Andrew's git / gitweb.git / remote-curl.c
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remote-curl.con commit remote-curl: rewrite base url from info/refs redirects (050ef36)
   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 "sideband.h"
  10#include "argv-array.h"
  11#include "credential.h"
  12
  13static struct remote *remote;
  14/* always ends with a trailing slash */
  15static struct strbuf url = STRBUF_INIT;
  16
  17struct options {
  18        int verbosity;
  19        unsigned long depth;
  20        unsigned progress : 1,
  21                followtags : 1,
  22                dry_run : 1,
  23                thin : 1;
  24};
  25static struct options options;
  26
  27static int set_option(const char *name, const char *value)
  28{
  29        if (!strcmp(name, "verbosity")) {
  30                char *end;
  31                int v = strtol(value, &end, 10);
  32                if (value == end || *end)
  33                        return -1;
  34                options.verbosity = v;
  35                return 0;
  36        }
  37        else if (!strcmp(name, "progress")) {
  38                if (!strcmp(value, "true"))
  39                        options.progress = 1;
  40                else if (!strcmp(value, "false"))
  41                        options.progress = 0;
  42                else
  43                        return -1;
  44                return 0;
  45        }
  46        else if (!strcmp(name, "depth")) {
  47                char *end;
  48                unsigned long v = strtoul(value, &end, 10);
  49                if (value == end || *end)
  50                        return -1;
  51                options.depth = v;
  52                return 0;
  53        }
  54        else if (!strcmp(name, "followtags")) {
  55                if (!strcmp(value, "true"))
  56                        options.followtags = 1;
  57                else if (!strcmp(value, "false"))
  58                        options.followtags = 0;
  59                else
  60                        return -1;
  61                return 0;
  62        }
  63        else if (!strcmp(name, "dry-run")) {
  64                if (!strcmp(value, "true"))
  65                        options.dry_run = 1;
  66                else if (!strcmp(value, "false"))
  67                        options.dry_run = 0;
  68                else
  69                        return -1;
  70                return 0;
  71        }
  72        else {
  73                return 1 /* unsupported */;
  74        }
  75}
  76
  77struct discovery {
  78        const char *service;
  79        char *buf_alloc;
  80        char *buf;
  81        size_t len;
  82        struct ref *refs;
  83        unsigned proto_git : 1;
  84};
  85static struct discovery *last_discovery;
  86
  87static struct ref *parse_git_refs(struct discovery *heads, int for_push)
  88{
  89        struct ref *list = NULL;
  90        get_remote_heads(-1, heads->buf, heads->len, &list,
  91                         for_push ? REF_NORMAL : 0, NULL);
  92        return list;
  93}
  94
  95static struct ref *parse_info_refs(struct discovery *heads)
  96{
  97        char *data, *start, *mid;
  98        char *ref_name;
  99        int i = 0;
 100
 101        struct ref *refs = NULL;
 102        struct ref *ref = NULL;
 103        struct ref *last_ref = NULL;
 104
 105        data = heads->buf;
 106        start = NULL;
 107        mid = data;
 108        while (i < heads->len) {
 109                if (!start) {
 110                        start = &data[i];
 111                }
 112                if (data[i] == '\t')
 113                        mid = &data[i];
 114                if (data[i] == '\n') {
 115                        if (mid - start != 40)
 116                                die("%sinfo/refs not valid: is this a git repository?",
 117                                    url.buf);
 118                        data[i] = 0;
 119                        ref_name = mid + 1;
 120                        ref = xmalloc(sizeof(struct ref) +
 121                                      strlen(ref_name) + 1);
 122                        memset(ref, 0, sizeof(struct ref));
 123                        strcpy(ref->name, ref_name);
 124                        get_sha1_hex(start, ref->old_sha1);
 125                        if (!refs)
 126                                refs = ref;
 127                        if (last_ref)
 128                                last_ref->next = ref;
 129                        last_ref = ref;
 130                        start = NULL;
 131                }
 132                i++;
 133        }
 134
 135        ref = alloc_ref("HEAD");
 136        if (!http_fetch_ref(url.buf, ref) &&
 137            !resolve_remote_symref(ref, refs)) {
 138                ref->next = refs;
 139                refs = ref;
 140        } else {
 141                free(ref);
 142        }
 143
 144        return refs;
 145}
 146
 147static void free_discovery(struct discovery *d)
 148{
 149        if (d) {
 150                if (d == last_discovery)
 151                        last_discovery = NULL;
 152                free(d->buf_alloc);
 153                free_refs(d->refs);
 154                free(d);
 155        }
 156}
 157
 158static int show_http_message(struct strbuf *type, struct strbuf *msg)
 159{
 160        const char *p, *eol;
 161
 162        /*
 163         * We only show text/plain parts, as other types are likely
 164         * to be ugly to look at on the user's terminal.
 165         *
 166         * TODO should handle "; charset=XXX", and re-encode into
 167         * logoutputencoding
 168         */
 169        if (strcasecmp(type->buf, "text/plain"))
 170                return -1;
 171
 172        strbuf_trim(msg);
 173        if (!msg->len)
 174                return -1;
 175
 176        p = msg->buf;
 177        do {
 178                eol = strchrnul(p, '\n');
 179                fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 180                p = eol + 1;
 181        } while(*eol);
 182        return 0;
 183}
 184
 185static struct discovery* discover_refs(const char *service, int for_push)
 186{
 187        struct strbuf exp = STRBUF_INIT;
 188        struct strbuf type = STRBUF_INIT;
 189        struct strbuf buffer = STRBUF_INIT;
 190        struct strbuf refs_url = STRBUF_INIT;
 191        struct strbuf effective_url = STRBUF_INIT;
 192        struct discovery *last = last_discovery;
 193        int http_ret, maybe_smart = 0;
 194        struct http_get_options options;
 195
 196        if (last && !strcmp(service, last->service))
 197                return last;
 198        free_discovery(last);
 199
 200        strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 201        if ((!prefixcmp(url.buf, "http://") || !prefixcmp(url.buf, "https://")) &&
 202             git_env_bool("GIT_SMART_HTTP", 1)) {
 203                maybe_smart = 1;
 204                if (!strchr(url.buf, '?'))
 205                        strbuf_addch(&refs_url, '?');
 206                else
 207                        strbuf_addch(&refs_url, '&');
 208                strbuf_addf(&refs_url, "service=%s", service);
 209        }
 210
 211        memset(&options, 0, sizeof(options));
 212        options.content_type = &type;
 213        options.effective_url = &effective_url;
 214        options.base_url = &url;
 215        options.no_cache = 1;
 216        options.keep_error = 1;
 217
 218        http_ret = http_get_strbuf(refs_url.buf, &buffer, &options);
 219        switch (http_ret) {
 220        case HTTP_OK:
 221                break;
 222        case HTTP_MISSING_TARGET:
 223                show_http_message(&type, &buffer);
 224                die("repository '%s' not found", url.buf);
 225        case HTTP_NOAUTH:
 226                show_http_message(&type, &buffer);
 227                die("Authentication failed for '%s'", url.buf);
 228        default:
 229                show_http_message(&type, &buffer);
 230                die("unable to access '%s': %s", url.buf, curl_errorstr);
 231        }
 232
 233        last= xcalloc(1, sizeof(*last_discovery));
 234        last->service = service;
 235        last->buf_alloc = strbuf_detach(&buffer, &last->len);
 236        last->buf = last->buf_alloc;
 237
 238        strbuf_addf(&exp, "application/x-%s-advertisement", service);
 239        if (maybe_smart &&
 240            (5 <= last->len && last->buf[4] == '#') &&
 241            !strbuf_cmp(&exp, &type)) {
 242                char *line;
 243
 244                /*
 245                 * smart HTTP response; validate that the service
 246                 * pkt-line matches our request.
 247                 */
 248                line = packet_read_line_buf(&last->buf, &last->len, NULL);
 249
 250                strbuf_reset(&exp);
 251                strbuf_addf(&exp, "# service=%s", service);
 252                if (strcmp(line, exp.buf))
 253                        die("invalid server response; got '%s'", line);
 254                strbuf_release(&exp);
 255
 256                /* The header can include additional metadata lines, up
 257                 * until a packet flush marker.  Ignore these now, but
 258                 * in the future we might start to scan them.
 259                 */
 260                while (packet_read_line_buf(&last->buf, &last->len, NULL))
 261                        ;
 262
 263                last->proto_git = 1;
 264        }
 265
 266        if (last->proto_git)
 267                last->refs = parse_git_refs(last, for_push);
 268        else
 269                last->refs = parse_info_refs(last);
 270
 271        strbuf_release(&refs_url);
 272        strbuf_release(&exp);
 273        strbuf_release(&type);
 274        strbuf_release(&effective_url);
 275        strbuf_release(&buffer);
 276        last_discovery = last;
 277        return last;
 278}
 279
 280static struct ref *get_refs(int for_push)
 281{
 282        struct discovery *heads;
 283
 284        if (for_push)
 285                heads = discover_refs("git-receive-pack", for_push);
 286        else
 287                heads = discover_refs("git-upload-pack", for_push);
 288
 289        return heads->refs;
 290}
 291
 292static void output_refs(struct ref *refs)
 293{
 294        struct ref *posn;
 295        for (posn = refs; posn; posn = posn->next) {
 296                if (posn->symref)
 297                        printf("@%s %s\n", posn->symref, posn->name);
 298                else
 299                        printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 300        }
 301        printf("\n");
 302        fflush(stdout);
 303}
 304
 305struct rpc_state {
 306        const char *service_name;
 307        const char **argv;
 308        struct strbuf *stdin_preamble;
 309        char *service_url;
 310        char *hdr_content_type;
 311        char *hdr_accept;
 312        char *buf;
 313        size_t alloc;
 314        size_t len;
 315        size_t pos;
 316        int in;
 317        int out;
 318        struct strbuf result;
 319        unsigned gzip_request : 1;
 320        unsigned initial_buffer : 1;
 321};
 322
 323static size_t rpc_out(void *ptr, size_t eltsize,
 324                size_t nmemb, void *buffer_)
 325{
 326        size_t max = eltsize * nmemb;
 327        struct rpc_state *rpc = buffer_;
 328        size_t avail = rpc->len - rpc->pos;
 329
 330        if (!avail) {
 331                rpc->initial_buffer = 0;
 332                avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 333                if (!avail)
 334                        return 0;
 335                rpc->pos = 0;
 336                rpc->len = avail;
 337        }
 338
 339        if (max < avail)
 340                avail = max;
 341        memcpy(ptr, rpc->buf + rpc->pos, avail);
 342        rpc->pos += avail;
 343        return avail;
 344}
 345
 346#ifndef NO_CURL_IOCTL
 347static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 348{
 349        struct rpc_state *rpc = clientp;
 350
 351        switch (cmd) {
 352        case CURLIOCMD_NOP:
 353                return CURLIOE_OK;
 354
 355        case CURLIOCMD_RESTARTREAD:
 356                if (rpc->initial_buffer) {
 357                        rpc->pos = 0;
 358                        return CURLIOE_OK;
 359                }
 360                fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
 361                return CURLIOE_FAILRESTART;
 362
 363        default:
 364                return CURLIOE_UNKNOWNCMD;
 365        }
 366}
 367#endif
 368
 369static size_t rpc_in(char *ptr, size_t eltsize,
 370                size_t nmemb, void *buffer_)
 371{
 372        size_t size = eltsize * nmemb;
 373        struct rpc_state *rpc = buffer_;
 374        write_or_die(rpc->in, ptr, size);
 375        return size;
 376}
 377
 378static int run_slot(struct active_request_slot *slot)
 379{
 380        int err;
 381        struct slot_results results;
 382
 383        slot->results = &results;
 384        slot->curl_result = curl_easy_perform(slot->curl);
 385        finish_active_slot(slot);
 386
 387        err = handle_curl_result(&results);
 388        if (err != HTTP_OK && err != HTTP_REAUTH) {
 389                error("RPC failed; result=%d, HTTP code = %ld",
 390                      results.curl_result, results.http_code);
 391        }
 392
 393        return err;
 394}
 395
 396static int probe_rpc(struct rpc_state *rpc)
 397{
 398        struct active_request_slot *slot;
 399        struct curl_slist *headers = NULL;
 400        struct strbuf buf = STRBUF_INIT;
 401        int err;
 402
 403        slot = get_active_slot();
 404
 405        headers = curl_slist_append(headers, rpc->hdr_content_type);
 406        headers = curl_slist_append(headers, rpc->hdr_accept);
 407
 408        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 409        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 410        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 411        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 412        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 413        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 414        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 415        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 416        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 417
 418        err = run_slot(slot);
 419
 420        curl_slist_free_all(headers);
 421        strbuf_release(&buf);
 422        return err;
 423}
 424
 425static int post_rpc(struct rpc_state *rpc)
 426{
 427        struct active_request_slot *slot;
 428        struct curl_slist *headers = NULL;
 429        int use_gzip = rpc->gzip_request;
 430        char *gzip_body = NULL;
 431        size_t gzip_size = 0;
 432        int err, large_request = 0;
 433
 434        /* Try to load the entire request, if we can fit it into the
 435         * allocated buffer space we can use HTTP/1.0 and avoid the
 436         * chunked encoding mess.
 437         */
 438        while (1) {
 439                size_t left = rpc->alloc - rpc->len;
 440                char *buf = rpc->buf + rpc->len;
 441                int n;
 442
 443                if (left < LARGE_PACKET_MAX) {
 444                        large_request = 1;
 445                        use_gzip = 0;
 446                        break;
 447                }
 448
 449                n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 450                if (!n)
 451                        break;
 452                rpc->len += n;
 453        }
 454
 455        if (large_request) {
 456                do {
 457                        err = probe_rpc(rpc);
 458                        if (err == HTTP_REAUTH)
 459                                credential_fill(&http_auth);
 460                } while (err == HTTP_REAUTH);
 461                if (err != HTTP_OK)
 462                        return -1;
 463        }
 464
 465        headers = curl_slist_append(headers, rpc->hdr_content_type);
 466        headers = curl_slist_append(headers, rpc->hdr_accept);
 467        headers = curl_slist_append(headers, "Expect:");
 468
 469retry:
 470        slot = get_active_slot();
 471
 472        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 473        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 474        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 475        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 476
 477        if (large_request) {
 478                /* The request body is large and the size cannot be predicted.
 479                 * We must use chunked encoding to send it.
 480                 */
 481                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 482                rpc->initial_buffer = 1;
 483                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 484                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 485#ifndef NO_CURL_IOCTL
 486                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 487                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 488#endif
 489                if (options.verbosity > 1) {
 490                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 491                        fflush(stderr);
 492                }
 493
 494        } else if (gzip_body) {
 495                /*
 496                 * If we are looping to retry authentication, then the previous
 497                 * run will have set up the headers and gzip buffer already,
 498                 * and we just need to send it.
 499                 */
 500                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 501                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 502
 503        } else if (use_gzip && 1024 < rpc->len) {
 504                /* The client backend isn't giving us compressed data so
 505                 * we can try to deflate it ourselves, this may save on.
 506                 * the transfer time.
 507                 */
 508                git_zstream stream;
 509                int ret;
 510
 511                memset(&stream, 0, sizeof(stream));
 512                git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 513                gzip_size = git_deflate_bound(&stream, rpc->len);
 514                gzip_body = xmalloc(gzip_size);
 515
 516                stream.next_in = (unsigned char *)rpc->buf;
 517                stream.avail_in = rpc->len;
 518                stream.next_out = (unsigned char *)gzip_body;
 519                stream.avail_out = gzip_size;
 520
 521                ret = git_deflate(&stream, Z_FINISH);
 522                if (ret != Z_STREAM_END)
 523                        die("cannot deflate request; zlib deflate error %d", ret);
 524
 525                ret = git_deflate_end_gently(&stream);
 526                if (ret != Z_OK)
 527                        die("cannot deflate request; zlib end error %d", ret);
 528
 529                gzip_size = stream.total_out;
 530
 531                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 532                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 533                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 534
 535                if (options.verbosity > 1) {
 536                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 537                                rpc->service_name,
 538                                (unsigned long)rpc->len, (unsigned long)gzip_size);
 539                        fflush(stderr);
 540                }
 541        } else {
 542                /* We know the complete request size in advance, use the
 543                 * more normal Content-Length approach.
 544                 */
 545                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 546                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 547                if (options.verbosity > 1) {
 548                        fprintf(stderr, "POST %s (%lu bytes)\n",
 549                                rpc->service_name, (unsigned long)rpc->len);
 550                        fflush(stderr);
 551                }
 552        }
 553
 554        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 555        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 556        curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 557
 558        err = run_slot(slot);
 559        if (err == HTTP_REAUTH && !large_request) {
 560                credential_fill(&http_auth);
 561                goto retry;
 562        }
 563        if (err != HTTP_OK)
 564                err = -1;
 565
 566        curl_slist_free_all(headers);
 567        free(gzip_body);
 568        return err;
 569}
 570
 571static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 572{
 573        const char *svc = rpc->service_name;
 574        struct strbuf buf = STRBUF_INIT;
 575        struct strbuf *preamble = rpc->stdin_preamble;
 576        struct child_process client;
 577        int err = 0;
 578
 579        memset(&client, 0, sizeof(client));
 580        client.in = -1;
 581        client.out = -1;
 582        client.git_cmd = 1;
 583        client.argv = rpc->argv;
 584        if (start_command(&client))
 585                exit(1);
 586        if (preamble)
 587                write_or_die(client.in, preamble->buf, preamble->len);
 588        if (heads)
 589                write_or_die(client.in, heads->buf, heads->len);
 590
 591        rpc->alloc = http_post_buffer;
 592        rpc->buf = xmalloc(rpc->alloc);
 593        rpc->in = client.in;
 594        rpc->out = client.out;
 595        strbuf_init(&rpc->result, 0);
 596
 597        strbuf_addf(&buf, "%s%s", url.buf, svc);
 598        rpc->service_url = strbuf_detach(&buf, NULL);
 599
 600        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 601        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 602
 603        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 604        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 605
 606        while (!err) {
 607                int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 608                if (!n)
 609                        break;
 610                rpc->pos = 0;
 611                rpc->len = n;
 612                err |= post_rpc(rpc);
 613        }
 614
 615        close(client.in);
 616        client.in = -1;
 617        if (!err) {
 618                strbuf_read(&rpc->result, client.out, 0);
 619        } else {
 620                char buf[4096];
 621                for (;;)
 622                        if (xread(client.out, buf, sizeof(buf)) <= 0)
 623                                break;
 624        }
 625
 626        close(client.out);
 627        client.out = -1;
 628
 629        err |= finish_command(&client);
 630        free(rpc->service_url);
 631        free(rpc->hdr_content_type);
 632        free(rpc->hdr_accept);
 633        free(rpc->buf);
 634        strbuf_release(&buf);
 635        return err;
 636}
 637
 638static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 639{
 640        struct walker *walker;
 641        char **targets = xmalloc(nr_heads * sizeof(char*));
 642        int ret, i;
 643
 644        if (options.depth)
 645                die("dumb http transport does not support --depth");
 646        for (i = 0; i < nr_heads; i++)
 647                targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 648
 649        walker = get_http_walker(url.buf);
 650        walker->get_all = 1;
 651        walker->get_tree = 1;
 652        walker->get_history = 1;
 653        walker->get_verbosely = options.verbosity >= 3;
 654        walker->get_recover = 0;
 655        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 656        walker_free(walker);
 657
 658        for (i = 0; i < nr_heads; i++)
 659                free(targets[i]);
 660        free(targets);
 661
 662        return ret ? error("Fetch failed.") : 0;
 663}
 664
 665static int fetch_git(struct discovery *heads,
 666        int nr_heads, struct ref **to_fetch)
 667{
 668        struct rpc_state rpc;
 669        struct strbuf preamble = STRBUF_INIT;
 670        char *depth_arg = NULL;
 671        int argc = 0, i, err;
 672        const char *argv[15];
 673
 674        argv[argc++] = "fetch-pack";
 675        argv[argc++] = "--stateless-rpc";
 676        argv[argc++] = "--stdin";
 677        argv[argc++] = "--lock-pack";
 678        if (options.followtags)
 679                argv[argc++] = "--include-tag";
 680        if (options.thin)
 681                argv[argc++] = "--thin";
 682        if (options.verbosity >= 3) {
 683                argv[argc++] = "-v";
 684                argv[argc++] = "-v";
 685        }
 686        if (!options.progress)
 687                argv[argc++] = "--no-progress";
 688        if (options.depth) {
 689                struct strbuf buf = STRBUF_INIT;
 690                strbuf_addf(&buf, "--depth=%lu", options.depth);
 691                depth_arg = strbuf_detach(&buf, NULL);
 692                argv[argc++] = depth_arg;
 693        }
 694        argv[argc++] = url.buf;
 695        argv[argc++] = NULL;
 696
 697        for (i = 0; i < nr_heads; i++) {
 698                struct ref *ref = to_fetch[i];
 699                if (!ref->name || !*ref->name)
 700                        die("cannot fetch by sha1 over smart http");
 701                packet_buf_write(&preamble, "%s\n", ref->name);
 702        }
 703        packet_buf_flush(&preamble);
 704
 705        memset(&rpc, 0, sizeof(rpc));
 706        rpc.service_name = "git-upload-pack",
 707        rpc.argv = argv;
 708        rpc.stdin_preamble = &preamble;
 709        rpc.gzip_request = 1;
 710
 711        err = rpc_service(&rpc, heads);
 712        if (rpc.result.len)
 713                write_or_die(1, rpc.result.buf, rpc.result.len);
 714        strbuf_release(&rpc.result);
 715        strbuf_release(&preamble);
 716        free(depth_arg);
 717        return err;
 718}
 719
 720static int fetch(int nr_heads, struct ref **to_fetch)
 721{
 722        struct discovery *d = discover_refs("git-upload-pack", 0);
 723        if (d->proto_git)
 724                return fetch_git(d, nr_heads, to_fetch);
 725        else
 726                return fetch_dumb(nr_heads, to_fetch);
 727}
 728
 729static void parse_fetch(struct strbuf *buf)
 730{
 731        struct ref **to_fetch = NULL;
 732        struct ref *list_head = NULL;
 733        struct ref **list = &list_head;
 734        int alloc_heads = 0, nr_heads = 0;
 735
 736        do {
 737                if (!prefixcmp(buf->buf, "fetch ")) {
 738                        char *p = buf->buf + strlen("fetch ");
 739                        char *name;
 740                        struct ref *ref;
 741                        unsigned char old_sha1[20];
 742
 743                        if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 744                                die("protocol error: expected sha/ref, got %s'", p);
 745                        if (p[40] == ' ')
 746                                name = p + 41;
 747                        else if (!p[40])
 748                                name = "";
 749                        else
 750                                die("protocol error: expected sha/ref, got %s'", p);
 751
 752                        ref = alloc_ref(name);
 753                        hashcpy(ref->old_sha1, old_sha1);
 754
 755                        *list = ref;
 756                        list = &ref->next;
 757
 758                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 759                        to_fetch[nr_heads++] = ref;
 760                }
 761                else
 762                        die("http transport does not support %s", buf->buf);
 763
 764                strbuf_reset(buf);
 765                if (strbuf_getline(buf, stdin, '\n') == EOF)
 766                        return;
 767                if (!*buf->buf)
 768                        break;
 769        } while (1);
 770
 771        if (fetch(nr_heads, to_fetch))
 772                exit(128); /* error already reported */
 773        free_refs(list_head);
 774        free(to_fetch);
 775
 776        printf("\n");
 777        fflush(stdout);
 778        strbuf_reset(buf);
 779}
 780
 781static int push_dav(int nr_spec, char **specs)
 782{
 783        const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 784        int argc = 0, i;
 785
 786        argv[argc++] = "http-push";
 787        argv[argc++] = "--helper-status";
 788        if (options.dry_run)
 789                argv[argc++] = "--dry-run";
 790        if (options.verbosity > 1)
 791                argv[argc++] = "--verbose";
 792        argv[argc++] = url.buf;
 793        for (i = 0; i < nr_spec; i++)
 794                argv[argc++] = specs[i];
 795        argv[argc++] = NULL;
 796
 797        if (run_command_v_opt(argv, RUN_GIT_CMD))
 798                die("git-%s failed", argv[0]);
 799        free(argv);
 800        return 0;
 801}
 802
 803static int push_git(struct discovery *heads, int nr_spec, char **specs)
 804{
 805        struct rpc_state rpc;
 806        int i, err;
 807        struct argv_array args;
 808
 809        argv_array_init(&args);
 810        argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 811                         NULL);
 812
 813        if (options.thin)
 814                argv_array_push(&args, "--thin");
 815        if (options.dry_run)
 816                argv_array_push(&args, "--dry-run");
 817        if (options.verbosity == 0)
 818                argv_array_push(&args, "--quiet");
 819        else if (options.verbosity > 1)
 820                argv_array_push(&args, "--verbose");
 821        argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 822        argv_array_push(&args, url.buf);
 823        for (i = 0; i < nr_spec; i++)
 824                argv_array_push(&args, specs[i]);
 825
 826        memset(&rpc, 0, sizeof(rpc));
 827        rpc.service_name = "git-receive-pack",
 828        rpc.argv = args.argv;
 829
 830        err = rpc_service(&rpc, heads);
 831        if (rpc.result.len)
 832                write_or_die(1, rpc.result.buf, rpc.result.len);
 833        strbuf_release(&rpc.result);
 834        argv_array_clear(&args);
 835        return err;
 836}
 837
 838static int push(int nr_spec, char **specs)
 839{
 840        struct discovery *heads = discover_refs("git-receive-pack", 1);
 841        int ret;
 842
 843        if (heads->proto_git)
 844                ret = push_git(heads, nr_spec, specs);
 845        else
 846                ret = push_dav(nr_spec, specs);
 847        free_discovery(heads);
 848        return ret;
 849}
 850
 851static void parse_push(struct strbuf *buf)
 852{
 853        char **specs = NULL;
 854        int alloc_spec = 0, nr_spec = 0, i, ret;
 855
 856        do {
 857                if (!prefixcmp(buf->buf, "push ")) {
 858                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 859                        specs[nr_spec++] = xstrdup(buf->buf + 5);
 860                }
 861                else
 862                        die("http transport does not support %s", buf->buf);
 863
 864                strbuf_reset(buf);
 865                if (strbuf_getline(buf, stdin, '\n') == EOF)
 866                        goto free_specs;
 867                if (!*buf->buf)
 868                        break;
 869        } while (1);
 870
 871        ret = push(nr_spec, specs);
 872        printf("\n");
 873        fflush(stdout);
 874
 875        if (ret)
 876                exit(128); /* error already reported */
 877
 878 free_specs:
 879        for (i = 0; i < nr_spec; i++)
 880                free(specs[i]);
 881        free(specs);
 882}
 883
 884int main(int argc, const char **argv)
 885{
 886        struct strbuf buf = STRBUF_INIT;
 887        int nongit;
 888
 889        git_extract_argv0_path(argv[0]);
 890        setup_git_directory_gently(&nongit);
 891        if (argc < 2) {
 892                fprintf(stderr, "Remote needed\n");
 893                return 1;
 894        }
 895
 896        options.verbosity = 1;
 897        options.progress = !!isatty(2);
 898        options.thin = 1;
 899
 900        remote = remote_get(argv[1]);
 901
 902        if (argc > 2) {
 903                end_url_with_slash(&url, argv[2]);
 904        } else {
 905                end_url_with_slash(&url, remote->url[0]);
 906        }
 907
 908        http_init(remote, url.buf, 0);
 909
 910        do {
 911                if (strbuf_getline(&buf, stdin, '\n') == EOF) {
 912                        if (ferror(stdin))
 913                                fprintf(stderr, "Error reading command stream\n");
 914                        else
 915                                fprintf(stderr, "Unexpected end of command stream\n");
 916                        return 1;
 917                }
 918                if (buf.len == 0)
 919                        break;
 920                if (!prefixcmp(buf.buf, "fetch ")) {
 921                        if (nongit)
 922                                die("Fetch attempted without a local repo");
 923                        parse_fetch(&buf);
 924
 925                } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
 926                        int for_push = !!strstr(buf.buf + 4, "for-push");
 927                        output_refs(get_refs(for_push));
 928
 929                } else if (!prefixcmp(buf.buf, "push ")) {
 930                        parse_push(&buf);
 931
 932                } else if (!prefixcmp(buf.buf, "option ")) {
 933                        char *name = buf.buf + strlen("option ");
 934                        char *value = strchr(name, ' ');
 935                        int result;
 936
 937                        if (value)
 938                                *value++ = '\0';
 939                        else
 940                                value = "true";
 941
 942                        result = set_option(name, value);
 943                        if (!result)
 944                                printf("ok\n");
 945                        else if (result < 0)
 946                                printf("error invalid value\n");
 947                        else
 948                                printf("unsupported\n");
 949                        fflush(stdout);
 950
 951                } else if (!strcmp(buf.buf, "capabilities")) {
 952                        printf("fetch\n");
 953                        printf("option\n");
 954                        printf("push\n");
 955                        printf("\n");
 956                        fflush(stdout);
 957                } else {
 958                        fprintf(stderr, "Unknown command '%s'\n", buf.buf);
 959                        return 1;
 960                }
 961                strbuf_reset(&buf);
 962        } while (1);
 963
 964        http_cleanup();
 965
 966        return 0;
 967}