        printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name);
 369        }
 370        printf("\n");
 371        fflush(stdout);
 372}
 373
 374struct rpc_state {
 375        const char *service_name;
 376        const char **argv;
 377        struct strbuf *stdin_preamble;
 378        char *service_url;
 379        char *hdr_content_type;
 380        char *hdr_accept;
 381        char *buf;
 382        size_t alloc;
 383        size_t len;
 384        size_t pos;
 385        int in;
 386        int out;
 387        struct strbuf result;
 388        unsigned gzip_request : 1;
 389        unsigned initial_buffer : 1;
 390};
 391
 392static size_t rpc_out(void *ptr, size_t eltsize,
 393                size_t nmemb, void *buffer_)
 394{
 395        size_t max = eltsize * nmemb;
 396        struct rpc_state *rpc = buffer_;
 397        size_t avail = rpc->len - rpc->pos;
 398
 399        if (!avail) {
 400                rpc->initial_buffer = 0;
 401                avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 402                if (!avail)
 403                        return 0;
 404                rpc->pos = 0;
 405                rpc->len = avail;
 406        }
 407
 408        if (max < avail)
 409                avail = max;
 410        memcpy(ptr, rpc->buf + rpc->pos, avail);
 411        rpc->pos += avail;
 412        return avail;
 413}
 414
 415#ifndef NO_CURL_IOCTL
 416static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 417{
 418        struct rpc_state *rpc = clientp;
 419
 420        switch (cmd) {
 421        case CURLIOCMD_NOP:
 422                return CURLIOE_OK;
 423
 424        case CURLIOCMD_RESTARTREAD:
 425                if (rpc->initial_buffer) {
 426                        rpc->pos = 0;
 427                        return CURLIOE_OK;
 428                }
 429                error("unable to rewind rpc post data - try increasing http.postBuffer");
 430                return CURLIOE_FAILRESTART;
 431
 432        default:
 433                return CURLIOE_UNKNOWNCMD;
 434        }
 435}
 436#endif
 437
 438static size_t rpc_in(char *ptr, size_t eltsize,
 439                size_t nmemb, void *buffer_)
 440{
 441        size_t size = eltsize * nmemb;
 442        struct rpc_state *rpc = buffer_;
 443        write_or_die(rpc->in, ptr, size);
 444        return size;
 445}
 446
 447static int run_slot(struct active_request_slot *slot,
 448                    struct slot_results *results)
 449{
 450        int err;
 451        struct slot_results results_buf;
 452
 453        if (!results)
 454                results = &results_buf;
 455
 456        err = run_one_slot(slot, results);
 457
 458        if (err != HTTP_OK && err != HTTP_REAUTH) {
 459                struct strbuf msg = STRBUF_INIT;
 460                if (results->http_code && results->http_code != 200)
 461                        strbuf_addf(&msg, "HTTP %ld", results->http_code);
 462                if (results->curl_result != CURLE_OK) {
 463                        if (msg.len)
 464                                strbuf_addch(&msg, ' ');
 465                        strbuf_addf(&msg, "curl %d", results->curl_result);
 466                        if (curl_errorstr[0]) {
 467                                strbuf_addch(&msg, ' ');
 468                                strbuf_addstr(&msg, curl_errorstr);
 469                        }
 470                }
 471                error("RPC failed; %s", msg.buf);
 472                strbuf_release(&msg);
 473        }
 474
 475        return err;
 476}
 477
 478static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 479{
 480        struct active_request_slot *slot;
 481        struct curl_slist *headers = http_copy_default_headers();
 482        struct strbuf buf = STRBUF_INIT;
 483        int err;
 484
 485        slot = get_active_slot();
 486
 487        headers = curl_slist_append(headers, rpc->hdr_content_type);
 488        headers = curl_slist_append(headers, rpc->hdr_accept);
 489
 490        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 491        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 492        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 493        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 494        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 495        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 496        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 497        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 498        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 499
 500        err = run_slot(slot, results);
 501
 502        curl_slist_free_all(headers);
 503        strbuf_release(&buf);
 504        return err;
 505}
 506
 507static int post_rpc(struct rpc_state *rpc)
 508{
 509        struct active_request_slot *slot;
 510        struct curl_slist *headers = http_copy_default_headers();
 511        int use_gzip = rpc->gzip_request;
 512        char *gzip_body = NULL;
 513        size_t gzip_size = 0;
 514        int err, large_request = 0;
 515        int needs_100_continue = 0;
 516
 517        /* Try to load the entire request, if we can fit it into the
 518         * allocated buffer space we can use HTTP/1.0 and avoid the
 519         * chunked encoding mess.
 520         */
 521        while (1) {
 522                size_t left = rpc->alloc - rpc->len;
 523                char *buf = rpc->buf + rpc->len;
 524                int n;
 525
 526                if (left < LARGE_PACKET_MAX) {
 527                        large_request = 1;
 528                        use_gzip = 0;
 529                        break;
 530                }
 531
 532                n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 533                if (!n)
 534                        break;
 535                rpc->len += n;
 536        }
 537
 538        if (large_request) {
 539                struct slot_results results;
 540
 541                do {
 542                        err = probe_rpc(rpc, &results);
 543                        if (err == HTTP_REAUTH)
 544                                credential_fill(&http_auth);
 545                } while (err == HTTP_REAUTH);
 546                if (err != HTTP_OK)
 547                        return -1;
 548
 549                if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 550                        needs_100_continue = 1;
 551        }
 552
 553        headers = curl_slist_append(headers, rpc->hdr_content_type);
 554        headers = curl_slist_append(headers, rpc->hdr_accept);
 555        headers = curl_slist_append(headers, needs_100_continue ?
 556                "Expect: 100-continue" : "Expect:");
 557
 558retry:
 559        slot = get_active_slot();
 560
 561        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 562        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 563        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 564        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 565
 566        if (large_request) {
 567                /* The request body is large and the size cannot be predicted.
 568                 * We must use chunked encoding to send it.
 569                 */
 570                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 571                rpc->initial_buffer = 1;
 572                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 573                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 574#ifndef NO_CURL_IOCTL
 575                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 576                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 577#endif
 578                if (options.verbosity > 1) {
 579                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 580                        fflush(stderr);
 581                }
 582
 583        } else if (gzip_body) {
 584                /*
 585                 * If we are looping to retry authentication, then the previous
 586                 * run will have set up the headers and gzip buffer already,
 587                 * and we just need to send it.
 588                 */
 589                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 590                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 591
 592        } else if (use_gzip && 1024 < rpc->len) {
 593                /* The client backend isn't giving us compressed data so
 594                 * we can try to deflate it ourselves, this may save on.
 595                 * the transfer time.
 596                 */
 597                git_zstream stream;
 598                int ret;
 599
 600                git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 601                gzip_size = git_deflate_bound(&stream, rpc->len);
 602                gzip_body = xmalloc(gzip_size);
 603
 604                stream.next_in = (unsigned char *)rpc->buf;
 605                stream.avail_in = rpc->len;
 606                stream.next_out = (unsigned char *)gzip_body;
 607                stream.avail_out = gzip_size;
 608
 609                ret = git_deflate(&stream, Z_FINISH);
 610                if (ret != Z_STREAM_END)
 611                        die("cannot deflate request; zlib deflate error %d", ret);
 612
 613                ret = git_deflate_end_gently(&stream);
 614                if (ret != Z_OK)
 615                        die("cannot deflate request; zlib end error %d", ret);
 616
 617                gzip_size = stream.total_out;
 618
 619                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 620                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 621                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 622
 623                if (options.verbosity > 1) {
 624                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 625                                rpc->service_name,
 626                                (unsigned long)rpc->len, (unsigned long)gzip_size);
 627                        fflush(stderr);
 628                }
 629        } else {
 630                /* We know the complete request size in advance, use the
 631                 * more normal Content-Length approach.
 632                 */
 633                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 634                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 635                if (options.verbosity > 1) {
 636                        fprintf(stderr, "POST %s (%lu bytes)\n",
 637                                rpc->service_name, (unsigned long)rpc->len);
 638                        fflush(stderr);
 639                }
 640        }
 641
 642        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 643        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 644        curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 645
 646        err = run_slot(slot, NULL);
 647        if (err == HTTP_REAUTH && !large_request) {
 648                credential_fill(&http_auth);
 649                goto retry;
 650        }
 651        if (err != HTTP_OK)
 652                err = -1;
 653
 654        curl_slist_free_all(headers);
 655        free(gzip_body);
 656        return err;
 657}
 658
 659static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 660{
 661        const char *svc = rpc->service_name;
 662        struct strbuf buf = STRBUF_INIT;
 663        struct strbuf *preamble = rpc->stdin_preamble;
 664        struct child_process client = CHILD_PROCESS_INIT;
 665        int err = 0;
 666
 667        client.in = -1;
 668        client.out = -1;
 669        client.git_cmd = 1;
 670        client.argv = rpc->argv;
 671        if (start_command(&client))
 672                exit(1);
 673        if (preamble)
 674                write_or_die(client.in, preamble->buf, preamble->len);
 675        if (heads)
 676                write_or_die(client.in, heads->buf, heads->len);
 677
 678        rpc->alloc = http_post_buffer;
 679        rpc->buf = xmalloc(rpc->alloc);
 680        rpc->in = client.in;
 681        rpc->out = client.out;
 682        strbuf_init(&rpc->result, 0);
 683
 684        strbuf_addf(&buf, "%s%s", url.buf, svc);
 685        rpc->service_url = strbuf_detach(&buf, NULL);
 686
 687        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 688        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 689
 690        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 691        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 692
 693        while (!err) {
 694                int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 695                if (!n)
 696                        break;
 697                rpc->pos = 0;
 698                rpc->len = n;
 699                err |= post_rpc(rpc);
 700        }
 701
 702        close(client.in);
 703        client.in = -1;
 704        if (!err) {
 705                strbuf_read(&rpc->result, client.out, 0);
 706        } else {
 707                char buf[4096];
 708                for (;;)
 709                        if (xread(client.out, buf, sizeof(buf)) <= 0)
 710                                break;
 711        }
 712
 713        close(client.out);
 714        client.out = -1;
 715
 716        err |= finish_command(&client);
 717        free(rpc->service_url);
 718        free(rpc->hdr_content_type);
 719        free(rpc->hdr_accept);
 720        free(rpc->buf);
 721        strbuf_release(&buf);
 722        return err;
 723}
 724
 725static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 726{
 727        struct walker *walker;
 728        char **targets;
 729        int ret, i;
 730
 731        ALLOC_ARRAY(targets, nr_heads);
 732        if (options.depth)
 733                die("dumb http transport does not support --depth");
 734        for (i = 0; i < nr_heads; i++)
 735                targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
 736
 737        walker = get_http_walker(url.buf);
 738        walker->get_all = 1;
 739        walker->get_tree = 1;
 740        walker->get_history = 1;
 741        walker->get_verbosely = options.verbosity >= 3;
 742        walker->get_recover = 0;
 743        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 744        walker_free(walker);
 745
 746        for (i = 0; i < nr_heads; i++)
 747                free(targets[i]);
 748        free(targets);
 749
 750        return ret ? error("fetch failed.") : 0;
 751}
 752
 753static int fetch_git(struct discovery *heads,
 754        int nr_heads, struct ref **to_fetch)
 755{
 756        struct rpc_state rpc;
 757        struct strbuf preamble = STRBUF_INIT;
 758        char *depth_arg = NULL;
 759        int argc = 0, i, err;
 760        const char *argv[17];
 761
 762        argv[argc++] = "fetch-pack";
 763        argv[argc++] = "--stateless-rpc";
 764        argv[argc++] = "--stdin";
 765        argv[argc++] = "--lock-pack";
 766        if (options.followtags)
 767                argv[argc++] = "--include-tag";
 768        if (options.thin)
 769                argv[argc++] = "--thin";
 770        if (options.verbosity >= 3) {
 771                argv[argc++] = "-v";
 772                argv[argc++] = "-v";
 773        }
 774        if (options.check_self_contained_and_connected)
 775                argv[argc++] = "--check-self-contained-and-connected";
 776        if (options.cloning)
 777                argv[argc++] = "--cloning";
 778        if (options.update_shallow)
 779                argv[argc++] = "--update-shallow";
 780        if (!options.progress)
 781                argv[argc++] = "--no-progress";
 782        if (options.depth) {
 783                struct strbuf buf = STRBUF_INIT;
 784                strbuf_addf(&buf, "--depth=%lu", options.depth);
 785                depth_arg = strbuf_detach(&buf, NULL);
 786                argv[argc++] = depth_arg;
 787        }
 788        argv[argc++] = url.buf;
 789        argv[argc++] = NULL;
 790
 791        for (i = 0; i < nr_heads; i++) {
 792                struct ref *ref = to_fetch[i];
 793                if (!*ref->name)
 794                        die("cannot fetch by sha1 over smart http");
 795                packet_buf_write(&preamble, "%s %s\n",
 796                                 oid_to_hex(&ref->old_oid), ref->name);
 797        }
 798        packet_buf_flush(&preamble);
 799
 800        memset(&rpc, 0, sizeof(rpc));
 801        rpc.service_name = "git-upload-pack",
 802        rpc.argv = argv;
 803        rpc.stdin_preamble = &preamble;
 804        rpc.gzip_request = 1;
 805
 806        err = rpc_service(&rpc, heads);
 807        if (rpc.result.len)
 808                write_or_die(1, rpc.result.buf, rpc.result.len);
 809        strbuf_release(&rpc.result);
 810        strbuf_release(&preamble);
 811        free(depth_arg);
 812        return err;
 813}
 814
 815static int fetch(int nr_heads, struct ref **to_fetch)
 816{
 817        struct discovery *d = discover_refs("git-upload-pack", 0);
 818        if (d->proto_git)
 819                return fetch_git(d, nr_heads, to_fetch);
 820        else
 821                return fetch_dumb(nr_heads, to_fetch);
 822}
 823
 824static void parse_fetch(struct strbuf *buf)
 825{
 826        struct ref **to_fetch = NULL;
 827        struct ref *list_head = NULL;
 828        struct ref **list = &list_head;
 829        int alloc_heads = 0, nr_heads = 0;
 830
 831        do {
 832                const char *p;
 833                if (skip_prefix(buf->buf, "fetch ", &p)) {
 834                        const char *name;
 835                        struct ref *ref;
 836                        struct object_id old_oid;
 837
 838                        if (get_oid_hex(p, &old_oid))
 839                                die("protocol error: expected sha/ref, got %s'", p);
 840                        if (p[GIT_SHA1_HEXSZ] == ' ')
 841                                name = p + GIT_SHA1_HEXSZ + 1;
 842                        else if (!p[GIT_SHA1_HEXSZ])
 843                                name = "";
 844                        else
 845                                die("protocol error: expected sha/ref, got %s'", p);
 846
 847                        ref = alloc_ref(name);
 848                        oidcpy(&ref->old_oid, &old_oid);
 849
 850                        *list = ref;
 851                        list = &ref->next;
 852
 853                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 854                        to_fetch[nr_heads++] = ref;
 855                }
 856                else
 857                        die("http transport does not support %s", buf->buf);
 858
 859                strbuf_reset(buf);
 860                if (strbuf_getline_lf(buf, stdin) == EOF)
 861                        return;
 862                if (!*buf->buf)
 863                        break;
 864        } while (1);
 865
 866        if (fetch(nr_heads, to_fetch))
 867                exit(128); /* error already reported */
 868        free_refs(list_head);
 869        free(to_fetch);
 870
 871        printf("\n");
 872        fflush(stdout);
 873        strbuf_reset(buf);
 874}
 875
 876static int push_dav(int nr_spec, char **specs)
 877{
 878        struct child_process child = CHILD_PROCESS_INIT;
 879        size_t i;
 880
 881        child.git_cmd = 1;
 882        argv_array_push(&child.args, "http-push");
 883        argv_array_push(&child.args, "--helper-status");
 884        if (options.dry_run)
 885                argv_array_push(&child.args, "--dry-run");
 886        if (options.verbosity > 1)
 887                argv_array_push(&child.args, "--verbose");
 888        argv_array_push(&child.args, url.buf);
 889        for (i = 0; i < nr_spec; i++)
 890                argv_array_push(&child.args, specs[i]);
 891
 892        if (run_command(&child))
 893                die("git-http-push failed");
 894        return 0;
 895}
 896
 897static int push_git(struct discovery *heads, int nr_spec, char **specs)
 898{
 899        struct rpc_state rpc;
 900        int i, err;
 901        struct argv_array args;
 902        struct string_list_item *cas_option;
 903        struct strbuf preamble = STRBUF_INIT;
 904
 905        argv_array_init(&args);
 906        argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 907                         NULL);
 908
 909        if (options.thin)
 910                argv_array_push(&args, "--thin");
 911        if (options.dry_run)
 912                argv_array_push(&args, "--dry-run");
 913        if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
 914                argv_array_push(&args, "--signed=yes");
 915        else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
 916                argv_array_push(&args, "--signed=if-asked");
 917        if (options.verbosity == 0)
 918                argv_array_push(&args, "--quiet");
 919        else if (options.verbosity > 1)
 920                argv_array_push(&args, "--verbose");
 921        argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 922        for_each_string_list_item(cas_option, &cas_options)
 923                argv_array_push(&args, cas_option->string);
 924        argv_array_push(&args, url.buf);
 925
 926        argv_array_push(&args, "--stdin");
 927        for (i = 0; i < nr_spec; i++)
 928                packet_buf_write(&preamble, "%s\n", specs[i]);
 929        packet_buf_flush(&preamble);
 930
 931        memset(&rpc, 0, sizeof(rpc));
 932        rpc.service_name = "git-receive-pack",
 933        rpc.argv = args.argv;
 934        rpc.stdin_preamble = &preamble;
 935
 936        err = rpc_service(&rpc, heads);
 937        if (rpc.result.len)
 938                write_or_die(1, rpc.result.buf, rpc.result.len);
 939        strbuf_release(&rpc.result);
 940        strbuf_release(&preamble);
 941        argv_array_clear(&args);
 942        return err;
 943}
 944
 945static int push(int nr_spec, char **specs)
 946{
 947        struct discovery *heads = discover_refs("git-receive-pack", 1);
 948        int ret;
 949
 950        if (heads->proto_git)
 951                ret = push_git(heads, nr_spec, specs);
 952        else
 953                ret = push_dav(nr_spec, specs);
 954        free_discovery(heads);
 955        return ret;
 956}
 957
 958static void parse_push(struct strbuf *buf)
 959{
 960        char **specs = NULL;
 961        int alloc_spec = 0, nr_spec = 0, i, ret;
 962
 963        do {
 964                if (starts_with(buf->buf, "push ")) {
 965                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 966                        specs[nr_spec++] = xstrdup(buf->buf + 5);
 967                }
 968                else
 969                        die("http transport does not support %s", buf->buf);
 970
 971                strbuf_reset(buf);
 972                if (strbuf_getline_lf(buf, stdin) == EOF)
 973                        goto free_specs;
 974                if (!*buf->buf)
 975                        break;
 976        } while (1);
 977
 978        ret = push(nr_spec, specs);
 979        printf("\n");
 980        fflush(stdout);
 981
 982        if (ret)
 983                exit(128); /* error already reported */
 984
 985 free_specs:
 986        for (i = 0; i < nr_spec; i++)
 987                free(specs[i]);
 988        free(specs);
 989}
 990
 991int cmd_main(int argc, const char **argv)
 992{
 993        struct strbuf buf = STRBUF_INIT;
 994        int nongit;
 995
 996        setup_git_directory_gently(&nongit);
 997        if (argc < 2) {
 998                error("remote-curl: usage: git remote-curl <remote> [<url>]");
 999                return 1;
1000        }
1001
1002        options.verbosity = 1;
1003        options.progress = !!isatty(2);
1004        options.thin = 1;
1005
1006        remote = remote_get(argv[1]);
1007
1008        if (argc > 2) {
1009                end_url_with_slash(&url, argv[2]);
1010        } else {
1011                end_url_with_slash(&url, remote->url[0]);
1012        }
1013
1014        http_init(remote, url.buf, 0);
1015
1016        do {
1017                const char *arg;
1018
1019                if (strbuf_getline_lf(&buf, stdin) == EOF) {
1020                        if (ferror(stdin))
1021                                error("remote-curl: error reading command stream from git");
1022                        return 1;
1023                }
1024                if (buf.len == 0)
1025                        break;
1026                if (starts_with(buf.buf, "fetch ")) {
1027                        if (nongit)
1028                                die("remote-curl: fetch attempted without a local repo");
1029                        parse_fetch(&buf);
1030
1031                } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1032                        int for_push = !!strstr(buf.buf + 4, "for-push");
1033                        output_refs(get_refs(for_push));
1034
1035                } else if (starts_with(buf.buf, "push ")) {
1036                        parse_push(&buf);
1037
1038                } else if (skip_prefix(buf.buf, "option ", &arg)) {
1039                        char *value = strchr(arg, ' ');
1040                        int result;
1041
1042                        if (value)
1043                                *value++ = '\0';
1044                        else
1045                                value = "true";
1046
1047                        result = set_option(arg, value);
1048                        if (!result)
1049                                printf("ok\n");
1050                        else if (result < 0)
1051                                printf("error invalid value\n");
1052                        else
1053                                printf("unsupported\n");
1054                        fflush(stdout);
1055
1056                } else if (!strcmp(buf.buf, "capabilities")) {
1057                        printf("fetch\n");
1058                        printf("option\n");
1059                        printf("push\n");
1060                        printf("check-connectivity\n");
1061                        printf("\n");
1062                        fflush(stdout);
1063                } else {
1064                        error("remote-curl: unknown command '%s' from git", buf.buf);
1065                        return 1;
1066                }
1067                strbuf_reset(&buf);
1068        } while (1);
1069
1070        http_cleanup();
1071
1072        return 0;
1073}