Andrew's git / gitweb.git / remote-curl.c
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remote-curl.con commit Merge branch 'js/test-lib-windows-emulated-yes' (4ecc59a)
   1#include "cache.h"
   2#include "remote.h"
   3#include "strbuf.h"
   4#include "walker.h"
   5#include "http.h"
   6#include "exec_cmd.h"
   7#include "run-command.h"
   8#include "pkt-line.h"
   9#include "string-list.h"
  10#include "sideband.h"
  11#include "argv-array.h"
  12#include "credential.h"
  13#include "sha1-array.h"
  14#include "send-pack.h"
  15
  16static struct remote *remote;
  17/* always ends with a trailing slash */
  18static struct strbuf url = STRBUF_INIT;
  19
  20struct options {
  21        int verbosity;
  22        unsigned long depth;
  23        unsigned progress : 1,
  24                check_self_contained_and_connected : 1,
  25                cloning : 1,
  26                update_shallow : 1,
  27                followtags : 1,
  28                dry_run : 1,
  29                thin : 1,
  30                /* One of the SEND_PACK_PUSH_CERT_* constants. */
  31                push_cert : 2;
  32};
  33static struct options options;
  34static struct string_list cas_options = STRING_LIST_INIT_DUP;
  35
  36static int set_option(const char *name, const char *value)
  37{
  38        if (!strcmp(name, "verbosity")) {
  39                char *end;
  40                int v = strtol(value, &end, 10);
  41                if (value == end || *end)
  42                        return -1;
  43                options.verbosity = v;
  44                return 0;
  45        }
  46        else if (!strcmp(name, "progress")) {
  47                if (!strcmp(value, "true"))
  48                        options.progress = 1;
  49                else if (!strcmp(value, "false"))
  50                        options.progress = 0;
  51                else
  52                        return -1;
  53                return 0;
  54        }
  55        else if (!strcmp(name, "depth")) {
  56                char *end;
  57                unsigned long v = strtoul(value, &end, 10);
  58                if (value == end || *end)
  59                        return -1;
  60                options.depth = v;
  61                return 0;
  62        }
  63        else if (!strcmp(name, "followtags")) {
  64                if (!strcmp(value, "true"))
  65                        options.followtags = 1;
  66                else if (!strcmp(value, "false"))
  67                        options.followtags = 0;
  68                else
  69                        return -1;
  70                return 0;
  71        }
  72        else if (!strcmp(name, "dry-run")) {
  73                if (!strcmp(value, "true"))
  74                        options.dry_run = 1;
  75                else if (!strcmp(value, "false"))
  76                        options.dry_run = 0;
  77                else
  78                        return -1;
  79                return 0;
  80        }
  81        else if (!strcmp(name, "check-connectivity")) {
  82                if (!strcmp(value, "true"))
  83                        options.check_self_contained_and_connected = 1;
  84                else if (!strcmp(value, "false"))
  85                        options.check_self_contained_and_connected = 0;
  86                else
  87                        return -1;
  88                return 0;
  89        }
  90        else if (!strcmp(name, "cas")) {
  91                struct strbuf val = STRBUF_INIT;
  92                strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
  93                string_list_append(&cas_options, val.buf);
  94                strbuf_release(&val);
  95                return 0;
  96        } else if (!strcmp(name, "cloning")) {
  97                if (!strcmp(value, "true"))
  98                        options.cloning = 1;
  99                else if (!strcmp(value, "false"))
 100                        options.cloning = 0;
 101                else
 102                        return -1;
 103                return 0;
 104        } else if (!strcmp(name, "update-shallow")) {
 105                if (!strcmp(value, "true"))
 106                        options.update_shallow = 1;
 107                else if (!strcmp(value, "false"))
 108                        options.update_shallow = 0;
 109                else
 110                        return -1;
 111                return 0;
 112        } else if (!strcmp(name, "pushcert")) {
 113                if (!strcmp(value, "true"))
 114                        options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 115                else if (!strcmp(value, "false"))
 116                        options.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 117                else if (!strcmp(value, "if-asked"))
 118                        options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 119                else
 120                        return -1;
 121                return 0;
 122        } else {
 123                return 1 /* unsupported */;
 124        }
 125}
 126
 127struct discovery {
 128        const char *service;
 129        char *buf_alloc;
 130        char *buf;
 131        size_t len;
 132        struct ref *refs;
 133        struct sha1_array shallow;
 134        unsigned proto_git : 1;
 135};
 136static struct discovery *last_discovery;
 137
 138static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 139{
 140        struct ref *list = NULL;
 141        get_remote_heads(-1, heads->buf, heads->len, &list,
 142                         for_push ? REF_NORMAL : 0, NULL, &heads->shallow);
 143        return list;
 144}
 145
 146static struct ref *parse_info_refs(struct discovery *heads)
 147{
 148        char *data, *start, *mid;
 149        char *ref_name;
 150        int i = 0;
 151
 152        struct ref *refs = NULL;
 153        struct ref *ref = NULL;
 154        struct ref *last_ref = NULL;
 155
 156        data = heads->buf;
 157        start = NULL;
 158        mid = data;
 159        while (i < heads->len) {
 160                if (!start) {
 161                        start = &data[i];
 162                }
 163                if (data[i] == '\t')
 164                        mid = &data[i];
 165                if (data[i] == '\n') {
 166                        if (mid - start != 40)
 167                                die("%sinfo/refs not valid: is this a git repository?",
 168                                    url.buf);
 169                        data[i] = 0;
 170                        ref_name = mid + 1;
 171                        ref = alloc_ref(ref_name);
 172                        get_oid_hex(start, &ref->old_oid);
 173                        if (!refs)
 174                                refs = ref;
 175                        if (last_ref)
 176                                last_ref->next = ref;
 177                        last_ref = ref;
 178                        start = NULL;
 179                }
 180                i++;
 181        }
 182
 183        ref = alloc_ref("HEAD");
 184        if (!http_fetch_ref(url.buf, ref) &&
 185            !resolve_remote_symref(ref, refs)) {
 186                ref->next = refs;
 187                refs = ref;
 188        } else {
 189                free(ref);
 190        }
 191
 192        return refs;
 193}
 194
 195static void free_discovery(struct discovery *d)
 196{
 197        if (d) {
 198                if (d == last_discovery)
 199                        last_discovery = NULL;
 200                free(d->shallow.sha1);
 201                free(d->buf_alloc);
 202                free_refs(d->refs);
 203                free(d);
 204        }
 205}
 206
 207static int show_http_message(struct strbuf *type, struct strbuf *charset,
 208                             struct strbuf *msg)
 209{
 210        const char *p, *eol;
 211
 212        /*
 213         * We only show text/plain parts, as other types are likely
 214         * to be ugly to look at on the user's terminal.
 215         */
 216        if (strcmp(type->buf, "text/plain"))
 217                return -1;
 218        if (charset->len)
 219                strbuf_reencode(msg, charset->buf, get_log_output_encoding());
 220
 221        strbuf_trim(msg);
 222        if (!msg->len)
 223                return -1;
 224
 225        p = msg->buf;
 226        do {
 227                eol = strchrnul(p, '\n');
 228                fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 229                p = eol + 1;
 230        } while(*eol);
 231        return 0;
 232}
 233
 234static struct discovery *discover_refs(const char *service, int for_push)
 235{
 236        struct strbuf exp = STRBUF_INIT;
 237        struct strbuf type = STRBUF_INIT;
 238        struct strbuf charset = STRBUF_INIT;
 239        struct strbuf buffer = STRBUF_INIT;
 240        struct strbuf refs_url = STRBUF_INIT;
 241        struct strbuf effective_url = STRBUF_INIT;
 242        struct discovery *last = last_discovery;
 243        int http_ret, maybe_smart = 0;
 244        struct http_get_options options;
 245
 246        if (last && !strcmp(service, last->service))
 247                return last;
 248        free_discovery(last);
 249
 250        strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 251        if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 252             git_env_bool("GIT_SMART_HTTP", 1)) {
 253                maybe_smart = 1;
 254                if (!strchr(url.buf, '?'))
 255                        strbuf_addch(&refs_url, '?');
 256                else
 257                        strbuf_addch(&refs_url, '&');
 258                strbuf_addf(&refs_url, "service=%s", service);
 259        }
 260
 261        memset(&options, 0, sizeof(options));
 262        options.content_type = &type;
 263        options.charset = &charset;
 264        options.effective_url = &effective_url;
 265        options.base_url = &url;
 266        options.no_cache = 1;
 267        options.keep_error = 1;
 268
 269        http_ret = http_get_strbuf(refs_url.buf, &buffer, &options);
 270        switch (http_ret) {
 271        case HTTP_OK:
 272                break;
 273        case HTTP_MISSING_TARGET:
 274                show_http_message(&type, &charset, &buffer);
 275                die("repository '%s' not found", url.buf);
 276        case HTTP_NOAUTH:
 277                show_http_message(&type, &charset, &buffer);
 278                die("Authentication failed for '%s'", url.buf);
 279        default:
 280                show_http_message(&type, &charset, &buffer);
 281                die("unable to access '%s': %s", url.buf, curl_errorstr);
 282        }
 283
 284        last= xcalloc(1, sizeof(*last_discovery));
 285        last->service = service;
 286        last->buf_alloc = strbuf_detach(&buffer, &last->len);
 287        last->buf = last->buf_alloc;
 288
 289        strbuf_addf(&exp, "application/x-%s-advertisement", service);
 290        if (maybe_smart &&
 291            (5 <= last->len && last->buf[4] == '#') &&
 292            !strbuf_cmp(&exp, &type)) {
 293                char *line;
 294
 295                /*
 296                 * smart HTTP response; validate that the service
 297                 * pkt-line matches our request.
 298                 */
 299                line = packet_read_line_buf(&last->buf, &last->len, NULL);
 300
 301                strbuf_reset(&exp);
 302                strbuf_addf(&exp, "# service=%s", service);
 303                if (strcmp(line, exp.buf))
 304                        die("invalid server response; got '%s'", line);
 305                strbuf_release(&exp);
 306
 307                /* The header can include additional metadata lines, up
 308                 * until a packet flush marker.  Ignore these now, but
 309                 * in the future we might start to scan them.
 310                 */
 311                while (packet_read_line_buf(&last->buf, &last->len, NULL))
 312                        ;
 313
 314                last->proto_git = 1;
 315        }
 316
 317        if (last->proto_git)
 318                last->refs = parse_git_refs(last, for_push);
 319        else
 320                last->refs = parse_info_refs(last);
 321
 322        strbuf_release(&refs_url);
 323        strbuf_release(&exp);
 324        strbuf_release(&type);
 325        strbuf_release(&charset);
 326        strbuf_release(&effective_url);
 327        strbuf_release(&buffer);
 328        last_discovery = last;
 329        return last;
 330}
 331
 332static struct ref *get_refs(int for_push)
 333{
 334        struct discovery *heads;
 335
 336        if (for_push)
 337                heads = discover_refs("git-receive-pack", for_push);
 338        else
 339                heads = discover_refs("git-upload-pack", for_push);
 340
 341        return heads->refs;
 342}
 343
 344static void output_refs(struct ref *refs)
 345{
 346        struct ref *posn;
 347        for (posn = refs; posn; posn = posn->next) {
 348                if (posn->symref)
 349                        printf("@%s %s\n", posn->symref, posn->name);
 350                else
 351                        printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name);
 352        }
 353        printf("\n");
 354        fflush(stdout);
 355}
 356
 357struct rpc_state {
 358        const char *service_name;
 359        const char **argv;
 360        struct strbuf *stdin_preamble;
 361        char *service_url;
 362        char *hdr_content_type;
 363        char *hdr_accept;
 364        char *buf;
 365        size_t alloc;
 366        size_t len;
 367        size_t pos;
 368        int in;
 369        int out;
 370        struct strbuf result;
 371        unsigned gzip_request : 1;
 372        unsigned initial_buffer : 1;
 373};
 374
 375static size_t rpc_out(void *ptr, size_t eltsize,
 376                size_t nmemb, void *buffer_)
 377{
 378        size_t max = eltsize * nmemb;
 379        struct rpc_state *rpc = buffer_;
 380        size_t avail = rpc->len - rpc->pos;
 381
 382        if (!avail) {
 383                rpc->initial_buffer = 0;
 384                avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 385                if (!avail)
 386                        return 0;
 387                rpc->pos = 0;
 388                rpc->len = avail;
 389        }
 390
 391        if (max < avail)
 392                avail = max;
 393        memcpy(ptr, rpc->buf + rpc->pos, avail);
 394        rpc->pos += avail;
 395        return avail;
 396}
 397
 398#ifndef NO_CURL_IOCTL
 399static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 400{
 401        struct rpc_state *rpc = clientp;
 402
 403        switch (cmd) {
 404        case CURLIOCMD_NOP:
 405                return CURLIOE_OK;
 406
 407        case CURLIOCMD_RESTARTREAD:
 408                if (rpc->initial_buffer) {
 409                        rpc->pos = 0;
 410                        return CURLIOE_OK;
 411                }
 412                error("unable to rewind rpc post data - try increasing http.postBuffer");
 413                return CURLIOE_FAILRESTART;
 414
 415        default:
 416                return CURLIOE_UNKNOWNCMD;
 417        }
 418}
 419#endif
 420
 421static size_t rpc_in(char *ptr, size_t eltsize,
 422                size_t nmemb, void *buffer_)
 423{
 424        size_t size = eltsize * nmemb;
 425        struct rpc_state *rpc = buffer_;
 426        write_or_die(rpc->in, ptr, size);
 427        return size;
 428}
 429
 430static int run_slot(struct active_request_slot *slot,
 431                    struct slot_results *results)
 432{
 433        int err;
 434        struct slot_results results_buf;
 435
 436        if (!results)
 437                results = &results_buf;
 438
 439        err = run_one_slot(slot, results);
 440
 441        if (err != HTTP_OK && err != HTTP_REAUTH) {
 442                error("RPC failed; result=%d, HTTP code = %ld",
 443                      results->curl_result, results->http_code);
 444        }
 445
 446        return err;
 447}
 448
 449static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 450{
 451        struct active_request_slot *slot;
 452        struct curl_slist *headers = NULL;
 453        struct strbuf buf = STRBUF_INIT;
 454        int err;
 455
 456        slot = get_active_slot();
 457
 458        headers = curl_slist_append(headers, rpc->hdr_content_type);
 459        headers = curl_slist_append(headers, rpc->hdr_accept);
 460
 461        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 462        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 463        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 464        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 465        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 466        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 467        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 468        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 469        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 470
 471        err = run_slot(slot, results);
 472
 473        curl_slist_free_all(headers);
 474        strbuf_release(&buf);
 475        return err;
 476}
 477
 478static int post_rpc(struct rpc_state *rpc)
 479{
 480        struct active_request_slot *slot;
 481        struct curl_slist *headers = NULL;
 482        int use_gzip = rpc->gzip_request;
 483        char *gzip_body = NULL;
 484        size_t gzip_size = 0;
 485        int err, large_request = 0;
 486        int needs_100_continue = 0;
 487
 488        /* Try to load the entire request, if we can fit it into the
 489         * allocated buffer space we can use HTTP/1.0 and avoid the
 490         * chunked encoding mess.
 491         */
 492        while (1) {
 493                size_t left = rpc->alloc - rpc->len;
 494                char *buf = rpc->buf + rpc->len;
 495                int n;
 496
 497                if (left < LARGE_PACKET_MAX) {
 498                        large_request = 1;
 499                        use_gzip = 0;
 500                        break;
 501                }
 502
 503                n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 504                if (!n)
 505                        break;
 506                rpc->len += n;
 507        }
 508
 509        if (large_request) {
 510                struct slot_results results;
 511
 512                do {
 513                        err = probe_rpc(rpc, &results);
 514                        if (err == HTTP_REAUTH)
 515                                credential_fill(&http_auth);
 516                } while (err == HTTP_REAUTH);
 517                if (err != HTTP_OK)
 518                        return -1;
 519
 520                if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 521                        needs_100_continue = 1;
 522        }
 523
 524        headers = curl_slist_append(headers, rpc->hdr_content_type);
 525        headers = curl_slist_append(headers, rpc->hdr_accept);
 526        headers = curl_slist_append(headers, needs_100_continue ?
 527                "Expect: 100-continue" : "Expect:");
 528
 529retry:
 530        slot = get_active_slot();
 531
 532        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 533        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 534        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 535        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 536
 537        if (large_request) {
 538                /* The request body is large and the size cannot be predicted.
 539                 * We must use chunked encoding to send it.
 540                 */
 541                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 542                rpc->initial_buffer = 1;
 543                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 544                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 545#ifndef NO_CURL_IOCTL
 546                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 547                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 548#endif
 549                if (options.verbosity > 1) {
 550                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 551                        fflush(stderr);
 552                }
 553
 554        } else if (gzip_body) {
 555                /*
 556                 * If we are looping to retry authentication, then the previous
 557                 * run will have set up the headers and gzip buffer already,
 558                 * and we just need to send it.
 559                 */
 560                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 561                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 562
 563        } else if (use_gzip && 1024 < rpc->len) {
 564                /* The client backend isn't giving us compressed data so
 565                 * we can try to deflate it ourselves, this may save on.
 566                 * the transfer time.
 567                 */
 568                git_zstream stream;
 569                int ret;
 570
 571                git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 572                gzip_size = git_deflate_bound(&stream, rpc->len);
 573                gzip_body = xmalloc(gzip_size);
 574
 575                stream.next_in = (unsigned char *)rpc->buf;
 576                stream.avail_in = rpc->len;
 577                stream.next_out = (unsigned char *)gzip_body;
 578                stream.avail_out = gzip_size;
 579
 580                ret = git_deflate(&stream, Z_FINISH);
 581                if (ret != Z_STREAM_END)
 582                        die("cannot deflate request; zlib deflate error %d", ret);
 583
 584                ret = git_deflate_end_gently(&stream);
 585                if (ret != Z_OK)
 586                        die("cannot deflate request; zlib end error %d", ret);
 587
 588                gzip_size = stream.total_out;
 589
 590                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 591                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 592                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 593
 594                if (options.verbosity > 1) {
 595                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 596                                rpc->service_name,
 597                                (unsigned long)rpc->len, (unsigned long)gzip_size);
 598                        fflush(stderr);
 599                }
 600        } else {
 601                /* We know the complete request size in advance, use the
 602                 * more normal Content-Length approach.
 603                 */
 604                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 605                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 606                if (options.verbosity > 1) {
 607                        fprintf(stderr, "POST %s (%lu bytes)\n",
 608                                rpc->service_name, (unsigned long)rpc->len);
 609                        fflush(stderr);
 610                }
 611        }
 612
 613        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 614        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 615        curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 616
 617        err = run_slot(slot, NULL);
 618        if (err == HTTP_REAUTH && !large_request) {
 619                credential_fill(&http_auth);
 620                goto retry;
 621        }
 622        if (err != HTTP_OK)
 623                err = -1;
 624
 625        curl_slist_free_all(headers);
 626        free(gzip_body);
 627        return err;
 628}
 629
 630static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 631{
 632        const char *svc = rpc->service_name;
 633        struct strbuf buf = STRBUF_INIT;
 634        struct strbuf *preamble = rpc->stdin_preamble;
 635        struct child_process client = CHILD_PROCESS_INIT;
 636        int err = 0;
 637
 638        client.in = -1;
 639        client.out = -1;
 640        client.git_cmd = 1;
 641        client.argv = rpc->argv;
 642        if (start_command(&client))
 643                exit(1);
 644        if (preamble)
 645                write_or_die(client.in, preamble->buf, preamble->len);
 646        if (heads)
 647                write_or_die(client.in, heads->buf, heads->len);
 648
 649        rpc->alloc = http_post_buffer;
 650        rpc->buf = xmalloc(rpc->alloc);
 651        rpc->in = client.in;
 652        rpc->out = client.out;
 653        strbuf_init(&rpc->result, 0);
 654
 655        strbuf_addf(&buf, "%s%s", url.buf, svc);
 656        rpc->service_url = strbuf_detach(&buf, NULL);
 657
 658        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 659        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 660
 661        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 662        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 663
 664        while (!err) {
 665                int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 666                if (!n)
 667                        break;
 668                rpc->pos = 0;
 669                rpc->len = n;
 670                err |= post_rpc(rpc);
 671        }
 672
 673        close(client.in);
 674        client.in = -1;
 675        if (!err) {
 676                strbuf_read(&rpc->result, client.out, 0);
 677        } else {
 678                char buf[4096];
 679                for (;;)
 680                        if (xread(client.out, buf, sizeof(buf)) <= 0)
 681                                break;
 682        }
 683
 684        close(client.out);
 685        client.out = -1;
 686
 687        err |= finish_command(&client);
 688        free(rpc->service_url);
 689        free(rpc->hdr_content_type);
 690        free(rpc->hdr_accept);
 691        free(rpc->buf);
 692        strbuf_release(&buf);
 693        return err;
 694}
 695
 696static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 697{
 698        struct walker *walker;
 699        char **targets = xmalloc(nr_heads * sizeof(char*));
 700        int ret, i;
 701
 702        if (options.depth)
 703                die("dumb http transport does not support --depth");
 704        for (i = 0; i < nr_heads; i++)
 705                targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
 706
 707        walker = get_http_walker(url.buf);
 708        walker->get_all = 1;
 709        walker->get_tree = 1;
 710        walker->get_history = 1;
 711        walker->get_verbosely = options.verbosity >= 3;
 712        walker->get_recover = 0;
 713        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 714        walker_free(walker);
 715
 716        for (i = 0; i < nr_heads; i++)
 717                free(targets[i]);
 718        free(targets);
 719
 720        return ret ? error("fetch failed.") : 0;
 721}
 722
 723static int fetch_git(struct discovery *heads,
 724        int nr_heads, struct ref **to_fetch)
 725{
 726        struct rpc_state rpc;
 727        struct strbuf preamble = STRBUF_INIT;
 728        char *depth_arg = NULL;
 729        int argc = 0, i, err;
 730        const char *argv[17];
 731
 732        argv[argc++] = "fetch-pack";
 733        argv[argc++] = "--stateless-rpc";
 734        argv[argc++] = "--stdin";
 735        argv[argc++] = "--lock-pack";
 736        if (options.followtags)
 737                argv[argc++] = "--include-tag";
 738        if (options.thin)
 739                argv[argc++] = "--thin";
 740        if (options.verbosity >= 3) {
 741                argv[argc++] = "-v";
 742                argv[argc++] = "-v";
 743        }
 744        if (options.check_self_contained_and_connected)
 745                argv[argc++] = "--check-self-contained-and-connected";
 746        if (options.cloning)
 747                argv[argc++] = "--cloning";
 748        if (options.update_shallow)
 749                argv[argc++] = "--update-shallow";
 750        if (!options.progress)
 751                argv[argc++] = "--no-progress";
 752        if (options.depth) {
 753                struct strbuf buf = STRBUF_INIT;
 754                strbuf_addf(&buf, "--depth=%lu", options.depth);
 755                depth_arg = strbuf_detach(&buf, NULL);
 756                argv[argc++] = depth_arg;
 757        }
 758        argv[argc++] = url.buf;
 759        argv[argc++] = NULL;
 760
 761        for (i = 0; i < nr_heads; i++) {
 762                struct ref *ref = to_fetch[i];
 763                if (!*ref->name)
 764                        die("cannot fetch by sha1 over smart http");
 765                packet_buf_write(&preamble, "%s %s\n",
 766                                 oid_to_hex(&ref->old_oid), ref->name);
 767        }
 768        packet_buf_flush(&preamble);
 769
 770        memset(&rpc, 0, sizeof(rpc));
 771        rpc.service_name = "git-upload-pack",
 772        rpc.argv = argv;
 773        rpc.stdin_preamble = &preamble;
 774        rpc.gzip_request = 1;
 775
 776        err = rpc_service(&rpc, heads);
 777        if (rpc.result.len)
 778                write_or_die(1, rpc.result.buf, rpc.result.len);
 779        strbuf_release(&rpc.result);
 780        strbuf_release(&preamble);
 781        free(depth_arg);
 782        return err;
 783}
 784
 785static int fetch(int nr_heads, struct ref **to_fetch)
 786{
 787        struct discovery *d = discover_refs("git-upload-pack", 0);
 788        if (d->proto_git)
 789                return fetch_git(d, nr_heads, to_fetch);
 790        else
 791                return fetch_dumb(nr_heads, to_fetch);
 792}
 793
 794static void parse_fetch(struct strbuf *buf)
 795{
 796        struct ref **to_fetch = NULL;
 797        struct ref *list_head = NULL;
 798        struct ref **list = &list_head;
 799        int alloc_heads = 0, nr_heads = 0;
 800
 801        do {
 802                const char *p;
 803                if (skip_prefix(buf->buf, "fetch ", &p)) {
 804                        const char *name;
 805                        struct ref *ref;
 806                        struct object_id old_oid;
 807
 808                        if (get_oid_hex(p, &old_oid))
 809                                die("protocol error: expected sha/ref, got %s'", p);
 810                        if (p[GIT_SHA1_HEXSZ] == ' ')
 811                                name = p + GIT_SHA1_HEXSZ + 1;
 812                        else if (!p[GIT_SHA1_HEXSZ])
 813                                name = "";
 814                        else
 815                                die("protocol error: expected sha/ref, got %s'", p);
 816
 817                        ref = alloc_ref(name);
 818                        oidcpy(&ref->old_oid, &old_oid);
 819
 820                        *list = ref;
 821                        list = &ref->next;
 822
 823                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 824                        to_fetch[nr_heads++] = ref;
 825                }
 826                else
 827                        die("http transport does not support %s", buf->buf);
 828
 829                strbuf_reset(buf);
 830                if (strbuf_getline_lf(buf, stdin) == EOF)
 831                        return;
 832                if (!*buf->buf)
 833                        break;
 834        } while (1);
 835
 836        if (fetch(nr_heads, to_fetch))
 837                exit(128); /* error already reported */
 838        free_refs(list_head);
 839        free(to_fetch);
 840
 841        printf("\n");
 842        fflush(stdout);
 843        strbuf_reset(buf);
 844}
 845
 846static int push_dav(int nr_spec, char **specs)
 847{
 848        const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 849        int argc = 0, i;
 850
 851        argv[argc++] = "http-push";
 852        argv[argc++] = "--helper-status";
 853        if (options.dry_run)
 854                argv[argc++] = "--dry-run";
 855        if (options.verbosity > 1)
 856                argv[argc++] = "--verbose";
 857        argv[argc++] = url.buf;
 858        for (i = 0; i < nr_spec; i++)
 859                argv[argc++] = specs[i];
 860        argv[argc++] = NULL;
 861
 862        if (run_command_v_opt(argv, RUN_GIT_CMD))
 863                die("git-%s failed", argv[0]);
 864        free(argv);
 865        return 0;
 866}
 867
 868static int push_git(struct discovery *heads, int nr_spec, char **specs)
 869{
 870        struct rpc_state rpc;
 871        int i, err;
 872        struct argv_array args;
 873        struct string_list_item *cas_option;
 874        struct strbuf preamble = STRBUF_INIT;
 875
 876        argv_array_init(&args);
 877        argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 878                         NULL);
 879
 880        if (options.thin)
 881                argv_array_push(&args, "--thin");
 882        if (options.dry_run)
 883                argv_array_push(&args, "--dry-run");
 884        if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
 885                argv_array_push(&args, "--signed=yes");
 886        else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
 887                argv_array_push(&args, "--signed=if-asked");
 888        if (options.verbosity == 0)
 889                argv_array_push(&args, "--quiet");
 890        else if (options.verbosity > 1)
 891                argv_array_push(&args, "--verbose");
 892        argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 893        for_each_string_list_item(cas_option, &cas_options)
 894                argv_array_push(&args, cas_option->string);
 895        argv_array_push(&args, url.buf);
 896
 897        argv_array_push(&args, "--stdin");
 898        for (i = 0; i < nr_spec; i++)
 899                packet_buf_write(&preamble, "%s\n", specs[i]);
 900        packet_buf_flush(&preamble);
 901
 902        memset(&rpc, 0, sizeof(rpc));
 903        rpc.service_name = "git-receive-pack",
 904        rpc.argv = args.argv;
 905        rpc.stdin_preamble = &preamble;
 906
 907        err = rpc_service(&rpc, heads);
 908        if (rpc.result.len)
 909                write_or_die(1, rpc.result.buf, rpc.result.len);
 910        strbuf_release(&rpc.result);
 911        strbuf_release(&preamble);
 912        argv_array_clear(&args);
 913        return err;
 914}
 915
 916static int push(int nr_spec, char **specs)
 917{
 918        struct discovery *heads = discover_refs("git-receive-pack", 1);
 919        int ret;
 920
 921        if (heads->proto_git)
 922                ret = push_git(heads, nr_spec, specs);
 923        else
 924                ret = push_dav(nr_spec, specs);
 925        free_discovery(heads);
 926        return ret;
 927}
 928
 929static void parse_push(struct strbuf *buf)
 930{
 931        char **specs = NULL;
 932        int alloc_spec = 0, nr_spec = 0, i, ret;
 933
 934        do {
 935                if (starts_with(buf->buf, "push ")) {
 936                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 937                        specs[nr_spec++] = xstrdup(buf->buf + 5);
 938                }
 939                else
 940                        die("http transport does not support %s", buf->buf);
 941
 942                strbuf_reset(buf);
 943                if (strbuf_getline_lf(buf, stdin) == EOF)
 944                        goto free_specs;
 945                if (!*buf->buf)
 946                        break;
 947        } while (1);
 948
 949        ret = push(nr_spec, specs);
 950        printf("\n");
 951        fflush(stdout);
 952
 953        if (ret)
 954                exit(128); /* error already reported */
 955
 956 free_specs:
 957        for (i = 0; i < nr_spec; i++)
 958                free(specs[i]);
 959        free(specs);
 960}
 961
 962int main(int argc, const char **argv)
 963{
 964        struct strbuf buf = STRBUF_INIT;
 965        int nongit;
 966
 967        git_setup_gettext();
 968
 969        git_extract_argv0_path(argv[0]);
 970        setup_git_directory_gently(&nongit);
 971        if (argc < 2) {
 972                error("remote-curl: usage: git remote-curl <remote> [<url>]");
 973                return 1;
 974        }
 975
 976        options.verbosity = 1;
 977        options.progress = !!isatty(2);
 978        options.thin = 1;
 979
 980        remote = remote_get(argv[1]);
 981
 982        if (argc > 2) {
 983                end_url_with_slash(&url, argv[2]);
 984        } else {
 985                end_url_with_slash(&url, remote->url[0]);
 986        }
 987
 988        http_init(remote, url.buf, 0);
 989
 990        do {
 991                const char *arg;
 992
 993                if (strbuf_getline_lf(&buf, stdin) == EOF) {
 994                        if (ferror(stdin))
 995                                error("remote-curl: error reading command stream from git");
 996                        return 1;
 997                }
 998                if (buf.len == 0)
 999                        break;
1000                if (starts_with(buf.buf, "fetch ")) {
1001                        if (nongit)
1002                                die("remote-curl: fetch attempted without a local repo");
1003                        parse_fetch(&buf);
1004
1005                } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1006                        int for_push = !!strstr(buf.buf + 4, "for-push");
1007                        output_refs(get_refs(for_push));
1008
1009                } else if (starts_with(buf.buf, "push ")) {
1010                        parse_push(&buf);
1011
1012                } else if (skip_prefix(buf.buf, "option ", &arg)) {
1013                        char *value = strchr(arg, ' ');
1014                        int result;
1015
1016                        if (value)
1017                                *value++ = '\0';
1018                        else
1019                                value = "true";
1020
1021                        result = set_option(arg, value);
1022                        if (!result)
1023                                printf("ok\n");
1024                        else if (result < 0)
1025                                printf("error invalid value\n");
1026                        else
1027                                printf("unsupported\n");
1028                        fflush(stdout);
1029
1030                } else if (!strcmp(buf.buf, "capabilities")) {
1031                        printf("fetch\n");
1032                        printf("option\n");
1033                        printf("push\n");
1034                        printf("check-connectivity\n");
1035                        printf("\n");
1036                        fflush(stdout);
1037                } else {
1038                        error("remote-curl: unknown command '%s' from git", buf.buf);
1039                        return 1;
1040                }
1041                strbuf_reset(&buf);
1042        } while (1);
1043
1044        http_cleanup();
1045
1046        return 0;
1047}