Andrew's git / gitweb.git / remote-curl.c
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remote-curl.con commit index: improve constness for reading blob data (8754250)
   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 http_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(&http_options, 0, sizeof(http_options));
 295        http_options.content_type = &type;
 296        http_options.charset = &charset;
 297        http_options.effective_url = &effective_url;
 298        http_options.base_url = &url;
 299        http_options.initial_request = 1;
 300        http_options.no_cache = 1;
 301        http_options.keep_error = 1;
 302
 303        http_ret = http_get_strbuf(refs_url.buf, &buffer, &http_options);
 304        switch (http_ret) {
 305        case HTTP_OK:
 306                break;
 307        case HTTP_MISSING_TARGET:
 308                show_http_message(&type, &charset, &buffer);
 309                die("repository '%s' not found", url.buf);
 310        case HTTP_NOAUTH:
 311                show_http_message(&type, &charset, &buffer);
 312                die("Authentication failed for '%s'", url.buf);
 313        default:
 314                show_http_message(&type, &charset, &buffer);
 315                die("unable to access '%s': %s", url.buf, curl_errorstr);
 316        }
 317
 318        if (options.verbosity && !starts_with(refs_url.buf, url.buf))
 319                warning(_("redirecting to %s"), url.buf);
 320
 321        last= xcalloc(1, sizeof(*last_discovery));
 322        last->service = service;
 323        last->buf_alloc = strbuf_detach(&buffer, &last->len);
 324        last->buf = last->buf_alloc;
 325
 326        strbuf_addf(&exp, "application/x-%s-advertisement", service);
 327        if (maybe_smart &&
 328            (5 <= last->len && last->buf[4] == '#') &&
 329            !strbuf_cmp(&exp, &type)) {
 330                char *line;
 331
 332                /*
 333                 * smart HTTP response; validate that the service
 334                 * pkt-line matches our request.
 335                 */
 336                line = packet_read_line_buf(&last->buf, &last->len, NULL);
 337
 338                strbuf_reset(&exp);
 339                strbuf_addf(&exp, "# service=%s", service);
 340                if (strcmp(line, exp.buf))
 341                        die("invalid server response; got '%s'", line);
 342                strbuf_release(&exp);
 343
 344                /* The header can include additional metadata lines, up
 345                 * until a packet flush marker.  Ignore these now, but
 346                 * in the future we might start to scan them.
 347                 */
 348                while (packet_read_line_buf(&last->buf, &last->len, NULL))
 349                        ;
 350
 351                last->proto_git = 1;
 352        }
 353
 354        if (last->proto_git)
 355                last->refs = parse_git_refs(last, for_push);
 356        else
 357                last->refs = parse_info_refs(last);
 358
 359        strbuf_release(&refs_url);
 360        strbuf_release(&exp);
 361        strbuf_release(&type);
 362        strbuf_release(&charset);
 363        strbuf_release(&effective_url);
 364        strbuf_release(&buffer);
 365        last_discovery = last;
 366        return last;
 367}
 368
 369static struct ref *get_refs(int for_push)
 370{
 371        struct discovery *heads;
 372
 373        if (for_push)
 374                heads = discover_refs("git-receive-pack", for_push);
 375        else
 376                heads = discover_refs("git-upload-pack", for_push);
 377
 378        return heads->refs;
 379}
 380
 381static void output_refs(struct ref *refs)
 382{
 383        struct ref *posn;
 384        for (posn = refs; posn; posn = posn->next) {
 385                if (posn->symref)
 386                        printf("@%s %s\n", posn->symref, posn->name);
 387                else
 388                        printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name);
 389        }
 390        printf("\n");
 391        fflush(stdout);
 392}
 393
 394struct rpc_state {
 395        const char *service_name;
 396        const char **argv;
 397        struct strbuf *stdin_preamble;
 398        char *service_url;
 399        char *hdr_content_type;
 400        char *hdr_accept;
 401        char *buf;
 402        size_t alloc;
 403        size_t len;
 404        size_t pos;
 405        int in;
 406        int out;
 407        int any_written;
 408        struct strbuf result;
 409        unsigned gzip_request : 1;
 410        unsigned initial_buffer : 1;
 411};
 412
 413static size_t rpc_out(void *ptr, size_t eltsize,
 414                size_t nmemb, void *buffer_)
 415{
 416        size_t max = eltsize * nmemb;
 417        struct rpc_state *rpc = buffer_;
 418        size_t avail = rpc->len - rpc->pos;
 419
 420        if (!avail) {
 421                rpc->initial_buffer = 0;
 422                avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 423                if (!avail)
 424                        return 0;
 425                rpc->pos = 0;
 426                rpc->len = avail;
 427        }
 428
 429        if (max < avail)
 430                avail = max;
 431        memcpy(ptr, rpc->buf + rpc->pos, avail);
 432        rpc->pos += avail;
 433        return avail;
 434}
 435
 436#ifndef NO_CURL_IOCTL
 437static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 438{
 439        struct rpc_state *rpc = clientp;
 440
 441        switch (cmd) {
 442        case CURLIOCMD_NOP:
 443                return CURLIOE_OK;
 444
 445        case CURLIOCMD_RESTARTREAD:
 446                if (rpc->initial_buffer) {
 447                        rpc->pos = 0;
 448                        return CURLIOE_OK;
 449                }
 450                error("unable to rewind rpc post data - try increasing http.postBuffer");
 451                return CURLIOE_FAILRESTART;
 452
 453        default:
 454                return CURLIOE_UNKNOWNCMD;
 455        }
 456}
 457#endif
 458
 459static size_t rpc_in(char *ptr, size_t eltsize,
 460                size_t nmemb, void *buffer_)
 461{
 462        size_t size = eltsize * nmemb;
 463        struct rpc_state *rpc = buffer_;
 464        if (size)
 465                rpc->any_written = 1;
 466        write_or_die(rpc->in, ptr, size);
 467        return size;
 468}
 469
 470static int run_slot(struct active_request_slot *slot,
 471                    struct slot_results *results)
 472{
 473        int err;
 474        struct slot_results results_buf;
 475
 476        if (!results)
 477                results = &results_buf;
 478
 479        err = run_one_slot(slot, results);
 480
 481        if (err != HTTP_OK && err != HTTP_REAUTH) {
 482                struct strbuf msg = STRBUF_INIT;
 483                if (results->http_code && results->http_code != 200)
 484                        strbuf_addf(&msg, "HTTP %ld", results->http_code);
 485                if (results->curl_result != CURLE_OK) {
 486                        if (msg.len)
 487                                strbuf_addch(&msg, ' ');
 488                        strbuf_addf(&msg, "curl %d", results->curl_result);
 489                        if (curl_errorstr[0]) {
 490                                strbuf_addch(&msg, ' ');
 491                                strbuf_addstr(&msg, curl_errorstr);
 492                        }
 493                }
 494                error("RPC failed; %s", msg.buf);
 495                strbuf_release(&msg);
 496        }
 497
 498        return err;
 499}
 500
 501static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 502{
 503        struct active_request_slot *slot;
 504        struct curl_slist *headers = http_copy_default_headers();
 505        struct strbuf buf = STRBUF_INIT;
 506        int err;
 507
 508        slot = get_active_slot();
 509
 510        headers = curl_slist_append(headers, rpc->hdr_content_type);
 511        headers = curl_slist_append(headers, rpc->hdr_accept);
 512
 513        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 514        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 515        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 516        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 517        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 518        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 519        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 520        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 521        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 522
 523        err = run_slot(slot, results);
 524
 525        curl_slist_free_all(headers);
 526        strbuf_release(&buf);
 527        return err;
 528}
 529
 530static int post_rpc(struct rpc_state *rpc)
 531{
 532        struct active_request_slot *slot;
 533        struct curl_slist *headers = http_copy_default_headers();
 534        int use_gzip = rpc->gzip_request;
 535        char *gzip_body = NULL;
 536        size_t gzip_size = 0;
 537        int err, large_request = 0;
 538        int needs_100_continue = 0;
 539
 540        /* Try to load the entire request, if we can fit it into the
 541         * allocated buffer space we can use HTTP/1.0 and avoid the
 542         * chunked encoding mess.
 543         */
 544        while (1) {
 545                size_t left = rpc->alloc - rpc->len;
 546                char *buf = rpc->buf + rpc->len;
 547                int n;
 548
 549                if (left < LARGE_PACKET_MAX) {
 550                        large_request = 1;
 551                        use_gzip = 0;
 552                        break;
 553                }
 554
 555                n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 556                if (!n)
 557                        break;
 558                rpc->len += n;
 559        }
 560
 561        if (large_request) {
 562                struct slot_results results;
 563
 564                do {
 565                        err = probe_rpc(rpc, &results);
 566                        if (err == HTTP_REAUTH)
 567                                credential_fill(&http_auth);
 568                } while (err == HTTP_REAUTH);
 569                if (err != HTTP_OK)
 570                        return -1;
 571
 572                if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 573                        needs_100_continue = 1;
 574        }
 575
 576        headers = curl_slist_append(headers, rpc->hdr_content_type);
 577        headers = curl_slist_append(headers, rpc->hdr_accept);
 578        headers = curl_slist_append(headers, needs_100_continue ?
 579                "Expect: 100-continue" : "Expect:");
 580
 581retry:
 582        slot = get_active_slot();
 583
 584        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 585        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 586        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 587        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 588
 589        if (large_request) {
 590                /* The request body is large and the size cannot be predicted.
 591                 * We must use chunked encoding to send it.
 592                 */
 593                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 594                rpc->initial_buffer = 1;
 595                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 596                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 597#ifndef NO_CURL_IOCTL
 598                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 599                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 600#endif
 601                if (options.verbosity > 1) {
 602                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 603                        fflush(stderr);
 604                }
 605
 606        } else if (gzip_body) {
 607                /*
 608                 * If we are looping to retry authentication, then the previous
 609                 * run will have set up the headers and gzip buffer already,
 610                 * and we just need to send it.
 611                 */
 612                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 613                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 614
 615        } else if (use_gzip && 1024 < rpc->len) {
 616                /* The client backend isn't giving us compressed data so
 617                 * we can try to deflate it ourselves, this may save on.
 618                 * the transfer time.
 619                 */
 620                git_zstream stream;
 621                int ret;
 622
 623                git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 624                gzip_size = git_deflate_bound(&stream, rpc->len);
 625                gzip_body = xmalloc(gzip_size);
 626
 627                stream.next_in = (unsigned char *)rpc->buf;
 628                stream.avail_in = rpc->len;
 629                stream.next_out = (unsigned char *)gzip_body;
 630                stream.avail_out = gzip_size;
 631
 632                ret = git_deflate(&stream, Z_FINISH);
 633                if (ret != Z_STREAM_END)
 634                        die("cannot deflate request; zlib deflate error %d", ret);
 635
 636                ret = git_deflate_end_gently(&stream);
 637                if (ret != Z_OK)
 638                        die("cannot deflate request; zlib end error %d", ret);
 639
 640                gzip_size = stream.total_out;
 641
 642                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 643                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 644                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 645
 646                if (options.verbosity > 1) {
 647                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 648                                rpc->service_name,
 649                                (unsigned long)rpc->len, (unsigned long)gzip_size);
 650                        fflush(stderr);
 651                }
 652        } else {
 653                /* We know the complete request size in advance, use the
 654                 * more normal Content-Length approach.
 655                 */
 656                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 657                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 658                if (options.verbosity > 1) {
 659                        fprintf(stderr, "POST %s (%lu bytes)\n",
 660                                rpc->service_name, (unsigned long)rpc->len);
 661                        fflush(stderr);
 662                }
 663        }
 664
 665        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 666        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 667        curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 668
 669
 670        rpc->any_written = 0;
 671        err = run_slot(slot, NULL);
 672        if (err == HTTP_REAUTH && !large_request) {
 673                credential_fill(&http_auth);
 674                goto retry;
 675        }
 676        if (err != HTTP_OK)
 677                err = -1;
 678
 679        if (!rpc->any_written)
 680                err = -1;
 681
 682        curl_slist_free_all(headers);
 683        free(gzip_body);
 684        return err;
 685}
 686
 687static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 688{
 689        const char *svc = rpc->service_name;
 690        struct strbuf buf = STRBUF_INIT;
 691        struct strbuf *preamble = rpc->stdin_preamble;
 692        struct child_process client = CHILD_PROCESS_INIT;
 693        int err = 0;
 694
 695        client.in = -1;
 696        client.out = -1;
 697        client.git_cmd = 1;
 698        client.argv = rpc->argv;
 699        if (start_command(&client))
 700                exit(1);
 701        if (preamble)
 702                write_or_die(client.in, preamble->buf, preamble->len);
 703        if (heads)
 704                write_or_die(client.in, heads->buf, heads->len);
 705
 706        rpc->alloc = http_post_buffer;
 707        rpc->buf = xmalloc(rpc->alloc);
 708        rpc->in = client.in;
 709        rpc->out = client.out;
 710        strbuf_init(&rpc->result, 0);
 711
 712        strbuf_addf(&buf, "%s%s", url.buf, svc);
 713        rpc->service_url = strbuf_detach(&buf, NULL);
 714
 715        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 716        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 717
 718        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 719        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 720
 721        while (!err) {
 722                int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 723                if (!n)
 724                        break;
 725                rpc->pos = 0;
 726                rpc->len = n;
 727                err |= post_rpc(rpc);
 728        }
 729
 730        close(client.in);
 731        client.in = -1;
 732        if (!err) {
 733                strbuf_read(&rpc->result, client.out, 0);
 734        } else {
 735                char buf[4096];
 736                for (;;)
 737                        if (xread(client.out, buf, sizeof(buf)) <= 0)
 738                                break;
 739        }
 740
 741        close(client.out);
 742        client.out = -1;
 743
 744        err |= finish_command(&client);
 745        free(rpc->service_url);
 746        free(rpc->hdr_content_type);
 747        free(rpc->hdr_accept);
 748        free(rpc->buf);
 749        strbuf_release(&buf);
 750        return err;
 751}
 752
 753static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 754{
 755        struct walker *walker;
 756        char **targets;
 757        int ret, i;
 758
 759        ALLOC_ARRAY(targets, nr_heads);
 760        if (options.depth || options.deepen_since)
 761                die("dumb http transport does not support shallow capabilities");
 762        for (i = 0; i < nr_heads; i++)
 763                targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
 764
 765        walker = get_http_walker(url.buf);
 766        walker->get_all = 1;
 767        walker->get_tree = 1;
 768        walker->get_history = 1;
 769        walker->get_verbosely = options.verbosity >= 3;
 770        walker->get_recover = 0;
 771        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 772        walker_free(walker);
 773
 774        for (i = 0; i < nr_heads; i++)
 775                free(targets[i]);
 776        free(targets);
 777
 778        return ret ? error("fetch failed.") : 0;
 779}
 780
 781static int fetch_git(struct discovery *heads,
 782        int nr_heads, struct ref **to_fetch)
 783{
 784        struct rpc_state rpc;
 785        struct strbuf preamble = STRBUF_INIT;
 786        int i, err;
 787        struct argv_array args = ARGV_ARRAY_INIT;
 788
 789        argv_array_pushl(&args, "fetch-pack", "--stateless-rpc",
 790                         "--stdin", "--lock-pack", NULL);
 791        if (options.followtags)
 792                argv_array_push(&args, "--include-tag");
 793        if (options.thin)
 794                argv_array_push(&args, "--thin");
 795        if (options.verbosity >= 3)
 796                argv_array_pushl(&args, "-v", "-v", NULL);
 797        if (options.check_self_contained_and_connected)
 798                argv_array_push(&args, "--check-self-contained-and-connected");
 799        if (options.cloning)
 800                argv_array_push(&args, "--cloning");
 801        if (options.update_shallow)
 802                argv_array_push(&args, "--update-shallow");
 803        if (!options.progress)
 804                argv_array_push(&args, "--no-progress");
 805        if (options.depth)
 806                argv_array_pushf(&args, "--depth=%lu", options.depth);
 807        if (options.deepen_since)
 808                argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since);
 809        for (i = 0; i < options.deepen_not.nr; i++)
 810                argv_array_pushf(&args, "--shallow-exclude=%s",
 811                                 options.deepen_not.items[i].string);
 812        if (options.deepen_relative && options.depth)
 813                argv_array_push(&args, "--deepen-relative");
 814        argv_array_push(&args, url.buf);
 815
 816        for (i = 0; i < nr_heads; i++) {
 817                struct ref *ref = to_fetch[i];
 818                if (!*ref->name)
 819                        die("cannot fetch by sha1 over smart http");
 820                packet_buf_write(&preamble, "%s %s\n",
 821                                 oid_to_hex(&ref->old_oid), ref->name);
 822        }
 823        packet_buf_flush(&preamble);
 824
 825        memset(&rpc, 0, sizeof(rpc));
 826        rpc.service_name = "git-upload-pack",
 827        rpc.argv = args.argv;
 828        rpc.stdin_preamble = &preamble;
 829        rpc.gzip_request = 1;
 830
 831        err = rpc_service(&rpc, heads);
 832        if (rpc.result.len)
 833                write_or_die(1, rpc.result.buf, rpc.result.len);
 834        strbuf_release(&rpc.result);
 835        strbuf_release(&preamble);
 836        argv_array_clear(&args);
 837        return err;
 838}
 839
 840static int fetch(int nr_heads, struct ref **to_fetch)
 841{
 842        struct discovery *d = discover_refs("git-upload-pack", 0);
 843        if (d->proto_git)
 844                return fetch_git(d, nr_heads, to_fetch);
 845        else
 846                return fetch_dumb(nr_heads, to_fetch);
 847}
 848
 849static void parse_fetch(struct strbuf *buf)
 850{
 851        struct ref **to_fetch = NULL;
 852        struct ref *list_head = NULL;
 853        struct ref **list = &list_head;
 854        int alloc_heads = 0, nr_heads = 0;
 855
 856        do {
 857                const char *p;
 858                if (skip_prefix(buf->buf, "fetch ", &p)) {
 859                        const char *name;
 860                        struct ref *ref;
 861                        struct object_id old_oid;
 862
 863                        if (get_oid_hex(p, &old_oid))
 864                                die("protocol error: expected sha/ref, got %s'", p);
 865                        if (p[GIT_SHA1_HEXSZ] == ' ')
 866                                name = p + GIT_SHA1_HEXSZ + 1;
 867                        else if (!p[GIT_SHA1_HEXSZ])
 868                                name = "";
 869                        else
 870                                die("protocol error: expected sha/ref, got %s'", p);
 871
 872                        ref = alloc_ref(name);
 873                        oidcpy(&ref->old_oid, &old_oid);
 874
 875                        *list = ref;
 876                        list = &ref->next;
 877
 878                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 879                        to_fetch[nr_heads++] = ref;
 880                }
 881                else
 882                        die("http transport does not support %s", buf->buf);
 883
 884                strbuf_reset(buf);
 885                if (strbuf_getline_lf(buf, stdin) == EOF)
 886                        return;
 887                if (!*buf->buf)
 888                        break;
 889        } while (1);
 890
 891        if (fetch(nr_heads, to_fetch))
 892                exit(128); /* error already reported */
 893        free_refs(list_head);
 894        free(to_fetch);
 895
 896        printf("\n");
 897        fflush(stdout);
 898        strbuf_reset(buf);
 899}
 900
 901static int push_dav(int nr_spec, char **specs)
 902{
 903        struct child_process child = CHILD_PROCESS_INIT;
 904        size_t i;
 905
 906        child.git_cmd = 1;
 907        argv_array_push(&child.args, "http-push");
 908        argv_array_push(&child.args, "--helper-status");
 909        if (options.dry_run)
 910                argv_array_push(&child.args, "--dry-run");
 911        if (options.verbosity > 1)
 912                argv_array_push(&child.args, "--verbose");
 913        argv_array_push(&child.args, url.buf);
 914        for (i = 0; i < nr_spec; i++)
 915                argv_array_push(&child.args, specs[i]);
 916
 917        if (run_command(&child))
 918                die("git-http-push failed");
 919        return 0;
 920}
 921
 922static int push_git(struct discovery *heads, int nr_spec, char **specs)
 923{
 924        struct rpc_state rpc;
 925        int i, err;
 926        struct argv_array args;
 927        struct string_list_item *cas_option;
 928        struct strbuf preamble = STRBUF_INIT;
 929
 930        argv_array_init(&args);
 931        argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 932                         NULL);
 933
 934        if (options.thin)
 935                argv_array_push(&args, "--thin");
 936        if (options.dry_run)
 937                argv_array_push(&args, "--dry-run");
 938        if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
 939                argv_array_push(&args, "--signed=yes");
 940        else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
 941                argv_array_push(&args, "--signed=if-asked");
 942        if (options.verbosity == 0)
 943                argv_array_push(&args, "--quiet");
 944        else if (options.verbosity > 1)
 945                argv_array_push(&args, "--verbose");
 946        argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 947        for_each_string_list_item(cas_option, &cas_options)
 948                argv_array_push(&args, cas_option->string);
 949        argv_array_push(&args, url.buf);
 950
 951        argv_array_push(&args, "--stdin");
 952        for (i = 0; i < nr_spec; i++)
 953                packet_buf_write(&preamble, "%s\n", specs[i]);
 954        packet_buf_flush(&preamble);
 955
 956        memset(&rpc, 0, sizeof(rpc));
 957        rpc.service_name = "git-receive-pack",
 958        rpc.argv = args.argv;
 959        rpc.stdin_preamble = &preamble;
 960
 961        err = rpc_service(&rpc, heads);
 962        if (rpc.result.len)
 963                write_or_die(1, rpc.result.buf, rpc.result.len);
 964        strbuf_release(&rpc.result);
 965        strbuf_release(&preamble);
 966        argv_array_clear(&args);
 967        return err;
 968}
 969
 970static int push(int nr_spec, char **specs)
 971{
 972        struct discovery *heads = discover_refs("git-receive-pack", 1);
 973        int ret;
 974
 975        if (heads->proto_git)
 976                ret = push_git(heads, nr_spec, specs);
 977        else
 978                ret = push_dav(nr_spec, specs);
 979        free_discovery(heads);
 980        return ret;
 981}
 982
 983static void parse_push(struct strbuf *buf)
 984{
 985        char **specs = NULL;
 986        int alloc_spec = 0, nr_spec = 0, i, ret;
 987
 988        do {
 989                if (starts_with(buf->buf, "push ")) {
 990                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 991                        specs[nr_spec++] = xstrdup(buf->buf + 5);
 992                }
 993                else
 994                        die("http transport does not support %s", buf->buf);
 995
 996                strbuf_reset(buf);
 997                if (strbuf_getline_lf(buf, stdin) == EOF)
 998                        goto free_specs;
 999                if (!*buf->buf)
1000                        break;
1001        } while (1);
1002
1003        ret = push(nr_spec, specs);
1004        printf("\n");
1005        fflush(stdout);
1006
1007        if (ret)
1008                exit(128); /* error already reported */
1009
1010 free_specs:
1011        for (i = 0; i < nr_spec; i++)
1012                free(specs[i]);
1013        free(specs);
1014}
1015
1016int cmd_main(int argc, const char **argv)
1017{
1018        struct strbuf buf = STRBUF_INIT;
1019        int nongit;
1020
1021        setup_git_directory_gently(&nongit);
1022        if (argc < 2) {
1023                error("remote-curl: usage: git remote-curl <remote> [<url>]");
1024                return 1;
1025        }
1026
1027        options.verbosity = 1;
1028        options.progress = !!isatty(2);
1029        options.thin = 1;
1030        string_list_init(&options.deepen_not, 1);
1031
1032        remote = remote_get(argv[1]);
1033
1034        if (argc > 2) {
1035                end_url_with_slash(&url, argv[2]);
1036        } else {
1037                end_url_with_slash(&url, remote->url[0]);
1038        }
1039
1040        http_init(remote, url.buf, 0);
1041
1042        do {
1043                const char *arg;
1044
1045                if (strbuf_getline_lf(&buf, stdin) == EOF) {
1046                        if (ferror(stdin))
1047                                error("remote-curl: error reading command stream from git");
1048                        return 1;
1049                }
1050                if (buf.len == 0)
1051                        break;
1052                if (starts_with(buf.buf, "fetch ")) {
1053                        if (nongit)
1054                                die("remote-curl: fetch attempted without a local repo");
1055                        parse_fetch(&buf);
1056
1057                } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1058                        int for_push = !!strstr(buf.buf + 4, "for-push");
1059                        output_refs(get_refs(for_push));
1060
1061                } else if (starts_with(buf.buf, "push ")) {
1062                        parse_push(&buf);
1063
1064                } else if (skip_prefix(buf.buf, "option ", &arg)) {
1065                        char *value = strchr(arg, ' ');
1066                        int result;
1067
1068                        if (value)
1069                                *value++ = '\0';
1070                        else
1071                                value = "true";
1072
1073                        result = set_option(arg, value);
1074                        if (!result)
1075                                printf("ok\n");
1076                        else if (result < 0)
1077                                printf("error invalid value\n");
1078                        else
1079                                printf("unsupported\n");
1080                        fflush(stdout);
1081
1082                } else if (!strcmp(buf.buf, "capabilities")) {
1083                        printf("fetch\n");
1084                        printf("option\n");
1085                        printf("push\n");
1086                        printf("check-connectivity\n");
1087                        printf("\n");
1088                        fflush(stdout);
1089                } else {
1090                        error("remote-curl: unknown command '%s' from git", buf.buf);
1091                        return 1;
1092                }
1093                strbuf_reset(&buf);
1094        } while (1);
1095
1096        http_cleanup();
1097
1098        return 0;
1099}