Andrew's git / gitweb.git / remote-curl.c
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remote-curl.con commit doc: rewrite description for rev-parse --short (fb87327)
   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        char *deepen_since;
  24        struct string_list deepen_not;
  25        struct string_list push_options;
  26        unsigned progress : 1,
  27                check_self_contained_and_connected : 1,
  28                cloning : 1,
  29                update_shallow : 1,
  30                followtags : 1,
  31                dry_run : 1,
  32                thin : 1,
  33                /* One of the SEND_PACK_PUSH_CERT_* constants. */
  34                push_cert : 2,
  35                deepen_relative : 1;
  36};
  37static struct options options;
  38static struct string_list cas_options = STRING_LIST_INIT_DUP;
  39
  40static int set_option(const char *name, const char *value)
  41{
  42        if (!strcmp(name, "verbosity")) {
  43                char *end;
  44                int v = strtol(value, &end, 10);
  45                if (value == end || *end)
  46                        return -1;
  47                options.verbosity = v;
  48                return 0;
  49        }
  50        else if (!strcmp(name, "progress")) {
  51                if (!strcmp(value, "true"))
  52                        options.progress = 1;
  53                else if (!strcmp(value, "false"))
  54                        options.progress = 0;
  55                else
  56                        return -1;
  57                return 0;
  58        }
  59        else if (!strcmp(name, "depth")) {
  60                char *end;
  61                unsigned long v = strtoul(value, &end, 10);
  62                if (value == end || *end)
  63                        return -1;
  64                options.depth = v;
  65                return 0;
  66        }
  67        else if (!strcmp(name, "deepen-since")) {
  68                options.deepen_since = xstrdup(value);
  69                return 0;
  70        }
  71        else if (!strcmp(name, "deepen-not")) {
  72                string_list_append(&options.deepen_not, value);
  73                return 0;
  74        }
  75        else if (!strcmp(name, "deepen-relative")) {
  76                if (!strcmp(value, "true"))
  77                        options.deepen_relative = 1;
  78                else if (!strcmp(value, "false"))
  79                        options.deepen_relative = 0;
  80                else
  81                        return -1;
  82                return 0;
  83        }
  84        else if (!strcmp(name, "followtags")) {
  85                if (!strcmp(value, "true"))
  86                        options.followtags = 1;
  87                else if (!strcmp(value, "false"))
  88                        options.followtags = 0;
  89                else
  90                        return -1;
  91                return 0;
  92        }
  93        else if (!strcmp(name, "dry-run")) {
  94                if (!strcmp(value, "true"))
  95                        options.dry_run = 1;
  96                else if (!strcmp(value, "false"))
  97                        options.dry_run = 0;
  98                else
  99                        return -1;
 100                return 0;
 101        }
 102        else if (!strcmp(name, "check-connectivity")) {
 103                if (!strcmp(value, "true"))
 104                        options.check_self_contained_and_connected = 1;
 105                else if (!strcmp(value, "false"))
 106                        options.check_self_contained_and_connected = 0;
 107                else
 108                        return -1;
 109                return 0;
 110        }
 111        else if (!strcmp(name, "cas")) {
 112                struct strbuf val = STRBUF_INIT;
 113                strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
 114                string_list_append(&cas_options, val.buf);
 115                strbuf_release(&val);
 116                return 0;
 117        } else if (!strcmp(name, "cloning")) {
 118                if (!strcmp(value, "true"))
 119                        options.cloning = 1;
 120                else if (!strcmp(value, "false"))
 121                        options.cloning = 0;
 122                else
 123                        return -1;
 124                return 0;
 125        } else if (!strcmp(name, "update-shallow")) {
 126                if (!strcmp(value, "true"))
 127                        options.update_shallow = 1;
 128                else if (!strcmp(value, "false"))
 129                        options.update_shallow = 0;
 130                else
 131                        return -1;
 132                return 0;
 133        } else if (!strcmp(name, "pushcert")) {
 134                if (!strcmp(value, "true"))
 135                        options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 136                else if (!strcmp(value, "false"))
 137                        options.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 138                else if (!strcmp(value, "if-asked"))
 139                        options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 140                else
 141                        return -1;
 142                return 0;
 143        } else if (!strcmp(name, "push-option")) {
 144                string_list_append(&options.push_options, value);
 145                return 0;
 146
 147#if LIBCURL_VERSION_NUM >= 0x070a08
 148        } else if (!strcmp(name, "family")) {
 149                if (!strcmp(value, "ipv4"))
 150                        git_curl_ipresolve = CURL_IPRESOLVE_V4;
 151                else if (!strcmp(value, "ipv6"))
 152                        git_curl_ipresolve = CURL_IPRESOLVE_V6;
 153                else if (!strcmp(value, "all"))
 154                        git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
 155                else
 156                        return -1;
 157                return 0;
 158#endif /* LIBCURL_VERSION_NUM >= 0x070a08 */
 159        } else {
 160                return 1 /* unsupported */;
 161        }
 162}
 163
 164struct discovery {
 165        const char *service;
 166        char *buf_alloc;
 167        char *buf;
 168        size_t len;
 169        struct ref *refs;
 170        struct oid_array shallow;
 171        unsigned proto_git : 1;
 172};
 173static struct discovery *last_discovery;
 174
 175static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 176{
 177        struct ref *list = NULL;
 178        get_remote_heads(-1, heads->buf, heads->len, &list,
 179                         for_push ? REF_NORMAL : 0, NULL, &heads->shallow);
 180        return list;
 181}
 182
 183static struct ref *parse_info_refs(struct discovery *heads)
 184{
 185        char *data, *start, *mid;
 186        char *ref_name;
 187        int i = 0;
 188
 189        struct ref *refs = NULL;
 190        struct ref *ref = NULL;
 191        struct ref *last_ref = NULL;
 192
 193        data = heads->buf;
 194        start = NULL;
 195        mid = data;
 196        while (i < heads->len) {
 197                if (!start) {
 198                        start = &data[i];
 199                }
 200                if (data[i] == '\t')
 201                        mid = &data[i];
 202                if (data[i] == '\n') {
 203                        if (mid - start != 40)
 204                                die("%sinfo/refs not valid: is this a git repository?",
 205                                    url.buf);
 206                        data[i] = 0;
 207                        ref_name = mid + 1;
 208                        ref = alloc_ref(ref_name);
 209                        get_oid_hex(start, &ref->old_oid);
 210                        if (!refs)
 211                                refs = ref;
 212                        if (last_ref)
 213                                last_ref->next = ref;
 214                        last_ref = ref;
 215                        start = NULL;
 216                }
 217                i++;
 218        }
 219
 220        ref = alloc_ref("HEAD");
 221        if (!http_fetch_ref(url.buf, ref) &&
 222            !resolve_remote_symref(ref, refs)) {
 223                ref->next = refs;
 224                refs = ref;
 225        } else {
 226                free(ref);
 227        }
 228
 229        return refs;
 230}
 231
 232static void free_discovery(struct discovery *d)
 233{
 234        if (d) {
 235                if (d == last_discovery)
 236                        last_discovery = NULL;
 237                free(d->shallow.oid);
 238                free(d->buf_alloc);
 239                free_refs(d->refs);
 240                free(d);
 241        }
 242}
 243
 244static int show_http_message(struct strbuf *type, struct strbuf *charset,
 245                             struct strbuf *msg)
 246{
 247        const char *p, *eol;
 248
 249        /*
 250         * We only show text/plain parts, as other types are likely
 251         * to be ugly to look at on the user's terminal.
 252         */
 253        if (strcmp(type->buf, "text/plain"))
 254                return -1;
 255        if (charset->len)
 256                strbuf_reencode(msg, charset->buf, get_log_output_encoding());
 257
 258        strbuf_trim(msg);
 259        if (!msg->len)
 260                return -1;
 261
 262        p = msg->buf;
 263        do {
 264                eol = strchrnul(p, '\n');
 265                fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 266                p = eol + 1;
 267        } while(*eol);
 268        return 0;
 269}
 270
 271static struct discovery *discover_refs(const char *service, int for_push)
 272{
 273        struct strbuf exp = STRBUF_INIT;
 274        struct strbuf type = STRBUF_INIT;
 275        struct strbuf charset = STRBUF_INIT;
 276        struct strbuf buffer = STRBUF_INIT;
 277        struct strbuf refs_url = STRBUF_INIT;
 278        struct strbuf effective_url = STRBUF_INIT;
 279        struct discovery *last = last_discovery;
 280        int http_ret, maybe_smart = 0;
 281        struct http_get_options http_options;
 282
 283        if (last && !strcmp(service, last->service))
 284                return last;
 285        free_discovery(last);
 286
 287        strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 288        if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 289             git_env_bool("GIT_SMART_HTTP", 1)) {
 290                maybe_smart = 1;
 291                if (!strchr(url.buf, '?'))
 292                        strbuf_addch(&refs_url, '?');
 293                else
 294                        strbuf_addch(&refs_url, '&');
 295                strbuf_addf(&refs_url, "service=%s", service);
 296        }
 297
 298        memset(&http_options, 0, sizeof(http_options));
 299        http_options.content_type = &type;
 300        http_options.charset = &charset;
 301        http_options.effective_url = &effective_url;
 302        http_options.base_url = &url;
 303        http_options.initial_request = 1;
 304        http_options.no_cache = 1;
 305        http_options.keep_error = 1;
 306
 307        http_ret = http_get_strbuf(refs_url.buf, &buffer, &http_options);
 308        switch (http_ret) {
 309        case HTTP_OK:
 310                break;
 311        case HTTP_MISSING_TARGET:
 312                show_http_message(&type, &charset, &buffer);
 313                die("repository '%s' not found", url.buf);
 314        case HTTP_NOAUTH:
 315                show_http_message(&type, &charset, &buffer);
 316                die("Authentication failed for '%s'", url.buf);
 317        default:
 318                show_http_message(&type, &charset, &buffer);
 319                die("unable to access '%s': %s", url.buf, curl_errorstr);
 320        }
 321
 322        if (options.verbosity && !starts_with(refs_url.buf, url.buf))
 323                warning(_("redirecting to %s"), url.buf);
 324
 325        last= xcalloc(1, sizeof(*last_discovery));
 326        last->service = service;
 327        last->buf_alloc = strbuf_detach(&buffer, &last->len);
 328        last->buf = last->buf_alloc;
 329
 330        strbuf_addf(&exp, "application/x-%s-advertisement", service);
 331        if (maybe_smart &&
 332            (5 <= last->len && last->buf[4] == '#') &&
 333            !strbuf_cmp(&exp, &type)) {
 334                char *line;
 335
 336                /*
 337                 * smart HTTP response; validate that the service
 338                 * pkt-line matches our request.
 339                 */
 340                line = packet_read_line_buf(&last->buf, &last->len, NULL);
 341
 342                strbuf_reset(&exp);
 343                strbuf_addf(&exp, "# service=%s", service);
 344                if (strcmp(line, exp.buf))
 345                        die("invalid server response; got '%s'", line);
 346                strbuf_release(&exp);
 347
 348                /* The header can include additional metadata lines, up
 349                 * until a packet flush marker.  Ignore these now, but
 350                 * in the future we might start to scan them.
 351                 */
 352                while (packet_read_line_buf(&last->buf, &last->len, NULL))
 353                        ;
 354
 355                last->proto_git = 1;
 356        }
 357
 358        if (last->proto_git)
 359                last->refs = parse_git_refs(last, for_push);
 360        else
 361                last->refs = parse_info_refs(last);
 362
 363        strbuf_release(&refs_url);
 364        strbuf_release(&exp);
 365        strbuf_release(&type);
 366        strbuf_release(&charset);
 367        strbuf_release(&effective_url);
 368        strbuf_release(&buffer);
 369        last_discovery = last;
 370        return last;
 371}
 372
 373static struct ref *get_refs(int for_push)
 374{
 375        struct discovery *heads;
 376
 377        if (for_push)
 378                heads = discover_refs("git-receive-pack", for_push);
 379        else
 380                heads = discover_refs("git-upload-pack", for_push);
 381
 382        return heads->refs;
 383}
 384
 385static void output_refs(struct ref *refs)
 386{
 387        struct ref *posn;
 388        for (posn = refs; posn; posn = posn->next) {
 389                if (posn->symref)
 390                        printf("@%s %s\n", posn->symref, posn->name);
 391                else
 392                        printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name);
 393        }
 394        printf("\n");
 395        fflush(stdout);
 396}
 397
 398struct rpc_state {
 399        const char *service_name;
 400        const char **argv;
 401        struct strbuf *stdin_preamble;
 402        char *service_url;
 403        char *hdr_content_type;
 404        char *hdr_accept;
 405        char *buf;
 406        size_t alloc;
 407        size_t len;
 408        size_t pos;
 409        int in;
 410        int out;
 411        int any_written;
 412        struct strbuf result;
 413        unsigned gzip_request : 1;
 414        unsigned initial_buffer : 1;
 415};
 416
 417static size_t rpc_out(void *ptr, size_t eltsize,
 418                size_t nmemb, void *buffer_)
 419{
 420        size_t max = eltsize * nmemb;
 421        struct rpc_state *rpc = buffer_;
 422        size_t avail = rpc->len - rpc->pos;
 423
 424        if (!avail) {
 425                rpc->initial_buffer = 0;
 426                avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 427                if (!avail)
 428                        return 0;
 429                rpc->pos = 0;
 430                rpc->len = avail;
 431        }
 432
 433        if (max < avail)
 434                avail = max;
 435        memcpy(ptr, rpc->buf + rpc->pos, avail);
 436        rpc->pos += avail;
 437        return avail;
 438}
 439
 440#ifndef NO_CURL_IOCTL
 441static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 442{
 443        struct rpc_state *rpc = clientp;
 444
 445        switch (cmd) {
 446        case CURLIOCMD_NOP:
 447                return CURLIOE_OK;
 448
 449        case CURLIOCMD_RESTARTREAD:
 450                if (rpc->initial_buffer) {
 451                        rpc->pos = 0;
 452                        return CURLIOE_OK;
 453                }
 454                error("unable to rewind rpc post data - try increasing http.postBuffer");
 455                return CURLIOE_FAILRESTART;
 456
 457        default:
 458                return CURLIOE_UNKNOWNCMD;
 459        }
 460}
 461#endif
 462
 463static size_t rpc_in(char *ptr, size_t eltsize,
 464                size_t nmemb, void *buffer_)
 465{
 466        size_t size = eltsize * nmemb;
 467        struct rpc_state *rpc = buffer_;
 468        if (size)
 469                rpc->any_written = 1;
 470        write_or_die(rpc->in, ptr, size);
 471        return size;
 472}
 473
 474static int run_slot(struct active_request_slot *slot,
 475                    struct slot_results *results)
 476{
 477        int err;
 478        struct slot_results results_buf;
 479
 480        if (!results)
 481                results = &results_buf;
 482
 483        err = run_one_slot(slot, results);
 484
 485        if (err != HTTP_OK && err != HTTP_REAUTH) {
 486                struct strbuf msg = STRBUF_INIT;
 487                if (results->http_code && results->http_code != 200)
 488                        strbuf_addf(&msg, "HTTP %ld", results->http_code);
 489                if (results->curl_result != CURLE_OK) {
 490                        if (msg.len)
 491                                strbuf_addch(&msg, ' ');
 492                        strbuf_addf(&msg, "curl %d", results->curl_result);
 493                        if (curl_errorstr[0]) {
 494                                strbuf_addch(&msg, ' ');
 495                                strbuf_addstr(&msg, curl_errorstr);
 496                        }
 497                }
 498                error("RPC failed; %s", msg.buf);
 499                strbuf_release(&msg);
 500        }
 501
 502        return err;
 503}
 504
 505static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 506{
 507        struct active_request_slot *slot;
 508        struct curl_slist *headers = http_copy_default_headers();
 509        struct strbuf buf = STRBUF_INIT;
 510        int err;
 511
 512        slot = get_active_slot();
 513
 514        headers = curl_slist_append(headers, rpc->hdr_content_type);
 515        headers = curl_slist_append(headers, rpc->hdr_accept);
 516
 517        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 518        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 519        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 520        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 521        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 522        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 523        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 524        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 525        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 526
 527        err = run_slot(slot, results);
 528
 529        curl_slist_free_all(headers);
 530        strbuf_release(&buf);
 531        return err;
 532}
 533
 534static curl_off_t xcurl_off_t(ssize_t len) {
 535        if (len > maximum_signed_value_of_type(curl_off_t))
 536                die("cannot handle pushes this big");
 537        return (curl_off_t) len;
 538}
 539
 540static int post_rpc(struct rpc_state *rpc)
 541{
 542        struct active_request_slot *slot;
 543        struct curl_slist *headers = http_copy_default_headers();
 544        int use_gzip = rpc->gzip_request;
 545        char *gzip_body = NULL;
 546        size_t gzip_size = 0;
 547        int err, large_request = 0;
 548        int needs_100_continue = 0;
 549
 550        /* Try to load the entire request, if we can fit it into the
 551         * allocated buffer space we can use HTTP/1.0 and avoid the
 552         * chunked encoding mess.
 553         */
 554        while (1) {
 555                size_t left = rpc->alloc - rpc->len;
 556                char *buf = rpc->buf + rpc->len;
 557                int n;
 558
 559                if (left < LARGE_PACKET_MAX) {
 560                        large_request = 1;
 561                        use_gzip = 0;
 562                        break;
 563                }
 564
 565                n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 566                if (!n)
 567                        break;
 568                rpc->len += n;
 569        }
 570
 571        if (large_request) {
 572                struct slot_results results;
 573
 574                do {
 575                        err = probe_rpc(rpc, &results);
 576                        if (err == HTTP_REAUTH)
 577                                credential_fill(&http_auth);
 578                } while (err == HTTP_REAUTH);
 579                if (err != HTTP_OK)
 580                        return -1;
 581
 582                if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 583                        needs_100_continue = 1;
 584        }
 585
 586        headers = curl_slist_append(headers, rpc->hdr_content_type);
 587        headers = curl_slist_append(headers, rpc->hdr_accept);
 588        headers = curl_slist_append(headers, needs_100_continue ?
 589                "Expect: 100-continue" : "Expect:");
 590
 591retry:
 592        slot = get_active_slot();
 593
 594        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 595        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 596        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 597        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 598
 599        if (large_request) {
 600                /* The request body is large and the size cannot be predicted.
 601                 * We must use chunked encoding to send it.
 602                 */
 603                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 604                rpc->initial_buffer = 1;
 605                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 606                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 607#ifndef NO_CURL_IOCTL
 608                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 609                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 610#endif
 611                if (options.verbosity > 1) {
 612                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 613                        fflush(stderr);
 614                }
 615
 616        } else if (gzip_body) {
 617                /*
 618                 * If we are looping to retry authentication, then the previous
 619                 * run will have set up the headers and gzip buffer already,
 620                 * and we just need to send it.
 621                 */
 622                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 623                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 624
 625        } else if (use_gzip && 1024 < rpc->len) {
 626                /* The client backend isn't giving us compressed data so
 627                 * we can try to deflate it ourselves, this may save on.
 628                 * the transfer time.
 629                 */
 630                git_zstream stream;
 631                int ret;
 632
 633                git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 634                gzip_size = git_deflate_bound(&stream, rpc->len);
 635                gzip_body = xmalloc(gzip_size);
 636
 637                stream.next_in = (unsigned char *)rpc->buf;
 638                stream.avail_in = rpc->len;
 639                stream.next_out = (unsigned char *)gzip_body;
 640                stream.avail_out = gzip_size;
 641
 642                ret = git_deflate(&stream, Z_FINISH);
 643                if (ret != Z_STREAM_END)
 644                        die("cannot deflate request; zlib deflate error %d", ret);
 645
 646                ret = git_deflate_end_gently(&stream);
 647                if (ret != Z_OK)
 648                        die("cannot deflate request; zlib end error %d", ret);
 649
 650                gzip_size = stream.total_out;
 651
 652                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 653                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 654                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(gzip_size));
 655
 656                if (options.verbosity > 1) {
 657                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 658                                rpc->service_name,
 659                                (unsigned long)rpc->len, (unsigned long)gzip_size);
 660                        fflush(stderr);
 661                }
 662        } else {
 663                /* We know the complete request size in advance, use the
 664                 * more normal Content-Length approach.
 665                 */
 666                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 667                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE_LARGE, xcurl_off_t(rpc->len));
 668                if (options.verbosity > 1) {
 669                        fprintf(stderr, "POST %s (%lu bytes)\n",
 670                                rpc->service_name, (unsigned long)rpc->len);
 671                        fflush(stderr);
 672                }
 673        }
 674
 675        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 676        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 677        curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 678
 679
 680        rpc->any_written = 0;
 681        err = run_slot(slot, NULL);
 682        if (err == HTTP_REAUTH && !large_request) {
 683                credential_fill(&http_auth);
 684                goto retry;
 685        }
 686        if (err != HTTP_OK)
 687                err = -1;
 688
 689        if (!rpc->any_written)
 690                err = -1;
 691
 692        curl_slist_free_all(headers);
 693        free(gzip_body);
 694        return err;
 695}
 696
 697static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 698{
 699        const char *svc = rpc->service_name;
 700        struct strbuf buf = STRBUF_INIT;
 701        struct strbuf *preamble = rpc->stdin_preamble;
 702        struct child_process client = CHILD_PROCESS_INIT;
 703        int err = 0;
 704
 705        client.in = -1;
 706        client.out = -1;
 707        client.git_cmd = 1;
 708        client.argv = rpc->argv;
 709        if (start_command(&client))
 710                exit(1);
 711        if (preamble)
 712                write_or_die(client.in, preamble->buf, preamble->len);
 713        if (heads)
 714                write_or_die(client.in, heads->buf, heads->len);
 715
 716        rpc->alloc = http_post_buffer;
 717        rpc->buf = xmalloc(rpc->alloc);
 718        rpc->in = client.in;
 719        rpc->out = client.out;
 720        strbuf_init(&rpc->result, 0);
 721
 722        strbuf_addf(&buf, "%s%s", url.buf, svc);
 723        rpc->service_url = strbuf_detach(&buf, NULL);
 724
 725        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 726        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 727
 728        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 729        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 730
 731        while (!err) {
 732                int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 733                if (!n)
 734                        break;
 735                rpc->pos = 0;
 736                rpc->len = n;
 737                err |= post_rpc(rpc);
 738        }
 739
 740        close(client.in);
 741        client.in = -1;
 742        if (!err) {
 743                strbuf_read(&rpc->result, client.out, 0);
 744        } else {
 745                char buf[4096];
 746                for (;;)
 747                        if (xread(client.out, buf, sizeof(buf)) <= 0)
 748                                break;
 749        }
 750
 751        close(client.out);
 752        client.out = -1;
 753
 754        err |= finish_command(&client);
 755        free(rpc->service_url);
 756        free(rpc->hdr_content_type);
 757        free(rpc->hdr_accept);
 758        free(rpc->buf);
 759        strbuf_release(&buf);
 760        return err;
 761}
 762
 763static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 764{
 765        struct walker *walker;
 766        char **targets;
 767        int ret, i;
 768
 769        ALLOC_ARRAY(targets, nr_heads);
 770        if (options.depth || options.deepen_since)
 771                die("dumb http transport does not support shallow capabilities");
 772        for (i = 0; i < nr_heads; i++)
 773                targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
 774
 775        walker = get_http_walker(url.buf);
 776        walker->get_all = 1;
 777        walker->get_tree = 1;
 778        walker->get_history = 1;
 779        walker->get_verbosely = options.verbosity >= 3;
 780        walker->get_recover = 0;
 781        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 782        walker_free(walker);
 783
 784        for (i = 0; i < nr_heads; i++)
 785                free(targets[i]);
 786        free(targets);
 787
 788        return ret ? error("fetch failed.") : 0;
 789}
 790
 791static int fetch_git(struct discovery *heads,
 792        int nr_heads, struct ref **to_fetch)
 793{
 794        struct rpc_state rpc;
 795        struct strbuf preamble = STRBUF_INIT;
 796        int i, err;
 797        struct argv_array args = ARGV_ARRAY_INIT;
 798
 799        argv_array_pushl(&args, "fetch-pack", "--stateless-rpc",
 800                         "--stdin", "--lock-pack", NULL);
 801        if (options.followtags)
 802                argv_array_push(&args, "--include-tag");
 803        if (options.thin)
 804                argv_array_push(&args, "--thin");
 805        if (options.verbosity >= 3)
 806                argv_array_pushl(&args, "-v", "-v", NULL);
 807        if (options.check_self_contained_and_connected)
 808                argv_array_push(&args, "--check-self-contained-and-connected");
 809        if (options.cloning)
 810                argv_array_push(&args, "--cloning");
 811        if (options.update_shallow)
 812                argv_array_push(&args, "--update-shallow");
 813        if (!options.progress)
 814                argv_array_push(&args, "--no-progress");
 815        if (options.depth)
 816                argv_array_pushf(&args, "--depth=%lu", options.depth);
 817        if (options.deepen_since)
 818                argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since);
 819        for (i = 0; i < options.deepen_not.nr; i++)
 820                argv_array_pushf(&args, "--shallow-exclude=%s",
 821                                 options.deepen_not.items[i].string);
 822        if (options.deepen_relative && options.depth)
 823                argv_array_push(&args, "--deepen-relative");
 824        argv_array_push(&args, url.buf);
 825
 826        for (i = 0; i < nr_heads; i++) {
 827                struct ref *ref = to_fetch[i];
 828                if (!*ref->name)
 829                        die("cannot fetch by sha1 over smart http");
 830                packet_buf_write(&preamble, "%s %s\n",
 831                                 oid_to_hex(&ref->old_oid), ref->name);
 832        }
 833        packet_buf_flush(&preamble);
 834
 835        memset(&rpc, 0, sizeof(rpc));
 836        rpc.service_name = "git-upload-pack",
 837        rpc.argv = args.argv;
 838        rpc.stdin_preamble = &preamble;
 839        rpc.gzip_request = 1;
 840
 841        err = rpc_service(&rpc, heads);
 842        if (rpc.result.len)
 843                write_or_die(1, rpc.result.buf, rpc.result.len);
 844        strbuf_release(&rpc.result);
 845        strbuf_release(&preamble);
 846        argv_array_clear(&args);
 847        return err;
 848}
 849
 850static int fetch(int nr_heads, struct ref **to_fetch)
 851{
 852        struct discovery *d = discover_refs("git-upload-pack", 0);
 853        if (d->proto_git)
 854                return fetch_git(d, nr_heads, to_fetch);
 855        else
 856                return fetch_dumb(nr_heads, to_fetch);
 857}
 858
 859static void parse_fetch(struct strbuf *buf)
 860{
 861        struct ref **to_fetch = NULL;
 862        struct ref *list_head = NULL;
 863        struct ref **list = &list_head;
 864        int alloc_heads = 0, nr_heads = 0;
 865
 866        do {
 867                const char *p;
 868                if (skip_prefix(buf->buf, "fetch ", &p)) {
 869                        const char *name;
 870                        struct ref *ref;
 871                        struct object_id old_oid;
 872
 873                        if (get_oid_hex(p, &old_oid))
 874                                die("protocol error: expected sha/ref, got %s'", p);
 875                        if (p[GIT_SHA1_HEXSZ] == ' ')
 876                                name = p + GIT_SHA1_HEXSZ + 1;
 877                        else if (!p[GIT_SHA1_HEXSZ])
 878                                name = "";
 879                        else
 880                                die("protocol error: expected sha/ref, got %s'", p);
 881
 882                        ref = alloc_ref(name);
 883                        oidcpy(&ref->old_oid, &old_oid);
 884
 885                        *list = ref;
 886                        list = &ref->next;
 887
 888                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 889                        to_fetch[nr_heads++] = ref;
 890                }
 891                else
 892                        die("http transport does not support %s", buf->buf);
 893
 894                strbuf_reset(buf);
 895                if (strbuf_getline_lf(buf, stdin) == EOF)
 896                        return;
 897                if (!*buf->buf)
 898                        break;
 899        } while (1);
 900
 901        if (fetch(nr_heads, to_fetch))
 902                exit(128); /* error already reported */
 903        free_refs(list_head);
 904        free(to_fetch);
 905
 906        printf("\n");
 907        fflush(stdout);
 908        strbuf_reset(buf);
 909}
 910
 911static int push_dav(int nr_spec, char **specs)
 912{
 913        struct child_process child = CHILD_PROCESS_INIT;
 914        size_t i;
 915
 916        child.git_cmd = 1;
 917        argv_array_push(&child.args, "http-push");
 918        argv_array_push(&child.args, "--helper-status");
 919        if (options.dry_run)
 920                argv_array_push(&child.args, "--dry-run");
 921        if (options.verbosity > 1)
 922                argv_array_push(&child.args, "--verbose");
 923        argv_array_push(&child.args, url.buf);
 924        for (i = 0; i < nr_spec; i++)
 925                argv_array_push(&child.args, specs[i]);
 926
 927        if (run_command(&child))
 928                die("git-http-push failed");
 929        return 0;
 930}
 931
 932static int push_git(struct discovery *heads, int nr_spec, char **specs)
 933{
 934        struct rpc_state rpc;
 935        int i, err;
 936        struct argv_array args;
 937        struct string_list_item *cas_option;
 938        struct strbuf preamble = STRBUF_INIT;
 939
 940        argv_array_init(&args);
 941        argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 942                         NULL);
 943
 944        if (options.thin)
 945                argv_array_push(&args, "--thin");
 946        if (options.dry_run)
 947                argv_array_push(&args, "--dry-run");
 948        if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
 949                argv_array_push(&args, "--signed=yes");
 950        else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
 951                argv_array_push(&args, "--signed=if-asked");
 952        if (options.verbosity == 0)
 953                argv_array_push(&args, "--quiet");
 954        else if (options.verbosity > 1)
 955                argv_array_push(&args, "--verbose");
 956        for (i = 0; i < options.push_options.nr; i++)
 957                argv_array_pushf(&args, "--push-option=%s",
 958                                 options.push_options.items[i].string);
 959        argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 960        for_each_string_list_item(cas_option, &cas_options)
 961                argv_array_push(&args, cas_option->string);
 962        argv_array_push(&args, url.buf);
 963
 964        argv_array_push(&args, "--stdin");
 965        for (i = 0; i < nr_spec; i++)
 966                packet_buf_write(&preamble, "%s\n", specs[i]);
 967        packet_buf_flush(&preamble);
 968
 969        memset(&rpc, 0, sizeof(rpc));
 970        rpc.service_name = "git-receive-pack",
 971        rpc.argv = args.argv;
 972        rpc.stdin_preamble = &preamble;
 973
 974        err = rpc_service(&rpc, heads);
 975        if (rpc.result.len)
 976                write_or_die(1, rpc.result.buf, rpc.result.len);
 977        strbuf_release(&rpc.result);
 978        strbuf_release(&preamble);
 979        argv_array_clear(&args);
 980        return err;
 981}
 982
 983static int push(int nr_spec, char **specs)
 984{
 985        struct discovery *heads = discover_refs("git-receive-pack", 1);
 986        int ret;
 987
 988        if (heads->proto_git)
 989                ret = push_git(heads, nr_spec, specs);
 990        else
 991                ret = push_dav(nr_spec, specs);
 992        free_discovery(heads);
 993        return ret;
 994}
 995
 996static void parse_push(struct strbuf *buf)
 997{
 998        char **specs = NULL;
 999        int alloc_spec = 0, nr_spec = 0, i, ret;
1000
1001        do {
1002                if (starts_with(buf->buf, "push ")) {
1003                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
1004                        specs[nr_spec++] = xstrdup(buf->buf + 5);
1005                }
1006                else
1007                        die("http transport does not support %s", buf->buf);
1008
1009                strbuf_reset(buf);
1010                if (strbuf_getline_lf(buf, stdin) == EOF)
1011                        goto free_specs;
1012                if (!*buf->buf)
1013                        break;
1014        } while (1);
1015
1016        ret = push(nr_spec, specs);
1017        printf("\n");
1018        fflush(stdout);
1019
1020        if (ret)
1021                exit(128); /* error already reported */
1022
1023 free_specs:
1024        for (i = 0; i < nr_spec; i++)
1025                free(specs[i]);
1026        free(specs);
1027}
1028
1029int cmd_main(int argc, const char **argv)
1030{
1031        struct strbuf buf = STRBUF_INIT;
1032        int nongit;
1033
1034        setup_git_directory_gently(&nongit);
1035        if (argc < 2) {
1036                error("remote-curl: usage: git remote-curl <remote> [<url>]");
1037                return 1;
1038        }
1039
1040        options.verbosity = 1;
1041        options.progress = !!isatty(2);
1042        options.thin = 1;
1043        string_list_init(&options.deepen_not, 1);
1044        string_list_init(&options.push_options, 1);
1045
1046        remote = remote_get(argv[1]);
1047
1048        if (argc > 2) {
1049                end_url_with_slash(&url, argv[2]);
1050        } else {
1051                end_url_with_slash(&url, remote->url[0]);
1052        }
1053
1054        http_init(remote, url.buf, 0);
1055
1056        do {
1057                const char *arg;
1058
1059                if (strbuf_getline_lf(&buf, stdin) == EOF) {
1060                        if (ferror(stdin))
1061                                error("remote-curl: error reading command stream from git");
1062                        return 1;
1063                }
1064                if (buf.len == 0)
1065                        break;
1066                if (starts_with(buf.buf, "fetch ")) {
1067                        if (nongit)
1068                                die("remote-curl: fetch attempted without a local repo");
1069                        parse_fetch(&buf);
1070
1071                } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1072                        int for_push = !!strstr(buf.buf + 4, "for-push");
1073                        output_refs(get_refs(for_push));
1074
1075                } else if (starts_with(buf.buf, "push ")) {
1076                        parse_push(&buf);
1077
1078                } else if (skip_prefix(buf.buf, "option ", &arg)) {
1079                        char *value = strchr(arg, ' ');
1080                        int result;
1081
1082                        if (value)
1083                                *value++ = '\0';
1084                        else
1085                                value = "true";
1086
1087                        result = set_option(arg, value);
1088                        if (!result)
1089                                printf("ok\n");
1090                        else if (result < 0)
1091                                printf("error invalid value\n");
1092                        else
1093                                printf("unsupported\n");
1094                        fflush(stdout);
1095
1096                } else if (!strcmp(buf.buf, "capabilities")) {
1097                        printf("fetch\n");
1098                        printf("option\n");
1099                        printf("push\n");
1100                        printf("check-connectivity\n");
1101                        printf("\n");
1102                        fflush(stdout);
1103                } else {
1104                        error("remote-curl: unknown command '%s' from git", buf.buf);
1105                        return 1;
1106                }
1107                strbuf_reset(&buf);
1108        } while (1);
1109
1110        http_cleanup();
1111
1112        return 0;
1113}