Andrew's git / gitweb.git / remote-curl.c
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remote-curl.con commit upload-pack: add get_reachable_list() (079aa97)
   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};
  35static struct options options;
  36static struct string_list cas_options = STRING_LIST_INIT_DUP;
  37
  38static int set_option(const char *name, const char *value)
  39{
  40        if (!strcmp(name, "verbosity")) {
  41                char *end;
  42                int v = strtol(value, &end, 10);
  43                if (value == end || *end)
  44                        return -1;
  45                options.verbosity = v;
  46                return 0;
  47        }
  48        else if (!strcmp(name, "progress")) {
  49                if (!strcmp(value, "true"))
  50                        options.progress = 1;
  51                else if (!strcmp(value, "false"))
  52                        options.progress = 0;
  53                else
  54                        return -1;
  55                return 0;
  56        }
  57        else if (!strcmp(name, "depth")) {
  58                char *end;
  59                unsigned long v = strtoul(value, &end, 10);
  60                if (value == end || *end)
  61                        return -1;
  62                options.depth = v;
  63                return 0;
  64        }
  65        else if (!strcmp(name, "deepen-since")) {
  66                options.deepen_since = xstrdup(value);
  67                return 0;
  68        }
  69        else if (!strcmp(name, "deepen-not")) {
  70                string_list_append(&options.deepen_not, value);
  71                return 0;
  72        }
  73        else if (!strcmp(name, "followtags")) {
  74                if (!strcmp(value, "true"))
  75                        options.followtags = 1;
  76                else if (!strcmp(value, "false"))
  77                        options.followtags = 0;
  78                else
  79                        return -1;
  80                return 0;
  81        }
  82        else if (!strcmp(name, "dry-run")) {
  83                if (!strcmp(value, "true"))
  84                        options.dry_run = 1;
  85                else if (!strcmp(value, "false"))
  86                        options.dry_run = 0;
  87                else
  88                        return -1;
  89                return 0;
  90        }
  91        else if (!strcmp(name, "check-connectivity")) {
  92                if (!strcmp(value, "true"))
  93                        options.check_self_contained_and_connected = 1;
  94                else if (!strcmp(value, "false"))
  95                        options.check_self_contained_and_connected = 0;
  96                else
  97                        return -1;
  98                return 0;
  99        }
 100        else if (!strcmp(name, "cas")) {
 101                struct strbuf val = STRBUF_INIT;
 102                strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
 103                string_list_append(&cas_options, val.buf);
 104                strbuf_release(&val);
 105                return 0;
 106        } else if (!strcmp(name, "cloning")) {
 107                if (!strcmp(value, "true"))
 108                        options.cloning = 1;
 109                else if (!strcmp(value, "false"))
 110                        options.cloning = 0;
 111                else
 112                        return -1;
 113                return 0;
 114        } else if (!strcmp(name, "update-shallow")) {
 115                if (!strcmp(value, "true"))
 116                        options.update_shallow = 1;
 117                else if (!strcmp(value, "false"))
 118                        options.update_shallow = 0;
 119                else
 120                        return -1;
 121                return 0;
 122        } else if (!strcmp(name, "pushcert")) {
 123                if (!strcmp(value, "true"))
 124                        options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 125                else if (!strcmp(value, "false"))
 126                        options.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 127                else if (!strcmp(value, "if-asked"))
 128                        options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 129                else
 130                        return -1;
 131                return 0;
 132        } else {
 133                return 1 /* unsupported */;
 134        }
 135}
 136
 137struct discovery {
 138        const char *service;
 139        char *buf_alloc;
 140        char *buf;
 141        size_t len;
 142        struct ref *refs;
 143        struct sha1_array shallow;
 144        unsigned proto_git : 1;
 145};
 146static struct discovery *last_discovery;
 147
 148static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 149{
 150        struct ref *list = NULL;
 151        get_remote_heads(-1, heads->buf, heads->len, &list,
 152                         for_push ? REF_NORMAL : 0, NULL, &heads->shallow);
 153        return list;
 154}
 155
 156static struct ref *parse_info_refs(struct discovery *heads)
 157{
 158        char *data, *start, *mid;
 159        char *ref_name;
 160        int i = 0;
 161
 162        struct ref *refs = NULL;
 163        struct ref *ref = NULL;
 164        struct ref *last_ref = NULL;
 165
 166        data = heads->buf;
 167        start = NULL;
 168        mid = data;
 169        while (i < heads->len) {
 170                if (!start) {
 171                        start = &data[i];
 172                }
 173                if (data[i] == '\t')
 174                        mid = &data[i];
 175                if (data[i] == '\n') {
 176                        if (mid - start != 40)
 177                                die("%sinfo/refs not valid: is this a git repository?",
 178                                    url.buf);
 179                        data[i] = 0;
 180                        ref_name = mid + 1;
 181                        ref = alloc_ref(ref_name);
 182                        get_oid_hex(start, &ref->old_oid);
 183                        if (!refs)
 184                                refs = ref;
 185                        if (last_ref)
 186                                last_ref->next = ref;
 187                        last_ref = ref;
 188                        start = NULL;
 189                }
 190                i++;
 191        }
 192
 193        ref = alloc_ref("HEAD");
 194        if (!http_fetch_ref(url.buf, ref) &&
 195            !resolve_remote_symref(ref, refs)) {
 196                ref->next = refs;
 197                refs = ref;
 198        } else {
 199                free(ref);
 200        }
 201
 202        return refs;
 203}
 204
 205static void free_discovery(struct discovery *d)
 206{
 207        if (d) {
 208                if (d == last_discovery)
 209                        last_discovery = NULL;
 210                free(d->shallow.sha1);
 211                free(d->buf_alloc);
 212                free_refs(d->refs);
 213                free(d);
 214        }
 215}
 216
 217static int show_http_message(struct strbuf *type, struct strbuf *charset,
 218                             struct strbuf *msg)
 219{
 220        const char *p, *eol;
 221
 222        /*
 223         * We only show text/plain parts, as other types are likely
 224         * to be ugly to look at on the user's terminal.
 225         */
 226        if (strcmp(type->buf, "text/plain"))
 227                return -1;
 228        if (charset->len)
 229                strbuf_reencode(msg, charset->buf, get_log_output_encoding());
 230
 231        strbuf_trim(msg);
 232        if (!msg->len)
 233                return -1;
 234
 235        p = msg->buf;
 236        do {
 237                eol = strchrnul(p, '\n');
 238                fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 239                p = eol + 1;
 240        } while(*eol);
 241        return 0;
 242}
 243
 244static struct discovery *discover_refs(const char *service, int for_push)
 245{
 246        struct strbuf exp = STRBUF_INIT;
 247        struct strbuf type = STRBUF_INIT;
 248        struct strbuf charset = STRBUF_INIT;
 249        struct strbuf buffer = STRBUF_INIT;
 250        struct strbuf refs_url = STRBUF_INIT;
 251        struct strbuf effective_url = STRBUF_INIT;
 252        struct discovery *last = last_discovery;
 253        int http_ret, maybe_smart = 0;
 254        struct http_get_options options;
 255
 256        if (last && !strcmp(service, last->service))
 257                return last;
 258        free_discovery(last);
 259
 260        strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 261        if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 262             git_env_bool("GIT_SMART_HTTP", 1)) {
 263                maybe_smart = 1;
 264                if (!strchr(url.buf, '?'))
 265                        strbuf_addch(&refs_url, '?');
 266                else
 267                        strbuf_addch(&refs_url, '&');
 268                strbuf_addf(&refs_url, "service=%s", service);
 269        }
 270
 271        memset(&options, 0, sizeof(options));
 272        options.content_type = &type;
 273        options.charset = &charset;
 274        options.effective_url = &effective_url;
 275        options.base_url = &url;
 276        options.no_cache = 1;
 277        options.keep_error = 1;
 278
 279        http_ret = http_get_strbuf(refs_url.buf, &buffer, &options);
 280        switch (http_ret) {
 281        case HTTP_OK:
 282                break;
 283        case HTTP_MISSING_TARGET:
 284                show_http_message(&type, &charset, &buffer);
 285                die("repository '%s' not found", url.buf);
 286        case HTTP_NOAUTH:
 287                show_http_message(&type, &charset, &buffer);
 288                die("Authentication failed for '%s'", url.buf);
 289        default:
 290                show_http_message(&type, &charset, &buffer);
 291                die("unable to access '%s': %s", url.buf, curl_errorstr);
 292        }
 293
 294        last= xcalloc(1, sizeof(*last_discovery));
 295        last->service = service;
 296        last->buf_alloc = strbuf_detach(&buffer, &last->len);
 297        last->buf = last->buf_alloc;
 298
 299        strbuf_addf(&exp, "application/x-%s-advertisement", service);
 300        if (maybe_smart &&
 301            (5 <= last->len && last->buf[4] == '#') &&
 302            !strbuf_cmp(&exp, &type)) {
 303                char *line;
 304
 305                /*
 306                 * smart HTTP response; validate that the service
 307                 * pkt-line matches our request.
 308                 */
 309                line = packet_read_line_buf(&last->buf, &last->len, NULL);
 310
 311                strbuf_reset(&exp);
 312                strbuf_addf(&exp, "# service=%s", service);
 313                if (strcmp(line, exp.buf))
 314                        die("invalid server response; got '%s'", line);
 315                strbuf_release(&exp);
 316
 317                /* The header can include additional metadata lines, up
 318                 * until a packet flush marker.  Ignore these now, but
 319                 * in the future we might start to scan them.
 320                 */
 321                while (packet_read_line_buf(&last->buf, &last->len, NULL))
 322                        ;
 323
 324                last->proto_git = 1;
 325        }
 326
 327        if (last->proto_git)
 328                last->refs = parse_git_refs(last, for_push);
 329        else
 330                last->refs = parse_info_refs(last);
 331
 332        strbuf_release(&refs_url);
 333        strbuf_release(&exp);
 334        strbuf_release(&type);
 335        strbuf_release(&charset);
 336        strbuf_release(&effective_url);
 337        strbuf_release(&buffer);
 338        last_discovery = last;
 339        return last;
 340}
 341
 342static struct ref *get_refs(int for_push)
 343{
 344        struct discovery *heads;
 345
 346        if (for_push)
 347                heads = discover_refs("git-receive-pack", for_push);
 348        else
 349                heads = discover_refs("git-upload-pack", for_push);
 350
 351        return heads->refs;
 352}
 353
 354static void output_refs(struct ref *refs)
 355{
 356        struct ref *posn;
 357        for (posn = refs; posn; posn = posn->next) {
 358                if (posn->symref)
 359                        printf("@%s %s\n", posn->symref, posn->name);
 360                else
 361                        printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name);
 362        }
 363        printf("\n");
 364        fflush(stdout);
 365}
 366
 367struct rpc_state {
 368        const char *service_name;
 369        const char **argv;
 370        struct strbuf *stdin_preamble;
 371        char *service_url;
 372        char *hdr_content_type;
 373        char *hdr_accept;
 374        char *buf;
 375        size_t alloc;
 376        size_t len;
 377        size_t pos;
 378        int in;
 379        int out;
 380        struct strbuf result;
 381        unsigned gzip_request : 1;
 382        unsigned initial_buffer : 1;
 383};
 384
 385static size_t rpc_out(void *ptr, size_t eltsize,
 386                size_t nmemb, void *buffer_)
 387{
 388        size_t max = eltsize * nmemb;
 389        struct rpc_state *rpc = buffer_;
 390        size_t avail = rpc->len - rpc->pos;
 391
 392        if (!avail) {
 393                rpc->initial_buffer = 0;
 394                avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 395                if (!avail)
 396                        return 0;
 397                rpc->pos = 0;
 398                rpc->len = avail;
 399        }
 400
 401        if (max < avail)
 402                avail = max;
 403        memcpy(ptr, rpc->buf + rpc->pos, avail);
 404        rpc->pos += avail;
 405        return avail;
 406}
 407
 408#ifndef NO_CURL_IOCTL
 409static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 410{
 411        struct rpc_state *rpc = clientp;
 412
 413        switch (cmd) {
 414        case CURLIOCMD_NOP:
 415                return CURLIOE_OK;
 416
 417        case CURLIOCMD_RESTARTREAD:
 418                if (rpc->initial_buffer) {
 419                        rpc->pos = 0;
 420                        return CURLIOE_OK;
 421                }
 422                error("unable to rewind rpc post data - try increasing http.postBuffer");
 423                return CURLIOE_FAILRESTART;
 424
 425        default:
 426                return CURLIOE_UNKNOWNCMD;
 427        }
 428}
 429#endif
 430
 431static size_t rpc_in(char *ptr, size_t eltsize,
 432                size_t nmemb, void *buffer_)
 433{
 434        size_t size = eltsize * nmemb;
 435        struct rpc_state *rpc = buffer_;
 436        write_or_die(rpc->in, ptr, size);
 437        return size;
 438}
 439
 440static int run_slot(struct active_request_slot *slot,
 441                    struct slot_results *results)
 442{
 443        int err;
 444        struct slot_results results_buf;
 445
 446        if (!results)
 447                results = &results_buf;
 448
 449        err = run_one_slot(slot, results);
 450
 451        if (err != HTTP_OK && err != HTTP_REAUTH) {
 452                error("RPC failed; result=%d, HTTP code = %ld",
 453                      results->curl_result, results->http_code);
 454        }
 455
 456        return err;
 457}
 458
 459static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 460{
 461        struct active_request_slot *slot;
 462        struct curl_slist *headers = NULL;
 463        struct strbuf buf = STRBUF_INIT;
 464        int err;
 465
 466        slot = get_active_slot();
 467
 468        headers = curl_slist_append(headers, rpc->hdr_content_type);
 469        headers = curl_slist_append(headers, rpc->hdr_accept);
 470
 471        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 472        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 473        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 474        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 475        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 476        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 477        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 478        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 479        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 480
 481        err = run_slot(slot, results);
 482
 483        curl_slist_free_all(headers);
 484        strbuf_release(&buf);
 485        return err;
 486}
 487
 488static int post_rpc(struct rpc_state *rpc)
 489{
 490        struct active_request_slot *slot;
 491        struct curl_slist *headers = NULL;
 492        int use_gzip = rpc->gzip_request;
 493        char *gzip_body = NULL;
 494        size_t gzip_size = 0;
 495        int err, large_request = 0;
 496        int needs_100_continue = 0;
 497
 498        /* Try to load the entire request, if we can fit it into the
 499         * allocated buffer space we can use HTTP/1.0 and avoid the
 500         * chunked encoding mess.
 501         */
 502        while (1) {
 503                size_t left = rpc->alloc - rpc->len;
 504                char *buf = rpc->buf + rpc->len;
 505                int n;
 506
 507                if (left < LARGE_PACKET_MAX) {
 508                        large_request = 1;
 509                        use_gzip = 0;
 510                        break;
 511                }
 512
 513                n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 514                if (!n)
 515                        break;
 516                rpc->len += n;
 517        }
 518
 519        if (large_request) {
 520                struct slot_results results;
 521
 522                do {
 523                        err = probe_rpc(rpc, &results);
 524                        if (err == HTTP_REAUTH)
 525                                credential_fill(&http_auth);
 526                } while (err == HTTP_REAUTH);
 527                if (err != HTTP_OK)
 528                        return -1;
 529
 530                if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 531                        needs_100_continue = 1;
 532        }
 533
 534        headers = curl_slist_append(headers, rpc->hdr_content_type);
 535        headers = curl_slist_append(headers, rpc->hdr_accept);
 536        headers = curl_slist_append(headers, needs_100_continue ?
 537                "Expect: 100-continue" : "Expect:");
 538
 539retry:
 540        slot = get_active_slot();
 541
 542        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 543        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 544        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 545        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 546
 547        if (large_request) {
 548                /* The request body is large and the size cannot be predicted.
 549                 * We must use chunked encoding to send it.
 550                 */
 551                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 552                rpc->initial_buffer = 1;
 553                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 554                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 555#ifndef NO_CURL_IOCTL
 556                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 557                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 558#endif
 559                if (options.verbosity > 1) {
 560                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 561                        fflush(stderr);
 562                }
 563
 564        } else if (gzip_body) {
 565                /*
 566                 * If we are looping to retry authentication, then the previous
 567                 * run will have set up the headers and gzip buffer already,
 568                 * and we just need to send it.
 569                 */
 570                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 571                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 572
 573        } else if (use_gzip && 1024 < rpc->len) {
 574                /* The client backend isn't giving us compressed data so
 575                 * we can try to deflate it ourselves, this may save on.
 576                 * the transfer time.
 577                 */
 578                git_zstream stream;
 579                int ret;
 580
 581                git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 582                gzip_size = git_deflate_bound(&stream, rpc->len);
 583                gzip_body = xmalloc(gzip_size);
 584
 585                stream.next_in = (unsigned char *)rpc->buf;
 586                stream.avail_in = rpc->len;
 587                stream.next_out = (unsigned char *)gzip_body;
 588                stream.avail_out = gzip_size;
 589
 590                ret = git_deflate(&stream, Z_FINISH);
 591                if (ret != Z_STREAM_END)
 592                        die("cannot deflate request; zlib deflate error %d", ret);
 593
 594                ret = git_deflate_end_gently(&stream);
 595                if (ret != Z_OK)
 596                        die("cannot deflate request; zlib end error %d", ret);
 597
 598                gzip_size = stream.total_out;
 599
 600                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 601                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 602                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 603
 604                if (options.verbosity > 1) {
 605                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 606                                rpc->service_name,
 607                                (unsigned long)rpc->len, (unsigned long)gzip_size);
 608                        fflush(stderr);
 609                }
 610        } else {
 611                /* We know the complete request size in advance, use the
 612                 * more normal Content-Length approach.
 613                 */
 614                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 615                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 616                if (options.verbosity > 1) {
 617                        fprintf(stderr, "POST %s (%lu bytes)\n",
 618                                rpc->service_name, (unsigned long)rpc->len);
 619                        fflush(stderr);
 620                }
 621        }
 622
 623        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 624        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 625        curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 626
 627        err = run_slot(slot, NULL);
 628        if (err == HTTP_REAUTH && !large_request) {
 629                credential_fill(&http_auth);
 630                goto retry;
 631        }
 632        if (err != HTTP_OK)
 633                err = -1;
 634
 635        curl_slist_free_all(headers);
 636        free(gzip_body);
 637        return err;
 638}
 639
 640static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 641{
 642        const char *svc = rpc->service_name;
 643        struct strbuf buf = STRBUF_INIT;
 644        struct strbuf *preamble = rpc->stdin_preamble;
 645        struct child_process client = CHILD_PROCESS_INIT;
 646        int err = 0;
 647
 648        client.in = -1;
 649        client.out = -1;
 650        client.git_cmd = 1;
 651        client.argv = rpc->argv;
 652        if (start_command(&client))
 653                exit(1);
 654        if (preamble)
 655                write_or_die(client.in, preamble->buf, preamble->len);
 656        if (heads)
 657                write_or_die(client.in, heads->buf, heads->len);
 658
 659        rpc->alloc = http_post_buffer;
 660        rpc->buf = xmalloc(rpc->alloc);
 661        rpc->in = client.in;
 662        rpc->out = client.out;
 663        strbuf_init(&rpc->result, 0);
 664
 665        strbuf_addf(&buf, "%s%s", url.buf, svc);
 666        rpc->service_url = strbuf_detach(&buf, NULL);
 667
 668        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 669        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 670
 671        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 672        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 673
 674        while (!err) {
 675                int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 676                if (!n)
 677                        break;
 678                rpc->pos = 0;
 679                rpc->len = n;
 680                err |= post_rpc(rpc);
 681        }
 682
 683        close(client.in);
 684        client.in = -1;
 685        if (!err) {
 686                strbuf_read(&rpc->result, client.out, 0);
 687        } else {
 688                char buf[4096];
 689                for (;;)
 690                        if (xread(client.out, buf, sizeof(buf)) <= 0)
 691                                break;
 692        }
 693
 694        close(client.out);
 695        client.out = -1;
 696
 697        err |= finish_command(&client);
 698        free(rpc->service_url);
 699        free(rpc->hdr_content_type);
 700        free(rpc->hdr_accept);
 701        free(rpc->buf);
 702        strbuf_release(&buf);
 703        return err;
 704}
 705
 706static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 707{
 708        struct walker *walker;
 709        char **targets = xmalloc(nr_heads * sizeof(char*));
 710        int ret, i;
 711
 712        if (options.depth || options.deepen_since)
 713                die("dumb http transport does not support shallow capabilities");
 714        for (i = 0; i < nr_heads; i++)
 715                targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
 716
 717        walker = get_http_walker(url.buf);
 718        walker->get_all = 1;
 719        walker->get_tree = 1;
 720        walker->get_history = 1;
 721        walker->get_verbosely = options.verbosity >= 3;
 722        walker->get_recover = 0;
 723        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 724        walker_free(walker);
 725
 726        for (i = 0; i < nr_heads; i++)
 727                free(targets[i]);
 728        free(targets);
 729
 730        return ret ? error("fetch failed.") : 0;
 731}
 732
 733static int fetch_git(struct discovery *heads,
 734        int nr_heads, struct ref **to_fetch)
 735{
 736        struct rpc_state rpc;
 737        struct strbuf preamble = STRBUF_INIT;
 738        int i, err;
 739        struct argv_array args = ARGV_ARRAY_INIT;
 740
 741        argv_array_pushl(&args, "fetch-pack", "--stateless-rpc",
 742                         "--stdin", "--lock-pack", NULL);
 743        if (options.followtags)
 744                argv_array_push(&args, "--include-tag");
 745        if (options.thin)
 746                argv_array_push(&args, "--thin");
 747        if (options.verbosity >= 3)
 748                argv_array_pushl(&args, "-v", "-v", NULL);
 749        if (options.check_self_contained_and_connected)
 750                argv_array_push(&args, "--check-self-contained-and-connected");
 751        if (options.cloning)
 752                argv_array_push(&args, "--cloning");
 753        if (options.update_shallow)
 754                argv_array_push(&args, "--update-shallow");
 755        if (!options.progress)
 756                argv_array_push(&args, "--no-progress");
 757        if (options.depth)
 758                argv_array_pushf(&args, "--depth=%lu", options.depth);
 759        if (options.deepen_since)
 760                argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since);
 761        for (i = 0; i < options.deepen_not.nr; i++)
 762                argv_array_pushf(&args, "--shallow-exclude=%s",
 763                                 options.deepen_not.items[i].string);
 764        argv_array_push(&args, url.buf);
 765
 766        for (i = 0; i < nr_heads; i++) {
 767                struct ref *ref = to_fetch[i];
 768                if (!*ref->name)
 769                        die("cannot fetch by sha1 over smart http");
 770                packet_buf_write(&preamble, "%s %s\n",
 771                                 oid_to_hex(&ref->old_oid), ref->name);
 772        }
 773        packet_buf_flush(&preamble);
 774
 775        memset(&rpc, 0, sizeof(rpc));
 776        rpc.service_name = "git-upload-pack",
 777        rpc.argv = args.argv;
 778        rpc.stdin_preamble = &preamble;
 779        rpc.gzip_request = 1;
 780
 781        err = rpc_service(&rpc, heads);
 782        if (rpc.result.len)
 783                write_or_die(1, rpc.result.buf, rpc.result.len);
 784        strbuf_release(&rpc.result);
 785        strbuf_release(&preamble);
 786        argv_array_clear(&args);
 787        return err;
 788}
 789
 790static int fetch(int nr_heads, struct ref **to_fetch)
 791{
 792        struct discovery *d = discover_refs("git-upload-pack", 0);
 793        if (d->proto_git)
 794                return fetch_git(d, nr_heads, to_fetch);
 795        else
 796                return fetch_dumb(nr_heads, to_fetch);
 797}
 798
 799static void parse_fetch(struct strbuf *buf)
 800{
 801        struct ref **to_fetch = NULL;
 802        struct ref *list_head = NULL;
 803        struct ref **list = &list_head;
 804        int alloc_heads = 0, nr_heads = 0;
 805
 806        do {
 807                const char *p;
 808                if (skip_prefix(buf->buf, "fetch ", &p)) {
 809                        const char *name;
 810                        struct ref *ref;
 811                        struct object_id old_oid;
 812
 813                        if (get_oid_hex(p, &old_oid))
 814                                die("protocol error: expected sha/ref, got %s'", p);
 815                        if (p[GIT_SHA1_HEXSZ] == ' ')
 816                                name = p + GIT_SHA1_HEXSZ + 1;
 817                        else if (!p[GIT_SHA1_HEXSZ])
 818                                name = "";
 819                        else
 820                                die("protocol error: expected sha/ref, got %s'", p);
 821
 822                        ref = alloc_ref(name);
 823                        oidcpy(&ref->old_oid, &old_oid);
 824
 825                        *list = ref;
 826                        list = &ref->next;
 827
 828                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 829                        to_fetch[nr_heads++] = ref;
 830                }
 831                else
 832                        die("http transport does not support %s", buf->buf);
 833
 834                strbuf_reset(buf);
 835                if (strbuf_getline_lf(buf, stdin) == EOF)
 836                        return;
 837                if (!*buf->buf)
 838                        break;
 839        } while (1);
 840
 841        if (fetch(nr_heads, to_fetch))
 842                exit(128); /* error already reported */
 843        free_refs(list_head);
 844        free(to_fetch);
 845
 846        printf("\n");
 847        fflush(stdout);
 848        strbuf_reset(buf);
 849}
 850
 851static int push_dav(int nr_spec, char **specs)
 852{
 853        const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 854        int argc = 0, i;
 855
 856        argv[argc++] = "http-push";
 857        argv[argc++] = "--helper-status";
 858        if (options.dry_run)
 859                argv[argc++] = "--dry-run";
 860        if (options.verbosity > 1)
 861                argv[argc++] = "--verbose";
 862        argv[argc++] = url.buf;
 863        for (i = 0; i < nr_spec; i++)
 864                argv[argc++] = specs[i];
 865        argv[argc++] = NULL;
 866
 867        if (run_command_v_opt(argv, RUN_GIT_CMD))
 868                die("git-%s failed", argv[0]);
 869        free(argv);
 870        return 0;
 871}
 872
 873static int push_git(struct discovery *heads, int nr_spec, char **specs)
 874{
 875        struct rpc_state rpc;
 876        int i, err;
 877        struct argv_array args;
 878        struct string_list_item *cas_option;
 879        struct strbuf preamble = STRBUF_INIT;
 880
 881        argv_array_init(&args);
 882        argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 883                         NULL);
 884
 885        if (options.thin)
 886                argv_array_push(&args, "--thin");
 887        if (options.dry_run)
 888                argv_array_push(&args, "--dry-run");
 889        if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
 890                argv_array_push(&args, "--signed=yes");
 891        else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
 892                argv_array_push(&args, "--signed=if-asked");
 893        if (options.verbosity == 0)
 894                argv_array_push(&args, "--quiet");
 895        else if (options.verbosity > 1)
 896                argv_array_push(&args, "--verbose");
 897        argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 898        for_each_string_list_item(cas_option, &cas_options)
 899                argv_array_push(&args, cas_option->string);
 900        argv_array_push(&args, url.buf);
 901
 902        argv_array_push(&args, "--stdin");
 903        for (i = 0; i < nr_spec; i++)
 904                packet_buf_write(&preamble, "%s\n", specs[i]);
 905        packet_buf_flush(&preamble);
 906
 907        memset(&rpc, 0, sizeof(rpc));
 908        rpc.service_name = "git-receive-pack",
 909        rpc.argv = args.argv;
 910        rpc.stdin_preamble = &preamble;
 911
 912        err = rpc_service(&rpc, heads);
 913        if (rpc.result.len)
 914                write_or_die(1, rpc.result.buf, rpc.result.len);
 915        strbuf_release(&rpc.result);
 916        strbuf_release(&preamble);
 917        argv_array_clear(&args);
 918        return err;
 919}
 920
 921static int push(int nr_spec, char **specs)
 922{
 923        struct discovery *heads = discover_refs("git-receive-pack", 1);
 924        int ret;
 925
 926        if (heads->proto_git)
 927                ret = push_git(heads, nr_spec, specs);
 928        else
 929                ret = push_dav(nr_spec, specs);
 930        free_discovery(heads);
 931        return ret;
 932}
 933
 934static void parse_push(struct strbuf *buf)
 935{
 936        char **specs = NULL;
 937        int alloc_spec = 0, nr_spec = 0, i, ret;
 938
 939        do {
 940                if (starts_with(buf->buf, "push ")) {
 941                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 942                        specs[nr_spec++] = xstrdup(buf->buf + 5);
 943                }
 944                else
 945                        die("http transport does not support %s", buf->buf);
 946
 947                strbuf_reset(buf);
 948                if (strbuf_getline_lf(buf, stdin) == EOF)
 949                        goto free_specs;
 950                if (!*buf->buf)
 951                        break;
 952        } while (1);
 953
 954        ret = push(nr_spec, specs);
 955        printf("\n");
 956        fflush(stdout);
 957
 958        if (ret)
 959                exit(128); /* error already reported */
 960
 961 free_specs:
 962        for (i = 0; i < nr_spec; i++)
 963                free(specs[i]);
 964        free(specs);
 965}
 966
 967int main(int argc, const char **argv)
 968{
 969        struct strbuf buf = STRBUF_INIT;
 970        int nongit;
 971
 972        git_setup_gettext();
 973
 974        git_extract_argv0_path(argv[0]);
 975        setup_git_directory_gently(&nongit);
 976        if (argc < 2) {
 977                error("remote-curl: usage: git remote-curl <remote> [<url>]");
 978                return 1;
 979        }
 980
 981        options.verbosity = 1;
 982        options.progress = !!isatty(2);
 983        options.thin = 1;
 984        string_list_init(&options.deepen_not, 1);
 985
 986        remote = remote_get(argv[1]);
 987
 988        if (argc > 2) {
 989                end_url_with_slash(&url, argv[2]);
 990        } else {
 991                end_url_with_slash(&url, remote->url[0]);
 992        }
 993
 994        http_init(remote, url.buf, 0);
 995
 996        do {
 997                const char *arg;
 998
 999                if (strbuf_getline_lf(&buf, stdin) == EOF) {
1000                        if (ferror(stdin))
1001                                error("remote-curl: error reading command stream from git");
1002                        return 1;
1003                }
1004                if (buf.len == 0)
1005                        break;
1006                if (starts_with(buf.buf, "fetch ")) {
1007                        if (nongit)
1008                                die("remote-curl: fetch attempted without a local repo");
1009                        parse_fetch(&buf);
1010
1011                } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1012                        int for_push = !!strstr(buf.buf + 4, "for-push");
1013                        output_refs(get_refs(for_push));
1014
1015                } else if (starts_with(buf.buf, "push ")) {
1016                        parse_push(&buf);
1017
1018                } else if (skip_prefix(buf.buf, "option ", &arg)) {
1019                        char *value = strchr(arg, ' ');
1020                        int result;
1021
1022                        if (value)
1023                                *value++ = '\0';
1024                        else
1025                                value = "true";
1026
1027                        result = set_option(arg, value);
1028                        if (!result)
1029                                printf("ok\n");
1030                        else if (result < 0)
1031                                printf("error invalid value\n");
1032                        else
1033                                printf("unsupported\n");
1034                        fflush(stdout);
1035
1036                } else if (!strcmp(buf.buf, "capabilities")) {
1037                        printf("fetch\n");
1038                        printf("option\n");
1039                        printf("push\n");
1040                        printf("check-connectivity\n");
1041                        printf("\n");
1042                        fflush(stdout);
1043                } else {
1044                        error("remote-curl: unknown command '%s' from git", buf.buf);
1045                        return 1;
1046                }
1047                strbuf_reset(&buf);
1048        } while (1);
1049
1050        http_cleanup();
1051
1052        return 0;
1053}