Andrew's git / gitweb.git / remote-curl.c
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remote-curl.con commit upload-pack: optionally allow fetching any sha1 (f8edeaa)
   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        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                deepen_relative : 1;
  35};
  36static struct options options;
  37static struct string_list cas_options = STRING_LIST_INIT_DUP;
  38
  39static int set_option(const char *name, const char *value)
  40{
  41        if (!strcmp(name, "verbosity")) {
  42                char *end;
  43                int v = strtol(value, &end, 10);
  44                if (value == end || *end)
  45                        return -1;
  46                options.verbosity = v;
  47                return 0;
  48        }
  49        else if (!strcmp(name, "progress")) {
  50                if (!strcmp(value, "true"))
  51                        options.progress = 1;
  52                else if (!strcmp(value, "false"))
  53                        options.progress = 0;
  54                else
  55                        return -1;
  56                return 0;
  57        }
  58        else if (!strcmp(name, "depth")) {
  59                char *end;
  60                unsigned long v = strtoul(value, &end, 10);
  61                if (value == end || *end)
  62                        return -1;
  63                options.depth = v;
  64                return 0;
  65        }
  66        else if (!strcmp(name, "deepen-since")) {
  67                options.deepen_since = xstrdup(value);
  68                return 0;
  69        }
  70        else if (!strcmp(name, "deepen-not")) {
  71                string_list_append(&options.deepen_not, value);
  72                return 0;
  73        }
  74        else if (!strcmp(name, "deepen-relative")) {
  75                if (!strcmp(value, "true"))
  76                        options.deepen_relative = 1;
  77                else if (!strcmp(value, "false"))
  78                        options.deepen_relative = 0;
  79                else
  80                        return -1;
  81                return 0;
  82        }
  83        else if (!strcmp(name, "followtags")) {
  84                if (!strcmp(value, "true"))
  85                        options.followtags = 1;
  86                else if (!strcmp(value, "false"))
  87                        options.followtags = 0;
  88                else
  89                        return -1;
  90                return 0;
  91        }
  92        else if (!strcmp(name, "dry-run")) {
  93                if (!strcmp(value, "true"))
  94                        options.dry_run = 1;
  95                else if (!strcmp(value, "false"))
  96                        options.dry_run = 0;
  97                else
  98                        return -1;
  99                return 0;
 100        }
 101        else if (!strcmp(name, "check-connectivity")) {
 102                if (!strcmp(value, "true"))
 103                        options.check_self_contained_and_connected = 1;
 104                else if (!strcmp(value, "false"))
 105                        options.check_self_contained_and_connected = 0;
 106                else
 107                        return -1;
 108                return 0;
 109        }
 110        else if (!strcmp(name, "cas")) {
 111                struct strbuf val = STRBUF_INIT;
 112                strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
 113                string_list_append(&cas_options, val.buf);
 114                strbuf_release(&val);
 115                return 0;
 116        } else if (!strcmp(name, "cloning")) {
 117                if (!strcmp(value, "true"))
 118                        options.cloning = 1;
 119                else if (!strcmp(value, "false"))
 120                        options.cloning = 0;
 121                else
 122                        return -1;
 123                return 0;
 124        } else if (!strcmp(name, "update-shallow")) {
 125                if (!strcmp(value, "true"))
 126                        options.update_shallow = 1;
 127                else if (!strcmp(value, "false"))
 128                        options.update_shallow = 0;
 129                else
 130                        return -1;
 131                return 0;
 132        } else if (!strcmp(name, "pushcert")) {
 133                if (!strcmp(value, "true"))
 134                        options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 135                else if (!strcmp(value, "false"))
 136                        options.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 137                else if (!strcmp(value, "if-asked"))
 138                        options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 139                else
 140                        return -1;
 141                return 0;
 142
 143#if LIBCURL_VERSION_NUM >= 0x070a08
 144        } else if (!strcmp(name, "family")) {
 145                if (!strcmp(value, "ipv4"))
 146                        git_curl_ipresolve = CURL_IPRESOLVE_V4;
 147                else if (!strcmp(value, "ipv6"))
 148                        git_curl_ipresolve = CURL_IPRESOLVE_V6;
 149                else if (!strcmp(value, "all"))
 150                        git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
 151                else
 152                        return -1;
 153                return 0;
 154#endif /* LIBCURL_VERSION_NUM >= 0x070a08 */
 155        } else {
 156                return 1 /* unsupported */;
 157        }
 158}
 159
 160struct discovery {
 161        const char *service;
 162        char *buf_alloc;
 163        char *buf;
 164        size_t len;
 165        struct ref *refs;
 166        struct sha1_array shallow;
 167        unsigned proto_git : 1;
 168};
 169static struct discovery *last_discovery;
 170
 171static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 172{
 173        struct ref *list = NULL;
 174        get_remote_heads(-1, heads->buf, heads->len, &list,
 175                         for_push ? REF_NORMAL : 0, NULL, &heads->shallow);
 176        return list;
 177}
 178
 179static struct ref *parse_info_refs(struct discovery *heads)
 180{
 181        char *data, *start, *mid;
 182        char *ref_name;
 183        int i = 0;
 184
 185        struct ref *refs = NULL;
 186        struct ref *ref = NULL;
 187        struct ref *last_ref = NULL;
 188
 189        data = heads->buf;
 190        start = NULL;
 191        mid = data;
 192        while (i < heads->len) {
 193                if (!start) {
 194                        start = &data[i];
 195                }
 196                if (data[i] == '\t')
 197                        mid = &data[i];
 198                if (data[i] == '\n') {
 199                        if (mid - start != 40)
 200                                die("%sinfo/refs not valid: is this a git repository?",
 201                                    url.buf);
 202                        data[i] = 0;
 203                        ref_name = mid + 1;
 204                        ref = alloc_ref(ref_name);
 205                        get_oid_hex(start, &ref->old_oid);
 206                        if (!refs)
 207                                refs = ref;
 208                        if (last_ref)
 209                                last_ref->next = ref;
 210                        last_ref = ref;
 211                        start = NULL;
 212                }
 213                i++;
 214        }
 215
 216        ref = alloc_ref("HEAD");
 217        if (!http_fetch_ref(url.buf, ref) &&
 218            !resolve_remote_symref(ref, refs)) {
 219                ref->next = refs;
 220                refs = ref;
 221        } else {
 222                free(ref);
 223        }
 224
 225        return refs;
 226}
 227
 228static void free_discovery(struct discovery *d)
 229{
 230        if (d) {
 231                if (d == last_discovery)
 232                        last_discovery = NULL;
 233                free(d->shallow.sha1);
 234                free(d->buf_alloc);
 235                free_refs(d->refs);
 236                free(d);
 237        }
 238}
 239
 240static int show_http_message(struct strbuf *type, struct strbuf *charset,
 241                             struct strbuf *msg)
 242{
 243        const char *p, *eol;
 244
 245        /*
 246         * We only show text/plain parts, as other types are likely
 247         * to be ugly to look at on the user's terminal.
 248         */
 249        if (strcmp(type->buf, "text/plain"))
 250                return -1;
 251        if (charset->len)
 252                strbuf_reencode(msg, charset->buf, get_log_output_encoding());
 253
 254        strbuf_trim(msg);
 255        if (!msg->len)
 256                return -1;
 257
 258        p = msg->buf;
 259        do {
 260                eol = strchrnul(p, '\n');
 261                fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 262                p = eol + 1;
 263        } while(*eol);
 264        return 0;
 265}
 266
 267static struct discovery *discover_refs(const char *service, int for_push)
 268{
 269        struct strbuf exp = STRBUF_INIT;
 270        struct strbuf type = STRBUF_INIT;
 271        struct strbuf charset = STRBUF_INIT;
 272        struct strbuf buffer = STRBUF_INIT;
 273        struct strbuf refs_url = STRBUF_INIT;
 274        struct strbuf effective_url = STRBUF_INIT;
 275        struct discovery *last = last_discovery;
 276        int http_ret, maybe_smart = 0;
 277        struct http_get_options options;
 278
 279        if (last && !strcmp(service, last->service))
 280                return last;
 281        free_discovery(last);
 282
 283        strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 284        if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 285             git_env_bool("GIT_SMART_HTTP", 1)) {
 286                maybe_smart = 1;
 287                if (!strchr(url.buf, '?'))
 288                        strbuf_addch(&refs_url, '?');
 289                else
 290                        strbuf_addch(&refs_url, '&');
 291                strbuf_addf(&refs_url, "service=%s", service);
 292        }
 293
 294        memset(&options, 0, sizeof(options));
 295        options.content_type = &type;
 296        options.charset = &charset;
 297        options.effective_url = &effective_url;
 298        options.base_url = &url;
 299        options.no_cache = 1;
 300        options.keep_error = 1;
 301
 302        http_ret = http_get_strbuf(refs_url.buf, &buffer, &options);
 303        switch (http_ret) {
 304        case HTTP_OK:
 305                break;
 306        case HTTP_MISSING_TARGET:
 307                show_http_message(&type, &charset, &buffer);
 308                die("repository '%s' not found", url.buf);
 309        case HTTP_NOAUTH:
 310                show_http_message(&type, &charset, &buffer);
 311                die("Authentication failed for '%s'", url.buf);
 312        default:
 313                show_http_message(&type, &charset, &buffer);
 314                die("unable to access '%s': %s", url.buf, curl_errorstr);
 315        }
 316
 317        last= xcalloc(1, sizeof(*last_discovery));
 318        last->service = service;
 319        last->buf_alloc = strbuf_detach(&buffer, &last->len);
 320        last->buf = last->buf_alloc;
 321
 322        strbuf_addf(&exp, "application/x-%s-advertisement", service);
 323        if (maybe_smart &&
 324            (5 <= last->len && last->buf[4] == '#') &&
 325            !strbuf_cmp(&exp, &type)) {
 326                char *line;
 327
 328                /*
 329                 * smart HTTP response; validate that the service
 330                 * pkt-line matches our request.
 331                 */
 332                line = packet_read_line_buf(&last->buf, &last->len, NULL);
 333
 334                strbuf_reset(&exp);
 335                strbuf_addf(&exp, "# service=%s", service);
 336                if (strcmp(line, exp.buf))
 337                        die("invalid server response; got '%s'", line);
 338                strbuf_release(&exp);
 339
 340                /* The header can include additional metadata lines, up
 341                 * until a packet flush marker.  Ignore these now, but
 342                 * in the future we might start to scan them.
 343                 */
 344                while (packet_read_line_buf(&last->buf, &last->len, NULL))
 345                        ;
 346
 347                last->proto_git = 1;
 348        }
 349
 350        if (last->proto_git)
 351                last->refs = parse_git_refs(last, for_push);
 352        else
 353                last->refs = parse_info_refs(last);
 354
 355        strbuf_release(&refs_url);
 356        strbuf_release(&exp);
 357        strbuf_release(&type);
 358        strbuf_release(&charset);
 359        strbuf_release(&effective_url);
 360        strbuf_release(&buffer);
 361        last_discovery = last;
 362        return last;
 363}
 364
 365static struct ref *get_refs(int for_push)
 366{
 367        struct discovery *heads;
 368
 369        if (for_push)
 370                heads = discover_refs("git-receive-pack", for_push);
 371        else
 372                heads = discover_refs("git-upload-pack", for_push);
 373
 374        return heads->refs;
 375}
 376
 377static void output_refs(struct ref *refs)
 378{
 379        struct ref *posn;
 380        for (posn = refs; posn; posn = posn->next) {
 381                if (posn->symref)
 382                        printf("@%s %s\n", posn->symref, posn->name);
 383                else
 384                        printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name);
 385        }
 386        printf("\n");
 387        fflush(stdout);
 388}
 389
 390struct rpc_state {
 391        const char *service_name;
 392        const char **argv;
 393        struct strbuf *stdin_preamble;
 394        char *service_url;
 395        char *hdr_content_type;
 396        char *hdr_accept;
 397        char *buf;
 398        size_t alloc;
 399        size_t len;
 400        size_t pos;
 401        int in;
 402        int out;
 403        int any_written;
 404        struct strbuf result;
 405        unsigned gzip_request : 1;
 406        unsigned initial_buffer : 1;
 407};
 408
 409static size_t rpc_out(void *ptr, size_t eltsize,
 410                size_t nmemb, void *buffer_)
 411{
 412        size_t max = eltsize * nmemb;
 413        struct rpc_state *rpc = buffer_;
 414        size_t avail = rpc->len - rpc->pos;
 415
 416        if (!avail) {
 417                rpc->initial_buffer = 0;
 418                avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 419                if (!avail)
 420                        return 0;
 421                rpc->pos = 0;
 422                rpc->len = avail;
 423        }
 424
 425        if (max < avail)
 426                avail = max;
 427        memcpy(ptr, rpc->buf + rpc->pos, avail);
 428        rpc->pos += avail;
 429        return avail;
 430}
 431
 432#ifndef NO_CURL_IOCTL
 433static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 434{
 435        struct rpc_state *rpc = clientp;
 436
 437        switch (cmd) {
 438        case CURLIOCMD_NOP:
 439                return CURLIOE_OK;
 440
 441        case CURLIOCMD_RESTARTREAD:
 442                if (rpc->initial_buffer) {
 443                        rpc->pos = 0;
 444                        return CURLIOE_OK;
 445                }
 446                error("unable to rewind rpc post data - try increasing http.postBuffer");
 447                return CURLIOE_FAILRESTART;
 448
 449        default:
 450                return CURLIOE_UNKNOWNCMD;
 451        }
 452}
 453#endif
 454
 455static size_t rpc_in(char *ptr, size_t eltsize,
 456                size_t nmemb, void *buffer_)
 457{
 458        size_t size = eltsize * nmemb;
 459        struct rpc_state *rpc = buffer_;
 460        if (size)
 461                rpc->any_written = 1;
 462        write_or_die(rpc->in, ptr, size);
 463        return size;
 464}
 465
 466static int run_slot(struct active_request_slot *slot,
 467                    struct slot_results *results)
 468{
 469        int err;
 470        struct slot_results results_buf;
 471
 472        if (!results)
 473                results = &results_buf;
 474
 475        err = run_one_slot(slot, results);
 476
 477        if (err != HTTP_OK && err != HTTP_REAUTH) {
 478                struct strbuf msg = STRBUF_INIT;
 479                if (results->http_code && results->http_code != 200)
 480                        strbuf_addf(&msg, "HTTP %ld", results->http_code);
 481                if (results->curl_result != CURLE_OK) {
 482                        if (msg.len)
 483                                strbuf_addch(&msg, ' ');
 484                        strbuf_addf(&msg, "curl %d", results->curl_result);
 485                        if (curl_errorstr[0]) {
 486                                strbuf_addch(&msg, ' ');
 487                                strbuf_addstr(&msg, curl_errorstr);
 488                        }
 489                }
 490                error("RPC failed; %s", msg.buf);
 491                strbuf_release(&msg);
 492        }
 493
 494        return err;
 495}
 496
 497static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 498{
 499        struct active_request_slot *slot;
 500        struct curl_slist *headers = http_copy_default_headers();
 501        struct strbuf buf = STRBUF_INIT;
 502        int err;
 503
 504        slot = get_active_slot();
 505
 506        headers = curl_slist_append(headers, rpc->hdr_content_type);
 507        headers = curl_slist_append(headers, rpc->hdr_accept);
 508
 509        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 510        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 511        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 512        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 513        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 514        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 515        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 516        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 517        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 518
 519        err = run_slot(slot, results);
 520
 521        curl_slist_free_all(headers);
 522        strbuf_release(&buf);
 523        return err;
 524}
 525
 526static int post_rpc(struct rpc_state *rpc)
 527{
 528        struct active_request_slot *slot;
 529        struct curl_slist *headers = http_copy_default_headers();
 530        int use_gzip = rpc->gzip_request;
 531        char *gzip_body = NULL;
 532        size_t gzip_size = 0;
 533        int err, large_request = 0;
 534        int needs_100_continue = 0;
 535
 536        /* Try to load the entire request, if we can fit it into the
 537         * allocated buffer space we can use HTTP/1.0 and avoid the
 538         * chunked encoding mess.
 539         */
 540        while (1) {
 541                size_t left = rpc->alloc - rpc->len;
 542                char *buf = rpc->buf + rpc->len;
 543                int n;
 544
 545                if (left < LARGE_PACKET_MAX) {
 546                        large_request = 1;
 547                        use_gzip = 0;
 548                        break;
 549                }
 550
 551                n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 552                if (!n)
 553                        break;
 554                rpc->len += n;
 555        }
 556
 557        if (large_request) {
 558                struct slot_results results;
 559
 560                do {
 561                        err = probe_rpc(rpc, &results);
 562                        if (err == HTTP_REAUTH)
 563                                credential_fill(&http_auth);
 564                } while (err == HTTP_REAUTH);
 565                if (err != HTTP_OK)
 566                        return -1;
 567
 568                if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 569                        needs_100_continue = 1;
 570        }
 571
 572        headers = curl_slist_append(headers, rpc->hdr_content_type);
 573        headers = curl_slist_append(headers, rpc->hdr_accept);
 574        headers = curl_slist_append(headers, needs_100_continue ?
 575                "Expect: 100-continue" : "Expect:");
 576
 577retry:
 578        slot = get_active_slot();
 579
 580        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 581        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 582        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 583        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 584
 585        if (large_request) {
 586                /* The request body is large and the size cannot be predicted.
 587                 * We must use chunked encoding to send it.
 588                 */
 589                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 590                rpc->initial_buffer = 1;
 591                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 592                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 593#ifndef NO_CURL_IOCTL
 594                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 595                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 596#endif
 597                if (options.verbosity > 1) {
 598                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 599                        fflush(stderr);
 600                }
 601
 602        } else if (gzip_body) {
 603                /*
 604                 * If we are looping to retry authentication, then the previous
 605                 * run will have set up the headers and gzip buffer already,
 606                 * and we just need to send it.
 607                 */
 608                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 609                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 610
 611        } else if (use_gzip && 1024 < rpc->len) {
 612                /* The client backend isn't giving us compressed data so
 613                 * we can try to deflate it ourselves, this may save on.
 614                 * the transfer time.
 615                 */
 616                git_zstream stream;
 617                int ret;
 618
 619                git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 620                gzip_size = git_deflate_bound(&stream, rpc->len);
 621                gzip_body = xmalloc(gzip_size);
 622
 623                stream.next_in = (unsigned char *)rpc->buf;
 624                stream.avail_in = rpc->len;
 625                stream.next_out = (unsigned char *)gzip_body;
 626                stream.avail_out = gzip_size;
 627
 628                ret = git_deflate(&stream, Z_FINISH);
 629                if (ret != Z_STREAM_END)
 630                        die("cannot deflate request; zlib deflate error %d", ret);
 631
 632                ret = git_deflate_end_gently(&stream);
 633                if (ret != Z_OK)
 634                        die("cannot deflate request; zlib end error %d", ret);
 635
 636                gzip_size = stream.total_out;
 637
 638                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 639                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 640                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 641
 642                if (options.verbosity > 1) {
 643                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 644                                rpc->service_name,
 645                                (unsigned long)rpc->len, (unsigned long)gzip_size);
 646                        fflush(stderr);
 647                }
 648        } else {
 649                /* We know the complete request size in advance, use the
 650                 * more normal Content-Length approach.
 651                 */
 652                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 653                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 654                if (options.verbosity > 1) {
 655                        fprintf(stderr, "POST %s (%lu bytes)\n",
 656                                rpc->service_name, (unsigned long)rpc->len);
 657                        fflush(stderr);
 658                }
 659        }
 660
 661        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 662        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 663        curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 664
 665
 666        rpc->any_written = 0;
 667        err = run_slot(slot, NULL);
 668        if (err == HTTP_REAUTH && !large_request) {
 669                credential_fill(&http_auth);
 670                goto retry;
 671        }
 672        if (err != HTTP_OK)
 673                err = -1;
 674
 675        if (!rpc->any_written)
 676                err = -1;
 677
 678        curl_slist_free_all(headers);
 679        free(gzip_body);
 680        return err;
 681}
 682
 683static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 684{
 685        const char *svc = rpc->service_name;
 686        struct strbuf buf = STRBUF_INIT;
 687        struct strbuf *preamble = rpc->stdin_preamble;
 688        struct child_process client = CHILD_PROCESS_INIT;
 689        int err = 0;
 690
 691        client.in = -1;
 692        client.out = -1;
 693        client.git_cmd = 1;
 694        client.argv = rpc->argv;
 695        if (start_command(&client))
 696                exit(1);
 697        if (preamble)
 698                write_or_die(client.in, preamble->buf, preamble->len);
 699        if (heads)
 700                write_or_die(client.in, heads->buf, heads->len);
 701
 702        rpc->alloc = http_post_buffer;
 703        rpc->buf = xmalloc(rpc->alloc);
 704        rpc->in = client.in;
 705        rpc->out = client.out;
 706        strbuf_init(&rpc->result, 0);
 707
 708        strbuf_addf(&buf, "%s%s", url.buf, svc);
 709        rpc->service_url = strbuf_detach(&buf, NULL);
 710
 711        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 712        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 713
 714        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 715        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 716
 717        while (!err) {
 718                int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 719                if (!n)
 720                        break;
 721                rpc->pos = 0;
 722                rpc->len = n;
 723                err |= post_rpc(rpc);
 724        }
 725
 726        close(client.in);
 727        client.in = -1;
 728        if (!err) {
 729                strbuf_read(&rpc->result, client.out, 0);
 730        } else {
 731                char buf[4096];
 732                for (;;)
 733                        if (xread(client.out, buf, sizeof(buf)) <= 0)
 734                                break;
 735        }
 736
 737        close(client.out);
 738        client.out = -1;
 739
 740        err |= finish_command(&client);
 741        free(rpc->service_url);
 742        free(rpc->hdr_content_type);
 743        free(rpc->hdr_accept);
 744        free(rpc->buf);
 745        strbuf_release(&buf);
 746        return err;
 747}
 748
 749static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 750{
 751        struct walker *walker;
 752        char **targets;
 753        int ret, i;
 754
 755        ALLOC_ARRAY(targets, nr_heads);
 756        if (options.depth || options.deepen_since)
 757                die("dumb http transport does not support shallow capabilities");
 758        for (i = 0; i < nr_heads; i++)
 759                targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
 760
 761        walker = get_http_walker(url.buf);
 762        walker->get_all = 1;
 763        walker->get_tree = 1;
 764        walker->get_history = 1;
 765        walker->get_verbosely = options.verbosity >= 3;
 766        walker->get_recover = 0;
 767        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 768        walker_free(walker);
 769
 770        for (i = 0; i < nr_heads; i++)
 771                free(targets[i]);
 772        free(targets);
 773
 774        return ret ? error("fetch failed.") : 0;
 775}
 776
 777static int fetch_git(struct discovery *heads,
 778        int nr_heads, struct ref **to_fetch)
 779{
 780        struct rpc_state rpc;
 781        struct strbuf preamble = STRBUF_INIT;
 782        int i, err;
 783        struct argv_array args = ARGV_ARRAY_INIT;
 784
 785        argv_array_pushl(&args, "fetch-pack", "--stateless-rpc",
 786                         "--stdin", "--lock-pack", NULL);
 787        if (options.followtags)
 788                argv_array_push(&args, "--include-tag");
 789        if (options.thin)
 790                argv_array_push(&args, "--thin");
 791        if (options.verbosity >= 3)
 792                argv_array_pushl(&args, "-v", "-v", NULL);
 793        if (options.check_self_contained_and_connected)
 794                argv_array_push(&args, "--check-self-contained-and-connected");
 795        if (options.cloning)
 796                argv_array_push(&args, "--cloning");
 797        if (options.update_shallow)
 798                argv_array_push(&args, "--update-shallow");
 799        if (!options.progress)
 800                argv_array_push(&args, "--no-progress");
 801        if (options.depth)
 802                argv_array_pushf(&args, "--depth=%lu", options.depth);
 803        if (options.deepen_since)
 804                argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since);
 805        for (i = 0; i < options.deepen_not.nr; i++)
 806                argv_array_pushf(&args, "--shallow-exclude=%s",
 807                                 options.deepen_not.items[i].string);
 808        if (options.deepen_relative && options.depth)
 809                argv_array_push(&args, "--deepen-relative");
 810        argv_array_push(&args, url.buf);
 811
 812        for (i = 0; i < nr_heads; i++) {
 813                struct ref *ref = to_fetch[i];
 814                if (!*ref->name)
 815                        die("cannot fetch by sha1 over smart http");
 816                packet_buf_write(&preamble, "%s %s\n",
 817                                 oid_to_hex(&ref->old_oid), ref->name);
 818        }
 819        packet_buf_flush(&preamble);
 820
 821        memset(&rpc, 0, sizeof(rpc));
 822        rpc.service_name = "git-upload-pack",
 823        rpc.argv = args.argv;
 824        rpc.stdin_preamble = &preamble;
 825        rpc.gzip_request = 1;
 826
 827        err = rpc_service(&rpc, heads);
 828        if (rpc.result.len)
 829                write_or_die(1, rpc.result.buf, rpc.result.len);
 830        strbuf_release(&rpc.result);
 831        strbuf_release(&preamble);
 832        argv_array_clear(&args);
 833        return err;
 834}
 835
 836static int fetch(int nr_heads, struct ref **to_fetch)
 837{
 838        struct discovery *d = discover_refs("git-upload-pack", 0);
 839        if (d->proto_git)
 840                return fetch_git(d, nr_heads, to_fetch);
 841        else
 842                return fetch_dumb(nr_heads, to_fetch);
 843}
 844
 845static void parse_fetch(struct strbuf *buf)
 846{
 847        struct ref **to_fetch = NULL;
 848        struct ref *list_head = NULL;
 849        struct ref **list = &list_head;
 850        int alloc_heads = 0, nr_heads = 0;
 851
 852        do {
 853                const char *p;
 854                if (skip_prefix(buf->buf, "fetch ", &p)) {
 855                        const char *name;
 856                        struct ref *ref;
 857                        struct object_id old_oid;
 858
 859                        if (get_oid_hex(p, &old_oid))
 860                                die("protocol error: expected sha/ref, got %s'", p);
 861                        if (p[GIT_SHA1_HEXSZ] == ' ')
 862                                name = p + GIT_SHA1_HEXSZ + 1;
 863                        else if (!p[GIT_SHA1_HEXSZ])
 864                                name = "";
 865                        else
 866                                die("protocol error: expected sha/ref, got %s'", p);
 867
 868                        ref = alloc_ref(name);
 869                        oidcpy(&ref->old_oid, &old_oid);
 870
 871                        *list = ref;
 872                        list = &ref->next;
 873
 874                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 875                        to_fetch[nr_heads++] = ref;
 876                }
 877                else
 878                        die("http transport does not support %s", buf->buf);
 879
 880                strbuf_reset(buf);
 881                if (strbuf_getline_lf(buf, stdin) == EOF)
 882                        return;
 883                if (!*buf->buf)
 884                        break;
 885        } while (1);
 886
 887        if (fetch(nr_heads, to_fetch))
 888                exit(128); /* error already reported */
 889        free_refs(list_head);
 890        free(to_fetch);
 891
 892        printf("\n");
 893        fflush(stdout);
 894        strbuf_reset(buf);
 895}
 896
 897static int push_dav(int nr_spec, char **specs)
 898{
 899        struct child_process child = CHILD_PROCESS_INIT;
 900        size_t i;
 901
 902        child.git_cmd = 1;
 903        argv_array_push(&child.args, "http-push");
 904        argv_array_push(&child.args, "--helper-status");
 905        if (options.dry_run)
 906                argv_array_push(&child.args, "--dry-run");
 907        if (options.verbosity > 1)
 908                argv_array_push(&child.args, "--verbose");
 909        argv_array_push(&child.args, url.buf);
 910        for (i = 0; i < nr_spec; i++)
 911                argv_array_push(&child.args, specs[i]);
 912
 913        if (run_command(&child))
 914                die("git-http-push failed");
 915        return 0;
 916}
 917
 918static int push_git(struct discovery *heads, int nr_spec, char **specs)
 919{
 920        struct rpc_state rpc;
 921        int i, err;
 922        struct argv_array args;
 923        struct string_list_item *cas_option;
 924        struct strbuf preamble = STRBUF_INIT;
 925
 926        argv_array_init(&args);
 927        argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 928                         NULL);
 929
 930        if (options.thin)
 931                argv_array_push(&args, "--thin");
 932        if (options.dry_run)
 933                argv_array_push(&args, "--dry-run");
 934        if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
 935                argv_array_push(&args, "--signed=yes");
 936        else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
 937                argv_array_push(&args, "--signed=if-asked");
 938        if (options.verbosity == 0)
 939                argv_array_push(&args, "--quiet");
 940        else if (options.verbosity > 1)
 941                argv_array_push(&args, "--verbose");
 942        argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 943        for_each_string_list_item(cas_option, &cas_options)
 944                argv_array_push(&args, cas_option->string);
 945        argv_array_push(&args, url.buf);
 946
 947        argv_array_push(&args, "--stdin");
 948        for (i = 0; i < nr_spec; i++)
 949                packet_buf_write(&preamble, "%s\n", specs[i]);
 950        packet_buf_flush(&preamble);
 951
 952        memset(&rpc, 0, sizeof(rpc));
 953        rpc.service_name = "git-receive-pack",
 954        rpc.argv = args.argv;
 955        rpc.stdin_preamble = &preamble;
 956
 957        err = rpc_service(&rpc, heads);
 958        if (rpc.result.len)
 959                write_or_die(1, rpc.result.buf, rpc.result.len);
 960        strbuf_release(&rpc.result);
 961        strbuf_release(&preamble);
 962        argv_array_clear(&args);
 963        return err;
 964}
 965
 966static int push(int nr_spec, char **specs)
 967{
 968        struct discovery *heads = discover_refs("git-receive-pack", 1);
 969        int ret;
 970
 971        if (heads->proto_git)
 972                ret = push_git(heads, nr_spec, specs);
 973        else
 974                ret = push_dav(nr_spec, specs);
 975        free_discovery(heads);
 976        return ret;
 977}
 978
 979static void parse_push(struct strbuf *buf)
 980{
 981        char **specs = NULL;
 982        int alloc_spec = 0, nr_spec = 0, i, ret;
 983
 984        do {
 985                if (starts_with(buf->buf, "push ")) {
 986                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 987                        specs[nr_spec++] = xstrdup(buf->buf + 5);
 988                }
 989                else
 990                        die("http transport does not support %s", buf->buf);
 991
 992                strbuf_reset(buf);
 993                if (strbuf_getline_lf(buf, stdin) == EOF)
 994                        goto free_specs;
 995                if (!*buf->buf)
 996                        break;
 997        } while (1);
 998
 999        ret = push(nr_spec, specs);
1000        printf("\n");
1001        fflush(stdout);
1002
1003        if (ret)
1004                exit(128); /* error already reported */
1005
1006 free_specs:
1007        for (i = 0; i < nr_spec; i++)
1008                free(specs[i]);
1009        free(specs);
1010}
1011
1012int cmd_main(int argc, const char **argv)
1013{
1014        struct strbuf buf = STRBUF_INIT;
1015        int nongit;
1016
1017        setup_git_directory_gently(&nongit);
1018        if (argc < 2) {
1019                error("remote-curl: usage: git remote-curl <remote> [<url>]");
1020                return 1;
1021        }
1022
1023        options.verbosity = 1;
1024        options.progress = !!isatty(2);
1025        options.thin = 1;
1026        string_list_init(&options.deepen_not, 1);
1027
1028        remote = remote_get(argv[1]);
1029
1030        if (argc > 2) {
1031                end_url_with_slash(&url, argv[2]);
1032        } else {
1033                end_url_with_slash(&url, remote->url[0]);
1034        }
1035
1036        http_init(remote, url.buf, 0);
1037
1038        do {
1039                const char *arg;
1040
1041                if (strbuf_getline_lf(&buf, stdin) == EOF) {
1042                        if (ferror(stdin))
1043                                error("remote-curl: error reading command stream from git");
1044                        return 1;
1045                }
1046                if (buf.len == 0)
1047                        break;
1048                if (starts_with(buf.buf, "fetch ")) {
1049                        if (nongit)
1050                                die("remote-curl: fetch attempted without a local repo");
1051                        parse_fetch(&buf);
1052
1053                } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1054                        int for_push = !!strstr(buf.buf + 4, "for-push");
1055                        output_refs(get_refs(for_push));
1056
1057                } else if (starts_with(buf.buf, "push ")) {
1058                        parse_push(&buf);
1059
1060                } else if (skip_prefix(buf.buf, "option ", &arg)) {
1061                        char *value = strchr(arg, ' ');
1062                        int result;
1063
1064                        if (value)
1065                                *value++ = '\0';
1066                        else
1067                                value = "true";
1068
1069                        result = set_option(arg, value);
1070                        if (!result)
1071                                printf("ok\n");
1072                        else if (result < 0)
1073                                printf("error invalid value\n");
1074                        else
1075                                printf("unsupported\n");
1076                        fflush(stdout);
1077
1078                } else if (!strcmp(buf.buf, "capabilities")) {
1079                        printf("fetch\n");
1080                        printf("option\n");
1081                        printf("push\n");
1082                        printf("check-connectivity\n");
1083                        printf("\n");
1084                        fflush(stdout);
1085                } else {
1086                        error("remote-curl: unknown command '%s' from git", buf.buf);
1087                        return 1;
1088                }
1089                strbuf_reset(&buf);
1090        } while (1);
1091
1092        http_cleanup();
1093
1094        return 0;
1095}