Andrew's git / gitweb.git / remote-curl.c
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remote-curl.con commit pathspec: small readability changes (4f1bf4d)
   1#include "cache.h"
   2#include "remote.h"
   3#include "strbuf.h"
   4#include "walker.h"
   5#include "http.h"
   6#include "exec_cmd.h"
   7#include "run-command.h"
   8#include "pkt-line.h"
   9#include "string-list.h"
  10#include "sideband.h"
  11#include "argv-array.h"
  12#include "credential.h"
  13#include "sha1-array.h"
  14#include "send-pack.h"
  15
  16static struct remote *remote;
  17/* always ends with a trailing slash */
  18static struct strbuf url = STRBUF_INIT;
  19
  20struct options {
  21        int verbosity;
  22        unsigned long depth;
  23        char *deepen_since;
  24        struct string_list deepen_not;
  25        unsigned progress : 1,
  26                check_self_contained_and_connected : 1,
  27                cloning : 1,
  28                update_shallow : 1,
  29                followtags : 1,
  30                dry_run : 1,
  31                thin : 1,
  32                /* One of the SEND_PACK_PUSH_CERT_* constants. */
  33                push_cert : 2,
  34                deepen_relative : 1;
  35};
  36static struct options options;
  37static struct string_list cas_options = STRING_LIST_INIT_DUP;
  38
  39static int set_option(const char *name, const char *value)
  40{
  41        if (!strcmp(name, "verbosity")) {
  42                char *end;
  43                int v = strtol(value, &end, 10);
  44                if (value == end || *end)
  45                        return -1;
  46                options.verbosity = v;
  47                return 0;
  48        }
  49        else if (!strcmp(name, "progress")) {
  50                if (!strcmp(value, "true"))
  51                        options.progress = 1;
  52                else if (!strcmp(value, "false"))
  53                        options.progress = 0;
  54                else
  55                        return -1;
  56                return 0;
  57        }
  58        else if (!strcmp(name, "depth")) {
  59                char *end;
  60                unsigned long v = strtoul(value, &end, 10);
  61                if (value == end || *end)
  62                        return -1;
  63                options.depth = v;
  64                return 0;
  65        }
  66        else if (!strcmp(name, "deepen-since")) {
  67                options.deepen_since = xstrdup(value);
  68                return 0;
  69        }
  70        else if (!strcmp(name, "deepen-not")) {
  71                string_list_append(&options.deepen_not, value);
  72                return 0;
  73        }
  74        else if (!strcmp(name, "deepen-relative")) {
  75                if (!strcmp(value, "true"))
  76                        options.deepen_relative = 1;
  77                else if (!strcmp(value, "false"))
  78                        options.deepen_relative = 0;
  79                else
  80                        return -1;
  81                return 0;
  82        }
  83        else if (!strcmp(name, "followtags")) {
  84                if (!strcmp(value, "true"))
  85                        options.followtags = 1;
  86                else if (!strcmp(value, "false"))
  87                        options.followtags = 0;
  88                else
  89                        return -1;
  90                return 0;
  91        }
  92        else if (!strcmp(name, "dry-run")) {
  93                if (!strcmp(value, "true"))
  94                        options.dry_run = 1;
  95                else if (!strcmp(value, "false"))
  96                        options.dry_run = 0;
  97                else
  98                        return -1;
  99                return 0;
 100        }
 101        else if (!strcmp(name, "check-connectivity")) {
 102                if (!strcmp(value, "true"))
 103                        options.check_self_contained_and_connected = 1;
 104                else if (!strcmp(value, "false"))
 105                        options.check_self_contained_and_connected = 0;
 106                else
 107                        return -1;
 108                return 0;
 109        }
 110        else if (!strcmp(name, "cas")) {
 111                struct strbuf val = STRBUF_INIT;
 112                strbuf_addf(&val, "--" CAS_OPT_NAME "=%s", value);
 113                string_list_append(&cas_options, val.buf);
 114                strbuf_release(&val);
 115                return 0;
 116        } else if (!strcmp(name, "cloning")) {
 117                if (!strcmp(value, "true"))
 118                        options.cloning = 1;
 119                else if (!strcmp(value, "false"))
 120                        options.cloning = 0;
 121                else
 122                        return -1;
 123                return 0;
 124        } else if (!strcmp(name, "update-shallow")) {
 125                if (!strcmp(value, "true"))
 126                        options.update_shallow = 1;
 127                else if (!strcmp(value, "false"))
 128                        options.update_shallow = 0;
 129                else
 130                        return -1;
 131                return 0;
 132        } else if (!strcmp(name, "pushcert")) {
 133                if (!strcmp(value, "true"))
 134                        options.push_cert = SEND_PACK_PUSH_CERT_ALWAYS;
 135                else if (!strcmp(value, "false"))
 136                        options.push_cert = SEND_PACK_PUSH_CERT_NEVER;
 137                else if (!strcmp(value, "if-asked"))
 138                        options.push_cert = SEND_PACK_PUSH_CERT_IF_ASKED;
 139                else
 140                        return -1;
 141                return 0;
 142
 143#if LIBCURL_VERSION_NUM >= 0x070a08
 144        } else if (!strcmp(name, "family")) {
 145                if (!strcmp(value, "ipv4"))
 146                        git_curl_ipresolve = CURL_IPRESOLVE_V4;
 147                else if (!strcmp(value, "ipv6"))
 148                        git_curl_ipresolve = CURL_IPRESOLVE_V6;
 149                else if (!strcmp(value, "all"))
 150                        git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
 151                else
 152                        return -1;
 153                return 0;
 154#endif /* LIBCURL_VERSION_NUM >= 0x070a08 */
 155        } else {
 156                return 1 /* unsupported */;
 157        }
 158}
 159
 160struct discovery {
 161        const char *service;
 162        char *buf_alloc;
 163        char *buf;
 164        size_t len;
 165        struct ref *refs;
 166        struct sha1_array shallow;
 167        unsigned proto_git : 1;
 168};
 169static struct discovery *last_discovery;
 170
 171static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 172{
 173        struct ref *list = NULL;
 174        get_remote_heads(-1, heads->buf, heads->len, &list,
 175                         for_push ? REF_NORMAL : 0, NULL, &heads->shallow);
 176        return list;
 177}
 178
 179static struct ref *parse_info_refs(struct discovery *heads)
 180{
 181        char *data, *start, *mid;
 182        char *ref_name;
 183        int i = 0;
 184
 185        struct ref *refs = NULL;
 186        struct ref *ref = NULL;
 187        struct ref *last_ref = NULL;
 188
 189        data = heads->buf;
 190        start = NULL;
 191        mid = data;
 192        while (i < heads->len) {
 193                if (!start) {
 194                        start = &data[i];
 195                }
 196                if (data[i] == '\t')
 197                        mid = &data[i];
 198                if (data[i] == '\n') {
 199                        if (mid - start != 40)
 200                                die("%sinfo/refs not valid: is this a git repository?",
 201                                    url.buf);
 202                        data[i] = 0;
 203                        ref_name = mid + 1;
 204                        ref = alloc_ref(ref_name);
 205                        get_oid_hex(start, &ref->old_oid);
 206                        if (!refs)
 207                                refs = ref;
 208                        if (last_ref)
 209                                last_ref->next = ref;
 210                        last_ref = ref;
 211                        start = NULL;
 212                }
 213                i++;
 214        }
 215
 216        ref = alloc_ref("HEAD");
 217        if (!http_fetch_ref(url.buf, ref) &&
 218            !resolve_remote_symref(ref, refs)) {
 219                ref->next = refs;
 220                refs = ref;
 221        } else {
 222                free(ref);
 223        }
 224
 225        return refs;
 226}
 227
 228static void free_discovery(struct discovery *d)
 229{
 230        if (d) {
 231                if (d == last_discovery)
 232                        last_discovery = NULL;
 233                free(d->shallow.sha1);
 234                free(d->buf_alloc);
 235                free_refs(d->refs);
 236                free(d);
 237        }
 238}
 239
 240static int show_http_message(struct strbuf *type, struct strbuf *charset,
 241                             struct strbuf *msg)
 242{
 243        const char *p, *eol;
 244
 245        /*
 246         * We only show text/plain parts, as other types are likely
 247         * to be ugly to look at on the user's terminal.
 248         */
 249        if (strcmp(type->buf, "text/plain"))
 250                return -1;
 251        if (charset->len)
 252                strbuf_reencode(msg, charset->buf, get_log_output_encoding());
 253
 254        strbuf_trim(msg);
 255        if (!msg->len)
 256                return -1;
 257
 258        p = msg->buf;
 259        do {
 260                eol = strchrnul(p, '\n');
 261                fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 262                p = eol + 1;
 263        } while(*eol);
 264        return 0;
 265}
 266
 267static struct discovery *discover_refs(const char *service, int for_push)
 268{
 269        struct strbuf exp = STRBUF_INIT;
 270        struct strbuf type = STRBUF_INIT;
 271        struct strbuf charset = STRBUF_INIT;
 272        struct strbuf buffer = STRBUF_INIT;
 273        struct strbuf refs_url = STRBUF_INIT;
 274        struct strbuf effective_url = STRBUF_INIT;
 275        struct discovery *last = last_discovery;
 276        int http_ret, maybe_smart = 0;
 277        struct http_get_options options;
 278
 279        if (last && !strcmp(service, last->service))
 280                return last;
 281        free_discovery(last);
 282
 283        strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 284        if ((starts_with(url.buf, "http://") || starts_with(url.buf, "https://")) &&
 285             git_env_bool("GIT_SMART_HTTP", 1)) {
 286                maybe_smart = 1;
 287                if (!strchr(url.buf, '?'))
 288                        strbuf_addch(&refs_url, '?');
 289                else
 290                        strbuf_addch(&refs_url, '&');
 291                strbuf_addf(&refs_url, "service=%s", service);
 292        }
 293
 294        memset(&options, 0, sizeof(options));
 295        options.content_type = &type;
 296        options.charset = &charset;
 297        options.effective_url = &effective_url;
 298        options.base_url = &url;
 299        options.no_cache = 1;
 300        options.keep_error = 1;
 301
 302        http_ret = http_get_strbuf(refs_url.buf, &buffer, &options);
 303        switch (http_ret) {
 304        case HTTP_OK:
 305                break;
 306        case HTTP_MISSING_TARGET:
 307                show_http_message(&type, &charset, &buffer);
 308                die("repository '%s' not found", url.buf);
 309        case HTTP_NOAUTH:
 310                show_http_message(&type, &charset, &buffer);
 311                die("Authentication failed for '%s'", url.buf);
 312        default:
 313                show_http_message(&type, &charset, &buffer);
 314                die("unable to access '%s': %s", url.buf, curl_errorstr);
 315        }
 316
 317        last= xcalloc(1, sizeof(*last_discovery));
 318        last->service = service;
 319        last->buf_alloc = strbuf_detach(&buffer, &last->len);
 320        last->buf = last->buf_alloc;
 321
 322        strbuf_addf(&exp, "application/x-%s-advertisement", service);
 323        if (maybe_smart &&
 324            (5 <= last->len && last->buf[4] == '#') &&
 325            !strbuf_cmp(&exp, &type)) {
 326                char *line;
 327
 328                /*
 329                 * smart HTTP response; validate that the service
 330                 * pkt-line matches our request.
 331                 */
 332                line = packet_read_line_buf(&last->buf, &last->len, NULL);
 333
 334                strbuf_reset(&exp);
 335                strbuf_addf(&exp, "# service=%s", service);
 336                if (strcmp(line, exp.buf))
 337                        die("invalid server response; got '%s'", line);
 338                strbuf_release(&exp);
 339
 340                /* The header can include additional metadata lines, up
 341                 * until a packet flush marker.  Ignore these now, but
 342                 * in the future we might start to scan them.
 343                 */
 344                while (packet_read_line_buf(&last->buf, &last->len, NULL))
 345                        ;
 346
 347                last->proto_git = 1;
 348        }
 349
 350        if (last->proto_git)
 351                last->refs = parse_git_refs(last, for_push);
 352        else
 353                last->refs = parse_info_refs(last);
 354
 355        strbuf_release(&refs_url);
 356        strbuf_release(&exp);
 357        strbuf_release(&type);
 358        strbuf_release(&charset);
 359        strbuf_release(&effective_url);
 360        strbuf_release(&buffer);
 361        last_discovery = last;
 362        return last;
 363}
 364
 365static struct ref *get_refs(int for_push)
 366{
 367        struct discovery *heads;
 368
 369        if (for_push)
 370                heads = discover_refs("git-receive-pack", for_push);
 371        else
 372                heads = discover_refs("git-upload-pack", for_push);
 373
 374        return heads->refs;
 375}
 376
 377static void output_refs(struct ref *refs)
 378{
 379        struct ref *posn;
 380        for (posn = refs; posn; posn = posn->next) {
 381                if (posn->symref)
 382                        printf("@%s %s\n", posn->symref, posn->name);
 383                else
 384                        printf("%s %s\n", oid_to_hex(&posn->old_oid), posn->name);
 385        }
 386        printf("\n");
 387        fflush(stdout);
 388}
 389
 390struct rpc_state {
 391        const char *service_name;
 392        const char **argv;
 393        struct strbuf *stdin_preamble;
 394        char *service_url;
 395        char *hdr_content_type;
 396        char *hdr_accept;
 397        char *buf;
 398        size_t alloc;
 399        size_t len;
 400        size_t pos;
 401        int in;
 402        int out;
 403        struct strbuf result;
 404        unsigned gzip_request : 1;
 405        unsigned initial_buffer : 1;
 406};
 407
 408static size_t rpc_out(void *ptr, size_t eltsize,
 409                size_t nmemb, void *buffer_)
 410{
 411        size_t max = eltsize * nmemb;
 412        struct rpc_state *rpc = buffer_;
 413        size_t avail = rpc->len - rpc->pos;
 414
 415        if (!avail) {
 416                rpc->initial_buffer = 0;
 417                avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 418                if (!avail)
 419                        return 0;
 420                rpc->pos = 0;
 421                rpc->len = avail;
 422        }
 423
 424        if (max < avail)
 425                avail = max;
 426        memcpy(ptr, rpc->buf + rpc->pos, avail);
 427        rpc->pos += avail;
 428        return avail;
 429}
 430
 431#ifndef NO_CURL_IOCTL
 432static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 433{
 434        struct rpc_state *rpc = clientp;
 435
 436        switch (cmd) {
 437        case CURLIOCMD_NOP:
 438                return CURLIOE_OK;
 439
 440        case CURLIOCMD_RESTARTREAD:
 441                if (rpc->initial_buffer) {
 442                        rpc->pos = 0;
 443                        return CURLIOE_OK;
 444                }
 445                error("unable to rewind rpc post data - try increasing http.postBuffer");
 446                return CURLIOE_FAILRESTART;
 447
 448        default:
 449                return CURLIOE_UNKNOWNCMD;
 450        }
 451}
 452#endif
 453
 454static size_t rpc_in(char *ptr, size_t eltsize,
 455                size_t nmemb, void *buffer_)
 456{
 457        size_t size = eltsize * nmemb;
 458        struct rpc_state *rpc = buffer_;
 459        write_or_die(rpc->in, ptr, size);
 460        return size;
 461}
 462
 463static int run_slot(struct active_request_slot *slot,
 464                    struct slot_results *results)
 465{
 466        int err;
 467        struct slot_results results_buf;
 468
 469        if (!results)
 470                results = &results_buf;
 471
 472        err = run_one_slot(slot, results);
 473
 474        if (err != HTTP_OK && err != HTTP_REAUTH) {
 475                struct strbuf msg = STRBUF_INIT;
 476                if (results->http_code && results->http_code != 200)
 477                        strbuf_addf(&msg, "HTTP %ld", results->http_code);
 478                if (results->curl_result != CURLE_OK) {
 479                        if (msg.len)
 480                                strbuf_addch(&msg, ' ');
 481                        strbuf_addf(&msg, "curl %d", results->curl_result);
 482                        if (curl_errorstr[0]) {
 483                                strbuf_addch(&msg, ' ');
 484                                strbuf_addstr(&msg, curl_errorstr);
 485                        }
 486                }
 487                error("RPC failed; %s", msg.buf);
 488                strbuf_release(&msg);
 489        }
 490
 491        return err;
 492}
 493
 494static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 495{
 496        struct active_request_slot *slot;
 497        struct curl_slist *headers = http_copy_default_headers();
 498        struct strbuf buf = STRBUF_INIT;
 499        int err;
 500
 501        slot = get_active_slot();
 502
 503        headers = curl_slist_append(headers, rpc->hdr_content_type);
 504        headers = curl_slist_append(headers, rpc->hdr_accept);
 505
 506        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 507        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 508        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 509        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 510        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 511        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 512        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 513        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 514        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 515
 516        err = run_slot(slot, results);
 517
 518        curl_slist_free_all(headers);
 519        strbuf_release(&buf);
 520        return err;
 521}
 522
 523static int post_rpc(struct rpc_state *rpc)
 524{
 525        struct active_request_slot *slot;
 526        struct curl_slist *headers = http_copy_default_headers();
 527        int use_gzip = rpc->gzip_request;
 528        char *gzip_body = NULL;
 529        size_t gzip_size = 0;
 530        int err, large_request = 0;
 531        int needs_100_continue = 0;
 532
 533        /* Try to load the entire request, if we can fit it into the
 534         * allocated buffer space we can use HTTP/1.0 and avoid the
 535         * chunked encoding mess.
 536         */
 537        while (1) {
 538                size_t left = rpc->alloc - rpc->len;
 539                char *buf = rpc->buf + rpc->len;
 540                int n;
 541
 542                if (left < LARGE_PACKET_MAX) {
 543                        large_request = 1;
 544                        use_gzip = 0;
 545                        break;
 546                }
 547
 548                n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 549                if (!n)
 550                        break;
 551                rpc->len += n;
 552        }
 553
 554        if (large_request) {
 555                struct slot_results results;
 556
 557                do {
 558                        err = probe_rpc(rpc, &results);
 559                        if (err == HTTP_REAUTH)
 560                                credential_fill(&http_auth);
 561                } while (err == HTTP_REAUTH);
 562                if (err != HTTP_OK)
 563                        return -1;
 564
 565                if (results.auth_avail & CURLAUTH_GSSNEGOTIATE)
 566                        needs_100_continue = 1;
 567        }
 568
 569        headers = curl_slist_append(headers, rpc->hdr_content_type);
 570        headers = curl_slist_append(headers, rpc->hdr_accept);
 571        headers = curl_slist_append(headers, needs_100_continue ?
 572                "Expect: 100-continue" : "Expect:");
 573
 574retry:
 575        slot = get_active_slot();
 576
 577        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 578        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 579        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 580        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 581
 582        if (large_request) {
 583                /* The request body is large and the size cannot be predicted.
 584                 * We must use chunked encoding to send it.
 585                 */
 586                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 587                rpc->initial_buffer = 1;
 588                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 589                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 590#ifndef NO_CURL_IOCTL
 591                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 592                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 593#endif
 594                if (options.verbosity > 1) {
 595                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 596                        fflush(stderr);
 597                }
 598
 599        } else if (gzip_body) {
 600                /*
 601                 * If we are looping to retry authentication, then the previous
 602                 * run will have set up the headers and gzip buffer already,
 603                 * and we just need to send it.
 604                 */
 605                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 606                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 607
 608        } else if (use_gzip && 1024 < rpc->len) {
 609                /* The client backend isn't giving us compressed data so
 610                 * we can try to deflate it ourselves, this may save on.
 611                 * the transfer time.
 612                 */
 613                git_zstream stream;
 614                int ret;
 615
 616                git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 617                gzip_size = git_deflate_bound(&stream, rpc->len);
 618                gzip_body = xmalloc(gzip_size);
 619
 620                stream.next_in = (unsigned char *)rpc->buf;
 621                stream.avail_in = rpc->len;
 622                stream.next_out = (unsigned char *)gzip_body;
 623                stream.avail_out = gzip_size;
 624
 625                ret = git_deflate(&stream, Z_FINISH);
 626                if (ret != Z_STREAM_END)
 627                        die("cannot deflate request; zlib deflate error %d", ret);
 628
 629                ret = git_deflate_end_gently(&stream);
 630                if (ret != Z_OK)
 631                        die("cannot deflate request; zlib end error %d", ret);
 632
 633                gzip_size = stream.total_out;
 634
 635                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 636                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 637                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 638
 639                if (options.verbosity > 1) {
 640                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 641                                rpc->service_name,
 642                                (unsigned long)rpc->len, (unsigned long)gzip_size);
 643                        fflush(stderr);
 644                }
 645        } else {
 646                /* We know the complete request size in advance, use the
 647                 * more normal Content-Length approach.
 648                 */
 649                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 650                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 651                if (options.verbosity > 1) {
 652                        fprintf(stderr, "POST %s (%lu bytes)\n",
 653                                rpc->service_name, (unsigned long)rpc->len);
 654                        fflush(stderr);
 655                }
 656        }
 657
 658        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 659        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 660        curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 661
 662        err = run_slot(slot, NULL);
 663        if (err == HTTP_REAUTH && !large_request) {
 664                credential_fill(&http_auth);
 665                goto retry;
 666        }
 667        if (err != HTTP_OK)
 668                err = -1;
 669
 670        curl_slist_free_all(headers);
 671        free(gzip_body);
 672        return err;
 673}
 674
 675static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 676{
 677        const char *svc = rpc->service_name;
 678        struct strbuf buf = STRBUF_INIT;
 679        struct strbuf *preamble = rpc->stdin_preamble;
 680        struct child_process client = CHILD_PROCESS_INIT;
 681        int err = 0;
 682
 683        client.in = -1;
 684        client.out = -1;
 685        client.git_cmd = 1;
 686        client.argv = rpc->argv;
 687        if (start_command(&client))
 688                exit(1);
 689        if (preamble)
 690                write_or_die(client.in, preamble->buf, preamble->len);
 691        if (heads)
 692                write_or_die(client.in, heads->buf, heads->len);
 693
 694        rpc->alloc = http_post_buffer;
 695        rpc->buf = xmalloc(rpc->alloc);
 696        rpc->in = client.in;
 697        rpc->out = client.out;
 698        strbuf_init(&rpc->result, 0);
 699
 700        strbuf_addf(&buf, "%s%s", url.buf, svc);
 701        rpc->service_url = strbuf_detach(&buf, NULL);
 702
 703        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 704        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 705
 706        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 707        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 708
 709        while (!err) {
 710                int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 711                if (!n)
 712                        break;
 713                rpc->pos = 0;
 714                rpc->len = n;
 715                err |= post_rpc(rpc);
 716        }
 717
 718        close(client.in);
 719        client.in = -1;
 720        if (!err) {
 721                strbuf_read(&rpc->result, client.out, 0);
 722        } else {
 723                char buf[4096];
 724                for (;;)
 725                        if (xread(client.out, buf, sizeof(buf)) <= 0)
 726                                break;
 727        }
 728
 729        close(client.out);
 730        client.out = -1;
 731
 732        err |= finish_command(&client);
 733        free(rpc->service_url);
 734        free(rpc->hdr_content_type);
 735        free(rpc->hdr_accept);
 736        free(rpc->buf);
 737        strbuf_release(&buf);
 738        return err;
 739}
 740
 741static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 742{
 743        struct walker *walker;
 744        char **targets;
 745        int ret, i;
 746
 747        ALLOC_ARRAY(targets, nr_heads);
 748        if (options.depth || options.deepen_since)
 749                die("dumb http transport does not support shallow capabilities");
 750        for (i = 0; i < nr_heads; i++)
 751                targets[i] = xstrdup(oid_to_hex(&to_fetch[i]->old_oid));
 752
 753        walker = get_http_walker(url.buf);
 754        walker->get_all = 1;
 755        walker->get_tree = 1;
 756        walker->get_history = 1;
 757        walker->get_verbosely = options.verbosity >= 3;
 758        walker->get_recover = 0;
 759        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 760        walker_free(walker);
 761
 762        for (i = 0; i < nr_heads; i++)
 763                free(targets[i]);
 764        free(targets);
 765
 766        return ret ? error("fetch failed.") : 0;
 767}
 768
 769static int fetch_git(struct discovery *heads,
 770        int nr_heads, struct ref **to_fetch)
 771{
 772        struct rpc_state rpc;
 773        struct strbuf preamble = STRBUF_INIT;
 774        int i, err;
 775        struct argv_array args = ARGV_ARRAY_INIT;
 776
 777        argv_array_pushl(&args, "fetch-pack", "--stateless-rpc",
 778                         "--stdin", "--lock-pack", NULL);
 779        if (options.followtags)
 780                argv_array_push(&args, "--include-tag");
 781        if (options.thin)
 782                argv_array_push(&args, "--thin");
 783        if (options.verbosity >= 3)
 784                argv_array_pushl(&args, "-v", "-v", NULL);
 785        if (options.check_self_contained_and_connected)
 786                argv_array_push(&args, "--check-self-contained-and-connected");
 787        if (options.cloning)
 788                argv_array_push(&args, "--cloning");
 789        if (options.update_shallow)
 790                argv_array_push(&args, "--update-shallow");
 791        if (!options.progress)
 792                argv_array_push(&args, "--no-progress");
 793        if (options.depth)
 794                argv_array_pushf(&args, "--depth=%lu", options.depth);
 795        if (options.deepen_since)
 796                argv_array_pushf(&args, "--shallow-since=%s", options.deepen_since);
 797        for (i = 0; i < options.deepen_not.nr; i++)
 798                argv_array_pushf(&args, "--shallow-exclude=%s",
 799                                 options.deepen_not.items[i].string);
 800        if (options.deepen_relative && options.depth)
 801                argv_array_push(&args, "--deepen-relative");
 802        argv_array_push(&args, url.buf);
 803
 804        for (i = 0; i < nr_heads; i++) {
 805                struct ref *ref = to_fetch[i];
 806                if (!*ref->name)
 807                        die("cannot fetch by sha1 over smart http");
 808                packet_buf_write(&preamble, "%s %s\n",
 809                                 oid_to_hex(&ref->old_oid), ref->name);
 810        }
 811        packet_buf_flush(&preamble);
 812
 813        memset(&rpc, 0, sizeof(rpc));
 814        rpc.service_name = "git-upload-pack",
 815        rpc.argv = args.argv;
 816        rpc.stdin_preamble = &preamble;
 817        rpc.gzip_request = 1;
 818
 819        err = rpc_service(&rpc, heads);
 820        if (rpc.result.len)
 821                write_or_die(1, rpc.result.buf, rpc.result.len);
 822        strbuf_release(&rpc.result);
 823        strbuf_release(&preamble);
 824        argv_array_clear(&args);
 825        return err;
 826}
 827
 828static int fetch(int nr_heads, struct ref **to_fetch)
 829{
 830        struct discovery *d = discover_refs("git-upload-pack", 0);
 831        if (d->proto_git)
 832                return fetch_git(d, nr_heads, to_fetch);
 833        else
 834                return fetch_dumb(nr_heads, to_fetch);
 835}
 836
 837static void parse_fetch(struct strbuf *buf)
 838{
 839        struct ref **to_fetch = NULL;
 840        struct ref *list_head = NULL;
 841        struct ref **list = &list_head;
 842        int alloc_heads = 0, nr_heads = 0;
 843
 844        do {
 845                const char *p;
 846                if (skip_prefix(buf->buf, "fetch ", &p)) {
 847                        const char *name;
 848                        struct ref *ref;
 849                        struct object_id old_oid;
 850
 851                        if (get_oid_hex(p, &old_oid))
 852                                die("protocol error: expected sha/ref, got %s'", p);
 853                        if (p[GIT_SHA1_HEXSZ] == ' ')
 854                                name = p + GIT_SHA1_HEXSZ + 1;
 855                        else if (!p[GIT_SHA1_HEXSZ])
 856                                name = "";
 857                        else
 858                                die("protocol error: expected sha/ref, got %s'", p);
 859
 860                        ref = alloc_ref(name);
 861                        oidcpy(&ref->old_oid, &old_oid);
 862
 863                        *list = ref;
 864                        list = &ref->next;
 865
 866                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 867                        to_fetch[nr_heads++] = ref;
 868                }
 869                else
 870                        die("http transport does not support %s", buf->buf);
 871
 872                strbuf_reset(buf);
 873                if (strbuf_getline_lf(buf, stdin) == EOF)
 874                        return;
 875                if (!*buf->buf)
 876                        break;
 877        } while (1);
 878
 879        if (fetch(nr_heads, to_fetch))
 880                exit(128); /* error already reported */
 881        free_refs(list_head);
 882        free(to_fetch);
 883
 884        printf("\n");
 885        fflush(stdout);
 886        strbuf_reset(buf);
 887}
 888
 889static int push_dav(int nr_spec, char **specs)
 890{
 891        struct child_process child = CHILD_PROCESS_INIT;
 892        size_t i;
 893
 894        child.git_cmd = 1;
 895        argv_array_push(&child.args, "http-push");
 896        argv_array_push(&child.args, "--helper-status");
 897        if (options.dry_run)
 898                argv_array_push(&child.args, "--dry-run");
 899        if (options.verbosity > 1)
 900                argv_array_push(&child.args, "--verbose");
 901        argv_array_push(&child.args, url.buf);
 902        for (i = 0; i < nr_spec; i++)
 903                argv_array_push(&child.args, specs[i]);
 904
 905        if (run_command(&child))
 906                die("git-http-push failed");
 907        return 0;
 908}
 909
 910static int push_git(struct discovery *heads, int nr_spec, char **specs)
 911{
 912        struct rpc_state rpc;
 913        int i, err;
 914        struct argv_array args;
 915        struct string_list_item *cas_option;
 916        struct strbuf preamble = STRBUF_INIT;
 917
 918        argv_array_init(&args);
 919        argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 920                         NULL);
 921
 922        if (options.thin)
 923                argv_array_push(&args, "--thin");
 924        if (options.dry_run)
 925                argv_array_push(&args, "--dry-run");
 926        if (options.push_cert == SEND_PACK_PUSH_CERT_ALWAYS)
 927                argv_array_push(&args, "--signed=yes");
 928        else if (options.push_cert == SEND_PACK_PUSH_CERT_IF_ASKED)
 929                argv_array_push(&args, "--signed=if-asked");
 930        if (options.verbosity == 0)
 931                argv_array_push(&args, "--quiet");
 932        else if (options.verbosity > 1)
 933                argv_array_push(&args, "--verbose");
 934        argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 935        for_each_string_list_item(cas_option, &cas_options)
 936                argv_array_push(&args, cas_option->string);
 937        argv_array_push(&args, url.buf);
 938
 939        argv_array_push(&args, "--stdin");
 940        for (i = 0; i < nr_spec; i++)
 941                packet_buf_write(&preamble, "%s\n", specs[i]);
 942        packet_buf_flush(&preamble);
 943
 944        memset(&rpc, 0, sizeof(rpc));
 945        rpc.service_name = "git-receive-pack",
 946        rpc.argv = args.argv;
 947        rpc.stdin_preamble = &preamble;
 948
 949        err = rpc_service(&rpc, heads);
 950        if (rpc.result.len)
 951                write_or_die(1, rpc.result.buf, rpc.result.len);
 952        strbuf_release(&rpc.result);
 953        strbuf_release(&preamble);
 954        argv_array_clear(&args);
 955        return err;
 956}
 957
 958static int push(int nr_spec, char **specs)
 959{
 960        struct discovery *heads = discover_refs("git-receive-pack", 1);
 961        int ret;
 962
 963        if (heads->proto_git)
 964                ret = push_git(heads, nr_spec, specs);
 965        else
 966                ret = push_dav(nr_spec, specs);
 967        free_discovery(heads);
 968        return ret;
 969}
 970
 971static void parse_push(struct strbuf *buf)
 972{
 973        char **specs = NULL;
 974        int alloc_spec = 0, nr_spec = 0, i, ret;
 975
 976        do {
 977                if (starts_with(buf->buf, "push ")) {
 978                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 979                        specs[nr_spec++] = xstrdup(buf->buf + 5);
 980                }
 981                else
 982                        die("http transport does not support %s", buf->buf);
 983
 984                strbuf_reset(buf);
 985                if (strbuf_getline_lf(buf, stdin) == EOF)
 986                        goto free_specs;
 987                if (!*buf->buf)
 988                        break;
 989        } while (1);
 990
 991        ret = push(nr_spec, specs);
 992        printf("\n");
 993        fflush(stdout);
 994
 995        if (ret)
 996                exit(128); /* error already reported */
 997
 998 free_specs:
 999        for (i = 0; i < nr_spec; i++)
1000                free(specs[i]);
1001        free(specs);
1002}
1003
1004int cmd_main(int argc, const char **argv)
1005{
1006        struct strbuf buf = STRBUF_INIT;
1007        int nongit;
1008
1009        setup_git_directory_gently(&nongit);
1010        if (argc < 2) {
1011                error("remote-curl: usage: git remote-curl <remote> [<url>]");
1012                return 1;
1013        }
1014
1015        options.verbosity = 1;
1016        options.progress = !!isatty(2);
1017        options.thin = 1;
1018        string_list_init(&options.deepen_not, 1);
1019
1020        remote = remote_get(argv[1]);
1021
1022        if (argc > 2) {
1023                end_url_with_slash(&url, argv[2]);
1024        } else {
1025                end_url_with_slash(&url, remote->url[0]);
1026        }
1027
1028        http_init(remote, url.buf, 0);
1029
1030        do {
1031                const char *arg;
1032
1033                if (strbuf_getline_lf(&buf, stdin) == EOF) {
1034                        if (ferror(stdin))
1035                                error("remote-curl: error reading command stream from git");
1036                        return 1;
1037                }
1038                if (buf.len == 0)
1039                        break;
1040                if (starts_with(buf.buf, "fetch ")) {
1041                        if (nongit)
1042                                die("remote-curl: fetch attempted without a local repo");
1043                        parse_fetch(&buf);
1044
1045                } else if (!strcmp(buf.buf, "list") || starts_with(buf.buf, "list ")) {
1046                        int for_push = !!strstr(buf.buf + 4, "for-push");
1047                        output_refs(get_refs(for_push));
1048
1049                } else if (starts_with(buf.buf, "push ")) {
1050                        parse_push(&buf);
1051
1052                } else if (skip_prefix(buf.buf, "option ", &arg)) {
1053                        char *value = strchr(arg, ' ');
1054                        int result;
1055
1056                        if (value)
1057                                *value++ = '\0';
1058                        else
1059                                value = "true";
1060
1061                        result = set_option(arg, value);
1062                        if (!result)
1063                                printf("ok\n");
1064                        else if (result < 0)
1065                                printf("error invalid value\n");
1066                        else
1067                                printf("unsupported\n");
1068                        fflush(stdout);
1069
1070                } else if (!strcmp(buf.buf, "capabilities")) {
1071                        printf("fetch\n");
1072                        printf("option\n");
1073                        printf("push\n");
1074                        printf("check-connectivity\n");
1075                        printf("\n");
1076                        fflush(stdout);
1077                } else {
1078                        error("remote-curl: unknown command '%s' from git", buf.buf);
1079                        return 1;
1080                }
1081                strbuf_reset(&buf);
1082        } while (1);
1083
1084        http_cleanup();
1085
1086        return 0;
1087}